WO2007020134A1

WO2007020134A1 - Battery-powered electric-motor kitchen appliance

Info

Publication number: WO2007020134A1
Application number: PCT/EP2006/064097
Authority: WO
Inventors: Darko Ogrizek; Toni Pogacar; Marjan Mak; Aleksander Sedovsek; Uros Semeja
Original assignee: BSH Bosch und Siemens Hausgeräte GmbH
Priority date: 2005-08-17
Filing date: 2006-07-11
Publication date: 2007-02-22
Also published as: EP1917688A1; DE102005038926A1

Abstract

The invention relates to a network-independent electric-motor kitchen appliance (1), in particular, a handheld mixing device, preferably, a hand mixer (2). According to the invention, the kitchen appliance (1) comprises a lithium-ion-battery (6) or a lithium-polymer-battery. The kitchen appliance (1) can be used in a reliable manner over a long period of time and at high electric power levels due to the use of said type of battery.

Description

Battery operated electromotive kitchen appliance

The invention relates to an electromotive kitchen appliance, which is independent of the mains.

From DE 29 04 159 an electrical hand-held device such. an electric knife or a Handrührer known in which an electric motor drive unit is housed in a housing, wherein the drive unit has externally accessible, drivable tool holders, in which working tools can be used detent and re-triggered by means of an adjustable trigger in the housing.

DE 197 34 557 discloses a mains connection low-power home appliance with a solar generator and a buffer accumulator.

DE 42 20 233 A1 discloses a domestic appliance for processing foodstuffs with an electric motor and an accumulator, which can be operated independently of the mains. To charge the battery of the household appliance, the household appliance is coupled to a charging station.

It has been found that known solutions for operating electromotive kitchen appliances independently of the mains are unsuitable for ensuring reliable operation over a sufficiently long period of time. This is the case in particular with electromotive kitchen appliances whose electrical output is comparatively high. In addition to the reliability and a sufficient length of operation, the safety of the kitchen appliance is of central importance. The kitchen appliance must be suitable for everyday use and must not be a source of danger to the user. Many efforts to operate electromotive household appliances with the help of a rechargeable battery power-independent, failed because of the performance of the accumulators used or could not meet the required in the household strict safety standards.

It is therefore an object of the present invention to provide an electromotive kitchen appliance, which works independently of the mains and is reliable and safe in operation. This object is achieved by the electromotive kitchen appliance as specified in the independent claim. Further advantageous embodiments and developments, which can be combined individually or arbitrarily with each other, are the subject of the dependent claims.

The electromotive kitchen appliance according to the invention is independent of the mains and has a lithium ion accumulator or a lithium polymer accumulator.

Off-line means that the kitchen appliance can be operated cordless, i. no power cord is needed during operation. Although lithium-based batteries have been known for some time, they were unsuitable for use in the home, especially in a kitchen, since they posed certain dangers. Excessive charge and / or discharge current can metallic lithium or gas are formed, which can lead to an explosion of the battery. In particular, with batteries large enough to provide over 200W of electrical power, the high energy density of the lithium-ion batteries causes problems, and therefore, the use of lithium-ion batteries in electromotive kitchen appliances has not previously been considered.

The lithium-ion battery is a rechargeable electric battery based on lithium. The battery is distinguished from many other battery variants by a long life, low weight, high performance and a non-existent memory effect. A lithium-ion cell usually has a nominal voltage of 3.6 volts and a charging end voltage of 4.0 volts. The lithium-polymer battery has an even higher energy density.

The energy density of lithium-ion cells is typically about twice that of a standard nickel-cadmium battery. There is also potential for higher energy densities. The load characteristic is quite good, and it behaves similarly to nickel-cadmium batteries in terms of discharge. The high cell voltage of 3.6V allows to build batteries with only one cell. A lithium-ion battery requires little maintenance, an advantage that most other systems can not claim. Since there is no memory effect, a regular charge / discharge cycle is not necessary to extend the life expectancy of the battery. To comes that the self-discharge is less than half of a nickel-cadmium battery. Lithium-ion cells cause only minor damage during disposal.

The lithium-polymer battery differs from conventional batteries in the type of electrolyte used. The lithium polymer accumulator may be a hybrid cell containing gel electrolytes. In the lithium-ion polymer battery, a solid electrolyte replaces the porous separator, and a gel electrolyte may serve to improve the ion conductivity.

The conductivity can be in a range of 2 to 5 mS / cm. The voltages acting on the cell are: rated voltage 3.6 V, open circuit voltage 4.2 V, discharge voltage 3.6 to 3.0 V, final discharge voltage 2.5 V. The operating temperature is between -20 and 55 ^° C., in particular between 16 ⁰ C and 22 ⁰ C, optimally at 18 ⁰ C.

The specific energy is between 90 Wh / kg and 630 Wh / kg, in particular between 150 Wh / kg and 300 Wh / kg. The energy efficiency is 70 to 90%. The energy density is in a range of 200 to 300 Wh / l. The accumulator can be recharged in 2 to 4 hours.

Advantageously, the accumulator has a specific capacity in a range from 50 Ah / kg to 130 Ah / kg, in particular from 60 Ah / kg to 80 Ah / kg. Due to this high specific capacity, i. Amount of storable charges per mass of the accumulator, a long operating time can be achieved independently of a mains connection. For example, it can be achieved by this means that a medium-strength hand blender with its full power can be operated for at least half an hour.

The electromotive kitchen appliance advantageously has a safety deposit, in particular a protective circuit, for the accumulator. By the safety device, the risk of fire or explosion, which emanates from a lithium-ion accumulator system, considerably reduced and indeed such that in practice and in everyday life virtually no danger emanates from the electromotive kitchen appliance. In particular, the safety device can counteract an excessive gas overpressure in the interior of the accumulator, in particular having an overpressure blow-out opening. The safety device can also be a temperature sensor for the - A -

Have accumulator. The temperature of the accumulator can be controlled by means of the safety device and the temperature sensor. By setting the optimum temperature for the accumulator on the one hand optimum typical capacity of the accumulator can be achieved, on the other hand, destruction of the accumulator can be counteracted by excessive temperatures. The cell temperature is advantageously monitored to prevent extreme temperatures. The maximum charge and discharge current is advantageously limited in order to counteract lithium metallization that may occur in the event of overcharging.

Advantageously, an electronic control device is provided which monitors the charging and discharging of the accumulator and optionally limits the charging or discharging current. By limiting the charging or discharging current as well as formation of gas or a formation of metallic lithium in the accumulator is counteracted, whereby the safety of the electromotive kitchen appliance is increased.

The maximum power that can be delivered by the accumulator is advantageously in a range of 200 W to 800 W, in particular in a range of 250 W to 400 W. Such power levels are useful for the operation of the kitchen appliance in a kitchen. However, these power levels require a corresponding dimensioning of the accumulator or a corresponding safety device in order to ensure a reliable and safe operation of the kitchen appliance over a sufficiently long period of time.

The kitchen appliance is designed in particular as a hand mixer, preferably as a hand blender.

In a special embodiment, a charge status indicator for the battery, in particular an LED display, is provided. With the help of the charge status display, a user of the kitchen appliance can easily determine whether the kitchen appliance requires recharging.

Further advantageous details and particular embodiments will be explained in more detail with reference to the following drawing, which does not limit the present invention, but is intended to illustrate only by way of example. They show schematically:

1 shows a kitchen appliance according to the invention, which is designed as a hand blender, in a perspective plan view;

FIG. 2 shows the blender according to FIG. 1 in a perspective exploded view; FIG.

FIG. 3 shows the kitchen appliance according to the invention according to FIG. 1 with a loading station in a perspective oblique view obliquely from above; FIG.

FIG. 4 shows the kitchen appliance and the charging station according to FIG. 3 in a further perspective oblique view from below; FIG.

Figure 5 shows the kitchen appliance according to the invention of Figure 1 in a side view, wherein the kitchen appliance is placed in a charging station, which is shown in cross section ..;

FIG. 6 shows the hand blender according to the invention according to FIG. 2 with an opened housing clamping cover and partially cut edge in a perspective oblique view from the side; FIG.

FIG. 7 shows the blender according to FIG. 6 with the lid closed; FIG.

FIG. 8 shows a charging station according to the invention according to FIG. 4 in a side view with a partially cut open charging station housing; FIG.

9 shows the kitchen appliance and the charging station according to FIG. 3 in a perspective view

Oblique view from diagonally above.

FIG. 1 shows a kitchen appliance 1 according to the invention, which is designed as a hand blender 2. A tool 17 designed as a cutting or purging unit is mounted on the hand blender 2 with the aid of a bayonet closure 72. The tool 17 has a tool head 46 which has corresponding blades or mixing elements (not shown). The hand blender 2 has a housing 5 with a first housing shell 56, a formed as a clamping element 61 housing clamping cover 63 and a second housing shell 57 (see FIG. 2). A charge status indicator 27 indicates whether the stick mixer 2 is ready for operation, in particular whether it is sufficiently charged. With the help of a switch 67 of the stick mixer 2 is put into operation. However, the power switch 67 is effective only when unlocked by a safety switch 69. By separate from the power switch 67 safety switch 69 an electrical lock is effected, which unlocks the power switch 67 only after a time delay after pressing the safety switch 69 and releases. This ensures that the hand blender 2 is not unintentionally put into operation, whereby in particular the safety is increased in a household with children.

FIG. 2 shows a blast mixer 2 according to the invention in a perspective exploded view with a housing 5, which is formed by a first housing shell 56, a second housing shell 57 and a housing clamping cap 63. The housing 5 accommodates a motor 47, a control electronics 51 on a circuit board 78 and an accumulator 6. The motor 47, the board 78 with the control electronics 51 and the accumulator 6 are mounted on a preassembly carrier 48. The motor 47 and the accumulator 6 are attached to the insertable into the housing 5 preassembly carrier 48. The pre-assembly carrier 48 is connected to the housing 5 without glue and unthreaded. For this purpose, the pre-assembly carrier 48 locking elements 49, 74, with which it is fixed to corresponding counter-elements 50 on the housing 5, for example by clipping. The control electronics 51 is clipped by means of first locking means 52. Also, an electrical switch 67, 69, a power switch 67 and a safety switch 69, clipped to the preassembly support 48 by means of second locking means 53. The motor 47 and the accumulator 6 are clipped to the preassembly carrier 48. Due to the pre-assembly capability and the screw-free connectivity of the individual components, the production of the hand blender 2 can be considerably simplified and made less expensive. The two housing shells 56, 57 are connected to each other along a housing groove 58 or housing spring 59 along a first connecting line 64, which is formed by the edges 66 of the two housing shells 56, 57, gap-free. The Gehäuspanndeckel 63 is connected along a second connecting line 65 with the two housing shells 56, 57 substantially gap-free. The Gehäuspanndeckel 63 serves as a clamping element 61, which connects the two housing shells 56, 57 together by means of a fastening means 60. The clamping element 61 engages the first housing shell 56 at least at least two separate attachment points 62 and pushes the first housing shell 56 at the two attachment points 62 against the second housing shell 57. The preassembly support 48 with the motor 47 and the accumulator 6 is supported by means of supports 54 in the housing shells 56, 57 and thus adhesive-free and fixed without screws. Provided on the accumulator 6 is a safety device 7, which counteracts the accumulator 6 against an overpressure, a formation of metallic lithium at the electrodes of the accumulator 6 or a formation of gas in the accumulator 6. In addition, a control device 26 with a temperature sensor 25 ensures that the accumulator 6 is protected from excessive temperature fluctuations, which could result in an impairment of the performance of the accumulator 6 (intermediate or persistent). The control device 26 can regulate the temperature of the accumulator 6 to a temperature range. With the aid of the safety device 7, a maximum charging current or a maximum discharge current is predetermined, whereby the safety of the lithium - ion battery 6 is increased. The circuit board 78 is fastened to the preassembly carrier 48 with the aid of first latching means 52. A switch 67 and a safety switch 69 are clipped on the circuit board 78 with the aid of second latching means 53. The first housing shell 56 has, in the area of the switches 67, 69, a rubber membrane 89 molded with a 2K technique, which protects the switches 67, 69 underneath. The power switch 67 is unlocked by the safety switch 69 by the safety switch 69 is actuated a short moment before the switch 67 on. For this purpose, a time integration circuit 70 is provided, which only allows a release with a delay of 0.3 sec. The safety switch 69 and the time integration circuit 70 form an electronic lock 68 for the blender 2. The state of charge of the accumulator 6 is indicated by means of a charge state indicator 27. The charge status display 27 has an LED display 28 on the PI tine 78, the light is passed through a light guide 73 to the outside. A tool 17 (see Fig. 3) is connected by means of a bayonet closure 72 with the hand blender 2, wherein a rotor 75 of the motor 47 with a shaft 76 (see Fig. 3) of the tool 17 is rotatably connected. The two housing shells 56, 57 are connected to one another at the tool-side end of the hand blender 2 by means of screw fastening means 55. For charging the accumulator 6 two designed as spring elements 22 sliding contacts 10, 1 1, each provided with a grinder 13, 14 have. With the help of the two sliding contacts 10, 1 1 is an electrical coupling 9 for the transmission of electrical energy from a charging station 8 (see Fig. 3) on the Hand blender 2 provided. The two grinders 13, 14 are guided by means of feedthroughs 19 through a wall 29 of the second housing shell 47.

FIG. 3 shows the hand blender 2 according to the invention according to FIG. 2 with a loading station 8 and a tool 17 in a perspective oblique view obliquely from above. The accumulator 6 powered stick mixer 1 and the charging station 8 for the stick mixer 2 for charging the accumulator 6 form a charging system 3, wherein the stick mixer 2 during charging of the accumulator 6 with the charging station 8 via an electrical coupling 9 is connectable. With the aid of the coupling 9, electrical energy is transferred from the charging station 8 to the hand blender 2. The coupling 9 allows a rotation of the blender 2 relative to the charging station 8, so that the blender 2 can be used easily and without accurate alignment of its angle of rotation 12 relative to the charging station 8 in the charging station 8. The coupling 9 has two sliding contacts 10, 1 1 with two grinders 13, 14 and two slip rings 15, 16 and allows a rotation angle 12 by more than 360 °. As a result, a particularly simple coupling of the blender 2 with the charging station 8 is made possible. The slip rings 15, 16 form electrical contact surfaces 33 for producing a galvanic contact of the rechargeable battery 6 in the hand blender 2 with the charging station 8. The charging station 8 is electrically connected to an external power supply (not shown). The charging station 9 forms a holder 4 for the blender 2 and can be fixed with a mounting surface 24 on a wall 30 (see Fig. 5) or placed by means of a stand surface 23 on a surface 31 such as on a kitchen top. The holder 4 has a tool holder 18 for the tool 17, for which the tool holder 18 has a receiving bottom 34 with corrugations 35, which are adapted to the shape of the tool head 46 and its contour 45 such that a secure holding of the tool 17 is ensured if the tool 17 is placed in the tool holder 18. If the holder 4 is fastened to the wall 30 (see FIG. 5), the tool 17 can also be hooked into the tool holder 18 by the tool 17 being inserted through a radial gap 36 of the annular tool holder 18. The charging station 8 has electrical leads 32 that can be connected to an external power supply (not shown). The hand blender 2 and the tool 17 are fixed by means of a bayonet closure 72 by rotation about 120 ° about a longitudinal axis 20. Here, a shaft 76 of the tool 17 coupled to the rotor 75 (see FIG. 2) of the motor 47. The power level of the stick mixer 2 can be adjusted by means of an actuating means 71. In particular, between different Speed or power levels such as 100 W, 200 W and 300 W are selected. The multifunctional holder 4 for the blender 2 and the blender 2 represent an assembly 40 which is particularly advantageous for the use of the blender 2. In particular, the stick mixer 2 can be grasped and used in a simple manner without disturbing the electrical cable. After use, the hand blender 2 can be quickly and easily placed in the charging station 8. With the help of the holder 4, the hand blender 2 can be placed both on a surface 31 and attached to a wall 30 such as a kitchen wall or a cabinet wall.

FIG. 4 shows a hand blender 2 according to the invention with the charging station 8 according to FIG. 3 in a perspective oblique view. The power switch 67 and the safety switch 69 are separated from each other by an effective distance D. Actuating here means that two fingers must have this distance D, so that the two switches can be operated effectively. This ensures that operation of the hand blender 2 can not be triggered by accident or accidentally with a single finger. The loading system 3 has the first slider 13 and the second slider 14, each having a distance from the longitudinal axis 20 corresponding to the radius R1, R2 of a slip ring 15, 16. The two slip rings 15, 16 (see FIG. 3) can be electrically contacted by means of contact legs 77. The holder 4 can be held on a wall 30 by means of a mounting plate 37 (see FIG. 5). The mounting plate 37 is fixed to the holder 4 by means of a mounting plate groove 38. The blender 2 can be easily placed in the loading station 8 due to the 360 "coupling 9, without having to pay any particular attention to the orientation of the blender 2 relative to the storage station 8. By means of guide surfaces 87, with respect to a Verkupplungsrichtung 88, along which kitchen appliance 1 is inserted and coupled into charging station 8, coupling of kitchen appliance 1 with charging station 8 is further facilitated brought to the correct position in the charging station 8.

5 shows the hand blender 2 according to the invention in a side view, wherein the kitchen appliance 1 is placed in a charging station 8, which is shown in cross-section. Here, the electric coupling 9 of the blender 2 with the charging station 8 through the first sliding contact 10 with the first slider 13 and the first slip ring 15 and through the second sliding contact 1 1 with the second slider 14 and the second slip ring 16, made. The two slip rings 15, 16 each have contact legs 77, which can be electrically contacted from below. The two slip rings 15, 16 also have fastening legs 21, which at the loading station 8 a hook and thus secure attachment of the two slip rings 15, 16 produce. The holder 4 can stand with rubber feet 44 on a surface 31 (see Fig. 3). However, it can also be screwed by means of a mounting plate 17, which is fixed by a mounting plate 38 and a mounting plate spring 39 to the holder 4 by means of a screw 33 to a wall 30. The housing 5 of the stick mixer 2 is connected to the two housing shells 56, 57 by means of a housing clamping lid 63 along a second connecting line 65.

FIG. 6 shows the hand blender 2 according to the invention according to FIG. 1 with an opened clamping cover 63 and a partially cut second housing shell 57. The housing clamping cover 63 forms a tensioning element 61, by which the first housing shell 56 is clamped to the second housing shell 57 such that a substantially gap-free connection between the two housing shells 56, 57 along the first connecting line 64 is produced. For this purpose, the housing clamping cover 63 engages with the aid of a fourth connecting element 64 in a corresponding receptacle on the first housing shell 56, and a first connecting element 79 and a second connecting element 80 with respective connecting projections 82 engage behind at two separate connection points 62 into corresponding separate connection receptacles 83 The fourth connecting element 84 engages in a lid receptacle 46 on the first housing shell 56. If the housing clamping cap 63 is connected to the second housing shell 57 with the aid of a third connecting element 81 and a screw connection 85, the respective projections 82 press the first housing shell 56 on the two separate In this way, a gap-free connection of the two housing shells 56, 57 is also accomplished if manufacturing tolerances along the first connecting line 64 (eg inaccuracies on the housing groove 58 or d he housing spring 59 of the housing shells 56, 57) complicate the locking of the two housing shells 56, 57.

Fig. 7 shows the blender according to the invention 2 of FIG. 6 with closed housing clamping cover 63 in a perspective side view with a partial cut Second housing shell 57. It can be seen that the connecting projection 82, the connection receptacle 83 engages behind and compressed in the sequence, the two edges 66 of the housing shells 56, 57 at the two attachment points 62.

Fig. 8 shows the charging station 8 designed as a holder 4, which is partially cut from the side with the tool holder 18. The holder 4 has rubber feet 44 on its base 23. The holder can be fixed to a wall 30 (see FIG. 5) by means of the mounting plate 37. Serve this purpose first 41 and second 42 slots, with which a simple screw on the wall 30 can be made. The slots 41, 42 allow alignment of the mounting plate 37 in the vertical and horizontal directions and thus allow a particularly simple attachment of the holder 4 to the wall 30th

9 shows the hand blender 2 according to the invention with the holder 4 designed as a charging station 8 in a perspective oblique view. Evident are formed on the loading station 8 slip rings 15, 16, which are fixed by means of fastening legs, which barbs (not shown) may be attached to the holder 4. The tool holder 18 has corrugations 15 which are adapted to the contour 45 of the tool 17 such that the tool 17 is securely in the tool holder 18. With the aid of the radial gap 36, the tool 17 can be suspended in the tool holder 18.

In the following, various other aspects related to the invention will be described. The individual aspects can each be applied individually, i. independently of each other, or combined with each other as desired:

A particularly advantageous electromotive kitchen appliance 1, which is independent of the mains, has a lithium ion accumulator 6 or a lithium polymer accumulator. The accumulator 6 may have a specific capacity in a range of 50 Ah / kg to 130 Ah / kg, more preferably 60 Ah / kg to 80 Ah / kg. In particular, a safety device 7, in particular a protective circuit, is provided for the accumulator 6, with the safety device 7 advantageously counteracting excessive overpressure and, in particular, having an overpressure blow-out opening for this purpose. The safety device 7 can also comprise a temperature sensor 20 for the accumulator 6. point. The safety device can regulate the temperature of the accumulator 6. Advantageously, an electronic control device 26 is provided which monitors the charging and discharging of the accumulator 6 and optionally limits the charging or discharging current. The deliverable maximum power from the accumulator 6 is in particular in a range of 200 W to 800 W, in particular in a range of 250 W to 400 W. The kitchen appliance 1 is in particular as a hand mixer, preferably as a hand blender 2, configured. In a special embodiment, a state of charge indicator 27 for the accumulator 6, in particular an LED display 28, is provided.

A preferred charging system 3 comprises a kitchen appliance 1 operated by an accumulator 6, in particular a hand blender 2, and a charging station 8 for the kitchen appliance 1 for charging the rechargeable battery 6, the kitchen appliance 1 being charged with the charging station 8 by means of a recharging station 8 for recharging the rechargeable battery 6 Clutch 9 is connectable to transfer electrical energy from the charging station 8 on the kitchen appliance 1, wherein the coupling 9 allows rotation of the kitchen appliance 1 relative to the charging station 8. The coupling 9 preferably permits a rotation, in particular about the vertical, by a rotation angle 12 of more than 90 °, in particular more than 180 °, preferably by more than 360 °. In a specific embodiment, the coupling 9 at least two sliding contacts 10, 1 1 with two grinders 13, 14 and two slip rings 15, 16, wherein the two slip rings 15, 16 may be arranged concentrically and may have different radii R1, R2 or the two Slip rings 15, 16 may be arranged coaxially offset. The two slip rings 15, 16 are advantageously attached to the charging station 8. To avoid electrolytic corrosion by liquid splashes on the charging station, the two slip rings 15, 16 may be attached to the kitchen appliance 1. Advantageously, the kitchen appliance 1 a tool holder 18 for a tool 17 and the sliding contacts 10, 1 1 for the coupling 9 of the kitchen appliance 1 are arranged with the charging station 8 on or in the tool holder 18 that the sliding contacts 10, 1 1 am Kitchen appliance 1 are covered by the tool 17 on the kitchen appliance 1 during use of the kitchen appliance 1. The slip rings 15, 16 are punched in particular from a sheet. A slip ring 15, 16 advantageously has at least one contact leg 77 which is angled away from a plane formed by the slip ring 15, 16 and projects through a bushing 19 in a wall 29 on the kitchen appliance 1 or on the charging station 8. A slip ring 15, 16 may comprise at least two, preferably at least four, in particular to form a through the slip ring 15, 16 th angled plane, have fastening legs 21, with which the slip ring 15,

16 attached, in particular clipped or hooked is. The charging station 8 is advantageously produced by injection molding. The grinders 13, 14 are advantageously designed as spring elements 22 and are based in the coupled state of the kitchen appliance 1 and the loading station 8 resiliently on the slip rings 15, 16 from. Slanted and / or curved guide surfaces 87 on the kitchen appliance 1 and / or on the charging station 8 are advantageously provided with respect to a coupling direction 88 for easier connection of the kitchen appliance to the charging station. The charging station 8 used is suitable and intended for use with the charging system.

A particularly advantageous multifunctional holder 4 for a blender 2 comprises a base 23, with which the holder 4 can be placed on a horizontally flat surface 31, and a mounting surface 24, with which the holder 4 can be fastened to a wall 30. It advantageously provides a first tool holder 18 for holding a tool 17, in particular a stirring and / or blending plant. The holder 4 has in particular electrical lines 32 and advantageously forms a charging station 8 for a battery 6 powered blender 2. The holder 4 may be electrical contact surfaces 33, in particular slip rings 15, 16 and / or grinder 13, 14, for electrical contacting of the accumulator 6 operated Stabmixers 2 have. Advantageously, the tool holder 18 is such that the tool 17 can be placed in the tool holder 18 in, so that in particular the tool 17 is located substantially above the tool holder 18. Alternatively or additionally, the tool holder 18 may be such that the tool

17 can be suspended in the tool holder 18, so that in particular the tool 17 is located substantially below the tool holder 18. In a special embodiment, the tool holder 18 has a receiving base 34 which is corrugated and in particular has at least four, advantageously at least five, corrugations 35. The tool holder 18 may be annular, wherein advantageously the annular tool holder 18 has a substantially radial gap 36 with which the tool 17 can be pushed into the annular tool holder 18. The mounting surface 24 is advantageously formed as a releasably attachable to the holder 4 mounting plate 37. The mounting plate 37 may be configured so that it can be clipped to the holder 4. The mounting plate 37 can in particular by means of a mounting plate 38 and mounting plate spring 39 on the holder 4 are inserted and fixed. It is advantageous if the mounting plate 37 has at least one first slot 41 for attachment to a screw 43 on a wall 3. It is also advantageous if a second slot 42 is provided for attachment of the holder 4 with a screw 43 on a wall 3, which is in particular perpendicular to the first slot 41. A further embodiment provides that rubber feet 44 are provided on the base 23.

A particularly advantageous arrangement comprises the advantageous holder and a stick blender 2, which is held by the holder 4. The arrangement may further comprise a tool 17 for the hand blender 2, in particular a stirring and / or blending plant, wherein the tool 17 is held by means of a tool holder 18 of the holder 4. It is advantageous if the tool holder 18 is shaped according to the contour 45 of a tool head 46.

A particularly advantageous hand blender 2 comprises a housing 5 and a motor 47 located therein and an accumulator 6 located therein, and provides that the motor 47 and the accumulator 6 are fastened to a preassembly carrier 48 which can be inserted into the housing 5 the housing 5 is fixed. In an advantageous embodiment, it is provided that the pre-assembly carrier 48 is adhesively-free and / or unscrewed connected to the housing 5. In an advantageous embodiment, it is provided that the pre-assembly carrier 48 has latching elements 49, 74, with which it is fixed to corresponding counter-elements 50 on the housing 5, in particular clipped, is. In an advantageous embodiment, it is provided that an electronic control unit 51 attached to the pre-assembly support 48, in particular clipped by means of first locking means 52, is. In an advantageous embodiment, it is provided that electrical switch 67, 69, in particular a power switch 67, attached to the preassembly support 48, preferably clipped by means of second locking means 53, is. In an advantageous embodiment, it is provided that the motor 47 and / or the accumulator 6 is clipped onto the pre-assembly carrier 48. In an advantageous embodiment, it is provided that the pre-assembly carrier 48 is made of plastic, in particular by injection molding. In an advantageous embodiment, it is provided that the pre-assembly carrier 48 is held in the housing 5 by means of supports 54, in particular supporting ribs. In an advantageous embodiment, provision is made for the housing 5 to have two housing shells 56, 57 which can be assembled and which in particular can be assembled by means of a housing groove 58 or housing body. 59 are connectable gap-free. In an advantageous embodiment, it is provided that the pre-assembly carrier 48 is molded from plastic, in particular by injection molding.

A particularly advantageous pre-assembly carrier 48 is suitable and intended for the advantageous stick mixer 2.

A particularly advantageous method for producing a stick blender 2 with a housing, a motor 47 located therein and an accumulator 6 therein, comprises the following method steps: preassembly of the motor 47 and the accumulator 6 on a preassembly carrier 48; Introducing the pre-assembly carrier 48 with motor 47 and accumulator 6 in the housing 5; Closing the housing 5. In an advantageous embodiment, it is provided that the motor 47 and the accumulator 6 can be clipped onto the pre-assembly carrier 48. In an advantageous embodiment, it is provided that the pre-assembly carrier 48 can be clipped onto the housing 5.

A particularly advantageous hand-held kitchen appliance 1, in particular hand blender 2, with a housing 5 comprises at least a first 56 and a second housing shell 57 and a fastening means 60 for connecting the two housing shells 56, 57 with each other, and provides that the fastening means 60 a Clamping element 61 which engages the first housing shell 56 at least two separate attachment points 62 and presses the first housing shell 56 at the two attachment points 62 against the second housing shell 57. In an advantageous embodiment, it is provided that the clamping element 61 is formed by a, in particular by the housing shells 56, 57 separate, housing clamping cover 63 which is connected gap-free with the two housing shells 56, 57 along a second connecting line 65. In an advantageous embodiment, it is provided that the clamping cover 63 clamps the two housing shells 56, 57 together. In an advantageous embodiment, it is provided that the clamping element 61 has at least a first 79, a second 80 and a third 81 connecting element, wherein the clamping element 61 with the first 79 and second 80 connecting element on the first housing shell 56 and with the third connecting element 81 is attached to the second housing shell 57. In a special development, it is provided that the first 79 and second 80 connecting element is formed by a connecting projection 82 which engages in a connection receptacle 83 on the respective housing shell 56, 57. In an advantageous embodiment, provision is made for see that the third connection element 82 produces a screw connection 85. In an advantageous embodiment, it is provided that a fourth connecting element 84 is provided on the clamping element 61, with which the clamping element 61 is attached to the first 56 or second 57 housing shell. In an advantageous embodiment, it is provided that the two housing shells 56, 57 can be connected to one another at a first connecting line 64 formed along their edges 66 by means of a housing groove and housing spring. In an advantageous embodiment, it is provided that the housing shells 56, 57 have clip elements with which the housing shells 56, 57 can be connected to one another. In an advantageous embodiment, it is provided that the kitchen appliance 1 is electromotive, in particular a hand blender 2. In an advantageous embodiment, it is provided that the housing shells 56, 57 are essentially designed as half shells. In an advantageous embodiment, it is provided that the two attachment points 62 at least 2 cm, in particular at least 3 cm, preferably at least 4 cm, are spaced from each other.

A particularly advantageous method for producing a kitchen appliance 1, in particular hand blender 2, which has a first 56 and a second housing shell 57 and a housing clamping cover 63, so that a substantially closed housing 5 is formed by the housing shells 56, 57 and the housing clamping cover 63, provides the following method steps: assembling the two housing shells 56, 57 along a first connecting line 64 formed by the edges 66 of the housing shells 56, 57; engaging the housing lock cover 63 with at least two separate attachment locations 62 on the first housing shell 56; Pressing the two housing shells 56, 57 by means of the housing clamping cover 63 in such a way that the first housing shell 56 is pressed against the second housing shell 57 at the two fastening points 62.

A particularly advantageous electromotive kitchen appliance 1, in particular an electromotive hand-held appliance, preferably a hand blender 2, with a power switch 67 provides that a finger-operated electrical lock 68 is provided for the power switch 67. It is hot to the touch that the latch is suitable and intended to be unlocked manually by a finger. In an advantageous embodiment, it is provided that the lock 68 has a separate from the power switch 67 safety switch 69. In an advantageous embodiment, it is provided that a actuation effective distance D between the power switch 67 and the safety switch 69 at least 0.5 cm, in particular at least 0.8 cm, preferably at least 1, 2 cm, is, and in particular less than 4 cm, in particular less than 3 cm, preferably less than 2.5 cm, is. In an advantageous embodiment it is provided that the lock 68 has a time integration circuit 70, with which the power switch 67 is unlocked only after a time delay after pressing the safety switch 69. In an advantageous embodiment, it is provided that the time delay of the time integration circuit 70 has a duration of at least 0.1 s, in particular at least 0.2 s, preferably at least 0.3 s. In an advantageous embodiment, it is provided that the lock 68 has a time integration circuit 70, with which the power switch 67 is unlocked only after a time delay after pressing the safety switch 69 for a predetermined time window. In an advantageous embodiment, it is provided that the duration of the time window lies in a range of 0.3 s to 2 s, in particular in a range of 0.5 to 1 s. In an advantageous embodiment, it is provided that a further electrical actuating means 71, in particular an electrical step switch, is provided for setting an electrical power level of the kitchen appliance 1, wherein the actuating means 71 in particular on, in particular together and in conjunction with the, power switch 67 is provided. In an advantageous embodiment, it is provided that the safety switch 69 only remains switched on, as long as it is actuated, in particular pressed, is, and otherwise off again.

A particularly advantageous method for switching on a kitchen appliance 1, in particular electromotive hand-held device, preferably hand blender 2, which has a power switch 67 and a separate safety switch 69, wherein the power switch 67 is unlocked when a safety switch 69 is actuated, provides that the safety switch 69 electronically switched. In an advantageous embodiment, it is provided that the power switch 67 is unlocked when the power switch 67 is actuated only after pressing the safety switch 69, in particular time-delayed by a duration of at least 0.1 s, in particular at least 0.2 s, preferably at least 0.3 s. In an advantageous embodiment, it is provided that the unlocking only for the duration of a predetermined time window in a range of 0.3 s to 2 s, in particular in a range of 0.5 s to 1 s, is effective. In an advantageous embodiment, it is provided that the power switch 67 can only be unlocked during the holding of the safety switch 69. In an advantageous embodiment it is provided that the power switch 67 remains switched on after unlocking even when the safety switch 69 is no longer held.

The invention relates to a mains-independent electromotive kitchen appliance 1, in particular a hand mixer, preferably a hand blender 2 and provides that the kitchen appliance 1 comprises a lithium-ion battery 6 or a lithium-polymer battery. By using such a battery type, reliable operation of the kitchen appliance 1 over a long period of time can be ensured even at high electric power levels.

LIST OF REFERENCE NUMBERS

1 kitchen appliance

2 hand blenders

3 charging system

4 holders

5 housing

6 accumulator

7 safety device

8 charging station

9 clutch

10 first sliding contact

11 second sliding contact

12 rotation angle

13 first grinder

14 second grinder

15 first slip ring

16 second slip ring

17 tool

18 tool holder

19 implementation

20 longitudinal axis

21 attachment legs

22 spring elements

23 floor space

24 mounting surface

25 temperature sensor

26 control device

27 charge status indicator

28 LED display

29 wall

30 wall

31 surface

32 electrical lines 33 contact surfaces

34 receiving floor

35 corrugations

36 radial gap

37 mounting plate

38 mounting plate groove

39 mounting plate spring

40 arrangement

41 first slot

42 second slot

43 screw

44 rubber feet

45 contour

46 Tool head

47 engine

48 pre-assembly carrier

49 locking elements

50 counter elements

51 control electronics

52 first locking means

53 second locking means

54 supports

55 Screw fasteners

56 first housing shell

57 second housing shell

58 housing groove

59 housing spring

60 fasteners

61 clamping element

62 attachment points

63 housing clamping cover

64 first connection line

65 second connecting line

66 edges 67 power switch

68 electrical interlock

69 safety switch

70 time integration circuit

71 actuating means

72 bayonet lock

73 optical fiber

74 locking element

75 rotor

76 wave

77 contact leg

78 board

79 first connecting element

80 second connecting element

81 third connecting element

82 connection projection

83 Connection recording

84 fourth connecting element

85 screw connection

86 lid holder

87 guide surface

88 Coupling direction

89 rubber membrane

D operation effective distance

R1 radius of the first slip ring 15

R2 radius of the second slip ring 16

Claims

claims

1 . Electric motor kitchen appliance (1), which is independent of the mains, characterized in that the kitchen appliance (1) has a lithium-ion battery (6) or a lithium-polymer battery.

2. kitchen appliance (1) according to claim 1, characterized in that the accumulator (6) has a specific capacity in a range of 50 Ah / kg to 130 Ah / kg, in particular from 60 Ah / kg to 80 Ah / kg.

3. kitchen appliance (1) according to claim 1 or 2, characterized by a safety device (7), in particular a protective circuit, for the accumulator (6).

4. kitchen appliance (1) according to claim 3, characterized in that the safety device (7) counteracts an excessive overpressure, in particular having an overpressure blow-out.

5. kitchen appliance (1) according to claim 3 or 4, characterized in that the safety device (7) has a temperature sensor (20) for the accumulator (6), and in particular the temperature of the accumulator (6) controls.

6. kitchen appliance (1) according to one of the preceding claims, characterized in that an electronic control device (26) is provided which monitors the charging and discharging of the accumulator (6) and optionally limits the charging or discharging current.

7. kitchen appliance (1) according to any one of the preceding claims, characterized in that the accumulator from the (6) deliverable maximum power in a range of 200 W to 800 W, in particular in a range of 250 W to 400 W, is located.

8. kitchen appliance (1) according to one of the preceding claims, characterized in that the kitchen appliance (1) as a hand mixer, in particular hand blender (2), is configured.

9. kitchen appliance (1) according to one of the preceding claims, characterized in that a state of charge indicator (27) for the accumulator (6), in particular an LED display (28), is provided.