DE3313977A1 - Bioelectrical electrode arrangement - Google Patents

Abstract

The bioelectrical electrode arrangement comprises an electrode body (25) made of a metal and/or a material which contains carbon and conducts electrons, and, on one face of the electrode body (25), an ion-conducting contact electrolyte layer (29) intended for resting on the skin. The contact electrolyte layer contains a salt, which forms iodine ions, of a metal contained at least in the regions of the electrode body (25) adjacent to the contact electrolyte layer (29). The contact electrolyte layer (29) and at least the regions of the electrode body (25) adjacent to the contact electrolyte layer (29) may alternatively jointly contain substances which form iodine ions. The substances which form iodine ions are preferably iodides. Expediently, the electrode body (25) is composed of two electrode layers (33, 35) which are situated opposite one another in sheet form, separated from one another by an ion-conducting electrolyte interlayer (37) and are made of a metal- and/or plastic-containing material which conducts electrons. The first electrode layer (35) is connected to an electrical supply conductor (27) and the second electrode layer (33) supports the contact electrolyte layer (29) intended for resting on the skin on its face remote from the first electrode layer (35). The electrode layers (33, 35) preferably contain the same metal as the main constituent. The electrolyte layers preferably contain as... <IMAGE>

Description

Bioelectric electrode assembly

The invention relates to a bioelectrical electrode arrangement, with one that can be connected to a metallic lead Electrode body and a metal and / or carbon-containing, electron-conductive material and a Ion-conducting contact electrolyte layer intended to be placed on the skin on a surface of the electrode body .

Bioelectric skin contact electrode assemblies of this type TO are known, for example from US Pat. No. 3,976,055 and 3 993 049 and Medical Electronics October 1978, pages 65 to 67. They are used to measure biological potentials, for example in the fields of electrical

cardiography, electroencephalography, etc. Their function is based on electrochemical reactions at the interfaces the skin and an electrolyte on the one hand and the electrolyte and the electron-conducting material on the other.

on the other hand. The materials that make up the electrode body and the electrolyte consists are chosen so that the electrochemical reactions take place reversibly. One known electrode uses silver as the electrode material, which is coated with silver chloride on its surface is. An NaCl gel is used as the electrolyte.

The interface areas of the electrodes act as electrochemical Half-cells. This has the consequence that conventional electrode arrangements the bioelectrical signal during operation Superimpose considerable DC interference voltages (offset voltages). External, electrical compensation measures are difficult because the interference voltages are multiple fluctuate greatly. External voltages applied to the electrode arrangement cause charge separations and accordingly high interference voltages that only subside after a relatively long recovery time.

Electrolytes used in conventional electrode arrangements lead to artifact voltages that fluctuate as a function of movement. The electrolytes used can also cause skin irritation.

The object of the invention is to provide a bioelectrical electrode arrangement indicate that no or almost no DC interference voltage is superimposed on the bioelectrical signal. The electrode arrangement should also be skin-friendly and not cause skin irritation.

This object is achieved according to the invention on the basis of the bioelectric electrode arrangement explained at the beginning solved that the contact electrolyte layer and at least the areas adjoining the contact electrolyte layer of the electrode body contain iodine ion-forming substances and / or that the contact electrolyte layer contains an iodine ion forming salt of at least one in the contact electrolyte layer adjacent areas of the electrode

ORIG1NAL INSPECTED BAD ORIGINAL

-4S- contains metal contained in the body.

The iodine-containing substances in the contact electrolyte layer have a disinfecting effect on the skin. the special formation of the interface areas ensures low offset DC voltages.

In a preferred embodiment that also applies to others Electrode systems can be used as the above electrode arrangement, it is provided that the electrode body two flat opposite one another, through an ion-conducting electrolyte intermediate layer has separate electrode layers made of metal and / or carbon-containing, electron-conducting material, wherein the first electrode layer can be connected to the lead and the second electrode layer on its the surface facing away from the first electrode layer is the contact electrolyte layer intended to be placed on the skin wearing. The electrolyte intermediate layer, which preferably contains a substance which also forms an iodine ion and expediently has the same quantitative but at least qualitative composition as the contact electrolyte layer, causes a considerable reduction in the DC interference voltages of the electrode arrangement. In addition, will Fluctuations in the interference DC voltage are reduced. Furthermore, electrode arrangements of this type are relatively small AC impedance and also the recovery time, for example after a simulated defibrillation with such Electrodes is relatively small.

The electrode layers preferably each contain the same metal, for example silver, zinc or copper. Metals with an atomic weight of at least 51 are generally suitable. The intermediate electrolyte layer preferably contains a salt of this metal and in particular a salt of this metal which forms iodine ions. Bioelectric In this way, currents can reversibly form metal ions

ORIGINAL INSPECTED COPY

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move between the two electrode layers and also between the second electrode layer and the two Electrolyte layers can shift iodine ions in both directions. This leads to extraordinary low and little fluctuating offset DC voltages.

The electrolyte intermediate layer and the contact electrolyte layer can have a liquid or gel-like consistency. Carrier materials, For example, absorbent paper or fleece or the like can be used. Preferably the Electrolyte layers, in particular the contact electrolyte layer in solid form. For this purpose, the components of the electrolyte layers are mixed in powder form and pressed or sintered under high pressure. The use of solid electrolysis makes the handling of the Electrode arrangement.

Suitable materials for substances which form iodine ions are, for example, iodides, in particular iodides in the electrode layers used metals or formyl triiodide (CHJo). To reduce the polarization of the electrode arrangement The electrolyte layers can also contain germanium or the tungstate used in the electrode layers Metal can be added.

To reduce the contact resistance at the interfaces, the electrode layers can contain salts of the in the electrode. The layers of metal used may be added. Iodides and selenides of this metal are particularly suitable.

For the quantitative composition of the electrode layers and the electrolyte layers, it should be noted that the metal, for example silver, in the electrode layers Zinc or copper make up the largest proportion by weight, while the iodine ions in the electrolyte layers bildondo SubsLaiv /. Don <jowi.chLr.äßi cj delivers the largest share.

ORIGINAL INSPECTED

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The principle explained above of an electrolyte intermediate layer arranged between two electrode layers Can be used not only with a solid contact electrolyte layer, but also with gel-like contact electrolytes, as far as this electrolyte forms iodine ions.

Another embodiment is based on an electrode body, which contains carbon in graphite form or as black carbon as an electron-conducting component. The carbon can be mixed with a plastic, for example epoxy resin, poured into the mold. Conventional Electrode bodies of this type also show high offset DC voltages. The offset DC voltage can according to the invention can also be considerably reduced if the carbon contains an iodine-releasing substance, in particular formyl triiodide (CHJ ^) is added. Suitable are also metal iodides or iodiacetate "I (CH ^ -COO) -. or Iodine perchlorate. As a contact electrolyte layer is suitable an iodide, for example zinc iodide or copper iodide in gel form or in solid form. Potassium iodide are also suitable or calcium iodide.

In the following, exemplary embodiments of the invention will be explained in more detail with reference to a drawing. It shows

5 Fig. 1 shows a first embodiment of an electrode arrangement to be used in connection with an electrolyte gel ;

2 shows a second embodiment of an electrode arrangement with a solid contact electrolyte layer;

3 shows a third embodiment of an electrode arrangement to be used in connection with a contact electrolyte gel, and FIG
35

4 shows an electrode arrangement with a carbon electrode body.

ORIGINAL INSPECTED

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The electrode arrangement in FIG. 1 comprises an insulating plastic housing 1 which, in an opening 3, has a Metal plate 5 encloses. The metal plate 5 is made of zinc. On the opposite of the connection button 7 On the side, the metal plate 5 rests against a solid electrolyte layer 9. The solid electrolyte layer 9 consists of a zinc iodide plate made from powdered zinc iodide was pressed or sintered and is pressed together with the metal plate 5. The metal plate 5 facing away Side of the solid electrolyte layer 9 forms the skin contact side of the electrode and is also in operation with one Zinc iodide containing electrolyte gel 11 coated. The metal plate 5 can also be made of silver or instead of zinc There are copper, the electrolyte layer 9 is then made of silver iodide or copper iodide. As a contact gel 11 is expediently qel-shaped silver iodide, potassium or Copper iodide used. The connection button 7 protrudes from a contact plate 13, which is flat on that of the solid electrolyte layer 9 facing away from the surface of the metal plate 5 rests.

A heat-weldable surface 15 covers the contact plate 13 and the adjoining areas of the housing 1.

Fig. 2 shows another embodiment of a bioelectrical Electrode arrangement with a housing 21 made of insulating plastic, which in a recess 23 a generally with 25 designated electrode body receives. The electrode body has one on one side metallic connection button 27 for connecting the measuring device measuring the bioelectrical signals, for example an electrocardiograph. The electrode body lies on its side opposite the connection button 27 flat on an electrolyte layer 29 made of solid electrolyte material, which will be explained in more detail below. The dem Electrode body 25 facing away from surface 31 of the electrolyte layer 29 is freely accessible and is to rest on the Skin determined. The electrode body 25 comprises two electrode layers · 33 and 35, which are connected by a further electrode

ORIGINAL INSPECTED BAD ORIGINAL

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Lytschicht 37 from each other also made of solid electrolyte material are separated. The electrode layers 33, 35 lie flat against the electrolyte layer 37. The electrode layer 33 connects the electrolyte layers 29 and 37 to one another. The electrolyte layer 37 lies flat a connection plate 39 of the connection button 27. A heat-weldable film 41 covers the connection plate 39 as well as the adjoining areas of the housing 21.

The electrode layers 33 and 35 consist predominantly of metal, the ions explained below Additives forming this metal can be added. The electrolyte layers 29 and 37 consist for the most part from an iodine ion-forming salt of this metal, in particular the iodide of the metal, and can also use other Supplements included. Both electrolyte layers 29, 37 are pressed or made from powdery, solid starting materials sintered and pressed with the electrode layers 33, 35.

Suitable examples of compositions of the electrode layers and the electrolyte layers are:

Example 1: Electrolyte layers 29, 37:

Silver iodide 62.7 percent by weight Silver tungstate 19.8 percent by weight

Germanium 17.5 percent by weight

Electrode layer 35:
Silver 50 weight percent silver iodide 50 weight percent

Electrode layer 33:
Silver 82.3 percent by weight ^ Silver selenide 17.7 percent by weight 35

Example 2: Electrolyte layers 2 9, 37:

Silver iodide 69 percent by weight

· ■ · ■ - ■■ ·. · ■ ORIGINALINSPECTED GOP \

Silver tungstate 10 percent by weight

Germanium 10 percent by weight

Formyl triiodide (iodoform) 11 percent by weight

Electrode layer 35:

Silver 100 percent by weight

Electrode layer 33: silver 100 percent by weight 10

Example 3: Electrolyte layers 29, 37:

Silver iodide 100 percent by weight

Electrode layer 35: silver 100 percent by weight

Electrode layer 33: silver 100 percent by weight

Example 4: Electrolyte layers 29, 37:

Silver iodide 80 percent by weight, silver tungstate 20 percent by weight

Electrode layer 35: silver 80 percent by weight

Formyl triiodide (iodoform) 20 percent by weight

Electrode layer 33: silver 90 percent by weight

Silver selenide 10 percent by weight

Example 5: Electrolyte layers 29, 3 * 7:

Zinc iodide 66 percent by weight Zinc tungstate 19 percent by weight

Germanium 15 percent by weight

ORIGINAL INSPECTED _COpY

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Electrode layer 35:
Zinc 60 percent by weight zinc iodide 40 percent by weight

Electrode layer 33:

Zinc 88 percent by weight zinc selenide 12 percent by weight

Example 6: Electrolyte layers 2 9, 35: Zinc iodide 100 percent by weight

Electrode layer 35: zinc 100 percent by weight

Electrode layer 33:

Zinc 100 percent by weight

In Examples 1, 4 and 5, the electrode layers 33, 35 different composition. Although the order described is preferred, the order may of the electrode layers 33, 35 can also be interchanged.

Fig. 3 shows a further embodiment of a bioelectrical Electrode arrangement, which is characterized by its simple and inexpensive structure. The electrode arrangement in turn comprises a housing 51 made of insulating material, which in an opening 5 3 generally has a 55 designated electrode body receives. The electrode body rests on one of its intended to be applied to the skin Page 57 free and is for operation on this side with an electrolyte layer 5 9 made of an example coated gel-like contact electrolyte. The electrode body 55 is on the opposite side with a contact element 60 designed as a bent part for connecting a plug of the bioelectrical Signals measuring measuring device contacted. The contact element 60 comprises a sleeve-shaped bent from a sheet metal strip

ORIGINALINSPECTED COPY

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shaped socket part 61 which protrudes from the housing 51 and into which the plug of the measuring device is plugged. From the socket part are in a plane away from each other extending legs 63 which are angled from the socket part 61 about axially parallel edges. The thigh lie flat on the electrode body 55. The electrode body 55 comprises two spaced apart Electrode layers 65, 67 which are separated from one another by an electrolyte layer 69. The electrolyte layer 69 comprises a not shown, non-conductive carrier layer, for example paper or Plastic fleece or the like in which the actual ion-conducting electrolyte material is embedded.

In the exemplary embodiment shown, the electrode layers exist 65, 67 made of a metal, preferably zinc, and the electrolyte material consists of an iodine ion donating salt of this metal, preferably iodide. In the exemplary embodiment in FIG. 3, there is electrolyte-0 zinc iodide material. In an analogous manner, the electrode material Silver or copper or the like can be used, with silver iodide as the electrolyte material or copper iodide is used. That the electrolyte layer 5 9 forming gel also contains the iodide of the electrode material, i.e. zinc iodide or silver iodide or Copper iodide or potassium iodide or calcium iodide.

For the production of the electrode body 55, the carrier layer is coated with a solution of the electrolyte material, in particular zinc iodide, impregnated and the carrier material dried. Then both sides of the carrier material are coated with a liquid zinc suspension. The zinc suspension forms the electrode layers after drying The electrode body 55 is inserted together with the connection element 60 in the housing 51 and by means of a the legs 63 and the adjacent areas of the housing 51 covering, heat-weldable film 71 on the body

ORIGINAL INSPECTED ^C0PY

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housing 51 attached. The film 71 can, as well as with the shape of the electrode arrangements explained above, extend around the housing 51 and reach into the contact surface of the electrode body 55, so that the side surfaces of the electrode body are also sealed.

The materials mentioned in the examples of the electrode arrangement in FIG. 2 for the electrode layers and the Electrolyte layers can also be used in the electrode arrangement of FIG. 3. The electrolyte materials these examples can be suspended in gel-like basic substances. It can also be used to produce more solid Electrolytes, a carrier material can be used in which the electrolyte materials are stored.

Fig. 4 shows a further embodiment of a bioelectric electrode arrangement with a substantially disk-shaped electrode body 81, which on his 0 a disk surface, for example, designed as a connection button connection element 83 for the connection of a the device that measures the bioelectrical signals and the other intended for contact with the skin Side surface 85, at least during operation, an electrolyte layer 87, for example made of a gel-like electrolyte material wearing. The electrode body 81 is made of graphite or electrically conductive black carbon, the substance that emits iodine ions, preferably formyl triiodide CHJ-, blended or mixed to form a

* 30 bodies pressure-sintered or in epoxy resin according to the Shape of the electrode body 81 is cast. The electrolyte layer 87 also contains iodine ion-forming material, in particular an iodide, for example zinc iodide, silver iodide, copper iodide, potassium iodide or calcium iodide.

The connection element 83 consists of a metal part, but preferably of a carbon molded part, which of a heat-weldable foil 89 on the electrical

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the body 81 is held. Alternatively, it can consist of the electrically conductive material of the electrode body 81 and be integrally formed on this.

To produce the electrode body 81, the following composition is preferably assumed:

50 percent by weight graphite

17 weight percent iodine charcoal

8 percent by weight formyl triiodide (iodoform)

17 weight percent epoxy resin base

8 percent by weight epoxy resin hardener

Part of the epoxy resin can be replaced with carbon fibers to improve strength. When used Iodine charcoal is granular activated charcoal with an elemental content of, for example, 5 to 6 percent by weight Iodine.

If the electrode body 81 is designed as a pressure-sintered molded part, it can also be used for improvement its mechanical strength and its conductivity Contains carbon fibers. In the above composition, a binder can be used instead of the epoxy resin can be used, the weight fraction of which can be selected differently. '

The mixture of graphite, iodine and formyl triiodide can also be dissolved and / or suspended in a lacquer-like binder, which is applied to a surface of a conductive, preferably in turn made of carbon connecting part applied in layers and then dried will.

ORIGINAL INSPECTED °° ^ΡΥ

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Claims (37)

Claims Bioelectrode arrangement with an electrode body (5; 25; 55; 81) which can be connected to a metal lead and is made of an electron-conductive material containing metal and / or carbon and an ion-conductive material intended to be placed on the skin
Contact electrolyte layer (11; 29; 59; 87) on a surface of the electrode body (5; 25; 55; 81), characterized in that the contact electrolyte layer (11; 29; 59; 87) and at least those on the contact -Electrolyte layer (11; 29; 59; 87) adjacent areas of the electrode body (5; 25; 55; 81)
Iodine ion-forming substances contain and / or that
the contact electrolyte layer (11; 29, 59; 87)
A salt that forms iodine ions at least in the areas of the electrode body (5; 25; 55; 81) adjoining the contact electrolyte layer (11; 29; 59; 87)
contained metal. 2. electrode arrangement .in particular according to claim 1, characterized characterized in that the electrode body (25; 55) has two flat opposite, by an ion-conductive electrolyte intermediate layer (37; 69) separate electrode layers (33, 35; 65, 67) made of metal and / or containing carbon, Having electron-conducting material, the first electrode layer '(35; 65) being connectable to the supply line and the second electrode layer (33; 67) on its facing away from the first electrode layer (35; 65) Area of contact electrolyte intended to be applied to the skin chi cht (2 9; 59) wears. 3. Electrode arrangement according to claim 2, characterized in that g e k e η η shows that the electrolyte intermediate layer (37; 69) contains a substance which forms iodine ions. 4. Electrode arrangement according to claim 3, characterized in that g e k e η η indicates that the electrolyte intermediate layer (37; 69) a salt which forms iodine ions, at least in the areas adjoining the intermediate electrolyte layer contains at least one of the two electrode layers contained metal. 5. Electrode arrangement according to claim 4, characterized in that g e k e η η shows that the electrolyte intermediate layer (37; 69) and / or the contact electrolyte layer (2 9; 59) the Iodide of the in at least one of the two electrode layers (33, 35; 65, 67), preferably the first electrode layer (35; 65) contained metal. 6. Electrode arrangement according to claim 3, characterized in that g e k e η η shows that the electrolyte intermediate layer (37; 69) Contains formyl triiodide. 7. Electrode arrangement according to one of claims 1 to 6, characterized in that the electrolyte Intermediate layer (37; 69) and / or the contact electrolyte layer (2 9; 59) contain tungstate salt of the metal. 8. Electrode arrangement according to one of claims 1 to 7, characterized in that the electrolyte intermediate layer (37; 69) and / or the contact electrolyte layer (29; 59) contain germanium. 9. electrode arrangement according to one of claims 2 to 8, characterized in that the contact electrolyte layer (2 9; 5 9) and the electrolyte intermediate layer (37; 69) contain the same substance that forms iodine ions. 10. Electrode arrangement according to claim 9, characterized in that the contact electrolyte layer (29; 59) and the electrolyte intermediate layer (37; 69) have the same qualitative composition. 11. Electrode arrangement according to one of claims 1 to 10, characterized in that the electrolyte intermediate layer (69) and / or the contact electrode j Lytschicht are contained in a carrier layer. | . 12. Electrode arrangement according to one of claims 1 to 11, characterized in that the electrolyte intermediate layer and / or the contact electrolyte layer (59) have a gel-like consistency. 13. Electrode arrangement according to one of claims 1 to 10, characterized in that the electrical Intermediate layer (37; 69) and / or the contact electrolyte layer (29) is made of solid material. 14. Electrode arrangement according to claim 1.3, characterized in that the electrolyte intermediate BADORIGINAL ORIGINAL INSPECTED ^C0PY layer (37) and / or the contact electrolyte layer (29) consist of pressed powdery material. 15. Electrode arrangement according to one of the preceding claims, characterized in that the contact electrolyte layer consists of two superimposed, There are electrolyte layers that conduct iodine ions, of which those intended to be placed on the skin are on the outside lying electrolyte layer has a liquid or gel-like viscous consistency and which is in contact with the electrode body Electrolyte layer consists of solid material and / or is contained in a carrier layer. 16. Electrode arrangement according to claim 15, characterized in that that the two electrolyte layers of the contact electrolyte layer contain the same iodine ion-conducting substance. 17. Electrode arrangement according to one of claims 2 to 16, characterized in that at least the regions adjoining the electrolyte intermediate layer (37; 69) contain at least one of the two electrode layers (33, 35; 65, 67) substances which form iodine ions.
25th 18. Electrode arrangement according to claim 17, characterized in that g e mark eichnet that at least one of the two electrode layers (33, 35; 65, 67), preferably the first electrode layer (35; 65), the iodide of the substance which forms iodine ions in the electrode layer (35; 65) contained metal. 19. Electrode arrangement according to claim 17, characterized in that at least one of the two Electrode layers (33, 35; 65, 67), preferably the first electrode layer (35; 65) formyl triiodide contains. 33Ί3977 20. Electrode arrangement according to one of claims 2 to 19, characterized in that both electrode layers (33, 35; 65, 67) have at least one Contain portion of the same metal. 21. Electrode arrangement according to claim 20, characterized in that at least one of the two, preferably both electrode layers (33, 35; 65, 67) a salt of the in both electrode layers (33, 35; 65, 67) contained metal. 22. Electrode arrangement according to claim 21, characterized in that at least one of the two is identified Electrode layers (33, 35; 65, 67), preferably the second electrode layer (33; 67) the selenium of the metal. 23. Electrode arrangement according to claim 2, characterized in that g e mark eichnet that one of the two electrode layers (33, 35; '65, 67), preferably the first electrode layer (35; 65) 40 to 80% by weight, preferably 50 to 60% by weight of a metal and 20 to 60% by weight, preferably 40 to 50% by weight, of the iodide of this metal and the other electrode layer 60 to 95% by weight, preferably 80 to 90% by weight of this metal and 5 to 40% by weight, preferably 10 Contains up to 20% by weight of the selenide of this metal. 24. Electrode arrangement according to claim 2, characterized in that one of the two electrode layers (33, 35; 65, 67), preferably the first electrode layer (35; 65) 60 to 90% by weight, preferably 75 to 85% by weight ^x s metal and 10 to 40% by weight, preferably 18 to 25% by weight of formyl triiodide and the other electrolyte layer (33; 67) 80 to 95% by weight, preferably 85 to 95% by weight, of the selenide of this metal. 25. Electrode arrangement · according to claim 2, characterized by g ο that the two electrode layers (33, 35; 65, 67) at least in the areas adjoining the electrolyte layers (2 9, 37; 59, 69) made entirely of metal. 26. Electrode arrangement according to one of claims 23 to 25, characterized in that the electrolyte intermediate layer (37; 69) and / or the contact electrolyte layer (29; 59) more than 50% by weight of iodide of the metal of the two electrode layers (3 3, 35; 65, 67) . contains. 27. Electrode arrangement according to claim 26, characterized in that that the electrolyte intermediate layer (37; 69) and / or the contact electrolyte layer (29; 5 9) contains between 5 and 40% by weight of tungstate of the metal of the two electrode layers (33, 35; 65, 67). 0 28. Electrode arrangement according to claim 27, characterized in that the electrolyte intermediate layer (37; 69) and / or the contact electrolyte layer (29; 59) 70 to 90% by weight of the iodide and 10 to 30% by weight of the tungstate. 29. Electrode arrangement according to claim 27, characterized in that the electrolyte intermediate layer (37; 6 9), and / or the contact electrolyte layer (29; 59) 50 to 80% by weight of the iodide, 10 to Contains 25% by weight of the tungstate and 10 to 25% by weight germanium. 30. Electrode arrangement according to claim 27 ^, characterized in that the electrolyte intermediate layer (37; 69) and / or the contact electrolyte layer (29; 59) 50 to 80% by weight of the iodide, 5 to 15% by weight of the Wolframats, 5 to 15 wt.% Germanium and otherwise at least formyl triiodide. BATH ORIGINAL 31. Electrode arrangement according to one of claims 23 to 30, characterized in that the metal of the two electrode layers (33, 35; 65, 67) is silver, zinc or copper. 32. Electrode arrangement according to claim 1, characterized in that the electrode body (81) Contains carbon and formyl triiodide. 33. Electrode arrangement according to claim 31, characterized in that the electrode body (81) contains activated carbon (iodine carbon) containing elemental iodine. 34. Electrode arrangement according to claim 32 or 33, characterized in that the carbon and the proportion of formyl triiodide are mixed together or poured into a plastic body. 35. Electrode arrangement according to claim 32 or 33, characterized in that the carbon and the proportion of formyl triiodide are mixed with one another or are pressure-sintered mixed to form a shaped body. j 36. Electrode arrangement according to claim 32 or 33, characterized in that the carbon and the proportion of formyl triiodide in one on one surface of one Contact part applied binder suspended: and / or is dissolved. j ! 37. Electrode arrangement according to one of claims 32 to 36, characterized in that the electrode body (81) carries a connection element (89) made of carbon. ORIGINAL INSPECTED COPY