Electrochemical cell stacking unit

Abstract

Title: Electrochemical Cell Stacking Unit. Stack (10) of electrochemical cells comprising at least one electrical current conduction (70) for the transfer of electrical energy, in particular for the transport of a high-voltage current between the high-voltage current-collecting plate (53) of the displacement plate arrangement (50) and the second high-voltage terminal (64) of the second high-voltage contact plate (63) of the second end plate arrangement (60), wherein at least one electrical current conduction (70) is disposed between the high-voltage current-collecting plate (53) and the second high-voltage terminal (64), wherein at least one electrical current conduction (70) can change in length during the stroke compensation operation of the electrochemical cell stack (20). Figure for the abstract: Fig. 2

Description

Title of the invention: Electrochemical cell stacking unit

[0001] The invention relates to an electrochemical cell stacking unit / a cell unit consisting of electrochemical cells which can be used for example as a fuel cell unit for the electrochemical production of electrical energy from hydrogen and / or as an electrolysis cell unit for the production of hydrogen and oxygen from electrical energy. State of the art

[0002] Electrochemical cell stacking units are used in a wide variety of fixed and mobile applications.

[0003] In electrochemical cell stacking units, a plurality of individual electrochemical cells are arranged stacked one on top of the other in the form of a cell stack, also referred to as a cell pack, so that cell stacking units can be considered in general as a galvanic energy producer or energy transformer which, by means of redox reactions, transforms fuel and oxidizing agent supplied continuously to an anode and a cathode into electrical energy and vice versa.

[0004] For electrolysis and fuel cells, various technology variants are available, in particular PEM electrolysis or PEM fuel cell, in which PEM indicates a proton exchange membrane, in variant AEM (anion exchange membrane), SOEC (solid oxide electrolysis cell) or AEL (liquid alkaline electrolysis).

[0005] The stack of electrochemical cells in a cell stacking unit is usually delimited by two high-voltage contact plates, the high-voltage contact plates respectively comprising a high-voltage terminal for taking an output voltage.

[0006] In this regard, for example, the high-voltage contact plate having the positive high-voltage terminal is arranged directly above and the high-voltage contact plate having the negative high-voltage terminal directly below the end of the cell stack. It is also possible to place the high-voltage contact plate having the negative high-voltage terminal directly above and the high-voltage contact plate with the positive high-voltage contact terminal directly below the end of the cell stack.

[0007] The stacking of electrochemical cells may in certain embodiments include, due to operation, variations in length such that, in a manner corresponding to the height of the stacking of cells, the distance between the two high-voltage terminals, in particular, the distance between the positive high-voltage terminal and the negative high-voltage terminal, varies.

[0008] Since the distance between the high-voltage terminals is not constant, a very complex, space-consuming and very expensive current rail module is required to conduct the current out of the stack of electrochemical cells. Description of the invention

[0009] The invention relates, according to a first aspect, to a stacking unit for electrochemical cells comprising:

[0010] - a first arrangement of end plates comprising a first plate at the end, a first insulating plate and a first high-voltage contact plate, wherein the first high-voltage contact plate has a first high-voltage terminal,

[0011] - a second arrangement of end plates comprising a second plate at the end, a second insulating plate and a second high-voltage contact plate, in which the second high-voltage contact plate has a second high-voltage terminal,

[0012] - an arrangement of displacement plates comprising a movable plate of displacement and a high-voltage current collection plate, in which the displacement plate arrangement is disposed between the first end plate arrangement and the second end plate arrangement,

[0013] - a stack of electrochemical cells comprising a first part lower end and a second upper end part, in which the stack of electrochemical cells can extend, in particular can extend by changing its length, along a longitudinal axis of the stack of electrochemical cells, in which the lower end part is electrically connected to the first high-voltage plate and the second upper end part to the high-voltage current collection plate,

[0014] - a plurality of elastic elements for applying pressure to the stack of electrochemical cells and for performing compensation due to a variation in the length of the electrochemical cell stack, in which the elastic elements are arranged between the displacement plate arrangement and the second end plate arrangement,

[0015] - a plurality of tensioning elements, in which, by the plurality of elements tensioners, the first arrangement of end plates, the second arrangement of end plates, the arrangement of displacement plates of the electrochemical cell stack and the plurality of elastic elements are immobilized, wherein the plurality of tensioning elements are in a tensed state and the plurality of elastic elements are in a compressed state,

[0016] - at least one conduction of electric current for the transfer of energy electrical, in particular for the transport of a high-voltage current, between the high-voltage current collection plate of the displacement plate arrangement and the second high-voltage terminal of the second high-voltage contact plate of the second end plate arrangement, wherein at least one electrical current conduction is disposed between the high-voltage current collection plate and the second high-voltage terminal,

[0017] - in which at least one electrical current conduction can be modified in length during the execution of the stroke compensation of the electrochemical cell stack.

[0018] The core idea of ​​the invention is therefore to take the output voltage, not as in the prior art directly above the end of the stack of variable height cells, but to carry the current to the end of the stack of cells by the arrangement of displacement plates and by at least one electrical current conduction to the arrangement of end plates so that the output voltage can be taken in particular at the high voltage contact plate of the arrangement of end plates.

[0019] By routing the current through the arrangement of displacement plates and by at least one electrical current conduction, the second high-voltage terminal for taking the output voltage is moved in particular further upwards, i.e. in the arrangement of end plates above the stack of electrochemical cells.

[0020] The first high-voltage terminal is constituted within the framework of the present invention preferably as a negative high-voltage terminal and the second high-voltage terminal preferably as a positive high-voltage terminal. However, it is also possible to constitute the reverse, with the first high-voltage terminal as a positive high-voltage terminal and the second high-voltage terminal as a negative high-voltage terminal.

[0021] The displacement of the positive high-voltage terminal in the end-plate arrangement above the stack of electrochemical cells has, compared to the prior art, the particular advantage that a distance can be ensured constant between the two high voltage terminals in particular a constant distance between the positive high voltage terminal and the negative high voltage terminal.

[0022] A complex, bulky, and very expensive module of several current rail systems is thus no longer necessary to conduct the current out of the stack of electrochemical cells. The current can be conducted outwards in a very simple manner via the high-voltage terminals of the end plate arrangements.

[0023] Other features and advantages of the invention are described below. In order to convey the current to the end of the cell stack by means of displacement plates, it is advantageously provided, according to a first embodiment, that the moving displacement plate is made of an electrically conductive material in a contact area with at least one electrical current conductor or comprises an electrically conductive material, the contact area being electrically insulated from the external environment. The contact area is sealed against fluid and pressure, as well as electrically insulated, with respect to the external environment.

[0024] The moving displacement plate may also, as is customary in the prior art, not be electrically conductive and not include any electrically conductive material.

[0025] In order to be able to carry the current to the end of the cell stack by it, it is provided, according to another embodiment, that at least one electrical current conduction is, for the production of a high voltage link, connected directly to a current outlet of the high voltage current collection plate.

[0026] The basic idea of ​​the invention is to have a simple and inexpensive electrical current conduction for the transport of electrical energy, in particular for the transport of a high voltage current, between the high voltage current collection plate of the displacement plate arrangement and the second high voltage terminal of the second high voltage contact plate of the second end plate arrangement.

[0027] For this purpose, according to the invention, it is provided to put at least one electrical current conduction between the high voltage current collection plate and the second high voltage terminal.

[0028] It is further provided, according to the invention, that it is possible to modify in length at least one electrical current conduction during the execution of the compensation of the stroke of the stack of electrochemical cells.

[0029] Preferably for this purpose, at least one electrical current conduction is constituted in the form of an electrically conductive high-tension spring.

[0030] Preferably, at least one electrical current conduction is constituted in the form of a flexible high-voltage current cable.

[0031] Preferably, the electric current conduction is constituted in the form of a flexible, multi-layered, high-voltage rail.

[0032] Preferably, the electric current conduction is constituted in the form of a high-voltage linkage that can be deflected.

[0033] Preferably, the electric current conduction is constituted in the form of a flexible solid strip.

[0034] Other characteristic advantages and details of the invention will become apparent in the following description, in which examples of embodiments of the invention are described in detail with reference to the drawings. The various features mentioned in this document may be essential according to the invention individually or in any combination.

[0035] The invention will be explained in more detail below with reference to the accompanying drawings.

[0036] These represent schematically, respectively:

[0037] Fig. 1 is a perspective view of an electrochemical cell stacking unit according to a first embodiment of the present invention;

[0038] The [Fig.2] is an elevation view of an electrochemical cell stacking unit according to a first embodiment of the present invention having several electrically conductive high-voltage springs;

[0039] The [Fig.3] is an elevation view of an electrochemical cell stacking unit according to a first embodiment of the present invention having several flexible high-voltage current cables;

[0040] The [Fig.4] is an elevation view of an electrochemical cell stacking unit according to a second embodiment of the present invention having an electrically conductive high-tension spring;

[0041] The [Fig.5] is a plan view of a first arrangement of end plates according to another embodiment of the present invention;

[0042] Fig. 6 is a plan view of a second arrangement of end plates according to another embodiment of the present invention.

[0043] Fig. 1 is a perspective view of a stacking unit 10 of electrochemical cells according to a first embodiment of the present invention.

[0044] The electrochemical cell stacking unit 10 comprises a first arrangement 40 of end plates, a second arrangement 60 of end plates, an arrangement 50 of displacement plates, and a stack 20 of electrochemical cells comprising a first lower end portion 21 and a second upper end portion 22, and a plurality of elements 90 Tensioners. The electrochemical cell stacking unit 10 according to the invention can be used essentially as a fuel cell unit for the electrochemical production of electrical energy from hydrogen and / or as an electrolysis cell unit for the production of hydrogen and oxygen from electrical energy. The electrochemical cell stacking unit 10 according to the invention can thus be considered generally as a galvanic energy producer or as an energy transformer, which transforms, by means of a redox reaction, fuel and an oxidizing agent continuously supplied to an anode and a cathode into electrical energy and vice versa. In the figures shown, the electrochemical cell stack 20 is constituted as a stack of FC cells, which consists of electrochemical cells stacked individually one on top of the other.

[0045] Figure 2 is an elevational view of a stack 10 of electrochemical cells according to the first embodiment of the present invention. The stack 20 of electrochemical cells can expand, in particular change in length, along a longitudinal axis L of the stack 20 of electrochemical cells.

[0046] The stack 20 of electrochemical cells consists of individual electrochemical cells stacked one on top of the other which, due to the effect of pressure and heat, can expand and contract again during operation. The expansion of the individual electrochemical cells in turn results in an elongation or shortening of the stack 20 of electrochemical cells.

[0047] In other words, the stack of 20 electrochemical cells has, due to the operations, variations in length, which are compensated by a plurality of 80 elastic elements.

[0048] The elastic elements 80 are used in particular to apply pressure to the stack 20 of electrochemical cells and to compensate for travel variations due to variations in the length of the stack 20 of electrochemical cells. The elastic elements 80 compress the electrochemical cell element 20 so that the elastic elements 80 compensate for the loss of tensile force through settling effects over the lifetime. In the figure shown, the elastic elements 80 are, by way of example, constituted in the form of tension springs.

[0049] As can be seen in [Fig. 2], the electrochemical cell stacking unit 10 further comprises a plurality of tensioning elements 90. The tensioning elements 90 can be constituted, for example, in the form of tie rods, threaded studs, winding tension bands, or the like.

[0050] In the present invention, the tensioning elements 90 are preferably constituted in the form of wrapping tension bands having fixing ends 95, the wrapping tension bands 90 surrounding respectively the first arrangement 40 of end plates and the fixing ends 95 of the wrapping tension bands 90 being connected respectively to the second arrangement 60 of end plates so that the first arrangement 40 of end plates, the second arrangement 60 of end plates, the arrangement 50 of displacement plates, the stack 20 of electrochemical cells and the plurality of elastic elements 80 are immobilized by the plurality of wrapping tension bands 90, the plurality of wrapping tension bands 90 being in a tensed state and the plurality of elastic elements 80 in a compressed state.

[0051] The first arrangement 40 of end plates comprises a first end plate 41, a first insulating plate 42 and a first high-voltage contact plate 43, the first high-voltage contact plate 43 having a first high-voltage strip 44.

[0052] The second arrangement 60 of end plates comprises a second end plate 61, a second insulating plate 62 and a second high-voltage contact plate 63, the second high-voltage contact plate 63 having a second high-voltage terminal 64.

[0053] The first high-voltage terminal 44 is preferably constituted as a negative high-voltage terminal in the context of the present invention, and the second high-voltage terminal 64 is preferably constituted as a positive high-voltage terminal. However, it is also possible to constitute the reverse: the first high-voltage terminal 44 as a positive high-voltage terminal and the second high-voltage terminal 64 as a negative high-voltage terminal.

[0054] The distance between the first high-voltage terminal 44, in particular the positive high-voltage terminal, and the second high-voltage terminal 64, in particular the negative high-voltage terminal, is constant.

[0055] In other words, the distance between the first high-voltage band 44 and the second high-voltage band 64 does not vary at any instant during operation, in particular during current transport and output voltage sampling.

[0056] In Figures 1 to 7, the high-voltage terminals 44, 64 are shown for illustration and better understanding in a lateral portion of the high-voltage contact plates 43, 63. The high-voltage terminals 44, 64 can in fact be placed in any suitable portion of the high-voltage contact plates 43, 63.

[0057] The displacement plate arrangement 50 comprises a movable displacement plate 51 and a high-voltage current collection plate 53, the displacement plate arrangement 50 being disposed between the first end plate arrangement 40 and the second end plate arrangement 60.

[0058] As can be clearly seen further in [Fig.2], the electrochemical cell stacking unit 10 further comprises at least one electrical current conduction 70 for the transport of electrical energy, in particular for the transport of a high voltage current, between the high voltage current collection plate 53 of the displacement plate arrangement 50 and the second high voltage terminal 64 of the second high voltage contact plate 63 of the second end plate arrangement 60, the at least one electrical conduction 70 being disposed above the high voltage current collection plate 53 and below the second high voltage terminal 64, the at least one electrical current conduction 70 being able to change in length during the execution of the stroke compensation of the electrochemical cell stack 20.

[0059] The first lower end portion 21 of the stack 20 of electrochemical cells is electrically connected to the high-voltage contact plate 43, and the second upper end portion 22 of the stack 20 of electrochemical cells is connected to the high-voltage current collection plate 53. During operation of the electrochemical cell stack unit 10, the plurality of individual electrochemical cells in the stack 20 of electrochemical cells generate a high-voltage electric current of high intensity, which, for connection with external current-consuming devices, can be derived from the first high-voltage terminal 44 and the second high-voltage terminal 64. The insulating plates 42, 62 serve in particular to completely prevent electrical loss to the outside of the high-voltage contact plates 43, 63.

[0060] In the prior art, the second high-voltage terminal 64, i.e., the positive high-voltage terminal, is mounted directly on the second upper end portion 22 of the stack 20 of electrochemical cells. Since the stack 20 of electrochemical cells has variations in length due to operation, the distance between the two high-voltage terminals 44, 64 also varies according to the height of the cell stack. A very complex current rail module, requiring significant construction space, is therefore necessary to conduct the current out of the stack 20 of electrochemical cells. This problem is eliminated by the electric current conduction 70 according to the invention.

[0061] The central idea of ​​the invention is to take the output voltage, not, as in the prior art, directly from the upper second part 22 end of stack 20 of electrochemical cells, but to carry the current to the second upper part 22 of the end of stack 20 of electrochemical cells by way of the arrangement 50 of displacement plates and by at least one conduction 70 of electric current to the second arrangement 60 of end plates so that the output voltage can be taken in particular at the second high voltage terminal 64 of the second high voltage contact plate 61 of the second arrangement 60 of end plates.

[0062] By routing the current through the arrangement 50 of displacement plates and by at least one electrical current conduction 70, the positive high-voltage terminal 64 for the output voltage is shifted further upwards, i.e., into the second high-voltage contact plate 61 of the second arrangement 60 of end plates above the stack 20 of electrochemical cells. Compared to the prior art, the shifting of the second positive high-voltage terminal 64 has the particular advantage that a constant distance can be ensured between the two high-voltage terminals 44 and 64, in particular a constant distance between the positive high-voltage terminal 64 and the negative high-voltage terminal 44.

[0063] According to the invention, at least one electrical current conduction 70 is provided. Preferably, several electrical current conductions 70 are provided.

[0064] In the [Fig.2] shown there are several conductions 70 of electric current, which are constituted in the form of high voltage spring 71 electrically conductive.

[0065] The electrically conductive high-voltage springs 71 are distinct from the elastic elements 80 constituting a tension spring. However, it is possible that some or all of the elastic elements 80 constitute electrically conductive high-voltage springs 71.

[0066] Electrically conductive high-voltage springs 71 are particularly suitable for static or dynamic electrical applications. These electrically conductive high-voltage springs 71 also allow for a constant and reliable high-voltage connection during shocks and vibrations. These electrically conductive high-voltage springs 71 effectively control high, medium, and low currents over extended periods with minimal heat generation in a compact design.

[0067] In order to be able to convey the current to the second upper end part 22 of the stack 20 of electrochemical cells via the arrangement 50 of displacement plates, it is preferably provided, according to a first embodiment, that the movable displacement plate 51 is constructed in a way that conducts electricity in a part 55 in contact with the conduction 70 of electric current or comprise an electrically conductive material, the contact part 55 being electrically insulated from the external environment.

[0068] It is possible that the contact part 55 has at least one high-voltage passage for the passage of at least one electrical current conduction 70. By means of the high-voltage passage, a direct high-voltage connection can be provided, for example, between the electrical current conduction 70 and the high-voltage current collection plate 53 of the displacement plate arrangement 50.

[0069] Fig. 3 is an elevation view of a stacking unit 10 of electrochemical cells according to the first embodiment of the present invention comprising several flexible high-voltage current cables 72.

[0070] In this embodiment, there is no need for a high-voltage, electrically conductive spring 71, which is quite expensive and valuable, to carry the current to the upper end second part 22 of the stack 20 of electrochemical cells via the arrangement 50 of displacement plates. The flexible high-voltage current cables 72 can pass easily through the elastic elements 80 already used, i.e., through the tension springs or laterally, parallel to the tension springs.

[0071] The flexible high-voltage current cables 72 have very good electrical conductivity. In addition, the flexible high-voltage current cables 72 may have very good insulation in places so that they can be guided within the elastic elements 80 already used.

[0072] The [Fig.4] is an elevation view of a stacking unit 10 of electrochemical cells according to the second embodiment of the present invention comprising an electrically conductive high-voltage spring 71.

[0073] In this embodiment, the movable displacement plate 51 is, as is customary in the prior art, non-conductive and does not comprise any electrically conductive material. The elastic elements 80 also do not have an electrically conductive function and consist of conventional tension springs.

[0074] In order to be able to carry the current to the second upper end part 22 of the stack 20 of electrochemical cells, it is provided, according to the second embodiment, that at least one electrical current conduction 70, in particular the electrically conductive high-voltage spring 71, is, for the production of a high-voltage connection, directly connected to a current-picking device 54 of the high-voltage current-collecting plate 53.

[0075] To completely prevent electrical loss from the high-voltage current collection plate 53 to the outside, the displacement plate arrangement 50 has a third insulating plate 52.

[0076] In the figures shown, the electrical current conduction 70 passes, for illustration and ease of understanding, through a lateral part of the stack 20 of electrochemical cells. The electrical current conduction 70 can in fact pass through any suitable part.

[0077] It is also possible to constitute the electrical current conduction 70 according to the invention in another embodiment in the form of a flexible, multi-layered high-voltage rail 73.

[0078] A flexible, multi-layered high-voltage rail 73 of this type can be made, for example, of several individual copper current rails, which are deformable and, in particular, can be bent. The flexible, multi-layered high-voltage rail 73 is thus very well suited for high dynamic loads and high temperatures. The flexible, multi-layered high-voltage rail 73 is also very well suited for compensating for system movement, in particular for compensating for the layer of the electrochemical cell stack 20 during operation.

[0079] The flexible, multi-layered high-voltage rail 73 is also very lightweight and has very good electrical conductivity. Furthermore, the flexible high-voltage rail 73 has, in some areas, very good insulation from the external environment.

[0080] It is also possible to constitute the electrical current conduction 70 according to the invention in another embodiment in the form of a high-voltage rail linkage 74 that can be deflected.

[0081] Such a high-voltage rail linkage 74 that can be deflected may consist, for example, of electrically conductive and insulated bars, hinges, and ball joints. The bars may, for example, be made of copper, aluminum, or another electrically conductive material.

[0082] The bars are very robust and are very well suited for precise translational movements under large dynamic loads and high temperatures.

[0083] The linkage 74 of the high-voltage bar that can be deflected is therefore also very well suited for compensating the stroke of the stack 20 of electrochemical cells during operation.

[0084] In one embodiment, the electric current conduction 70 according to the invention can be constituted in the form of a flexible solid strip 75. A flexible solid strip 75 of this kind can, for example, have a flat cross-sectional profile and be made of a lattice of a plurality of thin copper wires. or a bundle of thin copper sheets. The flexible, solid 75 strip has very good electrical conductivity and, in some places, very good insulation.

[0085] In figures 1 to 4 shown, the end plates 41, 61, the insulating plates 42, 62, the high-voltage contact plates 43, 63 are constituted in the form of separate components.

[0086] In another embodiment, the insulating plates 42, 62 and the high-voltage contact plates 43, 63 are integrated into the end plates 41, 61 so that the end plate arrangements 40, 60 each consist of only one plate. An individual plate of this kind may, for example, be a plate made of one or more different materials which has, in places, electrical conductivity and electrical insulation.

[0087] In another embodiment, the insulating plate 52 and the high-voltage current collection plate 53 are integrated into the movable displacement plate 51 so that the displacement plate arrangement 50 consists of only one plate.

[0088] Figure 5 is a plan view of a first arrangement 40 of end plates according to another embodiment of the present invention. In the first arrangement 40 of end plates shown, the first end plate 41, the first insulating plate 42 and the first high-voltage contact plate 43 are integrated so that the first arrangement 40 of end plates shown consists of only one plate.

[0089] The first arrangement 40 of end plates shown has a plurality of openings 45 for the connection points of the connecting line (supply and evacuation of fluids).

[0090] As can be clearly seen in [Fig. 5], the first high-voltage terminal 44, therefore The negative high-voltage terminal is provided in a portion of the side terminal. The first high-voltage terminal 44 may, however, be placed in any suitable part of the first arrangement 40 of end plates shown.

[0091] Fig. 6 is a plan view of a second arrangement 60 of end plates according to another embodiment of the present invention.

[0092] In the second arrangement 60 of end plates shown, the second end plate 61, the second insulating plate 62 and the second high-voltage contact plate 63 are integrated so that the second arrangement 60 of end plates shown consists of only one plate.

[0093] Compared to the first arrangement 40 of end plates shown in [Fig.5], the second arrangement 60 of end plates shown in [Fig.6] does not have an opening for connection points of connecting line (supply and evacuation of fluids).

[0094] As can be seen in [Fig. 6], the second high-voltage terminal 64, i.e., the positive high-voltage terminal, is provided in a corresponding lateral terminal portion. However, the second high-voltage terminal 64 can be placed in any suitable portion of the second arrangement 60 of end plates shown.

[0095] The first high-voltage terminal 44 and the second high-voltage terminal 64 can be arranged identically and analogously to each other. The first high-voltage terminal 44 and the second high-voltage terminal 64 can also be arranged independently of each other in different positions.

[0096] .

Claims

1. Demands Electrochemical cell stacking unit (10) comprising: - a first arrangement (40) of end plates including a first end plate (41), a first insulating plate (42) and a first high-voltage contact plate (43), wherein the first high-voltage contact plate (43) has a first high-voltage terminal (44), - a second arrangement (60) of end plates including a second end plate (61), a second insulating plate (62) and a second high-voltage contact plate (63), wherein the second high-voltage contact plate (63) has a second high-voltage terminal (64), - an arrangement (50) of displacement plates including a movable displacement plate (51) and a high-voltage current collection plate (53),in which the arrangement (50) of displacement plates is disposed between the first arrangement (40) of end plates and the second arrangement (60) of end plates, - a stack (20) of electrochemical cells comprising a first lower end part (21) and a second upper end part (22), wherein the stack (20) of electrochemical cells can extend, in particular can extend by changing its length, along a longitudinal axis (L) of the stack (20) of electrochemical cells, wherein the lower end part (21) is electrically connected to the first high-voltage plate (43) and the second upper end part (22) to the high-voltage current collection plate (53), - a plurality of elastic elements (80) for applying pressure to the stack (20) of electrochemical cells and for performing compensation due to a variation in length of the stack (20) of electrochemical cells, wherein the elastic elements (80) are arranged between the arrangement (50) of displacement plates and the second arrangement (60) of end plates, - a plurality of tensioning elements (90), in which, by the plurality of tensioning elements (90), the first arrangement (40) of plates end plate, the second arrangement (60) of end plates, the arrangement (50) of displacement plates of the stack (20) of electrochemical cells and the plurality of elastic elements (80) are immobilized, wherein the plurality of tensioning elements (90) are in a tensed state and the plurality of elastic elements (80) are in a compressed state, - at least one conduction (70) of electric current for the transfer of electrical energy, in particular for the transport of a high-voltage current, between the high-voltage current collection plate (53) of the arrangement (50) of displacement plates and the second high-voltage terminal (64) of the second high-voltage contact plate (63) of the second arrangement (60) of end plates, wherein at least one conduction (70) of electric current is disposed between the high-voltage current collection plate (53) and the second high-voltage terminal (64),- in which at least one conduction (70) of electric current can change in length during the execution of the stroke compensation of the stack (20) of electrochemical cells.

2. Electrochemical cell stacking unit (10) according to claim 1, characterized in that the movable displacement plate (51) is electrically conductive in a contact portion (55) with at least one electrical current conduction (70) or comprises an electrically conductive material in which the contact portion (55) is electrically insulated from the external environment.

3. Electrochemical cell stacking unit (10) according to claim 1, characterized in that at least one electrical current conduction (70) is for the production of a high voltage link connected directly to a current tap (54) of the high voltage current collection plate (53).

4. Unit (10) of electrochemical cell stacking according to any one of the preceding claims, characterized in that at least one electrical current conduction (70) is constituted in the form of a high-voltage electrically conductive spring (71).

5. Electrochemical cell stacking unit (10) according to any one of the preceding claims 1 to 3, characterized in that at least one electric current conduction (70) is constituted in the form of a flexible high-voltage current cable (72).

6. Electrochemical cell stacking unit (10) according to any one of the preceding claims 1 to 3, characterized in that the electric current conduction (70) is constituted in the form of a flexible, multi-layered, high-voltage rail (73).

7. Electrochemical cell stacking unit (10) according to any one of the preceding claims 1 to 3, characterized in that the electric current conduction (70) is constituted in the form of a high-voltage linkage (74) that can be deflected.

8. Electrochemical cell stacking unit (10) according to any one of the preceding claims 1 to 3, characterized in that the electric current conduction (70) is constituted in the form of a flexible solid strip (75).

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