DE102009025802A1 - Refrigerated cell accumulator and method of making same - Google Patents

Abstract

The invention relates to a method for the production of accumulators with cooled, in particular produced in wound construction, cells and the accumulators produced therewith. The accumulators manufactured are characterized by the fact that they are particularly easy and inexpensive to manufacture and cool well. The inventive method for producing a rechargeable battery with cooled cells includes the steps of producing one or more electrochemical cells, producing a single- or multi-cell accumulator housing with double-walled, longitudinally extending, open web chamber structure by extrusion, extrusion and / or injection molding, wherein the individual cells of Accumulator honeycomb are arranged, inserting the electrochemical single cell or individual cells in the cells of the accumulator housing, wherein the individual cells are either encapsulated in a metal sleeve also hexagonal cross-section or used directly into the battery cells, closing the accumulator and interconnection of the individual battery cells.

Description

The The invention relates to a method for producing accumulators with cooled, in particular manufactured in winding construction, Cells and the accumulators made with it. The manufactured accumulators are characterized by being particularly simple and inexpensive produce and cool well.

The inventive method is in principle for all accumulator types are suitable. Of particular practical importance are thereby those, which are based on cells in winding construction, as well as the lithium-based accumulators, because here the outstanding performance characteristics associated with an increased temperature sensitivity.

lithium-based Accumulators, d. H. Accumulators, the electromotive force by the shift of lithium ions can be generated in the main thing in two groups: lithium-ion batteries and lithium-polymer batteries. The lithium polymer accumulator represents a further development of the lithium-ion battery and differs from this in the electrolyte used. Unlike the liquid electrolytes are here Polymer-based electrolytes of solid or gelatinous consistency used. Since the pure solid polymer electrolyte has the disadvantage have that they only from about 60 ° C a sufficient conductivity develop, they are increasingly being replaced by the gel-like, which are ready for use even at room temperature.

Lithium-ion batteries are usually made of cells having a graphite negative electrode or, more recently, nanocrystalline amorphous silicon capable of intercalating with lithium, a separator and a positive electrode of LiMO ₂ (M = Mn, Co , Ni or mixed oxides of these metals), LiMn ₂ O ₄ or LiFePO ₄ . The electrolytes used are salt solutions of LiPF ₆ or, more rarely, LiBF ₄ or LiClO ₄ in aprotic organic solvents such as ethylene carbonate, propylene carbonate, diethylene carbonate or dimethyl carbonate. The separator is usually a highly porous film of polyethylene or polypropylene, which can store the electrolyte in its large pore volume.

In the case of the lithium-polymer accumulator, polymer films replace the electrolyte. These films are for example polyethylene oxide with a dispersed principle, polyvinylidene fluoride or poly [vinylidene fluoride-hexafluoropropylene]. In order to obtain polymer gel electrolytes, it is known to use conductive salt solutions as plasticizers. So will in the DE 34 85 832 T2 For example, a combination of polyethylene oxide or its derivatives with propylene carbonate, ethylene carbonate, tetramethylene sulfone, γ-butyrolactone or dimethylformamide is described, which is mixed with a conductive salt and extruded into a film.

Derlei Lithium-based accumulators are characterized by a particularly high energy density, the absence of a memory effect and the constant voltage delivery via the discharge process out. These features coupled with the low weight, the small Dimensions and the (for lithium-polymer batteries) as far as possible Freedom of form explain the attractiveness of these accumulators for modeling, small and micro devices the entertainment and communications industry as well as automotive.

in the Automotive, the lithium-based batteries are both as Starter batteries for internal combustion engines as well as vehicle batteries used for electric vehicles. Especially with the car batteries become high peak and also permanent currents from the accumulators taken, which can lead to a strong warming of the cells. Because too much warming of the cells causes damage or even causing destruction of the cells, even the Explosion of the accumulator can be an effective Cooling possibility for the cells of the accumulator desirable. Especially with larger cell groups There is a difficulty here in the defective War meableitung outward, which is partly due to the poor thermal conductivity the polymers lies. Despite the required cooling option Of course, the accumulator should still be as compact as possible be built so that the cramped space in the engine compartment modern vehicles will not be charged additionally.

There have therefore been disclosed in the art various constructive variations of the arrangement of individual cells and a cooling device to an accumulator. That's how it describes EP 1 213 784 A2 the arrangement of cells of hexagonal cross-section to a honeycomb cell composite, each in the middle of six surrounding cells, a cooling channel remains free, which is traversed by a liquid cooling medium. The liquid cooling medium, which is preferably water, is cooled down again above the accumulator via a cooling fin attachment, through which air flows. In addition, a vacuum is applied to the cooling channel system, which brings the boiling point of the water to a value below critical operating temperatures of the cells. Nothing is said about the shape of the electrode coils within each cell. It is therefore to be assumed that this is the customary circular-cylindrical winding form, which has been housed in a hexagonal capsule.

Out This construction results in several disadvantages. First Once the heat transfer from the circular cylindrical Electrode winding to the hexagonal sleeve not optimal, because only at the six tangent points of inscribed in the hexagon Circle is a direct contact with the wall. Further goes through the cooling channel in each case a place for a cell lost. Then only have two, three or four of the six side surfaces the cells in the accumulator contact the cooling medium. And finally, the weight of the cell goes up liquid cooling medium, the circulation system and the cooling fin attachment, whereby the weight advantage over again narrowed down to conventional lead-acid batteries becomes.

In the DE 103 52 046 A1 discloses a likewise honeycomb-shaped housing for an accumulator, which is flowed through by a cooling medium and equipped with receiving elements for circular cylindrical cells, each having three or more rib-like "expansion joints". The housing consists only of the outer walls and has no subdivisions or partitions. The receiving elements are fixed in their position in that they pinch each other with the preferred six "expansion joints" and possibly stuck in mounts in the bottom and lid of the battery.

Also This construction has the disadvantage that between the receiving elements relatively unused space for the cells because of the cooling medium channels remains. When using a liquid cooling medium This again creates a weight disadvantage whether the big one Amounts of liquid. But that's one too ensured all-sided cooling medium access. moreover is the production-technical effort quite high, because many partly Complex molded parts (bottom bracket, cover bracket, each a receiving element per cell) and are to assemble.

task The present invention was based on the described Disadvantages of the known construction forms cooled Accumulator housing an optimized design of a rechargeable battery with improved cooling properties at the same time as possible To develop a compact design, and a method for their production provide.

• – Herstellen einer oder mehrerer elektrochemischer Einzelzellen,
• – Herstellen eines ein- oder mehrzelligen Akkumulatorgehäuses mit doppelwandiger, in Längsrichtung verlaufender, offener Stegkammerstruktur durch Strangpressen, Extrusion und/oder Spritzguss, wobei die einzelnen Zellen des Akkumulators wabenförmig angeordnet sind,
• – Einsetzen der elektrochemischen Einzelzelle oder Einzelzellen in die Zellen des Akkumulatorgehäuses, wobei die Einzelzellen entweder vorher in einer Metallhülse ebenfalls hexagonalen Querschnitts gekapselt werden oder direkt in die Akkumulatorzellen eingesetzt werden,
• – Verschließen des Akkumulators,
• – Zusammenschaltung der einzelnen Akkumulatorzellen.

This object is achieved by the inventive method for producing a rechargeable battery with cooled cells including the process steps

• Manufacture of one or more electrochemical single cells,
• Producing a single-cell or multi-cell accumulator housing having a double-walled, longitudinally extending, open stub chamber structure by extrusion, extrusion and / or injection molding, wherein the individual cells of the accumulator are arranged honeycomb-shaped,
• Inserting the individual electrochemical cell or individual cells into the cells of the accumulator housing, wherein the individual cells are either encapsulated beforehand in a metal sleeve of likewise hexagonal cross-section or inserted directly into the accumulator cells,
• Closing the accumulator,
• - Interconnection of the individual battery cells.

• – Herstellen eines bahnförmigen Elektrodenverbundes,
• – Wickeln des bahnförmigen Elektrodenverbundes auf einen Wickelkern mit hexagonalem Querschnitt,
• – Verbinden der Elektrodenanschlüsse mit einem Anschlussterminal,
• – Herstellen eines ein- oder mehrzelligen Akkumulatorgehäuses mit doppelwandiger, in Längsrichtung verlaufender, offener Stegkammerstruktur durch Strangpressen, Extrusion und/oder Spritzguss, wobei die einzelnen Zellen des Akkumulators wabenförmig angeordnet sind,
• – Einsetzen des oder der Elektrodenwickel in die Zellen des Akkumulatorgehäuses, wobei die Elektrodenwickel entweder vorher in einer Metallhülse ebenfalls hexagonalen Querschnitts gekapselt werden oder direkt in die Akkumulatorzellen eingesetzt werden,
• – Tränken der Separatorfolien mit einem flüssigen Elektrolyten, wenn kein Polymerelektrolyt zur Herstellung des bahnförmigen Elektrodenverbundes verwendet wurde,
• – Verschließen des Akkumulators,
• – Zusammenschaltung der einzelnen Akkumulatorzellen.

Particularly preferably, the electrochemical individual cells are each produced in a wound construction and the method accordingly includes the method steps

• - producing a web-shaped electrode composite,
• Winding the web-like electrode composite onto a winding core with a hexagonal cross-section,
• Connecting the electrode terminals to a connection terminal,
• Producing a single-cell or multi-cell accumulator housing having a double-walled, longitudinally extending, open stub chamber structure by extrusion, extrusion and / or injection molding, wherein the individual cells of the accumulator are arranged honeycomb-shaped,
• Inserting the electrode winding or wound into the cells of the accumulator housing, wherein the electrode windings are either encapsulated beforehand in a metal sleeve of likewise hexagonal cross-section or inserted directly into the accumulator cells,
• Impregnating the separator foils with a liquid electrolyte if no polymer electrolyte was used to produce the web-shaped electrode composite,
• Closing the accumulator,
• - Interconnection of the individual battery cells.

To achieve a compact cell structure, the method according to the application uses the well-known winding construction method. For this purpose, a web-shaped electrode composite is first produced. An example of the schematic structure of such a network show 1a and 1b , The composite material is then wound on a winding core of hexagonal cross-section. The winding core can be inexpensively made of plastic or metal by extrusion, extrusion and / or injection molding. If, according to a particularly preferred embodiment, the winding core is hollow, then the electrode connection is completed after completion of the electrode winding (FIG. 5 ) led from the bottom through the cavity upwards. That lie both terminals on one side of the electrode coil ( 5 ) and can easily be connected to a connection terminal. The electrode connections are connected to a connection terminal.

The Accumulator housing is in the form of a honeycomb structure one or more cells also by extrusion, extrusion and / or injection molding. At materials come here accordingly mechanically and thermally stable plastics such. B. ABS or PC or metals in question. Particularly preferably, the preparation takes place made of extruded aluminum, since this is an excellent Heat conduction and mechanical stability by means a simple, flexible and cost-effective process can be achieved.

The Housing includes partitions for subdivision into the individual cells. All housing walls have a top and bottom open web chamber structure. Through this It is possible to design every cell completely from all sides to be able to cool. This leaves the space-saving Grouping in honeycomb shape obtained. Depending on the cooling requirement or used cooling medium, the chambers in The size can be varied by the wall thickness is adjusted accordingly. This is how the wall thicknesses can be optimally adapted to the cooling while minimized Dimensions of the cell.

In the case of injection molding, the soil ( 7 ) are integrated directly into the housing. In the extrusion and extrusion processes, the soil ( 7 ) are manufactured separately and used in the wall construction. For this purpose, either the inner walls of the cell composite are shortened by the thickness of the bottom part, so that a flat bottom surface is created by inserting the bottom plate, or a patch bottom plate has holes for matching the web chamber structure.

The prepared electrode coils ( 5 ) are then inserted into the cells. It is both possible to insert them directly into the cells, as well as to encapsulate them in metal sleeves of precisely fitting hexagonal cross-section. Preferably, these sleeves also have a web chamber structure. However, it is also possible to use simple sleeves without web chamber walls.

Before the interconnection of the individual cells, the impregnation of the separator films is still effected with a liquid electrolyte, unless a polymer electrolyte has been used in the electrode assembly. Then the accumulator with the lid ( 7 ), the statements on the ground ( 7 ) apply analogously, so either the use of a perforated lid or the reduction of the intermediate walls. The electrodes are in this case contacted with a conductive passage through the cell cover (s) and / or the cell bottom (s) which form the plus and minus poles on the outside of the cells or of the rechargeable battery.

In a particularly preferred embodiment of the method is it is the accumulator to a lithium-based accumulator. in this connection are both the lithium-ion batteries and the lithium-polymer batteries includes. They are currently the most interesting application represents.

Prefers the electrode contact located on the underside of the electrode coil passes through guided the cavity in the center of the electrode coil upwards, so that both electrode connections on one side of the Electrode coils are arranged.

According to a further embodiment of the method, the accumulator is composed of a plurality of individual cells ( 8th ) hexagonal cross-section, which are inserted into a honeycomb-shaped accumulator housing. This is a composite of single cells (see 2e ), which are plugged into a housing without intermediate walls. Both full-walled and web chamber structures are possible with the housing walls. This variant of the housing has the advantage that when a cell fails, it can be easily removed and replaced. Furthermore, this embodiment variant also includes the possibility that the housing consists only of one or more strapping bands in the corresponding honeycomb form, which hold the cell composite together.

In the embodiment of the invention according to the Main claim is the accumulator housing designed to that the cooling of the cells by the convective flow through is achieved by ambient air through the web chamber structure. In an alternative embodiment variant, the web chamber structure the outer walls of the accumulator housing and / or the cell walls with means for conveying a liquid and / or gaseous cooling medium connected. Suitable for this example, blowers or propeller for air or a pump system for Water. Thus, the cooling system in particular in connection targeted with a variation of the web chamber size tailored to the required cooling capacity. Even when using liquid cooling media results compared to the known types of cooled Accumulator housings still a weight advantage, since the used Liquid quantity due to the comparatively small-volume web chamber structure considerably smaller than this one.

The Object of the present invention is further by an accumulator solved, which is characterized by the fact that he or a has several cells of hexagonal cross section, which is a honeycomb Forming a composite; the outer wall of the accumulator housing and / or the cell walls a double-walled, longitudinally have running, open web chamber structure; the electrode connections on one side of the electrode coils in a connection terminal are summarized.

All more preferably, the electrodes of the cells consist of one web-shaped electrode composite, which on a massive or hollow winding core of hexagonal cross section is wound.

Especially preferred is the one located on the underside of the electrode coil Electrode contact through the cavity in the center of the electrode coil led upwards so that both electrode connections are arranged on one side of the electrode coil.

According to a further particularly preferred embodiment of the invention, the accumulator consists of four cell units which, as in FIG 2 and 3 are arranged shown. A four cell array of cells, when using lithium based cells, allows the generation of the voltage needed for a 12V starter battery and is therefore of particular interest.

In an alternative embodiment, the accumulator consists of several individual cells ( 8th ) hexagonal cross-section, which are inserted into a honeycomb accumulator housing. The composite of single cells (see 2e ) is plugged into a housing without intermediate walls. Both full-walled and web chamber structures are possible with the housing walls. Furthermore, there is also the possibility that the housing consists only of one or more strapping bands in the corresponding honeycomb form, which hold the cell assembly together.

Particularly preferred are the electrode coils ( 5 ) encapsulated in a metal sleeve of hexagonal cross section prior to insertion into the cells. This allows easy replacement of a defective cell. Alternatively, the electrode coils ( 5 ) are inserted directly into the cells without previous capsules. This simplifies the production of the accumulators, because one step is eliminated and no additional sleeves are needed. A decision as to which type of encapsulation with its respective advantages is preferable is to be made on a case-by-case basis based on the desired price segment and the intended use.

Furthermore, the bottom plate ( 7 ) and the lid ( 7 ) of the accumulator is particularly preferred. with holes corresponding to the ends of the channels of the ridge chambers of the cell walls of the encapsulated cells (see 2d ). Thus, it is ensured that the cooling medium as well as through the outer and intermediate walls (see above) also through the walls of the in 2c shown encapsulated cells can flow.

All the accumulator outer walls are particularly preferred and / or the cell walls by the convective flow through cooled by air through the web chamber channels. By appropriate dimensioning of the web chamber structure can thereby achieved a passive cooling of the accumulator by air which are compared to the liquid cooling systems brings various benefits. The system is moved by the lack of Share maintenance and trouble-free (unlike circulation pumps) and much easier, since it is not a liquid medium, and There are no pumps. In addition, the system is essential in the production Uncomplicated, because there are no sealed delivery channels for Liquids are. Also with regard to the safety-related Aspect is convective air cooling superior to liquid cooling as it is in the case of a leak of a cell not by incoming fluids to short circuits and thus fire and explosion hazard can come.

Becomes taken from the accumulator a high continuous or peak current and the purely convective air cooling is therefore not enough more out to the accumulator below critical temperature values To keep the accumulator outer walls and / or the cell walls with means for conveying a liquid and / or gaseous cooling medium get connected. Suitable for this example Blower or propeller for air or a pump system for water. Unlike the known liquid-cooled However, there is almost no danger of accumulators Leakage, as with the web chamber channels one of the electrode windings there is a separate flow system.

As already stated above can be by appropriate Selection of the cooling system the best possible cooling conditions at the lowest possible additional weight for the respective Purpose.

In 1a Fig. 2 is a plan view of an example of the sheet-shaped electrode composite material. One recognizes the separator foil ( 3 ) and the electrode foils ( 1 ) and ( 2 ).

In 1b is a cross section through the in 1a illustrated composite that the Offset of the electrode films and the sequence between Separatorfolien ( 3 ) and electrode films ( 1 . 2 ) shows.

2a shows the top view of a four-cell accumulator housing ( 4 ). In the circled enlarged detail, the web chamber structure can be seen. The black areas are the bars connecting the outer wall with the inner one. The white areas are the open bridge channels.

In the 2 B to 2e For the purpose of better optical distinctness, in each case a small distance between the electrode windings (shown hatched) and the web chamber walls or the web chamber walls was left one below the other. For the actual technical design it is understood that these surfaces must of course have direct contact to ensure a good heat transfer.

In 2 B is the four-cell accumulator housing ( 4 ) out 2a in which the electrode windings ( 5 ) were used directly.

In 2c again is the four-cell accumulator housing ( 4 ) out 2a shown, in this time encapsulated electrode winding ( 6 ) were used. The encapsulation is shown in the figure as an example in web chamber design. However, it can also be done with a simple wall.

2d shows a top view of the floor or lid ( 7 ) (the parts are logically identical) of the four-cell accumulator housing ( 4 ). The black areas are formed by a solid plate into which the web chambers of the outer walls and the encapsulated electrode windings ( 6 ) out 2c Precise holes were introduced so that the cooling medium can flow through. It is also a variant without the outer ring of holes possible, which is used when the bottom or lid ( 7 ) not on the edge of the case ( 4 ) is placed, but the intermediate walls shortened accordingly and soil ( 7 ) and lid ( 7 ) are then inserted into the outer walls.

2e contains an image of a four-cell accumulator housing consisting of four single-cell housings ( 8th ) is composed. What is not graphically captured is the nature of the summary. The quad cluster could either be held together with one or more strapping bands or else into a four-cell accumulator housing ( 4 ) out 2a analog housing can be inserted without intermediate walls, the walls can be made solid or in web construction again.

In 3 is a perspective view of the four-cell accumulator housing ( 4 ) out 2a displayed.

4 is a plan view of a twelve-cell accumulator housing ( 9 ). From this example it can be seen how the honeycomb structure of larger cell units is provided.

in the Below, the invention is illustrated by way of example become. It represents only a preferred embodiment of the Invention is in no way limiting understand.

A Starter battery for a vehicle with internal combustion engine was made up of four series-connected lithium-ion cells as the nucleus built of the accumulator. In each case, both electrodes of the led individual cells up and connected, that resulted in a battery voltage of 13.6 volts. The single ones Cells were on the case back in a recording a defined distance to the ground. This ensured that it warms the cells to an air circulation can come.

Plus- and negative terminal of the cell block were connected to electronics, which monitors the charging and discharging of the accumulator and controls. Furthermore, the temperature and state of charge of the accumulator were monitored, as well as the functional safety and the life expectancy of the accumulator calculated from it.

Of the Cell block and the electronics were countered by a battery cover Splashed water. This can be the case optionally gas-tight. In such a design variant The air then circulates in the accumulator housing for cooling itself. The electrodes of the cell block were made with two pole bolts connected, which are accessible from the outside.

The lithium-ion cells were produced in lithium-iron-phosphate technology. The electrodes were wound around a hollow core of hexagonal cross-section. The resulting winding was placed in a sleeve also hexagonal in cross-section. This was made of aluminum and had an outer wall with web chamber structure. The production of the sleeve was carried out in a cost-effective extrusion process. The bridge chambers were open at the top and bottom. The electrodes of the coil were contacted with electrical feedthroughs which had been inserted into the bottom and lid used to close the accumulator cell. In the lid, a membrane was further introduced, which controls the overpressure produced by generated by overloading the cell gas. The lower electric de was performed in this embodiment by a passage in the bottom and lid of the cell through the hollow winding core upwards. This facilitates the contacting and mounting of the cells to a cell block.

1, 2

electrode foils

3

separator films

4

vierzelliges battery housing

5

electrode winding

6

encapsulated Electrode winding (in web chamber construction)

7

Bottom or lid of ( 4 )

8th

Single-cell housing

9

zwölfzelliges battery housing

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 3485832 T2 [0005]
• - EP 1213784 A2 [0008]
• - DE 10352046 A1 [0010]

Claims (16)

Method for producing a rechargeable battery with cooled cells containing the process steps - Produce one or more electrochemical single cells, - Produce a single or multi-cell accumulator housing with double-walled, longitudinally extending, open web chamber structure by extrusion, extrusion and / or injection molding, the individual Cells of the accumulator are arranged honeycomb, - Deploy the electrochemical single cell or single cells in the cells the accumulator housing, wherein the single cells either previously in a metal shell also hexagonal cross-section be encapsulated or inserted directly into the accumulator cells become, Closing the accumulator, - interconnection the individual accumulator cells. Method according to claim 1, characterized in that that the electrochemical single cells in each case in winding construction be prepared and the method the process steps - Produce a web-shaped electrode composite, - Wrap of the web-shaped electrode composite on a winding core with hexagonal cross section, - Connect the electrode connections with a connection terminal, - making a or multicellular accumulator housing with double-walled, longitudinally extending, open web chamber structure by extrusion, extrusion and / or injection molding, the individual Cells of the accumulator are arranged honeycomb, - Deploy the or the electrode winding in the cells of the accumulator housing, wherein the electrode winding either before in egg ner metal sleeve likewise hexagonal cross-section can be encapsulated or directly be used in the accumulator cells, - watering the Separatorfolien with a liquid electrolyte, if no polymer electrolyte for the production of the sheet-like Electrode composite was used, - closing of the accumulator, - interconnection of the individual battery cells includes. Method according to Claims 1 and 2, characterized in that the accumulator is a lithium-based accumulator is. Method according to Claims 1 to 3, characterized that is located on the underside of the electrode coil electrode contact through the cavity in the center of the electrode coil upwards so that both electrode connections are on one side of the electrode winding are arranged. Method according to Claims 1 to 4, characterized that the accumulator consists of several single cells of hexagonal cross-section formed in a honeycomb-shaped accumulator housing be used. Method according to Claims 1 to 5, characterized that the web chamber structure of the outer walls of the Accumulator housing and / or the cell walls with Means for conveying a liquid and / or be connected gaseous cooling medium. Accumulator, characterized in that - he has one or more cells of hexagonal cross-section, the form a honeycomb composite; - the Outer wall of the accumulator housing and / or the Cell walls a double-walled, longitudinal have running, open web chamber structure; - the Electrode connections on one side of the electrochemical Single cells are combined in a connection terminal. Accumulator according to Claim 7, characterized that the electrodes of the cells from a web-shaped electrode composite consist of hexagonal on a massive or hollow hub Cross section is wound up. Accumulator according to Claims 7 and 8, characterized that the electrode contact located on the underside of the electrode coil by led the cavity in the center of the electrode coil upwards so that both electrode connections are on one side of the electrode winding are arranged. Accumulator according to Claims 7 to 9, characterized that it consists of four cell units. Accumulator according to Claims 7 to 10, characterized that the accumulator consists of several single cells of hexagonal cross-section which is inserted into a honeycomb-shaped accumulator housing are. Accumulator according to Claims 7 to 11, characterized that the electrode coils before insertion into the cells in a Metal sleeve of hexagonal cross-section were encapsulated. Accumulator according to claim 7 to 11, since characterized in that the electrode coils are inserted directly into the cells. Accumulator according to Claims 7 to 13, characterized that the bottom plate and the lid of the accumulator with holes are provided with the ends of the channels of the web chambers the cell walls correspond. Accumulator according to Claims 7 to 14, characterized that the accumulator outer walls and / or the cell walls cooled by the convective flow of air through the web chamber channels become. Accumulator according to Claims 7 to 14, characterized that the accumulator outer walls and / or the cell walls with means for conveying a liquid and / or gaseous cooling medium are connected.