Cell housing for a cell, cell for an energy storage device, energy storage device for a motor vehicle, and motor vehicle

Abstract

The invention relates to a cell housing for a cell (5) for an energy storage device (4) of a motor vehicle (1), the cell housing (15) having, in the interior thereof, at least one receiving chamber (18) for receiving at least one active material unit (16), the receiving chamber (18) being delimited to the outside by means of at least one housing wall (19, 20), the housing wall (19, 20) has at least one cooling chamber (7) for conducting a cooling fluid provided for cooling the active material unit (16), at least one section of the housing wall (19, 20) being plastically or elastically deformed such that an expansion of the active material unit (16), which occurs as a result of a charging cycle and / or aging, causes a deformation of the housing wall (19, 20), the cross-section of the cooling chamber (7) is at least partially reduced.

Description

Technical Field

[0001] The present invention relates to a cell housing for a cell, which is used for an energy storage device of a motor vehicle. The cell housing has at least one receiving cavity inside for receiving at least one active material unit. The receiving cavity is defined outwardly by means of at least one housing wall, and the housing wall has at least one cooling cavity for guiding a cooling fluid that is arranged to cool the active material unit. Background Art

[0002] Motor vehicles with electric drive devices (so-called electric vehicles) are becoming increasingly important. In an electric vehicle, a traction torque is generated by means of an electric motor (i.e., an electric motor). If it is stipulated that the traction torque is generated only by means of the electric motor, it is called a pure electric vehicle. If the traction torque is additionally generated by means of an internal combustion engine, it is called a hybrid vehicle.

[0003] In the case of electric vehicles, there are a series of technical challenges, which are particularly related to the electrical energy storage on the motor vehicle side required in this case. Therefore, for this purpose, rechargeable electrical energy storage devices or accumulators or energy storage devices are provided, which have a plurality of cells with electrochemically active materials. The energy storage device is connected to the electric motor so as to provide energy for the electric motor to generate a traction torque. In order to achieve a long driving range of the motor vehicle, an energy storage device with a large storage capacity is desirable.

[0004] A problem related to the energy storage device is the situation where the energy storage device generates heat during operation, especially during charging or when transmitting energy to the electric motor. However, the temperature of the energy storage device should not exceed a certain limit value to ensure the longest possible service life. In the worst case, the energy storage device may catch fire or be damaged during excessive heating, which may cause leakage of substances harmful to health and / or the environment. Therefore, it is important to cool the energy storage device in the motor vehicle. In addition to indirect cooling achieved, for example, by means of oncoming air, direct cooling is often provided for this purpose. In direct cooling, a cooling fluid is actively conveyed to the energy storage device for cooling.

[0005] Another problem in an electrical energy storage device is that the volume of the cell does not always remain constant during its service life. For example, such volume increase may occur during charging and discharging, which is also called "Swelling". Volume increase of the cell due to aging also often occurs. Such corresponding volume increase or expansion should be taken into account in terms of the structural space.

[0006] For these two problems, i.e., not only for the cooling demand but also for swelling, solutions that are feasible are known from the prior art. That is, EP 3 956 931 B1 discloses an energy storage device having a prismatic electrochemical cell and a heat exchanger. The heat exchanger is integrated into a cooling cycle to dissipate heat from the cell. The wall of the housing for the cell includes a thermally conductive insert for homogenizing the heat dissipation. The insert is designed such that the insert withstands the volume expansion during charging or discharging of the cell.

[0007] CN 2 17 903 227U discloses a cell having an outer housing with a cooling cavity and an inner housing with an electrochemically active material. For the expansion of the electrochemically active material, a gap is provided between the sides of the housing. SUMMARY OF THE INVENTION

[0008] The object of the present invention is to provide an improved solution related to an energy storage device of a motor vehicle, in particular related to the problems of cooling and swelling.

[0009] According to the present invention, in a cell housing of the type described at the beginning, this object is achieved in that at least one section of the housing wall is plastically or elastically deformable, such that the expansion of the active material unit, which occurs due to charging cycles and / or aging, causes the housing wall to deform, so that the cross-section of the cooling cavity is at least partially reduced.

[0010] The present invention is based on the idea of providing a common and synergistic means as a solution for the two problems. That is, on the one hand, a cooling fluid for cooling the active material unit is provided in the cooling cavity. On the other hand, the cooling cavity serves as a compensation volume, which can achieve volume compensation in the case of a volume change of the active material unit due to expansion. The cooling fluid can be a coolant, such as water and / or ethylene glycol.

[0011] The occurrence of swelling causes the volume of the active material unit to expand or increase and causes an increase in the space requirement of the active material unit. In the cell housing according to the present invention, this increase in space requirement is particularly fully compensated or balanced in that the cross-section of the cooling cavity is reduced. Thus, the increase in the volume of the active material unit particularly causes at least local deformation of the housing, such that in the region where the active material unit bulges, the receiving cavity bulges towards the cooling cavity. In the cooling cavity, this causes narrowing or constriction in this region. In summary, the expansion of the active material unit causes the reduction of the cooling cavity, and this reduction partially or fully compensates for the increase.

[0012] The function of the cooling cavity related to the guiding of the cooling fluid is not fundamentally impaired by the reduction of the cooling cavity. Therefore, in the case of a reduction in the cross-section of the cooling cavity, a cooling fluid volume flow sufficient to achieve a sufficiently high cooling power can basically also be generated, that is, by locally increasing the flow velocity at least. For this purpose, a coolant pump with a correspondingly sufficient power is provided. In addition, in order to maintain the cooling effect, it is generally necessary to maintain the structural integrity of the housing wall, that is, to keep the cooling cavity and the receiving cavity fluid-tight. This is achieved in such a way that the expansion of the active material unit causes plastic or elastic deformation of the housing wall. This means that the material of the housing wall has sufficient elasticity, flexibility or toughness at least in the region affected by the deformation, so that the deformation occurring within the range of the expansion of the active material unit that usually occurs does not cause the material to break.

[0013] The cell housing includes a receiving cavity into which the active material unit is inserted, in particular pushed, during the manufacture of the cell. The receiving cavity can have an opening at least towards one side, which can be closed by a closure, for example a lid, after the active material unit has been inserted. In this way, a preferably liquid-tight sealing of the receiving cavity can be achieved, for example to prevent liquid from leaking out of the active material unit. Preferably, the shape of the receiving cavity is the same as the shape of the initially or non-expanded active material unit, so that the active material unit can be inserted into the receiving cavity in an exact fit, that is, without leaving any gaps.

[0014] The active material unit forms the electrochemically active part of the cell for generating a voltage difference. The active material unit is in particular layered and can implement a lithium-ion battery or other battery types.

[0015] It is conceivable that the housing wall has at least one inner wall and at least one outer wall, wherein the cooling cavity or one of the cooling cavities is arranged between the inner wall and the outer wall. According to this embodiment, the housing wall is multi-layered or has a sandwich structure, in which the cooling cavity is located between the inner wall and the outer wall. The inner surface of the inner wall can at least partially define the receiving cavity. The outer surface of the inner wall and / or the inner surface of the outer wall can at least partially define the cooling cavity. The outer surface of the outer wall can at least partially form the outer surface of the cell housing. The inner wall has as high a heat conduction capacity as possible to ensure as effective a heat transfer as possible from the active material unit to the cooling fluid.

[0016] It is conceivable that the inner wall and the outer wall are connected to each other via at least one connecting member. The connecting member establishes a mechanical connection or coupling between the inner wall and the outer wall. The connecting member can be bridge-shaped, that is, a strip or bar that is connected to the inner wall and the outer wall, for example, at its side end faces.

[0017] Particularly preferably, the housing wall has a plurality of cooling cavities. At least some of the cooling cavities can be independent of each other in terms of flow. Preferably, at least some of the cooling cavities, in particular all of the cooling cavities, are in fluid communication with each other. Thus, the cooling fluid flow can gradually flow through or across the respective cooling cavities. The cooling fluid flow can branch at least section by section and converge again. The cooling cavity or at least one of the cooling cavities can have an elongated or stretched geometry and can thus form a cooling channel.

[0018] It is conceivable to have at least two independent cooling cavities separated from each other by connecting components. Thus, the connecting components can not only achieve the structural integrity of the cell housing, but in addition form the boundary of the cooling cavity. It is conceivable that a plurality of connecting components configured as bridges or belts or strips extend parallel to each other, so that the cooling cavities are also arranged parallel and side by side accordingly. The cooling fluid can flow through the cooling cavities in parallel or gradually, in particular meanderingly.

[0019] Preferably, the advantageous effect of volume compensation described above is achieved with the outer contour or shape of the cell housing remaining unchanged, so that the space requirement of the cell housing remains unchanged. In particular to achieve this advantage, according to the invention it is conceivable that the outer wall has a higher mechanical strength than the inner wall. If connecting components are also provided, it is conceivable that the outer wall has a higher mechanical strength than the connecting components. Different strengths, such as different elastic constants, can be achieved, for example, by different materials and / or different strengths, in particular different wall thicknesses, of the inner wall and the outer wall. Thus, according to this embodiment, the expansion of the active material unit is compensated almost exclusively by the deformation of the inner wall and, if necessary, the connecting components.

[0020] In addition or alternatively, the outer contour can be kept unchanged by arranging the cell form-locked or gaplessly in a receiving cavity that is at least approximately rigid and thus retains its initial shape in the event of bulging. Here, too, the expansion of the active material unit is compensated almost exclusively by the deformation of the inner wall and, if necessary, the connecting components. The rigid receiving cavity can be realized by means of an accumulator housing into which the cell housing or the corresponding cell is inserted.

[0021] The cell housing according to the invention can be integral. This means that the cell housing is made of a continuum or continuous material and has no joints or seams. The absence of such joints or seams avoids a reduction in the mechanical strength of the cell housing. In addition, an integral cell housing can in principle be manufactured simply.

[0022] The cell housing can be made of metal, such as aluminum, or plastic, such as PET. The cell housing can be manufactured by means of an extrusion molding method or a profile extrusion method. In this method, an endless strip with a specific cross-sectional shape is manufactured and cut at the corresponding location according to the desired length of the cell housing.

[0023] Thus, in principle, it can be conceived and is stipulated in any case in the case of the embodiments described in the previous description paragraphs that at least one receiving cavity and at least one cooling cavity extend parallel to the longitudinal direction of the cell housing, wherein the cross-section of the cell housing is constant along the longitudinal direction. The receiving cavity and the cooling cavity are initially open on both sides at the end sides of the cell housing. In order to close these cavities, at least the receiving cavity, closing elements, in particular lid-like closing elements, can be provided on both sides.

[0024] According to the invention, it can be stipulated that the geometry of the receiving cavity is prismatic or cylindrical, so that an active material unit having a prismatic or cylindrical shape can be received in the receiving cavity in a particularly precise fit and thus without gaps. For a prismatic shape, a cuboid shape can be conceived. The cuboid shape can be plate-shaped, so that two opposite outer surfaces of the active material unit form most of the entire outer surface. In particular, in the case of a cuboid cell housing, at least one cooling cavity can also have a particularly elongated cuboid shape. For a cylindrical shape, it can be assumed that the cylindrical shape is the shape of a regular cylinder. Within the scope of this embodiment, the housing wall has the shape of a hollow cylinder, wherein at least one cooling cavity can have a cross-sectional shape of an arc.

[0025] Preferably, the housing wall having the cooling cavity laterally delimits the receiving cavity, in particular delimits the entire volume of the receiving cavity. Thus, the receiving cavity can have an end side that is particularly open or closed by a closing element, the area of which is significantly smaller compared to the lateral area. Thereby, by laterally delimiting the receiving cavity by the housing wall, it is ensured that the cooling effect is as effective as possible due to the contact surface existing between the active material unit and the housing wall in this region. In addition, bulging mostly affects the lateral region of the active material unit particularly strongly or only, so that the described compensating effect is more needed in this region.

[0026] Furthermore, the invention relates to a cell for an energy storage device of a motor vehicle, which cell comprises a cell housing according to the above description and an active material unit received in the receiving cavity of the cell housing. All the advantages, features and aspects described in connection with the cell housing according to the invention can equally be transferred to the cell according to the invention, and vice versa.

[0027] Furthermore, the invention relates to an energy storage device for a motor vehicle, which energy storage device comprises a plurality of energy storage cells for storing electrical energy, wherein at least one of the energy storage cells is a cell according to the above description paragraphs. All the advantages, features and aspects described in connection with the cell housing according to the invention and the cell according to the invention can equally be transferred to the energy storage device according to the invention, and vice versa.

[0028] For the energy storage device according to the invention, it can be provided that the energy storage cells are arranged in an energy storage housing, in particular a cuboid. The energy storage housing forms or comprises a receiving cavity for the energy storage cells. The energy storage cells arranged in the receiving cavity can be electrically contacted with each other by electrical connectors, in particular in series and / or in parallel. The energy storage housing, for example made of metal, protects the energy storage cells from the outside, in particular from mechanical loads and other undesirable influences, such as, for example, moisture. The energy storage housing can have a structure comprising a plurality of compartments, which is formed, for example, by longitudinal bridges and / or transverse bridges, wherein the energy storage cells are arranged in the compartments.

[0029] The energy accumulator device may have at least one input interface and at least one discharge interface, wherein the cooling fluid guided in the cooling system of the motor vehicle can be supplied to the energy accumulator device via the input interface and can be discharged from the energy accumulator device via the discharge interface. The energy accumulator device may have a distribution unit that distributes the cooling fluid supplied via the input interface to the cooling chamber. The energy accumulator device may have a collection unit that collects the cooling fluid distributed to the cooling chamber to the discharge interface.

[0030] Finally, the invention relates to a motor vehicle comprising an electric machine and an energy storage device according to the above description paragraphs connected to the electric machine. The electric machine is configured to generate a traction torque for the motor vehicle by means of electrical energy stored in a traction energy storage device. All advantages, features and aspects described in conjunction with the cell housing according to the invention, the cell according to the invention and the energy storage device according to the invention are also transferable to the motor vehicle according to the invention and vice versa.

[0031] It is conceivable that the generation of the traction torque is realized only by means of the electric machine, so that the motor vehicle is a pure electric vehicle. It is also conceivable that the generation of the traction torque is realized additionally by means of the internal combustion engine, so that the motor vehicle is a hybrid vehicle.

[0032] In the motor vehicle according to the invention, a cooling system can be provided which forms a cooling circuit and guides a cooling fluid, in which a cooling chamber is integrated. It is conceivable that at least one coolant pump for driving the cooling fluid to circulate and at least one cooling device (which is, for example, a condenser or a heat exchanger) are integrated in the cooling circuit, by means of which heat can be dissipated from the cooling fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Further advantages, features and details of the invention are apparent from the following description of the exemplary embodiments and from the accompanying drawings. The drawings schematically show:

[0034] Figure 1 shows a schematic top view of a motor vehicle according to the invention according to one embodiment with an energy storage device according to the invention according to one embodiment,

[0035] Figure 2 Cross-sectional view of an electric cell housing according to the invention for an electric cell according to the invention according to one embodiment. The electric cell is a component of an energy storage device of a Figure 1 motor vehicle.

[0036] Figure 3 Schematic perspective view of an active material unit which is inserted into the Figure 2 electric cell housing for forming an electric cell.

[0037] Figure 4 Cross-sectional view of an energy storage device of a motor vehicle including an electric cell with a cell housing that varies with respect to Figure 2 before bulging occurs, and Figure 1 and a cross-sectional view of the same after bulging occurs.

[0038] Figure 5 Shows the same as Figure 4 after bulging occurs. Detailed description

[0039] Figure 1 Top view of a motor vehicle 1 according to the invention. The motor vehicle is an electric vehicle and thus includes an electric motor 2 configured to generate a traction torque. The traction torque can be transmitted from the electric motor 2 via a powertrain 3 to the wheels of the motor vehicle 1. Optionally, the motor vehicle 1 additionally includes an internal combustion engine for generating a traction torque.

[0040] The electrical energy required to operate the electric motor 2 is stored in a rechargeable energy storage device 4 of the motor vehicle 1 according to the invention. The energy storage device 4 includes a plurality of energy storage cells designed as electric cells 5 according to the invention. These electric cells 5 are received inside a cuboid-shaped energy storage housing 6 that forms a receiving space, and the energy storage housing is made of metal, in the present case steel. To cool the energy storage device 4, each electric cell 5 has a plurality of cooling cavities 7 designed as cooling channels, where, for the sake of clarity, only two of the cooling cavities 7 are shown as dashed lines in Figure 1 each case.

[0041] The accumulator device 4 or the cooling chamber 7 is integrated into the cooling system 8 of the motor vehicle 1, and the cooling system forms a cooling circuit and guides the cooling fluid. The cooling fluid circulating in the cooling system 8 is, for example, a water-ethylene glycol mixture. The cooling system 8 has: a coolant pump 9 by means of which the cooling fluid can be conveyed; and a cooling device 10 which is, for example, a condenser and / or a heat exchanger and by means of which heat can be dissipated from the cooling fluid. The accumulator device 4 has an input interface 12 and a discharge interface 11, via the input interface the coolant can be conveyed to the accumulator device 4, and via the discharge interface the coolant can be discharged from the accumulator device 4. The distribution unit 14 distributes the cooling fluid conveyed via the input interface 12 to the cooling chamber 7. The collecting unit 13 collects the cooling fluid distributed to the cooling chamber 7 - after it has flowed through the cooling chamber 7 - to the discharge interface 11.

[0042] The following will describe, according to Figure 2 and Figure 3 the details related to the cell 5. Thus, each of the cells 5 includes a cell housing 15 according to the present invention and an active material unit 16. In Figure 2 a cross-sectional view of the cell housing 15 extending perpendicular to the longitudinal direction 17 is shown. Figure 3 A perspective view of the active material unit 16 is shown. The active material unit 16 forms the electrochemically active part of the respective cell 5 for generating a voltage difference. In the present case, the active material unit 16 is designed as layered and realizes a lithium-ion battery.

[0043] The cell housing 15 is an integral component made of aluminum and is manufactured by means of an extrusion molding method. Alternatively, the cell housing 15 can be made of plastic and manufactured by means of a profile extrusion method. The receiving cavity 18 of the cell housing 15 (in which the active material unit 16 for the cell 5 can be inserted) and the geometry of the cell housing 15 are prismatic, i.e., flat cuboid-shaped. The shape of the receiving cavity 18 corresponds to the shape of the active material unit 16, so that the active material unit can be inserted into the receiving cavity 18 in an accurately fitting and gapless manner. For this geometry, according to the present invention, different shapes can also be envisaged, such as cylindrical.

[0044] Since the cell housing 15 manufactured by means of an extrusion molding method is initially open at the end sides, the resulting receiving cavity 18 of the cell 5 should be closed on both sides by means of cover-like closures (which are not shown in detail in the figure).

[0045] The cell housing 15 has four lateral housing walls 19, 20 which extend perpendicular to the initially open end side of the cell housing 5. Specifically, there are two relatively large-area housing walls 19 opposite each other and two relatively small-area housing walls 20 opposite each other. After the active material unit 16 is inserted into the receiving cavity 18, one of the large-area housing walls 19 respectively contacts one of the large-area outer surfaces 21 of the active material unit 16, and the small-area housing walls 20 contact the small-area outer surfaces 22 of the active material unit 16.

[0046] The following refers to Figure 2 to explain the details related to the housing walls 19, 20 having the cooling cavities 7. Thus, the housing walls 19, 20 respectively have an inner wall 23 and an outer wall 24, and the inner wall and the outer wall are connected to each other via a bridge-shaped connecting member 25. The inner wall 23 defines the receiving cavity 18. The outer wall 24 forms the lateral outer surface of the resulting cell 5. The connecting members 25 respectively separate the cooling cavities 7 in pairs from each other. The cooling cavities 7 are flowed through by the cooling fluid in parallel, but can also be flowed through successively, for example, in a meandering manner. The cooling cavities 7 are initially open at the end side and are respectively fluid-sealedly connected to the distribution unit 13 or the collection unit 14 here.

[0047] The following refers to Figure 4 , Figure 4 shows a cross-sectional view of a part of the energy storage device 4. The energy storage device includes a plurality of cells 5, and for the sake of clarity, only two of them are shown in Figure 4 . It can be seen that the cells 5 are received in the receiving cavity of the energy storage housing 6 in an accurately fitting and gapless manner. As already described, in order to form the cells 5, the cell housing 15 and the active material unit 16 according to Figure 2 and Figure 3 are respectively used. In terms of the cell housing 15, the following change has been made, that is, the cooling cavity 7 is only provided in the large-area housing walls 19, especially because the large-area housing walls contact the large-area outer surfaces 21 of the active material unit 16, and thus sufficient and effective heat transfer from the active material unit 16 to the cooling fluid is achieved.

[0048] Figure 4 shows the energy storage device 4 just after manufacturing, while Figure 5 shows the same energy storage device 4 in which the active material unit 16 has expanded laterally and the so-called "bulging" has occurred. This expansion may occur during the charging of the energy storage device 4 or due to aging. The expansion of the active material unit 16 causes the corresponding housing walls 19 having the cooling cavities 7 to deform. Therefore, the cross-section of the cooling cavity 7 arranged in the expansion area is at least partially reduced. Therefore, the receiving cavity 18 increases in this area, and this increase is compensated by the reduction of the cooling cavity 7.

[0049] The deformation of the housing walls 19, 20 takes place plastically or elastically, such that the receiving chamber 18 and the affected cooling chamber 7 only undergo a change in their shape, but their structural integrity remains unchanged. That is, no material failure or fracture occurs in the deformation zone, such that the fluid tightness of the chambers 7, 18 remains unchanged. The cooling effect of the cooling chamber 7 affected by the tapering remains unchanged, since the coolant pump 9 maintains the throughput or volume flow of the cooling fluid flowing through the cooling chamber 7 at a sufficiently high level.

[0050] In the present case, the outer contour or the shape of the cell housing 15 also remains at least approximately the same or unchanged despite the expansion of the active material unit 16. On the one hand, this is due to the fact that the cell 5 is form-fittingly and precisely received in the accumulator housing 6, wherein the mechanical stability of the accumulator housing 6 counteracts the corresponding deformation. On the other hand, this is achieved in that, in the present case, the outer wall 24 has a higher mechanical strength than the inner wall 23 and than the connecting part 25. Although not visible in the figure, the reason for the difference in mechanical strength is that the thickness or strength of the outer wall 24 is significantly greater than that of the inner wall 23 and the connecting part 25. In principle, different mechanical strengths can also be achieved by using different materials for the corresponding sections of the housing walls 19, 20.

Claims

1. An electric cell housing for an electric cell (5), which is used in an energy storage device (4) of a motor vehicle (1), wherein, The cell housing (15) has at least one receiving cavity (18) inside for receiving at least one active material unit (16), wherein the receiving cavity (18) is defined outwardly by means of at least one housing wall (19, 20), and wherein the housing wall (19, 20) has at least one cooling cavity (7) for guiding a cooling fluid which is provided for cooling the active material unit (16). It is characterized in that at least one section of the housing wall (19, 20) can be plastically or elastically deformed, so that due to swelling of the active material unit (16) occurring as a result of charge cycles and / or aging, the housing wall (19, 20) is deformed, such that the cross-section of the cooling cavity (7) is at least partially reduced.

2. The cell housing according to claim 1, wherein The housing wall (19, 20) has at least one inner wall (23) and at least one outer wall (24), wherein the cooling cavity (7) or one of the cooling cavities (7) is arranged between the inner wall (23) and the outer wall (24).

3. The cell housing according to claim 2, characterized in that, The inner wall (23) and the outer wall (24) are connected to one another via at least one, in particular bridging, connecting member (25).

4. The cell housing according to claim 3, wherein At least two independent cooling cavities (7) separated from one another by means of the connecting member (25).

5. The cell housing according to any one of claims 2 to 4, characterized in that, The outer wall (24) has a higher mechanical strength than the inner wall (23).

6. The cell housing according to any one of the preceding claims, characterized in that, The cell housing is integral.

7. The cell housing according to claim 6, characterized in that, The cell housing (15) made of metal or plastic is manufactured by means of an extrusion molding method or a profile extrusion method.

8. The cell housing according to any one of the preceding claims, characterized in that The geometry of the receiving cavity (18) is prismatic or cylindrical, such that the active material unit (16) having a prismatic or cylindrical shape can be received in the receiving cavity in a particularly precise fit.

9. The cell housing according to any one of the preceding claims, characterized in that, The housing wall (19, 20) having the cooling cavity (7) laterally, in particular completely, defines the receiving cavity (18).

10. A cell for an energy storage device (4) of a motor vehicle (1), the cell comprising the cell housing (15) according to any one of the preceding claims and an active material unit (16) received in the receiving cavity (18) of the cell housing (15).

11. An accumulator device for a motor vehicle (1), the accumulator device comprising a plurality of accumulator cells for storing electrical energy, wherein, At least one of the energy storage cells is the cell (5) according to claim 10.

12. The accumulator device according to claim 11, characterized in that, The energy storage cells are arranged inside an energy storage housing (6) which is in particular cuboid-shaped.

13. A motor vehicle, the motor vehicle comprising an electric machine (2) and an energy storage device (4) according to claim 11 or 12 connected to the electric machine (2), wherein, The electric motor (2) is provided for generating a traction torque for the motor vehicle (1) by means of the electrical energy stored in the energy storage device (4).

14. The motor vehicle according to claim 13, characterized in that A cooling system (8) which forms a cooling cycle and guides a cooling fluid, in which the cooling cavity (7) is integrated.

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