Cooling device for a traction battery of a motor vehicle, motor vehicle and method for mounting a traction battery of a motor vehicle

Abstract

The invention relates to a cooling device (12) for a traction battery of a motor vehicle, comprising a flexible cooling element (10) which can be permeated by a cooling fluid and which is designed to be applied laterally to battery cells (14) of the traction battery to be cooled, and comprising at least one dimensionally stable framework element (20) by means of which the cooling element (10) is held in shape.

Description

[0001] The invention relates to a cooling device for a traction battery of a motor vehicle, a motor vehicle and a method for assembling a traction battery of a motor vehicle.

[0002] DE 10 2019 116 969 A1 discloses an energy storage device for a motor vehicle, which comprises a plurality of round cells for electrochemical energy storage. Furthermore, the energy storage device comprises several holding frames for holding the round cells, wherein the round cells are attached at their ends to opposing holding frames. The round cells are arranged in layers, with cooling elements for cooling the round cells provided between at least two layers. The cooling elements are at least partially wave-shaped.

[0003] The object of the present invention is to provide a solution which enables a particularly simple installation of a cooling device on battery cells to be cooled by means of the cooling device.

[0004] This object is achieved according to the invention by the subject matter of the independent claims. Further possible embodiments of the invention are disclosed in the subclaims, the description, and the figures. Features, advantages, and possible embodiments presented in the description for one of the subject matter of the independent claims are to be regarded at least analogously as features, advantages, and possible embodiments of the respective subject matter of the other independent claims, as well as any possible combination of the subject matter of the independent claims, optionally in conjunction with one or more of the subclaims.

[0005] The invention relates to a cooling device for a traction battery of a motor vehicle. The traction battery can be a so-called high-voltage storage device. The traction battery is designed to provide electrical energy for an electric drive train of the motor vehicle. Thus, the motor vehicle can be electrically driven using electrical energy from the traction battery. The traction battery can comprise a plurality of battery cells, in particular round cells.

[0006] To prevent the battery cells from overheating during operation, they must be cooled. The cooling device is designed to cool the battery cells of the traction battery. For this purpose, the cooling device comprises a flexible cooling element through which a cooling fluid can flow. These flexible components, which are also referred to as dimensionally unstable, form-labile, or non-dimensionally stable components, are characterized by a low modulus of elasticity, low tensile stiffness, and therefore large deformations even as a result of low force and moment loading. This flexible cooling element is designed to be applied laterally to the battery cells of the traction battery to be cooled.Due to the flexible design of the cooling element, the cooling element can be applied to the respective battery cells to be cooled over a particularly large area, thereby achieving a particularly large heat transfer surface between the battery cells and the cooling element. As a result, heat can be transported away from the battery cells particularly quickly by means of the cooling element via the particularly large heat transfer surface, whereby the battery cells can be cooled particularly effectively by means of the cooling element. The cooling element has at least one cooling channel through which the cooling fluid can flow. The cooling fluid is, in particular, a cooling liquid.

[0007] In order to enable particularly simple and secure application of the flexible cooling element to the side of the battery cells to be cooled, the cooling device is provided with at least one dimensionally stable framework element, by means of which the cooling element is held in shape. The cooling element is thus stabilized by means of the framework element. This means that the framework element prevents the flexible cooling element from falling out of its shape and thus, for example, collapsing. Because the cooling element is held in shape by means of the at least one framework element, this cooling element can be applied particularly precisely to the side of the battery cells to be cooled, whereby a predetermined heat transfer surface can be reliably achieved between the cooling element and the respective battery cells to be cooled.The described cooling device enables particularly simple and precise assembly of the traction battery in that the flexible cooling element can be particularly easily placed laterally on the respective battery cells to be cooled. Furthermore, by stabilizing the flexible cooling element by means of the framework element, it is possible for the cooling device to be pre-assembled on a base of the traction battery, in particular for a plurality of cooling devices to be arranged on the base of the traction battery, and for respective battery cells to then be inserted into the battery cell between adjacent, pre-assembled cooling devices, in particular in the axial direction of the respective battery cells designed as round cells. This allows the traction battery to be particularly easily assembled.Furthermore, pre-assembling the cooling devices on the base of the traction battery ensures that the specified dimensions of a battery cell complex formed by the traction battery cells and the cooling devices are maintained, as the pre-assembled arrangement of the cooling devices on the base of the traction battery precisely defines the respective positions of the battery cells. Thus, by arranging the cooling devices during pre-assembly on the base of the traction battery, compliance with the specified tolerance limits of the battery cell complex can be particularly well ensured.

[0008] The described cooling system is based on the realization that assembling battery modules or battery cell complexes with side cooling can be challenging, especially with cylindrical battery cells and thus round cells. Most side coolers are extruded from aluminum. While aluminum is relatively light and mechanically robust enough for most applications, gaps can remain between the side cooler and the battery cells. Therefore, the described solution proposes pre-assembling the side coolers and the battery cells, especially before they are inserted into a traction battery housing.

[0009] The flexible cooling element has the advantage that, after filling with the cooling fluid, it can ensure particularly good thermal contact with the battery cells. Their thickness changes as a result of the filling with the cooling fluid, allowing the cooling element to wrap itself, at least in part, around the battery cells to be cooled. The disadvantage of the flexible cooling element, however, is that it lacks mechanical rigidity, which complicates pre-assembly. To enable this pre-assembly, the cooling device is designed so that the flexible cooling element is held in shape by the dimensionally stable framework element, thus stabilizing it.

[0010] In one possible development of the invention, it is provided that the cooling element comprises a film tube. The flexible cooling element is thus formed from a film. Due to the tubular design of the cooling element, at least one cooling channel is provided through which the cooling fluid can flow. This film tube can be designed in the form of an elongated tube through which the cooling fluid can be conducted. The flexible cooling element is thus an elongated hollow body through which the cooling fluid can flow. Due to the design of the cooling element from the film, the cooling element has particularly thin walls, whereby particularly good heat transfer can be achieved from the battery cells, against which the cooling element rests, to the cooling fluid flowing in the cooling element.

[0011] In this context, it can be provided in particular that the film tube is closed by means of an injection-molded framework element. This means that, on the one hand, the film tube is held in shape by means of the framework element and, in addition, bursting of the film tube or tearing of the film tube seams can be particularly effectively prevented. The film tube can tend to open at certain seams under higher pressure, which can pose a risk of leaks. By means of the injection-molded framework element, this opening of the film tube at the seams can be particularly effectively prevented, whereby the risk of leaks can be kept particularly low. Because the framework element is injection-molded, the geometric design of the framework element can be particularly well adapted to the shape in which the film tube is to be held.The film tube can thus be held particularly well in the specified shape by means of the injection-molded framework element.

[0012] In an alternative possible embodiment of the invention, the framework element is crimped to the film tube. This means that a crimp connection exists between the film tube and the framework element. This ensures that the framework element is held particularly securely to the film tube. The risk of the framework element becoming detached from the film tube and the resulting collapse of the film tube can thus be kept particularly low.

[0013] In this context, a further embodiment of the invention can provide for the framework element to be fastened to the film tube via a crimp connection, whereby the film tube is closed via the crimp connection. The crimp connection can therefore be used to reliably keep the seam of the film tube closed, in particular. Furthermore, the crimp connection can be used to hold a seam of the film tube particularly securely closed, provided the framework element is crimped to the film tube around the seam. The at least one framework element crimped to the film tube thus enables the seams of the film tube to be kept particularly securely closed, in particular when the cooling fluid flows through the film tube under pressure. The risk of leakage can thus be kept particularly low.

[0014] In a further possible embodiment of the invention, it can be provided that the film tube is sealed at the crimp connection by means of a crimp sealing element arranged between the framework element and the film tube. For example, the crimp sealing element can be placed around the seam of the film tube and the framework element can be placed against the crimp sealing element on an outer side facing away from the film tube. The framework element is then crimped onto the film tube together with the crimp sealing element. The framework element is placed around the seam of the film tube and pressed against the film tube, with the crimp sealing element being arranged at the seam of the film tube between the framework element and the film tube to seal this crimp connection. The crimp connection of the framework element to the film tube can ensure that the framework element is held particularly securely to the film tube.The crimp sealing element ensures that the crimp connection is particularly tight, thus minimizing the risk of the cooling fluid escaping from the film tube through the seam. This minimizes the risk of leakage from the cooling system.

[0015] In a further alternative embodiment of the invention, it is provided that the framework element is designed as a closure clip and closes the film tube. This means that by means of the closure clip, the film tube is held together at at least one seam in order to prevent the seam from bursting or opening, and at the same time the film tube is kept in shape. The closure clip can have two legs which can be moved towards one another to close the film tube, whereby the film tube is clamped, in particular squeezed, between the legs of the closure clip. As a result, the film tube can be held particularly securely closed, in particular in the region of its seam, in that areas of the film tube which adjoin one another at the seam are pressed together by means of the closure clip.This makes it particularly effective to prevent the seam from opening due to the adjacent areas of the film tube coming loose. For example, the legs of the closure clip can be held together at one end of the respective closure clip so that they can pivot relative to each other about a pivot axis. To press the areas of the film tube together, the legs of the closure clip are pivoted toward each other about the pivot axis, whereby the film tube is pressed between the legs. The design of the framework element as a closure clip enables particularly simple and quick attachment of the framework element to the film tube and also ensures that the seams of the film tube are kept closed particularly securely.

[0016] In a further possible embodiment of the invention, the cooling element is held in a wave-like shape by means of the framework element. The wave shape of the cooling element enables the battery cells of the traction battery, which are in particular designed as round cells, to be inserted into respective recesses in the wave shape. By inserting the battery cells into the recesses of the wave shape, a particularly large contact area can be achieved between the cooling element and the battery cells resting on the cooling element. As a result, a particularly large heat transfer area is achieved, which enables particularly good heat transfer from the battery cells to the cooling element. In this case, the cooling element has in particular the shape of a transverse wave.With this waveform, an amplitude direction, in which the amplitudes of the waveform rise, and an extension direction, in which the waveform runs, are perpendicular to one another. Both the extension direction and the amplitude direction run perpendicular to an axial direction of the battery cells designed as round cells, to which the cooling element is applied laterally when used as intended in the traction battery. The axial direction of the round cells coincides with a longitudinal extension direction of the center axis of the respective round cells. This means that when used as intended in the traction battery, the respective center axes of the battery cells designed as round cells run perpendicular to the extension direction and perpendicular to the amplitude direction of the waveform of the cooling element.When used as intended, the cooling element rests laterally against the respective round cells in the amplitude direction and laterally in the extension direction. The respective end faces of the round cells therefore do not rest against the cooling element when the cooling element is used as intended. The cooling element therefore rests against the outer surface of the respective round cells when used as intended. Due to the wave shape of the cooling element, the cooling element can rest against a particularly large area of ​​the outer surface of the respective round cells when used as intended, thereby achieving a particularly large contact area between the cooling element and the battery cells.

[0017] In another embodiment, the flexible cooling element is coated with a thermal compound, such as a thermal pad or a thermal adhesive. After the battery cells have been inserted and the cooling device has been filled with the cooling fluid, the cooling element expands, conforms to the battery cells, and presses the thermal compound against the battery cells. This ensures an improved mechanical and thermal connection between the battery cells and the cooling element.

[0018] The invention further relates to a motor vehicle with a traction battery comprising a plurality of battery cells. Furthermore, the traction battery comprises at least one cooling device, as already described in connection with the cooling device according to the invention. This at least one cooling device is applied to the sides of the battery cells of the traction battery, whereby these battery cells can be cooled via the cooling device.

[0019] The invention further relates to a method for mounting a traction battery of a motor vehicle, in which a plurality of cooling devices, as already described in connection with the cooling device according to the invention, are provided, the cooling devices are mounted on a base plate and then the battery cells are arranged on the base plate, wherein the battery cells are placed laterally against the cooling devices. The base plate can be a base of a housing of the traction battery or a mounting plate separate from the housing of the traction battery. The method thus involves pre-assembly of the cooling devices on the base plate and then the battery cells are inserted between pre-assembled cooling devices arranged adjacent to one another on the base plate.Because the respective cooling elements of the cooling devices are held in shape by means of the framework elements, the risk of the cooling elements becoming crumpled when the battery cells are inserted between adjacent cooling elements can be kept particularly low. By filling the cooling fluid into the respective cooling elements, the respective cooling elements lie laterally against the battery cells, whereby a particularly large heat transfer surface and consequently particularly good heat transfer from the battery cells to the respective cooling elements can be achieved. This enables particularly efficient cooling of the battery cells by means of the cooling devices. In particular, the method uses a bag-shaped cooling element made of a film which is reinforced by means of at least one framework element injection-molded or crimped onto the cooling element, whereby the mechanical stability of the cooling element can be improved.This enables a particularly simple production of a battery cell complex for the traction battery while at the same time ensuring particularly good sealing of the at least one cooling device used.

[0020] Further features of the invention may emerge from the claims, the figures, and the description of the figures. The features and combinations of features mentioned above in the description, as well as the features and combinations of features shown below in the description of the figures and / or in the figures alone, can be used not only in the respective combinations specified, but also in other combinations or on their own, without departing from the scope of the invention.

[0021] The drawing shows: Fig. 1 is a schematic perspective view of a cooling element of a cooling device for a traction battery of a motor vehicle; Fig. 2 a schematic perspective view of the cooling device with the cooling element and several framework elements holding the cooling element in shape; Fig. 3 a schematic perspective view of a battery cell complex comprising several cooling devices and several battery cells designed as round cells during an assembly process; Fig. 4 is a schematic sectional view of a section of the cooling device, wherein a framework element is crimped to the cooling element; and Fig. 5 a schematic sectional view of a section of the cooling device, wherein the at least one framework element is designed as a closure clip and closes the cooling element.

[0022] In the figures, identical and functionally identical elements are provided with the same reference numerals.

[0023] In Fig. 1 shows a flexible cooling element 10 of a cooling device 12. The associated cooling device 12 is shown in Fig. 2 and is designed to be used in a traction battery of a motor vehicle for cooling battery cells, in particular battery cells designed as round cells 14. The cooling element 10 is designed as a film tube. In the present case, this film tube is U-shaped, so that a cooling fluid can be guided in the cooling element 10 in a U-shaped manner and thus in the forward and return flow. This means that within the cooling element 10, the cooling fluid is first guided in a first direction and, after a deflection, in a second direction opposite to the first direction. The cooling fluid therefore covers a particularly long path in the cooling element 10. Alternatively, the cooling fluid can be guided in the cooling element 10 without deflection.

[0024] In Fig. 1, the cooling element 10 is shown in a shape in which the cooling element 10 is to be brought into contact with the round cells 14. Due to the flexural flexibility of the cooling element 10, the inherent rigidity of the cooling element 10 is not sufficient to hold the cooling element 10 in this shape. The shape of the cooling element 10 in which the cooling element 10 is to be held is, as shown in Fig. 1, a waveform. This waveform is defined by an extension direction 16 and an amplitude direction 18 running perpendicular to the extension direction 16. The waveform of the cooling element 10 corresponds to a transverse wave. Outside the region in which the cooling fluid is deflected, the at least one flow direction of the cooling fluid within the cooling element 10 runs along the extension direction 16.

[0025] In order to be able to hold the cooling element 10 in the described wave shape, the cooling device 12 comprises at least one framework element 20. In particular, the cooling device 12 can comprise a plurality of framework elements 20, by means of which the cooling element 10 is held in shape. The at least one framework element 20 can be designed as an injection-molded part. To stabilize the cooling element 10, the at least one framework element 20 can be injection-molded onto the cooling element 10. Alternatively, the at least one framework element 20 can be held to the cooling element 10 via a crimp connection or a clamp connection. In particular, the framework element 20 can be configured, in addition to holding it in shape, to support the cooling element 10 at a seam 22, in particular to keep this seam 22 closed in order to prevent the cooling element 10 from opening at the seam 22.In the present case, all seams 22 of the cooling element 10 are secured against opening by means of respective framework elements 20. In the present case, the respective framework elements 20 form a lattice frame by means of which the cooling element 10 is held in shape. This lattice frame surrounds the cooling element 10 in the extension direction 16 and in a vertical direction 24 running perpendicular to the extension direction 16 and perpendicular to the amplitude direction 18.

[0026] Furthermore, the cooling element 10 is supported by respective strut-shaped framework elements 20, wherein the respective strut-shaped framework elements 20 extend with their longitudinal direction in the vertical direction 24 and bear against the amplitude peaks of the waveform on the outside in the amplitude direction 18. This means that the cooling element 10 is supported by the strut-shaped framework elements 20 at the points with the greatest deflection in the amplitude direction 18.

[0027] The cooling element 10 comprises a flow region 26, a deflection region 28 adjoining the flow region 26 in the flow direction, and a return region 30 adjoining the deflection region 28 in the flow direction. The flow region 26 and the return region 30 are arranged one above the other in the vertical direction 24. In the present case, a framework element 20 is arranged in the vertical direction 24 between the flow region 26 and the return region 30 of the cooling element 10, which framework element extends over the entire length of the flow region 26 or over the entire length of the return region 30. As a result, all seams 22 of the cooling element 10 are held closed by means of respective framework elements 20.

[0028] In Fig. 3 shows several cooling devices 12, which are controlled by means of a Fig. 3 are held fixed relative to one another by a base plate not shown. This base plate can be part of the traction battery or part of a tool for pre-assembling a battery cell complex comprising the cooling devices 12 and a plurality of round cells 14. For reasons of clarity, only individual round cells 14 are provided with the corresponding reference numerals.

[0029] As in Fig. 3, for pre-assembly, the round cells 14 are inserted in the vertical direction 24 between respective directly adjacent cooling devices 12. The respective cooling devices 12 are arranged adjacent to one another in the amplitude direction 18. The round cells 14 are inserted between the cooling devices 12 with their central axis parallel to the vertical direction 24. All round cells 14 are aligned with their respective central axes parallel to one another. The central axes run in the axial direction of the respective round cells 14. In particular, the base plate provides a support surface for the cooling devices 12 and the round cells 14, wherein the support surface extends in the extension direction 16 and in the amplitude direction 18.

[0030] Because the flexible cooling elements 10 of the respective cooling devices 12 are stabilized by means of the respective framework elements 20, pre-assembly of the cooling devices 12 on the base plate is possible. The round cells 14 are then inserted into assigned insertion areas, which are kept free between adjacent cooling devices 12 in the amplitude direction 18. Due to the flexible design of the cooling elements 10, when the cooling elements 10 are filled with the cooling fluid, the cooling elements 10 rest laterally against the round cells 14 inserted into the insertion areas, thereby enabling particularly large-area contact for heat transfer from the round cells 14 to the respective cooling elements 10.As a result, heat generated by the round cells 14 during operation of the traction battery can be dissipated particularly quickly by the round cells 14, thereby minimizing the risk of overheating of the respective round cells 14 of the traction battery. The battery cell complex formed from the round cells 14 and the cooling devices 12 can be accommodated in a housing of the traction battery for the manufacture of the traction battery.

[0031] In order to enable a particularly secure holding of the respective framework elements 20 on the respective cooling elements 10 and, in addition, to ensure a particularly secure closing or keeping closed of seams 22 of the cooling element 10, there are different possibilities for fastening the respective framework elements 20 to the respective cooling elements 10.

[0032] In Fig. 4 shows a framework element 20 which is connected to the cooling element 10 via a crimp connection. As in Fig. 4, two film layers 32 of the cooling element 10 are arranged overlapping one another in the area of ​​the seam 22 of the cooling element 10. A sealing element 34 is arranged between these two film layers 32. A crimp sealing element 36 is arranged on the outside around the two film layers 32, resting against the two film layers 32. The crimp sealing element 36 is placed around respective ends of the film layers 32 and thus around the seam 22. The crimp sealing element 36 rests against the outside of both film layers 32 in some areas. The framework element 20 is placed on the outside around the crimp sealing element 36. The framework element 20 is crimped onto the film layers 32 in the area of ​​the seam 22, the seam 22 being sealed both by means of the sealing element 34 arranged between the film layers 32 and by means of the crimp sealing element 36. This means that the risk of leakage can be kept particularly low.

[0033] The cooling element 10 is thus particularly tightly and securely sealed in the area of ​​the seam 22 via the crimp connection with the framework element 20.

[0034] At the Fig. In the embodiment shown in Figure 5, the cooling element 10 is closed in the region of the seam 22 by means of a framework element 20 designed as a closure clip. Here, in the region of the seam 22, the two film layers 32 are also placed on top of one another, with the sealing element 34 arranged between the film layers 32. By means of the closure clip, respective free ends of the film layers 32 are clamped together between respective legs 38 of the closure clip. As a result, the film layers 32 are held particularly securely together. The closure clip engages around the respective free ends of the film layers 32 in the region of the seam 22. As a result, the seam 22 is held particularly securely closed by means of the closure clip.

[0035] The cooling device 12 thus combines a bag-like, inflatable cooling element with a mechanically stabilizing framework made of framework elements 20. The framework elements 20 can be manufactured by injection molding. The framework can already fix the cooling element 10 in a wave-shaped geometry and provide structural stabilization, which is necessary for the assembly of the battery cell complex. In addition, injection molding or crimping in the area of ​​the respective seams 22 can achieve a particularly high degree of tightness of the seams 22 and enable additional mechanical anchoring to achieve a particularly high degree of rigidity of the battery cell complex after the application of adhesives.

[0036] The described flexible cooling element 10 is particularly cost-effective and expands when filled with the cooling fluid, bringing the round cells 14 and the respective cooling elements 10 into contact with one another. This enables particularly simple assembly of the battery cell complex, with no adhesive being required between the cooling elements 10 and the round cells 14 for good thermal contact. Furthermore, this reduces the requirements for compliance with tolerance limits. Without the framework elements 20, the cooling element 10 could burst in the area of ​​the seams 22 at high pressures of the cooling fluid. Furthermore, the cooling element 10 alone lacks mechanical stability, which would make pre-assembly of the cooling elements 10 onto the round cells 14 difficult. Without the framework element 20, the wave shape of the cooling element 10 would only develop after the cooling element 10 has been filled with the cooling fluid.

[0037] By injection molding the at least one framework element 20 or crimping the at least one framework element 20 to the cooling element 10, a particularly high mechanical stability of the cooling device 12 can be achieved. This makes it possible for the cooling devices 12 to be preassembled on a battery cell carrier of the traction battery as a base plate. Furthermore, a particularly high degree of tightness of the cooling device 12 at the seams 22 can be achieved by injection molding the at least one framework element 20 or crimping the at least one framework element 20 to the cooling element 10.

[0038] Overall, the invention shows how a foil bag-shaped side cooler can be embedded into a structural framework to improve mechanical stability. List of reference symbols 10 Cooling element 12 Cooling device 14 round cell 16 Extension direction 18 Amplitude direction 20 scaffolding elements 22 Seam 24 Vertical direction 26 Lead area 28 Deflection area 30 return area 32 film layers 34 Sealing element 36 Crimp sealing element 38 legs QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2019 116 969 A1

[0002]

Claims

[1] Cooling device (12) for a traction battery of a motor vehicle, comprising a flexible cooling element (10) through which a cooling fluid can flow and which is designed to be applied laterally to battery cells (14) of the traction battery to be cooled, and comprising at least one dimensionally stable framework element (20) by means of which the cooling element (10) is held in shape. [2] Cooling device (12) according to claim 1, characterized by that the cooling element (10) comprises a film tube. [3] Cooling device (12) according to claim 2, characterized by that the film tube is closed by means of an injection-molded framework element (20). [4] Cooling device (12) according to claim 2, characterized by that the framework element (20) is crimped to the film tube. [5] Cooling device (12) according to claim 4, characterized bythat the framework element (20) is fastened to the film tube via a crimp connection, whereby the film tube is closed via the crimp connection. [6] Cooling device (12) according to claim 5, characterized by that the film tube is sealed at the crimp connection via a crimp sealing element (36) arranged between the framework element (20) and the film tube. [7] Cooling device (12) according to claim 2 or 3, characterized by that the framework element (20) is designed as a closure clip and closes the film tube. [8] Cooling device (12) according to one of the preceding claims, characterized by that the cooling element (10) is held in a wave-like shape by means of the framework element (20). [9] Motor vehicle, with a traction battery which comprises a plurality of battery cells (14) and at least one cooling device (12) according to one of the preceding claims, which is arranged laterally on battery cells (14) of the traction battery, whereby these battery cells (14) can be cooled via the cooling device (12). [10] Method for assembling a traction battery of a motor vehicle, in which a plurality of cooling devices (12) according to one of claims 1-8 are provided, the cooling devices (12) are mounted on a base plate and then the battery cells (14) are arranged on the base plate, wherein the battery cells (14) are placed laterally against the cooling devices (12).

Images