DE102020108270A1 - Cooling device for cooling a battery module and battery system and motor vehicle for this purpose - Google Patents

Abstract

The invention relates to a cooling device (20) for cooling a battery module (14). The cooling device (20) comprises a plurality of chambers (30a, 30b, 30c) which are delimited by a cover plate (22a) and a bottom plate (22b) and are designed so that a fluid can flow through them. Each sheet (22a, 22b) has a wave-shaped cross section which comprises several wave troughs (24a, 24b) and several wave crests (26a, 26b). To form the chambers (30a, 30b, 30c), the wave troughs (24a) of the cover plate (22a) rest on the wave crests (26b) of the base plate (22b) and are fluid-tight to one another by means of respective joints (28a, 28b, 28c, 28d) are connected. In addition, the cover plate (22a) is designed to be deformable when exposed to a predetermined operating pressure by the fluid.

Description

The invention relates to a cooling device for cooling a battery module. The present invention also relates to a battery system and a motor vehicle for this purpose.

It is generally known that a heat-generating component must be protected from overheating. For this purpose, the component can be cooled by means of a cooling device. The heat-generating component, d. H. a so-called cooling object to be cooled, in particular an electrical energy storage device. This can, for example, be part of a battery system for a motor vehicle as a battery module comprising a plurality of battery cells. The cooling device can have a cavity (for example a chamber and / or a channel) through which a cooling fluid can flow and which can be delimited by two metal sheets. In particular, a surface specified by the cooling object (e.g. a structure and / or an expression) which is to be connected to the cooling device in a thermally conductive manner as completely and uniformly as possible in order to efficiently dissipate heat can be a challenge.

For this purpose, several approaches are known from the prior art, in which one of the metal sheets can be deformed by the application of pressure and the hollow space through which a flow can be changed can thereby be changed. For example, describes the DE 10 2013 203 468 A1 for this purpose a cooling device for a battery device, which can be particularly plastically deformed by a cooling fluid when subjected to pressure. the DE 10 2013 200 774 A1 discloses a device for controlling the temperature of a battery module, wherein the device can in particular expand elastically.

Against this background, it is the object of the present invention to improve a cooling device of the type mentioned at the beginning, so that selective cooling of the battery module and in particular of the respective battery cells comprising the battery module can be provided.

The object is achieved by the subjects of the independent claims. Advantageous developments of the invention are described by the dependent claims, the following description and the figures.

The invention provides a cooling device for cooling a battery module. The cooling device is preferably designed to dissipate heat and thereby reduce a temperature of the battery module. In this context, however, temperature control of the battery module can also be understood, which under certain circumstances also includes increasing or maintaining a predetermined temperature of the battery module. The cooling device comprises a plurality of chambers which are delimited by a cover plate and a bottom plate and are designed so that a fluid can flow through them. The cooling device thus has at least two chambers, the chambers being spatially closed off from the outside by two metal sheets. The cover sheet is that of the sheets that is to be connected to the battery module in a thermally conductive manner. The floor panel is that of the panels which, when the cooling device is arranged, is positioned on a side opposite the battery module. In particular, flat rolled products made of a metal and / or a metal alloy, in particular aluminum and / or an aluminum alloy, can be used as sheets in the sense of the invention. Alternatively or additionally, at least one of the sheets can also be used as a non-metallic material, e.g. B. a plate-shaped plastic are present. In particular, the sheet metal thickness of the cover sheet can be between 0.1 and 0.7 millimeters and / or the base sheet between 0.5 and 1.0 millimeters. Each chamber can have a cavity, i. H. a so-called hollow volume, into which the fluid flows in via an inlet downstream and flows out via an outlet upstream. Advantageously, each of the chambers has its own fluid circuit and can thereby be selectively traversed. For example, the circulating fluid can be a production fluid and / or a cooling fluid. In particular, the fluid can be present as a liquid (for example water, oil or a water-glycol mixture) and / or as a gas (for example air or carbon dioxide).

To form the plurality of chambers, each sheet metal has a wave-shaped cross section which comprises several wave troughs and several wave crests. The cross section has an apex at a transition from wave trough to wave crest and vice versa. The vertices lie on one axis, for example along the x direction. Starting from this axis, there are two oppositely oriented maximum deflections which are arranged orthogonally to the axis, i.e. a respective crest of the positive, i.e. upwardly oriented wave crest (opposite to the z-direction) or of the negative, i.e. downwardly oriented wave trough ( in z-direction). The wave-shaped cross section can have a flexible form and can be configured, for example, sinusoidal (corrugated sheet) and / or trapezoidal (trapezoidal sheet). In one installation position, the two sheets are arranged in relation to one another in such a way that the corrugation troughs of the cover sheet rest on the corrugation peaks of the base sheet. Thus, the two axes of the two sheets are parallel to each other and the wave crests of the Bottom plate serve as a support for the corrugation troughs of the cover plate. The two metal sheets are connected to one another in a fluid-tight manner, ie in a respective contact area, by means of respective joint connections, so that the multiple chambers are formed. The respective joining connection can, for example, have several forming joining elements (e.g. rivets) and / or clinching joining elements (e.g. clinch rivets). Alternatively or additionally, the two metal sheets can also be welded, glued and / or soldered to one another. Advantageously, the joint connections prevent an undesired escape of the fluid from the chambers.

The cover plate is designed to be deformable by the fluid when it is subjected to a predetermined operating pressure. Starting from a pressure state without stress, a shape of the cover plate can change in a pressure state with stress, so that, for example, a flow cross section changes, i. H. enlarged or reduced. The presettable operating pressure can be between 0.5 and 3.0 bar, for example. In particular in connection with the fluid designed as a cooling fluid, the operating pressure can be 0.5 to 1.5 bar. The operating pressure can be present as negative or positive pressure. A deformation resulting therefrom can comprise elastic and / or plastic components, i. H. be reversible and / or irreversible. Compared to the cover plate, the bottom plate can be equally and / or less deformable under the same stress. In particular, the floor panel can also be rigid, i. H. be dimensionally stable against the stress in the above-mentioned pressure range.

The invention is based on the advantage that the cooling device, which is flexible in shape and design, can be implemented with only two metal sheets. Each of the chambers can have its own fluid circuit, so that by selectively filling the respective chambers, different cooling / heating requirements between several chambers can be addressed in a targeted manner. This means that all chambers can be flown through as required. As a result, the fluid can flow through the respective chambers differently, but nevertheless provide balanced cooling for individual battery cells of the battery module. The cooling device can thus form a self-contained and leak-proof cooling system.

An advantageous embodiment provides that a damping layer is arranged at least partially on the base plate on an outside opposite the cover plate. Thus, the damping layer is applied to the outside of the cover plate, i. H. positioned. This can be part of the outside, i. H. cover these partially or all of the outside, d. H. be attached over the entire surface. The outer side is the side of the floor panel that delimits the chambers towards the outside, in relation to the surroundings. The damping layer can preferably absorb an impact, i.e. an impact, for example in connection with an impact (crash), i.e. an impact. H. compensate. In this way, in particular, the integrity of the cooling device and the battery module arranged thereon can also be maintained in the event of operating and / or impact loads. The damping layer can additionally or alternatively be designed as an insulating layer to shield the cooling device from the environment and vice versa. Preferably, a heat / cold transfer can be prevented due to a reduced thermal conductivity, i. H. are insulated and thus the cooling device can be operated particularly efficiently. Additionally or alternatively, a mutual electrical and / or magnetic and / or electromagnetic shielding, d. H. Be realized attenuation. In particular, there can be insulation against resonance frequencies, vibrations and / or sound. The damping layer can be designed, for example, as a foam material and / or a composite material. A respective material can in particular have a cell structure and / or a low density. In addition, the insulating material can have a low stiffness and / or can at least be deformed (plastically and / or elastically) during application. The foam material can, for example, be thermoplastic foams (e.g. expansion foams based on polystyrene, polypropylene and / or polyvinyl chloride), elastomeric foams (e.g. flexible polyurethane foam and / or nitrile rubber) and / or thermoset foams (e.g. B. rigid polyurethane foam and / or phenoplastics) act. The composite material can, for example, comprise functional fibers and a matrix (e.g. filler and / or adhesive) that embeds the fibers. In particular, the composite material can be designed as a fiber-plastic composite, it being possible, for example, to use selected plastics from those listed above in connection with the foam material as the matrix.

A further advantageous embodiment provides that a base plate, the cross section of which is similar in shape to the wave-shaped cross section of the base plate, is arranged on the base plate via the damping layer. The two metal sheets are thus connected to one another via the damping layer in a sandwich construction, ie a layer construction. In this case, the damping layer can provide a core material which, for example, arranges the two metal sheets from one another at a defined distance and / or a predetermined spacing profile. The damping layer can thus also serve as a spacer element. In particular, a maximum value of the distance and / or the distance profile is less than 0.1 to 0.5 Millimeter. The damping layer insulates and / or dampens the base plate and the base plate from one another. Thus, the two sheets are mutually decoupled from one another. In this way, for example, a mass transfer (e.g. heat and / or cold) from the base plate to the base plate and vice versa can be limited or prevented. The base plate can be made from the same material or a different material from the base plate. In particular, the base sheet can have a sheet thickness between 0.8 and 1.2 millimeters. The base plate can be present as an independent component, as a result of which the cooling device can also be arranged on the battery module at a later date, for example when the battery module is recognized as requiring cooling. Alternatively or additionally, the base plate can also be provided by a further component, in particular a battery system and / or a motor vehicle. The base plate preferably has an increased mechanical strength compared to the base plate. The base plate is thus designed to absorb a force that is generally applied to the base plate from the environment, in particular an acting compressive force. Thus, a protective layer (armoring) of the cooling device and in particular for the respective chambers can be implemented through the base plate, whereby these are protected from such a force. A resistance force of the base plate can result from a point effect of the force from its material strength (e.g. material hardness and / or stability) and / or from an areal effect of the force from its structural structure (e.g. curvature, embossing and / or or bead). Due to the damping layer, which as a compensating element can compensate for potential structural differences between the two metal sheets on mutually facing sides, coordination and / or adaptation of a respective structural structure, ie a contour, can be dispensed with. Thus, for example, at least one of the metal sheets can have a respective bead geometry and, alternatively or additionally, both metal sheets, wherein these can match or be different from one another. In this case, the damping layer can in particular also compensate for a manufacturing-related component tolerance and thus the metal sheets can be manufactured in a cost-effective manner.

An advantageous embodiment provides that the base plate is attached to the base plate by means of the joint connections. Thus, by means of the joint connections, all of the sheets (i.e. cover sheet, floor sheet and base sheet) can be positioned against one another. This results in the advantage that additional joint connections can be dispensed with in order to connect the base plate to the base plate. Furthermore, due to such a layered structure, the cooling device can be designed as a multi-layer sheet metal, and the stiffness of the cooling device can be increased by arranging the base plate.

An advantageous embodiment provides that the base plate and / or the base plate is pretreated on a respective contact surface for the damping layer in order to improve adhesion of the damping layer. Thus, the respective (future) contact surface is processed before the damping layer is applied. In this context, a pretreatment is understood to mean, in particular, a surface pretreatment. A surface property of the respective contact area can be functionally changed. For this purpose, for example, mechanical (e.g. grinding, blasting, rolling), metallurgical (e.g. laser, electron beam alloying), chemical (e.g. degreasing, pickling), electrochemical (e.g. anodizing, galvanizing) and / or physical (e.g. painting, sintering) methods for surface treatment are used. This has the advantage that the liability, i. H. a connection of the damping layer to the respective contact surface can be increased by the pretreatment.

An advantageous embodiment provides that two of the chambers are delimited by three straight, parallel joint connections. All joints are therefore in one plane without intersecting each other. Thus, the two of the chambers also extend parallel to one another. In particular, two of the joint connections can be arranged on respective mutually opposite parallel sheet metal edges. Another of the joint connections can be positioned between them in such a way that it delimits the two of the chambers. This results in the advantage that the cooling device can be designed to be particularly compact by means of the two of the chambers.

A battery system is also provided by the invention. The battery system comprises a battery module with a plurality of battery cells, an embodiment of the cooling device according to the invention for cooling the battery module and a battery housing for receiving the battery module and the cooling device. A battery module within the meaning of the invention comprises a battery cell or a plurality of battery cells, each of which can be configured, for example, as a prismatic cell or as a pouch cell. Such a battery cell preferably provides a voltage in the range between 3.5 and 4 volts. In particular, the battery module has a multiplicity of battery cells electrically interconnected with one another. As a result, an electrical voltage in the range of more than 60 volts, in particular in the range of several 100 volts, can be provided. The battery cells are preferably arranged next to one another to form at least one cell stack and are surrounded by a module housing encased. One or more such battery modules can in turn be arranged in the battery housing of the battery system. If the battery module is used, for example as a drive energy store for a motor vehicle, then there is lost heat which has to be dissipated from the battery module by means of the cooling device. The cooling device is preferably arranged within the battery housing in such a way that it is positioned between the side walls forming the battery housing and the battery module arranged therein. The battery housing can thus enclose the battery module and the cooling device. The battery housing can in particular be made of a metallic material, for example steel and / or aluminum. Such a configuration of the battery system has the advantage that the battery module can achieve an expected service life due to efficient cooling of the respective battery cells. By adapting the cover plate to the battery module to be cooled, it is possible, for example, to dispense with an expensive heat-conducting material to be arranged between the cover plate and the battery module or to reduce an amount thereof. In this way, the battery system can advantageously be provided in a particularly cost-effective manner. The thermally conductive material can be, for example, a low-viscosity and hardening two-component thermally conductive material or a highly viscous one-component thermally conductive material. The heat-conducting material can be designed as a so-called thermal gap filler, in particular as a heat-conducting paste (thermal grease) or a heat-conducting pad (thermal pad).

An advantageous embodiment provides that a base plate of the cooling device is part of the battery housing. The cooling device is thus integrated into the battery housing. In particular, a base of the battery housing, on which the battery module rests in the installed position, can be designed in several parts and have the base plate. This reduces the number of components, so that the battery system is available in a space-optimized manner. Furthermore, a stationary arrangement of the cooling device within the battery housing can thereby be implemented in a particularly simple manner. As an alternative or in addition, all components of the cooling device, for example a cover plate and a base plate as well as respective joint connections, can also be parts of the battery housing.

The invention also includes further developments of the battery system according to the invention which have features as they have already been described in connection with the further developments of the cooling device according to the invention and vice versa. For this reason, the corresponding developments of the battery system according to the invention are not described again here.

The invention also provides a motor vehicle with an embodiment of the battery system according to the invention. The embodiment of the battery system according to the invention can supply the motor vehicle electrically and, in particular, drive it electrically. The motor vehicle is preferably designed as a motor vehicle, in particular as a passenger vehicle or truck, or as a passenger bus or motorcycle.

The invention also includes further developments of the motor vehicle according to the invention which have features as they have already been described in connection with the further developments of the battery system according to the invention and vice versa. For this reason, the corresponding developments of the motor vehicle according to the invention are not described again here.

The invention also includes the combinations of the features of the described embodiments.

• 1 eine schematische Darstellung eines Kraftfahrzeugs mit einem Batteriesystem;
• 2 eine schematische Perspektivdarstellung einer Kühlvorrichtung für ein Batteriemodul; und
• 3 ausschnittsweise eine Schnittdarstellung der Kühlvorrichtung.

Exemplary embodiments of the invention are described below. This shows:

• 1 a schematic representation of a motor vehicle with a battery system;
• 2 a schematic perspective view of a cooling device for a battery module; and
• 3 a detail of a sectional view of the cooling device.

The exemplary embodiments explained below are preferred embodiments of the invention. In the exemplary embodiments, the described components of the embodiments each represent individual features of the invention which are to be considered independently of one another and which also further develop the invention in each case independently of one another.

Therefore, the disclosure is intended to include combinations of the features of the embodiments other than those shown. Furthermore, the described embodiments can also be supplemented by further features of the invention that have already been described.

In the figures, the same reference symbols denote functionally identical elements.

the 1 shows schematically a motor vehicle 10 with a battery system 12th for the electrical supply of the motor vehicle 10 . The battery system 12th a battery module can do this 14th have that a plurality of electrically interconnected battery cells 16 have and from a battery case 18th can be sheathed. To the battery module 14th to temper, in particular to the battery system can cool 12th a cooling device 20th have, which, as indicated schematically, also part of the battery housing 18th can be.

the 2 shows with reference to those relating to 1 components already described an embodiment of the cooling device 20th for cooling the battery module 14th . For the sake of clarity, the 2 functionally identical elements are provided with a reference symbol only once. The cooler 20th includes a cover plate 22a , a floor pan 22b . Every sheet 22a , 22b has a wave-shaped cross-section, the several wave troughs 24a , 24b and several wave crests 26a , 26b includes. There are four wave troughs here 24a of the cover plate 22a on four wave crests 26b of the floor pan 22b and are connected to each other by means of four respective joint connections 28a , 28b , 28c , 28d (hereinafter referred to as 28a-28d designated) fluid-tight connected. The joint connections 28a-28d are arranged in a straight line in the y-direction and parallel to each other. Three wave crests 26a of the cover plate 22a as well as three wave troughs 24b of the floor pan 22b limit three chambers 30a , 30b , 30c (hereinafter referred to as 30a-30c designated). Each of the chambers 30a-30c is designed so that it can flow through for a fluid, for example a cooling fluid. The chambers 30a-30c are thus from the cover plate 22a , the floor pan 22b and the joints 28a-28d limited. This includes the respective one of the joint connections 28a-28d a large number of clinch rivets each. The two external joints 28a , 28d are on opposite sheet metal edges of the two sheets 22a , 22b and the two internal joints 28b , 28c arranged in between.

The cover sheet 22a is designed to be deformable by the fluid when subjected to a predetermined operating pressure. This can cause the cover plate 22a for example, in the case of overpressure, in particular in the direction of the battery module arranged thereon 14th (see the schematic in the 1 arrangement shown) and contract in the opposite direction when there is negative pressure.

On one of the cover plates 22a opposite outside 32 of the floor pan 22b can be a cushioning layer 34 be arranged over which a base plate 22c on the floor pan 22b can be arranged. A cross section of the base plate 22c can be similar in shape to the wave-shaped cross-section of the floor pan 22b be. By means of the damping layer 34 , which can also be referred to as an insulating layer, can be the floor panel 22b and the base plate 22c mutually damped and / or isolated from one another. Each of the four wave troughs can be used here 24b of the floor pan 22b over the damping layer 34 with a respective one of three wave troughs 24c of the base plate 22c be connected and each of the four wave crests 26b of the floor pan 22b directly on one of four wave crests 26c of the base plate 22c rest.

the 3 shows with reference to those in connection with the 1 and the 2 Components already described in a sectional view III-III the chamber 30b the in 2 shown embodiment of the cooling device 20th . The chamber 30b is in the x-direction of clinch rivets of the two joint connections 28b , 28c and in the z-direction from the cover plate 22a and the floor pan 22b limited. To ensure adhesion of the damping layer 34 at a respective contact surface 36b , 36c for the damping layer 34 to improve are the floor pan 22b and the base plate 22c pretreated, for example roughened.

An embodiment of the cooling device known from the prior art 20th can have a variety of chambers 30a , 30b , 30c each having the same cross section and each having different lengths. This allows the chambers 30a , 30b , 30c be differently flowed through by the cooling fluid. Setting a balanced flow of cooling fluid is a particular challenge here. Another disadvantage can be that it is rigid with the battery housing 18th can be connected. As a result, no energy can be dissipated in the event of a load caused by a crash, for example. In addition, a so-called “crash part”, ie another component of the motor vehicle 10 or a non-vehicle component, through the cooling device 20th penetrate through. This allows the cooling device 20th become defective and the cooling fluid can leak in an uncontrolled manner, ie undefined, and possibly cause a short circuit. The cooling device 20th a structural rigidity of a bottom of the battery case 18th reduce and increase its weight, since a weight-optimized lightweight construction is to be dispensed with. Because the floor pan, which is usually made of aluminum 22b is uninsulated from an environment, the cooling device 20th For example, at low ambient temperatures (e.g. in winter), it is additionally cooled and increases energy loss. In addition, there is a compensation of component tolerances, for example of the cover plate 22a and the battery module 14th only possible using an expensive heat-conducting material (gap filler).

The battery system 12th can have a multi-part bottom of the battery housing 18th including cooling device 20th and compensation element (damping layer 34 ) include. The cooler 20th (Cooling system) is self-contained and has, for example, two deformed metal sheets 22a , 22b that can be tightly welded. The floor pan 22b can on the cushioning layer 34 (Compensation / spacer element) partially or completely. The cushioning layer 34 can, for example, be in the form of a plastic, a foam or an adhesive (adhesive bead) and have a lower stiffness than the metal sheets 22a , 22b , 22c exhibit. Below the damping layer 34 , ie in the z-direction, the base plate can 22c be arranged as the bottom of the battery case 18th can be formed. The base plate 22c can have a special contour created by a cooling structure of the floor pan 22b may differ. Alternatively or additionally, parts of the base plate 22c correspond to the cooling structure. In addition, such a layer structure can be built up with connecting elements (joint connections 28a-28d ) connected to generate a rigid plate. For example, they can have several rivets, spot welds and / or clinches.

This has the advantage that the cooling device 20th from the base plate 22c (Housing bottom) can be separated and thus have improved damage tolerance. The cooling device 20th be acoustically and / or vibrationally decoupled. In addition, it can also be thermally insulated, as the damping layer 34 (Coupling layer) can have a low thermal conductivity. This can prevent heat flow into the environment. This can lead to improved efficiency of the cooling device 20th to lead. One through the base plate 22c increased rigidity can improve impact properties in the event of an impact (crash). There can also be tolerances between the base plate 22c and floor pan 22b by means of the damping layer 34 be compensated, making these sheets 22b , 22c can be produced more cheaply. In particular, a respective bead geometry can at least partially differ from one another. All sheets 22a , 22b , 22c can be partially connected to one another, thereby increasing the rigidity of the cooling device, which has a multilayer composite (sandwich) 20th can be increased. The cooling device 20th on the heat conducting material between the cover plate 22a and battery module 14th waive.

Overall, the examples show how a decoupled multilayer cooling system (cooling device 20th ) can be provided.

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102013203468 A1 [0003]
• DE 102013200774 A1 [0003]

Claims (10)

Cooling device (20) for cooling a battery module (14), comprising - Several chambers (30a, 30b, 30c) which are delimited by a cover plate (22a) and a bottom plate (22b) and are designed so that a fluid can flow through them, - Each sheet (22a, 22b) has a wave-shaped cross section which comprises several wave troughs (24a, 24b) and several wave crests (26a, 26b), wherein - The wave troughs (24a) of the cover plate (22a) rest on the wave crests (26b) of the base plate (22b) and are connected to one another in a fluid-tight manner by means of respective joint connections (28a, 28b, 28c, 28d), so that the several chambers (30a, 30b, 30c) are formed, wherein - The cover plate (22a) is designed to be deformable by the fluid when it is subjected to a predetermined operating pressure. Cooling device (20) after Claim 1 wherein a damping layer (34) is arranged at least partially on the base plate (22b) on an outer side (32) opposite the cover plate (22a). Cooling device (20) after Claim 2 , wherein a base plate (22c), the cross section of which is similar in shape to the wave-shaped cross section of the floor plate (22b), is arranged over the damping layer (34) on the floor panel (22b), the damping layer (34) the floor panel (22b) and the Base plate (22c) mutually decoupled from one another. Cooling device (20) after Claim 3 , each corrugation trough (24b) of the base plate (22b) being at least partially connected via the insulating layer (34) to a respective corrugation trough (24c) of the base plate (22c), and each wave crest (26b) of the base plate (22b) directly on a respective one Wave crest (26c) of the base plate (22c) rests. Cooling device (20) after Claim 3 or 4th wherein the base plate (22c) is attached to the base plate (22b) by means of the joint connections (28a, 28b, 28c, 28d). Cooling device (20) according to one of the Claims 3 until 5 wherein the base plate (22c) and / or the bottom plate (22b) is pretreated on a respective contact surface (36b, 36c) for the damping layer (34) to improve adhesion of the damping layer (34). Cooling device (20) according to one of the preceding claims, two of the chambers (30a, 30b, 30c, 30d) being delimited by three straight, parallel joints (28a, 28b, 28c, 28d). A battery system (12), comprising - a battery module (14) with a plurality of battery cells (16), - a cooling device (20) for cooling the battery module (14) according to one of the Claims 1 until 7th and - a battery housing (18) for accommodating the battery module (14) and the cooling device (20). Battery system according to Claim 8 with reference to Claim 3 , wherein the base plate (22c) of the cooling device (20) is part of the battery housing (18). Motor vehicle (10) with a battery system (12) according to one of the Claims 8 until 9 .

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