DE102019131820A1 - Method for producing a battery, a battery and a motor vehicle with a battery - Google Patents

Abstract

The invention relates to a method for producing a battery (10), comprising a battery housing and a plurality of battery modules (12). At least one respective battery module (12) is mounted on a base (14) of the battery housing, forming at least one space (20) extending between the base (14) and the at least one respective battery module (12). A heat-conducting fluid (24) is introduced into the space (20). An introduction pressure (26) and / or a viscosity of the heat-conducting fluid (24) is set in such a way that the base (14) is deformed at least in some areas during introduction to form a bulge (30), whereby the space (20) in the region of the bulge (30) is widened to a reservoir for the heat-conducting fluid (24). Finally, a predetermined distribution pressure counteracting the introduction pressure (26) is applied to the base surface (14), whereby the space (20) narrows in the area of the bulge (30) and the heat-conducting fluid (24) starting from the area of the bulge (30) along the Intermediate space (20) is distributed.

Description

The invention relates to a method for producing a battery, the battery having a battery housing and a plurality of battery modules arranged in an interior of the battery housing. The invention also relates to a battery and a motor vehicle with such a battery.

A battery within the meaning of the present invention is in particular what is known as a high-voltage battery, as is preferably used in at least partially electrically driven motor vehicles to provide electrical drive energy. Such a high-voltage battery usually comprises a large number of battery modules within which battery cells are electrically interconnected in such a way that a voltage in the range of more than 60 volts, in particular several hundred volts, can be provided by the battery. In order to be able to dissipate heat that develops when such a battery is electrically charged and / or when power is called up from such a battery, a temperature control unit is generally used. Such a temperature control unit can, for example, be in the form of a cooling floor which can form part of a battery housing. In order to establish or improve a thermal connection between the battery and the temperature control unit, a heat-conducting compound or paste or a heat-conducting fluid is generally used, which thermally couples the battery modules of the battery and the temperature control unit with one another. The heat transfer media used (heat transfer compound or paste or heat transfer fluid) are generally at least partially flowable below an ambient temperature of 10 to 30 ° C., which ensures that they can be processed.

Various methods for processing or applying such a heat-conducting medium or heat-conducting fluid are known. In the known methods, a fundamental distinction can be made between those methods that provide for the application of the heat-conducting fluid prior to assembly of the respective battery modules and those methods that provide for the application of the heat-conducting fluid during and / or after assembly of the battery modules. When applying the heat-conducting fluid prior to the assembly of the respective battery modules, there is the disadvantage that the battery modules have to be pressed into or onto the respective heat-conducting fluid under high pressure in order to achieve uniform wetting of a surface area of the temperature control unit provided for this purpose. On the one hand, this is time-consuming and, on the other hand, it is mechanically stressful for the battery modules. In the known methods, which provide for the application of the heat-conducting fluid during and / or after insertion or assembly of the respective battery modules, the difficulty arises in distributing the respective heat-conducting fluid evenly in a resulting space between the respective battery modules and a respective temperature control unit.

To simplify such a distribution process, the DE 10 2018 101 543 A1 propose to apply a high-frequency mechanical vibration to a heat-conducting medium. This reduces the viscosity of the heat-conducting medium, which enables it to be distributed over the entire surface in an even, thin layer. This disadvantageously requires the provision of a device for generating said high-frequency oscillation. In addition, this oscillation can also have a disadvantageous effect on the battery modules and / or other components of the battery.

The DE 10 2013 220 690 A1 also describes a manufacturing method for a battery. Here, an electrically insulating heat-conducting compound is applied to a base of a respective battery module or cell stack.

The heat-conducting compound applied to the bottom of the cell stack can be distributed and shaped by means of a stamp and in particular under pressure. The known method described is disadvantageously particularly time-consuming and also places high demands on the mechanical strength of the components involved.

The DE 10 2017 116 420 A1 describes the introduction of a heat conducting medium through a line to a cavity in a battery arrangement. In this case, the line is at least partially provided by a heat exchanger plate of the battery arrangement. The disadvantage here is that the heat-conducting medium has to be introduced at several points in order to ensure uniform distribution. This requires a high level of design effort and is also time-consuming.

The invention is based on the object of providing a material-saving and time-efficient method for applying a heat-conducting fluid for a battery of the type described at the outset.

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

The invention provides a method for manufacturing a battery. The battery has a battery case and a plurality of in an interior of the battery housing arranged on battery modules. First, the battery housing and the large number of battery modules are provided. At least one of the plurality of battery modules is mounted on a base surface of the battery housing, with at least one gap being formed between the base surface and the at least one battery module. In other words, when the at least one battery module is mounted, an interspace is created that extends between the base area and the at least one battery module. The at least one intermediate space is preferably designed as a gap with a nominal gap height of 0.5 to 2 mm, in particular 1 mm. The target gap height can vary due to manufacturing tolerances of the at least one battery module and / or the battery housing. For example, the battery module can be fastened to the base surface by means of fastening elements, with a dimension of a respective fastening element causing the gap to be created. In addition, at least one runner is provided in the battery housing. The sprue channel is preferably arranged at the end of the at least one battery module. For example, the sprue channel can be formed within a plate (end plate) arranged at the end of the battery module. Finally, a heat-conducting fluid is introduced into the intermediate space through the at least one sprue channel. The heat-conducting fluid is therefore preferably designed to be flowable.

According to the invention, an inlet pressure and / or a viscosity of the heat-conducting fluid is set in such a way that the base surface is deformed at least in some areas within a predetermined desired deformation range while the heat-conducting fluid is being introduced, with the formation of a bulge, as a result of which the space in the area of the bulge becomes a reservoir for the heat-conducting fluid is widened. The inlet pressure is preferably set in a range between 3.5 and 5 bar, in particular 4 bar. During the introduction or during the introduction process, the gap thus forms a bulge or bulge or bubble due to the deformation of the base area. When the bubbles form, the base area can bulge by several millimeters, in particular by more than 3 mm, compared to the specified gap height of the gap. The heat-conducting fluid initially collects in the bubble or reservoir thus formed.

The reservoir is preferably formed in an area of the base area opposite the sprue channel. In the event that the sprue channel is formed in the abovementioned end plate, the reservoir is thus formed in an area of the base area opposite the end plate. The targeted formation of the reservoir in this area can be supported, for example, by the fact that the predetermined desired deformation area is structurally and / or materially weaker than the base area in an area opposite the sprue channel. The bubble or bulge described can of course only form if the base area is not supported in any other way, in particular from the outside, during introduction. It is therefore deliberately avoided to mechanically stabilize or support the base area, for example by means of a counter-holder that rests on the base area over the entire area.

In a further method step, which can at least partially overlap in time with the introduction, a predetermined distribution pressure counteracting the introduction pressure is applied to the base area. This narrows the gap in the area of the bulge and distributes the heat-conducting fluid, starting from the area of the bulge, out of the reservoir and along the gap. In other words, the heat-conducting fluid is displaced out of the reservoir by the distribution pressure and is thus distributed along the intermediate space. The bulge is leveled and the base area is deformed back in the area of the bulge in such a way that the above-mentioned target gap height of the gap is set again along the entire base area or along a predominant part of the base area.

The bulge described temporarily increases a volume of the space. This advantageously reduces a pressure within the space. This enables faster introduction and / or introduction with a higher volume flow of the heat-conducting fluid without exceeding a permissible total pressure. With the method according to the invention, the assembly time can advantageously be shortened compared to the known method without additional structural effort. Because a permissible total pressure is not exceeded, the method according to the invention is also gentle on the material with regard to the battery modules.

The invention also includes embodiments which result in additional advantages.

The described distribution of the heat-conducting fluid therefore preferably takes place starting from the area of the bulge. This is logical in so far as the bulge forms the reservoir for the heat-conducting fluid. According to an advantageous embodiment, the distribution pressure is applied in a directed manner in such a way that the heat-conducting fluid, starting from the area of the bulge, in particular starting from an edge area of the bulge, out of the reservoir along the gap is distributed. In other words, the at least one battery module has a longitudinal extension axis, a transverse extension axis and a depth extension axis, the named axes preferably being essentially at right angles to one another. The axis of longitudinal extension and the axis of transverse extension preferably run essentially parallel to the base area. In other words, the longitudinal and transverse axes of extension span an imaginary plane that runs parallel to the base area. The depth extension axis is perpendicular to this imaginary plane. The heat-conducting fluid is preferably distributed in the intermediate space, starting from the region of the bulge from the reservoir, along the longitudinal axis and / or along the transverse axis of the at least one battery module.

The at least one intermediate space preferably has a ventilation opening. The heat-conducting fluid is preferably distributed in the direction of the at least one vent opening of the interspace, a pressure gradient directed towards the vent opening within the interspace supporting the distribution of the heat-conducting fluid. A pressure of 3.5 to 5.5 bar, in particular 4 bar, which is higher than ambient pressure, preferably prevails in a sprue area or in an area of the base area opposite which the sprue channel opens into the intermediate space. In contrast, there is preferably in the area of the at least one ventilation opening a pressure corresponding to the ambient pressure of, as a rule, 1 cash before. This pressure gradient, which can also have a supporting effect during the introduction or during the injection process, enables the heat-conducting medium to be distributed largely without resistance along the intermediate space.

According to an advantageous development, the intermediate space is delimited and sealed at least in sections by at least one sealing element arranged between the base area and the respective battery module. The sealing element advantageously ensures that the heat-conducting fluid can only be distributed within the region of the space delimited by the sealing element. In addition, the sealing element can preferably distance the respective battery module from the base area and thus at the same time ensure that a minimum required gap is maintained or that the desired gap height is maintained as the minimum gap height.

One embodiment provides that the distribution pressure is applied by means of a roller which, starting from the area of the bulge, is rolled along the base area. In other words, the bulge can be rolled out by means of a roller or a roller. In the event that the bulge is formed in an area of the base that is opposite an end area of the respective battery module, the heat-conducting fluid can be distributed or rolled out particularly easily along the battery module in the space by means of the roll-out mentioned above.

An alternative embodiment provides that the distribution pressure is applied by means of a plate which is pivotably mounted by means of a joint, the plate being pivoted or folded onto the base surface starting from the area of the bulge. As a result of the folding plate, the bulge is leveled along the base. The distribution pressure is gradually applied to the base, with the plate and base making initial contact in the area of the joint. As a result of the folding, the distribution pressure is then successively applied to other areas of the base area.

According to a further alternative embodiment, the distribution pressure is applied by means of a multiplicity of punches, the punches being pressed one after the other and starting from the area of the bulge against the base surface. In other words, not a single stamp is used, but a large number of stamps, which are gradually pressed against the bulge.

The invention also relates to a battery having a battery housing and a plurality of battery modules arranged in an interior of the battery housing. In this case, at least one respective battery module from the plurality of battery modules is arranged on a base surface of the battery housing with the formation of at least one intermediate space extending between the base surface and the at least one respective battery module. A runner connects the at least one intermediate space with an outer space of the battery. The at least one intermediate space contains a heat-conducting fluid conducted through the sprue channel.

According to the invention, the base area has a predetermined desired deformation area with at least one material-related and / or structurally related weakness zone. A mechanical rigidity of the base area in the area of the at least one weak zone is set in relation to a mechanical rigidity of the at least one respective battery module in such a way that, under the action of a predetermined introduction pressure and / or with a predetermined viscosity of the heat-conducting fluid, only a deformation of the base area within the predetermined target value -Deformation area takes place. In other words, it is omitted a deformation of other components, such as the battery modules themselves. The deformation of the base area provides a bulge as a reservoir for the heat-conducting fluid. The predetermined inlet pressure is preferably in the range between 3.5 and 5.5 bar, in particular 4 bar.

According to the invention, the base surface is designed to be narrowed under the action of a predetermined distribution pressure counteracting the inlet pressure with at least partial displacement of the heat-conducting fluid from the reservoir into the space in the area of the bulge.

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

A particularly preferred embodiment of the battery provides that the base is designed as a temperature control base and has temperature control medium channels through which a temperature control medium can flow, the temperature control base being thermally coupled to the respective battery module by means of the heat-conducting fluid contained in the intermediate space. This results in a particularly effective heat transfer from the battery modules to the temperature control medium.

In addition, the invention also includes a motor vehicle with a battery according to the invention.

The motor vehicle according to the invention 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 the combinations of the features of the described embodiments.

• 1 eine schematische Darstellung einer Batterie mit zumindest einem Batteriemodul;
• 2 eine schematische Darstellung des zumindest einen Batteriemoduls und einer walzenförmigen Verteilvorrichtung;
• 3 eine schematische Darstellung des zumindest einen Batteriemoduls und einer Verteilvorrichtung in Form einer Platte;
• 4 eine schematische Darstellung des zumindest einen Batteriemoduls und einer Verteilvorrichtung, umfassend eine Vielzahl an Stempeln; und
• 5 eine schematische Darstellung eines Verfahrens zum Herstellen einer Batterie.

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

• 1 a schematic representation of a battery with at least one battery module;
• 2 a schematic representation of the at least one battery module and a roller-shaped distribution device;
• 3rd a schematic representation of the at least one battery module and a distribution device in the form of a plate;
• 4th a schematic representation of the at least one battery module and a distribution device, comprising a plurality of stamps; and
• 5 a schematic representation of a method for producing a battery.

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 also intended to include combinations of the features of the embodiments other than those illustrated. Furthermore, the described embodiments can also be supplemented by further features of the invention already described.

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

1 shows a schematic representation of a battery 10 . The battery 10 the 1 includes, for example, at least one battery module 12th , which on a base 14th an unspecified battery housing of the battery 10 is arranged. The battery case and especially the base 14th can be formed from a metallic material, preferably from an aluminum alloy (3000 aluminum). The base 14th can preferably be cohesively connected to the side walls of the battery housing, which are not described in more detail here. The base area is preferred 14th as a temperature control floor 16 the battery 10 designed. As such, the base area 14th preferably not described in detail here by a temperature control medium flow through temperature control medium channels.

The battery module 12th the 1 is from the base area 14th by respective sealing elements 18th spaced. This results in a gap 20th between the base 14th and an underside of the battery module 12th . The 1 also shows schematically a runner 22nd through which a heat-conducting compound or a heat-conducting fluid identified by hatching 24 in the space 20th can be initiated. An introduction pressure is applied during introduction 26th on the heat transfer fluid 24 upset. The discharge pressure 26th and / or a viscosity of the heat-conducting fluid 24 are set as described above in such a way that the base area 14th during the introduction of the heat-conducting fluid 24 at least in some areas within a predetermined target deformation range 28 with the formation of a bulge 30th is deformed. As can be seen from the schematic representation of the 1 can be seen, this forms a reservoir for the heat-conducting fluid 24 , within which the heat transfer fluid 24 initially collects.

With reference to the related to 1 designated and described components shows 2 schematically the application of one of the inlet pressure 26th counteracting predetermined distribution pressure on the base 14th . In the schematic representation of the 2 the distribution pressure is exemplified by a roller or roller 32 configured distribution device applied. The roller 32 rotates for this purpose, for example, counterclockwise and moves along a longitudinal direction x of the battery module 12th away. As a result, the heat-conducting fluid located in the reservoir becomes 24 squeezed or rolled out of the reservoir and along the longitudinal direction x within the space 20th distributed.

With reference to those relating to the 1 and 2 designated and described components shows 3rd distributing the thermal fluid 24 out of the reservoir along the longitudinal direction x within the space 20th by means of a plate 34 configured distribution device. The plate 34 is by means of a hinge 36 pivoted and is used to apply the distribution pressure according to the movement arrow 38 to the base 14th folded.

4th shows schematically a further embodiment, with reference to the in connection with the 1 to 3rd designated and described components is shown schematically, such as a distribution device consisting of individual punches 40 or swords, is used for the thermal transfer fluid 24 gradually squeeze out of the reservoir and along the gap 20th to distribute. To do this, the stamps 40 along the movement arrows 42 gradually along the longitudinal direction x against the base 14th pressed.

5 shows schematically a manufacturing method for manufacturing a battery 10 . A battery housing and a large number of battery modules are used here 12th provided (S1). In one process step S2 will be at least one battery module 12th the multitude of battery modules 12th on a base 14th of the battery case with the formation of at least one between the base area 14th and the at least one battery module 12th extending interspace 20th assembled. In one process step S3 becomes at least one runner 22nd provided in the battery housing and a heat transfer fluid 24 through the at least one runner 22nd in the space 20th initiated. In one step S4 becomes a discharge pressure 26th and / or a viscosity of the heat-conducting fluid 24 adjusted so that the base area 14th during the introduction of the heat-conducting fluid 24 at least in some areas within a predetermined target deformation range 28 with the formation of a bulge 30th is deformed, creating the gap 20th in the area of the bulge 30th to a reservoir for the heat transfer fluid 24 is widened. In one process step S5 becomes one of the inlet pressure 26th counteracting predetermined distribution pressure on the base 14th applied, creating the gap 20th in the area of the bulge 30th constricted and the heat transfer fluid 24 starting from the area of the bulge 30th out of the reservoir along the gap 20th is distributed. The procedural steps S4 and S5 can be carried out at least partially in a temporally overlapping manner.

In order to be able to dissipate the heat generated in the high-voltage batteries during fast charging and when power is called up in electric vehicles, a heat-conducting paste (or a heat-conducting fluid), the so-called gap filler, is used between the battery module and the cooling floor (or base). With the familiar assembly of the high-voltage battery ("old pressing process"), the gap filler is first applied in a caterpillar shape to the still empty battery compartment (or battery housing) and then slowly pushed into the surface by placing and lowering the battery module.

In a preferred embodiment of the method according to the invention, however, the battery module is first placed and screwed into the empty battery compartment. The gap filler is then injected or introduced into the resulting gap (or space). The cooling floor of the battery, which together with the battery modules forms the cavity (or the space) to be wetted with gap filler, is often made of a very soft aluminum material. This cooling base can be elastically deformed at low pressures.

In the later product (i.e. the fully assembled battery), an even gap is important for homogeneous heat dissipation from the battery module. If this even gap is already set during the gap filler injection, e.g. by means of a counterholder, a very high pressure is necessary to convey the gap filler through the gap to the outlet side. If, on the other hand, no counterholder is used, the cooling floor deforms downwards and increases the volume of the cavity.

According to a preferred embodiment of the invention, the high ductility of the soft cooling floor should now be used consciously. The cooling floor is not supported during the injection of the gap filler. It is deliberately allowed that the injected volume (the injected heat-conducting fluid) only spreads over a part of the surface to be wetted, but instead deforms the cooling floor downwards by several millimeters (in the area of the bulge). In the next process step, the gap filler material is then pressed or drummed into the still missing wetting space via a (distribution) device.

The described invention saves an immense amount of time during the injection. Since the bottom (or the base area) gives way, the gap filler material can be introduced with a much higher volume flow than in known methods without exceeding a permissible pressure or total pressure. An acceleration of over 50% is conceivable here, which is reflected directly in the cycle time.

After and / or during the injection, the entire battery moves into the next cycle. A device (the distribution device) is waiting here, which moves from below to the cooling floor. This device is designed in such a way that it does not touch the surface of a battery compartment all at once, but touches it piece by piece. First the area under the sprue is contacted (first contact). The device pushes the cooling floor back to the set target height (the target gap height). Then the contact surface is gradually enlarged in the direction of the vent side (or vent opening), so that the bulged gap is again completely pushed back to the nominal size or deformed back. The gap filler is displaced and flows into the not yet filled area of the wetting surface. After the first contact, the device can either be folded up until it is parallel, or by rolling the material in the right direction. Alternatively, a subdivision into smaller stamps that gradually hit the ground is also conceivable.

Overall, the examples show how the invention can provide a filling optimization of a gap or gap filler gap by means of a distribution device or a flexing tool during gap filler injection or during the introduction of a heat-conducting fluid.

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 102018101543 A1 [0004]
• DE 102013220690 A1 [0005]
• DE 102017116420 A1 [0007]

Claims (10)

A method for producing a battery (10), the battery (10) having a battery housing and a plurality of battery modules (12) arranged in an interior of the battery housing, comprising at least the following steps: a. Providing the battery housing and the plurality of battery modules (12); b. Mounting at least one respective battery module (12) of the plurality of battery modules (12) on a base surface (14) of the battery housing with the formation of at least one intermediate space (20) extending between the base surface (14) and the at least one respective battery module (12); c. Providing at least one runner (22) in the battery housing and introducing a heat-conducting fluid (24) through the at least one runner (22) into the intermediate space (20); characterized by the steps: d. Setting an introduction pressure (26) and / or a viscosity of the heat-conducting fluid (24) in such a way that the base surface (14) during the introduction of the heat-conducting fluid (24) at least partially within a predetermined desired deformation area (28) with the formation of a bulge (30) is deformed, as a result of which the intermediate space (20) is widened in the region of the bulge (30) to form a reservoir for the heat-conducting fluid (24); e. Applying a predetermined distribution pressure counteracting the inlet pressure (26) to the base surface (14), whereby the space (20) narrows in the area of the bulge (30) and the heat-conducting fluid (24) emerges from the area of the bulge (30) from the reservoir is distributed along the gap (20). Procedure according to Claim 1 , wherein the at least one respective battery module (12) has a longitudinal extension axis (x), a transverse extension axis (y) and a depth extension axis (z), the distribution pressure being applied in a directed manner in such a way that the heat-conducting fluid (24) starting from the area of the bulge ( 30), in particular starting from an edge region of the bulge (30), is distributed out of the reservoir along the longitudinal axis (x) of the at least one respective battery module (12) in the space (20). Method according to one of the preceding claims, wherein the heat-conducting fluid (24) is distributed in the direction of at least one vent opening of the interspace (20), a pressure gradient directed towards the vent opening within the interspace (20) supporting the distribution of the heat-conducting fluid (24). Method according to one of the preceding claims, wherein the intermediate space (20) is at least partially delimited and sealed by at least one sealing element (18) arranged between the base surface (14) and the respective battery module (12). Method according to one of the preceding claims, wherein the distribution pressure is applied by means of a roller (32) which, starting from the area of the bulge (30), is rolled along the base surface (14). Method according to one of the Claims 1 to 4th , the distribution pressure being applied by means of a plate (34) which is pivotably mounted by means of a joint (36), the plate (34) being pivoted from the area of the bulge (30) to the base surface (14) or to it is folded. Method according to one of the Claims 1 to 4th wherein the distribution pressure is applied by means of a multiplicity of punches (40), the punches (40) being pressed one after the other and starting from the area of the bulge (30) against the base surface (14). Battery (10), having a battery housing and a plurality of battery modules (12) arranged in an interior of the battery housing, at least one respective battery module (12) on a base surface (14) of the battery housing with the formation of at least one between the base surface (14) and the at least one respective battery module (12) extending intermediate space (20) is arranged, wherein a runner (22) connects the at least one intermediate space (20) with an outer space of the battery (10), wherein in the at least one intermediate space (20) Thermally conductive fluid (24) passed through the sprue channel (22) is contained, characterized in that the base area (14) has a predetermined desired deformation area (28) with at least one material-related and / or structurally related weakness zone, with a mechanical rigidity of the base area ( 14) in the area of the at least one zone of weakness in relation to a mechanical rigidity of the at least one At least one respective battery module (12) is set so that, under the action of a predetermined introduction pressure (26) and / or with a predetermined viscosity of the heat-conducting fluid (24), only a deformation of the base area (14) takes place within the predetermined target deformation range (28) and the deformation provides a bulge (30) as a reservoir for the heat-conducting fluid (24), the base surface (14) being designed to under the action of a predetermined inlet pressure (26) counteracting distribution pressure with at least partial displacement of the heat-conducting fluid (24) out of the reservoir into the intermediate space (20) in the area of the bulge (30). Battery (10) Claim 8 , wherein the base (14) is designed as a temperature control base and has temperature control medium channels through which a temperature control medium can flow, the temperature control base being thermally coupled to the respective battery module (12) by means of the heat conducting fluid (24) contained in the intermediate space (20). Motor vehicle with a battery (10) according to one of the Claims 8 or 9 .

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