CN117957684A

CN117957684A - Battery core

Info

Publication number: CN117957684A
Application number: CN202280062728.XA
Authority: CN
Inventors: M·埃比格豪森; S·L·科赫; M·尤尔塞文
Original assignee: Volkswagen AG
Current assignee: Volkswagen AG
Priority date: 2021-09-17
Filing date: 2022-09-16
Publication date: 2024-04-30
Also published as: DE102021124056A1; WO2023041699A1

Abstract

A battery (1) comprising at least a shape-stable housing (2) and a plurality of layers (3) arranged therein, at least stacked one on top of the other, the layers comprising at least one anode and at least one cathode as electrodes and separators between the different electrodes; wherein the housing (2) comprises an outer surrounding part (4) to form a volume (5) enclosed by the housing (2), and a heat exchanger plate (6) connected to the outer surrounding part (4) within the volume (5), wherein the heat exchanger plate (6) is designed to be at least elastically or plastically deformable in a heat exchanger section (7), wherein the heat exchanger plate (6) comprises at least one connecting element (8) which is integrally connected to the heat exchanger section (7) and forms at least part of the outer surrounding part (4).

Description

Battery core

The invention relates to a battery cell (or cell) comprising at least one dimensionally stable housing and at least one plurality of layers arranged therein, which are stacked at least one on top of the other, the layers comprising at least one anode and at least one cathode as electrodes and separators between the different electrodes. The layers form at least one stack.

At least the stacked, optionally additionally wound or folded cathodes, anodes and separators form a stack. Each electrode is connected to a discharger extending outwardly from the stack so that current can be discharged from or fed into the stack. The discharger of the anode and the discharger of the cathode are connected to each other, respectively, so as to connect the corresponding electrodes in parallel. A plurality of stacks may also be arranged in the battery cells.

Batteries, in particular lithium ion batteries, are increasingly used for driving motor vehicles. A battery is generally composed of a battery cell and/or a battery module including a plurality of battery cells.

From DE 10 2021 112 444.1, a battery cell is known, which comprises at least a housing and at least one active material block arranged therein. The active material block has a plurality of layers at least stacked on each other. The housing comprises a cover part with an open first end side and an open second end side, which completely encloses the at least one active material mass in the circumferential direction, and a core part of one-piece design. The core member has a base member arranged on the first end side and connected to the cover member, and a cover member arranged on the second end side at a spacing therefrom in the axial direction and connected to the cover member, and a center member connecting the base member and the cover member. At least one piece of active material is arranged radially between the cover member and the central member on a first side of the central member and between the cover member and the central member on a second side of the central member opposite the first side. The core component is an extruded profile.

This design of the battery cells makes efficient use of the installation space, meaning that very high values can be achieved for this parameter Wh/l [ watt-hours per liter ].

The connection of the core to the cooling means in the system is also very important. In current designs, there is no direct cooling path between the stack or active material mass and the system cooling device. The heat generated in the housing can be removed simply by the core part proposed in DE 10 2021112 444.1, which is designed as an extruded profile.

The individual battery cells are assembled into a battery module. Since the battery cells "breathe", i.e., expand and contract, in the cycle and generally thicken with aging, it is necessary to compensate for these shape changes and prevent excessive expansion on the fixing frame in the battery module so that the installation space does not collapse. This respiration is particularly pronounced in cells with silicon or lithium metal anodes. Even in conventional cell chemistries with graphite anodes, the swelling (i.e., expansion of the active material or at least one stack) occurs over the lifetime, i.e., the pressure in the cell is always increasing, limiting the design of the battery module. In the case of technical upgrades of battery cells, for example in the context of model upgrades, for example in the optimization of the battery chemistry or in the modification of the structural design, the entire module frame must be redesigned, and if necessary the entire module solution is redeveloped and ensured. This problem also exists with Cell-to-pack systems.

A heat dissipation element for prismatic battery cells is known from the document CN 211828956U.

A battery module element is known from DE 10 2018 215 543 A1. It comprises a frame element in which the battery cells are held together with a cooling element and an interposer element. The interpolation element is of elastic design and can compensate for the thickening of the battery cells.

A battery module having a plurality of battery cells is known from the document US2016/0164149 A1. The battery core is positioned beside the heat dissipation plate.

The object of the present invention is therefore to at least partially solve the problems described in the prior art. In particular, a battery cell is proposed which can be produced at low cost, which can effectively utilize the housing space, which ensures improved temperature control of the battery cell or of the stacks arranged in the housing, and which can compensate for thickness variations of the layers over the service life of the battery cell.

The above problem is solved by a battery cell having the features according to claim 1. Advantageous developments are the subject matter of the dependent claims. The features specified in the claims can be combined with one another in a technically suitable manner and can be supplemented by details from the description and/or the drawings, in which further variants of the invention are specified.

It is proposed that a battery cell comprises at least a dimensionally stable housing and a plurality of layers arranged therein, which are stacked at least one on top of the other, the layers comprising at least one anode and at least one cathode as electrodes and separators between the different electrodes. The housing comprises an outer enclosing member to form a volume enclosed by the housing, and a heat exchanger plate connected to the outer enclosing member within the volume. The heat exchanger plates are designed to be at least elastically or plastically deformable in the heat exchanger sections. The heat exchanger plate comprises at least one connection element which is integrally connected to the heat exchanger section and which forms at least part of the outer surrounding part.

At least the stacked, optionally additionally wound or folded cathodes, anodes and separators form a stack. The electrode has an active material, which is arranged in particular as a coating on an electrically conductive carrier material, which is used in particular as a arrester. The anode, cathode and separator are respectively referred to as layers. The layers may be arranged in any number of individual sheets, stacked, laminated, Z-folded, cylindrical rolls (Jelly Roll), respectively.

Each electrode is connected to a discharger extending outwardly from the stack so that current can be discharged from or fed into the stack. The discharger of the anode and the discharger of the cathode are connected to each other, respectively, so as to connect the corresponding electrodes in parallel. A plurality of stacks may also be arranged in the battery cells.

The electrodes are arranged in particular in a known manner to form a stack and are loaded with electrolyte or electrolyte.

The electrode is designed in particular as a film, with a large side surface and a small thickness. The coating with active material is arranged in particular on one or each side surface of the electrode. The separators are respectively arranged between side surfaces of the adjacently arranged different electrodes. In particular, the uncoated portions of the electrodes protrude from the stack as a discharger.

In particular, the anodes and cathodes are each connected in parallel to one another in the stack, so that the dischargers of the plurality of anodes are electrically connected to one another and the dischargers of the plurality of cathodes are electrically connected to one another.

The housing of the battery cell is in particular only plastically deformable. The case is also called a hard case, and the battery cell is called a prismatic cell, for example.

The battery cell is in particular a lithium-containing battery cell, in particular a secondary battery, i.e. a rechargeable battery cell.

In the case of a ready-to-use battery cell, the housing is in particular of one-piece design. The housing or the surrounding part surrounding the volume is formed by at least one connecting element of the heat exchanger plate and a further component forming the surrounding part, which parts are connected to one another only in the housing production area, but were previously present separately from one another. The one or more connection elements and the heat exchanger plates in particular form a preassembly, which is then connected with further components to form an enclosure.

The heat exchange section is arranged in particular within the volume and adjacent to the at least one stack, in particular on both (largest) sides. The heat exchanger plates are designed to be deformed at least elastically or plastically (if necessary elastically and plastically), in particular only in the heat exchanger sections. The elastic deformability makes it possible in particular to compensate for the increase in thickness of the inner layer during cycling (i.e. during charge and discharge) and during service life. In particular, this makes it possible to compensate for an increase in thickness in the surrounding parts of the housing, so that the dimensions of the housing do not change over the service life.

In particular, the heat exchanger plates are designed to be plastically deformable, in particular only in the heat exchanger sections (also or only). The plastic deformability makes it possible in particular for the thickness of the compensation layer to increase over the service life.

The deformability of the heat exchanger plates serves in particular to compensate for the increased thickness of the layer, so that in particular no deformation of the housing occurs. Plastic deformation of the heat exchanger plates occurs in particular before (plastic) deformation of the shell. This prevents in particular (plastic) deformation of the housing.

The heat exchange section can also perform various functions, for example. In addition to the elastic and/or plastic deformability, it can be designed, in particular, at least in part as a cavity, so that it can be acted upon by a cooling fluid supplied from outside the housing. In particular, the battery cells or at least one stack can be temperature-regulated, i.e. cooled or, if necessary, heated, by means of a heat exchange section.

In particular, the heat exchange section and the at least one connecting element can be integrally formed as a die cast part, an extruded profile or a welded structure. It is also possible here to produce two half shells and to connect them, for example by welding. Of course, manufacturing by additive manufacturing methods (e.g., by three-dimensional printing) may also be used.

In the extrusion process, the raw material is heated to a forming temperature and extruded under high pressure through a forming die. The profile thus produced is further removed from the mould in the feed direction.

In the die casting process, a liquid raw material is introduced into a female die, and after solidification, is demolded.

In particular, at least the heat exchange section is at least partially hollow and has at least one cavity, which is at least partially filled with an elastically deformable material. The wall of the heat exchange section surrounding the cavity can be designed here, for example, as a thin wall or as a deformable material supporting the wall, which can be elastically or plastically deformed.

The heat exchange sections are in particular filled internally with a compressible material, for example with a material known and used in compression pads used in battery modules.

In particular, all volume changes of the battery cells in the housing can be compensated for by the elastic and/or plastic deformability of the heat exchange sections. In this case, it is possible and expedient to adapt the compensation body inside the cell, i.e. the heat exchange section, to the particular cell. Therefore, no additional work in terms of design is required at the module level, and all the battery cells behave the same at the module level even when the chemical composition of the battery cells changes. In particular, no new development is required in model maintenance. Likewise, the modular approach (low cost versus high performance; i.e., low-cost vs. high-performance) with different cells can be applied identically. Thus substantially reducing development costs in diverse combinations.

The heat exchange section is designed in particular as a structural profile component (i.e. with an internal structure, such as a honeycomb or carrier structure), or additionally with springs or even foam in at least one cavity. The heat exchange sections can also be designed in the form of honeycomb structures, wherein the honeycomb is arranged in such a way that the elastic and/or plastic deformability of the heat exchange sections between the individual stacks is ensured.

In particular, the battery cells according to DE102021112444.1 are modified such that the proposed core part is now designed to be elastically and/or plastically deformable. For this purpose, the core part is designed with a greater width, in particular, at least in the region of the central part, so that thickness variations of the layer can be compensated for.

The energy density (volume and weight) at the cell level is also reduced due to the increased space requirements and the increased weight of the heat exchange sections within the volume. But at the module level (i.e. when a plurality of battery cells are considered) this is compensated for by the saving in the battery module, since other compensation elements can be omitted.

In particular, the enclosure part comprises at least one housing part with at least one open first end side, which completely encloses the layer and the heat exchange section in the circumferential direction. The first end side is at least partially closed by at least one connecting element.

The cover part is of in particular cylindrical design, i.e. has only surfaces extending parallel to each other. The first end face extends in particular transversely thereto. The cover part can be designed as a deep-drawn part, wherein both end sides can be designed to be open or one end side can be designed to be closed.

The housing part comprises in particular an open second end face which is at least partially closed by at least one connecting element which is integrally connected to the heat exchange section.

The two end sides are axially opposite. The axial direction extends in particular parallel to the extension of the cylindrical surface of the housing part or transversely to the extension of the first end side.

The at least one connecting element or the plurality of connecting elements each extend parallel to the feed direction and parallel to the at least one end side, for example, when the heat exchanger plate is manufactured by extrusion.

The connecting element has a width in the radial direction, i.e. transversely to the axial direction and transversely to the largest side of the heat exchange section, which is greater than the width of the heat exchange section, in particular by a factor of more than 3, preferably more than 5. The connecting elements extend in particular perpendicularly to the heat exchange section. The heat exchange section has a width of 3 to 15 mm, in particular at most 8 mm, preferably at most 5 mm. The width of the heat exchange section, in particular parallel to the heat exchange section, has a minimum wall thickness (i.e. in particular of solid material) of 0.2 to 5 mm, in particular of at most 3mm, preferably at most 2 mm. The connecting element has in particular a minimum wall thickness, for which wall thickness limits of the heat exchange section are also applicable. The wall thicknesses of the individual components can be designed differently from one another.

The connecting element is designed in particular to have a width which covers exactly the radial extension of the at least one stack.

The at least one connecting element comprises in particular a completely closed surface, so that this end face can also be completely closed. Alternatively, however, the connecting element may have, for example, a connection for the housing or the heat exchanger plate to the cooling device.

In particular aluminum or aluminum alloys or other materials can be used at least as materials for the heat exchange sections and the connecting elements. The materials used here should have, in particular, good thermal conductivity, preferably comparable to or higher than that of aluminum.

In particular, the at least one stack is arranged such that the layers in the region of the side face of the heat exchange section each extend parallel to the side face. If only one stack is provided, the layers may be arranged in a winding around the heat exchange section. If two stacks are provided, each stack may be disposed adjacent to a respective side.

In order to produce the battery cells, a heat exchanger plate is provided in particular first. At least one stack is arranged on the heat exchange section of the heat exchange plate, in particular between the end sides.

At least one stack may be surrounded by an electrically insulating means.

The at least one stack may be arranged on the heat exchange section, in particular, by means of a clamp. The clamping device can enclose the at least one stack from the outside and fix the width of the at least one stack in this way. The width extends transversely to the sides of the heat exchange section. In particular, at least one stack is arranged on the heat exchange section in such a way that it is axially aligned with at least one connecting element.

The heat exchanger plates can be inserted together with at least one stack, in particular together with the insulation means, into the housing part, in particular axially.

At least one connecting element can be connected to the housing part on the respective end face, preferably in a material-fitting manner, for example by welding. The connecting element can be connected to the housing part in particular at least at the contact point with the housing part at the respective end face. In this way, an at least fluid-tight connection, if appropriate even an airtight connection, can be produced between the housing part and the connecting element.

The housing is in particular formed as a cuboid. The side surfaces of the housing, which extend parallel to the sides of the heat exchange sections, have the largest surface in this case and are formed in particular by the cover part. The first and second end sides, on which the at least one connecting element is arranged, may form side surfaces with respectively smaller faces.

In particular, the at least one first connecting element covers at least 10%, preferably at least 20%, of the end face on which the connecting element is arranged.

The longitudinal direction, in particular the feed direction in the extrusion of the heat exchanger plates, extends perpendicularly to the axial direction and parallel to the sides of the heat exchanger sections.

The longitudinal direction extends in particular parallel to the heat exchange section and parallel to the first end side and/or the second end side. The surrounding part is formed on at least one end face by at least two connecting elements that are spaced apart from one another in the longitudinal direction, wherein a space (or referred to as a recess) is formed between the connecting elements.

In particular, two spaces are formed at least on the first end side or the second end side. In particular, the spaces are arranged at a distance from one another in the longitudinal direction, in particular by means of connecting elements.

In particular, at least one electrical contact of the battery cell is arranged in the space.

At least one electrical contact can be arranged in each space, by means of which the stack arranged in the volume can be connected to an electrical circuit arranged outside the housing.

In particular one or more contacts are arranged in each space.

The internal resistance can be reduced by providing a plurality of contacts (i.e., a plurality of contacts on one pole).

The space can be produced from the connecting element or the heat exchanger plate by machining, for example, when the heat exchanger plate is designed as an extruded profile, or can be arranged directly therein, for example, when the heat exchanger plate is designed as a die cast or welded structure. In particular, the heat exchanger plate has no space after extrusion.

In particular, the respective connecting element extends longitudinally beyond the heat exchange section. The stacked layers can thus extend in particular from one side of the heat exchange section to the other side of the heat exchange section, in particular by winding the layers circumferentially around the heat exchange section. The longitudinal extension of the respective connecting element is in particular designed such that it covers exactly the longitudinal extension of the at least one stack.

In particular, at least one end face is closed by only one connecting element. In this case, a connecting element forms the complete end face of the surrounding part, for example.

In particular, the at least one connecting element is connected to the housing part in a material-fitting manner.

The housing of the battery cell is formed in particular by the connection of the heat exchanger plate and the cover part. The housing is in particular of one-piece design when the heat exchanger plate and the housing part are connected by means of a material fit, but is always formed from at least two parts (i.e. from the heat exchanger plate and the housing part).

In particular, the cover part is an extruded profile. The description of the heat exchanger plate applies here also to the extrusion method and the material thickness.

In particular, the surrounding parts on the end face are similar, if necessary even identical, and each have at least one space or two spaces, if necessary even more. Alternatively, the heat exchanger plate has at least two spaces in the region of at least one end face and is closed in the region of the other end face (without spaces, i.e. as a continuous connecting element). But the end sides can equally well have a different amount of space, such as no, one, two or even more.

The at least two electrical contacts of the battery cell may be arranged on one end side or distributed on both end sides.

It is also possible to arrange a plurality of electrical contacts on each end side or only one of the end sides. In this case, similar or different contacts can be arranged on one end face.

The cells with heat exchange plates described herein may have dimensions (two of at least three spatial dimensions, preferably all spatial dimensions) that are particularly comparable to conventional pouch cells with deformable housings or known prismatic cells without heat exchange plates. In particular, the electrical contacts can be arranged on the housing in almost any configuration, so that the proposed battery cell can be easily adapted to the layout of the known battery cell arrangement.

In particular the respective electrical contacts are electrically insulated from the housing. For example, the electrical contacts can have a metallic frame, which can be connected to the housing, for example, in a material-fitting manner. The electrical contacting of the stack is in particular performed by means of an electrical conductor which extends from the stack through the electrical contacts to the environment of the battery cell. The electrical contacts are arranged in particular electrically insulated from the metal frame, for example by contact insulation.

The contacts are arranged in electrical isolation from the at least one stack, in particular by stack isolation. In particular, the at least one contact may also be arranged without insulation from the housing, so that the housing is provided with an electrical potential.

In particular, at least one electrode of at least one stack is electrically conductively connected to a first contact arranged in the space or to a second contact arranged in the other space by means of a discharger which protrudes out of the stack only in the region of the space.

The arrester thus extends from the stack or the insulating means of the stack only at this spatial arrangement or at the arrangement of the electrical contacts or conductors to be contacted by the arrester. The space between the stack and the end or surrounding parts that would otherwise be required for the arrester to remain free therefore only needs to remain free in the contact region. Since there is room in this range, i.e. no connecting element, at least one connecting element can be arranged directly on the stack, i.e. without a holding gap. The respective contact may have the installation space required for the contact between the arrester and the contact, or be arranged such that this installation space is available.

In particular all dischargers of one electrode type (i.e. anode or cathode) are connected to one of the two contacts. All arresters of the other electrode type are preferably connected to the other of the two contacts.

The at least one stack is in particular more than 95%, preferably more than 98%, particularly preferably more than 99% of the minimum height extending axially between the end sides of the connecting element or of the surrounding part. In particular, the stacks have a size which is not large compared to the minimum height, which is at most 1 mm, preferably at most 0.5 mm. In particular at least one stack, is simultaneously contacted at the end side by the surrounding part.

Such small undersize is possible because very high precision can be achieved by extrusion, especially for parts calibrated after extrusion. I.e. in the stacking aspect or in the design of the housing, no clearance needs to be maintained to ensure a fit thereafter when the stack is arranged in the housing, for example in the case of deep drawn housing parts.

The use of the indefinite article "a" or "an" is not to be interpreted as an item, especially in the claims and specification interpreting the claim. Accordingly, the relevant terms and components are understood to mean that they are present at least once, but may also be present in particular a plurality of times.

It is noted that ordinal terms ("first", "second"..) used herein are mainly (solely) used for distinguishing between a plurality of like objects, amounts or processes, i.e., not necessarily for specifying, inter alia, the association and/or order of such objects, amounts or processes with each other. Where association and/or sequence is desired, it is explicitly stated herein or will be obvious to one skilled in the art when studying the specifically described design. The description of a component applies equally to all or most of that component, provided that it can appear multiple times (at least one), but this is not necessarily so. If a plurality of components is referred to herein, it also includes more than two components.

The invention and the technical field are further elucidated below with reference to the accompanying drawings. It is noted that the present invention is not limited by the embodiments. In particular, if not explicitly stated otherwise, some aspects may be extracted from the facts set forth in the figures and combined with other components and knowledge from the present description. It is to be expressly noted that the drawings and the dimensional relationships particularly shown are merely schematic. Wherein:

fig. 1: an exploded perspective view of the battery cell;

Fig. 2: a core component and a heat exchanger plate perspective according to DE 10 2021 112 444.1;

Fig. 3: a perspective view of the heat exchange plate.

Fig. 1 shows an exploded perspective view of a battery cell. Fig. 2 shows a perspective view of the core 21 and the heat exchanger plate 6 according to document DE 10 2021 112 444.1. Fig. 3 shows a perspective view of the heat exchanger plate 6. Fig. 1 to 3 are explained together below.

The battery 1 comprises a dimensionally stable housing 2 and two stacks 28 arranged therein, each with a plurality of layers 3 stacked at least one upon the other, comprising at least one anode and at least one cathode as electrodes and a separator between the different electrodes. The housing 2 comprises an outer enclosing member 4 to form a volume 5 enclosed by the housing 2, and a heat exchanger plate 6 connected to the outer enclosing member 4 within the volume 5. The heat exchanger plates 6 are designed to be elastically and/or plastically deformable in the heat exchanger sections 7. The heat exchanger plate 6 comprises a plurality of connection elements 8 which are integrally connected to the heat exchanger section 7 and form at least part of the outer surrounding part.

The housing 2 is of one-piece design in the ready-to-use battery cell 1. The housing 2 or the surrounding part 4 surrounding the volume 5 is formed by the connecting element 8 and further components (for example contacts 17) forming the surrounding part 4, which are connected to one another only in the production area of the housing 2, but were previously separated from one another. The connection elements 8 and the heat exchanger plates 6 constitute a pre-assembled group, which is then connected with further components to enclose the component 4.

The heat exchange section 7 is arranged within this volume 5 and is adjacent to the respective stack 28 by the two largest sides 20. The heat exchange section 7 is at least partially designed as a cavity 9 and is at least partially filled with an elastically or plastically deformable material 10. The wall of the heat exchange section 7 surrounding the cavity 9 can be embodied as a thin wall or as a deformable wall, so that the elastically or plastically deformable material 10 supports the elastically deformable wall.

The battery cell according to DE102021112444.1 is modified in such a way that its proposed core part 21 is now designed to be elastically and/or plastically deformable. For this purpose, the central part 22 of the core part 21 is now designed as a heat exchange section 7 with a greater width 29, so that thickness variations of the layer 3 can be compensated for.

The enclosure part 4 comprises an enclosure part 11 with an open first end side 12, which completely encloses the layer 3 and the heat exchange section 7 in a circumferential direction 13. The first end side 12 is partially closed by the connecting element 8. The housing part 11 is of cylindrical design, i.e. has only surfaces extending parallel to each other. The first end side 12 extends transversely thereto. The housing part 11 comprises an open second end face 14 which is completely closed by a further connecting element 8, the connecting element 8 being integrally connected to the heat exchange section 7.

The end sides 12, 14 are opposite in the axial direction 18. The axial direction 18 extends parallel to the extension of the cylindrical surface of the housing part 11 or transversely to the extension of the end sides 12, 14.

The connecting elements 8 extend parallel to the feed direction and parallel to the end sides 12, 14, respectively, for example, when the heat exchanger plate 6 is manufactured by extrusion.

In the radial direction 19, i.e. in a direction transverse to the axial direction 18 and transverse to the largest side 20 of the heat exchange section 7, the connecting element 8 has a width 29 which is greater than the heat exchange section 7. The connecting elements 8 extend perpendicularly to the heat exchange section 7.

The width 29 of the connecting element 8 is designed such that it covers exactly the extension of the stack 28 in the radial direction 19.

The connecting elements 8 each have a completely closed surface, so that the second end face 14 is completely closed thereby.

The stacks 28 are arranged such that the layers 3 in the region of the side 20 of the heat exchange section 7 each extend parallel to this side 20.

In order to produce the battery cell 1, in particular, a heat exchanger plate 6 is first provided. The stack 28 is arranged on the heat exchange section 7 of the heat exchange plate 6 between the end sides 12, 14. Each stack 28 is surrounded by an electrical insulation means 23.

The stack 28 is arranged on the heat exchange section 7 by means of a clamp 26. The clamp 26 surrounds the stack 28 from the outside and thereby secures the width 29 of the stack 28 extending in the radial direction 19. The width 29 extends transversely to the sides 20 of the heat exchanger section 7. The stack 28 is arranged on the heat exchange section 7 in such a way that it is arranged in alignment with the connecting element 8 in the axial direction 18.

The heat exchanger plates 6 are inserted together with the stack 28 and the insulation 33 in the housing part 11 in the axial direction 18.

The connecting element 8 is connected to the housing part 11 on the respective end sides 12, 14 by means of a weld seam 27. The housing 2 is configured as a rectangular parallelepiped. The side surface of the housing 2 extending parallel to the side surface 20 of the heat exchange section 7 has the largest surface in this case and is formed by the cover part 11. The first and second end sides 12, 14, on which the connecting element 8 is arranged, form side surfaces with respectively smaller faces.

The longitudinal direction 15, the feed direction in the extrusion of the heat exchanger plates 9, extends perpendicularly to the axial direction 18 and parallel to the side surfaces 20 of the heat exchanger sections 7.

The longitudinal direction 15 extends parallel to the heat exchange section 7 and parallel to the first end side 12 and the second end side 14. The surrounding part 4 is formed on the first end 12 by three connecting elements 8 which are spaced apart from one another in the longitudinal direction 15, wherein a space 16 is formed between the connecting elements 8. Two spaces 16 are formed on the first end side 12. The spaces 16 are arranged at a distance from each other in the longitudinal direction 15 by means of the connecting element 8.

In each space 16, an electrical contact 17 is arranged, by means of which a stack 28 arranged in the volume 5 can be connected to an electrical circuit arranged outside the housing 2.

The other connecting elements 8 extend in the longitudinal direction 15 beyond the heat exchange section 7. The extension of the respective connecting element 8 in the longitudinal direction 15 is designed such that it just covers the extension of the stack 28 in the longitudinal direction 15.

The case 2 of the battery cell 1 is formed by connecting the heat exchange plate 6 and the cover member 11. When the heat exchanger plate 6 and the cover part 11 are connected by a material fit, the housing 2 is of one piece design, but is always formed from several parts, i.e. at least the heat exchanger plate 6 and the cover part 11.

The corresponding electrical contacts 17 are electrically insulated relative to the housing 2. The electrical contacts 17 have a metal frame 30, which can be connected to the housing, for example, in a material-fitting manner. The electrical contact of the stack 28 is made by means of an electrical conductor which extends from the stack 28 to the environment of the battery cell 1 through the electrical contact 17. The electrical contacts 17 are arranged electrically insulated from the metal frame 30 by contact insulation means 24. The contacts 17 are arranged electrically insulated from the stack by stack insulation means 25.

The arrester 31 protrudes from the stack 28 or the insulation 23 of the stack 28 only at the arrangement of the space 16 or at the arrangement of the electrical contacts 17 or electrical conductors to be contacted by the arrester 31. The space between the stack 28 and the first end face 12 or the surrounding part 4, which would otherwise be required for the arrester 31, therefore only has to be kept free in the region of the contacts 17. Since there is a space 16 in this area, i.e. no connecting element 8, the connecting element 8 can be arranged directly on the stack 28, i.e. without a holding gap. The respective contact 17 can have the installation space required for contact between the arrester 31 and the contact 17, or be arranged such that this installation space is available.

List of reference numerals:

1. Battery core

2. Shell body

3. Layer(s)

4. Surrounding part

5. Volume of

6. Heat exchange plate

7. Heat exchange section

8. Connecting element

9. Cavity cavity

10. Material

11. Cover member

12. A first end side

13. Circumferential direction

14. A second end side

15. Longitudinal direction

16. Space of

17. Contact point

18. Axial direction

19. Radial direction

20. Side surface

21. Core component

22. Center part

23. Insulation device

24. Contact insulation device

25. Stacking insulation device

26. Clamp

27. Weld joint

28. Stacking of

29. Width of (L)

30. Frame

31. Discharger

Claims

1. A battery (1) comprising at least a shape-stable housing (2) and a plurality of layers (3) arranged therein, at least stacked one on top of the other, the layers comprising at least one anode and at least one cathode as electrodes and separators between the different electrodes; wherein the housing (2) comprises an outer surrounding part (4) to form a volume (5) enclosed by the housing (2), and a heat exchanger plate (6) connected to the outer surrounding part (4) within the volume (5), wherein the heat exchanger plate (6) is designed to be at least elastically or plastically deformable in a heat exchanger section (7), wherein the heat exchanger plate (6) comprises at least one connecting element (8) which is integrally connected to the heat exchanger section (7) and forms at least part of the outer surrounding part (4).

2. The battery cell (1) according to claim 1, wherein the heat exchange section (7) and the at least one connecting element (8) are integrally formed as a die cast part, an extruded profile or a welded structure.

3. Cell (1) according to one of the preceding claims, wherein at least the heat exchange section (7) is at least partially hollow and has at least one cavity (9) which is at least partially filled with an at least elastically or plastically deformable material (10).

4. Cell (1) according to one of the preceding claims, wherein the surrounding part (4) comprises at least one housing part (11) having at least one open first end side (12), which completely surrounds the layer (3) and the heat exchange section (7) in the circumferential direction (13), wherein the first end side (12) is at least partially closed by at least one connecting element (8).

5. The battery cell (1) according to claim 4, wherein the cover part (11) comprises an open second end side (14), which is at least partially closed by at least one connecting element (8).

6. The battery cell (1) according to claim 4 or 5, wherein the longitudinal direction (15) extends parallel to the heat exchange section (7) and parallel to the second end side (14), wherein the surrounding part (4) is formed on at least one end side (12, 14) by at least two connecting elements (8) which are spaced apart from each other in the longitudinal direction (15), wherein a space (16) is formed between the connecting elements (8).

7. Battery cell (1) according to one of the preceding claims 4 to 6, wherein at least two spaces (16) are formed on the first end side (12) or the second end side (14).

8. The battery cell (1) according to claim 6 or 7, at least one electrical contact (17) of the battery cell (1) being located in the space (16).

9. The battery cell (1) according to one of the preceding claims 4 to 8, wherein at least one end side (12, 14) is closed only by the connecting element (8).

10. Battery cell (1) according to one of the preceding claims, wherein at least one connecting element (8) is connected to the housing part (11) in a material-fitting manner.