CN116724447A - Battery cell - Google Patents

Abstract

A battery cell (1) comprising at least a housing (2) and at least one active material block (3, 4) arranged in the housing, wherein the active material block (3, 4) has a plurality of layers (5) comprising at least one anode, at least one cathode and separators between the different electrodes; wherein the housing (2) comprises a cover part (6) having an open first end face (7) and an open second end face (8) and surrounding the at least one active material block (3, 4) circumferentially (9), and a core part (10) of one-piece design, wherein the core part (10) has a base part (11) and a cover part (13) and an intermediate part (14) connecting the base part (11) to the cover part (13), which is arranged on the first end face (7) and is connected to the cover part (6), and wherein the cover part is arranged on the second end face (8) at a distance from the base part in the axial direction (12) and is connected to the cover part (6).

Description

Battery cell

The invention relates to a battery cell comprising at least a housing and at least one active material block arranged in the housing, wherein the active material block has a plurality of layers comprising at least one anode, at least one cathode and separators between the different electrodes.

Each active material block has, inter alia, a plurality of anodes and cathodes and separators between the different electrodes. The stacked cathode, anode and electrode constitute a flat, but large-faced block of active material. Each electrode is connected to a discharger extending outwardly from the active material mass so that current can be conducted from or to the active material mass. The discharger of the anode and the discharger of the cathode are respectively connected to each other so as to electrically connect the corresponding electrodes in parallel.

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

The active material blocks are arranged in the case individually or in groups and thus constitute battery cells. In particular, the most efficient use of the installation space is to be achieved here. Here, wh/l [ watt-hours per liter ] is an important characteristic value of the battery cell. In the current embodiment of prismatic cells, a certain defined proportion of the housing volume can be used for the cell windings/cell stacks.

Furthermore, the connection of the battery cells to the cooling means in the system is very important. In the present embodiment, no direct cooling path exists between the cell stack/cell winding or active material block and the system cooling device. Since the current design uses deep drawing components as the housing, flexible specifications are only limited. There is a correlation in particular between the deep drawing height and the cell width.

In the present embodiment of the battery cell, the cell stack/cell winding or the active material block is arranged in a deep-drawn housing part. The deep drawn housing part is connected to a cover assembly, which generally has a current collector for contacting a arrester of one electrode type, a receiving grid for receiving the current collector and electrically insulating it relative to the housing part, a terminal for providing electrical contact of the current collector with the environment of the battery cell, and an insulating part for insulating the terminal relative to the housing.

The current construction of deep drawn housing parts and cover assemblies, which are used for prismatic cells, results in the following limitations: the maximum installation space utilization of the housing is about 80% due to the contact of the cover assembly with the arrester of the unitary winding body; the gauge and size is limited by the deep drawing of the housing piece (correlation between cell thickness and cell depth); the battery cell is in poor thermal contact with the cooling system; assembly cost (deep drawn housing piece and cover assembly).

A battery assembly with an extruded container is known from DE 10 2017 103 237 A1.

A method for producing a battery cell is known from document EP 3 133 667 A1.

A prismatic battery is known from DE 698 25 810t 2.

The object of the present invention is to at least partially solve the problems mentioned in connection with the prior art. In particular, a battery cell is proposed which can be produced inexpensively and which enables efficient space utilization of the housing.

The technical problem is solved by a battery cell having the technical features according to claim 1. Advantageous developments are the subject of the dependent claims. The features mentioned individually in the description can be combined with one another in a technically meaningful way and can be supplemented by the facts explained in the description and/or the details in the drawings, wherein further embodiment variants of the invention are shown.

A battery cell is proposed, which comprises at least a housing and at least one active material block arranged in the housing. The active material block has a plurality of layers including at least one anode, at least one cathode, and a separator between the different electrodes. The housing comprises

A cover member having an open first end side and an open second end side and circumferentially surrounding the at least one active material block entirely in a circumferential direction, and

-a core of unitary 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 an axial distance from the base member and connected to the cover member, and an intermediate member connecting the base member to the cover member. The at least one active material block is arranged radially between the housing part and the intermediate part on a first side of the intermediate part and between the housing part and the intermediate part on a second side of the intermediate part opposite to the first side. The core is an extruded profile.

The active material mass comprises, in a known manner, in particular at least one anode and at least one cathode as electrodes. A separator is disposed between the anode and the cathode, respectively. The active material is arranged in particular as a coating on an electrically conductive base material, which serves in particular as a discharger. The anode, cathode and separator are respectively referred to as layers.

The electrodes are arranged in particular in a known manner to constitute an active material mass and to which an electrolyte or electrolyte solution is applied.

The active material block has, in particular, a plurality of electrodes and separators which are arranged one above the other or stacked and then arranged in a common winding. The layers may be arranged in any number of individual stacks, layers, Z-folds, cores (Jelly Roll), respectively.

The electrode is designed in particular as a film, i.e. with a large side and a small thickness. A coating with active material is arranged in particular on the or each side of the electrode. The separators are disposed between the sides of the different electrodes disposed adjacently, respectively. The uncoated portion of the electrode extends from the active material mass, in particular as a discharger.

The anodes and cathodes are connected in parallel to one another, in particular in the active material mass, in each case, so that the dischargers of the plurality of anodes are connected to one another in an electrically conductive manner and the dischargers of the plurality of cathodes are connected to one another in an electrically conductive manner.

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

The battery cells are in particular lithium-containing battery cells, in particular secondary, i.e. rechargeable, battery cells. The battery cells are arranged in particular in an insulating cell housing. The single-piece housing in particular forms a single-piece insulator. The battery cell described below includes, among other things, the cell insulator.

The housing is designed in particular as one piece in the battery cell that is ready for use. The housing is composed of a cover part and a core part, which are connected to each other only during the production of the housing, but which were previously present as a single piece.

The outer jacket part is in particular designed cylindrically, i.e. has only faces extending parallel to the axial direction.

The core is an extruded profile and is manufactured by a known extrusion process.

During extrusion, the starting material is heated to a deformation temperature and extruded through a forming die using high pressure. The profile thus produced is further removed from the mould in the feed direction.

The cover, the bottom part and the intermediate part or both sides respectively extend parallel to the feed direction. The cover and the base part have a width in the radial direction, i.e. transversely to the feed direction and the axial direction, which is greater than the width of the intermediate part, in particular a width of 5 times, preferably 10 times. The cover and the base part extend in particular perpendicularly to the intermediate part. The intermediate piece has a minimum wall thickness, in particular parallel to the width of the intermediate piece, of 0.2 to 5 mm, in particular at most 3 mm, preferably at most 2 mm. The cover and the base part have in particular a minimum wall thickness for which the limitation of the wall thickness of the intermediate part applies equally. The wall thicknesses of the individual components can be designed differently from one another.

The width of the cover and the base part is designed in particular such that it exactly covers the extent of the at least one active material mass in the radial direction.

Aluminum or aluminum alloys may be used as the material, in particular, or other materials may be used as the material. The materials used should have a good thermal conductivity, which is preferably comparable to or higher than that of aluminum.

The at least one active material block is in particular arranged such that the layers extend parallel to both sides of the intermediate piece in the region of both sides. If only one active material block is provided, these layers may be arranged in a winding around the intermediate piece. If two active material blocks are provided, each active material block may be disposed adjacent to a respective side.

In order to produce the battery cells, a core part is provided in particular first. At least one block of active material is disposed on the core member, between the cover member and the base member. Here, the at least one active material block may be surrounded by an electrical insulation.

The at least one active material block may in particular be arranged on the intermediate piece by means of a clip. The clip may externally surround at least one active material block and thus fix the width of the at least one active material block. The width extends transversely to both sides of the intermediate piece. The at least one active material block is arranged in particular on the core element in such a way that it is arranged in alignment in the axial direction with respect to the base element and, if appropriate, with respect to the cover element.

The core element can be inserted into the housing element together with at least one active material block, in particular together with the one-piece insulating element, in particular in the axial direction.

The base part can be connected to the cover part on the first end face, preferably by a material-bonding, for example by welding. The base part can be connected to the housing part, in particular, on the first end face, at least at the contact point with the housing part. In this way, an at least liquid-tight, if appropriate also gas-tight connection can be established between the cover part and the base part.

The cover part can be connected to the housing part on the second end face, preferably by a material-bonding, for example by welding, at least at the contact point with the housing part. In this way, an at least fluid-tight, if appropriate also gas-tight connection can be established between the cover part and the cover part at least along the material-bonded connection.

The housing is in particular designed as a cuboid. In this case, the side of the housing that extends parallel to both sides of the intermediate piece has the largest surface and is formed in particular by the cover piece. The first and second end sides on which the cover and the base are arranged may form sides with minimal faces (preferably but not necessarily realized in the second embodiment variant described later). Alternatively, the first and second end sides may be arranged adjacent to the minimum and maximum faces, respectively (preferably but not necessarily realized in the first embodiment variant described later).

The base part in particular completely closes the first end face.

The longitudinal direction, in particular the feed direction during extrusion of the core element, extends in particular perpendicularly to the axial direction and parallel to both sides of the intermediate element. The cover has a plurality of cover segments arranged at intervals from one another in the longitudinal direction, respectively, via which the cover is connected to the housing part on the second end side. The cover has, in particular, at least one first recess and at least one second recess (first variant of embodiment).

The longitudinal direction, in particular the feed direction during extrusion of the core element, extends in particular perpendicularly to the axial direction and parallel to both sides of the intermediate element. The base part has a first recess and at least one cover section in the longitudinal direction and the cover part has a second recess and at least one cover section in the longitudinal direction, wherein the base part and the cover part are each connected to the outer cover part on each end side by means of the at least one cover section (second variant of embodiment).

According to a first embodiment variant of the battery cell, at least two recesses are arranged on one end side (second end side). According to a second variant of embodiment, at least two recesses are arranged on opposite end sides.

The base part or cover has in particular a plurality of cover segments arranged at intervals from one another in the longitudinal direction by respective recesses.

At least the bottom part or at least the cover part or both parts have two recesses, respectively. An electrical first or second connector may be disposed in each of the two voids of the component. In particular, two first joints, two second joints or one first joint and one second joint are arranged in the two recesses of a component.

The internal resistance may be reduced by providing a plurality of joints (i.e., a plurality of first joints and/or a plurality of second joints).

In particular, the cover and the base are designed similarly, if necessary even identically, and each have at least one recess or two recesses, if necessary even more recesses. Alternatively, the cover has at least two voids, while the base is designed to be closed (without voids). However, the cover and the base part may also have a different number of voids, i.e. zero, one, two or even more voids.

The cover part is connected to the housing part, in particular via the cover section or the at least one cover section.

The similarly configured base part is connected to the cover part, in particular by at least one cover section.

The recess can be machined from the cover, in particular by machining. The cover or the base part has no play, in particular after extrusion.

The cover and/or the base part extend in particular longitudinally beyond the intermediate part. Thus, the layers of the active material mass may in particular extend from one side of the intermediate piece to the other side of the intermediate piece, in particular by winding the layers circumferentially around the intermediate piece. The cover and the base part are designed in particular to have a longitudinal extent which exactly covers the longitudinal extent of the at least one active material block.

The case of the battery cell is made by connecting the core member with the outer cover member. In the case of a material-bonded connection of the core part to the cover part, the housing is in particular of one piece design, but is always made of at least two parts, namely core part and cover part.

At least one electrical first terminal of the battery cell is arranged in particular in the first recess.

At least one electrical second connection of the battery cell is arranged in particular in the second recess.

The at least one electrical second connection of the battery cell is arranged in particular in a second recess which is arranged separately from the first recess by at least one cover section (first variant embodiment).

The at least two electrical connections can then be arranged on one end side (first variant embodiment) or distributed on both end sides (second variant embodiment).

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

The battery cells described herein with the core may in particular have dimensions (at least in two of the three spatial dimensions, preferably in all spatial dimensions) comparable to usual pouch battery cells with deformable housings and without a core. The electrical connector can be arranged in almost any configuration on the housing, in particular, so that the proposed battery cell can be adapted in a simple manner to the arrangement provided for the known battery cell.

The electrical connector is used to electrically contact the electrode of the active material block with an electrical circuit disposed outside of the battery cell. The active material mass may be charged and/or discharged through the electrical connector(s).

The individual contacts are in particular electrically insulated relative to the housing. For example, the electrical connector may have a metal frame that is capable of being joined to the housing, such as by a material bond. The electrical contact of the active material block is achieved in particular by means of electrical contacts which extend from the active material block through the electrical connector to the surroundings of the battery cell. The electrical contact is arranged to be electrically insulated, for example by a contact insulator, in particular with respect to the metal frame.

The joint is arranged to be electrically insulated by a joint insulation, in particular with respect to the at least one active material block. The at least one connection can in particular also be arranged uninsulated with respect to the housing, so that the housing has an electrical potential.

The at least one electrode of the at least one active material block is electrically conductively connected to the first connection or to the second connection arranged in the second recess, in particular via a discharger extending from the active material block only in the region of the recess.

The arrester then extends out of the active material block or the individual insulation, in particular only at the interspace or at the arrangement of the electrical contacts to be contacted by the arrester. The space between the active material block and the cover or base part, which is normally required for the arrester, therefore only has to be reserved in the region of the contacts. Since there is a gap in this region, i.e. there is just no cover or base part, the cover or base part can be arranged directly, i.e. without the need to provide a gap, on the active material block. Each connector may have a mounting space required for contact between the arrester(s) and the contacts, or may be arranged so that there is such a mounting space.

In particular, all dischargers of one electrode type, namely the anode or the cathode, are connected to one of the two connections. Preferably, all arresters of the other electrode type are connected to the other of the two connectors.

In particular, at least the base part or at least the cover part, preferably both parts, are connected in a material-bonded manner to the cover part.

The cover member is preferably (also) an extruded profile. For the cover part, the feed direction during extrusion extends in particular in the axial direction. The description of the extrusion or the core element with respect to wall thickness and/or thermal conductivity is equally applicable here, for example.

The housing is in particular designed as a cuboid. In this case, the side of the housing that extends parallel to both sides of the intermediate piece has the largest surface and is formed in particular by the cover piece. The side surfaces arranged on the first and second end sides are at least partially formed by the cover part and the bottom part. The other two sides are also formed in particular by the cover part. That is, the two sides formed by the cover part either form a minimum surface of the housing having a cuboid shape (preferably but not necessarily in the first described embodiment variant) or form sides arranged adjacent to the minimum surface and the maximum surface, respectively (preferably but not necessarily in the second described embodiment variant).

The battery cell has, in particular, exactly one active material block, wherein the layers of the active material block are arranged in a wound fashion around the core element in the circumferential direction.

According to a further embodiment, the battery cell has exactly two active material blocks, wherein a first active material block is arranged between the first side and the housing part and a second active material block is arranged between the second side and the housing part.

The active material mass is in particular arranged to be electrically insulated with respect to the core element and/or with respect to the cover element, for example by means of a single insulating element. In describing the size of the active material block, the unit insulator is calculated as the active material block.

The at least one active material piece extends in particular over a proportion of more than 95%, preferably more than 98%, particularly preferably more than 99% of the minimum height extending in the axial direction between the base part and the cover part. The active material mass has in particular a size shortage of at most 1 mm, preferably at most 0.5 mm, compared to this minimum height. At least one active material block is in particular in contact with both the base part and the cover part.

Such small undersize is possible because, especially for components calibrated after extrusion, a very high precision can be obtained by extrusion. I.e. there is no need in the case of active material blocks or in the case of a housing design to provide play as is the case, for example, in deep drawn housing components to ensure a subsequent fit when the active material blocks are arranged in the housing.

Another advantage of the proposed housing design is that good heat dissipation from the active material mass to the surroundings of the battery cell can be ensured by the extruded core. The embodiment of the core with the intermediate piece is particularly advantageous here, since the intermediate piece extends through the one active material piece or between the two active material pieces.

The use of the indefinite articles "a" and "an" in the claims and the specification to present the claims should be understood as a matter of course and should not be interpreted as a number of words. Accordingly, the terms or components correspondingly introduced thereby should be understood as meaning that these terms or components occur at least once and in particular also multiple times.

It should be noted that the words ("first", "second", etc.) as used herein are primarily (solely) used to distinguish one from another plurality of identical objects, sizes or procedures, i.e., in particular, not to impose regulations on the relatedness and/or order of such objects, sizes or procedures to one another. If correlation and/or order is desired, this will be explicitly stated herein or will be apparent to those skilled in the art upon studying the specifically described designs. If a component can occur multiple times ("at least one"), the description of one of the components can apply equally to all or most of the components, but this is not mandatory.

The invention and the technical environment are explained in more detail below with reference to the figures. It should be noted that the present invention should not be limited by the illustrated embodiments. In particular, if not explicitly stated otherwise, parts of the facts depicted in the figures may also be extracted and combined with other components and knowledge in the description. It should be noted in particular that the figures and the dimensional proportions shown in particular are merely schematic. In the drawings:

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

fig. 2: an exploded perspective view of a battery cell (first embodiment variant);

fig. 3: a perspective view of the core member and two active material blocks of the battery cell according to fig. 2 before assembly;

fig. 4: a perspective view of the core and the active material block according to fig. 3 in an assembled state;

fig. 5: the core and the active material block according to fig. 4, in perspective, before assembly of the two electrical connectors;

fig. 6: a perspective view of the core and the active material block according to fig. 5, and two electrical connectors during assembly;

fig. 7: the core and the active material block and the cover according to fig. 6 are seen in perspective before assembly into a housing;

fig. 8: a perspective view of the housing according to fig. 7;

fig. 9: a perspective view of the core and the active material block according to fig. 2;

fig. 10: a perspective view of the core and the active material block according to fig. 4;

fig. 11: a perspective view of the battery cell according to fig. 1 with section lines XII-XII and XIII-XIII;

fig. 12: cut surfaces XII-XII according to FIG. 11;

fig. 13: section XIII-XIII according to FIG. 11;

fig. 14: the battery cell according to fig. 2 has a perspective view with cut lines XV-XV and XVI-XVI;

fig. 15: cut surface XV-XV according to FIG. 14;

fig. 16: cut surfaces XVI-XVI according to FIG. 14; and

fig. 17: an exploded perspective view of a further battery cell (second variant embodiment).

Fig. 1 shows an exploded perspective view of a known battery cell 1. In the present embodiment of the battery cell 1, the two active material blocks 3, 4 are arranged in a deep-drawn housing part 6 (comprising the bottom part). The deep drawn cover part 6 is connected to a cover assembly 28, which generally comprises a cover part 13, two current collectors 29 for contacting the arrester 24 of the electrode, an insulating receiving grid 30 for receiving and electrically insulating the current collectors 29 relative to the cover part 13, two terminals 22, 23 for electrically contacting the current collectors 29 with the surroundings of the battery cell 1, and a terminal insulator 26 for insulating each terminal 22, 23 relative to the cover part 13.

Fig. 2 shows an exploded perspective view of the battery cell 1. The battery cell 1 includes a case 2 and first and second active material blocks 3 and 4 disposed in the case. The active material blocks 3, 4 each have a plurality of layers 5 including at least one anode, at least one cathode, and separators between the different electrodes. The housing 2 comprises a cover part 6, which has an open first end side 7 and an open second end side 8 and which surrounds the active material pieces 3, 4 in the circumferential direction 9 over the entire circumference, and a core part 10 of one-piece design. The core element 10 has a base part 11 arranged on the first end side 7 and connected to the cover element 6, and a cover element 13 arranged on the second end side 8 at a distance from the base part in the axial direction 12 and connected to the cover element 6, and an intermediate element 14 connecting the base part 11 to the cover element 13. On a first side 15 of the intermediate piece 14, the first active material mass 3 is arranged between the housing piece 6 and the intermediate piece 14 in a radial direction 16, and on a second side 17 of the intermediate piece 14 opposite to the first side 15, the second active material mass 4 is arranged between the housing piece 6 and the intermediate piece 14. The core 10 is an extruded profile.

The housing 2 is designed in one piece in the battery cell 1 ready for use (see fig. 15). The housing 2 is composed of a cover part 6 and a core part 10, which are connected to each other only when the housing 2 is manufactured, but which were previously present as a single piece.

The housing part 6 is designed cylindrically, i.e. with only a face extending parallel to the axial direction 12.

The housing 2 is rectangular in design. The side of the housing 2 extending parallel to the two sides 15, 17 of the intermediate piece 14 has the greatest area and is formed by the cover piece 6. The first end side 7 and the second end side 8 form side surfaces which are arranged adjacent to the minimum surface and the maximum surface, respectively. The other two sides with the smallest area are likewise formed by the cover element 6.

The cover 13, the base 11 and the intermediate part 14 or the two side faces 15, 17 each extend parallel to the longitudinal direction 18. The cover 13 and the base 11 have a greater width than the intermediate piece 14 in the radial direction 16, i.e. in a direction transverse to the longitudinal direction 18 and the axial direction 12. The cover 13 and the base 11 extend perpendicular to the intermediate piece 14. The width of the cover 13 and the base 11 is designed such that it exactly covers the extent of the active material pieces 3, 4 in the radial direction 16.

The active material blocks 3, 4 are arranged such that the layers 5 extend parallel to the two sides 15, 17 of the intermediate piece 14 in the region of these two sides 15, 17, respectively. The two active material blocks 3, 4 are arranged adjacent to the respective side faces 15, 17.

The cover 13 has cover sections 21 arranged at a distance from each other in the longitudinal direction 18 by means of recesses 19, 20, respectively, via which the cover 13 is connected to the housing part 6 on the second end side 8.

The cover 13 is connected to the housing part 6 via these cover sections 21.

The cover 13 extends beyond the intermediate piece 14 in the longitudinal direction 18. The extent of the cover 13 and the base 11 in the longitudinal direction 18 is designed such that it exactly covers the extent of the active material blocks 3, 4 in the longitudinal direction 18.

The case 2 of the battery cell 1 is manufactured by connecting the core member 10 and the outer cover member 6. In the case of a material-bonded connection of the core element 10 and the cover element 6, the housing 2 is designed in one piece, but is always made of at least two pieces, namely the core element 10 and the cover element 6.

An electrical first terminal 22 of the battery cell 1 is arranged in the first recess 19. The electrical second connection 23 of the battery cell 1 is arranged in a second recess 20, which is arranged separately from the first recess 19 by a cover section 21. The electrical connectors 22, 23 are used to electrically contact the electrodes of the active material blocks 3, 4 with an electrical circuit disposed outside the battery cell 1. Each joint 22, 23 is electrically insulated with respect to the housing 2. The electrical connections 22, 23 can have a metal frame which can be connected to the housing 2, for example in a material-bonded manner. The electrical contact of the active material blocks 3, 4 is made by electrical contacts that extend from the active material blocks 3, 4 through the electrical connectors 22, 23 to the surroundings of the battery cell 1. The electrical contacts are arranged to be electrically insulated with respect to the metal frame, for example by contact insulators 27. Each tab 22, 23 is arranged to be electrically insulated with respect to the active material mass 3, 4 by a tab insulator 26.

Each electrode of the active material mass 3, 4 is electrically conductively connected to the first connection 22 or to the second connection 23 via a discharger 24 which extends out of the active material mass 3, 4 only in the region of the interspace 19, 20.

The arrester 24 extends from the active material block 3, 4 or the individual insulator 25 only at the interspaces 19, 20 or at the arrangement of the electrical contacts to be contacted by the arrester 24.

The active material blocks 3, 4 are arranged on the intermediate member 14 by a clip 31. The clip 31 may externally surround the active material pieces 3, 4 and thus fix the width of the active material pieces 3, 4. Which extends transversely to both sides 15, 17 of the intermediate piece 14. The active material blocks 3, 4 are arranged on the core 10 in such a way that they are arranged in alignment in the axial direction 12 with respect to the base part 11 and the cover part 13 or the cover section 21.

Fig. 3 shows a perspective view of the core 10 and the two active material blocks 3, 4 of the battery cell 1 according to fig. 2 before assembly.

Fig. 4 shows a perspective view of the core 10 and the active material blocks 3, 4 according to fig. 3 in the assembled state.

To manufacture the battery cell 1, the core member 10 is first provided. The active material blocks 3, 4 are arranged on the core 10, between the cover 13 and the base 11. The active material blocks 3, 4 can be surrounded by an electrical single insulator 25.

Fig. 5 shows a perspective view of the core 10 and the active material blocks 3, 4 and the two electrical connectors 22, 23 according to fig. 4 before assembly.

Fig. 6 shows a perspective view of the core 10 and the active material blocks 3, 4 and the two electrical connectors 22, 23 according to fig. 5 during assembly. In the second connection 23, the arrester 24 is shown in contact connection with the second connection 23. The joints 22, 23 are connected to the cover 13 and the housing part 6 by means of welds 32.

Fig. 7 shows a perspective view of the core 10 and the active material pieces 3, 4 and the cover 6 according to fig. 6 before assembly into the housing 2.

Fig. 8 shows a perspective view of the housing 2 according to fig. 7.

The core member 10 may be inserted into the outer cover member 6 in the axial direction 12 together with the active material blocks 3, 4 and the single insulating member 25.

The base part 11 can be connected to the cover part 6 on the first end side 7 by a weld 32. On the second end side 8, the cover part 13 can be connected to the housing part 6 by means of a weld 32 at the contact point with the housing part 6. The bottom part 11 completely closes the first end side 7.

The cover element 6 is also designed as an extruded profile. In the case of the housing part 6, the feed direction during extrusion extends in the axial direction 12.

Fig. 9 shows a perspective view of the core 10 and the active material mass 3 according to fig. 2. The layers 5 of the active material mass 3 are arranged to be wound around the core 10 in the circumferential direction 9.

Fig. 10 shows a perspective view of the core 10 and the active material blocks 3, 4 according to fig. 4. The battery cell 1 has exactly two active material blocks 3, 4, wherein the first active material block 3 is arranged between the first side 15 and the housing part 6 and the second active material block 4 is arranged between the second side 17 and the housing part 6.

Fig. 11 shows a perspective view of the battery cell 1 according to fig. 1 with the section lines XII-XII and XIII-XIII. Fig. 12 shows a section view XII-XII according to fig. 11. Fig. 13 shows a section view XIII-XIII according to fig. 11. Fig. 11 to 13 are described together below. Reference is made to the description for fig. 1.

The sections XII-XII extend transversely to the longitudinal direction 18 outside the tabs 22, 23 to cut the battery cell 1. The sections XIII-XIII extend transversely to the longitudinal direction 18 to cut the battery cells 1 and to cut the tabs 23.

A large free space between the active material pieces 3, 4 and the upper end of the cover 13 or deep drawn housing piece 6 can be seen. This large free space results on the one hand from the large tolerances of the deep drawing and on the other hand from the connection of the arrester 24 to the current collector 29 arranged in the cover 13.

Fig. 14 shows a perspective view of the battery cell 1 according to fig. 2 with the section lines XV-XV and XVI-XVI. Fig. 15 shows a cross-section view XV-XV according to fig. 14. Fig. 16 shows a section view XVI-XVI according to fig. 14. Fig. 14 to 16 are described in combination below. Reference is made to the description with respect to fig. 2 to 8.

The sections XV-XV extend transversely to the longitudinal direction 18 outside the tabs 22, 23 to cut the battery cell 1. The sections XVI-XVI extend transversely to the longitudinal direction 18 to cut through the battery cell 1 and to cut through the joint 23.

The active material pieces 3, 4 extend over a proportion of more than 99% of the minimum height 33 extending in the axial direction 12 between the base part 11 and the cover part 13. The active material blocks 3, 4 can optionally be brought into contact with both the base part 11 and the cover part 13. The arrester 24 is arranged only in the region of the gaps 19, 20 and is in contact with the contact elements of the respective contacts 22, 23.

The intermediate piece 14 can be used for efficient cooling of the active material pieces 3, 4.

Fig. 2 to 11 and 14 each show a battery cell 1 according to a first embodiment variant. The electrical connections 22, 23 are arranged on the cover 13.

Fig. 17 shows an exploded perspective view of another battery cell 1 (second embodiment variant). Here, a first joint 22 is arranged in the first interspace 19 of the bottom part 11 and a second joint 23 is arranged in the second interspace 20 of the cover part 13.

The longitudinal direction 18 extends perpendicularly to the axial direction 12 and parallel to both sides 15, 17 of the intermediate piece 14. The base part 11 has a first recess 19 and two cover sections 21 spaced apart from one another in the longitudinal direction 18, and the cover part 13 has a second recess 20 and two cover sections 21 spaced apart from one another in the longitudinal direction 18. The base part 11 and the cover part 13 are each connected to the outer cover part 6 at the respective end sides 7, 8 by a cover section 21.

The cover 13 and the base 11 of the core 10 are identically designed and have a recess 19, 20, respectively. The cut-away surfaces of the cover 13 shown in fig. 12 and 13 and fig. 15 and 16 are designed similarly to the base part 11 or the cover 13 with only one electrical connection 22, 23, respectively.

The housing 2 is rectangular in design. The side of the housing 2 that extends parallel to the two sides 15, 17 of the intermediate piece 14 has the largest surface and is formed by the cover piece 6. The first end side 7 and the second end side 8 on which the cover 13 and the base 11 are arranged form sides with a minimum surface. The other two sides, which are arranged adjacent to the smallest and largest faces, respectively, are likewise formed by the cover element 6.

List of reference numerals

1 Battery cell

2 shell body

3 first active material block

4 second active material block

5 layers

6 outer cover piece

7 first end side

8 second end side

9 circumferential direction

10 core piece

11 bottom part

12 axial direction

13 cover

14 intermediate piece

15 first side

16 radial direction

17 second side

18 longitudinal direction

19 first gap

20 second gap

21 cover section

22 first joint

23 second joint

24 discharger

25 single insulating piece

26-joint insulator

27 contact insulator

28 cover assembly

29 current collector

30 accommodate the grid

31 clip

32 weld joint

33 height of

Claims (13)

1. A battery cell (1) comprising at least a housing (2) and at least one active material block (3, 4) arranged in the housing, wherein the active material block (3, 4) has a plurality of layers (5) comprising at least one anode, at least one cathode and separators between the different electrodes; wherein the housing (2) comprises a cover part (6) having an open first end side (7) and an open second end side (8) and surrounding the at least one active material block (3, 4) circumferentially (9), and a core part (10) of one-piece design, wherein the core part (10) has a base part (11) and a cover part (13) and an intermediate part (14) connecting the base part (11) to the cover part (13), which is arranged on the first end side (7) and is connected to the cover part (6), and wherein the cover part is arranged on the second end side (8) at a distance from the base part in the axial direction (12) and is connected to the cover part (6); wherein the at least one active material block (3, 4) is arranged between the outer shell (6) and the intermediate piece (14) on a first side (15) of the intermediate piece (14) in a radial direction (16) and between the outer shell (6) and the intermediate piece (14) on a second side (17) of the intermediate piece (14) opposite to the first side (15); wherein the core (10) is an extruded profile.

2. The battery cell (1) according to claim 1, wherein the bottom part (11) completely closes the first end side (7).

3. The battery cell (1) according to any of the preceding claims, wherein a longitudinal direction (18) extends perpendicular to the axial direction (12) and parallel to both sides (15, 17) of the intermediate piece (14); wherein the cover (13) has a plurality of cover segments (21) arranged at intervals from one another in the longitudinal direction (18) by means of recesses (19, 20), respectively, by means of which the cover (13) is connected to the outer cover (6) on the second end face (8); wherein the cover (13) has at least one first recess (19) and at least one second recess (20).

4. The battery cell (1) according to claim 1, wherein a longitudinal direction (18) extends perpendicular to the axial direction (12) and parallel to both sides (15, 17) of the intermediate piece (14); wherein the base part (11) has a first recess (19) and at least one cover section (21) in the longitudinal direction (18), and the cover part (13) has a second recess (20) and at least one cover section (21) in the longitudinal direction (18), wherein the base part (11) and the cover part (13) are connected to the housing part (6) on each end side (7, 8) by means of the at least one cover section (21).

5. The battery cell (1) according to claim 4, wherein the base part (11) or the cover part (13) has a plurality of cover segments (21) arranged at a distance from one another in the longitudinal direction (18) by respective interspaces (19, 20).

6. The battery cell (1) according to any of the preceding claims 3 to 5, wherein at least the bottom part (11) or at least the cover part (13) has two voids (19, 20), respectively.

7. The battery cell (1) according to any of the preceding claims 3 to 6, wherein at least one electrical first connector (22) of the battery cell (1) is arranged in the first void (19).

8. The battery cell (1) according to any of the preceding claims 3 to 7, wherein at least one electrical second connector (23) of the battery cell (1) is arranged in the second void (20).

9. The battery cell (1) according to any of the preceding claims 7 and 8, wherein at least one electrode of the at least one active material block (3, 4) is electrically conductively connected to the first connection (22) or to the second connection (23) arranged in the second interspace (20) by means of a discharger (24) extending from the active material block (3, 4) only in the region of the interspace (19, 20).

10. The battery cell (1) according to any of the preceding claims, wherein at least the bottom part (11) or at least the cover part (13) is connected in a material-bonded manner to the housing part (6).

11. The battery cell (1) according to any of the preceding claims, wherein the outer cover member (6) is an extruded profile.

12. The battery cell (1) according to any of the preceding claims, wherein the battery cell (1) has exactly one active material block (3), wherein the layers (5) of the active material block (3) are arranged wound around the core (10) in the circumferential direction (9).

13. The battery cell (1) according to any of the preceding claims 1 to 11, wherein the battery cell (1) has exactly two active material blocks (3, 4), wherein a first active material block (3) is arranged between the first side (15) and the housing piece (6) and a second active material block (4) is arranged between the second side (17) and the housing piece (6).