DE102021112444A1 - battery cell - Google Patents

Abstract

Battery cell (1), at least comprising a housing (2) and at least one block of active material (3, 4) arranged therein, the block of active material (3, 4) having a plurality of layers (5) comprising at least one anode, at least one cathode and having a separator between the different electrodes; wherein the housing (2) has a casing part (6) with an open first end face (7) and an open second end face (8), which completely encloses the at least one block of active material (3, 4) along a circumferential direction (9), and a core part (10) designed in one piece, wherein the core part (10) comprises a base part (11) arranged on the first end face (7) and connected to the casing part (6) and a base part (11) spaced therefrom along an axial direction (12) on the second end face (8) arranged and with the casing part (6) connected cover part (13) and the base part (11) with the cover part (13) connecting middle part (14).

Description

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

In particular, each block of active material has several anodes and cathodes and a separator between the different electrodes. The stacked cathodes, anodes and electrodes form a flat but large block of active material. Each electrode is connected to a conductor extending outwardly from the block of active material so that an electric current can be drawn from the block of active material or supplied to the block of active material. The conductors of the anodes and the conductors of the cathodes are respectively connected to each other in order to electrically connect the respective electrodes in parallel.

Batteries, in particular lithium-ion batteries, are increasingly being used to drive motor vehicles. Batteries are usually composed of battery cells and/or battery modules comprising several battery cells.

The blocks of active material are arranged individually or in groups in a housing, thus forming a battery cell. In particular, the most effective possible use of the installation space should be achieved. The value Wh/1 [watt hour per liter] is an important parameter of a battery cell. In the current construction of prismatic cells, a certain proportion of a housing volume can be used for a cell coil/cell stack.

Furthermore, a connection of the cell to the cooling in the system is very important. Current designs do not have a direct cooling path between the cell stack/cell coil or the block of active material for system cooling. Due to the current design with deep-drawn components as the housing, flexible formats can only be represented to a limited extent. In particular, there is a relationship between deep-drawing height and cell width.

In a current design of a battery cell, a cell stack/cell coil or a block of active material is arranged within a deep-drawn housing part. The deep-drawn housing part is connected to a cover group, which usually has a current collector for contacting the collector of an electrode type, a receiving grid for receiving and electrically insulating the current collector from the housing part, a connection for providing electrical contact between the current collector and the environment of the battery cell, and an insulator for isolating the connection from the housing.

The current design of prismatic cells with deep-drawn housing part and cover group results in the following restrictions: maximum space utilization of the housing of approx. 80% due to the contacting of the cover group with the arresters of the cell winding, restrictions on format dimensions due to deep-drawn housing part (dependence between cell thickness and cell depth ), poor thermal contact between the cell and the cooling system, costs of the assembly (deep-drawn housing part and cover group).

From the DE 10 2017 103 237 A1 a battery assembly having an extruded container is known.

From the EP 3 133 667 A1 a method for producing a battery cell is known.

From the DE 698 25 810 T2 a prismatic battery is known.

The object of the present invention is to at least partially solve the problems cited with reference to the prior art. In particular, a battery cell is to be proposed that can be produced inexpensively and allows effective use of the space in the housing.

A battery cell with the features according to patent claim 1 contributes to the solution of these tasks. Advantageous developments are the subject matter of the dependent patent claims. The features listed individually in the patent claims can be combined with one another in a technologically meaningful manner and can be supplemented by explanatory facts from the description and/or details from the figures, with further embodiment variants of the invention being shown.

• • ein Mantelteil mit einer offenen ersten Stirnseite und einer offenen zweiten Stirnseite, das den mindestens einen Block Aktivmaterial entlang einer Umfangsrichtung vollumfänglich umschließt, sowie
• • ein einteilig ausgeführtes Kernteil.

A battery cell is proposed, at least comprising a housing and at least one block of active material arranged therein. The block of active material has a plurality of layers, comprising at least one anode, at least one cathode and a separator between the different electrodes. The case includes

• • a casing part with an open first end face and an open second end face, which completely encloses the at least one block of active material along a circumferential direction, and
• • a one-piece core part.

The core part has a base part arranged on the first end face and connected to the casing part and a cover part arranged at a distance therefrom along an axial direction on the second end face and connected to the casing part, as well as a middle part connecting the base part to the cover part. The at least one block of active material is arranged on a first side of the center part along a radial direction between the shell part and the center part and on a second side of the center part opposite the first side between the shell part and the center part. The core part is an extruded profile.

In a known manner, a block of active material comprises in particular at least one anode and at least one cathode as electrodes. A separator is arranged between the anode and the cathode. The active materials are arranged in particular as coatings on electrically conductive carrier materials, which serve in particular as conductors. The anode, cathode and separator are each referred to as a layer.

In particular, the electrodes are arranged in a known manner to form the block of active material and are acted upon by an electrolyte or an electrolyte liquid.

In particular, a block of active material has a multiplicity of electrodes and separators which are stacked on top of one another or stacked and then wound together. The layers can be arranged as a single sheet stack, lamination, Z-fold, jelly roll, each in any number.

The electrodes are designed in particular in the form of foils, ie they have a large side surface and a small thickness. In particular, a coating with active material is arranged on the side surface or on each side surface of the electrode. The separators are each arranged between the side surfaces of the adjacently arranged different electrodes. In particular, uncoated parts of the electrodes extend out of the block of active material as conductors.

In particular, the anodes and the cathodes within the block of active material are connected in parallel with one another, so that the conductors of a plurality of anodes are electrically conductively connected to one another and the conductors of a plurality of cathodes are electrically conductively connected to one another.

The housing of the battery cell is in particular only plastically deformable. The housing is also referred to as a hard case and the battery cell z. B. as a prismatic cell.

The battery cell is in particular a lithium-containing battery cell, in particular a secondary cell, ie a rechargeable battery cell. The battery cell is arranged in particular in an insulating cell housing. In particular, the cell housing forms a cell insulation. The battery cell described below includes in particular this cell insulation.

In the case of the ready-to-use battery cell, the housing is in particular made in one piece. The housing consists of the shell part and the core part, which are only connected to one another during the manufacture of the housing, but are previously available as individual parts.

The casing part is in particular of cylindrical design, ie it only has surfaces running parallel to the axial direction.

The core part is an extruded profile and is produced by the known extrusion molding process.

In the extrusion process, a starting material is heated to a forming temperature and pressed through a shaping die at high pressure. The resulting profile is moved out of the die along a feed direction.

The cover part, the base part and the middle part or both sides each extend parallel to the feed direction. In the radial direction, i.e. transversely to the feed direction and to the axial direction, the cover part and the base part have a greater width than the middle part, in particular by a factor greater than 5, preferably greater than 10. The cover part and base part extend in particular perpendicularly to the middle part. The middle part has, in particular parallel to the width of the middle part, a minimal wall thickness of 0.2 to 5 millimeters, in particular at most 3 millimeters, preferably at most 2 millimeters. In particular, the cover part and base part have a very small wall thickness, for which the limits of the wall thickness of the central part also apply. However, the wall thickness of the individual parts can be different from one another.

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

In particular, aluminum or an aluminum alloy or other materials can be used as the material. The material used should in particular have good thermal conductivity, preferably comparable or higher than the thermal conductivity of aluminum.

In particular, the at least one block of active material is arranged in such a way that the layers in the area of the sides of the central part each extend parallel to the sides. If only one block of active material is provided, the layers can be wound around the central part. If two blocks of active material are provided, each block of active material can be arranged adjacent to the respective side.

To produce the battery cell, in particular the core part is first provided. The at least one block of active material is arranged on the core part, between the cover part and the base part. In this case, the at least one block of active material can be surrounded by electrical insulation.

The at least one block of active material can be arranged on the central part in particular via a type of clamp. The clamp can encompass the at least one block of active material on the outside and thus fix a width of the at least one block of active material. The width runs across the sides of the midsection. In particular, the at least one block of active material is arranged on the core part in such a way that it is arranged in alignment with the base part and possibly with the cover part along the axial direction.

The core part together with the at least one block of active material (in particular together with cell insulation) can be pushed into the casing part, in particular along the axial direction.

The base part can be connected to the casing part on the first end face, preferably in a materially bonded manner, e.g. B. by welding. In particular, the base part can be connected to the casing part at least at contact points formed with the casing part on the first end face. In this way, an at least liquid-tight, possibly also gas-tight connection can be produced between the casing part and the bottom part.

The cover part can be connected to the casing part at least at contact points formed with the casing part on the second end face, preferably in a materially bonded manner, e.g. B. by welding. In this way, an at least liquid-tight, possibly also gas-tight connection can be produced between the casing part and the cover part, at least along the material connection.

The housing is in particular cuboid. The side surfaces of the housing, which extend parallel to the sides of the central part, have the largest surfaces and are formed in particular by the casing part. The first and second end faces, on which the cover part and base part are arranged, can form the side surfaces with the smallest surfaces (preferably but not necessarily implemented in the second embodiment variant described below). Alternatively, the first and the second end face can be arranged adjoining the respective smallest surfaces and the respective largest surfaces (preferably but not necessarily implemented in the first embodiment variant described below).

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

In particular, a longitudinal direction, in particular the feed direction during the extrusion of the core part, runs perpendicularly to the axial direction and parallel to the sides of the middle part. In the longitudinal direction, the cover part has cover segments which are spaced apart from one another by a space in each case and via which the cover part is connected to the casing part on the second end face. In particular, the cover part has at least a first intermediate space and a second intermediate space (first embodiment variant).

In particular, a longitudinal direction, in particular the feed direction during the extrusion of the core part, runs perpendicularly to the axial direction and parallel to the sides of the middle part. The base part has a first intermediate space and at least one cover segment along the longitudinal direction, and the cover part has a second intermediate space and at least one cover segment along the longitudinal direction, the base part and the cover part being connected to the casing part on the respective end side via the at least one cover segment ( second variant).

According to the first embodiment variant of the battery cell, the at least two intermediate spaces are arranged on one (the second) end face. According to the second embodiment variant, the at least two intermediate spaces are arranged on opposite end faces.

In particular, the base part or the cover part has cover segments arranged spaced apart from one another along the longitudinal direction by the respective intermediate space.

In particular, at least the base part or the cover part, or both parts, each have two intermediate spaces. Electrical first connections or second connections can be arranged in each of the two intermediate spaces of a part be. In particular, two first connections, two second connections or a first connection and a second connection are therefore arranged in the two intermediate spaces of a part.

The internal resistance can be reduced as a result of the provision of a plurality of connections (that is to say a plurality of first connections and/or a plurality of second connections).

In particular, the cover part and base part are comparable, possibly even identical, and each have at least one gap or two gaps, possibly even more. Alternatively, the cover part has at least two gaps, while the bottom part is closed (without a gap). However, the cover part and base part can also have different numbers of gaps, ie none, one, two or even more.

In particular, the cover part is connected to the casing part via the cover segments or the at least one cover segment.

In particular, the comparably constructed base part is connected to the casing part via the at least one cover segment.

An intermediate space can be worked out of the cover part in particular by mechanical processing. In particular, the cover part or the base part has no gaps after extrusion.

In particular, the cover part and/or the base part extends along the longitudinal direction beyond the central part. In particular, the layers of a block of active material can thus extend from one side of the central part to the other side of the central part, in particular by winding the layers along the circumferential direction around the central part. The extension of the cover part and base part along the longitudinal direction is in particular designed in such a way that it just covers the extension of the at least one block of active material along the longitudinal direction.

With the connection of the core part and the casing part, the housing of the battery cell is produced. In the case of a materially bonded connection between the core part and the casing part, the housing is in particular designed in one piece, but is always made from at least two parts, namely the core part and the casing part.

In particular, at least one electrical first connection of the battery cell is arranged in a first intermediate space.

In particular, at least one electrical second connection of the battery cell is arranged in a second intermediate space.

In particular, at least one electrical second connection of the battery cell is arranged in a second intermediate space arranged separately from the first intermediate space by at least one cover segment (first embodiment variant).

The at least two electrical connections can therefore be arranged on one end face (first embodiment variant) or distributed over the two end faces (second embodiment variant).

Several electrical connections can also be arranged on each end face, or on only one of the end faces. In this case, identical or different connections can be arranged on one end face.

The battery cell described here with a core part can in particular have comparable dimensions (at least in two of three spatial dimensions, preferably in all spatial dimensions) as a conventional pouch cell with a deformable housing that has no core part. In particular, the electrical connections can be arranged on the housing in almost any configuration, so that the proposed battery cell can easily be adapted to arrangements provided for known battery cells.

An electrical connection serves to electrically contact the electrodes of the block of active material with an electrical circuit arranged outside of the battery cell. The block of active material can be charged and/or discharged via the electrical connection (or the connections).

In particular, the respective connection is electrically isolated from the housing. For example, the electrical connector may include a metal frame that is integral with the housing, e.g. B. cohesively, connectable or can be connected. The block of active material is electrically contacted in particular via an electrical contact that extends from the block of active material through the electrical connection to the area surrounding the battery cell. The electrical contact is arranged electrically insulated in particular from the metal frame, z. B. via a contact insulation.

In particular, the connection is arranged so that it is electrically isolated from the at least one block of active material by connection insulation. In particular, at least one connection can also be non-insulated with respect to the housing be assigned so that the housing has an electrical potential.

In particular, at least one electrode of the at least one block of active material is electrically conductively connected to the first connection or to a second connection arranged in the second gap via a conductor that extends out of the block of active material only in the region of the gap.

In particular, the conductors therefore only extend out of the block of active material or the cell insulation where the intermediate space or where the electrical contact to be contacted with the conductors is arranged. This means that a space between the block of active material and the cover part or the base part, which is otherwise necessary and has to be kept free for the arresters, only has to be kept free in the area of the contact. Since the intermediate space is present in this area, ie no cover part or base part, the cover part or base part can be arranged directly on the block of active material, ie without a gap to be provided. The respective connection can have the installation space required for contacting between arrester(s) and contact, or can be arranged in such a way that this installation space is available.

In particular, all conductors of one type of electrode, ie the anode or the cathode, are connected to one of the two terminals. All conductors of the other type of electrode are preferably connected to the other of the two terminals.

In particular, at least the base part or the cover part, preferably both parts, is integrally connected to the casing part.

The casing part is (also) preferably an extruded profile. In the case of the casing part, the feed direction during extrusion runs in particular along the axial direction. The explanations for extrusion or the core part, e.g. B. in relation to the wall thickness and / or the thermal conductivity, apply here equally.

The housing is in particular cuboid. The side surfaces of the housing, which extend parallel to the sides of the central part, have the largest surfaces and are formed in particular by the casing part. The side surfaces arranged on the first and second end faces are formed at least partially by the cover part and the base part. The other two side surfaces are in particular also formed by the casing part. These two side surfaces formed by the casing part therefore either have the smallest surfaces of the cuboid housing (preferably but not necessarily realized in the first embodiment variant described) or form the side surfaces which are arranged adjacent to the respective smallest surfaces and the respective largest surfaces (preferred but not necessarily implemented in the second embodiment variant described).

In particular, the battery cell has precisely one block of active material, with the layers of the block of active material being arranged wound around the core part along the circumferential direction.

According to another configuration, the battery cell has exactly two blocks of active material, with a first block of active material being arranged between the first side and the casing part and a second block of active material being arranged between the second side and the casing part.

In particular, the block of active material is electrically isolated from the core part and/or from the shell part, e.g. B. via a cell isolation. The cell insulation is included in the description of the dimensions of the active material block.

The at least one block of active material extends in particular over more than 95%, preferably over 98%, particularly preferably over 99%, of a minimum height extending along the axial direction between the bottom part and the cover part. In particular, the block of active material has an undersize of at most 1 millimeter, preferably of at most 0.5 millimeter compared to the smallest height. In particular, the at least one block of active material contacts the base part and the cover part at the same time.

This slight undersize is possible because very high accuracies can be achieved through extrusion, especially in the case of components calibrated after extrusion. So there is no play on the part of the active material block or in the design of the housing to allow for a later fit when the block of active material is arranged in the housing, e.g. B. with deep-drawn housing components to ensure.

A further advantage of the proposed housing design is that the extruded core part can ensure good heat dissipation from the block of active material to an area surrounding the battery cell. The configuration of the core part with a middle part is particularly advantageous, since the middle part extends through one block of active material or between the two blocks of active material.

The use of indefinite articles (“a”, “an”, “an” and “an”), particularly in the claims and the description reflecting them, should be understood as such and not as a numeral. Correspondingly introduced terms or components are to be understood in such a way that they are present at least once and in particular can also be present several times.

As a precaution, it should be noted that the numerals used here (“first”, “second”, ...) primarily (only) serve to distinguish between several similar objects, sizes or processes, i.e. in particular no dependency and/or sequence of these objects, sizes or make processes mandatory for each other. Should a dependency and/or order be necessary, this is explicitly stated here or it is obvious to the person skilled in the art when studying the specifically described embodiment. If a component can occur several times (“at least one”), the description of one of these components can apply equally to all or part of the majority of these components, but this is not mandatory.

• 1: eine bekannte Batteriezelle in einer Explosionsdarstellung in perspektivischer Ansicht;
• 2: eine Batteriezelle in einer Explosionsdarstellung in perspektivischer Ansicht (erste Ausführungsvariante);
• 3: ein Kernteil und zwei Blöcke Aktivmaterial der Batteriezelle nach 2 vor dem Zusammenbau, in einer perspektivischen Ansicht;
• 4: das Kernteil und die Blöcke Aktivmaterial nach 3, im zusammengebauten Zustand, in einer perspektivischen Ansicht;
• 5: das Kernteil und die Blöcke Aktivmaterial nach 4 sowie zwei elektrische Anschlüsse vor dem Zusammenbau, in einer perspektivischen Ansicht;
• 6: das Kernteil und die Blöcke Aktivmaterial sowie die zwei elektrischen Anschlüsse nach 5 während des Zusammenbaus, in einer perspektivischen Ansicht;
• 7: das Kernteil und Blöcke Aktivmaterial nach 6 sowie ein Mantelteil vor dem Zusammenbau zu dem Gehäuse, in einer perspektivischen Ansicht;
• 8: das Gehäuse nach 7, in einer perspektivischen Ansicht;
• 9: das Kernteil nach 2 und einen Block Aktivmaterial, in einer perspektivischen Ansicht;
• 10: das Kernteil und die Blöcke Aktivmaterial nach 4, in einer perspektivischen Ansicht;
• 11: die Batteriezelle nach 1 in einer perspektivischen Ansicht mit Schnittlinien XII-XII und XIII-XIII;
• 12: den Querschnitt XII-XII nach 11;
• 13: den Querschnitt XIII-XIII nach 11;
• 14: die Batteriezelle nach 2 in einer perspektivischen Ansicht mit Schnittlinien XV-XV und XVI-XVI;
• 15: den Querschnitt XV-XV nach 14;
• 16: den Querschnitt XVI-XVI nach 14; und
• 17: eine weitere Batteriezelle in einer Explosionsdarstellung in perspektivischer Ansicht (zweite Ausführungsvariante).

The invention and the technical environment are explained in more detail below with reference to the accompanying figures. It should be pointed out that the invention should not be limited by the exemplary embodiments given. In particular, unless explicitly stated otherwise, it is also possible to extract partial aspects of the facts explained in the figures and to combine them with other components and findings from the present description. In particular, it should be pointed out that the figures and in particular the proportions shown are only schematic. Show it:

• 1 1: a known battery cell in an exploded perspective view;
• 2 : a battery cell in an exploded perspective view (first embodiment);
• 3 : a core part and two blocks of active material of the battery cell 2 before assembly, in a perspective view;
• 4 : the core part and blocks active material after 3 , in the assembled state, in a perspective view;
• 5 : the core part and blocks active material after 4 and two electrical connectors before assembly, in a perspective view;
• 6 : the core part and the active material blocks as well as the two electrical connections 5 during assembly, in a perspective view;
• 7 : the core part and blocks active material after 6 and a casing part before assembly to form the housing, in a perspective view;
• 8th : the housing after 7 , in a perspective view;
• 9 : the core part after 2 and a block of active material, in a perspective view;
• 10 : the core part and blocks active material after 4 , in a perspective view;
• 11 : the battery cell after 1 in a perspective view with section lines XII-XII and XIII-XIII;
• 12 : according to cross-section XII-XII 11 ;
• 13 : according to cross-section XIII-XIII 11 ;
• 14 : the battery cell after 2 in a perspective view with section lines XV-XV and XVI-XVI;
• 15 : according to cross-section XV-XV 14 ;
• 16 : following the XVI-XVI cross-section 14 ; and
• 17 : Another battery cell in an exploded perspective view (second embodiment).

1 shows a known battery cell 1 in an exploded perspective view. In the current design of a battery cell 1, two blocks of active material 3, 4 are arranged within a deep-drawn casing part 6 (including the bottom part). The deep-drawn casing part 6 is connected to a cover group 28, which usually has a cover part 13, two current collectors 29 for contacting the conductors 24 of the electrodes, an insulating receiving grid 30 for receiving and electrically insulating the current collector 29 from the cover part 13, two connections 22, 23 for providing an electrical contact of the current collector 29 with an area surrounding the battery cell 1 and terminal insulation 26 for insulating each terminal 22, 23 from the cover part 13.

2 shows a battery cell 1 in an exploded perspective view. The battery cell 1 comprises a housing 2 and arranged therein a first block of active material 3 and a second block of active material 4. The blocks of active material 3, 4 each have a plurality of Layers 5 comprising at least one anode, at least one cathode and a separator between the different electrodes. The housing 2 comprises a jacket part 6 with an open first end face 7 and an open second end face 8, which completely encloses the blocks of active material 3, 4 along a circumferential direction 9, and a one-piece core part 10. The core part 10 has a on the first end face 7 and connected to the casing part 6 and a spaced-apart along an axial direction 12 thereto arranged on the second end face 8 and connected to the casing part 6 cover part 13 as well as a the base part 11 with the cover part 13 connecting middle part 14. The first block Active material 3 is on a first side 15 of the middle part 14 along a radial direction 16 between the casing part 6 and the middle part 14, and the second block of active material 4 is on a second side 17 of the middle part 14, opposite the first side 15, between the casing part 6 and the Central part 14 arranged. The core part 10 is an extruded profile.

The housing 2 is in the ready-to-use battery cell 1 (see 15 ) executed in one piece. The housing 2 is composed of the casing part 6 and the core part 10, which are only connected to one another during the manufacture of the housing 2, but are previously present as individual parts.

The casing part 6 is of cylindrical design, ie it only has surfaces running parallel to the axial direction 12 .

The housing 2 is cuboid. The side surfaces of the housing 2 extending parallel to the sides 15, 17 of the central part 14 have the largest surfaces and are formed by the casing part 6. The first end face 7 and the second end face 8 form the side surfaces which are arranged adjacent to the respective smallest surfaces and the respective largest surfaces. The other two side surfaces, which have the smallest surfaces, are also formed by the jacket part 6 .

The cover part 13, the base part 11 and the middle part 14 or both sides 15, 17 each extend parallel to the longitudinal direction 18. The cover part 13 and the base part 11 point in the radial direction 16, i.e. transversely to the longitudinal direction 18 and to the axial direction 12 , A greater width than the middle part 14 on. Cover part 13 and base part 11 extend perpendicularly to central part 14. The width of cover part 13 and base part 11 is designed such that it just covers the extension of blocks of active material 3, 4 along radial direction 16.

The blocks of active material 3, 4 are arranged in such a way that the layers 5 in the area of the sides 15, 17 of the central part 14 each extend parallel to the sides 15, 17. The two blocks of active material 3, 4 are each arranged adjacent to the respective side 15, 17.

The cover part 13 has cover segments 21 which are spaced apart from one another along the longitudinal direction 18 by a space 19 , 20 and via which the cover part 13 is connected to the casing part 6 on the second end face 8 .

The cover part 13 is connected to the casing part 6 via the cover segments 21 .

The cover part 13 extends along the longitudinal direction 18 beyond the central part 14 . The extension of the cover part 13 and base part 11 along the longitudinal direction 18 is designed in such a way that it just covers the extension of the blocks of active material 3 , 4 along the longitudinal direction 18 .

With the connection of the core part 10 and the casing part 6, the housing 2 of the battery cell 1 is produced. The housing 2 is designed in one piece with a material connection between the core part 10 and the casing part 6, but it is always made of at least two parts, namely the core part 10 and the casing part 6.

An electrical first connection 22 of the battery cell 1 is arranged in a first intermediate space 19 . An electrical second connection 23 of the battery cell 1 is arranged in a second intermediate space 20 arranged separately from the first intermediate space 19 by a cover segment 21 . The electrical connections 22, 23 serve to electrically contact the electrodes of the blocks of active material 3, 4 with a circuit arranged outside of the battery cell 1. The respective connection 22 , 23 is electrically insulated from the housing 2 . In this case, the electrical connection 22, 23 have a metallic frame which is connected to the housing 2, z. B. cohesively, connectable or can be connected. The blocks of active material 3 , 4 are electrically contacted via an electrical contact that extends from the blocks of active material 3 , 4 through the electrical connection 22 , 23 to the area surrounding the battery cell 1 . The electrical contact is arranged electrically isolated from the metallic frame, z. B. via a contact insulation 27. Each connection 22, 23 is arranged electrically isolated from the blocks of active material 3, 4 by a connection insulation 26.

Each electrode of the active material blocks 3, 4 is connected to the first terminal 22 or to the two th terminal 23 is electrically conductively connected via a conductor 24 that extends out of the block of active material 3, 4 only in the region of the intermediate space 19, 20.

The conductors 24 therefore only extend out of the block of active material 3, 4 or the cell insulation 25 where the intermediate space 19, 20 or where the electrical contact to be contacted with the conductors 24 is arranged.

The blocks of active material 3 , 4 are arranged on the central part 14 via a type of clamp 31 . The clamp 31 can encompass the blocks of active material 3, 4 on the outside and thus fix a width of the blocks of active material 3, 4. The width runs transversely to the sides 15, 17 of the central part 14. The blocks of active material 3, 4 are arranged on the core part 10 in such a way that they are aligned along the axial direction 12 with the base part 11 and with the cover part 13 or the cover segments 21 are arranged.

3 shows a core part 10 and two blocks of active material 3, 4 of the battery cell 1 2 before assembly, in a perspective view.

4 shows the core part 10 and the blocks of active material 3, 4 3 , in the assembled state, in a perspective view

To produce the battery cell 1, the core part 10 is first provided. The blocks of active material 3 , 4 are arranged on the core part 10 between the cover part 13 and the base part 11 . In this case, the blocks of active material 3 , 4 can be surrounded by electrical cell insulation 25 .

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

6 shows the core part 10 and the blocks of active material 3, 4 and the two electrical connections 22, 23 5 during assembly, in a perspective view. In the case of the second connection 23 it is shown that the conductors 24 are connected to the contact of the second connection 23 . The contacts 22, 23 are connected to the cover part 13 or the casing part 6 via weld seams 32.

7 shows the core part 10 and blocks active material 3, 4 after 6 and a casing part 6 before assembly to form the housing 2, in a perspective view.

8th shows the housing 2 7 , in a perspective view.

The core part 10 can be pushed into the casing part 6 together with the blocks of active material 3, 4 and the cell insulation 25, along the axial direction 12.

The base part 11 can be connected to the casing part 6 via a weld seam 32 on the first end face 7 . The cover part 13 can be connected to the casing part 6 via a weld seam 32 at contact points formed with the casing part 6 on the second end face 8 . The bottom part 11 closes the first end face 7 completely.

The casing part 6 is also designed as an extruded profile. The feed direction during extrusion runs along the axial direction 12 for the casing part 6.

9 shows the core part 10 after 2 and a block of active material 3, in a perspective view. The layers 5 of the block of active material 3 are wound around the core part 10 along the circumferential direction 9 .

10 shows the core part 10 and the blocks of active material 3, 4 4 , in a perspective view. Here the battery cell 1 has exactly two blocks of active material 3 , 4 , with a first block of active material 3 being arranged between the first side 15 and the casing part 6 and a second block of active material 4 being arranged between the second side 17 and the casing part 6 .

11 shows the battery cell 1 1 in a perspective view with section lines XII-XII and XIII-XIII. 12 shows the cross-section XII-XII 11 . 13 shows the cross-section XIII-XIII 11 . the 11 until 13 are described together below. On the comments on the 1 is referenced.

The section XII-XII runs outside the terminals 22, 23 transversely to the longitudinal direction 18 through the battery cell 1. The section XIII-XIII runs through the second terminal 23 transversely to the longitudinal direction 18 through the battery cell 1.

The large free space between the blocks of active material 3, 4 and the cover part 13 or the upper end of the deep-drawn casing part 6 can be seen. This large free space is due on the one hand to the larger tolerances of the deep-drawing and on the other hand to the connection of the arresters 24 with the ones in the cover part 13 arranged current collectors 29 due.

14 shows the battery cell 1 2 in a perspective view with section lines XV-XV and XVI-XVI. 15 shows the cross-section XV-XV 14 . 16 shows the cross section XVI-XVI 14 . the 14 until 16 are described together below. On the remarks on the 2 until 8th is referenced.

The section XV-XV runs outside the terminals 22, 23 transversely to the longitudinal direction 18 through the battery cell 1. The section XVI-XVI runs through the second terminal 23 transversely to the longitudinal direction 18 through the battery cell 1.

The blocks of active material 3, 4 extend over more than 99% of a minimum height 33 extending along the axial direction 12 between the base part 11 and the cover part 13. The blocks of active material 3, 4 can contact the base part 11 and the cover part 13 at the same time, if necessary . The conductors 24 are only arranged in the area of the gaps 19, 20 and make contact with the contact of the respective connection 22, 23.

The middle part 14 can be used for the effective cooling of the blocks of active material 3, 4.

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

the 17 shows a further battery cell 1 in an exploded perspective view (second embodiment variant). Here the first connection 22 is arranged in a first intermediate space 19 of the base part 11 and the second connection 23 is arranged in a second intermediate space 20 of the cover part 13 .

A longitudinal direction 18 runs perpendicular to the axial direction 12 and parallel to the sides 15, 17 of the central part 14. The base part 11 has a first intermediate space 19 along the longitudinal direction 18 and two cover segments 21 arranged spaced apart from one another, and the cover part 13 has a second space along the longitudinal direction 18 Space 20 and two spaced-apart cover segments 21 on. The base part 11 and the cover part 13 are connected to the casing part 6 at the respective end face 7 , 8 via the cover segments 21 .

The cover part 13 and the bottom part 11 of the core part 10 are of identical design and each have an intermediate space 19, 20. The in the 12 and 13 15 and 16 of the cover part 13 are designed comparably on a base part 11 or cover part 13 with only one electrical connection 22, 23 each.

The housing 2 is cuboid. The side surfaces of the housing 2 extending parallel to the sides 15, 17 of the central part 14 have the largest surfaces and are formed by the casing part 6. The first end face 7 and the second end face 8, on which the cover part 13 and the base part 11 are arranged, form the side surfaces with the smallest surfaces. The other two side surfaces, which are arranged adjacent to the respective smallest surfaces and the respective largest surfaces, are also formed by the casing part 6 .

Reference List

1

battery cell

2

Housing

3

first block of active material

4

second block active material

5

location

6

jacket part

7

first face

8th

second face

9

circumferential direction

10

core part

11

bottom part

12

axial direction

13

cover part

14

center part

15

first page

16

radial direction

17

second page

18

longitudinal direction

19

first space

20

second space

21

cover segment

22

first connection

23

second connection

24

arrester

25

cell isolation

26

terminal insulation

27

contact insulation

28

cover group

29

current collector

30

intake grid

31

bracket

32

Weld

33

Height

QUOTES INCLUDED IN DESCRIPTION

This list of the documents cited 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 102017103237 A1 [0008]
• EP 3133667 A1 [0009]
• DE 69825810 T2 [0010]

Claims (13)

Battery cell (1), at least comprising a housing (2) and at least one block of active material (3, 4) arranged therein, the block of active material (3, 4) having a plurality of layers (5) comprising at least one anode, at least one cathode and having a separator between the different electrodes; wherein the housing (2) has a casing part (6) with an open first end face (7) and an open second end face (8), which completely encloses the at least one block of active material (3, 4) along a circumferential direction (9), and a core part (10) designed in one piece, wherein the core part (10) comprises a base part (11) arranged on the first end face (7) and connected to the casing part (6) and a base part (11) spaced therefrom along an axial direction (12) on the second end face (8) arranged and with the casing part (6) connected cover part (13) and the base part (11) with the cover part (13) connecting middle part (14); wherein the at least one block of active material (3, 4) on a first side (15) of the middle part (14) along a radial direction (16) between the casing part (6) and the middle part (14) and on one, the first side ( 15) opposite second side (17) of the middle part (14) is arranged between the shell part (6) and the middle part (14); wherein the core part (10) is an extruded profile. Battery cell (1) after Claim 1 , wherein the bottom part (11) completely closes the first end face (7). Battery cell (1) according to one of the preceding claims, wherein a longitudinal direction (18) perpendicular to the axial direction (12) and parallel to the sides (15, 17) of the central part (14); the cover part (13) having cover segments (21) spaced apart from one another along the longitudinal direction (18) by a space (19, 20), via which the cover part (13) is connected to the casing part (6) on the second end face (8) connected is; wherein the cover part (13) has at least a first intermediate space (19) and a second intermediate space (20). Battery cell (1) after Claim 1 wherein a longitudinal direction (18) is perpendicular to the axial direction (12) and parallel to the sides (15, 17) of the central part (14); wherein the base part (11) along the longitudinal direction (18) has a first intermediate space (19) and at least one cover segment (21) and the cover part (13) along the longitudinal direction (18) has a second intermediate space (20) and at least one cover segment (21) wherein the base part (11) and the cover part (13) are connected to the casing part (6) on the respective end face (7, 8) via the at least one cover segment (21). Battery cell (1) after patent claim 4 wherein the base part (11) or the cover part (13) along the longitudinal direction (18) through the respective intermediate space (19, 20) spaced from each other cover segments (21). Battery cell (1) according to any one of the preceding patent claims 3 until 5 , wherein at least the base part (11) or the cover part (13) each have two intermediate spaces (19, 20). Battery cell (1) according to any one of the preceding patent claims 3 until 6 , wherein at least one electrical first connection (22) of the battery cell (1) is arranged in a first intermediate space (19). Battery cell (1) according to any one of the preceding patent claims 3 until 7 , wherein at least one electrical second connection (23) of the battery cell (1) is arranged in the second intermediate space (20). Battery cell (1) according to any one of the preceding Claims 7 and 8th , wherein at least one electrode of the at least one block of active material (3, 4) is connected to the first connection (22) or to a second connection (23) arranged in the second intermediate space (20) via a connection located only in the region of the intermediate space (19, 20 ) from the block of active material (3, 4) extending out conductor (24) is electrically conductively connected. Battery cell (1) according to one of the preceding claims, wherein at least the base part (11) or the cover part (13) is materially connected to the casing part (6). Battery cell (1) according to one of the preceding claims, wherein the casing part (6) is an extruded profile. Battery cell (1) according to one of the preceding claims, wherein the battery cell (1) has exactly one block of active material (3), the layers (5) of the block of active material (3) along the circumferential direction (9) around the core part (10). are arranged wound. Battery cell (1) according to any one of the preceding patent claims 1 until 11 , wherein the battery cell (1) has exactly two blocks of active material (3, 4), with a first block of active material (3) between the first side (15) and the casing part (6) and a second block of active material (4) between the second side (17) and the casing part (6) is arranged.

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