WO2023031297A1 - Élément de batterie, ensemble batterie et procédé pour produire un élément de batterie - Google Patents

Élément de batterie, ensemble batterie et procédé pour produire un élément de batterie Download PDF

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Publication number
WO2023031297A1
WO2023031297A1 PCT/EP2022/074241 EP2022074241W WO2023031297A1 WO 2023031297 A1 WO2023031297 A1 WO 2023031297A1 EP 2022074241 W EP2022074241 W EP 2022074241W WO 2023031297 A1 WO2023031297 A1 WO 2023031297A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
stack
battery cell
conductors
partial
Prior art date
Application number
PCT/EP2022/074241
Other languages
German (de)
English (en)
Inventor
Bastian Schaar
Mesut Yurtseven
Lukas Kwoczek
Benjamin Bedürftig
Anish GAUSH
Jan Teuwsen
Michael Lang
Rudolf Pape
Original Assignee
Volkswagen Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Volkswagen Aktiengesellschaft filed Critical Volkswagen Aktiengesellschaft
Priority to CN202280059448.3A priority Critical patent/CN117916944A/zh
Priority to EP22773139.5A priority patent/EP4396897A1/fr
Publication of WO2023031297A1 publication Critical patent/WO2023031297A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/545—Terminals formed by the casing of the cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell

Definitions

  • Battery cell battery arrangement and method for manufacturing a battery cell
  • the invention relates to a battery cell, at least comprising a dimensionally stable housing and arranged therein a plurality of layers at least stacked on top of each other, comprising at least one anode and at least one cathode as electrodes and a separator between the different electrodes.
  • the layers form at least one stack.
  • First electrodes ie, for example, anodes or cathodes
  • second electrodes ie, for example, cathodes or anodes
  • the respective arresters extend out of the stack.
  • each electrode has a conductor extending outwardly from the stack so that an electrical current can be drawn from or supplied to the stack.
  • each electrode comprises a current collector which has active material in a coated area. The uncoated area serves as an arrester.
  • the current collector is usually made of aluminum and in the case of anodes it is made of copper (or corresponding alloys).
  • the conductors of the anodes and the conductors of the cathodes are in particular connected to one another in an electrically conductive manner in order to electrically connect the respective electrodes in parallel.
  • Several stacks can also be arranged in the battery cell.
  • 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.
  • a battery cell 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 at least stacked on top of one another.
  • the housing comprises 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 core part designed in one piece.
  • the core part instructs a 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 middle part along a radial direction between the casing part and the middle part and on a second side of the middle part opposite the first side between the casing part and the middle part.
  • the core part is an extruded profile.
  • This type of battery cell enables effective use of space, so a high value is achieved for this parameter in Wh/I [watt hour per liter].
  • the core part which is designed as an extruded profile and is proposed in DE 10 2021 112 444.1, allows heat generated in the housing to be easily dissipated.
  • Battery cells in a prismatic design i.e. with dimensionally stable housings
  • a cooling or temperature control device via a housing base.
  • the heat generated inside the battery cell, ie inside the housing is dissipated first along the stacking direction of the electrodes to the housing and then along the housing walls to the housing base.
  • the thermal conductivity in the stacking direction used here is significantly lower than in the longitudinal direction, ie along the extension of the current collectors of the electrodes. This results in high temperature gradients from the inside to the outside and the total thickness or stack height of the battery cell that can be achieved is limited. Furthermore, this thermal path requires a certain minimum thickness of the housing walls.
  • US 2020/144676 A1 proposes an embodiment in which an electrode of the electrode coil protrudes beyond this to the bottom of the housing and is electrically and thermally connected there by means of a Contacting intermediate element is contacted. In this way, efficient heat dissipation to the bottom of the housing can be achieved along the highly thermally conductive direction of the winding.
  • the conduction of a potential on the housing can be found regularly in prismatic cells.
  • prismatic battery cells limits the size of the battery cell that can be represented and thus causes a cost disadvantage for the cells (high proportion of passive components such as housing, terminals, etc.). Thick walls in prismatic battery cells limit the achievable gravimetric and volumetric energy density.
  • Thick walls in prismatic battery cells limit the achievable gravimetric and volumetric energy density of the battery cells.
  • a battery module with a multiplicity of interconnected pouch cells is known from WO 2019/213717 A1.
  • KR 10 2242274 A discloses a prismatic cell and its conductor structure.
  • a battery and a method for manufacturing the battery are known from DE 10 2018 203 052 A1.
  • the conductors of the electrodes are arranged on a common side of the stack of stacked electrodes.
  • the object of the present invention is to at least partially solve the problems cited with reference to the prior art.
  • a battery cell or a battery arrangement is to be proposed which can be produced inexpensively, enables effective use of space in the housing and ensures improved temperature control of the battery cell or the stack arranged in the housing.
  • a method for producing such a battery cell is also to be proposed.
  • a battery cell with the features according to patent claim 1, a battery arrangement according to patent claim 7 and a method according to patent claim 10 contribute 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.
  • a battery cell at least comprising a dimensionally stable housing with at least one electrical first connection that is electrically insulated from the housing and at least one stack composed of at least two partial stacks arranged in the housing.
  • Each partial stack has a plurality of layers at least stacked on top of one another, the layers comprising at least one anode and at least one cathode as electrodes and a separator between the different electrodes.
  • First electrodes ie, for example, anodes or cathodes
  • first collectors ie, for example, cathodes or anodes
  • second electrodes ie, for example, cathodes or anodes
  • the respective arresters extend out of the stack.
  • the first arresters of the partial stacks are arranged on a common first side surface of the stack and the second arresters of the partial stacks are arranged on a common second side surface of the stack.
  • the first conductors are electrically conductively connected to a first housing side of the housing and the second conductors of the stack are electrically conductively connected to the at least one first connection.
  • the at least stacked, possibly additionally wound or folded, cathodes, anodes and separators each form a partial stack.
  • the at least two sub-stacks form in particular a stack, with the first arresters and the second arresters of the stack being connected in parallel with one another in each case.
  • the electrodes have active materials, in particular as coatings on electrically conductive carrier materials, with the uncoated areas of the carrier materials serving in particular as conductors.
  • the anode, the cathode and separator are each referred to as a layer.
  • the layers can be arranged as a single sheet stack, lamination, Z-fold, jelly roll, each in any number.
  • each electrode is connected to an arrester which extends outwards from the sub-stack or stack, so that an electric current can be supplied to or from the stack.
  • the conductors of the anodes and the conductors of the cathodes are each connected to one another in order to electrically connect the respective electrodes of the same type in parallel.
  • Several stacks can also be arranged in the battery cell. Preferably, however, only one stack composed of exactly two sub-stacks is arranged in the housing.
  • the electrodes are arranged in a known manner to form the stack and are acted upon by an electrolyte or an electrolyte liquid.
  • the electrodes are designed in particular in the form of foils, ie they have a large side surface and a small thickness.
  • 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 stack as conductors.
  • the anodes and the cathodes within the stack 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 housing is cuboid and has six sides of the housing.
  • the term "prismatic" can also be used to transform other, essentially cuboid, housing shapes, e.g. B. have rounded edges.
  • the housing is designed at least partially as a deep-drawn part, as a die-cast part, as an extruded profile, as an extruded part or as a welded construction. It is also possible to manufacture two half-shells and to connect them, e.g. B. by welding. One Manufacture by additive manufacturing processes, e.g. B. by three-dimensional printing is of course also possible.
  • the housing consists of the first housing side and a partial housing, the first housing side and partial housing together forming the housing.
  • the partial housing therefore has, in particular, five sides of the housing.
  • 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.
  • a liquid starting material is introduced into a mold negative and demolded after solidification.
  • the battery cell is in particular a secondary cell, ie a rechargeable battery cell, preferably a lithium-containing battery cell.
  • each sub-stack has first and second arresters, which are each connected to one another in an electrically conductive manner.
  • the layers of each partial stack are fixed in their alignment with one another, e.g. B. via fixing straps, z. B. Tape.
  • the first arresters of the partial stacks are arranged on a common first side surface of the stack and the second arresters of the partial stacks are arranged on a common second side surface of the stack.
  • the respective conductors of one type of electrode are each arranged on a separate side surface of the stack or partial stack, so that the respective conductors can also extend out of the partial stack over a greater or even the entire extent of the partial stack. Due to the arrangement of the arresters on different side surfaces and the greater connection of the arresters to the areas of the electrodes coated with the active material, current density hotspots in the partial stack and on the arresters can be prevented during operation of the battery cell.
  • the first conductors are electrically conductively connected to a first housing side of the housing and the second conductors of the stack are electrically conductively connected to the at least one first connection.
  • the current flow from and to one type of electrode thus takes place at least partially via the housing or a plurality of housing sides. So the current also flows outside of the at least one first terminal via an outer peripheral surface of the housing.
  • the first connection is arranged on a second housing side of the housing.
  • the first connection is therefore arranged in particular on a housing side other than the first.
  • a second side of the housing is electrically conductively connected to the first conductors via the first side of the housing.
  • a second connection is therefore (also) arranged on the second side of the housing, which can be contacted via a circuit.
  • the second connection is not electrically insulated from the housing.
  • the battery cell can be connected to a circuit via a single side of the housing.
  • the first connection is arranged on a second side of the housing, which is arranged adjacent to or at a distance from the first side of the housing.
  • the first connection is arranged on a second side of the housing, which is arranged opposite the first side of the housing, the second side of the housing being electrically conductively connected to the first conductors via at least a third side of the housing and the first side of the housing.
  • a second connection is also arranged on the second side of the housing, which can be contacted via a circuit.
  • a spatial separation of the function of temperature control or cooling of the battery cell and the function of electrical contacting of the sub-stacks can also be implemented. Effective temperature control can take place via the first side of the housing, while the electrical contacting of the battery cell takes place via the second side of the housing.
  • electrical contacting of the first arresters with the first side of the housing extends at least over at least 50%, in particular over at least 75%, preferably over at least 85%, of an inner surface of the first facing the stack case side.
  • the electrical contacting is implemented by the first arresters of the first partial stack and the second partial stack.
  • the first conductors of the first sub-stack and the first conductors of the second sub-stack can contact the inner surface in different areas or be connected to one another and then at least partially contact the inner surface in a common area.
  • the electrical contact is made over at least 50% of the inner surface of the first side of the housing.
  • the inner surface of the first housing side is delimited in particular by the other housing sides of the housing or the partial housing.
  • the inner surface can be determined in particular on the first housing side, which is present as a single part, before the housing is assembled.
  • a battery arrangement is also proposed, at least comprising the battery cell described and an electrical circuit, arranged in particular outside the housing, for the electrical connection of the battery cell to a consumer, and a temperature control device for temperature control of the battery cell.
  • the first conductors of the partial stacks are arranged on a common first side surface of the stack and the second conductors of the partial stacks are arranged on a common second side surface of the stack.
  • the first conductors are electrically conductively connected to a first housing side of the housing and the second conductors of the stack are electrically conductively connected to the at least one first connection.
  • the first connection is arranged on a second housing side of the housing.
  • the circuit makes contact with the battery cell via the first connection and via the housing as a second connection, and the temperature control device makes contact with the battery cell via a different side of the housing than the second side of the housing.
  • a spatial separation of the function of temperature control or cooling of the battery cell and the function of electrical contacting of the sub-stacks can be implemented.
  • the second connection is arranged on the second side of the housing, i. H. the circuit makes contact with the housing, i.e. via the second connection, in the area of the second side of the housing.
  • the temperature control device makes thermally conductive contact with the battery cell at least or exclusively via the first side of the housing.
  • the temperature control device comprises in particular a heat exchanger through which a fluid flows.
  • a fluid e.g. B. a cooling liquid or air
  • heat can be removed or added.
  • the temperature of the battery cell can be controlled via the thermally conductive contact, i.e. it can be cooled or, if necessary, heated.
  • a method for producing the battery cell described is also proposed, at least comprising the following steps a) providing a first partial stack and a second partial stack and a first housing side; each partial stack having a plurality of layers at least stacked on top of each other, each comprising at least one anode and at least one cathode as electrodes and a separator between the different electrodes; first electrodes having first conductors and second electrodes having second conductors extending out of the stack; b) arranging the sub-stacks relative to the first side of the housing and connecting the first conductors to the first side of the housing to form an assembly; c) merging the partial stacks to form the stack, the first conductors being arranged on a common first side surface of the stack and the second conductors being arranged on a common second side surface of the stack; d) arranging the assembly on or in a partial housing and electrically conductively connecting the first housing side to the partial housing to form the housing; e) connecting the second arresters to a first connection
  • step b) the first conductors of each partial stack are connected to the first side of the housing in areas that differ from one another.
  • the first conductors of the respective partial stack are already connected to one another before step b) and are then connected to the first side of the housing as a one-piece element in step b).
  • the first arresters are connected to the first side of the housing by a welding process, so that an integral connection is realized.
  • the sub-stacks are folded together in step c) and thus combined to form the stack. In this way, in step b), the connection between the first conductors and the first housing side can be made accessible if the partial stacks are arranged in an unfolded arrangement relative to the first housing side.
  • the partial stacks are fixed to one another between steps c) and d), e.g. B. by a shell.
  • the shell can enclose the stack formed in this way and, in particular, electrically insulate it from the housing.
  • at least the second conductors extend through the sleeve and can thus be connected to the first connection in accordance with step e).
  • the assembly comprising the stack and the first housing side, is arranged in or on a partial housing or brought together with a partial housing.
  • the first side of the housing is electrically conductively connected to the partial housing.
  • the first arresters can thus be electrically contacted via housing sides other than the first housing side.
  • a circuit can contact a second side of the housing, so that the first conductors are electrically conductively contacted via the partial housing and the first side of the housing.
  • the partial housing includes all remaining sides of the housing, except for the first side of the housing.
  • the second arresters are connected to a first connection arranged on a second housing side of the housing.
  • This connection can be made in a way that is basically known.
  • the second conductor can be z. B. extend out of the stack only opposite to the first terminal.
  • the space utilization of the housing can thus be increased, since free space for the second conductor only has to be reserved in the area of the first connection.
  • the second arresters can also extend out of the stack over a larger area of the side surface of the stack and z. B. be connected via a guide element with the first port.
  • the first connection preferably each connection, comprises in particular at most 5% of an outer surface of the housing. In particular, at least 50% of the outer surface of the housing is electrically conductively connected to the first conductors.
  • the first connection is arranged in particular electrically insulated from this outer surface of the housing, which is electrically conductively connected to the first conductors.
  • an improved heat dissipation path can be provided along the electrically and thermally well-suffering direction of the stack (along the surfaces of the electrodes or transverse to the stacking direction), directly to the first side of the housing, with the first side of the housing being preferred is arranged on a temperature control device.
  • the at least one separator is folded in the stack in the manner of a z-fold, with the separator on the first side surface extending over the at least one type of electrode, so that these electrodes are each arranged separately from the first housing side via the separator .
  • the stack of electrodes is arranged in the housing and the housing is filled with an electrolyte in particular.
  • the sub-stacks are provided in particular as part of a pre-assembly, the position of the electrodes and the separators being fixed by at least one means, e.g. B. a tape, so an adhesive tape material is fixed.
  • a pre-assembly the position of the electrodes and the separators being fixed by at least one means, e.g. B. a tape, so an adhesive tape material is fixed.
  • the housing of the battery cell has, in particular on one side of the housing, in particular on the second side of the housing, a so-called bursting protection which forms a predetermined failure point of the housing to reduce the pressure in the event of an impermissible increase in pressure within the housing.
  • the housing has at least one filling opening for filling with an electrolyte there or on another side of the housing, preferably on a third side of the housing.
  • the statements regarding the battery cell can be transferred in particular to the battery arrangement and the method, and vice versa.
  • indefinite articles (“a”, “an”, “an” and “an”), particularly in the claims and the description reflecting them, is to be understood as such and not as a numeral.
  • indefinite articles (“a”, “an”, “an” and “an”), particularly in the claims and the description reflecting them, is to 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.
  • 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. Insofar as a plurality of components is addressed here, this also includes more than two components.
  • Fig. 2 an assembly, at least comprising the housing side according to Fig. 1 and two
  • Fig. 3 arranging the assembly of FIG. 2 in a case, in a perspective
  • FIG. 4 the arrangement of the assembly with the cover according to FIG. 3 in a partial housing, in a perspective view;
  • FIG. 5 shows the battery cell according to FIG. 4 and the connection of the second conductor to the first connection, in a perspective view
  • FIGS. 4 and 5 shows the battery cell according to FIGS. 4 and 5 in a perspective view
  • FIG. 7 shows a first variant of the contacting of the second arrester with the first connection; in a section VI I-VII of Fig. 6;
  • FIG. 8 shows a second variant of the contacting of the second arrester with the first connection; in a section VI I-VII of Fig. 6;
  • FIG. 9 shows the battery cell according to FIGS. 4 to 7 in a section IX-IX according to FIG. 6;
  • Fig. 11 the battery cell according to Fig. 4 to 8 in a section XI-XI according to Fig. 6.
  • FIG. 1 shows a first housing side 12 in a perspective view.
  • FIG. 2 shows an assembly 21, at least comprising the first housing side 12 according to FIG. 1 and two partial stacks 4, 5, in a perspective view.
  • FIG. 3 shows the arrangement of the assembly 21 according to FIG. 2 in a cover 25, in a perspective representation.
  • Fig. 4 shows the arrangement of the assembly 21 with the sleeve 25 of FIG. 3 in a partial housing 22, in a perspective view.
  • FIG. 5 shows the battery cell 1 according to FIG. 4 and the connection of the second conductor 9 to the first connection 3 in a perspective view.
  • 6 shows the battery cell 1 according to FIGS. 4 and 5 in a perspective view. 1 to 6 are described together below.
  • the battery cell 1 comprises a dimensionally stable housing 2 with at least one electrical first connection 3 that is electrically insulated from the housing 2 and a stack 6 composed of two sub-stacks 4, 5 arranged in the housing 2.
  • Each sub-stack 4, 5 has a plurality of stacks stacked on top of one another Layers 7, the layers 7 comprising a plurality of anodes and a plurality of cathodes as electrodes and a separator between the different electrodes.
  • First electrodes ie, for example, anodes or cathodes
  • first conductors 8 and second electrodes ie, for example, cathodes or anodes
  • second conductors ie, for example, cathodes or anodes
  • the respective conductors 8, 9 extend out of the stack 6.
  • the first arresters 8 of the partial stacks 4 , 5 are arranged on a common first side surface 10 of the stack 6 and the second arresters 9 of the partial stacks 4 , 5 are arranged on a common second side surface 11 of the stack 6 .
  • the first arresters 8 are electrically conductively connected to the first housing side 12 of the housing 2 and the second arresters 9 of the stack 6 to the one first connection 3 .
  • the stacked cathodes, anodes and separators each form a sub-stack 4, 5.
  • the two sub-stacks 4, 5 form a stack 6, with the first conductor 8 and the second conductor 9 of the stack 6 being connected in parallel with one another.
  • Each electrode is connected to a conductor 8, 9 extending outwards from the sub-stack 4, 5 or stack 6, so that an electric current can be drawn from the stack 6 or fed to the stack 6.
  • the conductors 8, 9 of the anodes and the conductors 9, 8 of the cathodes are each connected to one another in order to electrically connect the respective electrodes of the same type in parallel.
  • the housing 2 is cuboid and has six sides 12, 13, 14 of the housing.
  • the housing 2 consists of the first housing side 12 and a partial housing 22, the first housing side 12 and partial housing 22 forming the housing 2 together.
  • the partial housing 22 therefore has five housing sides 13, 14.
  • Each sub-stack 4, 5 has first conductors 8 and second conductors 9, which are each connected to one another in an electrically conductive manner.
  • the layers 7 of each sub-stack 4, 5 are fixed in their alignment with one another via fixing straps 27.
  • the first arresters 8 of the partial stacks 4 , 5 are arranged on a common first side surface 10 of the stack 6 and the second arresters 9 of the partial stacks 4 , 5 are arranged on a common second side surface 11 of the stack 6 .
  • the respective conductors 8, 9 of one type of electrode are each arranged on their own side surface 10, 11 of the stack 6 or partial stack 4, 5, so that the respective conductors 8, 9 extend over a larger or even the entire extent of the partial stack 4, 5 can extend out of the partial stack 4, 5 (see in particular the first conductor 8 in FIG. 2).
  • the conductors 8, 9 on different side surfaces 10, 11 and the greater connection of the conductors 8, 9 to the areas of the electrodes coated with the active material, current density hotspots can occur in the partial stack 4, 5 and on the conductors during operation of the battery cell 1 8, 9 can be prevented.
  • the first conductors 8 are electrically conductively connected to a first housing side 12 of the housing 2 and the second conductors 9 of the stack 6 are electrically conductively connected to the first connection 3 .
  • the current flow from and to one type of electrode thus takes place at least partially via the housing 2 or a plurality of housing sides 12, 13, 14. In this case, the current also flows outside of the first connection 3 via an outer peripheral surface of the housing 2.
  • a second connection 20 is arranged on the second housing side 13 and can be contacted via a circuit 17 (see FIG. 6).
  • the second connection 20 is not electrically insulated from the housing 2 . Since the first connection 3 is also arranged on the second side 13 of the housing, the battery cell 1 can be connected to the circuit 17 via a single side 13 of the housing.
  • the first connection 3 is arranged on a second housing side 13 , which is arranged opposite the first housing side 12 , the second housing side 13 being electrically conductively connected to the first conductors 8 via a third housing side 14 and the first housing side 12 .
  • a more homogeneous heat distribution in the stack 6 and thus current density hotspots in the partial stacks 4, 5 and on the conductors 8, 9 can be prevented during operation of the battery cell 1, since the current flow to the different poles takes place in opposite directions.
  • a spatial separation of the function of temperature control or cooling of the battery cell 1 and the function of making electrical contact with the partial stacks 4, 5 can thus be implemented.
  • Effective temperature control takes place via the first housing side 12
  • the electrical contacting of the battery cell 1 takes place via the second housing side 13 .
  • the first conductors 8 of the first partial stack 4 and the first conductors 8 of the second partial stack 5 contact the inner surface 15 of the first housing side 12 in different areas (see FIGS. 2 and 10).
  • the inner surface 15 of the first housing side 12 is delimited by the other housing sides 13, 14 of the housing 2 and the partial housing 22, respectively.
  • a battery assembly 16 is shown schematically. This includes the battery cell 1 and an electrical circuit 17 arranged outside of the housing 2 for the electrical connection of the battery cell 1 to a load 18 and a temperature control device 19 for temperature control of the battery cell 1.
  • the circuit 17 contacts the battery cell 1 via the first connection 3 and via the housing 2 as a second connection 20 and the temperature control device 19 contacts the battery cell 1 via the first housing side 12. This allows a spatial separation of the temperature control or cooling function of the battery cell 1 and the function of making electrical contact with the partial stacks 4, 5 or the battery cell 1.
  • the second terminal 20 is arranged on the second housing side 13, i. H. the circuit 17 contacts the housing 2, i.e. via the second connection 20, in the area of the second housing side 13.
  • step a) of the method for producing the battery cell 1 a first partial stack 4 and a second partial stack 5 and a first housing side 12 are provided (see FIGS. 1 and 2).
  • step b) the partial stacks 4, 5 are arranged relative to the first housing side 12 and the first arresters 8 are connected to the first housing side 12 to form an assembly 21 (see FIG. 2).
  • step c) the sub-stacks 4, 5 are combined to form the stack 6, with the first conductors 8 being arranged on a common first side surface 10 of the stack 6 and the second conductors 9 being arranged on a common second side surface 11 of the stack 6 (see Fig 3).
  • the sub-stacks 4, 5 are folded together in step c) and thus combined to form the stack 6.
  • step b) the connection between the first conductors 8 and the first housing side 12 can be made accessible when the partial stacks 4 , 5 are arranged in an unfolded arrangement relative to the first housing side 12 .
  • the partial stacks 4, 5 are fixed to one another between steps c) and d) by a sleeve 25 (see FIG. 3).
  • the shell 25 encloses the stack 6 formed in this way and electrically insulates the stack 6 from the housing 2 .
  • the second conductors 9 extend through the sleeve 25 and can thus be connected to the first connection 3 according to step e) (see FIGS. 4 and 5).
  • step d) the assembly 21 is arranged on or in a partial housing 22 and the first housing side 12 is electrically conductively connected to the partial housing 22 to form the housing 2 (see FIG. 4).
  • the second arresters 9 are connected to a first connection 3 arranged on a second housing side 13 of the housing 2.
  • the stack 6 of electrodes is arranged in the housing 2 and the housing 2 is filled with an electrolyte.
  • the partial stacks. 4, 5 are provided as part of a pre-assembly, the position of the electrodes and the separators being fixed by fixing means, a fixing strap 27.
  • fixing the positions of the layers 7 to one another handling of the partial stacks 4, 5 can be simplified, so that a dimensionally accurate arrangement of the electrodes in the partial stack 4, 5 and thus in the stack 6 and in the housing 2 is made possible.
  • the housing 2 of the battery cell 1 has a so-called bursting protection 23 on the second housing side 13, which forms a predetermined failure point of the housing 2 for pressure reduction in the event of an impermissible increase in pressure within the housing 2. Furthermore, the housing 2 has a filling opening 24 for filling with an electrolyte.
  • FIG. 7 shows a first embodiment variant of the contacting of the second arrester 9 with the first connection 3. Reference is made to the explanations relating to FIGS.
  • the second conductors 9 of each sub-stack 4, 5 are connected to one another and extend towards a conducting element 26.
  • the conducting element 26 is connected directly to the first connection 3.
  • the first connection 3 is connected to the housing 2 via insulation 29 .
  • the second arresters 9 extend out of the stack 6 only opposite to the first connection 3 .
  • the space utilization of the housing 2 can thus be increased, since free space for the second conductor 9 only has to be reserved in the area of the first connection 3 .
  • FIG. 8 shows a second embodiment variant of the contacting of the second arrester 9 with the first connection 3. Reference is made to the statements relating to FIG.
  • the second conductors 9 of both partial stacks 4, 5 are connected to one another and contact a guide element 26.
  • the second conductors 9 extend out of the stack over a larger area of the second side surface 11 of the stack 6 and are connected via a guide element 26 connected to the first terminal 3.
  • the free space for the second arresters 9 in the housing 2 is thus also to be provided outside of the first connection 3, so that the distance 28 between the stack 6 and the first connection 3 is larger.
  • FIG. 9 shows the battery cell 1 according to FIGS. 4 to 7 in a section IX-IX according to FIG. 6. Reference is made to the statements relating to FIGS.
  • a distance 28 between the stack 6 and the housing 2 can be kept very small.
  • FIG. 10 shows the battery cell 1 according to FIGS. 4 to 8 in a section X-X according to FIG. 6. Reference is made to the statements relating to FIGS.
  • the first conductors 8 of each partial stack 4, 5 are connected to one another and extend towards the inner surface 15 of the first housing side 12.
  • the first conductors 8 of the first partial stack 4 and the first conductors 8 of the second partial stack 5 make contact with the inner surface in different areas 15 of the first housing side 12.
  • the inner surface 15 of the first housing side 12 is delimited by the other housing sides 13, 14 of the housing 2 and the partial housing 22, respectively.
  • FIG. 11 shows the battery cell 1 according to FIGS. 4 to 8 in a section XI-XI according to FIG. 6. Reference is made to the statements relating to FIGS.
  • the first arresters 8 extend out of the stack 6 . These first conductors 6 are divided into sections, so that it is possible to fix the partial stacks 4 , 5 to this first side surface 10 using fixing straps 27 . With the connection of the first arresters 8 to the first housing side 12, an improved heat dissipation path can be provided along the electrically and thermally well-suffering direction of the stack 6 (along the surfaces of the electrodes or transversely to the stack direction), directly to the first housing side 12, with the first housing side 12 is arranged on a temperature control device 19 (see FIG. 6).
  • Temperature control device Second connection Assembly Partial housing Burst protection Filling opening Shell Guide element Fixing strap Distance Insulation

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

L'invention concerne un élément de batterie (1) comprenant au moins un boîtier (2) indéformable comportant au moins premier raccordement (3) électrique isolé électriquement par rapport au boîtier (2) et un empilement (6) disposé dans le logement (2) qui est constitué d'au moins deux empilements partiels (4, 5), chaque empilement partiel (4, 5) comprenant respectivement une pluralité de couches (7) au moins empilées les unes sur les autres, comprenant au moins une anode et au moins une cathode en tant qu'électrodes et un séparateur qui est disposé entre les différentes électrodes ; de premières électrodes comportant de premiers limiteurs (8) et de deuxièmes électrodes comportant de deuxièmes limiteurs (9) s'étendant hors de l'empilement (6) ; les premiers limiteurs (8) des empilements partiels (4, 5) étant agencés sur une première surface latérale (10) commune de l'empilement (6) et les deuxièmes limiteurs (9) des empilements partiels (4, 5) étant disposés sur une deuxième surface latérale (11) commune de l'empilement (6), les premiers limiteurs (8) étant reliés de manière électroconductrice à un premier côté de boîtier (12) du boîtier (2) et les deuxièmes limiteurs (9) de l'empilement (6) étant reliés de manière électroconductrice au(x) premier(s) raccordement(s) (3). L'invention concerne en outre des ensembles batterie (16) appropriés et des procédés pour produire un élément de batterie (1).
PCT/EP2022/074241 2021-09-01 2022-08-31 Élément de batterie, ensemble batterie et procédé pour produire un élément de batterie WO2023031297A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202280059448.3A CN117916944A (zh) 2021-09-01 2022-08-31 电池单格、电池组件以及用于制造电池单格的方法
EP22773139.5A EP4396897A1 (fr) 2021-09-01 2022-08-31 Élément de batterie, ensemble batterie et procédé pour produire un élément de batterie

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021122659.7A DE102021122659A1 (de) 2021-09-01 2021-09-01 Batteriezelle, Batterieanordnung und Verfahren zur Herstellung einer Batteriezelle
DE102021122659.7 2021-09-01

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WO2023031297A1 true WO2023031297A1 (fr) 2023-03-09

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EP (1) EP4396897A1 (fr)
CN (1) CN117916944A (fr)
DE (1) DE102021122659A1 (fr)
WO (1) WO2023031297A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013021411A1 (de) * 2013-12-18 2015-06-18 Daimler Ag Batterie mit Wärmeabfuhr
EP2933856A1 (fr) * 2014-04-17 2015-10-21 Samsung SDI Co., Ltd. Batterie rechargeable ayant un élément de distribution de courant
WO2019081408A1 (fr) * 2017-10-27 2019-05-02 Robert Bosch Gmbh Cellule de batterie et son procédé de fabrication
DE102018203052A1 (de) 2018-03-01 2019-09-05 Gs Yuasa International Ltd. Batterie und Verfahren zum Herstellen einer Batterie
WO2019213717A1 (fr) 2018-05-11 2019-11-14 Cape Bouvard Technologies Pty Ltd Batterie structurale
US20200144676A1 (en) 2018-11-05 2020-05-07 Tesla, Inc. Cell with a tabless electrode
KR102242274B1 (ko) 2020-07-27 2021-04-20 주식회사 유로셀 커런트 컬렉터 연결구조를 갖는 각형 셀 및 그 제조방법
DE102021112444A1 (de) 2020-12-02 2022-06-02 Volkswagen Aktiengesellschaft Batteriezelle

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013021411A1 (de) * 2013-12-18 2015-06-18 Daimler Ag Batterie mit Wärmeabfuhr
EP2933856A1 (fr) * 2014-04-17 2015-10-21 Samsung SDI Co., Ltd. Batterie rechargeable ayant un élément de distribution de courant
WO2019081408A1 (fr) * 2017-10-27 2019-05-02 Robert Bosch Gmbh Cellule de batterie et son procédé de fabrication
DE102018203052A1 (de) 2018-03-01 2019-09-05 Gs Yuasa International Ltd. Batterie und Verfahren zum Herstellen einer Batterie
WO2019213717A1 (fr) 2018-05-11 2019-11-14 Cape Bouvard Technologies Pty Ltd Batterie structurale
US20200144676A1 (en) 2018-11-05 2020-05-07 Tesla, Inc. Cell with a tabless electrode
KR102242274B1 (ko) 2020-07-27 2021-04-20 주식회사 유로셀 커런트 컬렉터 연결구조를 갖는 각형 셀 및 그 제조방법
DE102021112444A1 (de) 2020-12-02 2022-06-02 Volkswagen Aktiengesellschaft Batteriezelle

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CN117916944A (zh) 2024-04-19
EP4396897A1 (fr) 2024-07-10
DE102021122659A1 (de) 2023-03-02

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