WO2023082152A1 - Cellule de batterie, batterie, dispositif électrique, et procédé et appareil de préparation de cellule de batterie - Google Patents

Cellule de batterie, batterie, dispositif électrique, et procédé et appareil de préparation de cellule de batterie Download PDF

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Publication number
WO2023082152A1
WO2023082152A1 PCT/CN2021/130145 CN2021130145W WO2023082152A1 WO 2023082152 A1 WO2023082152 A1 WO 2023082152A1 CN 2021130145 W CN2021130145 W CN 2021130145W WO 2023082152 A1 WO2023082152 A1 WO 2023082152A1
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WO
WIPO (PCT)
Prior art keywords
facet
battery cell
transition
casing
housing
Prior art date
Application number
PCT/CN2021/130145
Other languages
English (en)
Chinese (zh)
Inventor
林蹬华
唐代春
陈新祥
郭志君
郑于炼
王鹏
金海族
Original Assignee
宁德时代新能源科技股份有限公司
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.)
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Publication date
Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to PCT/CN2021/130145 priority Critical patent/WO2023082152A1/fr
Priority to CN202180073998.6A priority patent/CN116458004A/zh
Priority to CN202222855753.3U priority patent/CN219017776U/zh
Publication of WO2023082152A1 publication Critical patent/WO2023082152A1/fr

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    • 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
    • H01M10/04—Construction or manufacture in general
    • 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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • 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
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular 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
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/471—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof
    • H01M50/474—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof characterised by their position inside 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
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/471—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof
    • H01M50/48—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof characterised by the material
    • 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
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • 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
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • 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
    • 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
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present application relates to the field of battery technology, in particular to a battery cell, a battery, an electrical device, and a method and device for preparing a battery cell.
  • Energy saving and emission reduction is the key to the sustainable development of the automobile industry.
  • electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy saving and environmental protection.
  • battery technology is an important factor related to its development.
  • the battery In order to adapt to people's fast-paced travel, the battery needs to meet the needs of fast charging during use. For this reason, the capacity of the battery cell needs to be increased, which may change the size of the battery cell, thus occupying more storage space. . Therefore, how to improve the space utilization rate of the battery cells has become a problem to be solved.
  • Embodiments of the present application provide a battery cell, a battery, an electrical device, and a method and device for preparing the battery cell, which can improve the space utilization rate of the battery cell.
  • a battery cell including: an electrode terminal; a case, the case includes a case and a cover plate, and the case includes a pair of first side walls oppositely arranged along a first direction, along a second A pair of second side walls and a bottom wall disposed opposite to each other in two directions, the cover plate covers the housing, the cover plate and the bottom wall are disposed opposite to each other along a third direction, the first direction, the The second direction and the third direction are perpendicular to each other, the area of the bottom wall is larger than the area of the first side wall, and the area of the bottom wall is larger than the area of the second side wall; wherein, the first The side wall includes a first split surface, a second split surface and a transition surface, the first split surface and the second split surface are connected by the transition surface, and the first split surface and the second split surface are perpendicular to The first direction, and the first facet is closer to the middle position of the housing in the first direction than the second facet, the first facet and
  • the edge region of the end portion of the battery cell casing in the first direction is indented to form an accommodating space outside the casing, and the electrode terminals are arranged on the first sub-plane or transition forming the accommodating space. surface, and extend from the inside of the casing to the outside of the casing and placed in the accommodating space, so that the electrode terminals can be hidden without taking up additional space, which can improve the space utilization of the battery cell and reduce the impact on the battery.
  • the effect of energy density Furthermore, hiding the electrode terminals in the accommodation space formed by the surface with the smallest area can further reduce the impact on the energy density of the battery.
  • the battery cell further includes: an electrode assembly disposed in the casing, the electrode assembly includes a tab protruding along the first direction, and the tab is disposed on the In the space between the second subsurface and the first subsurface in the housing, the tab is electrically connected to the electrode terminal.
  • the tabs of the electrode assembly are arranged in the space between the first subsurface and the second subsurface inside the casing, and the electrode terminals are arranged outside the casing by the first subsurface and the second subsurface.
  • the electrode terminal and the tab share the space in the length direction of the electrode assembly, thereby improving the space utilization rate of the battery cell.
  • the electrode terminal is disposed on the transition surface; the electrode terminal includes a first part and a second part; the electrode terminal extends along the second direction, and the first part and the The tabs are connected; the second part protrudes through the transition surface to an accommodating space outside the housing, and the accommodating space is composed of the first subsurface, the second subsurface and the The transition surface is formed.
  • both the first part and the second part of the electrode terminal are sheet-shaped.
  • the first part of the electrode terminal connected to the tab and the second part connected to the busbar are set in a sheet shape, so that the tab and the busbar can be directly connected to the electrode terminal without an adapter part, Therefore, parts can be simplified, and the problems of increased resistance and unstable electrical connection caused by internal electrical connection transfer are reduced. In addition, the space occupied by the transition parts is reduced, which is beneficial to make the tabs and electrode terminals larger, so that the overcurrent capability is stronger.
  • the battery cell further includes: an adapter part, disposed in the casing, for electrically connecting the tab and the electrode terminal.
  • the electrical connection between the tabs and the electrode terminals can be realized by providing the transition parts, so as to realize the power supply function of the battery cells.
  • the battery cell further includes: an insulating support, disposed in the casing and between the electrode assembly and the casing, the insulating support is used to support the tab and the transition parts.
  • the electrode assembly and the adapter part can be fixed in the casing, so that the shaking of the tab and the adapter part can be reduced, and the pole ear can be prevented from being cut or the adapter part can be damaged. Loose, making the structure of the battery cell more stable.
  • the insulating bracket includes a receiving part and an extension part, and the receiving part is arranged in a space between the second sub-plane and the first sub-plane in the housing , the extension part is disposed between the electrode assembly and the first facet, the transition part includes a first connection part and a second connection part, and the first connection part extends along the first direction And the accommodating portion is connected to the tab, and the second connecting portion is connected to the first connecting portion and connected to the electrode terminal.
  • the tab when the tab is located in the receiving portion of the insulating bracket, the tab can share space with the insulating bracket without taking up extra space, so that the structure of the battery cell is more compact, thereby increasing the space of the battery cell. utilization rate. And by bending the adapter part into a first connection part and a second connection part, the first connection part is connected to the tab, and the second connection part is connected to the electrode terminal, so that the electrical connection between the tab and the electrode terminal can be realized.
  • the electrode terminal is disposed on the first subsurface, and the second connection part is connected to the first connection part and covers at least part of the first subsurface, so that Connected to the electrode terminal on the first part surface; or the electrode terminal is arranged on the transition surface, the second connection part is connected to the first connection part and covers at least the transition surface part to connect with the electrode terminal on the transition surface.
  • the second connecting portion covers at least part of the transition surface or the first sub-surface, and can be connected to the electrode terminal on the transition surface or the first sub-surface, and if the electrode terminal is arranged on the transition surface, the transfer The component does not occupy the space in the length direction of the electrode assembly, and can avoid the tabs of the electrode assembly, which is beneficial to reduce damage to the tabs, thereby prolonging the life of the battery cell.
  • the battery cell further includes: a first insulator, disposed in the casing and between the second connecting portion and the first split surface, to isolate the The casing and the transition part; the second insulating member, disposed outside the casing, is used for isolating the casing and the riveting parts of the electrode terminals.
  • the casing is isolated from the transition component by the first insulating member, and the casing is separated from the riveting member by the second insulating member, which can improve the safety of the battery cell.
  • the first insulating member is the extension of the insulating support.
  • the integral molding of the first insulating member and the insulating support can not only improve the safety of the battery, but also improve the structural stability of the battery cell.
  • the battery cell further includes: a first insulating member, disposed in the casing and at least between the second connecting portion and the transition surface, so as to isolate the casing and the transition part; a second insulating member, disposed outside the outer casing, for isolating the outer casing and the riveting parts of the electrode terminals.
  • the casing is isolated from the transition component by the first insulating member, and the casing is separated from the riveting member by the second insulating member, which can improve the safety of the battery cell.
  • the first insulating member includes a first insulating part and a second insulating part, the first insulating part is arranged between the first connecting part and the housing, and the The second insulating part is connected to the first insulating part and is arranged between the second connecting part and the transition surface, so as to isolate the shell from the transition part.
  • the transition surface is a plane.
  • the transition surface is a plane, that is, the accommodating space outside the casing penetrates the casing in the third direction, which is conducive to hiding the confluence components for electrical connection between the battery cells, that is, the confluence components do not need to occupy additional space , which can increase the energy density of the battery.
  • the transition surface is perpendicular to the second direction.
  • the transition surface is an L-shaped folded surface.
  • the transition surface is an L-shaped folded surface, that is, the accommodation space outside the casing does not penetrate the casing in the third direction, which is beneficial to make the area of the tab larger, thereby achieving a stronger flow capacity.
  • the transition surface includes a first transition section perpendicular to the second direction and a second transition section perpendicular to the third direction.
  • the electrode terminals are arranged on the first transitional surface.
  • the tab and the first connecting portion extend along the second direction and cover at least a part of the second transition facet.
  • the tabs and the second connecting portion in the battery cell can extend along the second direction, that is, the area of the tab can be made larger, so that the battery cell has a stronger flow-through capacity .
  • the electrode terminal is arranged on the first split surface, and the length of the first connecting portion along the second direction is greater than that of the second connecting portion along the second direction. length.
  • the first subsurface or the transition surface is provided with a first opening
  • the electrode terminal is arranged on the first subsurface or the transition surface through the first opening.
  • the battery cell further includes: a sealing ring for sealing the gap between the electrode terminal and the first opening.
  • the arrangement of the sealing ring can prevent the leakage of the electrolyte in the casing, thereby improving the safety of the battery cells.
  • the inner side of the sealing ring protrudes from the outer side of the sealing ring along the axial direction, and the inner side of the sealing ring is embedded into the first opening.
  • the sealing performance of the sealing ring can be further improved by arranging that the inner side of the sealing ring protrudes from the outer side of the sealing ring in the axial direction, and inserting the inner side of the sealing ring into the first opening.
  • the two first facets of the pair of first side walls are arranged symmetrically along the diagonal of the housing, or along the centerline of the housing in the first direction Symmetrical setting.
  • a battery including a plurality of battery cells and a current-flow component, each of the plurality of battery cells includes: an electrode terminal; a casing, and the casing includes a casing and a cover plate , the housing includes a pair of first side walls oppositely arranged along a first direction, a pair of second side walls and a bottom wall oppositely arranged along a second direction, the cover plate covers the housing, the The cover plate and the bottom wall are arranged opposite to each other along a third direction, the first direction, the second direction and the third direction are perpendicular to each other, the area of the bottom wall is larger than the area of the first side wall, The area of the bottom wall is greater than the area of the second side wall, the first side wall includes a first split surface, a second split surface and a transition surface, and the first split surface and the second split surface are composed of The transition plane is connected, the first split plane and the second split plane are both perpendicular to the first direction, and the first split plane is closer
  • the transition surface is a plane
  • the connection surfaces between the electrode terminals of the two adjacent battery cells and the busbar are located on a plane
  • the busbar is a sheet structure
  • the transition surface is a plane
  • the electrode terminals of the two adjacent battery cells are parallel to the connecting surface of the current flow component
  • the current flow component is a U-shaped structure
  • the transition surface is an L-shaped folded surface
  • the confluence part includes two connecting parts and a spanning part, the two connecting parts are connected to the spanning part, and the two connecting parts The portion connects the electrode terminals of the two adjacent battery cells, and the spanning portion straddles the second facet of one of the two adjacent battery cells.
  • an electric device including: the battery cell in any possible implementation manner of the third aspect and the third aspect, where the battery cell is used to provide electric energy.
  • a method for preparing a battery cell comprising: providing electrode terminals; providing a casing, the casing includes a casing and a cover plate, and the casing includes a pair of first A side wall, a pair of second side walls and a bottom wall that are oppositely arranged along the second direction, the cover plate covers the housing, the cover plate and the bottom wall are oppositely arranged along the third direction, the first One direction, the second direction and the third direction are perpendicular to each other, the area of the bottom wall is larger than the area of the first side wall, and the area of the bottom wall is larger than the area of the second side wall; wherein , the first side wall includes a first facet, a second facet and a transition face, the first facet and the second facet are connected by the transition face, the first facet and the second facet The facets are all perpendicular to the first direction, and the first facet is closer to the middle position of the housing in the first direction than the second facet, and
  • the sum of the areas of the second facets is smaller than the area of the second side wall, and the sum of the areas of the first facet and the second facet is smaller than the area of the bottom wall; the electrode terminals are arranged at The first facet or the transition face.
  • a device for preparing a battery cell comprising: providing a module for: providing electrode terminals; providing a casing, the casing includes a casing and a cover plate, and the casing includes opposite electrodes along a first direction.
  • the first side wall includes a first facet, a second facet and a transition face, the first facet and the second facet are connected by the transition face, and the first facet is connected by the transition face
  • a facet and a second facet are both perpendicular to the first direction, and the first facet is closer to the middle position of the housing in the first direction than the second facet, and the first facet is closer to the middle position of the housing in the first direction than the second facet.
  • the sum of the areas of a facet and the second facet is smaller than the area of the second side wall, and the sum of the areas of the first facet and the second facet is smaller than the area of the bottom wall;
  • the electrode terminals are arranged on the first partial surface or the transition surface.
  • Fig. 1 is a schematic structural diagram of a vehicle disclosed in an embodiment of the present application.
  • Fig. 2 is a schematic structural diagram of a battery disclosed in an embodiment of the present application.
  • FIG. 3 is a schematic structural view of a battery cell disclosed in an embodiment of the present application.
  • FIG. 4 is a schematic structural view of a battery cell disclosed in an embodiment of the present application.
  • FIG. 5 is a schematic structural view of a battery cell disclosed in an embodiment of the present application.
  • FIG. 6 is a schematic structural view of a battery cell disclosed in an embodiment of the present application.
  • FIG. 7 is a schematic structural view of a battery cell disclosed in an embodiment of the present application.
  • FIG. 8 is a schematic exploded view of a battery cell disclosed in an embodiment of the present application.
  • FIG. 9 is a schematic exploded view of a battery cell disclosed in an embodiment of the present application.
  • Fig. 10 is a schematic exploded view of a battery cell disclosed in an embodiment of the present application.
  • Fig. 11 is a schematic exploded view of a battery cell disclosed in an embodiment of the present application.
  • Fig. 12 is a schematic structural diagram of an adapter component disclosed in an embodiment of the present application.
  • Fig. 13 is a schematic structural diagram of an adapter component disclosed in an embodiment of the present application.
  • Fig. 14 is a schematic structural diagram of an insulating support disclosed in an embodiment of the present application.
  • Fig. 15 is a schematic structural view of an electrode assembly disclosed in an embodiment of the present application.
  • FIG. 16 is a schematic exploded view of a battery cell disclosed in an embodiment of the present application.
  • FIG. 17 is a schematic structural view of an electrode terminal disclosed in an embodiment of the present application.
  • Fig. 18 is a schematic structural view of a battery disclosed in an embodiment of the present application.
  • Fig. 19 is a schematic structural view of a battery disclosed in an embodiment of the present application.
  • Fig. 20 is a schematic structural diagram of a battery disclosed in an embodiment of the present application.
  • Fig. 21 is a schematic block diagram of a method for preparing a battery cell according to an embodiment of the present application.
  • Fig. 22 is a schematic block diagram of a device for preparing a battery cell according to an embodiment of the present application.
  • connection should be understood in a broad sense, for example, it can be fixed connection, detachable connection, or integral connection; it can be directly connected or indirectly connected through an intermediary.
  • connection should be understood in a broad sense, for example, it can be fixed connection, detachable connection, or integral connection; it can be directly connected or indirectly connected through an intermediary.
  • connection should be understood in a broad sense, for example, it can be fixed connection, detachable connection, or integral connection; it can be directly connected or indirectly connected through an intermediary.
  • connection should be fixed connection, detachable connection, or integral connection; it can be directly connected or indirectly connected through an intermediary.
  • Multiple appearing in this application refers to more than two (including two), similarly, “multiple groups” refers to more than two groups (including two groups), and “multi-piece” refers to more than two (Includes two pieces).
  • the battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, which are not limited in the embodiments of the present application.
  • the battery cell can be in the form of a cylinder, a flat body, a cuboid or other shapes, which is not limited in this embodiment of the present application.
  • Battery cells are generally divided into three types according to packaging methods: cylindrical battery cells, square square battery cells and pouch battery cells, which are not limited in this embodiment of the present application.
  • the battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.
  • the battery mentioned in this application may include a battery module or a battery pack, and the like.
  • Batteries generally include a case for enclosing one or more battery cells. The box can prevent liquid or other foreign objects from affecting the charging or discharging of the battery cells.
  • the battery cell includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive electrode sheet, a negative electrode sheet, and a separator.
  • a battery cell works primarily by moving metal ions between the positive and negative plates.
  • the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer.
  • the positive electrode active material layer is coated on the surface of the positive electrode current collector.
  • the current collector not coated with the positive electrode active material layer protrudes from the current collector coated with the positive electrode active material layer.
  • the current collector coated with the positive electrode active material layer serves as the positive electrode tab.
  • the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate.
  • the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer.
  • the negative electrode active material layer is coated on the surface of the negative electrode current collector.
  • the current collector without the negative electrode active material layer protrudes from the current collector coated with the negative electrode active material layer.
  • the current collector coated with the negative electrode active material layer serves as the negative electrode tab.
  • the material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon.
  • the number of positive pole tabs is multiple and stacked together, and the number of negative pole tabs is multiple and stacked together.
  • the material of the diaphragm can be PP or PE, etc.
  • the electrode assembly may be a wound structure or a laminated structure, which is not limited in the embodiment of the present application.
  • a signal transmission component may also be included.
  • the signal transmission component can be used to transmit signals such as the voltage and/or temperature of the battery cells.
  • the signal transmission component may include a confluence part, which is used to realize electrical connection among a plurality of battery cells, such as parallel connection, series connection or hybrid connection.
  • the bus component can realize the electrical connection between the battery cells by connecting the electrode terminals of the battery cells.
  • the bus member may be fixed to the electrode terminal of the battery cell by welding.
  • the bussing part transmits the voltage of the battery cells, and a higher voltage will be obtained after multiple battery cells are connected in series.
  • the electrical connection formed by the bussing part can also be called a "high voltage connection".
  • the signal transmission assembly may also include a sensor device for sensing the state of the battery cell, for example, the sensor device may be used to measure and transmit sensor signals such as temperature and state of charge of the battery cell.
  • the electrical connection member in the battery may include a current flow component and/or a sensor device.
  • Bus components and sensing devices can be encapsulated in an insulating layer to form a signal transmission assembly.
  • the signal transmission component can be used to transmit the voltage of the battery cell and/or the sensing signal.
  • the signal transmission component does not have an insulating layer at the connection with the electrode terminal of the battery cell, that is, the insulating layer has an opening here, so as to be connected with the electrode terminal of the battery cell.
  • batteries such as mobile phones, portable devices, notebook computers, battery cars, electric toys, electric tools, electric vehicles, ships and spacecraft, etc.
  • spacecraft include Airplanes, rockets, space shuttles and spaceships, etc.
  • FIG. 1 it is a schematic structural diagram of a vehicle 1 according to an embodiment of the present application.
  • the vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or Extended range cars, etc.
  • a motor 80 , a controller 60 and a battery 100 can be arranged inside the vehicle 1 , and the controller 60 is used to control the battery 100 to supply power to the motor 80 .
  • the battery 100 may be provided at the bottom or the front or the rear of the vehicle 1 .
  • the battery 100 can be used for power supply of the vehicle 1 , for example, the battery 100 can be used as an operating power source of the vehicle 1 and used for a circuit system of the vehicle 1 , for example, for starting, navigating, and operating power requirements of the vehicle 1 .
  • the battery 100 can not only be used as an operating power source for the vehicle 1 , but can also be used as a driving power source for the vehicle 1 , replacing or partially replacing fuel oil or natural gas to provide driving power for the vehicle 1 .
  • the battery may include multiple battery cells, wherein the multiple battery cells may be connected in series, in parallel or in parallel, and the hybrid connection refers to a mixture of series and parallel connections. Batteries can also be called battery packs.
  • a plurality of battery cells can be connected in series, parallel or mixed to form a battery module, and then a plurality of battery modules can be connected in series, parallel or mixed to form a battery. That is to say, multiple battery cells can directly form a battery, or form a battery module first, and then form a battery from the battery module.
  • the battery 100 may include a plurality of battery cells 20 .
  • the battery 100 may also include a box body (or called a cover body), and the inside of the box body is a hollow structure, and a plurality of battery cells 20 are accommodated in the box body.
  • the box body may include two parts, referred to here as a first part 111 and a second part 112 respectively, and the first part 111 and the second part 112 are fastened together.
  • the shapes of the first part 111 and the second part 112 can be determined according to the combined shape of a plurality of battery cells 20 , and each of the first part 111 and the second part 112 can have an opening.
  • both the first part 111 and the second part 112 can be hollow cuboids and each has only one face as an open face, the opening of the first part 111 and the opening of the second part 112 are arranged oppositely, and the first part 111 and the second part 112 are interlocked combined to form a box with a closed chamber.
  • a plurality of battery cells 20 are combined in parallel, in series or in parallel and placed in the box formed by fastening the first part 111 and the second part 112 .
  • the battery 100 may also include other structures, which will not be repeated here.
  • the battery 100 may also include a confluence part, which is used to realize the electrical connection between a plurality of battery cells 20 , such as parallel connection, series connection or mixed connection.
  • the current-combining component can realize the electrical connection between the battery cells 20 by connecting the electrode terminals of the battery cells 20 .
  • the bus member may be fixed to the electrode terminal of the battery cell 20 by welding. The electric energy of the plurality of battery cells 20 can be further drawn out through the box through the conductive mechanism.
  • the conduction means can also belong to the current-collecting part.
  • the number of battery cells 20 can be set to any value. Multiple battery cells 20 can be connected in series, in parallel or in parallel to achieve greater capacity or power. Since the number of battery cells 20 included in each battery 100 may be large, for the convenience of installation, the battery cells 20 may be arranged in groups, and each group of battery cells 20 constitutes a battery module. The number of battery cells 20 included in the battery module is not limited and can be set according to requirements.
  • the battery cell 20 includes one or more electrode assemblies 22 , a casing 211 and a cover plate 212 .
  • the walls of the casing 211 and the cover plate 212 are both referred to as walls of the battery cell 20 .
  • the housing 211 depends on the combined shape of one or more electrode assemblies 22.
  • the housing 211 can be a hollow cuboid or cube or cylinder, and one of the surfaces of the housing 211 has an opening so that one or more electrodes Assembly 22 may be placed within housing 211 .
  • the housing 211 when the housing 211 is a hollow cuboid or cube, one of the planes of the housing 211 is an open surface, that is, the plane does not have a wall so that the inside and outside of the housing 211 communicate.
  • the casing 211 can be a hollow cylinder, the end surface of the casing 211 is an open surface, that is, the end surface does not have a wall so that the inside and outside of the casing 211 communicate.
  • the cover plate 212 covers the opening and is connected with the casing 211 to form a closed cavity for placing the electrode assembly 22 .
  • the casing 211 is filled with electrolyte, such as electrolytic solution.
  • the battery cell 20 may further include two electrode terminals 214 , and the two electrode terminals 214 may be disposed on the cover plate 212 .
  • the cover plate 212 is usually in the shape of a flat plate, and two electrode terminals 214 are fixed on the flat plate surface of the cover plate 212, and the two electrode terminals 214 are positive electrode terminals 214a and negative electrode terminals 214b respectively.
  • Each electrode terminal 214 is respectively provided with a connecting member 23 , or also referred to as a current collecting member 23 , which is located between the cover plate 212 and the electrode assembly 22 for electrically connecting the electrode assembly 22 and the electrode terminal 214 .
  • each electrode assembly 22 has a first tab 221a and a second tab 222a.
  • the polarities of the first tab 221a and the second tab 222a are opposite.
  • the first tab 221a is a positive tab
  • the second tab 222a is a negative tab.
  • the first tabs 221a of one or more electrode assemblies 22 are connected to one electrode terminal through one connection member 23
  • the second tabs 222a of one or more electrode assemblies 22 are connected to another electrode terminal through another connection member 23 .
  • the positive electrode terminal 214 a is connected to the positive electrode tab through one connection member 23
  • the negative electrode terminal 214 b is connected to the negative electrode tab through the other connection member 23 .
  • the electrode assembly 22 can be arranged as a single one or in multiples. As shown in FIG. 3 , four independent electrode assemblies 22 are arranged in the battery cell 20 .
  • a pressure relief mechanism 213 may also be provided on one wall of the battery cell 20 , the first wall 21 a shown in FIG. 3 .
  • the first wall 21 a is separated from the casing 211 in FIG. 3 , but this does not limit the bottom side of the casing 211 to have an opening.
  • the pressure relief mechanism 213 is activated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 20 reaches a threshold.
  • the wall on which the electrode terminal 214 is disposed is disposed opposite to the first wall 21a.
  • the first wall 21 a may be the bottom wall of the battery cell 20
  • the wall on which the electrode terminals 214 are disposed may be the top wall of the battery cell 20 , that is, the cover plate 212 .
  • the embodiment of the present application provides a technical solution.
  • the casing of the battery cell is indented in the edge area of the end to form an accommodating space outside the casing, and the electrode terminals are arranged in the accommodating space. Therefore, the electrode terminals can be hidden without occupying additional space, thereby improving the space utilization rate of the battery cell and reducing the impact on the energy density of the battery.
  • FIG. 4 shows a schematic structural diagram of a battery cell 30 provided by an embodiment of the present application.
  • FIG. 5 shows a schematic structural diagram of another battery cell 30 provided by the embodiment of the present application.
  • the battery cell 30 includes: an electrode terminal 32 and a casing 31
  • the casing 31 includes a casing 311 and a cover plate 312 .
  • One of the surfaces of the casing 311 has an opening, and the cover plate 312 can cover the opening and be connected with the casing 311 to form a closed cavity.
  • Each surface of the casing 31 may form the wall of the battery cell 30 , that is, the surface of the casing 31 mentioned in the embodiment of the present application is actually the wall of the battery cell 30 with a certain thickness.
  • the closed cavity formed by the shell 311 and the cover plate 312 can be used to place the electrode assembly, and the shape of the shell 31 can be determined according to the shape of the electrode assembly placed inside it, for example, the shell 31 Can be cuboid, cube or cylinder.
  • the description herein is made by taking the case 31 as a cuboid as an example, those skilled in the art understand that this embodiment of the present application does not constitute a limitation.
  • the housing 311 includes a pair of first sidewalls 313 oppositely disposed along the first direction X, a pair of second sidewalls 314 and a bottom wall 315 oppositely disposed along the second direction Y.
  • the cover plate 312 covers the housing 311 , and the cover plate 312 and the bottom wall 315 are disposed opposite to each other along a third direction Z, wherein the first direction X, the second direction Y and the third direction Z are perpendicular to each other.
  • the area of the bottom wall 315 is larger than that of the first side wall 313 , and the area of the bottom wall 315 is larger than that of the second side wall 314 . That is to say, the area of the cover plate 312 is greater than the area of the first side wall 313 , and the area of the cover plate 312 is greater than the area of the second side wall 314 .
  • the first side wall 313 may include a first subsurface 313a, a second subsurface 313b and a transition surface 313c.
  • the first split surface 313a and the second split surface 313b are connected by a transition surface 313c, and both the first split surface 313a and the second split surface 313b are perpendicular to the first direction X, and the first split surface 313a is compared with the second split surface
  • the surface 313b is closer to the middle position of the housing 31 in the first direction X, the sum of the areas of the first subsurface 313a and the second subsurface 313b is smaller than the area of the second side wall 314, the first subsurface 313a and the second subsurface 313a
  • the sum of the areas of the bisection surfaces 313b is smaller than the area of the bottom wall 315 .
  • the electrode terminal 32 is disposed on the first sub-surface 313a. Specifically, the electrode terminal 32 extends along the first direction X from the inside of the casing 31 to the accommodation space 316 outside the casing 31, and the accommodation space 316 is composed of the first split surface 313a, the second split surface 313b and the transition surface 313c Forming.
  • the electrode terminal 32 is disposed on the transition surface 313c. Specifically, the electrode terminal 32 extends along the second direction Y from the inside of the casing 31 to the accommodation space 316 outside the casing 31, and the accommodation space 316 is composed of the first split surface 313a, the second split surface 313b and the transition surface 313c Forming.
  • the outer casing 31 of the battery cell 30 is indented in the edge region of the end in the first direction X to form an accommodating space 316 outside the outer casing 31, and the electrode terminals 32 are arranged at the first part forming the accommodating space 316.
  • surface 313a or transition surface 313c extends from the inside of the casing 31 to the outside of the casing 31 and is placed in the accommodating space 316, so that the electrode terminals 32 can be hidden without occupying additional space, and the battery cell can be improved.
  • 30 space utilization reducing the impact on the energy density of the battery.
  • hiding the electrode terminals 32 in the accommodating space 316 formed by the walls with the smallest area can further reduce the impact on the energy density of the battery.
  • the transition surface 313c may be a plane. In other words, the accommodating space 316 passes through the housing 31 in the third direction Z.
  • the transition surface 313c may be perpendicular to the second direction Y.
  • the transition surface 313c may not be perpendicular to the second direction Y, that is, the transition surface 313c connecting the first sub-surface 313a and the second sub-surface 313b may be an inclined plane.
  • the embodiment of the present application does not specifically limit whether the transition surface 313c is perpendicular to the second direction Y, as long as the first sub-surface 313a, the second sub-surface 313b and the transition surface 313c can form the accommodating space 316 .
  • FIG. 6 shows a schematic structural diagram of another battery cell 30 provided by the embodiment of the present application.
  • FIG. 7 shows a schematic structural diagram of another battery cell 30 provided by the embodiment of the present application.
  • the transition surface 313 c is an L-shaped folded surface, that is, the accommodating space 316 does not pass through the housing 31 in the third direction Z.
  • the transition surface 313c includes a first transition subsurface 313c-1 perpendicular to the second direction Y and a second transition subsurface 313c-2 perpendicular to the third direction Z.
  • the first transitional facet 313c-1 and the second transitional facet 313c-2 may not be perpendicular to the second direction Y and the third direction Z respectively, that is, as long as the first facet 313a
  • the accommodating space 316 may be formed by the second subsurface 313b, the first transition subsurface 313c-1 and the second transition subsurface 313c-2.
  • the electrode terminal 32 is arranged on the first partial surface 313 a.
  • the electrode terminal 32 is arranged on the first transitional partial surface 313 c - 1 .
  • the electrode terminal 32 may also be disposed on the second transitional facet 313c-2, which is not limited in the embodiment of the present application.
  • FIG. 8 to 11 show exploded schematic diagrams of the battery cell 30 provided by the embodiment of the present application.
  • 8 is a schematic diagram of explosion of the battery cell 30 shown in FIG. 4
  • FIG. 9 is a schematic diagram of explosion of the battery cell 30 shown in FIG. 5
  • FIG. 10 is a schematic diagram of explosion of the battery cell 30 shown in FIG. 6
  • FIG. 11 is a schematic exploded view of the battery cell 30 shown in FIG. 7 .
  • the battery cell 30 further includes: an electrode assembly 33 disposed in the housing 31 , the electrode assembly 33 includes a tab 331 protruding along the first direction X, the tab 331 is disposed in the space between the second subsurface 313 b and the first subsurface 313 a in the casing, and the tab 331 is electrically connected to the electrode terminal 32 .
  • the electrode assembly 33 may be composed of a positive pole piece, a negative pole piece and a separator.
  • the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, and the current collector not coated with the positive electrode active material layer protrudes from the collector coated with the positive electrode active material layer. Fluid, the current collector not coated with the positive electrode active material layer is used as the positive electrode tab.
  • the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The current collector without the negative electrode active material layer protrudes from the current collector coated with the negative electrode active material layer.
  • the current collector coated with the negative electrode active material layer serves as the negative electrode tab.
  • the positive tab and the negative tab may protrude along the first direction X, that is, the first direction X may also be the length direction of the electrode assembly 33 .
  • the electrode terminal 32 electrically connected to the positive electrode tab is a positive electrode terminal
  • the electrode terminal 32 electrically connected to the negative electrode tab is a negative electrode terminal.
  • the embodiment of the present application mainly describes the arrangement position of the electrode terminal 32 , therefore, the electrode terminal 32 may be a positive electrode terminal or a negative electrode terminal, which is not limited here.
  • the battery cell 30 further includes: an adapter part 34 disposed in the casing 31 for electrically connecting the tab 331 and the electrode terminal 32 .
  • the adapter component 34 will be described in detail below in conjunction with whether the electrode terminal 32 is disposed on the first sub-surface 313a or the transition surface 313c, and whether the transition surface 313c is a plane or an L-shaped folded surface.
  • the electrode terminal 32 is disposed on the first split surface 313 a and the transition surface 313 c is a plane.
  • the adapter part 34 also includes a first connection part 341 and a second connection part 342 , wherein the first connection part 341 extends along the first direction X and is connected to the tab 331 , the first connection The portion 341 is perpendicular to the second connecting portion 342 which is connected to the first connecting portion 341 and covers at least a part of the first split surface 313a to connect with the electrode terminal 32 on the first split surface 313a.
  • the first connecting portion 341 is parallel to the tab 331, that is, the first connecting portion 341 is perpendicular to the third direction Z, and the first connecting portion 341 and the tab 331 are stacked and connected in a flat plate, and the second connecting portion 342 It is perpendicular to the first direction X and extends along the second direction Y.
  • the length of the first connecting portion 341 along the second direction Y may be smaller than the size of the second connecting portion 342 along the second direction Y.
  • the electrode terminal 32 is disposed on the transition surface 313c and the transition surface 313c is a plane.
  • the adapter component 34 further includes a first connecting portion 341 and a second connecting portion 342 .
  • the first connecting portion 341 extends along the first direction X and is connected to the tab 331
  • the first connecting portion 341 is perpendicular to the second connecting portion 342
  • the second connecting portion 342 is connected to the first connecting portion 341 and covers the transition surface 313c, so as to be connected to the electrode terminal 32 on the transition surface 313c.
  • the first connecting portion 341 is parallel to the tab 331, that is, the first connecting portion 341 is perpendicular to the third direction Z, and the first connecting portion 341 and the tab 331 are stacked and connected in a flat plate, and the second connecting portion 342 It is perpendicular to the second direction Y, extends along the third direction Z and covers at least part of the transition surface 313c.
  • the length of the first connecting portion 341 in the first direction X may be the same as the length of the second connecting portion 342 in the first direction X, and the length of the first connecting portion 341 in the first direction X depends on the The length of X in the first direction.
  • the adapter part 34 in the battery cell 30 shown in FIG. Avoidance is beneficial to reduce damage to the tab 331 , thereby prolonging the life of the battery cell 30 .
  • the electrode terminal 32 is disposed on the first split surface 313 a and the transition surface 313 c is an L-shaped folded surface.
  • the transition plane 313c includes a first transition plane 313c-1 perpendicular to the second direction Y and a second transition plane 313c-2 perpendicular to the third direction Z (not shown).
  • the structure of the transition component 34 in FIG. 10 may be exactly the same as that of the transition component 34 shown in FIG. 12 .
  • the tab 331 and the first connecting portion 341 may extend along the second direction Y and cover at least part of the second transitional split surface 313c-2.
  • the length of the second connection part 342 along the second direction Y may be the same as the length of the first connection part 341 along the second direction Y.
  • the length of the second connection portion 342 along the second direction Y may be smaller than the length of the first connection portion 341 along the second direction. That is, the tab 331 and the first connection portion 341 may extend along the second direction Y and cover at least part of the second transitional split surface 313c-2 to connect the second connection portion 342, and the second connection portion 342 is in the second direction Y
  • the top only covers the first sub-surface 313a, but does not exceed the first sub-surface 313a.
  • the electrode terminal 32 is disposed on the transition surface 313c and the transition surface 313c is an L-shaped folded surface.
  • the transition plane 313c includes a first transition plane 313c-1 perpendicular to the second direction Y and a second transition plane 313c-2 perpendicular to the third direction Z (not shown).
  • the electrode terminal 32 is disposed on the first transitional facet 313c-1.
  • the structure of the transition component 34 in FIG. 11 is exactly the same as that of the transition component 34 shown in FIG. 13 .
  • the tab 331 and the first connecting portion 341 may extend along the second direction Y and cover at least part of the second transitional split surface 313c-2.
  • the transition member 34 may be T-shaped.
  • the transition surface 313c is an L-shaped folded surface.
  • the tab 331 of the electrode assembly 33 may be disposed at a position close to the middle of the electrode assembly 33 along the third direction Z.
  • the tab 331 and the second connection portion 342 in the battery cell 30 in FIG. 10 and FIG. 11 can extend along the second direction Y, that is, the pole
  • the area of the ear 331 can be made larger, so that the battery cell 30 has a stronger flow-through capability.
  • the battery cell 30 may also be of other structures, such as a cube or a cylinder, as long as it can be set in the housing 31
  • the end portion of the tab 331 forms an accommodating space 316 outside the housing 31 , and the electrode terminal 32 is disposed in the accommodating space 316 .
  • the battery cell 30 further includes: an insulating support 35 disposed in the casing 31 and between the electrode assembly 33 and the casing 31 , the insulating bracket 35 The bracket 35 is used to support the tab 321 and the adapter part 34 .
  • the electrode assembly 33 and the adapter part 34 can be fixed in the casing 31 , so that the structure of the battery cell 30 is more stable.
  • the insulating bracket 35 includes an accommodating portion 351 and an extension portion 352, wherein the accommodating portion 351 is disposed in the space between the second subsurface 313b and the first subsurface 313a in the housing 31
  • the extension portion 352 extends along the second direction Y and is disposed between the electrode assembly 33 and the first split surface 313b.
  • the accommodating portion 351 is provided with a groove
  • the groove may include a first wall 353 and a second wall 354 oppositely disposed along the second direction Y, and the first wall 353 and the second wall Compared with the second wall 354, it is closer to the transition surface 313c.
  • the second wall 354 is recessed from the inner top surface to the bottom of the groove along the third direction Z to form a step 3541, and the step surface of the step 3541 is on the same plane as the top surface of the first wall 353, thereby forming
  • the accommodating portion 351 of the insulating bracket 35 is defined.
  • the size of the receiving portion 351 in the second direction Y includes the width from the step surface of the step 3541 to the top surface of the first wall 353
  • the size of the receiving portion 351 in the third direction Z includes the width from the second wall 354 The height difference between the outer top surface of and the step surface of the step 3541.
  • Both ends of the tab 331 or the first connecting portion 341 of the electrode assembly 33 along the second direction Y may rest on the stepped surface and the top surface of the first wall 353 .
  • the first connecting portion 341 may first rest on the stepped surface and the top surface of the first wall 353 , and then the tab 331 is stacked on top of the first connecting portion 341 .
  • the tab 331 may first rest on the stepped surface and the top surface of the first wall 353 , and then the first connecting portion 341 is stacked on top of the tab 331 .
  • the grooves of the insulating support 35 are not used to accommodate the tabs 331 and the first connecting portion 341 , but are used to reduce the weight of the insulating support 35 , so as to reduce the weight of the battery cell 30 .
  • the insulating bracket 35 is not provided with a groove, that is, the step surface of the step 3541 is connected to the top surface of the first wall 353 . That is, the groove is filled solid.
  • the tab 331 When the tab 331 is located in the receiving portion of the insulating bracket, the tab 331 can share space with the insulating bracket 35 without taking up extra space, so that the structure of the battery cell 30 is more compact, thereby improving the space utilization of the battery cell 30 Rate.
  • the groove may further include a third wall, which is a wall of the groove perpendicular to the first direction X and away from the electrode assembly 33, at least part of the top surface of the third wall is in the third direction Z is higher than the step surface, so that when the electrode assembly 33 and the insulating support 35 are assembled, the electrode assembly 33 and the insulating support 35 are against in the first direction X, so as to fix the electrode assembly 33 in the first direction X, and at the same time play a role The role of isolating the electrode assembly 33 and the casing 31 .
  • the end of the tab 331 of the electrode assembly 33 abuts against the third wall, so that the electrode assembly 33 can be limited and the structural stability of the battery cell can be improved.
  • the insulating support 35 When the insulating support 35 abuts against the electrode assembly 33 along the first direction X, part of the tab 331 may be damaged, for example, the gathered portion 331a of the tab 331 shown in FIG. 15 may be damaged.
  • the length of the bottom of the groove in the first direction X, is shorter than the length of the insulating support 35, that is, there is a length difference between the bottom of the groove and the insulating support 35 in the first direction X, Therefore, an avoidance space can be formed between the insulating support 35 and the electrode assembly 33 , and the avoidance space is used to avoid the gathered portion 331 a of the tab 331 .
  • the battery cell 30 further includes: a first insulator 37 disposed inside the casing 31 for isolating the casing 31 and the transition part 34 and the second insulator 38 disposed outside the case 31 for isolating the case 31 and the riveting part 39 of the electrode terminal 32 .
  • the riveting member 39 is used to fix the electrode terminal 33 .
  • the housing 31 is isolated from the adapter part 34 by the first insulating member 37 , and the housing 31 is isolated from the riveting member 39 by the second insulating member 38 , which can improve the safety of the battery cell 30 .
  • the first insulating member 37 is an extension 352 of the insulating bracket 35 . That is to say, the first insulating member 37 is integrally formed with the insulating bracket 35 .
  • the first insulating member 37 may be a sheet-like structure, and is disposed between the second connection portion 342 and the first split surface 313a.
  • the first insulator 37 can be bent toward the inside of the casing 31 along the first direction X to isolate the end of the second connecting portion 342 from the casing 31 , thereby further improving the safety of the battery cell 30 .
  • the first insulating member 37 is a component independent of the insulating support 35 .
  • the first insulating part 37 includes a first insulating part 371 and a second insulating part 372, and the first insulating part 371 is disposed between the first connecting part 341 and the shell 31 to isolate the shell 31 from the first connecting part. 341.
  • the second insulating portion 372 is connected to the first insulating portion 371 and disposed between the second connecting portion 342 and the transition surface 313c to isolate the housing 31 from the second connecting portion 342 .
  • first insulating portion 371 is perpendicular to the first direction X
  • second insulating portion 372 is perpendicular to the second direction Y.
  • the first subsurface 313a is provided with a first opening 3131
  • the electrode terminal 32 is disposed on the first subsurface through the first opening 3131.
  • the battery cell 30 further includes: a sealing ring 36 for sealing the gap between the electrode terminal 32 and the first opening 3131 .
  • the sealing member 36 is disposed outside the casing 31 , is sheathed on the electrode terminal 32 , and is located between the second insulating member 38 and the first split surface 313 a.
  • the transition surface 313c is provided with a first opening 3131, and the electrode terminal 33 is disposed on the transition surface 313c through the first opening 3131,
  • the battery cell 30 further includes: a sealing ring 36 for sealing the gap between the electrode terminal 33 and the first opening 3131 .
  • the sealing member 36 is disposed outside the casing 31 , is sheathed on the electrode terminal 32 , and is located between the second insulating member 38 and the transition surface 313c.
  • the arrangement of the sealing ring 36 can prevent the leakage of the electrolyte in the casing 31, thereby improving the safety of the battery cells.
  • the inner side of the sealing ring 36 may protrude from the outer side of the sealing ring 36 in the axial direction, and the inner side of the sealing ring 36 may be embedded into Inside the first opening 3131 of the first split surface 315a or the first opening 3131 of the transitional surface 315c.
  • the second insulating part 38 needs to be provided with openings, and the riveting part 39 needs to be provided with openings, and the electrode terminals 32 are provided on the first sub-surface 313a or the transitional surface 313c through the openings of each component.
  • both ends of the housing 31 in the first direction X may have the same structure.
  • the first facets 313 a of the pair of first side walls 313 arranged along the first direction X may be symmetrically arranged along the diagonal of the housing 31 or symmetrically arranged along the centerline of the housing 31 in the first direction X.
  • the positions of the electrode terminals 32 at both ends and the first side wall 313 may be exactly the same, or may be a combination of the above-mentioned various embodiments.
  • the polarities of the electrode terminals 32 disposed at both ends of the casing 31 in the first direction X are opposite. That is, the electrode terminal 32 provided at the first end may be a positive electrode terminal, and the electrode terminal 32 provided at the second end may be a negative electrode terminal. Alternatively, the electrode terminal 32 provided at the first end may be a negative electrode terminal, and the electrode terminal 32 provided at the second end may be a positive electrode terminal.
  • FIG. 16 shows a schematic exploded view of another battery cell 30 provided by the embodiment of the present application.
  • the electrode terminals 32 are disposed on the transition surface 313c, and the transition surface 313c is a plane.
  • the electrode terminal 32 includes a first part 321 and a second part 322, the electrode terminal 32 extends along the second direction Y, the first part 321 is connected to the tab 331, and the second part 322 passes through the transition surface 313c and protrudes to the container outside the casing 31.
  • the accommodating space 316 is formed by the first subsurface 313a, the second subsurface 313b and the transition surface 313c.
  • both the first part 321 and the second part 322 of the electrode terminal 32 are sheet-shaped, and the surfaces of the first part 321 and the second part 322 are substantially parallel to the bottom wall 315 .
  • the first part 321 and the tab 331 are stacked in a flat plate structure after assembly, therefore, the first part 321 and the tab 331 can be connected by ultrasonic welding, thereby reducing the risk of metal filings. produce.
  • the battery cell 30 further includes: an insulating support 35, which is disposed in the casing 31 and located between the electrode assembly 32 and the casing 31, and the insulating support 35 is used to support the The tab 331 and the electrode terminal 32 .
  • the insulating support 35 is used to support the tab 331 and the first portion 321 of the electrode terminal 32 .
  • the insulating bracket is provided with a receiving groove 351, which is used to accommodate the tab 331, and the first part 321 is connected to the tab 331 in the receiving slot 351, and the electrode terminal
  • the second part 322 of 32 passes through the side wall of the receiving groove 351 to pass through the transition surface 313c and extend to the receiving space 316
  • the accommodating space 316 may pass through the housing 31 along the third direction Z, in other words, the transition surface 313c is a plane.
  • the transition surface 315c is provided with a first opening (not shown in the figure), and the second portion 322 of the electrode terminal 32 extends to the accommodating space 316 through the first opening.
  • the battery cell 30 further includes: a sealing ring 36 for sealing the gap between the second portion 322 and the first opening.
  • the arrangement of the sealing ring 36 can prevent the leakage of the electrolyte in the shell 31, thereby improving the safety of the battery cells.
  • the inner side of the sealing ring 36 may protrude from the outer side of the sealing ring 36 in the axial direction, and the inner side of the sealing ring 36 It can be inserted into the first opening of the transition surface 313c.
  • the first electrode terminal 32 further includes a boss 323, the boss 323 is disposed between the first part 321 and the second part 322, and the outer contour of the cross section of the boss The size is larger than the size of the first opening of the transition surface 313c, and the boss 323 is disposed in the shell 31 .
  • the battery cell 30 further includes: an engaging portion 391 disposed outside the housing 31 , the engaging portion 391 engages with the second portion 322 , and Cooperate with the boss 323 to fix the first electrode terminal.
  • the second part 322 may further be provided with a locking slot, and the inner circumference of the engaging portion 391 is provided with a locking block engaged with the locking slot.
  • the engaging portion 391 is sheathed on the outer periphery of the second portion 322 , and inserts the locking block into the engaging slot on the second portion 322 .
  • the first part 321 , the second part 322 and the boss 323 can be integrally formed.
  • the first part 321 and the second part 322 are integrally formed, and the boss 323 is an independent component.
  • the second boss 323 can also be the engaging part 391 sleeved on the first part 321 .
  • Using the boss 323 and the engaging portion 391 to fix the electrode terminal 32 can limit the position of the electrode terminal 32 in the second direction Y, thereby increasing the structural stability of the battery cell 30 .
  • the side wall close to the boss 323 of the insulating support 35 and the A step structure is set between the bottom walls of the insulating support 35, so that the boss 323 can be accommodated in the space formed by the step structure, so that the surfaces of the first part 321 and the second part 322 of the electrode terminal 32 can be parallel to
  • the bottom wall of the housing 31 can make the tab 331 and the first part 321 contact flatly.
  • the side wall of the insulating support 35 also needs to be provided with a second opening (not shown in the figure), and the second part 322 passes through the second opening. , and extend to the accommodating space 316 through the first opening (not shown in the figure) of the transition surface 313c.
  • the engaging portion 391 can also be plastic, that is, when the second part 322 extends from the first opening to the accommodating space 316, glue can be injected along the periphery of the first opening, and after the glue is fixed The position of the electrode terminal 32 in the second direction Y is fixed together with the boss 323 .
  • the embodiment of the present application also provides a battery 100, the battery 100 includes a plurality of battery cells 30 and bus components 40 described in the above various embodiments, and the plurality of battery cells 30 are arranged along the third direction Z,
  • the bus member 40 is used to connect the electrode terminals 32 of two adjacent battery cells 30 among the plurality of battery cells 30 .
  • the transition surface 313c in the battery cell 30 is a plane, that is, the accommodating space 316 penetrates the casing 31 along the third direction, and the connection surfaces between the electrode terminals of two adjacent battery cells and the bus member 40 are located at one Plane, the flow-combining component 40 is a sheet structure. As shown in Figure 18.
  • FIG. 18 only shows a schematic diagram in which the electrode terminals 32 are arranged on the first split surface 313a, the connection relationship between the busbar 40 and the electrode terminal 32 shown in FIG.
  • the electrode terminals 32 are arranged in an embodiment of the transition surface 313c.
  • the transition surface 313c is a plane
  • the battery cell 30 adopts the structure of the battery cell shown in FIG. 16
  • the electrode terminals 32 of two adjacent battery cells 30 Parallel to the connecting surface of the flow-combining component 40
  • the flow-combining component has a U-shaped structure. As shown in Figure 19.
  • Adopting the battery 100 shown in FIG. 18 and FIG. 19 is beneficial to hide the flow-connection component 40 in the accommodation space 316 of the battery cell 30, without occupying additional assembly space of the battery cell 30, thereby improving the energy density of the battery 100. .
  • the transition surface 313c is an L-shaped folding surface
  • the confluence part 40 includes two connecting parts 41 and a spanning part 42, the two connecting parts 41 are connected to the spanning part 42, and the two The connecting portion 41 respectively connects the electrode terminals 32 of two adjacent battery cells 30 , and the spanning portion 42 straddles the second facet 313 b of one of the two adjacent battery cells 30 .
  • Figure 20 shows that
  • FIG. 19 only shows a schematic diagram in which the electrode terminals 32 are arranged on the first split surface 313a, the connection relationship between the busbar 40 and the electrode terminal 32 shown in FIG.
  • the folded surface and the electrode terminals 32 are disposed on the transition surface 313c in an embodiment.
  • An embodiment of the present application also provides an electric device, which may include the battery unit 30 in the foregoing embodiments, so as to provide electric energy for the electric device.
  • the electric device may be a vehicle, ship or spacecraft.
  • the electrode terminal 32 of the battery cell 30 can be accommodated in the accommodating space 316 formed by invading the edge region of the end of the casing 31 along the first direction X Therefore, the electrode terminal 32 can be hidden without occupying the space of the battery cell 30 in all directions, thereby improving the space utilization rate and facilitating the popularization and use of electric equipment.
  • FIG. 21 shows a schematic flowchart of a method 400 for preparing a battery cell according to an embodiment of the present application. As shown in FIG. 21 , the method 400 may include at least part of the following content.
  • the casing 31 includes a casing 311 and a cover plate 312, the casing 311 includes a pair of first side walls 313 oppositely arranged along the first direction X, and a pair of first side walls 313 oppositely arranged along the second direction Y Two side walls 314 and a bottom wall 315, the cover plate 312 covers the housing 311, the cover plate 312 and the bottom wall 315 are arranged opposite to each other along the third direction, the first direction X, the second The second direction Y and the third direction Z are perpendicular to each other, the area of the bottom wall 315 is larger than the area of the first side wall 313 , and the area of the bottom wall 315 is larger than the area of the second side wall 314 .
  • the first side wall 313 includes a first split surface 313a, a second split surface 313b and a transition surface 313c, and the first split surface 313a and the second split surface 313b are connected by the transition surface 313c, so Both the first split plane 313a and the second split plane 313b are perpendicular to the first direction X, and the first split plane 313a is closer to the housing 31 than the second split plane 313b in the first direction X.
  • the sum of the areas of the first sub-surface 313a and the second sub-surface 313b is smaller than the area of the second side wall 314, and the first sub-surface 313a and the second side wall
  • the sum of the areas of the split surfaces 313b is smaller than the area of the bottom wall 315, and the electrode terminal 32 is disposed on the first split surface 313a or the transition surface 313c.
  • At least part of the following content may be continued.
  • the plurality of battery cells 30 are arranged along the third direction Z. As shown in FIG.
  • a current-combining member 40 is provided for connecting the electrode terminals 32 of two adjacent battery cells 30 among the plurality of battery cells 30 .
  • FIG. 22 shows a schematic block diagram of a device 500 for preparing a battery cell according to an embodiment of the present application.
  • the device 500 includes a providing module 510 for: providing electrode terminals 32 ; providing a housing 31 , the housing 31 includes a housing 311 and a cover 312 , and the housing 311 includes a housing 311 disposed opposite to each other along the first direction X.
  • the bottom wall 315 is arranged opposite to each other along the third direction, the first direction X, the second direction Y and the third direction Z are perpendicular to each other, and the area of the bottom wall 315 is larger than the area of the first side wall 313 , the area of the bottom wall 315 is greater than the area of the second side wall 314 .
  • the first side wall 313 includes a first split surface 313a, a second split surface 313b and a transition surface 313c, and the first split surface 313a and the second split surface 313b are connected by the transition surface 313c, so Both the first split plane 313a and the second split plane 313b are perpendicular to the first direction X, and the first split plane 313a is closer to the housing 31 than the second split plane 313b in the first direction X.
  • the sum of the areas of the first sub-surface 313a and the second sub-surface 313b is smaller than the area of the second side wall 314, and the first sub-surface 313a and the second sub-surface 313a
  • the sum of the areas of the split surfaces 313b is smaller than the area of the bottom wall 315, and the electrode terminal 32 is disposed on the first split surface 313a or the transition surface 313c.
  • the device 500 may further include the following module: an assembly module, configured to arrange the plurality of battery cells 30 along the third direction Z.
  • the providing module 510 is also used for: providing a flow-combining component 40 for connecting the electrode terminals 32 of two adjacent battery cells 30 among the plurality of battery cells 30 .

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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

Les modes de réalisation de la présente demande concernent une cellule de batterie, une batterie, un dispositif électrique, et un procédé et un appareil de préparation d'une cellule de batterie. La cellule de batterie comprend une borne d'électrode et un boîtier, qui comprend un corps de boîtier et une plaque de couvercle, une première paroi latérale comprenant une première sous-face, une seconde sous-face et une face de transition, la première sous-face et la seconde sous-face étant reliées au moyen de la face de transition, la première sous-face et la seconde sous-face étant toutes deux perpendiculaires à une première direction, la première sous-face étant plus proche d'une position intermédiaire du boîtier dans la première direction que la seconde sous-face, la somme de la surface de la première sous-face et de la surface de la seconde sous-face étant inférieure à la surface d'une seconde paroi latérale, et la somme de la surface de la première sous-face et de la surface de la seconde sous-face étant inférieure à la surface d'une paroi inférieure ; et la borne de l'électrode est disposée sur la première sous-face ou sur la face de transition. Au moyen de la cellule de batterie des modes de réalisation de la présente demande, le taux d'utilisation d'espace de la cellule de batterie peut être amélioré.
PCT/CN2021/130145 2021-11-11 2021-11-11 Cellule de batterie, batterie, dispositif électrique, et procédé et appareil de préparation de cellule de batterie WO2023082152A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/CN2021/130145 WO2023082152A1 (fr) 2021-11-11 2021-11-11 Cellule de batterie, batterie, dispositif électrique, et procédé et appareil de préparation de cellule de batterie
CN202180073998.6A CN116458004A (zh) 2021-11-11 2021-11-11 电池单体、电池、用电设备以及制备电池单体的方法和装置
CN202222855753.3U CN219017776U (zh) 2021-11-11 2022-10-28 电池单体、电池、用电装置以及制备电池单体的装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2021/130145 WO2023082152A1 (fr) 2021-11-11 2021-11-11 Cellule de batterie, batterie, dispositif électrique, et procédé et appareil de préparation de cellule de batterie

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WO2023082152A1 true WO2023082152A1 (fr) 2023-05-19

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WO (1) WO2023082152A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107710459A (zh) * 2015-06-15 2018-02-16 株式会社东芝 电池及电池包
CN110021716A (zh) * 2018-01-08 2019-07-16 比亚迪股份有限公司 电池单元、电池模组及汽车
CN212323156U (zh) * 2020-03-18 2021-01-08 深圳市首航新能源股份有限公司 一种电池包以及电池系统
CN112310514A (zh) * 2020-10-27 2021-02-02 合肥国轩高科动力能源有限公司 锂离子电池
CN214589168U (zh) * 2021-05-14 2021-11-02 中航锂电科技有限公司 电池及电池组
CN214589167U (zh) * 2021-05-14 2021-11-02 中航锂电科技有限公司 电池及电池模组

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107710459A (zh) * 2015-06-15 2018-02-16 株式会社东芝 电池及电池包
CN110021716A (zh) * 2018-01-08 2019-07-16 比亚迪股份有限公司 电池单元、电池模组及汽车
CN212323156U (zh) * 2020-03-18 2021-01-08 深圳市首航新能源股份有限公司 一种电池包以及电池系统
CN112310514A (zh) * 2020-10-27 2021-02-02 合肥国轩高科动力能源有限公司 锂离子电池
CN214589168U (zh) * 2021-05-14 2021-11-02 中航锂电科技有限公司 电池及电池组
CN214589167U (zh) * 2021-05-14 2021-11-02 中航锂电科技有限公司 电池及电池模组

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