WO2023185283A1 - Batterie - Google Patents

Batterie Download PDF

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Publication number
WO2023185283A1
WO2023185283A1 PCT/CN2023/075904 CN2023075904W WO2023185283A1 WO 2023185283 A1 WO2023185283 A1 WO 2023185283A1 CN 2023075904 W CN2023075904 W CN 2023075904W WO 2023185283 A1 WO2023185283 A1 WO 2023185283A1
Authority
WO
WIPO (PCT)
Prior art keywords
adapter
battery core
side plate
tab
connecting piece
Prior art date
Application number
PCT/CN2023/075904
Other languages
English (en)
Chinese (zh)
Inventor
卫志达
彭宁
谢继春
王智峰
厉成北
章辉
席阳
Original Assignee
珠海冠宇电池股份有限公司
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.)
Filing date
Publication date
Application filed by 珠海冠宇电池股份有限公司 filed Critical 珠海冠宇电池股份有限公司
Publication of WO2023185283A1 publication Critical patent/WO2023185283A1/fr

Links

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
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
    • H01M50/627—Filling ports
    • 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
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery 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
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
    • H01M50/627—Filling ports
    • H01M50/636—Closing or sealing filling ports, e.g. using lids
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the invention relates to the field of electrochemical energy storage devices, and in particular to a battery.
  • lithium-ion batteries have the advantages of large capacity, small size, light weight and environmental protection, and have been widely used in industries such as digital electronic products and electric vehicles.
  • industries such as digital electronic products and electric vehicles.
  • the requirements for the sealing and safety of batteries are getting higher and higher. Therefore, it is urgent to improve the sealing and safety of batteries.
  • the invention provides a battery with good sealing performance, safety and other properties.
  • the invention provides a battery, which includes: a casing, which is surrounded by a cavity; the casing includes a first side plate, and the first side plate is provided with a first through hole communicating with the cavity; and a battery core. , located in the cavity; the battery core is provided with a first tab; a first adapter is electrically connected to the first tab; the first adapter is provided on the first side plate and Between the battery cores, the first adapter is provided with a second through hole, the first adapter is connected to the first side plate, and the first through hole is connected to the second through hole.
  • the projections of the holes on the first side panel at least partially overlap.
  • one of the projections of the first through hole and the second through hole on the first side plate covers the other; and/or, the first through hole and the second through hole cover the other.
  • the concentricity of the second through hole is less than or equal to 1.5mm.
  • the first through hole and the second through hole are coaxially arranged.
  • the projection of the first adapter on the first side plate does not overlap with the projection of the first tab on the first side plate.
  • the housing further includes a second side plate connected to the first side plate, and the projection of the first adapter on the second side plate is consistent with the first side plate.
  • the projections of the tabs on the second side plate at least partially overlap.
  • the battery further includes a first coupling member located between the battery core and the first side plate, and the first coupling member is connected to the first tab and the first side plate respectively.
  • the first adapter connection is located between the battery core and the first side plate, and the first coupling member is connected to the first tab and the first side plate respectively.
  • the first connecting member includes a first connecting piece connected to the first adapter member, and a first connecting piece connected to a side of the first tab away from the battery core.
  • the fourth connecting piece is connected to the first connecting piece connected to the first adapter member, and a first connecting piece connected to a side of the first tab away from the battery core.
  • the first connecting piece further includes a connecting component connected to the first connecting piece and the fourth connecting piece respectively;
  • the connecting component includes a second connecting piece and a third connecting piece;
  • the second connecting piece is located between the first adapter and the battery core; in the direction from the first adapter to the first tab, the
  • the third connecting piece is located between the first tab and the first adapter; the first connecting piece, the second connecting piece, the third connecting piece, and the fourth connecting piece are connected in sequence.
  • the first connecting piece includes a first connecting portion connected to the first adapter and a second connecting portion extending along the extending direction of the first side plate, so The second connecting part is connected to the fourth connecting piece.
  • a sixth insulating layer is provided on a side of the first connecting piece away from the first adapter; and/or, the first adapter is connected to the first connecting piece.
  • a first included angle is formed between the side where the sheets are connected and the side where the fourth connecting piece is connected to the first tab, and the range of the first included angle is 80-120°; and/or,
  • the first connecting piece is welded to the first adapter piece; and/or the battery core includes a plurality of stacked electrode pieces, and the first connecting piece is connected to the first adapter piece.
  • One side is parallel to the surface of the electrode sheet; and/or, the side of the first adapter connecting to the first side plate and the side of the first adapter connecting to the first connecting piece
  • a second included angle is formed between one side, and the range of the second included angle is 80-120°; and/or, the projection of the first adapter in the thickness direction of the battery core is consistent with the projection of the first adapter in the thickness direction of the battery core.
  • a third groove is provided on a side of the first adapter away from the first side plate, and the third groove is connected to the second through hole and the cavity respectively. Body connected.
  • the third groove is parallel to a side along the first adapter facing the first side plate to a side of the first adapter away from the first side plate.
  • the cross-section in the direction is arc-shaped; and/or, the minimum thickness of the first adapter in the direction from the first side plate to the first adapter is 0.2 mm to 1 mm; and/or Or, the minimum thickness of the first adapter member along the thickness direction of the battery core is 0.2 mm to 1 mm.
  • the first adapter includes a first adapter portion and a second adapter portion surrounding the third groove, and the first adapter portion is provided with the third adapter portion.
  • Two through holes the first adapter portion is connected to the first side plate;
  • the battery further includes a first coupling member, the first coupling member is respectively connected to the first tab and the second The adapter part is connected; one or more reinforcing ribs are provided between the second adapter part and the first adapter part.
  • the connecting portion of the second adapter part and the first adapter part has a reinforced area corresponding to the position of the reinforcing rib, and the reinforced area is close to the second adapter part.
  • the angle direction between the connecting portion and the first adapter portion is recessed to form the reinforcing rib; and/or, one end of the reinforcing rib is connected to the first adapter portion and the reinforcing rib is connected to the first adapter portion.
  • the angle between the connecting end of the second adapter part and the surface of the first adapter part is 30° to 60°; and/or, the reinforcing rib and the first adapter part
  • the angle between the connecting end and the connecting end of the reinforcing rib and the second adapter part and the surface of the second adapter part is 30° to 60°.
  • the first adapter further includes a third adapter part connected to the first adapter part, and the third adapter part and the second adapter part are respectively located at Opposite sides of the first adapter part.
  • a third insulating layer is further included, and the third insulating layer is located between the first coupling member and the first side plate.
  • the first connecting member includes a fourth connecting piece connected to a side of the first tab away from the battery core, and the third insulating layer includes a The side of the four connecting pieces facing away from the first tab The first part.
  • the battery core includes a plurality of stacked electrode sheets; the battery core has a first surface and a second surface arranged oppositely; the third insulating layer further includes a layer from the first part. a second portion extending from one end of the first surface close to the battery core in a direction close to the battery core; and from an end of the first portion close to the second surface of the battery core in a direction close to the battery core.
  • the extension forms the third part.
  • the projection of the first tab in the thickness direction of the battery core is located within the projection of the second part of the third insulating layer in the thickness direction of the battery core, and /or, the projection of the first tab in the thickness direction of the battery core is located within the projection of the third part of the third insulating layer in the thickness direction of the battery core; and/or, the The projection of the first tab in the length direction of the battery core is located within the projection of the first part of the third insulating layer in the length direction of the battery core.
  • the second part of the third insulating layer extends to the first side of the battery core and is bonded to the electrode sheet located on the first side of the battery core; and/or, the The third part of the third insulating layer extends to the second surface of the battery core and is bonded to the electrode sheet located on the second surface of the battery core.
  • a second insulation layer is provided between the first adapter and the battery core.
  • the battery includes a plurality of stacked electrode sheets, and the battery core has a first side and a second side arranged oppositely, wherein the second insulating layer extends to the battery core. and/or the second insulating layer extends to the second side of the battery core and is bonded to the electrode sheet located on the first side of the battery core. The electrode sheets on both sides are bonded.
  • the end surface of the side of the battery core provided with the first tab is parallel to the thickness direction of the battery core; and/or, the first tab is away from the battery core.
  • the distance from one side to the side where the first tab is connected to the battery core is no longer than the length of the first adapter along the direction from the first side plate to the first tab; And/or, along the direction from the first side plate to the first tab, the length of the first adapter is 1mm-4mm; and/or, the first adapter part and the third One side panel is welded.
  • the battery core is further provided with a second tab, and the second tab has an opposite polarity to the first tab;
  • the battery further includes a second adapter, so The second adapter is electrically connected to the second tab, the second adapter is disposed between the first side plate and the battery core, and the second adapter is on the first side.
  • the projection on the board does not overlap with the projection of the second tab on the first side board.
  • the housing includes a second side plate connected to the first side plate; the projection of the first pole on the second side plate is in line with the second pole.
  • the projection of the ear on the second side panel at least partially overlaps; and/or the projection of the second adapter on the second side panel and the projection of the second pole tab on the second side panel
  • the projection on the second side panel at least partially overlaps; and/or the projection of the first adapter member on the second side panel at least partially overlaps with the projection of the second adapter member on the second side panel.
  • the first tab and the second tab are located between the first adapter and the second adapter; and/or, the second tab is away from the The distance from one side of the battery core to the side where the second tab is connected to the battery core is no greater than the direction of the second adapter along the first side plate to the second tab. length; and/ Or, along the direction from the first side plate to the second pole, the length of the second adapter is 1mm-3mm; and/or, along the direction from the first side plate to the second pole In the direction of the ear, the length of the second adapter is smaller than the length of the first adapter.
  • the first tab is a negative tab or a positive tab; and/or, the battery core includes a laminated battery core or a wound battery core.
  • the first through hole is used as a liquid injection hole for injecting electrolyte into the cavity.
  • the first side plate provided with the first through hole is connected to the first adapter part of the first adapter, and The first through hole at least partially overlaps with the second through hole.
  • the first through hole communicates with the cavity through the second through hole to realize liquid injection.
  • the first adapter part can surround the first side plate in the first through hole.
  • the peripheral part i.e., the side wall of the first through hole
  • the peripheral part i.e., the side wall of the first through hole
  • Figure 1 is a schematic structural diagram of a battery according to an embodiment of the present invention.
  • Figure 2 is a schematic diagram of the connection structure of the first adapter, the first coupling part and the housing according to an embodiment of the present invention
  • Figure 3 is a schematic diagram of the connection structure of the first adapter, the first coupling part and the housing according to an embodiment of the present invention
  • Figure 4 is a schematic diagram of the connection structure between the first adapter and the housing according to an embodiment of the present invention.
  • Figure 5 is a schematic diagram of the connection structure between the first adapter and the housing according to an embodiment of the present invention.
  • Figure 6 is a schematic structural diagram of the first adapter according to an embodiment of the present invention.
  • Figure 7 is a schematic structural diagram of the first adapter according to an embodiment of the present invention.
  • Figure 8 is a schematic structural diagram of the first adapter according to an embodiment of the present invention.
  • Figure 9 is a schematic cross-sectional view of the first adapter according to an embodiment of the present invention.
  • Figure 10 is a schematic cross-sectional view of the first adapter according to an embodiment of the present invention.
  • Figure 11 is a schematic structural diagram of the first adapter according to an embodiment of the present invention.
  • Figure 12 is a schematic diagram of the connection structure between the second adapter and the housing according to an embodiment of the present invention.
  • Figure 13 is a schematic diagram of the connection structure between the second adapter and the housing according to an embodiment of the present invention.
  • Figure 14 is a schematic structural diagram of a second insulating sheet according to an embodiment of the present invention.
  • Figure 15 is a schematic structural diagram of a battery core package according to an embodiment of the present invention.
  • Figure 16 is a schematic structural diagram of a battery core package according to an embodiment of the present invention.
  • the terms “set”, “installation”, “connection”, “connected”, “connected”, etc. should be understood in a broad sense.
  • they can be fixed connections, It can be a detachable connection or an integrated connection; it can be a mechanical connection, an electrical connection, or a communication connection (network connection); it can be a direct connection, or an indirect connection through an intermediary, or It is the internal connection between the two components.
  • the above-mentioned specific meanings in the present invention can be understood in specific situations.
  • Batteries are commonly used electrochemical energy storage devices. They generally include a casing, an electric core packaged in a cavity surrounded by the casing, and an electrolyte injected into the cavity.
  • the casing is provided with a liquid injection hole. It is used to inject electrolyte into the cavity. After injecting the electrolyte, the injection hole is sealed.
  • a sealing piece is welded on the shell around the injection hole to seal the injection hole to achieve sealing.
  • the shell around the liquid injection hole is easily deformed, resulting in poor sealing performance.
  • an embodiment of the present invention provides a battery, as shown in Figures 1 to 16.
  • the battery includes: a housing 1, which is surrounded by a cavity; the housing 1 includes a first side plate 11, and the first side plate 11 is provided with a first through hole 100 communicating with the cavity; the battery core 2 is located in the cavity; the battery core 2 is provided with a first tab 21; a first adapter 31 is electrically connected to the first tab 21; An adapter 31 is disposed between the first side plate 11 and the battery core 2.
  • the first adapter 31 is provided with a second through hole 310.
  • the first adapter 31 is connected to the first side plate 11.
  • the first adapter 31 is connected to the first side plate 11.
  • the projections of the through hole 100 and the second through hole 310 on the first side plate 11 at least partially overlap (that is, the projection of the first through hole 100 parallel to the extension direction of the first side plate 11 and the projection of the second through hole 310 parallel to the first side plate 11
  • the projections of the extension directions of the side panels 11 at least partially overlap).
  • the first through hole 100 provided on the first side plate 11 can be used as a liquid injection hole to connect the first side plate 11 to the first adapter portion 311, so that the first through hole 100 and the second through hole 310 are at least Partially overlapped, the first through hole 100 communicates with the cavity through the second through hole 310 for liquid injection, and the first adapter 31 and the first side plate 11 surround the portion around the first through hole 100 ( That is, the part of the housing 1 around the liquid injection hole is connected, so that the first adapter 31 supports the part of the first side plate 11 surrounding the first through hole 100 to prevent the first side plate 11 from being surrounded by The portion around the first through hole 100 is deformed during the sealing and welding of the liquid injection hole, thereby facilitating the welding of the sealing sheet and improving the sealing performance after the liquid injection hole is sealed.
  • the radius of the projection of the first through hole 100 on the first side plate 11 is r 1
  • the radius of the projection of the second through hole 310 on the first side plate 11 is r 2
  • the radius of the first through hole 100 on the first side plate 11 is r 2
  • the distance between the projected circle center on the first side plate 11 and the projected circle of the second through hole 310 on the first side plate 11 is L ⁇ r 1 +r 2 .
  • r 1 ⁇ r 2 or r 1 ⁇ r 2 .
  • the projection of the first through hole 100 on the first side plate 11 and the projection of the second through hole 310 on the first side plate 11 may partially overlap or completely overlap.
  • the case of full overlap may specifically include: One of the projection of the hole 100 on the first side plate 11 and the projection of the second through hole 310 on the first side plate 11 covers the other, that is, the projection of the first through hole 100 on the first side plate 11
  • the projection of the second through hole 310 on the first side plate 11 is covered, or the projection of the second through hole 310 on the first side plate 11 covers the projection of the first through hole 100 on the first side plate 11 .
  • the radius (or area) of the projection of the second through hole 310 on the first side plate 11 is smaller than the projection of the first through hole 100 on the first side plate 11 , and the second through hole 310 is on the first side.
  • the projection on the board 11 is located within the projection of the first through hole 100 on the first side panel 11; or, the radius (or area) of the projection of the first through hole 100 on the first side panel 11 is smaller than the projection of the second through hole 310 on the first side panel 11.
  • the projection of the first through hole 100 on the first side panel 11 is located within the projection of the second through hole 310 on the first side panel 11; or, the first through hole 100 is located on the first side panel 11.
  • the concentricity between the first through hole 100 and the second through hole 310 is less than or equal to 1.5 mm, that is, the center of the projection of the first through hole 100 on the first side plate 11 and the second through hole 310
  • the distance between the projected circle centers on the first side plate 11 is less than or equal to 1.5 mm.
  • first tab 21 can be electrically connected to the first side plate 11 (casing 1) through the first adapter 31, and the first adapter 31 and the first side plate 11 can be welded.
  • the above-mentioned battery may also include a first connecting member 5 located between the battery core 2 and the first side plate 11.
  • the first connecting member 5 is connected to the first tab 21 and the first adapter 31 respectively (i.e., the first adapter
  • the member 31 is connected to the first tab 21 through the first coupling member), specifically, the first adapter 31, the first coupling member 5, and the first tab 21 may be welded in sequence.
  • the first coupling member 5 may include a first connecting piece 51 connected to the first adapter 31 and a fourth connecting piece 54 connected to a side of the first tab 21 away from the battery core 2 .
  • the first connecting piece may have a bent structure, the first connecting piece 51 is connected to the first adapter 31, and the fourth connecting piece 54 is connected to the first tab. 21 are connected to each other, specifically welding, a side of the first adapter 31 that is connected to the first connecting piece 51 and a side that is connected to the fourth connecting piece 54 and the first tab 21 are formed.
  • the first included angle ranges from 80° to 120°, such as 80°, 90°, 100°, 110°, 120°, etc., that is, the first adapter 31 and the first connecting piece 51 are connected.
  • One side is not parallel to the side where the fourth connecting piece 54 is connected to the first tab 21, and may be perpendicular to it, for example.
  • the interface between the first adapter 31 and the first connecting piece 51 and the interface between the fourth connecting piece 54 and the first tab 21 are staggered, so that the two interfaces are basically along the direction of the battery core.
  • the arrangement in the width direction can not only reduce the space occupied by the first adapter 31 and the first connecting piece 51 in the cavity, but also improve the connection between the first adapter 31 and the first connecting piece 51 and the fourth connecting piece. 54 and the first tab 21 do not interfere with each other, and can further improve the stability of the connection between the first adapter 31 and the first tab 21 through the first coupling member, thereby improving the stability, safety and use of the battery. Quality such as longevity.
  • the side of the first adapter 31 that is connected to the first connecting piece 51 and the side of the first adapter 31 that is connected to the first side plate 11 are formed between them, and the range of the second included angle is 80-120°, such as 80°, 90°, 100°, 110°, 120°, that is, the two are not parallel, and may be perpendicular to each other, for example.
  • the battery core 2 includes a plurality of stacked electrode sheets, and the side of the first connecting sheet 51 that is in contact with the first adapter 31 may be parallel to the surface of the electrode sheets.
  • the first coupling member further includes a first connection component connected to the first connection piece 51 and the fourth connection piece 54 respectively, and the first connection component includes a second connection piece.
  • the second connecting piece 52 is located between the first adapter 31 and the battery core 2; in the direction from the first adapter 31 to the first tab 21, the third connecting piece 52 is located between the first adapter 31 and the battery core 2.
  • 53 is located between the first adapter 31 and the first tab 21; the first connecting piece 51, the second connecting piece 52, the third connecting piece 53, and the fourth connecting piece 54 are connected in sequence.
  • the first connecting piece has a multiple bending structure, and its first connecting piece 51 is connected to the fourth connecting piece 54 through the second connecting piece 52 and the third connecting piece 53 in sequence, and the surface of the first connecting piece 51 is connected to the fourth connecting piece 54 .
  • the surfaces of the two connecting pieces 52 are not parallel, for example, perpendicular.
  • the surfaces of the second connecting piece 52 and the third connecting piece 53 are not parallel, and may be perpendicular or non-perpendicular.
  • the surfaces of the fourth connecting piece 54 and the surfaces of the second connecting piece 52 are not parallel. The surfaces can be parallel.
  • the first connecting piece 51, the second connecting piece 52, the third connecting piece 53 and the fourth connecting piece 54 can be prevented from shaking in the left and right directions and the front and rear directions. , the stability of the connection between the first adapter 31 and the first tab 21 can be further improved.
  • the first connecting piece 51 includes a first connecting portion 511 connected to the first adapter 31 and an extension direction along the first side plate 11 (such as from the first side plate 11 ).
  • the second connecting portion 512 extends from the adapter 31 to the direction of the first tab 21 .
  • the second connecting portion 512 is connected to the fourth connecting piece 54 .
  • the first connection part 511 and the second connection part 512 are located on the same side of the first adapter 31 and on the same side of the first tab 21 .
  • the first connection part 511 can be located away from the first adapter 31 .
  • the second connecting portion 512 may be specifically located on the side of the first tab 21 away from the sixth side plate 16 .
  • the angle formed between the side of the second connecting portion 512 facing the first tab 21 and the side of the fourth connecting piece 54 that contacts the first tab 21 may range from 80° to 120°, such as 80° or 90°. °, 100°, 110°, 120°, that is, the two are not parallel, for example, they can be perpendicular.
  • first connecting part 511 and the second connecting part 512 can be integrally formed to form the first connecting piece 51 , and the surfaces of the first connecting part 511 and the second connecting part 512 can be substantially flush, that is, the first connecting piece 51 can be It is a straight structure, There is no large degree of bending, but it is not limited to this.
  • the surface of the first connecting piece 51 and the surface of the fourth connecting piece 54 are not parallel, for example, perpendicular.
  • first connecting piece 51 and the first adapter 31 may be welded, and a welding mark is formed on the side of the first connecting piece 51 away from the first adapter 31 .
  • first connection piece 51 includes the above-mentioned first connection part 511 and the second connection part 512
  • first connection part 511 and the first adapter 31 may be welded, and when the first connection part 511 is away from the first adapter, A welding mark is formed on one side of the connector 31 .
  • a third groove 300 is provided on the side of the first adapter 31 away from the first side plate 11 .
  • the third groove 300 is connected to the second through hole 310 and the cavity respectively.
  • a through hole 100, a second through hole 310, a third groove 300, and the cavity are connected in sequence, so that the first through hole 100 is connected to the cavity.
  • the third groove 300 can be used as an electrolyte flow channel to facilitate the electrolyte flow. injection.
  • the third groove 300 is parallel to a side along the first adapter 31 facing the first side plate 11 to a side of the first adapter 31 facing away from the first side plate 11 .
  • the cross section in the side direction is arc-shaped, for example, a semicircle (the first adapter 31 has an arched structure). In this way, along the depth direction of the third groove 300, the sides of the third groove 300 are surrounded.
  • the thickness of the wall gradually increases (that is, the closer to the inside of the third groove 300, the thicker the side wall around the third groove 300), thereby facilitating the first adapter
  • the parts 31 are welded to the first side plate 11 and the first connecting piece 51 respectively to avoid large deformation during the welding process of the first adapter 31 and the first connecting piece 51, which will affect the stability of the connection structure, thereby improving the stability of the connection structure. Battery manufacturing yield and performance.
  • the thickness of the thinnest part of the first adapter 31 (the minimum thickness of the side wall surrounding the third groove 300) can be 0.2 mm to 1 mm, such as 0.2 mm, 0.5 mm, 0.8 mm, 1 mm, etc.
  • the thickness of the thinnest portion refers to the thickness in the direction from the side facing the third groove 300 to the side facing away from the third groove 300 .
  • the minimum thickness of the first adapter 31 in the direction from the first side plate 11 to the first adapter 31 is 0.2 mm to 1 mm, such as 0.2 mm, 0.5 mm, 0.8mm, 1mm, etc.; the minimum thickness of the first adapter 31 along the thickness direction of the battery core 2 is 0.2mm ⁇ 1mm, such as 0.2mm, 0.5mm, 0.8mm, 1mm, etc.
  • the third groove 300 penetrates the first adapter 31 , that is, the axial direction of the third groove 300 is the same as the length direction of the first adapter 31 .
  • the surface of the first adapter 31 that contacts the first connecting piece 51 and the surface that contacts the first side plate 11 are respectively parallel to the length direction of the first adapter 31 .
  • the axial direction of the third groove 300 and the axial direction of the second through hole 310 may be perpendicular.
  • the first adapter 31 has a first adapter portion 311 , and one end of the first adapter portion 311 on the side away from the first side plate 11 extends outward to form a second adapter.
  • the connecting portion 312, the second connecting portion 312 and the first connecting portion 311 are surrounded by a third groove 300, or the other end of the first connecting portion 311 away from the first side plate extends outward to form a third groove 300.
  • Three adapter parts 313 , the third adapter part 313 , the first adapter part 311 , and the second adapter part 312 surround the third groove 300 .
  • the lengths of the first adapter part 311, the second adapter part 312, the third adapter part 313, and the third groove 300 are The direction (also the axial direction of the third groove 300) and the length are the same.
  • the thickness of the second adapter part 312 and the thickness of the third adapter part 313 gradually increase, so that the cross section of the third groove 300 is arc-shaped.
  • the side of the second adapter portion 312 facing away from the first adapter portion 311 and the side of the third adapter portion 313 facing away from the first adapter portion 311 are basically on the same plane, so that the cross-section of the third groove 300 is semicircular. shape.
  • the first adapter 31 can be integrally formed, for example, formed by bending a sheet metal piece, or formed by metal powder metallurgy.
  • the first adapter 31 includes a first adapter portion 311 and a second adapter portion 312 surrounding a third groove 300 , and a second through hole.
  • 310 is provided on the first adapter part 311, the first adapter part 311 is connected with the first side plate 11, the first coupling part is connected with the second adapter part 312, specifically the first connection of the first coupling part
  • the piece 51 is connected to the side of the second adapter portion 312 away from the third groove 300 , so that the first adapter 31 is connected to the first tab 21 through the first coupling element.
  • an included angle is formed between the first adapter 311 and the second adapter 312 , and the included angle is, for example, not greater than 90° (that is, the angle between the two surfaces or planes is not greater than 90°. °), one or more reinforcing ribs 315 are provided between the second adapter part 312 and the first adapter part 311.
  • the reinforcing rib 315 is located in the third groove 300, specifically at the angle between the first adapter part 311 and the second adapter part 312.
  • One end of the reinforcing rib 315 is connected to the first adapter part 311, and the other end is connected to the second adapter part 311.
  • the adapter part 312 is connected to support the first adapter part 311 and the second adapter part 312, improve the structural stability of the first adapter part 31, and avoid deformation during the welding and other processes of the second adapter part 312. Phenomenon.
  • the connecting portion between the second adapter portion 312 and the first adapter portion 311 has a reinforced area 314 corresponding to the position of the reinforcing rib 315 .
  • the reinforced area 314 is closer to the second adapter portion 312 and the first adapter portion 311 .
  • the angular direction of the first adapter part 311 (the direction facing the third groove 300) is recessed and a reinforcing rib 315 is formed, that is, in the reinforced area 314, the contact area between the second adapter part 312 and the first adapter part 311
  • the outer side (the side away from the third groove 300/the side facing the first side plate 11) is recessed to form a fourth groove.
  • the fourth groove has two opposite side walls and is located between the two side walls.
  • the bottom wall that is, the reinforcing rib 315), one side wall is connected to the first adapter part 311 and extends from the side connected with the first adapter part 311 to the bottom wall, and the other side wall is connected to the second adapter part 311.
  • the portion 312 is connected to and extends toward the bottom wall from the side connecting the second adapter portion 312 , and the cross-sectional shape of the fourth groove side wall is, for example, a triangle.
  • the reinforcing ribs 315 may be formed by punching from the reinforcing area, that is, punching from the outside of the connecting part of the second adapter part 312 and the first adapter part 311 to make it move toward the first adapter part 311 and the third adapter part 311 .
  • the angle direction of the two adapter portions 312 is recessed to form a reinforcing rib 315 .
  • the connecting line between one end of the reinforcing rib 315 and the first adapter part 311 and the end of the reinforcing rib 315 and the second adapter part 312 are connected to the first adapter part 311
  • the included angle (fifth included angle ⁇ 1) of the surface (the surface where the first adapter part and the reinforcing rib 315 are connected) is 30° to 60°, such as 30°, 35°, 40°, 45°, 50°, 55°, 60°, etc.
  • the included angle (sixth included angle ⁇ 2 ) of the side that is in contact with the reinforcing rib 315 is 30-60°, such as 30°, 35°, 40°, 45°, 50°, 55°, 60°, etc.
  • the side of the reinforcing rib 315 located in the third groove 300 is an inclined plane (one end thereof is opposite to the first adapter portion 311 (the other end is connected to the second adapter part 312), then the angle between the inclined surface and the surface where the first adapter part 311 and the reinforcing rib 315 are connected is 30° to 60°, and the inclined surface and the second adapter part 312 are connected at an angle of 30° to 60°.
  • the included angle between the connecting surface of the adapter portion 312 and the reinforcing rib 315 is 30° to 60°.
  • the first adapter 31 further includes a third adapter 313 connected to the first adapter 311 .
  • the third adapter 313 and the second adapter 312 are respectively located on the first adapter.
  • the opposite sides of the adapter part 311, that is, the third adapter part 313, the first adapter part 311, and the second adapter part 312 are connected in sequence to form a third groove 300.
  • the first adapter part 311 forms a third groove 300.
  • the bottom wall of the three grooves 300, the second adapter part 312, and the third adapter part 313 respectively form the side walls of the third groove 300.
  • the third groove 300 faces away from the opening of the first adapter part 311 towards the cavity/ Cell 2.
  • One side of the second adapter part 312 is in contact with one side of the first adapter part 311 , and the other side of the second adapter part 312 is along the thickness direction of the first adapter part 311 (the first adapter part 311 is away from the direction of the first side plate) extends outward, one side of the third adapter portion 313 is connected to the other side of the first adapter portion 311, and the other side of the third adapter portion 313 extends along the first adapter portion
  • the thickness direction of 311 extends outward.
  • the longitudinal direction and length of the first adapter part 311, the second adapter part 312, and the third adapter part 313 can be the same.
  • the lengths of the second adapter part 312 and the third adapter part 313 The width direction and width may be the same, and the width direction is the same as the thickness direction of the first adapter portion 311 .
  • the second through hole 310 may be disposed in the middle of the first adapter part 311 without extending to the second adapter part 312 and the third adapter part 313.
  • the distance from the second through hole 310 to the second adapter part 312 is equal to
  • the distance from the second through hole 310 to the third adapter part may be equal or unequal, preferably equal.
  • the center point of the second through hole 310 is the center point of the first adapter portion 311 .
  • the projection of the first adapter portion 311 perpendicular to the axial direction of the second through hole 310 is a substantially regular quadrilateral, and the first adapter portion 311 has opposite first sides and The third side, as well as the opposite second and fourth sides, the direction from the first side to the third side, and the direction from the second side to the fourth side are all perpendicular to the axial direction of the second through hole 310 , and the direction from the first side to The direction of the third side and the direction from the second side to the fourth side may be perpendicular to each other, and the distance from the second through hole 310 to the first side of the first adapter part 311 is substantially equal to the distance from the second through hole 310 to the first adapter part.
  • the distance from the third side of the second through hole 311 to the second side of the first adapter portion 311 is substantially equal to the distance from the second through hole 310 to the fourth side of the first adapter portion 311 .
  • the second adapter portion 312 is connected to the first side of the first adapter portion 311
  • the third adapter portion 313 is connected to the third side of the first adapter portion 311 .
  • the second adapter part 312 may be located on the side of the first adapter part 311 facing the fifth side plate 15
  • the third adapter part 313 may be located on the side of the first adapter part 311 facing the sixth side plate 16 .
  • the axial direction of the first through hole 100 is the same as the thickness direction of the first side plate 11
  • the axial direction of the second through hole 310 is the same as the thickness direction of the first adapter portion 311 .
  • the side of the first adapter 31 that is connected to the first connecting piece 51 is the connection between the second adapter 312 and the first connecting piece 31 .
  • the side of the first connecting piece 51 and the side of the first adapter 31 and the first side plate 11 are the first adapter portion 311 The side in contact with the first side plate 11 (the side of the first adapter portion 311 facing the first side plate 11 ).
  • the first connecting piece 51 and the second adapter part 312 may be welded, and when the first connecting piece 51 is away from the second A solder mark is formed on one side of the adapter portion 312 .
  • the first connecting piece 51 includes the above-mentioned first connecting part 511 and the second connecting part 512
  • the first connecting part 511 and the second connecting part 312 may be welded, and when the first connecting part 511 is away from the second connecting part 312, A solder mark is formed on one side of the connecting portion 312 .
  • the projection of the second adapter portion 312 in the thickness direction of the battery core 2 and the projection of the first connecting piece 51 in the thickness direction of the battery core 2 have an overlapping area, and the welding area between the two is located in the overlapping area.
  • the projection of the first adapter 31 on the first side plate 11 does not overlap with the projection of the first tab 21 on the first side plate 11 (that is, the first adapter 31 is parallel to the first side plate 11 ).
  • the projection of the extension direction of the side plate 11 does not overlap with the projection of the first tab 21 parallel to the extension direction of the first side plate 11 ).
  • the first tab 21 and the first adapter 31 are not along the direction of the battery core 2 distribution in the direction to the first side plate 11 , specifically, in the direction from the first side plate 11 to the battery core 2 , the distance from the first side plate 11 to the battery core 2 is a 1 , and the first tab 21 is The distance from the side where the battery cores 2 are connected to the side of the first tab 21 facing away from the battery core 2 (that is, the side facing the first side plate 11 ) is b 1 , and the first adapter 31 faces the side of the battery core 2
  • One side (that is, the side away from the first side plate 11 ) to the side of the first adapter 31 facing the first side plate 11 (that is, the first adapter 31 is along the first side plate 11 to the battery core 2 direction) is c 1 , a 1 ⁇ b 1 +c 1 , therefore, compared with the way the tabs and adapters are arranged along the length direction of the housing, the technical solution of this embodiment can make the electrical The space between the core and the
  • the housing 1 includes a second side plate 12 connected to the first side plate 11 .
  • the projection of the first adapter 31 on the second side plate 12 is the same as the projection of the first tab 21 on the second side plate 12 .
  • the projections at least partially overlap (that is, the projection of the first adapter 31 perpendicular to the extension direction of the first side plate 11 at least partially overlaps with the projection of the first tab 21 perpendicular to the extension direction of the first side plate 11 ), that is, the first The adapter 31 and the first tab 21 are distributed along the extension direction of the first side plate 11 , thereby facilitating the connection between the first tab 21 and the first adapter 31 and further saving the cavity space.
  • the surface of the second side plate 12 may be perpendicular to the surface of the first side plate 11
  • the battery core 2 may include a plurality of stacked electrode sheets.
  • the surface of the second side plate 12 may be perpendicular to the surface of the electrode sheets (with the (the thickness direction of the electrode sheet is parallel), and the surface of the first side plate 11 is perpendicular to the surface of the electrode sheet.
  • the projection of the first adapter 31 perpendicular to the width direction of the battery core 2 is at least partially the same as the projection of the first tab 21 perpendicular to the width direction of the battery core 2 . Overlapping, that is, the first adapter 31 and the first tab 21 are distributed along the width direction of the battery core 2 .
  • the extension direction of the first side plate 11 is parallel to the surface of the first side plate 11 , and the direction from the first side plate 11 to the battery core 2 can be parallel to the length direction of the housing 1 . It may be the width direction of the housing 1 or the thickness direction of the housing 1 . For example, as shown in FIGS. 1 to 5 , the extending direction of the first side plate 11 is the width direction of the housing 1 .
  • the length direction of the housing 1 is also the length direction of the battery core 2
  • the width direction of the housing 1 is also the width direction of the battery core 2
  • the thickness direction of the housing 1 is also the thickness direction of the battery core 2.
  • the battery core 2 may include a plurality of stacked electrode sheets, and the electrode sheets are stacked along the thickness direction of the battery core 2 , that is, the thickness direction of the battery core 2 is also the thickness direction of the electrode sheets.
  • the first connecting piece 51 (or the first connecting portion 511 of the first connecting piece 51 ) is away from the first adapter.
  • 31/A sixth insulation layer 86 is also provided on one side of the second adapter portion 312 .
  • the battery may further include a third insulating layer 83 located between the first coupling member 5 and the first side plate 11 .
  • the third insulating layer 83 may include a first portion located on a side of the fourth connecting piece 54 facing away from the first tab 21 .
  • the battery core 2 includes a plurality of stacked electrode sheets.
  • the battery core 2 has a first surface and a second surface that are oppositely arranged.
  • the third insulating layer 83 also includes a first portion close to the battery core 2 from the first portion.
  • a second part is formed from one end of the second surface extending in a direction close to the battery core 2 and a third part is formed in a direction extending from an end of the first part close to the second surface of the battery core 2 in a direction close to the battery core 2 .
  • the second part, the first part and the third part of the third insulating layer 83 are connected in sequence and surrounded by a first groove, and the bottom wall of the first groove is the third part.
  • the first part and side walls of the insulating layer 83 are respectively the second part and the third part of the third insulating layer 83, the first tab 21, and the part where the first connecting member is connected to the first tab 21 (such as the fourth
  • the connecting piece 54 and the second connecting portion 512 of the first connecting piece 51 located on the side of the first tab 21 are located in the first groove and are covered by the third insulating layer 83 to avoid the first tab 21 or the first connecting piece.
  • 51 is in contact with the case, and at the same time protects the first tab 21 and the first connecting member, preventing the first tab 21 and the first linking member from colliding with the case during the battery drop process. Therefore, the battery can Further improve battery performance such as stability and safety.
  • the first tab 21 has an opposite first side and a second side.
  • the first side of the first tab 21 and the second side of the first tab 21 are respectively located between the first tab 21 and the fourth connection.
  • the opposite sides of the side where the sheets 54 are connected that is, the side of the first tab 21 facing away from the battery core 2).
  • the third insulating layer 83 includes The first part located on the side of the fourth connecting piece 54 facing away from the first tab 21, the second part located on the first side of the first tab 21, and the third part located on the second side of the first tab 21; when the When the first connecting piece 51 of a coupling member includes a first connecting part 511 and a second connecting part 512 (as shown in FIG.
  • the layer 83 includes a first portion located on a side of the fourth connecting piece 54 facing away from the first tab 21 , a second portion located on a side of the second connecting portion 512 facing away from the first tab 21 , and a second portion located on a side of the first tab 21 facing away from the second connection.
  • the third part of one side (the second side) of the part 512 is located on a side of the fourth connecting piece 54 facing away from the first tab 21 , a second portion located on a side of the second connecting portion 512 facing away from the first tab 21 , and a second portion located on a side of the first tab 21 facing away from the second connection.
  • the projection of the first tab 21 in the thickness direction of the battery core 2 is located within the projection of the second part of the third insulating layer 83 in the thickness direction of the battery core 2 , and the first tab 21 is in the thickness direction of the battery core 2 .
  • the projection in the thickness direction of the core 2 is located within the projection of the third part of the third insulating layer 83 in the thickness direction of the battery core 2 , and the projection of the first tab 21 in the length direction of the battery core 2 is located in the third insulating layer.
  • the first part of 83 is within the projection in the length direction of the battery core 2 , that is, the third insulating layer 83 completely covers the first tab 21 and the part where the first connecting member is connected to the first tab 21 .
  • the direction from the second part to the first tab 21, the direction from the third part to the first tab 21, the direction from the second part to the third part, and the thickness direction of the battery core 2 can be parallel, and the direction from the first part to the first The direction of the tabs 21 is parallel to the length direction of the battery core 2 .
  • the second part of the third insulating layer 83 extends to the first side of the battery core 2 and is bonded to the electrode sheet located on the first side of the battery core 2 (the electrode sheet close to the housing 1),
  • the third part of the third insulating layer 83 extends to the second surface of the battery core 2 and is bonded to the electrode sheet located on the second surface of the battery core 2 (the electrode sheet close to the case 1), whereby,
  • the third insulating layer 83 wraps the side of the battery core 2 to further improve the stability of the battery core 2 .
  • a second insulating layer 82 can also be provided between the first adapter 31 and the battery core 2 to prevent the first adapter 31 from contacting the electrode sheets with opposite polarities in the battery core 2 . Contact short circuit. Specifically, when the first adapter 31 has the second connecting piece 52 , the second insulating layer 82 is located between the second connecting piece 52 and the battery core 2 .
  • the second insulating layer 82 extends to the first side of the battery core 2 and is bonded to the electrode sheet located on the first side of the battery core 2 .
  • the second insulating layer 82 Extends to the second surface of the battery core 2 and is bonded to the electrode sheet located on the second surface of the battery core 2. In this way, the second insulating layer 82 wraps around the side of the battery core 2, and can also fix the battery core 2 and improve the battery core. 2 stability.
  • the battery core 2 includes a plurality of stacked electrode sheets, the electrode sheets include a first electrode sheet, the first electrode sheet includes a first current collector, and the first tab 21 is disposed on the first current collector; along In the direction from the first adapter 31 to the battery core 2, the distance between the first adapter 31 and the first current collector is less than 1 mm. That is, the distance between the first adapter 31 and the first current collector is from the first adapter 31 to the first current collector. The distance in the direction from the component 31 to the battery core 2 is less than 1 mm, thereby further shortening the space occupied by the first adapter 31 and the first tab 21, improving the space utilization of the cavity, and expanding the occupied area of the electrode sheet. Enhance the energy density of the battery core.
  • the distance from the side of the first tab 21 away from the battery core 2 to the side where the first tab 21 is connected to the battery core 2 is no longer than the distance between the first adapter 31 and the first side plate 11 along the first side plate 11 .
  • the length of the first tab 21 (that is, the length of the first adapter 31 in the direction along the first side plate 11 to the first tab 21 ), that is, increasing the length of the first adapter 31 on the second side)
  • the overlap area between the projection on the plate 12 and the projection of the first tab 21 on the second side plate 12 is thus achieved to protect the first tab 21 in the width direction of the battery core and prevent the first tab 21 from being inserted into the battery. It will fall off during a drop or collision. At the same time, it can further expand the area of the electrode sheet of the battery core, which will help further improve battery energy density and other performance.
  • the length c1 of the first adapter 31 in the direction from the first side plate 11 to the first tab 21 is 1mm-4mm, such as 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm. , 4mm, etc.
  • the battery core 2 is also provided with a second tab 22, the polarity of the second tab 22 is opposite to that of the first tab 21; the battery also includes a second adapter 32, the second adapter 32 is connected to the second pole The ears 22 are electrically connected, and the second adapter 32 is disposed between the first side plate 11 and the battery core 2.
  • the projection of the second adapter 32 on the first side plate 11 is consistent with the second pole lug 22 on the first side.
  • the projections on the board 11 do not overlap (that is, the projection of the second adapter 32 parallel to the extension direction of the first side panel 11 does not overlap with the projection of the second tab 22 parallel to the extension direction of the first side panel 11 ).
  • the second tabs 22 and the second adapter 32 are not distributed along the direction from the battery core 2 to the first side plate 11.
  • the third The distance from one side plate 11 to the battery core 2 is a 1 , from the side where the second tab 22 is connected to the battery core 2 to the side of the second tab 22 away from the battery core 2 (that is, facing the first side plate 11
  • the distance between one side) is b 2
  • from the side of the second adapter 32 facing the battery core 2 (that is, the side away from the first side plate 11 ) to the side of the second adapter 32 facing the first side plate 11 (That is, the length of the second adapter 32 in the direction along the first side plate 11 to the battery core 2 ) is c 2 , a 1 ⁇ b 2 + c 2 , thus, the cavity space can be further saved and the battery can be improved. energy density and other properties.
  • b 2 and b 1 may be equal or unequal, and c 2 and c 1 may be equal or unequal.
  • first pole tab 21, the second pole tab 22, the first adapter 31, and the second adapter 32 are on the first side plate. None of the projections overlap each other.
  • the projection of the second adapter 32 on the second side plate 12 at least partially overlaps with the projection of the second tab 22 on the second side plate 12 (that is, the second adapter 32
  • the projection perpendicular to the extension direction of the first side plate 11 and the projection of the second tab 22 perpendicular to the extension direction of the first side plate 11 at least partially overlap), that is, the second adapter 32 and the second tab 22 are arranged along the extension direction of the first side plate, specifically in the width direction of the battery core. This facilitates the connection between the second adapter 32 and the second tab 22 , further saves the cavity space, and improves the efficiency of the battery. Battery energy density and other properties.
  • the projection of the first pole 21 on the second side plate 12 at least partially overlaps with the projection of the second pole 22 on the second side plate 12 (that is, the extension of the first pole 21 perpendicular to the first side plate 11
  • the projection of the second tab 22 perpendicular to the extension direction of the first side plate 11 at least partially overlaps).
  • the projection of the first adapter 31 on the second side panel 12 and the projection of the second adapter 32 on the second side panel 12 at least partially overlap.
  • the projection of the first tab 21 perpendicular to the width direction of the battery core 2 at least partially overlaps with the projection of the second tab 22 perpendicular to the width direction of the battery core 2, and the second rotation
  • the projection of the connector 32 perpendicular to the width direction of the battery core 2 at least partially overlaps with the projection of the second tab 22 perpendicular to the width direction of the battery core 2 .
  • first pole tab 21 and the second pole tab 22 may be located between the first adapter part 31 and the second adapter part 32, thereby fully utilizing the space between the first adapter part 31 and the second adapter part 32. space to further expand the size of the electrode sheet of the battery core 2 in the length direction to increase the energy density of the battery core.
  • first tab 21 and the second tab 22 are located between the first adapter 31 and the second adapter 32 , that is, The first adapter 31 , the first tab 21 , the second tab 22 , and the second adapter 32 can be arranged in sequence.
  • first adapter 31 , the first tab 21 , and the second tab 22 can be arranged sequentially in the width direction of the battery core 2, and the first adapter 31, the first tab 21, the second tab 22, and the second adapter 32 can be basically coaxially arranged. .
  • first adapter 31 and the second adapter 32 may be located between the first pole 21 and the second pole 22 .
  • first adapter 31, the first tab 21, the second tab 22, and the second adapter 32 generally do not protrude from the end surface of the battery core 2 (the end surface of the battery core 2 facing the first side plate 11).
  • the edge of the battery core 2 does not protrude from the outer edge of the battery core 2 in either the thickness direction or the width direction, that is, the projection of the battery core 2 on the first side plate 11 covers the first adapter 31 on the first side plate 11
  • the projection of the battery core 2 on the first side plate 11 covers the projection of the first tab 21 on the first side plate 11
  • the projection of the battery core 2 on the first side plate 11 covers the second tab 22
  • the projection of the battery core 2 on the first side plate 11 covers the projection of the second adapter 32 on the first side plate 11 .
  • the above-mentioned battery also includes an external connecting piece 41 disposed on the side of the first side plate 11 of the housing 1 facing away from the cavity.
  • the external connecting piece 41 includes an outwardly protruding pole 42 .
  • the column 42 penetrates the first side plate 11 and is connected to the second adapter.
  • the pole posts 42 are generally formed to protrude outward along the thickness direction of the external connection piece 41 , that is, the axial direction of the pole posts 42 is parallel to the thickness direction of the external connection piece 41 .
  • the first side plate 11 is provided with a fifth through hole 110 corresponding to the pole 42 , and the pole 42 passes through the fifth through hole 110 to penetrate the first side plate 11 and be connected to the second adapter 32 .
  • the second adapter 32 includes a third through hole 320 corresponding to the pole 42.
  • the pole 42 penetrates the first side plate 11 and is connected to the second adapter 32 through the third through hole 320.
  • the fifth through hole 110 and the third through hole 320 may be coaxially disposed.
  • the cross section of the pole 42 perpendicular to the axial direction of the pole 42 is circular.
  • the pole 2 can be cylindrical; or, as shown in Figure 13, the pole has a tapered structure. , that is, along the direction away from the external connecting piece 41 (the direction from the first side plate 11 to the second adapter 32 ), the diameter of the pole 42 shows an increasing or decreasing trend, and the diameter of the pole 42 is the pole 42 The diameter of the cross section perpendicular to the axis of pole 42 .
  • the diameter of the pole 42 shows a changing trend (i.e., increases or decreases) along the direction from the first side plate 11 to the second adapter 32 , and this change It can be a gradual change, that is, a uniform increase or decrease with essentially the same amplitude.
  • the aperture (diameter) of the fifth through hole 110 and the third through hole 320 changes correspondingly with the diameter of the pole post 42 .
  • the diameter of the pole post 42 gradually changes.
  • the diameters of the fifth through hole 110 and the third through hole 320 also gradually increase; along the direction from the first side plate 11 to the second adapter 32 , the diameter of the pole post 42 gradually decreases, so At this time, the diameters of the fifth through hole 110 and the third through hole 320 also gradually decrease.
  • the third through hole 320 of the second adapter 32 includes a first hole section and a second hole section connected to each other, and the second hole section is located in the first hole section.
  • an end of the pole post 42 close to the battery core 2 extends outward to form an extension 43 corresponding to the second hole section.
  • first hole section and the second hole section can be arranged coaxially, the first hole section and the second hole section are both circular through holes, and the diameter of the second hole section is larger than that of the first hole section and the second hole section.
  • the diameter of one end of the connection preferably, the diameter of the second hole segment is larger than the diameter of the first hole segment, and the axial projection of the second hole segment perpendicular to the third through hole 320 can cover the first hole segment perpendicular to the third through hole 320.
  • Axial projection of hole 320 Axial projection of hole 320.
  • the cross-sectional area of the external piece 41 perpendicular to the axial direction of the pole 42 can be larger than the cross-sectional area of the pole 42 perpendicular to the axial direction of the pole 42 , and the projection of the external piece 41 perpendicular to the axial direction of the pole 42 covers the pole.
  • the projection of the pole 42 perpendicular to the axial direction of the pole 42, the cross-sectional area of the extension 43 perpendicular to the pole 42 is larger than the cross-sectional area of the pole 42 perpendicular to the axial direction of the pole 42, the extension 43 is perpendicular to the pole 42
  • the axial projection covers the axial projection of the pole 42 perpendicular to the pole 42
  • the cross-sectional area of the external piece 41 perpendicular to the axial direction of the pole 42 is larger than the cross-sectional area of the extension 43 perpendicular to the axial direction of the pole 42
  • the projection of the external piece 41 perpendicular to the axial direction of the pole 42 covers the projection of the extension 43 perpendicular to the axial direction of the pole 42
  • the cross-sectional area of the extension 43 perpendicular to the axial direction of the pole 42 is substantially equal to the second hole section With a cross-sectional area perpendicular to the axial direction of the pole 42, the extension 43 is engaged
  • the end surface of the pole 42 close to the battery core 2 can be flush with the surface of the second adapter 32 close to the battery core 2, which not only ensures that the pole 42 and the second adapter are The bonding strength is 32, and the pole post 42 is prevented from interfering with the connection between the second pole lug 22 or the fifth connecting piece 55 and the second adapter 32 .
  • the thickness of the extension portion 43 along the axial direction of the third through hole 320 (also the axial direction of the pole 42 ) is substantially equal to the depth of the second hole segment along the axial direction of the third through hole 320 , whereby the extension portion 43 is snapped into the second hole section, and the end surface of the extension 43 close to the battery core 2 is flush with the surface of the second adapter 32 facing the battery core 2 .
  • one end of the pole 42 close to the battery core 2 can also extend out of the third through hole 320 and extend along the perimeter of the third through hole 320 .
  • An extension portion 43 is formed extending outwardly to be in contact with the side surface of the second adapter 32 close to the battery core 2, that is, the end surface of the pole 42 close to the battery core 2 does not face the battery core with the second adapter 32.
  • One side surface of 2 is flush, but is located between the second adapter 32 and the battery core 2 .
  • the epitaxial sheet, pole post 42, and epitaxial portion 43 can be integrally formed, and they can be made of metal.
  • the second adapter 32 and the first side plate 11 can be riveted through rivets. After riveting, the rivets
  • An external piece 41 is formed on one end of the first side plate 11 away from the cavity, an extension 43 is formed on the other end, and a pole 42 is formed between the two ends.
  • the formed pole 42 is, for example, a tapered structure.
  • the second tab 22 is insulated from the case 1 , and specifically the insulation can be performed by providing an insulating sheet (insulating layer).
  • a first insulating sheet 6 is disposed between the external sheet 41 and the first side plate 11
  • the second adapter 32 is connected to the first side panel 11 .
  • There is also a second insulating sheet 7 between the side plates 11 that is, the external connecting sheet 41 , the first insulating sheet 6 , the first side plate 11 , the second insulating sheet 7 , and the second adapter 32 are stacked in sequence.
  • the pole posts 42 Penetrating the first insulating sheet 6 and the second insulating sheet 7; a first insulating layer 81 is provided between the pole 42 and the first side plate 11, whereby the external connecting piece 41, the pole 42, and the second adapter 32 It is electrically connected to the second tab 22 and insulatedly connected to the first side plate 11 (casing 1).
  • the difference between the diameter of the third through hole 320 and the diameter of the pole 42 is substantially equal to the width of the first insulating layer 81 along the circumferential direction of the third through hole 320 .
  • the circumferential direction of the hole 320 is perpendicular to the axial direction of the third through hole 320 .
  • the first insulating layer 81 can be integrally formed with the first insulating sheet 6 , and the first insulating layer 81 protrudes outward from the side of the first insulating sheet 6 close to the first side plate 11 (into the second through hole 110 protrusions); or the first insulating layer 81 can be integrally formed with the second insulating sheet 7, and the first insulating layer 81 protrudes outward from the side of the second insulating sheet 7 close to the first side plate 11 (toward the second through hole). Protrusions in the hole 110) are formed.
  • the first insulating sheet 6 is provided with a sixth through hole 60, and the pole post 42 passes through the sixth through hole 60 to penetrate the first insulating sheet 6; the second insulating sheet 7 is provided with a fourth through hole 70, The pole post 42 passes through the fourth through hole 70 to penetrate the second insulating sheet 7 .
  • the pole 42 passes through the sixth through hole 60 , the fifth through hole 110 , the fourth through hole 70 , and the third through hole 320 in order to achieve connection with the second adapter 32 .
  • the sixth through hole 60 , the fifth through hole 110 , the fourth through hole 70 and the third through hole 320 may be coaxially arranged.
  • the projection of the first insulating sheet 6 on the first side panel 11 can cover the projection of the external sheet 41 on the first side panel 11 (that is, the projection of the external sheet 41 on the first side panel 11
  • the projection on the side panel 11 is within the projection of the first insulating sheet 6 on the first side panel 11), thereby preventing the external sheet 41 from contacting the housing 1 and ensuring the insulation of the housing.
  • the projection of the second insulating sheet 7 on the first side plate 11 can cover the projection of the second adapter 32 on the first side plate 11 (that is, the projection of the second adapter 32 on the first side plate 11 Projected within the projection of the second insulating sheet 7 on the first side plate 11 ), thereby preventing the second adapter 32 from contacting the housing 1 and ensuring the insulation of the housing.
  • battery performance such as safety and stability can be further improved.
  • the housing 1 also includes a sixth side plate 16 connected to the first side plate 11.
  • the second insulating sheet 7 can be an L-shaped structure, which includes a connected first insulating part 71 and a third insulating part 71.
  • Two insulating parts 72, the first insulating part 71 is located between the second adapter 32 and the first side plate 11, and the pole 42 penetrates the first insulating part 71 (the first insulating part 71 is provided with The fourth through hole 70) provided correspondingly to the pole 42, the second insulating portion 72 is located between the second adapter 32 and the sixth side plate 16. Therefore, through the second insulating portion 72, a second adapter can be formed.
  • the member 32 provides support and support, and can insulate the second adapter member 32 from the sixth side plate 16 of the housing 1 to improve the safety and stability of the battery.
  • the projection of the first insulating part 71 on the first side plate 11 can cover the projection of the second adapter 32 on the first side plate 11 (that is, the projection of the second adapter 32 on the first side plate 11 (in the projection of the first insulating part 71 on the first side plate 11 ), the projection of the second insulating part 72 on the sixth side plate 16 can cover the projection of the second adapter 32 on the sixth side plate 16 Projection (that is, the projection of the second adapter 32 on the sixth side plate 16 is within the projection of the second insulating portion 72 on the sixth side plate 16 ) to prevent the second adapter 32 from contacting the first side plate 11 Or the sixth side plate 16 contacts.
  • an included angle is formed between the surface of the first insulating part 71 and the second adapter 32 and the surface of the second insulating part 72 and the second adapter 32.
  • the range of the included angle is, for example, 80° ° ⁇ 120°, such as 80°, 90°, 100°, 110°, 120°, etc.
  • the surface of the sixth side plate 16 is parallel to the surface of the electrode sheet; the surface of the sixth side plate 16 and the first side plate 11 are not parallel, for example, perpendicular; the surface of the sixth side plate 16 and the second side plate 12 are not parallel, for example Vertical; the sixth side plate 16 may be, for example, a bottom side plate (or bottom plate).
  • the distance from the side of the second tab 22 away from the battery core 2 to the side of the second tab 22 connected to the battery core 2 is no greater than the distance between the second adapter 32 and the side along the first side plate 11
  • the length in the direction to the second tab 22 is conducive to further improving the energy density and other performance of the battery.
  • the second adapter 32 may be block-shaped (or called a second adapter block), and its thickness direction may be parallel to the direction from the first side plate 11 to the second tab 22 , that is, the second adapter
  • the length 32 in the direction from the first side plate 11 to the second tab 22 is the thickness of the second adapter 32 .
  • the direction from the first side plate 11 to the first tab 21 , the direction from the first side plate 11 to the second tab 22 , and the direction from the first side plate 11 to the battery core 2 are parallel.
  • the length c 2 of the second adapter 32 in the direction from the first side plate 11 to the second tab 22 is 1 mm to 3 mm, such as 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc.
  • the first tab 21 is electrically connected to the case 1, and the second tab 22 is insulatedly connected to the case 1.
  • the second insulating sheet 7 does not need to be provided between the first adapter 31 and the first side plate 11. or direct contact, such as welding, and the second insulating sheet 7 can be disposed between the second adapter 32 and the first side plate 11, c 2 ⁇ c 1 , and the difference in thickness between the two (c 1 -c 2 ) can be Basically equal to the thickness of the second insulating sheet 7 .
  • the above-mentioned battery may also include a second coupling member 5' located between the battery core 2 and the first side plate 11.
  • the second coupling member 5' is respectively connected to the second tab 22 and the second adapter 32 (i.e., the second The adapter 32 is connected to the second pole lug 22 through the second coupling part 5').
  • the second adapter 32, the second coupling part 5', and the second pole lug 22 may be welded in sequence.
  • the second connecting member 5 ′ may include a fifth connecting piece 55 connected to the second adapter 32 and an eighth connecting piece 58 connected to the side of the second tab 22 away from the battery core 2 .
  • the second connecting piece 5' may have a bent structure
  • the fifth connecting piece 55 is connected to the second adapter 32
  • the eighth connecting piece 58 is connected to the second connecting piece 32.
  • the pole tabs 22 are connected, specifically by welding.
  • a third clamp is formed between the side of the second adapter 32 that is connected to the fifth connecting piece 55 and the side that is connected to the eighth connecting piece 58 and the second pole tab 22 .
  • the range of the third included angle is 80-120°, for example Such as 80°, 90°, 100°, 110°, 120°, that is, the two are not parallel, for example, they can be perpendicular. This can further improve the connection between the second adapter 32 and the second tab through the second coupling part 5'. 22 connection stability, thereby improving the stability, safety and service life of the battery.
  • a fourth included angle is formed between the side of the second adapter 32 that is connected to the fifth connecting piece 55 and the side of the second adapter 32 facing the first side plate 11 , and the range of the fourth included angle is 80° -120°, such as 80°, 90°, 100°, 110°, 120°, that is, the two are not parallel, for example, they can be perpendicular.
  • the battery core 2 includes a plurality of stacked electrode sheets, and the side of the fifth connecting piece 55 that is in contact with the second adapter 32 is parallel to the surface of the electrode sheets.
  • the second coupling member 5' further includes a second connection component connected to the fifth connecting piece 55 and the eighth connecting piece 58 respectively, and the second connecting component includes a third connecting piece.
  • the sixth connecting piece 56 is located between the second adapter 32 and the battery core 2; in the direction from the second adapter 32 to the second tab 22, the seventh connecting piece 56 is located between the second adapter 32 and the battery core 2;
  • the connecting piece 57 is located between the second adapter 32 and the second tab 22; the fifth connecting piece 55, the sixth connecting piece 56, the seventh connecting piece 57, and the eighth connecting piece 58 are connected in sequence.
  • the second coupling member 5' has a multi-bent structure, and its fifth connecting piece 55 is connected to the eighth connecting piece 58 through the sixth connecting piece 56 and the seventh connecting piece 57 in turn.
  • the surface of the fifth connecting piece 55 The surface of the sixth connecting piece 56 is not parallel to the surface of the sixth connecting piece 56, for example, perpendicular.
  • the surface of the sixth connecting piece 56 is not parallel to the surface of the seventh connecting piece 57, and may be perpendicular or non-perpendicular.
  • the surface of the eighth connecting piece 58 is not parallel to the surface of the sixth connecting piece 57.
  • the surfaces of 56 can be parallel, thereby further improving the stability of the connection between the second adapter 32 and the second tab 22 .
  • the fifth connecting piece 55 includes a third connecting portion 551 connected with the second adapter 32 and an extension direction along the first side plate 11 (such as from the second adapter 32 ).
  • the fourth connecting portion 552 extends from the adapter 32 to the direction of the second pole lug 22 .
  • the fourth connecting portion 552 is connected to the eighth connecting piece 58 .
  • the third connection part 551 and the fourth connection part 552 are located on the same side of the second adapter 32 and on the same side of the second tab 22 .
  • the third connection part 551 may be located away from the second adapter 32
  • the fourth connecting portion 552 can be specifically located on the side of the second tab 22 facing away from the sixth side plate 16 , and the fourth connecting portion 552 faces the side of the second tab 22 and the eighth connecting piece.
  • the side of 58 that is connected to the second pole lug 22 is not parallel, for example, vertical.
  • the third connecting part 551 and the fourth connecting part 552 can be integrally formed to form the fifth connecting piece 55.
  • the surfaces of the third connecting part 551 and the fourth connecting part 552 can be flush, that is, the fifth connecting piece 55 can be A straight structure without a large degree of bending, but is not limited to this.
  • the surface of the fifth connecting piece 55 and the surface of the eighth connecting piece 58 are not parallel, for example, perpendicular, that is, the surface of the fifth connecting piece 55 and the second adapter 32 is connected to the surface of the eighth connecting piece 58 and the second tab 22
  • the connecting sides are not parallel, such as perpendicular.
  • the fifth connecting piece 55 and the second adapter 32 may be welded, and a welding mark is formed on the side of the fifth connecting piece 55 away from the second adapter 32 .
  • the fifth connecting piece 55 includes the third connecting part 551 and the fourth connecting part 552
  • the third connecting part 551 and the second adapter 32 may be welded, and the third connecting part 551 is away from the second adapter.
  • One side of the piece 32 is formed with a weld mark. Specifically, there is an overlapping area between the projection of the second adapter 32 in the thickness direction of the battery core 2 and the projection of the fifth connecting piece 55 in the thickness direction of the battery core 2, and the welding area of the two is located in this overlapping area.
  • a sixth insulating layer 86 is provided on the side of the fifth connecting piece 55 (or the third connecting portion 551 of the fifth connecting piece 55) away from the second adapter 32. As shown in FIG. 1, the sixth insulating layer 86 may extend from the first connecting piece 51 to the fifth connecting piece 55. Specifically, it may extend from an end of the first connecting piece 51 facing away from the fifth connecting piece 55 to an end of the fifth connecting piece 55 facing away from the first connecting piece 51, covering The first connecting piece 51 and the fifth connecting piece 55 .
  • a fourth insulating layer 84 may also be included, and the fourth insulating layer 84 is located between the second coupling member 5' and the first side plate 11.
  • the fourth insulating layer 84 may include a fourth portion located on a side of the eighth connecting piece 58 facing away from the second tab 22 .
  • the fourth insulating layer 84 further includes a fifth portion extending from an end of the fourth portion close to the first surface of the battery core 2 in a direction close to the battery core 2 and a third portion formed from the fourth portion close to the battery core 2 .
  • a sixth part is formed by extending one end of the second surface in a direction close to the battery core 2 .
  • the fifth part, the fourth part and the sixth part of the fourth insulating layer 84 are connected in sequence and surrounded to form a second groove.
  • the bottom wall of the second groove is the third part.
  • the fourth part and side walls of the fourth insulating layer 84 are respectively the fifth part and the sixth part of the fourth insulating layer 84 , the second tab 22 , and the part where the second connecting member 5 ′ is connected to the second tab 22 (For example, the eighth connecting piece 58 and the fifth connecting piece 55 are located on the fourth connecting portion 552 on the side of the second tab 22) located in the second groove and covered by the fourth insulating layer 84, thereby further improving the battery performance. performance such as stability and security.
  • the second tab 22 has an opposite first side and a second side.
  • the first side of the second tab 22 and the second side of the second tab 22 are respectively located between the second tab 22 and the eighth connection. Opposite sides of the side where the pieces 58 meet.
  • the fourth insulating layer 84 includes The fourth part of the side of the connecting piece 58 facing away from the second tab 22, the fifth part located on the first side of the second tab 22, and the sixth part located on the second side of the second tab 22; when the second connection
  • the fifth connecting piece 55 of the component 5' includes a third connecting part 551 and a fourth connecting part 552
  • the fourth connecting part 552 extends to the first side of the second tab 22, and the fourth insulating layer 84 includes a third connecting part 551 located on the eighth connecting part 552.
  • the projection of the second tab 22 in the thickness direction of the battery core 2 is located within the projection of the fifth part of the fourth insulating layer 84 in the thickness direction of the battery core 2 , and the second tab 22 is in the thickness direction of the battery core 2 .
  • the projection of the sixth part of the fourth insulating layer 84 in the thickness direction of the core 2 is located within the projection of the sixth part of the fourth insulating layer 84 in the thickness direction of the core 2 .
  • the projection of the second tab 22 in the length direction of the battery core 2 is located in the fourth insulating layer.
  • the fourth part of 84 is within the projection in the length direction of the battery core 2 , that is, the fourth insulating layer 84 completely covers the second tab 22 and the part where the second connecting member 5 ′ is connected to the second tab 22 .
  • the direction from the fifth part to the second tab 22, the direction from the sixth part to the second tab 22, the direction from the fifth part to the sixth part, and the thickness direction of the battery core 2 can be parallel, and the direction from the fourth part to the second tab 22 can be parallel.
  • the direction of the diode tabs 22 is parallel to the length direction of the battery core 2 .
  • the fifth portion of the fourth insulating layer 84 extends to the first side of the battery core 2 and is bonded to the electrode sheet located on the first side of the battery core 2
  • the sixth portion of the fourth insulating layer 84 Extends to the second side of battery core 2 and is located at The electrode sheets on the second side of the battery core 2 are bonded, so that the fourth insulating layer 84 wraps around the side of the battery core 2 , which can further improve the stability of the battery core 2 .
  • a fifth insulating layer 85 may be disposed between the second adapter 32 and the battery core 2 to prevent the second adapter 32 from contacting the opposite polarity electrode sheets in the battery core 2 . Contact short circuit. Specifically, when the second adapter 32 has the sixth connecting piece 56, the fifth insulating layer 85 is located between the sixth connecting piece 56 of the second connecting piece 5' and the battery core 2.
  • the fifth insulating layer 85 extends to the first side of the battery core 2 and is bonded to the electrode sheet located on the first side of the battery core 2 , and the fifth insulating layer 85 extends to the second side of the battery core 2 And it is bonded to the electrode sheet located on the second side of the battery core 2. In this way, the fifth insulating layer 85 wraps around the side of the battery core 2, and can also fix the battery core 2 and improve the stability of the battery core 2.
  • the battery core 2 includes a plurality of stacked electrode sheets, the electrode sheets include a second electrode sheet, the second electrode sheet includes a second current collector, and the second tab 22 is disposed on the second current collector; along In the direction from the second adapter 32 to the battery core 2, the distance between the second adapter 32 and the second current collector is less than 1 mm. That is, the distance between the second adapter 32 and the second current collector is along the second adapter. The distance in the direction from the component 32 to the battery core 2 is less than 1 mm.
  • the direction from the second adapter 32 to the battery core 2, the direction from the first adapter 31 to the battery core 2, and the direction from the first side plate 11 to the battery core 2 are parallel.
  • the battery core 2 has a side surface located between the first surface of the battery core 2 and the second surface of the battery core 2 .
  • a protective adhesive layer 9 is provided on at least part of at least one side of the battery core 2 . .
  • the side of the battery core 2 is the side that exposes the outer edge of the electrode sheet in the battery core 2, and is formed by the end surfaces of a plurality of stacked electrode sheets perpendicular to the thickness direction thereof, that is, the side of the battery core 2 is parallel to the battery core. 2 thickness direction (also the thickness direction of the electrode sheet).
  • the side of the battery core 2 includes a first side, a second side, a third side, and a fourth side that are connected in sequence.
  • the first side is the end surface of the battery core 2 facing the first side plate 11 (that is, the battery core 2 is provided with a first side).
  • one side of the pole lug 21 and the second pole lug 22), the second side and the fourth side are located on opposite sides of the first side (or the third side), and the first side and the third side are located on the second side (or the fourth side). opposite sides).
  • first side and the third side can be parallel to each other
  • second side and the fourth side can be parallel to each other
  • first side (or third side) and the second side (or fourth side) can be perpendicular to each other
  • first side (or third side) and the second side (or fourth side) can be perpendicular to each other
  • first side The direction to the third side may be the length direction of the battery core 2
  • the second side to the fourth side may be the width direction of the battery core 2
  • the direction from the first side to the third side may also be the width of the battery core 2 direction
  • the second side to the fourth side are the length direction of the battery core 2 .
  • At least one of the second side, the third side and the fourth side is provided with a protective glue layer 9, that is, one or more (such as all) of them is provided with a protective glue layer 9, but is not limited to this.
  • a protective adhesive layer 9 can also be provided on the first side.
  • the number of the protective glue layers 9 on any side of the battery core 2 may be one or more.
  • the protective glue layers 9 on the side along the The length in the longitudinal direction may not be greater than the length of the side, for example, it is substantially equal; when the number of protective glue layers on any side is multiple, the plurality of protective glue layers 9 are arranged at intervals on the side of the battery core 2, so that There is a gap between any two adjacent protective adhesive layers 9, through which the electrolyte is facilitated to infiltrate into the pole pieces in the battery core, thereby further optimizing the battery performance.
  • the length of the protective glue layer 9 in the length direction of the second side may not be greater than the length of the second side, for example, the length of the second side.
  • the lengths of the side surfaces are substantially equal; when there are multiple protective adhesive layers 9 on the second side, the multiple protective adhesive layers 9 can be distributed at intervals on the second side.
  • the protective adhesive layer 9 extends to the first side of the battery core 2 and is bonded to the electrode sheet located on the first side of the battery core 2 and/or extends to the third side of the battery core 2 . Both sides are bonded to the electrode sheet located on the second side of the battery core 2. This prevents the electrode sheet exposed on the side of the battery core 2 from contacting the case 1, and at the same time, the battery core 2 can be fixed, improving the safety and safety of the battery. Stability and other properties.
  • the protective glue layer 9 may be provided with one or more seventh through holes 90 , preferably multiple seventh through holes 90 , and the plurality of seventh through holes 90 may be evenly or unevenly distributed.
  • the electrolyte can be increased through the seventh through hole 90
  • the wettability of the battery core 2 enables the electrolyte to better infiltrate into the electrode sheet, further optimizing the battery performance.
  • the protective glue layer 9 on this side may be provided with one or more seventh through holes 90 .
  • the above-mentioned protective adhesive layer 9 can specifically be adhesive paper, which generally has insulation and viscosity. It can be conventional adhesive paper in this field, and is not particularly limited.
  • the first adapter 31 , the first tab 21 , the second tab 22 , and the second adapter 32 are located on the end surface of the battery core 2 facing the first side plate 11 .
  • the second surfaces are respectively located on opposite sides of the end surface of the battery core 2 facing the first side plate 11 .
  • the direction from the first surface of the battery core 2 to the second surface of the battery core 2 is the thickness direction of the battery core 2 (also the electrode sheet). thickness direction), the first surface (surface) of the battery core 2, the second surface (surface) of the battery core 2 and the surface of the electrode sheet can be parallel (perpendicular to the thickness direction of the electrode sheet), and the first surface (surface) of the battery core 2 can be parallel to the surface of the electrode sheet.
  • the end surface of one side plate 11 can be vertical.
  • the electrode sheet located on the first side of the battery core 2 and the electrode sheet located on the second side of the battery core 2 are respectively the outermost electrode sheets of the battery core 2 , that is, the remaining electrode sheets are stacked on the battery core 2 between the electrode sheets on the first side and the electrode sheets on the second side of the battery core 2 .
  • the polarity of the electrode sheet located on the first side of the battery core 2 and the polarity of the electrode sheet located on the second side of the battery core 2 may be the same or different. They may be positive electrode sheets or negative electrode sheets, and may be the first electrode sheet or the second electrode sheet. Generally, it is preferred that the electrode sheet located on the first side of the battery core 2 and the electrode sheet located on the second side of the battery core 2 are negative electrode sheets.
  • the battery core 2 includes a plurality of stacked electrode sheets.
  • the electrode sheets include a first electrode sheet and a second electrode sheet, which are separated by a separator.
  • the first electrode sheet and the second electrode sheet have opposite polarities.
  • the first electrode sheet may be a positive electrode sheet or a negative electrode sheet, and accordingly, the second electrode sheet may be a negative electrode sheet or a positive electrode sheet.
  • the end surface of the side of the battery core 2 provided with the tabs (the first tab and the second tab) (that is, the end surface of the side of the battery core 2 facing the first side plate 11 ) is parallel to the thickness direction of the battery core 2 .
  • the electrode sheet in the battery core 2 includes a current collector, and the tabs (first tab 21/second tab 22) are arranged on the current collector (first current collector/second current collector). Specifically, it can be set At the end of the current collector, the end surface of the battery core 2 facing the first side plate 11 is formed by the end surface of a plurality of stacked electrode sheets with tabs (the end surface of the electrode sheet parallel to its thickness direction). .
  • the battery core 2 may include a laminated battery core 2 and/or a wound battery core 2.
  • the wound battery core 2 is formed by stacking a plurality of electrode sheets and then rolling them. Specifically, it is composed of a first electrode sheet, The separator and the second electrode sheet are stacked in sequence and then rolled;
  • the laminated battery core 2 is specifically composed of a first electrode sheet, a separator, and a second electrode sheet that are stacked in sequence.
  • the battery of the present invention may specifically include a lithium ion battery, but is not limited thereto.
  • the housing 1 may include a first side plate 11 , a second side plate 12 , a third side plate 13 , a fourth side plate 14 , a fifth side plate 15 , a sixth side plate.
  • Board 16 the first side panel 11, the second side panel 12, the third side panel 13, and the fourth side panel 14 are connected in sequence, and are located at the sixth side panel 16 (or bottom panel) and the fifth side panel 15 respectively. (or cover), a closed cavity is formed, and the battery core 2 is placed in the cavity.
  • the first side panel 11 and the third side panel 13 are located on opposite sides of the second side panel 12 (or the fourth side panel 14 ).
  • the second side panel 12 and the fourth side panel 14 are located on the first side panel 11 (or the fourth side panel 14 ).
  • the fifth side panel 15 and the sixth side panel 16 are respectively located on the first side panel 11 (or the second side panel 12, or the third side panel 13, or the fourth side panel 14). opposite sides of.
  • the direction of the fifth side plate 15 to the sixth side plate 16 is the thickness direction of the casing 1
  • the direction of the first side plate 11 to the third side plate 13 can be the length direction of the casing 1
  • the direction of the second side plate 12 to The direction of the fourth side plate 14 is the width direction of the casing 1
  • the direction of the first side plate 11 to the third side plate 13 is the width direction of the casing 1
  • the direction of the second side plate 12 to the fourth side plate 14 is The length direction of the housing 1.
  • One of the first side of the battery core 2 and the second side of the battery core 2 is the side of the battery core 2 facing the fifth side plate 15
  • the other is the side of the battery core 2 facing the sixth side plate 16 .
  • the insulating layer 86 is located between the first connecting piece 51 and the fifth side plate 15 and/or between the fifth connecting piece 55 and the fifth side plate 15 .
  • arc transition portions 17 can be passed between the first side plate 11 and the second side plate 12 , between the second side plate 12 and the third side plate 13 , and between the third side plate 13 and the fourth side plate 14 . Connection, that is, the connecting part of two adjacent side panels is transitioned through an arc.
  • the arc transition portion 17 has a cross-section perpendicular to the first direction.
  • the side away from the cavity and the side facing the cavity are arcs respectively, forming a groove with an opening facing the cavity.
  • the first direction is parallel to The direction from the fifth side plate 15 to the sixth side plate 16 (that is, the thickness direction of the housing 1).
  • the case 1 can also be provided with a thinned portion 151.
  • the mechanical strength of the thinned portion 151 is smaller than the mechanical strength of other parts of the case 1 except the thinned portion 151. Therefore, when the internal pressure of the battery is too high, priority can be given to The pressure is released through the thinned portion 151 to avoid battery explosion and other phenomena.
  • the thinned portion 151 may be provided on the fifth side plate 15 (the surface of the fifth side plate 15 may be parallel to the surface of the electrode sheet).
  • the thickness of the thinned portion 151 is smaller than the thickness of other portions of the housing 1 except the thinned portion 151 .
  • the housing 1 also includes a sealing sheet for sealing the first through hole 100.
  • the first through hole 100 serves as a liquid injection hole for injecting electrolyte into the cavity. After the electrolyte is injected, the sealing sheet is used to seal the injection hole.
  • the liquid hole 100 is sealed.
  • the sealing sheet can include a metal sheet, which is located on the side of the first side plate 11 facing away from the cavity. It can be welded to the side of the first side plate 11 facing away from the cavity. Specifically, it can be welded on the first side.
  • the plate 11 is located at a portion around the first through hole 100 to seal the first through hole 100 .
  • the welding can specifically be laser welding.
  • the first connecting piece 51 of the first connecting member 5 can be connected to the second adapter portion 312 of the first adapter 31 through laser welding and sealing.
  • the first through hole 100 is sealed by laser welding.
  • the first pole tab 21 may be a positive pole tab or a negative pole tab, that is, one of the first pole tab 21 and the second pole tab 22 is a positive pole tab, and the other is a negative pole tab.
  • the first pole tab 21 is a positive pole tab.
  • the housing 1 may specifically be a metal packaging shell, that is, it may be made of metal, that is, the first side plate 11 , the second side plate 12 , the third side plate 13 , the fourth side plate 14 , the fifth side plate 15 ,
  • the six side plates 16 may be made of metal, such as aluminum, aluminum alloy, nickel, iron or nickel-iron alloy.
  • the housing 1 when the housing 1 is electrically connected to the positive terminal, the housing 1 can be made of the same polarity material as the positive terminal, such as aluminum or aluminum alloy respectively.
  • the specific materials of the two can be the same or different (the two materials can be the same or different).
  • the materials are different, for example, the material of the positive electrode ear is aluminum, and the material of the housing 1 is aluminum alloy); when the housing 1 and the negative electrode ear are electrically connected, the housing 1 and the negative electrode ear are made of the same polarity, such as nickel respectively. , iron or nickel-iron alloy, the specific material types of the two can be the same or different.
  • the material of the first adapter 31 , the material of the first coupling 5 , and the material of the first tab 21 can be materials of the same polarity.
  • the first tab 21 is a positive tab
  • the first adapter 31 The material of , the material of the first connecting member 5 , and the material of the first tab 21 can be aluminum or aluminum alloy respectively, and their specific material types can be the same or different.
  • the material of the second adapter 32 , the material of the second connecting member 5 ′, and the material of the second tab 22 may be materials of the same polarity.
  • the second tab 22 is a negative tab, and the material of the second adapter 32
  • the material, the material of the second connecting member 5', and the material of the second tab 22 can respectively be nickel, iron or nickel-iron alloy, and their specific material types can be the same or different.

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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)
  • Materials Engineering (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

La présente invention concerne une batterie, comprenant : un boîtier, définissant une cavité, le boîtier comprenant une première plaque latérale et la première plaque latérale étant pourvue d'un premier trou traversant en communication avec la cavité ; une cellule de batterie, située dans la cavité, la cellule de batterie étant pourvue d'une première languette ; et un premier adaptateur, raccordé électriquement à la première languette. Le premier adaptateur est disposé entre la première plaque latérale et la cellule de batterie, le premier adaptateur est pourvu d'un second trou traversant, le premier adaptateur est relié à la première plaque latérale et une saillie du premier trou traversant et une saillie du second trou traversant sur la première plaque latérale se chevauchent au moins partiellement. Selon la présente invention, les performances telles que les performances d'étanchéité et la sécurité de la batterie peuvent être améliorées.
PCT/CN2023/075904 2022-03-26 2023-02-14 Batterie WO2023185283A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202210304872.1A CN114597610A (zh) 2022-03-26 2022-03-26 电池
CN202210304872.1 2022-03-26

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WO2023185283A1 true WO2023185283A1 (fr) 2023-10-05

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PCT/CN2023/075904 WO2023185283A1 (fr) 2022-03-26 2023-02-14 Batterie

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CN (1) CN114597610A (fr)
WO (1) WO2023185283A1 (fr)

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CN114597610A (zh) * 2022-03-26 2022-06-07 珠海冠宇电池股份有限公司 电池
CN217641722U (zh) * 2022-06-30 2022-10-21 珠海冠宇电池股份有限公司 电池及电子设备
CN217589145U (zh) * 2022-06-30 2022-10-14 珠海冠宇电池股份有限公司 一种电池
CN218039744U (zh) * 2022-09-02 2022-12-13 珠海冠宇电池股份有限公司 电池及电子设备
CN218385470U (zh) * 2022-09-27 2023-01-24 珠海冠宇电池股份有限公司 电池及电子设备
CN218586277U (zh) * 2022-10-21 2023-03-07 珠海冠宇电池股份有限公司 电池
CN115632214B (zh) * 2022-10-31 2024-01-23 厦门海辰储能科技股份有限公司 电池的连接片和电池、用电装置
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