WO2023185279A1 - Battery - Google Patents

Battery Download PDF

Info

Publication number
WO2023185279A1
WO2023185279A1 PCT/CN2023/075839 CN2023075839W WO2023185279A1 WO 2023185279 A1 WO2023185279 A1 WO 2023185279A1 CN 2023075839 W CN2023075839 W CN 2023075839W WO 2023185279 A1 WO2023185279 A1 WO 2023185279A1
Authority
WO
WIPO (PCT)
Prior art keywords
side plate
tab
pole
battery core
piece
Prior art date
Application number
PCT/CN2023/075839
Other languages
French (fr)
Chinese (zh)
Inventor
卫志达
彭宁
谢斌
徐延铭
王智峰
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 WO2023185279A1 publication Critical patent/WO2023185279A1/en

Links

Classifications

    • 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
    • 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
    • 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
    • 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 battery energy density and other performance are getting higher and higher. Therefore, there is an urgent need to improve the energy density and other performance of batteries.
  • the invention provides a battery that can improve the energy density and other properties of the battery.
  • the invention provides a battery, which includes: a casing, which is surrounded by a cavity; the casing includes a first side plate; and a battery core is located in the cavity, and the battery core faces one side of the first side plate.
  • a first pole is provided on one side and an extension extends toward the first side plate. The distance from the side where the first pole is connected to the battery core to the first side plate is greater than the extension. distance from the bottom to the first side plate.
  • the projection of the first tab on the first side plate does not overlap with the projection of the extension part on the first side plate.
  • the battery further includes a sixth side plate connected to the first side plate, and the projection of the first tab on the sixth side plate is consistent with the position of the extension portion.
  • the projections on the sixth side panel at least partially overlap.
  • the battery further includes a first conductive member located in the cavity, and the first conductive member is electrically connected to the first tab; the first conductive member includes and a second connecting piece.
  • the first tab includes a second connecting portion connected to the second connecting piece.
  • the battery core includes a plurality of pole pieces arranged in a stack, and a side of the second connecting portion of the first pole tab connected to the second connecting piece of the first conductive member and The extending directions of the pole pieces are substantially parallel.
  • the battery further includes a third terminal electrically connected to the first tab.
  • a guide piece, the first guide piece is located in the cavity, the first guide piece includes a second connecting piece; the housing includes a second side plate connected to the first side plate, The first tab includes a connected first connection part and a second connection part.
  • the first connection part is connected to the battery core, wherein the second connection part is on a side facing away from the second side plate. Connected to the second connecting piece; or, the side of the second connecting portion facing the second side plate is connected to the second connecting piece.
  • the battery core includes a first pole piece, a second pole piece, and a separator located between the first pole piece and the second pole piece that are stacked in sequence.
  • the first pole tab Disposed on the first pole piece; the second connecting portions of the plurality of first pole tabs are sequentially attached to form a first pole plate, and the first pole plate is connected to the first conductive member.
  • the housing includes a second side plate and a third side plate connected to the first side plate, and the second side plate is opposite to the third side plate;
  • the second connecting portion of the first tab is laminated toward the second side plate to form the first tab plate, or the second connecting portion of the first tab is oriented toward the third side plate.
  • the side plates are bonded in the direction to form the first tab plate, or the second connecting portion of the first tab is bonded toward the centerline in the thickness direction of the battery core to form the first pole. ear plate.
  • the distance from the first tab plate to the first side plate is greater than or equal to the distance from the extension part to the third side plate. The distance between the side panels.
  • the first conductive member further includes a first connecting piece connected to the second connecting piece, and the first connecting piece is located between the first side plate and the first pole. between the first connecting portions of the ears; and/or, the second connecting piece is located between the second side plate and the second connecting portion of the first tab; and/or, the first connecting piece
  • a first included angle is formed between the surface of the second connection portion and the battery core, and the surface of the second connection portion and the second connecting piece. The range of the first included angle is 80-120°. .
  • a second included angle is formed between the plane where the first connecting piece is located and the plane where the second connecting piece is located, and the range of the second included angle is 80-120°.
  • the distance from the second connection part of the first tab to the second side plate is greater than or equal to the distance from the battery core to the second side plate.
  • the battery further includes a first conductor electrically connected to the first tab, and the first conductor is located in the cavity; the housing further includes a second conductor. side panel, so The projection of the first guide member on the second side plate does not overlap with the projection of the extension portion on the second side plate.
  • the battery further includes a first conductive member electrically connected to the first tab, the first conductive member is located in the cavity, and the first conductive member includes a first connecting piece; the battery further includes a first external connecting piece provided on the side of the first side plate facing away from the cavity, the first external connecting piece includes a first pole formed by protruding outwards, The first connecting piece includes a first through hole corresponding to the first pole. The first pole penetrates the first side plate and connects to the first pole through the first through hole. The connecting pieces are connected.
  • the first through hole of the first connecting piece includes a first hole section and a second hole section connected to each other, and the second hole section is located near the first hole section and close to the electrical circuit.
  • One side of the core; one end of the first pole close to the battery core extends outward to form a first extension portion corresponding to the second hole section.
  • an end surface of the first pole close to the battery core is flush with a side surface of the first connecting piece close to the battery core.
  • one end of the first pole close to the battery core extends out of the first through hole, and extends outward along the circumferential direction of the first through hole to form a hole connected to the first through hole.
  • a connecting piece is close to the first extension portion in contact with one side surface of the battery core.
  • a first insulating piece is further provided between the first external piece and the first side plate, and a first insulation piece is further provided between the first conductor and the first side plate.
  • a second insulating sheet, the first pole penetrates the first insulating sheet and the second insulating sheet; and/or a first insulating layer is provided between the first pole and the first side plate .
  • the projection of the first insulating sheet on the first side panel covers the projection of the first external connecting sheet on the first side panel.
  • the housing further includes a second side plate connected to the first side plate, and the second insulation sheet includes a first insulation part and a second insulation part; the first insulation The first pole is located between the first side plate and the first conductor, and the first pole penetrates the first insulating part; the second insulating part is located between the second side plate and the first conductor. between the first conductors.
  • the projection of the second insulating part on the second side plate covers the projection of the first conductive member on the second side plate, and/or the first insulating part is on the second side plate.
  • the projection on the first side panel covers the projection of the first guide member on the first side panel.
  • the number of the extension parts is at least two, and the first tab is located between two adjacent extension parts; and/or, the extension part is on the electrical
  • the length in the core thickness direction is equal to the thickness of the battery core.
  • a second tab is further provided on a side of the battery core facing the first side plate, and the second tab has an opposite polarity to the first tab.
  • the distance from the side of the second tab connected to the battery core to the first side plate is greater than the distance from the extension part to the first side plate; and/ Or, the battery further includes a second conductive member electrically connected to the second tab, and the second conductive member is located in the cavity; the second conductive member includes a third connecting piece and a third Four connecting pieces, the third connecting piece is located between the first side plate and the second tab, the second tab includes a fourth connecting portion connected to the fourth connecting piece; and /Or, the battery further includes a second conductive member electrically connected to the second tab, the second conductive member is located in the cavity; the second conductive member includes a fourth connecting piece, The second tab includes a fourth connecting portion connected to the fourth connecting piece; the battery core includes a plurality of stacked pole pieces, and the fourth connecting portion of the second tab is connected to the third connecting piece.
  • the connecting surface of the fourth connecting piece of the two conductive members is substantially parallel to the extending direction of the pole piece.
  • the extension portion is present between the second pole tab and the first pole tab; and/or the number of the extension portions is at least two, and the second pole tab Located between two adjacent extension parts; and/or, the projection of the second tab on the first side plate does not overlap with the projection of the extension part on the first side plate.
  • the housing also It includes a sixth side plate connected to the first side plate, and the projection of the second tab on the sixth side plate at least partially overlaps with the projection of the extension part on the sixth side plate; And/or, the housing further includes a sixth side plate connected to the first side plate, and the projection of the second pole on the sixth side plate is consistent with the projection of the first pole on the sixth side plate.
  • the projections on the sixth side panel at least partially overlap.
  • the battery further includes a buffer piece located between the extension part and the first side plate.
  • the battery further includes a buffer piece, the buffer piece includes a connected first buffer part and a second buffer part, the first buffer part is located between the extension part and the first side Between the plates, the second buffer portion is located between the first connecting portion of the first tab and the first connecting piece of the first conductor.
  • the width of the first buffer part is greater than or equal to the width of the second buffer part; and/or the second buffer part is provided with a first groove, and the first pole The second connecting portion of the ear extends into the first groove.
  • the projection of the second buffer portion in the thickness direction of the battery core is consistent with the projection of the second connecting portion of the first tab and the first conductor in the battery core.
  • the projections in the thickness direction partially overlap; and/or, the length of the first groove in the width direction of the battery core is greater than or equal to the length of the second connection portion of the first tab in the battery core.
  • the length in the width direction; and/or, the length of the first groove in the thickness direction of the battery core is greater than or equal to the thickness of the second connection portion of the first tab in the battery core
  • the length in the direction; and/or, along the length direction of the battery core, the end of the second connecting portion of the first tab extends out of the first groove.
  • the width of the battery core is a
  • the length of the buffer sheet in the width direction of the battery core is b, 0 ⁇
  • the battery core has a first surface and a second surface that are oppositely arranged, and a side surface located between the first surface and the second surface, and at least one side of the battery core At least part of the side area is provided with a first protective adhesive layer.
  • the battery core includes a plurality of stacked pole pieces, and the first protective adhesive layer on the side of the battery core extends to the first surface of the battery core and is in contact with the battery core.
  • the pole pieces on the first side are bonded and/or extended to the second side of the battery core and bonded to the pole pieces located on the second side of the battery core.
  • the number of the first protective adhesive layers is multiple, and the plurality of first protective adhesive layers are arranged at intervals on the side of the battery core.
  • the extension part has an opposite first surface and a second surface, and the first surface of the extension part and/or the second surface of the extension part is provided with a second protective glue layer.
  • the direction from the first surface of the extension part to the second surface of the extension part is perpendicular to the direction from the first tab to the extension part.
  • the first tab is a positive tab or a negative tab; and/or, the battery core includes a laminated battery core or a wound battery core.
  • the side of the battery core with the first tab has an extension portion, and the distance from the side where the first tab is connected to the battery core to the first side plate is greater than the distance from the extension portion to the first side plate. , thereby avoiding the waste of cavity space caused by arranging the first tab, and increasing the capacity of the battery core in the cavity through the extension.
  • the volume of the functional area thereby improves the energy density and other performance of the battery.
  • Figure 1 is a schematic structural diagram of a battery according to an embodiment of the present invention.
  • Figure 2 is a schematic structural diagram of a battery core according to an embodiment of the present invention.
  • Figure 3 is a partial cross-sectional schematic diagram of a battery showing a first pole according to an embodiment of the present invention
  • Figure 4 is a schematic diagram showing the connection structure of the first conductor and the housing according to an embodiment of the present invention.
  • Figure 5 is a schematic diagram showing the connection structure of the first conductor and the housing according to an embodiment of the present invention.
  • FIG. 6 is an enlarged view of a partial area showing the connection structure between the first conductive member and the housing 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 or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, or it can be an internal connection between two components.
  • the above-mentioned specific meanings in the present invention can be understood in specific situations.
  • a battery is a commonly used electrochemical energy storage device. It generally includes a casing, a battery core packaged in a cavity surrounded by the casing, etc.
  • the battery core is provided with tabs (such as the first tab below).
  • a large space usually needs to be reserved between the casing and the battery core for the placement of the tabs, resulting in a large waste of cavity space and affecting the energy density and other performance of the battery.
  • an embodiment of the present invention provides a battery, which includes: a housing 1, which is surrounded by a cavity; the housing 1 includes a first side plate 11; and a battery core 2, which is located in the cavity. 2.
  • the side facing the first side plate 11 is provided with a first tab 21 and an extension 23 extending toward the first side plate 11.
  • the side of the first tab 21 in contact with the battery core 2 reaches the first side plate.
  • the distance 11 is greater than the distance from the extending portion 23 to the first side plate 11 . Therefore, the space between the first side plate 11 and the end surface of the battery core 2 with the first tabs 21 is used to extend the portion of the battery core 2 without the tabs 21 to form the extension portion 23 , thereby improving the energy density of the battery. performance.
  • the side of the battery core 2 facing the first side plate 11 is also provided with a second tab 22.
  • the second tab 22 has an opposite polarity to the first tab 21.
  • the first tab 21 and the second tab 22 are Being arranged on the same side of the battery cell 2 will help further save the cavity space and improve the energy density and other performance of the battery.
  • the first tab 21 may be a positive tab or a negative tab
  • the second tab 22 may be a negative tab or a positive tab.
  • the distance between the side of the second tab 22 that is connected to the battery core 2 and the first side plate 11 is greater than the distance from the extension 23 to the first side plate 11 .
  • the distance from the first side plate 11 to the first side plate 11 and the distance from the side where the first tab 21 is connected to the battery core 2 to the first side plate 11 may be equal or different, preferably substantially equal, which is more conducive to saving cavity space and improving the efficiency of the cavity. Battery energy density and other properties.
  • the side of the battery core 2 facing the first side plate 11 has a first area, a second area and a third area. Three regions, the third region extends toward the first side plate 11 to form an extension 23. The distance from the end face of the first region to the first side plate 11 and the distance from the end face of the second region to the first side plate 11 are respectively smaller than the third region. The distance from the end surface of the region to the first side plate 11 is: the first tab 21 is disposed on the end surface of the first region, and the second tab 22 is disposed on the end surface of the second region.
  • the projection of the first tab 21 on the first side plate 11 and the projection of the extension 23 on the first side panel 11 may not overlap (that is, the first tab 21 is parallel to the extension of the first side plate 11 direction does not overlap with the projection of the extending portion 23 parallel to the extending direction of the first side plate 11 ), the projection of the second tab 22 on the first side plate 11 does not overlap with the projection of the extending portion 23 on the first side plate 11
  • the projection of the second pole tab 22 on the first side plate 11 and the projection of the first pole tab 21 on the first side plate 11 may not overlap.
  • the extension direction of the first side plate 11 is parallel to the surface of the first side plate 11 .
  • the direction from the first side plate 11 to the battery core 2 is parallel to the length direction of the housing 1 .
  • the first side plate 11 The extension direction of may be the width direction of the housing 1 or the thickness 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 pole pieces (or electrode sheets). The pole pieces 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 battery further includes a sixth side plate 16 connected to the first side plate 11 , and the projection of the first tab 21 on the sixth side plate 16 at least partially overlaps with the projection of the extension 23 on the sixth side plate 16 ,
  • the projection of the second pole lug 22 on the sixth side plate 16 and the projection of the extension part 23 on the sixth side plate 16 may at least partially overlap.
  • the projection of the second pole lug 22 on the sixth side plate 16 is consistent with the projection of the first pole
  • the projection of the ear 21 on the sixth side plate 16 can at least partially overlap.
  • the projection of the extension portion 23 on the sixth side plate 16 can cover the projection of the first pole 21 on the sixth side plate 16 and the second pole.
  • the projection of 22 on the sixth side panel 16 is consistent with the projection of the first pole 21 on the sixth side plate 16 .
  • the extension portion 23 , the first tab 21 , and the second tab 22 may be distributed along a first direction that is perpendicular to the direction from the battery core 2 to the first side plate 11 , for example, the battery core 2 in the width direction (that is, the projection of the extension portion 23 perpendicular to the width direction of the battery core 2 at least partially overlaps with the projection of the first tab 21 perpendicular to the width direction of the battery core 2 ).
  • the surface of the sixth side plate 16 may be perpendicular to the surface of the first side plate 11
  • the surface of the sixth side plate 16 may be perpendicular to the surface of the electrode sheet (parallel to the thickness direction of the electrode sheet)
  • the surface of the first side plate 11 may be perpendicular to the surface of the electrode sheet.
  • the surface is perpendicular to the surface of the electrode sheet.
  • the length of the extension portion 23 in the thickness direction of the battery core 2 is equal to the thickness of the battery core 2 .
  • the extension part 23 and the battery core 2 respectively have opposite first and second surfaces.
  • the first surface and the second surface are respectively located at the end surface of the battery core 2 facing the first side plate 11 (that is, the first pole is provided with the end surface of the battery core 2 facing the first side plate 11.
  • the first surface of the extension part 23 is flush with the first surface of the battery core 2
  • the second surface of the extension part 23 is flush with the second surface of the battery core 2 .
  • the number of extension parts 23 may be at least two, the first pole 21 may be located between two adjacent extension parts 23, and the second pole 22 may also be located between two adjacent extension parts 23, There is an extension portion 23 between the second pole tab 22 and the first pole tab 21 (that is, the first pole tab 21 and the second pole tab 22 are separated by the extension portion 23).
  • the number of first pole tabs 21 is n1
  • the number of second pole tabs 22 is n2
  • the number of extension parts 23 is n3.
  • the battery also includes a first conductor electrically connected to the first tab 21, and the first conductor is located in the cavity; the first conductor includes a second connecting piece 32, and the first tab 21 includes a second connecting piece 32.
  • the second connecting portion 212 is in contact with the connecting pieces 32 .
  • the surface of the second connecting part 212 that is in contact with the second connecting piece 32 is substantially parallel to the surface of the pole piece.
  • the second connecting part 212 and the second connecting piece 32 are stacked, and the surface of the second connecting part 212, The surface of the second connecting piece 32 is substantially parallel to the surface of the pole piece.
  • the projection of the second connecting portion 212 of the first tab 21 on the first side panel 11 is in contact with the boundary of the projection of the second connecting piece 32 of the first conductor on the first side panel 11 .
  • the remaining parts do not overlap each other.
  • the housing 1 includes a second side plate 12 connected to the first side plate 11
  • the first tab 21 further includes a first connecting part 211 connected to the second connecting part 212 .
  • the first connecting part 211 Connected to the battery core 2 , the side of the second connecting portion 212 away from the second side plate 12 is connected to the first conductive member, specifically, it can be connected to the second connecting piece 32 of the first conductive member, that is, the second side The board 12, the second connecting part 212, and the second connecting piece 32 are stacked in sequence, and the second connecting part 212 is located between the second side plate 12 and the second connecting piece 32; or, the second connecting part 212 faces the second side plate.
  • One side of 12 is connected to the first conductive member, specifically, it can be connected to the second connecting piece 32 of the first conductive member, that is, the second side plate 12, the second connecting piece 32, and the second connecting portion 212 are stacked in sequence.
  • the second connecting piece 32 is located between the second side plate 12 and the second connecting portion 212 .
  • the side of the first connecting part 211 that is connected to the battery core 2 and the second connecting part 212 A first included angle is formed between the surfaces that are in contact with the second connecting piece 32 .
  • the first included angle ranges from 80° to 120°, such as 80°, 90°, 100°, 120°, etc.
  • the surface of the second side plate 12 is parallel to the surface of the pole piece, the surface of the second side plate 12 is perpendicular to the surface of the first side plate 11 , and the surface of the second side plate 12 is perpendicular to the surface of the sixth side plate 16 .
  • the surface of the first connecting portion 211 of the first tab 21 can be perpendicular to the surface of the second connecting portion 212 , wherein the surface of the first connecting portion 211 can be perpendicular to the surface of the pole piece, and the surface of the second connecting portion 212 can be perpendicular to the surface of the pole piece.
  • the sheet surfaces are parallel.
  • the first conductive member also includes a first connecting piece 31 connected to the second connecting piece 32; the first connecting piece 31 is located between the first side plate 11 and the first tab 21, specifically, it can be located on the first side plate. 11 and the first connecting portion 211 of the first tab 21, the distance between the first connecting piece 31 and the first connecting portion 211 may be equal to or greater than the distance along the edge of the second connecting portion 212 (or the second connecting piece 32). The length in the direction from the first connecting portion 211 to the first connecting piece 31 .
  • a second included angle is formed between the plane where the first connecting piece 31 is located and the plane where the second connecting piece 32 is located.
  • the second included angle ranges from 80° to 120°, such as 80°, 90°, 100°. °, 120°, etc.
  • the battery core 2 includes pole pieces that are stacked in sequence.
  • the pole pieces include first pole pieces and second pole pieces.
  • a separator is provided between the first pole piece and the second pole piece. That is, the battery core includes pole pieces that are stacked in sequence.
  • the first pole piece, the second pole piece, and the separator located between the first pole piece and the second pole piece, the polarity of the first pole piece and the second pole piece are opposite, for example, the first pole piece is the positive pole piece , the second pole piece is a negative pole piece, or the first pole piece is a negative pole piece, and the second pole piece is a positive pole piece, the first pole tab 21 is arranged on the first pole piece, and the second pole tab 22 is arranged on the second pole piece.
  • the number of the first pole piece and the second pole piece is multiple respectively, and each first pole piece is provided with at least one first pole tab 21 (that is, the number of the first pole tab 21 is multiple), and the plurality of first pole tabs 21 are provided.
  • the second connecting portions 212 of the first tab 21 are sequentially attached to form a first tab plate, and the first tab plate is connected to the first conductive member to realize the connection between the first tab 21 and the first conductive member. Specifically, It can be connected with the second connecting piece 32 of the first guide member.
  • the first pole piece, the separator, and the second pole piece that are at least partially stacked are arranged as follows: one end of the first pole piece, the separator, and the second pole piece is provided with a first notch (or first notch). , the position of the first notch corresponds to the first pole tab located in the first notch of the first pole piece. After the first pole piece, the diaphragm, and the second pole piece are stacked, the side of the first notch of the first pole piece The wall, the side wall of the first recess of the diaphragm, and the side wall of the first recess of the second pole piece are sequentially joined to form the extension 23.
  • first tabs of the electrodes are sequentially joined to form the first tab plate; one end of the first pole piece, the diaphragm, and the second pole piece are each provided with a second notch (or second notch), and the position of the second notch corresponds to , the second pole tab is located in the second notch of the second pole piece.
  • the side walls of the first notch of the first pole piece and the first notch of the diaphragm are laminated in sequence to form the extension part 23, and the second tabs in the second recess of the second pole piece are laminated in sequence to form a second tab plate.
  • the housing 1 also includes a third side plate 13 connected to the first side plate 11 .
  • the second side plate 12 is opposite to the third side plate 13 .
  • the surface of the second side plate 12 can be aligned with the surface of the third side plate 13 .
  • the surfaces are parallel.
  • the second connecting portion 212 of the first tab 21 is attached in a direction close to the second side plate 12 to form a first tab plate, that is, the first tab plate to the second tab plate.
  • the distance between the two side plates 12 is smaller than the distance from the first tab plate to the third side plate 13 .
  • the second connecting portion 212 of the first tab 21 is attached in a direction close to the third side plate 13 to form a first tab plate, that is, from the first tab plate to the third side plate 13 .
  • the distance is smaller than the distance from the first tab plate to the second side plate 12 .
  • the second connecting portion 212 of the first tab 21 is aligned toward the centerline in the thickness direction of the battery core 2 to form a first tab plate, that is, the first tab plate to the second side plate.
  • the distance 12 may be substantially equal to the distance from the first tab plate to the third side plate 13 .
  • the first tab 21 and the first tab plate formed by the second connecting portions 212 of the plurality of first tabs 21 do not protrude from the battery core 2
  • the outer edge of the first tab 21, specifically, the distance from the second connecting portion 212/first tab plate of the first tab 21 to the second side plate 12 can be greater than or equal to the distance from the battery core 2 to the second side plate 12.
  • the first The distance from the second connecting portion 212/first tab plate of the tab 21 to the third side plate 13 may be greater than or equal to the distance from the battery core 2 to the third side plate 13 .
  • the projection of the second connecting piece 32 connected to the second connecting part 212/the first lug plate on the first side plate 11 is at least partially located within the projection of the battery core 2 on the first side plate 11, which can reduce the The space of the cavity in the direction from the second side plate 12 to the third side plate 13 is wasted, thereby improving the energy density and other performance of the battery.
  • the second connecting piece 32 is disposed on the side of the second connecting part 212/first lug plate facing the second side plate 12 as an example, along the second connecting part 212/first lug plate to the second In the direction of the side plate 12, the second connecting piece 32 at least partially extends between the second connecting portion 212/the first tab plate and the side of the battery core 2 facing the second side plate 12 (that is, the second connecting piece 32 extends
  • the projection of the portion between the second connecting portion 212/the first tab plate and the side of the battery core 2 facing the second side plate 12 on the first side plate 11 is located on the battery core. 2 within the projection on the first side plate 11) to be connected with the second connection part 212/second lug plate (but not in contact with the extension part 23).
  • the extension portion 23 may be level with the first tab plate/first tab 21 , or the extension portion 23 may be larger than the first tab plate/
  • the first tab 21 is closer to the first side plate 11 , that is, the distance from the first tab plate/first tab 21 to the first side plate 11 is equal to or greater than the distance from the extension 23 to the first side plate 11 , so that It is beneficial to further improve the energy density of the battery. But it is not limited thereto.
  • the first tab plate/first tab 21 may be closer to the first side plate 11 than the extension 23 , that is, the first tab plate/first tab 21 to The distance between the first side plate 11 is less than the distance from the extension 23 to the first side plate 11 , that is, in the direction from the battery core 2 to the first side plate 11 , the first tab plate/first tab 21 The end far away from the battery core 2 is located between the extension 23 and the first side plate 11, which is relatively more conducive to the connection between the first tab 21/the first tab plate and the second connecting piece 32, increasing the contact area between the two and improving stability. sex.
  • the projection of the first guide member on the second side panel 12 does not overlap with the projection of the extension portion 23 on the second side panel 12 , that is, the projection of the first connecting piece 31 on the second side panel 12 and the projection of the second connecting piece 31 on the second side panel 12 do not overlap.
  • the projection of the connecting piece 32 on the second side panel 12 does not overlap with the projection of the extension portion 23 on the second side panel 12 respectively.
  • the battery also includes a first external connection piece 41 disposed on the side of the first side plate 11 away from the cavity.
  • the first external connection piece 41 includes a first pole 42 formed by protruding outward.
  • the first side plate 11 is provided with
  • the third through hole 110 is provided corresponding to the first pole 42 , and the first pole 42 is connected to the first connecting piece 31 through the third through hole 110 .
  • the first connecting piece 31 includes a first through hole 30 corresponding to the first pole 42.
  • the first pole 42 penetrates the first side plate 11 (ie, passes through the third through hole 110) and passes through the first through hole 110.
  • the through hole 30 is connected to the first connecting piece 31 .
  • the first pole 42 passes through the third through hole 110 to penetrate the first side plate 11 .
  • the third through hole 110 and the first through hole 30 may be coaxially arranged.
  • the cross section of the first pole 42 perpendicular to the axial direction of the first pole 42 is circular.
  • the first pole 42 may be cylindrical, or the first pole 42 may be tapered. structure, that is, along the direction from the first side plate 11 to the first connecting piece 31, the diameter of the first pole 42 shows an increasing or decreasing trend, and the diameter of the first pole 42 is the diameter of the first pole 42 perpendicular to the first pole 42.
  • the diameter of the axial cross-section of a pole 42 is circular.
  • the first pole 42 may be cylindrical, or the first pole 42 may be tapered. structure, that is, along the direction from the first side plate 11 to the first connecting piece 31, the diameter of the first pole 42 shows an increasing or decreasing trend, and the diameter of the first pole 42 is the diameter of the first pole 42 perpendicular to the first pole 42.
  • the diameter of the axial cross-section of a pole 42 is the diameter of the first pole 42 perpendicular to the first pole 42.
  • the diameter of the first pole 42 shows a changing trend (ie, an increasing or decreasing trend) along the direction from the first side plate 11 to the first connecting piece 31 .
  • the change It can be a gradual change, that is, a uniform increase or decrease with essentially the same amplitude.
  • the aperture (diameter) of the third through hole 110 and the first through hole 30 changes correspondingly with the diameter of the first pole 42 , for example, along the direction from the first side plate 11 to the first connecting piece 31 , the first pole 42 The diameter gradually increases.
  • the diameters of the third through hole 110 and the first through hole 30 also gradually increase; along the direction from the first side plate 11 to the first connecting piece 31, the diameter of the first pole 42 gradually increases. decreases, at this time, the diameters of the third through hole 110 and the first through hole 30 also gradually decrease.
  • the first through hole 30 of the first connecting piece 31 includes a first hole segment and a second hole segment connected to each other, and the second hole segment is located on the side of the first hole segment close to the battery core 2; One end of the pole 42 close to the battery core 2 extends outward to form a first 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 first through hole 30 can cover the first hole segment perpendicular to the first through hole 30. Axial projection of hole 30.
  • the cross-sectional area of the first external piece 41 perpendicular to the axial direction of the first pole 42 may be larger than the cross-sectional area of the first pole 42 perpendicular to the axial direction of the first pole 42 .
  • the first external piece 41 is perpendicular to the axial direction of the first pole 42 .
  • the axial projection of the first pole 42 covers the axial projection of the first pole 42 perpendicular to the first pole 42 , and the cross-sectional area of the first extension 43 perpendicular to the first pole 42 is larger than the first pole 42 42 is a cross-sectional area perpendicular to the axial direction of the first pole 42 , and the projection of the first extension 43 perpendicular to the axial direction of the first pole 42 covers the projection of the first pole 42 perpendicular to the axial direction of the first pole 42 , the cross-sectional area of the first external piece 41 perpendicular to the axial direction of the first pole 42 is greater than the cross-sectional area of the first extension 43 perpendicular to the axial direction of the first pole 42, and the first external piece 41 is perpendicular to the first pole.
  • the axial projection of the pole 42 covers the axial projection of the first extension 43 perpendicular to the first pole 42 , and the cross-sectional area of the first extension 43 perpendicular to the axial direction of the first pole 42 is substantially equal to the second
  • the cross-sectional area of the hole section is perpendicular to the axial direction of the first pole 42 (also the axial direction of the first through hole 30).
  • the first extension 43 is engaged with the second hole section and is connected to the side wall of the second hole section. connected.
  • an end surface of the first pole 42 close to the battery core 2 is flush with a side surface of the first connecting piece 31 close to the battery core 2 .
  • the thickness of the first extension portion 43 along the axial direction of the first through hole 30 is substantially equal to the depth of the second hole section along the axial direction of the first through hole 30 . Therefore, the first extension portion 43 snaps into place on the second through hole 30 .
  • an end surface of the first extension portion 43 close to the battery core 2 is flush with a side surface of the first connecting piece 31 facing the battery core 2 .
  • one end of the first pole 42 close to the battery core 2 protrudes from the first through hole 30 and extends outward along the circumferential direction of the first through hole 30 to form a connecting piece 31 close to the battery core.
  • the first extension 43 connected to one side surface of 2, that is, the end surface of the first pole 42 close to the battery core 2 is not flush with the side surface of the first connecting piece 31 facing the battery core 2, but is located on the first between connecting piece 31 and battery core 2.
  • the first external connecting piece 41, the first pole 42, and the first extension part 43 can be integrally formed, and they can be made of metal.
  • the first connecting piece 31 and the first side plate 11 can be riveted through rivets. , after riveting, the rivet is located at one end of the first side plate 11 away from the cavity to form the first external piece 41, the other end forms the first extension 43, and the part between the two ends forms the first pole 42, forming
  • the first pole 42 has a tapered structure, for example.
  • the first tab 21 can be electrically connected to the housing 1.
  • the first external piece 41, the first pole 42, and the first connecting piece 31 of the first conductive member can be in direct contact with the case 1, or
  • the second connecting piece 32 of the first transition is welded to the second side plate 12 (or the third side plate 13) of the housing 1 (the first connecting piece 31, the first external connecting piece 41, etc. may not be provided).
  • the first tab 21 is insulatedly connected to the housing 1.
  • the insulation can be performed by providing an insulating sheet (insulating layer).
  • a first insulating sheet 5 is disposed between the first external piece 41 and the first side plate 11, and a second insulating sheet 6 is disposed between the first conductor and the first side plate 11.
  • the first pole 42 penetrates the first insulating sheet 5 and the second insulating sheet 6, and a first insulating layer 8 is provided between the first pole 42 and the first side plate 11. Therefore, the first external piece 41 and the second insulating sheet 6 are connected to each other.
  • a pole 42, the first conductive member and the first tab 21 are electrically connected and insulated from the first side plate 11 (casing 1).
  • the second insulating sheet 6 can be specifically located between the first connecting sheet 31 and the first side plate 11 , that is, the first external connecting piece 41 , the first insulating sheet 5 , the first side plate 11 , the second insulating sheet 6 , and the first side plate 11 .
  • a connecting piece 31 is stacked in sequence.
  • the difference between the diameter of the first through hole 30 and the diameter of the pole is substantially equal to the width of the first insulating layer 8 along the circumferential direction of the first through hole 30 .
  • the circumferential direction of 30 is perpendicular to the axial direction of the first through hole 30 .
  • the first insulating layer 8 can be integrally formed with the first insulating sheet 5 , and the first insulating layer 8 protrudes outward from the side of the first insulating sheet 5 close to the first side plate 11 (into the third through hole 110 protrusions); alternatively, the first insulating layer 8 can be integrally formed with the second insulating sheet 6, and the first insulating layer 8 protrudes outward (toward the third side) from the side of the second insulating sheet 6 close to the first side plate 11.
  • the through hole 110 is formed with an inner protrusion).
  • the first insulating sheet 5 is provided with a fourth through hole 50, and the first pole 42 passes through the fourth through hole 50,
  • the second insulating sheet 6 is provided with a second through hole 60, and the first pole 42 passes through the second through hole 60 to achieve penetration of the second insulating sheet 6.
  • the first pole 42 passes through the fourth through hole 50 , the third through hole 110 , the second through hole 60 , and the first through hole 30 in order to achieve connection with the first conductive member.
  • the fourth through hole 50 , the third through hole 110 , the second through hole 60 and the first through hole 30 may be coaxially arranged.
  • the projection of the first insulating sheet 5 on the first side panel 11 can cover the projection of the first external sheet 41 on the first side panel 11 (that is, the projection of the first external sheet 41 on the first side panel 11 is located on the first side panel 11 ).
  • An insulating sheet 5 is within the projection on the first side panel 11).
  • the projection of the second insulating sheet 6 on the first side plate 11 can cover the projection of the first connecting piece 31 on the first side plate 11 , thereby further improving battery safety and stability.
  • the second insulating sheet 6 may have an L-shaped structure, which includes a first insulating part 61 and a second insulating part 62; the first insulating part 61 is located between the first side plate 11 and the first conductor, and the first insulating part 61 is located between the first side plate 11 and the first conductor.
  • the pole 42 penetrates the first insulating part 61 (that is, the second through hole 60 is provided on the third insulating part 61'); the second insulating part 62 is located between the second side plate 12 and the first conductor.
  • a third A conductive member provides support and can insulate the first conductive member from the second side plate 12 of the housing 1 to improve the safety and stability of the battery.
  • the projection of the first insulating part 61 on the first side plate 11 covers the projection of the first conductor on the first side plate 11 (covers the projection of the first connecting piece 31 on the first side plate 11), and the The projection of the two insulating parts 62 on the second side panel 12 covers the projection of the first conductive member on the second side panel 12 (covers the projection of the second connecting piece 32 on the second side panel 12 ).
  • the surface of the second side plate 12 is parallel to the surface of the electrode sheet; the surface of the second side plate 12 and the first side plate 11 are not parallel, for example, perpendicular; the second side plate 12 can be, for example, a bottom side plate (or bottom plate). ).
  • an included angle is formed between the surface of the first insulating part 61 and the first connecting piece 31 and the surface of the second insulating part 62 and the second connecting piece 32.
  • the included angle may range from 80° to 80°. 140°, such as 80°, 90°, 100°, 110°, 120°, 130°, 140°, etc., that is, the two are not parallel, such as perpendicular.
  • the included angle formed between the first insulating part 61 and the second insulating part 62 (the plane where they are located) may range from 80° to 140°, such as 80°, 90°, 100°, 110°, 120°, 130°. , 140°, etc., that is, they are not parallel, such as perpendicular.
  • the battery also includes a second conductor 3' electrically connected to the second tab 22.
  • the second conductor 3' Located in the cavity; the second conductive member 3' includes a fourth connecting piece 32', and the second tab 22 includes a fourth connecting portion 222 connected to the fourth connecting piece 32'.
  • the side of the fourth connecting portion 222 that is in contact with the fourth connecting piece 32' is substantially parallel to the extending direction of the pole piece (ie, the surface of the pole piece).
  • the fourth connecting portion 222 is stacked with the fourth connecting piece 32'. It is provided that the surface of the fourth connecting part 222, the surface of the fourth connecting piece 32' and the surface of the pole piece are substantially parallel.
  • the projection of the fourth connecting portion 222 of the second tab 22 on the first side panel 11 is in contact with the boundary of the projection of the fourth connecting piece 32' of the first guide member on the first side panel 11. But the remaining parts except the touching boundaries do not overlap each other.
  • the housing 1 includes a second side plate 12 connected to the first side plate 11
  • the second tab 22 further includes a third connecting part 221 connected to the fourth connecting part 222 .
  • the third connecting part 221 Connected to the battery core 2, wherein the side of the fourth connecting portion 222 away from the second side plate 12 is connected to the second conductive member 3', specifically, it can be connected to the fourth connecting piece 32' of the second conductive member 3'.
  • the fourth connecting part 222 is located between the second side plate 12 and the fourth connecting piece 32'; or, the fourth connection
  • the side of the portion 222 facing the second side plate 12 is connected to the second guide member 3', specifically, it can be connected to the fourth connecting piece 32' of the second guide member 3', that is, the second side plate 12, the fourth connection piece 32'.
  • the piece 32' and the fourth connecting part 222 are stacked in sequence, and the fourth connecting piece 32' is located between the second side plate 12 and the fourth connecting part 222.
  • a second included angle is formed between the side of the third connecting portion 221 that connects with the battery core 2 and the side that connects the fourth connecting portion 222 with the fourth connecting piece 32'.
  • the range is 80-120°, such as 80°, 90°, 100°, 120°, etc.
  • the surface of the third connecting part 221 of the second tab 22 may be perpendicular to the surface of the fourth connecting part 222
  • the surface of the third connecting part 221 may be perpendicular to the surface of the pole piece
  • the surface of the fourth connecting part 222 may be perpendicular to the surface of the pole piece.
  • the pole piece surfaces are parallel.
  • the second conductive member 3' also includes a third connecting piece 31' connected to the fourth connecting piece 32'; the third connecting piece 31' is located between the first side plate 11 and the second tab 22. Specifically, Located between the first side plate 11 and the third connection part 221 of the second tab 22 , the distance between the third connection piece 31 ′ and the third connection part 221 may be equal to or greater than the fourth connection part 222 (or the fourth connection part 221 ). The length of the connecting piece 32') in the direction from the third connecting portion 221 to the third connecting piece 31'.
  • a second included angle is formed between the plane where the third connecting piece 31' is located and the plane where the fourth connecting piece 32' is located.
  • the second included angle ranges from 80° to 120°, such as 80° or 90°. , 100°, 120°, etc.
  • the second pole tab 22 is provided on the second pole piece, and each second pole piece is provided with at least one second pole tab 22 (that is, the number of the second pole tabs 22 is multiple).
  • the plurality of second pole tabs 22 are arranged on the second pole piece.
  • the fourth connecting portions 222 of 22 are sequentially fitted to form a second tab plate, and the second tab plate is connected to the second conductive member 3' to realize the connection between the second tab 22 and the second conductive member 3'. Specifically, It can be connected with the fourth connecting piece 32' of the second guide member 3'.
  • the fourth connecting portion 222 of the second tab 22 is attached toward the second side plate 12 to form a second tab plate, that is, the second tab plate to the second tab plate.
  • the distance between the two side plates 12 is smaller than the distance from the second tab plate to the third side plate 13 .
  • the fourth connecting portion 222 of the second tab 22 is attached in a direction close to the third side plate 13 to form a second tab plate, that is, from the second tab plate to the third side plate 13 .
  • the distance is smaller than the distance from the second tab plate to the second side plate 12 .
  • the fourth connecting portion 222 of the second tab 22 is aligned toward the centerline in the thickness direction of the battery core 2 to form a second tab plate, that is, the second tab plate to the second side plate.
  • the distance 12 may be substantially equal to the distance from the second tab plate to the third side plate 13 .
  • the second tab 22 and the second tab plate formed by the fourth connecting portions 222 of the plurality of second tabs 22 do not protrude from the battery core 2
  • the outer edge of the second tab 22 specifically, the distance from the fourth connection portion 222 / second tab plate of the second tab 22 to the second side plate 12 may be greater than or equal to the distance from the battery core 2 to the second side plate 12 .
  • the distance from the fourth connecting portion 222/second tab plate of the tab 22 to the third side plate 13 may be greater than or equal to the distance from the battery core 2 to the third side plate 13 .
  • the projection of the fourth connecting piece 32' connected to the fourth connecting portion 222/the second lug plate on the first side plate 11 is at least partially located within the projection of the battery core 2 on the first side plate 11, which can reduce the problem.
  • the small cavity wastes space in the direction from the second side plate 12 to the third side plate 13 and improves the energy density and other performance of the battery.
  • the fourth connecting piece 32' is disposed on the side of the fourth connecting portion 222/second tab plate facing the second side plate 12 as an example, along the fourth connecting portion 222/second tab plate to the third In the direction of the two side plates 12, the fourth connecting piece 32' extends at least partially between the fourth connecting portion 222/the second tab plate and the side of the battery core 2 facing the second side plate 12 (i.e., the fourth connecting piece 32' extends to the fourth connecting portion 222/second lug plate and the side of the battery core 2 facing the second side plate 12, and the projection on the first side plate 11 is located on the battery core. 2 within the projection on the first side plate 11) to be connected with the fourth connecting portion 222/second lug plate (but not in contact with the extending portion 23).
  • the extension portion 23 may be level with the second tab plate/second tab 21 , or the extension portion 23 may be larger than the second tab plate/
  • the second tab 21 is closer to the first side plate 11 , that is, the distance from the second tab plate/second tab 22 to the first side plate 11 is equal to or greater than the distance from the extension 23 to the first side plate 11 , so that It is beneficial to further improve the energy density of the battery. But it is not limited thereto.
  • the second tab plate/second tab 22 may be closer to the first side plate 11 than the extension 23 , that is, the second tab plate/second tab 22 is
  • the distance between the first side plate 11 is less than the distance from the extension 23 to the first side plate 11 , that is, in the direction from the battery core 2 to the first side plate 11 , the second tab plate/second tab 22
  • the end far away from the battery core 2 is located between the extension 23 and the first side plate 11, which is relatively more conducive to the connection between the second tab 22/the second tab plate and the fourth connecting piece 32', increasing the contact area between the two and improving the efficiency of the connection. stability.
  • the projection of the second guide member 3' on the second side panel 12 does not overlap with the projection of the extension portion 23 on the second side panel 12, that is, the projection of the third connecting piece 31' on the second side panel 12.
  • the projection of the fourth connecting piece 32' on the second side panel 12 does not overlap with the projection of the extension portion 23 on the second side panel 12 respectively.
  • the battery also includes a second external connection piece 41' provided on the side of the first side plate 11 away from the cavity.
  • the second external connection piece 41' includes a second pole formed by protruding outwards.
  • the first side plate 11 is provided with There is a seventh through hole 120 provided corresponding to the second pole, and the second pole is connected to the third connecting piece 31' through the seventh through hole 120.
  • the third connecting piece 31' includes a fifth through hole 30' corresponding to the second pole.
  • the second pole penetrates the first side plate 11 (ie, passes through the seventh through hole 120) and passes through the fifth through hole 30'.
  • the through hole 30' is connected to the third connecting piece 31'.
  • the second pole passes through the seventh through hole 120 to penetrate the first side plate 11.
  • the seventh through hole 120 and the fifth through hole 30' can be coaxially arranged.
  • the cross-section of the second pole perpendicular to the axial direction of the second pole is circular.
  • the second pole can be cylindrical, or the second pole has a tapered structure, that is, along the In the direction from the first side plate 11 to the third connecting piece 31', the diameter of the second pole shows an increasing or decreasing trend.
  • the diameter of the second pole is the axial direction of the second pole perpendicular to the second pole. The diameter of the cross section.
  • the diameter of the second pole shows a changing trend (i.e., increases or decreases) in the direction from the first side plate 11 to the third connecting piece 31'.
  • the change may be a gradual change, that is, a uniform increase or decrease with substantially the same amplitude.
  • the aperture (diameter) of the seventh through hole 120 and the fifth through hole 30' changes correspondingly with the diameter of the second pole, for example, along the direction from the first side plate 11 to In the direction of the third connecting piece 31', the diameter of the second pole gradually increases.
  • the diameters of the seventh through hole 120 and the fifth through hole 30' also gradually increase; along the direction from the first side plate 11 to the third In the direction of the connecting piece 31', the diameter of the second pole gradually decreases. At this time, the diameters of the seventh through hole 120 and the fifth through hole 30' also gradually decrease.
  • the fifth through hole 30' of the third connecting piece 31' includes a third hole section and a fourth hole section connected to each other, and the fourth hole section is located on the side of the third hole section close to the battery core 2; One end of the second pole close to the battery core 2 extends outward to form a second extension portion corresponding to the fourth hole section.
  • the third hole section and the fourth hole section can be arranged coaxially, the third hole section and the fourth hole section are both circular through holes, and the diameter of the fourth hole section is larger than that of the third hole section and the fourth hole section.
  • the diameter of the connected end preferably, the diameter of the fourth hole segment is larger than the diameter of the third hole segment, and the axial projection of the fourth hole segment perpendicular to the fifth through hole 30' can cover the third hole segment perpendicular to the fifth through hole 30'. Axial projection of through hole 30'.
  • the cross-sectional area of the second external piece 41' perpendicular to the axial direction of the second pole may be larger than the cross-sectional area of the second pole perpendicular to the axial direction of the second pole.
  • the second external piece 41' is perpendicular to the axial direction of the second pole.
  • the axial projection of the second pole covers the axial projection of the second pole perpendicular to the second pole, and the cross-sectional area of the second extension perpendicular to the second pole is larger than the second pole perpendicular to the second pole.
  • the axial cross-sectional area, the projection of the second extension perpendicular to the axial direction of the second pole covers the projection of the second pole perpendicular to the axial direction of the second pole, and the second external piece 41' is perpendicular to the second pole
  • the axial cross-sectional area of the column is larger than the cross-sectional area of the second extension perpendicular to the axial direction of the second pole, and the projection of the second external piece 41' perpendicular to the axial direction of the second pole covers the second extension perpendicularly.
  • the cross-sectional area of the second extension perpendicular to the axial direction of the second pole is substantially equal to the fourth hole section perpendicular to the axial direction of the second pole (also the fifth through hole).
  • the second extension is engaged with the fourth hole section and connected with the side wall of the fourth hole section.
  • an end surface of the second pole close to the battery core 2 is flush with a side surface of the third connecting piece 31' close to the battery core 2.
  • the thickness of the second extension portion along the axial direction of the fifth through hole 30' is substantially equal to the depth of the fourth hole segment along the axial direction of the fifth through hole 30', whereby the second extension portion snaps into place on the fourth through hole 30'.
  • an end surface of the second extension portion close to the battery core 2 is flush with a side surface of the third connecting piece 31 ′ facing the battery core 2 .
  • one end of the second pole close to the battery core 2 protrudes from the fifth through hole 30', and extends outward along the circumferential direction of the fifth through hole 30' to be close to the third connecting piece 31'.
  • the second extension portion connected to one side surface of the battery core 2, that is, the end surface of the second pole close to the battery core 2 is not flush with the side surface of the third connecting piece 31' facing the battery core 2, but is located on the third connecting piece 31'. Between the three connecting pieces 31' and the battery core 2.
  • the second external connecting piece 41', the second pole, and the second extension part can be integrally formed, and they can be made of metal.
  • the third connecting piece 31' and the first side plate 11 can be riveted through rivets. , after riveting, the rivet is located at one end of the first side plate 11 away from the cavity to form the second external piece 41', the other end forms the second extension, and the part between the two ends forms the second pole, forming
  • the second pole is, for example, a conical structure.
  • the second tab 22 can be electrically connected to the housing 1.
  • the second external connecting piece 41', the second pole, and the third connecting piece 31' of the second conductive member 3' can be directly connected to the housing 1.
  • the fourth connecting piece 32' of the second transition is welded to the second side plate 12 (or the third side plate 13) of the housing 1 (the third connecting piece 31' may not be provided , and the second external piece 41', etc.).
  • the second tab 22 and the housing 1 may also be insulatedly connected. Specifically, they may be insulated by providing an insulating sheet (insulating layer).
  • a third insulating piece 5' is disposed between the second external piece 41' and the first side plate 11, and the second conductive member 3' and There is also a fourth insulating sheet 6' between the first side plates 11.
  • the second pole penetrates the third insulating sheet 5' and the fourth insulating sheet 6'.
  • the fourth insulating piece 6' can be specifically located between the third connecting piece 31' and the first side plate 11, that is, the second external connecting piece 41', the third insulating piece 5', the first side plate 11, the fourth insulating piece
  • the piece 6' and the third connecting piece 31' are stacked in sequence.
  • the difference between the diameter of the fifth through hole 30' and the diameter of the pole is substantially equal to the width of the second insulating layer along the circumferential direction of the fifth through hole 30'.
  • the circumferential direction of the through hole 30' is perpendicular to the axial direction of the fifth through hole 30'.
  • the second insulating layer may be integrally formed with the third insulating sheet 5 ′, and the second insulating layer protrudes outward from the side of the third insulating sheet 5 ′ close to the first side plate 11 (into the seventh through hole 120 protrusions); alternatively, the second insulating layer can be integrally formed with the fourth insulating sheet 6', and the second insulating layer protrudes outward (toward the seventh side) from the side of the fourth insulating sheet 6' close to the first side plate 11.
  • the through hole 120 is formed with an inner protrusion).
  • the third insulating sheet 5' is provided with an eighth through hole 50', and the second pole passes through the eighth through hole 50' to achieve penetration of the third insulating sheet 5'; the fourth insulating sheet 6' is provided with The second pole passes through the sixth through hole 60' to penetrate the fourth insulating sheet 6'.
  • the second pole passes through the eighth through hole 50', the seventh through hole 120, the sixth through hole 60', and the fifth through hole 30' in order to achieve connection with the second conductive member 3'.
  • the eighth through hole 50', the seventh through hole 120, the sixth through hole 60', and the fifth through hole 30' can be Coaxial setup.
  • the projection of the third insulating sheet 5' on the first side panel 11 can cover the projection of the second external sheet 41' on the first side panel 11 (that is, the projection of the second external sheet 41' on the first side panel 11 The projection is located within the projection of the third insulating sheet 5' on the first side panel 11).
  • the projection of the fourth insulating sheet 6' on the first side plate 11 can cover the projection of the third connecting piece 31' on the first side plate 11, thereby further improving battery safety and stability.
  • the fourth insulating sheet 6' may be an L-shaped structure, which includes a third insulating part 61' and a fourth insulating part 62'; the third insulating part 61' is located between the first side plate 11 and the second conductor 3 ', the second pole penetrates the third insulating part 61' (that is, the sixth through hole 60' is provided on the third insulating part 61'); the fourth insulating part 62' is located between the second side plate 12 and the second Between the conductive members 3', specifically between the second side plate 12 and the fourth connecting piece 32', that is, the second side plate 12, the fourth insulating part 62', and the fourth connecting piece 32' are stacked in sequence. Therefore, the fourth insulating portion 62' can provide support for the second conductive member 3', and can insulate the second conductive member 3' from the second side plate 12 of the housing 1, thereby improving the battery's performance. performance such as security and stability.
  • the projection of the third insulating part 61' on the first side plate 11 covers the projection of the second conductor 3' on the first side plate 11 (covers the projection of the third connecting piece 31' on the first side plate 11 Projection)
  • the projection of the fourth insulating portion 62' on the second side plate 12 covers the projection of the second conductor 3' on the second side plate 12 (covers the fourth connecting piece 32' on the second side plate 12 projection).
  • an included angle is formed between the surface of the third insulating part 61' and the third connecting piece 31' and the surface of the fourth insulating part 62' and the fourth connecting piece 32'.
  • the range of the included angle can be It is 80° to 140°, such as 80°, 90°, 100°, 110°, 120°, 130°, 140°, etc., that is, the two are not parallel, such as perpendicular.
  • the included angle formed between the third insulating part 61' and the fourth insulating part 62' (the plane where they are located) may range from 80° to 140°, such as 80°, 90°, 100°, 110°, 120°, 130°, 140°, etc., that is, the two are not parallel, such as perpendicular.
  • first tab plate and the second connecting piece 32 can be welded, and the second tab plate and the fourth connecting piece can be welded.
  • the battery may also include a buffer piece 9 , which is located between the battery core 2 and the first side plate 11 , specifically between the extension part 23 and the first side plate 11 , and between the first connecting piece 31 and the first side plate 11 .
  • a buffer piece 9 which is located between the battery core 2 and the first side plate 11 , specifically between the extension part 23 and the first side plate 11 , and between the first connecting piece 31 and the first side plate 11 .
  • the buffer sheet can also play an insulating role.
  • the buffer sheet 9 includes a connected first buffer part 91 and a second buffer part 92.
  • the first buffer part 91 is located between the extension part 23 and the first side plate 11
  • the second buffer part 92 is located between the first side plate 11 and the extension part 23. between the first connecting portion 211 of the pole lug 21 and the first connecting piece 31 of the first conductive member.
  • the buffer piece 9 also includes a third buffer part 93 connected to the first buffer part 91.
  • the third buffer part is located between the third connecting part 221 of the second tab 22 and the third connecting piece of the second conductor 3'. Between 31'.
  • the width of the first buffer portion 91 is greater than or equal to the width of the second buffer portion 92
  • the width of the first buffer portion 91 is greater than or equal to the width of the third buffer portion 93
  • the width of the second buffer portion 92 is the same as that of the third buffer portion 93 .
  • the widths of portions 93 may be equal or unequal.
  • the width of the first buffer portion 91 , the width of the second buffer portion 92 , and the width of the third buffer portion 93 refer to the width in the direction from the third side plate 13 to the second side plate 12 .
  • the second buffer portion 92 is provided with a first groove, and the second connecting portion 212 of the first tab 21 extends into the first groove.
  • a first groove extends from the end of the second connecting portion 212 of the first tab 21 to facilitate connection with the battery core 2 .
  • the first conductor is connected.
  • the projection of the first buffer portion 91 in the thickness direction of the battery core 2 (that is, the projection is perpendicular to the thickness direction of the battery core 2) is in contact with the second connecting portion 212 of the first tab 21 and the first conductive member ( The projected portions of the second connecting piece 32) in the thickness direction of the battery core 2 overlap.
  • the length of the first groove in the width direction of the battery core 2 is greater than or equal to the length of the second connecting portion 212 of the first tab 21 in the width direction of the battery core 2 .
  • the length of the first groove in the thickness direction of the battery core 2 is greater than or equal to the length of the second connecting portion 212 of the first tab 21 in the thickness direction of the battery core 2 .
  • the third buffer portion 93 is provided with a second groove, and the fourth connecting portion 222 of the second tab 22 extends into the second groove.
  • a second groove extends from the end of the fourth connecting portion 222 of the second tab 22 to facilitate connection with the second conductive member 3'.
  • the second connecting portion 212/the side of the first lug plate away from the second side plate that is, between the second connecting portion 212/the first lug plate and the third side plate 13
  • the second connecting portion 212 /There is a second buffer portion 92 on at least one side of the first lug plate facing the second side plate (ie, the second connecting portion 212/between the first lug plate and the second side plate 13), and the fourth The connecting portion 222/the side of the second lug plate facing away from the second side plate (i.e.
  • the side of the fourth connection part 222/the second tab plate facing the second side plate that is, the fourth connection part 222/the second
  • the projection of the third buffer portion 93 in the thickness direction of the battery core 2 is in line with the fourth connecting portion 222 of the second tab 22 and the second conductive member 3' (fourth connecting piece 32') of the battery core 2.
  • the projections in the thickness direction partially overlap.
  • the length of the second groove in the width direction of the battery core 2 is greater than or equal to the length of the fourth connecting portion 222 of the second tab 22 in the width direction of the battery core 2 .
  • the length of the second groove in the thickness direction of the battery core 2 is greater than or equal to the length of the fourth connecting portion 222 of the second tab 22 in the thickness direction of the battery core 2 .
  • the length of the second groove in the width direction of the battery core 2 may be equal to or different from the length of the first groove in the width direction of the battery core 2
  • the length of the second groove in the thickness direction of the battery core 2 The length may be equal to or different from the length of the first groove in the thickness direction of the battery core 2 .
  • the width of the battery core 2 is a
  • the length of the buffer sheet 9 in the width direction of the battery core 2 is b, 0 ⁇
  • the battery core 2 has a first surface and a second surface that are oppositely arranged, and a side surface located between the first surface and the second surface.
  • a first protective glue layer is provided on at least part of the side surface of at least one side of the battery core 2 71.
  • the side surface between the first surface and the second surface of the battery core 2 is the side surface that exposes the outer edge of the pole piece in the battery core 2 , and is composed of a plurality of stacked vertical pole pieces. It is formed on the end surface in the thickness direction, that is, the side surface of the battery core 2 is parallel to the thickness direction of the battery core 2 (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).
  • the side of the tab 21 and the second tab 22 is also the side of the battery core 2 facing the first side plate 11), the second side and the fourth side are located on opposite sides of the first side (or the third side).
  • One side and the third side are located on opposite sides of the second side (or the fourth side).
  • 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 .
  • the first protective glue layer 71 is provided with the first protective glue layer 71, that is, one or more (such as all) of them are provided with the first protective glue layer 71, but not Limited to this, a first protective glue layer 71 may also be provided on the first side.
  • the number of the first protective glue layer 71 on any side of the battery core 2 may be one or more.
  • the number of the first protective glue layer 71 on any side of the battery core 2 may be one.
  • the length of 71 along the length direction of the side may not be greater than the length of the side, for example, substantially equal; when the number of first protective glue layers 71 on any one side is multiple, the plurality of first protective glue layers 71 are arranged at intervals.
  • there is a gap between any two adjacent first protective adhesive layers 71 facilitates the electrolyte to infiltrate into the pole pieces in the battery core 2, further optimizing battery performance.
  • the length of the first protective glue layer 71 on the second side in the length direction of the second side may not be greater than that of the second side.
  • the length is, for example, substantially equal to the length of the second side; when the number of the first protective glue layers 71 on the second side is multiple, the plurality of first protective glue layers 71 can be distributed at intervals on the second side.
  • the first protective adhesive layer 71 extends to the first side of the battery core 2 and is bonded to the pole pieces located on the first side of the battery core 2 and/or extends to the second side of the battery core 2 and is bonded to the second side of the battery core 2 .
  • the pole pieces located on the second side of the battery core 2 are bonded. This prevents the exposed pole pieces from the side of the battery core 2 from contacting the case 1.
  • the battery core 2 can be fixed, improving the safety and stability of the battery. .
  • the first protective glue layer 71 may be provided with one or more ninth through holes, preferably a plurality of fifth through holes 30', and the plurality of fifth through holes 30' may be evenly or unevenly distributed in the first protective glue layer 71.
  • the first protective glue layer 71 on this side may be provided with one or more fifth through holes 30'.
  • a second protective glue layer 72 is provided on the first surface of the extension part 23 and/or the second surface of the extension part 23 .
  • the direction from the first surface of the extension part 23 to the second surface of the extension part 23 may be perpendicular to the direction from the first tab 21 to the extension part 23 .
  • the first protective adhesive layer 71 and the second protective adhesive layer 72 may be adhesive paper, which generally has insulation and viscosity. It may be conventional adhesive paper in this field, and is not particularly limited.
  • first tab 21 and the second tab 22 are disposed on the end surface of the battery core 2 facing the first side plate 11 , and the first surface of the battery core 2 and the second surface of the battery core 2 are respectively located on 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 thickness direction of the electrode sheet).
  • One side (surface), the second side (surface) of the battery core 2 and the surface of the pole piece can be parallel (perpendicular to the thickness direction of the pole piece).
  • the pole piece located on the first side of the battery core 2 and the pole piece located on the second side of the battery core 2 are respectively the outermost pole pieces of the battery core 2 , that is, the remaining pole pieces are stacked on the first side of the battery core 2 between the pole piece and the pole piece located on the second side of the battery core 2 .
  • the polarity of the electrode piece located on the first side of the battery core 2 and the polarity of the electrode piece located on the second side of the battery core 2 may be the same or different. They may be the positive electrode piece or the negative electrode piece, and may be the first pole piece or the second pole piece. , it is generally preferred that the pole piece located on the first side of the battery core 2 and the pole piece located on the second side of the battery core 2 are negative electrode pieces.
  • 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 pole piece, The separator and the second electrode sheet are stacked in sequence and then rolled; the laminated battery core 2 is specifically formed by the first electrode sheet, the separator, and the second electrode sheet being stacked in sequence.
  • the battery 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, and a sixth side plate 16.
  • the first side plate 11, The fourth side plate 14, the fifth side plate 15, and the sixth side plate 16 are connected in sequence, and are respectively located between the second side plate 12 (or bottom plate) and the third side plate 13 (or cover plate).
  • a sealed cavity is formed, and the battery core 2 is placed in the cavity.
  • the first side plate 11 and the fifth side plate 15 are located on opposite sides of the fourth side plate 14 (or the sixth side plate 16 ).
  • the fourth side plate 14 and the sixth side plate 16 are located on the first side plate 11 (or the sixth side plate 16 ).
  • the third side panel 13 and the second side panel 12 are respectively located on the first side panel 11 (or the fourth side panel 14, or the fifth side panel 15, or the sixth side panel 16). opposite sides of.
  • the direction of the third side plate 13 to the second side plate 12 is the thickness direction of the casing 1
  • the direction of the first side plate 11 to the fifth side plate 15 can be the length direction of the casing 1
  • the direction of the sixth side plate 16 is the width direction of the casing 1
  • the direction of the first to fifth side plates 11 to 15 is the width direction of the casing 1
  • the fourth to sixth side plates 14 to 16 are 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 third side plate 13
  • the other is the side of the battery core 2 facing the second side plate 12 .
  • arc transition portions 17 can be passed between the first side plate 11 and the fourth side plate 14 , between the fourth side plate 14 and the fifth side plate 15 , and between the fifth side plate 15 and the sixth side plate 16 . connected, i.e. adjacent The connection between the two 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 third side plate 13 to the second side plate 12 (that is, the thickness direction of the housing 1).
  • the case 1 can also be provided with a thinned portion 131.
  • the mechanical strength of the thinned portion 131 is smaller than the mechanical strength of other parts of the case 1 except the thinned portion 131. Therefore, when the internal pressure of the battery is too high, priority can be given to The pressure is released through the thinned portion 131 to avoid battery explosion and other phenomena.
  • a thinned portion 131 may be provided on the third side plate 13 .
  • the thickness of the thinned portion 131 is smaller than the thickness of other portions of the housing 1 except the thinned portion 131 .
  • the housing 1 is also provided with a liquid injection hole 100 and a sealing sheet for sealing the liquid injection hole 100.
  • the liquid injection hole 100 is used 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 may include a metal sheet, which may be welded to the housing 1 around the liquid injection hole 100 to seal the liquid injection hole 100 .
  • the liquid injection hole 100 can be provided on the first side plate 11, specifically, it can be located at the joint between the first side plate 11 and the second guide member 3' (or the first external piece 41) and the first side plate. Between the connecting portion of 11 and the first guide piece (or the second external piece 41'), the sealing piece can be welded to the side of the first side plate 11 away from the cavity. Specifically, it can be welded to the position where the first side plate 11 is located. The portion around the liquid injection hole 100 is used to seal the liquid injection hole 100 .
  • the welding as described above may specifically be laser welding.
  • 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 conductive member and the material of the first tab 21 can be materials of the same polarity.
  • the first tab 21 is a positive tab
  • the material of the first conductor and the material of the first tab 21 They can be aluminum or aluminum alloy respectively, and their specific material types can be the same or different.
  • the material of the second guide member 3', the second The material of the pole tab 22 can be a material of the same polarity.
  • the second pole tab 22 is a negative pole tab.
  • the materials of the second conductive member 3' and the second pole tab 22 can be nickel, iron or nickel-iron alloy respectively.
  • the specific material types can be the same or different.

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  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

The present invention provides a battery, comprising: a housing, enclosing a cavity, the housing comprising a first side plate; and a cell, located in the cavity. The side of the cell facing the first side plate is provided with a first tab and an extension portion extending to the first side plate, and the distance between the side of the first tab connected to the cell and the first side plate is greater than the distance between the extension portion and the first side plate. The present invention can improve the performances such as energy density of the battery.

Description

电池Battery 技术领域Technical field
本发明涉及电化学储能装置领域，具体涉及一种电池。The invention relates to the field of electrochemical energy storage devices, and in particular to a battery.
背景技术Background technique
目前，以电池为代表的电化学装置受到广泛应用，例如，锂离子电池具有容量大、体积小、重量轻和绿色环保等优点，已广泛应用于数码电子产品和电动汽车等行业中。随着科技发展，对电池的能量密度等性能的要求也越来越高，因此，亟待提高电池的能量密度等性能。At present, electrochemical devices represented by batteries are widely used. For example, 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. With the development of science and technology, the requirements for battery energy density and other performance are getting higher and higher. Therefore, there is an urgent need to improve the energy density and other performance of batteries.
发明内容Contents of the invention
本发明提供一种电池，能够提高电池的能量密度等性能。The invention provides a battery that can improve the energy density and other properties of the battery.
本发明提供一种电池，包括：壳体，围设成腔体；所述壳体包括第一侧板；电芯，位于所述腔体内，所述电芯面向所述第一侧板的一侧设有第一极耳、以及向所述第一侧板延伸的延伸部，所述第一极耳与所述电芯相接的一侧至所述第一侧板的距离大于所述延伸部至所述第一侧板的距离。The invention provides a battery, which includes: a casing, which is surrounded by a cavity; the casing includes a first side plate; and a battery core is located in the cavity, and the battery core faces one side of the first side plate. A first pole is provided on one side and an extension extends toward the first side plate. The distance from the side where the first pole is connected to the battery core to the first side plate is greater than the extension. distance from the bottom to the first side plate.
根据本发明的一实施方式，所述第一极耳在所述第一侧板上的投影与所述延伸部在所述第一侧板上的投影不重叠。According to an embodiment of the present invention, the projection of the first tab on the first side plate does not overlap with the projection of the extension part on the first side plate.
根据本发明的一实施方式，所述电池还包括与所述第一侧板相连的第六侧板，所述第一极耳在所述第六侧板上的投影与所述延伸部在所述第六侧板上的投影至少部分重叠。According to an embodiment of the present invention, the battery further includes a sixth side plate connected to the first side plate, and the projection of the first tab on the sixth side plate is consistent with the position of the extension portion. The projections on the sixth side panel at least partially overlap.
根据本发明的一实施方式，所述电池还包括位于所述腔体内的第一导接件，所述第一导接件与所述第一极耳电连接；所述第一导接件包括第二连接片，所述第一极耳包括与所述第二连接片相接的第二连接部。According to an embodiment of the present invention, the battery further includes a first conductive member located in the cavity, and the first conductive member is electrically connected to the first tab; the first conductive member includes and a second connecting piece. The first tab includes a second connecting portion connected to the second connecting piece.
根据本发明的一实施方式，所述电芯包括多个层叠设置的极片，所述第一极耳的第二连接部与所述第一导接件的第二连接片相接的一面和所述极片的延伸方向基本平行。According to an embodiment of the present invention, the battery core includes a plurality of pole pieces arranged in a stack, and a side of the second connecting portion of the first pole tab connected to the second connecting piece of the first conductive member and The extending directions of the pole pieces are substantially parallel.
根据本发明的一实施方式，所述电池还包括与所述第一极耳电连接的第 一导接件，所述第一导接件位于所述腔体内，所述第一导接件包括第二连接片；所述壳体包括与所述第一侧板相连的第二侧板，所述第一极耳包括相连的第一连接部和第二连接部，所述第一连接部与所述电芯连接，其中，所述第二连接部背离所述第二侧板的一侧与所述第二连接片连接；或者，所述第二连接部面向所述第二侧板的一侧与所述第二连接片连接。According to an embodiment of the present invention, the battery further includes a third terminal electrically connected to the first tab. A guide piece, the first guide piece is located in the cavity, the first guide piece includes a second connecting piece; the housing includes a second side plate connected to the first side plate, The first tab includes a connected first connection part and a second connection part. The first connection part is connected to the battery core, wherein the second connection part is on a side facing away from the second side plate. Connected to the second connecting piece; or, the side of the second connecting portion facing the second side plate is connected to the second connecting piece.
根据本发明的一实施方式，所述电芯包括依次层叠设置的第一极片、第二极片以及位于所述第一极片和第二极片之间的隔膜，所述第一极耳设置在所述第一极片上；多个所述第一极耳的第二连接部依次贴合组成第一极耳板，所述第一极耳板与所述第一导接件连接。According to an embodiment of the present invention, the battery core includes a first pole piece, a second pole piece, and a separator located between the first pole piece and the second pole piece that are stacked in sequence. The first pole tab Disposed on the first pole piece; the second connecting portions of the plurality of first pole tabs are sequentially attached to form a first pole plate, and the first pole plate is connected to the first conductive member.
根据本发明的一实施方式，所述壳体包括与所述第一侧板相连的第二侧板和第三侧板，所述第二侧板与所述第三侧板相对设置；所述第一极耳的第二连接部朝向靠近所述第二侧板的方向贴合，形成所述第一极耳板，或者，所述第一极耳的第二连接部朝向靠近所述第三侧板的方向贴合，形成所述第一极耳板，或者，所述第一极耳的第二连接部朝向所述电芯的厚度方向上的中心线贴合，形成所述第一极耳板。According to an embodiment of the present invention, the housing includes a second side plate and a third side plate connected to the first side plate, and the second side plate is opposite to the third side plate; The second connecting portion of the first tab is laminated toward the second side plate to form the first tab plate, or the second connecting portion of the first tab is oriented toward the third side plate. The side plates are bonded in the direction to form the first tab plate, or the second connecting portion of the first tab is bonded toward the centerline in the thickness direction of the battery core to form the first pole. ear plate.
根据本发明的一实施方式，沿所述电芯至所述第一侧板的方向，所述第一极耳板至所述第一侧板的距离大于或等于所述延伸部至所述第一侧板的距离。According to an embodiment of the present invention, along the direction from the battery core to the first side plate, the distance from the first tab plate to the first side plate is greater than or equal to the distance from the extension part to the third side plate. The distance between the side panels.
根据本发明的一实施方式，所述第一导接件还包括与所述第二连接片相连的第一连接片，所述第一连接片位于所述第一侧板与所述第一极耳的第一连接部之间；和/或，所述第二连接片位于所述第二侧板与所述第一极耳的第二连接部之间；和/或，所述第一连接部与所述电芯相接的一面和所述第二连接部与所述第二连接片相接的一面之间形成有第一夹角，所述第一夹角的范围为80-120°。According to an embodiment of the present invention, the first conductive member further includes a first connecting piece connected to the second connecting piece, and the first connecting piece is located between the first side plate and the first pole. between the first connecting portions of the ears; and/or, the second connecting piece is located between the second side plate and the second connecting portion of the first tab; and/or, the first connecting piece A first included angle is formed between the surface of the second connection portion and the battery core, and the surface of the second connection portion and the second connecting piece. The range of the first included angle is 80-120°. .
根据本发明的一实施方式，所述第一连接片所在平面和所述第二连接片所在平面之间形成有第二夹角，所述第二夹角的范围为80-120°。According to an embodiment of the present invention, a second included angle is formed between the plane where the first connecting piece is located and the plane where the second connecting piece is located, and the range of the second included angle is 80-120°.
根据本发明的一实施方式，所述第一极耳的第二连接部至所述第二侧板的距离大于或等于所述电芯至所述第二侧板的距离。According to an embodiment of the present invention, the distance from the second connection part of the first tab to the second side plate is greater than or equal to the distance from the battery core to the second side plate.
根据本发明的一实施方式，所述电池还包括与所述第一极耳电连接的第一导接件，所述第一导接件位于所述腔体内；所述壳体还包括第二侧板，所 述第一导接件在第二侧板上的投影与所述延伸部在所述第二侧板上的投影不重叠。According to an embodiment of the present invention, the battery further includes a first conductor electrically connected to the first tab, and the first conductor is located in the cavity; the housing further includes a second conductor. side panel, so The projection of the first guide member on the second side plate does not overlap with the projection of the extension portion on the second side plate.
根据本发明的一实施方式，所述电池还包括与所述第一极耳电连接的第一导接件，所述第一导接件位于所述腔体内，所述第一导接件包括第一连接片；所述电池还包括设置在所述第一侧板背离所述腔体的一侧的第一外接片，所述第一外接片包括向外凸起形成的第一极柱，所述第一连接片包括与所述第一极柱对应设置的第一通孔，所述第一极柱穿透所述第一侧板、并通过所述第一通孔与所述第一连接片相接。According to an embodiment of the present invention, the battery further includes a first conductive member electrically connected to the first tab, the first conductive member is located in the cavity, and the first conductive member includes a first connecting piece; the battery further includes a first external connecting piece provided on the side of the first side plate facing away from the cavity, the first external connecting piece includes a first pole formed by protruding outwards, The first connecting piece includes a first through hole corresponding to the first pole. The first pole penetrates the first side plate and connects to the first pole through the first through hole. The connecting pieces are connected.
根据本发明的一实施方式，所述第一连接片的第一通孔包括相互连接的第一孔段和第二孔段，所述第二孔段位于所述第一孔段靠近所述电芯的一侧；所述第一极柱靠近所述电芯的一端向外延伸形成有与所述第二孔段对应设置的第一外延部。According to an embodiment of the present invention, the first through hole of the first connecting piece includes a first hole section and a second hole section connected to each other, and the second hole section is located near the first hole section and close to the electrical circuit. One side of the core; one end of the first pole close to the battery core extends outward to form a first extension portion corresponding to the second hole section.
根据本发明的一实施方式，所述第一极柱的靠近电芯的一端面与所述第一连接片的靠近电芯的一侧表面齐平。According to an embodiment of the present invention, an end surface of the first pole close to the battery core is flush with a side surface of the first connecting piece close to the battery core.
根据本发明的一实施方式，所述第一极柱靠近所述电芯的一端伸出所述第一通孔、并沿所述第一通孔的周向向外延伸形成有与所述第一连接片靠近所述电芯的一侧表面相接的第一外延部。According to an embodiment of the present invention, one end of the first pole close to the battery core extends out of the first through hole, and extends outward along the circumferential direction of the first through hole to form a hole connected to the first through hole. A connecting piece is close to the first extension portion in contact with one side surface of the battery core.
根据本发明的一实施方式，所述第一外接片与所述第一侧板之间还设有第一绝缘片，所述第一导接件与所述第一侧板之间还设有第二绝缘片，所述第一极柱穿透所述第一绝缘片和第二绝缘片；和/或，所述第一极柱与所述第一侧板之间设有第一绝缘层。According to an embodiment of the present invention, a first insulating piece is further provided between the first external piece and the first side plate, and a first insulation piece is further provided between the first conductor and the first side plate. a second insulating sheet, the first pole penetrates the first insulating sheet and the second insulating sheet; and/or a first insulating layer is provided between the first pole and the first side plate .
根据本发明的一实施方式，所述第一绝缘片在所述第一侧板上的投影覆盖所述第一外接片在所述第一侧板上的投影。According to an embodiment of the present invention, the projection of the first insulating sheet on the first side panel covers the projection of the first external connecting sheet on the first side panel.
根据本发明的一实施方式，所述壳体还包括与所述第一侧板相连的第二侧板，所述第二绝缘片包括第一绝缘部和第二绝缘部；所述第一绝缘部位于所述第一侧板与所述第一导接件之间，所述第一极柱穿透所述第一绝缘部；所述第二绝缘部位于所述第二侧板与所述第一导接件之间。According to an embodiment of the present invention, the housing further includes a second side plate connected to the first side plate, and the second insulation sheet includes a first insulation part and a second insulation part; the first insulation The first pole is located between the first side plate and the first conductor, and the first pole penetrates the first insulating part; the second insulating part is located between the second side plate and the first conductor. between the first conductors.
根据本发明的一实施方式，所述第二绝缘部在第二侧板上的投影覆盖第一导接件在第二侧板上的投影，和/或，所述第一绝缘部在所述第一侧板上的投影覆盖所述第一导接件在所述第一侧板上的投影。 According to an embodiment of the present invention, the projection of the second insulating part on the second side plate covers the projection of the first conductive member on the second side plate, and/or the first insulating part is on the second side plate. The projection on the first side panel covers the projection of the first guide member on the first side panel.
根据本发明的一实施方式，所述延伸部的数量为至少两个，所述第一极耳位于两个相邻的所述延伸部之间；和/或，所述延伸部在所述电芯厚度方向上的长度等于所述电芯的厚度。According to an embodiment of the present invention, the number of the extension parts is at least two, and the first tab is located between two adjacent extension parts; and/or, the extension part is on the electrical The length in the core thickness direction is equal to the thickness of the battery core.
根据本发明的一实施方式，所述电芯面向所述第一侧板的一侧还设有第二极耳，所述第二极耳与所述第一极耳极性相反。According to an embodiment of the present invention, a second tab is further provided on a side of the battery core facing the first side plate, and the second tab has an opposite polarity to the first tab.
根据本发明的一实施方式，所述第二极耳与所述电芯相接的一侧至所述第一侧板的距离大于所述延伸部至所述第一侧板的距离；和/或，所述电池还包括与所述第二极耳电连接的第二导接件，所述第二导接件位于所述腔体内；所述第二导接件包括第三连接片和第四连接片，所述第三连接片位于所述第一侧板与所述第二极耳之间，所述第二极耳包括与所述第四连接片相接的第四连接部；和/或，所述电池还包括与所述第二极耳电连接的第二导接件，所述第二导接件位于所述腔体内；所述第二导接件包括第四连接片，所述第二极耳包括与所述第四连接片相接的第四连接部；所述电芯包括多个层叠设置的极片，所述第二极耳的第四连接部与所述第二导接件的第四连接片相接的一面和所述极片的延伸方向基本平行。According to an embodiment of the present invention, the distance from the side of the second tab connected to the battery core to the first side plate is greater than the distance from the extension part to the first side plate; and/ Or, the battery further includes a second conductive member electrically connected to the second tab, and the second conductive member is located in the cavity; the second conductive member includes a third connecting piece and a third Four connecting pieces, the third connecting piece is located between the first side plate and the second tab, the second tab includes a fourth connecting portion connected to the fourth connecting piece; and /Or, the battery further includes a second conductive member electrically connected to the second tab, the second conductive member is located in the cavity; the second conductive member includes a fourth connecting piece, The second tab includes a fourth connecting portion connected to the fourth connecting piece; the battery core includes a plurality of stacked pole pieces, and the fourth connecting portion of the second tab is connected to the third connecting piece. The connecting surface of the fourth connecting piece of the two conductive members is substantially parallel to the extending direction of the pole piece.
根据本发明的一实施方式，所述第二极耳与所述第一极耳之间存在所述延伸部；和/或，所述延伸部的数量为至少两个，所述第二极耳位于两个相邻的所述延伸部之间；和/或，所述第二极耳在所述第一侧板上的投影与所述延伸部在所述第一侧板上的投影不重叠；和/或，所述第二极耳在所述第一侧板上的投影与所述第一极耳在所述第一侧板上的投影不重叠；和/或，所述壳体还包括与所述第一侧板相连的第六侧板，所述第二极耳在所述第六侧板上的投影与所述延伸部在所述第六侧板上的投影至少部分重叠；和/或，所述壳体还包括与所述第一侧板相连的第六侧板，所述第二极耳在所述第六侧板上的投影与所述第一极耳在所述第六侧板上的投影至少部分重叠。According to an embodiment of the present invention, the extension portion is present between the second pole tab and the first pole tab; and/or the number of the extension portions is at least two, and the second pole tab Located between two adjacent extension parts; and/or, the projection of the second tab on the first side plate does not overlap with the projection of the extension part on the first side plate. ; and/or, the projection of the second pole on the first side plate does not overlap with the projection of the first pole on the first side plate; and/or, the housing also It includes a sixth side plate connected to the first side plate, and the projection of the second tab on the sixth side plate at least partially overlaps with the projection of the extension part on the sixth side plate; And/or, the housing further includes a sixth side plate connected to the first side plate, and the projection of the second pole on the sixth side plate is consistent with the projection of the first pole on the sixth side plate. The projections on the sixth side panel at least partially overlap.
根据本发明的一实施方式，所述电池还包括缓冲片，所述缓冲片位于所述延伸部与所述第一侧板之间。According to an embodiment of the present invention, the battery further includes a buffer piece located between the extension part and the first side plate.
根据本发明的一实施方式，所述电池还包括缓冲片，所述缓冲片包括相连的第一缓冲部和第二缓冲部，所述第一缓冲部位于所述延伸部与所述第一侧板之间，所述第二缓冲部位于所述第一极耳的第一连接部与所述第一导接件的第一连接片之间。 According to an embodiment of the present invention, the battery further includes a buffer piece, the buffer piece includes a connected first buffer part and a second buffer part, the first buffer part is located between the extension part and the first side Between the plates, the second buffer portion is located between the first connecting portion of the first tab and the first connecting piece of the first conductor.
根据本发明的一实施方式，所述第一缓冲部的宽度大于或等于所述第二缓冲部的宽度；和/或，所述第二缓冲部设有第一凹槽，所述第一极耳的第二连接部延伸至所述第一凹槽内。According to an embodiment of the present invention, the width of the first buffer part is greater than or equal to the width of the second buffer part; and/or the second buffer part is provided with a first groove, and the first pole The second connecting portion of the ear extends into the first groove.
根据本发明的一实施方式，所述第二缓冲部在所述电芯的厚度方向上的投影与所述第一极耳的第二连接部以及所述第一导接件在所述电芯的厚度方向上的投影部分重叠；和/或，所述第一凹槽的在所述电芯的宽度方向上的长度大于或等于所述第一极耳的第二连接部在所述电芯的宽度方向上的长度；和/或，所述第一凹槽的在所述电芯的厚度方向上的长度大于或等于所述第一极耳的第二连接部在所述电芯的厚度方向上的长度；和/或，沿所述电芯的长度方向，所述第一极耳的第二连接部的端部延伸出所述第一凹槽。According to an embodiment of the present invention, the projection of the second buffer portion in the thickness direction of the battery core is consistent with the projection of the second connecting portion of the first tab and the first conductor in the battery core. The projections in the thickness direction partially overlap; and/or, the length of the first groove in the width direction of the battery core is greater than or equal to the length of the second connection portion of the first tab in the battery core. The length in the width direction; and/or, the length of the first groove in the thickness direction of the battery core is greater than or equal to the thickness of the second connection portion of the first tab in the battery core The length in the direction; and/or, along the length direction of the battery core, the end of the second connecting portion of the first tab extends out of the first groove.
根据本发明的一实施方式，所述电芯的宽度为a，所述缓冲片在所述电芯的宽度方向上的长度为b，0≤|a-b|≤3。According to an embodiment of the present invention, the width of the battery core is a, and the length of the buffer sheet in the width direction of the battery core is b, 0≤|a-b|≤3.
根据本发明的一实施方式，所述电芯具有相对设置的第一面和第二面，以及位于所述第一面和第二面之间的侧面，在所述电芯的至少一侧的侧面的至少部分区域设有第一保护胶层。According to an embodiment of the present invention, the battery core has a first surface and a second surface that are oppositely arranged, and a side surface located between the first surface and the second surface, and at least one side of the battery core At least part of the side area is provided with a first protective adhesive layer.
根据本发明的一实施方式，所述电芯包括多个层叠设置的极片，所述电芯的侧面的第一保护胶层延伸至所述电芯的第一面并与位于所述电芯的第一面的极片粘结和/或延伸至所述电芯的第二面并与位于所述电芯的第二面的极片粘接。According to an embodiment of the present invention, the battery core includes a plurality of stacked pole pieces, and the first protective adhesive layer on the side of the battery core extends to the first surface of the battery core and is in contact with the battery core. The pole pieces on the first side are bonded and/or extended to the second side of the battery core and bonded to the pole pieces located on the second side of the battery core.
根据本发明的一实施方式，所述第一保护胶层的数量为多个，多个所述第一保护胶层间隔设置在所述电芯的侧面。According to an embodiment of the present invention, the number of the first protective adhesive layers is multiple, and the plurality of first protective adhesive layers are arranged at intervals on the side of the battery core.
根据本发明的一实施方式，所述延伸部具有相对的第一面和第二面，所述延伸部的第一面和/或所述延伸部的第二面设有第二保护胶层。According to an embodiment of the present invention, the extension part has an opposite first surface and a second surface, and the first surface of the extension part and/or the second surface of the extension part is provided with a second protective glue layer.
根据本发明的一实施方式，所述延伸部的第一面至所述延伸部的第二面的方向垂直于从所述第一极耳至所述延伸部的方向。According to an embodiment of the present invention, the direction from the first surface of the extension part to the second surface of the extension part is perpendicular to the direction from the first tab to the extension part.
根据本发明的一实施方式，所述第一极耳为正极耳或负极耳；和/或，所述电芯包括叠片式电芯或卷绕式电芯。According to an embodiment of the present invention, the first tab is a positive tab or a negative tab; and/or, the battery core includes a laminated battery core or a wound battery core.
本发明中，电芯设有第一极耳的一侧具有延伸部，第一极耳与电芯相接的一侧至第一侧板的距离大于延伸部至所述第一侧板的距离，由此可以避免由于设置第一极耳所造成的腔体空间的浪费，通过延伸部增大腔体内电芯的 功能区域的体积，从而提高电池的能量密度等性能。In the present invention, the side of the battery core with the first tab has an extension portion, and the distance from the side where the first tab is connected to the battery core to the first side plate is greater than the distance from the extension portion to the first side plate. , thereby avoiding the waste of cavity space caused by arranging the first tab, and increasing the capacity of the battery core in the cavity through the extension. The volume of the functional area thereby improves the energy density and other performance of the battery.
附图说明Description of drawings
图1为本发明一实施例的电池的结构示意图；Figure 1 is a schematic structural diagram of a battery according to an embodiment of the present invention;
图2为本发明一实施例的电芯的结构示意图；Figure 2 is a schematic structural diagram of a battery core according to an embodiment of the present invention;
图3为本发明一实施例的示出第一极柱的电池部分截面示意图；Figure 3 is a partial cross-sectional schematic diagram of a battery showing a first pole according to an embodiment of the present invention;
图4为本发明一实施例的示出第一导接件及壳体的连接结构示意图；Figure 4 is a schematic diagram showing the connection structure of the first conductor and the housing according to an embodiment of the present invention;
图5为本发明一实施例的示出第一导接件及壳体的连接结构示意图；Figure 5 is a schematic diagram showing the connection structure of the first conductor and the housing according to an embodiment of the present invention;
图6为本发明一实施例的示出第一导接件及壳体的连接结构的部分区域放大图。FIG. 6 is an enlarged view of a partial area showing the connection structure between the first conductive member and the housing according to an embodiment of the present invention.
附图标记说明：
1：壳体；11：第一侧板；12：第二侧板；13：第三侧板；14：第四侧板；
15：第五侧板；16：第六侧板；17：圆弧过渡部；131：减薄部；100：注液孔；2：电芯；23：延伸部；21：第一极耳；211：第一连接部；212：第二连接部；22第二极耳；221：第三连接部；222：第四连接部；3’：第二导接件；31：第一连接片；32：第二连接片；31’：第三连接片；32’：第四连接片；41：第一外接片；41’：第二外接片；42：第一极柱；43：第一外延部；5：第一绝缘片；5’：第三外绝缘片；6：第二绝缘片；6’：第四绝缘片；61：第一绝缘部；62：第二绝缘部；61’：第三绝缘部；62’：第四绝缘部；30：第一通孔；60：第二通孔；110：第三通孔；50：第四通孔；30’：第五通孔；60’：第六通孔；120：第七通孔；50’：第八通孔；71：第一保护胶层；72：第二保护胶层；8：第一绝缘层；9：缓冲片；91：第一缓冲部；92：第二缓冲部；93：第三缓冲部。Explanation of reference symbols:
1: Shell; 11: First side plate; 12: Second side plate; 13: Third side plate; 14: Fourth side plate;
15: Fifth side plate; 16: Sixth side plate; 17: Arc transition part; 131: Thinned part; 100: Liquid injection hole; 2: Battery core; 23: Extension part; 21: First tab; 211: first connection part; 212: second connection part; 22 second tab; 221: third connection part; 222: fourth connection part; 3': second conductor; 31: first connection piece; 32: The second connecting piece; 31': The third connecting piece; 32': The fourth connecting piece; 41: The first external connecting piece; 41': The second external connecting piece; 42: The first pole; 43: The first extension part; 5: first insulating piece; 5': third outer insulating piece; 6: second insulating piece; 6': fourth insulating piece; 61: first insulating part; 62: second insulating part; 61': Third insulating part; 62': fourth insulating part; 30: first through hole; 60: second through hole; 110: third through hole; 50: fourth through hole; 30': fifth through hole; 60 ': The sixth through hole; 120: The seventh through hole; 50': The eighth through hole; 71: The first protective adhesive layer; 72: The second protective adhesive layer; 8: The first insulating layer; 9: Buffer sheet; 91: first buffer part; 92: second buffer part; 93: third buffer part.
具体实施方式Detailed ways
为使本领域技术人员更好地理解本发明的方案，下面对本发明作进一步地详细说明。以下所列举具体实施方式只是对本发明的原理和特征进行描述，所举实例仅用于解释本发明，并非限定本发明的范围。基于本发明实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施方式，都属于本发明保护的范围。 In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be described in further detail below. The specific embodiments listed below only describe the principles and features of the present invention, and the examples are only used to explain the present invention and do not limit the scope of the present invention. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.
在本发明的描述中，除非另有明确的规定和限定，术语“设置”、“安装”、“连接”、“相连”、“相接”等应做广义理解，例如，可以是固定连接、也可以是可拆卸连接，也可以是一体连接；可以是机械连接，也可以是电连接等；可以是直接连接，也可以是通过中间媒介间接连接，也可以是两个元件内部连通。对于本领域的普通技术人员而言，可以具体情况理解上述属于在本发明中的具体含义。此外，“第一”、“第二”、“第三”、“第四”等术语仅用于描述目的，例如区分各部件，以更清楚说明/解释技术方案，而不能理解为指示或暗示所指示的技术特征的数量或具有实质性意义的顺序等含义。In the description of the present invention, unless otherwise expressly specified and limited, the terms "set", "installation", "connection", "connected", "connected", etc. should be understood in a broad sense. For example, they can be fixed connections, It can be a detachable connection or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, or it can be an internal connection between two components. For those of ordinary skill in the art, the above-mentioned specific meanings in the present invention can be understood in specific situations. In addition, terms such as "first", "second", "third", and "fourth" are only used for descriptive purposes, such as to distinguish between components, to more clearly illustrate/explain the technical solution, and cannot be understood as indicating or implying Meanings such as the number of technical features indicated or the order of substantial significance.
电池是常用的电化学储能装置，其一般包括壳体、封装在由壳体围设而成的腔体内的电芯等，电芯设有极耳(如下述的第一极耳)，在壳体与电芯之间通常需要留存较大的空间，以用于设置极耳，导致腔体空间浪费较多，影响电池的能量密度等性能。A battery is a commonly used electrochemical energy storage device. It generally includes a casing, a battery core packaged in a cavity surrounded by the casing, etc. The battery core is provided with tabs (such as the first tab below). A large space usually needs to be reserved between the casing and the battery core for the placement of the tabs, resulting in a large waste of cavity space and affecting the energy density and other performance of the battery.
如图1至图6所示，本发明实施例提供一种电池，包括：壳体1，围设成腔体；壳体1包括第一侧板11；电芯2，位于腔体内，电芯2面向第一侧板11的一侧设有第一极耳21、以及向第一侧板11延伸的延伸部23，第一极耳21与电芯2相接的一侧至第一侧板11的距离大于延伸部23至第一侧板11的距离。由此，利用第一侧板11与电芯2设有第一极耳21的端面之间的空间，使电芯2未设置极耳的部分延伸形成延伸部23，可以提高电池的能量密度等性能。As shown in Figures 1 to 6, an embodiment of the present invention provides a battery, which includes: a housing 1, which is surrounded by a cavity; the housing 1 includes a first side plate 11; and a battery core 2, which is located in the cavity. 2. The side facing the first side plate 11 is provided with a first tab 21 and an extension 23 extending toward the first side plate 11. The side of the first tab 21 in contact with the battery core 2 reaches the first side plate. The distance 11 is greater than the distance from the extending portion 23 to the first side plate 11 . Therefore, the space between the first side plate 11 and the end surface of the battery core 2 with the first tabs 21 is used to extend the portion of the battery core 2 without the tabs 21 to form the extension portion 23 , thereby improving the energy density of the battery. performance.
此外，电芯2面向第一侧板11的一侧还设有第二极耳22，第二极耳22与第一极耳21极性相反，将第一极耳21和第二极耳22设置在电芯2的同一侧，利于进一步节约腔体空间，提高电池的能量密度等性能。具体地，第一极耳21可以为正极耳或负极耳，相应地，第二极耳22可以为负极耳或正极耳。In addition, the side of the battery core 2 facing the first side plate 11 is also provided with a second tab 22. The second tab 22 has an opposite polarity to the first tab 21. The first tab 21 and the second tab 22 are Being arranged on the same side of the battery cell 2 will help further save the cavity space and improve the energy density and other performance of the battery. Specifically, the first tab 21 may be a positive tab or a negative tab, and accordingly, the second tab 22 may be a negative tab or a positive tab.
其中，第二极耳22与电芯2相接的一侧至第一侧板11的距离大于延伸部23至第一侧板11的距离，第二极耳22与电芯2相接的一侧至第一侧板11的距离和第一极耳21与电芯2相接的一侧至第一侧板11的距离可以相等或不等，优选基本相等，更利于节约腔体空间，提高电池的能量密度等性能。The distance between the side of the second tab 22 that is connected to the battery core 2 and the first side plate 11 is greater than the distance from the extension 23 to the first side plate 11 . The distance from the first side plate 11 to the first side plate 11 and the distance from the side where the first tab 21 is connected to the battery core 2 to the first side plate 11 may be equal or different, preferably substantially equal, which is more conducive to saving cavity space and improving the efficiency of the cavity. Battery energy density and other properties.
具体来说，电芯2面向第一侧板11的一侧存在第一区域、第二区域和第 三区域，第三区域向第一侧板11延伸形成延伸部23，第一区域的端面至第一侧板11的距离、第二区域的端面至第一侧板11的距离均分别小于第三区域的端面至第一侧板11的距离，第一极耳21设置在第一区域的端面上，第二极耳22设置在第二区域的端面上。Specifically, the side of the battery core 2 facing the first side plate 11 has a first area, a second area and a third area. Three regions, the third region extends toward the first side plate 11 to form an extension 23. The distance from the end face of the first region to the first side plate 11 and the distance from the end face of the second region to the first side plate 11 are respectively smaller than the third region. The distance from the end surface of the region to the first side plate 11 is: the first tab 21 is disposed on the end surface of the first region, and the second tab 22 is disposed on the end surface of the second region.
一般情况下，第一极耳21在第一侧板11上的投影与延伸部23在第一侧板11上的投影可以不重叠(即第一极耳21平行于第一侧板11的延伸方向的投影与延伸部23平行于第一侧板11的延伸方向的投影不重叠)，第二极耳22在第一侧板11上的投影与延伸部23在第一侧板11上的投影可以不重叠，第二极耳22在第一侧板11上的投影与第一极耳21在第一侧板11上的投影可以不重叠。Generally, the projection of the first tab 21 on the first side plate 11 and the projection of the extension 23 on the first side panel 11 may not overlap (that is, the first tab 21 is parallel to the extension of the first side plate 11 direction does not overlap with the projection of the extending portion 23 parallel to the extending direction of the first side plate 11 ), the projection of the second tab 22 on the first side plate 11 does not overlap with the projection of the extending portion 23 on the first side plate 11 The projection of the second pole tab 22 on the first side plate 11 and the projection of the first pole tab 21 on the first side plate 11 may not overlap.
具体地，第一侧板11的延伸方向与第一侧板11的表面平行，示例性地，第一侧板11至电芯2的方向平行于壳体1的长度方向，第一侧板11的延伸方向可以是壳体1的宽度方向或壳体1的厚度方向。Specifically, the extension direction of the first side plate 11 is parallel to the surface of the first side plate 11 . For example, the direction from the first side plate 11 to the battery core 2 is parallel to the length direction of the housing 1 . The first side plate 11 The extension direction of may be the width direction of the housing 1 or the thickness direction of the housing 1 .
一般情况下，壳体1的长度方向亦为电芯2的长度方向，壳体1的宽度方向亦为电芯2的宽度方向，壳体1的厚度方向亦为电芯2的厚度方向。此外，电芯2可以包括多个层叠设置的极片(或称电极片)，极片沿电芯2的厚度方向层叠设置，即电芯2的厚度方向亦为电极片的厚度方向。Generally, 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, and the thickness direction of the housing 1 is also the thickness direction of the battery core 2. In addition, the battery core 2 may include a plurality of stacked pole pieces (or electrode sheets). The pole pieces 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.
此外，电池还包括与第一侧板11相连的第六侧板16，第一极耳21在第六侧板16上的投影与延伸部23在第六侧板16上的投影至少部分重叠，第二极耳22在第六侧板16上的投影与延伸部23在第六侧板16上的投影可以至少部分重叠，第二极耳22在第六侧板16上的投影与第一极耳21在第六侧板16上的投影可以至少部分重叠，一般延伸部23在第六侧板16上的投影可以覆盖第一极耳21在第六侧板16上的投影和第二极耳22在第六侧板16上的投影。示例性地，延伸部23、第一极耳21、第二极耳22可以沿第一方向分布，该第一方向垂直于从电芯2至第一侧板11的方向，例如为电芯2的宽度方向(即延伸部23垂直于电芯2的宽度方向的投影与第一极耳21垂直于电芯2的宽度方向的投影至少部分重叠)。In addition, the battery further includes a sixth side plate 16 connected to the first side plate 11 , and the projection of the first tab 21 on the sixth side plate 16 at least partially overlaps with the projection of the extension 23 on the sixth side plate 16 , The projection of the second pole lug 22 on the sixth side plate 16 and the projection of the extension part 23 on the sixth side plate 16 may at least partially overlap. The projection of the second pole lug 22 on the sixth side plate 16 is consistent with the projection of the first pole The projection of the ear 21 on the sixth side plate 16 can at least partially overlap. Generally, the projection of the extension portion 23 on the sixth side plate 16 can cover the projection of the first pole 21 on the sixth side plate 16 and the second pole. The projection of 22 on the sixth side panel 16. For example, the extension portion 23 , the first tab 21 , and the second tab 22 may be distributed along a first direction that is perpendicular to the direction from the battery core 2 to the first side plate 11 , for example, the battery core 2 in the width direction (that is, the projection of the extension portion 23 perpendicular to the width direction of the battery core 2 at least partially overlaps with the projection of the first tab 21 perpendicular to the width direction of the battery core 2 ).
具体地，第六侧板16的表面可以与第一侧板11的表面垂直，第六侧板16的表面与电极片的表面垂直(与电极片的厚度方向平行)，第一侧板11的表面与电极片的表面垂直。 Specifically, the surface of the sixth side plate 16 may be perpendicular to the surface of the first side plate 11 , the surface of the sixth side plate 16 may be perpendicular to the surface of the electrode sheet (parallel to the thickness direction of the electrode sheet), and the surface of the first side plate 11 may be perpendicular to the surface of the electrode sheet. The surface is perpendicular to the surface of the electrode sheet.
一般情况下，延伸部23在电芯2厚度方向上的长度等于电芯2的厚度。具体来说，延伸部23和电芯2分别具有相对的第一面和第二面，第一面和第二面分别位于电芯2面向第一侧板11的端面(即设有第一极耳21和延伸部23的端面)的相对两侧，延伸部23的第一面与电芯2的第一面持平，延伸部23的第二面与电芯2的第二面持平。Generally, the length of the extension portion 23 in the thickness direction of the battery core 2 is equal to the thickness of the battery core 2 . Specifically, the extension part 23 and the battery core 2 respectively have opposite first and second surfaces. The first surface and the second surface are respectively located at the end surface of the battery core 2 facing the first side plate 11 (that is, the first pole is provided with the end surface of the battery core 2 facing the first side plate 11. The first surface of the extension part 23 is flush with the first surface of the battery core 2 , and the second surface of the extension part 23 is flush with the second surface of the battery core 2 .
此外，延伸部23的数量可以为至少两个，第一极耳21可以位于两个相邻的延伸部23之间，第二极耳22亦可以位于两个相邻的延伸部23之间，第二极耳22与第一极耳21之间存在延伸部23(即第一极耳21和第二极耳22被延伸部23隔开)。第一极耳21的数量为n1，第二极耳22的数量为n2，延伸部23的数量为n3，n1与n2可以相等或不等，n3＝n1+n2+1，示例性地，n1＝1，n2＝1，n3＝3。In addition, the number of extension parts 23 may be at least two, the first pole 21 may be located between two adjacent extension parts 23, and the second pole 22 may also be located between two adjacent extension parts 23, There is an extension portion 23 between the second pole tab 22 and the first pole tab 21 (that is, the first pole tab 21 and the second pole tab 22 are separated by the extension portion 23). The number of first pole tabs 21 is n1, the number of second pole tabs 22 is n2, and the number of extension parts 23 is n3. n1 and n2 may be equal or different, n3=n1+n2+1, for example, n1 =1, n2=1, n3=3.
此外，电池还包括与第一极耳21电连接的第一导接件，第一导接件位于腔体内；第一导接件包括第二连接片32，第一极耳21包括与第二连接片32相接的第二连接部212。其中，第二连接部212与第二连接片32相接的一面和极片的表面基本平行，具体地，第二连接部212与第二连接片32层叠设置，第二连接部212的表面、第二连接片32的表面与极片的表面基本平行。In addition, the battery also includes a first conductor electrically connected to the first tab 21, and the first conductor is located in the cavity; the first conductor includes a second connecting piece 32, and the first tab 21 includes a second connecting piece 32. The second connecting portion 212 is in contact with the connecting pieces 32 . The surface of the second connecting part 212 that is in contact with the second connecting piece 32 is substantially parallel to the surface of the pole piece. Specifically, the second connecting part 212 and the second connecting piece 32 are stacked, and the surface of the second connecting part 212, The surface of the second connecting piece 32 is substantially parallel to the surface of the pole piece.
一般情况下，第一极耳21的第二连接部212在第一侧板11上的投影与第一导接件的第二连接片32在第一侧板11上的投影的边界接触，但除接触的边界外的其余部分不互相重叠。Generally, the projection of the second connecting portion 212 of the first tab 21 on the first side panel 11 is in contact with the boundary of the projection of the second connecting piece 32 of the first conductor on the first side panel 11 . However, Except for the touching boundaries, the remaining parts do not overlap each other.
在一些实施例中，壳体1包括与第一侧板11相连的第二侧板12，第一极耳21还包括与第二连接部212相连的第一连接部211，第一连接部211与电芯2连接，其中，第二连接部212背离第二侧板12的一侧与第一导接件连接，具体可以与第一导接件的第二连接片32连接，即第二侧板12、第二连接部212、第二连接片32依次层叠设置，第二连接部212位于第二侧板12与第二连接片32之间；或者，第二连接部212面向第二侧板12的一侧与第一导接件连接，具体可以与第一导接件的第二连接片32连接，即第二侧板12、第二连接片32、第二连接部212依次层叠设置，第二连接片32位于第二侧板12与第二连接部212之间。由此，可以提高第一极耳21与第一导接件之间的连接稳定性，同时节约腔体空间，提高电池的能量密度等性能。In some embodiments, the housing 1 includes a second side plate 12 connected to the first side plate 11 , and the first tab 21 further includes a first connecting part 211 connected to the second connecting part 212 . The first connecting part 211 Connected to the battery core 2 , the side of the second connecting portion 212 away from the second side plate 12 is connected to the first conductive member, specifically, it can be connected to the second connecting piece 32 of the first conductive member, that is, the second side The board 12, the second connecting part 212, and the second connecting piece 32 are stacked in sequence, and the second connecting part 212 is located between the second side plate 12 and the second connecting piece 32; or, the second connecting part 212 faces the second side plate. One side of 12 is connected to the first conductive member, specifically, it can be connected to the second connecting piece 32 of the first conductive member, that is, the second side plate 12, the second connecting piece 32, and the second connecting portion 212 are stacked in sequence. The second connecting piece 32 is located between the second side plate 12 and the second connecting portion 212 . Thus, the connection stability between the first tab 21 and the first conductive member can be improved, while the cavity space can be saved, and the energy density and other performance of the battery can be improved.
在一些实施例中，第一连接部211与电芯2相接的一面和第二连接部212 与第二连接片32相接的一面之间形成有第一夹角，第一夹角的范围为80-120°，例如80°、90°、100°、120°等。In some embodiments, the side of the first connecting part 211 that is connected to the battery core 2 and the second connecting part 212 A first included angle is formed between the surfaces that are in contact with the second connecting piece 32 . The first included angle ranges from 80° to 120°, such as 80°, 90°, 100°, 120°, etc.
具体地，第二侧板12的表面与极片的表面平行，第二侧板12的表面与第一侧板11的表面垂直，第二侧板12的表面与第六侧板16的表面垂直。第一极耳21的第一连接部211的表面可以与第二连接部212的表面垂直，其中，第一连接部211的表面可以与极片表面垂直，第二连接部212的表面可以与极片表面平行。Specifically, the surface of the second side plate 12 is parallel to the surface of the pole piece, the surface of the second side plate 12 is perpendicular to the surface of the first side plate 11 , and the surface of the second side plate 12 is perpendicular to the surface of the sixth side plate 16 . The surface of the first connecting portion 211 of the first tab 21 can be perpendicular to the surface of the second connecting portion 212 , wherein the surface of the first connecting portion 211 can be perpendicular to the surface of the pole piece, and the surface of the second connecting portion 212 can be perpendicular to the surface of the pole piece. The sheet surfaces are parallel.
此外，第一导接件还包括与第二连接片32相连的第一连接片31；第一连接片31位于第一侧板11与第一极耳21之间，具体可以位于第一侧板11与第一极耳21的第一连接部211之间，第一连接片31与第一连接部211之间的距离可以等于或大于第二连接部212(或第二连接片32)在沿第一连接部211至第一连接片31的方向上的长度。In addition, the first conductive member also includes a first connecting piece 31 connected to the second connecting piece 32; the first connecting piece 31 is located between the first side plate 11 and the first tab 21, specifically, it can be located on the first side plate. 11 and the first connecting portion 211 of the first tab 21, the distance between the first connecting piece 31 and the first connecting portion 211 may be equal to or greater than the distance along the edge of the second connecting portion 212 (or the second connecting piece 32). The length in the direction from the first connecting portion 211 to the first connecting piece 31 .
在一些实施例中，第一连接片31所在平面和第二连接片32所在平面之间形成有第二夹角，第二夹角的范围为80-120°，例如80°、90°、100°、120°等。In some embodiments, a second included angle is formed between the plane where the first connecting piece 31 is located and the plane where the second connecting piece 32 is located. The second included angle ranges from 80° to 120°, such as 80°, 90°, 100°. °, 120°, etc.
具体地，电芯2包括依次层叠设置的极片，该极片包括第一极片、第二极片，第一极片与第二极片之间设有隔膜，即电芯包括依次层叠设置的第一极片、第二极片、以及位于第一极片和第二极片之间的隔膜，第一极片与第二极片的极性相反，例如，第一极片为正极片，第二极片为负极片，或者第一极片为负极片，第二极片为正极片，第一极耳21设置在第一极片上，第二极耳22设置在第二极片上。其中，第一极片和第二极片的数量分别为多个，每个第一极片上至少设有一个第一极耳21(即第一极耳21的数量为多个)，该多个第一极耳21的第二连接部212依次贴合组成第一极耳板，第一极耳板与第一导接件连接，以实现第一极耳21与第一导接件连接，具体可以与第一导接件的第二连接片32连接。Specifically, the battery core 2 includes pole pieces that are stacked in sequence. The pole pieces include first pole pieces and second pole pieces. A separator is provided between the first pole piece and the second pole piece. That is, the battery core includes pole pieces that are stacked in sequence. The first pole piece, the second pole piece, and the separator located between the first pole piece and the second pole piece, the polarity of the first pole piece and the second pole piece are opposite, for example, the first pole piece is the positive pole piece , the second pole piece is a negative pole piece, or the first pole piece is a negative pole piece, and the second pole piece is a positive pole piece, the first pole tab 21 is arranged on the first pole piece, and the second pole tab 22 is arranged on the second pole piece. Wherein, the number of the first pole piece and the second pole piece is multiple respectively, and each first pole piece is provided with at least one first pole tab 21 (that is, the number of the first pole tab 21 is multiple), and the plurality of first pole tabs 21 are provided. The second connecting portions 212 of the first tab 21 are sequentially attached to form a first tab plate, and the first tab plate is connected to the first conductive member to realize the connection between the first tab 21 and the first conductive member. Specifically, It can be connected with the second connecting piece 32 of the first guide member.
具体地，至少部分层叠设置的第一极片、隔膜和第二极片为如下设置：第一极片、隔膜、第二极片的一端均设有第一凹口(或称第一缺口)，其第一凹口位置对应，第一极耳位于第一极片的第一凹口内，第一极片、隔膜、第二极片层叠设置后，第一极片的第一凹口的侧壁、隔膜的第一凹口的侧壁、第二极片的第一凹口的侧壁依次贴合形成延伸部23，第一极片的第一凹口内 的第一极耳依次贴合形成第一极耳板；第一极片、隔膜、第二极片的一端均设有第二凹口(或称第二缺口)，其第二凹口位置对应，第二极耳位于第二极片的第二凹口内，第一极片、隔膜、第二极片层叠设置后，第一极片的第一凹口的侧壁、隔膜的第一凹口的侧壁、第二极片的第一凹口的侧壁依次贴合形成延伸部23，第二极片的第二凹口内的第二极耳依次贴合形成第二极耳板。Specifically, the first pole piece, the separator, and the second pole piece that are at least partially stacked are arranged as follows: one end of the first pole piece, the separator, and the second pole piece is provided with a first notch (or first notch). , the position of the first notch corresponds to the first pole tab located in the first notch of the first pole piece. After the first pole piece, the diaphragm, and the second pole piece are stacked, the side of the first notch of the first pole piece The wall, the side wall of the first recess of the diaphragm, and the side wall of the first recess of the second pole piece are sequentially joined to form the extension 23. In the first recess of the first pole piece, The first tabs of the electrodes are sequentially joined to form the first tab plate; one end of the first pole piece, the diaphragm, and the second pole piece are each provided with a second notch (or second notch), and the position of the second notch corresponds to , the second pole tab is located in the second notch of the second pole piece. After the first pole piece, the diaphragm, and the second pole piece are stacked, the side walls of the first notch of the first pole piece and the first notch of the diaphragm The side walls of the second pole piece and the side walls of the first recess of the second pole piece are laminated in sequence to form the extension part 23, and the second tabs in the second recess of the second pole piece are laminated in sequence to form a second tab plate.
此外，壳体1还包括与第一侧板11相连的第三侧板13，第二侧板12与第三侧板13相对设置，第二侧板12的表面可以与第三侧板13的表面平行。In addition, the housing 1 also includes a third side plate 13 connected to the first side plate 11 . The second side plate 12 is opposite to the third side plate 13 . The surface of the second side plate 12 can be aligned with the surface of the third side plate 13 . The surfaces are parallel.
在一些实施例中，如图1所示，第一极耳21的第二连接部212朝向靠近第二侧板12的方向贴合，形成第一极耳板，即第一极耳板至第二侧板12的距离小于第一极耳板至第三侧板13的距离。In some embodiments, as shown in FIG. 1 , the second connecting portion 212 of the first tab 21 is attached in a direction close to the second side plate 12 to form a first tab plate, that is, the first tab plate to the second tab plate. The distance between the two side plates 12 is smaller than the distance from the first tab plate to the third side plate 13 .
在另一些实施例中，第一极耳21的第二连接部212朝向靠近第三侧板13的方向贴合，形成第一极耳板，即第一极耳板至第三侧板13的距离小于第一极耳板至第二侧板12的距离。In other embodiments, the second connecting portion 212 of the first tab 21 is attached in a direction close to the third side plate 13 to form a first tab plate, that is, from the first tab plate to the third side plate 13 . The distance is smaller than the distance from the first tab plate to the second side plate 12 .
在另一些实施例中，第一极耳21的第二连接部212朝向电芯2的厚度方向上的中心线贴合，形成第一极耳板，即第一极耳板至第二侧板12的距离与第一极耳板至第三侧板13的距离可以基本相等。In other embodiments, the second connecting portion 212 of the first tab 21 is aligned toward the centerline in the thickness direction of the battery core 2 to form a first tab plate, that is, the first tab plate to the second side plate. The distance 12 may be substantially equal to the distance from the first tab plate to the third side plate 13 .
一般情况下，在沿电芯2的厚度方向上，第一极耳21、以及由多个第一极耳21的第二连接部212贴合形成的第一极耳板不伸出电芯2的外缘，具体地，第一极耳21的第二连接部212/第一极耳板至第二侧板12的距离可以大于或等于电芯2至第二侧板12的距离，第一极耳21的第二连接部212/第一极耳板至第三侧板13的距离可以大于或等于电芯2至第三侧板13的距离。这样，与第二连接部212/第一极耳板相连的第二连接片32在第一侧板11上的投影至少部分位于电芯2在第一侧板11上的投影内，可以减小腔体在沿第二侧板12至第三侧板13的方向上的空间浪费，提高电池的能量密度等性能。Generally, in the thickness direction of the battery core 2 , the first tab 21 and the first tab plate formed by the second connecting portions 212 of the plurality of first tabs 21 do not protrude from the battery core 2 The outer edge of the first tab 21, specifically, the distance from the second connecting portion 212/first tab plate of the first tab 21 to the second side plate 12 can be greater than or equal to the distance from the battery core 2 to the second side plate 12. The first The distance from the second connecting portion 212/first tab plate of the tab 21 to the third side plate 13 may be greater than or equal to the distance from the battery core 2 to the third side plate 13 . In this way, the projection of the second connecting piece 32 connected to the second connecting part 212/the first lug plate on the first side plate 11 is at least partially located within the projection of the battery core 2 on the first side plate 11, which can reduce the The space of the cavity in the direction from the second side plate 12 to the third side plate 13 is wasted, thereby improving the energy density and other performance of the battery.
具体地，以第二连接片32设置在第二连接部212/第一极耳板面向第二侧板12的一侧为例，在沿第二连接部212/第一极耳板至第二侧板12的方向上，第二连接片32至少部分延伸至第二连接部212/第一极耳板与电芯2面向第二侧板12的一侧之间(即第二连接片32延伸至第二连接部212/第一极耳板与电芯2面向第二侧板12的一侧之间的部分在第一侧板11上的投影位于电芯 2在第一侧板11上的投影内)，以与第二连接部212/第二极耳板连接(但不与延伸部23接触)。Specifically, taking the second connecting piece 32 being disposed on the side of the second connecting part 212/first lug plate facing the second side plate 12 as an example, along the second connecting part 212/first lug plate to the second In the direction of the side plate 12, the second connecting piece 32 at least partially extends between the second connecting portion 212/the first tab plate and the side of the battery core 2 facing the second side plate 12 (that is, the second connecting piece 32 extends The projection of the portion between the second connecting portion 212/the first tab plate and the side of the battery core 2 facing the second side plate 12 on the first side plate 11 is located on the battery core. 2 within the projection on the first side plate 11) to be connected with the second connection part 212/second lug plate (but not in contact with the extension part 23).
此外，在一些实施例中，沿电芯2至第一侧板11的方向，延伸部23可以与第一极耳板/第一极耳21持平，或者延伸部23比第一极耳板/第一极耳21更靠近第一侧板11，即第一极耳板/第一极耳21至第一侧板11的距离等于或大于延伸部23至第一侧板11的距离，这样有利于进一步提高电池的能量密度。但不局限于此，在另一些实施例中，第一极耳板/第一极耳21可以比延伸部23更靠近第一侧板11，即第一极耳板/第一极耳21至所述第一侧板11的距离小于延伸部23至第一侧板11的距离，亦即，在电芯2至第一侧板11的方向上，第一极耳板/第一极耳21远离电芯2的一端位于延伸部23与第一侧板11之间，相对更利于第一极耳21/第一极耳板与第二连接片32连接，增大二者接触面积，提高稳定性。In addition, in some embodiments, along the direction from the battery core 2 to the first side plate 11 , the extension portion 23 may be level with the first tab plate/first tab 21 , or the extension portion 23 may be larger than the first tab plate/ The first tab 21 is closer to the first side plate 11 , that is, the distance from the first tab plate/first tab 21 to the first side plate 11 is equal to or greater than the distance from the extension 23 to the first side plate 11 , so that It is beneficial to further improve the energy density of the battery. But it is not limited thereto. In other embodiments, the first tab plate/first tab 21 may be closer to the first side plate 11 than the extension 23 , that is, the first tab plate/first tab 21 to The distance between the first side plate 11 is less than the distance from the extension 23 to the first side plate 11 , that is, in the direction from the battery core 2 to the first side plate 11 , the first tab plate/first tab 21 The end far away from the battery core 2 is located between the extension 23 and the first side plate 11, which is relatively more conducive to the connection between the first tab 21/the first tab plate and the second connecting piece 32, increasing the contact area between the two and improving stability. sex.
此外，第一导接件在第二侧板12上的投影与延伸部23在第二侧板12上的投影不重叠，即第一连接片31在第二侧板12上的投影、第二连接片32在第二侧板12上的投影均分别与延伸部23在第二侧板12上的投影不重叠。In addition, the projection of the first guide member on the second side panel 12 does not overlap with the projection of the extension portion 23 on the second side panel 12 , that is, the projection of the first connecting piece 31 on the second side panel 12 and the projection of the second connecting piece 31 on the second side panel 12 do not overlap. The projection of the connecting piece 32 on the second side panel 12 does not overlap with the projection of the extension portion 23 on the second side panel 12 respectively.
此外，电池还包括设置在第一侧板11背离腔体的一侧的第一外接片41，第一外接片41包括向外凸起形成的第一极柱42，第一侧板11设有与第一极柱42对应设置的第三通孔110，第一极柱42通过第三通孔110与第一连接片31连接。In addition, the battery also includes a first external connection piece 41 disposed on the side of the first side plate 11 away from the cavity. The first external connection piece 41 includes a first pole 42 formed by protruding outward. The first side plate 11 is provided with The third through hole 110 is provided corresponding to the first pole 42 , and the first pole 42 is connected to the first connecting piece 31 through the third through hole 110 .
此外，第一连接片31包括与第一极柱42对应设置的第一通孔30，第一极柱42穿透第一侧板11(即穿过第三通孔110)、并通过第一通孔30与第一连接片31相接。其中，第一极柱42穿过第三通孔110，以实现穿透第一侧板11，第三通孔110与第一通孔30可以同轴设置。In addition, the first connecting piece 31 includes a first through hole 30 corresponding to the first pole 42. The first pole 42 penetrates the first side plate 11 (ie, passes through the third through hole 110) and passes through the first through hole 110. The through hole 30 is connected to the first connecting piece 31 . The first pole 42 passes through the third through hole 110 to penetrate the first side plate 11 . The third through hole 110 and the first through hole 30 may be coaxially arranged.
一般情况下，第一极柱42垂直于第一极柱42的轴向的横截面为圆形，示例性地，第一极柱42可以是圆柱形，或者，第一极柱42为锥形结构，即沿从第一侧板11至第一连接片31的方向，第一极柱42的直径呈增大或减小趋势，第一极柱42直径即为第一极柱42垂直于第一极柱42的轴向的横截面的直径。Generally, the cross section of the first pole 42 perpendicular to the axial direction of the first pole 42 is circular. For example, the first pole 42 may be cylindrical, or the first pole 42 may be tapered. structure, that is, along the direction from the first side plate 11 to the first connecting piece 31, the diameter of the first pole 42 shows an increasing or decreasing trend, and the diameter of the first pole 42 is the diameter of the first pole 42 perpendicular to the first pole 42. The diameter of the axial cross-section of a pole 42.
具体地，当第一极柱42为锥形结构时，沿从第一侧板11至第一连接片31的方向，第一极柱42的直径呈变化趋势(即增大或减小趋势)，该变化 可以是逐渐变化，即以基本相同的幅度均匀增大或减小。第三通孔110、第一通孔30的孔径(直径)随第一极柱42的直径相应变化，例如，沿从第一侧板11至第一连接片31的方向，第一极柱42的直径逐渐增大，此时第三通孔110、第一通孔30的孔径也逐渐增大；沿从第一侧板11至第一连接片31的方向，第一极柱42的直径逐渐减小，此时第三通孔110、第一通孔30的孔径也逐渐减小。Specifically, when the first pole 42 has a tapered structure, the diameter of the first pole 42 shows a changing trend (ie, an increasing or decreasing trend) along the direction from the first side plate 11 to the first connecting piece 31 . , the change It can be a gradual change, that is, a uniform increase or decrease with essentially the same amplitude. The aperture (diameter) of the third through hole 110 and the first through hole 30 changes correspondingly with the diameter of the first pole 42 , for example, along the direction from the first side plate 11 to the first connecting piece 31 , the first pole 42 The diameter gradually increases. At this time, the diameters of the third through hole 110 and the first through hole 30 also gradually increase; along the direction from the first side plate 11 to the first connecting piece 31, the diameter of the first pole 42 gradually increases. decreases, at this time, the diameters of the third through hole 110 and the first through hole 30 also gradually decrease.
在一些实施例中，第一连接片31的第一通孔30包括相互连接的第一孔段和第二孔段，第二孔段位于第一孔段靠近电芯2的一侧；第一极柱42靠近电芯2的一端向外延伸形成有与第二孔段对应设置的第一外延部43。In some embodiments, the first through hole 30 of the first connecting piece 31 includes a first hole segment and a second hole segment connected to each other, and the second hole segment is located on the side of the first hole segment close to the battery core 2; One end of the pole 42 close to the battery core 2 extends outward to form a first extension 43 corresponding to the second hole section.
具体地，第一孔段与第二孔段可以同轴设置，第一孔段、第二孔段均为圆形通孔，第二孔段的直径大于第一孔段与第二孔段相接的一端的直径，优选地，第二孔段的直径大于第一孔段的直径，第二孔段垂直于第一通孔30的轴向的投影可以覆盖第一孔段垂直于第一通孔30的轴向的投影。Specifically, the 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 first through hole 30 can cover the first hole segment perpendicular to the first through hole 30. Axial projection of hole 30.
此外，第一外接片41垂直于第一极柱42的轴向的横截面面积可以大于第一极柱42垂直于第一极柱42的轴向的横截面面积，第一外接片41垂直于第一极柱42的轴向的投影覆盖第一极柱42垂直于第一极柱42的轴向的投影，第一外延部43垂直于第一极柱42的横截面面积大于第一极柱42垂直于第一极柱42轴向的横截面面积，第一外延部43垂直于第一极柱42的轴向的投影覆盖第一极柱42垂直于第一极柱42的轴向的投影，第一外接片41垂直于第一极柱42的轴向的横截面面积大于第一外延部43垂直于第一极柱42的轴向的横截面面积，第一外接片41垂直于第一极柱42的轴向的投影覆盖第一外延部43垂直于第一极柱42的轴向的投影，第一外延部43垂直于第一极柱42的轴向的横截面面积基本等于第二孔段垂直于第一极柱42的轴向(亦为第一通孔30的轴向)的横截面面积，第一外延部43卡合在第二孔段，与第二孔段的侧壁相接。In addition, the cross-sectional area of the first external piece 41 perpendicular to the axial direction of the first pole 42 may be larger than the cross-sectional area of the first pole 42 perpendicular to the axial direction of the first pole 42 . The first external piece 41 is perpendicular to the axial direction of the first pole 42 . The axial projection of the first pole 42 covers the axial projection of the first pole 42 perpendicular to the first pole 42 , and the cross-sectional area of the first extension 43 perpendicular to the first pole 42 is larger than the first pole 42 42 is a cross-sectional area perpendicular to the axial direction of the first pole 42 , and the projection of the first extension 43 perpendicular to the axial direction of the first pole 42 covers the projection of the first pole 42 perpendicular to the axial direction of the first pole 42 , the cross-sectional area of the first external piece 41 perpendicular to the axial direction of the first pole 42 is greater than the cross-sectional area of the first extension 43 perpendicular to the axial direction of the first pole 42, and the first external piece 41 is perpendicular to the first pole. The axial projection of the pole 42 covers the axial projection of the first extension 43 perpendicular to the first pole 42 , and the cross-sectional area of the first extension 43 perpendicular to the axial direction of the first pole 42 is substantially equal to the second The cross-sectional area of the hole section is perpendicular to the axial direction of the first pole 42 (also the axial direction of the first through hole 30). The first extension 43 is engaged with the second hole section and is connected to the side wall of the second hole section. connected.
在一些实施例中，第一极柱42的靠近电芯2的一端面与第一连接片31的靠近电芯2的一侧表面齐平。具体地，第一外延部43沿第一通孔30的轴向的厚度基本等于第二孔段沿第一通孔30的轴向的深度，由此，第一外延部43卡扣在第二孔段中，第一外延部43靠近电芯2的一端面与第一连接片31面向电芯2的一侧表面齐平。 In some embodiments, an end surface of the first pole 42 close to the battery core 2 is flush with a side surface of the first connecting piece 31 close to the battery core 2 . Specifically, the thickness of the first extension portion 43 along the axial direction of the first through hole 30 is substantially equal to the depth of the second hole section along the axial direction of the first through hole 30 . Therefore, the first extension portion 43 snaps into place on the second through hole 30 . In the hole section, an end surface of the first extension portion 43 close to the battery core 2 is flush with a side surface of the first connecting piece 31 facing the battery core 2 .
在另一些实施例中，第一极柱42靠近电芯2的一端伸出第一通孔30、并沿第一通孔30的周向向外延伸形成有与第一连接片31靠近电芯2的一侧表面相接的第一外延部43，即第一极柱42靠近电芯2的一端面不与第一连接片31面向电芯2的一侧表面齐平，而是位于第一连接片31与电芯2之间。In other embodiments, one end of the first pole 42 close to the battery core 2 protrudes from the first through hole 30 and extends outward along the circumferential direction of the first through hole 30 to form a connecting piece 31 close to the battery core. The first extension 43 connected to one side surface of 2, that is, the end surface of the first pole 42 close to the battery core 2 is not flush with the side surface of the first connecting piece 31 facing the battery core 2, but is located on the first between connecting piece 31 and battery core 2.
其中，第一外接片41、第一极柱42、第一外延部43可以一体成型，其可以是金属材质，具体实施时，可以使第一连接片31与第一侧板11通过铆钉进行铆接，经铆接之后，铆钉位于第一侧板11背离腔体的一端形成第一外接片41，另一端形成第一外延部43，而其两端之间的部分形成第一极柱42，所形成的的第一极柱42例如是锥形结构。Among them, the first external connecting piece 41, the first pole 42, and the first extension part 43 can be integrally formed, and they can be made of metal. During specific implementation, the first connecting piece 31 and the first side plate 11 can be riveted through rivets. , after riveting, the rivet is located at one end of the first side plate 11 away from the cavity to form the first external piece 41, the other end forms the first extension 43, and the part between the two ends forms the first pole 42, forming The first pole 42 has a tapered structure, for example.
具体地，第一极耳21可以和壳体1电连接，此时第一外接片41、第一极柱42、第一导接件的第一连接片31可以和壳体1直接接触，或者第一转接的第二连接片32与壳体1的第二侧板12(或第三侧板13)焊接(可以不设置第一连接片31、以及第一外接片41等)。一般更优选第一极耳21与壳体1绝缘连接，具体可以通过设置绝缘片(绝缘层)进行绝缘。Specifically, the first tab 21 can be electrically connected to the housing 1. At this time, the first external piece 41, the first pole 42, and the first connecting piece 31 of the first conductive member can be in direct contact with the case 1, or The second connecting piece 32 of the first transition is welded to the second side plate 12 (or the third side plate 13) of the housing 1 (the first connecting piece 31, the first external connecting piece 41, etc. may not be provided). Generally, it is more preferred that the first tab 21 is insulatedly connected to the housing 1. Specifically, the insulation can be performed by providing an insulating sheet (insulating layer).
在一些实施例中，第一外接片41与第一侧板11之间还设有第一绝缘片5，第一导接件与第一侧板11之间还设有第二绝缘片6，第一极柱42穿透第一绝缘片5和第二绝缘片6，第一极柱42与第一侧板11之间设有第一绝缘层8，由此，第一外接片41、第一极柱42、第一导接件和第一极耳21电连接，而与第一侧板11(壳体1)绝缘。In some embodiments, a first insulating sheet 5 is disposed between the first external piece 41 and the first side plate 11, and a second insulating sheet 6 is disposed between the first conductor and the first side plate 11. The first pole 42 penetrates the first insulating sheet 5 and the second insulating sheet 6, and a first insulating layer 8 is provided between the first pole 42 and the first side plate 11. Therefore, the first external piece 41 and the second insulating sheet 6 are connected to each other. A pole 42, the first conductive member and the first tab 21 are electrically connected and insulated from the first side plate 11 (casing 1).
其中，第二绝缘片6具体可以位于第一连接片31与第一侧板11之间，即第一外接片41、第一绝缘片5、第一侧板11、第二绝缘片6、第一连接片31依次层叠设置。The second insulating sheet 6 can be specifically located between the first connecting sheet 31 and the first side plate 11 , that is, the first external connecting piece 41 , the first insulating sheet 5 , the first side plate 11 , the second insulating sheet 6 , and the first side plate 11 . A connecting piece 31 is stacked in sequence.
此外，沿第一通孔30的周向，第一通孔30的孔径与极柱的直径之差基本等于第一绝缘层8沿第一通孔30的周向的宽度，该第一通孔30的周向与第一通孔30的轴向垂直。具体地，第一绝缘层8可以与第一绝缘片5一体成型，第一绝缘层8由第一绝缘片5靠近第一侧板11的一侧向外凸起(向第三通孔110内凸起)形成；或者，第一绝缘层8可以与第二绝缘片6一体成型，第一绝缘层8由第二绝缘片6靠近第一侧板11的一侧向外凸起(向第三通孔110内凸起)形成。In addition, along the circumferential direction of the first through hole 30 , the difference between the diameter of the first through hole 30 and the diameter of the pole is substantially equal to the width of the first insulating layer 8 along the circumferential direction of the first through hole 30 . The circumferential direction of 30 is perpendicular to the axial direction of the first through hole 30 . Specifically, the first insulating layer 8 can be integrally formed with the first insulating sheet 5 , and the first insulating layer 8 protrudes outward from the side of the first insulating sheet 5 close to the first side plate 11 (into the third through hole 110 protrusions); alternatively, the first insulating layer 8 can be integrally formed with the second insulating sheet 6, and the first insulating layer 8 protrudes outward (toward the third side) from the side of the second insulating sheet 6 close to the first side plate 11. The through hole 110 is formed with an inner protrusion).
相应地，第一绝缘片5设有第四通孔50，第一极柱42穿过第四通孔50， 以实现穿透第一绝缘片5；第二绝缘片6设有第二通孔60，第一极柱42穿过第二通孔60，以实现穿透第二绝缘片6。具体地，第一极柱42依次穿过第四通孔50、第三通孔110、第二通孔60、第一通孔30，以实现与第一导接件连接。其中，第四通孔50、第三通孔110、第二通孔60、第一通孔30可以同轴设置。Correspondingly, the first insulating sheet 5 is provided with a fourth through hole 50, and the first pole 42 passes through the fourth through hole 50, To achieve penetration of the first insulating sheet 5; the second insulating sheet 6 is provided with a second through hole 60, and the first pole 42 passes through the second through hole 60 to achieve penetration of the second insulating sheet 6. Specifically, the first pole 42 passes through the fourth through hole 50 , the third through hole 110 , the second through hole 60 , and the first through hole 30 in order to achieve connection with the first conductive member. The fourth through hole 50 , the third through hole 110 , the second through hole 60 and the first through hole 30 may be coaxially arranged.
此外，第一绝缘片5在第一侧板11上的投影可以覆盖第一外接片41在第一侧板11上的投影(即第一外接片41在第一侧板11上的投影位于第一绝缘片5在第一侧板11上的投影内)。第二绝缘片6在第一侧板11上的投影可以覆盖第一连接片31在第一侧板11上的投影，由此，可以进一步提高电池安全性和稳定性等性能。In addition, the projection of the first insulating sheet 5 on the first side panel 11 can cover the projection of the first external sheet 41 on the first side panel 11 (that is, the projection of the first external sheet 41 on the first side panel 11 is located on the first side panel 11 ). An insulating sheet 5 is within the projection on the first side panel 11). The projection of the second insulating sheet 6 on the first side plate 11 can cover the projection of the first connecting piece 31 on the first side plate 11 , thereby further improving battery safety and stability.
具体地，第二绝缘片6可以是L型结构，其包括第一绝缘部61和第二绝缘部62；第一绝缘部61位于第一侧板11与第一导接件之间，第一极柱42穿透第一绝缘部61(即第二通孔60设置在第三绝缘部61’上)；第二绝缘部62位于第二侧板12与第一导接件之间，具体可以位于第二侧板12与第二连接片32之间，即第二侧板12、第二绝缘部62、第二连接片32依次层叠设置，由此，通过第二绝缘部62，可以为第一导接件提供支撑，并可以使第一导接件与壳体1的第二侧板12之间绝缘，提高电池的安全性和稳定性等性能。Specifically, the second insulating sheet 6 may have an L-shaped structure, which includes a first insulating part 61 and a second insulating part 62; the first insulating part 61 is located between the first side plate 11 and the first conductor, and the first insulating part 61 is located between the first side plate 11 and the first conductor. The pole 42 penetrates the first insulating part 61 (that is, the second through hole 60 is provided on the third insulating part 61'); the second insulating part 62 is located between the second side plate 12 and the first conductor. Specifically, is located between the second side plate 12 and the second connecting piece 32 , that is, the second side plate 12 , the second insulating part 62 , and the second connecting piece 32 are stacked in sequence. Therefore, through the second insulating part 62 , a third A conductive member provides support and can insulate the first conductive member from the second side plate 12 of the housing 1 to improve the safety and stability of the battery.
其中，第一绝缘部61在第一侧板11上的投影覆盖第一导接件在第一侧板11上的投影(覆盖第一连接片31在第一侧板11上的投影)，第二绝缘部62在第二侧板12上的投影覆盖第一导接件在第二侧板12上的投影(覆盖第二连接片32在第二侧板12上的投影)。Wherein, the projection of the first insulating part 61 on the first side plate 11 covers the projection of the first conductor on the first side plate 11 (covers the projection of the first connecting piece 31 on the first side plate 11), and the The projection of the two insulating parts 62 on the second side panel 12 covers the projection of the first conductive member on the second side panel 12 (covers the projection of the second connecting piece 32 on the second side panel 12 ).
其中，第二侧板12的表面与电极片的表面平行；第二侧板12与第一侧板11的表面不平行，例如垂直；第二侧板12例如可为底侧板(或称底板)。Wherein, the surface of the second side plate 12 is parallel to the surface of the electrode sheet; the surface of the second side plate 12 and the first side plate 11 are not parallel, for example, perpendicular; the second side plate 12 can be, for example, a bottom side plate (or bottom plate). ).
此外，第一绝缘部61与第一连接片31相接的一面和第二绝缘部62与第二连接片32相接的一面之间形成有夹角，该夹角的范围可以为80°～140°，例如80°、90°、100°、110°、120°、130°、140°等，即二者不平行，例如垂直。第一绝缘部61与第二绝缘部62(二者所在平面)之间形成的夹角范围可以为80°～140°，例如80°、90°、100°、110°、120°、130°、140°等，即二者不平行，例如垂直。In addition, an included angle is formed between the surface of the first insulating part 61 and the first connecting piece 31 and the surface of the second insulating part 62 and the second connecting piece 32. The included angle may range from 80° to 80°. 140°, such as 80°, 90°, 100°, 110°, 120°, 130°, 140°, etc., that is, the two are not parallel, such as perpendicular. The included angle formed between the first insulating part 61 and the second insulating part 62 (the plane where they are located) may range from 80° to 140°, such as 80°, 90°, 100°, 110°, 120°, 130°. , 140°, etc., that is, they are not parallel, such as perpendicular.
此外，电池还包括与第二极耳22电连接的第二导接件3’，第二导接件3’ 位于腔体内；第二导接件3’包括第四连接片32’，第二极耳22包括与第四连接片32’相接的第四连接部222。其中，第四连接部222与第四连接片32’相接的一面和极片的延伸方向(即极片的表面)基本平行，具体地，第四连接部222与第四连接片32’层叠设置，第四连接部222的表面、第四连接片32’的表面与极片的表面基本平行。In addition, the battery also includes a second conductor 3' electrically connected to the second tab 22. The second conductor 3' Located in the cavity; the second conductive member 3' includes a fourth connecting piece 32', and the second tab 22 includes a fourth connecting portion 222 connected to the fourth connecting piece 32'. The side of the fourth connecting portion 222 that is in contact with the fourth connecting piece 32' is substantially parallel to the extending direction of the pole piece (ie, the surface of the pole piece). Specifically, the fourth connecting portion 222 is stacked with the fourth connecting piece 32'. It is provided that the surface of the fourth connecting part 222, the surface of the fourth connecting piece 32' and the surface of the pole piece are substantially parallel.
一般情况下，第二极耳22的第四连接部222在第一侧板11上的投影与第一导接件的第四连接片32’在第一侧板11上的投影的边界接触，但除接触的边界外的其余部分不互相重叠。Generally, the projection of the fourth connecting portion 222 of the second tab 22 on the first side panel 11 is in contact with the boundary of the projection of the fourth connecting piece 32' of the first guide member on the first side panel 11. But the remaining parts except the touching boundaries do not overlap each other.
在一些实施例中，壳体1包括与第一侧板11相连的第二侧板12，第二极耳22还包括与第四连接部222相连的第三连接部221，第三连接部221与电芯2连接，其中，第四连接部222背离第二侧板12的一侧与第二导接件3’连接，具体可以与第二导接件3’的第四连接片32’连接，即第二侧板12、第四连接部222、第四连接片32’依次层叠设置，第四连接部222位于第二侧板12与第四连接片32’之间；或者，第四连接部222面向第二侧板12的一侧与第二导接件3’连接，具体可以与第二导接件3’的第四连接片32’连接，即第二侧板12、第四连接片32’、第四连接部222依次层叠设置，第四连接片32’位于第二侧板12与第四连接部222之间。由此，可以提高第二极耳22与第二导接件3’之间的连接稳定性，同时节约腔体空间，提高电池的能量密度等性能。In some embodiments, the housing 1 includes a second side plate 12 connected to the first side plate 11 , and the second tab 22 further includes a third connecting part 221 connected to the fourth connecting part 222 . The third connecting part 221 Connected to the battery core 2, wherein the side of the fourth connecting portion 222 away from the second side plate 12 is connected to the second conductive member 3', specifically, it can be connected to the fourth connecting piece 32' of the second conductive member 3'. , that is, the second side plate 12, the fourth connecting part 222, and the fourth connecting piece 32' are stacked in sequence, and the fourth connecting part 222 is located between the second side plate 12 and the fourth connecting piece 32'; or, the fourth connection The side of the portion 222 facing the second side plate 12 is connected to the second guide member 3', specifically, it can be connected to the fourth connecting piece 32' of the second guide member 3', that is, the second side plate 12, the fourth connection piece 32'. The piece 32' and the fourth connecting part 222 are stacked in sequence, and the fourth connecting piece 32' is located between the second side plate 12 and the fourth connecting part 222. As a result, the connection stability between the second tab 22 and the second conductive member 3' can be improved, while the cavity space can be saved, and the energy density and other performance of the battery can be improved.
在一些实施例中，第三连接部221与电芯2相接的一面和第四连接部222与第四连接片32’相接的一面之间形成有第二夹角，第二夹角的范围为80-120°，例如80°、90°、100°、120°等。In some embodiments, a second included angle is formed between the side of the third connecting portion 221 that connects with the battery core 2 and the side that connects the fourth connecting portion 222 with the fourth connecting piece 32'. The range is 80-120°, such as 80°, 90°, 100°, 120°, etc.
具体地，第二极耳22的第三连接部221的表面可以与第四连接部222的表面垂直，第三连接部221的表面可以与极片表面垂直，第四连接部222的表面可以与极片表面平行。Specifically, the surface of the third connecting part 221 of the second tab 22 may be perpendicular to the surface of the fourth connecting part 222 , the surface of the third connecting part 221 may be perpendicular to the surface of the pole piece, and the surface of the fourth connecting part 222 may be perpendicular to the surface of the pole piece. The pole piece surfaces are parallel.
此外，第二导接件3’还包括与第四连接片32’相连的第三连接片31’；第三连接片31’位于第一侧板11与第二极耳22之间，具体可以位于第一侧板11与第二极耳22的第三连接部221之间，第三连接片31’与第三连接部221之间的距离可以等于或大于第四连接部222(或第四连接片32’)在沿第三连接部221至第三连接片31’的方向上的长度。 In addition, the second conductive member 3' also includes a third connecting piece 31' connected to the fourth connecting piece 32'; the third connecting piece 31' is located between the first side plate 11 and the second tab 22. Specifically, Located between the first side plate 11 and the third connection part 221 of the second tab 22 , the distance between the third connection piece 31 ′ and the third connection part 221 may be equal to or greater than the fourth connection part 222 (or the fourth connection part 221 ). The length of the connecting piece 32') in the direction from the third connecting portion 221 to the third connecting piece 31'.
在一些实施例中，第三连接片31’所在平面和第四连接片32’所在平面之间形成有第二夹角，第二夹角的范围为80-120°，例如80°、90°、100°、120°等。In some embodiments, a second included angle is formed between the plane where the third connecting piece 31' is located and the plane where the fourth connecting piece 32' is located. The second included angle ranges from 80° to 120°, such as 80° or 90°. , 100°, 120°, etc.
此外，第二极耳22设置在第二极片上，每个第二极片上至少设有一个第二极耳22(即第二极耳22的数量为多个)，该多个第二极耳22的第四连接部222依次贴合组成第二极耳板，第二极耳板与第二导接件3’连接，以实现第二极耳22与第二导接件3’连接，具体可以与第二导接件3’的第四连接片32’连接。In addition, the second pole tab 22 is provided on the second pole piece, and each second pole piece is provided with at least one second pole tab 22 (that is, the number of the second pole tabs 22 is multiple). The plurality of second pole tabs 22 are arranged on the second pole piece. The fourth connecting portions 222 of 22 are sequentially fitted to form a second tab plate, and the second tab plate is connected to the second conductive member 3' to realize the connection between the second tab 22 and the second conductive member 3'. Specifically, It can be connected with the fourth connecting piece 32' of the second guide member 3'.
在一些实施例中，如图1所示，第二极耳22的第四连接部222朝向靠近第二侧板12的方向贴合，形成第二极耳板，即第二极耳板至第二侧板12的距离小于第二极耳板至第三侧板13的距离。In some embodiments, as shown in FIG. 1 , the fourth connecting portion 222 of the second tab 22 is attached toward the second side plate 12 to form a second tab plate, that is, the second tab plate to the second tab plate. The distance between the two side plates 12 is smaller than the distance from the second tab plate to the third side plate 13 .
在另一些实施例中，第二极耳22的第四连接部222朝向靠近第三侧板13的方向贴合，形成第二极耳板，即第二极耳板至第三侧板13的距离小于第二极耳板至第二侧板12的距离。In other embodiments, the fourth connecting portion 222 of the second tab 22 is attached in a direction close to the third side plate 13 to form a second tab plate, that is, from the second tab plate to the third side plate 13 . The distance is smaller than the distance from the second tab plate to the second side plate 12 .
在另一些实施例中，第二极耳22的第四连接部222朝向电芯2的厚度方向上的中心线贴合，形成第二极耳板，即第二极耳板至第二侧板12的距离与第二极耳板至第三侧板13的距离可以基本相等。In other embodiments, the fourth connecting portion 222 of the second tab 22 is aligned toward the centerline in the thickness direction of the battery core 2 to form a second tab plate, that is, the second tab plate to the second side plate. The distance 12 may be substantially equal to the distance from the second tab plate to the third side plate 13 .
一般情况下，在沿电芯2的厚度方向上，第二极耳22、以及由多个第二极耳22的第四连接部222贴合形成的第二极耳板不伸出电芯2的外缘，具体地，第二极耳22的第四连接部222/第二极耳板至第二侧板12的距离可以大于或等于电芯2至第二侧板12的距离，第二极耳22的第四连接部222/第二极耳板至第三侧板13的距离可以大于或等于电芯2至第三侧板13的距离。这样，与第四连接部222/第二极耳板相连的第四连接片32’在第一侧板11上的投影至少部分位于电芯2在第一侧板11上的投影内，可以减小腔体在沿第二侧板12至第三侧板13的方向上的空间浪费，提高电池的能量密度等性能。Generally, in the thickness direction of the battery core 2 , the second tab 22 and the second tab plate formed by the fourth connecting portions 222 of the plurality of second tabs 22 do not protrude from the battery core 2 The outer edge of the second tab 22 , specifically, the distance from the fourth connection portion 222 / second tab plate of the second tab 22 to the second side plate 12 may be greater than or equal to the distance from the battery core 2 to the second side plate 12 . The distance from the fourth connecting portion 222/second tab plate of the tab 22 to the third side plate 13 may be greater than or equal to the distance from the battery core 2 to the third side plate 13 . In this way, the projection of the fourth connecting piece 32' connected to the fourth connecting portion 222/the second lug plate on the first side plate 11 is at least partially located within the projection of the battery core 2 on the first side plate 11, which can reduce the problem. The small cavity wastes space in the direction from the second side plate 12 to the third side plate 13 and improves the energy density and other performance of the battery.
具体地，以第四连接片32’设置在第四连接部222/第二极耳板面向第二侧板12的一侧为例，在沿第四连接部222/第二极耳板至第二侧板12的方向上，第四连接片32’至少部分延伸至第四连接部222/第二极耳板与电芯2面向第二侧板12的一侧之间(即第四连接片32’延伸至第四连接部222/第二极耳板与电芯2面向第二侧板12的一侧之间的部分在第一侧板11上的投影位于电芯 2在第一侧板11上的投影内)，以与第四连接部222/第二极耳板连接(但不与延伸部23接触)。Specifically, taking the fourth connecting piece 32' being disposed on the side of the fourth connecting portion 222/second tab plate facing the second side plate 12 as an example, along the fourth connecting portion 222/second tab plate to the third In the direction of the two side plates 12, the fourth connecting piece 32' extends at least partially between the fourth connecting portion 222/the second tab plate and the side of the battery core 2 facing the second side plate 12 (i.e., the fourth connecting piece 32' extends to the fourth connecting portion 222/second lug plate and the side of the battery core 2 facing the second side plate 12, and the projection on the first side plate 11 is located on the battery core. 2 within the projection on the first side plate 11) to be connected with the fourth connecting portion 222/second lug plate (but not in contact with the extending portion 23).
此外，在一些实施例中，沿电芯2至第一侧板11的方向，延伸部23可以与第二极耳板/第二极耳21持平，或者延伸部23比第二极耳板/第二极耳21更靠近第一侧板11，即第二极耳板/第二极耳22至第一侧板11的距离等于或大于延伸部23至第一侧板11的距离，这样有利于进一步提高电池的能量密度。但不局限于此，在另一些实施例中，第二极耳板/第二极耳22可以比延伸部23更靠近第一侧板11，即第二极耳板/第二极耳22至所述第一侧板11的距离小于延伸部23至第一侧板11的距离，亦即，在电芯2至第一侧板11的方向上，第二极耳板/第二极耳22远离电芯2的一端位于延伸部23与第一侧板11之间，相对更利于第二极耳22/第二极耳板与第四连接片32’连接，增大二者接触面积，提高稳定性。In addition, in some embodiments, along the direction from the battery core 2 to the first side plate 11 , the extension portion 23 may be level with the second tab plate/second tab 21 , or the extension portion 23 may be larger than the second tab plate/ The second tab 21 is closer to the first side plate 11 , that is, the distance from the second tab plate/second tab 22 to the first side plate 11 is equal to or greater than the distance from the extension 23 to the first side plate 11 , so that It is beneficial to further improve the energy density of the battery. But it is not limited thereto. In other embodiments, the second tab plate/second tab 22 may be closer to the first side plate 11 than the extension 23 , that is, the second tab plate/second tab 22 is The distance between the first side plate 11 is less than the distance from the extension 23 to the first side plate 11 , that is, in the direction from the battery core 2 to the first side plate 11 , the second tab plate/second tab 22 The end far away from the battery core 2 is located between the extension 23 and the first side plate 11, which is relatively more conducive to the connection between the second tab 22/the second tab plate and the fourth connecting piece 32', increasing the contact area between the two and improving the efficiency of the connection. stability.
此外，第二导接件3’在第二侧板12上的投影与延伸部23在第二侧板12上的投影不重叠，即第三连接片31’在第二侧板12上的投影、第四连接片32’在第二侧板12上的投影均分别与延伸部23在第二侧板12上的投影不重叠。In addition, the projection of the second guide member 3' on the second side panel 12 does not overlap with the projection of the extension portion 23 on the second side panel 12, that is, the projection of the third connecting piece 31' on the second side panel 12. The projection of the fourth connecting piece 32' on the second side panel 12 does not overlap with the projection of the extension portion 23 on the second side panel 12 respectively.
此外，电池还包括设置在第一侧板11背离腔体的一侧的第二外接片41’，第二外接片41’包括向外凸起形成的第二极柱，第一侧板11设有与第二极柱对应设置的第七通孔120，第二极柱通过第七通孔120与第三连接片31’连接。In addition, the battery also includes a second external connection piece 41' provided on the side of the first side plate 11 away from the cavity. The second external connection piece 41' includes a second pole formed by protruding outwards. The first side plate 11 is provided with There is a seventh through hole 120 provided corresponding to the second pole, and the second pole is connected to the third connecting piece 31' through the seventh through hole 120.
此外，第三连接片31’包括与第二极柱对应设置的第五通孔30’，第二极柱穿透第一侧板11(即穿过第七通孔120)、并通过第五通孔30’与第三连接片31’相接。其中，第二极柱穿过第七通孔120，以实现穿透第一侧板11，第七通孔120与第五通孔30’可以同轴设置。In addition, the third connecting piece 31' includes a fifth through hole 30' corresponding to the second pole. The second pole penetrates the first side plate 11 (ie, passes through the seventh through hole 120) and passes through the fifth through hole 30'. The through hole 30' is connected to the third connecting piece 31'. The second pole passes through the seventh through hole 120 to penetrate the first side plate 11. The seventh through hole 120 and the fifth through hole 30' can be coaxially arranged.
一般情况下，第二极柱垂直于第二极柱的轴向的横截面为圆形，示例性地，第二极柱可以是圆柱形，或者，第二极柱为锥形结构，即沿从第一侧板11至第三连接片31’的方向，第二极柱的直径呈增大或减小趋势，第二极柱直径即为第二极柱垂直于第二极柱的轴向的横截面的直径。Generally, the cross-section of the second pole perpendicular to the axial direction of the second pole is circular. For example, the second pole can be cylindrical, or the second pole has a tapered structure, that is, along the In the direction from the first side plate 11 to the third connecting piece 31', the diameter of the second pole shows an increasing or decreasing trend. The diameter of the second pole is the axial direction of the second pole perpendicular to the second pole. The diameter of the cross section.
具体地，当第二极柱为锥形结构时，沿从第一侧板11至第三连接片31’的方向，第二极柱的直径呈变化趋势(即增大或减小趋势)，该变化可以是逐渐变化，即以基本相同的幅度均匀增大或减小。第七通孔120、第五通孔30’的孔径(直径)随第二极柱的直径相应变化，例如，沿从第一侧板11至 第三连接片31’的方向，第二极柱的直径逐渐增大，此时第七通孔120、第五通孔30’的孔径也逐渐增大；沿从第一侧板11至第三连接片31’的方向，第二极柱的直径逐渐减小，此时第七通孔120、第五通孔30’的孔径也逐渐减小。Specifically, when the second pole has a tapered structure, the diameter of the second pole shows a changing trend (i.e., increases or decreases) in the direction from the first side plate 11 to the third connecting piece 31'. The change may be a gradual change, that is, a uniform increase or decrease with substantially the same amplitude. The aperture (diameter) of the seventh through hole 120 and the fifth through hole 30' changes correspondingly with the diameter of the second pole, for example, along the direction from the first side plate 11 to In the direction of the third connecting piece 31', the diameter of the second pole gradually increases. At this time, the diameters of the seventh through hole 120 and the fifth through hole 30' also gradually increase; along the direction from the first side plate 11 to the third In the direction of the connecting piece 31', the diameter of the second pole gradually decreases. At this time, the diameters of the seventh through hole 120 and the fifth through hole 30' also gradually decrease.
在一些实施例中，第三连接片31’的第五通孔30’包括相互连接的第三孔段和第四孔段，第四孔段位于第三孔段靠近电芯2的一侧；第二极柱靠近电芯2的一端向外延伸形成有与第四孔段对应设置的第二外延部。In some embodiments, the fifth through hole 30' of the third connecting piece 31' includes a third hole section and a fourth hole section connected to each other, and the fourth hole section is located on the side of the third hole section close to the battery core 2; One end of the second pole close to the battery core 2 extends outward to form a second extension portion corresponding to the fourth hole section.
具体地，第三孔段与第四孔段可以同轴设置，第三孔段、第四孔段均为圆形通孔，第四孔段的直径大于第三孔段与第四孔段相接的一端的直径，优选地，第四孔段的直径大于第三孔段的直径，第四孔段垂直于第五通孔30’的轴向的投影可以覆盖第三孔段垂直于第五通孔30’的轴向的投影。Specifically, the third hole section and the fourth hole section can be arranged coaxially, the third hole section and the fourth hole section are both circular through holes, and the diameter of the fourth hole section is larger than that of the third hole section and the fourth hole section. The diameter of the connected end, preferably, the diameter of the fourth hole segment is larger than the diameter of the third hole segment, and the axial projection of the fourth hole segment perpendicular to the fifth through hole 30' can cover the third hole segment perpendicular to the fifth through hole 30'. Axial projection of through hole 30'.
此外，第二外接片41’垂直于第二极柱的轴向的横截面面积可以大于第二极柱垂直于第二极柱的轴向的横截面面积，第二外接片41’垂直于第二极柱的轴向的投影覆盖第二极柱垂直于第二极柱的轴向的投影，第二外延部垂直于第二极柱的横截面面积大于第二极柱垂直于第二极柱轴向的横截面面积，第二外延部垂直于第二极柱的轴向的投影覆盖第二极柱垂直于第二极柱的轴向的投影，第二外接片41’垂直于第二极柱的轴向的横截面面积大于第二外延部垂直于第二极柱的轴向的横截面面积，第二外接片41’垂直于第二极柱的轴向的投影覆盖第二外延部垂直于第二极柱的轴向的投影，第二外延部垂直于第二极柱的轴向的横截面面积基本等于第四孔段垂直于第二极柱的轴向(亦为第五通孔30’的轴向)的横截面面积，第二外延部卡合在第四孔段，与第四孔段的侧壁相接。In addition, the cross-sectional area of the second external piece 41' perpendicular to the axial direction of the second pole may be larger than the cross-sectional area of the second pole perpendicular to the axial direction of the second pole. The second external piece 41' is perpendicular to the axial direction of the second pole. The axial projection of the second pole covers the axial projection of the second pole perpendicular to the second pole, and the cross-sectional area of the second extension perpendicular to the second pole is larger than the second pole perpendicular to the second pole. The axial cross-sectional area, the projection of the second extension perpendicular to the axial direction of the second pole covers the projection of the second pole perpendicular to the axial direction of the second pole, and the second external piece 41' is perpendicular to the second pole The axial cross-sectional area of the column is larger than the cross-sectional area of the second extension perpendicular to the axial direction of the second pole, and the projection of the second external piece 41' perpendicular to the axial direction of the second pole covers the second extension perpendicularly. In the projection of the axial direction of the second pole, the cross-sectional area of the second extension perpendicular to the axial direction of the second pole is substantially equal to the fourth hole section perpendicular to the axial direction of the second pole (also the fifth through hole). The second extension is engaged with the fourth hole section and connected with the side wall of the fourth hole section.
在一些实施例中，第二极柱的靠近电芯2的一端面与第三连接片31’的靠近电芯2的一侧表面齐平。具体地，第二外延部沿第五通孔30’的轴向的厚度基本等于第四孔段沿第五通孔30’的轴向的深度，由此，第二外延部卡扣在第四孔段中，第二外延部靠近电芯2的一端面与第三连接片31’面向电芯2的一侧表面齐平。In some embodiments, an end surface of the second pole close to the battery core 2 is flush with a side surface of the third connecting piece 31' close to the battery core 2. Specifically, the thickness of the second extension portion along the axial direction of the fifth through hole 30' is substantially equal to the depth of the fourth hole segment along the axial direction of the fifth through hole 30', whereby the second extension portion snaps into place on the fourth through hole 30'. In the hole section, an end surface of the second extension portion close to the battery core 2 is flush with a side surface of the third connecting piece 31 ′ facing the battery core 2 .
在另一些实施例中，第二极柱靠近电芯2的一端伸出第五通孔30’、并沿第五通孔30’的周向向外延伸形成有与第三连接片31’靠近电芯2的一侧表面相接的第二外延部，即第二极柱靠近电芯2的一端面不与第三连接片31’面向电芯2的一侧表面齐平，而是位于第三连接片31’与电芯2之间。 In other embodiments, one end of the second pole close to the battery core 2 protrudes from the fifth through hole 30', and extends outward along the circumferential direction of the fifth through hole 30' to be close to the third connecting piece 31'. The second extension portion connected to one side surface of the battery core 2, that is, the end surface of the second pole close to the battery core 2 is not flush with the side surface of the third connecting piece 31' facing the battery core 2, but is located on the third connecting piece 31'. Between the three connecting pieces 31' and the battery core 2.
其中，第二外接片41’、第二极柱、第二外延部可以一体成型，其可以是金属材质，具体实施时，可以使第三连接片31’与第一侧板11通过铆钉进行铆接，经铆接之后，铆钉位于第一侧板11背离腔体的一端形成第二外接片41’，另一端形成第二外延部，而其两端之间的部分形成第二极柱，所形成的的第二极柱例如是锥形结构。Among them, the second external connecting piece 41', the second pole, and the second extension part can be integrally formed, and they can be made of metal. In specific implementation, the third connecting piece 31' and the first side plate 11 can be riveted through rivets. , after riveting, the rivet is located at one end of the first side plate 11 away from the cavity to form the second external piece 41', the other end forms the second extension, and the part between the two ends forms the second pole, forming The second pole is, for example, a conical structure.
具体地，第二极耳22可以和壳体1电连接，此时第二外接片41’、第二极柱、第二导接件3’的第三连接片31’可以和壳体1直接接触，或者，如图4所示，第二转接的第四连接片32’与壳体1的第二侧板12(或第三侧板13)焊接(可以不设置第三31’连接片、以及第二外接片41’等)。第二极耳22与壳体1也可以绝缘连接，具体可以通过设置绝缘片(绝缘层)进行绝缘。Specifically, the second tab 22 can be electrically connected to the housing 1. At this time, the second external connecting piece 41', the second pole, and the third connecting piece 31' of the second conductive member 3' can be directly connected to the housing 1. contact, or, as shown in Figure 4, the fourth connecting piece 32' of the second transition is welded to the second side plate 12 (or the third side plate 13) of the housing 1 (the third connecting piece 31' may not be provided , and the second external piece 41', etc.). The second tab 22 and the housing 1 may also be insulatedly connected. Specifically, they may be insulated by providing an insulating sheet (insulating layer).
在一些实施例中，如图1、图3至图6所示，第二外接片41’与第一侧板11之间还设有第三绝缘片5’，第二导接件3’与第一侧板11之间还设有第四绝缘片6’，第二极柱穿透第三绝缘片5’和第四绝缘片6’，第二极柱与第一侧板11之间设有第二绝缘层，由此，第二外接片41’、第二极柱、第二导接件3’和第二极耳22电连接，而与第一侧板11(壳体1)绝缘连接。In some embodiments, as shown in Figures 1, 3 to 6, a third insulating piece 5' is disposed between the second external piece 41' and the first side plate 11, and the second conductive member 3' and There is also a fourth insulating sheet 6' between the first side plates 11. The second pole penetrates the third insulating sheet 5' and the fourth insulating sheet 6'. There is a fourth insulating sheet 6' between the second pole and the first side plate 11. There is a second insulating layer, whereby the second external piece 41', the second pole, the second conductor 3' and the second tab 22 are electrically connected and insulated from the first side plate 11 (casing 1) connect.
其中，第四绝缘片6’具体可以位于第三连接片31’与第一侧板11之间，即第二外接片41’、第三绝缘片5’、第一侧板11、第四绝缘片6’、第三连接片31’依次层叠设置。Among them, the fourth insulating piece 6' can be specifically located between the third connecting piece 31' and the first side plate 11, that is, the second external connecting piece 41', the third insulating piece 5', the first side plate 11, the fourth insulating piece The piece 6' and the third connecting piece 31' are stacked in sequence.
此外，沿第五通孔30’的周向，第五通孔30’的孔径与极柱的直径之差基本等于第二绝缘层沿第五通孔30’的周向的宽度，该第五通孔30’的周向与第五通孔30’的轴向垂直。具体地，第二绝缘层可以与第三绝缘片5’一体成型，第二绝缘层由第三绝缘片5’靠近第一侧板11的一侧向外凸起(向第七通孔120内凸起)形成；或者，第二绝缘层可以与第四绝缘片6’一体成型，第二绝缘层由第四绝缘片6’靠近第一侧板11的一侧向外凸起(向第七通孔120内凸起)形成。In addition, along the circumferential direction of the fifth through hole 30', the difference between the diameter of the fifth through hole 30' and the diameter of the pole is substantially equal to the width of the second insulating layer along the circumferential direction of the fifth through hole 30'. The circumferential direction of the through hole 30' is perpendicular to the axial direction of the fifth through hole 30'. Specifically, the second insulating layer may be integrally formed with the third insulating sheet 5 ′, and the second insulating layer protrudes outward from the side of the third insulating sheet 5 ′ close to the first side plate 11 (into the seventh through hole 120 protrusions); alternatively, the second insulating layer can be integrally formed with the fourth insulating sheet 6', and the second insulating layer protrudes outward (toward the seventh side) from the side of the fourth insulating sheet 6' close to the first side plate 11. The through hole 120 is formed with an inner protrusion).
相应地，第三绝缘片5’设有第八通孔50’，第二极柱穿过第八通孔50’，以实现穿透第三绝缘片5’；第四绝缘片6’设有第六通孔60’，第二极柱穿过第六通孔60’，以实现穿透第四绝缘片6’。具体地，第二极柱依次穿过第八通孔50’、第七通孔120、第六通孔60’、第五通孔30’，以实现与第二导接件3’连接。其中，第八通孔50’、第七通孔120、第六通孔60’、第五通孔30’可以 同轴设置。Correspondingly, the third insulating sheet 5' is provided with an eighth through hole 50', and the second pole passes through the eighth through hole 50' to achieve penetration of the third insulating sheet 5'; the fourth insulating sheet 6' is provided with The second pole passes through the sixth through hole 60' to penetrate the fourth insulating sheet 6'. Specifically, the second pole passes through the eighth through hole 50', the seventh through hole 120, the sixth through hole 60', and the fifth through hole 30' in order to achieve connection with the second conductive member 3'. Among them, the eighth through hole 50', the seventh through hole 120, the sixth through hole 60', and the fifth through hole 30' can be Coaxial setup.
此外，第三绝缘片5’在第一侧板11上的投影可以覆盖第二外接片41’在第一侧板11上的投影(即第二外接片41’在第一侧板11上的投影位于第三绝缘片5’在第一侧板11上的投影内)。第四绝缘片6’在第一侧板11上的投影可以覆盖第三连接片31’在第一侧板11上的投影，由此，可以进一步提高电池安全性和稳定性等性能。In addition, the projection of the third insulating sheet 5' on the first side panel 11 can cover the projection of the second external sheet 41' on the first side panel 11 (that is, the projection of the second external sheet 41' on the first side panel 11 The projection is located within the projection of the third insulating sheet 5' on the first side panel 11). The projection of the fourth insulating sheet 6' on the first side plate 11 can cover the projection of the third connecting piece 31' on the first side plate 11, thereby further improving battery safety and stability.
具体地，第四绝缘片6’可以是L型结构，其包括第三绝缘部61’和第四绝缘部62’；第三绝缘部61’位于第一侧板11与第二导接件3’之间，第二极柱穿透第三绝缘部61’(即第六通孔60’设置在第三绝缘部61’上)；第四绝缘部62’位于第二侧板12与第二导接件3’之间，具体可以位于第二侧板12与第四连接片32’之间，即第二侧板12、第四绝缘部62’、第四连接片32’依次层叠设置，由此，通过第四绝缘部62’，可以为第二导接件3’提供支撑，并可以使第二导接件3’与壳体1的第二侧板12之间绝缘，提高电池的安全性和稳定性等性能。Specifically, the fourth insulating sheet 6' may be an L-shaped structure, which includes a third insulating part 61' and a fourth insulating part 62'; the third insulating part 61' is located between the first side plate 11 and the second conductor 3 ', the second pole penetrates the third insulating part 61' (that is, the sixth through hole 60' is provided on the third insulating part 61'); the fourth insulating part 62' is located between the second side plate 12 and the second Between the conductive members 3', specifically between the second side plate 12 and the fourth connecting piece 32', that is, the second side plate 12, the fourth insulating part 62', and the fourth connecting piece 32' are stacked in sequence. Therefore, the fourth insulating portion 62' can provide support for the second conductive member 3', and can insulate the second conductive member 3' from the second side plate 12 of the housing 1, thereby improving the battery's performance. performance such as security and stability.
其中，第三绝缘部61’在第一侧板11上的投影覆盖第二导接件3’在第一侧板11上的投影(覆盖第三连接片31’在第一侧板11上的投影)，第四绝缘部62’在第二侧板12上的投影覆盖第二导接件3’在第二侧板12上的投影(覆盖第四连接片32’在第二侧板12上的投影)。Wherein, the projection of the third insulating part 61' on the first side plate 11 covers the projection of the second conductor 3' on the first side plate 11 (covers the projection of the third connecting piece 31' on the first side plate 11 Projection), the projection of the fourth insulating portion 62' on the second side plate 12 covers the projection of the second conductor 3' on the second side plate 12 (covers the fourth connecting piece 32' on the second side plate 12 projection).
此外，第三绝缘部61’与第三连接片31’相接的一面和第四绝缘部62’与第四连接片32’相接的一面之间形成有夹角，该夹角的范围可以为80°～140°，例如80°、90°、100°、110°、120°、130°、140°等，即二者不平行，例如垂直。第三绝缘部61’与第四绝缘部62’(二者所在平面)之间形成的夹角范围可以为80°～140°，例如80°、90°、100°、110°、120°、130°、140°等，即二者不平行，例如垂直。In addition, an included angle is formed between the surface of the third insulating part 61' and the third connecting piece 31' and the surface of the fourth insulating part 62' and the fourth connecting piece 32'. The range of the included angle can be It is 80° to 140°, such as 80°, 90°, 100°, 110°, 120°, 130°, 140°, etc., that is, the two are not parallel, such as perpendicular. The included angle formed between the third insulating part 61' and the fourth insulating part 62' (the plane where they are located) may range from 80° to 140°, such as 80°, 90°, 100°, 110°, 120°, 130°, 140°, etc., that is, the two are not parallel, such as perpendicular.
具体地，第一极耳板与第二连接片32可以焊接、第二极耳板与第四连接片可以焊接。Specifically, the first tab plate and the second connecting piece 32 can be welded, and the second tab plate and the fourth connecting piece can be welded.
此外，电池还可以包括缓冲片9，缓冲片9位于电芯2和第一侧板11之间，具体可以位于延伸部23与第一侧板11之间、以及第一连接片31与第一连接部211之间、第三连接片31’与第三连接部221之间，由此可以避免电芯2与壳体1接触，同时当电芯2与第一侧板11之间发生撞击时可以起到缓冲 作用，避免电芯2或壳体1损伤，提高电池的抗跌落和抗撞击能力，进而提高电池的安全性等性能。此外，缓冲片还可以起到绝缘作用。In addition, the battery may also include a buffer piece 9 , which is located between the battery core 2 and the first side plate 11 , specifically between the extension part 23 and the first side plate 11 , and between the first connecting piece 31 and the first side plate 11 . Between the connecting parts 211 and between the third connecting piece 31' and the third connecting part 221, it is possible to avoid contact between the battery core 2 and the housing 1, and at the same time, when an impact occurs between the battery core 2 and the first side plate 11 Can act as a buffer function to avoid damage to the battery core 2 or the casing 1, improve the battery's resistance to falling and impact, and thereby improve the safety and other performance of the battery. In addition, the buffer sheet can also play an insulating role.
在一些实施例中，缓冲片9包括相连的第一缓冲部91和第二缓冲部92，第一缓冲部91位于延伸部23与第一侧板11之间，第二缓冲部92位于第一极耳21的第一连接部211与第一导接件的第一连接片31之间。In some embodiments, the buffer sheet 9 includes a connected first buffer part 91 and a second buffer part 92. The first buffer part 91 is located between the extension part 23 and the first side plate 11, and the second buffer part 92 is located between the first side plate 11 and the extension part 23. between the first connecting portion 211 of the pole lug 21 and the first connecting piece 31 of the first conductive member.
此外，缓冲片9还包括与第一缓冲部91相连的第三缓冲部93，第三缓冲部位于第二极耳22的第三连接部221与第二导接件3’的第三连接片31’之间。In addition, the buffer piece 9 also includes a third buffer part 93 connected to the first buffer part 91. The third buffer part is located between the third connecting part 221 of the second tab 22 and the third connecting piece of the second conductor 3'. Between 31'.
具体地，第一缓冲部91的宽度大于或等于第二缓冲部92的宽度，第一缓冲部91的宽度大于或等于第三缓冲部93的宽度，第二缓冲部92的宽度与第三缓冲部93的宽度可以相等或不等。其中，第一缓冲部91的宽度、第二缓冲部92的宽度、第三缓冲部93的宽度是指在沿第三侧板13至第二侧板12的方向上的宽度。Specifically, the width of the first buffer portion 91 is greater than or equal to the width of the second buffer portion 92 , the width of the first buffer portion 91 is greater than or equal to the width of the third buffer portion 93 , and the width of the second buffer portion 92 is the same as that of the third buffer portion 93 . The widths of portions 93 may be equal or unequal. The width of the first buffer portion 91 , the width of the second buffer portion 92 , and the width of the third buffer portion 93 refer to the width in the direction from the third side plate 13 to the second side plate 12 .
一般情况下，第二缓冲部92设有第一凹槽，第一极耳21的第二连接部212延伸至第一凹槽内。在一些实施例中，沿电芯2的长度方向(电芯2至第一侧板11的方向)，第一极耳21的第二连接部212的端部延伸出第一凹槽，利于与第一导接件连接。Generally, the second buffer portion 92 is provided with a first groove, and the second connecting portion 212 of the first tab 21 extends into the first groove. In some embodiments, along the length direction of the battery core 2 (the direction from the battery core 2 to the first side plate 11 ), a first groove extends from the end of the second connecting portion 212 of the first tab 21 to facilitate connection with the battery core 2 . The first conductor is connected.
具体地，第一缓冲部91在电芯2的厚度方向上的投影(即该投影垂直于电芯2的厚度方向)与第一极耳21的第二连接部212以及第一导接件(第二连接片32)在电芯2的厚度方向上的投影部分重叠。第一凹槽的在电芯2的宽度方向上的长度大于或等于第一极耳21的第二连接部212在电芯2的宽度方向上的长度。第一凹槽的在电芯2的厚度方向上的长度大于或等于第一极耳21的第二连接部212在电芯2的厚度方向上的长度。Specifically, the projection of the first buffer portion 91 in the thickness direction of the battery core 2 (that is, the projection is perpendicular to the thickness direction of the battery core 2) is in contact with the second connecting portion 212 of the first tab 21 and the first conductive member ( The projected portions of the second connecting piece 32) in the thickness direction of the battery core 2 overlap. The length of the first groove in the width direction of the battery core 2 is greater than or equal to the length of the second connecting portion 212 of the first tab 21 in the width direction of the battery core 2 . The length of the first groove in the thickness direction of the battery core 2 is greater than or equal to the length of the second connecting portion 212 of the first tab 21 in the thickness direction of the battery core 2 .
此外，第三缓冲部93设有第二凹槽，第二极耳22的第四连接部222延伸至第二凹槽内。在一些实施例中，沿电芯2的长度方向，第二极耳22的第四连接部222的端部延伸出第二凹槽，利于与第二导接件3’连接。In addition, the third buffer portion 93 is provided with a second groove, and the fourth connecting portion 222 of the second tab 22 extends into the second groove. In some embodiments, along the length direction of the battery core 2, a second groove extends from the end of the fourth connecting portion 222 of the second tab 22 to facilitate connection with the second conductive member 3'.
具体地，第二连接部212/第一极耳板背离第二侧板的一侧(即第二连接部212/第一极耳板与第三侧板13之间)、第二连接部212/第一极耳板面向第二侧板的一侧(即第二连接部212/第一极耳板与第二侧板13之间)中的至少一者存在第二缓冲部92，第四连接部222/第二极耳板背离第二侧板的一侧(即 第四连接部222/第二极耳板与第三侧板13之间)、第四连接部222/第二极耳板面向第二侧板的一侧(即第四连接部222/第二极耳板与第二侧板13之间)中的至少一者存在第三缓冲部93。Specifically, the second connecting portion 212/the side of the first lug plate away from the second side plate (that is, between the second connecting portion 212/the first lug plate and the third side plate 13), the second connecting portion 212 /There is a second buffer portion 92 on at least one side of the first lug plate facing the second side plate (ie, the second connecting portion 212/between the first lug plate and the second side plate 13), and the fourth The connecting portion 222/the side of the second lug plate facing away from the second side plate (i.e. Between the fourth connection part 222/second tab plate and the third side plate 13), the side of the fourth connection part 222/the second tab plate facing the second side plate (that is, the fourth connection part 222/the second There is a third buffer portion 93 in at least one of the tab plates and the second side plate 13 .
具体地，第三缓冲部93在电芯2的厚度方向上的投影与第二极耳22的第四连接部222以及第二导接件3’(第四连接片32’)在电芯2的厚度方向上的投影部分重叠。第二凹槽的在电芯2的宽度方向上的长度大于或等于第二极耳22的第四连接部222在电芯2的宽度方向上的长度。第二凹槽的在电芯2的厚度方向上的长度大于或等于第二极耳22的第四连接部222在电芯2的厚度方向上的长度。Specifically, the projection of the third buffer portion 93 in the thickness direction of the battery core 2 is in line with the fourth connecting portion 222 of the second tab 22 and the second conductive member 3' (fourth connecting piece 32') of the battery core 2. The projections in the thickness direction partially overlap. The length of the second groove in the width direction of the battery core 2 is greater than or equal to the length of the fourth connecting portion 222 of the second tab 22 in the width direction of the battery core 2 . The length of the second groove in the thickness direction of the battery core 2 is greater than or equal to the length of the fourth connecting portion 222 of the second tab 22 in the thickness direction of the battery core 2 .
此外，第二凹槽在电芯2的宽度方向上的长度与第一凹槽在电芯2的宽度方向上的长度可以相等或不等，第二凹槽在电芯2的厚度方向上的长度与第一凹槽在电芯2的厚度方向上的长度可以相等或不等。In addition, the length of the second groove in the width direction of the battery core 2 may be equal to or different from the length of the first groove in the width direction of the battery core 2 , and the length of the second groove in the thickness direction of the battery core 2 The length may be equal to or different from the length of the first groove in the thickness direction of the battery core 2 .
此外，电芯2的宽度为a，缓冲片9在电芯2的宽度方向上的长度为b，0≤|a-b|≤3，a≥b，或者a≤b。In addition, the width of the battery core 2 is a, and the length of the buffer sheet 9 in the width direction of the battery core 2 is b, 0≤|a-b|≤3, a≥b, or a≤b.
电芯2具有相对设置的第一面和第二面，以及位于第一面和第二面之间的侧面，在电芯2的至少一侧的侧面的至少部分区域设有第一保护胶层71。The battery core 2 has a first surface and a second surface that are oppositely arranged, and a side surface located between the first surface and the second surface. A first protective glue layer is provided on at least part of the side surface of at least one side of the battery core 2 71.
具体地，位于电芯2的第一面和第二面之间的侧面(电芯2的侧面)是露出电芯2中的极片外缘的侧面，是由多个层叠设置的极片垂直于其厚度方向的端面形成，即电芯2的侧面平行于电芯2的厚度方向(亦为电极片的厚度方向)。Specifically, the side surface between the first surface and the second surface of the battery core 2 (the side surface of the battery core 2 ) is the side surface that exposes the outer edge of the pole piece in the battery core 2 , and is composed of a plurality of stacked vertical pole pieces. It is formed on the end surface in the thickness direction, that is, the side surface of the battery core 2 is parallel to the thickness direction of the battery core 2 (also the thickness direction of the electrode sheet).
电芯2的侧面包括依次相接的第一侧面、第二侧面、第三侧面、第四侧面，第一侧面是电芯2面向第一侧板11的端面(即电芯2设有第一极耳21和第二极耳22的一面，亦为电芯2面向第一侧板11的一面)，第二侧面与第四侧面位于第一侧面(或第三侧面)的相对两侧，第一侧面与第三侧面位于第二侧面(或第四侧面)的相对两侧。其中，第一侧面与第三侧面可以相互平行，第二侧面与第四侧面可以相互平行，第一侧面(或第三侧面)与第二侧面(或第四侧面)可以相互垂直，第一侧面至第三侧面的方向可以为电芯2的长度方向，而第二侧面至第四侧面为电芯2的宽度方向，或者，第一侧面至第三侧面的方向也可以为电芯2的宽度方向，而第二侧面至第四侧面为电芯2的长度方向。 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). The side of the tab 21 and the second tab 22 is also the side of the battery core 2 facing the first side plate 11), the second side and the fourth side are located on opposite sides of the first side (or the third side). One side and the third side are located on opposite sides of the second side (or the fourth side). Wherein, the first side and the third side can be parallel to each other, the second side and the fourth side can be parallel to each other, the first side (or third side) and the second side (or fourth side) can be perpendicular to each other, and the first side The direction to the third side may be the length direction of the battery core 2 , and the second side to the fourth side may be the width direction of the battery core 2 , or the direction from the first side to the third side may also be the width of the battery core 2 direction, and the second side to the fourth side are the length direction of the battery core 2 .
其中，第二侧面、第三侧面、第四侧面中的至少一者设有第一保护胶层71，即其中的一者或多者(如全部)设有第一保护胶层71，但不局限于此，第一侧面也可以设置第一保护胶层71。Wherein, at least one of the second side, the third side and the fourth side is provided with the first protective glue layer 71, that is, one or more (such as all) of them are provided with the first protective glue layer 71, but not Limited to this, a first protective glue layer 71 may also be provided on the first side.
此外，电芯2的任意一个侧面的第一保护胶层71的数量可以是一个或多个，当任意一个侧面的第一保护胶层71的数量为一个时，该侧面的第一保护胶层71沿该侧面的长度方向的长度可以不大于该侧面的长度，例如基本相等；当任意一个侧面的第一保护胶层71的数量为多个时，该多个第一保护胶层71间隔设置在电芯2的该侧面，由此在任意两个相邻的第一保护胶层71之间存在间隙，通过该间隙利于电解液浸润到电芯2中的极片中，进一步优化电池性能。In addition, the number of the first protective glue layer 71 on any side of the battery core 2 may be one or more. When the number of the first protective glue layer 71 on any one side is one, the number of the first protective glue layer 71 on any side of the battery core 2 may be one. The length of 71 along the length direction of the side may not be greater than the length of the side, for example, substantially equal; when the number of first protective glue layers 71 on any one side is multiple, the plurality of first protective glue layers 71 are arranged at intervals. On this side of the battery core 2, there is a gap between any two adjacent first protective adhesive layers 71. This gap facilitates the electrolyte to infiltrate into the pole pieces in the battery core 2, further optimizing battery performance.
以第二侧面为例，当第二侧面的第一保护胶层71的数量为一个时，第二侧面的第一保护胶层71在第二侧面的长度方向上的长度可以不大于第二侧面的长度，例如与第二侧面的长度基本相等；当第二侧面的第一保护胶层71的数量为多个时，该多个第一保护胶层71可以间隔分布在第二侧面。Taking the second side as an example, when the number of the first protective glue layer 71 on the second side is one, the length of the first protective glue layer 71 on the second side in the length direction of the second side may not be greater than that of the second side. The length is, for example, substantially equal to the length of the second side; when the number of the first protective glue layers 71 on the second side is multiple, the plurality of first protective glue layers 71 can be distributed at intervals on the second side.
在一些实施例中，第一保护胶层71延伸至电芯2的第一面并与位于电芯2的第一面的极片粘结和/或延伸至电芯2的第二面并与位于电芯2的第二面的极片粘接，由此，可以避免电芯2侧面露出的极片与壳体1接触，同时可以固定电芯2，提高电池的安全性和稳定性等性能。In some embodiments, the first protective adhesive layer 71 extends to the first side of the battery core 2 and is bonded to the pole pieces located on the first side of the battery core 2 and/or extends to the second side of the battery core 2 and is bonded to the second side of the battery core 2 . The pole pieces located on the second side of the battery core 2 are bonded. This prevents the exposed pole pieces from the side of the battery core 2 from contacting the case 1. At the same time, the battery core 2 can be fixed, improving the safety and stability of the battery. .
此外，第一保护胶层71可以设有一个或多个第九通孔，优选设有多个第五通孔30’，该多个第五通孔30’可以均匀或不均匀分布在第一保护胶层71与电芯2的侧面相对的部分(第一保护胶层71的该部分叠放在电芯2的侧面(如第二面))，由此，通过第五通孔30’可以提高电解液对电芯2的浸润性，使电解液更好地浸润到电极片中，进一步优化电池性能。尤其当电芯2的任意一个侧面的第一保护胶层71的数量为一个时，该侧面的第一保护胶层71可以设有一个或多个第五通孔30’。In addition, the first protective glue layer 71 may be provided with one or more ninth through holes, preferably a plurality of fifth through holes 30', and the plurality of fifth through holes 30' may be evenly or unevenly distributed in the first protective glue layer 71. The portion of the protective adhesive layer 71 that is opposite to the side of the battery core 2 (this part of the first protective adhesive layer 71 is stacked on the side of the battery core 2 (such as the second side)). Therefore, the fifth through hole 30' can be The wettability of the electrolyte to the battery core 2 is improved so that the electrolyte can better penetrate into the electrode sheet and further optimize the battery performance. Especially when the number of the first protective glue layer 71 on any side of the battery core 2 is one, the first protective glue layer 71 on this side may be provided with one or more fifth through holes 30'.
此外，延伸部23的第一面和/或延伸部23的第二面设有第二保护胶层72。其中，延伸部23的第一面至延伸部23的第二面的方向可以垂直于从第一极耳21至延伸部23的方向。In addition, a second protective glue layer 72 is provided on the first surface of the extension part 23 and/or the second surface of the extension part 23 . The direction from the first surface of the extension part 23 to the second surface of the extension part 23 may be perpendicular to the direction from the first tab 21 to the extension part 23 .
具体地，上述第一保护胶层71、第二保护胶层72具体可以是胶纸，一般具有绝缘性和粘性，其可以是本领域常规胶纸，对此不作特别限制。 Specifically, the first protective adhesive layer 71 and the second protective adhesive layer 72 may be adhesive paper, which generally has insulation and viscosity. It may be conventional adhesive paper in this field, and is not particularly limited.
具体地，第一极耳21和第二极耳22设置在电芯2面向第一侧板11的端面，电芯2的第一面和电芯2的第二面分别位于电芯2面向第一侧板11的端面的相对两侧，电芯2的第一面至电芯2的第二面的方向为电芯2的厚度方向(亦为电极片的厚度方向)，电芯2的第一面(表面)、电芯2的第二面(表面)与极片的表面可以平行(与极片的厚度方向垂直)。Specifically, the first tab 21 and the second tab 22 are disposed on the end surface of the battery core 2 facing the first side plate 11 , and the first surface of the battery core 2 and the second surface of the battery core 2 are respectively located on the end surface of the battery core 2 facing the first side plate 11 . On opposite sides of the end surface of one 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 thickness direction of the electrode sheet). One side (surface), the second side (surface) of the battery core 2 and the surface of the pole piece can be parallel (perpendicular to the thickness direction of the pole piece).
位于电芯2的第一面的极片、位于电芯2的第二面的极片分别是电芯2最外侧的极片，即其余极片层叠设置在位于电芯2的第一面的极片与位于电芯2的第二面的极片之间。位于电芯2的第一面的极片与位于电芯2的第二面的电极片的极性可以相同或不同，可以为正极片或负极片，可以为第一极片或第二极片，通常优选位于电芯2的第一面的极片与位于电芯2的第二面的极片为负极片。The pole piece located on the first side of the battery core 2 and the pole piece located on the second side of the battery core 2 are respectively the outermost pole pieces of the battery core 2 , that is, the remaining pole pieces are stacked on the first side of the battery core 2 between the pole piece and the pole piece located on the second side of the battery core 2 . The polarity of the electrode piece located on the first side of the battery core 2 and the polarity of the electrode piece located on the second side of the battery core 2 may be the same or different. They may be the positive electrode piece or the negative electrode piece, and may be the first pole piece or the second pole piece. , it is generally preferred that the pole piece located on the first side of the battery core 2 and the pole piece located on the second side of the battery core 2 are negative electrode pieces.
电芯2可以包括叠片式电芯2和/或卷绕式电芯2，卷绕式电芯2是由多个电极片层叠设置后经卷绕而成，具体是由第一极片、隔膜、第二极片依次层叠设置后卷绕而成；叠片式电芯2具体是由第一电极片、隔膜、第二电极片依次层叠设置而成。该电池具体可以包括锂离子电池，但不局限于此。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 pole piece, The separator and the second electrode sheet are stacked in sequence and then rolled; the laminated battery core 2 is specifically formed by the first electrode sheet, the separator, and the second electrode sheet being stacked in sequence. The battery may specifically include a lithium-ion battery, but is not limited thereto.
具体地，壳体1可以包括第一侧板11、第二侧板12、第三侧板13、第四侧板14、第五侧板15、第六侧板16，第一侧板11、第四侧板14、第五侧板15、第六侧板16依次相接，并均分别位于第二侧板12(或称底板)和第三侧板13(或称盖板)之间，由此围设成密闭腔体，电芯2置于该腔体内。第一侧板11与第五侧板15位于第四侧板14(或第六侧板16)的相对两侧，第四侧板14与第六侧板16位于第一侧板11(或第五侧板15)的相对两侧，第三侧板13和第二侧板12分别位于第一侧板11(或第四侧板14、或第五侧板15、或第六侧板16)的相对两侧。第三侧板13至第二侧板12的方向为壳体1的厚度方向，第一侧板11至第五侧板15的方向可以为壳体1的长度方向，而第四侧板14至第六侧板16的方向为壳体1的宽度方向，或者第一侧板11至第五侧板15的方向为壳体1的宽度方向，而第四侧板14至第六侧板16为壳体1的长度方向。电芯2的第一面和电芯2的第二面中的一者是电芯2面向第三侧板13的一面，另一者是电芯2面向第二侧板12的一面。Specifically, 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, and a sixth side plate 16. The first side plate 11, The fourth side plate 14, the fifth side plate 15, and the sixth side plate 16 are connected in sequence, and are respectively located between the second side plate 12 (or bottom plate) and the third side plate 13 (or cover plate). Thus, a sealed cavity is formed, and the battery core 2 is placed in the cavity. The first side plate 11 and the fifth side plate 15 are located on opposite sides of the fourth side plate 14 (or the sixth side plate 16 ). The fourth side plate 14 and the sixth side plate 16 are located on the first side plate 11 (or the sixth side plate 16 ). On the opposite sides of the five side panels 15), the third side panel 13 and the second side panel 12 are respectively located on the first side panel 11 (or the fourth side panel 14, or the fifth side panel 15, or the sixth side panel 16). opposite sides of. The direction of the third side plate 13 to the second side plate 12 is the thickness direction of the casing 1 , the direction of the first side plate 11 to the fifth side plate 15 can be the length direction of the casing 1 , and the direction of the fourth side plate 14 to The direction of the sixth side plate 16 is the width direction of the casing 1, or the direction of the first to fifth side plates 11 to 15 is the width direction of the casing 1, and the fourth to sixth side plates 14 to 16 are 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 third side plate 13 , and the other is the side of the battery core 2 facing the second side plate 12 .
其中，第一侧板11和第四侧板14之间、第四侧板14与第五侧板15之间、第五侧板15与第六侧板16之间可以通过圆弧过渡部17连接，即相邻的 两个侧板的连接部位通过圆弧过渡。具体地，该圆弧过渡部17垂直于第一方向的横截面背离腔体的一边和面向腔体的一边均分别为弧线，其形成开口朝向腔体的凹槽，该第一方向平行于从第三侧板13至第二侧板12的方向(即壳体1的厚度方向)。Among them, arc transition portions 17 can be passed between the first side plate 11 and the fourth side plate 14 , between the fourth side plate 14 and the fifth side plate 15 , and between the fifth side plate 15 and the sixth side plate 16 . connected, i.e. adjacent The connection between the two side panels is transitioned through an arc. Specifically, 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 third side plate 13 to the second side plate 12 (that is, the thickness direction of the housing 1).
壳体1上还可以设有减薄部131，减薄部131的机械强度小于壳体1除减薄部131外的其他部分的机械强度，由此，当电池内部压力过大时，可以优先通过减薄部131泄压，以避免电池爆炸等现象的发生。具体地，可以在第三侧板13上设置减薄部131。具体地，减薄部131的厚度小于壳体1上除减薄部131外的其他部分的厚度。The case 1 can also be provided with a thinned portion 131. The mechanical strength of the thinned portion 131 is smaller than the mechanical strength of other parts of the case 1 except the thinned portion 131. Therefore, when the internal pressure of the battery is too high, priority can be given to The pressure is released through the thinned portion 131 to avoid battery explosion and other phenomena. Specifically, a thinned portion 131 may be provided on the third side plate 13 . Specifically, the thickness of the thinned portion 131 is smaller than the thickness of other portions of the housing 1 except the thinned portion 131 .
此外，壳体1上还设有注液孔100、以及用于密封注液孔100的密封片，注液孔100用于向腔体中注入电解液，注入电解液后，用密封片对注液孔100进行密封，该密封片可以包括金属片，其可以与注液孔100周边的壳体1焊接，以对注液孔100进行密封。In addition, the housing 1 is also provided with a liquid injection hole 100 and a sealing sheet for sealing the liquid injection hole 100. The liquid injection hole 100 is used 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 may include a metal sheet, which may be welded to the housing 1 around the liquid injection hole 100 to seal the liquid injection hole 100 .
具体地，注液孔100可以设置在第一侧板11上，具体可以位于第一侧板11与第二导接件3’的相接部位(或第一外接片41)和第一侧板11与第一导接件的相接部位(或第二外接片41’)之间，密封片可以与第一侧板11背离腔体的一侧焊接，具体可以焊接在第一侧板11位于注液孔100周边的部分，以对注液孔100进行密封。Specifically, the liquid injection hole 100 can be provided on the first side plate 11, specifically, it can be located at the joint between the first side plate 11 and the second guide member 3' (or the first external piece 41) and the first side plate. Between the connecting portion of 11 and the first guide piece (or the second external piece 41'), the sealing piece can be welded to the side of the first side plate 11 away from the cavity. Specifically, it can be welded to the position where the first side plate 11 is located. The portion around the liquid injection hole 100 is used to seal the liquid injection hole 100 .
此外，如上所述的焊接具体可以是激光焊接。In addition, the welding as described above may specifically be laser welding.
壳体1具体可以是金属包装壳，即其可以是金属材质，意即第一侧板11、第二侧板12、第三侧板13、第四侧板14、第五侧板15、第六侧板16可以是金属材质，例如铝、铝合金、镍、铁或镍铁合金等。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.
一般情况下，当壳体1与正极耳电连接时，壳体1可以是与正极耳同极性的材质，例如分别为铝或铝合金，二者的具体材质种类可以相同或不同(二者材质不同时，例如正极耳的材质是铝，而壳体1的材质是铝合金)；当壳体1与负极耳电连接时，壳体1与负极耳是同极性材质，例如分别为镍、铁或镍铁合金，二者的具体材质种类可以相同或不同。Generally, 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). When 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.
此外，第一导接件的材质、第一极耳21的材质可以是同极性材质，例如，第一极耳21为正极耳，第一导接件的材质、第一极耳21的材质分别可以为铝或铝合金，其具体材质种类可以相同或不同。第二导接件3’的材质、第二 极耳22的材质可以是同极性材质，例如，第二极耳22为负极耳，第二导接件3’的材质、第二极耳22的材质分别可以为镍、铁或镍铁合金，其具体材质种类可以相同或不同。In addition, the material of the first conductive member and the material of the first tab 21 can be materials of the same polarity. For example, the first tab 21 is a positive tab, and the material of the first conductor and the material of the first tab 21 They can be aluminum or aluminum alloy respectively, and their specific material types can be the same or different. The material of the second guide member 3', the second The material of the pole tab 22 can be a material of the same polarity. For example, the second pole tab 22 is a negative pole tab. The materials of the second conductive member 3' and the second pole tab 22 can be nickel, iron or nickel-iron alloy respectively. The specific material types can be the same or different.
以上对本发明的实施方式进行了说明。但是，本发明不限定于上述实施方式。凡在本发明的精神和原则之内，所做的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。 The embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiment. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims (36)

  1. 一种电池，其特征在于，包括：A battery, characterized by including:
    壳体，围设成腔体；所述壳体包括第一侧板；The shell is surrounded by a cavity; the shell includes a first side plate;
    电芯，位于所述腔体内，所述电芯面向所述第一侧板的一侧设有第一极耳、以及向所述第一侧板延伸的延伸部，所述第一极耳与所述电芯相接的一侧至所述第一侧板的距离大于所述延伸部至所述第一侧板的距离。The battery core is located in the cavity. The side of the battery core facing the first side plate is provided with a first tab and an extension extending toward the first side plate. The first tab is connected to the first side plate. The distance from the side where the battery cores are connected to the first side plate is greater than the distance from the extension part to the first side plate.
  2. 根据权利要求1所述的电池，其特征在于，所述第一极耳在所述第一侧板上的投影与所述延伸部在所述第一侧板上的投影不重叠。The battery according to claim 1, wherein the projection of the first tab on the first side plate does not overlap with the projection of the extension part on the first side plate.
  3. 根据权利要求1所述的电池，其特征在于，所述电池还包括与所述第一侧板相连的第六侧板，所述第一极耳在所述第六侧板上的投影与所述延伸部在所述第六侧板上的投影至少部分重叠。The battery according to claim 1, wherein the battery further includes a sixth side plate connected to the first side plate, and the projection of the first tab on the sixth side plate is consistent with the The projection of the extension portion on the sixth side plate at least partially overlaps.
  4. 根据权利要求1所述的电池，其特征在于，所述电池还包括位于所述腔体内的第一导接件，所述第一导接件与所述第一极耳电连接；所述第一导接件包括第二连接片，所述第一极耳包括与所述第二连接片相接的第二连接部。The battery according to claim 1, wherein the battery further includes a first conductive member located in the cavity, and the first conductive member is electrically connected to the first tab; A conductive member includes a second connecting piece, and the first tab includes a second connecting portion connected to the second connecting piece.
  5. 根据权利要求4所述的电池，其特征在于，所述电芯包括多个层叠设置的极片，所述第一极耳的第二连接部与所述第一导接件的第二连接片相接的一面和所述极片的延伸方向基本平行。The battery according to claim 4, wherein the battery core includes a plurality of stacked pole pieces, and the second connecting portion of the first tab and the second connecting piece of the first conductive member The connecting surface is substantially parallel to the extending direction of the pole piece.
  6. 根据权利要求1所述的电池，其特征在于，所述电池还包括与所述第一极耳电连接的第一导接件，所述第一导接件位于所述腔体内，所述第一导接件包括第二连接片；所述壳体包括与所述第一侧板相连的第二侧板，所述第一极耳包括相连的第一连接部和第二连接部，所述第一连接部与所述电芯连接，其中，The battery according to claim 1, wherein the battery further includes a first conductor electrically connected to the first tab, the first conductor is located in the cavity, and the third conductor is electrically connected to the first tab. A guide piece includes a second connecting piece; the housing includes a second side plate connected to the first side plate; the first tab includes a first connecting part and a second connecting part that are connected; The first connection part is connected to the battery core, wherein,
    所述第二连接部背离所述第二侧板的一侧与所述第二连接片连接；The side of the second connecting portion facing away from the second side plate is connected to the second connecting piece;
    或者，所述第二连接部面向所述第二侧板的一侧与所述第二连接片连接。Alternatively, a side of the second connecting portion facing the second side plate is connected to the second connecting piece.
  7. 根据权利要求4-6任一项所述的电池，其特征在于，所述电芯包括依次层叠设置的第一极片、第二极片以及位于所述第一极片和第二极片之间的隔膜，所述第一极耳设置在所述第一极片上；The battery according to any one of claims 4 to 6, wherein the battery core includes a first pole piece, a second pole piece, and a first pole piece and a second pole piece located between the first pole piece and the second pole piece. a diaphragm between the first pole tab and the first pole piece;
    多个所述第一极耳的第二连接部依次贴合组成第一极耳板，所述第一极耳板与所述第一导接件连接。 The second connecting portions of the plurality of first tabs are sequentially attached to form a first tab plate, and the first tab plate is connected to the first conductive member.
  8. 根据权利要求7所述的电池，其特征在于，所述壳体包括与所述第一侧板相连的第二侧板和第三侧板，所述第二侧板与所述第三侧板相对设置；The battery according to claim 7, wherein the housing includes a second side plate and a third side plate connected to the first side plate, and the second side plate and the third side plate Relative settings;
    所述第一极耳的第二连接部朝向靠近所述第二侧板的方向贴合，形成所述第一极耳板，或者，The second connecting portion of the first tab is attached in a direction close to the second side plate to form the first tab plate, or,
    所述第一极耳的第二连接部朝向靠近所述第三侧板的方向贴合，形成所述第一极耳板，或者，The second connecting portion of the first tab is attached in a direction close to the third side plate to form the first tab plate, or,
    所述第一极耳的第二连接部朝向所述电芯的厚度方向上的中心线贴合，形成所述第一极耳板。The second connecting portion of the first tab is bonded toward the centerline in the thickness direction of the battery core to form the first tab plate.
  9. 根据权利要求7所述的电池，其特征在于，沿所述电芯至所述第一侧板的方向，所述第一极耳板至所述第一侧板的距离大于或等于所述延伸部至所述第一侧板的距离。The battery according to claim 7, wherein along the direction from the battery core to the first side plate, the distance from the first tab plate to the first side plate is greater than or equal to the extension. distance from the bottom to the first side plate.
  10. 根据权利要求6所述的电池，其特征在于，The battery according to claim 6, characterized in that:
    所述第一导接件还包括与所述第二连接片相连的第一连接片，所述第一连接片位于所述第一侧板与所述第一极耳的第一连接部之间；和/或，The first connecting piece also includes a first connecting piece connected to the second connecting piece, and the first connecting piece is located between the first side plate and the first connecting portion of the first tab. ;and / or,
    所述第二连接片位于所述第二侧板与所述第一极耳的第二连接部之间；和/或，The second connecting piece is located between the second side plate and the second connecting portion of the first tab; and/or,
    所述第一连接部与所述电芯相接的一面和所述第二连接部与所述第二连接片相接的一面之间形成有第一夹角，所述第一夹角的范围为80-120°。A first included angle is formed between the surface of the first connecting portion that is connected to the battery core and the surface that is connected to the second connecting portion and the second connecting piece. The range of the first included angle is 80-120°.
  11. 根据权利要求10所述的电池，其特征在于，The battery according to claim 10, characterized in that:
    所述第一连接片所在平面和所述第二连接片所在平面之间形成有第二夹角，所述第二夹角的范围为80-120°。A second included angle is formed between the plane where the first connecting piece is located and the plane where the second connecting piece is located, and the range of the second included angle is 80-120°.
  12. 根据权利要求6所述的电池，其特征在于，所述第一极耳的第二连接部至所述第二侧板的距离大于或等于所述电芯至所述第二侧板的距离。The battery according to claim 6, wherein a distance from the second connecting portion of the first tab to the second side plate is greater than or equal to a distance from the battery core to the second side plate.
  13. 根据权利要求1-6任一项所述的电池，其特征在于，所述电池还包括与所述第一极耳电连接的第一导接件，所述第一导接件位于所述腔体内；所述壳体还包括第二侧板，所述第一导接件在第二侧板上的投影与所述延伸部在所述第二侧板上的投影不重叠。The battery according to any one of claims 1 to 6, characterized in that the battery further includes a first conductor electrically connected to the first tab, and the first conductor is located in the cavity. In the body; the housing further includes a second side plate, the projection of the first guide member on the second side plate does not overlap with the projection of the extension portion on the second side plate.
  14. 根据权利要求1-6任一项所述的电池，其特征在于，The battery according to any one of claims 1-6, characterized in that,
    所述电池还包括与所述第一极耳电连接的第一导接件，所述第一导接件位于所述腔体内，所述第一导接件包括第一连接片； The battery further includes a first conductive member electrically connected to the first tab, the first conductive member is located in the cavity, and the first conductive member includes a first connecting piece;
    所述电池还包括设置在所述第一侧板背离所述腔体的一侧的第一外接片，所述第一外接片包括向外凸起形成的第一极柱，所述第一连接片包括与所述第一极柱对应设置的第一通孔，所述第一极柱穿透所述第一侧板、并通过所述第一通孔与所述第一连接片相接。The battery further includes a first external connection piece disposed on a side of the first side plate facing away from the cavity. The first external connection piece includes a first pole formed by protruding outward. The first connection piece The sheet includes a first through hole corresponding to the first pole, and the first pole penetrates the first side plate and is connected to the first connecting piece through the first through hole.
  15. 根据权利要求14所述的电池，其特征在于，所述第一连接片的第一通孔包括相互连接的第一孔段和第二孔段，所述第二孔段位于所述第一孔段靠近所述电芯的一侧；The battery according to claim 14, wherein the first through hole of the first connecting piece 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. The section is close to the side of the battery core;
    所述第一极柱靠近所述电芯的一端向外延伸形成有与所述第二孔段对应设置的第一外延部。One end of the first pole close to the battery core extends outward to form a first extension portion corresponding to the second hole section.
  16. 根据权利要求14所述的电池，其特征在于，所述第一极柱的靠近电芯的一端面与所述第一连接片的靠近电芯的一侧表面齐平。The battery according to claim 14, wherein an end surface of the first pole close to the battery core is flush with a surface of the first connecting piece close to the battery core.
  17. 根据权利要求14所述的电池，其特征在于，所述第一极柱靠近所述电芯的一端伸出所述第一通孔、并沿所述第一通孔的周向向外延伸形成有与所述第一连接片靠近所述电芯的一侧表面相接的第一外延部。The battery according to claim 14, wherein one end of the first pole close to the battery core protrudes from the first through hole and extends outward along the circumferential direction of the first through hole. There is a first extension portion in contact with a side surface of the first connecting piece close to the battery core.
  18. 根据权利要求14所述的电池，其特征在于，The battery according to claim 14, characterized in that:
    所述第一外接片与所述第一侧板之间还设有第一绝缘片，所述第一导接件与所述第一侧板之间还设有第二绝缘片，所述第一极柱穿透所述第一绝缘片和第二绝缘片；和/或，A first insulating piece is also disposed between the first external piece and the first side plate, and a second insulating piece is disposed between the first conductive member and the first side plate. A pole penetrates the first insulating sheet and the second insulating sheet; and/or,
    所述第一极柱与所述第一侧板之间设有第一绝缘层。A first insulation layer is provided between the first pole and the first side plate.
  19. 根据权利要求18所述的电池，其特征在于，所述第一绝缘片在所述第一侧板上的投影覆盖所述第一外接片在所述第一侧板上的投影。The battery according to claim 18, wherein the projection of the first insulating sheet on the first side panel covers the projection of the first external sheet on the first side panel.
  20. 根据权利要求18或19所述的电池，其特征在于，The battery according to claim 18 or 19, characterized in that,
    所述壳体还包括与所述第一侧板相连的第二侧板，所述第二绝缘片包括第一绝缘部和第二绝缘部；所述第一绝缘部位于所述第一侧板与所述第一导接件之间，所述第一极柱穿透所述第一绝缘部；所述第二绝缘部位于所述第二侧板与所述第一导接件之间。The housing also includes a second side plate connected to the first side plate, the second insulating sheet includes a first insulating part and a second insulating part; the first insulating part is located on the first side plate. Between the first pole and the first conductive member, the first pole penetrates the first insulating part; the second insulating part is located between the second side plate and the first conductive member.
  21. 根据权利要求20所述的电池，其特征在于，所述第二绝缘部在第二侧板上的投影覆盖第一导接件在第二侧板上的投影，和/或，The battery according to claim 20, wherein the projection of the second insulating part on the second side plate covers the projection of the first conductive member on the second side plate, and/or,
    所述第一绝缘部在所述第一侧板上的投影覆盖所述第一导接件在所述第一侧板上的投影。 The projection of the first insulating part on the first side plate covers the projection of the first conductive member on the first side plate.
  22. 根据权利要求1所述的电池，其特征在于，The battery according to claim 1, characterized in that:
    所述延伸部的数量为至少两个，所述第一极耳位于两个相邻的所述延伸部之间；和/或，The number of the extension parts is at least two, and the first tab is located between two adjacent extension parts; and/or,
    所述延伸部在所述电芯厚度方向上的长度等于所述电芯的厚度。The length of the extension portion in the thickness direction of the battery core is equal to the thickness of the battery core.
  23. 根据权利要求1所述的电池，其特征在于，所述电芯面向所述第一侧板的一侧还设有第二极耳，所述第二极耳与所述第一极耳极性相反。The battery according to claim 1, wherein the side of the battery core facing the first side plate is further provided with a second tab, and the polarity of the second tab is the same as that of the first tab. on the contrary.
  24. 根据权利要求23所述的电池，其特征在于，The battery according to claim 23, characterized in that:
    所述第二极耳与所述电芯相接的一侧至所述第一侧板的距离大于所述延伸部至所述第一侧板的距离；和/或，The distance from the side where the second tab is connected to the battery core to the first side plate is greater than the distance from the extension part to the first side plate; and/or,
    所述电池还包括与所述第二极耳电连接的第二导接件，所述第二导接件位于所述腔体内；所述第二导接件包括第三连接片和第四连接片，所述第三连接片位于所述第一侧板与所述第二极耳之间，所述第二极耳包括与所述第四连接片相接的第四连接部；和/或，The battery further includes a second conductor electrically connected to the second tab, the second conductor is located in the cavity; the second conductor includes a third connecting piece and a fourth connection. piece, the third connecting piece is located between the first side plate and the second tab, the second tab includes a fourth connecting portion connected to the fourth connecting piece; and/or ,
    所述电池还包括与所述第二极耳电连接的第二导接件，所述第二导接件位于所述腔体内；所述第二导接件包括第四连接片，所述第二极耳包括与所述第四连接片相接的第四连接部；所述电芯包括多个层叠设置的极片，所述第二极耳的第四连接部与所述第二导接件的第四连接片相接的一面和所述极片的延伸方向基本平行。The battery further includes a second conductive member electrically connected to the second tab, and the second conductive member is located in the cavity; the second conductive member includes a fourth connecting piece, and the third The two pole tabs include a fourth connecting portion connected to the fourth connecting piece; the battery core includes a plurality of stacked pole pieces, and the fourth connecting portion of the second pole tab is connected to the second conductor The connecting surface of the fourth connecting piece of the component is substantially parallel to the extending direction of the pole piece.
  25. 根据权利要求23所述的电池，其特征在于，The battery according to claim 23, characterized in that:
    所述第二极耳与所述第一极耳之间存在所述延伸部；和/或，The extension portion exists between the second pole and the first pole; and/or,
    所述延伸部的数量为至少两个，所述第二极耳位于两个相邻的所述延伸部之间；和/或，The number of the extension parts is at least two, and the second tab is located between two adjacent extension parts; and/or,
    所述第二极耳在所述第一侧板上的投影与所述延伸部在所述第一侧板上的投影不重叠；和/或，The projection of the second tab on the first side plate does not overlap with the projection of the extension part on the first side plate; and/or,
    所述第二极耳在所述第一侧板上的投影与所述第一极耳在所述第一侧板上的投影不重叠；和/或，The projection of the second pole on the first side plate does not overlap with the projection of the first pole on the first side plate; and/or,
    所述壳体还包括与所述第一侧板相连的第六侧板，所述第二极耳在所述第六侧板上的投影与所述延伸部在所述第六侧板上的投影至少部分重叠；和/或，The housing further includes a sixth side plate connected to the first side plate, and the projection of the second tab on the sixth side plate is the same as the projection of the extension part on the sixth side plate. The projections are at least partially overlapping; and/or,
    所述壳体还包括与所述第一侧板相连的第六侧板，所述第二极耳在所述 第六侧板上的投影与所述第一极耳在所述第六侧板上的投影至少部分重叠。The housing also includes a sixth side plate connected to the first side plate, and the second tab is on the The projection on the sixth side plate at least partially overlaps with the projection of the first tab on the sixth side plate.
  26. 根据权利要求1所述的电池，其特征在于，所述电池还包括缓冲片，所述缓冲片位于所述延伸部与所述第一侧板之间。The battery according to claim 1, wherein the battery further includes a buffer piece located between the extension part and the first side plate.
  27. 根据权利要求10所述的电池，其特征在于，所述电池还包括缓冲片，所述缓冲片包括相连的第一缓冲部和第二缓冲部，所述第一缓冲部位于所述延伸部与所述第一侧板之间，所述第二缓冲部位于所述第一极耳的第一连接部与所述第一导接件的第一连接片之间。The battery according to claim 10, characterized in that the battery further includes a buffer piece, the buffer piece includes a connected first buffer part and a second buffer part, the first buffer part is located between the extension part and Between the first side plates, the second buffer portion is located between the first connecting portion of the first tab and the first connecting piece of the first conductive member.
  28. 根据权利要求27所述的电池，其特征在于，The battery according to claim 27, characterized in that:
    所述第一缓冲部的宽度大于或等于所述第二缓冲部的宽度；和/或，The width of the first buffer portion is greater than or equal to the width of the second buffer portion; and/or,
    所述第二缓冲部设有第一凹槽，所述第一极耳的第二连接部延伸至所述第一凹槽内。The second buffer portion is provided with a first groove, and the second connecting portion of the first tab extends into the first groove.
  29. 根据权利要求28所述的电池，其特征在于，所述第二缓冲部在所述电芯的厚度方向上的投影与所述第一极耳的第二连接部以及所述第一导接件在所述电芯的厚度方向上的投影部分重叠；和/或，The battery according to claim 28, wherein the projection of the second buffer portion in the thickness direction of the battery core is in contact with the second connecting portion of the first tab and the first conductive member. The projections in the thickness direction of the battery core partially overlap; and/or,
    所述第一凹槽的在所述电芯的宽度方向上的长度大于或等于所述第一极耳的第二连接部在所述电芯的宽度方向上的长度；和/或，The length of the first groove in the width direction of the battery core is greater than or equal to the length of the second connecting portion of the first tab in the width direction of the battery core; and/or,
    所述第一凹槽的在所述电芯的厚度方向上的长度大于或等于所述第一极耳的第二连接部在所述电芯的厚度方向上的长度；和/或，The length of the first groove in the thickness direction of the battery core is greater than or equal to the length of the second connecting portion of the first tab in the thickness direction of the battery core; and/or,
    沿所述电芯的长度方向，所述第一极耳的第二连接部的端部延伸出所述第一凹槽。Along the length direction of the battery core, the end of the second connecting portion of the first tab extends out of the first groove.
  30. 根据权利要求26-29任一项所述的电池，其特征在于，所述电芯的宽度为a，所述缓冲片在所述电芯的宽度方向上的长度为b，0≤|a-b|≤3。The battery according to any one of claims 26 to 29, characterized in that the width of the battery core is a, the length of the buffer sheet in the width direction of the battery core is b, 0≤|a-b| ≤3.
  31. 根据权利要求1所述的电池，其特征在于，所述电芯具有相对设置的第一面和第二面，以及位于所述第一面和第二面之间的侧面，在所述电芯的至少一侧的侧面的至少部分区域设有第一保护胶层。The battery according to claim 1, characterized in that the battery core has a first surface and a second surface arranged oppositely, and a side surface located between the first surface and the second surface, and the battery core At least part of the side of at least one side is provided with a first protective glue layer.
  32. 根据权利要求31所述的电池，其特征在于，所述电芯包括多个层叠设置的极片，所述电芯的侧面的第一保护胶层延伸至所述电芯的第一面并与位于所述电芯的第一面的极片粘结和/或延伸至所述电芯的第二面并与位于所述电芯的第二面的极片粘接。The battery according to claim 31, wherein the battery core includes a plurality of stacked pole pieces, and the first protective glue layer on the side of the battery core extends to the first surface of the battery core and is in contact with the first surface of the battery core. The pole piece located on the first side of the battery core is bonded and/or extended to the second side of the battery core and bonded with the pole piece located on the second side of the battery core.
  33. 根据权利要求31或32所述的电池，其特征在于，所述第一保护胶 层的数量为多个，多个所述第一保护胶层间隔设置在所述电芯的侧面。The battery according to claim 31 or 32, characterized in that the first protective glue The number of layers is multiple, and a plurality of first protective adhesive layers are arranged at intervals on the side of the battery core.
  34. 根据权利要求1所述的电池，其特征在于，所述延伸部具有相对的第一面和第二面，所述延伸部的第一面和/或所述延伸部的第二面设有第二保护胶层。The battery according to claim 1, wherein the extension part has an opposite first surface and a second surface, and the first surface of the extension part and/or the second surface of the extension part is provided with a third surface. Two protective adhesive layers.
  35. 根据权利要求34所述的电池，其特征在于，所述延伸部的第一面至所述延伸部的第二面的方向垂直于从所述第一极耳至所述延伸部的方向。The battery according to claim 34, wherein the direction from the first surface of the extension part to the second surface of the extension part is perpendicular to the direction from the first tab to the extension part.
  36. 根据权利要求1所述的电池，其特征在于，The battery according to claim 1, characterized in that:
    所述第一极耳为正极耳或负极耳；和/或，The first pole is a positive pole or a negative pole; and/or,
    所述电芯包括叠片式电芯或卷绕式电芯。 The battery core includes a laminated battery core or a wound battery core.
PCT/CN2023/075839 2022-03-26 2023-02-14 Battery WO2023185279A1 (en)

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