WO2023231680A1 - 电池 - Google Patents

电池 Download PDF

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Publication number
WO2023231680A1
WO2023231680A1 PCT/CN2023/091776 CN2023091776W WO2023231680A1 WO 2023231680 A1 WO2023231680 A1 WO 2023231680A1 CN 2023091776 W CN2023091776 W CN 2023091776W WO 2023231680 A1 WO2023231680 A1 WO 2023231680A1
Authority
WO
WIPO (PCT)
Prior art keywords
side plate
adapter
hole
battery
battery according
Prior art date
Application number
PCT/CN2023/091776
Other languages
English (en)
French (fr)
Inventor
卫志达
谢继春
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 WO2023231680A1 publication Critical patent/WO2023231680A1/zh

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
    • H01M50/627—Filling ports
    • H01M50/636—Closing or sealing filling ports, e.g. using lids
    • 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
    • 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 a battery and belongs to the field of electrochemical energy storage devices.
  • 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 sealing and safety are becoming higher and higher.
  • the manufacturing process of the battery it usually involves at least two liquid injection (injection of electrolyte)-formation processes. After one liquid injection, the liquid injection hole needs to be blocked with rubber plugs and other components to prevent the battery from transferring or forming.
  • the electrolyte overflows or water vapor enters during the process.
  • rubber plugs and other components to block the liquid injection hole will, on the one hand, increase the manufacturing process and cost.
  • its sealing effect on the liquid injection hole is not ideal, affecting the performance of the battery product.
  • the invention provides a battery that can improve the sealing and safety performance of the battery, improve the manufacturing yield of the battery, and reduce the battery cost.
  • the present invention provides a battery, which includes: a casing, which is surrounded by a cavity; the casing is provided with a first through hole connected with the cavity; and a sealing member is provided in the cavity for use in nature. When in the state, the first through hole is sealed, and when in the stressed state, it is away from the first through hole.
  • the battery further includes an electric core located in the cavity, and the distance between the seal and the electric core is greater than 0.
  • the battery further includes an electric core located in the cavity, and a second insulating layer is provided between the seal and the electric core.
  • the housing includes a first side plate, and the first through hole is provided in the first side plate;
  • the sealing member includes a connecting portion connected to the first side plate, and a connecting portion connected to the first side plate. The sealing part of the connection part.
  • connection part includes a first connection area connected to the sealing part, and a first connection area located at the There are third connection areas on opposite sides of the first connection area, and the third connection area is connected to the first side plate.
  • the side where the connecting part is connected to the first side plate is parallel to the side where the connecting part is connected to the sealing part.
  • the connecting portion is welded to the first side plate; or the connecting portion and the first side plate are connected through a gasket.
  • the battery further includes a first adapter provided between the first side plate and the seal, and the first adapter is provided with a third adapter connected to the first through hole. Two through holes, the connecting part is connected to the first adapter.
  • a first groove connected to the second through hole is provided on a side of the first adapter member away from the first side plate, and the sealing member is provided in the first groove.
  • the battery further includes an electric core located in the cavity, the electric core is provided with a first tab, and the first adapter is electrically connected to the first tab.
  • the battery further includes a first connector located in the cavity, and the first connector is connected to the first tab and the first adapter respectively.
  • the first adapter includes a connected first adapter part and a second adapter part, and the second through hole is provided in the first adapter part, wherein the first connector Connected to the second adapter portion; and/or, the first adapter portion is connected to the first side plate and the connecting portion respectively.
  • the direction from the first connection area to the third connection area is parallel to the length direction of the first side plate.
  • the connecting portion has an arc-shaped structure; or, the connecting portion further includes a second connecting area connecting the first connecting area and the third connecting area, wherein, in the natural state, The surfaces of the first connection area, the second connection area, and the third connection area are flush; or the second connection area includes at least one arc segment, or the second connection area includes at least Two connecting sections, where an included angle is formed between each two adjacent connecting sections.
  • the second connection area includes an arc segment, and the concave surface of the arc segment is the side facing the first side plate; or, the second connection area includes at least two arc segments, The concave surface of one of the two adjacent arc segments and the concave surface of the other are respectively located on opposite sides of the second connection area.
  • the distribution direction of the at least two arc segments is parallel to the direction along the first side plate to the The direction of the seal; or, the distribution direction of the at least two arc segments is perpendicular to the direction along the first side plate to the seal.
  • the distribution direction of the at least two connecting segments is parallel to the direction along the first side plate to the seal; or, the distribution direction of the at least two connecting segments is perpendicular to the direction along the first side plate. side plate to the direction of the seal.
  • the projection of the sealing portion on the first side plate covers the first through hole.
  • a projection of the sealing portion on the first side plate covers the second through hole.
  • a surface of the sealing portion facing the first through hole is a flat surface or a curved surface.
  • the sealing part is polygonal, cylindrical, hemispherical or spherical.
  • the sealing portion extends at least partially into the first through hole.
  • the sealing portion extends at least partially into the second through hole.
  • sealing part and the connecting part are integrally formed; or, the sealing part and the connecting part are bonded.
  • a second groove is provided on a side of the connecting portion facing the sealing portion, and the sealing portion is partially embedded in the second groove.
  • the sealing part is made of metal or non-metal material; and/or the connecting part is made of metal or non-metal material.
  • the sealing part is made of flexible material.
  • the sealing part is made of rubber or plastic.
  • the plastic material is PET plastic material.
  • the battery further includes a battery core located in the cavity, and the battery core is provided with a second tab; the battery further includes an adapter component, and the adapter component includes a battery core located in the cavity. a second adapter, and an external connecting piece located on the side of the first side plate away from the cavity.
  • the external connecting piece includes an outwardly protruding pole, and the pole penetrates the first side.
  • the board is connected to the second adapter and the second tab.
  • the distance from the seal to the battery core is no greater than the distance from the adapter component to the battery core.
  • the battery further includes a sealing piece for sealing the first through hole, and the sealing piece is located on a side of the housing facing away from the cavity.
  • a sealing member is provided in the cavity.
  • the sealing member has elasticity and is tightly sealed in its natural state. Seal the first through hole and stay away from the first through hole when under stress. Therefore, on the one hand, during the manufacturing process of the battery, when electrolyte needs to be injected multiple times, the seal will automatically reset after each injection of electrolyte. , sealing the first through hole to avoid electrolyte spillage or water vapor entering the cavity during battery transfer or formation, thereby improving the performance of the battery product, facilitating battery production, improving production yield, and simplifying the production process. Reduce costs; on the other hand, in battery products, the sealing member is in a natural state, and the sealing of the first through hole by the sealing member can improve the sealing performance of the battery.
  • Figure 1 is a schematic structural diagram of a seal and a housing in a natural state according to an embodiment of the present invention
  • Figure 2 is a schematic structural diagram of the seal and the housing in a natural state according to an embodiment of the present invention
  • Figure 3 is a schematic structural diagram of the seal and the housing in a natural state according to an embodiment of the present invention
  • Figure 4 is a schematic structural diagram of the seal and the housing in a natural state according to an embodiment of the present invention.
  • Figure 5 is a schematic structural diagram of the seal and the housing in a stressed state according to an embodiment of the present invention.
  • Figure 6 is a schematic structural diagram of the seal and the housing in a natural state according to an embodiment of the present invention.
  • Figure 7 is a schematic structural diagram of the seal and the housing in a natural state according to an embodiment of the present invention.
  • Figure 8 is a schematic structural diagram of a seal according to an embodiment of the present invention.
  • Figure 9 is a schematic structural diagram of a seal according to another embodiment of the present invention.
  • Figure 10 is a schematic structural diagram of a seal according to another embodiment of the present invention.
  • Figure 11 is a schematic structural diagram of a battery according to an embodiment of the present invention.
  • the terms “setting”, “installation”, “connection” and “connecting” should be understood in a broad sense.
  • it can be a fixed connection or a detachable connection. , or it can be an integrated connection; it can be a mechanical connection, an electrical connection, or a communication connection (network connection); it can be a direct connection, or an indirect connection through an intermediate medium, 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.
  • the sealing, stability and safety of batteries are important factors affecting the promotion and application of batteries. Therefore, it is urgent to improve the sealing, stability and safety of batteries.
  • the battery manufacturing process usually involves at least two liquid injection (injection of electrolyte)-formation processes. After one liquid injection, the liquid injection hole needs to be blocked with rubber plugs and other components to prevent the battery from transferring. Or the electrolyte overflows or water vapor enters during the formation process.
  • using rubber plugs and other components to block the liquid injection hole will, on the one hand, increase the manufacturing process and cost.
  • its sealing effect on the liquid injection hole is not ideal, affecting the performance of the battery product.
  • An embodiment of the present invention provides a battery, as shown in Figures 1 to 11.
  • the battery includes: a housing 1, which is surrounded by a cavity; the housing 1 is provided with a first through hole 10 communicating with the cavity; and a sealing member 9. It is provided in the cavity and is used to seal the first through hole 10 in the natural state and stay away from the first through hole 10 in the stressed state.
  • the natural state is the natural state after the seal is connected to the housing and other components, that is, the seal is not stressed.
  • the first through hole 10 can be used as an injection hole for injecting electrolyte into the cavity.
  • electrolyte When electrolyte is injected When the liquid is in the liquid, the electrolyte generates pressure on the sealing member 9 and pushes the sealing member 9 away. Even if the sealing member 9 is in a stressed state, it is away from the first through hole 10 and forms a first through hole communicating with the first through hole 10. 10 and the channel/gap of the cavity to allow the electrolyte to be injected into the cavity; when the electrolyte injection is completed, the seal The sealing member 9 automatically resets, returns to its natural state, and seals the first through hole 10 .
  • the seal 9 automatically resets after each injection of the electrolyte to seal the first through hole 10 to avoid electrolysis during battery transfer or formation. Liquid overflow or water vapor entering the cavity will facilitate battery production, improve production yield, simplify the production process, reduce costs, and at the same time optimize the performance of battery products.
  • the sealing member 9 is in a natural state, and by sealing the first through hole 10 with the sealing member 9 , the sealing performance of the battery can be improved.
  • 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.
  • Board 16 the first side panel 11, the second side panel 12, the third side panel 13, and the fourth side panel 14 are connected in sequence, and are located at the sixth side panel 16 (or bottom panel) and the fifth side panel 15 respectively. (or cover), thus forming a closed cavity.
  • the first side panel 11 and the third side panel 13 are located on opposite sides of the second side panel 12 (or the fourth side panel 14 ).
  • the second side panel 12 and the fourth side panel 14 are located on the first side panel 11 (or the fourth side panel 14 ).
  • the fifth side panel 15 and the sixth side panel 16 are respectively located on the first side panel 11 (or the second side panel 12, or the third side panel 13, or the fourth side panel 14). opposite sides of.
  • the direction of the fifth side plate 15 to the sixth side plate 16 is the thickness direction of the casing 1
  • the direction of the first side plate 11 to the third side plate 13 can be the length direction of the casing 1
  • the direction of the second side plate 12 to the third side plate 12 can be the length direction of the casing 1 .
  • the direction of the four side plates 14 is the width direction of the casing 1, or the direction of the first side plate 11 to the third side plate 13 is the width direction of the casing 1, and the direction of the second side plate 12 to the fourth side plate 14 is the width direction of the casing 1.
  • the first through hole 10 may be specifically provided on the first side plate 11 .
  • the first side plate 11 and the second side plate 12, the second side plate 12 and the third side plate 13, and the third side plate 13 and the fourth side plate 14 can be connected through arc transition portions 17. That is, the connecting portion of two adjacent side plates is transitioned through an arc, and the concave surface of the arc transition portion 17 is the surface facing the cavity.
  • the housing 1 can also be provided with a thinned portion 151.
  • the thinned portion 151 can be provided on the fifth side plate 15.
  • the mechanical strength of the thinned portion 151 is smaller than that of the housing 1 except for the thinned portion 151.
  • the mechanical strength of other parts except the thinned part 151 for example, the thickness of the thinned part 151 is smaller than the thickness of other parts of the casing 1 except the thinned part 151. Therefore, when the internal pressure of the battery is too high, the thinned part 151 can be passed through first. Relieve pressure to avoid battery explosion and other phenomena.
  • the battery also includes a battery core 2 located in the cavity.
  • the battery core 2 includes a first tab 21 and a second tab 22.
  • the polarities of the first tab 21 and the second tab 22 can be opposite.
  • the first pole The ear 21 is a positive electrode tab
  • the second electrode tab 22 is a negative electrode tab.
  • the first electrode tab 21 is a negative electrode tab
  • the second electrode tab 22 is a positive electrode tab.
  • the battery core 2 includes a plurality of stacked electrode sheets.
  • the electrode sheets include a first electrode sheet and a second electrode sheet with opposite polarity to the first electrode sheet.
  • the two electrode sheets are separated by a separator.
  • the first electrode sheet may be a positive electrode sheet or a negative electrode sheet, and accordingly, the second electrode sheet may be a negative electrode sheet or a positive electrode sheet.
  • the first electrode sheet includes a first current collector, the first tab 21 is disposed on the first current collector, the second electrode sheet includes a second current collector, and the second tab 22 is disposed on the second current collector.
  • the first tab 21 and the second tab 22 are provided on the side of the battery core 2 facing the first side plate 11.
  • the end surface of the side of the battery core 2 facing the first side plate is in contact with the thickness direction of the battery core 2/first electrode.
  • the thickness direction of the sheet/the thickness direction of the second electrode sheet are parallel, that is, the tab (first tab 21/second tab 22) is arranged at the end of the current collector (first current collector/second current collector), and the electrode
  • the end surface of the side of the core 2 facing the first side plate 11 is composed of a plurality of stacked electrode sheets (first electrode sheet/second electrode sheet) and the end surface of the side with tabs (the electrode sheets are parallel to the thickness direction thereof) end face) is formed.
  • the battery core 2 may include a laminated battery core 2 and/or a wound battery core 2.
  • the wound battery core 2 is formed by stacking a plurality of electrode sheets and then rolling them. Specifically, it is composed of a first electrode sheet, The separator and the second electrode sheet are stacked in sequence and then rolled; the laminated battery core 2 is specifically formed by the first electrode sheet, the separator, and the second electrode sheet being stacked in sequence.
  • 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 electrode The sheets are stacked along the thickness direction of the battery core 2, that is, the thickness direction of the battery core 2 is also the thickness direction of the electrode sheets; the direction from the first side plate 11 to the battery core 2 can be parallel to the length direction of the housing 1, and the first side
  • the surface of the plate 11 and the surface of the second side plate 12 may be perpendicular to the surface of the electrode sheet.
  • the sealing member 9 has elasticity and can elastically deform under different stress states to approach and seal the first through hole 10 or to move away from the first through hole 10 .
  • the sealing member 9 may include a connecting portion connected to the first side plate 11 and a sealing portion connected to the connecting portion.
  • the sealing portion seals the first through hole 10 or is away from the first through hole 10 to form a communicating first through hole 10 .
  • connection part may be an elastic support part used for elastic deformation to support the sealing part 91 to seal the first through hole 10 or stay away from the first through hole 10 ;
  • the elastic support part/connection part includes The first connection area 921 connected to the sealing part 91 and the two opposite parts located in the first connection area 921 The third connection area 923 is connected to the first side plate 11 .
  • connection part also includes a second connection area connecting the first connection area 921 and the third connection area 923.
  • the second connection area is generally the main functional area that undergoes elastic deformation.
  • connection part in a natural state, the surfaces of the first connection area 921 , the second connection area, and the third connection area 923 are flush, and the connection part may be a straight structure, such as a straight sheet structure.
  • the second connection area includes at least one arc segment 922.
  • the second connection area includes an arc segment 922.
  • the concave surface of the arc segment 922 is the side facing the first side plate 11. In a natural state, it is equivalent to the connection portion in the second
  • the connection area forms a protrusion toward the battery core 2.
  • the second connection area may also be a spring structure.
  • the second connection area includes at least two arc-shaped segments 922, wherein each two adjacent arc-shaped segments The concave surface of one of the arc segments 922 and the concave surface of the other one are respectively located on opposite sides of the second connection area, so that the shape of the two arc-shaped segments 922 after they are connected is an "S" shape.
  • the distribution direction of the above-mentioned at least two arc segments 922 is parallel to the direction along the first side plate 11 to the seal 9 , that is, all arcs of the second connection area.
  • the arc-shaped segments 922 are distributed along the direction from the first side plate 11 to the sealing member 9 .
  • the tangent line of the arc-shaped segment 922 may be perpendicular to the first side plate 11 , for example.
  • the distribution direction of at least two arc segments 922 is perpendicular to the direction along the first side plate 11 to the seal 9 .
  • the tangent line of the arc segment 922 is parallel to the first side plate. 11.
  • all the arc segments 922 of the second connection area may be distributed along the length direction of the first side plate 11 .
  • the above-mentioned arc segment 922 is, for example, a semicircular arc segment, but is not limited thereto.
  • the second connection area includes at least two connection sections, which are straight sections, and an angle is formed between each two adjacent connection sections, thereby making the second connection area have a spring structure.
  • the distribution direction of at least two connecting segments is parallel to the direction along the first side plate 11 to the sealing member 9 , or the distribution direction of the at least two connecting segments is perpendicular to the direction along the first side plate 11 to the sealing member 9 . direction.
  • connection part may also have an arc-shaped structure, that is, after the first connection area 921, the second connection area, and the third connection area 923 are connected in sequence, the overall structure of the connection part formed is an arc shape, and its concave surface faces the first side. On one side of the board 11, this arc-shaped structure can effectively provide its structural strength and prevent it from folding after multiple bends. Break.
  • the side connecting the connecting portion/third connecting area 923 to the first side plate 11 is parallel to the side connecting the first connecting area 921 to the sealing portion 91 .
  • connection part/third connection area 923 is directly connected to the first side plate 11 , such as by welding.
  • the second connection area is generally a bend with a bending structure (such as the above-mentioned arc segment). bend area.
  • the connecting portion/third connecting area 923 and the first side plate 11 can also be connected through a gasket.
  • the second connecting area can be a bending area with a bending structure or a straight structure, such as The whole part is a straight structure.
  • the sealing portion 91 interferes with the first through hole 10 to achieve sealing; wherein, the projection of the sealing portion 91 on the first side plate 11 covers the first through hole 10 , and the sealing portion 91
  • the projected area on the first side plate 11 is larger than the projected area of the first through hole 10 on the first side plate 11 .
  • the sealing portion 91 may not extend into the first through hole 10 , that is, the sealing portion 91 abuts the first side plate 11 , or at least partially extends into the first through hole 10 .
  • the length direction of the seal 9 is parallel to the length direction of the first side plate 11 or the width direction of the first side plate 11 ; the direction along the first connection area 921 to the third connection area 923 may be parallel to the first side plate 11
  • the length direction (as shown in Figures 1 to 7 and 11) can also be parallel to the width direction of the first side plate 11; the direction along the first connection area 921 to the third connection area 923 is preferably parallel to the seal 9 length direction.
  • the battery also includes a first adapter 31 provided between the first side plate 11 and the seal 9.
  • the first adapter 31 can be electrically connected to the first tab 21. The connection is used to draw out the electricity in the battery cell 2 and connect to the peripheral circuit (such as the circuit of the electronic product in which the battery is installed).
  • the projection of the first adapter 31 on the first side plate 11 does not overlap with the projection of the first tab 21 on the first side plate 11 (that is, the first adapter 31 is parallel to the first side plate 11
  • the projection of the extension direction does not overlap with the projection of the extension direction of the first tab 21 parallel to the first side plate 11). Therefore, the first tab 21 and the first adapter 31 do not extend along the battery core 2 to the first side.
  • the distance from the connected side to the side of the first tab 21 away from the battery core 2 (that is, the side facing the first side plate 11) is b 1 , and the first adapter 31 faces the side of the battery core 2 (that is, the side facing the first side plate 11 ).
  • the technical solution of this embodiment can make full use of the space between the battery core and the first side plate, and can save the cavity space, thereby increasing the size of the battery core and improving the energy density of the battery.
  • the projection of the first adapter 31 on the second side plate 12 at least partially overlaps with the projection of the first tab 21 on the second side plate 12 (that is, the first adapter 31 is perpendicular to the first side plate 11
  • the projection of the extension direction at least partially overlaps with the projection of the first tab 21 perpendicular to the extension direction of the first side plate 11 ), that is, the first adapter 31 and the first tab 21 are along the extension direction of the first side plate 11
  • the distribution facilitates the connection between the first tab 21 and the first adapter 31 and further saves the cavity space.
  • the extending direction of the first side plate 11 is parallel to the surface of the first side plate 11 , and the extending direction of the first side plate 11 may be the width direction of the housing 1 or the thickness direction of the housing 1 .
  • the extension direction of the first side plate 11 is the width direction of the housing 1 .
  • the projection of the first adapter 31 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 , that is, the first adapter 31 and The first tabs 21 are distributed along the width direction of the battery core 2 .
  • the first adapter 31 is provided with a second through hole 310 connected to the first through hole 10, and the seal 9 is connected to the first adapter 31, such as by welding or through Gasket connection, in the natural state, the sealing part 91 seals the second through hole 310 to achieve sealing of the first through hole 10, or in the stressed state, it is away from the second through hole 310 to achieve communication with the first through hole 310.
  • the passage between the through hole 10 and the cavity facilitates the injection of electrolyte.
  • the sealing portion 91 interferes with the second through hole to achieve sealing; wherein, the projection of the sealing portion 91 on the first side plate 11 covers the second through hole 310, and the sealing portion 91 is in The projected area of the first side plate 11 is larger than the projected area of the second through hole 310 on the first side plate 11 .
  • the sealing portion 91 does not extend into the second through hole 310 , that is, the sealing portion 91 abuts against the inner wall of the first adapter 31 , or at least partially extends into the second through hole 310 .
  • the first adapter 31 is connected to the first side plate 11 , for example, by welding, and the side where the connection portion/third connection area 923 is connected to the first adapter 31 is parallel to the first adapter 31 and the first side plate. 11 connected side.
  • the side of the first adapter 31 away from the first side plate 11 is provided with a second
  • the through hole 310 communicates with the first groove, and the sealing member 9 is disposed in the first groove.
  • the first adapter 31 includes a second adapter 312, a first adapter 311 and a third adapter 313 that are connected in sequence, and the sealing member 9 is located in the first groove surrounded by the three. .
  • the second through hole 310 is provided in the first adapter part 311, the first side plate 11 is connected to the first adapter part 311, and specifically it can be welded, and the third connection area 923 is connected to the first adapter part 311, specifically it can be Welded or connected via gaskets.
  • an included angle is formed between the first rotating part 311 and the second transferring part 312 / the third transferring part 313 , and the included angle is, for example, not greater than 90° (i.e., the two The angle between surfaces or planes is not greater than 90°).
  • One side of the second adapter part 312 is in contact with one side of the first adapter part 311 , and the other side of the second adapter part 312 is along the thickness direction of the first adapter part 311 (the first adapter part 311 is away from the direction of the first side plate) extends outward, one side of the third adapter portion 313 is connected to the other side of the first adapter portion 311, and the other side of the third adapter portion 313 extends along the first adapter portion
  • the thickness direction of 311 extends outward.
  • the longitudinal direction and length of the first adapter part 311, the second adapter part 312, and the third adapter part 313 can be the same.
  • the lengths of the second adapter part 312 and the third adapter part 313 The width direction and width may be the same, and the width direction is the same as the thickness direction of the first adapter portion 311 .
  • the second through hole 310 may be disposed in the middle of the first adapter part 311 without extending to the second adapter part 312 and the third adapter part 313.
  • the distance from the second through hole 310 to the second adapter part 312 is equal to
  • the distance from the second through hole 310 to the third adapter part may be equal or unequal, preferably equal.
  • the center point of the second through hole 310 is the center point of the first adapter portion 311 .
  • the projection of the first adapter portion 311 perpendicular to the axial direction of the second through hole 310 is a substantially regular quadrilateral.
  • the first adapter portion 311 has an opposite first side and a third side, and an opposite second side. The direction from the first side to the third side and the direction from the second side to the fourth side are all perpendicular to the axial direction of the second through hole 310 , and the direction from the first side to the third side is consistent with the direction of the second side.
  • the directions to the fourth side may be perpendicular to each other, and the distance from the second through hole 310 to the first side of the first adapter part 311 is substantially equal to the distance from the second through hole 310 to the third side of the first adapter part 311.
  • the distance from the second through hole 310 to the second side of the first adapter part 311 is substantially equal to the distance from the second through hole 310 to the fourth side of the first adapter part 311 .
  • the second adapter portion 312 is connected to the first side of the first adapter portion 311
  • the third adapter portion 313 is connected to the third side of the first adapter portion 311 .
  • the second adapter part 312 may be located on a side of the first adapter part 311 facing the fifth side plate 15 .
  • the third adapter portion 313 is located on the side of the first adapter portion 311 facing the sixth side plate 16 .
  • the axial direction of the first through hole 10 is the same as the thickness direction of the first side plate 11
  • the axial direction of the second through hole 310 is the same as the thickness direction of the first adapter portion 311 .
  • the projections of the first through hole 10 and the second through hole 310 on the first side plate 11 at least partially overlap.
  • the radius of the projection of the first through hole 10 on the first side plate 11 is r 1
  • the radius of the projection of the second through hole 310 on the first side plate 11 is r 2
  • the radius of the first through hole 10 is r 1
  • the distance between the projected circle center on the first side plate 11 and the projected circle of the second through hole 310 on the first side plate 11 is L ⁇ r 1 +r 2 .
  • r 1 ⁇ r 2 or r 1 ⁇ r 2 .
  • the projection of the first through hole 10 on the first side plate 11 and the projection of the second through hole 310 on the first side plate 11 may partially overlap or completely overlap.
  • the case of full overlap may specifically include: One of the projection of the hole 10 on the first side plate 11 and the projection of the second through hole 310 on the first side plate 11 covers the other, that is, the projection of the first through hole 10 on the first side plate 11
  • the projection of the second through hole 310 on the first side plate 11 is covered, or the projection of the second through hole 310 on the first side plate 11 covers the projection of the first through hole 10 on the first side plate 11 .
  • the radius (or area) of the projection of the second through hole 310 on the first side plate 11 is larger than the projection of the first through hole 10 on the first side plate 11 , and the first through hole 10 is on the first side.
  • the projection on the plate 11 is located within the projection of the second through hole 310 on the first side plate 11 .
  • the radius (or area) of the projection of the first through hole 10 on the first side plate 11 is larger than the projection of the second through hole 310 on the first side plate 11 , and the second through hole 310 is on the first side plate 11 .
  • the above-mentioned battery may also include a first connector located between the battery core 2 and the first side plate 11.
  • the first connector is connected to the first tab 21 and the first adapter 31 respectively.
  • It can be connected to the second adapter part 312, for example, the second adapter part 312, the first connector, and the first tab 21 are welded in sequence.
  • the first connecting member may include a first connecting piece 51 connected to the first adapter 31/second adapter 312, and a fourth connecting piece 51 connected to the side of the first tab 21 away from the battery core 2. Connecting piece 54.
  • the first connecting piece may have a bending structure.
  • the first connecting piece 51 is connected to the first adapter 31 , specifically, it may be connected to the second adapter part 312 .
  • the fourth connecting piece 54 is connected to the first connecting piece 51 .
  • a first included angle is formed between the side of the first adapter 31 that is connected to the first connecting piece 51 and the side that is connected to the fourth connecting piece 54 and the first tab 21,
  • the first included angle ranges from 80° to 120°, such as 80°, 90°, 100°, 110°, 120°, etc., that is, the side of the first adapter 31 that is connected to the first connecting piece 51 and the fourth connection
  • the surface of the piece 54 that is in contact with the first tab 21 is not parallel, for example, it can be perpendicular. Therefore, the interface between the first adapter 31 and the first connecting piece 51 and the interface between the fourth connecting piece 54 and the first tab 21 are staggered, so that the two interfaces are basically along the direction of the battery core.
  • the arrangement in the width direction can not only reduce the space occupied by the first adapter 31 and the first connecting piece 51 in the cavity, but also improve the connection between the first adapter 31 and the first connecting piece 51 and the fourth connecting piece. 54 and the first tab 21 do not interfere with each other, and can further improve the stability of the connection between the first adapter 31 and the first tab 21 through the first connector, thereby improving the stability, safety and use of the battery. Quality such as longevity.
  • the side of the first adapter 31 that is connected to the first connecting piece 51 and the side of the first adapter 31 that is connected to the first side plate 11 are formed between them, and the range of the second included angle is 80-120°, such as 80°, 90°, 100°, 110°, 120°, that is, the two are not parallel, and may be perpendicular to each other, for example.
  • the side of the first connecting piece 51 that is in contact with the first adapter 31 may be parallel to the surface of the electrode piece.
  • the first connecting piece also includes a first connecting component that is connected to the first connecting piece 51 and the fourth connecting piece 54 respectively.
  • the first connecting component includes a second connecting piece 52 and a third connecting piece 53.
  • the second connecting piece 52 is located between the first adapter 31 and the battery core 2; in the direction from the first adapter 31 to the first tab 21, the third connecting piece 53 is located between the first adapter 31 and the first tab 21.
  • the first connecting piece 51, the second connecting piece 52, the third connecting piece 53, and the fourth connecting piece 54 are connected in sequence.
  • the first connecting piece has a multiple bending structure, and its first connecting piece 51 is connected to the fourth connecting piece 54 through the second connecting piece 52 and the third connecting piece 53 in sequence, and the surface of the first connecting piece 51 is connected to the fourth connecting piece 54 .
  • the surfaces of the two connecting pieces 52 are not parallel, for example, perpendicular.
  • the surfaces of the second connecting piece 52 and the third connecting piece 53 are not parallel, and may be perpendicular or non-perpendicular.
  • the surfaces of the fourth connecting piece 54 and the surfaces of the second connecting piece 52 are not parallel. The surfaces can be parallel.
  • first connecting piece 51 multiple bends of the first connecting piece 51 , the second connecting piece 52 , the third connecting piece 53 and the fourth connecting piece 54 are provided to prevent the first connecting piece from shaking in the left and right and front and rear directions. , the stability of the connection between the first adapter 31 and the first tab 21 can be further improved.
  • the side of the sealing portion 91 facing the first through hole 10 is a flat surface (Fig. 4 or Fig. 7) or a curved surface (Fig. 2 and Fig. 3);
  • sealing part 91 may be polygonal, cylindrical, hemispherical or spherical, wherein the polygonal shape is, for example, a quadrilateral, further a rectangle or a square.
  • the sealing part 91 is made of metal or non-metallic material
  • the connecting part is made of metal or non-metallic material
  • the connecting part is made of metal
  • the sealing part 91 is made of flexible material, such as rubber material or plastic material
  • the plastic material can be PET plastic. Material.
  • sealing part 91 and the connection part may be integrally formed, or the sealing part 91 and the connection part may be bonded.
  • a second groove is provided on the side of the connecting portion facing the sealing portion 91 , and the sealing portion 91 is partially embedded in the second groove.
  • the material of the sealing portion 91 can be injection molded to form a Sealing part 91.
  • the above battery can also include a sealing sheet 101 for sealing the first through hole 10.
  • the sealing sheet 101 is located on the side of the housing 1 away from the cavity. Specifically, it can be located on the side of the first side plate away from the cavity.
  • the sealing sheet 101 can Connected to the first side plate 11 , such as welding, the projection of the sealing sheet 101 on the first side plate 11 covers the first through hole 10 .
  • the distance between the sealing member 9 and the battery core 2 is greater than 0, which avoids short circuits caused by contact between the sealing member 9 and the battery core 2, and improves the stability and safety performance of the battery.
  • a second insulation layer 82 is provided between the seal 9 and the battery core 2 to further improve the stability and safety performance of the battery. As shown in FIG. 11 , the second insulating layer 82 can be located between the first connecting member and the battery core 2 , specifically between the second connecting piece 52 and the battery core 2 .
  • the second insulating layer 82 extends to the first side of the battery core 2 and is bonded to the electrode sheet located on the first side of the battery core 2 .
  • the second insulating layer 82 extends to the first side of the battery core 2 .
  • the second side of the core 2 is bonded to the electrode sheet located on the second side of the battery core 2. In this way, the second insulating layer 82 wraps around the side of the battery core 2 and can also fix the battery core 2 and improve the stability of the battery core 2. sex.
  • the above battery may further include a third insulating layer 83 located between the first connector and the first side plate 11 .
  • the third insulating layer 83 may include a first portion located on a side of the fourth connecting piece 54 facing away from the first tab 21 .
  • the battery core 2 has a first surface and a second surface arranged oppositely, and the third insulating layer 83 further includes a shape extending from an end of the first portion close to the first surface of the battery core 2 to a direction close to the battery core 2 .
  • a second part is formed and a third part is formed extending from an end of the first part close to the second surface of the battery core 2 in a direction close to the battery core 2 .
  • the first surface and the second surface of the battery core are parallel to the surface of the electrode sheet (that is, perpendicular to the thickness direction of the electrode sheet/battery core).
  • the second part, the first part and the third part of the third insulating layer 83 are connected in sequence and surrounded by a third groove.
  • the bottom wall of the third groove is the first part of the third insulating layer 83
  • the side walls are respectively the second part and the third part of the third insulating layer 83
  • the first tab 21, and the part where the first connector is connected to the first tab 21 (such as the fourth connecting piece 54, the first The second connecting portion 512) of the connecting piece 51 located on the side of the first tab 21 is located in the third groove and is covered by the third insulating layer 83, thereby preventing the first tab 21 or the first connecting piece 51 from contacting the housing.
  • the first tab 21 and the first connector are protected, preventing the first tab 21 and the first connector from colliding with the case when the battery is dropped, thereby further improving the stability of the battery. and safety performance.
  • the first tab 21 has an opposite first side and a second side.
  • the first side of the first tab 21 and the second side of the first tab 21 are respectively located between the first tab 21 and the fourth connection.
  • the opposite sides of the side where the sheets 54 are connected that is, the side of the first tab 21 facing away from the battery core 2).
  • the third insulating layer 83 includes a first portion located on the side of the fourth connecting piece 54 facing away from the first tab 21 , a second portion located on the first side of the first tab 21 , and a second portion located on the second side of the first tab 21 . the third part.
  • the projection of the first tab 21 in the thickness direction of the battery core 2 is located within the projection of the second part of the third insulating layer 83 in the thickness direction of the battery core 2 , and the first tab 21 is in the thickness direction of the battery core 2 .
  • the projection in the thickness direction of the core 2 is located within the projection of the third part of the third insulating layer 83 in the thickness direction of the battery core 2 , and the projection of the first tab 21 in the length direction of the battery core 2 is located in the third insulating layer.
  • the first part of 83 is within the projection in the length direction of the battery core 2 , that is, the third insulating layer 83 completely covers the first tab 21 and the part where the first connector is connected to the first tab 21 .
  • the direction from the second part to the first tab 21, the direction from the third part to the first tab 21, the direction from the second part to the third part, and the thickness direction of the battery core 2 can be parallel, and the direction from the first part to the first The direction of the tabs 21 is parallel to the length direction of the battery core 2 .
  • the second part of the third insulating layer 83 extends to the first side of the battery core 2 and is bonded to the electrode sheet located on the first side of the battery core 2 (the electrode sheet close to the housing 1),
  • the third part of the third insulating layer 83 extends to the second surface of the battery core 2 and is bonded to the electrode sheet located on the second surface of the battery core 2 (the electrode sheet close to the housing 1). Therefore, the third insulation layer 83 Layer 83 wraps around the side of cell 2, The stability of the battery core 2 can be further improved.
  • the battery also includes an adapter component electrically connected to the second tab 22.
  • the adapter component may specifically include a second adapter 32 located in the cavity, and an adapter component located on the side of the first side plate 11 away from the cavity.
  • the external connecting piece 41 includes a pole 42 formed by protruding outwards. The pole 42 penetrates the first side plate 11 and is connected to the second adapter 32 and the second pole lug 22 .
  • the distance between the sealing member 9 and the battery core 2 is no greater than (equal to or less than) the distance between the adapter assembly and the battery core 2. This avoids the introduction of the sealing member 9 from occupying additional cavity space, thus improving battery sealing. While ensuring performance and safety, it also takes into account the performance of ensuring and improving the energy density of the battery.
  • the distance between the pole post 42 and the battery core 2 may be greater than, equal to, or smaller than the distance between the second adapter 32 and the battery core 2.
  • the distance between the pole post 42 and the battery core 2 is greater than the distance between the second adapter 32 and the battery core 2
  • the distance between the battery core 2 and the sealing member 9 is no greater than the distance between the pole 42 and the battery core 2; when the distance between the pole 42 and the battery core 2 is smaller than the distance between the second adapter 32 and the battery core 2
  • the distance between the sealing member 9 and the battery core 2 is no longer than the distance between the second adapter 32 and the battery core 2 .
  • the second adapter 32 is disposed between the first side plate 11 and the battery core 2 .
  • the projection of the second adapter 32 on the first side plate 11 is consistent with the projection of the second tab 22 on the first side plate 11 .
  • the projection on does not overlap (that is, the projection of the second adapter 32 parallel to the extension direction of the first side plate 11 does not overlap with the projection of the second tab 22 parallel to the extension direction of the first side plate 11 ).
  • the second tabs 22 and the second adapter 32 are not distributed along the direction from the battery core 2 to the first side plate 11.
  • the third The distance from one side plate 11 to the battery core 2 is a 1 , from the side where the second tab 22 is connected to the battery core 2 to the side of the second tab 22 away from the battery core 2 (that is, facing the first side plate 11
  • the distance between one side) is b 2
  • from the side of the second adapter 32 facing the battery core 2 (that is, the side away from the first side plate 11 ) to the side of the second adapter 32 facing the first side plate 11 (That is, the length of the second adapter 32 in the direction along the first side plate 11 to the battery core 2 ) is c 2 , a 1 ⁇ b 2 + c 2 , thus, the cavity space can be further saved and the battery can be improved. energy density and other properties.
  • b 2 and b 1 may be equal or unequal, and c 2 and c 1 may be equal or unequal.
  • the projections of the first pole tab 21 , the second pole tab 22 , the first adapter 31 , and the second adapter 32 on the first side plate do not overlap with each other.
  • the projection of the second adapter 32 on the second side plate 12 at least partially overlaps the projection of the second tab 22 on the second side plate 12 (that is, the second adapter 32 is perpendicular to the second side plate 12 ).
  • the projection of the extension direction of one side plate 11 and the projection of the second tab 22 are perpendicular to the extension direction of the first side plate 11 at least partially. (overlapping), that is to say, the second adapter 32 and the second tab 22 are arranged along the extension direction of the first side plate, specifically in the width direction of the battery core, thereby facilitating the second adapter.
  • the connection between the connector 32 and the second tab 22 further saves the cavity space and improves the energy density and other performance of the battery.
  • the projection of the first pole 21 on the second side plate 12 at least partially overlaps with the projection of the second pole 22 on the second side plate 12 (that is, the extension of the first pole 21 perpendicular to the first side plate 11
  • the projection of the second tab 22 perpendicular to the extension direction of the first side plate 11 at least partially overlaps).
  • the projection of the first adapter 31 on the second side panel 12 and the projection of the second adapter 32 on the second side panel 12 at least partially overlap.
  • the projection of the first tab 21 perpendicular to the width direction of the battery core 2 at least partially overlaps with the projection of the second tab 22 perpendicular to the width direction of the battery core 2
  • the second adapter 32 The projection perpendicular to the width direction of the battery core 2 at least partially overlaps with the projection of the second tab 22 perpendicular to the width direction of the battery core 2 .
  • first pole tab 21 and the second pole tab 22 may be located between the first adapter part 31 and the second adapter part 32, thereby fully utilizing the space between the first adapter part 31 and the second adapter part 32. space to further expand the size of the electrode sheet of the battery core 2 in the length direction to increase the energy density of the battery core.
  • first tab 21 and the second tab 22 are located between the first adapter 31 and the second adapter 32 , that is, The first adapter 31 , the first tab 21 , the second tab 22 , and the second adapter 32 can be arranged in sequence.
  • first adapter 31 , the first tab 21 , and the second tab 22 can be arranged sequentially in the width direction of the battery core 2, and the first adapter 31, the first tab 21, the second tab 22, and the second adapter 32 can be basically coaxially arranged. .
  • first adapter 31 and the second adapter 32 may be located between the first pole 21 and the second pole 22 .
  • first adapter 31, the first tab 21, the second tab 22, and the second adapter 32 generally do not protrude from the end surface of the battery core 2 (the end surface of the battery core 2 facing the first side plate 11).
  • the edge of the battery core 2 does not protrude from the outer edge of the battery core 2 in either the thickness direction or the width direction, that is, the projection of the battery core 2 on the first side plate 11 covers the first adapter 31 on the first side plate 11
  • the projection of the battery core 2 on the first side plate 11 covers the projection of the first tab 21 on the first side plate 11
  • the projection of the battery core 2 on the first side plate 11 covers the second tab 22
  • the projection of the battery core 2 on the first side plate 11 covers the projection of the second adapter 32 on the first side plate 11 .
  • the pole 42 penetrates the first side plate 11 and is connected to the second adapter.
  • the pole posts 42 are generally formed to protrude outward along the thickness direction of the external connection piece 41 , that is, the axial direction of the pole posts 42 is parallel to the thickness direction of the external connection piece 41 .
  • the first side plate 11 is provided with a fifth through hole 110 corresponding to the pole 42 , and the pole 42 passes through the fifth through hole 110 to penetrate the first side plate 11 and be connected to the second adapter 32 .
  • the second adapter 32 includes a third through hole 320 corresponding to the pole 42.
  • the pole 42 penetrates the first side plate 11 and is connected to the second adapter 32 through the third through hole 320.
  • the fifth through hole 110 and the third through hole 320 may be coaxially disposed.
  • the cross section of the pole 42 perpendicular to the axial direction of the pole 42 is circular (Fig. 11), or the pole has a tapered structure, that is, in the direction away from the external piece 41 (from the first side plate 11 direction toward the second adapter 32 ), the diameter of the pole 42 tends to increase or decrease.
  • the diameter of the pole 42 is the diameter of the cross section of the pole 42 perpendicular to the axial direction of the pole 42 .
  • the diameter of the pole 42 shows a changing trend (i.e., increases or decreases) along the direction from the first side plate 11 to the second adapter 32 , and this change It can be a gradual change, that is, a uniform increase or decrease with essentially the same amplitude.
  • the aperture (diameter) of the fifth through hole 110 and the third through hole 320 changes correspondingly with the diameter of the pole post 42 .
  • the diameter of the pole post 42 gradually changes.
  • the diameters of the fifth through hole 110 and the third through hole 320 also gradually increase; along the direction from the first side plate 11 to the second adapter 32 , the diameter of the pole post 42 gradually decreases, so At this time, the diameters of the fifth through hole 110 and the third through hole 320 also gradually decrease.
  • the third through hole 320 of the second adapter 32 includes a first hole 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; pole One end of the post 42 close to the battery core 2 extends outward to form an extension portion 421 corresponding to the second hole section.
  • first hole section and the second hole section can be arranged coaxially, the first hole section and the second hole section are both circular through holes, and the diameter of the second hole section is larger than that of the first hole section and the second hole section.
  • the diameter of one end of the connection preferably, the diameter of the second hole segment is larger than the diameter of the first hole segment, and the axial projection of the second hole segment perpendicular to the third through hole 320 can cover the first hole segment perpendicular to the third through hole 320.
  • Axial projection of hole 320 Axial projection of hole 320.
  • the cross-sectional area of the external piece 41 perpendicular to the axial direction of the pole 42 can be larger than the cross-sectional area of the pole 42 perpendicular to the axial direction of the pole 42 , and the projection of the external piece 41 perpendicular to the axial direction of the pole 42 covers the pole.
  • the cross-sectional area of the extension 421 perpendicular to the pole 42 is larger than the cross-sectional area of the pole 42 perpendicular to the axial direction of the pole 42.
  • the extension 421 is perpendicular to the pole.
  • the axial projection of 42 covers the projection of the pole 42 perpendicular to the axial direction of the pole 42.
  • the cross-sectional area of the external piece 41 perpendicular to the axial direction of the pole 42 is larger than the cross-sectional area of the extension 421 perpendicular to the axial direction of the pole 42.
  • the cross-sectional area, the projection of the external piece 41 perpendicular to the axial direction of the pole 42 covers the projection of the extension 421 perpendicular to the axial direction of the pole 42, and the cross-sectional area of the extension 421 perpendicular to the axial direction of the pole 42 is substantially equal to the second
  • the cross-sectional area of the hole section is perpendicular to the axial direction of the pole 42, and the extension 421 is engaged with the second hole section and connected with the side wall of the second hole section.
  • the end surface of the pole 42 close to the battery core 2 can be flush with the surface of the second adapter 32 close to the battery core 2, which not only ensures the bonding strength of the pole 42 and the second adapter 32, but also prevents the pole from 42 causes interference with the connection between the second tab 22 or the fifth connecting piece 55 and the second adapter 32 .
  • the thickness of the extension portion 421 along the axial direction of the third through hole 320 is substantially equal to the depth of the second hole segment along the axial direction of the third through hole 320 , whereby the extension portion 421 is locked in the second hole section, and the end surface of the extension 421 close to the battery core 2 is flush with the side surface of the second adapter 32 facing the battery core 2 .
  • the end of the pole post 42 close to the battery core 2 can also extend out of the third through hole 320, and extend outward along the circumferential direction of the third through hole 320 to form a side with the second adapter 32 close to the battery core 2.
  • the surface-connected extension 421, that is, the end surface of the pole 42 close to the battery core 2 is not flush with the surface of the second adapter 32 facing the battery core 2, but is located between the second adapter 32 and the battery core. 2, at this time, the distance between the sealing member 9 and the battery core 2 is no greater than the distance between the extension part 421 of the pole and the battery core 2.
  • the external connecting piece, the pole post 42 and the extension part 421 can be integrally formed, and they can be made of metal.
  • the second adapter 32 and the first side plate 11 can be riveted through rivets. After riveting, the rivets
  • An external piece 41 is formed on one end of the first side plate 11 away from the cavity, an extension 421 is formed on the other end, and a pole 42 is formed between the two ends.
  • the formed pole 42 is, for example, a tapered structure.
  • the second tab 22 is insulated from the case 1 , and specifically the insulation can be performed by providing an insulating sheet (insulating layer).
  • a first insulating sheet 6 is disposed between the external piece 41 and the first side plate 11
  • a third insulating piece 6 is disposed between the second adapter 32 and the first side plate 11 .
  • Two insulating sheets 7, namely the external sheet 41, the first insulating sheet 6, the first side plate 11, the second insulating sheet 7, and the second adapter 32 are stacked in sequence, and the pole 42 penetrates the first insulating sheet 6 and the second adapter 32.
  • a first insulating layer 81 is provided between the pole 42 and the first side plate 11, whereby the external piece 41, the pole 42, the second adapter 32 and the second tab 22 are electrically connected. And is insulatedly connected to the first side plate 11 (casing 1).
  • the difference between the diameter of the third through hole 320 and the diameter of the pole 42 is substantially equal to the width of the first insulating layer 81 along the circumferential direction of the third through hole 320 .
  • the circumferential direction of the hole 320 is perpendicular to the axial direction of the third through hole 320 .
  • the first insulating layer 81 can be integrally formed with the first insulating sheet 6 , and the first insulating layer 81 protrudes outward from the side of the first insulating sheet 6 close to the first side plate 11 (into the second through hole 110 protrusions); or the first insulating layer 81 can be integrally formed with the second insulating sheet 7, and the first insulating layer 81 protrudes outward from the side of the second insulating sheet 7 close to the first side plate 11 (toward the second through hole). Protrusions in the hole 110) are formed.
  • the first insulating sheet 6 is provided with a sixth through hole 60, and the pole post 42 passes through the sixth through hole 60 to penetrate the first insulating sheet 6; the second insulating sheet 7 is provided with a fourth through hole 70, The pole post 42 passes through the fourth through hole 70 to penetrate the second insulating sheet 7 .
  • the pole 42 passes through the sixth through hole 60 , the fifth through hole 110 , the fourth through hole 70 , and the third through hole 320 in order to achieve connection with the second adapter 32 .
  • the sixth through hole 60 , the fifth through hole 110 , the fourth through hole 70 and the third through hole 320 may be coaxially arranged.
  • the projection of the first insulating sheet 6 on the first side panel 11 can cover the projection of the external sheet 41 on the first side panel 11 (that is, the projection of the external sheet 41 on the first side panel 11 is in the same position as the projection of the first insulating sheet 6 on the first side panel 11 (inside the projection on the side panel 11), thereby preventing the external connecting piece 41 from contacting the housing 1 and ensuring the insulation of the housing.
  • the projection of the second insulating sheet 7 on the first side plate 11 can cover the projection of the second adapter 32 on the first side plate 11 (that is, the projection of the second adapter 32 on the first side plate 11 Projected within the projection of the second insulating sheet 7 on the first side plate 11 ), thereby preventing the second adapter 32 from contacting the housing 1 and ensuring the insulation of the housing.
  • battery performance such as safety and stability can be further improved.
  • the second adapter 32 may be block-shaped (or called a second adapter block), and its thickness direction may be parallel to the direction from the first side plate 11 to the second tab 22 , that is, the second adapter
  • the length 32 in the direction from the first side plate 11 to the second tab 22 is the thickness of the second adapter 32 .
  • the direction from the first side plate 11 to the first tab 21 , the direction from the first side plate 11 to the second tab 22 , and the direction from the first side plate 11 to the battery core 2 are parallel.
  • the length c 2 of the second adapter 32 in the direction from the first side plate 11 to the second tab 22 is 1 mm to 3 mm, such as 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc.
  • the first tab 21 is electrically connected to the case 1, and the second tab 22 is insulatedly connected to the case 1.
  • the above-mentioned battery may also include a second connector located between the battery core 2 and the first side plate 11 , and the second connector is connected to the second tab 22 and the second adapter 32 respectively (i.e., the second adapter 32 Connected to the second tab 22 through the second connector), specifically, the second adapter 32, the second connector, and the second tab 22 may be welded in sequence.
  • the second connecting member may include a fifth connecting piece 55 connected to the second adapter 32 and an eighth connecting piece 58 connected to a side of the second tab 22 away from the battery core 2 .
  • the second connecting member may have a bent structure, the fifth connecting piece 55 is connected to the second adapter 32, and the eighth connecting piece 58 is connected to the second tab 22. Specifically, it may be welded.
  • a third included angle is formed between the side of the second adapter 32 that connects with the fifth connecting piece 55 and the side that connects the eighth connecting piece 58 with the second tab 22 .
  • the range of the third included angle is 80-80 120°, such as 80°, 90°, 100°, 110°, 120°, that is, the two are not parallel, and may be perpendicular to each other, thereby further improving the connection between the second adapter 32 and the second pole through the second connector.
  • the stability of the ear 22 connection is improved, thereby improving the stability, safety and service life of the battery.
  • a fourth included angle is formed between the side of the second adapter 32 that is connected to the fifth connecting piece 55 and the side of the second adapter 32 facing the first side plate 11 , and the range of the fourth included angle is 80° -120°, such as 80°, 90°, 100°, 110°, 120°, that is, the two are not parallel, for example, they can be perpendicular.
  • the side of the fifth connecting piece 55 that is in contact with the second adapter 32 is parallel to the surface of the electrode piece.
  • the second connecting member further includes a second connecting component connected to the fifth connecting piece 55 and the eighth connecting piece 58 respectively.
  • the second connecting component includes a sixth connecting piece 56 and a sixth connecting piece 56 .
  • the seventh connecting piece 57 and the sixth connecting piece 56 are located between the second adapter 32 and the battery core 2; in the direction from the second adapter 32 to the second tab 22, the seventh connecting piece 57 is located between the second adapter 32 and the battery core 2.
  • the fifth connecting piece 55, the sixth connecting piece 56, the seventh connecting piece 57, and the eighth connecting piece 58 are connected in sequence.
  • the second connecting piece has a multiple bending structure, and its fifth connecting piece 55 is connected to the eighth connecting piece 58 through the sixth connecting piece 56 and the seventh connecting piece 57 in sequence, and the surface of the fifth connecting piece 55 is connected to the eighth connecting piece 58 .
  • the surfaces of the six connecting pieces 56 are not parallel, for example, perpendicular.
  • the surfaces of the sixth connecting piece 56 and the seventh connecting piece 57 are not parallel, and may be perpendicular or non-perpendicular.
  • the surfaces of the eighth connecting piece 58 and the surfaces of the sixth connecting piece 56 are not parallel. The surfaces may be parallel, thereby further improving the stability of the connection between the second adapter 32 and the second tab 22 .
  • the fifth connecting piece 55 and the second adapter 32 may be welded, and a welding mark is formed on the side of the fifth connecting piece 55 away from the second adapter 32 . Specifically, there is an overlapping area between the projection of the second adapter 32 in the thickness direction of the battery core 2 and the projection of the fifth connecting piece 55 in the thickness direction of the battery core 2, and the welding area between the two is located in the overlapping area.
  • a fourth insulating layer 84 may also be included, and the fourth insulating layer 84 is located between the second connector and the first side plate 11 .
  • the fourth insulating layer 84 may include a fourth portion located on a side of the eighth connecting piece 58 facing away from the second tab 22 .
  • the fourth insulating layer 84 further includes a fifth portion extending from an end of the fourth portion close to the first surface of the battery core 2 in a direction close to the battery core 2 and a third portion formed from the fourth portion close to the battery core 2 .
  • a sixth part is formed by extending one end of the second surface in a direction close to the battery core 2 .
  • the fifth part, the fourth part and the sixth part of the fourth insulating layer 84 are connected in sequence and surrounded by a second groove.
  • the bottom wall of the second groove is the third part of the fourth insulating layer 84 .
  • the side walls are respectively the fifth part and the sixth part of the fourth insulating layer 84, the second tab 22, and the part where the second connector is connected to the second tab 22 (such as the eighth connecting piece 58, The fourth connecting portion 552) of the fifth connecting piece 55 located on the side of the second tab 22 is located in the second groove and covered by the fourth insulating layer 84, thereby further improving the stability, safety and other performance of the battery.
  • the second tab 22 has an opposite first side and a second side.
  • the first side of the second tab 22 and the second side of the second tab 22 are respectively located between the second tab 22 and the eighth connection. Opposite sides of the side where the pieces 58 meet.
  • the fourth insulating layer 84 includes a fourth portion located on a side of the eighth connecting piece 58 facing away from the second tab 22 , a fifth portion located on the first side of the second tab 22 , and a fifth portion located on the second side of the second tab 22 .
  • the projection of the second tab 22 in the thickness direction of the battery core 2 is located within the projection of the fifth part of the fourth insulating layer 84 in the thickness direction of the battery core 2 , and the second tab 22 is in the thickness direction of the battery core 2 .
  • the projection of the sixth part of the fourth insulating layer 84 in the thickness direction of the core 2 is located within the projection of the sixth part of the fourth insulating layer 84 in the thickness direction of the core 2 .
  • the projection of the second tab 22 in the length direction of the battery core 2 is located in the fourth insulating layer.
  • the fourth part of 84 is within the projection in the length direction of the battery core 2 , that is, the fourth insulating layer 84 completely covers the second tab 22 and the part where the second connector is connected to the second tab 22 .
  • the direction from the fifth part to the second tab 22, the direction from the sixth part to the second tab 22, the direction from the fifth part to the sixth part, and the thickness direction of the battery core 2 can be parallel, and the direction from the fourth part to the second tab 22 can be parallel.
  • the direction of the diode tabs 22 is parallel to the length direction of the battery core 2 .
  • the fifth portion of the fourth insulating layer 84 extends to the first side of the battery core 2 and is bonded to the electrode sheet located on the first side of the battery core 2
  • the sixth portion of the fourth insulating layer 84 Extending to the second surface of the battery core 2 and bonded to the electrode sheet located on the second surface of the battery core 2, the fourth insulating layer 84 wraps around the side of the battery core 2, which can further improve the stability of the battery core 2.
  • a fifth insulating layer 85 may be disposed between the second connecting member and the battery core 2 .
  • the fifth insulating layer 85 may be located between the sixth connecting piece 56 and the battery core 2 to avoid the second The connecting piece is in contact with the electrode piece of the opposite polarity in the battery cell 2 and is short-circuited.
  • the fifth insulating layer 85 extends to the first side of the battery core 2 and is bonded to the electrode sheet located on the first side of the battery core 2 , and the fifth insulating layer 85 extends to the second side of the battery core 2 And it is bonded to the electrode sheet located on the second side of the battery core 2. In this way, the fifth insulating layer 85 wraps around the side of the battery core 2, and can also fix the battery core 2 and improve the stability of the battery core 2.
  • the electrode sheet located on the first side of the battery core 2 and the electrode sheet located on the second side of the battery core 2 are respectively the outermost electrode sheets of the battery core 2, that is, the remaining electrode sheets are stacked and arranged on the battery core 2. between the electrode sheets on the first side of the battery core 2 and the electrode sheets on the second side of the battery core 2 .
  • the polarity of the electrode sheet located on the first side of the battery core 2 and the polarity of the electrode sheet located on the second side of the battery core 2 may be the same or different. They may be positive electrode sheets or negative electrode sheets, and may be the first electrode sheet or the second electrode sheet. Generally, it is preferred that the electrode sheet located on the first side of the battery core 2 and the electrode sheet located on the second side of the battery core 2 are negative electrode sheets.
  • the housing 1 can be a metal packaging shell, that is, it can 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 , and the fifth side plate 15
  • the sixth side plate 16 may be made of metal, such as aluminum, aluminum alloy, nickel, iron or nickel-iron alloy.
  • the housing 1 when the housing 1 is electrically connected to the positive terminal, the housing 1 can be made of the same polarity material as the positive terminal, such as aluminum or aluminum alloy respectively.
  • the specific materials of the two can be the same or different (the two materials can be the same or different).
  • the materials are different, for example, the material of the positive electrode ear is aluminum, and the material of the housing 1 is aluminum alloy); when the housing 1 and the negative electrode ear are electrically connected, the housing 1 and the negative electrode ear are made of the same polarity, such as nickel respectively. , iron or nickel-iron alloy, the specific material types of the two can be the same or different.
  • the material of the first adapter 31, the material of the first connector, 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 adapter 31 The material, the material of the first connecting piece, and the material of the first tab 21 can be aluminum or aluminum alloy respectively, and their specific material types can be the same or different.
  • the material of the second adapter 32 , the material of the second connector, and the material of the second tab 22 may be materials of the same polarity.
  • the second tab 22 is a negative tab
  • the second adapter 32 The material of , the material of the second connecting member, and the material of the second tab 22 can respectively be nickel, iron or nickel-iron alloy, and their specific material types can be the same or different.
  • the battery in the embodiment of the present invention may specifically include a lithium-ion battery, but is not limited thereto.

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  • Connection Of Batteries Or Terminals (AREA)

Abstract

本发明提供一种电池，包括：壳体，围设成腔体；所述壳体设有与所述腔体连通的第一通孔；密封件，设于所述腔体内，用于在自然状态时密封所述第一通孔、在受力状态时远离所述第一通孔。本发明能够提高电池的密封性等性能。

Description

电池 技术领域
本发明涉及一种电池，属于电化学储能装置领域。
背景技术
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，对电池的密封性和安全性等性能的要求也越来越高。在电池的制作过程中，通常会涉及至少两次注液(注入电解液)-化成的过程，在一次注液后，需要将注液孔通过橡胶塞等部件堵住，以防止电池转移或化成过程中电解液外溢或水汽进入。然而，采用橡胶塞等部件将注液孔堵住的方式，一方面，增加制造流程和成本，另一方面，其对注液孔的密封效果不理想，影响电池产品的性能。
发明内容
本发明提供一种电池，能够提高电池的密封性和安全性等性能，并可以提高电池的制作良率，降低电池成本。
本发明提供一种电池，包括：壳体，围设成腔体；所述壳体设有与所述腔体连通的第一通孔；密封件，设于所述腔体内，用于在自然状态时密封所述第一通孔、在受力状态时远离所述第一通孔。
可选地，所述电池还包括位于所述腔体内的电芯，所述密封件与所述电芯的距离大于0。
可选地，所述电池还包括位于所述腔体内的电芯，所述密封件与所述电芯之间设有第二绝缘层。
可选地，所述壳体包括第一侧板，所述第一通孔设于所述第一侧板；所述密封件包括与所述第一侧板连接的连接部、以及与所述连接部连接的密封部。
可选地，所述连接部包括与所述密封部连接的第一连接区、以及位于所 述第一连接区的相对两侧的第三连接区，所述第三连接区与所述第一侧板连接。
可选地，所述连接部与所述第一侧板连接的一面平行于所述连接部与所述密封部连接的一面。
可选地，所述连接部与所述第一侧板焊接；或者，所述连接部与所述第一侧板通过垫片连接。
可选地，所述电池还包括设于所述第一侧板与所述密封件之间的第一转接件，所述第一转接件设有与所述第一通孔连通的第二通孔，所述连接部与所述第一转接件连接。
可选地，所述第一转接件背离所述第一侧板的一侧设有与所述第二通孔连通的第一凹槽，所述密封件设于所述第一凹槽内。
可选地，所述电池还包括位于所述腔体内的电芯，所述电芯设有第一极耳，所述第一转接件与所述第一极耳电连接。
可选地，所述电池还包括位于所述腔体内的第一连接件，所述第一连接件分别与所述第一极耳和所述第一转接件连接。
可选地，所述第一转接件包括相连的第一转接部和第二转接部，所述第二通孔设于所述第一转接部，其中，所述第一连接件与所述第二转接部连接；和/或，所述第一转接部分别与所述第一侧板、所述连接部连接。
可选地，沿所述第一连接区至所述第三连接区的方向平行于所述第一侧板的长度方向。
可选地，所述连接部为弧形结构；或者，所述连接部还包括连接所述第一连接区和所述第三连接区的第二连接区，其中，在所述自然状态下，所述第一连接区、所述第二连接区、所述第三连接区的表面齐平；或者，所述第二连接区包括至少一个弧形段，或者，所述第二连接区包括至少两个连接段，其中每相邻的两个连接段之间形成夹角。
可选地，所述第二连接区包括一个弧形段，该弧形段的凹面为其面向所述第一侧板的一面；或者，所述第二连接区包括至少两个弧形段，其中每相邻的两个弧形段中的一者的凹面与另一者的凹面分别位于所述第二连接区的相对两侧。
可选地，所述至少两个弧形段的分布方向平行于沿所述第一侧板至所述 密封件的方向；或者，所述至少两个弧形段的分布方向垂直于沿所述第一侧板至所述密封件的方向。
可选地，所述至少两个连接段的分布方向平行于沿所述第一侧板至所述密封件的方向；或者，所述至少两个连接段的分布方向垂直于沿所述第一侧板至所述密封件的方向。
可选地，所述密封部在所述第一侧板上的投影覆盖所述第一通孔。
可选地，所述密封部在所述第一侧板上的投影覆盖所述第二通孔。
可选地，所述密封部面向所述第一通孔的一面为平面或曲面。
可选地，所述密封部为多边型、圆柱型、半球型或球型。
可选地，所述密封部至少部分延伸至所述第一通孔内。
可选地，所述密封部至少部分延伸至所述第二通孔内。
可选地，所述密封部与所述连接部一体成型；或者，所述密封部与所述连接部粘接。
可选地，所述连接部面向所述密封部的一侧设有第二凹槽，所述密封部部分嵌入所述第二凹槽内。
可选地，所述密封部为金属或非金属材质；和/或，所述连接部为金属或非金属材质。
可选地，所述密封部为柔性材质。
可选地，所述密封部为橡胶材质或塑料材质。
可选地，所述塑料材质为PET塑料材质。
可选地，所述电池还包括位于所述腔体内的电芯，所述电芯设有第二极耳；所述电池还包括转接组件，所述转接组件包括位于所述腔体内的第二转接件、以及位于所述第一侧板背离所述腔体的一侧的外接片，所述外接片包括向外凸起形成极柱，所述极柱穿透所述第一侧板与所述第二转接件、第二极耳连接。
可选地，所述密封件至所述电芯的距离不大于所述转接组件至所述电芯的距离。
可选地，所述电池还包括密封所述第一通孔的封口片，所述封口片位于所述壳体背离所述腔体的一侧。
本发明中，在腔体内设置密封件，该密封件具有弹性，在自然状态时密 封第一通孔，在受力状态时远离第一通孔，由此，一方面，在电池的制作过程中，当需要多次注入电解液时，每次注入电解液后，密封件自动复位，对第一通孔进行密封，避免电池转移或化成等过程中电解液外溢或水汽进入腔体等情况，从而提高电池产品的性能，并便于电池的制作，提高制作良率，简化制作流程，降低成本；另一方面，在电池产品中，密封件处于自然状态，通过密封件对第一通孔的密封，可以提高电池的密封性等性能。
附图说明
图1为本发明一实施例的自然状态下密封件与壳体的结构示意图；
图2为本发明一实施例的自然状态下密封件与壳体的结构示意图；
图3为本发明一实施例的自然状态下密封件与壳体的结构示意图；
图4为本发明一实施例的自然状态下密封件与壳体的结构示意图；
图5为本发明一实施例的受力状态下密封件与壳体的结构示意图；
图6为本发明一实施例的自然状态下密封件与壳体的结构示意图；
图7为本发明一实施例的自然状态下密封件与壳体的结构示意图；
图8为本发明一实施例的密封件的结构示意图；
图9为本发明另一实施例的密封件的结构示意图；
图10为本发明另一实施例的密封件的结构示意图；
图11为本发明一实施例的电池结构示意图。
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；10：第一通孔；151：减薄部；110：第五通孔；101：封口片；2：电芯；21：第一极耳；22：第二极耳；31：第一转接件；310：第二通孔；311：第一转接部；312：第二转接部；313：第三转接部；32：第二转接件；320：第三通孔；41：外接片；42：极柱；421：外延部；51：第一连接片；52：第二连接片；53：第三连接片；54：第四连接片；55：第五连接片；56：第六连接片；57：第七连接片；58：第八连接片；6：第一绝缘片；60：第六通孔；7：第二绝缘片；70：第四通孔；81：第一绝缘层；82：第二绝缘层；83：第三绝缘层；84：第四绝缘层；85：第五绝缘层；9：密封件；91：密封部；921：第一连接区；922：弧形段；923：第三连接区。
具体实施方式
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。
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”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，也可以是通信连接(网络连接)；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”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。
电池的密封性、稳定性和安全性等性能是影响电池推广和应用的重要因素，因此，亟待提高电池的密封性、稳定性和安全性等性能。此外，在电池的制作过程中，通常会涉及至少两次注液(注入电解液)-化成的过程，在一次注液后，需要将注液孔通过橡胶塞等部件堵住，以防止电池转移或化成过程中电解液外溢或水汽进入。然而，采用橡胶塞等部件将注液孔堵住的方式，一方面，增加制造流程和成本，另一方面，其对注液孔的密封效果不理想，影响电池产品的性能。
本发明实施例提供一种电池，如图1至图11所示，该电池包括：壳体1，围设成腔体；壳体1设有与腔体连通的第一通孔10；密封件9，设于腔体内，用于在自然状态时密封第一通孔10、在受力状态时远离第一通孔10。
其中，自然状态是密封件与壳体等部件连接后的自然形态，即密封件不受力的状态，第一通孔10可以作为用于向腔体内注入电解液的注液孔，当注入电解液时，电解液对密封件9产生压力，将密封件9顶开，即使密封件9处于受力状态，从而远离第一通孔10，与第一通孔10之间形成连通第一通孔10和腔体的通道/缝隙，使电解液注入腔体内；当电解液注入完成后，密 封件9自动复位，恢复自然状态，对第一通孔10进行密封。
由此，在电池的制作过程中，当需要多次注入电解液时，每次注入电解液后，密封件9自动复位，对第一通孔10进行密封，避免电池转移或化成等过程中电解液外溢或水汽进入腔体等情况，从而便于电池的制作，提高制作良率，简化制作流程，降低成本，同时还可以优化电池产品的性能。
此外，在制造完成的电池产品中，密封件9处于自然状态，通过密封件9对第一通孔10的密封，可以提高电池的密封性等性能。
如图1至图7、图11所示，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、第二侧板12、第三侧板13、第四侧板14依次相接，并均分别位于第六侧板16(或称底板)和第五侧板15(或称盖板)之间，由此围设成密闭腔体。第一侧板11与第三侧板13位于第二侧板12(或第四侧板14)的相对两侧，第二侧板12与第四侧板14位于第一侧板11(或第三侧板13)的相对两侧，第五侧板15和第六侧板16分别位于第一侧板11(或第二侧板12、或第三侧板13、或第四侧板14)的相对两侧。第五侧板15至第六侧板16的方向为壳体1的厚度方向，第一侧板11至第三侧板13的方向可以为壳体1的长度方向，第二侧板12至第四侧板14的方向为壳体1的宽度方向，或者第一侧板11至第三侧板13的方向为壳体1的宽度方向，而第二侧板12至第四侧板14为壳体1的长度方向。
其中，第一通孔10具体可以设于第一侧板11。
第一侧板11和第二侧板12之间、第二侧板12与第三侧板13之间、第三侧板13与第四侧板14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，该圆弧过渡部17的凹面为面向腔体的一面。
如图11所示，壳体1上还可以设有减薄部151，具体可以在第五侧板15上设置减薄部151，减薄部151的机械强度小于壳体1除减薄部151外的其他部分的机械强度，例如减薄部151的厚度小于壳体1上除减薄部151外的其他部分的厚度，由此，当电池内部压力过大时，可以优先通过减薄部151泄压，以避免电池爆炸等现象的发生。
如图11所示，电池还包括位于腔体内的电芯2，电芯2包括第一极耳21和第二极耳22，第一极耳21与第二极耳22的极性可以相反，例如，第一极 耳21为正极极耳，第二极耳22为负极极耳，或者，第一极耳21为负极极耳，第二极耳22为正极极耳。
具体地，电芯2包括多个层叠设置的电极片，该电极片包括第一电极片和极性与第一电极片相反的第二电极片，二者之间被隔膜隔开，第一电极片可以为正极片或负极片，相应地，第二电极片可以为负极片或正极片。第一电极片包括第一集流体，第一极耳21设置在第一集流体上，第二电极片包括第二集流体，第二极耳22设置在第二集流体上。
第一极耳21和第二极耳22设于电芯2面向第一侧板11的一侧，电芯2面向第一侧板的一侧的端面与电芯2的厚度方向/第一电极片的厚度方向/第二电极片的厚度方向平行，即极耳(第一极耳21/第二极耳22)设置在集流体(第一集流体/第二集流体)的端部，电芯2面向第一侧板11的一侧的端面由多个层叠设置的电极片(第一电极片/第二电极片)设有极耳的一侧的端面(电极片平行于其厚度方向的端面)形成。
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，具体是由第一电极片、隔膜、第二电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。
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，电极片沿电芯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；第一侧板11至电芯2的方向可以平行于壳体1的长度方向，第一侧板11的表面、第二侧板12的表面可以与电极片的表面垂直
具体地，密封件9具有弹性，其可以在不同受力状态下发生弹性形变，以靠近并密封第一通孔10、或远离第一通孔10。
具体地，密封件9可以包括与第一侧板11连接的连接部、以及与连接部连接的密封部，通过密封部密封第一通孔10或远离第一通孔10以形成连通第一通孔10与腔体的通道。
如图1至图11所示，连接部具体可以是用于进行弹性形变以支撑密封部91密封第一通孔10或远离第一通孔10的弹性支撑部；该弹性支撑部/连接部包括与密封部91连接的第一连接区921、以及位于第一连接区921的相对两 侧的第三连接区923，第三连接区923与第一侧板11连接。
此外，连接部还包括连接第一连接区921和第三连接区923的第二连接区，第二连接区一般是发生弹性形变的主功能区。
在一些实施例中，在自然状态下，第一连接区921、第二连接区、第三连接区923的表面齐平，连接部具体可以为平直结构，例如平直的片状结构。
在另一些实施例中，第二连接区包括至少一个弧形段922。
如图4至图8所示，第二连接区包括一个弧形段922，该弧形段922的凹面为其面向第一侧板11的一面，在自然状态下，相当于连接部在第二连接区朝向电芯2形成凸起，第二连接区与第一侧板11之间存在间隙，其至电芯2的距离大于第一连接区921和第三连接区923至电芯2的距离。
此外，第二连接区还可以是弹簧结构，如图1至图3、图9和图10所示，第二连接区包括至少两个弧形段922，其中每相邻的两个弧形段922中的一者的凹面与另一者的凹面分别位于第二连接区的相对两侧，使两个弧形段922相接之后的形状为“S”型。
示例性地，如图1至图3、图10所示，上述至少两个弧形段922的分布方向平行于沿第一侧板11至密封件9的方向，即第二连接区的所有弧形段922沿第一侧板11至密封件9的方向分布，此时，弧形段922的切线例如可以垂直于第一侧板11。
示例性地，如图9所示，至少两个弧形段922的分布方向垂直于沿第一侧板11至密封件9的方向，此时，弧形段922的切线平行于第一侧板11。其中，第二连接区的所有弧形段922具体可以沿第一侧板11的长度方向分布。
上述弧形段922例如是半圆弧段，但不局限于此。
在另一些实施例中，第二连接区包括至少两个连接段，该连接段为直线段，其中每相邻的两个连接段之间形成夹角，由此使第二连接区为弹簧结构。
示例性地，至少两个连接段的分布方向平行于沿第一侧板11至密封件9的方向，或者，至少两个连接段的分布方向垂直于沿第一侧板11至密封件9的方向。
此外，连接部还可以为弧形结构，即第一连接区921、第二连接区、第三连接区923依次相连后，形成的连接部的整体结构为弧形，其凹面为面向第一侧板11的一面，该弧形结构可有效提供其结构强度，防止多次弯折后折 断。
如图1至图7所示，连接部/第三连接区923与第一侧板11连接的一面平行于第一连接区921与密封部91连接的一面。
如图1至图5所示，连接部/第三连接区923与第一侧板11直接连接，例如焊接，此时第二连接区一般为具有弯折结构(如上述圆弧段)的折弯区。
或者，连接部/第三连接区923与第一侧板11也可以通过垫片连接，此时，第二连接区可以为具有弯折结构的折弯区，也可以为平直结构，例如连接部整体为平直结构。
一般情况下，在自然状态时，密封部91与第一通孔10过盈配合，以实现密封；其中，密封部91在第一侧板11上的投影覆盖第一通孔10，密封部91在第一侧板11上的投影的面积大于第一通孔10在第一侧板11上的投影面积。
其中，密封部91可以不延伸至第一通孔10内，即密封部91与第一侧板11抵接，或者至少部分延伸至第一通孔10内。
此外，密封件9的长度方向平行于第一侧板11的长度方向或第一侧板11的宽度方向；沿第一连接区921至第三连接区923的方向可以平行于第一侧板11的长度方向(如图1至图7、图11所示)，也可以平行于第一侧板11的宽度方向；沿第一连接区921至第三连接区923的方向优选平行于密封件9的长度方向。
如图6、图7和图11所示，电池还包括设于第一侧板11与密封件9之间的第一转接件31，第一转接件31可以与第一极耳21电连接，用于将电芯2中的电性引出，连接外围电路(如安装该电池的电子产品的电路)。
其中，第一转接件31在第一侧板11上的投影与第一极耳21在第一侧板11上的投影不重叠(即第一转接件31平行于第一侧板11的延伸方向的投影与第一极耳21平行于第一侧板11的延伸方向的投影不重叠)，由此，第一极耳21和第一转接件31不沿电芯2至第一侧板11的方向分布，具体来说，在沿第一侧板11至电芯2的方向上，第一侧板11至电芯2的距离为a1，第一极耳21与电芯2相接的一侧至第一极耳21背离电芯2的一侧(即面向第一侧板11的一侧)的距离为b1，第一转接件31面向电芯2的一侧(即背离第一侧板11的一侧)至第一转接件31面向第一侧板11的一侧(即第一转接 件31在沿第一侧板11至电芯2的方向上的长度)为c1，a1＜b1+c1，由此，相比于极耳和转接件沿壳体的长度方向排布的方式，该实施例的技术方案可使得电芯和第一侧板之间的空间得到充分的利用，可以节约腔体空间，从而可增大电芯的尺寸，提高电池的能量密度。
此外，第一转接件31在第二侧板12上的投影与第一极耳21在第二侧板12上的投影至少部分重叠(即第一转接件31垂直于第一侧板11的延伸方向的投影与第一极耳21垂直于第一侧板11的延伸方向的投影至少部分重叠)，即第一转接件31与第一极耳21沿第一侧板11的延伸方向分布，由此，便于第一极耳21与第一转接件31的连接，进一步节省腔体空间。
其中，第一侧板11的延伸方向与第一侧板11的表面平行，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。示例性地，如图11所示，第一侧板11的延伸方向是壳体1的宽度方向。
如图11所示，第一转接件31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，即第一转接件31与第一极耳21沿电芯2的宽度方向分布。
如图6、图7、图11所示，第一转接件31设有与第一通孔10连通的第二通孔310，密封件9与第一转接件31连接，例如焊接或通过垫片连接，在自然状态时，密封部91密封第二通孔310，以实现对第一通孔10的密封，或者，在受力状态时远离第二通孔310，以实现形成连通第一通孔10与腔体的通道，便于电解液的注入。
一般情况下，在自然状态时，密封部91与第二通孔过盈配合，以实现密封；其中，密封部91在第一侧板11上的投影覆盖第二通孔310，密封部91在第一侧板11上的投影的面积大于第二通孔310在第一侧板11上的投影面积。
具体地，密封部91不延伸至第二通孔310内，即密封部91与第一转接件31内侧壁抵接，或者至少部分延伸至第二通孔310内。
其中，第一转接件31与第一侧板11连接，例如焊接，连接部/第三连接区923与第一转接件31连接的一面平行于第一转接件31与第一侧板11连接的一面。
如图6和图7所示，第一转接件31背离第一侧板11的一侧设有与第二 通孔310连通的第一凹槽，密封件9设于第一凹槽内。
具体地，第一转接件31包括依次相连的第二转接部312、第一转接部311和第三转接部313，密封件9设于三者围设成的第一凹槽内。
其中，第二通孔310设于第一转接部311，第一侧板11与第一转接部311连接，具体可以焊接，第三连接区923与第一转接部311连接，具体可以焊接或通过垫片连接。
如图6、图7、图11所示，第一转部311和第二转接部312/第三转接部313之间形成有夹角，该夹角例如不大于90°(即二者表面或所在平面之间形成不大于90°的夹角)。
第二转接部312的一侧与第一转接部311的一侧相接，第二转接部312的另一侧沿第一转接部311的厚度方向(第一转接部311背离第一侧板的方向)向外延伸，第三转接部313的一侧与第一转接部311的另一侧相接，第三转接部313的另一侧沿第一转接部311的厚度方向向外延伸，第一转接部311、第二转接部312、第三转接部313的长度方向及长度可以相同，第二转接部312与第三转接部313的宽度方向及宽度可以相同，其宽度方向与第一转接部311的厚度方向相同。
第二通孔310可以设置在第一转接部311的中部，而不延伸至第二转接部312和第三转接部313，第二通孔310至第二转接部312的距离与第二通孔310至第三转接部的距离可以相等或不等，优选相等。
在第一转接部311垂直于第二通孔310的轴向的投影中，第二通孔310的圆心为第一转接部311的中心点。示例性地，第一转接部311垂直于第二通孔310的轴向的投影为基本规则的四边形，第一转接部311具有相对的第一侧和第三侧、以及相对的第二侧和第四侧，第一侧至第三侧的方向、第二侧至第四侧的方向均垂直于第二通孔310的轴向，第一侧至第三侧的方向与第二侧至第四侧的方向可以相互垂直，第二通孔310至第一转接部311的第一侧的距离基本等于第二通孔310至第一转接部311的第三侧的距离，第二通孔310至第一转接部311的第二侧的距离基本等于第二通孔310至第一转接部311的第四侧的距离。示例性地，第二转接部312与第一转接部311的第一侧相接，第三转接部313与第一转接部311的第三侧相接。
具体地，第二转接部312可以位于第一转接部311面向第五侧板15的一 侧，第三转接部313位于第一转接部311面向第六侧板16的一侧。
一般情况下，第一通孔10的轴向与第一侧板11的厚度方向相同，第二通孔310的轴向与第一转接部311的厚度方向相同。
此外，第一通孔10与第二通孔310在第一侧板11上的投影至少部分重叠。
具体来说，第一通孔10在第一侧板11上的投影的半径为r1，第二通孔310在第一侧板11上的投影的半径为r2，第一通孔10在第一侧板11上的投影的圆心与第二通孔310在第一侧板11上的投影的圆形之间的距离L＜r1+r2。其中，r1≥r2，或r1≤r2。
其中，第一通孔10在第一侧板11上的投影与第二通孔310在第一侧板11上的投影可以部分重叠，或全部重叠，全部重叠的情况具体可以包括：第一通孔10在第一侧板11上的投影与第二通孔310在第一侧板11上的投影中的一者覆盖另一者，即第一通孔10在第一侧板11上的投影覆盖第二通孔310在第一侧板11上的投影，或者第二通孔310在第一侧板11上的投影覆盖第一通孔10在第一侧板11上的投影。
示例性地，第二通孔310在第一侧板11上的投影的半径(或面积)大于第一通孔10在第一侧板11上的投影，且第一通孔10在第一侧板11上的投影位于第二通孔310在第一侧板11上的投影内。
或者，第一通孔10在第一侧板11的投影的半径(或面积)大于第二通孔310在第一侧板11上的投影，且第二通孔310在第一侧板11的投影位于第一通孔10在第一侧板11上的投影内；或者，第一通孔10在第一侧板11的投影与第二通孔310在第一侧板11上的投影重合(二者同轴设置，且r1＝r2)。
如图11所示，上述电池还可以包括位于电芯2与第一侧板11之间的第一连接件，第一连接件分别与第一极耳21和第一转接件31连接，具体可以与第二转接部312连接，例如第二转接部312、第一连接件、第一极耳21依次焊接。
具体地，第一连接件可以包括与第一转接件31/第二转接部312连接的第一连接片51、与第一极耳21的背离电芯2的一侧相接的第四连接片54。
如图11所示，第一连接件可以具有弯折结构，第一连接片51与第一转接件31相接，具体可以与第二转接部312连接，第四连接片54与第一极耳 21相接，具体可以是焊接，第一转接件31与第一连接片51相接的一面和第四连接片54与第一极耳21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°、110°、120°等，即第一转接件31与第一连接片51相接的一面和第四连接片54与第一极耳21相接的一面不平行，例如可以垂直。由此，将第一转接件31与第一连接片51的相接面和第四连接片54与第一极耳21的相接面错开，使该两个相接面基本沿电芯的宽度方向排布，不仅可以减小第一转接件31和第一连接片51在腔体内的占用空间，同时，使得第一转接件31与第一连接片51的连接以及第四连接片54和第一极耳21的连接互不干涉，还可以进一步提高第一转接件31通过第一连接件与第一极耳21连接的稳定性，进而提高电池的稳定性、安全性和使用寿命等品质。
此外，第一转接件31与第一连接片51相接的一面和第一转接件31与第一侧板11相接的一面(第一转接件31面向第一侧板11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°、110°、120°，即二者不平行，例如可以垂直。
此外，第一连接片51与第一转接件31相接的一面可以和电极片的表面平行。
如图11所示，第一连接件还包括分别与第一连接片51和第四连接片54连接起来的第一连接组件，第一连接组件包括第二连接片52和第三连接片53，第二连接片52位于第一转接件31与电芯2之间；在从第一转接件31至第一极耳21的方向上，第三连接片53位于第一转接件31和第一极耳21之间；第一连接片51、第二连接片52、第三连接片53、第四连接片54依次相连。
具体地，第一连接件具有多重弯折结构，其第一连接片51依次通过第二连接片52和第三连接片53与第四连接片54相接，第一连接片51的表面与第二连接片52的表面不平行，例如垂直，第二连接片52的表面与第三连接片53的表面不平行，可以垂直或不垂直，第四连接片54的表面与第二连接片52的表面可以平行，由此，通过设置多重弯折的第一连接片51、第二连接片52、第三连接片53与第四连接片54，以防止第一连接件在左右方向和前后方向晃动，可以进一步提高第一转接件31与第一极耳21连接的稳定性。
具体地，密封部91面向第一通孔10的一面为平面(图4或图7)或曲面(图2和图3)；
此外，密封部91可以为多边型、圆柱型、半球型或球型，其中，多边形例如为四边形，进一步为长方形或正方形。
此外，密封部91为金属或非金属材质，连接部为金属或非金属材质，优选连接部为金属材质，密封部91为柔性材质，例如为橡胶材质或塑料材质，塑料材质具体可以为PET塑料材质。
此外，密封部91与连接部可以一体成型，或者，密封部91与连接部粘接。
在一些具体实施例中，连接部面向密封部91的一侧设有第二凹槽，密封部91部分嵌入第二凹槽内，具体实施时，可以将密封部91材料进行注塑成型，以形成密封部91。
此外，上述电池还可以包括密封第一通孔10的封口片101，封口片101位于壳体1背离腔体的一侧，具体可以位于第一侧板背离腔体的一侧，封口片101可以与第一侧板11连接，例如焊接，封口片101在第一侧板11上的投影覆盖第一通孔10。
此外，密封件9与电芯2的距离大于0，避免密封件9与电芯2接触发生短路等现象，提高电池的稳定性和安全性能。
具体地，密封件9与电芯2之间设有第二绝缘层82，以进一步提高电池的稳定性和安全性能。如图11所示，第二绝缘层82可以位于第一连接件与电芯2之间，具体可以位于第二连接片52与电芯2之间。
在一些实施例中，如图11所示，第二绝缘层82延伸至电芯2的第一面并与位于电芯2的第一面的电极片粘接，第二绝缘层82延伸至电芯2的第二面并与位于电芯2的第二面的电极片粘接，这样，第二绝缘层82包裹在电芯2的侧面，还能够固定电芯2，提高电芯2的稳定性。
此外，如图11所示，上述电池还可以包括第三绝缘层83，第三绝缘层83位于第一连接件和第一侧板11之间。具体地，第三绝缘层83可以包括位于第四连接片54背离第一极耳21的一面的第一部分。
在一些实施例中，电芯2具有相对设置的第一面和第二面，第三绝缘层83还包括自第一部分靠近电芯2的第一面的一端向靠近电芯2的方向延伸形 成的第二部分以及自第一部分靠近电芯2的第二面的一端向靠近电芯2的方向延伸形成的第三部分。
其中，电芯的第一面和第二面平行于电极片的表面(即垂直于电极片/电芯的厚度方向)。
如图11所示，第三绝缘层83的第二部分、第一部分和第三部分依次相连，并围设成第三凹槽，第三凹槽的底壁为第三绝缘层83的第一部分，侧壁分别为第三绝缘层83的第二部分和第三部分，第一极耳21、以及第一连接件与第一极耳21相接的部分(如第四连接片54、第一连接片51位于第一极耳21侧面的第二连接部512)位于第三凹槽内，被第三绝缘层83覆盖，从而避免第一极耳21或第一连接片51与壳体接触，同时对第一极耳21和第一连接件起到保护的作用，防止第一极耳21和第一连接件在电池跌落过程中与壳体发生磕碰，由此，可进一步提高电池的稳定性和安全性等性能。
具体来说，第一极耳21具有相对的第一侧面和第二侧面，第一极耳21的第一侧面与第一极耳21的第二侧面分别位于第一极耳21与第四连接片54相接的一面(即第一极耳21背离电芯2的一面)的相对两侧。第三绝缘层83包括位于第四连接片54背离第一极耳21的一面的第一部分、位于第一极耳21的第一侧面的第二部分、位于第一极耳21的第二侧面的第三部分。
在一些实施例中，第一极耳21在电芯2的厚度方向上的投影位于第三绝缘层83的第二部分在电芯2的厚度方向上的投影内，第一极耳21在电芯2的厚度方向上的投影位于第三绝缘层83的第三部分在电芯2的厚度方向上的投影内，第一极耳21在电芯2的长度方向上的投影位于第三绝缘层83的第一部分在电芯2的长度方向上的投影内，即第三绝缘层83完全覆盖第一极耳21以及第一连接件与第一极耳21相接的部分。其中，第二部分至第一极耳21的方向、第三部分至第一极耳21的方向、第二部分至第三部分的方向、电芯2的厚度方向可以平行，第一部分至第一极耳21的方向与电芯2的长度方向平行。
在一些优选实施例中，第三绝缘层83的第二部分延伸至电芯2的第一面并与位于电芯2的第一面的电极片(靠近壳体1的电极片)粘接，第三绝缘层83的第三部分延伸至电芯2的第二面并与位于电芯2的第二面的的电极片(靠近壳体1的电极片)粘接，由此，第三绝缘层83包裹在电芯2的侧面， 可以进一步提高电芯2的稳定性。
此外，电池还包括与第二极耳22电连接的转接组件，该转接组件具体可以包括位于腔体内的第二转接件32、以及位于第一侧板11背离腔体的一侧的外接片41，外接片41包括向外凸起形成的极柱42，极柱42穿透第一侧板11与第二转接件32、第二极耳22连接。
其中，密封件9至电芯2的距离不大于(等于或小于)转接组件至电芯2的距离，由此可以避免由于密封件9的引入占据额外的腔体空间，从而在提高电池密封性和安全性的同时，兼顾保证和提高电池的能量密度等性能。
具体地，极柱42至电芯2的距离可以大于、等于或小于第二转接件32至电芯2的距离，当极柱42至电芯2的距离大于第二转接件32至电芯2的距离时，密封件9至电芯2的距离不大于极柱42至电芯2的距离；当极柱42至电芯2的距离小于第二转接件32至电芯2的距离时，密封件9至电芯2的距离不大于第二转接件32至电芯2的距离。
具体地，第二转接件32设置在第一侧板11与电芯2之间，第二转接件32在第一侧板11上的投影与第二极耳22在第一侧板11上的投影不重叠(即第二转接件32平行于在第一侧板11的延伸方向的投影与第二极耳22平行于第一侧板11的延伸方向的投影不重叠)。
由此，第二极耳22和第二转接件32不沿电芯2至第一侧板11的方向分布，具体来说，在沿第一侧板11至电芯2的方向上，第一侧板11至电芯2的距离为a1，第二极耳22与电芯2相接的一侧至第二极耳22背离电芯2的一侧(即面向第一侧板11的一侧)的距离为b2，第二转接件32面向电芯2的一侧(即背离第一侧板11的一侧)至第二转接件32面向第一侧板11的一侧(即第二转接件32在沿第一侧板11至电芯2的方向上的长度)为c2，a1＜b2+c2，由此，可以进一步节约腔体空间，提高电池的能量密度等性能。
其中，b2与b1可以相等或不等，c2与c1可以相等或不等。
具体地，第一极耳21、第二极耳22、第一转接件31、第二转接件32在第一侧板上的投影均不互相重叠。
如图11所示，第二转接件32在第二侧板12上的投影与第二极耳22在第二侧板12上的投影至少部分重叠(即第二转接件32垂直于第一侧板11的延伸方向的投影与第二极耳22垂直于第一侧板11的延伸方向的投影至少部 分重叠)，也就是说，第二转接件32和第二极耳22沿第一侧板的延伸方向排布，具体可以在电芯的宽度方向上排布，由此，便于第二转接件32与第二极耳22的连接，进一步节约腔体空间，提高电池的能量密度等性能。
此外，第一极耳21在第二侧板12上的投影与第二极耳22在第二侧板12上的投影至少部分重叠(即第一极耳21垂直于第一侧板11的延伸方向的投影与第二极耳22垂直于第一侧板11的延伸方向的投影至少部分重叠)。第一转接件31在第二侧板12上的投影与第二转接件32在第二侧板12上的投影至少部分重叠。
具体地，如图11所示，第一极耳21垂直于电芯2的宽度方向的投影与第二极耳22垂直于电芯2的宽度方向的投影至少部分重叠，第二转接件32垂直于电芯2的宽度方向的投影与第二极耳22垂直于电芯2的宽度方向的投影至少部分重叠。
此外，第一极耳21和第二极耳22可以位于第一转接件31和第二转接件32之间，从而充分利用第一转接件31和第二转接件32之间的空间，进一步扩大电芯2的电极片在长度方向上的尺寸，以提高电芯的能量密度。例如在平行于从第一转接件31至第一极耳21的方向上，第一极耳21和第二极耳22位于第一转接件31和第二转接件32之间，即第一转接件31、第一极耳21、第二极耳22、第二转接件32可以依次排布，例如，第一转接件31、第一极耳21、第二极耳22、第二转接件32可以在电芯2的宽度方向上依次排布，第一转接件31、第一极耳21、第二极耳22、第二转接件32可以基本同轴设置。
但不局限于此，在另一些实施例中，也可以是第一转接件31和第二转接件32位于第一极耳21和第二极耳22之间。
此外，第一转接件31、第一极耳21、第二极耳22、第二转接件32一般不伸出电芯2端面(电芯2面向第一侧板11的端面)的外缘，在电芯2的厚度方向或宽度方向上均不伸出电芯2的外缘，即电芯2在第一侧板11上的投影覆盖第一转接件31在第一侧板11上的投影，电芯2在第一侧板11上的投影覆盖第一极耳21在第一侧板11上的投影，电芯2在第一侧板11上的投影覆盖第二极耳22在第一侧板11上的投影，电芯2在第一侧板11上的投影覆盖第二转接件32在第一侧板11上的投影。
如图11所示，极柱42穿透第一侧板11与第二转接件连接。其中，极柱42一般是沿外接片41的厚度方向向外凸起形成，即极柱42的轴向平行于外接片41的厚度方向。
具体地，第一侧板11设有与极柱42对应设置的第五通孔110，极柱42通过第五通孔110，以实现穿透第一侧板11与第二转接件32连接。
此外，第二转接件32包括与极柱42对应设置的第三通孔320，极柱42穿透第一侧板11、并通过第三通孔320与第二转接件32相接，第五通孔110与第三通孔320可以同轴设置。
一般情况下，极柱42垂直于极柱42的轴向的横截面为圆形(图11)，或者，极柱为锥形结构，即沿远离外接片41的方向(从第一侧板11至第二转接件32的方向)，极柱42的直径呈增大或减小趋势，极柱42的直径即为极柱42垂直于极柱42的轴向的横截面的直径。
具体地，当极柱42为锥形结构时，沿从第一侧板11至第二转接件32的方向，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。第五通孔110、第三通孔320的孔径(直径)随极柱42的直径相应变化，例如，沿从第一侧板11至第二转接件32的方向，极柱42的直径逐渐增大，此时第五通孔110、第三通孔320的孔径也逐渐增大；沿从第一侧板11至第二转接件32的方向，极柱42的直径逐渐减小，此时第五通孔110、第三通孔320的孔径也逐渐减小。
在一些实施例中，第二转接件32的第三通孔320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；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外延部421。
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，第二孔段垂直于第三通孔320的轴向的投影可以覆盖第一孔段垂直于第三通孔320的轴向的投影。
此外，外接片41垂直于极柱42的轴向的横截面面积可以大于极柱42垂直于极柱42的轴向的横截面面积，外接片41垂直于极柱42的轴向的投影覆盖极柱42垂直于极柱42的轴向的投影，外延部421垂直于极柱42的横截面面积大于极柱42垂直于极柱42轴向的横截面面积，外延部421垂直于极柱 42的轴向的投影覆盖极柱42垂直于极柱42的轴向的投影，外接片41垂直于极柱42的轴向的横截面面积大于外延部421垂直于极柱42的轴向的横截面面积，外接片41垂直于极柱42的轴向的投影覆盖外延部421垂直于极柱42的轴向的投影，外延部421垂直于极柱42的轴向的横截面面积基本等于第二孔段垂直于极柱42的轴向的横截面面积，外延部421卡合在第二孔段，与第二孔段的侧壁相接。
极柱42靠近电芯2的一端面可以与第二转接件32靠近电芯2的一侧表面齐平，不仅可以保证极柱42和第二转接件32的结合强度，而且防止极柱42对第二极耳22或者第五连接片55与第二转接件32的连接造成干涉。具体地，外延部421沿第三通孔320的轴向(亦为极柱42的轴向)的厚度基本等于第二孔段沿第三通孔320的轴向的深度，由此，外延部421卡扣在第二孔段中，外延部421靠近电芯2的一端面与第二转接件32面向电芯2的一侧表面齐平。
此外，极柱42靠近电芯2的一端也可以伸出第三通孔320，并沿第三通孔320的周向向外延伸形成有与第二转接件32靠近电芯2的一侧表面相接的外延部421，即极柱42靠近电芯2的一端面不与第二转接件32面向电芯2的一侧表面齐平，而是位于第二转接件32与电芯2之间，此时，密封件9至电芯2的距离不大于极柱的外延部421至电芯2的距离。
其中，外接片、极柱42、外延部421可以一体成型，其可以是金属材质，具体实施时，可以使第二转接件32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外接片41，另一端形成外延部421，而其两端之间的部分形成极柱42，所形成的极柱42例如是锥形结构。
一般情况下，第二极耳22与壳体1绝缘，具体可以通过设置绝缘片(绝缘层)进行绝缘。在一些实施例中，如图11所示，外接片41与第一侧板11之间还设有第一绝缘片6，第二转接件32与第一侧板11之间还设有第二绝缘片7，即外接片41、第一绝缘片6、第一侧板11、第二绝缘片7、第二转接件32依次层叠设置，极柱42穿透第一绝缘片6和第二绝缘片7；极柱42与第一侧板11之间设有第一绝缘层81，由此，外接片41、极柱42、第二转接件32和第二极耳22电连接，而与第一侧板11(壳体1)绝缘连接。
其中，沿第三通孔320的周向，第三通孔320的孔径与极柱42的直径之差基本等于第一绝缘层81沿第三通孔320的周向的宽度，该第三通孔320的周向与第三通孔320的轴向垂直。具体地，第一绝缘层81可以与第一绝缘片6一体成型，第一绝缘层81由第一绝缘片6靠近第一侧板11的一侧向外凸起(向第二通孔110内凸起)形成；或者第一绝缘层81可以与第二绝缘片7一体成型，第一绝缘层81由第二绝缘片7靠近第一侧板11的一侧向外凸起(向第二通孔110内凸起)形成。
相应地，第一绝缘片6设有第六通孔60，极柱42穿过第六通孔60，以实现穿透第一绝缘片6；第二绝缘片7设有第四通孔70，极柱42穿过第四通孔70，以实现穿透第二绝缘片7。具体地，极柱42依次穿过第六通孔60、第五通孔110、第四通孔70、第三通孔320，以实现与第二转接件32连接。其中，第六通孔60、第五通孔110、第四通孔70、第三通孔320可以同轴设置。
第一绝缘片6在第一侧板11上的投影可以覆盖外接片41在第一侧板11上的投影(即外接片41在第一侧板11上的投影在第一绝缘片6在第一侧板11上的投影内)，从而防止外接片41与壳体1接触，保证壳体的绝缘。另外，第二绝缘片7在第一侧板11上的投影覆可以盖第二转接件32在第一侧板11上的投影(即第二转接件32在第一侧板11上的投影在第二绝缘片7在第一侧板11上的投影内)，从而防止第二转接件32与壳体1接触，保证壳体的绝缘性。由此，可以进一步提高电池安全性和稳定性等性能。
具体地，第二转接件32可以是块状(或称第二转接块)，其厚度方向可以平行于从第一侧板11至第二极耳22的方向，即第二转接件32在沿第一侧板11至第二极耳22的方向的长度为第二转接件32的厚度。
一般情况下，第一侧板11至第一极耳21的方向、第一侧板11至第二极耳22的方向、第一侧板11至电芯2的方向平行。
在一些实施例中，第二转接件32在沿第一侧板11至第二极耳22的方向的长度c2为1mm-3mm，例如1mm、1.5mm、2mm、2.5mm、3mm等。
一般第一极耳21与壳体1电连接，而第二极耳22与壳体1绝缘连接，第一转接件31与第一侧板11之间可以不设置绝缘片，二者直接接触，例如焊接，而在第二转接件32与第一侧板11之间可以设置第二绝缘片7，c2＜c1， 二者厚度之差(c1-c2)可以基本等于第二绝缘片7的厚度。
上述电池还可以包括位于电芯2与第一侧板11之间的第二连接件，第二连接件分别与第二极耳22和第二转接件32连接(即第二转接件32通过第二连接件与第二极耳22连接)，具体可以是第二转接件32、第二连接件、第二极耳22依次焊接。
具体地，第二连接件可以包括与第二转接件32连接的第五连接片55、与第二极耳22的背离电芯2的一侧相接的第八连接片58。
如图11所示，第二连接件可以具有弯折结构，第五连接片55与第二转接件32相接，第八连接片58与第二极耳22相接，具体可以是焊接，第二转接件32与第五连接片55相接的一面和第八连接片58与第二极耳22相接的一面之间形成有第三夹角，第三夹角的范围为80-120°，例如80°、90°、100°、110°、120°，即二者不平行，例如可以垂直，由此，可以进一步提高第二转接件32通过第二连接件与第二极耳22连接的稳定性，进而提高电池的稳定性、安全性和使用寿命等品质。
此外，第二转接件32与第五连接片55相接的一面和第二转接件32面向第一侧板11的一面之间形成有第四夹角，第四夹角的范围为80-120°，例如80°、90°、100°、110°、120°，即二者不平行，例如可以垂直。
此外，第五连接片55与第二转接件32相接的一面和电极片的表面平行。
在一些实施例中，如图11所示，第二连接件还包括分别与第五连接片55和第八连接片58连接起来的第二连接组件，第二连接组件包括第六连接片56和第七连接片57，第六连接片56位于第二转接件32与电芯2之间；在从第二转接件32至第二极耳22的方向上，第七连接片57位于第二转接件32和第二极耳22之间；第五连接片55、第六连接片56、第七连接片57、第八连接片58依次相连。
具体地，第二连接件具有多重弯折结构，其第五连接片55依次通过第六连接片56和第七连接片57与第八连接片58相接，第五连接片55的表面与第六连接片56的表面不平行，例如垂直，第六连接片56的表面与第七连接片57的表面不平行，可以垂直或不垂直，第八连接片58的表面与第六连接片56的表面可以平行，由此，可以进一步提高第二转接件32与第二极耳22连接的稳定性。
第五连接片55与第二转接件32可以是焊接，并在第五连接片55背离第二转接件32的一侧形成有焊印。具体地，第二转接件32在电芯2的厚度方向上的投影与第五连接片55在电芯2的厚度方向上的投影存在重叠区域，二者的焊接区域位于该重叠区域内。
此外，如图11所示，还可以包括第四绝缘层84，第四绝缘层84位于第二连接件和第一侧板11之间。具体地，第四绝缘层84可以包括位于第八连接片58背离第二极耳22的一面的第四部分。
在一些实施例中，第四绝缘层84还包括自第四部分靠近电芯2的第一面的一端向靠近电芯2的方向延伸形成的第五部分以及自第四部分靠近电芯2的第二面的一端向靠近电芯2的方向延伸形成的第六部分。
如图11所示，第四绝缘层84的第五部分、第四部分和第六部分依次相连，并围设成第二凹槽，第二凹槽的底壁为第四绝缘层84的第四部分，侧壁分别为第四绝缘层84的第五部分和第六部分，第二极耳22、以及第二连接件与第二极耳22相接的部分(如第八连接片58、第五连接片55位于第二极耳22侧面的第四连接部552)位于第二凹槽内，被第四绝缘层84覆盖，由此，可进一步提高电池的稳定性和安全性等性能。
具体来说，第二极耳22具有相对的第一侧面和第二侧面，第二极耳22的第一侧面与第二极耳22的第二侧面分别位于第二极耳22与第八连接片58相接的一面的相对两侧。第四绝缘层84包括位于第八连接片58背离第二极耳22的一面的第四部分、位于第二极耳22的第一侧面的第五部分、位于第二极耳22的第二侧面的第六部分。
在一些实施例中，第二极耳22在电芯2的厚度方向上的投影位于第四绝缘层84的第五部分在电芯2的厚度方向上的投影内，第二极耳22在电芯2的厚度方向上的投影位于第四绝缘层84的第六部分在电芯2的厚度方向上的投影内，第二极耳22在电芯2的长度方向上的投影位于第四绝缘层84的第四部分在电芯2的长度方向上的投影内，即第四绝缘层84完全覆盖第二极耳22以及第二连接件与第二极耳22相接的部分。其中，第五部分至第二极耳22的方向、第六部分至第二极耳22的方向、第五部分至第六部分的方向、电芯2的厚度方向可以平行，第四部分至第二极耳22的方向与电芯2的长度方向平行。
在一些优选实施例中，第四绝缘层84的第五部分延伸至电芯2的第一面并与位于电芯2的第一面的电极片粘接，第四绝缘层84的第六部分延伸至电芯2的第二面并与位于电芯2的第二面的电极片粘接，由此，第四绝缘层84包裹在电芯2的侧面，可以进一步提高电芯2的稳定性。
如图11所示，第二连接件与电芯2之间还可以设有第五绝缘层85，第五绝缘层85具体可以位于第六连接片56与电芯2之间，以避免第二连接件与电芯2中极性相反的电极片接触短路。
在一些实施例中，第五绝缘层85延伸至电芯2的第一面并与位于电芯2的第一面的电极片粘接，第五绝缘层85延伸至电芯2的第二面并与位于电芯2的第二面的电极片粘接，这样，第五绝缘层85包裹在电芯2的侧面，还能够固定电芯2，提高电芯2的稳定性。
本发明实施例中，位于电芯2的第一面的电极片、位于电芯2的第二面的电极片分别是电芯2最外侧的电极片，即其余电极片层叠设置在位于电芯2的第一面的电极片与位于电芯2的第二面的电极片之间。位于电芯2的第一面的电极片与位于电芯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，可以为第一电极片或第二电极片，通常优选位于电芯2的第一面的电极片与位于电芯2的第二面的电极片为负极片。
此外，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。
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。
此外，第一转接件31的材质、第一连接件的材质、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，第一转接件31的材质、第一连接件的材质、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。第二转接件32的材质、第二连接件的材质、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，第二转接件32 的材质、第二连接件的材质、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。
此外，本发明实施例的电池具体可以包括锂离子电池，但不局限于此。
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。

Claims (31)

  1. 一种电池，其特征在于，包括：
    壳体，围设成腔体；所述壳体设有与所述腔体连通的第一通孔；
    密封件，设于所述腔体内，用于在自然状态时密封所述第一通孔、在受力状态时远离所述第一通孔。
  2. 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电芯，所述密封件与所述电芯的距离大于0。
  3. 根据权利要求1或2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电芯，所述密封件与所述电芯之间设有第二绝缘层。
  4. 根据权利要求1所述的电池，其特征在于，所述壳体包括第一侧板，所述第一通孔设于所述第一侧板；所述密封件包括与所述第一侧板连接的连接部、以及与所述连接部连接的密封部。
  5. 根据权利要求4所述的电池，其特征在于，
    所述连接部包括与所述密封部连接的第一连接区、以及位于所述第一连接区的相对两侧的第三连接区，所述第三连接区与所述第一侧板连接。
  6. 根据权利要求4所述的电池，其特征在于，所述连接部与所述第一侧板连接的一面平行于所述连接部与所述密封部连接的一面。
  7. 根据权利要求4所述的电池，其特征在于，
    所述连接部与所述第一侧板焊接；
    或者，所述连接部与所述第一侧板通过垫片连接。
  8. 根据权利要求4所述的电池，其特征在于，所述电池还包括设于所述第一侧板与所述密封件之间的第一转接件，所述第一转接件设有与所述第一通孔连通的第二通孔，所述连接部与所述第一转接件连接。
  9. 根据权利要求8所述的电池，其特征在于，所述第一转接件背离所述第一侧板的一侧设有与所述第二通孔连通的第一凹槽，所述密封件设于所述第一凹槽内。
  10. 根据权利要求8或9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电芯，所述电芯设有第一极耳，所述第一转接件与所述第一极耳电连接。
  11. 根据权利要求10所述的电池，其特征在于，所述电池还包括位于所 述腔体内的第一连接件，所述第一连接件分别与所述第一极耳和所述第一转接件连接。
  12. 根据权利要求11所述的电池，其特征在于，所述第一转接件包括相连的第一转接部和第二转接部，所述第二通孔设于所述第一转接部，其中，
    所述第一连接件与所述第二转接部连接；
    和/或，所述第一转接部分别与所述第一侧板、所述连接部连接。
  13. 根据权利要求5所述的电池，其特征在于，沿所述第一连接区至所述第三连接区的方向平行于所述第一侧板的长度方向。
  14. 根据权利要求5所述的电池，其特征在于，
    所述连接部为弧形结构；
    或者，所述连接部还包括连接所述第一连接区和所述第三连接区的第二连接区，其中，
    在所述自然状态下，所述第一连接区、所述第二连接区、所述第三连接区的表面齐平；
    或者，所述第二连接区包括至少一个弧形段，
    或者，所述第二连接区包括至少两个连接段，其中每相邻的两个连接段之间形成夹角。
  15. 根据权利要求14所述的电池，其特征在于，
    所述第二连接区包括一个弧形段，该弧形段的凹面为其面向所述第一侧板的一面；
    或者，所述第二连接区包括至少两个弧形段，其中每相邻的两个弧形段中的一者的凹面与另一者的凹面分别位于所述第二连接区的相对两侧。
  16. 根据权利要求15所述的电池，其特征在于，
    所述至少两个弧形段的分布方向平行于沿所述第一侧板至所述密封件的方向；
    或者，所述至少两个弧形段的分布方向垂直于沿所述第一侧板至所述密封件的方向。
  17. 根据权利要求14所述的电池，其特征在于，
    所述至少两个连接段的分布方向平行于沿所述第一侧板至所述密封件的方向；
    或者，所述至少两个连接段的分布方向垂直于沿所述第一侧板至所述密封件的方向。
  18. 根据权利要求4或5所述的电池，其特征在于，
    所述密封部在所述第一侧板上的投影覆盖所述第一通孔。
  19. 根据权利要求8或9所述的电池，其特征在于，
    所述密封部在所述第一侧板上的投影覆盖所述第二通孔。
  20. 根据权利要求4或5所述的电池，其特征在于，
    所述密封部面向所述第一通孔的一面为平面或曲面；
    和/或，所述密封部为多边型、圆柱型、半球型或球型。
  21. 根据权利要求4或5所述的电池，其特征在于，所述密封部至少部分延伸至所述第一通孔内。
  22. 根据权利要求8或9所述的电池，其特征在于，所述密封部至少部分延伸至所述第二通孔内。
  23. 根据权利要求4所述的电池，其特征在于，
    所述密封部与所述连接部一体成型；
    或者，所述密封部与所述连接部粘接。
  24. 根据权利要求4或23所述的电池，其特征在于，所述连接部面向所述密封部的一侧设有第二凹槽，所述密封部部分嵌入所述第二凹槽内。
  25. 根据权利要求4所述的电池，其特征在于，
    所述密封部为金属或非金属材质；
    和/或，所述连接部为金属或非金属材质。
  26. 根据权利要求4或25所述的电池，其特征在于，所述密封部为柔性材质。
  27. 根据权利要求26所述的电池，其特征在于，所述密封部为橡胶材质或塑料材质。
  28. 根据权利要求27所述的电池，其特征在于，所述塑料材质为PET塑料材质。
  29. 根据权利要求4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电芯，所述电芯设有第二极耳；
    所述电池还包括转接组件，所述转接组件包括位于所述腔体内的第二转 接件、以及位于所述第一侧板背离所述腔体的一侧的外接片，所述外接片包括向外凸起形成极柱，所述极柱穿透所述第一侧板与所述第二转接件、第二极耳连接。
  30. 根据权利要求29所述的电池，其特征在于，所述密封件至所述电芯的距离不大于所述转接组件至所述电芯的距离。
  31. 根据权利要求1所述的电池，其特征在于，所述电池还包括密封所述第一通孔的封口片，所述封口片位于所述壳体背离所述腔体的一侧。
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CN214254576U (zh) * 2021-01-07 2021-09-21 宁德时代新能源科技股份有限公司 端盖组件、电池单体、电池及用电装置
CN114039137A (zh) * 2021-10-18 2022-02-11 欣旺达电动汽车电池有限公司 一种顶盖组件及电池
CN114421038A (zh) * 2022-03-30 2022-04-29 宁德新能源科技有限公司 电芯密封组件、电池、用电设备及电芯密封方法
CN114883762A (zh) * 2022-06-02 2022-08-09 珠海冠宇电池股份有限公司 电池

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