WO2021196028A1 - 电池 - Google Patents

电池 Download PDF

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Publication number
WO2021196028A1
WO2021196028A1 PCT/CN2020/082592 CN2020082592W WO2021196028A1 WO 2021196028 A1 WO2021196028 A1 WO 2021196028A1 CN 2020082592 W CN2020082592 W CN 2020082592W WO 2021196028 A1 WO2021196028 A1 WO 2021196028A1
Authority
WO
WIPO (PCT)
Prior art keywords
insulating layer
battery
area
electrode assembly
distance
Prior art date
Application number
PCT/CN2020/082592
Other languages
English (en)
French (fr)
Inventor
董宇洋
闫东阳
曾巧
Original Assignee
宁德新能源科技有限公司
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 宁德新能源科技有限公司 filed Critical 宁德新能源科技有限公司
Priority to PCT/CN2020/082592 priority Critical patent/WO2021196028A1/zh
Priority to PCT/CN2020/130646 priority patent/WO2021196665A1/zh
Priority to EP20929099.8A priority patent/EP4131528A4/en
Priority to JP2022517503A priority patent/JP7565346B2/ja
Publication of WO2021196028A1 publication Critical patent/WO2021196028A1/zh
Priority to US17/957,223 priority patent/US20230037223A1/en
Priority to JP2024171072A priority patent/JP2025004079A/ja

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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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/14—Primary casings; Jackets or wrappings for protecting against damage caused by external factors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0436—Small-sized flat cells or batteries for portable equipment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • H01M50/126—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
    • H01M50/133—Thickness
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • 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

  • This application relates to a battery.
  • This application provides a battery, including:
  • the electrode assembly includes a first surface and a second surface arranged opposite to the first surface;
  • the first insulating layer is disposed on the first surface
  • the second insulating layer is disposed on the first surface and is spaced apart from the first insulating layer along a first direction;
  • the first bonding part wherein the first bonding part is disposed on the first surface and located in the area between the first insulating layer and the second insulating layer.
  • the area of the orthographic projection of the first bonding portion on the first surface is smaller than the total area of the orthographic projection of the first insulating layer and the second insulating layer on the first surface.
  • the area of the orthographic projection of the first bonding portion on the first surface is smaller than the area of the orthographic projection of the first insulating layer on the first surface, and smaller than the area of the orthographic projection of the second insulating layer on the first surface.
  • the area of the orthographic projection of the surface is smaller than the area of the orthographic projection of the first insulating layer on the first surface, and smaller than the area of the orthographic projection of the second insulating layer on the first surface.
  • the distance from the part of the area where the first surface overlaps the first insulating layer to the second surface is the first distance, and the first adhesive portion is to The distance of the second surface is the second distance, and the first distance is smaller than the second distance.
  • the first distance is the distance from the end of the first surface corresponding to the first insulating layer to the second surface.
  • the distance from the part of the area where the first surface overlaps the second insulating layer to the second surface is a third distance, and the third distance is smaller than the second surface. distance.
  • the third distance is the distance from the corresponding end of the first surface and the second insulating layer to the second surface.
  • the first distance and the third distance are not equal.
  • the length of the first bonding portion in the first direction is less than half of the length of the first surface in the first direction.
  • the first surface is provided with a first groove corresponding to the first adhesive part, and the first adhesive part is located in the first groove.
  • each first bonding part is located in a first groove.
  • the battery further includes a second adhesive part, the second adhesive part is provided on the surface of the first insulating layer away from the second surface, and the area of the orthographic projection of the second adhesive part on the first surface It is smaller than the area of the orthographic projection of the first insulating layer on the first surface.
  • the first bonding portions are distributed in a dot matrix, and/or the second bonding portions are distributed in a dot matrix.
  • the surface of the first insulating layer corresponding to the second bonding portion is provided with second grooves, and each second bonding portion is located in the second groove.
  • the electrode assembly further includes a connection area connecting the first surface and the second surface, the first insulating layer extends from the first surface to the connection area, and the second insulating layer extends from the first surface to the connection area.
  • the first insulating layer and the second insulating layer are located on the same side of the electrode assembly.
  • the electrode assembly further includes a metal part
  • the connection area includes a first part and a second part opposite to the first part
  • the metal part is provided in the first part
  • the first insulating layer and the second insulating layer extend to the first part. Two parts.
  • the battery further includes a third adhesive part, the third adhesive part is arranged on the surface of the first insulating layer away from the second surface, and extends to an area where the first insulating layer is not provided on the first surface.
  • the battery further includes a fourth adhesive portion, the fourth adhesive portion is provided on the first surface, and the area where the fourth adhesive portion is provided on the first surface is connected to the first surface.
  • the area provided with the first insulating layer and the second insulating layer and the area where the first surface is located between the first insulating layer and the second insulating layer are separated, and the fourth adhesive part is not insulated from the first insulating layer The layer is in contact with the second insulating layer.
  • the electrode assembly viewed from a direction perpendicular to the first surface, the electrode assembly includes at least two fourth bonding portions with different shapes.
  • the electrode assembly further includes a third insulating layer, the electrode assembly has a winding structure, and the third insulating layer is disposed on the second surface and fixes the end of the outermost pole piece of the electrode assembly.
  • the battery further includes a casing, which wraps the electrode assembly, the first insulating layer and the second insulating layer, and is bonded to the electrode assembly through the first bonding portion.
  • a first insulating layer and a second insulating layer are provided on the surface of the electrode assembly, and a first adhesive part is provided between the first insulating layer and the second insulating layer.
  • a bonding part bonds the electrode assembly and the casing, and when the battery receives an external force, it is beneficial to improve the safety of the battery and prolong the service life of the battery.
  • FIG. 1 is a schematic diagram of the structure of a battery according to an embodiment of the application.
  • Fig. 2 is a side view of a battery according to an embodiment of the application.
  • FIG. 3 is a schematic diagram of the structure of a stacked body according to an embodiment of the application.
  • FIG. 4 is a schematic diagram of the structure of the first conductive layer according to an embodiment of the application.
  • FIG. 5 is a schematic diagram of the structure of the second conductive layer according to an embodiment of the application.
  • FIG. 6 is a schematic diagram of the structure of an electrode assembly according to an embodiment of the application.
  • FIG. 7 is a schematic diagram of the structure of an electrode assembly according to an embodiment of the application.
  • FIG. 8 is a schematic diagram of the structure of a battery according to an embodiment of the application.
  • Fig. 9 is a front view of a battery according to an embodiment of the application.
  • FIG. 10 is a schematic cross-sectional view of a battery along a first direction according to an embodiment of the application.
  • FIG. 11 is a schematic cross-sectional view of a battery along a second direction according to an embodiment of the application.
  • FIG. 12 is a schematic cross-sectional view of a battery according to an embodiment of the application along the first direction.
  • FIG. 13 is a schematic cross-sectional view of a battery according to an embodiment of the application along the first direction.
  • FIG. 14 is a schematic diagram of the structure of the first bonding portion or the fourth bonding portion according to an embodiment of the application.
  • 15 is a schematic diagram of the structure of the first bonding part or the fourth bonding part according to an embodiment of the application.
  • FIG. 16 is a schematic diagram of the structure of the first bonding portion or the fourth bonding portion according to an embodiment of the application.
  • FIG. 17 is a schematic diagram of the structure of the first bonding portion or the fourth bonding portion according to an embodiment of the application.
  • FIG. 18 is a schematic structural diagram of a battery according to an embodiment of the application.
  • FIG. 19 is a schematic diagram of a partial disassembly of a battery according to an embodiment of the application.
  • FIG. 20 is a schematic partial cross-sectional view of a battery along a second direction according to an embodiment of the application.
  • FIG. 21 is a schematic partial cross-sectional view of a battery along a second direction according to an embodiment of the application.
  • Fig. 22 is a side view of a battery according to an embodiment of the application.
  • Fig. 23 is a rear view of a battery according to an embodiment of the application.
  • Fig. 24 is a bottom view of a battery according to an embodiment of the application.
  • FIG. 25 is a schematic diagram of the structure of a battery according to an embodiment of the application.
  • FIG. 26 is a schematic diagram of the structure of a battery according to an embodiment of the application.
  • Fig. 27 is a bottom view of a battery according to an embodiment of the application.
  • FIG. 28 is a schematic diagram of a part of the structure of the battery of Comparative Example 2 in this application.
  • FIG. 29 is a schematic diagram of a part of the structure of the battery of Comparative Example 3 in this application.
  • FIG. 30 is a schematic diagram of a part of the structure of the battery of Example 1 in this application.
  • FIG. 31 is a schematic diagram of a part of the structure of the battery of Example 2 in this application.
  • FIG. 32 is a schematic diagram of a part of the structure of the battery of Example 3 in this application.
  • FIG. 33 is a schematic diagram of a part of the structure of the battery of Example 4 in this application.
  • FIG. 34 is a schematic diagram of the structure of a battery according to an embodiment of the application.
  • spatially related terms such as “on”, etc. may be used herein for convenience of description to describe the relationship between one element or feature and another element (multiple elements) or feature (multiple features) as illustrated in the figure. It should be understood that, in addition to the directions described in the figures, spatially related terms are intended to include different directions in use or operation of equipment or devices. For example, if the device in the figure is turned over, elements described as “above” or “above” other elements or features will be oriented “below” or “below” other elements or features. Therefore, the exemplary term “upper” may include directions of above and below. It should be understood that although the terms first, second, third, etc.
  • the battery 100 includes an electrode assembly 10, a first insulating layer 20, a second insulating layer 30 and a first bonding part 40.
  • the electrode assembly 10 includes a first surface 101, a second surface 103 disposed opposite to the first surface 101, and a connection area 105 connecting the first surface 101 and the second surface 103.
  • the electrode assembly 10 includes a pole piece 11 and an isolation film (not shown), and the pole piece 11 and the isolation film are wound to form a winding structure.
  • the first surface 101, the second surface 103 and the connection area 105 serve as a part of the outer surface of the electrode assembly 10.
  • the electrode assembly 10 is formed by multiple windings.
  • the electrode assembly 10 has multiple bending parts in one direction, that is, the X direction in the figure, and the multiple bending parts are respectively distributed in
  • the opposite sides of the center of the battery 100 along the X direction, in FIG. 1, are the left and right sides, respectively.
  • an outer plane of the electrode assembly 10 is connected to the end of the outermost bent portion on the left side of the center of the battery 100 that is closest to the center of the battery 100 at the first end 101A.
  • the outer plane of the electrode assembly 10 is on the right side of the center of the battery 100
  • the second end 101B is connected to the end of the outermost bent portion on the side closest to the center of the battery 100.
  • the first surface 101 is, for example, when viewed in the Z direction shown in FIG. 1, the first end 101A, the second end 101B, and the two ends of the electrode assembly 10 in the Y direction, namely the first side 16 And the area enclosed by the second side 18.
  • the electrode assembly 10 includes four edges perpendicular to the Z direction, and the area enclosed by the four edges is the second surface 103.
  • the electrode assembly 10 will be further described with an example below.
  • the battery assembly 10 may include: a first conductive layer 10A, a first isolation layer 10B, a second conductive layer 10C, and a second isolation layer 10D.
  • the first isolation layer 10B is formed on the surface 10a of the first conductive layer 10A.
  • the second conductive layer 10C is formed on the surface 10b of the first isolation layer 10B away from the first conductive layer 10A.
  • the second isolation layer 10D is formed on the surface 10c of the second conductive layer 10C away from the first isolation layer 10B.
  • a stacked body 10E can be formed, and the electrode assembly 10 can be formed on the basis of the stacked body 10E.
  • the first conductive layer 10A may be rectangular.
  • the first conductive layer 10A may be formed by stacking the current collector 10AA and the active material layer 10AB on each other.
  • the current collector 10AA may at least include but is not limited to one or more of conductive metal sheets such as aluminum mesh and aluminum foil.
  • the active material layer 10AB may at least include, but is not limited to, lithium cobalt oxide, lithium nickel cobalt manganate, lithium nickel cobalt aluminate, lithium manganate, lithium nickelate, lithium iron manganese phosphate, lithium vanadium phosphate, lithium vanadyl phosphate , One or more of lithium iron phosphate, lithium titanate and lithium-rich manganese-based materials.
  • the first conductive layer 10A for example, can be used as a positive pole piece when composing the electrode assembly 10 of the battery 100.
  • the first isolation layer 10B when viewed from a direction perpendicular to the surface 10b, may be rectangular.
  • the first isolation layer 10B may include, but is not limited to, at least one or more of polyethylene, polypropylene, polyethylene terephthalate, polyimide, and aramid.
  • the first separation layer 10B for example, can serve as a separation film when composing the electrode assembly 10 of the battery 100.
  • the second conductive layer 10C may be rectangular when viewed from a direction perpendicular to the surface 10c.
  • the second conductive layer 10C may be formed by stacking the current collector 10CA and the active material layer 10CB on each other.
  • the current collector 10CA may include, but is not limited to, at least one or two of conductive metal sheets such as nickel foil and copper foil.
  • the active material layer 10CB may include at least but not limited to graphite, soft carbon, hard carbon, graphene, mesophase carbon microspheres, silicon-based materials, tin-based materials, lithium titanate or other metals that can form alloys with lithium One or more of.
  • the second conductive layer 10C for example, can serve as a negative electrode piece when composing the electrode assembly 10 of the battery 100.
  • the second isolation layer 10D may have a rectangular shape.
  • the second isolation layer 10D may include, but is not limited to, at least one or more of polyethylene, polypropylene, polyethylene terephthalate, polyimide, and aramid.
  • the second separation layer 10D can serve as a separation film when composing the electrode assembly 10 of the battery 100.
  • the electrode assembly 10 may be formed by winding a stack 10Ea formed by stacking a plurality of stacks 10E, for example. Or, for example, referring to Fig. 7, the electrode assembly 10 can be formed by directly stacking a plurality of stacked bodies 10E.
  • the outer surface of the electrode assembly 10 includes a first surface 101 and a second surface 103 facing away from the first surface 101.
  • the outer surface of the electrode assembly 10 also includes a connection area 105 in the third direction Z perpendicular to the first surface 101.
  • the second surface 103 is, for example, when viewed in the Z direction shown in FIG. 10
  • the two ends along the Y direction that is, the area corresponding to the area enclosed by the first side 16 and the second side 18.
  • connection area 105 includes a first portion 106 and a second portion 107 opposite to the first portion 106.
  • the electrode assembly 10 may further include a metal part 15, and the metal part 15 is disposed on the first part 106.
  • One end of the metal portion 15 is connected to the pole piece 11, and the other end can be connected to other electronic components to realize the electrical conduction between the electrode assembly 10 and other electronic components.
  • the first insulating layer 20 and the second insulating layer 30 are both disposed on the first surface 101, and the first insulating layer 20 and the second insulating layer 30 are spaced along a first direction X.
  • the first insulating layer 20 may, for example, be rectangular.
  • the first insulating layer 20, for example, may at least include, but is not limited to, one or more of polyimide, polyvinyl chloride, polyethylene, and polypropylene.
  • the second insulating layer 30, for example, may be rectangular.
  • the second insulating layer 30, for example, may at least include, but is not limited to, one or more of polyimide, polyvinyl chloride, polyethylene, and polypropylene.
  • the first surface 101 and the second portion 107 intersect at the first side 16.
  • the first direction X is the direction in which the first side 16 is located.
  • the first insulating layer 20 and the second insulating layer 30 respectively extend from the first side 16 along the first surface 101 toward the first portion 106 and do not reach the first portion 106.
  • the length L1 of the first insulating layer 20 extending from the first side 16 toward the first portion 106 and the length L2 of the second insulating layer 30 extending from the first side 16 toward the first portion 106 are not as far as the first portion 106 and the first insulating layer 20.
  • the second insulating layer 30 does not reach the first portion 106, it is not particularly limited.
  • the length L1 of the first insulating layer 20 extending from the first side 16 toward the first portion 106 is equal to the length L2 of the second insulating layer 30 extending from the first side 16 toward the first portion 106.
  • the above-mentioned longitudinal direction is defined as the second direction Y.
  • the first insulating layer 20 and the second insulating layer 30 may respectively include a glue layer and a base material that are laminated, wherein the glue layer adheres the base material and the electrode assembly 10.
  • the adhesive layer may include, but is not limited to, at least one or more of natural rubber, synthetic rubber, acrylic, silica gel, and ethylene-vinyl acetate.
  • the substrate for example, may include but is not limited to at least one or more of polyethylene, polypropylene, Teflon, polyvinyl chloride, polyimide, and non-woven fabric.
  • the first adhesive portion 40 when viewed from a third direction Z perpendicular to the first surface 101, the first adhesive portion 40 is disposed on the first surface 101 and located on the first insulating layer 20 and the second insulating layer 20. The area 101a between the insulating layers 30. In the second direction Y, the first adhesive portion 40 does not extend beyond the first insulating layer 20 and the second insulating layer 30. In some embodiments, the length of the above-mentioned region 101a in the first direction X may be less than half of the length of the first surface 101 in the first direction X.
  • the area of the orthographic projection of the first bonding portion 40 on the first surface 101 in other words, the first bonding portion 40 is on the first surface 101 along the third direction Z perpendicular to the first surface 101
  • the projected area may be smaller than the total area of the orthographic projection of the first insulating layer 20 and the second insulating layer 30 on the first surface 101.
  • the area of the orthographic projection of the first bonding portion 40 on the first surface 101 may be smaller than the area of the orthographic projection of the first insulating layer 20 on the first surface 101, and at the same time, it may be smaller than the area of the orthographic projection of the first insulating layer 20 on the first surface 101.
  • the first bonding part 40 may include, but is not limited to, at least cellulose, polyvinylidene fluoride-co-hexafluoropropylene, polyvinylidene fluoride-co-trichloroethylene, polymethyl methacrylate, polybutylene acrylate Ester, polyacrylonitrile, polyvinylpyrrolidone, polyvinyl acetate, polyethylene-co-vinyl acetate, polyethylene oxide, polyarylate, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, A polymer of cyanoethyl pullulan, cyanoethyl polyvinyl alcohol, cyanoethyl cellulose, cyanoethyl sucrose, pullulan, carboxymethyl cellulose, and polypropylene-maleic anhydride or A mixture of any combination of the above-mentioned polymers.
  • the first distance H1 from at least a part of the area where the first surface 101 overlaps the first insulating layer 20 to the second surface 103 is smaller than the second distance H2 from the first bonding portion 40 to the second surface 103.
  • the distance from the second surface 103 at different positions in at least a part of the area where the first surface 101 overlaps the first insulating layer 20 may be different. Further, referring to FIGS.
  • At least a part of the area where the first side 16 overlaps the first insulating layer 20 refers to the end of the first surface 101 corresponding to the first insulating layer 20,
  • the first distance H1 from the second surface 103 is smaller than the second distance H2 from the first bonding portion 40 to the second surface 103.
  • a first recess 120 is provided on the first surface 101, and the first recess 120 is provided from the first side 16 toward the first portion 106. At least a portion of the first insulating layer 20 away from the first portion 106 is disposed in the first recess 120.
  • the first recess 120 may be an inclined groove, the depth of which gradually decreases from the first side 16 along the second direction Y toward the first portion 106. The portion of the first insulating layer 20 close to the first portion 106 may be located outside the first recess 120.
  • the third distance H3 from at least a part of the overlapping area of the first surface 101 and the second insulating layer 30 to the second surface 103 is smaller than the second distance H2.
  • the distance from the second surface 103 at different positions in at least a part of the overlapping area of the first surface 101 and the second insulating layer 20 may be different.
  • at least a part of the area where the first side 16 overlaps the second insulating layer 30 refers to the end of the first surface 101 and the second insulating layer 30 where the third distance H3 from the second surface 103 is less than The second distance H2.
  • a second recess 130 is provided on the first surface 101, and the second recess 130 is disposed from the first side 16 toward the first portion 106. At least a part of the second insulating layer 30 away from the first part 106 is disposed in the second recess 130.
  • the second recess 130 may be an inclined groove, the depth of which gradually decreases from the first side 16 along the second direction Y toward the first portion 106. The portion of the second insulating layer 30 that is close to the first portion 106 may be located outside the second recess 130.
  • the first distance H1 and the third distance H3 may not be equal.
  • the first surface 101 may be provided with a first groove 140, and the first bonding portion 40 is located in the first groove 140.
  • the number of the first adhesive portion 40 is multiple, the number of the first groove 140 is multiple, and each first adhesive portion 40 is located in one first groove 140.
  • the shape of the first bonding portion 40 is not limited, and can be circular (refer to Figure 9), rectangular (refer to Figures 14 and 15), and strip-shaped (refer to Figure 16) , Other regular or irregular shapes or a combination of these graphics.
  • the number of the first bonding portion 40 can also be set according to actual needs, and it is one or more. When the number of the first bonding parts 40 is multiple, the plurality of first bonding parts 40 are arranged at intervals (for example, distributed in a lattice).
  • the battery 100 may include at least two different shapes.
  • the first bonding part 40 please refer to FIG. 17).
  • the shapes of all the first bonding portions 40 may also be the same.
  • the battery 100 may further include a casing 80.
  • the shell 80 for example, may be, but not limited to, one or more of aluminum plastic film, heat shrinkable film, aluminum shell, and steel shell.
  • the case 80 wraps the electrode assembly 10, the first insulating layer 20 and the second insulating layer 30, and is bonded to the electrode assembly 10 through the first bonding portion 40 (see also FIG. 20).
  • the first adhesive portion 40 is provided in the area 101a of the first insulating layer 20 and the second insulating layer 30, so that the area where the first insulating layer 20 and the second insulating layer 30 are provided in the battery 100 and the area corresponding to the area 101a in the battery During the formation process, the region is compressed more uniformly in the horizontal direction, that is, along the first direction X and the second direction Y, which is beneficial to reduce the degree of deformation of the battery 100 during use. Disposing the first adhesive portion 40 between the first insulating layer 20 and the second insulating layer 30 can increase the adhesive force between the electrode assembly 10 and the case 80, so that the electrode assembly 10 can be restrained when the battery 100 is subjected to an external force.
  • the relative displacement between the battery and the housing 80 further reduces the possibility of damage to the battery 100 due to external forces and prolongs the service life of the battery 100.
  • the first adhesive portion 40 adheres the case 80 and the electrode assembly 10, it also helps to suppress the deformation of the electrode assembly 10.
  • the shape of the first bonding portion 40 after the housing 80 is bonded may be changed.
  • the plurality of first bonding parts 40 may be arranged at intervals, or adjacent first bonding parts 40 may be arranged at intervals.
  • a bonding part 40 is connected to each other (please refer to FIG. 16).
  • the battery 100 may further include a second bonding portion 50, and the second bonding portion 50 is disposed on the surface 21 of the first insulating layer 20 away from the second surface 103.
  • the area of the orthographic projection of the second bonding portion 50 on the first surface 101 is smaller than the area of the orthographic projection of the first insulating layer 20 on the first surface 101.
  • the surface 31 of the second insulating layer 30 away from the second surface 103 can also be provided with a second bonding portion 50.
  • the area of the orthographic projection of the second bonding portion 50 on the first surface 101 is smaller than that of the second insulating layer 30 on the first surface.
  • the area of the orthographic projection of a surface 101 is smaller than that of the second insulating layer 30 on the first surface.
  • the second bonding part 50 may at least include but not limited to cellulose, polyvinylidene fluoride-co-hexafluoropropylene, polyvinylidene fluoride-co-trichloroethylene, polymethyl methacrylate, polybutylene acrylate Ester, polyacrylonitrile, polyvinylpyrrolidone, polyvinyl acetate, polyethylene-co-vinyl acetate, polyethylene oxide, polyarylate, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, A polymer of cyanoethyl pullulan, cyanoethyl polyvinyl alcohol, cyanoethyl cellulose, cyanoethyl sucrose, pullulan, carboxymethyl cellulose, and polypropylene-maleic anhydride or A mixture of any combination of the above-mentioned polymers.
  • the shape of the second bonding portion 50 is not limited, and may be a circle, a rectangle, a strip, other regular or irregular shapes, or a combination of these graphics.
  • the number of the second bonding portion 50 can also be set according to actual needs, and it is one or more.
  • the plurality of second bonding parts 50 are arranged at intervals (for example, distributed in a lattice).
  • the battery 100 may include at least two different shapes.
  • the second bonding part 50 when viewed from the third direction Z, the shapes of all the second bonding portions 50 may also be the same.
  • the surface of the first insulating layer 20 facing away from the second surface 103 is provided with a second groove 150, and the second bonding portion 50 is located in the second groove 150.
  • the housing 80 is bonded to the first insulating layer 20 through the second bonding portion 50.
  • the housing 80 can also be bonded to the second insulating layer 30 through the second bonding part 50.
  • the housing 80 can also adhere the first insulating layer 20 and the second insulating layer 30 through the second adhesive part 50.
  • the plurality of second bonding parts 50 can be arranged at intervals, or adjacent first The two bonding parts 50 are connected to each other.
  • the battery 100 may further include a third adhesive part 60, the third adhesive part 60 is disposed on the surface 21 of the first insulating layer 20 away from the second surface 103 and straddles the first insulating layer 20. The interface between the layer 20 and the first surface 101 extends to the first surface 101.
  • the third bonding part 60 may include, but is not limited to, at least cellulose, polyvinylidene fluoride-co-hexafluoropropylene, polyvinylidene fluoride-co-trichloroethylene, polymethyl methacrylate, polybutylene acrylate Ester, polyacrylonitrile, polyvinylpyrrolidone, polyvinyl acetate, polyethylene-co-vinyl acetate, polyethylene oxide, polyarylate, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, A polymer of cyanoethyl pullulan, cyanoethyl polyvinyl alcohol, cyanoethyl cellulose, cyanoethyl sucrose, pullulan, carboxymethyl cellulose, and polypropylene-maleic anhydride or A mixture of any combination of the above-mentioned polymers.
  • the third bonding part 60 adheres to the housing 80.
  • the housing 80 can be bonded to the first insulating layer 20 through the third bonding portion 60.
  • the housing 80 can also be bonded to the second insulating layer 30 through the third bonding part 60.
  • the housing 80 can also simultaneously bond the first insulation layer 20 and the second insulation layer 30 through the third bonding portion 60.
  • the battery 100 may further include a fourth bonding portion 70, and the fourth bonding portion 70 is disposed on the area 101 b of the first surface 101.
  • the area 101b is spaced from the area where the first insulating layer 20 and the second insulating layer 30 are provided on the first surface 101 and the area 101a in the first surface 101, and the fourth bonding portion 70 is not separated from the first insulating layer 20 and the second insulating layer 20 and the second insulating layer.
  • the insulating layer 30 is in contact.
  • the area 101b includes a first block 101b1 and a second block 101b2.
  • the first block 101b1 is away from the area 101a in the second direction Y.
  • the second block 101b2 is located on the side of the first insulating layer 20 away from the second insulating layer 30 and the side of the second insulating layer 30 away from the first insulating layer 20 in the first direction X.
  • the fourth adhesive portion 70 is located on the first block 101b1 of the area 101b.
  • the fourth bonding part 70 may at least include but not limited to cellulose, polyvinylidene fluoride-co-hexafluoropropylene, polyvinylidene fluoride-co-trichloroethylene, polymethyl methacrylate, polybutylene acrylate Ester, polyacrylonitrile, polyvinylpyrrolidone, polyvinyl acetate, polyethylene-co-vinyl acetate, polyethylene oxide, polyarylate, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, A polymer of cyanoethyl pullulan, cyanoethyl polyvinyl alcohol, cyanoethyl cellulose, cyanoethyl sucrose, pullulan, carboxymethyl cellulose, and polypropylene-maleic anhydride or A mixture of any combination of the above-mentioned polymers.
  • the shape of the fourth bonding portion 70 is not limited, and can be circular (refer to Figure 9), rectangular (refer to Figures 14 and 15), or striped (refer to Figure 16) , Other regular or irregular shapes or a combination of these graphics.
  • the number of the fourth bonding portion 70 can also be set according to actual needs, and it is one or more. When the number of fourth bonding parts 70 is multiple, the plurality of fourth bonding parts 70 are arranged at intervals (for example, distributed in a dot matrix).
  • the battery 100 may include at least two different shapes.
  • the fourth bonding portion 70 please refer to Figure 17). In some embodiments, when viewed from the third direction Z, the shapes of all the fourth bonding portions 70 may also be the same.
  • the housing 80 further adheres to the electrode assembly 10 through the fourth adhesive portion 70.
  • the number of fourth bonding parts 70 is multiple, after the plurality of fourth bonding parts 70 are bonded to the housing 80, the plurality of fourth bonding parts 70 can be arranged at intervals, or adjacent first The four bonding parts 70 are connected to each other (please refer to FIG. 16).
  • the first insulating layer 20 and the second insulating layer 30 also extend from the first surface 101 to the connection area 105 respectively.
  • the first insulating layer 20 and the second insulating layer 30 respectively extend from the first surface 101 to the second portion 107.
  • the first insulating layer 20 and the second insulating layer 30 can also extend from the second portion 107 to the second surface 103 respectively.
  • the first insulating layer 20 and the second insulating layer 30 are arranged on the first surface 101 to isolate the electrode assembly 10 and the housing 80, thereby reducing the contact between the electrode assembly 10 and the housing 80, and reducing the possibility of the electrode assembly 10 damaging the housing 80 At the same time, damage to the casing caused by the active material falling on the area where the electrode assembly 10 is combined with the first insulating layer 20 and the second insulating layer 30 is avoided.
  • the first insulating layer 20 and the second insulating layer 30 can also buffer between the electrode assembly 10 and the case 80, reducing the possibility of damage to the case 80 caused by sharp points on the surface of the electrode assembly 10 sex.
  • the first insulating layer 20 and the second insulating layer 30 can also serve to fix the electrode assembly 10 and suppress the electrode assembly.
  • the assembly 10 is spread out.
  • the electrode assembly 10 may further include a third insulating layer 17 which is disposed on the second surface 103 and fixes the end of the pole piece 11 of the outermost circle of the electrode assembly 10.
  • the position where the first insulating layer 20 and the second insulating layer 30 are disposed is not limited to the above-mentioned situation.
  • the first insulating layer 20 can also extend from the first portion 106 to the first surface 101 and not to the second portion 107
  • the second insulating layer 30 can also extend from the first portion 106 to the first surface 101 and Not to the second part 107.
  • the first surface 101 and the first portion 106 intersect at the second side 18.
  • the first insulating layer 20 may extend from the second edge 18 along the first surface 101 toward the second portion 107 and not reach the second portion 107; the second insulating layer 30 may extend from the second The edge 18 extends along the first surface 101 toward the second portion 107 and does not reach the second portion 107.
  • the first insulating layer 20 extends from the second portion 107 to the first surface 101 and does not reach the second portion 106; the second insulating layer 30 extends from the first portion 106 to the first surface 101 and does not reach The second part 107, at this time, the first direction X is perpendicular to the direction where the second part 107 is located.
  • the electrode assembly 10 may also be a stacked structure.
  • the fourth bonding portion 70 can also be disposed on the second surface 103 and can also be disposed on the third insulating layer 17.
  • the first insulating layer 20 and the second insulating layer 30 extend to the second surface 103
  • the first bonding portion 40, the second bonding portion 50, and the third bonding portion 60 can also correspond to the first bonding portion located on the second surface 103.
  • An insulating layer 20 and a second insulating layer 30 are provided.
  • the method for manufacturing the battery 100 described above includes the following steps: providing the electrode assembly 10; pasting the first insulating layer 20 and the second insulating layer 30 on the electrode assembly 10; A first bonding part 40 is formed on the surface of the assembly 10; the electrode assembly 10 provided with the first bonding part 40, the first insulating layer 20, the second insulating layer 30, and the third insulating layer 17 is housed in the housing 80 In; and then press the outside of the housing 80, so that the first bonding portion 40 and the inside of the housing 80 are bonded.
  • the manufacturing method of the battery 100 may further include: pasting the third insulating layer 17 on the electrode assembly 10 before forming the first adhesive part 40.
  • the third insulating layer 17 is pasted on the electrode assembly 10 before the first insulating layer 20 and the second insulating layer 30 are pasted on the electrode assembly 10.
  • the manufacturing method of the battery 100 may further include: before the electrode assembly 10 is placed in the housing 80, the first insulating layer 20 and the second insulating layer may be deposited on the first insulating layer 20 and the second insulating layer by, for example, but not limited to, screen printing, spray gun dispensing, etc.
  • the surface of at least one of 30 forms a second adhesive part 50. After pressing the outer side of the casing 80, the second bonding portion 50 is bonded to the inner side of the casing 80.
  • the manufacturing method of the battery 100 may further include: before the electrode assembly 10 is placed in the housing 80, the first insulating layer 20 and the second insulating layer may be deposited on the first insulating layer 20 and the second insulating layer by, for example, but not limited to, screen printing, spray gun dispensing, etc.
  • the surface of at least one of 30 and the surface of the electrode assembly 10 form a third bonding portion 60. After pressing the outer side of the housing 80, the third bonding portion 60 is bonded to the inner side of the housing 80.
  • the manufacturing method of the battery 100 may further include: before the electrode assembly 10 is housed in the housing 80, a fourth bond may be formed on the surface of the electrode assembly 10 by, for example, but not limited to, screen printing, spray gun dispensing, etc. ⁇ 70. After pressing the outer side of the housing 80, the fourth bonding portion 70 is bonded to the inner side of the housing 80.
  • the surface of the electrode assembly is not provided with an adhesive part, and a first insulating layer and a second insulating layer are arranged on the electrode assembly.
  • the first insulating layer and the second insulating layer respectively extend from the first surface through the second part to The second surface is used to fix the electrode assembly.
  • the case (aluminum plastic film) contains the electrode assembly and is fixed with the electrode assembly through the adhesive part.
  • the electrolyte is injected and the case is sealed to obtain the battery. After the battery is chemically formed, the standard charging and discharging process is carried out to activate the battery capacity. , And finally complete the preparation of the battery degassing treatment.
  • the difference between Comparative Example 2 and Comparative Example 1 is that the first surface of the electrode assembly is located on the first area on the side of the first insulating layer and the second insulating layer away from the second part. Department.
  • the difference between Example 1 and Comparative Example 2 is that the adhesive part is also provided on the first surface of the electrode assembly, except for the area where the first insulating layer and the second insulating layer are provided, and the area other than the first area.
  • the second area that is, the second area includes the area between the first insulating layer and the second insulating layer, the area on the side of the first insulating layer away from the second insulating layer, and the area on the side of the second insulating layer away from the first insulating layer. area.
  • the difference between Embodiment 2 and Embodiment 1 is that the bonding portion is also provided at the junction of the surface of the first insulating layer away from the first surface and the first surface, and the first insulating layer is away from the first surface.
  • the difference between Embodiment 3 and Comparative Example 2 is that the adhesive part is also provided on the first surface of the electrode assembly in the region between the first insulating layer and the second insulating layer.
  • the difference between Embodiment 4 and Comparative Example 1 is that the adhesive part is only provided on the first surface of the electrode assembly in the region between the first insulating layer and the second insulating layer.
  • the batteries of Comparative Examples 1-2 and Examples 1-4 were charged at a normal temperature with a current of 0.2C, and the thickness of the battery was measured after being fully charged; then each battery was discharged to the cut-off voltage, and then a current of 0.8C
  • the thickness of each area of the battery is measured after the constant current and constant voltage is charged to the limit voltage as the initial thickness (here is the thickness of the area where the battery is provided with the first insulating layer D1 or the thickness of the area where the battery is provided with the second insulating layer D2.
  • the thickness D3 of the area between the first insulating layer and the second insulating layer is shown in FIG.
  • the provision of the first insulating layer and the second insulating layer can suppress the expansion of the battery.
  • the deformation amount of the battery with the adhesive part between the first insulating layer and the second insulating layer is significantly smaller than that of the battery without the adhesive part between the second insulating layer and the second insulating layer.
  • the two opposite surfaces that connect the first part (that is, the head) and the second part (that is, the bottom) in the connection area of the electrode assembly are defined as the third part and the fourth part, respectively.
  • the batteries of Comparative Examples 1-2 and Examples 1-4 were charged to a limit voltage at a normal temperature with a current of 0.2C, and then the batteries were dropped for a drop test. Specifically, the battery was fixed in a battery drop test box with a special glue. The robotic arm grabs the drop test box with the battery and releases it to the marble slab at a height of 1.8m according to a preset drop method.
  • the preset drop method is to press the first surface down in each round ⁇ the second The surface is down ⁇ the first part is down ⁇ the third part is down ⁇ the second part is down ⁇ the fourth part is down. After each round of falling, observe whether the surface of the battery (that is, the aluminum-plastic film) is damaged, and measure the open circuit voltage of the battery. If the open circuit voltage of the battery is less than 3.0V, the battery will fail. If the surface of the battery, that is, the aluminum-plastic film is damaged, the battery will also be judged to be failed. In each group of comparative examples or examples, 5 batteries were tested in each round and averaged. Table 2 records the number of drop rounds when each battery fails, the reason for the failure, and the damage of the battery at the time of failure.
  • the provision of an adhesive part in the area between the first insulating layer and the second insulating layer is more conducive to improving battery drop failure than not providing an adhesive part, and thus is more conducive to improving the safety of the battery.
  • the provision of the first insulating layer and the second insulating layer at the same time the adhesive part can improve the drop failure of the battery, which is beneficial to improve the safety of the battery.
  • a first insulating layer and a second insulating layer are provided on the surface of the electrode assembly, and a first adhesive part is provided between the first insulating layer and the second insulating layer.
  • a bonding part adheres the electrode assembly and the casing.

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Abstract

一种电池（100），包括电极组件（10）、第一绝缘层（20）、第二绝缘层（30）和第一粘接部（40）。电极组件（10）包括第一表面（101）以及与所述第一表面（101）相背设置的第二表面（103）；第一绝缘层（20）设置于所述第一表面（101）；第二绝缘层（30）设置于所述第一表面（101），且与所述第一绝缘层（20）沿一第一方向间隔设置；所述第一粘接部（40）设置于所述第一表面（101），并位于所述第一绝缘层（20）和所述第二绝缘层（30）之间的区域。该电池有利于提高耐冲击性能。

Description

电池 技术领域
本申请涉及一种电池。
背景技术
随着消费类电子产品、电动汽车等的成熟应用，客户对整机应用风险越来越关注。例如，对电子产品耐冲击的要求越来越高。而电池作为电子产品的重要组成部分，同样对耐冲击具有要求。电池在电子产品受到冲击时，收容于电池壳体内的电极组件容易破坏壳体，或者电极组件自身因冲击被破坏，从而影响电池的安全性及使用寿命。
发明内容
鉴于上述情况，有必要提供一种有利于提高耐冲击性能从而改善安全性的电池。
本申请提供了一种电池，包括：
电极组件，包括第一表面以及与第一表面相背设置的第二表面；
第一绝缘层，设置于第一表面；
第二绝缘层，设置于第一表面，且与第一绝缘层沿一第一方向间隔设置；以及
第一粘接部，其中，第一粘接部设置于第一表面，并位于第一绝缘层和第二绝缘层之间的区域。
作为本申请的一种方案，第一粘接部在第一表面的正投影的面积小于第一绝缘层和第二绝缘层在所述第一表面的正投影的总面积。
作为本申请的一种方案，第一粘接部在第一表面的正投影的面积小于所述第一绝缘层在第一表面的正投影的面积，并且小于第二绝缘层在所述第一表面的正投影的面积。
作为本申请的一种方案，从垂直于所述第一表面的方向上观察，第一表面与第一绝缘层重叠的部分区域至第二表面的距离为第一距离，第一粘接部至第二表面的距离为第二距离，第一距离小于第二距离。
作为本申请的一种方案，第一距离为所述第一表面与所述第一绝缘层对应的端部处至所述第二表面的距离。
作为本申请的一种方案，从垂直于所述第一表面的方向上观察，第一表面与第二绝缘层重叠的部分区域至第二表面的距离为第三距离，第三距离小于第二距离。
作为本申请的一种方案，第三距离为第一表面与第二绝缘层对应的端部处至第二表面的距离。
作为本申请的一种方案，第一距离与第三距离不相等。
作为本申请的一种方案，第一粘接部在第一方向上的长度小于第一表面在第一方向上的长度的一半。
作为本申请的一种方案，第一表面对应第一粘接部设有第一凹槽，第一粘接部位于第一凹槽中。
作为本申请的一种方案，第一粘接部为两个或两个以上，每一第一粘接部位于一第一凹槽中。
作为本申请的一种方案，电池还包括第二粘接部，第二粘接部设置于第一绝缘层背离第二表面的表面，且第二粘接部在第一表面的正投影的面积小于第一绝缘层在第一表面的正投影的面积。
作为本申请的一种方案，第一粘接部呈点阵分布，以及/或者第二粘接部呈点阵分布。
作为本申请的一种方案，第一绝缘层对应第二粘接部的表面设有第二凹槽，每一第二粘接部位于第二凹槽中。
作为本申请的一种方案，电极组件还包括连接第一表面和第二表面的连接区，第一绝缘层自第一表面延伸至连接区，第二绝缘层自第一表面延伸至连接区。
作为本申请的一种方案，第一绝缘层和第二绝缘层位于电极组件的同一侧。
作为本申请的一种方案，电极组件还包括金属部，连接区包括第一部分和与第一部分相背的第二部分，金属部设置于第一部分，第一绝缘层和第二绝缘层延伸至第二部分。
作为本申请的一种方案，电池还包括第三粘接部，第三粘接部设置于第一绝缘层背离第二表面的表面，并延伸至第一表面未设第一绝缘层的区域。
作为本申请的一种方案，电池还包括第四粘接部，第四粘接部设置于第一表面，所述第一表面设有所述第四粘接部的区域与所述第一表面设有第一绝缘层和第二绝缘层的区域以及所述第一表面位于所述第一绝缘层和所述第二绝缘层之间的区域间隔，且第四粘接部不与第一绝缘层和第二绝缘层接触。
作为本申请的一种方案，从垂直于第一表面的方向上观察，电极组件包括至少两个形状不同的第四粘接部。
作为本申请的一种方案，电极组件还包括第三绝缘层，电极组件为卷绕结构，第三绝缘层设置于第二表面并固定电极组件的最外圈极片的端部。
作为本申请的一种方案，电池还包括壳体，壳体包裹所述电极组件、第一绝缘层及第二绝缘层，并通过第一粘接部与电极组件粘接。
本申请的电池，其在电极组件的表面设置第一绝缘层和第二绝缘层，并在第一绝缘层和第二绝缘层之间设置第一粘接部，壳体封装电极组件时，第一粘接部粘接电极组件和壳体，在电池收到外力作用时，有利于提高电池的安全性，延长电池的使用寿命。
附图说明
图1为本申请一实施方式的电池的结构示意图。
图2为本申请一实施方式的电池的侧视图。
图3为本申请一实施方式的堆叠体的结构示意图。
图4为本申请一实施方式的第一导电层的结构示意图。
图5为本申请一实施方式的第二导电层的结构示意图。
图6为本申请一实施方式的电极组件的结构示意图。
图7为本申请一实施方式的电极组件的结构示意图。
图8为本申请一实施方式的电池的结构示意图。
图9为本申请一实施方式的电池的正视图。
图10为本申请一实施方式的电池沿第一方向的剖面示意图。
图11为本申请一实施方式的电池沿第二方向的剖面示意图。
图12为本申请一实施方式的电池沿第一方向的剖面示意图。
图13为本申请一实施方式的电池沿第一方向的剖面示意图。
图14为本申请一实施方式的第一粘接部或第四粘接部的结构示意图。
图15为本申请一实施方式的第一粘接部或第四粘接部的结构示意图。
图16为本申请一实施方式的第一粘接部或第四粘接部的结构示意图。
图17为本申请一实施方式的第一粘接部或第四粘接部的结构示意图。
图18为本申请一实施方式的电池的结构示意图。
图19为本申请一实施方式的电池的部分拆解示意图。
图20为本申请一实施方式的电池沿第二方向的局部剖面示意图。
图21为本申请一实施方式的电池沿第二方向的局部剖面示意图。
图22为本申请一实施方式的电池的侧视图。
图23为本申请一实施方式的电池的后视图。
图24为本申请一实施方式的电池的底视图。
图25为本申请一实施方式的电池的结构示意图。
图26为本申请一实施方式的电池的结构示意图。
图27为本申请一实施方式的电池的底视图。
图28为本申请中对比例2的电池的部分结构示意图。
图29为本申请中对比例3的电池的部分结构示意图。
图30为本申请中实施例1的电池的部分结构示意图。
图31为本申请中实施例2的电池的部分结构示意图。
图32为本申请中实施例3的电池的部分结构示意图。
图33为本申请中实施例4的电池的部分结构示意图。
图34为本申请中一实施例的电池的结构示意图。
主要元件符号说明
Figure PCTCN2020082592-appb-000001
Figure PCTCN2020082592-appb-000002
Figure PCTCN2020082592-appb-000003
如下具体实施方式将结合上述附图进一步说明本申请。
具体实施方式
下面对本申请实施例中的技术方案进行清楚、详细地描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。除非另有定义，本文所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同。在本申请的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请。
下文，将详细地描述本申请的实施方式。但是，本申请可体现为许多不同的形式，并且不应解释为限于本文阐释的示例性实施方式。而是，提供这些示例性实施方式，从而使本申请透彻的和详细的向本领域技术人员传达。
另外，为了简洁和清楚，在附图中，各种组件、层的尺寸或厚度可被放大。遍及全文，相同的数值指相同的要素。如本文所使用，术语“及/或”、“以及/或者”包括一个或多个相关列举项目的任何和所有组合。另外，应当理解，当要素A被称为“连接”要素B时，要素A可直接连接至要素B，或可能存在中间要素C并且要素A和要素B可彼此间接连接。
进一步，当描述本申请的实施方式时使用“可”指“本申请的一个或多个实施方式”。
本文使用的专业术语是为了描述具体实施方式的目的并且不旨在限制本申请。如本文所使用，单数形式旨在也包括复数形式，除非上下文另外明确指出。应进一步理解，术语“包括”，当在本说明书中使用时，指存在叙述的特征、数值、步骤、操作、要素和/或组分，但是不排除存在或增加一个或多个其他特征、数值、步骤、操作、要素、组分和/或其组合。
空间相关术语，比如“上”等可在本文用于方便描述，以描述如图中阐释的一个要素或特征与另一要素(多个要素)或特征(多个特征)的关系。应理解，除了图中描述的方向之外，空间相关术语旨在包括设备或装置在使用或操作 中的不同方向。例如，如果将图中的设备翻转，则描述为在其他要素或特征“上方”或“上”的要素将定向在其他要素或特征的“下方”或“下面”。因此，示例性术语“上”可包括上面和下面的方向。应理解，尽管术语第一、第二、第三等可在本文用于描述各种要素、组分、区域、层和/或部分，但是这些要素、组分、区域、层和/或部分不应受这些术语的限制。这些术语用于区分一个要素、组分、区域、层或部分与另一要素、组分、区域、层或部分。因此，下面讨论的第一要素、组分、区域、层或部分可称为第二要素、组分、区域、层或部分，而不背离示例性实施方式的教导。
下面对本申请的一些实施方式作详细说明。在不冲突的情况下，下述的实施例及实施例中的特征可以相互组合。
请参阅图1，电池100包括电极组件10、第一绝缘层20、第二绝缘层30和第一粘接部40。
请参阅图1，电极组件10包括第一表面101、与第一表面101相背设置的第二表面103、以及连接第一表面101以及第二表面103的连接区105。
请参阅图1，电极组件10包括极片11和隔离膜(图未示)，并由极片11和隔离膜卷绕形成卷绕结构。第一表面101、第二表面103和连接区105作为电极组件10外表面的一部分。
例如，如图1所示的电极组件10经过多次卷绕形成的结构，此时，电极组件10在一方向即图中X方向上存在多个弯折部，多个弯折部分别分布于电池100沿X方向的中心的相对两侧，在图1中，分别为左右两侧。其中，电极组件10的一外平面与位于电池100中心左侧的最外侧的弯折部最靠近电池100中心的一端连接处为第一端101A，电极组件10的外平面与位于电池100中心右侧的最外侧的弯折部最靠近电池100中心的一端连接处为第二端101B。
在本实施方式中，第一表面101为，例如，在图1所示的Z方向观察时，第一端101A、第二端101B以及电极组件10沿Y方向的两个末端即第一边16和第二边18围成的区域。
例如，针对由极片11和隔离膜沿Z方向堆叠而成的堆叠式的电极组件10，电极组件10包括四个垂直于Z方向的边缘，四个边缘围成的区域为第二表面103。
下面以一例子进一步地对电极组件10进行说明。
请参阅图3，电池组件10可包括：第一导电层10A、第一隔离层10B、第二导电层10C和第二隔离层10D。其中，第一隔离层10B形成于第一导电层10A的表面10a。第二导电层10C形成于第一隔离层10B背离第一导电层10A的表面10b。第二隔离层10D形成于第二导电层10C背离第一隔离层10B的表面10c。由此，可形成堆叠体10E，并以堆叠体10E为基础形成电极组件10。
请参阅图3和图4，从垂直于表面10a的方向上来看，第一导电层10A，例如，可呈矩形。第一导电层10A，例如，可由集流体10AA和活性物质层10AB相互堆叠形成。集流体10AA，例如，至少可以包括但不限于铝网、铝箔等导电金属薄板中的一种或多种。活性物质层10AB，例如，至少可包括但不仅限于钴酸锂、镍钴锰酸锂、镍钴铝酸锂、锰酸锂、镍酸锂、磷酸锰铁锂、磷酸钒锂、磷酸钒氧锂、磷酸铁锂、钛酸锂和富锂锰基材料中的一种或多种。第一导电层10A，例如，在组成电池100的电极组件10时可作为正极极片。
请参阅图3，从垂直于表面10b的方向上来看，第一隔离层10B，例如，可呈矩形。第一隔离层10B，例如，至少可以包括但不限于聚乙烯、聚丙烯、聚对苯二甲酸乙二醇酯、聚酰亚胺和芳纶中的一种或多种。第一隔离层10B，例如，在组成电池100的电极组件10时可作为隔离膜。
请参阅图3和图5，从垂直于表面10c的方向上来看，第二导电层10C，例如，可呈矩形。第二导电层10C，例如，可由集流体10CA和活性物质层10CB相互堆叠形成。集流体10CA，例如，至少可以包括但不限于镍箔、铜箔等导电金属薄板中在一种或两种。活性物质层10CB，例如，至少可包括但不仅限于石墨、软碳、硬碳、石墨烯、中间相碳微球、硅基材料、锡基材料、钛酸锂或其他能与锂形成合金的金属中的一种或多种。第二导电层10C，例如，在组成电池100的电极组件10时可作为负极极片。
从垂直于表面10b的方向上来看，第二隔离层10D，例如，可呈矩形。第二隔离层10D，例如，至少可以包括但不限于聚乙烯、聚丙烯、聚对苯二甲酸乙二醇酯、聚酰亚胺和芳纶中的一种或多种。第二隔离层10D，例如，在组成电池100的电极组件10时可作为隔离膜。
请参阅图6，电极组件10，例如，可通过将多个堆叠体10E堆叠而成的堆叠体10Ea卷绕而成。或者例如，请参阅图7，电极组件10可通过将多个 堆叠体10E直接堆叠而成。
在本实施方式中，电极组件10中的外表面包括第一表面101以及背离第一表面101的第二表面103。此外，电极组件10的外表面还包括，在垂直于第一表面101的在第三方向Z上的连接区105。
本实施方式中，第二表面103为，例如，在图1所示的Z方向观察时，电极组件10中与第一表面101相背的平面与第一端101A、第二端101B以及电极组件10沿Y方向的两个末端即第一边16和第二边18围成的区域对应的区域。
请参阅图1和图8，连接区105包括第一部分106和与第一部分106相背的第二部分107。电极组件10还可包括金属部15，金属部15设置于第一部分106。金属部15的一端连接极片11，另一端可与其他电子元件连接以实现电极组件10可与其他电子元件的电导通。
第一绝缘层20和第二绝缘层30均设置于第一表面101，且第一绝缘层20与第二绝缘层30沿一第一方向X间隔设置。
在本实施方式中，从第三方向Z来看，第一绝缘层20，例如，可为矩形。第一绝缘层20，例如，至少可以包括但不限于聚酰亚胺、聚氯乙烯、聚乙烯和聚丙烯中的一种或多种。从第三方向Z来看，第二绝缘层30，例如，可为矩形。第二绝缘层30，例如，至少可以包括但不限于聚酰亚胺、聚氯乙烯、聚乙烯和聚丙烯中的一种或多种。
第一表面101与第二部分107相交于第一边16。在一些实施方式中，第一方向X为第一边16所在的方向。从第三方向Z来看，第一绝缘层20和第二绝缘层30分别自第一边16沿第一表面101朝第一部分106延伸并且并未至第一部分106。
第一绝缘层20自第一边16朝第一部分106延伸的长度L1以及第二绝缘层30自第一边16朝第一部分106延伸的长度L2，在第一绝缘层20未至第一部分106和第二绝缘层30未至第一部分106的情况下，并未特别限制。在本实施方式中，第一绝缘层20自第一边16朝第一部分106延伸的长度L1与第二绝缘层30自第一边16朝第一部分106延伸的长度L2相等。在此，定义上述长度方向为第二方向Y。
第一绝缘层20和第二绝缘层30可分别包括层叠设置的胶层和基材，其中，胶层粘接基材和电极组件10。胶层，例如，至少可以包括但不限于天然 橡胶、合成橡胶、丙烯酸酯、硅胶、乙烯-醋酸乙烯酯中的至少一种或多种。基材，例如，至少可以包括但不限于聚乙烯、聚丙烯、铁氟龙、聚氯乙烯、聚酰亚胺、无纺布中的至少一种或多种。
请参阅图1、图2和图9，从垂直于第一表面101的第三方向Z进行观察时，第一粘接部40设置于第一表面101，并位于第一绝缘层20和第二绝缘层30之间的区域101a。在第二方向Y上，第一粘接部40不超出第一绝缘层20和第二绝缘层30。在一些实施方式中，上述区域101a在第一方向X上的长度可小于第一表面101在第一方向X上的长度的一半。
在一些实施方式中，第一粘接部40在第一表面101的正投影的面积，换言之，第一粘接部40沿垂直于第一表面101的第三方向Z上在第一表面101的投影的面积可小于第一绝缘层20和第二绝缘层30在第一表面101的正投影的总面积。进一步地，在一些实施方式中，第一粘接部40在第一表面101的正投影的面积可小于第一绝缘层20在第一表面101的正投影的面积，并且同时可小于第二绝缘层30在第一表面101的正投影的面积。
第一粘接部40，例如，至少可以包括但不限于纤维素、聚偏二氟乙烯-共六氟丙烯、聚偏二氟乙烯-共三氯乙烯、聚甲基丙烯酸甲酯、聚丙烯酸丁酯、聚丙烯腈、聚乙烯吡咯烷酮、聚乙酸乙烯酯、聚乙烯-共-乙酸乙烯酯、聚环氧乙烷、聚芳酯、醋酸纤维素、醋酸丁酸纤维素、醋酸丙酸纤维素、氰乙基普鲁兰多糖、氰乙基聚乙烯醇、氰乙基纤维素、氰乙基蔗糖、普鲁兰多糖、羧甲基纤维素和聚丙烯-马来酸酐中的一种聚合物或者上述聚合物的任意组合构成的混合物。
请参阅图10，第一表面101与第一绝缘层20重叠的至少部分区域至第二表面103的第一距离H1小于第一粘接部40至第二表面103的第二距离H2。在保证第一距离H1小于第二距离H2的前提下，上述第一表面101与第一绝缘层20重叠的至少部分区域中不同位置处至第二表面103的距离可不同。进一步地，请结合图1、图9和图10，这里，第一边16与第一绝缘层20重叠的至少部分区域，是指第一表面101与第一绝缘层20对应的端部处，至第二表面103的第一距离H1小于第一粘接部40至第二表面103的第二距离H2。
具体的，请参阅图11，第一表面101上设有第一凹部120，第一凹部120自第一边16朝第一部分106设置。第一绝缘层20中至少远离第一部分106 的部分设置于第一凹部120中。在本实施方式中，第一凹部120可为一倾斜槽，其深度自第一边16沿第二方向Y朝第一部分106逐渐减小。第一绝缘层20中靠近第一部分106的部分可位于第一凹部120外。
请结合图1、图9和图10，第一表面101与第二绝缘层30重叠的至少部分区域至第二表面103的第三距离H3小于第二距离H2。在保证第三距离H3小于第二距离H2的前提下，上述第一表面101与第二绝缘层20重叠的至少部分区域中不同位置处至第二表面103的距离可不同。进一步地，这里，第一边16与第二绝缘层30重叠的至少部分区域，是指第一表面101与第二绝缘层30对应的端部处，至第二表面103的第三距离H3小于第二距离H2。
请参阅图11，第一表面101上设有第二凹部130，第二凹部130自第一边16朝第一部分106设置。第二绝缘层30中至少远离第一部分106的部分设置于第二凹部130中。在本实施方式中，第二凹部130可为一倾斜槽，其深度自第一边16沿第二方向Y朝第一部分106逐渐减小。第二绝缘层30中靠近第一部分106的部分可位于第二凹部130外。
在一些实施方式中，请参阅图12，上述第一距离H1与上述第三距离H3可不相等。
请参阅图13，所述第一表面101可设有第一凹槽140，第一粘接部40位于第一凹槽140中。在本实施方式中，第一粘接部40的数量为多个，第一凹槽140的数量为多个，每一第一粘接部40位于一个第一凹槽140中。
从第三方向Z上观察，第一粘接部40的形状不受限制，可以为圆形(请参阅图9)、矩形(请参阅图14和图15)、条状(请参阅图16)、其他规则或不规则的形状再或者这些图形的组合。第一粘接部40的数量也可根据实际需要进行设置，为一个或者多个。当第一粘接部40的数量为多个时，多个第一粘接部40间隔设置(例如呈点阵分布)，从第三方向Z上观察，电池100中可包括至少两个形状不同的第一粘接部40(请参阅图17)。在一些实施方式中，请参阅图9，从第三方向Z上观察，所有的第一粘接部40的形状也可一致。
请参阅图18和图19，电池100还可包括壳体80。壳体80，例如，可为但不限于铝塑膜、热缩膜、铝壳、钢壳中的一种或几种。壳体80包裹电极组件10、第一绝缘层20和第二绝缘层30，并通过第一粘接部40与电极组件10粘接(请同时参阅图20)。第一粘接部40设置于第一绝缘层20和第二 绝缘层30的区域101a中，使得电池100中设有第一绝缘层20和第二绝缘层30的区域以及电池中对应区域101a的区域在化成过程中水平方向即沿第一方向X和第二方向Y受压缩的程度更加均匀，有利于减小电池100在使用过程中的变形程度。将第一粘接部40设置于第一绝缘层20和第二绝缘层30之间能够增加电极组件10和壳体80之间的粘接力，以便于电池100受外力作用时抑制电极组件10和壳体80之间的相对位移，进而减小电池100因外力作用受损的可能性，延长电池100的使用寿命。同时，因第一粘接部40粘接壳体80和电极组件10，还有助于抑制电极组件10的变形。另外，第一粘接部40在粘接壳体80后的形状可发生改变。当第一粘接部40的数量为多个时，多个第一粘接部40在粘接壳体80后，多个第一粘接部40之间可保持间隔设置，或者相邻的第一粘接部40之间相连(请参阅图16)。
请参阅图1、图2、图9和图10，电池100还可包括第二粘接部50，第二粘接部50设置于第一绝缘层20背离第二表面103的表面21。第二粘接部50在第一表面101的正投影的面积小于第一绝缘层20在第一表面101的正投影的面积。第二绝缘层30背离第二表面103的表面31也可设置第二粘接部50，此时，第二粘接部50在第一表面101的正投影的面积小于第二绝缘层30在第一表面101的正投影的面积。
第二粘接部50，例如，至少可以包括但不限于纤维素、聚偏二氟乙烯-共六氟丙烯、聚偏二氟乙烯-共三氯乙烯、聚甲基丙烯酸甲酯、聚丙烯酸丁酯、聚丙烯腈、聚乙烯吡咯烷酮、聚乙酸乙烯酯、聚乙烯-共-乙酸乙烯酯、聚环氧乙烷、聚芳酯、醋酸纤维素、醋酸丁酸纤维素、醋酸丙酸纤维素、氰乙基普鲁兰多糖、氰乙基聚乙烯醇、氰乙基纤维素、氰乙基蔗糖、普鲁兰多糖、羧甲基纤维素和聚丙烯-马来酸酐中的一种聚合物或者上述聚合物的任意组合构成的混合物。
从第三方向Z上观察，第二粘接部50的形状不受限制，可以为圆形、矩形、条状、其他规则或不规则的形状再或者这些图形的组合。第二粘接部50的数量也可根据实际需要进行设置，为一个或者多个。当第二粘接部50的数量为多个时，多个第二粘接部50间隔设置(例如呈点阵分布)，从第三方向Z上观察，电池100中可包括至少两个形状不同的第二粘接部50。在一些实施方式中，从第三方向Z上观察，所有的第二粘接部50的形状也可一致。
在一些实施方式中，请参阅图13，第一绝缘层20背离第二表面103的表面设有第二凹槽150，第二粘接部50位于第二凹槽150中。
请参阅图18和图21，壳体80通过第二粘接部50粘接第一绝缘层20。壳体80还可通过第二粘接部50粘接第二绝缘层30。壳体80还可通过第二粘接部50粘接第一绝缘层20和第二绝缘层30。当第二粘接部50的数量为多个时，多个第二粘接部50在粘接壳体80后，多个第二粘接部50之间可保持间隔设置，或者相邻的第二粘接部50之间相连。
请参阅图1、图2和图9，电池100还可包括第三粘接部60，第三粘接部60设置于第一绝缘层20背离第二表面103的表面21，并跨第一绝缘层20与第一表面101的交界处延伸至第一表面101。
第三粘接部60，例如，至少可以包括但不限于纤维素、聚偏二氟乙烯-共六氟丙烯、聚偏二氟乙烯-共三氯乙烯、聚甲基丙烯酸甲酯、聚丙烯酸丁酯、聚丙烯腈、聚乙烯吡咯烷酮、聚乙酸乙烯酯、聚乙烯-共-乙酸乙烯酯、聚环氧乙烷、聚芳酯、醋酸纤维素、醋酸丁酸纤维素、醋酸丙酸纤维素、氰乙基普鲁兰多糖、氰乙基聚乙烯醇、氰乙基纤维素、氰乙基蔗糖、普鲁兰多糖、羧甲基纤维素和聚丙烯-马来酸酐中的一种聚合物或者上述聚合物的任意组合构成的混合物。
请参阅图18和图21，第三粘接部60粘附壳体80。壳体80可通过第三粘接部60粘接第一绝缘层20。壳体80还可通过第三粘接部60粘接第二绝缘层30。壳体80还可通过第三粘接部60同时粘接第一绝缘层20和第二绝缘层30。
请参阅图1、图2、图9和图21，电池100还可包括第四粘接部70，第四粘接部70设置于第一表面101的区域101b上。区域101b与第一表面101设有第一绝缘层20和第二绝缘层30的区域以及第一表面101中的区域101a间隔，且第四粘接部70不和第一绝缘层20以及第二绝缘层30接触。
具体的，请参阅图9，区域101b包括第一区块101b1和第二区块101b2。第一区块101b1在第二方向Y上背离区域101a。第二区块101b2在第一方向X上位于第一绝缘层20背离第二绝缘层30的一侧及第二绝缘层30背离所述第一绝缘层20的一侧。在本实施方式中，第四粘接部70位于区域101b的第一区块101b1上。
第四粘接部70，例如，至少可以包括但不限于纤维素、聚偏二氟乙烯- 共六氟丙烯、聚偏二氟乙烯-共三氯乙烯、聚甲基丙烯酸甲酯、聚丙烯酸丁酯、聚丙烯腈、聚乙烯吡咯烷酮、聚乙酸乙烯酯、聚乙烯-共-乙酸乙烯酯、聚环氧乙烷、聚芳酯、醋酸纤维素、醋酸丁酸纤维素、醋酸丙酸纤维素、氰乙基普鲁兰多糖、氰乙基聚乙烯醇、氰乙基纤维素、氰乙基蔗糖、普鲁兰多糖、羧甲基纤维素和聚丙烯-马来酸酐中的一种聚合物或者上述聚合物的任意组合构成的混合物。
从第三方向Z上观察，第四粘接部70的形状不受限制，可以为圆形(请参阅图9)、矩形(请参阅图14和图15)、条状(请参阅图16)、其他规则或不规则的形状再或者这些图形的组合。第四粘接部70的数量也可根据实际需要进行设置，为一个或者多个。当第四粘接部70的数量为多个时，多个第四粘接部70间隔设置(例如呈点阵分布)，从第三方向Z上观察，电池100中可包括至少两个形状不同的第四粘接部70(请参阅图17)。在一些实施方式中，从第三方向Z上观察，所有的第四粘接部70的形状也可一致。
请参阅图18和图21，壳体80还通过第四粘接部70粘接电极组件10。当第四粘接部70的数量为多个时，多个第四粘接部70在粘接壳体80后，多个第四粘接部70之间可保持间隔设置，或者相邻的第四粘接部70之间相连(请参阅图16)。
请参阅图2、图21及图22，第一绝缘层20和第二绝缘层30还分别自第一表面101延伸至连接区105。在本实施方式中，第一绝缘层20和第二绝缘层30分别自第一表面101延伸至第二部分107。进一步地，第一绝缘层20和第二绝缘层30还可分别自第二部分107继续延伸至第二表面103。第一绝缘层20和第二绝缘层30设置于第一表面101能够隔离电极组件10和壳体80，进而减少电极组件10与壳体80的接触，降低电极组件10破坏壳体80的可能性，同时避免了电极组件10与第一绝缘层20和第二绝缘层30结合的区域上的活性物质掉落引起的壳体破损。另外，在电池100跌落时，第一绝缘层20和第二绝缘层30还能够在电极组件10和壳体80之间进行缓冲，降低电极组件10表面的尖锐处冲击壳体80导致破损的可能性。而当第一绝缘层20和第二绝缘层30延伸至第二部分107甚至第二表面103时，第一绝缘层20和第二绝缘层30还能够起到固定电极组件10的作用，抑制电极组件10散开。
请参阅图23和24，电极组件10还可包括第三绝缘层17，第三绝缘层 17设置于第二表面103并固定电极组件10的最外圈的极片11的端部。
在一些实施方式中，第一绝缘层20和第二绝缘层30设置的位置不仅限于上述情形。例如：请参阅图25，第一绝缘层20还可自第一部分106延伸至第一表面101且未至第二部分107，第二绝缘层30还可自第一部分106延伸至第一表面101且未至第二部分107。第一表面101与第一部分106相交于第二边18。进一步地，从第三方向Z来看，第一绝缘层20可自第二边18沿第一表面101朝第二部分107延伸并且未至第二部分107；第二绝缘层30可自第二边18沿第一表面101朝第二部分107延伸并且未至第二部分107。又如：请参阅图26，第一绝缘层20自第二部分107延伸至第一表面101且未至第二部分106；第二绝缘层30自第一部分106延伸至第一表面101且未至第二部分107，此时，第一方向X为垂直于第二部分107所在的方向。
在一些实施方式中，电极组件10还可为堆叠结构。
在一些实施方式中，请参阅图24和图27，第四粘接部70还可设置于第二表面103，且还可设置于第三绝缘层17上。当第一绝缘层20和第二绝缘层30延伸至第二表面103时，第一粘接部40、第二粘接部50、第三粘接部60同样可对应位于第二表面103的第一绝缘层20和第二绝缘层30设置。
上述电池100的制造方法，其包括以下步骤：提供电极组件10；在电极组件10上粘贴第一绝缘层20和第二绝缘层30；通过例如但不限于网印、喷枪点胶等方式在电极组件10的表面形成第一粘接部40；将上述设有第一粘接部40、第一绝缘层20、第二绝缘层30和第三绝缘层17的电极组件10容置于壳体80中；而后压制壳体80的外侧，使得第一粘接部40与壳体80的内侧粘接。
电池100的制造方法还可包括：在形成第一粘接部40之前，在电极组件10上粘贴第三绝缘层17。优选的，在电极组件10上粘贴第一绝缘层20和第二绝缘层30之前在电极组件10上粘贴第三绝缘层17。
电池100的制造方法还可包括：在将的电极组件10容置于壳体80内之前，还可通过例如但不限于网印、喷枪点胶等方式在第一绝缘层20和第二绝缘层30中至少一个的表面形成第二粘接部50。而在压制壳体80的外侧后，第二粘接部50与壳体80的内侧粘接。
电池100的制造方法还可包括：在将的电极组件10容置于壳体80内之前，还可通过例如但不限于网印、喷枪点胶等方式在第一绝缘层20和第二 绝缘层30中至少一个的表面以及电极组件10的表面形成第三粘接部60。而在压制壳体80的外侧后，第三粘接部60与壳体80的内侧粘接。
电池100的制造方法还可包括：在将的电极组件10容置于壳体80内之前，还可通过例如但不限于网印、喷枪点胶等方式在电极组件10的表面形成第四粘接部70。而在压制壳体80的外侧后，第四粘接部70与壳体80的内侧粘接。
下面通过具体实施例及对比例进行进一步说明。其中，应用于各实施例及对比例中的电极组件10的结构和型号均相同。
对比例1
请参阅图28，电极组件的表面不设粘接部，在电极组件上设置第一绝缘层和第二绝缘层，第一绝缘层和第二绝缘层分别自第一表面经过第二部分延伸至第二表面以固定电极组件。壳体(铝塑膜)收容电极组件并通过粘接部与电极组件固定，注入电解液并将壳体密封后得到电池，对电池进行化成处理后再进行标准的充放电流程对电池进行容量激活，最后对电池脱气处理完成制备。
对比例2
请参阅图29，对比例2与对比例1的不同之处在于，在电极组件的第一表面位于第一绝缘层和第二绝缘层背离第二部分的一侧的第一区域上设置粘接部。
实施例1
请参阅图30，实施例1与对比例2的不同之处在于，粘接部还设置于电极组件的第一表面除设有第一绝缘层和第二绝缘层的区域以及第一区域以外的第二区域，即第二区域包括第一绝缘层和第二绝缘层之间的区域、第一绝缘层背离第二绝缘层的一侧的区域以及第二绝缘层背离第一绝缘层一侧的区域。
实施例2
请参阅图31，实施例2与实施例1的不同之处在于，粘接部还设置于第一绝缘层背离第一表面的表面和第一表面的交界处、第一绝缘层背离第一表面的表面、第二绝缘层背离第一表面的表面和第一表面的交界处以及第二绝缘层背离第一表面的表面。
实施例3
请参阅图32，实施例3与对比例2的不同之处在于，粘接部还设置于电极组件的第一表面位于第一绝缘层和第二绝缘层之间的区域。
实施例4
请参阅图33，实施例4与对比例1的不同之处在于，粘接部仅设置于电极组件的第一表面位于第一绝缘层和第二绝缘层之间的区域。
在常温下以0.2C的电流对对比例1-2及实施例1-4的电池进行充电，并在满充后测量电池厚度；而后将上各电池放电至截止电压，再以0.8C的电流恒流恒压充至限制电压后测量电池各区域的厚度作为初始厚度(此处为电池设有第一绝缘层的区域的厚度D1或电池设有第二绝缘层的区域的厚度D2、电池在第一绝缘层和第二绝缘层之间的区域的厚度D3，请参见图34；其中，未设第一绝缘层和第二绝缘层的对比例1的电池测量的区域与设有第一绝缘层和第二绝缘层的对比例/实施例的电池测量的区域对应)，并计算D3与D1的差值或者D3与D2的差值△D，记录于下表1中。而后对电池以0.8C/1C的充放电方式循环700次，并在循环700次后再次测量上述各区域的厚度，即循环后的厚度，并计算D3与D1的差值或者D3与D2的差值△D，记录于下表1中。
表1
Figure PCTCN2020082592-appb-000004
由上述数据可知，设置第一绝缘层和第二绝缘层能够抑制电池的膨胀。在电池充放电循环后，第一绝缘层和第二绝缘层之间设有粘接部的电池的形变量明显小于第绝缘层和第二绝缘层未设由粘接部的电池的形变量。
定义电极组件的连接区中连接第一部分(即头部)和第二部分(即底部) 的两相背的表面分别为第三部分和第四部分。在常温下以0.2C的电流对对比例1-2及实施例1-4的电池充电至限制电压后对电池进行跌落测试，具体为：将电池通过专用胶固定于电池专用跌落测试盒中，机械臂抓取带有电池的跌落测试盒并在1.8m的高度按预设的跌落方式释放跌落至大理石板上，其中，预设的跌落方式为每一轮按第一表面朝下→第二表面朝下→第一部分朝下→第三部分朝下→第二部分朝下→第四部分朝下的顺序跌落六次。每一轮跌落后观察电池表面(即铝塑膜)是否破损，并测量电池的开路电压。若电池的开路电压小于3.0V则电池失效，若电池表面即铝塑膜破损，同样判定电池失效。每组对比例或实施例每一轮分别测试5个电池取平均值，在表2中记录每个电池失效时的跌落轮数、失效原因以及失效时电池的破损情况。
表2
Figure PCTCN2020082592-appb-000005
由上述数据可知，在第一绝缘层和第二绝缘层之间的区域设置粘接部相较于不设置粘接部更有利于电池跌落失效的改善，从而更有利于提高电池的安全性。其次，设置第一绝缘层和第二绝缘层的同时设置粘接部能够改善电池的跌落失效情况，有利于提高电池的安全性。
本申请的电池，其在电极组件的表面设置第一绝缘层和第二绝缘层，并在第一绝缘层和第二绝缘层之间设置第一粘接部，壳体封装电极组件时，第一粘接部粘接电极组件和壳体，在电池受到外力作用时，有利于降低电极组件对壳体的破坏，同时有利于保护电极组件本身，从而有利于提高电池的安全性，延长电池的使用寿命。
另外，对于本领域的普通技术人员来说，可以根据本申请的技术构思做 出其它各种相应的改变与变形，而所有这些改变与变形都应属于本申请的保护范围。

Claims (22)

  1. 一种电池，包括：
    电极组件，包括第一表面以及与所述第一表面相背设置的第二表面；
    第一绝缘层，设置于所述第一表面；
    第二绝缘层，设置于所述第一表面，且与所述第一绝缘层沿一第一方向间隔设置；以及
    第一粘接部，其中，所述第一粘接部设置于所述第一表面，并位于所述第一绝缘层和所述第二绝缘层之间的区域。
  2. 如权利要求1所述的电池，其中，所述第一粘接部在所述第一表面的正投影的面积小于所述第一绝缘层和所述第二绝缘层在所述第一表面的正投影的总面积。
  3. 如权利要求2所述的电池，其中，所述第一粘接部在所述第一表面的正投影的面积小于所述第一绝缘层在所述第一表面的正投影的面积，并且小于所述第二绝缘层在所述第一表面的正投影的面积。
  4. 如权利要求1所述的电池，其中，从垂直于所述第一表面的方向上观察，所述第一表面与所述第一绝缘层重叠的部分区域至所述第二表面的距离为第一距离，所述第一粘接部至所述第二表面的距离为第二距离，所述第一距离小于所述第二距离。
  5. 如权利要求4所述的电池，其中，所述第一距离为所述第一表面与所述第一绝缘层对应的端部处至所述第二表面的距离。
  6. 如权利要求4所述的电池，其中，从垂直于所述第一表面的方向上观察，所述第一表面与所述第二绝缘层重叠的部分区域至所述第二表面的距离为第三距离，所述第三距离小于所述第二距离。
  7. 如权利要求6所述的电池，其中，所述第三距离为所述第一表面与所述第二绝缘层对应的端部处至所述第二表面的距离。
  8. 如权利要求6所述的电池，其中，所述第一距离与所述第三距离不相等。
  9. 如权利要求1所述的电池，其中，所述第一粘接部在所述第一方向上的长度小于所述第一表面在所述第一方向上的长度的一半。
  10. 如权利要求1所述的电池，其中，所述第一表面对应所述第一粘接部设有第一凹槽，所述第一粘接部位于所述第一凹槽中。
  11. 如权利要求10所述的电池，其中，所述第一粘接部为两个或两个以上，每一所述第一粘接部位于一所述第一凹槽中。
  12. 如权利要求1所述的电池，其中，所述电池还包括第二粘接部，所述第二粘接部设置于所述第一绝缘层背离所述第二表面的表面，且所述第二粘接部在所述第一表面的正投影的面积小于所述第一绝缘层在所述第一表面的正投影的面积。
  13. 如权利要求12所述的电池，其中，所述第一粘接部呈点阵分布，以及/或者所述第二粘接部呈点阵分布。
  14. 如权利要求12所述的电池，其中，所述第一绝缘层对应所述第二粘接部的表面设有第二凹槽，每一第二粘接部位于所述第二凹槽中。
  15. 如权利要求1所述的电池，其中，所述电极组件还包括连接所述第一表面和所述第二表面的连接区，所述第一绝缘层自所述第一表面延伸至所述连接区，所述第二绝缘层自所述第一表面延伸至所述连接区。
  16. 如权利要求15所述的电池，其中，所述第一绝缘层和所述第二绝缘层位于所述电极组件的同一侧。
  17. 如权利要求16所述的电池，其中，所述电极组件还包括金属部，所述连接区包括第一部分和与所述第一部分相背的第二部分，所述金属部设置于所述第一部分，所述第一绝缘层和所述第二绝缘层延伸至所述第二部分。
  18. 如权利要求1所述的电池，其中，所述电池还包括第三粘接部，所述第三粘接部设置于所述第一绝缘层背离所述第二表面的表面，并延伸至所述第一表面未设所述第一绝缘层的区域。
  19. 如权利要求1所述的电池，其中，所述电池还包括第四粘接部，所述第四粘接部设置于所述第一表面，所述第一表面设有所述第四粘接部的区 域与所述第一表面设有所述第一绝缘层和所述第二绝缘层的区域以及所述第一表面位于所述第一绝缘层和所述第二绝缘层之间的区域间隔，且所述第四粘接部不与所述第一绝缘层和所述第二绝缘层接触。
  20. 如权利要求19所述的电池，其中，从垂直于所述第一表面的方向上观察，所述电极组件包括至少两个形状不同的第四粘接部。
  21. 如权利要求1所述的电池，其中，所述电极组件还包括第三绝缘层，所述电极组件为卷绕结构，所述第三绝缘层设置于所述第二表面并固定所述电极组件的最外圈极片的端部。
  22. 如权利要求1所述电池，其中，所述电池还包括壳体，所述壳体包裹所述电极组件、所述第一绝缘层及所述第二绝缘层，并通过所述第一粘接部与所述电极组件粘接。
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