WO2021174418A1 - 电池 - Google Patents

电池 Download PDF

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Publication number
WO2021174418A1
WO2021174418A1 PCT/CN2020/077640 CN2020077640W WO2021174418A1 WO 2021174418 A1 WO2021174418 A1 WO 2021174418A1 CN 2020077640 W CN2020077640 W CN 2020077640W WO 2021174418 A1 WO2021174418 A1 WO 2021174418A1
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WIPO (PCT)
Prior art keywords
area
bending
tab
blank
close
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Application number
PCT/CN2020/077640
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English (en)
French (fr)
Inventor
马文涛
夏恒涛
徐春瑞
郑建明
Original Assignee
宁德新能源科技有限公司
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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/CN2020/077640 priority Critical patent/WO2021174418A1/zh
Priority to EP20923657.9A priority patent/EP3968429A4/en
Priority to CN202080004462.4A priority patent/CN113316861B/zh
Priority to JP2021512546A priority patent/JP7101873B2/ja
Publication of WO2021174418A1 publication Critical patent/WO2021174418A1/zh
Priority to US17/708,986 priority patent/US20220223923A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • 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
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0567—Liquid materials characterised by the additives
    • 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
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0569—Liquid materials characterised by the solvents
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/471—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof
    • H01M50/474—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof characterised by their position inside the cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2300/00—Electrolytes
    • H01M2300/0017—Non-aqueous electrolytes
    • H01M2300/0025—Organic electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2300/00—Electrolytes
    • H01M2300/0017—Non-aqueous electrolytes
    • H01M2300/0025—Organic electrolyte
    • H01M2300/0028—Organic electrolyte characterised by the solvent
    • H01M2300/0037—Mixture of solvents
    • H01M2300/0042—Four or more solvents
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2300/00—Electrolytes
    • H01M2300/0017—Non-aqueous electrolytes
    • H01M2300/0048—Molten electrolytes used at high temperature
    • H01M2300/0051—Carbonates
    • 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 the field of electrochemistry, in particular to a battery.
  • Lithium batteries are widely used in portable electronic devices because of their high voltage, high specific energy, and many cycles of use. Therefore, with the rapid development of portable electronic devices, the requirements for batteries have also increased.
  • most of the current wound cells have the problem of poor interface flatness, which affects the current density distribution inside the cells.
  • 1,3-propane sultone (PS) which is used as a film-forming additive in the electrolyte, is a carcinogen. If it is completely removed from the electrolyte, it will cause film formation on the anode and cathode. This will affect the cycle performance and high-temperature storage performance of the battery; if a new film-forming additive is developed to replace 1,3-propane sultone, it will greatly increase the manufacturing cost of the battery.
  • a battery includes an electrode assembly, a packaging bag containing the electrode assembly, an electrolyte contained in the packaging bag, a first tab and a second tab, and the electrode assembly is composed of stacked first tabs And a second pole piece formed by winding, the first pole piece including a first current collector and a first active material layer respectively disposed on both sides of the first current collector;
  • the electrolyte includes a lithium salt, an organic ester solvent and a film-forming additive, the film-forming additive includes 1,3-propane sultone, and the 1,3-propane sultone in the electrolyte
  • the mass fraction is 0%-1%;
  • the first current collector includes a first blank area, a first single-sided area, and a first double-sided area that are sequentially arranged, and the first blank area includes the winding start end of the first pole piece to the first blank area.
  • the first single-sided area includes a second bending area and is connected to the first bending area.
  • the first tab is disposed in the first plane area, and the second tab is disposed in the second pole piece;
  • the battery further includes a first filler, the first filler is disposed in the first plane area or the second plane area, the first filler, the first tab, and the second The projections of the tabs in the thickness direction of the electrode assembly do not overlap.
  • the second pole piece includes a second current collector and a second active material layer respectively arranged on both sides of the second current collector, and the second current collector includes a second blank area and a second current collector arranged in sequence.
  • the second blank area includes a third plane area from the winding start end of the second pole piece to the first bend of the second pole piece and connecting the third plane area
  • the third bending area is opposite to the first planar area
  • the third bending area is opposite to the second bending area
  • the second tab is disposed on the first Three-plane area.
  • the first filling member includes a first filling part, a second filling part, and a third filling part, the first filling part is disposed in the first bending area, and the second filling part is disposed in the In the second plane area, the third filling portion is disposed in the second bending area.
  • the first tab includes a first end close to the first bending area and a second end facing away from the first end
  • the second tab includes a first end close to the first bending area.
  • the distance is 0mm-4mm
  • the vertical distance from one end of the second filling part close to the first bending zone to the fourth end is 0mm-4mm
  • the second filling part close to the second bending zone The vertical distance from one end to the first end is 0mm-4mm
  • the vertical distance from one end of the third filling portion close to the first bending area to the second end is 0mm-4mm.
  • the second current collector further includes a second single-sided area connected to the second double-sided area and a third blank area connected to the second single-sided area, the second single-sided area And the third blank area is located on the outermost circle of the electrode assembly, the second single-sided area includes a fourth bending area opposite to the second bending area, and the third blank area includes The fifth bending area is opposite to the first bending area.
  • the battery further includes a second filler, the second filler includes a fourth filler and a fifth filler, the fourth filler is disposed in the fourth bending region, and the second filler includes a fourth filler and a fifth filler.
  • Five filling parts are arranged in the fifth bending zone, and the fourth filling part, the fifth filling part, the first tab and the second tab are arranged in the thickness direction of the electrode assembly. The projections do not overlap.
  • the first tab includes a first end close to the first bending area and a second end facing away from the first end
  • the second tab includes a first end close to the first bending area.
  • the battery further includes a second filler, the first filler includes a first section, a second section, and a third section, and the second filler includes a second section connected to the first section.
  • the fourth division between the second division and the second division and the fifth division connected to the second division and the third division, and the fourth division is arranged on the first plane Area facing away from the surface of the first tab, the fifth sub-portion is provided on the surface of the first planar area facing away from the second tab, the first sub-portion and the second sub-portion It is arranged in the first plane area, and the third sub-section is arranged in the first bending area.
  • the thickness A1 of the first subsection satisfies the formula: A1-B-C ⁇ 20 ⁇ m;
  • the thickness A2 of the second subsection satisfies the formula: A2-B-C ⁇ 20 ⁇ m;
  • the thickness A3 of the third subsection satisfies the formula: A3-B-D ⁇ 20 ⁇ m;
  • B is the thickness of the first tab
  • C is the thickness of the fourth subsection
  • D is the thickness of the fifth subsection.
  • the battery further includes a third filler that includes a first blank current collector opposite to the first bending area and a second blank current collector opposite to the first bending area A current collector, the first blank current collector is arranged at an end of the first plane area away from the first bending zone, and is bent relative to the first plane zone; the second blank current collector is arranged at the end One end of the first double-sided area away from the first blank area and bent relative to the first double-sided area; the first blank current collector, the second blank current collector, and the first tab It does not overlap with the projection of the second tab in the thickness direction of the electrode assembly.
  • a third filler that includes a first blank current collector opposite to the first bending area and a second blank current collector opposite to the first bending area A current collector, the first blank current collector is arranged at an end of the first plane area away from the first bending zone, and is bent relative to the first plane zone; the second blank current collector is arranged at the end One end of the first double-sided area away from the first blank area and bent relative to the
  • the first tab includes a first end close to the first bending area and a second end facing away from the first end
  • the second tab includes a first end close to the first bending area.
  • the vertical distance is 0mm-4mm
  • the vertical distance from one end of the second blank current collector close to the first bending area to the second end is 0mm-4mm.
  • the first filler includes a first coating, a second coating, a third coating, and a fourth coating.
  • the first coating is disposed in the first plane area
  • the second The coating is disposed in the first bending area
  • the third coating is disposed in the second plane area
  • the fourth coating is disposed in the second bending area.
  • the first tab includes a first end close to the first bending area and a second end facing away from the first end
  • the second tab includes a first end close to the first bending area.
  • the distance is 0mm-4mm
  • the vertical distance from one end of the first coating away from the first bending zone to the first end is 0mm-4mm
  • the second coating is close to the second bending zone
  • the vertical distance from one end of the third coating layer to the third end is 0mm-4mm
  • the vertical distance from the end of the third coating layer close to the first bending zone to the fourth end is 0mm-4mm
  • the third coating layer The vertical distance from the end far away from the first bending zone to the first end is 0mm-4mm
  • the vertical distance from the end of the fourth coating layer close to the first bending zone to the second end is
  • the organic ester solvent includes ethylene carbonate, propylene carbonate, ethyl methyl carbonate and diethyl carbonate, and the mass fraction of the ethylene carbonate in the electrolyte is 5%-23% ,
  • the mass fraction of the propylene carbonate in the electrolyte is 0%-30%
  • the mass fraction of the ethyl methyl carbonate in the electrolyte is 0%-60%
  • the mass fraction of diethyl ester is 0%-60%.
  • the film-forming additives further include vinylene carbonate, halogenated carbonate and lithium difluorophosphate, the mass fraction of the vinylene carbonate in the electrolyte is 0%-2%, and the electrolysis The mass fraction of the halogenated carbonate in the solution is 0%-4%, and the mass fraction of the lithium difluorophosphate in the electrolyte is 0%-2%.
  • PS is a carcinogenic substance and is included in the SVHC list of substances of high concern by the EU Reach regulations. Toys and other products that come into direct contact with children pay special attention to the content of PS, and environmentally friendly lithium-ion batteries with low PS content The demand is urgent, but PS is an excellent film-forming additive. Insufficient PS will affect the solid electrolyte interface membrane (Solid Electrolyte Interface, SEI) film formation, affecting the battery cycle and high-temperature storage performance.
  • SEI Solid Electrolyte Interface
  • Film-forming additives such as halogenated carbonate and lithium difluorophosphate strengthen the formation of anode and cathode, and make up for the insufficient film formation of SEI film due to the decrease of PS content.
  • the formation of SEI includes two processes of crystal nucleus formation and growth.
  • the crystal nucleus formation rate is fast, resulting in a loose structure of the SEI film and weak adhesion on the surface of the negative electrode.
  • the internal structure of the electrode assembly is unevenly distributed, different internal positions are subjected to different forces during formation, the current density distribution is uneven, and the local current density is too large, making the formed SEI film loose, unstable and poorly consistent.
  • the present application compensates for the difference in thickness between the tab portion and the non-tab portion formed by the arrangement of the first tab and the second tab through the arrangement of the first filler, thereby improving the internal thickness of the electrode assembly.
  • the flatness of the structure further promotes the uniform distribution of the current density inside the electrode assembly, which is conducive to the formation of a consistent and stable SEI film.
  • FIG. 1 is a schematic diagram of the structure of a battery according to an embodiment of the application.
  • FIG. 2 is a schematic diagram of the structure of the electrode assembly shown in FIG. 1.
  • FIG. 3 is a schematic diagram of the structure of the first pole piece shown in FIG. 2.
  • FIG. 4 is a schematic diagram of the structure of the second pole piece shown in FIG. 2.
  • FIG. 5 is a schematic diagram of the structure of an electrode assembly according to an embodiment of the application.
  • FIG. 6 is a schematic diagram of the structure of the first pole piece shown in FIG. 5.
  • FIG. 7 is a schematic structural diagram of an electrode assembly according to another embodiment of the application.
  • FIG. 8 is a schematic structural diagram of an electrode assembly according to another embodiment of this application.
  • FIG. 9 is a schematic diagram of the structure of the first pole piece shown in FIG. 8.
  • FIG. 10 is a schematic structural diagram of a battery according to another embodiment of the application.
  • the first active material layer 112 is the first active material layer 112
  • the first blank area 113 The first blank area 113
  • the third plane area 1231 is the third plane area 1231
  • the first filling department 601a The first filling department 601a
  • the second filling department 602a The second filling department 602a
  • the third filling department 603a The third filling department 603a
  • the fourth filling department 701a The fourth filling department 701a
  • the third filler 80 is the third filler 80
  • the first blank current collector 801 The first blank current collector 801
  • the second bonding department 902 The second bonding department 902
  • the third bonding department 903 The third bonding department 903
  • the battery 100 includes an electrode assembly 10, a packaging bag 20 containing the electrode assembly 10, an electrolyte 30 contained in the packaging bag 20, a first tab 40, a second tab 50, and a first filler 60 .
  • the electrolyte 30 includes lithium salt, organic ester solvents and film-forming additives.
  • the film-forming additive includes 1,3-propane sultone (PS).
  • PS 1,3-propane sultone
  • the mass fraction of the 1,3-propane sultone is 0%-1%.
  • the organic ester solvent includes ethylene carbonate (EC), propylene carbonate (PC), ethyl methyl carbonate (EMC), and diethyl carbonate (DEC).
  • EC ethylene carbonate
  • PC propylene carbonate
  • EMC ethyl methyl carbonate
  • DEC diethyl carbonate
  • the mass fraction of the ethylene carbonate is 5%-23%
  • the mass fraction of the propylene carbonate is 0%-30%
  • the mass fraction of the ethyl methyl carbonate is It is 0%-60%
  • the mass fraction of the diethyl carbonate is 0%-60%.
  • the film-forming additives further include vinylene carbonate (VC), halogenated carbonate (FEC) and lithium difluorophosphate (LiPO 2 F 2 ).
  • VC vinylene carbonate
  • FEC halogenated carbonate
  • LiPO 2 F 2 lithium difluorophosphate
  • the electrode assembly 10 is formed by winding a first pole piece 11 and a second pole piece 12 that are stacked.
  • the first tab 40 is disposed on the first pole piece 11
  • the second tab 50 is disposed on the second pole piece 12.
  • the first pole piece 11 includes a first current collector 111 and a first active material layer 112 respectively disposed on both sides of the first current collector 111.
  • the first current collector 111 includes a first blank area 113, a first single-sided area 114 and a first double-sided area 115 arranged in sequence.
  • the first active material layer 112 is not provided on both sides of the first blank area 113, and the first active material layer 112 is not provided on the surface of the first single-sided area 114 facing the center of the electrode assembly 10 (see FIG. 3).
  • the first active material layer 112 is provided on both sides of the first double-sided region 115.
  • the first blank area 113 includes a first plane area 1131 from the winding start end of the first pole piece 11 to the first bend of the first pole piece 11 and connecting the first plane area 1131 A first bending area 1132 of a plane area 1131.
  • the first single-sided area 114 includes a second bending area 1141 and a second plane area 1142 connected between the first bending area 1132 and the second bending area 1141.
  • the second planar area 1142 is opposite to the first planar area 1131, and the second bending area 1141 is opposite to the first bending area 1132.
  • the first tab 40 is disposed in the first plane area 1131.
  • the first tab 40 is disposed on the surface of the first planar area 1131 facing away from the center of the electrode assembly 10;
  • the first tab 40 is disposed on the surface of the first planar area 1131 facing the center of the electrode assembly 10.
  • the second pole piece 12 includes a second current collector 121 and a second active material layer 122 respectively disposed on both sides of the second current collector 121.
  • the second current collector 121 includes a second blank area 123 and a second double-sided area 124 arranged in sequence. Wherein, the second active material layer 122 is not provided on both sides of the second blank area 123, and the second active material layer 122 is provided on both sides of the second double-sided area 124.
  • the second blank area 123 includes a third plane area 1231 from the winding start end of the second pole piece 12 to the first bend of the second pole piece 12, and a third plane area 1231 connected to the second pole piece 12
  • the third bending area 1232 of the three-plane area 1231 is opposite to the first planar area 1131, and the third bending area 1232 is opposite to the second bending area 1141.
  • the second tab 50 is disposed in the third plane area 1231.
  • the second tab 50 is disposed on the surface of the third plane area 1231 facing away from the center of the electrode assembly 10;
  • the second tab 50 is disposed on the surface of the third plane area 1231 facing the center of the electrode assembly 10.
  • the second current collector 121 further includes a second single-sided area 125 connected to the second double-sided area 124 and a third blank area 126 connected to the second single-sided area 125 .
  • the second single-sided area 125 and the third blank area 126 are located at the outermost circle of the electrode assembly 10.
  • the second active material layer 122 is not provided on the surface of the second single-sided region 125 opposite to the center of the electrode assembly 10, and the second active material layer 122 is not provided on both sides of the third blank region 126.
  • the second single-sided area 125 includes a fourth bending area 1251 opposite to the second bending area 1141.
  • the third blank area 126 includes a fifth bending area 1261 opposite to the first bending area 1132.
  • the first tab 40 includes a first end 401 close to the first bending area 1132 and a second end 402 opposite to the first end 401.
  • the second tab 50 includes a third end 501 close to the first bending area 1132 and a fourth end 502 opposite to the third end 501.
  • the first filler 60 is disposed in the first plane area 1131 or the second plane area 1142.
  • the projections of the first filler 60, the first tab 40 and the second tab 50 in the thickness direction of the electrode assembly 10 do not overlap.
  • the thickness difference between the tab portion and the non-tab portion formed by the arrangement of the first tab 40 and the second tab 50 is compensated, thereby improving the electrode.
  • the flatness of the structure inside the assembly 10 further promotes the uniform distribution of the current density inside the electrode assembly 10.
  • the first filler 60 may be green glue or hot melt glue.
  • the first filling member 60 includes a first filling part 601 a, a second filling part 602 a, and a third filling part 603 a.
  • the first filling part 601a is disposed in the first bending area 1132
  • the second filling part 602a is disposed in the second plane area 1142
  • the third filling part 603a is disposed in the second bending area. District 1141. In this way, through the arrangement of the second filling portion 602a, the thickness difference between the tab portion and the non-tab portion formed by the arrangement of the first tab 40 and the second tab 50 is compensated, thereby improving the electrode.
  • the flatness of the structure inside the assembly 10 further promotes the uniform distribution of the current density inside the electrode assembly 10.
  • the thickness difference in the bending area caused by the winding of the pole piece is compensated, thereby effectively improving the structural flatness of the electrode assembly 10 , which further promotes the uniform distribution of the current density inside the electrode assembly 10.
  • the first filling portion 601a is close to the second bending area 1141 and is perpendicular to the third end 501.
  • the distance d1 is 0mm-4mm
  • the vertical distance d2 from the end of the second filling portion 602a close to the first bending area 1132 to the fourth end 502 is 0mm-4mm
  • the second filling portion 602a is close to the
  • the vertical distance d3 from one end of the second bending area 1141 to the first end 401 is 0mm-4mm
  • the third filling portion 603a is close to the end of the first bending area 1132 to the second end 402
  • the vertical distance d4 is 0mm-4mm.
  • the battery 100 further includes a first bonding portion 901 and a second bonding portion 902.
  • the first bonding portion 901 covers the first tab 40.
  • the second bonding portion 902 is disposed in the first single-sided area 114 and located on the side of the third filling portion 603a away from the second filling portion 602a.
  • the arrangement of the first bonding portion 901 and the second bonding portion 902 is used to protect the isolation film 13, so as to avoid occurrence of the isolation film caused by burrs on the first tab 40 and the first current collector 111 13 The problem of being pierced.
  • the battery 100 further includes a second filler 70.
  • the second filler 70 includes a fourth filler 701a and a fifth filler 702a.
  • the fourth filling portion 701 a is disposed in the fourth bending area 1251
  • the fifth filling portion 702 a is disposed in the fifth bending area 1261.
  • the projections of the fourth filling portion 701a, the fifth filling portion 702a, the first tab 40 and the second tab 50 on the electrode assembly 10 do not overlap. In this way, through the arrangement of the second filler 70, the thickness difference in the bending area caused by the winding of the pole pieces is compensated, thereby effectively improving the flatness of the structure inside the electrode assembly 10, and further promoting the inside of the electrode assembly 10. Uniform distribution of current density.
  • the second filler 70 may be green glue or hot melt glue.
  • the vertical distance d1 from one end of the fourth filling portion 701a close to the second bending area 1141 to the third end 501 is 0mm-4mm
  • the vertical distance d4 from an end of the fifth filling portion 702a close to the first bending area 1132 to the second end 402 is 0 mm-4 mm.
  • the battery 100 further includes a third bonding portion 903, a fourth bonding portion 904 and a fifth bonding portion 905.
  • the third bonding portion 903 covers the second tab 50.
  • the fourth bonding portion 904 is disposed in the second single-sided area 125 and is located on the side of the fourth filling portion 701a away from the fifth filling portion 702a.
  • the fifth bonding portion 905 is disposed on the surface of the third blank area 126 facing away from the fifth filling portion 702a.
  • the third bonding portion 903, the fourth bonding portion 904, and the fifth bonding portion 905 are arranged to protect the isolation film 13, so as to avoid the occurrence of the second tab 50 and the second set. The burrs on the fluid 121 cause the isolation membrane 13 to be punctured.
  • the first filler 60 includes a first section 601b, a second section 602b, and a third section 603b.
  • the battery 100 further includes a second filler 70.
  • the second filler 70 includes a fourth section 701b connected between the first section 601b and the second section 602b, and a fourth section 701b connected between the second section 602b and the third section
  • the fifth division 702b between 603b.
  • the fourth subsection 701b is disposed on the surface of the first planar area 1131 facing away from the first tab 40
  • the fifth subsection 702b is disposed on the first planar area 1131 facing away from the second tab 40.
  • the surface of the tab 50 is disposed on the surface of the first planar area 1131 facing away from the first tab 40.
  • the first part 601 b and the second part 602 b are disposed in the first plane area 1131, and the third part 603 b is disposed in the first bending area 1132.
  • the compensation caused by the first tab 40 and the second tab improves the flatness of the structure inside the electrode assembly 10, and further promotes the uniform distribution of the current density inside the electrode assembly 10.
  • the thickness difference in the bending area caused by the winding of the pole pieces is compensated, thereby effectively improving the flatness of the structure inside the electrode assembly 10, and further promoting the inside of the electrode assembly 10. Uniform distribution of current density.
  • the thickness A1 of the first subsection 601b satisfies the formula: A1-B-C ⁇ 20 ⁇ m;
  • the thickness A2 of the second subsection 602b satisfies the formula: A2-B-C ⁇ 20 ⁇ m;
  • the thickness A3 of the third subsection 603b satisfies the formula: A3-B-D ⁇ 20 ⁇ m;
  • B is the thickness of the first tab 40
  • C is the thickness of the fourth section 701b
  • D is the thickness of the fifth section 702b.
  • the battery 100 further includes a third filler 80.
  • the third filler 80 includes a first blank current collector 801 opposite to the first bending area 1132 and a second blank current collector 802 opposite to the first bending area 1132.
  • the first blank current collector 801 is disposed at an end of the first flat area 1131 away from the first bending area 1132 and is bent relative to the first flat area 1131.
  • the second blank current collector 802 is disposed at an end of the first double-sided area 115 away from the first blank area 113 and is bent relative to the first double-sided area 115.
  • the projections of the first blank current collector 801, the second blank current collector 802, the first tab 40 and the second tab 50 in the thickness direction of the electrode assembly 10 do not overlap.
  • the arrangement of the third filler 80 compensates for the thickness difference in the bending area caused by the winding of the pole pieces, thereby effectively improving the flatness of the internal structure of the electrode assembly 10, and further promoting the internal current of the electrode assembly 10. Uniform distribution of density.
  • the vertical distance e1 from one end of the first blank current collector 801 close to the first bending area 1132 to the second end 402 is 0 mm-4 mm
  • the vertical distance e1 from one end of the second blank current collector 802 close to the first bending area 1132 to the second end 402 is 0 mm-4 mm.
  • the first filler 60 includes a first coating 601c, a second coating 602c, a third coating 603c, and a fourth coating 604c.
  • the first coating 601c is disposed in the first planar area 1131
  • the second coating 602c is disposed in the first bending area 1132
  • the third coating 603c is disposed in the second planar area 1142.
  • the fourth coating 604c is disposed in the second bending area 1141. In this way, through the arrangement of the first coating 601c and the third coating 603c, the gap between the tab portion and the non- tab portion formed by the arrangement of the first tab 40 and the second tab 50 is compensated.
  • the thickness difference of the electrode assembly 10 improves the flatness of the structure inside the electrode assembly 10, thereby promoting the even distribution of the current density inside the electrode assembly 10.
  • the thickness difference in the bending area caused by the winding of the pole piece is compensated, thereby effectively improving the flatness of the internal structure of the electrode assembly 10 , which further promotes the uniform distribution of the current density inside the electrode assembly 10.
  • the vertical distance f1 from one end of the first coating 601c close to the first bending area 1132 to the fourth end 502 is 0mm-4mm, and the first coating 601c
  • the vertical distance f2 from an end of a coating 601c away from the first bending zone 1132 to the first end 401 is 0mm-4mm
  • the second coating 602c is close to an end of the second bending zone 1141 to
  • the vertical distance f3 of the third end 501 is 0mm-4mm
  • the vertical distance f1 from the end of the third coating 603c close to the first bending area 1132 to the fourth end 502 is 0mm-4mm
  • the vertical distance f2 from one end of the third coating 603c away from the first bending zone 1132 to the first end 401 is 0mm-4mm
  • the fourth coating 604c is close to the first bending zone 1132.
  • the vertical distance f4 from one end to the second end 402 is 0 mm-4 mm.
  • the battery 100 includes an electrode assembly 10, a packaging bag 20 containing the electrode assembly 10, an electrolyte 30 contained in the packaging bag 20, a first tab 40, and a second tab. 50 and the first filler 60.
  • the electrolyte 30 includes a lithium salt, an organic ester solvent, and a film-forming additive.
  • the organic ester solvent includes ethylene carbonate (EC), propylene carbonate (PC), ethyl methyl carbonate (EMC) and diethyl carbonate (DEC).
  • EC ethylene carbonate
  • PC propylene carbonate
  • EMC ethyl methyl carbonate
  • DEC diethyl carbonate
  • the mass fraction of the ethylene carbonate is 5%-23%
  • the mass fraction of the propylene carbonate is 0%-30%
  • the mass fraction of the ethyl methyl carbonate is 0%. %-60%
  • the mass fraction of the diethyl carbonate is 0%-60%.
  • the film-forming additives include 1,3-propane sultone (PS), vinylene carbonate (VC), halogenated carbonate (FEC), and lithium difluorophosphate (LiPO 2 F 2 ).
  • PS 1,3-propane sultone
  • VC vinylene carbonate
  • FEC halogenated carbonate
  • LiPO 2 F 2 lithium difluorophosphate
  • the mass fraction of the 1,3-propane sultone is 0%-1%
  • the mass fraction of the vinylene carbonate is 0%-2%
  • the halogenated carbonic acid The mass fraction of the ester is 0%-4%
  • the mass fraction of the lithium difluorophosphate is 0%-2%.
  • the electrode assembly 10 is formed by winding a first pole piece 11 and a second pole piece 12 that are stacked.
  • the first pole piece 11 includes a first current collector 111 and a first active material layer 112 respectively disposed on both sides of the first current collector 111.
  • the first current collector 111 includes a first blank area 113, a first single-sided area 114, and a first double-sided area 115 arranged in sequence.
  • the first blank area 113 includes a first plane area 1131 from the winding start end of the first pole piece 11 to the first bend of the first pole piece 11, and a first plane area 1131 connected to the first pole piece 11 A first bending area 1132 of a plane area 1131.
  • the first single-sided area 114 includes a second bending area 1141 and a second plane area 1142 connected between the first bending area 1132 and the second bending area 1141.
  • the second planar area 1142 is opposite to the first planar area 1131, and the second bending area 1141 is opposite to the first bending area 1132.
  • the first tab 40 is disposed on the surface of the first planar area 1131 facing away from the center of the electrode assembly 10, and the second tab 50 is disposed on the second pole piece 12.
  • the first filler 60 includes a first coating 601c, a second coating 602c, a third coating 603c, and a fourth coating 604c.
  • the first coating 601c is disposed in the first planar area 1131
  • the second coating 602c is disposed in the first bending area 1132
  • the third coating 603c is disposed in the second planar area 1142.
  • the fourth coating 604c is disposed in the second bending area 1141.
  • the first tab 40 includes a first end 401 close to the first bending area 1132 and a second end 402 opposite to the first end 401.
  • the second tab 50 includes a third end 501 close to the first bending area 1132 and a fourth end 502 opposite to the third end 501.
  • the vertical distance from one end of the first coating 601c close to the first bending area 1132 to the fourth end 502 is 0mm-4mm, so The vertical distance from one end of the first coating 601c away from the first bending zone 1132 to the first end 401 is 0 mm-4mm, and the second coating 602c is close to one end of the second bending zone 1141
  • the vertical distance from the third end 501 to the third end 501 is 0mm-4mm
  • the vertical distance from the end of the third coating 603c close to the first bending area 1132 to the fourth end 502 is 0mm-4mm.
  • the vertical distance from the end of the third coating 603c away from the first bending area 1132 to the first end 401 is 0mm-4mm, and the fourth coating 604c is close to the end of the first bending area 1132 to The vertical distance of the second end 402 is 0 mm-4 mm.
  • first filler 60 in the second embodiment and the battery 100 in the second embodiment further include a second filler 70.
  • the first filler 60 includes a first section 601b, a second section 602b, and a third section 603b
  • the second filler 70 includes a The fourth subsection 701b between the first subsection 601b and the second subsection 602b and the fifth subsection connected between the second subsection 602b and the third subsection 603b.
  • the fourth subsection 701b is disposed on the surface of the first planar area 1131 facing away from the first tab 40
  • the fifth subsection 702b is disposed on the first planar area 1131 facing away from the second tab 40.
  • the surface of the tab 50 The first part 601 b and the second part 602 b are disposed in the first plane area 1131
  • the third part 603 b is disposed in the first bending area 1132.
  • the thickness A1 of the first subsection 601b satisfies the formula: A1-B-C ⁇ 20 ⁇ m;
  • the thickness A2 of the second subsection 602b satisfies the formula: A2-B-C ⁇ 20 ⁇ m;
  • the thickness A3 of the third subsection 603b satisfies the formula: A3-B-D ⁇ 20 ⁇ m;
  • B is the thickness of the first tab 40
  • C is the thickness of the fourth section 701b
  • D is the thickness of the fifth section 702b.
  • Embodiment 3 The difference between Embodiment 3 and Embodiment 1 is that the first filler 60 in Embodiment 3 and the battery 100 in Embodiment 3 further include a second filler 70.
  • the second pole piece 12 includes a second current collector 121 and a second active material layer 122 respectively disposed on both sides of the second current collector 121.
  • the second current collector 121 includes a second blank area 123, a second double-sided area 124, a second single-sided area 125, and a third blank area 126 sequentially arranged. Wherein, the second single-sided area 125 and the third blank area 126 are located at the outermost circle of the electrode assembly.
  • the second blank area 123 includes a third plane area 1231 from the winding start end of the second pole piece 12 to the first bend of the second pole piece 12 and the connection The third bending area 1232 of the third plane area 1231.
  • the third planar area 1231 is opposite to the first planar area 1131, and the third bending area 1232 is opposite to the first bending area 1132.
  • the second tab 50 is disposed on the surface of the third plane area 1231 facing away from the center of the electrode assembly 10.
  • the second single-sided area 125 includes a fourth bending area 1251 opposite to the second bending area 1141.
  • the third blank area 126 includes a fifth bending area 1261 opposite to the first bending area 1132.
  • the first filling member 60 includes a first filling part 601a, a second filling part 602a, and a third filling part 603a.
  • the first filling part 601a is disposed in the first bending area 1132
  • the second filling part 602a is disposed in the second plane area 1142
  • the third filling part 603a is disposed in the second bending area. District 1141.
  • the vertical distance from one end of the first filling portion 601a close to the second bending area 1141 to the third end 501 is 0mm-4mm
  • the second filling portion 601a The vertical distance from the end of the portion 602a close to the first bending area 1132 to the fourth end 502 is 0 mm-4 mm
  • the end of the second filling portion 602a close to the second bending area 1141 to the first bending area 1141 The vertical distance between one end 401 is 0 mm-4 mm
  • the vertical distance from one end of the third filling portion 603 a close to the first bending area 1132 to the second end 402 is 0 mm-4 mm.
  • the second filling member 70 includes a fourth filling part 701a and a fifth filling part 702a.
  • the fourth filling portion 701 a is disposed in the fourth bending area 1251
  • the fifth filling portion 702 a is disposed in the fifth bending area 1261.
  • the projections of the fourth filling portion 701a, the fifth filling portion 702a, the first tab 40 and the second tab 50 on the electrode assembly 10 do not overlap.
  • the vertical distance from one end of the fourth filling portion 701a close to the second bending area 1141 to the third end 501 is 0mm-4mm
  • the fifth The vertical distance from one end of the filling portion 702a close to the first bending area 1132 to the second end 402 is 0 mm-4 mm.
  • first filler 60 in the fourth embodiment and the battery 100 in the fourth embodiment further include a third filler 80.
  • the first filler 60 is disposed in the first plane area 1131 or the second plane area 1142.
  • the third filler 80 includes a first blank current collector 801 opposite to the first bending area 1132 and a second blank current collector 802 opposite to the first bending area 1132.
  • the first blank current collector 801 is disposed at an end of the first flat area 1131 away from the first bending area 1132 and is bent relative to the first flat area 1131.
  • the second blank current collector 802 is disposed at an end of the first double-sided area 115 away from the first blank area 113 and is bent relative to the first double-sided area 115.
  • the projections of the first blank current collector 801, the second blank current collector 802, the first tab 40 and the second tab 50 in the thickness direction of the electrode assembly 10 do not overlap.
  • the vertical distance from one end of the first blank current collector 801 close to the first bending area 1132 to the second end 402 is 0 mm-4 mm, and the first blank current collector 801 The vertical distance from one end of the two blank current collectors 802 close to the first bending area 1132 to the second end 402 is 0 mm-4 mm.
  • the electrolyte 30 includes a lithium salt, an organic ester solvent, and a film-forming additive.
  • the organic ester solvent includes ethylene carbonate (EC), propylene carbonate (PC), ethyl methyl carbonate (EMC) and diethyl carbonate (DEC).
  • the film-forming additives include 1,3-propane sultone (PS), vinylene carbonate (VC), halogenated carbonate (FEC), and lithium difluorophosphate (LiPO 2 F 2 ).
  • Comparative Example 1 and Examples 1-17 are listed in Table 1, and the test conditions and test results of the battery 100 using the electrolyte 30 in Comparative Example 1 and Examples 1-17 are listed in Table 1. Table 2.
  • the percentages shown in Table 1 are the mass fractions of PS, VC, FEC and LiPO 2 F 2 in the electrolyte 30.
  • the mass fraction of the ethylene carbonate is 5%-23%
  • the mass fraction of the propylene carbonate is 0%-30%
  • the mass fraction of the ethyl methyl carbonate is 0%.
  • %-60% the mass fraction of the diethyl carbonate is 0%-60%.

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Abstract

一种电池，包括电极组件、收容所述电极组件的包装袋、容纳于所述包装袋内的电解液、第一极耳、第二极耳及第一填充件。所述电极组件由叠置的第一极片和第二极片卷绕形成。所述电解液包括锂盐、有机酯类溶剂及成膜添加剂。所述成膜添加剂包括苯磺酸内酯，所述电解液中所述苯磺酸内酯的质量分数不大于1％。所述第一集流体包括第一空白区、第一单面区和第一双面区。所述第一空白区包括第一平面区及第一弯折区，所述第一单面区包括第二弯折区及第二平面区。所述第一极耳设置于第一平面区，所述第二极耳设置于第二极片。所述第一填充件设置于第一平面区或第二平面区。所述第一填充件、所述第一极耳和所述第二极耳在电极组件的厚度方向上的投影不重叠。

Description

电池 技术领域
本申请涉及电化学领域，具体涉及一种电池。
背景技术
锂电池由于其本身具有电压高、比能量高、循环使用次数多等优点，而被广泛应用至便携式电子设备中。因此，随着便携式电子设备的迅速发展，对电池的要求也随之提高。然而，目前卷绕电芯大多存在界面平整性不佳的问题，从而影响电芯内部的电流密度分布。此外，电解液中作为成膜添加剂的1,3-丙烷磺酸内酯(1,3-Propanesultone,PS)属于致癌物质，若将其从电解液中完全去除，又会对阴阳极成膜造成影响，从而影响到电池的循环性能及高温存储性能等；若重新开发一种成膜添加剂来替代1,3-丙烷磺酸内酯，又会大幅增加电池的制造成本。
发明内容
有鉴于此，有必要提供一种电池，以解决上述问题。
一种电池，包括电极组件、收容所述电极组件的包装袋、容纳于所述包装袋内的电解液、第一极耳及第二极耳，所述电极组件由叠置的第一极片和第二极片卷绕形成，所述第一极片包括第一集流体及分别设置于所述第一集流体两侧的第一活性物质层；
所述电解液包括锂盐、有机酯类溶剂及成膜添加剂，所述成膜添加剂包括1,3-丙烷磺酸内酯，所述电解液中所述1,3-丙烷磺酸内酯的质量分数为0％-1％；
所述第一集流体包括依次设置的第一空白区、第一单面区和第一双面区，所述第一空白区包括由所述第一极片的卷绕起始端到所述第一极片第一次弯折处的第一平面区及连接所述第一平面区的第一弯折区，所述第一单面区包括第二弯折区及连接于所述第一弯折区和所述第二弯折区之间的第二平面区，所述第二平面区和所述第 一平面区相对，所述第二弯折区与所述第一弯折区相对；
所述第一极耳设置于所述第一平面区，所述第二极耳设置于所述第二极片；
所述电池还包括第一填充件，所述第一填充件设置于所述第一平面区或所述第二平面区，所述第一填充件、所述第一极耳和所述第二极耳在所述电极组件的厚度方向上的投影不重叠。
可选地，所述第二极片包括第二集流体及分别设置于所述第二集流体两侧的第二活性物质层，所述第二集流体包括依次设置的第二空白区和第二双面区，所述第二空白区包括由所述第二极片的卷绕起始端到所述第二极片第一次弯折处的第三平面区及连接所述第三平面区的第三弯折区，所述第三平面区与所述第一平面区相对，所述第三弯折区与所述第二弯折区相对，所述第二极耳设置于所述第三平面区。
可选地，所述第一填充件包括第一填充部、第二填充部和第三填充部，所述第一填充部设置于所述第一弯折区，所述第二填充部设置于所述第二平面区，所述第三填充部设置于所述第二弯折区。
可选地，所述第一极耳包括靠近所述第一弯折区的第一端及背对所述第一端的第二端，所述第二极耳包括靠近所述第一弯折区的第三端及背对所述第三端的第四端；在所述电极组件的宽度方向上，所述第一填充部靠近所述第二弯折区的一端至所述第三端的垂直距离为0mm-4mm，所述第二填充部靠近所述第一弯折区的一端至所述第四端的垂直距离为0mm-4mm，所述第二填充部靠近所述第二弯折区的一端至所述第一端的垂直距离为0mm-4mm，所述第三填充部靠近所述第一弯折区的一端至所述第二端的垂直距离为0mm-4mm。
可选地，所述第二集流体还包括连接于所述第二双面区的第二单面区及连接于所述第二单面区的第三空白区，所述第二单面区和所述第三空白区位于所述电极组件的最外圈，所述第二单面区包括与所述第二弯折区相对的第四弯折区，所述第三空白区包括与所述第一弯折区相对的第五弯折区。
可选地，所述电池还包括第二填充件，所述第二填充件包括第 四填充部和第五填充部，所述第四填充部设置于所述第四弯折区，所述第五填充部设置于所述第五弯折区，所述第四填充部、所述第五填充部、所述第一极耳及所述第二极耳在所述电极组件的厚度方向上的投影不重叠。
可选地，所述第一极耳包括靠近所述第一弯折区的第一端及背对所述第一端的第二端，所述第二极耳包括靠近所述第一弯折区的第三端及背对所述第三端的第四端；在所述电极组件的宽度方向上，所述第四填充部靠近所述第二弯折区的一端至所述第三端的垂直距离为0mm-4mm，所述第五填充部靠近所述第一弯折区的一端至所述第二端的垂直距离为0mm-4mm。
可选地，所述电池还包括第二填充件，所述第一填充件包括第一分部、第二分部及第三分部，所述第二填充件包括连接于所述第一分部和所述第二分部之间的第四分部和连接于所述第二分部和所述第三分部的第五分部，所述第四分部设置于所述第一平面区背对所述第一极耳的表面，所述第五分部设置于所述第一平面区背对所述第二极耳的表面，所述第一分部和所述第二分部设置于所述第一平面区，所述第三分部设置于所述第一弯折区。
可选地，在所述电极组件的厚度方向上，
所述第一分部的厚度A1满足公式：A1-B-C≤20μm；
所述第二分部的厚度A2满足公式：A2-B-C≤20μm；
所述第三分部的厚度A3满足公式：A3-B-D≤20μm；
其中，B为所述第一极耳的厚度，C为第四分部的厚度，D为第五分部的厚度。
可选地，所述电池还包括第三填充件，所述第三填充件包括与所述第一弯折区相对的第一空白集流体及与所述第一弯折区相对的第二空白集流体，所述第一空白集流体设置于所述第一平面区远离所述第一弯折区的一端，并相对所述第一平面区弯折；所述第二空白集流体设置于所述第一双面区远离所述第一空白区的一端，并相对所述第一双面区弯折；所述第一空白集流体、所述第二空白集流体、所述第一极耳和所述第二极耳在所述电极组件的厚度方向上的投影不重叠。
可选地，所述第一极耳包括靠近所述第一弯折区的第一端及背对所述第一端的第二端，所述第二极耳包括靠近所述第一弯折区的第三端及背对所述第三端的第四端；在所述电极组件的宽度方向上，所述第一空白集流体靠近所述第一弯折区的一端至所述第二端的垂直距离为0mm-4mm，所述第二空白集流体靠近所述第一弯折区的一端至所述第二端的垂直距离为0mm-4mm。
可选地，所述第一填充件包括第一涂层、第二涂层、第三涂层及第四涂层，所述第一涂层设置于所述第一平面区，所述第二涂层设置于所述第一弯折区，所述第三涂层设置于所述第二平面区，所述第四涂层设置于所述第二弯折区。
可选地，所述第一极耳包括靠近所述第一弯折区的第一端及背对所述第一端的第二端，所述第二极耳包括靠近所述第一弯折区的第三端及背对所述第三端的第四端；在所述电极组件的宽度方向上，所述第一涂层靠近所述第一弯折区的一端至所述第四端的垂直距离为0mm-4mm，所述第一涂层远离所述第一弯折区的一端至所述第一端的垂直距离为0mm-4mm，所述第二涂层靠近所述第二弯折区的一端至所述第三端的垂直距离为0mm-4mm，所述第三涂层靠近所述第一弯折区的一端至所述第四端的垂直距离为0mm-4mm，所述第三涂层远离所述第一弯折区的一端至所述第一端的垂直距离为0mm-4mm，所述第四涂层靠近所述第一弯折区的一端至所述第二端的垂直距离为0mm-4mm。
可选地，所述有机酯类溶剂包括碳酸亚乙酯、碳酸丙烯酯、碳酸甲乙酯和碳酸二乙酯，所述电解液中所述碳酸亚乙酯的质量分数为5％-23％，所述电解液中所述碳酸丙烯酯的质量分数为0％-30％，所述电解液中所述碳酸甲乙酯的质量分数为0％-60％，所述电解液中所述碳酸二乙酯的质量分数为0％-60％。
可选地，所述成膜添加剂还包括碳酸亚乙烯酯、卤代碳酸酯和二氟磷酸锂，所述电解液中所述碳酸亚乙烯酯的质量分数为0％-2％，所述电解液中所述卤代碳酸酯的质量分数为0％-4％，所述电解液中所述二氟磷酸锂的质量分数为0％-2％。
综上所述，PS是一种致癌物质,被欧盟Reach法规列入SVHC高度关注物质清单中,玩具类等与儿童直接接触的产品尤其特别关注PS的含量,对低PS含量的环保锂离子电池需求迫切，但PS是一种优良的成膜添加剂，PS不足会影响固体电解质界面膜(Solid electrolyte interface,SEI)成膜,影响电池的循环和高温存储等性能，通过所述碳酸亚乙烯酯、卤代碳酸酯和二氟磷酸锂等成膜添加剂,强化阴阳极成膜,弥补因PS含量降低导致的SEI膜成膜不足,同时电流密度的大小对SEI膜的形成有重要的影响，SEI膜的形成包括晶核形成和生长两个过程，电流密度较大时，晶核形成速率快，导致SEI膜结构疏松，且在负极表面附着不牢。当电极组件内部结构分布不平整时，化成时内部不同位置受力不同，电流密度分布不均匀，局部电流密度过大，使得形成的SEI膜疏松、不稳定且一致性差。本申请通过所述第一填充件的设置，补偿了因第一极耳和第二极耳的设置所形成的极耳部分与非极耳部分之间的厚度差，从而提高了电极组件内部的结构平整度，进而促进电极组件内部电流密度的均匀分布，有利于形成一致性好，且稳定的SEI膜。
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为图1所示电极组件的结构示意图。
图3为图2所示第一极片的结构示意图。
图4为图2所示第二极片的结构示意图。
图5为本申请一实施方式的电极组件的结构示意图。
图6为图5所示第一极片的结构示意图。
图7为本申请另一实施方式的电极组件的结构示意图。
图8为本申请又一实施方式的电极组件的结构示意图。
图9为图8所示第一极片的结构示意图。
图10为本申请另一实施方式的电池的结构示意图。
主要元件符号说明
电池                           100
电极组件                     10
第一极片                     11
第一集流体                   111
第一活性物质层               112
第一空白区                   113
第一平面区                   1131
第一弯折区                   1132
第一单面区                   114
第二弯折区                   1141
第二平面区                   1142
第一双面区                   115
第二极片                     12
第二集流体                   121
第二活性物质层               122
第二空白区                   123
第三平面区                   1231
第三弯折区                   1232
第二双面区                   124
第二单面区                   125
第四弯折区                   1251
第三空白区                   126
第五弯折区                   1261
隔离膜                       13
包装袋                       20
电解液                       30
第一极耳                     40
第一端                       401
第二端                       402
第二极耳                     50
第三端                       501
第四端                       502
第一填充件                   60
第一填充部                   601a
第二填充部                   602a
第三填充部                   603a
第一分部                     601b
第二分部                     602b
第三分部                     603b
第一涂层                     601c
第二涂层                     602c
第三涂层                     603c
第四涂层                     604c
第二填充件                   70
第四填充部                   701a
第五填充部                   702a
第四分部                     701b
第五分部                     702b
第三填充件                   80
第一空白集流体               801
第二空白集流体               802
第一粘接部                   901
第二粘接部                   902
第三粘接部                   903
第四粘接部                   904
第五粘接部                   905
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
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本申请一 部分实施例，而不是全部的实施例。基于本申请中的实施例，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例，都属于本申请保护的范围。
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。本文中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。
下面结合附图，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。
参阅图1和图10，本申请实施方式提供了一种电池100。所述电池100包括电极组件10、收容所述电极组件10的包装袋20、容纳于所述包装袋20内的电解液30、第一极耳40、第二极耳50及第一填充件60。
所述电解液30包括锂盐、有机酯类溶剂及成膜添加剂。所述成膜添加剂包括1,3-丙烷磺酸内酯(PS)。在所述电解液30中，所述1,3-丙烷磺酸内酯的质量分数为0％-1％。
一实施方式中，所述有机酯类溶剂包括碳酸亚乙酯(EC)、碳酸丙烯酯(PC)、碳酸甲乙酯(EMC)和碳酸二乙酯(DEC)。其中，在所述电解液30中，所述碳酸亚乙酯的质量分数为5％-23％，所述碳酸丙烯酯的质量分数为0％-30％，所述碳酸甲乙酯的质量分数为0％-60％，所述碳酸二乙酯的质量分数为0％-60％。
进一步地，所述成膜添加剂还包括碳酸亚乙烯酯(VC)、卤代碳酸酯(FEC)和二氟磷酸锂(LiPO 2F 2)。其中，在所述电解液30中，所述碳酸亚乙烯酯的质量分数为0％-2％，所述卤代碳酸酯的质量分数为0％-4％，所述二氟磷酸锂的质量分数为0％-2％。
参图1和图2，所述电极组件10由叠置的第一极片11和第二极片12卷绕形成。其中，所述第一极耳40设置于所述第一极片11，所述第二极耳50设置于所述第二极片12。
参图3，所述第一极片11包括第一集流体111及分别设置于所述第一集流体111两侧的第一活性物质层112。
参图3，所述第一集流体111包括依次设置的第一空白区113、第一单面区114和第一双面区115。其中，所述第一空白区113的两侧均未设置第一活性物质层112，所述第一单面区114朝向所述电极组件10中心的表面未设置第一活性物质层112(参图3)，所述第一双面区115的两侧均设置有第一活性物质层112。
参图2，所述第一空白区113包括由所述第一极片11的卷绕起始端到所述第一极片11第一次弯折处的第一平面区1131及连接所述第一平面区1131的第一弯折区1132。所述第一单面区114包括第二弯折区1141及连接于所述第一弯折区1132和所述第二弯折区1141之间的第二平面区1142。所述第二平面区1142和所述第一平面区1131相对，所述第二弯折区1141与所述第一弯折区1132相对。其中，所述第一极耳40设置于所述第一平面区1131。
一实施方式中，所述第一极耳40设置于所述第一平面区1131背对所述电极组件10中心的表面；
或者所述第一极耳40设置于所述第一平面区1131朝向所述电极组件10中心的表面。
参图4，所述第二极片12包括第二集流体121及分别设置于所述第二集流体121两侧的第二活性物质层122。
所述第二集流体121包括依次设置的第二空白区123和第二双面区124。其中，所述第二空白区123的两侧均未设置第二活性物质层122，所述第二双面区124的两侧均设置有第二活性物质层122。
参图2，所述第二空白区123包括由所述第二极片12的卷绕起始端到所述第二极片12第一次弯折处的第三平面区1231及连接所述第三平面区1231的第三弯折区1232。所述第三平面区1231与所述第一平面区1131相对，所述第三弯折区1232与所述第二弯折区1141相对。其中，所述第二极耳50设置于所述第三平面区1231。
一实施方式中，所述第二极耳50设置于所述第三平面区1231背对所述电极组件10中心的表面；
或者所述第二极耳50设置于所述第三平面区1231朝向所述电极组件10中心的表面。
进一步地，参图4，所述第二集流体121还包括连接于所述第二双面区124的第二单面区125及连接于所述第二单面区125的第三空白区126。所述第二单面区125和所述第三空白区126位于所述电极组件10的最外圈。其中，所述第二单面区125背对所述电极组件10中心的表面未设置第二活性物质层122，所述第三空白区126的两侧均未设置第二活性物质层122。
参图2和图4，所述第二单面区125包括与所述第二弯折区1141相对的第四弯折区1251。所述第三空白区126包括与所述第一弯折区1132相对的第五弯折区1261。
参图2，所述第一极耳40包括靠近所述第一弯折区1132的第一端401及背对所述第一端401的第二端402。所述第二极耳50包括靠近所述第一弯折区1132的第三端501及背对所述第三端501的第四端502。
参图2、图5、图7和图8，所述第一填充件60设置于所述第一平面区1131或所述第二平面区1142。所述第一填充件60、所述第一极耳40和所述第二极耳50在所述电极组件10的厚度方向(即X轴方向)上的投影不重叠。如此，通过所述第一填充件60的设置，补偿了因第一极耳40和第二极耳50的设置所形成的极耳部分与非极耳部分之间的厚度差，从而提高了电极组件10内部的结构平整度，进而促进电极组件10内部电流密度的均匀分布。其中，所述第一填充件60可以是绿胶或热熔胶。
在本实施方式中，参图1和图2，所述第一填充件60包括第一填充部601a、第二填充部602a和第三填充部603a。所述第一填充部601a设置于所述第一弯折区1132，所述第二填充部602a设置于所述第二平面区1142，所述第三填充部603a设置于所述第二弯折区1141。如此，通过所述第二填充部602a的设置，补偿了因第一极耳40和第二极耳50的设置所形成的极耳部分与非极耳部分之间的厚度差，从而提高了电极组件10内部的结构平整度，进而促进电极组件10内部电流密度的均匀分布。同时，通过所述第一填充部601a及所述第三填充部603a的设置，补偿了因卷绕极片导致的弯 折区部分出现的厚度差，从而有效提高电极组件10内部的结构平整度，进而进一步促进电极组件10内部电流密度的均匀分布。
其中，参图2，在所述电极组件10的宽度方向(即Y轴方向)上，所述第一填充部601a靠近所述第二弯折区1141的一端至所述第三端501的垂直距离d1为0mm-4mm，所述第二填充部602a靠近所述第一弯折区1132的一端至所述第四端502的垂直距离d2为0mm-4mm，所述第二填充部602a靠近所述第二弯折区1141的一端至所述第一端401的垂直距离d3为0mm-4mm，所述第三填充部603a靠近所述第一弯折区1132的一端至所述第二端402的垂直距离d4为0mm-4mm。
进一步地，参图2，所述第一极片11和所述第二极片12之间还设置有隔离膜13。请一并参图3，所述电池100还包括第一粘接部901及第二粘接部902。所述第一粘接部901包覆所述第一极耳40。所述第二粘接部902设置于所述第一单面区114，并位于所述第三填充部603a远离所述第二填充部602a的一侧。其中，所述第一粘接部901和所述第二粘接部902的设置用于保护隔离膜13，以避免出现因第一极耳40及第一集流体111上的毛刺而导致隔离膜13被刺破的问题。
一实施方式中，参图1，所述电池100还包括第二填充件70。所述第二填充件70包括第四填充部701a和第五填充部702a。所述第四填充部701a设置于所述第四弯折区1251，所述第五填充部702a设置于所述第五弯折区1261。所述第四填充部701a、所述第五填充部702a、所述第一极耳40及所述第二极耳50在所述电极组件10的上的投影不重叠。如此，通过所述第二填充件70的设置，补偿了因卷绕极片导致的弯折区部分出现的厚度差，从而有效提高电极组件10内部的结构平整度，进而进一步促进电极组件10内部电流密度的均匀分布。其中，所述第二填充件70可以是绿胶或热熔胶。
其中，参图2，在所述电极组件10的宽度方向上，所述第四填充部701a靠近所述第二弯折区1141的一端至所述第三端501的垂直距离d1为0mm-4mm，所述第五填充部702a靠近所述第一弯折区1132的一端至所述第二端402的垂直距离d4为0mm-4mm。
进一步地，参图4，所述电池100还包括第三粘接部903、第四粘接部904及第五粘接部905。所述第三粘接部903包覆所述第二极耳50。所述第四粘接部904设置于所述第二单面区125，并位于所述第四填充部701a远离所述第五填充部702a的一侧。所述第五粘接部905设置于所述第三空白区126背对所述第五填充部702a的表面。其中，所述第三粘接部903、所述第四粘接部904及所述第五粘接部905的设置用于保护隔离膜13，以避免出现因第二极耳50及第二集流体121上的毛刺而导致隔离膜13被刺破的问题。
在另一实施方式中，参图5和图6，所述第一填充件60包括第一分部601b、第二分部602b及第三分部603b。其中，所述电池100还包括第二填充件70。所述第二填充件70包括连接于所述第一分部601b和所述第二分部602b之间的第四分部701b及连接于所述第二分部602b和所述第三分部603b之间的第五分部702b。所述第四分部701b设置于所述第一平面区1131背对所述第一极耳40的表面，所述第五分部702b设置于所述第一平面区1131背对所述第二极耳50的表面。所述第一分部601b和所述第二分部602b设置于所述第一平面区1131，所述第三分部603b设置于所述第一弯折区1132。如此，通过所述第一分部601b、所述第二分部602b、所述第四分部701b及所述第五分部702b的设置，补偿了因第一极耳40和第二极耳50的设置所形成的极耳部分与非极耳部分之间的厚度差，从而提高了电极组件10内部的结构平整度，进而促进电极组件10内部电流密度的均匀分布。同时，通过所述第三分部603b的设置，补偿了因卷绕极片导致的弯折区部分出现的厚度差，从而有效提高电极组件10内部的结构平整度，进而进一步促进电极组件10内部电流密度的均匀分布。
在所述电极组件10的厚度方向上，
所述第一分部601b的厚度A1满足公式：A1-B-C≤20μm；
所述第二分部602b的厚度A2满足公式：A2-B-C≤20μm；
所述第三分部603b的厚度A3满足公式：A3-B-D≤20μm；
其中，B为所述第一极耳40的厚度，C为第四分部701b的厚度，D为第五分部702b的厚度。
在其他实施方式中，参图7，所述电池100还包括第三填充件80。 所述第三填充件80包括与所述第一弯折区1132相对的第一空白集流体801及与所述第一弯折区1132相对的第二空白集流体802。所述第一空白集流体801设置于所述第一平面区1131远离所述第一弯折区1132的一端，并相对所述第一平面区1131弯折。所述第二空白集流体802设置于所述第一双面区115远离所述第一空白区113的一端，并相对所述第一双面区115弯折。所述第一空白集流体801、所述第二空白集流体802、所述第一极耳40和所述第二极耳50在所述电极组件10的厚度方向上的投影不重叠。如此，所述第三填充件80的设置，补偿了因卷绕极片导致的弯折区部分出现的厚度差，从而有效提高电极组件10内部的结构平整度，进而进一步促进电极组件10内部电流密度的均匀分布。
其中，在所述电极组件10的宽度方向上，所述第一空白集流体801靠近所述第一弯折区1132的一端至所述第二端402的垂直距离e1为0mm-4mm，所述第二空白集流体802靠近所述第一弯折区1132的一端至所述第二端402的垂直距离e1为0mm-4mm。
在另一其他实施方式中，参图8和图9，所述第一填充件60包括第一涂层601c、第二涂层602c、第三涂层603c及第四涂层604c。所述第一涂层601c设置于所述第一平面区1131，所述第二涂层602c设置于所述第一弯折区1132，所述第三涂层603c设置于所述第二平面区1142，所述第四涂层604c设置于所述第二弯折区1141。如此，通过所述第一涂层601c及所述第三涂层603c的设置，补偿了因第一极耳40和第二极耳50的设置所形成的极耳部分与非极耳部分之间的厚度差，从而提高了电极组件10内部的结构平整度，进而促进电极组件10内部电流密度的均匀分布。同时，通过所述第二涂层602c及所述第三涂层603c的设置，补偿了因卷绕极片导致的弯折区部分出现的厚度差，从而有效提高电极组件10内部的结构平整度，进而进一步促进电极组件10内部电流密度的均匀分布。
其中，在所述电极组件10的宽度方向上，所述第一涂层601c靠近所述第一弯折区1132的一端至所述第四端502的垂直距离f1为0mm-4mm，所述第一涂层601c远离所述第一弯折区1132的一端至所述第一端401的垂直距离f2为0mm-4mm，所述第二涂层602c靠近所 述第二弯折区1141的一端至所述第三端501的垂直距离f3为0mm-4mm，所述第三涂层603c靠近所述第一弯折区1132的一端至所述第四端502的垂直距离f1为0mm-4mm，所述第三涂层603c远离所述第一弯折区1132的一端至所述第一端401的垂直距离f2为0mm-4mm，所述第四涂层604c靠近所述第一弯折区1132的一端至所述第二端402的垂直距离f4为0mm-4mm。
下面通过实施例对本申请的电池100进行具体说明。
实施例1
参图9和图10，所述电池100包括电极组件10、收容所述电极组件10的包装袋20、容纳于所述包装袋20内的电解液30、第一极耳40、第二极耳50及第一填充件60。
所述电解液30包括锂盐、有机酯类溶剂及成膜添加剂。其中，所述有机酯类溶剂包括碳酸亚乙酯(EC)、碳酸丙烯酯(PC)、碳酸甲乙酯(EMC)和碳酸二乙酯(DEC)。在所述电解液30中，所述碳酸亚乙酯的质量分数为5％-23％，所述碳酸丙烯酯的质量分数为0％-30％，所述碳酸甲乙酯的质量分数为0％-60％，所述碳酸二乙酯的质量分数为0％-60％。所述成膜添加剂包括1,3-丙烷磺酸内酯(PS)、碳酸亚乙烯酯(VC)、卤代碳酸酯(FEC)和二氟磷酸锂(LiPO 2F 2)。在所述电解液30中，所述1,3-丙烷磺酸内酯的质量分数为0％-1％，所述碳酸亚乙烯酯的质量分数为0％-2％，所述卤代碳酸酯的质量分数为0％-4％，所述二氟磷酸锂的质量分数为0％-2％。
请一并参图3和图4，所述电极组件10由叠置的第一极片11和第二极片12卷绕形成。
所述第一极片11包括第一集流体111及分别设置于所述第一集流体111两侧的第一活性物质层112。
所述第一集流体111包括依次设置的第一空白区113、第一单面区114和第一双面区115。
参图10，所述第一空白区113包括由所述第一极片11的卷绕起始端到所述第一极片11第一次弯折处的第一平面区1131及连接所述第一平面区1131的第一弯折区1132。所述第一单面区114包括第二弯折区1141及连接于所述第一弯折区1132和所述第二弯折 区1141之间的第二平面区1142。所述第二平面区1142和所述第一平面区1131相对，所述第二弯折区1141与所述第一弯折区1132相对。
所述第一极耳40设置于所述第一平面区1131背对所述电极组件10中心的表面，所述第二极耳50设置于所述第二极片12。
参图9和图10，所述第一填充件60包括第一涂层601c、第二涂层602c、第三涂层603c及第四涂层604c。所述第一涂层601c设置于所述第一平面区1131，所述第二涂层602c设置于所述第一弯折区1132，所述第三涂层603c设置于所述第二平面区1142，所述第四涂层604c设置于所述第二弯折区1141。其中，所述第一填充件60、所述第一极耳40和所述第二极耳50在所述电极组件10的厚度方向上的投影不重叠。
在实施例1中，所述第一极耳40包括靠近所述第一弯折区1132的第一端401及背对所述第一端401的第二端402。所述第二极耳50包括靠近所述第一弯折区1132的第三端501及背对所述第三端501的第四端502。
其中，参图8，在所述电极组件的宽度方向上，所述第一涂层601c靠近所述第一弯折区1132的一端至所述第四端502的垂直距离为0mm-4mm，所述第一涂层601c远离所述第一弯折区1132的一端至所述第一端401的垂直距离为0mm-4mm，所述第二涂层602c靠近所述第二弯折区1141的一端至所述第三端501的垂直距离为0mm-4mm，所述第三涂层603c靠近所述第一弯折区1132的一端至所述第四端502的垂直距离为0mm-4mm，所述第三涂层603c远离所述第一弯折区1132的一端至所述第一端401的垂直距离为0mm-4mm，所述第四涂层604c靠近所述第一弯折区1132的一端至所述第二端402的垂直距离为0mm-4mm。
实施例2
实施例2与实施例1的区别在于，实施例2中的第一填充件60及实施例2中的电池100还包括第二填充件70。
在实施例2中，参图5和图6，所述第一填充件60包括第一分部601b、第二分部602b及第三分部603b，所述第二填充件70包括连接 于所述第一分部601b和所述第二分部602b之间的第四分部701b及连接于所述第二分部602b和所述第三分部603b之间的第五分部。所述第四分部701b设置于所述第一平面区1131背对所述第一极耳40的表面，所述第五分部702b设置于所述第一平面区1131背对所述第二极耳50的表面。所述第一分部601b和所述第二分部602b设置于所述第一平面区1131，所述第三分部603b设置于所述第一弯折区1132。
在实施例2中，在所述电极组件10的厚度方向上，
所述第一分部601b的厚度A1满足公式：A1-B-C≤20μm；
所述第二分部602b的厚度A2满足公式：A2-B-C≤20μm；
所述第三分部603b的厚度A3满足公式：A3-B-D≤20μm；
其中，B为所述第一极耳40的厚度，C为第四分部701b的厚度，D为第五分部702b的厚度。
实施例3
实施例3与实施例1的区别在于，实施例3中的第一填充件60及实施例3中的电池100还包括第二填充件70。
在实施例3中，参图4，所述第二极片12包括第二集流体121及分别设置于所述第二集流体121两侧的第二活性物质层122。
所述第二集流体121包括依次设置的第二空白区123、第二双面区124、第二单面区125及第三空白区126。其中，所述第二单面区125和所述第三空白区126位于所述电极组件的最外圈。
参图1和图2，所述第二空白区123包括由所述第二极片12的卷绕起始端到所述第二极片12第一次弯折处的第三平面区1231及连接所述第三平面区1231的第三弯折区1232。所述第三平面区1231与所述第一平面区1131相对，所述第三弯折区1232与所述第一弯折区1132相对。其中，所述第二极耳50设置于所述第三平面区1231背对所述电极组件10中心的表面。
所述第二单面区125包括与所述第二弯折区1141相对的第四弯折区1251。
所述第三空白区126包括与所述第一弯折区1132相对的第五弯折区1261。
参图1和图2，所述第一填充件60包括第一填充部601a、第二填 充部602a和第三填充部603a。所述第一填充部601a设置于所述第一弯折区1132，所述第二填充部602a设置于所述第二平面区1142，所述第三填充部603a设置于所述第二弯折区1141。
其中，在所述电极组件的宽度方向上，所述第一填充部601a靠近所述第二弯折区1141的一端至所述第三端501的垂直距离为0mm-4mm，所述第二填充部602a靠近所述第一弯折区1132的一端至所述第四端502的垂直距离为0mm-4mm，所述第二填充部602a靠近所述第二弯折区1141的一端至所述第一端401的垂直距离为0mm-4mm，所述第三填充部603a靠近所述第一弯折区1132的一端至所述第二端402的垂直距离为0mm-4mm。
参图1和图2，所述第二填充件70包括第四填充部701a和第五填充部702a。所述第四填充部701a设置于所述第四弯折区1251，所述第五填充部702a设置于所述第五弯折区1261。所述第四填充部701a、所述第五填充部702a、所述第一极耳40及所述第二极耳50在所述电极组件10的上的投影不重叠。
其中，在所述电极组件10的宽度方向上，所述第四填充部701a靠近所述第二弯折区1141的一端至所述第三端501的垂直距离为0mm-4mm，所述第五填充部702a靠近所述第一弯折区1132的一端至所述第二端402的垂直距离为0mm-4mm。
实施例4
实施例4与实施例1的区别在于，实施例4中的第一填充件60及实施例4中的电池100还包括第三填充件80。
参图7，所述第一填充件60设置于所述第一平面区1131或所述第二平面区1142。
所述第三填充件80包括与所述第一弯折区1132相对的第一空白集流体801及与所述第一弯折区1132相对的第二空白集流体802。所述第一空白集流体801设置于所述第一平面区1131远离所述第一弯折区1132的一端，并相对所述第一平面区1131弯折。所述第二空白集流体802设置于所述第一双面区115远离所述第一空白区113的一端，并相对所述第一双面区115弯折。所述第一空白集流体801、所述第二空白集流体802、所述第一极耳40和所述第二极耳50在所述电 极组件10的厚度方向上的投影不重叠。
其中，在所述电极组件10的宽度方向上，所述第一空白集流体801靠近所述第一弯折区1132的一端至所述第二端402的垂直距离为0mm-4mm，所述第二空白集流体802靠近所述第一弯折区1132的一端至所述第二端402的垂直距离为0mm-4mm。
下面通过实施例对本申请的电解液30进行具体说明。
所述电解液30包括锂盐、有机酯类溶剂及成膜添加剂。其中，所述有机酯类溶剂包括碳酸亚乙酯(EC)、碳酸丙烯酯(PC)、碳酸甲乙酯(EMC)和碳酸二乙酯(DEC)。所述成膜添加剂包括1,3-丙烷磺酸内酯(PS)、碳酸亚乙烯酯(VC)、卤代碳酸酯(FEC)和二氟磷酸锂(LiPO 2F 2)。
其中，将对比例1及实施例1-17中各组分及含量列于表1，以及将应用对比例1及实施例1-17中电解液30的电池100的测试条件及测试结果列于表2。
表1
Figure PCTCN2020077640-appb-000001
Figure PCTCN2020077640-appb-000002
其中，表1中所示百分数，均为在电解液30中，PS、VC、FEC及LiPO 2F 2的质量分数。在所述电解液30中，所述碳酸亚乙酯的质量分数为5％-23％，所述碳酸丙烯酯的质量分数为0％-30％，所述碳酸甲乙酯的质量分数为0％-60％，所述碳酸二乙酯的质量分数为0％-60％。
表2
Figure PCTCN2020077640-appb-000003
Figure PCTCN2020077640-appb-000004
其中，表2中将电池100的容量降至80％后，再于不同测试条件下测试电池100的循环测试及膨胀率。
结合表1和表2可知，本申请中通过调整PS、VC、FEC及LiPO 2F 2的含量，在保证电池100有良好循环性能及高温存储性能的前提下，有效控制PS在电解液30中的质量分数在0％-1％之间，从而降低PS对人体的危害。
以上实施例仅用以说明本申请的技术方案而非限制，尽管参照较佳实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解，可以对本申请的技术方案进行修改或等同替换，而不脱离本申请技术方案的精神和实质。

Claims (15)

  1. 一种电池，包括电极组件、收容所述电极组件的包装袋、容纳于所述包装袋内的电解液、第一极耳及第二极耳，所述电极组件由叠置的第一极片和第二极片卷绕形成，所述第一极片包括第一集流体及分别设置于所述第一集流体两侧的第一活性物质层，其特征在于，
    所述电解液包括锂盐、有机酯类溶剂及成膜添加剂，所述成膜添加剂包括1,3-丙烷磺酸内酯，所述电解液中所述1,3-丙烷磺酸内酯的质量分数为0％-1％；
    所述第一集流体包括依次设置的第一空白区、第一单面区和第一双面区，所述第一空白区包括由所述第一极片的卷绕起始端到所述第一极片第一次弯折处的第一平面区及连接所述第一平面区的第一弯折区，所述第一单面区包括第二弯折区及连接于所述第一弯折区和所述第二弯折区之间的第二平面区，所述第二平面区和所述第一平面区相对，所述第二弯折区与所述第一弯折区相对；
    所述第一极耳设置于所述第一平面区，所述第二极耳设置于所述第二极片；
    所述电池还包括第一填充件，所述第一填充件设置于所述第一平面区或所述第二平面区，所述第一填充件、所述第一极耳和所述第二极耳在所述电极组件的厚度方向上的投影不重叠。
  2. 如权利要求1所述的电池，其特征在于，所述第二极片包括第二集流体及分别设置于所述第二集流体两侧的第二活性物质层，所述第二集流体包括依次设置的第二空白区和第二双面区，所述第二空白区包括由所述第二极片的卷绕起始端到所述第二极片第一次弯折处的第三平面区及连接所述第三平面区的第三弯折区，所述第三平面区与所述第一平面区相对，所述第三弯折区与所述第二弯折区相对，所述第二极耳设置于所述第三平面区。
  3. 如权利要求2所述的电池，其特征在于，所述第一填充件包括第一填充部、第二填充部和第三填充部，所述第一填充部设置于所述第一弯折区，所述第二填充部设置于所述第二平面区，所述第三填充部设置于所述第二弯折区。
  4. 如权利要求3所述的电池，其特征在于，所述第一极耳包括靠近所述第一弯折区的第一端及背对所述第一端的第二端，所述第二极耳包括靠近所述第一弯折区的第三端及背对所述第三端的第四端；在所述电极组件的宽度方向上，所述第一填充部靠近所述第二弯折区的一端至所述第三端的垂直距离为0mm-4mm，所述第二填充部靠近所述第一弯折区的一端至所述第四端的垂直距离为0mm-4mm，所述第二填充部靠近所述第二弯折区的一端至所述第一端的垂直距离为0mm-4mm，所述第三填充部靠近所述第一弯折区的一端至所述第二端的垂直距离为0mm-4mm。
  5. 如权利要求2或3所述的电池，其特征在于，所述第二集流体还包括连接于所述第二双面区的第二单面区及连接于所述第二单面区的第三空白区，所述第二单面区和所述第三空白区位于所述电极组件的最外圈，所述第二单面区包括与所述第二弯折区相对的第四弯折区，所述第三空白区包括与所述第一弯折区相对的第五弯折区。
  6. 如权利要求5所述的电池，其特征在于，所述电池还包括第二填充件，所述第二填充件包括第四填充部和第五填充部，所述第四填充部设置于所述第四弯折区，所述第五填充部设置于所述第五弯折区，所述第四填充部、所述第五填充部、所述第一极耳及所述第二极耳在所述电极组件的厚度方向上的投影不重叠。
  7. 如权利要求6所述的电池，其特征在于，所述第一极耳包括靠近所述第一弯折区的第一端及背对所述第一端的第二端，所述第二极耳包括靠近所述第一弯折区的第三端及背对所述第三端的第四端；在所述电极组件的宽度方向上，所述第四填充部靠近所述第二弯折区的一端至所述第三端的垂直距离为0mm-4mm，所述第五填充部靠近所述第一弯折区的一端至所述第二端的垂直距离为0mm-4mm。
  8. 如权利要求1或2所述的电池，其特征在于，所述电池还包括第二填充件，所述第一填充件包括第一分部、第二分部及第三分部，所述第二填充件包括连接于所述第一分部和所述第二分部之间的第四分部和连接于所述第二分部和所述第三分部的第五分部，所述第四分部设置于所述第一平面区背对所述第一极耳的表面，所述第五 分部设置于所述第一平面区背对所述第二极耳的表面，所述第一分部和所述第二分部设置于所述第一平面区，所述第三分部设置于所述第一弯折区。
  9. 如权利要求8所述的电池，其特征在于，在所述电极组件的厚度方向上，
    所述第一分部的厚度A1满足公式：A1-B-C≤20μm；
    所述第二分部的厚度A2满足公式：A2-B-C≤20μm；
    所述第三分部的厚度A3满足公式：A3-B-D≤20μm；
    其中，B为所述第一极耳的厚度，C为第四分部的厚度，D为第五分部的厚度。
  10. 如权利要求1或2所述的电池，其特征在于，所述电池还包括第三填充件，所述第三填充件包括与所述第一弯折区相对的第一空白集流体及与所述第一弯折区相对的第二空白集流体，所述第一空白集流体设置于所述第一平面区远离所述第一弯折区的一端，并相对所述第一平面区弯折；所述第二空白集流体设置于所述第一双面区远离所述第一空白区的一端，并相对所述第一双面区弯折；所述第一空白集流体、所述第二空白集流体、所述第一极耳和所述第二极耳在所述电极组件的厚度方向上的投影不重叠。
  11. 如权利要求10所述的电池，其特征在于，所述第一极耳包括靠近所述第一弯折区的第一端及背对所述第一端的第二端，所述第二极耳包括靠近所述第一弯折区的第三端及背对所述第三端的第四端；在所述电极组件的宽度方向上，所述第一空白集流体靠近所述第一弯折区的一端至所述第二端的垂直距离为0mm-4mm，所述第二空白集流体靠近所述第一弯折区的一端至所述第二端的垂直距离为0mm-4mm。
  12. 如权利要求1或2所述的电池，其特征在于，所述第一填充件包括第一涂层、第二涂层、第三涂层及第四涂层，所述第一涂层设置于所述第一平面区，所述第二涂层设置于所述第一弯折区，所述第三涂层设置于所述第二平面区，所述第四涂层设置于所述第二弯折区。
  13. 如权利要求12所述的电池，其特征在于，所述第一极耳包括 靠近所述第一弯折区的第一端及背对所述第一端的第二端，所述第二极耳包括靠近所述第一弯折区的第三端及背对所述第三端的第四端；在所述电极组件的宽度方向上，所述第一涂层靠近所述第一弯折区的一端至所述第四端的垂直距离为0mm-4mm，所述第一涂层远离所述第一弯折区的一端至所述第一端的垂直距离为0mm-4mm，所述第二涂层靠近所述第二弯折区的一端至所述第三端的垂直距离为0mm-4mm，所述第三涂层靠近所述第一弯折区的一端至所述第四端的垂直距离为0mm-4mm，所述第三涂层远离所述第一弯折区的一端至所述第一端的垂直距离为0mm-4mm，所述第四涂层靠近所述第一弯折区的一端至所述第二端的垂直距离为0mm-4mm。
  14. 如权利要求1所述的电池，其特征在于，所述有机酯类溶剂包括碳酸亚乙酯、碳酸丙烯酯、碳酸甲乙酯和碳酸二乙酯，所述电解液中所述碳酸亚乙酯的质量分数为5％-23％，所述电解液中所述碳酸丙烯酯的质量分数为0％-30％，所述电解液中所述碳酸甲乙酯的质量分数为0％-60％，所述电解液中所述碳酸二乙酯的质量分数为0％-60％。
  15. 如权利要求14所述的电池，其特征在于，所述成膜添加剂还包括碳酸亚乙烯酯、卤代碳酸酯和二氟磷酸锂，所述电解液中所述碳酸亚乙烯酯的质量分数为0％-2％，所述电解液中所述卤代碳酸酯的质量分数为0％-4％，所述电解液中所述二氟磷酸锂的质量分数为0％-2％。
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