WO2025138403A1 - 一种绝缘胶和电池 - Google Patents

一种绝缘胶和电池 Download PDF

Info

Publication number
WO2025138403A1
WO2025138403A1 PCT/CN2024/076294 CN2024076294W WO2025138403A1 WO 2025138403 A1 WO2025138403 A1 WO 2025138403A1 CN 2024076294 W CN2024076294 W CN 2024076294W WO 2025138403 A1 WO2025138403 A1 WO 2025138403A1
Authority
WO
WIPO (PCT)
Prior art keywords
adhesive layer
melting
layer
melting point
adhesive
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
PCT/CN2024/076294
Other languages
English (en)
French (fr)
Inventor
裴佳佳
张柳浩
陈敏康
林文荣
贺飞
李素丽
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhuhai Cosmx Battery Co Ltd
Original Assignee
Zhuhai Cosmx Battery Co Ltd
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 Zhuhai Cosmx Battery Co Ltd filed Critical Zhuhai Cosmx Battery Co Ltd
Publication of WO2025138403A1 publication Critical patent/WO2025138403A1/zh
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00Electrodes
    • H01M4/02Electrodes composed of, or comprising, active material
    • H01M4/62Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/621Binders
    • H01M4/622Binders being polymers
    • H01M4/623Binders being polymers fluorinated polymers
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J123/00Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
    • C09J123/02Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
    • C09J123/10Homopolymers or copolymers of propene
    • C09J123/12Polypropene
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J123/00Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
    • C09J123/02Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
    • C09J123/10Homopolymers or copolymers of propene
    • C09J123/14Copolymers of propene
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J123/00Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
    • C09J123/02Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
    • C09J123/16Elastomeric ethylene-propylene or ethylene-propylene-diene copolymers, e.g. EPR and EPDM rubbers
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J151/00Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
    • C09J151/06Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00Adhesives in the form of films or foils
    • C09J7/10Adhesives in the form of films or foils without carriers
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00Adhesives in the form of films or foils
    • C09J7/30Adhesives in the form of films or foils characterised by the adhesive composition
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/05Accumulators with non-aqueous electrolyte
    • H01M10/052Li-accumulators
    • H01M10/0525Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00Electrodes
    • H01M4/02Electrodes composed of, or comprising, active material
    • H01M4/62Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00Electrodes
    • H01M4/02Electrodes composed of, or comprising, active material
    • H01M4/62Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/621Binders
    • H01M4/622Binders being polymers
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10Primary casings; Jackets or wrappings
    • H01M50/131Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10Primary casings; Jackets or wrappings
    • H01M50/183Sealing members
    • H01M50/184Sealing members characterised by their shape or structure
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/409Separators, membranes or diaphragms characterised by the material
    • H01M50/411Organic material
    • H01M50/414Synthetic resins, e.g. thermoplastics or thermosetting resins
    • H01M50/417Polyolefins
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/409Separators, membranes or diaphragms characterised by the material
    • H01M50/449Separators, membranes or diaphragms characterised by the material having a layered structure
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50Current conducting connections for cells or batteries
    • H01M50/531Electrode connections inside a battery casing
    • H01M50/534Electrode connections inside a battery casing characterised by the material of the leads or tabs
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50Current conducting connections for cells or batteries
    • H01M50/543Terminals
    • H01M50/552Terminals characterised by their shape
    • H01M50/553Terminals adapted for prismatic, pouch or rectangular cells
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2203/00Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/33Applications of adhesives in processes or use of adhesives in the form of films or foils for batteries or fuel cells

Definitions

  • the present disclosure relates to the technical field of batteries, and in particular to an insulating adhesive and a battery comprising the insulating adhesive.
  • Lithium-ion batteries have been widely used in consumer electronics, electric vehicles, power tools and other products due to their high energy density, high voltage and long cycle times.
  • the requirements for the electrical performance and safety of battery cells during use have also been further improved; when the battery cell is fast charged, the current density at the tab is the highest, and during excessive discharge, the temperature of the battery cell will rise sharply.
  • the battery is composed of a positive electrode assembly, a negative electrode assembly, a separator, a packaging film, and an electrolyte.
  • the battery cell shell needs to be connected to the outside world for conductivity, and the ear glue is heat-sealed with the aluminum-plastic film (packaging film) to form a sealed shell, thereby blocking moisture and air and ensuring the sealing performance of the battery cell.
  • the bonding force between the ear glue layers decreases, and stratification occurs, causing the sealed shell to have an opening and leakage at the edge, and water vapor enters the battery cell, thereby reducing the safety performance of the battery.
  • the present invention provides an insulating glue and a battery including the insulating glue.
  • the insulating glue disclosed in the present invention has good adhesion between the layers, and will not be stratified when immersed in the electrolyte. At the same time, it can have the performance of high-temperature opening when the battery cell has thermal runaway; the battery including the insulating glue has high safety performance and good sealing performance of the sealed shell, and there will be no stratification of the insulating glue to cause leakage of the sealed shell.
  • b is 40°C-60°C
  • the insulating adhesive comprises at least a first adhesive layer and a second adhesive layer, the second adhesive layer is located on a surface of one side of the first adhesive layer, the melting point of the first adhesive layer is 95°C-130°C, and the melting point of the second adhesive layer is 140°C-170°C.
  • the insulating adhesive includes a third adhesive layer, the third adhesive layer is located on a surface of the second adhesive layer away from the first adhesive layer, and the insulating adhesive satisfies: the melting point of the second adhesive layer is greater than the melting point of the third adhesive layer, and/or the melting point of the second adhesive layer is greater than the melting point of the first adhesive layer;
  • the melting point of the third adhesive layer is 95° C.-130° C.
  • the difference between the melting point of the third adhesive layer and the melting point of the first adhesive layer is -5°C to 25°C.
  • the melting point of the first adhesive layer includes a melting peak a1 of the first melting region and a melting peak a2 of the second melting region;
  • the melting point of the third adhesive layer includes the melting peak a1 of the first melting region and the melting peak a2 of the second melting region.
  • a second aspect of the present disclosure provides a battery, which includes the insulating glue described in the first aspect.
  • the battery comprises a pole piece assembly and a packaging film
  • the pole piece assembly comprises a pole piece and a pole piece conductive material
  • the pole piece comprises a current collector and an active material layer located on one side or both sides of the current collector
  • the pole piece conductive material is located at one end of the current collector
  • the first end of the conductive material is a welding end
  • the welding end is welded to the current collector
  • the second end opposite to the first end is a protruding end
  • a glue coating area is formed between the welding end and the protruding end
  • an insulating glue is arranged on the glue coating area
  • the insulating glue covers the surface of the conductive material
  • the first glue layer in the insulating glue The surface away from the second glue layer is adjacent to the conductive material
  • the packaging film is connected to the insulating glue to form a sealed shell
  • the pole piece assembly is located in the closed space formed by the sealed shell
  • the packaging film includes an inner film layer connected to the second glue layer or the third glue layer
  • the difference between the melting point of the first film layer and the melting point of the second adhesive layer or the third adhesive layer is -5°C to 40°C;
  • the first film layer comprises modified polypropylene and/or propylene ethylene copolymer
  • the insulating adhesive disclosed in the present invention includes at least three melting regions, and the melting peaks of the three melting regions are limited to a specific range, the melting peak a1 of the first melting region is 95°C-115°C (for example, 95°C, 100°C, 105°C, 110°C, 115°C), the melting peak a2 of the second melting region is 115°C-130°C (for example, 115°C, 118°C, 120°C, 122°C, 125°C, 128°C, 13 0°C), the melting peak a3 of the third melting region is 140°C-165°C (for example, 140°C, 145°C, 150°C, 155°C, 160°C, 165°C), the temperature T3 of the melting peak a3 of the third melting region and the temperature T1 of the melting peak a1 of the first melting
  • the insulating adhesive comprises at least a first adhesive layer and a second adhesive layer, the second adhesive layer is located on a surface of one side of the first adhesive layer, and the melting point of the first adhesive layer is 95°C-130°C (for example, 95°C, 100°C, 105°C, 110°C, 115°C, 120°C, 125°C, 130°C).
  • the melting point refers to the temperature corresponding to the peak value of the melting endothermic peak during the heating process.
  • the melting point of the first adhesive layer includes a melting peak a1 of the first melting region and a melting peak a2 of the second melting region.
  • the width of the first adhesive layer and the width of the second adhesive layer may be the same or different.
  • the direction a of the width of the adhesive layer is perpendicular to the direction in which the adhesive layer surrounds.
  • a width of the second adhesive layer is smaller than a width of the first adhesive layer.
  • the insulating adhesive includes a third adhesive layer, which is located on a surface of the second adhesive layer away from the first adhesive layer, and the insulating adhesive satisfies: the melting point of the second adhesive layer is greater than the melting point of the third adhesive layer, and/or the melting point of the second adhesive layer is greater than the melting point of the first adhesive layer.
  • the insulating adhesive satisfies: the melting point of the second adhesive layer is greater than the melting point of the third adhesive layer, and the melting point of the second adhesive layer is greater than the melting point of the first adhesive layer.
  • the melting points of the first adhesive layer, the second adhesive layer and the third adhesive layer in the insulating adhesive satisfy the above-mentioned specific relationship, compared with conventional ear glue, the first adhesive layer and the third adhesive layer have low thermal deformation temperatures (low melting points). At the same temperature, the first adhesive layer and the third adhesive layer are more susceptible to thermal deformation.
  • the first modified resin includes one or more of maleic anhydride modified polypropylene, acrylic acid modified polypropylene, metallocene modified polypropylene, propylene-ethylene copolymer and butene-propylene copolymer.
  • the second layer of adhesive includes one or more of polypropylene, block polypropylene and copolymer polypropylene; wherein the block polypropylene includes alternating propylene ethylene segments and/or alternating butene propylene segments, and the copolymer polypropylene includes ethylene propylene copolymer and/or butene propylene copolymer.
  • a second aspect of the present disclosure provides a battery, which includes the insulating glue described in the first aspect.
  • the battery includes a pole piece assembly and a packaging film
  • the pole piece assembly includes a pole piece and a pole piece conductive material
  • the pole piece includes a current collector and an active material layer located on one side or both sides of the current collector
  • the pole piece conductive material is located at one end of the current collector
  • the first end of the conductive material is a welding end
  • the welding end is welded to the current collector
  • the second end opposite to the first end is a protruding end
  • a glue coating area is formed between the welding end and the protruding end
  • an insulating glue is provided on the glue coating area
  • the insulating glue covers the surface of the conductive material
  • the insulating glue The surface of the first glue layer in the insulating glue away from the second glue layer is adjacent to the conductive material
  • the packaging film is connected to the insulating glue to form a sealed shell
  • the pole piece assembly is located in the closed space formed by the sealed shell
  • the packaging film includes an inner film layer connected to the second glue layer
  • the pole piece assembly includes a pole piece and a pole piece conductive material
  • the pole piece includes a current collector 1 and an active material layer 2 located on one side or both sides of the current collector 1
  • the pole piece conductive material 3 is located at one end of the current collector 1
  • the first end of the conductive material 3 is a welding end 311
  • the welding end 311 is welded to the current collector 1
  • the second end opposite to the first end is a protruding end 312
  • a glue coating area is formed between the welding end and the protruding end
  • an insulating glue 4 is provided on the glue coating area
  • the insulating glue 4 covers the surface of the conductive material 3
  • the surface of the first glue layer 41 in the insulating glue away from the second glue layer 42 is adjacent to the conductive material 3.
  • the electrode sheet includes a positive electrode sheet and/or a negative electrode sheet.
  • the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer located on one side or both sides of the positive electrode current collector.
  • the positive electrode current collector includes aluminum or an aluminum alloy.
  • the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer located on one side or both sides of the negative electrode current collector.
  • the negative electrode current collector includes nickel, nickel-plated copper, a nickel alloy, or a copper alloy.
  • the inner film layer includes one or more of polypropylene, ethylene-propylene copolymer, maleate-modified polypropylene, and butene-propylene copolymer.
  • the difference between the melting point of the first film layer and the melting point of the third adhesive layer is -5°C to 40°C (for example, -5°C, -3°C, 0°C, 3°C, 5°C, 10°C, 15°C, 20°C, 25°C, 30°C, 35°C, 40°C).
  • the melting point of the first film layer can be higher than the melting point temperature of the third adhesive layer, or the melting point of the first film layer can be lower than the melting point temperature of the third adhesive layer.
  • the difference between the melting point of the first film layer and the melting point temperature of the third adhesive layer is a negative value, it means that the melting point of the first film layer is lower than the melting point temperature of the third adhesive layer; when the difference between the melting point of the first film layer and the melting point temperature of the third adhesive layer is a positive value, it means that the melting point of the first film layer is higher than the melting point temperature of the third adhesive layer.
  • the insulating adhesive satisfies: the melting point of the second adhesive layer is greater than the melting point of the third adhesive layer, and the melting point of the second adhesive layer is greater than the melting point of the first adhesive layer, and the difference between the melting point of the third adhesive layer and the melting point of the first adhesive layer is -5°C to 25°C, and the difference between the melting point of the first film layer and the melting point of the third adhesive layer is -5°C to 40°C.
  • the first film layer includes modified polypropylene and/or propylene ethylene copolymer.
  • composition of the first adhesive layer is as follows: refer to the first adhesive layer in Example I-1;
  • the second adhesive layer is carried out with reference to the second adhesive layer in Example I-1;
  • the melting point of the third adhesive layer is 105.4°C & 120.8°C (i.e., the third adhesive layer includes a first melting region and a second melting region, wherein the temperature T1 of the melting peak of the first melting region is 105.4°C, and the temperature T2 of the melting peak of the second melting region is 120.8°C). See Table I-1 for details.
  • T1 is changed by changing the ratio of monomers of maleic anhydride-modified polypropylene in the first adhesive layer and T2 is changed by changing the ratio of monomers of propylene-ethylene copolymer, see Table I-1 for details.
  • Example I-3a except that the weight content of maleic anhydride modified with a melting point d1 of 105.4°C in the first adhesive layer is adjusted to 100%, and the weight content of propylene copolymer with a melting point f2 of 120.8°C in the third adhesive layer is adjusted to 100%, see Table I-1 for details.
  • Example I-3b except that the weight content of the maleic anhydride modified with a melting point d1 of 95.2°C in the first adhesive layer is adjusted to 100%, and the weight content of the propylene copolymer with a melting point f2 of 130.5°C in the third adhesive layer is adjusted to 100%, see Table I-1 for details.
  • Example I-3d except that d1 is changed by changing the ratio of the monomers of maleic anhydride modified polypropylene in the first adhesive layer, and f1 is changed by changing the ratio of the monomers of maleic anhydride modified polypropylene in the third adhesive layer.
  • d1 is changed by changing the ratio of the monomers of maleic anhydride modified polypropylene in the first adhesive layer
  • f1 is changed by changing the ratio of the monomers of maleic anhydride modified polypropylene in the third adhesive layer.
  • Example I-3c The method is carried out in accordance with Example I-3c, except that the insulating adhesive does not include a third adhesive layer.
  • the insulating adhesive does not include a third adhesive layer.
  • h represents the difference between the melting point of the third adhesive layer and the melting point of the first adhesive layer.
  • the positive electrode active material (97.6 parts by weight of lithium cobalt oxide), the conductive agent (1.35 parts by weight of conductive carbon black), the binder (1.05 parts by weight of PVDF) and the solvent (NMP) are stirred and evenly mixed, and then coated on the surfaces of both sides of the positive electrode collector (aluminum foil with a thickness of 10 ⁇ m) to form a positive electrode active material layer; it is dried and roll-pressed to obtain a positive electrode sheet, and the area of the positive electrode sheet not coated with the positive electrode active material layer can be welded with the positive electrode conductive material.
  • the positive electrode conductive material is aluminum, the first end of the positive electrode conductive material is a welding end, the welding end is welded to the positive electrode current collector, the second end opposite to the first end is a protruding end, a glue coating area is formed between the welding end and the protruding end, an insulating glue is arranged on the glue coating area, the insulating glue covers the surface of the positive electrode conductive material, and the surface of the first glue layer in the insulating glue away from the second glue layer is adjacent to the positive electrode conductive material.
  • the length of the positive electrode conductive material at the welding end of the positive electrode current collector is 30 mm.
  • the insulating glue uses the insulating glue of Example I and Comparative Example I-1, respectively, and its specifications are 0.1 mm thick, 6 mm wide, and 2.5 single-sided glue width.
  • Negative electrode sheet assembly The negative electrode active material (97 parts by weight of graphite), conductive agent (1.5 parts by weight of conductive carbon black), binder (1.5 parts by weight of styrene-butadiene rubber) and solvent (deionized water) are stirred and evenly mixed, and then coated on the surfaces of both sides of the negative electrode base fluid (copper foil with a thickness of 10 ⁇ m); it is dried and rolled to obtain a negative electrode sheet. The area of the negative electrode sheet not coated with the negative electrode active material layer can be welded with the negative electrode conductive material.
  • the negative electrode conductive material is nickel-plated copper.
  • the first end of the negative electrode conductive material is a welding end, which is welded to the negative electrode current collector.
  • the second end opposite to the first end is a protruding end.
  • a glue coating area is formed between the welding end and the protruding end.
  • An insulating glue is arranged on the glue coating area.
  • the insulating glue covers the surface of the negative electrode conductive material.
  • the surface of the first glue layer in the insulating glue away from the second glue layer is adjacent to the negative electrode conductive material.
  • the length of the negative electrode conductive material at the welding end of the negative electrode current collector is 30 mm.
  • the insulating glue uses the insulating glue of Example I and Comparative Example I-1, respectively, and its specifications are 0.1 mm thick, 6 mm wide, and 2.5 mm wide on one side.
  • Polyethylene substrate with a thickness of 7 ⁇ m Polyethylene substrate with a thickness of 7 ⁇ m.
  • lithium salt 10 parts by weight; organic solvent (ethylene carbonate (EC) 40 parts by weight, diethyl carbonate (DEC) 40 parts by weight, fluoroethylene carbonate (FEC) 5 parts by weight) 85 parts by weight, additive (PS) 5 parts by weight.
  • the positive electrode sheet assembly of step (1), the negative electrode sheet assembly of step (2) and the separator of step (3) are stacked in the order of positive electrode sheet assembly, separator and negative electrode sheet assembly, and then wound to obtain a battery cell; the battery cell is placed in a packaging film of step (5), and the electrolyte of step (4) is injected into the packaging film, and a lithium-ion battery is obtained through vacuum packaging, standing, forming, shaping, sorting and other processes.
  • Example I and Comparative Example I-1 were subjected to sealing test, whole device drop test and 135° C. hot box test respectively.
  • the results obtained from Example I and Comparative Example I-1 are recorded in Table I-2.
  • Group II of Examples is used to illustrate the insulating adhesive and packaging film of the present disclosure.
  • Example II-1 The same process is carried out as in Example I-1, except that the melting point of the first film layer in the selected packaging film is 140.8°C, as shown in Table II-1.
  • Example II-1 The process is carried out in accordance with Example I-1, except that the melting point of the first film layer in the selected packaging film is 120.3° C., as shown in Table II-1.
  • Example II-1 The process is carried out in accordance with Example I-1, except that the melting point of the first film layer in the selected packaging film is 165.6°C, as shown in Table II-1.
  • Example II The batteries obtained in Example II were subjected to sealing test, whole device drop test, 130° C. hot box test and 140° C. hot box test. The results obtained in Example II are recorded in Table II-1.
  • the examples show that the batteries made of the insulating adhesive and packaging film of the examples have a high passing rate in the sealing test and a high passing rate in the whole machine drop test, indicating that the sealing effect of the battery is good and that the battery can provide a closed space when thermal runaway does not occur.
  • the 130°C and 140°C hot box tests have a high passing rate, indicating that when thermal runaway occurs, the battery can be opened in time to provide heat dissipation for the battery, thereby improving the safety performance of the battery.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Laminated Bodies (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

本公开涉及电池技术领域,具体涉及一种绝缘胶及包括该绝缘胶的电池。绝缘胶至少包括三个熔融区域,其中,第一熔融区域的熔融峰a1为95℃-115℃,第二熔融区域的熔融峰a2为115℃-130℃,第三熔融区域的熔融峰a3为140℃-165℃,第三熔融区域的熔融峰a3的温度T3与第一熔融区域的熔融峰a1的温度T1满足如下关系式:b=T3-T1,b的单位为℃,其中,b为25℃-70℃。本公开的绝缘胶中各层之间的粘结性较好,在电解液的浸泡下不会出现分层,同时在电芯发生热失控时能够兼具高温开口的性能;包括该绝缘胶的电池在兼具安全性能高的同时,密封壳的密封性能好,不会出现绝缘胶分层导致密封壳漏液。

Description

一种绝缘胶和电池 技术领域
本公开涉及电池技术领域,具体涉及一种绝缘胶及包括该绝缘胶的电池。
发明背景
锂离子电池因为能量密度大、电压高、循环次数长等优点,已被广泛应用于消费类电子产品、电动汽车、电动工具等产品中。近年来,随着电芯的快充、倍放要求不断提升,对电芯的电性能和使用过程中的安全要求也进一步提高;当电芯进行快充时,极耳处电流密度最高,过度倍放过程中,会导致电芯温度急剧升高,此时隔膜热收缩导致正负极短路、SEI膜分解,电芯内部温度急剧升高,从而引起电芯起火爆炸;因此,防止电芯热失控,提高锂离子电池的安全性能至关重要。
发明内容
电池由正极组件、负极组件、隔离膜、包装膜、电解液组成,其中电芯壳体因需要与外界连通导电,极耳胶同铝塑膜(包装膜)热封形成密封壳,从而阻隔水分、空气,保证电芯的密封性能。但是,在电解液的长期浸泡下,极耳胶层间结合力下降,发生分层,使密封壳出现封边开口漏液的情况,电芯内部水汽进入,从而降低电池的安全性能。为了解决现有技术中存在的上述技术问题,本公开提供了一种绝缘胶及包括该绝缘胶的电池。本公开的绝缘胶中各层之间的粘结性较好,在电解液的浸泡下不会出现分层,同时在电芯发生热失控时能够兼具高温开口的性能;包括该绝缘胶的电池在兼具安全性能高的同时,密封壳的密封性能好,不会出现绝缘胶分层导致密封壳漏液。
为了实现上述目的,本公开第一方面提供了一种绝缘胶,其中,所述绝缘胶至少包括三个熔融区域,其中,第一熔融区域的熔融峰a1为95℃-115℃,第二熔融区域的熔融峰a2为115℃-130℃,第三熔融区域的熔融峰a3为140℃-165℃,所述第三熔融区域的熔融峰a3的温度T3与所述第一熔融区域的熔融峰a1的温度T1满足如下关系式:b=T3-T1,b的单位为℃,其中,b为25℃-70℃。
在一实例中,b为40℃-60℃;
和/或,所述绝缘胶至少包括第一胶层和第二胶层,所述第二胶层位于所述第一胶层一侧的表面,所述第一胶层的熔点为95℃-130℃,第二胶层的熔点为140℃-170℃。
在一实例中,所述绝缘胶包括第三胶层,所述第三胶层位于第二胶层中远离所述第一胶层一侧的表面,所述绝缘胶满足:所述第二胶层的熔点>所述第三胶层的熔点,和/或,所述第二胶层的熔点>所述第一胶层的熔点;
和/或,所述第三胶层的熔点为95℃-130℃;
和/或,所述第三胶层的熔点与所述第一胶层的熔点温度之差为-5℃~25℃。
在一实例中,所述第一胶层的熔点包括所述第一熔融区域的熔融峰a1和所述第二熔融区域的熔融峰a2;
和/或,所述第二胶层的熔点包括所述第三熔融区域的熔融峰a3;
和/或,所述第三胶层的熔点包括所述第一熔融区域的熔融峰a1和所述第二熔融区域 的熔融峰a2。
本公开第二方面提供了一种电池,该电池包括第一方面所述的绝缘胶。
在一实例中,所述电池包括极片组件和包装膜,所述极片组件包括极片和极片导电材料,所述极片包括集流体以及位于所述集流体一侧或两侧表面的活性材料层,所述极片导电材料位于所述集流体一端,所述导电材料的第一端为焊接端,所述焊接端与所述集流体焊接相连,与所述第一端相对的第二端为探出端,所述焊接端与所述探出端之间形成涂胶区域,所述涂胶区域上设置有绝缘胶,所述绝缘胶覆盖在所述导电材料的表面,所述绝缘胶中第一胶层远离第二胶层一侧的表面与所述导电材料相邻,所述包装膜与绝缘胶连接在一起形成密封壳,所述极片组件位于由所述密封壳形成的密闭空间中,所述包装膜包括与所述绝缘胶中第二胶层或第三胶层相连的内膜层、位于内膜层表面的金属层以及位于金属层表面的外膜层,所述内膜层包括直接与所述绝缘胶中第二胶层或第三胶层相连的第一膜层和位于第一膜层表面的第二膜层,所述第一膜层的熔点为120℃-165℃,优选为130℃-145℃;
和/或,所述第一膜层的熔点与所述第二胶层或所述第三胶层的熔点之差为-5℃~40℃;
和/或,所述第一膜层包括改性聚丙烯和/或丙烯乙烯共聚物;
和/或,所述改性聚丙烯包括马来酸酐改性聚丙烯、茂金属改性、乙丙烯共聚物和硅烷偶联改性聚丙烯中的一种或多种。
在一实例中,所述包装膜与所述绝缘胶之间的热封拉力为Y±0.5,单位为N/mm,所述电池的温度为T,单位为℃,则所述电池满足如下关系式:Y=-0.04572×T+5.779,其中,T为20℃-125℃。
通过上述技术方案,本公开与现有技术相比至少具有以下优势:
本公开的绝缘胶至少包括三个熔融区域,并对三个熔融区域的熔融峰进行了特定范围的限定,同时通过限定第一熔融区域的熔融峰(最低温度区域)与第三熔融区域的熔融峰(最高温度区域)的温度之差的关系,提高了绝缘胶中各层之间的粘结性,同时兼具高温开口的性能,从而可以确保在未发生热失控时,电池不漏液,在发生热失控时,通过绝缘胶的熔融能够为电池提供散热通道,提高电池的安全性能。
本公开的其它特点和优点将在随后的具体实施方式部分予以详细说明。
附图说明
图1所示为本公开中实施例I-1的绝缘胶的DSC图。
图2所示为本公开中包括两层胶层的绝缘胶的结构示意图。
图3所示为本公开中包括三层胶层的绝缘胶的结构示意图。
图4所示本公开中极片组件的结构示意图。
具体实施方式
以下对本公开的具体实施方式进行详细说明。应当理解的是,此处所描述的具体实施方式仅用于说明和解释本公开,并不用于限制本公开。本文中,在没有特别说明的情况下,数据范围均包括端点。
本公开第一方面提供了一种绝缘胶,其中,所述绝缘胶至少包括三个熔融区域,其中,第一熔融区域的熔融峰a1为95℃-115℃,第二熔融区域的熔融峰a2为115℃-130℃,第三熔融区域的熔融峰a3为140℃-165℃,所述第三熔融区域的熔融峰a3的温度T3与所述第一熔融区域的熔融峰a1的温度T1满足如下关系式:b=T3-T1,b的单位为℃,其中,b 为25℃-70℃。
图1为本公开绝缘胶的DSC图,从图1中可以看出,所述绝缘胶至少包括三个熔融区域。
本公开的发明人经研究发现,现有技术中的极耳胶在电解液的浸泡下容易发生分层,使密封壳出现封边开口漏液,是由于现有技术中的极耳胶存在两个熔融区域,且这两个熔融区域的熔融峰的温度差距较大,从而使极耳胶中胶层之间的粘结性较低,在电解液的浸泡下容易出现分层。
为了提高绝缘胶中各层之间的粘结性,同时使绝缘胶兼具高温开口的性能,本公开的绝缘胶至少包括三个熔融区域,并将三个熔融区域的熔融峰限定在特定范围内,第一熔融区域的熔融峰a1为95℃-115℃(例如,95℃、100℃、105℃、110℃、115℃),第二熔融区域的熔融峰a2为115℃-130℃(例如,115℃、118℃、120℃、122℃、125℃、128℃、130℃),第三熔融区域的熔融峰a3为140℃-165℃(例如,140℃、145℃、150℃、155℃、160℃、165℃),所述第三熔融区域的熔融峰a3的温度T3与所述第一熔融区域的熔融峰a1的温度T1满足如下关系式:b=T3-T1,b的单位为℃,其中,b为25℃-70℃(例如,25℃、30℃、35℃、40℃、45℃、50℃、55℃、60℃、65℃、70℃)。在本公开中,熔融峰表述熔融吸热峰。
本公开的绝缘胶包括至少三个熔融区域,并将绝缘胶的三个熔融区域的熔融峰限定在上述特定范围时,从三个熔融区域的熔融峰的温度可以看出,在温度差距较大的第一熔融区域和第三熔融区域之间存在第二熔融区域,第二熔融区域的熔融峰a2与第一熔融区域的熔融峰a1的温度差距较小,并且第二熔融区域的熔融峰a2与第三熔融区域的熔融峰a1的温度差距较小,通过第二熔融区域的过渡可以将温度较低的第一熔融区域与温度较高的第三熔融区域连接起来,从而能够提高绝缘胶层中各层之间的粘结性能,使绝缘胶在电解液的浸泡下不会出现分层。同时将第一熔融区域的熔融峰a1限定在上述特定范围时,第一熔融区域的维卡转化点较低,热变形温度较低,与常规极耳胶相比,在同等环境温度下,第一熔融区域更容易发生热变形,从而可以确保在电池发生热失控(此时电池的温度达到100-120℃)时,绝缘胶熔融能够开口形成散热通道,提高电池的安全性能。同时限定第三熔融区域的熔融峰a3的温度T3与第一熔融区域的熔融峰a1的温度T1之差b限定在特定范围时,可以使绝缘胶的胶层之间的分子间的结晶峰更接近,各分子间交联度增加,胶层的材料之间的结晶度增加,从而可以提高胶层之间的贴合性能,使胶层之间结合更紧密,避免在电解液浸泡过程中发生分层,使得水汽通过率过高,进而避免引起电池的鼓胀漏液的问题,同时还可以防止绝缘胶过度熔融,从而避免电池的包装膜中的金属层与电池中的导电材料距离过近,造成短路。
在本公开中,通过对绝缘胶的熔融区域以及熔融区域的熔融峰和熔融峰温度之差的限定,已经能够使绝缘胶实现比现有技术更高的粘结性能和高温开口性能。为了进一步提高效果,可以对其中一个或多个技术特征做进一步优选。
在一实例中,b为40℃-60℃。将b限定在上述特定范围,可以进一步提高绝缘胶的粘结性能,同时进一步提高电池的安全性能。
在一实例中,所述绝缘胶至少包括第一胶层和第二胶层,所述第二胶层位于所述第一胶层一侧的表面,所述第一胶层的熔点为95℃-130℃(例如,95℃、100℃、105℃、110℃、115℃、120℃、125℃、130℃)。在本公开中,所述熔点表示在加热过程中,熔融吸热峰峰值对应的温度。
在一实例中,所述第一胶层的熔点为100℃-110℃。
在一实例中,第二胶层的熔点为140℃-170℃(例如,140℃、145℃、150℃、155℃、160℃、165℃、170℃)。将所述第二胶层的熔点限定在上述特定范围时,可以使第二胶层在封头加热过程中避免过度熔融,导致导电材料和包装膜金属层接触造成短路。
在一实例中,第二胶层的熔点为155℃-165℃。
如图2所示,所述绝缘胶4包括两层胶层,第一胶层41和第二胶层42,所述第二胶层42位于所述第一胶层41一侧的表面。
在一实例中,所述第一胶层的熔点包括所述第一熔融区域的熔融峰a1和所述第二熔融区域的熔融峰a2。
在一实例中,所述第二胶层的熔点包括所述第三熔融区域的熔融峰a3。
当所述绝缘胶包括两层胶层时,所述绝缘胶包括三个熔融区域,第一胶层包括第一熔融区域和第二熔融区域,第二胶层包括第三熔融区域。此时,由于第一胶层包括第二熔融区域,第一胶层与第二胶层之间的熔融峰的温度差距较小,因此包括两层胶层的绝缘胶,其胶层之间的粘结性较高,绝缘胶在电解液的浸泡下不会发生分层。
所述第一胶层的宽度和所述第二胶层宽度可以相同或不同。在本公开中,如图4所示,胶层的宽度的方向a与胶层环绕的方向垂直。
在一实例中,所述第二胶层的宽度小于所述第一胶层的宽度。
在一实例中,所述绝缘胶包括第三胶层,所述第三胶层位于第二胶层中远离所述第一胶层一侧的表面,所述绝缘胶满足:所述第二胶层的熔点>所述第三胶层的熔点,和/或,所述第二胶层的熔点>所述第一胶层的熔点。
在一实例中,所述绝缘胶满足:所述第二胶层的熔点>所述第三胶层的熔点,且第二胶层的熔点>所述第一胶层的熔点。所述绝缘胶中第一胶层的熔点、第二胶层的熔点和第三胶层的熔点满足上述特定关系时,同常规极耳胶相比,第一胶层和第三胶层热变形温度低(熔点较低),在同等温度下,第一胶层和第三胶层更易产生热变形,第三胶层和与第三胶层相邻的包装膜内层热熔后冷却重结晶,能够提高分子间交联,增强绝缘胶与包装膜内层的结合力,从而可以避免电芯跌落、高频振动中出现封边开口漏液;同时第二胶层(熔点较高)高温层可以防止造成过度熔融,避免包装膜金属层同导电材料距离过近,造成短路;当电芯达到高温100-120℃时(此时电芯发生热失控),第一胶层和导电材料间、第三层胶和包装膜内层间先发生熔融,热封拉力骤然减小,从而使导电材料处的包装膜和覆盖在导电材料表面的绝缘胶熔融开口形成散热通道,提高电池的安全性能。即当电芯未发生热失控时,绝缘胶与包装膜以及绝缘胶和导电材料之间结合紧密,为电芯提供密闭空间,当电芯发生热失控时,绝缘胶的第一层胶和第三层胶先发生熔融,导电材料处绝缘胶和包装膜及导电材料间结合力大幅度降低,使电芯内部因热失控形成的热冲力可以在导电材料密封位置冲开形成开口,为电芯提供散热通道,从而防止电芯热失控,提高电池的安全性能。
根据一种具体的实施方式,所述第三胶层的熔点为95℃-130℃(例如,95℃、100℃、105℃、110℃、115℃、120℃、125℃、130℃)。将第三胶层的熔点限定在上述特定范围,可以提升第三胶层的亲金属性能,从而使第三胶层与包装膜的内层膜粘结性能提升。
在一实例中,所述第三胶层的熔点为100℃-125℃。
在一实例中,所述第三胶层的熔点与所述第一胶层的熔点温度之差h为-5℃~25℃(例如,-5℃、-3℃、0℃、3℃、5℃、10℃、15℃、20℃、25℃)。将所述第三胶层的熔点与所述第一胶层的熔点温度之差限定在上述特定范围时,第一层胶和第三层胶的熔融热变形基本同步,在同等温度下,包装膜更易与第三层胶发生熔融冷却结晶,其结合力更强,提高了电芯的常温密封性能,同时当电芯高温发生热失控时,第一胶层与导电材料界面以及第三胶层与包装膜融合界面可先发生熔融,使得包装膜和导电材料的整体密封界面拉力衰减,界面更易开口,提供散热通道,避免电池起火燃烧。
可以理解的是,所述第三胶层的熔点可以比所述第一胶层的熔点温度高,或者所述第三胶层的熔点可以比所述第一胶层的熔点温度低。当所述第三胶层的熔点与所述第一胶层的熔点温度之差为负值时,表示所述第三胶层的熔点比所述第一胶层的熔点温度低;当所述第三胶层的熔点与所述第一胶层的熔点温度之差为正值时,表示所述第三胶层的熔点比所述第一胶层的熔点温度高。
在一实例中,所述第三胶层的熔点包括所述第一熔融区域的熔融峰a1和所述第二熔融区域的熔融峰a2。
如图3所示,所述绝缘胶4包括三层胶层,所述第三胶层43位于第二胶层42中远离所述第一胶层41一侧的表面。
当所述绝缘胶包括三层胶层时,所述绝缘胶包括三个熔融区域,第一胶层包括第一熔融区域和第二熔融区域,第二胶层包括第三熔融区域,第三胶层包括第一熔融区域和第二熔融区域。此时,第一胶层和第三胶层均包括第二熔融区域,第一胶层、第三胶层和第二胶层之间的熔融峰的温度差距较小,因此包括三层胶层的绝缘胶,其胶层之间的粘结性较高,绝缘胶在电解液的浸泡下不会发生分层。
在一实例中,所述第一胶层包括第一改性树脂。
在一实例中,所述第一改性树脂包括马来酸酐改性聚丙烯、丙烯酸改性聚丙烯、茂金属改性聚丙烯、丙乙烯共聚物和丁烯丙烯共聚物中的一种或多种。
在一实例中,所述第一改性树脂包括第一改性树脂A1和第一改性树脂A2,其中,所述第一改性树脂A1的熔点d1为95℃≤d1≤115℃,所述第一改性树脂A2的熔点d2为115℃<d2≤130℃,则以所述第一胶层的总重量为基准,所述第一改性树脂A1的重量含量≥50wt%(例如,50wt%、50.5wt%、55wt%、60wt%、65wt%、70wt%、75wt%、80wt%、85wt%、90wt%、95wt%、100wt%),所述第一改性树脂A2的重量含量≤50wt%(例如,0wt%、0.5wt%、1wt%、5wt%、10wt%、15wt%、20wt%、25wt%、30wt%、35wt%、40wt%、45wt%、49.5wt%、50wt%)。当所述第一胶层中,所述第一改性树脂A1的重量含量为100wt%时,表示第一胶层为第一改性树脂A1。当所述第一胶层中,所述第一改性树脂A2的重量含量为0wt%时,表示第一胶层中不存在第一改性树脂A2。
从第一改性树脂A1和第一改性树脂A2的熔点可知,所述第一胶层的熔点包括所述第一熔融区域的熔融峰a1和所述第二熔融区域的熔融峰a2。
在一实例中,所述第三胶层包括第二改性树脂。
在一实例中,所述第二改性树脂选自马来酸酐改性聚丙烯、丙烯酸改性聚丙烯、茂金属改性聚丙烯、丙乙烯共聚物和丁烯丙烯共聚物中的一种或多种。
在一实例中,所述第三胶层包括第二改性树脂,所述第三胶层包括第二改性树脂C1和第二改性树脂C2,其中,所述第二改性树脂C1的熔点f1为95℃≤f1≤115℃,所述第二改性树脂C2的熔点f2为115℃<f2≤130℃,则以所述第三胶层的总重量为基准,所述第二改性树脂C1的重量含量≥50wt%(例如,50wt%、50.5wt%、55wt%、60wt%、65wt%、70wt%、75wt%、80wt%、85wt%、90wt%、95wt%、100wt%),所述第二改性树脂C2的重量含量≤50wt%(例如,0wt%、0.5wt%、1wt%、5wt%、10wt%、15wt%、20wt%、25wt%、30wt%、35wt%、40wt%、45wt%、49.5wt%、50wt%)。当所述第三胶层中,所述第二改性树脂C1的重量含量为100wt%时,表示第三胶层为第二改性树脂C1。当所述第三胶层中,所述第二改性树脂C2的重量含量为0wt%时,表示第三胶层中不存在第二改性树脂C2。
从第二改性树脂C1和第二改性树脂C2的熔点可知,所述第三胶层的熔点包括所述第一熔融区域的熔融峰a1和所述第二熔融区域的熔融峰a2。
所述第一胶层的宽度、所述第二胶层的宽度和所述第三胶层的宽度各自可以相同或不同。
在一实例中,所述第二胶层的宽度<所述第一胶层的宽度,和/或所述第二胶层的宽度<所述第一胶层的宽度。
在一实例中,所述第二层胶包括聚丙烯、嵌段聚丙烯和共聚聚丙烯中一种或多种;其中,所述嵌段聚丙烯包括丙烯乙烯链段交替和/或丁烯丙烯链段交替,所述共聚聚丙烯包括乙烯丙烯共聚和/或丁烯丙烯共聚。
本公开第二方面提供了一种电池,该电池包括第一方面所述的绝缘胶。
在一实例中,所述电池包括极片组件和包装膜,所述极片组件包括极片和极片导电材料,所述极片包括集流体以及位于所述集流体一侧或两侧表面的活性材料层,所述极片导电材料位于所述集流体一端,所述导电材料的第一端为焊接端,所述焊接端与所述集流体焊接相连,与所述第一端相对的第二端为探出端,所述焊接端与所述探出端之间形成涂胶区域,所述涂胶区域上设置有绝缘胶,所述绝缘胶覆盖在所述导电材料的表面,所述绝缘胶中第一胶层远离第二胶层一侧的表面与所述导电材料相邻,所述包装膜与绝缘胶连接在一起形成密封壳,所述极片组件位于由所述密封壳形成的密闭空间中,所述包装膜包括与所述绝缘胶中第二胶层或第三胶层相连的内膜层、位于内膜层表面的金属层以及位于金属层表面的外膜层,所述内膜层包括直接与所述绝缘胶中第二胶层或第三胶层相连的第一膜层和位于第一膜层表面的第二膜层,所述第一膜层的熔点为120℃-165℃。
如图4所示,所述极片组件包括极片和极片导电材料,所述极片包括集流体1以及位于所述集流体1一侧或两侧表面的活性材料层2,所述极片导电材料3位于所述集流体1一端,所述导电材料3的第一端为焊接端311,所述焊接端311与所述集流1焊接相连,与所述第一端相对的第二端为探出端312,所述焊接端与所述探出端之间形成涂胶区域,所述涂胶区域上设置有绝缘胶4,所述绝缘胶4覆盖在所述导电材料3的表面,所述绝缘胶中第一胶层41远离第二胶层42一侧的表面与所述导电材料3相邻。
在一实例中,所述极片包括正极片和/或负极片。
在一实例中,所述正极片包括正极集流体以及位于所述正极集流体一侧或两侧表面的正极活性材料层。
在一实例中,所述正极集流体包括铝或铝合金。
在一实例中,所述负极片包括负极集流体以及位于所述负极集流体一侧或两侧表面的负极活性材料层。
在一实例中,所述负极集流体包括镍、铜镀镍、镍合金或铜合金。
在一实例中,所述内膜层包括聚丙烯、乙丙烯共聚物、马来酸苷改性聚丙烯和丁烯丙烯共聚物的一种或多种。
在一实例中,所述金属层包括铝、铜或不锈钢。
在一实例中,所述外膜层为保护层。所述外膜层包括聚酰胺(PA)、聚对苯二甲酸乙二醇酯(PET)和聚萘二甲酸乙二醇酯(PEN)中的一种或多种。
在一实例中,所述第一膜层的熔点为120℃-165℃(例如,120℃、125℃、130℃、135℃、140℃、145℃、150℃、155℃、160℃、165℃)。
在一实例中,所述第一膜层的熔点为130℃-145℃。
在一实例中,所述第一膜层的熔点与所述第三胶层的熔点之差为-5℃~40℃(例如,-5℃、-3℃、0℃、3℃、5℃、10℃、15℃、20℃、25℃、30℃、35℃、40℃)。当所述第一膜层的熔点与所述第三胶层的熔点之差符合上述特定范围的限定时,在同等热封温度下,第一膜层和第三胶层熔点低且比较接近,发生热熔后重结晶,分子间交联提高,两者间结合力提高,提高电芯安全性能,避免电芯跌落、高频振动中出现封边开口导致漏液。
可以理解的是,所述第一膜层的熔点可以比所述第三胶层的熔点温度高,或者所述第一膜层的熔点可以比所述第三胶层的熔点温度低。当所述第一膜层的熔点与所述第三胶层的熔点温度之差为负值时,表示所述第一膜层的熔点比所述第三胶层的熔点温度低;当所述第一膜层的熔点与所述第三胶层的熔点温度之差为正值时,表示所述第一膜层的熔点比所述第三胶层的熔点温度高。
在一实例中,所述绝缘胶满足:所述第二胶层的熔点>所述第三胶层的熔点,且第二胶层的熔点>所述第一胶层的熔点,且所述第三胶层的熔点与所述第一胶层的熔点温度之差为-5℃~25℃,且所述第一膜层的熔点与所述第三胶层的熔点之差为-5℃~40℃。
在一实例中,所述第一膜层包括改性聚丙烯和/或丙烯乙烯共聚物。
在一实例中,所述改性聚丙烯包括马来酸酐改性聚丙烯、茂金属改性、乙丙烯共聚物 和硅烷偶联改性聚丙烯中的一种或多种。
在一实例中,所述包装膜与所述绝缘胶之间的热封拉力为Y±0.5,单位为N/mm,所述电池的温度为T,单位为℃,则所述电池满足如下关系式:Y=-0.04572×T+5.779,其中,T为20℃-125℃(例如,20℃、30℃、40℃、50℃、60℃、70℃、80℃、90℃、100℃、110℃、120℃、125℃)。从上述关系式可以看出,所述包装膜与所述绝缘胶之间的热封拉力Y,随着温度的升高而减小,如此在电芯发生热失控时,包装膜与绝缘胶之间的热封拉力已经很小(例如,当电池的温度T为110℃时,Y=-0.04572×110+5.779=0.7498N/mm,此时热封拉力为0.7498±0.5),此时电芯内部产生的热力足以冲开包装膜与绝缘胶之间的连接,从而为热量的扩散提供通道,进而提升电池的安全性能。
所述包装膜与所述绝缘胶之间的热封拉力可以为Y±0.5,单位为N/mm。由于在测试包装膜与绝缘胶之间的热封拉力时,测得的数值根据取样位置存在差异,因此为了与实际相符,在Y的基础上加入了公差±0.5。
需要说明的是,本公开中“第一”、“第二”、“第三”等数字表示方式仅用于区分不同的物质或使用方式,不代表顺序的区别。
以下将通过实施例对本公开进行详细描述。本公开所描述的实施例仅是本公开一部分实施例,而不是全部的实施例。基于本公开中的实施例,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,都属于本公开保护的范围。
实施例I组用于说明本公开的绝缘胶。
实施例1-1
第一胶层的组成:第一改性树脂A1(马来酸酐改性聚丙烯,熔点d1为105.4℃)80重量份、第一改性树脂A2(丙乙烯共聚物,熔点d2为120.8℃)20重量份;
第二胶层的组成:共聚聚丙烯(熔点为161.5℃),100重量份。
绝缘胶的结构为两层结构,第一胶层的熔点为105.4℃&120.8℃(即第一胶层包括第一熔融区域和第二熔融区域,其中第一熔融区域的熔融峰的温度T1为105.4℃,第二熔融区域的熔融峰的温度T2为120.8℃);
第二胶层的熔点为161.5℃(即第二胶层包括第三熔融区域,第三熔融区域的熔融峰的温度T3为161.5℃)。
实施例I-2组
本组实施例用于说明当通过改变第一胶层中马来酸酐改性聚丙烯的单体的比例关系使T1改变和/或通过改变第二胶层中共聚聚丙烯的单体的比例关系使T3改变从而引起b发生改变时产生的影响。
本实施例组参照实施例I-1进行,所不同的是,通过改变T1和/或T3引起b的变化,具体参见表I-1。
实施例I-3组
实施例I-3a
第一胶层的组成:参照实施例I-1中的第一胶层进行;
第二胶层的组成:参照实施例I-1中第二胶层进行;
第三胶层的组成:第二改性树脂C1(马来酸酐改性聚丙烯,熔点f1为105.4℃)80重量份、第二改性树脂C2(丙乙烯共聚物,熔点f2为120.8℃)20重量份。
绝缘胶的结构为三层结构,第一胶层参照实施例I-1中的第一胶层进行;
第二胶层参照实施例I-1中的第二胶层进行;
第三胶层的熔点为105.4℃&120.8℃(即第三胶层包括第一熔融区域和第二熔融区域,其中第一熔融区域的熔融峰的温度T1为105.4℃,第二熔融区域的熔融峰的温度T2为120.8℃)。具体参见表I-1。
实施例I-3b
参照实施例I-3a进行,所不同的是,通过改变第一胶层中马来酸酐改性聚丙烯的单体的比例关系使T1改变和丙乙烯共聚物的单体的比例关系使T2改变,具体参见表I-1。
实施例I-3c
参照实施例I-3a进行,所不同的是,将第一胶层中熔点d1为105.4℃的马来酸酐改性的重量含量调整为100%,且将第三胶层中熔点f2为120.8℃的丙乙烯共聚物的重量含量调整为100%,具体参见表I-1。
实施例I-3d
参照实施例I-3b进行,所不同的是,将第一胶层中熔点d1为95.2℃的马来酸酐改性的重量含量调整为100%,且将第三胶层中熔点f2为130.5℃的丙乙烯共聚物的重量含量调整为100%,具体参见表I-1。
实施例I-3e
参照实施例I-3d进行,所不同的是,通过改变第一胶层中马来酸酐改性聚丙烯的单体的比例关系使d1改变,且通过改变第三胶层中马来酸酐改性聚丙烯的单体的比例关系使f1改变,具体参见表I-1。
对比例I-1
参照实施例I-3c进行,所不同的是,绝缘胶不包括第三胶层,具体参见表I-1。
表I-1a
表I-1b

-表示不存在;
h表示第三胶层的熔点与所第一胶层的熔点温度之差。
制备例I-1
(1)正极片组件
将正极活性材料(钴酸锂97.6重量份)、导电剂(导电炭黑1.35重量份)、粘结剂(PVDF1.05重量份)和溶剂(NMP)搅拌均匀混合后涂在正极集流体(厚度为10μm铝箔)两侧表面形成正极活性材料层;将其进行干燥、辊压,得到正极片,正极片未涂覆正极活性材料层的区域可焊接正极导电材料。
正极导电材料为铝,正极导电材料的第一端为焊接端,焊接端与正极集流焊接相连,与第一端相对的第二端为探出端,焊接端与探出端之间形成涂胶区域,涂胶区域上设置有绝缘胶,绝缘胶覆盖在正极导电材料的表面,绝缘胶中第一胶层远离第二胶层一侧的表面与正极导电材料相邻。正极导电材料在正极集流体焊接端长度为30mm。绝缘胶分别使用实施例I组和对比例例I-1的绝缘胶,其规格为0.1mm厚6mm宽2.5单边胶宽。
(2)负极片组件:将负极活性材料(石墨97重量份)、导电剂(导电炭黑1.5重量份)、粘结剂(丁苯橡胶1.5重量份)和溶剂(去离子水)搅拌均匀混合后涂在在负极基流体(厚度为10μm铜箔)两侧表面;将其进行干燥、辊压,得到负极片,负极片未涂覆负极活性材料层的区域可焊接负极导电材料。
负极导电材料为铜镀镍,负极导电材料的第一端为焊接端,焊接端与负极集流焊接相连,与第一端相对的第二端为探出端,焊接端与探出端之间形成涂胶区域,涂胶区域上设置有绝缘胶,绝缘胶覆盖在负极导电材料的表面,绝缘胶中第一胶层远离第二胶层一侧的表面与负极导电材料相邻。负极导电材料在负极集流体焊接端长度为30mm。绝缘胶分别使用实施例I组和对比例例I-1的绝缘胶,其规格为0.1mm厚6mm宽2.5单边胶宽
(3)隔膜
厚度为7μm的聚乙烯基材。
(4)电解液
在充满氩气的手套箱中(H2O<0.1ppm,O2<0.1ppm),将有机溶剂按混合均匀,然后再往其中快速加入充分干燥的锂盐,溶解后加入添加剂,可得到所需的电解液。其中,锂盐:10重量份;有机溶剂(碳酸乙烯酯(EC)40重量份、碳酸二乙酯(DEC)40重量份、氟代碳酸乙烯酯(FEC)5重量份)85重量份,添加剂(PS)5重量份。
(5)包装膜
铝塑膜。
(6)电池的制备
将步骤(1)正极片组件、步骤(2)的负极片组件和步骤(3)的隔膜按照正极片组件、隔膜和负极片组件的顺序层叠设置后,再进行卷绕得到电芯;将电芯置于步骤(5)的包装膜中,将步骤(4)的电解液注入包装膜中,经过真空封装、静置、化成、整形、分选等工序,获得锂离子电池。
测试例I-1
1、热箱测试
(1)130℃热箱测试
25℃±3℃环境下,0.2C放电至截止电压3.0V,静置10min;0.5C恒流恒压充至上限电压4.2V,截止电流0.02C,25℃±3℃测试满电状态电压、内阻、厚度,把满电电芯放入试验箱中,试验箱以(5±2)℃/min的温升速率进行升温,当箱内温度达到130℃±2℃后恒温持续60min;测试完成后,观察电芯是否起火。起火则不通过,不起火则通过。每个样品共测试十次,结果用“通过次数/10”表示,例如“10/10”表示10次均通过,“5/10”表示10次测试中有5次通过。
(2)135℃热箱测试
25℃±3℃环境下,0.2C放电至截止电压3.0V,静置10min;0.5C恒流恒压充至上限电压4.2V,截止电流0.02C,25℃±3℃测试满电状态电压、内阻、厚度,把满电电芯放入试验箱中,试验箱以(5±2)℃/min的温升速率进行升温,当箱内温度达到135℃±2℃后恒温持续60min;测试完成后,观察电芯是否起火。起火则不通过,不起火则通过。每个样品共测试十次,结果用“通过次数/10”表示,例如“10/10”表示10次均通过,“5/10”表示10次测试中有5次通过。
(3)140℃热箱测试
25℃±3℃环境下,0.2C放电至截止电压3.0V,静置10min;0.5C恒流恒压充至上限电压4.2V,截止电流0.02C,25℃±3℃测试满电状态电压、内阻、厚度,把满电电芯放入试验箱中,试验箱以(5±2)℃/min的温升速率进行升温,当箱内温度达到140℃±2℃后恒温持续60min;测试完成后,观察电芯是否起火。起火则不通过,不起火则通过。每个样品共测试十次,结果用“通过次数/10”表示,例如“10/10”表示10次均通过,“5/10”表示10次测试中有5次通过。
2、整机跌落测试
将电芯装机后,25℃±3℃环境下,0.2C放电至截止电压3.0V,静置10min;0.5C恒流恒压充电至50%SOC,1.5m高度花岗岩跌落电芯极耳面,往复20次,电芯开口为失效,不开口即为通过。每个样品共测试十次,结果用“通过次数/10”表示,例如“10/10”表示10次均通过,“5/10”表示10次测试中有5次通过。
3、密封测试
25℃±3℃环境下,0.2C放电至下限电压(3V),静置10min,将电池放在25℃恒温箱中,按照0.7C恒流充满电(100%SOC),截止电流0.02C,满电后,将电芯存储在60℃&95RH(湿度)环境中,每隔3D测试电池本体厚度,膨胀率超过10%为失效;膨胀率未超过10%为通过,记录30D内的电芯通过比例。每个样品共测试十次,结果用“通过次数/10”表示,例如“10/10”表示10次均通过,“5/10”表示10次测试中有5次通过。
4、开口测试
25℃±3℃环境下,0.2C放电至下限电压3V,静置10min,将电池放在25℃恒温箱中,按照0.7C恒流充满电(100%SOC),截止电流0.02C,满电后,将电池分别放置在120℃和130℃环境中,2min内观察电池顶部是否开口或者电解液是否流出,开口或流出为通过,没有开口或者未有电解液流出则表示未通过。每个样品共测试十次,结果用“通过次数/10” 表示,例如“10/10”表示10次均通过,“5/10”表示10次测试中有5次通过。
将实施例I组和对比例I-1所得的电池分别进行密封测试、整机跌落测试和135℃热箱测试。将实施例I组和对比例I-1所得结果记于表I-2中。
表I-2
通过表I-2可以看出,通过对比例和实施例可以看出,实施例的绝缘胶制得的电池的密封测试通过情况提升,整机跌落测试通过情况明显提升,135℃热箱测试通过情况明显提升,说明本公开的绝缘胶,通过对绝缘胶的熔融区域以及熔融区域的熔融峰和熔融峰温度之差的限定,提高了绝缘胶的粘结性能和高温开口性能。
实施例II组用于说明本公开的绝缘胶和包装膜。
实施例II-1
参照实施例I-1进行,所不同的是,选用的包装膜中第一膜层的熔点为140.8℃,具体参见表II-1。
实施例II-2
参照实施例I-1进行,所不同的是,选用的包装膜中第一膜层的熔点为120.3℃,具体参见表II-1。
实施例II-3
参照实施例I-1进行,所不同的是,选用的包装膜中第一膜层的熔点为165.6℃,具体参见表II-1。
将实施例II组所得电池分别进行密封测试、整机跌落测试、130℃热箱测试和140℃热箱测试。将实施例II组所得结果记于表II-1中。
表II-1

通过表II-1可以看出,通过实施例可以看出,实施例的绝缘胶和包装膜制得的电池的密封测试通过情况较高,整机跌落测试通过情况较高,说明电池的密封效果较好,在电池未发生热失控时,能够为电池提供密闭空间;130℃和140℃热箱测试通过情况较高,说明在电池发生热失控时,能够及时开口,为电池提供散热通过,提高电池的安全性能。
以上详细描述了本公开的优选实施方式,但是,本公开并不限于此。在本公开的技术构思范围内,可以对本公开的技术方案进行多种简单变型,包括各个技术特征以任何其它的合适方式进行组合,这些简单变型和组合同样应当视为本公开所公开的内容,均属于本公开的保护范围。

Claims (15)

  1. 一种绝缘胶,其中,所述绝缘胶至少包括三个熔融区域,其中,第一熔融区域的熔融峰a1为95℃-115℃,第二熔融区域的熔融峰a2为115℃-130℃,第三熔融区域的熔融峰a3为140℃-165℃,所述第三熔融区域的熔融峰a3的温度T3与所述第一熔融区域的熔融峰a1的温度T1满足如下关系式:b=T3-T1,b的单位为℃,其中,b为25℃-70℃。
  2. 根据权利要求1所述的绝缘胶,其中,b为40℃-60℃;
    和/或,所述绝缘胶至少包括第一胶层和第二胶层,所述第二胶层位于所述第一胶层一侧的表面,所述第一胶层的熔点为95℃-130℃,第二胶层的熔点为140℃-170℃。
  3. 根据权利要求1或2所述的绝缘胶,其中,所述绝缘胶包括第三胶层,所述第三胶层位于第二胶层中远离所述第一胶层一侧的表面,所述绝缘胶满足:所述第二胶层的熔点>所述第三胶层的熔点,和/或,所述第二胶层的熔点>所述第一胶层的熔点。
  4. 根据权利要求3所述的绝缘胶,其中,所述第三胶层的熔点为95℃-130℃;
    和/或,所述第三胶层的熔点与所述第一胶层的熔点温度之差为-5℃~25℃。
  5. 根据权利要求1-4中任一项所述的绝缘胶,其中,所述第一胶层的熔点包括所述第一熔融区域的熔融峰a1和所述第二熔融区域的熔融峰a2;
    和/或,所述第二胶层的熔点包括所述第三熔融区域的熔融峰a3。
  6. 根据权利要求3-5中任一项所述的绝缘胶,其中,所述第三胶层的熔点包括所述第一熔融区域的熔融峰a1和所述第二熔融区域的熔融峰a2。
  7. 根据权利要求1-6中任一项所述的绝缘胶,其中,所述第一胶层包括第一改性树脂,所述第一改性树脂包括第一改性树脂A1和第一改性树脂A2,其中,所述第一改性树脂A1的熔点d1为95℃≤d1≤115℃,所述第一改性树脂A2的熔点d2为115℃<d2≤130℃,则以所述第一胶层的总重量为基准,所述第一改性树脂A1的重量含量≥50wt%,所述第一改性树脂A2的重量含量≤50wt%。
  8. 根据权利要求3-7中任一项所述的绝缘胶,其中,所述第三胶层包括第二改性树脂,所述第三胶层包括第二改性树脂C1和第二改性树脂C2,其中,所述第二改性树脂C1的熔点f1为95℃≤f1≤115℃,所述第二改性树脂C2的熔点f2为115℃<f2≤130℃,则以所述第三胶层的总重量为基准,所述第二改性树脂C1的重量含量≥50wt%,所述第二改性树脂C2的重量含量≤50wt%。
  9. 根据权利要求7或8所述的绝缘胶,其中,所述第一改性树脂包括马来酸酐改性聚丙烯、丙烯酸改性聚丙烯、茂金属改性聚丙烯、丙乙烯共聚物和丁烯丙烯共聚中的一种或多种;
    和/或,所述第二胶层包括聚丙烯、嵌段聚丙烯和共聚聚丙烯中一种或多种;其中,所述嵌段聚丙烯包括丙烯乙烯链段交替和/或丁烯丙烯链段交替,所述共聚聚丙烯包括乙烯丙烯共聚和/或丁烯丙烯共聚。
  10. 根据权利要求8或9所述的绝缘胶,其中,所述第二改性树脂包括马来酸酐改性聚丙烯、丙烯酸改性聚丙烯、茂金属改性聚丙烯、丙乙烯共聚物和丁烯丙烯共聚的一种或多种。
  11. 一种电池,其特征在于,所述电池包括权利要求1-10中任一项所述的绝缘胶。
  12. 根据权利要求11所述的电池,其中,所述电池包括极片组件和包装膜,所述极片组件包括极片和极片导电材料,所述极片包括集流体以及位于所述集流体一侧或两侧表面的活性材料层,所述极片导电材料位于所述集流体一端,所述导电材料的第一端为焊接端,所述焊接端与所述集流体焊接相连,与所述第一端相对的第二端为探出端,所述焊接端与所述探出端之间形成涂胶区域,所述涂胶区域上设置有绝缘胶,所述绝缘胶覆盖在所述导电材料的表面,所述绝缘胶中第一胶层远离第二胶层一侧的表面与所述导电材料相邻, 所述包装膜与所述绝缘胶连接在一起形成密封壳,所述极片组件位于由所述密封壳形成的密闭空间中,所述包装膜包括与所述绝缘胶中第二胶层或第三胶层相连的内膜层、位于内膜层表面的金属层以及位于金属层表面的外膜层,所述内膜层包括直接与所述绝缘胶中第二胶层或第三胶层相连的第一膜层和位于第一膜层和金属层间的第二膜层,所述第一膜层的熔点为120℃-165℃,优选为130℃-145℃。
  13. 根据权利要求12所述的电池,其中,所述第一膜层的熔点与所述第二胶层或所述第三胶层的熔点之差为-5℃~40℃;
    和/或,所述第一膜层包括改性聚丙烯和/或丙烯乙烯共聚物。
  14. 根据权利要求13所述的电池,其中,所述改性聚丙烯包括马来酸酐改性聚丙烯、茂金属改性、乙丙烯共聚物和硅烷偶联改性聚丙烯中的一种或多种。
  15. 根据权利要求12-14中任一项所述的电池,其中,所述包装膜与所述绝缘胶之间的热封拉力为Y±0.5,单位为N/mm,所述电池的温度为T,单位为℃,则所述电池满足如下关系式:Y=-0.04572×T+5.779,其中,T为20℃-125℃。
PCT/CN2024/076294 2023-12-29 2024-02-06 一种绝缘胶和电池 Pending WO2025138403A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202311857380.6A CN120230494A (zh) 2023-12-29 2023-12-29 一种绝缘胶和电池
CN202311857380.6 2023-12-29

Publications (1)

Publication Number Publication Date
WO2025138403A1 true WO2025138403A1 (zh) 2025-07-03

Family

ID=96157574

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2024/076294 Pending WO2025138403A1 (zh) 2023-12-29 2024-02-06 一种绝缘胶和电池

Country Status (2)

Country Link
CN (1) CN120230494A (zh)
WO (1) WO2025138403A1 (zh)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014225378A (ja) * 2013-05-16 2014-12-04 株式会社日立製作所 タブリード用シール材、タブリードおよびリチウムイオン二次電池
WO2021100226A1 (ja) * 2019-11-22 2021-05-27 株式会社ケムソル 封止フィルム並びにそれを用いたタブリード及び二次電池
CN113871809A (zh) * 2021-09-27 2021-12-31 珠海冠宇电池股份有限公司 胶纸、极耳及电池
CN115280585A (zh) * 2020-03-04 2022-11-01 大日本印刷株式会社 金属端子用粘合性膜、金属端子用粘合性膜的制造方法、附带金属端子用粘合性膜的金属端子、使用了该金属端子用粘合性膜的蓄电器件和蓄电器件的制造方法
CN115362595A (zh) * 2020-04-02 2022-11-18 大日本印刷株式会社 金属端子用粘合性膜、金属端子用粘合性膜的制造方法、附带金属端子用粘合性膜的金属端子、蓄电器件和蓄电器件的制造方法
CN115668604A (zh) * 2019-11-22 2023-01-31 株式会社凯米索尔 封装膜以及使用其的极耳引线和二次电池
CN115986284A (zh) * 2023-01-18 2023-04-18 宁德新能源科技有限公司 电池和用电设备

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014225378A (ja) * 2013-05-16 2014-12-04 株式会社日立製作所 タブリード用シール材、タブリードおよびリチウムイオン二次電池
WO2021100226A1 (ja) * 2019-11-22 2021-05-27 株式会社ケムソル 封止フィルム並びにそれを用いたタブリード及び二次電池
CN115668604A (zh) * 2019-11-22 2023-01-31 株式会社凯米索尔 封装膜以及使用其的极耳引线和二次电池
CN115280585A (zh) * 2020-03-04 2022-11-01 大日本印刷株式会社 金属端子用粘合性膜、金属端子用粘合性膜的制造方法、附带金属端子用粘合性膜的金属端子、使用了该金属端子用粘合性膜的蓄电器件和蓄电器件的制造方法
CN115362595A (zh) * 2020-04-02 2022-11-18 大日本印刷株式会社 金属端子用粘合性膜、金属端子用粘合性膜的制造方法、附带金属端子用粘合性膜的金属端子、蓄电器件和蓄电器件的制造方法
CN113871809A (zh) * 2021-09-27 2021-12-31 珠海冠宇电池股份有限公司 胶纸、极耳及电池
CN115986284A (zh) * 2023-01-18 2023-04-18 宁德新能源科技有限公司 电池和用电设备

Also Published As

Publication number Publication date
CN120230494A (zh) 2025-07-01

Similar Documents

Publication Publication Date Title
US12537246B2 (en) Pouch film stack and secondary battery
CN106784998A (zh) 一种二次电池及加热装置
EP4220826A1 (en) Electrochemical device and electronic device containing same
US20240266646A1 (en) Pouch Film and Secondary Battery
US20240332686A1 (en) Tab and battery comprising tab
WO2025148747A1 (zh) 绝缘胶、极耳组件及二次电池
JP2025087886A (ja) 二次電池
CN108615827A (zh) 锂离子电池及其包装膜
CN111276665B (zh) 一种软包装锂离子电池
JP2016129105A (ja) タブリード
WO2025138403A1 (zh) 一种绝缘胶和电池
KR102945277B1 (ko) 파우치형 이차전지
KR101412660B1 (ko) 리튬 이차 전지용 포장 재료
CN118198676A (zh) 极耳胶和电化学装置
CN120266331A (zh) 软包型二次电池
CN222507782U (zh) 一种电池
US20260128427A1 (en) Pouch Film Stack and Secondary Battery
US20250372752A1 (en) Secondary battery and electronic device
JP7245570B1 (ja) タブリード封止用フィルム
CN114583291B (zh) 一种电芯配套用热响应安全单元及单体电池
JP2025542285A (ja) パウチ型二次電池
JP2025538265A (ja) パウチフィルム積層体及び二次電池
JP2026504181A (ja) パウチフィルム積層体、パウチ型電池ケースおよびパウチ型二次電池
CN120153526A (zh) 软包膜层叠体以及二次电池
WO2025200016A1 (zh) 二次电池及电子装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 24909375

Country of ref document: EP

Kind code of ref document: A1