WO2017008269A1 - Dispositif accumulateur d'énergie électrochimique et procédé de préparation de dispositif accumulateur d'énergie électrochimique - Google Patents

Dispositif accumulateur d'énergie électrochimique et procédé de préparation de dispositif accumulateur d'énergie électrochimique Download PDF

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Publication number
WO2017008269A1
WO2017008269A1 PCT/CN2015/084099 CN2015084099W WO2017008269A1 WO 2017008269 A1 WO2017008269 A1 WO 2017008269A1 CN 2015084099 W CN2015084099 W CN 2015084099W WO 2017008269 A1 WO2017008269 A1 WO 2017008269A1
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Prior art keywords
storage device
energy storage
electrochemical energy
adhesive layer
adhesive
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PCT/CN2015/084099
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English (en)
Chinese (zh)
Inventor
鲍晋珍
方宏新
阳超
喻鸿钢
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宁德时代新能源科技股份有限公司
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Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to PCT/CN2015/084099 priority Critical patent/WO2017008269A1/fr
Priority to CN201580080052.7A priority patent/CN107615549B/zh
Publication of WO2017008269A1 publication Critical patent/WO2017008269A1/fr

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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
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to the field of battery technologies, and in particular, to an electrochemical energy storage device and a method for preparing the electrochemical energy storage device.
  • an object of the present invention to provide an electrochemical energy storage device and a method of fabricating the same, which can improve its performance without affecting its other properties.
  • Security issues of abuse such as dropping, squeezing, rolling, etc.).
  • the invention provides an electrochemical energy storage device comprising a battery core, an electrolyte, and a package.
  • the battery core comprises a positive electrode sheet, a negative electrode sheet and a separator interposed between the positive electrode sheet and the negative electrode sheet; the electrolyte is impregnated with the battery core; and the package body houses the battery core and the electrolyte.
  • the electrochemical energy storage device also includes an adhesive layer.
  • the adhesive layer is located between the battery core and the package shell and fixes the battery core and the package shell; the adhesive layer is flow dynamic before curing and the adhesion between the adhesive shell and the package shell is less than or equal to 0.1 N/mm, and the adhesive After the adhesive layer is cured, the cell and the package are fixedly connected.
  • the invention provides a method of preparing an electrochemical energy storage device,
  • the electrochemical energy storage device for preparing the first aspect of the invention comprises the steps of: forming a positive electrode sheet, a negative electrode sheet, and a separator separated between the positive electrode sheet and the negative electrode sheet into a battery core; between the battery core and the packaging shell
  • the adhesive layer is set, the adhesive layer is flow dynamic and the adhesive force between the adhesive layer and the package shell is less than or equal to 0.1 N/mm; the battery core is filled into the package shell, the electrolyte is poured and sealed, and then the package is packaged.
  • the outer surface of the shell is heated or pressurized to effect curing of the adhesive layer to securely attach the cell to the package.
  • the method for preparing an electrochemical energy storage device of the invention is simple in process, easy to implement, and can be adapted to different temperature and humidity environments and has low requirements for action conditions.
  • the adhesive layer can be rearranged in the electrochemical energy storage device before curing, which is beneficial to improve the appearance flatness and energy density of the electrochemical energy storage device.
  • the interface between the adhesive layer and the electric core and the packaging shell is better, and the interface bonding problem such as wrinkling of the adhesive layer and wrinkling of the surface of the electric core does not occur. .
  • the adhesion between the adhesive layer and the cell and the package is more uniform, and the surface of the cell is torn during the fall, extrusion, and rolling test.
  • the flowability of the adhesive layer can stick the multi-face junction or the junction of the shaped cell, effectively solving the problem of edge picking at the junction.
  • FIG. 1 is a partially cutaway perspective view of an electrochemical energy storage device in accordance with an embodiment of the present invention
  • FIG. 2 is a partially cutaway perspective view of an electrochemical energy storage device in accordance with another embodiment of the present invention.
  • FIG. 3 is a schematic view showing the structure of an electrochemical energy storage device according to the present invention, which is schematically exaggerated in section, taken along line A-A of FIG. 1.
  • electrochemical energy storage device and method and apparatus for preparing the electrochemical energy storage device according to the present invention, comparative examples, test procedures, and test results are described below.
  • an electrochemical energy storage device includes: a cell 1, an electrolyte, and a package 2.
  • the battery cell 1 includes a positive electrode sheet, a negative electrode sheet, and a separator interposed between the positive electrode sheet and the negative electrode sheet; the electrolyte is impregnated with the battery core 1; and the package body 2 houses the battery core 1 and the electrolyte.
  • the electrochemical energy storage device also includes an adhesive layer 3.
  • the adhesive layer 3 is located between the battery core 1 and the package casing 2 and fixedly connects the battery core 1 and the package casing 2.
  • the adhesive layer 3 is flowable before curing and has a bonding force with the package 2 of 0.1 N/mm or less. After the adhesive layer 3 is cured, the cell 1 and the package 2 are fixedly connected.
  • the adhesive layer 3 is flow dynamic, it can be rearranged in the electrochemical energy storage device before the adhesive layer 3 is cured, which is advantageous. Improve the appearance flatness of the electrochemical energy storage device; since the adhesive layer 3 is flow dynamic, the adhesive will flow to a position where the overall thickness of the electrochemical energy storage device is small, and only a trace amount of adhesive is left at the glue application position.
  • the overall thickness of the electrochemical energy storage device can be increased without increasing the overall thickness of the electrochemical energy storage device, and the overall thickness of the electrochemical energy storage device is reduced, which helps to increase the energy density of the electrochemical energy storage device;
  • the adhesive The flow of the layer 3 makes it better to interface with the cell 1 and the package 2 without interfacial adhesion problems such as wrinkling of the adhesive layer 3, wrinkling of the surface of the cell 1, and an adhesive layer. 3
  • the bonding force between the battery core 1 and the packaging shell 2 is more uniform, and the surface of the battery core 1 is torn during the fall, extrusion and rolling test; the flow characteristics of the adhesive layer 3 are particularly suitable for the special-shaped battery. In the case, the multi-face junction or junction of the shaped cell can be stuck To solve the problem of the edge of the junction.
  • the adhesive layer 3 has a bonding force with the package shell 2 of 0.1 N/mm or less before curing, and is convenient for entering the shell.
  • the adhesive force between the adhesive layer 3 and the packaging shell 2 is greater than 0.1 N/mm, the adhesive layer 3 and the packaging shell 2 are directly bonded when the shell is inserted, and the adhesive layer 3 cannot be electrically charged.
  • the chemical energy storage device is rearranged, and the appearance flatness of the electrochemical energy storage device is not guaranteed.
  • the viscosity of the adhesive layer 3 before curing can be less than or equal to 100,000 mp.s to ensure that the adhesive layer 3 is flow dynamic.
  • the material of the adhesive layer 3 may be selected from a pressure-sensitive adhesive having no initial viscosity at normal temperature, and a heat-sensitive adhesive having no initial viscosity at normal temperature.
  • a pressure-sensitive adhesive having no initial viscosity at normal temperature may be selected from the group consisting of styrene-ethylene-butadiene-styrene block copolymer (SEBS), styrene-butadiene block copolymer (SEPS), and One or more of epoxidized styrene-isoprene-styrene block copolymers (ESIS).
  • SEBS styrene-ethylene-butadiene-styrene block copolymer
  • SEPS styrene-butadiene block copolymer
  • ESIS epoxidized styrene-isoprene-styrene block copolymers
  • the heat-sensitive adhesive having no initial tack at normal temperature may be selected from one or more of polyolefin, polyvinyl butyral (PVB), polyamide (PA), and polyester (PES).
  • the monomer of the polyolefin may be selected from one or more of ethylene, propylene, isoprene, vinyl acetate, butene, acrylic acid, acrylate, butadiene, and styrene.
  • the polyolefin may be selected from the group consisting of polyethylene (PE), polypropylene (PP), polyisoprene (PI), polystyrene (PS), ethylene-vinyl acetate copolymer (EVA), ethylene- Ethyl acrylate copolymer (EEA), ethylene-acrylic acid copolymer (EAA), styrene-isoprene-styrene copolymer (SIS), and styrene-butadiene-styrene block copolymer (SBS) One or several of them.
  • the reactive adhesive may be selected from one or more of an epoxy resin, a phenol resin, and a urea resin.
  • the pressure-sensitive adhesive having no initial tack at normal temperature refers to a pressure which does not cause adhesion to an object when a short-term contact occurs between the object and the pressure-sensitive adhesive under normal pressure at a normal temperature.
  • Sensitive adhesive In the present application, the heat-sensitive adhesive refers to a type of glue which can be melted after heating and can be bonded and solidified after being cooled.
  • the heat-sensitive adhesive having no initial tack at normal temperature refers to a heat-sensitive adhesive which does not cause adhesion to an object when a short-term contact occurs between the object and the heat-sensitive adhesive at normal temperature.
  • Agent refers to a non-adhesive property of the adhesive layer in an initial state, and a chemical reaction occurs between the components of the adhesive layer or the environmental substance in contact under heat, organic solvent or acidic conditions to cause cohesiveness. Adhesive.
  • the adhesive layer 3 may have a single layer structure.
  • the adhesive layer 3 may have an N-layer structure, and N is an integer of 2 or more.
  • the material of the sub-layer 31 of the adhesive layer 3 near the outer surface of the cell 1 may be selected from a pressure-sensitive adhesive having no initial tack at normal temperature or a heat-sensitive adhesive having no initial tack at normal temperature.
  • the outer surface of the battery cell 1 is tempered at room temperature and subsequently heated or pressurized to the outer surface of the package casing 2 to achieve rapid bonding with the outer surface of the battery core 1.
  • the material of the sub-layer 32 of the adhesive layer 3 near the inner surface of the package can be selected from a thermosensitive adhesive having no initial tack at normal temperature.
  • the adhesive or reactive adhesive does not cause adhesion of the sub-layer 32 even when pressed during the sizing process, and is convenient for entering the shell.
  • the material of the sub-layer of the remaining adhesive layer 3 is not limited, and may preferably be selected from a pressure-sensitive adhesive having no initial tack at normal temperature, a heat-sensitive adhesive having no initial tack at normal temperature, and a reactive adhesive. One or more of the agents to enhance adhesion.
  • the pressure-sensitive adhesive having no initial tack at normal temperature may be selected from the group consisting of styrene-ethylene-butadiene-styrene blocks. Copolymer (SEBS).
  • SEBS styrene-ethylene-butadiene-styrene blocks. Copolymer
  • the heat-sensitive adhesive having no initial tack at normal temperature may be selected from the group consisting of styrene-isoprene-styrene block copolymer (SIS), polystyrene (PS) or polyisoprene (PI).
  • the reactive adhesive may be selected from epoxy resins.
  • an electrolyte additive may also be included in the adhesive layer 3.
  • the electrolyte additive may be selected from one or more of ethylene sulfate, propylene sulfate, biphenyl, ethylene carbonate, vinylene carbonate, fluoroethylene carbonate, propane sultone, and adiponitrile. Not only can the electrolyte be infiltrated, but also the electrolyte additive can be gradually released from the adhesive layer 3 into the electrolyte during the cycle to improve the electrochemical performance of the electrochemical energy storage device.
  • the surface area of the adhesive layer 3 facing the outer surface of the battery core 1 may not be larger than the surface area of the outer surface of the battery core 1, and the adhesive layer 3 faces the package casing 2
  • the surface area of the inner surface may be no greater than the surface area of the outer surface of the cell 1.
  • the thickness at the thickest position of the adhesive layer 3 may not be greater than the thickness difference between the thickest position and the thinnest position of the battery core 1 in order to utilize the glue.
  • the flow characteristics of the adhesive layer 3 enhance the appearance flatness of the electrochemical energy storage device.
  • the adhesive layer 3 may be disposed at any position between the battery cell 1 and the package can 2.
  • the adhesive layer 3 may be disposed at one or several positions in the length, width, height direction surface of the battery cell 1, the tab area, and the region of the separator beyond the positive and negative electrode sheets.
  • the thickness of the adhesive layer 3 may be from 2 ⁇ m to 100 ⁇ m.
  • the electrochemical energy storage device may be selected from one of a lithium ion secondary battery, a super capacitor, a fuel cell, and a solar cell.
  • the battery cell 1 may be a coiled type battery Core, laminated battery or stacked roll cells.
  • the battery cell 1 can also be a profiled cell.
  • the package casing 2 may be a flexible package or a hard package.
  • the package 2 may be selected from an aluminum plastic film, a steel plastic film, an aluminum alloy case or a magnesium alloy case.
  • the method for preparing an electrochemical energy storage device for preparing the electrochemical energy storage device of the first aspect of the invention, comprising the steps of: Step 1: separating the positive electrode sheet, the negative electrode sheet, and the positive electrode sheet and the negative electrode The separator between the sheets is made into the cell 1; Step 2: an adhesive layer 3 is disposed between the cell 1 and the package 2, the adhesive layer 3 is flow dynamic and the adhesive layer 3 and the package 2 The bonding force between the two is less than or equal to 0.1 N/mm; Step 3: loading the battery core 1 into the packaging shell 2, injecting the electrolyte and sealing, and then heating or pressurizing the outer surface of the packaging shell 2 to realize the adhesive layer 3 The curing is to securely connect the battery cell 1 and the package case 2.
  • the adhesive layer 3 can be adhered between the cell 1 and the package 2
  • the interface is rearranged, even if the adhesive layer 3 flows to a position where the overall thickness of the electrochemical energy storage device is small, so that the interface is flat, thereby increasing the energy density of the electrochemical energy storage device.
  • the adhesive layer 3 may be disposed on the outer surface or package of the battery cell 1 by coating or dispensing.
  • the coating method has a larger sizing area per unit time, and is advantageous for increasing the productivity of the battery core 1 having a larger surface area; the dispensing method is more flexible, and has no selectivity for the sizing position, and is particularly suitable for use in a shaped battery.
  • the multi-face junction or junction of the shaped cell can be stuck to solve the problem of edge lifting at the junction.
  • the temperature at which the adhesive layer 3 is disposed may be 10 ° C to 200 ° C, and the relative humidity (RH) may be 10 % ⁇ 80%.
  • the temperature at the time of heat curing may be 45 ° C to 90 ° C, and the pressure at the time of pressure curing may be 0.2 MPa to 2 MPa. .
  • LiCoO 2 , conductive carbon, and polyvinylidene fluoride were dispersed in N-methylpyrrolidone in a weight ratio of 95:1:4 to prepare a positive electrode slurry, which was then compacted into a positive electrode sheet having a thickness of 102 ⁇ m.
  • Graphite, conductive carbon, sodium carboxymethylcellulose, styrene-butadiene rubber were dispersed in deionized water at a weight ratio of 96:1:2:1 to prepare a negative electrode slurry, which was then compacted by coating to form a negative electrode having a thickness of 90 ⁇ m. sheet.
  • Ethylene carbonate (EC), propylene carbonate (PC), diethyl carbonate (DEC), and ethyl methyl carbonate (EMC) are formulated into a non-aqueous organic solvent at a weight ratio of 20:20:45:15, and then added to 1.5.
  • the preparation of the electrolyte is completed by mol/L of LiPF 6 as a lithium salt.
  • the prepared positive electrode sheet, PE separator, and negative electrode sheet were sequentially wound to prepare a wound cell having a thickness of 4.0 mm, a width of 52 mm, and a length of 60 mm.
  • An adhesive having a viscosity of nearly 100,000 mp.s prepared from a styrene-isoprene-styrene 1:1:1 block copolymer was coated on a roll at 25 ° C and an RH of 20%.
  • the thickness of the adhesive layer is 50 ⁇ m
  • the adhesion between the adhesive layer and the aluminum film of the package is 0.05 N/mm, after which The battery core is filled into the packaging shell, the electrolyte is poured and sealed, and then the outer surface of the packaging shell is heated to 75 ° C to cure the adhesive layer to fix the battery core and the packaging shell, and then formed into a gas and formed into a lithium. Preparation of an ion secondary battery.
  • a lithium ion secondary battery was prepared in accordance with the method of Example 1, except for the following:
  • the viscosity is 60,000 mp.s and the aluminum alloy is packaged with styrene-ethylene-butadiene-styrene 1:1:1:1 copolymer at 45 ° C and RH of 60%.
  • the adhesion between the films is less than 0.1 N / mm of adhesive is applied to the outer surface of the cell in the winding direction and the tail of the cell in the vertical winding direction, the thickness of the adhesive layer is 50 ⁇ m, and then the cell is loaded into the package
  • the electrolyte is filled and sealed, and then a surface pressure of 1 MPa is applied to the outer surface of the package to cure the adhesive layer to fix the battery core and the package, and then formed into a lithium ion secondary battery by chemical formation and evacuation molding. preparation.
  • a lithium ion secondary battery was prepared in accordance with the method of Example 1, except for the following:
  • the adhesive prepared by epoxy resin, viscosity 80,000 mp.s and the adhesion between the aluminum foil film and the packaging shell is less than 0.1N / mm Covering the two sides of the winding direction of the battery core, the thickness of the adhesive layer is 50 ⁇ m, then the battery core is placed in the packaging shell, the electrolyte is poured and sealed, and a surface pressure of 0.8 MPa is applied to the outer surface of the packaging shell to make the glue The adhesive layer is cured to fix the battery core and the package shell, and then is formed into a lithium ion secondary battery by chemical formation and evacuation molding.
  • a lithium ion secondary battery was prepared in accordance with the method of Example 1, except for the following:
  • the viscosity of the polypropylene is 50,000 at 200 ° C and RH 50%.
  • the adhesive of mp.s and the aluminum-plastic film of the package is less than 0.1N/mm, and the adhesive is applied to the surface of the battery in the winding direction and the head and tail of the vertical winding direction, and the adhesive is adhesive.
  • the thickness of the agent layer is 30 ⁇ m, after which the battery core is filled into the package shell, the electrolyte is poured and sealed, and the outer surface of the outer package is heated to 60 ° C and a surface pressure of 0.5 MPa is applied to cure the adhesive layer to laminate the battery and the package.
  • the shell is fixedly connected, and then subjected to chemical formation and evacuation molding to complete the preparation of the lithium ion secondary battery.
  • a lithium ion secondary battery was prepared in accordance with the method of Example 1, except for the following:
  • the viscosity is 60,000 mp.s, prepared from polystyrene at 180 ° C and 80% RH.
  • the adhesive agent having a bonding force of less than 0.1 N/mm with the aluminum foil of the package is coated on the upper and lower sides of the battery core perpendicular to the winding direction, and the thickness of the adhesive layer is 50 ⁇ m, and then the electricity is charged.
  • the core is filled into the package shell, the electrolyte is poured and sealed, and the outer surface of the outer package is heated to 75 ° C to cure the adhesive layer to fix the battery core and the package shell, and then formed into a lithium ion by chemical formation and evacuation molding. Preparation of secondary batteries.
  • a lithium ion secondary battery was prepared in accordance with the method of Example 1, except for the following:
  • the positive electrode sheet, the separator, and the negative electrode sheet were laminated in this order to prepare a laminated battery core having a thickness of 4.0 mm, a width of 52 mm, and a length of 60 mm.
  • the thickness of the adhesive layer is 50 ⁇ m, and then the laminated battery cell is placed in the packaging shell, the electrolyte is poured and sealed, and the outer surface of the outer packaging is heated to 75 ° C to make the adhesive.
  • the agent layer is cured to fix the cell and the package shell, and then formed into a lithium ion secondary battery by chemical formation and evacuation molding.
  • a lithium ion secondary battery was prepared in accordance with the method of Example 1, except for the following:
  • the positive electrode sheet, the separator, and the negative electrode sheet are sequentially wound to prepare a plurality of bare cells of different sizes, and then combined into a stepped shaped core.
  • the thickness of the adhesive layer is 50 ⁇ m.
  • the shaped cell is placed in the package, the electrolyte is poured and sealed, and the outer surface of the outer package is heated to 75 ° C to cure the adhesive layer.
  • the battery core and the package shell are fixedly connected, and then formed into a lithium ion secondary battery by chemical formation and evacuation molding.
  • a lithium ion secondary battery was prepared in accordance with the method of Example 1, except for the following:
  • the viscosity is 60,000 mp.s and the aluminum alloy is packaged with styrene-ethylene-butadiene-styrene 1:1:1:1 copolymer at 60 ° C and RH of 80%.
  • the adhesive having a bonding force between the films of less than 0.1 N/mm is applied to the outer surface of the wound cell other than the tab, the thickness of the adhesive layer is 50 ⁇ m, and the adhesive
  • the layer is further mixed with an electrolyte additive biphenyl having a mass percentage of 0.01% of the total mass of the adhesive layer, and then the wound cell is placed in the package, the electrolyte is poured and sealed, and then the outer surface of the package is applied.
  • a surface pressure of 1 MPa was applied to cure the adhesive layer to fix the cell and the package, and then formed into a lithium ion secondary battery by chemical formation and evacuation molding.
  • a lithium ion secondary battery was prepared in accordance with the method of Example 1, except for the following:
  • the wound cell At the winding end of the wound cell, it is directly fixed with a 5mm wide and 60mm long acrylic single-sided tape, then filled into the aluminum film of the package, filled with electrolyte and sealed, and then applied 1MPa to the outer surface of the package.
  • the surface pressure is used to fix the battery core and the package body, and then the formation and the extraction of the lithium ion secondary battery are completed.
  • a lithium ion secondary battery was prepared according to the method of Comparative Example 1, except for the following differences:
  • a lithium ion secondary battery was prepared in accordance with the method of Example 1, except for the following:
  • the surface of the wound cell is coated with the tape of the Chinese Patent Application Publication No. CN 102549801 A, and then the aluminum film of the package is filled, the electrolyte is poured and sealed, and a surface pressure of 1 MPa is applied to the outer surface of the package.
  • the battery core and the package shell are fixedly connected, and then formed into a gas and formed into a gas. Preparation of a lithium ion secondary battery.
  • a lithium ion secondary battery was prepared in accordance with the method of Example 7, except for the following:
  • the tape of the Chinese Patent Application Publication No. CN 102549801 A is bonded to the outer surface of the shaped core, and after the adhesive on the surface of the tape is dried, the aluminum plastic film of the package is filled, the electrolyte is poured and sealed, and then the package is sealed.
  • the outer surface of the outer surface is applied with a surface pressure of 1 MPa to fix the battery core and the package casing, and then formed into a lithium ion secondary battery by chemical formation and evacuation molding.
  • the main body of the lithium ion secondary battery is placed in a thickness tester, the tabs are exposed, and the thickness value of the main body of the lithium ion secondary battery is read and recorded, wherein the thickness of the lithium ion secondary battery main body is the thickness of the lithium ion secondary battery.
  • the thickness of the maximum position ie, the coincident area of the tab and the cell).
  • the lithium ion secondary battery was placed in a flatness meter (Shanghai Zhuo Li Li Tian Instrument Equipment Co., Ltd.) to test the flatness of the surface of the lithium ion secondary battery.
  • the package of the lithium ion secondary battery was disassembled, and the interface between the package and the cell was observed to have a poor interface due to wrinkling of the adhesive layer or wrinkling of the outer surface of the cell.
  • the lithium ion secondary battery is fixed in the drop test fixture with double-sided tape, and the six faces of the jig are sequentially numbered 1, 2, 3, 4, 5, and 6, and the four corners of the jig are sequentially numbered C1, C2, and C3. , C4.
  • the fixture was placed on a 1.5 m high test bench, and the lithium ion secondary batteries were sequentially dropped in the order of number 1-6, and then the lithium ion secondary batteries were sequentially dropped in the order of number C1-C4, and the cycle was repeated. 6 times, complete the drop test, after standing for 1h,
  • the pass rate of the lithium ion secondary battery drop test is calculated, and each group is tested with 10 lithium ion secondary batteries.
  • the lithium ion secondary battery was placed in an incubator at 25 ° C, and charged at a constant current of 0.5 C.
  • the cut-off voltage was 4.35 V, and then charged at a constant voltage of 4.35 V.
  • the off current was 0.025 C, and after standing for 3 min, 0.5. C constant current discharge, the cut-off voltage is 3.0V, this is a charge-discharge cycle process, repeating the above charging and discharging process 800 times, recording the initial thickness of the lithium ion secondary battery and the thickness after the cycle, and judging whether the lithium ion secondary battery is deformed
  • Each group was tested with 10 lithium ion secondary batteries.
  • Table 1 gives the performance test results of Examples 1-8 and Comparative Examples 1-4.
  • NA indicates that it is impossible to determine that the shaped cells were used in Example 7 and Comparative Example 4, and thus it was impossible to judge the appearance flatness.
  • the lithium ion secondary battery of the present invention can improve the drop test result without increasing the thickness of the battery, and the adhesive layer can prevent the deformation of the battery, the bonding interface is good, and the appearance of the battery is flat after long-term circulation.
  • the special-shaped battery is used, and the adhesive layer is disposed on the surface of the battery by means of dispensing, which not only facilitates the sizing of the shaped position, but also the fluidity of the adhesive layer can be used for the multi-face junction or junction of the shaped battery. Sticking and also re-bonding the bonding interface makes the bonding interface of the battery good, the surface of the battery is flat and the edge of the junction is not warped.
  • Example 8 It can be seen from Example 8 that a small amount of biphenyl is mixed in the adhesive.
  • the initial battery has better cycle performance, less demand for biphenyl, and the adhesive is used as the battery is used.
  • the biphenyl in the layer will gradually be released into the electrolyte, which can prevent the battery from over-decomposing lithium and the like, improve the cycle life of the battery, and avoid the problem of liquid rising caused by adding a large amount of electrolyte.
  • Comparative Example 1 and Comparative Example 2 respectively used single-sided adhesive tape and double-sided adhesive tape, which not only caused the bonding strength to decrease due to uneven bonding, but also the adhesive tape would tear the surface of the battery during the falling process, resulting in bonding in subsequent dropping. Invalid.
  • the tapes used in Comparative Example 3 and Comparative Example 4 also failed to improve the problem of wrinkling of the bonding interface and tearing of the surface of the core. Especially in Comparative Example 4, the tape used could not stick the multi-face junction or the junction of the shaped cell, resulting in the edge of the multi-face junction of the cell being warped.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Secondary Cells (AREA)

Abstract

L'invention concerne un dispositif accumulateur d'énergie électrochimique et un procédé de préparation du dispositif accumulateur d'énergie électrochimique. Le dispositif accumulateur d'énergie électrochimique comprend une pile, un électrolyte et une coque de conditionnement. Le dispositif accumulateur d'énergie électrochimique comprend en outre une couche adhésive. La couche adhésive est située entre la pile et la coque de conditionnement, et raccorde de manière fixe la pile à la coque de conditionnement. La couche adhésive se trouve dans un état d'écoulement avant traitement thermique et l'adhésion à la coque de conditionnement est inférieure ou égale à 0,1 N/mm, et la pile et la coque de conditionnement sont raccordées de manière fixe après le traitement thermique de la couche adhésive. Le dispositif accumulateur d'énergie électrochimique peut améliorer le problème de sécurité causé par les mauvais traitements sans influencer ses propriétés.
PCT/CN2015/084099 2015-07-15 2015-07-15 Dispositif accumulateur d'énergie électrochimique et procédé de préparation de dispositif accumulateur d'énergie électrochimique WO2017008269A1 (fr)

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