WO2020133555A1 - Pile rechargeable au lithium-ion en sachet souple du type bouton et son procédé de traitement - Google Patents

Pile rechargeable au lithium-ion en sachet souple du type bouton et son procédé de traitement Download PDF

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Publication number
WO2020133555A1
WO2020133555A1 PCT/CN2019/000252 CN2019000252W WO2020133555A1 WO 2020133555 A1 WO2020133555 A1 WO 2020133555A1 CN 2019000252 W CN2019000252 W CN 2019000252W WO 2020133555 A1 WO2020133555 A1 WO 2020133555A1
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WIPO (PCT)
Prior art keywords
pole piece
positive electrode
electrode plate
negative electrode
positive
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PCT/CN2019/000252
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English (en)
Chinese (zh)
Inventor
卢灿生
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东莞市美尼电池有限公司
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Publication of WO2020133555A1 publication Critical patent/WO2020133555A1/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
    • H01M10/058—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
    • 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
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the invention relates to the field of batteries, in particular to a rechargeable button-type soft-pack lithium ion battery and a processing method.
  • the existing button batteries include 1.5V primary alkaline manganese, zinc manganese and 3V lithium primary batteries, and 3.6V steel shell lithium ion batteries.
  • the traditional button-type lithium battery is made of metal, which will explode and catch fire, has poor safety, and is relatively heavy. It is not suitable for Bluetooth headsets and other areas that require high weight and safety. The production efficiency of traditional button lithium batteries is low.
  • the 18650 is large in size and heavy in weight. It is a rigid shell structure, mechanically encapsulated, and uses a pressure relief valve as an overpressure release channel.
  • the rechargeable button lithium batteries on the market are all metal shells and mechanically encapsulated.
  • the winding core is generally a lamination type or a bag-filling type, and the process is cumbersome and cannot be automated.
  • the soft-pack lithium ion batteries widely used in digital products such as mobile phones are all of a square structure, and the positive and negative current collectors are directly led out from the same side of the core, which is not suitable for making button soft-pack lithium ion batteries.
  • the traditional soft-packed cylindrical battery requires two aluminum-plastic film airbags and is packaged twice. After the package, the lead angle needs to be bent to match the electronic product. The production efficiency is low, the bending risk is high, and the battery is easily damaged.
  • the present invention aims to provide a rechargeable button-type soft-pack lithium ion battery with good safety performance, light weight, and higher production efficiency, and a processing method.
  • the solution of the present invention is: a rechargeable button-type soft-pack lithium ion battery, including a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte;
  • the mass percentage of the positive electrode sheet composition is: 97.5-98.0% lithium cobaltate, 0.8-1.0% PVDF, 1.0% conductive agent, 1.0% carbon nanotubes;
  • the mass percentage of the negative electrode composition is: 92-93.0% graphite, 1.5% conductive agent, 2% graphene, 2% silicon carbon, 1.5% LAR, 0.5% CMC,
  • the isolation film is a ceramic layer structure with a thickness of 3-4 microns formed on the surface of the dry process diaphragm;
  • the mass percentage of the electrolyte composition is: 12-13% LiPF 6 , 75-86% solvent, 2-5% additive.
  • the lithium cobalt oxide D50 of the positive electrode sheet is 8-14um; the specific surface area is 0.2-0.5m 2 /g; the tap density is greater than or equal to 2.5g/cm 3 ; the gram capacity is greater than or equal to 145mAh/g;
  • the D50 of graphite in the negative electrode sheet is 12-20um; the specific surface area is 1.0-1.6m 2 /g; the tap density is greater than or equal to 1.0-1.3g/cm 3 ; the gram capacity is greater than or equal to 340mAh/g;
  • the porosity of the isolation membrane is 40-50%;
  • the conductivity of the electrolyte was 7.0-9.0mS / cm; density of 1.15-1.3g / cm 3; a moisture content of less than or equal 20PPM.
  • the area density of the positive pole piece is 30-40 mg/cm 2 and the compaction density is 3.7-4.15 g/m 3 ;
  • the area density of the negative pole piece is 14.0-20.0 mg/cm 2 and the compaction density is 1.4-1.6g/m 3 ;
  • the solvent includes EC, EMC, DEC, FEC, LiBOB, and the mass percentage of the solvent contained in the electrolyte is 30-40% EC, 5-15% EMC, 40-48.5% DEC, 1% FEC, 0.5% LiBOB.
  • the additives include VC, PS, DTD, FEC, LiBOB, and the mass percentage of the additives contained in the electrolyte is 1.0-1.5% VC, 2-3% PS, 0.5% DTD, 1% FEC, 0.5% LiBOB.
  • a rechargeable button-type soft-pack lithium-ion battery structure includes a casing, the casing is a cylindrical aluminum-plastic composite membrane structure, and a positive pole piece, a separator and a negative pole piece are arranged in the casing, and the separator is located at the positive electrode Between the pole piece and the negative pole piece, the positive pole piece, the separator and the negative pole piece are rolled into a cylindrical winding core structure and placed in the casing;
  • Electrolyte is also filled between the positive pole piece and the negative pole piece;
  • the positive pole piece is also electrically connected to the positive pole tab, and the negative pole piece is also electrically connected to the negative pole tab.
  • the first step is to shape and punch the aluminum-plastic composite film through the mold to form a concave shell
  • the second step is to assemble, roll the positive pole piece, separator and negative pole piece into a cylindrical winding core structure and put it into the casing, where the separator is located between the positive pole piece and the negative pole piece, and then inject the positive pole piece and the negative pole piece Inject electrolyte between the sheets;
  • the third step is installation, ultrasonic welding of the positive electrode lugs on the positive pole pieces, and resistance welding of the negative pole lugs on the negative pole pieces;
  • the fourth step is encapsulation, and the assembled shell is sealed by a thermoplastic packaging process.
  • the sealing conditions are: temperature 180-190°C, pressure 0.25-0.4Mpa.
  • the beneficial effect of the present invention is that this application uses an aluminum-plastic structure as the casing, which is more convenient to process and lighter in weight. After assembly, it can also be sealed by a thermoplastic packaging process, which has high installation efficiency and good safety sealing performance; The sheets, separators and negative pole pieces are rolled into a cylindrical winding core structure, and the production and processing efficiency is higher.
  • the positive electrode and the negative electrode of the present application are led out from both sides for convenient use; the present application adopts an aluminum-plastic film casing, which is packaged at one time, and no lead angle is required after the package, without bending, and the production efficiency is low, safe and stable.
  • FIG. 1 is a schematic structural diagram of the present invention.
  • a specific embodiment of the present invention is a rechargeable button-type soft-pack lithium ion battery, including a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte;
  • the mass percentage of the positive electrode sheet composition is: 97.5-98.0% lithium cobaltate, 0.8-1.0% PVDF, 1.0% conductive agent, 1.0% carbon nanotubes; after adding carbon nanotubes, good thermal conductivity is good for battery charging and discharging The heat dissipation at the time reduces the polarization of the battery, improves the high and low temperature performance of the battery, and extends the life of the battery.
  • the mass percentage of the negative electrode sheet composition is: 92-93.0% graphite, 1.5% conductive agent, 2% graphene, 2% silicon carbon, 1.5% LAR (binder), 0.5% CMC.
  • LAR is a binder, and it can be cycled at high and low temperatures after being added. It can be used for low-temperature 0° charging cycles in low-temperature systems without affecting its use.
  • silicon carbon has a high capacity and improves energy density, which is very significant for the performance improvement of small button-type soft-pack batteries.
  • the isolation film is a ceramic layer structure with a thickness of 3-4 microns formed on the surface of the dry process diaphragm;
  • the mass percentage of the electrolyte composition is: 12-13% LiPF6, 75-86% solvent, 2-5% additive.
  • the D50 of the lithium cobaltate in the positive electrode sheet is 8-14um; the specific surface area is 0.2-0.5m 2 /g; the tap density is greater than or equal to 2.5g/cm 3 ; the gram capacity is greater than or equal to 145mAh/g;
  • the D50 of graphite in the negative electrode sheet is 12-20um; the specific surface area is 1.0-1.6m 2 /g; the tap density is greater than or equal to 1.0-1.3g/cm 3 ; the gram capacity is greater than or equal to 340mAh/g;
  • the porosity of the isolation membrane is 40-50%;
  • the conductivity of the electrolyte was 7.0-9.0mS / cm; density of 1.15-1.3g / cm 3; a moisture content of less than or equal 20PPM.
  • the area density of the positive pole piece is 30-40 mg/cm 2 , and the compaction density is 3.7-4.15 g/m 3 ; the area density of the negative pole piece is 14.0-20.0 mg/cm 2 , and the compaction density is 1.4-1.6 g/m 3 ;
  • the solvent includes EC, EMC, DEC, FEC, LiBOB, and the mass percentage of the solvent contained in the electrolyte is 30-40% EC, 5-15% EMC, 40-48.5% DEC, 1% FEC, 0.5 %LiBOB.
  • the additives include VC, PS, DTD, FEC, LiBOB, and the mass percentage of the additives contained in the electrolyte is 1.0-1.5% VC, 2-3% PS, 0.5% DTD, 1% FEC, 0.5% LiBOB .
  • solvents and additives are as follows: EC (Ethylene Carbonate), EMC (Ethyl Carbonate-Ethyl Carbonate), DEC (Diethyl Carbonate-Diethyl Carbonate), FEC (Fluorinated Ethylene Carbonate 4- Fluoro-1,3-dioxolan-2-one), LiBOB (Lithium bisoxalate borate Lithium bis (oxalato) borate), VC (Vinylene carbonate), PS (1,3-propane sultone 1, 3-Propane sultone), DTD (vinyl sulfate 1,2-Ethylene sulfate); PVDF: polyvinylidene fluoride, CMC: sodium carboxymethyl cellulose.
  • a rechargeable button-type soft-pack lithium-ion battery structure includes a housing 1, the housing 1 is a cylindrical aluminum-plastic composite film structure, the housing 1 is provided with a positive pole piece 2, a separator 3 and a negative pole piece 4 The separator 3 is located between the positive pole piece 2 and the negative pole piece 4, and the positive pole piece 2, the separator 3 and the negative pole piece 4 are rolled into a cylindrical winding core structure and placed in the casing 1;
  • An electrolyte is also filled between the positive pole piece 2 and the negative pole piece 4;
  • the positive pole piece 2 is also electrically connected to the positive pole tab 5
  • the negative pole piece 4 is also electrically connected to the negative pole tab 6.
  • the positive and negative ears of the present application detect that the positive and negative ears are opposite to each other at the tail of the winding core, which is different from the traditional battery.
  • a method for processing a rechargeable button-type soft pack lithium ion battery the specific steps are as follows:
  • the first step is molding, at room temperature, stamping on the aluminum-plastic composite film by a mold to form a concave shell;
  • the second step is to assemble, roll the positive pole piece, separator and negative pole piece into a cylindrical winding core structure and put it into the casing, where the separator is located between the positive pole piece and the negative pole piece, and then inject the positive pole piece and the negative pole piece Inject electrolyte between tablets;
  • the third step is installation, ultrasonic welding of the positive electrode lugs on the positive pole pieces, and resistance welding of the negative pole lugs on the negative pole pieces;
  • the fourth step is encapsulation, and the assembled shell is sealed by a thermoplastic packaging process.
  • the packaging conditions are: temperature 180-190°C, pressure 0.25-0.4Mpa, and heat fusion for 3 seconds.
  • the processing technology of the laminated soft battery is cumbersome, not automatic, and has low efficiency.
  • the traditional 18650 is large in size and heavy in weight, it is a rigid shell structure, mechanically encapsulated, and uses a pressure relief valve as an overpressure relief channel, which is not suitable for small equipment.
  • the rechargeable button soft pack lithium battery of this application is small in size, light in weight, stamped airbag, and thermoplastic packaging. It uses the extensibility of aluminum-plastic film material and a special airbag space design to absorb the pressure caused by slight abnormalities inside and outside. When the accident expands and the internal pressure exceeds the normal range, the internal pressure can escape from the positive and negative heat seals to ensure that the battery will not explode and catch fire.
  • This application uses an aluminum-plastic structure as the housing, which is more convenient to process and lighter in weight. After assembly, it can also be sealed by a thermoplastic packaging process, which has high installation efficiency and good sealing performance.
  • the positive pole piece, diaphragm and negative pole are used.
  • the sheet is rolled into a cylindrical winding core structure, and the production and processing efficiency is higher; the positive and negative electrodes of this application are drawn from both sides for ease of use;
  • this application uses an aluminum-plastic film casing, which is packaged at one time, and there is no guide angle and no bending after packaging. Low efficiency, safe and stable.

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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)
  • Secondary Cells (AREA)

Abstract

L'invention concerne une pile rechargeable au lithium-ion en sachet souple du type bouton, comprenant une enveloppe (1) qui est une structure de film composite aluminium-plastique cylindrique. Une plaque d'électrode positive (2), une membrane (3) et une plaque d'électrode négative (4) sont disposées dans l'enveloppe (1) ; la membrane (3) étant située entre la plaque d'électrode positive (2) et la plaque d'électrode négative (4), et la plaque d'électrode positive (2), la membrane (3) et la plaque d'électrode négative (4) étant enroulées en une structure de cœur en bobine cylindrique et placées à l'intérieur de l'enveloppe (1). En outre, l'espace entre la plaque d'électrode positive (2) et la plaque d'électrode négative (4) est rempli d'électrolyte. La plaque d'électrode positive (2) est en outre connectée électriquement à une languette d'électrode positive (5), et la plaque d'électrode négative (4) est en outre connectée électriquement à une languette d'électrode négative (4). L'invention concerne également un procédé de traitement pour la pile, comprenant les étapes de moulage, d'assemblage, d'installation et d'emballage. La pile adopte une structure aluminium-plastique comme enveloppe (1), assurant un traitement plus pratique et un poids plus léger ; la pile est étanchéifiée au moyen d'un processus d'emballage thermoplastique après assemblage, assurant une haute efficacité d'installation et de bonnes performances de sécurité et d'étanchéité ; la plaque d'électrode positive (2), la membrane (3) et la plaque d'électrode négative (4) sont enroulées en la structure de cœur en bobine cylindrique, assurant un plus haut rendement de production et de traitement.
PCT/CN2019/000252 2018-12-28 2019-12-20 Pile rechargeable au lithium-ion en sachet souple du type bouton et son procédé de traitement WO2020133555A1 (fr)

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CN201811617660.9A CN109768337A (zh) 2018-12-28 2018-12-28 一种可充电纽扣式软包锂离子电池及加工方法
CN201811617660.9 2018-12-28

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Cited By (1)

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CN113393463A (zh) * 2021-08-18 2021-09-14 苏州高视半导体技术有限公司 软包电池卷芯检测入壳方法

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CN109768337A (zh) * 2018-12-28 2019-05-17 东莞市美尼电池有限公司 一种可充电纽扣式软包锂离子电池及加工方法
CN110783615B (zh) * 2019-08-06 2023-05-02 松栢投资有限公司 软包扣式锂电池的制造方法以及软包扣式锂电池
CN112349948A (zh) * 2020-11-12 2021-02-09 大器(深圳)创新科技有限公司 一种新型圆柱纽扣电池
CN114628764B (zh) * 2022-03-15 2022-10-21 贵州大学 一种微型无极耳软包电池制备方法及在柔性设备中的应用

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