WO2011159106A2 - Accumulateur du type en sachet et son procédé de fabrication - Google Patents

Accumulateur du type en sachet et son procédé de fabrication Download PDF

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Publication number
WO2011159106A2
WO2011159106A2 PCT/KR2011/004405 KR2011004405W WO2011159106A2 WO 2011159106 A2 WO2011159106 A2 WO 2011159106A2 KR 2011004405 W KR2011004405 W KR 2011004405W WO 2011159106 A2 WO2011159106 A2 WO 2011159106A2
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WO
WIPO (PCT)
Prior art keywords
pouch
protrusion
type battery
electrode
copolymer
Prior art date
Application number
PCT/KR2011/004405
Other languages
English (en)
Korean (ko)
Other versions
WO2011159106A3 (fr
Inventor
김지수
이재훈
이헌영
조명훈
Original Assignee
주식회사 이아이지
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 주식회사 이아이지 filed Critical 주식회사 이아이지
Publication of WO2011159106A2 publication Critical patent/WO2011159106A2/fr
Publication of WO2011159106A3 publication Critical patent/WO2011159106A3/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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0436—Small-sized flat cells or batteries for portable equipment
    • 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

Definitions

  • the present invention relates to a pouch type battery having improved durability and a method of manufacturing the same.
  • Secondary batteries are used as power sources for various portable electronic devices. Secondary batteries can be manufactured in cans, squares, pouches, etc. Among them, pouch-type batteries can be manufactured in various forms compared to conventional cans or squares, and are lighter, making them more suitable for portable electronic devices. .
  • the pouch type battery includes an electrode assembly including a negative electrode, a positive electrode, and a separator, and a pouch case surrounding the outside.
  • a pouch-type battery has two pouch-type cases disposed above and below an electrode assembly to heat-seat and seal hem of opposite sides and opposite ends of an electrode lead.
  • an electrode assembly to heat-seat and seal hem of opposite sides and opposite ends of an electrode lead.
  • the electrode leads are formed in only one direction to reduce the possibility of moisture penetration, and one pouch-type case is folded in half and placed up and down to heat-bond both sides, and the other end of the electrode lead is heat-sealed.
  • methods for minimizing the penetration path of water have been developed.
  • one pouch-type case is used in this way, the airtightness of the bottom portion is improved, but the bottom portion is formed thinner than the case where the pouch-type case is thermo-compressed using two pouch-type cases by repeated thermal pressing.
  • the bottom portion of the pouch case loses the function of the heat-sealed resin coated on the pouch by repeated thermocompression bonding of the heat-sealing layer in the upper and lower layers of the pouch case, thereby reducing the effect of improving mechanical strength caused by the heat-sealing. Therefore, there is a problem that the durability of the battery against wear and external impact is weakened, and the possibility of water penetration due to the loss of the function of the heat-sealed resin is increased rather than using two pouches.
  • an object of the present invention is to provide a pouch-type battery and a method of manufacturing the same, which can solve the above problems and at the same time prevent performance degradation of the battery due to moisture infiltration.
  • the pouch battery according to the present invention is a pouch-type battery comprising an electrode assembly and a pouch case surrounding and sealing the outside of the electrode assembly, wherein the pouch case is formed by folding one pouch, which is the opposite side of the electrode lead of the electrode assembly.
  • the bottom is formed to form a protrusion formed by folding so as to protrude in the opposite direction of the electrode, and includes a fusion auxiliary film made of a heat sealable resin inside the protrusion.
  • the protruding portion is formed to protrude convexly so that the middle portion of the bottom opposite to the electrode lead of the pouch case is opposed to the electrode, or the edge portion of the bottom opposite to the electrode lead of the pouch case. It is characterized in that the convexly formed so as to protrude in the opposite direction to the electrode.
  • the protruding portion has a length of 3 to 28 mm.
  • the heat sealable resin constituting the fusion auxiliary film is polyethylene, polypropylene, polyolefin homopolymer, propylene-ethylene copolymer, propylene- ⁇ -olefin copolymer, ethylene- ⁇ -olefin air Copolymer, propylene-ethylene- ⁇ -olefin copolymer, polyolefin copolymer, ethylene-vinyl acetate copolymer (EVA), ethyleneethylacrylate copolymer (EEA), ethylene-methylacrylate copolymer (EMA), ethylene-green It consists of a material selected from the group consisting of a resin having a modified polyolefin (X is a substituent containing H or CH 3 ) having a repeating unit of the (dimethyl methacrylate copolymer (EGMA) and-(CH 2 -CHX)-.
  • X is a substituent containing H or CH 3
  • the length of the protrusion direction of the fusion aid film is 2 to 27 mm, and the length of the width of the fusion aid film is (pouch width-5 mm) to (pouch width-1 mm). It is characterized by.
  • the method of manufacturing a pouch-type battery comprises the steps of: i) cutting and bending the pouch case to form protrusions to form protrusions of the pouch case; ii) inserting a fusion auxiliary film made of a heat sealable resin into the protrusions and heat-sealing the protrusions; iii) placing an electrode assembly on one surface of the pouch case in which the lower protrusion is fused; And iv) heat-sealing the front portion of the pouch case surrounding the electrode assembly; Is done.
  • the present invention by folding the hem of the pouch case to form a protrusion, it is easy to fix the battery and excellent workability, by inserting a fusion auxiliary film inside the protrusion to fusion, thereby minimizing the moisture penetration path to reduce battery performance While preventing, there is an effect to improve the durability of the battery.
  • FIG. 1 to 6 schematically show one embodiment of the pouch-type battery according to the present invention.
  • Pouch-type battery according to the present invention is made of an electrode assembly 10, as shown in Figure 1, and a pouch case 20 for wrapping and sealing the outside of the electrode assembly, the pouch case is made of one pouch
  • the lower end opposite to the electrode lead 11 forms a protrusion 21 formed by folding so as to protrude in the opposite electrode direction, and includes a fusion auxiliary film 30 made of a heat sealable resin inside the protrusion.
  • the electrode assembly 10 includes a cathode coated with a cathode active material, a cathode coated with an anode active material, and a separator positioned between the anode and the cathode to prevent shorting and to allow only ions to move.
  • the positive electrode is polyethylene, polypropylene, chlorinated polyethylene, polybutylene, chlorinated polypropylene, polyethylene derivatives, polyvinylidene fluoride, polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose At least one selected from the group consisting of rose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene butylene rubber, and fluorine rubber
  • a binder, a binder, a conductive agent, and the like are dispersed in a solvent together with a positive electrode active material to prepare a slurry, and then coated on a positive electrode current collector, dried, and pressed.
  • a slurry prepared by dispersing a binder, a conductive agent, a binder, and the like in a solvent together with a negative electrode active material is applied to the negative electrode current collector, dried, and pressed in the same manner as in the preparation of the positive electrode.
  • the slurry may optionally further include other components such as viscosity regulators, fillers, crosslinking accelerators, coupling agents, adhesion promoters, and the like.
  • the cathode active material a composite metal oxide including LiCoO 2 , LiMn 2 O 4 , LiNiO 2 , LiNi 1-X Co X O 2 (0 ⁇ x ⁇ 1), LiMnO 2 to these components may be used.
  • a foil made of aluminum, nickel, or a combination thereof may be used.
  • the negative electrode active material may be Si, Sn, tin oxide, tin alloy composites (composite tin alloys), transition metal compounds, lithium metal nitride, lithium metal oxide, carbon-based materials, etc., the negative electrode active material used in the present invention This is not limited to this.
  • a foil made of copper, gold, nickel or a copper alloy or a combination thereof can be used as the negative electrode current collector used for the negative electrode.
  • the conductive agent is not particularly limited as long as it has conductivity without causing chemical change of the battery.
  • graphite such as natural graphite or artificial graphite and its fine powder, carbon black, acetylene black, ketjen black, channel black Carbon blacks such as furnace black, lamp black and summer black;
  • Conductive fibers such as carbon fibers and metal fibers, metal powders such as carbon fluoride, aluminum and nickel powders, conductive whiskeys such as zinc oxide and potassium titanate, conductive metal oxides such as titanium oxide and conductive materials such as polyphenylene derivatives, etc. This can be used.
  • the separator that can be used in the present invention is a multi-layered film made by polyethylene (polyethylene), polypropylene (polypropylene), or a combination of these films having a microporous structure, or polyvinylidene fluoride (polyvinylidene fluoride) And polymer films for solid polymer electrolytes or gel polymer electrolytes such as polyethylene oxide, polyacrylonitrile, or polyvinylidene fluoride hexafluoropropylene copolymers.
  • a pouch case 20 for accommodating the electrode assembly is prepared.
  • the pouch case is in the form of a laminate sheet in which a metal layer, a heat seal layer is formed on one surface of the metal layer, and an insulating film is formed on the other surface thereof, and a predetermined internal space for accommodating the electrode assembly 10 is provided.
  • the heat seal layer may be modified polypropylene such as C-PP (Casted Polypropylene), and the insulating layer may be formed of a resin material such as nylon or polyethylene terephthalate (PET), but is not limited thereto.
  • C-PP Cold Polypropylene
  • PET polyethylene terephthalate
  • the electrode assembly is connected to the electrode is exposed to the outside, the electrode exposed to the outside, and part of the pouch case to be open for accommodating the electrode assembly, and after the assembly should be able to seal.
  • the surface of the pouch case facing each other to surround the electrode assembly is a heat seal layer, and sealing is completed by heat welding.
  • the pouch-type battery according to the present invention provides a protrusion 21 as well as a predetermined internal space for accommodating the electrode assembly.
  • the protrusion is a middle portion of the bottom opposite to the electrode of the pouch case as shown in FIG. 2.
  • the part may be folded to protrude in an opposite direction to the electrode and formed convexly.
  • Another embodiment of the pouch battery according to the present invention may have a shape as shown in FIG. 3 so as to protrude convexly so that the edge of the bottom of the pouch case protrudes in the opposite direction to the electrode.
  • Position of the protrusions in the present invention is not limited to the embodiment shown in Figures 2 and 3, as can be seen in Figures 1 and 4 to 6, the projections according to the use of the pouch-type battery according to the present invention is used The position of and the portion exposing the electrode lead may be positioned differently.
  • the length of the protruding portion in the direction opposite to the electrode lead is preferably 3 to 28 mm. If the length of the protrusion in the opposite direction to the electrode lead is less than 3mm, it is difficult to obtain the effect of improving durability, even if it exceeds 28mm, the effect is not greater than 28mm or less.
  • the heat sealable resin of the fusion auxiliary film 30 is not particularly limited as long as it is made of a material having heat fusion.
  • the thermocompression bonding is performed at a temperature near or above the melting point of the heat-sealing resin constituting the pouch case, the heat-sealing layer of the pouch case is fused, and in addition to the heat-sealing layer of the pouch case, the fusion is further inserted into the protrusions.
  • the thermal compression is more effective than the case in which the auxiliary film is not provided with the fusion auxiliary film. As a result, the mechanical strength of the protrusion is improved, which helps to improve the durability of the battery.
  • the heat sealable resin of the fusion auxiliary film 30 may be the same as or different from the material constituting the heat sealable resin constituting the pouch case, specifically, polyethylene, polypropylene, polyolefin homopolymer, propylene-ethylene copolymer , Propylene- ⁇ -olefin copolymer, ethylene- ⁇ -olefin copolymer, propylene-ethylene- ⁇ -olefin copolymer, polyolefin copolymer, ethylene-vinyl acetate copolymer (EVA), ethyleneethyl acrylate copolymer (EEA) Modified polyolefins having repeating units of ethylene-methylacrylate copolymer (EMA), ethylene-glycidimethacrylate copolymer (EGMA) and-(CH 2 -CHX)-(X comprises H or CH 3) It may be made of a material selected from the group consisting of a resin having a substituent).
  • EMA ethylene-methylacrylate
  • the length of the electrode assembly direction of the fusion aid film 30 of the heat-sealing resin is 2 to 27 mm
  • the length of the width of the fusion aid film is (pouch width-5 mm) to (pouch width-1 mm) is preferred to ensure efficient heat sealability and fairness.
  • the manufacturing method of the pouch type battery by this invention is as follows.
  • a heat fusion auxiliary film made of a heat sealable resin is inserted into the protrusion and thermally fused. Thereafter, the electrode assembly is positioned on one surface of the pouch case in which the heat fusion layer is formed, and the front surface of the pouch case surrounding the electrode assembly is subjected to heat fusion.
  • the lower end portion is bent to form a protrusion, and then heat fusion is performed by inserting a fusion auxiliary film made of a heat sealable resin prepared in advance into the formed protrusion.
  • the electrode assembly is positioned in the pouch case in which the protrusion is formed, and the pouch case is folded while surrounding the electrode assembly.
  • the pouch case is folded while surrounding the electrode assembly so that the bottom end, which is opposite to the electrode lead of the electrode assembly of the folded pouch case, protrudes in the opposite electrode direction to form a protrusion.
  • the electrode assembly is placed in contact with the surface on which the heat seal layer of the pouch case is formed.
  • the front surface of the pouch case in which the electrode assembly is placed therein is heat-sealed so as to be completely sealed.
  • one pouch case is inserted into the folded protrusion as shown in FIG. 1, and then the heat-adhesive fusion auxiliary film made of a heat-adhesive resin is thermally compressed and the electrode portion is positioned as an open portion of the pouch.
  • the electrode assembly is inserted to thermo-compress the slope of the pouch, not only the mechanical strength of the protrusion is improved, but also the durability of the protrusion is maximized.
  • the present invention by folding the hem of the pouch case to form a protrusion, it is easy to fix the battery and excellent workability, by inserting a fusion auxiliary film inside the protrusion to fusion, thereby minimizing the moisture penetration path to reduce battery performance While preventing, there is an effect to improve the durability of the battery.

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

Abstract

La présente invention concerne un accumulateur du type en sachet qui offre une durabilité améliorée, ainsi que son procédé de fabrication, comprenant les étapes suivantes : former une partie en saillie par repli d'une feuille d'une enveloppe poche ; presser à chaud la partie en saillie après insertion, à l'intérieur de la partie en saillie, d'un film auxiliaire fondant à chaud, formé d'une résine fondant à chaud ; et insérer un ensemble électrode afin de placer une partie d'électrode dans une partie ouverte du sachet et presser à chaud les quatre côtés du sachet. La présente invention améliore la résistance mécanique et rend donc maximale la durabilité de la partie en saillie.
PCT/KR2011/004405 2010-06-16 2011-06-16 Accumulateur du type en sachet et son procédé de fabrication WO2011159106A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2010-0057019 2010-06-16
KR1020100057019 2010-06-16

Publications (2)

Publication Number Publication Date
WO2011159106A2 true WO2011159106A2 (fr) 2011-12-22
WO2011159106A3 WO2011159106A3 (fr) 2012-05-03

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113574720A (zh) * 2019-03-29 2021-10-29 株式会社Lg新能源 二次电池的电池壳体和袋型二次电池

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060097445A (ko) * 2005-03-09 2006-09-14 주식회사 엘지화학 저융점 접착성 수지에 의해 안전성이 향상된 이차전지
KR20080099890A (ko) * 2007-05-11 2008-11-14 주식회사 엘지화학 바이폴라 셀을 포함하는 이차전지
KR20090076281A (ko) * 2008-01-08 2009-07-13 주식회사 엘지화학 파우치형 전지

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060097445A (ko) * 2005-03-09 2006-09-14 주식회사 엘지화학 저융점 접착성 수지에 의해 안전성이 향상된 이차전지
KR20080099890A (ko) * 2007-05-11 2008-11-14 주식회사 엘지화학 바이폴라 셀을 포함하는 이차전지
KR20090076281A (ko) * 2008-01-08 2009-07-13 주식회사 엘지화학 파우치형 전지

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113574720A (zh) * 2019-03-29 2021-10-29 株式会社Lg新能源 二次电池的电池壳体和袋型二次电池
CN113574720B (zh) * 2019-03-29 2023-08-15 株式会社Lg新能源 二次电池的电池壳体和袋型二次电池

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WO2011159106A3 (fr) 2012-05-03

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