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WO2019203450A1 - Batterie secondaire - Google Patents

Batterie secondaire Download PDF

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Publication number
WO2019203450A1
WO2019203450A1 PCT/KR2019/003015 KR2019003015W WO2019203450A1 WO 2019203450 A1 WO2019203450 A1 WO 2019203450A1 KR 2019003015 W KR2019003015 W KR 2019003015W WO 2019203450 A1 WO2019203450 A1 WO 2019203450A1
Authority
WO
WIPO (PCT)
Prior art keywords
hole
sealing
injection
secondary battery
injection hole
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.)
Ceased
Application number
PCT/KR2019/003015
Other languages
English (en)
Korean (ko)
Inventor
허치훈
곽승호
김범래
김진환
김춘숙
박소담
양승훈
오용호
이병곤
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.)
Samsung SDI Co Ltd
Original Assignee
Samsung SDI 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 Samsung SDI Co Ltd filed Critical Samsung SDI Co Ltd
Priority to CN202510806853.2A priority Critical patent/CN120784587A/zh
Priority to CN201980026476.3A priority patent/CN111989801A/zh
Publication of WO2019203450A1 publication Critical patent/WO2019203450A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
    • H01M50/627—Filling ports
    • H01M50/636—Closing or sealing filling ports, e.g. using lids
    • 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
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
    • H01M50/627—Filling ports
    • 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
    • H01M50/147—Lids or covers
    • 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
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • 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
    • H01M50/183—Sealing members
    • H01M50/19—Sealing members characterised by the material
    • 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
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • 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 disclosure relates to a secondary battery, and more particularly, to a secondary battery for sealing an electrolyte injection hole provided in a cap plate with a sealing stopper.
  • Secondary batteries unlike primary batteries, are batteries that repeatedly perform charging and discharging. Small capacity rechargeable batteries are used in portable electronic devices such as mobile phones, notebook computers and camcorders. Large-capacity and high-density secondary batteries are used to power motors or store energy for hybrid and electric vehicles.
  • the secondary battery includes an electrode assembly for charging and discharging, a case accommodating the electrode assembly, a cap plate coupled to the opening of the case and having an electrolyte injection hole, and a sealing stopper for sealing the electrolyte injection hole.
  • the manufacturing process of the secondary battery includes an electrode process, an assembly process and a chemical conversion process.
  • the assembly process includes initial charging (precharging) immediately after assembling the secondary battery, and the initial charging generates gas inside the secondary battery.
  • the chemical conversion process is a process that proceeds to have a function of the assembled secondary battery as a battery.
  • the chemical conversion process is a charging process in which a secondary battery is sealed after removing a gas generated during initial charging.
  • the chemical conversion process converts chemical energy into electrochemical energy by supplying electrical energy to a secondary battery.
  • the active materials of the positive electrode and the negative electrode change from a low energy state to a high energy state.
  • gas is also generated inside the secondary battery.
  • the electrolyte is a carbonate-based organic solvent
  • a portion of the electrolyte is decomposed during the initial filling process, and gas is generated and discharged before the chemical conversion process. Since the secondary battery is sealed after the initial charging and before the chemical conversion process, the gas generated by the chemical conversion process increases the internal pressure of the secondary battery.
  • One aspect of the present invention is to provide a secondary battery that discharges and removes the gas generated in the chemical conversion process to the electrolyte injection hole, and then seals the electrolyte injection hole with a sealing stopper.
  • a secondary battery includes a case accommodating an electrode assembly and an electrolyte solution that charges and discharges, a cap plate that seals an opening of the case and includes an electrolyte injection hole, and a sealing stopper that seals the electrolyte injection hole. It includes, The sealing stopper includes a first coupling portion for sealing the inner portion of the electrolyte injection port, and a second coupling portion connected to the first coupling portion, sealing the outer portion of the electrolyte injection hole.
  • the electrolyte injection hole according to an embodiment of the present invention includes a first injection portion formed as a first inner circumferential surface, and a second injection portion connected to the first injection portion and formed as a second inner circumferential surface larger than the first inner circumferential surface. Can be.
  • the first injection unit may be formed as a cylindrical through-hole of the first inner circumferential surface
  • the second injection portion may be formed as an expandable through-hole gradually extending the second inner circumferential surface
  • the first coupling part is formed of a cylinder corresponding to the cylindrical through hole
  • the second coupling part is connected to the first coupling part and the cylindrical part corresponding to the first injection part and the Connected to the cylinder portion may include a cone portion corresponding to the second injection portion.
  • the second coupling part according to an embodiment of the present invention may be buried in the second injection part to form the same plane as the outer surface of the cap plate.
  • the sealing plug according to an embodiment of the present invention may further include a fixing part connected to the first coupling part and fixed to an inner portion of the first injection part.
  • An inner surface around the electrolyte injection hole according to an embodiment of the present invention may form one plane with an inner surface of the cap plate.
  • the inner surface around the electrolyte injection hole according to an embodiment of the present invention may form a protrusion protruding into the case from the inner surface of the cap plate.
  • the first injection unit may define the first inner circumferential surface as a first cylindrical through hole
  • the second injection unit may define the second inner circumferential surface as a second cylindrical through hole larger than the first cylindrical through hole. Can be.
  • the sealing stopper according to an embodiment of the present invention may be formed of PolyEthylene (PE), PerFluoroAlkoxy (PFA) or PolyTraFluoroEthylene (PTFE).
  • PE PolyEthylene
  • PFA PerFluoroAlkoxy
  • PTFE PolyTraFluoroEthylene
  • the secondary battery electrolyte injection hole sealing stopper according to an embodiment of the present invention is sealed to the electrolyte injection hole of the secondary battery, and is connected to the first coupling portion for sealing the inner portion of the electrolyte injection hole, and the first coupling portion, And a second engagement portion sealing the outer portion of the first injection portion.
  • the chemical conversion process is carried out with the sealing plug completely removed from the electrolyte inlet, and after the chemical conversion process (that is, after the gas generated during the chemical conversion process is removed by the electrolyte inlet)
  • the electrolyte injection opening can be sealed with a sealing stopper. Therefore, the quality of the secondary battery may be improved because the gas generated during the chemical conversion process may discharge gas remaining in the secondary battery.
  • FIG. 1 is a perspective view of a rechargeable battery according to a first exemplary embodiment of the present invention.
  • FIG. 2 is another cross-sectional view along the line II-II of FIG. 1.
  • FIG. 3 is a cross-sectional view illustrating a state in which a sealing stopper is temporarily assembled to an electrolyte injection hole provided in the cap plate of FIG. 2 (after the initial charging and before the chemical conversion process).
  • FIG. 4 is a cross-sectional view of a state in which the sealing plug is temporarily taken out of the electrolyte injection hole and the gas is discharged to the electrolyte injection hole (or before assembling) in the chemical conversion process.
  • FIG. 5 is a cross-sectional view of a state in which a sealing stopper is completely assembled into an electrolyte injection hole after discharging the gas generated during the chemical conversion process as shown in FIG. 4.
  • FIG. 6 is a cross-sectional view illustrating a state in which a sealing stopper is temporarily assembled into an electrolyte injection hole of a secondary battery according to a second embodiment of the present invention (after initial charge and before chemical conversion).
  • FIG. 7 is a cross-sectional view of a state in which the sealing stopper is temporarily withdrawn from the electrolyte injection hole and the gas is discharged to the electrolyte injection hole during the chemical conversion process, and then the sealing plug is completely assembled into the electrolyte injection hole.
  • FIG. 8 is a cross-sectional view illustrating a state in which a sealing stopper is temporarily assembled into an electrolyte injection hole of a secondary battery according to a third embodiment of the present invention (after initial charge and before chemical conversion).
  • FIG. 9 is a cross-sectional view of a state in which the sealing stopper is temporarily taken out from the electrolyte injection hole and the gas is discharged to the electrolyte injection hole during the chemical conversion step, and then the sealing plug is completely assembled into the electrolyte injection hole.
  • FIG. 10 is a cross-sectional view of a state in which a gas is discharged (or before assembling) to a electrolyte injection hole by temporarily drawing a sealing stopper from an electrolyte injection hole during a chemical forming process of a secondary battery according to a third exemplary embodiment of the present invention.
  • FIG. 11 is a cross-sectional view of a state in which a sealing stopper is completely assembled into an electrolyte injection hole after the chemical conversion process of FIG.
  • FIG. 1 is a perspective view of a rechargeable battery according to a first exemplary embodiment of the present invention
  • FIG. 2 is another cross-sectional view taken along line II-II of FIG. 1.
  • the secondary battery 1 includes an electrode assembly 10 for charging and discharging a current, a case 15 containing the electrode assembly 10, and a cap coupled to an opening of the case 15.
  • the plate 20 and the cap plate 20 may include a sealing stopper 27 for sealing the electrolyte injection hole 29 provided.
  • the secondary battery 1 may further include electrode terminals (negative and positive electrode terminals) 21 and 22 and an overcharge safety device (OSD) 40 installed on the cap plate 20.
  • OSD overcharge safety device
  • the electrode assembly 10 arranges the cathode 11 and the anode 12 on both sides of the separator 13, which is an electrical insulation material, and jelly the cathode 11, the separator 13, and the anode 12. It can be formed by rolling in a roll state.
  • the electrode assembly may be formed in a stack type in which a cathode, a separator, and a cathode are stacked.
  • Each of the negative electrode 11 and the positive electrode 12 includes coating portions 11a and 12a coated with an active material on a current collector of a metal plate, and plain portions 11b and 12b formed of a current collector exposed by not applying an active material. It may include.
  • the uncoated portion 11b of the cathode 11 may be formed at one end of the cathode 11 along the cathode 11 to be wound.
  • the uncoated portion 12b of the positive electrode 12 may be formed at one end of the positive electrode 12 along the positive electrode 12 to be wound.
  • the plain portions 11b and 12b may be disposed at both ends of the electrode assembly 10, respectively.
  • the case 15 is formed of an approximately rectangular parallelepiped to set a space for accommodating the electrode assembly 10 and the electrolyte therein, and forms an opening connecting the external and internal spaces on one surface of the rectangular parallelepiped. The opening allows insertion of the electrode assembly 10 into the case 15.
  • the cap plate 20 may be installed in the opening of the case 15 to seal the case 15.
  • the case 15 and the cap plate 20 may be made of aluminum and welded to each other.
  • the cap plate 20 may include a vent hole 24 and terminal holes H1 and H2.
  • the vent hole 24 may be sealed with a vent plate 25 to discharge the internal pressure of the secondary battery 1 when a defect occurs.
  • the vent plate 25 When the internal pressure of the secondary battery 1 reaches a set pressure (excess pressure), the vent plate 25 may be cut to open the vent hole 24.
  • the vent plate 25 may have a notch 25a for inducing an incision.
  • the cathode and anode terminals 21 and 22 may be installed in the terminal holes H1 and H2 of the cap plate 20, respectively, and may be electrically connected to the electrode assembly 10. That is, the negative electrode and the positive electrode terminals 21 and 22 may be electrically connected to the negative electrode and the positive electrode 11 and 12 of the electrode assembly 10, respectively. Therefore, the electrode assembly 10 may be drawn out of the case 15 through the cathode and anode terminals 21 and 22.
  • the cathode and anode terminals 21 and 22 may form the same structure inside the cap plate 20. Therefore, the same structure will be described together, and different structures will be described separately because different structures are formed outside the cap plate 20.
  • the cathode and anode terminals 21 and 22 are rivet terminals 21a and 22a respectively installed in the terminal holes H1 and H2 of the cap plate 20 and the rivet terminals 21a and 22a inside the cap plate 20.
  • Flanges 21b and 22b which are integrally formed in a wide range
  • plate terminals 21c and 22c which are disposed outside the cap plate 20 and are connected by riveting or welding to the rivet terminals 21a and 22a. Can be.
  • the negative electrode and the positive electrode gaskets 36 and 37 are respectively provided between the negative electrode and the rivet terminals 21a and 22a of the positive electrode terminals 21 and 22 and the inner surfaces of the terminal holes H1 and H2 of the cap plate 20, respectively. In addition, it is possible to seal and electrically insulate between the rivet terminals 21a and 22a of the anode terminals 21 and 22 and the cap plate 20.
  • the cathode and anode gaskets 36 and 37 are further installed between the flanges 21b and 22b and the inner surface of the cap plate 20 to further seal and electrically connect the flanges 21b and 22b and the cap plate 20.
  • the cathode and anode lead tabs 51 and 52 electrically connect the cathode and anode terminals 21 and 22 to the cathode and the anode 11 and 12 of the electrode assembly 10, respectively. That is, the cathode and anode lead tabs 51 and 52 are coupled to the lower ends of the rivet terminals 21a and 22a to caulk the lower ends, so that the cathode and anode lead tabs 51 and 52 are flanged 21b and 22b. While being supported at, it may be connected to the lower ends of the rivet terminals 21a and 22a.
  • the negative electrode and the positive electrode insulating members 61 and 62 are disposed between the negative electrode, the positive lead tabs 51 and 52 and the cap plate 20, respectively, and the negative and positive lead tabs 51 and 52 and the cap plate 20 are respectively provided. Can be electrically insulated.
  • the cathode and anode insulation members 61 and 62 are coupled to the cap plate 20 on one side, and the anode, anode lead tabs 51 and 52, rivet terminals 21a and 22a and flanges 21b and 22b on the other side. Since it encloses the structure of the connection can be stabilized.
  • the overcharge safety device 40 will be described in relation to the plate terminal 21c of the negative electrode terminal 21, and the top plate 46 will be described in relation to the plate terminal 22c of the positive electrode terminal 22. do.
  • the overcharge safety device 40 on the side of the negative electrode terminal 21 may generate gas inside due to overcharging of the secondary battery 1, and thus may be configured to implement an external short circuit as the internal pressure increases.
  • the overcharge safety device 40 may include a shorting tab 41 and a shorting member 43 spaced apart or shorted.
  • the shorting tab 41 may be electrically connected to the rivet terminal 21a of the negative electrode terminal 21 and disposed outside the cap plate 20 through the insulating member 31.
  • the insulating member 31 may be installed between the shorting tab 41 and the cap plate 20 to electrically insulate the shorting tab 41 and the cap plate 20. That is, the cap plate 20 may maintain a state of being electrically insulated from the negative electrode terminal 21.
  • the shorting tab 41 and the plate terminal 21c are coupled to the upper end of the rivet terminal 21a.
  • the shorting tab 41 and the plate terminal 21c may be fixed to the cap plate 20 with the insulating member 31 interposed therebetween.
  • the short circuit member 43 may be installed in the short circuit hole 42 formed in the cap plate 20.
  • the shorting tab 41 may be connected to the negative electrode terminal 21 to extend along the outside of the shorting member 43.
  • the shorting tab 41 and the shorting member 43 correspond to each other in the shorting hole 42, maintain the spaced apart state (solid line state) to face each other, and increase the internal pressure of the secondary battery 1 due to overcharging.
  • a short circuit state (virtual line state) can be formed by the inversion of the short circuit member 43.
  • the top plate 46 on the side of the positive electrode terminal 22 may electrically connect the plate terminal 22c and the cap plate 20 of the positive electrode terminal 22.
  • the top plate 46 may be interposed between the plate terminal 22c and the cap plate 20 and penetrate the rivet terminal 22a.
  • the top plate 46 and the plate terminal 22c are coupled to the top of the rivet terminal 22a to caulk the top, so that the top plate 46 and the plate terminal 22c are placed on the top of the rivet terminal 22a.
  • the plate terminal 22c may be installed outside the cap plate 20 with the top plate 46 interposed therebetween.
  • the anode gasket 37 may be further extended between the rivet terminal 22a and the top plate 46. That is, the anode gasket 37 may prevent the rivet terminal 22a and the top plate 46 from being electrically connected directly. That is, the rivet terminal 22a may be electrically connected to the top plate 46 through the plate terminal 22c.
  • the electrolyte injection hole 29 provided in the cap plate 20 allows the cap plate 20 to be coupled to the case 15 and then injects the electrolyte into the case 15. After the electrolyte injection, the electrolyte injection opening 29 may be sealed with a sealing stopper 27.
  • FIG. 3 is a cross-sectional view illustrating a state in which a sealing stopper is temporarily assembled to an electrolyte injection hole provided in the cap plate of FIG. 2 (after the initial charging and before the chemical conversion process).
  • the electrolyte injection hole 29 is treated as a preassembled sealed state with a sealing stopper 27.
  • the sealing stopper 27 may be assembled to the electrolyte injection hole 29 after discharging the gas generated during the initial charging.
  • the sealing stopper 27 may be coupled to be withdrawn from the electrolyte injection hole 29 in order to discharge the gas by opening the electrolyte injection hole 29 during the chemical conversion process.
  • Temporary assembling of the sealing stopper 27 enables extraction from the electrolyte injection opening 29 after the initial filling and before the chemical conversion process.
  • FIG. 4 is a cross-sectional view of a state in which the sealing plug is temporarily taken out of the electrolyte injection hole and the gas is discharged to the electrolyte injection hole (or before assembling) in the chemical conversion process.
  • the electrolyte injection hole 29 may discharge and remove the gas generated during the chemical conversion process by temporarily opening the preassembled sealing stopper 27.
  • the sealing stopper 27, which has been preassembled, may be reused or replaced with a new product after the chemical conversion process.
  • FIG. 5 is a cross-sectional view of a state in which a sealing stopper is completely assembled into an electrolyte injection hole after discharging the gas generated during the chemical conversion process as shown in FIG. 4.
  • the electrolyte injection hole 29 may be sealed again with a sealing plug 27 that has been preassembled.
  • the sealing stopper 27 may be replaced with a new product.
  • the sealing plug 27 is temporarily taken out of the electrolyte injection hole 29 to discharge the gas generated in the secondary battery 1 during the chemical conversion process. After that, since the electrolyte injection hole 29 is again sealed by the sealing stopper 27, gas may not remain in the secondary battery 1. That is, the quality of the secondary battery 1 can be improved.
  • the electrolyte injection hole 29 includes a first injection portion 291 formed as a first inner circumferential surface, and a second injection portion 292 formed as a second inner circumferential surface. It may include.
  • the second injection unit 292 is connected to the first injection unit 291 and is formed larger than the first inner circumferential surface.
  • the sealing plug 27 may be formed to seal the first and second injection parts 291 and 292 of the electrolyte injection hole 29.
  • the sealing stopper 27 may include a first coupling part 271 and a second coupling part 272.
  • the first coupling portion 271 seals the outer portion 91a of the first injection portion 291 after the initial charge and before the chemical conversion process (preliminary assembled state), and after the chemical conversion process, the inner side of the first injection portion 291.
  • the portion 91b can be sealed. That is, after the chemical conversion process, when the sealing stopper 27 is completely assembled to the electrolyte injection hole 29, the first coupling part 271 may seal the inner portion 91b.
  • the second coupling portion 272 is connected to the first coupling portion 271, spaced apart from the second injection portion 292 after the initial charge, before the chemical conversion process (pre-assembled state), after the chemical conversion process, the second injection portion
  • the outer portion 91a of the 292 and the first injection portion 291 can be sealed. That is, after the chemical conversion process, when the sealing stopper 27 is completely assembled to the electrolyte injection hole 29, the second coupling part 272 may seal the second injection part 292 and the outer part 91a. .
  • the boundary between the outer portion 91a and the inner portion 91b of the first injection portion 291 is a sealing plug 27 when the secondary battery 1 is handled from the electrolyte injection opening 29 before the chemical conversion process after the initial charge. It can be set in a range that can have a mutual fastening force not to be separated.
  • first injection portion 291 forms a first inner circumferential surface as a cylindrical through hole
  • second injection portion 292 gradually expands the second inner circumferential surface while going outward from the first injection portion 291. It can be formed as an expandable through hole.
  • the first coupling portion 271 may be formed as a cylinder corresponding to the cylindrical through hole.
  • the second coupling portion 272 is connected to the first coupling portion 271 and is connected to the cylindrical portion 721 and the cylindrical portion 721 corresponding to the first injection portion 291, and the second injection portion 292 is connected to the first coupling portion 271. It may include a cone 722 corresponding to the.
  • the cone portion 722 may be embedded in the second injection portion 292 after the chemical conversion process to form the same plane as the outer surface of the cap plate 20.
  • the cone portion 722 is pre-assembled sealing plug 27 to the electrolyte injection hole 29, or during the chemical conversion process, withdraw the gas by drawing or withdrawing the preassembled sealing plug 27 from the electrolyte injection port 29 When the sealing stopper 27 is completely assembled to the electrolyte injection opening 29, the handling of the sealing stopper 27 can be facilitated.
  • the first coupling portion 271 is coupled to the outer portion 91a of the first injection portion 291 when the sealing plug 27 is temporarily assembled to the electrolyte injection opening 29 after the initial charging and before the chemical conversion process. After the chemical conversion process, when the sealing stopper 27 is completely assembled to the electrolyte injection hole 29, the sealing plug 27 may be tightly coupled to the inner portion 91b of the first injection portion 291. Therefore, after the initial charging and before the chemical conversion process, the first coupling part 271 of the sealing stopper 27 may maintain the sealed state of the electrolyte injection hole 29.
  • the second coupling part 272 is spaced apart from the second injection part 292 when the sealing stopper 27 is temporarily assembled into the electrolyte injection hole 29 after the initial charging process, and after the chemical conversion process, the sealing stopper ( When the 27 is fully assembled to the electrolyte injection hole 29, the second injection portion 292 and the outer portion 91a of the first injection portion 291 may be coupled by interference fit. Therefore, after the chemical conversion process, the first and second coupling parts 271 and 272 of the sealing stopper 27 may maintain the sealing state of the electrolyte injection hole 29.
  • the inner surface of the cap plate 20 around the electrolyte injection hole 29 may form one plane with the inner surface of the cap plate 20.
  • the end portion 273 of the first coupling portion 271 may be formed smaller than the inner diameter of the first injection portion 291 to facilitate the insertion of the sealing member 27 into the electrolyte injection hole 29.
  • the end 273 may be disposed in a space between the case 15 and the cap plate 20 outside the first injection unit 291. Therefore, the coupling range of the first coupling portion 271 and the first injection portion 291 is secured to the maximum to ensure the coupling and sealing performance.
  • the sealing stopper 27 may be formed of polyethylene (PolyEthylene, PE), PFA (PerFluoroAlkoxy), or polytetrafluoroethylene (PolyTtetraFluoroEthylene, PTFE), and may have a set elastic restoring force. That is, the sealing stopper 27 can maintain the elastic restoring force even after the chemical conversion process.
  • the sealing stopper 27 is temporarily assembled in the electrolyte injection hole 29, and during the chemical conversion process, the sealing stopper 27 is temporarily withdrawn from the electrolyte injection hole 29 and generated during the chemical conversion process. Allow internal gas to be exhausted. After the chemical conversion process, the sealing stopper 27 may be elastically completely assembled to the electrolyte injection hole 29 again. That is, the sealing performance between the sealing stopper 27 and the electrolyte injection hole 29 can be secured.
  • the sealing stopper 27 when used as a temporary sealing stopper before the chemical conversion process after the initial filling, it can be manufactured by injection molding to lower the manufacturing cost. Since the sealing plug 27 is made larger than the electrolyte injection hole 29 with a set diameter, the sealing plug 27 may easily implement an interference fit for implementing the required sealing performance.
  • sealing plug 27 may be applied to the operation of removing the internal gas of the secondary battery 1 or injecting the electrolyte solution, or may be repeatedly reused in products of the same specification.
  • sealing stopper 27 may be added as an automated process during the production process of the secondary battery 1 because it enables the supply and process management in the process of assembling the secondary battery (1).
  • the sealing stopper 27 is temporarily withdrawn from the electrolyte injection opening 29 of the secondary battery 1 at the point where gas is finally generated to remove gas, thereby greatly improving the quality of the secondary battery 1. You can.
  • FIG. 6 is a cross-sectional view illustrating a state in which a sealing stopper is temporarily assembled to an electrolyte injection hole of a secondary battery according to a second embodiment of the present invention (after initial charging and before chemical conversion)
  • FIG. 7 is a state of FIG. It is sectional drawing of the state which fully sealed the sealing plug to the electrolyte injection hole after taking out a sealing stopper temporarily from the electrolyte injection hole, and discharging gas to an electrolyte injection hole.
  • the inner surface around the electrolyte injection hole 48 is a case at the inner surface of the cap plate 20. Protrusions 48P that protrude into the interior of 15 can be formed.
  • the cylindrical through hole of the first injection portion 481 of the second embodiment has a protrusion 48P. It can extend further through.
  • the first coupling portion 561 may be formed in a cylinder corresponding to the cylindrical through-hole further extending to the protrusion 48P.
  • the cylinder of the first coupling portion 561 of the second embodiment has a cylindrical through hole that extends. Correspondingly longer can be formed.
  • the second coupling part 562 is connected to the first coupling part 561 and the cylindrical part 621 and the cylindrical part 621 corresponding to the first injection part 481 further extended to the protrusion part 48P. And include a cone 622 corresponding to the second injection portion 482.
  • the cone portion 622 may be embedded in the second injection portion 482 after the chemical conversion process to form the same plane as the outer surface of the cap plate 220.
  • the cone portion 622 is pre-assembled sealing plug 56 to the electrolyte injection hole 48, or during the chemical conversion process, withdraw the gas by drawing or withdrawing the preassembled sealing plug 56 from the electrolyte injection hole 48.
  • the first coupling part 561 is an outer portion of the first injection part 481 when the sealing stopper 56 is preassembled to the electrolyte injection hole 48 after the initial charging and before the chemical conversion process.
  • the inner portion 81b of the first injection portion 481 extending to the projection 48P when the sealing stopper 56 is fully assembled to the electrolyte injection hole 48 after the chemical conversion process, and after the chemical conversion process. Can be combined into an interference fit. Therefore, after the initial charging and before the chemical conversion process, the first coupling part 561 of the sealing stopper 56 may maintain the sealed state of the electrolyte injection hole 48.
  • the inner portion 81b of the protrusion 48P and the first injection portion 481 has the same thickness as that of the cap plate 20 of the first embodiment.
  • the fastening and sealing performance with the first coupling part 561 may be further improved after the chemical conversion process.
  • the second coupling part 562 is spaced apart from the second injection part 482 when the sealing stopper 56 is temporarily assembled into the electrolyte injection hole 48 after the initial charging step, and after the chemical conversion step, the sealing stopper When the 56 is fully assembled to the electrolyte injection hole 48, it may be coupled to the second injection portion 482 and the outer portion 81a of the first injection portion 481 by interference fit. Therefore, after the chemical conversion process, the first and second coupling parts 561 and 562 of the sealing stopper 56 may maintain the sealing state of the electrolyte injection hole 48.
  • the boundary between the outer portion 81a and the inner portion 81b is formed after the initial charging, and before the chemical conversion process, the sealing plug 56 is disposed from the electrolyte injection hole 38 when the secondary battery 2 is handled. It can be determined in a range that can have a mutual fastening force not to be separated.
  • the boundary between the outer portion 81a and the inner portion 81b in the second embodiment is larger than the boundary in the first embodiment. It may be further moved inside the case 15.
  • FIG. 8 is a cross-sectional view illustrating a state in which a sealing stopper is temporarily assembled to an electrolyte injection hole of a secondary battery according to a third embodiment of the present invention (after initial charging and before chemical conversion)
  • FIG. 9 is a state of FIG. It is sectional drawing of the state which fully sealed the sealing plug to the electrolyte injection hole after taking out a sealing stopper temporarily from the electrolyte injection hole, and discharging gas to an electrolyte injection hole.
  • the first injection portion 551 of the electrolyte injection hole 55 forms a first inner circumferential surface as a first cylindrical through hole.
  • the second injection portion 552 may form the second inner circumferential surface as a second cylindrical through hole larger than the first cylindrical through hole.
  • the inner surface of the cap plate 320 around the electrolyte injection hole 55 may form a protrusion 58P protruding from the inner surface of the cap plate 320 into the case 15.
  • the first cylindrical through hole of the first injection portion 551 extends further through the protrusion 58P.
  • the first coupling portion 541 may be formed in a cylinder corresponding to the first cylindrical through-hole further extended to the protrusion (58P).
  • the second coupling portion 542 is connected to the first coupling portion 541 and the first cylindrical portion 421 and the first cylindrical portion (421) corresponding to the first injection portion 551 further extended to the protrusion (58P) (
  • the second cylindrical portion 422 connected to the 421 and corresponding to the second injection portion 552 may be included.
  • the second cylindrical portion 422 may be embedded in the second injection portion 552 after the chemical conversion process to form the same plane as the outer surface of the cap plate 320. Accordingly, the second cylindrical portion 422 temporarily assembles the sealing stopper 54 to the electrolyte injection hole 55, or, during the chemical conversion process, draws out the gas by discharging or withdrawing the preassembled sealing stopper 54 from the electrolyte injection hole 55. After discharging, when the sealing stopper 54 is fully assembled to the electrolyte injection opening 55, the handling of the sealing stopper 54 can be facilitated.
  • the first coupling part 541 is an outer portion of the first injection part 551 when the sealing stopper 54 is preassembled to the electrolyte injection hole 55 after the initial charging and before the chemical conversion process.
  • the inner portion 51b of the first injection portion 551 extending to the protrusion 58P when the sealing stopper 54 is completely assembled to the electrolyte injection opening 55 after the chemical conversion process, and is combined with 51a). Can be combined into an interference fit. Therefore, after the initial charging and before the chemical conversion process, the first coupling part 541 of the sealing stopper 54 may maintain the sealing state of the electrolyte injection hole 55.
  • the inner portion 51b of the protrusion 58P and the first injection portion 551 has the same thickness as the cap plate 320 is the cap plate 20 of the first embodiment.
  • the fastening and sealing performance with the first coupling part 571 may be further improved.
  • the second coupling part 542 is spaced apart from the second injection part 552 when the sealing stopper 54 is temporarily assembled into the electrolyte injection hole 55 after the initial charging step, and after the chemical conversion step, the sealing stopper ( When 54 is fully assembled to the electrolyte injection hole 55, the second injection portion 552 and the outer portion 51a of the first injection portion 551 may be coupled by interference fit. Therefore, after the chemical conversion process, the first and second coupling parts 541 and 542 of the sealing stopper 54 may maintain the sealing state of the electrolyte injection hole 55.
  • FIG. 10 is a cross-sectional view of a state in which a gas stopper is temporarily taken out of an electrolyte inlet during discharge of a secondary battery according to a third embodiment of the present invention to discharge gas (or before assembling) from the electrolyte inlet
  • FIG. It is sectional drawing of the state in which the sealing stopper was fully assembled in the electrolyte injection port after 10 chemical conversion processes (after the gas produced at the chemical conversion process was discharge
  • the sealing plug 47 is connected to the first coupling part 271, so that the inside of the first injection part 291 is provided. It may further include a fixing portion 373 fixed to the portion (91b).
  • the fixing part 373 is deformed when the sealing stopper 47 is temporarily assembled to the electrolyte injection hole 29 after the initial charging process, and is coupled to the outer portion 91a of the first injection part 291 by force fitting. Can be.
  • the fixing part 373 penetrates through the inner portion 91b of the first injection part 291 and the electrolyte injection hole 29. It is possible to fix the sealing plug 47 to the electrolyte injection hole 29 while being caught on the inner surface of the periphery.
  • the fixing portion 373 of the sealing stopper 27 may maintain the sealing state of the electrolyte injection hole 29 more firmly.
  • vent hole 25 vent plate
  • first and second cylinders 621 and 721 cylinders

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Filling, Topping-Up Batteries (AREA)
  • Secondary Cells (AREA)

Abstract

Une batterie secondaire (batterie rechargeable) selon un mode de réalisation de la présente invention comprend : un boîtier pour recevoir un ensemble d'électrodes pour effectuer une charge et une décharge et une solution électrolytique ; une plaque de capuchon scellant l'ouverture du boîtier et ayant un trou d'injection de solution électrolytique ; et un capuchon d'étanchéité pour sceller le trou d'injection de solution électrolytique, le capuchon d'étanchéité comprenant une première partie de couplage pour sceller la partie interne du trou d'injection de solution électrolytique, et une seconde partie de couplage reliée à la première partie de couplage de manière à sceller la partie externe du trou d'injection de solution électrolytique.
PCT/KR2019/003015 2018-04-17 2019-03-15 Batterie secondaire Ceased WO2019203450A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202510806853.2A CN120784587A (zh) 2018-04-17 2019-03-15 可再充电电池
CN201980026476.3A CN111989801A (zh) 2018-04-17 2019-03-15 二次电池

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2018-0044567 2018-04-17
KR1020180044567A KR102538094B1 (ko) 2018-04-17 2018-04-17 이차전지

Publications (1)

Publication Number Publication Date
WO2019203450A1 true WO2019203450A1 (fr) 2019-10-24

Family

ID=68238918

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2019/003015 Ceased WO2019203450A1 (fr) 2018-04-17 2019-03-15 Batterie secondaire

Country Status (3)

Country Link
KR (1) KR102538094B1 (fr)
CN (2) CN111989801A (fr)
WO (1) WO2019203450A1 (fr)

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CN114600288A (zh) * 2019-12-18 2022-06-07 株式会社Lg新能源 具有柔性输入部分的圆柱形二次电池
EP4404371A4 (fr) * 2022-06-20 2025-03-26 Contemporary Amperex Technology (Hong Kong) Limited Ensemble capuchon d'extrémité, élément de batterie, batterie et appareil électrique

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KR20240009708A (ko) * 2022-07-14 2024-01-23 주식회사 엘지에너지솔루션 이차전지의 제조방법, 가스배출 및 전해액 주액기구 및 이를 포함하는 이차전지

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Publication number Priority date Publication date Assignee Title
CN114600288A (zh) * 2019-12-18 2022-06-07 株式会社Lg新能源 具有柔性输入部分的圆柱形二次电池
CN114600288B (zh) * 2019-12-18 2025-09-12 株式会社Lg新能源 圆柱形二次电池和制造圆柱形二次电池的方法
EP4404371A4 (fr) * 2022-06-20 2025-03-26 Contemporary Amperex Technology (Hong Kong) Limited Ensemble capuchon d'extrémité, élément de batterie, batterie et appareil électrique

Also Published As

Publication number Publication date
CN111989801A (zh) 2020-11-24
CN120784587A (zh) 2025-10-14
KR102538094B1 (ko) 2023-05-26
KR20190121069A (ko) 2019-10-25

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