WO2014017091A1 - Batterie secondaire - Google Patents

Batterie secondaire Download PDF

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Publication number
WO2014017091A1
WO2014017091A1 PCT/JP2013/004515 JP2013004515W WO2014017091A1 WO 2014017091 A1 WO2014017091 A1 WO 2014017091A1 JP 2013004515 W JP2013004515 W JP 2013004515W WO 2014017091 A1 WO2014017091 A1 WO 2014017091A1
Authority
WO
WIPO (PCT)
Prior art keywords
plate
battery case
secondary battery
gasket
sealing body
Prior art date
Application number
PCT/JP2013/004515
Other languages
English (en)
Japanese (ja)
Inventor
佑治 大竹
啓介 清水
Original Assignee
パナソニック株式会社
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 パナソニック株式会社 filed Critical パナソニック株式会社
Publication of WO2014017091A1 publication Critical patent/WO2014017091A1/fr

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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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • 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
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/167—Lids or covers characterised by the methods of assembling casings with lids by crimping
    • 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
    • H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
    • 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
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/171—Lids or covers characterised by the methods of assembling casings with lids using adhesives or sealing agents
    • 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
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • H01M50/188—Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
    • 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 secondary battery in which an opening of a battery case is sealed by a sealing body via a gasket.
  • a conventional secondary battery (hereinafter sometimes simply referred to as “battery”) has the following configuration.
  • a concave portion that is recessed toward the inside of the battery case is formed on a side surface portion of the battery case.
  • the sealing body is arrange
  • the open end of the battery case is caulked to the peripheral edge of the sealing body via a gasket.
  • the opening of the battery case is sealed by the sealing body via a gasket between the battery case and the sealing body.
  • the gasket and the battery case are electrically insulated by the gasket.
  • a sealing agent may be applied to the inner surface of the recess of the battery case.
  • an organic solvent is used as the electrolytic solution, if the electrolytic solution adheres to the sealing agent when the electrolytic solution is injected, the sealing property may be dissolved, resulting in a decrease in airtightness.
  • the gasket interposed between the sealing body and the battery case is composed of at least two layers of a base resin layer and a surface resin layer in contact with the battery case.
  • FIG. 9 is a cross-sectional view showing a configuration of a part of the battery, specifically, a cross-sectional view showing a configuration of the open end portion of the battery case caulked to the peripheral portion of the sealing body via a gasket.
  • the open end of the battery case 105 is caulked to the peripheral edge of the sealing body 110 via a gasket 117.
  • an object of the present invention is to provide a secondary battery in which an opening of a battery case is sealed by a sealing body via a gasket, and even if the gasket may melt, the sealing body and the battery case are short-circuited. It is to prevent that.
  • a secondary battery according to the present invention is a secondary battery having an electrode group in which a positive electrode plate and a negative electrode plate are wound through a separator therebetween, and a cylindrical battery case that houses the electrode group;
  • a sealing body that seals the opening of the battery case via a first gasket between the battery case, and the opening end of the battery case is located at the periphery of the sealing body via the first gasket.
  • a ring-shaped insulating plate is disposed between the peripheral edge portion of the sealing body and the caulked portion of the battery case.
  • FIG. 1 is a cross-sectional view showing a configuration of a secondary battery according to the first embodiment of the present invention.
  • FIG. 2 is a perspective view showing the configuration of the insulating plate.
  • FIG. 3 is a cross-sectional view showing the configuration of the secondary battery according to the first modification of the first embodiment of the present invention.
  • FIG. 4 is a perspective view showing the configuration of the insulating plate.
  • FIG. 5 is a cross-sectional view showing the configuration of the secondary battery according to the second modification of the first embodiment of the present invention.
  • FIG. 6 is a perspective view showing the configuration of the insulating plate.
  • FIG. 7 is a cross-sectional view showing a configuration of a secondary battery according to the second embodiment of the present invention.
  • FIG. 8 is a cross-sectional view showing a configuration of a secondary battery according to another example of the first embodiment of the present invention.
  • FIG. 9 is a cross-sectional view showing a configuration of a part of the battery.
  • the present inventors have found that the upper surface of the peripheral portion of the sealing body 110 and the crimped portion of the battery case 105 are most likely to come into contact with each other. I found it. In other words, the probability that the upper surface of the peripheral portion of the sealing body 110 and the caulking portion of the battery case 105 are in contact with each other due to melting of the gasket 117 is greater than the probability that the side surface of the sealing body 110 and the battery case 105 are in contact with each other due to melting of the gasket 117.
  • the present inventors have found that the cost is high.
  • the caulking portion of the battery case 105 is C-shaped as shown in FIG. 9, the distance between the end of the caulking portion of the battery case 105 and the upper surface of the peripheral portion of the sealing body 110 is the shortest. For this reason, the end of the caulking portion of the battery case 105 is most easily in contact with the upper surface of the peripheral portion of the sealing body 110.
  • Contact between the end of the caulking portion of the battery case 105 and the upper surface of the peripheral portion of the sealing body 110 is line contact.
  • the contact between the side surface of the sealing body 110 and the battery case 105 is a surface contact. Line contact is more likely to occur than surface contact. Therefore, the upper surface of the peripheral part of the sealing body 110 and the caulking part of the battery case 105 are most easily in contact with each other.
  • FIG. 1 is a cross-sectional view showing the configuration of the secondary battery according to the present embodiment.
  • FIG. 2 is a perspective view showing the configuration of the insulating plate.
  • a case where a lithium ion secondary battery is used as the secondary battery will be described as a specific example.
  • an electrode group 4 in which a positive electrode plate 1 and a negative electrode plate 2 are wound through a separator 3 between them is housed in a cylindrical battery case 5 together with an electrolytic solution.
  • the positive electrode plate 1 includes a positive electrode current collector and a positive electrode mixture layer that is formed on the positive electrode current collector and includes a positive electrode active material.
  • the negative electrode plate 2 has a negative electrode current collector and a negative electrode mixture layer formed on the negative electrode current collector and containing a negative electrode active material.
  • the positive electrode plate 1 is connected to a sealing body 10 (specifically, a metal plate 11 constituting the sealing body 10) via a positive electrode lead 6.
  • the negative electrode plate 2 is connected to the bottom of the battery case 5 via the negative electrode lead 7.
  • An insulating plate 8 is disposed on the upper end of the electrode group 4 (the end on the opening side of the battery case 5 in the electrode group 4).
  • an insulating plate 9 is disposed on the lower end of the electrode group 4 (the end of the electrode group 4 on the bottom side of the battery case 5).
  • a dent that is recessed toward the inside of the battery case 5 is formed on the side surface of the battery case 5.
  • the sealing body 10 is disposed on the recessed portion via a gasket (first gasket) 17.
  • the opening end of the battery case 5 is caulked to the peripheral edge of the sealing body 10 via the gasket 17.
  • the opening of the battery case 5 is sealed by the sealing body 10 via the gasket 17 between the battery case 5 and the sealing body 10.
  • a sealant may be applied to the inner surface of the recess.
  • the battery case 5 has a recessed portion and a caulking portion (that is, an opening end portion) that is caulked to the peripheral edge portion of the sealing body 10 via the gasket 17.
  • the cross-sectional shape of the caulking portion of the battery case 5 is C-shaped as shown in FIG.
  • the “caulking part of the battery case 5” refers to a bent part when the battery case 5 is caulked.
  • the battery case before forming the recess has a bottomed cylindrical shape.
  • the sealing body 10 includes a metal plate 11, a valve plate (first valve plate) 12 disposed on the metal plate 11, and a valve plate (second valve plate) disposed on the valve plate 12. ) 14, an annular PTC (Positive TemperatureefficientCoefficient) element 15 disposed on the valve plate 14, a cap 16 disposed on the PTC element 15 and also serving as a positive electrode terminal, and a peripheral portion of the valve plate 12 And a gasket (second gasket) 13 interposed between the peripheral portion of the valve plate 14.
  • the “PTC element” is an element having a positive temperature coefficient, and an internal resistance increases as the temperature rises.
  • the peripheral edge of the metal plate 11 is caulked to the peripheral edge of the cap 16 via the gasket 13.
  • the metal plate 11, the valve plate 12, the gasket 13, the valve plate 14, the PTC element 15, and the cap 16 are integrally formed.
  • the cap 14 has a portion that contacts the PTC element 15 and a protruding portion that protrudes upward.
  • “upper side” refers to a direction toward the opening side of the battery case 5 among directions in which the winding axis of the electrode group 4 extends.
  • the metal plate 11 has a peripheral portion (that is, a caulking portion that is caulked to the peripheral portion of the cap 16 via the gasket 13), a portion that contacts the valve plate 12, and a protruding portion that protrudes downward.
  • “lower side” refers to a direction toward the bottom side of the battery case 5 in a direction in which the winding axis of the electrode group 4 extends.
  • the cross-sectional shape of the caulking portion (that is, the peripheral portion) of the metal plate 11 is L-shaped as shown in FIG.
  • the “caulking portion of the metal plate 11” refers to a portion bent when the metal plate 11 is caulked.
  • the peripheral part of the metal plate before caulking is plate-shaped.
  • valve plate 12 and the central part of the valve plate 14 are in contact with each other.
  • the valve plates 12 and 14 have thin portions with a small thickness.
  • the cap 16 has an opening communicating with the outside of the battery. An opening is formed in the metal plate 11. An opening is formed in the insulating plate 8.
  • the gas generated in the battery is exhausted out of the battery as follows.
  • the pressure in the battery rises and exceeds a predetermined pressure
  • the thin portions of the valve plates 12 and 14 break.
  • the gas generated in the battery passes through the opening of the insulating plate 8, the opening of the metal plate 11, the rupture of the valve plate 12, the rupture of the valve plate 14 and the opening of the cap 16. Exhausted.
  • an insulating plate 18 is interposed between the peripheral portion of the sealing body 10 (specifically, the caulking portion of the metal plate 11 constituting the sealing body 10) and the caulking portion of the battery case 5. It is arranged. As shown in FIG. 2, the insulating plate 18 has a ring shape.
  • the insulating plate 18 is in contact with the upper surface of the caulking portion of the metal plate 11.
  • the opening end portion (that is, the caulking portion) of the battery case 5 is connected to the peripheral portion of the sealing body 10 (specifically, the metal constituting the sealing body 10) via the gasket 17 and the insulating plate 18 in order from the battery case 5 side. It is caulked to the caulking portion of the plate 11.
  • the inner end surface of the ring-shaped insulating plate 18 is located on the inner side (in other words, the winding axis side of the electrode group 4) than the end surface of the caulking portion of the battery case 5. preferable.
  • the insulating plate 18 is preferably made of a high melting point material having a higher melting point than the material of the gasket 17.
  • the gasket 17 is made of PP (polypropylene)
  • the insulating plate 18 is made of, for example, PFA (polytetrafluoroethylene-co-perfluoropropylvinylether), PTFE (polytetrafluoroethylene).
  • PFA polytetrafluoroethylene-co-perfluoropropylvinylether
  • PTFE polytetrafluoroethylene
  • PPS polyphenylene sulfide
  • PBT polybutylene terephthalate
  • Pl polyimide
  • the insulating plate 18 is more preferably made of a high melting point material having a mechanical strength (tensile strength) lower than that of the gasket 17.
  • the insulating plate 18 is more preferably made of, for example, PFA or PTFE.
  • the caulking portion of the metal plate 11 between the peripheral portion of the sealing body 10 (specifically, the caulking portion of the metal plate 11 constituting the sealing body 10) and the caulking portion of the battery case 5.
  • An insulating plate 18 that abuts on the upper surface is disposed, and the insulating plate 18 is made of a high melting point material having a higher melting point than the material of the gasket 17. For this reason, even if the gasket 17 is melted when the battery is exposed to a high temperature environment, the insulating plate 18 is not melted. Therefore, the upper surface of the caulking portion of the metal plate 11 and the caulking portion of the battery case 5 are not melted. Can be prevented from coming into contact with each other. Therefore, it is possible to prevent the sealing body 10 (specifically, the metal plate 11 constituting the sealing body 10) and the battery case 5 from being short-circuited.
  • the insulating plate 18 is made of a high melting point material having lower strength than the material of the gasket 17.
  • FIG. 3 is a cross-sectional view showing the configuration of the secondary battery according to this modification.
  • FIG. 4 is a perspective view showing the configuration of the insulating plate.
  • the same components as those in the first embodiment are denoted by the same reference numerals as those in FIG. Therefore, in this modification, the description similar to that of the first embodiment is omitted as appropriate.
  • the ring-shaped insulating plate 18 is in contact with the upper surface of the caulking portion of the metal plate 11.
  • the ring-shaped insulating plate 18 ⁇ / b> X is in contact with the upper surface and the side surface of the caulking portion of the metal plate 11.
  • the insulating plate 18X has a flat portion and a protruding portion that protrudes downward from the outer end portion of the flat portion.
  • the flat portion is in contact with the upper surface of the caulking portion of the metal plate 11.
  • the protruding portion is in contact with the side surface of the caulking portion of the metal plate 11.
  • the cross-sectional shape of the insulating plate 18X is L-shaped.
  • the probability that the upper surface of the peripheral portion of the sealing body and the caulking portion of the battery case are in contact with each other due to melting of the gasket is higher than the probability that the side surface of the sealing body and the battery case are in contact with each other due to melting of the gasket. Therefore, in the first embodiment, as shown in FIG. 1, the insulating plate 18 is disposed in a region where the contact probability is relatively high. Specifically, the metal plate 11 is caulked between the upper surface of the peripheral portion of the sealing body 10 (specifically, the caulking portion of the metal plate 11 constituting the sealing body 10) and the caulking portion of the battery case 5. An insulating plate 18 that contacts the upper surface of the part is disposed.
  • the insulating plate 18X is disposed not only in the region where the contact probability is relatively high but also in the region where the contact probability is relatively low. Specifically, not only between the upper surface of the caulking portion of the metal plate 11 and the caulking portion of the battery case 5, but also between the side surface of the caulking portion of the metal plate 11 and the caulking portion of the battery case 5. An insulating plate 18X that contacts the upper and side surfaces of the caulking portion of the plate 11 is disposed.
  • the same effect as that of the first embodiment can be obtained. Specifically, even if the gasket 17 is melted, the insulating plate 18X having a melting point higher than that of the gasket 17 is not melted. Therefore, the upper surface of the caulking portion of the metal plate 11 and the caulking portion of the battery case 5 are not melted. Can be prevented from coming into contact with each other. Therefore, it is possible to prevent the sealing body 10 (specifically, the metal plate 11 constituting the sealing body 10) and the battery case 5 from being short-circuited. Further, the insulating plate 18X is made of a high melting point material having lower strength than the material of the gasket 17, thereby preventing the gasket 17 from cracking and the gasket 17 from cracking when the battery case 5 is caulked. be able to.
  • the insulating plate 18X has a protruding portion that contacts the side surface of the caulking portion of the metal plate 11. Thereby, it can prevent that the side surface of the crimping part of the metal plate 11 and the crimping part of the battery case 5 contact. Therefore, it is possible to further prevent the sealing body 10 (specifically, the metal plate 11 constituting the sealing body 10) and the battery case 5 from being short-circuited.
  • FIG. 5 is a cross-sectional view showing the configuration of the secondary battery according to this modification.
  • FIG. 6 is a perspective view showing the configuration of the insulating plate.
  • the same components as those in the first embodiment are denoted by the same reference numerals as those in FIG. Therefore, in this modification, the description similar to that of the first embodiment is omitted as appropriate.
  • the ring-shaped insulating plate 18 is in contact with the upper surface of the caulking portion of the metal plate 11.
  • the ring-shaped insulating plate 18Y has a flat portion and a protruding portion protruding upward from the inner end portion of the flat portion.
  • the flat portion is in contact with the upper surface of the caulking portion of the metal plate 11.
  • the protruding portion is in contact with the side surface of the protruding portion of the cap 14.
  • the cross-sectional shape of the insulating plate 18Y is L-shaped.
  • the same effect as that of the first embodiment can be obtained. Specifically, even if the gasket 17 is melted, the insulating plate 18Y having a melting point higher than that of the gasket 17 is not melted. Therefore, the upper surface of the caulking portion of the metal plate 11 and the caulking portion of the battery case 5 are not melted. Can be prevented from coming into contact with each other. Therefore, it is possible to prevent the sealing body 10 (specifically, the metal plate 11 constituting the sealing body 10) and the battery case 5 from being short-circuited.
  • the insulating plate 18Y is made of a high melting point material having lower strength than the material of the gasket 17, it is possible to prevent the gasket 17 from cracking and the gasket 17 from cracking when the battery case 5 is caulked. be able to.
  • the insulating plate 18Y has a protruding portion that contacts the side surface of the protruding portion of the cap 16.
  • FIG. 7 is a cross-sectional view showing the configuration of the secondary battery according to the present embodiment.
  • the same components as those in the first embodiment are denoted by the same reference numerals as those in FIG. Therefore, in this embodiment, the same description as that of the first embodiment is omitted as appropriate.
  • the peripheral portion of the sealing body 10 (specifically, the caulking portion of the metal plate 11 constituting the sealing body 10) and the caulking portion of the battery case 5.
  • the disposed insulating plate 18 is in contact with the caulking portion of the metal plate 11.
  • the opening end portion (that is, the caulking portion) of the battery case 5 is caulked to the peripheral edge portion of the sealing body 10 via the gasket 17 and the insulating plate 18 in order from the battery case 5 side.
  • the insulating plate 18 ⁇ / b> Z disposed between the caulking portion of the metal plate 11 and the caulking portion of the battery case 5 is used as the caulking portion of the battery case 5. Abut. The opening end portion of the battery case 5 is caulked to the peripheral edge portion of the sealing body 10 via the insulating plate 18Z and the gasket 17 in order from the battery case 5 side.
  • the insulating plate 18 ⁇ / b> Z has a shape along the caulking portion of the battery case 5.
  • the inner end surface of the ring-shaped insulating plate 18 ⁇ / b> Z is located on the inner side (in other words, the winding axis side of the electrode group 4) than the end surface of the caulking portion of the battery case 5. preferable.
  • the same effect as that of the first embodiment can be obtained. Specifically, even if the gasket 17 is melted, the insulating plate 18Z having a melting point higher than that of the gasket 17 is not melted. Therefore, the upper surface of the caulking portion of the metal plate 11 and the caulking portion of the battery case 5 are not melted. Can be prevented from coming into contact with each other. Therefore, it is possible to prevent the sealing body 10 (specifically, the metal plate 11 constituting the sealing body 10) and the battery case 5 from being short-circuited. Furthermore, the insulating plate 18Z is made of a high melting point material having lower strength than the material of the gasket 17, thereby preventing the gasket 17 from cracking and the gasket 17 from cracking when the battery case 5 is caulked. be able to.
  • the sealing body 10 includes a metal plate 11, It has a valve plate 12, a gasket 13, a valve plate 14, a PTC element 15, and a cap 16, and the peripheral portion of the metal plate 11 is caulked to the peripheral portion of the cap 16 via the gasket 13.
  • the present invention is not limited thereto.
  • the sealing body 20 includes a metal plate 21, a valve plate 22, a gasket 23, a valve plate 24, a PTC element 25, and a cap 26.
  • the portion may not be caulked to the peripheral edge portion of the cap 16 via the gasket 23.
  • the upper surface of the peripheral portion of the cap 26 is brought into contact between the peripheral portion of the sealing body 20 (specifically, the peripheral portion of the cap 26 constituting the sealing body 20) and the caulking portion of the battery case 5.
  • a ring-shaped insulating plate 28 is provided.
  • the cap 26 and the caulking portion of the battery case 5 are in contact with the upper surface of the peripheral portion of the cap 26 and have the same shape as the insulating plate 18 of the first embodiment.
  • the insulating plate 28 is disposed has been described as a specific example, the present invention is not limited to this.
  • An insulating plate having a projecting portion that comes into contact with the side surface (the end surface of the cap) may be disposed.
  • An insulating plate having a protruding portion that abuts on the side surface of the plate may be disposed.
  • an insulating plate that is in contact with the caulking portion of the battery case and has the same shape as the insulating plate 18Z of the second embodiment is disposed between the peripheral portion of the cap and the caulking portion of the battery case. It may be provided.
  • the sealing body 10 includes a metal plate 11, It has a valve plate 12, a gasket 13, a valve plate 14, a PTC element 15, and a cap 16, and the peripheral portion of the metal plate 11 is caulked to the peripheral portion of the cap 16 via the gasket 13.
  • the sealing body has at least a metal plate and a cap disposed above the metal plate, and the peripheral portion of the metal plate may be caulked to the peripheral portion of the cap.
  • the reason why the sealing body 10 includes the valve plate 12, the gasket 13, and the valve plate 14 is as follows. Depending on the reason. It is preferable to have a function of cutting off the current flowing between the metal plate 11 and the cap 16 when gas is generated in the battery and the pressure in the battery rises and exceeds a predetermined pressure. Therefore, the sealing body 10 has a thin wall portion that can be broken when the pressure in the battery exceeds a predetermined pressure, and the central portions of the valve plates 12 and 14 are in contact with each other.
  • the gasket 13 is interposed between the peripheral edge and the peripheral edge of the valve plate 14.
  • valve plate 12 and the valve plate 14 are separated from each other. Therefore, the metal plate 11 and the cap 16 that are electrically connected via the valve plates 12 and 14 It is possible to cut off the current flowing between.
  • the reason why the sealing body 10 has the PTC element 15 is as follows. It is preferable that the battery has a function of interrupting current flowing between the metal plate 11 and the cap 16 when the temperature in the battery rises and exceeds a predetermined temperature. Therefore, the sealing body 10 is interposed between the valve plate 14 electrically connected to the metal plate 11 and the cap 16, and the internal resistance can be increased when the temperature in the battery exceeds a predetermined temperature. PTC element 15 is included. As a result, when the internal resistance of the PTC element 15 increases, the current flowing between the valve plate 14 and the cap 16 is cut off, so that the gap between the metal plate 11 and the cap 16 electrically connected to the valve plate 14 is reduced. It is possible to cut off the current flowing through the.
  • the sealing body does not necessarily need to have the two valve plates 12 and 14 and the gasket 13.
  • the sealing body may have a metal plate, a PTC element disposed on the metal plate, and a cap disposed on the PTC element.
  • the sealing body does not necessarily need to have the PTC element 15.
  • the sealing body includes a metal plate, a first valve plate disposed on the metal plate, a second valve plate disposed on the first valve plate, and a second valve plate. You may have the cap arrange
  • the present invention can prevent the sealing body and the battery case from being short-circuited even if the gasket is melted, and the secondary battery in which the opening of the battery case is sealed by the sealing body via the gasket Useful for.

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

Abstract

L'invention concerne une batterie secondaire comprenant un boîtier cylindrique (5) de batterie contenant un groupe d'électrodes (4), et un corps d'étanchéité (10) qui rend étanche l'ouverture du boîtier (5) de batterie par l'intermédiaire d'un premier joint (17) qui est interposé entre le boîtier (5) de batterie et l'élément d'étanchéité (10). La partie d'extrémité de l'ouverture du boîtier (5) de batterie est matée sur la partie périphérique du corps d'étanchéité (10), le premier joint (17) étant interposé entre les deux parties. Une plaque isolante annulaire (18) est agencée entre la partie périphérique du corps d'étanchéité (10) et la partie matée du boîtier (5) de batterie.
PCT/JP2013/004515 2012-07-26 2013-07-24 Batterie secondaire WO2014017091A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012165657 2012-07-26
JP2012-165657 2012-07-26

Publications (1)

Publication Number Publication Date
WO2014017091A1 true WO2014017091A1 (fr) 2014-01-30

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Application Number Title Priority Date Filing Date
PCT/JP2013/004515 WO2014017091A1 (fr) 2012-07-26 2013-07-24 Batterie secondaire

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WO (1) WO2014017091A1 (fr)

Cited By (6)

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CN109952665A (zh) * 2017-05-22 2019-06-28 株式会社Lg化学 包含防腐蚀垫圈的圆柱形电池
CN110800132A (zh) * 2017-07-20 2020-02-14 三洋电机株式会社 圆筒形电池
CN111373565A (zh) * 2017-10-11 2020-07-03 三星Sdi株式会社 二次电池
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WO2022138423A1 (fr) 2020-12-22 2022-06-30 三洋電機株式会社 Batterie scellée hermétiquement
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CN110800132A (zh) * 2017-07-20 2020-02-14 三洋电机株式会社 圆筒形电池
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JP7081771B2 (ja) 2019-06-18 2022-06-07 エルジー エナジー ソリューション リミテッド 溝が形成されたガスケットを含む円筒型二次電池
WO2022138423A1 (fr) 2020-12-22 2022-06-30 三洋電機株式会社 Batterie scellée hermétiquement

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