WO2023054135A1 - 蓄電装置および蓄電装置の製造方法 - Google Patents

蓄電装置および蓄電装置の製造方法 Download PDF

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Publication number
WO2023054135A1
WO2023054135A1 PCT/JP2022/035254 JP2022035254W WO2023054135A1 WO 2023054135 A1 WO2023054135 A1 WO 2023054135A1 JP 2022035254 W JP2022035254 W JP 2022035254W WO 2023054135 A1 WO2023054135 A1 WO 2023054135A1
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WIPO (PCT)
Prior art keywords
power storage
lead
storage device
reinforcing member
sealing plate
Prior art date
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Ceased
Application number
PCT/JP2022/035254
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English (en)
French (fr)
Japanese (ja)
Inventor
健史 長尾
一路 清水
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Panasonic Intellectual Property Management Co Ltd
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Panasonic Intellectual Property Management Co Ltd
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Application filed by Panasonic Intellectual Property Management Co Ltd filed Critical Panasonic Intellectual Property Management Co Ltd
Priority to US18/681,122 priority Critical patent/US20250038378A1/en
Priority to JP2023551393A priority patent/JP7833662B2/ja
Priority to CN202280054395.6A priority patent/CN117795764A/zh
Priority to EP22876002.1A priority patent/EP4411976A4/en
Publication of WO2023054135A1 publication Critical patent/WO2023054135A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H01M50/578—Devices or arrangements for the interruption of current in response to pressure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/14—Arrangements or processes for adjusting or protecting hybrid or EDL capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/74—Terminals, e.g. extensions of current collectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/78—Cases; Housings; Encapsulations; Mountings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/78—Cases; Housings; Encapsulations; Mountings
    • H01G11/80—Gaskets; Sealings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/78—Cases; Housings; Encapsulations; Mountings
    • H01G11/82—Fixing or assembling a capacitive element in a housing, e.g. mounting electrodes, current collectors or terminals in containers or encapsulations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G2/00—Details of capacitors not covered by a single one of groups H01G4/00-H01G11/00
    • H01G2/14—Protection against electric or thermal overload
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G2/00—Details of capacitors not covered by a single one of groups H01G4/00-H01G11/00
    • H01G2/14—Protection against electric or thermal overload
    • H01G2/18—Protection against electric or thermal overload with breakable contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/107—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
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/152—Lids or covers characterised by their shape for cells 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
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells 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
    • H01M50/184—Sealing members characterised by their shape or structure
    • 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
    • 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
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/342—Non-re-sealable arrangements
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/559—Terminals adapted for cells having curved cross-section, e.g. round, elliptic or button cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary batteries
    • H01M2200/20—Pressure-sensitive devices
    • 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 power storage device and a method for manufacturing the power storage device.
  • Patent Document 1 a power storage device equipped with a so-called current interrupting mechanism (CID) is known (for example, Patent Document 1).
  • the power storage device of Patent Document 1 includes a cylindrical case with a bottom, a power storage element arranged in the case, leads connected to electrodes of the power storage element, and a sealing member that seals an opening of the case.
  • the sealing member has an insulating gasket including a base and a conductive sealing plate including a protrusion, and the base is arranged between the sealing plate and the storage element.
  • the projection of the sealing plate is inserted into the through hole formed in the base and connected to the lead. As the function of the current interrupting mechanism, the projection is displaced in the direction away from the lead in accordance with the increase in internal pressure in the case, thereby disconnecting the projection from the lead.
  • the power storage device includes a case having a cylindrical cylindrical portion having an open end at one end and a bottom covering the other end of the cylindrical portion, a power storage element disposed in the case and including a pair of electrodes, and a lead connected to one of a pair of electrodes; and a sealing member for sealing the open end of the case, wherein the sealing member includes a gasket having insulating properties and a conductive property.
  • the gasket has a compressed portion interposed between the tubular portion and the sealing plate, and a disk-shaped base overlapping the sealing plate, and the sealing plate is a displacement portion formed with projections protruding toward the storage element; and an outer peripheral portion provided around the displacement portion and sandwiched between the compression portions, wherein the base portion includes the sealing plate and the further comprising a reinforcing member arranged between the power storage element and reinforcing the base provided between the base and the lead, wherein the base is formed with a first through hole, A second through hole is formed in the reinforcing member at a position overlapping with the first through hole, and the projection of the sealing plate is inserted into the first through hole and the second through hole, The projection of the sealing plate and the lead are connected, and the projection and the lead are disconnected by displacing the projection in a direction away from the lead in response to an increase in internal pressure in the case. drip.
  • FIG. 1 is a cross-sectional view schematically showing the configuration of a power storage device of Embodiment 1.
  • FIG. 2 is a cross-sectional view showing an enlarged main part of the power storage device of Embodiment 1.
  • FIG. 2 is a perspective view of the sealing member of Embodiment 1 as seen from the bottom side of the case.
  • FIG. 8 is a perspective view of the sealing member of Modification 1 of Embodiment 1 as seen from the bottom side of the case.
  • FIG. 10 is a perspective view of the sealing member of Modification 2 of Embodiment 1 as seen from the bottom side of the case;
  • FIG. 11 is an enlarged cross-sectional view showing a main part of a power storage device of Modification 3 of Embodiment 1;
  • FIG. 10 is an enlarged cross-sectional view showing a main part of the power storage device of Embodiment 2;
  • Embodiments of the power storage device and the method for manufacturing the power storage device according to the present disclosure will be described below with examples. However, the disclosure is not limited to the examples described below. In the following description, specific numerical values and materials may be exemplified, but other numerical values and materials may be applied as long as the effects of the present disclosure can be obtained.
  • a power storage device may be a secondary battery or a capacitor.
  • the power storage device may be a non-aqueous electrolyte secondary battery (lithium ion secondary battery, lithium secondary battery, etc.), a nickel-hydrogen secondary battery, or the like.
  • the power storage device may be an electric double layer capacitor, a lithium ion capacitor, or the like.
  • a power storage device includes a case, a power storage element, a lead, a sealing member, and a reinforcing member.
  • the case has a cylindrical tube part with an open end at one end and a bottom part that closes the other end of the tube part.
  • the case may, for example, function as one of the electrode terminals.
  • the case functions as an electrode terminal
  • the case is made of a conductive metal, and one electrode of the storage element (electrode not electrically connected to the sealing plate described later) and the case are electrically connected. may be connected to For example, the negative electrode and the case may be electrically connected.
  • a metal case can be used for the case.
  • the metal case may be made of aluminum, iron, nickel, copper, or an alloy or clad material of these metals.
  • the case of the power storage device is not limited to the configuration described above, and a known case may be used.
  • the power storage element is arranged inside the case and includes a pair of electrodes.
  • the power storage element is not particularly limited, and may be selected according to the type of power storage device.
  • a known storage element can be used as the storage element.
  • a power storage element including a positive electrode, a negative electrode, a separator, and an electrolytic solution may be used.
  • An example of a negative electrode of a lithium ion secondary battery includes a material that reversibly absorbs and releases lithium ions as a negative electrode active material. Examples of this negative electrode active material include carbon materials such as graphite and inorganic compounds such as titanium oxide containing silicon.
  • the positive electrode of the lithium ion secondary battery may contain a transition metal composite oxide containing lithium as a positive electrode active material. Elements such as nickel, manganese, cobalt, and aluminum are included in this transition metal composite oxide.
  • the power storage device is a capacitor
  • a power storage element including two electrodes, an electrolytic solution, and a separator may be used. Those components can be selected according to the type of capacitor.
  • the lead is connected to one of the pair of electrodes of the storage element.
  • a lead used in a known power storage device may be used as the lead.
  • a strip-shaped metal foil may be used for the lead. Examples of metals (conductive metals) forming the lead include aluminum, iron, nickel, copper, or alloys or clad materials of these metals.
  • One end of the lead may be connected to either one of the pair of electrodes of the storage element, but if the storage device is a secondary battery, the lead is connected to the positive electrode, for example.
  • the sealing member seals the open end of the case.
  • the sealing member includes an insulating gasket and a conductive sealing plate.
  • the gasket has a compressed portion interposed between the cylindrical portion of the case and the sealing plate, and a disk-shaped base portion that overlaps with the sealing plate.
  • the base is arranged between the sealing plate and the storage element.
  • a first through hole is formed in the base.
  • the first through hole may be arranged in the central region of the base.
  • the shape of the first through-hole is not particularly limited, and may be circular, elliptical, oval, rectangular, polygonal, or the like, for example.
  • the gasket is made of a material that has elasticity and insulation to function as a gasket.
  • the gasket may be made of a known material used for secondary battery or capacitor gaskets. Examples of gasket materials include polypropylene (PP), polyphenylene sulfide (PPS), polybutylene terephthalate (PBT), perfluoroalkoxyalane (PFA), polyetheretherketone (PEEK), and the like. Additives (for example, known additives) may be added to these materials as needed.
  • the method of forming the gasket is not limited, and it may be formed by a method such as injection molding.
  • the sealing plate includes a displacement portion formed with a projection projecting toward the storage element, an outer peripheral portion provided around the displacement portion and sandwiched between the compressed portions of the gasket, and a thin portion connecting the displacement portion and the outer peripheral portion. and
  • the sealing plate is, for example, formed in a disc shape as a whole.
  • the displacement portion may be circular or polygonal when viewed from the axial direction of the case.
  • the outer peripheral portion provided around the displacement portion may have, for example, an annular shape when viewed from the axial direction of the case, and the thin portion may also have an annular shape.
  • the protrusion may be arranged, for example, in the center of the displacement portion.
  • the shape of the protrusion when viewed from the axial direction may be circular, elliptical, elliptical, rectangular, or polygonal.
  • the sealing plate may function as an electrode terminal, or may function as a displacement member that electrically connects the electrode terminal (eg, terminal cap) and the lead.
  • the sealing plate is made of, for example, a metal plate, such as a metal such as aluminum, nickel, copper, or iron, an alloy of these metals, or a clad material. Note that the thin portion is not necessarily required.
  • the reinforcing member is provided between the base of the gasket and the lead to reinforce the base.
  • the reinforcing member may be made of a material having a higher rigidity than the constituent material of the gasket.
  • the reinforcing member may be made of a material having higher rigidity than the lead, or may be made of the same material as the lead and designed to be thicker than the lead.
  • the reinforcing member may be an electrically conductive member and may be composed of, for example, a metal (eg, aluminum, iron, nickel, copper, stainless steel, etc.). Further, the reinforcing member may be made of insulating resin having higher rigidity than the gasket.
  • the reinforcing member and the lead may be mechanically connected by using an adhesive or the like.
  • the reinforcing member may be integrated with the base of the gasket or may be separate. In the former case, the reinforcing member may, for example, be insert molded with the gasket. In the latter case, the base mechanically locks the reinforcing member, the reinforcing member is press-fitted into a hole provided in the base, the two are fixed with an adhesive, or a through hole is formed in the reinforcing member.
  • a protrusion may be formed on the base portion, and the protrusion may be inserted into the through hole and then welded by hot-melt.
  • a second through hole is formed in the reinforcing member at a position overlapping with the first through hole.
  • the position overlapping the first through hole means that at least part of the second through hole overlaps at least part of the first through hole when viewed from the axial direction of the case.
  • the shape of the second through hole is not particularly limited, and may be, for example, circular, elliptical, oval, rectangular, polygonal, or the like. The shape of the second through hole may be the same as or different from the shape of the first through hole.
  • the projections of the sealing plate are inserted into the first through-hole and the second through-hole.
  • the projection is connected to or near the other end of the lead. That is, the leads are electrically and physically connected to the sealing plate.
  • the method of connecting the lead and the sealing plate is not particularly limited, and welding may be used, for example. However, in order to function as a current interrupting mechanism, the connection method must be such that the connection between the lead and the sealing plate is released when the force separating the lead and the sealing plate increases. When the lead and the sealing plate are connected by welding, the force required to separate the lead and the sealing plate can be adjusted by changing conditions such as the welding area and welding depth.
  • the welding method is not particularly limited, and laser welding, resistance welding, friction stirring, ultrasonic welding, etc. may be used.
  • the leads are directly connected to the sealing plate.
  • the lead and the sealing plate may be indirectly connected via a conductive member as long as it can function as a current interrupting mechanism.
  • the connection between the projection and the lead is cut off by displacing the projection in the direction away from the lead as the internal pressure inside the case rises as a function of the current interrupting mechanism.
  • the displacement may occur when the internal pressure within the case exceeds a predetermined value.
  • the base of the gasket hardly deforms because it is reinforced by the reinforcing member. Therefore, even if the lead is pulled by the displaced projection, the lead contacts the base of the gasket and the displacement of the lead is suppressed.
  • the projection is detached from the lead with little displacement, which allows the current interruption mechanism to work properly.
  • the reinforcing member may be a conductive member.
  • the reinforcing member and the lead may be electrically and mechanically connected. According to this configuration, since the lead is connected to the reinforcing member, even if the lead is pulled by the displaced projection, it becomes even more difficult to follow it. Therefore, the operational reliability of the current interrupting mechanism can be further enhanced.
  • the first connecting portion connecting the protrusion and the lead and the second connecting portion connecting the reinforcing member and the lead may be formed continuously.
  • the first connecting portion connecting the protrusion and the lead and the second connecting portion connecting the reinforcing member and the lead may be formed separately from each other.
  • the sealing plate may have a thin portion between the protrusion and the outer peripheral portion. If there is a thin portion between the outer peripheral portion and the protrusion, the outer end of the reinforcing member is located outside the inner end of the outer peripheral portion of the sealing plate or the inner peripheral wall of the annular outer peripheral portion in the radial direction of the case. may According to this configuration, in the direction of displacement, the outer end of the reinforcing member and its vicinity overlap with the outer peripheral portion of the sealing plate.
  • the outer peripheral portion is thicker and stronger than the thinned portion and is firmly held in the open end of the case.
  • a recess may be formed in the base of the gasket on the surface facing the storage element. At least part of the reinforcing member may be accommodated within the recess. With this configuration, the reinforcing member can be more reliably held by the base.
  • the base of the gasket and the reinforcing member may have through holes that overlap each other. These through holes may communicate with the displacement portion so that the internal pressure in the case is transmitted to the displacement portion.
  • a method for manufacturing a power storage device is such that, in the above-described power storage device, the first connection portion connecting the protrusion and the lead and the second connection portion connecting the reinforcing member and the lead are continuously connected to each other or A method for manufacturing power storage devices that are formed separately from each other.
  • the manufacturing method includes a welding step.
  • the first connecting portion and the second connecting portion are formed by laser welding, for example.
  • the laser output in the region between the first connection portion and the second connection portion (hereinafter also referred to as the boundary region) is made weaker than the laser output in the first connection portion and the second connection portion, or Do not irradiate the boundary area with the laser.
  • the boundary area is the area where the boundary between the projection and the reinforcing member exists. Therefore, in the boundary region, spatter is more likely to occur during laser welding than in the regions corresponding to the first connecting portion and the second connecting portion. Since the spatter can affect the quality of the power storage device, it is preferable to suppress the occurrence of the spatter.
  • the laser output in the boundary region is weakened as described above, or the boundary region is not irradiated with the laser.
  • the generation of spatter during laser welding can be suppressed, and the quality of the power storage device can be improved.
  • the lead and the reinforcing member may be joined by a joining method other than laser welding (friction stir welding, resistance welding, etc.).
  • the present disclosure by suppressing deformation of the base of the gasket, it is possible to increase the operational reliability of the current interrupting mechanism. Furthermore, according to the present disclosure, it is possible to improve the quality of the power storage device by suppressing the generation of spatter during laser welding.
  • the power storage device 10 of the present embodiment is a lithium ion secondary battery, but is not limited to this.
  • the power storage device 10 may be a lithium ion capacitor, an electric double layer capacitor, an intermediate power storage device between a lithium ion secondary battery and a lithium ion capacitor, or other electrochemical devices.
  • the power storage device 10 includes a bottomed cylindrical case 20, a power storage element 30 disposed in the case 20 and including a pair of electrodes (not shown), and a pair of electrodes (not shown).
  • a first lead 41 connected to one of the electrodes, a second lead 42 connected to the other electrode, a sealing member 50 for sealing the open end 21a of the case 20, and a reinforcing member 70 are provided.
  • Power storage device 10 further includes first and second insulating plates 61 and 62 .
  • the first and second insulating plates 61 and 62 are disk-shaped members each having a through hole.
  • the case 20 has a cylindrical portion 21 having an open end 21a at one end (upper end in FIG. 1) and a bottom portion 22 closing the other end of the cylindrical portion 21 .
  • An annular groove portion 21b protruding radially inward of the tubular portion 21 is formed in the vicinity of the open end portion 21a of the tubular portion 21 .
  • the sealing member 50 is arranged on the inner peripheral surface of the groove portion 21b.
  • the open end portion 21a of the case 20 is crimped to an outer peripheral portion 58 of a sealing plate 56, which will be described later, via a gasket 51, which will be described later. Thereby, the sealing member 50 is sandwiched between the groove portion 21b and the open end portion 21a, and the case 20 is sealed.
  • the power storage element 30 has a generally cylindrical shape.
  • the storage element 30 is configured by winding a positive electrode and a negative electrode (not shown) with a separator (not shown) interposed therebetween.
  • the first lead 41 is connected to one electrode (positive electrode in this example) of the storage element 30 .
  • the first lead 41 is made of strip-shaped metal foil, but is not limited to this.
  • the other end of the first lead 41 is connected to the projection 57 a of the sealing plate 56 .
  • sealing plate 56 functions as a positive terminal of power storage device 10 .
  • the first lead 41 is an example of a lead.
  • the second lead 42 is connected to the other electrode (negative electrode in this example) of the storage element 30 .
  • the second lead 42 is made of strip-shaped metal foil, but is not limited to this.
  • the other end of the second lead 42 is connected to the bottom portion 22 of the case 20 .
  • case 20 functions as a negative terminal of power storage device 10 .
  • the sealing member 50 includes an insulating gasket 51 and a conductive sealing plate 56 .
  • the gasket 51 has a compressed portion 52 interposed between the tubular portion 21 (groove portion 21 b ) and the sealing plate 56 , and a disk-shaped base portion 53 overlapping the sealing plate 56 .
  • the base portion 53 is arranged between the sealing plate 56 and the storage element 30 .
  • the base portion 53 has a planar shape having substantially the same size as the planar shape (circular shape) of the sealing plate 56 .
  • a circular first through hole 53 a is formed in the central region of the base portion 53 .
  • the peripheral portion of the base portion 53 and the peripheral portion 58 of the sealing plate 56 are in close contact with each other.
  • the sealing plate 56 includes a displacement portion 57 formed with a protrusion 57a protruding toward the storage element 30, an outer peripheral portion 58 provided around the displacement portion 57 and sandwiched between the compression portions 52 of the gasket 51, and the displacement portion 57. 57 and a thin portion 59 connecting the outer peripheral portion 58 .
  • the cross-sectional shape of the projection 57a (the cross-sectional shape in the cross section perpendicular to the axial direction of the case 20) is circular, but is not limited to this.
  • the thickness of the thin portion 59 is smaller than the thickness of the displacement portion 57 and the thickness of the outer peripheral portion 58 .
  • the reinforcing member 70 is provided between the base portion 53 of the gasket 51 and the first lead 41 to reinforce the base portion 53 .
  • the reinforcing member 70 is made of metal, for example.
  • a circular second through-hole 70a is formed in the reinforcing member 70 at a position overlapping with the first through-hole 53a.
  • the reinforcing member 70 of this embodiment is integrated with the gasket 51 by insert molding.
  • Reinforcing member 70 is housed in recess 53c formed in the surface of base 53 facing power storage element 30 (lower surface in FIG. 1). As shown in FIG. 2 , the reinforcing member 70 is connected to the first lead 41 at the second connecting portion 82 .
  • the reinforcing member 70 is formed in a rectangular plate shape. As shown in FIG. 2 , in the radial direction of the case 20 , the outer end (longitudinal end) of the reinforcing member 70 is located outside the inner end of the outer peripheral portion 58 of the sealing plate 56 .
  • 1 and 2 are cross-sectional views of power storage device 10 taken along the longitudinal direction of reinforcing member 70. FIG.
  • the projection 57a of the sealing plate 56 is inserted into the first through hole 53a and the second through hole 70a.
  • a gap may or may not be formed between the projection 57a and the first through hole 53a.
  • a gap may or may not be formed between the projection 57a and the second through hole 70a.
  • the projection 57 a of the sealing plate 56 is connected to the first lead 41 at the first connecting portion 81 .
  • first connecting portion 81 connecting the projection 57a and the first lead 41 and a second connecting portion 82 connecting the reinforcing member 70 and the first lead 41 are formed continuously. It is The thicknesses (vertical lengths in FIG. 2) of the first connecting portion 81 and the second connecting portion 82 are substantially the same.
  • Such first connecting portion 81 and second connecting portion 82 can be formed at once by, for example, laser welding with a constant output.
  • the base 53 of the gasket 51 is formed with a plurality of vent holes (through holes) 53b.
  • the vent hole 53 b communicates with the displacement portion 57 so that the internal pressure in the case 20 is transmitted to the displacement portion 57 .
  • the protrusion 57a of the displacement portion 57 is displaced in the direction away from the storage element 30 (that is, in the direction away from the first lead 41).
  • displacement of the first lead 41 is suppressed by the reinforcing member 70 and the base portion 53 reinforced thereby. Therefore, when the displacement of the protrusion 57a becomes large, the connection between the protrusion 57a and the first lead 41 is cut off. As a result, overcharging or the like is suppressed.
  • the reinforcing member 70 of this modified example is formed in a cross-shaped plate. With this configuration, the base 53 of the gasket 51 can be reinforced more effectively.
  • the reinforcing member 70 of this modified example is formed in a disc shape.
  • a circular third through-hole 70b is formed in the reinforcing member 70 at a position overlapping with the ventilation hole 53b.
  • the shape of the third through hole 70b is not limited to a circular shape. With this configuration, the base 53 of the gasket 51 can be reinforced more effectively.
  • the third through hole 70b is an example of a through hole.
  • a first connection portion 81 connecting the protrusion 57a and the first lead 41 and a second connection portion 82 connecting the reinforcing member 70 and the first lead 41 are different from those of the first embodiment. Although they are formed continuously in the same manner, the thickness of the connecting portion is reduced in the region between the first connecting portion 81 and the second connecting portion 82 .
  • Power storage device 10 having such first and second connection portions 81 and 82 is manufactured by a welding process in which first and second connection portions 81 and 82 are formed by laser welding. It can be manufactured by a power storage device manufacturing method including a welding step of making the laser output in the region between the connecting portion 82 weaker than the laser output in the first and second connecting portions 81 and 82 .
  • the power storage device 10 of the present embodiment differs from that of the first embodiment in the configuration of the first connection portion 81 and the second connection portion 82 . Differences from the first embodiment will be mainly described below.
  • a first connection portion 81 connecting the projection 57a and the first lead 41 and a second connection portion 82 connecting the reinforcing member 70 and the first lead 41 are formed separately from each other. It is Power storage device 10 having such first and second connection portions 81 and 82 is manufactured by a welding process in which first and second connection portions 81 and 82 are formed by laser welding. It can be manufactured by a power storage device manufacturing method that includes a welding process in which a laser is not radiated to a region between the connecting portion 82 and the connection portion 82 .
  • the present disclosure can be used for a power storage device and a method for manufacturing the power storage device.
  • REFERENCE SIGNS LIST 10 power storage device 20: case 21: cylinder 21a: opening end 21b: groove 22: bottom 30: power storage element 41: first lead (lead) 42: Second lead 50: Sealing member 51: Gasket 52: Compression part 53: Base 53a: First through hole 53b: Vent hole (through hole) 53c: concave portion 56: sealing plate 57: displacement portion 57a: protrusion 58: outer peripheral portion 59: thin portion 61: first insulating plate 62: second insulating plate 70: reinforcing member 70a: second through hole 70b: third through hole (through hole) 81: First connection part 82: Second connection part

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Connection Of Batteries Or Terminals (AREA)
PCT/JP2022/035254 2021-09-29 2022-09-21 蓄電装置および蓄電装置の製造方法 Ceased WO2023054135A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US18/681,122 US20250038378A1 (en) 2021-09-29 2022-09-21 Power storage device and method for manufacturing power storage device
JP2023551393A JP7833662B2 (ja) 2021-09-29 2022-09-21 蓄電装置および蓄電装置の製造方法
CN202280054395.6A CN117795764A (zh) 2021-09-29 2022-09-21 蓄电装置和蓄电装置的制造方法
EP22876002.1A EP4411976A4 (en) 2021-09-29 2022-09-21 ENERGY STORAGE DEVICE AND METHOD FOR MANUFACTURING ENERGY STORAGE DEVICE

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021159963 2021-09-29
JP2021-159963 2021-09-29

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WO2023054135A1 true WO2023054135A1 (ja) 2023-04-06

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US (1) US20250038378A1 (https=)
EP (1) EP4411976A4 (https=)
JP (1) JP7833662B2 (https=)
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WO (1) WO2023054135A1 (https=)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006147180A (ja) * 2004-11-16 2006-06-08 Toshiba Corp 非水電解質二次電池
JP2007200755A (ja) * 2006-01-27 2007-08-09 Sony Corp 電池
JP2015156375A (ja) * 2014-02-20 2015-08-27 三星エスディアイ株式会社Ｓａｍｓｕｎｇ ＳＤＩ Ｃｏ．，Ｌｔｄ． キャップアセンブリ、及びそれを含む二次電池
US20170194619A1 (en) * 2016-01-04 2017-07-06 Samsung Sdi Co., Ltd. Cap assembly and secondary battery including the same
JP2021125304A (ja) 2020-01-31 2021-08-30 パナソニックＩｐマネジメント株式会社 蓄電装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102493946B1 (ko) * 2015-12-24 2023-01-31 삼성에스디아이 주식회사 이차전지

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006147180A (ja) * 2004-11-16 2006-06-08 Toshiba Corp 非水電解質二次電池
JP2007200755A (ja) * 2006-01-27 2007-08-09 Sony Corp 電池
JP2015156375A (ja) * 2014-02-20 2015-08-27 三星エスディアイ株式会社Ｓａｍｓｕｎｇ ＳＤＩ Ｃｏ．，Ｌｔｄ． キャップアセンブリ、及びそれを含む二次電池
US20170194619A1 (en) * 2016-01-04 2017-07-06 Samsung Sdi Co., Ltd. Cap assembly and secondary battery including the same
JP2021125304A (ja) 2020-01-31 2021-08-30 パナソニックＩｐマネジメント株式会社 蓄電装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4411976A4

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US20250038378A1 (en) 2025-01-30
JP7833662B2 (ja) 2026-03-23
EP4411976A4 (en) 2025-07-30
EP4411976A1 (en) 2024-08-07
JPWO2023054135A1 (https=) 2023-04-06
CN117795764A (zh) 2024-03-29

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