WO2024150716A1 - 蓄電装置 - Google Patents

蓄電装置 Download PDF

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Publication number
WO2024150716A1
WO2024150716A1 PCT/JP2024/000056 JP2024000056W WO2024150716A1 WO 2024150716 A1 WO2024150716 A1 WO 2024150716A1 JP 2024000056 W JP2024000056 W JP 2024000056W WO 2024150716 A1 WO2024150716 A1 WO 2024150716A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrode
tabs
electrode group
tab
storage device
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/JP2024/000056
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
智通 上田
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.)
Panasonic Energy Co Ltd
Original Assignee
Panasonic Energy 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 Panasonic Energy Co Ltd filed Critical Panasonic Energy Co Ltd
Priority to JP2024570175A priority Critical patent/JPWO2024150716A1/ja
Priority to CN202480007316.5A priority patent/CN120435797A/zh
Publication of WO2024150716A1 publication Critical patent/WO2024150716A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H01G11/04—Hybrid capacitors
    • H01G11/06—Hybrid capacitors with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC]
    • 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
    • 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
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • 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
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • 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

  • This disclosure relates to an electricity storage device.
  • Patent Document 1 Conventionally, there is known a power storage device that stores power to be supplied to a load device (for example, Patent Document 1).
  • the power storage device of Patent Document 1 includes a laminated electrode body having a positive electrode electrode and a negative electrode electrode, a positive electrode tab group in which positive electrode tabs protruding from the positive electrode are laminated, and a negative electrode tab group in which negative electrode tabs protruding from the negative electrode are laminated, and the positive electrode tab group and the negative electrode tab group have an extension portion that extends in a predetermined direction and a folded portion that is folded back toward the extension portion.
  • This power storage device further includes a holding portion that holds the folded portion in a state where it is folded back toward the extension portion, and an example of the holding portion is a welded portion formed by welding the area where the folded portion and the extension portion overlap.
  • multiple tabs connected to the electrodes of the electrode group may be welded by a laser irradiated in a direction toward the electrode group.
  • excessive laser output may damage the electrode body, while insufficient laser output may result in some tabs (particularly those closest to the electrode group) not being properly welded, resulting in poor welding.
  • one of the objectives of the present disclosure is to easily achieve both avoidance of damage to the electrode body and poor welding of the multiple tabs.
  • the energy storage device includes an electrode group having a first electrode and a second electrode, a plurality of tabs each connected to the first electrode and overlapping each other, and a terminal member provided on the opposite side of the electrode group across the plurality of tabs, the terminal member being welded to the plurality of tabs by a laser irradiated in a direction from the terminal member toward the electrode group, and at least the tab closest to the electrode group among the plurality of tabs has a folded portion formed by folding over a portion of the tab and having a portion of a laser mark made by the laser.
  • FIG. 1 is a vertical cross-sectional view that illustrates a schematic diagram of an electricity storage device according to an embodiment
  • FIG. 11 is a vertical cross-sectional view that illustrates a modified example of an electricity storage device.
  • the energy storage device may be a primary battery such as a lithium primary battery, or a secondary battery such as an alkaline storage battery (nickel-metal hydride battery, nickel-cadmium battery, etc.), a lithium-ion secondary battery, or a lithium metal secondary battery, or may be an energy storage device (e.g., a lithium-ion capacitor, an electric double layer capacitor) in which at least one of the positive and negative electrodes is a polarizable electrode that develops capacity through a non-Faradic reaction.
  • the energy storage device includes an electrode group, a plurality of tabs, and a terminal member.
  • the electrode group has a first electrode and a second electrode.
  • the electrode group may be, for example, a wound type electrode group formed by winding the first electrode and the second electrode with a separator interposed therebetween.
  • the outer shape of the electrode group may be, for example, cylindrical or prismatic.
  • One of the first electrode and the second electrode is a positive electrode, and the other of the first electrode and the second electrode is a negative electrode.
  • the first electrode, the second electrode, and the separator may each be in the form of a long sheet (or strip).
  • the first electrode may have a long sheet-like first current collector and a first active material layer supported on the first current collector.
  • the second electrode may have a long sheet-like second current collector and may further have a second active material layer supported on the second current collector.
  • the separator may be composed of a porous sheet having ion permeability and insulating properties. Examples of porous sheets include thin films, woven fabrics, and nonwoven fabrics having micropores.
  • the first active material layer may be provided on both sides of the first current collector, or may be provided on one side of the first current collector.
  • the first current collector is a positive electrode current collector (which may be composed of, for example, aluminum foil or aluminum alloy foil), and the first active material layer is a positive electrode active material layer (which may contain, for example, a lithium-containing transition metal oxide).
  • the first current collector is a negative electrode current collector (which may be composed of, for example, copper foil or copper alloy foil), and a negative electrode active material layer (which may contain, for example, a carbonaceous material) may be provided as the first active material layer.
  • the multiple tabs are each connected to the first electrode and are stacked on top of each other.
  • the multiple tabs may be separate from the first electrode or may be integrated with the first electrode.
  • the multiple tabs may be made of a conductor such as metal foil.
  • the number of tabs is not particularly limited, and may be, for example, two or more, three or more, four or five or more.
  • the number of tabs may be 15 or less.
  • the thickness of the tabs is not particularly limited, and may be, for example, 40 ⁇ m or more and 120 ⁇ m or less.
  • At least the tab closest to the electrode group among the multiple tabs has a folded portion formed by folding a portion of the tab, and a portion of the laser mark formed by the laser.
  • the folded portion is formed by folding a portion of the tab twice, the allowable range of laser output to avoid penetrating the tab closest to the electrode group is essentially doubled compared to when there is no folded portion. Therefore, it is easy to avoid both damage to the electrode body and poor welding of the multiple tabs.
  • only the tab closest to the electrode group may have a folded-over portion.
  • the effect of the present disclosure of increasing the allowable range of laser output can be obtained in the minimum necessary space.
  • a tab with a folded-over portion takes up more space in the power storage device than a tab without a folded-over portion, but since it is sufficient for the tab closest to the electrode group to have a folded-over portion in order to obtain the effect of the present disclosure, it is preferable that only the tab closest to the electrode group has a folded-over portion.
  • tabs other than the tab closest to the electrode group may have a folded-over portion, and the number and arrangement of tabs with folded-over portions are not particularly limited.
  • the folded portion may be formed by folding a portion of the tab twice.
  • the effect of the present disclosure of increasing the allowable range of laser output can be obtained while suppressing the disadvantage of the space occupied by the folded portion.
  • the energy storage device 10 of this embodiment is a secondary battery capable of repeated charging and discharging, and may be, for example, a lithium ion secondary battery or a lithium secondary battery (lithium metal secondary battery). As shown in FIG. 1, the energy storage device 10 includes a case 11, an electrode group 14, a plurality of tabs 15, a positive electrode terminal 16, an end surface current collector 19, a negative electrode current collector 22, and a sealing plate 23.
  • the case 11 is formed in a cylindrical shape with a bottom and an opening at one end (the lower end in FIG. 1).
  • the case 11 is made of metal.
  • a through hole 12 is formed in the center of the bottom of the case 11, through which the positive electrode terminal 16 is inserted.
  • the case 11 contains an electrolyte (not shown) together with an electrode group 14. Near the opening of the case 11, a recess 13 is formed that is recessed radially inward of the case 11.
  • the electrode group 14 has a positive electrode 14a and a negative electrode 14b.
  • the electrode group 14 is a wound type electrode group in which the positive electrode 14a and the negative electrode 14b are wound with a separator (not shown) interposed therebetween.
  • the electrode group 14 is generally cylindrical as a whole.
  • the positive electrode 14a is an example of a first electrode
  • the negative electrode 14b is an example of a second electrode.
  • the multiple tabs 15 are each connected to the positive electrode 14a and are stacked on top of each other.
  • the multiple tabs 15 may be stacked on top of each other along the direction in which the winding axis of the electrode group 14 extends (the vertical direction in FIG. 1).
  • the multiple tabs 15 are made of conductors. In this embodiment, the number of tabs 15 is eight, but this is not limited to this. Also, in FIG. 1, only four of the eight tabs 15 are illustrated.
  • the thickness of each tab 15 may be 60 ⁇ m or more and 80 ⁇ m or less.
  • An insulating member 24 is disposed between the electrode group 14 and the bottom of the case 11 to electrically insulate them from each other.
  • the insulating member 24 is made of, for example, an insulating resin.
  • the insulating member 24 may be attached to the bottom of the case 11.
  • the positive electrode terminal 16 is provided on the opposite side to the electrode group 14, with multiple tabs 15 in between.
  • the positive electrode terminal 16 is inserted into the through hole 12 in the bottom of the case 11, penetrating the bottom of the case 11.
  • the positive electrode terminal 16 is made of metal, and a rivet or the like is used.
  • the positive electrode terminal 16 is insulated from the case 11 by a positive electrode gasket 26 made of an insulating material.
  • An insulating plate 25 is placed between the positive electrode terminal 16 and the electrode group 14 to electrically insulate them from each other.
  • the positive electrode terminal 16 has a first terminal member 17 extending from the inside to the outside of the case 11, and a disk-shaped second terminal member 18 joined to the first terminal member 17 and exposed to the outside of the case 11.
  • the first terminal member 17 has a disk-shaped first portion 17a, a hollow cylindrical second portion 17b formed continuously with the first portion 17a and inserted into the through hole 12, and a third portion 17c extending radially outward from the end of the second portion 17b and joined to the second terminal member 18.
  • the first terminal member 17 is welded to the multiple tabs 15 at the first portion 17a by a laser irradiated in a direction from the first terminal member 17 toward the electrode group 14.
  • the positive electrode terminal 16 is electrically connected to the positive electrode 14a via the multiple tabs 15 and functions as an external positive electrode terminal of the energy storage device 10.
  • the first terminal member 17 is an example of a terminal member.
  • the tab 15 closest to the electrode group 14 has a folded portion 15a formed by folding a part of the tab 15 (specifically, a part of the tip side), and on which a part of the laser mark LM made by the laser is formed.
  • the folded portion 15a is disposed on the opposite side of the electrode group 14 across the insulating plate 25.
  • the laser mark LM may be formed on only one of the two tabs constituting the folded portion 15a, the one closest to the first terminal member 17, or may be formed across both tabs.
  • the folded portion 15a is formed by folding a portion of the tab 15 twice.
  • the end surface current collector 19 is made of metal. There are no particular limitations on the shape of the end surface current collector 19, and it may be, for example, generally cross-shaped overall.
  • the end surface current collector 19 is connected to the negative electrode 14b of the electrode group 14 by, for example, laser welding.
  • the negative current collector 22 is electrically connected to the end current collector 19 via a metal contact plate 21 (which may be formed, for example, in a ring shape). Thus, the negative current collector 22 is electrically connected to the negative electrode 14b.
  • the negative current collector 22 and the contact plate 21 may be welded to each other (for example, laser welding).
  • the contact plate 21 and the end current collector 19 may be welded to each other (for example, laser welding).
  • the negative current collector 22 may be directly connected to the end current collector 19. In this case, the contact plate 21 is not necessary.
  • the negative current collector 22 has one or more injection holes 22a for injecting electrolyte into the case 11.
  • the negative current collector 22 is welded (for example, laser welding) to the recess 13 of the case 11 at its outer edge.
  • the case 11 is electrically connected to the negative electrode 14b via the negative current collector 22 and the like.
  • the sealing plate 23 seals the opening of the case 11.
  • the sealing plate 23 is made of metal and is generally disk-shaped.
  • the sealing plate 23 is insulated from the case 11 by a negative electrode gasket 27.
  • the sealing plate 23 is not electrically connected to either the positive electrode 14a or the negative electrode 14b of the electrode group 14, but this is not limited to this.
  • the sealing plate 23 has an explosion-proof mechanism (not shown) that is activated when the internal pressure of the case 11 exceeds a predetermined value.
  • the method for manufacturing the power storage device 10 of the present embodiment includes a first step of preparing an electrode group 14 having a first electrode 14a and a second electrode 14b and a plurality of tabs 15 connected to the first electrode 14a, a second step of overlapping a portion of the plurality of tabs 15 with each other, a third step of folding at least a portion of the plurality of tabs 15 that is closest to the electrode group 14 to form a folded portion 15a, a fourth step of arranging a first terminal member 17 on the opposite side of the electrode group 14 with the plurality of tabs 15 sandwiched therebetween, and a fifth step of welding the plurality of overlapping tabs 15 and the first terminal member 17 by irradiating a laser in a direction from the first terminal member 17 toward the electrode group 14.
  • a rod-shaped jig may be inserted into the hollow of the electrode group 14, and the plurality of tabs 15 may be sandwiched between the jig and the first terminal member 17.
  • a part of the laser mark LM is formed by the laser on at least a part of the folded-over portion 15a of the tab 15 closest to the electrode group 14.
  • This disclosure can be used in energy storage devices.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Materials Engineering (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)
PCT/JP2024/000056 2023-01-12 2024-01-05 蓄電装置 Ceased WO2024150716A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2024570175A JPWO2024150716A1 (https=) 2023-01-12 2024-01-05
CN202480007316.5A CN120435797A (zh) 2023-01-12 2024-01-05 蓄电装置

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JP2023-003162 2023-01-12
JP2023003162 2023-01-12

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CN (1) CN120435797A (https=)
WO (1) WO2024150716A1 (https=)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0334505A (ja) * 1989-06-30 1991-02-14 Nippon Chemicon Corp コンデンサの端子構造
WO2019187775A1 (ja) * 2018-03-28 2019-10-03 三洋電機株式会社 電池及びその製造方法
WO2023054134A1 (ja) * 2021-09-29 2023-04-06 パナソニックＩｐマネジメント株式会社 蓄電装置および蓄電装置の製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0334505A (ja) * 1989-06-30 1991-02-14 Nippon Chemicon Corp コンデンサの端子構造
WO2019187775A1 (ja) * 2018-03-28 2019-10-03 三洋電機株式会社 電池及びその製造方法
WO2023054134A1 (ja) * 2021-09-29 2023-04-06 パナソニックＩｐマネジメント株式会社 蓄電装置および蓄電装置の製造方法

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JPWO2024150716A1 (https=) 2024-07-18
CN120435797A (zh) 2025-08-05

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