WO2017110246A1 - Ensemble d'électrode, et procédé de fabrication de dispositif de stockage - Google Patents

Ensemble d'électrode, et procédé de fabrication de dispositif de stockage Download PDF

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Publication number
WO2017110246A1
WO2017110246A1 PCT/JP2016/082108 JP2016082108W WO2017110246A1 WO 2017110246 A1 WO2017110246 A1 WO 2017110246A1 JP 2016082108 W JP2016082108 W JP 2016082108W WO 2017110246 A1 WO2017110246 A1 WO 2017110246A1
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WO
WIPO (PCT)
Prior art keywords
tab
tab laminate
current collector
laminate
welded portion
Prior art date
Application number
PCT/JP2016/082108
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English (en)
Japanese (ja)
Inventor
真也 奥田
雅巳 冨岡
雅人 小笠原
Original Assignee
株式会社豊田自動織機
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Application filed by 株式会社豊田自動織機 filed Critical 株式会社豊田自動織機
Priority to JP2017557763A priority Critical patent/JP6753416B2/ja
Publication of WO2017110246A1 publication Critical patent/WO2017110246A1/fr

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    • 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
    • H01G11/66—Current collectors
    • H01G11/72—Current collectors specially adapted for integration in multiple or stacked hybrid or EDL capacitors
    • 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
    • H01M10/058—Construction or manufacture
    • 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
    • H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
    • 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
    • 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
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • One aspect of the present invention relates to an electrode assembly and a method for manufacturing a power storage device.
  • Patent Document 1 When manufacturing a lithium secondary battery, a method of welding a plurality of tabs stacked on a current collector using a laser is known (see Patent Document 1).
  • a weld is formed on the end face of a tab laminate composed of a plurality of stacked tabs.
  • the value of the current flowing through each tab of the tab laminate increases as it approaches the current collector. Therefore, it is preferable to increase the cross-sectional area of the welded portion orthogonal to the stacking direction of the tab laminate in accordance with the maximum current value flowing in the tab closest to the current collector.
  • An object of one aspect of the present invention is to provide an electrode assembly and a method of manufacturing a power storage device that can adjust the electrical resistance value of each tab in accordance with the value of current flowing through each tab of the tab laminate.
  • An electrode assembly is an electrode assembly including an electrode including a tab, and includes a current collector and a tab stacked body including the stacked tabs, and the tab stacked body includes The tab laminated body is disposed on the current collector in the laminating direction of the tab laminated body, and the tab laminated body is located on the inner side from the first end surface of the tab laminated body extending along the laminating direction of the tab laminated body.
  • the cross-sectional area of the welded portion in a plane perpendicular to the stacking direction of the tab laminate is monotonously increased as the current collector approaches the thickness of the tab laminate,
  • the outer surface of the welded portion is directed outward as it approaches the current collector. Inclined with respect to the lamination direction of the tab laminate To have.
  • the cross-sectional area of the welded portion increases monotonously as it approaches the current collector over the thickness of the tab laminate. Therefore, the electrical resistance value of each tab of the tab laminate decreases as the current collector is approached. On the other hand, the value of the current flowing through each tab of the tab laminate increases as it approaches the current collector. Therefore, in the electrode assembly, the electrical resistance value of each tab can be adjusted according to the current value flowing through each tab of the tab laminate.
  • the current collector may protrude outward from the first end face of the tab laminate.
  • the inclination angle of the outer surface of the welded portion with respect to the stacking direction of the tab laminate can be increased.
  • the rate of increase in the cross-sectional area of the welded portion in the stacking direction of the tab laminate is increased.
  • the electrode assembly includes a plurality of electrodes, each of the plurality of electrodes including a main body and the tab protruding from one end of the main body, and the electrode assembly includes a plurality of stacked main bodies.
  • the length of the tab between the electrode main body and the welded portion may become shorter as the current collector is approached.
  • the heat generated in the welded portion is easily transferred to the electrode body, so that the electrode body is easily affected by heat. Even in such a case, in this electrode assembly, since the current collector is located near the tab where the distance between the electrode body and the welded portion is short, the heat generated in the welded portion is generated by the electrode body. Before the current collector. As a result, it is difficult for heat to be transferred from the welded portion to the electrode body via the tab.
  • the tab laminated body may have a second end face that is disposed on the opposite side of the tab laminated body from the first end face.
  • the end faces arranged opposite to each other across the tab laminate.
  • the positional deviation between the tabs is often larger than that of the first and second end faces.
  • the positional deviation between the tabs is large, it is difficult to monotonously increase the cross-sectional area of the welded portion over the thickness of the tab laminate as the current collector is approached.
  • the length of each tab is adjusted in order to suppress displacement between the tabs.
  • the tab laminate is disposed between the conductive member and the current collector in the stacking direction of the tab laminate, and the thickness of the conductive member in the stacking direction of the tab laminate is the stacking direction of the tab laminate It may be smaller than the thickness of the current collector.
  • the thickness of the conductive member is relatively small, the difference between the heat capacity of the conductive member and the heat capacity of the tab can be reduced.
  • the maximum length of the welded portion in the direction orthogonal to the stacking direction of the tab laminate at the first end surface of the tab laminate is orthogonal to the stacking direction of the tab laminate and the stacking direction of the tab laminate.
  • the maximum length of a portion where the welded portion and the tab laminate overlap in the stacking direction of the tab laminate may be larger.
  • the welded portion extends in a direction intersecting the stacking direction of the tab laminate.
  • the maximum weld depth of the weld in the direction perpendicular to the lamination direction of the tab laminate in the cross section of the tab laminate perpendicular to the first end surface of the tab laminate including the lamination direction of the tab laminate May be less than 2 mm.
  • the welded portion When viewed from the normal direction of the first end face of the tab laminate, the welded portion may have an outer shape including a curve.
  • a method of manufacturing a power storage device includes a case having a main body portion in which an opening is formed and a lid portion that closes the opening of the main body portion, and the above-described electrode assembly housed in the case.
  • a method of manufacturing a power storage device comprising: a step of fixing the current collector to the lid portion; a step of arranging the tab laminate on the current collector; and the step of fixing the current collector to the lid portion. Forming the welded portion by irradiating the first end surface of the tab laminated body with an energy beam in a state where the tab laminated body is disposed on the current collector.
  • the current collector and the tab laminate are paired with a pair of electrodes. It is necessary to pinch. In that case, the position of the electrode may interfere with the position of the lid.
  • the welded portion is formed by irradiation with an energy beam, so that an electrode necessary for resistance welding is not necessary. Therefore, the problem of interference due to the position of the electrode does not occur.
  • the current collector may be an unbent flat plate.
  • a method of manufacturing a power storage device includes a case having a main body portion in which an opening is formed and a lid portion that closes the opening of the main body portion, and an electrode assembly accommodated in the case.
  • the electrode assembly includes an electrode including a tab
  • the electrode assembly includes a current collector and a tab stacked body including the stacked tabs.
  • the tab laminated body is disposed on the current collector in the lamination direction of the tab laminated body, and the tab laminated body extends along the lamination direction of the tab laminated body.
  • a method of manufacturing the power storage device comprising: a step of fixing the current collector to the lid; and a step of disposing the tab laminate on the current collector.
  • the tab laminate is disposed on the current collector fixed to the lid. State, by irradiating an energy beam to the first end face of the tab laminate, and forming the weld.
  • the current collector and the tab laminate are paired with a pair of electrodes. It is necessary to pinch. In that case, the position of the electrode may interfere with the position of the lid.
  • the welded portion is formed by irradiation with an energy beam, so that an electrode necessary for resistance welding is not necessary. Therefore, the problem of interference due to the position of the electrode does not occur.
  • an electrode assembly and a method for manufacturing a power storage device that can adjust the electrical resistance value of each tab in accordance with the value of current flowing through each tab of the tab laminate.
  • FIG. 1 is an exploded perspective view of a power storage device including the electrode assembly according to the first embodiment.
  • FIG. 2 is a cross-sectional view of the power storage device taken along line II-II in FIG.
  • FIG. 3 is a perspective view of the electrode assembly according to the first embodiment.
  • 4 is a view showing a part of the electrode assembly of FIG. 3 as viewed from the X-axis direction.
  • FIG. 5 is a view showing a part of the electrode assembly of FIG. 3 as viewed from the Y-axis direction.
  • FIG. 6 is a diagram illustrating a step of the method of manufacturing the power storage device according to the first embodiment.
  • FIG. 7 is a diagram illustrating one step in the method of manufacturing the power storage device according to the first embodiment.
  • FIG. 8 is a diagram illustrating a step of the method of manufacturing the power storage device according to the first embodiment.
  • FIG. 9 is a diagram illustrating a step of the method of manufacturing the power storage device according to the first embodiment.
  • FIG. 10 is a diagram illustrating one step in the method of manufacturing the power storage device according to the first embodiment.
  • FIG. 11 is a diagram illustrating a step of the method of manufacturing the power storage device according to the first embodiment.
  • FIG. 12 is a diagram illustrating one process of the method for manufacturing the power storage device according to the second embodiment.
  • FIG. 13 is a diagram illustrating a step of the method of manufacturing the power storage device according to the second embodiment.
  • FIG. 14 is a diagram illustrating one process of the method for manufacturing the power storage device according to the third embodiment.
  • FIG. 15 is a diagram illustrating a step of the method of manufacturing the power storage device according to the third embodiment.
  • FIG. 16 is a diagram illustrating a part of an electrode assembly having a weld according to a modification.
  • FIG. 17 is a diagram illustrating the evaluation results of the examples.
  • FIG. 1 is an exploded perspective view of a power storage device including the electrode assembly according to the first embodiment.
  • FIG. 2 is a cross-sectional view of the power storage device taken along line II-II in FIG.
  • the power storage device 1 shown in FIGS. 1 and 2 is a nonaqueous electrolyte secondary battery such as a lithium ion secondary battery or an electric double layer capacitor.
  • the power storage device 1 includes a hollow case 2 having a substantially rectangular parallelepiped shape, for example, and an electrode assembly 3 accommodated in the case 2.
  • the case 2 is made of a metal such as aluminum.
  • the case 2 has a main body 2a in which an opening is formed and a lid 2b that closes the opening of the main body 2a.
  • an insulating film (not shown) is provided on the inner wall surface of the case 2.
  • a non-aqueous (organic solvent) electrolyte is injected into the case 2.
  • the positive electrode active material layer 15 of the positive electrode 11, the negative electrode active material layer 18 of the negative electrode 12, and the separator 13 described later are porous, and the pores are impregnated with the electrolytic solution. .
  • a positive electrode terminal 5 and a negative electrode terminal 6 are spaced apart from each other on the lid 2 b of the case 2.
  • the positive electrode terminal 5 is fixed to the case 2 via an insulating ring 7, and the negative electrode terminal 6 is fixed to the case 2 via an insulating ring 8.
  • the electrode assembly 3 is a stacked electrode assembly.
  • the electrode assembly 3 includes a plurality of positive electrodes 11 (electrodes), a plurality of negative electrodes 12 (electrodes), and a bag-shaped separator 13 disposed between the positive electrodes 11 and the negative electrodes 12.
  • the positive electrode 11 is accommodated in the separator 13.
  • the plurality of positive electrodes 11 and the plurality of negative electrodes 12 are alternately stacked via the separators 13.
  • the positive electrode 11 has a metal foil 14 made of, for example, an aluminum foil, and a positive electrode active material layer 15 formed on both surfaces of the metal foil 14.
  • the metal foil 14 of the positive electrode 11 includes a rectangular main body 14a and a rectangular tab 14b protruding from one end of the main body 14a.
  • the positive electrode active material layer 15 is a porous layer formed including a positive electrode active material and a binder.
  • the positive electrode active material layer 15 is formed by supporting a positive electrode active material on at least the central portion of the main body 14a on both surfaces of the main body 14a.
  • the positive electrode active material examples include composite oxide, metallic lithium, and sulfur.
  • the composite oxide includes, for example, at least one of manganese, nickel, cobalt, and aluminum and lithium.
  • the tab 14b does not carry a positive electrode active material.
  • an active material may be carried on the base end portion of the tab 14b on the main body 14a side.
  • the tab 14b extends upward from the upper edge of the main body 14a and is connected to the positive electrode terminal 5 via a current collector plate 16 (current collector).
  • the current collector plate 16 is disposed between the tab 14 b and the positive electrode terminal 5.
  • the current collector plate 16 is formed in a rectangular flat plate shape from the same material as the metal foil 14 of the positive electrode 11.
  • the plurality of stacked tabs 14b are disposed between the current collector plate 16 and a protective plate 23 (conductive member) thinner than the current collector plate 16 (see FIG. 3).
  • the protective plate 23 is formed in a rectangular flat plate shape from the same material as the metal foil 14 of the positive electrode 11.
  • the negative electrode 12 includes a metal foil 17 made of, for example, copper foil, and a negative electrode active material layer 18 formed on both surfaces of the metal foil 17. Similar to the metal foil 14 of the positive electrode 11, the metal foil 17 of the negative electrode 12 includes a rectangular main body 17a and a rectangular tab 17b protruding from one end of the main body 17a.
  • the negative electrode active material layer 18 is formed by supporting a negative electrode active material on at least a central portion of the main body 17a on both surfaces of the main body 17a.
  • the negative electrode active material layer 18 is a porous layer formed including a negative electrode active material and a binder.
  • the negative electrode active material examples include carbon such as graphite, highly oriented graphite, mesocarbon microbeads, hard carbon, and soft carbon, alkali metals such as lithium and sodium, metal compounds, SiOx (0.5 ⁇ x ⁇ 1.5 ) And the like, and boron-added carbon.
  • the tab 17b does not carry a negative electrode active material.
  • an active material may be carried on the base end portion of the tab 17b on the main body 17a side.
  • the tab 17b extends upward from the upper edge of the main body 17a and is connected to the negative electrode terminal 6 via a current collector plate 19 (current collector).
  • the current collector plate 19 is disposed between the tab 17 b and the negative electrode terminal 6.
  • the current collector plate 19 is formed in a rectangular flat plate shape from the same material as the metal foil 17 of the negative electrode 12.
  • the plurality of stacked tabs 17b are disposed between the current collector plate 19 and a protective plate 27 (conductive member) thinner than the current collector plate 19 (see FIG. 3).
  • the protection plate 27 is formed in a rectangular flat plate shape from the same material as the metal foil 17 of the negative electrode 12.
  • the separator 13 accommodates the positive electrode 11.
  • the separator 13 has a rectangular shape when viewed from the stacking direction of the positive electrode 11 and the negative electrode 12.
  • the separator 13 is formed in a bag shape by welding a pair of long sheet-like separator members to each other.
  • the material of the separator 13 include a porous film made of a polyolefin resin such as polyethylene (PE) and polypropylene (PP), a woven fabric or a non-woven fabric made of polypropylene, polyethylene terephthalate (PET), methylcellulose, and the like.
  • FIG. 3 is a perspective view of the electrode assembly according to the first embodiment.
  • 4 is a diagram (partial sectional view) showing a part of the electrode assembly of FIG. 3 as viewed from the X-axis direction.
  • FIG. 5 is a view showing a part of the electrode assembly of FIG. 3 as viewed from the Y-axis direction.
  • the electrode assembly 3 shown in FIG. 3 includes a plurality of positive electrodes 11 and a plurality of negative electrodes 12 that are stacked on each other via a separator 13.
  • Each of the plurality of positive electrodes 11 includes a main body 14a extending in the XY plane and a tab 14b protruding from one end of the main body 14a in the X-axis direction.
  • Each of the plurality of negative electrodes 12 includes a main body 17a extending in the XY plane and a tab 17b protruding from one end of the main body 17a in the X-axis direction.
  • the main bodies 14a and 17a are laminated together to form electrode main bodies 40 and 42, respectively. That is, the electrode assembly 3 includes an electrode body 40 having a plurality of main bodies 14a stacked in the Z-axis direction, and an electrode body 42 having a plurality of main bodies 17a stacked in the Z-axis direction.
  • the tabs 14b and 17b are laminated with each other to form tab laminated bodies 21 and 25, respectively.
  • the electrode assembly 3 includes a tab laminate 21 having a plurality of tabs 14b laminated in the Z-axis direction and a tab laminate 25 having a plurality of tabs 17b laminated in the Z-axis direction.
  • the tab laminates 21 and 25 are arranged apart from each other in the Y-axis direction.
  • the tab laminated body 21 includes end surfaces 21a, 21b, and 21c of the tab laminated body 21 extending along the lamination direction (Z-axis direction) of the tab laminated body 21.
  • the end surfaces 21a and 21b are surfaces that sandwich the tab laminate 21, and the end surface 21c is a surface that connects the end surfaces 21a and 21b. That is, the end surfaces 21 a and 21 b (first and second end surfaces) are arranged on opposite sides of the tab laminate 21.
  • the end surfaces 21a and 21b are surfaces along the XZ plane.
  • the end surface 21 c is a surface that is inclined with respect to the XY plane so that the thickness of the tab laminated body 21 becomes smaller toward the tip of the tab laminated body 21.
  • the tab laminate 21 is disposed between the current collector plate 16 and the protective plate 23 in the Z-axis direction. That is, the tab laminate 21 is disposed on the current collector plate 16 in the Z-axis direction.
  • the protection plate 23 is disposed on the tab laminate 21 in the Z-axis direction.
  • the protective plate 23 is not in contact with the current collector plate 16, and the protective plate 23 and the current collector plate 16 are separated from each other with the tab laminate 21 sandwiched in the stacking direction.
  • the tab laminate 21 is thicker than the protective plate 23, and the current collector plate 16 is thicker than the tab laminate 21.
  • the thickness of the protective plate 23 is larger than the thickness of the tab 14 b and smaller than the thickness of the current collector plate 16.
  • the electrode assembly 3 may not include the protection plate 23 and the current collector plate 16.
  • the length of the current collector plate 16 in the Y-axis direction is larger than the length of the tab laminate 21 in the Y-axis direction (the distance between the end faces 21a and 21b). In the Y-axis direction, the position of the outer end portion of the current collector plate 16 in the Y-axis direction coincides with the position of the end portion of the main body 14a in the Y-axis direction.
  • the length of the protective plate 23 in the Y-axis direction is substantially the same as the length of the tab laminate 21 in the Y-axis direction.
  • the tab laminated body 21 has welded portions W located on the inner side from the end faces 21a and 21b of the tab laminated body 21, respectively.
  • the maximum length W2 of the welded portion W in the direction (eg, the X-axis direction) orthogonal to the lamination direction of the tab laminate 21 on the end faces 21a, 21b of the tab laminate 21 is the lamination direction (eg, the Z-axis direction) of the tab laminate 21.
  • a direction (for example, the Y-axis direction) orthogonal to both the direction (for example, the X-axis direction) orthogonal to the stacking direction of the tab-layered structure 21, the stacking direction (for example, the Z-axis direction) of the tab stacked body 21 ) Is larger than the maximum length W1 of the portion where the welded portion W and the tab laminate 21 overlap (see FIG. 3).
  • the maximum length W1 is smaller than the maximum length of the welded portion W in the Z-axis direction.
  • the welded portion W extends to the inside of the current collector plate 16 and the protective plate 23 adjacent to the end surfaces 21a and 21b.
  • the length of the welded portion W in the X-axis direction is preferably substantially equal to the length of the protective plate 23 in the X-axis direction or shorter than the length of the protective plate 23 in the X-axis direction.
  • the welded portion W in the X-axis direction is longer than the length of the protective plate 23 in the X-axis direction, the welded portion W protrudes outside the protective plate 23 in the X-axis direction. Even in those cases, the welded portion W can be formed.
  • the cross-sectional area of the welded portion W in a plane (for example, the XY plane) orthogonal to the stacking direction (for example, the Z-axis direction) of the tab stacked body 21 is The thickness increases monotonously as the current collector plate 16 is approached.
  • the cross-sectional area of the welded portion W is the product of the weld depth D of the welded portion W and the weld length L (see FIG. 3) in the X-axis direction.
  • the outer surface Ws of the welded portion W approaches the current collector plate 16 in the cross section (for example, the YZ cross section) of the tab laminated body 21 that includes the laminating direction of the tab laminated body 21 and is orthogonal to the end faces 21 a and 21 b of the tab laminated body 21. Accordingly, the tab laminated body 21 is inclined with respect to the stacking direction so as to go outward (in a direction away from the end faces 21a and 21b).
  • the outer surface Ws of the welded portion W may be inclined with respect to the stacking direction of the tab laminate 21 so as to go outward as it approaches the current collector plate 16 over the thickness of the tab laminate 21.
  • the current collector plate 16 may protrude outward from the end faces 21 a and 21 b of the tab laminate 21, but inside the end faces 21 a and 21 b of the tab laminate 21. May be located.
  • the boundary line Wa of the welded portion W is a direction H (perpendicular to the Z axis direction).
  • H perpendicular to the Z axis direction
  • the welded portion W has two boundary lines Wa, and the welded portion W depends on the shape of the molten pool formed around the energy beam B by irradiation with an energy beam B (see FIG. 8) described later.
  • the distance between the two boundary lines Wa becomes narrower from the outer surface Ws toward the inner side.
  • the welding pool is formed so as to taper inward from the surface of the irradiation object of the energy beam B in the irradiation direction of the energy beam B.
  • the welded portion W is also formed on the current collector plate 16, the density of the current collector plate 16 is different from the density of the tab laminate 21, so the depth of the weld pool formed on the current collector plate 16 and the tab laminate 21 The depth of the weld pool formed is different.
  • the distance between the two boundary lines Wa becomes narrower from the outer surface Ws of the welded portion W toward the inside.
  • the smaller one of the angles formed by one boundary line Wa of the weld W and the direction H is ⁇
  • the other boundary line Wa of the weld W and the direction H Is the smaller angle of ⁇
  • ⁇ is the smaller angle of the angles formed by the direction J and the direction H projected from the irradiation direction of the energy beam B on the YZ plane. It becomes a value between ⁇ .
  • the smaller angle among the angles formed by the boundary line Wa in the current collector plate 16 and the direction H is ⁇
  • the boundary line Wa in the tab laminated body 21 and the direction H are Of the angles formed
  • ⁇ is the smaller angle
  • ⁇ is the smaller angle among the angles formed by the direction J and the direction H in which the irradiation direction of the energy beam B is projected on the YZ plane, so that ⁇ ⁇ ⁇ .
  • the boundary line Wa in the tab laminate 21 may extend in parallel to the lamination direction of the tab laminate 21.
  • the tab laminate 25 includes end surfaces 25a, 25b, and 25c of the tab laminate 25 that extend along the lamination direction (Z-axis direction) of the tab laminate 25.
  • the end surfaces 25a and 25b are surfaces that sandwich the tab laminate 25, and the end surface 25c is a surface that connects the end surfaces 25a and 25b. That is, the end surfaces 25 a and 25 b (first and second end surfaces) are arranged on opposite sides of the tab laminate 25.
  • the end surfaces 25a and 25b are surfaces along the XZ plane.
  • the end surface 25 c is a surface that is inclined with respect to the XY plane so that the thickness of the tab laminated body 25 becomes smaller toward the tip of the tab laminated body 25.
  • the tab laminate 25 is disposed between the current collector plate 19 and the protective plate 27 in the Z-axis direction. That is, the tab laminate 25 is disposed on the current collector plate 19 in the Z-axis direction.
  • the protection plate 27 is disposed on the tab laminate 25 in the Z-axis direction.
  • the protective plate 27 is not in contact with the current collector plate 19, and the protective plate 27 and the current collector plate 19 are separated with the tab laminate 25 sandwiched in the stacking direction.
  • the tab laminate 25 is thicker than the protective plate 27, and the current collector plate 19 is thicker than the tab laminate 25.
  • the thickness of the protection plate 27 is larger than the thickness of the tab 17 b and smaller than the thickness of the current collector plate 19.
  • the electrode assembly 3 may not include the protection plate 27 and the current collector plate 19.
  • the length of the current collector plate 19 in the Y-axis direction is larger than the length of the tab laminate 25 in the Y-axis direction (the distance between the end faces 25a and 25b).
  • the position of the outer end portion of the current collector plate 19 in the Y-axis direction matches the position of the end portion of the main body 17a in the Y-axis direction.
  • the length of the protection plate 27 in the Y-axis direction is substantially the same as the length of the tab laminate 25 in the Y-axis direction.
  • the tab laminated body 25 has welded portions W located on the inner sides from the end faces 25a and 25b of the tab laminated body 25, respectively.
  • the end surface 25 b of the tab laminated body 25 faces the end surface 21 b of the tab laminated body 21. Therefore, the end faces 21a, 21b, 25a, and 25b of the tab laminates 21 and 25 are arranged along the Y-axis direction.
  • the maximum length W2 of the welded portion W in the direction (eg, the X-axis direction) orthogonal to the lamination direction of the tab laminate 25 at the end faces 25a, 25b of the tab laminate 25 is the lamination direction (eg, the Z-axis direction) of the tab laminate 25 )
  • a direction (for example, the Y-axis direction) orthogonal to both the direction (for example, the X-axis direction) orthogonal to the stacking direction of the tab-layered structure 25, the stacking direction (for example, the Z-axis direction) of the tab stacked body 25 ) Is larger than the maximum length W1 of the portion where the welded portion W and the tab laminate 25 overlap (see FIG. 3).
  • the welded portion W extends to the inside of the current collector plate 19 and the protection plate 27 adjacent to the end surfaces 25a and 25b.
  • the length of the welded portion W in the X-axis direction is preferably substantially equal to the length of the protective plate 27 in the X-axis direction or shorter than the length of the protective plate 27 in the X-axis direction.
  • the welded portion W When the length of the welded portion W in the X-axis direction is substantially equal to the length of the protective plate 27 in the X-axis direction, the welded portion W may protrude outside the protective plate 27 in the X-axis direction due to positional displacement. When the length of the welded portion W in the X-axis direction is longer than the length of the protective plate 27 in the X-axis direction, the welded portion W protrudes outside the protective plate 27 in the X-axis direction. Even in those cases, the welded portion W can be formed.
  • the cross-sectional area of the welded portion W in a plane (for example, the XY plane) orthogonal to the stacking direction (for example, the Z-axis direction) of the tab stack 25 is The thickness increases monotonically as the current collector plate 19 is approached.
  • the tab laminated body 25 is inclined with respect to the lamination direction so as to go outward (in a direction away from the end faces 25a and 25b).
  • the outer surface Ws of the welded portion W may be inclined with respect to the stacking direction of the tab laminate 25 so as to go outward as it approaches the current collector plate 19 over the thickness of the tab laminate 25.
  • You may incline with respect to the lamination direction of the tab laminated body 25 so that it may face outside as it approaches the current collecting plate 19 over a part of thickness of 25.
  • the current collector plate 19 may protrude outward from the end faces 25a and 25b of the tab laminate 25, but inside the end faces 25a and 25b of the tab laminate 25. May be located.
  • the boundary line Wa of the welded portion W is a direction H (perpendicular to the Z axis direction).
  • H perpendicular to the Z axis direction
  • the welded portion W has two boundary lines Wa, and depending on the shape of the molten pool formed around the energy beam B by irradiation of the energy beam B described later, the welded portion W is inward from the outer surface.
  • the distance between the two boundary lines Wa becomes narrower as it goes.
  • the welding pool is formed so as to taper inward from the surface of the irradiation object of the energy beam B in the irradiation direction of the energy beam B.
  • the welded portion W is also formed on the current collector plate 19, the density of the current collector plate 19 is different from the density of the tab laminate 25, so the depth of the weld pool formed on the current collector plate 19 and the tab laminate 25 The depth of the weld pool formed is different.
  • the distance between the two boundary lines Wa becomes narrower from the outer surface of the welded portion W toward the inside.
  • the smaller one of the angles formed by one boundary line Wa of the welded portion W and the direction H is ⁇
  • the other boundary line Wa of the welded portion W and the direction H are Is the smaller angle of ⁇
  • ⁇ is the smaller angle of the angles formed by the direction J and the direction H projected from the irradiation direction of the energy beam B on the YZ plane. It becomes a value between ⁇ .
  • the smaller one of the angles formed by the boundary line Wa in the current collector plate 19 and the direction H is ⁇
  • the boundary line Wa in the tab laminate 25 and the direction H are Of the angles formed
  • ⁇ is the smaller angle
  • ⁇ is the smaller angle among the angles formed by the direction J and the direction H in which the irradiation direction of the energy beam B is projected on the YZ plane, so that ⁇ ⁇ ⁇ .
  • the boundary line Wa in the tab laminate 25 may extend in parallel to the lamination direction of the tab laminate 25.
  • the cross-sectional area of the welded portion W in the XY plane increases monotonously as it approaches the current collector plates 16 and 19 over the thickness of the tab laminates 21 and 25.
  • the outer surface Ws of the welded portion W is inclined with respect to the stacking direction of the tab laminates 21 and 25 so as to go outward as the current collector plates 16 and 19 are approached.
  • the welded portion W having such a shape is formed by the molten material moving in the stacking direction of the tab laminates 21 and 25 by, for example, at least one of gravity and surface tension when the welded portion W is formed. obtain.
  • the extending direction of the boundary line Wa of the welded portion W is controlled by, for example, the irradiation direction of the energy beam B irradiated to the end faces 21a, 21b, 25a, and 25b of the tab laminates 21 and 25 as described above. .
  • the length of the tab 17 b between the electrode main body 42 and the welded portion W may be shortened as the current collector plate 19 is approached.
  • the electrode body 42 has one end 42a and the other end 42b in the Z-axis direction, and the plurality of tabs 17b are bundled on the one end 42a side in the Z-axis direction.
  • the end of the tab 17b becomes longer as it approaches the current collector plate 19, so that the end face 25c located at the end of the tab laminate 25 becomes an inclined surface.
  • the lengths of the plurality of tabs 14 b between the electrode main body 40 and the welded portion W may be shortened as the current collector plate 16 is approached.
  • the length of the plurality of tabs 14b, 17b between the electrode main bodies 40, 42 and the welded portion W may be shortened as the current collector plates 16, 19 are approached across the tab laminates 21, 25, It may be shortened as it approaches the current collector plates 16 and 19 over a part of the tab laminates 21 and 25. Further, the lengths of the plurality of tabs 14 b and 17 b between the electrode main bodies 40 and 42 and the welded portion W may be shortened as the protective plates 23 and 27 are approached. In this case, the plurality of tabs 14b and 17b are bundled on the other end 42b side in the Z-axis direction.
  • the cross-sectional area of the welded portion W increases monotonously as the current collector plates 16 and 19 are approached over the thickness of the tab laminates 21 and 25. Yes. Therefore, as the current collector plates 16 and 19 are approached, the electric resistance values of the tabs 14b and 17b of the tab laminates 21 and 25 become smaller. On the other hand, the value of the current flowing through the tabs 14 b and 17 b of the tab laminates 21 and 25 increases as the current collectors 16 and 19 are approached. Therefore, in the electrode assembly 3, the electrical resistance value of each tab 14b, 17b can be adjusted according to the value of the current flowing through each tab 14b, 17b of the tab laminate 21, 25.
  • the joint strength between the current collector plates 16 and 19 and the welded portion W is increased. Further, since the outer surface Ws of the welded portion W is inclined with respect to the stacking direction of the tab laminates 21 and 25 so as to go outward as the current collector plates 16 and 19 are approached, for example, the tab laminate 21 or Even when an external force is applied to 25, the tab laminates 21, 25 are difficult to peel from the current collector plates 16, 19.
  • the tab laminate When the current collector plates 16 and 19 protrude outward from the end surfaces 21a, 21b, 25a, and 25b of the tab laminates 21 and 25 in the cross section of the tab laminates 21 and 25 (for example, the YZ cross section), the tab laminate The inclination angle of the outer surface Ws of the welded portion W with respect to the stacking direction of 21 and 25 can be increased. As a result, the rate of increase in the cross-sectional area of the welded portion W increases in the stacking direction of the tab laminates 21 and 25.
  • the welded portion W is formed, the molten material easily moves outward from the end surfaces 21a, 21b, 25a, 25b along the surfaces of the current collector plates 16, 19 due to, for example, at least one of gravity and surface tension. Therefore, the inclination angle of the outer surface Ws of the welded portion W increases.
  • the heat generated in the welded portion W is easily transferred to the electrode bodies 40 and 42. It is easy to influence. Even in such a case, in the electrode assembly 3, the current collector plates 16 and 19 are located near the tabs 14b and 17b where the distance between the electrode main bodies 40 and 42 and the welded portion W is short. The heat generated in the weld W is transmitted to the current collector plates 16 and 19 before the electrode bodies 40 and 42. As a result, it is difficult for heat to be transmitted from the welded portion W to the electrode bodies 40 and 42 via the tabs 14b and 17b.
  • the positional deviation between the tabs 17b is often larger than the two end faces 25a and 25b arranged on the opposite sides of the tab laminated body 25 (see FIG. 3).
  • the positional deviation between the tabs 14b often increases on the end surface 21c.
  • the welded portion W in the direction orthogonal to the laminating direction of the tab laminated body 21 may be less than 2 mm, may be 1.5 mm or less, may be 1.2 mm or less, may be greater than 0.1 mm, It may be 3 mm or more.
  • the maximum welding depth Wd of the part W may be less than 2 mm, 1.5 mm or less, 1.2 mm or less, or more than 0.1 mm. 0.3 mm or more.
  • the maximum welding depth Wd is less than 2 mm, for example, the generation of sputtered particles due to the irradiation with the energy beam B can be suppressed.
  • the maximum welding depth Wd is 1.2 mm or less, the generation of sputtered particles is significantly suppressed (see FIG. 17).
  • the maximum area of the welded portion W is, for example, 4 to 40 mm 2 .
  • the maximum area of the welded portion W is, for example, 4 to 40 mm 2 .
  • the maximum length W2 of the welded portion W in the direction (eg, the X-axis direction) orthogonal to the stacking direction of the tab stacked body 21 on the end faces 21a and 21b of the tab stacked body 21 is When viewed from a direction (for example, the Y-axis direction) orthogonal to both the stacking direction (for example, the Z-axis direction) of the stacked body 21 and the direction (for example, the X-axis direction) orthogonal to the stacking direction of the tab stacked body 21 It is larger than the maximum length W1 of the portion where the welded portion W and the tab laminate 21 overlap in the lamination direction of the laminate 21 (for example, the Z-axis direction) (see FIG. 3).
  • the welded portion W spreads in a direction intersecting with the lamination direction of the tab laminated body 21.
  • the electrical resistance value between the plurality of tabs 14b can be reduced.
  • the mechanical strength of the welded portion W is increased, the welded portion W is not easily broken even if stress is generated in the electrode assembly 3 by, for example, an assembly operation or an external force.
  • the thermal diffusibility of the welded portion W is improved, the generation of sputtered particles due to the irradiation of the energy beam B can be suppressed when forming the welded portion W.
  • the maximum length W2 of the welded portion W in the direction (for example, the X-axis direction) orthogonal to the stacking direction of the tab stacked body 25 on the end surfaces 25a and 25b of the tab stacked body 25 is the stacking direction of the tab stacked body 25 (for example, When viewed from a direction (for example, the Y-axis direction) orthogonal to both the Z-axis direction) and a direction (for example, the X-axis direction) orthogonal to the stack direction of the tab stack 25, the stack direction of the tab stack 25 (for example, It is larger than the maximum length W1 of the portion where the welded portion W and the tab laminate 25 overlap in the Z-axis direction).
  • the welded portion W spreads in a direction intersecting with the lamination direction of the tab laminated body 25.
  • the electrical resistance value between the plurality of tabs 17b can be reduced.
  • the mechanical strength of the welded portion W is increased, the welded portion W is not easily broken even if stress is generated in the electrode assembly 3 by, for example, an assembly operation or an external force.
  • the thermal diffusibility of the welded portion W is improved, the generation of sputtered particles due to the irradiation of the energy beam B can be suppressed when forming the welded portion W.
  • the tab laminated body 21 is disposed between the protective plate 23 and the current collector plate 16 in the lamination direction of the tab laminated body 21, and the thickness of the protective plate 23 in the lamination direction of the tab laminated body 21 is the lamination of the tab laminated body 21. It may be smaller than the thickness of the current collector plate 16 in the direction. In this case, since the thickness of the protective plate 23 is relatively small, the difference between the heat capacity of the protective plate 23 and the heat capacity of the tab 14b can be reduced. Therefore, the quality of the welding part W in the contact location of the protection plate 23 and the tab 14b improves.
  • the thickness of the protective plate 23 in the stacking direction of the tab laminate 21 may be larger than the thickness of the tab 14 b in the stacking direction of the tab laminate 21.
  • the thickness of the protective plate 23 may be 0.1 to 0.5 mm or 0.1 to 0.2 mm. If the thickness of the protective plate 23 is less than 0.1 mm, the force with which the protective plate 23 presses the tab 14b becomes small, and thus the tab 14b tends to move during welding. If the thickness of the protective plate 23 is more than 0.5 mm, the energy for melting the protective plate 23 during welding tends to increase. When the output of the energy beam B is increased to increase the energy, sputtered particles due to the irradiation of the energy beam B are likely to be generated.
  • the thickness of the tab 14b is, for example, 5 to 30 ⁇ m.
  • the thickness of the tab laminate 21 may be, for example, 0.3 to 2.4 mm, or 0.6 to 1.0 mm.
  • the tab laminated body 25 is disposed between the protective plate 27 and the current collector plate 19 in the laminating direction of the tab laminated body 25, and the thickness of the protective plate 27 in the laminating direction of the tab laminated body 25 is determined by the tab laminated body. It may be smaller than the thickness of the current collector plate 19 in the 25 stacking direction. In this case, since the thickness of the protection plate 27 is relatively small, the difference between the heat capacity of the protection plate 27 and the heat capacity of the tab 17b can be reduced. Therefore, the quality of the welding part W in the contact location of the protection board 27 and the tab 17b improves.
  • the thickness of the protection plate 27 in the stacking direction of the tab laminate 25 may be larger than the thickness of the tab 17b in the stacking direction of the tab stack 25.
  • the thickness of the protective plate 27 may be, for example, 0.1 to 0.5 mm or 0.1 to 0.2 mm. When the thickness of the protection plate 27 is less than 0.1 mm, the force with which the protection plate 27 presses the tab 17b is reduced, and thus the tab 17b tends to move during welding. If the thickness of the protective plate 27 is more than 0.5 mm, the energy for melting the protective plate 27 during welding tends to increase. When the output of the energy beam B is increased to increase the energy, sputtered particles due to the irradiation of the energy beam B are likely to be generated. The thickness of the tab 17b is, for example, 5 to 30 ⁇ m. The thickness of the tab laminate 25 may be, for example, 0.3 to 2.4 mm, or 0.6 to 1.0 mm.
  • FIGS. 6 to 11 are views showing one process of the method for manufacturing the power storage device according to the first embodiment.
  • the power storage device 1 shown in FIGS. 1 and 2 is manufactured by, for example, the following method.
  • FIG. 6 is a diagram showing the lid 2b and the current collector plates 16 and 19 seen from the X-axis direction
  • FIG. 6B shows the lid 2b and the current collector 19 seen from the Y-axis direction.
  • An insulating member 28 having a plurality of holes for allowing the positive electrode terminal 5 and the negative electrode terminal 6 to pass through can be disposed between the lid portion 2 b and the current collector plates 16 and 19.
  • FIG. 7 the tab laminates 21 and 25 are disposed on the current collector plates 16 and 19, respectively.
  • FIG. 7A is a diagram showing the tab laminates 21 and 25 viewed from the X-axis direction
  • FIG. 7B is a diagram showing the tab laminate 25 viewed from the Y-axis direction.
  • the protective plates 23 and 27 may be placed on the tab laminates 21 and 25, respectively.
  • the tab laminates 21 and 25 are pressed through the protective plates 23 and 27 by a jig, for example, but may not be pressed.
  • the energy beam is applied to the end surface 25a of the tab laminate 25 in a state where the tab laminates 21 and 25 are respectively disposed on the current collector plates 16 and 19 fixed to the lid portion 2b.
  • B is irradiated.
  • 8A is a diagram showing the tab laminates 21 and 25 viewed from the X-axis direction
  • FIG. 8B is a diagram showing the tab laminate 25 viewed from the Y-axis direction.
  • the energy beam B is irradiated from the irradiation device 30 toward the end surface 25a of the tab laminate 25.
  • the irradiation device 30 is a scanner head including a lens and a galvanometer mirror, for example.
  • a beam generator is connected to the scanner head via a fiber.
  • the irradiating device 30 may be composed of a diffractive optical system such as a refractive type such as a prism or a diffractive optical element (DOE).
  • DOE diffractive optical element
  • a direction J in which the irradiation direction of the energy beam B is projected onto a plane (for example, YZ plane) orthogonal to the end surface 25a of the tab stack 25 and including the stacking direction of the tab stack 25 is Z in the plane (for example, YZ plane).
  • the direction J is also inclined with respect to the end face 25 a of the tab laminate 25.
  • the smaller angle ⁇ among the angles formed by the direction H and the direction J may be 5 to 85 °, 10 to 80 °, or 45 to 75 °. Good.
  • the direction J may be parallel to the direction H.
  • the energy beam B is a high energy beam that can be welded.
  • the energy beam B is, for example, a laser beam or an electron beam.
  • the irradiation with the energy beam B is performed in an atmosphere of an inert gas G supplied from the nozzle 32.
  • the energy beam B is irradiated to the end surface 25a of the tab laminated body 25 in a state where the tab laminated body 25 is pressed in the Z-axis direction via the current collector plate 19 and the protective plate 27 by a jig, for example.
  • the work including the current collecting plates 16 and 19, the tab laminates 21 and 25, and the protection plates 23 and 27 is placed on a transport stage such as a belt conveyor, and is transported in the Y-axis direction to the irradiation position of the energy beam B.
  • a transport stage such as a belt conveyor
  • the energy beam B can be scanned along the direction (X-axis direction) intersecting the Z-axis direction on the end face 25a of the tab laminate 25.
  • scanning is performed along the X-axis direction while displacing the energy beam B in the Z-axis direction.
  • the energy beam B is scanned along the X-axis direction while being reciprocally displaced (wobbled) in the Z-axis direction.
  • the amount of displacement of the irradiation spot of the energy beam B in the Z-axis direction is larger than the thickness of the tab laminate 25.
  • the irradiation spot of the energy beam B moves from the position P1 on the axis H1 along the X-axis direction to the position P2 on the end face 25a of the tab laminate 25.
  • the positions P1 and P2 are located at the center of the end face 25a of the tab laminate 25 in the Z-axis direction.
  • the energy beam B is scanned while moving the center point along the X-axis direction on the end face 25a of the tab laminate 25 and rotating the irradiation spot of the energy beam B around the center point on the XZ plane. It is preferable that the diameter of rotation is larger than the thickness of the tab laminate 25 because the end face 25a, the current collector plate 19 and the protective plate 27 of the tab laminate 25 can be welded as a whole.
  • FIG. 9A is a diagram showing the tab laminates 21 and 25 viewed from the X-axis direction
  • FIG. 9B is a diagram showing the tab laminate 25 viewed from the Y-axis direction.
  • the energy beam B is similarly applied to the end face 21 b of the tab laminated body 21.
  • the welded portion W is also formed from the end surface 21 b of the tab laminated body 21 to the inside.
  • the energy beam B is applied to the end face 21b in a state where the end face 25b of the tab laminated body 25 and the end face 21b of the tab laminated body 21 are arranged to face each other.
  • the welded portion W is formed on the inner side from the end face 25b of the tab laminated body 25 by irradiating the end surface 25b of the tab laminated body 25 with the energy beam B (FIG. 4). reference).
  • the energy beam B is applied to the end face 25b in a state where the end face 25b of the tab laminated body 25 and the end face 21b of the tab laminated body 21 are arranged to face each other.
  • the end surface 21a of the tab laminated body 21 is irradiated with the energy beam B, thereby forming a welded portion W from the end surface 21a of the tab laminated body 21 (see FIG. 4). ).
  • the workpiece including the tab stacked bodies 21 and 25 is transferred in the Y-axis direction to the irradiation position of the energy beam B by the transfer stage.
  • the end surfaces 21a and 25b of the tab laminates 21 and 25 are irradiated with the energy beam B using the first irradiation device 30, and the end surfaces 21b and 25a of the tab laminates 21 and 25 are used using the second irradiation device 30. May be irradiated with the energy beam B.
  • the end surfaces 25a, 21b, 25b, and 21a may be sequentially irradiated with the energy beam B by moving one irradiation device 30 with a driving device such as a motor to change the irradiation direction of the energy beam B.
  • a driving device such as a motor to change the irradiation direction of the energy beam B.
  • the power storage device 1 is manufactured through the above steps.
  • the current collecting plates 16 and 19 may be flat plates that are not bent. That is, current collector plates 16 and 19 may be flat plates that are not bent from the start to the end of manufacture of power storage device 1.
  • a bent current collector plate is used to separate the region fixed to the lid and the region to be resistance welded.
  • the method for manufacturing the power storage device 1 since the welded portion W is formed by irradiation with the energy beam B, welding can be performed even if flat plates that are not bent are used as the current collector plates 16 and 19. As a result, the degree of freedom in designing the power storage device 1 is increased.
  • the current collecting plates 16 and 19 are not flat plates that are not bent, but may be bent flat plates.
  • FIG. 12 to FIG. 13 are views showing one process of the manufacturing method of the electrode assembly according to the second embodiment.
  • 12A and 13A are views showing the tab laminates 21 and 25 viewed from the X-axis direction
  • FIGS. 12B and 13B are tab stacks viewed from the Y-axis direction.
  • the electrical storage apparatus 1 can be manufactured similarly to 1st Embodiment except the welding part W being formed in the end surfaces 21c and 25c (1st end surface) of the tab laminated bodies 21 and 25, respectively. it can.
  • the end surface 25c of the tab laminated body 25 is located at the tip of the tab laminated body 25 and is a surface along the YZ plane.
  • the end face 25c may be formed by cutting the tip end of the tab laminate 25, or may be formed by laminating the tab 17b using tabs 17b having different lengths.
  • the direction J in which the irradiation direction of the energy beam B is projected onto a plane (for example, XZ plane) that is orthogonal to the end surface 25c of the tab laminate 25 and includes the lamination direction of the tab laminate 25 is the plane.
  • a plane for example, XZ plane
  • the direction J is also inclined with respect to the end face 25 c of the tab laminate 25.
  • the energy beam B is scanned along the Y-axis direction while being displaced (wobbling) in the Z-axis direction on the end face 25c.
  • the irradiation spot of the energy beam B moves from the position P4 on the axis H1 along the Y-axis direction to the position P5 on the end face 25c.
  • the positions P4 and P5 are located at the center of the end face 25c in the Z-axis direction.
  • the energy beam B is scanned while moving the center point along the Y-axis direction on the end face 25c and rotating the irradiation spot of the energy beam B around the center point on the YZ plane.
  • the welded portion W is formed on the inner side from the end surface 25 c of the tab laminated body 25 by the irradiation of the energy beam B.
  • the cross-sectional area of the welded portion W in a plane (for example, the XY plane) orthogonal to the stacking direction (for example, the Z-axis direction) of the tab stack 25 extends over the thickness of the tab stack 25. As it approaches the current collector plate 19, it monotonously increases.
  • the current collector 19 may protrude outward from the end face 25c of the tab laminated body 25, but is positioned inside the end face 25c of the tab laminated body 25. Also good.
  • the welded portion W is also formed on the end surface 21c of the tab laminated body 21.
  • the same effects as those in the first embodiment can be obtained.
  • the welding part W is formed also in the end surface 25c in addition to the end surfaces 25a and 25b of the tab laminated body 25, the electrical resistance value between the tabs 17b can be reduced.
  • the electrical resistance value between the tabs 14b can also be reduced.
  • the welded portion W may not be formed on the end surfaces 21a, 21b, 25a, and 25b of the tab laminates 21 and 25, and the welded portion W may be formed only on the end surfaces 21c and 25c of the tab laminates 21 and 25.
  • FIG. 14 to FIG. 15 are diagrams showing one process of the method for manufacturing the electrode assembly according to the third embodiment.
  • 14A and 15A are views showing the tab laminate 25 viewed from the X-axis direction
  • FIGS. 14B and 15B are tab laminates 25 viewed from the Y-axis direction.
  • the electrode assembly 3 can be manufactured in the same manner as in the first embodiment, except that the wound electrode assembly 3 is manufactured instead of the stacked electrode assembly 3.
  • the wound electrode assembly 3 includes tab laminates 21 and 25, similar to the stacked electrode assembly 3.
  • the tab laminates 21 and 25 are disposed on opposite sides in the X-axis direction.
  • the tab laminate 25 is wound around the axis in the X-axis direction and then compressed in the Z-axis direction. Therefore, the tab laminate 25 includes tabs 17b that are laminated in the Z-axis direction. Specifically, a plurality of portions in the tab 17b are stacked in the Z-axis direction.
  • the welded portion W connects the stacked tabs 17b. Specifically, a plurality of portions in the tab 17b are connected by the welded portion W.
  • the tab laminate 25 does not include the end surfaces 25a and 25b, but includes only the end surface 25c located at the tip.
  • the tab laminate 21 does not include the end surfaces 21a and 21b, but includes only the end surface 21c located at the tip.
  • the energy beam B is applied to the end face 25 c of the tab laminate 25 as in the second embodiment.
  • the welded portion W is formed on the inner side from the end surface 25 c of the tab laminated body 25 by the irradiation of the energy beam B.
  • the welded portion W is also formed on the end surface 21c of the tab laminated body 21.
  • FIG. 16 is a view showing a part of an electrode assembly having a weld according to a modification.
  • FIG. 16A is a diagram showing a tab laminate 25 as viewed from the Y-axis direction, which has a welded portion W according to a first modification.
  • FIG. 16B is a view showing the tab laminate 25 having the welded portion W according to the second modified example as seen from the Y-axis direction.
  • the welded portion W when viewed from the normal direction of the end face 25a of the tab laminate 25, the welded portion W has an outer shape including a curve. For this reason, the stress is difficult to concentrate on the curved portion of the outer shape of the welded portion W, so that the welded portion W is difficult to peel off.
  • the welded portion W may have an outer shape surrounded by a curve, or may have an outer shape surrounded by a curve and a straight line.
  • the outer shape of the welded portion W does not include a corner portion (a portion where straight lines intersect) where stress is likely to concentrate.
  • the outer shape of the welded portion W according to the first modification includes, for example, a part of an ellipse.
  • the maximum length W2 of the welded portion W in the direction (X-axis direction) orthogonal to the stacking direction of the tab stacked body 25 on the end surface 25a of the tab stacked body 25 is the tab stacked body 25.
  • the outer shape of the welded portion W according to the second modification includes, for example, a part of a circle.
  • the maximum length W2 of the welded portion W in the direction (X-axis direction) orthogonal to the stacking direction of the tab stack 25 on the end surface 25a of the tab stack 25 is the tab stack 25.
  • the maximum length W2 may be equal to or less than the maximum length W1.
  • the welded portion W has the same shape as the welded portion W according to the first modified example or the second modified example. May be.
  • Example 1 The welded portion W was formed so that the maximum weld depth Wd of the welded portion W was 0.1 mm.
  • Example 2 A weld W was formed in the same manner as in Example 1 except that the maximum weld depth Wd of the weld W was 0.3 mm.
  • Example 3 A weld W was formed in the same manner as in Example 1 except that the maximum weld depth Wd of the weld W was 1.2 mm.
  • the power of the laser used for forming the weld W was 1500 W, and the scanning speed was 24.9 mm / sec.
  • Example 4 A weld W was formed in the same manner as in Example 1 except that the maximum weld depth Wd of the weld W was 1.5 mm.
  • the output of the laser used for forming the weld W was 1500 W, and the scanning speed was 8.3 mm / sec.
  • Example 5 A welded portion W was formed in the same manner as in Example 1 except that the maximum weld depth Wd of the welded portion W was 2 mm.

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  • Microelectronics & Electronic Packaging (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)

Abstract

Selon l'invention, un ensemble d'électrode équipé d'une électrode contenant une languette, est équipé : d'un collecteur, et d'un stratifié de languettes possédant des languettes stratifiées. Le stratifié de languettes est disposé sur le collecteur dans la direction de stratification du stratifié de languettes. Le stratifié de languettes possède une partie soudage qui est positionnée côté interne à partir d'une première face extrémité du stratifié de languettes se prolongeant suivant la direction de stratification du stratifié de languettes. La surface transversale de la partie soudage dans un plan perpendiculaire à la direction de stratification du stratifié de languettes, augmente de manière monotone en s'approchant du collecteur, dans l'épaisseur du stratifié de languettes. Une face externe de la partie soudage est inclinée dans la direction de stratification du stratifié de languettes de manière à s'orienter vers un côté externe en s'approchant du collecteur, dans un plan transversal du stratifié de languettes incluant la direction de stratification du stratifié de languettes et perpendiculaire à la première face extrémité du stratifié de languettes.
PCT/JP2016/082108 2015-12-21 2016-10-28 Ensemble d'électrode, et procédé de fabrication de dispositif de stockage WO2017110246A1 (fr)

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JP2019175784A (ja) * 2018-03-29 2019-10-10 三洋電機株式会社 蓄電装置
CN113437445A (zh) * 2020-03-23 2021-09-24 本田技研工业株式会社 锂离子二次电池
WO2022042492A1 (fr) * 2020-08-31 2022-03-03 比亚迪股份有限公司 Batterie et bloc-batterie
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WO2022172619A1 (fr) * 2021-02-15 2022-08-18 パナソニックＩｐマネジメント株式会社 Batterie, et procédé de fabrication de celle-ci

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