WO2023058778A1 - Batterie et procédé de fabrication de batterie - Google Patents

Batterie et procédé de fabrication de batterie Download PDF

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Publication number
WO2023058778A1
WO2023058778A1 PCT/JP2022/037869 JP2022037869W WO2023058778A1 WO 2023058778 A1 WO2023058778 A1 WO 2023058778A1 JP 2022037869 W JP2022037869 W JP 2022037869W WO 2023058778 A1 WO2023058778 A1 WO 2023058778A1
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WO
WIPO (PCT)
Prior art keywords
positive electrode
current collector
negative electrode
battery
electrode tab
Prior art date
Application number
PCT/JP2022/037869
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English (en)
Japanese (ja)
Inventor
博昭 江川
Original Assignee
ビークルエナジージャパン株式会社
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Filing date
Publication date
Application filed by ビークルエナジージャパン株式会社 filed Critical ビークルエナジージャパン株式会社
Publication of WO2023058778A1 publication Critical patent/WO2023058778A1/fr

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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
    • H01M50/531—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
    • H01M50/534—Electrode connections inside a battery casing characterised by the material 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

  • the present invention relates to a battery and a method for manufacturing a battery.
  • the battery of the present invention includes a first current collector, a charge/discharge body including an electrode tab laminated with the first current collector, and the electrode tab laminated with the electrode tab, and a second current collector having a larger heat capacity than the electrode tab.
  • the first current collector, the electrode tabs and the second current collector are welded together.
  • the method for manufacturing a battery of the present invention includes: a first current collector; a charge/discharge body including an electrode tab laminated with the first current collector; and a second current collector laminated with a tab and having a larger heat capacity than the electrode tab.
  • the battery manufacturing method includes a step of welding the first current collector, the electrode tab and the second current collector.
  • the electrode tab of the charge/discharge body and the current collector can be sufficiently joined. Further, according to the battery manufacturing method of the present invention, defective welding between the electrode tab of the charge/discharge body and the current collector can be suppressed, and the productivity and yield of the battery can be improved.
  • FIG. 2 is a perspective view showing the battery 1 of the first embodiment;
  • FIG. 2 is a cross-sectional perspective view showing the periphery of the negative electrode terminal 42 of the battery 1 of the first embodiment.
  • FIG. 2 is a cross-sectional view showing the periphery of the negative electrode terminal 42 of the battery 1 of the first embodiment;
  • FIG. 2 is a cross-sectional perspective view showing the periphery of the positive electrode terminal 41 of the battery 1 of the first embodiment.
  • FIG. 2 is a cross-sectional view showing the periphery of the positive electrode terminal 41 of the battery 1 of the first embodiment;
  • 2 is an exploded perspective view showing the battery 1 of the first embodiment;
  • FIG. 2 is a perspective view showing the charge/discharge body 10 of the battery 1 of the first embodiment, and showing a portion of the charge/discharge body 10 including a positive electrode tab 11b and a negative electrode tab 12b extracted from the charge/discharge body 10 and shown below.
  • FIG. 2 is a cross-sectional view showing a part of the charge/discharge body 10 of the battery 1 of the first embodiment; Sectional drawing which shows a part of charging/discharging body 110 of the modification of the battery 1 of 1st Embodiment.
  • 3 is a perspective view showing the periphery of a negative electrode current collector plate 22 of the battery 1 of the first embodiment; FIG.
  • FIG. 3 is a perspective view showing the periphery of a positive electrode current collector plate 21 of the battery 1 of the first embodiment
  • FIG. FIG. 2 is a cross-sectional view showing the periphery of the positive electrode current collector plate 21 of the battery 1 of the first embodiment
  • 4 is an exploded perspective view showing the periphery of a negative electrode terminal 42 of the battery 1 of the first embodiment
  • FIG. 4 is an exploded perspective view showing a lid 52 and a sealing plug 53 of the battery 1 of the first embodiment
  • FIG. 2 is an exploded perspective view showing the periphery of a positive electrode terminal 41 of the battery 1 of the first embodiment
  • FIG. 3 is a perspective view showing a negative electrode current collector plate 22, a negative electrode tab 12b, a negative electrode ribbon 24, and the like in manufacturing the battery 1 of the first embodiment;
  • FIG. 3 is a perspective view showing a state in which a negative electrode collector plate 22, a negative electrode tab 12b, and a negative electrode ribbon 24 are stacked in manufacturing the battery 1 of the first embodiment.
  • FIG. 3 is a perspective view showing a state in which the negative electrode collector plate 22, the negative electrode tab 12b, and the negative electrode ribbon 24 are laser-welded in manufacturing the battery 1 of the first embodiment.
  • the perspective view which shows a part of battery 2 of 2nd Embodiment.
  • FIG. 10 is a perspective view showing the periphery of the negative electrode current collector plate 22, the negative electrode tab 212b, and the negative electrode ribbon 24 of the battery 2 of the second embodiment.
  • FIG. 11 is a perspective view showing the periphery of the negative electrode current collector plate 22, the negative electrode tab 312b, and the negative electrode ribbon 24 of the battery 3 of the third embodiment;
  • FIG. 12 is a perspective view showing the periphery of the negative electrode current collector plate 122, the negative electrode tab 412b, and the negative electrode ribbon 24 of the battery 4 of the fourth embodiment.
  • FIG. 11 is a perspective view showing the periphery of a negative electrode current collector plate 222 of the battery 5 of the fifth embodiment
  • FIG. 12 is a perspective view showing the periphery of a positive electrode current collector plate 221 of the battery 5 of the fifth embodiment
  • FIG. 11 is a cross-sectional view showing the periphery of a positive electrode current collector plate 221 of the battery 5 of the fifth embodiment
  • FIG. 11 is a perspective view showing a negative electrode junction portion 222f of a negative electrode current collector plate 222, a negative electrode tab 12b, a negative electrode ribbon 24, and the like in manufacturing the battery 5 of the fifth embodiment
  • FIG. 11 is a perspective view showing a state in which a negative electrode junction portion 222f of a negative electrode current collector plate 222, a negative electrode tab 12b, and a negative electrode ribbon 24 are stacked in manufacturing the battery 5 of the fifth embodiment;
  • FIG. 11 is a perspective view showing a state in which a negative electrode junction portion 222f of a negative electrode current collector plate 222, a negative electrode tab 12b, and a negative electrode ribbon 24 are laser-welded in manufacturing the battery 5 of the fifth embodiment;
  • FIG. 11 is a cross-sectional view showing a positive electrode junction portion 223f of a positive current collector plate 223 of a battery 5 of Modification 1 of the fifth embodiment;
  • FIG. 11 is a cross-sectional view showing a positive electrode junction portion 224f of a positive current collector plate 224 of a battery 5 of Modification 2 of the fifth embodiment;
  • FIG. 11 is a cross-sectional view showing a positive electrode junction portion 225f of a positive current collector plate 225 of a battery 5 of Modification 3 of the fifth embodiment;
  • FIG. 12 is a perspective view showing the periphery of the negative electrode current collector plate 222, the negative electrode tab 212b (312b), and the negative electrode ribbon 24 of the battery 6 of the sixth embodiment.
  • FIG. 12 is a perspective view showing the periphery of the negative electrode current collector plate 322, the negative electrode tab 412b, and the negative electrode ribbon 24 of the battery 7 of the seventh embodiment;
  • FIGS. 20, 22 and 24 are shown reduced in number as compared to the corresponding electrode tabs shown in FIGS. 19, 21 and 23 .
  • the electrode tabs shown in FIGS. 34 and 35 are also shown in reduced numbers.
  • the same reference numerals are assigned to the same components, and overlapping descriptions are omitted.
  • a left-handed XYZ orthogonal coordinate system having X, Y, and Z axes as coordinate axes is used.
  • the arrows on each of the X-axis, Y-axis, and Z-axis indicate the positive directions of the coordinate axes.
  • the X-axis is the coordinate axis in the longitudinal direction of the rectangular parallelepiped battery.
  • the Y-axis is the coordinate axis in the lateral direction of the battery.
  • the Z-axis is the coordinate axis in the height direction of the battery.
  • a plane formed by the X and Y axes is called an XY plane
  • a plane formed by the Y and Z axes is called a YZ plane
  • a plane formed by the X and Z axes is called an XZ plane.
  • the positional relationship represented by the XYZ orthogonal coordinate system is merely a relative positional relationship.
  • the battery 1 includes a charge/discharge body 10 that charges and discharges electricity, a current collector 20 connected to the charge/discharge body 10, and a current interrupter 30 connected to the current collector 20. , an external terminal 40 connected to the current collector 20 or the current interrupter 30, and an exterior body 50 in which constituent members of the battery 1 are accommodated or attached.
  • the battery 1 also includes an insulator 60 that insulates the components of the battery 1 and the exterior body 50 , and a sealing body 70 that seals the components of the battery 1 and the exterior body 50 .
  • the charge/discharge body 10 charges and discharges electricity.
  • a charge/discharge body 10 shown in FIGS. 2 to 8 includes a positive electrode 11, a negative electrode 12, a separator 13 (insulating member), and an electrolyte .
  • the electrodes (positive electrode 11 and negative electrode 12) are provided with electrode tabs (positive electrode tab 11b and negative electrode tab 12b).
  • the charge/discharge body 10 is formed by winding a component member in which a positive electrode 11, a separator 13, a negative electrode 12, and a separator 13 are laminated in this order and wound into a rectangular parallelepiped shape.
  • the positive electrode 11 includes, for example, as shown in FIGS. 7 and 8, an elongated positive electrode current collecting layer 11S and a positive electrode active material layer 11T joined to the positive electrode current collecting layer 11S.
  • the positive electrode current collecting layer 11S includes a current collecting portion 11a and a positive electrode tab 11b.
  • a positive electrode active material layer 11T is joined to the current collecting portion 11a.
  • the positive electrode active material layer 11T faces, for example, the entire region of the current collecting portion 11a along the lateral direction (Z-axis direction).
  • the positive electrode tab 11b protrudes in the lateral direction of the current collector 11a from the side edge 11c along the longitudinal direction of the current collector 11a.
  • the positive electrode tab 11b is formed integrally with the current collecting portion 11a.
  • One positive electrode tab 11b is formed in one collector portion 11a.
  • the current collector 11a is made of, for example, aluminum or an aluminum alloy.
  • the positive electrode active material layer 11T contains a positive electrode active material composed of a lithium-containing composite oxide, a binder, a conductive aid, and the like. Lithium (Li) and metal elements such as nickel (Ni), cobalt (Co), manganese (Mn), and lithium (Li) are used for lithium-containing composite oxides.
  • the negative electrode 12 includes, for example, as shown in FIGS. 7 and 8, a long negative electrode current collecting layer 12S and a negative electrode active material layer 12T joined to the negative electrode current collecting layer 12S.
  • the negative electrode current collecting layer 12S includes a current collecting portion 12a and a negative electrode tab 12b.
  • the collector portion 12 a of the negative electrode 12 has a longer width in the lateral direction (Z-axis direction) than the collector portion 11 a of the positive electrode 11 . Both ends of the current collecting portion 11 a of the positive electrode 11 along the short direction are positioned within the range along the short direction of the current collecting portion 12 a of the negative electrode 12 with the separator 13 interposed therebetween.
  • a negative electrode active material layer 12T is joined to the current collector 12a.
  • the negative electrode active material layer 12T faces, for example, the entire region of the current collector 12a along the width direction.
  • the negative electrode tab 12b protrudes in the lateral direction of the current collector 12a from the side edge 12c along the longitudinal direction of the current collector 12a.
  • the negative electrode tab 12b protrudes in the same direction as the positive electrode tab 11b of the positive electrode 11 when stacked on the positive electrode 11 with the separator 13 interposed therebetween.
  • the negative electrode tab 12b is separated from the positive electrode tab 11b of the positive electrode 11 in the state of being laminated with the positive electrode 11 with the separator 13 interposed therebetween.
  • the negative electrode tab 12b is formed integrally with the current collector 12a.
  • One negative electrode tab 12b is formed in one collector portion 12a.
  • the current collector 12a is made of, for example, copper or a copper alloy.
  • the negative electrode active material layer 12T contains a negative electrode active material made of a carbon-based material, a binder, a conductive aid, and the like. Graphite, for example, is used as the carbon-based material.
  • the separator 13 (insulator) allows lithium ions to pass through while providing insulation between the positive electrode 11 and the negative electrode 12, for example, as shown in FIGS.
  • the separator 13 is formed in an elongated shape.
  • the separator 13 has a longer width along the lateral direction (Z-axis direction) than the collector portion 11 a of the positive electrode 11 and the collector portion 12 a of the negative electrode 12 .
  • Both ends of the current collecting portion 11a of the positive electrode 11 along the short direction are located within the range along the short direction of the separator 13, and both ends of the current collecting portion 12a of the negative electrode 12 along the short direction are located within the range along the short direction of the separator 13.
  • the separator 13 is made of a porous material.
  • Polyethylene PolyEthylene
  • PP Polypropylene
  • a heat-resistant insulating member may be used instead of the separator 13 . Ceramics, for example, is used for the heat-resistant insulating member. Such a configuration is a so-called separatorless configuration.
  • the electrolyte 14 corresponds to a so-called electrolytic solution.
  • the electrolyte 14 contains an organic solvent, a supporting salt, and additives.
  • carbonic acid ester is used as the organic solvent.
  • Lithium salt is used as the supporting salt, for example.
  • a charge/discharge body 110 which is a modification of the charge/discharge body 10, will be described with reference to FIG.
  • the configuration of the positive electrode 111 is different from the configuration of the positive electrode 11 of the first embodiment.
  • the same reference numerals are given to the same configurations as those of the charge/discharge body 10, and the description thereof is omitted.
  • the positive electrode active material layer 111T of the charge/discharge body 110 faces a portion of the current collector 11a excluding both ends along the short direction (Z-axis direction).
  • a heat-resistant insulating layer 111U of the charge/discharge body 110 is joined to both ends of the collector portion 11a along the width direction and to the base end portion of the positive electrode tab 11b.
  • the heat-resistant insulating layer 111U contains, for example, ceramics.
  • the current collector 20 is connected to the positive electrode tab 11b and the negative electrode tab 12b of the charge/discharge body 10 .
  • the current collector 20 shown in FIGS. 2 to 5, 10 to 13 and 15 includes a positive electrode current collector 21 (first current collector), a negative electrode current collector 22 (first current collector), and a positive electrode ribbon. 23 (second current collector), and negative electrode ribbon 24 (second current collector).
  • the positive electrode current collector plate 21 (first current collector), for example, as shown in FIGS.
  • the positive electrode current collector plate 21 includes a rectangular plate-shaped first base portion 21 a, a rectangular parallelepiped plate-shaped second base portion 21 b, and the first base portion 21 a and the second base portion 21 b arranged stepwise. It includes a connecting portion 21c that connects to the , with different heights.
  • a concave portion 21d is formed in the upper surface of the second base portion 21b (the surface on the Z-axis positive direction side) by forming the second base portion 21b to be thin.
  • a fragile portion 21e which is a fragile portion recessed in a ring shape, is formed in the center of the recess 21d.
  • the first base portion 21a and the positive electrode tab 11b covered by the positive electrode ribbon 23 are laser-welded.
  • the positive collector plate 21 is made of, for example, aluminum or an aluminum alloy.
  • the negative electrode current collector plate 22 (first current collector) electrically connects the negative electrode tab 12b of the charge/discharge body 10 and the negative electrode terminal 42, for example, as shown in FIGS.
  • the negative electrode current collector plate 22 includes a rectangular parallelepiped plate-shaped base portion 22a and an insertion hole 22b passing through the base portion 22a.
  • the insertion portion 42 b of the negative electrode terminal 42 is inserted into the insertion hole 22 b of the negative electrode current collector plate 22 .
  • the base portion 22a and the negative electrode tab 12b covered by the negative electrode ribbon 24 are laser welded.
  • the negative electrode current collector plate 22 is made of, for example, copper or a copper alloy.
  • the positive electrode ribbon 23 (second current collector) is laminated on the positive electrode tab 11b so as to cover the positive electrode tab 11b, for example, as shown in FIGS. Laser welded.
  • the positive electrode ribbon 23 is formed in a rectangular shape along the lateral direction (X-axis direction) of the positive electrode tab 11b.
  • the positive electrode ribbon 23 is made of, for example, aluminum or an aluminum alloy.
  • the thickness of the positive electrode ribbon 23 along the stacking direction (Z-axis direction) is greater than that of the positive electrode tab 11b.
  • the positive electrode ribbon 23 is made of the same or similar material as that of the positive electrode tab 11b. Therefore, the specific heat of the positive electrode ribbon 23 is the same as or similar to the specific heat of the positive electrode tab 11b.
  • the similar material intends that the material of the main component is the same, but the additive is different in the material of the alloy. Therefore, the welded portion 23g of the positive electrode ribbon 23 has a larger heat capacity than the welded portion 11g of the positive electrode tab 11b.
  • the heat capacity is defined, for example, as the product (multiplied value) of specific heat and volume. Therefore, the positive electrode ribbon 23 is less likely to melt than the positive electrode tab 11b.
  • the thickness of the positive electrode ribbon 23 along the stacking direction is thinner than that of the positive electrode current collector plate 21 .
  • the positive electrode ribbon 23 is made of the same or similar material as the positive current collector plate 21 . Therefore, the specific heat of the positive electrode ribbon 23 is the same as or similar to the specific heat of the positive current collector plate 21 . Therefore, the welded portion 23 g of the positive electrode ribbon 23 has a smaller heat capacity than the welded portion 21 g of the positive electrode current collector plate 21 . Therefore, the positive electrode ribbon 23 melts more easily than the positive electrode current collector plate 21 .
  • the thickness of the positive electrode ribbon 23 along the stacking direction may be thicker than that of the positive electrode current collector plate 21 .
  • lamination refers to, for example, a state in which the positive electrode ribbon 23, the positive electrode tab 11b, and the positive electrode current collector plate 21 are in direct or indirect contact with each other over a certain area, and a part of the positive electrode ribbon 23 and the positive electrode It includes a state in which a part of the tab 11b and a part of the positive current collecting plate 21 are laminated.
  • the welded portion 23g of the positive electrode ribbon 23, the welded portion 11g of the positive electrode tab 11b, and the welded portion 21g of the positive current collector plate 21 are laser-welded.
  • the positive electrode ribbon 23 is laser-welded to the positive electrode tab 11b and the positive electrode current collector plate 21, the portion other than the welded portion 23g bends and hangs down in the negative direction of the Z axis due to its own weight.
  • the positive electrode tab 11b bends in the negative direction of the Z-axis due to its own weight and hangs down except for the welded portion 11g.
  • the positive electrode ribbon 23, the positive electrode tab 11b, and the positive electrode collector plate 21 are made of, for example, aluminum or an aluminum alloy. That is, the positive electrode ribbon 23, the positive electrode tab 11b, and the positive electrode collector plate 21 are made of the same or similar material.
  • the heat capacity is defined as the product (multiplied value) of the specific heat and the volume
  • the positive electrode ribbon 23 when laser welding is performed from the positive electrode ribbon 23 side, the positive electrode ribbon 23 functions as a cover layer to prevent the positive electrode tab 11b having a relatively lower heat capacity than the positive electrode ribbon 23 from evaporating.
  • the positive electrode current collector plate 21 when laser welding is performed from the side of the positive electrode current collector plate 21, the positive electrode current collector plate 21 is made to function as a cover layer to prevent the evaporation of the positive electrode tab 11b, which has a relatively lower heat capacity than the positive electrode current collector plate 21. To prevent.
  • the heat capacity of the welded portion 23g of the positive electrode ribbon 23 shown in the hatched portion and the gray portion in FIG. It is calculated based on the product of the area (XY plane) of the portion 23g and the thickness along the stacking direction (Y-axis direction).
  • the heat capacity of the welded portion 11g of the positive electrode tab 11b shown in the hatched portion and gray portion of FIG. It is calculated based on the product of the thicknesses.
  • the thickness of the welded portion 21g of the positive electrode current collector plate 21 is determined by measuring the positive electrode current collector plate 21 at a plurality of locations along the stacking direction, and distinguishing between portions where the welded portion 21g exists and portions where the welded portion 21g does not exist. Calculated.
  • heat capacities can be compared as follows. That is, for the positive electrode ribbon 23, the positive electrode tab 11b, and the positive electrode current collector plate 21, the heat capacities of the same area when viewed in the stacking direction are calculated and compared. For example, when viewing the positive electrode ribbon 23, the positive electrode tab 11b, and the positive electrode current collector plate 21 from the stacking direction, the heat capacities of the positive electrode tab 11b and the positive electrode current collector plate 21 existing in the region overlapping the positive electrode ribbon 23 are compared in the same area.
  • the area may be the area of the welded portion, or may be the area including the welded portion and the vicinity of the welded portion.
  • the welded portions of the positive electrode ribbon 23, the positive electrode tab 11b, and the positive electrode current collecting plate 21 are mixed with each other in the laminated state.
  • the specific heat of the positive electrode ribbon 23, the positive electrode tab 11b, and the positive electrode current collector plate 21 may be calculated based on the material near the welded portion of each member. That is, the material of the welded portion of each member and the material in the vicinity of the welded portion may be regarded as the same.
  • the specific heat may be calculated based on the material in the vicinity of each weld and not affected by the weld.
  • the heat capacity may be calculated based on the total area of the weld and the vicinity of the weld.
  • the negative electrode ribbon 24 (second current collector) is laminated with the negative electrode tab 12b so as to cover the negative electrode tab 12b, and laser-welded together with the negative electrode tab 12b and the negative electrode current collector plate 22, as shown in FIG. ing. That is, in a state in which the negative electrode tab 12b is laminated with the negative electrode current collector plate 22 and the negative electrode ribbon 24 is laminated with the negative electrode tab 12b, the negative electrode ribbon 24, the negative electrode tab 12b, and the positive electrode current collector plate 21 are laser-welded.
  • lamination refers to, for example, a state in which the negative electrode ribbon 24, the negative electrode tab 12b, and the negative electrode current collecting plate 22 are in direct or indirect contact with each other over a certain area, and a portion of the negative electrode ribbon 24 and the negative electrode are in contact with each other.
  • a state in which a portion of the tab 12b and a portion of the negative electrode current collector plate 22 are laminated is included.
  • the negative electrode ribbon 24 is formed in a rectangular shape along the lateral direction (X-axis direction) of the negative electrode tab 12b.
  • the negative electrode ribbon 24 is made of copper or a copper alloy, for example.
  • the thickness of the negative electrode ribbon 24 along the stacking direction (Z-axis direction) is greater than that of the negative electrode tab 12b.
  • the negative electrode ribbon 24 is made of the same or similar material as that of the negative electrode tab 12b. Therefore, the specific heat of the negative electrode ribbon 24 is the same as or similar to the specific heat of the negative electrode tab 12b.
  • the similar material intends that the material of the main component is the same, but the additive is different in the material of the alloy. Therefore, the welded portion of the negative electrode ribbon 24 has a larger heat capacity than the welded portion of the negative electrode tab 12b. Therefore, the negative electrode ribbon 24 is less likely to melt than the negative electrode tab 12b.
  • the thickness of the negative electrode ribbon 24 along the stacking direction is thinner than that of the negative electrode current collector plate 22 .
  • the negative electrode ribbon 24 is made of the same or similar material as the negative current collector plate 22 . Therefore, the specific heat of the negative electrode ribbon 24 is the same as or similar to the specific heat of the negative electrode current collector plate 22 . Therefore, the welded portion of the negative electrode ribbon 24 has a smaller heat capacity than the welded portion of the negative electrode current collector plate 22 . Therefore, the negative electrode ribbon 24 melts more easily than the negative electrode current collector plate 22 .
  • the thickness of the negative electrode ribbon 24 along the stacking direction may be thicker than that of the negative electrode current collector plate 22 .
  • the current interrupter 30 is connected to the current collector 20 and electrically connects the current collector 20 and the positive electrode terminal 41 .
  • the current interrupter 30 shown in FIGS. 4, 5 and 15 includes a diaphragm 31, a conducting member 32, and a pair of supports 33. As shown in FIG.
  • the diaphragm 31 includes a curved cylindrical body portion 31a, a disk-shaped first joint portion 31b provided on the tip side (Z-axis negative direction side) of the body portion 31a, and a body portion It includes a ring-shaped second joint portion 31c provided on the base end side (the Z-axis positive direction side) of 31a.
  • the first joint portion 31 b is joined to the recess 21 d of the positive collector plate 21 .
  • the second joint portion 31 c is joined to the conducting member 32 .
  • Diaphragm 31 is made of, for example, aluminum or an aluminum alloy.
  • the conducting member 32 is formed in a cylindrical shape, as shown in FIG. 15, for example.
  • the positive electrode side first insulating plate 62 is joined to the upper surface of the conducting member 32 (the surface on the Z-axis positive direction side).
  • a second joint portion 31c of the diaphragm 31 is joined to the peripheral edge of the lower surface of the conducting member 32 (the surface on the Z-axis negative direction side).
  • the conducting member 32 is made of, for example, aluminum or an aluminum alloy.
  • the support base 33 includes a rectangular main body portion 33a extending in the lateral direction (Y-axis direction) of the battery 1 and both sides of the main body portion 33a in the longitudinal direction (Y-axis direction). and a leg portion 33b extending downward (Z-axis negative direction).
  • One support base 33 is provided at each end of the diaphragm 31 along the longitudinal direction (X-axis direction) of the battery 1 .
  • the body portion 33 a is attached to the positive electrode side first insulating plate 62 .
  • the leg portion 33 b is attached to the second base portion 21 b of the positive electrode current collector plate 21 .
  • the support base 33 is made of, for example, insulating resin.
  • the external terminal 40 is connected to the current collector 20 or current interrupter 30 .
  • the external terminals 40 shown in FIGS. 1-6, 10-13 and 15 include a positive terminal 41 and a negative terminal 42 .
  • the positive terminal 41 is connected to the conducting member 32 of the current interrupter 30, as shown in FIG. 5, for example.
  • the positive electrode terminal 41 includes a rectangular plate-shaped base portion 41a, a cylindrical insertion portion 41b protruding downward (Z-axis negative direction) from the base portion 41a, and downward ( It includes a cylindrical joint portion 41c protruding in the Z-axis negative direction).
  • the base portion 41a is in contact with the base portion 64a of the positive electrode side second insulating plate 64, for example, as shown in FIG.
  • the insertion portion 41 b is inserted into the insertion hole 64 b of the second positive insulating plate 64 , the positive insertion hole 52 a of the lid 52 , the insertion hole 62 b of the first positive insulating plate 62 , and the insertion hole 32 b of the conducting member 32 . .
  • the joint portion 41c protrudes downward (Z-axis negative direction) from the insertion hole 32b of the conduction member 32 and is expanded radially outward to be joined to the conduction member 32.
  • the joint portion 41c is caulked around the periphery of the insertion hole 32b of the conducting member 32.
  • the joint portion 41 c is welded to the periphery of the insertion hole 32 b of the conducting member 32 .
  • the positive electrode terminal 41 is made of, for example, aluminum or an aluminum alloy.
  • the negative electrode terminal 42 is connected to the negative current collecting plate 22, for example, as shown in FIG.
  • the negative electrode terminal 42 includes a rectangular parallelepiped plate-shaped base portion 42a, a cylindrical insertion portion 42b protruding downward (Z-axis negative direction) from the base portion 42a, and downward from the periphery of the base portion 42a ( It includes a cylindrical joint portion 42c protruding in the Z-axis negative direction).
  • the base portion 42a is in contact with the base portion 65a of the negative electrode side second insulating plate 65, for example, as shown in FIG.
  • the insertion portion 42b is inserted into the insertion hole 65b of the negative electrode-side second insulating plate 65, the negative electrode-side insertion hole 52b of the lid 52, the insertion hole 63b of the negative electrode-side first insulating plate 63, and the insertion hole 22b of the negative current collector plate 22. ing.
  • the joint portion 42 c protrudes downward from the insertion hole 22 b of the negative electrode current collector plate 22 and is expanded radially outward to be joined to the negative electrode current collector plate 22 . That is, the joint portion 42 c is caulked around the periphery of the insertion hole 22 b of the negative electrode current collector plate 22 . Furthermore, the joint portion 42 c is welded to the periphery of the insertion hole 22 b of the negative electrode current collector plate 22 .
  • the negative electrode terminal 42 is made of, for example, copper or a copper alloy.
  • the components of the battery 1 are housed or attached to the exterior body 50 . 1 to 6, 10, 11, and 13 to 15 includes a container 51, a lid 52 and a sealing plug 53. As shown in FIGS.
  • the container 51 accommodates the charge/discharge body 10 and the like covered with an insulating cover 61, as shown in FIGS. 2 and 6, for example.
  • the container 51 is configured by a rectangular parallelepiped metal can.
  • the container 51 includes, for example, as shown in FIG. 6, an opening 51a opened along the longitudinal direction and a housing portion 51b connected to the opening 51a.
  • the container 51 is made of aluminum or an aluminum alloy, for example.
  • the lid 52 seals the opening 51a of the container 51, as shown in FIGS. 2 and 6, for example.
  • Lid 52 faces one side portion 10 a (side portion) of charge/discharge body 10 where positive electrode 11 , separator 13 , and negative electrode 12 are adjacent to each other.
  • the lid 52 is formed of a long plate-shaped metal plate.
  • the cover 52 has a positive electrode side insertion hole 52a formed by a circular through hole at one end in the longitudinal direction.
  • the insertion portion 41b of the positive electrode terminal 41 is inserted into the positive electrode side insertion hole 52a.
  • a negative electrode side insertion hole 52b configured by a circular through hole is formed in the lid 52 on the other end side in the longitudinal direction.
  • the insertion portion 42b of the negative electrode terminal 42 is inserted into the negative electrode side insertion hole 52b.
  • the lid 52 has an injection hole 52c formed by a circular through hole between the positive electrode side insertion hole 52a and the negative electrode side insertion hole 52b.
  • the electrolyte 14 is injected from the lid 52 toward the container 51 through the injection hole 52c.
  • the insertion portion 53b of the sealing plug 53 is inserted into the injection hole 52c.
  • the lid 52 has a split valve 52d formed in the center in the longitudinal direction. Lid 52 is welded to container 51 .
  • the lid 52 is made of aluminum or an aluminum alloy, for example.
  • the sealing plug 53 seals the injection hole 52c of the lid 52, for example, as shown in FIG.
  • the sealing plug 53 is formed in a cylindrical shape.
  • the sealing plug 53 includes a head portion 53a having a relatively large outer diameter and an insertion portion 53b continuous with the head portion 53a and having a relatively small outer diameter.
  • a head portion 53 a of the sealing plug 53 is welded to the lid 52 .
  • the sealing plug 53 is made of, for example, aluminum or an aluminum alloy.
  • the insulator 60 insulates the components of the battery 1 and the exterior body 50 .
  • the insulator 60 shown in FIGS. 2 to 6, 10, 11, 13, and 15 includes an insulating cover 61, a positive electrode-side first insulating plate 62, a negative electrode-side first insulating plate 63, and a positive electrode-side second insulating plate. 64 and a negative electrode side second insulating plate 65 .
  • the insulating cover 61 covers and insulates the charge/discharge body 10, for example, as shown in FIG.
  • the insulating cover 61 has a pair of opposing side surfaces (a first side surface 61a and a second side surface 61b) and an opening 61c that exposes one side portion 10a of the charge/discharge body 10 between the first side surface 61a and the second side surface 61b. contains.
  • the insulating cover 61 covers the one side portion 10a of the charge/discharge body 10 other than one surface.
  • the insulating cover 61 covers the other side portion 10b facing the one side portion 10a of the charge/discharge body 10 and the outer peripheral portion 10c positioned between the one side portion 10a and the other side portion 10b of the charge/discharge body 10. ing.
  • the insulating cover 61 is formed into a pentahedral shape by folding a polyhedral sheet into a box shape.
  • the insulating cover 61 is made of, for example, polypropylene.
  • the positive electrode side first insulating plate 62 insulates the positive electrode collector plate 21 and the conductive member 32 from the lid 52, for example, as shown in FIG.
  • the positive electrode side first insulating plate 62 includes a rectangular parallelepiped base 62a, an insertion hole 62b penetrating through the base 62a, and an annular side edge of the base 62a that is separated from the lid 52. It includes a convex portion 62c projecting in the direction.
  • the positive current collecting plate 21, the conductive member 32, and the like are accommodated in a space defined by the base portion 62a and the convex portion 62c.
  • the insertion portion 41b of the positive electrode terminal 41 is inserted into the insertion hole 62b.
  • the positive electrode side first insulating plate 62 is made of, for example, an insulating resin.
  • the negative electrode-side first insulating plate 63 insulates the negative electrode collector plate 22 and the lid 52, for example, as shown in FIG.
  • the negative electrode side first insulating plate 63 includes a rectangular parallelepiped base 63a, an insertion hole 63b penetrating through the base 63a, and an annular side edge of the base 63a that is separated from the lid 52. It includes a convex portion 63c projecting in the direction.
  • the negative current collector plate 22 is accommodated in a space defined by the base portion 63a and the convex portion 63c.
  • the insertion portion 42b of the negative terminal 42 is inserted into the insertion hole 63b.
  • the negative electrode side first insulating plate 63 is made of, for example, an insulating resin.
  • the positive electrode side second insulating plate 64 insulates the positive electrode terminal 41 and the lid 52, for example, as shown in FIG.
  • the positive electrode side second insulating plate 64 includes a rectangular parallelepiped base 64a, an insertion hole 64b penetrating through the base 64a, and an annular side edge of the base 64a that is separated from the lid 52. It includes a convex portion 64c projecting in the direction.
  • the positive electrode terminal 41 is accommodated in a space defined by the base portion 64a and the convex portion 64c.
  • the insertion portion 41b of the positive electrode terminal 41 is inserted into the insertion hole 64b.
  • the positive electrode side second insulating plate 64 is made of, for example, an insulating resin.
  • the negative electrode side second insulating plate 65 insulates the negative electrode terminal 42 and the lid 52, for example, as shown in FIG.
  • the negative electrode side second insulating plate 65 includes a rectangular plate-shaped base 65a, an insertion hole 65b penetrating the base 65a, and an annular side edge of the base 65a that is separated from the lid 52. It includes a convex portion 65c projecting in the direction.
  • the negative electrode-side second insulating plate 65 the negative electrode terminal 42 is accommodated in a space defined by the base portion 65a and the convex portion 65c.
  • the insertion portion 42b of the negative terminal 42 is inserted into the insertion hole 65b.
  • the negative electrode side second insulating plate 65 is made of, for example, an insulating resin.
  • the sealing body 70 seals the constituent members of the battery 1 and the exterior body 50 .
  • the sealing body 70 shown in FIGS. 2 to 5 , 13 and 15 includes a positive electrode side gasket 71 and a negative electrode side gasket 72 .
  • the positive electrode side gasket 71 insulates the positive electrode side second insulating plate 64 and the lid 52, for example, as shown in FIG.
  • the positive electrode side gasket 71 is formed in a cylindrical shape.
  • the positive electrode side gasket 71 includes a first insertion portion 71a having a relatively large outer diameter, a second insertion portion 71b continuing from the first insertion portion 71a and having a relatively small outer diameter, and a second insertion portion 71b having a relatively small outer diameter. It includes an insertion hole 71c passing through the first insertion portion 71a and the second insertion portion 71b.
  • the first insertion portion 71 a of the positive electrode side gasket 71 is inserted into the insertion hole 64 b of the positive electrode side second insulating plate 64 .
  • the second insertion portion 71 b of the positive electrode side gasket 71 is inserted into the positive electrode side insertion hole 52 a of the lid 52 .
  • the insertion portion 41b of the positive electrode terminal 41 is inserted into the insertion hole 71c.
  • the positive electrode side gasket 71 is made of, for example, insulating and elastic rubber.
  • the negative electrode side gasket 72 insulates the negative electrode side second insulating plate 65 and the lid 52, for example, as shown in FIG.
  • the negative electrode side gasket 72 is formed in a cylindrical shape.
  • the negative electrode side gasket 72 includes a first insertion portion 72a having a relatively large outer diameter, a second insertion portion 72b continuing from the first insertion portion 72a and having a relatively small outer diameter, and a second insertion portion 72b having a relatively small outer diameter. It includes an insertion hole 72c passing through the first insertion portion 72a and the second insertion portion 72b.
  • the first insertion portion 72 a of the negative electrode side gasket 72 is inserted into the insertion hole 65 b of the negative electrode side second insulating plate 65 .
  • the second insertion portion 72 b of the negative electrode side gasket 72 is inserted into the negative electrode side insertion hole 52 b of the lid 52 .
  • the insertion portion 42b of the negative terminal 42 is inserted into the insertion hole 72c.
  • the negative electrode side gasket 72 is made of, for example, insulating and elastic rubber.
  • FIG. 16 Manufacturing method of the battery 1 of the first embodiment
  • the manufacturing method of the battery 1 of the first embodiment only the manufacturing process unique to the battery 1 will be described, and the description of the manufacturing process similar to that of a general battery will be omitted.
  • the manufacturing method of the battery 1 a manufacturing method in which the negative electrode tab 12b covered with the negative electrode ribbon 24 is laser-welded to the negative electrode current collecting plate 22 will be described.
  • the structure of the laser welding on the positive electrode 11 side is the same as the structure of the laser welding on the negative electrode 12 side, so the description is omitted.
  • the negative electrode ribbon 24, the negative electrode tab 12b, and the negative electrode current collector plate 22 are laminated.
  • the first pressing member 501 and the second pressing member 502 are used to press both ends of the welded portion between the negative electrode ribbon 24 , the negative electrode tab 12 b and the negative electrode current collector plate 22 .
  • the first pressing member 501 and the second pressing member 502 are each formed in a rectangular parallelepiped shape and have sufficient rigidity.
  • the first pressing member 501 and the second pressing member 502 are made of metal blocks, for example.
  • the first pressing member 501 and the second pressing member 502 bring the negative electrode ribbon 24 and the negative electrode tab 12b into close contact, and also bring the negative electrode tab 12b and the negative electrode current collector plate 22 into close contact.
  • the negative electrode ribbon 24, the negative electrode tab 12b, and the negative electrode current collector plate 22 are in close contact with each other in a space in the Y-axis direction between the first pressing member 501 and the second pressing member 502, with the welded portion of the negative electrode ribbon 24 exposed. and laminated.
  • the negative electrode ribbon 24, the negative electrode tab 12b, and the negative electrode current collector plate 22 are laser-welded.
  • the negative electrode ribbon 24, the negative electrode tab 12b, and the negative electrode current collector plate 22 are irradiated with the laser light L1 from between the first pressing member 501 and the second pressing member 502 toward the negative electrode ribbon 24.
  • the welded portion between the negative electrode ribbon 24, the negative electrode tab 12b, and the negative electrode current collector plate 22 extends along the longitudinal direction of the battery 1 (the X-axis direction).
  • the laser beam L1 is scanned in the X-axis direction to continuously laser-weld the negative electrode ribbon 24, the negative electrode tab 12b, and the negative electrode current collector plate 22.
  • laser welding accompanied by wobbling is performed.
  • the laser beam L1 may be scanned in the X-axis direction to intermittently laser weld the welded portion between the negative electrode tab 12b and the negative electrode current collector plate 22 .
  • the first pressing member 501 and the second pressing member 502 are retracted from the negative electrode tab 12b.
  • a positive electrode collector plate 21, a positive electrode tab 11b, and a positive electrode ribbon 23 covering the positive electrode tab 11b and having a larger heat capacity than the positive electrode tab 11b are laminated and laser-welded, for example. . That is, in a state in which the positive electrode tab 11b is laminated with the positive electrode current collector plate 21 and the positive electrode ribbon 23 is laminated with the positive electrode tab 11b, the positive electrode ribbon 23, the positive electrode tab 11b, and the positive electrode current collector plate 21 are welded by laser welding, for example. ing.
  • the manufacturing method of the battery 1 includes a step of laminating and laser-welding the positive collector plate 21, the positive tab 11b, and the positive electrode ribbon 23. As shown in FIG.
  • the positive electrode ribbon 23 prevents the positive electrode tab 11b from evaporating during laser welding, so that the positive electrode tab 11b and the positive electrode current collector plate 21 are sufficiently bonded.
  • the positive electrode ribbon 23 can prevent the positive electrode tab 11b from evaporating during laser welding. and yield can be improved.
  • the battery 1 may have a configuration in which the positive electrode current collector plate 21, the positive electrode tab 11b, and the positive electrode ribbon 23 are resistance-welded. According to the configuration of the battery 1 as described above, the positive electrode ribbon 23 prevents the positive electrode tab 11b from evaporating during resistance welding, so that the positive electrode tab 11b and the positive electrode current collector plate 21 are sufficiently bonded.
  • the method of manufacturing the battery 1 may include a step of resistance welding the positive electrode current collector plate 21 , the positive electrode tab 11 b and the positive electrode ribbon 23 . In this method of manufacturing the battery 1, the positive electrode ribbon 23 can prevent the positive electrode tab 11b from evaporating during resistance welding. and yield can be improved.
  • the positive electrode current collector plate 21 and the positive electrode tab 11b and the positive electrode ribbon 23 are welded in a state in which the positive electrode current collector plate 21 and the positive electrode ribbon 23 are sandwiched between a pair of welding electrodes. Therefore, exposure of the welded portions of the positive electrode current collector plate 21 and the positive electrode ribbon 23 is suppressed by the pair of welding electrodes.
  • the positive collector plate 21, the positive tab 11b, and the positive ribbon 23 are welded by current input from a pair of welding electrodes.
  • the positive current collecting plate 21 and the positive electrode ribbon 23 are welded together. Welding is done. That is, resistance welding can suppress evaporation of, for example, the positive electrode ribbon 23 and the positive electrode current collector plate 21 as compared with laser welding.
  • the current interrupter 30 can be easily adopted. If, for example, the positive electrode tab 11b and the positive electrode current collector plate 21 were to be ultrasonically bonded without using the positive electrode ribbon 23 as in the conventional embodiment corresponding to the comparative example, vibrations due to ultrasonic bonding would cause Then, a load is applied to the current interrupter 30 . For this reason, in the comparison, the positive electrode current collector plate 21 is divided, and after laser welding the current interrupter 30 to one of the positive electrode current collector plates 21, both positive electrode current collector plates 21 are integrated by laser welding. I had to.
  • the positive electrode tab 11b and the positive electrode current collecting plate 21 are laser-welded by the laser beam L1.
  • laser welding is applied.
  • the welding region of the positive electrode tab 11b and the positive electrode current collector plate 21 is directly crimped or crimped. you don't have to. That is, in the first embodiment, since the joint portion between the positive electrode tab 11b and the positive electrode current collector plate 21 can be exposed, laser welding can be performed.
  • the positive electrode tab 11b and the positive electrode current collector plate 21 can be welded by laser welding, which has high versatility and can easily change the welding conditions.
  • the manufacturing method of Battery 1 laser welding with wobbling is performed. According to the manufacturing method of the battery 1, the productivity and yield of the battery 1 are improved by suppressing the welding failure between the positive electrode tab 11b and the positive electrode current collector plate 21 while suppressing the occurrence of spatter and blowholes. be able to. In addition, according to the manufacturing method of the battery 1, since a sufficient welding width can be secured between the positive electrode tab 11b and the positive electrode current collector plate 21, the bonding strength between the positive electrode tab 11b and the positive electrode current collector plate 21 can be increased. can be improved.
  • the positive electrode current collector plate 21, the positive electrode tab 11b, and the positive electrode ribbon 23 are laser-welded from the positive electrode ribbon 23 side.
  • the options for assembling the battery 1 can be expanded. That is, when laser welding is performed from the positive electrode ribbon 23 side, it is also possible to crimp and join the positive electrode current collector plate 21 to the positive electrode terminal 41 after laser welding the positive electrode current collector plate 21 and the positive electrode tab 11b. It is also possible to crimp and join the positive electrode current collector plate 21 to the positive electrode terminal 41 before laser welding the current collector plate 21 and the positive electrode tab 11b.
  • the positive current collector plate 21 is laser-welded to the positive electrode tab 11b, and then the positive current collector plate 21 is connected to the positive electrode terminal. 41, but if the positive current collector plate 21 is crimped and joined to the positive electrode terminal 41 before the positive electrode current collector plate 21 and the positive electrode tab 11b are laser-welded, the positive electrode current collector plate The condition of the weld marks of 21 becomes a problem. That is, in contrast, if the welding marks on the positive electrode current collector plate 21 are relatively large, it becomes an obstacle when joining the positive electrode current collector plate 21 to, for example, the positive electrode side first insulating plate 62 or the lid 52 .
  • the positive electrode tab 11b has a smaller heat capacity than the positive electrode current collector plate 21. According to such a configuration, the positive electrode tab 11b melts more easily than the positive electrode current collector plate 21 . As shown in FIG. 12, since the positive electrode tab 11b is sandwiched between the positive electrode ribbon 23 and the positive electrode current collector 21, the positive electrode tab 11b is melted along the entire length in the stacking direction (Y-axis direction) to form the positive electrode current collector 21. spliced. On the other hand, since the positive electrode current collecting plate 21 is more difficult to melt than the positive electrode tab 11b, only the region close to the positive electrode tab 11b in the total length in the stacking direction can be melted and joined to the positive electrode tab 11b. That is, the welding conditions as described above can be adopted. For this reason, the quality of the positive electrode current collector plate 21 after laser welding can be maintained.
  • the positive electrode ribbon 23 has a smaller heat capacity than the positive electrode current collector plate 21 . With such a configuration, the positive electrode ribbon 23 melts more easily than the positive electrode current collector plate 21 . As shown in FIG. 12 , the positive electrode ribbon 23 is melted along the entire length in the stacking direction (Y-axis direction) and joined to the positive current collector plate 21 . On the other hand, since the positive electrode current collecting plate 21 is more difficult to melt than the positive electrode ribbon 23, only the region near the positive electrode tab 11b in the total length in the stacking direction can be melted and joined to the positive electrode tab 11b. That is, the welding conditions as described above can be adopted. For this reason, the quality of the positive electrode current collector plate 21 after laser welding can be maintained.
  • the positive electrode ribbon 23 is thicker than the positive electrode tab 11b along the stacking direction. According to such a configuration, when the positive electrode ribbon 23 and the positive electrode tab 11b are made of the same or similar materials, the positive electrode ribbon 23 is less likely to melt than the positive electrode tab 11b. Therefore, the positive electrode tab 11b can be melted while suppressing evaporation of the positive electrode ribbon 23 during laser welding. That is, the welding conditions as described above can be adopted. Therefore, the positive electrode tab 11b and the positive electrode collector plate 21 can be sufficiently laser-welded.
  • the thickness of the positive electrode ribbon 23 along the stacking direction is thinner than that of the positive electrode current collector plate 21 .
  • the positive electrode ribbon 23 melts more easily than the positive electrode current collector plate 21 . Therefore, as shown in FIG. 12, the positive electrode ribbon 23 melts along the entire length in the stacking direction (Y-axis direction) in order to transfer heat to the positive electrode tab 11b, and the positive electrode current collector plate 21 becomes the positive electrode over the entire length in the stacking direction.
  • the positive electrode tab 11b and the positive current collector plate 21 can be sufficiently laser-welded in a state in which only the region near the tab 11b is melted.
  • the positive electrode current collector plate 21, the positive electrode tab 11b, and the positive electrode ribbon 23 are made of the same or similar material. According to such a configuration, the specific heat of the positive electrode current collector plate 21, the positive electrode tab 11b, and the positive electrode ribbon 23 can be made the same or equivalent. Therefore, by considering the thicknesses of the positive electrode current collector plate 21, the positive electrode tab 11b, and the positive electrode ribbon 23 when setting the conditions for laser welding, the positive electrode tab 11b and the positive electrode current collector plate 21 covered with the positive electrode ribbon 23 can be sufficiently separated. can be laser welded.
  • the positive electrode collector plate 21, the positive electrode tab 11b, and the positive electrode ribbon 23 are made of aluminum or an aluminum alloy material. According to such a configuration, even when the frequency of the laser light L1 is in the infrared region and aluminum or an aluminum alloy having a relatively high reflectance in the infrared region is used as the material, the positive electrode tab during laser welding can be used. Evaporation of 11b can be prevented by cathode ribbon 23 . That is, in order to laser-weld the positive electrode tab 11b and the positive electrode current collector plate 21, sufficient heat input to the positive electrode tab 11b and the positive electrode current collector plate 21 is required in consideration of the energy loss due to the reflection of the laser beam L1. is. Therefore, by making the positive electrode ribbon 23 function as a cover layer, evaporation of the positive electrode tab 11b can be prevented. Therefore, the positive electrode tab 11b and the positive electrode collector plate 21 can be sufficiently laser-welded.
  • the positive electrode tab 11b protrudes from the side edge 11c of the positive electrode current collecting layer 11S. According to such a configuration, the positive electrode tab 11b and the positive electrode current collector plate 21 can be sufficiently bonded while preventing the positive electrode tab 11b from interfering with the positive electrode current collecting layer 11S and the positive electrode active material layer 11T. .
  • the first pressing member 501 and the second pressing member 502 are used to press both ends of the welded portions of the positive electrode ribbon 23, the positive electrode tab 11b, and the positive electrode current collector plate 21 to each other.
  • the positive electrode tab 11b and the positive electrode current collector plate 21 are sufficiently adhered to each other without directly pressing the positive electrode ribbon 23, the positive electrode tab 11b and the positive electrode current collector plate 21 together. can be brought into contact with each other.
  • the charge/discharge body 10 is configured by winding a positive electrode 11 and a negative electrode 12 with a separator 13 interposed therebetween. As shown in the first embodiment, the battery 1 can be applied to a battery having a wound-type charge/discharge body 10 .
  • the effect of the first embodiment has been described using the configuration of the connection between the positive electrode tab 11b and the positive electrode current collector plate 21.
  • the effect of joining the negative electrode tab 12b and the negative electrode current collector plate 22 is the same as the effect of joining the positive electrode tab 11b and the positive electrode current collector plate 21 described above.
  • the battery 2 of the second embodiment is configured by stacking a plurality of electrode tabs of the same polarity.
  • the same components as those of the battery 1 of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
  • the configuration unique to the battery 2 will be mainly described. In the description of the manufacturing method of the battery 2 of the second embodiment, only the manufacturing process unique to the battery 2 will be described, and the description of the manufacturing process similar to that of a general battery will be omitted.
  • the battery 2 of the second embodiment has a charge/discharge body 210 instead of the charge/discharge body 10 .
  • the charging/discharging body 210 includes one side portion 210a from which a positive electrode tab 211b and a negative electrode tab 212b protrude, another side portion 210b facing the one side portion 210a, and one side portion 210a and the other side portion 210b. It has an outer peripheral portion 210c located between.
  • the charge/discharge body 210 is of a wound type in which a positive electrode 211 and a negative electrode 212 are laminated and wound with a separator 13 interposed therebetween.
  • a plurality of positive electrode tabs 211b are formed on the positive electrode 211 .
  • a plurality of negative electrode tabs 212b are formed on the negative electrode 212 .
  • the plurality of negative electrode tabs 212b are superimposed as shown in FIG.
  • the plurality of negative electrode tabs 212 b are laser-welded to the negative electrode current collector plate 22 while being covered with the negative electrode ribbon 24 . That is, the plurality of negative electrode tabs 212 b are laser-welded to the negative electrode ribbon 24 and the negative electrode current collector plate 22 while being sandwiched between the negative electrode ribbon 24 and the negative electrode current collector plate 22 .
  • a plurality of negative electrode tabs 212 b are superimposed, and the heat capacity of one negative electrode tab 212 b is configured to be smaller than the heat capacity of the negative electrode ribbon 24 .
  • the configuration for laser welding on the positive electrode 211 side is the same as the configuration for laser welding on the negative electrode 212 side. That is, the plurality of positive electrode tabs 211b are laser-welded to the positive electrode ribbon 23 and the positive electrode current collector plate 21 while being sandwiched between the positive electrode ribbon 23 and the positive electrode current collector plate 21 . A plurality of positive electrode tabs 211 b are superimposed, and the heat capacity of one positive electrode tab 211 b is configured to be smaller than the heat capacity of the positive electrode ribbon 23 .
  • a manufacturing method unique to the battery 2 of the second embodiment is to laser-weld the plurality of positive electrode tabs 211b that are covered and overlapped with the positive electrode ribbon 23 and the positive current collector plate 21 . Further, in the second embodiment, the plurality of negative electrode tabs 212b covered and overlapped with the negative electrode ribbon 24 and the negative electrode current collector plate 22 are laser-welded.
  • the battery 2 of the second embodiment is of a wound type and is composed of a charge/discharge body 210 in which a plurality of electrode tabs of the same polarity are superimposed.
  • the positive electrode ribbon 23 prevents the positive electrode tabs 211b from evaporating during laser welding.
  • the negative electrode ribbon 24 prevents the negative electrode tabs 212b from evaporating during laser welding, the plurality of negative electrode tabs 212b and the negative electrode current collector plate 22 are sufficiently bonded.
  • the cathode ribbon 23 can prevent the cathode tabs 211b from evaporating during laser welding. 2 productivity and yield can be improved.
  • the negative electrode ribbon 24 can prevent the negative electrode tab 212b from evaporating during laser welding. productivity and yield can be improved.
  • the heat capacity of the positive electrode ribbon 23 is greater than that of one positive electrode tab 211b. Therefore, for example, when laser welding is performed from the positive electrode ribbon 23 side, evaporation of all the positive electrode tabs 211b including one positive electrode tab 211b in direct contact with the positive electrode ribbon 23 can be prevented.
  • the heat capacity of the negative electrode ribbon 24 is greater than the heat capacity of one negative electrode tab 212b. Therefore, for example, when laser welding is performed from the negative electrode ribbon 24 side, evaporation of all negative electrode tabs 212b including one negative electrode tab 212b in direct contact with the negative electrode ribbon 24 can be prevented.
  • the second embodiment multiple electrode tabs with the same polarity are superimposed. Therefore, when laser welding is performed, for example, energy loss occurs at the interface between the adjacent positive electrode tabs 211b. Therefore, it is necessary to increase the amount of heat input during laser welding in consideration of the energy loss at the interface between the adjacent positive electrode tabs 211b.
  • the second embodiment since evaporation of the plurality of positive electrode tabs 211b during laser welding is prevented by the positive electrode ribbon 23, even if energy loss occurs at the interface between the adjacent positive electrode tabs 211b during laser welding, , the plurality of positive electrode tabs 211b and the positive current collecting plate 21 can be sufficiently bonded.
  • the second embodiment has been described on the assumption that it is configured for laser welding, it may be configured for resistance welding.
  • 2nd Embodiment produces the same effect as the structure of laser welding, when it is set as the structure of resistance welding.
  • the battery 3 of the third embodiment is of a laminated type in which the charge/discharge body 310 is not wound.
  • the same components as those of the battery 1 of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
  • the configuration specific to the battery 3 will be mainly described. In the description of the manufacturing method of the battery 3 of the third embodiment, only the manufacturing process unique to the battery 3 will be described, and the description of the manufacturing process similar to that of a general battery will be omitted.
  • the battery 3 of the third embodiment has a charge/discharge body 310 instead of the charge/discharge body 10 unlike the battery 1 of the first embodiment.
  • the charging/discharging body 310 includes a side portion 310a from which a positive electrode tab 311b and a negative electrode tab 312b protrude, a side portion 310b facing the side portion 310a, and an outer peripheral portion positioned between the side portion 310a and the other side portion 310b. 310c.
  • the charge/discharge body 310 is of a laminated type in which a positive electrode 311 and a negative electrode 312 are laminated with a separator 313 interposed therebetween.
  • the charge/discharge body 310 is configured by stacking a plurality of positive electrodes 311, separators 313, and negative electrodes 312, which are each formed in a rectangular shape, in the order of a positive electrode 311, a separator 313, a negative electrode 312, and a separator 313.
  • Each positive electrode 311 is formed with one positive electrode tab 311b.
  • Each negative electrode 312 is formed with one negative electrode tab 312b.
  • a plurality of negative electrode tabs 312b are superimposed as shown in FIG.
  • the plurality of negative electrode tabs 312 b are laser-welded to the negative current collector plate 22 while being covered with the negative electrode ribbon 24 . That is, the plurality of negative electrode tabs 312b are laser-welded to the negative electrode ribbon 24 and the negative electrode current collector plate 22 while being sandwiched between the negative electrode ribbon 24 and the negative electrode current collector plate 22 .
  • the configuration for laser welding on the positive electrode 311 side is the same as the configuration for laser welding on the negative electrode 312 side. That is, the plurality of positive electrode tabs 311b are laser-welded to the positive electrode ribbon 23 and the positive electrode current collector plate 21 while being sandwiched between the positive electrode ribbon 23 and the positive electrode current collector plate 21 .
  • a plurality of relatively short positive electrodes and a plurality of relatively short negative electrodes are opposed to one long separator via the separator. It is possible to apply a lamination type in which the layers are alternately provided. This modification is a so-called Z-fold lamination type.
  • the positive electrode and the negative electrode face each other with the separator interposed therebetween by folding and stacking the separator.
  • the manufacturing method specific to the battery 3 of the third embodiment is the same as the manufacturing method specific to the battery 2 of the second embodiment.
  • the battery 3 of the third embodiment is of a laminated type in which the charge/discharge body 310 is not wound.
  • the charging/discharging body 310 is configured by stacking a plurality of positive electrodes 311, separators 313, and negative electrodes 312, each having a rectangular shape, in the order of separators 313, negative electrodes 312, and separators 313.
  • the third embodiment has been described on the assumption that it is configured for laser welding, it may be configured for resistance welding.
  • 3rd Embodiment produces the same effect as the structure of laser welding, when it is set as the structure of resistance welding.
  • the battery 4 of the fourth embodiment is configured by arranging two charge/discharge bodies 410 side by side.
  • the same components as those of the battery 1 of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
  • the configuration specific to the battery 4 will be mainly described. In the description of the manufacturing method of the battery 4 of the fourth embodiment, only the manufacturing process unique to the battery 4 will be described, and the description of the manufacturing process similar to that of a general battery will be omitted.
  • the battery 4 of the fourth embodiment has two charge/discharge bodies 410 instead of the charge/discharge body 10 .
  • the charging/discharging body 410 has one side portion 410a from which the positive electrode tab 411b and the negative electrode tab 412b protrude, the other side portion 410b facing the one side portion 410a, and the outer peripheral portion positioned between the one side portion 410a and the other side portion 410b. 410c.
  • the two charge/discharge bodies 410 are arranged in the lateral direction (Y-axis direction) of the battery 4 .
  • the two charge/discharge bodies 410 are electrically connected in parallel, for example.
  • the charge/discharge body 410 is of a wound type in which a positive electrode 411 and a negative electrode 412 are laminated and wound with a separator 413 interposed therebetween.
  • a plurality of positive electrode tabs 411 b are formed on the positive electrode 411 .
  • a plurality of negative electrode tabs 412 b are formed on the negative electrode 412 .
  • the positive electrode current collector plate 121 and the negative electrode current collector plate 122 of the current collector 120, the positive electrode terminal 141 and the negative electrode terminal 142 of the external terminal 140, the container and lid 152 of the exterior body 150, the negative electrode side first insulating plate 163 of the insulator 160, etc. , and the sealing body are longer in the lateral direction (Y-axis direction) than the battery 1 .
  • each constituent member of the battery 4 is matched in size with two charging/discharging bodies 410 arranged along the lateral direction (Y-axis direction) of the battery 4 .
  • a plurality of negative electrode tabs 412 b provided on each of the two charge/discharge bodies 410 are laser-welded to the negative electrode current collector plate 122 while being covered with the negative electrode ribbons 24 .
  • a plurality of negative electrode tabs 412b provided on one charge/discharge body 410 and a plurality of negative electrode tabs 412b provided on the other charge/discharge body 410 are arranged along the lateral direction (Y-axis direction) of the negative electrode current collector plate 122. facing each other.
  • the configuration for laser welding on the positive electrode 411 side is the same as the configuration for laser welding on the negative electrode 412 side.
  • a plurality of positive electrode tabs 411b covered and overlapped with the positive electrode ribbon 23 are attached to the positive current collector plate in the lateral direction (Y-axis direction) of the battery 4.
  • a plurality of sets (for example, two sets) are arranged so as to face each other along the direction) and are laser-welded.
  • a plurality of negative electrode tabs 412b covered with the negative electrode ribbon 24 and superimposed on the negative electrode current collecting plate 122 are attached along the lateral direction (Y-axis direction) of the battery 4.
  • a plurality of sets (for example, two sets) are arranged so as to face each other and are laser-welded.
  • the battery 4 of the fourth embodiment is a wound type, and is configured by providing a plurality of sets (for example, two sets) of charge/discharge bodies 410 in which a plurality of electrode tabs of the same polarity are superimposed. Such a battery 4 of the fourth embodiment can obtain effects similar to those of the battery 2 of the second embodiment and the battery 3 of the third embodiment.
  • a positive electrode collector plate 221 is formed with a convex positive electrode junction portion 221f. Further, the negative electrode collector plate 222 is formed with a negative electrode joint portion 222 f having a convex shape.
  • the same components as those of the battery 1 of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
  • the configuration unique to the battery 5 will be mainly described. In the description of the manufacturing method of the battery 5 of the fifth embodiment, only the manufacturing process specific to the battery 5 will be described, and the description of the manufacturing process similar to that of a general battery will be omitted.
  • the positive electrode current collector plate 221 includes a first base 221a having the same shape as the first base 21a in FIG. 15, a second base 221b having the same shape as the second base 21b, and a connecting portion.
  • a connecting portion 221c having the same shape as 21c is included.
  • a recess having the same shape as the recess 21d shown in FIG. 15 is formed on the upper surface of the second base portion 221b.
  • a fragile portion having the same shape as the fragile portion 21e shown in FIG. 15 is formed in the center of the concave portion of the second base portion 221b.
  • the first base portion 221a of the positive electrode current collector plate 221 is formed with a convex positive electrode joint portion 221f protruding downward (in the negative direction of the Z-axis).
  • the positive electrode junction portion 221f is formed in a triangular shape.
  • Positive electrode junction portion 221f extends in the longitudinal direction (X-axis direction) of charge/discharge body 10 while facing charge/discharge body 10 .
  • the positive electrode joint portion 221f has higher rigidity in the stacking direction (Z-axis direction) of the positive electrode tab 11b and the positive electrode current collecting plate 221 than the positive electrode tab 11b.
  • the tip of the positive electrode joint portion 221f and the positive electrode tab 11b are laser-welded.
  • the positive electrode tab 11b is deformed along the convex positive electrode junction portion 221f by being pressed toward the positive electrode junction portion 221f when being laser-welded to the positive electrode junction portion 221f.
  • the positive collector plate 221 is made of, for example, aluminum or an aluminum alloy.
  • the welded portion 23g of the positive electrode ribbon 23, the welded portion 11g of the positive electrode tab 11b, and the welded portion 221g of the positive electrode joining portion 221f are laser-welded.
  • the positive electrode ribbon 23 is laser-welded to the positive electrode tab 11b and the positive electrode joint portion 221f
  • the portion other than the welded portion 23g bends and hangs down in the negative direction of the Z axis due to its own weight.
  • the positive electrode tab 11b bends in the negative direction of the Z-axis due to its own weight and hangs down except for the welded portion 11g.
  • the negative electrode current collector plate 222 includes a base portion 222a having the same shape as the base portion 22a of FIG. 13, and an insertion hole 222b having the same shape as the insertion hole 22b.
  • the base 222a of the negative electrode current collecting plate 222 is formed with a convex negative electrode joint portion 222f protruding downward (in the negative direction of the Z axis).
  • the negative electrode junction portion 222f is formed in a triangular shape. Negative electrode junction portion 222f extends in the longitudinal direction (X-axis direction) of charge/discharge body 10 while facing charge/discharge body 10 .
  • the negative electrode joint portion 222f has higher rigidity in the stacking direction (Z-axis direction) of the negative electrode tab 12b and the negative electrode current collector plate 222 than the negative electrode tab 12b.
  • the tip of the negative electrode joint portion 222f and the negative electrode tab 12b are laser-welded.
  • the negative electrode tab 12b is pressed toward the negative electrode joint portion 222f when it is laser-welded to the negative electrode joint portion 222f, so that it is deformed along the convex negative electrode joint portion 222f.
  • the negative electrode current collector plate 222 is made of, for example, copper or a copper alloy.
  • the manufacturing method of the battery 5 of the fifth embodiment only the manufacturing process specific to the battery 5 will be described, and the description of the manufacturing process similar to that of a general battery will be omitted.
  • the manufacturing method of the battery 5 a manufacturing method in which the negative electrode tab 12b covered with the negative electrode ribbon 24 is laser-welded to the convex negative electrode bonding portion 222f of the negative electrode current collecting plate 222 will be described.
  • the structure of the laser welding on the positive electrode 11 side is the same as the structure of the laser welding on the negative electrode 12 side, so the description is omitted.
  • the negative electrode ribbon 24, the negative electrode tab 12b, and the negative electrode current collector plate 222 are laminated.
  • the first pressing member 501 and the second pressing member 502 are used to bring both ends of the welded portion of the negative electrode ribbon 24, the negative electrode tab 12b, and the negative electrode current collector plate 222 into contact with each other.
  • the first pressing member 501 and the second pressing member 502 bring the negative electrode ribbon 24 and the negative electrode tab 12b into close contact, and also bring the negative electrode tab 12b and the negative electrode joint portion 222f of the negative current collector plate 222 into close contact.
  • the welded portion of the negative electrode ribbon 24 is exposed in the space in the Y-axis direction between the first pressing member 501 and the second pressing member 502. are stacked in close contact with each other.
  • the negative electrode ribbon 24 and the negative electrode tab 12b are in contact with the negative electrode bonding portion 222f, when the negative electrode ribbon 24 and the negative electrode tab 12b are pressed along both sides of the negative electrode bonding portion 222f (both sides in the Y-axis direction), the negative electrode ribbon 24 and the negative electrode tab 12b is subjected to tension in both the positive and negative directions of the Y axis centering on the negative electrode joint 222f. As a result, the negative electrode ribbon 24 and the negative electrode tab 12b are pressed against the negative electrode joint portion 222f.
  • the negative electrode ribbon 24, the negative electrode tab 12b, and the negative electrode joint portion 222f are in close contact with each other.
  • the negative electrode ribbon 24, the negative electrode tab 12b, and the negative electrode current collecting plate 222 are laser-welded.
  • the negative electrode ribbon 24, the negative electrode tab 12b, and the negative electrode current collecting plate 222 are irradiated with the laser light L1 from between the first pressing member 501 and the second pressing member 502 toward the negative electrode ribbon 24.
  • the welded portion between the negative electrode ribbon 24 and the negative electrode tab 12b and the negative electrode current collector plate 222 extends along the longitudinal direction (X-axis direction) of the battery 5 .
  • the laser beam L1 is scanned in the X-axis direction to continuously laser-weld the negative electrode ribbon 24, the negative electrode tab 12b, and the negative electrode current collecting plate 222.
  • laser welding accompanied by wobbling is performed.
  • the laser beam L1 may be scanned in the X-axis direction to intermittently laser weld the welded portion between the negative electrode tab 12b and the negative electrode current collector plate 222 .
  • the first pressing member 501 and the second pressing member 502 are retracted from the negative electrode tab 12b.
  • the convex positive electrode junction portion 221f of the positive electrode current collecting plate 221, the positive electrode tab 11b and, for example, the positive electrode ribbon 23 are laminated and laser-welded.
  • the convex positive electrode junction portion 221f of the positive electrode current collector plate 221, the positive electrode tab 11b and, for example, the positive electrode ribbon 23 are laser-welded. According to such a configuration, the positive electrode tab 11b and the positive electrode joint portion 221f of the positive electrode current collector plate 221 can be sufficiently welded to each other in a state in which they are sufficiently in contact with each other.
  • the positive electrode junction portion 221f which is the welding region, protrudes from the positive electrode current collector plate 221 as in the fifth embodiment, it is easy to bring the positive electrode tab 11b and the positive electrode junction portion 221f into close contact. Therefore, for example, the positive electrode tab 11b and the positive electrode joint portion 221f can be sufficiently welded to establish electrical continuity. Therefore, in the battery 5, for example, the conductivity between the positive electrode tab 11b and the positive electrode collector plate 221 can be enhanced. In addition, in the method for manufacturing the battery 5, for example, defective welding between the positive electrode tab 11b and the positive electrode current collector plate 221 can be suppressed, and the productivity and yield of the battery 5 can be improved.
  • a positive electrode junction portion 221f of the positive electrode current collecting plate 221 is formed in a triangular shape. According to such a configuration, it is possible to concentrate stress on the positive electrode tab 11b and the triangular corner portion (tip portion) of the positive electrode joint portion 221f so as to bring them into close contact with each other. Therefore, the positive electrode junction portion 221f of the positive electrode current collector plate 221 and the positive electrode tab 11b can be sufficiently bonded.
  • the positive electrode tab 11b deformed into a convex shape along the positive electrode junction portion 221f of the positive electrode current collector plate 221 is welded to the positive electrode junction portion 221f.
  • welding can be performed at the positive electrode tab 11b and the positive electrode junction portion 221f by bringing the positive electrode tab 11b and the positive electrode junction portion 221f into close contact along the convex positive electrode junction portion 221f.
  • Sufficient area can be secured. That is, the positive electrode tab 11b can be welded in close contact with the positive electrode joint portion 221f at any portion deformed into a convex shape.
  • the positive electrode tab 11b and the tip of the positive electrode joint portion 221f of the positive electrode current collecting plate 221 are welded. According to such a configuration, in the battery 5, the positive electrode tab 11b and the positive electrode current collector plate 221 can be sufficiently joined with a minimum welding area. On the other hand, one of the two opposing inclined surfaces of the positive electrode tab 11b and the positive electrode joint portion 221f may be welded. Alternatively, the positive electrode tab 11b may be welded over the entire surface from the base end of the positive electrode joint portion 221f to the tip in the Z-axis negative direction.
  • the positive electrode joint portion 221f of the positive electrode current collector plate 221 has higher rigidity in the stacking direction (Z-axis direction) of the positive electrode tab 11b and the positive electrode current collector plate 221 than the positive electrode tab 11b. According to such a configuration, the positive electrode tab 11b can be deformed along the shape of the positive electrode joint portion 221f, and the positive electrode tab 11b can be welded in a state of being in close contact with the positive electrode joint portion 221f. Therefore, the positive electrode tab 11b and the positive electrode collector plate 221 can be sufficiently bonded.
  • the positive electrode joint portion 221f of the positive electrode current collector plate 221 extends in the longitudinal direction (X-axis direction) of the rectangular parallelepiped charge/discharge body 10 while facing the charge/discharge body 10 . According to such a configuration, the welding region between the positive electrode tab 11b and the positive electrode current collector plate 221 can be sufficiently secured along the longitudinal direction (X-axis direction) of the charge/discharge body 10 .
  • the first pressing member 501 and the second pressing member 502 are used to press both ends of the welded portions of the positive electrode ribbon 23, the positive electrode tab 11b, and the positive electrode collector plate 221 against each other.
  • the positive electrode tab 11b and the positive electrode current collector plate 221 are sufficiently adhered without directly pressing the positive electrode ribbon 23, the positive electrode tab 11b and the positive electrode current collector plate 221. can be brought into contact with each other.
  • the positive electrode tab 11b is in contact with the positive electrode joint portion 221f and pressed along both sides of the positive electrode joint portion 221f (both sides in the Y-axis direction)
  • the positive electrode tab 11b is bent around the positive electrode joint portion 221f.
  • the effect of the fifth embodiment has been described using the configuration of the connection between the positive electrode tab 11b and the positive electrode current collector plate 221.
  • the effect of bonding the negative electrode tab 12b and the negative current collector plate 222 is the same as the effect of bonding the positive electrode tab 11b and the positive electrode current collector plate 221 described above.
  • the fifth embodiment has been described on the assumption that it is configured for laser welding, it may be configured for resistance welding. In the fifth embodiment, when resistance welding is used, the same effect as that of laser welding can be obtained.
  • the positive electrode junction portion 223f of the positive electrode current collector plate 223 is formed in a trapezoidal shape protruding in the negative direction of the Z-axis with the portion in contact with the first base portion 223a as the base.
  • the positive electrode joint portion 223f has a trapezoidal shape tapered in the negative Z-axis direction in cross section in the Y-axis direction and the Z-axis direction, and extends in the X-axis direction.
  • the positive electrode junction portion 223f has a tip formed on a plane parallel to the first base portion 223a, and both ends in the Y-axis direction formed on inclined surfaces inclined toward the first base portion 223a.
  • a sufficient welding region with the positive electrode tab 11b can be secured by the flat portion of the tip of the positive electrode joint portion 223f, so that the positive electrode joint portion 223f and the positive electrode tab 11b covered with the positive electrode ribbon 23 can be separated. Adequate bonding is possible.
  • the positive electrode junction portion 224f of the positive electrode current collector plate 224 is formed in an arc shape protruding in the negative direction of the Z-axis starting from the portion in contact with the first base portion 224a.
  • the positive electrode joint portion 224f has an arc-shaped cross section in the Y-axis direction and the Z-axis direction, and extends in the X-axis direction.
  • the positive electrode junction portion 224f is formed in a semicircular shape toward the tip projecting in the Z-axis negative direction from the first base portion 224a.
  • the positive electrode junction portion 224f may have a semi-elliptical shape or a semi-parabolic shape. According to such a configuration, the arc-shaped positive electrode joint portion 224f can eliminate the inflection point at the contact portion with the positive electrode tab 11b. , the positive electrode tab 11b covered with the positive electrode ribbon 23 can be sufficiently bonded.
  • the positive electrode junction portion 225f of the positive electrode collector plate 225 is formed in an arc shape protruding in the negative direction of the Z-axis starting from the portion in contact with the first base portion 225a, and has a first It is formed on a plane parallel to the base 225a.
  • the positive electrode joint portion 225f has an arc-shaped cross section in the Y-axis direction and the Z-axis direction with a flat surface at the tip, and extends in the X-axis direction. According to such a configuration, the planar portion of the tip of the positive electrode joint portion 225f can sufficiently secure a welding area with the positive electrode tab 11b, so that the positive electrode joint portion 225f and the positive electrode tab 11b can be sufficiently joined. Furthermore, according to such a configuration, the load applied to the positive electrode tab 11b covered by the positive electrode ribbon 23 can be reduced by the circular arc portion around the tip of the positive electrode connection portion 225f.
  • the battery 6 of the sixth embodiment corresponds to a configuration in which the second embodiment shown in FIGS. 19 and 20 and, for example, the fifth embodiment shown in FIG. 25 are combined. Also, the battery 6 corresponds to a configuration obtained by combining the third embodiment shown in FIGS. 21 and 22 and the fifth embodiment shown in FIG. 25, for example.
  • a plurality of positive electrode tabs 211b covered with the positive electrode ribbon 23 or a plurality of positive electrode tabs 311b covered with the positive electrode ribbon 23 are laser-welded to the positive electrode joint portion 221f of the positive electrode current collector plate 221.
  • the battery 6 has a plurality of negative electrode tabs 212b covered with the negative electrode ribbon 24 or a plurality of tabs covered with the negative electrode ribbon 24 with respect to the negative electrode junction portion 222f of the negative electrode current collector plate 222.
  • the negative electrode tab 312b is laser welded.
  • the manufacturing method of the battery 6 of the sixth embodiment is the same as the manufacturing method of the battery 5 of the fifth embodiment.
  • a plurality of negative electrode tabs 212b or negative electrode tabs 312b covered and overlapped with the negative electrode ribbon 24 and the negative electrode current collecting plate 222 are laser welded.
  • the plurality of positive electrode tabs 211b or the positive electrode tabs 311b that are covered and overlapped with the positive electrode ribbon 23 and the positive current collector plate 221 are laser-welded.
  • the plurality of stacked negative electrode tabs 212b and the negative electrode joint portion 222f of the negative electrode current collector plate 222 are welded. Even with such a configuration, all of the plurality of negative electrode tabs 212b and the negative electrode joint portion 222f can be directly or indirectly welded without creating a gap between the adjacent negative electrode tabs 212b. . That is, since the negative electrode joint portion 222f, which is the welding region, protrudes from the negative electrode current collector plate 222, all of the plurality of negative electrode tabs 212b and the negative electrode joint portion 222f are easily brought into direct or indirect contact with each other. Therefore, all of the plurality of negative electrode tabs 212b and the positive electrode bonding portion 221f can be sufficiently bonded.
  • the negative electrode joint portion 222f of the negative electrode current collector plate 222 has higher rigidity in the stacking direction (Z-axis direction) of the negative electrode tabs 212b and the negative electrode current collector plate 222 than, for example, the plurality of stacked negative electrode tabs 212b. According to such a configuration, even when a plurality of negative electrode tabs 212b are superimposed, all of the plurality of negative electrode tabs 212b are deformed along the shape of the negative electrode bonding portion 222f of the negative electrode current collector plate 222, and directly Alternatively, it can be welded while being in close contact with the negative electrode joint portion 222f indirectly. Therefore, all the negative electrode tabs 212b and the negative electrode current collector plates 222 can be sufficiently bonded.
  • the effect of the sixth embodiment has been described above using the configuration of welding the plurality of negative electrode tabs 212b and the like and the negative electrode current collector plate 222 that are overlapped.
  • the effect of welding the plurality of stacked positive electrode tabs and the positive electrode current collector plate 221 is the same as the effect of welding the plurality of stacked negative electrode tabs 212b and the negative electrode current collector plate 222 described above.
  • the sixth embodiment has been described on the assumption that it is configured for laser welding, it may be configured for resistance welding. In the sixth embodiment, when resistance welding is used, the same effect as laser welding is achieved.
  • the battery 7 of the seventh embodiment corresponds to a configuration in which the fourth embodiment shown in FIGS. 23 and 24 and, for example, the fifth embodiment shown in FIG. 25 are combined.
  • each negative electrode junction portion 322f is formed in a triangular shape. Each negative electrode junction portion 322 f extends in the longitudinal direction (X-axis direction) of charge/discharge body 410 while facing charge/discharge body 410 .
  • the plurality of negative electrode tabs 412b provided on each of the two charge/discharge bodies 410 are connected to one of the two negative electrode junction portions 322f formed on the negative electrode current collector plate 322, which is located relatively close to the negative electrode junction portion. 322f and laser welded. A plurality of negative electrode tabs 412b covered with the negative electrode ribbon 24 are laser-welded to the negative electrode joint portions 322f of the negative electrode current collector plates 322, respectively.
  • the structure of joining the positive electrode collector plate and the plurality of positive electrode tabs 411b is the same as the structure of the negative electrode collector plate 322 and the plurality of negative electrode tabs 412b.
  • three or more charge/discharge bodies may be arranged side by side in the lateral direction (Y-axis direction) of the battery 7 .
  • the collector plate is formed with three or more joints spaced apart in the lateral direction (Y-axis direction) of the battery.
  • the manufacturing method of the battery 7 of the seventh embodiment is the same as the manufacturing method of the battery 6 of the sixth embodiment.
  • a plurality of sets (for example, two sets) are arranged so as to face each other along the Y-axis direction) and laser-welded.
  • a plurality of positive electrode tabs 411b that are covered and overlapped with the positive electrode ribbon 23 are attached to the positive current collector plate along the lateral direction (Y-axis direction) of the battery 7.
  • a plurality of sets (for example, two sets) are arranged so as to face each other and are laser-welded.
  • a plurality (two) of wound-type charge/discharge bodies 410 are arranged side by side in the lateral direction (Y-axis direction) of the battery 7 .
  • two negative electrode junction portions 322f are formed on the negative electrode current collector plate 322 so as to be separated from each other in the lateral direction (Y-axis direction) of the battery 7 .
  • the plurality of negative electrode tabs 412b provided on each of the two charge/discharge bodies 410 are connected to one of the two negative electrode junction portions 322f formed on the negative electrode current collector plate 322, which are positioned relatively close to each other. It can be bundled and joined to the negative electrode joint portion 322f.
  • the positive electrode collector plate also has the same effect as the negative electrode collector plate 322 described above.
  • three or more charge/discharge bodies may be arranged side by side in the lateral direction (Y-axis direction) of the battery 7 .
  • the collector plate is formed with three or more joints spaced apart in the lateral direction (Y-axis direction) of the battery.
  • the seventh embodiment has been described on the assumption that it is configured for laser welding, it may be configured for resistance welding.
  • the same effect as that of laser welding can be obtained.
  • the battery of the present invention is not limited to the configurations described in the embodiments, and can be appropriately configured based on the contents described in the claims.
  • the battery of the present invention is not limited to a configuration in which the first current collector, electrode tabs, and second current collector are laser-welded.
  • the battery of the present invention can be applied to a configuration in which the first current collector, electrode tabs, and second current collector are resistance-welded.
  • Batteries of the present invention are not limited to lithium ion batteries.
  • the battery of the present invention can be applied to, for example, nickel-metal hydride batteries and lead-acid batteries.
  • the battery of the present invention is not limited to secondary batteries.
  • the battery of the present invention can be applied to primary batteries.
  • the positive collector plate 21 and the positive terminal 41 are configured separately, but the positive collector plate 21 and the positive terminal 41 may be configured integrally. That is, the first current collector may have a configuration including the positive electrode current collector plate 21 and the positive electrode terminal 41 .
  • the negative collector plate 22 and the negative terminal 42 are configured separately, but the negative collector plate 22 and the negative terminal 42 may be configured integrally. That is, the first current collector may have a configuration including the negative electrode current collector plate 22 and the negative electrode terminal 42 .

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

Une batterie (1) comprend : un premier collecteur de courant (par exemple, une feuille de collecteur de courant d'électrode positive (21)) ; un corps de charge/décharge (10) comprenant une languette d'électrode (par exemple, une languette d'électrode positive (11b)) stratifiée sur le premier collecteur de courant (par exemple, la feuille de collecteur de courant d'électrode positive (21)) ; et un second collecteur de courant (par exemple, un ruban d'électrode positive (23)) qui est stratifié sur la languette d'électrode (par exemple, la languette d'électrode positive (11b)) et qui a une capacité thermique supérieure à celle de la languette d'électrode (par exemple, la languette d'électrode positive (11b)). Le premier collecteur de courant (par exemple, la feuille de collecteur de courant d'électrode positive (21)), la languette d'électrode (par exemple, la languette d'électrode positive (11b)) et le second collecteur de courant (par exemple, le ruban d'électrode positive (23)) sont soudés.
PCT/JP2022/037869 2021-10-08 2022-10-11 Batterie et procédé de fabrication de batterie WO2023058778A1 (fr)

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JP2021-166495 2021-10-08

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006351376A (ja) * 2005-06-16 2006-12-28 Toyota Motor Corp 電池と電池製造方法
JP2016029627A (ja) * 2014-07-25 2016-03-03 株式会社豊田自動織機 蓄電装置及び蓄電装置の製造方法
WO2017110247A1 (fr) * 2015-12-21 2017-06-29 株式会社豊田自動織機 Ensemble d'électrode et procédé de fabrication de celui-ci
JP2019003837A (ja) * 2017-06-15 2019-01-10 株式会社豊田自動織機 電極組立体

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006351376A (ja) * 2005-06-16 2006-12-28 Toyota Motor Corp 電池と電池製造方法
JP2016029627A (ja) * 2014-07-25 2016-03-03 株式会社豊田自動織機 蓄電装置及び蓄電装置の製造方法
WO2017110247A1 (fr) * 2015-12-21 2017-06-29 株式会社豊田自動織機 Ensemble d'électrode et procédé de fabrication de celui-ci
JP2019003837A (ja) * 2017-06-15 2019-01-10 株式会社豊田自動織機 電極組立体

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