WO2021192664A1 - 二次電池 - Google Patents
二次電池 Download PDFInfo
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- WO2021192664A1 WO2021192664A1 PCT/JP2021/004624 JP2021004624W WO2021192664A1 WO 2021192664 A1 WO2021192664 A1 WO 2021192664A1 JP 2021004624 W JP2021004624 W JP 2021004624W WO 2021192664 A1 WO2021192664 A1 WO 2021192664A1
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- positive electrode
- current collector
- tab
- electrode body
- plate
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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
- H01M50/10—Primary casings; Jackets or wrappings
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
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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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
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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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/172—Arrangements of electric connectors penetrating the casing
- H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
- H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
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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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
- H01M50/184—Sealing members characterised by their shape or structure
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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
- H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
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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
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- H—ELECTRICITY
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- 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
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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
- H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
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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
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
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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
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/545—Terminals formed by the casing of the cells
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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
- H01M50/543—Terminals
- H01M50/547—Terminals characterised by the disposition of the terminals on the cells
- H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/552—Terminals characterised by their shape
- H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
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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
- H01M50/543—Terminals
- H01M50/564—Terminals characterised by their manufacturing process
- H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present disclosure relates to a secondary battery including an electrode body in which a band-shaped positive electrode plate and a band-shaped negative electrode plate are wound around a band-shaped separator.
- Patent Document 1 discloses a secondary battery including an electrode body in which a band-shaped positive electrode plate and a band-shaped negative electrode plate are wound around a band-shaped separator.
- one current collecting tab is provided for each circumference at one edge of the positive electrode plate in the winding axis direction and the other edge of the negative electrode plate in the winding axis direction.
- Patent Document 1 only one current collecting tab is provided on each circumference of the positive electrode plate and the negative electrode plate, and the distance from each part in the electrode plate to the current collecting tab varies widely. Therefore, the electrode plate The potential difference inside becomes large, and the deterioration of the electrode plate tends to progress. Therefore, the durability of the secondary battery is lowered.
- the secondary battery according to the present disclosure is a secondary battery including an electrode body in which a band-shaped positive electrode plate and a band-shaped negative electrode plate are wound around a band-shaped separator, and the positive electrode plate of the electrode body is wound.
- At least two current collecting tabs are provided on one edge in the rotation axis direction and on the other edge in the winding axis direction of the negative electrode plate for each circumference, and are provided on the positive electrode plate.
- the plurality of current collecting tabs include a plurality of types of current collecting tabs in which at least one of the protruding length and the width of the proximal end is different from each other.
- the plurality of current collecting tabs projecting from the negative electrode plate are characterized by including a plurality of types of current collecting tabs in which at least one of the protruding length and the width of the proximal end is different from each other.
- the durability of the secondary battery can be improved and the output current of the secondary battery can be increased.
- FIG. 1 is a perspective view showing a non-aqueous electrolyte secondary battery according to the embodiment of the present disclosure.
- FIG. 2 is a cross-sectional view taken along the line II-II of FIG.
- FIG. 3 is a diagram showing a sealing plate and a group of electrode bodies including a plurality of electrode bodies.
- FIG. 4 is a schematic plan view of the electrode body as viewed from the sealing plate side.
- FIG. 5 is a schematic plan view showing the electrode body in the unfolded state.
- FIG. 6 is a cross-sectional view taken along the line VI-VI of FIG. FIG.
- FIG. 7A is a perspective view of a sealing plate to which the positive electrode terminal, the first positive electrode current collector, the negative electrode terminal, and the first negative electrode current collector are attached, as viewed from the outer surface side of the battery.
- FIG. 7B is a perspective view of a sealing plate to which the positive electrode terminal, the first positive electrode current collector, the negative electrode terminal, and the first negative electrode current collector are attached, as viewed from the inner surface side of the battery.
- FIG. 8 is a view corresponding to FIG. 6 before bending the tip region of the positive electrode tab.
- FIG. 9 is a perspective view of the electrode body before bending the tip region of the positive electrode tab.
- FIG. 10A is a diagram showing a state in which the first positive electrode current collector and the first negative electrode current collector are arranged between the second positive electrode current collector and the second negative electrode current collector.
- FIG. 10B is a diagram showing a state in which the distance between the second positive electrode current collector and the second negative electrode current collector is reduced.
- FIG. 10C is a diagram showing a state after connecting the first positive electrode current collector and the second positive electrode current collector and connecting the first negative electrode current collector and the second negative electrode current collector.
- FIG. 11 is a developed view of the electrode body holder.
- FIG. 1 is a perspective view showing a non-aqueous electrolyte secondary battery 20 according to the present disclosure.
- FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
- the non-aqueous electrolyte secondary battery 20 is a battery composed of a bottomed square cylindrical outer body 1 having an opening and a sealing plate 2 for sealing the opening of the square outer body 1.
- a case 100 is provided.
- the square exterior body 1 and the sealing plate 2 are preferably made of metal, more preferably aluminum or iron, respectively.
- the square exterior body 1 has a bottom portion 1a, a pair of first side walls 1b and 1c, a second front side wall 1d, and a second rear side wall 1e.
- the pair of first side walls 1b and 1c are arranged so as to face each other in parallel.
- the second front side wall 1d and the second rear side wall 1e are arranged so as to face each other in parallel.
- the pair of first side walls 1b and 1c are perpendicular to the longitudinal direction of the sealing plate 2, and the area of the pair of first side walls 1b and 1c is smaller than the areas of the second front side wall 1d and the second rear side wall 1e.
- the electrode body 3 is a flat-shaped electrode body in which a positive electrode plate 4 and a negative electrode plate 5 are wound around a separator SP.
- the winding shaft of the electrode body 3 extends perpendicular to the first side wall 1b and 1c and parallel to the second front side wall 1d and the second rear side wall 1e.
- the thickness TH of the electrode body 3 is set to 12 mm.
- two positive electrode tabs 40a as current collecting tabs are integrally projected on one end edge of the positive electrode plate 4 of the electrode body 3 in the winding axis direction. They overlap each other.
- the positive electrode tab 40a is formed in a trapezoidal plate shape in which the width gradually increases from the tip end to the base end side. These plurality of positive electrode tabs 40a are laminated to form a positive electrode tab group 40.
- the center of the curved portion of the positive electrode plate 4 is indicated by reference numeral R.
- the plurality of positive electrode tabs 40a projecting from the positive electrode plate 4 include a plurality of types of positive electrode tabs 40a having different protrusion lengths and base end widths.
- the protruding length of the positive electrode tab 40a gradually increases toward the second rear side wall 1e side (one side in the thickness direction of the electrode body 3). Therefore, the protruding length L2 of the positive electrode tab 40a that protrudes most from the second rear side wall 1e side among all the positive electrode tabs 40a is the most protruding length L2 of the second front side wall 1d side (of the electrode body 3) of all the positive electrode tabs 40a.
- the positive electrode tab 40a that protrudes most from the second rear side wall 1e side among all the positive electrode tabs 40a is designated by reference numeral 401a, and the positive electrode tab 40a that protrudes most from the second front side wall 1d side among all the positive electrode tabs 40a.
- the positive electrode tab 40a is indicated by reference numeral 402a.
- the width TW of the base end of the positive electrode tab 40a is larger as the positive electrode tab 40a has a longer protruding length.
- the protrusion length L1 of the positive electrode tab 40a having the shortest protrusion length, that is, the positive electrode tab 402a located on the second front side wall 1d side is set to 12 mm, and the positive electrode tab 401a having the longest protrusion length, that is, the most.
- the protruding length L2 of the positive electrode tab 40a located on the second rear side wall 1e side is set to 21 mm.
- the vicinity of the tips of all the positive electrode tabs 40a are connected to each other by welding with their plate surfaces facing substantially the same direction to form a connecting portion 63.
- the connecting portion 63 is formed at a position slightly separated from the tips of all the positive electrode tabs 40a, but the tip portions of all the positive electrode tabs 40a may form the connecting portion 63.
- the positive electrode plate 4 has regions in which positive electrode active material layers 4a are formed on both sides of the positive electrode core body.
- the positive electrode tab 40a is composed of an exposed portion of the positive electrode core.
- a positive electrode protective layer 4b having a lower conductivity than the positive electrode active material layer 4a is provided at the root portion of the positive electrode tab 40a.
- the positive electrode protective layer 4b may be an insulating layer made of resin, a layer containing ceramic and a resin binder, or the like. Further, the positive electrode protective layer 4b may contain a conductive material such as a carbon material. It is not necessary to provide the positive electrode protective layer 4b.
- a negative electrode tab 50a as two current collecting tabs is projected on the edge of the negative electrode plate 5 of the electrode body 3 in the winding axis direction on the other side (anti-positive electrode tab 40a side).
- These negative electrode tabs 50a have a shape that is symmetrical with respect to the positive electrode tab 40a with the cross section at the center in the winding axis direction of the electrode body 3 as the center. Therefore, the plurality of negative electrode tabs 50a projecting from the negative electrode plate 5 include a plurality of types of negative electrode tabs 50a having different protrusion lengths and base end widths. These plurality of negative electrode tabs 50a are laminated to form the negative electrode tab group 50.
- the negative electrode plate 5 has regions in which negative electrode active material layers are formed on both sides of the negative electrode core body.
- the negative electrode tab 50a is composed of an exposed negative electrode core body.
- a positive electrode terminal 8 and a negative electrode terminal 9 as electrode terminals are attached to the sealing plate 2.
- the positive electrode terminal 8 is electrically connected to the positive electrode tab group 40 via the positive electrode current collector 6.
- the positive electrode current collector 6 is composed of one first positive electrode current collector 61 and three second positive electrode current collectors 62. Each of the three second positive electrode current collectors 62 corresponds to each electrode body 3.
- the negative electrode terminal 9 is electrically connected to the negative electrode tab group 50 via the negative electrode current collector 7.
- the negative electrode current collector 7 is a first negative electrode current collector 71 having the same shape as the first positive electrode current collector 61, and three second negative electrode current collectors 72 having the same shape as the second positive electrode current collector 62. It is configured.
- Each of the three second negative electrode current collectors 72 corresponds to each electrode body 3.
- the first positive electrode current collector 61 has a substantially L-shaped cross section and is arranged between the electrode body 3 and the sealing plate 2. The first positive electrode current collector 61 is connected to the positive electrode terminal 8.
- the second positive electrode current collector 62 is arranged between the electrode body 3 and the first side wall 1b of the square exterior body 1. Specifically, the second positive electrode current collector 62 has a substantially flat plate shape parallel to the first side wall 1b, and extends toward the bottom portion 1a along the first side wall 1b. The second positive electrode current collector 62 is connected to the first positive electrode current collector 61.
- the second positive electrode current collector 62 has a current collector connecting portion 62a, an inclined portion 62b, and a tab joint portion 62c.
- the current collector connecting portion 62a is connected to the first positive electrode current collector 61.
- the positive electrode tab group 40 is connected to the tab joint portion 62c.
- the inclined portion 62b connects the current collector connection portion 62a and the tab joint portion 62c so that the current collector connection portion 62a is located inside the winding axis direction of the electrode body 3 with respect to the tab joint portion 62c. , Inclined with respect to both.
- the inclined portion 62b forms a step between the current collector connecting portion 62a and the tab joint portion 62c.
- the plate surface of the current collector connecting portion 62a and the tab joining portion 62c is directed in the winding axis direction of the electrode body 3.
- the width W1 in the thickness direction of the electrode body 3 of the tab joint portion 62c of the second positive electrode current collector 62 is set to 10 mm.
- the current collector connecting portion 62a is provided with a recess 62d.
- the portion provided with the recess 62d is thinner than the periphery thereof.
- the recess 62d is provided with a through hole 62e. In the recess 62d, the current collector connecting portion 62a is joined to the first positive electrode current collector 61.
- the second negative electrode current collector 72 also has a current collector connecting portion 72a, an inclined portion 72b, and a tab joint portion 72c, as shown in FIG.
- the current collector connecting portion 72a is provided with a recess 72d and a through hole 72e.
- the first negative electrode current collector 71 and the second negative electrode current collector 72 are left and right with respect to the first positive electrode current collector 61 and the second positive electrode current collector 62 with the cross section at the center in the winding axis direction of the electrode body 3 as the center. They are arranged so as to be symmetrical.
- the distance DI1 between the electrode body 3 and the tab joint portion 62c of the second positive electrode current collector 62 in the winding axis direction of the electrode body 3 is 1/2 of the thickness TH of the electrode body 3. It is set to 5.0 mm, which is as follows.
- the tip region including the connection portion 63 of all the positive electrode tabs 40a configured as described above has its plate surface in the plate thickness direction of the tab joint portion 62c of the second positive electrode current collector 62. It is bent toward the second rear side wall 1e side (one in the thickness direction of the electrode body 3) so as to face. That is, the tips of all the positive electrode tabs 40a constituting the connecting portion 63 face the second rear side wall 1e side. Further, the connecting portion 63 is welded to the surface of the tab joint portion 62c of the second positive electrode current collector 62 on the electrode body 3 side.
- the width W2 of the electrode body 3 of the connecting portion 63 in the thickness direction is set to 3.0 mm.
- the tips of all the positive electrode tabs 40a constituting the connection portion 63 overlap the tab joint portion 62c and the tab joint portion 62c in the plate thickness direction. That is, the tips of all the positive electrode tabs 40a do not protrude from the tab joint 62c in the plate thickness direction of the tab joint 62c. Further, among all the tips of the positive electrode tabs 40a constituting the connecting portion 63, the tip located on one side in the thickness direction of the electrode body 3 and the tip located on the other side in the thickness direction of the electrode body 3 are the electrode bodies. The deviation of 3 in the thickness direction is 2.0 mm or less. It is preferable that the positions of the tips of all the positive electrode tabs 40a in the thickness direction of the electrode bodies 3 are the same.
- the connecting portion 63 is located closer to the second front side wall 1d (the other side in the thickness direction of the electrode body 3) than the center in the thickness direction of the electrode body 3.
- the negative electrode tab group 50 is also welded to the second negative electrode current collector 72 in the same manner as the positive electrode tab group 40.
- reference numeral 10 is an external insulating member arranged between the sealing plate 2 and the positive electrode terminal 8.
- Reference numeral 11 is an internal insulating member arranged between the sealing plate 2 and the first positive electrode current collector 61.
- Reference numeral 12 is an external insulating member arranged between the sealing plate 2 and the negative electrode terminal 9.
- Reference numeral 13 is an internal insulating member arranged between the sealing plate 2 and the first negative electrode current collector 71.
- Reference numeral 14 is a box-shaped or bag-shaped insulating sheet arranged inside the square exterior body 1 and accommodating the electrode body 3.
- Reference numeral 15 is an electrolytic solution injection hole provided in the sealing plate 2.
- Reference numeral 16 is a sealing member for sealing the electrolytic solution injection hole 15.
- Reference numeral 17 is a gas discharge valve provided on the sealing plate 2.
- the sealing plate 2 has a positive electrode terminal mounting hole near one end and a negative electrode terminal mounting hole near the other end.
- the external insulating member 10 is arranged on the outer surface side around the positive electrode terminal mounting hole of the sealing plate 2, and the internal insulating member 11 and the first positive electrode current collector 61 are arranged on the inner surface side around the positive electrode terminal mounting hole of the sealing plate 2.
- the positive electrode terminal 8 is inserted into the through hole of the external insulating member 10, the positive electrode terminal mounting hole of the sealing plate 2, the through hole of the internal insulating member 11, and the through hole of the first positive electrode current collector 61 from the outside of the battery. Insert and crimp the positive electrode terminal 8 onto the first positive electrode current collector 61. Further, it is more preferable to weld the crimped portion of the positive electrode terminal 8 to the first positive electrode current collector 61.
- the external insulating member 12 is arranged on the outer surface side around the negative electrode terminal mounting hole of the sealing plate 2, and the internal insulating member 13 and the first negative electrode current collector 71 are arranged on the inner surface side around the negative electrode terminal mounting hole of the sealing plate 2.
- the negative electrode terminal 9 is inserted into the through hole of the external insulating member 12, the negative electrode terminal mounting hole of the sealing plate 2, the through hole of the internal insulating member 13, and the through hole of the first negative electrode current collector 71 from the outside of the battery. Insert and crimp the negative electrode terminal 9 onto the first negative electrode current collector 71. Further, it is more preferable to weld the crimped portion of the negative electrode terminal 9 to the first negative electrode current collector 71.
- FIG. 7A and 7B are perspective views of the sealing plate 2 to which the positive electrode terminal 8, the first positive electrode current collector 61, the negative electrode terminal 9, and the first negative electrode current collector 71 are attached.
- FIG. 7A shows the outside side of the battery
- FIG. 7B shows the inside side of the battery.
- the first positive electrode current collector 61 has a first region 61a arranged along the sealing plate 2 and a second region 61b bent from the end of the first region 61a.
- the first region 61a is arranged between the sealing plate 2 and the electrode body 3.
- the second region 61b extends from the first region 61a toward the bottom 1a of the square exterior body 1.
- the second region 61b is arranged between the first side wall 1b of the square exterior body 1 and the electrode body 3.
- the first negative electrode current collector 71 has a first region 71a arranged along the sealing plate 2 and a second region 71b bent from the end of the first region 71a.
- the first region 71a is arranged between the sealing plate 2 and the electrode body 3.
- the second region 71b extends from the first region 71a toward the bottom portion 1a of the square exterior body 1.
- the second region 71b is arranged between the first side wall 1c of the square exterior body 1 and the electrode body 3.
- the second positive electrode current collector 62 which will be described later, is connected to the second region 61b, by gripping the notch portion 61c, more stable welding can be performed, and a higher quality connecting portion can be stabilized.
- the cutout portion 61c is preferably arranged on the bottom portion 1a side of the square exterior body 1 from the internal side insulating member 11 in the second region 61b.
- the cutout portion 61c is preferably provided in the vicinity of the end portion on the first region 61a side in the second region 61b.
- the second region 71b of the first negative electrode current collector 71 is also preferably provided with notches 71c at both ends in the width direction.
- the cutout portion 61c preferably has a region not covered by the wall portion of the inner side insulating member 11.
- the positive electrode terminal 8 and the first positive electrode current collector 61 are preferably made of metal, and more preferably made of aluminum.
- the negative electrode terminal 9 and the first negative electrode current collector 71 are preferably made of metal, more preferably copper.
- the negative electrode terminal 9 can include a region made of aluminum and a region made of copper. In this case, it is preferable to connect the region made of copper to the first negative electrode current collector 71 made of copper and expose the region made of aluminum to the outside of the battery.
- Lithium nickel cobalt manganese composite oxide as a positive electrode active material, polyvinylidene fluoride (PVdF) as a binder, carbon material as a conductive material, and N-methyl-2-pyrrolidone (NMP) as a dispersion medium are lithium nickel.
- the cobalt manganese composite oxide: PVdF: carbon material is kneaded so as to have a mass ratio of 97.5: 1: 1.5 to prepare a positive electrode active material layer slurry.
- PVdF polyvinylidene fluoride
- NMP N-methyl-2-pyrrolidone
- the positive electrode active material layer slurry and the positive electrode protective layer slurry prepared by the above method are applied to both sides of the aluminum foil as the positive electrode core by a die coater. At this time, the positive electrode active material layer slurry is applied to the center of the positive electrode core in the width direction. Further, the positive electrode protective layer slurry is applied to the end portion in the width direction of the region to which the positive electrode active material layer slurry is applied.
- the positive electrode core body coated with the positive electrode active material layer slurry and the positive electrode protective layer slurry is dried to remove NMP contained in the positive electrode active material layer slurry and the positive electrode protective layer slurry. As a result, the positive electrode active material layer and the positive electrode protective layer are formed. Then, the positive electrode active material layer is compressed to obtain a positive electrode original plate.
- This positive electrode original plate is cut into a predetermined shape to obtain a positive electrode plate 4.
- the positive electrode original plate can be cut by irradiating an energy ray such as a laser, a mold, or a cutter.
- the negative electrode active material layer slurry prepared by the above method is applied to both sides of the copper foil as the negative electrode core by a die coater.
- the negative electrode core body coated with the negative electrode active material layer slurry is dried to remove the water contained in the negative electrode active material layer slurry. As a result, the negative electrode active material layer is formed. Then, the negative electrode active material layer is compressed to obtain a negative electrode original plate.
- This negative electrode original plate is cut into a predetermined shape to obtain a negative electrode plate 5.
- the negative electrode original plate can be cut by irradiating an energy ray such as a laser, a mold, or a cutter.
- the strip-shaped positive electrode plate 4 and the strip-shaped negative electrode plate 5 produced by the above method are wound via a polyolefin strip-shaped separator SP to prepare a flat wound-shaped electrode body 3.
- the electrode body 3 has a flat region in the center, and curved portions at both ends of the flat region.
- a positive electrode tab group 40 in which a plurality of positive electrode tabs 40a are laminated is provided at one end of the electrode body 3 in the direction in which the winding axis extends.
- a negative electrode tab group 50 in which a plurality of negative electrode tabs 50a are laminated is provided at the other end of the electrode body 3 in the direction in which the winding shaft extends.
- the center of the positive electrode tab group 40 and the center of the negative electrode tab group 50 are located in a direction perpendicular to the direction in which the winding axis of the electrode body 3 extends and in a direction perpendicular to the thickness direction of the electrode body 3. It is arranged so as to be offset from the winding axis to one side.
- the positive electrode tab 40a and / or the negative electrode tab 50a By making the shape of the positive electrode tab 40a and / or the negative electrode tab 50a in a plan view gradually increasing from the tip to the root, an impact or vibration is applied to the non-aqueous electrolyte secondary battery 20. Even in this case, the positive electrode tab 40a and / or the negative electrode tab 50a can be made less likely to be damaged. Further, it is more effective to make the corner portion of the root portion R-shaped.
- the tip regions of all the positive electrode tabs 40a are connected to the tab joint 62c of the second positive electrode current collector 62.
- the second positive electrode current collector 62 is formed by applying the welding jig T to a position slightly lower than the tips of all the positive electrode tabs 40a to perform welding. Weld to.
- a portion slightly lower than the tips of all the positive electrode tabs 40a constitutes the connecting portion 63.
- the connecting portions 63 may be formed at the tips of all the positive electrode tabs 40a.
- the tab joint portion 62c of the second positive electrode current collector 62 has its plate surface oriented in the thickness direction of the electrode body 3. Further, the tip regions of all the positive electrode tabs 40a are oriented so that the plate surface faces the thickness direction of the electrode body 3 and is closer to the positive electrode tab 40a side (one end side in the thickness direction of the electrode body 3) having the shortest protruding length. It is piled up in a state of being piled up. At this time, the distance DI2 between the electrode body 3 and the tab joint portion 62c of the second positive electrode current collector 62 is set to 6 mm, and all the positive electrode tabs 40a are bent.
- the connection portion 63 is connected to the root side (in FIG. 8) of the positive electrode tab group 40 in the width direction of the tab joint portion 62c (left-right direction in FIG. 8). It is preferable to arrange them closer to the left side). With such a configuration, when the positive electrode tab group 40 is bent, a curved shape can be more reliably formed in the vicinity of the root of the positive electrode tab group 40. As a result, damage to the positive electrode tab group 40 can be suppressed. Further, even if the positive electrode tab 40a is misaligned, the positive electrode tab group 40 and the tab joint portion 62c can be stably joined.
- the lower end portion of the second positive electrode current collector 62 (the portion serving as the end portion on the bottom portion 1a side of the square exterior body 1) is the lower end portion of the positive electrode tab group 40 (the end portion on the bottom portion 1a side of the square exterior body 1). It is preferable that it is located below the portion). With such a configuration, in the step of bending the positive electrode tab group 40, which will be described later, the positive electrode tab group 40 can be bent more reliably and stably.
- the tip regions of all the positive electrode tabs 40a are oriented so that the plate surface thereof is in the substantially winding axis direction of the electrode body 3 (for example, the tab joint portion 62c with respect to the winding axis). Bend to a state where the inclination of is less than ⁇ 15 °). As a result, the tab joint portion 62c of the second positive electrode current collector 62 is in a state in which the plate surface thereof is oriented in the substantially winding axis direction of the electrode body 3. In this way, the positive electrode tab group 40 can be bent without bending the second positive electrode current collector 62.
- the negative electrode tab 50a is also attached to the second negative electrode current collector 72 in the same manner as the positive electrode tab 40a.
- Electrode body group As shown in FIG. 3, a plurality of electrode bodies 3 in which the positive electrode tab group 40 and the negative electrode tab group 50 are each bent are laminated and fixed by electrode body fixing means such as tape. Each positive electrode tab group 40 is arranged on the same side, and each negative electrode tab group 50 is arranged on the same side. Further, in each electrode body 3, the positive electrode tab group 40 is bent in the same direction. In each electrode body 3, the negative electrode tab group 50 is bent in the same direction.
- the second positive electrode current collectors 62 attached to the electrode bodies 3 are arranged at intervals and connected to the second region 61b of the first positive electrode current collector 61. The same applies to each second negative electrode current collector 72.
- the second region 61b of the first positive electrode current collector 61 is arranged inside the current collector connection portion 62a of the second positive positive collector 62, and the second region 71b of the first negative negative current collector 71 is the second negative negative collector. It is arranged inside the current collector connecting portion 72a of the electric body 72. Then, the second region 61b of the first positive electrode current collector 61 and the current collector connecting portion 62a of the second positive electrode current collector 62 are joined. Further, the second region 71b of the first negative electrode current collector 71 is joined to the current collector connecting portion 72a of the second negative electrode current collector 72.
- ultrasonic welding ultrasonic bonding
- resistance welding welding by irradiation with high energy rays such as a laser, or the like
- welding by irradiating a high energy ray such as a laser.
- 10A to 10C show the second region 61b of the first positive electrode current collector 61, the second region 71b of the first negative electrode current collector 71, and the current collector connection portion 62a of the second positive electrode current collector 62 at each stage. , And a cross-sectional view of the current collector connection portion 72a of the second negative electrode current collector 72 along the winding axis of the electrode body 3.
- the second of the first positive electrode current collector 61 is between the current collector connection portion 62a of the second positive electrode current collector 62 and the current collector connection portion 72a of the second negative electrode current collector 72.
- the region 61b and the second region 71b of the first negative electrode current collector 71 are arranged.
- the distance D1 between the inner surface of the current collector connecting portion 62a and the inner surface of the current collector connecting portion 72a is preferably larger than the distance D2 between the outer surface of the second region 61b and the outer surface of the second region 71b.
- D1 is preferably 0.1 to 5 mm larger than D2, and more preferably 0.2 to 3 mm larger.
- the current collector connection portion 62a and / or the current collector connection portion 72a is displaced inward so that the distance between the current collector connection portion 62a and the current collector connection portion 72a becomes small.
- the distance D1 between the inner surface of the current collector connecting portion 62a and the inner surface of the current collector connecting portion 72a is changed to D1'.
- the difference between D2 and D1' is preferably 0 to 0.2 mm.
- a joint portion 64 which is a welded portion between the second region 61b and the current collector connecting portion 62a, is formed in the recess 62d.
- a joint portion 74 which is a welded portion between the second region 71b and the current collector connecting portion 72a, is formed in the recess 72d.
- the first positive electrode current collector 61 and the second positive electrode current collector 62, and the first negative electrode current collector 71 and the second negative electrode current collector 72 can be performed by a simpler method. , Can be welded more stably. Therefore, the highly reliable joint portion 64 and the joint portion 74 can be formed.
- the portion where the recesses 62d and 72d are formed is a portion thinner than the periphery thereof.
- a higher quality joint portion can be formed more stably. Therefore, it becomes a more reliable secondary battery.
- the through hole 62e to measure the presence or absence of a gap between the second region 61b and the current collector connecting portion 62a or the size of the gap, the second region 61b and the current collector connecting portion can be more stably measured.
- 62a can be joined by welding. The same applies to the through hole 72e.
- FIG. 3 is a perspective view showing a state after connecting the first positive electrode current collector 61 and the second positive electrode current collector 62, and the first negative electrode current collector 71 and the second negative electrode current collector 72, respectively.
- FIG. 11 is a developed view of the electrode body holder 14.
- the insulating sheet constituting the electrode body holder 14 is bent at the portion indicated by the broken line to form a box-shaped electrode body holder 14.
- the electrode body holder 14 includes a holder bottom 14a, a holder first main surface 14b, a holder second main surface 14c, a holder first side surface 14d, a holder second side surface 14e, a holder third side surface 14f, a holder fourth side surface 14g, and a holder first. It has 5 side surfaces 14h and a holder 6th side surface 14i.
- the electrode body holder 14 When the electrode body holder 14 has a box shape, it has a region where the holder first side surface 14d, the holder second side surface 14e, and the holder third side surface 14f overlap, and the holder fourth side surface 14g, the holder fifth side surface 14h, and the holder The sixth side surface 14i has an overlapping region.
- the present embodiment since two positive electrode tabs 40a are provided on each circumference of the positive electrode plate 4, compared to the case where only one positive electrode tab 40a is provided on each circumference of the positive electrode plate 4, the inside of the positive electrode plate 4 is provided.
- the variation in the distance from each portion to the positive electrode tab 40a can be reduced, and the potential difference in the positive electrode plate 4 can be reduced. Therefore, deterioration of the positive electrode plate 4 can be suppressed, and the durability of the non-aqueous electrolyte secondary battery 20 can be enhanced.
- the current collecting resistance of the positive electrode plate 4 can be reduced, so that the output current of the non-aqueous electrolyte secondary battery 20 can be increased.
- the negative electrode tabs 50a are provided from each portion in the negative electrode plate 5 as compared with the case where only one negative electrode tab 50a is provided on each circumference of the negative electrode plate 5.
- the variation in the distance to the negative electrode plate 5 can be reduced, and the potential difference in the negative electrode plate 5 can be reduced. Therefore, deterioration of the negative electrode plate 5 can be suppressed, and the durability of the non-aqueous electrolyte secondary battery 20 can be enhanced.
- the current collecting resistance of the negative electrode plate 5 can be reduced, so that the output current of the non-aqueous electrolyte secondary battery 20 can be increased.
- the tips of all the positive electrode tabs 40a constituting the connection portion 63 are overlapped with the tab joint portion 62c in the plate thickness direction of the tab joint portion 62c, the tips of the positive electrode tabs 40a protrude from the tab joint portion 62c and are adjacent to each other. It is possible to prevent the electrode body 3 from coming into contact with the electrode body 3. Further, since it is not necessary to provide a restricting member such as a tape in order to restrict the portion of the positive electrode tab 40a protruding from the tab joint portion 62c from coming into contact with the adjacent electrode body 3, compared to the case where the restricting member is provided. It is possible to reduce the number of parts and eliminate the trouble of assembling the regulatory member.
- the tip located on one side in the thickness direction of the electrode body 3 and the tip located on the other side in the thickness direction of the electrode body 3 are the electrode bodies. Since the deviation of 3 in the thickness direction is 2.0 mm or less, the welding operation of welding the positive electrode tab 40a to the second positive electrode current collector 62 becomes easier than in the case where the deviation exceeds 2.0 mm. Similarly, the welding operation of welding the negative electrode tab 50a to the second negative electrode current collector 72 becomes easy.
- the protruding length L2 of the positive electrode tab 40a protruding most from the second rear side wall 1e side is set to the protruding length L2 of all the positive electrode tabs 40a constituting the connecting portion 63. Since the protrusion length L1 of the positive electrode tab 40a protruding from the second front side wall 1d side is longer than the protrusion length L1, even if the connecting portion 63 is arranged closer to the second front side wall 1d than the center in the thickness direction of the electrode body 3.
- the deviation in the thickness direction of the electrode body 3 between the tip of the positive electrode tab 40a protruding from the second rear side wall 1e side and the tip of the positive electrode tab 40a protruding from the second front side wall 1d side can be reduced.
- the same effect can be obtained for the negative electrode tab 50a.
- the connecting portion 63 is made of the electrode body 3 rather than the center in the thickness direction of the electrode body 3. Even if it is arranged closer to the second front side wall 1d, the deviation in the thickness direction of the electrode bodies 3 at the tips of all the positive electrode tabs 40a can be reduced. The same effect can be obtained for the negative electrode tab 50a.
- the width TW of the base end of the positive electrode tab 40a constituting the connecting portion 63 is increased by the length of the positive electrode tab 40a having a longer protrusion length, the width TW of the base end of the positive electrode tab 40a is made equal to each other.
- the resistance of the positive electrode tab 40a having a long protrusion length is not increased, and the current flowing through the positive electrode tab 40a can be made uniform regardless of the protrusion length. The same effect can be obtained for the negative electrode tab 50a.
- the positive electrode current collector 6 includes the first positive electrode current collector 61 and the second positive electrode current collector 62, the positive electrode current collector 6 is not bent when the positive electrode tab group 40 is bent. , The positive electrode tab group 40 can be bent, and a secondary battery having a higher volume energy density can be obtained more stably by a simpler method. Even when the number of electrode bodies 3 housed in the battery case 100 is larger than two, a highly reliable secondary battery can be stably manufactured without making the positive electrode current collector 6 a complicated shape. .. Therefore, the degree of freedom regarding the number of electrode bodies 3 housed in the battery case 100 is improved.
- the tab joint portion 62c of the second positive electrode current collector 62 is arranged on the first side wall 1b side of the square exterior body 1 with respect to the current collector connection portion 62a of the second positive electrode current collector 62.
- the positive electrode tab group 40 is preferably closer to the sealing plate 2. As a result, the conductive path from the positive electrode tab group 40 to the positive electrode terminal 8 can be shortened, and the non-aqueous electrolyte secondary battery 20 having a small internal resistance is obtained.
- the negative electrode tab group 50 is preferably closer to the sealing plate 2. As a result, the conductive path from the negative electrode tab group 50 to the negative electrode terminal 9 can be shortened, and the non-aqueous electrolyte secondary battery 20 having a small internal resistance is obtained.
- the electrode body holder 14 It is preferable to arrange another insulating member. Further, an electrode body holder is located between the region where the second region 71b of the first negative electrode current collector 71 and the current collector connecting portion 72a of the second negative electrode current collector 72 overlap and the first side wall 1c of the square exterior body 1. It is preferable to arrange an insulating member different from 14. With such a configuration, even when an impact or vibration is applied to the non-aqueous electrolyte secondary battery 20, it is possible to prevent damage to the joint between the members, the positive electrode tab group 40, or the negative electrode tab group 50.
- the present invention is applied to the non-aqueous electrolyte secondary battery 20 having three electrode bodies 3, but the present invention is not provided with a plurality of or only one electrode body 3. It can also be applied to the water electrolyte secondary battery 20.
- two positive electrode tabs 40a are provided for each circumference at one end edge of the positive electrode plate 4 of the electrode body 3 in the winding axis direction, but at least two positive electrode tabs 40a are provided for each circumference. It may be provided, and three or more positive electrode tabs 40a may be provided for each circumference.
- at least two negative electrode tabs 50a may be provided on the other edge of the negative electrode plate 5 in the winding axis direction (on the anti-positive electrode tab 40a side) for each circumference, and three or more negative electrodes may be provided for each circumference.
- a tab 50a may be provided.
- the plurality of positive electrode tabs 40a projecting from the positive electrode plate 4 include a plurality of types of positive electrode tabs 40a having different protrusion lengths and base end widths, but the positive electrode plate 4 includes.
- the plurality of positive electrode tabs 40a provided may include a plurality of types of positive electrode tabs 40a in which only one of the protruding length and the width of the proximal end is different from each other.
- the width of the base end of all the positive electrode tabs 40a may be the same.
- the plurality of negative electrode tabs 50a projecting from the negative electrode plate 5 may include a plurality of types of negative electrode tabs 50a in which only one of the protruding length and the width of the proximal end is different from each other.
- Non-aqueous electrolyte secondary battery 40a Positive electrode tab (collection tab) 50a Negative electrode tab (current collector tab) 61 1st positive electrode current collector 61a 1st region 61b 2nd region 62 2nd positive electrode current collector 62c Tab joint 63 Connection part 71 1st negative electrode current collector 71a 1st region 71b 2nd region 72 2nd negative electrode current collector Body 72c Tab joint SP Separator L1, L2 Projection length DI1 Interval TH Thickness TW Width
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Abstract
Description
前記負極板に突設された複数の前記集電タブは、突出長さ、及び基端の幅の少なくとも一方が互いに異なる複数種類の集電タブを含むことを特徴とする。
封口板2は、一方の端部近傍に正極端子取り付け孔を有し、他方の端部近傍に負極端子取り付け孔を有する。封口板2の正極端子取り付け孔の周囲の外面側に外部側絶縁部材10を配置し、封口板2の正極端子取り付け孔の周囲の内面側に内部側絶縁部材11及び第1正極集電体61を配置する。そして、電池外部側から正極端子8を、外部側絶縁部材10の貫通孔、封口板2の正極端子取り付け孔、内部側絶縁部材11の貫通孔、及び第1正極集電体61の貫通孔に挿入し、正極端子8を第1正極集電体61上にカシメる。更に、正極端子8においてカシメられた部分を、第1正極集電体61に溶接することがより好ましい。
まず、正極板の製造方法を説明する。
正極活物質としてのリチウムニッケルコバルトマンガン複合酸化物、結着材としてのポリフッ化ビニリデン(PVdF)、導電材としての炭素材料、及び分散媒としてのN-メチル-2-ピロリドン(NMP)をリチウムニッケルコバルトマンガン複合酸化物:PVdF:炭素材料の質量比が97.5:1:1.5となるように混練し、正極活物質層スラリーを作製する。
アルミナ粉末、導電材としての炭素材料、結着材としてのポリフッ化ビニリデン(PVdF)と分散媒としてのN-メチル-2-ピロリドン(NMP)を、アルミナ粉末:炭素材料:PVdFの質量比が83:3:14となるように混練し、保護層スラリーを作製する。
正極芯体としてアルミニウム箔の両面に、上述の方法で作製した正極活物質層スラリー及び正極保護層スラリーをダイコータにより塗布する。このとき、正極芯体の幅方向の中央に正極活物質層スラリーが塗布される。また、正極活物質層スラリーが塗布される領域の幅方向の端部に正極保護層スラリーが塗布される。
次に、負極板の製造方法を説明する。
負極活物質としての黒鉛、結着材としてのスチレンブタジエンゴム(SBR)及びカルボキシメチルセルロース(CMC)、及び分散媒としての水を、黒鉛:SBR:CMCの質量比が98:1:1となるように混練し、負極活物質層スラリーを作製する。
負極芯体としての銅箔の両面に、上述の方法で作製した負極活物質層スラリーをダイコータにより塗布する。
上述の方法で作製した帯状の正極板4及び帯状の負極板5を、ポリオレフィン製の帯状のセパレータSPを介して巻回し、扁平状の巻回型の電極体3を作製する。電極体3は中央に扁平状の領域を有し、扁平状の領域の両端に湾曲部を有する。
上述のように構成された非水電解質二次電池20を製造するには、図8に示すように、すべての正極タブ40aの先端領域を、第2正極集電体62のタブ接合部62cに重ねた状態で、すべての正極タブ40aの先端よりも若干下がった位置に溶接治具Tを当てて溶接を行うことにより、すべての正極タブ40aを互いに接合するとともに、第2正極集電体62に溶接する。これにより、すべての正極タブ40aの先端よりも若干下がった部分が、接続部63を構成する。なお、すべての正極タブ40aの先端部に溶接治具Tを当てて溶接を行うことにより、すべての正極タブ40aの先端部で接続部63が構成されるようにしてもよい。このとき、図9にも示すように、第2正極集電体62のタブ接合部62cは、その板面を電極体3の厚さ方向に向けている。また、すべての正極タブ40aの先端領域は、その板面を電極体3の厚さ方向に向け、かつ最も突出長さの短い正極タブ40a側(電極体3の厚さ方向一端側)に寄せた状態で重ねられている。また、このとき、電極体3と第2正極集電体62のタブ接合部62cとの間隔DI2は、6mmに設定され、全ての正極タブ40aが撓んでいる。
図3に示すように、正極タブ群40及び負極タブ群50がそれぞれ折り曲げられた状態の複数の電極体3を積層し、テープ等の電極体固定手段で固定する。各正極タブ群40は同じ側に配置され、各負極タブ群50は同じ側に配置される。また、各電極体3において、正極タブ群40はそれぞれ同じ方向に折り曲げられている。各電極体3において、負極タブ群50はそれぞれ同じ方向に折り曲げられている。
第1正極集電体61の第2領域61bを第2正極集電体62の集電体接続部62aの内側に配置し、第1負極集電体71の第2領域71bを第2負極集電体72の集電体接続部72aの内側に配置する。そして、第1正極集電体61の第2領域61bと第2正極集電体62の集電体接続部62aを接合する。また、第1負極集電体71の第2領域71bを第2負極集電体72の集電体接続部72aに接合する。接合方法としては、超音波溶接(超音波接合)、抵抗溶接、レーザー等の高エネルギー線の照射による溶接等を用いることができる。特にレーザー等の高エネルギー線の照射による溶接を用いることが好ましい。
図11は、電極体ホルダー14の展開図である。図11において破線の部分で電極体ホルダー14を構成する絶縁シートを折り曲げることにより箱状の電極体ホルダー14とする。電極体ホルダー14は、ホルダー底部14a、ホルダー第1主面14b、ホルダー第2主面14c、ホルダー第1側面14d、ホルダー第2側面14e、ホルダー第3側面14f、ホルダー第4側面14g、ホルダー第5側面14h、ホルダー第6側面14iを有する。
上述の実施形態は本願発明の例示であって、本願発明はこれらの例に限定されず、これらの例に周知技術や慣用技術、公知技術を組み合わせたり、一部置き換えたりしてもよい。また当業者であれば容易に思いつく改変発明も本願発明に含まれる。
1b,1c 第1側壁
2 封口板
3 電極体
4 正極板
5 負極板
8 正極端子
9 負極端子
20 非水電解質二次電池
40a 正極タブ(集電タブ)
50a 負極タブ(集電タブ)
61 第1正極集電体
61a 第1領域
61b 第2領域
62 第2正極集電体
62c タブ接合部
63 接続部
71 第1負極集電体
71a 第1領域
71b 第2領域
72 第2負極集電体
72c タブ接合部
SP セパレータ
L1,L2 突出長さ
DI1 間隔
TH 厚さ
TW 幅
Claims (7)
- 帯状の正極板と帯状の負極板とが帯状のセパレータを介して巻回された電極体を備えた二次電池であって、
前記電極体の正極板の巻回軸方向一方の端縁、及び前記負極板の巻回軸方向他方の端縁には、各周毎に、少なくとも2つの集電タブが突設されており、
前記正極板に突設された複数の前記集電タブは、突出長さ、及び基端の幅の少なくとも一方が互いに異なる複数種類の集電タブを含み、
前記負極板に突設された複数の前記集電タブは、突出長さ、及び基端の幅の少なくとも一方が互いに異なる複数種類の集電タブを含むことを特徴とする二次電池。 - 請求項1に記載の二次電池において、
開口、及び互いに対向するように配置された一対の側壁を有する外装体と、
前記開口を封口する封口板と、
前記封口板に取り付けられた端子とをさらに備え、
前記電極体は、扁平形状をなし、その巻回軸方向を前記側壁に対して垂直に向けた状態で前記外装体に収容され、
前記集電タブと前記端子とは、第1集電体及び第2集電体により電気的に接続され、
前記第1集電体は、前記封口板と前記電極体との間に配置された第1領域と、前記第1領域の端部から折れ曲がり一方の前記側壁と前記電極体との間に配置された第2領域とを含み、
前記第2集電体は、その板面を前記電極体の巻回軸方向に向けた板状のタブ接合部を有し、
複数の前記集電タブの先端部又は先端近傍は、その板面を略等しい方向に向けて互いに接合され、かつ前記第2集電体のタブ接合部の電極体側の面に溶接された接続部を構成し、
複数の前記集電タブの前記接続部を含む先端領域は、その板面を前記第2集電体のタブ接合部の板厚方向に向けるように前記電極体の厚さ方向一方に折り曲げられ、
前記接続部を構成する全ての集電タブの先端は、前記タブ接合部と当該タブ接合部の板厚方向に重なり、
前記第2集電体は、前記第1集電体の第2領域に溶接されていることを特徴とする二次電池。 - 請求項2に記載の二次電池において、
前記接続部を構成する全ての集電タブの先端のうち、最も前記電極体の厚さ方向一方に位置する先端と、最も前記電極体の厚さ方向他方に位置する先端との前記電極体の厚さ方向のずれが、2.0mm以下であることを特徴とする二次電池。 - 請求項2又は3に記載の二次電池において、
前記接続部を構成する全ての集電タブのうち、最も前記電極体の厚さ方向一方側から突出する集電タブの突出長さは、前記接続部を構成する全ての集電タブのうち、最も前記電極体の厚さ方向他方側から突出する集電タブの突出長さよりも長く、
前記接続部は、前記電極体の厚さ方向中央よりも前記電極体の前記厚さ方向他方寄りに位置していることを特徴とする二次電池。 - 請求項4に記載の二次電池において、
前記接続部を構成する集電タブの突出長さは、前記電極体の前記厚さ方向一方側に向かって徐々に長くなっていることを特徴とする二次電池。 - 請求項4又は5に記載の二次電池において、
前記接続部を構成する集電タブの基端の幅は、突出長さが長い集電タブ程、大きいことを特徴とする二次電池。 - 請求項4~6のいずれか1項に記載の二次電池において、
前記電極体と前記第2集電体のタブ接合部との前記巻回軸方向の間隔は、前記電極体の厚さの1/2以下に設定されていることを特徴とする二次電池。
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| EP4187664A1 (en) * | 2021-11-26 | 2023-05-31 | Prime Planet Energy & Solutions, Inc. | Battery |
| JP2023078785A (ja) * | 2021-11-26 | 2023-06-07 | プライムプラネットエナジー&ソリューションズ株式会社 | 電池 |
| WO2023123274A1 (zh) * | 2021-12-30 | 2023-07-06 | 宁德时代新能源科技股份有限公司 | 极片、电极组件、电池、用电装置及极片的制作方法 |
| EP4386969A4 (en) * | 2021-10-15 | 2025-05-07 | LG Energy Solution, Ltd. | Electrode assembly, cylindrical battery cell and battery pack, and vehicle therewith |
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| EP4131529A4 (en) | 2024-06-05 |
| JP7715705B2 (ja) | 2025-07-30 |
| JPWO2021192664A1 (ja) | 2021-09-30 |
| EP4131529A1 (en) | 2023-02-08 |
| US20230238564A1 (en) | 2023-07-27 |
| CN115280589B (zh) | 2024-06-14 |
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