WO2013164916A1 - 扁平捲回形二次電池およびその製造方法 - Google Patents
扁平捲回形二次電池およびその製造方法 Download PDFInfo
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- WO2013164916A1 WO2013164916A1 PCT/JP2013/050929 JP2013050929W WO2013164916A1 WO 2013164916 A1 WO2013164916 A1 WO 2013164916A1 JP 2013050929 W JP2013050929 W JP 2013050929W WO 2013164916 A1 WO2013164916 A1 WO 2013164916A1
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- separator
- winding
- secondary battery
- peripheral surface
- extension portion
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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
- H01M10/0404—Machines for assembling batteries
- H01M10/0409—Machines for assembling batteries for cells with wound 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
- H01M10/05—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
- H01M50/50—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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- 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
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49108—Electric battery cell making
Definitions
- the present invention relates to a high-capacity flat wound secondary battery, for example, for in-vehicle use and a method for manufacturing the same.
- Lithium ion secondary batteries have been used for more applications as performance is improved, and there has been a demand for simplification of the manufacturing process and cost reduction. Under such circumstances, for example, a technique is disclosed in which a shaft core for winding an electrode is a seamless cylinder made of stainless steel or synthetic resin, and the ring-shaped shaft core is crushed together with the wound electrode body after winding (Patent Document 1). ).
- the present invention provides a flat wound secondary battery capable of simplifying the manufacturing process with a simple structure and suppressing wrinkles generated on the electrode due to the unevenness of the welded portion, and a method for manufacturing the same. It is an object.
- the present invention includes a plurality of means for solving the above-described problems.
- a wound electrode body in which a positive electrode and a negative electrode are wound flatly around an axis with a separator interposed therebetween.
- the axial core is formed by winding a resin sheet having a higher bending rigidity than any of the positive electrode, the negative electrode, and the separator, and forms the innermost circumference of the axial core.
- the separator has an innermost peripheral part and an extension part extended toward the end of the winding end from the innermost peripheral part, and the separator has a joint part joined to the extension part, and an axial core continuous to the joint part. It is characterized by having a separator winding part around which only the separator is wound around.
- a manufacturing process can be simplified with a simple structure, and a highly reliable flat wound secondary battery and a manufacturing method thereof can be provided. Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.
- FIG. 1 is an external perspective view of a lithium ion secondary battery according to a first embodiment.
- FIG. 3 is an exploded perspective view of the power generation element assembly shown in FIG. 2.
- FIG. 4 is a developed perspective view of the wound electrode body shown in FIG. 3. It is a figure explaining the structure of an axial center, and is the schematic diagram which shows the state seen from the B direction of FIG. 4A. The figure which shows the state which crushed the axial center. The figure which showed the positional relationship of the resin sheet, separator, negative electrode plate, and positive electrode plate in the beginning of winding.
- the block diagram of a winding apparatus The schematic diagram explaining the state which wound the resin sheet around the winding core.
- the cross-sectional conceptual diagram which shows the junction structure of the axial center and separator in 1st Embodiment.
- Sectional conceptual diagram which shows an example of the joining method of the shaft core and separator in 1st Embodiment.
- Sectional conceptual diagram which shows the joining structure of the shaft core and separator in 2nd Embodiment.
- Sectional conceptual diagram which shows the joining method of the shaft core and separator in 2nd Embodiment.
- Sectional conceptual diagram which shows the junction structure of the shaft core and separator in 3rd Embodiment.
- Sectional conceptual diagram which shows the joining structure of the shaft core and separator in 4th Embodiment. The figure explaining the winding method with respect to the axial center in 5th Embodiment. Sectional conceptual diagram which shows the junction structure of the shaft core and separator in 5th Embodiment.
- the present invention is a flat wound secondary battery having a wound electrode body in which a positive electrode and a negative electrode are wound flatly around an axial core with a separator interposed between the positive electrode and the negative electrode. It is made by winding a resin sheet with higher bending rigidity than both the negative electrode and the separator, and is extended to the innermost peripheral part forming the innermost periphery of the shaft core and toward the end of the winding end from the innermost peripheral part.
- the separator has a joint part joined to the extension part, and a separator winding part that is wound around the shaft continuously around the axis one or more times around the joint part. It is a feature.
- FIG. 1 is an external perspective view of a lithium ion secondary battery according to this embodiment
- FIG. 2 is an exploded perspective view of the lithium ion secondary battery shown in FIG.
- the lithium ion secondary battery 1 has a configuration in which a wound electrode body 3 is accommodated in a battery container 2.
- the battery container 2 includes a battery can 11 having an opening 11 a and a battery lid 21 that seals the opening 11 a of the battery can 11.
- the wound electrode body 3 is wound around the core 110 of the winding device 100 in a state where the separators 33 and 35 are interposed between the positive electrode plate 34 and the negative electrode plate 32. It has a structure wound around the resin sheet 81 in a flat shape.
- the wound electrode body 3 is accommodated in the battery container 2 in a state where a sheet-like insulating protective film 41 is disposed around the wound electrode body 3.
- the battery container 2 includes a battery can 11 and a battery lid 21.
- the battery can 11 and the battery lid 21 are both made of an aluminum alloy, and the battery lid 21 is welded to the battery can 11 by laser welding.
- the battery container 2 includes a pair of wide side surfaces PW, a pair of narrow side surfaces PN, a bottom surface PB, and a battery lid 21 to form a rectangular parallelepiped flat rectangular container.
- the battery lid 21 is provided with a positive electrode terminal 51 and a negative electrode terminal 61 (a pair of electrode terminals) via an insulating member, and constitutes the lid assembly 4.
- the battery lid 21 has a gas discharge valve 71 that is opened when the pressure in the battery container 2 rises above a predetermined value and discharges the gas in the battery container 2;
- a liquid injection port 72 for injecting an electrolytic solution into the battery container 2 is disposed.
- the positive electrode terminal 51 and the negative electrode terminal 61 are arranged at positions separated from each other on one side and the other side in the longitudinal direction of the battery lid 21.
- the positive terminal 51 and the negative terminal 61 include external terminals 52 and 62 arranged outside the battery lid 21 and connection terminals 53 and 63 arranged inside the battery lid 21 and electrically connected to the external terminals 52 and 62.
- the positive external terminal 52 and the connection terminal 53 are made of an aluminum alloy
- the negative external terminal 62 and the connection terminal 63 are made of a copper alloy.
- connection terminals 53, 63 and the external terminals 52, 62 are electrically insulated from the battery lid 21 by interposing insulating members (not shown) between the battery lid 21.
- the connection terminals 53 and 63 have current collection terminals 54 and 64 that extend from the inside of the battery lid 21 toward the bottom of the battery can 11 and are conductively connected to the wound electrode body 3.
- the wound electrode body 3 is disposed and supported between the current collecting terminal 54 of the positive electrode terminal 51 and the current collecting terminal 64 of the negative electrode terminal 61, and the power generation element is formed by the lid assembly 4 and the wound electrode body 3.
- An assembly 5 is configured.
- the wound electrode body 3 is replaced with the battery can so that the insulating protective film 41 is disposed between the power generation element assembly 5 and the battery can 11.
- the battery lid 21 and the battery can 11 are welded by laser welding. Thereafter, an electrolyte is injected into the battery container 2 from the liquid inlet 72 of the battery lid 21, and the liquid inlet 72 is closed by the liquid inlet plug 73.
- the liquid injection plug 73 is welded to the battery lid 21 by laser welding.
- the electrolyte is, for example, 1 mol / L of LiPF 6 (lithium hexafluorophosphate) in a mixed solution of ethylene carbonate (EC), dimethyl carbonate (DMC), and diethyl carbonate (DEC) in a volume ratio of 1: 1: 1. What was melt
- LiPF 6 lithium hexafluorophosphate
- the electrolyte an example of using LiPF 6, is not limited thereto, for example, LiClO 4, LiAsF 6, LiBF 4, LiB (C 6 H 5) 4, CH 3 SO 3 Li , CF 3 SOLi, or a mixture thereof can be used.
- LiClO 4 LiAsF 6, LiBF 4, LiB (C 6 H 5) 4, CH 3 SO 3 Li , CF 3 SOLi, or a mixture thereof
- a mixed solvent of EC and DMC is used as the solvent of the nonaqueous electrolytic solution is shown.
- a solvent may be used, and the mixing ratio is not limited.
- FIG. 3 is an exploded perspective view showing details of the power generation element assembly shown in FIG.
- the positive electrode terminal 51 and the negative electrode terminal 61 are attached to the battery lid 21 via an insulating member to produce the lid assembly 4, and then the positive electrode terminal 51 and the negative electrode terminal 61 of the lid assembly 4 are
- the positive electrode uncoated portion 34b and the negative electrode uncoated portion 32b of the rotating electrode body 3 are produced by ultrasonic bonding and conductive connection.
- FIG. 4A shows the details of the wound electrode body shown in FIG. 3 and is an external perspective view in a partially expanded state.
- FIG. 4B is a diagram for explaining the configuration of the shaft core 80.
- FIG. 4C is a diagram showing a state in which the axial center is crushed.
- FIG. 5 is a development view showing the positional relationship between the resin sheet and the separator, the negative electrode plate, and the positive electrode plate at the start of winding.
- the wound electrode body 3 is configured by winding a negative electrode plate (negative electrode) 32 and a positive electrode plate (positive electrode) 34 in a flat shape around an axis 80 via separators 33 and 35 therebetween. .
- the outermost electrode plate is the negative electrode plate 32, and the separator 35 is wound further outside.
- the separators 33 and 35 have a role of insulating between the positive electrode plate 34 and the negative electrode plate 32.
- the negative electrode coating portion 32a of the negative electrode plate 32 is larger in the width direction than the positive electrode coating portion 34a of the positive electrode plate 34, so that the positive electrode coating portion 34a is always connected to the negative electrode coating portion 32a. It is comprised so that it may be pinched.
- the positive electrode uncoated portion 34b and the negative electrode uncoated portion 32b are bundled at a plane portion and connected to current collecting terminals 54 and 64 connected to the external terminals 52 and 62 by welding or the like.
- the separators 33 and 35 are wider than the negative electrode coating part 32a in the width direction, they are wound to a position where the metal foil surface at the end is exposed in the positive electrode uncoated part 34b and the negative electrode uncoated part 32b. Therefore, it does not hinder the welding when bundled.
- the positive electrode plate 34 has a positive electrode coating part 34a in which a positive electrode active material mixture is applied to both surfaces of a positive electrode foil that is a positive electrode current collector, and a positive electrode active part 34 is disposed at one end in the width direction of the positive electrode foil.
- a positive electrode uncoated part (foil exposed part) 34b where no material mixture is applied is provided.
- the negative electrode plate 32 has a negative electrode coating part 32a in which a negative electrode active material mixture is applied to both surfaces of a negative electrode electrode foil that is a negative electrode current collector, and a negative electrode active part is provided at the other end in the width direction of the positive electrode foil.
- a negative electrode uncoated portion (foil exposed portion) 32b to which no material mixture is applied is provided.
- the positive electrode uncoated portion 34b and the negative electrode uncoated portion 32b are regions where the metal surface of the electrode foil is exposed, and are disposed at positions on one side and the other side in the winding axis direction (X direction in FIG. 4). To be wound up.
- negative electrode plate 32 10 parts by weight of polyvinylidene fluoride (hereinafter referred to as PVDF) is added as a binder to 100 parts by weight of amorphous carbon powder as a negative electrode active material, and N as a dispersion solvent.
- amorphous carbon is used as the negative electrode active material
- the present invention is not limited to this, and natural graphite capable of inserting and removing lithium ions and various artificial graphite materials , Carbonaceous materials such as coke, compounds such as Si and Sn (for example, SiO, TiSi 2 etc.), or composite materials thereof may be used. It is not limited.
- the positive electrode plate 34 10 parts by weight of flaky graphite as a conductive material and 10 parts by weight of PVDF as a binder are added to 100 parts by weight of lithium manganate (chemical formula LiMn 2 O 4 ) as a positive electrode active material.
- a positive electrode mixture was prepared by adding and kneading NMP as a dispersion solvent. This positive electrode mixture was applied to both surfaces of an aluminum foil (positive electrode foil) having a thickness of 20 ⁇ m, leaving a solid current collecting part (positive electrode uncoated part). Thereafter, drying, pressing, and cutting were performed to obtain a positive electrode plate having a thickness of 90 ⁇ m, which does not include an aluminum foil.
- lithium manganate is used as the positive electrode active material
- other lithium manganate having a spinel crystal structure or a lithium manganese composite oxide or layered in which a part is substituted or doped with a metal element A lithium cobalt oxide or lithium titanate having a crystal structure, or a lithium-metal composite oxide obtained by substituting or doping a part thereof with a metal element may be used.
- PVDF polytetrafluoroethylene
- polyethylene polyethylene
- polystyrene polybutadiene
- butyl rubber nitrile rubber
- styrene Use polymers such as butadiene rubber, polysulfide rubber, nitrocellulose, cyanoethyl cellulose, various latexes, acrylonitrile, vinyl fluoride, vinylidene fluoride, propylene fluoride, chloroprene fluoride, acrylic resins, and mixtures thereof.
- PTFE polytetrafluoroethylene
- polystyrene polystyrene
- polybutadiene butyl rubber
- nitrile rubber styrene
- styrene Use polymers such as butadiene rubber, polysulfide rubber, nitrocellulose, cyanoethyl cellulose, various latexes, acrylonitrile, vinyl fluoride, vinylidene fluoride, propylene fluoride, chlor
- the shaft core 80 is formed by winding a resin sheet 81 having a higher bending rigidity than any of the positive electrode plate 34, the negative electrode plate 32, and the separators 33 and 35. As shown in FIG. It has an innermost peripheral part 82 that forms a circumference, and an extension part 83 that extends from the innermost peripheral part 82 toward the end of the winding end.
- the resin sheet 81 is thicker than any of the negative electrode plate 32, the positive electrode plate 34, and the separators 33 and 35, and is formed using a rigid insulating resin material.
- the resin sheet 81 has a width in the winding axis direction (X direction) that is the width of the negative electrode coating portion 32a so that the negative electrode coating portion 32a can be wound around the entire outermost peripheral surface of the shaft core 80. It is desirable that the width be equal to or greater than.
- the width of the resin sheet 81 is set to the same width as the separators 33 and 35.
- the shaft core 80 is configured by winding a resin sheet 81 having a bending rigidity higher than that of the negative electrode plate 32, the positive electrode plate 34, and the separators 33 and 35. Therefore, the separators 33 and 35 and the negative electrode plate 32 can be brought into close contact with the outer peripheral surface of the shaft core 80 by the elastic force of the shaft core 80, and further, the positive electrode plate 34 located on the outer periphery thereof can be along. become. Accordingly, it is possible to prevent the separators 33 and 35, the negative electrode plate 32, and the positive electrode plate 34 from starting and unwinding toward the winding center.
- the shaft core 80 As the shaft core 80, a PP sheet having a thickness of 150 ⁇ m is used as the resin sheet 81 in the present embodiment. Even if the resin sheet 81 is used inside the battery, there is no trouble such as deterioration, the bending rigidity is larger than that of the negative electrode plate 32, and the negative electrode plate 32 is closely attached to the outer periphery of the shaft core 80 via the separators 33 and 35.
- the material is not limited to the above-described materials and dimensions.
- FIG. 6 is a diagram illustrating a configuration example of the winding device 100.
- the winding device 100 has a spindle 101 rotatably supported at the center of the device, and is rotated clockwise by a rotation driving device (not shown).
- a supply device for supplying the positive electrode 34, the separator 33 (first separator), the negative electrode 32, the separator 35 (second separator), and the resin sheet 81 to the spindle 101 is provided on the side of the spindle 101. ing.
- the supply device holds the positive electrode 34, the separator 33, the negative electrode 32, the separator 35, and the resin sheet 81 in the form of a roll in order from the upper right of the device, and is fed out from the outer peripheral end portion and supplied to the spindle 101. Also provided are feed rollers 160a to 160e for supplying the electrodes 34 and 32, separators 33 and 35, and the resin sheet 81 to a predetermined length, and cutters 161a to 161e for cutting at a predetermined length.
- the spindle 101 has a flat winding core 102 provided with a grip portion 103 that grips a starting start portion of the resin sheet 81. Then, in the vicinity of the winding core 102, there is provided an attaching means 167 for attaching the adhesive tape 163 so that the winding electrode body 3 is not unwound after the winding core 102 is rotated to form the winding electrode body 3. .
- the adhesive tape 163 is fed out for a predetermined length by the delivery mechanism 164, cut to a predetermined length by the cutter 165, and attached to the wound electrode body 3.
- a heater head 170 for heat-welding the separators 33 and 35 to a resin sheet 81 wound around the winding core 102, and a heater lifting mechanism 171 for raising the heater head 170 to a predetermined position and pressurizing it.
- a temporary pressing mechanism 178 for holding the resin sheet 81 wound around the winding core 102 so as not to be unwound when cutting is provided.
- FIG. 7 is a diagram for explaining a method of winding a resin sheet around a winding core.
- the winding core 102 is for winding the resin sheet 81 to form the shaft core 80, and has a flat plate shape having a larger lateral width than the resin sheet 81.
- the winding core 102 is fixed to the spindle 101 so as to be integrally rotatable so that the winding axis coincides with the rotation center of the spindle 101.
- the winding core 102 has a grip portion 103 that grips the end portion of the resin sheet 81 that has been rolled.
- the grip portion 103 has a configuration capable of expanding or reducing the groove width of the insertion groove 103a formed extending along the winding axis direction, and the end of the resin sheet 81 is inserted into the insertion groove 103a. By reducing the groove width, the end of the resin sheet 81 is gripped.
- the resin sheet 81 is gripped by the grip portion 103 by inserting the end portion of the resin sheet 81 into the insertion groove 103a. And it cut
- FIG. The resin sheet 81 is pressed against the winding core 102 by the temporary pressing roller of the temporary pressing mechanism 178 so as not to be unraveled.
- FIG. 8A is a conceptual cross-sectional view showing the joining structure of the shaft core and the separator in the present embodiment
- FIG. 8B is a diagram for explaining a winding method for the shaft core in the present embodiment.
- the shaft core 80 is formed by causing the gripping portion 103 to grip the end portion of the resin sheet 81 that is rolled and causing the winding core 102 to rotate once.
- the shaft core 80 includes an innermost peripheral portion 82 that forms the innermost periphery of the shaft core 80, and an extension portion 83 that is disposed opposite to the outer periphery of the innermost peripheral portion 82 and serves as an overlap margin.
- the extension part 83 may have a length that winds the outside of the innermost peripheral part 82 one or more times.
- the extension portion 83 and the heater head 170 are sent, and the heater head 170 is raised by the heater lifting mechanism 171. It heat-welds to the outer peripheral surface of the extension part 83 in the state which piled up each end part of the separators 33 and 35 mutually, and is joined to the extension part 83 of the shaft core 80 integrally.
- the resin sheet 81 is wound around the winding core 102 one or more times (a length obtained by adding the innermost peripheral portion 82 and the extension portion 83), and the extension portion 83 of the shaft core 80 is wound.
- Separators 33 and 35 were heat-welded to the outer peripheral surface and joined together.
- the winding core 102 is rotated, and as shown in FIG. 8B, only the separators 33 and 35 are wound around the shaft core 80 one or more times to form a separator winding portion. Further, each rolled starting end of the negative electrode plate 32 and the positive electrode plate 34 is sandwiched and joined between the separators 33 and 35, and further wound to produce a wound electrode body 3 having a predetermined thickness.
- the wound electrode body 3 is removed from the winding core 102 by expanding the insertion groove 103a of the grip portion 103 and extracting it in the rotation axis direction. Then, the wound electrode body 3 is compressed in the wound thickness direction (Z direction), and the axial core 80 of the wound electrode body 3 is wound in the wound thickness direction as shown in FIG. The flat state is crushed.
- the separator winding part absorbs unevenness of the joint part by welding the separators 33 and 35 to the shaft core 80 and then winding only the separators 33 and 35 one or more times continuously to the joint part. And can be relaxed.
- the shaft core 80 is made of a resin sheet 81 and has a certain degree of elasticity. Therefore, by forming the separator winding portion, the shaft core 80 can be deformed so that the entire concavo-convex portion of the joint portion is recessed toward the shaft center side, and a smooth surface can be obtained. Accordingly, the negative electrode plate 32 and the positive electrode plate 34 can be neatly wound on the joint portion to prevent the formation of wrinkles and uneven steps, thereby preventing the generation of gaps between the electrodes and the decrease in battery life. it can.
- FIG. 9 is a cross-sectional conceptual diagram showing an example of a method of joining the shaft core and the separator in the present embodiment.
- a resin sheet 81 having a length of one or more rounds (a length obtained by adding the innermost peripheral portion 82 and the extending portion 83) is wound around the winding core 102 by a half turn, As shown in FIG. 9, the extension portion 83 is held in a state of protruding in a direction away from the innermost peripheral portion 82. Then, between the extension portion 83 and the heater head 170, the separation start end portion of the separator 33 and the separation start end portion of the separator 35 are fed in a superimposed state.
- the heater head 170 is raised by the heater elevating mechanism 171, the heater head 170 heat-welds the starting end portions of the separators 33 and 35 to the outer peripheral surface of the extension portion 83, and the extension portion of the shaft core 80. 83 is integrally joined.
- a pressing mechanism 268 (not shown in the winding device 100 of FIG. 6) is disposed at a position facing the heater head 170 with the resin sheet 81 and the separators 33 and 35 interposed therebetween, and the back pressing of the heater head 170 is performed. Used as
- the resin sheet 81 is wound around the winding core 102, and the separators 33 and 35 are heat-welded and integrally joined to the outer peripheral surface of the extension 83 protruding from the winding core 102. Then, the winding electrode body 3 similar to FIG. 8 can be produced by rotating the winding core 102. Thereby, even if the winding core 102 is thin and the rigidity is low, the wound electrode body 3 can be manufactured. Although not shown, the same effect can be obtained not by heat welding but by joining by tape attachment.
- FIG. 10 is a conceptual cross-sectional view showing the joint structure between the shaft core and the separator in the present embodiment.
- the separator 33 is thermally welded to the inner peripheral surface of the extension portion 83 of the shaft core 80, and the separator 35 is attached to the outer peripheral surface of the extension portion 83 of the shaft core 80.
- This is a configuration in which the end portion at the start of welding is heat-welded and the shaft core 80 and the separators 33 and 35 are joined.
- the separators 33 and 35 are fed between the winding core 102 and the heater head 170 so that the end of the winding end of the resin sheet 81 wound around the winding core 102 is sandwiched therebetween, and the starting end of the separator 33 is extended.
- the separator 83 is disposed so as to face the inner peripheral surface, and the separation start end portion of the separator 35 is disposed so as to face the outer peripheral surface of the extension portion 83.
- the heater head 170 is raised by the heater elevating mechanism 171, and the heater 33 is heated and welded in a state where the extension portion 83 is sandwiched between the starting start portions of the separators 33 and 35. It is integrally joined to the extension 83 of the core 80.
- the winding core 102 is rotated, and only the separators 33 and 35 are wound around the shaft core 80 one or more times to form a separator winding portion, and then each winding start end portion of the negative electrode plate 32 and the positive electrode plate 34 is wound. Is sandwiched between the separators 33 and 35, joined, and further wound to produce a wound electrode body 3 having a predetermined thickness.
- the wound electrode body 3 is removed from the winding core 102 and compressed in the wound thickness direction (Z direction), and the shaft core 80 is crushed in the wound thickness direction. A flat state is assumed.
- the separators 33 and 35 are coated with a material having high heat resistance on the surface facing the positive electrode plate, in the first embodiment, joining with the resin sheet 81 by heat welding may be difficult.
- the surfaces of the separators 33 and 35 that face the resin sheet 81 are heat-weldable surfaces, so that they can be reliably and easily joined and are particularly effective.
- FIG. 11 is a cross-sectional conceptual diagram showing an example of a method for joining the shaft core and the separator in the present embodiment.
- a resin sheet 81 having a length of one or more rounds of the winding core 102 (a length obtained by adding the innermost peripheral portion 82 and the extending portion 83) is applied to the winding core 102 by a half rotation.
- the extension portion 83 is held in a state where the extension portion 83 protrudes in a direction away from the innermost peripheral portion 82.
- the separation start end portion of the separator 33 is disposed opposite to the inner peripheral surface side of the extension portion 83
- the separation start end portion of the separator 35 is disposed opposite to the outer peripheral surface side of the extension portion 83.
- the heater head 170 is raised by the heater elevating mechanism 171, and the heater head 170 heat-welds the rolling start end portions of the separators 33 and 35 to the inner peripheral surface and the outer peripheral surface of the extension portion 83, respectively. It is integrally joined to the extension 83 of the core 80.
- a pressing mechanism 268 (not shown in the winding device 100 of FIG. 6) is disposed at a position facing the heater head 170 with the resin sheet 81 and the separators 33 and 35 interposed therebetween, and the back pressing of the heater head 170 is performed.
- a pair of heater heads 170 may be prepared, sandwiched from both the inner and outer peripheral sides, and heated and welded. According to this, even when, for example, a material having high heat resistance and poor heat conductivity is coated on one side of the separators 33 and 35 on the surface where the separators 33 and 35 are located on the positive electrode, the resin sheet 81 is coated. Since the surfaces of the separators 33 and 35 facing each other are heat-weldable surfaces, they can be reliably and easily joined.
- FIG. 12 is a conceptual cross-sectional view showing a joint structure between the shaft core and the separator in the present embodiment.
- What is characteristic in the present embodiment is a configuration in which the rolling start end portions of the separators 33 and 35 are thermally welded to the inner peripheral surface of the extension portion 83 of the shaft core 80 and the shaft core 80 and the separators 33 and 35 are joined. It is that.
- the shaft core 80 is formed by causing the gripping portion 103 to grip the starting end portion of the resin sheet 81 and rotating the winding core 102 once.
- the shaft core 80 has an innermost peripheral portion 82 and an extension portion 83 that overlaps with the outer periphery of the innermost peripheral portion 82 and serves as an overlap margin.
- the extension portion 83 is disposed opposite to the outer periphery of the innermost peripheral portion 82.
- the heater head 170 is raised by the heater elevating mechanism 171, and the heater head 170 is heated and welded to the inner peripheral surface of the extension portion 83 in a state in which the respective start end portions of the separators 33 and 35 are overlapped with each other. , And integrally joined to the extension 83 of the shaft core 80.
- the resin sheet 81 is wound around the winding core 102 one or more times (a length obtained by adding the innermost peripheral portion and the extension portion) to the inner periphery of the extension portion 83 of the shaft core 80.
- Separators 33 and 35 were heat-welded to the surface and joined together. Then, the winding core 102 is rotated and the separators 33 and 35 are wound around the shaft core 80 one or more times, and then the winding start end portions of the negative electrode plate 32 and the positive electrode plate 34 are interposed between the separators 33 and 35.
- the wound electrode body 3 having a predetermined thickness is produced by sandwiching and joining and further winding.
- the wound electrode body 3 is removed from the winding core 102 by expanding the insertion groove 103a of the grip portion 103 and extracting it in the rotation axis direction. Then, the wound electrode body 3 is compressed in the wound thickness direction (Z direction), and is in a flat state in which the axial core 80 of the wound electrode body 3 is crushed in the wound thickness direction.
- the respective rolling start end portions of the separators 33 and 35 are formed on the inner peripheral surface of the extension portion 83 and the outer peripheral surface of the resin sheet 81 facing the inner peripheral surface (in this embodiment, the innermost surface). In addition to the joining by welding, it is joined by friction caused by being sandwiched between the resin sheets 81. Therefore, the separators 33 and 35 can be more firmly joined to the shaft core 80.
- FIG. 13 is a cross-sectional conceptual diagram showing an example of a method of joining the shaft core and the separator in the present embodiment.
- a resin sheet 81 having a length of one or more rounds (a length obtained by adding the innermost peripheral portion 82 and the extending portion 83) is wound around the winding core 102 by a half turn,
- the extension part 83 is held in a state of protruding in a direction away from the innermost peripheral part 82.
- the respective rolling start end portions of the separators 33 and 35 are fed into positions facing the inner peripheral surface of the extension portion 83.
- the heater head 170 is raised by the heater elevating mechanism 171, and the heater head 170 is heated and welded to the inner peripheral surface of the extension portion 83 in a state where the respective rolling start end portions of the separators 33 and 35 are overlapped with each other.
- a pressing mechanism 268 (not shown in the winding device 100 of FIG. 6) is disposed at a position facing the heater head 170 with the resin sheet 81 and the separators 33 and 35 interposed therebetween, and the back pressing of the heater head 170 is performed.
- the resin sheet 81 is wound around the winding core 102, and the separators 33 and 35 are provided on the portion of the resin sheet 81 protruding from the winding core 102, that is, on the inner peripheral surface of the extension portion 83 of the shaft core 80. Heat-welded and joined together. Then, the winding electrode body 3 similar to FIG. 8 can be produced by rotating the winding core 102. Thereby, even if the winding core 102 is thin and the rigidity is low, the wound electrode body 3 can be manufactured. Although not shown, the same effect can be obtained not by heat welding but by joining by tape attachment.
- the positional relationship between the pressing mechanism 268 and the heater head 170 disposed in the winding device 100 of FIG. 6 may be reversed up and down.
- FIG. 14 is a conceptual cross-sectional view showing the joint structure of the shaft core and the separator in the present embodiment.
- the shaft core 80 is formed by causing the gripping portion 103 to grip the starting end portion of the resin sheet 81 and rotating the winding core 102 once.
- the shaft core 80 has an innermost peripheral portion 82 and an extension portion 83 that overlaps with the outer periphery of the innermost peripheral portion 82 and serves as an overlap margin.
- the extension portion 83 is disposed opposite to the outer periphery of the innermost peripheral portion 82.
- the separation start end portion of the separator 33 and the separation start end portion of the separator 35 are fed into a position facing the inner peripheral surface of the separation end portion of the resin sheet 81. Then, the unwinding-preventing touch roller 179 is raised, and the separators 33 and 35 are sandwiched between the extension portion 83 and the outer peripheral surface of the resin sheet 81 facing the inner peripheral surface of the extension portion 83, and friction is caused. The separators 33 and 35 are prevented from being pulled out by using force, and are integrally joined to the shaft core 80.
- the resin sheet 81 is wound around the winding core 102 one or more times, and the first separator 33 and the second separator 35 are placed on the inner peripheral surface side of the extension 83 so as to prevent unwinding. Fix with the touch roller. Thereafter, the winding core 102 is rotated once, and the separators 33 and 35 for at least one turn are wound around the outside of the shaft core 80. Then, the touch roller 171 is retracted, and the winding core 102 is further rotated to perform winding.
- the resin sheet 81 preferably has a large friction coefficient.
- the extension portion 83 can obtain a larger friction force as the length of sandwiching the separators 33 and 35 between the inner peripheral surface thereof and the outer peripheral surface of the resin sheet 81 facing the inner peripheral surface is increased. It is preferable that the length around the innermost peripheral portion 82 be at least half a circle, preferably one or more rounds.
- FIG. 15A is a diagram for explaining a winding method for the shaft core in the present embodiment
- FIG. 15B is a conceptual cross-sectional view showing a joint structure between the shaft core and the separator in the present embodiment.
- the separators 33 and 35 are overlapped and inserted into the insertion groove 103a of the gripping part 103, and the groove width of the insertion groove 103 is increased in a state in which the separation start ends of the separators 33 and 35 protrude from the winding core 102 by a predetermined length.
- the separators 33 and 35 are gripped by the grip portion 103 of the winding core 102 by reducing the size.
- the resin sheet 80 is arrange
- FIG. 15B by raising the touch roller 179 for preventing unwinding and rotating the winding core 102 once, as shown in FIG. 15B, an innermost peripheral portion 82 and an innermost peripheral portion are formed around the winding core 102.
- An axial core 80 is formed having an extension portion 83 that overlaps the outer periphery of the portion 82 and serves as an overlap margin.
- the extension portion 83 is disposed opposite to the outer periphery of the innermost peripheral portion 82, and at the position facing the inner peripheral surface of the end portion of the resin sheet 81, a part of the separator 33 on the start side and the start of the separator 35. A part of the side is arranged.
- the separators 33 and 35 are clamped by the shaft core 80 while following the shaft core 80, and are integrally joined to the shaft core 80.
- the winding start end portions of the separators 33, 35 protrude from the innermost peripheral portion 82 and the extension portion 83 toward the center side of the shaft core 80 and are disposed on the inner surface side of the shaft core 80.
- the gripping portion 103 of the winding core 102 grips a part of the winding start side of the separators 33 and 34.
- the present invention is not limited to this.
- 34 may be gripped at the winding start end.
- the touch roller 179 for preventing unwinding is used for the purpose of copying the shaft core 80 and the separators 33 and 35 to the winding core 102.
- the present invention is not limited to this. Even if it does not exist, it is possible to produce the wound electrode body 3.
- the grip portions 103 and 103a of the winding core 102 are caused to grip only a part of the winding start side of the separators 33 and 34.
- the present invention is not limited to this. Or a part may be held simultaneously or individually with the separators 33 and 35.
- the unwinding-preventing touch roller 179 has the shaft core 80 and the separators 33 and 35 as the winding core 102. Since it is used for copying and does not aim to fix the separators 33 and 35, it can be produced stably, and the rotation speed of the winding core 102 at the beginning of winding can be increased, so that the production tact can be improved. I can expect.
- the present invention is not limited to the above-described embodiments, and various designs can be made without departing from the spirit of the present invention described in the claims. It can be changed.
- the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described.
- a part of the configuration of an embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of an embodiment.
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Abstract
Description
本実施形態では、扁平捲回形二次電池がリチウムイオン二次電池である場合を例に説明する。
図10は、本実施形態における軸芯とセパレータの接合構造を示す断面概念図である。
図12は、本実施形態における軸芯とセパレータの接合構造を示す断面概念図である。
図14は、本実施形態における軸芯とセパレータの接合構造を示す断面概念図である。
図15Aは、本実施形態における軸芯に対する捲回方法を説明する図、図15Bは、本実施形態における軸芯とセパレータの接合構造を示す断面概念図である。
2 電池容器
3 捲回電極体
4 蓋組立体
5 発電要素組立体
11 電池缶
21 電池蓋
32 負極板(負極電極)
33 セパレータ(第1のセパレータ)
34 正極板(正極電極)
35 セパレータ(第2のセパレータ)
41 絶縁保護フィルム
51 正極端子(電極端子)
52、62 外部端子
53、63 接続端子
54、64 集電端子
61 負極端子(電極端子)
71 ガス排出弁
72 注液口
73 注液栓
80 軸芯
81 樹脂シート
82 最内周部
83 延長部
100 捲回装置
101 巻き芯
170 ヒータヘッド
Claims (15)
- 正極電極及び負極電極を間にセパレータを介して軸芯の周りに扁平に捲回した捲回電極体を有する扁平捲回形二次電池であって、
前記軸芯は、前記正極電極と前記負極電極と前記セパレータのいずれよりも曲げ剛性の高い樹脂シートを捲回して構成され、前記軸芯の最内周を形成する最内周部と、該最内周部よりも捲き終わり端部側に延長された延長部とを有し、
前記セパレータは、前記延長部に接合された接合部と、該接合部に連続して前記軸芯の周りに前記セパレータのみを1周以上捲回したセパレータ捲回部と、を有することを特徴とする扁平捲回形二次電池。 - 前記セパレータは、前記延長部の外周面に熱溶着により接合される第1のセパレータと第2のセパレータを有することを特徴とする請求項1に記載の扁平捲回形二次電池。
- 前記セパレータは、前記延長部の内周面に熱溶着により接合される第1のセパレータと、前記延長部の外周面に熱溶着により接合される第2のセパレータを有することを特徴とする請求項1に記載の扁平捲回形二次電池。
- 前記セパレータは、前記延長部の内周面に熱溶着により接合される第1のセパレータと第2のセパレータを有することを特徴とする請求項1に記載の扁平捲回形二次電池。
- 前記セパレータは、前記延長部の内周面と該延長部の内周面に対向する前記樹脂シートの外周面との間に前記セパレータの捲き始め端部側を挟み込むことによって接合されていることを特徴とする請求項1に記載の扁平捲回形二次電池。
- 前記セパレータは、該セパレータの捲き始め端部が前記最内周部と前記延長部との間から前記軸芯の中心側に突出していることを特徴とする請求項5に記載の扁平捲回形二次電池。
- 正極電極及び負極電極を間にセパレータを介して軸芯の周りに扁平に捲回した捲回電極体を有する扁平捲回形二次電池の製造方法であって、
前記正極電極と前記負極電極と前記セパレータのいずれよりも曲げ剛性の高い樹脂シートを捲回して前記軸芯を形成する工程と、
前記軸芯の最内周を形成する最内周部よりも捲き終わり端部側に延長された延長部に前記セパレータを接合する工程と、
前記延長部との接合部分に連続して前記セパレータのみを前記軸芯の周りに1周以上捲回してセパレータ捲回部を形成する工程と、
を含むことを特徴とする扁平捲回形二次電池の製造方法。 - 前記セパレータを接合する工程では、
前記延長部が前記最内周部の外周に対向配置された状態で、前記延長部の外周面に前記セパレータの捲き始め端部を熱溶着することを特徴とする請求項7に記載の扁平捲回形二次電池の製造方法。 - 前記セパレータを接合する工程では、
前記延長部が前記最内周部から離れる方向に向かって突出した状態で、前記延長部の外周面に前記セパレータの捲き始め端部を熱溶着することを特徴とする請求項7に記載の扁平捲回形二次電池の製造方法。 - 前記セパレータを接合する工程では、
前記延長部が前記最内周部の外周に対向配置された状態で、前記延長部の内周面に第1のセパレータの捲き始め端部を対向配置し、かつ、前記延長部の外周面に第2のセパレータの捲き始め端部を対向配置して熱溶着することを特徴とする請求項7に記載の扁平捲回形二次電池の製造方法。 - 前記セパレータを接合する工程では、
前記延長部が前記最内周部から離れる方向に向かって突出した状態で、前記延長部の内周面に第1のセパレータの捲き始め端部を対向配置し、かつ、前記延長部の外周面に第2のセパレータの捲き始め端部を対向配置して熱溶着することを特徴とする請求項7に記載の扁平捲回形二次電池の製造方法。 - 前記セパレータを接合する工程では、
前記延長部が前記最内周部の外周に対向配置された状態で、前記延長部の内周面に前記セパレータの捲き始め端部を熱溶着することを特徴とする請求項7に記載の扁平捲回形二次電池の製造方法。 - 前記セパレータを接合する工程では、
前記延長部が前記最内周部から離れる方向に向かって突出した状態で、前記延長部の内周面に前記セパレータの捲き始め端部を熱溶着することを特徴とする請求項7に記載の扁平捲回形二次電池の製造方法。 - 前記セパレータを接合する工程では、
前記延長部が前記最内周部の外周に対向配置された状態で、前記延長部の内周面と該延長部の内周面に対向する前記樹脂シートの外周面との間に前記セパレータの捲き始め端部側を挟み込むことにより接合することを特徴とする請求項7に記載の扁平捲回形二次電池の製造方法。 - 前記セパレータは、該セパレータの捲き始め端部が前記最内周部と前記延長部との間から前記軸芯の中心側に突出していることを特徴とする請求項14に記載の扁平捲回形二次電池の製造方法。
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CN201380023028.0A CN104285329B (zh) | 2012-05-01 | 2013-01-18 | 扁平卷绕形二次电池及其制造方法 |
US14/398,240 US20150086821A1 (en) | 2012-05-01 | 2013-01-18 | Flat wound secondary battery and method for producing same |
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WO2018001164A1 (zh) * | 2016-06-27 | 2018-01-04 | 宁德时代新能源科技股份有限公司 | 电芯以及使用此电芯的电池 |
KR101888793B1 (ko) * | 2016-08-29 | 2018-08-14 | 스미또모 가가꾸 가부시키가이샤 | 권취 코어, 세퍼레이터 권회체 |
CN108288686A (zh) * | 2018-01-22 | 2018-07-17 | 惠州亿纬锂能股份有限公司 | 一种提高电池隔膜强度的方法及电池 |
JP7240612B2 (ja) * | 2019-12-11 | 2023-03-16 | トヨタ自動車株式会社 | 二次電池の製造方法 |
JP2023025920A (ja) * | 2021-08-11 | 2023-02-24 | 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 | 電池の製造方法 |
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