WO2002013305A1 - Coin-shaped battery - Google Patents
Coin-shaped battery Download PDFInfo
- Publication number
- WO2002013305A1 WO2002013305A1 PCT/JP2001/006884 JP0106884W WO0213305A1 WO 2002013305 A1 WO2002013305 A1 WO 2002013305A1 JP 0106884 W JP0106884 W JP 0106884W WO 0213305 A1 WO0213305 A1 WO 0213305A1
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- WIPO (PCT)
- Prior art keywords
- electrode plate
- negative electrode
- positive electrode
- coin
- battery
- Prior art date
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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
- H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like 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
- H01M10/058—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
- 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
- H01M10/045—Cells or batteries with folded plate-like 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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/661—Metal or alloys, e.g. alloy coatings
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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 of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
- H01M50/117—Inorganic material
- H01M50/119—Metals
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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 of a single cell or a single battery
- H01M50/147—Lids or covers
- H01M50/155—Lids or covers characterised by the material
- H01M50/157—Inorganic material
- H01M50/159—Metals
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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 of a single cell or a single battery
- H01M50/147—Lids or covers
- H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
- H01M50/167—Lids or covers characterised by the methods of assembling casings with lids by crimping
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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
- 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
- H01M50/572—Means for preventing undesired use or discharge
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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
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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
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/04—Cells with aqueous electrolyte
- H01M6/06—Dry cells, i.e. cells wherein the electrolyte is rendered non-fluid
- H01M6/10—Dry cells, i.e. cells wherein the electrolyte is rendered non-fluid with wound or folded electrodes
- H01M2006/106—Elliptic wound 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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
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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 of a single cell or a single battery
- H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
- H01M50/109—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure of button or coin shape
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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 of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
- H01M50/124—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material having a layered structure
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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 invention relates to a flat cylindrical coin-shaped battery, and more particularly to a coin-shaped battery in which a wound electrode group is housed in a coin-shaped battery case in order to obtain high load discharge characteristics.
- coin batteries also called button batteries or flat batteries
- they are widely used as power sources for small devices such as watches and hearing aids, and thin devices such as IC cards.
- a conventional coin-shaped battery C is composed of a positive electrode pellet 32 and a negative electrode pellet 33 formed in a disk shape in a sealed location 35 formed in a shallow bottomed cylindrical shape.
- the cap case 31 is disposed at the opening of the sealing case 35 via the gasket 36, and the opening end of the cap case 31 is placed. Is bent inward to seal the internal space formed by the cap case 31 and the sealing case 35 by crimping.
- a battery employing such an electrode plate structure in which the positive electrode plate 32 and the negative electrode plate 33 face each other in a one-to-one manner may be affected by factors such as a small reaction area where the positive electrode plate and the negative electrode plate face each other.
- the continuous discharge current was at most about 10 mA, and was applicable only to equipment with a small load current.
- the battery disclosed here has a rectangular planar shape, and a thin rectangular parallelepiped electrode group formed by a wound structure or a laminated structure is accommodated in a rectangular parallelepiped battery case.
- a rectangular electrode plate group is accommodated in a circular battery case, so that the volume efficiency of the battery is low and sufficient battery capacity cannot be obtained.
- the electrode group housed in the coin-shaped battery case is composed of a positive electrode plate having a positive electrode current collector coated with a positive electrode material and a negative electrode plate having a negative electrode current collector coated with a negative electrode material.
- the positive electrode plate and the negative electrode plate are bent by the connecting pieces so that the laminated surface of the positive electrode plate and the laminated surface of the negative electrode plate are alternately laminated via a separator. It is formed by winding into a shape.
- a transition metal oxide such as lithium cobalt oxide
- the negative electrode material a carbon material such as graphite capable of inserting and extracting lithium ions is used.
- the potential of the graphite-based material at the time of charging is a low potential that is almost the same as the potential at which lithium deposition occurs. Therefore, in a battery in which the anode material has deteriorated due to repeated charge / discharge cycles, etc., lithium ions inserted into the anode material during charging cause an inactivation reaction with the electrolytic solution, resulting in dendritic formation on the anode surface. There is a problem that a phenomenon occurs in which (dendritic) lithium metal is deposited, and the internal short circuit resulting from this causes a reduction in the safety and life of the battery.
- a coin-type battery according to the first invention of the present application comprises a positive electrode plate having a positive electrode current collector coated with a positive electrode material, and a negative electrode plate having a negative electrode current collector coated with a negative electrode material.
- a positive electrode plate and a negative electrode are formed so that both are formed in a band shape in which a plurality of laminated surfaces are connected by a connecting piece, and the laminated surface of the positive electrode plate and the laminated surface of the negative electrode plate are alternately laminated via a separator.
- the plate is bent by a connecting piece and wound into a flat shape to form an electrode group.
- the electrode group is housed in a battery case that seals the opening of a shallow bottomed cylindrical cap case with a sealing case. It is characterized by becoming.
- the laminated surface of the positive electrode plate and the laminated surface of the negative electrode plate face a plurality of layers via the separator, so that the reaction area increases and the large current discharge characteristics of the battery improve. . Since the electrode plate group of the present invention is formed by bending and winding the positive electrode plate and the negative electrode plate with connecting pieces for connecting a plurality of laminated surfaces, the electrode plate group can be accommodated in a thin battery case.
- the coin-type battery according to the second invention of the present application is characterized in that both the positive electrode plate in which the positive electrode current collector is coated with the positive electrode material and the negative electrode plate in which the negative electrode current collector is coated with the negative electrode material have a plurality of stacked surfaces.
- the positive electrode plate and the negative electrode plate are overlapped so that the positive electrode material-coated surface of the positive electrode plate and the negative electrode material-coated surface of the negative electrode plate face each other via a separator.
- a flat electrode group is formed by alternately bending and compressing the connecting portion in the opposite direction so that the stacked surface of the positive electrode plate and the stacked surface of the negative electrode plate are stacked. It is characterized by being housed in a battery case that seals the opening of a cylindrical cap case with a bottom with a sealing case.
- the reaction area is increased, and the large current discharge characteristics of the battery are improved.
- the electrode group of the coin-type battery according to the third invention of the present application includes a positive electrode plate in which a positive electrode material is coated on both surfaces of a positive electrode current collector, and a negative electrode plate in which a negative electrode material is coated on both surfaces of a negative electrode current collector Are formed in a strip shape in which a plurality of laminated surfaces are connected by connecting pieces, a positive electrode lead is formed by extending a positive electrode current collector from one end of the positive electrode plate, and a negative electrode is formed from one end of the negative electrode plate. A negative electrode lead having an extended current collector is formed, and the side on which the positive electrode lead and the negative electrode lead are formed is formed.
- the positive electrode plate and the negative electrode plate are folded by a connecting piece and wound into a flat shape such that the laminated surface of the positive electrode plate and the laminated surface of the negative electrode plate are alternately laminated via a separator. Formed.
- the electrode group is housed in a battery case in which the opening of the cylindrical cap case having a shallow bottom is sealed by a sealing case, and the tip of the positive electrode lead of the electrode group is a cap case. And the tip of the negative electrode lead is welded to the sealing case.
- the laminated surface of the positive electrode plate and the laminated surface of the negative electrode plate face a plurality of layers via the separator, so that the reaction area increases, and the coin-type electrode capable of discharging a large current is formed. Pond is obtained.
- the positive electrode plate is connected to the cap case by the positive electrode lead, and the negative electrode plate is connected to the sealing case by the negative electrode lead. The battery's internal resistance does not increase even when the condition occurs.
- the electrode group of the coin-shaped battery according to the fourth invention of the present application includes a positive electrode plate in which a positive electrode material is coated on one surface of a positive electrode current collector, and a negative electrode in which a negative electrode material is coated on one surface of a negative electrode current collector.
- Each of the plates is formed in a band shape connecting a plurality of laminated surfaces, a positive electrode lead is formed by extending a positive electrode current collector from one end of the positive electrode plate, and a negative electrode current collector is formed from the other end of the negative electrode plate.
- An extended negative electrode lead is formed, and the positive electrode material-coated surface of the positive electrode plate and the negative electrode material-coated surface of the negative electrode plate face each other through separation, and the laminated surface of the positive electrode plate and the negative electrode plate are separated.
- the positive electrode plate and the negative electrode plate are alternately folded in the opposite direction at the connecting portion so as to be laminated with the lamination surface, and are compressed to form a flat shape.
- the electrode group is housed in a battery case in which the opening of the cylindrical cap case having a shallow bottom is sealed with a sealing case, and the tip end of the positive electrode lead of the electrode group is in the cap case.
- the tip of the negative electrode lead is welded to the sealing case.
- the strip-shaped positive electrode plate and the negative electrode plate are folded to form a flat electrode plate group, so that they can be accommodated in a thin battery case, and the electrode area increases.
- a coin-shaped battery capable of discharging a large current is obtained.
- the positive electrode plate is connected to the cap case by the positive electrode lead, and the negative electrode plate is connected to the sealing case by the negative electrode lead. Therefore, a reliable current collecting structure can be obtained, and the internal resistance of the battery does not increase even when the cap case and the sealing case are deformed due to an increase in battery internal pressure.
- the electrode group of the coin type battery according to the fifth invention of the present application includes a positive electrode plate in which a positive electrode current collector is coated with a positive electrode material mainly composed of a lithium-containing transition metal oxide; a negative electrode current collector; A negative electrode plate coated with a releasable negative electrode material is formed in a strip shape in which a plurality of stacked surfaces are connected by connecting pieces, and the stacked surface of the positive electrode plate and the stacked surface of the negative electrode plate are separated.
- the positive electrode plate and the negative electrode plate are formed by bending the respective positive and negative electrode plates and winding them into a flat shape so that they are alternately stacked.
- the electrode plate group is accommodated and formed in a flat battery case, and the positive electrode plate of the electrode plate group is formed by winding the negative electrode plate of the connection piece positioned closest to the winding center.
- the surface facing the winding end in the center direction is covered with an insulating member.
- the positive electrode plate facing the winding end of the negative electrode plate in the direction of the winding center is covered with the insulating member, so that charging is performed in the vicinity of the winding end of the negative electrode plate in the direction of the winding center.
- it reduces the amount of lithium ions desorbed from the positive electrode plate into the non-aqueous electrolyte, suppresses the deposition of lithium metal on the negative electrode plate, and deteriorates the charge / discharge cycle life caused by the deposition of lithium metal (or dendrite). Prevent safety degradation.
- the electrode group of the coin-type battery according to the sixth invention of the present application includes: a positive electrode plate in which a positive electrode current collector is coated with a positive electrode material mainly composed of a transition metal oxide; a negative electrode current collector; Both of the negative electrode plates coated with the dischargeable negative electrode material are formed in a strip shape in which a plurality of lamination surfaces are connected by connecting pieces, and the lamination surface of the positive electrode plate and the lamination surface of the negative electrode plate are separated.
- the positive electrode plate and the negative electrode plate are bent by their respective connecting pieces and wound into a flat shape so that they are alternately stacked.
- the coin-type battery of the present invention is formed by housing this electrode plate group in a flat battery case, and the positive electrode plate of the electrode plate group is formed by winding the above-mentioned negative electrode plate on the connecting piece located closest to the center of the winding. An uncoated portion where the positive electrode material is not applied is formed on a surface facing the end.
- the inner peripheral surface of the connecting piece of the positive electrode plate facing the winding end of the negative electrode plate in the direction of the winding center where lithium metal is likely to be deposited is not coated with the positive electrode material. part In the vicinity of the winding end of the negative electrode plate, lithium ions released from the positive electrode plate into the non-aqueous electrolyte during charging are reduced, and the charge-discharge cycle caused by the deposition of lithium metal on the surface of the negative electrode plate is reduced. Prevents deterioration of service life and safety.
- the electrode group of the coin-type battery according to the seventh invention of the present application includes a positive electrode plate in which a positive electrode material mainly composed of a transition metal oxide is coated on a positive electrode current collector, and lithium insertion and extraction in the negative electrode current collector.
- Both of the negative electrode plates coated with a possible negative electrode material are formed in a band shape in which a plurality of laminated surfaces are connected by connecting pieces, and the laminated surface of the positive electrode plate and the laminated surface of the negative electrode plate are separated through a separator.
- the positive electrode plate and the negative electrode plate are bent by connecting pieces thereof and wound into a flat shape so that they are alternately stacked.
- the coin-type battery of the present invention is formed by accommodating this electrode group in a flat battery case, and the negative electrode plate of the electrode group is covered with an insulating member on the end surface on the winding center side. It is characterized by becoming.
- the winding end portion of the negative electrode plate toward the center of the winding where lithium metal is liable to be deposited is covered with an insulating member so that lithium metal does not precipitate on the surface of the negative electrode plate.
- FIG. 1 is a cross-sectional view illustrating a configuration of a coin-type battery A according to a first embodiment of the present invention.
- FIG. 2 is a plan view illustrating a configuration of the coin-type battery A.
- FIG. 3A is a development view showing the configuration of the positive electrode plate
- FIG. 3B is a development view showing the configuration of the negative electrode plate
- FIG. 4 is a schematic diagram illustrating a winding state of the electrode plate group.
- FIG. 5A is a developed view showing the configuration of the positive plate of the coin-type battery B
- FIG. 5B is a developed view showing the configuration of the negative plate.
- FIG. 6A is a plan view showing the configuration of a coin-type battery B
- FIG. 6B is a cross-sectional view.
- 7A and 7B are developed views showing a modification of the electrode plate
- FIG. 8A is an explanatory diagram showing a configuration of a folded electrode group
- FIG. 8B is a configuration diagram of the electrode group.
- FIG. 9A is a plan view of a folded positive electrode plate
- FIG. 9B is a plan view of a negative electrode plate
- FIG. 10 is a graph showing the measurement results of the discharge capacity ratio
- FIG. 11 is a cross-sectional view showing a configuration of a coin-type battery D according to the second embodiment of the present invention.
- FIG. 12A is a development view showing the configuration of the positive electrode plate
- FIG. 12B is a development view showing the configuration of the negative electrode plate.
- FIG. 13 is a schematic diagram showing a winding state of the electrode group.
- FIG. 14A is an explanatory view showing the configuration of a folded electrode group
- FIGS. 14B and 14C are configuration diagrams of the electrode plates.
- FIG. 15A is a plan view of the folded positive electrode plate
- FIG. 15B is a plan view of the negative electrode plate
- FIG. 16 is a graph showing a change in internal resistance of the battery due to storage in a high-temperature environment.
- Figure 17 is a graph showing the change in total battery height in a high temperature environment.
- FIG. 18A is a development view of the positive electrode plate according to the third embodiment of the present invention
- FIG. 18B is a development view of the negative electrode plate.
- FIG. 19 is a schematic diagram showing the configuration of the electrode group.
- FIG. 2OA is a development view of the positive electrode plate according to the fourth embodiment of the present invention
- FIG. 20B is a development view of the negative electrode plate.
- FIG. 21 is a schematic diagram showing the configuration of the electrode group
- FIG. 22A is a development view of the positive electrode plate according to the fifth embodiment of the present invention
- FIG. 22B is a development view of the negative electrode plate
- FIG. 23 is a schematic diagram showing the configuration of the electrode group.
- FIG. 24 is a cross-sectional view showing the configuration of a conventional coin-type battery. BEST MODE FOR CARRYING OUT THE INVENTION
- the coin-type battery A includes a shallow bottomed cylindrical cap case 4 and a sealing case 5 that seals an opening of the cap case 4 through a gasket 6.
- the electrode case 1 with a wound structure is Is done.
- the electrode plate group 1 is arranged in a circular space in the sealing case 5, and thus has a substantially circular planar shape so that no useless space is formed. Therefore, a battery having a large capacity per volume is constructed.
- the electrode group 1 is formed by flatly winding a positive electrode plate 7 shown in FIG. 3A and a negative electrode plate 8 shown in FIG. 3B via a separator 9 as shown in FIG. You.
- the positive electrode plate 7 is formed by punching out an electrode plate material in which a positive electrode material is applied to both sides of an aluminum foil positive electrode current collector, and forming a circular arc in the width direction as shown in FIG. 3A.
- 7a ⁇ : L7e is formed in a belt-like shape in which positive electrode connecting pieces 19a to 19d are connected.
- the negative electrode plate 8 is formed by punching an electrode plate material coated with a negative electrode material on both surfaces of a copper foil negative electrode current collector, and forming a circular arc in the width direction as shown in FIG. 3B. It is formed in a strip shape in which 18 a to 18 e are connected by negative electrode connecting pieces 20 a to 20 d.
- the width of the negative electrode plate 8 is formed slightly larger than the width of the positive electrode plate 7, the positive electrode laminated surface 17a to 17e and the negative electrode laminated surface 18a to 18e face each other. Even if misalignment occurs, the reaction area does not decrease.
- the positive electrode plate 7 and the negative electrode plate 8 are connected to each other through a separator 9 between the positive electrode laminated surface 17 a to e and the negative electrode laminated surface 18 a to 18 e.
- the separator 9 is a tape formed from a microporous polyethylene film, and is formed in a tape shape having a width larger than the width of the negative electrode plate 8. After the separator 9 is wound together with the positive electrode plate 7 and the negative electrode plate 8, the four corners are cut off in an arc shape to form a disk-shaped electrode plate group 1.
- the positive electrode connecting piece 19 of the positive electrode plate 7 and the negative electrode plate 8 is wound.
- the connection direction lengths of a to 19 d and the negative electrode connection pieces 20 a to 20 d need to be longer as the connection pieces are located outside when being wound.
- FIGS.3A and 3B from the length a of the connecting piece located at the beginning of winding to the length d of the connecting piece located at the end of winding, the positive electrode plate 7, the negative electrode plate 8, Separate the thickness of the evening 9 to increase sequentially.
- the width W1 of the positive electrode connecting pieces 19a to 19d and the width W2 of the negative electrode connecting pieces 20a to 20d are set as small as possible in order to reduce a decrease in battery voltage during charging and discharging with a large current. It is formed with a large width. That is, as shown in FIG. 2, in order to house the electrode plate group 1 with good volume efficiency in the circular housing space of the sealing case 5, the positive electrode connecting piece 19a ⁇ ; L9d and the negative electrode connecting piece 20 & ⁇ 20 (It is desirable that the width 1 and W 2 of 1 be smaller. However, if the width is reduced, the voltage drops greatly. Therefore, the positive electrode connecting pieces 19 a to 19 d and the negative electrode connecting pieces 20 a to 2 The widths W l and W 2 of 0 d are determined.
- the electrode plate group 1 configured as described above is housed in a sealed location 5 having a gasket 6 mounted on the peripheral side as shown in FIG.
- the electrolytic solution is injected into the sealing case 5, the cap case 4 is put on the opening of the sealing case 5 via the gasket 6, and the open end of the cap case 4 is bent inward to compress the gasket 6 by crimping. Then, the internal space is sealed to form a coin battery A.
- the gasket 6 serves not only as a sealing material for sealing the internal space, but also as an insulating material for insulating between the cap case 4 serving as a positive terminal of the coin-type battery A and the sealing case 5 serving as a negative terminal. Fulfill.
- the electrical connection of the positive electrode plate 7 to the cap case 4 and the electrical connection of the negative electrode plate 8 to the sealing case 5 are performed by pressure welding.
- the positive electrode plate 7 and the cap case 4 and the negative electrode plate 8 and the sealing case 5 are electrically contacted by pressure contact.
- the positive electrode laminated surface 17 e which was the outermost periphery, was exposed to the outer surface or both surfaces of the positive electrode laminated surface 17 e so that the positive electrode current collector as the core material was exposed.
- the negative electrode plate 8 is also set such that the negative electrode current collector is exposed on the negative electrode laminated surface 18 e which is the outermost periphery when the negative electrode plate 8 is wound.
- the positive electrode current collector is exposed on one surface and the negative electrode current collector is exposed on the other surface.
- the electrode group 1 is housed in the sealing case 5 such that the side of the electrode plate 1 contacts the bottom surface of the sealing location 5. Cover the sealed location 5 with the cap case 4 via the gasket 6, and The opening end is bent inward and the sealing case 5 is pressed against the cap case 4 side by the sealing, so that the electrode plate group 1 is compressed between the sealing case 5 and the cap case 4 and the negative electrode current collector is sealed. 5, the positive electrode current collector is pressed against the cap case 4.
- the pressure contact between the negative electrode plate and the sealing case 5 and the pressure contact between the positive electrode plate and the cap case 4 do not necessarily require the negative electrode current collector and the positive electrode current collector to be exposed.
- the positive electrode material surface of the positive electrode plate may be pressed against the cap case 4.
- the positive electrode plate 7 and the negative electrode plate 8 shown in FIGS. 3A and 3B are formed by punching from the electrode plate material as described above. A large amount of residue remains after being removed, which is wasteful from the viewpoint of material removal.
- the material removal efficiency is highest when the positive electrode plate 11 and the negative electrode plate 12 are laminated on the laminated surfaces 13a to 13e and the connecting pieces 14a to: L 4d is a case where the tape is formed in the same width.
- the electrode plate group 2 in which such a tape-shaped positive electrode plate 11 and negative electrode plate 12 are wound has a square planar shape, and as shown in FIGS. 6A and 6B, a circular sealing case.
- the volume efficiency when the coin-shaped battery B is accommodated in 5 is inferior to the coin-shaped battery A described above. However, when compared to batteries of the conventional structure, they show much better discharge characteristics. This discharge characteristic will be described later.
- the shape of the electrode plate is desirably one with good volumetric efficiency, but the one that does not waste material is effective in terms of cost.Therefore, in consideration of both, for example, the shape as shown in Figs. 7A and 7B May be made.
- the electrode plate 24 shown in Fig. 7A (common to the positive electrode plate and the negative electrode plate) 24 has one side in the width direction formed as a straight line, so the electrode plate 24 is punched into a pair of straight sides. And residue generated on the electrode plate material is reduced.
- FIG. 8A shows an electrode group 40 having a folded structure, in which a positive electrode plate 41 and a negative electrode plate 42 face each other via a separator 9 and are folded. As shown in FIG.
- the positive electrode plate 41 is formed by applying a positive electrode material 47 to one surface of a positive electrode current collector 45, and the negative electrode plate 42 is formed by applying a negative electrode material to one surface of a negative electrode current collector 44.
- the positive electrode plate 41 is formed by coating the positive electrode material 47 with the coated surface of the negative electrode material 46 through the separator 9.
- a positive electrode lamination surface 51 having arcs formed on both sides is formed in a band shape connected by a connection portion 52.
- the negative electrode plate 42 is formed in a band shape in which negative electrode laminated surfaces 72 having arcs formed on both sides are connected by connecting portions 53.
- the positive electrode plate 41 and the negative electrode plate 42 are alternately folded in the opposite directions from the connecting portions 52 and 53, and the folded and compressed electrode plate group 40 has a planar shape.
- the situation is similar to that shown in FIG.
- the electrode group 40 has a negative electrode plate 42 on one end surface and a positive electrode plate 41 on the other end surface, each of which has no negative electrode material 46 and positive electrode material 4 7 ′ coated thereon. Since the body 44 and the positive electrode current collector 45 are exposed, the exposed surface of the positive electrode current collector 45 is placed in the cap case 4 and housed in the cap case 4, and the opening of the cap case 4 is gasket. When sealing is performed by the sealing case 5 via 6, the positive electrode current collector 45 is pressed against the cap case 4 and the negative electrode current collector 44 is pressed against the sealing case 5 to make electrical connection.
- Aruminiumu foil having a thickness of 2 0 ⁇ M dissolving Porifudzu mold two isopropylidene 3 parts by weight of 3 8 parts by weight N- methylpyrrolidone, L i C o 0 2 5 0 parts by weight as the active material,
- a cathode material mixed with 9 parts by weight of graphite as a conductive agent and mixed and dispersed under an inert atmosphere is applied in the air to a uniform thickness, and then rolled to a thickness of 180 m to form a cathode plate material. create.
- This positive electrode plate is dried at 120 ° C. for 1 hour, and then punched to form a positive electrode plate 7.
- the positive electrode plate 7 has the shape shown in FIG. 3A, and the positive electrode laminated surface 17 a to 17 The width of e is 22 mm.
- the positive electrode plate 7 and the negative electrode plate 8 having the above configuration are laminated with the positive electrode laminated surfaces 17a to 17e and the negative electrode laminated surfaces 18a to 18e via a 25 ⁇ m thick microporous polyethylene film.
- This electrode plate group 1 is housed in a sealed location 5, and 1 ML iPF 6 / EC—EMC electrolyte is injected 500-1 and the opening of the sealed case 5 is sealed by the cap case 4 via the gasket 6. did.
- This work was performed in dry air, and the electrical connection between the electrode group 1 and the cap case 4 and the sealing location 5 was made by pressure welding.
- the configurations of the positive electrode plate material and the negative electrode plate material are the same as those of the coin type battery A described above.
- the positive electrode plate 11 was made 17 mm wide and 105 mm long, and the negative electrode plate 12 was made 18 mm wide and 107 mm long, and the positive electrode laminated surface 13 a ⁇ l was sandwiched via a 25 m thick microporous polyethylene film.
- 3 e and the negative electrode laminated surfaces 21 a to 21 e are wound so as to be laminated to form an electrode plate group 2 having a thickness of about 28 mm.
- the electrode group 2 is housed in the sealing case 5 and lMLiP F 6ZEC—500 / 1 of EMC electrolyte is injected, and the opening of the sealing case 5 is sealed by the cap case 4 through the gasket 6. did.
- the electrical connection between the electrode group 2 and the cap case 4 and the sealing case 5 was made by pressure welding.
- the positive electrode pellet 32 is prepared by dispersing 5 parts by weight of PTFE in water, adding 85 parts by weight of LiCo 2 as an active material and 10 parts by weight of graphite as a conductive agent, and mixing and dispersing the mixture at 100 ° C. After drying with hot air for one hour, the mixture was adjusted to the positive electrode mixture. 400 mg was filled and formed into a pellet by pressing 5 tons, and this was formed by hot air drying at 200 ° C. for 5 hours.
- the negative electrode pellet 33 is prepared by dispersing 5 parts by weight of SBR in water, adding 95 parts by weight of a calcined product of 2500 ° C as an active material, mixing and dispersing the mixture, and drying with hot air at 100 ° C for 2 hours.
- the mixture was adjusted to a negative electrode mixture, filled in a pellet molding machine having a diameter of 25 mm with 60 Omg, pressed into a pellet by pressing 5 tons, and dried by hot air drying at 110 ° C. for 5 hours.
- the negative electrode plate 33 is inserted into an assembly part obtained by combining a gasket 36 made of polypropylene and a sealing case 35, and a separator made of a non-woven fabric made of polyethylene having a thickness of 15 Ozm is placed thereon. Buy evening 34. In this state, after injecting 50 ml of an electrolytic solution of lMLiP F 6 / EC-EMC, the positive electrode pellet 32 was introduced, the cap case 31 was sealed to the location 35, and the force was sealed.
- Table 1 and FIG. 10 show the results of an experiment for measuring the initial internal resistance and discharge load characteristics of each of the ten coin-shaped batteries A, B, and C.
- the pellet-shaped pole In the case of a coin-shaped battery C using a plate, the discharge rate is about 80% at 10 mA and about 20% at 50 mA, and almost no discharge capacity is obtained at 100 mA. On the other hand, in the case of the coin batteries A and B according to the present invention, it can be seen that a discharge capacity of 90% or more is maintained even when discharging at 100 mA.
- the coin batteries A, B, and C described above are secondary batteries
- the primary battery can be similarly configured, and the same discharge characteristics can be obtained.
- a coin-type battery according to a second embodiment of the present invention shows a lithium ion secondary battery as an example, as in the first embodiment.
- a coin-shaped battery D according to the second embodiment is wound in a battery case in which the opening of a shallow bottomed cylindrical sealing case 5 is closed by a cap case 4 via a gasket 6. It is configured to house the electrode plate group 10 having a structure.
- Elements common to the configuration of the first embodiment are denoted by the same reference numerals.
- the electrode plate group 10 is formed by winding a positive electrode plate 7a and a negative electrode plate 8a shown in FIGS. 12A and 12B through a separator 9 as shown in FIG. You.
- the positive electrode plate 7a is formed by punching out an electrode plate material coated with positive electrode material on both sides of a positive electrode current collector made of aluminum foil, and forming an arc in the width direction as shown in Fig. 12A.
- a number of positive electrode laminated surfaces 17a to 17e were connected to each other by positive electrode connecting pieces 19a to 19d to form a belt shape, and the positive electrode material was not applied to one end side to expose the positive electrode current collector.
- a positive electrode lead 15 is provided.
- the negative electrode plate 8a For the negative electrode plate 8a, a required number of negative electrode laminates were formed by punching out an electrode plate material in which negative electrode material was applied to both sides of a copper foil negative electrode current collector and forming an arc in the width direction as shown in Fig. 12B. Negative electrode material is applied to one end of the strip formed by connecting surfaces 18a to 18e with negative electrode connecting pieces 20a to 20d. Instead, a negative electrode lead 16 exposing the negative electrode current collector is provided. If the width of the negative electrode plate 8a is formed to be slightly larger than the width of the positive electrode plate 7a, the positive electrode laminated surface 17a to 17e and the negative electrode laminated surface 18a to 18e face each other. The reaction area does not decrease even if displacement occurs when
- the positive electrode plate 7a and the negative electrode plate 8a are connected by a positive electrode laminated surface 17a to 17e and a negative electrode laminated surface 18a to 18e via a separator 9 as shown in FIG.
- the positive electrode connecting pieces 19a to 19d and the negative electrode connecting pieces 20a to 20d are bent and flatly wound so that they are stacked facing each other.
- the separator 9 is formed by forming a microporous polyethylene film into a tape shape, and has a tape shape having a width larger than the width of the negative electrode plate 8a. After the separator 9 is wound together with the positive electrode plate 7a and the negative electrode plate 8a, four corners are cut off in an arc shape to form a disk-shaped electrode plate group 10.
- the length of the connecting pieces 19 a to l 9 d and the negative electrode connecting pieces 20 a to 20 d in the connecting direction needs to be longer for the connecting pieces located on the outer side of the winding.
- FIGS. 12A and 12B from the length of the connecting piece located at the beginning of winding to the length of the connecting piece located at the end of winding, the positive electrode plate 7a, the negative electrode plate 8a and Separate the thickness of the evening 9 to increase sequentially.
- the tip of the positive electrode lead 15 is welded to the inner surface of the cap case 4, and the tip of the negative electrode lead 16 is welded to the inner surface of the sealing case 5.
- the cathode lead 15 is made of aluminum because an aluminum box is used as the cathode current collector when lithium cobaltate or the like is used as the cathode active material.
- the cap case 4 is generally made of stainless steel, and it is not easy to weld aluminum to stainless steel. Therefore, the cap case 4 in the present embodiment is formed of aluminum cladding on the inner side and stainless steel on the outer side.
- the welding of the positive electrode lead 15 to the cap case 4 is welding of aluminum to each other, and furthermore, by applying ultrasonic welding, it is surely welded.
- the negative electrode lead 16 is made of copper, and the negative electrode lead 16 is made of stainless steel.
- the welding to the mouth case 5 is performed by resistance welding or ultrasonic welding.
- the positive electrode lead 15 and the negative electrode lead 16 are folded so that the electrode plate group 10 is closed and the sealing case 5 Then, the electrolyte solution is injected into the container, and the opening of the sealing case 5 is sealed with the cap case 4 via the gasket 6 to form a coin-shaped battery D.
- the cap case 4 serves as the positive terminal of the coin-shaped battery D
- the sealing case 5 serves as the negative terminal
- both are insulated by the gas case 6.
- FIG. 14A to FIG. 14C show the configuration of the electrode group 55 having a folding structure.
- the positive electrode plate 41 is formed by applying a positive electrode material 47 to one surface of a positive electrode current collector 45
- 2 is formed by applying a negative electrode material 46 to one surface of a negative electrode current collector 44.
- the positive electrode current collector 45 at one end of the positive electrode plate 41 extends as a positive electrode lead 15, and the negative electrode current collector 44 at the other end of the negative electrode plate 42 extends as a negative electrode lead 16.
- This positive electrode plate 41 has a belt-like shape in which positive electrode laminated surfaces 50 having arcs formed on both sides are connected by connecting portions 51 as shown in FIG. 15A.
- the negative electrode plate 42 has a band shape in which negative electrode laminated surfaces 52 having arcs formed on both sides are connected by connecting portions 53.
- the positive electrode plate 41 and the negative electrode plate 42 are placed so that the surface coated with the positive electrode material and the surface coated with the negative electrode material face each other through the separator 9 as shown in FIG.
- an electrode group 55 having the same planar shape as the electrode group 1 shown in FIG. 2 is obtained.
- the electrode group 55 includes a positive electrode lead 15 welded to the cap case 4, a negative electrode lead 16 welded to the sealing location 5, and then housed in the cap case 4.
- the coin is sealed by a sealing location 5 via 6 to form a coin-type battery having an increased opposing area of the positive and negative electrodes.
- the positive electrode lead 15 is The battery D in which the negative electrode lead 16 is connected to the sealing case 5 by welding and the electrode group having the winding structure shown in Fig. 1 are used in the case 4 and the positive electrode plate is used as the cap case and the negative electrode plate is used as the sealing location.
- the results of a comparative verification of battery A connected by pressure welding to the battery are shown below. Na us, any cell in diameter 3 Omm, were compared formed on coin thickness 3. 2 mm c (1) Configuration of Battery D
- the positive electrode plate 7a has both sides of an aluminum foil having a thickness of 20 zm, dissolving Porifudzu of Piniriden 3 parts by weight N- methylpyrrolidone 38 parts by weight, to which L i C o0 2 50 parts by weight as an active material, a conductive agent After adding 9 parts by weight of graphite and mixing and dispersing the cathode material under an inert atmosphere, apply a uniform thickness in the air, dry at 120 ° C for 1 hour, and then The rolled positive electrode plate material was punched out to form a shape shown in FIG. 12A, in which the width of the positive electrode laminated surfaces 17a to 17e was 22 mm.
- the negative electrode plate 8a is made by dissolving 3 parts by weight of polyvinylidene fluoride in 38 parts by weight of N-methylpyrrolidone on both sides of a copper foil with a thickness of 20 ⁇ m, and then adding 9% by weight of a co-fired product at 2500 ° C.
- the negative electrode material mixed and dispersed under an inert atmosphere was applied in the air to a uniform thickness, dried at 120 ° C for 1 hour, and then rolled to a thickness of 200 ⁇ m.
- the negative electrode plate was punched to form a negative electrode laminated surface 18a to 18e having a width of 24 mm as shown in FIG. 12B.
- the positive electrode plate 7a and the negative electrode plate 8a having the above configuration are connected to each other through a 25 ⁇ m-thick microporous polyethylene film through a positive electrode laminated surface 17a to 17e and a negative electrode laminated surface 18a to 18e.
- a positive electrode laminated surface 17a to 17e and a negative electrode laminated surface 18a to 18e are wound so as to be laminated so as to form an electrode plate group 10 having a thickness of about 2.8 mm, and the tip of the positive electrode lead 15 is ultrasonically welded to the inner surface of the cap case 4, and the tip of the negative electrode lead 16 is formed.
- the part was resistance-welded to the inner surface of the sealing location 5.
- the electrode group 10 is accommodated in the sealed location 5, and 1 ML iPF 6 / EC—EMC electrolyte is injected 500 ⁇ 1 and the opening of the sealed location 5 is inserted through the gasket 6 into the cap case.
- the cell was sealed with 4, and Battery D was prepared.
- the positive electrode plate 7 and the negative electrode plate 8 of the electrode plate group 1 have a configuration in which the positive electrode lead and the negative electrode lead are not provided as shown in FIGS. 3A and 3B, and as shown in FIG. 1 positive plate 7
- the cap case 4, the negative electrode plate 8 and the sealing case 5 are electrically connected by pressure welding. Since this pressure welding is performed, the positive electrode material is not applied to the positive electrode laminated surface 17e, which is the outermost surface of the positive electrode plate 7 on the cap case 4 side, and the positive electrode current collector is exposed. Further, the negative electrode material is not applied to the negative electrode laminated surface 18e, which is the outermost surface on the sealing case 5 side of the negative electrode plate 8, and the negative electrode current collector is exposed.
- FIG. 16 and 17 show the results of measurements of the change in resistance and the total battery height.
- the change in the internal resistance value shown in Fig. 16 when battery D and battery A are compared, in battery D according to the second embodiment, the internal resistance value remains low until battery A has passed the storage period. There is a big difference from the sudden rise. This is considered to be due to the effect of the electrical connection made by welding in Battery D.
- the generation of gas in the battery is confirmed from the change in the total battery height shown in Fig. 17, there is no significant difference between Battery D and Battery A.
- the present invention provides a coin-type battery having a low internal resistance without impairing the stability of current collection.
- the area of opposing electrode plates is almost equal, so that the charge / discharge reaction does not concentrate on a part, I can't.
- the laminated surface of the negative electrode plate at the innermost periphery of the wound negative electrode plate faces the laminated surface of the positive electrode plate via the separator.
- the capacity of the positive and negative plates facing each other is almost the same.
- the nearest end of the winding end of the negative electrode plate in the direction of the center of the winding is opposed so as to be taken into the connecting portion located on the most winding center side of the positive electrode plate. It is heavily biased. For this reason, it was obtained that lithium ions detached from the positive electrode during charging could not be occluded between the layers of the carbon material of the negative electrode plate, and excess lithium ions were deposited on the surface of the negative electrode plate.
- the electrode groups according to the third to fifth embodiments suppress the deposition of lithium metal by reducing the current density at the winding end of the negative electrode plate in the center direction.
- the inner peripheral surface side of the connecting portion located closest to the winding center of the positive electrode plate facing the winding end of the negative electrode plate is covered with an insulating member. With this configuration, the amount of lithium ions released from the connection portion of the positive electrode plate is reduced, and the deposition of lithium metal on the opposing negative electrode portion is suppressed.
- the insulating member a material having ion impermeability that impedes transmission of lithium ions is more preferable.
- the coin-shaped battery according to the third embodiment is formed as shown in FIG.
- the electrode plate group 30 used for this was a positive electrode plate 37 shown in FIG. 18A and a negative electrode plate 38 shown in FIG. 18B. As shown in FIG. 19, this is formed by winding through a separator 9.
- the required number of positive electrodes 37 are formed by punching out an electrode material coated with a positive electrode material on both sides of a positive electrode current collector in an aluminum box. It is formed in a belt shape in which the laminated surfaces 17a to 17e are connected by the positive electrode connecting pieces 19a to 19d.
- the insulating member 48 is formed on the positive electrode connecting piece 19a located closest to the center of the winding of the positive electrode, and as shown in FIG. 19, is wound around the winding end of the negative electrode plate 38 when wound. It is located only on the opposing surface.
- the insulating member 48 is more preferably a member having ion impermeability that impedes the transmission of lithium ions.
- a method of forming the insulating member 48 on the positive electrode plate 37 a method of applying a resin adhesive or a method of attaching a resin tape coated with an adhesive satisfying the above-mentioned respective stability is employed. Adhesives and tapes based on polypropylene are preferred.
- the negative electrode plate 38 a required number of circular plates formed by punching out an electrode plate material in which a negative electrode material is applied to both surfaces of a copper foil negative electrode current collector and forming an arc in the width direction as shown in FIG.
- the negative electrode laminated surfaces 18 & to 18 6 are formed in a strip shape connected by negative electrode connecting pieces 20 & to 20 (1.
- the width of the negative electrode plate 38 is, as shown in the figure, the width of the positive electrode plate 37. If the width is slightly larger than the width, the reaction area does not decrease even if the position where the positive electrode laminated surface 17a to 17e and the negative electrode laminated surface 18a to 18e face each other is shifted. .
- the positive electrode plate 37 and the negative electrode plate 38 have a positive electrode laminated surface 17 a to 17 e and a negative electrode laminated surface 18 a to 18 e separated from each other.
- the insulating member 48 formed on the positive electrode connecting piece 19a is arranged so as to be located only on the surface facing the winding end of the negative electrode plate 38.
- the separator 9 is a tape formed from a microporous polyethylene film in a tape shape.
- the tape 9 is formed in a tape shape having a width larger than the width of the negative electrode plate 38, and is formed together with the positive electrode plate 37 and the negative electrode plate 38. After being wound, the four corners are cut off in an arc shape to form a disk-shaped electrode group 30.
- the positive electrode plate 37 and the negative electrode plate 38 are connected to the positive electrode laminated surface 17 a to 17 e and the negative electrode laminated surface 18 a to To wind so that 18 e is stacked facing directly, the length in the connection direction of the positive electrode connecting pieces 19 a to l 9 d and the negative electrode connecting pieces 20 a to 20 d should be It is necessary to make it longer as you turn it.
- the thickness of positive electrode plate 37, negative electrode plate 38, and separator 9 are sequentially increased from the winding start length a to the winding end length d to add Let me do it.
- the width W1 of the positive electrode connecting pieces 19a to I; 9d and the width W2 of the negative electrode connecting pieces 20a to 20d are as large as possible in order to reduce a decrease in the battery voltage during charging and discharging with a large current. It is formed in a suitable width.
- the widths W1 and W2 of the positive electrode connecting pieces 19a to 19d and the negative electrode connecting pieces 20a to 20d Is smaller, but the width W1 and W2 of the positive electrode connecting pieces 19a to 19d and the negative electrode connecting pieces 20a to 20d are determined depending on the degree of battery voltage drop and volumetric efficiency. .
- the electrode plate group 30 having the above configuration is accommodated in the sealing case 5, an electrolyte is injected, and the opening of the sealing case 5 is covered with the cap case 4 via the gasket 6, and the opening end of the cap case 4 is opened. Is bent inward and sealed by crimping to form a coin-shaped battery.
- the coin-shaped battery according to the third embodiment is insulated from the vicinity of the winding end of the negative electrode plate 38 and to the positive electrode plate 37 opposed thereto. Since the member 48 is formed, the amount of lithium ions desorbed from the positive electrode plate 37 into the nonaqueous electrolyte during charging is reduced, and the deposition of lithium metal on the negative electrode plate 37 is suppressed. The deterioration of cycle life and the reduction of safety are improved.
- the coin-type battery according to the fourth embodiment has a configuration in which this portion is replaced with an uncoated portion of the positive electrode material instead of the insulating member 48 formed on the positive electrode connecting piece 19a in the third embodiment. is there.
- the positive electrode plate 57 For the positive electrode plate 57, a required number of positive electrode products were formed by punching out an electrode plate material in which a positive electrode material was applied to both sides of a positive electrode current collector made of aluminum foil and forming an arc in the width direction as shown in Figure 2OA. Layer surfaces 17a to L7e are formed in a belt shape by connecting positive electrode connecting pieces 19a to 19d.
- the uncoated portion 49 is obtained by applying the positive electrode material to the positive electrode connecting piece 19a located closest to the center of the winding, and this portion does not contribute to the discharge reaction. Furthermore, this uncoated portion 4 9 When the negative electrode plate 58 and the separator 9 shown in FIG. 20B are combined and wound, the negative electrode plate 58 is located only on the surface facing the winding end of the winding center direction.
- the positive electrode plate 57 and the negative electrode plate 58 have a positive electrode laminated surface 17 a to 17 e and a negative electrode laminated surface 18 a to 18 e separated from each other.
- the positive electrode connecting pieces 19 & to 1901 and the negative electrode connecting pieces 20 & ⁇ 20 (are bent at 1 and wound so as to face each other via the connecting piece 9.
- the uncoated portion 49 is formed so as to face only the surface facing the winding end of the negative electrode plate 58 in the winding center direction.
- the uncoated portion 49 is formed on the opposite side of the positive electrode plate 57 near the winding end of the negative electrode plate 58 in the center direction.
- the inner peripheral surface of the positive electrode connecting piece 19a of the positive electrode plate 57 facing the winding end of the negative electrode plate 58 where lithium metal is likely to be deposited is not coated with the positive electrode material.
- the lithium ions released from the positive electrode plate 57 into the non-aqueous electrolyte during charging are reduced, and the lithium-metal deposition on the negative electrode surface deteriorates the charge / discharge cycle life and reduces safety. Improve the drop.
- the coin-type battery according to the fifth embodiment is different from the third embodiment in that an insulating member 50 is provided on the winding end of the negative electrode plate 68 instead of the insulating member 48 formed on the positive electrode connecting piece 19a in the third embodiment. It is a configuration that is arranged.
- the required number of positive electrodes formed by punching out an electrode plate material in which a positive electrode material is applied to both sides of an aluminum foil positive electrode current collector and forming an arc in the width direction as shown in Fig. 22A It is formed in a belt-like shape in which the laminated surfaces 17a to 17e are connected by the positive electrode connecting pieces 19a to 19d.
- the negative electrode plate 68 a required number of negative electrodes formed by punching out an electrode plate material having negative electrode material applied to both sides of a copper foil negative electrode current collector and forming an arc in the width direction as shown in FIG. 22B.
- the laminated surfaces 18a to 18e are formed in a belt-like shape by connecting the negative electrode connecting pieces 20a to 20d.
- An insulating member 50 is formed at the end of the winding of the negative electrode plate 68.
- the positive electrode connecting piece 19 a The winding end portion of the negative electrode plate 68 facing this is configured to be covered with the insulating member 50.
- the insulating member 50 has an ion impermeability that impedes the transmission of lithium ions.
- a member is preferred. It is also required to have chemical stability against non-aqueous solvents and stability against potential applied during charging.
- a method for forming the negative electrode plate 68 a method of applying a resin adhesive or a method of applying a resin tape coated with an adhesive satisfying the above-mentioned respective stability is suitable in terms of productivity. Adhesives and tapes based on polypropylene are preferred.
- the positive electrode plate 67 and the negative electrode plate 68 have a positive electrode laminated surface 17 a to 17 e and a negative electrode laminated surface 18 a to 18 e which are separated from each other.
- the positive electrode connecting pieces 19 a to l 9 d and the negative electrode connecting pieces 20 a to 20 d are bent and wound so as to be laminated face-to-face through the electrode 9 to form an electrode plate group 70.
- the insulating member 50 formed at the winding end of the negative electrode plate 68 is arranged so as to face only the inner surface side of the positive electrode connecting piece 19a.
- the winding end of the negative electrode plate 68 on which lithium metal is easily deposited is covered with an insulating member 50, and the surface of the winding end of the negative electrode plate 68 is made of lithium gold. Improving the deterioration of the charge / discharge cycle life and the reduction of safety by keeping the metals free from precipitation.
- the positive electrode plate 3 7 both sides of an aluminum foil having a thickness of 2 0 ⁇ M, dissolving Porifudzu fluoride 3 parts by weight of 3 8 parts by weight N _ methylpyrrolidone, L i C o 0 2 5 thereto as an active material 0 parts by weight and 9 parts by weight of graphite as a conductive agent were added, and the cathode material mixed and dispersed under an inert atmosphere was applied in a uniform thickness in the air, and then rolled to a thickness of 18 ⁇ .
- the dried positive electrode plate material was dried at 120 ° C for 1 hour, punched out, and the width of the positive electrode laminated surface 17 a to l 7 e was 22 mm as shown in Figure 18A.
- An electrode plate was obtained.
- An insulating member 48 was formed in the area of the connecting piece 19a of the positive electrode plate 37.
- the insulating member 48 is formed by applying an adhesive mainly composed of polypropylene and curing the applied adhesive.
- the negative electrode plate 38 was prepared by dissolving 3 parts by weight of polyvinylidene fluoride in 38 parts by weight of N-methylpyrrolidone on both sides of a 20-zm-thick copper foil, and firing the mixture at 250 ° C.
- Product 5 Add 9 parts by weight and mix and disperse the negative electrode material in an inert atmosphere to a uniform thickness in air.
Description
Claims
Priority Applications (3)
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KR1020037001851A KR100710969B1 (ko) | 2000-08-09 | 2001-08-09 | 코인형 전지 |
JP2002518557A JP4020781B2 (ja) | 2000-08-09 | 2001-08-09 | コイン形電池 |
EP01955642A EP1318561A4 (en) | 2000-08-09 | 2001-08-09 | COINFUL BATTERY |
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JP2000-241679 | 2000-08-09 | ||
JP2000241679 | 2000-08-09 | ||
JP2000-241678 | 2000-08-09 | ||
JP2000241678 | 2000-08-09 | ||
JP2001136015 | 2001-05-07 | ||
JP2001-136015 | 2001-05-07 |
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PCT/JP2001/006884 WO2002013305A1 (en) | 2000-08-09 | 2001-08-09 | Coin-shaped battery |
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US (1) | US20030162088A1 (ja) |
EP (1) | EP1318561A4 (ja) |
JP (1) | JP4020781B2 (ja) |
KR (1) | KR100710969B1 (ja) |
CN (1) | CN1221055C (ja) |
TW (1) | TW511305B (ja) |
WO (1) | WO2002013305A1 (ja) |
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JP2004139800A (ja) * | 2002-10-16 | 2004-05-13 | Dainippon Printing Co Ltd | 非水電解液電池、及びその極板 |
JP2005032671A (ja) * | 2003-07-11 | 2005-02-03 | Hitachi Maxell Ltd | コイン形非水二次電池 |
JP2005071640A (ja) * | 2003-08-27 | 2005-03-17 | Toshiba Battery Co Ltd | 扁平形非水電解質二次電池 |
JP2005310578A (ja) * | 2004-04-22 | 2005-11-04 | Matsushita Electric Ind Co Ltd | コイン形二次電池 |
WO2006059854A1 (en) * | 2004-12-02 | 2006-06-08 | Lg Chem, Ltd. | Copper collector for secondary battery comprising cu-nitrile compound complex formed on surface thereof |
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- 2001-08-09 WO PCT/JP2001/006884 patent/WO2002013305A1/ja active Application Filing
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JP2004139800A (ja) * | 2002-10-16 | 2004-05-13 | Dainippon Printing Co Ltd | 非水電解液電池、及びその極板 |
JP2005032671A (ja) * | 2003-07-11 | 2005-02-03 | Hitachi Maxell Ltd | コイン形非水二次電池 |
JP4563002B2 (ja) * | 2003-08-27 | 2010-10-13 | 日立マクセル株式会社 | 扁平形非水電解質二次電池 |
JP2005071640A (ja) * | 2003-08-27 | 2005-03-17 | Toshiba Battery Co Ltd | 扁平形非水電解質二次電池 |
JP2005310578A (ja) * | 2004-04-22 | 2005-11-04 | Matsushita Electric Ind Co Ltd | コイン形二次電池 |
US8192872B2 (en) | 2004-12-02 | 2012-06-05 | Lg Chem, Ltd. | Copper collector for secondary battery comprising Cu-nitrile compound complex formed on surface thereof |
WO2006059854A1 (en) * | 2004-12-02 | 2006-06-08 | Lg Chem, Ltd. | Copper collector for secondary battery comprising cu-nitrile compound complex formed on surface thereof |
US8372543B2 (en) | 2004-12-02 | 2013-02-12 | Lg Chem, Ltd. | Copper collector for secondary battery comprising Cu-nitrile compound complex formed on surface thereof |
JP2017162777A (ja) * | 2016-03-11 | 2017-09-14 | セイコーインスツル株式会社 | 電気化学セル及び電気化学セルの製造方法 |
JP2020080277A (ja) * | 2018-11-14 | 2020-05-28 | セイコーインスツル株式会社 | 電気化学セル |
JP2020080283A (ja) * | 2018-11-14 | 2020-05-28 | セイコーインスツル株式会社 | 電気化学セル |
JP2020087914A (ja) * | 2018-11-14 | 2020-06-04 | セイコーインスツル株式会社 | 電気化学セル |
US11495832B2 (en) | 2018-11-14 | 2022-11-08 | Seiko Instruments Inc. | Electrochemical cell |
JP7320411B2 (ja) | 2018-11-14 | 2023-08-03 | セイコーインスツル株式会社 | 電気化学セル |
Also Published As
Publication number | Publication date |
---|---|
KR100710969B1 (ko) | 2007-04-24 |
CN1221055C (zh) | 2005-09-28 |
JP4020781B2 (ja) | 2007-12-12 |
KR20030051612A (ko) | 2003-06-25 |
TW511305B (en) | 2002-11-21 |
EP1318561A4 (en) | 2006-12-20 |
US20030162088A1 (en) | 2003-08-28 |
CN1461503A (zh) | 2003-12-10 |
EP1318561A1 (en) | 2003-06-11 |
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