WO2013076831A1 - 二次電池の製造方法、及び、二次電池 - Google Patents
二次電池の製造方法、及び、二次電池 Download PDFInfo
- Publication number
- WO2013076831A1 WO2013076831A1 PCT/JP2011/076968 JP2011076968W WO2013076831A1 WO 2013076831 A1 WO2013076831 A1 WO 2013076831A1 JP 2011076968 W JP2011076968 W JP 2011076968W WO 2013076831 A1 WO2013076831 A1 WO 2013076831A1
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- WIPO (PCT)
- Prior art keywords
- valve body
- secondary battery
- current
- positive electrode
- current collecting
- Prior art date
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 35
- 238000003466 welding Methods 0.000 claims abstract description 71
- 239000011888 foil Substances 0.000 claims abstract description 69
- 229910052751 metal Inorganic materials 0.000 claims abstract description 69
- 239000002184 metal Substances 0.000 claims abstract description 69
- 238000013016 damping Methods 0.000 claims abstract description 67
- 230000008878 coupling Effects 0.000 claims abstract description 13
- 238000010168 coupling process Methods 0.000 claims abstract description 13
- 238000005859 coupling reaction Methods 0.000 claims abstract description 13
- 229910000838 Al alloy Inorganic materials 0.000 claims description 24
- 229910052782 aluminium Inorganic materials 0.000 claims description 24
- KCZFLPPCFOHPNI-UHFFFAOYSA-N alumane;iron Chemical compound [AlH3].[Fe] KCZFLPPCFOHPNI-UHFFFAOYSA-N 0.000 claims description 23
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 229910045601 alloy Inorganic materials 0.000 claims description 10
- 239000000956 alloy Substances 0.000 claims description 10
- 239000007769 metal material Substances 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 3
- 230000005611 electricity Effects 0.000 abstract 8
- 238000002604 ultrasonography Methods 0.000 abstract 6
- 238000007789 sealing Methods 0.000 description 34
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 7
- 239000011347 resin Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 239000007773 negative electrode material Substances 0.000 description 4
- 239000007774 positive electrode material Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000011889 copper foil Substances 0.000 description 3
- 239000008151 electrolyte solution Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000011162 core material Substances 0.000 description 2
- 238000002788 crimping Methods 0.000 description 2
- 239000002003 electrode paste Substances 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 229910001000 nickel titanium Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- -1 M2052 damping alloy Chemical class 0.000 description 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000011255 nonaqueous electrolyte Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
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- H—ELECTRICITY
- 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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
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- H01M4/70—Carriers or collectors characterised by shape or form
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
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- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/536—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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- 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
- H01M50/574—Devices or arrangements for the interruption of current
- H01M50/578—Devices or arrangements for the interruption of current in response to pressure
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- H01M2200/00—Safety devices for primary or secondary batteries
- H01M2200/20—Pressure-sensitive devices
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- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/172—Arrangements of electric connectors penetrating the casing
- H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
- H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/547—Terminals characterised by the disposition of the terminals on the cells
- H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/552—Terminals characterised by their shape
- H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
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- 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
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- H01M50/562—Terminals characterised by the material
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/564—Terminals characterised by their manufacturing process
- H01M50/567—Terminals characterised by their manufacturing process by fixing means, e.g. screws, rivets or bolts
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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 method for manufacturing a secondary battery including a pressure-type current interrupting mechanism that interrupts a current flowing through the battery case when the internal pressure of the battery case exceeds the operating pressure, and to such a secondary battery.
- Patent Document 1 discloses a battery provided with a pressure-type current interrupting mechanism that interrupts current when the internal pressure of the battery case increases in order to increase the safety of the battery.
- the pressure-type current interruption mechanism has a valve portion that is structured to break and interrupt current when the internal pressure of the battery case increases. For this reason, when the current collector foil of the electrode plate and the current collector member are connected using ultrasonic welding, not only the current collector member but also the member that forms the valve portion of the current interrupting mechanism connected to the current collector member by ultrasonic vibration. However, it may vibrate greatly. Then, due to the ultrasonic vibration, the above-described valve portion is broken, and the current interrupting mechanism is erroneously operated, which may deteriorate the yield of battery manufacturing.
- the present invention has been made in view of the current situation, and in a secondary battery having a current interruption mechanism, the current interruption mechanism is prevented from being erroneously operated due to ultrasonic vibration caused by ultrasonic welding during manufacturing.
- An object of the present invention is to provide a secondary battery manufacturing method with improved yield and a secondary battery having high reliability with respect to a current interruption mechanism.
- an electrode body having an electrode plate including a current collector foil is connected to the current collector foil of the electrode plate by ultrasonic welding at its own ultrasonic weld.
- a current collecting member and a pressure type current interrupting mechanism electrically connected to the current collecting member are hermetically housed in a battery case, and the current interrupting mechanism is integrated with the current collecting member.
- the first valve body and the second valve body are connected by a connecting portion, and at least one of the first valve body and the second valve body is in a direction in which the mutual connection breaks due to an increase in the internal pressure of the battery case.
- At least a part between the ultrasonic welded portion and the connecting portion is a vibration-damping property.
- a structure forming step of forming a structure in which one valve body and the second valve body are connected by the connecting portion; and after the structure forming step, the current collecting foil of the electrode plate and the current collecting member An ultrasonic welding process for ultrasonically welding the ultrasonic welded portion.
- the secondary battery according to this manufacturing method has a configuration in which at least one of the first valve body and the second valve body connected through the connecting portion moves in a direction in which the mutual coupling breaks due to an increase in the internal pressure of the battery case.
- a pressure-type current interruption mechanism is included in this battery manufacturing method.
- At least a part between the ultrasonic welded portion and the connecting portion of the current collecting member, the first valve body, and the second valve body may be made of a damping metal.
- the current collecting member, the first valve body, and the second valve body are made of the same vibration-damping metal.
- damping metal examples include iron-aluminum alloy, M2052 damping alloy in which copper, nickel, and iron are added based on manganese, cast iron, magnesium alloy, ferritic stainless steel, nickel-titanium alloy, and the like. .
- connection part the site
- portion to be broken is provided in the first valve body or the second valve body, and is configured such that the coupling between the first valve body and the second valve body is released by the breakage due to the increase in internal pressure.
- part formed weaker than other parts such as the above-mentioned connection part, the marking part formed in the 1st valve body or the 2nd valve body, and the thin part, etc. are mentioned.
- the current collector foil, the current collector, the first valve body, and the second valve body are all made of a metal material containing the same metal element.
- the damping metal may be a method for manufacturing a secondary battery which is an alloy of the metal element and a different metal element different from the metal element.
- the current collector foil, the current collector, the first valve body, and the second valve body are made of a metal material containing the same metal element.
- the damping metal uses an alloy of the same metal element and a different metal element different from the same metal element.
- ultrasonic welding between current collection foil and the ultrasonic welding part of a current collection member can be performed easily.
- the first valve body and the second valve body can be connected to each other (structure of the connecting portion) with a metal material containing the same metal element. For this reason, a reliable secondary battery is obtained about ultrasonic welding and formation of a connection part.
- the first valve body and the second valve body are made of the same damping metal, and the structure forming step includes the first valve body and the first valve body. It is good to set it as the manufacturing method of a secondary battery including the welding process which couple
- the structure forming step of the battery manufacturing method includes a step of welding the first valve body and the second valve body made of the same vibration-damping metal.
- the reliability of welding can be improved.
- the ultrasonic vibration can be absorbed by the first valve body, but also the ultrasonic vibration can be absorbed in a path that is transmitted from the first valve body to the second valve body through the connecting portion. it can. Accordingly, the first valve body and the second valve body can be reliably coupled at the connection portion, and the connection portion or breakage between the first valve body and the second valve body of the current interrupting mechanism is caused by ultrasonic vibration during ultrasonic welding.
- the first valve body and the current collecting member may be a method for manufacturing a secondary battery made of an integral material of the damping metal.
- the first valve body and the current collecting member made of an integral material of damping metal are used. Thereby, it is not necessary to couple
- the ultrasonic vibration can be absorbed not only by the first valve body but also by the current collecting member. Therefore, the ultrasonic vibration during ultrasonic welding more reliably suppresses the breakage of the coupling between the first valve body and the second valve body of the current interrupting mechanism at the connecting portion or the planned breaking portion, and further yields.
- a secondary battery can be manufactured well. In addition, it is possible to further suppress the influence of the ultrasonic vibration on the connecting portion and the planned fracture portion, and the current interrupting mechanism becomes a more reliable secondary battery.
- Another aspect of the present invention for solving the above problems is to connect an electrode body having an electrode plate including a current collector foil to the current collector foil of the electrode plate by ultrasonic welding at its own ultrasonic weld.
- a pressure type current interrupting mechanism electrically connected to the current collecting member is hermetically accommodated in a battery case, and the current interrupting mechanism is integrated with the current collecting member.
- the first valve body and the second valve body are connected by a connecting portion, and at least one of the first valve body and the second valve body is broken in connection with each other due to an increase in the internal pressure of the battery case. And at least a part of the current collecting member, the first valve body, and the second valve body between the ultrasonic welded portion and the connecting portion is dampened.
- Secondary battery made of a conductive metal.
- the battery includes a current collecting member, a first valve body, and a second valve body, wherein at least a part between the ultrasonic welded portion and the connecting portion is made of a damping metal, and then the current collecting of the electrode plate is performed.
- the foil and the current collecting member are connected by ultrasonic welding. For this reason, at the time of ultrasonic welding of the current collector foil of the electrode plate and the current collecting member, ultrasonic vibration transmitted from the ultrasonic welded portion toward the connecting portion is absorbed at least during this time. Therefore, at the time of ultrasonic welding, not only the connection between the first valve body and the second valve body is prevented from breaking at the connection portion or the planned fracture portion, but also the connection portion or the planned fracture portion due to ultrasonic vibration is prevented. The influence can be suppressed and the secondary battery is highly reliable with little variation in the characteristics of the current interruption mechanism.
- the current collector foil, the current collecting member, the first valve body, and the second valve body are all made of a metal material containing the same metal element
- the damping metal is preferably a secondary battery that is an alloy of the above metal element and a different metal element different from the above metal element.
- the current collector foil, the current collector, the first valve body, and the second valve body are made of a metal material containing the same metal element.
- the damping metal is an alloy of the same metal element and a different metal element different from the same metal element.
- the first valve body and the second valve body are made of the same damping metal, and are joined by welding to constitute the connecting portion. And good.
- the first valve body and the second valve body are made of the same vibration-damping metal, and both are joined by welding to constitute a connecting portion.
- welding since welding is performed between the same materials, the reliability of welding is favorable.
- the first valve body and the current collecting member may be a secondary battery made of an integral material of the damping metal.
- the first valve body and the current collecting member are made of an integral material of damping metal. For this reason, even if a minute vibration due to a ripple current or the like occurs when the battery is used, it can be absorbed not only by the first valve body but also by the current collecting member. Therefore, the secondary battery having a higher reliability with respect to the current interruption mechanism is obtained.
- the current collector foil may be an aluminum foil
- the damping metal may be a secondary battery made of a damping iron-aluminum alloy.
- This battery uses a damping iron-aluminum alloy as a damping metal that forms an integral member of the first valve body and the current collecting member.
- This vibration-damping iron-aluminum alloy can be satisfactorily ultrasonically welded with aluminum. Therefore, the current collecting member made of the damping iron-aluminum alloy can be appropriately ultrasonically welded to the aluminum foil forming the current collecting foil.
- this battery is a secondary battery in which a vibration-damping metal is used for the current collecting member and the current collecting foil and the current collecting foil are well ultrasonically welded.
- the vibration-damping iron-aluminum alloy may be a secondary battery containing 6 to 10% by weight of aluminum, with the balance being iron and inevitable impurities.
- iron-aluminum alloys an alloy containing 6 to 10% by weight of aluminum and the balance being iron and inevitable impurities has particularly good damping properties as a damping alloy. Therefore, the secondary battery having higher reliability with respect to the current interruption mechanism is obtained.
- FIG. 1 is a perspective view of a lithium ion secondary battery according to Embodiment 1.
- FIG. 3 is an exploded perspective view showing a configuration of a negative electrode terminal according to Embodiment 1.
- FIG. 3 is a perspective view illustrating a configuration of a positive electrode terminal including a current interrupt mechanism according to Embodiment 1.
- FIG. 3 is an exploded perspective view showing a configuration of a positive electrode terminal including a current interrupt mechanism according to Embodiment 1.
- FIG. FIG. 4 is a longitudinal sectional view of the current interrupting mechanism according to the AA section in FIG.
- FIG. 6 is an explanatory diagram showing a hybrid vehicle according to a second embodiment.
- FIG. 1 is a perspective view of a lithium ion secondary battery 1 (hereinafter also simply referred to as battery 1) according to the first embodiment.
- battery 1 a lithium ion secondary battery 1 (hereinafter also simply referred to as battery 1) according to the first embodiment.
- the upper side in each drawing is described as the upper UW (upper UW) of the battery 1 and the lower side is described as the lower DW (lower DW) of the battery 1.
- the battery 1 includes an electrode body 20 having a positive electrode plate 21 and a negative electrode plate 22, a non-aqueous electrolyte solution 30, a rectangular battery case 10 that contains the electrode assembly 20 and the electrolyte solution 30 in an airtight manner, It has a positive electrode terminal 60 connected to the positive electrode plate 21 and extending out of the battery case 10, and a negative electrode terminal 70 connected to the negative electrode plate 22 and extended out of the battery case 10.
- the battery case 10 has a case body member 11 including an opening and a sealing lid 12.
- the sealing lid 12 has a rectangular plate shape, closes the opening of the case body member 11, and is welded to the case body member 11. Further, the sealing lid 12 is provided with a liquid injection hole 12H for injecting the electrolytic solution 30, and further, a part of the positive electrode external terminal 61 and the negative electrode terminal 70 which are a part of the positive electrode terminal 60. Negative external terminals 71 are fixed outside the battery case 10, respectively.
- the positive electrode external terminal 61 is composed of a bolt 62 and a positive electrode external terminal member 63 made of an aluminum plate bent in a crank shape (Z-shape), and is attached to the sealing lid 12 via an external gasket 80 made of resin. It is fixed.
- the negative external terminal 71 includes a bolt 72 and a negative external terminal member 73 made of a copper plate bent in a crank shape (Z shape), and is fixed to the sealing lid 12 via an external gasket 90 made of resin. Has been.
- the electrode body 20 is accommodated in an insulating film enclosure (not shown) in which an insulating film is formed in a bag shape, and is accommodated in the battery case 10 in a laid state.
- This electrode body 20 is obtained by winding a belt-like positive electrode plate 21 and a belt-like negative electrode plate 22 on each other via a belt-like separator (not shown) and compressing them into a flat shape.
- the positive electrode plate 21 has a positive electrode current collector foil 21s made of a strip-shaped aluminum foil as a core material.
- the positive electrode current collector foil 21s is provided with a positive electrode active material layer (not shown) made of a positive electrode active material, a conductive agent and a binder on both sides thereof, and one side of the positive electrode current collector foil 21s is formed on the positive electrode active material layer.
- the positive electrode lead portion 21f does not exist. In other words, the positive electrode lead portion 21 f is a portion of the positive electrode plate 21 where the positive electrode current collector foil 21 s made of aluminum foil is exposed.
- the negative electrode plate 22 has a negative electrode current collector foil 22s made of a strip-shaped copper foil as a core material.
- the negative electrode current collector foil 22s is provided with a negative electrode active material layer (not shown) made of a negative electrode active material, a binder, and a thickener on both sides thereof, and one side of the negative electrode current collector foil 22s has the negative electrode active material.
- the negative electrode lead portion 22f has no layer. That is, the negative electrode lead portion 22f is a portion of the negative electrode plate 22 where the negative electrode current collector foil 22s of the copper foil is exposed.
- a positive electrode terminal 60 is connected to the positive electrode lead portion 21f (positive electrode current collector foil 21s) of the positive electrode plate 21 (see FIGS. 1, 3, and 4).
- the positive electrode terminal 60 includes the above-described positive electrode external terminal 61 disposed outside the battery case 10, the current interrupt mechanism 2 located in the battery case 10, and a positive electrode current collecting member 64 ⁇ / b> B.
- the positive electrode current collecting member 64B is a part of a positive electrode internal conducting member 64 described later, and the positive electrode internal conducting member 64 is made of a damping iron-aluminum alloy.
- the positive electrode current collector 64B is bent in a crank shape and is ultrasonically welded to the positive electrode lead portion 21f (positive electrode current collector foil 21s) of the positive electrode plate 21.
- the current interrupt mechanism 2 is disposed in the battery case 10 and is interposed between the positive electrode current collecting member 64B and the positive electrode external terminal 61 (positive electrode external terminal member 63), and conducts between the two.
- This is a pressure-type safety mechanism that cuts off the charge / discharge current Id of the battery flowing through the battery when the internal pressure Pi of the battery exceeds the operating pressure Pf.
- a negative electrode terminal 70 is connected to the negative electrode lead portion 22f (negative electrode current collector foil 22s) of the negative electrode plate 22 (see FIGS. 1 and 2).
- the negative electrode terminal 70 includes a negative electrode current collecting member 74 ⁇ / b> B positioned in the battery case 10 in addition to the negative electrode external terminal 71 disposed outside the battery case 10.
- the negative electrode current collecting member 74B is a part of a negative electrode internal conducting member 74 described later, and the negative electrode internal conducting member 74 is made of copper.
- the negative electrode current collecting member 74B is bent in a crank shape and is resistance welded to the negative electrode lead portion 22f (negative electrode current collecting foil 22s) of the negative electrode plate 22.
- the sealing lid 12 of the battery case 10 has a positive electrode through hole 12C.
- the positive electrode external terminal 61 constituted by the bolt 62 and the positive electrode external terminal member 63 is connected to the positive electrode through hole 12C. It is fixed through.
- the external gasket 80 is formed in a substantially L shape, and has a bolt holding hole 80H and a through hole 80C forming a hexagonal columnar recess.
- the positive external terminal member 63 has two through holes 63B and 63C.
- the bolt 62 has a hexagonal columnar head portion 62 ⁇ / b> A inserted into the bolt holding hole 80 ⁇ / b> H of the external gasket 80, and a threaded portion 62 ⁇ / b> B inserted through one through hole 63 ⁇ / b> B of the positive electrode external terminal member 63.
- the other through hole 63C of the positive external terminal member 63 is coaxially aligned with the positive through hole 12C of the sealing lid 12 together with the through hole 80C of the external gasket 80.
- the current interruption mechanism 2 is arranged in the battery case 10 on the lower side DW of the positive electrode through hole 12C in the drawing.
- This current interruption mechanism 2 includes an annular plate-shaped seal rubber 81, a first internal gasket 82 made of resin, a sealing plug 67, a space forming member 66, a plate-shaped second valve body 65, and a second internal gasket 83 made of resin.
- a positive electrode internal conduction member 64 includes a first valve body 64A and a positive electrode current collecting member 64B.
- the space forming member 66 is made of aluminum, and has a bottomed rectangular tube-shaped space forming portion 66B having an opening 66H on the lower side DW in the drawing, and an upper side from the bottom 66BT of the upper UW in the drawing of the space forming portion 66B. It consists of a cylindrical caulking portion 66A extending to the UW. Further, the caulking portion 66A has a cylindrical hole 66C that penetrates to the space forming portion 66B. The cylindrical hole 66C is sealed with a sealing plug 67 made of aluminum, as will be described later.
- the first internal gasket 82 made of resin has a bottomed rectangular tube shape having an opening 82H on the lower side DW in the drawing.
- a circular hole 82C having a diameter larger than the outer diameter of the seal rubber 81 is provided at the center, and the seal rubber 81 can be accommodated in the circular hole 82C. Then, it can be fitted onto the space forming portion 66B of the space forming member 66 through the opening 82H on the lower side DW in the drawing.
- three convex fitting protrusions 82D used for fitting with the second internal gasket 83 are provided on two opposing surfaces of the side surface of the first internal gasket 82, respectively.
- the second internal gasket 83 has a rectangular main body portion 83A in a plan view of the lower side DW in the drawing, and side walls 83B that rise from the two side edges of the main body portion 83A to the upper side UW in the drawing.
- the main body 83A has a holding groove 83C that penetrates through a rectangular space into which a first valve body 64A described later can be inserted.
- circular holes 83E and 83F are formed in the center portion of the main body portion 83A through the upper UW and the lower DW, respectively, through the holding groove 83C (see FIG. 5).
- the two side walls 83B are each provided with three fitting holes 83D penetrating the side walls 83B.
- the second internal gasket 83 can be locked to the first internal gasket 82 by fitting the fitting hole 83D to the fitting convex portion 82D of the first internal gasket 82.
- the first internal gasket 82 is fitted on the space forming portion 66B of the space forming member 66, and the caulking portion 66A of the space forming member 66 is interposed between the first internal gasket 82 and the seal rubber 81 accommodated therein.
- the positive electrode through hole 12C of the sealing lid 12, the through hole 80C of the external gasket 80, and the through hole 63C of the positive electrode external terminal member 63 are inserted. Further, the tip portion 66AS of the crimping portion 66A is subjected to laser welding after being expanded in diameter and crimped to the positive external terminal member 63. Thereby, the space forming member 66 is fixed to the sealing lid 12.
- the opening end 66HE of the opening 66H is hermetically sealed by the second valve body 65 by laser welding, and the space forming member 66 and the second valve body 65 A space C is formed.
- the internal space C is evacuated, and the cylindrical hole 66 ⁇ / b> C of the caulking portion 66 ⁇ / b> A of the space forming member 66 is sealed with a sealing plug 67. Further, the sealing plug 67 is laser-welded to the tip portion 66AS of the caulking portion 66A.
- the second valve body 65 has a substantially rectangular plate shape and is made of a vibration-damping iron-aluminum alloy of Fe-8 wt% Al.
- the second valve body 65 has a convex portion 65A projecting downward in the drawing at the center thereof, and a first valve body 64A of a positive electrode internal conduction member 64 described later is connected to the convex portion 65A by welding. ing.
- the first internal gasket 82 is externally fitted to the space forming member 66 from the upper side UW in the drawing as described above.
- a second internal gasket 83 is externally fitted from the lower side DW in the drawing, and a fitting hole 83D of the second internal gasket 83 is fitted to the fitting convex portion 82D of the first internal gasket 82.
- the space forming member 66 and the second valve body 65 are sandwiched between the first internal gasket 83 and the second internal gasket 83, and the second internal gasket 83 is suspended and held by the first internal gasket 82. .
- the positive electrode internal conduction member 64 is a rectangular plate-shaped first valve body 64A located on the upper side UW in the figure, and a positive electrode extending in a downward direction DW in the figure while being bent in a crank shape from one edge 64AE of the first valve body 64A.
- the current collecting member 64B is integrally provided.
- the positive electrode internal conduction member 64 is also made of an integral material of Fe-8 wt% Al damping iron-aluminum alloy. Therefore, the positive electrode internal conducting member 64 and the second valve body 67 are made of the same vibration-damping iron-aluminum alloy. This vibration-damping iron-aluminum alloy has particularly good vibration-damping properties and can be satisfactorily ultrasonically welded to aluminum.
- the positive internal conductive member 64 has its first valve body 64A inserted into the holding groove 83C of the second internal gasket 83 and suspended and held by the second internal gasket 83.
- the circular central portion 64C of the first valve body 64A is thinner than the surroundings, and is connected to the convex portion 65A of the second valve body 65 by laser welding to form a connection portion KG.
- a V-groove-shaped marking portion 64K which is a planned breaking portion scheduled to be broken as described below, is provided in an annular shape on the periphery of the central portion 64C of the first valve body 64A.
- the internal space C formed by the space forming member 66 and the second valve body 65 is evacuated, and the cylindrical hole 66C of the caulking portion 66A of the space forming member 66 is sealed by the sealing plug 67, and then sealed.
- the plug 67 is laser welded to the tip portion 66AS of the caulking portion 66A.
- the pressure type current interrupting mechanism 2 is configured with the first valve body 64A, the second valve body 65, and the space forming member 66 as main constituent members. Moreover, the positive electrode external terminal 61, the current interruption mechanism 2, and the positive electrode internal conduction member 64 are fixed to the sealing lid 12, and form the positive electrode terminal 60.
- the positive electrode internal conduction member 64 is ultrasonically welded to the positive electrode lead portion 21f (positive electrode current collector foil 21s) of the positive electrode plate 21 at the tip end portion 64BS (ultrasonic welding portion) of the positive electrode current collector member 64B.
- the sealing lid 12 of the battery case 10 has a negative electrode through hole 12D.
- the negative electrode external terminal 71 constituted by the bolt 72 and the negative electrode external terminal member 73 is connected to the external gasket 90. It is fixed through.
- the substantially L-shaped external gasket 90 has a bolt holding hole 90H and a through hole 90C that form a hexagonal columnar recess
- the negative external terminal member 73 has two through holes 73B and 73C.
- the bolts 72 a hexagonal columnar head portion 72 ⁇ / b> A is fitted into the bolt holding hole 90 ⁇ / b> H, and the screw portion 72 ⁇ / b> B is inserted through the through hole 73 ⁇ / b> B of the negative electrode external terminal member 73.
- the through hole 73C is coaxially aligned with the negative electrode through hole 12D of the sealing lid 12 together with the through hole 90C of the external gasket 90.
- an annular plate-shaped seal rubber 91, an internal gasket 92 made of resin, and a negative electrode internal conducting member 74 are disposed.
- the negative electrode internal conducting member 74 is bent in a crank shape from a rectangular plate-like base portion 74C, a cylindrical caulking portion 74A extending from the plate-like base portion 74C upward UW in the figure, and one edge 74CE of the plate-like base portion 74C.
- the internal gasket 92 has a rectangular plate shape, and has a circular hole 92C having a diameter larger than the outer diameter of the seal rubber 91 at the center, and the seal rubber 91 can be accommodated in the circular hole 92C.
- the plate-like base portion 74C of the negative electrode internal conducting member 74 is in contact with the internal gasket 92 and the seal rubber 91 accommodated therein, and the crimping portion 74A is connected to the negative electrode through hole 12D of the sealing lid 12 and the external gasket 90 via these.
- the through hole 90C and the through hole 73C of the negative external terminal member 73 are inserted.
- the distal end portion 74AS of the caulking portion 74A is subjected to laser welding after being expanded in diameter and crimped to the negative electrode external terminal member 73. Thereby, the negative electrode internal conduction member 74 is fixed to the sealing lid 12.
- the negative electrode external terminal 71 and the negative electrode internal conduction member 74 are fixed to the sealing lid 12, and form the negative electrode terminal 70 with these.
- the negative electrode internal conducting member 74 is resistance welded to the negative electrode lead portion 22f (negative electrode current collector foil 22s) of the negative electrode plate 22 at the tip 74BS of the negative electrode current collector 74B.
- the battery 1 includes the positive electrode internal conducting member 64, which is an integral member of the positive electrode current collecting member 64B and the first valve body 64A, made of a damping iron-aluminum alloy.
- the positive electrode current collector foil 21s and the positive electrode current collector member 64B are connected by ultrasonic welding. For this reason, at the time of ultrasonic welding of the positive electrode current collector 21s of the positive electrode plate 21 and the positive electrode current collector member 64B, ultrasonic waves transmitted from the tip end portion 64BS (ultrasonic weld portion) of the positive electrode current collector member 64B toward the connecting portion KG. The vibration is absorbed by the positive electrode internal conduction member 64 which is an integral material.
- the battery 1 when the battery 1 is mounted on a hybrid vehicle or an electric vehicle and used for driving a motor, the battery 1 may be used by inverter control. In this case, a minute vibration may occur in the electrode body 20 due to a ripple current flowing through the battery 1. However, in the battery 1, the minute vibration due to the ripple current can also be absorbed by the positive electrode internal conduction member 64. Thereby, the influence on the durability of the electric current interruption mechanism 2 by this micro vibration can also be suppressed. Therefore, also from this point, the battery 1 having high reliability with respect to the current interruption mechanism 2 is obtained.
- the first valve body 64A and the second valve body 65 are made of the same vibration-damping metal, and both are joined by welding to constitute a connecting portion KG.
- welding since welding is performed between the same materials, the reliability of welding is favorable.
- minute vibrations due to ripple current or the like occur when the battery 1 is used, this can be absorbed not only by the positive electrode internal conduction member 64 but also in a path that is transmitted to the second valve body 65. For this reason, the battery 1 having higher reliability with respect to the current interruption mechanism 2 is obtained.
- this battery 1 uses a damping iron-aluminum alloy of Fe-8 wt% Al as a damping metal that forms the positive electrode internal conduction member 64 that is an integral member of the first valve body 64A and the positive current collector 64B. Used.
- This iron-aluminum alloy has particularly good vibration damping properties and can be satisfactorily ultrasonically welded with aluminum.
- the positive electrode internal conducting member 64 which is an integral member of the positive electrode current collecting member 64B made of the iron-aluminum alloy and the first valve body 64A, is appropriately ultrasonically welded to the aluminum foil forming the positive electrode current collecting foil 21s. be able to.
- this battery 1 uses a vibration-damping metal for the positive electrode internal conduction member 64, and the positive current collector member 64B and the positive electrode current collector foil 21s, while having higher reliability with respect to the current interruption mechanism 2.
- the battery 1 is satisfactorily ultrasonically welded.
- a method for manufacturing the battery 1 according to the first embodiment will be described.
- formation of the electrode body 20 will be described.
- a positive electrode paste containing positive electrode active material particles (not shown) made of a lithium composite oxide is applied, leaving the positive electrode lead portion 21f on one side, and thereafter This is dried and pressed to form the positive electrode plate 21.
- a negative electrode paste containing negative electrode active material particles (not shown) made of natural graphite is applied to both sides of a copper foil (negative electrode current collector foil 22s), leaving the negative electrode lead portion 22f on one side, and then dried and pressed.
- the negative electrode plate 22 is formed.
- the positive electrode plate 21 and the negative electrode plate 22 are wound with a separator (not shown) interposed therebetween and compressed into a flat shape to obtain an electrode body 20.
- a positive electrode terminal 60 composed of the positive electrode external terminal 61, the current interruption mechanism 2 and the positive electrode internal conduction member 64 is formed on the sealing lid 12 of the battery case 10, and a negative electrode external terminal 71 and a negative electrode internal conduction member 74 are also constructed.
- the negative electrode terminals 70 to be provided are respectively fixed.
- the head portion 72 ⁇ / b> A of the bolt 72 is inserted into the bolt holding hole 90 ⁇ / b> H of the external gasket 90, and the screw portion 72 ⁇ / b> B is inserted into one through hole 73 ⁇ / b> B of the negative electrode external terminal member 73.
- the other through hole 73C of the negative electrode external terminal member 73 is coaxially aligned with the negative electrode through hole 12D of the sealing lid 12 together with the through hole 90C of the external gasket 90.
- the cylindrical caulking portion 74A of the negative electrode internal conducting member 74 is inserted into the internal gasket 92 and the seal rubber 91, and further, the negative electrode through hole 12D of the sealing lid 12, the through hole 90C of the external gasket 90, and the negative electrode external terminal member. 73 is inserted through the through hole 73C. Further, the distal end portion 74AS of the caulking portion 74A is enlarged in diameter and crimped to the negative external terminal member 73, and then laser welded. As described above, each member constituting the negative electrode terminal 70 is fixed to the sealing lid 12.
- the peripheral edge portion 65E of the second valve body 65 is air-tightly joined to the opening end 66HE of the opening 66H in the space forming portion 66B of the space forming member 66 by laser welding. Further, of the welded space forming member 66 and the second valve body 65, the first internal gasket 82 is externally fitted to the space forming member 66 from the upper side UW in the drawing.
- a second internal gasket 83 is externally fitted to these from the lower side DW in the figure, and the space forming member 66 and the second valve body 65 are sandwiched between the first internal gasket 82 and the second internal gasket 83, and the second internal gasket 83
- the fitting hole 83 ⁇ / b> D of the gasket 83 is fitted into the fitting convex portion 82 ⁇ / b> D of the first internal gasket 82.
- first valve body 64A of the positive electrode internal conduction member 64 is inserted into the holding groove 83C of the second internal gasket 83, and the central portion 64C of the first valve body 64A is formed into the convex portion 65A of the second valve body 65.
- the contact part KG is formed by contacting with laser welding (welding process).
- the head portion 62A of the bolt 62 is inserted into the bolt holding hole 80H of the external gasket 80, and the screw portion 62B is inserted into one through hole 63B of the positive electrode external terminal member 63.
- the other through hole 63C of the positive electrode external terminal member 63 is coaxially aligned with the positive electrode through hole 12C of the sealing lid 12 together with the through hole 80C of the external gasket 80.
- the caulking portion 66A of the space forming member 66 in the structure 60K is inserted into the seal rubber 81, and further the positive electrode through hole 12C of the sealing lid 12, the through hole 80C of the external gasket 80, and the through hole of the positive external terminal member 63. Insert through 63C.
- the tip portion 66AS of the caulking portion 66A is enlarged in diameter and crimped, the positive electrode external terminal member 63 and the tip portion 66AS of the caulking portion 66A are laser welded.
- each member forming the positive electrode terminal 60 is fixed to the sealing lid 12.
- the positive electrode current collecting member 64 ⁇ / b> B of the positive electrode internal conducting member 64 and the negative electrode current collecting member 74 ⁇ / b> B of the negative electrode internal conducting member 74 integrated with the sealing lid 12 are connected to the electrode body 20.
- the negative electrode current collector member 74B made of copper is resistance-welded to the negative electrode lead portion 22f (negative electrode current collector foil 22s) of the negative electrode plate 22.
- the positive electrode current collector member 64B is ultrasonically welded to the positive electrode lead portion 21f (positive electrode current collector foil 21s) of the positive electrode plate 21 (ultrasonic welding process).
- the positive electrode current collector 64B and the positive electrode internal conducting member 64 constituting the first valve body 64A and the second valve body 65 are both made of damping iron-containing Fe-8 wt% Al. It is composed of an aluminum alloy. For this reason, the ultrasonic vibration at the time of ultrasonic welding is absorbed by the second valve body 65 in addition to the positive electrode internal conduction member 64B and the first valve body 64A. Thereby, it can prevent that the connection part KG or the marking part 64K of 64 A of 1st valve bodies and the 2nd valve body 65 breaks by ultrasonic vibration.
- the electrode body 20 is accommodated in the case body member 11, the case body member 11 is sealed with the sealing lid 12, and the sealing lid 12 is laser welded to the case body member 11. Thereafter, the electrolytic solution 30 is injected from the injection hole 12H of the sealing lid 12, and after the injection, the injection hole 12H is sealed. Next, initial charge / discharge of the battery 1 is performed. Thus, the battery 1 is completed.
- the tip 64BS (ultrasonic welding portion) of the positive current collector 64B and the connecting portion KG.
- a part of the gap in the first embodiment, the positive electrode internal conduction member 64 and the second valve body 65, which are an integral member of the positive electrode current collecting member 64B and the first valve body 64A, is made of a damping metal (damping property). (Iron-aluminum alloy).
- the ultrasonic vibration that proceeds from the front end portion 64BS of the positive electrode current collector member 64B toward the connecting portion KG is at least During this period (in the first embodiment, the positive electrode internal conduction member 64), the first valve body 64A and the second valve body 65 are connected to each other at the connecting portion KG or the marking portion 64K by the transmitted ultrasonic vibration.
- the bond can be prevented from breaking. Therefore, it is possible to prevent the current interruption mechanism 2 from operating erroneously during ultrasonic welding, and the battery 1 can be manufactured with a high yield. Further, the influence of the ultrasonic vibration on the connecting portion KG or the marking portion 64K is suppressed, and the current interrupting mechanism 2 has a highly reliable battery 1 with little variation in characteristics.
- an aluminum foil is used for the positive electrode current collector foil 21s of the positive electrode plate 21, and the positive electrode internal conduction member 64 and the first positive electrode current collector member 64B and the first valve body 64A are integrated.
- Damping iron-aluminum alloy is used for the two-valve body 65, and these all contain aluminum which is the same metal element.
- the structure forming step of the manufacturing method of the battery 1 includes a step of welding the first valve body 64A and the second valve body 65 of the positive electrode internal conduction member 64 made of the same damping iron-aluminum alloy. Yes.
- welding since welding is performed between the same materials, the reliability of welding can be improved.
- the ultrasonic vibration can be absorbed by the first valve body 64A (positive electrode internal conduction member 64) but also the second valve through the connecting portion KG from the first valve body 64A (positive electrode internal conduction member 64). Ultrasonic vibration can also be absorbed in the path leading to the valve body 65.
- the first valve body 64A and the second valve body 65 can be reliably coupled by the connecting portion KG, and the first valve body 64A and the second valve body 65 of the current interrupting mechanism 2 can be obtained by ultrasonic vibration during ultrasonic welding. It is possible to further suppress the breakage of the connecting portion KG or the stamped portion 64K and to manufacture the battery 1 with a high yield. Further, the influence on the connecting portion KG or the marking portion 64K due to the ultrasonic vibration can be further suppressed, and the current interrupting mechanism 2 becomes the battery 1 with higher reliability.
- the first valve body 64A and the positive electrode current collecting member 64B (the positive electrode internal conduction member 64) made of an integral material of a damping metal are used.
- the ultrasonic vibration can be absorbed not only by the first valve body 64A but also by the positive electrode current collector 64B. Accordingly, the ultrasonic vibration during ultrasonic welding more reliably suppresses the breakage of the coupling between the first valve body 64A and the second valve body 65 of the current interrupt mechanism 2 at the connecting portion KG or the marking portion 64K.
- the battery 1 can be manufactured with higher yield. Further, the influence on the connecting portion KG or the marking portion 64K due to the ultrasonic vibration can be further suppressed, and the current interrupting mechanism 2 becomes the battery 1 with higher reliability.
- a hybrid vehicle (vehicle) 700 (hereinafter also simply referred to as a vehicle 700) according to the second embodiment is equipped with the battery 1 according to the first embodiment, and the electric energy stored in the battery 1 is used as the drive energy of the drive source. It is used as a whole or a part (see FIG. 6).
- This automobile 700 is a hybrid automobile that is mounted with an assembled battery 710 in which a plurality of batteries 1 are combined and is driven by using an engine 740, a front motor 720, and a rear motor 730 in combination.
- the automobile 700 includes an engine 740, a front motor 720 and a rear motor 730, an assembled battery 710 (battery 1), a cable 750, and an inverter 760 on the vehicle body 790.
- the automobile 700 is configured to be able to drive the front motor 720 and the rear motor 730 using electrical energy stored in the assembled battery 710 (battery 1).
- the assembled battery 710 (battery 1) is used in inverter control by the inverter 760. For this reason, the battery 1 may generate minute vibrations due to a ripple current.
- minute vibration due to the ripple current can be absorbed by the positive electrode internal conduction member 64. Therefore, the battery 1 suppresses the influence on the durability of the current interrupt mechanism 2 due to minute vibrations and has high reliability. Therefore, the reliability of the automobile 700 on which the battery 1 is mounted can be increased.
- a damping iron-aluminum alloy is used as the damping metal, but other damping metals such as M2052 damping alloy, nickel-titanium alloy, etc. may be used.
- the positive current collecting member 64B and the first valve body 64A are formed as an integral material (positive electrode internal conduction member 64), and the same damping iron-aluminum alloy is used together with the second valve body 67.
- at least the first valve body 64A of the positive current collector 64B, the first valve body 64A, and the second valve body 67 may be made of a damping metal.
- the current interrupt mechanism 2 is provided in the positive terminal 60, but may be provided in the negative terminal 70.
- the shape of the battery 1 is a square shape, but a cylindrical battery may be similarly configured, and the battery shape is not limited.
- the electrode body 20 in which the positive electrode plate 21 and the negative electrode plate 22 are wound on each other with a separator interposed therebetween is used.
- the form of the electrode body is not limited to this. For example, it is good also as a laminated type formed by laminating
- the hybrid vehicle 700 is exemplified as a vehicle on which the battery 1 according to the present invention is mounted.
- the present invention is not limited to this.
- Examples of the vehicle on which the battery according to the present invention is mounted include an electric vehicle, a plug-in hybrid vehicle, a hybrid railway vehicle, a forklift, an electric wheelchair, an electrically assisted bicycle, and an electric scooter.
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Abstract
Description
以下、本発明の実施の形態を、図面を参照しつつ説明する。図1に、本実施形態1に係るリチウムイオン二次電池1(以下、単に電池1ともいう)の斜視図を示す。まず、電池1の構成の概略について説明する。なお、以下では、各図面における上方を電池1の上側UW(上方UW)、下方を電池1の下側DW(下方DW)として説明する。この電池1は、正極板21及び負極板22を有する電極体20と、非水系の電解液30と、これら電極体20及び電解液30を気密に収容してなる角型の電池ケース10と、正極板21に接続して電池ケース10外に延出する正極端子60と、負極板22に接続して電池ケース10外に延出する負極端子70とを有する。
次いで、第2の実施の形態について説明する。本実施形態2に係るハイブリッド自動車(車両)700(以下、単に自動車700とも言う)は、実施形態1に係る電池1を搭載し、この電池1に蓄えた電気エネルギーを、駆動源の駆動エネルギーの全部または一部として使用するものである(図6参照)。
2 電流遮断機構
10 電池ケース
11 ケース本体部材
12 封口蓋
20 電極体
21 正極板(電極板)
22 負極板
21s 正極集電箔(集電箔)
22s 負極集電箔
60 正極端子
60K 構造体
64 正極内部導通部材
64A 第1弁体
64B 正極集電部材(集電部材)
64BS (正極集電部材の)先端部(超音波溶接部)
65 第2弁体
67 封栓
KG 連結部
70 負極端子
71 負極外部端子
74 負極内部導通部材
700 ハイブリッド自動車(車両)
710 組電池
Claims (10)
- 集電箔を含む電極板を有する電極体と、
上記電極板の上記集電箔に自身の超音波溶接部で超音波溶接により接続された集電部材と、
上記集電部材に導通接続された圧力型の電流遮断機構とを、電池ケース内に気密に収容してなり、
上記電流遮断機構は、
上記集電部材と一体にされた第1弁体と第2弁体とが連結部で連結され、
上記第1弁体及び上記第2弁体の少なくともいずれかは、上記電池ケースの内圧の上昇により、互いの結合が破断する方向に移動する構成とされてなり、
上記集電部材、上記第1弁体及び上記第2弁体のうち、少なくとも、上記超音波溶接部と上記連結部との間の一部が、制振性金属で構成されてなる
二次電池の製造方法であって、
上記集電部材と一体にされた上記第1弁体と上記第2弁体とを上記連結部で連結した構造体を形成する構造体形成工程と、
上記構造体形成工程の後に、上記電極板の上記集電箔と上記集電部材の上記超音波溶接部とを超音波溶接する超音波溶接工程と、を備える
二次電池の製造方法。 - 請求項1に記載の二次電池の製造方法であって、
前記集電箔、前記集電部材、前記第1弁体、及び前記第2弁体は、いずれも同一の金属元素を含有する金属材料からなり、
前記制振性金属は、上記金属元素及びこれとは異なる異種金属元素との合金である
二次電池の製造方法。 - 請求項1または請求項2に記載の二次電池の製造方法であって、
前記第1弁体及び前記第2弁体は、同一の前記制振性金属からなり、
前記構造体形成工程は、
上記第1弁体と上記第2弁体とを溶接により結合して前記連結部を構成する溶接工程を含む
二次電池の製造方法。 - 請求項1~請求項3のいずれか一項に記載の二次電池の製造方法であって、
前記第1弁体及び前記集電部材は、前記制振性金属の一体材からなる
二次電池の製造方法。 - 集電箔を含む電極板を有する電極体と、
上記電極板の上記集電箔に自身の超音波溶接部で超音波溶接により接続された集電部材と、
上記集電部材に導通接続された圧力型の電流遮断機構とを、電池ケース内に気密に収容してなり、
上記電流遮断機構は、
上記集電部材と一体にされた第1弁体と第2弁体とが連結部で連結され、
上記第1弁体及び上記第2弁体の少なくともいずれかは、上記電池ケースの内圧の上昇により、互いの結合が破断する方向に移動する構成とされてなり、
上記集電部材、上記第1弁体及び上記第2弁体のうち、少なくとも、上記超音波溶接部と上記連結部との間の一部が、制振性金属で構成されてなる
二次電池。 - 請求項5に記載の二次電池であって、
前記集電箔、前記集電部材、前記第1弁体、及び前記第2弁体は、いずれも同一の金属元素を含有する金属材料からなり、
前記制振性金属は、上記金属元素及びこれとは異なる異種金属元素との合金である
二次電池。 - 請求項5または請求項6に記載の二次電池であって、
前記第1弁体及び前記第2弁体は、同一の前記制振性金属からなり、溶接により結合して前記連結部を構成してなる
二次電池。 - 請求項5~請求項7のいずれか一項に記載の二次電池であって、
前記第1弁体及び前記集電部材は、前記制振性金属の一体材からなる
二次電池。 - 請求項8に記載の二次電池であって、
前記集電箔は、アルミニウム箔であり、
前記制振性金属は、制振性鉄-アルミニウム合金である
二次電池。 - 請求項9に記載の二次電池であって、
前記制振性鉄-アルミニウム合金は、アルミニウムを6~10重量%含有し、残部が鉄及び不可避不純物からなる
二次電池。
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KR1020147013469A KR20140079500A (ko) | 2011-11-23 | 2011-11-23 | 2차 전지의 제조 방법 및 2차 전지 |
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DE112011105871T5 (de) | 2014-08-07 |
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