WO2011114421A1 - 電池及びその製造方法 - Google Patents
電池及びその製造方法 Download PDFInfo
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- WO2011114421A1 WO2011114421A1 PCT/JP2010/054332 JP2010054332W WO2011114421A1 WO 2011114421 A1 WO2011114421 A1 WO 2011114421A1 JP 2010054332 W JP2010054332 W JP 2010054332W WO 2011114421 A1 WO2011114421 A1 WO 2011114421A1
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- WIPO (PCT)
- Prior art keywords
- current collector
- electrode current
- negative electrode
- positive electrode
- battery
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0583—Construction or manufacture of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or 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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat 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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
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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
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49108—Electric battery cell making
Definitions
- the present invention relates to a battery and a manufacturing method thereof, and more particularly, to a battery including two or more current collectors connected to each other and a manufacturing method thereof.
- Lithium ion secondary batteries are characterized by higher energy density than other secondary batteries and capable of operating at high voltages. For this reason, it is used as a secondary battery that can be easily reduced in size and weight in information equipment such as a mobile phone, and in recent years, there is an increasing demand for large motive power such as for electric vehicles and hybrid vehicles.
- Patent Document 1 discloses that a positive electrode having a positive electrode lead portion at one end portion in the short direction of the positive electrode substrate and a negative electrode lead portion at one end portion in the short direction of the negative electrode substrate.
- a battery element having a negative electrode and a solid electrolyte layer interposed between the positive electrode and the negative electrode, wherein the positive electrode lead portion and the negative electrode lead portion are electrically connected to the outside over the entire length of each electrode.
- a battery is disclosed.
- a battery element is wound or folded in the longitudinal direction of the positive electrode substrate and the negative electrode substrate, or one battery element is provided after the positive electrode lead portion and the negative electrode lead portion are laminated and integrated.
- Patent Document 2 discloses a first forming step for forming a cell including an electrode in which a positive electrode and a negative electrode having a flat plate shape are stacked via a separator, and a cell formed by the first forming step.
- a method for manufacturing a secondary battery is disclosed.
- an object of the present invention is to provide a battery capable of reducing electrical resistance between power generation elements and a method for manufacturing the same.
- a first aspect of the present invention is a positive electrode layer, a negative electrode layer, an electrolyte layer disposed between the positive electrode layer and the negative electrode layer, a positive electrode current collector connected to the positive electrode layer, and a negative electrode layer
- a plurality of power generation elements each having a negative electrode current collector, wherein the plurality of power generation elements are wound or folded, and a positive current collector included in one power generation element and another power generation adjacent to the one power generation element
- the negative electrode current collector included in the element is connected directly or indirectly across the entire length of the positive electrode current collector and the negative electrode current collector before and after the power generation element is wound or folded. It is a battery characterized by this.
- the bent positive electrode current collector and the bent negative electrode current collector may be fitted together to connect the positive electrode current collector and the negative electrode current collector.
- the bent positive electrode current collector and the bent negative electrode current collector are fitted together to connect the positive electrode current collector and the negative electrode current collector, the connected positive electrode current collector It is preferable that the electric body and the negative electrode current collector are fixed via a fixing member.
- the positive electrode current collector and the negative electrode current collector may be connected via a conductor in contact with the positive electrode current collector and the negative electrode current collector.
- the bent positive electrode current collector and the bent conductor are fitted together
- the bent conductor and the bent negative electrode current collector may be fitted together.
- a positive electrode layer, a negative electrode layer, an electrolyte layer disposed between the positive electrode layer and the negative electrode layer, a positive electrode current collector connected to the positive electrode layer, and a negative electrode layer are connected.
- a power generation element manufacturing process for manufacturing a plurality of power generation elements including a negative electrode current collector, a positive electrode current collector included in one power generation element manufactured in the power generation element manufacturing process, and a power generation element manufacturing process
- the connecting step connects the positive electrode current collector and the negative electrode current collector by fitting the bent positive electrode current collector with the bent negative electrode current collector. It may be.
- the second aspect of the present invention further comprising a connecting step of connecting the positive electrode current collector and the negative electrode current collector by fitting the bent positive electrode current collector and the bent negative electrode current collector. It is preferable to have a fixing step of fixing the connected positive electrode current collector and negative electrode current collector using a fixing member after the winding and folding step.
- the “bent positive electrode current collector” and the “bent negative electrode current collector” may be a positive electrode current collector or a negative electrode current collector bent in the connection step. It may be a positive electrode current collector or a negative electrode current collector that is bent in advance before the connection step.
- the connecting step may be a step of connecting the positive electrode current collector and the negative electrode current collector through a conductor that contacts the positive electrode current collector and the negative electrode current collector. good.
- connection step in which the positive electrode current collector and the negative electrode current collector are connected via a conductor
- the connection step is bent with the bent positive electrode current collector.
- the “bent conductor” may be a conductor bent in the connecting step, or may be a conductor bent in advance before the connecting step. .
- the bent positive electrode current collector and the bent negative electrode current collector are fitted together, and the positive electrode current collector and the negative electrode current collector are connected.
- the thickness of the connecting portion connecting the electric body and the negative electrode current collector can be made thicker than before. Therefore, by setting it as such a form, even if it is a case where an electrical power collector is integrated, damage and a fracture
- the bent positive electrode current collector and the bent negative electrode current collector are fitted together to connect the positive electrode current collector and the negative electrode current collector, the connected positive electrode current collector Since the electric body and the negative electrode current collector are fixed via the fixing member, it is easy to reduce the electric resistance between the power generation elements.
- the positive electrode current collector and the negative electrode current collector are connected to each other through a conductor in contact with the positive electrode current collector and the negative electrode current collector.
- a positive electrode current collector included in one power generation element and a negative electrode current collector included in another power generation element adjacent to the one power generation element are combined into a positive electrode current collector and a negative electrode current collector. After connecting over the entire length of the electric body, the power generation element is wound or folded. Therefore, in the second aspect of the present invention, the battery according to the first aspect of the present invention can be manufactured. Therefore, according to the 2nd aspect of this invention, the manufacturing method of a battery which can manufacture the battery which can reduce the electrical resistance between electric power generation elements can be provided.
- a positive electrode current collector is obtained by fitting a bent positive electrode current collector and a bent negative electrode current collector and connecting the positive electrode current collector and the negative electrode current collector.
- the negative electrode current collector can be made thicker than before. Therefore, by setting it as such a form, even if it is a case where a current collector is integrated after winding or folding a power generation element, damage and a fracture
- the power generating element is wound or folded by connecting the positive electrode current collector and the negative electrode current collector via a conductor in contact with the positive electrode current collector and the negative electrode current collector. There is no need to integrate the current collector later. Therefore, by setting it as this form, damage and a fracture
- FIG. 5 is a cross-sectional view illustrating a structure body 7.
- FIG. It is a figure explaining the winding body.
- It is a figure explaining the conventional battery which has an integrated electrical power collector.
- 4 is a flowchart for explaining a manufacturing process of the battery 10.
- 3 is a cross-sectional view illustrating a structure 26.
- FIG. It is a figure explaining the winding body 27.
- FIG. 4 is a flowchart for explaining a manufacturing process of the battery 20.
- 3 is a cross-sectional view illustrating a structure 36.
- FIG. It is a figure explaining the winding body 37.
- FIG. 4 is a flowchart illustrating a manufacturing process of battery 30.
- FIG. 1 is a cross-sectional view of a structure 7 having power generation elements 6, 6,... Before being wound, where two sets of positive current collectors 4, 4 and negative current collectors 5, 5 are connected. And only the surroundings are extracted and shown.
- 1 is the short direction of the positive electrode current collector 4 and the negative electrode current collector 5, and the back / front direction of FIG. 1 is the long direction of the positive electrode current collector 4 and the negative electrode current collector 5.
- . 2 is a front view for explaining the wound body 9 after winding the power generating elements 6, 6,... And the vicinity of a place where a set of fixing members 11, 11,. Only extracted and shown.
- the left-right direction in FIG. 2 is the short direction of the positive electrode current collector 4 and the negative electrode current collector 5.
- the structure 7 and the wound body 9 include a positive electrode layer 1, a negative electrode layer 2, an electrolyte layer 3 disposed between the positive electrode layer 1 and the negative electrode layer 2, and a positive electrode layer 1.
- a plurality of power generating elements 6, 6... Each including a positive electrode current collector 4 connected to the negative electrode current collector 5 and a negative electrode current collector 5 connected to the negative electrode layer 2.
- the positive electrode layers 1 and 1 are disposed on the front and back surfaces of the positive electrode current collector 4, the negative electrode layers 2 and 2 are disposed on the front and back surfaces of the negative electrode current collector 5, and the electrolyte layer 3 includes a pair of positive electrode layers 1 and It is disposed between the negative electrode layers 2.
- connection part 8 which has the positive electrode collector 4 and the negative electrode collector 5 connected over the whole area of the elongate direction is comprised by being fitted over.
- the wound body 9 is made into the battery 10 of the present invention by being accommodated in an exterior material (not shown).
- FIG. 3 is a cross-sectional view illustrating the form of a battery according to a reference example.
- FIG. 3 shows a state of the structure 95 having the power generation elements 93, 93,... Before being wound, and the positive electrode current collectors 91 and 91 and the negative electrode current collector integrated using the connection terminals 94. Only the bodies 92 and 92 and their surroundings are extracted and shown. 3 is the short direction of the positive electrode current collector 91 and the negative electrode current collector 92, and the back / front direction of the paper surface of FIG. 3 is the long direction of the positive electrode current collector 91 and the negative electrode current collector 92. .
- a conventional battery is manufactured by housing a wound body formed by winding the structure 95 in the back / front direction of FIG. 3 in an exterior material (not shown). 3, components similar to those of the battery 10 are denoted by the same reference numerals as those used in FIGS. 1 and 2, and the description thereof is omitted as appropriate.
- the structure 95 includes a positive electrode layer 1, a negative electrode layer 2, an electrolyte layer 3 disposed between the positive electrode layer 1 and the negative electrode layer 2, and a positive electrode current collector connected to the positive electrode layer 1. , And a plurality of power generation elements 93, 93,... Each including a negative electrode current collector 92 connected to the negative electrode layer 2.
- the positive electrode layers 1 and 1 are disposed on the front and back surfaces of the positive electrode current collector 91
- the negative electrode layers 2 and 2 are disposed on the front and back surfaces of the negative electrode current collector 92
- the electrolyte layer 3 includes the pair of positive electrode layers 1 and It is disposed between the negative electrode layers 2.
- both ends in the short direction of the positive electrode current collector 91 and the negative electrode current collector 92 are not bent.
- a plurality of positive electrode current collectors 91, 91,... And negative electrode current collectors 92, 92,... To be connected are collected in one place, and then fixed using a connection terminal 94.
- the plurality of positive electrode current collectors 91, 91,... And the negative electrode current collectors 92, 92 are collected in one place, and then fixed using a connection terminal 94.
- the plurality of positive electrode current collectors 91, 91,... And the negative electrode current collectors 92, 92 As shown in FIG. 3, in the conventional battery, the difference between the thicknesses of the positive electrode current collectors 91, 91,... And the negative electrode current collectors 92, 92,. . Therefore, the positive electrode current collectors 91, 91,...
- the negative electrode current collectors 92, 92,... (For example, as shown in FIG.
- the positive electrode current collector 91 and the negative electrode current collector 92) disposed on the upper side of the paper were pulled greatly when collected at one place, and were easily damaged or broken.
- the electric resistance between the power generation elements 93 and 93 electrically connected via the positive electrode current collector 91 and the negative electrode current collector 92 is likely to increase. Therefore, the conventional battery has a problem that it is difficult to reduce the electric resistance.
- the battery 10 includes positive current collectors 4, 4,... And negative current collectors 5, 5,.
- the thickness of the connection portions 8, 8, By providing such a positive electrode current collector 4, 4,... And a negative electrode current collector 5, 5,..., The thickness of the connection portions 8, 8,.
- the difference between the thickness of the positive electrode current collector 91 and the negative electrode current collector 92 and the thickness of the power generation element 93 (hereinafter referred to as “reference example”). It can be reduced more than “difference”). More specifically, for example, when the positive electrode current collector 4 and the negative electrode current collector 5 have the same thickness, the thickness of the connecting portions 8, 8,... Is the thickness of the positive electrode current collector 4 or the negative electrode current collector 5. Therefore, according to the battery 10, the difference in thickness can be reduced more than the difference in the reference example.
- the positive electrode current collector 4 disposed at a position away from the place where the plurality of connecting sections 8, 8,. ,... And the tension applied to the negative electrode current collectors 5, 5,... Can be reduced, so that the positive electrode current collectors 4, 4,. Breakage / breakage of ... can be suppressed.
- the power generation elements that are electrically connected via the connection portions 8, 8,... By suppressing the breakage / breakage of the positive electrode current collectors 4, 4,. Since it becomes possible to reduce the electrical resistance between 6, 6,..., The battery 10 capable of reducing the electrical resistance can be provided according to the present invention.
- a plurality of connecting portions 8, 8,... are integrated and fixed using fixing means 11, 11,.
- fixing means 11, 11 By adopting such a form, it becomes easy to firmly adhere the positive electrode current collectors 4, 4,... And the negative electrode current collectors 5, 5,. Become.
- the positive electrode layers 1 and 1 disposed on the front and back surfaces of the positive electrode current collector 4 are, for example, a positive electrode material and a solid electrolyte (for example, a sulfide solid electrolyte such as Li 3 PS 4 , Li 3 PO 4). Etc.) After applying the mixture prepared by mixing the oxide solid electrolyte such as polyethylene oxide (PEO) and the like to the surface and the back surface of the positive electrode current collector 4, the mixture is applied at room temperature for 10 seconds. It can be produced by pressing at a pressure of 100 MPa.
- the positive electrode material contained in the positive electrode layer 1 include lithium transition metal oxides and chalcogenides.
- lithium transition metal oxide contained in the positive electrode layer 1 examples include lithium cobaltate (LiCoO 2 ), lithium nickelate (LiNiO 2 ), lithium manganate (LiMnO 2 ), iron olivine (LiFePO 4 ), and cobalt olivine (LiCoPO 4 ). ), Manganese olivine (LiMnPO 4 ), lithium titanate (Li 4 Ti 5 O 12 ), and the like.
- chalcogenides to be contained in the positive electrode layer 1 include copper subrel (Cu 2 Mo 6 S 8 ), iron sulfide (FeS), cobalt sulfide (CoS), and nickel sulfide (NiS). Can do.
- the thickness of the positive electrode layer 1 can be set to, for example, 50 ⁇ m.
- the negative electrode layers 2 and 2 disposed on the front and back surfaces of the negative electrode current collector 5 are, for example, a negative electrode material and a solid electrolyte (for example, a sulfide solid electrolyte such as Li 3 PS 4 , Li 3
- a mixed material prepared by mixing an oxide solid electrolyte such as PO 4 and a polymer electrolyte such as polyethylene oxide (PEO) to the front and back surfaces of the negative electrode current collector 5, the mixture is applied at room temperature for 10 seconds. It can be produced by pressing at a pressure of 100 MPa.
- the negative electrode material contained in the negative electrode layer 2 include carbon, lithium transition metal oxides, and alloys.
- lithium transition metal oxide to be contained in the negative electrode layer 2 examples include lithium titanate (Li 4 Ti 5 O 12 ).
- La 3 Ni 2 Sn 7 can be exemplified as an alloy to be contained in the negative electrode layer 2.
- the thickness of the negative electrode layer 2 can be set to 60 ⁇ m, for example.
- the form of the electrolyte layer 3 disposed between the pair of the positive electrode layer 1 and the negative electrode layer 2 is not particularly limited.
- An electrolyte layer containing a known gel electrolyte can be obtained.
- the electrolyte layer 3 is a solid electrolyte layer
- the electrolyte layer 3 can be produced, for example, by pressing a sulfide solid electrolyte such as Li 3 PS 4 at a pressure of 100 MPa for 10 seconds.
- the thickness of the electrolyte layer 3 can be set to 20 ⁇ m, for example.
- the positive electrode current collector 4 only needs to be made of a conductive material that can withstand the environment in which the battery 10 is used.
- the positive electrode current collector 4 can be made of an aluminum foil having a thickness of several ⁇ m to several tens of ⁇ m. it can.
- the negative electrode current collector 5 only needs to be made of a conductive material that can withstand the environment in which the battery 10 is used, and can be made of a copper foil having a thickness of several ⁇ m to several tens of ⁇ m.
- the fixing member 11 can withstand the use environment of the battery 10 and can integrally fix the plurality of connection portions 8, 8,.
- the form is not particularly limited. A known rivet or the like can be used as the fixing member 11 as appropriate.
- the battery 10 including the fixing members 11, 11,... Has been described.
- the battery of the present invention having a plurality of connection portions 8, 8,... Is limited to a form in which the fixing members are provided. is not.
- the battery preferably includes a fixing member that integrally fixes a plurality of connection portions.
- FIG. 4 is a flowchart for explaining the manufacturing process of the battery 10.
- a method for manufacturing the battery 10 (one embodiment of a method for manufacturing a battery according to the present invention) will be described with reference to FIGS. 1, 2, and 4.
- the battery 10 is manufactured through a power generation element production step (S11), a connection step (S12), a wound folding step (S13), and a fixing step (S14).
- the power generation element manufacturing step (hereinafter referred to as “S11”) is a step of manufacturing the power generation elements 6, 6,.
- the form of S11 is not particularly limited as long as the power generation elements 6, 6,.
- S11 for example, a mixed material prepared by mixing a positive electrode material and a solid electrolyte is applied to the front and back surfaces of the positive electrode current collector 4 whose one end in the short direction is bent, and then at room temperature for 10 seconds. By pressing at a pressure of 100 MPa, a positive electrode structure in which positive electrode layers 1 and 1 having a thickness of 50 ⁇ m are disposed on the front and back surfaces of the positive electrode current collector 4 can be produced.
- the mixture is applied for 10 seconds at room temperature.
- a negative electrode structure in which negative electrode layers 2 and 2 each having a thickness of 60 ⁇ m are disposed on the front and back surfaces of the negative electrode current collector 5 can be produced.
- an electrolyte layer 3 having a thickness of 20 ⁇ m can be manufactured by pressing a sulfide solid electrolyte such as Li 3 PS 4 at a pressure of 100 MPa for 10 seconds.
- the positive electrode structure, the negative electrode structure, and the electrolyte layer 3 are produced, the positive electrode structure, the electrolyte layer 3, and the electrolyte layer 3 are disposed between the pair of the positive electrode layer 1 and the negative electrode layer 2. And the electric power generation element 6 is producible by laminating
- the connecting step (hereinafter referred to as “S12”) is included in the positive electrode current collector 4 included in the power generation element 6 manufactured in S11 and the power generation element 6 adjacent thereto in the left-right direction in FIG.
- the structure 7 shown in FIG. 1 is manufactured through a process of connecting the negative electrode current collector 5 over the entire area in the longitudinal direction of the positive electrode current collector 4 and the negative electrode current collector 5 to form the connection portion 8. It is a process to do.
- the form of S12 is not particularly limited as long as the structure 7 having a plurality of connection portions 8, 8,. In S12, for example, one end in the short direction of the positive electrode current collector 4 bent over the entire length in the long direction and one end in the short direction of the negative electrode current collector 5 bent over the entire length in the long direction.
- the connecting portion 8 can be formed by fitting together.
- the winding / folding step (hereinafter referred to as “S13”) is performed by winding the structure 7 produced in S12 in the longitudinal direction of the positive electrode current collector 4 and the negative electrode current collector 5. This is a step of producing a revolving body.
- S14 a plurality of connection portions 8, 8,... Provided in the wound body produced in S13 are integrated using the fixing members 11, 11,.
- S14 can produce the winding body 9, the form will not be specifically limited.
- the fixing members 11, 11,... are inserted into the holes, and the inserted fixing members 11, 11 are inserted. ,... Can be formed by deforming the tip of the winding body 9.
- the wound body 9 can be manufactured through S11 to S14.
- the battery 10 can be manufactured by passing the process of accommodating the winding body 9 in an exterior material, and sealing the exterior material in which the winding body 9 was accommodated. Therefore, according to this invention, the manufacturing method of a battery which can manufacture the battery 10 which can reduce the electrical resistance between the electric power generation elements 6 and 6 can be provided.
- connection portions 8, 8 formed by directly connecting the positive electrode current collectors 4, 4,... And the negative electrode current collectors 5, 5,.
- the present invention is not limited to this form. Therefore, the present invention according to another embodiment will be described below.
- FIG. 5 and 6 are diagrams for explaining the battery 20 of the present invention according to the second embodiment.
- FIG. 5 corresponds to FIG.
- FIG. 5 is a cross-sectional view showing the structure 26 having the power generation elements 23, 23,... Before being wound, and the connection between the two sets of the positive electrode current collectors 21, 21 and the negative electrode current collectors 22, 22. Only the part and its periphery are extracted and shown.
- 5 is the short direction of the positive electrode current collector 21 and the negative electrode current collector 22, and the back / front direction of FIG. 5 is the long direction of the positive electrode current collector 21 and the negative electrode current collector 22.
- . 6 is a front view for explaining the wound body 27 after winding the power generation elements 23, 23,..., And shows only the connecting portion 25 and its periphery.
- the structure 26 and the wound body 27 include the positive electrode layer 1, the negative electrode layer 2, the electrolyte layer 3 disposed between the positive electrode layer 1 and the negative electrode layer 2, and the positive electrode layer 1.
- the positive electrode layer 1 are provided with a plurality of power generating elements 23, 23,... Each including a positive electrode current collector 21 connected to the negative electrode layer 2 and a negative electrode current collector 22 connected to the negative electrode layer 2.
- the positive electrode layers 1 and 1 are disposed on the front and back surfaces of the positive electrode current collector 21, the negative electrode layers 2 and 2 are disposed on the front and back surfaces of the negative electrode current collector 22, and the electrolyte layer 3 includes a pair of positive electrode layers 1 and It is disposed between the negative electrode layers 2.
- the conductor 24 is in contact with the entire length in the long direction at one end in the short direction of the positive electrode current collector 21 and the entire length in the long direction at one end in the short direction of the negative electrode current collector 22.
- the connection part 25 is comprised by joining the conductor 24 and the positive electrode current collector 21, and the conductor 24 and the negative electrode current collector 22.
- the structure 26 having a plurality of connecting portions 25, 25,... Is wound into a wound body 27 by being wound in the back / front direction of FIG. 5, and the wound body 27 is accommodated in an exterior material.
- the positive electrode current collector 21 and the negative electrode current collector 22 are integrated via the conductor 24 at the stage of the structure 26, the positive electrode current collector 21 is formed after forming the wound body 27. , 21, and the negative electrode current collectors 22, 22,. That is, by adopting such a configuration, it is possible to prevent the current collector from being damaged or broken when the current collector is integrated. Therefore, according to the present invention, the battery 20 capable of reducing the electrical resistance. Can be provided.
- the positive electrode current collector 21 can be made of the same material as that of the positive electrode current collector 4, and the thickness of the positive electrode current collector 21 can be, for example, several ⁇ m to several tens ⁇ m.
- the negative electrode current collector 22 can be made of the same material as the negative electrode current collector 5, and the thickness of the negative electrode current collector 22 can be set to several ⁇ m to several tens ⁇ m, for example.
- the conductor 24 is made of a known conductive material that can withstand the use environment of the battery 20 and can be joined to the positive electrode current collector 21 and the negative electrode current collector 22. Can do.
- the conductive material 24 may be a clad material or the like that is formed by metallicly bonding aluminum and copper. it can.
- the form of the connecting portion 25 is particularly limited as long as the positive electrode current collector 21 and the negative electrode current collector 22 are connected to the entire lengthwise direction via the conductor 24. It is not something.
- the connecting portion 25 is formed by welding at least a part of the longitudinal direction at one end in the short direction of the positive electrode current collector 21 and the conductor 24, and at least in the long direction at one end in the short direction of the negative electrode current collector 22. A part and the conductor 24 may be welded.
- FIG. 7 is a flowchart for explaining the manufacturing process of the battery 20.
- a method for manufacturing the battery 20 (one embodiment of a method for manufacturing a battery according to the present invention) will be described with reference to FIGS.
- the battery 20 is manufactured through a power generation element manufacturing step (S21), a connection step (S22), and a wound folding step (S23).
- the power generation element production step (hereinafter referred to as “S21”) is a step of producing the power generation elements 23, 23,.
- the form of S21 is not particularly limited as long as the power generation elements 23, 23,.
- the positive electrode structure can be manufactured by disposing the positive electrode layers 1 and 1 each having a thickness of 50 ⁇ m on the front surface and the back surface of the positive electrode current collector 21 by the same method as in S11.
- the negative electrode structure can be manufactured by disposing the negative electrode layers 2 and 2 each having a thickness of 60 ⁇ m on the front surface and the back surface of the negative electrode current collector 22 by the same method as in S11.
- the electrolyte layer 3 having a thickness of 20 ⁇ m can be manufactured by the same method as in S11.
- the positive electrode structure, the negative electrode structure, and the electrolyte layer 3 are produced, the positive electrode structure, the electrolyte layer 3, and the electrolyte layer 3 are disposed between the pair of the positive electrode layer 1 and the negative electrode layer 2.
- the electric power generation element 23 is producible by laminating
- connection step (hereinafter referred to as “S22”) is included in the positive electrode current collector 21 included in the power generation element 23 manufactured in S21 and the power generation element 23 adjacent thereto in the horizontal direction in FIG.
- the negative electrode current collector 22 is connected using a conductive material 24 to form a connection portion 25, and the structure 26 shown in FIG.
- the form of S22 is not particularly limited as long as the structure 26 having a plurality of connection portions 25, 25,.
- S ⁇ b> 22 for example, at least a part in the longitudinal direction at one end in the short direction of the positive electrode current collector 21 and the conductor 24 are welded, and at least a part in the long direction at one end in the short direction of the negative electrode current collector 22.
- the connecting portion 25 can be formed by welding the conductor 24 and the conductor 24.
- the winding / folding step (hereinafter referred to as “S23”) is performed by winding the structure 26 manufactured in S22 in the longitudinal direction of the positive electrode current collector 21 and the negative electrode current collector 22. This is a process for producing the rotating body 27.
- the wound body 27 can be manufactured through S21 to S23.
- the battery 20 can be manufactured through a process of accommodating the wound body 27 in an exterior material and sealing the exterior material in which the wound body 27 is accommodated. Therefore, according to this invention, the manufacturing method of a battery which can manufacture the battery 20 which can reduce the electrical resistance between the electric power generation elements 23 and 23 can be provided.
- FIG. 8 and 9 are diagrams for explaining the battery 30 of the present invention according to the third embodiment.
- FIG. 8 corresponds to FIG.
- FIG. 8 is a cross-sectional view showing the structure 36 having the power generation elements 33, 33,... Before being wound, and the connection between the two sets of the positive electrode current collectors 31, 31 and the negative electrode current collectors 32, 32. Only the part and its periphery are extracted and shown. 8 is the short direction of the positive electrode current collector 31 and the negative electrode current collector 32, and the back / front direction of the paper surface of FIG. 8 is the long direction of the positive electrode current collector 31 and the negative electrode current collector 32. .
- FIG. 9 is a front view for explaining the wound body 37 after winding the power generation elements 33, 33,..., And shows only the connecting portion 35 and its periphery.
- the horizontal direction in FIG. 9 is the short direction of the positive electrode current collector 31, the negative electrode current collector 32, and the conductor 34. 8 and 9, the same components as those of the battery 20 are denoted by the same reference numerals as those used in FIGS. 5 and 6, and the description thereof is omitted as appropriate.
- the structure 36 and the wound body 37 include the positive electrode layer 1, the negative electrode layer 2, the electrolyte layer 3 disposed between the positive electrode layer 1 and the negative electrode layer 2, and the positive electrode layer 1. And a plurality of power generating elements 33, 33,... Each including a positive electrode current collector 31 connected to the negative electrode current collector 32 and a negative electrode current collector 32 connected to the negative electrode layer 2.
- the positive electrode layers 1 and 1 are disposed on the front and back surfaces of the positive electrode current collector 31, the negative electrode layers 2 and 2 are disposed on the front and back surfaces of the negative electrode current collector 32, respectively, and the electrolyte layer 3 includes a pair of positive electrode layers 1 and It is disposed between the negative electrode layers 2.
- the positive electrode current collectors 31, 31,... And the negative electrode current collectors 32, 32,... are bent at one end in the short direction over the entire length in the long direction. Both ends in the short length direction are bent over the entire length in the long length direction.
- the bent side of the positive electrode current collector 31 and the one end side in the short direction of the conductor 34 are fitted together, and the bent side of the negative electrode current collector 32 and the other end side in the short direction of the conductor 34 are fitted.
- the connecting portion 35 is configured.
- the battery 30 of the present invention is obtained.
- the positive electrode current collector 31 and the negative electrode current collector 32 are integrated via the conductor 34 at the stage of the structure 36, the positive electrode current collector 31 is formed after the winding body 37 is formed. , 31, ... and the negative electrode current collectors 32, 32, ... need not be integrated. That is, even in such a form, the current collector can be prevented from being damaged or broken when the current collector is integrated. Therefore, according to the present invention, the battery 30 capable of reducing the electrical resistance is provided. Can be provided.
- the positive electrode current collector 31 can be made of the same material as that of the positive electrode current collector 4, and the thickness of the positive electrode current collector 31 can be, for example, several ⁇ m to several tens ⁇ m.
- the negative electrode current collector 32 can be made of the same material as that of the negative electrode current collector 5, and the thickness of the negative electrode current collector 32 can be, for example, several ⁇ m to several tens ⁇ m.
- the conductor 34 can be made of the same material as the conductor 24.
- the conductive material 34 is made of a clad material or the like that is formed by metallicly bonding aluminum and copper. it can.
- connection part 35 has a configuration in which the positive electrode current collector 31 and the negative electrode current collector 32 are connected through the conductor 34 over the entire area in the longitudinal direction. It is not limited. For example, at least a part of the fitted positive electrode current collector 31 and the conductor 34 in the longitudinal direction is welded and the fitted negative electrode current collector 32 and the conductor 34 in the longitudinal direction are connected to the connecting portion 35. At least a part thereof may be welded.
- FIG. 10 is a flowchart for explaining the manufacturing process of the battery 30.
- a method for manufacturing the battery 30 (one embodiment of a method for manufacturing a battery according to the present invention) will be described with reference to FIGS.
- the battery 30 is manufactured through a power generation element manufacturing step (S31), a connection step (S32), and a wound folding step (S33).
- the power generation element production step (hereinafter referred to as “S31”) is a step of producing the power generation elements 33, 33,.
- the form of S31 is not particularly limited as long as the power generation elements 33, 33,.
- the positive electrode structure can be manufactured by disposing the positive electrode layers 1 and 1 each having a thickness of 50 ⁇ m on the front surface and the back surface of the positive electrode current collector 31 by the same method as in S11.
- the negative electrode structure can be manufactured by disposing the negative electrode layers 2 and 2 each having a thickness of 60 ⁇ m on the front and back surfaces of the negative electrode current collector 32 by the same method as in S11.
- the electrolyte layer 3 having a thickness of 20 ⁇ m can be manufactured by the same method as in S11.
- the positive electrode structure, the negative electrode structure, and the electrolyte layer 3 are produced, the positive electrode structure, the electrolyte layer 3, and the electrolyte layer 3 are disposed between the pair of the positive electrode layer 1 and the negative electrode layer 2.
- the electric power generation element 33 is producible by laminating
- the connecting step (hereinafter referred to as “S32”) is included in the positive electrode current collector 31 included in the power generation element 33 manufactured in S31 and the power generation element 33 adjacent thereto in the left-right direction in FIG.
- the negative electrode current collector 32 is connected using a conductive material 34 to form a connection portion 35, and the structure 36 shown in FIG.
- the form of S32 is not particularly limited as long as the structure 36 having a plurality of connection portions 35, 35,.
- the connection portion 35 can be formed by fitting the other end in the short direction of the conductor 34 and then welding them.
- the structure 36 produced in S32 is wound in the longitudinal direction of the positive electrode current collector 31 and the negative electrode current collector 32, whereby This is a process for producing the rotating body 37.
- the wound body 37 can be manufactured through S31 to S33.
- the battery 30 can be manufactured by passing the process of accommodating the winding body 37 in an exterior material, and sealing the exterior material in which the winding body 37 was accommodated. Therefore, according to this invention, the manufacturing method of a battery which can manufacture the battery 30 which can reduce the electrical resistance between the electric power generation elements 33 and 33 can be provided.
- the battery of the present invention may be configured to include a plurality of folded power generation elements, and the battery manufacturing method of the present invention includes a wound folding process of folding a plurality of power generation elements. Also good.
- the present invention may be a battery in a form in which sodium ions and magnesium ions move and a method for manufacturing the same. it can.
- the distance from one end in the short direction of the positive electrode current collector connected to the negative electrode current collector to the end surface of the positive electrode layer formed on the front and back surfaces of the positive electrode current collector, and the negative electrode current collector connected to the positive electrode current collector is 15 mm, and an electrolyte layer is disposed between the positive electrode layer and the negative electrode layer.
- the winding body 9, the structures 26 and 36, and the structure 95 were manufactured through the process of laminating a plurality of power generation elements to a thickness of 10 mm. Then, the current collector (positive electrode current collector and negative electrode current collector) is examined for damage or breakage, and the electrical resistance between the connected positive electrode current collector and negative electrode current collector (between power generation elements) is measured. did.
- the positive electrode current collector disposed at the position farthest from the place where the plurality of current collectors are collected at one place, and the positive electrode current collector is disposed adjacent to the positive electrode current collector.
- the positive electrode current collector that had been damaged was broken (partially broken).
- the electrical resistance between the power generation elements in the wound body 9 was 0.8 m ⁇
- the electrical resistance between the power generation elements in the structure 26 was 1.1 m ⁇
- the electrical resistance between the power generation elements in the structure 36 was 0.9 m ⁇ .
- the electrical resistance between the power generation elements in the structure 95 was 1.5 m ⁇ . As described above, according to the present invention, the current collector can be prevented from being damaged, and the electrical resistance between the power generation elements can be reduced.
- the battery of the present invention can be used as a power source for electric vehicles and information devices, and the battery manufacturing method of the present invention can be used when manufacturing such a battery.
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Abstract
Description
本発明の第1の態様は、正極層、負極層、正極層と負極層との間に配設された電解質層、正極層に接続された正極集電体、及び、負極層に接続された負極集電体を具備する発電要素を複数備え、複数の発電要素は、捲回又は折りたたまれており、一の発電要素に含まれる正極集電体と該一の発電要素に隣接する他の発電要素に含まれる負極集電体とが、発電要素が捲回又は折りたたまれる前後の正極集電体及び負極集電体の長尺方向の全域に亘って、直接又は間接的に接続されていることを特徴とする、電池である。
2…負極層
3…電解質層
4…正極集電体
5…負極集電体
6…発電要素
7…構造体
8…接続部
9…捲回体
10…電池
11…固定部材
20…電池
21…正極集電体
22…負極集電体
23…発電要素
24…導電体
25…接続部
26…構造体
27…捲回体
30…電池
31…正極集電体
32…負極集電体
33…発電要素
34…導電体
35…接続部
36…構造体
37…捲回体
91…正極集電体
92…負極集電体
93…発電要素
94…接続端子
95…構造体
また、捲回体9における発電要素間の電気抵抗は0.8mΩ、構造体26における発電要素間の電気抵抗は1.1mΩ、構造体36における発電要素間の電気抵抗は0.9mΩであった。これに対し、構造体95における発電要素間の電気抵抗は1.5mΩであった。
以上より、本発明によれば、集電体の破損を抑制することができ、発電要素間の電気抵抗を低減することができた。
Claims (10)
- 正極層、負極層、前記正極層と前記負極層との間に配設された電解質層、前記正極層に接続された正極集電体、及び、前記負極層に接続された負極集電体を具備する発電要素を複数備え、
複数の前記発電要素は、捲回又は折りたたまれており、
一の前記発電要素に含まれる前記正極集電体と前記一の発電要素に隣接する他の発電要素に含まれる前記負極集電体とが、前記発電要素が捲回又は折りたたまれる前後の前記正極集電体及び前記負極集電体の長尺方向の全域に亘って、直接又は間接的に接続されていることを特徴とする、電池。 - 曲げられた前記正極集電体と曲げられた前記負極集電体とが嵌め合わされて、前記正極集電体と前記負極集電体とが接続されていることを特徴とする、請求の範囲第1項に記載の電池。
- 接続された前記正極集電体及び前記負極集電体が、固定部材を介して固定されていることを特徴とする、請求の範囲第2項に記載の電池。
- 前記正極集電体及び前記負極集電体と接触する導電体を介して、前記正極集電体と前記負極集電体とが接続されていることを特徴とする、請求の範囲第1項~請求の範囲第3項のいずれか1項に記載の電池。
- 曲げられた前記正極集電体と曲げられた前記導電体とが嵌め合わされ、且つ、曲げられた前記導電体と曲げられた前記負極集電体とが嵌め合わされていることを特徴とする、請求の範囲第4項に記載の電池。
- 正極層、負極層、前記正極層と前記負極層との間に配設された電解質層、前記正極層に接続された正極集電体、及び、前記負極層に接続された負極集電体を具備する複数の発電要素を作製する発電要素作製工程と、
前記発電要素作製工程で作製された一の前記発電要素に含まれる前記正極集電体、及び、前記発電要素作製工程で作製された他の前記発電要素に含まれる前記負極集電体を、前記正極集電体及び前記負極集電体の長尺方向の全域に亘って、直接又は間接的に接続する接続工程と、
前記接続工程後に、複数の前記発電要素を捲回又は折りたたむ捲回折りたたみ工程と、
を有することを特徴とする、電池の製造方法。 - 前記接続工程が、曲げられた前記正極集電体と曲げられた前記負極集電体とを嵌め合わせることによって、前記正極集電体と前記負極集電体とを接続する工程であることを特徴とする、請求の範囲第6項に記載の電池の製造方法。
- さらに、前記捲回折りたたみ工程後に、接続された前記正極集電体及び前記負極集電体を、固定部材を用いて固定する固定工程、を有することを特徴とする、請求の範囲第7項に記載の電池の製造方法。
- 前記接続工程が、前記正極集電体及び前記負極集電体と接触する導電体を介して、前記正極集電体と前記負極集電体とを接続する工程であることを特徴とする、請求の範囲第6項~請求の範囲第8項のいずれか1項に記載の電池の製造方法。
- 前記接続工程が、曲げられた前記正極集電体と曲げられた前記導電体とを嵌め合わせ、且つ、曲げられた前記導電体と曲げられた前記負極集電体とを嵌め合わせることによって、前記正極集電体と前記負極集電体とを接続する工程であることを特徴とする、請求の範囲第9項に記載の電池の製造方法。
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KR1020127025705A KR101379838B1 (ko) | 2010-03-15 | 2010-03-15 | 전지 및 그 제조 방법 |
US13/583,076 US20130004815A1 (en) | 2010-03-15 | 2010-03-15 | Battery and manufacturing method thereof |
PCT/JP2010/054332 WO2011114421A1 (ja) | 2010-03-15 | 2010-03-15 | 電池及びその製造方法 |
JP2012505333A JP5500244B2 (ja) | 2010-03-15 | 2010-03-15 | 電池及びその製造方法 |
CN201080065303.1A CN102792488B (zh) | 2010-03-15 | 2010-03-15 | 电池及其制造方法 |
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- 2010-03-15 KR KR1020127025705A patent/KR101379838B1/ko not_active IP Right Cessation
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