WO2011122455A1 - 電極端子、及び電極端子の製造方法 - Google Patents
電極端子、及び電極端子の製造方法 Download PDFInfo
- Publication number
- WO2011122455A1 WO2011122455A1 PCT/JP2011/057258 JP2011057258W WO2011122455A1 WO 2011122455 A1 WO2011122455 A1 WO 2011122455A1 JP 2011057258 W JP2011057258 W JP 2011057258W WO 2011122455 A1 WO2011122455 A1 WO 2011122455A1
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- WO
- WIPO (PCT)
- Prior art keywords
- electrode terminal
- mandrel
- outer cylinder
- base material
- output end
- Prior art date
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- 238000004519 manufacturing process Methods 0.000 title claims description 15
- 229910052751 metal Inorganic materials 0.000 claims abstract description 47
- 239000002184 metal Substances 0.000 claims abstract description 47
- 239000007787 solid Substances 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 40
- 229910052782 aluminium Inorganic materials 0.000 claims description 18
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 18
- 239000010949 copper Substances 0.000 claims description 17
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 15
- 229910052802 copper Inorganic materials 0.000 claims description 15
- 229910000838 Al alloy Inorganic materials 0.000 claims description 11
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 11
- 150000002739 metals Chemical class 0.000 claims description 9
- 230000002093 peripheral effect Effects 0.000 claims description 9
- 238000009931 pascalization Methods 0.000 claims 1
- 238000005260 corrosion Methods 0.000 abstract description 13
- 230000007797 corrosion Effects 0.000 abstract description 13
- 238000001125 extrusion Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 8
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 7
- 229910001416 lithium ion Inorganic materials 0.000 description 7
- 238000003466 welding Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- 230000002706 hydrostatic effect Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 150000002500 ions Chemical group 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000004381 surface treatment 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/172—Arrangements of electric connectors penetrating the casing
- H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
- H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
-
- 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
-
- 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
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/507—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising an arrangement of two or more busbars within a container structure, e.g. busbar modules
-
- 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
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
- H01M50/51—Connection only in series
-
- 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
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/521—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the material
- H01M50/522—Inorganic material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/547—Terminals characterised by the disposition of the terminals on the cells
- H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/552—Terminals characterised by their shape
- H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/552—Terminals characterised by their shape
- H01M50/561—Hollow metallic terminals, e.g. terminal bushings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/562—Terminals characterised by the material
-
- 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
-
- 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
Definitions
- the present invention relates to an electrode terminal that can be suitably used for a battery in which a positive output end and a negative output end are formed of different metals, and a method of manufacturing the electrode terminal.
- a battery As a battery to be mounted on an electric vehicle, a hybrid car, or the like, a battery is known in which a plurality of battery cells are connected to each other with a bus bar so that the positive and negative electrodes are connected in series (for example, a patent) Reference 1). Such an assembled battery is characterized by high output and high energy density, and in most cases, a lithium ion battery is used for the battery cell.
- the lithium ion battery has a positive output end formed from aluminum (Al) as a material and a negative output end formed from copper (Cu) as a material.
- bus bar a part used for distribution of electrical energy, also called a bus bar
- a bus bar As a method for manufacturing such a bus bar, for example, as disclosed in “Problems to be Solved by the Invention” of Patent Document 2, there is a method of laser welding members constituting the bus bar.
- Patent Document 2 As a countermeasure against this problem, as disclosed in Patent Document 2, it is proposed to manufacture a bus bar by joining an aluminum piece and a copper piece by laser welding or the like, but in a bus bar prototyped by this method, The eutectic due to two kinds of metals is generated at the laser welding part, and this causes the disadvantage that the electrical resistance becomes excessive and the mechanical strength (especially brittleness and tensile strength) is remarkably lowered. It did not endure.
- the present invention has been made in view of the above circumstances, and is an electrode terminal used for a battery in which a positive output end and a negative output end are formed of different metals, and prevents electrical corrosion while preventing electric corrosion.
- An object of the present invention is to provide a high-performance and high-reliability electrode terminal that can suppress resistance and also has excellent mechanical strength, and a method for manufacturing the electrode terminal.
- an electrode terminal is an electrode terminal for power output used for a battery in which a pair of output ends are formed of different metals, and is connected to one output end.
- the connecting portion and the second connecting portion are integrated by metal bonding.
- the first connection part is a solid cylindrical mandrel part
- the second connection part is a cylindrical outer cylinder part fitted around the mandrel part.
- metal bond forms a bonding interface in which different kinds of metals to be bonded are in close contact with each other at a metal structure level, and as a result, conductivity and mechanical bond strength are set to “values suitable for practical use as electrode terminals”. Shall be said to have been raised.
- a male screw part is formed on the outer peripheral surface of the outer cylinder part.
- the outer cylinder part may be formed to extend beyond the length of the mandrel part in a direction opposite to the protruding side of the mandrel part.
- the mandrel portion When the electrode terminal is employed as a positive output terminal of a lithium ion battery, the mandrel portion may be formed of aluminum or an aluminum alloy, and the outer cylinder portion may be formed of copper or a copper alloy. When adopting the electrode terminal as a negative output terminal of a lithium ion battery, the mandrel portion may be formed of copper or a copper alloy, and the outer cylinder portion may be formed of aluminum or an aluminum alloy.
- a facing base material in a state in which the metal base material forming the outer cylinder portion is wound so as to surround the metal base material forming the mandrel portion It is indispensable to prepare and employ a manufacturing method in which the facing material is extruded or drawn with a die in a high-pressure hydrostatic environment.
- this manufacturing method it is possible to manufacture an electrode terminal in which the metal material forming the mandrel portion and the metal material forming the outer cylinder portion are metallically coupled and integrated, and no electrical corrosion or the like occurs.
- the positive output terminal and the negative output terminal of the battery are made of the same metal in appearance, and the connection using the same metal wiring or bus bar as the terminal is performed, so that the electrical connection at the terminal junction is performed. Corrosion and the accompanying increase in electrical resistance can be suppressed, and the reliability of the assembled battery can be improved.
- the mandrel part and the outer cylinder part of the electrode terminal are integrated by a metallic bond, it is possible that an electric corrosion and an accompanying increase in electric resistance occur at this bonded part. No.
- the positive output terminal and the negative output terminal are suitable for a battery formed of different metals, can suppress electric resistance while preventing electric corrosion, and have excellent mechanical strength. An electrode terminal having high performance and high reliability can be realized.
- first Embodiment 1 to 3 show a first embodiment of an electrode terminal 1 according to the present invention.
- this electrode terminal 1 is a battery pack 4 formed by connecting a plurality of battery cells 2 in series by a bus bar 3, for example, a negative output end (negative output side) of each battery cell 2.
- a bus bar 3 for example, a negative output end (negative output side) of each battery cell 2.
- the battery cell 2 is a lithium ion battery, and the negative output end is formed of copper or a copper alloy.
- the negative electrode side carrier 7 base body for fixing electrons and ions
- the positive output end is formed of aluminum or an aluminum alloy.
- the electrode terminal 1 of the present invention employed at the negative output end includes a mandrel part 10 (first connecting part) and an outer cylinder part that externally covers the mandrel part 10. 11 (second connecting portion) and an inner / outer double shaft.
- the lower end side of the mandrel part 10 protrudes from the outer cylinder part 11 in the axial direction.
- the upper end side of the mandrel part 10 and the upper end part of the outer cylinder part 11 are aligned at the same height position.
- the mandrel part 10 is a round bar
- the outer cylinder part 11 is formed in a cylindrical shape. That is, the cross-sectional shape orthogonal to the axial direction of the mandrel part 10 and the outer cylinder part 11 is a concentric double circle, and the thickness of the outer cylinder part 11 surrounding the mandrel part 10 is substantially constant.
- a base portion 12 is formed on the lower end side of the outer cylinder portion 11, and the mandrel portion 10 projects downward so as to penetrate the base portion 12.
- a male thread portion 13 is formed on the outer peripheral surface of the outer cylinder portion 11 except for the base portion 12.
- the base portion 12 serves to keep the length of the male screw portion 13 protruding from the battery cell 2, or when the bus bar 3 is connected to the male screw portion 13.
- the bus bar 3 serves as a spacer that holds the bus bar 3 in a state of being lifted from the battery cell 2.
- the base portion 12 is not necessarily provided integrally with the outer cylinder portion 11, and may be a separate member.
- the maximum diameter (corresponding to the outer diameter of the base portion 12) of the electrode terminal 1 is 5 to 25 mm, and the maximum length (corresponding to the total length of the mandrel portion 10) is 10 to 100 mm.
- the external diameter of the external thread portion 13 provided in the outer cylinder portion 11 is set to a nominal diameter of 4 to 12 mm.
- the mandrel part 10 and the outer cylinder part 11 are made of different metals.
- the mandrel 10 is formed using the same metal as the negative electrode side carrier 7 of the battery cell 2, that is, copper or a copper alloy as a base material.
- the outer cylinder part 11 is formed using the same metal as the positive electrode side carrier and the plus output end of the battery cell 2, that is, aluminum or an aluminum alloy as a base material.
- the metal (Cu) of the mandrel part 10 and the metal (Al) of the outer cylinder part 11 are subjected to ultrahigh pressure (for example, about 1000 MPa) and As a result of imparting deformation, a bonding interface is formed in which the layers are in close contact with each other at the metal structure level, and as a result, the conductivity and mechanical bond strength are increased to a value suitable for practical use as an electrode terminal. Yes.
- the internal connection portion 15 is electrically connected to the negative electrode side carrier 7 of the battery cell 2.
- a portion where the external thread portion 13 is provided in the outer cylinder portion 11 is used as the external connection portion 16. That is, one end portion of the aluminum bus bar 3 made of the same metal as the outer tube portion 11 is connected to the external connection portion 16.
- connection holes 20 are provided at both ends of the bus bar 3, and the connection holes 20 are connected to the external connection portions 16 (outer cylinder portions 11) of the electrode terminals 1.
- the nut 21 made of the same metal as that of the outer cylinder portion 11 is screwed into the male screw portion 13 that has been penetrated.
- the external connection portion 16, the bus bar 3, and the nut 21 are connected by the same metal, and no electrical corrosion occurs.
- there is a dissimilar metal between the internal connection part 15 and the external connection part 16 between the mandrel part 10 and the outer cylinder part 11
- there is no electrical corrosion due to the metallic connection and The electrical resistance is held in a suppressed state.
- an electrode terminal in which all of the forming material is made of aluminum or an aluminum alloy may be used.
- the shape is substantially the same as that of the electrode terminal 1, and has a base portion 23 and a male screw portion 24. Therefore, the connection hole 20 on the other end side of the bus bar 3 is inserted into the male screw portion 24 of the positive electrode terminal, and the nut 21 is screwed into the male screw portion 24 that has penetrated. Needless to say, since the connecting portion between the positive output end and the bus bar 3 is also a connection made of the same metal, no electrical corrosion occurs.
- the assembled battery 4 configured by connecting a plurality of battery cells 2 in series by the bus bar 3, no electrical corrosion occurs in any connection portion, and highly efficient conductivity is ensured. .
- the mechanical strength as the electrode terminal 1 is also excellent, the electrode terminal 1 does not bend or bend under normal use conditions.
- the bus-bar 3 is formed with aluminum or aluminum alloy, it is lightweight and it becomes possible to suppress the assembled battery 4 to lightweight. Therefore, there is an advantage that is beneficial for reducing the weight of an electric vehicle in which the assembled battery 4 is mounted as a battery.
- extrusion processing is performed under an ultrahigh hydrostatic pressure.
- the extrusion device 30 used for this processing is equipped with a single-opening die 31 (die) corresponding to the maximum diameter of the electrode terminal 1 to be obtained (corresponding to the outer diameter of the base portion 12).
- Extrusion molding is possible under an isotropic pressure environment (about 1000 MPa).
- a positive electrode base material 11A metal base material
- a negative electrode base material 10A of the same metal as the negative output end of the battery cell 2 are used. (Metal base material) is prepared.
- the positive electrode base material 11A is made of aluminum or an aluminum alloy
- the negative electrode base material 10A is made of copper or a copper alloy. Then, a round bar-shaped billet (facing material) having a structure in which the rod-shaped negative electrode material 10A is surrounded by the positive electrode material 11A is formed.
- the negative electrode base material 10A may be a round bar
- the positive electrode base material 11A may be a hollow pipe material
- the positive electrode base material 11A may be externally inserted into the negative electrode base material 10A to form a billet.
- the negative electrode base material 10A may be a round bar
- the positive electrode base material 11A may be a strip plate material
- the positive electrode base material 11A may be wound around the negative electrode base material 10A to form a billet.
- the billet is loaded into the extrusion apparatus 30 and the extrusion apparatus 30 is operated under an isotropic pressure environment of ultrahigh pressure ( ⁇ 1000 MPa).
- the billet has a structure in which the negative electrode base material 10A is surrounded by the positive electrode base material 11A, and therefore the positive electrode base material 11A and the negative electrode base material 10A are parallel to each other. Be pushed out.
- the opening area of the die 31 of the extrusion device 30 is smaller than the cross-sectional area of the billet.
- the mating surfaces of the two base materials 10A and 11A form the “interface (metallic coupling portion) between the outer peripheral surface of the mandrel 10 and the inner peripheral surface of the outer cylinder 11” after exiting the die 31.
- the molded body 1A having an inner / outer double shaft in which the positive electrode base material 11A and the negative electrode base material 10A are integrally bonded by metal bonding is formed.
- the molded body 1A thus obtained is cut out at a predetermined interval in the extrusion direction.
- dye 31 of the extrusion apparatus 30 is formed in the opening shape corresponding to the cross-sectional shape of the electrode terminal 1, the cut-out space
- the base material 11A for the positive electrode is subjected to a lathe process or a male thread cutting process, and the male screw part 13, the base part 12, and the protruding part by the mandrel part 10 are formed to complete the electrode terminal 1.
- Surface polishing or surface treatment may be performed as necessary.
- 5A, 5B and 6 show a second embodiment of the electrode terminal 1 according to the present invention.
- the electrode terminal 1 of the second embodiment is also employed at the negative output end of the battery cell 2.
- the outer tube portion 11 of the electrode terminal 1 is extended upward so as to exceed the length of the mandrel portion 10. That is, the mandrel portion 10 does not exist inside the portion where the outer cylinder portion 11 is extended, and is hollow.
- the mandrel portion 10 of the electrode terminal 1 is formed to extend downward so as to exceed the length of the outer tube portion 11.
- the base part 12 and the external thread part 13 are not provided in the outer cylinder part 11, but are formed in a straight cylindrical shape.
- the mandrel portion 10 is made of the same metal (copper or copper alloy) as the negative electrode side carrier 7 of the battery cell 2, and the outer cylinder portion 11 is the same metal (aluminum or aluminum) as the positive electrode side carrier and the positive output end of the battery cell 2. Alloy) is the same as the first embodiment.
- the point that the outer peripheral surface of the mandrel part 10 and the inner peripheral surface of the outer cylinder part 11 are metallically connected by die processing under ultra-high pressure isotropic pressure is the same as in the first embodiment.
- the portion hollowed in the outer cylinder portion 11 is externally connected.
- one end portion of the bus bar 3 is connected to the external connection portion 16 by welding.
- the connection hole 20 of the bus bar 3 is inserted into the external connection portion 16 (corresponding to the hollow portion) of the electrode terminal 1 and the periphery of the penetrated external connection portion 16 is welded by welding or the like. do it. Since both the bus bar 3 and the external connection portion 16 are made of aluminum or an aluminum alloy and are the same metal, the welded portion does not cause eutectic, and the electrical resistance between them does not become excessive.
- the extrusion device 30 is operated under an ultra-high pressure isotropic pressure to form a molded body 1A. Then, it is only necessary to perform a centering process to hollow out the outer cylinder part 11 (delete the mandrel part 10 by a predetermined depth).
- other configurations, functions, effects, and manufacturing methods are substantially the same as those in the first embodiment, and detailed descriptions thereof are omitted here.
- the electrode terminal 1 used as the minus output end is illustrated, but the electrode terminal may be adopted as the plus output end.
- the mandrel part 10 is made of the same metal (aluminum or aluminum alloy) as the positive electrode side carrier of the battery cell 2
- the outer cylinder part 11 is made of the same metal (copper or copper alloy) as the negative electrode side carrier 7 of the battery cell 2.
- the bus bar 3 is made of copper or a copper alloy.
- the bus bar 1 according to the present invention is very suitable for connecting a lithium ion battery mounted on an automobile, but there is no problem even if it is used for connecting a lithium ion battery (battery) in other applications.
- Electrode terminal 1A Molded body 2 Battery cell 3 Bus bar 4 Battery assembly 7 Negative electrode side support 10 Mandrel part 10A Negative electrode base material 11 Outer cylinder part 11A Positive electrode base material 12 Base part 13 Male thread part 15 Internal connection part 16 External connection part 20 Connection hole 21 Nut 23 Base 24 Male thread 30 Extrusion device 31 Die
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- Electrochemistry (AREA)
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
Description
一般に、異種の金属同士を接続したときに空気中の水分による電気腐食(電気化学的腐食)が起こることは周知である。従って、この電気腐食の進行に伴い、バスバーと端子との間が通電しなくなったりバスバー自体又は端子自体が損壊したりすることが起こり、最終的には、電気自動車を始動できないといった重大問題に至る。
本発明は、上記事情に鑑みてなされたものであって、プラス出力端とマイナス出力端とが互いに異種金属で形成されたバッテリに対して用いる電極端子であって、電気腐食を防止しつつ電気抵抗を抑えることができ且つ機械的強度にも優れた高性能・高信頼性を有する電極端子と、この電極端子の製造方法とを提供することを目的とする。
また好ましくは、前記外筒部の外周面に雄ねじ部が形成されているとよい。
前記外筒部は、前記心棒部の突出側とは逆方向へ向けて当該心棒部の長さを超えて延長形成されていてもよい。
上記電極端子をリチウムイオン電池のマイナス出力端に採用するに際しては、前記心棒部は、銅又は銅合金で形成され、前記外筒部は、アルミニウム又はアルミニウム合金で形成されるようにするとよい。
この製造方法を採用することで、心棒部を形成する金属材と外筒部を形成する金属材とが金属的結合して一体化し、電気腐食等が起こらない電極端子を製造することができる。
本発明によれば、プラス出力端とマイナス出力端とが互いに異種金属で形成されたバッテリに対して好適で、電気腐食を防止しつつ電気抵抗を抑えることができ且つ機械的強度にも優れた高性能・高信頼性を有する電極端子を実現することができる。
[第1実施形態]
図1~図3は、本発明に係る電極端子1の第1実施形態を示している。
図1に示すように、この電極端子1は、複数のバッテリセル2をバスバー3によって直列接続することで構成される組電池4等において、例えば各バッテリセル2のマイナス出力端(マイナス出力側)として使用することができる。
心棒部10の下端側は外筒部11から軸方向に突出している。心棒部10の上端側と外筒部11の上端部とは、同じ高さ位置に揃えられている。心棒部10は丸棒とされ、外筒部11は円筒形に形成されている。すなわち、これら心棒部10と外筒部11との軸方向に直交する断面形状は同心の二重円形を呈しており、心棒部10を取り囲む外筒部11の肉厚は略一定である。
この土台部12は、この電極端子1をバッテリセル2へ取り付ける際に、バッテリセル2から雄ねじ部13が突出する長さを一定とする役目や、この雄ねじ部13にバスバー3を接続する際に、バスバー3をバッテリセル2から浮き上げた状態に保持させるスペーサーの役目を有している。土台部12は、必ずしも外筒部11に対して一体に設ける必要はなく、別部材としてもよい。
心棒部10と外筒部11とは、互いに形成素材が異なる金属により形成されている。心棒部10は、バッテリセル2の負極側担体7と同一金属、すなわち銅又は銅合金を元材として形成されている。また外筒部11は、バッテリセル2の正極側担体やプラス出力端と同一金属、すなわちアルミニウム又はアルミニウム合金を元材として形成されている。
このとき、外部接続部16とバスバー3ならびにナット21とは、同一金属による接続となり、電気腐食が起こることはない。加えて、内部接続部15と外部接続部16との間(心棒部10と外筒部11との間)は異種金属であるものの、金属的結合されているために電気腐食は起こらず、且つ電気抵抗が抑えられた状態に保持されている。
なお、第1実施形態では、バスバー3がアルミニウム又はアルミニウム合金によって形成されているため、軽量であり、組電池4を軽量に抑えることが可能となる。そのため、この組電池4をバッテリとして搭載する電気自動車の軽量化にとっても有益となる利点がある。
電極端子1の製造手順としては、まずバッテリセル2のプラス出力端と同一金属からなる正極用元材11A(金属元材)と、バッテリセル2のマイナス出力端と同一金属の負極用元材10A(金属元材)とを準備する。すなわち、正極用元材11Aはアルミニウム又はアルミニウム合金製であり、負極用元材10Aは銅又は銅合金製であるものとする。そして、棒状の負極用元材10Aを中心にして、その周りを正極用元材11Aで取り囲んだ構造の丸棒状のビレット(対面元材)を形成する。
図4に示す如く、押出装置30のダイ31の開口面積はビレットの断面積より小さいため、ダイ31を通すことで、ビレットが全周的な圧縮を受けて塑性変形する。両元材10A,11Aの合わせ面は、ダイ31を出た後に「心棒部10の外周面と外筒部11の内周面との界面(金属的結合部)」を形成することになる。
このようにして得られた成形体1Aを、押出方向で所定間隔をおいて切り出す。第1実施形態では、押出装置30のダイ31が電極端子1の断面形状に対応した開口形状に形成されているため、成形体1Aの切り出し間隔は、電極端子1としての長さ寸法に合わせるようにした。
[第2実施形態]
図5A、図5B、及び、図6は、本発明に係る電極端子1の第2実施形態を示している。
図5A、及び、図5Bに示す如く、電極端子1の外筒部11は上方側に向けて、心棒部10の長さを超えるように延長形成されている。すなわち、外筒部11が延長された部分の内部には心棒部10が存在せず、中空とされている。一方で、電極端子1の心棒部10は下方側に向けて、外筒部11の長さを超えるように延長形成されている。加えて、外筒部11には土台部12や雄ねじ部13は設けられておらず、ストレートの円筒形に形成されている。
具体的には、図6に示したように、バスバー3の接続孔20を電極端子1の外部接続部16(中空部分に対応)へ差し込んで、突き抜けた外部接続部16まわりを溶接などにより溶接すればよい。溶接部分は、バスバー3も外部接続部16も、共にアルミニウム又はアルミニウム合金であって、同一金属であるから共晶は生じず、両者間の電気抵抗が過大となることもない。
第2実施形態においてその他の構成及び作用効果、製造方法は第1実施形態とほぼ同じであり、ここでの詳説は省略する。
例えば、第1実施形態及び第2実施形態においては、マイナス出力端として使用する電極端子1を例示したが、電極端子をプラス出力端に採用してもよい。その場合、心棒部10をバッテリセル2の正極側担体と同一金属(アルミニウム又はアルミニウム合金)製とし、外筒部11をバッテリセル2の負極側担体7と同一金属(銅又は銅合金)製とするとよい。バスバー3は銅又は銅合金製とする。
本出願は、2010年3月29日出願の日本特許出願(特願2010-075916)に基づくものであり、その内容はここに参照として取り込まれる。
1A 成形体
2 バッテリセル
3 バスバー
4 組電池
7 負極側担体
10 心棒部
10A 負極用元材
11 外筒部
11A 正極用元材
12 土台部
13 雄ねじ部
15 内部接続部
16 外部接続部
20 接続孔
21 ナット
23 土台部
24 雄ねじ部
30 押出装置
31 ダイ
Claims (7)
- 一対の出力端が互いに異種金属で形成されるバッテリに対して用いる電力出力用の電極端子であって、
一方の出力端に連結すると共にこの一方の出力端と同一金属で形成された第1接続部と、
前記第1接続部に連接すると共に他方の出力端と同一金属で形成された第2接続部とを備え、
前記第1接続部と前記第2接続部とが金属的結合により一体化されていることを特徴とする電極端子。 - 前記第1接続部は、中実円柱状の心棒部であり、
前記第2接続部は、前記心棒部に外嵌する円筒形状の外筒部となっていることを特徴とする請求項1に記載の電極端子。 - 前記外筒部の外周面に雄ねじ部が形成されていることを特徴とする請求項2に記載の電極端子。
- 前記外筒部は、前記心棒部の突出側とは逆方向へ向けて当該心棒部の長さを超えて延長形成されていることを特徴とする請求項2に記載の電極端子。
- 前記心棒部は、アルミニウム又はアルミニウム合金で形成され、
前記外筒部は、銅又は銅合金で形成されていることを特徴とする請求項2に記載の電極端子。 - 前記心棒部は、銅又は銅合金で形成され、
前記外筒部は、アルミニウム又はアルミニウム合金で形成されていることを特徴とする請求項2に記載の電極端子。 - 前記心棒部を形成する金属元材を取り囲むように、前記外筒部を形成する金属元材が巻き付けられた状態となっている対面元材を用意し、
高圧の静水圧環境下にて、前記対面元材をダイにより押出加工又は引抜加工することで、請求項2に記載された電極端子を製造することを特徴とする電極端子の製造方法。
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US13/579,756 US9023515B2 (en) | 2010-03-29 | 2011-03-24 | Electrode terminal and method for producing electrode terminal |
EP11762686.1A EP2555281B1 (en) | 2010-03-29 | 2011-03-24 | Electrode terminal, and method for producing electrode terminal |
CN201180010726.8A CN102770987B (zh) | 2010-03-29 | 2011-03-24 | 电极端子及电极端子的制造方法 |
KR1020127025600A KR101421859B1 (ko) | 2010-03-29 | 2011-03-24 | 전극 단자 및 전극 단자의 제조 방법 |
ES11762686.1T ES2656333T3 (es) | 2010-03-29 | 2011-03-24 | Terminal de electrodo, y método para producir terminal de electrodo |
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JP5910487B2 (ja) * | 2012-12-25 | 2016-04-27 | 株式会社オートネットワーク技術研究所 | 配線用モジュール |
US9853276B2 (en) * | 2013-01-11 | 2017-12-26 | Panasonic Intellectual Property Management Co., Ltd. | Battery pack |
KR20150015153A (ko) * | 2013-07-31 | 2015-02-10 | 주식회사 엘지화학 | 이종 금속의 전지모듈 접속부재를 포함하는 전지팩 |
KR20150070522A (ko) * | 2013-12-17 | 2015-06-25 | 삼성에스디아이 주식회사 | 배터리 모듈 |
KR20160038582A (ko) * | 2014-09-30 | 2016-04-07 | 삼성에스디아이 주식회사 | 이차 전지 |
KR101862437B1 (ko) * | 2014-10-02 | 2018-05-29 | 주식회사 엘지화학 | 이차전지용 캡 조립체 및 그의 제조방법 |
US10128486B2 (en) | 2015-03-13 | 2018-11-13 | Purdue Research Foundation | Current interrupt devices, methods thereof, and battery assemblies manufactured therewith |
CN106216632B (zh) * | 2015-04-22 | 2018-02-27 | 泉州华科模具有限公司 | 一种电池端子注塑模具 |
US9728345B1 (en) * | 2016-02-04 | 2017-08-08 | Ls Mtron Ltd | Ultra capacitor module |
CN108701804A (zh) * | 2016-02-19 | 2018-10-23 | 株式会社杰士汤浅国际 | 蓄电元件以及蓄电元件的制造方法 |
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