WO2024117009A1 - 二次電池用通電部品およびその製造方法 - Google Patents

二次電池用通電部品およびその製造方法 Download PDF

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Publication number
WO2024117009A1
WO2024117009A1 PCT/JP2023/042089 JP2023042089W WO2024117009A1 WO 2024117009 A1 WO2024117009 A1 WO 2024117009A1 JP 2023042089 W JP2023042089 W JP 2023042089W WO 2024117009 A1 WO2024117009 A1 WO 2024117009A1
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WO
WIPO (PCT)
Prior art keywords
current
secondary battery
foil
carrying component
materials
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2023/042089
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English (en)
French (fr)
Japanese (ja)
Inventor
伸之 船平
恵美 池田
真紀 佐竹
敦也 廣野
山崎　泰成
直生 本多
恭平 渡邉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nachi Fujikoshi Corp
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Nachi Fujikoshi Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nachi Fujikoshi Corp filed Critical Nachi Fujikoshi Corp
Priority to JP2024561439A priority Critical patent/JPWO2024117009A1/ja
Publication of WO2024117009A1 publication Critical patent/WO2024117009A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
    • 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
    • H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
    • 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
    • H01M50/502—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
    • H01M50/526—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the material having a layered structure
    • 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
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection

Definitions

  • the present invention relates to current-carrying components for secondary batteries, primarily installed in automobiles, and methods for manufacturing the same.
  • bus bars Current-carrying components formed from two or more sheets or foils, particularly those used in secondary batteries in automobiles, are also called bus bars, and technology has been disclosed for forming them from highly conductive materials such as aluminum alloys and copper alloys (see Patent Document 1).
  • the present invention aims to provide a current-carrying component for a secondary battery that can be joined to other components, such as electrode materials, without affecting the other components, even when the component is attached (joined) to the other components using a joining method such as laser welding, and a method for manufacturing the same.
  • the current-carrying component for a secondary battery of the present invention is formed from multiple sheets of aluminum or aluminum alloy foil material. These multiple sheets of foil material are stacked in the thickness direction, and adjacent foil sheets in the thickness direction of the foil material are joined by friction stir spot welding. In addition, there may be five or more sheets of these foil materials, and the thickness of each foil material may be 0.5 mm or less. Furthermore, the foil material may be further provided with a bent portion in which it is bent in a straight or curved shape.
  • each of the multiple aluminum or aluminum alloy foil materials to be laminated is less than 0.3 mm
  • the thickness of the plate material be more than 0.5 mm.
  • the thickness of the foil material to be placed be 0.3 mm or more and 0.5 mm or less.
  • the current-carrying component for a secondary battery of the present invention has a portion that is integrated by the friction stir spot joining method, so that even when the joining portion is joined to the electrode material by laser welding, the joining can be performed without affecting the electrode material.
  • the thickness of the portion that is integrated by the friction stir spot joining method can be controlled by the joining conditions, so it can be used under various laser welding conditions.
  • FIG. 1 is a plan view of a current-carrying component 100 for a secondary battery according to the present invention
  • FIG. 2 is a plan view of a current-carrying component 200 for a secondary battery according to the present invention.
  • FIG. 3 is a plan view of a current-carrying component 300 for a secondary battery according to the present invention.
  • 5 is a cross-sectional view of the current-carrying component 300 for a secondary battery taken along line CC in FIG. FIG.
  • FIG. 4 is a plan view of a current-carrying component 400 for a secondary battery according to the present invention.
  • 8 is a cross-sectional view of the current-carrying component 400 for a secondary battery shown in FIG. 7 along line D-D.
  • FIG. 1 is a plan view of a current-carrying component 500 for a secondary battery according to the present invention.
  • 9 is a cross-sectional view of the secondary battery current-carrying component 500 taken along line E-E.
  • FIG. 1 is a schematic diagram showing a first step in a method for producing an electric current-carrying component for a secondary battery according to the present invention.
  • FIG. 2 is a schematic diagram showing a second step in the method for producing an electric current-carrying component for a secondary battery according to the present invention.
  • FIG. 1 is a schematic diagram showing a third step in the method for producing an electric-conducting component for a secondary battery according to the present invention.
  • FIG. 2 is a schematic plan view of a test piece used in Examples 1 and 2.
  • FIG. 2 is a schematic front view of the test piece (Example) used in Examples 1 and 2.
  • FIG. 2 is a schematic front view of a test piece (comparative example) used in Examples 1 and 2.
  • FIG. 1 shows a plan view of a current-carrying component for secondary batteries 100 according to the first embodiment of the present invention
  • FIG. 2 shows a cross-sectional view taken along the A-A line in the plan view
  • FIG. 3 shows a plan view of a current-carrying component for secondary batteries 200 according to the second embodiment
  • FIG. 4 shows a cross-sectional view taken along the B-B line in the plan view
  • FIG. 5 shows a plan view of a current-carrying component for secondary batteries 300 according to the third embodiment
  • FIG. 6 shows a cross-sectional view taken along the C-C line in the plan view
  • FIG. 1 shows a plan view of a current-carrying component for secondary batteries 100 according to the first embodiment of the present invention
  • FIG. 2 shows a cross-sectional view taken along the A-A line in the plan view
  • FIG. 3 shows a plan view of a current-carrying component for secondary batteries 200 according to the second embodiment
  • FIG. 4 shows a cross-sectional
  • FIG. 7 shows a plan view of a current-carrying component for secondary batteries 400 according to the fourth embodiment
  • FIG. 8 shows a cross-sectional view taken along the D-D line in the plan view
  • FIG. 9 shows a plan view of a current-carrying component for secondary batteries 500 according to the fifth embodiment
  • FIG. 10 shows a cross-sectional view taken along the E-E line in the plan view.
  • the current-carrying component for a secondary battery (first embodiment) 100 of the present invention is formed by stacking a plurality of metal (aluminum or aluminum alloy) foil materials 10, 20, 30, etc. in the thickness direction as shown in Figures 1 and 2.
  • This current-carrying component for a secondary battery 100 has two joints 11, 12 as shown in Figures 1 and 2.
  • integrated portions Y11, Y12 are formed by mixing and kneading adjacent metal foil materials in the vertical direction by a friction stir spot joining method as shown in Figure 2.
  • the current-carrying component for a secondary battery (second embodiment) 200 of the present invention is formed by stacking a plurality of metal foil materials 110, 120, 130, etc. in the thickness direction as shown in Figures 3 and 4, similar to the current-carrying component for a secondary battery 100 of the first embodiment.
  • This current-carrying component for a secondary battery 200 has two joints 111, 112 as shown in Figures 3 and 4, similar to the current-carrying component for a secondary battery 100 of the first embodiment.
  • integrated portions Y111, Y112 are formed by mixing and kneading the metal foil materials adjacent to each other in the vertical direction by a friction-stir spot joining method as shown in Figure 4.
  • one or more long holes are provided in the center of the current-carrying component for secondary batteries (second embodiment) 200.
  • These long holes 113, 114, 115 relieve bending stresses and the like that occur when the current-carrying component for secondary batteries (second embodiment) 200 is attached (installed) to other components such as electrode materials, and at the same time, release heat that is generated when the current-carrying component for secondary batteries (second embodiment) 200 is energized, i.e., are useful for heat dissipation.
  • the current-carrying component for a secondary battery (third embodiment) 300 of the present invention is formed by stacking a plurality of metal foil materials 210, 220, 230, etc. in the thickness direction as shown in Figures 5 and 6, similar to the current-carrying component for a secondary battery 100 of the first embodiment.
  • This current-carrying component for a secondary battery 300 has two joints 211, 212 as shown in Figures 5 and 6, similar to the current-carrying component for a secondary battery 100 of the first embodiment.
  • integrated portions Y211, Y212 are formed by mixing and kneading the metal foil materials adjacent to each other in the vertical direction by a friction-stir spot joining method as shown in Figure 6.
  • a bent portion C1 is formed that is curved in the thickness direction (upward in FIG. 6).
  • This bent portion C1 is useful in that it relieves bending stresses that occur when the current-carrying component for secondary batteries (third embodiment) 300 is attached to other components such as electrode materials, prevents interference with other components when the current-carrying component for secondary batteries (third embodiment) 300 is attached to other components such as electrode materials, and allows the current-carrying component for secondary batteries (third embodiment) 300 to be efficiently arranged in a limited space.
  • the bent portion C1 shown in FIG. 6 is composed only of curved portions, it may have a shape composed of multiple straight portions or a shape that combines curved portions and straight portions.
  • the current-carrying component for a secondary battery (fourth embodiment) 400 of the present invention is formed by stacking a plurality of metal foil materials 310, 320, 330, etc. in the thickness direction as shown in Figures 7 and 8, similar to the current-carrying component for a secondary battery 100 of the first embodiment.
  • This current-carrying component for a secondary battery 400 has two joints 311, 312 as shown in Figures 7 and 8, similar to the current-carrying component for a secondary battery 100 of the first embodiment.
  • integrated portions Y311, Y312 are formed by mixing and kneading the metal foil materials adjacent to each other in the vertical direction by a friction-stir spot joining method as shown in Figure 8.
  • the secondary battery current-carrying part (fourth embodiment) 400 has one or more long holes (through holes) in the center, similar to the secondary battery current-carrying part 200 of the second embodiment.
  • These long holes 313, 314, 315 relieve bending stresses and the like that occur when the secondary battery current-carrying part (fourth embodiment) 400 is attached (installed) to other parts such as electrode materials, and at the same time, they are useful for releasing heat that is generated when the secondary battery current-carrying part (fourth embodiment) 400 is energized, i.e., for heat dissipation effects.
  • a bent portion C2 is formed that is bent in the thickness direction (upward in FIG. 8) in the same manner as the current-carrying component for secondary batteries 300 of the third embodiment.
  • This bent portion C2 is useful in that it relieves bending stresses and the like that occur when the current-carrying component for secondary batteries (fourth embodiment) 300 is attached to other components such as electrode materials, prevents interference with other components when the current-carrying component for secondary batteries (third embodiment) 300 is attached to other components such as electrode materials, and allows the current-carrying component for secondary batteries (third embodiment) 300 to be efficiently arranged in a limited space.
  • the bent portion C2 shown in FIG. 8 is composed only of curved portions, it may also be composed only of multiple straight portions or may have a shape that combines curved portions and straight portions.
  • the current-carrying component for a secondary battery (fifth embodiment) 500 of the present invention is formed by stacking a plurality of metal foil materials 410, 420, 430, etc. in the thickness direction as shown in Figures 9 and 10, similar to the current-carrying component for a secondary battery 100 of the first embodiment.
  • This current-carrying component for a secondary battery 500 has two joints 411, 412 as shown in Figures 9 and 10, similar to the current-carrying component for a secondary battery 100 of the first embodiment.
  • integrated portions Y411, Y412 are formed by mixing and kneading the metal foil materials adjacent to each other in the vertical direction by a friction-stir spot joining method as shown in Figure 10.
  • the joints 411, 412 are so-called through holes that pass from the front side to the back side of the current-carrying component for secondary batteries (fifth embodiment) 500, and are formed of small diameter parts 411a, 412a (diameter d1) and large diameter parts 411b, 412b (diameter d2) with different diameters. This is useful in that when the thickness of the current-carrying component for secondary batteries (fifth embodiment) 500 increases, the inside of the joints 411, 412 are stepped to reliably join and integrate the metal foil materials 410, 420, 430... and are also useful as positioning holes for the busbars. This stepped shape may also be applied to the current-carrying components for secondary batteries 200, 300, 400 of the second to fourth embodiments shown in Figures 3 to 8 described above.
  • the friction stir spot welding tool T is inserted from the plate material B side toward the metal foil materials 510, 520, 530... side to join the metal foil materials 510, 520, 530... to each other (second step: Figure 12).
  • the plate material B is pushed out of the outer periphery of the tool and joined to the adjacent metal foil material 510.
  • the friction stir spot welding tool T is removed from the metal foil materials 510, 520, 530, and plate material B (third step: FIG. 13).
  • the area where the friction stir spot welding tool T was removed is formed as the joint (joint) 511 of the secondary battery current-carrying component 600.
  • an integrated portion Y511 is formed around the joint (recess) 511, in which adjacent metal foil materials in the vertical direction are mixed and kneaded by the friction stir spot welding method, as shown in FIG. 13.
  • the thickness of each of the multiple aluminum or aluminum alloy foil materials to be stacked is less than 0.3 mm
  • the thickness of "plate material B" shown in Figure 11 can be more than 0.5 mm.
  • a foil material of the same composition as the multiple foil materials to be stacked may be further placed in the uppermost layer. In this case, it is preferable that the thickness of the foil material placed in the uppermost layer is 0.3 mm or more.
  • integrated parts Y11 and Y12 in FIG. 2 integrated parts Y111 and Y112 in FIG. 4, integrated parts Y211 and Y212 in FIG. 6, integrated parts Y311 and Y312 in FIG. 8, integrated parts Y411 and Y412 in FIG. 10, and integrated part Y511 in FIG. 13 show cross-sectional shapes in which all of the metal foil materials stacked in the thickness direction are integrated, but the joining shape of the metal foil materials joined by friction stir spot joining is not limited to the shapes shown in these figures.
  • the joints in the current-carrying component for a secondary battery of the present invention may be in a form in which, for example, multiple sheets of metal foil material near the surface layer are integrated (physically integrated) with each other, and the remaining sheets of metal foil material near the lower layer are in close contact (pressed) with each other.
  • Example 1 A test (hereinafter, referred to as a current test) was conducted to confirm the current performance when the current-carrying part of the present invention (Example) and the conventional current-carrying part (Comparative Example) were assembled into a secondary battery, and the test results will be described with reference to the drawings.
  • the test piece used in the current-carrying test of this embodiment was made by using two aluminum alloy (A1050) plate materials (width 20 mm x length 40 mm x thickness 1.2 mm) at both ends, and installing a foil or plate material made of the same aluminum alloy (A1050) in a form that bridges the ends of these two plate materials, and then joining the overlapping parts of the two plate materials by friction stir welding to produce a test piece.
  • a plan view of the test piece used in the current-carrying test (common to the Example and Comparative Example) is shown in FIG. 14, a front view of the Example in FIG. 15, and a front view of the Comparative Example in FIG. 16, respectively.
  • Table 1 shows the current-carrying voltage values (maximum voltage values) of the Examples and Comparative Examples in the current-carrying test and the electrical resistance values calculated from the current-carrying voltage values.
  • Current condition 1 current value 400A x current application time 1000 seconds
  • Current condition 2 current value 900A x current application time 30 seconds
  • the results of the current test were that when the current flow rate was 400 A and the current flow time was 1000 seconds, the voltage value was 0.26 V (electrical resistance value was 0.65 m ⁇ ) for both the Example and Comparative Example.
  • the voltage value for the Example was 0.56 V (electrical resistance value was 0.62 m ⁇ ) and the voltage value for the Comparative Example was 0.57 V (electrical resistance value was 0.63 m ⁇ ). No difference in voltage value (electrical resistance value) was observed between the Example and Comparative Example under any of the current flow conditions.
  • Example 2 Next, a test was conducted to confirm the lateral load resistance when the two types of current-carrying parts used in Example 1 were assembled into a secondary battery, and the test results will be described.
  • both the Example and the Comparative Example used test pieces of the same dimensions as those used in Example 1, and both ends of the test pieces were fixed to two gripping tools in the vertical direction attached to the Amsler tester, and then the load value at a predetermined stroke (the distance between the gripping tools in the vertical direction) was measured in a compression test mode in which the two gripping tools were moved closer to each other.
  • the results of the load values and the like of the Example and the Comparative Example measured when the stroke distance of the tester was 0.8 mm, 0.9 mm, and 1.0 mm are shown in Table 2.
  • the movement speed of the gripping tools of the Amsler tester was set to 1 mm/sec.
  • the load values for the Example at strokes of 0.8 mm and 0.9 mm were 80 N and 198 N, respectively, which were 30 to 40 N lower than the measured values for the Comparative Example at the same stroke. Furthermore, at a stroke of 1.0 mm, the aluminum alloy foil material in the center of the test piece was deformed (bent), and no deformation was observed at the joint or the gripped parts at both ends.
  • the load values for the comparative example at strokes of 0.8 mm and 0.9 mm were 111 N and 240 N, respectively, which were 30 to 40 N higher than the measured values for the example at the same stroke.
  • the gripping portions at both ends were deformed, and fracture of the joints was confirmed.
  • the Example current-carrying component in which aluminum alloy foil materials are laminated and bonded
  • the Comparative Example current-carrying component in which aluminum alloy plate materials are bonded together. Therefore, when bonding the Example (current-carrying component) to the electrode material, it has the advantage of being able to flexibly accommodate variations in the height and length of the electrode material, and to easily follow the movement of the electrode material even in a state in which the Example is bonded to the electrode material.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
PCT/JP2023/042089 2022-11-28 2023-11-23 二次電池用通電部品およびその製造方法 Ceased WO2024117009A1 (ja)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000225476A (ja) * 1999-02-05 2000-08-15 Showa Alum Corp 金属製ワーク同士の摩擦撹拌接合方法
JP2003126972A (ja) * 2001-10-19 2003-05-08 Hitachi Ltd 摩擦攪拌接合方法
JP2005103586A (ja) * 2003-09-30 2005-04-21 Nippon Chemicon Corp 摩擦撹拌溶接方法
JP2005111489A (ja) * 2003-10-03 2005-04-28 Toyota Motor Corp 異種材料の接合構造及び接合方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4385155B2 (ja) * 2003-09-30 2009-12-16 日本ケミコン株式会社 積層電子部品の製造方法
JP5858158B2 (ja) * 2012-06-29 2016-02-10 新神戸電機株式会社 二次電池の集電構造
WO2014163184A1 (ja) * 2013-04-04 2014-10-09 新神戸電機株式会社 二次電池の集電構造及び二次電池の集電構造形成方法
JP6252359B2 (ja) * 2014-05-27 2017-12-27 日立化成株式会社 蓄電デバイスおよびその製造方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000225476A (ja) * 1999-02-05 2000-08-15 Showa Alum Corp 金属製ワーク同士の摩擦撹拌接合方法
JP2003126972A (ja) * 2001-10-19 2003-05-08 Hitachi Ltd 摩擦攪拌接合方法
JP2005103586A (ja) * 2003-09-30 2005-04-21 Nippon Chemicon Corp 摩擦撹拌溶接方法
JP2005111489A (ja) * 2003-10-03 2005-04-28 Toyota Motor Corp 異種材料の接合構造及び接合方法

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