WO2023032740A1 - Boîtier de batterie et procédé de fabrication de boîtier de batterie - Google Patents

Boîtier de batterie et procédé de fabrication de boîtier de batterie Download PDF

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Publication number
WO2023032740A1
WO2023032740A1 PCT/JP2022/031620 JP2022031620W WO2023032740A1 WO 2023032740 A1 WO2023032740 A1 WO 2023032740A1 JP 2022031620 W JP2022031620 W JP 2022031620W WO 2023032740 A1 WO2023032740 A1 WO 2023032740A1
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WO
WIPO (PCT)
Prior art keywords
steel plate
cross member
battery case
frame
welding
Prior art date
Application number
PCT/JP2022/031620
Other languages
English (en)
Japanese (ja)
Inventor
励一 鈴木
憲一 渡辺
陽一朗 下田
正敏 吉田
Original Assignee
株式会社神戸製鋼所
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Filing date
Publication date
Application filed by 株式会社神戸製鋼所 filed Critical 株式会社神戸製鋼所
Publication of WO2023032740A1 publication Critical patent/WO2023032740A1/fr

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    • 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
    • B23K9/00—Arc welding or cutting
    • 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
    • B23K9/00—Arc welding or cutting
    • B23K9/02—Seam welding; Backing means; Inserts
    • 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
    • B23K9/00—Arc welding or cutting
    • B23K9/23—Arc welding or cutting taking account of the properties of the materials to be welded
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/218—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material
    • H01M50/22—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks
    • H01M50/222—Inorganic material
    • H01M50/224—Metals
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
    • 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

Definitions

  • the present invention relates to a battery case and a method for manufacturing a battery case.
  • a battery system mounted on such a vehicle generally has a structure in which a large number of batteries (batteries, battery cells) are housed in a battery case constituted by a predetermined frame or the like.
  • the battery case that houses the battery must be strong enough to protect the battery from impacts such as collisions.
  • a typical battery case 100 includes a rectangular frame portion 101 made up of four frame members 102 and a plate-like floor disposed on the bottom surface of the frame portion 101. It has a shaped portion 103 and a plurality of cross members 104 whose ends are joined to the frame shaped portion 101 for strength enhancement.
  • a frame member 102 and the cross member 104 an extruded aluminum material is often used because of its light weight and high rigidity.
  • a side frame having a closed cross-sectional structure made of aluminum and a cross member having a closed cross-sectional structure made of aluminum are fastened together via a fastening member to form a frame member. It is described to prevent a decrease in the bond strength of the.
  • the fastening member is made of an aluminum material and is a ⁇ -shaped extruded profile having a flat plate-shaped base and a pair of support portions extending in a direction perpendicular to the base.
  • the base portion is fastened to the side surface of the side frame with bolts, the pair of support portions sandwiches the ends of the cross member, and the cross member and the support portion are welded together at weld portions.
  • the frame member 102 and the cross members 104 that constitute the frame-shaped portion 101 are all made of aluminum, weight reduction is possible, but the cost is higher than when materials such as steel and iron are used. Become. On the other hand, if the frame member 102 and the cross member 104 are all made of steel, the cost can be reduced, but the weight increases.
  • the present invention has been made in view of the problems described above, and an object thereof is to provide a lightweight and low-cost battery case and a method for manufacturing the battery case.
  • the above object of the present invention is achieved by the following configuration [1] relating to a battery case.
  • the cross member is made of steel,
  • the battery case wherein the steel plate and the one longitudinal end of the cross member are joined by welding.
  • the above object of the present invention is achieved by the following configuration [2] relating to the method for manufacturing a battery case.
  • [2] a rectangular frame-shaped portion; at least one cross member extending toward a pair of parallel wall surfaces of the frame-shaped portion so as to partition the interior of the frame-shaped portion; with The frame-shaped portion is made of aluminum or an aluminum alloy,
  • the cross member is made of steel,
  • a method for manufacturing a battery case in which a steel plate is welded to the wall surface of the frame-shaped portion, The steel plate has a first hole facing the wall surface, , joining the steel plate and the wall surface by filling the first hole with aluminum or aluminum alloy weld metal;
  • the present invention it is possible to provide a lightweight and low-cost battery case and a method for manufacturing the battery case.
  • FIG. 1 is a perspective view of a battery case according to a first embodiment
  • FIG. FIGS. 2A to 2E are diagrams for explaining the manufacturing method of the battery case.
  • FIG. 3 is a diagram for explaining a method of welding the steel plate and the first frame member.
  • FIG. 4 is a cross-sectional view of the joint between the steel plate and the first frame member.
  • FIG. 5 is a cross-sectional view of the joint between the cross member and the floor.
  • FIGS. 6A to 6D are diagrams for explaining the manufacturing method of the battery case according to the first modified example of the first embodiment.
  • FIGS. 7A to 7E are diagrams for explaining the manufacturing method of the battery case according to the second embodiment.
  • FIGS. 8A to 8E are diagrams for explaining the manufacturing method of the battery case according to the first modified example of the second embodiment.
  • FIGS. 9A to 9E are diagrams for explaining a method of manufacturing a battery case according to a second modification of the second embodiment.
  • FIGS. 10A to 10G are diagrams for explaining a method of manufacturing a battery case according to the third modified example of the second embodiment.
  • FIGS. 11A to 11G are diagrams for explaining a method of manufacturing a battery case according to the fourth modified example of the second embodiment.
  • FIGS. 12A to 12E are diagrams for explaining a method for manufacturing a battery case according to the fifth modified example of the second embodiment.
  • 13A to 13E are diagrams for explaining the manufacturing method of the battery case according to the third embodiment.
  • FIGS. 14 is a cross-sectional view taken along line XIV-XIV of FIG. 13(e).
  • FIGS. 15(a) to 15(d) are diagrams for explaining the manufacturing method of the battery case according to the first modified example of the third embodiment.
  • FIGS. 16A to 16E are diagrams for explaining the manufacturing method of the battery case according to the second modified example of the third embodiment.
  • FIG. 17 is a cross-sectional view along line XVII-XVII of FIG. 16(e).
  • 18(a) to (e) are diagrams showing modifications of the steel plate.
  • FIGS. 19A to 19D are diagrams for explaining a method of manufacturing a battery case according to the third modified example of the third embodiment.
  • FIGS. 19A to 19D are diagrams for explaining a method of manufacturing a battery case according to the third modified example of the third embodiment.
  • FIGS. 20A to 20E are diagrams for explaining a method of manufacturing a battery case according to the fourth modified example of the third embodiment.
  • 21(a) to (d) are diagrams for explaining a method of manufacturing a battery case according to the fifth modification of the third embodiment.
  • FIGS. 22A to 22E are diagrams for explaining the manufacturing method of the battery case according to the fourth embodiment.
  • FIG. 23 is a cross-sectional view taken along line XXIII-XXIII of FIG. 22(e).
  • FIGS. 24A to 24E are diagrams for explaining a method of manufacturing a battery case according to the first modified example of the fourth embodiment.
  • 25(a) to (e) are diagrams for explaining a method of manufacturing a battery case according to the second modification of the fourth embodiment.
  • FIG. 26A to 26E are diagrams for explaining the manufacturing method of the battery case according to the fifth embodiment.
  • 27A to 27E are diagrams for explaining a method of manufacturing a battery case according to a modification of the fifth embodiment.
  • FIG. 28 is a cross-sectional view taken along line XXVIII--XXVIII of FIG. 27(e).
  • FIG. 29A is a perspective view showing an example of a method for manufacturing a steel plate.
  • FIG. 29B is a perspective view showing an example of a method for manufacturing a steel plate.
  • FIG. 30A is a perspective view showing an example of a steel plate;
  • FIG. 30B is a perspective view showing an example of a steel plate;
  • FIG. 30C is a perspective view showing an example of a steel plate;
  • FIG. 30D is a perspective view showing an example of a steel plate
  • FIG. 30E is a perspective view showing an example of a steel plate
  • FIG. 30F is a perspective view showing an example of a steel plate
  • FIG. 30G is a perspective view showing an example of a steel plate
  • FIG. 31 is a perspective view of a conventional battery case.
  • FIG. 1 is a perspective view of a battery case 10 according to the first embodiment.
  • the battery case 10 of the present embodiment includes a rectangular frame portion 11 configured by a plurality of first and second frame members 12 and 13, and the frame portion 11 disposed inside the frame portion 11. and a floor-like portion 40 connected to the frame-like portion 11 so as to constitute the bottom surface of the battery case 10 .
  • the plurality of first and second frame members 12 and 13 that constitute the frame-shaped portion 11 and the floor-shaped portion 40 are all made of aluminum or an aluminum alloy (hereinafter also referred to as aluminum material).
  • Cross member 20 is made of steel. In this way, among the constituent members of the battery case 10, the frame-like portion 11 and the floor-like portion 40 are made of aluminum, while the cross member 20 is made of steel, so that both weight reduction and cost reduction can be achieved. .
  • the frame-shaped portion 11 includes a pair of first frame members 12 arranged parallel to each other, a pair of second frame members 13 having both ends joined to both ends of the pair of first frame members 12, is formed in a rectangular shape in plan view.
  • FIG. 2B are diagrams for explaining the manufacturing method of the battery case 10.
  • FIG. 2B the edge of the end surface of the second frame member 13 is in a state where the end surface of the second frame member 13 abuts against the side surface 12a of the end of the first frame member 12.
  • the first frame member 12 and the second frame member 13 are joined by line-welding the corner formed by the portion and the side surface 12a of the first frame member 12 by arc welding. Therefore, the pair of parallel wall surfaces of the frame-shaped portion 11 are formed by the pair of side surfaces 12a of the pair of first frame members 12 facing each other.
  • welding between the first frame member 12 and the second frame member 13 is performed by an MIG welding device 50 (hereinafter also referred to as an “aluminum MIG welding device”) using aluminum or an aluminum alloy as a consumable electrode (welding wire).
  • an MIG welding device 50 hereinafter also referred to as an "aluminum MIG welding device”
  • aluminum or an aluminum alloy as a consumable electrode (welding wire).
  • the first frame member 12 and the second frame member 13 are arranged on the floor-like portion 40 made of a plate material. Then, as shown in FIG. 2B, the corners formed by the lower surfaces of the first frame member 12 and the second frame member 13 and the upper surface of the floor-like portion 40 are also line-welded by the aluminum MIG welding device 50. be. Therefore, the aluminum weld metal WA is also formed at these welding locations.
  • flanges (not shown) extending along the floor portion 40 may be formed on the lower surfaces of the first frame member 12 and the second frame member 13, and the flanges of the first and second frame members 12 and 13 may be formed. and the floor-like portion 40 may be line-welded by an aluminum MIG welding device 50 .
  • Each cross member 20 is a member for improving the strength of the battery case 10, and is frame-shaped so as to partition the inside of the frame-shaped portion 11 partitioned by the four first and second frame members 12 and 13. Extending toward a pair of parallel wall surfaces of the portion 11 (side surfaces 12a facing each other of the pair of first frame members 12)
  • the length of the cross member 20 in the longitudinal direction is slightly shorter than the length of the second frame member 13 in the longitudinal direction.
  • a steel plate 30 is arranged between both ends and the side surfaces 12 a of the pair of first frame members 12 .
  • the steel plate 30 is a steel plate member extending along the side surface 12a of the first frame member 12, and is welded to the side surface 12a.
  • a plurality of first holes 31 are formed in the steel plate 30 at positions avoiding locations where the cross member 20 is joined.
  • the plurality of first holes 31 are arranged in the width direction (upper left and lower Direction) Six first holes 31 are formed on each side.
  • the cross member 20 is joined between the first holes 31 formed on both sides of the steel plate 30 in the width direction, that is, in the middle portion of the steel plate 30 in the width direction.
  • the first hole 31 is a through hole that penetrates the steel plate 30 in the thickness direction and faces the side surface 12 a of the first frame member 12 .
  • the first hole 31 serves as a hole for joining the steel plate 30 to the side surface 12a by welding.
  • the steel plate 30 is made of steel, while the first frame member 12 is made of aluminum. Therefore, if the two dissimilar materials are to be joined by normal arc welding, the steel and aluminum materials are joined together.
  • the intermetallic compound that is used is a problem. Since intermetallic compounds (such as Al 3 Fe and Al 5 Fe 2 ) of Fe (steel) and Al (aluminum material) have brittle properties, there is a possibility that cracks will occur in the weld zone.
  • the battery case 10 is large in size, it is physically difficult for a C-clamp, which is required in many dissimilar metal joining methods, to enter, and a dissimilar metal joining method that does not use a C-clamp is required.
  • FIG. 3 is a diagram for explaining the method of welding the steel plate 30 and the first frame member 12 together.
  • a steel plate 30 having a first hole 31 is superimposed on the side surface 12a of the first frame member 12, spot welded by an aluminum MIG welding device 50, and the first hole of the steel plate 30 is welded. Penetration is obtained through 31 .
  • a method of spot welding a steel member and an aluminum member through a through hole provided in the steel member using the aluminum MIG welding apparatus 50 will be referred to as "dissimilar material MIG spot welding".
  • the shield gas G a known inert gas such as argon or helium is used.
  • FIG. 4 is a cross-sectional view of the joint between the steel plate 30 and the first frame member 12.
  • the aluminum weld metal WA consists of a shaft portion WA1 that extends in the thickness direction of the steel plate 30 and reaches the first frame member 12, and a tip portion of the shaft portion WA1 that protrudes outside the steel plate 30 and expands to the outer peripheral side. It has a rivet shape having a protruding head WA2 and a flange WA3 protruding outward from the base end protruding into the first frame member 12 of the shaft WA1.
  • the steel plate 30 and the first frame member 12 are sandwiched and fixed between the head portion WA2 and the flange portion WA3.
  • the steel plate 30 and the side surface 12a of the first frame member 12 are joined at the plurality of first holes 31 by dissimilar material MIG spot welding.
  • the number, arrangement, etc. of the first holes 31 are not particularly limited.
  • the cross member 20 has an inverted U-shaped cross section with an opening at the lower end in the height direction (vertical direction in the figure), and the longitudinal direction (vertical direction in the figure). It also has openings at both ends in the left and right direction of the inside.
  • a pair of flange portions 21 , 21 extending along the floor portion 40 are provided at the lower end portion of the cross member 20 in the height direction.
  • the pair of flange portions 21 , 21 extends over the entire longitudinal length of the cross member 20 in the height direction and the width direction perpendicular to the longitudinal direction (upper right, lower left direction in the drawing).
  • the cross member 20 has an upper surface 26 , a pair of side surfaces 24 extending downward from both widthwise ends of the upper surface 26 , and flange portions 21 extending vertically from the lower ends of the respective side surfaces 24 .
  • a plurality of third holes 22 are formed in the flange portion 21 so as to penetrate the flange portion 21 in the vertical direction and face the floor portion 40 .
  • the plurality of third holes 22 of the present embodiment are arranged at equal intervals in the longitudinal direction of the cross member 20, but the number, arrangement, etc. of the third holes 22 are not particularly limited.
  • FIG. 5 is a cross-sectional view of the joint between the cross member 20 and the floor portion 40. As shown in FIG. As shown in FIG. 5, after welding the flange portion 21 and the floor portion 40, the third hole 22 is filled with the aluminum weld metal WA.
  • the aluminum weld metal WA consists of a shaft portion WA1 that extends in the thickness direction of the flange portion 21 and reaches the floor portion 40, and a tip end portion of the shaft portion WA1 that protrudes outside the flange portion 21 to the outer peripheral side.
  • It has a rivet shape having a bulging head WA2 and a flange WA3 bulging outward from the base end portion of the shaft WA1 protruding outside the floor-like portion 40 .
  • the flange portion 21 and the floor portion 40 are sandwiched and fixed between the head portion WA1 and the flange portion WA3.
  • cross member 20 and the floor-like portion 40 are joined by dissimilar material MIG spot welding at the plurality of third holes 22 .
  • Both ends of the cross member 20 in the longitudinal direction and the steel plates 30 joined to the side surfaces 12a of the pair of first frame members 12 are joined by welding.
  • one end of the cross member 20 in the longitudinal direction is butted against the steel plate 30 , and the edge of the one end in the longitudinal direction of the cross member 20 and the steel plate 30 form the edge.
  • the corners to be welded are line welded with arc welding.
  • the other longitudinal end of the cross member 20 is similarly welded to the steel plate 30 .
  • a MAG welding device 60 (hereinafter also referred to as a “steel MAG welding device") using steel as a consumable electrode (welding wire). Therefore, the cross member 20 and the steel plate 30 are joined by a steel weld metal WS (hereinafter also referred to as "steel weld metal").
  • a battery (not shown) is accommodated in each compartment of the battery case 10 partitioned by the frame-shaped part 11 and the plurality of cross members 20 .
  • the first and second frame members 12 and 13 are made of hollow extruded aluminum material having a thickness of about 2 to 5 mm, and the type of aluminum alloy used has excellent strength.
  • aluminum alloys such as 5000 series, 6000 series, and 7000 series according to JIS to AA are applied because they can be made thinner.
  • Aluminum alloy hollow extruded profiles are produced by appropriately combining casting such as DC casting and continuous casting, homogenization heat treatment, hot extrusion, solution treatment and quenching, and if necessary, tempering such as artificial aging. , manufactured by normal profile manufacturing processes. By manufacturing the first and second frame members 12 and 13 by extrusion molding from an aluminum material, weight reduction can be achieved.
  • the cross member 20 can be manufactured by bending a plate of general carbon steel or high-strength steel into an ⁇ shape, or by crushing a circular steel pipe into a mouth shape. Furthermore, for example, it is possible to weld a rib plate into the ⁇ -shaped cross section, or bend it into an S-shape or B-shape and weld the joints to form a "H" shape.
  • the steel sheet can be subjected to surface treatment such as various types of plating such as zinc and electrodeposition coating for the purpose of anticorrosion.
  • the frame-shaped portion 11 is formed by welding the first and second frame members 12 and 13 together with an aluminum MIG welding device 50, which is a common welding device. Further, the frame-shaped portion 11 is welded to the floor-shaped portion 40 by an aluminum MIG welding device 50, which is a common welding device. Note that welding between the steel plate 30 and the side surface 12a of the first frame member 12, welding between the first frame member 12 and the second frame member 13, and welding between the frame-shaped portion 11 and the floor-shaped portion 40 are performed by the aluminum MIG welding device 50. The order of welding is not particularly limited.
  • the flange portion of the cross member 20 is welded by the aluminum MIG welding device 50 while the cross member 20 is abutted against the steel plate 30 on the floor portion 40 and positioned. 21 is welded to the floor 40;
  • the longitudinal end of the cross member 20 is welded to the steel plate 30 by the steel MAG welding device 60 .
  • the battery case 10 is manufactured through such processes.
  • the order of the welding processes may be changed as appropriate, but the welding processes performed using the aluminum MIG welding device 50, which is a common welding device, may be performed consecutively to shorten the working time.
  • the frame-shaped portion 11 is made of aluminum or an aluminum alloy
  • the cross member 20 is made of steel
  • the side surface 12a frame A steel plate 30 is welded to the wall surface of the shaped portion 11, and the steel plate 30 and one longitudinal end of the cross member 20 are welded. Therefore, among the constituent members of the battery case 10, the frame-shaped portion 11 is made of aluminum, while the cross member 20 is made of steel, so that both weight reduction and cost reduction can be achieved.
  • the steel plate 30 is welded to the wall surface of the frame-shaped portion 11 and the cross member 20 is further welded to the steel plate 30, the cross member 20 is firmly attached to the frame-shaped portion 11 via the steel plate 30. can be fixed.
  • the steel plate 30 is formed with a first hole 31 facing the side surface 12 a of the first frame member 12 , and the steel plate 30 and the side surface 12 a are joined by welding through the first hole 31 . Therefore, the steel plate 30 and the aluminum first frame member 12 can be reliably joined by welding through the first hole 31 .
  • a C-shaped clamp is not required, and there is no need to provide a through hole in the frame-shaped portion 11, so that water can be prevented from entering the battery case 10 as well.
  • the steel plate 30 and the aluminum first frame member 12 can be reliably joined by welding through the first hole 31. .
  • the battery case 10 further has a floor-like portion 40 that is connected to the frame-like portion 11 and constitutes a floor surface.
  • the floor-like portion 40 is made of aluminum or an aluminum alloy. 40 is joined by welding. Therefore, among the constituent members of the battery case 10, the frame-like portion 11 and the floor-like portion 40 are made of aluminum, while the cross member 20 is made of steel. Furthermore, the cross member 20 and the floor-like portion 40 are firmly joined by welding.
  • the cross member 20 has a flange portion 21 extending along the floor portion 40.
  • the flange portion 21 is formed with a third hole 22 facing the floor portion 40.
  • the flange portion 21 and the floor portion 40 are separated from each other. , are joined by welding at the third hole 22 . Therefore, the cross member 20 made of steel and the floor-shaped portion 40 made of aluminum can be reliably joined by welding through the third hole 22 .
  • a C-shaped clamp is not required, and a through hole need not be provided in the floor-like portion 40, so that water can be prevented from entering the battery case 10.
  • the third hole 22 is filled with the aluminum weld metal WA, the cross member 20 made of steel and the floor-like portion 40 made of aluminum can be reliably joined by welding through the third hole 22. .
  • FIGS. 6A to 6D are diagrams for explaining a method of manufacturing the battery case 10 according to the first modification of the first embodiment.
  • the manufacturing method of the battery case 10 according to the first embodiment shown in FIGS. It was joined to the steel plate 30 by welding.
  • the cross member 20 and the steel plate 30 are joined by welding and integrated in advance, and then the steel plate 30 is attached to the first frame member 12. It may be joined to the side surface 12a by welding.
  • a method of manufacturing the battery case 10 of the first modified example will be specifically described below.
  • the aluminum MIG welding device 50 welds the first and second frame members 12 and 13 together to form the frame-shaped portion 11 . Further, the frame-shaped portion 11 is welded to the floor-shaped portion 40 by an aluminum MIG welding device 50, which is a common welding device.
  • the longitudinal ends of the cross member 20 are welded to the steel plate 30 by the steel MAG welding device 60. Thereby, the cross member 20 and the steel plate 30 are integrated.
  • the order of the welding process shown in FIG. 6(a) and the welding process shown in FIG. 6(b) is not particularly limited.
  • the steel plate 30 joined and integrated with the cross member 20 is abutted against the side surface 12a of the first frame member 12 on the floor portion 40 and positioned.
  • the aluminum MIG welding device 50 welds the flange portion 21 of the cross member 20 to the floor portion 40 .
  • the steel plate 30 is welded to the side surface 12 a of the first frame member 12 through the first hole 31 by the common aluminum MIG welding device 50 .
  • the battery case 10 is manufactured through such processes. Note that the order of each welding process may be changed as appropriate.
  • FIG. 7A to 7E are diagrams for explaining the manufacturing method of the battery case 10 according to the second embodiment.
  • a first rib 14 and a second rib 15 are provided on the upper and lower portions of the side surface 12a of the first frame member 12 in the height direction.
  • the first rib 14 and the second rib 15 are formed on the side surface 12a of the first frame member 12 so as to extend in the longitudinal direction of the first frame member 12 (upper right and lower left in the figure).
  • the first rib 14 has a first base portion 14a extending vertically from the side surface 12a toward the cross member 20, and a first projecting portion 14b projecting downward from the tip of the first base portion 14a.
  • a first groove portion 16 having an inverted U-shaped cross section is defined between the side surface 12a, the first base portion 14a, and the first projecting portion 14b.
  • the second rib 15 has a second base portion 15a extending vertically from the side surface 12a toward the cross member 20, and a second protruding portion 15b protruding upward from the tip of the second base portion 15a.
  • a second groove portion 17 having a U-shaped cross section is defined between the side surface 12a, the second base portion 15a, and the second projecting portion 15b.
  • first projecting portion 14b and the second projecting portion 15b face each other with a gap S therebetween, and the steel plate 30 and the cross member 20 can be joined through the gap S.
  • the steel plate 30 is inserted into the first groove portion 16 and the second groove portion 17 in the longitudinal direction of the first frame member 12 (upper right and lower left in the drawing). be.
  • the plurality of first holes 31 of the steel plate 30 are exposed to the inside of the frame-shaped portion 11 through the gaps S when the steel plate 30 is inserted into the first groove portion 16 and the second groove portion 17 .
  • the steel plate 30 is welded to the side surface 12 a of the first frame member 12 through the first hole 31 by the aluminum MIG welding device 50 .
  • first rib 14 and the second rib 15 are formed on the side surface 12a except for the ends in the longitudinal direction of the first frame member 12 (upper right and lower left in the figure).
  • stepped portions 12 b and 12 c are formed between the side surface 12 a and the first rib 14 and the second rib 15 .
  • Such stepped portions 12b and 12c are formed by providing the first rib 14 and the second rib 15 over the entire length of the side surface 12a and then notching the ends of the first rib 14 and the second rib 15.
  • the end surface of the second frame member 13 is in contact with the side surface 12a and the stepped portions 12b and 12c of the first frame member 12, and the end surface of the second frame member 13 is The first frame member 12 and the second frame member 13 are joined by line-welding the corner formed by the edge and the side surface 12 a of the first frame member 12 by the aluminum MIG welding device 50 .
  • the corners formed by the second rib 15 of the first frame member 12 and the lower surface of the second frame member 13 and the upper surface of the floor-like portion 40 are line-welded by the aluminum MIG welding device 50 .
  • a gap S ( 7A) As shown in FIG. 7(c), at the longitudinal end of the cross member 20, a gap S ( 7A), a convex portion 23 projecting toward the steel plate 30 is formed. Then, as shown in FIGS. 7(c) to (d), with the cross member 20 placed on the floor-like portion 40, the convex portion 23 is abutted against the steel plate 30 so as to fill the gap S. As shown in FIG. Here, the height dimension of the protrusion 23 of the cross member 20 is set larger than the gap S, and the protrusion 23 and the first and second protrusions 14b, 15b of the first and second ribs 14, 15 are , are preferably fitted and fixed. This improves the fixing force between the cross member 20 and the first frame member 12 .
  • the cross member 20 and the floor-like portion 40 are joined at the plurality of third holes 22 by the aluminum MIG welding device 50 by dissimilar material MIG spot welding.
  • the corner formed by the edge of the convex portion 23 of the cross member 20 and the steel plate 30 is line-welded by the steel MAG welding device 60 .
  • the battery case 10 is manufactured through such processes. Note that the order of each welding process may be changed as appropriate.
  • the steel plate 30 is inserted into the first groove portion 16 and the second groove portion 17 and arranged. Therefore, it is possible to prevent the steel plate 30 welded to the side surface 12a of the first frame member 12 from peeling off.
  • a projecting portion 23 projecting toward the steel plate 30 is formed. are joined by welding. Therefore, even when the first rib 14 and the second rib 15 are provided, the cross member 20 and the steel plate 30 can be joined by welding via the convex portion 23 .
  • FIGS. 8A to 8E are diagrams for explaining a method of manufacturing the battery case 10 according to the first modified example of the second embodiment.
  • the manufacturing method of the battery case 10 according to the second embodiment shown in FIGS. It was joined to the steel plate 30 by welding.
  • the cross member 20 and the steel plate 30 are joined by welding and integrated in advance, and then the steel plate 30 is attached to the first frame member 12. It may be joined to the side surface 12a by welding.
  • a method of manufacturing the battery case 10 of the first modified example will be specifically described below.
  • the convex portion 23 of the cross member 20 is welded to the steel plate 30 by the steel MAG welding device 60 . Thereby, the cross member 20 and the steel plate 30 are integrated. Then, as shown in FIG. 8B, the steel plate 30 joined and integrated with the cross member 20 is inserted into the first groove portion 16 and the second groove portion 17 .
  • the second frame member 13 is assembled with the end surface of the second frame member 13 butted against the side surface 12a and the stepped portions 12b and 12c of the first frame member 12.
  • a corner formed by the edge of the end face of 13 and the side surface 12 a of the first frame member 12 is line-welded by an aluminum MIG welding device 50 .
  • the aluminum MIG welding device 50 line-welds the corners formed by the second rib 15 of the first frame member 12 and the lower surface of the second frame member 13 and the upper surface of the floor-like portion 40 .
  • the aluminum MIG welding device 50 welds the flange portion 21 of the cross member 20 to the floor portion 40 through the third hole 22 . Also, the steel plate 30 is welded to the side surface 12 a of the first frame member 12 through the first hole 31 by the common aluminum MIG welding device 50 .
  • the battery case 10 is manufactured through such processes. Note that the order of each welding process may be changed as appropriate.
  • FIGS. 7A to 7E are diagrams for explaining a manufacturing method of the battery case 10 according to the second modified example of the second embodiment.
  • the longitudinal ends of the cross member 20 are provided with the first projecting portion 14b of the first rib 14 and the second rib 15.
  • a convex portion 23 projecting toward the steel plate 30 was formed between the second projecting portion 15b and the second projecting portion 15b.
  • the cross member 20 is not formed with the convex portion 23, and the steel plate 30 has a cross member A projection 32 projecting toward 20 is formed.
  • a method of manufacturing the battery case 10 of the second modified example will be specifically described below.
  • the protrusions 32 are formed between the first holes 31 formed six on each side in the width direction of the steel plate 30 , i.e., in the intermediate portion in the width direction of the steel plate 30 . .
  • the height of the protrusion 32 is approximately equal to or slightly smaller than the dimension of the gap S between the first protrusion 14b and the second protrusion 15b. Then, the steel plate 30 is inserted into the first groove portion 16 and the second groove portion 17 in the longitudinal direction of the first frame member 12 (upper right and lower left in the figure).
  • the plurality of first holes 31 of the steel plate 30 are exposed to the inside of the frame-shaped portion 11 through the gaps S when the steel plate 30 is inserted into the first groove portion 16 and the second groove portion 17 .
  • the contact surface of the protruding portion 32 of the steel plate 30 that contacts the cross member 20 is flush with the contact surfaces of the first protruding portion 14b and the second protruding portion 15b that contact the cross member 20 .
  • the aluminum MIG welding device 50 performs dissimilar material MIG spot welding of the steel plate 30 to the side surface 12a of the first frame member 12 through the first hole 31. Then, as shown in FIG. 9(b), the aluminum MIG welding device 50 performs dissimilar material MIG spot welding of the steel plate 30 to the side surface 12a of the first frame member 12 through the first hole 31. Then, as shown in FIG. 9(b), the aluminum MIG welding device 50 performs dissimilar material MIG spot welding of the steel plate 30 to the side surface 12a of the first frame member 12 through the first hole 31. Then, as shown in FIG.
  • the edge portion of the end surface of the second frame member 13 and the side surface of the first frame member 12 12 a is line welded by an aluminum MIG welding device 50 .
  • the corners formed by the second rib 15 of the first frame member 12 and the lower surface of the second frame member 13 and the upper surface of the floor-like portion 40 are line-welded by the aluminum MIG welding device 50 .
  • both end surfaces of the cross member 20 are contact surfaces of the projections 32 of the steel plate 30. and the contact surfaces of the first projecting portion 14b and the second projecting portion 15b. Then, the cross member 20 and the floor-like portion 40 are joined at the plurality of third holes 22 by the aluminum MIG welding device 50 by dissimilar material MIG spot welding.
  • the corners formed by the longitudinal ends of the cross member 20 and the projections 32 of the steel plate 30 are line-welded by the steel MAG welding device 60.
  • the battery case 10 is manufactured through such processes. Note that the order of each welding process may be changed as appropriate.
  • the steel plate 30 is formed with the projecting portion 32 projecting toward the cross member 20 between the first projecting portion 14b and the second projecting portion 15b. and one end of the cross member 20 are joined by welding. Therefore, even when the first rib 14 and the second rib 15 are provided, the cross member 20 and the steel plate 30 can be welded to each other via the projecting portion 32 .
  • the cross member 20 and the steel plate 30 are welded and integrated in advance, and then the steel plate 30 is are inserted into the first and second grooves 16 and 17, and the steel plate 30 is joined to the side surface 12a of the first frame member 12 by welding.
  • FIGS. 10A to 10G are diagrams for explaining a method of manufacturing the battery case 10 according to the third modification of the second embodiment.
  • the manufacturing method of this modified example as shown in FIGS. It differs from the second embodiment (see FIGS. 7A to 7E) in that it is fixed to the groove portion 16 and the second groove portion 17.
  • FIG. 7A to 7E the second embodiment in that it is fixed to the groove portion 16 and the second groove portion 17.
  • the steel plate 30 is inserted into the first groove portion 16 and the second groove portion 17, as shown in FIG. 10(a).
  • 10(b) and 10(c) show cross-sectional views of the first frame member 12 and the steel plate 30 before and after the first protrusion 14b and the second protrusion 15b are plastically deformed.
  • the thickness of the steel plate 30 is slightly smaller than the width of the first groove portion 16 and the second groove portion (the width between the side surface 12a and the first projecting portion 14b and the second projecting portion 15b). , to ensure smooth insertion of the steel plate 30 . Therefore, a gap H is generated between the steel plate 30 and the side surface 12a or the first projecting portion 14b and the second projecting portion 15b.
  • the one projecting portion 14b and the second projecting portion 15b are brought into contact with the steel plate 30 .
  • the steel plate 30 is sandwiched between the side surface 12 a of the first frame member 12 and the first projecting portion 14 b and the second projecting portion 15 b and fixed to the first groove portion 16 and the second groove portion 17 .
  • FIGS. 10(d) to 10(g) are the same as the steps described with reference to FIGS. 7(b) to (e), so description thereof will be omitted.
  • the steel plate 30 is formed into the first groove portion 16 and the second groove portion by the first projecting portion 14b and the second projecting portion 15b plastically deformed toward the steel plate 30. 17 , the steel plate 30 can be prevented from moving in the first groove portion 16 and the second groove portion 17 , and the steel plate 30 can be reliably fixed to the first frame member 12 .
  • the cross member 20 and the steel plate 30 are joined by welding and integrated in advance, and then the steel plate 30 is attached to the first frame member 12. may be joined to the side surface 12a of the by welding.
  • the second modified example see FIGS.
  • the cross member 20 is not formed with the protrusion 23, and the steel plate 30 is provided with the first protrusion 14b of the first rib 14 and the second protrusion 14b.
  • a projecting portion 32 projecting toward the cross member 20 may be formed between the second rib 15 and the second projecting portion 15b.
  • FIGS. 7A to 7E are diagrams for explaining a method of manufacturing the battery case 10 according to the sixth modification of the second embodiment.
  • the second hole 18 facing the steel plate 30 is formed in the first protruding portion 14b and the second protruding portion 15b, and the fastening member fastened toward the steel plate 30 through the second hole 18 It differs from the second embodiment (see FIGS. 7A to 7E) in that the steel plate 30 is fixed to the first groove portion 16 and the second groove portion 17 by means of the .
  • the second holes 18 are spaced apart in the longitudinal direction of the first frame member 12 (upper right and lower left in the figure) in the first projecting portion 14b and the second projecting portion 15b, respectively. Two each, eight in total. Although the number and positions of the second holes 18 are not particularly limited, the second holes 18 are positioned so as not to overlap the cross member 20 when the cross member 20 is joined to the steel plate 30 (see FIG. 11(g)). formed in In the illustrated example, it is arranged at a position vertically aligned with the first hole 31 of the steel plate 30 . Also, the second hole 18 is a screw hole formed with a female screw groove for screwing the bolt 71 .
  • the steel plate 30 is inserted into the first groove portion 16 and the second groove portion 17, as shown in FIG. 11(a).
  • 11(b) and 11(c) show cross-sectional views of the first frame member 12 and the steel plate 30 before and after the bolt 71 as a fastening member is fastened to the steel plate 30 through the second hole 18.
  • the thickness of the steel plate 30 is slightly smaller than the width of the first groove portion 16 and the second groove portion (the width between the side surface 12a and the first projecting portion 14b and the second projecting portion 15b). , to ensure smooth insertion of the steel plate 30 . Therefore, a gap H is generated between the steel plate 30 and the side surface 12a or the first projecting portion 14b and the second projecting portion 15b.
  • the bolt 71 is inserted into the second hole 18 and tightened toward the steel plate 30 as shown in FIG. 11(c). Thereby, the steel plate 30 is sandwiched between the side surface 12 a of the first frame member 12 and the bolt 71 and fixed to the first groove portion 16 and the second groove portion 17 .
  • the second hole 18 facing the steel plate 30 is formed in the first protruding portion 14b and the second protruding portion 15b. Since the steel plate 30 is fixed to the first groove portion 16 and the second groove portion 17 by the fastening member fastened toward the steel plate 30, the steel plate 30 can be prevented from moving in the first groove portion 16 and the second groove portion 17. 30 can be securely fixed to the first frame member 12 .
  • the cross member 20 and the steel plate 30 are joined by welding and integrated in advance, and then the steel plate 30 is attached to the first frame member 12. may be joined to the side surface 12a of the by welding. Further, unlike the second modified example (see FIGS.
  • the cross member 20 is not formed with the protrusion 23, and the steel plate 30 is provided with the first protrusion 14b of the first rib 14 and the second protrusion 14b.
  • a projecting portion 32 projecting toward the cross member 20 may be formed between the second rib 15 and the second projecting portion 15b.
  • (Fifth modification of the second embodiment) 12A to 12E are diagrams for explaining a method of manufacturing the battery case 10 according to the ninth modification of the second embodiment.
  • the second hole 18 facing the steel plate 30 is formed in the first protruding portion 14b and the second protruding portion 15b, and the first protruding portion 14b and the second protruding portion 15b and the steel plate 30 are connected to each other. It differs from the second embodiment (see FIGS. 7A to 7E) in that the steel plate 30 is fixed to the first groove portion 16 and the second groove portion 17 by joining by welding at the two holes 18. .
  • the second holes 18 are spaced apart in the longitudinal direction of the first frame member 12 (upper right and lower left in the figure) in the first projecting portion 14b and the second projecting portion 15b, respectively. Two each, eight in total. Although the number and positions of the second holes 18 are not particularly limited, the second holes 18 are positioned so as not to overlap the cross member 20 when the cross member 20 is joined to the steel plate 30 (see FIG. 12(e)). formed in In the illustrated example, it is arranged at a position vertically aligned with the first hole 31 of the steel plate 30 .
  • the steel plate 30 is inserted into the first groove portion 16 and the second groove portion 17, as shown in FIG. 12(a). Then, as shown in FIG. 12( b ), the aluminum MIG welding device 50 welds the steel plate 30 to the side surface 12 a of the first frame member 12 through the first hole 31 .
  • the edge portion of the end surface of the second frame member 13 and the side surface 12a of the first frame member 12 are aligned.
  • the first frame member 12 and the second frame member 13 are joined by line welding the corner formed by the aluminum MIG welding device 50 .
  • the corners formed by the second rib 15 of the first frame member 12 and the lower surface of the second frame member 13 and the upper surface of the floor-like portion 40 are line-welded by the aluminum MIG welding device 50 .
  • the convex portion 23 is positioned between the first projecting portion 14b and the second projecting portion 15b. is abutted against the steel plate 30 so as to fill the gap S of. Then, the flange portion 21 of the cross member 20 and the floor portion 40 are joined together at the plurality of third holes 22 by the aluminum MIG welding device 50 by dissimilar material MIG spot welding.
  • first projecting portion 14b and the second projecting portion 15b of the first frame member 12 and the steel plate 30 are joined by welding through the second holes 18, and the first frame member 12 is made of aluminum.
  • the steel plate 30 is made of steel, it is not preferable to apply normal arc welding. Therefore, in this modified example, the following arc spot welding for joining dissimilar materials is applied.
  • the auxiliary joining member 80 is inserted into the second hole 18 provided in the first protruding portion 14b and the second protruding portion 15b.
  • the auxiliary joining member 80 includes a hollow shaft-shaped insertion portion 81 that is inserted into the second hole 18, and a flange-shaped non-insertion portion that is arranged on the cross member 20 side surfaces of the first projecting portion 14b and the second projecting portion 15b. It has a stepped outer shape with a portion 83 .
  • a hollow portion 85 penetrating through the insertion portion 81 and the non-insertion portion 83 is formed in the joining auxiliary member 80 .
  • the outer shape of the non-insertion portion 83 is not limited to the circular shape shown in FIG. 12(e), and may be any shape.
  • the shape of the hollow portion 85 is not limited to a circular shape, and may be any shape.
  • the material of the auxiliary joining member 80 made of steel is not particularly limited as long as it is pure iron or an iron alloy, and examples thereof include mild steel, carbon steel, and stainless steel.
  • the hollow portion 85 of the auxiliary joining member 80 is filled with an iron alloy or Ni alloy weld metal in which the filler material (welding material) is melted by the dissimilar metal arc spot welding device 90 .
  • a melted portion is formed in the hollow portion 85 by the weld metal and the molten steel plate 30 and a part of the joining auxiliary member 80 .
  • the first protruding portion 14b and the second protruding portion 15b and the steel plate 30 are joined.
  • the second holes 18 are formed in the first protruding portion 14b and the second protruding portion 15b in advance, and then the auxiliary joining member 80 is inserted into the second holes 18.
  • the joining assisting member 80 itself as a punch
  • the upper pedestal on which the joining assisting member 80 is fixed is brought closer to the lower pedestal on which the first protruding portion 14b and the second protruding portion 15b are arranged, and punching is performed.
  • the step of providing the second holes 18 in the first protruding portion 14b and the second protruding portion 15b and the step of inserting the auxiliary joining member 80 into the second holes 18 may be performed at the same time.
  • the second hole 18 facing the steel plate 30 is formed in the first projecting portion 14b and the second projecting portion 15b, and the first projecting portion 14b and the second projecting portion 15b and the steel plate 30 are formed.
  • the cross member 20 and the steel plate 30 are joined by welding and integrated in advance, and then the steel plate 30 is attached to the first frame member 12. may be joined to the side surface 12a of the by welding.
  • the cross member 20 is not formed with the protrusion 23, and the steel plate 30 is provided with the first protrusion 14b of the first rib 14 and the second protrusion 14b.
  • a projecting portion 32 projecting toward the cross member 20 may be formed between the second projecting portion 15b of the second rib 15 and the second projecting portion 15b.
  • the steel plate 30 is welded to the side surface 12a of the first frame member 12 (the wall surface of the frame-shaped portion 11), and the steel plate 30 and one longitudinal end of the cross member 20 are welded together. spliced.
  • the battery case 1 is a relatively large-sized structure as an automobile part, and the dimensional accuracy of the aluminum extruded product, which is the material of the first frame member 12, is not necessarily high. Errors can result in large displacements. As a result, a gap is generated between the steel plate 30 joined to the side surface 12a of the first frame member 12 and the cross member 20, which may make welding impossible with a simple butt structure of the respective members.
  • the steel plate 30 joined to the side surface 12a of the first frame member 12 and the cross member 20 can flexibly cope with a gap that may occur at the butted portion, and the joint is lightweight and high.
  • a rigid battery case 1 and a method of manufacturing the battery case 1 will be described.
  • FIGS. 13(a) to 13(e) are diagrams for explaining the manufacturing method of the battery case 10 according to the third embodiment.
  • the length of the cross member 20 is designed to be shorter than the length between the pair of first protrusions 14b or the pair of second protrusions 15b that face each other in the longitudinal direction of the cross member 20.
  • a gap A is formed between the first projecting portion 14b and the second projecting portion 15b and the ends of the cross member 20 in the longitudinal direction.
  • a bracket portion 33 formed on the steel plate 30 is arranged in the gap A. As shown in FIG. The bracket portion 33 is joined to one end portion of the cross member 20 in the longitudinal direction, and the joining position to the cross member 20 can be adjusted. That is, the cross member 20 and the first frame member 12 are connected via the bracket portion 33 of the steel plate 30 .
  • the bracket portion 33 of the steel plate 30 is formed between the six first holes 31 formed on each side of the steel plate 30 in the width direction, that is, in the middle portion of the steel plate 30 in the width direction.
  • the bracket portion 33 has a flat plate shape extending perpendicularly to the side surface 12 a of the first frame member 12 .
  • the height of the bracket portion 33 is substantially equal to or slightly smaller than the dimension of the gap S between the first projecting portion 14b and the second projecting portion 15b.
  • FIGS. 13(a) and 13(b) in a state in which the steel plate 30 is inserted into the first groove portion 16 and the second groove portion 17, the bracket portion 33 is positioned from the first projecting portion 14b and the second projecting portion 15b. also protrudes to the cross member 20 side.
  • the cross member 20 has an inverted U-shaped cross section with an opening at the lower end, and also has openings at both ends in the longitudinal direction (horizontal direction in the figure).
  • a pair of flange portions 21 , 21 extending along the floor portion 40 are provided at the lower end portion of the cross member 20 in the height direction.
  • the cross member 20 includes an upper surface 26, a pair of side surfaces 24 extending downward from both widthwise ends of the upper surface 26, flange portions 21 extending vertically from the lower ends of the respective side surfaces 24, have
  • FIG. 14 is a cross-sectional view taken along line XIV-XIV in FIG. 13(e).
  • the bracket portion 33 is inserted into the cross member 20 so as to be longitudinally movable with respect to the cross member 20.
  • the bracket portion 33 has an outer surface 33 a that can abut against the inner surface of the cross member 20 and is relatively slidable inside the cross member 20 .
  • rectangular openings 25 that are elongated holes perpendicular to the longitudinal direction of the cross member 20 are formed at the ends of both side surfaces 24 of the cross member 20 . Therefore, when bracket portion 33 is arranged inside cross member 20 , outer surface 33 a of bracket portion 33 is exposed through opening 25 .
  • the outer surface 33a of the bracket portion facing from the opening 25 and the edge 25a of the opening 25 on the side of the first frame member 12 are line-welded by a steel MAG welding device 60 to join them.
  • the steel plate 30 is inserted into the first groove portion 16 and the second groove portion 17 in the longitudinal direction of the first frame member 12 (upper right and lower left directions in the drawing).
  • the side surface 12a of the first frame member 12 and the steel plate 30 are joined by dissimilar material MIG spot welding through the first hole 31 by the aluminum MIG welding device 50. be done. Also, the first frame member 12 and the second frame member 13 are joined by line welding by the aluminum MIG welding device 50 . Further, corners formed by the second rib 15 of the first frame member 12 and the lower surface of the second frame member 13 and the upper surface of the floor-like portion 40 are also joined by line welding by the aluminum MIG welding device 50 .
  • the cross member 20 is inserted toward the bracket portion 33 of the steel plate 30, and the cross member 20 is arranged at a desired position on the floor portion 40.
  • the flange portion 21 of the cross member 20 and the floor portion 40 are joined by dissimilar material MIG spot welding by an aluminum MIG welding device 50 through the third hole 22. be done.
  • the outer surface 33a of the bracket portion 33 facing from the opening 25 of the cross member 20 and the edge 25a of the opening 25 on the side of the first frame member 12 are made of steel.
  • a steel weld metal WS is formed by line welding by a MAG welding device 60 .
  • a weld bead is formed so as to block the opening 25, that is, to straddle the peripheral edge of the opening 25, and the opening 25 is formed. It may be filled and joined with steel weld metal WS. As a result, the resistance to the force acting in the longitudinal direction of the cross member 20 is further improved.
  • the dimension between the side surfaces 12a of the pair of first frame members 12 at the position where the cross member 20 is connected differs depending on the dimensional accuracy of the frame members 12.
  • the cross member 20 and the steel plate 30 joined to the side surface 12a of the frame member 12 can be reliably connected using the bracket portion 33, and the strength of the battery case 1 can be improved.
  • the end of the cross member 20 is formed with the opening 25 facing the outer surface 33a of the bracket portion 33 disposed therein, so that the bracket portion 33 and the cross member 20 are formed to face the outer surface 33a. Since the member 20 is joined by welding at the opening 25 , the bracket portion 33 and the cross member 20 can be welded together without the welding torch interfering with the first frame member 12 .
  • the first frame member 12 has the first and second ribs 14 and 15, but the first frame member 12 has the first and second ribs 14 and 15. It is applicable even if there is no Alternatively, the first and second ribs 14 and 15 may be plastically deformed toward the steel plate 30 as shown in FIGS. The first frame member 12 may be fastened or welded through the second holes 18 formed in the first and second ribs 14, 15 as shown in (b)-(c).
  • bracket portion 33 can be changed as appropriate.
  • (First modification of the third embodiment) 15(a) to (d) are diagrams for explaining a method of manufacturing the battery case 10 according to the first modification of the third embodiment.
  • the steel plate 30 and the bracket portion 33 are temporarily assembled by inserting the bracket portion 33 of the steel plate 30 into the cross member 20 .
  • the bracket portion 33 of the steel plate 30 attached to at least one end of the cross member 20 in this manner, the steel plate 30 is inserted into the first and second groove portions 16 and 17 .
  • the cross member 20 to which the bracket portion 33 is assembled is arranged with respect to the frame portion 11 .
  • the bracket portion 33 is loosely fitted to the cross member 20, and the bracket portion 33 and the cross member 20 can move forward and backward relative to each other.
  • the cross member 20 is moved while being guided by the bracket portion 33, and arranged at a desired position on the floor portion 40. Then, as shown in FIG. Then, the outer surface 33a of the bracket portion 33 facing from the opening 25 of the cross member 20 and the opening 25 are welded and joined by a steel MAG welding device.
  • first frame member 12 and the second frame member 13 are joined by line welding by an aluminum MIG welding device 50. Further, corners formed by the second rib 15 of the first frame member 12 and the lower surface of the second frame member 13 and the upper surface of the floor-like portion 40 are also joined by line welding by the aluminum MIG welding device 50 .
  • the flange portion 21 of the cross member 20 and the floor portion 40 are joined by dissimilar material MIG spot welding by the aluminum MIG welding device 50 through the third hole 22. be done. Also, the side surface 12 a of the first frame member 12 and the steel plate 30 are joined through the first hole 31 by performing dissimilar material MIG spot welding with an aluminum MIG welding device 50 .
  • (Second modification of the third embodiment) 16A to 16E are diagrams for explaining a method of manufacturing the battery case 10 according to the second modified example of the third embodiment.
  • the steel plate 30 has two bracket portions 33 formed between six first holes 31 formed on both sides in the width direction of the steel plate 30 .
  • the two bracket portions 33 are spaced apart from each other in the width direction of the steel plate, and each have a flat plate shape extending perpendicularly to the side surface 12 a of the first frame member 12 .
  • the two bracket portions 33 each have inner surfaces 33b facing each other in the width direction of the steel plate 30, and the cross member 20 is sandwiched between the inner surfaces 33b facing each other.
  • each bracket portion 33 is substantially equal to or slightly smaller than the dimension of the space S between the first projecting portion 14b and the second projecting portion 15b.
  • each bracket portion 33 protrudes toward the cross member 20 from the first projecting portion 14b and the second projecting portion 15b.
  • the side surface 12a of the first frame member 12 and the steel plate 30 are joined by dissimilar material MIG spot welding through the first hole 31 by the aluminum MIG welding device 50. be done. Also, the first frame member 12 and the second frame member 13 are joined by line welding by the aluminum MIG welding device 50 . Further, corners formed by the second rib 15 of the first frame member 12 and the lower surface of the second frame member 13 and the upper surface of the floor-like portion 40 are also joined by line welding by the aluminum MIG welding device 50 .
  • the cross member 20 is inserted between the inner surfaces 33b of the pair of bracket portions 33 of the steel plate 30, and the cross member 20 is arranged at a desired position on the floor portion 40.
  • the bracket portion 33 has an inner surface 33b that can come into contact with the pair of side surfaces (outer surfaces) 24 of the cross member 20, and can relatively slide on the pair of side surfaces (outer surfaces) 24 of the cross member 20. .
  • the flange portion 21 and the floor portion 40 of the cross member 20 are joined by dissimilar material MIG spot welding through the third hole 22 by the aluminum MIG welding device 50. be done.
  • FIG. 17 is a cross-sectional view taken along line XVII-XVII in FIG. 16(e).
  • the corner formed by the bracket portion 33 and the side surface 24 (outer surface) of the cross member 20 is line-welded by a steel MAG welding device 60 to form a steel weld metal WS. do.
  • the steel plate 30 and the cross member 20 are joined via the bracket portion 33 .
  • the dimension between the side surfaces 12a of the pair of first frame members 12 at the position where the cross member 20 is connected differs depending on the dimensional accuracy of the frame members 12.
  • the cross member 20 cannot be joined to the steel plate 30 joined to the side surface 12a of the frame member 12, for example.
  • the cross member 20 and the steel plate 30 joined to the side surface 12a of the frame member 12 can be reliably connected using the bracket portion 33, and the strength of the battery case 1 can be improved.
  • FIGS. 18(a) to 18(e) show modified examples of the steel plate 30.
  • the steel plate 30 may be composed of two steel plate pieces 30a divided in the width direction.
  • each steel plate piece 30 a has a plurality of first holes 31 and bracket portions 33 .
  • the cross member 20 is inserted between the bracket portions 33 of the pair of steel plate pieces 30a, and the respective bracket portions 33 and the side surfaces 24 of the cross member 20 are welded and joined.
  • FIGS. 19A to 19D are diagrams for explaining a method of manufacturing the battery case 10 according to the third modified example of the third embodiment.
  • the steel plate 30 and the bracket portion 33 are temporarily assembled by inserting the cross member 20 between the pair of bracket portions 33 of the steel plate 30 of the second modification.
  • the steel plate 30 is inserted into the first and second grooves 16 and 17 .
  • the cross member 20 is loosely fitted between the pair of bracket portions 33, and the cross member 20 and the pair of bracket portions 33 are movable forward and backward relative to each other.
  • the cross member 20 is moved while being guided by the pair of bracket portions 33, and arranged at a desired position on the floor portion 40. Then, as shown in FIG. A corner formed by the bracket portion 33 and the side surface 24 of the cross member 20 is welded and joined by a steel MAG welding device 60 .
  • first frame member 12 and the second frame member 13 are joined by line welding by an aluminum MIG welding device 50. Further, corners formed by the second rib 15 of the first frame member 12 and the lower surface of the second frame member 13 and the upper surface of the floor-like portion 40 are also joined by line welding by the aluminum MIG welding device 50 .
  • the flange portion 21 and the floor portion 40 of the cross member 20 are joined by dissimilar material MIG spot welding by an aluminum MIG welding device 50 through the third hole 22. be done. Also, the side surface 12 a of the first frame member 12 and the steel plate 30 are joined through the first hole 31 by performing dissimilar material MIG spot welding with an aluminum MIG welding device 50 .
  • the steel plate 30 made up of two steel plate pieces 30a shown in FIG. 18 can be applied.
  • FIGS. 20A to 20E are diagrams for explaining a manufacturing method of the battery case 10 according to the second modified example of the third embodiment.
  • the steel plate 30 has bracket portions 33 formed between six first holes 31 formed on each side in the width direction of the steel plate 30 .
  • the bracket portion 33 has an inverted U shape with an opening at its lower end.
  • the bracket portion 33 also has openings at both ends of the cross member 20 in the longitudinal direction.
  • the steel plate 30 is inserted into the first groove portion 16 and the second groove portion 17 in the longitudinal direction of the first frame member 12 (upper right and lower left in the figure).
  • the height of the bracket portion 33 is substantially equal to or slightly smaller than the dimension of the gap S between the first projecting portion 14b and the second projecting portion 15b.
  • the side surface 12a of the first frame member 12 and the steel plate 30 are joined by dissimilar material MIG spot welding through the first hole 31 by the aluminum MIG welding device 50. be done. Also, the first frame member 12 and the second frame member 13 are joined by line welding by the aluminum MIG welding device 50 . Further, corners formed by the second rib 15 of the first frame member 12 and the lower surface of the second frame member 13 and the upper surface of the floor-like portion 40 are also joined by line welding by the aluminum MIG welding device 50 .
  • the cross member 20 is inserted between the inner surfaces 33b of the pair of bracket portions 33 of the steel plate 30, and the cross member 20 is arranged at a desired position on the floor portion 40.
  • the bracket portion 33 has an inner surface 33b that can contact the pair of side surfaces (outer surfaces) 24 and the upper surface 26 of the cross member 20, and the pair of side surfaces (outer surfaces) 24 and the upper surface 26 of the cross member 20 are relatively It is slidable.
  • the flange portion 21 of the cross member 20 and the floor portion 40 are joined by dissimilar material MIG spot welding through the third hole 22 by the aluminum MIG welding device 50. be done.
  • the corners formed by the bracket portion 33 and the pair of side surfaces 24 of the cross member 20 are line-welded by a steel MAG welding device 60 to form a steel weld metal WS.
  • the steel plate 30 and the cross member 20 are joined via the bracket portion 33 .
  • FIGS. 20(a) to 20(e) are diagrams for explaining a method of manufacturing the battery case 10 according to the fifth modification of the third embodiment.
  • the cross member 20 is inserted into the bracket portion 33 of the steel plate 30 of the fourth modification (see FIGS. 20(a) to 20(e)), thereby and the bracket portion 33 are temporarily assembled, the steel plate 30 is inserted into the first and second groove portions 16 and 17 .
  • the cross member 20 is loosely fitted to the bracket portion 33, and the cross member 20 and the bracket portion 33 can move forward and backward relative to each other.
  • the cross member 20 is moved while being guided by the bracket portion 33, and arranged at a desired position on the floor portion 40.
  • a corner formed by the bracket portion 33 and the side surface 24 of the cross member 20 is welded and joined by a steel MAG welding device 60 .
  • first frame member 12 and the second frame member 13 are joined by line welding by an aluminum MIG welding device 50. Further, corners formed by the second rib 15 of the first frame member 12 and the lower surface of the second frame member 13 and the upper surface of the floor-like portion 40 are also joined by line welding by the aluminum MIG welding device 50 .
  • the flange portion 21 of the cross member 20 and the floor portion 40 are joined by dissimilar material MIG spot welding through the third hole 22 by the aluminum MIG welding device 50. be done. Also, the side surface 12 a of the first frame member 12 and the steel plate 30 are joined through the first hole 31 by performing dissimilar material MIG spot welding with an aluminum MIG welding device 50 .
  • FIGS. 16(a) to 16(e) are perspective views showing an example of the method of manufacturing the steel plate 30.
  • FIG. 29A and 29B are perspective views showing an example of the method of manufacturing the steel plate 30.
  • the ⁇ -shaped steel plate 30 shown in FIGS. 16(a) to 16(e) is provided on one surface of a single steel plate 36 as shown in FIGS. 29A and 29B. It is formed by vertically welding two steel plates 37 .
  • cutting from a plate, casting, 3D printing, roll rolling, machining such as cutting and drilling can be applied.
  • the steel plate 30 shown in FIGS. 13(a) to (e) and FIG. 30A may be deformed into similar shapes as shown in FIGS. 30B to 30G.
  • the modification of forming a chamfer at the orthogonal portions of the plates or the modification of forming a hollow may be appropriately performed as long as the object of the present application can be achieved.
  • FIGS. 22(a) to 22(e) are diagrams for explaining the manufacturing method of the battery case 10 according to the fourth embodiment.
  • the side surfaces 12a of the first frame members 12 are It is an object of the present invention to solve the problem that a cross member 20 cannot be joined to a steel plate 30 joined to a joint.
  • the steel plate 30 and the cross member 20 are connected using the bracket portion 33 formed on the steel plate 30.
  • Steel plate 30 and cross member 20 are connected by means of a steel wedge member 75 located at . A method for manufacturing the battery case 10 of this embodiment will be described below.
  • a projecting portion 32 is formed in the middle portion of the steel plate 30 in the width direction.
  • the protruding portions 32 are arranged between the first holes 31 formed six on each side in the width direction of the steel plate 30 .
  • the height of the protrusion 32 is approximately equal to or slightly smaller than the dimension of the gap S between the first protrusion 14b and the second protrusion 15b. Then, the steel plate 30 is inserted into the first groove portion 16 and the second groove portion 17 in the longitudinal direction of the first frame member 12 (upper right and lower left in the figure).
  • the plurality of first holes 31 of the steel plate 30 are exposed to the inside of the frame-shaped portion 11 through the gaps S when the steel plate 30 is inserted into the first groove portion 16 and the second groove portion 17 . Further, the contact surface of the protrusion 32 of the steel plate 30 that contacts the wedge member 75 is flush with the contact surfaces of the first protrusion 14b and the second protrusion 15b that contact the wedge member 75.
  • the aluminum MIG welding device 50 performs dissimilar material MIG spot welding of the steel plate 30 to the side surface 12 a of the first frame member 12 through the first hole 31 .
  • the edge portion of the end surface of the second frame member 13 and the side surface of the first frame member 12 12 a is line welded by an aluminum MIG welding device 50 .
  • the corners formed by the second rib 15 of the first frame member 12 and the lower surface of the second frame member 13 and the upper surface of the floor-like portion 40 are line-welded by the aluminum MIG welding device 50 .
  • one longitudinal end surface 27 of the cross member 20 is inclined with respect to the height direction of the steel plate 30.
  • the one end surface 27 of the cross member 20 is an inclined surface that is inclined such that the gap between the protruding portion 32 of the steel plate 30 and the projection portion 32 decreases from the upper surface 26 toward the floor-like portion 40 (from top to bottom).
  • the cross member 20 is placed on the floor portion 40 so that the one end surface 27 of the cross member 20 and the projecting portion 32 and the first and second projecting portions 14b, 15b of the steel plate 30 are separated from each other with a gap therebetween. placed.
  • a steel wedge-shaped member 75 is placed upward. inserted downward from the
  • the wedge-shaped member 75 has a shape corresponding to the member to be fitted.
  • the wedge-shaped member 75 of this embodiment includes a first side surface 75a that contacts the one end surface 27 of the cross member 20, a contact surface of the protrusion 32 of the steel plate 30, and contact surfaces of the first and second protrusions 14b and 15b. and a second side surface 75b that contacts the surface.
  • the first side surface 75a like the one end surface 27 of the cross member 20, is an inclined surface that inclines toward the steel plate 30 from above toward below.
  • the second side surface 75b has a planar shape like the contact surface of the protrusion 32 of the steel plate 30 and the contact surfaces of the first and second protrusions 14b and 15b.
  • the wedge-shaped member 75 has a wedge-shaped shape in which the width in the longitudinal direction of the cross member 20 decreases from the top to the bottom.
  • the wedge-shaped member 75 is provided with a plurality of through-holes 76 penetrating the wedge-shaped member 75 in the width direction (upper right and lower left in the figure) for weight reduction.
  • three through-holes 76 are provided, but the number is not particularly limited and may not be provided. That is, the wedge-shaped member 75 has a cross-sectional shape that is solid or has a space inside. According to this structure, if it is solid, the strength can be increased, and if a space is provided inside, the weight can be reduced.
  • the wedge-shaped member 75 is inserted downward from above between the one end surface 27 of the cross member 20 and the protrusion 32 and the first and second protrusions 14b and 15b of the steel plate 30.
  • the cross member 20 is thereby fixed between the pair of first frame members 12 .
  • the cross member 20 and the floor-like portion 40 are joined at the plurality of third holes 22 by the aluminum MIG welding device 50 by dissimilar material MIG spot welding.
  • FIG. 23 is a cross-sectional view taken along line XXIII-XXIII in FIG. 22(e).
  • the corner formed by the one end surface 27 of the cross member 20 and the first side surface 75a of the wedge-shaped member 75 is line-welded by the steel MAG welding device 60.
  • the corner formed by the second side surface 75b of the wedge-shaped member 75 and the protrusion 32 of the steel plate 30 is line-welded. Thereby, the steel plate 30 and the cross member 20 are strongly connected via the wedge-shaped member 75 .
  • the battery case 10 is manufactured through such processes. Note that the order of each welding process may be changed as appropriate.
  • the dimension between the side surfaces 12a of the pair of first frame members 12 at the position where the cross member 20 is connected differs depending on the dimensional accuracy of the frame members 12.
  • the cross member 20 and the steel plate 30 joined to the side surface 12a of the frame member 12 can be reliably connected using the wedge-shaped member 75, and the strength of the battery case 1 can be improved.
  • the wedge-shaped member 75 is solid or has a cross-sectional shape with a space inside, the strength can be increased if the wedge-shaped member 75 is solid, and the weight can be reduced if the space is provided inside.
  • FIGS. 24A to 24E are diagrams for explaining a manufacturing method of the battery case 10 according to the first modified example of the fourth embodiment.
  • the first and second ribs 14, 15 are provided on the first frame member 12, so that the steel plate 30 is provided with the protrusions 32. rice field.
  • the steel plate 30 need not be provided with the projecting portion 32 .
  • the steel plate 30 is welded to the side surface 12a of the first frame member 12 through the first hole 31 by the aluminum MIG welding device 50, as shown in FIGS. 24(a) and 24(b).
  • the corner formed by the edge of the end surface of the second frame member 13 and the side surface 12a of the first frame member 12 is line-welded by the aluminum MIG welding device 50. Further, the aluminum MIG welding device 50 line-welds the corners formed by the second rib 15 of the first frame member 12 and the lower surface of the second frame member 13 and the upper surface of the floor-like portion 40 .
  • the cross member 20 is arranged on the floor portion 40 so that the one end face 27 of the cross member 20 and the steel plate 30 are separated from each other with a gap therebetween.
  • a steel wedge-shaped member 75 is inserted downward from above. Thereby, the cross member 20 is fixed between the pair of first frame members 12 .
  • the cross member 20 and the floor-like portion 40 are joined at the plurality of third holes 22 by the aluminum MIG welding device 50 by dissimilar material MIG spot welding.
  • the steel MAG welding device 60 line-welds the corner formed by the one end surface 27 of the cross member 20 and the first side surface 75a of the wedge-shaped member 75, and A corner formed by the second side surface 75b of the wedge-shaped member 75 and the steel plate 30 is line-welded. Thereby, the steel plate 30 and the cross member 20 are strongly connected via the wedge-shaped member 75 .
  • the battery case 10 is manufactured through such processes. Note that the order of each welding process may be changed as appropriate.
  • FIG. 25(a) to (e) are diagrams for explaining a method of manufacturing the battery case 10 according to the second modification of the fourth embodiment.
  • a wedge-shaped member 75 made of steel is inserted downward between one end surface 27 of the cross member 20 and the steel plate 30 (FIG. 24). (c)).
  • the wedge-shaped member 75 is inserted between the one end surface 27 of the cross member 20 and the steel plate 30 in the width direction of the steel plate 30 (upper right and lower left in the drawing). may be placed.
  • one longitudinal end surface 27 of the cross member 20 is inclined with respect to the width direction of the steel plate 30, that is, the direction in which the side surface 12a of the first frame member 12 extends. That is, the one end surface 27 of the cross member 20 is an inclined surface that slopes so that the gap with the steel plate 30 decreases from one width direction side to the other width direction side (from upper right to lower left in the drawing).
  • the cross member 20 is arranged on the floor portion 40 so that the one end surface 27 of the cross member 20 and the steel plate 30 are separated from each other with a gap therebetween.
  • the wedge-shaped member 75 is inserted between the one end face 27 of the cross member 20 and the steel plate 30 from one side in the width direction of the steel plate 30 to the other side (from upper right to lower left in the figure).
  • the wedge-shaped member 75 has a shape corresponding to the member to be fitted.
  • the wedge-shaped member 75 of this modification has a first side surface 75 a that contacts the one end surface 27 of the cross member 20 and a second side surface 75 b that contacts the steel plate 30 .
  • the first side surface 75a like the one end surface 27 of the cross member 20, is an inclined surface that inclines toward the steel plate 30 from one side in the width direction of the steel plate 30 toward the other side (from upper right to lower left in the drawing).
  • the second side surface 75b has a planar shape like the steel plate 30 .
  • the wedge-shaped member 75 has a wedge-shaped shape in which the width in the longitudinal direction of the cross member 20 decreases from one widthwise side of the steel plate 30 to the other widthwise side (from upper right to lower left in the figure).
  • the wedge-shaped member 75 is positioned upward so as to enter the inner side in the width direction of the aluminum weld metal WA so as not to interfere with the excess metal of the aluminum weld metal WA embedded in the first holes 31 on both sides in the width direction of the steel plate 30. move downwards from Next, the wedge-shaped member 75 is inserted between the one end surface 27 of the cross member 20 and the steel plate 30 in the width direction of the steel plate 30 . Thereby, the cross member 20 is fixed between the pair of first frame members 12 .
  • the cross member 20 and the floor-like portion 40 are joined at the plurality of third holes 22 by the aluminum MIG welding device 50 by dissimilar material MIG spot welding.
  • the corner formed by the one end surface 27 of the cross member 20 and the first side surface 75a of the wedge-shaped member 75 is line-welded by the steel MAG welding device 60.
  • a corner formed by the second side surface 75b of the wedge-shaped member 75 and the steel plate 30 is line-welded. Thereby, the steel plate 30 and the cross member 20 are strongly connected via the wedge-shaped member 75 .
  • the battery case 10 is manufactured through such processes. Note that the order of each welding process may be changed as appropriate.
  • the wedge-shaped members 75 When the wedge-shaped members 75 are inserted between the longitudinal end surfaces of the cross member 20 and the steel plates 30, the wedge-shaped members 75 may be inserted in the same direction or in the opposite direction. .
  • FIGS. 26A to 26E are diagrams for explaining the manufacturing method of the battery case 10 according to the fifth embodiment.
  • this modification as in the third and fourth embodiments, even if the dimensions between the side surfaces 12a of the pair of first frame members 12 at the positions where the cross members 20 are connected are different, the first frame members 12 It is an object of the present invention to eliminate the problem that the cross member 20 cannot be connected to the side surface 12a of the .
  • steel plates 30 having different thicknesses are prepared in advance, and the steel plate 30 corresponding to the gap A between the first frame member 12 and the cross member 20 is selected. is placed. Then, the first frame member 12 and the cross member 20 are connected via the steel plate 30 .
  • a method for manufacturing the battery case 10 of this embodiment will be described below.
  • a first frame member 12 without first and second ribs 14, 15 is used.
  • the corner formed by the edge of the end surface of the second frame member 13 and the side surface 12a of the first frame member 12 is line-welded by the aluminum MIG welding device 50.
  • the corners formed by the lower surfaces of the first frame member 12 and the second frame member 13 and the upper surface of the floor-like portion 40 are also line-welded by the aluminum MIG welding device 50 .
  • the flange portion 21 of the cross member 20 and the floor portion 40 are joined by dissimilar material MIG spot welding by an aluminum MIG welding device 50 at the plurality of third holes 22 .
  • the length of the cross member 20 in the longitudinal direction is shorter than the length of the second frame member 13 in the longitudinal direction. A gap A is formed between them.
  • a plurality of steel plates 30 with different thicknesses are prepared in advance. Then, as shown in FIG. 26(d), a steel plate 30 having a thickness corresponding to the gap A between the side surface 12a of the first frame member 12 and the cross member 20 is selected, and the steel plate 30 is inserted into the gap A. to place. Then, the steel plate 30 is welded to the side surface 12 a of the first frame member 12 through the first hole 31 by the aluminum MIG welding device 50 .
  • the steel MAG welding device 60 line-welds the corner formed by one end of the cross member 20 and the steel plate 30 . Thereby, the first frame member 12 and the cross member 20 are connected via the steel plate 30 .
  • the battery case 10 is manufactured through such processes. Note that the order of each welding process may be changed as appropriate.
  • the dimension between the side surfaces 12a of the pair of first frame members 12 at the position where the cross member 20 is connected differs depending on the dimensional accuracy of the frame members 12.
  • the steel plate 30 having a thickness corresponding to the gap A between the side surface 12a of the first frame member 12 and the cross member 20 is selectively arranged, the cross member 20 can be attached to the side surface 12a of the first frame member 12. Problems such as not being able to connect can be resolved.
  • FIGS. 27A to 27E are diagrams for explaining a manufacturing method of the battery case 10 according to the modified example of the fifth embodiment.
  • a first frame member 12 having first and second ribs 14, 15 is used. Then, the steel plate 30 is inserted into the first groove portion 16 and the second groove portion 17 .
  • the corner formed by the edge of the end surface of the second frame member 13 and the side surface 12a of the first frame member 12 is line-welded by the aluminum MIG welding device 50.
  • the corners formed by the bottom surface of the second rib 15 and the second frame member 13 of the first frame member 12 and the top surface of the floor-like portion 40 are line-welded by the aluminum MIG welding device 50 .
  • the steel plate 30 is welded to the side surface 12 a of the first frame member 12 through the first hole 31 by the aluminum MIG welding device 50 .
  • flange portion 21 of the cross member 20 and the floor portion 40 are joined by dissimilar material MIG spot welding by an aluminum MIG welding device 50 at the plurality of third holes 22 .
  • a gap B is formed between both ends of the cross member 20 in the longitudinal direction and the steel plate 30 .
  • a plurality of steel plate members 35 with different thicknesses are prepared in advance. Then, as shown in FIG. 27(d), a plate-like member 35 having a thickness corresponding to the gap B between the cross member 20 and the steel plate 30 is selected, and the plate-like member 35 is arranged in the gap B. .
  • FIG. 28 shows a cross-sectional view taken along line XXVIII-XXVIII of FIG. 27(e).
  • a corner formed by one end of the cross member 20 and the plate-like member 35 is line-welded by the steel MAG welding device 60, and the plate-like member 35 is welded.
  • the corner formed with the steel plate 30 is line-welded. Thereby, the steel plate 30 and the cross member 20 are strongly connected via the plate member 35 .
  • the battery case 10 is manufactured through such processes. Note that the order of each welding process may be changed as appropriate.
  • the dimension between the side surfaces 12a of the pair of first frame members 12 at the position where the cross member 20 is connected differs depending on the dimensional accuracy of the frame members 12.
  • the plate member 35 having a thickness corresponding to the gap B between the steel plate 30 and the cross member 20 is selectively arranged, the cross member 20 cannot be connected to the side surface 12a of the first frame member 12. You can fix the problem.
  • the present invention is not limited to the above-described embodiments and modifications, and can be modified, improved, etc. as appropriate.
  • the first and second ribs 14 and 15 may be plastically deformed toward the steel plate 30 as shown in FIGS.
  • the first frame member 12 is inserted through the second holes 18 formed in the first and second ribs 14, 15. Fastening or welding may be performed.
  • the order of the welding steps in each embodiment and each modification is not limited to the one described above, and may be changed as appropriate.
  • the cross member is made of steel,
  • the frame-shaped portion is made of aluminum, while the cross member is made of steel, so that both weight reduction and cost reduction can be achieved.
  • the steel plate is welded to the wall surface of the frame-shaped portion and the cross member is further welded to the steel plate, the cross member can be firmly fixed to the frame-shaped portion via the steel plate.
  • the steel plate and the frame-shaped portion made of aluminum can be reliably joined by welding through the first hole.
  • the first rib has a first base portion extending from the wall surface toward the cross member and a first projection portion projecting downward from a tip of the first base portion, A first groove is defined between the wall surface, the first base and the first protrusion,
  • the second rib has a second base portion extending from the wall surface toward the cross member, and a second projection portion projecting upward from a tip of the second base portion, A second groove is defined between the wall surface, the second base and the second projection,
  • the battery case according to (1) wherein the steel plate is arranged in the first groove and the second groove. According to this configuration, it is possible to prevent the steel plate welded to the wall surface from coming off.
  • the steel plate has a projection projecting toward the cross member between the first projection and the second projection;
  • the battery case according to (2) wherein the projecting portion and the one longitudinal end portion of the cross member are joined by welding. According to this configuration, even when the first rib and the second rib are provided, the cross member and the steel plate can be joined by welding through the protrusion.
  • a bracket portion extending toward the cross member is formed on the steel plate; the bracket portion has an outer surface capable of coming into contact with the inner surface of the cross member and is relatively slidable inside the cross member;
  • the cross member is formed with an opening facing the outer surface of the bracket portion disposed therein,
  • a bracket portion extending toward the cross member is formed on the steel plate; the bracket portion has an inner surface capable of coming into contact with the outer surface of the cross member and is slidable relative to the outer surface of the cross member;
  • one end surface of the cross member in the longitudinal direction is inclined with respect to the height direction of the steel plate or the extending direction of the wall surface;
  • a steel wedge-shaped member is arranged between the one end surface of the cross member and the steel plate,
  • the battery case according to any one of (1) to (3), wherein the wedge-shaped member is welded to the cross member and the steel plate, respectively. According to this configuration, even if the dimension between the pair of wall surfaces at the position where the cross member is connected differs due to the dimensional accuracy of the frame-shaped portion, problems such as the cross member being unable to be joined to the steel plate joined to the wall surface. can be resolved.
  • the wedge-shaped member can be used to reliably connect the cross member and the steel plate joined to the wall surface, thereby improving the strength of the battery case.
  • the battery case according to any one of (1) to (7), wherein the cross member and the floor are joined by welding.
  • the frame-shaped portion and the floor-shaped portion are made of aluminum, while the cross member is made of steel, so that both weight reduction and cost reduction can be achieved.
  • the cross member and the floor are firmly joined by welding.
  • the cross member has a flange extending along the floor; A third hole facing the floor-like portion is formed in the flange portion, The flange portion and the floor portion are joined by welding at the third hole,
  • (10) a rectangular frame-shaped portion; at least one cross member extending toward a pair of parallel wall surfaces of the frame-shaped portion so as to partition the interior of the frame-shaped portion; with The frame-shaped portion is made of aluminum or an aluminum alloy,
  • the cross member is made of steel,
  • a method for manufacturing a battery case in which a steel plate is welded to the wall surface of the frame-shaped portion, The steel plate has a first hole facing the wall surface, , joining the steel plate and the wall surface by filling the first hole with aluminum or aluminum alloy weld metal;
  • the frame-shaped portion is made of aluminum, while the cross member is made of steel, so that both weight reduction and cost reduction can be achieved. Moreover, since the steel plate is welded to the wall surface of the frame-shaped portion and the cross member is further welded to the steel plate, the cross member can be firmly fixed to the frame-shaped portion via the steel plate.
  • a first rib and a second rib are provided on the top and bottom of the wall surface,
  • the first rib has a first base portion extending from the wall surface toward the cross member and a first projection portion projecting downward from a tip of the first base portion,
  • a first groove is defined between the wall surface, the first base and the first protrusion
  • the second rib has a second base portion extending from the wall surface toward the cross member, and a second projection portion projecting upward from a tip of the second base portion,
  • a second groove is defined between the wall surface, the second base and the second projection
  • a second hole facing the steel plate is formed in each of the first projecting portion and the second projecting portion;
  • the steel plate is fixed to the first groove and the second groove by joining the steel plate to the first protrusion and the second protrusion through the second hole by welding, according to (11).
  • a manufacturing method for a battery case According to this configuration, the steel plate can be prevented from moving in the first groove portion and the second groove portion, and the steel plate can be reliably fixed to the frame-shaped portion.
  • a bracket portion extending toward the cross member is formed on the steel plate; the bracket portion has an outer surface capable of coming into contact with the inner surface of the cross member and is relatively slidable inside the cross member;
  • the cross member is formed with an opening facing the outer surface of the bracket portion disposed therein,
  • a bracket portion extending toward the cross member is formed on the steel plate; the bracket portion has an inner surface capable of coming into contact with the outer surface of the cross member and is slidable relative to the outer surface of the cross member;
  • the bracket portion can be used to reliably connect the cross member and the steel plate joined to the wall surface, and the strength of the battery case can be improved.
  • one end surface of the cross member in the longitudinal direction is inclined with respect to the height direction of the steel plate or the extending direction of the wall surface;
  • a steel wedge-shaped member is arranged between the one end surface of the cross member and the steel plate,

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  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
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  • Battery Mounting, Suspending (AREA)

Abstract

Ce boîtier de batterie (10) est pourvu : d'une partie en forme de cadre rectangulaire (11) ; et d'au moins un élément transversal qui s'étend vers une paire de surfaces de paroi parallèles de la partie en forme de cadre (11) de façon à diviser l'intérieur de la partie en forme de cadre (11). La partie en forme de cadre (11) est constituée d'aluminium ou d'un alliage d'aluminium, l'élément transversal (20) est en acier, une plaque d'acier (30) est soudée à la surface de paroi de la partie en forme de cadre (11), la plaque d'acier (30) présente un premier trou (31) faisant face à la surface de paroi de la partie en forme de cadre (11), la plaque d'acier (30) et la surface de paroi de la partie en forme de cadre (11) sont assemblées par soudage dans le premier trou (31), le premier trou (31) est rempli d'un métal soudé WA d'aluminium ou d'un alliage d'aluminium, et la plaque d'acier (30) et une extrémité de l'élément transversal (20) dans la direction longitudinale sont jointes par soudage.
PCT/JP2022/031620 2021-08-31 2022-08-22 Boîtier de batterie et procédé de fabrication de boîtier de batterie WO2023032740A1 (fr)

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JPS52114446A (en) * 1976-03-22 1977-09-26 Fuji Heavy Ind Ltd Method of joining members of different materials
JP2013133044A (ja) * 2011-12-27 2013-07-08 Kobe Steel Ltd 車載用バッテリートレイおよび車載用バッテリーフレーム
JP2017070962A (ja) * 2015-10-05 2017-04-13 トヨタ紡織株式会社 異材接合継手及び溶接接合方法
JP2021023946A (ja) * 2019-07-31 2021-02-22 株式会社神戸製鋼所 電動車両用バッテリーケースおよびその製造方法
JP2021041783A (ja) * 2019-09-10 2021-03-18 株式会社神戸製鋼所 電動車両用バッテリーケース
CN210897393U (zh) * 2019-10-31 2020-06-30 威睿电动汽车技术(宁波)有限公司 一种电池包托盘及电池包

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