Welding jig and welding method

Abstract

The invention relates to the technical field of manufacturing of conductive connecting bars for new energy vehicles, and provides a welding jig and a welding method for solving the technical problems that an existing conductive connecting bar for a new energy vehicle is not accurate enough in welding, unstable, low in welding efficiency, time-consuming and poor in welding product consistency. The welding jig is used for welding a first copper bar, an aluminum bar and a third copper bar and comprises a tool base, and the tool base comprises a first step part, a second step part arranged on the first step part, a third step part arranged on the second step part, an abutting part arranged on the third step part and a flexible back cushion arranged on the abutting part. A first inserting groove is formed in the position, close to the second step part, of the first step part and used for receiving the first copper bar and the first vertical piece to be inserted and positioned, a pressing and buckling clamp is further arranged on the first step part and used for pressing the third copper bar on the first transverse piece for laser welding, and the flexible back cushion is used for abutting against the back of the aluminum bar.

Description

Technical Field

[0001] The present application relates to the technical field of manufacturing conductive connection bars for new energy vehicles, and in particular to a welding jig and a welding method. Background Art

[0002] In the manufacturing process of conductive connecting bars for new energy vehicles, there are usually two conventional methods, the first is laser welding and the second is riveting.

[0003] Laser welding requires multiple sets of tooling and fixing devices, manual clamping is slow, production capacity is low, cost is high, dimensional accuracy is not high, product consistency is poor, and laser welding can easily damage the surface treatment of the product and affect product performance.

[0004] The riveting assembly requires aligning the two copper bars, inserting the rivets, and then punching and riveting. As the product is small, the assembly operation is difficult and time-consuming, and there is a risk of rivets falling off due to the impact of the environment during use after assembly. Summary of the invention

[0005] The present application provides a welding jig and a welding method, which are used to solve the technical problem of low welding dimensional accuracy of conductive connection bars for new energy vehicles in the background technology.

[0006] In order to solve the above technical problems, a technical solution adopted in the present application is: to provide a welding jig, the welding jig is used to weld the first copper bar, the aluminum bar, and the third copper bar, the first copper bar includes a first vertical piece, a first horizontal piece integrally connected to the top of the first vertical piece, a second vertical piece integrally connected to the side of the first horizontal piece, a second horizontal piece integrally connected to the top of the second vertical piece, and a third vertical piece integrally connected to the side of the second horizontal piece, the second horizontal piece is connected to the end of the aluminum bar by ultrasonic welding, the third copper bar is connected to the surface of the first horizontal piece by laser welding, and the welding jig The tooling base includes a first step portion, a second step portion arranged on the first step portion, a third step portion arranged on the second step portion, a supporting portion arranged on the third step portion, and a flexible cushion arranged on the supporting portion. The first step portion is provided with a first slot adjacent to the second step portion, the first slot is used to receive the first vertical sheet for insertion and positioning, the first step portion is further provided with a buckle clip, the buckle clip is used to press the first horizontal sheet and press the third copper bar onto the first horizontal sheet for laser welding, and the flexible cushion is used to abut against the back of the aluminum bar.

[0007] Preferably, the buckle clamp is provided with a through slot, and the portion to be welded between the third copper bar and the first transverse sheet is exposed through the through slot, the through slot is in an inverted cone shape, and the opening diameter at the top of the through slot is larger than the opening diameter at the bottom of the through slot.

[0008] Preferably, an L-shaped stopper is provided on the second step portion, and the L-shaped stopper is used to position adjacent side edges of the first transverse piece.

[0009] Preferably, two positioning blocks are provided on the upper surface of the L-shaped stopper, and a first positioning groove is formed between the two positioning blocks. The middle area of ​​the third copper busbar is positioned by the first positioning groove, and the bottom front end of the press buckle clamp is provided with a step portion that cooperates with the steps of the two positioning blocks, and the press buckle clamp further presses the third copper busbar on the two positioning blocks.

[0010] Preferably, the second step portion is further provided with a second positioning groove aligned with the first positioning groove, the second positioning groove includes a first width portion and a second width portion, the width of the first width portion is greater than the width of the second width portion to form a closing groove shape, and the second positioning groove is used to position the free end of the third copper busbar.

[0011] Preferably, a strip stopper is further provided on the third step portion, and the strip stopper is vertically connected to the bottom of the abutting portion and is used for positioning the side of the second transverse piece away from the third vertical piece.

[0012] Preferably, a boss is further provided on the third step portion, and a positioning recess matched with the boss is provided at the bottom of the second transverse piece.

[0013] Preferably, the thickness of the first step portion is greater than the thickness of the second step portion and the third step portion, and the first slot passes through to the bottom of the first step portion.

[0014] In order to solve the above technical problems, another technical solution adopted by the present application is: to provide a method for welding based on the above welding jig, comprising the following steps: Integrally punching a first positioning riveting column on the first transverse piece; A first alignment hole is provided on the third copper busbar corresponding to the first positioning rivet column; Insert the first vertical piece into the first slot in an aligned manner, so that the first horizontal piece and the second horizontal piece are respectively placed on the second step portion and the third step portion and are respectively positioned by the L-shaped stopper and the strip stopper; Sleeve the first alignment hole of the third copper bar with the first positioning rivet column of the first transverse piece, and position the third copper bar through the first positioning groove and the second positioning groove; Riveting and connecting the first positioning riveting column and the first alignment hole; Using the buckle clamp to press the first copper bar and the third copper bar; The third copper bar is laser welded to the first transverse sheet.

[0015] Preferably, positioning holes are provided at both ends of the aluminum bar; Arrange an alignment post on the second transverse piece; The alignment posts of the second transverse piece are matched and butted with the alignment holes of the aluminum row and then ultrasonically welded.

[0016] The beneficial effects of the present application are as follows: different from the prior art, the welding jig provided by the present application is provided with a first step portion, a second step portion, and a third step portion corresponding to the structure of the first copper bar, and is provided with a supporting portion and a flexible cushion corresponding to the aluminum bar, and is provided with a buckle clip with a through groove, which can ensure that the position is stable during laser welding and is not easy to damage the surface treatment of the product. The overall assembly is convenient, the positioning is accurate, the welding is reliable, and the product consistency is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them: Figure 1 It is a schematic diagram of the three-dimensional structure of the conductive connecting bar for new energy vehicles to be welded; Figure 2 It is a schematic diagram of the three-dimensional structure of the welding jig provided in an embodiment of the present application; Figure 3 It is a schematic diagram of the exploded structure of the welding fixture provided in the embodiment of the present application.

[0018] Explanation of the reference numerals: 110, first copper bar; 100, aluminum bar; 111, first vertical sheet; 113, first horizontal sheet; 114, first positioning rivet column; 115, second vertical sheet; 117, second horizontal sheet; 118, positioning recess; 119, third vertical sheet; 120, second copper bar; 122, welding sheet; 124, extension sheet; 130, third copper bar; 131, first alignment hole; 210, first step portion; 211, first slot; 220, second step portion; 221, first positioning groove; 222, L-shaped stopper; 224, positioning block; 225, second positioning groove; 226, strip stopper; 230, third step portion; 231, boss; 240, abutment portion; 242, flexible cushion; 250, buckle clip; 252, through groove; 254, step portion. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back...), such directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0021] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0022] The embodiment of the present application provides a welding jig, which is used for auxiliary welding of the first copper bar 110, the aluminum bar 100, and the third copper bar 130. Among them, the second copper bar 120 can be pre-welded with the aluminum bar 100 by ultrasonic welding.

[0023] like Figure 1 As shown, the first copper bar 110 includes a first vertical piece 111, a first horizontal piece 113 integrally connected to the top of the first vertical piece 111, a second vertical piece 115 integrally connected to the side of the first horizontal piece 113, a second horizontal piece 117 integrally connected to the top of the second vertical piece 115, and a third vertical piece 119 integrally connected to the side of the second horizontal piece 117.

[0024] The first vertical piece 111 and the third vertical piece 119 are substantially located in the same plane, and the second vertical piece 115 is substantially perpendicular to the first vertical piece 111 and the third vertical piece 119. The first horizontal piece 113 and the second horizontal piece 117 are substantially parallel.

[0025] Two first positioning rivet columns 114 with smaller diameters are disposed on the first transverse piece 113 . The width of the third copper bar 130 is relatively small. Two first alignment holes 131 matching the first positioning rivet columns 114 are disposed in the length direction of the third copper bar 130 .

[0026] The surface of the second transverse piece 117 is provided with an alignment post 116 , and the bottom surface of the second transverse piece 117 is provided with a positioning recess 118 .

[0027] The second copper busbar 120 includes a welding piece 122 and an extension piece 124 bent and connected to the welding piece 122 . The welding piece 122 is also provided with a structure identical to the alignment post 116 . Accordingly, both ends of the aluminum busbar 100 are provided with positioning holes matching the alignment post 116 .

[0028] The second transverse piece 117 and the welding piece 122 are connected to both ends of the aluminum bar 100 by ultrasonic welding, and the third copper bar 130 is connected to the surface of the first transverse piece 113 by laser welding. It is worth mentioning that the high-frequency vibration frequency generated during ultrasonic welding is relatively high. If the second transverse piece 117 and the welding piece 122 are not provided with positioning posts 116 and the two ends of the aluminum bar 100 are not provided with matching positioning holes, welding deviation is very likely to occur during ultrasonic welding, and the consistency of the product is poor.

[0029] like Figure 2 and Figure 3 As shown, the welding fixture includes a tooling base, which includes a first step portion 210, a second step portion 220 disposed on the first step portion 210, a third step portion 230 disposed on the second step portion 220, a supporting portion 240 disposed on the third step portion 230, and a flexible cushion 242 disposed on the supporting portion 240. The flexible cushion 242 can be made of a flexible material such as silica gel, and can elastically rest on the back of the aluminum bar 100, play a certain elastic buffering and shock absorbing role, and can also absorb the impact of part tolerance.

[0030] A first slot 211 is provided at the first step portion 210 adjacent to the second step portion 220. The first slot 211 may be a through slot or a blind slot. The first slot 211 is used to receive the first vertical piece 111 for insertion and positioning. A snap clip 250 is further provided on the first step portion 210. The snap clip 250 is used to press the first transverse piece 113 and press the third copper bus 130 onto the first transverse piece 113 for laser welding.

[0031] The buckle clamp 250 is provided with a through slot 252, and the part to be welded between the third copper busbar 130 and the first transverse piece 113 is exposed through the through slot 252 for convenient riveting operation and laser welding. The through slot 252 is in an inverted cone shape, and the opening diameter at the top of the through slot 252 is larger than the opening diameter at the bottom of the through slot 252.

[0032] Furthermore, an L-shaped stopper 222 is provided on the second step portion 220, and the L-shaped stopper 222 is used to position the adjacent sides of the first transverse piece 113, that is, to position the first transverse piece 113 in the X direction and the Y direction. When the buckle clip 250 is working, it positions the first transverse piece 113 in the Z direction. Through three-dimensional positioning, the consistency of the product can be improved.

[0033] like Figure 3 As shown, the upper surface of the L-shaped stopper 222 is further provided with two positioning blocks 224, and a first positioning groove 221 is formed between the two positioning blocks 224. The middle area of ​​the third copper busbar 130 is positioned by the first positioning groove 221, and the bottom of the pressing clip 250 is provided with a step portion 254 that cooperates with the steps of the two positioning blocks 224. The pressing clip 250 further presses the third copper busbar 130 above the two positioning blocks 224.

[0034] The second step portion 220 is further provided with a second positioning groove 225 aligned with the first positioning groove 221. The horizontal height position of the second positioning groove 225 is lower than the horizontal height position of the first positioning groove 221. The second positioning groove 225 includes a first width portion and a second width portion. The width of the first width portion is greater than the width of the second width portion to form a closing groove shape matching the shape of the third copper busbar 130. The second positioning groove 225 is used to position the free end of the third copper busbar 130.

[0035] The third step portion 230 is further provided with a strip stopper 226 which is vertically connected to the bottom of the abutment portion 240 and is used to position the second transverse piece 117 away from the third vertical piece 119, that is, to position the second transverse piece 117 in the X direction and the Y direction.

[0036] A boss 231 is further provided on the third step portion 230 , and correspondingly, a positioning recess 118 matching and engaging with the boss 231 is provided at the bottom of the second transverse piece 117 .

[0037] The thickness of the first step portion 210 is greater than the thickness of the second step portion 220 and the third step portion 230 , and the first slot 211 penetrates to the bottom of the first step portion 210 .

[0038] The present application also provides a welding method, which is performed based on the aforementioned welding jig, and the welding method comprises the following steps: A first positioning rivet column 114 is integrally punched on the first transverse piece 113; A first alignment hole 131 is provided on the third copper busbar 130 corresponding to the first positioning rivet column 114; Insert the first vertical piece 111 into the first slot 211 so that the first horizontal piece 113 and the second horizontal piece 117 are respectively placed on the second step portion 220 and the third step portion 230 and are positioned by the L-shaped stopper 222 and the strip stopper 226; The first alignment hole 131 of the third copper bar 130 is sleeved with the first positioning rivet column 114 of the first transverse piece 113 and the third copper bar 130 is positioned through the first positioning groove 221 and the second positioning groove 225; Rivet the first positioning riveting column 114 and the first alignment hole 131 together; Using the pressing clip 250 to press the first copper bar 110 and the third copper bar 130; The third copper busbar 130 and the first transverse sheet 113 are laser welded.

[0039] The riveting connection between the first positioning rivet column 114 and the first alignment hole 131 may be performed before or after the first copper bar 110 and the third copper bar 130 are compressed by the compression clamp 250 .

[0040] The method provided in this application also includes: Positioning holes are provided at both ends of the aluminum bar 100; Alignment posts 116 are respectively provided on the second transverse piece 117 and the welding piece 122; The alignment holes of the alignment posts 116 of the second transverse piece 117 and the welding piece 122 and the aluminum bar 100 are matched and butt-jointed, and then ultrasonic welding is performed.

[0041] In summary, those skilled in the art can easily understand that the welding jig provided in the present application is provided with a first step portion 210, a second step portion 220, and a third step portion 230 corresponding to the structure of the first copper busbar 110, and is provided with a supporting portion 240 and a flexible cushion 242 corresponding to the aluminum busbar 100, and is provided with a buckle clip 250 with a through groove 252, which can ensure that the position is stable during laser welding and the surface treatment of the product is not easily damaged. The overall assembly is convenient, the positioning is accurate, the welding is reliable, and the product consistency is good.

[0042] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A welding jig, characterized in that: The welding jig is used for auxiliary welding of a first copper bar (110), an aluminum bar (100), and a third copper bar (130); the first copper bar (110) comprises a first vertical piece (111), a first horizontal piece (113) integrally connected to the top of the first vertical piece (111), a second vertical piece (115) integrally connected to the side of the first horizontal piece (113), a second horizontal piece (117) integrally connected to the top of the second vertical piece (115), and a third vertical piece (119) integrally connected to the side of the second horizontal piece (117); the second horizontal piece (117) is connected to the end of the aluminum bar (100) by ultrasonic welding; the third copper bar (130) is connected to the surface of the first horizontal piece (113) by laser welding; the welding jig comprises a tooling base, the tooling base comprises a first step portion (210), a A second step portion (220) on the first step portion (210), a third step portion (230) arranged on the second step portion (220), a supporting portion (240) arranged on the third step portion (230), and a flexible cushion (242) arranged on the supporting portion (240); a first slot (211) is arranged on the first step portion (210) adjacent to the second step portion (220); the first slot (211) is used to receive the first vertical sheet (111) for insertion and positioning; a buckle clip (250) is further arranged on the first step portion (210); the buckle clip (250) is used to press the first horizontal sheet (113) and press the third copper bar (130) onto the first horizontal sheet (113) for laser welding; and the flexible cushion (242) is used to abut against the back of the aluminum bar (100).

2. The welding jig according to claim 1, characterized in that: The buckle clamp (250) is provided with a through slot (252), and the portion of the third copper bar (130) pressed against the first transverse sheet (113) to be welded is exposed through the through slot (252), the through slot (252) is in an inverted cone shape, and the opening diameter of the top of the through slot (252) is larger than the opening diameter of the bottom of the through slot (252).

3. The welding jig according to claim 2, characterized in that: An L-shaped stopper (222) is provided on the second step portion (220), and the L-shaped stopper (222) is used to position the adjacent side edges of the first transverse piece (113).

4. The welding jig according to claim 3, characterized in that: Two positioning blocks (224) are provided on the upper surface of the L-shaped stopper (222); a first positioning groove (221) is formed between the two positioning blocks (224); a middle area of ​​the third copper busbar (130) is positioned via the first positioning groove (221); a step portion (254) is provided at the front end of the bottom of the pressing clip (250) to match the steps of the two positioning blocks (224); the pressing clip (250) further presses the third copper busbar (130) onto the two positioning blocks (224).

5. The welding jig according to claim 4, characterized in that: The second step portion (220) is further provided with a second positioning groove (225) aligned with the first positioning groove (221), the second positioning groove (225) comprising a first width portion and a second width portion, the width of the first width portion being greater than the width of the second width portion to form a closed groove shape, and the second positioning groove (225) is used to position the free end of the third copper busbar (130).

6. The welding jig according to claim 5, characterized in that: The third step portion (230) is further provided with a strip-shaped stopper (226), which is vertically connected to the bottom of the abutment portion (240) and is used to position the side of the second transverse piece (117) away from the third vertical piece (119).

7. The welding jig according to claim 6, characterized in that: The third step portion (230) is further provided with a boss (231), and the bottom of the second transverse piece (117) is provided with a positioning recess (118) that matches and engages with the boss (231).

8. The welding jig according to claim 7, characterized in that: The thickness of the first step portion (210) is greater than the thickness of the second step portion (220) and the third step portion (230), and the first slot (211) penetrates to the bottom of the first step portion (210).

9. A welding method, characterized in that: The welding method is performed based on the welding jig according to claim 8, and the welding method comprises the following steps: Integrally punching a first positioning riveting column (114) on the first transverse piece (113); A first alignment hole (131) is provided on the third copper bar (130) corresponding to the first positioning riveting column (114); Inserting the first vertical piece (111) into the first slot (211) in an aligned manner, so that the first horizontal piece (113) and the second horizontal piece (117) are respectively placed on the second step portion (220) and the third step portion (230) and are respectively positioned by the L-shaped stopper (222) and the strip-shaped stopper (226); The first alignment hole (131) of the third copper bar (130) is sleeved with the first positioning rivet column (114) of the first transverse piece (113), and the third copper bar (130) is positioned through the first positioning groove (221) and the second positioning groove (225); Riveting and connecting the first positioning riveting column (114) and the first alignment hole (131); Using the pressing clip (250) to press the first copper bar (110) and the third copper bar (130); The third copper bar (130) and the first transverse sheet (113) are laser welded.

10. The method according to claim 9, characterized in that The method further comprises: Positioning holes are provided at both ends of the aluminum bar (100); An alignment post (116) is provided on the second transverse piece (117); The alignment posts (116) of the second transverse piece (117) are matched and butted with the alignment holes of the aluminum bar (100), and then ultrasonically welded.

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