Busbar aluminum bar structure and magnetic pulse welding method for busbar aluminum bar and FPC

Abstract

The invention belongs to the technical field of magnetic pulse welding, and particularly relates to a busbar aluminum bar structure and a magnetic pulse welding method of a busbar aluminum bar and an FPC, the busbar aluminum bar structure comprises an aluminum bar main body and a to-be-welded part used for carrying out magnetic pulse welding with the FPC, the to-be-welded part is integrally arranged at one end of the aluminum bar main body, and the to-be-welded part is arranged in a downward concave shape relative to the aluminum bar main body; the upper surface of the to-be-welded part is lower than the upper surface of the aluminum bar body, the lower surface of the to-be-welded part is lower than the lower surface of the aluminum bar body, the width of the to-be-welded part is larger than or equal to the width of the end, used for welding, of the FPC, and the end, used for welding, of the FPC is located above the upper surface of the to-be-welded part during magnetic pulse welding. During welding, the controllability of the to-be-welded part is higher, the overall surface of the welded busbar aluminum bar is smoother, the welding effect is more stable, and the welding quality is better.

Description

Technical Field

[0001] The present invention belongs to the technical field of magnetic pulse welding, and in particular relates to a busbar aluminum bar structure and a magnetic pulse welding method for the busbar aluminum bar and an FPC. Background Art

[0002] Electric vehicle power batteries are often made up of several battery modules connected in series and in parallel. The connection and control of each battery module, temperature monitoring and other functions are key factors in the safe operation of the power battery. These functions are usually completed by CCS (integrated busbar) composed of FPC, busbar, etc. The current mainstream welding methods are pulse hot pressing welding, laser welding, ultrasonic welding and reflow soldering, but the above welding methods all require the provision of solder and other filler solders during the welding process. Through laser welding or hot pressing pulse welding, the solder paste (solder wire) is heated and melted to form a weld with the parent material. This process often leads to cold welding, false welding, thermal cracking and other phenomena. When applied to the welding of FPC materials and busbar aluminum bars, it is easy to affect the conductivity of the FPC material after welding, and the use of solder filling itself will affect the strength of the welded joints. In addition, the temperature of laser welding and other methods is high during the welding process, which is easy to cause high temperature burns to the FPC material.

[0003] As a new type of solid-phase welding process, magnetic pulse has more advantages in the field of dissimilar metal welding. Its basic principle is to generate electromagnetic force between the coil and the workpiece through high-frequency pulse current, driving the workpiece to undergo plastic deformation under high-speed collision to achieve the welding effect. However, FPC is often thinner, and its single-layer material is often less than 50μm, of which the copper foil thickness is about 18μm. It is difficult to accurately control the welding speed when using FPC as a flying plate. Too high a welding speed may cause damage to the FPC material, and too low a welding speed will affect the welding results. When using busbar aluminum bars as flying plates, there will be problems such as difficulty in controlling the welding area, and large deformation of the welding area and other areas. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a busbar aluminum bar structure and a magnetic pulse welding method for a busbar aluminum bar and an FPC, which has higher controllability of the welded parts during welding, a smoother overall surface of the busbar aluminum bar after welding, a more stable welding effect and better welding quality.

[0005] The present invention provides a busbar aluminum bar structure, comprising an aluminum bar main body and a portion to be welded for magnetic pulse welding with an FPC, wherein the portion to be welded is integrally arranged at one end of the aluminum bar main body, and the portion to be welded is concave relative to the aluminum bar main body, the upper surface of the portion to be welded is lower than the upper surface of the aluminum bar main body, and the lower surface is lower than the lower surface of the aluminum bar main body, and the width of the portion to be welded is greater than or equal to the width of one end of the FPC for welding. When magnetic pulse welding is performed, the end of the FPC for welding is located above the upper surface of the portion to be welded.

[0006] Furthermore, the portion to be welded includes an inclined section and a plane section, and the inclined section and the plane section are arranged along the length direction of the portion to be welded. The plane section is parallel to the aluminum bar main body and is integrally connected to the lower end of the inclined section, and the higher end of the inclined section is integrally connected to one end of the aluminum bar main body, so that the portion to be welded is integrally arranged at one end of the aluminum bar main body.

[0007] Furthermore, when magnetic pulse welding is performed, the junction between the inclined section and the plane section is located in the middle of the welding area.

[0008] Furthermore, the inclination angle α of the inclined section relative to the aluminum bar body is 4.5°~8.5°.

[0009] Furthermore, the horizontal length of the inclined section is 8 mm to 11 mm, and the length of the plane section is 10 mm to 15 mm.

[0010] Furthermore, a notch is provided at one end of the aluminum bar body, the portion to be welded is located in the notch, the high end of the inclined section is integrally connected to one side of the notch, and the end of the plane section away from the inclined section is arranged in a direction away from the aluminum bar body.

[0011] Furthermore, the portion to be welded is extended at one end of the aluminum bar body in a direction away from the aluminum bar body.

[0012] Furthermore, one end of the aluminum bar body is recessed downward along the upper surface and convex downward along the lower surface to form the portion to be welded.

[0013] Furthermore, the width of the portion to be welded is less than or equal to twice the width of one end of the FPC for welding.

[0014] The present invention also provides a method for magnetic pulse welding of a busbar aluminum bar and an FPC, wherein the busbar aluminum bar uses the above-mentioned busbar aluminum bar structure, and the method comprises the following steps: S1. Peel off the outer insulation layer of the end of the FPC used for soldering to expose the copper foil layer; S2, make one end of the FPC for welding be located above the upper surface of the part to be welded, so that the area where the copper foil layer is exposed overlaps with the part to be welded in the welding direction, and keep the end of the FPC and the part to be welded spaced in the welding direction; S3. Perform magnetic pulse welding.

[0015] The beneficial effect of the present invention is that the part to be welded on the busbar aluminum bar forms an independent module on the aluminum bar body, which is independent of the aluminum bar body, and has higher controllability during welding. While ensuring welding accessibility, the influence of electromagnetic force on other areas on the busbar aluminum bar is minimized as much as possible. During the welding process, the aluminum bar body of the busbar aluminum bar is not affected by deformation, and the part to be welded is deformed by the upward action of the electromagnetic force, and finally becomes coplanar with the aluminum bar body. When applied to the magnetic pulse welding of the busbar aluminum bar and the FPC, on the basis of realizing the welding method of the busbar aluminum bar as a flying plate and the FPC as a substrate, the welding quality is guaranteed while making the overall surface of the busbar aluminum bar smoother after welding, avoiding changes in the overall external dimensions due to changes in the shape after welding, and better meeting the installation accuracy and space requirements during later assembly.

[0016] In a structure in which the part to be welded includes an inclined section and a flat section, on the basis of ensuring the flatness of the surface after welding, during the welding process, the slope structure formed by the inclined section can provide a certain collision angle for the center of the weld, and the flat section can prevent the welding gap from continuing to increase, thereby ensuring that sufficient electromagnetic force is generated in the welding area during the welding process, making the welding effect more stable, increasing the weldability of the center of the weld and improving the mechanical properties of the weld after welding, and providing better welding quality. It can ensure the stability and durability of the connection when subjected to mechanical stress, especially vibration and thermal expansion, and can better adapt to the complex environmental challenges that automobiles often face, such as vibration, temperature changes, humidity and chemical corrosion, etc., and help to extend the service life of automotive electronic components and ensure the reliability and safety of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the first embodiment of the busbar aluminum bar of the present invention.

[0018] Figure 2 It is a schematic diagram of the longitudinal cross-section structure of the first embodiment of the busbar aluminum bar of the present invention.

[0019] Figure 3 It is a schematic structural diagram of the second embodiment of the busbar aluminum bar of the present invention.

[0020] Figure 4 It is a schematic diagram of the longitudinal cross-sectional structure of the second embodiment of the busbar aluminum bar of the present invention.

[0021] Figure 5 It is a schematic diagram of the arrangement state of the FPC and the busbar aluminum bar during magnetic pulse welding of the present invention.

[0022] Figure 6 This is a top view of the FPC and the busbar aluminum bar during magnetic pulse welding of the present invention.

[0023] In the figure: 1. Aluminum bar main body; 2. Part to be welded; 21. Inclined section; 22. Plane section; 100. Busbar aluminum bar; 200. FPC; 300. Insulating spacer 1; 400. Insulating spacer 2; 500. Welding area. DETAILED DESCRIPTION

[0024] like Figure 1-Figure 6 As shown, the present invention provides a busbar aluminum bar structure suitable for magnetic pulse welding. The busbar aluminum bar structure includes an aluminum bar main body 1 and a portion to be welded 2 for magnetic pulse welding with FPC200, the portion to be welded 2 is integrally arranged at one end of the aluminum bar main body 1, that is, the portion to be welded 2 and the aluminum bar main body 1 are an integral structure, and the portion to be welded 2 is arranged in a concave shape relative to the aluminum bar main body 1, that is, there is a height difference between the portion to be welded 2 and the aluminum bar main body 1, the upper surface of the portion to be welded 2 is lower than the upper surface of the aluminum bar main body 1, and the lower surface is lower than the lower surface of the aluminum bar main body 1, and the width of the portion to be welded 2 is greater than or equal to the width of one end of the FPC200 for welding. When magnetic pulse welding is performed, the end of the FPC200 for welding is located above the upper surface of the portion to be welded 2.

[0025] Based on the above-mentioned structural setting, the present invention enables the to-be-welded portion 2 on the busbar aluminum bar 100 to form an independent module on the aluminum bar main body 1, which is independent of the aluminum bar main body 1, and has higher controllability during welding. While ensuring welding accessibility, the influence of electromagnetic force on other areas on the busbar aluminum bar 100 is minimized as much as possible. During the welding process, the aluminum bar main body of the busbar aluminum bar 100 is not affected by deformation, and the to-be-welded portion 2 is deformed by the upward action of the electromagnetic force, and finally becomes coplanar with the aluminum bar main body. When applied to the magnetic pulse welding of the busbar aluminum bar 100 and the FPC200, on the basis of realizing the welding method in which the busbar aluminum bar 100 is a flying plate and the FPC200 is a substrate, the welding quality is guaranteed while making the overall surface of the busbar aluminum bar 100 smoother after welding, avoiding changes in the overall external dimensions due to changes in the shape after welding, and better meeting the installation accuracy and space requirements during the later assembly.

[0026] In the first embodiment of the busbar aluminum bar structure of the present invention, Figure 1-Figure 2 As shown, one end of the aluminum bar body 1 is recessed downward along the upper surface and convex downward along the lower surface. Even if a part of the area at one end of the aluminum bar body 1 is recessed downward as a whole, the recessed part forms the to-be-welded portion 2. This embodiment is easy to process and can be formed by simple stamping. Figure 2 Point c is the horizontal length of the part to be welded 2, which is 10mm~25mm in size. Point d is the concave depth of the part to be welded 2 relative to the aluminum bar body 1, which is 0.8mm~2.4mm in size. This d is also the welding gap in specific applications.

[0027] In this embodiment 1, the length of the welding area 500 is 10mm, the horizontal length of the welded portion 2 is 23mm, different welding gaps d are used in the range of 0.4mm~3.0mm, and the busbar aluminum bar 100 and the FPC 200 are supported by the insulating spacer 1 300 and the insulating spacer 2 400 of corresponding heights, so that the lower surface of the FPC 200 is basically flush with the upper surface of the aluminum bar body 1, and the energy is selected to be 30KJ and the welding time is 25μs, and welding and testing are carried out in sequence, and the test standard is: GB / T2651-2008. The average maximum tensile load and failure mode are shown in Table 1 below: Table 1

[0028] It can be seen from Table 1 that under the aforementioned dimensions and welding parameters, the welding gap d is in the range of 1.2 mm to 1.6 mm, the welding quality is qualified, and based on the structure of the first embodiment, the surface flatness is high on the basis of the qualified welding quality.

[0029] In the second embodiment of the busbar aluminum bar structure of the present invention, Figure 3-Figure 4 As shown, the portion to be welded 2 includes an inclined section 21 and a plane section 22, and the inclined section 21 and the plane section 22 are arranged along the length direction of the portion to be welded 2. The inclined section 21 is arranged to be inclined downward along the length direction of the portion to be welded 2. Since the inclined section 21 is in an inclined state, the end at a higher position is the high end, and the end at a lower position is the low end. The plane section 22 is parallel to the aluminum bar body 1 and is integrally connected to the low end of the inclined section 21. The high end of the inclined section 21 is integrally connected to one end of the aluminum bar body 1, so that the portion to be welded 2 is integrally arranged at one end of the aluminum bar body 1. That is, in this embodiment, only one end of the portion to be welded 2 is connected to the aluminum bar body 1, and the portion to be welded 2 is in a cantilever structure on the aluminum bar body 1. The portion to be welded 2 as a whole is in a state of being inclined downward at one end of the aluminum bar body 1 and then horizontally bent. Compared with the first embodiment, the second embodiment ensures the flatness of the surface after welding. During the welding process, the slope structure formed by the inclined section 21 can provide a certain collision angle for the center of the weld. The plane section 22 can prevent the welding gap from continuing to increase, ensuring that sufficient electromagnetic force is generated in the welding area 500 during welding, making the welding effect more stable, increasing the weldability of the weld center, and improving the mechanical properties of the weld after welding, resulting in better weld quality.

[0030] In the above-mentioned second embodiment, it is further preferred that the junction of the inclined section 21 and the plane section 22 is located in the middle of the welding area 500, that is, after welding is completed, the junction of the inclined section 21 and the plane section 22 is the center area of ​​the weld to ensure that the center area of ​​the weld obtains a better welding effect.

[0031] The tilt angle α of the tilted section 21 relative to the aluminum bar body 1 is 4.5°~8.5°, which provides a certain collision angle at the center of the weld, increases the weldability of the center of the weld, and avoids welding failure or substandard welding quality caused by too small a gap between the welded portion 2 and the FPC 200 during welding. The horizontal length of the tilted section 21 and the length of the plane section 22 are the dimensions of the welded portion 2 along the length direction. Figure 4 As shown, point b is the horizontal length of the inclined section 21, which is 8 mm to 11 mm, and the length of the plane section 22 is 10 mm to 15 mm.

[0032] In the second embodiment, the length of the welding area 500 is 10 mm, the horizontal length of the inclined section 21 is 10 mm, and the horizontal length of the plane section 22 is 13 mm. Different inclination angles α are used in the range of 2.5° to 11°, and the busbar aluminum bar 100 and the FPC 200 are supported by the insulating spacer 1 300 and the insulating spacer 2 400 of corresponding heights, so that the lower surface of the FPC 200 is basically flush with the upper surface of the aluminum bar body 1, and the energy is selected to be 30 KJ and the welding time is 25 μs. The welding and testing are carried out in sequence, and the test standard is: GB / T2651-2008. The average maximum tensile load and failure mode are shown in Table 2 below: Table 2

[0033] It can be seen from Table 2 that under the aforementioned dimensions and welding parameters, the welding quality is qualified when the inclination angle α is within the range of 4.5°~8.5°. It can be seen from Table 2 that within the range of 5°~7.5°, the maximum tensile load it can withstand is higher, the welding quality is better, and the stability and durability of the connection when subjected to mechanical stress, especially vibration and thermal expansion, can be ensured, and it can better adapt to the complex environmental challenges that automobiles often face, such as vibration, temperature changes, humidity and chemical corrosion, etc., which helps to extend the service life of automotive electronic components and ensure the reliability and safety of the automobile.

[0034] In one configuration of the second embodiment, a notch is provided at one end of the aluminum bar body 1, the portion to be welded 2 is located in the notch, the high end of the inclined section 21 is integrally connected to one side of the notch, and the end of the plane section 22 away from the inclined section 21 is arranged in a direction away from the aluminum bar body 1, that is, Figure 3 As shown, the portion to be welded 2 is a cantilever structure retracted inwardly at the notch position of the aluminum bar body 1.

[0035] In another configuration of the second embodiment, the portion to be welded 2 is disposed at one end of the aluminum bar body 1 to extend away from the aluminum bar body 1. The two configurations can be selected according to actual processing requirements and efficiency.

[0036] In the present invention, it is further preferred that the width of the portion to be welded 2 is less than or equal to twice the width of one end of the FPC 200 used for welding, so as to avoid excessive force consumed by upward deformation during welding and affecting the welding effect.

[0037] The present invention also provides a magnetic pulse welding method for busbar aluminum bar 100 and FPC 200, wherein the busbar aluminum bar 100 has the above-mentioned busbar aluminum bar structure, and the method specifically comprises the following steps: S1. Check whether there are scratches or foreign matter on the surface of FPC200 and busbar aluminum bar 100, clean the surface of busbar aluminum bar 100 with anhydrous ethanol and dry it; peel off the outer insulation layer of the end of FPC200 used for welding to expose the copper foil layer.

[0038] S2. Use insulating spacer 1 300 to support busbar aluminum bar 100, so that the part to be welded 2 is naturally suspended; use insulating spacer 2 400 to support FPC 200, so that the end of FPC 200 used for welding is naturally suspended, and the end of FPC 200 is located above the upper surface of the part to be welded 2, so that the area where the copper foil layer is exposed overlaps with the part to be welded 2 in the welding direction, and keep the end of FPC 200 and the part to be welded 2 spaced apart in the welding direction. The area where the copper foil layer of FPC 200 overlaps with the part to be welded 2 in the welding direction takes the intersection of the inclined section 21 and the plane section 22 as the center line to form a welding area 500. The specific position of the welding area 500 is as follows: Figure 6 The length of the welding area 500 is the size of the welding area 500 along the horizontal length direction of the part to be welded 2, which is Figure 6 The height dimension of the dashed box in the middle.

[0039] S3. Select appropriate energy and welding time on the magnetic pulse welding equipment to perform magnetic pulse welding.

[0040] The magnetic pulse welding method of the busbar aluminum bar 100 and the FPC 200, on the basis of realizing the welding method of the busbar aluminum bar 100 as a flying plate and the FPC 200 as a substrate, ensures the welding quality while making the overall surface of the busbar aluminum bar 100 smoother after welding, avoiding the change of the overall external dimensions due to the change of the shape after welding, and better meeting the installation accuracy and space requirements during the later assembly. And when the embodiment 2 of the busbar aluminum bar structure is adopted, on the basis of ensuring the flatness of the surface after welding, during the welding process, the slope structure formed by the inclined section 21 can provide a certain collision angle for the center of the weld, and the plane section 22 can avoid the continuous increase of the welding gap, ensuring that sufficient electromagnetic force is generated during the welding process of the welding area 500, making the welding effect more stable, increasing the weldability of the weld center and improving the mechanical properties of the weld after welding. Compared with the conventional overall flat busbar aluminum plate for welding, the weld quality of the present invention is better.

[0041] Experimental Example 1: Using the busbar aluminum bar structure of the second embodiment of the present invention, the length of the welding area 500 is 10mm, the horizontal length of the inclined section 21 is 10mm, the horizontal length of the plane section 22 is 13mm, and the inclination angle α is 4.5°. The busbar aluminum bar 100 and the FPC 200 are supported by insulating spacers 1 300 and 2 400 of corresponding heights, so that the lower surface of the FPC 200 is basically flush with the upper surface of the aluminum bar body 1. At this time, the welding gap is about 0.6mm. The energy is 30KJ and the welding time is 25μs. Welding and testing are carried out according to the test standard: GB / T2651-2008.

[0042] Comparative Example 1: A conventional integral flat busbar aluminum bar is used, and the busbar aluminum bar 100 and FPC200 are supported by insulating spacers 1 300 and 2 400 of corresponding heights. The busbar aluminum bar 100 is used as a flying board and FPC200 is used as a substrate. The welding gap is 0.6mm and the welding time is 25μs. Welding and testing are carried out under different welding energies. The test standard is: GB / T2651-2008.

[0043] The average maximum tensile loads of Experimental Example 1 and Comparative Example 1 are shown in Table 3: Table 3

[0044] Experimental Example 2: Using the busbar aluminum bar structure of the second embodiment of the present invention, the length of the welding area 500 is 10mm, the horizontal length of the inclined section 21 is 10mm, the horizontal length of the plane section 22 is 13mm, and the inclination angle is α6°. The busbar aluminum bar 100 and the FPC 200 are supported by insulating spacers 1 300 and 2 400 of corresponding heights, so that the lower surface of the FPC 200 is basically flush with the upper surface of the aluminum bar body 1. At this time, the welding gap is about 1.0mm. The energy is 30KJ and the welding time is 25μs. Welding and testing are carried out. The test standard is: GB / T2651-2008.

[0045] Comparative Example 2: A conventional integral flat busbar aluminum bar is used, and the busbar aluminum bar 100 and FPC200 are supported by insulating spacers 300 and 400 of corresponding heights. The busbar aluminum bar 100 is used as a flying board and FPC200 is used as a substrate. The welding gap is 1.0mm and the welding time is 25μs. Welding and testing are carried out under different welding energies. The test standard is: GB / T2651-2008.

[0046] The average maximum tensile loads of Experimental Example 2 and Comparative Example 2 are shown in Table 4: Table 4

[0047] It can be seen from Table 3 and Table 4 that, compared with Comparative Examples 1 and 2, Embodiments 1 and 2 can meet the welding quality requirements faster at lower welding energy, and have higher energy utilization. Under the same welding energy, the maximum tensile load that Embodiments 1 and 2 can withstand is higher than that of Comparative Examples 1 and 2, and the welding quality is better, which can ensure the stability and durability of the connection when subjected to mechanical stress, especially vibration and thermal expansion, and can better adapt to the complex environmental challenges that automobiles often face, such as vibration, temperature changes, humidity and chemical corrosion, etc., which helps to extend the service life of automotive electronic components and ensure the reliability and safety of the automobile.

[0048] A person skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of protection of the present application is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0049] One or more embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the present application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of the present application should be included in the protection scope of the present application.

Claims

1. A busbar aluminum bar structure, characterized in that: The invention comprises an aluminum bar main body (1) and a portion to be welded (2) for magnetic pulse welding with an FPC, wherein the portion to be welded (2) is integrally arranged at one end of the aluminum bar main body (1), and the portion to be welded (2) is arranged in a concave shape relative to the aluminum bar main body (1), the upper surface of the portion to be welded (2) is lower than the upper surface of the aluminum bar main body (1), and the lower surface is lower than the lower surface of the aluminum bar main body (1), and the width of the portion to be welded (2) is greater than or equal to the width of one end of the FPC for welding, and when magnetic pulse welding is performed, the end of the FPC for welding is located above the upper surface of the portion to be welded (2).

2. The busbar aluminum bar structure according to claim 1, characterized in that: The portion to be welded (2) comprises an inclined section (21) and a plane section (22), wherein the inclined section (21) and the plane section (22) are arranged along the length direction of the portion to be welded (2), wherein the plane section (22) is parallel to the aluminum bar main body (1) and is integrally connected to the lower end of the inclined section (21), and the upper end of the inclined section (21) is integrally connected to one end of the aluminum bar main body (1), so that the portion to be welded (2) is integrally arranged at one end of the aluminum bar main body (1).

3. The busbar aluminum bar structure as claimed in claim 2, characterized in that: When magnetic pulse welding is performed, the junction between the inclined section (21) and the plane section (22) is located in the middle of the welding area (500).

4. The busbar aluminum bar structure as claimed in claim 3, characterized in that: The inclination angle α of the inclined section (21) relative to the aluminum bar main body (1) is 4.5° to 8.5°.

5. The busbar aluminum bar structure as claimed in claim 4, characterized in that: The horizontal length of the inclined section (21) is 8 mm to 11 mm, and the length of the plane section (22) is 10 mm to 15 mm.

6. The busbar aluminum bar structure according to any one of claims 2 to 5, characterized in that: A notch is provided at one end of the aluminum bar body (1), the portion to be welded (2) is located in the notch, the high end of the inclined section (21) is integrally connected to one side of the notch, and the end of the plane section (22) that is away from the inclined section (21) is arranged in a direction away from the aluminum bar body (1).

7. The busbar aluminum bar structure according to any one of claims 2 to 5, characterized in that: The portion to be welded (2) is arranged at one end of the aluminum bar main body (1) to extend in a direction away from the aluminum bar main body (1).

8. The busbar aluminum bar structure according to claim 1, characterized in that: One end of the aluminum bar body (1) is recessed downward along the upper surface and convex downward along the lower surface, thereby forming the portion to be welded (2).

9. The busbar aluminum bar structure according to any one of claims 1 to 5 and 8, characterized in that: The width of the portion to be welded (2) is less than or equal to twice the width of one end of the FPC used for welding.

10. A magnetic pulse welding method for busbar aluminum bar and FPC, characterized in that: The busbar aluminum bar (100) uses the busbar aluminum bar structure according to any one of claims 1 to 9, and the method comprises the following steps: S1. Peel off the outer insulation layer of the end of the FPC used for soldering to expose the copper foil layer; S2, positioning one end of the FPC for soldering above the upper surface of the portion to be soldered (2), so that the region where the copper foil layer is exposed overlaps with the portion to be soldered (2) in the soldering direction, and maintaining a gap between the end of the FPC and the portion to be soldered (2) in the soldering direction; S3. Perform magnetic pulse welding.

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