A compression mechanism and bus bar welding device
By designing a floating and swinging multi-head clamping mechanism, the problem of incomplete welding in the welding of three-outlet battery string groups by existing busbar welding devices has been solved, and stable welding of the end welding strip of the battery string group to the busbar has been achieved, avoiding incomplete welding and scratches.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WUXI AUTOWELL TECH
- Filing Date
- 2025-06-25
- Publication Date
- 2026-06-19
AI Technical Summary
When welding three-wire battery string groups, the pressure head of the existing busbar welding device may not be able to contact the weld strip at the non-overlapping position, resulting in a poor weld at the non-overlapping position.
A pressing mechanism is designed, including a lifting drive, a first mounting base and multiple pressing heads. Each pressing head can float up and down and swing left and right independently. By adaptively adjusting the contact with the welding strip, it ensures that the welding strip at all welding positions is pressed onto the busbar. The limiting groove and spring structure prevent the pressing head from falling off and being scratched.
It realizes the automatic welding of the end welding strip of the battery string to the busbar, avoids the phenomenon of incomplete welding, ensures the welding effect, and has a simple structure, reducing the risk of the pressure head scratching the busbar.
Smart Images
Figure CN224373005U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of photovoltaic production equipment, specifically a clamping mechanism and a busbar welding device. Background Technology
[0002] After arranging the battery strings into a battery string assembly, a busbar welding device is needed to weld the busbars to the welding strips at the ends of the battery strings. The busbar welding device includes a support platform and a clamping mechanism. The support platform is used to support the busbars, and the clamping mechanism is used to clamp the welding strips onto the busbars and cooperates with the support platform to weld the clamped welding strips and busbars.
[0003] Existing busbar welding devices use a single, elongated clamping head as their clamping mechanism. When the clamping mechanism presses down, the head simultaneously clamps all the weld strips on a single busbar. This clamping mechanism ensures that all weld strips are clamped when welding the end busbars to the weld strips at both ends of the battery string, guaranteeing a good welding result. However, for battery string arrays with three outputs, such as… Figure 1 The battery string assembly shown consists of 6 groups of 12 battery strings 100. Not only do the busbars 200 need to be welded to the solder strips at both ends of the battery string assembly, but the busbars 200 also need to be welded to the solder strips in the middle of the battery string assembly.
[0004] like Figure 2 and Figure 3 As shown, the busbar 200, welded to the middle of the battery string assembly, has battery strings 100 on both sides (only the end battery cells of the battery strings 100 are shown in the figure). When the weld strips 300 on the battery strings 100 on both sides are stacked onto the busbar 200, overlapping is likely to occur. The weld strip at overlap position A (where the two weld strips overlap in the height direction) is significantly higher than the weld strip at the non-overlap position B (where the two weld strips do not overlap in the height direction). Therefore, when using the existing clamping mechanism to press the weld strip onto the middle busbar, the clamping head may not be able to contact the weld strip at the non-overlap position B, ultimately resulting in a weak weld after welding at the non-overlap position B. Utility Model Content
[0005] To address the aforementioned technical problems, this application provides a clamping mechanism and a busbar welding device, the detailed technical solution of which is as follows:
[0006] A clamping mechanism is used to clamp the welding strip at the end of a battery string onto a busbar to be welded. The clamping mechanism includes a lifting drive, a first mounting base, and n pressure heads, wherein:
[0007] The first mounting base is connected to the drive end of the lifting drive component, which is used to drive the first mounting base to move up and down.
[0008] n pressure heads are spaced apart on the first mounting base along the first direction. Each pressure head is configured to float up and down and swing left and right relative to the first mounting base. Each pressure head is used to press the welding strips of two adjacent welding positions onto the busbar placed along the first direction. Two welding strips are placed at each welding position.
[0009] n≥2.
[0010] The clamping mechanism provided in this application has n pressure heads on its first mounting base, and each pressure head can independently float up and down and swing left and right relative to the first mounting base. Thus, during the descent of the first mounting base driven by the lifting drive, the pressure head that first contacts the welding strip at the corresponding welding position can adaptively float upwards. As the first mounting base continues to descend, all pressure heads can press down on the welding strip at the corresponding welding position. Furthermore, when there is a height difference between the welding strips at two welding positions corresponding to the same pressure head, the pressure head can also clamp the welding strips at both welding positions by swinging left and right. This ensures that the welding strips at all welding positions on the busbar can be clamped onto the busbar, preventing incomplete welds after welding. Simultaneously, since each pressure head clamps the welding strips at two adjacent welding positions onto the busbar, once the pressure head has clamped the welding strip, it cannot continue to swing left and right, preventing the pressure head from scratching the busbar due to excessive left and right swing amplitude during the floating process.
[0011] In some embodiments, the bottom of the first mounting base is provided with at least one downward-opening mounting groove; the pressure head includes a limiting part and a pressing part arranged vertically, wherein the limiting part is confined within the mounting groove and can float up and down and swing left and right within the mounting groove, the pressing part extends downward through the opening of the mounting groove, and the lower end of the pressing part has a pressing surface for pressing the welding strip.
[0012] The limiting part of the pressure head is constrained within the mounting groove and can float up and down and swing left and right within the mounting groove, ensuring the freedom of movement of the pressure head and preventing it from falling off. The pressing part of the pressure head extends downward into the mounting groove, ensuring that its bottom pressing surface can fully contact and press the welding strip.
[0013] In some embodiments, the limiting portion of the pressure head is connected to the first mounting base via at least one spring.
[0014] The limiting part of the pressure head is connected to the first mounting base via a spring, allowing the limiting part to float up and down and swing left and right within the mounting groove.
[0015] In some embodiments, two limiting steps are formed at the opening of the mounting groove, which are arranged opposite each other along a second direction. The two limiting steps limit the limiting portion of the pressure head within the mounting groove, and the second direction is perpendicular to the first direction.
[0016] It achieves the limiting of the pressure head's limiting part, preventing the limiting part from dislodging from the mounting groove.
[0017] In some embodiments, a mounting groove is provided at the bottom of the first mounting base, the mounting groove extends along a first direction, and the gap between two adjacent pressure heads is less than or equal to 1.5 mm.
[0018] All pressure head limiting parts are uniformly installed in a single mounting slot, reducing the structural complexity of the clamping mechanism. There is a gap of less than or equal to 1.5mm between adjacent pressure heads. This provides space for the left and right swing of each pressure head, and also allows adjacent pressure heads to guide each other's lifting and lowering, preventing excessive left and right swinging of the pressure heads from scratching the manifold at the bottom edge.
[0019] In some embodiments, the bottom of the first mounting base is provided with n mounting slots corresponding one-to-one with the pressure head, and the limiting part of each pressure head is limited in the corresponding mounting slot. The length of the limiting part along the first direction is less than the length of the corresponding mounting slot along the first direction.
[0020] Each pressure head's limiting part is installed in an independent mounting slot, improving the pressure head's positional stability. The length of the pressure head's limiting part along the first direction is less than the length of the corresponding mounting slot along the first direction. This provides space for the pressure head to swing left and right, while preventing excessive left and right swinging of the pressure head from scratching the manifold at the bottom edge of the pressure head.
[0021] In some embodiments, the pressing surface of the pressing part is provided with a plurality of anti-slip grooves extending in a first direction.
[0022] By setting anti-slip grooves on the pressing surface of the pressing part, it is ensured that the pressing part of the pressing head can stably press the welding strip onto the busbar, avoiding slippage.
[0023] This application also provides a busbar welding device, which includes a clamping mechanism and a welding support mechanism, wherein: the welding support mechanism includes a second mounting base and m support platforms, the m support platforms are mounted on the second mounting base along a first direction, and the support platforms are used to support the busbar extending along the first direction; the clamping mechanism is disposed above the welding support mechanism, and the clamping mechanism is used to clamp the welding strip at the end of the battery string to the busbar located on the support platform, and the clamping mechanism is any of the above-mentioned clamping mechanisms; m≥1.
[0024] Through the cooperation of the welding support mechanism and the clamping mechanism, the busbar welding device of this application realizes the automatic welding of the welding strip at the end of the battery string to the busbar, and can ensure the welding strip clamping effect and avoid incomplete welding.
[0025] In some embodiments, a heating component is provided in the support platform or the first mounting base for heating the busbar and welding strip pressed against the support platform.
[0026] After the clamping mechanism presses the welding strip at the end of the battery string onto the busbar located on the support platform, the heating component in the support platform or the first mounting base directly heats the welding strip and the busbar, thereby achieving welding between the welding strip and the busbar without the need for an additional heating welding mechanism.
[0027] In some embodiments, the welding support mechanism further includes a drive unit, which is throttle-connected to the second mounting base and is used to drive the second mounting base to move.
[0028] The second mounting base is moved by the drive unit, so that m carrier platforms can move and switch between the busbar receiving station and the busbar welding station. Attached Figure Description
[0029] Figure 1 It is a battery string group consisting of 6 groups of 12 battery strings;
[0030] Figure 2 This is a schematic diagram showing the relative positions of the busbar and the solder strip in the middle of the battery string assembly;
[0031] Figure 3 This is a schematic diagram showing the state of the solder strips on the busbar stacked in the middle of the battery string before they are pressed together.
[0032] Figure 4 This is a schematic diagram of the clamping mechanism in the embodiments of this application;
[0033] Figure 5 This is a schematic diagram of the pressing mechanism after omitting the lifting mechanism in the embodiments of this application;
[0034] Figure 6 for Figure 5 CC section view;
[0035] Figure 7 This is a schematic diagram showing the state of the pressure head before it presses the welding strip in an embodiment of this application;
[0036] Figure 8 This is a schematic diagram showing the state of the pressure head when it contacts the weld strip at the welding position in an embodiment of this application;
[0037] Figure 9 This is a schematic diagram showing the state of the pressure head after it has fully compressed the welding strip in an embodiment of this application;
[0038] Figure 10 This is a schematic diagram of the busbar welding device in the embodiments of this application.
[0039] Figures 1 to 10 Includes:
[0040] Clamping mechanism 10:
[0041] Lifting drive component 1;
[0042] First mounting base 2: mounting groove 21, limiting step 22;
[0043] Pressure head 3: limiting part 31, pressing part 32, anti-slip groove 33;
[0044] Spring 4;
[0045] Welding bearing mechanism 20:
[0046] Second mounting base 21;
[0047] Support platform 22.
[0048] Battery string 100, busbar 200, welding strip 300. Detailed Implementation
[0049] To make the above-mentioned objects, features, and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.
[0050] As described in the background section, when using an existing clamping mechanism with a single elongated pressure head to press the welding strip onto the central busbar, the pressure head of the clamping mechanism may not be able to contact the welding strip at the non-overlapping position, ultimately resulting in a poor weld at the non-overlapping position.
[0051] In view of this, this application provides a clamping mechanism for clamping the solder strips at the ends of the battery string onto the busbar to be welded. For example... Figures 4 to 6 As shown, the clamping mechanism 10 in this application includes a lifting drive 1, a first mounting base 2, and n pressure heads 3, wherein:
[0052] The first mounting base 2 is connected to the drive end of the lifting drive component 1, which is used to drive the first mounting base 2 to move up and down.
[0053] n pressure heads 3 are spaced apart on the first mounting base 2 along a first direction (e.g., the X direction). Each pressure head 3 is configured to float up and down and swing left and right relative to the first mounting base 2. Each pressure head 3 is used to press the weld strips at two adjacent welding positions onto the busbar placed along the first direction. Each welding position has two weld strips. The welding position refers to the location where the weld strips are welded to the busbar, such as... Figure 7 As shown, there are 6 welding positions, and two welding strips are placed at each welding position.
[0054] n is at least 2, for example Figures 4 to 5 Each clamping mechanism 10 in the illustrated embodiment includes 5 pressure heads 3, i.e., n=5. Of course, in other embodiments, other numbers of pressure heads 3, such as 2, 3, 4, or 6, can also be provided.
[0055] The clamping mechanism 10 provided in this application has n pressure heads 3 on its first mounting base 2, and each pressure head 3 can independently float up and down and swing left and right relative to the first mounting base 2.
[0056] The following will combine Figures 7 to 9 Taking the clamping mechanism 10, which includes three pressure heads 3, as an example, the working process of the clamping mechanism 10 in this application embodiment is described exemplarily as follows:
[0057] For easy distinction, the three pressure heads are designated as the first pressure head, the second pressure head, and the third pressure head from left to right along the first direction (e.g., the X direction).
[0058] like Figure 7 As shown, in the initial state, all three pressure heads 3 are located at an initial high position far from the weld strip 300. Among them, in the two welding positions corresponding to the first pressure head 3, the left welding position is an lap weld strip, and the right welding position is a non-lap weld strip; in the two welding positions corresponding to the second pressure head 3, the left welding position is a non-lap weld strip, and the right welding position is an lap weld strip; in the two welding positions corresponding to the third pressure head 3, both are non-lap weld strips.
[0059] like Figure 8 As shown, when the lifting drive 1 drives the first mounting base 2 to descend to a predetermined height, the first pressure head 3 contacts the lap weld strip at the left welding position but does not contact the non-lap weld strip at the right welding position; the second pressure head 3 contacts the lap weld strip at the right welding position but does not contact the non-lap weld strip at the left welding position; the third pressure head 3 does not contact the corresponding two non-lap weld strips.
[0060] The lifting drive component 1 drives the first mounting base 2 to continue descending. (Example:) Figure 9 As shown, the first pressure head 3 swings to the right until it presses down on the unoverlapped weld strip at the right welding position. The second pressure head 3 swings to the left until it presses down on the unoverlapped weld strip at the left welding position. The third pressure head 3 continues to descend until it presses down on the two corresponding unoverlapped weld strips. At this point, all three pressure heads 3 have pressed down on the weld strips at the two corresponding welding positions.
[0061] As can be seen, the clamping mechanism provided in this application has n pressure heads 3 on its first mounting base 2, and each pressure head 3 can independently float up and down and swing left and right relative to the first mounting base 2. Thus, during the process of the lifting drive 1 driving the first mounting base 2 to descend, the pressure head 3 that first contacts the welding strip at the corresponding welding position can adaptively float upward. As the first mounting base 2 continues to descend, all pressure heads 3 can press down on the welding strip at the corresponding welding position. Furthermore, when there is a height difference between the welding strips at two welding positions corresponding to the same pressure head 3, the pressure head 3 can also clamp the welding strips at both welding positions by swinging left and right. This ensures that the welding strips 300 at all welding positions on the busbar 200 can be clamped onto the busbar 200, avoiding incomplete welding.
[0062] Meanwhile, since each pressure head 3 presses the welding strips of two adjacent welding positions onto the busbar 200, after the pressure head presses the welding strips, it can no longer swing left and right. This can prevent the bottom edge of the pressure head 3 from scratching the busbar 200 due to excessive left and right swing amplitude during the floating process.
[0063] The lifting drive component 1 can be any existing linear drive component capable of driving the first mounting base 2 to lift, such as a cylinder, electric cylinder, or linear motor.
[0064] like Figure 6 As shown, optionally, the bottom of the first mounting base 2 is provided with at least one downward-opening mounting groove 21. The pressure head 3 includes a limiting part 31 and a pressing part 32 arranged vertically. The limiting part 31 is confined within the mounting groove 21 and can float up and down and swing left and right within the mounting groove 21. The pressing part 32 extends downward through the opening of the mounting groove 21 and has a pressing surface at its lower end for pressing the welding strip.
[0065] The limiting part 31 of the pressure head 3 is constrained within the mounting groove 21 and can float up and down and swing left and right within the mounting groove 21, thereby ensuring the floating freedom of the pressure head 3 and preventing the pressure head 3 from falling off. The pressing part 32 of the pressure head 3 extends downward out of the mounting groove 21, thus ensuring that the pressing surface at its bottom can fully contact and press the welding strip.
[0066] Optionally, the limiting part 31 of the pressure head 3 is connected to the first mounting base 2 via at least one spring 4. The number of springs can be one, two, or three, etc. The limiting part 31 of the pressure head 3 is connected to the first mounting base 2 via the spring 4, so that the limiting part 31 can float up and down and swing left and right within the mounting groove 21.
[0067] like Figure 6As shown, optionally, two limiting steps 22 are formed at the opening of the mounting groove 21, which are arranged opposite each other along a second direction (such as the Y direction). The two limiting steps 22 limit the limiting part 31 of the pressure head 3 within the mounting groove 21, and the second direction is perpendicular to the first direction.
[0068] The two limiting steps 22 provide limiting support for the limiting part 31 of the pressure head 3, preventing the limiting part 31 from dislodging from the mounting groove 21.
[0069] In an optional embodiment, the bottom of the first mounting base 2 is provided with a mounting groove 21, which extends along a first direction, and the gap between two adjacent pressure heads 3 is less than or equal to 1.5 mm.
[0070] By uniformly installing the limiting parts 31 of all pressure heads 3 in a single mounting groove 21, the structural complexity of the clamping mechanism is reduced. Furthermore, since there is a gap of less than or equal to 1.5mm between adjacent pressure heads 3, sufficient space is provided for the left and right swinging of each pressure head 3. On the other hand, adjacent pressure heads 3 can guide each other's lifting and lowering, preventing excessive swinging amplitude of the pressure heads 3 from scratching the busbar.
[0071] In another optional embodiment, the bottom of the first mounting base 2 is provided with n mounting slots 21 corresponding one-to-one with the pressure head 3. The limiting part 31 of each pressure head 3 is limited in the corresponding mounting slot 21. The length of the limiting part 31 along the first direction is less than the length of the corresponding mounting slot 21 along the first direction.
[0072] Since the limiting part 31 of each pressure head 3 is installed in an independent mounting groove 21, the positional stability of the pressure head 3 is improved. In addition, since the length of the limiting part 31 of the pressure head 3 along the first direction is less than the length of the corresponding mounting groove 21 along the first direction, sufficient space is provided for the left and right swing of the pressure head 3, and the swing amplitude of the pressure head 3 is prevented from being too large and scratching the busbar.
[0073] like Figure 5 As shown, optionally, the pressing surface of the pressing part 32 is provided with a plurality of anti-slip grooves 33 extending in the first direction. By providing anti-slip grooves 33 on the pressing surface of the pressing part 32, it is ensured that the pressing part 32 of the pressing head 3 can stably press the welding strip onto the busbar, avoiding slippage.
[0074] This application also provides a busbar welding device. For example... Figure 10As shown, the busbar welding device includes a clamping mechanism 10 and a welding support mechanism 20. The welding support mechanism 20 includes a second mounting base 21 and m support platforms 22. The m support platforms 22 are mounted on the second mounting base 21 along a first direction, and each support platform 22 supports a busbar extending along the first direction. The clamping mechanism 10 is positioned above the welding support mechanism 20 and is used to clamp the welding strip at the end of the battery string to the busbar located on the support platform 22. The clamping mechanism 10 is the clamping mechanism 10 provided in any of the above embodiments; m ≥ 1.
[0075] Through the cooperation of the welding support mechanism 20 and the clamping mechanism 10, the busbar welding device of this application realizes the automatic welding of the welding strip at the end of the battery string and the busbar, and can ensure the welding strip clamping effect and avoid incomplete welding.
[0076] Figure 10 In the illustrated embodiment, three support platforms 22 are provided, i.e., m = 3. Correspondingly, three clamping mechanisms 10 are provided, each corresponding to one of the support platforms 22. Each clamping mechanism 10 is used to clamp the welding strip onto the busbar on the corresponding support platform 22.
[0077] In other embodiments, one, two, four, or other numbers of support platforms 22 may be provided as needed. In the case where there are two or more support platforms 22, during the welding process, the busbar to be welded may be supported on one support platform 22 or simultaneously on two or more support platforms 22.
[0078] Optionally, a heating component is provided in the support platform 22 or the first mounting base 2. The heating component is used to heat the busbar and welding strip that are pressed on the support platform 22.
[0079] After the clamping mechanism 10 clamps the welding strip at the end of the battery string onto the busbar located on the support platform 22, the heating component in the support platform 22 or the first mounting base 2 directly heats the welding strip and the busbar, thereby achieving welding between the welding strip and the busbar without the need for an additional heating welding mechanism.
[0080] Heating components can be, for example, electromagnetic heating components consisting of a magnetic core and a coil wound around the magnetic core. Of course, heating components can also be other types of heating mechanisms such as heating rods.
[0081] Optionally, the welding support mechanism 20 also includes a drive unit, which is connected to the second mounting base 21 in a transmission manner, and is used to drive the second mounting base 21 to move.
[0082] The second mounting base 21 is moved by the drive unit, allowing the m carrier platforms 22 to switch between the busbar feeding station and the busbar welding station. Specifically, when the m carrier platforms 22 move to the busbar feeding station, the busbar feeding mechanism places the busbar to be welded onto the m carrier platforms 22. Subsequently, the m carrier platforms 22 move to the busbar welding station located below the clamping mechanism 10, where the clamping mechanism 10 presses the welding strip onto the busbar to weld the welding strip onto the busbar.
[0083] The drive unit can be a linear drive module with various existing structures that can drive the second mounting base 21 to move, such as a cylinder, a linear drive module consisting of a motor, a synchronous pulley and a synchronous belt, or a linear drive module consisting of a motor, a lead screw and a nut.
[0084] This application provides a sufficiently detailed and specific description. Those skilled in the art should understand that the descriptions in the embodiments are merely exemplary, and all changes made without departing from the true spirit and scope of this application should fall within its protection scope. The scope of protection claimed in this application is defined by the claims, not by the above descriptions in the embodiments. Without contradiction, some optional components in one embodiment can also be used in another embodiment, and some preferred structures of the same component in one embodiment are also applicable to another embodiment. Furthermore, there may be slight differences in the wording of the names of certain components in different embodiments; these slight differences will not affect the understanding of the technical solution of the present invention by those skilled in the art.
Claims
1. A compression mechanism, characterized in that, The clamping mechanism is used to press the solder strips at the ends of the battery string onto the busbar to be welded. The clamping mechanism includes a lifting drive, a first mounting base, and n pressure heads, wherein: The first mounting base is connected to the drive end of the lifting drive component, which is used to drive the first mounting base to move up and down. n pressure heads are spaced apart on the first mounting base along the first direction. Each pressure head is configured to float up and down and swing left and right relative to the first mounting base. Each pressure head is used to press the welding strips of two adjacent welding positions onto the busbar placed along the first direction. Two welding strips are placed at each welding position. n≥2。 2. The holdback mechanism of claim 1 wherein, The bottom of the first mounting base is provided with at least one downward-opening mounting groove; The pressure head includes a limiting part and a pressing part arranged vertically. The limiting part is confined within the mounting groove and can float vertically and swing horizontally within the mounting groove. The pressing part extends downward through the opening of the mounting groove and has a pressing surface at its lower end for pressing the welding strip.
3. The holdback mechanism of claim 2 wherein, The limiting part of the pressure head is connected to the first mounting base via at least one spring.
4. The holdback mechanism of claim 2 wherein, The opening of the mounting groove has two limiting steps arranged opposite each other along a second direction. The two limiting steps limit the limiting part of the pressure head within the mounting groove. The second direction is perpendicular to the first direction.
5. The holdback mechanism of claim 2 wherein, The bottom of the first mounting base is provided with a mounting groove, which extends along the first direction, and the gap between two adjacent pressure heads is less than or equal to 1.5 mm.
6. The holdback mechanism of claim 2 wherein, The bottom of the first mounting base is provided with n mounting slots that correspond one-to-one with the pressure head. The limiting part of each pressure head is limited in the corresponding mounting slot. The length of the limiting part along the first direction is less than the length of the corresponding mounting slot along the first direction.
7. The holdback mechanism of claim 2 wherein, The pressing surface of the pressing part is provided with several anti-slip grooves extending along the first direction.
8. A busbar welding apparatus characterized by comprising: The busbar welding device includes a clamping mechanism and a welding bearing mechanism, wherein: The welding support mechanism includes a second mounting base and m support platforms. The m support platforms are mounted on the second mounting base along a first direction. The support platforms are used to support the busbars extending along the first direction. The clamping mechanism is disposed above the welding support mechanism. The clamping mechanism is used to clamp the welding strip at the end of the battery string to the busbar located on the support platform. The clamping mechanism is the clamping mechanism according to any one of claims 1 to 7. m≥1。 9. The bus bar welding apparatus of claim 8, wherein A heating component is provided inside the support platform or the first mounting base, and the heating component is used to heat the busbar and welding strip pressed on the support platform.
10. The bus bar welding apparatus of claim 8, wherein The welding support mechanism further includes a drive unit, which is connected to the second mounting base in a transmission manner, and is used to drive the second mounting base to move.