A battery module busbar welding fixture and laser welding device

Abstract

This utility model discloses a battery module busbar welding fixture and laser welding device, including an L-shaped plate assembly, a copper sleeve assembly, a dust removal assembly, a pressing assembly, and a displacement detection assembly. The dust removal assembly is located at the upper end of the L-shaped plate assembly, the copper sleeve assembly at the lower end, and the pressing assembly on one side. The displacement detection assembly is located at the upper end of the pressing assembly. The pressing assembly utilizes a motor-driven ball screw to achieve precise movement, ensuring consistent pressing at each welding point. The displacement detection assembly monitors the pressing displacement in real time, further ensuring pressing accuracy and enabling tight contact between the battery cell terminals and the busbar, improving welding quality. Simultaneously, the dust removal assembly collects dust and impurities generated during welding through a dust hood and discharges them through a dust removal pipe, effectively solving the dust removal problem at the welding points and preventing impurities from affecting the conductivity and strength of the weld.

Description

Technical Field

[0001] This utility model relates to the field of battery module busbar welding, and in particular to a battery module busbar welding fixture and laser welding device. Background Technology

[0002] Currently, many battery factories use integrated pressure modules for pressure welding of the components during the battery module welding process. However, due to the large number of cells in a battery module, it is impossible to guarantee the consistency of dust removal and pressure at each welding point, significantly reducing the welding pass rate.

[0003] While the integral clamping block used in laser welding can meet welding requirements to some extent, its limitations are obvious. Firstly, a single clamping block is typically only suitable for welding a single model. When welding different models of battery module busbars, frequent clamping block replacements are necessary, making the process cumbersome and time-consuming. Secondly, the integral clamping block is installed on top, occupying a significant amount of space. This not only places high demands on the spatial layout of the production workshop but also hinders the overall arrangement of production line equipment. Furthermore, to ensure welding quality, the machining precision of the integral clamping block is extremely high; even minor machining errors can lead to welding problems, undoubtedly increasing production costs. Moreover, once the integral clamping block is damaged, the replacement and repair process is complex, requiring considerable time and cost, further impacting production progress and corporate profits. Utility Model Content

[0004] The purpose of this invention is to provide a battery module busbar welding fixture and a laser welding device to solve the above-mentioned technical problems.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A battery module busbar welding fixture includes an L-shaped plate assembly, a copper sleeve assembly, a dust removal assembly, a pressing assembly, and a displacement detection assembly. The dust removal assembly is disposed at the upper end of the L-shaped plate assembly, the copper sleeve assembly is disposed at the lower end of the L-shaped plate assembly, the pressing assembly is disposed on one side of the L-shaped plate assembly, and the displacement detection assembly is disposed at the upper end of the pressing assembly.

[0007] Preferably, the L-shaped plate assembly includes a base plate, a vertical plate, a slider mounting plate, reinforcing ribs, and a calibration block. The vertical plate is provided at one end of the base plate, the slider mounting plate is provided on one side of the vertical plate, a slider is provided on the slider mounting plate, two reinforcing ribs are provided on both sides of the base plate, and the calibration block is provided on the other side of the vertical plate.

[0008] As a further preferred embodiment, the base plate also includes wedge blocks and six-star Torx screws. Two wedge blocks are provided on both sides of the base plate, and each wedge block is provided with one six-star Torx screw.

[0009] As a further preferred embodiment, the copper sleeve assembly includes a copper sleeve pressure head, a base plate, and a wedge plate. The wedge plate is disposed at the lower end of the base plate and is located between two wedge blocks. The six-star Torx screw is threadedly engaged with the wedge plate. A plurality of base plates are disposed at the lower end of the wedge plate, and the copper sleeve pressure head is disposed on the base plates.

[0010] As a further preferred embodiment, the system also includes a connecting rod and a spring, wherein the connecting rod is threadedly connected to the wedge plate, the base plate is slidably connected to the connecting rod, and the spring is provided on the connecting rod, with both ends of the spring abutting against the wedge plate and the base plate.

[0011] As a further preferred embodiment, the dust removal assembly includes a dust removal hood and a dust removal pipe, with the dust removal hood disposed at the upper end of the base plate, and the dust removal pipe passing through the reinforcing rib and communicating with the interior of the dust removal hood.

[0012] As a further preferred embodiment, the pressing assembly includes a guide rail mounting plate, a ball screw, a motor mounting plate, a belt, and a motor. The ball screw and guide rail are disposed on one side of the guide rail mounting plate, the slider is connected to the guide rail, and the nut on the ball screw is connected to the vertical plate. The motor mounting plate is disposed on the other side of the guide rail mounting plate, and the motor is disposed on the motor mounting plate. The output end of the motor is connected to the ball screw via the belt.

[0013] As a further preferred embodiment, the displacement detection assembly includes an L-shaped connecting plate, a cable chain plate, a cylinder mounting plate, a cable chain, a cylinder, a Z-shaped sheet metal, a buffer mounting plate, a cylinder connecting block, and a displacement sensor. The L-shaped connecting plate is mounted on the upper end of the guide rail mounting plate. The cylinder mounting plate and the cable chain plate are disposed on the upper end of the L-shaped connecting plate. The cable chain is disposed on the cable chain plate. The cylinder and the buffer mounting plate are disposed on the upper end of the cylinder mounting plate. The Z-shaped sheet metal connects the buffer mounting plate and the cable chain. The cylinder connecting block connects the output end of the cylinder and the buffer mounting plate. The displacement sensor is disposed on the side wall of the cylinder connecting block.

[0014] As a further preferred embodiment, the system also includes a proximity switch mounting plate, a proximity switch, and a buffer. The proximity switch mounting plate is disposed on the side wall of the cylinder mounting plate, the proximity switch is disposed on the proximity switch mounting plate, and the buffer is disposed at one end of the buffer mounting plate.

[0015] A laser welding apparatus includes the aforementioned battery module busbar welding fixture, a fixed bracket, and an electric cylinder disposed on the upper end of the fixed bracket, wherein the battery module busbar welding fixture is mounted on the electric cylinder.

[0016] The above technical solution has the following advantages or beneficial effects:

[0017] (1) In this utility model, by setting up a pressing component, the precise movement of the pressing component is achieved by using a motor-driven ball screw, ensuring the consistency of pressing down on each welding point. The displacement detection component monitors the pressing displacement in real time, further ensuring the pressing accuracy, so that the battery cell terminal and the busbar can make close contact, improving the welding quality. At the same time, the dust removal component collects the dust and impurities generated during welding through the dust removal hood and discharges them through the dust removal pipe, effectively solving the dust removal problem at the welding point and avoiding the impact of impurities on the conductivity and firmness of the weld.

[0018] (2) In this utility model, by setting up the copper sleeve assembly, the copper sleeve assembly can be quickly replaced by simply turning the six-star Torx screws to meet the welding requirements of different module busbars. This setting allows the fixture to adapt to the welding of various battery module busbars, greatly improving the versatility of the fixture, reducing the need to replace the entire fixture due to model changes, and improving production flexibility and efficiency.

[0019] (3) In this utility model, the L-shaped plate assembly is used as the basic support, which provides an orderly installation foundation for other structures and avoids the problem of the overall pressing block occupying a lot of space.

[0020] (4) In this utility model, the quick replacement design of the copper sleeve assembly avoids the high cost caused by frequent replacement of the overall pressure plate due to welding different models of products.

[0021] (5) In this utility model, the copper sleeve assembly can be quickly replaced by a six-star Torx hand-tightening screw, which is simple and convenient to operate and greatly shortens the production downtime caused by component replacement. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the battery module busbar welding fixture in this utility model;

[0023] Figure 2 This is a schematic diagram of the bottom structure of the battery module busbar welding fixture in this utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the laser welding device of this utility model.

[0025] In the diagram: 1. L-shaped plate assembly; 101. Base plate; 102. Vertical plate; 103. Slider mounting plate; 104. Reinforcing rib; 105. Calibration block; 106. Wedge block; 107. Six-star Torx hand-tightening screw; 2. Copper sleeve assembly; 201. Copper sleeve pressure head; 202. Base plate; 203. Wedge plate; 204. Spring; 3. Dust removal assembly; 301. Dust removal hood; 302. Dust removal pipe; 4. Downward pressing assembly; 401. Guide rail mounting plate; 402. Ball screw; 403. Electric... 404. Machine mounting plate; 405. Belt; 406. Motor; 5. Displacement detection assembly; 501. L-shaped connecting plate; 502. Cable chain plate; 503. Cylinder mounting plate; 504. Cable chain; 505. Cylinder; 506. Z-shaped sheet metal; 507. Buffer mounting plate; 508. Cylinder connecting block; 509. Displacement sensor; 510. Proximity switch mounting plate; 511. Proximity switch; 512. Buffer; 6. Fixed bracket; 7. Electric cylinder; 8. Battery module busbar welding fixture. Detailed Implementation

[0026] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0027] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] Figure 1This is a schematic diagram of the battery module busbar welding fixture in this utility model; Figure 2 This is a schematic diagram of the bottom structure of the battery module busbar welding fixture in this utility model; Figure 3 This is a structural schematic diagram of the laser welding device of this utility model. Please refer to [link / reference]. Figures 1 to 3 The image shows a battery module busbar welding fixture, including an L-shaped plate assembly 1, a copper sleeve assembly 2, a dust removal assembly 3, a pressing assembly 4, and a displacement detection assembly 5. The dust removal assembly 3 is located at the upper end of the L-shaped plate assembly 1, the copper sleeve assembly 2 is located at the lower end of the L-shaped plate assembly 1, the pressing assembly 4 is located on one side of the L-shaped plate assembly 1, and the displacement detection assembly 5 is located at the upper end of the pressing assembly 4. In this embodiment, the copper sleeve assembly 2 is used to contact the welding surface and provide protective gas during the welding process. The dust removal assembly 3 removes dust during the welding process. The pressing assembly 4 presses down on the copper sleeve assembly 2 to contact the welding surface after the workpiece reaches the designated position. The displacement detection assembly detects the descent distance of the pressing assembly 4, ensuring that the copper sleeve assembly 2 can stably press the workpiece to be welded.

[0030] Furthermore, as a preferred embodiment, the L-shaped plate assembly 1 includes a base plate 101, a vertical plate 102, a slider mounting plate 103, reinforcing ribs 104, and a calibration block 105. The vertical plate 102 is located at one end of the base plate 101, and the slider mounting plate 103 is located on one side of the vertical plate 102. A slider is mounted on the slider mounting plate 103. Two reinforcing ribs 104 are located on both sides of the base plate 101, and the calibration block 105 is located on the other side of the vertical plate 102. In this embodiment, the reinforcing ribs 104 enhance the overall structural strength of the L-shaped plate assembly 1, preventing deformation due to stress during welding. The reinforcing ribs 104 can be connected to the vertical plate 102 and the base plate 101 by bolts or by welding. The welding or bolt connection between the vertical plate 102 and the base plate 101 ensures that the perpendicularity between the vertical plate 102 and the base plate 101 meets the accuracy requirements. The slider mounting plate 103 is connected to the upright plate 102 by bolts, and the slider is fixed on the slider mounting plate 103. The calibration block 105 is used to cooperate with the displacement sensor 509 in the displacement detection assembly 5, and can be used to calibrate whether the displacement detection meets the standard.

[0031] Furthermore, as a preferred embodiment, it also includes wedge blocks 106 and six-star Torx hand screws 107. Two wedge blocks 106 are also provided on both sides of the base plate 101, and each wedge block 106 is provided with a six-star Torx hand screw 107. In this embodiment, the wedge blocks 106 are provided on the lower ends of both sides of the base plate 101 and are welded or bolted to the base plate 101. The wedge blocks 106 are provided with threaded holes that mate with the six-star Torx hand screws 107.

[0032] Furthermore, as a preferred embodiment, the copper sleeve assembly 2 includes a copper sleeve pressure head 201, a base plate 202, and a wedge plate 203. The lower end of the base plate 101 is provided with a wedge plate 203, which is located between two wedge blocks 106. A six-star tortoise-shaped hand screw 107 is threadedly engaged with the wedge plate 203, which enables the rapid fixing and adjustment of the copper sleeve assembly 2.

[0033] The lower end of the wedge plate 203 is provided with several base plates 202. A copper sleeve pressure head 201 is mounted on each base plate 202, which also includes a connecting rod and a spring 204. The connecting rod is threadedly connected to the wedge plate 203, and the base plate 202 is slidably connected to the connecting rod. The spring 204 is mounted on the connecting rod, and its two ends abut against the wedge plate 203 and the base plate 202. This structure allows the copper sleeve assembly 2 to be replaced according to the welding requirements of different module busbars, meeting the requirements for pressing the electrode surface of the cell to be welded, greatly improving the versatility of the battery module busbar welding fixture 8. Simultaneously, the connecting rod and spring 204 allow for a slidable connection between the base plate 202 and the wedge plate 203. The abutment of the two ends of the spring 204 against the wedge plate 203 and the base plate 202 provides a certain buffer during welding, ensuring that the pressure of the copper sleeve pressure head 201 on the cell electrode surface is uniform and stable, thereby protecting the cell electrode and further improving the welding qualification rate. The connecting rod has an external thread on one end of its outer wall, and a positioning hole that mates with the connecting rod is provided on the wedge plate 203. A limit piece is provided on the other end of the connecting rod to prevent the substrate 202 from detaching from the connecting rod. The connecting rod facilitates the replacement of the substrate 202, and consequently, the replacement of different copper sleeve pressure heads 201. The copper sleeve pressure head 201 has a quick-connect fitting on its side wall for allowing inert gas to flow into the interior of the copper sleeve pressure head 201.

[0034] In this embodiment, the wedge plate 203 can be moved by rotating the six-star Torx screw 107, which makes it easy to adjust the position of the wedge plate 203. The position of the wedge plate 203 can be locked by tightening the two six-star Torx screws 107.

[0035] This battery module busbar welding fixture 8 allows for quick replacement of the copper sleeve assembly 2 by simply manually turning the six-star Torx screw 107, meeting diverse welding requirements. This quick-change assembly design significantly reduces production downtime caused by replacing the copper sleeve assembly 2, improving production efficiency while reducing the high costs associated with frequent replacements of the overall pressure plate.

[0036] Furthermore, as a preferred embodiment, the dust removal assembly 3 includes a dust removal hood 301 and a dust removal pipe 302. The dust removal hood 301 is installed at the upper end of the base plate 101, and the dust removal pipe 302 passes through the reinforcing rib 104 and communicates with the interior of the dust removal hood 301 to discharge the collected dust, ensuring that each welding point can be effectively dust-free. This solves the problem that the overall pressing module cannot guarantee dust removal at each welding point, thereby improving welding quality. The dust removal pipe 302 can be connected to an external negative pressure pump through a pipeline to provide negative pressure to the dust removal hood 301, facilitating dust collection. The dust removal hood 301 can be bolted to the upper end of the base plate 101, and the reinforcing rib 104 has round holes that mate with the dust removal pipe 302.

[0037] Furthermore, as a preferred embodiment, the pressing assembly 4 includes a guide rail mounting plate 401, a ball screw 402, a motor mounting plate 403, a belt 404, and a motor 405. One side of the guide rail mounting plate 401 is provided with the ball screw 402 and a guide rail, with a slider connected to the guide rail. The nut on the ball screw is connected to the vertical plate 102. The other side of the guide rail mounting plate 401 is provided with the motor mounting plate 403, on which the motor 405 is mounted. The output end of the motor 405 is connected to the ball screw 402 via the belt 404. The screw of the ball screw 402 is provided with a belt pulley 404 that mates with the belt 404. The output end of the motor 405 is also provided with a belt pulley 404 that mates with the belt 404. When the motor 405 is working, it can drive the ball screw 402 to rotate via the belt 404, thereby causing the vertical plate 102 to move up and down. The ball screw 402 is located between the two slider mounting plates 103. In this embodiment, the precise movement of the pressing component 4 can be achieved by driving the ball screw 402 with the motor 405, ensuring consistent pressing. A guide rail is bolted to the guide rail mounting plate 401. The two ends of the screw in the ball screw are connected to the guide rail mounting plate 401 via bearing seats. The motor mounting plate 403 is welded and fixed to the other side of the guide rail mounting plate 401, and the motor 405 is bolted to the motor mounting plate 403.

[0038] Furthermore, as a preferred embodiment, the displacement detection component 5 includes an L-shaped connecting plate 501, a cable chain plate 502, a cylinder mounting plate 503, a cable chain 504, a cylinder 505, a Z-shaped sheet metal 506, a buffer mounting plate 507, a cylinder connecting block 508, and a displacement sensor 509. The L-shaped connecting plate 501 is mounted on the upper end of the guide rail mounting plate 401. The cylinder mounting plate 503 and the cable chain plate 502 are provided on the upper end of the L-shaped connecting plate 501. The cable chain 504 is provided on the cable chain plate 502. The cylinder 505 and the buffer mounting plate 507 are provided on the upper end of the cylinder mounting plate 503. The Z-shaped sheet metal 506 connects the buffer mounting plate 507 and the cable chain 504. The cylinder connecting block 508 connects the output end of the cylinder 505 and the buffer mounting plate 507. The displacement sensor 509 is provided on the side wall of the cylinder connecting block 508. A proximity switch mounting plate 510 is installed on the side wall of the cylinder mounting plate 503, and a proximity switch 511 is installed on the proximity switch mounting plate 510. A buffer 512 is installed at one end of the buffer mounting plate 507. When the piston rod of the cylinder 505 extends, it can drive the displacement sensor 509 to move. The displacement sensor 509 detects the distance to the surface to be welded, which helps to determine the descent distance of the pressing component 4, ensuring pressing accuracy and further improving welding quality. During the extension of the cylinder 505, the buffer 512 cushions and prevents the displacement sensor 509 from vibrating. The cable chain 504 is used to protect the cable of the displacement sensor 509. The cable chain plate 502 and the buffer mounting plate 507 are located on both sides of the cylinder 505. The cylinder 505 is connected to the cylinder mounting plate 503 through an L-shaped bracket, and the L-shaped bracket is bolted to the cylinder mounting plate 503. The proximity switch mounting plate 510 is located on the side of the buffer mounting plate 507 away from the cylinder 505.

[0039] The above description is only a preferred embodiment of the present utility model and does not limit the implementation and protection scope of the present utility model. Based on the above embodiments, the present utility model also discloses a laser welding device, including a battery module busbar welding fixture 8, a fixed bracket 6, and an electric cylinder 7 disposed on the upper end of the fixed bracket 6. The battery module busbar welding fixture 8 is mounted on the electric cylinder 7. Through the precise control of the electric cylinder 7, the precise positioning and movement of the battery module busbar welding fixture 8 can be realized, further improving the accuracy and stability of welding. This integrated design makes the entire laser welding device more compact, reduces the floor space, and is conducive to the overall layout of the production line equipment. Among them, a slide rail is provided on the upper end of the fixed bracket 6, and a slider that cooperates with the slide rail is fixedly provided on the other side of the guide rail mounting plate 401 in the battery module busbar welding fixture 8. The output end of the electric cylinder 7 can be connected to the side wall of the guide rail mounting plate 401 to drive the battery module busbar welding fixture 8 to move on the slide rail.

[0040] This embodiment also includes a controller, which can be a PLC controller, a microcontroller, or other controllers. The controller is used to connect to the electric cylinder 7, the external negative pressure pump, the motor 405, the displacement sensor 509, and the proximity switch 511 to control each component.

[0041] During operation, the electric cylinder 7 drives the battery module busbar welding fixture 8 to move longitudinally. Once it reaches the designated position, the pneumatic cylinder 505 operates, driving the cylinder connecting block 508 to move the buffer mounting plate 507. The buffer mounting plate 507 then moves the L-shaped connecting plate 501 and the drag chain 504. Simultaneously, the proximity switch 511 detects the position of the L-shaped connecting plate 501, thus determining whether the cylinder 505 has extended or retracted. When the cylinder 505 operates, it drives the displacement sensor 509 to move to the designated position. The displacement sensor 509 detects the distance to the surface to be welded, facilitating the determination of the descent distance of the pressing component 4. Then, the motor 405 drives the ball screw 402 to move the entire L-shaped plate assembly 1 downwards, thereby causing the copper sleeve assembly 2 to press against the busbar of the component to be welded, and the laser welding operation begins. During the welding process, the dust removal component 3 removes the dust generated during welding. When welding other positions, the pressing component 4 drives the copper sleeve component 2 to rise, and the electric cylinder 7 drives the battery module busbar welding fixture 8 to move to other positions to be welded, and then the above process is repeated until all cell terminals and busbars are welded.

[0042] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model. Those skilled in the art should realize that all solutions obtained by equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A battery module busbar welding fixture, characterized in that, The device includes an L-shaped plate assembly, a copper sleeve assembly, a dust removal assembly, a pressing assembly, and a displacement detection assembly. The dust removal assembly is located at the upper end of the L-shaped plate assembly, the copper sleeve assembly is located at the lower end of the L-shaped plate assembly, the pressing assembly is located on one side of the L-shaped plate assembly, and the displacement detection assembly is located at the upper end of the pressing assembly.

2. The battery module busbar welding fixture as described in claim 1, characterized in that, The L-shaped plate assembly includes a base plate, a vertical plate, a slider mounting plate, reinforcing ribs, and a calibration block. The vertical plate is provided at one end of the base plate, the slider mounting plate is provided on one side of the vertical plate, a slider is provided on the slider mounting plate, two reinforcing ribs are provided on both sides of the base plate, and the calibration block is provided on the other side of the vertical plate.

3. The battery module busbar welding fixture as described in claim 2, characterized in that, It also includes wedge blocks and six-star Torx screws. Two wedge blocks are provided on both sides of the base plate, and one six-star Torx screw is provided on each wedge block.

4. The battery module busbar welding fixture as described in claim 3, characterized in that, The copper sleeve assembly includes a copper sleeve pressure head, a base plate, and a wedge plate. The wedge plate is provided at the lower end of the base plate and is located between two wedge blocks. The six-star Torx screw is threadedly engaged with the wedge plate. A plurality of base plates are provided at the lower end of the wedge plate, and the copper sleeve pressure head is provided on the base plates.

5. The battery module busbar welding fixture as described in claim 4, characterized in that, It also includes a connecting rod and a spring. The connecting rod is threadedly connected to the wedge plate, and the base plate is slidably connected to the connecting rod. The spring is provided on the connecting rod, and the two ends of the spring abut against the wedge plate and the base plate.

6. The battery module busbar welding fixture as described in claim 2, characterized in that, The dust removal assembly includes a dust removal hood and a dust removal pipe. The dust removal hood is provided at the upper end of the base plate, and the dust removal pipe passes through the reinforcing rib and communicates with the interior of the dust removal hood.

7. The battery module busbar welding fixture as described in claim 2, characterized in that, The pressing assembly includes a guide rail mounting plate, a ball screw, a motor mounting plate, a belt, and a motor. The ball screw and guide rail are provided on one side of the guide rail mounting plate, the slider is connected to the guide rail, and the nut on the ball screw is connected to the vertical plate. The motor mounting plate is provided on the other side of the guide rail mounting plate, and the motor is provided on the motor mounting plate. The output end of the motor is connected to the ball screw via the belt.

8. The battery module busbar welding fixture as described in claim 7, characterized in that, The displacement detection assembly includes an L-shaped connecting plate, a cable chain plate, a cylinder mounting plate, a cable chain, a cylinder, a Z-shaped sheet metal, a buffer mounting plate, a cylinder connecting block, and a displacement sensor. The L-shaped connecting plate is mounted on the upper end of the guide rail mounting plate. The cylinder mounting plate and the cable chain plate are located on the upper end of the L-shaped connecting plate. The cable chain is mounted on the cable chain plate. The cylinder and the buffer mounting plate are located on the upper end of the cylinder mounting plate. The Z-shaped sheet metal connects the buffer mounting plate and the cable chain. The cylinder connecting block connects the output end of the cylinder and the buffer mounting plate. The displacement sensor is located on the side wall of the cylinder connecting block.

9. The battery module busbar welding fixture as described in claim 8, characterized in that, It also includes a proximity switch mounting plate, a proximity switch, and a buffer. The proximity switch mounting plate is provided on the side wall of the cylinder mounting plate, the proximity switch is provided on the proximity switch mounting plate, and the buffer is provided at one end of the buffer mounting plate.

10. A laser welding apparatus, comprising the battery module busbar welding fixture according to any one of claims 1-9, characterized in that, It also includes a fixed bracket and an electric cylinder located on the upper end of the fixed bracket, and the battery module busbar welding fixture is mounted on the electric cylinder.

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