A power battery top cover welding device

Abstract

The application discloses a power battery top cover welding device, which comprises a workbench, the top of the workbench is provided with a gantry, the gantry is provided with a welding assembly, the welding assembly is provided with a laser welding head, the workbench is provided with a connecting plate and a fixing assembly, the fixing assembly is suitable for fixing a lithium battery top cover on the connecting plate, the workbench is provided with a trial welding assembly, the trial welding assembly comprises a bottom plate, the top of the bottom plate is provided with a feeding channel, a push rod is slidably arranged in the feeding channel, a second air cylinder is arranged at the bottom of the bottom plate, the top of the feeding channel is provided with a storage pipe, a trial welding piece is arranged in the storage pipe, an air pump is arranged on the top of the push rod and close to the second air cylinder, and a gas feeding channel penetrating through the front end of the push rod is further arranged in the push rod. The power battery top cover welding device of the application is provided with a trial welding assembly and a recycling assembly, precise trial welding before welding and efficient recycling of the trial welding piece are realized, and material waste caused by improper welding position is reduced.

Description

Technical Field

[0001] This application relates to the field of electric vehicle technology, specifically to a welding device for the top cover of a power battery. Background Technology

[0002] Most existing new energy electric vehicles are powered by battery packs. Automotive batteries are mainly divided into three types: cylindrical batteries, rectangular batteries, and pouch batteries. Cylindrical and rectangular batteries are generally composed of a metal casing and a core. The metal casing includes a bottom shell and a top cover. The core is located inside the bottom shell, and the positive and negative terminals of the core are connected to the positive and negative terminals on the top cover. The welding between the top cover and the bottom shell is generally done using laser welding equipment for seamless welding. That is, the battery is placed on the welding table, and the height and horizontal movement path of the laser welding gun are controlled by a three-dimensional coordinate system to achieve battery welding.

[0003] For example, patent CN118492714A discloses a lithium battery top cover welding device. Before welding the lithium battery top cover, an ultrasonic dust removal component removes foreign objects from the battery welding position, resulting in better welding. The device also collects the foreign objects through adsorption, preventing them from affecting subsequent welding processes. At the same time, a laser rangefinder enables precise welding, and a visual inspection device can detect the lithium battery before and after welding, thereby accurately locating the foreign object and monitoring the welding effect.

[0004] In the aforementioned patent, the device is equipped with a dust removal component, which enables it to quickly remove debris from the welding position, increasing the device's practicality. However, during laser welding, due to factors such as the relative position of the weld, material properties, and laser intensity, local defects may occur after the top cover is welded. If these defects are not addressed before welding, they may affect the welding quality of the top cover. Therefore, it is necessary to provide a power battery top cover welding device that allows for pre-test welding to solve the aforementioned problems.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not constitute prior art. Summary of the Invention

[0006] Based on the aforementioned problems in the existing technology, the problem to be solved by this application is to provide a power battery top cover welding device, which can perform trial welding at the welding position before welding begins, thereby ensuring the welding quality of the top cover.

[0007] The technical solution adopted by this application to solve its technical problem is: a power battery top cover welding device, including a workbench with a gantry frame on top; a welding assembly mounted on the gantry frame, the welding assembly having a laser welding head for welding lithium battery top covers; a placement assembly mounted on the workbench, the placement assembly having a connecting plate for placing lithium battery top covers; a fixing assembly adapted to fix the lithium battery top cover to the connecting plate; and a test welding assembly including a base plate fixedly mounted on one side of the connecting plate, a material conveying channel on the top of the base plate, a push rod slidably mounted in the material conveying channel, and a second cylinder mounted on the bottom of the base plate. The output end of the second cylinder is connected to the push rod; a storage tube is provided at the top of the material conveying channel, and multiple sets of test welding pieces are installed inside the storage tube. An opening is provided at the bottom of the storage tube, and the opening is connected to the material conveying channel. The thickness of the test welding piece is the same as the thickness of the push rod, and the thickness of the push rod is adapted to the thickness of the material conveying channel. An air pump is provided at the top of the push rod near the second cylinder, and an air conveying channel with a through front end is provided inside the push rod, which is connected to the air pump. The push rod is adapted to be fixed to the test welding piece under the action of the air pump. The push rod is adapted to drive the test welding piece to or away from the welding point of the laser welding head, so as to perform test welding or recycling of the test welding piece.

[0008] Furthermore, the placement assembly includes a mounting base, which is mounted on the top of the workbench. A turntable is rotatably connected to the top of the mounting base. A rotary motor is installed inside the mounting base, and a connecting plate is mounted on the outside of the turntable.

[0009] Furthermore, the fixing component includes a mounting slot disposed on one side of the top of the connecting plate, the size of which is adapted to the size of the lithium battery casing;

[0010] Multiple sets of first cylinders are provided on the outside of the mounting groove. A pressure plate is installed on the output end of the first cylinder, and the pressure plate is in contact with the lithium battery casing.

[0011] Furthermore, a preheating component is provided on the connecting plate, the preheating component including a heating pump, the heating pump being installed on one side of the connecting plate and connected to the mounting groove.

[0012] Furthermore, a recycling component is provided on the material conveying channel, the recycling component including a discharge port located on the inner side of the material conveying channel.

[0013] Furthermore, a baffle is slidably installed at the bottom of the discharge port, and the baffle is adapted to move under the drive of a control cylinder.

[0014] Furthermore, a first trigger switch and a second trigger switch are provided on the inner side of the material conveying channel behind the discharge port. The first trigger switch and the second trigger switch are connected to the baffle and the control cylinder of the air pump through a PLC control system.

[0015] Furthermore, a locking block is provided on the front end of the push rod near the first trigger switch, and the locking block is adapted to contact the first trigger switch and the second trigger switch.

[0016] Furthermore, a recycling box can be detachably installed below the discharge port.

[0017] Furthermore, a visual inspection camera is provided on one side of the laser welding head.

[0018] The beneficial effects of this application are: The power battery top cover welding device provided by this application, by setting up a test welding component and a recycling component, realizes accurate test welding before welding and efficient recycling of test welding pieces, which not only reduces material waste caused by improper welding position, but also extends the service life of the laser welding head and significantly improves the product yield.

[0019] In addition to the purposes, features, and advantages described above, this application has other purposes, features, and advantages. A further detailed description of this application will be provided below with reference to the figures. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0021] Figure 1 This is an overall schematic diagram of a power battery top cover welding device according to this application;

[0022] Figure 2 for Figure 1 A schematic diagram showing the installation location of the components placed in the middle;

[0023] Figure 3 for Figure 2 A schematic diagram of the structure in which the components are placed;

[0024] Figure 4 for Figure 3 Schematic diagram of the structure of the fixed component;

[0025] Figure 5 for Figure 4 A side view of the fixed component.

[0026] Figure 6 for Figure 5 Schematic diagram of the pilot welding assembly;

[0027] Figure 7 for Figure 6 Enlarged view of point A in the middle;

[0028] Figure 8 for Figure 6 Schematic diagram of the installation location of the central storage pipe;

[0029] Figure 9 for Figure 8 Schematic diagram of the internal structure of the material conveying channel;

[0030] Figure 10 for Figure 9 Enlarged view of point B in the middle;

[0031] The following are the labeling elements in the figure:

[0032] 1. Laser welding table; 11. Base; 12. Workbench; 13. Gantry frame;

[0033] 2. Welding components; 21. Three-axis positioning device; 22. Laser welding head; 23. Camera; 24. Operation panel;

[0034] 3. Component placement; 31. Mounting base; 32. Turntable; 33. Connecting plate;

[0035] 4. Fixing component; 41. Mounting slot; 42. First cylinder; 43. Pressure plate;

[0036] 5. Preheating components; 51. Heat pump;

[0037] 6. Test welding assembly; 61. Base plate; 62. Material conveying channel; 63. Push rod; 64. Material storage pipe; 65. Test welding piece; 66. Second cylinder;

[0038] 7. Recycling component; 71. Air pump; 72. Discharge port; 721. Baffle; 73. First trigger switch; 731. Second trigger switch; 74. Block; 75. Recycling box. Detailed Implementation

[0039] This invention provides a welding device for the top cover of a power battery. Those skilled in the art can refer to the content of this document and appropriately modify the process parameters to achieve the desired result. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art and fall within the scope of protection of this invention. The method and application of this invention have been described through preferred embodiments. Those skilled in the art can clearly modify or appropriately change and combine the method and application described herein without departing from the content, spirit, and scope of this invention to realize and apply the technology of this invention.

[0040] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0041] Example 1: This example specifically illustrates the basic structure and working principle of a power battery top cover welding device, specifically:

[0042] like Figures 1-2 As shown, this application provides a power battery top cover welding device, including a laser welding station 1. The laser welding station 1 is installed in a lithium battery processing plant and is used to perform top cover welding processing on lithium batteries inside new energy vehicles. The laser welding station 1 includes a base 11, which is set on the ground. A worktable 12 is set on one side of the top of the base 11. A placement component 3 is set on the worktable 12. The placement component 3 is used to install the lithium battery casing and its top cover to be welded, ensuring that the two remain stable during the welding process, thereby ensuring the welding accuracy and quality. At the same time, a gantry frame 13 is set on the top of the worktable 12. A welding component 2 is installed on the gantry frame 13. The welding component 2 is used to perform welding processing on the lithium battery top cover on the placement component 3.

[0043] The welding assembly 2 includes a three-axis positioning device 21 fixedly installed on the top of the gantry frame 13. A laser welding head 22 is provided at the bottom of the three-axis positioning device 21. The laser welding head 22 is adapted to move on the gantry frame 13 under the drive of the three-axis positioning device 21 to ensure that it can accurately reach the designated welding position. At the same time, in order to further improve the accuracy and quality of welding, a visual inspection camera 23 is also provided on one side of the laser welding head 22. The camera 23 can detect the welding position of the laser in real time, promptly detect and correct welding defects, thereby ensuring that the welding quality meets the standards.

[0044] Meanwhile, to facilitate operators in monitoring and adjusting the welding process, an operation panel 24 is also provided on one side of the workbench 12. Operators can easily set and adjust the position of the laser welding head 22 through the operation panel 24 to meet the welding requirements of lithium battery top covers of different specifications.

[0045] like Figure 2 As shown, the placement component 3 includes a mounting base 31, which is fixedly mounted on the top of the workbench 12. A turntable 32 is rotatably connected to the top of the mounting base 31, and a rotary motor (not shown in the figure) is provided inside the mounting base 31. The output end of the rotary motor is fixedly mounted to the turntable 32, so that the rotary motor is suitable for driving the turntable 32 to rotate on the top of the mounting base 31, thus providing a guarantee for the subsequent position adjustment of the lithium battery component.

[0046] Meanwhile, four sets of connecting plates 33 are fixedly installed on the outside of the turntable 32. The connecting plates 33 are used to place the lithium battery components to be processed. The four sets of connecting plates 33 are symmetrically distributed, and the connecting plates 33 will rotate with the turntable 32 to move the lithium battery components on top to the welding position, thereby improving the efficiency and accuracy of the welding operation.

[0047] like Figures 3-4 As shown, a fixing component 4 is provided on the connecting plate 33. The fixing component 4 is mainly used to ensure that the lithium battery remains stable during the welding process, thereby improving the welding quality. The fixing component 4 includes a mounting groove 41, which is provided on one side of the top of the connecting plate 33. The size of the mounting groove 41 is adapted to the size of the lithium battery casing, and is used to initially install the lithium battery casing inside the connecting plate 33.

[0048] To further enhance the stability of the lithium battery during welding, multiple sets of first cylinders 42 are also provided on the outside of the mounting groove 41. A pressure plate 43 is fixedly installed on the output end of the first cylinder 42. The surface of the pressure plate 43 is specially treated to have good wear resistance and anti-slip properties. When the first cylinder 42 is started, its output end will push the pressure plate 43 towards the lithium battery shell until the pressure plate 43 contacts the lithium battery shell. Through this pressure action, the lithium battery can be effectively and tightly fixed on the connecting plate 33, ensuring that the lithium battery will not be displaced or shaken during the welding process, thereby ensuring the precision and quality of welding.

[0049] During the welding of lithium battery components, the different heat absorption capacities of different parts can lead to uneven heating. Uneven heating can cause thermal stress inside the material. When thermal stress is excessively concentrated in a local area, deformation or cracks may occur, affecting the dimensional accuracy and assembly quality of the lithium battery components and reducing the performance and safety of the lithium battery.

[0050] For this purpose, a preheating component 5 is also provided on the connecting plate 33. The preheating component 5 is used to reduce the temperature difference between the lithium battery welding area and the surrounding materials. By preheating the welding area in advance, the materials can reach a relatively uniform temperature state before welding, thereby reducing the thermal stress caused by excessive temperature difference during the welding process.

[0051] The preheating component 5 includes a heating pump 51 fixedly installed on one side of the connecting plate 33. The heating pump 51 is connected to the mounting groove 41 and is used to introduce hot air into the mounting groove 41 and heat up the gas in the mounting groove 41. After the lithium battery component is placed inside the mounting groove 41, it will be clamped by multiple sets of pressure plates 43. After the placement and fixing of the lithium battery component is completed, the heating pump 51 will start to heat the gas in the mounting groove 41 to a suitable temperature. During the heating process, the heat will be evenly transferred from the mounting groove 41 to the lithium battery component through heat conduction until the ideal preheating effect is achieved.

[0052] To achieve rapid welding of lithium batteries, the positions of the four sets of connecting plates 33 are divided into the first station, the second station, the third station and the fourth station according to the processing sequence. The first station is located on the outside of the workbench 12, which makes it easier for the staff to load the lithium battery components, effectively improving the loading efficiency and reducing the loading time.

[0053] Inside the laser welding station 1, a vision inspection instrument and a cooling air assembly (not shown in the figure) are also installed. The second station is the welding station, the third station is the inspection station, and the fourth station is the cooling station. The vision inspection instrument is installed directly above the third station. It has high-precision image acquisition and analysis capabilities and can perform comprehensive and detailed inspection of the weld when the lithium battery assembly arrives at the station. It can promptly detect possible defects in the weld, such as porosity, cracks, and lack of fusion, providing a reliable basis for controlling the welding quality. The cooling air assembly is located at the top of the fourth station. Its main function is to cool down the welded lithium battery assembly to prevent the high temperature from adversely affecting the performance of the lithium battery. It also helps to improve the safety of subsequent processing or use.

[0054] When the lithium battery top cover needs to be processed, firstly, the staff accurately places the lithium battery top cover on the top of the lithium battery shell, ensuring that the two are aligned and fit tightly. Then, the assembled lithium battery assembly is placed into the mounting groove 41. At this time, multiple sets of first cylinders 42 located outside the mounting groove 41 will drive the pressure plate 43 to move towards the lithium battery shell until the pressure plate 43 is in close contact with the lithium battery shell, ensuring that the lithium battery assembly will not be displaced or shaken during subsequent processing. Then, the heating pump 51 is started to preheat the lithium battery assembly according to the preset parameters, so that the lithium battery assembly reaches the appropriate welding temperature, reducing the thermal stress caused by temperature differences during welding and avoiding problems such as deformation or cracks.

[0055] Once the lithium battery assembly reaches the appropriate temperature, the turntable 32 starts to rotate under the drive of the rotary motor, causing the connecting plate 33 to rotate to the second work position. At this time, the lithium battery assembly will reach the welding position at the bottom of the laser welding head 22. Under the control of the PLC control system, the laser welding head 22 performs welding operations on the lithium battery assembly, realizing fast and firm welding between the top cover and the outer shell of the lithium battery.

[0056] After welding is completed, the connecting plate 33 continues to rotate, sending the lithium battery assembly to the third station. At this time, the lithium battery assembly is located at the bottom of the vision inspection instrument. Then the vision inspection instrument is activated and uses a high-definition camera to collect image information of the weld seam and detect whether there are any defects in the weld seam. Once a quality problem is found in the weld seam, the system will issue an alarm in time so that the staff can carry out subsequent processing.

[0057] After visual inspection, the connecting plate 33 rotates again, moving the lithium battery assembly to the fourth station. At this time, the cold air assembly at the fourth station is activated, blowing cold air evenly onto the welded lithium battery assembly, so that the temperature of the lithium battery assembly is quickly reduced to a safe range.

[0058] Finally, the connecting plate 33 rotates back to the initial first station. The staff takes out the welded and qualified lithium battery component and puts in a new lithium battery component to be processed. Thus, a complete lithium battery welding process cycle is completed, realizing efficient and high-quality welding processing of lithium batteries.

[0059] Example 2: During laser welding, local defects may occur after the top cover is welded due to factors such as the relative position of the weld, material properties, and laser intensity. If these defects are not addressed before welding, they may affect the welding quality of the top cover. Therefore, a test welding assembly 6 is added to the connecting plate 33. Specifically:

[0060] like Figures 4-6 and Figure 8 As shown, the test welding assembly 6 is used to perform test welding on lithium battery modules before welding work at the second station to ensure welding quality. The test welding assembly 6 includes a base plate 61 fixedly installed on one side of the connecting plate 33. A material conveying channel 62 is provided on the top of the base plate 61.

[0061] An L-shaped push rod 63 is slidably installed in the material conveying channel 62, and a second cylinder 66 is fixedly installed at the bottom of the base plate 61. The output end of the second cylinder 66 is fixed to the push rod 63, so that the push rod 63 is suitable for reciprocating within the material conveying channel 62 under the drive of the second cylinder 66.

[0062] Meanwhile, a storage tube 64 is also provided at the top of the material conveying channel 62. Multiple sets of test welding pieces 65 are installed inside the storage tube 64. The test welding pieces 65 are key consumables in the test welding process and are used to test the strength and aesthetics of the weld. The material of the test welding pieces 65 is the same as that of the lithium battery shell to be welded. A preset weld (not shown in the figure) is provided on the top of the test welding pieces 65. Openings are provided at the top and bottom of the storage tube 64. The top opening is used to feed the test welding pieces 65, while the bottom opening is connected to the material conveying channel 62 to transport the test welding pieces 65 into the material conveying channel 62. Then, the push rod 63 moves them to the welding point.

[0063] It should be noted that the thickness of the test piece 65 is the same as the thickness of the push rod 63, and the thickness of the push rod 63 is matched with the thickness of the material conveying channel 62. When the push rod 63 is in the initial state, the second cylinder 66 is in the retracted state. At this time, the push rod 63 will close the material conveying channel 62, thus preventing the test piece 65 from entering the material conveying channel 62.

[0064] When it is necessary to feed the test piece 65, the second cylinder 66 extends, which in turn drives the push rod 63 to retract. At this time, the feeding channel 62 opens, allowing the test piece 65 to move downwards under the action of gravity until the bottom test piece 65 enters the feeding channel 62. Since the thickness of the test piece 65 is the same as the thickness of the feeding channel 62, after one set of test pieces 65 enters the feeding channel 62, the remaining test pieces 65 will not continue to be fed. At this time, the second cylinder 66 retracts and drives the push rod 63 forward, which pushes the test piece 65 in the feeding channel 62 to one side of the joint between the lithium battery shell and the top cover, so that the preset weld seam is aligned with the weld seam to be welded, thus completing the feeding of the test piece 65.

[0065] like Figures 6-8 As shown, in order to enable the test piece 65 to perform continuous feeding and recycling, a recycling component 7 is also provided on the feeding channel 62. The recycling component 7 includes an air pump 71, which is fixedly installed on the top of the push rod 63. At the same time, an air supply channel (not shown in the figure) is provided inside the push rod 63 with the front end through it. The air supply channel is connected to the air pump 71, so that when the air pump 71 is pumping air, the front end of the push rod 63 will also be continuously pumped.

[0066] Meanwhile, a discharge port 72 is provided on the inner side of the material conveying channel 62. The size of the discharge port 72 is larger than the size of the test piece 65. A baffle 721 is also slidably installed at the bottom of the discharge port 72. The height of the baffle 721 is lower than that of the discharge port 72, so that there is a step between the baffle 721 and the discharge port 72. The baffle 721 is suitable for blocking or opening the discharge port 72 under the drive of an external control cylinder, so as to facilitate the subsequent recycling of the test piece 65.

[0067] Furthermore, a recycling box 75 is detachably installed below the feeding port 72, which is suitable for recycling the test welding piece 65 after the test welding is completed;

[0068] like Figures 7-10 As shown, a first trigger switch 73 is provided on the inner side of the material conveying channel 62. The first trigger switch 73 is located on the side of the material outlet 72 away from the welding area. The first trigger switch 73 is connected to the air pump 71 through the PLC control system. At the same time, a second trigger switch 731 is provided on the side of the first trigger switch 73 away from the material outlet 72. The second trigger switch 731 is connected to the control cylinder of the baffle 721 through the PLC control system. At the same time, a locking block 74 is provided on the front end of the push rod 63 near the first trigger switch 73. The locking block 74 is adapted to contact the first trigger switch 73 and the second trigger switch 731.

[0069] Before welding begins, the second cylinder 66 drives the push rod 63 forward and pushes the test welding piece 65 to move. As the movement proceeds, the clamping block 74 first contacts the second trigger switch 731. At this time, the baffle 721 moves and closes the feeding port 72. Then, the push rod 63 continues to move forward and drives the clamping block 74 to contact the first trigger switch 73. At this time, the test welding piece 65 is located above the baffle 721, and the air pump 71 starts at the same time and attracts the test welding piece 65 through the air supply channel to prevent the test welding piece 65 from shaking. Then, the test welding piece 65 will pass over the feeding port 72 under the drive of the push rod 63 and reach one side of the joint between the lithium battery shell and the top cover. At this time, the preset weld on the test welding piece 65 is aligned with the weld on the top cover of the lithium battery.

[0070] Then the test welding begins. The laser welding head 22 moves and irradiates the test welding piece 65 with laser, so that the preset weld seam on the top of the test welding piece 65 is welded. During this process, the welding effect is observed by the camera 23. If there are defects in the welding, the parameters are adjusted until the welding quality meets the requirements, thus providing time for the adjustment of laser welding and avoiding quality defects caused by direct welding of the top cover.

[0071] After the parameters are adjusted, the laser welding head 22 moves towards the lithium battery casing and top cover, moving it away from the test piece 65 and welding the lithium battery casing and top cover. At this time, the second cylinder 66 will drive the test piece 65 back through the push rod 63. Since the locking block 74 is located at the rear end of the test piece 65, when the test piece 65 returns to the top of the discharge port 72, the locking block 74 will contact the first trigger switch 73 again, thereby turning off the air pump 71 and causing the test piece 65 to stop above the baffle 721. Then the push rod 63 continues to retract, and the locking block 74 will contact the second trigger switch 731 again, causing the baffle 721 to open the discharge port 72. Since there is a step between the baffle 721 and the discharge port 72, the test piece 65 will be blocked by the step when the baffle 721 moves. Then the test piece 65 will fall into the recycling box 75 at the bottom of the discharge port 72, thus completing the recycling of the test piece 65.

[0072] It should be noted that the distance between the first trigger switch 73 and the second trigger switch 731 can be reasonably set so that the two work together to complete the above actions.

[0073] In this application, due to prolonged shutdown or initial startup, the temperature or other parameters of the laser welding head 22 may not immediately reach the optimal state. However, by setting up the trial welding component 6, the laser welding head 22 can gradually adjust its parameters and enter a stable working state during trial welding. When the laser welding head 22 officially welds the lithium battery casing and top cover, it is already performing welding processing with optimal performance and state, which can ensure the stability and consistency of welding quality and increase the quality of welding.

[0074] In summary, by setting up the test welding component 6 and the recycling component 7, this device achieves precise test welding before welding and efficient recycling of the test welding piece 65. This not only reduces material waste caused by improper welding position and extends the service life of the laser welding head 22, but also significantly improves the product yield.

[0075] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A welding device for the top cover of a power battery, characterized in that: include: Workbench (12), the top of which has a gantry (13); Welding assembly (2), which is mounted on the gantry (13), has a laser welding head (22) for welding the top cover of a lithium battery. Placement assembly (3) is disposed on the workbench (12) and has a connecting plate (33) for placing the top cover of the lithium battery. Fixing component (4), which is adapted to fix the lithium battery top cover to the connecting plate (33); The test welding assembly (6) includes a base plate (61) fixedly installed on one side of the connecting plate (33), a material conveying channel (62) is provided on the top of the base plate (61), a push rod (63) is slidably installed in the material conveying channel (62), and a second cylinder (66) is installed at the bottom of the base plate (61), the output end of the second cylinder (66) is connected to the push rod (63); The top of the material conveying channel (62) is provided with a storage pipe (64), and multiple sets of test welding pieces (65) are installed inside the storage pipe (64). The bottom of the storage pipe (64) is provided with an opening, which is connected to the material conveying channel (62). The thickness of the test welding piece (65) is the same as the thickness of the push rod (63), and the thickness of the push rod (63) is adapted to the thickness of the material conveying channel (62). An air pump (71) is provided on the top of the push rod (63) near the second cylinder (66). The push rod (63) also has a through air channel at the front end, which is connected to the air pump (71). The push rod (63) is adapted to be fixed to the test piece (65) under the action of the air pump (71). Wherein: the push rod (63) is adapted to drive the test piece (65) to or away from the welding point of the laser welding head (22) so as to perform test welding or recycling of the test piece (65).

2. The power battery top cover welding device according to claim 1, characterized in that: The placement component (3) includes a mounting base (31) which is mounted on the top of the workbench (12). A turntable (32) is rotatably connected to the top of the mounting base (31). A rotary motor is installed inside the mounting base (31). A connecting plate (33) is installed on the outside of the turntable (32).

3. The power battery top cover welding device according to claim 2, characterized in that: The fixing component (4) includes a mounting groove (41) disposed on one side of the top of the connecting plate (33), the size of which is adapted to the size of the lithium battery casing; Multiple sets of first cylinders (42) are provided on the outside of the mounting groove (41). A pressure plate (43) is installed on the output end of the first cylinder (42), and the pressure plate (43) is in contact with the lithium battery casing.

4. The power battery top cover welding device according to claim 3, characterized in that: A preheating component (5) is provided on the connecting plate (33). The preheating component (5) includes a heating pump (51). The heating pump (51) is installed on one side of the connecting plate (33) and is connected to the mounting groove (41).

5. The power battery top cover welding device according to claim 1, characterized in that: The material conveying channel (62) is provided with a recycling component (7), which includes a discharge port (72) located inside the material conveying channel (62).

6. The power battery top cover welding device according to claim 5, characterized in that: A baffle (721) is slidably installed at the bottom of the discharge port (72), and the baffle (721) is adapted to move under the drive of a control cylinder.

7. The power battery top cover welding device according to claim 6, characterized in that: The inner side of the material conveying channel (62) is provided with a first trigger switch (73) and a second trigger switch (731) located behind the discharge port (72). The first trigger switch (73) and the second trigger switch (731) are connected to the baffle (721) and the control cylinder of the air pump (71) through the PLC control system.

8. The power battery top cover welding device according to claim 7, characterized in that: A locking block (74) is provided on the front end of the push rod (63) near the first trigger switch (73), and the locking block (74) is adapted to contact the first trigger switch (73) and the second trigger switch (731).

9. The power battery top cover welding device according to claim 5, characterized in that: A recycling box (75) is detachably installed below the discharge port (72).

10. The power battery top cover welding device according to claim 1, characterized in that: A visual inspection camera (23) is provided on one side of the laser welding head (22).

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