Single cell welding device for lithium battery pack production and welding process thereof

Abstract

This invention relates to the field of lithium battery welding technology, and more particularly to a single-cell welding device and its welding process for lithium battery pack production. The device includes a worktable with a connecting arm movably mounted on its top. A welding assembly is fixedly mounted on the side wall of the connecting arm. The welding assembly includes a galvanometer laser and a laser pressure head. A support ring is fixedly mounted on the bottom of the galvanometer laser, and the laser pressure head is slidably mounted below the support ring. Rollers are rotatably mounted on the side wall of the laser pressure head. The material is filled inside a material box via a conveyor belt, reducing manual intervention and improving the accuracy of nickel sheet placement and the efficiency and effectiveness of the welding process. The rollers squeeze and limit the conveyor belt, ensuring stability between the nickel sheet and the lithium battery during welding, improving the welding effect, and avoiding problems such as incomplete welds, missed welds, and misalignment during nickel sheet welding. The conveyor belt drags the nickel sheet to inspect the welding process, ensuring that there are no incomplete or missed welds.

Description

Technical Field

[0001] This invention relates to the field of lithium battery welding technology, and in particular to a single-cell welding device and welding process for lithium battery pack production. Background Technology

[0002] With the rapid development of technology, lithium batteries, as a highly efficient energy storage device, have been widely used in many fields such as electric vehicles, portable electronic devices, and energy storage power stations. Lithium battery packs are usually composed of multiple individual cells connected in series or parallel to meet different voltage and capacity requirements. In the production process of lithium battery packs, the connection between individual cells is crucial, and nickel sheet welding is one of the common methods to achieve this connection. Existing lithium battery nickel sheet welding methods usually use galvanometer laser welding. During processing, the lithium batteries are arranged neatly and placed under the galvanometer laser, and then nickel sheets are placed one by one on the individual lithium battery cells. The top of the battery is adjusted, and the angle of the nickel sheet is then turned on. The galvanometer laser is then activated, and multiple nickel sheets are welded sequentially. After welding, the nickel sheets are pried by workers to inspect the welding. However, manually placing the nickel sheets not only reduces the efficiency of the welding process, but also requires adjusting the angle of the nickel sheets after placement to prevent them from shifting, further reducing the efficiency. In addition, inspecting the welding by prying after welding cannot inspect all the nickel sheets, further reducing the efficiency of the welding process. Furthermore, the pried-out positions of the nickel sheets will be lifted and flipped outwards, affecting the overall aesthetics of the lithium battery. Summary of the Invention

[0003] The purpose of this invention is to solve the problems in the background art by providing a single-cell welding device and welding process for lithium battery pack production.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A single-cell welding device for lithium battery pack production includes a worktable, a connecting arm movably mounted on the top of the worktable, a welding assembly fixedly mounted on the side wall of the connecting arm, the welding assembly including a galvanometer laser and a laser pressure head, a support ring fixedly mounted on the bottom of the galvanometer laser, the laser pressure head slidably mounted below the support ring, and rollers rotatably mounted on the side wall of the laser pressure head.

[0006] A filling assembly is movably installed on the outside of the connecting arm. The filling assembly includes a conveyor belt, a material box, and a flexible magnetic strip. The material box is fixedly installed on the side wall of the connecting arm. Several evenly distributed nickel sheets are placed inside the material box. The conveyor belt is sleeved on the outside of the connecting arm and passes through the material box. Several evenly distributed material troughs are opened on the side wall of the conveyor belt. The side wall of the material trough is fixedly connected to the flexible magnetic strip.

[0007] A drive assembly is movably mounted above the worktable, and the drive assembly is used to drive the movement of the connecting arm.

[0008] In the above-mentioned single-cell welding device for lithium battery pack production, the top of the laser pressure head is integrally formed with a slide rod, the slide rod is slidably inserted into the side wall of the support ring, a spring is provided between the slide rod and the support ring, a condenser lens is fixedly installed inside the support ring, and a plane mirror is fixedly installed inside the laser pressure head.

[0009] In the above-mentioned single-cell welding device for lithium battery pack production, the side wall of the connecting arm is integrally formed with a support rod, the side wall of the material box is provided with an installation hole, the installation hole is fixedly fitted to the outside of the support rod, the inside of the material box is provided with a spring push plate, the spring push plate abuts against the nickel sheet, and a pull plate is fixedly installed on the side wall of the spring push plate, the pull plate is located on the outside of the material box.

[0010] In the above-mentioned single-cell welding device for lithium battery pack production, motors are fixedly installed on the side walls of both sides of the connecting arm, and rotating rollers are fixedly connected to the output shaft of the motors. The two rotating rollers are respectively rotatably installed on both sides of the connecting arm. The rotating roller closer to the material box is the feeding roller, and the rotating roller farther away from the material box is the taking roller.

[0011] In the aforementioned single-cell welding device for lithium battery pack production, the sidewall of the material tank is integrally formed with a raised strip, and both sides of the raised strip abut against the nickel sheet.

[0012] In the above-mentioned single-cell welding device for lithium battery pack production, the sidewall of the flexible magnetic strip is integrally formed with hook teeth, and the sidewall of the hook teeth is integrally formed with plane one and plane two, both of which abut against the nickel sheet.

[0013] In the aforementioned lithium battery pack production single-cell welding device, the drive assembly includes an electric track one, an electric track two, and an electric track three. The electric track one is fixedly installed on the top of the workbench, the electric track two is slidably installed on the outside of the electric track one, the electric track three is slidably installed on the outside of the electric track two, and the connecting arm is slidably installed on the outside of the electric track three.

[0014] A single-cell welding process for lithium battery pack production, utilizing the aforementioned single-cell welding device, specifically includes the following steps: S1, Preparation: After manually arranging the lithium battery cells neatly on the worktable, the pull plate is pulled, and the spring push plate moves away from the conveyor belt. At this time, a nickel sheet is placed inside the material box, and the pull plate is released, causing the spring push plate to contact the nickel sheet towards the conveyor belt; S2, Welding Operation: The galvanometer laser and two motors are started, and the conveyor belt moves. When the material trough and the nickel sheet correspond, the nickel sheet enters the material trough and contacts the protrusion and the first plane. Simultaneously, the first plane adsorbs the nickel sheet. When the filled material trough corresponds to the laser pressure head, the motor on the side away from the material box is turned off. At this time, the drive assembly drives the galvanometer laser to move. The process aligns the nickel sheet with the electrode of the lithium battery cell. The laser pressure head presses against the conveyor belt, causing the galvanometer laser to weld the nickel sheet. Simultaneously, the nickel sheet enters the inner side of the hook teeth, where it contacts the sidewalls of the plane and the convex strip. S3, Inspection: During the welding process, the motor near the material box is always running, discharging the conveyor belt onto the lithium battery, ensuring the conveyor belt is laid on top of the lithium battery. After welding, the motor near the material box is turned off, and the motor away from the material box is started. Simultaneously, the drive assembly drives the galvanometer laser to move rapidly upward. Through the winding of the rotating roller away from the material box and the upward pulling of the connecting arm, the conveyor belt quickly moves away from the lithium battery and drags the nickel sheet. By dragging the nickel sheet with the conveyor belt, the welding condition of the nickel sheet is inspected to ensure there are no incomplete or incomplete welds.

[0015] Compared with existing technologies, the advantages of this invention are:

[0016] 1. The loading assembly, which is movably installed on the outside of the connecting arm, allows the nickel sheet to be loaded into the material box by a spring pusher plate after the material trough enters the material box and corresponds to the nickel sheet during the welding process. The nickel sheet is then filled into the material box by a conveyor belt, reducing manual intervention and improving the accuracy of nickel sheet placement and the efficiency and effect of welding.

[0017] 2. After the conveyor belt carries the nickel sheet to be laid on top of the lithium battery, as the laser pressure head moves, the rollers squeeze and limit the conveyor belt, making the nickel sheet and the lithium battery fit tightly together and enter the inside of the hook teeth. The squeezing and limiting of the conveyor belt by the rollers ensures the stability between the nickel sheet and the lithium battery during the welding process, improves the welding effect, and avoids problems such as incomplete welding, missing welding and misalignment during nickel sheet welding.

[0018] 3. After welding is completed, the inner side of the protrusion and the plane contact the nickel sheet. At this time, the motor on the side away from the material box starts, and the drive component drives the galvanometer laser to move upward quickly, so that the rotating roller on the side away from the material box can be wound up. The connecting arm pulls the conveyor belt upward, and the nickel sheet is dragged by the conveyor belt to check the welding of the nickel sheet and ensure that there are no problems with missing welds or poor welds. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle;

[0021] Figure 3 For the present invention Figure 1 Enlarged view of point B in the middle;

[0022] Figure 4 This is a cross-sectional view of the overall structure of the present invention;

[0023] Figure 5 For the present invention Figure 4 Enlarged view of point C in the middle;

[0024] Figure 6 For the present invention Figure 4 Enlarged view of point D in the middle;

[0025] Figure 7 For the present invention Figure 5 Enlarged view of point F in the middle;

[0026] Figure 8 This is a schematic diagram of the welding assembly in this invention;

[0027] Figure 9 This is a schematic diagram of the filling component in this invention;

[0028] Figure 10 This is a cross-sectional view of the structure of the nickel sheet after welding in this invention;

[0029] Figure 11 This is a cross-sectional view of the structure of the nickel sheet before welding in this invention.

[0030] In the diagram: 1. Workbench; 11. Electric track one; 12. Electric track two; 13. Electric track three; 21. Connecting arm; 211. Galvanometer laser; 212. Laser pressure head; 213. Slide bar one; 214. Roller; 215. Support rod; 216. Spring one; 217. Support ring; 218. Condenser lens; 219. Plane mirror; 22. Material box; 221. Nickel sheet; 222. Mounting hole; 223. Pull plate; 224. Spring push plate; 23. Conveyor belt; 231. Motor; 232. Rotating roller; 233. Flexible magnetic strip; 234. Hook tooth; 235. Protrusion; 236. Material trough; 237. Plane one; 238. Plane two. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0032] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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 invention.

[0033] Reference Figure 1 - Figure 11 As shown, a single-cell welding device for lithium battery pack production includes a worktable 1. A connecting arm 21 is movably mounted on the top of the worktable 1. A welding assembly is fixedly mounted on the side wall of the connecting arm 21. The welding assembly includes a galvanometer laser 211 and a laser pressure head 212. A support ring 217 is fixedly mounted on the bottom of the galvanometer laser 211. The laser pressure head 212 is slidably mounted below the support ring 217. A roller 214 is rotatably mounted on the side wall of the laser pressure head 212.

[0034] A filling assembly is movably installed on the outside of the connecting arm 21. The filling assembly includes a conveyor belt 23, a material box 22, and a flexible magnetic strip 233. The material box 22 is fixedly installed on the side wall of the connecting arm 21. Several evenly distributed nickel sheets 221 are placed inside the material box 22. The conveyor belt 23 is sleeved on the outside of the connecting arm 21 and passes through the material box 22. Several evenly distributed material troughs 236 are opened on the side wall of the conveyor belt 23. The side wall of the material trough 236 and the flexible magnetic strip 233 are fixedly connected.

[0035] A drive assembly is movably mounted above the worktable 1, which is used to drive the movement of the connecting arm 21.

[0036] like Figure 3 , Figure 6 and Figure 8 As shown, a slide rod 213 is integrally formed on the top of the laser pressure head 212. The slide rod 213 is slidably inserted into the side wall of the support ring 217. A spring 216 is provided between the slide rod 213 and the support ring 217. A condenser lens 218 is fixedly installed inside the support ring 217. A plane mirror 219 is fixedly installed inside the laser pressure head 212.

[0037] During the welding process, the roller 214 abuts against and squeezes the conveyor belt 23, making the conveyor belt 23 and the top of the lithium battery fit tightly together. The roller 214 has integrated positioning plates on both sides, and the conveyor belt 23 is located between the positioning plates on both sides of the roller 214. By limiting the conveyor belt 23 through the roller 214, the stability between the nickel sheet 221 and the lithium battery during the welding process is ensured, and the nickel sheet 221 is prevented from shifting and affecting the welding effect of the lithium battery.

[0038] like Figure 2 , Figure 5 and Figures 7-9 As shown, the side wall of the connecting arm 21 is integrally formed with a support rod 215, and the side wall of the material box 22 is provided with a mounting hole 222. The mounting hole 222 is fixedly fitted to the outside of the support rod 215. The inside of the material box 22 is provided with a spring push plate 224, which abuts against the nickel sheet 221. A pull plate 223 is fixedly installed on the side wall of the spring push plate 224, and the pull plate 223 is located on the outside of the material box 22.

[0039] The spring pusher plate 224 pushes the nickel sheet 221 towards the conveyor belt 23, so that the nickel sheet 221 fills the inside of the material trough 236. After the nickel sheet 221 inside the material box 22 is filled, the pull plate 223 is pulled, so that the spring pusher plate 224 moves away from the conveyor belt 23. At this time, the nickel sheet 221 will be filled into the inside of the material box 22 through the opening above the material box 22. The nickel sheet 221 is filled into the inside of the material box 22 by the conveyor belt 23, which reduces manual intervention and improves the accuracy of nickel sheet 221 placement and the efficiency and effect of welding processing.

[0040] like Figure 4 and Figure 9 As shown, motors 231 are fixedly installed on the side walls of both sides of the connecting arm 21. The output shaft of the motor 231 is fixedly connected to a rotating roller 232. The two rotating rollers 232 are rotatably installed on both sides of the connecting arm 21. The rotating roller 232 closer to the material box 22 is the feeding roller, and the rotating roller 232 farther away from the material box 22 is the taking-up roller.

[0041] like Figure 6 , Figure 7 , Figure 10 and Figure 11As shown, the sidewall of the material tank 236 is integrally formed with a protrusion 235, both sides of which abut against the nickel sheet 221. The sidewall of the flexible magnetic strip 233 is integrally formed with a hook tooth 234, and the sidewall of the hook tooth 234 is integrally formed with a plane 1 237 and a plane 2 238, both of which abut against the nickel sheet 221.

[0042] When the nickel sheet 221 enters the interior of the trough 236, the first plane 237 abuts against and adsorbs the nickel sheet 221, and the outer side of the protrusion 235 abuts against the nickel sheet 221. After the conveyor belt 23 carries the nickel sheet 221 to be laid on top of the lithium battery, as the laser pressure head 212 moves, the roller 214 abuts against and squeezes the conveyor belt 23, so that the nickel sheet 221 and the lithium battery are closely attached and enter the inner side of the hook tooth 234. At this time, the second plane 238 and the inner side of the protrusion 235 abut against the nickel sheet 221. Through the squeezing of the conveyor belt 23 by the roller 214, the nickel sheet 221 and the lithium battery are closely attached, improving the welding effect and avoiding the problems of false welding and missing welding after the nickel sheet 221 is welded.

[0043] Further reference Figure 6 and Figure 10 To explain, after welding is completed, the conveyor belt 23 uses the plane 238 and the convex strip 235 to embed the nickel sheet 221 into the inside of the material trough 236. At this time, the motor 231 on the side closer to the material box 22 is turned off, and the motor 231 on the side farther away from the material box 22 is started. At the same time, the drive assembly drives the galvanometer laser 211 to move upward rapidly. Through the winding of the rotating roller 232 on the side farther away from the material box 22 and the upward pulling of the connecting arm 21, the conveyor belt 23 quickly moves away from the lithium battery and drags the nickel sheet 221. By dragging the nickel sheet 221 by the conveyor belt 23, the welding condition of the nickel sheet 221 is inspected to ensure that there are no problems with missing welds or poor welds on the nickel sheet 221.

[0044] like Figure 1 and Figure 4 As shown, the drive assembly includes electric track 11, electric track 2 12 and electric track 3 13. Electric track 11 is fixedly installed on the top of the workbench 1, electric track 2 12 is slidably installed on the outside of electric track 11, electric track 3 13 is slidably installed on the outside of electric track 2 12, and connecting arm 21 is slidably installed on the outside of electric track 3 13.

[0045] Among them, the electric track 212 moves along the electric track 11 to achieve Y-axis movement during welding, the electric track 313 moves along the electric track 212 to achieve X-axis movement during welding, and the connecting arm 21 moves along the electric track 313 to achieve Z-axis movement during welding.

[0046] A single-cell welding process for lithium battery pack production, which uses the aforementioned single-cell welding device for lithium battery pack production, specifically includes the following steps: S1, Preparation: After manually arranging the lithium battery cells neatly on the workbench 1, the pull plate 223 is pulled, and the spring push plate 224 moves away from the conveyor belt 23. At this time, the nickel sheet 221 is placed inside the material box 22, and the pull plate 223 is released, so that the spring push plate 224 abuts against the nickel sheet 221 towards the conveyor belt 23. S2, Welding Operation: The galvanometer laser 211 and two motors 231 are started. The conveyor belt 23 moves. When the material trough 236 aligns with the nickel sheet 221, the nickel sheet 221 enters the interior of the material trough 236 and abuts against the protrusion 235 and the flat surface 237. Simultaneously, the flat surface 237 adsorbs the nickel sheet 221. When the filled material trough 236 aligns with the laser pressure head 212, the motor 231 on the side away from the material box 22 is turned off. At this time, the drive assembly drives the galvanometer laser 211 to move, causing... The nickel sheet 221 corresponds to the electrode of the lithium battery cell. The laser pressure head 212 squeezes the conveyor belt 23, causing the galvanometer laser 211 to weld the nickel sheet 221. At the same time, the nickel sheet 221 enters the inner side of the hook tooth 234. At this time, the nickel sheet 221 abuts against the side wall of the plane 238 and the protrusion 235. S3, Inspection: During the welding process, the motor 231 on the side near the material box 22 is always running and discharges the conveyor belt 23 to the lithium battery, so that the conveyor belt 23 is laid on top of the lithium battery. After welding is completed, the motor 231 on the side closer to the material box 22 is turned off, and the motor 231 on the side farther away from the material box 22 is turned on. At the same time, the drive component drives the galvanometer laser 211 to move upward rapidly. Through the winding of the rotating roller 232 on the side farther away from the material box 22 and the upward pulling of the connecting arm 21, the conveyor belt 23 quickly moves away from the lithium battery and drags the nickel sheet 221. By dragging the nickel sheet 221 by the conveyor belt 23, the welding condition of the nickel sheet 221 is inspected to ensure that there are no problems with missing welds or poor welds on the nickel sheet 221.

[0047] To further clarify, the aforementioned fixed connection should be interpreted broadly unless otherwise explicitly specified and limited. For example, it may be welding, gluing, or integral molding, or other conventional methods well known to those skilled in the art.

[0048] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A single-cell welding device for lithium battery pack production, comprising a workbench (1), characterized in that: A connecting arm (21) is movably mounted on the top of the workbench (1). A welding assembly is fixedly mounted on the side wall of the connecting arm (21). The welding assembly includes a galvanometer laser (211) and a laser pressure head (212). A support ring (217) is fixedly mounted on the bottom of the galvanometer laser (211). The laser pressure head (212) is slidably mounted below the support ring (217). A roller (214) is rotatably mounted on the side wall of the laser pressure head (212). A filling assembly is movably installed on the outside of the connecting arm (21). The filling assembly includes a conveyor belt (23), a material box (22), and a flexible magnetic strip (233). The material box (22) is fixedly installed on the side wall of the connecting arm (21). Several evenly distributed nickel sheets (221) are placed inside the material box (22). The conveyor belt (23) is sleeved on the outside of the connecting arm (21) and passes through the material box (22). Several evenly distributed material troughs (236) are opened on the side wall of the conveyor belt (23). The side wall of the material trough (236) and the flexible magnetic strip (233) are fixedly connected. A drive assembly is movably mounted above the workbench (1), the drive assembly being used to drive the movement of the connecting arm (21); Motors (231) are fixedly installed on the side walls of both sides of the connecting arm (21). The output shaft of the motor (231) is fixedly connected to a rotating roller (232). The two rotating rollers (232) are respectively rotatably installed on both sides of the connecting arm (21). The rotating roller (232) closer to the material box (22) is the feeding roller, and the rotating roller (232) farther away from the material box (22) is the taking-up roller. The sidewall of the feed trough (236) is integrally formed with a protrusion (235), and both sides of the protrusion (235) abut against the nickel sheet (221); The flexible magnetic strip (233) has hook teeth (234) integrally formed on its sidewall. The sidewall of the hook teeth (234) has a plane one (237) and a plane two (238) integrally formed on its sidewall. Both the plane one (237) and the plane two (238) are in contact with the nickel sheet (221).

2. The single-cell welding device for lithium battery pack production according to claim 1, characterized in that: The top of the laser pressure head (212) is integrally formed with a slide rod (213), which is slidably inserted into the side wall of the support ring (217). A spring (216) is provided between the slide rod (213) and the support ring (217). A condenser lens (218) is fixedly installed inside the support ring (217), and a plane mirror (219) is fixedly installed inside the laser pressure head (212).

3. The single-cell welding device for lithium battery pack production according to claim 2, characterized in that: The side wall of the connecting arm (21) is integrally formed with a support rod (215). The side wall of the material box (22) is provided with an installation hole (222). The installation hole (222) is fixedly fitted to the outside of the support rod (215). The inside of the material box (22) is provided with a spring push plate (224). The spring push plate (224) and the nickel sheet (221) abut against each other. The side wall of the spring push plate (224) is fixedly installed with a pull plate (223). The pull plate (223) is located on the outside of the material box (22).

4. The single-cell welding device for lithium battery pack production according to claim 3, characterized in that: The drive assembly includes electric track one (11), electric track two (12) and electric track three (13). Electric track one (11) is fixedly installed on the top of the workbench (1). Electric track two (12) is slidably installed on the outside of electric track one (11). Electric track three (13) is slidably installed on the outside of electric track two (12). The connecting arm (21) is slidably installed on the outside of electric track three (13).

5. A single-cell welding process for lithium battery pack production, characterized in that: This welding process uses a single-cell welding device for lithium battery pack production as described in claim 4, and specifically includes the following steps: S1. Preparation: After manually arranging the lithium battery cells neatly on the workbench (1), pull the pull plate (223) and move the spring push plate (224) away from the conveyor belt (23). At this time, place the nickel sheet (221) inside the material box (22) and release the pull plate (223) so that the spring push plate (224) touches the nickel sheet (221) in the direction of the conveyor belt (23). S2, Welding Operation: Start the galvanometer laser (211) and two motors (231), and the conveyor belt (23) moves. When the trough (236) and the nickel sheet (221) are aligned, the nickel sheet (221) enters the interior of the trough (236) and abuts against the protrusion (235) and the first plane (237). At the same time, the first plane (237) adsorbs the nickel sheet (221). When the filled trough (236) and the laser pressure head (212) are aligned, the laser pressure head moves away from the material box (235). 2) The motor (231) on one side is turned off. At this time, the drive assembly drives the galvanometer laser (211) to move, so that the nickel sheet (221) and the electrode of the lithium battery cell correspond to each other. The laser pressure head (212) squeezes the conveyor belt (23), so that the galvanometer laser (211) welds the nickel sheet (221). At the same time, the nickel sheet (221) enters the inside of the hook tooth (234). At this time, the nickel sheet (221) abuts against the side wall of the plane (238) and the convex strip (235). S3. Inspection work: During the welding process, the motor (231) on the side closer to the material box (22) is always running and the conveyor belt (23) is discharged to the lithium battery, so that the conveyor belt (23) is laid on top of the lithium battery. After the welding is completed, the motor (231) on the side closer to the material box (22) is turned off, and the motor (231) on the side farther away from the material box (22) is started. At the same time, the drive component drives the galvanometer laser (211) to move upward quickly. Through the winding of the rotating roller (232) on the side farther away from the material box (22) and the upward pulling of the connecting arm (21), the conveyor belt (23) quickly moves away from the lithium battery and drags the nickel sheet (221). By dragging the nickel sheet (221) through the conveyor belt (23), the welding of the nickel sheet (221) is inspected to ensure that there are no problems of missing welding or poor welding of the nickel sheet (221).

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