Battery welding tool

Abstract

The utility model discloses a battery welding frock, including base plate, moving mechanism, locating mechanism, laser welding mechanism, locating mechanism includes bearing platform, locating jig and fixture, locating jig and fixture are located the both sides of bearing platform respectively, locating jig that can move along the axial direction of bearing platform is connected to the moving mechanism, and the laser welding mechanism is connected to the moving mechanism. The movable laser welding mechanism is located at the end where the clamp is located. The positioning jig and the fixture have the advantages that the positioning jig and the fixture can guarantee that the negative collector plate is always clamped on the inner wall of the cylindrical battery shell in the welding process, and welding quality is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cylindrical battery laser welding, in particular to a welding tool for a cylindrical battery shell and a negative electrode collector plate. Background Art

[0002] In recent years, the new energy industry has developed rapidly. The large cylindrical batteries that major industry giants have focused on research and development have been widely used in various types of passenger vehicles, and there is still a large space for application development in the future. The old structure of large cylindrical batteries with rolling grooves and sealing has been basically eliminated due to the many uncontrollable factors in the process, low utilization rate of the internal structure of the battery, and the peeling of the coating on the battery rolling groove surface. The structural form of large cylindrical batteries selected by most industry giants in the research and development is mostly laser welding. The laser welding technology of large cylindrical batteries is still under development. The quality of its laser welding directly affects the performance and stability of the cylindrical battery, especially in the existing cylindrical battery manufacturing process. The stability of the laser welding of the negative electrode collector and the cylindrical battery shell will directly affect the quality of laser welding. The reason is that the first negative electrode collector is a small component with high requirements for welding action, and the strength of the welding must also be controlled to a certain extent. If the welding strength is too large, it will be welded through, and if the strength is too small, it will not be able to complete the consolidation. Second, the positioning of the negative collector plate on the inner wall of the cylindrical battery shell is still achieved by manual positioning and compaction. However, the manual positioning and compaction method has the problem of great positioning difficulty, and after the negative collector plate is manually positioned and compacted on the inner wall of the cylindrical battery shell, the negative collector plate will be subject to a certain rebound force, causing the position of the negative collector plate to shift to a certain extent, and at the same time causing a certain gap between the negative collector plate and the cylindrical battery shell. Both of the above conditions will result in poor laser welding effects, and even welding failure will lead to battery scrapping, which will directly affect the subsequent battery production process.

[0003] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the utility model, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art known to ordinary technicians in this field. Utility Model Content

[0004] The technical problem to be solved by the utility model is: how to solve the problem that when a cylindrical battery shell and a current collector are welded, the fixing strength between the shell and the current collector is insufficient, resulting in poor welding effect.

[0005] The utility model solves the above technical problems through the following technical means:

[0006] A battery welding tool comprises a base plate, a moving mechanism, a positioning mechanism, and a laser welding mechanism. The positioning mechanism comprises a supporting platform, a positioning jig, and a fixture. The positioning jig and the fixture are respectively located on both sides of the supporting platform. The positioning jig that can move axially along the supporting platform is connected to the moving mechanism. The movable laser welding mechanism is located at the end where the fixture is located.

[0007] The utility model ensures that the battery shell can be positioned and rotated through a bearing platform, and the positioning jig moves to the clamp through a moving mechanism. The positioning jig and the clamp can ensure that the negative electrode collector plate is always clamped on the inner wall of the cylindrical battery shell during welding, effectively improving the welding quality; the laser welding mechanism is used for welding and ensures the welding effect.

[0008] Preferably, the moving mechanism includes a cylinder, a mobile mounting seat, and a slide rail, the fixed end of the cylinder is connected to the base plate, the telescopic end of the cylinder is connected to the mobile mounting seat, the slide rail is connected to the base plate, the telescopic end of the cylinder is connected to the mobile mounting seat, and the bottom of the mobile mounting seat is slidably connected to the slide rail.

[0009] The cylinder can move the movable mounting seat horizontally, thereby adjusting the position of the positioning jig on the movable mounting seat, making it easier for the positioning jig to move to a specified position, thereby cooperating with the clamp to clamp the negative electrode collector plate and the cylindrical battery shell. The length of the slide rail and the telescopic end of the cylinder can be selected according to the length of different cylindrical batteries to improve adaptability.

[0010] The telescopic end of the cylinder may also be provided with additional telescopic rods or other components that can achieve telescopic extension.

[0011] Preferably, the cylinder is located on one side of the positioning jig, and the cylinder is arranged in parallel with the positioning jig.

[0012] Preferably, the positioning mechanism further comprises a rotating motor and a driving bearing. The rotating motor is connected to the moving mechanism, an end of the rotating motor is connected to the driving bearing, and the other end of the driving bearing is detachably connected to the positioning jig.

[0013] Preferably, the inner cavity of the positioning jig is cylindrical.

[0014] Preferably, the end of the clamp is adapted to the shape of the collecting plate.

[0015] The rotation angle of the rotating motor is 0-90 degrees. The rotating motor can improve the welding efficiency of the cylindrical battery shell 5 and the negative electrode collector plate by reciprocating rotation; the rotating motor provides high-precision rotational kinetic energy, the driving bearing is a high-precision bearing that rotates stably without shaking, the inner cavity of the positioning jig is a circular cavity that fits the cylindrical battery well without slipping, and the diameter can be designed according to the diameter of the cylindrical battery. The combination of the three structures can drive the cylindrical battery to rotate.

[0016] Preferably, the supporting platform includes two cylindrical silicone bodies, which are arranged at intervals to form a V-shaped supporting space for the cylindrical battery, and the two cylindrical silicone bodies are rotatably connected to a silicone body mounting frame, and the silicone body mounting frame is connected to the base plate.

[0017] Preferably, the supporting platform further comprises a distance sensor, the distance sensor is connected to the bottom plate via a sensor mounting seat, and the distance sensor is located on one side of the cylindrical silicone body.

[0018] The cylindrical silicone body is made of silicone material without damaging the battery shell. The distance sensor is a high-precision light distance sensor that can accurately sense whether the battery is placed on the carrier. The shape of the fixture is customized according to the shape of the current collecting plate to facilitate tightening the current collecting plate and the inner wall of the shell. Since the negative electrode current collecting plate is mostly made of copper, the fixture is selected from the same material as much as possible to avoid different metal particles appearing during welding that affect battery performance.

[0019] Preferably, the laser welding mechanism comprises a laser welding head, a nitrogen nozzle and a dust suction head, wherein the laser welding head is connected to a welding head mounting frame so as to be movable up and down, the nitrogen nozzle can be moved toward a fixture position, and the dust suction head can be moved toward a fixture position.

[0020] The welding laser head is a pulsed laser transmitter with stable welding energy, and it is not easy to have over-welding and cold welding. The nitrogen nozzle will spray nitrogen during welding to cool the welding area to ensure the welding effect. The vacuum head is used for dust removal during welding to prevent welding explosion points.

[0021] The laser welding head and the negative electrode current collector form an acute angle of 25 to 35 degrees. Within this angle range, the welding strength will not be too small to cause the cylindrical battery shell and the negative electrode current collector to be loosely bonded.

[0022] Preferably, the laser welding head is on the same side as the fixture, and the nitrogen nozzle and the vacuum head are located on both sides of the fixture.

[0023] The laser welding head, combined with nitrogen cooling and a high-efficiency dust suction head, can accurately align the welding position between the clamped negative electrode collector plate and the cylindrical battery shell, weld the two together and ensure welding stability to improve welding quality.

[0024] Preferably, the wedge block mechanism is connected to the base plate and is located on the side of the fixture, and a wedge opening is provided on the side of the mounting end of the fixture. The wedge block mechanism is engaged with the wedge opening when not welded and is disengaged from the wedge opening when welding.

[0025] The fixture has a regular shape. When welding starts, the laser has an initial position that needs to be connected to the fixture mounting end at the rear end of the fixture, so that the fixture is fixed and the angle is consistent when not welding. During welding, the wedge will be loosened to allow the fixture to rotate smoothly for welding. After welding is completed, the wedge will support the fixture.

[0026] The advantages of the utility model are:

[0027] (1) The utility model ensures that the battery housing can be positioned and rotated by means of a carrier, and the positioning jig moves toward the fixture through a moving mechanism. The positioning jig and the fixture can ensure that the negative electrode collector is always clamped on the inner wall of the cylindrical battery housing during welding, thereby effectively improving the welding quality; the laser welding mechanism is used for welding and ensures the welding effect;

[0028] (2) The rotation angle of the rotating motor is 0-90 degrees. The rotating motor can improve the welding efficiency of the cylindrical battery housing 5 and the negative electrode collector plate by reciprocating rotation; the rotating motor provides high-precision rotational kinetic energy, the driving bearing is a high-precision bearing that rotates stably without shaking, the inner cavity of the positioning jig is a circular cavity that fits the cylindrical battery well without slipping, and the diameter can be designed according to the diameter of the cylindrical battery. The three structures can drive the cylindrical battery to rotate;

[0029] (3) The cylindrical silicone body is made of silicone material without damaging the battery shell. The distance sensor is a high-precision light distance sensor that can accurately sense whether the battery is placed on the cylindrical silicone body. The shape of the fixture is customized according to the shape of the collector plate to facilitate tightening the collector plate and the inner wall of the shell. Since the negative electrode collector plate is mostly made of copper, the fixture is made of the same material as much as possible to avoid different metal particles during welding that affect battery performance;

[0030] (4) The welding laser head is a pulsed laser transmitter with stable welding energy and is not prone to over-welding and cold welding. The nitrogen nozzle will spray nitrogen during welding to cool the welding area to ensure the welding effect. The vacuum head is used to remove dust during welding to prevent welding explosion points.

[0031] (5) The laser welding head and the negative electrode current collector form an acute angle of 25 to 35 degrees. Within this angle range, the welding strength will not be too low, resulting in a loose bond between the cylindrical battery housing and the negative electrode current collector. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the structure of a battery welding tooling according to an embodiment of the utility model;

[0033] Figure 2 This is a schematic diagram of the structure of a battery welding tooling according to an embodiment of the utility model;

[0034] Figure 3 It is a structural schematic diagram of a battery welding tool (with product) according to an embodiment of the utility model;

[0035] Figure 4 It is a structural schematic diagram of a battery welding tool (with product) according to an embodiment of the utility model;

[0036] Figure 5 It is a structural schematic diagram of the wedge mechanism of the embodiment of the utility model;

[0037] Figure 6 It is a structural schematic diagram of the wedge mechanism of the embodiment of the utility model;

[0038] Numbers in the figure:

[0039] 1. Bottom plate;

[0040] 2. Moving mechanism; 21. Cylinder; 22. Telescopic rod; 23. Slide rail; 24. Moving mounting seat;

[0041] 3. Positioning mechanism; 31. Positioning jig; 32. Fixture; 33. Carrying platform; 34. Rotating motor; 35. Driving bearing; 36. Distance sensor; 321. Fixture mounting end; 322. Wedge;

[0042] 4. Laser welding mechanism; 41. Laser welding head; 42. Nitrogen nozzle; 43. Dust removal head;

[0043] 5. Negative electrode of cylindrical battery;

[0044] 6. Wedge mechanism; 61. Wedge cylinder; 62. Wedge body; DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0046] Embodiment 1:

[0047] like Figure 1 As shown, the battery welding tool comprises a base plate 1, a moving mechanism 2, a positioning mechanism 3, and a laser welding mechanism 4;

[0048] Specifically, the base plate 1 is used as a mounting base for other components, and the shape, bolt hole positions, etc. can be selected according to the installation requirements.

[0049] like Figure 1 , Figure 2 As shown, the mobile mechanism 2 includes a cylinder 21, a telescopic rod 22, a slide rail 23, and a mobile mounting seat 24. The fixed end of the cylinder 21 can be connected to the base plate 1 through a cylinder fixing bracket, the telescopic end of the cylinder 21 is connected to the telescopic rod 22, and the other end of the telescopic rod 22 is connected to the mobile mounting seat 24. The slide rail 23 is connected to both sides of the base plate 1, and the two sides of the bottom of the mobile mounting seat 24 are slidably connected to the slide rail 23.

[0050] The cylinder 21 is located at one side of the positioning jig 31, and the cylinder 21 is arranged in parallel with the positioning jig 31. The length of the entire welding tool can be shortened.

[0051] The cylinder 21 can horizontally move the mobile mounting seat 24, thereby adjusting the position of the positioning jig 31 on the mobile mounting seat 24, so as to facilitate the positioning jig 31 to move to the specified position, so as to cooperate with the clamp 32 to clamp the negative electrode collector plate and the cylindrical battery housing 5, wherein the length scale of the slide rail 23 and the telescopic rod 22 and the specifications of the cylinder 21 can be selected according to the length of different cylindrical batteries to improve adaptability. The telescopic rod 22 is connected to the mobile mounting seat 24 and the cylinder 21 by bolts.

[0052] The movable mounting seat 24 is a plate-like structure, and a slide groove capable of sliding with the slide rail 23 is arranged at the bottom. The shapes of the slide groove and the slide rail 23 can be concave-convex or dovetail groove, and a structure capable of achieving stable sliding is preferred.

[0053] The positioning mechanism 3 includes a positioning jig 31, a fixture 32, a carrier platform 33, a rotating motor 34, and a driving bearing 35. The positioning jig 31 and the fixture 32 are respectively located on both sides of the carrier platform 33. The positioning jig 31 is connected to the moving mechanism 2. The positioning jig 31 can move axially along the carrier platform 33 under the action of the moving mechanism 2. The rotating motor 34 is connected to the moving mounting seat 24 of the moving mechanism 2. The end of the rotating motor 34 is connected to the driving bearing 35. The other end of the driving bearing 35 is detachably connected to the positioning jig 31.

[0054] Specifically, the positioning jig 31 can accurately position the cylindrical battery housing 5 . The inner cavity of the positioning jig 31 is a circular cavity, which can achieve a good fit with the cylindrical battery housing 5 without slipping, and the diameter of the inner cavity can be designed according to the diameter of the cylindrical battery housing 5 .

[0055] The fixture 32 is made of copper, with a circular front end, a cylindrical rear end and a threaded end, which is used to be installed on a fixed seat for easy replacement; or the fixture 32 can also be set in a movable manner, such as by a hydraulic cylinder, a pneumatic cylinder, etc. to realize the movement of the fixture 32 to the positioning jig 31. The end of the fixture 32 is adapted to the shape of the collector plate. After the positioning jig 31 and the fixture 32 position the cylindrical battery, the fixture 32 can ensure that the negative collector plate is always clamped on the inner wall of the cylindrical battery shell 5 during the welding process. The shape of the fixture 32 is customized according to the shape of the collector plate to facilitate the tightening of the collector plate and the inner wall of the shell. Since the negative collector plate is mostly made of copper, the fixture 32 is selected from the same material as much as possible to avoid different metal particles appearing during welding and affecting the battery performance.

[0056] In this embodiment, the rotation angle of the rotating motor 34 is 0-90 degrees. The rotating motor 34 can improve the welding efficiency between the cylindrical battery shell 5 and the negative electrode collector plate by reciprocating rotation; the rotating motor 34 provides high-precision rotational kinetic energy, and the driving bearing 35 is a high-precision bearing that rotates stably without shaking.

[0057] The support platform 33 includes two cylindrical silicone bodies, which are arranged at intervals to form a V-shaped support space for the cylindrical battery. The two cylindrical silicone bodies are rotatably connected to a silicone body mounting frame, and the silicone body mounting frame is connected to the base plate 1.

[0058] The support platform 33 further includes a distance sensor 36 , which is connected to the bottom plate 1 via a sensor mounting seat. The distance sensor 36 is located on one side of the cylindrical silicone body.

[0059] The cylindrical silicone body is made of silicone material so as not to damage the cylindrical battery housing 5. The distance sensor 36 is a high-precision light distance sensor that can accurately sense whether the cylindrical battery housing 5 is placed on the cylindrical silicone body.

[0060] In this embodiment, the support platform 33 is used to ensure that the cylindrical battery shell 5 can be positioned and rotated. The positioning jig 31 is moved to the clamp 32 through the moving mechanism. The positioning jig 31 and the clamp 32 can ensure that the negative electrode collector plate is always clamped on the inner wall of the cylindrical battery shell 5 during welding, effectively improving the welding quality; the laser welding mechanism is used for welding and ensures the welding effect.

[0061] Embodiment 2:

[0062] like Figure 1-Figure 4As shown, on the basis of the first embodiment, the laser welding mechanism 4 includes a laser welding head 41, a nitrogen nozzle 42, and a dust suction head 43. The laser welding head 41 is connected to the welding head mounting frame so as to be movable up and down, the nitrogen nozzle 42 is movable toward the position of the fixture 32, and the dust suction head 43 is movable toward the position of the fixture 32. The laser welding head 41 is on the same side as the fixture 32, and the nitrogen nozzle 42 and the dust suction head 43 are located on both sides of the fixture 32.

[0063] The laser welding head 41 is a pulsed laser transmitter with stable welding energy and is not prone to over-welding and cold welding. The nitrogen nozzle 42 will spray nitrogen during welding to cool the welding area to ensure the welding effect. The dust suction head 43 is used for dust removal during welding to prevent welding explosion points.

[0064] In this embodiment, the laser welding head 41 forms an acute angle of 25 to 35 degrees with the negative electrode collector. Within this angle range, the welding strength will not be too low, resulting in a loose consolidation between the cylindrical battery housing 5 and the negative electrode collector. The laser welding head 41, in conjunction with nitrogen cooling and a high-efficiency dust collector head 43, can accurately align the welding position between the clamped negative electrode collector and the cylindrical battery housing 5, and weld the two together while ensuring welding stability and improving welding quality.

[0065] The working process of this embodiment:

[0066] like Figure 3 As shown, first, the cylindrical battery shell 5 equipped with the negative electrode collector disk is manually placed on two cylindrical silicone bodies, and the negative electrode collector disk is fitted with the fixture 32. The equipment can be started normally only after the distance sensor 36 senses the existence of the cylindrical battery shell 5. After starting the equipment, the cylinder 21 drives the telescopic rod 22 to retract horizontally in the direction close to the fixture 32. The telescopic rod 22 drives the movable mounting seat 24 and the rotating motor 34, the driving bearing 35 and the positioning fixture 31 installed on the movable mounting seat 24 to move horizontally to the right. After the positioning fixture 31 contacts the cylindrical battery shell 5, it covers the cylindrical battery shell 5 and moves toward the fixture 32 until the cylindrical battery shell 5 and the negative electrode collector disk are tightly fitted with the fixture 32 and then stops moving.

[0067] When the positioning jig 31 moves and positions the cylindrical battery housing 5, there are two limit blocks on the travel path of the movable mounting seat 24 to prevent the risk of excessive pressure in the cylinder 21 damaging the cylindrical battery housing 5 and squeezing the negative electrode collector plate.

[0068] After the movement of the moving mechanism 2 and the positioning mechanism 3 is completed, the rotating motor 34 starts the driving bearing 35 to rotate in one direction. The driving bearing 35 is connected to the positioning jig 31 with bolts. The driving bearing 35 drives the cylindrical battery shell 5 covered by the positioning jig 31 to rotate. At the same time, the laser welding head 41 emits laser for welding. Similarly, during welding, the nitrogen nozzle 42 sprays nitrogen and the dust suction head 43 starts to vacuum. When the welding is completed, the rotating motor 34 stops working, the driving bearing 35 and the positioning jig 31 stop rotating, and the cylinder 21 drives the telescopic rod 22 to extract. The telescopic rod 22 returns to the left horizontal direction with the mobile mounting seat 24 and the positioning mechanism 3 installed on the mobile mounting seat 24, and then the welded battery can be manually removed.

[0069] The laser welding head 41 can calculate the laser welding trajectory according to the welding position of the negative electrode collector and the cylindrical battery shell 5, and the rotating motor 34, the driving bearing 35 and the positioning fixture 31 work together to complete the path of the laser welding trajectory, and finally complete the welding operation of the negative electrode collector and the cylindrical battery shell 5. The rotating motor 34 can also drive the bearing to perform continuous clockwise or counterclockwise rotation or reciprocating rotation. The laser generator of the laser welding head 41 can be selected as a pulsed or continuous laser generator according to the shape and material of the negative electrode collector. The nitrogen nozzle is equipped with a regulating valve to adjust the nitrogen flow rate to achieve the best protection effect.

[0070] The welding device for the cylindrical battery housing 5 and the negative electrode collector in this embodiment can firmly position the cylindrical battery housing 5 and the negative electrode collector. After positioning, the negative electrode collector is clamped on the inner wall of the cylindrical battery housing 5 and can accurately weld the welding position of the negative electrode collector and the cylindrical battery housing 5, with good welding effect. The function of this device is to automatically stick and rotate, and the temperature is balanced during welding, the amount of metal dust is small, and the efficiency and accuracy are not affected, which saves time and improves the welding stability and yield.

[0071] Embodiment three:

[0072] like Figure 5 , Figure 6 As shown, this embodiment further includes a wedge mechanism 6, which is connected to the bottom plate 1 and located on the side of the fixture 32. A wedge opening 322 is provided on the side of the fixture installation end 321 of the fixture 32. The wedge mechanism 6 is engaged with the wedge opening 322 when not welded and is disengaged from the wedge opening 322 when welded. The front end of the wedge mechanism 6 is adapted to the shape and size of the wedge opening 322.

[0073] Specifically, the wedge mechanism 6 includes a wedge cylinder 61 and a wedge body 62. The wedge cylinder 61 can be connected to the base plate 1 through a fixing block so that the horizontal axis of the wedge cylinder 61 is roughly flush with the radial direction of the fixture mounting end 321, and the wedge body 62 is mounted on the end of the wedge cylinder 61. Figure 5 As shown, when welding is not in progress, the wedge block cylinder 61 moves the wedge block body 62 horizontally into the wedge opening 322 to ensure that the fixture 32 cannot move. Figure 6 As shown, when welding is required, the wedge cylinder 61 is actuated to retract the wedge body 62 horizontally and disengage it from the wedge opening 322 .

[0074] Therefore, the fixture 32 has a regular shape. When welding starts, the laser has an initial position that needs to be engaged with the fixture mounting end 321 at the rear end of the fixture, so that the fixture 32 is fixed and the angle is consistent when not welded. During welding, the wedge block body 62 will be loosened to allow the fixture 32 to rotate smoothly for welding. After welding is completed, the wedge block will support the fixture 32 to ensure the consistency of welding.

[0075] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. Battery welding tool, characterized in that: It includes a base plate, a moving mechanism, a positioning mechanism, and a laser welding mechanism. The positioning mechanism includes a supporting platform, a positioning jig, and a fixture. The positioning jig and the fixture are respectively located on both sides of the supporting platform. The positioning jig that can move along the axial direction of the supporting platform is connected to the moving mechanism. The movable laser welding mechanism is located at the end where the fixture is located.

2. The battery welding tool according to claim 1, characterized in that: The moving mechanism includes a cylinder, a mobile mounting seat, and a slide rail. The fixed end of the cylinder is connected to the base plate, the telescopic end of the cylinder is connected to the mobile mounting seat, the slide rail is connected to the base plate, the telescopic end of the cylinder is connected to the mobile mounting seat, and the bottom of the mobile mounting seat is slidably connected to the slide rail.

3. The battery welding tool according to claim 2, characterized in that: The cylinder is located at one side of the positioning jig, and the cylinder is arranged in parallel with the positioning jig.

4. The battery welding tool according to claim 1, characterized in that: The positioning mechanism further includes a rotating motor and a driving bearing. The rotating motor is connected to the moving mechanism, an end of the rotating motor is connected to the driving bearing, and the other end of the driving bearing is detachably connected to the positioning jig.

5. The battery welding tool according to claim 1, characterized in that: The inner cavity of the positioning jig is cylindrical.

6. The battery welding tool according to claim 1, characterized in that: The end of the clamp is adapted to the shape of the collecting plate.

7. The battery welding tool according to claim 1, characterized in that: The supporting platform includes two cylindrical silicone bodies, which are arranged at intervals to form a V-shaped supporting space for the cylindrical battery. The two cylindrical silicone bodies are rotatably connected to a silicone body mounting frame, and the silicone body mounting frame is connected to the bottom plate.

8. The battery welding tool according to claim 7, characterized in that: The supporting platform also includes a distance sensor, which is connected to the bottom plate through a sensor mounting seat, and the distance sensor is located on one side of the cylindrical silicone body.

9. The battery welding tool according to claim 1, characterized in that: The laser welding mechanism includes a laser welding head, a nitrogen nozzle, and a dust suction head. The laser welding head is connected to a welding head mounting frame and can be moved up and down. The nitrogen nozzle can be moved toward a fixture position, and the dust suction head can be moved toward a fixture position. The laser welding head is on the same side as the fixture, and the nitrogen nozzle and the dust suction head are located on both sides of the fixture.

10. The battery welding tool according to claim 1, characterized in that: It also includes a wedge mechanism, which is connected to the base plate and located on the side of the fixture. A wedge opening is provided on the side of the mounting end of the fixture. The wedge mechanism is engaged with the wedge opening when not welded and is disengaged from the wedge opening when welded.

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