Alignment-free spot welding mechanism for production and processing of BMS lithium battery module components

Abstract

The alignment-free spot welding mechanism is applied to the technical field of BMS lithium battery module machining and comprises a fixed base, a limiting sliding groove is formed in the top of the fixed base, a positioning mechanism is slidably connected to the interior of the limiting sliding groove, a supporting frame is connected to the top of the fixed base in a bolted mode, and the supporting frame is connected to the top of the fixed base in a bolted mode. A spot welding mechanism used in cooperation with the positioning mechanism is installed at the bottom of the supporting frame. The lithium battery is placed at the top of the battery clamping seat, so that the four battery clamping plates can synchronously clamp the four sides of the lithium battery. As the moving distances of the battery clamping plates are the same, the lithium battery can be automatically clamped in the dead center position, and deviation in the front-back direction or the left-right direction cannot be generated. Therefore, the spot welding position of the nickel sheet does not need to be repeatedly aligned, and the production and processing efficiency of the BMS lithium battery module component is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of BMS lithium battery module processing, and in particular relates to a non-alignment spot welding mechanism for the production and processing of BMS lithium battery module components. Background Art

[0002] During the production process of existing BMS lithium battery module components, nickel sheets need to be spot welded to the electrodes of lithium batteries, thereby improving the battery life and ensuring battery performance.

[0003] At present, a Chinese invention with the publication number of CN112338411B discloses a spot welding device for lithium battery production. In the spot welding process of lithium batteries, welding needles are generally used to perform spot welding at fixed points of nickel sheets, so as to ensure the stability of the nickel sheets after spot welding, and at the same time reduce the number of spot welding positions and improve welding efficiency. However, in the existing spot welding device, when the lithium battery is placed at the bottom of the spot welder, it is difficult to align the nickel sheet with the bottom of the welding needle. The position of the lithium battery needs to be corrected several times so that the lithium battery is in the center of the processing table to ensure the alignment of the welding points. The operation is relatively troublesome, which affects the processing efficiency of lithium battery spot welding. At the same time, the welding needles of the existing spot welding devices are generally exposed to the outside, which is not only easy to be damaged, but also easy to cause sparks during the spot welding process. The safety of operation is low, and it is inconvenient to place and remove the lithium battery. Summary of the invention

[0004] The purpose of the present invention is to provide a non-alignment spot welding mechanism for the production and processing of BMS lithium battery module components. The advantage is that the placed lithium battery and the bottom of the welding pin can be quickly aligned to prevent sparks from flying during nickel sheet welding. At the same time, it is convenient to install and remove the lithium battery, thereby improving the efficiency of electric welding processing.

[0005] The above technical purpose of the present invention is achieved through the following technical solutions: a non-alignment spot welding mechanism for the production and processing of BMS lithium battery module components, including a fixed base, a limiting slide groove is provided on the top of the fixed base, a positioning mechanism is slidably connected inside the limiting slide groove, a support frame is bolted to the top of the fixed base, and a spot welding mechanism used in conjunction with the positioning mechanism is installed at the bottom of the support frame.

[0006] By adopting the above technical solution, by placing the lithium battery on the top of the battery clamping seat, the four battery clamping plates can synchronously clamp the four sides of the lithium battery. Since the battery clamping plates move the same distance, the lithium battery can be automatically clamped in the center without any deviation in the front, back or left and right directions. There is no need to repeatedly align the spot welding position of the nickel sheet, thereby improving the production and processing efficiency of the BMS lithium battery module components. When the lithium battery is driven by the battery clamping seat to move to the bottom of the spot welding protective cover, the spot welding protective cover can automatically cover the lithium battery for spot welding, thereby protecting the nickel sheet spot welding process and preventing sparks from flying out during welding. At the same time, after the spot welding is completed and the spot welding protective cover moves upward and opens, the battery clamping seat can drive the lithium battery to slide outward, thereby facilitating the installation and removal of the lithium battery and improving practicality.

[0007] The present invention is further configured as follows: the spot welding mechanism includes a driving motor bolted to one side of the top of the support frame, first threaded rods are provided on both sides of the limiting slide groove, which are respectively rotatably connected to the support frame and the fixed base, the output end of the driving motor is bolted to the top of the first threaded rod, a spot welding protective cover is provided on the top of the limiting slide groove, both ends of the surface of the spot welding protective cover are bolted to a first threaded sleeve which is threadedly connected to the first threaded rod, a rotating disk bolted to the bottom of the first threaded rod is provided inside the fixed base, a conical annular rack is fixedly sleeved on the surface of the rotating disk, a first synchronous wheel and a second synchronous wheel are respectively rotatably connected on both sides of the fixed base, the surfaces of the first synchronous wheel and the second synchronous wheel are transmission-connected with a synchronous belt, and one end of the first synchronous wheel is fixedly sleeved with a first conical gear meshing with the conical annular rack.

[0008] By adopting the above technical solution, there is no need to repeatedly align the spot welding positions of the nickel sheets, thereby improving the production and processing efficiency of BMS lithium battery module components.

[0009] The present invention is further configured as follows: the positioning mechanism includes a battery clamping seat slidingly connected to the inside of a limiting slide groove, the bottom of the battery clamping seat is bonded to the top of the synchronous belt, one side of the inside of the limiting slide groove is bolted with a linear rack, the side of the battery clamping seat close to the linear rack is rotatably connected to a disc gear meshing with the linear rack, the battery clamping seat is internally slidably sleeved with a rotating sleeve, the surface of the rotating sleeve is fixedly sleeved with a planar annular rack meshing with the side of the disc gear away from the linear rack, the top of the planar annular rack is bolted with a second bevel gear, the battery clamping seat is internally symmetrically rotatably connected with four second threaded rods, the surface of the second threaded rod is threadedly sleeved with a second threaded sleeve, the top of the second threaded sleeve is bolted with a battery clamping plate slidingly connected to the inside of the battery clamping seat, and the end of the second threaded rod close to the second bevel gear is bolted with a third bevel gear meshing with the second bevel gear.

[0010] By adopting the above technical solution, the spot welding process of the nickel sheet can be protected to prevent sparks from flying out during welding, and at the same time, the installation and removal of the lithium battery can be facilitated.

[0011] The present invention is further configured as follows: a lithium battery is arranged on the top of the battery clamping seat, and the lithium battery is clamped on the top of the battery clamping seat through a battery clamping plate.

[0012] By adopting the above technical solution, the lithium battery can be automatically clamped at the exact center without any deviation in the front-to-back or left-to-right directions, thereby improving the clamping efficiency.

[0013] The present invention is further configured as follows: a limiting groove which is slidably connected to the lithium battery is provided at the bottom of the spot welding protective cover.

[0014] The above technical solution is adopted to cover the top of the lithium battery and prevent sparks from flying out due to spot welding.

[0015] The present invention is further configured as follows: a spot welding cylinder is bolted to the top of the spot welding protective cover, a welder slidably connected to the limit groove is bolted to the output end of the spot welding cylinder, and a welding pin is fixedly connected to the bottom of the welder.

[0016] The above technical solution is adopted to place the nickel sheet on the lithium battery pole piece, and then turn on the spot welding cylinder to drive the welder to move downward, so that the welding needle contacts the welding point on the top of the nickel sheet. The high temperature generated by the current melts the welding point, so that the nickel sheet is welded on the lithium battery pole piece.

[0017] The present invention is further configured as follows: springs are bolted on both sides of the inside of the spot welding protective cover, one end of the two springs close to each other is fixedly connected to a clamping plate slidably connected to the spot welding protective cover, and one end of the two clamping plates close to each other is provided with an inclined groove.

[0018] By adopting the above technical solution, the clamping plate is pushed forward to slide by the elastic force of the spring, so that the clamping plate squeezes and clamps the nickel sheet on the lithium battery pole piece by the inclined groove to prevent position displacement during electric welding.

[0019] The present invention is further configured as follows: both sides of the battery clamping seat are rotatably connected with balls that are slidably connected to the rotating sleeve.

[0020] By adopting the above technical solution, the friction force of the rotating sleeve rotating inside the battery clamping seat is reduced, and the rotation stability is improved.

[0021] The present invention is further configured such that: an observation window is fixedly connected to one side of the surface of the spot welding protective cover.

[0022] The above technical solution makes it easy to observe the spot welding condition of the lithium battery inside the spot welding protective cover, and facilitates the operation and adjustment of the spot welding process.

[0023] The present invention is further configured as follows: the tops of the two first threaded rods are both bolted with pulleys, and the tops of the two first threaded rods are both connected with linkage belts through pulley transmission.

[0024] By adopting the above technical solution, the pulleys at the tops of the two first threaded rods are driven by a linkage belt, so that the driving motor can synchronously drive the two first threaded rods to rotate, thereby improving the lifting and sliding stability of the spot welding protective cover.

[0025] In summary, the present invention has the following beneficial effects:

[0026] 1. By placing the lithium battery on top of the battery clamping seat, the four battery clamping plates can clamp the four sides of the lithium battery synchronously. Since the battery clamping plates move the same distance, the lithium battery can be automatically clamped in the center without any deviation in the front, back, left, or right directions. This eliminates the need to repeatedly align the spot welding position of the nickel sheet, thereby improving the production and processing efficiency of BMS lithium battery module components.

[0027] 2. When the lithium battery is moved to the bottom of the spot welding protective cover by the battery clamping seat, the spot welding protective cover can automatically cover the lithium battery for spot welding, thereby protecting the nickel sheet spot welding process and preventing sparks from flying out during welding. At the same time, after the spot welding protective cover moves upward and opens after the spot welding is completed, the battery clamping seat can drive the lithium battery to slide outward, thereby facilitating the installation and removal of the lithium battery and improving practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 It is a partial structural cross-sectional view of the present invention;

[0030] Figure 3 This is a cross-sectional view of the battery clamping seat structure of the present invention;

[0031] Figure 4 This is a cross-sectional view of the spot welding protective cover structure of the present invention;

[0032] Figure 5 This is a schematic diagram of the working state of the clamping plate of the present invention;

[0033] Figure 6 It is a schematic diagram of the structure of the rotating sleeve of the present invention;

[0034] Figure 7 The present invention Figure 3 Enlarged view of point A in .

[0035] Figure numerals: 1, fixed base; 2, support frame; 3, spot welding mechanism; 301, driving motor; 302, first threaded rod; 303, first threaded sleeve; 304, spot welding protective cover; 305, rotating disk; 306, conical ring rack; 307, first synchronous wheel; 308, second synchronous wheel; 309, first bevel gear; 310, synchronous belt; 4, limit slide; 5, positioning mechanism; 501, battery clamping seat; 502, linear gear 503, disc gear; 504, rotating sleeve; 505, plane annular rack; 506, second bevel gear; 507, second threaded rod; 508, third bevel gear; 509, second threaded sleeve; 510, battery clamping plate; 6, lithium battery; 7, spot welding cylinder; 8, welding device; 9, welding needle; 10, limit groove; 11, spring; 12, clamping plate; 13, inclined groove; 14, ball bearing; 15, observation window; 16, linkage belt. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0037] Embodiment 1:

[0038] refer to Figure 1 , Figure 2 , Figure 3 , Figure 6 , Figure 7 , a non-alignment spot welding mechanism for the production and processing of BMS lithium battery module components, including a fixed base 1, a limited position slide 4 is provided on the top of the fixed base 1, a positioning mechanism 5 is slidably connected inside the limited position slide 4, a support frame 2 is bolted to the top of the fixed base 1, and a spot welding mechanism 3 used in conjunction with the positioning mechanism 5 is installed at the bottom of the support frame 2. By placing the lithium battery on the top of the battery clamping seat 501, four battery clamping plates 510 can synchronously clamp the four sides of the lithium battery. Since the battery clamping plates 510 move the same distance, the lithium battery can be automatically clamped at the center position without any deviation in the front, back or left and right directions. There is no need to repeatedly align the nickel sheet spot welding position, thereby improving the production and processing efficiency of BMS lithium battery module components. When the lithium battery is driven by the battery clamping seat 501 to move to the bottom of the spot welding protective cover 304, the spot welding protective cover 304 can automatically cover the lithium battery for spot welding, thereby protecting the nickel sheet spot welding process and preventing sparks from splashing during welding. At the same time, after the spot welding is completed, the spot welding protective cover 304 moves upward and opens, and the battery clamping seat 501 can drive the lithium battery to slide outward, thereby facilitating the installation and removal of the lithium battery and improving practicality.

[0039] refer to Figure 2 , Figure 3 , Figure 6 , Figure 7The spot welding mechanism 3 includes a driving motor 301 bolted to one side of the top of the support frame 2, and first threaded rods 302 rotatably connected to the support frame 2 and the fixed base 1 are arranged on both sides of the limiting slide 4, and the output end of the driving motor 301 is bolted to the top of the first threaded rod 302, and a spot welding protective cover 304 is arranged on the top of the limiting slide 4. Both ends of the surface of the spot welding protective cover 304 are bolted to first threaded sleeves 303 threadedly connected to the first threaded rod 302, and a rotating disk 305 bolted to the bottom of the first threaded rod 302 is arranged inside the fixed base 1, and a conical annular rack 306 is fixedly sleeved on the surface of the rotating disk 305, and a first synchronous wheel 307 and a second synchronous wheel 308 are rotatably connected on both sides of the interior of the fixed base 1, and the surfaces of the first synchronous wheel 307 and the second synchronous wheel 308 are transmission-connected with a synchronous belt 310, and one end of the first synchronous wheel 307 is fixedly sleeved with a first bevel gear 309 meshing with the conical annular rack 306. There is no need to repeatedly align the spot welding positions of the nickel sheets, which improves the production and processing efficiency of BMS lithium battery module components.

[0040] refer to Figure 1 , Figure 2 The positioning mechanism 5 includes a battery clamping seat 501 that is slidably connected to the inside of the limiting slide groove 4, the bottom of the battery clamping seat 501 is bonded to the top of the synchronous belt 310, a linear rack 502 is bolted to one side of the inside of the limiting slide groove 4, a disc gear 503 that meshes with the linear rack 502 is rotatably connected to the side of the battery clamping seat 501 close to the linear rack 502, a rotating sleeve 504 is slidably sleeved inside the battery clamping seat 501, and a disc gear 503 that meshes with the linear rack 502 is fixedly sleeved on the surface of the rotating sleeve 504. The top of the plane annular rack 505 is bolted with a second bevel gear 506, and the battery clamping seat 501 is symmetrically rotatably connected with four second threaded rods 507, and the surface of the second threaded rod 507 is threadedly sleeved with a second threaded sleeve 509, and the top of the second threaded sleeve 509 is bolted with a battery clamping plate 510 that is slidably connected to the battery clamping seat 501, and one end of the second threaded rod 507 close to the second bevel gear 506 is bolted with a third bevel gear 508 that meshes with the second bevel gear 506. The spot welding process of the nickel sheet can be protected to prevent sparks from flying out during welding, and it is convenient to install and remove the lithium battery.

[0041] refer to Figure 1 A lithium battery 6 is arranged on the top of the battery clamping seat 501, and the lithium battery 6 is clamped on the top of the battery clamping seat 501 through the battery clamping plate 510. The lithium battery can be automatically clamped at the center position without front-to-back or left-to-right deviation, thereby improving the clamping efficiency.

[0042] refer to Figure 4 , Figure 5The bottom of the spot welding protective cover 304 is provided with a limiting groove 10 which is slidably connected with the lithium battery 6. It is convenient to cover the top of the lithium battery 6 to prevent the spot welding from making the sparks splash out.

[0043] refer to Figure 2 , Figure 4 , Figure 5 The top of the spot welding protective cover 304 is bolted with a spot welding cylinder 7, the output end of the spot welding cylinder 7 is bolted with a welder 8 that is slidably connected to the limit groove 10, and the bottom of the welder 8 is fixedly connected with a welding needle 9. The nickel sheet is placed on the lithium battery pole piece, and then the spot welding cylinder 7 is turned on to drive the welder 8 to move downward, so that the welding needle 9 contacts the welding point on the top of the nickel sheet. The high temperature generated by the current is used to melt the welding point, so that the nickel sheet is welded on the lithium battery pole piece.

[0044] refer to Figure 4 , Figure 5 , springs 11 are bolted on both sides of the spot welding protective cover 304, and the ends of the two springs 11 close to each other are fixedly connected to a clamping plate 12 that is slidably connected to the spot welding protective cover 304, and the ends of the two clamping plates 12 close to each other are provided with an inclined groove 13. The elastic force of the spring 11 pushes the clamping plate 12 to slide forward, so that the clamping plate 12 squeezes and clamps the nickel sheet on the lithium battery pole piece with the inclined groove 13 to prevent position deviation during electric welding.

[0045] refer to Figure 7 The two sides of the battery clamping seat 501 are rotatably connected with the balls 14 that are slidably connected with the rotating sleeve 504. The friction force of the rotating sleeve 504 rotating inside the battery clamping seat 501 is reduced, and the rotation stability is improved.

[0046] refer to Figure 1 , Figure 2 One side of the spot welding protective cover 304 surface is fixedly connected with an observation window 15. It is convenient to observe the spot welding situation of the lithium battery inside the spot welding protective cover 304, and it is convenient to operate and adjust the spot welding process.

[0047] refer to Figure 2 The tops of the two first threaded rods 302 are both bolted with pulleys, and the tops of the two first threaded rods 302 are both connected to the linkage belt 16 through the pulley transmission. By using the linkage belt 16 to drive the pulleys at the tops of the two first threaded rods 302, the driving motor 301 can synchronously drive the two first threaded rods 302 to rotate, thereby improving the lifting and sliding stability of the spot welding protective cover 304.

[0048] Brief description of the use process: First, by turning on the drive motor 301, the linkage belt 16 is used to make the drive motor 301 synchronously drive the two first threaded rods 302 to rotate, so that the first threaded rod 302 and the first threaded sleeve 303 are threadedly engaged, and then the spot welding shield 304 is driven to slide up and down between the fixed base 1 and the support frame 2. Then, the drive motor 301 drives the first threaded rod 302 to rotate, and the bottom rotating disk 305 is synchronously driven to rotate during the rotation of the first threaded rod 302, so that the conical ring rack 306 is meshed with the first bevel gear 309, thereby driving the first synchronous wheel 307 to rotate, so that the first synchronous wheel 307 and the second synchronous wheel 308 are rotated under the linkage of the synchronous belt 310, and then the battery clamping seat 501 fixed on the top of the synchronous belt 310 is driven to slide back and forth inside the limiting slide groove 4. After the lithium battery clamped on the top of the battery clamping seat 501 is moved to the top of the spot welding protective cover 304, the spot welding protective cover 304 can automatically move downward to cover the lithium battery for spot welding. At the same time, after the spot welding is completed, the spot welding protective cover 304 moves upward and opens, and the battery clamping seat 501 can drive the lithium battery to slide outward, thereby taking the lithium battery out.

[0049] By placing the lithium battery on the top of the battery clamping seat 501, when the synchronous belt 310 drives the battery clamping seat 501 to slide inside the limiting slide groove 4, the disc gear 503 is meshed with the fixed linear rack 502, so that the disc gear 503 rotates and meshes with the plane annular rack 505 on the surface of the rotating sleeve 504, thereby driving the rotating sleeve 504 to rotate inside the battery clamping seat 501. After that, the rotating sleeve 504 drives the second bevel gear 506 on the top to rotate and mesh with the third bevel gear 508, so that the second bevel gear 506 synchronously drives the four second threaded rods 507 to rotate, and then after the second threaded rod 507 is threadedly engaged with the second threaded sleeve 509, the battery clamping plate 510 is driven to slide back and forth, so that the four sides of the lithium battery can be clamped synchronously, and the lithium battery is clamped at the center of the top of the battery clamping seat 501. Therefore, when the battery clamping seat 501 drives the lithium battery to move to the bottom of the spot welding protective cover 304, the nickel sheet on the top electrode of the lithium battery can be kept vertically positioned with the welding gun.

[0050] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A non-alignment spot welding mechanism for the production and processing of BMS lithium battery module components, comprising a fixed base (1), characterized in that: A limiting slide groove (4) is provided on the top of the fixed base (1), a positioning mechanism (5) is slidably connected inside the limiting slide groove (4), a support frame (2) is bolted to the top of the fixed base (1), and a spot welding mechanism (3) used in conjunction with the positioning mechanism (5) is installed at the bottom of the support frame (2).

2. According to claim 1, a non-alignment spot welding mechanism for the production and processing of BMS lithium battery module components is characterized in that: The spot welding mechanism (3) comprises a driving motor (301) bolted to one side of the top of the support frame (2); first threaded rods (302) rotatably connected to the support frame (2) and the fixed base (1) are arranged on both sides of the limiting slide groove (4); the output end of the driving motor (301) is bolted to the top of the first threaded rod (302); a spot welding protective cover (304) is arranged on the top of the limiting slide groove (4); both ends of the surface of the spot welding protective cover (304) are bolted to first threaded sleeves (303) threadedly connected to the first threaded rod (302); A rotating disk (305) bolted to the bottom of the first threaded rod (302) is arranged inside the fixed base (1); a conical ring rack (306) is fixedly sleeved on the surface of the rotating disk (305); a first synchronous wheel (307) and a second synchronous wheel (308) are rotatably connected on both sides of the fixed base (1); a synchronous belt (310) is transmission-connected to the surfaces of the first synchronous wheel (307) and the second synchronous wheel (308); and a first bevel gear (309) meshing with the conical ring rack (306) is fixedly sleeved on one end of the first synchronous wheel (307).

3. The alignment-free spot welding mechanism for producing and processing BMS lithium battery module components according to claim 2 is characterized in that: The positioning mechanism (5) comprises a battery clamping seat (501) slidably connected to the inside of the limiting slide groove (4); the bottom of the battery clamping seat (501) is bonded to the top of the synchronous belt (310); a linear rack (502) is bolted to one side of the inside of the limiting slide groove (4); a disc gear (503) meshing with the linear rack (502) is rotatably connected to the side of the battery clamping seat (501) close to the linear rack (502); a rotating sleeve (504) is slidably sleeved inside the battery clamping seat (501); a rotating sleeve (504) is fixedly sleeved on the surface of the rotating sleeve (504) with the disc gear (503) away from the linear rack (502). A planar annular rack (505) meshing on one side, the top of the planar annular rack (505) is bolted with a second bevel gear (506), the battery clamping seat (501) is internally symmetrically rotatably connected with four second threaded rods (507), the surface of the second threaded rod (507) is threadedly sleeved with a second threaded sleeve (509), the top of the second threaded sleeve (509) is bolted with a battery clamping plate (510) slidably connected to the inside of the battery clamping seat (501), and the end of the second threaded rod (507) close to the second bevel gear (506) is bolted with a third bevel gear (508) meshing with the second bevel gear (506).

4. The alignment-free spot welding mechanism for producing and processing BMS lithium battery module components according to claim 3 is characterized in that: A lithium battery (6) is arranged on the top of the battery clamping seat (501), and the lithium battery (6) is clamped on the top of the battery clamping seat (501) via a battery clamping plate (510).

5. The alignment-free spot welding mechanism for producing and processing BMS lithium battery module components according to claim 4, characterized in that: The bottom of the spot welding protective cover (304) is provided with a limiting groove (10) which is slidably connected to the lithium battery (6).

6. The alignment-free spot welding mechanism for producing and processing BMS lithium battery module components according to claim 5, characterized in that: The top of the spot welding protective cover (304) is bolted to a spot welding cylinder (7), the output end of the spot welding cylinder (7) is bolted to a welder (8) slidably connected to the limit groove (10), and the bottom of the welder (8) is fixedly connected to a welding needle (9).

7. The alignment-free spot welding mechanism for producing and processing BMS lithium battery module components according to claim 2, characterized in that: Springs (11) are bolted on both sides of the spot welding protective cover (304); one end of the two springs (11) close to each other is fixedly connected to a clamping plate (12) slidably connected to the spot welding protective cover (304); and one end of the two clamping plates (12) close to each other is provided with an inclined groove (13).

8. The alignment-free spot welding mechanism for producing and processing BMS lithium battery module components according to claim 3 is characterized in that: Both sides of the battery clamping seat (501) are rotatably connected to balls (14) that are slidably connected to the rotating sleeve (504).

9. The alignment-free spot welding mechanism for producing and processing BMS lithium battery module components according to claim 2, characterized in that: An observation window (15) is fixedly connected to one side of the surface of the spot welding protective cover (304).

10. The alignment-free spot welding mechanism for producing and processing BMS lithium battery module components according to claim 2, characterized in that: The tops of the two first threaded rods (302) are both bolted with pulleys, and the tops of the two first threaded rods (302) are both connected to a linkage belt (16) through the pulley transmission.

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