A welding positioning fixture for lithium-ion battery tabs

Abstract

This invention relates to the field of battery tab welding technology, and more specifically, to a welding positioning fixture for lithium-ion battery tabs, comprising: an octagonal sleeve fixedly mounted on the outside of a welding tube; a collar slidably connected to the outside of the sleeve; a limiting component mounted on the top of the sleeve to restrict the sliding of the collar; a support plate rotatably connected to the outside of the collar; a self-locking component disposed between the support plate and the collar; a splash guard assembly disposed at the bottom edge of the support plate; a support cover disposed at the bottom of the splash guard assembly; a positioning component disposed inside the support cover; and a pressing component disposed at the bottom of the support plate to prevent welding misalignment. This invention allows for rapid adjustment and limitation of the welding height of the welding tube, adapting to welding tabs and terminals of different materials, quickly centering misaligned terminals to prevent welding offset, and stably pressing down on the terminals during welding to prevent the stability of the terminals from being affected by the melting of the welding tabs.

Description

Technical Field

[0001] This invention relates to the field of battery tab welding technology, and more specifically, to a welding positioning fixture for lithium-ion battery tabs. Background Technology

[0002] Lithium-ion batteries are mainly divided into three types: cylindrical batteries, pouch batteries, and prismatic hard-case batteries. Among them, prismatic hard-case batteries play an extremely important role in the field of lithium-ion batteries, especially in the fields of power batteries and high-end energy storage.

[0003] The tabs of a square hard-shell battery serve as the window connecting the inside of the cell to the outside world. They need to be welded to the terminals to achieve a low-resistance, highly reliable electrical connection with the external circuit.

[0004] For welding the tabs and posts, a laser welding machine is required. During welding, two situations generally occur.

[0005] One method requires manually placing the electrode post at the center of the top of the electrode tab and using a pressure bar to hold down the top of the electrode post. When the welding tube of the laser welding machine is performing horizontal circumferential welding, the pressure bar held by the operator also needs to rotate with the movement of the welding tube to prevent the pressure bar from obscuring the welding area between the electrode tab and the electrode post, thus affecting the continuity of the welding.

[0006] Another method is to use mechanical feeding, placing the electrode post at the center of the top of the tab, without using clamping means to tightly hold the electrode post and the tab, and directly performing laser welding.

[0007] Both of these welding operations for tabs and poles have certain drawbacks: 1. During manual placement of the pole, there is a lack of components for centering the pole. While the laser welding tube has an automatic positioning function that can automatically identify the circumferential trajectory to be welded on the tab, the pole may become misaligned during manual loading, causing it to shift off the welding area. This results in the welded pole failing to properly connect with the electrical equipment. Furthermore, because the laser welding tube requires translational circumferential welding, manual pressing with a pressure bar enhances the stability of the pole welding, but workers must constantly monitor the pressure bar's synchronous rotation with the welding tube. Otherwise, the laser may strike the pressure bar, damaging it and causing incomplete welds, affecting the welding quality. When mechanical automatic loading is used, although the pole centering problem is solved, the pole lacks clamping and fixing during welding. The welding area between the tab and pole undergoes melting and expansion / contraction during welding. Without stable downward pressure to fix the pole, it may shift during welding.

[0008] 2. Due to the different materials of the tabs and posts of the positive and negative electrodes in directional hard-shell batteries, the tabs and posts of the positive electrode are mostly made of aluminum, while those of the negative electrode are mostly made of copper. When performing laser welding, it is necessary to adjust the welding distance for different materials to prevent different melting depths of the tabs and posts at the same welding depth due to material issues. The existing welding positioning fixtures for welding lithium-ion battery tabs lack components that can adjust the downward pressure distance of the welding tube. This makes it impossible to quickly adjust the distance between the welding head and the welding point when welding different materials. As a result, when welding tabs and posts of different materials, the fixture needs to be disassembled and reassembled, lacking the flexibility of adjustment. Summary of the Invention

[0009] To address the aforementioned technical problems, this invention provides a welding positioning fixture for lithium-ion battery tabs, comprising: a polygonal sleeve fixedly installed on the outside of a welding tube; a collar slidably connected to the outside of the sleeve; a limiting component installed on the top of the sleeve; a support plate rotatably connected to the outside of the collar; a locking component installed on the top of the support plate; a splash guard installed on the bottom of the support plate; a support cover installed on the bottom of the splash guard; a positioning component installed on the bottom of the support cover; and a pressing component installed on the bottom of the support plate.

[0010] The locking component is a spring rod that is fixedly installed on the top of the support plate. One end of the spring rod is hemispherical, and a hemispherical slot is provided on one side of the collar.

[0011] The positioning component includes a storage compartment at the bottom of the support cover, side "V"-shaped guide rails fixedly connected to the inner walls of both sides of the storage compartment, "L"-shaped positioning rods slidably connected between the guide rails, and a vertical limiting structure set at the top of the inner side of the storage compartment. Connecting shafts inserted into the inner side of the guide rails are fixedly connected to both sides of the positioning rods, and the connecting shafts are slidably connected to the guide rails.

[0012] The positioning rod first contacts the top of the electrode ear. As the support cover is pressed down, the connecting shaft slides from the bottom of the slide rail to the bend. Under the restriction of the vertical limiting structure, the positioning rod is guided to extend synchronously and the center positioning clamps the electrode post. The support cover continues to press down, and the connecting shaft slides to the top of the guide rail, guiding the positioning rod into the storage compartment and away from the welding area.

[0013] Furthermore, the vertical limiting structure includes a fixed rod fixedly connected to the top of the inner side of the storage compartment and a connecting rod slidably connected to the outside of the fixed rod. The top of the positioning rod is provided with a connecting groove, and the connecting groove is slidably connected to the connecting rod. A spring is provided between the connecting groove and the bottom end of the connecting rod.

[0014] Furthermore, the limiting assembly includes a connecting plate fixedly connected to the outer side of the top of the sleeve, a screw threadedly connected to the connecting plate, and a limiting plate slidably connected to the outer side of the sleeve, with the bottom end of the screw rotatably connected to the top end of the limiting plate.

[0015] Furthermore, an annular arc-shaped guide groove is provided on the outer side of the collar. The guide groove is connected to the slot. The depth of the guide groove is less than the depth of the slot. When the welded pipe is subjected to translational circumferential welding, the guide groove stabilizes the locking pin to prevent it from sliding and deviating.

[0016] Furthermore, the splash guard includes several splash guards fixedly installed at the bottom edge of the support plate and a connecting ring fixedly connected to the bottom of the splash guard.

[0017] Furthermore, the splash guards are made of transparent material, and each splash guard is assembled in a ring and can be replaced individually.

[0018] Furthermore, the connecting ring is rotatably connected to the top of the support cover, and the support plate and splash guard form a whole, which rotates independently of the collar and the support cover.

[0019] Furthermore, a groove is provided at the bottom of the support cover to increase the friction between the bottom of the support cover and the electrode ear.

[0020] Furthermore, the pressing assembly includes a pressing plate fixedly installed at the bottom center of the support plate via a connecting column, a second spring rod fixedly installed at the bottom of the pressing plate, a telescopic frame fixedly installed at the bottom of the second spring rod, and a ball bearing installed at the bottom of the telescopic frame.

[0021] Furthermore, a second ball bearing is installed at the bottom center of the lower pressure plate. The horizontal height of the second ball bearing is higher than the initial horizontal height of the first ball bearing. When the lower pressure plate moves down, the first ball bearing first contacts the top of the pole to be welded. The telescopic frame compression spring three retracts into the storage tube two. When the welding tube moves down to the welding point, the second ball bearing contacts the top of the pole to be welded. The first ball bearing and the second ball bearing press down simultaneously on the top of the pole to be welded.

[0022] The beneficial effects of this invention are as follows: 1. This invention is equipped with an automatically retractable positioning component. During the process of the welding pipe driving the clamp to press down on the electrode tab and electrode post, and the welding pipe continuously moving down to the welding height, the positioning rod is guided by the side "V"-shaped guide rail and driven by the downward pressure, actively extending out of the storage compartment, clamping and positioning the electrode post at the top of the electrode tab to the exact center of the top of the electrode tab, and then retracting back into the storage compartment, so that the positioning rod is away from the welding area. At the same time, this invention is equipped with a pressing component, which can stably press the center-positioned electrode post down on the electrode tab. With the rotating engagement collar, support plate, anti-splash component and support cover, it is easy for the welding pipe to perform a smooth translational circumferential welding of the electrode post, and simultaneously solves the problem of lack of center positioning when the electrode post is loaded and the problem of lack of stable clamping force between the electrode post and the electrode tab during welding.

[0023] (2) The present invention provides an adjustable limiting component at the connection between the clamp and the welded pipe. When the welded pipe drives the clamp to press down, the limiting component can limit the maximum distance that the welded pipe can slide down through the limiting plate, thereby completing the distance between the welding head of the welded pipe and the welding point of the electrode tab. Combined with the laser with the optically adjusted defocus amount, the electrode tabs and poles of different materials are welded, which reduces the frequent disassembly of the clamp and improves the adjustment efficiency.

[0024] (3) The splash guard of the present invention is assembled from multiple transparent splash guards and connecting rings. The welding condition between the tab and the pole can be observed more easily through the splash guard. The combined splash guards are easier to disassemble and replace when a single splash guard is damaged, thus improving maintenance efficiency. Attached Figure Description

[0025] Figure 1 This is a three-dimensional schematic diagram of a welding positioning fixture for lithium-ion battery tabs according to the present invention. Figure 1 .

[0026] Figure 2 This is a three-dimensional schematic diagram of a welding positioning fixture for lithium-ion battery tabs according to the present invention. Figure 2 .

[0027] Figure 3 This is a cross-sectional view of a welding positioning fixture for lithium-ion battery tabs according to the present invention. Figure 1 .

[0028] Figure 4 This is the present invention. Figure 3 A magnified view of region A in the middle.

[0029] Figure 5 This is the present invention. Figure 3 A magnified view of region B in the middle.

[0030] Figure 6 This is a cross-sectional view of a welding positioning fixture for lithium-ion battery tabs according to the present invention. Figure 2 .

[0031] Figure 7 This is the present invention. Figure 6 A magnified view of region C in the middle.

[0032] Figure 8 This is the present invention. Figure 6 A magnified view of region D in the middle.

[0033] Figure 9 This is a cross-sectional flowchart of the operation of the positioning component and the pressing component in this invention.

[0034] Figure 10 This is a schematic diagram of the working process of the present invention: translational circumferential welding of welded pipes.

[0035] Figure 11 This is a schematic diagram of the overall operation of a welding positioning fixture for lithium-ion battery tabs according to the present invention.

[0036] The diagram shows: 1. Welded pipe; 11. Tab; 12. Terminal post; 13. Square hard-shell battery; 2. Sleeve; 3. Collar; 4. Limiting assembly; 41. Connecting plate; 42. Screw; 43. Limiting plate; 5. Support plate; 6. Locking component; 61. Storage tube one; 62. Locking post; 63. Spring two; 64. Guide groove; 65. Slot; 7. Splash protector; 71. Splash protector plate; 72. Connecting ring; 8. Support cover; 81. Groove; 9. Positioning assembly; 91. Storage compartment; 92. Guide rail; 93. Positioning rod; 94. Connecting shaft; 95. Fixing rod; 96. Connecting rod; 97. Connecting groove; 98. Spring one; 10. Pressing assembly; 101. Pressing plate; 102. Storage tube two; 103. Telescopic frame; 104. Ball bearing one; 105. Ball bearing two; 106. Spring three. Detailed Implementation

[0037] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed to enable those skilled in the art to better understand and implement the subject matter described herein. Changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0038] See Figure 1 , Figure 3 , Figure 4 and Figure 11 This embodiment proposes a welding positioning fixture for lithium-ion battery tabs, comprising: a polygonal sleeve 2 fixedly installed on the outside of a welding tube 1; a collar 3 slidably connected to the outside of the sleeve 2; a limiting component 4 installed on the top of the sleeve 2; a support plate 5 rotatably connected to the outside of the collar 3; a locking component 6 installed on the top of the support plate 5; a splash guard 7 installed on the bottom of the support plate 5; a support cover 8 installed on the bottom of the splash guard 7; a positioning component 9 installed on the bottom of the support cover 8; and a pressing component 10 installed on the bottom of the support plate 5.

[0039] The common square hard-shell battery 13 has a tab 11 welded inside the mounting plate at the top, which needs to be positioned and welded to the terminal post 12 placed at the top of the tab 11.

[0040] The limiting component 4 includes a connecting plate 41 fixedly connected to the outer side of the top end of the sleeve 2, a screw 42 threadedly connected to the inner side of the connecting plate 41, and a limiting plate 43 slidably connected to the outer side of the sleeve 2. The bottom end of the screw 42 is rotatably connected to the top end of the limiting plate 43.

[0041] As one embodiment of the present invention, the material of the electrode tab 11 and electrode post 12 to be welded is adjusted according to the required defocusing amount. Then, the screw 42 with anti-slip block on the top is rotated. The screw 42 is threadedly connected to the connecting plate 41, causing the screw 42 to move up and down inside the connecting plate 41. Since the limiting plate 43 is slidably connected to the sleeve 2 and rotatably connected to the bottom end of the screw 42, the limiting plate 43 can slide up and down on the outside of the sleeve 2 under the drive of the screw 42, adjusting the initial distance between the limiting plate 43 and the collar 3.

[0042] When the welded pipe 1 is positioned and pressed down, the sleeve 2 slides down inside the collar 3, so that the limiting plate 43 contacts the collar 3. By adjusting the sliding distance of the sleeve 2, the downward movement distance of the welded pipe 1 and the welding distance between the welding torch tip tabs 11 are adjusted.

[0043] See Figure 1 , Figure 6 , Figure 7 and Figure 11 The positioning component 9 includes a storage compartment 91 at the bottom of the support cover 8, side "V"-shaped guide rails 92 fixedly connected to the inner walls of both sides of the storage compartment 91, an "L"-shaped positioning rod 93 slidably connected between the guide rails 92, and a vertical limiting structure set at the top of the inner side of the storage compartment 91. The positioning rod 93 is fixedly connected to two sides of a connecting shaft 94 inserted into the inner side of the guide rail 92, and the connecting shaft 94 is slidably connected to the guide rail 92.

[0044] The positioning rod 93 first contacts the top of the electrode ear. As the support cover 8 is pressed down, the connecting shaft 94 slides from the bottom of the slide rail to the bend. Under the restriction of the vertical limiting structure, the positioning rod 93 is guided to extend synchronously and centrally position and clamp the electrode column. The support cover 8 continues to press down, and the connecting shaft 94 slides to the top of the guide rail 92, guiding the positioning rod 93 into the storage compartment 91, away from the welding area.

[0045] The vertical limiting structure includes a fixed rod 95 fixedly connected to the top of the inner side of the storage compartment 91 and a connecting rod 96 slidably connected to the outside of the fixed rod 95. The top of the positioning rod 93 is provided with a connecting groove 97, and the connecting groove 97 is slidably connected to the connecting rod 96. A spring 98 is provided between the connecting groove 97 and the bottom end of the connecting rod 96.

[0046] As one embodiment of the present invention, when the limiting plate 43 contacts the collar 3 and continues to press down, the support cover 8 gradually approaches the electrode tab 11, the bottom end of the positioning rod 93 slides at the top of the electrode tab 11, and the connecting shafts 94 on both sides of the positioning rod 93 slide in the side "V" shaped guide rail 92. As the connecting shaft 94 slides to the middle bend of the side "V" shaped guide rail 92, the positioning rod 93 fits against the top of the electrode tab 11 and completes the extension of the storage compartment 91. Since several positioning rods 93 of equal length extend synchronously and abut against the offset electrode post 12, the electrode post 12 can slide to the top center of the electrode tab 11.

[0047] When the support cover 8 contacts the top of the electrode tab 11 and presses down firmly on the top of the electrode tab 11, the connecting shaft 94 of the positioning rod 93 slides to the top of the side "V"-shaped guide rail 92. Under the guidance, the positioning rod 93 retracts back into the storage compartment 91, away from the bottom of the electrode post 12 where welding is required, to prevent damage to the positioning rod 93 during the horizontal circumferential welding of the welding pipe 1.

[0048] As the positioning rod 93 moves, the distance between its top end and the inner top end of the storage compartment 91 gradually decreases, causing the connecting rod 96 to continuously compress the spring 98. When the welding is completed and the welding pipe 1 rises, the support cover 8 rises, at which point the compressed spring 98 can extend and reset, pushing the positioning rod 93 to move down in the shrink box. The connecting shaft 94 of the positioning rod 93 slides back to the bottom end in the side "V"-shaped guide rail 92, so that the positioning rod 93 is completely reset, which facilitates the center positioning of the pole post 12 during the next welding.

[0049] See Figure 7 , Figure 8 and Figure 11 The pressing assembly 10 includes a pressing plate 101 fixedly installed at the bottom center of the support plate 5 via a connecting column, a second spring rod fixedly installed at the bottom of the pressing plate 101, a telescopic frame 103 fixedly installed at the bottom of the second spring rod, and a first ball bearing 104 installed at the bottom of the telescopic frame 103. A second ball bearing 105 is installed at the bottom center of the pressing plate 101, and the horizontal height of the second ball bearing 105 is higher than the initial horizontal height of the first ball bearing 104.

[0050] The second spring rod includes a storage tube 102 fixedly connected to the bottom end of the lower pressure plate 101, a sliding rod slidably connected to the storage tube 102, and a third spring 106 fixedly connected between the storage tube 102 and the sliding rod. The bottom end of the sliding rod is fixedly connected to the top end of the telescopic frame 103.

[0051] In one embodiment of the present invention, when the positioning rod 93 centers on the pole post 12, that is, when the connecting shaft 94 slides to the middle bend of the side "V" shaped guide rail 92, the ball bearing 104 contacts the top of the pole post 12.

[0052] As the connecting shaft 94 slides to the top of the side "V"-shaped guide rail 92, several ball bearings 104 press down on the top of the pole post 12 to ensure even application of downward pressure and prevent the pole post 12 from tilting to the side. The ball bearings 104 also push the telescopic frame 103 to compress the spring 106, gradually retracting into the storage tube 102. When the connecting shaft 94 slides to the top of the side "V"-shaped guide rail 92, the ball bearing 105 at the center also presses down on the center of the top post of the pole post 12, completing the downward positioning of the pole post 12.

[0053] It should be noted that the tilt angle of the upper and lower sections of the guide rail 92 is designed so that the connecting shaft 94 will not jam when it moves up and down.

[0054] See Figure 1 , Figure 3 , Figure 5 and Figure 11 The locking component 6 is a spring rod 1 fixedly installed on the top of the support plate 5. The spring rod 1 includes a storage tube 1 61 fixedly installed on the top of the support plate 5, a locking pin 62 slidably connected to the inside of the storage tube 1 61, and a spring 2 63 fixedly connected between the storage tube 1 61 and the locking pin 62. One end of the spring rod 1 is hemispherical, that is, one end of the locking pin 62 is hemispherical. A hemispherical slot 65 is provided on one side of the collar 3. When the welding pipe 1 is performing translational circumferential welding, the edge of the slot 65 presses the locking pin 62 to automatically disengage from the slot 65. The slot 65 allows the locking pin 62 to be inserted after the welding pipe 1 has moved one revolution.

[0055] It should be noted that the elastic force of spring 63 is adaptively set by those skilled in the art based on multiple tests. When the welded pipe 1 moves and is positioned, spring 63 stably supports the locking pin 62 to insert into the slot 65.

[0056] An annular arc-shaped guide groove 64 is provided on the outer side of the collar 3. The guide groove 64 communicates with the slot 65. The depth of the guide groove 64 is less than the depth of the slot 65. When the welded pipe 1 is subjected to translational circumferential welding, the guide groove 64 stabilizes the locking pin 62 to prevent it from sliding or deviating. The anti-splash component 7 includes several anti-splash plates 71 fixedly installed at the bottom edge of the support plate 5 and a connecting ring 72 fixedly connected to the bottom end of the anti-splash plates 71. The anti-splash plates 71 are made of transparent material and are spliced ​​in a ring, allowing for individual replacement. The connecting ring 72 is rotatably connected to the top of the support cover 8. The bottom end of the support cover 8 has a groove 81, which increases the friction at the bottom end of the support cover 8 when the welded pipe 1 is subjected to translational circumferential welding.

[0057] As one embodiment of the present invention, when the welded pipe 1 slides down and pushes the collar 3 through the limiting plate 43, so that the support cover 8 is pressed down on the electrode tab 11, the center positioning and pressing positioning of the electrode post 12 have been completed simultaneously, and the distance between the welding head of the welded pipe 1 and the electrode tab 11 has reached the welding distance required for the corresponding decoking amount, and then welding can be carried out.

[0058] Laser welding is initiated to weld the bottom edge of the electrode post 12 to the electrode tab 11. At this time, the control system of the laser welding machine controls the welding tube 1 to perform translational circular welding around the electrode post 12. During welding, the initial direction of the welding tube 1 remains unchanged, and it welds around a circular trajectory centered on the electrode post 12.

[0059] The sleeve 2 drives the collar 3 around the center of the support plate 5, causing the splash guard 71 and the connecting ring 72 to rotate at the top of the support cover 8. At the same time, the collar 3 rotates inside the support plate 5. When the collar 3 rotates, it slides out the hemispherical locking pin 62 through the hemispherical slot 65, so that the locking pin 62 is inserted into the arc-shaped guide groove 64. After the welding pipe 1 completes one revolution of translational circular motion, the locking pin 62 is pushed down into the slot 65 of the collar 3 by the second spring 63, so that the support plate 5 and the collar 3 are locked together and return to the initial position. This prevents the support plate 5 and the collar 3 from moving and misaligning when the welding pipe 1 is moved and positioned, which would cause the fixture to be unable to position the pole post 12.

[0060] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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.

[0061] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0062] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0063] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A welding and positioning fixture for lithium-ion battery tabs, characterized in that, The utility model relates to a welding pipe automatic welding device, including: The polygonal sleeve is fixedly installed outside the welded pipe, the sleeve ring is slidably connected outside the sleeve, the limiting assembly is installed at the top end of the sleeve, the support plate is rotatably connected outside the sleeve ring, the plug-in lock is installed at the top end of the support plate, the splash-proof piece is installed at the bottom end of the support plate, the support cover is installed at the bottom end of the splash-proof piece, the positioning assembly is installed at the bottom of the support cover, and the pressing assembly is installed at the bottom end of the support plate; The plug-in lock is a spring rod one fixedly installed at the top end of the support plate, one end of the spring rod one protruding is hemispherical, and a hemispherical insertion slot is formed in one side of the sleeve ring; The positioning assembly includes a storage bin formed at the bottom of the support cover, a "V"-shaped guide rail fixedly connected to the inner walls on both sides of the storage bin, an "L"-shaped positioning rod slidably connected between the guide rails, and a vertical limiting structure arranged at the top end of the inner side of the storage bin, the positioning rod has a connecting shaft fixedly connected to the two sides of the positioning rod and slidably connected to the guide rail; The positioning rod first contacts the top end of the tab, and then the support cover is pressed down, the connecting shaft slides from the bottom end of the guide rail to the bending position, the positioning rod is guided to synchronously protrude and centrally clamp the pole under the limitation of the vertical limiting structure, the support cover continues to be pressed down, the connecting shaft slides to the top end of the guide rail, the positioning rod is guided to be retracted into the storage bin, and the support cover is away from the welding area.

2. The welding fixture for positioning the tab of a lithium battery cell according to claim 1, wherein: The vertical limiting structure includes a fixed rod fixedly connected to the top end of the inner side of the storage bin and a connecting rod slidably connected to the outer side of the fixed rod, a connecting groove is formed in the top end of the positioning rod, the connecting groove is slidably connected to the connecting rod, and a spring one is arranged between the connecting groove and the bottom end of the connecting rod.

3. The welding fixture for positioning the tab of a lithium battery cell of claim 1, wherein: The limiting assembly includes a connecting plate fixedly connected to the outer side of the top end of the sleeve, a screw rod threadedly connected to the connecting plate, and a limiting plate slidably connected to the outer side of the sleeve, the bottom end of the screw rod is rotatably connected to the top end of the limiting plate.

4. The welding fixture for positioning the tab of a lithium battery cell of claim 1, wherein: A ring-shaped arc-shaped guide groove is formed in the outer side of the sleeve ring, the guide groove is communicated with the insertion slot, the depth of the guide groove is smaller than the depth of the insertion slot, when the welded pipe is subjected to translational circumferential welding, the spring rod one includes a lock post, and the guide groove stably locks the lock post to prevent the lock post from sliding and deviating.

5. The welding fixture for positioning the tab of a lithium battery cell of claim 1, wherein: The splash-proof piece includes a plurality of splash-proof plates fixedly installed at the bottom end of the edges of the support plate and a connecting ring fixedly connected to the bottom end of the splash-proof plates.

6. The welding fixture for positioning the tab of a lithium battery cell of claim 5, wherein: The splash-proof plates are made of transparent material, each splash-proof plate is annularly spliced and separately replaced.

7. The welding fixture for positioning the tab of a lithium battery cell of claim 5, wherein: The connecting ring is rotatably connected to the top end of the support cover, the support plate and the splash-proof piece form an integral whole, and the integral whole is independently rotatable relative to the sleeve ring and the support cover.

8. The welding fixture for positioning the tab of a lithium battery cell of claim 1, wherein: A groove is formed in the bottom end of the support cover to increase the friction between the bottom end of the support cover and the tab.

9. The welding fixture for positioning the tab of a lithium battery cell of claim 1, wherein: The pressing assembly includes a pressing plate fixedly installed at the central bottom end of the support plate through a connecting column, a spring rod two fixedly installed at the bottom end of the pressing plate, an extension frame fixedly installed at the bottom end of the spring rod two, and a ball one installed at the bottom of the extension frame.

10. The welding fixture for positioning the tab of a lithium battery cell of claim 9, wherein: The central bottom end of the pressing plate is provided with a ball two, the horizontal height of the ball two is higher than the initial horizontal height of the ball one, the pressing plate is moved downward, the ball one first contacts the top end of the pole to be welded, the spring rod two includes a storage tube two, the extension frame is compressed into the storage tube two, when the welded pipe is moved downward to the welding position, the ball two contacts the top end of the pole to be welded, and the ball one is synchronously pressed on the top end of the pole to be welded with the ball two.

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