Welding fixture for battery cells and method of using same

Abstract

The application relates to a welding tool for an electric core and a use method thereof, and the welding tool comprises a linear guide rail, a winding positioning carrier, an electrode connecting sheet carrier and a cover plate positioning carrier; the linear guide rail is provided with a first welding station and a second welding station along the length direction of the linear guide rail; the winding positioning carrier is slidably connected to the linear guide rail and is used for positioning and mounting winding; the winding positioning carrier can be moved from the first welding station to the second welding station; when the winding positioning carrier is located at the first welding station, the electrode connecting sheet carrier can be matched with the winding positioning carrier to realize the positioning and mounting of the winding tab and the electrode connecting sheet, so that the two are welded to form an electric core assembly; when the winding positioning carrier is located at the second welding station, the cover plate positioning carrier can be matched with the winding positioning carrier to realize the positioning and mounting of the electric core assembly and the cover plate. In the application, the electric core component and the positioning tool are not separated, the secondary positioning is avoided, and the problems caused by the positional deviation due to the positional deviation of the positioning are solved.

Description

Technical Field

[0001] This invention relates to the field of battery cell processing technology, and in particular to a welding fixture for battery cells and its method of use. Background Technology

[0002] Currently, battery cell factories typically use ultrasonic welding to weld the battery cell's winding tabs and electrode connecting pieces. Then, the product is picked up and placed in a laser welding station, where laser welding is used to weld the electrode connecting pieces to the electrode posts on the cover plate. Because secondary positioning is required during the transfer process, it is very easy for the electrode connecting pieces and the cover plate to become misaligned during welding. If misalignment occurs, the cover plate can be easily pierced by the laser when welding to the aluminum shell, causing a short circuit in the battery. Alternatively, it can lead to difficulties in subsequent processes such as inserting the battery cell into the shell or deformation of the shell after insertion. If the shell is deformed, air bubbles are likely to be generated during the subsequent blue film coating process, directly affecting the quality of the finished battery cell. Summary of the Invention

[0003] Therefore, it is necessary to address the technical problem that secondary positioning is required during the cell welding process, which can easily cause welding misalignment between the electrode connecting piece and the cover plate. Firstly, this invention provides a welding fixture for battery cells, including a linear guide rail, a winding positioning carrier, an electrode connecting piece carrier, and a cover plate positioning carrier. The linear guide rail has a first welding station and a second welding station along its length. The winding positioning carrier is slidably connected to the linear guide rail for positioning and installing the winding. The electrode connecting piece carrier is located at the first welding station for positioning and installing the electrode connecting piece. The cover plate positioning carrier is located at the second welding station. At the second welding station, a cover plate is positioned and installed. The winding positioning carrier can move from the first welding station to the second welding station. When the winding positioning carrier is at the first welding station, the electrode connecting piece carrier can cooperate with the winding positioning carrier to position and install the wound electrode tab and the electrode connecting piece, so that they are welded together to form a battery cell assembly. When the winding positioning carrier is at the second welding station, the cover plate positioning carrier can cooperate with the winding positioning carrier to position and install the battery cell assembly and the cover plate.

[0004] By adopting the above technical solution, electrode connecting pieces are positioned and installed on the electrode connecting piece carrier, a cover plate is positioned and installed on the cover plate positioning carrier, and a winding is positioned and installed on the winding positioning carrier. When the winding positioning carrier is at the first welding station, the electrode connecting piece carrier can cooperate with the winding positioning carrier to achieve the positioning and installation of the winding electrode tab and the electrode connecting piece. The welding equipment welds the electrode tab and the electrode connecting piece to form a battery cell assembly. When the winding positioning carrier moves from the first welding station to the second welding station, the cover plate positioning carrier can cooperate with the winding positioning carrier to achieve the positioning and installation of the battery cell assembly and the cover plate. The welding equipment welds the cover plate and the battery cell assembly to form a battery cell. The switching of the winding positioning carrier from the first welding station to the second welding station is achieved by using a linear guide rail. During the process, the battery cell component and the positioning fixture are not separated, avoiding the need for secondary positioning, thereby solving the problem of welding misalignment caused by positioning offset.

[0005] Furthermore, the winding positioning carrier includes a base and a positioning clamp; the base is provided with a limiting groove for mounting the winding, the positioning clamp is disposed on the base, and the positioning clamp can rotate from a first station to a second station. When the positioning clamp is in the first station, the positioning clamp positions and clamps the tab and the electrode connecting piece. When the positioning clamp is in the second station, the positioning clamp releases the positioning clamp on the tab and the electrode connecting piece.

[0006] By adopting the above technical solution, the limiting groove can limit and fix the winding to achieve the positioning and installation of the winding, and the positioning clamp can clamp and fix the electrode tab and the electrode connecting piece to fix the position between the two and prevent them from being misaligned during the welding process.

[0007] Furthermore, the positioning clamping component includes a rotary pressing cylinder, a connecting rod, a positioning block, and a first positioning pin; the rotary pressing cylinder is connected to the base, one end of the connecting rod is connected to the output shaft of the rotary pressing cylinder, the other end of the connecting rod is connected to the positioning block, and the first positioning pin is connected to the positioning block, the first positioning pin being used to engage with the positioning hole on the electrode connecting piece.

[0008] By adopting the above technical solution, the rotary pressing cylinder drives the positioning block to rotate through the connecting rod, so as to realize the change of the position of the positioning block. The positioning block can press against the electrode connecting piece to realize the clamping of the electrode connecting piece and the electrode tab. At the same time, it can also limit the stress deformation generated by the motor connecting piece during welding. The first positioning pin can be inserted into the positioning hole on the electrode connecting piece to realize the positioning and fixing of the electrode connecting piece.

[0009] Furthermore, the positioning block is provided with a window for welding.

[0010] By adopting the above technical solution, the welding equipment can weld the battery cell components through this window.

[0011] Furthermore, the electrode connecting piece carrier includes a first carrier platform, a positioning component, and a first lifting cylinder. The first carrier platform is connected to the positioning component, which is used to engage with the positioning hole on the electrode connecting piece to position and install the electrode connecting piece. The first lifting cylinder is connected to the first carrier platform and is used to drive the first carrier platform away from or closer to the winding positioning carrier.

[0012] By adopting the above technical solution, the first lifting cylinder can drive the first carrier platform away from or close to the winding positioning carrier, so as to realize the connection or separation between the electrode connecting piece carrier and the winding positioning carrier. The positioning component is connected with the positioning hole on the electrode connecting piece to realize the positioning and installation of the electrode connecting piece.

[0013] Furthermore, the positioning component includes a base plate, a spring, and a second positioning pin. One end of the spring is connected to the base plate, and the other end of the spring is connected to the second positioning pin. The base plate is fixedly connected to the first carrier platform, and the second positioning pin is used to engage with the positioning hole on the electrode connecting piece.

[0014] By adopting the above technical solution, the second positioning pin is placed through a spring connection and can extend and retract along the length of the spring so that it can cooperate with other positioning components to achieve positioning and fixing of the electrode connecting piece.

[0015] Furthermore, the cover plate positioning carrier includes a second carrier platform and a second lifting cylinder. The second lifting cylinder is connected to the second carrier platform and is used to drive the second carrier platform away from or closer to the winding positioning carrier.

[0016] By adopting the above technical solution, the second lifting cylinder can drive the second carrier platform away from or close to the winding positioning carrier, so as to realize the connection or separation between the cover plate positioning carrier and the winding positioning carrier.

[0017] Furthermore, the second vehicle platform is provided with a positioning groove, which is used to cooperate with the pole on the cover plate to achieve positioning.

[0018] By adopting the above technical solution, the positioning groove and the pole on the cover plate are connected to achieve the positioning connection of the cover plate.

[0019] Furthermore, the linear guide rail includes a base, a slide rail, a slider, and a drive assembly; the base is provided with the slide rail, the slider is slidably connected to the slide rail, the winding positioning carrier is fixedly connected to the slider, the drive assembly is connected to the slider, and the drive assembly can drive the winding positioning carrier to reciprocate between the first welding station and the second welding station.

[0020] By adopting the above technical solution, the cooperation between the slide rail and the slider can guide the movement of the winding positioning carrier, and the drive component can drive the winding positioning carrier to move back and forth between the first welding station and the second welding station to realize the cyclic operation of the process.

[0021] Secondly, the present invention also provides a method for using the welding fixture for battery cells described in any of the above technical solutions, comprising the following steps:

[0022] The winding positioning device is installed in the winding positioning carrier, the electrode connecting piece is positioned in the electrode connecting piece carrier, and the cover plate is positioned in the cover plate positioning carrier.

[0023] The winding positioning carrier moves to the first welding station, and the electrode connecting piece carrier cooperates with the winding positioning carrier to position and install the electrode connecting piece on the wound electrode tab;

[0024] The first welding equipment welds the electrode connecting piece to the electrode tab to form a battery cell assembly;

[0025] The winding positioning carrier moves to the second welding station, and the cover plate positioning carrier cooperates with the winding positioning carrier to position and install the cover plate onto the battery cell assembly.

[0026] The second welding equipment welds the cover plate and the cell assembly together to form a cell. Attached Figure Description

[0027] Figure 1 An exploded view of the structure of the welding fixture for battery cells provided in an embodiment of the present invention;

[0028] Figure 2 This is one of the usage state diagrams of the welding fixture for battery cells provided in an embodiment of the present invention;

[0029] Figure 3 This is the second diagram showing the usage state of the welding fixture for battery cells provided in an embodiment of the present invention.

[0030] In the diagram, 100 is the battery cell assembly; 101 is the first winding; 102 is the second winding; 103 is the negative electrode connector; 104 is the positive electrode connector; 105 is the cover plate; 106 is the negative electrode terminal connector; 107 is the positive electrode terminal connector; 1011 is the positive electrode tab; 1012 is the negative electrode tab; and 500 is the battery cell.

[0031] 1. Linear guide rail; 2. Winding positioning carrier; 3. Electrode connecting piece carrier; 4. Cover plate positioning carrier; 11. Base; 12. Slide rail; 13. Slider; 21. Base; 22. Positioning clamp; 211. Limiting groove; 221. Rotary pressing cylinder; 222. Connecting rod; 223. Positioning block; 224. First positioning pin; 2231. Window; 31. First carrier platform; 32. Positioning assembly; 33. First lifting cylinder; 321. Base plate; 322. Spring; 323. Second positioning pin; 41. Second carrier platform; 42. Second lifting cylinder; 411. Positioning groove; Y1. First welding station; Y2. Second welding station; A. First station; B. Second station. Detailed Implementation

[0032] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0034] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0035] Furthermore, the terms "first" and "second" 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" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" or "several" means two or more, unless otherwise explicitly specified.

[0036] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the content disclosed herein. They are not intended to limit the implementation conditions of this application and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effectiveness and purpose of this application, should still fall within the scope of the technical content disclosed herein. Furthermore, the term "and / or" as used in this specification includes any and all combinations of the related listed items.

[0037] like Figure 1 , Figure 2 as well as Figure 3 As shown, this embodiment of the invention provides a welding fixture for battery cells, including a linear guide rail 1, a winding positioning carrier 2, an electrode connecting piece carrier 3, and a cover plate positioning carrier 4; the linear guide rail 1 has a first welding station Y1 and a second welding station Y2 along its length; the winding positioning carrier 2 is slidably connected to the linear guide rail 1 and is used for positioning and installing the winding (… Figure 1 The winding shown includes a first winding 101 and a second winding 102; the electrode connecting piece carrier 3 is located at the first welding station Y1 and is used to position and install the electrode connecting piece. Figure 1 The electrode connecting pieces shown include a positive electrode connecting piece 104 and a negative electrode connecting piece 103; the cover plate positioning carrier 4 is located at the second welding station Y1 and is used to position and install the cover plate 105 (the cover plate 105 is provided with a negative electrode post connecting piece 106 and a positive electrode post connecting piece 107, the negative electrode post connecting piece 106 is connected to the negative electrode post, and the positive electrode post connecting piece 107 is connected to the positive electrode post); wherein, the winding positioning carrier 2 can move from the first welding station Y1 to the second welding station Y2, and when the winding positioning carrier 2 is located at the first welding station Y1, the electrode connecting piece carrier 3 can cooperate with the winding positioning carrier 2 to realize the winding of the electrode tab of 10 ( Figure 1 The electrode tabs shown include a positive electrode tab 1011 and a negative electrode tab 1012, and the electrode connecting piece are positioned and installed so that they are welded together to form a battery cell assembly 100. When the winding positioning carrier 2 is located at the second welding station Y2, the cover plate positioning carrier 4 can cooperate with the winding positioning carrier 2 to realize the positioning and installation of the battery cell assembly 100 and the cover plate 105. Specifically, the linear guide rail 1 can be a programmable automated device. By setting the specific coordinate points of the first welding station Y1 and the second welding station Y2, the precise positioning of the first welding station Y1 and the second welding station Y2 can be achieved. Alternatively, a retractable limiting block can be set at the end of the first welding station Y1 and the second welding station Y2, and the precise positioning of the winding positioning carrier 2 can be achieved by the limiting block intercepting the winding positioning carrier 2.

[0038] By adopting the above technical solution, electrode connecting pieces are positioned and installed on electrode connecting piece carrier 3, cover plate 105 is positioned and installed on cover plate positioning carrier 4, and winding is positioned and installed on winding positioning carrier. When the winding positioning carrier is at the first welding station Y1, electrode connecting piece carrier 3 can cooperate with winding positioning carrier 2 to realize the positioning and installation of winding electrode tabs and electrode connecting pieces. The welding equipment welds electrode tabs and electrode connecting pieces to form a battery cell assembly. When winding positioning carrier 2 moves from the first welding station Y1 to the second welding station Y2, cover plate positioning carrier 4 can cooperate with winding positioning carrier 2 to realize the positioning and installation of battery cell assembly 100 and cover plate 105. The welding equipment welds cover plate 105 and battery cell assembly 100 to form battery cell 500. The switching of winding positioning carrier 2 from the first welding station Y1 to the second welding station Y2 is realized by linear guide rail 1. During the process, the battery cell component and positioning fixture are not separated, avoiding the need for secondary positioning, thereby solving the problem of welding misalignment caused by positioning offset.

[0039] Furthermore, the winding positioning carrier 2 includes a base 21 and a positioning clamp 22; the base 21 is provided with a limiting groove 211 for mounting the winding, and the positioning clamp 22 is disposed on the base 21. The positioning clamp 22 can rotate from the first station A to the second station B. When the positioning clamp 22 is located at the first station A, the positioning clamp 22 positions and clamps the tab and the electrode connecting piece. When the positioning clamp 22 is located at the second station B, the positioning clamp 22 releases the positioning clamp on the tab and the electrode connecting piece.

[0040] By adopting the above technical solution, the limiting groove 211 can limit and fix the winding to achieve the positioning and installation of the winding, and the positioning clamp 22 can clamp and fix the electrode tab and the electrode connecting piece to fix the position between the two and prevent them from being misaligned during the welding process.

[0041] Furthermore, the positioning clamping component 22 includes a rotary pressing cylinder 221, a connecting rod 222, a positioning block 223, and a first positioning pin 224; the rotary pressing cylinder 221 is connected to the base 21, one end of the connecting rod 222 is connected to the output shaft of the rotary pressing cylinder 221, and the other end of the connecting rod 222 is connected to the positioning block 223. The positioning block 223 is connected to the first positioning pin 224, which is used to engage with the positioning hole on the electrode connecting piece.

[0042] By adopting the above technical solution, the rotary pressing cylinder 221 drives the positioning block 223 to rotate through the connecting rod 222, so as to realize the change of the position of the positioning block 223. The positioning block 223 can press against the electrode connecting piece to realize the clamping of the electrode connecting piece and the electrode tab. At the same time, it can also limit the stress deformation generated by the motor connecting piece during welding. The first positioning pin 224 can be inserted into the positioning hole on the electrode connecting piece to realize the positioning and fixing of the electrode connecting piece.

[0043] Furthermore, the positioning block 223 is provided with a window 2231 for welding.

[0044] By adopting the above technical solution, the welding equipment can weld the battery cell components through this window.

[0045] Furthermore, the electrode connector carrier 3 includes a first carrier platform 31, a positioning component 32, and a first lifting cylinder 33. The first carrier platform 31 is connected to the positioning component 32, which is used to engage with the positioning holes on the electrode connector to position and install the electrode connector. The first lifting cylinder 33 is connected to the first carrier platform 31 and is used to drive the first carrier platform 31 away from or towards the winding positioning carrier 2. Specifically, the first carrier platform 31 can move along the Z1 and Z2 directions shown in the figure.

[0046] By adopting the above technical solution, the first lifting cylinder 33 can drive the first carrier platform 31 away from or close to the winding positioning carrier 2, so as to realize the connection or separation between the electrode connecting piece carrier and the winding positioning carrier 2. The positioning component 32 is connected with the positioning hole on the electrode connecting piece to realize the positioning and installation of the electrode connecting piece.

[0047] Furthermore, the positioning component 32 includes a base plate 321, a spring 322, and a second positioning pin 323. One end of the spring 322 is connected to the base plate 321, and the other end of the spring 322 is connected to the second positioning pin 323. The base plate 321 is fixedly connected to the first carrier platform 31, and the second positioning pin 323 is used to engage with the positioning hole on the electrode connecting piece. The cover plate positioning carrier can cooperate with the winding positioning carrier 2. By rotating the pressing cylinder 221, the first positioning pin 224 is driven to insert into the positioning hole of the electrode connecting piece. The lower spring 322 of the second positioning pin 323 is compressed, and the upper first positioning pin 224 is inserted, performing a positioning up-down conversion, so that the lower installation positioning achieved by the second positioning pin 323 is converted into the upper installation positioning achieved by the first positioning pin 224.

[0048] By adopting the above technical solution, the second positioning pin 323 is connected and placed through the spring 322, and can extend and retract along the length direction of the spring 322 so that it can cooperate with other positioning components to achieve positioning and fixing of the electrode connecting piece.

[0049] Furthermore, the cover plate positioning carrier 4 includes a second carrier platform 41 and a second lifting cylinder 42. The second lifting cylinder 42 is connected to the second carrier platform 41 and is used to drive the second carrier platform 41 away from or towards the winding positioning carrier 2. Specifically, the second carrier platform 41 can move along the Z1 and Z2 directions shown in the figure.

[0050] By adopting the above technical solution, the second lifting cylinder 42 can drive the second carrier platform 41 away from or close to the winding positioning carrier 2, so as to realize the cooperation connection or separation between the cover plate positioning carrier 4 and the winding positioning carrier 2.

[0051] Furthermore, the second vehicle platform 41 is provided with a positioning groove 411, which is used to cooperate with the pole on the cover plate 105 to achieve positioning.

[0052] By adopting the above technical solution, the positioning groove 411 is connected with the pole on the cover plate to achieve the positioning connection of the cover plate 105.

[0053] Furthermore, the linear guide 1 includes a base 11, a slide rail 12, a slider 13, and a drive assembly (not shown); the base 11 is provided with a slide rail 12, a slider 13 is slidably connected to the slide rail 12, a winding positioning carrier 2 is fixedly connected to the slider 13, and the drive assembly is connected to the slider 13. The drive assembly can drive the winding positioning carrier 2 to reciprocate between the first welding station Y1 and the second welding station Y2.

[0054] By adopting the above technical solution, the cooperation between the slide rail 12 and the slider 13 can guide the movement of the winding positioning carrier 2. The drive component can drive the winding positioning carrier 2 to move back and forth between the first welding station Y1 and the second welding station Y2 to realize the cyclic operation of the process.

[0055] This invention also provides a method for using the welding fixture for battery cells according to any of the above technical solutions, comprising the following steps:

[0056] The winding positioning device is installed on the winding positioning carrier 2, the electrode connecting piece is positioned on the electrode connecting piece carrier, and the cover plate 105 is positioned on the cover plate positioning carrier 4.

[0057] The winding positioning carrier moves to the first welding station Y1, and the electrode connecting piece carrier 3 cooperates with the winding positioning carrier 2 to position and install the electrode connecting piece on the wound electrode tab.

[0058] The first welding equipment welds the electrode connecting piece and the electrode tab to form the battery cell assembly 100;

[0059] The winding positioning carrier moves to the second welding station Y2, and the cover plate positioning carrier 4 cooperates with the winding positioning carrier 2 to position and install the cover plate 105 on the cell assembly.

[0060] The second welding equipment welds the connecting cover plate 105 and the cell assembly 100 to form the cell 500.

[0061] The method of using the welding fixture for battery cells provided in this embodiment includes the beneficial effects of any of the above embodiments, and this application will not repeat them here.

[0062] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A welding fixture for battery cells, characterized in that, include: A linear guide rail has a first welding station and a second welding station along its length. A winding positioning carrier is slidably connected to the linear guide rail for positioning and installing the winding. An electrode connector carrier is provided at the first welding station for positioning and installing electrode connectors; A cover plate positioning carrier is located at the second welding station and is used to position and install the cover plate; The winding positioning carrier can move from the first welding station to the second welding station. When the winding positioning carrier is at the first welding station, the electrode connecting piece carrier can cooperate with the winding positioning carrier to position and install the wound electrode tab and the electrode connecting piece, so that the two are welded to form a battery cell assembly. When the winding positioning carrier is at the second welding station, the cover plate positioning carrier can cooperate with the winding positioning carrier to position and install the battery cell assembly and the cover plate. The positioning carrier includes a base and a positioning clamping member. The base has a limiting groove for mounting the winding mechanism. The positioning clamping member is disposed on the base and can rotate from a first position to a second position. When the positioning clamping member is in the first position, it positions and clamps the electrode tab and the electrode connecting piece. When the positioning clamping member is in the second position, it releases the positioning clamp on the electrode tab and the electrode connecting piece. The positioning clamping member includes a rotating pressing cylinder, a connecting rod, a positioning block, and... The first positioning pin; the rotary pressing cylinder is connected to the base, one end of the connecting rod is connected to the output shaft of the rotary pressing cylinder, and the other end of the connecting rod is connected to the positioning block. The positioning block is connected to the first positioning pin, which is used to engage with the positioning hole on the electrode connecting piece; the positioning block is provided with a window for welding; the electrode connecting piece carrier includes a first carrier platform, a positioning component, and a first lifting cylinder. The first carrier platform is connected to the positioning component, which is used to engage with the positioning hole on the electrode connecting piece to position and install the electrode connecting piece. The first lifting cylinder is connected to the first carrier platform and is used to drive the first carrier platform away from or closer to the winding positioning carrier; the positioning component includes a base plate, a spring, and a second positioning pin. One end of the spring is connected to the base plate, and the other end of the spring is connected to the second positioning pin. The base plate is fixedly connected to the first carrier platform, and the second positioning pin is used to engage with the positioning hole on the electrode connecting piece. The cover plate positioning carrier includes a second carrier platform and a second lifting cylinder. The second lifting cylinder is connected to the second carrier platform and is used to drive the second carrier platform away from or closer to the winding positioning carrier. The second carrier platform is provided with a positioning groove, which is used to cooperate with the pole on the cover plate to achieve positioning.

2. The welding fixture for battery cells according to claim 1, characterized in that, The linear guide rail includes a base, a slide rail, a slider, and a drive assembly; the base is provided with the slide rail, the slider is slidably connected to the slide rail, the winding positioning carrier is fixedly connected to the slider, the drive assembly is connected to the slider, and the drive assembly can drive the winding positioning carrier to reciprocate between the first welding station and the second welding station.

3. A method of using the welding fixture for battery cells as described in claim 1 or 2, characterized in that, Includes the following steps: The winding positioning device is installed in the winding positioning carrier, the electrode connecting piece is positioned in the electrode connecting piece carrier, and the cover plate is positioned in the cover plate positioning carrier. The winding positioning carrier moves to the first welding station, and the electrode connecting piece carrier cooperates with the winding positioning carrier to position and install the electrode connecting piece on the wound electrode tab; The first welding equipment welds the electrode connecting piece to the electrode tab to form a battery cell assembly; The winding positioning carrier moves to the second welding station, and the cover plate positioning carrier cooperates with the winding positioning carrier to position and install the cover plate onto the battery cell assembly. The second welding equipment welds the cover plate and the cell assembly together to form a cell.

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