A cylindrical battery welding apparatus

Abstract

This invention provides a cylindrical battery welding device for welding a current collector plate onto a battery cell. The current collector plate has a cover plate connected to it, and the battery cell is cylindrical. The cylindrical battery welding device includes: a battery cell fixture for connecting the battery cell, with a positioning line on the fixture, the central axis of the battery cell held by the fixture coinciding with the positioning line; a current collector plate fixture, including a negative pressure adsorption device and a positioning post, the negative pressure adsorption device adsorbing the current collector plate, the central axis of the positioning post coinciding with the positioning line, and a positioning hole on the current collector plate matching the positioning post, the positioning post passing through the positioning hole; and a first driving member for driving the battery cell fixture to translate, so that the battery cell moves away from or closer to the current collector plate. This invention can solve the positioning problem during the welding of the battery cell and the current collector plate.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing technology, and in particular to a cylindrical battery welding device. Background Technology

[0002] In existing production technologies, the manufacturing process of lithium-ion batteries requires welding current collectors onto the battery cells. To improve automation, automated welding equipment is typically used. When welding the current collectors onto the cells, the cells and current collectors need to be positioned, specifically aligning the end face of the cylindrical cell with the disc-shaped current collector. Therefore, a device is needed to position the cells and current collectors during the welding process. Summary of the Invention

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a cylindrical battery welding device that can solve the positioning problem during the welding of battery cells and current collectors.

[0004] According to an embodiment of the present invention, a cylindrical battery welding apparatus is characterized in that it is used to weld a current collector onto a battery cell. The cylindrical battery welding apparatus includes: a battery cell fixture for connecting the battery cell, the battery cell fixture having a positioning straight line provided thereon, wherein when the battery cell is connected to the battery cell fixture, the central axis of the battery cell coincides with the positioning straight line; a current collector fixture including a positioning post, the central axis of the positioning post coinciding with the positioning straight line, the current collector having a positioning hole matching the positioning post, the positioning post being able to pass through the positioning hole; and a first driving member for driving the battery cell fixture to translate along the central axis of the positioning post to change the distance between the battery cell fixture and the current collector fixture.

[0005] The cylindrical battery welding apparatus according to an embodiment of the present invention has at least the following beneficial effects: the apparatus positions the battery cell using a cell fixture, thereby constraining the position of the battery cell so that the central axis of the battery cell coincides with the positioning line; the apparatus positions the current collector plate using a current collector plate fixture, thereby constraining the position of the current collector plate. Since the central axis of the positioning post passing through the current collector plate coincides with the positioning line, the current collector plate and the battery cell are aligned. While maintaining the alignment of the battery cell and the current collector plate, the first driving member can drive the cell fixture and the current collector plate fixture to move closer to each other, so that the battery cell and the current collector plate can be welded together subsequently.

[0006] According to some embodiments of the present invention, the battery cell fixture includes: clamping plates, at least two of which are provided, the plurality of clamping plates being arranged around the positioning line and spaced apart; a second driving member, the second driving member being connected to the clamping plates, the second driving member being capable of driving the plurality of clamping plates to retract towards each other, the second driving member also being capable of driving the plurality of clamping plates to open towards each other, and the first driving member being used to drive the second driving member to translate along the central axis of the positioning post.

[0007] According to some embodiments of the present invention, the cylindrical battery welding equipment further includes a placement platform, the top of which is provided with a placement surface for placing the battery cell, and the battery cell fixture for clamping the battery cell on the placement platform.

[0008] According to some embodiments of the present invention, the battery cell fixture has an open state and a closed state. The battery cell fixture includes: at least two lower clamping plates, the side surface of the lower clamping plates facing the positioning line being a clamping surface; at least one upper clamping plate, the upper clamping plate and the lower clamping plate being arranged around the positioning line, the upper clamping plate being located above the placement surface; and a second driving member, the lower clamping plate and the upper clamping plate being connected to the second driving member, the second driving member being used to drive the lower clamping plate and the upper clamping plate to move, so that the battery cell fixture switches between an open state and a closed state. When the battery cell fixture is in the open state, the lower clamping plates are respectively located on both sides of the placement surface, and at least a portion of the clamping surface is located below the placement surface. When the battery cell fixture is in the closed state, the bottom end of the clamping surface is located above the placement surface, and the upper clamping plate and the lower clamping plate together clamp the battery cell.

[0009] According to some embodiments of the present invention, the placement surface is a concave arc surface.

[0010] According to some embodiments of the present invention, the length of the upper clamping plate is less than the length of the lower clamping plate.

[0011] According to some embodiments of the present invention, the manifold fixture further includes an adsorption surface, the adsorption surface having a plurality of adsorption holes, the positioning post being connected to the adsorption surface and protruding relative to the adsorption surface, and the adsorption holes being disposed on the periphery of the positioning post.

[0012] According to some embodiments of the present invention, a cover plate is connected to the collector plate, and the collector plate fixture further includes a limiting block and a third driving member connected to each other. The third driving member is used to drive the limiting block to move so that the limiting block clamps the cover plate.

[0013] According to some embodiments of the present invention, the cylindrical battery welding equipment includes a positioning pin and a positioning hole that can be inserted into each other. One of the positioning pin and the positioning hole is disposed on the cell fixture, and the other is disposed on the current collector fixture. The central axis of the positioning hole coincides with the central axis of the positioning pin, and the central axis of the positioning pin is parallel to the positioning line.

[0014] According to some embodiments of the present invention, the positioning post includes an adjustment portion disposed at one end of the positioning post near the battery cell fixture, and the cross-sectional area of ​​the adjustment portion gradually decreases along the direction from the current collector fixture to the battery cell fixture.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0017] Figure 1 This is a schematic diagram of the cylindrical battery welding equipment of the present invention;

[0018] Figure 2 This is a side view of the cylindrical battery welding equipment of the present invention;

[0019] Figure 3 for Figure 2 A magnified view of area A in the middle;

[0020] Figure 4 This is a schematic diagram of the structure of the collector plate and cover plate of the present invention;

[0021] Figure 5 This is a schematic diagram of the battery cell structure of the present invention;

[0022] Figure 6 This is a schematic diagram of the structure of the battery cell of the present invention disposed inside the housing.

[0023] Figure label:

[0024] 1. Battery cell fixture; 11. Second drive unit; 12. Clamping plate; 121. Upper clamping plate; 122. Lower clamping plate; 13. Base; 14. Positioning pin; 15. Positioning line; 2. Collector plate fixture; 21. Adsorption device; 22. Positioning post; 23. Limiting block; 24. Third drive unit; 25. Adjustment part; 26. Pin hole; 3. First drive unit; 4. Placement platform; 5. Slide rail; 6. Battery cell; 61. Through hole; 7. Collector plate; 71. Positioning hole; 8. Housing; 9. Cover plate. Detailed Implementation

[0025] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0026] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0027] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0028] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0029] An embodiment of the cylindrical battery welding apparatus of the present invention is used to weld current collectors onto battery cells, as described below. Figure 4 , Figure 5 and Figure 6 The current collector 7 is connected to a cover plate 9, but the cover plate 9 may or may not be installed. The battery cell 6 is cylindrical. During the battery manufacturing process, the current collector 7 needs to be welded to the battery cell 6. Before welding the current collector 7 to the battery cell 6, a cover plate 9 is installed on the current collector 7. After the current collector 7 is welded to the battery cell 6, the cover plate 9 is bent to cover the battery cell 6. When the current collector is welded to the battery cell 6, the battery cell 6 can be a bare battery cell 6, that is, the battery cell 6 does not have a casing 8. Alternatively, a casing 8 can be installed on the battery cell 6 before the current collector 7 is welded to the battery cell 6.

[0030] Reference Figure 1 and Figure 2The cylindrical battery welding equipment includes: a cell fixture 1, which is used to clamp a cell 6. The cell fixture 1 has a positioning line 15, and the central axis of the cell 6 clamped by the cell fixture 1 coincides with the positioning line 15. The cell 6 is cylindrical, and a current collector 7 is welded to one end of the cylindrical cell 6. The cell fixture 1 clamps the cell 6, holding its curved sides and positioning the end face where the current collector is welded. Specifically, the cell fixture 1 positions the cell 6 using three clamping surfaces. The positioning line 15 is equidistant from the three clamping surfaces, ensuring that the central axis of the cylindrical cell 6 coincides with the positioning line 15. This is how the cell 6 is positioned. The positioning line 15 is a hypothetical line. When the cell fixture 1 clamps different cells 6, the central axis of all cells 6 is in the same position relative to the cell fixture 1. The position of this central axis is the positioning line 15.

[0031] For example, a battery cell fixture includes an upper clamping plate and two lower clamping plates. These three clamping plates are used to clamp the battery cell together. The upper clamping plate and the two lower clamping plates together enclose a cylindrical space for accommodating the battery cell. The central axis of this cylindrical space is the positioning line. The positioning line also satisfies the following condition: the distance between the upper clamping plate and the positioning line is the same as the distance between the lower clamping plates and the positioning line.

[0032] The cylindrical battery welding equipment also includes a current collector fixture 2. The current collector fixture 2 includes a negative pressure adsorption device 21 and a positioning post 22. The negative pressure adsorption device 21 is used to adsorb the current collector 7. The central axis of the positioning post 22 coincides with the positioning line 15. The current collector 7 has a positioning hole 71 that matches the positioning post 22, through which the positioning post 22 passes. Specifically, the positioning post 22 is cylindrical, and its central axis coincides with the positioning line 15. Therefore, when the positioning post 22 passes through the positioning hole 71 and engages with the current collector 7, the center point of the current collector 7 is on the positioning line 15, allowing the end faces of the current collector 7 and the battery cell 6 to be correspondingly positioned. Furthermore, a chamfer or rounded corner is provided at the end of the positioning post 22 near the battery cell 6, making it easier and faster for the positioning post 22 to pass through the positioning hole 71 when the current collector 7 is placed into it for positioning. Furthermore, air holes can be opened inside the positioning post 22. When welding the battery cell 6 and the current collector 7, protective gas can be blown into the welding area through the air holes, thereby improving the welding effect.

[0033] The cylindrical battery welding equipment also includes a first driving component 3. The first driving component 3 drives the cell fixture 1 to translate, causing the cell 6 to move away from or closer to the current collector 7. When the cell 6 and current collector 7 are placed on the cell fixture 1 and current collector fixture 2 respectively, the cell fixture 1 is far from the current collector fixture 2. When the cell 6 and current collector 7 are placed on the cell fixture 1 and current collector fixture 2 respectively, there is a certain distance between the cell 6 and current collector 7, making it easier to place them on the cell fixture 1 and current collector fixture 2. After the cell 6 and current collector 7 are placed on the cell fixture 1 and current collector fixture 2, the first driving component 3 drives the cell fixture 1 to translate, causing the cell 6 to move closer to the current collector 7, so that the current collector 7 is firmly attached to one end of the cell 6, and then welding is performed. This avoids the problem of incomplete welding caused by a large distance between the cell 6 and current collector 7 during welding.

[0034] The battery cell fixture 1 includes a base 13, at least two clamping plates 12, and a second driving member 11. Preferably, there are three clamping plates 12, which are disposed on the base 13. The second driving member 11 drives the three clamping plates 12 to move on the base 13, adjusting the distance between the clamping plates 12 and the positioning line 15. The three clamping plates 12 clamp the battery cell 6 by moving on the base 13. Specifically, the second driving member 11 first drives the three clamping plates 12 away from the positioning line 15, making the area enclosed by the three clamping plates 12 larger, thus allowing the battery cell 6 to easily enter this area. After the battery cell 6 enters the area enclosed by the three clamping plates 12, the second driving member 11 drives the three clamping plates 12 to move on the base 13, reducing the distance between the three clamping plates 12 and the positioning line 15, thereby clamping the battery cell 6. Furthermore, the distance between the three clamping plates 12 and the positioning line 15 is reduced synchronously, meaning that while reducing the distance between the three clamping plates 12 and the positioning line 15, the distances between each clamping plate 12 and the positioning line 15 are kept consistent. This ensures that when multiple cylindrical battery cells 6 of various sizes are clamped on the battery cell fixture 1, the central axis of each battery cell 6 can coincide with the positioning line 15, guaranteeing precise positioning of the cylindrical battery cells 6 of each size.

[0035] Three clamping plates 12 are evenly arranged around the base 13 with the positioning line 15 as the central axis. This even arrangement on the base 13 makes the cell fixture 1 more stable when clamping the cell 6, and also makes the compressive force on the cell 6 more uniform. The clamping surfaces of the three clamping plates 12 match and fit the side of the cell 6. Specifically, the side of the cylindrical cell 6 is curved. Setting the clamping surfaces of the clamping plates 12 to match the side of the cell 6 increases the contact area between the clamping plates 12 and the cell 6, reducing the compressive pressure on the cell 6, thus protecting the cell 6 and improving the stability of clamping the cell 6. Furthermore, after the battery cell 6 is clamped by the battery cell fixture 1, the compressive force on the battery cell 6 is along the radial direction of the battery, and the three clamping plates 12 move along the radial direction of the battery cell 6 on the base 13. This improves the stress situation of the battery cell 6 when clamping it, and also avoids friction damage to the surface of the battery cell 6 caused by the clamping plates 12.

[0036] The cylindrical battery welding equipment also includes a placement platform 4, which has a placement surface for placing the battery cell 6. The placement surface is the top surface of the placement platform 4. The placement platform 4 is positioned in the gap between the clamping plates 12. The placement platform 4 is used to place the battery cell 6, and the battery cell fixture 1 is used to clamp the battery cell 6 on the placement platform 4. Specifically, the placement platform 4 is located below the battery cell fixture 1 and in the gap between the two clamping plates 12. When placing the battery cell 6, the battery cell 6 is first placed on the placement platform 4. At this time, the battery cell fixture 1 is driven away from the current collector 7 by the first driving member 3, so that the battery cell 6 is not interfered with by the clamping plates 12 when it is placed on the placement platform 4. After the battery cell 6 is placed on the placement platform 4, the first driving member 3 drives the battery cell fixture 1 to move along the positioning line 15 towards the current collector 7, so that the battery cell 6 enters the clamping area of ​​the battery cell fixture 1, that is, the battery cell 6 is located between the three clamping plates 12. Then, the second driving member 11 drives the clamping plates 12 to move and clamp the battery cell 6. When the clamping plate 12 clamps the battery cell 6, the battery cell 6 first contacts the clamping plates 12 on both sides of the placement platform 4 and is lifted by the clamping plates 12 on both sides of the placement platform 4, so that the battery cell 6 is separated from the placement platform 4, and then is clamped and fixed by the three clamping plates 12.

[0037] The placement platform 4 has a curved surface. This curved surface abuts against the battery cell 6, preventing the battery cell 6 from rolling off the platform. Furthermore, the curved surface of the placement platform 4 is designed to match the curved surface of the side of the battery cell 6, making the placement of the battery cell 6 more stable. The battery cell fixture 1 clamps the battery cell 6 from the placement platform 4.

[0038] The battery cell fixture 1 has an open state and a closed state. The battery cell fixture 1 includes: at least two lower clamping plates 122, with the side surface of the lower clamping plates 122 facing the positioning line 15 serving as a clamping surface; at least one upper clamping plate 121, with the upper clamping plate 121 and the lower clamping plate 122 arranged around the positioning line 15, and the upper clamping plate 121 located above the placement surface; and a second driving member 11, with the lower clamping plates 122 and the upper clamping plate 121 connected to the second driving member 11, which drives the lower clamping plates 122 and the upper clamping plate 121 to move, so that the battery cell fixture 1 switches between an open state and a closed state. When the battery cell fixture 1 is in the open state, the lower clamping plates 122 are located on both sides of the placement surface, and at least a portion of the clamping surface is located below the placement surface. When the battery cell fixture 1 is in the closed state, the bottom end of the clamping surface is located above the placement surface. In the open state, the battery cell 6 is placed on the placement platform 4, and there is no contact between the lower clamping plate 122 and the battery cell 6. When switching from the open state to the switching state, the lower clamping plate 122 retracts and rises, lifting the battery cell 6 placed on the placement platform 4, and together with the upper clamping plate 121, positions the battery cell 6. In specific operation, the first driving member 3 moves the battery cell fixture 1 and the current collector fixture 2 away from each other, and the second driving member 11 opens the clamping plate 12. At this time, the battery cell 6 is placed on the placement platform 4. The second driving member 11 drives the clamping plate 12 to retract and clamp the battery cell 6 from the placement platform 4 for positioning. Finally, the first driving member 3 drives the battery cell fixture 1 to move closer to the current collector fixture 2 to complete the positioning of the battery cell 6 and the current collector 7.

[0039] The length of the upper clamping plate 121 is less than the length of the lower clamping plate 122. This ensures that the upper clamping plate 121 does not obstruct the placement of the battery cell 6. This allows the first driving member 3 to drive the battery cell fixture 1 a short distance away from the current collector fixture 2 before placing the battery cell 6, so that the battery cell 6 can be placed on the placement platform 4.

[0040] The collector plate fixture 2 also includes a limiting block 23 and a third driving member 24. The third driving member 24 is used to drive the limiting block 23 to move, so that the limiting block 23 adjusts the position of the cover plate 9. The position of the cover plate 9 is adjusted by the limiting block 23. The cover plate 9 is fixedly connected to the collector plate 7. The limiting block 23 is driven to move by the third driving member 24. When the limiting block 23 moves, it drives the collector plate 7 to rotate relative to the positioning post 22 through abutment with the cover plate 9, so that the cover plate 9 is located in a fixed position on the collector plate 7. Specifically, the cover plate 9 is located directly below the collector plate 7, so that when the collector plate 7 is welded to the battery cell 6 and enters the next process, it is not necessary to rotate the battery cell 6 to adjust the position of the cover plate 9.

[0041] Reference Figure 2The battery cell fixture 1 is equipped with a positioning pin 14, and the current collector fixture 2 is equipped with a pin hole 26 that matches the positioning pin 14. When the first driving member 3 drives the battery cell fixture 1 to approach the current collector fixture 2, the positioning pin 14 is inserted into the pin hole 26. By setting the positioning pin 14, it is ensured that when the battery cell 6 and the current collector 7 are close, the positioning line 15 of the battery cell fixture 1 coincides with the central axis of the positioning post 22 on the current collector fixture 2. This allows for accurate positioning between the battery cell 6 and the current collector 7.

[0042] The cylindrical battery welding equipment also includes a slide rail 5, on which the cell fixture 1 is slidably mounted and slides along the positioning line 15. The slide rail 5 constrains the movement of the cell fixture 1, making its movement smoother and allowing it to move more accurately along the positioning line 15.

[0043] Reference Figure 6 The battery cell 6 has a through hole 61, and a housing 8 is fitted over the battery cell 6. The positioning post 22 cooperates with the through hole 61 to position the battery cell 6. In some working conditions, when the current collector 7 is welded to the battery cell 6, the battery cell 6 is already installed inside the housing 8. When the housing 8 is fitted over the outside of the battery cell 6, the clamping plate 12 of the battery cell fixture 1 can only clamp the battery cell 6 indirectly from the outside of the housing 8. There is a certain gap between the battery cell 6 and the housing 8. Therefore, when positioning the battery cell 6, a certain deviation will occur between the central axis of the battery cell 6 and the positioning line 15. This makes it impossible for the central axis of the battery cell 6 to coincide precisely with the positioning line 15, resulting in a positioning deviation between the battery cell 6 and the current collector 7. Therefore, the positioning post 22 cooperates with the through hole 61 on the battery cell 6 to further calibrate the position of the battery cell 6, making the position between the current collector 7 and the battery cell 6 more accurate.

[0044] Reference Figure 3 The positioning post 22 is a cylinder that matches the through hole 61. The positioning post 22 includes an adjusting part 25, which is located at the end of the positioning post 22 closest to the battery cell 6. The cross-section of the adjusting part 25 decreases as it approaches the battery cell 6 along the central axis of the positioning post. To avoid potential damage to the battery cell 6 when the positioning post 22 engages with the through hole 61, an adjusting part 25 with a gradually decreasing shaft diameter is provided at one end of the positioning post. When the positioning post 22 enters the through hole 61 and engages with the battery cell 6, the end with the smaller shaft diameter enters the through hole 61 first, and the shaft diameter of the positioning post 22 gradually increases as it enters the through hole 61, eventually resulting in a tight fit between the positioning post 22 and the through hole 61. The gradually increasing shaft diameter of the adjusting part 25 allows for fine-tuning of the position of the battery cell 6. This further adjusts the positioning between the battery cell 6 and the current collector 7, while also preventing damage to the battery cell 6 from the positioning post 22.

[0045] In the description of this invention, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A cylindrical battery welding apparatus, characterized by, The cylindrical battery welding equipment is used to weld current collectors onto the battery cell, and includes: A battery cell fixture is used to connect the battery cell. The battery cell fixture is provided with a positioning straight line. When the battery cell is connected to the battery cell fixture, the central axis of the battery cell coincides with the positioning straight line. The battery cell fixture includes clamping plates and a second driving member. At least two clamping plates are provided. Multiple clamping plates are arranged around the positioning straight line and are spaced apart. The second driving member is connected to the clamping plates. The second driving member can drive the multiple clamping plates to retract towards each other and can also drive the multiple clamping plates to open towards each other. A collector plate fixture includes a positioning post and an adsorption surface. The central axis of the positioning post coincides with the positioning line. The collector plate has a positioning hole that matches the positioning post, allowing the positioning post to pass through the positioning hole. The adsorption surface has multiple adsorption holes. The positioning post is connected to the adsorption surface and protrudes relative to the adsorption surface. The adsorption holes are located on the periphery of the positioning post. A cover plate is connected to the collector plate fixture. The collector plate fixture also includes a limiting block and a third driving member connected to each other. The third driving member is used to drive the limiting block to move so that the limiting block clamps the cover plate. The first driving member is used to drive the battery cell fixture to translate along the central axis of the positioning post, so as to change the distance between the battery cell fixture and the current collector fixture. The first driving member is also used to drive the second driving member to translate along the central axis of the positioning post. A placement platform has a placement surface on top for placing the battery cell, and a battery cell fixture for clamping the battery cell on the placement platform; The positioning pin and positioning hole are interlocking, with one of the positioning pin and the positioning hole being disposed on the cell fixture and the other being disposed on the current collector fixture. The central axis of the positioning hole coincides with the central axis of the positioning pin, and the central axis of the positioning pin is parallel to the positioning line.

2. The cylindrical battery welding apparatus according to claim 1, characterized by, The battery cell fixture has an open state and a retracted state, and the battery cell fixture includes: The lower clamping plate is provided with at least two, and the side surface of the lower clamping plate facing the positioning line is the clamping surface; An upper clamping plate is provided, and the upper clamping plate and the lower clamping plate are arranged around the positioning line, with the upper clamping plate located above the placement surface; The second driving member is connected to the lower clamping plate and the upper clamping plate. The second driving member is used to drive the lower clamping plate and the upper clamping plate to move so that the battery cell fixture switches between an open state and a closed state. When the battery cell fixture is in the open state, the lower clamping plates are located on both sides of the placement surface, and at least a portion of the clamping surface is located below the placement surface; when the battery cell fixture is in the closed state, the bottom end of the clamping surface is located above the placement surface, and the upper clamping plate and the lower clamping plate together clamp the battery cell.

3. The cylindrical battery welding apparatus of claim 1, wherein, The placement surface is a concave arc surface.

4. The cylindrical battery welding apparatus according to claim 2, characterized by, The length of the upper clamping plate is less than the length of the lower clamping plate.

5. The cylindrical battery welding equipment according to claim 1, characterized in that, The positioning post includes an adjustment section, which is disposed at one end of the positioning post near the cell fixture. The cross-sectional area of ​​the adjustment section gradually decreases along the direction from the current collector fixture to the cell fixture.

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