Battery cell welding and fixing device for battery pack processing and welding method thereof

Abstract

This invention discloses a battery cell welding and fixing device for battery pack processing, belonging to the technical field of battery pack welding processing. It includes a fixed base, a first limiting frame, and a second limiting frame. Both the first and second limiting frames are movably installed on the inner side of the upper end of the fixed base. The second limiting frame is movably installed above the first limiting frame, forming a grid-like structure. Both the first and second limiting frames include a first clamping plate and a second clamping plate. The first clamping plate is movably installed on one side of the second clamping plate. A lifting frame is movably installed on the upper end of the fixed base above the first and second limiting frames. Two sets of sliding pressure plates are movably installed on the lower outer surface of the lifting frame. This grid-like adjustable limiting and fixing structure allows for the limiting and fixing of any number of battery cells, improving the battery pack welding and fixing effect and preventing short circuits and incomplete welds.

Description

Technical Field

[0001] This invention belongs to the technical field of battery pack welding and processing, specifically a battery pack cell welding and fixing device and its welding method. Background Technology

[0002] Battery pack welding equipment is mainly used to weld electrical connection structures and packaging structures in battery modules and battery packs to achieve electrical connections between battery cells and to seal and protect the battery. It primarily uses welding to connect several sets of wires in series via connecting plates. These connecting plates are used to directly connect the tabs of adjacent battery cells, enabling series or parallel connections. The materials are mostly pure copper, pure aluminum, or copper-aluminum composite sheets.

[0003] Patent document CN118023702A discloses a battery cell welding device and a battery cell welding method. The battery cell welding device includes: a rotary table, a steel shell fixture, and a welding assembly. The rotary table can rotate along its central axis. Multiple steel shell fixtures are arranged circumferentially along the rotary table. The steel shell fixtures are used to clamp the battery cell and the steel shell. Driven by the rotary table, the steel shell fixtures move the steel shell and the battery cell to the welding station. The steel shell fixtures can adjust the position of the battery cell and the steel shell in the vertical direction so that the steel shell and the battery cell are adjusted to a preset welding position. The welding assembly is set at the welding station. The welding assembly includes a welding head, which is used to emit a laser. The laser is used to weld the steel shell and the battery cell.

[0004] Existing cell welding devices have certain shortcomings in use. Traditional cell welding devices only have welding functions, using laser welding to weld and fix the connecting pieces and cells. However, a battery pack itself consists of several groups of cells, which need to be neatly arranged during welding. Misalignment of any cell will cause poor welding and short circuits, making the battery pack unable to work properly. This can lead to an open circuit in the entire battery pack circuit, preventing the battery pack from outputting current and preventing the vehicle or equipment from starting. Secondly, traditional cell welding and fixing devices can only fix the cells by limiting their position. However, battery pack welding involves welding the cells to the connecting pieces. Misalignment of the connecting pieces will also affect the welding effect of the battery pack. They lack a connecting piece positioning structure and have limited functionality. Summary of the Invention

[0005] This invention provides a battery pack cell welding and fixing device and its welding method, which can solve the problem in the prior art where the battery pack itself is composed of several groups of cells. During welding and fixing, these groups of cells need to be arranged neatly. Misalignment of any cell will cause poor welding and short circuit, making the battery pack unable to work properly. This can lead to an open circuit in the entire battery pack circuit, the battery pack not outputting current, and the vehicle or equipment not starting. A battery pack processing cell welding and fixing device includes a fixed base, a first limiting frame, and a second limiting frame. The first and second limiting frames are movably installed on the inner side of the upper end of the fixed base, and the second limiting frame is movably installed above the first limiting frame. The first and second limiting frames are arranged in a grid-like structure. The first and second limiting frames each include a first clamping plate and a second clamping plate. The first clamping plate is movably installed on one side of the second clamping plate. A lifting frame is movably installed on the upper end of the fixed base above the first and second limiting frames. Two sets of sliding pressure plates are movably installed on the lower outer surface of the lifting frame.

[0006] As a further technical solution of the present invention, the first clamping plate and the fixed base, as well as the second clamping plate and the fixed base, are movably connected by a sliding rod. The inner side of the fixed base is provided with a sliding groove for use with the first clamping plate and the second clamping plate. The first clamping plate and the second clamping plate are driven by a linear motor, so that the first clamping plate and the second clamping plate move towards each other along the sliding rod. The first limiting frame and the second limiting frame are arranged in a grid shape, so that the upper and lower sets of the first clamping plate and the second clamping plate respectively limit and fix the several sets of battery cells in sequence and on both sides, so as to avoid loosening when several sets of battery cells and connecting pieces are welded in series.

[0007] As a further technical solution of the present invention, an elastic clip is elastically installed on one side of both the first clamping plate and the second clamping plate, and a telescopic groove for use with the elastic clip is provided on the inner side of both the first clamping plate and the second clamping plate. By using the elastic clip, the first clamping plate and the second clamping plate can elastically clamp the battery cell to avoid damage to the battery cell, while improving the fixing effect of the first clamping plate and the second clamping plate.

[0008] As a further technical solution of the present invention, the first clamping plate and the elastic clip, as well as the second clamping plate and the elastic clip, are all elastically connected by a number of sets of transverse springs.

[0009] As a further technical solution of the present invention, a movable slide frame is movably installed on the inner side of the lifting frame, and a welding torch for welding battery cells and connecting pieces is movably installed on the inner side of the movable slide frame. The welding torch and the movable slide frame are movably connected by a slide block. The slide block is driven by a linear motor, so that the slide block moves within the movable slide frame. At the same time, the movable slide frame and the welding torch are also driven by a linear motor to complete the bidirectional position adjustment of the welding torch, so that the welding torch can be adjusted according to the welding position of the battery cell.

[0010] As a further technical solution of the present invention, the lifting frame and the fixed base are driven by a lifting rod. Two sets of docking sliders are fixedly installed on the upper outer surface of the sliding pressure plate. The sliding pressure plate and the bottom of the lifting frame are slidably connected by the docking sliders. During operation, the connecting piece is placed on the upper end of the battery cell to be welded. When the lifting frame drives the welding gun to move down to perform the welding operation, the lifting frame synchronously drives the two sets of sliding pressure plates to move down, so that the two sets of sliding pressure plates respectively press and fix the two ends of the connecting piece.

[0011] As a further technical solution of the present invention, an elastic pressure plate is elastically installed on the inner side of the lower end of the sliding pressure plate, and the sliding pressure plate and the elastic pressure plate are elastically connected by a vertical spring. During operation, the vertical spring is used to make the lower end of the sliding pressure plate have an elastic pressing and fixing structure, which can improve the fixing effect of the sliding pressure plate on the connecting piece.

[0012] As a further technical solution of the present invention, a push-pull rod is fixedly installed on the outer surface of one end of the sliding pressure plate, and several sets of limiting sleeves are movably installed on the outer surface of the lower end of the elastic pressure plate. The push-pull rod can be used to push the elastic pressure plate to move, and the distance between the two sets of sliding pressure plates can be adjusted according to the length of the connecting piece.

[0013] As a further technical solution of the present invention, the limiting sleeve and the elastic pressure plate are slidably connected by a mating part. A fastening bolt is provided on one side of the limiting sleeve, and a beveled clamp head is movably installed at the lower end of the limiting sleeve. The limiting sleeve and the beveled clamp head are driven by an adjusting bolt. During operation, the limiting sleeve can be used to position a single connecting piece, avoiding tilting of the connecting piece when it is fixed.

[0014] A method for welding battery cells for battery pack processing, applied to the battery cell welding and fixing device for battery pack processing as described in claim 1, includes the following steps: Step 1: After the battery cells are neatly stacked, they are placed on the upper end of the fixed base. Using the first and second limiting frames, the front, back and sides of several groups of battery cells are limited and fixed by the upper and lower sets of first and second clamping plates. Step 2: Place the connecting piece to be welded on the upper end of the battery cell. Use the lifting rod to drive the lifting frame to move down, so that the lifting frame moves the sliding pressure plate and welding gun down. Use the elastic pressure plate of the sliding pressure plate and the limiting sleeve to press and fix the two ends of the connecting piece. Fix the connecting piece and the battery cell in the middle to complete the initial fixation of the battery cell. Then move the sliding pressure plate outward and use the welding gun to weld and fix the remaining battery cell and connecting piece.

[0015] The beneficial effects of the present invention are as follows: When the battery pack cell welding and fixing device is used, the present invention, through the first limiting frame and the second limiting frame, has a grid-shaped adjustable limiting and fixing structure, which can complete the limiting and fixing of any number of cells, improve the battery pack welding and fixing effect, and avoid short circuits and poor welding. In daily operation, the battery cells are neatly stacked and placed on the upper end of the fixed base. The first and second clamping plates are driven by linear motors, causing them to move towards each other along the slide rod. The first and second limiting frames, arranged in a grid pattern, limit and fix the front and rear and sides of several groups of battery cells, preventing loosening when welding and connecting pieces together. The elastic clips allow the first and second clamping plates to elastically clamp the battery cells, preventing damage and improving the fixing effect. The first and second limiting frames, along with the upper and lower clamping plates, limit and fix the front and rear and sides of several groups of battery cells. The slide is driven by a linear motor, moving within the moving slide frame. The moving slide frame and the welding gun are also driven by a linear motor, allowing for bidirectional position adjustment of the welding gun. This allows the welding gun to be adjusted according to the welding position of the battery cells. The welding gun is used to weld and fix the battery cells and connecting pieces using laser welding. By setting a sliding pressure plate, the use of the first and second limit frames is optimized when the battery pack cell welding and fixing device is used, so that the upper part has a connecting piece tight-pressing and fixing structure. The limiting and fixing of the connecting piece can be completed simultaneously during battery pack welding, avoiding tilting and improving the welding accuracy of the battery pack. During operation, the connecting piece is placed on top of the battery cell to be welded. When the lifting frame drives the welding gun downwards for welding, the lifting frame simultaneously drives two sets of sliding pressure plates downwards, so that the two sets of sliding pressure plates press and fix the two ends of the connecting piece respectively. The vertical spring setting makes the lower end of the sliding pressure plate have an elastic pressing and fixing structure, which can improve the fixing effect of the sliding pressure plate on the connecting piece. The push-pull rod setting can push the elastic pressure plate to move. Adjust the distance between the two sets of sliding pressure plates according to the length of the connecting piece, place the connecting piece to be welded on top of the battery cell, and use the lifting rod to drive the lifting frame downwards, so that the lifting frame drives the sliding pressure plate and welding gun downwards. The elastic pressure plate of the sliding pressure plate, together with the limiting sleeve, presses and fixes the two ends of the connecting piece. The connecting piece and the battery cell are fixed in the middle, completing the initial fixation of the battery cell. Then the sliding pressure plate is moved outwards, and the welding gun is used to weld and fix the remaining battery cell and connecting piece. Attached Figure Description To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is an overall structural diagram of the first limiting frame in this invention; Figure 3 This is an overall structural diagram of the sliding pressure plate in this invention; Figure 4 This is an overall structural diagram of the limiting sleeve in this invention.

[0017] In the diagram: 1. Fixed base; 2. First limiting frame; 3. Second limiting frame; 4. Lifting frame; 5. Battery cell; 6. Sliding pressure plate; 7. Moving slide frame; 8. Welding torch; 9. Slide rod; 10. Elastic retaining strip; 11. First clamping plate; 12. Horizontal spring; 13. Second clamping plate; 14. Connecting slider; 15. Vertical spring; 16. Elastic pressure plate; 17. Push-pull rod; 18. Limiting sleeve; 19. Fastening bolt; 20. Adjusting bolt; 21. Angled clamp; 22. Connecting part. Detailed Implementation

[0018] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] like Figures 1-4 As shown, a battery pack processing cell welding and fixing device includes a fixed base 1, a first limiting frame 2, and a second limiting frame 3. The first limiting frame 2 and the second limiting frame 3 are both movably installed on the inner side of the upper end of the fixed base 1. The second limiting frame 3 is movably installed above the first limiting frame 2. The first limiting frame 2 and the second limiting frame 3 form a grid-like structure. The first limiting frame 2 and the second limiting frame 3 each include a first clamping plate 11 and a second clamping plate 13. The first clamping plate 11 is movably installed on one side of the second clamping plate 13. A lifting frame 4 is movably installed on the upper end of the fixed base 1 above the first limiting frame 2 and the second limiting frame 3. Two sets of sliding pressure plates 6 are movably installed on the outer surface of the lower end of the lifting frame 4.

[0020] The first clamping plate 11 and the fixed base 1, as well as the second clamping plate 13 and the fixed base 1, are movably connected by a sliding rod 9. The inner side of the fixed base 1 is provided with a sliding groove that works with the first clamping plate 11 and the second clamping plate 13. The first clamping plate 11 and the second clamping plate 13 are driven by a linear motor, so that the first clamping plate 11 and the second clamping plate 13 move towards each other along the sliding rod 9. The first limiting frame 2 and the second limiting frame 3 are arranged in a grid shape, so that the upper and lower sets of the first clamping plate 11 and the second clamping plate 13 respectively limit and fix the several sets of battery cells 5 in sequence and on both sides, so as to avoid loosening when the several sets of battery cells 5 and the connecting pieces are welded in series.

[0021] Elastic clips 10 are elastically installed on one side of the first clamping plate 11 and the second clamping plate 13. The inner side of the first clamping plate 11 and the second clamping plate 13 is provided with telescopic grooves that cooperate with the elastic clips 10. By using the elastic clips 10, the first clamping plate 11 and the second clamping plate 13 can elastically clamp the battery cell 5 to avoid damage to the battery cell 5, while improving the fixing effect of the first clamping plate 11 and the second clamping plate 13.

[0022] The first clamping plate 11 and the elastic clip 10, as well as the second clamping plate 13 and the elastic clip 10, are all elastically connected by several sets of transverse springs 12.

[0023] A movable slide frame 7 is movably installed inside the lifting frame 4. A welding torch 8 for welding the battery cell 5 and the connecting piece is movably installed inside the movable slide frame 7. The welding torch 8 and the movable slide frame 7 are movably connected by a slide block. The slide block is driven by a linear motor, so that the slide block moves within the movable slide frame 7. At the same time, the movable slide frame 7 and the welding torch 8 are also driven by a linear motor to complete the bidirectional position adjustment of the welding torch 8, so that the welding torch 8 can be adjusted according to the welding position of the battery cell 5.

[0024] The lifting frame 4 and the fixed base 1 are driven by a lifting rod. Two sets of docking sliders 14 are fixedly installed on the upper outer surface of the sliding pressure plate 6. The sliding pressure plate 6 and the bottom of the lifting frame 4 are slidably connected by the docking sliders 14. During operation, the connecting piece is placed on the upper end of the electrode 5 to be welded. When the lifting frame 4 drives the welding gun 8 to move down to perform the welding operation, the lifting frame 4 synchronously drives the two sets of sliding pressure plates 6 to move down, so that the two sets of sliding pressure plates 6 respectively press and fix the two ends of the connecting piece.

[0025] An elastic pressure plate 16 is elastically installed on the inner side of the lower end of the sliding pressure plate 6. The sliding pressure plate 6 and the elastic pressure plate 16 are elastically connected by a vertical spring 15. During operation, the vertical spring 15 is used to make the lower end of the sliding pressure plate 6 have an elastic pressing and fixing structure, which can improve the fixing effect of the sliding pressure plate 6 on the connecting piece.

[0026] A push-pull rod 17 is fixedly installed on the outer surface of one end of the sliding pressure plate 6, and several sets of limiting sleeves 18 are movably installed on the outer surface of the lower end of the elastic pressure plate 16. The elastic pressure plate 16 can be moved by using the push-pull rod 17, and the distance between the two sets of sliding pressure plates 6 can be adjusted according to the length of the connecting piece.

[0027] The limiting sleeve 18 and the elastic pressure plate 16 are slidably connected by the mating part 22. A fastening bolt 19 is provided on one side of the limiting sleeve 18. A beveled clamp head 21 is movably installed at the lower end of the limiting sleeve 18. The limiting sleeve 18 and the beveled clamp head 21 are driven by the adjusting bolt 20. During operation, the limiting sleeve 18 can be used to position a single connecting piece, avoiding tilting of the connecting piece when it is fixed.

[0028] A method for welding battery cells for battery pack processing, applied to a battery cell welding and fixing device for battery pack processing, includes the following steps: Step 1: After neatly arranging the battery cells 5, place them on the upper end of the fixed base 1. Using the first limiting frame 2 and the second limiting frame 3, the front, back and sides of several sets of battery cells 5 are limited and fixed by the upper and lower sets of first clamping plates 11 and second clamping plates 13. Step 2: Place the connecting piece to be welded on the upper end of the battery cell 5. Use the lifting rod to drive the lifting frame 4 to move down, so that the lifting frame 4 drives the sliding pressure plate 6 and the welding gun 8 to move down. Use the elastic pressure plate 16 of the sliding pressure plate 6 and the limiting sleeve 18 to press and fix the two ends of the connecting piece. Fix the connecting piece and the battery cell 5 in the middle to complete the initial fixation of the battery cell 5. Then move the sliding pressure plate 6 outward and use the welding gun 8 to weld and fix the remaining battery cell 5 and connecting piece.

[0029] A battery pack processing cell welding and fixing device is disclosed. In use, the battery cells 5 are neatly stacked and placed on the upper end of a fixing base 1. A first clamping plate 11 and a second clamping plate 13 are driven by a linear motor, causing them to move towards each other along a sliding rod 9. A grid-shaped first limiting frame 2 and a second limiting frame 3 limit and fix the upper and lower sets of first clamping plates 11 and 13 to the front and rear, as well as to both sides, preventing loosening when welding the battery cells 5 and connecting pieces in series. An elastic retaining strip 10 allows the first clamping plates 11 and 13 to spring back. The clamping mechanism secures the battery cell 5 to prevent damage and enhances the fixing effect of the first clamping plate 11 and the second clamping plate 13. The first limiting frame 2 and the second limiting frame 3, along with the upper and lower sets of the first clamping plate 11 and the second clamping plate 13, limit and fix several sets of battery cells 5 at the front, back, and sides. The slide block is driven by a linear motor, allowing it to move within the moving slide frame 7. At the same time, the moving slide frame 7 and the welding torch 8 are also driven by a linear motor to achieve bidirectional position adjustment of the welding torch 8. This allows the welding torch 8 to be adjusted according to the welding position of the battery cell 5. The welding torch 8 is used to weld and fix the battery cell 5 and the connecting piece by laser welding. During operation, the connecting piece is placed on top of the electrode cell 5 to be welded. When the lifting frame 4 drives the welding gun 8 to move downward for welding, the lifting frame 4 simultaneously drives the two sets of sliding pressure plates 6 to move downward, so that the two sets of sliding pressure plates 6 respectively press and fix the two ends of the connecting piece. The vertical spring 15 provides an elastic pressing and fixing structure at the lower end of the sliding pressure plate 6, which can improve the fixing effect of the sliding pressure plate 6 on the connecting piece. The push-pull rod 17 can push the elastic pressure plate 16 to move according to the length of the connecting piece. Adjust the distance between the two sets of sliding pressure plates 6, place the connecting piece to be welded on the upper end of the battery cell 5, use the lifting rod to drive the lifting frame 4 to move down, so that the lifting frame 4 drives the sliding pressure plate 6 and the welding gun 8 to move down, use the elastic pressure plate 16 of the sliding pressure plate 6 in conjunction with the limiting sleeve 18 to press and fix the two ends of the connecting piece, and use the battery cell 5 to fix the connecting piece and the battery cell 5 in the middle, thus completing the initial fixation of the battery cell 5. Then move the sliding pressure plate 6 outward, and use the welding gun 8 to weld and fix the remaining battery cell 5 and the connecting piece.

[0030] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A cell welding fixing device for battery pack processing, characterized by, The device includes a fixed base (1), a first limiting frame (2), and a second limiting frame (3). The first limiting frame (2) and the second limiting frame (3) are both movably installed on the inner side of the upper end of the fixed base (1). The second limiting frame (3) is movably installed above the first limiting frame (2). The first limiting frame (2) and the second limiting frame (3) are arranged in a grid shape. The first limiting frame (2) and the second limiting frame (3) both include a first clamping plate (11) and a second clamping plate (13). The first clamping plate (11) is movably installed on one side of the second clamping plate (13). A lifting frame (4) is movably installed on the upper end of the fixed base (1) above the first limiting frame (2) and the second limiting frame (3). Two sets of sliding pressure plates (6) are movably installed on the lower outer surface of the lifting frame (4).

2. The electric core welding and fixing device for battery pack processing according to claim 1, characterized in that, The first clamping plate (11) and the fixed base (1) and the second clamping plate (13) and the fixed base (1) are all movably connected by a sliding rod (9). The inner side of the fixed base (1) is provided with a sliding groove for use with the first clamping plate (11) and the second clamping plate (13).

3. The battery pack processing cell welding and fixing device according to claim 2, characterized in that, One side of the first clamping plate (11) and the second clamping plate (13) is elastically fitted with an elastic clip (10), and the inner side of the first clamping plate (11) and the second clamping plate (13) is provided with a telescopic groove for use with the elastic clip (10).

4. The battery pack processing cell welding and fixing device according to claim 3, characterized in that, The first clamping plate (11) and the elastic clip (10), as well as the second clamping plate (13) and the elastic clip (10), are all elastically connected by several sets of transverse springs (12).

5. The battery pack processing cell welding and fixing device according to claim 1, characterized in that, The inner side of the lifting frame (4) is movably mounted with a sliding frame (7), and the inner side of the sliding frame (7) is movably mounted with a welding gun (8) for welding the battery cell (5) and the connecting piece. The welding gun (8) and the sliding frame (7) are movably connected by a sliding block.

6. The battery pack processing cell welding and fixing device according to claim 5, characterized in that, The lifting frame (4) and the fixed base (1) are driven by a lifting rod. Two sets of docking sliders (14) are fixedly installed on the upper outer surface of the sliding pressure plate (6). The bottom of the sliding pressure plate (6) and the lifting frame (4) are slidably connected by the docking sliders (14).

7. The battery pack cell welding and fixing device according to claim 6, characterized in that, An elastic pressure plate (16) is elastically installed on the inner side of the lower end of the sliding pressure plate (6), and the sliding pressure plate (6) and the elastic pressure plate (16) are elastically connected by a vertical spring (15).

8. The battery pack processing cell welding and fixing device according to claim 7, characterized in that, A push-pull rod (17) is fixedly installed on the outer surface of one end of the sliding pressure plate (6), and several sets of limiting sleeves (18) are movably installed on the outer surface of the lower end of the elastic pressure plate (16).

9. The battery pack processing cell welding and fixing device according to claim 8, characterized in that, The limiting sleeve (18) and the elastic pressure plate (16) are slidably connected by a mating part (22). A fastening bolt (19) is provided on one side of the limiting sleeve (18). A beveled head (21) is movably installed at the lower end of the limiting sleeve (18). The limiting sleeve (18) and the beveled head (21) are driven by an adjusting bolt (20).

10. A method for welding battery cells in battery pack processing, applied to the battery cell welding and fixing device for battery pack processing as described in claim 1, characterized in that, Includes the following steps: Step 1: After the battery cells (5) are neatly arranged, they are placed on the upper end of the fixed base (1). The first limiting frame (2) and the second limiting frame (3) are used to limit and fix the front, back and sides of several sets of battery cells (5) through the upper and lower first clamping plates (11) and the second clamping plates (13). Step 2: Place the connecting piece to be welded on the upper end of the battery cell (5), and use the lifting rod to drive the lifting frame (4) to move down, so that the lifting frame (4) drives the sliding pressure plate (6) and the welding gun (8) to move down. Use the elastic pressure plate (16) of the sliding pressure plate (6) in conjunction with the limiting sleeve (18) to press and fix the two ends of the connecting piece. Fix the connecting piece and the battery cell (5) in the middle through the battery cell (5) to complete the initial fixation of the battery cell (5). Then move the sliding pressure plate (6) outward and use the welding gun (8) to weld and fix the remaining battery cell (5) and connecting piece.

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