Cap pressure welding device for lithium battery production

Abstract

The invention relates to the technical field of lithium battery production, in particular to a cap pressure welding device for lithium battery production, which comprises a processing table and a pressure welding mechanism arranged on the processing table, the processing table is provided with a blanking mechanism for welding to complete cap blanking, and a placing table is arranged below a discharge hopper of the blanking mechanism. A fixing frame used for storing a collecting box is fixedly connected to the top of the containing table, a moving table is arranged at the end, away from the fixing frame, of the side wall of the containing table, a transfer trolley used for containing the collecting box is arranged on the moving table, and a moving mechanism used for driving the transfer trolley to move at a fixed distance is arranged on the moving table. The collecting box can be automatically replaced and can be automatically placed on the transfer trolley, time and labor are saved, workers do not need to be on duty beside the machine for a long time, only the transfer trolley needs to be pushed away regularly, and the convenience performance of the device is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of lithium battery production, and in particular to a cap welding device for lithium battery production. Background Art

[0002] A lithium battery is a battery that uses lithium metal or lithium alloy as the negative electrode material and a non-aqueous electrolyte solution. During the assembly process of the lithium battery, the cap needs to be press-welded to the lithium battery. Press welding refers to a welding method in which a certain pressure is applied to the combined weldment under heating or unheating conditions to cause it to undergo plastic deformation or melt, and through recrystallization and diffusion, the atoms on the two separated surfaces are connected by forming a metallic bond.

[0003] A lithium battery cap welding device with publication number CN118385715A in the prior art places the battery cap inside the guide cylinder so that the battery cap at the lower end falls into the cap hole on the push plate. Starting the cylinder can push the push plate to move along the first guide groove, so that the push plate moves to just above the conveyor plate, so that the battery cap falls on the upper end of the battery on the conveyor plate. Starting the hydraulic cylinder allows the welder to perform cap welding on the battery, thereby realizing automated cap placement with high accuracy, avoiding the problem of cap welding failure caused by cap placement offset, and improving the production and processing efficiency of lithium batteries.

[0004] Although the welding efficiency of lithium battery caps is improved, there are still some problems in actual use. The caps that have been welded will fall into the collection box, but the welding device cannot automatically replace the collection box. When the collection box is full, workers need to replace it. In addition, the existing welding device has a high working efficiency, so the collection box is full in a short time, which requires workers to stay on duty at the machine for a long time to replace it. This is not only time-consuming and labor-intensive, but also greatly reduces the convenience of the device.

[0005] Therefore, a cap welding device for lithium battery production is proposed to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of the background technology and to propose a cap welding device for lithium battery production.

[0007] In order to achieve the above purpose, the technical solution adopted by the present invention is: a cap pressure welding device for lithium battery production, comprising a processing table and a pressure welding mechanism arranged on the processing table, the processing table is provided with a feeding mechanism for feeding the cap after welding, a placing table is provided below the discharge hopper of the feeding mechanism, a fixed frame for storing the collection box is fixedly connected to the top of the placing table, a moving table is provided on the side wall of the placing table and away from the fixed frame, a transfer vehicle for placing the collection box is provided on the moving table, and a moving machine for driving the transfer vehicle to move a fixed distance is provided on the moving table Structure, a pair of bottom plates are fixedly connected to the bottom of the placing table, a reciprocating screw is rotatably connected between the bottom plates, a sliding groove is opened in the middle position of the top of the placing table, a sliding block is threaded through the outer wall of the reciprocating screw, a pair of hinge plates are fixedly connected to the top of the sliding block, a push plate is rotatably connected between the hinge plates, the bottom end of the push plate side wall is fixedly connected to a limiting plate, one of the side walls of the bottom plate is fixedly connected to a driving motor, the output end of the driving motor passes through the side wall of the bottom plate and is fixedly connected to the side wall of the reciprocating screw, and a discharge port is opened at the bottom of the fixed frame near the baffle.

[0008] In the above technical solution, further, a guide rod is fixedly connected between the base plates, and the guide rod is arranged to penetrate the inner wall of the sliding block.

[0009] In the above technical solution, further, baffles are fixedly connected on both sides of the top of the placing table and below the discharge hopper on the unloading mechanism, a side opening is opened on the side of the fixed frame away from the discharge port, and the height of the push plate is higher than the top of the placing table, and a return spring is fixedly connected between the side wall of the limit plate and the top of the sliding block.

[0010] In the above technical scheme, further, the moving mechanism includes a moving frame, an inward groove is opened on the top of the moving platform, a top plate is arranged on the inner side of the groove, a moving groove is opened through the side wall of the groove, the moving frame is slidably connected to the inner side of the moving groove, and a pair of connecting rods are fixedly connected between the moving frame and the sliding block, the side wall of the moving frame is fixedly connected to the side plate, the top of the side plate is slidably connected to the moving rod, a plurality of transverse grooves are opened equidistantly on the bottom of the top plate, oblique grooves are opened between the plurality of transverse grooves, and both ends of the oblique grooves are connected with the ends away from the adjacent two transverse grooves, a card groove is opened on the inner side of the oblique groove and on the side away from the placing platform, and the top end of the moving rod is inserted into the inner side of one of the transverse grooves, and a limiting mechanism for limiting the position of the transfer vehicle is provided on the top plate.

[0011] In the above technical solution, further, sliding frames are provided on both sides of the bottom of the top plate, and the sliding frames are laterally slidably connected to the inner side of the groove, compression blocks are fixedly connected on both sides of the bottom of the top plate, and the compression blocks are slidably connected to the inner side of the sliding frame, and a pair of upper springs are fixedly connected between the inner side of the sliding frame and the bottom of the compression block, and one of the side walls of the sliding frame is fixedly connected to a pull rod and the pull rod is arranged through the movable groove.

[0012] In the above technical solution, further, a positioning plate is fixedly connected to the bottom of the moving rod, and a lower spring sleeved on the outside of the moving rod is fixedly connected between the top of the positioning plate and the bottom of the side plate, the top of the moving rod is set to a smooth arc surface, and the connection between the slot and the inclined slot is inclined.

[0013] In the above technical scheme, further, the limiting mechanism includes a lower frame, the lower frame is fixedly connected to the middle position of the top end of the top plate, and the bottom of the transfer vehicle and the upper frame are fixedly connected to the corresponding position of the lower frame, the inner side of the lower frame is slidably connected to a limiting block, the limiting block is inserted into the inner side of the upper frame, and a plurality of limiting springs are fixedly connected between the bottom end of the lower frame and the limiting block, and the side wall of the limiting block is inclined, and the side wall of the limiting block is fixedly connected to a release plate, and the release plate is arranged through the side wall of the lower frame.

[0014] In the above technical solution, further, inclined blocks are fixedly connected to both sides of the outer wall of the moving platform, and a fence is fixedly connected to the top of the moving platform and the side away from the placing platform, a touch sensor is fixedly connected through the inner side of the horizontal groove away from the side of the placing platform, and the touch sensor is arranged on the side away from the moving rod, the touch sensor is arranged on the side away from the top plate, an alarm is fixedly connected to the outer wall of the moving platform, and the touch sensor is electrically connected to the alarm through a controller.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention can not only automatically replace the collection box, but also automatically place the collection box on the transfer vehicle, which not only saves time and effort, but also does not require staff to be on duty at the machine for a long time. It only needs to push the transfer vehicle away regularly, which greatly improves the convenience of the device.

[0017] 2. Through the cooperation of the moving mechanism and the limiting mechanism, the present invention can automatically change the position of the collection box on the next transfer vehicle after the collection box is replaced, thereby further improving the convenience of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the front three-dimensional structure of the pressure welding device of the present invention;

[0019] Figure 2It is a schematic diagram of the three-dimensional structure of the placing platform and the moving platform of the present invention when viewed from above;

[0020] Figure 3 It is a schematic diagram of the full-cut three-dimensional structure of the placement table of the present invention;

[0021] Figure 4 For the present invention Figure 3 A schematic diagram of the partially enlarged structure at center A;

[0022] Figure 5 For the present invention Figure 3 A schematic diagram of the partially enlarged structure at B in the middle;

[0023] Figure 6 It is a schematic diagram of the top plate of the present invention when viewed from above;

[0024] Figure 7 It is a schematic diagram of the full-cut three-dimensional structure of the front side of the top plate of the present invention;

[0025] Figure 8 For the present invention Figure 7 A schematic diagram of the partially enlarged structure at C in the middle;

[0026] Fig. 9 It is a schematic diagram of the three-dimensional structure of the transfer vehicle of the present invention when viewed from above.

[0027] In the figure: 1, processing table; 2, pressure welding mechanism; 3, unloading mechanism; 4, placing table; 5, fixed frame; 6, baffle; 7, moving table; 8, transfer vehicle; 9, bottom plate; 10, reciprocating screw rod; 11, slide groove; 12, sliding block; 13, hinge plate; 14, push plate; 15, limit plate; 16, driving motor; 17, guide rod; 18, discharge port; 19, side port; 20, moving frame; 21, groove; 22, top plate; 23, moving slot; 24, sliding frame; 25, compression block; 26, upper spring; 27, connecting rod; 28, side plate; 29, moving rod; 30, horizontal slot; 31, oblique slot; 32, card slot; 33, lower spring; 34, pull rod; 35, lower frame; 36, upper frame; 37, limit block; 38, limit spring; 39, oblique block; 40, fence; 41, touch sensor; 42, alarm; 43, reset spring; 44, release plate; 45, positioning plate. DETAILED DESCRIPTION

[0028] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] like Figure 1-9 A cap welding device for lithium battery production shown in the figure comprises a processing table 1 and a welding mechanism 2 arranged on the processing table 1. The welding mechanism 2 is a mature technology in the prior art, so it is not described in detail here. The processing table 1 is provided with a feeding mechanism 3 for feeding the cap after welding. The feeding mechanism 3 is mainly composed of a feeding robot arm and a feeding hopper and other structures. A placing table 4 is provided below the discharge hopper of the feeding mechanism 3. A fixed frame 5 for storing a collection box is fixedly connected to the top of the placing table 4. A moving table 7 is provided on the side wall of the placing table 4 and away from the fixed frame 5. A transfer vehicle 8 for placing the collection box is provided on the moving table 7. After the transfer vehicle 8 moves to the moving table 7, the upper surface of the transfer vehicle 8 is flush with the upper surface of the placing table 4. The moving table 7 A moving mechanism for driving the transfer vehicle 8 to move at a fixed distance is provided on the top. A pair of bottom plates 9 are fixedly connected to the bottom of the placement table 4, and a reciprocating screw rod 10 is rotatably connected between the bottom plates 9. A slide groove 11 is provided in the middle position of the top of the placement table 4. A sliding block 12 is threadedly connected to the outer wall of the reciprocating screw rod 10, and a pair of hinge plates 13 are fixedly connected to the top of the sliding block 12. A push plate 14 is rotatably connected between the hinge plates 13, and a limit plate 15 is fixedly connected to the bottom end of the side wall of the push plate 14. A driving motor 16 is fixedly connected to the side wall of one of the bottom plates 9, and the output end of the driving motor 16 passes through the side wall of the bottom plate 9 and is fixedly connected to the side wall of the reciprocating screw rod 10. A discharge port 18 is provided at the bottom of the fixed frame 5 near the baffle 6, and the discharge port 18 facilitates the sliding out of the collection box;

[0031] In order to improve the stability of the device during operation, a guide rod 17 is fixedly connected between the base plates 9, and the guide rod 17 is arranged to penetrate the inner wall of the sliding block 12. Through the arrangement of the guide rod 17, it can play a guiding role in the process of the sliding block 12 moving when the reciprocating screw 10 rotates, thereby preventing the sliding block 12 from rotating with the reciprocating screw 10, thereby improving the stability of the device during operation.

[0032] In order to further improve the stability of the device during operation, baffles 6 are fixedly connected on both sides of the top of the placement table 4 and below the discharge hopper on the unloading mechanism 3. Through the setting of the baffle 6, the position of the pushed collection box can be restricted, which can ensure that the collection box is pushed to the specified position to prevent the collection box from falling. A side opening 19 is opened on the side of the fixed frame 5 away from the discharge port 18. The side opening 19 avoids obstruction to the normal movement of the push plate 14, and the height of the push plate 14 is higher than the top of the placement table 4. A reset spring 43 is fixedly connected between the side wall of the limit plate 15 and the top of the sliding block 12. Through the setting of the reset spring 43, it is convenient to pull the limit plate 15 to quickly reset so that the push plate 14 remains in a vertical state.

[0033] In order to automatically change the position of the collection box on the transfer vehicle 8 for the next time after the collection box is replaced, the moving mechanism includes a moving frame 20, a recessed groove 21 is provided on the top of the moving platform 7, a top plate 22 is provided inside the groove 21, a moving groove 23 is provided through the side wall of the groove 21, the moving frame 20 is slidably connected to the inside of the moving groove 23, and a pair of connecting rods 27 are fixedly connected between the moving frame 20 and the sliding block 12, a side plate 28 is fixedly connected to the side wall of the moving frame 20, a moving rod 29 is slidably connected to the top of the side plate 28, and a plurality of transverse grooves 30 are equidistantly provided at the bottom of the top plate 22, and a plurality of transverse grooves 30 are provided at a plurality of transverse grooves 30. 0, and both ends of the inclined groove 31 are connected to the ends away from the adjacent two transverse grooves 30, and a card slot 32 is provided on the inner side of the inclined groove 31 and away from the side of the placement table 4, and the top of the moving rod 29 is inserted into the inner side of one of the transverse grooves 30, and a limiting mechanism for limiting the position of the transfer vehicle 8 is provided on the top plate 22, and a positioning plate 45 is fixedly connected to the bottom of the moving rod 29, and a lower spring 33 sleeved on the outer side of the moving rod 29 is fixedly connected between the top of the positioning plate 45 and the bottom of the side plate 28, and the top of the moving rod 29 is set as a smooth arc surface, and the connection between the card slot 32 and the inclined groove 31 is inclined;

[0034] Sliding frames 24 are provided on both sides of the bottom of the top plate 22, and the sliding frames 24 are slidably connected to the inner side of the groove 21 in a transverse direction. Compression blocks 25 are fixedly connected to both sides of the bottom of the top plate 22, and the compression blocks 25 are slidably connected to the inner side of the sliding frames 24. A pair of upper springs 26 are fixedly connected between the inner side of the sliding frames 24 and the bottom of the compression blocks 25. A pull rod 34 is fixedly connected to the side wall of one of the sliding frames 24, and the pull rod 34 runs through the movable groove 23. Through the setting of the pull rod 34, it is convenient to pull the sliding frame 24 and the top plate 22 to move, and there is a distance between the last transverse groove 30 and the pull rod 34, so the pull rod 34 will not be hindered by the movable frame 20.

[0035] The upper frame 36 is fixedly connected to the lower part of the transfer cart 8 and is fixedly connected to the lower part of the transfer cart 8 at a position corresponding to the lower frame 35. The inner side of the lower frame 35 is slidably connected to a limiting block 37. The limiting block 37 is inserted into the inner side of the upper frame 36. A plurality of limiting springs 38 are fixedly connected between the inner bottom end of the lower frame 35 and the limiting block 37. The side wall of the limiting block 37 is inclined so that when the transfer cart 8 is pushed onto the top plate 22, the upper frame 36 squeezes the limiting block 37 to slide downward, so that the transfer cart 8 can be quickly moved onto the top plate 22. The side wall of the limiting block 37 is fixedly connected to a release plate 44, and the release plate 44 is arranged through the side wall of the lower frame 35.

[0036] In order to improve the practical performance of the device, both sides of the outer wall of the mobile platform 7 are fixedly connected with inclined blocks 39. Through the setting of the inclined blocks 39, it is convenient for the staff to push the transfer vehicle 8 onto the mobile platform 7, thereby improving the convenience of the device. A fence 40 is fixedly connected to the top of the mobile platform 7 and away from the side of the placement platform 4. The fence 40 can limit the position of the transfer vehicle 8 on the mobile platform 7 to improve the stability of the device. A touch sensor 41 is fixedly connected to the inner side of the transverse groove 30 away from the side of the placement platform 4, and the touch sensor 41 is arranged on the side away from the moving rod 29. The touch sensor 41 is arranged away from the moving rod 29. On one side of the top plate 22, an alarm 42 is fixedly connected to the outer wall of the moving platform 7, and the touch sensor 41 is electrically connected to the alarm 42 through the controller. Through the setting of the touch sensor 41 and the alarm 42, when the collection box on the transfer vehicle 8 is full, the moving rod 29 will move to the end of the last horizontal groove 30 under the drive of the sliding block 12. At this time, the moving rod 29 will touch the touch sensor 41, and the touch sensor 41 will transmit the signal to the controller. The controller controls the alarm 42 to be energized, and then emits an alarm sound and a warning light to remind the staff that the transfer vehicle 8 needs to be replaced, thereby improving the practical performance of the device.

[0037] Before pressure welding the lithium battery caps, the empty collection boxes are first placed in the fixed frame 5 in sequence, and the transfer vehicle 8 is pushed onto the movable platform 7, and the position of the transfer vehicle 8 is limited by the limit mechanism. Then, during the operation of the pressure welding mechanism 2, the pressure welded caps are discharged through the unloading mechanism 3 and fall into the collection box on the placement platform 4. Then, when the collection box is full, the drive motor 16 can be controlled to start (it should be noted that the drive motor 16 can be started at a fixed time by the timing controller according to the production capacity, thereby realizing the automatic replacement of the device without the need for workers to operate), and then the drive motor 16 is driven. The motor 16 drives the reciprocating screw 10 to rotate, which in turn drives the threaded sliding block 12 to move, thereby driving the push plate 14 to slide inside the slide groove 11. After that, when the push plate 14 passes the side opening 19, the limit plate 15 on the side wall of the push plate 14 abuts against the top of the sliding block 12, thereby limiting the flipping position of the push plate 14 to one side. Therefore, the push plate 14 pushes the collection box in the fixed frame 5 to move, thereby making the collection box pass through the discharge port 18. The collection box that is moved out will move to the side of the full collection box, and then the empty collection box will be pushed by the push plate 14 again. The empty collection box will push the full collection box to move on the placement table 4, thereby pushing the empty collection box under the unloading hopper on the unloading mechanism 3, and pushing the full collection box onto the transfer vehicle 8, and then the sliding block 12 moves to the end of the reciprocating screw 10, and then driven by the reciprocating screw 10, the sliding block 12 moves in the opposite direction to reset. In this process, when the empty collection box in the fixed frame 5 is removed, the collection boxes stacked above it will slide downward under gravity, and then when the push plate 14 moves to the discharge port 18, since there is no restriction on the other side of the push plate 14, The push plate 14 is then pushed out of the fixed frame 5 from under the collection box, and the limit plate 15 and the push plate 14 are pushed back and reset under the elastic force of the reset spring 43. This process is repeated to realize automatic replacement of the collection box and automatically place the full collection box on the transfer cart 8. This not only saves time and effort, but also eliminates the need for staff to be on duty at the machine for a long time. They only need to push the transfer cart 8 away at regular intervals, which greatly improves the convenience of the device.

[0038] When the drive motor 16 is running to replace the collection box, the movement of the sliding block 12 will drive the connecting rod 27, the moving frame 20 and the side plate 28 to move at the same time, thereby driving the moving rod 29 to slide inside the transverse groove 30. Then, when the push plate 14 pushes the full collection box completely onto the transfer vehicle 8, the moving rod 29 moves to the bottom of the card slot 32, and then the top of the moving rod 29 is pushed into the card slot 32 under the elastic force of the lower spring 33. Since there is a step between the card slot 32 and the transverse groove 30, and the connection between the card slot 32 and the inclined groove 31 is an inclined surface, when the reciprocating screw rod 10 drives the sliding block 12 to move back and reset, the moving rod 29 will be pulled to slide in the card slot 32 first, and then slide out of the card slot 32 and slide into the inclined groove 31, while pushing and squeezing the moving rod 29 downward and stretching the lower spring 33.

[0039] The top plate 22 is pushed upward and reset by the elastic force of the upper spring 26, and the top plate 22 is pushed upward and reset, and the moving rod 29 is made to slide out of the transverse groove 30, so that the pull rod 34 can be pulled to drive the top plate 22 and the sliding frame 24 to slide in the groove 21 for reset, and then when the empty transfer cart 8 is pushed up, the top plate 22 is squeezed to slide downward, so that the moving rod 29 is inserted into the transverse groove 30.

[0040] Before pressure welding, the staff first pushes the transfer cart 8 onto the top plate 22 through the inclined block 39. At this time, the top plate 22 and the compression block 25 are pressed downward by the gravity of the transfer cart 8 itself, so that the compression block 25 slides into the sliding frame 24 and compresses the upper spring 26. Then, when the transfer cart 8 moves to the side of the lower frame 35, the movement of the transfer cart 8 causes the upper frame 36 to squeeze the limit block 37 and slide downward, while compressing the limit spring 38. Then, when the upper frame 36 moves to a position relatively aligned with the lower frame 35, the limit block 37 is released. The limit block 37 is then pushed upward to slide into the upper frame 36 under the elastic force of the limit spring 38, thereby limiting the position of the transfer cart 8 and preventing the transfer cart 8 from moving freely on the top plate 22 during the operation of the mobile mechanism, thereby improving the stability of the device during operation. Finally, before the transfer cart 8 is filled with collection boxes and needs to be pushed out, the release plate 44 is pressed downward with the foot, thereby driving the limit block 37 to slide downward and out of the upper frame 36, and compressing the limit spring 38 at the same time, so as to push the transfer cart 8 out of the top plate 22.

[0041] The basic principles, main features and advantages of the present invention are shown and described above.

[0042] Those skilled in the art should understand that the present invention is not limited to the above-mentioned embodiments. The above-mentioned embodiments and the specification only describe the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. These changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A cap welding device for lithium battery production, comprising a processing table (1), and a welding mechanism (2) arranged on the processing table (1), wherein the processing table (1) is provided with a blanking mechanism (3) for blanking the cap after welding, characterized in that: A placement platform (4) is provided below the discharge hopper of the unloading mechanism (3); a fixed frame (5) for storing the collection box is fixedly connected to the top of the placement platform (4); a moving platform (7) is provided on the side wall of the placement platform (4) and at one end away from the fixed frame (5); a transfer vehicle (8) for placing the collection box is provided on the moving platform (7); a moving mechanism for driving the transfer vehicle (8) to move at a fixed distance is provided on the moving platform (7); a pair of bottom plates (9) are fixedly connected to the bottom of the placement platform (4); a reciprocating screw rod (10) is rotatably connected between the bottom plates (9); and a central position on the top of the placement platform (4) is provided with a A slide groove (11), the outer wall of the reciprocating screw rod (10) is threadedly connected with a sliding block (12), the top of the sliding block (12) is fixedly connected with a pair of hinge plates (13), a push plate (14) is rotatably connected between the hinge plates (13), the bottom end of the side wall of the push plate (14) is fixedly connected with a limit plate (15), one of the side walls of the bottom plate (9) is fixedly connected with a driving motor (16), the output end of the driving motor (16) passes through the side wall of the bottom plate (9) and is fixedly connected to the side wall of the reciprocating screw rod (10), and a discharge port (18) is opened at the bottom of the fixed frame (5) near the baffle (6).

2. A cap welding device for lithium battery production according to claim 1, characterized in that: A guide rod (17) is fixedly connected between the base plates (9), and the guide rod (17) is arranged to penetrate the inner wall of the sliding block (12).

3. The cap welding device for lithium battery production according to claim 1, characterized in that: Baffles (6) are fixedly connected on both sides of the top of the placement platform (4) and below the discharge hopper on the unloading mechanism (3); a side opening (19) is provided on the side of the fixed frame (5) away from the discharge port (18); the height of the push plate (14) is higher than the top of the placement platform (4); and a return spring (43) is fixedly connected between the side wall of the limit plate (15) and the top of the sliding block (12).

4. The cap welding device for lithium battery production according to claim 1, characterized in that: The moving mechanism comprises a moving frame (20), a recessed groove (21) is provided on the top of the moving platform (7), a top plate (22) is provided inside the groove (21), a moving groove (23) is provided through the side wall of the groove (21), the moving frame (20) is slidably connected to the inside of the moving groove (23), a pair of connecting rods (27) are fixedly connected between the moving frame (20) and the sliding block (12), a side plate (28) is fixedly connected to the side wall of the moving frame (20), and a sliding connecting rod (27) is provided through the top of the side plate (28). A moving rod (29) is connected, a plurality of transverse grooves (30) are equidistantly provided at the bottom of the top plate (22), an inclined groove (31) is provided between the plurality of transverse grooves (30), and both ends of the inclined groove (31) are connected to the ends of two adjacent transverse grooves (30) that are away from each other, a clamping groove (32) is provided on the inner side of the inclined groove (31) and away from the placement platform (4), and the top end of the moving rod (29) is plugged into the inner side of one of the transverse grooves (30), and a limiting mechanism for limiting the position of the transfer vehicle (8) is provided on the top plate (22).

5. A cap welding device for lithium battery production according to claim 4, characterized in that: Sliding frames (24) are provided on both sides of the bottom of the top plate (22), and the sliding frames (24) are laterally slidably connected to the inner side of the groove (21); compression blocks (25) are fixedly connected to both sides of the bottom of the top plate (22), and the compression blocks (25) are slidably connected to the inner side of the sliding frame (24); a pair of upper springs (26) are fixedly connected between the inner side of the sliding frame (24) and the bottom of the compression block (25); a pull rod (34) is fixedly connected to one of the side walls of the sliding frame (24), and the pull rod (34) passes through the movable groove (23).

6. A cap welding device for lithium battery production according to claim 4, characterized in that: The bottom of the moving rod (29) is fixedly connected to a positioning plate (45), and a lower spring (33) sleeved on the outside of the moving rod (29) is fixedly connected between the top of the positioning plate (45) and the bottom of the side plate (28). The top of the moving rod (29) is set to a smooth arc surface, and the connection between the clamping groove (32) and the inclined groove (31) is inclined.

7. A cap welding device for lithium battery production according to claim 4, characterized in that: The limiting mechanism comprises a lower frame (35), the lower frame (35) is fixedly connected to the middle position of the top end of the top plate (22), and an upper frame (36) is fixedly connected to the bottom of the transfer vehicle (8) and at a position corresponding to the lower frame (35), a limiting block (37) is slidably connected to the inner side of the lower frame (35), the limiting block (37) is plugged into the inner side of the upper frame (36), and a plurality of limiting springs (38) are fixedly connected between the inner bottom end of the lower frame (35) and the limiting block (37), and the side wall of the limiting block (37) is inclined, and a release plate (44) is fixedly connected to the side wall of the limiting block (37), and the release plate (44) is arranged to penetrate the side wall of the lower frame (35).

8. The cap welding device for lithium battery production according to claim 4, characterized in that: Both sides of the outer wall of the movable platform (7) are fixedly connected with inclined blocks (39), and a fence (40) is fixedly connected to the top of the movable platform (7) and the side away from the placement platform (4), and a touch sensor (41) is fixedly connected through the inner side of the transverse groove (30) away from the side of the placement platform (4), and the touch sensor (41) is arranged on the side away from the movable rod (29), and the touch sensor (41) is arranged on the side away from the top plate (22). An alarm (42) is fixedly connected to the outer wall of the movable platform (7), and the touch sensor (41) is electrically connected to the alarm (42) through a controller.

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