Lithium battery cap pressure welding device and welding method

Abstract

The invention discloses a lithium battery cap pressure welding device and a welding method, and relates to the technical field of lithium battery cap welding. The lithium battery cap pressure welding device comprises a machine body, a fixing frame is installed on the machine body, a telescopic rod is fixedly connected to the fixing frame, a supporting column is further fixedly connected to the machine body, and a rotating disc is rotationally connected to the end of the supporting column; the welding device further comprises two sets of connecting assemblies installed on the rotating disc, welding guns are connected to the connecting assemblies, conductive structures are arranged at the ends of the welding guns, and the two sets of connecting assemblies are used for connecting the two sets of welding guns. According to the welding machine, the two sets of welding guns are arranged, so that the positions of the two sets of welding guns are switched, the good welding guns are rotated to the working positions, the damaged welding guns are rotated to the non-working positions, at the moment, the damaged welding guns are conveniently maintained, the shutdown time is extremely short in the process, and work of a welding line is not affected.

Description

Technical Field

[0001] This invention relates to the field of lithium battery cap welding technology, specifically to a lithium battery cap pressure welding device and welding method. Background Technology

[0002] The lithium battery cap is a key component used for battery sealing. It mainly serves as a positive electrode conductor, a safety valve, and an encapsulation function. Its structure includes a top cover plate, terminals, explosion-proof devices (such as explosion-proof plates and flip plates), and sealing components. The components are connected by laser welding to ensure airtightness. It integrates a CID current disconnect device and a pressure relief valve. When the internal pressure or temperature of the battery is abnormal, it achieves overpressure protection by cutting off the current and venting pressure.

[0003] Currently, cap welding of lithium batteries is a critical process in battery assembly. It primarily uses spot welding or laser welding to seal the battery cap to the aluminum casing, simultaneously achieving conductivity and pressure relief. In existing technologies, the cap welding process for lithium batteries is generally automated, with the cap and aluminum casing automatically transported to the welding position. During this process, the welding torch needs to be constantly running to avoid affecting the cap welding. However, due to the prolonged high temperature during welding, the welding torch is prone to malfunction or damage, requiring shutdown for repair. This halts the welding production line, significantly impacting welding efficiency. Therefore, we propose a cap welding device and welding method for lithium batteries. Summary of the Invention

[0004] The purpose of this invention is to provide a lithium battery cap pressure welding apparatus and welding method to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a lithium battery cap pressure welding device, comprising a body, a fixed frame mounted on the body, a telescopic rod fixedly connected to the fixed frame, and a support column fixedly connected to the body, the end of the support column being rotatably connected to a rotating disk; further comprising: two sets of connecting components mounted on the rotating disk, each connecting component being connected to a welding torch, the end of the welding torch being provided with a conductive structure, the two sets of connecting components being used to connect two sets of welding torches; a fixing component, comprising two sets of fixing components respectively connected to the two sets of connecting components, the fixing component being used to fix the welding torches on the connecting components; and a rotating component, the rotating component being installed inside the body and connected to the rotating disk, the rotating component being used to drive the rotating disk to rotate, thereby switching the two sets of welding torches through the rotation of the rotating disk, and thus allowing the faulty welding torch to be rotated to a non-working area for repair, achieving maintenance without stopping the machine.

[0006] Preferably, the connecting assembly includes two sets of sliding plates slidably connected to the rotating disks. The two sets of sliding plates are symmetrically arranged, and one set of sliding plates is located directly below the telescopic rod. A hollow column is fixedly connected to the end of each sliding plate, and a groove is formed on the hollow column. A connecting plate is fixedly connected to the bottom of each sliding plate, and a sliding rod that is slidably connected to the rotating disk is fixedly connected to the connecting plate. The welding torch passes through the connecting plate and the sliding plate. An elastic element is installed on the outer side of the sliding rod to facilitate the connection of two sets of welding torches in the equipment. After the two sets of welding torches are connected, they can be quickly disassembled and installed, which is convenient for maintenance and replacement.

[0007] Preferably, the fixing component includes a collar sleeved on the outer side of the welding torch, a fixing bolt threaded onto the collar, and multiple support blocks installed at the bottom end of the collar. A rotating column that is rotatably connected to the connecting plate is fixedly connected to the support block. A linkage component is provided between the multiple sets of rotating columns to drive the multiple sets of rotating columns to rotate synchronously, which facilitates the stable fixing of the welding torch in the device and enables the welding torch to be quickly disassembled, thereby improving the installation efficiency.

[0008] Preferably, the linkage includes a flat gear fixedly connected to multiple sets of rotating columns, the outer side of the flat gear meshing with a gear belt, a limiting piece fixedly connected to the bottom end of the flat gear, the limiting piece being used to limit the gear belt, and a reset component installed on the outer side of the rotating column to achieve quick assembly and disassembly, thereby improving work efficiency.

[0009] Preferably, the reset component includes a connecting piece fixedly connected to the rotating column, a torsion spring fixedly connected to the connecting piece, and a fixing piece fixedly connected to the end of the torsion spring and the connecting plate, so as to facilitate the quick reset of the support block to support and fix the welding gun.

[0010] Preferably, the rotating assembly includes a motor fixed inside the machine body, and the output end of the motor is fixedly connected to a drive shaft that passes through the machine body and the support column. The drive shaft is rotatably connected to the machine body and the support column, and the end of the drive shaft is fixedly connected to the rotating disk. A limiting component is also installed on the outer side of the drive shaft to facilitate the rotation of the rotating disk, thereby realizing the switching of the two sets of welding torches.

[0011] Preferably, the limiting component includes a fixing block sleeved on the outer side of the drive shaft, the fixing block being fixedly connected to the rotating disk and rotatably connected to the supported column, a first spring being fixedly connected inside the fixing block, a sliding block being fixedly connected to the end of the first spring and slidably connected to the fixing block, a ball being provided at the end of the sliding block, and a groove adapted to the ball being provided on the supported column, the groove being provided in two sets and the position corresponding to the position of the two sets of welding guns, thereby limiting the position of the welding gun and improving the stability of the welding gun.

[0012] Preferably, the conductive structure includes a conductive base fixed on the rotating disk, with a connecting wire connected to the end of the conductive base, and two sets of plugs inserted into the conductive base. The plugs are connected with wires, and the two sets of wires are electrically connected to the two sets of welding guns respectively, which facilitates the wiring and conduction of the welding guns, thereby enabling the welding guns to operate normally.

[0013] Preferably, the elastic element includes a connecting ring fixedly connected to the sliding rod, a second spring fixedly connected to the connecting ring and sleeved on the outer side of the sliding rod, and a fixing ring fixedly connected to the end of the second spring and fixedly connected to the rotating disk. The fixing ring is slidably connected to the sliding rod to facilitate the reset of the sliding plate.

[0014] The lithium battery cap welding method includes the following steps: S1: Cap Positioning: Place the lithium battery cap (electrolyte injection port) into the pressure welding through hole of the pressure welding device, ensuring that the position is aligned.

[0015] S2: Intermittent rotation: The servo motor drives the turntable on the machine body to rotate intermittently, and the movement of the cap is controlled by the limit mechanism.

[0016] S3: Pressure welding operation: The telescopic rod is activated to drive the welding gun to press down. The welding gun moves down so that the welding head of the welding gun welds the cap to form a firm weld point.

[0017] S4: Material collection: After welding is completed, the turntable rotates to the V-shaped material collection notch, and the cap falls into the collection box.

[0018] Compared with the prior art, the beneficial effects of the present invention are: The lithium battery cap pressure welding device and welding method provided by this invention, by setting up a fixing component and a rotating component, allows the rotating component to rotate the rotating disk during the welding process if the welding gun is damaged or malfunctions, thereby switching the positions of the two sets of welding guns. This allows the good welding gun to be rotated to the working position, and the damaged welding gun to the non-working position, which facilitates maintenance of the damaged welding gun. The downtime during this process is extremely short and does not affect the operation of the welding line. In addition, the fixing component enables the rapid disassembly and assembly of the welding gun, further improving efficiency. This solves the problem of reduced welding efficiency caused by the need to stop the machine for maintenance after the welding gun is damaged in the prior art. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of the present invention; Figure 3 This is a partial structural diagram of the present invention; Figure 4 This is a schematic diagram of the connection structure between the welding gun and the connecting assembly of the present invention; Figure 5 This is a schematic diagram of the connection structure between a single welding torch and the connecting assembly of the present invention; Figure 6 This is a schematic diagram of the fixed component structure of the present invention; Figure 7 This is a schematic diagram of the fixed component of the present invention from another perspective; Figure 8 For the present invention Figure 7 Schematic diagram of the structure of area A in the middle; Figure 9 This is a schematic diagram of the rotating component structure of the present invention; Figure 10 This is a schematic diagram of the limiting component structure of the present invention; Figure 11 For the present invention Figure 10 Schematic diagram of the structure of area B in the middle.

[0020] In the diagram: 1. Body; 2. Fixing frame; 3. Telescopic rod; 4. Support column; 5. Rotating disk; 6. Connecting assembly; 7. Welding torch; 8. Conductive structure; 9. Fixing assembly; 10. Rotating assembly; 11. Sliding plate; 12. Hollow column; 13. Wire groove; 14. Sliding rod; 15. Connecting plate; 16. Collar; 17. Fixing bolt; 18. Support block; 19. Rotating column; 20. Linkage component; 21. Flat gear; 22. Gear belt; 23. Reset component; 24. Limiting plate; 25. Connecting plate; 26. Torsion spring; 27. Fixing plate; 28. Motor; 29. ​​Drive shaft; 30. Limiting component; 31. Fixing block; 32. First spring; 33. Sliding block; 34. Ball bearing; 35. Groove; 36. Conductive seat; 37. Connecting wire; 38. Plug; 39. Wire; 40. Fixing ring; 41. Second spring; 42. Connecting ring. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0022] Please see Figures 1-11 This invention provides a technical solution: a lithium battery cap pressure welding device, comprising a body 1, a fixed frame 2 mounted on the body 1, a telescopic rod 3 fixedly connected to the fixed frame 2, and a support column 4 fixedly connected to the body 1, with a rotating disk 5 rotatably connected to the end of the support column 4; further comprising: two sets of connecting components 6 mounted on the rotating disk 5, each connecting component 6 connected to a welding torch 7, the end of the welding torch 7 having a conductive structure 8, the two sets of connecting components 6 being used to connect two sets of welding torches 7; two sets of fixing components 9, each set being connected to one of the two sets of connecting components 6, the fixing components 9 being used to fix the welding torches 7 to the connecting components 6; and a rotating component 10, the rotating component 10 being installed inside the body 1 and connected to the rotating disk 5, the rotating component 10 being used to drive the rotating disk 5 to rotate, thereby switching between the two sets of welding torches 7 through the rotation of the rotating disk 5, and thus allowing a faulty welding torch 7 to be rotated to a non-working area for repair, achieving maintenance without stopping the machine.

[0023] The lithium battery cap welding method includes the following steps: S1: Cap Positioning: Place the lithium battery cap (electrolyte injection port) into the pressure welding through hole of the pressure welding device, ensuring alignment; S2: Intermittent rotation: The servo motor drives the turntable on the machine body to rotate intermittently, and the movement of the cap is controlled by the limit mechanism; S3: Pressure welding operation: The telescopic rod is activated, causing the welding torch to press down. The downward movement of the welding torch allows the welding head of the torch to weld onto the cap, forming a strong weld point; S4: Material collection: After welding is completed, the turntable rotates to the V-shaped material collection notch, and the cap falls into the collection box.

[0024] During the welding process, if the welding torch 7 is damaged or malfunctions, the rotating component 10 rotates the rotating disk 5, thereby switching the positions of the two sets of welding torches 7. The good welding torch 7 is rotated to the working position, and the damaged welding torch 7 is rotated to the non-working position. This facilitates the maintenance of the damaged welding torch 7, and the downtime during this process is extremely short, which does not affect the operation of the welding line. In addition, the fixing component 9 enables the rapid disassembly and assembly of the welding torch 7, further improving efficiency.

[0025] In an embodiment of the present invention, please refer to Figures 3-5 The connecting component 6 shown in the figure includes two sets of sliding plates 11 that are slidably connected to the rotating disks 5. The two sets of sliding plates 11 are symmetrically arranged, and one set of sliding plates 11 is located directly below the telescopic rod 3. A hollow column 12 is fixedly connected to the end of the sliding plate 11. A wire groove 13 is opened on the hollow column 12. A connecting plate 15 is fixedly connected to the bottom of the sliding plate 11. A sliding rod 14 that is slidably connected to the rotating disk 5 is fixedly connected to the connecting plate 15. The welding torch 7 is arranged through the connecting plate 15 and the sliding plate 11. An elastic element is installed on the outer side of the sliding rod 14 to facilitate the connection of the two sets of welding torches 7 in the equipment. After the two sets of welding torches 7 are connected, they can be quickly disassembled and installed, which is convenient for maintenance and replacement.

[0026] The elastic element includes a connecting ring 42 fixedly connected to the sliding rod 14. A second spring 41 is fixedly connected to the connecting ring 42 and sleeved on the outer side of the sliding rod 14. A fixing ring 40 fixedly connected to the end of the second spring 41 and fixedly connected to the rotating disk 5 is fixedly connected to the end of the second spring 41. The fixing ring 40 is slidably connected to the sliding rod 14 to facilitate the reset of the sliding plate 11.

[0027] Furthermore, during welding, the telescopic rod 3 moves downward, causing the hollow column 12 to move downward. The downward movement of the hollow column 12 causes the welding torch 7 and the sliding plate 11 to move downward. The welding torch 7 is used to weld the cap. During this process, the second spring 41 is gradually compressed. When the telescopic rod 3 retracts, the sliding plate 11 and the welding torch 7 move upward and reset due to the action of the second spring 41. There is no direct connection between the end of the telescopic rod 3 and the hollow column 12. Therefore, when the rotating disk 5 rotates, the telescopic rod 3 will not obstruct its rotation.

[0028] In an embodiment of the present invention, please refer to Figures 6-8The fixing component 9 shown in the figure includes a collar 16 sleeved on the outer side of the welding torch 7. A fixing bolt 17 is threaded onto the collar 16. Multiple support blocks 18 are installed at the bottom of the collar 16. Rotating columns 19 that are rotatably connected to the connecting plate 15 are fixedly connected to the support blocks 18. A linkage 20 is provided between the multiple sets of rotating columns 19 to drive the multiple sets of rotating columns 19 to rotate synchronously, which facilitates the stable fixing of the welding torch 7 in the device and enables the welding torch 7 to be quickly disassembled, thereby improving the installation efficiency.

[0029] The collar 16 is fixed to the outer side of the welding torch 7 by the fixing bolt 17, and the support block 18 supports the collar 16, so that the welding torch 7 will not fall off, thus achieving the fixation of the welding torch 7.

[0030] In an embodiment of the present invention, please refer to Figure 7 and Figure 8 The linkage 20 shown in the figure includes a flat gear 21 fixedly connected to multiple sets of rotating columns 19. The outer side of the flat gear 21 is meshed with a gear belt 22. The bottom end of the flat gear 21 is fixedly connected to a limiting piece 24, which is used to limit the gear belt 22. The outer side of the rotating column 19 is also equipped with a reset piece 23 to realize the function of quick disassembly and assembly, thereby improving work efficiency.

[0031] The reset component 23 includes a connecting piece 25 fixedly connected to the rotating column 19. A torsion spring 26 is fixedly connected to the connecting piece 25. The end of the torsion spring 26 is fixedly connected to a fixing piece 27 fixedly connected to the connecting plate 15, so as to facilitate the quick reset of the support block 18 to support and fix the welding gun 7.

[0032] Furthermore, during disassembly, the support block 18 is pried outward to rotate the rotating column 19. At this time, the multiple sets of rotating columns 19 rotate synchronously through the transmission action of multiple sets of flat gears 21 and gear belts 22, thereby causing multiple sets of support blocks 18 to move away from the welding torch 7 synchronously. As a result, the support blocks 18 can no longer support the collar 16. At this time, the welding torch 7 loses the limiting effect of the support blocks 18, which makes it easier to disassemble it.

[0033] After the welding torch 7 is disassembled, the new welding torch 7 is installed on the sliding plate 11. Then the support block 18 is released. At this time, the rotating column 19 drives the support block 18 to reset through the action of the torsion spring 26. At this time, the support block 18 limits the collar 16 again, and multiple sets of support blocks 18 squeeze and fix the welding torch 7, thereby completing the fixation of the welding torch 7.

[0034] In an embodiment of the present invention, please refer to Figure 9 and Figure 10The rotating assembly 10 shown in the figure includes a motor 28 fixed inside the body 1. The output end of the motor 28 is fixedly connected to a drive shaft 29 that passes through the body 1 and the support column 4. The drive shaft 29 is rotatably connected to the body 1 and the support column 4, and the end of the drive shaft 29 is fixedly connected to the rotating disk 5. A limiter 30 is also installed on the outer side of the drive shaft 29 to facilitate the rotation of the rotating disk 5, thereby realizing the switching of the two sets of welding torches 7.

[0035] The limiting component 30 includes a fixing block 31 sleeved on the outer side of the drive shaft 29. The fixing block 31 is fixedly connected to the rotating disk 5 and rotatably connected to the supported column 4. A first spring 32 is fixedly connected inside the fixing block 31. A sliding block 33 that is slidably connected to the fixing block 31 is fixedly connected to the end of the first spring 32. A ball 34 is provided at the end of the sliding block 33. A groove 35 that is adapted to the ball 34 is provided on the supported column 4. Two sets of grooves 35 are provided and their positions correspond to the positions of the two sets of welding torches 7, thereby limiting the position of the welding torches 7 and improving the stability of the welding torches 7.

[0036] In this process, the starting of motor 28 will cause drive shaft 29 to drive rotating disk 5 to rotate. The rotation of rotating disk 5 will cause two sets of welding torches 7 to rotate, realizing the switching of the two sets of welding torches 7. During this process, the rotating disk 5 is limited by the action of ball bearing 34, groove 35 and first spring 32, so that rotating disk 5 is more stable. Without the application of external force, rotating disk 5 will not rotate, thus keeping welding torch 7 in a stable state.

[0037] In an embodiment of the present invention, please refer to Figures 2-4 The conductive structure 8 shown in the figure includes a conductive base 36 fixed on the rotating disk 5. The end of the conductive base 36 is connected to a connecting wire 37, and two sets of plugs 38 are inserted into the conductive base 36. Wires 39 are connected to the plugs 38. The two sets of wires 39 are electrically connected to the two sets of welding guns 7 respectively, which facilitates the wiring and conduction of the welding guns 7, thereby enabling the welding guns 7 to operate normally.

[0038] The wire 39 passes through the wire groove 13 and inserts the plug 38 into the conductive base 36.

[0039] Working principle: During welding, the telescopic rod 3 is activated, causing its end to extend. The telescopic rod 3 then moves the hollow column 12 downward, which in turn moves the sliding plate 11 and the connecting plate 15 downward, thereby moving the welding torch 7 downward. The welding torch 7 then welds the cap. During this process, the second spring 41 is compressed. After welding, the telescopic rod 3 retracts. The reset action of the second spring 41 causes the sliding rod 14 to move the connecting plate 15 and the sliding plate 11 upward to reset, which in turn moves the welding torch 7 upward to reset, facilitating the welding of the next set of caps. In the event that the welding torch 7 is damaged or malfunctioning, the machine body 1 will stop running and the control motor 28 will start. After the motor 28 starts, it will drive the drive shaft 29 to rotate. The rotation of the drive shaft 29 will drive the rotating disk 5 to rotate. The rotation of the rotating disk 5 will drive the two sets of welding torches 7 to rotate, thereby rotating the good welding torch 7 to the welding position, while the previously damaged or malfunctioning welding torch 7 will be switched to the non-welding position. At this time, the machine body 1 will start again to weld the cap. This process takes a short time and basically does not affect the welding of the cap. Afterwards, the welding torch 7 can be repaired or replaced. Furthermore, during maintenance or replacement, pull the support block 18 outward to move it away from the welding torch 7. At this time, the rotation of the support block 18 causes the rotating column 19 to rotate, which in turn drives the spur gear 21 to rotate. Due to the action of the gear belt 22, the other spur gears 21 rotate synchronously, which in turn causes multiple sets of rotating columns 19 to rotate synchronously. Therefore, all sets of support blocks 18 will move away from the welding torch 7 at the same time, and the collar 16 will lose the limit of the support block 18. At this time, unplug the plug 38 and the welding torch 7 can be removed for maintenance or direct replacement. During the installation of the welding torch 7, the support block 18 is pulled again. At this time, all the support blocks 18 will still rotate outward, which will not affect the installation of the welding torch 7. After the welding torch 7 is installed, the support block 18 is loosened. At this time, the torsion spring 26 will cause the rotating column 19 to drive the support block 18 to return to its original position. The return of the support block 18 will compress and fix the welding torch 7. The support block 18 is located at the bottom of the collar 16, thus limiting the collar 16. The collar 16 is fixed to the welding torch 7 by the fixing bolt 17. Thus, the support block 18 can limit the welding torch 7 and prevent it from falling. Then, the wire 39 and the plug 38 are passed through the wire groove 13. Then, the plug 38 is inserted into the conductive base 36. At this time, the welding torch 7 is powered on and can be used normally.

[0040] It should be noted that during the operation, the two sets of welding torches 7 do not need to be in operation all the time. After one set of welding torches 7 has been working for a period of time, even if the welding torch 7 has not malfunctioned, the motor 28 can be started to switch the two sets of welding torches 7, so as to avoid the same set of welding torches 7 working for a long time and affecting its service life. It is worth noting that the motor 28 in this solution is a forward and reverse motor 28. During the switching between the two sets of welding torches 7, the motor 28 will run in both forward and reverse directions, that is, after turning forward, it will turn in reverse, and then turn forward again, and so on, to avoid the connection wire 37 being damaged due to rotating in the same direction.

[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lithium battery cap crimping device, characterized by, The utility model relates to a welding gun quick switching device, including: The body (1) is installed with the fixing frame (2), the fixing frame (2) is fixedly connected with the telescopic link (3), and the body (1) is also fixedly connected with the support column (4), and the end of the support column (4) is rotatably connected with the rotary disc (5); Also including: Two groups of connecting assemblies (6) are installed on the rotary disc (5), the connecting assembly (6) is connected with the welding torch (7), the end of the welding torch (7) is provided with the electrically conductive structure (8), and two groups of the connecting assembly (6) are used to connect two groups of the welding torch (7); The fixing assembly (9) is provided with two groups and is connected with two groups of the connecting assembly (6) respectively, and the fixing assembly (9) is used to fix the welding torch (7) on the connecting assembly (6); The rotary assembly (10) is installed in the body (1) and is connected with the rotary disc (5), the rotary assembly (10) is used to drive the rotary disc (5) to rotate, the switching of two groups of the welding torch (7) is realized through the rotation of the rotary disc (5), and then the welding torch (7) with fault can be switched to the non-working area for maintenance, realizing the maintenance without stopping.

2. The lithium battery cap press bonding apparatus of claim 1, wherein: The connecting assembly (6) includes two groups of the rotary disc (5) slidingly connected sliding plate (11), two groups of the sliding plate (11) are symmetrically arranged, and one group of the sliding plate (11) is arranged at the position directly below the telescopic link (3), the end of the sliding plate (11) is fixedly connected with the hollow column (12), the hollow column (12) is provided with the wire slot (13), and the bottom of the sliding plate (11) is fixedly connected with the connecting plate (15), the connecting plate (15) is fixedly connected with the sliding rod (14) slidably connected with the rotary disc (5), and the welding torch (7) penetrates the connecting plate (15) and the sliding plate (11) and is arranged, and the outer side of the sliding rod (14) is provided with an elastic member.

3. The lithium battery capping press-bonding apparatus of claim 2, wherein: The fixing assembly (9) includes the sleeve ring (16) sleeved on the outer side of the welding torch (7), the sleeve ring (16) is threadedly connected with the fixing bolt (17), a plurality of support blocks (18) are installed at the bottom position of the sleeve ring (16), the support block (18) is fixedly connected with the rotating column (19) rotatably connected with the connecting plate (15), and a plurality of the rotating column (19) is provided with the linkage (20) for driving a plurality of the rotating column (19) to rotate synchronously.

4. The lithium battery capping press-bonding apparatus of claim 3, wherein: The linkage (20) includes the flat gear (21) fixedly connected with a plurality of the rotating column (19) respectively, the outer side of the flat gear (21) is engaged with the gear belt (22) in transmission, the bottom of the flat gear (21) is fixedly connected with the limiting sheet (24), the limiting sheet (24) is used for limiting the gear belt (22), and the outer side of the rotating column (19) is also provided with the reset member (23).

5. The lithium battery cap press bonding apparatus of claim 4, wherein: The reset member (23) comprises a connecting sheet (25) fixedly connected with the rotating column (19), a torsion spring (26) is fixedly connected on the connecting sheet (25), and the end of the torsion spring (26) is fixedly connected with a fixed sheet (27) fixedly connected with the connecting plate (15).

6. The lithium battery capping press-bonding apparatus of claim 5, wherein: The rotating assembly (10) comprises a motor (28) fixed in the body (1), the output end of the motor (28) is fixedly connected with a driving shaft (29) penetrating through the body (1) and the supporting column (4), the driving shaft (29) is rotatably connected with the body (1) and the supporting column (4), and the end of the driving shaft (29) is fixedly connected with the rotating disc (5), and the outer side of the driving shaft (29) is further provided with a limiting member (30).

7. The lithium battery capping press-bonding apparatus of claim 6, wherein: The limiting member (30) comprises a fixed block (31) sleeved on the outer side of the driving shaft (29), the fixed block (31) is fixedly connected with the rotating disc (5) and rotatably connected with the supporting column (4), the first spring (32) is fixedly connected in the fixed block (31), the end of the first spring (32) is fixedly connected with a sliding block (33) slidably connected with the fixed block (31), the end of the sliding block (33) is provided with a ball (34), the supporting column (4) is provided with a rolling groove (35) matched with the ball (34), and the rolling groove (35) is provided with two groups and the positions correspond to the positions of the two groups of welding guns (7).

8. The lithium battery capping press-bonding apparatus of claim 7, wherein: The conductive structure (8) comprises a conductive seat (36) fixed on the rotating disc (5), the end of the conductive seat (36) is connected with a connecting wire (37), two groups of plugs (38) are inserted into the conductive seat (36), the conductive seat (36) is connected with a conductive wire (39), and the two groups of conductive wires (39) are electrically connected with the two groups of welding guns (7).

9. The lithium battery capping press-bonding apparatus of claim 8, wherein: The elastic member comprises a connecting ring (42) fixedly connected with the sliding rod (14), the second spring (41) is fixedly connected on the connecting ring (42) and sleeved on the outer side of the sliding rod (14), the end of the second spring (41) is fixedly connected with a fixed ring (40) fixedly connected with the rotating disc (5), and the fixed ring (40) is slidably connected with the sliding rod (14).

10. The lithium battery cap welding method according to any one of claims 1-9, wherein, The method comprises the following steps: S1: cap positioning: place the lithium battery cap (electrolyte injection port) in the pressure welding through hole of the pressure welding device to ensure alignment; S2: intermittent rotation: the servo motor drives the rotating disc on the body to rotate intermittently, and the movement of the cap is controlled by the limiting mechanism; S3: pressure welding operation: the telescopic rod is started to drive the welding gun to move downward, the welding head of the welding gun moves downward to weld the cap to form a firm welding point; S4: blank collection: after welding, the rotating disc is rotated to the V-shaped blank gap, and the cap falls into the collection box.

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