A lithium battery liquid injection pin soldering device

Abstract

The present application relates to the technical field of lithium battery welding, in particular to a lithium battery liquid injection pin welding device, a rack unit, comprising a fixed base and a lifting driving mechanism connected with the fixed base; a conveying unit, comprising a conveying turntable rotatably arranged above the fixed base, a plurality of embedded conveying grooves for containing lithium batteries to be processed are uniformly arranged on the conveying turntable in the circumferential direction. The present application locally and quickly inductively heats the surface of the liquid injection pin inside the insulating sleeve through the inductive heating coil arranged on the insulating sleeve, the residual electrolyte attached to the periphery of the liquid injection pin is evaporated by heating, the traditional mechanical wiping is replaced by the non-contact inductive heating, the residual electrolyte is evaporated and removed in advance, the welding defects such as spatter, pores and burst points caused by the violent boiling of electrolyte due to high temperature during subsequent laser welding are effectively avoided, and the qualified rate of laser welding and the sealing quality of the weld are improved.

Description

Technical Field

[0001] This invention relates to the field of lithium battery welding technology, and in particular to a lithium battery liquid injection pin welding device. Background Technology

[0002] In the modern manufacturing process of lithium batteries, the electrolyte injection process is one of the core steps that determines the battery's electrochemical performance and safety. Typically, the electrolyte is injected into the battery through an injection hole pre-installed on the battery casing. After injection, to completely isolate the battery's internal environment from the outside air and prevent electrolyte leakage and evaporation, as well as external moisture intrusion, the industry commonly uses metal injection pins to initially physically seal the injection hole. Then, an intelligent welding system is used to melt-weld the joint between the pin and the edge of the injection hole, achieving a permanent hermetically sealed battery casing. Intelligent welding systems generally achieve high-precision welding through automated conveying, precise positioning, and the coordinated operation of efficient heat sources, significantly improving weld quality, production efficiency, and processing consistency. Currently, intelligent welding systems mainly employ resistance welding, arc welding, ultrasonic welding, and laser welding. Among these, high-energy laser welding technology, as the most cutting-edge core technology of intelligent welding systems, is widely used in the lithium battery packaging field due to its high energy density and precise heat input.

[0003] However, in the existing laser welding process for liquid-filled pins, due to the special nature of the liquid-filling operation, a small amount of electrolyte often remains in the tiny assembly gap between the pin and the housing after the pin is inserted into the liquid-filling hole. When a high-energy-density laser beam irradiates the pin gap containing residual electrolyte, the extremely high heat input causes these liquid residues to boil instantly and vaporize violently. This rapidly expanding gas, generated by the sudden increase in local high temperature, violently pushes open the molten metal pool that has not yet solidified from the depth of the gap, causing molten aluminum and other metal materials to splash. These areas broken by the gas will leave obvious pores or burst defects at the weld, directly destroying the continuity of the weld and the overall sealing of the battery, causing the finished battery to leak and fail the test in subsequent inspection processes. Summary of the Invention

[0004] In view of this, the purpose of this invention is to provide a lithium battery electrolyte injection pin welding device to solve the problem that when existing lithium battery electrolyte injection pins are laser welded, residual electrolyte vaporizes due to heat, causing metal splashing and pore defects, thereby damaging the battery seal and affecting battery quality.

[0005] To achieve the above objectives, the present invention provides a lithium battery electrolyte injection pin welding device, comprising:

[0006] The frame unit includes a fixed base and a lifting drive mechanism connected to the fixed base;

[0007] The conveying unit includes a conveying turntable rotatably mounted above the fixed base, and the conveying turntable has a plurality of fitting conveying slots evenly arranged along the circumference for holding lithium batteries to be processed.

[0008] The processing station unit is arranged around the top of the conveyor turntable. The processing station unit has a loading position, a pre-cleaning processing position, a pre-grinding processing position, a laser welding processing position and a unloading position arranged in sequence along the rotation path of the conveyor turntable. The conveyor turntable is used to drive the lithium battery to circulate through each processing position in sequence.

[0009] A pre-cleaning mechanism is provided at the pre-cleaning processing position. The pre-cleaning mechanism includes an insulating sleeve, which is connected to a lifting drive mechanism to drive the insulating sleeve to reciprocate in the vertical direction. An induction heating coil is arranged around the outer wall of the insulating sleeve, and a heating fitting port is provided at the bottom end of the insulating sleeve.

[0010] A laser welding mechanism is disposed at the laser welding processing position;

[0011] When the lithium battery moves to the pre-cleaning processing position, the lifting drive mechanism drives the insulating sleeve to descend, so that the heating fitting port is nested on the outside of the lithium battery liquid injection pin, and the liquid injection pin is locally induction heated by the induction heating coil to evaporate the residual electrolyte around the liquid injection pin.

[0012] Furthermore, the pre-cleaning mechanism also includes a heated fixing sleeve;

[0013] The heating fixing sleeve is connected to the lifting drive mechanism, and the insulating sleeve is nested and slidably disposed at the bottom end of the heating fixing sleeve;

[0014] The buffer spring is sleeved on the outside of the heating fixed sleeve and abuts between the heating fixed sleeve and the insulating sleeve. When the lifting drive mechanism moves the heating fixed sleeve, it simultaneously moves the insulating sleeve up and down.

[0015] Furthermore, the laser welding mechanism includes a fixed support frame, a laser scanning galvanometer, a laser generator, and a protective sleeve;

[0016] The fixed support frame is fixedly connected to the fixed base, and a laser scanning galvanometer is provided in the middle of the fixed support frame. The laser generator is located on the outside of the laser scanning galvanometer.

[0017] The protective sleeve is located below the fixed support frame and is vertically slidably connected to the fixed support frame. The protective sleeve is also connected to the lifting drive mechanism.

[0018] The inner side of the protective sleeve is provided with an anti-scattering shield, and the inner side of the anti-scattering shield is uniformly surrounded by multiple V-shaped extinction refraction plates.

[0019] Furthermore, the pre-grinding processing position is provided with a pre-grinding mechanism, which includes a central support tube connected to the lifting drive mechanism;

[0020] A main rotating sleeve is rotatably connected to the lower part of the central support tube, and an annular grinding head is nested and connected to the inner side of the main rotating sleeve.

[0021] The bottom of the main rotating sleeve is provided with an isolation bearing, and a bottom sealing collar is connected below the isolation bearing. The bottom sealing collar is rotatably connected to the main rotating sleeve through the isolation bearing.

[0022] A synchronous pulley is coaxially nested on the outer side of the top of the main rotating sleeve. A grinding drive motor is fixedly connected to the outer side of the central support tube. A drive pulley is provided on the shaft end of the grinding drive motor. The drive pulley and the synchronous pulley are connected by a transmission belt to drive the main rotating sleeve to rotate the annular grinding head.

[0023] Furthermore, a grinding guide rod is connected vertically to the top of the annular grinding head, and a grinding guide sleeve is nested on the outside of the grinding guide rod. The grinding guide sleeve is fixedly connected to the main rotating sleeve.

[0024] The annular grinding head is vertically slidably connected to the main rotating sleeve through the cooperation of the grinding guide rod and the grinding guide sleeve, and a grinding clamping spring is provided on the grinding guide rod.

[0025] Furthermore, a central guide sleeve is provided at the center of the inner side of the central support tube, and a central clamping column is slidably nested inside the central guide sleeve;

[0026] The bottom end of the central clamping column is provided with a pin contact head for clamping the liquid injection pin during grinding. A pressure compensation spring is provided between the central guide sleeve and the pin contact head.

[0027] Furthermore, the lifting drive mechanism includes a lifting guide column, a lifting processing frame, and a telescopic drive rod;

[0028] The lifting guide column is fixedly installed in the middle of the fixed base, and the lifting processing frame is installed on the outside of the lifting guide column and is vertically slidably connected to the lifting guide column through the lifting guide sleeve installed in its middle.

[0029] The heating fixing sleeve of the pre-cleaning mechanism, the central support tube of the pre-grinding mechanism, and the protective sleeve of the laser welding mechanism are all connected to the lifting processing frame.

[0030] The telescopic drive rod is located at the center of the lifting processing frame. The fixed end of the telescopic drive rod is connected to the fixed base, and its telescopic end is connected to the lifting processing frame to drive the entire lifting processing frame to rise and fall.

[0031] The bottom surface of the lifting processing frame is evenly provided with multiple processing positioning sleeves along the circumference. The bottom end of each processing positioning sleeve is provided with a conical opening. The top surface of the conveying turntable is provided with multiple processing positioning posts that correspond one-to-one with the processing positioning sleeves. When the lifting processing frame descends, the processing positioning sleeves are inserted and engaged with the corresponding processing positioning posts through the conical openings.

[0032] Furthermore, the fitting conveying groove is provided with a positioning and clamping mechanism inside;

[0033] The positioning and clamping mechanism includes a V-shaped fixing block and a V-shaped clamping block arranged opposite to each other, wherein the V-shaped fixing block is fixedly disposed on the inner side of the fitting conveying groove;

[0034] A fixed guide sleeve is fixedly provided on the outer side of the fitting conveying groove, and a linkage push rod is connected to the back of the V-shaped clamping block. The linkage push rod is nested and slidably connected to the fixed guide sleeve.

[0035] The reciprocating movement of the linkage push rod drives the V-shaped clamping block to move closer to or away from the V-shaped fixing block, so as to cooperate with the V-shaped fixing block to clamp, position or release the lithium battery.

[0036] Furthermore, the positioning and clamping mechanism also includes a ring-shaped guide rail fixedly mounted on the fixed base and arranged around the outside of the conveyor turntable;

[0037] The outer end of the linkage push rod is provided with a guide roller. When the conveyor turntable rotates, the guide roller abuts against and rolls along the contour of the annular guide track.

[0038] The ring-shaped guide rail is divided into segments according to the path, including a clamping segment, a release segment, and a guide connection segment connecting the two. The clamping segment is set on the outside of the pre-cleaning processing position, the pre-grinding processing position, and the laser welding processing position. The release segment is set on the outside of the loading position and the unloading position.

[0039] The distance between the clamping section and the conveying turntable is smaller than the distance between the release section and the conveying turntable;

[0040] When the conveyor turntable rotates, it drives the guide roller to move from the release section through the guide connection section to the clamping section. The annular guide rail pushes the linkage push rod to slide inward, causing the V-shaped clamping block and the V-shaped fixing block to cooperate to clamp the lithium battery.

[0041] Furthermore, the top of the side wall of the heating fixed sleeve is provided with an exhaust port, the top of the side wall of the central guide sleeve is provided with a dust suction port, and the bottom of the side wall of the main rotating sleeve and the bottom of the side wall of the insulating sleeve are both provided with balance air supply holes.

[0042] A negative pressure extraction box is provided on the outside of the fixed base. The inside of the negative pressure extraction box is filled with a filter element. A negative pressure fan is connected to one side of the negative pressure extraction box. The negative pressure extraction box is connected to the exhaust port and the dust suction port through connecting hoses.

[0043] The beneficial effects of this invention are as follows: As can be seen from the above description, the lithium battery electrolyte injection pin welding device provided by this invention uses an induction heating coil set on an insulating sleeve to locally and rapidly induction heat the surface of the internal electrolyte injection pin. The temperature rise causes the residual electrolyte adhering to the periphery of the electrolyte injection pin to evaporate. By using non-contact induction heating instead of traditional mechanical wiping, physical scratch damage to the soft electrolyte injection pin is avoided. This can remove liquid impurities in the welding area from the source and evaporate and remove residual electrolyte in advance. This can effectively avoid welding defects such as splashing, porosity, and explosion points caused by violent boiling of electrolyte due to high temperature during subsequent laser welding, thereby improving the pass rate of laser welding and the sealing quality of the weld. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is a front view of an embodiment of the present invention.

[0046] Figure 2 This is a schematic diagram of the structure of the fixed base according to an embodiment of the present invention;

[0047] Figure 3 This is a schematic diagram of the conveyor turntable according to an embodiment of the present invention;

[0048] Figure 4 This is a schematic diagram of the bottom structure of the conveyor turntable according to an embodiment of the present invention;

[0049] Figure 5 This is a schematic diagram of the internal structure of the conveyor turntable according to an embodiment of the present invention;

[0050] Figure 6 This is a partial structural diagram of the conveyor turntable according to an embodiment of the present invention;

[0051] Figure 7 This is a schematic diagram of the structure of the V-shaped clamping block according to an embodiment of the present invention;

[0052] Figure 8 This is a schematic diagram of the lifting processing frame according to an embodiment of the present invention;

[0053] Figure 9 This is a schematic diagram of the bottom structure of the lifting processing frame according to an embodiment of the present invention;

[0054] Figure 10 This is a schematic diagram of the pre-cleaning mechanism according to an embodiment of the present invention;

[0055] Figure 11 This is a schematic diagram of the pre-polishing mechanism according to an embodiment of the present invention;

[0056] Figure 12 This is a schematic diagram of the internal structure of the central support tube according to an embodiment of the present invention;

[0057] Figure 13 This is a schematic diagram of the laser welding mechanism according to an embodiment of the present invention;

[0058] Figure 14 This is a schematic diagram of the internal structure of the protective sleeve according to an embodiment of the present invention;

[0059] Figure 15 This is a schematic diagram of the negative pressure vacuum box according to an embodiment of the present invention.

[0060] The diagram is marked as follows:

[0061] 1. Fixed base; 11. Loading position; 12. Pre-cleaning processing position; 13. Pre-grinding processing position; 14. Laser welding processing position; 15. Unloading position; 2. Conveying turntable; 21. Rotary gear ring; 22. Conveying gear; 23. Conveying stepper motor; 24. Fitting conveying groove; 25. Machining positioning post; 3. Positioning and clamping mechanism; 31. V-shaped fixing block; 311. Fixed guide sleeve; 32. V-shaped clamping block; 321. Linkage push rod; 322. Clamping return spring 323. Guide roller; 33. Circular guide rail; 331. Clamping section; 332. Release section; 333. Guide connection section; 4. Lifting drive mechanism; 41. Lifting guide column; 411. Telescopic drive rod; 42. Lifting processing frame; 421. Lifting guide sleeve; 422. Processing positioning sleeve; 423. Conical opening; 5. Pre-cleaning mechanism; 51. Heating fixing sleeve; 511. Exhaust vent; 512. Buffer spring; 52. Insulating sleeve; 52 1. Induction heating coil; 522. Heating fitting port; 523. Contact sealing ring; 524. Balance air supply hole; 6. Pre-grinding mechanism; 61. Central support tube; 611. Central guide sleeve; 612. Central clamping column; 613. Pin contact head; 614. Pressure compensation spring; 615. Dust suction interface; 62. Main rotating sleeve; 621. Synchronous pulley; 622. Drive pulley; 623. Transmission belt; 624. Grinding drive motor; 63. Bottom sealing sleeve 631. Ring; 632. Isolation bearing; 64. End face sealing ring; 65. Ring-shaped grinding head; 661. Grinding guide rod; 642. Grinding guide sleeve; 643. Grinding clamping spring; 7. Laser welding mechanism; 71. Fixed support frame; 711. Laser generator; 712. Laser scanning galvanometer; 72. Protective sleeve; 721. Anti-scattering shield; 722. V-shaped matting reflector; 8. Negative pressure extraction box; 81. Connecting hose; 82. Negative pressure fan; 83. Filter element. Detailed Implementation

[0062] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0063] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0064] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 12 , Figure 13 , Figure 14 and Figure 15 As shown, a lithium battery electrolyte injection pin welding device includes:

[0065] The frame unit includes a fixed base 1 and a lifting drive mechanism 4 connected to the fixed base 1;

[0066] The conveying unit includes a conveying turntable 2 rotatably mounted above a fixed base 1, and a plurality of interlocking conveying slots 24 for holding lithium batteries to be processed are evenly arranged along the circumference of the conveying turntable 2.

[0067] The processing station unit is arranged around the top of the conveyor turntable 2. The processing station unit has a loading position 11, a pre-cleaning processing position 12, a pre-grinding processing position 13, a laser welding processing position 14 and a unloading position 15 arranged sequentially along the rotation path of the conveyor turntable 2. The conveyor turntable 2 is used to drive the lithium battery to circulate through each processing position in sequence.

[0068] The pre-cleaning mechanism 5 is set at the pre-cleaning processing position 12. The pre-cleaning mechanism 5 includes an insulating sleeve 52, which is connected to the lifting drive mechanism 4 to drive the insulating sleeve 52 to reciprocate in the vertical direction. An induction heating coil 521 is arranged around the outer wall of the insulating sleeve 52, and a heating fitting port 522 is provided at the bottom end of the insulating sleeve 52.

[0069] When the lithium battery moves to the pre-cleaning processing position 12, the lifting drive mechanism 4 drives the insulating sleeve 52 to descend, so that the heating fitting port 522 is nested on the outside of the lithium battery liquid injection pin, and the induction heating coil 521 performs local induction heating treatment on the liquid injection pin to evaporate the residual electrolyte around the liquid injection pin.

[0070] In this embodiment, the frame unit of the device serves as the supporting foundation of the overall equipment, including a fixed base 1 and a lifting drive mechanism 4 connected to the fixed base 1. The conveying unit includes a conveying turntable 2 rotatably disposed above the fixed base 1. Multiple interlocking conveying slots 24 are evenly arranged along the circumference on the table surface of the conveying turntable 2 for stably holding the lithium batteries to be processed. Through this mechanical layout that combines the base support and the turntable step conveying, the stable flow of the processed workpiece can be achieved, the shaking during operation can be reduced, the basic positioning guarantee for subsequent processing can be provided, and continuous processing can be easily realized.

[0071] The processing station units are arranged around the conveyor turntable 2, and along the rotation path of the conveyor turntable 2, there are sequentially arranged loading station 11, pre-cleaning processing station 12, pre-grinding processing station 13, laser welding processing station 14, and unloading station 15. In actual operation, a rotating gear ring 21 is arranged around the middle of the conveyor turntable 2, and a conveying gear 22 is meshed in the middle of the rotating gear ring 21. The shaft end of the conveying gear 22 is connected to a conveying stepper motor 23. Through the above driving structure, the conveyor turntable 2 is driven to rotate according to the set rhythm, and the lithium battery in the embedded conveying groove 24 is driven to circulate through the above processing stations in sequence. By adopting the multi-station ring distribution and the linkage design of the turntable rotation stepper, the originally independent loading and unloading, cleaning, grinding and welding processes are connected into an automated production line, and a highly efficient intelligent welding system is constructed. This avoids material handling between multiple machines, effectively shortens the processing cycle and improves the overall production efficiency.

[0072] To address the issue that electrolyte often remains in the lithium battery filling hole after the pin is inserted, this device is specially equipped with a pre-cleaning mechanism 5 at the pre-cleaning processing position 12. The pre-cleaning mechanism 5 includes an insulating sleeve 52. The top of the insulating sleeve 52 is connected to the lifting drive mechanism 4. The lifting drive mechanism 4 can drive the insulating sleeve 52 to move back and forth vertically. An induction heating coil 521 is arranged around the outer wall of the insulating sleeve 52, and a heating fitting port 522 is opened at its bottom end. The insulating sleeve 52 isolates the induction heating coil 521 from direct contact with external metal parts in physical space, preventing the risk of short circuit that may be caused by electromagnetic heating and improving the safety of the processing.

[0073] In the specific workflow, when the conveyor turntable 2 transports the lithium battery to be processed and stops at the pre-cleaning processing position 12, the lifting drive mechanism 4 on the frame is activated and drives the insulating sleeve 52 to move downward, so that the heating fitting port 522 at the bottom of the insulating sleeve 52 fits precisely over the outside of the liquid injection pin at the top of the lithium battery. Subsequently, the induction heating coil 521 is energized and operates, using high-frequency electromagnetic induction to perform localized and rapid induction heating on the surface of the liquid injection pin inside. The temperature rise causes the residual electrolyte adhering to the periphery of the liquid injection pin to evaporate, while simultaneously heating... The bottom surface of the mating joint 522 is provided with a contact sealing ring 523, which facilitates the maintenance of sealing and heat insulation. The use of non-contact induction heating instead of traditional mechanical wiping avoids physical scratch damage to the soft liquid injection pins and removes liquid impurities in the welding area from the source. It also evaporates and removes residual electrolyte in advance, which can effectively avoid welding defects such as spatter, porosity and explosion caused by violent boiling of electrolyte due to high temperature during subsequent laser welding by the intelligent welding system. This improves the pass rate of laser welding and the sealing quality of the weld.

[0074] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 12 , Figure 13 , Figure 14 and Figure 15 As shown, preferably, the pre-cleaning mechanism 5 of the device is also equipped with a heating fixing sleeve 51. The top end of the heating fixing sleeve 51 is directly connected to the lifting drive mechanism 4, while the insulating sleeve 52 is nested and slidably disposed at the bottom end of the heating fixing sleeve 51. In actual operation, the lifting drive mechanism 4 drives the heating fixing sleeve 51 to move, and then synchronously drives the insulating sleeve 52 nested at its bottom to move up and down.

[0075] In addition, a buffer spring 512 is fitted on the outside of the heating fixing sleeve 51. The two ends of the buffer spring 512 abut against the structural step between the heating fixing sleeve 51 and the insulating sleeve 52. When the lifting drive mechanism 4 drives the pre-cleaning mechanism 5 to move downward as a whole, and the bottom end of the insulating sleeve 52 just touches the top surface of the lithium battery, if the lifting drive mechanism 4 continues to maintain a certain downward stroke, the insulating sleeve 52 will be subjected to force and slide upward in the heating fixing sleeve 51, while compressing the buffer spring 512 between the two. Through the elastic deformation of the buffer spring 512, the original rigid mechanical drive is transformed into a flexible pressing state with buffer. It can automatically adapt to and compensate for the small height error between different lithium batteries, avoid overload impact caused by rigid downward pressure, effectively prevent battery shell deformation or damage to the liquid injection pin, thereby improving the yield and operational safety of the equipment in mass production.

[0076] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 12 , Figure 13 , Figure 14 and Figure 15 As shown, preferably, the device is equipped with a dedicated laser welding mechanism 7 at the laser welding processing position 14. This mechanism serves as the core execution unit of the entire intelligent welding system, used to complete the precision welding of the liquid-filled pins. The mechanism includes a fixed support frame 71 fixed to the fixed base 1. A laser scanning galvanometer 712 is integrated in the middle of the fixed support frame 71, while a laser generator 711 is arranged outside the laser scanning galvanometer 712. During actual processing, the laser generator 711 is activated and outputs a high-energy laser beam, which is transmitted to the laser source located at the center. The laser scanning galvanometer 712 of the part guides and focuses the laser beam on the annular joint between the lithium battery injection pin and the surrounding battery casing by rapidly deflecting the internal reflective mirror. Under the high-frequency irradiation of the laser beam, the metal material at the joint rapidly absorbs light energy, heats up and melts to form a local metal pool. As the scanning galvanometer controls the laser spot to move rapidly along the preset annular trajectory, the molten metal rapidly cools and solidifies after the light spot moves away, thereby forming a continuous and dense closed weld at the edge of the pin.

[0077] High-energy-density laser beams can achieve deep penetration and rapid welding, which allows for good control of the overall heat input during the welding process and a narrow heat-affected zone. This low-heat-input and concentrated welding method effectively prevents excessive heat from being conducted downwards to the inside of the battery and damaging the sensitive cell structure. While ensuring a high-strength and high-airtightness sealing connection of the injection hole, it also maintains the overall physical and chemical properties and safety of the battery.

[0078] The protective sleeve 72 is located below the fixed support frame 71 and is vertically slidably connected to the fixed support frame 71 through structural cooperation. At the same time, the protective sleeve 72 is connected to the lifting drive mechanism 4 and can move down to a predetermined height when performing welding tasks to cover the area of ​​the battery pin to be welded. This allows the welding operation to be carried out in a controlled space, preventing metal spatter generated during the welding process from spreading to other areas of the conveyor turntable 2 and maintaining the overall cleanliness and safety of the equipment.

[0079] An anti-scattering shield 721 is installed on the inner side of the protective sleeve 72. Multiple V-shaped extinction refraction plates 722 are uniformly arranged around the inner side of the shield in the circumferential direction. When the protective sleeve 72 descends to cover the welding area, the anti-scattering shield 721 and the battery surface together form a locally controlled optical protection cavity. During the laser welding process, the reflected laser and stray light generated at the welding point will be captured by the V-shaped extinction refraction plates 722 and refracted and attenuated multiple times through their unique geometric structure, which weakens the diffusion of reflected energy and reduces the thermal effect of stray light on optical components and surrounding parts. At the same time, it also reduces the interference of light energy scattering on welding quality, which is conducive to improving the stability of the welding process.

[0080] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 12 , Figure 13 , Figure 14 and Figure 15As shown, preferably, the device is equipped with a pre-grinding mechanism 6 at the pre-grinding processing position 13 to remove the oxide layer and impurities in the welding area. The mechanism includes a central support tube 61 connected to the lifting drive mechanism 4. A main rotating sleeve 62 is rotatably connected to the lower part of the central support tube 61. An annular grinding head 64 is nested inside the main rotating sleeve 62. In order to provide rotational power, a grinding drive motor 624 is fixedly connected to the outer side of the central support tube 61. A drive pulley 622 is provided at the shaft end of the motor. The drive pulley 622 and the synchronous pulley 621 coaxially nested at the top of the main rotating sleeve 62 are connected by a transmission belt 623. During operation, the grinding drive motor 624 drives the main rotating sleeve 62 to drive the annular grinding head 64 to rotate through the belt drive.

[0081] An isolation bearing 631 is provided at the bottom of the main rotating sleeve 62, and a bottom sealing ring 63 is connected below the isolation bearing 631. When pressing down for grinding, the bottom sealing ring 63 contacts the battery end face and remains stationary. The bottom end of the isolation bearing 631 is provided with an end face sealing ring 632 to maintain a seal while improving friction and mechanical energy for a certain degree of flexible protection. The main rotating sleeve 62 rotates at high speed inside under the support of the isolation bearing 631, which avoids the rotating sleeve from directly contacting and rubbing the non-grinding area of ​​the battery shell, thus playing a good physical limiting and protection role and reducing the risk of scratching the battery surface.

[0082] To optimize the polishing force, a polishing guide rod 641 is vertically connected to the top of the annular polishing head 64. A polishing guide sleeve 642, which is fixedly connected to the main rotating sleeve 62, is nested on the outside of the polishing guide rod 641, allowing the annular polishing head 64 to slide vertically. A polishing pressure spring 643 is also provided on the polishing guide rod 641. When the pre-polishing mechanism 6 descends and the annular polishing head 64 presses against the battery surface, the polishing head floats upward and compresses the polishing pressure spring 643, transforming the original rigid contact into a flexible fit with spring pressure. This can automatically compensate for the height error between different individual batteries and the daily wear of the polishing head, maintaining uniform and constant polishing pressure and preventing excessive cutting or local thinning of the shell due to excessive pressure.

[0083] In addition, a central guide sleeve 611 is provided at the center of the inner side of the central support tube 61. A central clamping column 612 is nested and slidably arranged inside the central guide sleeve 611. The bottom end of the central clamping column 612 is connected to a pin contact head 613 for contacting the liquid injection pin. A pressure compensation spring 614 is provided between the central guide sleeve 611 and the pin contact head 613. When the lifting drive mechanism 4 drives the grinding assembly to descend, the pin contact head 613 at the center will press the liquid injection pin at the center stably before the grinding head under the action of the pressure compensation spring 614. Then, the outer ring grinding head 64 will rotate and grind the welding surface around the pin. Through this combination of central clamping and outer grinding, the liquid injection pin can be effectively prevented from loosening or shifting position under the interference of grinding vibration or cutting force, thus ensuring the concentricity of the pin and the welding surface.

[0084] During the high-speed rotation of the main rotating sleeve 62 and the annular grinding head 64, the grinding surface at the bottom of the annular grinding head 64 will continuously undergo physical cutting and friction with the annular area to be welded around the liquid injection pin. This can remove the original metal oxide layer on the surface of the battery casing, trace amounts of electrolyte stains that may remain from previous processes, and dust and other impurities, cleaning the area to be welded and exposing the fresh metal substrate. At the same time, the surface after grinding will form a uniform micro-roughness. This surface state not only reduces the surface reflectivity during subsequent laser welding and improves the absorption and conversion efficiency of the metal material to laser energy, but also effectively reduces the generation of internal defects such as pores and slag inclusions in the weld pool, providing a clean, flat and structurally stable processing base for subsequent laser welding.

[0085] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 12 , Figure 13 , Figure 14 and Figure 15As shown, preferably, the lifting drive mechanism 4 of the device serves as the core motion component for linking each processing station, including a lifting guide column 41, a lifting processing frame 42, and a telescopic drive rod 411. The lifting guide column 41 is fixedly installed at the center of the fixed base 1. The lifting processing frame 42 is sleeved on the outside of the lifting guide column 41 and forms a vertical sliding connection with the lifting guide column 41 through the lifting guide sleeve 421 provided in its middle. The telescopic drive rod 411 is arranged at the center of the lifting processing frame 42 and has a pneumatic, hydraulic, or electric telescopic rod structure. Its fixed end is connected to the fixed base 1, and its telescopic end is connected to the bottom of the lifting processing frame 42. During operation, the movement of the telescopic drive rod 411 can directly drive the lifting processing frame 42 to rise or fall as a whole along the central guide column.

[0086] To achieve efficient collaborative operation of multiple workstations, the heating fixing sleeve 51 of the pre-cleaning mechanism 5, the central support tube 61 of the pre-grinding mechanism 6, and the protective sleeve 72 of the laser welding mechanism 7 are all uniformly connected and installed on the lifting processing frame 42. When the telescopic drive rod 411 drives the lifting processing frame 42 to move downward, it can simultaneously drive the execution components of multiple processing workstations such as cleaning, grinding, and welding to descend synchronously to the corresponding working height. By integrating multiple independent processing mechanisms on the same lifting frame and driving them with a single power source, the high consistency of the action sequence of each processing workstation is ensured. This enables the intelligent welding system composed of multiple mechanisms to complete the pre-treatment and welding process of the liquid injection pins with a coordinated and unified rhythm, demonstrating the automation advantages of the intelligent welding system in multi-process collaborative operation and improving the rhythm continuity of the whole machine operation.

[0087] In terms of precision control, to ensure accurate alignment during descent processing, multiple processing positioning sleeves 422 are evenly arranged circumferentially on the bottom surface of the lifting processing frame 42. Each of these processing positioning sleeves 422 has a tapered opening 423 at its bottom. Correspondingly, multiple processing positioning posts 25, each corresponding to a position of a processing positioning sleeve 422, are provided on the top surface of the conveyor turntable 2. When the lifting processing frame 42 descends under the drive of the telescopic drive rod 411, the processing positioning sleeves 422, using their tapered openings 423 at their bottom, first contact the processing positioning posts 25 on the conveyor turntable 2. Under the natural guidance of the tapered surface slope, a smooth insertion fit is achieved. This automatically corrects minor lateral offsets caused by mechanical clearances during the descent of the processing frame, ensuring precise spatial alignment between the upper processing components and the lower battery position. This provides a reliable positional reference for subsequent precision grinding and cutting, and laser spot focusing, contributing to improved overall process consistency and product qualification rate.

[0088] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5, Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 12 , Figure 13 , Figure 14 and Figure 15 As shown, preferably, the device is equipped with a positioning and clamping mechanism 3 inside each fitting conveying groove 24 of the conveying unit to ensure the stability of the lithium battery during the transfer and processing. The positioning and clamping mechanism 3 includes V-shaped fixing blocks 31 and V-shaped clamping blocks 32 arranged opposite to each other. The V-shaped fixing blocks 31 are directly fixedly installed on the inner side of the fitting conveying groove 24, and a fixing guide sleeve 311 is fixedly installed on the outer side of the fitting conveying groove 24. A linkage push rod 321 is connected to the back of the V-shaped clamping block 32. Passing through and sliding within the fixed guide sleeve 311, in actual operation, the reciprocating linear movement of the linkage push rod 321 can drive the V-shaped clamping block 32 to move closer to or away from the V-shaped fixed block 31, thereby achieving clamping and positioning or releasing of the lithium battery. Furthermore, the linkage push rod 321 is fitted with a clamping reset spring 322 for easy reset. The V-shaped clamping surface design with relative matching can generate a good self-centering effect on the outer wall of the lithium battery, ensuring that the battery position remains consistent after each clamping.

[0089] To achieve automatic control of clamping and releasing actions, the positioning and clamping mechanism 3 is also equipped with a ring-shaped guide rail 33 fixedly installed on the fixed base 1 and arranged around the periphery of the conveying turntable 2. At the same time, a guide roller 323 is installed on the outer end of the linkage push rod 321. When the conveying turntable 2 carries the lithium battery and rotates step by step at the work station, the guide roller 323 at the outer end of the linkage push rod 321 will always abut against and roll along the inner contour of the ring-shaped guide rail 33, directly converting the rotational motion of the conveying turntable 2 itself into the linear opening and closing power of the positioning and clamping mechanism 3. There is no need to configure pneumatic components or drive motors separately for each clamping work station on the turntable, which simplifies the pipeline layout and structural complexity on the rotating parts and makes the whole more reliable.

[0090] In terms of timing, the annular guide rail 33 is segmented according to its path contour, including a clamping section 331, a release section 332, and a guide connecting section 333 connecting the two. Specifically, the clamping section 331 is located on the outer areas of the pre-cleaning processing station 12, the pre-grinding processing station 13, and the laser welding processing station 14, and the distance between this section of the rail and the conveyor turntable 2 is relatively small. The release section 332 is located on the outer areas of the loading station 11 and the unloading station 15, and the distance between it and the turntable is relatively large. When the conveyor turntable 2 rotates, moving the battery-loaded station from the loading / unloading area to the processing area, the guide roller 323 moves along the... The track enters the clamping section 331 from the release section 332 through the smooth guide connection section 333. As the track spacing decreases, the annular guide track 33 will force the guide roller 323 to squeeze inward, thereby pushing the linkage push rod 321 to drive the V-shaped clamping block 32 to slide inward, cooperating with the V-shaped fixing block 31 to clamp the lithium battery. Through this contour change of the purely mechanical cam track, the spatial position and clamping action are rigidly bound, so that the workpiece is always in a stable clamped state at the processing station to resist processing vibration, while it is naturally in a loose state at the loading and unloading station to facilitate the picking and placing of materials. The action response is precise, and it is more flexible and convenient to use.

[0091] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 12 , Figure 13 , Figure 14 and Figure 15 As shown, preferably, in addition to achieving high-precision coordination and automated operation between each processing station, a control module is also provided inside the fixed base 1. Preferably, the control module is a programmable logic controller (PLC). This PLC controller is electrically connected to the conveyor stepper motor 23, the telescopic drive rod 411, the induction heating coil 521, the grinding drive motor 624, and the laser generator 711. The PLC controller has a pre-set process control program for real-time coordination of the action sequence of each actuator.

[0092] After the conveyor turntable 2 transports the lithium battery to the pre-cleaning processing position 12 and it is in place, the PLC controller first drives the telescopic drive rod 411 to descend, so that the insulating sleeve 52 is nested outside the liquid injection pin. At the same time, the induction heating coil 521 is activated according to the preset heating power and duration to complete the pre-cleaning of residual electrolyte by evaporation. Then, the PLC controller controls the conveyor turntable 2 to rotate stepwise, sending the lithium battery to the pre-grinding processing position 13. The telescopic drive rod 411 is driven to descend again and the grinding drive motor 624 is activated to complete the rotational grinding of the welding surface according to the preset speed and time. After that, the PLC controller continues to control the conveyor turntable 2 to send the lithium battery to the laser welding processing position 14. The telescopic drive rod 411 is driven to descend again, and the laser generator 711 and the laser scanning galvanometer 712 are activated according to the preset laser welding frequency, scanning path and output power to complete the airtight welding of the liquid injection pin and the battery shell. Finally, the PLC controller controls the conveyor turntable 2 to send the processed lithium battery to the unloading position 15.

[0093] Through centralized scheduling by the aforementioned PLC controller, the sequential transfer of lithium batteries between processing stations, the synchronous lifting and lowering of the lifting processing rack, and the parameterized control of each processing module can be achieved, forming a closed-loop collaborative intelligent welding system, which improves the consistency and automation level of the welding process;

[0094] To improve the processing environment and centrally treat the waste gas and waste generated during processing, a negative pressure extraction box 8 is installed on the outside of the fixed base 1. A negative pressure fan 82 is connected to one side of the negative pressure extraction box 8 as a power source. The inside of the negative pressure extraction box 8 is filled with a filter element 83 for filtering impurities. The negative pressure extraction box 8 is connected to the exhaust port 511 of the pre-cleaning mechanism 5 and the dust suction port 615 of the pre-grinding mechanism 6 through connecting hoses 81. When the equipment is running, the negative pressure fan 82 starts and forms a continuous negative pressure suction force inside the pipeline, which prevents harmful gases and fine metal dust from being directly discharged into the workshop air, thus maintaining the cleanliness of the production environment and the stable operation of the equipment.

[0095] At the pre-cleaning processing position 12, an exhaust port 511 is provided on the top of the side wall of the heating fixing sleeve 51. This exhaust port is connected to the connecting hose 81. At the same time, a balance air supply hole 524 is provided on the bottom of the side wall of the insulating sleeve 52. During the operation of the induction heating coil 521 heating the liquid injection pin to evaporate the residual electrolyte, the negative pressure vacuum box 8 continuously draws away the generated electrolyte vapor through the exhaust port 511. Since the insulating sleeve 52 has a balance air supply hole 524 at the bottom, fresh air from the outside can be continuously supplied into the inner cavity of the sleeve from the bottom, thereby forming a stable upward directional airflow in the cavity, which follows the physical trend of the hot steam rising naturally and accelerates the steam discharge efficiency. Similarly, at the pre-grinding processing position 13, the top of the side wall of the central guide sleeve 611... The end is provided with a dust suction port 615 and connected to the connecting hose 81. The bottom of the side wall of the main rotating sleeve 62 is also provided with a balance air supply hole 524. When the annular grinding head 64 rotates at high speed to cut the oxide layer around the liquid injection pin, metal shavings will be generated. The negative pressure suction force at the dust suction port 615, combined with the rising airflow introduced by the bottom balance air supply hole 524, can quickly roll the generated metal dust upward along the tube and remove it from the grinding area. This avoids the accumulation of metal shavings in the grinding area and secondary scratches on the battery surface. It also prevents dust from falling and invading the precision moving parts such as the rotating bearing or the guide rail of the conveyor turntable 2, causing mechanical wear. It maintains a high degree of cleanliness on the surface of the area to be welded, reduces the probability of defects such as weld inclusions and porosity during subsequent laser welding, and improves the welding sealing quality of the final product.

[0096] The lithium battery electrolyte injection pin welding device provided by this invention uses an induction heating coil 521 set on an insulating sleeve 52 to locally and rapidly inductively heat the surface of the internal electrolyte injection pin. The temperature rise causes the residual electrolyte adhering to the periphery of the electrolyte injection pin to evaporate. The non-contact induction heating replaces the traditional mechanical wiping, avoiding physical scratch damage to the soft electrolyte injection pin. It can remove liquid impurities in the welding area from the source and evaporate and remove residual electrolyte in advance. This can effectively avoid welding defects such as spatter, porosity and explosion caused by violent boiling of electrolyte due to high temperature during subsequent laser welding, thereby improving the overall processing qualification rate of the intelligent welding system and the sealing quality of the weld.

[0097] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity. Any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A lithium battery electrolyte injection pin welding device, characterized in that, include: The frame unit includes a fixed base (1) and a lifting drive mechanism (4) connected to the fixed base (1); The conveying unit includes a conveying turntable (2) rotatably disposed above the fixed base (1), and the conveying turntable (2) is provided with a plurality of interlocking conveying slots (24) for holding lithium batteries to be processed evenly along the circumference. The processing station unit is arranged around the top of the conveyor turntable (2). The processing station unit has a loading position (11), a pre-cleaning processing position (12), a pre-grinding processing position (13), a laser welding processing position (14), and a unloading position (15) arranged sequentially along the rotation path of the conveyor turntable (2). The conveyor turntable (2) is used to drive the lithium battery to circulate through each processing position in sequence. A pre-cleaning mechanism (5) is provided at the pre-cleaning processing position (12). The pre-cleaning mechanism (5) includes an insulating sleeve (52). The insulating sleeve (52) is connected to the lifting drive mechanism (4) to drive the insulating sleeve (52) to reciprocate in the vertical direction. An induction heating coil (521) is provided around the outer wall of the insulating sleeve (52). A heating fitting port (522) is provided at the bottom end of the insulating sleeve (52). A laser welding mechanism (7) is disposed at the laser welding processing position (14); When the lithium battery moves to the pre-cleaning processing position (12), the lifting drive mechanism (4) drives the insulating sleeve (52) to descend, so that the heating fitting port (522) is nested on the outside of the lithium battery liquid injection pin, and the liquid injection pin is locally induction heated by the induction heating coil (521) to evaporate the residual electrolyte around the liquid injection pin.

2. The lithium battery electrolyte injection pin welding device according to claim 1, characterized in that, The pre-cleaning mechanism (5) also includes a heated fixing sleeve (51); The heating fixing sleeve (51) is connected to the lifting drive mechanism (4) for transmission, and the insulating sleeve (52) is nested and slidably disposed at the bottom end of the heating fixing sleeve (51); The buffer spring (512) is sleeved on the outside of the heating fixed sleeve (51) and abuts between the heating fixed sleeve (51) and the insulating sleeve (52). When the lifting drive mechanism (4) drives the heating fixed sleeve (51) to move, it simultaneously drives the insulating sleeve (52) to move up and down.

3. The lithium battery electrolyte injection pin welding device according to claim 2, characterized in that, The laser welding mechanism (7) includes a fixed support frame (71), a laser scanning galvanometer (712), a laser generator (711), and a protective sleeve (72); The fixed support frame (71) is fixedly connected to the fixed base (1). A laser scanning galvanometer (712) is provided in the middle of the fixed support frame (71), and the laser generator (711) is located on the outside of the laser scanning galvanometer (712). The protective sleeve (72) is located below the fixed support frame (71) and is vertically slidably connected to the fixed support frame (71). The protective sleeve (72) is also connected to the lifting drive mechanism (4) in a transmission manner. The inner side of the protective sleeve (72) is provided with an anti-scattering shield (721), and the inner side of the anti-scattering shield (721) is uniformly surrounded by multiple V-shaped extinction refraction plates (722).

4. The lithium battery electrolyte injection pin welding device according to claim 3, characterized in that, The pre-grinding processing position (13) is provided with a pre-grinding mechanism (6), which includes a central support tube (61) connected to the lifting drive mechanism (4); A main rotating sleeve (62) is rotatably connected below the central support tube (61), and an annular grinding head (64) is nested inside the main rotating sleeve (62). The bottom of the main rotating sleeve (62) is provided with an isolation bearing (631), and a bottom sealing collar (63) is connected below the isolation bearing (631). The bottom sealing collar (63) is rotatably connected to the main rotating sleeve (62) through the isolation bearing (631). A synchronous pulley (621) is coaxially nested on the outer side of the top end of the main rotating sleeve (62). A grinding drive motor (624) is fixedly connected to the outer side of the central support tube (61). A drive pulley (622) is provided at the shaft end of the grinding drive motor (624). The drive pulley (622) and the synchronous pulley (621) are connected by a transmission belt (623) to drive the main rotating sleeve (62) to rotate the annular grinding head (64).

5. The lithium battery electrolyte injection pin welding device according to claim 4, characterized in that, The top of the annular grinding head (64) is connected to a grinding guide rod (641) in the vertical direction. A grinding guide sleeve (642) is nested on the outside of the grinding guide rod (641). The grinding guide sleeve (642) is fixedly connected to the main rotating sleeve (62). The annular grinding head (64) is vertically slidably connected to the main rotating sleeve (62) through the cooperation of the grinding guide rod (641) and the grinding guide sleeve (642), and a grinding pressure spring (643) is provided on the grinding guide rod (641).

6. The lithium battery electrolyte injection pin welding device according to claim 5, characterized in that, A central guide sleeve (611) is provided at the center of the inner side of the central support tube (61), and a central pressing column (612) is nested and slidably provided on the inner side of the central guide sleeve (611). The bottom end of the central clamping column (612) is provided with a pin contact head (613) for clamping the liquid injection pin during grinding. A pressure compensation spring (614) is provided between the central guide sleeve (611) and the pin contact head (613).

7. The lithium battery electrolyte injection pin welding device according to claim 6, characterized in that, The lifting drive mechanism (4) includes a lifting guide column (41), a lifting processing frame (42), and a telescopic drive rod (411); The lifting guide column (41) is fixedly installed in the middle of the fixed base (1), and the lifting processing frame (42) is installed on the outside of the lifting guide column (41) and is vertically slidably connected to the lifting guide column (41) through the lifting guide sleeve (421) installed in the middle of it; The heating fixing sleeve (51) of the pre-cleaning mechanism (5), the central support tube (61) of the pre-grinding mechanism (6) and the protective sleeve (72) of the laser welding mechanism (7) are all connected to the lifting processing frame (42); The telescopic drive rod (411) is located at the center of the lifting processing frame (42). The fixed end of the telescopic drive rod (411) is connected to the fixed base (1), and its telescopic end is connected to the lifting processing frame (42) to drive the lifting processing frame (42) to lift as a whole. The bottom surface of the lifting processing frame (42) is uniformly provided with a plurality of processing positioning sleeves (422) along the circumference. The bottom end of the processing positioning sleeve (422) is provided with a conical opening (423). The top surface of the conveying turntable (2) is provided with a plurality of processing positioning posts (25) corresponding one-to-one with the processing positioning sleeves (422). When the lifting processing frame (42) descends, the processing positioning sleeve (422) is inserted and engaged with the corresponding processing positioning post (25) through the conical opening (423).

8. The lithium battery electrolyte injection pin welding device according to claim 7, characterized in that, The fitting conveying groove (24) is provided with a positioning clamping mechanism (3) inside; The positioning and clamping mechanism (3) includes a V-shaped fixing block (31) and a V-shaped clamping block (32) arranged opposite to each other. The V-shaped fixing block (31) is fixedly arranged on the inner side of the fitting conveying groove (24). A fixed guide sleeve (311) is fixedly provided on the outside of the fitting conveying groove (24), and a linkage push rod (321) is connected to the back of the V-shaped clamping block (32). The linkage push rod (321) and the fixed guide sleeve (311) are nested and slidably connected. By reciprocating the linkage push rod (321), the V-shaped clamping block (32) is driven to move closer to or further away from the V-shaped fixing block (31) so as to cooperate with the V-shaped fixing block (31) to clamp, position or release the lithium battery.

9. The lithium battery electrolyte injection pin welding device according to claim 8, characterized in that, The positioning and clamping mechanism (3) further includes a ring-shaped guide rail (33) fixedly mounted on the fixed base (1) and arranged around the outside of the conveying turntable (2); The outer end of the linkage push rod (321) is provided with a guide roller (323). When the conveying turntable (2) rotates, the guide roller (323) abuts against and rolls along the contour of the annular guide track (33). The ring-shaped guide rail (33) is divided into segments according to the path, including a clamping section (331), a release section (332), and a guide connecting section (333) connecting the two. The clamping section (331) is set on the outside of the pre-cleaning processing position (12), the pre-grinding processing position (13), and the laser welding processing position (14). The release section (332) is set on the outside of the loading position (11) and the unloading position (15). The distance between the clamping section (331) and the conveying turntable (2) is smaller than the distance between the release section (332) and the conveying turntable (2); When the conveyor turntable (2) rotates, it drives the guide roller (323) to move from the release section (332) through the guide connection section (333) to the clamping section (331). The annular guide rail (33) pushes the linkage push rod (321) to slide inward, which drives the V-shaped clamping block (32) to cooperate with the V-shaped fixing block (31) to clamp the lithium battery.

10. The lithium battery electrolyte injection pin welding device according to claim 9, characterized in that, The heating fixing sleeve (51) has an exhaust port (511) on the top of its side wall, the center guide sleeve (611) has a dust suction port (615) on the top of its side wall, and the main rotating sleeve (62) and the insulating sleeve (52) both have a balance air supply hole (524) on the bottom of their side walls. A negative pressure suction box (8) is provided on the outside of the fixed base (1). The inside of the negative pressure suction box (8) is filled with a filter element (83). A negative pressure fan (82) is connected to one side of the negative pressure suction box (8). The negative pressure suction box (8) is connected to the exhaust port (511) and the dust suction port (615) respectively through a connecting hose (81).

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