Sealing device for lithium battery production

Abstract

The invention discloses a sealing device for lithium battery production, and relates to the technical field of sealing devices for lithium battery production, the sealing device for lithium battery production comprises a workbench, support legs are fixed on the bottom surface of the workbench, a protection box is fixed on the upper surface of the workbench, and a conveying mechanism is fixed on the upper surface of the workbench. According to the sealing device for lithium battery production, after equipment detects that a lithium battery moves into a protection box along with a conveying mechanism, the lithium battery is intercepted through cooperation with a first fixing plate, a suspension spring, an extrusion rod, a return spring and an interception block, and the situation that the lithium battery continues to move along with the conveying mechanism, and consequently sealing omission occurs in sealing work is avoided; in addition, workers do not need to stop the conveying mechanism repeatedly during working, the working efficiency of sealing work is improved, meanwhile, it is avoided that due to repeated opening and closing of parts in equipment, the service life is shortened, and the problem that the device needs to be stopped repeatedly during working on an assembly line is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the sealing device technical field of lithium battery production, in particular to a sealing device for lithium battery production. BACKGROUND

[0002] Lithium battery sealing is a key process of cell packaging, and the core role is to seal the cell shell, prevent electrolyte leakage and ensure the stability of the battery structure. Its technical level directly affects the safety, cycle life and production efficiency of the battery. The mainstream sealing methods include mechanical pressing, laser welding and ultrasonic welding. Among them, mechanical pressing is suitable for soft package battery aluminum plastic film packaging, and laser welding is commonly used for square or cylindrical battery metal shell sealing.

[0003] However, the square or cylindrical battery metal shell needs to be manually supported by the staff when sealing, otherwise it is likely to fall during sealing, resulting in errors in sealing work. This working method requires a large amount of manpower and is not suitable for existing assembly line production, resulting in low production and processing efficiency, and there is a risk of laser injury when the staff manually supports laser cutting. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a sealing device for lithium battery production, which solves the problems raised in the background art.

[0005] To achieve the above purpose, the following technical scheme is adopted: a sealing device for lithium battery production, comprising a workbench, the bottom surface of the workbench is fixed with supporting legs, the upper surface of the workbench is fixed with a protective box, the upper surface of the workbench is fixed with a conveying mechanism, the side wall of the protective box is fixed with an infrared emitter, the side wall of the protective box is fixed with an infrared sensor, the front of the protective box is fixed with a controller, the infrared sensor and the controller are electrically connected, the upper surface of the protective box is fixed with a gas cylinder, the controller and the gas cylinder are electrically connected, the bottom surface of the gas cylinder is connected with a piston rod, the piston rod penetrates through the upper surface of the protective box and is connected by sliding at the penetrating position, the end of the piston rod away from the gas cylinder is fixed with a welding mechanism, the upper surface of the inner wall of the welding mechanism is fixed with a laser welder, the controller and the laser welder are electrically connected, the inside of the welding mechanism is provided with an intercepting device for intercepting lithium batteries, and the inside of the welding mechanism is provided with a turbulence device for heat dissipation of lithium batteries. The intercepting device comprises a first fixed plate, a suspension spring, an extrusion rod, a return spring, an intercepting block, a positioning rod, a sliding sheet, a reset spring, a fixed disc and an extrusion block, and the first fixed plate is fixedly connected to the side wall of the inner wall of the welding mechanism.

[0006] According to the technical scheme, the suspension spring is fixedly connected to the bottom surface of the first fixed plate, the extrusion rod is fixedly connected to one end of the suspension spring away from the first fixed plate, the side wall of the extrusion rod is attached to the side wall of the inner wall of the welding mechanism, and the return spring is fixedly connected to the side wall of the inner wall of the welding mechanism.

[0007] According to the technical scheme, the intercepting block is fixedly connected to one end of the return spring away from the side wall of the welding mechanism, the positioning rod penetrates through the side wall of the welding mechanism and is slidingly connected at the penetration position, one end of the positioning rod away from the side wall of the welding mechanism is fixedly connected with the arc-shaped gasket, and the sliding sheet is fixedly connected to the upper surface of the positioning rod.

[0008] According to the technical scheme, the reset spring is fixedly connected to the side wall of the sliding sheet, the fixed disc is fixedly connected to the side wall of the inner wall of the welding mechanism, one end of the reset spring away from the sliding sheet is fixedly connected to the side wall of the fixed disc, and the extrusion block is fixedly connected to the side wall of the intercepting block.

[0009] According to the technical scheme, the turbulence device comprises a rotating rod, a spiral groove, a ball and a fan blade, the rotating rod penetrates through the side wall of the welding mechanism and is rotationally connected at the penetration position, and the rotating rod penetrates through the sliding sheet and is attached at the penetration position.

[0010] According to the technical scheme, the spiral groove is arranged on the outer wall of the rotating rod, the ball is fixedly connected to the inner wall of the penetration position of the sliding sheet by the rotating rod, the outer wall of the ball is attached to the inner wall of the spiral groove, and the fan blade is fixedly connected to one end of the rotating rod away from the side wall of the welding mechanism. When the sealing of the lithium battery is completed and the equipment is reset, the rotating rod, the spiral groove and the ball are cooperated to rotate the fan blade, the air above the lithium battery is disturbed, the flow speed of the air above the lithium battery is accelerated, so that the air forms a weak air current and contacts the sealing position above the lithium battery.

[0011] According to the technical scheme, the inner part of the welding mechanism is provided with an impact device for cleaning the splashes, the impact device comprises a cam, a second fixed plate, a tensile spring and a knocking plate, the rotating rod penetrates through the cam and is fixedly connected at the penetration position, and the cam is rotationally connected to the side wall of the inner wall of the welding mechanism.

[0012] According to the technical scheme, the second fixed plate is fixedly connected to the side wall of the inner wall of the welding mechanism, the tension spring is fixedly connected to the bottom surface of the second fixed plate, and the knocking plate is fixedly connected to the end of the tension spring away from the second fixed plate, so that the positioning rod and the arc-shaped gasket at the end thereof are knocked by the cam, the second fixed plate, the tension spring and the knocking plate when the intercepting device positions the lithium battery or resets the intercepting device, so that the positioning rod and the arc-shaped gasket are shaken.

[0013] The application provides a sealing device for lithium battery production. 1. The intercepting device is provided, and after the equipment detects that the lithium battery moves into the protection box along with the conveying mechanism, the lithium battery is intercepted by the first fixed plate, the suspension spring, the extrusion rod, the return spring and the intercepting block, so that the lithium battery continues to move along with the conveying mechanism, thereby avoiding the leakage of the sealing work and the like, and the conveying mechanism does not need to be repeatedly stopped by the staff during work, the working efficiency of the sealing work is improved, the service life of the components in the equipment is avoided from being shortened due to repeated opening and closing, and the problem that the device needs to be repeatedly stopped during work on the assembly line is solved; after the lithium battery is intercepted, the lithium battery is positioned and fixed by the positioning rod, the sliding sheet, the return spring, the fixed disc and the extrusion block, so that the lithium battery is not unstable due to the friction force between the conveying mechanism and the contact surface after being intercepted, thereby preventing the lithium battery from being tilted without sealing or deviated due to the inaccurate placement position of the staff, and the problem that the lithium battery may be tilted or deviated when being forcedly fixed on the conveying mechanism is solved.

[0014] 2. The flow disturbing device is provided, and when the sealing of the lithium battery is completed and the equipment is reset, the fan blade is rotated by the rotating rod, the spiral groove and the ball, the air above the lithium battery is disturbed, the flow speed of the air above the lithium battery is accelerated, so that the air forms a weak air current, the sealing position above the lithium battery is contacted, the heat dissipation efficiency of the sealing position around the lithium battery after the sealing is completed is improved, and the problem that the lithium battery is relatively hot after the laser sealing is completed and is prone to defects such as air bulging is solved.

[0015] 3. The impact device is provided, and when the intercepting device positions the lithium battery or resets the intercepting device, the positioning rod and the arc-shaped gasket at the end thereof are knocked by the cam, the second fixed plate, the tension spring and the knocking plate, so that the positioning rod and the arc-shaped gasket are shaken, the metal scraps cooled on the surface of the positioning rod and the arc-shaped gasket during the laser welding are shaken off, so that the metal scraps are not attached to the sealing position due to the influence of the heat suction during the sealing and welding of the next lithium battery, the sealing position is not prone to burrs and the like, and the problem that the metal scraps generated during the sealing of the lithium battery may cause burrs and the like is solved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the whole structure schematic diagram of the application; Figure 2 It is the partial section structure schematic diagram of the protective box of the application; Figure 3 It is the internal structure schematic diagram of the protective box of the application; Figure 4 It is the partial intercepting device and impact device structure schematic diagram of the application; Figure 5 It is the half section structure schematic diagram of the protective box of the application; Figure 6 It is the partial intercepting device structure schematic diagram of the application; Figure 7 It is the partial spoiler device and impact device structure schematic diagram of the application; Figure 8 It is the partial intercepting device and impact device structure schematic diagram of the application; Figure 7 It is the local enlarged structure schematic diagram of area A.

[0017] In the figure: 1, workbench; 2, support leg; 3, protective box; 4, conveying mechanism; 5, infrared emitter; 6, infrared sensor; 7, controller; 8, air cylinder; 9, welding mechanism; 10, laser welder; 111, first fixed plate; 112, suspension spring; 113, extrusion rod; 114, return spring; 115, intercepting block; 116, positioning rod; 117, sliding sheet; 118, reset spring; 119, fixed disc; 1110, extrusion block; 121, rotating rod; 122, helical groove; 123, ball; 124, fan blade; 131, cam; 132, second fixed plate; 133, tension spring; 134, knocking plate. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0019] Please refer to Figures 1-8One embodiment of the present application is: a sealing device for lithium battery production, comprising a workbench 1, the bottom surface of the workbench 1 is fixed with supporting legs 2, the upper surface of the workbench 1 is fixed with a protective box 3, the upper surface of the workbench 1 is fixed with a conveying mechanism 4, when sealing the lithium battery, the staff places the lithium battery vertically above the conveying mechanism 4, the conveying mechanism 4 drives the lithium battery to move, the side wall of the protective box 3 is fixed with an infrared emitter 5, when the lithium battery moves to the same level with the infrared emitter 5 along with the conveying mechanism 4, the infrared emitted by the infrared emitter 5 is blocked by the lithium battery, the side wall of the protective box 3 is fixed with an infrared sensor 6, the front of the protective box 3 is fixed with a controller 7, the infrared sensor 6 and the controller 7 are electrically connected, when the infrared sensor 6 cannot receive the infrared, it sends an electric signal to the controller 7, the upper surface of the protective box 3 is fixed with a gas cylinder 8, the controller 7 and the gas cylinder 8 are electrically connected, the bottom surface of the gas cylinder 8 is connected with a piston rod, the piston rod penetrates through the upper surface of the protective box 3 and is connected by sliding, the end of the piston rod away from the gas cylinder 8 is fixed with a welding mechanism 9, the upper surface of the inner wall of the welding mechanism 9 is fixed with a laser welder 10, the controller 7 and the laser welder 10 are electrically connected, after the controller 7 receives the electric signal, it controls the gas cylinder 8 and the laser welder 10 to start, at this time, the conveying mechanism 4 continues to drive the lithium battery to move, after the gas cylinder 8 starts, it controls the piston rod to slide downward, the piston rod drives the welding mechanism 9 to move downward, the inside of the welding mechanism 9 is provided with an intercepting device for intercepting the lithium battery, when the lithium battery moves to the directly below of the welding mechanism 9, the welding mechanism 9 and the intercepting device in it intercept the lithium battery, the laser welder 10 preheats during the downward movement of the welding mechanism 9, after the lithium battery is intercepted and fixed, the laser welder 10 seals the lithium battery.

[0020] The intercepting device comprises a first fixed plate 111, a suspension spring 112, a pressing rod 113, a return spring 114, an intercepting block 115, a positioning rod 116, a sliding sheet 117, a reset spring 118, a fixed disc 119 and a pressing block 1110. The first fixed plate 111 is fixedly connected to the side wall of the inner wall of the welding mechanism 9. The suspension spring 112 is fixedly connected to the bottom surface of the first fixed plate 111. The pressing rod 113 is fixedly connected to the end of the suspension spring 112 away from the first fixed plate 111. The side wall of the pressing rod 113 is attached to the side wall of the inner wall of the welding mechanism 9. When the welding mechanism 9 moves downward, the pressing rod 113 also moves downward. When the pressing rod 113 moves downward to contact the conveying mechanism 4, the pressing rod 113 slides upward relative to the welding mechanism 9 under the pushing force of the conveying mechanism 4, and the suspension spring 112 is compressed at the same time. The return spring 114 is fixedly connected to the side wall of the inner wall of the welding mechanism 9. The intercepting block 115 is fixedly connected to the end of the return spring 114 away from the side wall of the welding mechanism 9. When the pressing rod 113 slides to the intercepting block 115, the intercepting block 115 is pushed to move towards the center of the welding mechanism 9, and the return spring 114 is stretched. When the intercepting blocks 115 on the front and back sides move towards the center of the welding mechanism 9, they approach each other. The two groups of intercepting blocks 115 approach each other to intercept the lithium battery, preventing the lithium battery from continuing to move with the conveying mechanism 4. The positioning rod 116 penetrates through the side wall of the welding mechanism 9 and is slidingly connected at the penetration position. The end of the positioning rod 116 away from the side wall of the welding mechanism 9 is fixedly connected with an arc-shaped gasket. The sliding sheet 117 is fixedly connected to the upper surface of the positioning rod 116. The two groups of sliding sheets 117 slidingly drive the positioning rod 116 to approach each other. The arc-shaped gasket at the end of the positioning rod 116 positions the lithium battery to prevent the lithium battery from deviating. The reset spring 118 is fixedly connected to the side wall of the sliding sheet 117. When the two groups of sliding sheets 117 slide towards the center of the welding mechanism 9, they approach each other and stretch the reset spring 118. The fixed disc 119 is fixedly connected to the side wall of the inner wall of the welding mechanism 9. The end of the reset spring 118 away from the sliding sheet 117 is fixedly connected to the side wall of the fixed disc 119. The pressing block 1110 is fixedly connected to the side wall of the intercepting block 115. When the intercepting blocks 115 approach each other, the pressing block 1110 is driven to move towards the sliding sheet 117. When the pressing block 1110 moves to contact the sliding sheet 117, the sliding sheet 117 is pushed to slide towards the center of the welding mechanism 9. The intercepting device intercepts the lithium battery in cooperation with the first fixed plate 111, the suspension spring 112, the pressing rod 113, the return spring 114 and the intercepting block 115 after the equipment detects that the lithium battery moves with the conveying mechanism 4 into the protection box 3, avoiding the lithium battery from continuing to move with the conveying mechanism 4, thereby causing the sealing work to leak and other situations.Solve the problem of repeated stop device on the pipeline work, After intercepting the lithium battery, cooperate with the positioning rod 116, sliding sheet 117, reset spring 118, fixed disc 119 and extrusion block 1110 to position and fix the lithium battery, avoid the lithium battery after being intercepted due to the friction force of the contact surface between the conveying mechanism 4 and the lithium battery, resulting in unstable chassis, so that the lithium battery is not sealed in the case of dumping, or due to the inaccurate placement position of the staff, resulting in the offset of the sealing position, solve the problem that the lithium battery may be dumped or offset when being forced to fix on the conveying mechanism 4.

[0021] When the lithium battery is sealed, the staff places the lithium battery vertically above the conveying mechanism 4, the conveying mechanism 4 drives the lithium battery to move, when the lithium battery moves with the conveying mechanism 4 to be flush with the infrared emitter 5, the infrared emitted by the infrared emitter 5 is blocked by the lithium battery, at this time the infrared sensor 6 cannot receive the infrared, sends an electric signal to the controller 7, the controller 7 receives the electric signal and controls the cylinder 8 and the laser welder 10 to start, at this time the conveying mechanism 4 continues to drive the lithium battery to move, the cylinder 8 starts to control the piston rod to slide downward, the piston rod drives the welding mechanism 9 to move downward, when the lithium battery moves to the right below the welding mechanism 9, the welding mechanism 9 and the intercepting device in it intercept the lithium battery, in the process of moving downward, the laser welder 10 is preheated, when the lithium battery is intercepted and fixed, the laser welder 10 seals the lithium battery.

[0022] When the welding mechanism 9 moves downward, the extrusion rod 113 is also moved downward, when the extrusion rod 113 moves downward to contact the conveying mechanism 4, the extrusion rod 113 is pushed upward relative to the welding mechanism 9 by the pushing force of the conveying mechanism 4, and the suspension spring 112 is compressed, when the extrusion rod 113 slides to the intercepting block 115, the side of the extrusion rod 113 slides with the inclined surface of the intercepting block 115, the extrusion rod 113 pushes the intercepting block 115 to move to the center of the welding mechanism 9, and the return spring 114 is stretched, when the two intercepting blocks 115 on the front and back sides move to the center of the welding mechanism 9, they move close to each other, the two groups of intercepting blocks 115 close to each other to intercept the lithium battery, preventing the lithium battery from continuing to move with the conveying mechanism 4, when the intercepting blocks 115 move close to each other, the extrusion block 1110 moves to the direction of the sliding piece 117, when the extrusion block 1110 moves to contact the sliding piece 117, the inclined surface of the extrusion block 1110 slides with the side of the sliding piece 117, the extrusion block 1110 pushes the sliding piece 117 to slide to the center of the welding mechanism 9, when the two groups of sliding pieces 117 slide to the center of the welding mechanism 9, they move close to each other, and the return spring 118 is stretched, the two groups of sliding pieces 117 slide to drive the positioning rod 116 to move close to each other, the arc-shaped pad at the end of the positioning rod 116 positions the lithium battery to prevent the position of the lithium battery from deviating, when the laser welder 10 completes the sealing of the lithium battery, the welding mechanism 9 rises upward, at this time, the extrusion rod 113 is no longer pushed, and is reset by the elastic force of the recovery of the suspension spring 112, the intercepting block 115 is no longer pushed, and is reset by the elastic force of the recovery of the return spring 114, the intercepting block 115 is reset to drive the extrusion block 1110 to reset, the sliding piece 117 is no longer pushed by the extrusion block 1110, and is reset by the elastic force of the recovery of the return spring 118, the intercepting device rises with the welding mechanism 9, and no longer intercepts the lithium battery, the sealed lithium battery moves out of the protection box 3 with the conveying mechanism 4.

[0023] Please refer to Figures 1-8On the basis of the above-mentioned embodiment, in another embodiment of the present application, the inside of the welding mechanism 9 is provided with a flow disturbing device for heat dissipation of the lithium battery, the flow disturbing device comprises a rotating rod 121, a spiral groove 122, a ball 123 and a fan blade 124, the rotating rod 121 penetrates the side wall of the welding mechanism 9 and is rotationally connected at the penetration position, the rotating rod 121 penetrates the sliding sheet 117 and is attached at the penetration position, the spiral groove 122 is arranged on the outer wall of the rotating rod 121, the ball 123 is fixedly connected to the inner wall of the penetration position of the sliding sheet 117 by the rotating rod 121, when the sliding sheet 117 slides, the ball 123 also moves, the outer wall of the ball 123 is attached to the inner wall of the spiral groove 122, so that the ball 123 also slides along the spiral groove 122 when it moves, since the ball 123 can only move horizontally relative to the rotating rod 121, when the ball 123 slides along the spiral groove 122, it drives the spiral groove 122 to rotate, the rotation of the spiral groove 122 drives the rotating rod 121 to rotate, the fan blade 124 is fixedly connected to one end of the rotating rod 121 away from the side wall of the welding mechanism 9, the rotation of the rotating rod 121 drives the fan blade 124 to rotate, and the air around the lithium battery which has just completed sealing is disturbed, when the sealing of the lithium battery is completed and the equipment is reset, the rotating rod 121, the spiral groove 122 and the ball 123 cooperate to make the fan blade 124 rotate, the air above the lithium battery is disturbed, the flow speed of the air above the lithium battery is accelerated, so that the air forms a weak air current, contacts the sealing position above the lithium battery, and improves the heat dissipation efficiency of the sealing position around the lithium battery after the sealing of the lithium battery is completed, and solves the problem that the lithium battery is relatively hot around the lithium battery after the laser sealing is just completed, and is prone to have defects such as air bulging.

[0024] The inside of the welding mechanism 9 is provided with a splash impact device for cleaning, which comprises a cam 131, a second fixed plate 132, a tension spring 133 and a knocking plate 134. The rotating rod 121 penetrates through the cam 131 and is fixedly connected at the penetration position. When the rotating rod 121 rotates, the cam 131 is also driven to rotate. The cam 131 is rotatably connected to the side wall of the inner wall of the welding mechanism 9. The second fixed plate 132 is fixedly connected to the side wall of the inner wall of the welding mechanism 9. The tension spring 133 is fixedly connected to the bottom surface of the second fixed plate 132. The knocking plate 134 is fixedly connected to one end of the tension spring 133 away from the second fixed plate 132. When the protruding end of the cam 131 rotates to the position of the knocking plate 134, the knocking plate 134 is pushed to slide downward, and the positioning rod 116 is impacted to vibrate, so that the metal scraps splashed on the positioning rod 116 during the sealing welding of the lithium battery are shaken off. When the knocking plate 134 slides downward, the tension spring 133 is also stretched. When the protruding end of the cam 131 gradually moves away from the knocking plate 134, the pushing force acting on the knocking plate 134 decreases, and at the same time, the knocking plate 134 is subjected to the restoring force of the tension spring 133, so as to slide upward to reset. When the intercepting device positions the lithium battery or resets, the cam 131, the second fixed plate 132, the tension spring 133 and the knocking plate 134 cooperate to knock the positioning rod 116 and the arc-shaped gasket at the end of the positioning rod 116, so that the positioning rod 116 and the arc-shaped gasket are shaken, and the metal scraps splashed on the surface of the positioning rod 116 and the arc-shaped gasket during the laser welding are shaken off, thereby avoiding that the metal scraps are attached to the sealing position due to the heat absorption during the sealing welding of the next lithium battery, so as to avoid burrs and other defects at the sealing position. The problem that the metal scraps generated during the sealing of the lithium battery may cause burrs and other defects is solved.

[0025] When the sliding piece 117 slides, the ball 123 also moves, and the outer wall of the ball 123 is attached to the inner wall of the spiral groove 122, so that the ball 123 also slides along the spiral groove 122 when moving. Since the ball 123 can only move in the horizontal direction relative to the rotating rod 121, the ball 123 drives the spiral groove 122 to rotate when sliding along the spiral groove 122. The rotating of the spiral groove 122 drives the rotating rod 121 to rotate, and the rotating rod 121 drives the fan blade 124 to rotate, so as to disturb the air around the lithium battery which has just been sealed, and accelerate the flow speed of the air.

[0026] When the rotating rod 121 rotates, the cam 131 also rotates. When the protruding end of the cam 131 rotates to the knocking plate 134, the outer wall of the cam 131 and the upper surface of the knocking plate 134 slide with each other. The cam 131 pushes the knocking plate 134 to slide downward, and hits the positioning rod 116, so that the positioning rod 116 vibrates, and the metal scraps splashed on the positioning rod 116 during the sealing welding of the lithium battery are shaken off. When the knocking plate 134 slides downward, the tensile spring 133 is also stretched. When the protruding end of the cam 131 gradually moves away from the knocking plate 134, the pushing force on the knocking plate 134 decreases, and the knocking plate 134 slides upward to reset under the pulling force of the restoring of the tensile spring 133.

[0027] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A sealing device for lithium battery production, comprising a workbench (1), characterized in that: The bottom surface of the workbench (1) is fixed with supporting legs (2), the upper surface of the workbench (1) is fixed with a protection box (3), the upper surface of the workbench (1) is fixed with a conveying mechanism (4), the side wall of the protection box (3) is fixed with an infrared emitter (5), the side wall of the protection box (3) is fixed with an infrared sensor (6), the front of the protection box (3) is fixed with a controller (7), the infrared sensor (6) and the controller (7) are electrically connected, the upper surface of the protection box (3) is fixed with a gas cylinder (8), the controller (7) and the gas cylinder (8) are electrically connected, the bottom surface of the gas cylinder (8) is connected with a piston rod, the piston rod penetrates through the upper surface of the protection box (3) and is connected by sliding at the penetrating position, one end of the piston rod away from the gas cylinder (8) is fixed with a welding mechanism (9), the inner wall of the welding mechanism (9) is fixed with a laser welder (10), the controller (7) and the laser welder (10) are electrically connected, the welding mechanism (9) is internally provided with an intercepting device for intercepting lithium batteries, and the welding mechanism (9) is internally provided with a spoiler device for heat dissipation of lithium batteries. The intercepting device comprises a first fixed plate (111), a suspension spring (112), an extrusion rod (113), a return spring (114), an intercepting block (115), a positioning rod (116), a sliding sheet (117), a reset spring (118), a fixed disc (119) and an extrusion block (1110), and the first fixed plate (111) is fixedly connected to the side wall of the inner wall of the welding mechanism (9).

2. The sealing device for lithium battery production according to claim 1, characterized in that: The suspension spring (112) is fixedly connected to the bottom surface of the first fixed plate (111), the extrusion rod (113) is fixedly connected to one end of the suspension spring (112) away from the first fixed plate (111), and the side wall of the extrusion rod (113) is attached to the side wall of the inner wall of the welding mechanism (9).

3. The sealing device for lithium battery production of claim 2, wherein: The intercepting block (115) is fixedly connected to one end of the return spring (114) away from the side wall of the welding mechanism (9), the positioning rod (116) penetrates through the side wall of the welding mechanism (9) and is connected by sliding at the penetrating position, one end of the positioning rod (116) away from the side wall of the welding mechanism (9) is fixed with an arc-shaped gasket, and the sliding sheet (117) is fixedly connected to the upper surface of the positioning rod (116).

4. The sealing device for lithium battery production of claim 3, wherein: The reset spring (118) is fixedly connected to the side wall of the sliding sheet (117), the fixed disc (119) is fixedly connected to the side wall of the inner wall of the welding mechanism (9), one end of the reset spring (118) away from the sliding sheet (117) is fixedly connected to the side wall of the fixed disc (119), and the extrusion block (1110) is fixedly connected to the side wall of the intercepting block (115).

5. The sealing device for lithium battery production of claim 1, wherein: Said spoiler device includes rotating rod (121), spiral groove (122), ball (123) and fan blade (124), rotating rod (121) penetrates the side wall of welding mechanism (9), and is rotationally connected at the penetration, rotating rod (121) penetrates sliding sheet (117), and is fitted at the penetration.

6. The sealing device for lithium battery production of claim 5, wherein: Said spiral groove (122) is arranged on the outer wall of rotating rod (121), ball (123) is fixedly connected on the inner wall of sliding sheet (117) penetrated by rotating rod (121), the outer wall of ball (123) is fitted with the inner wall of spiral groove (122), and fan blade (124) is fixedly connected on one end of rotating rod (121) away from the side wall of welding mechanism (9).

7. The sealing device for lithium battery production of claim 1, wherein: The inside of welding mechanism (9) is provided with impact device for cleaning splashes, the impact device includes cam (131), second fixed plate (132), tension spring (133) and knocking plate (134), rotating rod (121) penetrates cam (131), and is fixedly connected at the penetration, and cam (131) is rotationally connected on the side wall of the inner wall of welding mechanism (9).

8. The sealing device for lithium battery production of claim 7, wherein: Said second fixed plate (132) is fixedly connected on the side wall of the inner wall of welding mechanism (9), tension spring (133) is fixedly connected on the bottom surface of second fixed plate (132), and knocking plate (134) is fixedly connected on one end of tension spring (133) away from second fixed plate (132).

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