Spot welding device for lithium battery manufacturing and spot welding process thereof

Abstract

The invention relates to the technical field of spot welding devices, in particular to a spot welding device for lithium battery manufacturing and a spot welding process thereof.The spot welding device comprises a base and a sucking pump fixedly connected to the side wall of the base, an air cylinder is fixedly connected to the upper end of the sucking pump, a connecting rod is fixedly connected to the bottom end of the air cylinder, and a lifting frame is fixedly connected to the bottom end of the connecting rod; a battery pack is placed on the lower side of the lifting frame and located on the base, and a guide pipe is communicated between the sucking pump and the lifting frame. According to the spot welding device for lithium battery manufacturing and the spot welding technology of the spot welding device, when the lifting rod rotates till the first magnetic block corresponds to the second magnetic block, sundries can fall off through gas sucked in by the sucking pump before spot welding, and then whether the lifting rod and the electric welding head need to move downwards or not can be automatically recognized; the redundant lifting rod and the electric welding head are prevented from being driven to move up and down, mechanical energy consumed by the air cylinder is reduced, when the first magnetic block corresponds to the third magnetic block, gas downwards pushes the lifting rod, falling of the lifting rod is accelerated, and therefore the overall efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of spot welding devices, in particular to a spot welding device for lithium battery manufacturing and a spot welding process thereof. Background Art

[0002] Lithium batteries use lithium metal or lithium alloy as the negative electrode material and a non-aqueous electrolyte solution. Therefore, this type of battery is also called a lithium metal battery. Nowadays, many devices that require electricity need to combine lithium batteries together to form a lithium battery pack for power supply. Here, the individual lithium batteries are generally connected by spot welding nickel sheets.

[0003] The Chinese invention patent with publication number CN113210821A, when in use, the driving unit drives the connecting plate to move downward, allowing the spot welding machine to spot weld the nickel sheet to the lithium battery. After the spot welding is completed, the nickel sheet spot welded to the lithium battery is separated from the nickel sheet on the rotating wheel. In this way, each row of lithium batteries in the fixture can be welded with a single spot welding operation. The operation is simple and greatly improves the spot welding efficiency of lithium batteries.

[0004] However, different models of lithium battery packs require different numbers of welding parts per row. If the number of welding parts per row is small, the above invention also requires all spot welders to be moved downward, which will cause the redundant spot welders to also be moved up and down, thereby increasing mechanical work, consuming more energy, and increasing production costs. In addition, the welded battery packs cool naturally too slowly, reducing production speed. Summary of the Invention

[0005] In order to solve the above problems, the present invention provides a spot welding device and a spot welding process for lithium battery manufacturing.

[0006] The present invention adopts the following technical solution: a spot welding device for lithium battery manufacturing, comprising a base and an air pump fixed to the side wall of the base, wherein the upper end of the air pump is fixedly connected to a cylinder, the lower end of the cylinder is fixedly connected to a connecting rod, the lower end of the connecting rod is fixedly connected to a lifting frame, the lower side of the lifting frame is located on the base and a battery pack is placed, a conduit is connected between the air pump and the lifting frame, and further comprising: An air blowing mechanism, capable of blowing away debris and dissipating heat, is disposed in the lifting frame and includes a lifting rod, and an electric welding head is fixedly connected to the bottom end of the lifting rod; An automatic identification mechanism capable of automatically identifying whether there is a battery underneath, the automatic identification mechanism being disposed within the blowing mechanism; And an acceleration mechanism, which can accelerate the downward movement of the electric welding head, and the acceleration mechanism is arranged in the blowing mechanism.

[0007] As a further description of the above technical solution: The lifting rod is movably arranged in the lifting frame, the lower end of the electric welding head extends to the lower side of the lifting frame, a gas storage cavity is arranged on one side of the lifting rod in the lifting frame, a guide groove is arranged in the lifting rod, an air outlet hole is arranged at the bottom end of the lifting rod, and the gas storage cavity, the guide groove and the air outlet hole are communicated with each other.

[0008] As a further description of the above technical solution: The automatic recognition mechanism includes a fixed ring fixedly connected in the lifting rod, a magnetic rod is horizontally slidably arranged on one side of the lifting rod at the upper end of the lifting frame, and a first spring is fixedly connected between the bottom end of the magnetic rod and the lifting frame. A fourth magnetic block is fixedly connected to the lower surface of the upper end of the base, and the fourth magnetic block is located on the side of the magnetic rod away from the lifting rod. A first magnetic block is fixedly connected to the top end of the lifting rod. A second magnetic block abuts against one side of the first magnetic block, and the second magnetic block is fixedly connected in the base. A third magnetic block is fixedly connected in the base above the lifting rod. An inclined sliding surface is arranged at the bottom end of the fixed ring, and sliding grooves are arranged on the outer walls of the lifting rod and the fixed ring.

[0009] As a further description of the above technical solution: The acceleration mechanism includes a conical groove, which is arranged in the middle of the lifting rod. Limiting grooves are arranged on the inner walls of two opposite sides of the upper part of the sliding groove. Limiting columns are inserted on the outer walls of two opposite sides of the end of the magnetic rod close to the lifting rod. A second spring is fixedly connected between the end of the limiting column located in the magnetic rod and the magnetic rod. Slopes are arranged on two opposite sides of the end of the limiting column extending outside the magnetic rod. A slot hole is arranged at the upper end of the lifting rod, and the slot hole is communicated with the inner cavity of the conical groove.

[0010] As a further description of the above technical solution: A plurality of the lifting rods are equidistantly arranged along the length and width directions of the lifting frame.

[0011] As a further description of the above technical solution: Each of the gas storage cavities is communicated with an air extraction pump.

[0012] As a further description of the above technical solution: The inclined sliding surface is opened at an angle of 180 degrees.

[0013] As a further description of the above technical solution: When the second magnetic block adsorbs to the first magnetic block, the magnetic rod corresponds to the outer wall of the fixed ring where the inclined sliding surface is not opened. When the third magnetic block adsorbs to the first magnetic block, the magnetic rod corresponds to the inclined sliding surface.

[0014] In addition, the present invention adopts the following technical solution, a spot welding process for a spot welding device used in lithium battery manufacturing, including the following steps: S1. First, place the battery pack on the upper surface of the lower end of the base, then place the nickel sheet directly above the battery pack, and ensure that there is an electric welding head above each lithium battery; S2: Start the air extraction pump. The air extraction pump sucks gas into the gas storage cavity, causing the gas to be discharged from the guide groove and the air outlet holes to the lower side of the lifting frame, so that the gas can be sprayed downward onto the battery pack, and the sundries can fall off through the gas before spot welding; S3: Start the cylinder. Move the lifting frame downward through the connecting rod. The gas pushes the lifting rod downward, which can accelerate the falling of the lifting rod, and then perform spot welding; S4: After the spot welding is completed, first turn off the air extraction pump, move the lifting frame upward through the cylinder, and then start the air extraction pump again, so that the gas is ejected from the air outlet holes, which can accelerate the cooling of the spot welding area.

[0015] The present invention provides a spot welding device and a spot welding process for lithium battery manufacturing through improvement. Compared with the prior art, it has the following improvements and advantages: First: When the lifting rod rotates to correspond to the first magnetic block and the second magnetic block, the gas sucked in by the air extraction pump can make the sundries fall off before spot welding. After the spot welding is completed, the gas is ejected from the air outlet holes, which can accelerate the cooling of the spot welding area and further improve the efficiency; Second: It can automatically identify whether the lifting rod and the welding head need to move downward through the thrust of the gas, preventing the unnecessary up and down movement of the redundant lifting rods and welding heads, and reducing the mechanical energy consumed by the cylinder; Third: When the first magnetic block corresponds to the third magnetic block, the gas can push the lifting rod downward, accelerating the falling of the lifting rod, thereby improving the overall efficiency; In summary, when the lifting rod rotates to correspond to the first magnetic block and the second magnetic block, the gas sucked in by the air extraction pump can make the sundries fall off before spot welding, and then it can automatically identify whether the lifting rod and the welding head need to move downward, preventing the unnecessary up and down movement of the redundant lifting rods and welding heads, reducing the mechanical energy consumed by the cylinder, and when the first magnetic block corresponds to the third magnetic block, the gas can push the lifting rod downward, accelerating the falling of the lifting rod, thereby improving the overall efficiency. After the spot welding is completed, the gas is ejected from the air outlet holes, which can accelerate the cooling of the spot welding area and further improve the efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following further explains the present invention in conjunction with the drawings and embodiments: Figure 1 It is a schematic structural diagram of a spot welding device for lithium battery manufacturing provided by an embodiment of the present invention; Figure 2 It is a schematic structural diagram of the lifting frame provided by an embodiment of the present invention; Figure 3 It is a three-dimensional sectional view of the lifting frame provided by an embodiment of the present invention; Figure 4 It is a schematic structural diagram of the inclined sliding surface provided by an embodiment of the present invention; Figure 5 It is a schematic structural diagram of the chute provided by an embodiment of the present invention; Figure 6 Structural schematic diagram of the conical groove provided by the embodiment of the present invention; Figure 7 is Figure 3 The enlarged view of part A in Figure 8 is Figure 6 The enlarged view of part B in

[0017] In the figure: 1, base; 2, air pump; 3, cylinder; 4, battery pack; 5, lifting frame; 6, conduit; 7, welding head; 8, air blowing mechanism; 81, lifting rod; 82, air storage cavity; 83, guide groove; 84, air outlet hole; 9, connecting rod; 10, automatic recognition mechanism; 101, fixing ring; 102, magnetic rod; 103, first spring; 104, first magnetic block; 105, second magnetic block; 106, third magnetic block; 107, inclined sliding surface; 108, sliding groove; 109, fourth magnetic block; 11, acceleration mechanism; 111, conical groove; 112, limiting groove; 113, limiting column; 114, second spring; 115, inclined surface; 116, slot hole. Detailed implementation manners

[0018] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below with reference to specific drawings. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0019] Please refer to Figure 1 - Figure 8 , the embodiment of the present invention provides a technical solution: A spot welding device for manufacturing lithium batteries, including a base 1 and an air pump 2 fixedly connected to the side wall of the base 1. The upper end of the air pump 2 is fixedly connected with a cylinder 3. The bottom end of the cylinder 3 is fixedly connected with a connecting rod 9. The bottom end of the connecting rod 9 is fixedly connected with a lifting frame 5. A battery pack 4 is placed on the base 1 below the lifting frame 5. A conduit 6 is connected between the air pump 2 and the lifting frame 5. It further includes: An air blowing mechanism 8, which can blow away sundries and dissipate heat. The air blowing mechanism 8 is arranged in the lifting frame 5. The air blowing mechanism 8 includes a lifting rod 81, and the bottom end of the lifting rod 81 is fixedly connected with a welding head 7; An automatic recognition mechanism 10, which can automatically recognize whether there is a battery below. The automatic recognition mechanism 10 is arranged in the air blowing mechanism 8; And an acceleration mechanism 11, which can accelerate the downward movement of the welding head 7. The acceleration mechanism 11 is arranged in the air blowing mechanism 8.

[0020] A plurality of lifting rods 81 are equidistantly arranged along the length and width directions of the lifting frame 5.

[0021] Specifically, when the lifting rod 81 rotates to a position where the first magnet 104 and the second magnet 105 correspond to each other, the gas pumped in by the air pump 2 can cause debris to fall before spot welding. After that, it can automatically identify whether the lifting rod 81 and the welding head 7 need to move downward, preventing the unnecessary up-and-down movement of the redundant lifting rod 81 and welding head 7, reducing the mechanical energy consumed by the cylinder 3. And when the first magnet 104 corresponds to the third magnet 106, the gas can push the lifting rod 81 downward, accelerating the fall of the lifting rod 81, thereby improving the overall efficiency. After spot welding, the gas is ejected from the air outlet hole 84, which can accelerate the cooling of the spot welding area and further improve the efficiency.

[0022] In another embodiment provided by the present invention, the lifting rod 81 is movably arranged in the lifting frame 5, the lower end of the welding head 7 extends to the lower side of the lifting frame 5, an air storage cavity 82 is formed on one side of the lifting rod 81 in the lifting frame 5, a guide groove 83 is formed in the lifting rod 81, and an air outlet hole 84 is formed at the bottom end of the lifting rod 81. The air storage cavity 82, the guide groove 83 and the air outlet hole 84 are communicated with each other.

[0023] The automatic recognition mechanism 10 includes a fixed ring 101 fixedly connected to the inside of the lifting rod 81. A magnetic rod 102 is horizontally slidably arranged on one side of the lifting rod 81 at the upper end of the lifting frame 5, and a first spring 103 is fixedly connected between the bottom end of the magnetic rod 102 and the lifting frame 5. A fourth magnet 109 is fixedly connected to the lower surface of the upper end of the base 1, and the fourth magnet 109 is located on the side of the magnetic rod 102 away from the lifting rod 81. A first magnet 104 is fixedly connected to the top end of the lifting rod 81. A second magnet 105 abuts against one side of the first magnet 104. The second magnet 105 is fixedly connected to the inside of the base 1. A third magnet 106 is fixedly connected to the inside of the base 1 above the lifting rod 81. An inclined sliding surface 107 is formed at the bottom end of the fixed ring 101. A sliding groove 108 is formed on the outer walls of the lifting rod 81 and the fixed ring 101.

[0024] Each air storage cavity 82 is communicated with the air pump 2.

[0025] The opening angle of the inclined sliding surface 107 is 180 degrees.

[0026] When the second magnet 105 adsorbs the first magnet 104, the magnetic rod 102 corresponds to the outer wall of the fixed ring 101 where the inclined sliding surface 107 is not formed. When the third magnet 106 adsorbs the first magnet 104, the magnetic rod 102 corresponds to the inclined sliding surface 107.

[0027] Specifically, when the lifting rod 81 rotates to a position where the first magnet 104 and the second magnet 105 correspond to each other, the gas pumped in by the air pump 2 can cause debris to fall before spot welding. After that, it can automatically identify whether the lifting rod 81 and the welding head 7 need to move downward, preventing the unnecessary up-and-down movement of the redundant lifting rod 81 and welding head 7, reducing the mechanical energy consumed by the cylinder 3.

[0028] In another embodiment provided by the present invention, the acceleration mechanism 11 includes a conical groove 111 opened in the middle of the lifting rod 81. Limiting grooves 112 are opened on the inner walls of two opposite sides of the upper part of the sliding groove 108. Limiting columns 113 are inserted on the outer walls of two opposite ends of the magnetic rod 102 close to the lifting rod 81. A second spring 114 is fixedly connected between one end of the limiting column 113 located inside the magnetic rod 102 and the magnetic rod 102. Bevels 115 are opened on two opposite sides of one end of the limiting column 113 extending outside the magnetic rod 102. A slot hole 116 is opened at the upper end of the lifting rod 81, and the slot hole 116 is communicated with the inner cavity of the conical groove 111.

[0029] Specifically, when the first magnetic block 104 corresponds to the third magnetic block 106, the gas can push the lifting rod 81 downward to accelerate the falling of the lifting rod 81, thereby improving the overall efficiency. After spot welding is completed, the gas is ejected from the air outlet hole 84, which can accelerate the cooling of the spot welding part and further improve the efficiency.

[0030] Working principle: When using this device, first place the battery pack 4 on the upper surface of the lower end of the base 1, and then place the nickel sheet directly above the battery pack 4, and make sure that there is a welding head 7 above each lithium battery. Then start the air pump 2, and the air pump 2 pumps the gas into the air storage cavity 82, so that the gas is discharged from the guide groove 83 and the air outlet hole 84 to the lower side of the lifting frame 5, so that the gas can be sprayed downward onto the battery pack 4, and the sundries can be dropped by the gas before spot welding; If there is a corresponding battery directly below the guide groove 83, then after the gas is sprayed downward, there will be a strong reaction force, so that the lifting rod 81 can move upward, so that the first magnetic block 104 and the second magnetic block 105 are separated. After the first magnetic block 104 moves to the upper side, the first magnetic block 104 will be adsorbed by the third magnetic block 106, so that the third magnetic block 106 rotates automatically, so that the magnetic rod 102 corresponds to the inclined sliding surface 107. Then start the cylinder 3, and move the lifting frame 5 downward through the connecting rod 9, so that the magnetic rod 102 is away from the fourth magnetic block 109. Under the action of the first spring 103, the magnetic rod 102 is bounced to the inclined sliding surface 107, so that the inclined sliding surface 107 is squeezed, so that the fixed ring 101 and the lifting rod 81 rotate together, and the magnetic rod 102 enters the sliding groove 108, and then the lifting rod 81 will move downward; If there is no corresponding battery directly below the guide groove 83, then the gas is sprayed downward to the bottom end of the base 1, and the reaction force is small, and the upward driving force cannot separate the first magnetic block 104 from the second magnetic block 105. The second magnetic block 105 provides a fixed suction force, which can automatically distinguish the magnitude of the upward thrust; Meanwhile, the guide groove 83 is disengaged from the air storage cavity 82, allowing gas to enter the conical groove 111. The gas is discharged from the slot hole 116 and pushes the lifting rod 81 downward, accelerating the fall of the lifting rod 81. After the lifting rod 81 falls, the limit post 113 on the magnetic rod 102 will align with the limit groove 112. Under the elastic force of the second spring 114, the limit post 113 will insert into the limit groove 112 to limit the lifting rod 81 and prevent the lifting rod 81 from moving up and down again. Then, the lifting rod 81 and the welding head 7 move downward along with the connecting rod 9 to adjust the distance. After spot welding is completed, first turn off the air pump 2, and move the lifting frame 5 upward through the cylinder 3. When the upper end of the lifting rod 81 moves upward near the second magnet 105, the magnetic rod 102 is adsorbed by the fourth magnet 109, causing the magnetic rod 102 to disengage from the sliding groove 108. Due to the presence of the inclined surface 115, the limit post 113 can automatically disengage from the limit groove 112. Then, the second magnet 105 attracts the first magnet 104, causing the first magnet 104 and the lifting rod 81 to rotate and move upward together. Then, start the air pump 2 again, so that the gas is ejected from the air outlet hole 84, which can accelerate the cooling of the spot welding area. When it is necessary to move downward again to perform spot welding on the next battery pack 4, just start the cylinder 3 to automatically drive the required lifting rod 81 and welding head 7 to move downward.

[0031] A spot welding process for a spot welding device used in lithium battery manufacturing includes the following steps: S1: First, place the battery pack 4 on the upper surface of the lower end of the base 1, and then place the nickel sheet directly above the battery pack 4, and ensure that there is a welding head 7 above each lithium battery. S2: Start the air pump 2. The air pump 2 pumps gas into the air storage cavity 82, causing the gas to be discharged from the guide groove 83 and the air outlet hole 84 to the lower side of the lifting frame 5, so that the gas can be sprayed downward onto the battery pack 4, and the sundries can be dropped by the gas before spot welding. S3: Start the cylinder 3, move the lifting frame 5 downward through the connecting rod 9, and the gas pushes the lifting rod 81 downward, accelerating the fall of the lifting rod 81, and then perform spot welding. S4: After spot welding is completed, first turn off the air pump 2, move the lifting frame 5 upward through the cylinder 3, and then start the air pump 2 again, so that the gas is ejected from the air outlet hole 84, which can accelerate the cooling of the spot welding area.

[0032] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The descriptions in the above embodiments and the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A spot welding device for manufacturing lithium batteries, comprising a base (1) and an air extraction pump (2) fixedly connected to the side wall of the base (1). The upper end of the air extraction pump (2) is fixedly connected to a cylinder (3). The bottom end of the cylinder (3) is fixedly connected to a connecting rod (9). The bottom end of the connecting rod (9) is fixedly connected to a lifting frame (5). A battery pack (4) is placed on the base (1) below the lifting frame (5). A conduit (6) is connected between the air extraction pump (2) and the lifting frame (5). It is characterized in that, It further includes: A blowing mechanism (8) capable of blowing away sundries and dissipating heat. The blowing mechanism (8) is arranged inside the lifting frame (5). The blowing mechanism (8) includes a lifting rod (81), and a welding head (7) is fixedly connected to the bottom end of the lifting rod (81); An automatic recognition mechanism (10) capable of automatically recognizing whether there is a battery below. The automatic recognition mechanism (10) is arranged inside the blowing mechanism (8); And an acceleration mechanism (11) capable of accelerating the downward movement of the welding head (7). The acceleration mechanism (11) is arranged inside the blowing mechanism (8).

2. The spot welding device for manufacturing lithium batteries according to claim 1, characterized in that: The lifting rod (81) is movably arranged inside the lifting frame (5). The lower end of the welding head (7) extends to the lower side of the lifting frame (5). An air storage cavity (82) is formed on one side of the lifting rod (81) inside the lifting frame (5). A guide groove (83) is formed inside the lifting rod (81). An air outlet hole (84) is formed at the bottom end of the lifting rod (81). The air storage cavity (82), the guide groove (83) and the air outlet hole (84) are communicated with each other.

3. The spot welding device for manufacturing lithium batteries according to claim 2, characterized in that: The automatic recognition mechanism (10) includes a fixing ring (101) fixedly connected inside the lifting rod (81). A magnetic rod (102) is horizontally slidably arranged on one side of the lifting rod (81) at the upper end of the lifting frame (5). A first spring (103) is fixedly connected between the bottom end of the magnetic rod (102) and the lifting frame (5). A fourth magnetic block (109) is fixedly connected to the lower surface of the upper end of the base (1), and the fourth magnetic block (109) is located on the side of the magnetic rod (102) away from the lifting rod (81). A first magnetic block (104) is fixedly connected to the top end of the lifting rod (81). One side of the first magnetic block (104) abuts against a second magnetic block (105). The second magnetic block (105) is fixedly connected inside the base (1). A third magnetic block (106) is fixedly connected inside the base (1) above the lifting rod (81). An inclined sliding surface (107) is formed at the bottom end of the fixing ring (101). A sliding groove (108) is formed on the outer walls of the lifting rod (81) and the fixing ring (101).

4. The spot welding device for manufacturing lithium batteries according to claim 3, characterized in that: The acceleration mechanism (11) includes a conical groove (111). The conical groove (111) is formed in the middle of the lifting rod (81). Limiting grooves (112) are formed on the inner walls of two opposite sides of the upper part of the sliding groove (108). Limiting columns (113) are inserted on the outer walls of two opposite sides of one end of the magnetic rod (102) close to the lifting rod (81). A second spring (114) is fixedly connected between the end of the limiting column (113) located inside the magnetic rod (102) and the magnetic rod (102). Slanting surfaces (115) are formed on two opposite sides of the end of the limiting column (113) extending outside the magnetic rod (102). A slot hole (116) is formed at the upper end of the lifting rod (81), and the slot hole (116) is communicated with the inner cavity of the conical groove (111).

5. The spot welding device for manufacturing lithium batteries according to claim 4, characterized in that: A plurality of the lifting rods (81) are arranged at equal intervals along the length and width directions of the lifting frame (5).

6. The spot welding device for manufacturing lithium batteries according to claim 5, characterized in that: Each of the air storage cavities (82) is communicated with an air extraction pump (2).

7. The spot welding device for manufacturing lithium batteries according to claim 6, wherein: The inclined sliding surface (107) is formed at an angle of 180 degrees.

8. A spot welding device for manufacturing lithium batteries according to claim 7, characterized in that: When the second magnetic block (105) adsorbs to the first magnetic block (104), the magnetic rod (102) corresponds to the outer wall of the fixed ring (101) without the inclined sliding surface (107). When the third magnetic block (106) adsorbs to the first magnetic block (104), the magnetic rod (102) corresponds to the inclined sliding surface (107).

9. The spot welding process of a spot welding device for manufacturing lithium batteries, based on the spot welding device for manufacturing lithium batteries described in claim 8, characterized in that: It includes the following steps: S1. First, place the battery pack (4) on the upper surface of the lower end of the base (1). Then, place the nickel sheet directly above the battery pack (4), and ensure that there is a welding head (7) above each lithium battery. S2: Start the air pump (2). The air pump (2) pumps gas into the air storage cavity (82), causing the gas to be discharged from the guide groove (83) and the air outlet hole (84) to the lower side of the lifting frame (5), so that the gas can be sprayed downward onto the battery pack (4), enabling debris to fall off through the gas before spot welding. S3: Start the cylinder (3). Move the lifting frame (5) downward through the connecting rod (9). The gas pushes the lifting rod (81) downward, which can accelerate the fall of the lifting rod (81), and then perform spot welding. S4: After spot welding is completed, first turn off the air pump (2). Move the lifting frame (5) upward through the cylinder (3). Then, start the air pump (2) again, causing the gas to be ejected from the air outlet hole (84), which can accelerate the cooling of the spot welding area.

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