A spot welding device and spot welding process for lithium battery manufacturing

Abstract

The present invention relates to the technical field of spot welding devices, and in particular to a spot welding device for lithium battery manufacturing and a spot welding process thereof, comprising a base and an air pump fixed to the side wall of the base, the upper end of the air pump fixedly connected to a cylinder, the bottom end of the cylinder fixedly connected to a connecting rod, the bottom end of the connecting rod fixedly connected to a lifting frame, the lower side of the lifting frame is located on the base and a battery pack is placed, and a conduit is connected between the air pump and the lifting frame. The present invention provides a spot welding device for lithium battery manufacturing and a spot welding process thereof, when the lifting rod rotates to correspond to magnetic block one and magnetic block two, the gas sucked in by the air pump can make debris fall before spot welding, and then it can automatically identify whether the lifting rod and the welding head need to be moved down, preventing unnecessary lifting rods and welding heads from moving up and down, reducing the mechanical energy consumed by the cylinder, and when magnetic block one is corresponded to magnetic block three, the gas pushes the lifting rod downward, accelerating the fall of the lifting rod, thereby improving overall efficiency.

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:

[0007] 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;

[0008] An automatic identification mechanism capable of automatically identifying whether there is a battery underneath, the automatic identification mechanism being disposed within the blowing mechanism;

[0009] 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.

[0010] 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, an air storage chamber is opened in the lifting frame on one side of the lifting rod, a guide groove is opened in the lifting rod, and an air outlet is opened at the bottom end of the lifting rod, and the air storage chamber, guide groove and air outlet are connected.

[0011] As a further description of the above technical solution: the automatic identification mechanism includes a fixed ring fixed in the lifting rod, the upper end of the lifting frame is located on one side of the lifting rod and is provided with a magnetic rod for horizontal sliding, and a spring 1 is fixed between the bottom end of the magnetic rod and the lifting frame, a magnetic block 4 is fixed to the lower surface of the upper end of the base, and the magnetic block 4 is located on the side of the magnetic rod away from the lifting rod, the top of the lifting rod is fixed with a magnetic block 1, one side of the magnetic block 1 is in contact with a magnetic block 2, the magnetic block 2 is fixed in the base, and a magnetic block 3 is fixed in the base on the upper side of the lifting rod, the bottom end of the fixed ring is provided with an inclined sliding surface, and the lifting rod and the outer wall of the fixed ring are provided with sliding grooves.

[0012] As a further description of the above technical solution: the acceleration mechanism includes a conical groove, which is opened in the middle of the lifting rod, and limiting grooves are opened on the inner walls on both opposite sides of the upper part of the slide groove. Limiting columns are inserted into the two opposite outer walls of one end of the magnetic rod close to the lifting rod, and a spring 2 is fixedly connected between the end of the limiting column located inside the magnetic rod and the magnetic rod. Inclined surfaces are opened on both opposite sides of the end of the limiting column extending to the outside of the magnetic rod, and a slot hole is opened on the upper end of the lifting rod, and the slot hole is communicated with the inner cavity of the conical groove.

[0013] As a further description of the above technical solution: a plurality of lifting rods are arranged at equal intervals along the length and width of the lifting frame.

[0014] As a further description of the above technical solution: each of the air storage chambers is connected to an air pump.

[0015] As a further description of the above technical solution: the opening angle of the inclined sliding surface is 180 degrees.

[0016] As a further description of the above technical solution: when the second magnetic block is adsorbed with the first magnetic block, the magnetic rod corresponds to the outer wall of the fixed ring without the inclined sliding surface; when the third magnetic block is adsorbed with the first magnetic block, the magnetic rod corresponds to the inclined sliding surface.

[0017] In addition, the present invention adopts the following technical solution, a spot welding process of a spot welding device for lithium battery manufacturing, comprising the following steps:

[0018] 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;

[0019] S2: Start the vacuum pump, which draws gas into the gas storage chamber, so that the gas is discharged from the guide groove and the gas outlet to the lower side of the lifting frame, so that the gas can be sprayed downward to the battery pack, and the gas can make the debris fall off before spot welding;

[0020] S3: Start the cylinder and move the lifting frame downward through the connecting rod. The gas pushes the lifting rod downward, which can accelerate the fall of the lifting rod, and then spot welding is performed;

[0021] S4: When spot welding is completed, first turn off the vacuum pump, move the lifting frame upward through the cylinder, and then start the vacuum pump again to allow gas to spray out from the air outlet, which can accelerate the cooling of the spot welding area.

[0022] The present invention provides a spot welding device and spot welding process for lithium battery manufacturing through improvement, which has the following improvements and advantages compared with the prior art:

[0023] First, when the lifting rod rotates to the point where magnet block 1 and magnet block 2 correspond, the gas drawn in by the vacuum pump can remove debris before spot welding. After spot welding, the gas is ejected from the air outlet, which can accelerate the cooling of the spot weld and further improve efficiency.

[0024] Second, it can automatically identify whether the lifting rod and welding head need to move down through the thrust of the gas, preventing unnecessary lifting rods and welding heads from moving up and down, thereby reducing the mechanical energy consumed by the cylinder;

[0025] Third: When magnet one is aligned with magnet three, the gas can push the lifting rod downward, accelerating the descent of the lifting rod, thereby improving overall efficiency;

[0026] To sum up, when the lifting rod rotates to the point where magnet block one corresponds to magnet block two, the gas drawn in by the vacuum pump can cause debris to fall off before spot welding, and can then automatically identify whether the lifting rod and welding head need to be moved downward, preventing unnecessary lifting rods and welding heads from moving up and down, thereby reducing the mechanical energy consumed by the cylinder, and when magnet block one corresponds to magnet block three, the gas can push the lifting rod downward, accelerating the fall of the lifting rod, thereby improving overall efficiency. After spot welding is completed, gas is ejected from the air outlet, which can accelerate the cooling of the spot weld and further improve efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further explained below in conjunction with the accompanying drawings and examples:

[0028] Figure 1 A schematic structural diagram of a spot welding device for lithium battery manufacturing provided by an embodiment of the present invention;

[0029] Figure 2 A schematic structural diagram of a lifting frame provided in an embodiment of the present invention;

[0030] Figure 3 A three-dimensional cross-sectional view of a lifting frame provided in an embodiment of the present invention;

[0031] Figure 4 A schematic structural diagram of an inclined sliding surface provided in an embodiment of the present invention;

[0032] Figure 5 A schematic structural diagram of a chute provided in an embodiment of the present invention;

[0033] Figure 6 A schematic structural diagram of a tapered groove provided in an embodiment of the present invention;

[0034] Figure 7 for Figure 3 Enlarged view of point A in the middle;

[0035] Figure 8 for Figure 6 Enlarged view of point B in the middle.

[0036] In the figure: 1. base; 2. vacuum pump; 3. cylinder; 4. battery pack; 5. lifting frame; 6. guide tube; 7. welding head; 8. blowing mechanism; 81. lifting rod; 82. air storage chamber; 83. guide groove; 84. air outlet; 9. connecting rod; 10. automatic identification mechanism; 101. fixing ring; 102. magnetic rod; 103. spring 1; 104. magnetic block 1; 105. magnetic block 2; 106. magnetic block 3; 107. inclined sliding surface; 108. slide groove; 109. magnetic block 4; 11. acceleration mechanism; 111. conical groove; 112. limit groove; 113. limit column; 114. spring 2; 115. inclined surface; 116. slot hole. DETAILED DESCRIPTION

[0037] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below with reference to specific diagrams. It should be noted that the embodiments and features in the embodiments of this application can be combined with each other unless they conflict.

[0038] See also Figure 1 - Figure 8 The embodiment of the present invention provides a technical solution: a spot welding device for lithium battery manufacturing, comprising a base 1 and an air pump 2 fixed to the side wall of the base 1, a cylinder 3 fixed to the upper end of the air pump 2, a connecting rod 9 fixed to the bottom end of the cylinder 3, a lifting frame 5 fixed to the bottom end of the connecting rod 9, a battery pack 4 placed on the lower side of the lifting frame 5 on the base 1, a conduit 6 connecting the air pump 2 and the lifting frame 5, and further comprising:

[0039] The blowing mechanism 8 can blow away debris and dissipate heat. The blowing mechanism 8 is arranged in the lifting frame 5. The blowing mechanism 8 includes a lifting rod 81, and the bottom end of the lifting rod 81 is fixedly connected to the electric welding head 7;

[0040] An automatic identification mechanism 10 is capable of automatically identifying whether there is a battery underneath, and the automatic identification mechanism 10 is disposed within the blowing mechanism 8;

[0041] And the acceleration mechanism 11 can accelerate the downward movement of the welding head 7, and the acceleration mechanism 11 is arranged in the blowing mechanism 8.

[0042] A plurality of lifting rods 81 are arranged at equal intervals along the length and width of the lifting frame 5 .

[0043] Specifically, when the lifting rod 81 rotates to the point where magnet block 1 104 corresponds to magnet block 2 105, the gas drawn in by the vacuum pump 2 can cause debris to fall off before spot welding, and can then automatically identify whether the lifting rod 81 and the welding head 7 need to be moved downward, preventing unnecessary lifting rods 81 and welding heads 7 from moving up and down, thereby reducing the mechanical energy consumed by the cylinder 3. When magnet block 104 is aligned with magnet block 3 106, 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 is completed, the gas is ejected from the air outlet 84, which can accelerate the cooling of the spot weld and further improve efficiency.

[0044] In another embodiment provided by the present invention, a lifting rod 81 is movably arranged in the lifting frame 5, the lower end of the electric welding head 7 extends to the lower side of the lifting frame 5, an air storage chamber 82 is opened in the lifting frame 5 on one side of the lifting rod 81, a guide groove 83 is opened in the lifting rod 81, and an air outlet 84 is opened at the bottom end of the lifting rod 81, and the air storage chamber 82, the guide groove 83 and the air outlet 84 are connected.

[0045] The automatic identification mechanism 10 includes a fixed ring 101 fixed to the lifting rod 81, and the upper end of the lifting frame 5 is located on one side of the lifting rod 81 and is provided with a magnetic rod 102 for horizontal sliding, and a spring 103 is fixed between the bottom end of the magnetic rod 102 and the lifting frame 5, and a magnetic block 4 109 is fixed to the lower surface of the upper end of the base 1, and the magnetic block 4 109 is located on the side of the magnetic rod 102 away from the lifting rod 81, and a magnetic block 104 is fixed to the top of the lifting rod 81, and a magnetic block 2 105 is in contact with one side of the magnetic block 104, and the magnetic block 2 105 is fixed to the base 1, and a magnetic block 3 106 is fixed to the upper side of the lifting rod 81 in the base 1, and an inclined sliding surface 107 is provided at the bottom end of the fixed ring 101, and a sliding groove 108 is provided on the outer wall of the lifting rod 81 and the fixed ring 101.

[0046] Each air storage chamber 82 is connected to the air pump 2.

[0047] The inclined sliding surface 107 is opened at an angle of 180 degrees.

[0048] When the second magnet 105 is attracted to the first magnet 104 , the magnetic rod 102 corresponds to the outer wall of the fixing ring 101 without the inclined sliding surface 107 . When the third magnet 106 is attracted to the first magnet 104 , the magnetic rod 102 corresponds to the inclined sliding surface 107 .

[0049] Specifically, when the lifting rod 81 rotates to the position where the magnetic block 104 and the magnetic block 2 105 correspond, the gas drawn in by the vacuum pump 2 can cause debris to fall off before spot welding. Afterwards, it can automatically identify whether the lifting rod 81 and the welding head 7 need to be moved downward, thereby preventing unnecessary lifting rods 81 and the welding head 7 from moving up and down, thereby reducing the mechanical energy consumed by the cylinder 3.

[0050] In another embodiment provided by the present invention, the acceleration mechanism 11 includes a conical groove 111, which is opened in the middle of the lifting rod 81, and the inner walls on both opposite sides of the upper part of the slide groove 108 are provided with limiting grooves 112. The two opposite outer walls of the end of the magnetic rod 102 close to the lifting rod 81 are both inserted with limiting columns 113, and the end of the limiting column 113 located inside the magnetic rod 102 is fixedly connected to the magnetic rod 102 with a spring 2 114. The limiting column 113 extends to the end outside the magnetic rod 102 and is provided with inclined surfaces 115 on both opposite sides. The upper end of the lifting rod 81 is provided with a slot hole 116, and the slot hole 116 is communicated with the inner cavity of the conical groove 111.

[0051] Specifically, when magnet 104 is aligned with magnet 3 106 , the gas can push the lifting rod 81 downward, accelerating the fall of the lifting rod 81 , thereby improving the overall efficiency. After the spot welding is completed, the gas is ejected from the air outlet 84 , which can accelerate the cooling of the spot welding point and further improve the efficiency.

[0052] Working principle: When using this device, 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 make sure there is an electric welding head 7 above each lithium battery. Then start the vacuum pump 2, which draws gas into the gas storage chamber 82, so that the gas is discharged from the guide groove 83 and the air outlet 84 to the lower side of the lifting frame 5, so that the gas can be sprayed downward to the battery pack 4, and the gas can make debris fall off before spot welding;

[0053] If there is a corresponding battery on the lower side of the guide groove 83, the gas will have a strong reaction force after being sprayed downward, so that the lifting rod 81 can move upward, so that the magnetic block 104 and the magnetic block 2 105 are separated. After that, after the magnetic block 104 moves to the upper side, the magnetic block 104 will be attracted by the magnetic block 3 106, so that the magnetic block 3 106 automatically rotates, so that the magnetic rod 102 can correspond to the inclined sliding surface 107. Then, the cylinder 3 is started, and the lifting frame 5 is moved downward through the connecting rod 9, so that the magnetic rod 102 is away from the magnetic block 4 109. Under the action of the 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 fixing ring 101 and the lifting rod 81 rotate together, the magnetic rod 102 enters the slide groove 108, and then the lifting rod 81 moves downward;

[0054] If there is no corresponding battery directly below the guide groove 83, the gas will be sprayed downward to the bottom of the base 1, and the reaction force will be small. The upward thrust will not be able to separate the first magnetic block 104 from the second magnetic block 105. The second magnetic block 105 provides a fixed suction force and can automatically distinguish the size of the upward thrust.

[0055] At the same time, the guide groove 83 is separated from the gas storage chamber 82, and the gas can enter the conical groove 111. The gas is discharged from the slot 116, and the gas pushes the lifting rod 81 downward, which can accelerate 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 be inserted into the limit groove 112, limiting the lifting rod 81 and preventing the lifting rod 81 from moving up and down again. After that, the lifting rod 81 and the welding head 7 move downward along with the connecting rod 9 to adjust the distance;

[0056] When the spot welding is completed, the vacuum pump 2 is first turned off, and the lifting frame 5 is moved up by the cylinder 3. When the upper end of the lifting rod 81 moves up to the vicinity of the second magnetic block 105, the magnetic rod 102 is adsorbed by the fourth magnetic block 109, so that the magnetic rod 102 is disengaged from the slide groove 108. Due to the provision of the inclined surface 115, the limiting column 113 can automatically disengage from the limiting groove 112. Then the second magnetic block 105 will attract the first magnetic block 104, so that the first magnetic block 104 and the lifting rod 81 rotate and move up together. Then the vacuum pump 2 is started again to make the gas ejected from the air outlet 84, which can accelerate the cooling of the spot welding point. When it is necessary to move down again to spot weld the next battery pack 4, starting the cylinder 3 again can automatically drive the required lifting rod 81 and the welding head 7 to move down.

[0057] A spot welding process for a spot welding device for lithium battery manufacturing comprises the following steps:

[0058] 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 an electric welding head 7 above each lithium battery;

[0059] S2: Start the vacuum pump 2, which draws gas into the gas storage chamber 82, so that the gas is discharged from the guide groove 83 and the gas outlet 84 to the lower side of the lifting frame 5, so that the gas can be sprayed downward to the battery pack 4, and the gas can make the debris fall off before spot welding;

[0060] 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, which can accelerate the falling of the lifting rod 81, and then perform spot welding;

[0061] S4: After the spot welding is completed, the vacuum pump 2 is turned off first, the lifting frame 5 is moved upward by the cylinder 3, and then the vacuum pump 2 is started again to allow gas to be ejected from the air outlet 84, which can accelerate the cooling of the spot welding area.

[0062] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in 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 pump (2) fixed to the side wall of the base (1), wherein the upper end of the air pump (2) is fixedly connected to a cylinder (3), the lower end of the cylinder (3) is fixedly connected to a connecting rod (9), the lower end of the connecting rod (9) is fixedly connected to a lifting frame (5), the lower side of the lifting frame (5) is located on the base (1) and a battery pack (4) is placed, a conduit (6) is connected between the air pump (2) and the lifting frame (5), and the device is characterized in that: Also includes: An air blowing mechanism (8) is capable of blowing away debris and dissipating 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 to an electric welding head (7). The lifting rod (81) is movably arranged in the lifting frame (5). The lower end of the electric welding head (7) extends to the lower side of the lifting frame (5). An air storage chamber (82) is provided on one side of the lifting rod (81) in the lifting frame (5). A guide groove (83) is provided in the lifting rod (81). An air outlet (84) is provided at the bottom end of the lifting rod (81). The air storage chamber (82), the guide groove (83) and the air outlet (84) are connected. The automatic identification mechanism (10) can automatically identify whether there is a battery below. The automatic identification mechanism (10) is set in the blowing mechanism (8). The automatic identification mechanism (10) includes a fixed ring (101) fixed in the lifting rod (81). The upper end of the lifting frame (5) is located on one side of the lifting rod (81) and is provided with a magnetic rod (102) for horizontal sliding. The lower end of the magnetic rod (102) and the lifting frame (5) are fixed with a spring (103). The lower surface of the upper end of the base (1) is fixed with a magnetic block (109). The magnetic block (109) 109) is located on a side of the magnetic rod (102) away from the lifting rod (81), the top of the lifting rod (81) is fixedly connected to a magnetic block 1 (104), one side of the magnetic block 1 (104) is in contact with a magnetic block 2 (105), the magnetic block 2 (105) is fixed in the base (1), and a magnetic block 3 (106) is fixed in the base (1) on the upper side of the lifting rod (81), the bottom end of the fixing ring (101) is provided with an inclined sliding surface (107), and the outer walls of the lifting rod (81) and the fixing ring (101) are provided with a sliding groove (108); And an acceleration mechanism (11) capable of accelerating the downward movement of the electric welding head (7), wherein the acceleration mechanism (11) is arranged in the blowing mechanism (8).

2. A spot welding device for lithium battery manufacturing according to claim 1, characterized in that: The acceleration mechanism (11) includes a conical groove (111), the conical groove (111) is opened in the middle of the lifting rod (81), and the inner walls on both opposite sides of the upper part of the slide groove (108) are both provided with limiting grooves (112), and the two opposite outer walls of the end of the magnetic rod (102) close to the lifting rod (81) are both provided with limiting columns (113), and the end of the limiting column (113) located inside the magnetic rod (102) is fixedly connected to the magnetic rod (102) with a spring 2 (114), and the end of the limiting column (113) extending to the outside of the magnetic rod (102) is provided with inclined surfaces (115) on both opposite sides, and the upper end of the lifting rod (81) is provided with a slot hole (116), and the slot hole (116) is connected to the inner cavity of the conical groove (111).

3. A spot welding device for lithium battery manufacturing according to claim 2, characterized in that: A plurality of lifting rods (81) are arranged at equal intervals along the length and width of the lifting frame (5).

4. A spot welding device for lithium battery manufacturing according to claim 3, characterized in that: Each of the air storage chambers (82) is connected to the air pump (2).

5. A spot welding device for lithium battery manufacturing according to claim 4, characterized in that: The inclined sliding surface (107) is opened at an angle of 180 degrees.

6. A spot welding device for lithium battery manufacturing according to claim 5, characterized in that: When the second magnetic block (105) is adsorbed with the first magnetic block (104), the magnetic rod (102) corresponds to the outer wall of the fixed ring (101) that does not have the inclined sliding surface (107); when the third magnetic block (106) is adsorbed with the first magnetic block (104), the magnetic rod (102) corresponds to the inclined sliding surface (107).

7. A spot welding process for a spot welding device for lithium battery manufacturing, based on the spot welding device for lithium battery manufacturing according to claim 6, characterized in that: The following steps are involved: 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 an electric welding head (7) above each lithium battery; S2: Start the vacuum pump (2), which draws gas into the gas storage chamber (82), so that the gas is discharged from the guide groove (83) and the gas outlet (84) to the lower side of the lifting frame (5), so that the gas can be sprayed downward to the battery pack (4), and the gas can cause debris to fall before spot welding; S3: Start the air cylinder (3), move the lifting frame (5) downward through the connecting rod (9), and the gas pushes the lifting rod (81) downward, which can accelerate the falling of the lifting rod (81), and then perform spot welding; S4: When the spot welding is completed, the vacuum pump (2) is first turned off, the lifting frame (5) is moved upward by the cylinder (3), and then the vacuum pump (2) is started again, so that the gas is ejected from the gas outlet (84), which can accelerate the cooling of the spot welding area.

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