Welding device and welding method for photovoltaic cell

Abstract

The invention discloses a welding device and a welding method for a photovoltaic cell, and relates to the field of welding equipment. The welding device for the photovoltaic cell comprises a welding platform, a mounting frame is fixedly mounted on the welding platform, the welding device further comprises sleeves arranged at the two ends of the mounting frame, piston discs are connected into the sleeves in a sliding mode, and connecting rods are fixedly connected to the piston discs; according to the battery piece welding device, battery pieces of different specifications and sizes can be clamped and fixed, the situation that the battery pieces are damaged due to the fact that the pressure applied to the battery pieces is too large can be prevented, and dust particles attached to the surfaces of the battery pieces can be cleaned through cooperation of a dust collection cover and a dust collection pump during welding, so that the surfaces of the battery pieces are kept clean, and the welding quality is improved. And high-pressure gas exhausted by the pressure relief pipe enters a hollow cavity of the dust collection cover, is obliquely and downwards sprayed out through the gas spraying holes and is matched with the negative pressure of the dust collection pump, the surface cleaning effect of the battery piece is further improved, it is ensured that the welding area is clean, and the welding quality is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of welding equipment, and specifically relates to a welding device and a welding method for photovoltaic cells. Background Art

[0002] In order to save non-renewable energy, the utilization of renewable energy such as solar energy and wind energy is increasing. When using solar energy, as the core component, the production and manufacturing of photovoltaic cells have attracted more and more attention. Photovoltaic cells are formed by string welding a large number of cell wafers, and the welding quality of the cell wafers directly affects the performance and service life of the photovoltaic cells.

[0003] During the welding process, it is usually necessary to first arrange the cell wafers, then place the welding tape between adjacent cell wafers, and then use a welding device to iron the welding tape so that the welding tape is welded between the cell wafers, thereby string-welding the cell wafers into a photovoltaic panel. This process requires the welding device to accurately position and clamp the cell wafers to ensure the stability of the welding process;

[0004] However, for existing welding equipment, it is necessary to manually operate the clamping mechanism to clamp and fix the cell wafers. However, it is difficult to control the pressing force applied by the manual operation of the clamping mechanism to the cell wafers. If the clamping force applied is too large, it is easy to damage the cell wafers. If the clamping force applied is too small, the clamping effect on the cell wafers will be affected. In view of this, the present invention is specifically proposed. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a welding device and a welding method for photovoltaic cells that can overcome or at least partially solve the above problems.

[0006] To solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0007] A welding device for photovoltaic cells includes a welding platform, on which an installation frame is fixedly installed, and further includes: sleeves provided at both ends of the installation frame, wherein a piston disk is slidably connected in the sleeve, a connecting rod is fixedly connected to the piston disk, and a pressing plate is fixedly connected to one end of the connecting rod passing through the sleeve; a spring, one end of which is fixedly connected to the inner wall of the top of the sleeve, and the other end of which is fixedly connected to the piston disk; a booster pump fixedly installed on the welding platform; an air delivery pipe, one end of which is communicated with the output end of the booster pump, and the other end of which is communicated with the sleeve; a pressure relief pipe communicated with the sleeve; a moving seat slidably connected to the welding platform; and an electric welding gun connected to the moving seat in a lifting manner.

[0008] Preferably, in order to control the lifting of the electric welding gun, an installation seat is connected to the moving seat, and a cylinder is fixedly installed on the installation seat, and the electric welding gun is fixedly connected to the telescopic end of the cylinder.

[0009] In order to adjust the position of the electric welding gun according to requirements, further, a hydraulic telescopic rod is fixedly installed on the moving seat, and the mounting seat is fixedly connected to the telescopic end of the hydraulic telescopic rod.

[0010] In order to further adjust the position of the electric welding gun according to requirements, furthermore, a lead screw is rotatably connected to the mounting frame, a guide groove is formed in the mounting frame, the moving seat is slidably connected in the guide groove and is threadedly connected to the lead screw, and a motor is fixedly installed on the mounting frame, and the lead screw is fixedly connected to the output end of the motor.

[0011] In order to clean the dust and particulate impurities attached to the battery chip before welding, furthermore, a dust collection hood is arranged on the telescopic end of the cylinder, a dust suction pump and a filter box are fixedly installed on the welding platform, the input end of the dust suction pump is communicated with the dust collection hood through a first dust conveying pipe, and the output end is communicated with the filter box through a second dust conveying pipe.

[0012] In order to be able to blow the dust and particulate impurities attached to the battery chip, which is beneficial to sucking the dust and particulate impurities into the filter box through the dust collection hood, furthermore, a hollow cavity is formed between the inner and outer walls of the dust collection hood, a plurality of air spray holes communicating with the hollow cavity are equidistantly arranged on both inner walls of the dust collection hood, the air spray holes are arranged obliquely downward, and one end of the pressure relief pipe far away from the sleeve is communicated with the hollow cavity.

[0013] In order to facilitate the cleaning or replacement of the activated carbon filter element, furthermore, the filter box includes a plurality of activated carbon filter elements and exhaust holes formed in the filter box, and the plurality of activated carbon filter elements are all inserted into the filter box.

[0014] In order to be able to adjust the distance between the two pressing plates according to requirements, preferably, electric telescopic rods are fixedly installed at both ends of the mounting frame, a connecting seat is fixedly connected to the telescopic end of the electric telescopic rod, and the sleeve is fixedly connected to the connecting seat.

[0015] In order to facilitate the discharge of the gas pressurized into the sleeve, so that when the gas is discharged, the piston disc can automatically reset under the elastic potential energy of the spring, preferably, an exhaust pipe is fixedly communicated with the air conveying pipe, and a solenoid valve is arranged on the exhaust pipe.

[0016] The welding method of a photovoltaic cell includes the following operation steps:

[0017] Step 1: Place the arranged battery chips on the welding platform and place welding tapes between adjacent battery chips;

[0018] Step 2: Start the booster pump. The gas enters the sleeve through the gas pipeline, pushing the piston disk to drive the pressure plate to move downward, clamping and fixing the battery slice and the welding tape.

[0019] Step 3: Start the cylinder to lower the electric welding gun to contact the welding tape, and keep a gap of 5 - 10 mm between the dust collection hood and the battery slice.

[0020] Step 4: Turn on the electric welding gun, and the motor drives the lead screw to drive the moving seat to move to complete the welding.

[0021] Step 5: During the welding process, start the dust suction pump to adsorb and clean the dust particles attached to the surface of the battery slice through the dust collection hood, and then transport them into the filter box for filtration.

[0022] Step 6: When the air pressure in the sleeve exceeds the set value, the pressure relief valve set on the pressure relief pipe opens, discharging the excess gas through the pressure relief pipe, and part of the gas enters the air injection holes and sprays out to assist in cleaning the dust particles attached to the surface of the battery slice.

[0023] Step 7: After the welding is completed, turn off the booster pump, open the exhaust pipe solenoid valve to exhaust, the spring pushes the piston disk to reset, driving the pressure plate to move upward, and then the welded photovoltaic panel can be taken off.

[0024] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0025] The present invention can not only clamp and fix battery slices of different specifications and sizes, but also prevent excessive pressure on the battery slices, causing damage to the battery slices. During welding, the dust collection hood cooperates with the dust suction pump to clean the dust particles attached to the surface of the battery slice, thereby keeping the surface of the battery slice clean, improving the welding quality. Moreover, the high-pressure gas discharged from the pressure relief pipe enters the cavity of the dust collection hood and sprays obliquely downward through the air injection holes, cooperating with the negative pressure of the dust suction pump to further improve the cleaning effect of the battery slice surface, ensuring that the welding area is clean and improving the welding quality. Description of the Drawings

[0026] Figure 1 is the structural schematic diagram of the present invention Figure 1 ;

[0027] Figure 2 is the structural schematic diagram of the present invention Figure 2 ;

[0028] Figure 3 is the internal structural schematic diagram of the sleeve of the present invention;

[0029] Figure 4 is the partial structural schematic diagram of the present invention;

[0030] Figure 5 is the cross-sectional view of the dust collection hood of the present invention;

[0031] Figure 6 It is a schematic structural diagram of the filter box of the present invention.

[0032] In the figure: 1, welding platform; 101, installation frame; 102, electric telescopic rod; 103, connecting seat; 2, sleeve; 201, piston disc; 202, connecting rod; 203, pressing plate; 204, spring; 205, booster pump; 206, gas transmission pipe; 207, pressure relief pipe; 208, exhaust pipe; 3, moving seat; 301, hydraulic telescopic rod; 302, mounting seat; 303, cylinder; 304, electric welding gun; 4, lead screw; 401, guide groove; 402, motor; 5, dust collection hood; 501, hollow cavity; 502, air injection hole; 6, dust suction pump; 601, dust transmission pipe I; 602, dust transmission pipe II; 7, filter box; 701, activated carbon filter element; 702, exhaust hole. Specific embodiments

[0033] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0034] Embodiment 1: Refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , a welding device for a photovoltaic cell, including a welding platform 1, an installation frame 101 is fixedly installed on the welding platform 1, and further includes: sleeves 2 provided at both ends of the installation frame 101, wherein a piston disc 201 is slidably connected in the sleeve 2, a connecting rod 202 is fixedly connected to the piston disc 201, and the connecting rod 202 penetrates through one end of the sleeve 2 and is fixedly connected to a pressing plate 203; a spring 204, one end of which is fixedly connected to the inner wall of the top of the sleeve 2, and the other end is fixedly connected to the piston disc 201; a booster pump 205, fixedly installed on the welding platform 1; a gas transmission pipe 206, one end of which is communicated with the output end of the booster pump 205, and the other end is communicated with the sleeve 2; a pressure relief pipe 207, communicated with the sleeve 2; a moving seat 3, slidably connected to the welding platform 1; an electric welding gun 304, connected to the moving seat 3 in a lifting manner.

[0035] An installation seat 302 is connected to the moving seat 3, a cylinder 303 is fixedly installed on the installation seat 302, and the electric welding gun 304 is fixedly connected to the telescopic end of the cylinder 303.

[0036] A lead screw 4 is rotatably connected to the mounting frame 101. A guide groove 401 is formed in the mounting frame 101. The moving seat 3 is slidably connected in the guide groove 401 and is threadedly connected to the lead screw 4. A motor 402 is fixedly installed on the mounting frame 101, and the lead screw 4 is fixedly connected to the output end of the motor 402.

[0037] A dust collection hood 5 is provided on the telescopic end of the cylinder 303. A dust suction pump 6 and a filter box 7 are fixedly installed on the welding platform 1. The input end of the dust suction pump 6 is communicated with the dust collection hood 5 through a first dust conveying pipe 601, and the output end is communicated with the filter box 7 through a second dust conveying pipe 602.

[0038] A hollow cavity 501 is formed between the inner and outer walls of the dust collection hood 5. A plurality of air injection holes 502 communicated with the hollow cavity 501 are equidistantly formed on both inner walls of the dust collection hood 5. The air injection holes 502 are arranged obliquely downward. One end of the pressure relief pipe 207 away from the sleeve 2 is communicated with the hollow cavity 501.

[0039] During use, first, the staff places the arranged battery cells on the welding platform 1. After placing the battery cells, the welding tape is placed on the arranged battery cells and is located between two adjacent battery cells. Subsequently, the booster pump 205 is started. After compressing and boosting the external gas, the booster pump 205 conveys the gas into the sleeve 2 through the air conveying pipe 206. At this time, the gas filled in the sleeve 2 pushes the piston disc 201 to drive the pressing plate 203 to move downward through the connecting rod 202 and compress the spring 204 until the pressing plate 203 abuts against the battery cell, realizing the clamping and fixing of the battery cell and the welding tape, and preventing the displacement of the battery cell or the welding tape during the welding process, which affects the welding quality.

[0040] Next, start the cylinder 303. The telescopic end of the cylinder 303 extends, pushing the electric welding gun 304 and the dust collection hood 5 to move downward synchronously, so that the electric welding gun 304 contacts the welding tape. A gap of 5-10 mm is maintained between the dust collection hood 5 and the surface of the battery cell. This can not only ensure sufficient contact between the electric welding gun 304 and the welding tape for reliable welding, but also enable the dust collection hood 5 to effectively clean the surface dust without touching the battery cell. Then, turn on the electric welding gun 304 and start the motor 402. The motor 402 drives the lead screw 4 to rotate. Since the moving seat 3 is threadedly connected to the lead screw 4 and slides in the guide groove 401, when the lead screw 4 rotates, the moving seat 3 drives the mounting seat 302, the electric welding gun 304 and the dust collection hood 5 to move forward synchronously under the limit guidance of the guide groove 401, so that the electric welding gun 304 irons the welding tape, welding the welding tape between the battery cells, thereby stringing the battery cells into a photovoltaic panel. At the same time, start the dust suction pump 6. The dust suction pump 6 creates a negative pressure in the dust collection hood 5. During the movement of the dust collection hood 5 with the electric welding gun 304, dust particles in front of the electric welding gun 304 can be adsorbed in time, ensuring the cleanliness of the battery cell surface and improving the welding quality. Then, the dust particles are successively transported into the filter box 7 through the first dust transport pipe 601 and the second dust transport pipe 602. The filtering structure in the filter box 7 intercepts and filters the dust, and the purified gas is discharged from the filter box 7;

[0041] During the welding process, when the booster pump 205 continuously pressurizes the sleeve 2, causing the internal air pressure to exceed the set value of the pressure relief valve on the pressure relief pipe 207, the pressure relief valve automatically opens, and the excess gas is discharged from the sleeve 2 through the pressure relief pipe 207. While keeping the internal pressure of the sleeve 2 constant, it ensures that the pressing force of the pressing plate 203 on the battery cell is always consistent. This not only improves the stability of the pressing plate 203 in clamping and fixing the battery cell, but also prevents damage to the battery cell due to excessive pressure. At the same time, the discharged high-pressure gas enters the hollow cavity 501 of the dust collection hood 5 and is sprayed obliquely downward through the air spray holes 502, enabling it to blow off the dust particles adhering to the surface of the battery cell. Combined with the negative pressure generated by the dust collection hood 5, it further improves the cleaning effect of the battery cell surface, ensures the cleanliness of the welding area, and thus improves the welding quality and production efficiency of the photovoltaic cell.

[0042] It should be added that both the pressure relief pipe 207 and the first dust transport pipe 601 are made of stretchable and shrinkable hoses. Therefore, the pressure relief pipe 207 and the first dust transport pipe 601 not only do not interfere with the movement of the moving seat 3, but also prevent interference with the movement and lifting of the dust collection hood 5 and the electric welding gun 304;

[0043] Check valves are provided on the gas transport pipe 206, the first dust transport pipe 601, and the second dust transport pipe 602.

[0044] Example 2: Refer to Figure 1 、 Figure 2, The welding device for photovoltaic cells is basically the same as that in Embodiment 1. Further, electric telescopic rods 102 are fixedly installed at both ends of the installation frame 101. A connecting seat 103 is fixedly connected to the telescopic end of the electric telescopic rod 102, and the sleeve 2 is fixedly connected to the connecting seat 103;

[0045] When welding photovoltaic cells of different sizes, the staff, according to the actual specifications of the photovoltaic cells, start the electric telescopic rods 102 at both ends of the installation frame 101 through the control system. After receiving the instruction, the telescopic ends of the electric telescopic rods 102 start to expand and contract, driving the connecting seat 103 fixedly connected thereto to move. Since the sleeve 2 is fixed on the connecting seat 103, when the connecting seat 103 moves, it drives the sleeve 2 to move synchronously, and the piston disk 201, the connecting rod 202 and the pressing plate 203 in the sleeve 2 also move accordingly, so as to realize the adjustment of the distance between the two pressing plates 203. Among them, the electric telescopic rod 102 has high-precision control ability and can accurately adjust the telescopic length, so that the distance between the pressing plates 203 is precisely matched with the size of the photovoltaic cell. Compared with manual adjustment, the electric telescopic rod 102 has fast and accurate automatic operation, improves the adjustment efficiency, avoids manual errors, ensures that the pressing plates 203 can stably clamp photovoltaic cells of different sizes, prevents the battery from being fixed insecurely or unevenly stressed locally due to improper distance between the pressing plates 203, thereby enhancing the adaptability of the device to photovoltaic cells of different specifications, expanding the application range, reducing the cost and time for replacing or adjusting equipment due to changes in battery specifications, and improving production efficiency.

[0046] Embodiment 3: Refer to Figure 1 、 Figure 2 , The welding device for photovoltaic cells is basically the same as that in Embodiment 1. Further, a hydraulic telescopic rod 301 is fixedly installed on the moving seat 3, and the mounting seat 302 is fixedly connected to the telescopic end of the hydraulic telescopic rod 301.

[0047] When it is necessary to adjust the position of the electric welding gun 304 in the horizontal direction, start the hydraulic telescopic rod 301. The telescopic end of the hydraulic telescopic rod 301 extends or retracts, driving the mounting seat 302 and the cylinder 303 and the electric welding gun 304 on the mounting seat 302 to move in the horizontal direction. Since the hydraulic telescopic rod 301 has the characteristics of large thrust and high-precision control, it can quickly and stably adjust the position of the electric welding gun 304. Compared with manual adjustment, it is more labor-saving, efficient and accurate. This design makes the position adjustment of the electric welding gun 304 in the horizontal direction more flexible and precise, can meet the complex welding requirements of photovoltaic cells, ensure the welding position is accurate, improve the welding quality and production efficiency. At the same time, it improves the automation degree of the device, reduces manual operation errors and labor intensity.

[0048] Embodiment 4: Refer to Figure 1 、 Figure 2 、 Figure 6, The welding device of the photovoltaic cell is basically the same as that of Embodiment 1. Further, the filter box 7 includes a plurality of activated carbon filters 701 and exhaust holes 702 opened on the filter box 7, and the plurality of activated carbon filters 701 are all inserted into the filter box 7.

[0049] During the welding process of the photovoltaic cell, the dust pump 6 transports the dust particles on the surface of the cell into the filter box 7. At this time, the dust particles float upward with the air in the filter box 7 and pass through the plurality of activated carbon filters 701 in sequence. Since the activated carbon has a developed pore structure and rich microporous tissues inside, these microporous tissues have a strong adsorption force field. When the gas contacts the activated carbon, the strong adsorption force field of the activated carbon micropores can adsorb the particulate matter in the air into the micropores, thus realizing the effective interception and adsorption of the particulate matter in the air and achieving the effect of purifying the gas. The purified air then continues to flow upward and finally discharges from the filter box 7 through the exhaust holes 702 opened on the filter box 7.

[0050] Embodiment 5: Refer to Figure 1 , Figure 3 , The welding device of the photovoltaic cell is basically the same as that of Embodiment 1. Further, an exhaust pipe 208 is fixedly communicated with the air delivery pipe 206, and a solenoid valve is arranged on the exhaust pipe 208;

[0051] After the welding is completed, first close the booster pump 205, and then open the solenoid valve on the exhaust pipe 208. At this time, the gas in the sleeve 2 is discharged through part of the air delivery pipe 206 and the exhaust pipe 208. When the gas discharges from the sleeve 2, the compressed spring 204 generates a thrust to push the piston disk 201 to move upward and reset. When the piston disk 201 moves upward, it can drive the pressing plate 203 to move upward synchronously and automatically reset through the connecting rod 202, releasing the clamping of the photovoltaic panel after welding. Then the staff can take the welded photovoltaic panel off the welding platform 1.

[0052] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention.

Claims

1. Welding device for photovoltaic cells, comprising a welding platform (1), on which an installation frame (101) is fixedly installed, characterized in that, It further includes: Sleeves (2) arranged at both ends of the installation frame (101), wherein a piston disc (201) is slidably connected inside the sleeves (2), a connecting rod (202) is fixedly connected to the piston disc (201), and one end of the connecting rod (202) passing through the sleeve (2) is fixedly connected to a pressing plate (203); A spring (204) with one end fixedly connected to the inner wall of the top of the sleeve (2) and the other end fixedly connected to the piston disc (201); A booster pump (205) fixedly installed on the welding platform (1); An air delivery pipe (206) with one end communicating with the output end of the booster pump (205) and the other end communicating with the sleeve (2); A pressure relief pipe (207) communicating with the sleeve (2); A moving seat (3) slidably connected to the welding platform (1); An electric welding gun (304) connected in a lifting manner to the moving seat (3).

2. The welding device for a photovoltaic cell according to claim 1, characterized in that An installation seat (302) is connected to the moving seat (3), a cylinder (303) is fixedly installed on the installation seat (302), and the electric welding gun (304) is fixedly connected to the telescopic end of the cylinder (303).

3. The welding device for a photovoltaic cell according to claim 2, wherein, A hydraulic telescopic rod (301) is fixedly installed on the moving seat (3), and the installation seat (302) is fixedly connected to the telescopic end of the hydraulic telescopic rod (301).

4. The welding device for a photovoltaic cell according to claim 3, wherein, A lead screw (4) is rotatably connected to the installation frame (101), a guide groove (401) is formed on the installation frame (101), the moving seat (3) is slidably connected in the guide groove (401) and is threadedly connected to the lead screw (4), and a motor (402) is fixedly installed on the installation frame (101), and the lead screw (4) is fixedly connected to the output end of the motor (402).

5. The welding device for a photovoltaic cell according to claim 3, characterized in that, A dust collection hood (5) is arranged on the telescopic end of the cylinder (303), a dust suction pump (6) and a filter box (7) are fixedly installed on the welding platform (1), the input end of the dust suction pump (6) is communicated with the dust collection hood (5) through a first dust delivery pipe (601), and the output end is communicated with the filter box (7) through a second dust delivery pipe (602).

6. The welding device for a photovoltaic cell according to claim 5, characterized in that, A hollow cavity (501) is formed between the inner and outer walls of the dust collection hood (5), a plurality of air injection holes (502) communicating with the hollow cavity (501) are equidistantly arranged on both inner walls of the dust collection hood (5), the air injection holes (502) are arranged obliquely downward, and one end of the pressure relief pipe (207) far from the sleeve (2) is communicated with the hollow cavity (501).

7. The welding device for a photovoltaic cell according to claim 5, characterized in that, The filter box (7) includes a plurality of activated carbon filters (701) and exhaust holes (702) formed on the filter box (7), and the plurality of activated carbon filters (701) are all inserted into the filter box (7).

8. The welding device for a photovoltaic cell according to claim 1, characterized in that, Electric telescopic rods (102) are fixedly installed at both ends of the installation frame (101), a connecting seat (103) is fixedly connected to the telescopic end of the electric telescopic rod (102), and the sleeve (2) is fixedly connected to the connecting seat (103).

9. The welding device for a photovoltaic cell according to claim 1, characterized in that, An exhaust pipe (208) is fixedly communicated with the air delivery pipe (206), and an electromagnetic valve is arranged on the exhaust pipe (208).

10. A welding method for a photovoltaic cell, which uses the welding device for a photovoltaic cell according to any one of claims 1-9, characterized in that, It includes the following operating steps: Step 1: Place the arranged solar cells on the welding platform (1), and place welding tapes between adjacent solar cells; Step 2: Start the booster pump (205), the gas enters the sleeve (2) through the gas pipeline (206), pushes the piston disc (201) to drive the pressure plate (203) to move downwards, and clamp and fix the solar cells and the welding tapes; Step 3: Start the cylinder (303), lower the electric welding gun (304) to contact the welding tape, and keep a gap of 5 - 10 mm between the dust hood (5) and the solar cells; Step 4: Turn on the electric welding gun (304), the motor (402) drives the lead screw (4) to drive the moving seat (3) to move to complete welding; Step 5: During the welding process, start the dust suction pump (6), adsorb and clean the dust particles attached to the surface of the solar cells through the dust hood (5), and then transport them into the filter box (7) for filtering; Step 6: When the air pressure in the sleeve (2) exceeds the set value, the pressure relief valve set on the pressure relief pipe (207) opens, discharges the excess gas through the pressure relief pipe (207), and part of the gas enters the air injection holes (502) and is ejected to assist in cleaning the dust particles attached to the surface of the solar cells; Step 7: After welding is completed, turn off the booster pump (205), open the solenoid valve of the exhaust pipe (208) to exhaust, the spring (204) pushes the piston disc (201) to reset, drives the pressure plate (203) to move upwards, and then the welded photovoltaic panel can be removed.

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