A welding device for lead-acid battery busbars

Abstract

A welding device for lead-acid battery busbars includes a gas welding torch, a welding box, comb plates, pressure bars, a lower temperature sensor, and a welding controller. The welding box holds the electrode group, and the pressure bars are placed between the tabs of the positive and negative plates. Two comb plates are symmetrically placed on either side of the pressure bars. Each comb plate has comb teeth, and the upper surface of the comb plate is recessed to form welding grooves corresponding to the tabs. Cooling air channels are provided inside the comb plates, and these channels are connected to a high-pressure air source via cooling ducts. A cold air solenoid valve connected to the welding controller is installed on the cooling ducts. The lower temperature sensor is installed at the bottom of the comb teeth and connected to the welding controller. The flameout controller of the gas welding torch is connected to the welding controller. This invention utilizes a temperature sensor to monitor the welding temperature of the busbar. If the temperature exceeds the limit, the gas welding torch flame is extinguished, and the comb plates are simultaneously cooled through the cooling air channels. This allows for precise control of the welding temperature, improving the corrosion resistance of the busbar and extending the battery's float life.

Description

Technical Field

[0001] This utility model relates to a welding device for lead-acid battery busbars, belonging to the field of battery technology. Background Technology

[0002] Valve-regulated lead-acid (VRLA) batteries for telecommunications are mainly used in large data centers of mobile, China Unicom, and China Telecom. They are primarily used in float charging backup mode, providing power in the event of a mains power outage or accident. Therefore, VRLA batteries for telecommunications operate in a float charging state for extended periods. They are widely used due to their low cost, maintenance-free operation, and long float charging life. However, in recent years, with major operators increasing their battery warranty requirements, extending the float charging life has become a priority. Currently, the design of these batteries mainly considers whether the corrosion growth of the positive grid (when the positive plate is at a high potential, the alloy undergoes an oxidation reaction, forming compounds. This process is called corrosion, and the increase in the volume of alloy components accompanied by corrosion is collectively called corrosion growth) can meet the lifespan requirements. However, in actual use, it is sometimes found that it is not the corrosion of the positive grid that affects the float charging life, but rather the corrosion of the busbar that prematurely ends the float charging life of the VRLA battery. This presents a new challenge: how to improve the corrosion resistance of the busbars in communication-grade VRLA batteries.

[0003] Valve-regulated sealed lead-acid batteries are designed with a low electrolyte concentration. The busbar and terminals are located in the upper part of the battery. The atmosphere in this upper space changes with the duration of float charging. Initially, it is a strongly acidic environment. As oxygen recombination efficiency improves, acid mist production decreases, and the rising sulfuric acid is consumed by the corrosion of the busbar. The upper space gradually becomes neutral and then weakly alkaline. In this alkaline environment, the lead in the busbar corrodes, with the corrosion products mainly being PbO·PbSO4. Due to the loose structure and weak alkalinity of PbO·PbSO4, further corrosion of the busbar matrix is ​​aggravated. If the busbar alloy has a coarse-grained structure, according to the theory of intergranular corrosion, corrosion will proceed rapidly along the grain boundaries into the depth of the busbar, quickly causing the busbar structure to disintegrate and ultimately leading to battery failure.

[0004] Currently, battery busbar welding parameters are controlled by the operator's welding experience. Patent document CN103264153A, entitled "A Welding Method for Lead-Acid Battery Busbars," discloses a technical solution including the following steps: fixing the tabs of the battery's isotropic plates in a fixture; injecting a measured amount of solder paste into a casting mold cavity; immersing the tabs in the solder paste; rapidly heating the casting mold cavity until the solder melts; rapidly cooling the casting mold cavity for a certain time to allow the solder to form a busbar bonded to the tabs, then removing the tabs; continuing to cool the casting mold cavity to 60-80 degrees Celsius before proceeding to the next set of operations. This invention uses a casting-welding method to form the lead-acid battery busbar and rapidly cools it to shape. The busbar is demolded and removed while the casting mold cavity temperature is still high, thus ensuring welding quality, reducing solder volatilization at high temperatures, saving solder usage, and lowering production costs. However, due to differences in operator skill levels, localized overheating during welding can cause some alloy components to burn off. Differences in the alloy's metallographic structure can lead to severe Sn segregation, causing Sn to accumulate at the grain boundaries. Differences in the chemical composition of the busbar alloy grain boundaries and grains can form corrosion cells in the sulfuric acid electrolyte. Furthermore, excessively high welding temperatures during busbar welding can cause grain growth and exacerbate intergranular corrosion. Moreover, excessively high welding temperatures can lead to over-welding of the bottom tabs, easily resulting in board detachment. On the other hand, disassembling the welding fixture during busbar solidification can cause the later-solidified portion to have coarser grains than the earlier-solidified portion, leading to severe intergranular corrosion during battery use and premature battery failure. Since coarse busbar grains cannot be eliminated after welding, and premature battery failure due to coarse grains is a frequent occurrence, effectively preventing coarse busbar grains has become a challenge for relevant technicians. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a welding device for lead-acid battery busbars, thereby improving the corrosion resistance of the busbars and extending the float charge life of the batteries.

[0006] The problem described in this utility model is solved by the following technical solution:

[0007] A welding device for a lead-acid battery busbar includes a gas welding torch, a welding box, two comb plates, a pressure bar, a lower temperature sensor, and a welding controller. The welding box houses the electrode group of the lead-acid battery. The pressure bar is placed between the tabs of the positive and negative plates of the electrode group. The two comb plates are symmetrically placed on both sides of the pressure bar and are in close contact with it. Each comb plate has comb teeth at a location corresponding to the tab, with the tab inserted into the gap between the comb teeth. The upper surface of the comb plate is recessed at a location corresponding to the tab, forming a welding groove with the tab and the pressure bar. A cooling air passage is provided inside the comb plate, connected to a high-pressure air source via a cooling duct. A cold air solenoid valve connected to the welding controller is installed on the cooling duct. The lower temperature sensor is installed at the bottom of the comb teeth and connected to the welding controller. The flameout controller of the gas welding torch is connected to the welding controller.

[0008] The welding device for the lead-acid battery busbar described above has an upper temperature sensor installed on the comb plate. The upper temperature sensor is embedded in the top of the comb plate and located on the side of the welding groove. The signal output terminal of the upper temperature sensor is connected to the welding controller.

[0009] The aforementioned welding device for lead-acid battery busbars includes a positioning hole on the comb plate and a comb plate positioning mechanism at the end of the welding outer casing. The comb plate positioning mechanism includes a positioning rod and an electric telescopic rod. The electric telescopic rod is vertically fixed to the outer wall of the welding outer casing by a bracket. The control end of the electric telescopic rod is connected to the welding controller. The lower end of the positioning rod is connected to the telescopic end of the electric telescopic rod, and the upper end passes through the through hole on the horizontal flange at the upper end of the side wall of the welding outer casing and corresponds to the positioning hole on the comb plate.

[0010] The welding device for the lead-acid battery busbar described above has a welding box fixed inside the welding outer box. Both ends of the welding outer box are provided with horizontal slides perpendicular to the pressure strip, and both ends of each comb plate are slidably connected to the slides.

[0011] The aforementioned welding device for lead-acid battery busbars has a movable side plate on one side of the welding box that is parallel to the positive and negative plates in the electrode group. An electrode group thickness adjustment device corresponding to the movable side plate is installed on the welding outer box. The electrode group thickness adjustment device includes a horizontal push rod and an adjusting cylinder. The adjusting cylinder is fixed on the side wall of the welding outer box. One end of the horizontal push rod is coaxially connected to the piston rod of the adjusting cylinder, and the other end is perpendicularly connected to the middle of the movable side plate.

[0012] The welding device for the lead-acid battery busbar mentioned above includes a cooling air passage in the comb plate, which includes a longitudinal air passage perpendicular to the electrode plate and a transverse air passage parallel to the comb teeth. The longitudinal and transverse air passages are interconnected, and one end of the longitudinal air passage is connected to a cooling duct. Each electrode tab has a transverse air passage on both sides, and a transverse air passage is provided at the center of each comb tooth. Multiple downward-facing ventilation holes are provided on both the longitudinal and transverse air passages.

[0013] The welding device for the lead-acid battery busbar described above has a horizontal slide rail in the shape of an angle steel. Its vertical plate is fixedly connected to the horizontal flange at the upper end of the welding outer casing side wall by fixing screws. A sliding groove matching the end of the comb plate is formed between the top horizontal plate and the horizontal flange at the upper end of the welding outer casing side wall. A connecting pipe is provided in the through hole on the vertical plate of the horizontal slide rail. One end of the connecting pipe is connected to the cooling air duct, and the other end is opposite to the air inlet of the cooling air passage in the comb plate.

[0014] The welding device for the lead-acid battery busbar described above has a cooling air passage with a diameter of 1 / 3 of the comb plate thickness; the longitudinal air passage is 5-10 mm away from the busbar; the vent hole spacing is 10 mm and the hole diameter is 1 mm. Beneficial effects

[0015] This invention utilizes a temperature sensor to monitor the welding temperature of the busbar. If the temperature exceeds the limit, the gas welding torch flame is activated, and the comb plate is cooled through the cooling air channel. This allows for precise control of the welding temperature, improves the corrosion resistance of the busbar, prevents corrosion and breakage, and extends the float life of the battery. Attached Figure Description

[0016] The present invention will now be described in further detail with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 yes Figure 1 The left view;

[0019] Figure 3 yes Figure 1 Top view;

[0020] Figure 4 This is a structural diagram of the comb plate and pressure strip;

[0021] Figure 5 yes Figure 4 AA section view;

[0022] Figure 6 yes Figure 4 A magnified view of a section at point I;

[0023] Figure 7 This is a structural schematic diagram of the welding box;

[0024] Figure 8 yes Figure 7 The left view;

[0025] Figure 9 yes Figure 7 Top view.

[0026] The following are the labels in the diagram: 1. Welding box, 2. Welding outer box, 3. Electrode group, 4. Slide rail, 5. Fixing screw, 6. Comb plate, 7. Pressure strip, 8. Lower temperature sensor, 9. Movable baffle, 10. Upper temperature sensor, 11. Cooling air duct, 12. Connecting pipe, 13. Horizontal push rod, 14. Adjusting cylinder, 15. Cooling air duct, 16. Positioning rod, 17. Electric telescopic rod, 18. Electrode column, 19. Electrode lug, 20. Comb teeth, 21. Welding groove, 22. Movable side plate, 23. Longitudinal beam, 24. Welding controller, 25. Gas solenoid valve, 26. Cold air solenoid valve, 27. Oxygen solenoid valve. Detailed Implementation

[0027] This invention addresses the problems existing in the prior art by providing a welding device for lead-acid battery busbars. The device has a temperature sensor installed on the comb plate and a cooling air channel opened. The cooling air channel is connected to a cooling duct, thereby enabling precise control of the welding temperature and achieving welding of highly corrosion-resistant busbars.

[0028] See Figures 1-3 This utility model includes a welding box 1, a welding outer box 2, two comb plates 6, a pressure bar 7, a lower temperature sensor 8, an upper temperature sensor 10, a cooling air duct 15, a welding controller 24, a cooling air duct 15, and a gas welding torch (not shown in the figure).

[0029] During welding, electrode group 3 is placed into welding box 1, and welding box 1 containing electrode group 3 is placed into welding outer box 2 and fixed. The positions of electrode tabs 19 on the positive and negative electrode plates are adjusted, and pressure strip 7 is placed between electrode tabs 19 on the positive and negative electrode plates. Both ends of welding outer box 2 are provided with horizontal slide rails 4 perpendicular to pressure strip 7. Two comb plates 6 are located on both sides of pressure strip 7, and the two ends of each comb plate 6 are slidably connected to the slide rails 4. When the two comb plates 6 slide towards each other and close with pressure strip 7, two electrode tabs 19 on the positive electrode plate and two electrode tabs 19 on the negative electrode plate are inserted respectively. In the gap between the comb teeth 20 of the comb plate 6, the upper surface of the comb plate 6 is recessed in corresponding parts to the electrode tab 19. The comb plate 6, the electrode tab 19 and the pressure strip 7 form a welding groove 21. The electrode post 18 is placed in the designated position in the welding groove 21. The operator melts the welding rod with a gas welding gun. The molten lead flows into the welding groove 21. At the same time, the flame of the welding gun also melts the base of the electrode tab 19 and the electrode post 18, which are integrated with the molten lead of the welding rod. After the lead cools, it forms a busbar, connecting the electrode tab 19 and the electrode post 18 together.

[0030] A lower temperature sensor 8 is installed at the bottom of the comb teeth 20 of the comb plate 6, close to the electrode tab 19 of the electrode plate. The signal output terminal of the lower temperature sensor 8 is connected to the welding controller 24. A gas solenoid valve 25 is installed on the gas pipeline of the gas welding torch, and an oxygen solenoid valve 27 is installed on the oxygen pipeline. The gas solenoid valve 25 and the oxygen solenoid valve 27 constitute the flameout controller of the gas welding torch, and their control terminals are connected to the welding controller 24. The welding controller 24 uses a PLC module to control the flameout controller and send alarm information. When the temperature value measured by the lower temperature sensor 8 is higher than the set upper limit of the welding temperature, the welding controller 24 sends an alarm information and closes the gas solenoid valve 25 and the oxygen solenoid valve 27, extinguishing the flame of the gas welding torch, stopping heating, and preventing over-welding of the electrode tab 19.

[0031] See Figures 1-6 The comb plate 6 is equipped with a cooling air passage 11, which is connected to a high-pressure air source via a cooling air duct 15. A cold air solenoid valve 26, connected to the welding controller 24, is installed on the cooling air duct 15. When the temperature measured by the current temperature sensor 8 exceeds the set upper limit of the welding temperature, the welding controller 24 opens the cold air solenoid valve 26 to cool the comb plate 6. Extensive experimental results indicate that a welding temperature not exceeding 460℃ is preferable; therefore, the upper limit of the welding temperature is set to 460℃.

[0032] See Figures 4-6 The cooling air passage 11 in the comb plate 6 includes a longitudinal air passage perpendicular to the electrode plate and a transverse air passage parallel to the comb teeth, and the longitudinal and transverse air passages are interconnected. The diameter of the cooling air passage 11 is 1 / 3 of the thickness of the comb plate 6. The longitudinal air passage is 5-10 mm away from the manifold. The cooling air passage 11 has multiple downward-facing vent holes with a hole spacing of 10 mm and a hole diameter of 1 mm. One end of the longitudinal air passage is connected to the cooling air duct 15. Each electrode tab 19 has transverse air passages on both sides, and each comb tooth 20 has a transverse air passage at its center. The spacing of the transverse air passages is consistent with the center distance of the positive electrode plate (or negative electrode plate) in the electrode group 3. The number of transverse air passages on each comb plate 6 is at least the number of comb teeth 20 plus 2.

[0033] See Figures 1-3The comb plate 6 has positioning holes, and the end of the welding outer casing 2 is equipped with a comb plate positioning mechanism. The comb plate positioning mechanism includes a positioning rod 16 and an electric telescopic rod 17. The electric telescopic rod 17 is vertically fixed to the outer wall of the welding outer casing 2 by a bracket. The lower end of the positioning rod 16 is connected to the telescopic end of the electric telescopic rod 17, and the upper end passes through the through hole on the horizontal flange at the upper end of the side wall of the welding outer casing 2 and corresponds to the positioning hole on the comb plate 6. The control end of the electric telescopic rod 17 is connected to the welding controller 24. During busbar welding, the positioning rod 16 is inserted into the positioning hole on the comb plate 6 to lock the comb plate 6 and prevent the comb plate 6 from moving during the welding process. A temperature sensor 10 is embedded on the top of the comb plate 6, close to the busbar. The signal output terminal of the temperature sensor 10 is connected to the welding controller 24. When the temperature value measured by the temperature sensor 10 is higher than the set demolding temperature, the welding controller 24 controls the comb plate positioning mechanism to lock the comb plate 6. When the temperature of the comb plate drops to the set demolding temperature, the welding controller 24 controls the comb plate positioning mechanism to unlock the comb plate 6 (the positioning rod 16 is pulled out from the positioning hole on the comb plate 6), allowing the comb plate 6 to be removed. According to verification, the busbar completely solidifies when the bottom temperature reaches below 300℃. Therefore, setting the demolding temperature to 300℃ ensures that the busbar completely solidifies during demolding, preventing coarse grains in the busbar.

[0034] The horizontal slide rail 4 is shaped like an angle steel, and its upright plate is fixedly connected to the horizontal flange at the upper end of the side wall of the welded outer casing 2 by fixing screws 5. The top horizontal plate and the horizontal flange at the upper end of the side wall of the welded outer casing 2 form a sliding groove that matches the end of the comb plate 6, and the comb plate 6 can slide freely along the sliding groove. A connecting pipe 12 is provided in the through hole on the upright plate of the horizontal slide rail 4. One end of the connecting pipe 12 is connected to the cooling air duct 15, and the other end is opposite to the air inlet of the cooling air passage 11 in the comb plate 6.

[0035] See Figure 1 , Figures 7-9 The bottom plate of welding box 1 is composed of multiple longitudinal beams 23 perpendicular to the positive and negative plates in electrode group 3. The multiple longitudinal beams 23 are arranged at equal intervals, with gaps between adjacent longitudinal beams 23. The gaps can accommodate lead beads and lead slag to prevent short circuits caused by falling lead beads and lead slag at the bottom of electrode group 3. The longitudinal beams 23 are made of round tubes, and slag discharge ports can be opened at the lower end of the side wall of welding box 1 to discharge lead beads and lead slag.

[0036] The welding box 1 can contain a single pole group, or two or more pole groups 3; a movable baffle 9 is provided between two adjacent pole groups 3.

[0037] A side plate of the welding box 1 that is parallel to the positive and negative plates in the electrode group 3 is a movable side plate 22. An electrode group thickness adjustment device corresponding to the movable side plate 22 is installed on the welding outer box 2. The electrode group thickness adjustment device includes a horizontal push rod 13 and an adjusting cylinder 14. The adjusting cylinder 14 is fixed on the side wall of the welding outer box 2. One end of the horizontal push rod 13 is coaxially connected to the piston rod of the adjusting cylinder 14, and the other end is vertically connected to the middle of the movable side plate 22.

[0038] The welding steps of this utility model are as follows:

[0039] a. Place electrode group 3 into welding box 1, adjust the position of electrode tab 19 on the positive and negative electrode plates of electrode group 3, and place pressure strip 7 between electrode tab 19 on the positive and negative electrode plates;

[0040] b. Start the adjusting cylinder 14. The adjusting cylinder 14 drives the movable side plate 22 to move through the horizontal push rod 13, and adjusts the thickness of the pole group 3 to the set value.

[0041] c. Slide the two comb plates 6 toward each other until they are closed with the pressure strip 7. Insert the electrode tabs 19 on the positive electrode plate and the electrode tabs 19 on the negative electrode plate into the gaps between the comb teeth 20 of the two comb plates 6 respectively. Place the electrode post 18 in the designated position in the welding groove 21 and control the comb plate positioning mechanism to lock the comb plate 6.

[0042] d. The operator melts the welding rod with a gas welding torch. The molten lead flows into the welding tank 21. At the same time, the flame of the welding torch melts the base of the electrode tab 19 and the electrode post 18, which merge with the molten lead of the welding rod to form a busbar.

[0043] e. When the temperature value measured by the current temperature sensor 8 is greater than the set upper limit of the welding temperature, the welding controller 24 uses the flameout controller to extinguish the flame of the gas welding torch, stop heating, prevent the electrode tab 19 from over-welding, and at the same time open the cold air solenoid valve 26 to cool the comb plate 6.

[0044] f. After welding is completed, if the temperature value measured by the upper temperature sensor 10 is greater than the set demolding temperature, the welding controller 24 controls the comb plate positioning mechanism to lock the comb plate 6; when the temperature value measured by the upper temperature sensor 10 drops to the set demolding temperature, the welding controller 24 controls the comb plate positioning mechanism to unlock the comb plate 6.

[0045] g. After the comb plate positioning mechanism unlocks the comb plate 6, it opens the comb plate 6, removes the pressure bar 7, adjusts the piston rod of the cylinder 14 to retract, removes the electrode group 3, and completes the welding of the busbar.

[0046] Results after implementation:

[0047] According to section 7.23.2 of the national standard YD / T799-2010 for valve-regulated sealed lead-acid batteries for communication applications, the battery busbar was observed after the discharge test. The observation results are shown in the table below.

[0048] Unit Number Unit 1 Unit 2 Unit 3 Unit 4 Unit 5 Unit 6 Unit 7 8 units Unit 9 Overheated welding bus intact intact intact intact Corrosion fracture Application of this utility model of welding busbar intact intact intact intact intact intact intact intact intact

[0049] Therefore, this invention can effectively improve the welding quality of the busbar, prevent corrosion and breakage, and extend the float life of the battery.

Claims

1. A welding device for lead-acid battery busbars, characterized in that, The welding assembly includes a gas welding torch, a welding box (1), a welding outer box (2), two comb plates (6), a pressure bar (7), a lower temperature sensor (8), and a welding controller (24). The welding box (1) contains the electrode group (3) of a lead-acid battery. The pressure bar (7) is placed between the tabs (19) of the positive and negative plates of the electrode group (3). The two comb plates (6) are symmetrically placed on both sides of the pressure bar (7) and are in close contact with the pressure bar (7). Each comb plate (6) has comb teeth (20) at the part corresponding to the tab (19). The tabs (19) are inserted into the gaps between the comb teeth (20). The upper surface of (6) is recessed at the part corresponding to the tab (19) and forms a welding groove (21) with the tab (19) and the pressure strip (7). A cooling air passage (11) is provided inside the comb plate (6). The cooling air passage (11) is connected to the high-pressure air source through the cooling air pipe (15). A cold air solenoid valve (26) connected to the welding controller (24) is installed on the cooling air pipe (15). The lower temperature sensor (8) is installed at the bottom of the comb tooth (20) and connected to the welding controller (24). The flameout controller of the gas welding torch is connected to the welding controller (24).

2. A device for welding the busbars of a lead-acid battery according to claim 1, characterized in that The comb plate (6) is provided with an upper temperature sensor (10), which is embedded in the top of the comb plate (6) and located on the side of the welding groove (21). The signal output end of the upper temperature sensor (10) is connected to the welding controller (24).

3. A device for welding the busbars of a lead-acid battery according to claim 2, characterized in that The comb plate (6) is provided with positioning holes, and the end of the welding outer box (2) is provided with a comb plate positioning mechanism. The comb plate positioning mechanism includes a positioning rod (16) and an electric telescopic rod (17). The electric telescopic rod (17) is vertically fixed on the outer wall of the welding outer box (2) by a bracket. The control end of the electric telescopic rod (17) is connected to the welding controller (24). The lower end of the positioning rod (16) is connected to the telescopic end of the electric telescopic rod (17), and the upper end passes through the through hole on the horizontal flange at the upper end of the side wall of the welding outer box (2) and corresponds to the positioning hole on the comb plate (6).

4. A device for welding the busbars of a lead-acid battery according to claim 3, characterized in that The welding box (1) is fixed inside the welding outer box (2). Both ends of the welding outer box (2) are provided with horizontal slides (4) perpendicular to the pressure strip (7). Both ends of each comb plate (6) are slidably connected to the slides (4).

5. A device for welding the busbars of a lead-acid battery according to claim 4, characterized in that One of the side plates of the welding box (1) parallel to the positive and negative plates in the electrode group (3) is a movable side plate (22). An electrode group thickness adjustment device corresponding to the movable side plate (22) is installed on the welding outer box (2). The electrode group thickness adjustment device includes a horizontal push rod (13) and an adjusting cylinder (14). The adjusting cylinder (14) is fixed on the side wall of the welding outer box (2). One end of the horizontal push rod (13) is coaxially connected to the piston rod of the adjusting cylinder (14), and the other end is vertically connected to the middle of the movable side plate (22).

6. A device for welding the busbars of a lead-acid battery according to claim 5, characterized in that The cooling air passage (11) in the comb plate (6) includes a longitudinal air passage perpendicular to the electrode plate and a transverse air passage parallel to the comb teeth (20), and the longitudinal air passage and the transverse air passage are interconnected. One end of the longitudinal air passage is connected to the cooling air duct (15). Each electrode ear (19) has a transverse air passage on both sides, and a transverse air passage is set at the center of each comb tooth (20). Multiple downward-facing ventilation holes are opened on both the longitudinal air passage and the transverse air passage.

7. A device for welding the busbars of a lead-acid battery according to claim 6, characterized in that The horizontal slide (4) is in the shape of angle steel. Its upright plate is fixedly connected to the horizontal flange at the upper end of the side wall of the welded outer box (2) by fixing screws (5). The top horizontal plate and the horizontal flange at the upper end of the side wall of the welded outer box (2) form a sliding groove that matches the end of the comb plate (6). A connecting pipe (12) is provided in the through hole on the upright plate of the horizontal slide (4). One end of the connecting pipe (12) is connected to the cooling air pipe (15), and the other end is opposite to the air inlet of the cooling air passage (11) in the comb plate (6).

8. A device for welding the busbars of a lead-acid battery according to claim 7, characterized in that The diameter of the cooling air passage (11) is 1 / 3 of the thickness of the comb plate (6); the longitudinal air passage is 5-10 mm away from the manifold, the hole spacing of the vent is 10 mm, and the hole diameter is 1 mm.

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