Welding device and method for busbar of lead-acid storage battery

Abstract

A welding device for a lead-acid storage battery busbar comprises a gas welding gun, a welding box, comb plates, a pressing strip, a lower temperature sensor and a welding controller, a pole group is placed in the welding box, the pressing strip is placed between tabs of a positive pole plate and a negative pole plate, the two comb plates are horizontally placed on the two sides of the pressing strip, each comb plate is provided with comb teeth, and the welding controller is connected with the welding box. The portion, corresponding to a tab, of the upper surface of the comb plate is sunken to form a welding groove, a cooling air channel is formed in the comb plate and connected with a high-pressure air source through a cooling air pipe, a cold air electromagnetic valve connected with a welding controller is installed on the cooling air pipe, and a lower temperature sensor is installed at the bottom of comb teeth and connected with the welding controller. And a flameout controller of the gas welding gun is connected with the welding controller. The invention also provides a welding method. The temperature sensor is used for monitoring the welding temperature of the busbar, and when the temperature exceeds the standard, flames of the gas welding gun cool the comb plate through the cooling gas channel, so that the welding temperature is accurately controlled, the corrosion resistance of the busbar is improved, and the floating charge service life of a battery is prolonged.

Description

Technical Field

[0001] The present invention relates to a welding device and a welding method for a lead-acid battery bus bar, which can greatly improve the corrosion resistance of the bus bar and belongs to the technical field of storage batteries. Background Art

[0002] Valve-regulated lead-acid batteries (VRLA) for communication are mainly used in large data rooms of mobile, unicom, telecom, etc. Their usage mode is mainly floating charge standby. Once the mains power fails or an accident occurs, the battery can supply power. Therefore, valve-regulated lead-acid batteries for communication are in a floating charge state for a long time. Valve-regulated lead-acid batteries for communication are widely used for their advantages such as low cost, maintenance-free, and long floating charge life. However, in recent years, as the requirements for the battery quality assurance period of major operators have increased year by year, how to extend the floating charge life of the battery has also been put on the agenda. At present, when designing such batteries, the main consideration is whether the corrosion growth of the positive grid (when the positive electrode plate of the battery is in a high potential state, the alloy will undergo an oxidation reaction to form a compound. This process is called corrosion, and along with the alloy corrosion, the volume of the alloy component increases, which is collectively called corrosion growth) can meet its life requirements. However, in actual use, it is sometimes found that it is not the corrosion of the positive grid that affects the floating charge life of the battery, but the corrosion of the bus bar that prematurely ends the floating charge life of the valve-regulated lead-acid battery for communication. This poses a new problem for us, that is, how to improve the corrosion resistance of the bus bar of the valve-regulated lead-acid battery for communication.

[0003] Valve-regulated lead-acid batteries are designed with a lean electrolyte. The bus bar and the terminal post are located in the upper space of the battery. The atmosphere in the upper space of the battery will change with the extension of the floating charge time. At the beginning, it is also a strong acidic environment. After the oxygen recombination efficiency increases, the generation of acid mist decreases, and the climbing sulfuric acid is also consumed due to the corrosion of the bus bar. The upper space of the battery gradually becomes neutral and further becomes weakly alkaline. In an alkaline environment, the lead in the bus bar corrodes, and the corrosion product is mainly PbO·PbS04. Due to the loose structure and weak alkalinity of the corrosion product PbO·PbS04, it will cause further corrosion of the bus bar matrix to intensify. At this time, if the bus bar alloy is a coarse grain structure, according to the theory of intergranular corrosion, the corrosion will rapidly proceed along the grain boundaries into the depth of the bus bar, quickly causing the bus bar structure to disintegrate and ultimately leading to battery failure.

[0004] At present, the welding parameters of the battery bus bar are controlled by the welding experience of the operator. The patent document with the publication number CN103264153A and the title "A Welding Method for the Bus Bar of a Lead-Acid Battery" discloses a technical solution, which includes the following steps: fixing the ears of the isotropic plates of the battery in a fixture; injecting a certain amount of paste solder into the casting cavity; dipping the ears into the paste solder; quickly heating the casting cavity until the solder melts; quickly cooling the casting cavity for a certain period of time to form a bus bar welded to the ears, and taking out the ears; continuing to cool the casting cavity to 60 to 80 degrees Celsius for the next set of operations. By adopting the casting welding method to form the bus bar of the lead-acid battery and quickly cooling and shaping it, the bus bar is taken out of the mold when the temperature of the casting cavity is relatively high, thus ensuring the welding quality, reducing the volatilization of the solder at high temperature, saving the amount of solder used, and reducing the production cost. However, due to the differences in the levels of different operators, if the local temperature is overheated during the welding process, some alloy components will be burned out. The differences in the alloy microstructure will cause serious segregation of Sn, making Sn accumulate at the crystal band. The differences in the chemical composition between the grain boundaries and grains of the bus bar alloy will form corrosion primary batteries in the sulfuric acid electrolyte. At the same time, when the temperature of the bus bar welding is too high, the grains of the bus bar will grow, and the intergranular corrosion will intensify. Moreover, when the temperature of the bus bar welding is too high, over-welding will occur at the bottom ears, and it is easy to have the phenomenon of plate dropping. On the other hand, disassembling the welding tooling during the solidification process of the bus bar will cause the grains of the later solidified part to be coarser than those of the earlier solidified part. During the use of the battery, the intergranular corrosion is serious, resulting in early battery failure. The coarsening of the bus bar grains cannot be eliminated after welding, and the phenomenon of early battery failure due to coarse grains often occurs. Therefore, how to effectively prevent the coarsening of the bus bar grains has become a difficult problem faced by relevant technical personnel. Summary of the Invention

[0005] The purpose of the present invention is to provide a welding device and method for the bus bar of a lead-acid battery to improve the corrosion resistance of the bus bar and extend the floating charge life of the battery in view of the drawbacks of the prior art.

[0006] The problems of the present invention are solved by the following technical solutions: A welding device for a lead-acid battery bus bar, comprising a gas welding torch, a welding box, two comb plates, a pressing strip, a lower temperature sensor and a welding controller. The electrode group of the lead-acid battery is placed in the welding box. The pressing strip is placed between the lugs of the positive and negative plates of the electrode group. The two comb plates are symmetrically placed on both sides of the pressing strip and are in close contact with the pressing strip. Comb teeth are provided at the positions of each comb plate corresponding to the lugs, and the lugs are inserted into the gaps between the comb teeth. The upper surface of the comb plate corresponding to the lugs is recessed to form a welding groove with the lugs and the pressing strip. A cooling air duct is provided inside the comb plate. The cooling air duct is connected to a high-pressure air source through a cooling air pipe. A cold air solenoid valve connected to the welding controller is installed on the cooling air pipe. The lower temperature sensor is installed at the bottom of the comb teeth and is connected to the welding controller. The flameout controller of the gas welding torch is connected to the welding controller.

[0007] For the above-mentioned welding device for a lead-acid battery bus bar, an upper temperature sensor is provided on the comb plate. The upper temperature sensor is embedded at the top of the comb plate and is located at the side of the welding groove. The signal output end of the upper temperature sensor is connected to the welding controller.

[0008] For the above-mentioned welding device for a lead-acid battery bus bar, positioning holes are provided on the comb plate. A comb plate positioning mechanism is provided at the end of the welding outer box. The comb plate positioning mechanism includes a positioning rod and an electric telescopic rod. The electric telescopic rod is vertically fixed on the outer wall of the welding outer box through 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 a through hole on the horizontal flange at the upper end of the side wall of the welding outer box and corresponds to the positioning hole on the comb plate.

[0009] For the above-mentioned welding device for a lead-acid battery bus bar, the welding box is fixed inside the welding outer box. Horizontal sliding grooves perpendicular to the pressing strip are provided at both ends of the welding outer box. Both ends of each comb plate are slidably connected to the sliding grooves.

[0010] For the above-mentioned welding device for a lead-acid battery bus bar, one side plate of the welding box parallel to the positive and negative plates in the electrode group is a movable side plate. A pole group thickness adjusting device corresponding to the movable side plate is installed on the welding outer box. The pole group thickness adjusting device includes a horizontal ejector rod and an adjusting cylinder. The adjusting cylinder is fixed on the side wall of the welding outer box. One end of the horizontal ejector rod is coaxially connected to the piston rod of the adjusting cylinder, and the other end is vertically connected to the middle of the movable side plate.

[0011] For the above-mentioned welding device for a lead-acid battery bus bar, the cooling air duct in the comb plate includes a longitudinal air duct perpendicular to the electrode plate and a transverse air duct parallel to the comb teeth, and the longitudinal air duct and the transverse air duct are interconnected. One end of the longitudinal air duct is connected to the cooling air pipe. Transverse air ducts are provided on both sides of each lug, and a transverse air duct is provided at the center position of each comb tooth. A plurality of ventilation holes facing downwards are opened on the longitudinal air duct and the transverse air duct.

[0012] For the above-mentioned welding device for the bus bar of a lead-acid battery, the flameout controller of the gas welding torch includes a gas solenoid valve and an oxygen solenoid valve. The gas solenoid valve is installed on the gas pipeline of the gas welding torch, and the oxygen solenoid valve is installed on the oxygen pipeline of the gas welding torch. The control ends of the gas solenoid valve and the oxygen solenoid valve are connected to the welding controller.

[0013] For the above-mentioned welding device for the bus bar of a lead-acid battery, the bottom plate of the welding box includes a plurality of longitudinal beams perpendicular to the positive and negative plates in the electrode group. The plurality of longitudinal beams are arranged at equal intervals, and there are gaps between adjacent longitudinal beams.

[0014] A welding method for the bus bar of a lead-acid battery, the method comprising the following steps: a. Load the electrode group into the welding box, adjust the positions of the lugs on the positive and negative plates of the electrode group, and place the pressing strip between the lugs of the positive and negative plates. b. Start the adjustment cylinder. The adjustment cylinder drives the movable side plate to move through the horizontal ejector rod, and adjusts the thickness of the electrode group to the set value. c. Slide the two comb plates towards each other until they close with the pressing strip. The lugs on the positive plate and the lugs on the negative plate are respectively inserted into the gaps between the teeth of the two comb plates. Place the electrode post at the designated position in the welding groove, and control the comb plate positioning mechanism to lock the comb plates. d. The operator melts the welding rod with a gas welding torch. The melted lead liquid flows into the welding groove. At the same time, the flame of the welding torch melts the lugs of the electrode plate and the base of the electrode post, and merges with the melted lead liquid of the welding rod to form a bus bar. e. When the temperature value measured by the lower temperature sensor is greater than the set upper limit value of the welding temperature, the welding controller extinguishes the flame of the gas welding torch through the flameout controller, stops heating, prevents over-welding of the lugs, and at the same time opens the cold air solenoid valve to cool the comb plates. f. After welding, if the temperature value measured by the upper temperature sensor is greater than the set demolding temperature, the welding controller controls the comb plate positioning mechanism to lock the comb plates; when the temperature value measured by the upper temperature sensor drops to the set demolding temperature, the welding controller controls the comb plate positioning mechanism to unlock the comb plates. g. After the comb plate positioning mechanism unlocks the comb plates, open the comb plates, take out the pressing strip, retract the piston rod of the adjustment cylinder, take out the electrode group, and complete the welding of the bus bar.

[0015] For the above-mentioned welding method for the bus bar of a lead-acid battery, the upper limit value of the welding temperature is set to 460 °C; the demolding temperature is set to 300 °C. Beneficial effects

[0016] The present invention uses a temperature sensor to monitor the welding temperature of the bus bar. Once the temperature exceeds the standard, the flame of the gas welding torch is turned off, and at the same time, the comb plate is cooled through the cooling air duct, so that the welding temperature can be precisely controlled, the corrosion resistance of the bus bar can be improved, the phenomenon of corrosion fracture can be prevented, and the floating charge life of the battery can be extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described in detail below with reference to the accompanying drawings.

[0018] Figure 1 is a schematic structural diagram of the welding device for the bus bar of the lead-acid battery of the present invention; Figure 2 is Figure 1 the left view of Figure 3 is Figure 1 the top view of Figure 4 is a schematic structural diagram of the comb plate and the pressing strip; Figure 5 is Figure 4 the A-A sectional view of Figure 6 is Figure 4 the partial enlarged view at I in Figure 7 is a schematic structural diagram of the welding box; Figure 8 is Figure 7 the left view of Figure 9 is Figure 7 the top view of

[0019] In the figure, each label is: 1, welding box; 2, welding outer box; 3, electrode group; 4, slideway; 5, fixing screw; 6, comb plate; 7, pressing strip; 8, lower temperature sensor; 9, movable baffle; 10, upper temperature sensor; 11, cooling air duct; 12, connecting pipe; 13, horizontal ejector rod; 14, adjusting cylinder; 15, cooling air pipe; 16, positioning rod; 17, electric telescopic rod; 18, electrode post; 19, electrode tab; 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 DESCRIPTION OF THE INVENTION

[0020] In view of the problems existing in the prior art, the present invention provides a welding device and method for the bus bar of a lead-acid battery. The technical solution is to install a temperature sensor on the comb plate and open a cooling air duct, and the cooling air duct is connected to the cooling air pipe, so that the welding temperature can be precisely controlled, and the welding of the highly corrosion-resistant bus bar can be realized.

[0021] Refer to Figures 1 - 3, the welding device for the bus bar of the lead-acid battery provided by the present invention includes a welding box 1, a welding outer box 2, two comb plates 6, a pressing strip 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).

[0022] During welding, the electrode group 3 is loaded into the welding box 1. The welding box 1 containing the electrode group 3 is placed in the welding outer box 2 and fixed. The positions of the lugs 19 on the positive and negative plates are adjusted. The pressing strip 7 is placed between the lugs 19 of the positive and negative plates. Horizontal slides 4 perpendicular to the pressing strip 7 are provided at both ends of the welding outer box 2. The two comb plates 6 are respectively located on both sides of the pressing strip 7. Both ends of each comb plate 6 are slidably connected to the slide 4. When the two comb plates 6 slide towards each other and close to the pressing strip 7, the lugs 19 on the positive plate and the lugs 19 on the negative plate are respectively inserted into the gaps between the teeth 20 of the two comb plates 6. The upper surface of the comb plate 6 is recessed at parts corresponding to the lugs 19. A welding groove 21 is formed by the comb plate 6, the electrode lug 19 and the pressing strip 7. The pole column 18 is placed at a specified position in the welding groove 21. The operator melts the welding rod with a gas welding torch. The molten lead flows into the welding groove 21. At the same time, the flame of the welding torch also melts the bases of the electrode lug 19 and the pole column 18, integrating with the molten lead of the welding rod. After the lead cools, a bus bar is formed, connecting the electrode lug 19 and the pole column 18 together.

[0023] The lower temperature sensor 8 is installed at the bottom of the teeth 20 of the comb plate 6, close to the lug 19 of the electrode plate. The signal output end 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 ends are connected to the welding controller 24. The welding controller 24 adopts a PLC module, which is used to control the flameout controller and send alarm information. When the temperature value measured by the lower temperature sensor 8 is greater than the set upper limit value of the welding temperature, the welding controller 24 sends an alarm message and closes the gas solenoid valve 25 and the oxygen solenoid valve 27 to extinguish the flame of the gas welding torch and stop heating, preventing over-welding of the lug 19.

[0024] See Figures 1 - 6 , a cooling air channel 11 is provided in the comb plate 6. The cooling air channel 11 is connected to a high-pressure air source through 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 value measured by the lower temperature sensor 8 is greater than the set upper limit value of the welding temperature, the welding controller 24 opens the cold air solenoid valve 26 to cool the comb plate 6. A large number of experimental results show that the welding temperature is preferably not higher than 460 °C. Therefore, the upper limit value of the welding temperature is set to 460 °C.

[0025] See Figures 4 - 6, the cooling air channels 11 in the comb plate 6 include longitudinal air channels perpendicular to the electrode plates and transverse air channels parallel to the comb teeth, and the longitudinal air channels and the transverse air channels are interconnected. The diameter of the cooling air channels 11 is 1 / 3 of the thickness of the comb plate 6; the longitudinal air channels are 5 - 10 mm away from the bus bar. The cooling air channels 11 are provided with a plurality of vent holes opening downward, the hole pitch of the vent holes is 10 mm, the hole diameter is 1 mm, and one end of the longitudinal air channel is connected to the cooling air duct 15; transverse air channels are provided on both sides of each tab 19, and a transverse air channel is arranged at the center position of each comb tooth 20. The spacing of the transverse air channels is the same as the center distance of the positive electrode plates (or negative electrode plates) in the electrode group 3. The number of transverse air channels on each comb plate 6 is at least the number of comb teeth 20 plus 2.

[0026] See Figures 1 - 3 , 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 through 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 a 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. The control end of the electric telescopic rod 17 is connected to the welding controller 24. When welding the bus bar, 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. An upper temperature sensor 10 is embedded at the top of the comb plate 6, close to the bus bar. The signal output end of the upper temperature sensor 10 is connected to the welding controller 24. When the temperature value measured by the upper temperature sensor 10 is greater than the set demoulding 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 demoulding 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 removal of the comb plate 6. According to verification, when the temperature at the bottom of the bus bar reaches below 300 °C, the bus bar is completely solidified. Therefore, the demoulding temperature is set to 300 °C, which can ensure that the bus bar is completely solidified during demoulding and prevent the grains of the bus bar from being coarse.

[0027] The horizontal slideway 4 is in the shape of an angle steel. Its vertical plate is fixedly connected to the horizontal flange at the upper end of the side wall of the welding outer box 2 through a fixing screw 5. A chute matching the end of the comb plate 6 is formed between the top horizontal plate and the horizontal flange at the upper end of the side wall of the welding outer box 2. The comb plate 6 can slide freely along the chute. A connecting pipe 12 is provided in the through hole on the vertical plate of the horizontal slideway 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 channels 11 in the comb plate 6.

[0028] See Figure 1 、 Figures 7 - 9, the bottom plate of the welding box 1 is composed of a plurality of longitudinal beams 23 perpendicular to the positive and negative plates in the electrode group 3. The plurality of longitudinal beams 23 are arranged at equal intervals, and there are gaps between adjacent longitudinal beams 23. The gaps can accommodate lead beans and lead slag to prevent the bottom of the electrode group 3 from being short-circuited by the falling lead beans and lead slag. The longitudinal beams 23 are made of round tubes, and slag discharge ports can be opened at the lower ends of the side walls of the welding box 1 to discharge lead beans and lead slag.

[0029] The welding box 1 can contain a single electrode group or two or more electrode groups 3; a movable baffle 9 is provided between two adjacent electrode groups 3.

[0030] One side plate 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 adjusting device corresponding to the movable side plate 22 is installed on the welding outer box 2. The electrode group thickness adjusting device includes a horizontal ejector 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 ejector 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.

[0031] The welding method of the lead-acid battery busbar includes the following steps: a. Load the electrode group 3 into the welding box 1, adjust the positions of the lugs 19 on the positive and negative plates of the electrode group 3, and place the pressure strip 7 between the lugs 19 of the positive and negative plates. b. Start the adjusting cylinder 14. The adjusting cylinder 14 drives the movable side plate 22 to move through the horizontal ejector rod 13, and adjusts the thickness of the electrode group 3 to the set value. c. Slide the two comb plates 6 towards each other until they close with the pressure strip 7. The lugs 19 on the positive plate and the lugs 19 on the negative plate are respectively inserted into the gaps between the teeth 20 of the two comb plates 6. Place the electrode post 18 at the designated position in the welding groove 21, and control the comb plate positioning mechanism to lock the comb plates 6. d. The operator melts the welding rod with a gas welding torch. The melted lead liquid flows into the welding groove 21. At the same time, the flame of the welding torch melts the bases of the plate lugs 19 and the electrode post 18, which are integrated with the melted lead liquid of the welding rod to form a busbar. e. When the temperature value measured by the lower temperature sensor 8 is greater than the set upper limit of the welding temperature, the welding controller 24 extinguishes the flame of the gas welding torch through the flameout controller, stops heating, prevents over-welding of the lugs 19, and at the same time opens the cold air solenoid valve 26 to cool the comb plates 6. f. After welding, if the temperature value measured by the upper temperature sensor 10 is greater than the set demoulding temperature, the welding controller 24 controls the comb plate positioning mechanism to lock the comb plates 6; when the temperature value measured by the upper temperature sensor 10 drops to the set demoulding temperature, the welding controller 24 controls the comb plate positioning mechanism to unlock the comb plates 6. g. After the comb plate positioning mechanism unlocks the comb plate 6, open the comb plate 6, remove the pressure strip 7, adjust the piston rod of the cylinder 14 to retract, remove the electrode group 3, and complete the welding of the bus bar.

[0032] Effect after implementation: Detect according to the high-temperature accelerated floating charge life test method in 7.23.2 of the national standard of YD / T 799-2010 Valve-regulated sealed lead-acid batteries for communication: observe the battery bus bar after the discharge test, and the observation results are shown in the following table: Unit number Unit 1 Unit 2 Unit 3 Unit 4 Unit 5 Unit 6 Unit 7 Unit 8 Unit 9 Overheated welded bus bar Intact Intact Intact Intact Corroded and fractured Welded bus bar applying the present invention Intact Intact Intact Intact Intact Intact Intact Intact Intact It can be seen that the present invention can effectively improve the welding quality of the bus bar, prevent the occurrence of corrosion and fracture phenomena, and extend the floating charge life of the battery.

Claims

1. A welding device for a lead-acid battery bus bar, characterized in that It includes a gas welding torch, a welding box (1), two comb plates (6), a pressing strip (7), a lower temperature sensor (8) and a welding controller (24). The electrode group (3) of a lead-acid battery is placed inside the welding box (1). The pressing strip (7) is placed between the electrode tabs (19) of the positive and negative plates of the electrode group (3). The two comb plates (6) are symmetrically placed flat on both sides of the pressing strip (7) and are in close contact with the pressing strip (7). At the position corresponding to the electrode tab (19) on each comb plate (6), there are comb teeth (20). The electrode tab (19) is inserted into the gap between the comb teeth (20). The upper surface of the comb plate (6) corresponding to the electrode tab (19) is recessed to form a welding groove (21) with the electrode tab (19) and the pressing strip (7). A cooling air duct (11) is provided inside the comb plate (6). The cooling air duct (11) is connected to a high-pressure air source through a 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 teeth (20) and is connected to the welding controller (24). The flameout controller of the gas welding torch is connected to the welding controller (24).

2. The welding device for the bus bar of a lead-acid battery according to claim 1, characterized in that, An upper temperature sensor (10) is provided on the comb plate (6). The upper temperature sensor (10) is embedded at the top of the comb plate (6) and is located at 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. The welding device for a lead-acid battery bus bar according to claim 1 or 2, characterized in that, The comb plate (6) is provided with positioning holes. At the end of the outer welding box (2), there is 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 box (2) through 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 a through hole on the horizontal flange at the upper end of the side wall of the welding box (2) and corresponds to the positioning hole on the comb plate (6).

4. A welding device for a lead-acid battery bus bar according to claim 3, characterized in that, The welding box (1) is fixed inside the outer welding box (2). Horizontal slideways (4) perpendicular to the pressing strip (7) are provided at both ends of the outer welding box (2). Both ends of each comb plate (6) are slidably connected to the slideway (4).

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

6. The welding device for the bus bar of a lead-acid battery according to claim 5, characterized in that, The cooling air channels (11) in the comb plate (6) include longitudinal air channels perpendicular to the plate electrodes and transverse air channels parallel to the comb teeth (20), and the longitudinal air channels and the transverse air channels communicate with each other. One end of the longitudinal air channel is connected to the cooling air duct (15); transverse air channels are provided on both sides of each tab (19), and a transverse air channel is arranged at the central position of each comb tooth (20). A plurality of ventilation holes facing downward are opened on the longitudinal air channels and the transverse air channels.

7. The welding device for a lead-acid battery bus bar according to claim 6, characterized in that, The flameout controller of the gas welding torch includes a gas solenoid valve (25) and an oxygen solenoid valve (27). The gas solenoid valve (25) is installed on the gas pipeline of the gas welding torch, and the oxygen solenoid valve (27) is installed on the oxygen pipeline of the gas welding torch. The control ends of the gas solenoid valve (25) and the oxygen solenoid valve (27) are connected to the welding controller (24).

8. A welding device for a lead-acid battery bus bar according to claim 7, characterized in that, The bottom plate of the welding box (1) includes a plurality of longitudinal beams (23) perpendicular to the positive and negative plate electrodes in the electrode group (3). The plurality of longitudinal beams (23) are arranged at equal intervals, and a gap is left between adjacent longitudinal beams (23).

9. A welding method for the bus bar of a lead-acid battery using the welding device according to any one of claims 5-8, characterized in that, The method includes the following steps: a. Load the electrode group (3) into the welding box (1), adjust the positions of the tabs (19) on the positive and negative plate electrodes of the electrode group (3), and place the pressing strip (7) between the tabs (19) of the positive and negative plate electrodes. b. Start the adjustment cylinder (14). The adjustment cylinder (14) drives the movable side plate (22) to move through the horizontal ejector rod (13), and adjusts the thickness of the electrode group (3) to the set value. c. Slide the two comb plates (6) towards each other until they close with the pressing strip (7). The tabs (19) on the positive plate electrode and the tabs (19) on the negative plate electrode are respectively inserted into the gaps between the comb teeth (20) of the two comb plates (6). Place the pole column (18) at the designated position in the welding groove (21), and control the comb plate positioning mechanism to lock the comb plate (6). d. The operator melts the welding rod with the gas welding torch. The molten lead flows into the welding groove (21). At the same time, the flame of the welding torch melts the bases of the plate electrode tabs (19) and the pole column (18), which are integrated with the molten lead of the welding rod to form a bus bar. e. When the temperature value measured by the lower temperature sensor (8) is greater than the set upper limit value of the welding temperature, the welding controller (24) extinguishes the flame of the gas welding torch through the flameout controller, stops heating, prevents over-welding of the tabs (19), and at the same time opens the cold air solenoid valve (26) to cool the comb plate (6). f. After welding, 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). g. After the comb plate positioning mechanism unlocks the comb plate (6), open the comb plate (6), take out the pressing strip (7), retract the piston rod of the adjustment cylinder (14), take out the electrode group (3), and complete the welding of the bus bar.

10. The welding method of the lead-acid battery bus bar according to claim 9, characterized in that, The upper limit value of the welding temperature is set to 460 °C; the demolding temperature is set to 300 °C.

Images