Novel laser welding device for battery shell

Abstract

The invention belongs to the technical field of laser welding, and particularly relates to a novel battery shell laser welding device which comprises a control cabinet and a welding table fixedly mounted at the top of the control cabinet, a laser welding head is arranged above the welding table, the novel battery shell laser welding device further comprises a supporting displacement unit mounted at the top of the welding table, and a laser welding head is arranged above the supporting displacement unit. The supporting displacement unit is used for driving the laser welding head to move along the seam of the battery shell; the roller is arranged on one side of the supporting displacement unit, and the supporting displacement unit is used for driving the roller to roll along the seam of the battery shell. Residual air in the welding seam can be effectively exhausted, defects such as air holes can be reduced, the density and mechanical property of the welding seam can be improved, bulging deformation of the welding seam can be restrained, assembling interference is avoided, meanwhile, high-temperature oxidation can be prevented through inert gas injection, cooling and shaping of the welding seam are assisted, temporary anti-oxidation protection is conducted on the welded welding seam, and the welding seam quality is improved. The oxidation degree is reduced.

Description

Technical Field

[0001] This invention belongs to the field of laser welding technology, and in particular relates to a novel laser welding device for battery casings. Background Technology

[0002] The aluminum casing of new energy vehicle batteries needs to balance lightweighting and safety. Laser welding, with its high precision and deep penetration welding characteristics, is widely used in the welding of battery casing cover plates and outer frames. It can achieve millimeter-level precise positioning, form dense welds, ensure the airtightness and structural strength of the casing, and effectively solve the problems of insufficient penetration and large deformation in traditional welding, thus meeting the requirements of high reliability and large-scale production of batteries.

[0003] For example, a laser welding device for a power battery casing disclosed in patent publication number CN118287827A is used to weld the cover plate of a rectangular battery casing along the joint between the cover plate and the outer frame after the cover plate is assembled with the outer frame.

[0004] Due to aluminum's high reflectivity and rapid thermal conductivity, the high-speed welding process during the laser welding of the battery's aluminum casing cover and frame results in a rapid solidification rate of the molten pool and insufficient time for gas to escape, which easily leads to internal defects such as porosity and slag inclusions, affecting the weld's density. Secondly, existing clamping mechanisms typically fix the cover to the frame using vertical pressure. This vertical clamping force exerts a lateral squeezing effect on the weld area, causing the weld material to bulge outwards. If the bulging is too large, it may interfere with other components during subsequent battery assembly, affecting the overall assembly accuracy and structural reliability. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a novel laser welding device for battery casings.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a novel laser welding device for battery casings, comprising a control cabinet and a welding table fixedly installed on the top of the control cabinet, wherein a laser welding head is disposed above the welding table, and further comprising:

[0007] A support displacement unit is installed on top of the welding table, and the support displacement unit is used to drive the laser welding head to move along the joint of the battery casing;

[0008] A roller is disposed on one side of the support displacement unit, which is used to drive the roller to roll along the joint of the battery casing.

[0009] An air jet protection unit is installed on the end face of the welding station. The air jet protection unit is used to spray inert gas into the joint of the battery casing.

[0010] A positioning and clamping unit is installed on the top of the welding table. The positioning and clamping unit is used to press and fix the battery casing.

[0011] Preferably, the support displacement unit includes a support base fixedly installed on the top of the welding table. A rotating seat is rotatably connected to the upper end of the outer side wall of the support base. Two horizontal push electric actuators are fixedly installed on the side wall of the rotating seat. A rotating support mechanism is installed at the telescopic end of each of the two horizontal push electric actuators. One of the rotating support mechanisms is used to support the laser welding head, and the other rotating support mechanism is used to support the roller. A motor drive assembly is installed on the outer side wall of the support base. The motor drive assembly is used to drive the rotating seat to rotate. Both horizontal push electric actuators and the motor drive assembly are electrically connected to the control cabinet.

[0012] Preferably, the jet protection unit includes an annular air chamber inside the support base. Multiple electric nozzles are fixedly inserted into the inner wall of the annular air chamber, and the outlet end of each electric nozzle faces the joint of the battery casing. A motor pump is fixedly installed inside the control cabinet, and the output end of the motor pump is fixedly connected to an air injection pipe that communicates with the annular air chamber. The motor pump delivers inert gas into the annular air chamber through the air injection pipe, and the motor pump is electrically connected to the control cabinet.

[0013] Preferably, the positioning and clamping unit includes a positioning seat fixedly installed on the end face of the welding table. Multiple elastic support components are installed on the side wall of the positioning seat. A frame is fixedly installed on the end face of the welding table. A hydraulic cylinder is fixedly inserted into the end face of the frame. A clamping plate is fixedly installed on the telescopic end of the hydraulic cylinder. The hydraulic cylinder is electrically connected to the control cabinet.

[0014] Preferably, both of the rotating support mechanisms include a U-shaped frame fixedly installed at the telescopic end of the horizontal push electric actuator. The U-shaped frame is rotatably connected to a rotating column. A motor drive assembly is installed on the end face of the U-shaped frame, and the motor drive assembly is used to drive the rotating column to rotate. The laser welding head is fixedly inserted through the rotating column on the same side, and the laser emitting end of the laser welding head extends to the outside of the rotating column. The control cabinet controls the operation of the laser welding head. The roller is rotatably connected to a mounting frame, and a pressure sensor is fixedly installed on the side wall of the mounting frame. The pressure sensor is fixedly installed on the side wall of the rotating column on the same side. The control cabinet controls the operation of the corresponding horizontal push electric actuator according to the electrical signal fed back by the pressure sensor. An oil injection assembly is provided inside one of the rotating columns, and an oil coating assembly is provided inside the roller. The oil injection assembly and the oil coating assembly are connected.

[0015] Preferably, the oil injection assembly includes a vertical electric push rod disposed on one side of the roller, and an oil storage chamber is formed inside the rotating column on the same side as the vertical electric push rod. A piston is slidably connected inside the oil storage chamber, and the oil storage chamber is filled with protective oil at the position above the piston. The vertical electric push rod is fixedly inserted into the lower cavity wall of the oil storage chamber, and the telescopic end of the vertical electric push rod is fixedly connected to the bottom of the piston. An oil injection hose is fixedly inserted into the upper cavity wall of the oil storage chamber.

[0016] Preferably, the oiling assembly includes a sponge pad fixedly filled inside the roller, the side wall of the roller has a plurality of oil injection holes communicating with the pores of the sponge pad, the roller axle is hollow, and the side wall of the roller axle has a plurality of connecting holes, each of the connecting holes communicating with the pores of the sponge pad, and the oil injection hose is connected to the inside of the roller axle.

[0017] Preferably, an arc-shaped plate is fixedly installed on the inner side wall of the mounting bracket, and the arc-shaped plate is sleeved on the outer side of the roller. An arc-shaped rubber sealing gasket is fixedly installed on the inner side wall of the arc-shaped plate, and the inner side wall of the arc-shaped rubber sealing gasket abuts against the outer side wall of the roller. The arc-shaped rubber sealing gasket is used to prevent the protective oil from escaping through the oil injection hole on the same side.

[0018] Compared with existing technologies, the advantages of a new laser welding device for battery casings are:

[0019] 1. Through the coordinated operation of the control cabinet, welding table, laser welding head, and support displacement unit, laser welding can be performed on the outer frame and cover plate of the rectangular battery aluminum casing. The support displacement unit, along with the rollers, can squeeze the weld that has just been melted by the laser, thereby effectively expelling residual air inside the weld, reducing defects such as porosity, breaking down coarse columnar crystals and refining grains, improving the density and mechanical properties of the weld, and suppressing weld bulging deformation caused by clamping force, avoiding subsequent assembly interference, and achieving a comprehensive improvement in weld quality.

[0020] 2. The air jet protection unit can spray inert gas onto the weld after welding. On the one hand, it can minimize the oxidation of the high-temperature weld with air, which would affect the weld quality. On the other hand, it can promote the cooling and solidification of the weld.

[0021] 3. With the oil injection and oil coating components, a layer of protective oil can be applied to the surface of the laser weld after welding, which can temporarily protect the weld from oxidation after welding, further reduce the degree of weld oxidation, and help improve the quality of the battery casing. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a novel laser welding device for battery casing provided by the present invention;

[0023] Figure 2 This is a top view of the rotating base of a novel laser welding device for battery casings provided by the present invention.

[0024] Figure 3 This is a schematic diagram of the connection structure between the laser welding head and the rotating support mechanism of a novel laser welding device for battery casing provided by the present invention;

[0025] Figure 4 This is a schematic diagram of the connection structure between the roller and the rotating support mechanism of a novel laser welding device for battery casing provided by the present invention;

[0026] Figure 5 This invention provides a novel laser welding device for battery casings. Figure 2 Enlarged view of the structure of section A;

[0027] Figure 6 This is a schematic diagram of the connection structure between the clamping plate and the frame of a novel laser welding device for battery casings provided by the present invention;

[0028] Figure 7 This is a cross-sectional structural schematic diagram of the support base of a novel laser welding device for battery casing provided by the present invention;

[0029] Figure 8 This is a schematic diagram of the oil injection component of a novel laser welding device for battery casings provided by the present invention;

[0030] Figure 9 This is a schematic diagram of the oiling component of a novel laser welding device for battery casings provided by the present invention.

[0031] In the diagram: 1 Control cabinet, 2 Welding table, 3 Laser welding head, 4 Support displacement unit, 41 Support base, 42 Rotary base, 43 Horizontal push electric actuator, 44 Motor drive assembly, 5 Roller, 6 Jet protection unit, 61 Annular air chamber, 62 Electric nozzle, 63 Pump, 64 Air injection pipe, 7 Positioning clamping unit, 71 Positioning base, 72 Elastic support assembly, 73 Frame, 74 Hydraulic cylinder, 75 Pressure plate, 8 Rotary support mechanism, 81 U-shaped frame, 82 Rotary column, 83 Motor drive assembly, 84 Mounting bracket, 85 Pressure sensor, 9 Oil injection assembly, 91 Vertical push electric actuator, 92 Oil storage chamber, 93 Piston, 94 Oil injection hose, 10 Oiling assembly, 101 Sponge pad, 102 Oil injection hole, 103 Connecting hole, 11 Arc plate, 12 Arc rubber sealing gasket. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0033] like Figures 1-9 As shown, a novel laser welding device for battery casings includes a control cabinet 1 and a welding table 2 fixedly installed on the top of the control cabinet 1. A laser welding head 3 is disposed above the welding table 2. The device also includes a support displacement unit 4, which is installed on the top of the welding table 2 and is used to drive the laser welding head 3 to move along the joint of the battery casing. The support displacement unit 4 includes a support base 41 fixedly installed on the top of the welding table 2. A rotating seat 42 is rotatably connected to the upper end of the outer side wall of the support base 41. Two horizontal push electric push rods 43 are fixedly installed on the side wall of the rotating seat 42. A rotating support mechanism 8 is installed at the telescopic end of each of the two horizontal push electric push rods 43. One rotating support mechanism 8 supports the laser welding head 3, and the other rotating support mechanism 8 supports a roller 5. A motor drive assembly 44 is installed on the outer side wall of the support base 41, which drives the rotating seat 42 to rotate. Both the horizontal push electric actuator 43 and the motor drive assembly 44 are electrically connected to the control cabinet 1. Both rotating support mechanisms 8 include a U-shaped frame 81 fixedly installed at the telescopic end of the horizontal push electric actuator 43. The U-shaped frame 81 is rotatably connected to a rotating column 82. The end face of the U-shaped frame 81 is equipped with a motor drive assembly 83, which is used to drive the rotating column 82 to rotate. The laser welding head 3 is fixedly inserted through the rotating column 82 on the same side, and the laser emitting end of the laser welding head 3 extends to the outside of the rotating column 82. The control cabinet 1 controls the operation of the laser welding head 3. The roller 5 is rotatably connected to a mounting bracket 84, and a pressure sensor 85 is fixedly installed on the side wall of the mounting bracket 84. The pressure sensor 85 is fixedly installed on the side wall of the rotating column 82 on the same side. The control cabinet 1 controls the operation of the corresponding horizontal push electric actuator 43 according to the electrical signal fed back by the pressure sensor 85. The pressure sensor 85 can convert pressure into an electrical signal and feed it back to the control cabinet 1.

[0034] Roller 5 is located on one side of support displacement unit 4. Support displacement unit 4 is used to drive roller 5 to roll along the joint of battery casing. Jet protection unit 6 is installed on the end face of welding table 2. Jet protection unit 6 is used to spray inert gas into the joint of battery casing. Jet protection unit 6 includes an annular air chamber 61 opened inside support base 41. Multiple electric nozzles 62 are fixedly inserted into the inner wall of annular air chamber 61, and the outlet end of each electric nozzle 62 faces the joint of battery casing. A motor pump 63 is fixedly installed inside control cabinet 1, and the output end of motor pump 63 is fixedly connected to an injection pipe 64 connected to an annular air chamber 61. Motor pump 63 delivers inert gas into annular air chamber 61 through injection pipe 64, and motor pump 63 is electrically connected to control cabinet 1. The suction end of motor pump 63 is connected to an external inert gas storage tank.

[0035] The positioning and clamping unit 7 is installed on the top of the welding table 2. The positioning and clamping unit 7 is used to press and fix the battery casing. The positioning and clamping unit 7 includes a positioning seat 71 fixedly installed on the end face of the welding table 2. Multiple elastic support components 72 are installed on the side wall of the positioning seat 71. A frame 73 is fixedly installed on the end face of the welding table 2. A hydraulic cylinder 74 is fixedly inserted on the end face of the frame 73. A pressing plate 75 is fixedly installed on the telescopic end of the hydraulic cylinder 74. The hydraulic cylinder 74 is electrically connected to the control cabinet 1. The elastic support component 72 includes an elastic element and a positioning block. The positioning block is installed in the positioning groove on the side wall of the positioning seat 71 through the elastic element. After the outer frame of the battery casing is inserted into the outside of the positioning seat 71, the positioning block abuts against the inner wall of the outer frame under the support of the elastic element, so as to achieve the effect of positioning the outer frame.

[0036] One of the rotating columns 82 has an oil injection assembly 9 inside. The oil injection assembly 9 includes a vertical electric push rod 91 located on one side of the roller 5. An oil storage chamber 92 is opened inside the rotating column 82 on the same side as the vertical electric push rod 91. A piston 93 is slidably connected inside the oil storage chamber 92. The oil storage chamber 92 is filled with protective oil above the piston 93. The vertical electric push rod 91 is fixedly inserted into the lower cavity wall of the oil storage chamber 92, and the telescopic end of the vertical electric push rod 91 is fixedly connected to the bottom of the piston 93. An oil injection hose 94 is fixedly inserted into the upper cavity wall of the oil storage chamber 92. The top of the oil storage chamber 92 is provided with an oil filling hole, and a sealing post is threaded into the hole for adding protective oil into the oil storage chamber 92. A liquid level sensor can be installed inside the oil storage chamber 92 and electrically connected to the control cabinet 1 to remind personnel to add protective oil in time. The protective oil is made of high-temperature resistant silicon-based protective oil, graphene modified protective oil, etc.

[0037] The roller 5 is equipped with an oiling assembly 10, and the oiling assembly 9 is connected to the oiling assembly 10. The oiling assembly 10 includes a sponge pad 101 fixedly filled inside the roller 5. The side wall of the roller 5 has multiple oiling holes 102 that are connected to the pores of the sponge pad 101. The axle of the roller 5 is hollow, and the side wall of the axle of the roller 5 has multiple connecting holes 103. Each connecting hole 103 is connected to the pores of the sponge pad 101. The oiling hose 94 is connected to the inside of the axle of the roller 5. An arc-shaped plate 11 is fixedly installed on the inner side wall of the mounting bracket 84, and the arc-shaped plate 11 is sleeved on the outside of the roller 5. An arc-shaped rubber sealing gasket 12 is fixedly installed on the inner side wall of the arc-shaped plate 11, and the inner side wall of the arc-shaped rubber sealing gasket 12 abuts against the outer side wall of the roller 5. The arc-shaped rubber sealing gasket 12 is used to prevent the protective oil from escaping through the oiling hole 102 on the same side.

[0038] The operating principle of the present invention is explained as follows: The outer frame and cover plate of the rectangular battery outer frame are placed sequentially at the positioning seat 71 (refer to...). Figure 1 , Figure 1 The dotted line represents the outer frame and cover of the battery casing, and the dotted arrow indicates the installation direction. The outer frame is positioned by the elastic support component 72 on the side wall of the positioning seat 71 (the elastic support component 72 includes an elastic element and a positioning block. The positioning block is installed in the positioning groove on the side wall of the positioning seat 71 through the elastic element. After the outer frame is inserted into the outside of the positioning seat 71, the positioning block abuts against the inner wall of the outer frame under the support of the elastic element, thereby achieving the effect of positioning the outer frame). Then the control cabinet 1 is started.

[0039] After the control cabinet 1 is started, it immediately controls the hydraulic cylinder 74 to extend at a timed interval. The hydraulic cylinder 74 will drive the clamping plate 75 to move downwards. After the hydraulic cylinder 74 finishes its timed operation, the clamping plate 75 will press the cover plate of the battery casing tightly against the top of the outer frame. Subsequently, the control cabinet 1 will control the motor drive assembly 44 to operate. The motor drive assembly 44 will drive the rotating seat 42 to start rotating (the motor drive assembly 44 includes a motor, gear transmission assembly, coupling, etc.). The rotating seat 42 will then drive the two horizontal push electric actuators 43 to operate. At the same time, the control cabinet 1 controls the horizontal push electric actuators 43, the laser welding head 3, and the motor... The drive assembly 83 operates according to a preset program. The horizontal push electric push rod 43 can control the distance between the laser welding head 3 and the battery casing through the U-shaped frame 81 and the rotating column 82. The motor drive assembly 83 can adjust the angle of the rotating column 82 (the motor drive assembly 83 includes a motor, gear transmission assembly, coupling and other components). Since the rotating seat 42 starts to rotate at this time, with the cooperation of the horizontal push electric push rod 43 and the motor drive assembly 83, the laser welding head 3 will move along the joint between the outer frame and the cover plate of the battery casing, so that the outer frame and the cover plate of the battery casing can be welded through the laser welding head 3.

[0040] Similarly, roller 5 can also move along the seam between the outer frame and the cover plate of the battery casing (the distance between roller 5 and laser welding head 3 is about 5 cm). Since the weld has just been melted by the high temperature of the laser, and the horizontal push electric push rod 43 on the same side as roller 5 applies pressure to roller 5 through pressure sensor 85 and mounting bracket 84, roller 5 applies pressure to the weld as it moves along the weld. On the one hand, due to the pressure applied by roller 5, any air that may remain inside the weld will escape quickly, and under the pressure, these pores will be squeezed and sealed, thereby effectively improving the fusion fullness of the weld and increasing the weld strength. On the other hand, due to the pressure applied by roller 5, the weld cannot bulge excessively outward. This avoids bulging welds causing subsequent assembly interference (where, due to differences in the joints between the outer frame and cover of each battery casing, the weld melting state is different; by detecting the pressure between the horizontal push electric push rod 43 and the mounting bracket 84 through the pressure sensor 85, it can be ensured that the pressure applied to the weld by the roller 5 is kept in an appropriate state, avoiding excessive or insufficient pressure from affecting the shaping effect of the weld; the pressure threshold can be preset according to the size of the joint between the outer frame and cover of the battery casing, etc.). When the rotating seat 42 rotates 360°, the control cabinet 1 controls the laser welding head 3 to stop working, completing the full circumference welding of the outer frame and cover of the battery casing; when the rotating seat 42 rotates 370°, the control cabinet 1 controls the motor drive assembly 44 to stop working.

[0041] When the control cabinet 1 stops operating the motor drive assembly 44, the control cabinet 1 will first control the motor drive assembly 44 to drive the rotating seat 42 to rotate in the opposite direction and begin its return to its original position. Simultaneously, the control cabinet 1 will control the vertical push electric actuator 91 to drive the piston 93 to move upwards at a constant speed. As the piston 93 moves upwards, it will squeeze the protective oil inside the oil reservoir 92. At this time, the protective oil will enter the sponge pad 101 through the oil injection hose 94 and the axle of the roller 5. Under the action of the injected oil pressure, the protective oil will escape through the oil injection hole 102 on the side wall of the roller 5. Because the rotating seat 42 drives the roller 5 to begin its return to its original position, therefore... Roller 5 moves back along the completed weld. At this time, the protective oil discharged through the oil injection hole 102 will be applied to the weld, so that the protective oil can be used to temporarily seal the weld, reducing its contact with the outside air, thereby reducing the degree of oxidation of the weld (wherein, since the oil injection holes 102 on the side of roller 5 near the arc plate 11 are all blocked by the arc rubber sealing gasket 12, the protective oil can only escape along the oil injection hole 102 on the side near the weld, avoiding waste of protective oil). After the rotating seat 42, laser welding head 3, roller 5 and other components move back to their original positions, the welding of a single battery shell is completed.

[0042] At the start of welding, control cabinet 1 will control each electric nozzle 62 to open sequentially according to the program (in order to open the nozzles). Figure 2 For example, the initially opened electric nozzle 62 is located at the lower left arc-shaped position of the support base 41. This means the gas ejected from the electric nozzle 62 will be sprayed onto the weld seam after it has been squeezed by the roller 5, avoiding any impact on the roller 5's squeezing of the weld seam and the quality of laser welding. Simultaneously, the pump 63 is controlled to start working (the suction end of the pump 63 is connected to the inert gas storage tank). The pump 63 delivers inert gas into the annular gas chamber 61 through the gas injection pipe 64. The inert gas is then ejected through the opened electric nozzle 62. The ejected inert gas helps to minimize the oxidation of the high-temperature weld seam due to direct contact with air, and also assists in... The process aids in cooling the weld seam, facilitating its cooling and shaping. During welding, the air injection power of the pump 63 gradually increases to ensure that the air injection needs of each electric nozzle 62 are met. After the control cabinet 1 stops controlling the motor drive assembly 44, i.e., after the rotating seat 42 starts rotating, the control cabinet 1 controls each electric nozzle 62 to shut down sequentially according to the program. The air injection power of the pump 63 gradually decreases until the oiling work on the weld seam is completed. Through the dual measures of air injection and protective coating, the contact between the weld seam and air can be minimized, reducing the impact of weld oxidation on weld quality.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A novel laser welding device for battery casings, comprising a control cabinet (1) and a welding table (2) fixedly mounted on the top of the control cabinet (1), wherein a laser welding head (3) is disposed above the welding table (2), characterized in that, Also includes: A support displacement unit (4) is installed on the top of the welding table (2). The support displacement unit (4) is used to drive the laser welding head (3) to move along the joint of the battery casing. A roller (5) is provided on one side of the support displacement unit (4), which is used to drive the roller (5) to roll along the joint of the battery casing. A jet protection unit (6) is installed on the end face of the welding table (2). The jet protection unit (6) is used to spray inert gas into the joint of the battery casing. The positioning clamping unit (7) is installed on the top of the welding table (2) and is used to press and fix the battery casing.

2. The novel laser welding device for battery casing according to claim 1, characterized in that, The support displacement unit (4) includes a support base (41) fixedly installed on the top of the welding table (2). A rotating seat (42) is rotatably connected to the upper end of the outer side wall of the support base (41). Two horizontal push electric push rods (43) are fixedly installed on the side wall of the rotating seat (42). A rotating support mechanism (8) is installed on the telescopic end of the two horizontal push electric push rods (43). One of the rotating support mechanisms (8) is used to support the laser welding head (3), and the other rotating support mechanism (8) is used to support the roller (5). A motor drive assembly (44) is installed on the outer side wall of the support base (41). The motor drive assembly (44) is used to drive the rotating seat (42) to rotate. The two horizontal push electric push rods (43) and the motor drive assembly (44) are electrically connected to the control cabinet (1).

3. The novel laser welding device for battery casing according to claim 2, characterized in that, The jet protection unit (6) includes an annular air chamber (61) opened inside the support base (41). Multiple electric nozzles (62) are fixedly inserted into the inner wall of the annular air chamber (61), and the outlet of each electric nozzle (62) faces the joint of the battery casing. A motor pump (63) is fixedly installed inside the control cabinet (1), and the output end of the motor pump (63) is fixedly connected to an air injection pipe (64) connected to the annular air chamber (61). The motor pump (63) delivers inert gas into the annular air chamber (61) through the air injection pipe (64), and the motor pump (63) is electrically connected to the control cabinet (1).

4. The novel laser welding device for battery casing according to claim 1, characterized in that, The positioning and clamping unit (7) includes a positioning seat (71) fixedly installed on the end face of the welding table (2). Multiple elastic support components (72) are installed on the side wall of the positioning seat (71). A frame (73) is fixedly installed on the end face of the welding table (2). A hydraulic cylinder (74) is fixedly inserted on the end face of the frame (73). A pressure plate (75) is fixedly installed on the telescopic end of the hydraulic cylinder (74). The hydraulic cylinder (74) is electrically connected to the control cabinet (1).

5. The novel laser welding apparatus for battery casings according to claim 2, characterized in that, Both of the aforementioned rotating support mechanisms (8) include a U-shaped frame (81) fixedly installed at the telescopic end of the horizontal push electric push rod (43). The U-shaped frame (81) is rotatably connected to a rotating column (82). A motor drive assembly (83) is installed on the end face of the U-shaped frame (81), and the motor drive assembly (83) is used to drive the rotating column (82) to rotate. The laser welding head (3) is fixedly inserted through the rotating column (82) on the same side, and the laser emitting end of the laser welding head (3) extends to the outside of the rotating column (82). The control cabinet (1) controls the operation of the laser welding head (3). The roller (5) is rotatably connected to the mounting bracket (84), and a pressure sensor (85) is fixedly installed on the side wall of the mounting bracket (84). The pressure sensor (85) is fixedly installed on the side wall of the rotating column (82) on the same side. The control cabinet (1) controls the corresponding horizontal push electric push rod (43) to work according to the electrical signal fed back by the pressure sensor (85). One of the rotating columns (82) is provided with an oil injection assembly (9), and the roller (5) is provided with an oiling assembly (10). The oil injection assembly (9) and the oiling assembly (10) are connected.

6. The novel laser welding apparatus for battery casings according to claim 5, characterized in that, The oil injection assembly (9) includes a vertical electric push rod (91) disposed on one side of the roller (5), and an oil storage chamber (92) is provided inside the rotating column (82) on the same side as the vertical electric push rod (91). A piston (93) is slidably connected inside the oil storage chamber (92), and the oil storage chamber (92) is filled with protective oil at the position above the piston (93). The vertical electric push rod (91) is fixedly inserted into the lower cavity wall of the oil storage chamber (92), and the telescopic end of the vertical electric push rod (91) is fixedly connected to the bottom of the piston (93). An oil injection hose (94) is fixedly inserted into the upper cavity wall of the oil storage chamber (92).

7. The novel laser welding apparatus for battery casings according to claim 6, characterized in that, The oiling assembly (10) includes a sponge pad (101) fixedly filled inside the roller (5). The side wall of the roller (5) is provided with a plurality of oil injection holes (102) that communicate with the pores of the sponge pad (101). The axle of the roller (5) is hollow, and the side wall of the axle of the roller (5) is provided with a plurality of connecting holes (103). Each of the connecting holes (103) communicates with the pores of the sponge pad (101). The oil injection hose (94) is connected to the inside of the axle of the roller (5).

8. The novel laser welding apparatus for battery casing according to claim 7, characterized in that, An arc-shaped plate (11) is fixedly installed on the inner side wall of the mounting bracket (84), and the arc-shaped plate (11) is sleeved on the outer side of the roller (5). An arc-shaped rubber sealing gasket (12) is fixedly installed on the inner side wall of the arc-shaped plate (11), and the inner side wall of the arc-shaped rubber sealing gasket (12) abuts against the outer side wall of the roller (5). The arc-shaped rubber sealing gasket (12) is used to prevent the protective oil from escaping through the same side oil injection hole (102).

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