A laser welding device for a new battery case

Abstract

The application belongs to the technical field of laser welding, and particularly relates to a novel laser welding device for a battery shell, which comprises a control cabinet and a welding table fixedly installed on the top of the control cabinet, a laser welding head is arranged above the welding table, and further comprises a supporting displacement unit installed on the top of the welding table, which is used for driving the laser welding head to move along the joint of the battery shell; a 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 joint of the battery shell. The application can effectively discharge residual air in the welding seam, reduce defects such as pores, improve the density and mechanical properties of the welding seam, inhibit the bulging deformation of the welding seam, avoid assembly interference, prevent high-temperature oxidation by blowing inert gas, assist the cooling and shaping of the welding seam, and temporarily protect the welding seam after welding to reduce the degree of oxidation.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of laser welding, and particularly relates to a laser welding device for a novel battery shell. BACKGROUND

[0002] The aluminum shell of a new energy automobile battery needs to consider light weight and safety. Laser welding is widely used in the welding of the cover plate and the outer frame of the battery shell due to its high precision and deep penetration welding characteristics. It can achieve millimeter-level accurate positioning and form a dense weld to ensure the air tightness and structural strength of the shell, effectively solving the problems of insufficient penetration and large deformation in traditional welding, and meeting the high reliability and large-scale production requirements of the battery.

[0003] For example, a laser welding device for a power battery shell disclosed in patent publication No. CN118287827A is used to weld the cover plate of a rectangular battery shell along the joint between the cover plate and the outer frame after the cover plate is assembled with the outer frame.

[0004] Due to the physical properties of aluminum, such as high reflectivity and fast heat conduction, the molten pool solidification speed is fast under high-speed welding process, and the gas in the molten pool cannot escape in time, which is easy to form internal defects such as pores and slag, affecting the density of the weld. In addition, the existing clamping mechanism usually fixes the cover plate on the outer frame through vertical pressure, and the vertical clamping force will produce a transverse extrusion effect on the weld area, causing the weld material to bulge outward. If the weld bulges too much, it may interfere with other components during the subsequent battery assembly process, affecting the overall assembly precision and structural reliability. SUMMARY

[0005] The purpose of the present application is to solve the above problems, and provide a laser welding device for a novel battery shell.

[0006] To achieve the above purpose, the following technical scheme is adopted: a laser welding device for a novel battery shell, comprising a control cabinet and a welding table fixedly installed on the top of the control cabinet, a laser welding head is arranged above the welding table, and the laser welding device further comprises:

[0007] A support displacement unit is installed on the 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 shell;

[0008] A roller is arranged on one side of the support displacement unit, and the support displacement unit is used to drive the roller to roll along the joint of the battery shell;

[0009] A gas jet protection unit is installed on the end face of the welding table, and the gas jet protection unit is used to jet inert gas to the joint of the battery shell;

[0010] A positioning and clamping unit is installed on the top of the welding table and used for pressing and fixing the battery shell.

[0011] Preferably, the support and displacement unit comprises a support seat fixedly installed on the top of the welding table, a rotating seat rotatably connected to the upper end of the outer sidewall of the support seat, two horizontal push electric push rods fixedly inserted into the sidewall of the rotating seat, and two rotating support mechanisms installed at the telescopic ends of the two horizontal push electric push rods. One of the rotating support mechanisms is used for supporting the laser welding head, and the other rotating support mechanism is used for supporting the roller. A motor driving assembly is installed on the outer sidewall of the support seat and used for driving the rotating seat to rotate. The two horizontal push electric push rods and the motor driving assembly are electrically connected to the control cabinet.

[0012] Preferably, the air jet protection unit comprises an annular air cavity formed in the support seat, a plurality of electric nozzles fixedly inserted into the inner sidewall of the annular air cavity, and an air injection pipe fixedly connected to the annular air cavity and having an output end of a machine pump in the control cabinet in communication therewith. The machine pump is used for conveying inert gas into the annular air cavity through the air injection pipe. The machine pump is electrically connected to the control cabinet.

[0013] Preferably, the positioning and clamping unit comprises a positioning seat fixedly installed on the end face of the welding table, a plurality of elastic support assemblies installed on the sidewall of the positioning seat, a rack fixedly installed on the end face of the welding table, a hydraulic cylinder fixedly inserted into the end face of the rack, and a pressing plate fixedly installed at the telescopic end of the hydraulic cylinder. The hydraulic cylinder is electrically connected to the control cabinet.

[0014] Preferably, each of the two rotating support mechanisms comprises a U-shaped frame fixedly installed at the telescopic end of the horizontal push electric push rod, a rotating column rotatably connected to the U-shaped frame, and a motor driving assembly installed on the end face of the U-shaped frame and used for driving the rotating column to rotate. The laser welding head is fixedly inserted into the same side rotating column, and the laser emission end of the laser welding head extends to the outside of the rotating column. The control cabinet controls the work of the laser welding head. The roller is rotatably connected to a mounting rack, and a pressure sensor is fixedly installed on the sidewall of the same side rotating column. The control cabinet controls the work of the corresponding horizontal push electric push rod according to the electrical signal fed back by the pressure sensor. An oil injection assembly is arranged in the inside of one of the rotating columns, and an oil coating assembly is arranged in the inside of the roller. The oil injection assembly and the oil coating assembly are in communication.

[0015] Preferably, the oil injection assembly comprises a vertical push electric push rod arranged on one side of the roller, and a rotating column on the same side of the vertical push electric push rod is internally provided with an oil storage cavity, a piston is slidably connected in the oil storage cavity, and the inside of the oil storage cavity is filled with protective oil above the piston, the vertical push electric push rod is fixedly inserted into the lower cavity wall of the oil storage cavity, and the telescopic end of the vertical push electric push rod is fixedly connected with the bottom of the piston, and the upper cavity wall of the oil storage cavity is fixedly inserted with an oil injection hose.

[0016] Preferably, the oil injection assembly comprises a vertical push electric push rod arranged on one side of the roller, and a rotating column on the same side of the vertical push electric push rod is internally provided with an oil storage cavity, a piston is slidably connected in the oil storage cavity, and the inside of the oil storage cavity is filled with protective oil above the piston, the vertical push electric push rod is fixedly inserted into the lower cavity wall of the oil storage cavity, and the telescopic end of the vertical push electric push rod is fixedly connected with the bottom of the piston, and the upper cavity wall of the oil storage cavity is fixedly inserted with an oil injection hose.

[0017] Preferably, the inner side wall of the mounting frame is fixedly provided with an arc-shaped plate, and the arc-shaped plate is sleeved on the outer side of the roller, the inner side wall of the arc-shaped plate is fixedly provided with an arc-shaped rubber sealing gasket, and the inner side wall of the arc-shaped rubber sealing gasket abuts against the outer side wall of the roller, and the arc-shaped rubber sealing gasket is used for preventing the protective oil from escaping through the oil injection hole on the same side.

[0018] Compared with the prior art, the laser welding device for a new battery shell has the following advantages:

[0019] 1. By the cooperation of the control cabinet, the welding table, the laser welding head and the supporting displacement unit, the outer frame and the cover plate of the rectangular battery aluminum shell can be laser welded, and the supporting displacement unit cooperated with the roller can extrude the laser-melted weld, so that the residual air in the weld can be effectively discharged, the defects such as pores are reduced, the coarse columnar crystals are broken and the grains are refined, the weld density and mechanical properties are improved, the weld bulging deformation caused by clamping force is inhibited, the subsequent assembly interference is avoided, and the comprehensive improvement of the weld quality is realized.

[0020] 2. By the jet protection unit, inert gas can be sprayed on the just-welded weld, which can avoid the oxidation of the high-temperature weld and affect the weld quality, and can promote the weld to cool and set.

[0021] 3. By the oil injection assembly and the oil coating assembly, a layer of protective oil can be applied on the surface of the laser weld after welding, so that the weld can be temporarily protected from oxidation after welding, the oxidation degree of the weld is further reduced, and the quality of the battery shell is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic view of a laser welding device for a new battery shell provided by the application.

[0023] Figure 2 is a top view structural schematic diagram of a rotating seat of a laser welding device of a new battery shell provided by the present application;

[0024] Figure 3 is a connection structure schematic diagram of a laser welding head and a rotating support mechanism of a laser welding device of a new battery shell provided by the present application;

[0025] Figure 4 is a connection structure schematic diagram of a roller and a rotating support mechanism of a laser welding device of a new battery shell provided by the present application;

[0026] Figure 5 is a connection structure schematic diagram of a laser welding device of a new battery shell provided by the present application; Figure 2 is a structure enlarged view of part A of the above;

[0027] Figure 6 is a connection structure schematic diagram of a pressing plate and a rack of a laser welding device of a new battery shell provided by the present application;

[0028] Figure 7 is a sectional view structural schematic diagram of a support seat of a laser welding device of a new battery shell provided by the present application;

[0029] Figure 8 is a structure schematic diagram of an oil injection assembly of a laser welding device of a new battery shell provided by the present application;

[0030] Figure 9 is a structure schematic diagram of an oil coating assembly of a laser welding device of a new battery shell provided by the present application.

[0031] In the figure: 1 control cabinet, 2 welding table, 3 laser welding head, 4 support displacement unit, 41 support seat, 42 rotating seat, 43 horizontal push electric push rod, 44 motor drive assembly, 5 roller, 6 air jet protection unit, 61 annular air cavity, 62 electric nozzle, 63 machine pump, 64 air injection pipe, 7 positioning clamping unit, 71 positioning seat, 72 elastic support assembly, 73 rack, 74 hydraulic cylinder, 75 pressing plate, 8 rotating support mechanism, 81 U-shaped frame, 82 rotating column, 83 motor drive assembly, 84 mounting rack, 85 pressure sensor, 9 oil injection assembly, 91 vertical push electric push rod, 92 oil storage cavity, 93 piston, 94 oil injection hose, 10 oil coating assembly, 101 sponge pad, 102 oil injection hole, 103 communication hole, 11 arc-shaped plate, 12 arc-shaped rubber sealing pad. DETAILED DESCRIPTION

[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] The roller 5 is arranged on one side of the support displacement unit 4, the support displacement unit 4 is used for driving the roller 5 to roll along the battery shell joint, the jet protection unit 6 is installed on the end face of the welding table 2, the jet protection unit 6 is used for blowing inert gas to the battery shell joint, the jet protection unit 6 comprises an annular air cavity 61 which is arranged in the support seat 41, a plurality of electric nozzles 62 are fixedly inserted into the inner side cavity wall of the annular air cavity 61, and the gas outlet ends of the electric nozzles 62 are all directed to the battery shell joint, a machine pump 63 is fixedly installed in the inside of the control cabinet 1, and the output end of the machine pump 63 is fixedly communicated with a gas injection pipe 64 which is communicated with the annular air cavity 61, the machine pump 63 transports inert gas into the inside of the annular air cavity 61 through the gas injection pipe 64, and the machine pump 63 is electrically connected with the control cabinet 1, and the gas suction end of the machine pump 63 is communicated with an external inert gas storage tank.

[0035] The positioning and clamping unit 7 is installed on the top of the welding table 2, and is used for tightly fixing the battery shell, the positioning and clamping unit 7 comprises a positioning seat 71 which is fixedly installed on the end face of the welding table 2, a plurality of elastic support assemblies 72 are installed on the side wall of the positioning seat 71, a rack 73 is fixedly installed on the end face of the welding table 2, a hydraulic cylinder 74 is fixedly inserted into the end face of the rack 73, a pressing plate 75 is fixedly installed on the telescopic end of the hydraulic cylinder 74, and the hydraulic cylinder 74 is electrically connected with the control cabinet 1, the elastic support assembly 72 comprises an elastic member and a positioning block, the positioning block is installed in the positioning groove in the side wall of the positioning seat 71 through the elastic member, after the outer frame of the battery shell is inserted outside the positioning seat 71, the positioning block is abutted with the inner wall of the outer frame under the support of the elastic member, so that the outer frame is positioned.

[0036] The inside of one of the rotating columns 82 is provided with an oil injection assembly 9, the oil injection assembly 9 comprises a vertical electric push rod 91 which is arranged on one side of the roller 5, an oil storage cavity 92 is arranged in the inside of the rotating column 82 which is on the same side of the vertical electric push rod 91, a piston 93 is slidably connected in the inside of the oil storage cavity 92, the inside of the oil storage cavity 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 cavity 92, the telescopic end of the vertical electric push rod 91 is fixedly connected with the bottom of the piston 93, an oil injection hose 94 is fixedly inserted into the upper cavity wall of the oil storage cavity 92, and the top of the oil storage cavity 92 is provided with an oil filling hole, a plugging column is threadedly connected with the hole, and the oil filling hole is used for adding protective oil into the inside of the oil storage cavity 92, a liquid level sensor can be installed in the inside of the oil storage cavity 92, and the liquid level sensor is electrically connected with the control cabinet 1, so as to remind personnel to add protective oil in time, and the protective oil adopts high-temperature-resistant silicon-based protective oil, graphene modified protective oil and the like.

[0037] The inside of the roller 5 is provided with an oil coating assembly 10, and the oil injection assembly 9 is communicated with the oil coating assembly 10, the oil coating assembly 10 comprises a sponge pad 101 fixedly filled in the inside of the roller 5, a plurality of oil injection holes 102 communicated with the pores of the sponge pad 101 are formed in the side wall of the roller 5, the axle of the roller 5 is hollow, a plurality of communication holes 103 are formed in the side wall of the axle of the roller 5, each communication hole 103 is communicated with the pores of the sponge pad 101, the oil injection hose 94 is communicated with the inside of the axle of the roller 5, the inner side wall of the mounting frame 84 is fixedly installed with an arc-shaped plate 11, the arc-shaped plate 11 is sleeved on the outer side of the roller 5, the inner side wall of the arc-shaped plate 11 is fixedly installed with an arc-shaped rubber sealing gasket 12, and the inner side wall of the arc-shaped rubber sealing gasket 12 abuts against the outer side wall of the roller 5, and the arc-shaped rubber sealing gasket 12 is used for preventing the protective oil from escaping through the oil injection hole 102 on the same side.

[0038] The operation principle of the present application is described as follows: the outer frame and the cover plate of the rectangular battery outer frame are sequentially placed at the positioning seat 71 (refer to Figure 1 , Figure 1 The dashed part in the middle is the outer frame and the cover plate of the battery shell, and the dashed arrow is the installation direction), the outer frame is positioned by the elastic supporting assembly 72 (the elastic supporting assembly 72 comprises an elastic member and a positioning block, the positioning block is installed in the positioning groove in the side wall of the positioning seat 71 through the elastic member, after the outer frame is inserted to the outer side of the positioning seat 71, the positioning block abuts against the inner wall of the outer frame under the supporting action of the elastic member, so that the positioning effect of the outer frame is achieved) of the side wall of the positioning seat 71, and then the control cabinet 1 is started.

[0039] After the control cabinet 1 is started, the hydraulic cylinder 74 will immediately perform a timed extension action, the hydraulic cylinder 74 will drive the pressing plate 75 to move downward, and after the timed work of the hydraulic cylinder 74 is completed, the pressing plate 75 will press the cover plate of the battery shell on the top of the outer frame, then the control cabinet 1 will control the motor driving assembly 44 to work, the motor driving assembly 44 will drive the rotating seat 42 to start rotating (the motor driving assembly 44 comprises a motor, a gear transmission assembly, a shaft coupling and other components), the rotating seat 42 will drive the two horizontal push electric push rods 43 to work, at the same time, the control cabinet 1 controls the horizontal push electric push rod 43, the laser welding head 3 and the motor driving assembly 83 to work according to the preset program, the horizontal push electric push rod 43 can control the distance between the laser welding head 3 and the battery shell through the U-shaped frame 81 and the rotating column 82, and the motor driving assembly 83 can adjust the angle of the rotating column 82 (the motor driving assembly 83 comprises a motor, a gear transmission assembly, a shaft coupling and other components), and since the rotating seat 42 starts to rotate at this time, the laser welding head 3 will move along the joint between the outer frame and the cover plate of the battery shell under the cooperation of the horizontal push electric push rod 43 and the motor driving assembly 83, so that the outer frame and the cover plate of the battery shell can be welded by the laser welding head 3.

[0040] Similarly, the roller 5 can also move along the joint between the outer frame and the cover plate of the battery shell (the distance between the roller 5 and the laser welding head 3 is about 5 cm), and since the weld just melts under the high temperature of the laser, and the horizontal push electric push rod 43 on the same side of the roller 5 will apply pressure to the roller 5 through the pressure sensor 85 and the mounting bracket 84, therefore, when the roller 5 moves along the weld, the roller 5 will apply pressure to the weld, on the one hand, due to the pressure applied by the roller 5, the air remaining in the weld can quickly escape, and under the extrusion force, the air holes will be extruded and closed, thereby effectively improving the fusion completeness of the weld, increasing the strength of the weld, on the other hand, due to the pressure applied by the roller 5 to the weld, the weld cannot over-expand outward, thereby avoiding the interference of the expanded weld with the subsequent assembly (wherein, due to the difference between the joint of the outer frame and the cover plate of each battery shell, the melting state of the weld 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 by the roller 5 to the weld is kept in a suitable state, avoiding that the pressure is too large or too small to affect the shaping effect of the weld, the pressure threshold can be preset according to the size of the joint between the outer frame and the cover plate of the battery shell), when the rotating seat 42 rotates 360°, the control cabinet 1 controls the laser welding head 3 to stop working, completing the full-circle welding of the outer frame and the cover plate of the battery shell, when the rotating seat 42 rotates 370°, the control cabinet 1 controls the motor drive assembly 44 to pause working;

[0041] When the control cabinet 1 controls the motor drive assembly 44 to pause working, the control cabinet 1 will first control the motor drive assembly 44 to drive the rotating seat 42 to rotate reversely, starting to rotate back to the original position, at the same time, the control cabinet 1 will control the vertical push electric push rod 91 to drive the piston 93 to move upward at a constant speed, when the piston 93 moves upward, it will extrude the protective oil inside the oil storage cavity 92, at this time, the protective oil will enter the inside of the sponge pad 101 through the oil injection hose 94 and the axle of the roller 5, under the action of oil pressure, the protective oil will escape through the oil injection hole 102 on the side wall of the roller 5, since the rotating seat 42 drives the roller 5 to start to move back to the original position, the roller 5 will move back along the weld which has been welded, at this time, the protective oil discharged through the oil injection hole 102 will be applied to the weld, thereby temporarily sealing the weld with the protective oil, reducing the contact between the weld and the external air, thereby reducing the degree of oxidation of the weld (wherein, since the oil injection holes 102 on the side of the roller 5 close to the arc-shaped plate 11 are all sealed by the arc-shaped rubber sealing pad 12, therefore, the protective oil can only escape through the oil injection holes 102 on the side close to the weld, avoiding the waste of protective oil), when the rotating seat 42, the laser welding head 3, the roller 5 and other components move back to the original position, the welding of a single battery shell is completed;

[0042] Wherein, at the beginning of welding, the control cabinet 1 will control each electric nozzle 62 to open in turn according to the program (for example, the first electric nozzle 62 opens first, then the second electric nozzle 62 opens, and so on, until all the electric nozzles 62 open),Figure 2 For example, the initially opened electric nozzle 62 is located at the lower left corner arc position of the support seat 41, that is, the electric nozzle 62 sprays gas to blow to the weld after being pressed by the roller 5, avoiding affecting the pressing of the roller 5 on the weld and affecting the quality of laser welding, and at the same time, the control cabinet 1 controls the machine pump 63 to start working (the suction end of the machine pump 63 is communicated with the inert gas tank), the machine pump 63 delivers inert gas to the inside of the annular air cavity 61 through the gas injection pipe 64, and the inert gas is sprayed out through the opened electric nozzle 62. Through the sprayed inert gas, the high-temperature weld can be prevented from being directly contacted with air to be oxidized, and the weld can be cooled and shaped, and in the process of welding, the injection power of the machine pump 63 is gradually increased from small to large to ensure the gas injection demand of each electric nozzle 62, and after the control cabinet 1 controls the motor driving assembly 44 to stop working, that is, the rotating seat 42 starts to rotate, the control cabinet 1 controls each electric nozzle 62 to be closed in turn according to the program, the injection power of the machine pump 63 is gradually reduced from large to small, and until the oiling work on the weld is finished. Through the double measures of gas injection and spraying protection, the contact between the weld and air can be reduced as much as possible, and the influence of weld oxidation on the quality of the weld is reduced.

[0043] The above only describes the preferred embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A novel laser welding device for battery shell, comprising a control cabinet (1) and a welding table (2) fixedly installed on the top of the control cabinet (1), and a laser welding head (3) is arranged above the welding table (2), characterized in that, Also include: Support displacement unit (4) is installed on the top of the welding table (2), the support displacement unit (4) is used for driving laser welding head (3) along the battery shell seam moves; Roller (5) is arranged on one side of the support displacement unit (4), support displacement unit (4) is used for driving roller (5) along the battery shell seam rolls; Jet protection unit (6) is installed on the end face of the welding table (2), jet protection unit (6) is used for blowing inert gas to the battery shell seam; Positioning clamping unit (7) is installed on the top of the welding table (2), positioning clamping unit (7) is used for pressing and fixing the battery shell; The support displacement unit (4) includes a support seat (41) fixedly installed on the top of the welding table (2), the outer side wall of the support seat (41) is rotatably connected with a rotating seat (42), the side wall of the rotating seat (42) is fixedly inserted with two horizontal push electric push rods (43), the telescopic ends of the two horizontal push electric push rods (43) are both installed with a rotating support mechanism (8), one of the rotating support mechanisms (8) is used for supporting the laser welding head (3), and the other rotating support mechanism (8) is used for supporting the roller (5), the outer side wall of the support seat (41) is installed with a motor drive assembly (44), the motor drive assembly (44) is used for driving the rotating seat (42) to rotate, and the two horizontal push electric push rods (43) and the motor drive assembly (44) are both electrically connected with the control cabinet (1); Both of the rotating support mechanisms (8) include a U-shaped frame (81) fixedly installed on the telescopic end of the horizontal push electric push rod (43), the U-shaped frame (81) is rotatably connected with a rotating column (82), the end face of the U-shaped frame (81) is installed with a motor drive assembly (83), and the motor drive assembly (83) is used for driving the rotating column (82) to rotate, the laser welding head (3) is fixedly penetrated through the same side rotating column (82), and the laser emission end of the laser welding head (3) extends to the outside of the rotating column (82), the control cabinet (1) controls the laser welding head (3) to work, the roller (5) is rotatably connected with a mounting frame (84), and the side wall of the mounting frame (84) is fixedly installed with a pressure sensor (85), the pressure sensor (85) is fixedly installed on the side wall of the same side rotating column (82), and the control cabinet (1) controls the corresponding horizontal push electric push rod (43) to work according to the electric signal fed back by the pressure sensor (85), one of the rotating columns (82) is provided with an oil injection assembly (9), the inside of the roller (5) is provided with an oil coating assembly (10), and the oil injection assembly (9) is communicated with the oil coating assembly (10). The oil injection assembly (9) comprises a vertical push electric push rod (91) arranged on one side of the roller (5), and a rotating column (82) is arranged on the same side of the vertical push electric push rod (91), and an oil storage cavity (92) is formed in the rotating column (82), a piston (93) is slidably connected in the oil storage cavity (92), and the oil storage cavity (92) is filled with protective oil above the piston (93), the vertical push electric push rod (91) is fixedly inserted into the lower cavity wall of the oil storage cavity (92), and the telescopic end of the vertical push electric push rod (91) is fixedly connected with the bottom of the piston (93), and the upper cavity wall of the oil storage cavity (92) is fixedly inserted with an oil injection hose (94). The oil injection assembly (9) comprises a vertical push electric push rod (91) arranged on one side of the roller (5), and a rotating column (82) is arranged on the same side of the vertical push electric push rod (91), and an oil storage cavity (92) is formed in the rotating column (82), a piston (93) is slidably connected in the oil storage cavity (92), and the oil storage cavity (92) is filled with protective oil above the piston (93), the vertical push electric push rod (91) is fixedly inserted into the lower cavity wall of the oil storage cavity (92), and the telescopic end of the vertical push electric push rod (91) is fixedly connected with the bottom of the piston (93), and the upper cavity wall of the oil storage cavity (92) is fixedly inserted with an oil injection hose (94).

2. A novel laser welding device for battery enclosure as claimed in claim 1, wherein, The jet protection unit (6) comprises an annular air cavity (61) formed in the support seat (41), a plurality of electric nozzles (62) are fixedly inserted into the inner side wall of the annular air cavity (61), and the gas outlet ends of the electric nozzles (62) are all directed to the battery shell joint, a machine pump (63) is fixedly installed in the control cabinet (1), and the output end of the machine pump (63) is fixedly communicated with the gas injection pipe (64) communicated with the annular air cavity (61), the machine pump (63) transports inert gas into the annular air cavity (61) through the gas injection pipe (64), and the machine pump (63) is electrically connected with the control cabinet (1).

3. A novel laser welding device for battery enclosure as claimed in claim 1, wherein, The positioning and clamping unit (7) comprises a positioning seat (71) fixedly installed on the end face of the welding table (2), a plurality of elastic support assemblies (72) are installed on the side wall of the positioning seat (71), a rack (73) is fixedly installed on the end face of the welding table (2), a hydraulic cylinder (74) is fixedly inserted into the end face of the rack (73), a pressing plate (75) is fixedly installed on the telescopic end of the hydraulic cylinder (74), and the hydraulic cylinder (74) is electrically connected with the control cabinet (1).

4. A novel laser welding device for battery enclosure as claimed in claim 1, wherein, The inner side wall of the mounting bracket (84) is fixedly installed with an arc-shaped plate (11), and the arc-shaped plate (11) is sleeved on the outer side of the roller (5), the inner side wall of the arc-shaped plate (11) is fixedly installed with an arc-shaped rubber sealing gasket (12), and the inner side wall of the arc-shaped rubber sealing gasket (12) abuts against the outer side wall of the roller (5), and 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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