Laser welding device for lithium battery pack production

Abstract

The invention relates to the technical field of batteries, in particular to a laser welding device for lithium battery pack production, which comprises a workbench, a placing plate is arranged on the middle side of the top of the workbench, supporting frames are symmetrically arranged on the rear side of the top of the workbench left and right, and a first electric sliding rail is arranged between the tops of the two supporting frames; a first electric sliding block is arranged on the first electric sliding rail in a sliding mode, a second electric sliding rail is arranged on the front side of the first electric sliding block, and a second electric sliding block is arranged on the second electric sliding rail in a sliding mode. And by designing the first electric sliding rail and the second electric sliding rail, accurate welding of the edge of the aluminum battery shell can be achieved. The laser nozzle can move up and down as required under the control of the servo motor, and meanwhile, the scraper driven by the swing frame can effectively remove granular substances generated by welding, so that the cleanness of a welding area is ensured.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a laser welding device for producing lithium battery packs. Background Art

[0002] At present, the welding of aluminum battery shells and aluminum battery covers is carried out by using special aluminum shell welding equipment. The price of replacing equipment is high, and the equipment has very strict requirements on the quality of materials used to manufacture battery shells, resulting in high cost of battery shells. In the laser welding process of aluminum battery shells and aluminum battery covers in the prior art, since the cover plate and the shell are easily misaligned, and the misalignment is large, the flatness is poor, which affects the welding quality. In addition, the heat of laser welding is high, and the sealing gasket on the battery cover is affected by the heat, and the sealing performance will be reduced. When it is reduced below the required value, it will cause low battery capacity, large internal resistance, and even short circuit.

[0003] Therefore, it is necessary to design a laser welding device for lithium battery pack production that can perform precise welding. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art in the laser welding process of aluminum battery shells and aluminum battery covers, in which the cover plate and the shell are easily misaligned, and the misalignment is relatively large, resulting in poor flatness and affecting the welding quality, the technical problem to be solved is: to provide a laser welding device for lithium battery pack production that can achieve precise welding.

[0005] The technical implementation scheme of the present invention is: a laser welding device for lithium battery pack production, including a workbench, a placement plate, a support frame, a first electric slide rail, a first electric slider, a second electric slide rail, a second electric slider, a laser welding assembly, a shielding assembly, a fixing assembly and a cleaning assembly, a placement plate is arranged on the middle side of the top of the workbench, a support frame is symmetrically arranged on the left and right sides of the rear side of the top of the workbench, a first electric slide rail is arranged between the tops of the two support frames, a first electric slider is slidably arranged on the first electric slide rail, a second electric slide rail is arranged on the front side of the first electric slider, a second electric slide rail is slidably arranged on the second electric slide rail, a laser welding assembly capable of moving up and down is arranged on the second electric slider, a shielding assembly cooperating with the laser welding assembly is arranged on the rear side of the top of the workbench, a fixing assembly capable of limiting the position of the aluminum battery pack is arranged on the top of the workbench, and a cleaning assembly capable of processing metal particles of aluminum battery covers of the aluminum battery pack is arranged on the laser welding assembly.

[0006] In one embodiment, the laser welding assembly includes a straight slide rail, a first sliding block, a screw rod, a servo motor, a fixed plate, a laser nozzle and a connecting head. The straight slide rail is vertically arranged on the second electric slider, the first sliding block is slidably arranged on the straight slide rail, the screw rod is rotatably arranged on the straight slide rail, a servo motor is arranged on the top of the straight slide rail, the output shaft of the servo motor is connected to the screw rod, a fixed plate is arranged on the first sliding block, a laser nozzle is rotatably arranged on the fixed plate, and a connecting head is arranged on the top of the laser nozzle.

[0007] In one of the embodiments, the shielding assembly includes a guide rod and a slide plate, a second sliding block, a shielding plate, an electric push rod, a U-shaped pull rod, a track and a connecting rod. The guide rod is symmetrically arranged on the left and right sides of the rear side of the top of the workbench, a slide plate is arranged between the two guide rods, the second sliding block is slidably arranged on the slide plate, the second sliding block is provided with a straight groove, and the shielding plate is symmetrically arranged in the straight groove of the second sliding block. An electric push rod is arranged at the top center of the second sliding block, and a U-shaped pull rod is arranged on the telescopic rod of the electric push rod. Both ends of the U-shaped pull rod are connected to the rear ends of the adjacent shielding plates. A track is arranged on the rear side of the top of the workbench, and a connecting rod is slidably arranged on the track, and the connecting rod is connected to the bottom of the first electric slider.

[0008] In one embodiment, the fixing assembly includes an annular groove plate, a limit baffle and an elastic member. An annular groove plate is symmetrically arranged on the top of the workbench. A limit baffle is slidably arranged between the two annular groove plates. Elastic members are arranged on the left and right sides of the side walls of the limit baffles close to each other, and the other end of the elastic member is connected to the square block in the middle of the annular groove plate.

[0009] In one embodiment, the cleaning component includes an annular groove frame, a gear ring, a mounting plate, a rotating motor, a rotating shaft, a gear, a square column, a swing frame and a scraper. The laser nozzle is rotatably provided with an annular groove frame, a gear ring is provided on the annular groove frame, a square column is provided on the annular groove frame, a swing frame is rotatably provided on the square column, a scraper is rotatably provided at the lower part of the swing frame, a mounting plate is provided on the left side of the bottom of the fixed plate, a rotating motor is provided on the mounting plate, a rotating shaft is provided on the output shaft of the rotating motor, a gear is provided at the bottom of the rotating shaft, and the gear is meshed with the gear ring.

[0010] In one of the embodiments, a pick-and-place assembly is provided on the left side of the top of the workbench, and the pick-and-place assembly includes a pick-and-place robot arm, a fixed sleeve and a dual-axis cylinder. A pick-and-place robot arm is provided on the left side of the top of the workbench, a fixed sleeve is provided at the bottom of the annular groove plate, a dual-axis cylinder is provided on the fixed sleeve, and the telescopic rod of the dual-axis cylinder is connected to the limit baffle.

[0011] In one of the embodiments, a laser welding assembly is provided with a gas filling assembly capable of cleaning the aluminum battery cover of an aluminum battery pack, the gas filling assembly includes an air jet pipe, a pipeline, an annular spray gun and an air filling pipe, the side wall of the laser nozzle is connected to the air jet pipe through a bracket, the air jet pipe is provided with a pipeline, the laser nozzle is provided with an annular spray gun, and the annular spray gun is connected to the air filling pipe.

[0012] In one of the embodiments, a counterweight is provided on the inner side of the oblique scraping surface of the scraper.

[0013] In one embodiment, a collection frame is also included, and the collection frame is placed at the bottom of the placement plate.

[0014] The beneficial effects of the present invention are:

[0015] 1. The design includes the first electric slide and the second electric slide, which can achieve accurate welding of the edge of the aluminum battery shell. The control of the servo motor allows the laser nozzle to move up and down as needed, and the scraper driven by the swing frame can effectively remove the granular materials produced by welding to ensure the cleanliness of the welding area. In addition, the design of the shielding plate not only provides a stable welding track for the edge of the aluminum battery shell, but also suppresses the shell and cover to prevent the welding quality from being affected by misalignment. This design significantly improves the accuracy and efficiency of welding and ensures the consistency of welding quality.

[0016] 2. During the welding process, the system provides shielding gas through an external air pump and fully covers the welding area through a ring-shaped spray gun, effectively preventing the problem of internal voids in the weld caused by insufficient shielding gas, high hydrogen content in the material, or too fast welding speed. At the same time, through the coordinated movement of the first electric slider and the second slider, the laser nozzle can easily weld the different edges of the aluminum battery casing along the track on the shielding plate. The retraction function of the dual-axis cylinder further ensures the stability and position accuracy of the aluminum battery casing during the welding process. In addition, the design of the collection frame also facilitates the collection of particulate matter generated during the welding process, keeping the working environment clean. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0018] Figure 2 It is a partial three-dimensional structural schematic diagram of the present invention.

[0019] Figure 3 It is a schematic diagram of the three-dimensional structure of the laser welding assembly of the present invention.

[0020] Figure 4 It is a schematic diagram of the installation structure of the shielding assembly of the present invention.

[0021] Figure 5It is a schematic diagram of the three-dimensional structure of the shielding component of the present invention.

[0022] Figure 6 It is a schematic diagram of the installation structure of the cleaning component and the aeration component of the present invention.

[0023] Figure 7 It is a schematic diagram of the three-dimensional structure of the cleaning component of the present invention.

[0024] Figure 8 It is a schematic diagram of the installation structure of the pick-and-place assembly of the present invention.

[0025] Fig. 9 It is a schematic diagram of the three-dimensional structure of the pick-and-place assembly of the present invention.

[0026] Description of the accompanying drawings: 1_workbench, 2_placing plate, 3_support frame, 4_first electric slide rail, 5_first electric slider, 6_second electric slide rail, 7_second electric slider, 8_laser welding assembly, 81_straight slide rail, 82_first sliding block, 83_screw rod, 84_servo motor, 85_fixed plate, 86_laser nozzle, 87_connecting head, 9_shielding assembly, 91_guide rod, 92_slide plate, 93_second sliding block, 94_shielding plate, 95_electric push rod, 96_U-shaped pull rod, 97_track, 98_connecting rod, 10_ Fixed assembly, 101_annular groove plate, 102_limit baffle, 103_elastic part, 11_cleaning assembly, 111_annular groove frame, 112_gear ring, 113_mounting plate, 114_rotating motor, 115_rotating shaft, 116_gear, 117_square column, 118_swing frame, 119_scraper, 12_pick and place assembly, 121_pick and place mechanical arm, 122_fixing sleeve, 123_dual-axis cylinder, 13_gas filling assembly, 131_injection pipe, 132_pipeline, 133_annular spray gun, 134_inflating pipe, 14_collection frame. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0028] Example: Figure 1-9As shown, a laser welding device for lithium battery pack production includes a workbench 1, a placement plate 2, a support frame 3, a first electric slide rail 4, a first electric slider 5, a second electric slide rail 6, a second electric slider 7, a laser welding assembly 8, a shielding assembly 9, a fixing assembly 10, a cleaning assembly 11, a pick-and-place assembly 12, and a gas filling assembly 13. The placement plate 2 is provided on the middle side of the top of the workbench 1 by bolt connection, and the support frame 3 is provided on the left and right sides of the top rear side of the workbench 1 symmetrically by bolt connection. The first electric slide rail 4 is provided between the tops of the two support frames 3 by bolt connection. The first electric slider 5 is slidably provided on the first electric slide rail 4, and the second electric slide rail 6 is provided on the front side of the first electric slider 5. 6 is slidably provided with a second electric slider 7, and a laser welding assembly 8 that can move up and down is provided on the second electric slider 7. The laser welding assembly 8 includes a straight slide rail 81, a first sliding block 82, a screw rod 83, a servo motor 84, a fixed plate 85, a laser nozzle 86 and a connecting head 87. A straight slide rail 81 is vertically provided on the second electric slider 7, a first sliding block 82 is slidably provided on the straight slide rail 81, a screw rod 83 is rotatably provided on the straight slide rail 81, a servo motor 84 is provided on the top of the straight slide rail 81, and the output shaft of the servo motor 84 is connected to the screw rod 83, a fixed plate 85 is provided on the first sliding block 82, a laser nozzle 86 is rotatably provided on the fixed plate 85, a connecting head 87 is provided on the top of the laser nozzle 86, and a connecting head 87 is provided. The head 87 is connected to the laser nozzle 86 through a line. A shielding assembly 9 that cooperates with the laser welding assembly 8 is arranged on the rear side of the top of the workbench 1. The shielding assembly 9 includes a guide rod 91 and a slide plate 92, a second sliding block 93, a shielding plate 94, an electric push rod 95, a U-shaped pull rod 96, a track 97 and a connecting rod 98. A guide rod 91 is symmetrically arranged on the left and right sides of the top rear side of the workbench 1. A slide plate 92 is arranged between the two guide rods 91. A second sliding block 93 is slidably arranged on the slide plate 92. A straight groove is opened on the second sliding block 93. Shielding plates 94 are symmetrically arranged in the straight groove of the second sliding block 93. An electric push rod 95 is arranged at the top center of the second sliding block 93. A U-shaped pull rod 96 is arranged on the telescopic rod of the electric push rod 95. The U-shaped pull rod 96 are connected to the rear ends of the adjacent shielding plates 94, a track 97 is provided on the rear side of the top of the workbench 1, a connecting rod 98 is slidably provided on the track 97, and the connecting rod 98 is connected to the bottom of the first electric slider 5, and a fixing assembly 10 capable of limiting the position of the aluminum battery pack is provided on the top of the workbench 1, and the fixing assembly 10 includes an annular groove plate 101, a limiting baffle 102 and an elastic member 103, and an annular groove plate 101 is symmetrically provided on the top of the workbench 1, and a limiting baffle 102 is slidably provided between the two annular groove plates 101, and elastic members 103 are provided on the left and right sides of the side walls of the limiting baffle 102 close to each other, and the elastic member 103 is a compression spring, and the other end of the elastic member 103 is connected to the square block in the middle of the annular groove plate 101,The laser welding assembly 8 is provided with a cleaning assembly 11 capable of processing metal particles of aluminum battery cover of aluminum battery pack, and the cleaning assembly 11 includes an annular groove frame 111, a gear ring 112, a mounting plate 113, a rotating motor 114, a rotating shaft 115, a gear 116, a square column 117, a swing frame 118 and a scraper 119. The laser nozzle 86 is rotatably provided with an annular groove frame 111, a gear ring 112 is provided on the annular groove frame 111, a square column 117 is provided on the annular groove frame 111, a swing frame 118 is rotatably provided on the square column 117, a scraper 119 is rotatably provided at the lower part of the swing frame 118, and a counterweight is provided on the inner side of the oblique scraping surface of the scraper 119, a mounting plate 113 is provided on the left side of the bottom of the fixed plate 85, a rotating motor 114 is provided on the mounting plate 113, a rotating shaft 115 is provided on the output shaft of the rotating motor 114, and a gear 116 is provided at the bottom of the rotating shaft 115. The gear 116 Meshing with the gear ring 112, a pick-and-place assembly 12 is arranged on the left side of the top of the workbench 1, and the pick-and-place assembly 12 includes a pick-and-place mechanical arm 121, a fixed sleeve 122 and a double-axis cylinder 123. A pick-and-place mechanical arm 121 is arranged on the left side of the top of the workbench 1, a fixed sleeve 122 is arranged at the bottom of the annular groove plate 101, and a double-axis cylinder 123 is arranged on the fixed sleeve 122. The telescopic rod of the double-axis cylinder 123 is connected to the limit baffle 102, and the collection frame 14 is placed on the placement plate 2 At the bottom, the laser welding assembly 8 is provided with an aeration assembly 13 capable of cleaning the aluminum battery cover of the aluminum battery pack. The aeration assembly 13 includes an air jet pipe 131, a pipeline 132, an annular spray gun 133 and an air charging pipe 134. The side wall of the laser nozzle 86 is connected to the air jet pipe 131 through a bracket. The air jet pipe 131 is provided with a pipeline 132. The laser nozzle 86 is provided with an annular spray gun 133. The annular spray gun 133 is connected to the air charging pipe 134.

[0029] When welding is required, the pick-and-place mechanical arm 121 clamps the aluminum battery shell to be welded, and then the pick-and-place mechanical arm 121 rotates to drive the aluminum battery shell to be placed on the placement plate 2, and then the first electric slide rail 4 is controlled, the first electric slider 5 of the first electric slide rail 4 can move left and right, and the second electric slider 7 of the second electric slide rail 6 can move forward and backward, so that the edge of the aluminum battery shell can be welded, and the servo motor 84 is controlled to rotate, and the servo motor 84 drives the screw rod 83 to rotate, and the first sliding block 82 drives The movable fixed plate 85 and the laser nozzle 86 move downward, the swing frame 118 on the square column 117 rotates to drive the scraper 119 to contact the aluminum battery shell, the scraper 119 enters between the two shielding plates 94 to form a gap, the aluminum battery shell is flush, and the laser nozzle 86 welds the side wall of the aluminum battery shell. Since the shielding plate 94 can form a welding track 97 facing the edge of the aluminum battery shell, the shielding plate 94 presses the aluminum battery shell and the cover plate to prevent dislocation and large dislocation from affecting the welding quality. The beveled scraping surface of the scraper 119 can scrape off the particles produced by welding, and the gas is pumped into the pipeline 132 and the jet pipe 131 through an external air pump to blow away the dust on the aluminum battery casing. The gas is pumped into the inflation pipe 134 through an external air pump and sprayed out through the annular spray gun 133 to increase the flow rate of the protective gas, ensure that the welding area is fully covered, and prevent the formation of voids inside the weld due to insufficient protective gas, high hydrogen content in the material, and too fast welding speed. When the aluminum battery casing needs to be welded forward along the edge of the aluminum battery casing, move to the right to weld after one edge is welded. Then, the first electric slider 5 is moved left and right on the first electric slide rail 4, and the first electric slider 5 drives the second slide block 93 to move through the connecting rod 98, and the second slide block 93 drives the shielding plate 94 to move synchronously, and the laser nozzle 86 welds the transverse edge of the front side of the aluminum battery shell through the track 97 on the shielding plate 94. When welding the transverse edge of the rear side of the aluminum battery shell, the shielding plate 94 is driven backward by the cylinder through the U-shaped pull rod 96, and the track 97 of the shielding plate 94 moves backward to the transverse edge of the rear side of the aluminum battery shell, which is beneficial to the welding of the laser nozzle 86, and the collection frame 14 is used to collect particulate matter under the placement plate 2. When the pick-and-place mechanical arm 121 rotates to place the aluminum battery shell, the double-axis cylinder 123 is contracted, and the double-axis cylinder 123 drives the limit baffle 102 to squeeze and limit the aluminum battery to ensure that the aluminum battery is placed straight.

[0030] It should be understood that the above description is only for exemplary purposes and is not meant to limit the present invention. Those skilled in the art will appreciate that variations of the present invention will be included within the scope of the claims herein.

Claims

1. A laser welding device for lithium battery production, characterized in that: The invention comprises a workbench (1), wherein a placing plate (2) is arranged at the middle side of the top of the workbench (1), a support frame (3) is symmetrically arranged at the left and right sides of the rear side of the top of the workbench (1), a first electric slide rail (4) is arranged between the tops of the two support frames (3), a first electric slider (5) is slidably arranged on the first electric slide rail (4), a second electric slide rail (6) is arranged at the front side of the first electric slider (5), a second electric slider (7) is slidably arranged on the second electric slide rail (6), a laser welding component (8) capable of moving up and down is arranged on the second electric slider (7), a shielding component (9) cooperating with the laser welding component (8) is arranged at the rear side of the top of the workbench (1), a fixing component (10) capable of limiting the position of an aluminum battery pack is arranged at the top of the workbench (1), and a cleaning component (11) capable of processing metal particles of an aluminum battery cover of an aluminum battery pack is arranged on the laser welding component (8).

2. A laser welding device for lithium battery production according to claim 1, characterized in that: The laser welding assembly (8) comprises a straight slide rail (81), the straight slide rail (81) is vertically arranged on the second electric slider (7), a first slide block (82) is slidably arranged on the straight slide rail (81), a screw rod (83) is rotatably arranged on the straight slide rail (81), a servo motor (84) is arranged on the top of the straight slide rail (81), the output shaft of the servo motor (84) is connected to the screw rod (83), a fixing plate (85) is arranged on the first slide block (82), a laser nozzle (86) is rotatably arranged on the fixing plate (85), and a connecting head (87) is arranged on the top of the laser nozzle (86).

3. A laser welding device for lithium battery production according to claim 2, characterized in that the shielding The component (9) comprises a guide rod (91), the guide rod (91) is symmetrically arranged on the left and right sides of the top rear side of the workbench (1), a slide plate (92) is arranged between the two guide rods (91), a second sliding block (93) is slidably arranged on the slide plate (92), a straight groove is opened on the second sliding block (93), a shielding plate (94) is symmetrically arranged in the straight groove of the second sliding block (93), an electric push rod (95) is arranged at the top center of the second sliding block (93), a U-shaped pull rod (96) is arranged on the telescopic rod of the electric push rod (95), and the two ends of the U-shaped pull rod (96) are connected to the rear ends of the adjacent shielding plates (94), a track (97) is arranged on the top rear side of the workbench (1), a connecting rod (98) is slidably arranged on the track (97), and the connecting rod (98) is connected to the bottom of the first electric slider (5).

4. A laser welding device for lithium battery production according to claim 3, characterized in that: The fixing assembly (10) comprises an annular groove plate (101), the annular groove plates (101) are symmetrically arranged on the top of the workbench (1), a limit baffle (102) is slidably arranged between the two annular groove plates (101), and elastic members (103) are arranged on the left and right sides of the side walls of the limit baffle (102) close to each other, and the other end of the elastic member (103) is connected to the square block in the middle of the annular groove plate (101).

5. A laser welding device for producing lithium battery packs according to claim 4, characterized in that: The cleaning component (11) comprises an annular groove frame (111), the annular groove frame (111) is rotatably arranged on the laser nozzle (86), a gear ring (112) is arranged on the annular groove frame (111), a square column (117) is arranged on the annular groove frame (111), a swing frame (118) is rotatably arranged on the square column (117), a scraper (119) is rotatably arranged at the lower part of the swing frame (118), a mounting plate (113) is arranged on the left side of the bottom of the fixed plate (85), a rotating motor (114) is arranged on the mounting plate (113), a rotating shaft (115) is arranged on the output shaft of the rotating motor (114), a gear (116) is arranged at the bottom of the rotating shaft (115), and the gear (116) is meshed with the gear ring (112).

6. A laser welding device for producing lithium battery packs according to claim 5, characterized in that: A pick-and-place assembly (12) is arranged on the left side of the top of the workbench (1), and the pick-and-place assembly (12) includes a pick-and-place mechanical arm (121). The pick-and-place mechanical arm (121) is arranged on the left side of the top of the workbench (1), and a fixing sleeve (122) is arranged on the bottom of the annular groove plate (101). A double-axis cylinder (123) is arranged on the fixing sleeve (122), and a telescopic rod of the double-axis cylinder (123) is connected to the limit baffle (102).

7. A laser welding device for producing lithium battery packs according to claim 6, characterized in that: The laser welding assembly (8) is provided with an aeration assembly (13) capable of cleaning the aluminum battery cover of the aluminum battery pack. The aeration assembly (13) includes an air jet pipe (131). The side wall of the laser nozzle (86) is connected to the air jet pipe (131) via a bracket. The air jet pipe (131) is provided with a pipeline (132). The laser nozzle (86) is provided with an annular spray gun (133). The annular spray gun (133) is connected to an air filling pipe (134).

8. A laser welding device for producing lithium battery packs according to claim 7, characterized in that: A counterweight block is arranged on the inner side of the oblique scraping surface of the scraper (119).

9. A laser welding device for producing lithium battery packs according to claim 8, characterized in that: It also includes a collection frame (14), which is placed at the bottom of the placement plate (2).

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