A laser welding device for the production of lithium battery packs

Abstract

The present invention relates to the technical field of batteries, and particularly to a laser welding device for lithium battery pack production, which includes a workbench. A placement plate is arranged in the middle of the top of the workbench. On the rear side of the top of the workbench, support frames are symmetrically arranged on the left and right. Between the tops of the two support frames, a first electric slide rail is arranged. 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 slider is slidably arranged on the second electric slide rail. By designing to include the first electric slide rail and the second electric slide rail, precise welding of the edge of the aluminum battery case can be achieved. The control of the servo motor enables the laser nozzle to move up and down as needed. At the same time, the scraping shovel driven by the swing frame can effectively remove the granular substances generated during welding, ensuring the cleanliness of the welding area.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly relates to a laser welding device for the production of lithium battery packs. Background Art

[0002] At present, the welding of the aluminum battery case and the aluminum battery cover is carried out by using a special aluminum shell welding device. The cost of replacing the device is relatively high, and the device has very strict requirements on the material quality of the battery case, resulting in a high cost of the battery case. In the process of laser welding of the aluminum battery case and the aluminum battery cover in the prior art, due to the easy misalignment between the cover plate and the case, and the relatively large misalignment, the flatness is poor, affecting the welding quality. Moreover, the heat of laser welding is high, and the sealing gasket on the battery cover is affected by heat, resulting in a decrease in sealing performance. When it drops below the required value, it will cause a low battery capacity, a large internal resistance, and even a short circuit.

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

[0004] In order to overcome the defect that in the process of laser welding of the aluminum battery case and the aluminum battery cover in the prior art, due to the easy misalignment between the cover plate and the case, and the relatively large misalignment, the flatness is poor, affecting the welding quality, the technical problem to be solved is: to provide a laser welding device for the production of lithium battery packs that can perform precise welding.

[0005] The technical implementation solution of the present invention is: a laser welding device for the production of lithium battery packs, 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 in the middle of the top of the workbench, and support frames are symmetrically arranged on the left and right sides at the rear 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 slider 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 at the rear of the top of the workbench. A fixing assembly capable of limiting the lithium battery pack is arranged on the top of the workbench. A cleaning assembly capable of treating metal particles on the aluminum battery cover of the lithium 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 lead screw, a servo motor, a fixing plate, a laser nozzle, and a connector. A straight slide rail is vertically arranged on the second electric slider. A first sliding block is slidably arranged on the straight slide rail. A lead screw is rotatably arranged on the straight slide rail. A servo motor is arranged at the top of the straight slide rail. The output shaft of the servo motor is connected to the lead screw. A fixing plate is arranged on the first sliding block. A laser nozzle is rotatably arranged on the fixing plate. A connector is arranged at the top of the laser nozzle.

[0007] In one embodiment, the shielding assembly includes a guide rod, a chute plate, a second sliding block, a shielding plate, an electric push rod, a U-shaped pull rod, a track, and a connecting rod. Guide rods are symmetrically arranged on the left and right at the rear side of the top of the workbench. A chute plate is arranged between the two guide rods. A second sliding block is slidably arranged on the chute plate. A slot is formed on the second sliding block. Shielding plates are symmetrically arranged in the slot of the second sliding block. An electric push rod is arranged at the center of the top of the second sliding block. 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 at the rear side of the top of the workbench. A connecting rod is slidably arranged on the track. 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 limiting baffle, and an elastic member. Annular groove plates are symmetrically arranged on the left and right at the top of the workbench. Limiting baffles are slidably arranged between the two annular groove plates. Elastic members are arranged on the left and right sides of the side walls of the limiting baffles close to each other. The other ends of the elastic members are connected to the square blocks in the middle of the annular groove plates.

[0009] In one embodiment, the cleaning assembly includes an annular groove frame, a gear ring, a mounting plate, a rotating motor, a rotating shaft, a gear, a square column, a swinging frame, and a scraping shovel. An annular groove frame is rotatably arranged on the laser nozzle. A gear ring is arranged on the annular groove frame. A square column is arranged on the annular groove frame. A swinging frame is rotatably arranged on the square column. A scraping shovel is rotatably arranged at the lower part of the swinging frame. A mounting plate is arranged on the left side of the bottom of the fixing plate. A rotating motor is arranged on the mounting plate. A rotating shaft is arranged on the output shaft of the rotating motor. A gear is arranged at the bottom of the rotating shaft. The gear meshes with the gear ring.

[0010] In one embodiment, a picking and placing assembly is arranged on the left side of the top of the workbench. The picking and placing assembly includes a picking and placing robotic arm, a fixing sleeve, and a double-shaft cylinder. A picking and placing robotic arm is arranged on the left side of the top of the workbench. A fixing sleeve is arranged at the bottom of the annular groove plate. A double-shaft cylinder is arranged on the fixing sleeve. The telescopic rod of the double-shaft cylinder is connected to the limiting baffle.

[0011] In one embodiment, an air injection assembly capable of cleaning the aluminum battery cover of the lithium battery pack is provided on the laser welding assembly. The air injection assembly includes an air injection pipe, a pipeline, an annular spray gun, and a charging pipe. The side wall of the laser nozzle is connected to the air injection pipe through a bracket. A pipeline is provided on the air injection pipe. An annular spray gun is provided on the laser nozzle, and a charging pipe is connected to the annular spray gun.

[0012] In one embodiment, a counterweight is provided inside the inclined shoveling surface of the scraping shovel.

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

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

[0015] 1. By designing to include a first electric slide rail and a second electric slide rail, precise welding of the edge of the aluminum battery shell can be achieved. The control of the servo motor enables the laser nozzle to move up and down as needed. At the same time, the scraping shovel driven by the swing frame can effectively remove the particulate matter generated during welding, ensuring the cleanliness of the welding area. In addition, the design of the baffle not only provides a stable welding track for the edge of the aluminum battery shell but also presses the shell and the cover plate to prevent the welding quality from being affected by misalignment. This design significantly improves the welding accuracy and efficiency and ensures the consistency of welding quality.

[0016] 2. During the welding process, the system provides a shielding gas through an external air pump and fully covers the welding area through the annular spray gun, effectively preventing the problem of internal voids in the weld seam 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 different edges of the aluminum battery shell along the track on the baffle. The contraction function of the double-axis cylinder further ensures the stability and position accuracy of the aluminum battery shell during the welding process. In addition, the design of the collection box also facilitates the collection of particulate matter generated during welding, keeping the working environment clean. Brief Description of the Drawings

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

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

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

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

[0021] Figure 5Schematic three-dimensional structure diagram of the shielding component of the present invention.

[0022] Figure 6 Schematic installation structure diagram of the cleaning component and the gas filling component of the present invention.

[0023] Figure 7 Schematic three-dimensional structure diagram of the cleaning component of the present invention.

[0024] Figure 8 Schematic installation structure diagram of the picking and placing component of the present invention.

[0025] Figure 9 Schematic three-dimensional structure diagram of the picking and placing component of the present invention.

[0026] Explanation of reference numerals: 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 component, 81 - straight slide rail, 82 - first sliding block, 83 - lead screw, 84 - servo motor, 85 - fixing plate, 86 - laser nozzle, 87 - connector, 9 - shielding component, 91 - guide rod, 92 - chute plate, 93 - second sliding block, 94 - shielding plate, 95 - electric push rod, 96 - U-shaped pull rod, 97 - track, 98 - connecting rod, 10 - fixing component, 101 - annular groove plate, 102 - limiting baffle, 103 - elastic member, 11 - cleaning component, 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 - scraping shovel, 12 - picking and placing component, 121 - picking and placing robotic arm, 122 - fixing sleeve, 123 - double-axis cylinder, 13 - gas filling component, 131 - air injection pipe, 132 - pipeline, 133 - annular spray gun, 134 - charging pipe, 14 - collection box. Detailed implementation manners

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

[0028] Embodiment: As Figures 1-9As shown in the figure, 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 picking and placing assembly 12, and a gas adding assembly 13. A placement plate 2 is arranged in the middle of the top of the workbench 1 by means of bolt connection. On the rear side of the top of the workbench 1, support frames 3 are symmetrically arranged on the left and right by means of bolt connection. A first electric slide rail 4 is arranged between the tops of the two support frames 3 by means of bolt connection. A first electric slider 5 is slidably arranged on the first electric slide rail 4. A second electric slide rail 6 is arranged on 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 assembly 8 capable of moving up and down is arranged on the second electric slider 7. The laser welding assembly 8 includes a straight slide rail 81, a first sliding block 82, a lead screw 83, a servo motor 84, a fixing plate 85, a laser nozzle 86, and a connector 87. A straight slide rail 81 is vertically arranged on the second electric slider 7. A first sliding block 82 is slidably arranged on the straight slide rail 81. A lead screw 83 is rotatably arranged on the straight slide rail 81. A servo motor 84 is arranged at the top of the straight slide rail 81. The output shaft of the servo motor 84 is connected to the lead screw 83. A fixing plate 85 is arranged on the first sliding block 82. A laser nozzle 86 is rotatably arranged on the fixing plate 85. A connector 87 is arranged at the top of the laser nozzle 86. The connector 87 is connected to the laser nozzle 86 through a wire. A shielding assembly 9 cooperating 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, a chute 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. Guide rods 91 are symmetrically arranged on the left and right on the rear side of the top of the workbench 1. A chute plate 92 is arranged between the two guide rods 91. A second sliding block 93 is slidably arranged on the chute plate 92. A slot is opened on the second sliding block 93. Shielding plates 94 are symmetrically arranged in the slot of the second sliding block 93. An electric push rod 95 is arranged at the center of the top of the second sliding block 93. A U-shaped pull rod 96 is arranged on the telescopic rod of the electric push rod 95. Both 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 rear side of the top of the workbench 1. A connecting rod 98 is slidably arranged on the track 97. The connecting rod 98 is connected to the bottom of the first electric slider 5. A fixing assembly 10 capable of limiting the lithium battery pack is arranged on the top of the workbench 1. The fixing assembly 10 includes an annular groove plate 101, a limiting baffle 102, and an elastic member 103. Annular groove plates 101 are symmetrically arranged on the left and right on the top of the workbench 1. Limiting baffles 102 are slidably arranged between the two annular groove plates 101. Elastic members 103 are arranged on the left and right sides of the side walls of the limiting baffles 102 close to each other. The elastic members 103 are compression springs. The other ends of the elastic members 103 are connected to the square blocks in the middle of the annular groove plates 101.A cleaning component 11 capable of processing metal particles on the aluminum battery cover of the lithium battery pack is provided on the laser welding component 8. The cleaning component 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 swinging frame 118 and a scraping shovel 119. An 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 swinging frame 118 is rotatably arranged on the square column 117. A scraping shovel 119 is rotatably arranged at the lower part of the swinging frame 118. A counterweight block is arranged on the inner side of the inclined shovel surface of the scraping shovel 119. A mounting plate 113 is arranged at the left bottom of the fixing 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. The gear 116 meshes with the gear ring 112. A picking and placing component 12 is arranged at the left top of the workbench 1. The picking and placing component 12 includes a picking and placing robotic arm 121, a fixed sleeve 122 and a double-shaft cylinder 123. A picking and placing robotic arm 121 is arranged at the left top of the workbench 1. A fixed sleeve 122 is arranged at the bottom of the annular groove plate 101. A double-shaft cylinder 123 is arranged on the fixed sleeve 122. The telescopic rod of the double-shaft cylinder 123 is connected to the limit baffle 102. The collection box 14 is placed at the bottom position of the placing plate 2. An air charging component 13 capable of cleaning the aluminum battery cover of the lithium battery pack is provided on the laser welding component 8. The air charging component 13 includes an air spraying 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 with an air spraying pipe 131 through a bracket. A pipeline 132 is arranged on the air spraying pipe 131. An annular spray gun 133 is arranged on the laser nozzle 86. An air charging pipe 134 is connected to the annular spray gun 133.,

[0029] When welding is required, the pick-and-place robotic arm 121 grips the aluminum battery housing to be welded, and then the pick-and-place robotic arm 121 rotates to drive the aluminum battery housing to be placed on the placement plate 2. 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 back and forth, so as to realize welding of the edge of the aluminum battery housing. By controlling the rotation of the servo motor 84, the servo motor 84 drives the lead screw 83 to rotate, and the first sliding block 82 drives the fixing plate 85 and the laser nozzle 86 to move downward. The swing frame 118 on the square column 117 rotates to drive the scraping shovel 119 to contact the aluminum battery housing. The scraping shovel 119 enters between the two shielding plates 94 to form a gap, flush with the aluminum battery housing. The laser nozzle 86 welds the side wall of the aluminum battery housing. Since the shielding plate 94 can form a welding track 97 against the edge of the aluminum battery housing, the shielding plate 94 presses the aluminum battery housing and the cover plate to prevent dislocation and large dislocation, which may affect the welding quality. The inclined shovel surface of the scraping shovel 119 can remove the granular substances generated during welding. The external air pump pumps gas into the pipeline 132 and the air spray pipe 131 to blow the dust on the aluminum battery housing. The external air pump pumps gas into the charging pipe 134 and sprays it through the annular spray gun 133 to increase the flow rate of the shielding gas, ensure full coverage of the welding area, and prevent the formation of cavities inside the weld due to insufficient shielding gas, high hydrogen content in the material, and too fast welding speed. When it is necessary to weld the aluminum battery housing forward along the edge of the aluminum battery housing, after one edge is welded, it moves to the right for welding. Then, the first electric slider 5 moves left and right on the first electric slide rail 4. The first electric slider 5 drives the second sliding block 93 to move through the connecting rod 98, and the second sliding block 93 drives the shielding plate 94 to move synchronously. The laser nozzle 86 welds the horizontal edge on the front side of the aluminum battery housing through the track 97 on the shielding plate 94. When welding the horizontal edge on the rear side of the aluminum battery housing, the cylinder drives the shielding plate 94 to move backward through the U-shaped pull rod 96, and the track 97 of the shielding plate 94 moves backward to the horizontal edge on the rear side of the aluminum battery housing, which is beneficial to the welding of the laser nozzle 86. The collection box 14 is used to collect the particulate matter under the placement plate 2. When the pick-and-place robotic arm 121 rotates and places the aluminum battery housing, the double-axial cylinder 123 contracts, and the double-axial cylinder 123 drives the limit baffle 102 to squeeze and limit the aluminum battery to ensure that the aluminum battery is placed correctly.

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

Claims

1. A laser welding device for lithium battery pack production, characterized in that, It includes a workbench (1). A placing plate (2) is arranged in the middle on the top of the workbench (1). On the rear side of the top of the workbench (1), support frames (3) are symmetrically arranged on the left and right. Between the tops of the two support frames (3), a first electric slide rail (4) is arranged. A first electric slider (5) is slidably arranged on the first electric slide rail (4). On the front side of the first electric slider (5), a second electric slide rail (6) is arranged. A second electric slider (7) is slidably arranged on the second electric slide rail (6). A laser welding assembly (8) capable of moving up and down is arranged on the second electric slider (7). A shielding assembly (9) cooperating with the laser welding assembly (8) is arranged on the rear side of the top of the workbench (1). A fixing assembly (10) capable of limiting the lithium battery pack is arranged on the top of the workbench (1). A cleaning assembly (11) capable of processing the metal particles on the aluminum battery cover of the lithium battery pack is arranged on the laser welding assembly (8). The laser welding assembly (8) includes a straight slide rail (81). The straight slide rail (81) is vertically arranged on the second electric slider (7). A first sliding block (82) is slidably arranged on the straight slide rail (81). A lead screw (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 lead screw (83). A fixing plate (85) is arranged on the first sliding block (82). A laser nozzle (86) is rotatably arranged on the fixing plate (85). A connecting head (87) is arranged on the top of the laser nozzle (86). The shielding assembly (9) includes guide rods (91). The guide rods (91) are symmetrically arranged on the left and right on the rear side of the top of the workbench (1). A chute plate (92) is arranged between the two guide rods (91). A second sliding block (93) is slidably arranged on the chute plate (92). A slot is formed on the second sliding block (93). Shielding plates (94) are symmetrically arranged in the slot of the second sliding block (93). An electric push rod (95) is arranged at the center of the top 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 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 rear side of the top of the workbench (1). A connecting rod (98) is slidably arranged on the track (97). The connecting rod (98) is connected to the bottom of the first electric slider (5).

2. The laser welding device for lithium battery pack production according to claim 1, characterized in that, The fixing assembly (10) includes annular groove plates (101). The annular groove plates (101) are symmetrically arranged on the left and right on the top of the workbench (1). Limiting baffles (102) are slidably arranged between the two annular groove plates (101). Elastic members (103) are arranged on the left and right sides of the side walls of the limiting baffles (102) close to each other. The other ends of the elastic members (103) are connected to the square blocks in the middle of the annular groove plates (101).

3. The laser welding device for lithium battery pack production according to claim 2, characterized in that, The cleaning component (11) includes 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 scraping shovel (119) is rotatably arranged at the lower part of the swing frame (118), an installation plate (113) is arranged at the left bottom of the fixed plate (85), a rotary motor (114) is arranged on the installation plate (113), a rotating shaft (115) is arranged on the output shaft of the rotary motor (114), a gear (116) is arranged at the bottom of the rotating shaft (115), and the gear (116) meshes with the gear ring (112).

4. The laser welding device for lithium battery pack production according to claim 3, characterized in that, A picking and placing component (12) is arranged at the left top of the workbench (1). The picking and placing component (12) includes a picking and placing robotic arm (121). The picking and placing robotic arm (121) is arranged at the left top of the workbench (1). A fixed sleeve (122) is arranged at the bottom of the annular groove plate (101), a double-shaft air cylinder (123) is arranged on the fixed sleeve (122), and the expansion link of the double-shaft air cylinder (123) is connected with the limit baffle (102).

5. A laser welding device for lithium battery pack production according to claim 4, characterized in that, An air adding component (13) capable of cleaning the aluminum battery cover of the lithium battery pack is arranged on the laser welding component (8). The air adding component (13) includes an air spraying pipe (131). The side wall of the laser nozzle (86) is connected with the air spraying pipe (131) through a bracket. A pipeline (132) is arranged on the air spraying pipe (131), an annular spray gun (133) is arranged on the laser nozzle (86), and an air charging pipe (134) is connected to the annular spray gun (133).

6. A laser welding device for lithium battery pack production according to claim 5, characterized in that, A counterweight block is arranged on the inner side of the inclined shovel surface of the scraping shovel (119).

7. A laser welding device for lithium battery pack production according to claim 6, characterized in that, A collection box (14) is further included, and the collection box (14) is placed at the bottom position of the placing plate (2).

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