A laser welding device for lithium iron phosphate lithium-ion battery components

Abstract

The present invention belongs to the field of lithium iron phosphate lithium-ion batteries, and in particular, relates to a laser welding device for lithium iron phosphate lithium-ion battery components, including a base, a placement plate for carrying a lithium iron phosphate lithium-ion battery pack is movably provided at the upper center position of the base, a first sliding unit is provided on both the front and rear sides of the placement plate at the upper part of the base, a second sliding unit is commonly connected between the two first sliding units, a laser welding gun is provided on the second sliding unit, a third sliding mechanism is provided on both the left and right sides of the placement plate at the upper part of the base, and a first bracket and a second bracket are provided on the third sliding mechanism. The present invention can automatically place multiple connecting plates on the lithium iron phosphate lithium-ion battery pack, and can automatically press the connecting plates on the upper surface of the lithium iron phosphate lithium-ion through a positioning mechanism for welding, which reduces the difficulty of operation while ensuring the accuracy of subsequent connecting plate welding, and improves the overall efficiency.

Description

Technical Field

[0001] The present invention belongs to the field of lithium iron phosphate lithium ion battery processing, and in particular relates to a laser welding device for lithium iron phosphate lithium ion battery components. Background Art

[0002] Lithium iron phosphate batteries are a type of lithium-ion battery whose primary cathode material is lithium iron phosphate. Due to their high safety, long cycle life, and relatively low cost, these batteries are widely used in electric vehicles, energy storage systems, portable power supplies, and backup power systems.

[0003] Laser welding provides high-precision, high-energy-density, and non-contact welding, which is particularly important for welding battery components because it can reduce the heat-affected zone and avoid damage to sensitive battery materials. When assembling lithium iron phosphate (LiFePO4) battery components, the processing personnel place the LiFePO4 battery cells on the welding platform after binding them together. Then, a connecting piece is placed between each group of two adjacent LiFePO4 battery cells. Laser welding is then performed using a laser welding gun. A positioning frame is installed directly below the muzzle of the laser welding gun. During welding, the positioning frame presses down on the surface of the connecting piece to fix the connecting piece. After the connecting piece is fixed, the welding gun uses laser welding to weld the connecting piece to the battery cell.

[0004] Currently, to ensure the quality and aesthetics of the welding between the connector and the battery cell, workers must carefully position each connector on the two battery cells to prevent it from tilting and affecting subsequent welding. This placement process takes a considerable amount of time, and the constant, focused work overtime drains the worker's energy and physical strength, making it impossible to fully guarantee the precise placement of the connector. Furthermore, when positioning the connector using the pressure plate, the downward movement of the pressure plate is relatively slow to prevent overpressure on the connector. Due to the numerous weld points on a set of lithium iron phosphate (LiFePO4) batteries, the pressure plate must be moved up and down frequently to secure the connector. This method of securing the connector increases welding time and cannot meet the processing efficiency requirements for mass production of LiFePO4 batteries. Summary of the Invention

[0005] In view of the above problems, the embodiment of the present application provides a laser welding device for lithium iron phosphate lithium-ion battery assemblies, which can automatically place multiple connecting plates on the lithium iron phosphate lithium-ion battery pack, and can automatically press the connecting plates on the upper surface of the lithium iron phosphate lithium-ion through a positioning mechanism for welding, thereby reducing the difficulty of operation while ensuring the accuracy of subsequent connecting plate welding and improving overall efficiency.

[0006] In order to achieve the above-mentioned purpose, the embodiment of the present application provides the following technical solution: The present invention provides a laser welding device for a lithium iron phosphate lithium-ion battery assembly, comprising a base, a placement plate for supporting the lithium iron phosphate lithium-ion battery pack being movably provided at the upper center position of the base, the upper part of the base is located at the front and rear sides of the placement plate and is provided with a first sliding unit, a second sliding unit is commonly connected between the two first sliding units, a laser welding gun is provided on the second sliding unit, the upper part of the base is located at the left and right sides of the placement plate and is provided with a third sliding mechanism, a first bracket and a second bracket are provided on the third sliding mechanism, a positioning mechanism that can press the connecting piece during welding is commonly connected between the two first brackets, and a loading mechanism that can automatically discharge the connecting piece is commonly connected between the two second brackets. The positioning mechanism includes a positioning frame, the left and right side walls of which are respectively fixed to one end of the two first brackets. A slide groove is provided on the upper surfaces of the left and right ends of the positioning frame, and two guide posts are symmetrically arranged in the slide groove. The surfaces of the guide posts are provided with springs. A guide seat is slidably provided between the front and rear slide grooves. The upper end surface of the guide seat is configured as an arc. Both ends of the guide seat are movably connected to the two guide posts in the corresponding slide grooves. A pressure plate is fixed to the bottom of the guide seat, and a rectangular through hole is provided between the guide seat and the pressure plate for the laser to pass through. Both first sliding units are provided with an L-shaped connecting rod, and the bottom ends of the two connecting rods are connected to a U-shaped plate that can drive the guide seat to move downward during movement.

[0007] According to a favorable embodiment, a pull-out groove is provided on the upper portion of the base, the placement plate is slidably arranged in the pull-out groove, and a positioning plate is fixedly provided on the upper portion of the placement plate, a positioning groove for limiting the lithium iron phosphate lithium-ion battery pack is provided on the upper portion of the positioning plate, and two filling columns are provided on the upper portion of the positioning plate, and the two filling columns are diagonally distributed on the positioning plate.

[0008] According to a preferred embodiment, the first sliding unit includes a first slide rail fixed on the base by four support columns, a first screw is rotatably provided on the first slide rail, a first slider is threadedly provided on the first screw, the bottom of the first slider is connected to the top of the connecting rod, a first motor is provided at either end of the first slide rail, and the output shaft of the first motor is connected to one end of the first screw.

[0009] According to a preferred embodiment, the second sliding unit includes a second slide rail, the front and rear ends of the second slide rail are respectively fixed to the side of the two first sliders close to each other, a second screw is rotatably provided on the second slide rail, a second slider is threadedly provided on the second screw, the second slider is slidably provided on the second slide rail, the laser welding gun is fixed on the second slider, a second motor is provided at either end of the second slide rail, and the output shaft of the second motor is connected to one end of the second screw.

[0010] According to a favorable embodiment, the third sliding unit includes a third slide rail fixed on the base, a long slide seat is movably provided in the third slide rail, a rack composed of a plurality of tooth blocks is provided at the bottom of the slide seat, and a rotating shaft is rotatably provided on one side of the base, two gears are symmetrically provided on the rotating shaft, the gears are meshed and connected with the corresponding racks at the bottom of the slide seat, and either end of the rotating shaft is connected to a third motor fixed on the base.

[0011] According to a preferred embodiment, the third slide rail comprises an elongated mounting base, the upper portion of which defines a sliding channel, the slide being slidably disposed within the channel, and a plurality of guide rollers being rotatably disposed on the left and right inner walls and the bottom inner wall of the channel, the guide rollers being in active contact with the outer wall of the slide rail. A cover plate is disposed above the channel, the upper portion of which defines a sliding hole, the bottom ends of the first and second brackets passing through the sliding hole and being fixedly coupled to the third slide rail within the channel, the upper portion of the slide rail also being provided with a plurality of guide rollers, the guide rollers being in active contact with the bottom inner wall of the cover plate.

[0012] According to a favorable embodiment, the loading mechanism includes a storage dish, a single-axis cylinder is provided on the second bracket, the telescopic ends of the two single-axis cylinders are respectively fixed to the left and right side walls of the storage dish, a storage bin for storing connecting pieces is provided in the upper middle position of the storage dish, and a plurality of material guide channels matching the connecting pieces are provided at the upper left and right ends of the storage dish, a double-axis cylinder is provided at the bottom of the storage dish, and the two output shafts of the double-axis cylinder are respectively connected to a clamping frame.

[0013] According to a favorable embodiment, a guide groove is provided on the side wall of the bottom port of the material guide channel, and the clamping frame includes a plurality of clamping blocks for fixing the lowest connecting plate of the material guide channel, and the clamping blocks are slidably arranged in the guide groove. A connecting plate is commonly connected between the plurality of clamping blocks, and the output shaft of the dual-axis cylinder is connected to the connecting plate.

[0014] Compared with the prior art, the laser welding device for lithium iron phosphate lithium-ion battery components provided by the embodiment of the present invention has the following beneficial effects:

[0015] 1. In the present invention, a feeding mechanism is provided on the third sliding unit, and a material guide channel is opened on the surface of the storage dish in the feeding mechanism. The connecting piece can be loaded into the material guide channel. After being moved to the top of the placed lithium iron phosphate lithium-ion battery pack, multiple connecting pieces can be placed simultaneously and accurately on each battery cell on the upper surface of the lithium iron phosphate lithium-ion battery pack. Compared with the method of manually positioning the connecting piece during feeding, this solution can ensure feeding efficiency while having higher feeding accuracy.

[0016] 2. In the present invention, a positioning mechanism is also provided on the third sliding unit. When the feeding mechanism places the various connecting plates on the lithium iron phosphate lithium-ion battery pack, the feeding mechanism moves away from the third sliding unit while the positioning mechanism moves synchronously to the top of the lithium iron phosphate lithium-ion battery pack. When the laser welding gun moves toward the lithium iron phosphate lithium-ion battery pack with the help of the first sliding unit, the U-shaped plate connected to the first sliding unit can cooperate with the guide seat on the positioning mechanism to drive the guide seat to move downward, thereby driving the pressure plate at the bottom of the guide seat to be pressed against the surface of the connecting plate below. Compared with the prior art in which the laser welding gun needs to move downward frequently to press the connecting plate during welding, this solution can ensure that the laser welding gun does not need to perform a downward pressing action during the entire welding process, greatly shortening the positioning time of the welding gun and further improving the welding efficiency.

[0017] 3. In the present invention, the placement plate is slidably arranged on the base, and the positioning plate above the placement plate positions the lithium iron phosphate lithium-ion battery pack through the positioning groove, and the two filling columns can support the connecting pieces at the edge of both ends of the lithium iron phosphate lithium-ion battery, eliminating the need for manual support during welding, and the welding operation is more convenient and labor-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the external overall three-dimensional structure diagram of the present invention.

[0019] Figure 2 It is a main cross-sectional three-dimensional structural diagram of the present invention.

[0020] Figure 3 This is a schematic diagram of the relative position structure of the positioning mechanism, feeding mechanism and laser welding gun in the present invention.

[0021] Figure 4 It is the external three-dimensional structural diagram of the placement plate in the present invention.

[0022] Figure 5 This is an external structural diagram of the third sliding unit in the present invention.

[0023] Figure 6 It is a schematic diagram of the bottom plane structure of the storage dish in the present invention.

[0024] Figure 7It is a schematic diagram of the external structure of the positioning mechanism in the present invention.

[0025] Figure 8 for Figure 7 The external structure diagram of part A.

[0026] Reference numerals in the figure: 1, base; 2, placement plate; 201, positioning plate; 202, filling column; 3, first sliding unit; 301, first slide rail; 302, first screw; 303, first slider; 4, second sliding unit; 401, second slide rail; 402, second screw; 403, second slider; 5, laser welding gun; 6, third sliding mechanism; 601, third slide rail; 6011, mounting seat; 6012, cover plate; 602, slide seat; 603, rack; 604, rotating shaft; 6 05. Gear; 7. First bracket; 8. Second bracket; 9. Positioning mechanism; 901. Positioning frame; 902. Guide column; 903. Spring; 904. Guide seat; 905. Pressing plate; 906. Through hole; 10. Loading mechanism; 1001. Storage dish; 1002. Single-axis cylinder; 1003. Storage bin; 1004. Material guide channel; 1005. Double-axis cylinder; 1006. Pressing frame; 10061. Pressing block; 10062. Connecting plate; 11. U-shaped plate; 12. Connecting piece. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-8 This application is described in further detail.

[0028] Please refer to Figure 1-4 , a laser welding device for a lithium iron phosphate lithium-ion battery assembly comprises a base 1, a placement plate 2 for carrying a lithium iron phosphate lithium-ion battery pack is movably provided at the upper center position of the base 1, the upper part of the base 1 is provided with a first sliding unit 3 on both the front and rear sides of the placement plate 2, a second sliding unit 4 is commonly connected between the two first sliding units 3, and a laser welding gun 5 is provided on the second sliding unit 4, the upper part of the base 1 is provided with a third sliding mechanism 6 on both the left and right sides of the placement plate 2, a first bracket 7 and a second bracket 8 are provided on the third sliding mechanism 6, a positioning mechanism 9 for fixing the connecting piece 12 during welding is commonly connected between the left and right first brackets 7, and a loading mechanism 10 that can automatically discharge the connecting piece 12 is commonly connected between the second brackets 8. The loading mechanism 10 places multiple connecting plates 12 on the battery cells on the upper surface of the lithium iron phosphate lithium-ion battery pack at the same time, and then moves the loading mechanism 10 away and moves the positioning mechanism 9 to the top of the lithium iron phosphate lithium-ion battery pack where the connecting plates 12 have been placed. Then, the laser welding gun 5 will move toward the welding position under the drive of the first sliding unit 3 to perform the welding operation.

[0029] See Figure 3 、 Figure 7 and Figure 8 The positioning mechanism 9 comprises a positioning frame 901, the left and right sidewalls of which are respectively fixed to one end of the two first brackets 7. Slide slots are defined on the upper surfaces of both ends of the positioning frame 901, with two guide posts 902 symmetrically positioned within the slots. Springs 903 are sleeved on the surfaces of the guide posts 902. A guide seat 904 is slidably positioned between the front and rear slots, with the upper end surface of the guide seat 904 being arc-shaped. Both ends of the guide seat 904 are movably engaged with the two guide posts 902 within the corresponding slots. A pressure plate 905 is fixed to the bottom of the guide seat 904, and a rectangular through-hole 906 is defined between the guide seat 904 and the pressure plate 905, allowing the laser to pass through. Both first sliding units 3 are provided with an L-shaped connecting rod. A U-shaped plate 11 is connected to the bottom ends of the two connecting rods, which is capable of driving the guide seat 904 downward when the laser welding gun 5 moves.

[0030] In order to shorten the time for the connecting piece 12 to be fixed on the surface of the lithium iron phosphate lithium-ion battery pack for welding, when the laser welding gun 5 moves toward the lithium iron phosphate lithium-ion battery pack through the first sliding unit 3, the U-shaped plate 11 fixed to the first sliding unit 3 below can abut against the guide seat 904 on the positioning frame 901 in advance. Since the upper end surface of the guide seat 904 is arc-shaped, when it abuts against the U-shaped plate 11, the guide seat 904 will be pressed and move downward along the slide groove, so that the pressure plate 905 below the guide seat 904 can gradually approach the connecting piece 12 and finally press the connecting piece 12 on the upper part of the lithium iron phosphate lithium-ion battery pack. Compared with the method in the prior art where the laser welding gun 5 needs to control the pressure plate 905 to move down a certain distance to fix the connecting piece 12 when welding each welding point on the connecting piece 12, the operation steps when pressing the connecting piece 12 are reduced, thereby shortening the fixing time of the connecting piece 12 during welding and improving welding efficiency.

[0031] See Figure 1 and Figure 4, a pull-out groove is provided on the upper part of the base 1, the placement plate 2 is slidably set in the pull-out groove, and a positioning plate 201 is fixed on the upper part of the placement plate 2, and a positioning groove for limiting the lithium iron phosphate lithium-ion battery pack is provided on the upper part of the positioning plate 201, and two filling columns 202 are provided on the upper part of the positioning plate 201, and the two filling columns 202 are diagonally distributed on the positioning plate 201. The lithium iron phosphate lithium-ion battery pack is placed in the positioning groove on the positioning plate 201 for limiting, and then the placement plate 2 is pushed to move the entire body to the center position of the substrate for welding. Since an additional connecting piece 12 needs to be welded to both the positive and negative ends of the lithium iron phosphate lithium-ion battery pack during welding, the two filling columns 202 can support the connecting piece 12, so that all the connecting pieces 12 that need to be welded on the lithium iron phosphate lithium-ion battery pack can be welded at one time.

[0032] See Figure 1 and Figure 2 The first sliding unit 3 includes a first slide rail 301 fixed to the base 1 via four support columns. A first screw 302 is rotatably provided on the first slide rail 301. A first slider 303 is threadedly provided on the first screw 302. The bottom of the first slider 303 is connected to the top of the connecting rod. A first motor is provided at either end of the first slide rail 301. The output shaft of the first motor is connected to one end of the first screw 302. The second sliding unit 4 includes a second slide rail 401. The front and rear ends of the second slide rail 401 are respectively fixed to the sides of the two first sliders 303 that are close to each other. A second screw 402 is rotatably provided on the second slide rail 401. A second slider 403 is threadedly provided on the second screw 402. The second slider 403 is slidably provided on the second slide rail 401. The laser welding gun 5 is fixed to the second slider 403. A second motor is provided at either end of the second slide rail 401. The output shaft of the second motor is connected to one end of the second screw 402. The first motor drives the first screw 302 to rotate, so that the first slider 303 moves. The movement of the two first sliders 303 jointly drives the second slide rail 401 to move. The second screw 402 is driven by the second motor to move the second slider 403 on the second screw 402, thereby controlling the horizontal movement of the laser welding gun 5. At the same time, when the first slider 303 moves, it can also drive the U-shaped plate 11 to move synchronously through the connecting rod.

[0033] See Figure 5The third sliding unit includes a third slide rail 601 fixed to the base 1. An elongated slide 602 is movably mounted within the third slide rail 601. A rack 603 composed of several toothed blocks is disposed at the bottom of the slide 602. A rotating shaft 604 is rotatably mounted on one side of the base 1. Two gears 605 are symmetrically mounted on the rotating shaft 604. These gears 605 mesh with the corresponding racks 603 at the bottom of the slide 602. Either end of the rotating shaft 604 is connected to a third motor fixed to the base 1. The third motor drives the rotating shaft 604 to rotate, driving the two gears 605 to rotate. The rotation of the gears 605, in conjunction with the rack 603, enables the slide 602 to move, thereby controlling the movement of the positioning mechanism 9 and the feeding mechanism 10.

[0034] See Figure 5 The third slide rail 601 includes an elongated mounting seat 6011. A sliding channel is defined at the top of the mounting seat 6011, within which the slide 602 slides. Several guide rollers are rotatably mounted on the left and right inner walls and the bottom inner wall of the sliding channel. These guide rollers flexibly abut against the outer wall of the slide 602. A cover plate 6012 is positioned above the sliding channel. A sliding hole is defined at the top of the cover plate 6012. The bottom ends of the first and second brackets 7 and 8 pass through the sliding hole and are fixedly connected to the third slide rail 601 within the sliding channel. Several guide rollers are also positioned at the top of the slide 602, which flexibly abut against the bottom inner wall of the cover plate 6012. The guide rollers reduce friction between the slide 602 and the mounting seat 6011 during frequent back-and-forth movement, thereby reducing wear.

[0035] See Figure 3 and Figure 6 The loading mechanism 10 includes a storage dish 1001, a single-axis cylinder 1002 is provided on the second bracket 8, and the telescopic ends of the two single-axis cylinders 1002 are respectively fixed to the left and right side walls of the storage dish 1001, and a storage bin 1003 for storing the connecting piece 12 is provided in the upper middle position of the storage dish 1001, and a plurality of material guide channels 1004 matching the connecting piece 12 are provided at the left and right ends of the upper part of the storage dish 1001, and a double-axis cylinder 1005 is provided at the bottom of the storage dish 1001, and the two output shafts of the double-axis cylinder 1005 are respectively connected to a pressing frame 1006. A guide groove is provided on the side wall of the bottom port of the material guide channel 1004, and the clamping frame 1006 includes a plurality of clamping blocks 10061 for fixing the lowest connecting plate 12 of the material guide channel 1004. The clamping blocks 10061 are slidably arranged in the guide groove, and a connecting plate 10062 is commonly connected between the plurality of clamping blocks 10061, and the output shaft of the dual-axis cylinder 1005 is connected to the connecting plate 10062.

[0036] In order to be able to quickly and accurately place multiple connecting pieces 12 on the battery cells above the lithium iron phosphate lithium-ion battery pack, this solution sets up a storage dish 1001, and the storage bin 1003 at the center can store the connecting pieces 12. At the same time, there are multiple material guide channels 1004 on the left and right ends. The staff can put the connecting pieces 12 neatly in the material guide channels 1004. Multiple connecting pieces 12 can be loaded into the same material guide channel 1004 at one time. The bottom connecting piece 12 is fixed by the pressing block 10061 on the pressing frame 1006. When the storage dish 1001 moves to the iron phosphate When it is directly above the lithium-ion battery pack, the single-axis cylinder 1002 contracts to control the storage dish 1001 to move down a certain distance, so that the lower end of the material guide channel 1004 is as close as possible to the upper surface of the lithium iron phosphate lithium-ion battery pack, and then the double-axis cylinder 1005 contracts, so that the connecting piece 12 loses pressure and falls on the two adjacent battery cells on the upper surface of the lithium iron phosphate lithium-ion battery pack. After that, the double-axis cylinder 1005 extends and presses the other redundant connecting pieces 12. The single-axis cylinder 1002 rises and moves away from the lithium iron phosphate lithium-ion battery pack, and then moves out of position through the third sliding unit to proceed to the next process.

[0037] During specific work, the staff can arrange the connecting piece 12 neatly in advance and place it in the material guide channel 1004. Multiple connecting pieces 12 can be loaded in the same material guide channel 1004 at a time. The bottom connecting piece 12 is fixed by the clamping block 10061 on the clamping frame 1006, and the tied lithium iron phosphate lithium-ion battery pack is placed in the positioning groove on the positioning plate 201, and then pushed into the center position of the base 1. When the storage dish 1001 moves to the top of the lithium iron phosphate lithium-ion battery pack through the third sliding unit, the single-axis cylinder 1002 is contracted to make the storage dish 1001 move down a certain distance to ensure that the lower port of the material guide channel 1004 is as close as possible to the upper surface of the lithium iron phosphate lithium-ion battery pack. Then the double-axis cylinder 1005 is contracted, and the clamping block 10061 is separated from the bottom connecting piece 12, so that the connecting piece 12 loses the side pressure and falls on the iron phosphate lithium-ion battery pack. On the two adjacent battery cells on the upper surface of the lithium-ion battery pack, the dual-axis cylinder 1005 then extends out, pressing the other redundant connecting pieces 12, and the single-axis cylinder 1002 rises and moves away from the lithium iron phosphate lithium-ion battery pack. Then, the positioning frame 901 moves to the top of the lithium iron phosphate lithium-ion battery pack where the connecting piece 12 has been placed after the third sliding unit moves out of position. Then, the first sliding unit 3 drives the laser welding gun 5 to move toward the welding position, and at the same time, the U-shaped plate 11 below follows the movement. When the laser welding gun 5 is about to move to the predetermined welding position, the U-shaped plate 11 abuts against the guide seat 904 on the positioning frame 901, pushing the guide seat 904 to move downward, so that the pressure plate 905 at the bottom of the guide seat 904 can be pressed on the surfaces of multiple connecting pieces 12 on the same side, and then the welding gun can continue to move a short distance to reach the designated position to weld the welding points on each connecting piece 12.

[0038] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention's description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A laser welding device for lithium iron phosphate lithium-ion battery assembly, comprising a base (1), characterized in that: A placement plate (2) for carrying a lithium iron phosphate lithium-ion battery pack is movably provided at the center of the upper part of the base (1); first sliding units (3) are provided on both the front and rear sides of the placement plate (2) at the upper part of the base (1); a second sliding unit (4) is commonly connected between the two first sliding units (3); a laser welding gun (5) is provided on the second sliding unit (4); a third sliding unit (6) is provided on both the left and right sides of the placement plate (2) at the upper part of the base (1); a first bracket (7) and a second bracket (8) are provided on the third sliding unit (6); a positioning mechanism (9) capable of pressing the connecting piece (12) during welding is commonly connected between the left and right first brackets (7); a loading mechanism (10) capable of automatically discharging the connecting piece (12) is commonly connected between the two second brackets (8); The positioning mechanism (9) comprises a positioning frame (901), the left and right side walls of the positioning frame (901) are respectively fixedly connected to one end of the two first brackets (7), the upper surfaces of the left and right ends of the positioning frame (901) are provided with sliding grooves, two guide posts (902) are symmetrically arranged in the sliding grooves, the surfaces of the guide posts (902) are sleeved with springs (903), the same guide seat (904) is slidably arranged between the front and rear sliding grooves, the upper end surface of the guide seat (904) is arranged in an arc shape, the two ends of the guide seat (904) are movably plugged with the two guide posts (902) in the corresponding sliding grooves, a pressing plate (905) is fixedly provided at the bottom of the guide seat (904), and a rectangular through hole (906) for laser passing is provided between the guide seat (904) and the pressing plate (905); An L-shaped connecting rod is provided on each of the two first sliding units (3), and a U-shaped plate (11) capable of driving the guide seat (904) to move downward is commonly connected between the bottom ends of the two connecting rods.

2. A laser welding device for lithium iron phosphate lithium-ion battery components according to claim 1, characterized in that: The upper portion of the base (1) is provided with a pull-out groove, the placement plate (2) is slidably arranged in the pull-out groove, and a positioning plate (201) is fixedly arranged on the upper portion of the placement plate (2), a positioning groove for limiting the position of the lithium iron phosphate lithium-ion battery pack is provided on the upper portion of the positioning plate (201), and two filling columns (202) are arranged on the upper portion of the positioning plate (201), and the two filling columns (202) are diagonally distributed on the positioning plate (201).

3. A laser welding device for lithium iron phosphate lithium-ion battery assembly according to claim 1, characterized in that: The first sliding unit (3) comprises a first slide rail (301) fixed on the base (1) via four support columns, a first screw rod (302) being rotatably arranged on the first slide rail (301), a first slider (303) being threadedly arranged on the first screw rod (302), the bottom of the first slider (303) being connected to the top of a connecting rod, a first motor being arranged at either end of the first slide rail (301), and an output shaft of the first motor being connected to one end of the first screw rod (302).

4. A laser welding device for lithium iron phosphate lithium-ion battery assembly according to claim 3, characterized in that: The second sliding unit (4) comprises a second slide rail (401), the front and rear ends of the second slide rail (401) are respectively fixedly connected to the sides of the two first sliders (303) close to each other, a second screw rod (402) is rotatably arranged on the second slide rail (401), a second slider (403) is threadedly arranged on the second screw rod (402), the second slider (403) is slidably arranged on the second slide rail (401), the laser welding gun (5) is fixedly arranged on the second slider (403), a second motor is arranged at either end of the second slide rail (401), and an output shaft of the second motor is connected to one end of the second screw rod (402).

5. A laser welding device for lithium iron phosphate lithium-ion battery assembly according to claim 1, characterized in that: The third sliding unit comprises a third slide rail (601) fixed on the base (1), a long strip slide seat (602) is movably arranged in the third slide rail (601), a rack (603) composed of a plurality of tooth blocks is arranged at the bottom of the slide seat (602), and a rotating shaft (604) is rotatably arranged on one side of the base (1), two gears (605) are symmetrically arranged on the rotating shaft (604), and the gears (605) are meshed and connected with the corresponding racks (603) at the bottom of the slide seat (602), and any end of the rotating shaft (604) is connected to a third motor fixed on the base (1).

6. A laser welding device for lithium iron phosphate lithium-ion battery assembly according to claim 5, characterized in that: The third slide rail (601) comprises a long strip-shaped mounting seat (6011), the upper part of which is provided with a sliding channel, the slide seat (602) being slidably arranged in the sliding channel, and a plurality of guide rollers being rotatably arranged on the left and right inner walls and the bottom inner wall of the sliding channel, the guide rollers being movably abutted against the outer wall of the slide seat (602); A cover plate (6012) is arranged on the upper part of the sliding channel, and a sliding hole is opened on the upper part of the cover plate (6012). The bottom ends of the first bracket (7) and the second bracket (8) pass through the sliding hole and are fixedly connected to the third sliding rail (601) inside the sliding channel. A plurality of guide rollers are also arranged on the upper part of the sliding seat (602), and the guide rollers are movably abutted against the bottom inner wall of the cover plate (6012).

7. A laser welding device for lithium iron phosphate lithium-ion battery assembly according to claim 1, characterized in that: The feeding mechanism (10) comprises a material storage dish (1001), a single-axis cylinder (1002) is arranged on the second bracket (8), the telescopic ends of the two single-axis cylinders (1002) are respectively fixedly connected to the left and right side walls of the material storage dish (1001), a material storage bin (1003) for storing the connecting piece (12) is provided in the middle position of the upper part of the material storage dish (1001), and a plurality of material guide channels (1004) matching the connecting piece (12) are provided at the left and right ends of the upper part of the material storage dish (1001), a double-axis cylinder (1005) is arranged at the bottom of the material storage dish (1001), and the two output shafts of the double-axis cylinder (1005) are respectively connected to a clamping frame (1006).

8. A laser welding device for lithium iron phosphate lithium-ion battery assembly according to claim 7, characterized in that: A guide groove is provided on the side wall of the bottom port of the material guide channel (1004); the clamping frame (1006) includes a plurality of clamping blocks (10061) for fixing the lowest connecting plate (12) of the material guide channel (1004); the clamping blocks (10061) are slidably arranged in the guide groove; a connecting plate (10062) is commonly connected between the plurality of clamping blocks (10061); and the output shaft of the dual-axis cylinder (1005) is connected to the connecting plate (10062).

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