Laser flying welding device for lithium battery connecting piece and using method

Abstract

The invention discloses a laser flying welding device for a lithium battery connecting piece and a using method, and particularly relates to the technical field of lithium battery preparation.The laser flying welding device is characterized in that an ejection unit, a forming groove and a rotating supporting piece are arranged in an alignment bin, and the entering direction and posture of the connecting piece are preliminarily restrained through a limiting channel; the lowermost connecting piece is pushed to the upper surface of the rotating supporting piece through the positioning pushing block, the rotating supporting piece supports the connecting piece, the connecting piece is evenly stressed in the subsequent forming and moving process, the jacking air cylinder drives the jacking table to move upwards, and the connecting piece is jacked and pressed into a forming groove in the middle of the lower surface of the second adsorption plate. Therefore, the shape correction of the connecting piece is completed in the alignment bin, the connecting piece is accurately attached to the positions of tabs with the same polarity on a plurality of battery cells, the problem of uneven welding quality caused by the height tolerance of the tabs or the deformation of the connecting piece is reduced, the welding focus offset caused by the warping or the size deviation of the connecting piece is avoided, and the welding stability is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of lithium battery preparation, in particular to a laser flying welding device for a lithium battery connecting sheet and a use method. BACKGROUND

[0002] Lithium ion batteries are widely used in power batteries, energy storage batteries and consumer electronics. In the process of assembling cells, modules or battery packs, it is usually necessary to reliably electrically connect conductive components such as tabs, busbars (busbars) and connecting sheets to form an electrical connection loop that meets the requirements of large current transmission. The welding quality of the connecting sheet will directly affect the internal resistance consistency, temperature rise level and cycle life of the battery module, and therefore high requirements are put forward for the stability of the welding process, the consistency of the welding spots and the production rhythm.

[0003] The existing connecting sheet welding methods include resistance welding, ultrasonic welding and laser welding. Among them, laser welding has the characteristics of high energy density, relatively controllable heat-affected zone and easy automation, and gradually becomes a common process for connecting the connecting sheet with the tab or busbar. In the automatic production line, in order to improve the rhythm and reduce the handling and start-stop time between stations, the laser "flying welding" method is often used, that is, the welding spot is processed under the condition of continuous movement of the workpiece or high-speed scanning of the galvanometer, so as to realize continuous processing of multiple welding spots and high-efficiency production.

[0004] However, the connecting sheet is not effectively shape-corrected before being attached to multiple cell tabs, and is easily warped and bent due to the influence of material elasticity, transportation or stacking, resulting in a difference in the actual welding interface between the connecting sheet and the tab, so that the laser welding focal point deviates from the actual welding interface, and local virtual welding, overwelding or tab burning may occur during welding. SUMMARY

[0005] The application aims to provide a laser flying welding device for a lithium battery connecting sheet and a use method to solve the problems mentioned in the background.

[0006] The technical problem solved by the application is: The connecting sheet is not effectively shape-corrected before being attached to multiple cell tabs, resulting in a difference in the actual welding interface between the connecting sheet and the tab, so that the laser welding focal point deviates from the actual welding interface.

[0007] The application can be implemented by the following technical solutions: A laser flying welding device for lithium battery connectors includes a welding chamber mounted on a base and a conveying unit that sequentially conveys several lithium battery modules into the welding chamber. The welding chamber has an alignment chamber for aligning the connectors with the lithium battery units on the side facing the conveying direction, and a docking and feeding unit is slidably provided on the side of the conveying unit away from the welding chamber. The docking and feeding unit includes a sliding plate that slides along the base. The width of the sliding plate is smaller than the width of the conveying unit. Above the sliding plate, there is a lifting plate that moves in stages and fixes the battery casing. On one side of the lifting plate, there is a pushing unit for pushing several battery cells into the battery casing. The battery casing has an opening on the side facing the feeding unit; A mounting bracket is provided on one side above the feeding unit, and an alignment mounting unit for fixing the cover plate to the battery casing is installed on the lower surface of the mounting bracket. The alignment chamber is provided with a limiting channel for the entry of the connecting piece, and the alignment chamber is also provided with an ejection unit for stamping the connecting piece. The ejection unit includes a sliding seat that slides along a guide rail on the inner wall of the alignment chamber. A base support is mounted on the bottom surface of the sliding seat, and a lifting top platform is embedded in the upper surface of the sliding seat. A lifting cylinder that pushes the top platform is mounted on the base support. The alignment chamber is equipped with a rotating support for supporting the connecting piece. Above the rotating support is an adsorption plate two that moves vertically to adsorb and fix the connecting piece. The lower surface of the adsorption plate two is provided with a forming groove in the middle for use with the ejection unit.

[0008] A further technical improvement of the present invention is that: the limiting channel includes a placement port, a guide side plate is provided on one side of the placement port, a material conveying channel is provided between the guide side plate and the rotating support member, and a bearing plate flush with the rotating support member is provided below the placement port; The inner wall of the alignment chamber is embedded with a positioning pusher block that is driven by a pusher cylinder.

[0009] A further technical improvement of the present invention is that: the rotating support includes a side groove provided on the inner wall of the alignment chamber, and two flip plates are installed inside the side groove by a rotating cylinder. The two flip plates are fixed by a connecting rod, and the distance between the two flip plates is less than the length of the connecting piece.

[0010] A further technical improvement of the present invention is that: the mounting unit includes a support seat installed at the lower end of the mounting frame plate, the surface of the mounting frame plate is provided with a limiting slot for limiting the entry of the cover plate, the inner wall of the support seat is provided with a vertical guide rail, a slide block is slidably provided on the vertical guide rail, and an electric gripper for clamping the bottom surface of the cover plate is installed on the upper surface of the slide block.

[0011] A further technical improvement of the present invention is that: a push plate driven by a correction cylinder is provided on the inner side of the support base near the rear side of the vertical guide rail, and an adsorption plate for adsorbing and fixing the side of the cover plate is installed on the inner side of the push plate. The surface of the support base is provided with a wire feed tube for screw insertion. The wire feed tube is aligned with the screw holes on the cover plate and the battery housing. A feed cylinder is installed on the outer end face of the correction cylinder. The pushing end of the feed cylinder is connected to an electric screwdriver for tightening the screw.

[0012] A further technical improvement of the present invention is that the conveying unit includes two conveying frames, each of which has a conveyor belt installed on its inner wall surface. Several positioning blocks for limiting the battery casing are installed on the conveyor belts, and the gap length between the two conveyor belts is greater than the width of the sliding plate.

[0013] A further technical improvement of the present invention is that: a stroke cylinder for pushing the lifting plate is installed in the middle of the upper surface of the sliding plate; an adjusting block that is threadedly connected to a bidirectional screw is embedded in the upper surface of the lifting plate; a positioning plate is fixed at the upper end of the adjusting block; and a locking block is installed on the inner wall of the positioning plate. Both sides of the lower surface of the card block are inclined outward and adapted to fit the groove of the battery casing.

[0014] A further technical improvement of the present invention is that: the feeding unit includes a fixed platform, a positioning frame is installed on the upper surface of the fixed platform, the upper surface of the positioning frame is provided with an entry groove for a single battery cell to enter, and a moving plate is provided on the inner side of the positioning frame by a lateral cylinder and moving towards the opening side.

[0015] A method of using a laser-assisted flying welding apparatus for lithium battery connectors, the method comprising the following steps: Step 1: Initially, the lifting plate is level with the fixed platform. After the battery casing is positioned and installed inside the lifting plate, the moving plate pushes the individual cells into the battery casing through the opening in sequence. Then, the lifting plate is raised to the same height as the support base. The electric gripper fixes the cover plate and then moves it down to the same height as the opening of the battery casing. Then, the suction plate attaches to the sides of the cover plate and fits it with the opening. The electric screwdriver installs the screws into the screw holes of the cover plate and the battery casing. Step 2: After the sliding plate moves the battery casing with the cover plate installed to directly above the positioning block at the end of the conveyor belt, the lifting plate lowers its height and installs the battery casing into the positioning block. Then, the two adjusting blocks move the positioning plates away from each other and continue to move down, so that the lifting plate is disconnected from the battery casing. Step 3: After the battery casing reaches the alignment chamber, the positioning pusher pushes the connecting piece into the limiting channel. The lifting cylinder pushes the top platform upward to squeeze the connecting piece upward and into the forming groove in the adsorption plate 2. The sliding seat slides to the underside of the support plate. After the flipping plate rotates 90 degrees clockwise, the adsorption plate 2 pulls the adsorbed connecting piece downward, and the connecting piece contacts the same polarity tabs on several battery cells. The connecting piece with the tabs enters the welding chamber for laser flying welding.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting an ejection unit, forming groove, and rotating support in the alignment chamber, the limiting channel initially constrains the entry direction and posture of the connecting piece, preventing the connecting piece from shifting. The positioning push block pushes the bottom connecting piece to the upper surface of the rotating support, which supports the connecting piece, ensuring uniform force during subsequent forming and movement. The lifting cylinder drives the top platform upward, pressing the connecting piece into the forming groove in the middle of the lower surface of the second adsorption plate, thus completing the shape correction of the connecting piece in the alignment chamber. The sliding seat moves to the bottom of the bearing plate, and the flipping plate rotates 90 degrees clockwise. During the downward movement of the second adsorption plate, the connecting piece is precisely attached to the same polarity tab position on several cells, reducing uneven welding quality caused by tab height tolerance or connecting piece deformation. The flatness, bending angle, and dimensional accuracy of the connecting piece are corrected before welding, avoiding welding focus shift due to connecting piece warping or dimensional deviation, and improving welding stability. 2. By setting up a docking and feeding unit, the battery casing is limited and installed by the lifting plate. The bottom surface of the inner cavity of the battery casing is consistent with the pushing path of the pushing unit. The pushing unit pushes the individual cells into the battery casing through the opening on the side of the battery casing facing the pushing unit in sequence, realizing the sequential filling of the cells. The lifting plate rises to the assembly height of the alignment unit, aligns the cover plate with the opening position of the battery casing and fixes it, so that the cover plate can be reliably inserted into the battery casing. The sliding plate slides along the base to one end of the conveying unit and descends at the same time, smoothly transferring the assembled battery casing to the conveying unit, so that the battery casing is accurately placed in the positioning blocks on the two conveyor belts. The battery casing maintains the predetermined posture during the conveying process. 3. By setting up an alignment and installation unit, the entry position of the cover plate is initially limited by the limiting slot. When the cover plate enters the clamping range of the electric gripper, the electric gripper clamps the bottom surface of the cover plate. Under the guidance of the vertical guide rail, the electric gripper moves the cover plate vertically downward, lowering it to the same height as the opening of the battery housing, so as to facilitate the subsequent alignment and installation of the cover plate and the battery housing. After the cover plate descends to the target height, the correction cylinder is activated and pushes the push plate forward. The adsorption plate adsorbs and fixes the sides of the cover plate. At this time, the electric gripper releases its clamping on the bottom surface of the cover plate and moves downward. Under the pushing action of the push plate, the cover plate is inserted and engaged with the opening of the battery housing. The wire feed cylinder is coaxially aligned with the screw holes on the cover plate and the battery housing. Under the pushing action of the feed cylinder, the electric screwdriver feeds along the direction of the wire feed cylinder and tightens the screws that have entered the screw holes, thereby achieving reliable fixation between the cover plate and the battery housing. Attached Figure Description

[0017] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the external structure of the present invention; Figure 2 For the present invention Figure 1 A magnified view of a section at point A in the middle; Figure 3 This is a schematic diagram of the installation structure of the lifting plate and the fixed platform of the present invention; Figure 4 This is a partial three-dimensional structural diagram of the mounting bracket of the present invention; Figure 5 This is a schematic diagram of the three-dimensional mounting structure of the card block of the present invention; Figure 6 For the present invention Figure 3 A magnified view of a section at point B in the middle; Figure 7 This is a cross-sectional view of the alignment chamber of the present invention; Figure 8 For the present invention Figure 7 A magnified view of a section at point C.

[0019] In the diagram: 1. Welding chamber; 2. Alignment chamber; 3. Conveyor frame; 4. Conveyor belt; 5. Positioning block; 6. Sliding plate; 7. Lifting plate; 8. Mounting frame plate; 9. Stroke cylinder; 10. Fixed platform; 11. Positioning frame; 12. Entry groove; 13. Limiting slot; 14. Positioning plate; 15. Clamping block; 16. Support seat; 17. Vertical guide rail; 18. Slide seat; 19. Electric gripper; 20. Adsorption plate one; 21. Wire feeder; 22. Electric screwdriver; 23. Push plate; 24. Placement port; 25. Side groove; 26. Tilting plate; 27. Sliding seat; 28. Adsorption plate two; 29. ​​Bearing plate; 30. Base support; 31. Top platform; 32. Guide side plate; 33. Positioning push block; 34. Lifting cylinder. Detailed Implementation

[0020] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0021] Please see Figures 1-8 As shown, the present invention provides a laser flying welding device for lithium battery connectors, including a welding chamber 1 mounted on a base, a conveying unit mounted on the base for sequentially conveying several lithium battery modules into the welding chamber 1, an alignment chamber 2 for aligning the connectors and lithium battery units on the side of the welding chamber 1 facing the conveying direction, and a docking and feeding unit slidably mounted on the side of the conveying unit away from the welding chamber 1. The docking and feeding unit includes a sliding plate 6 that slides along the base. The width of the sliding plate 6 is smaller than the width of the conveying unit. Above the sliding plate 6, there is a lifting plate 7 that moves in stages and fixes the battery casing. On one side of the lifting plate 7, there is a pushing unit for pushing several battery cells into the battery casing. The battery casing has an opening on the side facing the feeding unit; A mounting plate 8 is provided on one side above the feeding unit, and an alignment mounting unit for fixing the cover plate to the battery casing is installed on the lower surface of the mounting plate 8. The alignment chamber 2 is provided with a limiting channel for the entry of the connecting piece, and the alignment chamber 2 is also provided with an ejection unit for stamping the connecting piece. The ejection unit includes a sliding seat 27 that slides along the guide rail on the inner wall of the alignment chamber 2. A base support 30 is installed on the bottom surface of the sliding seat 27, and a lifting top platform 31 is embedded in the upper surface of the sliding seat 27. A lifting cylinder 34 that pushes the top platform 31 to move is installed on the base support 30. The alignment chamber 2 is equipped with a rotating support for supporting the connecting piece. Above the rotating support is an adsorption plate 28 that moves vertically to adsorb and fix the connecting piece. The lower surface of the adsorption plate 28 is provided with a forming groove that works in conjunction with the ejection unit. The inner wall of the alignment chamber 2 is fitted with a positioning pusher 33 that is driven by a pusher cylinder.

[0022] Initially, the sliding plate 6 and the lifting plate 7 are located on one side of the pushing unit. The battery housing is limited and installed by the lifting plate 7. The bottom surface of the inner cavity of the battery housing is consistent with the pushing path of the pushing unit. The pushing unit pushes the individual cells into the battery housing through the opening on the side of the battery housing facing the pushing unit in sequence, so as to realize the sequential filling of the cells and avoid the cells from tilting or misaligning during the assembly process.

[0023] After the battery cells are installed, the lifting plate 7 rises to the assembly height of the alignment unit. The alignment unit aligns and fixes the cover plate with the opening of the battery casing, so that the cover plate can be reliably inserted into the battery casing, thereby forming a battery module with a stable structure and consistent size, providing a stable assembly foundation for subsequent welding of connecting pieces.

[0024] Subsequently, the sliding plate 6 slides along the base to one end of the conveying unit and simultaneously descends in height, smoothly transferring the assembled battery casing onto the conveying unit until the lifting plate 7 is completely separated from the battery casing, avoiding structural interference during transport. The conveying unit continues to operate, transporting the battery casing to a position below the alignment chamber 2.

[0025] As the battery casing reaches the bottom of the alignment chamber 2, the connecting piece enters the alignment chamber 2 through the limiting channel. The limiting channel initially constrains the entry direction and posture of the connecting piece to prevent it from shifting, flipping, or exhibiting abnormal posture. Subsequently, the positioning push block 33 pushes the bottom connecting piece onto the upper surface of the rotating support, where the rotating support supports the connecting piece, ensuring that it is subjected to uniform force during subsequent forming and movement, preventing local warping or deformation.

[0026] At this time, the second adsorption plate 28, located above the rotating support, moves downward in the vertical direction to adsorb and fix the upper surface of the connecting piece, ensuring the stability of the connecting piece during the forming process. Next, the lifting cylinder 34 drives the top platform 31 upward, pressing the connecting piece into the forming groove in the middle of the lower surface of the second adsorption plate 28. This completes the shape correction of the connecting piece within the alignment chamber 2. By setting up the ejection unit, forming groove, and rotating support within the alignment chamber 2, the flatness, bending angle, and dimensional accuracy of the connecting piece are corrected before welding, preventing the welding focus from shifting due to warping or dimensional deviations of the connecting piece, thus improving welding stability.

[0027] After shape correction is completed, the sliding seat 27 moves along the guide rail on the inner wall of the alignment chamber 2 to directly below the support plate 29. The flipping plate 26 rotates 90 degrees clockwise. During the adsorption and downward movement of the adsorption plate 28, the connecting piece is precisely attached to the same polarity tab position on several cells, reducing the problem of uneven welding quality caused by tab height tolerance or connecting piece deformation. Through the coordinated cooperation of the top platform 31 and the forming groove, the connection piece and each tab are ensured to fit consistently, providing a stable and uniform welding interface for subsequent laser flying welding, thereby improving welding quality and consistency. The connecting piece is always under control during adsorption, support and forming, avoiding shaking or displacement during flipping, downward movement or attachment, thus structurally improving the reliability of the welding process.

[0028] See Figure 7 and Figure 8 As shown, the limiting channel includes a placement port 24, a guide side plate 32 is provided on one side of the placement port 24, a material conveying channel is provided between the guide side plate 32 and the rotating support, and a bearing plate 29 flush with the rotating support is provided below the placement port 24. The rotating support includes a side groove 25 on the inner wall of the alignment chamber 2. Two flip plates 26 are installed inside the side groove 25 by a rotary cylinder. The two flip plates 26 are fixed by a connecting rod, and the distance between the two flip plates 26 is less than the length of the connecting piece.

[0029] During operation, the connecting piece enters the alignment chamber 2 through the placement port 24. The placement port 24 provides an initial entry window for the connecting piece, allowing it to move downwards under gravity. The guide side plate 32 restricts the lateral position of the connecting piece, ensuring that it maintains a predetermined lateral posture during descent and transport, preventing tilting, lateral movement, or overturning.

[0030] Because the width of the conveying channel matches the width of the connecting piece, the connecting piece is constrained on both sides during the conveying process, thereby further ensuring its consistent posture before entering the rotating support.

[0031] When the connecting piece moves down the conveying channel to the position of the bearing plate 29, the bearing plate 29 temporarily supports the connecting piece, so that the connecting piece is in a stable transition state before entering the rotating support, preventing the connecting piece from being deformed by impact due to free fall.

[0032] When the connecting piece enters the flip plates 26 on both sides, its two ends are supported by the two flip plates 26 respectively. The flip plates 26 maintain the initial support angle under the drive of the rotary cylinder, forming a stable support for the connecting piece.

[0033] participate Figure 3 , Figure 4 and Figure 6As shown, the mounting unit includes a support base 16 mounted on the lower end of the mounting plate 8. The surface of the mounting plate 8 is provided with a limiting slot 13 for limiting the entry of the cover plate. A vertical guide rail 17 is mounted on the inner wall of the support base 16. A slide block 18 is slidably mounted on the vertical guide rail 17. An electric gripper 19 for clamping the bottom surface of the cover plate is mounted on the upper surface of the slide block 18. The inner side of the support base 16 near the rear side of the vertical guide rail 17 is provided with a push plate 23 pushed by a correction cylinder, and an adsorption plate 20 for adsorbing and fixing the side of the cover plate is installed on the inner side of the push plate 23. The surface of the support base 16 is provided with a wire feed spool 21 for screw insertion. The wire feed spool 21 is aligned with the screw holes on the cover plate and the battery housing. A feed cylinder is installed on the outer end face of the calibration cylinder. The push end of the feed cylinder is connected to an electric screwdriver 22 for tightening screws.

[0034] During operation, the cover plate is first vertically inserted into the limiting slot 13 on the surface of the mounting plate 8 via an external feeding mechanism or manual means. The limiting slot 13 initially limits the entry position of the cover plate, so that the cover plate maintains a predetermined posture in the vertical direction and prevents it from shifting or tilting.

[0035] In the initial state, the electric gripper 19 is located below the limiting slot 13. When the cover plate enters the clamping range of the electric gripper 19, the electric gripper 19 clamps the bottom surface of the cover plate, providing stable constraint to the cover plate in the vertical direction. Subsequently, guided by the vertical guide rail 17, the electric gripper 19 moves the cover plate downward in the vertical direction, lowering the cover plate to the same height as the opening of the battery casing, so as to facilitate the subsequent alignment and installation of the cover plate and the battery casing.

[0036] After the cover plate descends to the target height, the calibration cylinder actuates and pushes the push plate 23 forward. The adsorption plate 20 installed on the inner side of the push plate 23 adsorbs and fixes the side of the cover plate, thereby limiting and correcting the cover plate laterally through lateral adsorption. At this time, the electric gripper 19 releases its grip on the bottom surface of the cover plate and retracts downward, allowing the cover plate to engage with the opening of the battery casing under the pushing action of the push plate 23, thus completing the overall alignment of the cover plate in both the horizontal and vertical directions.

[0037] The screw feeder 21 provides an entry channel for the screw. The screw feeder 21 is coaxially aligned with the screw holes on the cover plate and the battery housing. Under the push of the feed cylinder, the electric screwdriver 22 feeds along the direction of the screw feeder 21 to tighten the screws that have entered the screw holes, thereby achieving reliable fixation between the cover plate and the battery housing.

[0038] After the screws are tightened, the electric screwdriver 22 and the feed cylinder are reset, the push plate 23 and the adsorption plate 20 are released from adsorption, and the installation unit is aligned to complete a complete cover plate assembly process, providing a battery module with stable structure and consistent size for the subsequent connecting piece welding process.

[0039] See Figure 1 As shown, the conveying unit includes two conveyor frames 3, and each conveyor frame 3 has a conveyor belt 4 installed on its inner wall. Several positioning blocks 5 that limit the position of the battery casing are installed on the conveyor belt 4. The gap length between the two conveyor belts 4 is greater than the width of the sliding plate 6.

[0040] After the loading unit completes the cell filling and cover plate fixing, the sliding plate 6 carries the battery casing along the base direction to the top of the conveying unit. During the descent, it passes through the gap between the two conveyor belts 4, so that the battery casing is accurately placed in the positioning block 5 on the two conveyor belts 4. This ensures that the battery casing maintains its predetermined posture during the conveying process. Since the gap width of the conveyor belts 4 is greater than the width of the sliding plate 6, the sliding plate 6 will not interfere with the conveyor belts 4 during the up and down movement, thus ensuring the smoothness of the battery casing transfer process.

[0041] The battery casing moves steadily along the predetermined conveying path and enters the designated positions of the alignment chamber 2 and the welding chamber 1 in sequence, providing an accurate conveying foundation for the subsequent alignment and welding processes of the connecting pieces.

[0042] See Figure 1 , Figure 3 and Figure 5 As shown, a stroke cylinder 9 for pushing the lifting plate 7 is installed in the middle of the upper surface of the sliding plate 6. An adjusting block that is threadedly connected to the bidirectional screw is embedded in the upper surface of the lifting plate 7. A positioning plate 14 is fixed at the upper end of the adjusting block. A locking block 15 is installed on the inner wall of the positioning plate 14. Both sides of the lower surface of the card block 15 are inclined outward and adapted to fit the groove of the battery housing.

[0043] Initially, the battery casing is installed on the lifting plate 7. The groove of the battery casing gradually enters the locking block 15 in the vertical direction. Utilizing the guiding effect of the inclined structure on the lower surface of the locking block 15, the locking block 15 automatically corrects its relative position with the battery casing during the process of entering the groove, avoiding jamming or skew. After the locking block 15 is fully inserted into the groove of the battery casing, the positioning plate 14 reliably limits the battery casing, keeping it stable during the movement of the sliding plate 6, the lifting plate 7, and subsequent assembly. The position of the adjusting block can be adjusted by the bidirectional screw to accommodate battery casings of different specifications or dimensional tolerances. When the battery casing has completed cell filling and cover fixing and needs to be transferred to the conveying unit, the stroke cylinder 9 reverses its action, driving the lifting plate 7 to descend, causing the locking block 15 to gradually disengage from the groove of the battery casing and smoothly exit under the guidance of the inclined structure, avoiding pulling or interference with the battery casing, thereby achieving smooth release of the battery casing.

[0044] See Figure 2 and Figure 3 As shown, the feeding unit includes a fixed platform 10, a positioning frame 11 is mounted on the upper surface of the fixed platform 10, an entry groove 12 for a single battery cell to enter is provided on the upper surface of the positioning frame 11, and a moving plate is provided on the inner side of the positioning frame 11, which is pushed by a lateral cylinder and moves toward the opening side.

[0045] During operation, a single battery cell enters the positioning frame 11 through the entry slot 12 and completes its initial positioning. Then, the lateral cylinder moves to push the moving plate to move horizontally toward the opening of the battery casing.

[0046] Driven by the moving plate, the battery cell moves smoothly along the predetermined pushing path and enters the inner cavity of the battery housing through the opening on the side of the battery housing facing the pushing unit. Because the positioning frame 11 provides circumferential restraint for the battery cell and the moving plate provides a stable pushing force, the battery cell maintains a stable posture during the process of entering the battery housing, avoiding tilting, jamming or collision.

[0047] Once a single cell has been filled, the lateral cylinder reverses its direction, causing the moving plate to reset. The positioning frame 11 then returns to the waiting state, allowing the next cell to enter and repeat the pushing process, thereby achieving sequential and orderly filling of multiple cells into the battery casing.

[0048] This invention provides a method of using a laser flying welding device for lithium battery connectors, the method comprising the following steps: Step 1: Initially, the height of the lifting plate 7 is flush with that of the fixed platform 10. After the battery casing is positioned and installed in the lifting plate 7, the moving plate pushes the individual cells into the battery casing through the opening in sequence. Then, the lifting plate 7 is raised to the same height as the support base 16. The electric gripper 19 fixes the cover plate and then moves it down to the same height as the opening of the battery casing. Then, the suction plate 20 suctions the side of the cover plate and installs it to fit the opening. The electric screwdriver 22 installs the screws into the screw holes of the cover plate and the battery casing. Step 2: After the sliding plate 6 moves the battery casing with the cover plate installed to directly above the positioning block 5 at the end of the conveyor belt 4, the lifting plate 7 lowers its height and installs the battery casing into the positioning block 5. Then, the two adjusting blocks drive the positioning plates 14 away from each other and continue to move down, so that the lifting plate 7 is disconnected from the battery casing. Step 3: After the battery casing reaches the alignment chamber 2, the positioning push block 33 pushes the connecting piece into the limiting channel. The lifting cylinder 34 pushes the top platform 31 upward to squeeze the connecting piece upward and into the forming groove in the adsorption plate 28. The sliding seat 27 slides to the underside of the support plate 29. After the flipping plate 26 rotates 90 degrees clockwise, the adsorption plate 28 pulls the adsorbed connecting piece downward, so that the connecting piece contacts the same polarity tab on several battery cells. The connecting piece with the tab enters the welding chamber 1 for laser flying welding.

[0049] In use, this invention employs an ejection unit, a forming groove, and a rotating support within the alignment chamber 2. A limiting channel initially constrains the entry direction and posture of the connecting piece, preventing it from shifting. The positioning pusher 33 pushes the lowermost connecting piece onto the upper surface of the rotating support, which then supports it, ensuring uniform force distribution during subsequent forming and movement. The lifting cylinder 34 drives the top platform 31 upwards, pressing the connecting piece into the forming groove in the center of the lower surface of the adsorption plate 28, thereby... The shape of the connecting piece is corrected in the alignment chamber 2. The sliding seat 27 moves to the underside of the support plate 29. The flipping plate 26 rotates 90 degrees clockwise. During the downward movement of the adsorption plate 28, the connecting piece is precisely attached to the same polarity tab position on several cells. This reduces the problem of uneven welding quality caused by tab height tolerance or connecting piece deformation. The flatness, bending angle and dimensional accuracy of the connecting piece are corrected before welding. This avoids the welding focus shift caused by connecting piece warping or dimensional deviation, and improves welding stability. By setting up a docking and feeding unit, the battery casing is limited and installed by the lifting plate 7. The bottom surface of the inner cavity of the battery casing is consistent with the pushing path of the pushing unit. The pushing unit pushes the individual cells into the battery casing through the opening on the side of the battery casing facing the pushing unit in sequence, realizing the sequential filling of the cells. The lifting plate 7 rises to the assembly height of the installation unit, aligns the cover plate with the opening position of the battery casing and fixes it, so that the cover plate can be reliably inserted into the battery casing. The sliding plate 6 slides along the base to one end of the conveying unit and descends at the same time, smoothly transferring the assembled battery casing to the conveying unit, so that the battery casing is accurately placed in the positioning block 5 on the two conveyor belts 4. The battery casing maintains the predetermined posture during the conveying process. By setting up an alignment unit, the limiting slot 13 initially limits the entry position of the cover plate. After the cover plate enters the clamping range of the electric gripper 19, the electric gripper 19 clamps the bottom surface of the cover plate. Under the guidance of the vertical guide rail 17, the electric gripper 19 moves the cover plate vertically downward, lowering it to the same height as the opening of the battery casing, so as to facilitate the subsequent alignment and installation of the cover plate with the battery casing. After the cover plate is lowered to the target height, the correction cylinder actuates and pushes the push plate 23 towards the target height. In the forward motion, the adsorption plate 20 adsorbs and fixes the side of the cover plate. At this time, the electric gripper 19 releases its grip on the bottom surface of the cover plate and moves downward. Under the pushing action of the push plate 23, the cover plate is inserted and engaged with the opening of the battery housing. The wire feeding drum 21 is coaxially aligned with the screw holes on the cover plate and the battery housing. Under the pushing action of the feed cylinder, the electric screwdriver 22 feeds along the direction of the wire feeding drum 21 and tightens the screws that have entered the screw holes, thereby achieving reliable fixation between the cover plate and the battery housing.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A laser-flying welding device for lithium battery connectors, comprising a welding chamber (1) mounted on a base and a conveying unit for sequentially conveying a plurality of lithium battery modules into the welding chamber (1), characterized in that: The welding chamber (1) is provided with an alignment chamber (2) for aligning the connecting piece and the lithium battery unit on the side facing the conveying direction, and a docking feeding unit is provided on the side of the conveying unit away from the welding chamber (1). The docking and feeding unit includes a sliding plate (6) that slides along the base. The width of the sliding plate (6) is smaller than the width of the conveying unit. Above the sliding plate (6) is a lifting plate (7) that moves in stages and fixes the battery casing. On one side of the lifting plate (7) is a pushing unit for pushing several battery cells into the battery casing. The battery casing has an opening on the side facing the feeding unit; A mounting plate (8) is provided on one side above the material pushing unit, and an alignment mounting unit for fixing the cover plate to the battery casing is installed on the lower surface of the mounting plate (8). The alignment chamber (2) is provided with a limiting channel for the entry of the connecting piece, and the alignment chamber (2) is also provided with an ejection unit for stamping the connecting piece. The ejection unit includes a sliding seat (27) that slides along the guide rail on the inner wall of the alignment chamber (2). A base support (30) is installed on the bottom surface of the sliding seat (27), and a lifting top platform (31) is embedded in the upper surface of the sliding seat (27). A lifting cylinder (34) that pushes the top platform (31) to move is installed on the base support (30). The alignment chamber (2) is provided with a rotating support for supporting the connecting piece. Above the rotating support is an adsorption plate (28) that moves vertically to adsorb and fix the connecting piece. The lower surface of the adsorption plate (28) is provided with a forming groove that works in conjunction with the ejection unit. The inner wall of the alignment chamber (2) is fitted with a positioning push block (33) that is pushed by a pusher cylinder.

2. The laser flying welding device for lithium battery connectors according to claim 1, characterized in that, The limiting channel includes a placement port (24), a guide side plate (32) is provided on one side of the placement port (24), a material conveying channel is provided between the guide side plate (32) and the rotating support, and a bearing plate (29) flush with the rotating support is provided below the placement port (24).

3. The laser flying welding device for lithium battery connectors according to claim 2, characterized in that, The rotating support includes a side groove (25) on the inner wall of the alignment chamber (2). Two flip plates (26) are installed inside the side groove (25) by a rotary cylinder. The two flip plates (26) are fixed by a connecting rod, and the distance between the two flip plates (26) is less than the length of the connecting piece.

4. The laser flying welding device for lithium battery connectors according to claim 3, characterized in that, The mounting unit includes a support base (16) mounted on the lower end of the mounting plate (8). The surface of the mounting plate (8) is provided with a limiting slot (13) for limiting the entry of the cover plate. A vertical guide rail (17) is mounted on the inner wall of the support base (16). A slide block (18) is slidably mounted on the vertical guide rail (17). An electric gripper (19) for clamping the bottom surface of the cover plate is mounted on the upper surface of the slide block (18).

5. A laser-flying welding device for lithium battery connectors according to claim 4, characterized in that, The inner side of the support base (16) near the rear side of the vertical guide rail (17) is provided with a push plate (23) pushed by a correction cylinder. An adsorption plate (20) for adsorbing and fixing the side of the cover plate is installed on the inner side of the push plate (23). The surface of the support base (16) is provided with a wire feed tube (21) for screw insertion. The wire feed tube (21) is aligned with the screw holes on the cover plate and the battery housing. A feed cylinder is installed on the outer end face of the calibration cylinder. The push end of the feed cylinder is connected to an electric screwdriver (22) for tightening screws.

6. A laser-flying welding device for lithium battery connectors according to claim 5, characterized in that, The conveying unit includes two conveyor frames (3), and each conveyor frame (3) has a conveyor belt (4) installed on its inner wall. Several positioning blocks (5) that limit the battery casing are installed on the conveyor belt (4). The gap length between the two conveyor belts (4) is greater than the width of the sliding plate (6).

7. A laser flying welding device for lithium battery connectors according to claim 6, characterized in that, A stroke cylinder (9) for pushing the lifting plate (7) is installed in the middle of the upper surface of the sliding plate (6). An adjusting block that is threadedly connected to the bidirectional screw is embedded in the upper surface of the lifting plate (7). A positioning plate (14) is fixed at the upper end of the adjusting block. A locking block (15) is installed on the inner wall of the positioning plate (14). Both sides of the lower surface of the card block (15) are inclined outward and adapted to the groove of the battery casing.

8. A laser-flying welding device for lithium battery connectors according to claim 7, characterized in that, The feeding unit includes a fixed platform (10), on the upper surface of which a positioning frame (11) is installed. The upper surface of the positioning frame (11) is provided with an entry slot (12) for a single battery cell to enter. The inner side of the positioning frame (11) is provided with a moving plate that is pushed by a lateral cylinder and moves toward the opening side.

9. A method of using a laser-flying welding apparatus for lithium battery connectors, based on the laser-flying welding apparatus for lithium battery connectors as described in claim 8, characterized in that, The usage method includes the following steps: Step 1: Initially, the height of the lifting plate (7) is level with that of the fixed platform (10). After the battery casing is positioned and installed in the lifting plate (7), the moving plate pushes the individual cells from the opening into the battery casing in sequence. Then the lifting plate (7) is raised to the same height as the support base (16). The electric gripper (19) fixes the cover plate and then moves it down to the same height as the opening of the battery casing. Then the suction plate (20) suctions the side of the cover plate and installs it to fit the opening. The electric screwdriver (22) installs the screws into the screw holes of the cover plate and the battery casing. Step 2: After the sliding plate (6) moves the battery casing after the cover plate is installed to the position block (5) at the end of the conveyor belt (4), the lifting plate (7) lowers its height and installs the battery casing into the position block (5). Then, the two adjusting blocks drive the positioning plate (14) to move away from each other and continue to move down, so that the lifting plate (7) is disconnected from the battery casing. Step 3: After the battery casing reaches the alignment chamber (2), the positioning push block (33) pushes the connecting piece into the limiting channel. The lifting cylinder (34) pushes the top platform (31) upward to squeeze the connecting piece upward and into the forming groove in the adsorption plate (28). The sliding seat (27) slides to the bottom of the support plate (29). After the flip plate (26) rotates 90 degrees clockwise, the adsorption plate (28) pulls the adsorbed connecting piece downward and contacts the connecting piece with the same polarity tab on several battery cells. The connecting piece with the tab enters the welding chamber (1) for laser flying welding.

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