A core-joining device and its core-joining process for butterfly welding of battery cells

Abstract

This invention discloses a core-joining device and process for butterfly welding of battery cells, comprising a worktable, a first rotating plate, a second rotating plate, a core-joining pad, and a top cover follower device. The first and second rotating plates are spaced apart on the upper surface of the worktable. The first and second rotating plates move synchronously in opposite directions along the horizontal longitudinal direction via a moving and flipping mechanism, and then synchronously flip in opposite directions along the vertical direction. A core-joining pad is respectively positioned at the middle of the upper surfaces of the first and second rotating plates. A longitudinal positioning mechanism is provided on the upper surface of the worktable relative to the first and second rotating plates to longitudinally position the battery cell. A transverse positioning mechanism is provided on the upper surfaces of the first and second rotating plates to laterally position the battery cell. A top cover follower device is provided on the upper surface of the worktable, and the top cover follower device moves vertically up and down to ensure the tab posture. This invention facilitates the core-joining process and also facilitates the removal of the battery cell from above.

Description

Technical Field

[0001] This invention relates to the field of battery cell bonding technology, specifically to a bonding device and bonding process for butterfly welding of battery cells. Background Technology

[0002] In the manufacturing process of new high-capacity energy storage batteries, the current equipment adopts a butterfly welding method for positive and negative electrode adapters. This requires the battery cell to complete the core-combining process of two cells, and after core-combining, ensure the alignment of the two cells with the top cover follow-up device, as well as the consistent bending state of the dozens of layers of electrode tabs of the battery cell, all of which bend outwards.

[0003] However, existing technologies result in poor alignment during cell assembly, leading to unstable assembly progress and impacting subsequent manufacturing processes. Furthermore, the assembly process cannot guarantee the proper bending of the cell tabs, causing some tabs to fold inwards, posing a safety hazard of short circuits between the tabs and electrodes. Therefore, these issues urgently need to be addressed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a core-joining device and core-joining process for butterfly welding of battery cells. The device has a simple structure, which facilitates the core-joining action of the battery cells and also makes it easy to remove the battery cells from above.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The innovative feature of the present invention is that it includes a worktable, a first rotating plate, a second rotating plate, a moving and flipping mechanism, a core-joining pad, and a top cover follow-up device; the first rotating plate and the second rotating plate are symmetrically arranged horizontally at intervals on the upper surface of the horizontally arranged worktable; the first rotating plate and the second rotating plate are adjusted by synchronously moving in opposite directions along the horizontal longitudinal direction through the moving and flipping mechanism to adjust their spacing, and then synchronously rotating in opposite directions along the vertical direction to complete the core joining; at the middle position of the upper surface of the first rotating plate and the second rotating plate, a horizontal longitudinal support is respectively provided for the core joining. The worktable includes matching core-fitting pads, with two pads symmetrically arranged front and back. A longitudinal positioning mechanism is provided between the first and second rotating plates on the upper surface of the worktable, longitudinally positioning the battery cells placed on the core-fitting pads. Lateral positioning mechanisms are provided on the upper surfaces of the first and second rotating plates, laterally positioning the battery cells placed on the core-fitting pads before clamping and fixing them. A top cover follower device is also horizontally spaced between the two core-fitting pads on the upper surface of the worktable, moving vertically up and down to ensure the tab posture during the core-fitting process.

[0006] The moving and flipping mechanism includes a first moving plate and a second moving plate; a first moving plate matching the first rotating plate is horizontally spaced between the first rotating plate and the upper surface of the worktable. The length of the first moving plate is greater than the length of the first rotating plate, and its width is less than the width of the first rotating plate, ensuring that its side closest to the center of the worktable is vertically aligned with the corresponding side of the first rotating plate; a second moving plate matching the second rotating plate is horizontally spaced between the second rotating plate and the upper surface of the worktable. The length of the second moving plate is greater than the length of the second rotating plate, and its width is less than the width of the second rotating plate, ensuring that its side closest to the center of the worktable is vertically aligned with the corresponding side of the second rotating plate.

[0007] The longitudinal positioning mechanism includes a second cylinder, a positioning gripper, a rodless cylinder, and a rodless cylinder mounting base. A rodless cylinder is also horizontally spaced between the first and second moving plates on the upper surface of the worktable. The rodless cylinder is powered by compressed air. The rodless cylinder mounting base is sleeved on the rodless cylinder, and the rodless cylinder performs horizontal reciprocating motion on the upper surface of the worktable, without interfering with the movements of the top cover follow-up device, the first moving plate, the second moving plate, the first rotating plate, and the second rotating plate. The upper surface of the rod cylinder mounting base is also horizontally provided with a second cylinder, and the stroke of the rodless cylinder must ensure that the second cylinder can retract to one side of the worktable and does not interfere with the vertical up and down movement of the top cover follower device; the opening end of the second cylinder is respectively set towards the core-fitting plate, and positioning claws are also horizontally provided on it at intervals, and the two positioning claws are driven to open and close to perform longitudinal positioning of the battery cell placed on the core-fitting plate, thereby ensuring the alignment of the battery cell, and the height of the battery cell tab is made consistent with the rotation axis by the core-fitting plate.

[0008] Preferably, the moving and flipping mechanism further includes a second slide rail, a second slider, and a forward and reverse lead screw device; the first moving plate and the second moving plate do not interfere with the vertical up and down movement of the top cover follow-up device and the longitudinal positioning movement of the longitudinal positioning mechanism, and the upper surface of the worktable is symmetrically provided with second slide rails at horizontal longitudinal intervals on the left and right sides, and the lower surface of the first moving plate and the second moving plate is provided with second sliders at intervals on the left and right sides relative to the positions of the second slide rails, each of the second sliders matching the corresponding second slide rail, and the first moving plate and the second moving plate are respectively connected by a screw. The second slider is horizontally and longitudinally connected to the two second slide rails; a positive and negative lead screw device is also horizontally and longitudinally provided on the inner top surface of the worktable between the two second slide rails, and the moving end of the positive and negative lead screw device extends out of the upper surface of the worktable. The lower surface of the first moving plate is connected to the forward moving end of the positive and negative lead screw device, and the lower surface of the second moving plate is connected to the reverse moving end of the positive and negative lead screw device. Thus, under the drive of the positive and negative lead screw device, the first moving plate and the second moving plate move horizontally and longitudinally towards each other or away from each other to adjust the longitudinal distance between the first moving plate and the second moving plate.

[0009] Preferably, the assembly further includes a first rotary axis drive motor assembly, a first rotary driven seat assembly, a first connecting block, a second rotary axis drive motor assembly, a second connecting block, and a second rotary driven seat assembly; a first rotary driven seat assembly is also vertically arranged on the left edge of the upper surface of the first movable plate, and the rotating end of the first rotary driven seat assembly is connected to the corresponding side of the first rotary plate through the first connecting block; a first rotary axis drive motor assembly is also horizontally and longitudinally slidably arranged on the inner bottom surface of the worktable on the side of the first rotary driven seat assembly, the sliding action of the first rotary axis drive motor assembly is synchronized with the horizontal and longitudinal movement of the first movable plate, and its output end is linked with the first rotary driven seat assembly. This drives the first rotary follower assembly to rotate the first rotating plate vertically. A second rotary follower assembly is also vertically positioned on the right edge of the upper surface of the second moving plate, and the rotating end of the second rotary follower assembly is connected to the corresponding side of the second rotating plate via a second connecting block. A second rotary shaft drive motor assembly is also horizontally and longitudinally slidably positioned on the inner bottom surface of the worktable near the second rotary follower assembly. The sliding motion of the second rotary shaft drive motor assembly is synchronized with the horizontal longitudinal movement of the second moving plate, and its output end is linked with the second rotary follower assembly, thereby driving the second rotary follower assembly to rotate the second rotating plate vertically.

[0010] Preferably, it further includes rotational hard stops; two rotational hard stops are respectively provided at the front edge of the lower surface of the first rotating plate and at the rear edge of the lower surface of the second rotating plate, and the four rotational hard stops are respectively fixedly arranged on the upper surface of the worktable, and do not interfere with the horizontal longitudinal movement of the corresponding first and second moving plates; the four rotational hard stops are all spaced between the two second slide rails, and their heights correspond to the distance between the first rotating plate and the upper surface of the worktable when in a horizontal state, thereby limiting the back-to-back flipping of the first and second rotating plates respectively.

[0011] Preferably, both the first rotary shaft drive motor assembly and the second rotary shaft drive motor assembly are composed of a motor and a right-angle reducer.

[0012] Preferably, each of the lateral positioning mechanisms includes a cell positioning block and a cell positioning mechanism; four rectangular cell positioning blocks are respectively provided in the middle of the upper surface of the first rotating plate and the second rotating plate, and each of the four adjacent cell positioning blocks is respectively located at the four right angles of the corresponding core-combining pad, and an arc-shaped groove matching the cell is embedded in the upper part of the side facing the core-combining pad, thereby performing a first lateral positioning of the cell placed on the corresponding core-combining pad; cell positioning mechanisms are respectively provided on the upper surface of the first rotating plate and the second rotating plate relative to the left and right sides of the corresponding core-combining pad, and each cell positioning mechanism is set independently of the corresponding cell positioning block, the fixed end of each cell positioning mechanism is fixedly connected to the upper surface of the corresponding first rotating plate or the second rotating plate, and its positioning end moves horizontally in the direction of the corresponding core-combining pad, thereby performing a second lateral positioning of the cell placed on the corresponding core-combining pad and clamping and fixing the corresponding cell.

[0013] Preferably, each of the battery cell positioning mechanisms includes a first cylinder, a first slide rail, a first slider, and a first positioning block; first cylinders are also respectively provided on the upper surfaces of the first and second rotating plates relative to the left and right sides of the corresponding core-combining pad, each first cylinder being fixedly disposed on the upper surface of the first or second rotating plate relative to the two corresponding battery cell positioning blocks, and its telescopic ends moving horizontally towards the corresponding core-combining pad, and being screwed to the corresponding first positioning block arranged horizontally in the longitudinal direction; the longitudinal width of each first positioning block matches the distance between the two corresponding battery cell positioning blocks, and each battery cell positioning block does not interfere with the horizontal movement of the corresponding first positioning block, and in each The upper surface of the first positioning block facing the core pad is also provided with an arc-shaped groove that matches the battery cell. On the lower surface of each first positioning block, four first sliders are provided in a rectangle. On the upper surface of the first rotating plate and the second rotating plate, two first slide rails are provided horizontally at intervals relative to the position of the corresponding first positioning block. Each first slide rail is configured to not interfere with the corresponding first cylinder and the corresponding battery cell positioning block. Each first slide rail matches the corresponding first slider, and the distance between each two adjacent first slide rails corresponds to the distance between the two corresponding front and rear first sliders. Thus, the stability of the horizontal movement of the corresponding first positioning block is ensured by the cooperation of the first slider and the first slide rail.

[0014] Preferably, it also includes a Z-axis adjustment device; a Z-axis adjustment device is also provided on the inner top surface of the worktable at the position relative to the top cover follower device, and the Z-axis adjustment device and the positive and negative lead screw device are set without interference; the adjustment end of the Z-axis adjustment device extends vertically upward from the upper surface of the worktable and is connected to the top cover follower device, driving the top cover follower device to move vertically up and down, thereby ensuring the electrode posture through the top cover follower device during the core-closing process.

[0015] The present invention provides a core-joining process for a core-joining device for butterfly welding of battery cells, the innovation of which lies in including the following steps:

[0016] Step 1: First, place the incoming battery cells horizontally and vertically on the corresponding core-combining pads, and then perform a horizontal positioning using the battery cell positioning blocks;

[0017] Step 2: Driven by the rodless cylinder, the second cylinder moves horizontally towards the center of the worktable via the rodless cylinder mounting base. Then, driven by the second cylinder, the positioning jaws open to perform longitudinal positioning of the battery cell, thereby ensuring the alignment of the battery cell.

[0018] Step 3: Driven by the first cylinder, the battery cell is laterally positioned a second time by the first positioning block, and the corresponding battery cell is clamped and fixed.

[0019] Step 4: Driven by the rodless cylinder, the second cylinder is moved to one side of the worktable via the rodless cylinder mounting seat, ensuring that it does not interfere with the vertical up and down movement of the top cover follower device;

[0020] Step 5: Driven by the positive and negative lead screw device, the first moving plate and the second moving plate are controlled to move horizontally and longitudinally towards each other or away from each other according to the state of the battery cell when it is in the core, thereby adjusting the relative position between the battery cells and ensuring the relative position of the tabs.

[0021] Step Six: Driven by the first and second rotary axis drive motors, the first and second rotary plates rotate 90° upwards along the vertical direction to complete the core assembly; during this process, the height of the top cover follower device is adjusted by the Z-axis adjustment device to ensure the attitude of the tabs.

[0022] The beneficial effects of this invention are:

[0023] (1) The present invention has a simple structure, which makes it easy for the battery cell to complete the core-combining action and also makes it easy for the battery cell to be removed from the top;

[0024] (2) The present invention can stably control the bending state of the tabs, thereby reducing the risk of battery short circuit;

[0025] (3) The present invention can stably control the alignment of the battery cell and the top cover follower device, thereby meeting the needs of the subsequent process.

[0026] (4) By setting the core-fitting pad, the present invention can not only raise the height of the battery cell tab to be consistent with the axis of rotation, but also facilitate the mechanical claw to grasp the battery cell;

[0027] (5) The present invention uses the positive and negative lead screw device, the second slider and the second slide rail to adjust the distance between the first moving plate and the second moving plate, thereby adjusting the state of the battery cell when the cells are combined and ensuring the posture of the tabs. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a schematic diagram of the core bonding device for butterfly welding of battery cells according to the present invention.

[0029] Figure 2 for Figure 1 Side view.

[0030] Among them, 1-first rotary shaft drive motor assembly; 2-cell positioning stop; 3-core bonding pad; 4-second rotary plate; 5-cell positioning mechanism; 6-first rotary driven seat assembly; 7-second rotary shaft drive motor assembly; 8-top cover follower device; 9-first rotary plate; 10-longitudinal positioning mechanism; 11-rotation hard limit; 12-worktable; 13-second rotary driven seat assembly; 14-first moving plate; 15-second slide rail; 16-positive and negative lead screw device; 17-Z-axis adjustment device; 18-second moving plate. Detailed Implementation

[0031] The technical solution of the present invention will be clearly and completely described below through specific embodiments.

[0032] The present invention provides a core-joining device for butterfly welding of battery cells, comprising a worktable 12, a first rotating plate 9, a second rotating plate 4, a moving and flipping mechanism, a core-joining pad 3, and a top cover follow-up device 8; the specific structure is as follows: Figure 1 , Figure 2 As shown, the workbench 12 is a horizontally arranged hollow cuboid frame structure, with a first rotating plate 9 and a second rotating plate 4 symmetrically arranged horizontally at intervals on its upper surface. The first rotating plate 9 and the second rotating plate 4 are adjusted by moving and flipping synchronously in opposite directions along the horizontal longitudinal direction through a moving and flipping mechanism, and then synchronously rotating in opposite directions along the vertical direction to complete the core joining. At the middle position of the upper surface of the first rotating plate 9 and the second rotating plate 4, a core joining pad 3 matching the battery cell is also arranged horizontally in the middle, and the two core joining pads 3 are symmetrically arranged front and back. On the upper surface of the workbench 12, relative to A longitudinal positioning mechanism 10 is also provided between the first rotating plate 9 and the second rotating plate 4, and the battery cell placed on the core-combining pad 3 is longitudinally positioned by the longitudinal positioning mechanism 10; a transverse positioning mechanism is provided on the upper surface of the first rotating plate 9 and the second rotating plate 4, and the battery cell placed on the core-combining pad 3 is laterally positioned by the transverse positioning mechanism and then clamped and fixed; a top cover follower device 8 is also provided horizontally and laterally between the two core-combining pads 3 on the upper surface of the worktable 12, and the top cover follower device 8 moves vertically up and down, and ensures the posture of the electrode tab during the core-combining process.

[0033] The movable flipping mechanism includes a second slide rail 15, a first movable plate 14, a second movable plate 18, a second slider, a positive and negative lead screw device 16, a first rotary shaft drive motor assembly 1, a first rotary driven seat assembly 6, a first connecting block, a second rotary shaft drive motor assembly 7, a second connecting block, a second rotary driven seat assembly 13, and a rotary hard limit 11; as shown. Figure 1 , Figure 2As shown, a first movable plate 14 matching the first rotating plate 9 is horizontally spaced between the upper surface of the first rotating plate 9 and the worktable 12. The length of the first movable plate 14 is greater than the length of the first rotating plate 9, and its width is less than the width of the first rotating plate 9. It is ensured that its side closest to the center of the worktable 12 is vertically aligned with the corresponding side of the first rotating plate 9. A second movable plate 18 matching the second rotating plate 4 is horizontally spaced between the upper surface of the second rotating plate 4 and the worktable 12. The length of the second movable plate 18 is greater than the length of the second rotating plate 4, and its width is less than the width of the second rotating plate 4. It is ensured that its side closest to the center of the worktable 12 is vertically aligned with the corresponding side of the second rotating plate 4.

[0034] like Figure 1 , Figure 2 As shown, both the first moving plate 14 and the second moving plate 18 do not interfere with the vertical up-and-down movement of the top cover follower device 8 or the longitudinal positioning movement of the longitudinal positioning mechanism 10. Furthermore, second slide rails 15 are symmetrically arranged horizontally and longitudinally on the left and right sides of the upper surface of the worktable 12. Second sliders are also arranged at intervals on the left and right sides of the lower surfaces of the first moving plate 14 and the second moving plate 18 relative to the positions of the second slide rails 15. Each second slider matches a corresponding second slide rail 15. The first moving plate 14 and the second moving plate 18 are respectively connected to the two second slide rails 15 horizontally and longitudinally via the second sliders. Sliding connection; a forward and reverse lead screw device 16 is also provided horizontally and longitudinally between the two second slide rails 15 on the inner top surface of the worktable 12, and the moving end of the forward and reverse lead screw device 16 extends out of the upper surface of the worktable 12. The lower surface of the first moving plate 14 is connected to the forward moving end of the forward and reverse lead screw device 16, and the lower surface of the second moving plate 18 is connected to the reverse moving end of the forward and reverse lead screw device 16. Thus, driven by the forward and reverse lead screw device 16, the first moving plate 14 and the second moving plate 18 move horizontally and longitudinally towards each other or away from each other to adjust the longitudinal distance between the first moving plate 14 and the second moving plate 18.

[0035] like Figure 1 , Figure 2As shown, a first rotary driven seat assembly 6 is vertically provided on the left edge of the upper surface of the first movable plate 14, and the rotating end of the first rotary driven seat assembly 6 is connected to the corresponding side of the first rotating plate 9 through a first connecting block; a first rotary shaft drive motor assembly 1 is also horizontally and longitudinally slidably provided on the inner bottom surface of the worktable 12 near the first rotary driven seat assembly 6, the sliding action of the first rotary shaft drive motor assembly 1 is synchronized with the horizontal longitudinal movement of the first movable plate 14, and its output end is linked with the first rotary driven seat assembly 6, thereby driving the first rotary driven seat assembly 6 to drive the first rotating plate 9 to rotate vertically; A second rotary driven seat assembly 13 is vertically mounted on the right edge of the upper surface of the second movable plate 18, and the rotating end of the second rotary driven seat assembly 13 is connected to the corresponding side of the second rotating plate 4 via a second connecting block. A second rotary shaft drive motor assembly 7 is also horizontally and longitudinally slidably mounted on the inner bottom surface of the worktable 12 near the second rotary driven seat assembly 13. The sliding action of the second rotary shaft drive motor assembly 7 is synchronized with the horizontal longitudinal movement of the second movable plate 18, and its output end is linked with the second rotary driven seat assembly 13, thereby driving the second rotary driven seat assembly 13 to drive the second rotating plate 4 to rotate vertically. Both the first rotary shaft drive motor assembly 1 and the second rotary shaft drive motor assembly 7 are composed of a motor and a right-angle reducer.

[0036] like Figure 1 , Figure 2 As shown, two rotational hard limiters 11 are respectively provided at the front edge of the lower surface of the first rotating plate 9 and at the rear edge of the lower surface of the second rotating plate 4. The four rotational hard limiters 11 are respectively fixedly installed on the upper surface of the worktable 12, and do not interfere with the horizontal longitudinal movement of the corresponding first moving plate 14 and second moving plate 18. The four rotational hard limiters 11 are all spaced between the two second slide rails 15, and their heights correspond to the distance between the upper surface of the first rotating plate 9 and the worktable 12 when they are in a horizontal state, thereby limiting the back-to-back flipping of the first rotating plate 9 and the second rotating plate 4.

[0037] Each lateral positioning mechanism of the present invention includes a cell positioning block 2 and a cell positioning mechanism 5; for example Figure 1As shown, four rectangular battery cell positioning blocks 2 are respectively provided in the middle of the upper surface of the first rotating plate 9 and the second rotating plate 4. Each of the four adjacent battery cell positioning blocks 2 is respectively located at the four right angles of the corresponding core-combining pad 3. An arc-shaped groove matching the battery cell is also embedded in the upper part of the side facing the core-combining pad 3, thereby performing a first lateral positioning of the battery cell placed on the corresponding core-combining pad 3. Battery cell positioning mechanisms 5 are also provided on the upper surface of the first rotating plate 9 and the second rotating plate 4 on the left and right sides of the corresponding core-combining pad 3. Each battery cell positioning mechanism 5 is set independently of the corresponding battery cell positioning block 2. The fixed end of each battery cell positioning mechanism 5 is fixedly connected to the upper surface of the corresponding first rotating plate 9 or the second rotating plate 4, and its positioning end moves horizontally in the direction of the corresponding core-combining pad 3, thereby performing a second lateral positioning of the battery cell placed on the corresponding core-combining pad 3 and clamping and fixing the corresponding battery cell.

[0038] Each cell positioning mechanism 5 includes a first cylinder, a first slide rail, a first slider, and a first positioning block; for example... Figure 1 , Figure 2 As shown, first cylinders are respectively provided on the upper surfaces of the first rotating plate 9 and the second rotating plate 4 on the left and right sides of the corresponding core-combining pad 3. Each first cylinder is fixedly disposed on the upper surface of the first rotating plate 9 or the second rotating plate 4 between the corresponding two cell positioning blocks 2, and its telescopic end moves horizontally in the direction of the corresponding core-combining pad 3, and is screwed to the corresponding first positioning block arranged horizontally in the longitudinal direction. The longitudinal width of each first positioning block matches the distance between the corresponding two cell positioning blocks 2, and each cell positioning block 2 does not interfere with the horizontal movement of the corresponding first positioning block, and on the side of each first positioning block facing the core-combining pad 3. The upper surface of each first positioning block is also embedded with an arc-shaped groove that matches the battery cell; four first sliders are rectangularly arranged on the lower surface of each first positioning block; and two first slide rails are horizontally spaced at intervals on the upper surfaces of the first rotating plate 9 and the second rotating plate 4 relative to the position of the corresponding first positioning block. Each first slide rail is set independently of the corresponding first cylinder and the corresponding battery cell positioning block 2. Each first slide rail matches the corresponding first slider, and the distance between each pair of adjacent first slide rails corresponds to the distance between the corresponding pair of front and rear first sliders. Thus, the stability of the horizontal movement of the corresponding first positioning block is ensured through the cooperation of the first slider and the first slide rail.

[0039] The longitudinal positioning mechanism 10 of the present invention includes a second cylinder, a positioning gripper, a rodless cylinder, and a rodless cylinder mounting base; as shown Figure 1As shown, a rodless cylinder is horizontally spaced between the first moving plate 14 and the second moving plate 18 on the upper surface of the workbench 12. The rodless cylinder is powered by compressed air. The rodless cylinder mounting seat is sleeved on the rodless cylinder. The rodless cylinder performs horizontal reciprocating motion on the upper surface of the workbench 12 and does not interfere with the movements of the top cover follower device 8, the first moving plate 14, the second moving plate 18, the first rotating plate 9, and the second rotating plate 4. A second cylinder is horizontally spaced on the upper surface of the rodless cylinder mounting seat. The stroke of the rodless cylinder must ensure that the second cylinder can retract to one side of the workbench 12 and does not interfere with the vertical up-and-down movement of the top cover follower device 8. The opening end of the second cylinder is set towards the core-combining pad 3. Positioning claws are horizontally spaced on the second cylinder and drive the two positioning claws to open and close, thereby longitudinally positioning the battery cell placed on the core-combining pad 3 and ensuring the alignment of the battery cell.

[0040] The present invention further includes a Z-axis adjustment device 17 on the inner top surface of the worktable 12 at a position relative to the top cover follower device 8, and the Z-axis adjustment device 17 and the forward and reverse lead screw device 16 are arranged without interference; for example Figure 1 , Figure 2 As shown, the adjustment end of the Z-axis adjustment device 17 extends vertically upward from the upper surface of the worktable 12 and is connected to the top cover follower device 8, driving the top cover follower device 8 to move vertically up and down, thereby ensuring the tab posture during the core-closing process through the top cover follower device 8.

[0041] The present invention provides a core-joining process for a core-joining device for butterfly welding of battery cells, comprising the following steps:

[0042] Step 1: First, place the incoming battery cells horizontally and vertically on the corresponding core pad 3, and then perform a horizontal positioning using the battery cell positioning block 2.

[0043] Step 2: Driven by the rodless cylinder, the second cylinder moves horizontally towards the center of the worktable 12 via the rodless cylinder mounting base. Then, driven by the second cylinder, the positioning jaws open to perform longitudinal positioning of the battery cell, thereby ensuring the alignment of the battery cell.

[0044] Step 3: Driven by the first cylinder, the battery cell is laterally positioned a second time by the first positioning block, and the corresponding battery cell is clamped and fixed.

[0045] Step 4: Driven by the rodless cylinder, the second cylinder is moved back to one side of the worktable 12 through the rodless cylinder mounting seat, ensuring that there is no interference with the vertical up and down movement of the top cover follower device 8.

[0046] Step 5: Driven by the forward and reverse screw device 16, the first moving plate 14 and the second moving plate 18 are controlled to move horizontally and longitudinally towards each other or away from each other according to the state of the battery cell when it is in the cell. This adjusts the relative position between the battery cells and ensures the relative position of the tabs.

[0047] Step 6: Driven by the first rotating shaft drive motor group 1 and the second rotating shaft drive motor group 7, the first rotating plate 9 and the second rotating plate 4 rotate 90° upward along the vertical direction to complete the core assembly; and during this process, the height of the top cover follower device 8 is adjusted by the Z-axis adjustment device 17 to ensure the attitude of the electrode tab.

[0048] The beneficial effects of this invention are:

[0049] (1) The present invention has a simple structure, which makes it easy for the battery cell to complete the core-combining action and also makes it easy for the battery cell to be removed from the top;

[0050] (2) The present invention can stably control the bending state of the tabs, thereby reducing the risk of battery short circuit;

[0051] (3) The present invention can stably control the alignment of the battery cell and the top cover follower device 8, thereby meeting the needs of the subsequent process.

[0052] (4) By setting the core-combining pad 3, the present invention can not only raise the height of the battery cell tab to be consistent with the axis of rotation, but also facilitate the mechanical claw to grasp the battery cell;

[0053] (5) The present invention uses the positive and negative lead screw device 16, the second slider and the second slide rail 15 to adjust the distance between the first moving plate 14 and the second moving plate 18, thereby adjusting the state of the battery cell when the cells are combined and ensuring the posture of the tabs.

[0054] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, all modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope of the present invention. The technical content for which protection is sought in the present invention has been fully described in the technical requirements.

Claims

1. A core-joining device for butterfly welding of battery cells, characterized in that: The device includes a worktable, a first rotating plate, a second rotating plate, a moving and flipping mechanism, a core-joining pad, and a top cover follower device. The first and second rotating plates are symmetrically positioned horizontally at intervals on the upper surface of the horizontally arranged worktable. The first and second rotating plates are adjusted by the moving and flipping mechanism moving synchronously in opposite directions horizontally, and then synchronously rotating in opposite directions vertically to complete the core joining. A core-joining pad, matching the battery cell, is also horizontally positioned at the middle of the upper surfaces of the first and second rotating plates, and the two core-joining pads are symmetrically positioned. A longitudinal positioning mechanism is also provided on the upper surface of the worktable between the first and second rotating plates to longitudinally position the battery cell placed on the core-joining pad. A transverse positioning mechanism is also provided on the upper surfaces of the first and second rotating plates to laterally position the battery cell placed on the core-joining pad before clamping and fixing it. A top cover follower device is also horizontally positioned on the upper surface of the worktable between the two core-joining pads. The top cover follower device moves vertically up and down and ensures the electrode tab posture during the core joining process. The moving and flipping mechanism includes a first moving plate and a second moving plate; a first moving plate matching the first rotating plate is horizontally spaced between the first rotating plate and the upper surface of the worktable. The length of the first moving plate is greater than the length of the first rotating plate, and its width is less than the width of the first rotating plate, ensuring that its side closest to the center of the worktable is vertically aligned with the corresponding side of the first rotating plate; a second moving plate matching the second rotating plate is horizontally spaced between the second rotating plate and the upper surface of the worktable. The length of the second moving plate is greater than the length of the second rotating plate, and its width is less than the width of the second rotating plate, ensuring that its side closest to the center of the worktable is vertically aligned with the corresponding side of the second rotating plate. The longitudinal positioning mechanism includes a second cylinder, a positioning gripper, a rodless cylinder, and a rodless cylinder mounting base. A rodless cylinder is also horizontally spaced between the first and second moving plates on the upper surface of the worktable. The rodless cylinder is powered by compressed air. The rodless cylinder mounting base is sleeved on the rodless cylinder and performs horizontal reciprocating motion on the upper surface of the worktable via the rodless cylinder, without interfering with the movements of the top cover follower device, the first moving plate, the second moving plate, the first rotating plate, and the second rotating plate. The upper surface of the cylinder mounting base is also horizontally provided with a second cylinder, and the stroke of the rodless cylinder must ensure that the second cylinder can be retracted to one side of the worktable and does not interfere with the vertical up and down movement of the top cover follower device; the opening end of the second cylinder is respectively set towards the core-fitting plate, and positioning claws are also horizontally provided on it at intervals, and the two positioning claws are driven to open and close to perform longitudinal positioning of the battery cell placed on the core-fitting plate, thereby ensuring the alignment of the battery cell, and by setting the core-fitting plate, the height of the battery cell tab is made to be consistent with the axis of rotation.

2. The core-joining device for butterfly welding of battery cells according to claim 1, characterized in that: The moving and flipping mechanism further includes a second slide rail, a second slider, and a forward and reverse lead screw device; the first moving plate and the second moving plate do not interfere with the vertical up and down movement of the top cover follow-up device and the longitudinal positioning movement of the longitudinal positioning mechanism. Furthermore, second slide rails are symmetrically arranged horizontally and longitudinally on the left and right sides of the upper surface of the worktable. Second sliders are also arranged at intervals on the left and right sides of the lower surfaces of the first and second moving plates relative to the positions of the second slide rails. Each second slider matches a corresponding second slide rail. The first and second moving plates are respectively connected via a first... Two sliders are horizontally and longitudinally slidably connected to two second slide rails; a positive and negative lead screw device is also horizontally and longitudinally provided on the inner top surface of the worktable between the two second slide rails, and the moving end of the positive and negative lead screw device extends out of the upper surface of the worktable. The lower surface of the first moving plate is connected to the forward moving end of the positive and negative lead screw device, and the lower surface of the second moving plate is connected to the reverse moving end of the positive and negative lead screw device. Thus, under the drive of the positive and negative lead screw device, the first moving plate and the second moving plate move horizontally and longitudinally towards each other or away from each other to adjust the longitudinal distance between the first moving plate and the second moving plate.

3. The core-joining device for butterfly welding of battery cells according to claim 2, characterized in that: It also includes a first rotary axis drive motor assembly, a first rotary driven seat assembly, a first connecting block, a second rotary axis drive motor assembly, a second connecting block, and a second rotary driven seat assembly; a first rotary driven seat assembly is also vertically arranged on the left edge of the upper surface of the first movable plate, and the rotating end of the first rotary driven seat assembly is connected to the corresponding side of the first rotary plate through the first connecting block; a first rotary axis drive motor assembly is also horizontally and longitudinally slidably arranged on the inner bottom surface of the worktable near the first rotary driven seat assembly, the sliding action of the first rotary axis drive motor assembly is synchronized with the horizontal and longitudinal movement of the first movable plate, and its output end is linked with the first rotary driven seat assembly, thus... The first rotary follower assembly drives the first rotating plate to rotate vertically. A second rotary follower assembly is also vertically arranged on the right edge of the upper surface of the second moving plate, and the rotating end of the second rotary follower assembly is connected to the corresponding side of the second rotating plate through a second connecting block. A second rotary shaft drive motor assembly is also horizontally and longitudinally slidably arranged on the inner bottom surface of the worktable near the second rotary follower assembly. The sliding action of the second rotary shaft drive motor assembly is synchronized with the horizontal and longitudinal movement of the second moving plate, and its output end is linked with the second rotary follower assembly, thereby driving the second rotary follower assembly to drive the second rotating plate to rotate vertically.

4. A core-joining device for butterfly welding of battery cells according to claim 3, characterized in that: It also includes rotational hard stops; two rotational hard stops are respectively provided at the front edge of the lower surface of the first rotating plate and at the rear edge of the lower surface of the second rotating plate, and the four rotational hard stops are respectively fixedly installed on the upper surface of the worktable, and do not interfere with the horizontal longitudinal movement of the corresponding first and second moving plates; the four rotational hard stops are all spaced between the two second slide rails, and their heights correspond to the distance between the first rotating plate and the upper surface of the worktable when in a horizontal state, thereby limiting the back-to-back flipping of the first and second rotating plates respectively.

5. A core-joining device for butterfly welding of battery cells according to claim 3, characterized in that: Both the first and second rotary shaft drive motor sets are composed of a motor and a right-angle reducer.

6. A core-joining device for butterfly welding of battery cells according to claim 4, characterized in that: Each of the aforementioned lateral positioning mechanisms includes a cell positioning block and a cell positioning mechanism. Four rectangular cell positioning blocks are respectively positioned at the middle of the upper surface of the first and second rotating plates. Each set of four adjacent cell positioning blocks is located at the four right angles of the corresponding core-combining pad. An arc-shaped groove matching the cell is embedded in the upper part of the side facing the core-combining pad, thereby performing a first lateral positioning of the cell placed on the corresponding core-combining pad. Cell positioning mechanisms are also respectively provided on the upper surface of the first and second rotating plates relative to the left and right sides of the corresponding core-combining pad. Each cell positioning mechanism is independently configured with respect to the corresponding cell positioning block. The fixed end of each cell positioning mechanism is fixedly connected to the upper surface of the corresponding first or second rotating plate, and its positioning end moves horizontally towards the corresponding core-combining pad, thereby performing a second lateral positioning of the cell placed on the corresponding core-combining pad and clamping and fixing the cell.

7. A core-joining device for butterfly welding of battery cells according to claim 6, characterized in that: Each of the aforementioned cell positioning mechanisms includes a first cylinder, a first slide rail, a first slider, and a first positioning block. On the upper surfaces of the first and second rotating plates, respectively, a first cylinder is provided on the left and right sides relative to the corresponding core-combining pad. Each first cylinder is fixedly disposed on the upper surface of the first or second rotating plate between two corresponding cell positioning blocks, and its extension and retraction ends move horizontally towards the corresponding core-combining pad, and are screwed to the corresponding horizontally longitudinally positioned first positioning block. The longitudinal width of each first positioning block matches the distance between the two corresponding cell positioning blocks, and each cell positioning block does not interfere with the horizontal lateral movement of the corresponding first positioning block. Each positioning block has an arc-shaped groove embedded on the upper side of its side facing the core pad, which matches the battery cell. Four rectangular first sliders are also provided on the lower surface of each first positioning block. Two horizontal first slide rails are also provided at intervals on the upper surfaces of the first and second rotating plates relative to the corresponding first positioning block positions. Each first slide rail is configured to operate independently of the corresponding first cylinder and the corresponding battery cell positioning block. Each first slide rail matches the corresponding first slider, and the distance between any two adjacent first slide rails corresponds to the distance between the corresponding two front and rear first sliders. Thus, the cooperation of the first sliders and first slide rails ensures the stability of the horizontal movement of the corresponding first positioning block.

8. A core-joining device for butterfly welding of battery cells according to claim 7, characterized in that: It also includes a Z-axis adjustment device; a Z-axis adjustment device is also provided on the inner top surface of the worktable at the position relative to the top cover follower device, and the Z-axis adjustment device and the positive and negative lead screw device are set without interference; the adjustment end of the Z-axis adjustment device extends vertically upward from the upper surface of the worktable and is connected to the top cover follower device, driving the top cover follower device to move vertically up and down, thereby ensuring the electrode posture through the top cover follower device during the core-closing process.

9. The core-joining process of a core-joining device for butterfly welding of battery cells according to claim 8, characterized in that... Includes the following steps: Step 1: First, place the incoming battery cells horizontally and vertically on the corresponding core-combining pads, and then perform a horizontal positioning using the battery cell positioning blocks; Step 2: Driven by the rodless cylinder, the second cylinder moves horizontally towards the center of the worktable via the rodless cylinder mounting base. Then, driven by the second cylinder, the positioning jaws open to perform longitudinal positioning of the battery cell, thereby ensuring the alignment of the battery cell. Step 3: Driven by the first cylinder, the battery cell is laterally positioned a second time by the first positioning block, and the corresponding battery cell is clamped and fixed. Step 4: Driven by the rodless cylinder, the second cylinder is moved to one side of the worktable via the rodless cylinder mounting seat, ensuring that it does not interfere with the vertical up and down movement of the top cover follower device; Step 5: Driven by the positive and negative lead screw device, the first moving plate and the second moving plate are controlled to move horizontally and longitudinally towards each other or away from each other according to the state of the battery cell when it is in the core, thereby adjusting the relative position between the battery cells and ensuring the relative position of the tabs. Step Six: Driven by the first and second rotary axis drive motors, the first and second rotary plates rotate 90° upwards along the vertical direction to complete the core assembly; during this process, the height of the top cover follower device is adjusted by the Z-axis adjustment device to ensure the attitude of the tabs.

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