A soft package lithium ion battery tab flattening device

Abstract

The utility model relates to lithium battery technical field, more specifically, relate to a kind of soft package lithium ion battery tab leveling device, including rack, leveling mechanism and feeding mechanism;Feeding mechanism is realized the automatic horizontal conveying of battery cell by the cooperation of the second linear drive of material plate, material plate is provided with placing groove, placing groove can place battery cell and realize the accurate positioning of the tab of battery cell, significantly reduce the positioning error caused by manual placement and improve the automation level.Leveling mechanism adopts pressure spring transmission pressure, in combination with the accurate control of the stroke of pressure plate to first linear drive, can realize the stable and flexible adjustment of tab leveling pressure, both avoid the tab excessive compaction caused by excessive pressure, also prevent the leveling insufficient caused by insufficient pressure, to ensure the consistency and reliability of tab leveling quality.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and more specifically, to a device for leveling the tabs of a soft-pack lithium-ion battery. Background Technology

[0002] The manufacturing of pouch lithium-ion battery cells mainly includes key processes such as electrode preparation, electrode cutting, winding or stacking, tab welding, cell packaging, and formation and capacity testing. Among these, tab welding is the core step in connecting the internal electrochemical system with the external circuitry. After welding, the weld joints commonly exhibit surface defects such as microscopic burrs, metal spatter, and localized deformation protrusions. These surface defects may puncture the separator during battery charge-discharge cycles, causing internal short circuits, and also impair the airtightness of the aluminum-plastic encapsulation film, leading to electrolyte leakage and accelerated battery performance degradation.

[0003] To address the aforementioned surface defects, existing processes typically employ pressure devices to level the tabs. However, several issues remain in the implementation: First, cell placement relies on manual operation, making it difficult to guarantee positioning accuracy and resulting in a low overall level of automation. Second, pressure control during leveling is not precise enough, easily leading to over-compaction or under-leveling of the tab surface, resulting in unstable flatness quality and hindering the overall yield and reliability of battery manufacturing. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a leveling device for the tabs of a soft-pack lithium-ion battery, aiming to provide a leveling device with high automation efficiency, accurate positioning, and uniform pressure.

[0005] A soft-pack lithium-ion battery tab leveling device according to an embodiment of the present invention includes: A frame; the frame is provided with a pressure plate and a first linear drive, the output end of the first linear drive is connected to the pressure plate, and the first linear drive can control the pressure plate to reciprocate along the vertical direction; A leveling mechanism, wherein the leveling mechanism is provided with a pressure head, the pressure head being connected to the pressure plate via a pressure spring; The feeding mechanism includes a material plate and a second linear drive. The material plate has a placement slot for placing battery cells. The material plate and the frame are slidably connected. The output end of the second linear drive is connected to the material plate, and the second linear drive can control the material plate to reciprocate in the horizontal direction.

[0006] According to some embodiments of the present invention, the frame includes a base plate and a top plate, a plurality of guide posts are provided between the base plate and the top plate, the pressure plate is slidably connected to the guide posts, the first linear drive is fixedly connected to the top plate, and the output end of the first linear drive passes through the top plate and is drively connected to the pressure plate.

[0007] According to some embodiments of the present invention, the pressure plate is provided with a linear bearing corresponding to the guide post, and the pressure plate is slidably connected to the guide post through the linear bearing.

[0008] According to some embodiments of the present invention, a connecting block is detachably connected to the pressure plate, and an installation groove is provided on the connecting block, with openings at both ends of the installation groove; a push head is provided at the output end of the first linear drive, and the push head is disposed in the installation groove.

[0009] According to some embodiments of the present invention, the leveling mechanism includes a mounting base, a reset shaft is provided on the mounting base, a guide hole is provided on the pressure head, a limit bolt is provided through the guide hole on the reset shaft, a pressure spring is sleeved on the reset shaft, one end of the pressure spring abuts against the mounting base, and the other end of the pressure spring abuts against the pressure head.

[0010] According to some embodiments of the present invention, the leveling mechanism includes a fastener assembly, and the mounting base has slots at both ends; the fastener assembly includes an adjusting knob and an adjusting bolt, and one end of the adjusting bolt passes through the slot, the pressure plate and the adjusting knob in a threaded connection.

[0011] According to some embodiments of the present invention, the mounting base is provided with a guide shaft, and the guide shaft and the pressure head are slidably connected.

[0012] According to some embodiments of the present invention, a sliding groove is provided on the substrate, and a slider is provided at the lower end of the material plate, wherein the slider and the sliding groove are slidably connected.

[0013] According to some embodiments of the present invention, one end of the material plate is provided with a positioning plane, which is used to place the electrode tab.

[0014] According to some embodiments of the present invention, the feeding mechanism includes a clamping assembly, the clamping assembly is provided with a U-shaped rod, and an elastic sleeve is sleeved on the U-shaped rod.

[0015] A tab leveling device for a soft-pack lithium-ion battery according to an embodiment of the present invention has at least the following beneficial effects: According to the present invention, the feeding mechanism achieves automatic horizontal conveying of battery cells through the cooperation of a material plate and a second linear drive. The material plate has a placement slot that can hold the battery cells and accurately position their tabs, significantly reducing positioning errors caused by manual placement and improving the level of automation. The leveling mechanism uses a pressure spring to transmit pressure, combined with precise control of the pressure plate stroke by the first linear drive, enabling stable and flexible adjustment of the tab leveling pressure. This avoids over-compacting of the tabs due to excessive pressure and insufficient leveling due to insufficient pressure, thus ensuring the consistency and reliability of the tab leveling quality. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is an enlarged schematic diagram of a partial structure of the present invention; Figure 3 This is a schematic diagram of the leveling mechanism of this utility model; Figure 4 This is a cross-sectional structural schematic diagram of the leveling mechanism of this utility model; Figure 5 This is a schematic diagram of the feeding mechanism of this utility model.

[0017] In the picture: 100-Frame, 110-Pressure plate, 120-First linear drive, 130-Base plate, 131-Slide groove, 140-Top plate, 150-Guide column, 160-Linear bearing, 170-Connecting block, 171-Mounting groove, 180-Push head; 200-Leveling mechanism, 210-Pressure head, 221-Guide hole, 220-Pressure spring, 230-Mounting base, 231-Reset shaft, 232-Limit bolt, 233-Slot, 234-Guide shaft, 240-Fastener assembly, 241-Adjusting knob, 242-Adjusting bolt; 300-Feeding mechanism, 310-Material plate, 311-Placement slot, 312-Slider, 313-Positioning plane, 320-Second linear drive, 330-Clamping assembly, 331-U-shaped rod, 332-Elastic sleeve; 400 - battery cell, 410 - electrode tab. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0019] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0021] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0022] Reference Figures 1 to 5As shown, this utility model discloses a flattening device for the tabs of a soft-pack lithium-ion battery. The device includes a frame 100, a flattening mechanism 200, and a feeding mechanism 300. The frame 100 is equipped with a pressure plate 110 and a first linear drive 120. The output end of the first linear drive 120 is connected to the pressure plate 110, and the first linear drive 120 can control the pressure plate 110 to reciprocate vertically. The flattening mechanism 200 is equipped with a pressure head 210. The pressure head 210 is connected to the pressure plate 110 via a pressure spring 220; the feeding mechanism 300 is provided with a material plate 310 and a second linear drive 320; the material plate 310 is provided with a placement groove 311 for placing the battery cell 400; the material plate 310 and the frame 100 are slidably connected, and the output end of the second linear drive 320 is connected to the material plate 310, and the second linear drive 320 can control the material plate 310 to reciprocate in the horizontal direction. Specifically, during operation, firstly, the second linear drive 320 in the feeding mechanism 300 pushes the material plate 310 to move horizontally, accurately delivering the battery cell 400 placed in the placement slot 311 within the material plate 310 to the designated position. The size of the placement slot 311 matches the size of the battery cell 400, enabling accurate positioning of the battery cell 400. Subsequently, the first linear drive 120 on the frame 100 controls the pressure plate 110 to move vertically downward, thereby transmitting pressure to the pressure head 210 of the leveling mechanism 200 via the pressure spring 220. The pressure head 210 then applies controllable pressure to the positioned battery cell 400 tab 410. Through this structural design, the pressure spring 220 buffers and evens out the leveling force applied by the pressure head 210, helping to adapt to minor unevenness on the surface of the tab 410 and improving the uniformity of pressure distribution. After leveling, the pressure plate 110 rises and resets, and the material plate 310 moves horizontally out for the next feeding cycle. Through this structural design, the feeding mechanism 300, in cooperation with the material plate 310 and the second linear drive 320, achieves automatic horizontal conveying of the battery cell 400. The material plate 310 is equipped with a placement slot 311, which can place the battery cell 400 and accurately position its tabs 410, significantly reducing positioning errors caused by manual placement and improving automation. The leveling mechanism 200 uses a pressure spring 220 to transmit pressure, combined with the precise control of the pressure plate 110's stroke by the first linear drive 120, enabling stable and flexible adjustment of the tab leveling pressure. This avoids over-compacting of the tabs 410 due to excessive pressure, and also prevents insufficient leveling due to insufficient pressure, thus ensuring the consistency and reliability of the tab leveling quality.

[0023] In some embodiments of this utility model, the frame 100 includes a base plate 130 and a top plate 140. A plurality of guide posts 150 are disposed between the base plate 130 and the top plate 140. A pressure plate 110 is slidably connected to the guide posts 150. A first linear drive 120 is fixedly connected to the top plate 140, and the output end of the first linear drive 120 passes through the top plate 140 and is drively connected to the pressure plate 110. During operation, the first linear drive 120 of the feeding mechanism 300 first pushes the material plate 310 horizontally, delivering the battery cell 400 positioned in the placement slot 311 to the leveling station. Subsequently, the first linear drive 120 on the frame 100 is activated, and its output end pushes the pressure plate 110 to slide steadily down along the guide posts 150. The pressure plate 110 transmits force to the pressure head 210 through a pressure spring 220, leveling the precisely positioned electrode tab 410. After leveling, the pressure plate 110 rises back along the guide posts 150, and the material plate 310 moves out, completing the cycle. The guide column 150 provides precise guidance for the pressure plate 110, ensuring no deviation during the leveling process; the first linear drive 120 is stably fixed by the top plate 140, making the output force transmission more reliable.

[0024] In some embodiments of this utility model, a linear bearing 160 is provided on the pressure plate 110 corresponding to the guide post 150, and the pressure plate 110 and the guide post 150 are slidably connected through the linear bearing 160. In this embodiment, by providing the linear bearing 160, the sliding resistance of the pressure plate 110 in the vertical direction can be reduced, thereby improving the stability of applying pressure to the tab 410.

[0025] In some embodiments of this utility model, a connecting block 170 is detachably connected to the pressure plate 110, and a mounting groove 171 is provided on the connecting block 170, with openings at both ends of the mounting groove 171; a push head 180 is provided at the output end of the first linear drive 120, and the push head 180 is disposed in the mounting groove 171. Specifically, in this embodiment, the pressure plate 110 and the connecting block 170 are detachably connected, specifically, by means of bolt connection; the mounting groove 171 is provided on the connecting block 170, with openings at both ends of the mounting groove 171. When disassembling or assembling this device or performing routine maintenance, the locking between the connecting block 170 and the pressure plate 110 is first released, and then the push head 180 can enter the center position of the connecting block 170 through the openings on both sides of the mounting groove 171. Through the design of this structure, the stability of the pressure applied by the first linear drive 120 and the convenience of equipment maintenance are improved.

[0026] In some embodiments of this utility model, the leveling mechanism 200 includes a mounting base 230, a reset shaft 231 is provided on the mounting base 230, a guide hole 221 is provided on the pressure head 210, a limit bolt 232 is provided through the guide hole 221 on the reset shaft 231, and a pressure spring 220 is sleeved on the reset shaft 231, with one end of the pressure spring 220 abutting against the mounting base 230 and the other end abutting against the pressure head 210. Through this structural design, on the one hand, through the cooperation of the reset shaft 231 and the pressure spring 220, the pressure head 210 can apply flexible and stable pressure to the tab 410, effectively avoiding rigid impact, preventing over-compactment of the tab 410 and ensuring leveling uniformity. On the other hand, the structural design of the limit bolt 232 and the detachable connecting block 170 makes the stroke of key components adjustable and maintenance convenient, improving the service life and maintainability of the equipment. The overall structure significantly improves the stability of the equipment while ensuring leveling accuracy.

[0027] In some embodiments of this utility model, the leveling mechanism 200 includes a fastener assembly 240, and the mounting base 230 has slots 233 at both ends. The fastener assembly 240 includes an adjusting knob 241 and an adjusting bolt 242, one end of which passes through the slot 233, the pressure plate 110, and the adjusting knob 241 and is threadedly connected. Specifically, in this embodiment, the fastener assembly 240 enables a stable connection between the mounting base 230 and the pressure plate 110. During equipment debugging, the adjusting bolt 242, in conjunction with the slot 233 on the mounting base 230, allows the mounting base 230 to be adjusted horizontally on the pressure plate 110. Combined with the synergistic effect of the reset shaft 231 and the pressure spring 220, the contact position between the pressure head 210 and the tab 410 and the leveling pressure can be controlled more precisely, effectively improving process adaptability.

[0028] In some embodiments of this utility model, a guide shaft 234 is provided on the mounting base 230, and the guide shaft 234 and the pressure head 210 are slidably connected. Specifically, in this embodiment, by providing the guide shaft 234, the fitting accuracy between the mounting base 230 and the pressure head 210 can be improved.

[0029] In some embodiments of this utility model, a groove 131 is provided on the substrate 130, and a slider 312 is provided at the lower end of the material plate 310. The slider 312 and the groove 131 are slidably connected. Specifically, in this embodiment, the movement direction of the material plate 310 can be limited by providing the groove 131 and the slider 312.

[0030] In some embodiments of this utility model, a positioning plane 313 is provided at one end of the material plate 310, and the positioning plane 313 is used to place the tab 410. Specifically, in this embodiment, when processing the material plate 310, only the area of ​​the positioning plane 313 needs to be processed with high precision to meet the horizontal accuracy of the area where the tab 410 is placed, thereby reducing processing costs.

[0031] In some embodiments of this utility model, the feeding mechanism 300 includes a clamping component 330, which is provided with a U-shaped rod 331, and an elastic sleeve 332 is fitted onto the U-shaped rod 331. Specifically, in this embodiment, by providing the clamping component 330, the battery cell 400 can be quickly placed and removed, and the stability of the battery cell 400 can be improved when clamping it.

[0032] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A device for leveling the tabs of a soft-pack lithium-ion battery, characterized in that, include: A frame (100); the frame (100) is provided with a pressure plate (110) and a first linear drive (120), the output end of the first linear drive (120) is connected to the pressure plate (110), and the first linear drive (120) can control the pressure plate (110) to reciprocate in the vertical direction; A leveling mechanism (200) is provided with a pressure head (210), which is connected to the pressure plate (110) via a pressure spring (220); The feeding mechanism (300) is provided with a material plate (310) and a second linear drive (320); the material plate (310) is provided with a placement slot (311) for placing battery cells (400); the material plate (310) and the frame (100) are slidably connected, and the output end of the second linear drive (320) is connected to the material plate (310), and the second linear drive (320) can control the material plate (310) to reciprocate in the horizontal direction.

2. The soft-pack lithium-ion battery tab leveling device according to claim 1, characterized in that, The frame (100) includes a base plate (130) and a top plate (140). A plurality of guide posts (150) are provided between the base plate (130) and the top plate (140). The pressure plate (110) and the guide posts (150) are slidably connected. The first linear drive (120) is fixedly connected to the top plate (140). The output end of the first linear drive (120) is driven through the top plate (140) and the pressure plate (110).

3. The soft-pack lithium-ion battery tab leveling device according to claim 2, characterized in that, The pressure plate (110) is provided with a linear bearing (160) corresponding to the guide post (150), and the pressure plate (110) and the guide post (150) are slidably connected through the linear bearing (160).

4. The soft-pack lithium-ion battery tab leveling device according to claim 2, characterized in that, A connecting block (170) is detachably connected to the pressure plate (110), and a mounting groove (171) is provided on the connecting block (170). The mounting groove (171) has openings at both ends. A push head (180) is provided at the output end of the first linear drive (120), and the push head (180) is located in the mounting groove (171).

5. The soft-pack lithium-ion battery tab leveling device according to claim 1, characterized in that, The leveling mechanism (200) includes a mounting base (230), a reset shaft (231) is provided on the mounting base (230), a guide hole (221) is provided on the pressure head (210), a limit bolt (232) is provided through the guide hole (221) on the reset shaft (231), and a pressure spring (220) is sleeved on the reset shaft (231), one end of the pressure spring (220) abuts against the mounting base (230), and the other end of the pressure spring (220) abuts against the pressure head (210).

6. The soft-pack lithium-ion battery tab leveling device according to claim 5, characterized in that, The leveling mechanism (200) includes a fastener assembly (240), and the mounting base (230) has slots (233) at both ends; the fastener assembly (240) includes an adjustment knob (241) and an adjustment bolt (242), one end of the adjustment bolt (242) being threaded through the slot (233), the pressure plate (110) and the adjustment knob (241).

7. The soft-pack lithium-ion battery tab leveling device according to claim 5, characterized in that, The mounting base (230) is provided with a guide shaft (234), and the guide shaft (234) and the pressure head (210) are slidably connected.

8. The soft-pack lithium-ion battery tab leveling device according to claim 2, characterized in that, The substrate (130) is provided with a groove (131), and the lower end of the material plate (310) is provided with a slider (312), and the slider (312) and the groove (131) are slidably connected.

9. The soft-pack lithium-ion battery tab leveling device according to claim 1, characterized in that, One end of the material plate (310) is provided with a positioning plane (313), which is used to place the tab (410).

10. The soft-pack lithium-ion battery tab leveling device according to claim 9, characterized in that, The feeding mechanism (300) includes a clamping assembly (330), the clamping assembly (330) is provided with a U-shaped rod (331), and an elastic sleeve (332) is sleeved on the U-shaped rod (331).

Images