Parallel stacking type lithium battery module pre-pressing system for lithium battery pack production line

Abstract

This invention discloses a parallel stacked lithium battery module pre-compression system for lithium battery pack production lines, relating to the field of lithium battery production. Specifically, it includes a pre-compression fixture and a moving fixture for displacing the battery. The pre-compression fixture includes a pressing housing, with fixed cylinders inserted on both the front and rear sides of the housing. The extended ends of the fixed cylinders are equipped with side limiting plates that restrict the side movement of the battery, and the side limiting plates have a U-shaped cross-section. A positioning cylinder is located on one side of the pressing housing, with a positioning plate at its extended end. A pressing cylinder is located on the other side of the housing, with a pressing plate at its extended end. During the initial placement of the batteries, this invention utilizes the rotational thrust of a horizontal long roller to ensure longitudinal flatness. During the pre-compression stage, the rolling limitation of a vertical short roller reduces friction between the battery and the side limiting plates, providing a more precise and efficient limiting method to meet the needs of different stages of battery assembly.

Description

Technical Field

[0001] This invention relates to the field of lithium battery production technology, and more specifically, to a parallel stacked lithium battery module pre-compression system for lithium battery pack production lines. Background Technology

[0002] In the lithium battery pack production line, individual batteries need to be grouped together and then connected into modules through an intermediate layer composed of PC boards and 3M adhesive. During this module assembly process, multiple batteries are manually arranged and glued together one by one, resulting in a high degree of randomness in alignment and often leading to poor flatness of the bottom and side panels.

[0003] According to the patent document with announcement number CN213905429U, a lithium battery module pre-stacking device is disclosed. The device uses a variety of devices to ensure the flatness of the bottom and sides of the battery during stacking, and uses springs to connect rollers to avoid friction damage to the terminals. The device can be quickly disassembled and reused.

[0004] However, by controlling the rotation of the roller to squeeze and lock the battery side, the roller remains horizontal and squeezes the battery side during the process of moving the moving pressure plate and the battery towards the fixed plate and finally squeezing each other to form a pre-stacked module. There is lateral friction between the roller surface and the battery, which hinders the smooth movement of the battery and poses a risk of scratching the battery surface. It is impossible to control and reduce friction and reduce the risk of surface damage to the battery during the assembly process by changing the physical position of the limiting mechanism, while improving assembly efficiency. Therefore, a solution is provided. Summary of the Invention

[0005] To overcome the aforementioned deficiencies of the prior art, the present invention provides a parallel stacked lithium battery module pre-compression system for lithium battery pack production lines.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a pre-compression system for parallel stacked lithium battery modules in a lithium battery pack production line, comprising a pre-compression fixture and a moving fixture for displacing the module. The pre-compression fixture includes a compression housing, with fixed cylinders inserted on both the front and rear sides of the compression housing. The extended ends of the fixed cylinders are provided with side limiting plates for limiting the side of the battery, and the cross-section of the side limiting plates is U-shaped. A positioning cylinder is provided on one side of the compression housing, with a positioning plate provided on the extended end of the positioning cylinder. A compression cylinder is provided on the other side of the compression housing, with a compression plate provided on the extended end of the compression cylinder.

[0007] The side limiting plate is provided with a friction conversion component inside; the conversion component includes a T-shaped groove formed on the upper and lower outer walls of the side limiting plate, a T-shaped long plate slidably disposed inside the T-shaped groove, two sets of T-shaped long plates are arranged opposite to each other, and a conversion plate is fixedly provided on the opposite side wall of the two sets of T-shaped long plates, a rack is fixedly provided on the opposite side wall of the two sets of conversion plates, and a gear is provided between the two sets of racks and meshing with it.

[0008] Furthermore, the two sets of conversion plates are staggered, and the conversion plates have positioning grooves inside. Multiple sets of cylindrical grooves are opened on the side walls of the positioning grooves. Limiting columns are slidably arranged inside the cylindrical grooves, and the ends of the multiple sets of limiting columns are connected to a positioning movable plate that slides with the positioning groove.

[0009] Furthermore, one of the upper positioning movable plates is rotatably mounted on the side wall of the battery with a horizontal long roller. A connecting shaft is provided in the middle of the horizontal long roller, and the connecting shaft is rotatably engaged with the side wall of the positioning movable plate. A motor connected to the positioning movable plate is provided at the end of the connecting shaft. A thrust spring is sleeved on the outer wall of the limiting post inside the positioning groove.

[0010] Furthermore, another set of the positioning movable plates located below is fixed with a U-shaped long plate on the side wall facing the battery, and the U-shaped long plate has multiple sets of vertical short rollers arranged in an internal array to rotate with the U-shaped long plate.

[0011] Furthermore, multiple sets of cylindrical grooves are evenly distributed on the positioning groove.

[0012] Furthermore, a drive shaft is provided in the middle of the gear, and the end of the drive shaft is rotatably connected to the press housing, and a motor for driving it is provided at the end of the drive shaft.

[0013] Furthermore, the movable tooling includes a threaded rod threadedly connected to the lower part of the press housing, a movable seat slidably provided on the outer side of the press housing, one end of the threaded rod being rotatably connected to the movable seat, and the other end of the threaded rod being fixedly provided with a motor three, which is fixedly connected to the movable seat.

[0014] Furthermore, two sets of connecting shafts are symmetrically and rotatably installed on the lower part of the pressing machine housing, and limiting rollers are rotatably provided on both sides of the connecting shafts. A slide rail that slides and cooperates with the limiting rollers is provided on the upper part of the moving seat.

[0015] The technical effects and advantages of this invention are as follows:

[0016] This invention constructs an area for battery placement by controlling the coordinated extension of a fixing cylinder and a clamping cylinder. When the side limiting plate fixes the side of the battery, the horizontal long roller forms a pressing contact with the side wall of the battery. Then, by two sets of motors rotating in opposite directions, the horizontal long roller applies a downward "rotational thrust" to the side wall of the battery, effectively ensuring the flatness of the battery in the longitudinal direction, while avoiding damage to the top electrode post of the battery. This provides high-precision positioning and reliable flatness guarantee for lithium battery assembly.

[0017] This invention controls the gears to rotate in reverse. The upper rack moves the horizontal long roller inside the side limiting plate, and the lower rack moves the vertical short roller outside the side limiting plate. When the subsequent pressing cylinder drives the pressing plate to perform pre-pressing operation on multiple battery groups, the vertical short roller rolls and limits the outer wall of the battery, reducing the friction between the side limiting plate and the battery. This method of first limiting the placement of the horizontal long roller and then limiting the movement of the vertical short roller makes the multiple battery groups move more smoothly during the pressing process, greatly improving the smoothness and efficiency of lithium battery assembly. At the same time, the rolling friction effectively reduces the risk of damage during battery assembly.

[0018] This invention employs a two-stage strategy: first, horizontal long rollers limit the placement of the battery, and then vertical short rollers limit its movement. During the initial placement of the battery, the rotational thrust of the horizontal long rollers ensures the battery is longitudinally flat. In the pre-compression stage, the rolling of the vertical short rollers reduces friction between the battery and the side limiting plates. This provides a more precise and efficient limiting method to meet the needs of different stages of battery assembly, effectively solving the problems of poor battery movement and surface scratches caused by continuous compression. Attached Figure Description

[0019] Figure 1 This is a perspective view of the overall structure of the present invention.

[0020] Figure 2 This is a side view of the internal structure of the overall structure in this invention.

[0021] Figure 3 This is a front view of the internal structure of the side limiting plate in this invention.

[0022] Figure 4 This is a three-dimensional view of the pre-compression fixture in this invention.

[0023] Figure 5 This is a magnified three-dimensional representation of the structure of region A in this invention.

[0024] Figure 6 This is a cross-sectional perspective view of the pre-compression fixture in this invention.

[0025] The attached figures are labeled as follows:

[0026] 1. Moving fixture; 11. Limiting roller; 12. Threaded rod; 13. Connecting shaft; 14. Moving seat; 2. Pre-clamping fixture; 21. Clamping housing; 22. Positioning plate; 23. Side limiting plate; 24. Clamping cylinder; 25. Clamping plate; 3. Conversion assembly; 31. T-slot; 32. T-shaped long plate; 33. Conversion plate; 34. Rack; 35. Gear; 36. Columnar groove; 37. Positioning movable plate; 38. Limiting column; 39. Thrust spring; 310. Horizontal long roller; 311. Vertical short roller; 312. Positioning groove. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1: Please refer to Figures 1-6 As shown, the friction between the roller surface and the battery hinders the smooth movement of the battery and poses a risk of scratching the battery surface. The following solutions can be used to address this issue.

[0029] In this embodiment, a parallel stacked lithium battery module pre-compression system for a lithium battery pack production line includes a pre-compression fixture 2 and a moving fixture 1 for displacing the pre-compression fixture 2. The pre-compression fixture 2 includes a compression housing 21. Fixed cylinders are inserted on both the front and rear sides of the compression housing 21. The extended end of the fixed cylinder is provided with a side limiting plate 23 for limiting the side of the battery. The cross-section of the side limiting plate 23 is U-shaped. A positioning cylinder is provided on one side of the compression housing 21. A positioning plate 22 is provided on the extended end of the positioning cylinder. A compression cylinder 24 is provided on the other side of the compression housing 21. A compression plate 25 for pressing the battery is provided on the extended end of the compression cylinder 24.

[0030] As can be seen from the above: when the extension end of the fixed cylinder is extended, the two sets of limiting plates move synchronously through the extension of the fixed cylinder, while the positioning cylinder remains unchanged, that is, the position of the positioning plate 22 remains unchanged. Then, the extension end of the pressing cylinder 24 is extended to drive the pressing plate 25 to move between the two limiting plates. At this time, a placement area is formed above the pressing housing 21. The battery is transferred into the placement area by the robotic arm. Then, the extension end of the fixed cylinder is extended to move the side limiting plate 23 to one side of the battery, thus completing the limitation of the battery side.

[0031] The following points require explanation:

[0032] When the battery is transferred to the placement area by the robotic arm, there is a gap between the battery sidewall and the side limiting plate 23, which is generally between 0.5-1CM, to ensure smooth placement.

[0033] The end sidewalls of both sets of side limiting plates 23 are slidably fitted with the positioning plate 22, and the width of the pressing plate 25 is less than the vertical distance between the two side limiting plates 23, ensuring that the pressing plate 25 moves smoothly between the two side limiting plates 23.

[0034] A rubber pad is provided on the outer wall of the clamping plate 25 that contacts the battery to prevent damage to the outer wall of the battery;

[0035] The side limiting plate 23 is provided with a friction conversion component 3. The conversion component 3 includes a T-shaped groove 31 opened on the upper and lower outer walls of the side limiting plate 23. A T-shaped long plate 32 is slidably arranged inside the T-shaped groove 31. Two sets of T-shaped long plates 32 are arranged opposite to each other, and a conversion plate 33 is fixedly provided on the opposite side walls of the two sets of T-shaped long plates 32. A rack 34 is fixedly provided on the opposite side walls of the two sets of conversion plates 33. A gear 35 is provided between the two sets of racks 34 and meshes with them. A drive shaft is provided in the middle of the gear 35.

[0036] Two sets of conversion plates 33 are staggered. The conversion plates 33 have positioning grooves 312 inside. Multiple sets of cylindrical grooves 36 are opened on the side wall of the positioning grooves 312. The cylindrical grooves 36 are evenly distributed on the positioning grooves 312. Limiting posts 38 are slidably installed inside the cylindrical grooves 36. The ends of the multiple sets of limiting posts 38 are connected to positioning movable plates 37 that slide with the positioning grooves 312. One set of positioning movable plates 37 located at the top has a horizontal long roller 310 rotatably installed on the side wall of the battery. A connecting shaft 13 is provided in the middle of the horizontal long roller 310, and the connecting shaft 13 is rotatably engaged with the side wall of the positioning movable plate 37. The end of the connecting shaft 13 is provided with a motor 2 that is fixedly connected to the positioning movable plate 37. A thrust spring 39 is sleeved on the outer wall of the limiting post 38 inside the positioning groove 312.

[0037] Another set of positioning movable plates 37 located below is fixed with a U-shaped long plate on the side wall facing the battery. The U-shaped long plate has multiple sets of vertical short rollers 311 arranged inside the array to rotate with the U-shaped long plate.

[0038] The end of the drive shaft is rotatably connected to the press housing 21, and the end of the drive shaft is provided with a motor for driving it.

[0039] As can be seen from the above, when the side limiting plate 23 fixes the battery, the horizontal long roller 310 provides a squeezing force to the side wall of the battery. The side wall of the battery and the horizontal long roller 310 are in a "pressing contact state". That is, the upper positioning movable plate 37 moves into the upper positioning groove 312, and the upper limiting post 38 moves into the upper cylindrical groove 36. The upper thrust spring 39 is in a squeezed state. The two sets of motors are controlled to rotate in opposite directions. The horizontal long roller 310 rotates to apply a downward "rotational thrust" to the side wall of the battery, ensuring the flatness of the battery in the longitudinal direction. And by adjusting the "rotational thrust", damage to the electrode post at the top of the battery is avoided.

[0040] Subsequently, the control motor drives the drive shaft to rotate, the gear 35 rotates in the opposite direction, driving the upper rack 34 to move away from the battery, moving the horizontal long roller 310 into the side limit plate 23. At the same time, the lower rack 34 moves towards the battery, moving the vertical short roller 311 out of the side limit plate 23.

[0041] Then, by extending the extension end of the pressing cylinder 24, the pressing plate 25 moves to one side of the battery to complete the pre-pressing operation on multiple sets of batteries. During this process, the vertical short roller 311 rolls and limits the outer wall of the battery, reducing the friction between the side limiting plate 23 and the battery.

[0042] First, the placement of the battery is limited by the horizontal long roller 310, and then the movement of the battery is limited by the vertical short roller 311. This makes the pushing of multiple battery groups smoother, reduces friction, improves the smoothness and efficiency of the lithium battery assembly process, and the rolling friction reduces the risk of damage during battery assembly.

[0043] It should be noted that the vertical short roller 311 is 0.3-0.5mm long outside the side limiting plate 23 to avoid applying excessive elastic thrust to the outer wall of the battery and damaging the outer wall of the battery.

[0044] Example 2: Please refer to Figure 1-2 As shown, supplementary explanations are provided based on Example 1;

[0045] The movable tooling 1 includes a threaded rod 12 threadedly connected to the lower part of the press housing 21. A movable seat 14 is slidably provided on the outer side of the press housing 21. One end of the threaded rod 12 is rotatably connected to the movable seat 14. The other end of the threaded rod 12 is fixedly provided with a motor 3, and the motor 3 is fixedly connected to the movable seat 14.

[0046] Two sets of connecting shafts 13 are symmetrically and rotatably installed on the lower part of the pressing machine housing 21. Limiting rollers 11 are rotatably provided on both sides of the connecting shafts 13. A slide rail that slides with the limiting rollers 11 is provided on the upper part of the moving seat 14.

[0047] By controlling the operation of motor three, the threaded rod 12 is driven to rotate. Since the threaded rod 12 is threadedly connected to the lower part of the moving seat 14, and the moving seat 14 limits the outer wall of the pressing machine housing 21, the pressing machine housing 21 is moved horizontally inside the moving seat 14, moving the pressing machine housing 21 from one side of the moving seat 14 to the other side, that is, from the pre-pressing station to the binding station.

[0048] In this invention, as can be seen from Embodiment 1 and Embodiment 2:

[0049] By controlling the coordinated extension of the fixing cylinder and the clamping cylinder 24 to construct the battery placement area, and utilizing the pressing contact of the horizontal long roller 310 when the side limiting plate 23 fixes the battery and the "rotational thrust" generated by the two sets of motors rotating in opposite directions, the longitudinal flatness of the battery is ensured and damage to the electrode posts is avoided, providing high-precision positioning and flatness guarantee.

[0050] Simultaneously, the gear 35 is controlled to rotate in the opposite direction to adjust its position, so that the vertical short roller 311 limits the rolling of the battery during pre-compression, reducing friction. By limiting the horizontal roller first and then the vertical roller, the assembly smoothness and efficiency are improved, and the risk of battery assembly damage is reduced. This mechanism reduces friction by changing the physical position rather than simply controlling the force, significantly reducing the risk of surface damage to the battery during the assembly process, while improving assembly efficiency.

[0051] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A parallel stacked lithium battery module pre-compression system for a lithium battery pack production line, comprising a pre-compression fixture (2) and a moving fixture (1) for displacing the pre-compression fixture, characterized in that, The pre-clamping fixture (2) includes a clamping housing (21). Fixed cylinders are inserted on both the front and rear sides of the clamping housing (21). The extended end of the fixed cylinder is provided with a side limiting plate (23) for limiting the side of the battery. The cross-section of the side limiting plate (23) is U-shaped. A positioning cylinder is provided on one side of the clamping housing (21). A positioning plate (22) is provided on the extended end of the positioning cylinder. A clamping cylinder (24) is provided on the other side of the clamping housing (21). A clamping plate (25) is provided on the extended end of the clamping cylinder (24). The side limiting plate (23) is provided with a conversion component (3) for converting friction force; the conversion component (3) includes a T-shaped groove (31) opened on the upper and lower outer walls of the side limiting plate (23), a T-shaped long plate (32) is slidably arranged inside the T-shaped groove (31), two sets of T-shaped long plates (32) are arranged opposite to each other, and a conversion plate (33) is fixedly provided on the opposite side walls of the two sets of T-shaped long plates (32), and a rack (34) is fixedly provided on the opposite side walls of the two sets of conversion plates (33), and a gear (35) is provided between the two sets of racks (34) and meshes with it. The two sets of conversion plates (33) are staggered. The conversion plate (33) has a positioning groove (312) inside. The side wall of the positioning groove (312) has multiple sets of cylindrical grooves (36). The cylindrical groove (36) has a limiting post (38) slidingly installed inside. The ends of the multiple sets of limiting posts (38) are connected to a positioning movable plate (37) that slides with the positioning groove (312). One of the upper positioning movable plates (37) is rotatably mounted on the side wall of the battery with a horizontal long roller (310). A connecting shaft (13) is provided in the middle of the horizontal long roller (310), and the connecting shaft (13) is rotatably engaged with the side wall of the positioning movable plate (37). A motor II connected to the positioning movable plate (37) is provided at the end of the connecting shaft (13). A thrust spring (39) is sleeved on the outer wall of the positioning groove (312) inside the limiting post (38). Another set of positioning movable plates (37) located below are fixed with a U-shaped long plate on the side wall facing the battery. The U-shaped long plate has multiple sets of vertical short rollers (311) arranged in an internal array to rotate with the U-shaped long plate. The gear (35) has a drive shaft in the middle, the end of the drive shaft is rotatably connected to the press housing (21), and the end of the drive shaft is provided with a motor for driving it.

2. The parallel stacked lithium battery module pre-compression system for lithium battery pack production lines according to claim 1, characterized in that: Multiple sets of cylindrical grooves (36) are evenly distributed on the positioning groove (312).

3. The parallel stacked lithium battery module pre-compression system for lithium battery pack production lines according to claim 1, characterized in that: The movable tooling (1) includes a threaded rod (12) threadedly connected to the bottom of the press housing (21). A movable seat (14) is slidably provided on the outer side of the press housing (21). One end of the threaded rod (12) is rotatably connected to the movable seat (14). The other end of the threaded rod (12) is fixedly provided with a motor three, and the motor three is fixedly connected to the movable seat (14).

4. The parallel stacked lithium battery module pre-compression system for lithium battery pack production lines according to claim 3, characterized in that: Two sets of connecting shafts (13) are symmetrically and rotatably installed below the pressing machine housing (21). Limiting rollers (11) are rotatably provided on both sides of the connecting shafts (13). A slide rail that slides and cooperates with the limiting rollers (11) is provided above the moving seat (14).

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