Lithium battery multi-station liquid injection equipment

Abstract

The invention relates to the technical field of battery liquid injection, in particular to lithium battery multi-station liquid injection equipment which comprises a liquid injection platform, the liquid injection platform is provided with a liquid injection mechanism and a cleaning mechanism for wiping battery tabs after liquid injection, and a bottom conveying mechanism for conveying batteries forwards is arranged below a liquid injection portal frame. The cleaning mechanism comprises a cleaning portal frame arranged behind the liquid injection portal frame, a linear driving part transversely perpendicular to the moving direction of the battery pack is installed on the cleaning portal frame, a cleaning driving plate is installed at the driving end of the linear driving part, and a wiping module is installed on the cleaning driving plate; after liquid injection is completed, a lifting cleaning plate of the cleaning mechanism descends to enable a cleaning belt to make contact with a battery, then a friction block rotationally drives the cleaning belt to make friction contact with a tab on the top face of a battery pack, and residual electrolyte on the surface of the tab after liquid injection can be more efficiently removed; the device can adapt to battery packs with different numbers of tabs and different heights, can meet the production requirements of batteries of multiple models, improves the universality of equipment, and reduces the production cost.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle battery liquid injection technology, and in particular to a multi-station liquid injection device for lithium batteries. Background Technology

[0002] With increasing attention to the environment, new energy vehicles have developed rapidly. As the core power component of new energy vehicles, the development of power batteries will inevitably affect the progress of new energy vehicles. Currently, there are many types of batteries, such as completely sealed ones, ones with safety valves, ones with multiple filling holes, and ones with both safety valves and filling holes. In existing technologies, the positive terminal, negative terminal, and filling hole of the battery are usually located at the top of the battery, and the liquid is filled from the top of the battery downwards.

[0003] Most existing electrolyte injection equipment only has a liquid passage hole in the injection cylinder, which easily traps air and forms bubbles during electrolyte injection. Residual bubbles directly lead to battery cell capacity decay, shortened cycle life, and even the risk of internal short circuits. Furthermore, it results in large variations in the electrolyte injection volume of individual cells in multi-cell battery packs, leading to poor overall performance consistency and failing to meet the high reliability requirements of new energy vehicle batteries. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-station liquid injection device for lithium batteries, addressing the shortcomings of existing technologies.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: A multi-station liquid injection device for lithium batteries includes a liquid injection platform. The liquid injection platform is equipped with a liquid injection mechanism and a cleaning mechanism for wiping the battery tabs after liquid injection. The liquid injection mechanism includes a longitudinally arranged liquid injection gantry. The liquid injection gantry is equipped with a longitudinally arranged liquid injection drive plate. The liquid injection drive plate is equipped with multiple liquid injection cylinders. The bottom of the liquid injection cylinder is provided with a liquid injection nozzle that cooperates with the battery. The top of the liquid injection cylinder is formed with a liquid passage hole and a vent hole. Below the liquid injection gantry is a bottom conveying mechanism for forward transport of batteries. The bottom conveying mechanism includes a bottom linear module arranged along the length of the liquid injection platform. A movable seat is installed at the drive end of the bottom linear module. A bottom support frame is installed on the movable seat. A bottom lifting cylinder is installed on the bottom support frame. A lifting plate is installed at the drive end of the bottom lifting cylinder. A surrounding frame for positioning the battery pack is installed on the top of the lifting plate. The cleaning mechanism includes a cleaning gantry located behind the liquid injection gantry. The cleaning gantry is equipped with a linear drive unit that is horizontally perpendicular to the direction of movement of the battery pack. A cleaning drive plate is installed at the drive end of the linear drive unit. A wiping module is installed on the cleaning drive plate. The wiping module includes a lifting cleaning plate that can move up and down. The lifting cleaning plate is equipped with a cleaning belt that can be driven. Multiple friction blocks are installed at the bottom of the lifting cleaning plate to drive the cleaning belt to abut against the top surface of the battery pack. The friction blocks rotate to drive the cleaning belt to make frictional contact with the tabs on the top surface of the battery pack.

[0006] The beneficial effects of this invention are as follows: The battery pack requiring electrolyte injection is placed into the mounting frame for installation and positioning. Driven by the bottom linear module, the entire pack moves forward to below the electrolyte injection mechanism and aligns vertically with it. Subsequently, the bottom lifting cylinder precisely adjusts the battery height, and in conjunction with the longitudinal drive of the electrolyte injection drive plate, ensures a tight seal between the injection nozzle and the battery injection port, guaranteeing its sealing performance. This avoids material waste caused by electrolyte leakage during the injection process, prevents corrosion of the battery casing and surrounding components by leaked electrolyte, and reduces subsequent cleaning difficulties and the risk of battery damage.

[0007] Before electrolyte injection, a vacuum is evacuated from the inside of the injection cylinder and the battery injection channel via the evacuation port to effectively remove air and prevent air bubbles from forming during electrolyte injection. Residual air bubbles can lead to poor electrode contact, capacity decay, and shortened cycle life. This design solves this problem at its source, ensuring battery energy density and operational stability. The electrolyte is then injected into the injection cup through the liquid inlet. Once the injection volume is complete, the rod in the cup rises, and the liquid is drawn into the battery by negative pressure. Simultaneously, nitrogen gas is injected into the injection cup through the evacuation port to accelerate electrolyte entry, thus completing the injection process.

[0008] After electrolyte injection, the bottom linear module continues to drive the battery to move below the cleaning mechanism. The lifting cleaning plate of the cleaning mechanism descends, bringing the cleaning belt into contact with the battery. Subsequently, the rotating friction blocks cause the cleaning belt to rub against the tabs on the top surface of the battery pack, more efficiently removing residual electrolyte from the tab surface after electrolyte injection. The linear drive component of the cleaning mechanism can be adjusted laterally, and the lifting cleaning plate can be raised and lowered vertically. Combined with the layout design of multiple friction blocks, it can adapt to battery packs with different numbers of tabs and different heights. It can meet the production needs of multiple battery models without replacing dedicated cleaning components, improving equipment versatility and reducing production changeover costs. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of a battery electrolyte filling machine.

[0010] Figure 2 This is a schematic diagram of the liquid injection mechanism.

[0011] Figure 3 This is a schematic diagram of the injection mechanism from another perspective.

[0012] Figure 4 This is a schematic diagram of the cleaning mechanism.

[0013] Figure 5 This is a schematic diagram of the wiping module.

[0014] Figure 6 This is a schematic diagram of the wiping module from another perspective.

[0015] The reference numerals in the figures include: 1-Injection platform, 10-Bottom conveyor mechanism, 11-Bottom linear module, 12-Moving seat, 13-Bottom support frame, 14-Bottom lifting cylinder, 15-Lifting plate, 16-Surround frame, 17-Battery pack, 18-Top linear module, 2-Injection mechanism, 20-Injection gantry, 21-Injection drive plate, 22-Injection cylinder, 23-Sealing movable hole, 24-Liquid passage hole, 25-Air extraction hole, 26-Top liquid injection plate, 27-Liquid injection column, 28-Cylinder mounting plate, 29-Liquid injection lifting cylinder 3-Liquid receiving seat, 30-Injection nozzle, 31-Suction hole, 32-Suction connector, 33-Bottom suction plate 34-Liquid receiving lifting cylinder, 35-Liquid receiving telescopic cylinder, 36-Unblocking needle, 37-Bottom drive frame, 38-Unblocking lifting cylinder, 39-Lifting drive plate, 390-Bottom unblocking hole, 391-Liquid receiving hole, 392-Connecting to the liquid chamber, 4- Cleaning agencies 41-Cleaning gantry frame, 42-Linear guide rail, 43-Wiping telescopic cylinder, 44-Linear sliding seat, 45- Lateral drive arm, 46- Cleaning drive plate, 47- Limit seat, 48- Buffer, 5-First drive mechanism, 51-First rotating shaft, 52-Second rotating shaft, 53-Unwinding reel, 54-Twist reel, 55-Twist motor 56-Friction lifting cylinder, 57-Friction anti-rotation seat, 58-Drive shaft, 59-Transmission roller, 6- Wiping module 61-Longitudinal drive slot, 62-Cleaning linear module, 63-Cleaning drive base, 64-Transverse guide plate, 65-Limiting wheel, 66-Guide groove, 67-Connecting shaft, 68-Tensioning wheel, 69-Tension telescopic cylinder, 7- Rotary drive component 71-Drive box, 72-Transverse drive plate, 73-Drive gear, 74-Drive shaft, 75-Friction block, 76-Drive motor, 77-Drive gear 8-Clamping structure, 81-Clamping slot, 82-First clamping block, 83-Second clamping block, 84-Finger cylinder. Detailed Implementation

[0016] The present invention will now be described in detail with reference to the accompanying drawings.

[0017] like Figure 1-6 As shown, a multi-station lithium battery liquid injection device includes an injection platform 1, an injection mechanism 2, and a cleaning mechanism 4 for wiping the battery tabs after liquid injection. The injection mechanism 2 includes a longitudinally arranged injection gantry 20, on which a longitudinally arranged top linear module 18 is installed. A longitudinally arranged injection drive plate 21 is installed at the drive end of the top linear module 18. The top linear module 18 can drive the injection drive plate 21 to move up and down. The injection drive plate 21 is equipped with multiple injection cylinders 22. The bottom of the injection cylinder 22 is provided with an injection nozzle 30 that cooperates with the battery. The top of the injection cylinder 22 is formed with a liquid passage hole 24 and a vent hole 25. The liquid passage hole 24 is connected to the injection pump through a pipe. The vent hole 25 is connected to a vacuum pump and a nitrogen pump through a connector and a pipe.

[0018] Below the liquid injection gantry 20, there is a bottom conveying mechanism 10 for forward conveying of the battery. The bottom conveying mechanism 10 includes a bottom linear module 11 arranged along the length of the liquid injection platform 1. A movable seat 12 is installed at the drive end of the bottom linear module 11. A bottom support frame 13 is installed at the movable seat 12. A bottom lifting cylinder 14 is installed at the bottom support frame 13. A lifting plate 15 is installed at the drive end of the bottom lifting cylinder 14. A surrounding frame 16 for positioning the battery pack 17 is installed on the top of the lifting plate 15. The cleaning mechanism 4 includes a cleaning gantry 41 located behind the liquid injection gantry 20. The cleaning gantry 41 is equipped with a linear drive component that is horizontally perpendicular to the moving direction of the battery pack 17. A cleaning drive plate 46 is installed at the drive end of the linear drive component. A wiping module 6 is installed on the cleaning drive plate 46. The wiping module 6 includes a lifting cleaning plate that can move up and down. A cleaning belt that can be driven is installed on the lifting cleaning plate. Multiple friction blocks 75 are installed at the bottom of the lifting cleaning plate to drive the cleaning belt against the top surface of the battery pack 17. The friction blocks 75 rotate to drive the cleaning belt to rub against the tabs on the top surface of the battery pack 17.

[0019] The battery pack 17 requiring electrolyte injection is placed into the mounting frame 16 for installation and positioning. Driven by the bottom linear module 11, it moves forward as a whole until it is below the electrolyte injection mechanism 2 and vertically aligned with it. Subsequently, the bottom lifting cylinder 14 precisely adjusts the battery height, and in conjunction with the longitudinal drive of the electrolyte injection drive plate 21, ensures that the injection nozzle 30 fits tightly against the battery injection port, guaranteeing its sealing performance. This avoids material waste caused by electrolyte leakage during the injection process, and also prevents leaked electrolyte from corroding the battery casing and surrounding components, reducing subsequent cleaning difficulties and the risk of battery damage.

[0020] Before electrolyte injection, a vacuum is evacuated from the inside of the injection cylinder 22 and the battery injection channel through the evacuation port 25 to effectively remove air and prevent air bubbles from forming during electrolyte injection. Residual air bubbles can lead to poor contact of the internal electrodes, capacity decay, and shortened cycle life. This design solves this problem at its source, ensuring battery energy density and operational stability. The electrolyte is then injected into the injection cup through the liquid passage 24. After the injection volume is complete, the rod in the cup rises, and the liquid is drawn into the battery by negative pressure. Simultaneously, nitrogen gas is injected into the injection cup through the evacuation port 25 to accelerate the entry of electrolyte, thus completing the injection process.

[0021] After electrolyte injection, the bottom linear module 11 continues to drive the battery to move below the cleaning mechanism 4. The lifting cleaning plate of the cleaning mechanism 4 descends, bringing the cleaning belt into contact with the battery. Subsequently, the friction block 75 rotates, causing the cleaning belt to rub against the tabs on the top surface of the battery pack 17, which can more efficiently remove the electrolyte residue on the tab surface after electrolyte injection. The linear drive component of the cleaning mechanism 4 can be adjusted laterally, and the lifting cleaning plate can be raised and lowered vertically. Combined with the layout design of multiple friction blocks 75, it can adapt to battery packs 17 with different numbers of tabs and different heights. It can meet the production needs of multiple battery models without replacing dedicated cleaning components, improving equipment versatility and reducing production changeover costs.

[0022] Specifically, the injection mechanism 2 also includes a top injection plate 26 installed on top of the injection cylinder 22. The top injection plate 26 has an injection column 27 inserted into the injection cylinder 22. A cylinder mounting plate 28 is located above the top injection plate 26, and an injection lifting cylinder 29 is installed on the cylinder mounting plate 28 to drive the injection column 27 to move up and down. The top of the top injection plate 26 has a sealed movable hole 23 formed for the injection column 27 to move up and down. The bottom of the injection column 27 is sealed to the injection nozzle 30. The injection lifting cylinder 29 drives the injection column 27 to move up and down precisely along the sealed movable hole 23 of the injection cylinder 22. By controlling the stroke of the descent depth of the injection column 27, the volume of electrolyte injected in a single operation can be precisely controlled. The lifting speed of the injection column 27 can be flexibly adjusted by a cylinder speed control valve to achieve step-like control of the injection flow rate. This design is adaptable to different types and capacities of new energy vehicle batteries, enhancing the equipment's adaptability to diverse production needs. The injection column 27 and the sealing movable hole 23 of the injection cylinder 22 are precisely matched to form the first seal; the bottom of the injection column 27 and the injection nozzle 30 form the second seal. The double sealing structure greatly improves the sealing performance of the injection channel. Before injection, the injection column 27 rises to create a negative pressure inside the injection cylinder 22, completely expelling air; during injection, the injection column 27 slowly descends, and the electrolyte is smoothly pressed into the battery injection channel through mechanical extrusion, avoiding the generation of air bubbles caused by fluctuations in the supply pressure.

[0023] Furthermore, a liquid receiving seat 3 is provided below the liquid injection drive plate 21. The liquid receiving seat 3 is formed with a liquid receiving cavity 392 for containing liquid. The top of the liquid receiving seat 3 is formed with a liquid receiving hole 391 that is coaxially aligned with the liquid injection nozzle 30. The liquid receiving seat 3 is also formed with a liquid extraction hole 31, and a liquid extraction connector 32 is installed in the liquid extraction hole 31. A bottom liquid extraction plate 33 is slidably connected to the bottom of the liquid injection drive plate 21. The liquid injection drive plate 21 is provided with a liquid receiving lifting cylinder 34 that drives the bottom liquid extraction plate 33 to move up and down. A horizontally arranged liquid receiving telescopic cylinder 35 is installed on the liquid receiving lifting plate 15. The driving end of the liquid receiving telescopic cylinder 35 is connected to the liquid receiving seat 3.

[0024] In this embodiment, the liquid receiving hole 391 at the top of the liquid receiving seat 3 is coaxially aligned with the liquid injection nozzle 30. The height of the liquid receiving seat 3 is adjusted by the liquid receiving lifting cylinder 34, and the lateral position of the liquid receiving seat 3 is controlled by the liquid receiving telescopic cylinder 35. Before liquid injection, the liquid receiving hole 391 can be precisely fitted under the liquid injection nozzle 30 to form a leakage collection channel. After liquid injection, any residual dripping liquid from the liquid injection nozzle 30 can be received by the liquid receiving chamber 392, preventing electrolyte from dripping onto the battery surface, conveying mechanism, or platform, thus eliminating battery contamination, component corrosion, and material waste.

[0025] In addition, the electrolyte may contain trace impurities, or electrolyte crystals may easily form on the inner wall of the injection nozzle 30 after long-term use, causing the injection channel to narrow or even become blocked, affecting the accuracy and efficiency of the injection volume. To address this, the receiving seat 3 is also equipped with a clearing structure, which includes a clearing needle 36 that is lifted and installed on the receiving seat 3. The top of the clearing needle 36 is coaxially aligned with the injection nozzle 30. A bottom drive frame 37 is installed at the bottom of the receiving seat 3. A clearing lifting cylinder 38 is installed on the bottom drive frame 37. A lifting drive plate 39 is installed on the clearing lifting cylinder 38. Multiple clearing needles 36 are installed on the top of the lifting drive plate 39. The receiving seat 3 is formed with a bottom clearing hole 390 through which the clearing needles 36 pass. The bottom clearing hole 390 and the clearing needles 36 are sealed together to prevent leakage. The bottom clearing hole 390 is coaxially aligned with the receiving hole 391.

[0026] In this embodiment, after multiple injections, the injection can be paused. At this time, the lifting and lowering cylinder 38 drives the lifting drive plate 39, causing multiple unblocking needles 36 to rise synchronously and precisely pass through the bottom unblocking hole 390 and the liquid receiving hole 391, penetrating deep into the injection nozzle 30. The outer diameter of the unblocking needle 36 is precisely matched with the inner diameter of the injection nozzle 30, which can physically scrape away residual crystals on the inner wall, prevent the injection nozzle 30 from becoming clogged, and ensure the accuracy of the injection volume. In addition, the injection nozzle 30 is equipped with an injection flow sensor. Combined with the injection flow sensor, when an abnormal decrease in the injection speed of a certain injection nozzle 30 is detected, the individual unblocking action of the corresponding unblocking needle 36 can be automatically triggered without stopping the entire machine.

[0027] Preferably, the unblocking needle 36 can be modularly replaced according to the inner diameter and length of the injection nozzle 30, and the mounting hole of the lifting drive plate 39 is designed to be adjustable, which can be adapted to the layout of different specifications of injection nozzles 30 without affecting the compatibility of the equipment with multiple models of battery packs 17, thus ensuring the versatility of the overall equipment.

[0028] Specifically, in the cleaning mechanism 4, the linear drive component includes a linear guide rail 42 arranged along the length of the cleaning gantry 41 and a wiping telescopic cylinder 43 parallel to the linear guide rail 42. A linear sliding seat 44 is slidably mounted on the linear guide rail 42, and a transverse drive arm 45 is mounted on the linear sliding seat 44. Through the cooperation of the wiping telescopic cylinder 43 and the linear guide rail 42, the transverse drive arm 45 can move along the length of the cleaning gantry 41, realizing the transverse movement of the wiping module 6, which can cooperate with the tabs at different positions. The drive end of the wiping telescopic cylinder 43 is connected to the transverse drive arm 45, and the transverse drive arm 45 is connected to the cleaning drive plate 46. Limiting structures are installed at both ends of the linear guide rail 42. The limiting structures include an upright limiting seat 47, and a buffer 48 aligned with the transverse drive arm 45 is installed on the limiting seat 47. The limit seats 47 at both ends of the linear guide 42 provide rigid stroke limits, defining the maximum range of movement of the transverse drive arm 45, and preventing the cleaning mechanism 4 from colliding with the gantry or other components due to excessive extension and retraction of the cylinder.

[0029] Specifically, the cleaning drive plate 46 is equipped with a first drive mechanism 5 that drives the cleaning belt. The first drive mechanism 5 includes a first rotating shaft 51 and a second rotating shaft 52. The first rotating shaft 51 is equipped with an unwinding reel 53 for unwinding the cleaning belt, and the second rotating shaft 52 is equipped with a take-up reel 54 for winding the cleaning belt. The unwinding reel 53 stores new cleaning belts, and the take-up reel 54 collects used dirty cleaning belts. The take-up motor 55 drives the second rotating shaft 52 to rotate, synchronously pulling the cleaning belt out from the unwinding reel 53, passing through the wiping area, and then winding it up. The back of the cleaning drive plate 46 is equipped with a take-up motor 55 that drives the first rotating shaft 51 to rotate, and the top of the cleaning drive plate 46 is equipped with a friction lifting cylinder 56. The drive end of the friction lifting cylinder 56 is equipped with a friction anti-rotation seat 57 that is radially aligned with the unwinding reel 53. Before cleaning, the friction anti-rotation seat 57 separates, and the winding motor 55 drives the cleaning belt to release to the preset position. During cleaning, the friction lifting cylinder 56 drives the friction anti-rotation seat 57 to move radially and rub against the unwinding reel 53. At this time, the unwinding reel 53 will not rotate, and the cleaning belt at the bottom will not move. It can work with the friction block 75 to stably drive the cleaning belt to rub against the battery tabs. After cleaning, the friction anti-rotation seat 57 separates, the winding motor 55 drives the dirty cleaning belt to wind up, and at the same time releases a new cleaning belt for use.

[0030] Furthermore, the first drive mechanism 5 also includes multiple drive shafts 58 for moving the cleaning belt. Each drive shaft 58 is fitted with a transmission roller 59 that engages with the cleaning belt. The multiple drive shafts 58 are rationally arranged along the movement path of the cleaning belt. The transmission rollers 59 engage with the cleaning belt, guiding the cleaning belt along a preset trajectory through roller surface friction, preventing the cleaning belt from shifting, wrinkling, or running off-track during transmission. A clamping structure 8 is installed between adjacent drive shafts 58. The clamping structure 8 includes a clamping slot 81 formed in the cleaning drive plate 46. A first clamping block 82 and a second clamping block 83 are installed in the clamping slot 81. A finger cylinder 84 is installed on the back of the cleaning drive plate 46 to drive the first clamping block 82 and the second clamping block 83 to open and close. The cleaning belt passes between the first clamping block 82 and the second clamping block 83. The finger cylinder 84 drives the first clamping block 82 and the second clamping block 83 to open and close, allowing the cleaning belt to pass between the two clamps. During the cleaning process, the clamping structure 8 quickly closes and locks, while the synchronous friction anti-rotation seat 57 locks the unwinding reel 53, and the friction block 75 starts wiping. After cleaning, the clamping structure 8 opens, the winding motor 55 drives the dirty cleaning belt to wind up, and the new cleaning belt is guided into place by the conveyor roller 59. The clamping structure 8 then closes again to stand by. With the cleaning belt double-locked, even if the friction block 75 rotates slightly abnormally, it will not cause the cleaning belt to loosen and scratch the battery surface, ensuring the battery product qualification rate.

[0031] Furthermore, the lower half of the cleaning drive plate 46 has a longitudinally formed longitudinal drive groove 61. A cleaning linear module 62 is longitudinally mounted on the cleaning drive plate 46, and a cleaning drive seat 63 is mounted on the drive end of the cleaning linear module 62. The cleaning drive plate 46 is mounted on the cleaning drive seat 63. Driven by the cleaning linear module 62, the cleaning drive plate 46 can move along the length of the longitudinal drive groove 61. Through longitudinal position fine adjustment, the cleaning belt can be precisely aligned with the tabs at different heights. A transverse guide plate 64 is formed at the bottom of the cleaning drive plate 46. Transversely aligned limiting wheels 65 are installed at both ends of the transverse guide plate 64. The cleaning belt is driven sequentially along the conveyor roller 59, the two limiting wheels 65, and the conveyor roller 59. The limiting wheels 65 precisely control the transverse position of the cleaning belt, preventing edge lifting and middle wrinkling during transmission or wiping, ensuring that the cleaning belt always contacts the tabs in a flat state.

[0032] Preferably, the driving action of the longitudinal cleaning linear module 62 is coordinated with the lateral driving, clamping structure 8, and friction block 75 rotation through PLC system signals: Before cleaning, the height of the cleaning belt is adjusted longitudinally to align with the electrode tab, and the width of the cleaning belt is adjusted laterally to cover the electrode tab. The limit wheel 65 and the conveyor roller 59 guide the cleaning belt into position. During cleaning, the longitudinal drive can achieve reciprocating wiping according to the height of the electrode tab, and the lateral drive moves at a constant speed to cover the full width. The clamping structure 8 and the friction anti-rotation seat 57 provide double locking. After cleaning, each mechanism automatically resets, and a new cleaning belt is conveyed into position.

[0033] Furthermore, when the cleaning belt is double-locked, the friction block 75 rotates, causing the cleaning belt to rub against the electrode tabs, resulting in deformation of the cleaning belt. To prevent the cleaning belt from deforming and breaking, a tensioning wheel 68 is installed above the limiting wheel 65. The cleaning belt passes through the inside of the tensioning wheel 68. A transverse guide plate 64 has a transversely formed guide groove 66, and a connecting shaft 67 is installed in the guide groove 66. The tensioning wheel 68 is installed on the connecting shaft 67. A transversely arranged tensioning telescopic cylinder 69 is provided on the back of the transverse guide plate 64, and the tensioning telescopic cylinder 69 is driven. The connecting shaft 67 moves along the length of the guide groove 66. When the friction block 75 rotates, causing the cleaning belt to rub against the electrode tabs, the tensioning wheel 68 is linked with the tensioning telescopic cylinder 69 through the connecting shaft 67, and can move flexibly laterally along the guide groove 66. The tensioning wheel 68 moves synchronously, absorbing deformation stress and avoiding tearing or breakage caused by deformation concentrated in a fixed area of ​​the cleaning belt; this ensures that the cleaning belt is stable and does not loosen, while avoiding the risk of breakage due to excessive tension.

[0034] Furthermore, the transverse guide plate 64 is equipped with a rotating drive component 7 that drives the friction block 75. The rotating drive component 7 includes a drive box 71 installed in the transverse guide plate 64. A transverse drive plate 72 is installed inside the drive box 71. Multiple drive gears 73 are installed along the length direction of the transverse drive plate 72. Two adjacent drive gears 73 mesh and drive each other. A drive shaft 74 is installed at the bottom of the drive gears 73. The friction block 75 is installed at the bottom of the drive shaft 74. A drive motor 76 is installed at the top of the drive box 71. A drive gear 77 is installed at the drive end of the drive motor 76 and extends into the drive box 71. The drive gear 77 meshes and drives one of the drive gears 73. Multiple bottom drive holes coaxially aligned with the drive shaft 74 are formed at the bottom of the drive box 71.

[0035] In this embodiment, adjacent drive gears 73 mesh with each other. The drive motor 76 drives one of the drive gears 73 to rotate through the drive gear 77, thereby causing all drive gears 73 to rotate synchronously. All friction blocks 75 rotate synchronously, causing the corresponding cleaning belt to rub against the tab, increasing the friction area and improving friction efficiency. The drive motor 76, gear set, and drive shaft 74 are integrated into a single drive box 71, resulting in a compact overall structure. It is directly mounted on the transverse guide plate 64 without occupying additional longitudinal or transverse space of the cleaning mechanism 4. It is compatible with the original tensioning mechanism, limit wheel 65, and clamping structure 8, continuing the modular and compact layout advantages of the equipment and saving production space.

[0036] In summary, the present invention possesses the excellent characteristics described above, which enhances its effectiveness in use compared to previous technologies, making it a highly practical product.

[0037] The above description is only a preferred embodiment of the present invention. For those skilled in the art, there will be changes in the specific implementation and application scope based on the ideas of the present invention. The content of this specification should not be construed as a limitation of the present invention.

Claims

1. A multi-station electrolyte injection device for lithium batteries, comprising an injection platform, the injection platform being equipped with an injection mechanism and a cleaning mechanism for wiping the battery tabs after electrolyte injection, characterized in that: The liquid injection mechanism includes a longitudinally arranged liquid injection gantry, a longitudinally arranged liquid injection drive plate installed on the liquid injection gantry, a plurality of liquid injection cylinders installed on the liquid injection drive plate, a liquid injection nozzle that cooperates with the battery at the bottom of the liquid injection cylinder, and a liquid passage hole and an air extraction hole formed at the top of the liquid injection cylinder. Below the liquid injection gantry is a bottom conveying mechanism for forward transport of batteries. The bottom conveying mechanism includes a bottom linear module arranged along the length of the liquid injection platform. A movable seat is installed at the drive end of the bottom linear module. A bottom support frame is installed on the movable seat. A bottom lifting cylinder is installed on the bottom support frame. A lifting plate is installed at the drive end of the bottom lifting cylinder. A surrounding frame for positioning the battery pack is installed on the top of the lifting plate. The cleaning mechanism includes a cleaning gantry located behind the liquid injection gantry. The cleaning gantry is equipped with a linear drive unit that is horizontally perpendicular to the direction of movement of the battery pack. A cleaning drive plate is installed at the drive end of the linear drive unit. A wiping module is installed on the cleaning drive plate. The wiping module includes a lifting cleaning plate that can move up and down. The lifting cleaning plate is equipped with a cleaning belt that can be driven. Multiple friction blocks are installed at the bottom of the lifting cleaning plate to drive the cleaning belt to abut against the top surface of the battery pack. The friction blocks rotate to drive the cleaning belt to make frictional contact with the tabs on the top surface of the battery pack.

2. The lithium battery multi-station liquid injection device according to claim 1, characterized in that: The injection mechanism also includes a top injection plate installed on the top of the injection cylinder. The top injection plate is equipped with an injection column that is inserted into the injection cylinder. A cylinder mounting plate is provided above the top injection plate. The cylinder mounting plate is equipped with an injection lifting cylinder that drives the injection column to move up and down. The top of the top injection plate is formed with a sealed movable hole for the injection column to move up and down. The bottom of the injection column is sealed to the injection nozzle.

3. The lithium battery multi-station liquid injection equipment according to claim 2, characterized in that: A liquid receiving seat is provided below the liquid injection drive plate. The liquid receiving seat is formed with a liquid receiving cavity to accommodate liquid. A liquid receiving hole is formed on the top of the liquid receiving seat and is coaxially aligned with the liquid injection nozzle. The liquid receiving seat is also formed with a liquid extraction hole, and a liquid extraction connector is installed in the liquid extraction hole. A bottom liquid extraction plate is slidably connected to the bottom of the liquid injection drive plate. The liquid injection drive plate is equipped with a liquid receiving lifting cylinder that drives the bottom liquid extraction plate to move up and down. A horizontally arranged liquid receiving telescopic cylinder is installed on the liquid receiving lifting plate. The driving end of the liquid receiving telescopic cylinder is connected to the liquid receiving seat.

4. The lithium battery multi-station liquid injection device according to claim 3, characterized in that: The liquid receiving seat is also equipped with a dredging structure, which includes a dredging needle that is lifted and installed on the liquid receiving seat. The top of the dredging needle is coaxially aligned with the injection nozzle. A bottom drive frame is installed at the bottom of the liquid receiving seat. A dredging lifting cylinder is installed on the bottom drive frame. A lifting drive plate is installed on the dredging lifting cylinder. Multiple dredging needles are installed on the top of the lifting drive plate. The liquid receiving seat is formed with a bottom dredging hole through which the dredging needles pass. The bottom dredging hole is coaxially aligned with the liquid receiving hole.

5. The lithium battery multi-station liquid injection device according to claim 1, characterized in that: The linear drive unit includes a linear guide rail arranged along the length of the cleaning gantry and a wiping telescopic cylinder parallel to the linear guide rail. A linear sliding seat is slidably mounted on the linear guide rail, and a transverse drive arm is mounted on the linear sliding seat. The drive end of the wiping telescopic cylinder is connected to the transverse drive arm, and the transverse drive arm is connected to the cleaning drive plate. Limiting structures are installed at both ends of the linear guide rail. The limiting structures include upright limiting seats, and the limiting seats are equipped with buffers aligned with the transverse drive arms.

6. The lithium battery multi-station liquid injection device according to claim 5, characterized in that: The cleaning drive plate is equipped with a first drive mechanism that drives the cleaning belt to move. The first drive mechanism includes a first rotating shaft and a second rotating shaft. The first rotating shaft is equipped with an unwinding reel for unwinding the cleaning belt, and the second rotating shaft is equipped with a winding reel for winding the cleaning belt. A winding motor that drives the first rotating shaft to rotate is provided on the back of the cleaning drive plate. A friction lifting cylinder is installed on the top of the cleaning drive plate. A friction anti-rotation seat that is radially aligned with the unwinding reel is installed on the drive end of the friction lifting cylinder.

7. A multi-station electrolyte injection device for lithium batteries according to claim 6, characterized in that: The first drive mechanism also includes a plurality of drive shafts for moving the cleaning belt. The drive shafts are fitted with transmission rollers that drive the cleaning belt. A clamping structure is installed between two adjacent drive shafts. The clamping structure includes a clamping slot formed in the cleaning drive plate. A first clamping block and a second clamping block are installed in the clamping slot. A finger cylinder is installed on the back of the cleaning drive plate to drive the first clamping block and the second clamping block to open and close. The cleaning belt passes through the first clamping block and the second clamping block.

8. A multi-station electrolyte injection device for lithium batteries according to claim 7, characterized in that: The lower half of the cleaning drive plate has a longitudinally formed longitudinal drive groove. A cleaning linear module is mounted on the cleaning drive plate longitudinally. A cleaning drive seat is mounted on the drive end of the cleaning linear module. The cleaning drive plate is mounted on the cleaning drive seat and can move along the length of the longitudinal drive groove. A transverse guide plate is formed at the bottom of the cleaning drive plate. A transversely aligned limiting wheel is mounted at both ends of the transverse guide plate. The cleaning belt is driven sequentially along the conveyor roller, the two limiting wheels, and the conveyor roller.

9. A multi-station electrolyte injection device for lithium batteries according to claim 8, characterized in that: A tensioning wheel is installed above the limiting wheel. The cleaning belt passes through the inside of the tensioning wheel. A transverse guide plate is formed with a guide groove, and a connecting shaft is installed in the guide groove. The tensioning wheel is installed on the connecting shaft. A transversely arranged tensioning telescopic cylinder is provided on the back of the transverse guide plate, and the tensioning telescopic cylinder drives the connecting shaft to move along the length of the guide groove.

10. A multi-station liquid injection device for lithium batteries according to claim 9, characterized in that: The transverse guide plate is equipped with a rotating drive component that drives the friction block. The rotating drive component includes a drive box installed on the transverse guide plate, a transverse drive plate installed inside the drive box, and multiple drive gears arranged at equal intervals along the length of the transverse drive plate. Adjacent drive gears mesh and drive each other. A drive shaft is installed at the bottom of the drive gears, and the friction block is installed at the bottom of the drive shaft. A drive motor is installed at the top of the drive box, and a drive gear extending into the drive box is installed at the drive end of the drive motor. The drive gear meshes and drives one of the drive gears. Multiple bottom drive holes coaxially aligned with the drive shaft are formed at the bottom of the drive box.

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