Annular liquid injection machine

Abstract

The utility model provides a kind of annular liquid injection machine, comprising: rack main body, for supporting entire equipment structure;Annular guide rail is located on rack main body, it is closed annular structure;8 slider assemblies can move along the annular guide rail, fixture support plate and adjustable fixture are equipped on slider assembly, for fixed battery;Slider assembly sequentially passes multiple processing stations on the annular guide rail, to complete the liquid injection processing procedure of battery.Artificial loading position, first conveying device and first battery clamping structure are provided;Artificial unloading position, second conveying device and second battery clamping structure are provided;Flaring module is used for battery opening and degassing bag;Liquid injection module is used for liquid injection under vacuum state;Vacuum extraction and standing module is used for battery vacuum extraction and standing;Vacuum pre-packaging module is used for battery after preliminary sealing after liquid injection.Adopt annular closed guide rail structure, slider type station switching mechanism, shorten battery transmission path, improve space utilization.

Description

Technical Field

[0001] This utility model relates to the field of battery production equipment technology, and more specifically to a ring-shaped liquid injection machine. Background Technology

[0002] With the widespread adoption of 3C electronic products, smart wearable devices, and mobile terminal devices, the market demand for batteries is growing rapidly. As a core component, the electrolyte injection process in battery cell manufacturing directly impacts battery performance, yield, and safety. Currently, most commonly used battery cell electrolyte injection equipment on the market has a linear layout, resulting in large footprint, long transmission distances, and low overall efficiency. Furthermore, most equipment still relies on manual labor for key steps such as cell flaring, electrolyte injection control, packaging, and pre- and post-filling weighing, leading to low automation, insufficient production consistency, and inadequate traceability. In addition, the traditional electrolyte injection process lacks a real-time feedback mechanism, easily causing insufficient or excessive electrolyte injection, which in turn affects battery cell performance. The equipment often fails to effectively collect and trace information such as production data, personnel operations, material batches, and environmental parameters, hindering product quality control and smart factory construction. Therefore, there is an urgent need for a compact, highly automated battery cell electrolyte injection equipment with precise electrolyte injection control and full-process traceability to improve battery production efficiency and quality control capabilities. Utility Model Content

[0003] In view of this, the present invention provides a ring-shaped liquid injection machine.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A ring-shaped liquid injection machine includes: a frame body for supporting the entire equipment structure; a ring-shaped guide rail on the frame body, forming a closed ring structure; eight slider assemblies that can move along the ring-shaped guide rail, each slider assembly having a clamp support plate and an adjustable clamp for fixing the battery cell; the slider assemblies sequentially pass through multiple processing stations on the ring-shaped guide rail to complete the liquid injection process of the battery cell. The manual feeding station is equipped with a first conveying device and a first cell clamping structure. The first conveying device is used to transport the cells on the first cell clamping structure to one of the slider assemblies. The manual unloading station is equipped with a second conveying device and a second cell clamping structure. The second conveying device is used to transport the cells on one of the slider assemblies to the second cell clamping structure. A flaring module is used for opening the cells and degassing the cells. A liquid injection module includes a vacuum chamber, a liquid injection pump, and a liquid injection needle for liquid injection under vacuum. A vacuum evacuation and settling module includes multiple vacuum chambers, a vacuum pump, sensors, and valves for vacuuming and settling the cells. A vacuum pre-sealing module includes a heating cap and a temperature control device for initial sealing of the cells after liquid injection.

[0006] In the preferred technical solution, the multiple processing stations include the following stations: a loading station, where a first conveying device can transport the battery cells to be processed from the first battery cell clamping structure to this station; a flaring station, where a flaring module is located above it; a liquid injection station, where a liquid injection module is located above it; a first settling station and a second settling station, where vacuum settling modules are provided at corresponding positions; a vacuum packaging station, where a vacuum pre-packaging module is provided at a corresponding position; a unloading station, where a second conveying device can transport the battery cells arriving at this station to the second battery cell clamping structure; and an automatic changing station.

[0007] The preferred technical solution also includes a front weighing module, a rear weighing module, and a barcode scanning device. Both the front and rear weighing modules include an electronic weighing unit for collecting the weight of the battery cells. The electronic weighing unit uses an electronic balance with a maximum capacity of 220 grams and an accuracy of 0.001 grams, and is equipped with a windproof cover and a shockproof bracket. The barcode scanning device supports switching between front and back barcode scanning.

[0008] In a preferred embodiment, the slider assembly is connected to the annular guide rail via a linear guide rail and a servo drive system, which controls the slider assembly to precisely position itself at each workstation.

[0009] In the preferred technical solution, the flaring module includes a servo-driven suction cup bag opening mechanism, a mechanical flaring plate, and a nitrogen flaring device; the nitrogen flaring device includes a nitrogen pipeline with adjustable pressure from 0.1 to 0.4 MPa and adjustable blowing time; the flaring module can handle battery cells with a minimum height of 17 mm.

[0010] In the preferred technical solution, the injection accuracy of the injection module is as follows: atmospheric pressure injection 0.1 to 3 g ± 0.03 g, 3 to 6 g ± 0.05 g; vacuum injection 0.1 to 3 g ± 0.05 g, 3 to 6 g ± 0.08 g; the injection needle has a scraping and anti-drip function, and is equipped with a throttling valve and a waste liquid collection device.

[0011] In the preferred technical solution, the vacuuming and settling module includes a segmented vacuuming control system, which achieves a vacuum level of -95 kPa and a leakage rate of less than or equal to 5 kPa per minute; the vacuuming time and number of vacuuming cycles can be set.

[0012] In the preferred technical solution, the vacuum pre-packaging module includes 8 independent end caps, each end cap being equipped with a temperature control device; the maximum operating temperature of the end caps is 220 degrees Celsius, and the temperature difference at each point is within ±5 degrees Celsius; the packaging pressure adjustment accuracy of the vacuum pre-packaging module is 0.02 MPa, and the packaging time is adjustable.

[0013] In the preferred technical solution, both the first and second battery cell clamping structures adopt a waterwheel-type conveying mechanism driven by a servo motor; the second battery cell clamping structure is equipped with a defective product sorting function.

[0014] As can be seen from the above technical solution, compared with the prior art, the present invention has the following beneficial technical effects:

[0015] Employing a circular closed guide rail structure and a slider-type workstation switching mechanism, with functional modules distributed along the guide rail, significantly shortens the cell transmission path and improves space utilization. It achieves fully automated control of the entire process from manual loading, barcode scanning and weighing, flaring, vacuum liquid injection, settling, pre-packaging, post-weighing to unloading, significantly reducing manual intervention and improving production efficiency and stability. It supports pre- and post-weighing comparison, automatically determines the liquid injection volume, and the barcode scanning system can collect information on personnel, equipment, products, materials, and processes throughout the entire process, meeting the needs of quality traceability and production record keeping. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the exploded structure of this utility model. Figure 1 .

[0018] Figure 2 This is a schematic diagram of the exploded structure of this utility model. Figure 2 .

[0019] Figure 3 This is a schematic diagram of the exploded structure of this utility model. Figure 3 .

[0020] Figure 4 This is a schematic diagram of the exploded structure of this utility model. Figure 4 .

[0021] Figure 5 This is a three-dimensional structural diagram of the present invention.

[0022] Reference numerals: 1. Main frame; 2. Circular guide rail; 3. Slider assembly; 5. Flaring module; 6. Liquid injection module; 7. Vacuuming and settling module; 8. Vacuum pre-packaging module; 9. Front weighing module; 10. Rear weighing module; 11. Manual loading station; 111. First conveying device; 112. First cell clamping structure; 12. Manual unloading station; 121. Second conveying device; 122. Second cell clamping structure; 13. Barcode scanning device; 101. Loading station; 102. Flaring station; 103. Liquid injection station; 104. First settling station; 105. Second settling station; 106. Vacuum packaging station; 107. Unloading station; 108. Automatic changeover station; 200. Operator; 201. Feeding transition chamber; 202. Discharge transition chamber. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0024] In the description of this application, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0026] like Figures 1-5 As shown, a ring-shaped liquid injection machine adopts a ring-shaped guide rail and multi-station slider structure, integrating multiple functional modules such as flaring, liquid injection, vacuuming, pre-packaging, weighing, and barcode scanning, to achieve efficient, precise, and automated operation in the cell liquid injection process. The overall structure of this ring-shaped liquid injection machine mainly includes the following components:

[0027] Frame body 1: Used to support the overall structure of the equipment, bearing the guide rails, modules and conveying components. It adopts a welded steel frame structure, which has high stability and shock resistance.

[0028] Circular guide rail 2: Fixed to the main frame, it is a closed ring structure, which can be circular or elliptical. The path length and efficiency are optimized according to the spatial layout. Circular guide rail 2 has a fine positioning function after each run, with a positioning accuracy within 0.2mm.

[0029] Slider assembly 3: Distributed along the annular guide rail, a total of 8, achieving precise movement and positioning via a servo motor drive system. The 8 slider assemblies 3 correspond to 8 workstations on the annular guide rail 2. After completing one process at one workstation, the slider assembly 3 slides along the annular guide rail 2 to the next workstation to perform the next process. Each slider is equipped with a clamping support plate and an adjustable cell clamp, which can adjust the height and width to accommodate cells of different sizes. Each clamp can hold 8 cells, and the clamp is driven by an electric push rod to clamp and release the cells.

[0030] Manual feeding station 11: Equipped with a first conveying device 111 and a first battery cell clamping structure 112. This clamping structure uses a waterwheel feeding method, driven by a servo motor, to achieve precise intermittent feeding. The clamping structure has a buffer area to ensure a stable supply of battery cells. The first conveying device 111 lifts the battery cells from the clamping structure and precisely transports them to the slider assembly 3.

[0031] Manual unloading station 12: Equipped with a second conveying device 121 and a second cell clamping structure 122, also using a waterwheel-type unloading method, and equipped with NG (defective) sorting function. The second conveying device 121 transports the processed cells from the slider assembly 3 to this position, and then the clamping structure transfers them to the unloading position or NG area. The operator 200 manually removes the unloaded cells. The distance between the operator 200 and the battery placement position of the clamp should conform to ergonomics, with the furthest straight-line distance within 450mm, that is, the distance between the operator 200 and the first cell clamping structure 112 and the second cell clamping structure 122 should be within 450mm, facilitating manual loading and unloading operations.

[0032] Furthermore, the functional module configuration and working principle are as follows:

[0033] Front weighing module 9: Located after the manual loading station 11. Includes a high-precision electronic balance (maximum capacity 220g, accuracy 0.001g). Barcode scanning device 13: The barcode scanning device supports automatic switching between front and back scanning to ensure accurate barcode reading. The module collects the initial cell weight and serial number information for subsequent process tracking. Rear weighing module 10: Has the same structure as the front weighing module 9, located after the manual unloading station 12.

[0034] Flaring Module 5: Composed of a suction cup bag opening mechanism, a mechanical flaring plate, and a nitrogen flaring device. The flaring mechanism is servo-driven. The suction cup adsorbs the air bag on top of the battery cell, and after being pulled open, the flaring plate expands the opening. Simultaneously, adjustable nitrogen gas (0.1–0.4 MPa) quickly blows open the air bag, facilitating liquid injection. The blowing time and pressure can be adjusted via the HMI interface, and it can handle battery cells as small as 17 mm in height.

[0035] Injection Module 6: This module comprises multiple injection units distributed within a sealed vacuum chamber inside the guide rail. Each unit is equipped with an injection pump, injection needle, and control valve. It supports both atmospheric pressure and vacuum injection modes. High injection accuracy is achieved: atmospheric pressure injection error ±0.03g (0.1–3g) and ±0.05g (3–6g), while vacuum injection error ±0.05g (0.1–3g) and ±0.08g (3–6g). The injection needle features a scraping structure to prevent dripping, and a waste liquid collection box and throttling valve are located at the bottom.

[0036] Vacuum-Pumping and Stabilization Module 7: Employs a segmented vacuuming method, achieving a vacuum level of -95 kPa with a leakage rate not exceeding 5 kPa / min. The module contains multiple vacuum chambers and temperature and humidity sensors; the vacuuming time and number of cycles can be adjusted via the control system. This process facilitates the removal of internal gas and thorough electrolyte penetration. Vacuum Pre-Sealing Module 8: Contains 8 sealing heads, each with an independent temperature controller. Heating temperature can reach 220℃, with the temperature difference between each sealing head controlled within ±5℃. Sealing head pressure adjustment accuracy reaches 0.02 MPa, and the sealing time supports multi-stage settings to ensure consistent and reliable sealing results.

[0037] Post-weighing module 10: The processed battery cells are brought to this module by the slider, where their weight is collected again. The difference between the weight and the previous weighing data is calculated to determine the qualification of the liquid injection. The data is synchronously uploaded to the MES system for traceability. In addition, this ring-shaped liquid injection machine is equipped with a highly integrated automatic control system to coordinate the operation of various functional modules and realize automatic control and data management of the entire process of battery cell loading and unloading. This control system generally includes a main control unit and a human-machine interface. The main control unit uses a PLC controller (or an industrial control all-in-one computer) as the core control unit, responsible for data acquisition and command transmission from various sensors, drivers, and actuators; controlling the action flow and running rhythm of each station, and synchronously coordinating the movement of the slider assembly 3 on the ring guide rail 2 to realize closed-loop logic control. The human-machine interface has a touch screen interface, supporting multi-level menus and permission management; operators can perform operations such as product parameter setting, process adjustment, formula selection, status monitoring, and alarm record viewing on it; after parameter adjustment, the system can automatically match the equipment status and complete the automatic linkage configuration of the modules. The control system works in conjunction with the barcode scanning device, weighing device, liquid injection metering system, and NG judgment logic; it collects information such as cell barcodes, liquid injection volume, pre- and post-weighing data, and packaging status in real time; it can upload the above information to the system to achieve complete traceability of production data, including operator, equipment ID, batch number, timestamp, etc. Through pre- and post-weighing comparison and liquid injection volume monitoring, it achieves closed-loop control of liquid injection accuracy.

[0038] Furthermore, all slider assemblies 3 and the circular guide rail 2 are driven by a linear guide rail combined with a servo motor, providing precise positioning capabilities. This, combined with industrial PLC logic control, ensures the orderly flow of the sliders between workstations. For example... Figure 2 As shown, the eight slider assemblies 3 on the annular guide rail 2 are positioned at eight different locations, corresponding to different workstations for different processes. Viewed from above, the slider assemblies 3 in this embodiment move clockwise on the annular guide rail 2. The eight workstations are: loading station 101, flaring station 102, liquid injection station 103, first settling station 104, second settling station 105, vacuum sealing station 106, unloading station 107, and automatic changeover station 108. The structural mechanisms for each process are installed near the corresponding workstation to perform the corresponding process on the battery cells at that workstation. The entire machine is centrally managed by an industrial-grade control system, possessing functions such as motion control, human-machine interaction, data acquisition, anomaly alarm, and remote diagnostics. Operators can set parameters and monitor in real time via a touch-screen HMI panel. The system interface supports multi-language switching, permission management, and automatic data recording.

[0039] Furthermore, the workflow is explained below. Operator 200 operates from the front of the machine, where a workbench is located. On either side of the workbench are a feeding transition chamber 201 and a discharging transition chamber 202. Operator 200 manually places the battery cells from the oven into the feeding transition chamber 201. The transition chamber's conveyor belt automatically transports the battery cells to the workbench. Operator 200 then places the unfilled battery cells sequentially into the first battery cell clamping structure 112. The waterwheel structure of the first battery cell clamping structure 112 rotates, and the barcode scanning device 13 automatically scans each battery cell. After scanning, the battery cells are transported to a position below the first conveying device 111, which is a robotic arm structure. The barcode-cleaned battery cells are moved to the front weighing module 9 for weighing. The system automatically weighs the battery cells and uploads the data. The first conveying device 111 then transports the scanned and weighed battery cells to the sliding component 3 of the corresponding loading station 101 for clamping and fixing. The circular guide rail 2 automatically transports the battery cells to the flaring station 102, where the flaring module 5 automatically flares the battery cells. After the flaring is completed, the annular guide rail 2 transports the battery cell to the liquid injection station 103, where the liquid injection module 6 performs vacuum liquid injection on the battery cell. The annular guide rail 2 then sequentially transports the liquid-injected battery cell to the first settling station 104 and the second settling station 105 for two vacuum settling processes. Both the first settling station 104 and the second settling station 105 are equipped with vacuum settling modules 7, which perform vacuum settling on the battery cells at the first settling station 104 and the second settling station 105, respectively. The annular guide rail 2 automatically transports the set battery cell to the vacuum packaging station 106, where the vacuum pre-packaging module 8 automatically vacuum seals the battery cell. The circular guide rail 2 rotates the battery cell to the unloading station 107. The second conveying device 121 conveys the battery to the rear weighing module 10. The system automatically weighs the battery cell and identifies good products. The second conveying device 121 automatically conveys good batteries to the second clamping structure 122, while defective products are conveyed to the defective area. When the battery cell has completed liquid injection and enters the rear weighing module 10, the weight of the battery cell is weighed by an electronic balance. Combined with the initial weight recorded by the front weighing module 9, the liquid injection weight gain is automatically calculated. The system compares the weight gain with the set liquid injection target value. If it exceeds the allowable deviation range, it is judged as an NG product. At the same time, it uses the barcode information read by the barcode scanning device for unique identification to ensure data consistency. The control system is equipped with a PLC or industrial computer to receive data such as front and rear weighing, barcode scanning, and liquid injection volume.

[0040] The system automatically determines whether the battery cell is qualified according to the set rules and outputs "OK" or "NG" control signals to the sorting drive system. The second battery cell clamping structure 122 adopts a servo-driven waterwheel type conveyor structure with multi-station rotation positioning function; the waterwheel mechanism has at least two unloading stations, and the battery cell is released by the unloading mechanism after rotating to the corresponding position; if the PLC determines that it is an NG product, the waterwheel will rotate the battery cell to the NG unloading position and send it into the NG recycling box or defective product box through a special slide or sorting device; if it is an OK product, it will be conveyed to the qualified product collection position, and the operator 200 will collect the qualified battery cell that has completed all processes from the second conveyor device 121.

[0041] Furthermore, in the cell flaring process, a motor-driven suction cup opens the bag, and the flaring plate and compression method are used to flare the air bag; in the cell liquid injection process, vacuum liquid injection is used, with 6 liquid injection modules equipped with 8 liquid injection pumps. Small batteries have an air bag support function, large batteries have a suction cup opening function, the liquid injection needle has a liquid scraping function, the liquid injection needle structure has a throttle valve, and waste liquid has a collection function; in the vacuuming and settling process, there are 2 stations to perform 2 vacuuming and settling processes, with a vacuuming time of 10-15 seconds; in the vacuum pre-sealing process, 8 cells are sealed, and each set of sealing heads has 2 sets of temperature monitoring alarms; in the post-liquidation barcode scanning and weighing process, there must be a post-liquidation weighing, an independent electronic weighing module, module pick-up and drop battery transfer, and a barcode scanning NG solution; the first conveying device 111 and the second conveying device 121 have a three-axis servo module gripper mechanism to transfer the cell loading and unloading for manual picking.

[0042] Furthermore, the process requirements for each step of the equipment are as follows: 1. Electronic balance display accuracy ±0.001g; barcode scanner installation position allows scanning of both sides of the battery; 2. NG collection box for classifying and collecting poorly flared and poorly filled batteries; 3. Flaring suction cup screw servo control; flaring must ensure effective flaring even for cells with a minimum height of 17mm; nitrogen or dry gas is used to open the air bag; 6. Filling suction cup screw servo motor control; vacuum filling method, within -40Kpa vacuum; 7. Equipment atmospheric pressure filling accuracy 0.1-3g±0.03g, 3g-6g±0.05g (CPK≥1.33, 32 cells tested); equipment vacuum filling accuracy 0.1-3g±0.05g, 3g-6g±0.08g (CPK≥1.33, 32 cells tested); 8. The injection needle has a scraping and anti-drip function, a moving cleaning and waste liquid collection function, and a throttling valve function; 9. The injection tank is a three-stage tank with automatic liquid replenishment, residual liquid discharge, stirring, vacuuming, and bubble removal functions; 10. The vacuum injection chamber is equipped with an observation window; 11. The vacuuming and settling chamber can be segmented, and the vacuuming time and number of times can be set; 12. Vacuum degree of the vacuuming and settling chamber: -95Kpa, leakage rate ≤5kpa / min; 13. The pre-sealing mechanism has 8 sets of end caps, with an end cap length of 102mm, a maximum end cap working temperature of 220℃, a maximum temperature difference of ±5℃ at various points on the end cap, a sealing pressure adjustment accuracy of 0.02mpa, and an adjustable sealing time; 14. The cell transfer module robot uses pneumatic clamping to hold the cell without damaging the cell body, has a cell buffer material preparation position, and the ring clamp flaring station has a cell correction function.

[0043] Furthermore, during the front scanning and weighing process, the manually discharged battery cell moves to the first battery cell clamping structure 112, and the battery cell is in the scanning station of its servo waterwheel structure, immediately triggering scanning; the battery cell is moved to the next station through the waterwheel structure; the first conveying device 111 takes the scanned battery cell from the clamp and puts it into the electronic balance for weighing; four battery cells are grabbed each time for scanning and weighing; the weighing and scanning data are connected to the host computer and automatically transmitted; after the pneumatic gripper holds the battery cell air bag, there are no suction marks on the surface of the battery cell body; the electronic balance has an independent support to prevent vibration and a protective cover to prevent wind, ensuring accurate data during weighing; there is a battery cell material buffer mechanism at the front scanning position to avoid quantity mismatch; the front and rear scanning and weighing module consists of: 8 sets of electronic balances and 1 set of barcode scanners. Mistake-proofing methods: Independent weighing platform to prevent the impact of machine vibration on weighing; reliable electronic scale positioning, each battery must be weighed vertically on its corresponding electronic scale during the weighing process, and there should be no misalignment with the scanning sequence. Both software and hardware must have mistake-proofing measures; the bottom of the electronic scale uses a marble platform and the top is equipped with a windproof cover; key process and quality requirements: 1. The barcode scanning module (hardware + software) must have a mechanism to prevent errors (duplicate codes, missing codes, wrong codes, etc.); 2. Weighing CPK ≥ 1.33, calculation method: 32ea cells must be checked; 3. Data is stored in a local database + MES (or BIS), making data inspection convenient and easy to trace.

[0044] Furthermore, in the cell flaring process, after the sliding component 3 is in place, the suction cup of the flaring module 5 descends, and the servo drives the suction cup to open the bag; the suction cup vacuum is independently displayed and controlled; and a nitrogen flaring function is required.

[0045] The syringe is inserted into the battery cell gas bag and filled with nitrogen or dry gas. The gas pressure is adjustable from 0.1 to 0.4 MPa, and the blowing time is adjustable. It should have a mechanical flaring function. In the cell electrolyte filling process, after the sliding component 3 is in place, the filling chamber of the filling module 6 descends and begins vacuuming, reaching a vacuum of -40Kpa; the suction cup moves left and right to open the bag again, and the stepper moves back and forth to drive the suction cup to open the bag; the filling needle descends into the cell air bag, and then vacuum filling begins; the filling needle is manually controlled to move, and there is an automatic waste liquid discharge function, with a waste liquid storage tank; the filling tank is a three-stage tank with automatic replenishment, residual liquid discharge, stirring, vacuuming, and de-bubbling functions; the filling pump accuracy is 0.005g, the equipment's atmospheric pressure filling accuracy is 0.1-3g±0.03g, 3g-6g±0.05g (CPK≥1.33, 32 cells tested); the equipment's vacuum filling accuracy is 0.1-3g±0.05g, 3g-6g±0.08g (CPK≥1.33, 32 cells tested); the error-proof requirements are: no dripping from the filling needle contaminates the battery during production; no electrolyte contamination; and easy cleaning.

[0046] Furthermore, in the vacuum pre-packaging process, after the battery clamp of the sliding component 3 is in place, the packaging cavity descends and presses against the base plate to seal the cavity, completing the vacuuming, packaging, and vacuum release actions. Vacuum holding time: can be set according to the process. Packaging cavity vacuum degree: can be set according to the process, with real-time vacuum degree monitoring and alarm function. Packaging is performed after vacuum holding is completed. Each set of end caps has an independently operating end cap, with a 5mm serrated end cap for sealing. The maximum working temperature of the end cap is 220℃, and the maximum temperature difference at various points on the end cap is ±5℃. The temperature has a real-time monitoring and alarm function; if the end cap temperature exceeds the maximum set value range, the system automatically cuts off the main heating power supply. The vacuum pre-packaging module 8 has three sets of temperature sensors, two sets monitor each other, and one set is connected to the outside of the equipment for inspection; the end cap cylinder is equipped with a digital display pressure gauge, with a packaging pressure adjustment accuracy of 0.02MPa. The packaging pressure range can be set, and the equipment will alarm if the pressure is outside the range.

[0047] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A ring-shaped liquid injection machine, characterized in that: include: The main frame (1) is used to support the entire equipment structure; The annular guide rail (2) located on the main body of the frame has a closed annular structure; Eight slider assemblies (3) that can move along the annular guide rail are provided with a clamp support plate and an adjustable clamp for fixing the battery cell; the slider assembly (3) passes through multiple processing stations on the annular guide rail (2) in sequence to complete the electrolyte injection process of the battery cell. The manual feeding station (11) is equipped with a first conveying device (111) and a first battery cell clamping structure (112). The first conveying device (111) is used to convey the battery cells on the first battery cell clamping structure (112) to one of the slider assemblies (3). The manual unloading position (12) is equipped with a second conveying device (121) and a second battery cell clamping structure (122). The second conveying device (121) is used to convey the battery cell on one of the slider assemblies (3) to the second battery cell clamping structure (122). The flaring module (5) is used for opening the battery cell and degassing the bag; The liquid injection module (6) includes a vacuum chamber, a liquid injection pump and a liquid injection needle, which are used to inject liquid under vacuum conditions; The vacuuming and settling module (7) includes multiple vacuum chambers, a vacuum pump, sensors and valves, used for vacuuming and settling of the battery cells; The vacuum pre-sealing module (8) includes a heating head and a temperature control device for initial sealing of the battery cell after liquid injection.

2. The annular liquid injection machine according to claim 1, characterized in that: The multiple processing stations include the following stations: loading station (101), where a first conveying device (111) can convey the cells to be processed on the second cell clamping structure (122) to this station; flaring station (102), where a flaring module (5) is set above it; liquid injection station (103), where a liquid injection module (6) is set above it; first settling station (104) and second settling station (105), where a vacuum settling module (7) is provided at the corresponding position of both; vacuum packaging station (106), where a vacuum pre-packaging module (8) is provided at the corresponding position; unloading station (107), where a second conveying device (121) can convey the cells arriving at this station to the second cell clamping structure (122); and automatic changing station (108).

3. The annular liquid injection machine according to claim 1, characterized in that: Also includes: The front weighing module (9), the rear weighing module (10), and the barcode scanning device (13) are provided. Both the front weighing module (9) and the rear weighing module (10) include an electronic weighing unit for collecting the weight of the battery cell. The electronic weighing unit adopts an electronic balance with a maximum range of 220g and an accuracy of 0.001g, and is equipped with a windproof cover and a shockproof bracket. The barcode scanning device (13) supports switching between front and back barcode scanning.

4. The annular liquid injection machine according to claim 1, characterized in that: The slider assembly (3) is connected to the annular guide rail (2) via a linear guide rail and a servo drive system. The servo drive system is used to control the slider assembly (3) to be precisely positioned at each work station.

5. The annular liquid injection machine according to claim 1, characterized in that: The flaring module (5) includes a servo-driven suction cup bag opening mechanism, a mechanical flaring plate, and a nitrogen flaring device. The nitrogen flaring device includes a nitrogen pipeline with adjustable pressure between 0.1 and 0.4 MPa and adjustable blowing time; the flaring module (5) can handle battery cells with a minimum height of 17 mm.

6. The annular liquid injection machine according to claim 1, characterized in that: The injection accuracy of the injection module (6) is as follows: atmospheric pressure injection 0.1-3g±0.03g, 3-6g±0.05g; vacuum injection 0.1-3g±0.05g, 3-6g±0.08g; the injection needle has a scraping and anti-drip function and is equipped with a throttle valve and a waste liquid collection device.

7. The annular liquid injection machine according to claim 1, characterized in that: The vacuuming and settling module (7) includes a segmented vacuuming control system, with a vacuum level of -95KPa and a leakage rate of ≤5kPa / min; the vacuuming time and number of vacuuming cycles of the vacuuming and settling module (7) can be set.

8. The annular liquid injection machine according to claim 1, characterized in that: The vacuum pre-packaging module (8) includes 8 independent end caps, each end cap being equipped with a temperature control device; the maximum working temperature of the end cap is 220℃, and the temperature difference at each point is within ±5℃; the packaging pressure adjustment accuracy of the vacuum pre-packaging module (8) is 0.02MPa, and the packaging time is adjustable.

9. A ring-shaped liquid injection machine according to claim 1, characterized in that: Both the first battery cell clamping structure (112) and the second battery cell clamping structure (122) adopt a waterwheel-type conveying mechanism driven by a servo motor; the second battery cell clamping structure (122) is equipped with an NG sorting function.

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