Electrolyte filling device for lithium battery production

Abstract

This invention discloses an electrolyte filling device for lithium battery production, relating to the field of lithium battery manufacturing technology. The device includes a filling machine frame, a filling assembly, and an intelligent detection structure. The intelligent detection structure is connected to the filling assembly in a closed-loop filling control system, which is integrated into the controller and includes a servo positioning unit, a liquid level acquisition unit, a wetting fitting unit, an adaptive correction unit, and a filling linkage control unit. The servo positioning unit generates a traversal path based on the battery separator layout, driving a linear motor and a telescopic motor to move, so that the laser rangefinder sensor sequentially aligns with each measurement window to complete multi-zone liquid level acquisition. The wetting fitting unit constructs a dynamic wetting model based on the multi-zone liquid level data and generates a wetting threshold. This invention can comprehensively acquire multi-zone liquid level data, accurately determine the wetting state, and dynamically calibrate the filling volume, solving problems such as insufficient detection, inaccurate wetting determination, and low filling accuracy in existing equipment, thereby improving filling quality and production efficiency.

Description

Technical Field

[0001] This invention relates to the field of electrolyte filling technology, and more particularly to an electrolyte filling device for lithium battery production. Background Technology

[0002] Electrolyte filling is a core process in lithium battery cell manufacturing, directly determining the cell's electrochemical performance, cycle life, and safety. The industry generally employs a three-stage process: "coarse filling - standing soaking - fine filling." Accurate determination of the electrolyte soaking state during the standing stage is crucial for controlling filling quality and production efficiency.

[0003] Existing filling equipment often uses a fixed single-point detection mode for liquid level detection. However, lithium batteries are divided into multiple independent chambers by diaphragms and electrode groups. Single-point detection can only obtain liquid level data for a single area, which cannot fully reflect the overall immersion status of the cell. This can easily lead to problems such as inaccurate immersion judgment, insufficient cell immersion, and unreasonable control of the resting time.

[0004] Meanwhile, the existing equipment operates independently in an open-loop manner for testing and liquid injection. The precision liquid injection mostly uses preset fixed values, which cannot be adapted to the actual wetting loss of individual battery cells, resulting in poor liquid injection accuracy. Furthermore, it cannot automatically adapt to different battery models, and the equipment has weak flexibility, making it difficult to meet the flexible production requirements of the production line. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing an electrolyte filling device for lithium battery production.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an electrolyte filling device for lithium battery production, comprising...

[0007] Compared with the prior art, the beneficial effects of the present invention are: 1. This solution, through an intelligent detection structure and servo positioning unit, can automatically traverse each measurement window according to the internal diaphragm layout of the battery, realizing comprehensive acquisition of the liquid level in multiple zones within the injection chamber. It replaces the existing fixed single-point detection method, effectively solving the problems of inaccurate wetting state judgment and insufficient settling caused by the difference in liquid level in multiple chambers inside the battery. It achieves accurate and comprehensive control of the electrolyte wetting state during the settling stage, providing reliable data support for the injection process.

[0008] 2. This solution achieves closed-loop coordination of the entire process of liquid level acquisition, wetting fitting, and liquid injection regulation through a closed-loop liquid injection control system. It can dynamically generate liquid injection parameters based on real-time liquid level data from multiple zones, replacing the existing open-loop control method with fixed liquid injection volume. This effectively solves the problems of low liquid injection accuracy and excessive or insufficient liquid injection volume caused by the independent detection and liquid injection links and the inability to adapt to individual wetting losses, thereby improving the accuracy and uniformity of electrolyte addition.

[0009] 3. This solution, through the cooperation of the adaptive correction unit and the liquid injection linkage control unit, can automatically adapt to different diaphragm layouts and different models of battery products. There is no need for manual adjustment of detection points and liquid injection parameters. It effectively solves the problem of poor flexibility and adaptability of existing equipment and inability to meet the production needs of multiple models. It simplifies the operation process, reduces manual intervention, and improves the versatility of equipment and the overall production efficiency of the production line.

[0010] In summary, this solution, through the cooperation of an intelligent detection structure and a closed-loop electrolyte injection control system, optimizes the entire process of electrolyte filling in lithium batteries by comprehensively detecting multi-zone liquid levels, accurately determining immersion status, and dynamically calibrating injection parameters. It effectively solves the problems of insufficient detection, inaccurate judgment, low injection precision, and poor equipment adaptability in existing technologies. While improving the quality and accuracy of electrolyte filling, it also enhances equipment versatility and production efficiency, ensuring the consistency and stability of finished lithium battery cells. Attached Figure Description

[0011] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a three-dimensional schematic diagram of the overall appearance of the device proposed in this invention; Figure 2 This is a three-dimensional schematic diagram of the intelligent detection structure proposed in this invention; Figure 3 This is a three-dimensional schematic diagram of the intelligent detection structure proposed in this invention; Figure 4 This is a schematic diagram of the working state of the intelligent detection structure proposed in this invention; Figure 5 This is a block diagram illustrating the overall principle of the closed-loop liquid injection control system proposed in this invention.

[0012] The components in the diagram are numbered as follows: 1. Metal mounting clip; 2. Connecting bolt; 3. Linear motor; 4. Telescopic motor; 5. Laser rangefinder sensor; 6. Cable management sleeve; 7. Slide bar; 8. Clamping frame; 9. Injection chamber; 10. Battery cover; 11. Injection port; 12. Measuring window; 13. Lifting seat; 14. Injection machine frame; 15. Telescopic cylinder; 16. Distribution valve; 17. Storage bottle; 18. Air pump; 19. Controller. Detailed Implementation

[0013] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0014] See Figures 1 to 4 The present invention discloses an electrolyte filling device for lithium battery production, comprising a filling machine frame 14 horizontally mounted on the ground, a filling component for completing the filling work installed on the filling machine frame 14, a metal mounting clip 1 installed on the lower part of the front end face of the filling machine frame 14, and an intelligent detection structure for comprehensively detecting the filling liquid level height installed on the metal mounting clip 1. Through the intelligent detection structure, the device can automatically locate each battery detection window during its static stage, thereby obtaining more comprehensive liquid level height data and improving the filling quality of the device.

[0015] Reference Figure 2 and Figure 3 As shown, the intelligent detection structure includes connecting bolts 2 inserted into the through holes on both sides of the metal mounting clamp 1. The connecting bolts 2 are screwed and fixed on the liquid injection machine frame 14. The metal mounting clamp 1 is clamped and fixed on the liquid injection machine frame 14 by the connecting bolts 2. A linear motor 3 is horizontally mounted on the front end face of the metal mounting clamp 1. A telescopic motor 4 is mounted and fixed on the sliding seat of the linear motor 3. The telescopic motor 4 is located below the metal mounting clamp 1 and is vertically crisscrossed. A laser range sensor 5 is installed at the telescopic end of the rear end of the telescopic motor 4. The detection port of the laser range sensor 5 is vertically downward. The upper wire of the laser range sensor 5 is vertically bent and extends forward and passes through the metal mounting clamp 1. A cable management sleeve 6 is sleeved at the point where the upper wire of the laser range sensor 5 passes through the metal mounting clamp 1. The cable management sleeve 6 is horizontally slidably connected to the slide bar 7 opened on the metal mounting clamp 1.

[0016] Reference Figure 1 and Figure 4As shown, the liquid injection assembly includes a clamping frame 8 located below the metal mounting clamp 1. Multiple liquid injection chambers 9 are equidistantly clamped and fixed inside the clamping frame 8. A battery cover 10 is sealed and fixed to the top surface of each liquid injection chamber 9. A liquid injection port 11 is opened on one side of the top surface of the battery cover 10, and multiple measuring windows 12 are opened on the other side of the top surface of the battery cover 10, corresponding to the position of the diaphragm inside the liquid injection chamber 9. A lifting seat 13 is mounted on the bottom surface of the clamping frame 8 via a metal frame. The lifting seat 13 is mounted on the top front end of the liquid injection machine frame 14. Multiple vertically arranged telescopic cylinders 15 are installed above the metal mounting clamp 1 on the front end of the liquid injection machine frame 14. Each telescopic cylinder 15 has an upward-facing extension valve 16 connected to its lower extension end. A storage bottle 17 is installed and connected to each extension valve 16. The extension valve 16 is mounted on the liquid injection machine frame 14. An air pump 18 is installed on one side of the liquid injection machine frame 14, and a controller 19 is installed at the other end of the liquid injection machine frame 14.

[0017] In this invention, reference is made to Figure 5 As shown, both the intelligent detection structure and the injection assembly are electrically connected to a closed-loop injection control system. The closed-loop injection control system performs closed-loop coordinated control as follows: Step 1, Parameter Presetting and Initial Data Acquisition: Preset the rated total volume of injection chamber 9 Coarse injection pre-set volume ratio Maximum rated static time Sampling time interval ; Obtain the initial liquid level data of each diaphragm-separated zone in injection chamber 9 at the moment of completion of coarse injection. Where i is the partition number separated by the diaphragm inside the injection chamber 9. where n is the total number of partitions; Step 2, Real-time data acquisition and immersion compliance closed-loop determination: according to the preset sampling time interval. Real-time liquid level data of each zone during the settling phase was collected. Based on initial liquid level data With real-time liquid level data The immersion compliance judgment value A is calculated using the immersion compliance judgment formula, which is as follows: In the formula, The average cross-sectional area of ​​each independent zone inside the injection chamber 9 is a preset parameter calculated based on the rated total volume and rated total height of the injection chamber 9. Step 3, Control Instruction Generation and Issuance: When the judgment value A reaches the preset immersion threshold B, or the settling time reaches... When the time is right, a secondary fine injection fluid control command is generated and sent to the injection component; when the judgment value A does not reach the immersion compliance threshold B, the real-time data acquisition and immersion compliance judgment process is continuously executed. By normalizing the liquid level data of multiple time zones, the degree of electrolyte wetting is quantitatively determined, replacing the qualitative determination of single-point liquid level in the existing technology, and solving the core problem of inaccurate determination of the wetting endpoint in the existing technology. At the same time, by calculating the average value of multiple zones, the interference of single-zone liquid level fluctuations on the determination results is eliminated, and the stability of closed-loop control is improved.

[0018] Specifically, the closed-loop liquid injection control system is integrated into the controller 19. The closed-loop liquid injection control system includes a liquid level acquisition unit, a servo positioning unit, a liquid injection linkage control unit, an immersion fitting unit, and an adaptive correction unit. The liquid level acquisition unit is electrically connected to the laser rangefinder 5, the servo positioning unit is electrically connected to the linear motor 3 and the telescopic motor 4, and the liquid injection linkage control unit is electrically connected to the air pump 18, the distribution valve 16, the telescopic cylinder 15, and the lifting seat 13. The data interaction and processing flow of each unit includes: Step 21, Data Interaction Verification: The servo positioning unit sends a positioning completion signal D to the liquid level acquisition unit. After receiving signal D, the liquid level acquisition unit activates the laser ranging sensor 5 to complete a single liquid level acquisition, generates an acquisition completion signal E, and sends it back to the servo positioning unit. Simultaneously, it transmits the acquired raw liquid level data to the immersion fitting unit. The verification matching formula between signal D and signal E is as follows: In the formula, The sequence encoding of the positioning completion signal sent by the servo positioning unit is automatically incremented after each positioning is completed; The sequence encoding of the acquisition completion signal returned by the liquid level acquisition unit is automatically incremented after each acquisition is completed; For the signal sequence check difference, when When the signal is deemed a valid match, the subsequent acquisition process is executed; when If this occurs, it is determined that the signal matching has failed, triggering the abnormal re-sampling process; Step 22, Data Processing and Transfer: After receiving the raw liquid level data, the wetting fitting unit completes the construction of the wetting model and the standard determination, generates the determination result data F and transmits it to the adaptive correction unit and the injection linkage control unit respectively; the adaptive correction unit generates the injection calibration parameters G based on the determination result data F and transmits them to the injection linkage control unit. Step 23, Command Execution and Feedback: Based on the judgment result data F and the injection calibration parameter G, the injection linkage control unit generates an injection execution command H and sends it to the corresponding execution component. At the same time, it receives the action feedback signal M from the execution component to complete the feedback verification of the closed-loop control. This section clarifies the hardware connection and data interaction logic of each unit in the closed-loop control system. By using a sequence coding verification formula, it achieves strict synchronization between positioning actions and liquid level acquisition, solving the problems of misaligned liquid level data acquisition and invalid data caused by asynchronous positioning and acquisition in existing technologies. At the same time, through a standardized data flow process, it ensures the logical coherence of the closed-loop control.

[0019] Specifically, the servo positioning unit is configured to: receive the diaphragm layout parameters inside the injection chamber 9, match the corresponding measurement window 12 position information based on the diaphragm layout parameters, generate the traversal positioning path of the laser range sensor 5 according to the measurement window 12 position information, and control the start, stop and displacement of the linear motor 3 and the telescopic motor 4 according to the traversal positioning path, so that the laser range sensor 5 sequentially aligns with each measurement window 12 to complete the liquid level data acquisition. The process of generating and controlling the traversal and positioning path includes: Step 31, Coordinate System Construction and Parameter Acquisition: Using the positioning reference angle of the clamping frame 8 as the origin, construct a Cartesian coordinate system O−XY for the device, where the X-axis is parallel to the movement direction of the linear motor 3, and the Y-axis is parallel to the movement direction of the telescopic motor 4; preset the initial coordinates of the laser rangefinder 5. X-axis transmission accuracy of linear motor 3 Y-axis transmission accuracy of telescopic motor 4 Obtain the center coordinates of each measuring window 12 within the injection chamber 9. ,in , where n is the total number of measuring windows; where O−XY is the plane rectangular coordinate system of the device, and the origin is the positioning reference angle of the clamping frame 8; These are the initial X-axis and Y-axis coordinates of the laser rangefinder 5; These are the coordinates of the center of the i-th measurement window 12 on the X and Y axes, respectively; Step 32, Shortest traversal path planning: Based on the center coordinates of each measurement window 12, the total length of the shortest traversal path is calculated using the improved ant colony algorithm path optimization formula. The formula is Where j is the sequence number of the measurement window adjacent to the i-th measurement window 12 in the traversal path, and the value is a positive integer; The path weights from the i-th measurement window 12 to the j-th measurement window 12 are preset based on the acceleration and deceleration characteristics of the motion axis; Step 33, Positioning Error Compensation and Motion Control: Based on the shortest traversal path, generate the number of motion control pulses for each axis. Simultaneously, compensate and correct the pulse count using the positioning error compensation formula. The compensated X-axis pulse count is... Y-axis pulse count The formula is , ;in, The center coordinates of the target measurement window 12; This represents the current real-time coordinates of laser rangefinder sensor 5. These are the historical average positioning errors for the X and Y axes, respectively, which are updated based on self-learning from historical positioning data. These are the compensated and corrected X-axis and Y-axis motion control pulse counts, respectively. Step 34, Positioning Completion Verification: After the laser rangefinder 5 moves to the target coordinates, the positioning verification is completed. After the verification is successful, a positioning completion signal is sent to the liquid level acquisition unit. By constructing a planar coordinate system and using the shortest path optimization formula, automatic traversal path planning for multiple measurement windows 12 is realized, replacing the fixed-point detection mode in the existing technology. It can automatically adapt to battery models with different diaphragm layouts without the need for manual adjustment of detection points, greatly improving the adaptability and detection efficiency of the equipment. At the same time, through the positioning error compensation formula, the influence of motor transmission error on positioning accuracy is eliminated, ensuring the precise alignment of the laser rangefinder 5 and the measurement window 12, and solving the problem of liquid level data acquisition distortion caused by positioning deviation in the existing technology.

[0020] Specifically, the wetting fitting unit is configured to: receive real-time liquid level data of multiple zones uploaded by the liquid level acquisition unit, construct a dynamic wetting model of electrolyte in injection chamber 9 based on the real-time liquid level data of multiple zones, fit the wetting rate of electrolyte in each zone through the dynamic wetting model, generate a static wetting threshold based on the wetting rate, and transmit the threshold to the injection linkage control unit. The process of constructing a dynamic infiltration model and fitting the infiltration rate includes: Step 41: Time-series dataset construction: Obtain the time-series liquid level dataset of the i-th partition during the settling phase. ,in For the k-th sampling time, m is the total number of samples; The liquid level height of the zone at the k-th sampling time; obtain the preset parameters of this zone, including the membrane porosity. kinematic viscosity of electrolyte Equivalent capillary radius of partition Contact angle between electrolyte and electrode ; Step 42: Wetting Rate Fitting and Dynamic Model Construction: Based on the Lucas-Washburn capillary wetting theory, the electrolyte wetting rate equation for this zone is obtained by fitting using the nonlinear least squares method, and a dynamic wetting model is constructed. The fitting formula is as follows: ; Based on the above fitting formula, the real-time infiltration rate vk of this partition is calculated, and the formula is as follows: ; Step 43: Generation of Immersion Threshold: Based on the immersion rate fitting results of each partition, calculate the average immersion rate of the entire partition. ,when Less than or equal to the preset infiltration rate critical value At that time, the threshold for achieving the infiltration standard is generated and transmitted to the injection linkage control unit; A dynamic electrolyte wetting model was constructed based on capillary wetting theory. The wetting rate of each zone was accurately quantified through a nonlinear fitting formula, replacing the existing technology that judges the wetting state solely by the change in liquid level. This model can accurately capture the wetting process of the electrolyte in the micropores of the electrode and separator, solving the problems of lag and misjudgment in the wetting state determination of the existing technology. At the same time, by dynamically generating the wetting threshold, it can be adapted to the wetting characteristics of different battery models, greatly improving the accuracy of wetting determination and providing a core basis for the precise control of subsequent secondary electrolyte injection.

[0021] Specifically, the adaptive correction unit is configured to: receive real-time liquid level data from multiple zones, calculate the liquid level difference between each zone, generate secondary injection calibration parameters based on the fitting results of the liquid level difference and the dynamic wetting model, and transmit the secondary injection calibration parameters to the injection linkage control unit; the injection linkage control unit adjusts the opening degree and opening / closing duration of the distribution valve 16 and the output pressure of the air pump 18 based on the secondary injection calibration parameters to complete the dynamic calibration of the secondary injection volume; The process for dynamic calibration and parameter control of secondary injection volume includes: Step 51, Parameter Acquisition and Liquid Level Difference Calculation: Obtain the final liquid level of each zone after settling. Rated internal volume of each zone The rated total liquid level height of injection chamber 9 Electrolyte volume temperature compensation coefficient Injection pressure loss coefficient Diaphragm wetting volume percentage ; Calculate the liquid level difference in each zone. Difference between volume and value The formula is , In the formula, Let i be the internal cross-sectional area of ​​the i-th partition; Step 52, Calculation and Zonal Allocation of Secondary Injection Volume: Based on the volume difference of each zone, the total injection volume of the secondary precision injection is calculated using a calibration formula. The formula is Based on the liquid level difference between each zone, the total injection volume is allocated to each zone, and the allocated injection volume for the i-th zone is... The formula is In the formula, This is the difference between the ambient temperature of the injection environment and the standard calibration temperature; Step 53, Injection Execution Parameter Adjustment: Based on Total Injection Volume Calculate the target opening and closing time of distribution valve 16. With the target output pressure of air pump 18 The formula is , In the formula, Here is the flow coefficient of distribution valve 16, and here are the factory calibration parameters of distribution valve 16; The differential pressure setting value for the injection process; Standard atmospheric pressure; This is the preset pressure loss value for the injection pipeline; Step 54, Parameter distribution and closed-loop verification: The calculated injection execution parameters are distributed to the injection linkage control unit. After the injection is completed, the final liquid level data is collected to complete the injection accuracy closed-loop verification. By calculating the volume difference between multiple zones and using the liquid injection volume calibration formula, dynamic and precise control of the secondary liquid injection volume is achieved, replacing the fixed liquid injection volume mode in the existing technology. This can adapt to the actual wetting loss of different individual batteries and solve the problem of excessive or insufficient liquid injection in the existing technology. At the same time, through temperature compensation and pressure loss compensation, the influence of environmental factors and pipeline losses on the liquid injection accuracy is eliminated, which greatly improves the uniformity and accuracy of electrolyte filling. In addition, through zoned liquid injection volume allocation, the electrolyte gap in each zone can be replenished in a targeted manner to ensure the uniformity of liquid level in each zone of the liquid injection chamber 9, further improving the consistency and electrochemical performance of the finished lithium battery.

[0022] Working principle: When this device is working, first power is supplied to all electrical equipment in the device, connect the liquid storage bottle 17 to the distribution valve 16, confirm that the distribution valve 16 is connected to the insertion interface of the lower telescopic end of the telescopic cylinder 15, clamp and fix the battery to be injected in the clamping frame 8, so that the battery injection chamber 9 and the battery cover 10 are sealed together.

[0023] The controller 19 synchronously starts the lifting seat 13 and the telescopic cylinder 15. The lifting seat 13 drives the clamping frame 8 to rise, and the telescopic cylinder 15 drives its lower end insertion interface to descend, so that the insertion interface is sealed and connected to the liquid injection port 11 on the battery cover 10. The controller 19 starts the air pump 18, which draws air from the liquid injection chamber 9. After the vacuum is completed, the air pump 18 switches to the working mode and injects high-pressure inert gas into the liquid storage bottle 17. The controller 19 opens the distribution valve 16, and the electrolyte in the liquid storage bottle 17 is injected into the liquid injection chamber 9 under the action of pressure difference. When the amount of electrolyte injected reaches the preset value, the controller 19 closes the distribution valve 16 and the air pump 18 to complete the coarse liquid injection process.

[0024] After the initial electrolyte injection is completed, the system enters a settling phase. The electrolyte in the injection chamber 9 wets the cell diaphragm and electrode plates through capillary effect. During the settling process, the controller 19 activates the linear motor 3 and telescopic motor 4 mounted on the metal mounting clamp 1. The metal mounting clamp 1 is fixed to the injection machine frame 14 by connecting bolts 2. The linear motor 3 drives the telescopic motor 4 to move horizontally, and the telescopic motor 4 drives the laser range sensor 5 to move in a direction perpendicular to the movement of the linear motor 3, so that the laser range sensor 5 is aligned with each measuring window 12 on the battery cover 10 in sequence. The laser range sensor 5 collects the liquid level data of each diaphragm-separated area in the injection chamber 9 through each measuring window 12 and transmits the liquid level data to the controller 19. The wires of the laser range sensor 5 move along the slider 7 on the metal mounting clamp 1 through the wire management sleeve 6 to avoid interference between the wires and the device components.

[0025] The controller 19 determines the electrolyte wetting state based on the received liquid level data. When the electrolyte wetting reaches the preset state, the controller 19 generates injection parameters based on the collected liquid level data, starts the air pump 18 and the distribution valve 16, and replenishes the electrolyte into the injection chamber 9 according to the generated injection parameters. After the electrolyte replenishment is completed, the controller 19 closes the distribution valve 16 and the air pump 18 to complete the fine injection process.

[0026] The controller 19 controls the lifting seat 13 to drive the clamping frame 8 to descend and reset, and controls the telescopic cylinder 15 to drive the insertion interface to rise and reset. The battery that has completed the electrolyte filling is removed from the clamping frame 8, and the electrolyte filling port 11 is sealed to complete the entire electrolyte filling process.

[0027] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An electrolyte filling device for lithium battery production, comprising a filling machine frame (14) horizontally mounted on the ground, wherein a filling component for completing the filling operation is installed on the filling machine frame (14), and a metal mounting clip (1) is installed on the lower part of the front end face of the filling machine frame (14), characterized in that: The metal mounting clip (1) is equipped with an intelligent detection structure for comprehensively detecting the liquid level height of the injection liquid; The intelligent detection structure and the injection component are both electrically connected to a closed-loop injection control system. The closed-loop injection control system is configured to: receive multi-zone liquid level data in the injection chamber (9) collected by the intelligent detection structure, generate injection control instructions based on the multi-zone liquid level data, and send the injection control instructions to the injection component.

2. The electrolyte filling device for lithium battery production according to claim 1, characterized in that: The intelligent detection structure includes connecting bolts (2) inserted into the through holes on both sides of the metal mounting clip (1). The connecting bolts (2) are screwed and fixed on the liquid injection machine frame (14). The metal mounting clip (1) is clamped and fixed on the liquid injection machine frame (14) by the connecting bolts (2).

3. The electrolyte filling device for lithium battery production according to claim 2, characterized in that: A linear motor (3) is horizontally mounted on the front end face of the metal mounting clip (1). A telescopic motor (4) is fixedly mounted on the sliding seat of the linear motor (3). The telescopic motor (4) is located below the metal mounting clip (1) and is arranged in a vertically intersecting position.

4. The electrolyte filling device for lithium battery production according to claim 3, characterized in that: A laser rangefinder sensor (5) is installed at the telescopic end of the telescopic motor (4). The detection port of the laser rangefinder sensor (5) is vertically downward. The upper wire of the laser rangefinder sensor (5) is vertically bent and extends forward and passes through the metal mounting clip (1). A cable management sleeve (6) is sleeved at the point where the upper wire of the laser rangefinder sensor (5) passes through the metal mounting clip (1). The cable management sleeve (6) is horizontally slidably connected in the slide bar (7) opened on the metal mounting clip (1).

5. The electrolyte filling device for lithium battery production according to claim 1, characterized in that: The liquid injection assembly includes a clamping frame (8) located below the metal mounting clip (1). Multiple liquid injection chambers (9) are clamped and fixed at equal intervals inside the clamping frame (8). A battery cover (10) is sealed and fixed to the top surface of each liquid injection chamber (9). A liquid injection port (11) is opened on one side of the top surface of the battery cover (10). Multiple measuring windows (12) are opened on the other side of the top surface of the battery cover (10) in accordance with the position of the diaphragm inside the liquid injection chamber (9).

6. The electrolyte filling device for lithium battery production according to claim 5, characterized in that: The bottom surface of the clamping frame (8) is equipped with a lifting seat (13) through a metal frame. The lifting seat (13) is installed on the top front end of the liquid injection machine frame (14). Multiple vertically arranged telescopic cylinders (15) are installed above the metal mounting clamp (1) on the front end of the liquid injection machine frame (14). The telescopic ends of the telescopic cylinders (15) are all connected to a distribution valve (16) at the top. Each distribution valve (16) is connected to a storage bottle (17). The distribution valve (16) is installed on the liquid injection machine frame (14). An air pump (18) is installed on one side of the liquid injection machine frame (14), and a controller (19) is installed on the other end of the liquid injection machine frame (14).

7. The electrolyte filling device for lithium battery production according to claim 1, characterized in that: The closed-loop liquid injection control system is integrated in the controller (19). The closed-loop liquid injection control system includes a liquid level acquisition unit, a servo positioning unit, a liquid injection linkage control unit, an immersion fitting unit, and an adaptive correction unit. The liquid level acquisition unit is electrically connected to the laser range sensor (5). The servo positioning unit is electrically connected to the linear motor (3) and the telescopic motor (4) respectively. The liquid injection linkage control unit is electrically connected to the air pump (18), the distribution valve (16), the telescopic cylinder (15), and the lifting seat (13) respectively.

8. The electrolyte filling device for lithium battery production according to claim 7, characterized in that: The servo positioning unit is configured to: receive the diaphragm layout parameters inside the injection chamber (9), match the position information of the corresponding measurement window (12) based on the diaphragm layout parameters, generate the traversal positioning path of the laser range sensor (5) according to the position information of the measurement window (12), and control the start, stop and displacement of the linear motor (3) and the telescopic motor (4) according to the traversal positioning path, so that the laser range sensor (5) sequentially aligns with each measurement window (12) to complete the liquid level data acquisition.

9. The electrolyte filling device for lithium battery production according to claim 7, characterized in that: The immersion fitting unit is configured to: receive real-time liquid level data of multiple zones uploaded by the liquid level acquisition unit, construct a dynamic immersion model of electrolyte in the injection chamber (9) based on the real-time liquid level data of multiple zones, fit the immersion rate of electrolyte in each zone through the dynamic immersion model, generate a static immersion threshold based on the immersion rate, and transmit the threshold to the injection linkage control unit.

10. The electrolyte filling device for lithium battery production according to claim 7, characterized in that: The adaptive correction unit is configured to: receive real-time liquid level data of multiple zones, calculate the liquid level difference of each zone, generate secondary injection calibration parameters based on the fitting result of the liquid level difference and the dynamic immersion model, and transmit the secondary injection calibration parameters to the injection linkage control unit. The liquid injection linkage control unit adjusts the opening degree and opening and closing time of the distribution valve (16) and the output pressure of the air pump (18) based on the secondary liquid injection calibration parameters to complete the dynamic calibration of the secondary liquid injection volume.

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