A lithium ion battery liquid injection system and a liquid injection control method thereof

Abstract

The application discloses a kind of lithium ion battery liquid injection system and its liquid injection control method, lithium ion battery liquid injection system includes controller, respectively with the lifting type liquid injection cavity of controller, liquid injection carousel, feeding conveyor line, qualified product discharge conveyor line and defective product discharge conveyor line;Lifting type liquid injection cavity is located in the direct upper of liquid injection carousel, liquid injection carousel is built-in with multiple battery positioning cavities, corresponding weighing lifting platform is set in each battery positioning cavity, feeding conveyor line is communicated with one of multiple battery positioning cavities, and qualified product discharge conveyor line and defective product discharge conveyor line are arranged in parallel and are communicated with another battery positioning cavity in multiple battery positioning cavities.The application makes that liquid injection and weighing are carried out simultaneously, and real-time accurately monitor to liquid injection process, improve the efficiency of liquid injection.

Description

Technical Field

[0001] This invention relates to the field of lithium-ion battery electrolyte filling technology, specifically a lithium-ion battery electrolyte filling system and its electrolyte filling control method. Background Technology

[0002] In the production process of lithium-ion batteries, the electrolyte filling process is a crucial step. The electrolyte filling not only affects the subsequent electrochemical performance of the lithium-ion battery but also the effective control of overall production costs. A precise and efficient electrolyte filling process can ensure excellent electrochemical performance of the lithium-ion battery while saving time, improving production efficiency, and reducing costs.

[0003] Traditional lithium-ion battery electrolyte filling systems often employ a linear loading and unloading method. After filling, the lithium batteries need to enter a weighing system to determine the amount of electrolyte injected, which is not conducive to improving filling efficiency and increases additional costs. Linear lithium-ion battery electrolyte filling systems occupy a large area, resulting in low plant space utilization. Furthermore, in traditional lithium-ion battery electrolyte filling systems, good and defective batteries are located on the same floor. In actual operation, defective batteries can interfere with the flow of qualified batteries, which is detrimental to process error prevention. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a lithium-ion battery liquid injection system and a liquid injection control method thereof, which enables liquid injection and weighing to be carried out simultaneously and to monitor the liquid injection process in real time and accurately, thereby improving the efficiency of liquid injection.

[0005] The technical solution of this invention is as follows:

[0006] A lithium-ion battery electrolyte filling system includes a controller, a lifting electrolyte filling chamber, an electrolyte filling turntable, a feeding conveyor line, a qualified product unloading conveyor line, and a defective product unloading conveyor line, all connected to the controller. The lifting electrolyte filling chamber is located directly above the electrolyte filling turntable, which has multiple battery positioning chambers. Each battery positioning chamber is equipped with a corresponding weighing lifting platform. The feeding conveyor line is connected to one of the battery positioning chambers. The qualified product unloading conveyor line and the defective product unloading conveyor line are arranged parallel to each other and are each connected to another battery positioning chamber.

[0007] The weighing lifting platform includes a lifting platform body and a weighing sensor installed on the lifting platform body. The weighing sensor and the lifting drive mechanism of the lifting platform body are both connected to the controller.

[0008] The liquid injection turntable includes a rotary drive mechanism connected to the controller and a rotary cavity connected to the rotary drive mechanism. The interior of the rotary cavity is divided into multiple battery positioning cavities along the circumferential direction.

[0009] The rotating cavity includes an annular sealing plate and multiple vertical partitions. The annular sealing plate is vertically arranged, and the multiple vertical partitions are evenly distributed along the outer periphery of the annular sealing plate and fixedly connected to the outer wall of the annular sealing plate. A battery positioning cavity is formed between two adjacent vertical partitions. The upper part of each battery positioning cavity is an upper cavity, and the lower part of each battery positioning cavity is a lower cavity. Each vertical partition is provided with a battery positioning sensor facing the upper cavity of the corresponding battery positioning cavity. The battery positioning sensor is connected to the controller.

[0010] The feeding conveyor line is located on the outer periphery of the rotating cavity. The discharge end of the feeding conveyor line is connected to the upper cavity of one of the battery positioning cavities. A barcode scanner is installed on the side of the discharge end of the feeding conveyor line. A lifting feeding baffle and a feeding counter are installed at the discharge end of the feeding conveyor line. Each weighing lifting platform is equipped with an inlet and outlet conveyor line. The barcode scanner, the lifting feeding baffle, the feeding counter, and the inlet and outlet conveyor lines are all connected to the controller.

[0011] Both the qualified product unloading conveyor line and the defective product unloading conveyor line are located on the outer periphery of the rotating cavity. The inlet end of the qualified product unloading conveyor line and the outlet end of the loading conveyor line are respectively connected to the upper cavity of the two adjacent battery positioning cavities. The inlet end of the defective product unloading conveyor line is connected to the lower cavity of the corresponding battery positioning cavity. Both the qualified product unloading conveyor line and the defective product unloading conveyor line are equipped with lifting unloading baffles connected to the controller at their outlet ends.

[0012] In the multiple battery positioning cavities, one battery positioning cavity is designated as battery positioning cavity #1, and the other battery positioning cavities are designated as battery positioning cavities #2 to #n, where n is an integer greater than 2. The bottom end of the weighing lifting platform in battery positioning cavity #1 is provided with a downwardly extending positioning baffle. A through-beam photoelectric sensor connected to the controller is provided at the unloading position on the outer periphery of the rotating cavity. The transmitting sensor and receiving sensor of the through-beam photoelectric sensor are respectively located on the outer periphery of the outer ring of the rotating cavity and in the inner ring of the rotating cavity, and both face the lower cavity of the battery positioning cavity. The transmitting sensor is aligned with the horizontal orientation of the feed end of the qualified product unloading conveyor line.

[0013] The lifting-type injection chamber includes an injection lifting drive mechanism, a cover with an open bottom, a ring of vertically downward-extending injection nozzles, and a solenoid valve and pressure sensor installed on each injection nozzle. The cover is connected to the injection lifting drive mechanism, and the ring of injection nozzles is fixed inside the cover and corresponds one-to-one with the multiple battery positioning cavities of the injection turntable. The injection lifting drive mechanism, the solenoid valve on each injection nozzle, and the pressure sensor are all connected to the controller.

[0014] A method for controlling the electrolyte injection of a lithium-ion battery system, specifically including the following steps:

[0015] (1) Self-test mode: All weighing lifting platforms in the liquid injection turntable are moved up to the upper cavity of the battery positioning cavity and it is confirmed that there are no lithium batteries in any battery positioning cavity.

[0016] (2) Feeding mode: The controller drives the liquid injection turntable to rotate, so that the upper cavity of one of the battery positioning chambers is connected to the discharge end of the feeding conveyor line. Then, a lithium battery on the feeding conveyor line is transported to the weighing lifting platform of the battery positioning chamber. Then, the above steps are repeated until each weighing lifting platform in the liquid injection turntable is equipped with a lithium battery.

[0017] (3) Liquid injection mode: The controller controls the lifting liquid injection chamber to move down, and the liquid injection nozzle on the lifting liquid injection chamber is connected to the liquid injection port on the lithium battery in the liquid injection turntable one by one. The solenoid valve is opened to perform liquid injection operation. During liquid injection, each weighing lifting platform collects the change value of the lithium battery weight in real time. When the collected liquid injection amount reaches the set liquid injection weight, the controller controls the corresponding solenoid valve to close and stop liquid injection. When the liquid injection time reaches the set liquid injection time, all solenoid valves are closed to stop liquid injection, and the controller controls the lifting liquid injection chamber to move up and reset.

[0018] (4) Feeding mode: After the liquid injection is completed, the controller determines whether the liquid injection is qualified based on the actual liquid injection amount of each lithium battery. If the liquid injection amount reaches the set liquid injection weight, the liquid injection is qualified. The lithium batteries in the battery positioning cavity that have qualified liquid injection are directly transported to the qualified product unloading conveyor line for output. If the liquid injection amount does not reach the set liquid injection weight, the liquid injection is unqualified. The controller drives the weighing lifting platform in the battery positioning cavity to move down. The lithium batteries in the battery positioning cavity that have unqualified liquid injection are transported to the defective product unloading conveyor line for output.

[0019] (5) Loading and unloading linkage cycle mode: When the lithium battery in a certain battery positioning cavity is unloaded, the controller drives the liquid injection turntable to rotate, and connects the battery positioning cavity with the loading conveyor line. The other battery positioning cavity adjacent to this battery positioning cavity is connected with the qualified product unloading conveyor line. This battery positioning cavity performs the loading mode operation according to step (2), and the other adjacent battery positioning cavity performs the unloading mode operation according to step (4). All battery positioning cavities perform loading and unloading synchronous operation in this way until all battery positioning cavities have completed the loading operation. Then the controller controls the loading conveyor line, qualified product unloading conveyor line and defective product unloading conveyor line to stop running, and then performs the liquid injection mode operation. After the liquid injection mode is completed, the next loading and unloading linkage cycle mode is entered.

[0020] (6) Cleaning mode: The manual operation controller sends the end production command. After the lithium-ion battery liquid injection system completes the last loading and unloading linkage cycle mode, it executes the self-test mode. After the self-test mode ends, the lithium-ion battery liquid injection system stops operating.

[0021] Before the liquid injection mode, if no lithium battery positioning signal is detected in a certain battery positioning cavity or the weighing lifting platform in a certain battery positioning cavity does not detect the weighing weight, the controller determines that there is an abnormal feeding situation in this battery positioning cavity and controls it to the liquid injection prohibition mode. That is, during liquid injection, the solenoid valve of the liquid injection nozzle connected to the lithium battery in this battery positioning cavity is always in the closed state. In the feeding mode, if three consecutive battery positioning cavities have abnormal feeding situations, the controller will issue an alarm reminder and stop feeding and the operation of subsequent modes.

[0022] Advantages of this invention:

[0023] (1) The weighing lifting platform for positioning lithium batteries in this invention is equipped with a weighing sensor to weigh the lithium batteries before and after liquid injection, thereby enabling real-time and accurate monitoring of the liquid injection volume and improving the efficiency of liquid injection.

[0024] (2) The liquid injection turntable of the present invention can be customized in size according to the production scale and the specifications of lithium batteries, which ensures high liquid injection efficiency and improves the utilization rate of the factory area, and can meet the liquid injection needs of lithium batteries of different specifications.

[0025] (3) The liquid injection turntable of the present invention adopts a disc structure, which can realize the linkage and circulation control of loading and unloading, greatly improving the efficiency of liquid injection.

[0026] (4) The present invention is equipped with a qualified product unloading conveyor line and a defective product unloading conveyor line, as well as a weighing and lifting platform that works in conjunction with the two. This enables the layered transfer of qualified and defective batteries, improves space utilization, and effectively reduces the risk of defective batteries interfering with the transfer of qualified batteries. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the lithium-ion battery electrolyte injection system of the present invention.

[0028] Figure 2 This is a top view of the injection rotary table of the present invention.

[0029] Figure 3 This is a schematic diagram of the lithium-ion battery liquid injection system of the present invention under liquid injection conditions.

[0030] Figure 4 This is a schematic diagram of the lithium-ion battery electrolyte filling system of the present invention.

[0031] Reference numerals: 1-Liquid injection lifting drive mechanism, 2-Lifting liquid injection chamber cover, 3-Liquid injection nozzle, 4-Solenoid valve, 5-Pressure sensor, 6-Rotary drive mechanism, 7-Annular sealing plate, 8-Vertical partition, 9-Battery positioning sensor, 10-Lifting platform body, 11-Weighing sensor, 12-Infeed / outfeed conveyor line, 13-Positioning baffle, 14-Through-beam photoelectric sensor, 15-Feeding conveyor line, 16-Qualified product unloading conveyor line, 17-Defective product unloading conveyor line, 18-Bar scanner, 19-Lifting feeding baffle, 20-Feeding counter, 21-Lifting unloading baffle, 22-Controller. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] See Figures 1-4 A lithium-ion battery liquid injection system includes a controller 22, a lifting liquid injection chamber, a liquid injection turntable, a feeding conveyor line 15, a qualified product unloading conveyor line 16, and a defective product unloading conveyor line 17.

[0034] The lifting injection chamber is located directly above the injection turntable. The lifting injection chamber includes an injection lifting drive mechanism 1, a cover 2 with an open bottom, a ring of injection nozzles extending vertically downwards, and a solenoid valve 4 and a pressure sensor 5 installed on each injection nozzle 3. The cover 2 is connected to the injection lifting drive mechanism 1, the ring of injection nozzles 3 is fixed inside the cover 2, and the inlet at the top of the cover 2 is connected to the electrolyte storage tank.

[0035] The liquid injection turntable includes a rotary drive mechanism 6, a rotary cavity connected to the rotary drive mechanism 6, and multiple weighing lifting platforms. The rotary cavity includes an annular sealing plate 7 and sixteen vertical partitions 8. The annular sealing plate 7 is vertically arranged, and the sixteen vertical partitions 8 are evenly distributed along the outer periphery of the annular sealing plate 7 and fixedly connected to the outer wall of the annular sealing plate 7. A battery positioning cavity is formed between two adjacent vertical partitions 8. A ring of liquid injection nozzles 2 corresponds one-to-one with the sixteen battery positioning cavities. The upper part of each battery positioning cavity is the upper cavity, and the lower part of each battery positioning cavity is the lower cavity. Each vertical partition 8 is provided with a battery positioning sensor 9 facing the upper cavity of the corresponding battery positioning cavity. Each battery positioning cavity is provided with a corresponding weighing lifting platform. The weighing lifting platform includes a lifting platform body 10, a weighing sensor 11 set on the lifting platform body 10, and an infeed / outfeed conveyor line 12.

[0036] Among the sixteen battery positioning cavities, one battery positioning cavity is designated as battery #1, and the other battery positioning cavities are designated as battery #2 to #16. A downwardly extending positioning baffle 13 is provided at the bottom of the weighing lifting platform inside battery #1. A through-beam photoelectric sensor 14 is provided at the unloading position on the outer periphery of the rotating cavity. The transmitting and receiving sensors of the through-beam photoelectric sensor 14 are respectively located on the outer periphery of the outer ring of the rotating cavity and in the inner ring of the rotating cavity, both facing the lower cavity of the battery positioning cavity. The transmitting sensor 14 is aligned with the horizontal orientation of the feeding end of the qualified product unloading conveyor line 16. When the upper cavity of battery #1 is connected to the qualified product unloading conveyor line 16 and the lower cavity of battery #1 is connected to the defective product unloading conveyor line 17, the positioning baffle 13 is located between the transmitting and receiving sensors of the through-beam photoelectric sensor 14.

[0037] The feeding conveyor line 15, the qualified product unloading conveyor line 16, and the defective product unloading conveyor line 17 are all located on the outer periphery of the rotating cavity. A barcode scanner 18 is provided on the side of the discharge end of the feeding conveyor line 15. The qualified product unloading conveyor line 16 is located on the horizontal side of the feeding conveyor line 15. The qualified product unloading conveyor line 16 and the defective product unloading conveyor line 17 are arranged in parallel vertically. The feeding end of the qualified product unloading conveyor line 16 and the discharge end of the feeding conveyor line 15 are respectively connected to the upper cavity of two adjacent battery positioning cavities. The feeding end of the defective product unloading conveyor line 17 is connected to the lower cavity of the corresponding battery positioning cavity. The discharge end of the feeding conveyor line 15 is provided with a lifting feeding baffle 19 and a feeding counter 20. The discharge ends of the qualified product unloading conveyor line 16 and the defective product unloading conveyor line 17 are both provided with lifting feeding baffles 21.

[0038] The liquid injection lifting drive mechanism 1 of the lifting liquid injection chamber, the solenoid valve 4 and pressure sensor 5 on each liquid injection nozzle 2, the rotation drive mechanism 6 of the liquid injection turntable and sixteen battery positioning sensors 9, the lifting drive mechanism of the sixteen lifting platform bodies 10, the weighing sensor 11 and the inlet and outlet conveyor line 12, the through-beam photoelectric sensor 14, the drive mechanism of the loading conveyor line 15, the drive mechanism of the qualified product unloading conveyor line 16, the drive mechanism of the defective product unloading conveyor line 17, the barcode scanner 18, the lifting loading baffle 19, the loading counter 20, and the lifting unloading baffle 21 are all connected to the controller 22.

[0039] A method for controlling the electrolyte injection of a lithium-ion battery system, specifically including the following steps:

[0040] (1) Self-inspection mode: When the weighing lifting platform in all battery positioning cavities of the liquid injection turntable moves up to the upper cavity of the battery positioning cavity, and the sixteen battery positioning sensors 9 detect that there are no lithium batteries in the upper cavity of all battery positioning cavities, the controller 22 controls the rotating cavity to rotate until the through-beam photoelectric sensor 14 is blocked by the positioning baffle 13, that is, the upper cavity of the No. 1 battery positioning cavity is connected to the qualified product unloading conveyor line 16, and the lower cavity of the No. 1 battery positioning cavity is connected to the defective product unloading conveyor line 17. At this time, the self-inspection mode is completed.

[0041] (2) Feeding Mode: After completing the self-test mode, the controller 22 drives the rotating cavity to rotate by a set angle, so that the upper cavity of the No. 1 battery positioning cavity is connected to the discharge end of the feeding conveyor line 15. At the same time, the feeding counter 20 detects that there is a lithium battery at the discharge end of the feeding conveyor line 15. The barcode scanner 18 scans the lithium battery and the tray and uploads the data to the controller 22. Then, the controller 22 controls the lifting feeding baffle 19 to descend, remove the obstruction, and starts the inlet and outlet conveyor line 12 on the weighing lifting platform in the No. 1 battery positioning cavity to feed the first lithium battery to the weighing lifting platform of the No. 1 battery positioning cavity. When the feeding counter 20 detects the second lithium battery, it moves the lifting feeding baffle 19 up to reset, preventing the second lithium battery from entering the weighing lifting platform of the No. 1 battery positioning cavity. At this time, the battery positioning sensor 9 in the No. 1 battery positioning cavity detects the lithium battery positioning signal. The weighing sensor 11 on the weighing lifting platform weighs the battery before liquid injection and records the pre-injection weighing. The data is transmitted to the controller 22 for storage. After the #1 battery positioning cavity is filled, the controller 22 drives the rotating cavity to rotate again by a set angle, so that each battery positioning cavity is connected to the feeding conveyor line 15 in sequence, and the lithium battery filling of all battery positioning cavities is completed according to the above steps. When the rotating cavity rotates to the point where the through-beam photoelectric sensor 14 is blocked by the positioning baffle 13 again, the feeding mode is completed. Before the liquid injection mode, if the battery positioning sensor 9 in a battery positioning cavity does not detect the lithium battery positioning signal, the barcode scanner 18 scans abnormally when the lithium battery in a battery positioning cavity is filled, or the weighing sensor 11 in a battery positioning cavity does not detect the weighing weight, the controller 22 determines that the battery positioning cavity has a feeding abnormality and controls it to the liquid injection prohibition mode. That is, when liquid is injected, the solenoid valve of the liquid injection nozzle connected to the lithium battery in this battery positioning cavity is always in the closed state. In the feeding mode, when three battery positioning cavities have feeding abnormalities in a row, the controller 22 will issue an alarm reminder and stop feeding and subsequent mode operation.

[0042] (3) Liquid injection mode: After the feeding mode is completed, the controller 22 controls the lifting liquid injection chamber to move down. The liquid injection nozzle 3 on the lifting liquid injection chamber is connected to the liquid injection port on the lithium battery in the rotating chamber one by one. The pressure sensor 5 on the liquid injection nozzle determines whether the liquid injection nozzle is accurately pressed onto the liquid injection port. When the connection is completed, the solenoid valve 4 on the corresponding liquid injection nozzle 3 of the battery positioning chamber that is determined to be in the liquid injection mode is closed. All other solenoid valves 4 are opened to carry out the liquid injection operation. During liquid injection, the weighing sensor 11 on each weighing lifting platform collects the change value of the lithium battery weight in real time. When the liquid injection amount collected by the weighing sensor 11 reaches the set liquid injection weight, the controller 22 controls the corresponding solenoid valve 4 to close and stop the liquid injection. When the liquid injection time reaches the set liquid injection time, all solenoid valves 4 are closed and the liquid injection is stopped. The controller 22 controls the lifting liquid injection chamber to move up and reset.

[0043] (4) Feeding Mode: After the liquid injection is completed, the controller 22 determines whether the liquid injection is qualified based on the actual liquid injection amount of each lithium battery. If the liquid injection amount reaches the set liquid injection weight, the liquid injection is qualified; if the liquid injection amount does not reach the set liquid injection weight, the liquid injection is unqualified. When the lithium battery in a battery positioning cavity is qualified for liquid injection, and the upper cavity of this battery positioning cavity is connected to the qualified product feeding conveyor line 16 and the lower cavity is connected to the defective product feeding conveyor line 17, the controller 22 directly moves the lifting feeding baffle 21 at the discharge end 16 of the qualified product feeding conveyor line downwards, and then starts the inlet and outlet conveyor line 12 on the weighing lifting platform in this battery positioning cavity. The discharge conveyor transports the lithium batteries in the battery positioning cavity to the qualified product unloading conveyor line 16 for output. When the lithium battery in a battery positioning cavity fails to meet the liquid filling requirements, and the upper cavity of the battery positioning cavity is connected to the qualified product unloading conveyor line 16 and the lower cavity is connected to the defective product unloading conveyor line 17, the controller 22 drives the weighing lifting platform to move down, and at the same time moves the lifting unloading baffle 21 at the discharge end of the defective product unloading conveyor line 17 down. Then, the inlet and outlet conveyor line 12 on the weighing lifting platform in the battery positioning cavity is started for discharge conveying, and the lithium batteries in the battery positioning cavity are transported to the defective product unloading conveyor line 17 for output.

[0044] (5) Loading and unloading linkage cycle mode: After the lithium battery in the No. 1 battery positioning cavity is unloaded, the controller 22 drives the rotating cavity to rotate by a set angle. At this time, the No. 1 battery positioning cavity is connected to the loading conveyor line 15. The upper cavity of the No. 2 battery positioning cavity adjacent to the No. 1 battery positioning cavity is connected to the qualified product unloading conveyor line 16 and the lower cavity is connected to the defective product unloading conveyor line 17. The No. 1 battery positioning cavity performs the loading mode operation according to step (2), and the No. 2 battery positioning cavity performs the unloading mode operation according to step (4). After all subsequent battery positioning cavities are rotated, the loading and unloading synchronous operation is performed in this way until all battery positioning cavities have completed the loading operation. At this time, the through-beam photoelectric sensor 14 is blocked by the positioning baffle 13 again. The controller 22 controls the loading conveyor line 15, the qualified product unloading conveyor line 16 and the defective product unloading conveyor line 17 to stop running. Then the controller 22 controls the lithium-ion battery liquid injection system to enter the liquid injection mode again. After the liquid injection mode is completed, the next loading and unloading linkage cycle mode is entered.

[0045] (6) Cleaning mode: Manually operate the controller 22 to send the end production command. After the lithium-ion battery liquid injection system completes the last loading and unloading linkage cycle mode, it executes the self-test mode. After the self-test mode ends, the lithium-ion battery liquid injection system stops operating.

[0046] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lithium-ion battery electrolyte filling system, characterized in that: The device includes a controller, a lifting injection chamber, an injection turntable, a feeding conveyor line, a qualified product unloading conveyor line, and a defective product unloading conveyor line, all connected to the controller. The lifting injection chamber is located directly above the injection turntable, which contains multiple battery positioning chambers. Each battery positioning chamber is equipped with a corresponding weighing lifting platform. The feeding conveyor line is connected to one of the multiple battery positioning chambers. The qualified product unloading conveyor line and the defective product unloading conveyor line are arranged parallel to each other and are each connected to another battery positioning chamber. The weighing lifting platform includes a lifting platform body and a weighing sensor installed on the lifting platform body. The weighing sensor and the lifting drive mechanism of the lifting platform body are both connected to the controller. The liquid injection turntable includes a rotary drive mechanism connected to the controller and a rotary cavity connected to the rotary drive mechanism. The interior of the rotary cavity is divided into multiple battery positioning cavities along the circumferential direction.

2. The lithium-ion battery electrolyte filling system according to claim 1, characterized in that: The rotating cavity includes an annular sealing plate and multiple vertical partitions. The annular sealing plate is vertically arranged, and the multiple vertical partitions are evenly distributed along the outer periphery of the annular sealing plate and fixedly connected to the outer wall of the annular sealing plate. A battery positioning cavity is formed between two adjacent vertical partitions. The upper part of each battery positioning cavity is an upper cavity, and the lower part of each battery positioning cavity is a lower cavity. Each vertical partition is provided with a battery positioning sensor facing the upper cavity of the corresponding battery positioning cavity. The battery positioning sensor is connected to the controller.

3. A lithium-ion battery electrolyte filling system according to claim 2, characterized in that: The feeding conveyor line is located on the outer periphery of the rotating cavity. The discharge end of the feeding conveyor line is connected to the upper cavity of one of the battery positioning cavities. A barcode scanner is installed on the side of the discharge end of the feeding conveyor line. A lifting feeding baffle and a feeding counter are installed at the discharge end of the feeding conveyor line. Each weighing lifting platform is equipped with an inlet and outlet conveyor line. The barcode scanner, the lifting feeding baffle, the feeding counter, and the inlet and outlet conveyor lines are all connected to the controller.

4. A lithium-ion battery electrolyte filling system according to claim 3, characterized in that: Both the qualified product unloading conveyor line and the defective product unloading conveyor line are located on the outer periphery of the rotating cavity. The inlet end of the qualified product unloading conveyor line and the outlet end of the loading conveyor line are respectively connected to the upper cavity of the two adjacent battery positioning cavities. The inlet end of the defective product unloading conveyor line is connected to the lower cavity of the corresponding battery positioning cavity. Both the qualified product unloading conveyor line and the defective product unloading conveyor line are equipped with lifting unloading baffles connected to the controller at their outlet ends.

5. A lithium-ion battery electrolyte filling system according to claim 4, characterized in that: In the multiple battery positioning cavities, one battery positioning cavity is designated as battery positioning cavity #1, and the other battery positioning cavities are designated as battery positioning cavities #2 to #n, where n is an integer greater than 2. The bottom end of the weighing lifting platform in battery positioning cavity #1 is provided with a downwardly extending positioning baffle. A through-beam photoelectric sensor connected to the controller is provided at the unloading position on the outer periphery of the rotating cavity. The transmitting sensor and receiving sensor of the through-beam photoelectric sensor are respectively located on the outer periphery of the outer ring of the rotating cavity and in the inner ring of the rotating cavity, and both face the lower cavity of the battery positioning cavity. The transmitting sensor is aligned with the horizontal orientation of the feed end of the qualified product unloading conveyor line.

6. A lithium-ion battery electrolyte filling system according to claim 1, characterized in that: The lifting-type injection chamber includes an injection lifting drive mechanism, a cover with an open bottom, a ring of vertically downward-extending injection nozzles, and a solenoid valve and pressure sensor installed on each injection nozzle. The cover is connected to the injection lifting drive mechanism, and the ring of injection nozzles is fixed inside the cover and corresponds one-to-one with the multiple battery positioning cavities of the injection turntable. The injection lifting drive mechanism, the solenoid valve on each injection nozzle, and the pressure sensor are all connected to the controller.

7. A method for controlling the electrolyte injection of a lithium-ion battery using any one of claims 1 to 6, characterized in that: Specifically, it includes the following steps: (1) Self-inspection mode: All weighing lifting platforms in the liquid injection turntable are moved up to the upper cavity of the battery positioning cavity and it is confirmed that there are no lithium batteries in any battery positioning cavity. (2) Feeding mode: The controller drives the liquid injection turntable to rotate, so that the upper cavity of one of the battery positioning chambers is connected to the discharge end of the feeding conveyor line. Then, a lithium battery on the feeding conveyor line is transported to the weighing lifting platform of the battery positioning chamber. Then, the above steps are repeated until each weighing lifting platform in the liquid injection turntable is equipped with a lithium battery. (3) Liquid injection mode: The controller controls the lifting liquid injection chamber to move down, and the liquid injection nozzle on the lifting liquid injection chamber is connected to the liquid injection port on the lithium battery in the liquid injection turntable one by one. The solenoid valve is opened to perform liquid injection operation. During liquid injection, each weighing lifting platform collects the change value of the lithium battery weight in real time. When the collected liquid injection amount reaches the set liquid injection weight, the controller controls the corresponding solenoid valve to close and stop liquid injection. When the liquid injection time reaches the set liquid injection time, all solenoid valves are closed to stop liquid injection, and the controller controls the lifting liquid injection chamber to move up and reset. (4) Feeding mode: After the liquid injection is completed, the controller determines whether the liquid injection is qualified based on the actual liquid injection amount of each lithium battery. If the liquid injection amount reaches the set liquid injection weight, the liquid injection is qualified. The lithium batteries in the positioning cavity that have qualified liquid injection are directly transported to the qualified product unloading conveyor line for output. If the liquid injection amount does not reach the set liquid injection weight, the liquid injection is unqualified. The controller drives the weighing lifting platform in the positioning cavity of the battery to move down. The lithium batteries in the positioning cavity that have unqualified liquid injection are transported to the defective product unloading conveyor line for output. (5) Loading and unloading linkage cycle mode: When the lithium battery in a certain battery positioning cavity is unloaded, the controller drives the liquid injection turntable to rotate, and connects the battery positioning cavity with the loading conveyor line. The other battery positioning cavity adjacent to this battery positioning cavity is connected with the qualified product unloading conveyor line. This battery positioning cavity performs the loading mode operation according to step (2), and the other adjacent battery positioning cavity performs the unloading mode operation according to step (4). All battery positioning cavities perform loading and unloading synchronous operation in this way until all battery positioning cavities have completed the loading operation. Then the controller controls the loading conveyor line, qualified product unloading conveyor line and defective product unloading conveyor line to stop running, and then performs the liquid injection mode operation. After the liquid injection mode is completed, the next loading and unloading linkage cycle mode is entered. (6) Cleaning mode: The manual operation controller sends the end production command. After the lithium-ion battery liquid injection system completes the last loading and unloading linkage cycle mode, it executes the self-test mode. After the self-test mode ends, the lithium-ion battery liquid injection system stops operating.

8. The injection control method according to claim 7, characterized in that: Before the liquid injection mode, if no lithium battery positioning signal is detected in a certain battery positioning cavity or the weighing lifting platform in a certain battery positioning cavity does not detect the weighing weight, the controller determines that there is an abnormal feeding situation in this battery positioning cavity and controls it to the liquid injection prohibition mode. That is, during liquid injection, the solenoid valve of the liquid injection nozzle connected to the lithium battery in this battery positioning cavity is always in the closed state. In the feeding mode, if three consecutive battery positioning cavities have abnormal feeding situations, the controller will issue an alarm reminder and stop feeding and the operation of subsequent modes.

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