A cylindrical lithium battery electrolyte filling device and method

Abstract

This invention relates to the field of lithium battery production technology, specifically to a cylindrical lithium battery electrolyte injection device and method. The device includes a lower cylinder with a first annular partition dividing it into a central storage chamber and an annular suction chamber. A worktable is mounted on the upper part of the lower cylinder, and a drive assembly for rotating the worktable is mounted on one side of the lower cylinder. The worktable is divided into several groups of electrolyte injection working areas along its circumference. A suction part is installed on one side of each electrolyte injection working area to draw electrolyte from the central storage chamber to the injection working area. Several support tubes are arranged along the length of each electrolyte injection working area, and fixing parts for fixing inverted lithium batteries are installed on the support tubes. Several sets of vacuuming assemblies are installed in the annular suction chamber, each vacuuming assembly including several vacuuming needles that can penetrate the support tubes and enter the lithium battery. This invention allows for continuous lithium battery electrolyte injection via the annularly arranged worktable, improving the efficiency of lithium battery electrolyte injection.

Description

Technical Field

[0001] This invention relates to the field of lithium battery technology, and in particular to a cylindrical lithium battery electrolyte filling device and method. Background Technology

[0002] Cylindrical lithium batteries are a type of lithium battery characterized by high capacity, long cycle life, and a wide operating temperature range. Electrolyte filling is a crucial step in cylindrical battery production. Currently, many companies use negative pressure backflow filling machines. This involves first creating a negative pressure inside the battery box, then connecting the battery box to the electrolyte via tubing. This creates a pressure difference between the inside of the battery box and the space containing the electrolyte, using this pressure difference to draw the electrolyte back into the battery box, thus completing the automatic filling process. Chinese patent application number CN202011488724.7 discloses a reverse-suction cylindrical battery electrolyte injection device and method. The injection device includes an electrolyte tank and a compatible battery box. The bottom of the electrolyte tank has a vacuum chamber, and one side of the vacuum chamber has a vacuum source interface for connecting to a vacuum pump. The top of the vacuum chamber has multiple sets of suction needles, the bottom ends of which are connected to the vacuum chamber. The bottom of the battery box has battery holders for fixing the battery, and each battery holder has a suction hole corresponding to one of the suction needles, allowing the suction needles to pass through the suction holes and be inserted into the battery. This method requires the battery to be installed and removed as a single unit during electrolyte injection, which is not conducive to continuous electrolyte injection. Summary of the Invention

[0003] In view of this, the purpose of this invention is to provide a cylindrical lithium battery liquid injection device and liquid injection method to solve the problem that existing battery liquid injection is not convenient to be carried out continuously.

[0004] To achieve the above objectives, the present invention provides a cylindrical lithium battery electrolyte filling device, comprising a lower cylinder, wherein a first annular partition is installed inside the lower cylinder, dividing the lower cylinder into a central electrolyte storage chamber and an annular suction chamber. A worktable is rotatably mounted on the upper part of the lower cylinder, and a drive assembly for rotating the worktable is installed on one side of the lower cylinder. The worktable is evenly divided into several groups of electrolyte filling working areas along its circumference. A suction part for drawing electrolyte from the central electrolyte storage chamber to the electrolyte filling working area is installed on one side of the electrolyte filling working area. Several support tubes are provided along the length of the electrolyte filling working area, and a fixing part for fixing an inverted lithium battery is installed on the support tube. Several groups of vacuuming assemblies are installed in the annular suction chamber, and the vacuuming assembly includes several vacuuming needles, which can penetrate the support tubes and enter the lithium battery.

[0005] Optionally, the workbench includes an annular box and an upper cover. A second annular partition is installed inside the annular box, dividing the annular box into an injection working chamber and a residual liquid storage chamber. Several baffles are evenly distributed along the circumference of the injection working chamber, dividing the injection working chamber into an injection working area. A first connecting hole is provided on the second annular partition to connect the injection working chamber and the residual liquid storage chamber. A first electric cylinder is installed on the upper cover, and a vertical baffle is installed at the output end of the first electric cylinder. The vertical baffle is used to control the opening and closing of the first connecting hole. Several through holes are also provided on the upper cover, and the through holes correspond to the positions of the support tubes.

[0006] Optionally, the fixing part includes a fixing ring platform, a settling groove is provided in the fixing ring platform, a plurality of second connecting holes are evenly distributed in the settling groove, a suction tube is installed at the lower part of the second connecting holes, a connecting groove is provided in the settling groove connecting the second connecting holes and the middle part of the fixing ring platform, a movable plate is also installed in the liquid injection working area, a plurality of through holes are provided on the movable plate, the through holes are corresponding to the position of the fixing ring platform, a telescopic tube is installed at the upper part of the through holes, an elastic hoop is installed at the upper end of the telescopic tube, a second electric cylinder is installed on the upper cover, the output end of the second electric cylinder passes through the annular box and is connected to the movable plate.

[0007] Optionally, a sealing valve is installed in the upper part of the support tube, and a material leakage groove is provided on the outer edge of the upper part of the support tube.

[0008] Optionally, the suction unit includes a suction pump, the inlet end of which extends into the central liquid storage chamber, and the outlet end of which extends into the injection working area.

[0009] Optionally, the vacuum assembly includes a main pipe, one end of which is connected to an external vacuum source. Several vertical pipes, connected at both ends, are vertically mounted on the main pipe. A vacuum needle is slidably mounted inside each vertical pipe. Two piston rings are mounted on the vacuum needle, and several first through holes are formed between the two piston rings. A second through hole is formed at the upper part of the vertical pipe. Several third through holes are formed on the side of the main pipe, and the third through holes are connected to the second through holes via branch pipes. A suction pipe is installed at the lower end of the vertical pipe and is connected to an external suction gas source. The vacuum needle has a side annular cavity and a central cavity penetrating the vacuum needle. The first through holes are connected to the side annular cavity. A fourth through hole, angled downwards, is formed between the central cavity and the side annular cavity. A sealing assembly for sealing the central cavity is installed at the lower part of the vacuum needle.

[0010] Optionally, the sealing assembly includes a sealing plate, a guide post is installed at the lower part of the vacuum needle, the sealing plate and the guide post are slidably connected, a first electromagnet is installed on the guide post, a second electromagnet is installed on the sealing plate, and a sealing head is installed in the middle of the side of the sealing plate facing the vacuum needle.

[0011] Optionally, the drive assembly includes a drive motor, the output end of which is equipped with a first gear, and the side surface of the worktable is equipped with a second gear, wherein the first gear meshes with the second gear.

[0012] Optionally, a first drain port is provided at the bottom of the lower cylinder, and a second drain port is provided on one side of the workbench.

[0013] Based on the above embodiments, a liquid injection method for a cylindrical lithium battery liquid injection device is proposed, comprising the following steps:

[0014] The workbench has a loading station and a unloading station. The loading station places multiple sets of cylindrical lithium batteries, corresponding to the support tubes, upside down onto the workbench. The fixing part secures the cylindrical lithium batteries, and electrolyte is added to the central liquid storage chamber. The suction part draws the electrolyte from the central liquid storage chamber into the liquid injection working area where the cylindrical lithium batteries are placed. The drive component rotates the workbench, moving the liquid injection working area containing the cylindrical lithium batteries above the vacuuming component. The vacuuming component inserts a vacuuming needle through the support tube into the lithium battery to create a vacuum inside the lithium battery. The electrolyte in the liquid injection working area is drawn into the lithium battery. After the electrolyte is completely immersed in the lithium battery, the vacuuming needle is pulled out of the lithium battery, and the workbench rotates to the unloading station to remove the lithium battery.

[0015] The beneficial effects of this invention are as follows: By arranging the worktable in a ring shape and having a loading station and a unloading station, multiple sets of cylindrical lithium batteries corresponding to the support tubes can be placed upside down onto the worktable from the loading station using a robotic arm or similar means. The cylindrical lithium batteries are fixed by a fixing part, and electrolyte is added to the central liquid storage chamber. The suction part draws the electrolyte from the central liquid storage chamber into the liquid injection working area where the cylindrical lithium batteries are placed. The drive component drives the worktable to rotate, rotating the liquid injection working area containing the cylindrical lithium batteries to above the vacuuming component. The vacuuming component inserts a vacuuming needle through the support tube into the lithium battery to evacuate the lithium battery. The electrolyte located in the liquid injection working area is drawn into the lithium battery. After the electrolyte is completely immersed in the lithium battery, the vacuuming needle is pulled out of the lithium battery, and the worktable rotates to the unloading station to unload the lithium battery. The ring-shaped worktable allows for continuous lithium battery liquid injection, improving the efficiency of lithium battery liquid injection. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention 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 for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a cylindrical lithium battery electrolyte filling device according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the lower cylinder of an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the annular box body according to an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of a cylindrical lithium battery electrolyte filling device for removing the upper cover according to an embodiment of the present invention;

[0021] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0022] Figure 6 This is a schematic diagram of the telescopic tube and the elastic clamp.

[0023] Figure 7 This is a schematic diagram of a closed valve;

[0024] Figure 8 This is a schematic diagram of the vacuum pumping assembly;

[0025] Figure 9 This is a schematic diagram of a vacuum needle;

[0026] Figure 10 This is a partial cross-sectional view of the vacuum needle;

[0027] Figure 11 This is a schematic diagram of the sealing component.

[0028] The diagram is marked as follows:

[0029] 1. Lower cylinder; 2. First annular baffle; 3. Central liquid storage chamber; 4. Annular suction chamber; 5. Worktable; 6. Liquid injection working area; 7. Support tube; 8. Vacuum needle; 9. Annular box; 10. Upper cover; 11. Second annular baffle; 12. Liquid injection working chamber; 13. Residual liquid storage chamber; 14. Baffle; 15. First connecting hole; 16. First electric cylinder; 17. Vertical baffle; 18. Through hole; 19. Fixed ring platform; 20. Settling tank; 21. Second connecting hole; 22. Connecting groove; 23. Movable plate; 24. Extension 25. Retracting tube; 26. Elastic hoop; 27. Second electric cylinder; 28. Sealing valve; 29. ​​Suction pump; 20. Main pipe; 31. Vertical pipe; 32. Piston ring; 33. First through hole; 34. Second through hole; 35. Third through hole; 36. Branch pipe; 37. Suction pipe; 38. Side annular cavity; 39. Central cavity; 40. Fourth through hole; 41. Sealing plate; 42. Guide post; 43. First electromagnet; 44. Second electromagnet; 45. Sealing head; 46. Drive motor; 47. First gear; 48. Second gear. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0031] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0032] like Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, a cylindrical lithium battery electrolyte filling device includes a lower cylinder 1. A first annular partition 2 is installed inside the lower cylinder 1, dividing the lower cylinder 1 into a central electrolyte storage chamber 3 and an annular suction chamber 4. A worktable 5 is rotatably installed on the upper part of the lower cylinder 1. A drive assembly for rotating the worktable 5 is installed on one side of the lower cylinder 1. The worktable 5 is evenly divided into several groups of electrolyte filling working areas 6 along its circumference. A suction part is installed on one side of the electrolyte filling working area 6 to draw electrolyte from the central electrolyte storage chamber 3 to the electrolyte filling working area 6. Several support tubes 7 are arranged along the length of the electrolyte filling working area 6. Fixing parts for fixing flip-chipped lithium batteries are installed on the support tubes 7. Several groups of vacuuming assemblies are installed in the annular suction chamber 4. The vacuuming assembly includes several vacuuming needles 8, which can penetrate the support tubes 7 and enter the lithium battery.

[0033] The workbench 5 is arranged in a ring shape and has a loading station and a unloading station. Multiple sets of cylindrical lithium batteries corresponding to the support tube 7 can be placed upside down on the workbench 5 by means of a robot arm or other means. The fixing part fixes the cylindrical lithium batteries. Electrolyte is added to the liquid storage chamber 3 in the middle. The suction part sucks the electrolyte in the liquid storage chamber 3 into the liquid injection working area 6 where the cylindrical lithium batteries are placed. The drive component drives the workbench 5 to rotate, rotating the liquid injection working area 6 where the cylindrical lithium batteries are placed to the top of the vacuum component. The vacuum component inserts the vacuum needle 8 through the support tube 7 into the lithium battery to evacuate the lithium battery. The electrolyte in the liquid injection working area 6 is sucked into the lithium battery. After the electrolyte is completely immersed in the lithium battery, the vacuum needle 8 is pulled out from the lithium battery. The workbench 5 rotates to the unloading station to unload the lithium battery.

[0034] The present invention enables continuous lithium battery electrolyte injection through the ring-shaped worktable 5, thereby improving the efficiency of lithium battery electrolyte injection.

[0035] In one implementation, such as Figure 1 , Figure 3 As shown, the workbench 5 includes an annular box 9 and an upper cover 10. A second annular partition 11 is installed inside the annular box 9, which divides the annular box 9 into an injection working chamber 12 and a residual liquid storage chamber 13. Several baffles 14 are evenly distributed along the circumference of the injection working chamber 12, which divides the injection working chamber 12 into an injection working area 6. A first connecting hole 15 is opened on the second annular partition 11 to connect the injection working chamber 12 and the residual liquid storage chamber 13. A first electric cylinder 16 is installed on the upper cover 10. A vertical baffle 17 is installed at the output end of the first electric cylinder 16. The vertical baffle 17 is used to control the opening and closing of the first connecting hole 15. Several through holes 18 are also opened on the upper cover 10, and the through holes 18 correspond to the positions of the support tube 7.

[0036] The lithium battery is installed into the fixing part through the through hole 18. When the electrolyte is injected into the lithium battery, the first electric cylinder 16 drives the vertical baffle 17 to block the first connecting hole 15. The electrolyte is first injected into the injection working chamber 12. When there is residual electrolyte in the injected lithium battery, the first electric cylinder 16 drives the vertical baffle 17 to open the first connecting hole 15. The residual electrolyte flows to the residual liquid storage chamber 13 to reduce the amount of residual liquid entering the lithium battery. In order to reduce the residual electrolyte in the injection working chamber 12, the bottom surface of the residual liquid storage chamber 13 is lower than the bottom surface of the injection working chamber 12.

[0037] In one implementation, such as Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, the fixing part includes a fixing ring platform 19, a settling groove 20 is provided in the fixing ring platform 19, and a plurality of second connecting holes 21 are evenly distributed in the settling groove 20. A suction tube is installed at the lower part of the second connecting holes 21. A connecting groove 22 is provided in the settling groove 20 to connect the second connecting holes 21 with the middle part of the fixing ring platform 19. A movable plate 23 is also installed in the liquid injection working area 6. A plurality of through holes are provided on the movable plate. The through holes correspond to the positions of the fixing ring platform 19. A telescopic tube 24 is installed at the upper part of the through holes. An elastic hoop 25 is installed at the upper end of the telescopic tube 24. A second electric cylinder 26 is installed on the upper cover 10. The output end of the second electric cylinder 26 passes through the annular box 9 and is connected to the movable plate 23.

[0038] The lithium battery is placed upside down in the sink 20 of the fixed ring platform 19. The second electric cylinder 26 drives the movable plate 23 to move upward. The movable plate 23 drives the elastic hoop 25 to retract from the fixed ring platform 19 and fix the elastic hoop 25 to the lithium battery. Since the lithium battery receives a downward vacuum suction force, the elastic hoop 25 drives the telescopic tube 24 to seal the upper part of the lithium battery. When the inside of the lithium battery is evacuated, a suction force is generated. The suction tube draws electrolyte from the electrolyte injection working chamber 12. The electrolyte is drawn into the lithium battery through the connecting groove 22. After the electrolyte is injected into the lithium battery, the second electric cylinder 26 drives the movable plate 23 to move downward. The movable plate 23 pulls the elastic hoop 25 back to the outer surface of the fixed ring platform 19 through the telescopic tube 24.

[0039] In one embodiment, a sealing valve 27 is installed in the upper part of the support tube 7, and a leakage groove is formed on the outer edge of the upper part of the support tube 7. When the vacuum needle 8 is withdrawn from the lithium battery, the sealing valve 27 seals the upper part of the support tube 7, and the residual electrolyte leaks back into the electrolyte injection working chamber 12 through the leakage groove. At the same time, the sealing valve 27, together with the elastic band 25 and the telescopic tube 24, seals the lithium battery, facilitating smooth vacuuming.

[0040] In one embodiment, the suction unit includes a suction pump 28, the inlet end of which extends into the central liquid storage chamber 3, and the outlet end of which extends into the liquid injection working area 6.

[0041] In one implementation, such as Figure 8 , Figure 9 , Figure 10 , Figure 11 As shown, the vacuum assembly includes a main pipe 29, one end of which is connected to an external vacuum source. Several vertical pipes 30, each connected at both ends, are vertically mounted on the main pipe 29. A vacuum needle 8 is slidably mounted within each vertical pipe 30. Two piston rings 31 are mounted on each vacuum needle 8. The vertical pipes 30, vacuum needle 8, and piston rings 31 combine to form a cylinder structure. A suction pipe 36 is installed at the lower end of the vertical pipe 30 and is connected to an external suction air source. The suction air source provides power to the cylinder structure, driving the vacuum needle 8 to move. A plurality of first through holes 32 are provided between the plug rings 31. A second through hole 33 is provided at the upper part of the vertical pipe 30. A plurality of third through holes 34 are provided on the side of the main pipe 29. The third through holes 34 and the second through holes 33 are connected through a branch pipe 35. The vacuum needle 8 is provided with a side annular cavity 37 and a central cavity 38 that penetrates the vacuum needle 8. The first through holes 32 are connected to the side annular cavity 37. A fourth through hole 39 is provided obliquely downward between the central cavity 38 and the side annular cavity 37. A sealing assembly for sealing the central cavity 38 is installed at the lower part of the vacuum needle 8.

[0042] When the vacuum needle 8 moves to the upper part, it is inserted into the lithium battery. At this time, the sealing assembly seals the central cavity 38. The first through hole 32 and the second through hole 33 are connected. An external vacuum source causes the main pipe 29 to generate suction. The main pipe 29 generates suction through the branch pipe 35 to generate suction through the fourth through hole 39, which in turn generates suction in the central cavity 38 to evacuate the lithium battery. To ensure that the lithium battery is completely immersed in electrolyte, the vacuum needle 8 can draw in a small amount of electrolyte. The entry of electrolyte into the central cavity 38 indicates that the evacuation is complete. The downwardly oriented fourth through hole 39 can reduce or even avoid drawing electrolyte into the side annular cavity 37. An external suction air source generates suction, causing the vacuum needle 8 to move out of the lithium battery. The first through hole 32 is also disconnected from the second through hole 33. The sealing assembly is opened, and the electrolyte drawn into the central cavity 38 is discharged.

[0043] In one embodiment, the sealing assembly includes a sealing plate 40, a guide post 41 is mounted on the lower part of the vacuum needle 8, the sealing plate 40 and the guide post 41 are slidably connected, a first electromagnet 42 is mounted on the guide post 41, a second electromagnet 43 is mounted on the sealing plate 40, and a sealing head 44 is mounted on the middle part of the side of the sealing plate 40 facing the vacuum needle 8.

[0044] By energizing the first electromagnet 42 and the second electromagnet 43 to change their magnetic directions, the sealing plate 40 is moved, thereby achieving the sealing and opening of the cavity of the sealing head 44.

[0045] Optionally, the drive assembly includes a drive motor 45, the output end of which is equipped with a first gear 46, and the side surface of the worktable 5 is equipped with a second gear 47, wherein the first gear 46 meshes with the second gear 47.

[0046] Optionally, a first drain port is provided at the bottom of the lower cylinder 1, and a second drain port is provided on one side of the workbench 5. The second drain port is connected to the residual liquid storage chamber 13 to facilitate the discharge of electrolyte from the lower cylinder 1 and the residual liquid storage chamber 13.

[0047] Based on the above embodiments, a liquid injection method for a cylindrical lithium battery liquid injection device is proposed, comprising the following steps:

[0048] Multiple sets of cylindrical lithium batteries are placed upside down on the worktable 5 from the loading station, corresponding to the positions of the support tubes 7. The fixing part fixes the cylindrical lithium batteries. Electrolyte is added to the middle liquid storage chamber 3. The suction part sucks the electrolyte in the middle liquid storage chamber 3 into the liquid injection working area 6 where the cylindrical lithium batteries are placed. The drive component drives the worktable 5 to rotate, rotating the liquid injection working area 6 containing the cylindrical lithium batteries to above the vacuum component. The vacuum component inserts the vacuum needle 8 through the support tubes 7 into the lithium battery to evacuate the lithium battery. The electrolyte in the liquid injection working area 6 is sucked into the lithium battery. After the electrolyte is completely immersed in the lithium battery, the vacuum needle 8 is pulled out from the lithium battery. The worktable 5 rotates to the unloading station to unload the lithium battery.

[0049] The present invention enables continuous lithium battery electrolyte injection through the ring-shaped worktable 5, thereby improving the efficiency of lithium battery electrolyte injection.

[0050] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in the details for the sake of brevity.

[0051] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A cylindrical lithium battery electrolyte filling device, comprising a lower cylinder (1), characterized in that, The lower cylinder (1) is equipped with a first annular partition (2), which divides the lower cylinder (1) into a central liquid storage chamber (3) and an annular suction chamber (4). A worktable (5) is rotatably installed on the upper part of the lower cylinder (1). A drive assembly for rotating the worktable (5) is installed on one side of the lower cylinder (1). The worktable (5) is divided into several groups of liquid injection working areas (6) along its circumference. A suction part for sucking the electrolyte in the central liquid storage chamber (3) to the liquid injection working area (6) is installed on one side of the liquid injection working area (6). Several support tubes (7) are provided along the length of the liquid injection working area (6). A fixing part for fixing the flip-connected lithium battery is installed on the support tube (7). Several groups of vacuum assembly are installed in the annular suction chamber (4). The vacuum assembly includes several vacuum needles (8). The vacuum needles (8) can penetrate the support tubes (7) and enter the lithium battery. The workbench (5) includes an annular box (9) and an upper cover (10). A second annular partition (11) is installed inside the annular box (9). The second annular partition (11) divides the annular box (9) into an injection working chamber (12) and a residual liquid storage chamber (13). Several baffles (14) are evenly distributed along the circumference of the injection working chamber (12). The baffles (14) divide the injection working chamber (12) into the injection working area (6). The second annular partition ( 11) A first connecting hole (15) is provided on the upper cover (10) for connecting the liquid injection working chamber (12) and the residual liquid storage chamber (13). A first electric cylinder (16) is installed on the upper cover (10). A vertical baffle (17) is installed at the output end of the first electric cylinder (16). The vertical baffle (17) is used to control the opening and closing of the first connecting hole (15). A number of through holes (18) are also provided on the upper cover (10). The through holes (18) correspond to the positions of the support tube (7).

2. The cylindrical lithium battery electrolyte filling device according to claim 1, characterized in that, The fixing part includes a fixing ring platform (19), a settling groove (20) is provided in the fixing ring platform (19), a number of second connecting holes (21) are evenly distributed in the settling groove (20), a suction tube is installed at the lower part of the second connecting hole (21), a connecting groove (22) connecting the second connecting hole (21) and the middle part of the fixing ring platform (19) is provided in the settling groove (20), a movable plate (23) is also installed in the liquid injection working area (6), a number of through holes are provided on the movable plate (23), the through holes are corresponding to the position of the fixing ring platform (19), a telescopic tube (24) is installed at the upper part of the through holes, an elastic hoop (25) is installed at the upper end of the telescopic tube (24), a second electric cylinder (26) is installed on the upper cover (10), the output end of the second electric cylinder (26) passes through the annular box (9) and is connected to the movable plate (23).

3. The cylindrical lithium battery electrolyte filling device according to claim 2, characterized in that, A sealing valve (27) is installed in the upper part of the support tube (7), and a material leakage groove is opened on the outer edge of the upper part of the support tube (7).

4. The cylindrical lithium battery electrolyte filling device according to claim 1, characterized in that, The suction unit includes a suction pump (28), the inlet end of which extends into the central storage chamber (3), and the outlet end of which extends into the injection working area (6).

5. The cylindrical lithium battery electrolyte filling device according to claim 1, characterized in that, The vacuum assembly includes a main pipe (29), one end of which is connected to an external vacuum source. Several vertical pipes (30) connected at both ends are vertically mounted on the main pipe (29). A vacuum needle (8) is slidably installed inside each vertical pipe (30). Two piston rings (31) are mounted on the vacuum needle (8). Several first through holes (32) are formed between the two piston rings (31). A second through hole (33) is formed at the upper part of the vertical pipe (30). Several third through holes (34) are formed on the side of the main pipe (29). 4) The second through hole (33) is connected to the branch pipe (35). The lower end of the vertical pipe (30) is equipped with a suction pipe (36). The suction pipe (36) is connected to an external suction air source. The vacuum needle (8) is provided with a side annular cavity (37) and a central cavity (38) that penetrates the vacuum needle (8). The first through hole (32) is connected to the side annular cavity (37). A fourth through hole (39) is provided between the central cavity (38) and the side annular cavity (37). A sealing component for sealing the central cavity (38) is installed at the lower part of the vacuum needle (8).

6. The cylindrical lithium battery electrolyte filling device according to claim 5, characterized in that, The sealing assembly includes a sealing plate (40), a guide post (41) is installed on the lower part of the vacuum needle (8), the sealing plate (40) and the guide post (41) are slidably connected, a first electromagnet (42) is installed on the guide post (41), a second electromagnet (43) is installed on the sealing plate (40), and a sealing head (44) is installed in the middle of the side of the sealing plate (40) facing the vacuum needle (8).

7. The cylindrical lithium battery electrolyte filling device according to claim 1, characterized in that, The drive assembly includes a drive motor (45), the output end of which is equipped with a first gear (46), and the side surface of the worktable (5) is equipped with a second gear (47), wherein the first gear (46) meshes with the second gear (47).

8. The cylindrical lithium battery electrolyte filling device according to claim 1, characterized in that, The bottom of the lower cylinder (1) is provided with a first drain port, and the side of the workbench (5) is provided with a second drain port.

9. A method for injecting electrolyte into a cylindrical lithium battery electrolyte filling device as described in any one of claims 1-8, characterized in that, Includes the following steps: The workbench (5) has a loading station and a unloading station. Multiple sets of cylindrical lithium batteries are placed upside down on the workbench (5) at the position of the support tube (7) corresponding to the loading station. The fixing part fixes the cylindrical lithium batteries. Electrolyte is added to the middle liquid storage chamber (3). The suction part sucks the electrolyte in the middle liquid storage chamber (3) into the liquid injection working area (6) where the cylindrical lithium batteries are placed. The drive component drives the workbench (5) to rotate, and rotates the liquid injection working area (6) where the cylindrical lithium batteries are placed to the top of the vacuum component. The vacuum component inserts the vacuum needle (8) through the support tube (7) into the lithium battery to vacuum the lithium battery. The electrolyte in the liquid injection working area (6) is sucked into the lithium battery. After the electrolyte is completely immersed in the lithium battery, the vacuum needle (8) is pulled out from the lithium battery. The workbench (5) rotates to the unloading station to unload the lithium battery.

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