A rotary multi-station sealed cavity structure for a lithium battery negative pressure liquid injection machine

Abstract

This invention discloses a rotary multi-station sealed cavity structure for a lithium battery negative pressure liquid injection machine, relating to the field of lithium battery liquid injection technology. The proposed solution includes a housing, a rotating disk rotatably connected to the top of the housing, a through-hole loading box inserted into the rotating disk, multiple mounting seats mounted on the housing, a movable sealing cover connected to a support frame, an injection pipe connected to the sealing cover, the injection pipe equipped with a nitrogen delivery pump and a negative pressure pump, a through-hole connecting hole at the bottom of the loading box, and a movable docking ring connected to the support frame, the docking ring equipped with an energy storage tank. This invention, by providing multiple mounting seats on the housing, can accommodate equipment such as a sealing machine, achieving multi-station collaboration and improving efficiency. The sealing cover moves down to form a closed cavity with the loading box. The negative pressure pump draws air to create negative pressure inside and outside the battery, preventing damage to the outer casing. After liquid injection, the nitrogen delivery pump creates positive pressure in the cavity, promoting electrolyte wetting. The sealed cavity communicates and balances with the energy storage tank, recovering some of the nitrogen.

Description

Technical Field

[0001] This invention relates to the field of lithium battery liquid filling technology, and in particular to a rotary multi-station sealed cavity structure for a lithium battery negative pressure liquid filling machine. Background Technology

[0002] Lithium batteries are mainly composed of positive and negative electrode materials, positive and negative electrode conductive substrates, separators, electrolytes, and assemblies. The typical process includes: stirring of positive and negative electrode materials, coating of positive and negative electrode materials, rolling, sheet making, winding or stacking, electrolyte injection and sealing, and formation and capacity testing. The working principle of lithium batteries is that during charging, lithium ions are extracted from the positive electrode, pass through the electrolyte, and insert into the negative electrode particles. During discharging, lithium ions are extracted from the negative electrode and swim back to the positive electrode material through the electrolyte.

[0003] A search of Chinese invention patents revealed an invention with publication number CN115241615B entitled "A Lithium Battery Positive and Negative Pressure Injection Machine." This invention achieves automated lithium battery injection by configuring an injection sleeve, a battery clamp, and first and second power mechanisms. The injection sleeve has a sliding port at the top, an injection connector at the bottom, process air holes and injection inlets on both sides, and a sealing sliding rod inside. During operation, the lithium battery is placed in the battery clamp, and the first power mechanism raises the clamp to make the lithium battery injection port tightly fit the injection connector, sealing the relevant gaps. After evacuating the air from the sleeve and the battery, the second power mechanism pushes the sealing sliding rod to press the connector. After the electrolyte is introduced, the sliding rod is pulled away, and the electrolyte is rapidly injected into the battery using the air pressure difference, improving the injection efficiency.

[0004] However, in actual use, the above and similar technical solutions still have some problems: 1. The single-unit working mode is adopted, which lacks a multi-station collaborative working structure. This is not conducive to the effective integration of equipment such as sealing machines, and is likely to lead to poor production process connection, low equipment utilization, and is not conducive to improving overall work efficiency. 2. In the battery electrolyte filling process, if negative pressure is created by simply extracting air from the battery, it will result in a significant pressure difference between the inside and outside of the battery casing. Since the battery casing material has limited strength, an excessive pressure difference can easily cause stress concentration in the casing, resulting in irreversible deformation or even damage, affecting the battery's sealing and safety, and posing a potential threat to product quality. 3. After the battery is filled with electrolyte, nitrogen gas is often injected to pressurize it and accelerate the electrolyte wetting process. However, the nitrogen gas is directly discharged after pressurization, which is wasteful. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a rotary multi-station sealed cavity structure for a lithium battery negative pressure injection machine that facilitates multi-device collaborative work, protects the battery casing, and recovers some nitrogen gas.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A rotary multi-station sealed cavity structure for a lithium battery negative pressure injection machine includes a housing, a rotating disk rotatably connected to the top of the housing, a through loading box inserted into the rotating disk for placing batteries, and multiple mounting seats installed on the housing. One of the mounting bases is connected to a liquid injection mechanism, which includes a support frame. The mounting base is equipped with the support frame, and the support frame is connected to a movable sealing cover. The bottom end of the sealing cover is used to abut and engage with the top end of the loading box. The top end of the sealing cover is equipped with multiple through sealing rings, and through injection tubes are slidably fitted on the sealing rings. The top end of the injection tube is equipped with a communicating injection box, and the bottom end of the injection tube is used to connect with the battery's injection port. Multiple injection tubes are equipped with the same communicating first manifold. A third solenoid valve and a flow meter are installed above the injection tubes. The first manifold is equipped with a nitrogen delivery pump and a negative pressure pump. The loading box is connected to an energy storage mechanism, which includes a connecting hole. The bottom of the loading box is provided with a through connecting hole. A movable docking ring is connected to the support frame. The docking ring is used to dock with the connecting hole. The docking ring is equipped with an energy storage tank.

[0007] Preferably, a pair of vertical racks are slidably connected to the support frame, and a second gear is rotatably connected between the pair of racks. The second gear meshes with the racks. The sealing cover is fixedly connected to one of the racks, and a fixing plate is fixedly connected to the other rack. The docking ring is fixed to the fixing plate. A second cylinder is installed on the support frame, and the telescopic end of the second cylinder is fixedly connected to the fixing plate.

[0008] Preferably, the connecting hole is a countersunk hole, the top end of the docking ring extends into the countersunk hole of the connecting hole, and a sealing ring is installed on the extended end of the docking ring, and the docking ring is sealed to the loading box by contact with the sealing ring.

[0009] Preferably, a sealing ring is also installed at the bottom end of the injection tube, and the injection tube is sealed by contacting the injection port of the battery through the sealing ring.

[0010] Preferably, a mounting plate is fixedly connected to the sealing cover, a loading plate is slidably connected to the mounting plate, multiple injection boxes are mounted on the loading plate, a first cylinder is mounted on the mounting plate, and the telescopic end of the first cylinder is fixedly connected to the loading plate.

[0011] Preferably, the energy storage tank is equipped with a connecting pipe, the end of which is installed on the docking ring and connected to the docking ring, and a fourth solenoid valve is installed on the connecting pipe.

[0012] Preferably, the output end of the nitrogen delivery pump is equipped with a gas delivery pipe, the end of the gas delivery pipe is installed on and connected to the first collecting pipe, and a second solenoid valve is installed on the gas delivery pipe.

[0013] Preferably, the negative pressure pump has an air extraction pipe installed on its air extraction end, the end of the air extraction pipe is installed on and connected to the first manifold, and a first solenoid valve is installed on the air extraction pipe.

[0014] Preferably, a liquid storage tank is installed on the support frame, an infusion pump is installed on the liquid storage tank, the input end of the infusion pump is connected to the liquid storage tank, and the output end of the infusion pump is connected to a second manifold, which is connected to multiple injection boxes.

[0015] Preferably, a rotating mechanism is installed on the rotating disk, the rotating mechanism includes an internal gear, the internal gear is installed at the bottom end of the rotating disk, a first motor is installed on the housing, and a first gear is keyed to the output shaft of the first motor, the first gear meshing with the internal gear.

[0016] Compared with the prior art, the present invention provides a rotary multi-station sealed cavity structure for a lithium battery negative pressure injection machine, which has the following advantages: 1. The rotary multi-station sealed cavity structure of this lithium battery negative pressure injection machine has multiple mounting seats on the shell. Different equipment can be installed through the mounting seats, such as sealing machines. The loading box containing the battery is inserted into the rotary disk by an external robotic arm, which drives the rotary disk to rotate, thereby moving the loading box containing the battery to different work stations, realizing multi-station collaborative work and improving work efficiency.

[0017] 2. The rotary multi-station sealed cavity structure of this lithium battery negative pressure injection machine features a lowered sealing cover that forms a sealed cavity between the cover and the loading box. The negative pressure pump creates negative pressure within the sealed cavity through the suction pipe, ensuring that both the inside and outside of the battery are under negative pressure. This prevents excessive pressure difference between the battery's interior and the atmospheric environment, thus avoiding damage to the battery casing. By applying a certain negative pressure to the outside of the battery, the pressure on the battery casing is reduced, preventing damage. After injection, a nitrogen delivery pump is activated to create positive pressure within the sealed cavity, promoting electrolyte immersion and ensuring the quality of the battery injection.

[0018] 3. The rotary multi-station sealed chamber structure of this lithium battery negative pressure injection machine is such that before nitrogen is injected, the sealed chamber is under negative pressure and connected to the energy storage tank. Nitrogen enters the sealed chamber, causing the energy storage tank to also be under a low negative pressure. After nitrogen is injected, the chamber becomes positive pressure. Before injecting the next battery, the two are connected again, and high-pressure nitrogen enters the energy storage tank to achieve balance. Because the energy storage tank is large, a lot of nitrogen will rush in. Before opening the sealing cover, the fourth solenoid valve is closed. During the reciprocating operation, the amount of nitrogen injected is greater than the amount of negative pressure extracted, and the pressure in the energy storage tank gradually increases. When the pressure is close to the pressure of the injected nitrogen, the nitrogen in the energy storage tank is released and recovered to normal pressure, which is convenient for collection again. This effectively reduces nitrogen consumption when opening the sealing cover and saves resources. Attached Figure Description

[0019] Figure 1 This is a perspective view of the rotary multi-station sealed cavity structure of a lithium battery negative pressure injection machine proposed in this invention; Figure 2 This is a view of the rotating disk connection structure of the present invention; Figure 3 This is a view of the support frame connection structure of the present invention; Figure 4 This is a view of the injection box connection structure of the present invention; Figure 5 This is a view of the fixing plate connection structure of the present invention; Figure 6 This is a view of the mounting plate connection structure of the present invention; Figure 7 This is a view of the first manifold connection structure of the present invention; Figure 8 This is a view of the injection tube connection structure of the present invention; Figure 9 This is a view of the rack and pinion connection structure of the present invention; Figure 10 This is a view of the loading box connection structure of the present invention.

[0020] In the diagram: 1. Housing; 2. Rotating mechanism; 21. Mounting base; 22. Rotating disk; 23. First gear; 24. First motor; 25. Internal gear; 3. Liquid injection mechanism; 31. Liquid injection box; 32. Liquid storage tank; 33. Support frame; 34. Negative pressure pump; 35. Nitrogen delivery pump; 36. Sealing cover; 37. Infusion pump; 38. Loading plate; 39. First cylinder; 310. Liquid injection pipe; 311. Vacuum pipe; 312. Second cylinder; 313 314. Fixed plate; 315. First manifold; 316. First solenoid valve; 317. Mounting plate; 318. Second solenoid valve; 319. Sealing ring; 320. Flow meter; 321. Third solenoid valve; 322. Rack; 323. Second gear; 324. Air supply pipe; 325. Second manifold; 4. Loading box; 51. Energy storage mechanism; 52. Energy storage tank; 53. Connecting pipe; 54. Connecting hole; 55. Connecting ring; 56. Fourth solenoid valve. Detailed Implementation

[0021] 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.

[0022] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] Example 1: Refer to Figures 1-10 A rotary multi-station sealed cavity structure for a lithium battery negative pressure injection machine includes a housing 1, a rotating disk 22 rotatably connected to the top of the housing 1, a through loading box 4 inserted into the rotating disk 22, the loading box 4 being used to place batteries, and multiple mounting seats 21 installed on the housing 1 to facilitate the installation of sealing machines and other equipment, and to facilitate multi-station collaborative work.

[0024] In this invention, a rotating mechanism 2 is installed on the rotating disk 22. The rotating mechanism 2 includes an internal gear 25. The internal gear 25 is installed at the bottom of the rotating disk 22. A first motor 24 is installed on the housing 1. A first gear 23 is keyed to the output shaft of the first motor 24. The first gear 23 meshes with the internal gear 25 to facilitate driving the rotating disk 22 to rotate.

[0025] Example 2: Based on Example 1, a rotary multi-station sealed cavity structure for a lithium battery negative pressure injection machine is provided. An injection mechanism 3 is connected to a mounting base 21. The injection mechanism 3 includes a support frame 33, which is mounted on the mounting base 21. A movable sealing cover 36 is connected to the support frame 33. The bottom end of the sealing cover 36 is used to abut and engage with the top end of the loading box 4. Multiple through-hole sealing rings 318 are installed at the top end of the sealing cover 36. Through-hole injection tubes 310 are slidably fitted onto the sealing rings 318. The top end of the tube 310 is equipped with a connected liquid injection box 31, and the bottom end of the liquid injection tube 310 is used to connect with the liquid injection port of the battery. Multiple liquid injection tubes 310 are connected to the same first manifold 314 to facilitate the injection of electrolyte into the battery. The liquid injection tube 310 is equipped with a third solenoid valve 320 and a flow meter 319 above the first manifold 314 to facilitate the control of the amount of electrolyte injected. The first manifold 314 is equipped with a nitrogen delivery pump 35 and a negative pressure pump 34 to facilitate the creation of negative and positive pressure environments to promote the absorption of electrolyte.

[0026] In this invention, a pair of vertical racks 321 are slidably connected to the support frame 33, and a second gear 322 is rotatably connected between the support frame 33 and the racks 321. The second gear 322 meshes with the racks 321. The sealing cover 36 is fixedly connected to one of the racks 321, and a fixing plate 313 is fixedly connected to the other rack 321. The mating ring 54 is fixed to the fixing plate 313. A second cylinder 312 is installed on the support frame 33, and the telescopic end of the second cylinder 312 is fixedly connected to the fixing plate 313 to facilitate driving the sealing cover 36 to close.

[0027] In this invention, a mounting plate 316 is fixedly connected to the sealing cover 36, and a loading plate 38 is slidably connected to the mounting plate 316. Multiple injection boxes 31 are installed on the loading plate 38. A first cylinder 39 is installed on the mounting plate 316. The telescopic end of the first cylinder 39 is fixedly connected to the loading plate 38, which facilitates driving the injection box 31 and the injection tube 310 to move downward.

[0028] In this invention, a suction pipe 311 is installed on the suction end of the negative pressure pump 34. The end of the suction pipe 311 is installed on the first manifold 314 and connected to the first manifold 314. A first solenoid valve 315 is installed on the suction pipe 311 to facilitate the negative pressure pump 34 to evacuate the liquid injection pipe 310 through the suction pipe 311.

[0029] In this invention, a sealing ring is installed at the bottom end of the injection tube 310. The injection tube 310 is sealed by contacting the injection port of the battery through the sealing ring, which facilitates the sealing of the injection tube 310 with the battery.

[0030] In this invention, a storage tank 32 is installed on the support frame 33, and an infusion pump 37 is installed on the storage tank 32. The input end of the infusion pump 37 is connected to the storage tank 32, and the output end of the infusion pump 37 is connected to a second manifold 324. The second manifold 324 is connected to multiple injection boxes 31 to facilitate the supply of electrolyte.

[0031] In this invention, a gas delivery pipe 323 is installed at the output end of the nitrogen delivery pump 35. The end of the gas delivery pipe 323 is installed on the first manifold 314 and connected to the first manifold 314. A second solenoid valve 317 is installed on the gas delivery pipe 323 to facilitate the delivery of nitrogen. A nitrogen source is connected to the input end of the nitrogen delivery pump 35.

[0032] Example 3: Based on Example 2, a rotary multi-station sealed cavity structure for a lithium battery negative pressure injection machine is provided. The loading box 4 is connected to an energy storage mechanism 5. The energy storage mechanism 5 includes a connecting hole 53. The bottom end of the loading box 4 is provided with a through connecting hole 53. A movable docking ring 54 is connected to the support frame 33. The docking ring 54 is used to dock with the connecting hole 53. The docking ring 54 is equipped with an energy storage tank 51, which facilitates the introduction of excess nitrogen into the energy storage tank 51 to avoid waste.

[0033] In this invention, the connecting hole 53 is a countersunk hole, and the top end of the docking ring 54 extends into the countersunk hole of the connecting hole 53. A sealing ring is also installed on the extended end of the docking ring 54. The docking ring 54 abuts against the loading box 4 through the sealing ring to facilitate docking and sealing of the docking ring 54.

[0034] In this invention, a connecting pipe 52 is installed on the energy storage tank 51. The end of the connecting pipe 52 is installed on the docking ring 54 and connected to the docking ring 54. A fourth solenoid valve 55 is installed on the connecting pipe 52 to facilitate the connection between the energy storage tank 51 and the loading box 4.

[0035] Working principle: Multiple mounting bases 21 are installed on the housing 1, through which different equipment can be installed, such as sealing machines. Multiple batteries are pre-loaded into the loading box 4. The loading box 4 containing batteries is inserted into the rotating disk 22 by an external robotic arm. The first motor 24 is started, which drives the first gear 23 to rotate, thereby driving the internal gear 25 to rotate, driving the rotating disk 22 to rotate, thereby driving the loading box 4 containing batteries to rotate, so that it moves to different work positions, realizing multi-work position collaborative work and improving work efficiency. During the battery electrolyte filling process, electrolyte is injected into the storage tank 32, pumped out by the infusion pump 37, and injected into each filling box 31 through the second manifold 324. The second cylinder 312 is activated, pushing the fixing plate 313 upward. Through the transmission of a pair of racks 321 and a second gear 322, the sealing cover 36 is driven downward. The sealing cover 36 will then snap onto the loading box 4 below, forming a closed cavity between the sealing cover 36 and the loading box 4. This seals the battery, activates the negative pressure pump 34, and opens the first solenoid valve 315. The negative pressure pump 34 creates negative pressure in the first manifold 314 through the suction pipe 311, and creates negative pressure in the sealed cavity through the injection pipe 310, thus placing the battery under negative pressure both inside and out. The first cylinder 39 is then activated, retracting and pulling the loading plate 38 downwards, which in turn moves the injection box 31 and the injection pipe 310 downwards. The injection pipe 310 then extends into the battery's injection port, injecting electrolyte. The bottom end of tube 310 contacts the battery's electrolyte inlet and is sealed by a sealing ring. The negative pressure pump 34 is restarted, which further creates negative pressure inside the battery through the injection tube 310, making the internal negative pressure greater than the external negative pressure, thus creating a negative pressure difference. This effectively prevents excessive pressure difference between the battery's internal and external environments, avoiding damage to the battery casing. The first solenoid valve 315 is closed, and the third solenoid valve 320 is opened. Under the negative pressure inside the battery, the electrolyte inside the injection box 31 is drawn into the battery, thus completing the electrolyte injection. The flow meter 319 can calculate the amount of electrolyte injected to prevent excessive electrolyte injection. The injection tube 310 is then moved upward to separate from the battery's electrolyte inlet. The third solenoid valve 320 is closed, and the second solenoid valve 317 is opened. The nitrogen delivery pump 35 is started, injecting nitrogen into the gas delivery pipe 323 and then into the closed cavity through the injection tube 310, thus creating positive pressure and promoting the wetting of the electrolyte, thereby ensuring the quality of the battery's electrolyte injection. When the sealing cover 36 moves down and engages with the loading box 4, the docking ring 54 moves up with the fixing plate 313, and the docking ring 54 abuts against the bottom end of the loading box 4, sealing it with a sealing ring. The docking ring 54 is connected to the inside of the loading box 4 through the connecting hole 53. Before injecting nitrogen, the fourth solenoid valve 55 is opened to connect the energy storage tank 51 with the inside of the loading box 4. Under the negative pressure inside the loading box 4 and the sealing cover 36, atmospheric pressure nitrogen is pre-injected into the energy storage tank 51. The nitrogen inside the energy storage tank 51 will enter between the loading box 4 and the sealing cover 36, thus making the inside of the energy storage tank 51 also a low negative pressure state. The fourth solenoid valve 55 is closed to cut off the connection of the energy storage tank 51. After nitrogen is injected into the sealed cavity through the nitrogen delivery pump 35, a positive pressure is formed inside the cavity. Before injecting the next battery, the fourth solenoid valve 55 is activated to connect the sealed cavity with the energy storage tank 51. The high-pressure nitrogen inside the sealed cavity will enter the energy storage tank 51 to achieve the desired effect. To balance the volume of the energy storage tank 51, which is larger than that of the sealed cavity, a larger amount of nitrogen gas flows into the energy storage tank 51. Before opening the sealing cover 36, the fourth solenoid valve 55 is closed. When filling the next battery with electrolyte, a negative pressure is drawn, and electrolyte is injected. Before injecting nitrogen gas, the fourth solenoid valve 55 is opened to connect the energy storage tank 51 with the sealed cavity. The nitrogen gas inside the energy storage tank 51 will preferentially replenish the negative pressure inside the sealed cavity. Since the drawn negative pressure is usually between -80 kPa and -95 kPa, and the injected nitrogen is usually at 0.2 MPa, the amount of injected nitrogen gas is greater than the amount of drawn negative pressure. Therefore, under reciprocating operation, the pressure inside the energy storage tank 51 will gradually increase, approaching the pressure of the injected nitrogen gas. When the pressure in the energy storage tank 51 is close to the pressure of the injected nitrogen gas, the nitrogen gas inside the energy storage tank 51 can be released and recovered, so that it is back to normal pressure. This facilitates the collection of nitrogen gas again, reduces the nitrogen gas consumption each time the sealing cover 36 is opened, and thus saves resources.

[0036] 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. A rotary multi-station sealed cavity structure of a lithium battery negative pressure liquid injection machine, comprising a shell (1), characterized in that: A rotating disk (22) is rotatably connected to the top of the housing (1), and a through loading box (4) is inserted into the rotating disk (22). The loading box (4) is used to place the battery, and multiple mounting bases (21) are installed on the housing (1). One of the mounting bases (21) is connected to a liquid injection mechanism (3), which includes a support frame (33). The support frame (33) is mounted on the mounting base (21), and a movable sealing cover (36) is connected to the support frame (33). The bottom end of the sealing cover (36) is used to abut and engage with the top end of the loading box (4). The top end of the sealing cover (36) is equipped with multiple through sealing rings (318), and through injection tubes are slidably fitted on the sealing rings (318). (310), the top end of the injection tube (310) is equipped with a connected injection box (31), the bottom end of the injection tube (310) is used to connect with the injection port of the battery, and a connected first manifold (314) is installed on multiple injection tubes (310). A third solenoid valve (320) and a flow meter (319) are installed above the first manifold (314) of the injection tube (310). The first manifold (314) is equipped with a nitrogen delivery pump (35) and a negative pressure pump (34). The loading box (4) is connected to an energy storage mechanism (5), the energy storage mechanism (5) includes a connecting hole (53), the bottom end of the loading box (4) is provided with a through connecting hole (53), the support frame (33) is connected to a movable docking ring (54), the docking ring (54) is used to dock with the connecting hole (53), and the docking ring (54) is equipped with an energy storage tank (51).

2. The rotary multi-station sealed cavity structure of a lithium battery negative pressure liquid injection machine according to claim 1, characterized in that, A pair of vertical racks (321) are slidably connected to the support frame (33). The support frame (33) is rotatably connected to a second gear (322) between the pair of racks (321). The second gear (322) meshes with the racks (321). The closing cover (36) is fixedly connected to one of the racks (321). A fixing plate (313) is fixedly connected to the other rack (321). The docking ring (54) is fixed to the fixing plate (313). A second cylinder (312) is installed on the support frame (33). The telescopic end of the second cylinder (312) is fixedly connected to the fixing plate (313).

3. The rotary multi-station sealed cavity structure of a lithium battery negative pressure liquid injection machine according to claim 1, characterized in that, The connecting hole (53) is a countersunk hole. The top end of the docking ring (54) extends into the countersunk hole of the connecting hole (53). A sealing ring is installed on the extended end of the docking ring (54). The docking ring (54) is sealed to the loading box (4) by contacting the sealing ring.

4. The rotary multi-station sealed cavity structure of a lithium battery negative pressure liquid injection machine according to claim 1, characterized in that, The bottom end of the injection tube (310) is also equipped with a sealing ring, and the injection tube (310) is sealed by contacting the injection port of the battery through the sealing ring.

5. The rotary multi-station sealed cavity structure of a lithium battery negative pressure liquid injection machine according to claim 1, characterized in that, An installation plate (316) is fixedly connected to the sealing cover (36), and a loading plate (38) is slidably connected to the installation plate (316). Multiple injection boxes (31) are installed on the loading plate (38). A first cylinder (39) is installed on the installation plate (316), and the telescopic end of the first cylinder (39) is fixedly connected to the loading plate (38).

6. The rotary multi-station sealed cavity structure of a lithium battery negative pressure liquid injection machine according to claim 1, characterized in that, The energy storage tank (51) is equipped with a connecting pipe (52), the end of which is installed on the docking ring (54) and connected to the docking ring (54). A fourth solenoid valve (55) is installed on the connecting pipe (52).

7. The rotary multi-station sealed cavity structure of a lithium battery negative pressure liquid injection machine according to claim 1, characterized in that, The nitrogen delivery pump (35) is equipped with a gas delivery pipe (323) at its output end. The end of the gas delivery pipe (323) is installed on the first manifold (314) and connected to the first manifold (314). A second solenoid valve (317) is installed on the gas delivery pipe (323).

8. The rotary multi-station sealed cavity structure of a lithium battery negative pressure injection machine according to claim 1, characterized in that, The negative pressure pump (34) has an air extraction pipe (311) installed on its air extraction end. The end of the air extraction pipe (311) is installed on the first manifold (314) and connected to the first manifold (314). A first solenoid valve (315) is installed on the air extraction pipe (311).

9. The rotary multi-station sealed cavity structure of a lithium battery negative pressure injection machine according to claim 1, characterized in that, A storage tank (32) is installed on the support frame (33), and an infusion pump (37) is installed on the storage tank (32). The input end of the infusion pump (37) is connected to the storage tank (32), and the output end of the infusion pump (37) is connected to a second manifold (324). The second manifold (324) is connected to multiple injection boxes (31).

10. The rotary multi-station sealed cavity structure of a lithium battery negative pressure injection machine according to claim 1, characterized in that, A rotating mechanism (2) is installed on the rotating disk (22). The rotating mechanism (2) includes an internal gear (25). An internal gear (25) is installed at the bottom of the rotating disk (22). A first motor (24) is installed on the housing (1). A first gear (23) is keyed to the output shaft of the first motor (24). The first gear (23) meshes with the internal gear (25).

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