A lithium ion battery liquid injection device

Abstract

The utility model discloses a kind of lithium ion battery liquid injection device, including liquid injection tank, closed assembly and arrangement component, arrangement component installs at least one battery body, closed assembly is movably buckled in liquid injection tank top, make liquid injection tank top end switch between opening state and closed state, after liquid injection tank and closed assembly are closed, air in closed cavity is discharged by negative pressure pump.The utility model is combined arrangement to multiple battery body, then be placed into the closed space of liquid injection tank and closed assembly composition, make electrolyte to be over the liquid injection hole of battery body, after vacuumizing, electrolyte is under the action of vacuum pressure, automatically from the liquid injection hole of inverted battery body flows into battery body interior, and is soaked in pole piece, until complete liquid injection, multiple battery body is filled with electrolyte, make full use of space, process multiple battery body once. The device is simple in structure, convenient to carry, convenient to use, and can be used for different types of electrolyte to carry out experimental battery DOE verification.

Description

Technical Field

[0001] This utility model relates to the field of battery liquid injection processing technology, and in particular to a lithium-ion battery liquid injection device. Background Technology

[0002] Traditional energy vehicles pose a dual threat of energy crisis and environmental pollution, urgently requiring the development and research of efficient, clean, and safe new energy vehicles to achieve energy conservation and emission reduction goals. Lithium-ion batteries, with their advantages of high specific energy, no pollution, and no memory effect, have become the best candidate for new energy vehicle power systems. Lithium-ion batteries typically come in two shapes: cylindrical and prismatic. Cylindrical lithium-ion batteries offer advantages such as a high voltage platform, long cycle life, and good safety performance, and are widely used in high-energy fields such as mobile devices, automobiles, and energy storage power stations. However, compared to general energy storage batteries, lithium-ion batteries, especially cylindrical ones, face challenges in manual electrolyte replenishment due to insufficient internal space.

[0003] The electrolyte plays a crucial role in conducting ions between the positive and negative electrodes of a lithium-ion battery, ensuring its high voltage and high specific energy. Electrolytes are generally prepared under specific conditions and in specific proportions, consisting of high-purity organic solvents, lithium salt electrolytes, and necessary additives. Electrolyte injection (hereinafter referred to as electrolyte filling) is a key step in the manufacture of cylindrical lithium-ion batteries. The amount of electrolyte injected directly affects the battery's safety performance and capacity.

[0004] Existing automated electrolyte injection equipment is bulky and expensive. While suitable for large-scale production, its application is complex. For a small number of experimental batteries, the cost of automated equipment is prohibitive. Using syringes for injection can lead to uneven electrolyte distribution and air bubbles within the battery, affecting experimental verification. Furthermore, this method is inefficient, especially since different types of electrolytes need to be used for experimental batteries, making it difficult to meet verification requirements. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a lithium-ion battery liquid injection device to improve the processing efficiency and quality of liquid injection into the battery body, in order to address the shortcomings of the prior art.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A lithium-ion battery electrolyte filling device includes an filling tank and a sealing assembly, wherein the sealing assembly is movably fastened to the top of the filling tank, allowing the top of the filling tank to switch between an open state and a closed state. The device is characterized by further including a placement assembly for mounting at least one battery body, and the placement assembly is movably inserted into the filling tank. When the battery body on the placement assembly is placed in the sealed cavity, the electrolyte in the filling tank covers the filling hole of the battery body. After the filling tank and the sealing assembly are closed, a negative pressure pump discharges the air from the sealed cavity, allowing the electrolyte to flow into the battery body.

[0008] This device employs a movable sealing structure with an injection tank and a sealing component. Electrolyte is added to the injection tank, covering the injection hole at the bottom of the battery body. After the tank is closed, a vacuum is drawn into the sealed cavity. Under the vacuum pressure, the electrolyte in the injection tank automatically flows into the battery body through the injection hole of the inverted battery body. After maintaining the vacuum for a certain period of time, the battery is filled with electrolyte. Multiple battery bodies can be filled with electrolyte simultaneously, significantly improving efficiency. Furthermore, there are no air bubbles or empty areas inside the battery body, ensuring quality.

[0009] Preferably, the arrangement assembly includes a bracket and a hoop. The bracket is supported on the bottom of the battery body, and the hoop is bound to the outside of the battery body. Two lead screws are installed on the bracket. The hoop has through holes that correspond one-to-one with the lead screws. Two nuts are sleeved on the outside of each lead screw, and the two nuts are respectively attached to both sides of the hoop. A limiting vertical hole is passed through the hoop, and a restraining collar is installed in the limiting vertical hole. The battery body is inserted into the restraining collar.

[0010] Preferably, the hoop plate has multiple upper limit vertical holes, and the multiple upper limit vertical holes are arranged in a ring array around the axis of the hoop plate. The battery body is arranged one-to-one with the multiple upper limit vertical holes and the restraining rings inside them.

[0011] The bracket has an injection channel at its axis and a limiting groove communicating with the injection channel on the inner side of the top of the bracket. The number and position of the limiting grooves correspond one-to-one with the multiple limiting vertical holes after assembly. This allows one end of the rivet terminal of the battery body to be inserted into the limiting groove, and exposes the injection hole of the battery body.

[0012] The bracket is provided with at least one support plate inside the liquid injection channel to support the battery body installed at the center of the bracket axis.

[0013] Preferably, a positioning element is threaded onto the top of the lead screw, and a pin hole is passed through the outer side of the positioning element. A lifting metal strip is rotatably connected between the two positioning elements through the pin hole.

[0014] Preferably, at least one liquid groove is passed through the hoop, and the inner diameter of the through hole is larger than the outer diameter of the lead screw.

[0015] Preferably, the inner diameter of the restraining ring matches the outer diameter of the battery body, and the restraining ring is made of rubber.

[0016] Preferably, the sealing assembly includes a top cover, with a card seat and a Z-shaped locking plate fixedly connected to both sides of the top cover, and a card plate and a positioning plate fixedly connected to both sides of the top of the injection tank, with the card seat and card plate correspondingly sleeved and forming a hinge structure through a pin. The positioning plate has a sliding groove, and a stop shaft is slidably connected between the sliding grooves of the two positioning plates, which cooperates with the Z-shaped locking plate to be movably pressed onto the Z-shaped locking plate.

[0017] Preferably, at least one gasket is detachably provided on the inner bottom of the injection tank, and a sealing ring is provided on the inner outer ring of the top cover, and both the gasket and the sealing ring are made of rubber material.

[0018] Preferably, the top cover is provided with an exhaust port that extends into the interior of the injection tank, and the top of the exhaust port is connected to the input end of the negative pressure pump via an air supply pipe.

[0019] Preferably, the bottom of the injection tank is provided with at least three pads, and a gap is reserved between two adjacent pads;

[0020] The bottom of the injection tank is provided with a drain port that extends into the inside of the injection tank, and an infusion pipe is connected to the bottom of the drain port, with a valve installed inside the infusion pipe.

[0021] Preferably, the top cover is provided with a pressure sensor and a microcontroller, wherein the pressure sensor is used to sense the air pressure inside the injection tank, and the input and output terminals of the microcontroller are respectively connected to an A / D converter and a D / A converter, and the pressure sensor is electrically connected to the A / D converter, and the negative pressure pump is electrically connected to the D / A converter.

[0022] This utility model has the following beneficial effects:

[0023] Multiple battery cells are arranged in a configuration using an array of components and then placed into a sealed space consisting of an electrolyte filling tank and a sealing assembly. The electrolyte is submerged in the filling holes of the battery cells. After evacuation, the electrolyte automatically flows from the filling holes of the inverted battery cells into the interior of the cells under vacuum pressure, wetting the electrodes until the electrolyte filling is complete. Multiple battery cells are filled with electrolyte, making full use of space and processing multiple battery cells at once. This device has a simple structure, is easy to carry, and is convenient to use. It can be used for experimental battery DOE verification for different types of electrolytes.

[0024] By designing a movable structure for the closed component, the stop shaft slides forward within the groove, and then the top cover is lowered so that its bottom fits against the top of the injection tank. The sealing ring is pressed against the opening of the injection tank, thus ensuring a sealed space between the injection tank and the top cover. Pushing the stop shaft backward presses it against the Z-shaped locking plate, which locks the top cover in place. This design is convenient and quick to use, ensures the sealing of the structure, and improves work efficiency.

[0025] By adding a gasket inside the injection tank, the bracket is supported, forming a step for placing the lithium-ion battery. This ensures that the bottom of the injection hole in the battery body is not blocked, thus guaranteeing smooth electrolyte replenishment. Furthermore, the height of the battery fixing step is greater than the height of the rivet terminal. When the battery is fixed in the groove, the electrolyte can flow at the bottom of the battery, so that it can flow smoothly into the battery body from the injection hole.

[0026] By selecting and setting the arrangement of components and the number of gaskets, the initial height of lithium-ion battery installation can be limited according to actual needs. This makes it suitable for the liquid filling process of lithium-ion batteries of different specifications. Furthermore, the material of the gaskets meets the requirements for cushioning and impact protection, thereby improving the stability and safety of lithium-ion battery processing. Attached Figure Description

[0027] Figure 1 This is a first-view perspective perspective view of the overall structure of the lithium-ion battery liquid injection device provided by this utility model.

[0028] Figure 2 This is a second-view perspective perspective view of the overall structure of the lithium-ion battery liquid injection device provided by this utility model.

[0029] Figure 3 This is a front view of the lithium-ion battery liquid injection device provided by this utility model.

[0030] Figure 4 This is a utility model Figure 3 Sectional view along the AA direction.

[0031] Figure 5 This is a schematic diagram of one embodiment of the arrangement components and the battery body in this utility model.

[0032] Figure 6 This is a utility model Figure 5 The structure shown is an exploded view from a first-person perspective.

[0033] Figure 7 This is a utility model Figure 5 The structure shown is an exploded view from a second perspective.

[0034] Figure 8 This is a perspective view of the closed component in this utility model.

[0035] Figure 9 This is an exploded view of the closed component in this utility model.

[0036] Figure 10 This is the system control flowchart of the intelligent control system in this utility model.

[0037] Among them are:

[0038] Injection tank-1; Sealing assembly-2; Negative pressure pump-3; Arrangement assembly-4; Gasket-5; Sealing ring-6; Vent port-7; Pad block-8; Drain port-9; Infusion tube-10; Pressure sensor-11; Microcontroller-12;

[0039] Bracket-41; Hoop plate-42; Lead screw-43; Through hole-44; Nut-45; Restraining collar-46; Limiting groove-47; Support plate-48; Positioning component-49; Pin hole-410; Lifting metal strip-411; Lower liquid tank-412;

[0040] Top cover - 21; Card slot - 22; Z-shaped locking plate - 23; Card plate - 24; Positioning plate - 25; Pin - 26; Slide groove - 27; Stop shaft - 28;

[0041] Battery body - a; Rivet terminal - b; Fluid injection hole - c. Detailed Implementation

[0042] The present invention will now be described in further detail with reference to the accompanying drawings and specific preferred embodiments.

[0043] In the description of this utility model, it should be understood that the terms "left side," "right side," "upper part," "lower part," 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 utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. "First," "second," etc., do not indicate the importance of the components, and therefore should not be construed as a limitation of this utility model. The specific dimensions used in this embodiment are only for illustrating the technical solution and do not limit the protection scope of this utility model.

[0044] like Figure 1-9 As shown, a lithium-ion battery electrolyte filling device includes an electrolyte filling tank 1 and a sealing component 2, wherein the sealing component 2 is movably fastened to the top of the electrolyte filling tank 1, so that the top of the electrolyte filling tank 1 can switch between an open state and a closed state. The device is characterized in that it also includes an arrangement component 4 for installing at least one battery body a, and the arrangement component 4 is movably inserted into the inside of the electrolyte filling tank 1. When the battery body a on the arrangement component 4 is placed in the sealed cavity, the electrolyte in the electrolyte filling tank 1 covers the electrolyte filling hole c of the battery body a. After the electrolyte filling tank 1 and the sealing component 2 are closed, the air in the sealed cavity is discharged by a negative pressure pump 3 so that the electrolyte flows into the battery body a.

[0045] The arrangement component 4 includes a bracket 41 and a clamp plate 42. The bracket 41 is supported on the bottom of the battery body a, and the clamp plate 42 is restrained on the outside of the battery body a. Two lead screws 43 are installed on the bracket 41. The clamp plate 42 has through holes 44 that correspond one-to-one with the lead screws 43. Two nuts 45 are sleeved on the outside of each lead screw 43, and the two nuts 45 are respectively attached to both sides of the clamp plate 42. The clamp plate 42 has a limiting vertical hole, and a restraining collar 46 is installed in the limiting vertical hole. The battery body a is inserted into the restraining collar 46. The bracket 41 and the clamp plate 42 cooperate to limit and arrange the battery body a, improving the stability of the battery body a installation. The position of the clamp plate 42 on the lead screws 43 is adjustable. After adjustment, it is locked with two nuts 45. Adjusting the distance between the bracket 41 and the clamp plate 42 can be used for battery bodies a of different specifications.

[0046] Specifically, in the above technical solution, the hoop 42 has multiple upper limit vertical holes, and these holes are arranged in a ring array around the axis of the hoop 42. The multiple upper limit vertical holes and their internal restraining rings 46 correspond one-to-one with the battery body a. An injection channel is provided at the axis of the bracket 41, and a limiting groove 47 communicating with the injection channel is provided on the inner side of the top of the bracket 41. The number and position of the limiting grooves 47 correspond one-to-one with the multiple upper limit vertical holes after assembly. One end of the rivet terminal b of the battery body a is inserted into the limiting groove 47, exposing the injection hole c of the battery body a. At least one support plate 48 is provided on the inner side of the injection channel of the bracket 41 to support the battery body a installed at the axis of the bracket 41. The design of the bracket 41, the hoop 42, and their upper limit structure can be set according to the actual production situation. This embodiment shows a style for processing seven battery bodies a of the same specification at the same time, but it is not limited to this. Other arrangements and combinations based on the basic principle are also possible.

[0047] Specifically, in the above technical solution, the top of the lead screw 43 is threaded with a positioning member 49, and the outer side of the positioning member 49 has a pin hole 410. The two positioning members 49 are rotatably connected by a lifting metal strip 411 through the pin hole 410. The lifting metal strip 411 is used to facilitate the placement and removal of the arrangement assembly 4 with the battery body a. The lifting metal strip 411 is movable, which makes it easy to fold after entering the liquid injection tank 1, so as to avoid interfering with the fastening of the sealing assembly 2.

[0048] Specifically, in the above technical solution, at least one liquid groove 412 is passed through the hoop plate 42, and the inner diameter of the through hole 44 is larger than the outer diameter of the lead screw 43, so that the through hole 44 and the lead screw 43 do not contact each other, thus preventing wear and making height adjustment smoother.

[0049] Specifically, in the above technical solution, the inner diameter of the restraining ring 46 matches the outer diameter of the battery body a, and the restraining ring 46 is made of rubber, which has a limiting and protective effect on the battery body a. During installation, its friction on the battery body a is large, making the battery body a less prone to sliding, and providing a buffering and protective force.

[0050] Specifically, in the above technical solution, the sealing component 2 includes a top cover 21, with a card seat 22 and a Z-shaped locking plate 23 fixedly connected to both sides of the top cover 21, and a card plate 24 and a positioning plate 25 fixedly connected to both sides of the top of the liquid injection tank 1, with the card seat 22 and the card plate 24 correspondingly sleeved and forming a hinge structure through the pin 26. The positioning plate 25 has a sliding groove 27, and a stop shaft 28 is slidably connected between the sliding grooves 27 of the two positioning plates 25, which cooperates with the Z-shaped locking plate 23 to be movably pressed on the Z-shaped locking plate 23.

[0051] During operation, first slide the stop shaft 28 forward in the slide groove 27, then lower the top cover 21 so that its bottom fits against the top of the injection tank 1. The sealing ring 6 is pressed against the opening of the injection tank 1, thus ensuring that a sealed space is formed between the injection tank 1 and the top cover 21. Push the stop shaft 28 backward so that it presses against the Z-shaped locking plate 23, thereby locking the top cover 21. It is convenient and quick to use, ensures the sealing of the structure, and improves work efficiency.

[0052] As another embodiment of the sealing component 2 in this application, the purpose of quick installation can also be achieved by connecting the top cover 21 to the liquid injection tank 1 through a snap-fit ​​connection.

[0053] Specifically, in the above technical solution, at least one gasket 5 is removable on the inner bottom of the injection tank 1, and a sealing ring 6 is provided on the outer ring of the inner side of the top cover 21. Both the gasket 5 and the sealing ring 6 are made of rubber, so that the top cover 2 and the injection tank 1 can be sealed and matched in the closed state. The structure of the gasket 5 can support the bracket 41, forming a step for placing the lithium-ion battery, so that the bottom of the injection hole c of the lithium-ion battery is not blocked, thereby ensuring smooth injection. Moreover, the number of gaskets 5 can be set according to actual needs, thereby limiting the initial height of the lithium-ion battery installation. It is suitable for the injection processing of lithium-ion batteries of different specifications, and the material of the gasket 5 meets the requirements of cushioning and anti-collision effect, improving the stability and safety of lithium-ion battery processing.

[0054] Specifically, in the above technical solution, the top cover 21 is provided with an exhaust port 7 that extends into the inside of the liquid injection tank 1, and the top of the exhaust port 7 is connected to the input end of the negative pressure pump 3 through a gas supply pipe. The negative pressure pump 3 is controlled to work and exhaust air outward through the gas supply pipe. Under negative pressure, the electrolyte will automatically flow into the battery from the liquid injection hole c of the inverted battery body a under the action of atmospheric pressure after vacuuming.

[0055] Specifically, in the above technical solution, at least three pads 8 are provided at the bottom of the injection tank 1, with a gap reserved between two adjacent pads 8 to provide space for the infusion pipe 10; a drain port 9 is provided at the bottom of the injection tank 1, which extends into the interior of the injection tank 1, and the infusion pipe 10 is connected to the bottom of the drain port 9; a valve is provided inside the infusion pipe 10, and the electrolyte in the injection tank 1 is transported by controlling the opening and closing of the valve and the pump at the end, the electrolyte level is adjusted, and the electrolyte can be replaced and cleaned.

[0056] like Figure 10 As shown, a pressure sensor 11 and a microcontroller 12 are provided on the top cover 21. The pressure sensor 11 is used to sense the air pressure inside the liquid injection tank 1. The input and output terminals of the microcontroller 12 are respectively connected to an A / D converter and a D / A converter. The pressure sensor 11 is electrically connected to the A / D converter, and the negative pressure pump 3 is electrically connected to the D / A converter. The pressure sensor 11 senses the air pressure signal inside the liquid injection tank 1 in real time and feeds it back to the microcontroller 12. After being converted into a digital signal, it is compared with the set pressure value. When the set pressure value is reached, the negative pressure pump 3 is controlled to stop working.

[0057] The working principle of this device is as follows:

[0058] Based on the needs of the battery experiment and referring to the specifications and quantity requirements of the experimental battery body a, the corresponding arrangement component 4 is designed, taking the one-time completion of 7 33mm diameter batteries given in this application as an example:

[0059] First, arrange multiple battery bodies a on the arrangement assembly 4. Use the limiting vertical holes on the hoop plate 42 and the restraining collar 46 installed inside to position and install the battery bodies a. After insertion, align the rivet terminal b at the bottom of the battery body a and snap it into the limiting groove 47 on the bracket 41. Further adjust the distance between the hoop plate 42 and the bracket 41 to make the placement of the battery body a more stable. After installation, it is ready for use.

[0060] A certain height of electrolyte is injected into the injection tank 1 so that it can submerge the injection hole c of the battery body a. A gasket 5 is added to the bottom of the inner side of the injection tank 1 to support the bracket 41, forming a step for placing the battery body a, so that the bottom of the injection hole c is not blocked, thereby ensuring smooth electrolyte replenishment.

[0061] Using the lifting metal strip 411, the arrangement assembly 4 containing the battery body a is placed into the liquid injection tank 1, the sealing assembly 2 is closed and locked, and then the negative pressure pump 3 is started to discharge air. Under negative pressure, the electrolyte will automatically flow into the battery from the liquid injection hole c of the inverted battery body a under the action of atmospheric pressure after vacuuming.

[0062] During the process of the negative pressure pump 3 venting air, the pressure sensor 11 senses the air pressure signal inside the liquid injection tank 1 in real time and feeds it back to the microcontroller 12. After being converted into a digital signal, it is compared with the set pressure value. When the set pressure value is reached, the negative pressure pump 3 is controlled to stop working.

[0063] After the electrolyte filling is completed, open the valve to release the negative pressure in the filling tank 1, allowing the electrolyte to be discharged. After the negative pressure in the filling tank 1 changes, the top cover 21 can be easily opened, allowing the battery body a and the arrangement assembly 4 to be removed and replaced.

[0064] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A lithium-ion battery liquid filling device, comprising a liquid filling tank (1) and a sealing component (2), wherein the sealing component (2) is movably fastened to the top of the liquid filling tank (1), allowing the top of the liquid filling tank (1) to switch between an open state and a closed state, characterized in that: It also includes a layout assembly (4) for mounting at least one battery body (a), and the layout assembly (4) is movably inserted into the inside of the injection tank (1). When the battery body (a) on the layout assembly (4) is placed in the closed cavity, the electrolyte in the injection tank (1) covers the injection hole (c) of the battery body (a). After the injection tank (1) and the sealing assembly (2) are closed, the air in the closed cavity is discharged by the negative pressure pump (3) so that the electrolyte flows into the battery body (a).

2. The liquid injection device for lithium ion battery according to claim 1, wherein: The arrangement component (4) includes a bracket (41) and a hoop (42). The bracket (41) is supported on the bottom of the battery body (a), and the hoop (42) is bound to the outside of the battery body (a). Two lead screws (43) are installed on the bracket (41), and through holes (44) corresponding to the lead screws (43) are opened on the hoop (42). Two nuts (45) are sleeved on the outside of each lead screw (43), and the two nuts (45) are respectively attached to the two sides of the hoop (42). A limiting vertical hole is passed through the hoop (42), and a restraining collar (46) is installed in the limiting vertical hole. The battery body (a) is inserted into the restraining collar (46).

3. The liquid injection device for lithium ion battery according to claim 2, characterized in that: The hoop (42) has multiple upper limit vertical holes, and the multiple upper limit vertical holes are arranged in a ring array around the axis of the hoop (42). The battery body (a) is arranged one-to-one with the multiple upper limit vertical holes and the restraining rings (46) inside them. The bracket (41) has an injection channel at its axis and a limiting groove (47) communicating with the injection channel is provided on the inner side of the top of the bracket (41). The number and position of the limiting grooves (47) correspond one-to-one with the multiple limiting vertical holes after assembly. This allows one end of the rivet terminal (b) of the battery body (a) to be inserted into the limiting groove (47) and exposes the injection hole (c) of the battery body (a). The bracket (41) is provided with at least one support plate (48) inside the liquid injection channel to support the battery body (a) installed at the axis of the bracket (41).

4. The liquid injection device for lithium ion battery according to claim 2, characterized in that: The top of the lead screw (43) is threaded with a positioning element (49), and a pin hole (410) is passed through the outside of the positioning element (49). A lifting metal strip (411) is rotatably connected between the two positioning elements (49) through the pin hole (410).

5. The liquid injection device for lithium ion battery of claim 2, wherein: At least one liquid groove (412) is passed through the hoop plate (42), and the inner diameter of the through hole (44) is larger than the outer diameter of the lead screw (43); The inner diameter of the restraint ring (46) matches the outer diameter of the battery body (a), and the restraint ring (46) is made of rubber.

6. The liquid injection device for lithium ion battery according to claim 1, characterized in that: The sealing component (2) includes a top cover (21), on which a card seat (22) and a Z-shaped locking plate (23) are fixedly connected respectively. The top of the liquid injection tank (1) is fixedly connected to a card plate (24) and a positioning plate (25) on which the card seat (22) and the card plate (24) are respectively sleeved and connected together by a pin (26) to form a hinge structure. The positioning plate (25) has a sliding groove (27), and a stop shaft (28) is slidably connected between the sliding grooves (27) of the two positioning plates (25), which cooperates with the Z-shaped locking plate (23) to press it on the Z-shaped locking plate (23).

7. The liquid injection device for lithium ion battery according to claim 6, characterized in that: At least one gasket (5) is detachably provided on the inner bottom of the injection tank (1), and a sealing ring (6) is provided on the inner outer ring of the top cover (21), and both the gasket (5) and the sealing ring (6) are made of rubber material.

8. The liquid injection device for lithium ion battery of claim 6, wherein: The top cover (21) is provided with an exhaust port (7) that extends into the liquid injection tank (1), and the top of the exhaust port (7) is connected to the input end of the negative pressure pump (3) through a gas transmission pipe.

9. The liquid injection device for lithium ion battery according to claim 1, characterized in that: The bottom of the injection tank (1) is provided with at least three pads (8), and a gap is reserved between two adjacent pads (8); The bottom of the injection tank (1) is provided with a drain port (9) that extends into the interior of the injection tank (1), and the bottom of the drain port (9) is connected to a delivery pipe (10), and a valve is provided inside the delivery pipe (10).

10. A lithium-ion battery electrolyte filling device according to claim 6, characterized in that: The top cover (21) is equipped with a pressure sensor (11) and a microcontroller (12). The pressure sensor (11) is used to sense the air pressure inside the injection tank (1). The input and output terminals of the microcontroller (12) are respectively connected to an A / D converter and a D / A converter. The pressure sensor (11) is electrically connected to the A / D converter, and the negative pressure pump (3) is electrically connected to the D / A converter.

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