A liquid injection device for an electric cell

Abstract

This invention relates to the field of electrolyte injection technology for battery cells, and discloses an electrolyte injection device for battery cells, including a base and a housing placed thereon; a platform located inside the housing is mounted on the base, a loading frame is mounted on the platform, a support member is provided on the loading frame, and a battery cell is held on the support member; an injection component for evacuating air from the battery cell and switching the electrolyte injection action is mounted on the loading frame, and an air extraction component connected to the injection component is mounted on the platform; when the air extraction component evacuates, the electrolyte injection component closes the channel with the battery cell, opening the channel between the air extraction component and the battery cell, and the air inside the battery cell is extracted by the air extraction component. This invention uses an external air extraction device to directly extract the gas inside the battery cell to form a vacuum, and then relies on gravity and pressure difference to allow the electrolyte to flow in naturally. At the same time, by filling the housing with protective gas during vacuuming to form a high-pressure environment, the internal and external pressure difference is enhanced to improve the vacuuming effect, thereby shortening the electrolyte injection cycle and improving the electrolyte injection quality and efficiency.

Description

Technical Field

[0001] This invention relates to the field of battery cell liquid injection technology, and more particularly to a liquid injection device for battery cells. Background Technology

[0002] As the core energy storage unit of lithium batteries, the battery cell is usually composed of components such as positive electrode material, negative electrode material, separator and shell. Electrolyte needs to be injected into it to form ion conduction channels. In the battery cell manufacturing process, injecting electrolyte into it is a key step to ensure that the battery cell has normal working ability. This process mainly involves injecting electrolyte with specific components into the battery cell shell to fully wet the positive and negative electrode plates and separator, thereby activating the electrochemical reaction inside the battery cell and ensuring the efficient migration and reversible insertion and extraction of lithium ions during charging and discharging.

[0003] A search revealed that Chinese patent CN118825580A discloses a battery cell injection needle and a battery cell injection device, including a base with an injection channel and a mounting hole connected within it; a needle movably disposed within the mounting hole and at least partially extending out of it, the needle sealingly engaging with the mounting hole; the needle having an inlet groove and an injection hole connected to it; the injection hole extending through the inlet groove to the top; and an elastic element. The elastic element is disposed between the base and the needle to selectively drive the needle relative to the base toward the side away from the injection channel, so that the inlet groove and the injection channel are selectively connected. This solution, by placing the elastic element between the base and the needle, allows selective communication between the inlet groove and the injection channel, giving the battery cell injection needle a self-sealing characteristic. After the battery cell injection needle is lifted and separated from the battery cell, the electrolyte can be sealed in the liquid path, thus ensuring injection accuracy. However, the above solution still has shortcomings:

[0004] In existing technologies, the electrolyte injection process for battery cells generally adopts differential pressure or equal pressure injection methods. A positive or negative pressure environment is applied inside the injection cup to drive the electrolyte injection and simultaneously extract the gas inside the battery cell. However, under negative pressure, the air inside the battery cell must overcome the gravity and surface tension of the electrolyte itself to be discharged. This process not only increases the resistance to gas discharge, increases energy consumption, and prolongs the injection cycle, but also easily causes problems such as local liquid shortage or uneven wetting due to incomplete venting.

[0005] To address the aforementioned problems, this application proposes a liquid injection device for battery cells. Summary of the Invention

[0006] This invention proposes a liquid injection device for battery cells, which solves the problems in related technologies where, during negative pressure liquid injection, air inside the battery cell must overcome the gravity and surface tension of the electrolyte to be discharged, resulting in high exhaust resistance, high energy consumption, long cycle, and easy occurrence of local liquid shortage and uneven wetting due to incomplete exhaust.

[0007] The present invention provides a liquid injection device for battery cells, comprising a base and a cover placed thereon;

[0008] The base is equipped with a platform located inside the housing. A loading rack is installed on the platform. A support is provided on the loading rack, and a battery cell is held on the support. A liquid injection component for evacuating the battery cell and switching the liquid injection action is installed on the loading rack. An evacuation component connected to the liquid injection component is installed on the platform.

[0009] When the vacuuming component is drawing a vacuum, the liquid injection component closes the channel between the vacuuming component and the battery cell, opening the channel between the vacuuming component and the battery cell. Air inside the battery cell is drawn out by the vacuuming component. After the vacuuming is completed, the vacuuming component stops working, and the liquid injection component closes the channel between the vacuuming component and the battery cell, connecting the liquid injection component to the battery cell to inject liquid into the battery cell.

[0010] The above methods can effectively reduce gas discharge resistance, shorten the injection cycle, avoid localized lack of liquid or poor wetting, and improve injection quality and efficiency.

[0011] As a further optimization of the present invention, the support includes a support base, a loading rod and a slide rail. The loading rod is installed on the platform below the loading frame, and the slide rail is installed on the loading rod. A sliding opening is formed on the loading frame below the loading block. The support base is inserted into the sliding opening and slides with the slide rail. Multiple slots are provided in the support base. There are multiple battery cells, and the multiple battery cells are respectively inserted into the multiple slots.

[0012] The above-mentioned method facilitates the simultaneous injection of electrolyte into multiple battery cells, improves injection efficiency, and enables batch processing of battery cells.

[0013] As a further optimization of the present invention, the liquid injection assembly includes a loading block, which is mounted on a loading frame and located above a support. The loading block is provided with a plurality of liquid injection switching components, which are respectively located above a plurality of battery cells. An air extraction component is used to connect with the plurality of liquid injection switching components.

[0014] The above-mentioned method achieves synchronized operation of multiple battery cells for gas extraction and liquid injection, ensuring that the processing actions of multiple battery cells are consistent and guaranteeing the uniformity of liquid injection for multiple battery cells.

[0015] As a further optimization of the present invention, the liquid injection switching component includes a liquid injection cylinder, the loading block has multiple storage cavities, each storage cavity is provided with a liquid injection cylinder, the bottom of each liquid injection cylinder is connected to a liquid injection pipe passing through the bottom of the loading block, the multiple liquid injection pipes are respectively aligned with the liquid inlets of multiple battery cells, a three-way valve is installed on the liquid injection pipe, and the air extraction component is connected to the three-way valve.

[0016] The above features allow for flexible switching between air extraction and liquid injection functions, improving operational convenience.

[0017] As a further optimization of the present invention, the bottom end of the injection tube is fitted with a sealing ring that fits against the top of the battery cell and covers its inlet.

[0018] The sealing ring design ensures the sealing of the injected fluid, improving the quality and safety of the injection.

[0019] As a further optimization of the present invention, the air extraction component includes a vacuum tube, a flexible hose, an air guide tube, and a cylinder. The vacuum tube is disposed on one side of the platform and is used to connect to the air extraction pump. The air guide tube is arranged on the loading block and is connected to multiple three-way valves respectively. The air guide tube has an insertion port. The cylinder is mounted on the platform and positioned above the insertion port of the air guide tube. The vacuum tube is connected to a flexible hose, and one end of the flexible hose is connected to a connector fixed to the cylinder. The connector is driven by the cylinder to insert into or pull out of the insertion port on the air guide tube.

[0020] The designed air extraction component enables air extraction from the battery cell, and the cylinder allows for automatic switching of the air extraction path, replacing manual operation and improving the automation level of the equipment.

[0021] As a further optimization of the present invention, the outer periphery of the cover is connected to an inflation tube communicating with its interior, a pressure gauge is installed on the inflation tube, and the inflation tube is used to connect to an inflation device.

[0022] By filling the casing with protective gas, the pressure difference between the inside and outside of the battery cell can be increased, further promoting the rapid discharge of residual gas inside the battery cell, improving the thoroughness of vacuuming, and enhancing the finished performance of the battery cell.

[0023] As a further optimization of the present invention, the top of the base is provided with a rubber ring arranged around the bottom of the platform, and the rubber ring is used to secure the cover on the base to form a seal.

[0024] The rubber ring effectively improves the sealing performance at the connection between the cover and the base, preventing the leakage of protective gas inside the cover and ensuring the stability of the high-pressure environment inside the cover.

[0025] As a further optimization of the present invention, vertically arranged columns are provided on both sides of the base, and sliders are installed on both sides of the cover, with the sliders on both sides slidingly sleeved on the two columns respectively.

[0026] The above-mentioned mechanism allows for the raising and lowering of the cover, making the opening and closing of the cover more convenient.

[0027] As a further optimization of the present invention, a fall arrestor is connected to the top of the cover, and the fall arrestor is used to connect to a fixed object.

[0028] The designed fall arrestor ensures safety when lifting the cover, while also suspending the cover stably in the open position, facilitating operations below.

[0029] The above-described technical solution of the present invention has the following beneficial technical effects:

[0030] 1. First, remove the support from the loading rack within the platform. Then, place the battery cell onto the support and push the support into the loading rack until the bottom of the battery cell is aligned with the liquid injection assembly. Next, place the cover on the base, positioning the battery cell on the platform inside the cover. Then, activate the vacuum pump to perform the vacuuming action. At this time, the liquid injection assembly closes the channel with the battery cell, opening the channel between the vacuum pump and the battery cell. Air is extracted from the battery cell by the vacuum pump. After vacuuming is complete, the vacuum pump stops working, and the liquid injection assembly closes the channel between the vacuum pump and the battery cell. This design connects the electrolyte injection assembly to the battery cell, allowing the liquid inside the assembly to flow into the battery cell under the combined effects of gravity and pressure difference, thus completing the electrolyte injection. This design abandons the traditional method of driving the electrolyte through negative pressure in the electrolyte injection cup. Instead, it uses an external air extraction device to directly extract the gas from the battery cell. After a vacuum is formed inside, the electrolyte flows in naturally by gravity and pressure difference. This effectively reduces the resistance when the gas is discharged, shortens the electrolyte injection cycle, and avoids the problem of local liquid shortage or poor wetting caused by incomplete venting, thus improving the quality and efficiency of electrolyte injection.

[0031] 2. To improve the vacuuming effect inside the battery cell, protective gas can be injected into the casing through the gas filling tube during vacuuming. The amount injected into the casing can be controlled by the pressure gauge on the tube. This allows the battery cell to be vacuumed under a certain high pressure, thus better removing the internal vacuum. The above design, by injecting protective gas into the casing during the vacuuming stage and controlling the gas pressure with a pressure gauge, allows the battery cell to be evacuated under a relatively high pressure environment. This increased pressure difference between the inside and outside further promotes the rapid discharge of residual gas inside the battery cell, improving the vacuuming effect. Attached Figure Description

[0032] Figure 1This is a schematic diagram of the overall structure of a liquid injection device for battery cells proposed in this invention;

[0033] Figure 2 This is a schematic diagram of the cooperative structure of the platform, support, liquid injection assembly and air extraction assembly in this invention;

[0034] Figure 3 This is a schematic diagram of the liquid injection switching component in this invention;

[0035] Figure 4 This is a schematic diagram of the air extraction component in this invention;

[0036] Figure 5 For the present invention Figure 1 A magnified view of A in the middle.

[0037] Reference numerals: 1. Base; 101. Rubber ring; 2. Cover; 21. Inflation pipe; 211. Pressure gauge; 22. Slider; 23. Column; 24. Fall arrestor; 3. Platform; 31. Loading frame; 4. Support component; 41. Support seat; 42. Loading rod; 43. Slide rail; 5. Battery cell; 6. Liquid injection assembly; 61. Loading block; 62. Liquid injection switching component; 621. Liquid injection cylinder; 622. Liquid injection pipe; 623. Three-way valve; 624. Sealing ring; 7. Air extraction component; 71. Vacuum tube; 72. Hose; 721. Connector; 73. Air guide tube; 74. Cylinder. Detailed Implementation

[0038] 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 and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0039] like Figures 1-5 As shown, the present invention provides a liquid injection device for battery cells, comprising a base 1 and a cover 2 placed thereon;

[0040] A platform 3 located inside the housing 2 is installed on the base 1. A loading rack 31 is installed on the platform 3. A support 4 is provided on the loading rack 31, and a battery cell 5 is held on the support 4. A liquid injection component 6 for evacuating the battery cell 5 and switching the liquid injection action is installed on the loading rack 31. An evacuation component 7 connected to the liquid injection component 6 is installed on the platform 3.

[0041] When the vacuuming component 7 draws a vacuum, the liquid injection component 6 closes the channel between the vacuuming component 7 and the battery cell 5, opening the channel between the vacuuming component 7 and the battery cell 5. The air inside the battery cell 5 is drawn out by the vacuuming component 7. After the vacuuming of the battery cell 5 is completed, the vacuuming component 7 stops working, and the liquid injection component 6 closes the channel between the vacuuming component 7 and the battery cell 5, connecting the liquid injection component 6 and the battery cell 5 to inject liquid into the battery cell 5.

[0042] First, the support 4 is pulled out from the loading rack 31 inside the platform 3. The battery cell 5 is then placed on the support 4, and the support 4 is pushed into the loading rack 31 so that the bottom end of the battery cell 5 is aligned with the liquid injection assembly 6. Next, the cover 2 is placed on the base 1 so that the battery cell 5 is placed inside the cover 2. The air extraction component 7 is activated to extract air. At this time, the liquid injection assembly 6 closes the channel with the battery cell 5 and opens the channel with the air extraction component 7 to extract the air from the battery cell 5. After the air extraction is completed, the air extraction component 7 stops working, and the liquid injection assembly 6 closes the channel with the air extraction component 7 and connects the channel with the battery cell 5 to inject liquid. The above effectively reduces the gas discharge resistance, shortens the liquid injection cycle, avoids local liquid shortage or poor wetting problems, and improves the quality and efficiency of liquid injection.

[0043] In this embodiment, the support member 4 includes a support base 41, a loading rod 42 and a slide rail 43. The loading rod 42 located below the loading frame 31 is installed on the platform 3. The slide rail 43 is installed on the loading rod 42. A sliding opening located below the loading block 61 is formed on the loading frame 31. The support base 41 is inserted into the sliding opening and slides in cooperation with the slide rail 43. Multiple slots are opened in the support base 41. There are multiple battery cells 5. The multiple battery cells 5 are respectively inserted into the multiple slots.

[0044] The support 41 slides on the loading rod 42 via the slide rail 43, so as to be pulled out and pushed in from the loading frame 31. Multiple battery cells 5 are respectively inserted into multiple slots in the support 41, which facilitates the simultaneous liquid injection operation of multiple battery cells 5. The above can improve the liquid injection efficiency and enable batch processing of battery cells 5.

[0045] In this embodiment, the liquid injection assembly 6 includes a loading block 61, which is mounted on the loading frame 31 and located above the support 41. The loading block 61 is provided with a plurality of liquid injection switching components 62, which are located above a plurality of battery cells 5 respectively. The air extraction component 7 is used to connect with the plurality of liquid injection switching components 62.

[0046] When the battery cell 5 on the support 41 is pushed into the loading frame 31, multiple liquid injection switching components 62 can correspond to multiple battery cells 5 on the support 41. The vacuum component 7 forms a unified air path connection with all liquid injection switching components 62. The airflow of the vacuum component 7 can enter the corresponding battery cell 5 synchronously through each liquid injection switching component 62, realizing synchronous vacuuming of multiple battery cells 5. During the liquid injection stage, each liquid injection switching component 62 can synchronously inject electrolyte into the corresponding battery cell 5. This structure realizes the synchronous operation of vacuuming and liquid injection of multiple battery cells 5, keeps the processing actions of multiple battery cells 5 consistent, and ensures the uniformity of liquid injection of multiple battery cells 5.

[0047] In this embodiment, the liquid injection switching component 62 includes a liquid injection cylinder 621. The loading block 61 has multiple storage cavities, and each storage cavity is provided with a liquid injection cylinder 621. The bottom of each liquid injection cylinder 621 is connected to a liquid injection pipe 622 that passes through the bottom of the loading block 61. The multiple liquid injection pipes 622 are respectively aligned with the liquid inlets of multiple battery cells 5. A three-way valve 623 is installed on the liquid injection pipe 622. The air extraction component 7 is connected to the three-way valve 623.

[0048] Electrolyte is stored in the injection cylinder 621 and delivered to the battery cell 5 through the injection pipe 622. The three-way valve 623 controls the switching of the channels between the injection pipe 622, the battery cell 5, and the air extraction component 7.

[0049] During the air extraction phase, the three-way valve 623 connects the air extraction component 7 to the battery cell 5 and closes the channel between the liquid injection cylinder 621 and the battery cell 5. During the liquid injection phase, the three-way valve 623 connects the liquid injection cylinder 621 to the battery cell 5 and closes the channel between the air extraction component 7 and the battery cell 5. The above can realize flexible switching between air extraction and liquid injection functions, improving the convenience of operation.

[0050] In this embodiment, the bottom end of the injection tube 622 is fitted with a sealing ring 624 that is attached to the top of the battery cell 5 and covers its inlet.

[0051] After the battery cell 5 is pushed into the loading frame 31, the liquid inlet at the top of the battery cell 5 is aligned with the bottom end of the liquid injection pipe 622, and the sealing ring 624 is fitted with the top of the battery cell 5 to cover the liquid inlet, preventing electrolyte leakage and air entry. The above can ensure the sealing of the liquid injection and improve the quality and safety of the liquid injection.

[0052] In this embodiment, the vacuum pump 7 includes a vacuum tube 71, a hose 72, a guide tube 73, and a cylinder 74. The vacuum tube 71 is located on one side of the platform 3 and is used to connect to the vacuum pump. The guide tube 73 is arranged on the loading block 61 and is connected to multiple three-way valves 623 respectively. The guide tube 73 has an inlet. The cylinder 74 is installed on the platform 3 and is positioned above the inlet of the guide tube 73. The vacuum tube 71 is connected to the hose 72. One end of the hose 72 is connected to a connector 721 fixed to the cylinder 74. The connector 721 is driven by the cylinder 74 to insert into or pull out of the inlet on the guide tube 73.

[0053] During operation, the vacuum tube 71 is connected to the vacuum pump. Before evacuation, the cylinder 74 drives the connector 721 downward to insert into the inlet of the air guide tube 73, so that the vacuum tube 71, hose 72, air guide tube 73 and three-way valve 623 form a complete air path. The vacuum pump evacuates the battery cell 5 through this air path. After evacuation is completed, the cylinder 74 drives the connector 721 upward to pull out the inlet, cutting off the entire evacuation air path. This structure realizes the automatic opening and closing of the evacuation air path through the cylinder 74, replacing manual operation and improving the automation level of the equipment. At the same time, the flexible hose 72 adapts to the lifting and lowering action of the connector 721, avoiding the jamming problem of rigid pipe connection.

[0054] In this embodiment, the outer periphery of the cover 2 is connected to an inflation pipe 21 that communicates with its interior. A pressure gauge 211 is installed on the inflation pipe 21, and the inflation pipe 21 is used to connect to an inflation device.

[0055] During operation, the inflation pipe 21 connects to an external inflation device to deliver protective gas into the housing 2. The pressure gauge 211 monitors the internal pressure of the housing 2 in real time and displays the pressure data according to the operational requirements, making it convenient for operators to control the amount and rate of inflation. During the vacuuming process of the battery cell 5, protective gas is injected into the housing 2 through the inflation pipe 21. The pressure gauge 211 is used to control the internal pressure of the housing 2 within a suitable range, so that the battery cell 5 is in an environment of high external pressure and negative internal pressure. This design increases the pressure difference between the inside and outside of the battery cell 5, further promoting the rapid discharge of residual gas inside the battery cell, improving the thoroughness of vacuuming, and improving the finished performance of the battery cell.

[0056] In this embodiment, a rubber ring 101 is provided on the top of the base 1 and arranged around the bottom of the platform 3, and the rubber ring 101 is used for the cover 2 to be placed on the base 1 to form a seal.

[0057] When the cover 2 is placed on the base 1, the inner wall of the bottom end of the cover 2 will be tightly pressed and contacted with the rubber ring 101. The elastic deformation of the rubber ring 101 fills the gap between the cover 2 and the base 1. This structure can effectively improve the sealing performance of the connection between the cover 2 and the base 1, prevent the leakage of protective gas inside the cover 2, and ensure the stability of the high-pressure environment inside the cover 2.

[0058] In this embodiment, vertically arranged columns 23 are provided on both sides of the base 1, and sliders 22 are installed on both sides of the cover 2. The sliders 22 on both sides are slidably sleeved on the two columns 23 respectively.

[0059] The column 23 is vertically fixed on both sides of the base 1, providing a sliding guide for the slider 22, so that the cover 2 can slide up and down along the column 23 via the slider 22. During operation, sliding the cover 2 upward can open the working space, which is convenient for loading and unloading the battery cell 5 and for debugging and maintenance of the equipment. Sliding the cover 2 downward can lock it onto the base 1 to form a closed working space. This structure realizes the lifting and lowering of the cover 2, making the opening and closing operation of the cover 2 more convenient.

[0060] In this embodiment, a fall arrestor 24 is connected to the top of the cover 2, and the fall arrestor 24 is used to connect to a fixed object;

[0061] During operation, one end of the fall arrestor 24 is connected to the top of the housing 2, and the other end is connected to an external fixed object. When the housing 2 slides upward along the column 23 to the designated position, the fall arrestor 24 can pull and fix the housing 2. This structure can effectively prevent the housing 2 from falling due to the failure of the slider 22 and the column 23 or the action of external force, avoid equipment damage and personnel injury, improve the safety of the equipment operation process, and at the same time, it can stably suspend the housing 2 in the open position, which is convenient for the operator to carry out the operation below.

[0062] In a specific embodiment, the loading frame 31 and the components thereon can be set to a corresponding number of groups according to actual needs for batch liquid injection of the battery cell 5.

[0063] The embodiments of the present invention have been described above, but the embodiments are not limited to the specific implementation methods described above. The specific implementation methods described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the embodiments described above, all of which are within the protection scope of the embodiments described above.

Claims

1. A liquid injection device for battery cells, characterized in that, Includes a base (1) and a housing (2) placed thereon; The base (1) is equipped with a platform (3) located inside the cover (2), the platform (3) is equipped with a loading rack (31), the loading rack (31) is provided with a support (4), and the support (4) holds a battery cell (5). The loading rack (31) is equipped with an injection assembly (6) for evacuating the battery cell (5) and switching the injection action. The platform (3) is equipped with an air extraction component (7) connected to the injection assembly (6). When the vacuuming component (7) draws a vacuum, the liquid injection component (6) closes the channel between the vacuuming component (7) and the battery cell (5), opening the channel between the vacuuming component (7) and the battery cell (5). The air inside the battery cell (5) is drawn out by the vacuuming component (7). After the vacuuming of the battery cell (5) is completed, the vacuuming component (7) stops working, and the liquid injection component (6) closes the channel between the vacuuming component (7) and the battery cell (5), connecting the liquid injection component (6) and the battery cell (5) to inject liquid into the battery cell (5).

2. The electrolyte injection device for battery cells according to claim 1, characterized in that, The support (4) includes a support base (41), a loading rod (42) and a slide rail (43). The platform (3) is equipped with a loading rod (42) located below the loading frame (31). The loading rod (42) is equipped with a slide rail (43). The loading frame (31) has a sliding opening located below the loading block (61). The support base (41) is inserted into the sliding opening and slides with the slide rail (43). The support base (41) has multiple slots. The number of battery cells (5) is multiple, and the multiple battery cells (5) are respectively inserted into the multiple slots.

3. The electrolyte injection device for battery cells according to claim 2, characterized in that, The liquid injection assembly (6) includes a loading block (61), which is mounted on a loading frame (31) and located above a support (41). The loading block (61) is provided with a plurality of liquid injection switching components (62), which are located above a plurality of battery cells (5). An air extraction component (7) is used to connect with the plurality of liquid injection switching components (62).

4. The electrolyte injection device for battery cells according to claim 3, characterized in that, The liquid injection switching component (62) includes a liquid injection cylinder (621). The loading block (61) has multiple storage cavities, each of which is equipped with a liquid injection cylinder (621). The bottom of each liquid injection cylinder (621) is connected to a liquid injection pipe (622) that passes through the bottom of the loading block (61). The multiple liquid injection pipes (622) are respectively aligned with the liquid inlets of multiple battery cells (5). A three-way valve (623) is installed on the liquid injection pipe (622). The air extraction component (7) is connected to the three-way valve (623).

5. The electrolyte injection device for battery cells according to claim 4, characterized in that, The bottom end of the injection tube (622) is fitted with a sealing ring (624) that is attached to the top of the battery cell (5) and covers its inlet.

6. The electrolyte injection device for battery cells according to claim 4, characterized in that, The vacuum pump (7) includes a vacuum tube (71), a hose (72), a duct (73), and a cylinder (74). The vacuum tube (71) is located on one side of the platform (3) and is used to connect to the vacuum pump. The duct (73) is arranged on the loading block (61) and is connected to multiple three-way valves (623). The duct (73) has an inlet. The cylinder (74) is installed on the platform (3) and positioned above the inlet of the duct (73). The vacuum tube (71) is connected to the hose (72). One end of the hose (72) is connected to a connector (721) fixed to the cylinder (74). The connector (721) is driven by the cylinder (74) to insert into or pull out of the inlet on the duct (73).

7. The electrolyte injection device for battery cells according to claim 1, characterized in that, The outer periphery of the cover (2) is connected to an inflation pipe (21) that communicates with its interior. A pressure gauge (211) is installed on the inflation pipe (21), and the inflation pipe (21) is used to connect to an inflation device.

8. The electrolyte injection device for battery cells according to claim 1, characterized in that, The top of the base (1) is provided with a rubber ring (101) arranged around the bottom of the platform (3), and the rubber ring (101) is used to secure the cover (2) on the base (1) to form a seal.

9. A liquid injection device for battery cells according to claim 1, characterized in that, The base (1) has vertically arranged columns (23) on both sides, and the cover (2) has sliders (22) on both sides. The sliders (22) on both sides are slidably sleeved on the two columns (23).

10. A liquid injection device for battery cells according to claim 1, characterized in that, The top of the cover (2) is connected to a fall arrestor (24), and the fall arrestor (24) is used to connect to a fixed object.

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