Liquid injection device

Abstract

The utility model provides a liquid injection device, which relates to the technical field of batteries and comprises a liquid injection cup, a circulating power device and a solvent container. The liquid injection cup is provided with a liquid inlet hole and a liquid outlet hole. The circulating power device is provided with an output port and a backflow port, the output port is communicated with the liquid inlet hole, and the backflow port is communicated with the liquid outlet hole. And the solvent container is communicated with the circulating power device and is filled with a solvent of the electrolyte. The electrolyte can generate crystals after being in contact with outside air, and the crystals can be attached to the interior of the liquid injection cup, so that the normal use of the liquid injection cup can be influenced. When the liquid injection device is adopted, a closed circulation loop can be formed. The solvent can be continuously injected into the liquid injection cup through the circulation loop. After multiple cycles, the crystal can be completely cleaned. Therefore, the liquid injection device can simplify the cleaning work of the crystal and improve the efficiency of cleaning the crystal.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, specifically relating to a liquid injection device. Background Technology

[0002] Power batteries are essential components in the production of electric vehicles, and the production of power batteries requires battery cells. During the cell production process, electrolyte needs to be injected into the cell, and an injection cup is used for this process. When injecting electrolyte, the outlet at the bottom of the injection cup is connected to the injection port at the top of the cell casing. The top of the injection cup is equipped with an inlet port and a vent. The inlet port is used to supply electrolyte from the outside into the injection cup. After the electrolyte flows into the injection cup from the outside through the inlet port, it then enters the cell casing through the outlet port and the injection port.

[0003] After the electrolyte is injected into the cell housing through the injection cup, the electrode plates and separator are partially immersed in the electrolyte. Next, the electrode plates need to be wetted. To accelerate the speed at which the electrolyte wets the electrode plates through the separator, the gas pressure inside the cell housing is typically increased and decreased by alternately introducing and releasing air through the vent holes at the top of the injection cup.

[0004] The electrolyte mentioned above is generally composed of dimethyl carbonate as an organic solvent and lithium hexafluorophosphate as a solute. During the process of the electrolyte entering the cell casing through the inlet hole at the top of the filling cup, it comes into contact with the outside air, resulting in crystal formation. These crystals adhere to the opening of the vent, causing blockage when gas escapes through the vent, thus creating a higher internal pressure than external pressure. After filling a cell, when the filling cup and cell casing are separated, electrolyte sprays from the outlet hole of the filling cup onto the surface of the cell casing, contaminating the cell surface.

[0005] To prevent contamination of the battery cell surface and ensure the proper functioning of the filling cup, the crystals inside the filling cup need to be cleaned regularly.

[0006] In the existing technology, in order to clean the crystals inside the injection cup, it is generally necessary to disassemble the injection cup, which makes the cleaning work cumbersome and thus results in low cleaning efficiency. Utility Model Content

[0007] The purpose of this utility model embodiment is to provide a liquid injection device. When the electrolyte in the injection cup crystallizes, the corresponding solvent can be circulated into the injection cup by a circulating power device to remove the crystals in the injection cup. This avoids the pores of the injection cup being blocked by the crystals, thus simplifying the cleaning work of the injection cup and improving the cleaning efficiency.

[0008] To achieve the above objectives, this utility model is implemented as follows:

[0009] This utility model provides a liquid injection device, which includes an injection cup, a circulation power unit, and a solvent container. The injection cup has an inlet and an outlet. The circulation power unit has an output port and a reflux port; the output port communicates with the inlet port, and the reflux port communicates with the outlet port. The solvent container is connected to the circulation power unit and contains the electrolyte solvent.

[0010] Optionally, the liquid injection device further includes a gas device, and the liquid injection cup is provided with an air hole;

[0011] The gas device is connected to the vent and is used to fill the injection cup with gas or to discharge the gas inside the injection cup.

[0012] Optionally, the injection device further includes a return pipe that connects the outlet hole to the return port, and the return pipe is equipped with a pressure gauge.

[0013] Optionally, the injection device further includes a control valve, which includes an inlet, a first outlet, and a second outlet. The inlet is connected to a section of the reflux pipe near the outlet, the first outlet is connected to a section of the reflux pipe away from the outlet, and the second outlet is connected to the pressure gauge.

[0014] The inlet can be switched to be connected to either the first outlet or the second outlet.

[0015] Optionally, the liquid injection device further includes a cell mold, which is connected to the liquid outlet and the return pipe.

[0016] Optionally, the gas device is an inert gas pump.

[0017] Optionally, the number of injection cups may be multiple.

[0018] Optionally, the injection device further includes a drive device and a base, wherein the drive device is connected to the base and the injection cup is connected to the drive device.

[0019] Optionally, the driving device includes a piston and a cylinder, the cylinder being connected to the base, and the injection cup being connected to the piston.

[0020] Optionally, the liquid injection device further includes a cell clamp, which is connected to the base.

[0021] In this embodiment, the liquid injection device includes an injection cup, a circulation power unit, and a solvent container. The injection cup has an inlet and an outlet. The circulation power unit has an output port and a reflux port; the output port communicates with the inlet port, and the reflux port communicates with the outlet port. The solvent container is connected to the circulation power unit and contains the solvent of the electrolyte. When the electrolyte comes into contact with outside air, it will crystallize, and these crystals will adhere to the inside of the injection cup, thus affecting the normal use of the injection cup.

[0022] When the above-described electrolyte injection device is used to add electrolyte to the battery cell, the injection cup is equipped with an inlet and an outlet, and the circulation power device is equipped with an output port and a return port. The output port is connected to the inlet, and the return port is connected to the outlet. This forms a closed circulation loop. Next, the solvent container, which contains the electrolyte solvent, is connected to the circulation power device. The solvent corresponding to the electrolyte can be continuously injected into the injection cup through the aforementioned circulation loop. After the solvent dissolves the crystals, it can flow out of the injection cup. After multiple cycles, the crystals can be completely dissolved by the solvent, meaning the crystals can be completely cleaned. Therefore, this electrolyte injection device simplifies the crystal cleaning process and improves the efficiency of crystal cleaning.

[0023] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more obvious and understandable, specific embodiments of this utility model are given below. Attached Figure Description

[0024] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0025] Figure 1 This is a schematic diagram of the structure of a liquid injection device provided in an embodiment of this utility model;

[0026] Figure 2 yes Figure 1 A cross-sectional view of the injection cup after it has been cut by a plane passing through its own axis;

[0027] Figure 3 yes Figure 1 A top view of the injection cup in the middle;

[0028] Figure 4 yes Figure 1 A schematic diagram of the control valve connected to the return pipe;

[0029] Figure 5 This is a schematic diagram of the liquid injection device, which includes the drive unit and the base.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1-Injection cup, 101-Inlet hole, 102-Outlet hole, 103-Air hole, 104-Cup rod, 105-Cylinder inner baffle, 106-Sealing rod, 2-Circulation power unit, 201-Outlet port, 202-Return port, 3-Solvent container, 4-Gas device, 5-Return pipe, 6-Pressure gauge, 7-Outlet pipe, 8-Control valve, 801-Inlet, 802-First outlet, 803-Second outlet, 9-Cell mold, 10-Drive device, 1001-Piston, 1002-Cylinder body, 11-Base, 12-Cell clamp, 100-Injection device, G-Cell outer shell. Detailed Implementation

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

[0033] The terms "first," "second," etc., used in the specification and claims of this utility model are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this utility model can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, the first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0034] The liquid injection device provided by the present invention will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0035] Figure 1 This is a schematic diagram of the structure of a liquid injection device 100 provided in an embodiment of the present invention. Figure 2 yes Figure 1 The cross-sectional view formed after the injection cup 1 is cut by a plane passing through its own axis. Figure 3 yes Figure 1 Top view of injection cup 1 in the image.

[0036] See Figure 1 , Figure 2 and Figure 3The liquid injection device 100 includes an injection cup 1, a circulation power unit 2, and a solvent container 3. The injection cup 1 is provided with an inlet 101 and an outlet 102. The circulation power unit 2 is provided with an outlet 201 and a return port 202; the outlet 201 communicates with the inlet 101, and the return port 202 communicates with the outlet 102. The solvent container 3 is connected to the circulation power unit 2 and contains the electrolyte solvent. When the electrolyte comes into contact with outside air, it will crystallize, and these crystals will adhere to the inside of the injection cup 1, thus affecting the normal use of the injection cup 1.

[0037] When the electrolyte is added to the battery cell using the aforementioned electrolyte injection device 100, the injection cup 1 is equipped with an inlet hole 101 and an outlet hole 102, and the circulation power device 2 is equipped with an outlet port 201 and a return port 202. The outlet port 201 is connected to the inlet hole 101, and the return port 202 is connected to the outlet hole 102. This forms a closed circulation loop. Next, the solvent container 3 is connected to the circulation power device 2 and contains the electrolyte solvent. Thus, the solvent corresponding to the electrolyte can be continuously injected into the injection cup 1 through the aforementioned circulation loop. After the solvent dissolves the crystals, it can flow out of the injection cup 1. After multiple cycles, the crystals can be completely dissolved by the solvent, meaning the crystals can be completely cleaned. Therefore, the electrolyte injection device 100 simplifies the crystal cleaning process and improves the efficiency of crystal cleaning.

[0038] It should be noted that the electrolyte described above is composed of dimethyl carbonate as an organic solvent and lithium hexafluorophosphate as a solute. As this electrolyte enters the cell casing through the inlet hole 101 at the top of the injection cup 1, it comes into contact with outside air, which can lead to the formation of crystals.

[0039] It should also be noted that when the electrolyte is added to the battery cell, it is first injected from an external container into the injection cup 1 through the inlet hole 101, and then enters the battery cell through the outlet hole 102. During the process of injecting the electrolyte from the external container into the injection cup 1 through the inlet hole 101, the electrolyte will come into contact with air and form crystals.

[0040] It should also be noted that the above-mentioned circulating power device 2 can be a circulating pump or an impeller, or other circulating power device 2. This application embodiment does not limit this.

[0041] It should also be noted that the solvent container 3 mentioned above can be a metal container, a glass container, or a container of other materials, depending on the chemical properties of the solvent. This application does not limit this.

[0042] It should also be noted that injecting electrolyte into the battery cell is an important step in the lithium battery production process. Its main purpose is to inject electrolyte into the battery cell to form ion channels, ensuring that there are enough lithium ions to migrate between the positive and negative electrodes during the charging and discharging process, thus achieving reversible cycling.

[0043] The purpose of injecting electrolyte into the battery cell is to form ion channels inside the cell, ensuring the stability and reliability of battery performance. The specific production process mainly includes the preparation stage, cell pretreatment, electrolyte injection, settling and testing, and subsequent processing.

[0044] The preparation phase includes preparing the electrolyte, injection equipment, and battery cells needed for electrolyte injection, ensuring all equipment and materials meet production requirements. The battery cell pretreatment phase includes cleaning and drying the battery cells to remove impurities and moisture from their surfaces, ensuring a smooth electrolyte injection process. The electrolyte injection operation involves placing the battery cells into the injection equipment and injecting the electrolyte into the cell using an injection pump. Strict control of the injection volume and speed is required to ensure uniform electrolyte distribution within the cell. The settling and testing phase involves allowing the battery cells to stand for a period after injection to allow the electrolyte to fully penetrate the cell. Testing is also required to ensure the injection volume meets design requirements and that there are no air bubbles or leaks inside the cell. The post-treatment phase includes sealing the injected cells to prevent electrolyte leakage and performing other necessary post-treatments, such as aging tests and capacity grouping.

[0045] When filling battery cells with electrolyte, the following precautions must be taken: First, the amount of electrolyte injected must be strictly controlled. Too much or too little electrolyte will affect the battery's performance and stability. Therefore, the amount injected into each cell must be strictly controlled to ensure it meets design requirements. Second, the quality of the electrolyte must meet requirements. Since the quality of the electrolyte directly affects the battery's performance and lifespan, the electrolyte must be rigorously tested and controlled before injection to ensure it meets production requirements. Third, electrolyte leakage must be prevented. Effective measures must be taken during the injection process to prevent electrolyte leakage and avoid pollution and damage to the environment and equipment. Finally, operational safety must be ensured. Cell filling involves high voltage, high temperature, and other hazardous factors; therefore, operational safety must be carefully monitored to ensure the safety of personnel and equipment.

[0046] In summary, electrolyte filling is a crucial step in lithium battery production, and its process flow, key equipment and procedures, as well as precautions, all require careful attention. By optimizing the electrolyte filling process and improving equipment precision, the quality and efficiency of electrolyte filling can be further enhanced, thereby improving the overall performance and reliability of lithium batteries.

[0047] Alternatively, in some embodiments, see Figure 1 , Figure 2 and Figure 3 The liquid injection device 100 also includes a gas device 4, and the liquid injection cup 1 is provided with a vent 103. The gas device 4 is connected to the vent 103 and is used to inflate the liquid injection cup 1 with gas or to expel the gas in the liquid injection cup 1.

[0048] In the battery cell manufacturing process, after the electrolyte is injected into the cell casing through the injection cup 1, the electrode plates and separator are partially immersed in the electrolyte. Next, the electrode plates need to be wetted. To accelerate the speed at which the electrolyte wets the electrode plates through the separator, the gas pressure inside the cell casing is typically increased and decreased by alternately introducing and releasing air through the vent 103 at the top of the injection cup 1.

[0049] Therefore, a gas device 4 is provided in the above-mentioned liquid injection device 100, and an air hole 103 is provided in the liquid injection cup 1. Connecting the gas device 4 and the air hole 103 can achieve the above purpose and accelerate the speed at which the electrolyte wets the electrode through the diaphragm.

[0050] When the injection cup 1 is equipped with a vent 103, the crystals formed by the electrolyte will adhere to the opening inside the vent 103. The aforementioned circulation loop can also clean the crystals adhering to the opening inside the vent 103. This ensures that the vent 103 will not be blocked when gas is discharged, thus preventing the internal gas pressure of the injection cup 1 from exceeding the external gas pressure. Therefore, after completing the electrolyte injection process for one battery cell, when separating the injection cup 1 from the battery cell casing, electrolyte will not spray from the outlet 102 of the injection cup 1 onto the surface of the battery cell casing, preventing contamination of the battery cell surface.

[0051] It should be noted that the gas device 4 mentioned above can be an air pump or an air cylinder, or other gas devices 4 with the same function. This application embodiment does not limit this.

[0052] See Figure 2 and Figure 3 The aforementioned injection cup 1 includes an upper cylindrical body and a lower conical body. The tip of the conical body points downwards, and the liquid outlet 102 is located at the tip of the conical body. A cup rod 104 is arranged along the axis of the cylindrical body. To prevent the electrolyte from being released when the gas inside the battery cell is released, a cylinder inner baffle 105 is provided inside the injection cup 1. The cylinder inner baffle 105 is fixedly connected to the cup rod 104 and spaced apart from the inner wall of the injection cup 1, forming a gap. In this way, the crystals formed by the electrolyte mainly adhere to this gap. In addition, a sealing rod 106 is provided at the liquid inlet 101 of the injection cup 1. The sealing rod 106 can be detachably connected to the liquid inlet 101.

[0053] Alternatively, in some embodiments, see Figure 1 , Figure 2 and Figure 3 The injection device 100 also includes a return pipe 5, which connects the outlet hole 102 with the return port 202. The return pipe 5 is equipped with a pressure gauge 6.

[0054] Since the injection cup 1 may leak air during use, it must be replaced if a leakage occurs. To more easily test the airtightness of the injection cup 1, a return pipe 5 is installed between the liquid outlet 102 of the injection cup 1 and the return port 202 of the circulating power device 2, and a pressure gauge 6 is installed on the return pipe 5 to test whether the airtightness of the injection cup 1 meets the requirements.

[0055] When testing the airtightness of the injection cup 1, only the outlet 102 is connected to the pressure gauge 6, not the return port 202. Then, the injection cup 1 is repeatedly and alternately filled and emptied. The airtightness of the injection cup 1 is determined by observing the changes in the pressure gauge 6 during this process. Specifically, if the pressure gauge 6 reading remains unchanged or changes very little after each filling with the same amount of gas, it proves that the injection cup 1 is airtight and can continue to be used. Otherwise, it proves that the injection cup 1 is leaking, and it needs to be replaced.

[0056] It should be noted that the aforementioned barometer 6 can be a mechanical barometer, an electronic barometer, or other types of barometer 6. This application embodiment does not limit this.

[0057] It should also be noted that the leakage rate of the injection cup 1 can be calculated using the aforementioned pressure gauge 6. The specific calculation is based on the change in the reading of the pressure gauge 6 after each filling with the same amount of gas.

[0058] It should also be noted that the liquid injection device 100 also includes an output pipe 7, which connects the liquid inlet 101 to the output port 201.

[0059] Alternatively, in some embodiments, see Figure 1 , Figure 2 , Figure 3 and Figure 4 The liquid injection device 100 also includes a control valve 8, which includes an inlet 801, a first outlet 802, and a second outlet 803. The inlet 801 is connected to a section of the return pipe 5 near the outlet hole 102, the first outlet 802 is connected to a section of the return pipe 5 away from the outlet hole 102, and the second outlet 803 is connected to a pressure gauge 6. The inlet 801 can be switched to be connected to either the first outlet 802 or the second outlet 803.

[0060] In this way, the outlet 102 of the injection cup 1 can only be connected to one of the return port 202 or the pressure gauge 6. Specifically, when it is necessary to clean the inside of the injection cup 1 through the circulation loop, the second outlet 803 of the control valve 8 is closed. At this time, the outlet 102 of the injection cup 1 is only connected to the return port 202, thus forming a closed circulation loop. When it is necessary to use the pressure gauge 6 to test the airtightness of the injection cup 1, the first outlet 802 of the control valve 8 is closed. At this time, the outlet 102 of the injection cup 1 is only connected to the pressure gauge 6, and the airtightness of the injection cup 1 can be detected by the change in the reading of the pressure gauge 6.

[0061] It should be noted that only one of the first outlet 802 and the second outlet 803 of the control valve 8 can be connected to the inlet 801.

[0062] Alternatively, in some embodiments, see Figure 1 , Figure 2 and Figure 3 The liquid injection device 100 also includes a cell mold 9, which is connected to the liquid outlet 102 and the return pipe 5.

[0063] In this way, when the airtightness of the injection cup 1 is tested using the pressure gauge 6, the gas injected into the injection cup 1 through the gas device 4 first enters the cell mold 9. The inside of the cell mold 9 is a sealed space, which can create a stable air pressure environment, that is, the air pressure is equal everywhere in the sealed space. Compared with the scheme without the cell mold 9, the fluctuation of the pressure gauge 6 reading caused by the airflow can be avoided.

[0064] Alternatively, in some embodiments, see Figure 1 , Figure 2 and Figure 3 Gas device 4 is an inert gas pump.

[0065] The gas supplied to the injection cup 1 via the inert gas pump is an inert gas, and the gas entering the battery cell is also an inert gas. Because inert gases are chemically stable and do not readily react with the electrolyte, the total amount of gas supplied to the injection cup 1 from the gas device 4 is guaranteed to remain unchanged. This avoids excessive fluctuations in the pressure gauge 6 due to a reduction in the amount of gas supplied to the injection cup 1, thus ensuring more accurate airtightness testing results for the injection cup 1.

[0066] Alternatively, in some embodiments, see Figure 1 , Figure 2 and Figure 3There are multiple injection cups 1. Each injection cup 1 is equipped with an inlet hole 101 and an outlet hole 102. Each inlet hole 101 is connected to an outlet 201, and each outlet hole 102 is connected to a return port 202. In this way, a single circulating power device 2 can simultaneously clean the crystals generated inside multiple injection cups 1, thus improving the efficiency of cleaning crystals.

[0067] Furthermore, since the electrolyte injection device 100 includes multiple electrolyte injection cups 1, it can inject electrolyte into multiple battery cells simultaneously, which also improves the efficiency of injecting electrolyte into the battery cells.

[0068] When testing the airtightness of injection cup 1, the pressure gauge 6 can only be connected to the outlet hole 102 of one injection cup 1 at a time, meaning that the pressure gauge 6 can only test the airtightness of one injection cup 1 at a time. When it is necessary to test the airtightness of different injection cups 1, the pressure gauge 6 needs to be switched to be connected to different injection cups 1.

[0069] Alternatively, in some embodiments, see Figure 1 , Figure 2 , Figure 3 and Figure 5 The injection device 100 also includes a drive device 10 and a base 11. The drive device 10 is connected to the base 11, and the injection cup 1 is connected to the drive device 10.

[0070] Thus, the base 11 can be used to support the drive device 10. Next, since the injection cup 1 is connected to the drive device 10, the injection cup 1 can be connected to or separated from the cell housing G under the action of the drive device 10. When the injection cup 1 is connected to the cell housing G, the injection cup 1 injects electrolyte into the cell housing G. After the electrolyte injection is completed, the injection cup 1 separates from the cell housing G under the action of the drive device 10.

[0071] Furthermore, the liquid injection device 100 also includes an automatic controller electrically connected to the drive device 10 for automatically controlling the movement of the drive device 10. This enables the automatic liquid injection function for the battery cells.

[0072] It should be noted that the aforementioned drive device 10 may be a drive cylinder or a drive gear set, or other drive devices 10. This application embodiment does not limit this.

[0073] Alternatively, in some embodiments, see Figure 1 , Figure 2 , Figure 3 and Figure 5The drive device 10 includes a piston 1001 and a cylinder 1002. The cylinder 1002 is connected to the base 11, and the injection cup 1 is connected to the piston 1001. Thus, when the piston 1001 moves relative to the cylinder 1002, it can drive the injection cup 1 to move, thereby allowing the injection cup 1 to connect or separate from the battery cell housing G.

[0074] Since the cylinder block 1002 is a common drive structure, its production and installation technology is relatively mature, and its performance is relatively stable. This results in the drive device 10 having relatively stable performance and a low failure rate, thus improving the efficiency of adding electrolyte to the battery cell.

[0075] It should be noted that the cylinder 1002 mentioned above can be a hydraulic cylinder or a pneumatic cylinder, or it can be other types of cylinder 1002. This application embodiment does not limit this.

[0076] Alternatively, in some embodiments, see Figure 1 , Figure 2 , Figure 3 and Figure 5 The liquid injection device 100 also includes a cell clamp 12, which is connected to the base 11.

[0077] In this way, when using the electrolyte injection device 100 to add electrolyte to the battery cell, the battery cell clamp 12 can hold the battery cell, thereby fixing the battery cell. This makes the connection between the electrolyte injection cup 1 and the battery cell more stable, and can prevent electrolyte leakage due to the electrolyte injection cup 1 detaching from the battery cell.

[0078] Furthermore, when the liquid injection device 100 includes multiple liquid injection cups 1, the corresponding cell clamp 12 also has multiple slots, each slot is used to clamp a cell, the number of slots is the same as the number of liquid injection cups 1, and each slot has a corresponding liquid injection cup 1.

[0079] It should be noted that the connection between the battery cell clamp 12 and the base 11 can be a bolt connection, a snap-fit ​​connection, or other connection methods. This application embodiment does not limit this.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A liquid injection device (100), characterized in that, include: The liquid injection cup (1) is provided with an inlet hole (101) and an outlet hole (102); A circulating power device (2) is provided with an output port (201) and a return port (202). The output port (201) is connected to the liquid inlet (101), and the return port (202) is connected to the liquid outlet (102). A solvent container (3) is connected to the circulating power device (2) and contains an electrolyte solvent.

2. The liquid injection device (100) according to claim 1, characterized in that, The liquid injection device (100) also includes a gas device (4), and the liquid injection cup (1) is provided with a gas hole (103); The gas device (4) is connected to the air hole (103) and is used to fill the liquid cup (1) with gas or to discharge the gas in the liquid cup (1).

3. The liquid injection device (100) according to claim 2, characterized in that, The liquid injection device (100) also includes a return pipe (5), which connects the liquid outlet (102) and the return port (202), and the return pipe (5) is equipped with a pressure gauge (6).

4. The liquid injection device (100) according to claim 3, characterized in that, The liquid injection device (100) further includes a control valve (8), which includes an inlet (801), a first outlet (802), and a second outlet (803). The inlet (801) is connected to a section of the return pipe (5) near the outlet (102), the first outlet (802) is connected to a section of the return pipe (5) away from the outlet (102), and the second outlet (803) is connected to the pressure gauge (6). The inlet (801) can be switched to be connected to either the first outlet (802) or the second outlet (803).

5. The liquid injection device (100) according to claim 3, characterized in that, The liquid injection device (100) also includes a cell mold (9), which is connected to the liquid outlet (102) and the return pipe (5).

6. The liquid injection device (100) according to claim 2, characterized in that, The gas device (4) is an inert gas pump.

7. The liquid injection device (100) according to claim 1, characterized in that, The number of the injection cups (1) is multiple.

8. The liquid injection device (100) according to claim 1, characterized in that, The liquid injection device (100) further includes a driving device (10) and a base (11), wherein the driving device (10) is connected to the base (11) and the liquid injection cup (1) is connected to the driving device (10).

9. The liquid injection device (100) according to claim 8, characterized in that, The drive device (10) includes a piston (1001) and a cylinder (1002), the cylinder (1002) is connected to the base (11), and the injection cup (1) is connected to the piston (1001).

10. The liquid injection device (100) according to claim 8, characterized in that, The liquid injection device (100) further includes a cell clamp (12), which is connected to the base (11).

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