A lithium battery cell auxiliary liquid injection device and method

Abstract

The application discloses a kind of lithium battery cell auxiliary liquid injection device, including mounting seat, multiple liquid injection stations are equipped on mounting seat, conveying mechanism can be transported to the liquid injection station by cell;Mounting seat is respectively equipped with coarse positioning mechanism and precision positioning mechanism in the position corresponding to each liquid injection station, coarse positioning mechanism is used to position the radial direction of cell, precision positioning mechanism is used to position the axial direction of cell;Mounting seat is equipped with electrolyte tank in the position corresponding to each liquid injection station, the electrolyte tank is communicated with injection needle by electrolyte pipe, and the injection needle is used to inject the cell of corresponding liquid injection station.This scheme is positioned by coarse positioning mechanism to the radial direction of cell, and the axial direction of cell is positioned by precision positioning mechanism, and the cooperation of coarse positioning mechanism and precision positioning mechanism realizes the accurate positioning of cell, and the positioning accuracy meets the high consistency injection requirement, improves the injection effect, and simultaneously, the device can simultaneously realize the injection of multiple cells, and improves injection efficiency.

Description

Technical Field

[0001] This invention relates to the field of lithium battery electrolyte filling technology, specifically to an auxiliary electrolyte filling device and method for lithium battery cells. Background Technology

[0002] With the rapid development of new energy vehicles, energy storage systems, and consumer electronics, lithium-ion batteries, as core energy carriers, face increasingly stringent requirements for manufacturing precision and consistency. In the lithium battery production process, electrolyte injection is a critical step that directly affects the battery's electrochemical performance, cycle life, and safety. The injection process requires the precise injection of a fixed amount of electrolyte into the cell casing. However, current injection processes generally employ rigid clamps for coarse positioning and fixation of the cells, which presents the following technical problems: Rigid clamping can easily cause indentations on the surface of the battery cell casing, bending of the tabs, or even damage to the internal diaphragm. When the conveying mechanism transports the battery cell to the liquid injection station, the battery cell position often shifts or tilts due to vibration, positioning deviation, etc. Traditional positioning methods cannot identify and compensate for such deviations in real time, resulting in unsatisfactory liquid injection effect.

[0003] Therefore, the present invention mainly addresses the above-mentioned technical problems. Summary of the Invention

[0004] To address the existing technical problems, this invention provides an auxiliary liquid injection device and method for lithium battery cells, thereby solving the problem of poor liquid injection effect caused by low positioning accuracy of lithium battery cells during the liquid injection process in the prior art.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution: A lithium battery cell auxiliary liquid injection device includes a mounting base with multiple liquid injection stations, and a conveying mechanism that can transport the battery cell to the liquid injection stations. The mounting base is provided with a coarse positioning mechanism and a fine positioning mechanism corresponding to each of the liquid injection stations. The coarse positioning mechanism is used to radially position the battery cell, and the fine positioning mechanism is used to axially position the battery cell. The mounting base is provided with an electrolyte tank corresponding to each of the liquid injection stations. The electrolyte tank is connected to the liquid injection needle through an electrolyte tube. The liquid injection needle is used to inject liquid into the battery cell at the corresponding liquid injection station.

[0006] The above technical solution uses a coarse positioning mechanism for radial positioning of the battery cell and a fine positioning mechanism for axial positioning of the battery cell, achieving precise positioning of the battery cell, avoiding shaking of the battery cell during the liquid injection process, and improving the liquid injection effect. At the same time, this device can simultaneously inject liquid into multiple battery cells, improving the liquid injection efficiency.

[0007] Furthermore, the mounting base is equipped with several positioning detection sensors, which are used to detect whether the battery cell has reached the liquid injection station.

[0008] Furthermore, two sets of coarse positioning mechanisms are provided for each of the injection stations, and the two sets of coarse positioning mechanisms are symmetrically arranged on both sides of the injection station.

[0009] Furthermore, the coarse positioning mechanism includes a pneumatic-hydraulic booster cylinder disposed horizontally on the mounting base, and the movable end of the pneumatic-hydraulic booster cylinder is connected to a flexible clamping block; The flexible clamping block includes a mounting housing, which contains a fixing block. At least one first arc-shaped mounting block is movably mounted on the fixing block. The first arc-shaped mounting block and the fixing block are slidably connected through an arc-shaped surface. At least one second arc-shaped mounting block is movably mounted on the first arc-shaped mounting block. The second arc-shaped mounting block and the first arc-shaped mounting block are slidably connected through an arc-shaped surface. A silicone pad is provided on the clamping surface of the second arc-shaped mounting block.

[0010] In the above technical solution, during coarse positioning, the gas-hydraulic booster cylinder drives the flexible clamping block to move forward. The two flexible clamping blocks clamp the battery cell from the side to achieve radial positioning of the battery cell. During coarse positioning, the silicone pad on the clamping surface of the second arc-shaped mounting block contacts the side wall of the battery cell to achieve flexible positioning and clamping of the battery cell, avoiding damage to the battery cell shell caused by the existing rigid clamping. At the same time, the second arc-shaped mounting block and the first arc-shaped mounting block are slidably connected through the arc-shaped surface, and the first arc-shaped mounting block and the fixed block are slidably connected through the arc-shaped surface. When clamping battery cell shells of different diameters, this design can adaptively adjust the clamping of the battery cell shell to achieve better clamping of battery cells of different diameters.

[0011] Furthermore, a pressure sensor is embedded in the silicone pad, which is electrically connected to the controller, and the controller is electrically connected to the gas-liquid booster cylinder.

[0012] In the above technical solution, when the pressure sensor detects that the clamping force on the battery cell exceeds the deformation stress of the battery cell shell, the gas-liquid booster cylinder moves in the opposite direction to reduce the clamping force on the battery cell.

[0013] Furthermore, the gas-liquid booster cylinder is also equipped with a first distance sensor, the distance from the first distance sensor to the battery cell is the same as the distance from the silicone pad to the battery cell, and the first distance sensor is electrically connected to the gas-liquid booster cylinder.

[0014] In the above technical solution, after the first distance sensor detects the distance between the silicone pad and the battery cell, it feeds back to the gas-liquid booster cylinder. The gas-liquid booster cylinder drives the silicone pad to move by that distance to achieve accurate clamping of the battery cell.

[0015] Furthermore, each of the injection stations on the mounting base is provided with an electric actuator in the vertical direction, and the movable end of the electric actuator is connected to a connecting plate, and the electrolyte tube is fixed on the connecting plate.

[0016] Furthermore, the precision positioning mechanism includes an adsorption block distributed around the injection needle. The adsorption block is connected to a vacuum pump through a vacuum tube. The adsorption block is located directly above the injection station, and the adsorption block can contact the flange at the upper end of the battery cell housing as the injection needle descends.

[0017] In the above technical solution, as the adsorption block and the injection needle move downward under the drive of the electric push rod, the adsorption block can contact the flange at the upper end of the battery cell shell. The axial positioning of the battery cell is achieved through vacuum adsorption, which avoids the shaking of the battery cell during the injection process. Moreover, if the battery cell is tilted to a certain extent during coarse positioning, the contact between the adsorption block and the flange at the upper end of the battery cell shell can also straighten the battery cell, thereby achieving axial positioning of the battery cell and improving the injection effect.

[0018] Furthermore, a second distance sensor is provided on the adsorption block for detecting the vertical distance between the adsorption block and the flange at the upper end of the battery cell housing. The second distance sensor is electrically connected to the controller, which is electrically connected to the electric push rod.

[0019] In the above technical solution, after the second sensor detects the vertical distance between the adsorption block and the flange at the top of the battery cell casing, it transmits the signal to the electric push rod. The electric push rod then moves the adsorption block a corresponding distance to achieve adsorption and positioning of the battery cell.

[0020] A method for auxiliary liquid injection of a lithium battery cell, using any one of the above-described lithium battery cell auxiliary liquid injection devices, includes the following main steps: S1, the battery cell is delivered to the position, and the delivery mechanism transports the battery cell to the liquid injection station; S2, Coarse positioning of the battery cell: The gas-liquid booster cylinders on both sides of the battery cell are activated, which drive the flexible clamps to move closer to the battery cell. The two flexible clamps hold the battery cell from the side, thereby achieving radial positioning of the battery cell. S3, precise positioning of the battery cell: the electric push rod drives the adsorption block and the injection needle to descend until the adsorption block contacts the flange at the upper end of the battery cell housing, and the axial positioning of the battery cell is achieved by negative pressure adsorption; S4. After the cell is precisely positioned, the injection needle is inserted into the injection hole on the cell to begin quantitative injection.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This solution uses a coarse positioning mechanism to radially position the battery cell and a fine positioning mechanism to axially position the battery cell, achieving precise positioning of the battery cell and improving the liquid injection effect. At the same time, this device can simultaneously inject liquid into multiple battery cells, improving the liquid injection efficiency. 2. This solution uses a flexible clamping block with a silicone pad and combines it with a gas-hydraulic booster cylinder to output a constant clamping force, so that the clamping process has flexible self-adaptive capability. Even if the battery cell shell has manufacturing tolerances, slight elliptical deformation or uneven surface, it can achieve stable clamping without damaging the battery cell shell, bending the tabs, or squeezing the diaphragm, which significantly improves the structural safety of the battery cell during the liquid injection process. 3. First, the flexible clamping block completes the overall macroscopic coarse positioning of the battery cell, restricting its degree of freedom in the horizontal plane; then, the vacuum adsorption module performs axial precise positioning of the flanged area of ​​the battery cell shell, compensating for the slight positional offset or angular tilt generated during the transmission process. The two-stage positioning works together to ensure the overall stability of the battery cell and ensure that the injection needle is always vertically aligned with the injection port, significantly improving the injection accuracy and consistency. 4. The non-contact vacuum adsorption method is used to position the flanged area of ​​the cell's liquid injection port, avoiding crushing, deformation or stress concentration caused by traditional mechanical clamping of the aluminum shell flange, effectively protecting the integrity of the flanged structure, providing a good sealing foundation for subsequent sealing processes, and improving the overall safety and cycle life of the battery. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 A schematic diagram of a local structure in the image; Figure 3 for Figure 1 A schematic diagram of the precision positioning mechanism in the middle; Figure 4 for Figure 1 A schematic diagram of the flexible clamping block in the diagram; Figure 5 for Figure 4 A schematic diagram of the structure after removing the mounting shell. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to experimental examples and specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0024] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0025] As attached Figure 1 - Appendix Figure 5 The device illustrates an auxiliary electrolyte injection device for lithium battery cells. This device is suitable for injecting electrolyte into cylindrical battery cells (such as cell models 18650, 21700, and 26650). The cylindrical battery cell has a flanged structure at the upper end of its outer shell, and the electrolyte injection hole is located at the top of the positive terminal. The device includes a mounting base 1 with multiple injection stations arranged in a straight line. A conveying mechanism 2 transports the battery cell 8 to each injection station. A position detection sensor 21 (see reference) is provided on the mounting base 1 corresponding to the position of each injection station. Figure 2 The position detection sensor 21 is electrically connected to the audible and visual alarm. The position detection sensor 21 is used to detect whether the battery cell 8 has reached the liquid injection position. When an abnormality occurs, the position detection sensor 21 will give a signal to the audible and visual alarm. The audible and visual alarm will issue an alarm signal indicating that the battery cell 8 has not reached the liquid injection position. At this time, the device will stop operating.

[0026] The mounting base 1 is provided with a coarse positioning mechanism and a fine positioning mechanism corresponding to each of the liquid injection stations. The coarse positioning mechanism is used to perform radial positioning of the battery cell 8, and the fine positioning mechanism is used to perform axial positioning of the battery cell 8. The mounting base 1 is provided with an electrolyte tank 5 corresponding to each of the liquid injection stations. The electrolyte tank 5 is connected to the liquid injection needle 53 through an electrolyte pipe 51. The liquid injection needle 53 is used to inject liquid into the battery cell 8 at the corresponding liquid injection station.

[0027] Two sets of coarse positioning mechanisms are provided for each of the injection stations, symmetrically arranged on both sides of the injection station. The line connecting the two sets of coarse positioning mechanisms is perpendicular to the conveying direction of the conveying mechanism.

[0028] Specifically, in this embodiment, the coarse positioning mechanism includes a gas-liquid booster cylinder 4 disposed horizontally on the mounting base 1. The movable end of the gas-liquid booster cylinder 4 is connected to a flexible clamping block 3, and the clamping surface of the flexible clamping block 3 faces the battery cell 8.

[0029] refer to Figure 4 and Figure 5The flexible clamping block 3 includes a mounting housing 30 connected to the movable end of the gas-liquid booster cylinder 4. A fixing block 31 is provided inside the mounting housing 30. Two first arc-shaped mounting blocks 32 are movably mounted on the side of the fixing block 31 facing the battery cell 8. The first arc-shaped mounting blocks 32 are slidably connected to the fixing block 31 via an arc-shaped surface, and the first arc-shaped mounting blocks 32 are rotatably connected to the mounting housing 30, meaning the first arc-shaped mounting blocks 32 can rotate relative to the mounting housing 30. During rotation, the first arc-shaped mounting blocks 32 slide along the arc-shaped surface between themselves and the fixing block 31. The first arc-shaped mounting block 32 has two second arc-shaped mounting blocks 33 movably mounted on the side facing the battery cell 8. The second arc-shaped mounting blocks 33 are slidably connected to the first arc-shaped mounting block 32 through an arc-shaped surface. The second arc-shaped mounting blocks 33 can rotate relative to the first arc-shaped mounting block 32. When the second arc-shaped mounting blocks 33 rotate relative to the first arc-shaped mounting block 32, the second arc-shaped mounting blocks 33 slide along the arc-shaped surface between them. The clamping surface of the second arc-shaped mounting blocks 33 is provided with two silicone pads 34.

[0030] A pressure sensor 35 is embedded in the silicone pad 34. The pressure sensor 35 is electrically connected to the controller, and the controller is electrically connected to the gas-liquid booster cylinder 4.

[0031] The gas-liquid booster cylinder 4 is also provided with a first distance sensor 41. The distance from the first distance sensor 41 to the battery cell 8 is the same as the distance from the silicone pad 34 to the battery cell 8, and the first distance sensor 41 is electrically connected to the gas-liquid booster cylinder 4.

[0032] Once the battery cell 8 is conveyed to the liquid injection station by the conveying mechanism 2 and confirmed to be in place by the positioning detection sensor 21, the controller activates the coarse positioning mechanism. The symmetrically arranged flexible clamping blocks 3, driven by the gas-hydraulic booster cylinder 4, slowly and synchronously approach the battery cell 8. Each flexible clamping block 3 is designed with four semi-circular second arc-shaped mounting blocks 33. The clamping surface of the second arc-shaped mounting blocks 33 is designed with silicone pads 34 and embedded with pressure sensors 35. This allows the front-end pressure sensors 35 to gently contact the outer surface of the battery cell 8 shell and monitor the clamping pressure on the battery cell 8. The gas-hydraulic booster cylinder 4 outputs a constant clamping force. This constant force mechanism ensures that even if the battery cell 8 has diameter tolerances or slight elliptical deformation, the clamping force remains stable, avoiding shell indentations or electrode damage caused by overpressure in traditional rigid clamps. Simultaneously, the first distance sensor 41 monitors the distance between the clamping surface of the flexible clamping block 3 and the battery cell 8 and feeds the data back to the controller, which then controls the output distance of the gas-hydraulic booster cylinder 4.

[0033] Each of the injection stations on the mounting base 1 is provided with an electric actuator 7 in the vertical direction. The movable end of the electric actuator 7 is connected to a connecting plate 71. The electrolyte tube 51 is fixed on the connecting plate 71. Both the electrolyte tube 51 and the vacuum tube 62 are flexible tubes. When the electric actuator 7 is started, it can drive the electrolyte tube 51 fixed on the connecting plate 71 to move down synchronously. A one-way valve 52 is provided on the electrolyte tube 51.

[0034] refer to Figure 3 The precision positioning mechanism includes an adsorption block 63 distributed around the injection needle 53. The adsorption block 63 is connected to the vacuum pump 61 through a vacuum tube 62. The adsorption block 63 is located directly above the injection station. As the injection needle 53 descends, the adsorption block 63 can contact the flange at the upper end of the outer shell of the battery cell 8, thereby achieving axial positioning of the battery cell 8 through vacuum adsorption.

[0035] A second distance sensor 64 is provided on the adsorption block 63 for detecting the vertical distance between the adsorption block 63 and the flange at the upper end of the outer shell of the battery cell 8. The second distance sensor 64 is electrically connected to the controller, which is electrically connected to the electric push rod 7. After the second distance sensor 64 detects the vertical distance between the adsorption block 63 and the flange at the upper end of the outer shell of the battery cell 8, it transmits the signal to the controller. The controller controls the electric push rod 7 to drive the adsorption block 63 down by the distance, and then the vacuum pump starts the adsorption block 63 to achieve adsorption and positioning of the flange on the outer shell of the battery cell 8.

[0036] After the coarse positioning mechanism completes the coarse positioning of the battery cell 8, the fine positioning mechanism begins to operate. Specifically, the electric push rod 7, based on the signal transmitted by the second distance sensor 64 and processed by the controller, controls the electric push rod 7 to drive the adsorption block 63 to descend by the detection distance until the adsorption block 63 contacts the upper edge of the battery cell 8 and stops (if the battery cell 8 is tilted at a small angle at this time, the electric push rod 7 will stop when any part of the adsorption block 63 contacts the edge of the battery cell 8). The vacuum pump 61 starts, forming a local negative pressure through the adsorption block 63 to achieve axial limiting of the battery cell 8, achieving more precise positioning, and compensating for the slight position or angle deviation of the battery cell 8 during the transmission process. When the adsorption block 63 moves, the injection needle 53 simultaneously enters the injection hole of the battery cell 8, activating the solenoid valve to inject electrolyte (if the battery cell is tilted at a small angle at this time, the adsorption block 63 can compensate for the small angle, ensuring that the injection needle 53 is always vertical, ensuring that the injection needle 53 is precisely aligned with the injection port on the battery cell 8). During the liquid injection process, the coarse positioning mechanism continuously provides stable constraints, limiting the displacement of the battery cell 8 in the horizontal plane. However, due to its flexible constant force characteristics, it does not hinder the fine positioning mechanism from finely adjusting the battery cell 8.

[0037] An auxiliary electrolyte injection method for lithium battery cells, employing Figures 1-5The lithium battery cell auxiliary liquid injection device described herein includes the following main steps: S1, Battery cell 8 is delivered to position: The conveying mechanism 2 delivers the battery cell 8 to the liquid injection station; S2, coarse positioning of battery cell 8: start the gas-liquid booster cylinders 41 on both sides of the battery cell 8, drive the flexible clamping blocks 3 to move closer to the battery cell 8, and the two flexible clamping blocks 3 clamp the battery cell 8 from the side to achieve radial positioning of the battery cell 8. The first distance sensor 41 detects the distance between the clamping surface of the flexible clamping block 3 and the battery cell 8, and feeds the data back to the controller. The controller controls the output distance of the pneumatic-hydraulic booster cylinder 4, which outputs a constant clamping force (which can be set by parameters) to ensure that the clamping force does not fluctuate with slight changes in the size of the battery cell 8. The first arc-shaped mounting block 32 and the second arc-shaped mounting block 33 can automatically compensate for manufacturing tolerances, slight ovality or local unevenness, and achieve flexible adaptive fitting. The silicone pad 34 can avoid local stress concentration on the outer shell of the battery cell 8 during clamping, prevent the tabs from bending, the diaphragm from being squeezed or the shell from being deformed. After clamping, it restricts the radial movement of the battery cell 8 and achieves coarse positioning. S3, Precision positioning of battery cell 8: After coarse positioning is completed, the electric push rod 7 drives the adsorption block 63 and the injection needle 53 to descend until the adsorption block 63 contacts the flange at the upper end of the outer shell of the battery cell 8, and the axial positioning of the battery cell 8 is achieved by negative pressure adsorption. The specific process is as follows: After the second distance sensor 64 detects the vertical distance between the adsorption block 63 and the flange at the top of the battery cell 8's outer shell, it transmits the signal to the controller. The controller controls the electric push rod 7 to drive the adsorption block 63 down by this distance. Then, the vacuum pump starts the adsorption block 63 to achieve adsorption and positioning of the flange on the battery cell 8's outer shell. By adsorbing the flange plane at the top of the battery cell 8's outer shell under negative pressure, a slight position and angle compensation adjustment is achieved. The vacuum adsorption positioning process avoids causing indentations or deformation to the flange of the battery cell 8's outer shell. The adsorption force is adjustable to ensure stable adsorption without damaging the surface of the battery cell 8's outer shell. Coarse positioning provides overall stability; fine positioning ensures that the injection needle 53 is strictly aligned with the center of the injection port on the outer casing of the battery cell 8, ultimately meeting the requirement of high consistency injection. S4, after the precise positioning of the battery cell 8 is completed, the injection needle 53 is inserted into the injection port on the battery cell 8 to start quantitative injection; after the injection is completed, the vacuum adsorption of the precise positioning mechanism is released, the gas-liquid booster cylinder 41 of the coarse positioning mechanism drives the flexible clamp 3 to retract, and the battery cell 8 is sent out by the conveying mechanism 2 to enter the next process.

[0038] The preferred embodiments of the present invention have been described above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A lithium battery cell auxiliary liquid injection device, characterized in that: Includes a mounting base (1), which is provided with multiple liquid injection stations, and a conveying mechanism (2) is able to transport the battery cell (8) to the liquid injection station; The mounting base (1) is provided with a coarse positioning mechanism and a fine positioning mechanism respectively corresponding to each of the liquid injection stations. The coarse positioning mechanism is used to radially position the battery cell (8), and the fine positioning mechanism is used to axially position the battery cell (8). An electrolyte tank (5) is provided on the mounting base (1) at the position corresponding to each of the liquid injection stations. The electrolyte tank (5) is connected to the liquid injection needle (53) through the electrolyte pipe (51). The liquid injection needle (53) is used to inject liquid into the battery cell (8) at the corresponding liquid injection station. Two sets of coarse positioning mechanisms are provided for each of the injection stations, and the two sets of coarse positioning mechanisms are symmetrically arranged on both sides of the injection station. The coarse positioning mechanism includes a gas-liquid booster cylinder (4) arranged horizontally on the mounting base (1), and the movable end of the gas-liquid booster cylinder (4) is connected to a flexible clamp (3). The flexible clamping block (3) includes a mounting housing (30), which has a fixing block (31) inside. At least one first arc-shaped mounting block (32) is movably mounted on the fixing block (31). The first arc-shaped mounting block (32) and the fixing block (31) are slidably connected through an arc surface. At least one second arc-shaped mounting block (33) is movably mounted on the first arc-shaped mounting block (32). The second arc-shaped mounting block (33) and the first arc-shaped mounting block (32) are slidably connected through an arc surface. A silicone pad (34) is provided on the clamping surface of the second arc-shaped mounting block (33). The mounting base (1) is provided with an electric push rod (7) in the vertical direction for each of the liquid injection stations. The movable end of the electric push rod (7) is connected to a connecting plate (71), and the electrolyte tube (51) is fixed on the connecting plate (71). The precision positioning mechanism includes an adsorption block (63) distributed around the injection needle (53). The adsorption block (63) is connected to the vacuum pump (61) through a vacuum tube (62). The adsorption block (63) is located directly above the injection station. As the injection needle (53) descends, the adsorption block (63) can contact the flange at the upper end of the outer shell of the battery cell (8).

2. The lithium battery cell auxiliary liquid injection device according to claim 1, characterized in that: The mounting base (1) is provided with several positioning detection sensors (21), which are used to detect whether the battery cell (8) has reached the liquid injection station.

3. The lithium battery cell auxiliary liquid injection device according to claim 1, characterized in that: A pressure sensor (35) is embedded in the silicone pad (34), and the pressure sensor (35) is electrically connected to the controller, which is electrically connected to the gas-liquid booster cylinder (4).

4. The lithium battery cell auxiliary liquid injection device according to claim 1, characterized in that: The gas-liquid booster cylinder (4) is also provided with a first distance sensor (41), the distance from the first distance sensor (41) to the battery cell (8) is the same as the distance from the silicone pad (34) to the battery cell (8), and the first distance sensor (41) is electrically connected to the gas-liquid booster cylinder (4).

5. The lithium battery cell auxiliary liquid injection device according to claim 1, characterized in that: A second distance sensor (64) is provided on the adsorption block (63) for detecting the vertical distance between the adsorption block (63) and the flange at the upper end of the outer shell of the battery cell (8). The second distance sensor (64) is electrically connected to the controller, which is electrically connected to the electric push rod (7).

6. A method for auxiliary electrolyte injection into a lithium battery cell, characterized in that, The lithium battery cell auxiliary liquid injection device according to any one of claims 1-5 includes the following main steps: S1, Battery cell (8) is delivered to position: The delivery mechanism (2) delivers the battery cell (8) to the liquid injection station; S2, coarse positioning of battery cell (8): start the gas-liquid booster cylinders (4) on both sides of the battery cell (8) to drive the flexible clamps (3) to move closer to the battery cell (8). The two flexible clamps (3) clamp the battery cell (8) from the side to achieve radial positioning of the battery cell (8). S3, Precision positioning of the battery cell (8): The electric push rod (7) drives the adsorption block (63) and the injection needle (53) to descend until the adsorption block (63) contacts the flange at the upper end of the outer shell of the battery cell (8), and the axial positioning of the battery cell (8) is achieved by negative pressure adsorption; S4, After the precision positioning of the battery cell (8) is completed, the injection needle (53) extends into the injection port on the battery cell (8) and starts quantitative injection.

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