Electrolyte injection machine with gas-liquid interface stable structure

Abstract

The utility model relates to an electrolyte injection machine with a gas-liquid interface stable structure. The electrolyte injection machine comprises a bottom plate, a transmission mechanism fixed at the upper end of the bottom plate, an electrolyte injection head fixed on the transmission mechanism and a conveying mechanism fixed at the upper end of the bottom plate. By means of the well-designed injection head, the polytetrafluoroethylene film can be attached to the liquid level all the time, the polytetrafluoroethylene film is used as a gas-liquid interface stable structure, the surface tension between electrolyte and air reaches a relatively balanced state, bubbles generated due to rapid change of the surface tension are avoided, and the service life of the electrolyte is prolonged. The gas generated during electrolyte injection is greatly reduced, and the structure can also have a better effect of preventing the generation of bubbles during injection under a non-vacuum condition, so that the energy consumption is reduced.

Description

Technical Field

[0001] This utility model relates to the field of battery production, and in particular to an electrolyte injection machine with a gas-liquid interface stable structure. Background Technology

[0002] With the continuous development of the battery manufacturing industry, the requirements for electrolyte injection are becoming increasingly stringent, especially in the preparation of lead-acid batteries. Air in the electrolyte is very harmful to the battery, and the presence of bubbles in the electrolyte can cause many problems. During battery charging and discharging, bubbles may cause excessively high local current density, leading to uneven reactions of electrode materials and thus accelerating battery aging. In addition, bubbles may also block the channels between the electrodes and the separator, increasing the battery's internal resistance and affecting its performance. If too many bubbles accumulate inside the battery, it may also cause changes in internal pressure, posing a safety hazard. Existing electrolyte injection equipment still has some shortcomings in the battery production field. For example, patent CN209607835U discloses an electrolyte injection device for soft-pack lithium batteries, which has the following shortcomings in the field of electrolyte injection: During centrifugation, due to the position of the cell in the fixture, the shape of the battery itself, and differences in its internal structure, the centrifugal force may be unevenly distributed inside the cell, leading to the generation of bubbles. Utility Model Content

[0003] (a) Technical problems to be solved

[0004] With a carefully designed injection head, the PTFE film can always adhere to the liquid surface. Utilizing the PTFE film as a gas-liquid interface stabilizing structure, the surface tension between the electrolyte and air reaches a relatively balanced state, avoiding the generation of bubbles due to rapid changes in surface tension. This greatly reduces the generation of gas during electrolyte injection. Moreover, this structure can also effectively prevent bubble generation during injection under non-vacuum conditions, reducing energy consumption.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, this utility model provides the following technical solution: a gas-liquid interface stable structure electrolyte injection machine, including a base plate, a transmission mechanism fixed to the upper end of the base plate, an injection head fixed to the transmission mechanism, and a conveying mechanism fixed to the upper end of the base plate.

[0007] The injection head includes a fixed plate fixed to the transmission mechanism, a flow regulator fixed to the side of the fixed plate, a needle fixed to the lower end of the flow regulator, a motor support plate fixed to the lower end of the fixed plate, a motor fixed to the motor support plate, a drive wheel fixed to the lower end of the motor, a telescopic column that meshes with the drive wheel on its side, a gas-liquid interface stabilizing mechanism fixed to the bottom of the telescopic column, an air tube fixed inside the telescopic column, and a limiting block installed on the outside of the telescopic column.

[0008] The gas-liquid interface stabilization mechanism has a support plate above it and a polytetrafluoroethylene film below it.

[0009] A polytetrafluoroethylene film is fixed in a ring below the support plate, with a first through hole in the middle.

[0010] The support plate has a second through hole at the center of its bottom and a third through hole at the rear of its bottom.

[0011] The telescopic column is equipped with a toothed rack on its side.

[0012] A conical protective cover is provided at the bottom of the needle.

[0013] (III) Beneficial Effects

[0014] The purpose of this invention is to provide an electrolyte injection machine with a gas-liquid interface stabilization structure. This injection machine, through a carefully designed injection head, especially its gas-liquid interface stabilization mechanism, utilizes a polytetrafluoroethylene (PTFE) film as the gas-liquid interface stabilization structure to achieve a relative equilibrium of surface tension between the electrolyte and air. This design avoids the generation of bubbles due to rapid changes in surface tension, significantly reducing gas production during electrolyte injection. It is an innovative technology with broad application prospects. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall design of this utility model.

[0016] Figure 2 This is a schematic diagram of the injection head in this utility model.

[0017] Figure 3 This is a schematic diagram of the internal structure of the injection head in this utility model.

[0018] Figure 4 This is a schematic diagram of the gas-liquid interface stabilization mechanism in this utility model.

[0019] Figure 5 This is a schematic diagram of the support plate in this utility model.

[0020] Figure 6 This is a schematic diagram of the telescopic column in this utility model.

[0021] Figure 7 This is a schematic diagram of the needle in this utility model.

[0022] In the diagram: 1-Base plate, 2-Transmission mechanism, 3-Injection head, 301-Fixing plate, 302-Flow regulator, 303-Needle, 3031-Conical protective cover, 304-Motor support plate, 305-Motor, 306-Drive wheel, 307-Telescopic column, 3071-Rack, 308-Gas-liquid interface stabilizing mechanism, 3081-Support plate, 3082-PTFE film, 3083-Second through hole, 3084-First through hole, 3085-Third through hole, 309-Gas tube, 310-Limiting block, 4-Conveying mechanism. Detailed Implementation

[0023] The following will refer to the appendix in the example of this utility model. Figure 1 -Appendix Figure 7 The technical solutions in the embodiments of this utility model are clearly and completely described. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] like Figure 1 As shown, this utility model provides a technical solution: a gas-liquid interface stabilizing electrolyte injection machine, including a base plate 1, a transmission mechanism 2 fixed to the upper end of the base plate 1, an injection head 3 fixed to the transmission mechanism 2, and a conveying mechanism 4 fixed to the upper end of the base plate 1. The base plate 1 serves as the basic support component of the entire electrolyte injection machine, providing a stable mounting platform for other mechanisms and components, ensuring the stability of the entire equipment during operation. This ensures the overall structural stability of the electrolyte injection machine and prevents the injection accuracy and stability from being affected by machine shaking. The transmission mechanism 2 realizes the three-dimensional movement of the injection head 3, aligning it with the battery's injection port according to a programmed preset route. The injection head 3 is the core component for realizing electrolyte injection. Through the coordinated action of multiple sub-components, it accurately injects the electrolyte into the battery, and the gas-liquid interface stabilizing mechanism 308 controls the stability of the gas-liquid interface. This ensures that the electrolyte can be injected at a stable flow rate and pressure, while reducing the generation of bubbles and improving the injection quality. The conveying mechanism 4 is responsible for transporting the battery to the injection position.

[0025] like Figure 2 , 3As shown, the injection head 3 includes a fixing plate 301 fixed to the transmission mechanism 2, a flow regulator 302 fixed to the side of the fixing plate 301, a needle 303 fixed to the lower end of the flow regulator 302, a motor support plate 304 fixed to the lower end of the fixing plate 301, a motor 305 fixed to the motor support plate 304, a drive wheel 306 fixed to the lower end of the motor 305, a telescopic column 307 that meshes with the drive wheel 306 on its side, a gas-liquid interface stabilizing mechanism 308 fixed to the bottom of the telescopic column 307, an air pipe 309 fixed inside the telescopic column 307, and a limiting block 310 installed on the outside of the telescopic column 307. The fixing plate 301 serves as the basic fixing component of the injection head 3, fixing components such as the flow regulator 302 and the motor support plate 304 to the transmission mechanism 2, so that the various components of the injection head 3 form an organic whole. This ensures that the relative positions between the various components of the injection head 3 are fixed, enabling the entire injection head 3 to work stably, thereby improving the stability and accuracy of the injection. The flow regulator 302 is used to regulate the electrolyte flow rate, precisely controlling the amount of electrolyte injected according to actual production needs to meet the electrolyte quantity requirements of different battery specifications. This precise control of the injected electrolyte helps improve the consistency and quality of battery production, while also preventing electrolyte waste. The needle 303 directly contacts the electrolyte and guides it to the target position. The motor support plate 304 provides stable support for the motor 305, which acts as a power source, providing power to the telescopic column 307 and ensuring its stable operation. This provides stable power support for the up-and-down movement of the telescopic column 307, ensuring a smooth electrolyte injection process. The motor 305 drives the drive wheel 306 to rotate. The drive wheel 306 meshes with the rack 3071 on the side of the telescopic column 307, thereby driving the telescopic column 307 to move up and down. The precise up-and-down movement of the telescopic column 307 drives the gas-liquid interface stabilizing mechanism 308, ensuring that the needle 303 remains stationary during the movement of the mechanism, reducing turbulence during injection and further minimizing bubble formation. The presence of the PTFE film 3082 within the gas-liquid interface stabilizing mechanism 308 allows for a relative equilibrium of surface tension between the electrolyte and air. Through its interaction with the electrolyte and air, the film adjusts the energy state of the gas-liquid interface, acting as a "buffer zone" between unstable interfaces and suppressing surface tension fluctuations. This equilibrium effectively prevents gas from mixing into the electrolyte and forming bubbles due to surface tension imbalance. The air tube 309 ensures that the air pressure within the PTFE film 3082 in the gas-liquid interface stabilizing mechanism 308 remains constant, preventing changes in liquid surface energy that could lead to bubble formation. The limiting block 310 ensures that the telescopic column 307 can only move vertically up and down, so that when the electrolyte level rises, the polytetrafluoroethylene film 3082 can be stably extracted from the battery.

[0026] like Figure 4As shown, the gas-liquid interface stabilization mechanism 308 has a support plate 3081 above it and a polytetrafluoroethylene film 3082 below it. The support plate 3081 above provides support and fixation, while the polytetrafluoroethylene film 3082 below maintains contact with the liquid surface and uses its own properties to achieve a relative balance between the surface tension of the electrolyte and the air, reducing the generation of bubbles. It can also effectively prevent bubbles under non-vacuum conditions and improve the quality of electrolyte injection.

[0027] In summary, the gas-liquid interface stabilization mechanism 308 has the following functions:

[0028] Maintaining interfacial integrity: Surface tension exists at the liquid surface, making it act like an elastic film. At the gas-liquid interface, surface tension tends to minimize the liquid surface area. When electrolyte is injected, if the gas-liquid interface is stable, surface tension can prevent excessive disturbance of the liquid. For example, at a stable gas-liquid interface, like a calm lake, when new electrolyte is slowly injected, surface tension allows the electrolyte to blend smoothly with the existing liquid without easily forming pits or bulges, thus reducing the chance of air being entrained and forming bubbles.

[0029] Suppressing cavitation caused by fluctuations: When there are pressure changes in liquid flow, such as small fluctuations in injection speed, it may cause a local pressure drop, leading to cavitation (the formation of small vacuum bubbles) inside the liquid. A stable gas-liquid interface structure can suppress the transmission of this fluctuation through surface tension.

[0030] A stable structure at the gas-liquid interface helps prevent the formation of turbulence and vortices. Turbulence is characterized by the irregular movement of fluids, which can cause air to be entrained into the liquid.

[0031] like Figure 4 As shown, a polytetrafluoroethylene film 3082 is fixed in a ring below the support plate 3081, and a first through hole 3084 is provided in the middle; the first through hole 3084 is used for the needle 303 to pass through.

[0032] like Figure 5 As shown, the support plate 3081 has a second through hole 3083 at the bottom center and a third through hole 3085 at the bottom rear. The second through hole 3083 corresponds to the first through hole 3084 and is used to pass through the needle 303. The upper end of the third through hole 3085 is connected to the air tube 309 for passing through the gas.

[0033] like Figure 6 As shown, a rack 3071 is provided on the side of the telescopic column 307; the rack 3071 meshes with the drive wheel 306, thereby driving the telescopic column 307 to move up and down.

[0034] like Figure 7As shown, a conical protective cover 3031 is provided at the bottom of the needle 303 to prevent the polytetrafluoroethylene film 3082 from contacting the needle and breaking.

[0035] Working principle:

[0036] During operation, the battery basket is placed above the conveying mechanism 4, which automatically transports the battery to the bottom of the injection head 3. The transmission mechanism 2 extends the injection head 3 into the battery. The air tube 309 is connected to an external air source. At this time, the air tube 309 begins to inflate the polytetrafluoroethylene film 3082, filling the battery electrolyte chamber. The needle 303 begins to inject electrolyte into the battery, while the polytetrafluoroethylene film 3082 slowly deflates. The telescopic column 307 begins to move upward. Due to the incompressibility of the liquid, the polytetrafluoroethylene film 3082 must always be kept in close contact with the liquid surface until the electrolyte injection is complete.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gas-liquid interface stabilizing structure electrolyte injector, characterized by, It comprises a bottom plate (1), a transmission mechanism (2) fixed on the upper end of the bottom plate (1), a liquid injection head (3) fixed on the transmission mechanism (2) and a conveying mechanism (4) fixed on the upper end of the bottom plate (1); The liquid injection head (3) comprises a fixed plate (301) fixed on the transmission mechanism (2), a flow regulator (302) fixed on the side of the fixed plate (301), a needle head (303) fixed on the lower end of the flow regulator (302), a motor support plate (304) fixed on the lower end of the fixed plate (301), a motor (305) fixed on the motor support plate (304), a driving wheel (306) fixed on the lower end of the motor (305), an extension column (307) meshing with the side of the driving wheel (306), an air-liquid interface stabilizing mechanism (308) fixed on the bottom of the extension column (307), an air pipe (309) fixed in the extension column (307) and a limiting block (310) installed on the outside of the extension column (307).

2. The gas-liquid interface stabilizing structure electrolyte injector according to claim 1, characterized by, The air-liquid interface stabilizing mechanism (308) is provided with a support plate (3081) above and a polytetrafluoroethylene film (3082) below.

3. The gas-liquid interface stabilizing structure electrolyte injector according to claim 2, characterized by, The polytetrafluoroethylene film (3082) is annularly fixed below the support plate (3081) and is provided with a first through hole (3084) in the middle.

4. The gas-liquid interface stabilizing structure electrolyte injector according to claim 2, characterized by The support plate (3081) is provided with a second through hole (3083) in the center of the bottom and a third through hole (3085) at the back of the bottom.

5. The gas-liquid interface stabilizing structure electrolyte injector according to claim 1, characterized by, The extension column (307) is provided with a rack (3071) on the side.

6. The gas-liquid interface stabilizing structure electrolyte injector according to claim 1, characterized by The needle head (303) is provided with a conical protective cover (3031) on the bottom.

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