Battery electrolyte filling equipment

Abstract

The utility model relates to filling equipment, and provides battery electrolyte filling equipment which comprises an equipment main body, a lifting seat, a transmission line, a valve body and the like, a control panel is arranged on the equipment body, a lifting seat is arranged on the lower portion of the equipment body, a transmission line is installed on the upper portion of the lifting seat, a plurality of valve bodies are arranged on the upper portion of the equipment body, liquid inlet connectors and liquid outlet connectors are arranged on the valve bodies, and the liquid inlet connectors of the valve bodies are used for being connected with an external liquid supply device. According to the utility model, the spiral fluid director is integrated at the front end of the fluid injection needle, so that the electrolyte generates rotational flow motion, the path limitation of traditional single-point linear fluid injection is broken through, and under the rotational flow action, the electrolyte is uniformly diffused by 360 degrees along the inner wall of the battery and completely covers the edge area of a pole piece, so that the problem of non-uniform infiltration caused by a local'dry area 'is solved; meanwhile, bubble discharge is accelerated through centrifugal force, the difference of lithium ion deposition on the surface of the pole piece is remarkably reduced, the hidden danger of lithium precipitation is effectively inhibited, and the safety and cycle life of the battery are improved.

Description

Technical Field

[0001] This utility model relates to a filling device, and more particularly to a battery electrolyte filling device. Background Technology

[0002] In lithium-ion battery manufacturing, the electrolyte injection process directly affects the electrode wetting quality and battery performance.

[0003] Traditional single-point linear electrolyte injection structures inject electrolyte in a unidirectional direction. Due to the limited internal space of prismatic / pouch batteries, the electrolyte tends to accumulate in the central area along a straight path, making it difficult to diffuse evenly to the electrode edges. This results in "dry zones" forming blind spots, leading to uneven lithium-ion deposition and lithium plating. Furthermore, the significant bubble retention during linear injection further exacerbates the heterogeneity of electrode surface reactions, limiting battery cycle life and safety. Specifically, current injection equipment mostly uses straight-tube injection needles with flat or microporous ends, injecting the electrolyte into the battery in a linear jet. In prismatic / pouch batteries, this structure creates reflected flow due to internal wall obstruction, causing disordered electrolyte distribution and less than 50% coverage in the edge areas. Simultaneously, high-speed single-point injection easily generates turbulent flow that entrains bubbles. Residual bubbles, upon contact with the electrode surface, hinder ion migration, leading to electrochemical performance degradation. While existing technologies improve uniformity by optimizing injection pressure or using multi-stage injection, they still cannot fundamentally solve the problems of limited diffusion paths and bubble entrainment. Utility Model Content

[0004] In order to solve the problems mentioned in the background art, the purpose of this utility model is to provide a battery electrolyte filling device.

[0005] A battery electrolyte filling device includes a main body, a lifting base, a transmission line, valve bodies, a liquid transfer pipe, a pump body, a pressure stabilizing tank, a liquid injection needle, and a hydrocyclone. The main body has a control panel, a lifting base at its lower part, a transmission line mounted on the upper part of the lifting base, and multiple valve bodies arranged on the upper part of the main body. Each valve body has an inlet connector and an outlet connector. The inlet connector of the valve body is used to connect to an external liquid supply device, and the outlet connector of each valve body is equipped with a liquid transfer pipe. Multiple pump bodies are located in the upper part of the main body, the number of pump bodies matching the number of valve bodies. The input end of each pump body is connected to one end of a liquid transfer pipe. A pressure stabilizing tank is located at the front of the main body, near the valve bodies. The top of each pressure stabilizing tank is connected to the output end of a pump body via a pipe. A liquid injection needle is vertically mounted at the lower end of each pressure stabilizing tank, and a hydrocyclone is mounted on the outlet end of the injection needle.

[0006] As an improvement to the above solution, a micro-pressure sensor is also included, with micro-pressure sensors installed on both the output and input ends of the pump body.

[0007] As an improvement to the above scheme, it also includes intermediate receiving tanks and laminar flow screens. Intermediate receiving tanks are provided on the liquid transfer pipes. The intermediate receiving tanks are vertically arranged on the upper part of the main body of the equipment. Multiple laminar flow screens are evenly spaced from top to bottom inside the intermediate receiving tanks.

[0008] As an improvement to the above solution, it also includes a cleaning pump, a main pipe, and branch pipes. The cleaning pump is installed on the right side of the main body of the equipment. The output end of the cleaning pump is connected to the main pipe. The main pipe is equipped with multiple branch pipes. The number of branch pipes is the same as the number of pressure tanks. Each branch pipe is connected to a pipe on the output end of a pump body. A one-way valve is provided at the connection between the branch pipe and the pipe. The liquid delivered by the cleaning pump enters the pressure tank from the branch pipe.

[0009] As an improvement to the above solution, it also includes a cylinder, guide rails, a negative pressure suction plate, a waste liquid suction port, and a collection tank. Two guide rails are provided on the side of the main body of the equipment near the transmission line. A negative pressure suction plate is slidably installed between the guide rails, and a liquid transmission channel is provided inside it. A waste liquid suction port is opened on the front side of the negative pressure suction plate, and a collection tank is provided at the rear of the negative pressure suction plate. The liquid transmission channel connects the waste liquid suction port and the collection tank. An interface is provided at the rear of the collection tank. A cylinder is provided on the rear side of the main body of the equipment. The moving rod of the cylinder is connected to the negative pressure suction plate. When the moving rod of the cylinder extends or retracts, it will drive the negative pressure suction plate to move back and forth on the guide rails. When the negative pressure suction plate moves to the front limit position with the moving rod of the cylinder, the negative pressure suction plate will be located below the injection needle, and the hydrocyclone at the end of the injection needle will face the waste liquid suction port.

[0010] As an improvement to the above solution, it also includes a mounting bracket, with a mounting cavity opened on the upper rear side of the inner side of the equipment body, and a mounting bracket installed inside the mounting cavity.

[0011] Beneficial effects: 1. This utility model integrates a spiral guide at the front end of the injection needle, which causes the electrolyte to generate a swirling motion, breaking the path limitation of traditional single-point linear injection. Under the action of swirling, the electrolyte spreads evenly along the inner wall of the battery in 360°, completely covering the edge area of ​​the electrode, eliminating the problem of uneven wetting caused by local "dry areas". At the same time, the centrifugal force accelerates the discharge of air bubbles, significantly reducing the difference in lithium ion deposition on the electrode surface, effectively suppressing the risk of lithium plating, and improving battery safety and cycle life.

[0012] 2. This utility model adds a multi-stage laminar flow intermediate tank to the liquid transmission pipeline. The tank has a laminar flow sieve with gradually decreasing aperture from top to bottom. By gradually refining the electrolyte flow rate, the turbulent flow is forcibly converted into a stable laminar flow. The sieve has a cutting and adsorption effect on air bubbles, which eliminates the air bubbles. The electrolyte enters the injection needle in a uniform and gentle flow state, avoiding uneven local wetting caused by air bubble entrainment. At the same time, it reduces pipeline pressure pulsation, improves injection stability, and effectively ensures the consistency of battery performance.

[0013] 3. By setting up a backwashing mechanism, this utility model can automatically start the backwashing program when the liquid injection equipment is used up. The high-pressure reverse flow of cleaning fluid is used to thoroughly clean the liquid injection pipeline and nozzle, effectively preventing residual electrolyte from crystallizing and clogging the nozzle. The waste liquid after cleaning is collected and treated by a negative pressure suction plate to avoid cross-contamination and extend the equipment maintenance cycle. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0015] Figure 2 This is a three-dimensional structural diagram of the present invention, excluding the lifting base and transmission line.

[0016] Figure 3 This is a three-dimensional structural diagram of the liquid injection mechanism and the backwashing mechanism of this utility model.

[0017] Figure 4 This is a three-dimensional structural diagram of the pressure stabilizing tank, injection needle, and cyclone separator of this utility model.

[0018] Figure 5 This is a three-dimensional structural diagram of the collection mechanism of this utility model.

[0019] Figure 6 This is a three-dimensional structural diagram of the valve body, liquid transmission pipe, and intermediate tank of this utility model.

[0020] The components in the attached diagram are labeled as follows: 1-Main body of equipment, 2-Lifting seat, 3-Transmission line, 31-Mounting frame, 4-Valve body, 41-Liquid transfer pipe, 5-Pump body, 6-Pressure stabilizing tank, 61-Injection needle, 7-Hydrocyclone, 8-Micro pressure sensor, 9-Cleaning pump, 91-Main pipe, 92-Branch pipe, 93-Cylinder, 94-Guide rail, 95-Negative pressure suction plate, 950-Waste liquid suction port, 951-Collection tank, 10-Intermediate receiving tank, 101-Laminar flow screen. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0022] Example 1

[0023] A battery electrolyte filling device, such as Figure 1-6As shown, the device includes a main body 1, a lifting seat 2, a transmission line 3, a valve body 4, a liquid transfer pipe 41, a pump body 5, a pressure stabilizing tank 6, an injection needle 61, and a hydrocyclone 7. The main body 1 is equipped with a control panel that clearly displays various operating parameters, such as liquid supply flow rate, pressure, temperature, as well as the device's operating mode and remaining working time. Operators can monitor and understand the device's operating status in real time through the control panel and adjust parameters as needed. The lower part of the main body 1 has a lifting seat 2 composed of a lifting component and a support platform. The vertical extension and retraction of the lifting component drives the support platform to rise and fall, adapting to the positioning requirements of battery casings of different heights. The upper part of the lifting seat 2 is equipped with a transmission line 3, which adopts a multi-row synchronous belt pulley drive structure. A servo motor drives the battery tray to intermittently step along the guide rail, achieving precise stopping and continuous transfer of batteries at the injection station. Multiple valve bodies 4 are arranged horizontally on the upper part of the main body 1. The inlet connector of 4 is connected to the external liquid supply pipeline through a quick-connect interface, and the outlet connector is fixed to the liquid transmission pipe 41 by a flange seal. Multiple valve bodies are independently controlled to realize multi-channel switching or parallel liquid injection mode of electrolyte. The other end of the liquid transmission pipe 41 is connected to the input end of the metering pump body 5 in the upper part of the main body 1 by a flexible hose. The pump body 5 is a high-precision plunger metering pump. The piston is driven by a servo motor to reciprocate and deliver the electrolyte to the pressure stabilizing tank 6 with an accuracy of ±0.5mL / s. The pressure stabilizing tank 6 is rigidly connected to the output end of the pump body 5 through the top flange. It is equipped with a buffer baffle with damping holes inside, which can convert the pulsating flow output by the pump body into a stable laminar flow. It is connected to the injection needle 61 through the bottom conical contraction port. The end of the tank is coaxially nested with a hydrocyclone 7. The inner cavity of the hydrocyclone 7 is machined with a spiral guide block with a 45° tilt angle. When the electrolyte flows through, it is guided by the spiral to form a centrifugal vortex, which forces the electrolyte to spray out from the injection needle outlet in a spiral diffusion form.

[0024] The working principle of this utility model is as follows: When the battery electrolyte filling equipment is working, the battery tray containing the workpiece to be filled is first placed on the transmission line 3. The lifting seat 2 performs its height adjustment function. Under the precise command of the control system, the internal lifting component drives the tray to move vertically. According to the different specifications of the battery to be filled, the height position of the battery tray is precisely adjusted so that the liquid injection port of the battery shell can be concentrically aligned with the liquid injection position of the liquid injection needle 61, providing a basic guarantee for the subsequent accurate filling of electrolyte. At the same time, the transmission line 3 starts to operate, and the servo motor, as the power source, drives the battery tray along the preset guide. The track performs intermittent stepping motion. During each step, it transports the battery to be injected to the designated injection station and uses a high-precision positioning device to accurately position the battery, ensuring that the battery maintains a stable posture during the injection process. After the battery position and posture are adjusted, the external liquid supply device starts working, continuously supplying electrolyte to the liquid transfer pipe 41 through the liquid inlet connector of the valve body 4. The liquid inlet and outlet connectors on the valve body 4 can flexibly connect the external liquid supply device and the liquid transfer pipe 41, realizing multi-channel delivery and distribution of electrolyte. The liquid transfer pipe 41 stably transmits the electrolyte to the metering pump body 5 in the upper part of the main body 1. As a key component for electrolyte delivery, the metering pump body 5 adopts a high-precision plunger metering pump structure. Under the precise control of the servo motor, the piston reciprocates, quantitatively extracting electrolyte from the liquid transfer pipe 41 with extremely high precision and delivering it to the pressure stabilizing tank 6.

[0025] After receiving the electrolyte from the metering pump 5, the pressure stabilizing tank 6 transforms the pulsating flow output by the pump into a stable laminar flow, effectively reducing pressure fluctuations and flow instability during electrolyte delivery. The stabilized electrolyte flows smoothly into the injection needle 61 through the conical constriction port at the bottom of the pressure stabilizing tank 6. The injection needle 61 is made of stainless steel tubing, possessing excellent corrosion resistance and sealing properties, ensuring no leakage of the electrolyte during transmission. Once the electrolyte enters the injection needle 61, it flows into the coaxially nested hydrocyclone 7. The hydrocyclone 7 has a carefully machined 45° inclined spiral guide block inside. As the electrolyte flows through the hydrocyclone 7, it is guided by the spiral to form a centrifugal vortex. This centrifugal vortex causes the electrolyte to spray out from the outlet of the injection needle 61 in a spiral diffusion pattern, evenly covering the surface of the battery electrodes, ensuring a more uniform distribution of the electrolyte on the electrodes. Simultaneously, the centrifugal force generated by the vortex separates air bubbles to the center of the flow channel and breaks them up, effectively preventing the air bubbles from affecting battery performance.

[0026] Example 2

[0027] Based on Example 1, such as Figure 1 , Figure 3 and Figure 6As shown, it also includes an intermediate receiving tank 10 and a laminar flow screen 101. The intermediate receiving tank 10 is provided on each of the liquid transfer pipes 41. The intermediate receiving tank 10 is tightly connected to the liquid transfer pipe 41 through a transition pipe with a flange connection. The transition pipe is made of high-strength corrosion-resistant alloy of the same material as the liquid transfer pipe 41 to ensure good sealing at the connection and no risk of leakage. A rubber sealing gasket is also provided at the flange connection to further enhance the sealing performance. The intermediate receiving tank 10 is vertically arranged on the upper part of the main body 1 of the equipment. Its bottom is firmly fixed to the main body 1 of the equipment through a support frame to ensure the stability of the intermediate receiving tank 10 during operation. Multiple laminar flow screens 101 are evenly arranged from top to bottom inside the intermediate receiving tank 10. The laminar flow screens 101 are fixed to the inner wall of the intermediate receiving tank 10 by welding or snap-fit ​​to ensure that the laminar flow screens 101 will not shake or shift during the flow of electrolyte.

[0028] Before entering the pump body 5, the electrolyte first passes through the interior of the intermediate receiving tank 10, and then flows sequentially from top to bottom through the multi-layer laminar flow screen 101 within the intermediate receiving tank 10. The laminar flow screen 101 adopts a gradient aperture design, that is, the aperture of the upper screen is larger than that of the lower screen. When the electrolyte enters the intermediate receiving tank 10 at a certain speed and pressure, it first comes into contact with the upper large-aperture laminar flow screen 101. Due to the larger aperture, the electrolyte can pass through relatively smoothly. At this time, some larger turbulent bubbles will be initially dispersed and broken when passing through the large-aperture screen. As the electrolyte continues to flow downward, it passes through the gradually decreasing aperture screen. In the small laminar flow sieve 101, liquid molecules in the electrolyte encounter greater resistance when passing through the smaller pore size, and the flow velocity gradually becomes uniform. Meanwhile, bubbles are continuously squeezed and broken down as they pass through different pore sizes, gradually becoming smaller. Specifically, the large-pore sieve first performs preliminary filtration and buffering of the electrolyte, gradually stabilizing the flow state of the electrolyte. Then, the small-pore sieve further performs fine filtration and rectification of the electrolyte, completely eliminating residual turbulent bubbles. In this way, turbulent bubbles can be effectively prevented from entering the pump body 5, preventing bubbles from affecting the metering accuracy of the pump body 5.

[0029] like Figure 1 and Figure 3As shown, the pump body 5 also includes a micro-pressure sensor 8. Micro-pressure sensors 8 are installed at both the output and input ends of the pump body 5. Specifically, at the input end of the pump body 5, the micro-pressure sensor 8 is tightly connected to the inlet of the pump body 5 via a finely designed connecting pipe. This connecting pipe is made of stainless steel, providing excellent sealing and corrosion resistance, ensuring that the sensor accurately senses the pressure of the electrolyte entering the pump body 5. At the output end of the pump body 5, the micro-pressure sensor 8 operates based on a high-precision pressure sensing chip. When the electrolyte flows under the action of the pump body 5, the input micro-pressure sensor 8 monitors the pressure value of the electrolyte entering the pump body in real time and converts the pressure signal into an electrical signal, transmitting it to the equipment's control system. The output micro-pressure sensor 8 senses the pressure value of the electrolyte output from the pump body 5 in real time and similarly converts the pressure signal into an electrical signal, feeding it back to the control system. Based on the pressure signals fed back by these two micro-pressure sensors 8, the control system accurately calculates the flow rate change of the electrolyte within the pump body 5. Because there is a specific mathematical relationship between flow rate and parameters such as pressure and pipe cross-sectional area, precise analysis of the pressure signal enables accurate control of the metered flow rate. In this way, the micro-pressure sensor 8 effectively compensates for the potential inaccuracies of relying solely on the pump body 5 for control, greatly improving the accuracy of flow metering during electrolyte filling. This ensures that each battery receives an accurate dose of electrolyte, thereby enhancing the overall performance and consistency of the batteries.

[0030] like Figure 1 and Figure 3 As shown, the system also includes a cleaning pump 9, a main pipe 91, and branch pipes 92. The cleaning pump 9 is bolted to the right side of the main body 1. The main pipe 91 is tightly connected to the output end of the cleaning pump 9 via a flange. A rubber sealing gasket is installed at the flange connection to ensure no leakage. The main pipe 91 is made of stainless steel, which has good corrosion resistance and pressure resistance. It has multiple branch pipes 92, the number of which is the same as the number of pressure tanks 6. Each branch pipe 92 is connected to a pipe on the output end of the pump body 5 via a tee connector. Each connection between the branch pipe 92 and the pipe is equipped with a check valve. The check valve only allows liquid to flow from the branch pipe 92 to the pipe, preventing backflow. When the cleaning pump 9 is working, the liquid it delivers (usually cleaning fluid) flows from the main pipe 91 into each branch pipe 92, and then through the check valve into the pressure tank 6. This connection method allows the cleaning fluid to be accurately delivered to each pressure tank 6. The one-way valve ensures unidirectional flow during the cleaning process, preventing backflow of the cleaning fluid from damaging the cleaning pump 9. It also ensures that each pressure tank 6 is thoroughly cleaned, effectively removing residual electrolyte and other impurities from the pressure tank 6, thus improving the cleanliness of the equipment and the stability of its subsequent use.

[0031] Among them, such as Figure 1 , Figure 2 and Figure 5 As shown, it also includes a cylinder 93, guide rails 94, a negative pressure suction plate 95, a waste liquid suction port 950, and a collection tank 951. Two guide rails 94 are welded and fixed to the side of the main body 1 near the transmission line 3. A negative pressure suction plate 95 slides between the guide rails 94. Sliding blocks matching the guide rails 94 are provided on both sides of the negative pressure suction plate 95. The sliding blocks fit tightly against the guide rails 94, allowing the negative pressure suction plate 95 to slide smoothly on the guide rails 94. A liquid transfer channel is provided inside the negative pressure suction plate 95, and multiple suction ports 95 are opened on the front side of the negative pressure suction plate 95. 0. The shape and size of the waste liquid suction port 950 match the hydrocyclone 7 at the end of the injection needle 61. When the negative pressure suction plate 95 moves to the designated position, it can accurately align with the hydrocyclone 7. The rear of the negative pressure suction plate 95 is provided with a liquid collection tank 951. The liquid collection tank 951 is made of transparent plastic material, which makes it easy to observe the collection of waste liquid. The liquid transfer channel connects the waste liquid suction port 950 and the liquid collection tank 951. The rear of the liquid collection tank 951 is provided with an interface, including a drain interface for discharging the collected waste liquid and a negative pressure interface for connecting a negative pressure device to generate negative pressure suction. A cylinder 93 is fixedly mounted on the rear side of the main body 1 via a bracket. The movable rod of the cylinder 93 is connected to the negative pressure suction plate 95 via a connector. The connector is designed with an adjustable length to facilitate adjustment of the initial position of the negative pressure suction plate 95. When the movable rod of the cylinder 93 extends or retracts, it drives the negative pressure suction plate 95 to move back and forth on the guide rail 94. The guide rail 94 provides a stable moving path for the negative pressure suction plate 95, ensuring the smoothness and accuracy of the movement. When the negative pressure suction plate 95 moves to the front limit position with the movable rod of the cylinder 93, the negative pressure suction plate 95 will be located below the injection needle 61, and the hydrocyclone 7 at the end of the injection needle 61 will face the waste liquid suction port 950. At this time, a negative pressure device is connected through the negative pressure interface, which generates negative pressure in the collection tank 951. Under the action of negative pressure, the waste liquid enters the liquid transfer channel from the hydrocyclone 7 through the waste liquid suction port 950 and finally flows into the collection tank 951. This design can collect the waste liquid generated during the cleaning process in a timely and effective manner, prevent the waste liquid from dripping and contaminating the equipment and working environment, improve the cleanliness of the equipment and production efficiency, and at the same time, the transparent design of the collection tank 951 makes it easy for staff to observe the waste liquid collection at any time and clean it in a timely manner.

[0032] In addition, such as Figure 2 As shown, it also includes a mounting bracket 31. An installation cavity is opened on the upper rear side of the inner side of the main body 1, and the mounting bracket 31 (for installing liquid supply components, integrated) is provided in the installation cavity.

[0033] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A battery electrolyte filling device, comprising a device body (1) and a control panel on the device body (1); Its characteristics are: It also includes a lifting seat (2), a transmission line (3), a valve body (4), a liquid transfer pipe (41), a pump body (5), a pressure stabilizing tank (6), a liquid injection needle (61), and a hydrocyclone (7). The lower part of the main body (1) is provided with a lifting seat (2), and the upper part of the lifting seat (2) is equipped with a transmission line (3). Multiple valve bodies (4) are arranged on the upper part of the main body (1). Each valve body (4) is provided with an inlet connector and an outlet connector. The inlet connector of the valve body (4) is used to connect to an external liquid supply device, and the outlet connector of the valve body (4) is equipped with a liquid transfer pipe. (41) Multiple pump bodies (5) are provided in the upper part of the main body (1) of the equipment. The number of pump bodies (5) is the same as the number of valve bodies (4). The input end of each pump body (5) is connected to one end of a liquid transfer pipe (41). A pressure stabilizing tank (6) is provided in the front part of the main body (1) near the side of the valve body (4). The top of each pressure stabilizing tank (6) is connected to the output end of a pump body (5) through a pipe. A liquid injection needle (61) is vertically provided at one end of the lower part of the pressure stabilizing tank (6). A cyclone separator (7) is provided on the liquid outlet end of the liquid injection needle (61).

2. The battery electrolyte filling device according to claim 1, characterized in that: It also includes a micro pressure sensor (8), and the pump body (5) is equipped with a micro pressure sensor (8) at both the output and input ends.

3. The battery electrolyte filling device according to claim 2, characterized in that: It also includes an intermediate receiving tank (10) and a laminar flow screen (101). The intermediate receiving tank (10) is provided on the pipeline of the liquid transfer pipe (41). The intermediate receiving tank (10) is vertically arranged on the upper part of the main body of the equipment (1). Multiple laminar flow screens (101) are evenly arranged from top to bottom in the intermediate receiving tank (10).

4. The battery electrolyte filling device according to claim 3, characterized in that: It also includes a cleaning pump (9), a main pipe (91) and branch pipes (92). The cleaning pump (9) is installed on the right side of the main body (1). The output end of the cleaning pump (9) is connected to the main pipe (91). The main pipe (91) is provided with multiple branch pipes (92). The number of branch pipes (92) is the same as the number of pressure tanks (6). Each branch pipe (92) is connected to a pipe on the output end of a pump body (5). A one-way valve is provided at the connection between the branch pipe (92) and the pipe. The liquid delivered by the cleaning pump (9) enters the pressure tank (6) from the branch pipe (92).

5. The battery electrolyte filling device according to claim 4, characterized in that: It also includes a cylinder (93), a guide rail (94), a negative pressure suction plate (95), a waste liquid suction port (950), and a collection tank (951). Two guide rails (94) are provided on the side of the main body (1) near the transmission line (3). A negative pressure suction plate (95) is slidably provided between the guide rails (94), and a liquid transmission channel is provided inside it. A waste liquid suction port (950) is opened on the front side of the negative pressure suction plate (95), and a collection tank (951) is provided at the rear of the negative pressure suction plate (95). The liquid transmission channel connects the waste liquid suction port (950) and the collection tank (951). The liquid collection tank (951) has an interface at the rear. The main body of the equipment (1) has a cylinder (93) at the rear. The moving rod of the cylinder (93) is connected to the negative pressure suction plate (95). When the moving rod of the cylinder (93) extends and retracts, it will drive the negative pressure suction plate (95) to move back and forth on the guide rail (94). When the negative pressure suction plate (95) moves to the front limit position with the moving rod of the cylinder (93), the negative pressure suction plate (95) will be located below the injection needle (61), and the hydrocyclone (7) at the end of the injection needle (61) will face the waste liquid suction port (950).

6. The battery electrolyte filling device according to claim 5, characterized in that: It also includes a mounting bracket (31), and a mounting cavity is opened on the upper rear side of the inner side of the main body of the equipment (1), and the mounting bracket (31) is provided in the mounting cavity.

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