Lead acid battery acid extraction device and method

Abstract

The application provides a lead-acid battery acid extraction device and method, and relates to the technical field of battery production. The acid extraction device comprises an acid extraction assembly and a mounting assembly. Each acid extraction assembly comprises an acid extraction pipe, a protective sleeve and a first ultrasonic transducer. One end of the acid extraction pipe is connected to a negative pressure source, and the other end is inserted into a battery cell groove. An acid liquid flow channel is formed between the protective sleeve and the acid extraction pipe. The ultrasonic transducer is used to separate the bubbles in the pores of the separator by vibration. The mounting assembly comprises a mounting plate, and a plurality of gas path chambers are arranged on the plate and are in sealed connection with the acid injection holes of the battery. An exhaust port and a pressurizing port are arranged on the gas path chambers and are used to control the exhaust of gas and the input of high-pressure gas, respectively, so as to pressurize the acid liquid to penetrate the pores of the separator. The bubbles in the separator are removed by ultrasonic vibration, and the acid liquid is fully penetrated in the separator by pressurization, so that efficient acid extraction operation under non-static conditions is realized, the amount of acid liquid in each cell groove is uniform, and therefore, the production efficiency and performance consistency of the battery are greatly improved.

Description

TECHNICAL FIELD

[0001] The application relates to the production technology of lead-acid batteries, in particular to a lead-acid battery acid extraction device and method. BACKGROUND

[0002] The lead-acid battery is an important power supply device in the fields of automobile starting and energy storage system, and the formation link in its production process is particularly critical. In this link, electrolyte (sulfuric acid solution) needs to be injected into the battery grid slot and the active material of the plate is activated through charge-discharge reaction. However, the gas generated in the formation process will push part of the acid liquid to the grid slot above the separator, and at the same time, cause the residual bubbles in the pores of the separator, so that the acid liquid in the separator is not fully filled and the saturation degree is insufficient. In order to ensure the consistency of the battery performance, the battery needs to be placed after formation to promote the bubbles to be discharged and the acid liquid to be fully absorbed by the separator. At present, the industry generally relies on natural standing method, which usually needs to be continued for 24 to 48 hours to ensure that the acid liquid in each grid slot is evenly distributed.

[0003] However, this traditional standing process has obvious defects: the too long standing time seriously restricts the production efficiency, not only prolongs the production cycle, increases the time and equipment cost, but also causes the production line to be delayed, which limits the overall production capacity.

[0004] In addition, the traditional acid extraction process after standing is usually manually inserting multiple acid extraction pipes into the acid injection holes of the battery to extract the free acid in the grid slot. This operation has a large human influence factor and may cause the acid extraction amount in multiple grid slots to be inconsistent. In terms of performance, inconsistent acid amount will affect the electrode potential of the battery, and then cause the voltage difference between single batteries. In the charging and discharging process, the battery with high voltage may be overcharged, and the battery with low voltage may not be fully charged or be over-discharged. This not only affects the normal use of the battery pack, but also may damage the battery.

[0005] In terms of life, the battery with less acid is more likely to have problems such as plate sulfuration and dryness in the charging and discharging process, thereby accelerating the aging of the battery. The battery with too much acid may face the problem of over-corrosion of the electrode, which also affects its life.

[0006] CONTENT

[0007] Therefore, the application provides a lead-acid battery acid extraction device and method, which aims to solve the problem of low production efficiency caused by the traditional acid extraction method after standing in the formation process of the storage battery and the uneven distribution of acid amount in multiple grid slots of the battery.

[0008] The technical scheme of the application is implemented as follows:

[0009] On the one hand, the application provides a lead-acid battery acid extraction device, which comprises:

[0010] The acid extraction assembly is provided with a plurality of acid extraction pipes, a protective sleeve and a first ultrasonic transducer. One end of the acid extraction pipe is connected to a negative pressure source, the other end passes through the acid injection hole of the battery and is inserted into the grid slot of the battery. The acid extraction pipe is in clearance fit with the acid injection hole. The protective sleeve is coaxially fixed to the inside of the bottom of the acid extraction pipe, and an annular channel for acid flow is formed between the protective sleeve and the acid extraction pipe. The first ultrasonic transducer is arranged in the protective sleeve and used to transmit vibration to the acid in the grid slot to separate the bubbles in the pores of the separator.

[0011] The installation assembly includes a mounting plate. A plurality of independent air path cavities are arranged on the bottom surface of the mounting plate along the length direction. Each air path cavity is in sealed connection with the acid injection hole of the battery. One end of the acid extraction pipe, away from the protective sleeve, passes through the air path cavity and extends to the top surface of the mounting plate. The air path cavity is in communication with the corresponding battery grid slot through the acid injection hole. An exhaust port and a pressurizing port are respectively arranged on the side wall of each air path cavity. The exhaust port is provided with a first electromagnetic valve to control the exhaust of gas in the grid slot. The pressurizing port is provided with a second electromagnetic valve to control the input of high-pressure gas into the grid slot. The high-pressure gas is used to drive the acid liquid to pressurize and infiltrate the separator.

[0012] On the basis of the above technical scheme, preferably, a first connecting pipe is arranged at the exhaust port, the first electromagnetic valve is arranged on the first connecting pipe, and an airflow sensor is further arranged on the first connecting pipe between the first electromagnetic valve and the exhaust port. A second connecting pipe is arranged at the pressurizing port, the second electromagnetic valve is arranged on the second connecting pipe, and a gas pressure sensor is further arranged on the second connecting pipe between the second electromagnetic valve and the pressurizing port.

[0013] On the basis of the above technical scheme, preferably, at least a part of the protective sleeve extends out of the bottom surface of the acid extraction pipe. The distance between the bottom surface of the protective sleeve and the bottom surface of the acid extraction pipe is 1mm-5mm. A plurality of connecting ribs are uniformly arranged on the outer peripheral wall of the protective sleeve, and the two ends of each connecting rib are fixedly connected with the outer wall of the protective sleeve and the inner wall of the acid extraction pipe.

[0014] On the basis of the above technical scheme, preferably, the installation assembly further includes a fixing frame fixedly arranged above the mounting plate. The upper end of the acid extraction pipe vertically passes through the mounting plate and above the fixing frame. The acid extraction pipe and the mounting plate are in dynamic sealing connection. The fixing frame is provided with a lifting module for driving the acid extraction pipe to move up and down.

[0015] On the basis of the above technical scheme, preferably, the acid extraction assembly further includes a liquid level sensor and a distance measuring sensor. Both the liquid level sensor and the distance measuring sensor are fixedly arranged on the outer wall of the acid extraction pipe. The liquid level sensor is used to detect the liquid level at the top of the battery grid slot. The distance measuring sensor is used to detect the distance between the protective sleeve and the bottom surface of the separator.

[0016] On the basis of the above technical scheme, preferably, the ultrasonic assembly is symmetrically provided with two groups, and is located at both sides of the installation plate in the width direction, the ultrasonic assembly comprises a translation module and a plurality of second ultrasonic transducers, the plurality of second ultrasonic transducers are arranged at intervals along the length direction of the installation plate, and each second ultrasonic transducer corresponds to the position of the grid slot of the storage battery, and the translation module is horizontally fixedly arranged on the fixing frame and is used for driving the second ultrasonic transducer to move horizontally to contact the outer wall of the grid slot of the storage battery.

[0017] On the basis of the above technical scheme, preferably, a negative pressure suction pipe is further arranged on the first connecting pipe between the first electromagnetic valve and the airflow sensor, and is used for connecting a negative pressure source.

[0018] In a second aspect, the application further discloses a lead-acid battery acid extraction method, which utilizes the lead-acid battery acid extraction device of the first aspect and comprises the following steps:

[0019] S1, respectively inserting the acid extraction pipes into the grid slots of the storage battery, placing the installation plate on the top surface of the installation plate, ensuring that the gas path chamber and the acid injection hole of the storage battery are sealingly connected, and adjusting the depth of the acid extraction pipe in the grid slot;

[0020] S2, closing the negative pressure source of the acid extraction pipe and the second electromagnetic valve, opening the first electromagnetic valve, starting the ultrasonic transducer, using ultrasonic energy to drive the bubbles in the separator to separate and be discharged from the exhaust port, and detecting the gas flow of the exhaust port by the airflow sensor to determine whether the bubble separation is completed;

[0021] S3, when the airflow sensor detects that the gas flow is lower than the threshold value and is stable, it is determined that the bubble separation is completed, the first electromagnetic valve is closed, the second electromagnetic valve is opened, and high-pressure gas is input into the grid slot in stages through the pressurizing port, and the high-pressure gas is used to drive the acid liquid to pressurize and infiltrate the separator;

[0022] S4, when the pressure sensor detects that the pressure value in the grid slot is lower than the threshold value and is stable, the pressurizing action is ended, the first electromagnetic valve is opened, and the negative pressure source is opened to extract the acid liquid through the acid extraction pipe, and the acid extraction is stopped when the liquid surface is lowered to a predetermined value.

[0023] On the basis of the above technical scheme, preferably, step S2 further comprises: when the gas flow is lower than the preset threshold value, the power of the first ultrasonic transducer is increased to an enhanced power sufficient to accelerate the bubble separation, and the airflow change rate is monitored in real time; if the airflow change rate is below the preset safety threshold value, the first electromagnetic valve is closed.

[0024] On the basis of the above technical scheme, preferably, the staged pressurization in step S3 comprises:

[0025] In the initial pressurization phase, the gas pressure is raised to a first pressure at a first rate and maintained for a first time period, during which the gas pressure is used to fill large-size pores in the separator;

[0026] In the increasing pressure phase, when the initial pressurization phase ends, if the pressure fluctuation value is detected to exceed a first preset threshold, the gas pressure is raised to a second pressure at a second rate less than the first rate, the second pressure being greater than the first pressure, and maintained for a second time period longer than the first time period, driving the acid liquid to penetrate into the medium-size pores;

[0027] In the equilibrium phase, when the pressure fluctuation value in the increasing pressure phase is less than or equal to a second preset threshold, the gas pressure is lowered to a third pressure less than the first pressure and maintained for a third time period, until the gas pressure sensor data is continuously stable for a fourth time period, and the pressurization is ended, to inhibit the micro-pore acid liquid backflow.

[0028] The present application has the following beneficial effects over the prior art:

[0029] (1) The acid extraction device disclosed in the present application, by adopting the combination design of the acid extraction assembly and the mounting assembly, especially by using ultrasonic vibration to quickly discharge the bubbles in the pores of the separator, and by pressurizing to make the acid liquid fully penetrate into the pores of the separator, high-efficiency acid extraction operation under non-static conditions is realized, the acid liquid amount in each cell is uniform, and thus the production efficiency and performance consistency of the storage battery are greatly improved.

[0030] (2) By extending at least a part of the protective sleeve out of the bottom surface of the acid extraction pipe, the protective sleeve can be as close as possible to the separator in the acid liquid, when the first ultrasonic transducer is working, the vibration can be more effectively transmitted to the separator, accelerating the discharge of bubbles in the pores of the separator. At the same time, the part of the protective sleeve extending out of the bottom surface of the acid extraction pipe can make the outer peripheral side of the first ultrasonic transducer fully contact the acid liquid, and by transmitting vibration energy to the acid liquid, on the one hand, the bubble discharge efficiency in the separator can be improved, and on the other hand, when the bubbles float to the liquid surface and gather, due to the diffusion of vibration energy in the acid liquid, the rupture of bubbles on the liquid surface can be accelerated, so that the bubbles can be quickly discharged.

[0031] (3) By setting the fixing frame and the lifting module, the depth of the acid extraction pipe in the cell can be flexibly adjusted, so as to control the distance between the protective sleeve and the separator, and ensure that the first ultrasonic transducer has a safe distance from the separator, while avoiding contact vibration to damage the top of the separator, the ultrasonic energy can be effectively applied to the separator, and the bubble discharge efficiency of the separator is improved.

[0032] (4) By setting multiple second ultrasonic transducers outside the battery, combined with the first ultrasonic transducer at the bottom of the acid extraction pipe, the ultrasonic vibration frequency can be greatly improved, cavitation effect can be generated by high frequency vibration, which can effectively separate and discharge the gas bubbles in the separator, so that the acid liquid can be more uniformly infiltrated into the separator, ensuring that the acid liquid adsorption in each cell is consistent, and then the overall performance and consistency of the battery is improved.

[0033] (6) The acid extraction method disclosed in the present application separates the gas bubbles in the separator by ultrasonic driving, and realizes the full penetration and absorption of the acid liquid in the cell in the pores of the separator by using high-pressure gas pressurization. Compared with the traditional method of realizing the emptying of the separator gas bubbles and the absorption of the acid liquid in the separator by static means, the present application realizes the emptying of the separator gas bubbles by active method and the absorption of the acid liquid in the separator by pressurization, greatly reducing the time consumption caused by static means after formation, improving the acid extraction efficiency of the battery after formation, and improving the production efficiency of the battery. At the same time, by monitoring the exhaust process, the pressurization process and the acid extraction process in real time, the whole production process can have high-precision operation, which can automatically adjust the steps according to the real-time situation, so as to avoid the influence of human operation errors or improper operation on the battery, and at the same time ensure that the acid content in the separator and the remaining acid content in the cell after acid extraction meet the requirements, ensure that the acid content in each cell of the battery is consistent, and improve the performance consistency of the battery.

[0034] (7) By precisely controlling the lifting rate and time of the gas pressure, the acid liquid can be infiltrated into different pore sizes at different stages. This phased pressurization method effectively ensures the depth and uniformity of acid liquid infiltration, while avoiding the common backflow phenomenon, ensuring that the acid liquid infiltrates uniformly in the separator, ensuring that the acid content in each cell of the separator is uniform, and finally by controlling the amount of acid extraction, the liquid level after acid extraction in each cell is consistent, which can ensure that the acid content in all cells of the battery is consistent, and improve the performance consistency of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0036] Figure 1 Schematic diagram of internal structure of the lead-acid battery disclosed by the present application;

[0037] Figure 2 Schematic diagram of three-dimensional structure of the lead-acid battery acid extraction device and the lead-acid battery assembly structure disclosed by the present application;

[0038] Figure 3 Schematic diagram of structure of the lead-acid battery acid extraction device without the ultrasonic assembly disclosed by the present application;

[0039] Figure 4 Schematic diagram of three-dimensional structure of the lead-acid battery acid extraction device disclosed by the present application;

[0040] Figure 5 Top view of the lead-acid battery acid extraction device disclosed by the present application;

[0041] Figure 6 Schematic diagram of three-dimensional structure of the lead-acid battery acid extraction device disclosed by the present application; Figure 5 Schematic diagram of three-dimensional structure of the lead-acid battery acid extraction device disclosed by the present application;

[0042] Figure 7 Schematic diagram of three-dimensional structure of the lead-acid battery acid extraction device disclosed by the present application; Figure 5 Schematic diagram of three-dimensional structure of the lead-acid battery acid extraction device disclosed by the present application;

[0043] Figure 8 Schematic diagram of internal structure of the lead-acid battery acid extraction device disclosed by the present application;

[0044] Reference signs:

[0045] 1, lead-acid battery; 10, box body; 11, box cover; 110, acid injection hole; 101, groove; 12, partition plate; 13, plate; 2, acid extraction assembly; 21, acid extraction pipe; 22, protective sleeve; 23, first ultrasonic transducer; 210, annular channel; 211, connecting rib; 24, liquid level sensor; 25, distance measuring sensor; 3, mounting assembly; 31, mounting plate; 311, air path chamber; 3111, exhaust port; 3112, pressurizing port; 3113, first electromagnetic valve; 3114, second electromagnetic valve; 3115, first connecting pipe; 3116, air flow sensor; 3117, second connecting pipe; 3118, air pressure sensor; 3119, negative pressure suction pipe; 32, fixing frame; 33, lifting module; 4, ultrasonic assembly; 41, translation module; 42, second ultrasonic transducer. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0047] As shown in Figure 1 combination with Figures 2-7 , the present application discloses a lead-acid battery acid extraction device, comprising an acid extraction assembly 2 and a mounting assembly 3.

[0048] Among them, the acid extraction assembly 2 is provided with multiple, the number of which corresponds to the number of grid slots 101 of the storage battery 1, so as to respectively extract the excess acid liquid in the grid slots 101 through the acid extraction assembly 2. The present embodiment shows a specification of the storage battery 1, which has 5 grid slots 101, and the number of acid extraction assemblies 2 is set to 5. In the present embodiment, the storage battery 1 comprises a box body 10 and a box cover 11, and the grid slots 101 are arranged along the length direction of the box body 10 and located inside the box body 10, and the acid injection hole 110 is located on the box cover 11.

[0049] The acid extraction assembly 2 of the present embodiment comprises an acid extraction pipe 21, one end of which is used for connecting a negative pressure source, the other end of which penetrates through the acid injection hole 110 of the storage battery 1 and is inserted into the grid slot 101 of the storage battery 1, and the acid extraction pipe 21 is gap-fitted with the acid injection hole 110. In this way, the lower end of the acid extraction pipe 21 is inserted into the grid slot 101 and immersed below the acid liquid, and the excess acid liquid in the grid slot 101 is extracted under the negative pressure of the external negative pressure source, and at the same time of acid extraction, the external air can enter the inside of the grid slot 101 from the acid injection hole 110 due to the gap-fitting between the acid extraction pipe 21 and the acid injection hole 110, so as to balance the pressure in the grid slot 101 of the storage battery 1 with the external pressure, ensure the smooth progress of the acid extraction process, and avoid the adsorbed acid in the separator 12 being extracted together during the acid extraction process.

[0050] In the prior art, the acid extraction link is usually carried out after the storage battery 1 is acidified and stands for 24-48 hours. After a long standing time, the bubbles in the separator 12 have been basically eliminated, and the free acid above the grid slot 101 slowly falls under the action of gravity and is fully adsorbed by the separator 12 to reach acid liquid saturation, at which time the excess acid liquid above the grid slot 101 can be extracted by the acid extraction device.

[0051] However, the excessively long standing time is an important factor affecting the production efficiency of the storage battery 1. In order to reduce the standing time and improve the production efficiency, while ensuring that the acid amount is uniform in each grid slot 101 of the storage battery 1, the present embodiment realizes acid extraction under non-standing conditions while ensuring uniform acid amount, and the specific implementation means is as follows.

[0052] The acid extraction assembly 2 of the embodiment further comprises a protective sleeve 22 and a first ultrasonic transducer 23, wherein the protective sleeve 22 is coaxially fixed to the inside of the bottom of the acid extraction pipe 21, and an annular channel 210 for the flow of acid liquid is formed between the protective sleeve 22 and the acid extraction pipe 21; the first ultrasonic transducer 23 is arranged in the protective sleeve 22 and used to transmit vibration to the grid groove 101 to separate the bubbles in the pores of the separator 12.

[0053] With the above technical scheme, after the charge and discharge formation is completed, no standing operation is performed, the lower end of the acid extraction pipe 21 is inserted into the acid liquid in the grid groove 101, vibration is first transmitted to the acid liquid in the grid groove 101 by the first ultrasonic transducer 23, the ultrasonic vibration can make the bubbles in the pores of the separator 12 quickly separate, the separated bubbles are discharged from the top surface of the acid liquid and discharged to the outside from the acid injection hole 110, and it is ensured that the subsequent acid liquid can penetrate and fill into the pores of the separator 12.

[0054] In the embodiment, the protective sleeve 22 is made of a corrosion-resistant material, preferably polytetrafluoroethylene, which can protect the first ultrasonic transducer 23 from damage caused by the acid liquid. The protective sleeve 22 is coaxially fixed to the inside of the lower part of the acid extraction pipe 21, and the annular channel 210 between the protective sleeve 22 and the acid extraction pipe 21 facilitates the smooth discharge of the acid liquid along the annular channel 210 during subsequent acid extraction.

[0055] Because of the gap fit between the acid extraction pipe 21 and the acid injection hole 110, the acid extraction assembly 2 cannot maintain a stable state in the grid groove 101, and when the bubbles in the separator 12 are discharged, the pores in the separator 12 do not fully absorb the acid liquid. At this time, directly performing acid extraction will result in less adsorption of acid in the separator 12, reducing the amount of acid in the entire grid groove 101 and affecting the performance of the battery.

[0056] In order to realize that multiple acid extraction assemblies 2 can maintain a stable position in each grid groove 101 and that the acid liquid can be fully adsorbed by the separator 12, the acid extraction device of the embodiment further comprises a mounting assembly 3 to solve the above problems.

[0057] Specifically, the installation assembly 3 comprises an installation plate 31, a plurality of independent air path chambers 311 are arranged on the bottom surface of the installation plate 31 in a length direction, each air path chamber 311 is in sealed connection with the acid injection hole 110 of the battery 1, and the acid extraction pipe 21 extends to the top surface of the installation plate 31 through the air path chamber 311 away from the protective sleeve 22. In this way, the acid extraction pipe 21 vertically passes through the air path chamber 311, and the position of the acid extraction assembly 2 on the installation plate 31 can be constrained. In use, the lower end of the acid extraction pipe 21 is inserted into the acid injection hole 110 and extends into the grid slot 101, at this time, the bottom surface of the installation plate 31 contacts the top surface of the battery 1, and the bottom surface of the installation plate 31 can be in sealed connection with the top surface of the battery 1 through a sealing gasket, so that the air path chamber 311 is located outside the acid injection hole 110, and at this time, the air path chamber 311, the acid injection hole 110 and the grid slot 101 are in communication.

[0058] The side wall of each air path chamber 311 is respectively provided with an exhaust port 3111 and a pressurizing port 3112, the exhaust port 3111 is provided with a first electromagnetic valve 3113 to control the exhaust of gas in the grid slot 101, and the pressurizing port 3112 is provided with a second electromagnetic valve 3114 to control the input of high-pressure gas into the grid slot 101, and the high-pressure gas is used to drive the acid liquid to pressurize and infiltrate the separator 12.

[0059] In this way, when the gas bubbles in the separator 12 are discharged, the second electromagnetic valve 3114 is closed, the first electromagnetic valve 3113 is opened, the air path chamber 311 is communicated with the outside through the exhaust port 3111, under the vibration of the first ultrasonic transducer 23, the gas bubbles in the pores of the separator 12 are separated and float to the liquid surface and enter the grid slot 101, and then enter the air path chamber 311 through the acid injection hole 110, and finally are exhausted through the exhaust port 3111. When the gas bubbles in the separator 12 are discharged, the first electromagnetic valve 3113 is closed, the second electromagnetic valve 3114 is opened, and high-pressure gas is filled into the air path chamber 311 through the pressurizing port 3112, at this time, the negative pressure source connected with the acid extraction pipe 21 is in a closed state, the high-pressure gas enters the grid slot 101 through the air path chamber 311 and the acid injection pipe, the high-pressure gas pressurizes the acid liquid in the grid slot 101, so that the acid liquid infiltrates into the pores of the separator 12, and the separator 12 fully absorbs the acid liquid. When the acid liquid in the separator 12 is saturated, the pressurizing port 3112 is closed, the first electromagnetic valve 3113 is opened, and the acid extraction pipe 21 is sucked through the negative pressure source, so that the excess acid liquid above the separator 12 is removed, the stable amount of acid liquid in the grid slot 101 is maintained, the amount of acid liquid in each grid slot 101 is uniform, the consistency of the amount of acid liquid in each grid slot 101 of the battery is ensured, and the performance of the battery 1 is consistent.

[0060] The acid extraction device disclosed in this application adopts a design that combines the acid extraction component 2 and the installation component 3. In particular, it utilizes ultrasonic vibration to quickly remove air bubbles from the pores of the separator 12 and uses pressure to allow the acid to fully penetrate into the pores of the separator 12, thereby achieving efficient acid extraction operation under non-static conditions. This ensures that the amount of acid in each compartment 101 is uniform, thus significantly improving the production efficiency and performance consistency of the battery 1.

[0061] As some implementation methods, refer to the appendix. Figure 3 , 4 As shown in Figure 7, a first connecting pipe 3115 is provided at the exhaust port 3111, and a first solenoid valve 3113 is provided on the first connecting pipe 3115. An airflow sensor 3116 is also provided on the first connecting pipe 3115 between the first solenoid valve 3113 and the exhaust port 3111. The exhaust port 3111 can be opened or closed through the first solenoid valve 3113. By setting the airflow sensor 3116, during the exhaust process, the airflow sensor 3116 can monitor the exhaust velocity and flow rate in real time to ensure the stability and effectiveness of the gas exhaust process. Specifically, when the airflow sensor 3116 detects that the gas flow rate is very small or that the airflow is basically undetectable, it indicates that the bubbles in the baffle 12 are discharged sufficiently, which can improve the effect of subsequent acid wetting.

[0062] The pressurization port 3112 can be opened or closed by setting the second solenoid valve 3114. The pressure sensor 3118 can monitor the pressure of the pressurized gas in real time during the pressurization process. Through linkage control with the second solenoid valve 3114, the pressurization can be adjusted or closed in time when the pressure reaches the preset value or an abnormality occurs, so as to prevent over-pressurization or under-pressurization.

[0063] By precisely controlling the gas discharge and pressurization process, the full discharge of air bubbles and the full wetting of acid in the separator 12 are ensured, which helps to improve the uniformity of acid in the battery grid 101, thereby improving the overall performance and consistency of the battery.

[0064] In some preferred embodiments, the protective sleeve 22 extends at least partly beyond the bottom surface of the acid extraction tube 21. This allows the protective sleeve 22 to be as close as possible to the partition 12 in the acid solution. When the first ultrasonic transducer 23 is working, the vibration can be transmitted to the partition 12 more effectively, accelerating the discharge of air bubbles in the pores of the partition 12. At the same time, the fact that part of the protective sleeve 22 extends beyond the bottom surface of the acid extraction tube 21 allows the outer periphery of the first ultrasonic transducer 23 to be in full contact with the acid solution. By transmitting vibrational energy into the acid solution, on the one hand, the efficiency of air bubble discharge in the partition 12 can be improved. On the other hand, when the air bubbles rise to the surface and gather, the vibrational energy diffuses in the acid solution, accelerating the rupture of the air bubbles on the surface, allowing the air bubbles to be discharged quickly.

[0065] As some embodiments, the distance between the bottom surface of the protective sleeve 22 and the bottom surface of the acid extraction pipe 21 is 1mm-5mm. With this structure, when the bottom surface of the protective sleeve 22 is close to the baffle 12, there is a certain distance between the bottom surface of the acid extraction pipe 21 and the baffle 12, which avoids the contact between the acid extraction pipe 21 and the baffle 12 during the acid extraction process, so that the adsorbed acid in the baffle 12 is extracted, ensuring the stability of the acid content in the baffle 12. At the same time, after the excess acid above the baffle 12 is extracted, the acid amount in the entire grid groove 101 meets the requirements, and the acid amount in each grid groove 101 of the battery 1 is consistent, thereby improving the performance consistency of the battery 1.

[0066] Due to the slight difference in the length of the baffle 12 in different batches of batteries 1, in order to adjust the depth of the acid extraction pipe 21 in the grid groove 101, avoid the contact between the bottom surface of the protective sleeve 22 and the baffle 12 during the insertion of the acid extraction pipe 21 into the grid groove 101, and cause damage to the baffle 12 during vibration, the embodiment further provides the following scheme. Specifically, the mounting assembly 3 further includes a fixed frame 32 fixedly arranged above the mounting plate 31, the upper end of the acid extraction pipe 21 vertically and movably penetrates above the mounting plate 31 and the fixed frame 32, and the acid extraction pipe 21 and the mounting plate 31 are movably sealed. The fixed frame 32 is provided with a lifting module 33 for driving the acid extraction pipe 21 to move up and down.

[0067] In the above embodiment, the fixed frame 32 and the mounting plate 31 are fixedly connected to form the mounting assembly 3. In actual use, a transfer mechanism or a mechanical hand can be arranged on the production line, which is connected with the fixed frame 32 of the mounting assembly 3 to drive the entire acid extraction device to move. When the height of the acid extraction pipe 21 needs to be adjusted, the acid extraction pipe 21 can be driven to move up and down by the lifting module 33, so as to adjust the position of the acid extraction pipe 21 in the grid groove 101.

[0068] For example, in initial use, the acid extraction pipe 21 is first driven to move up by the lifting module 33, so that the bottom end of the acid extraction pipe 21 is in the gas path chamber 311. When the bottom surface of the mounting plate 31 is in contact and sealed with the top surface of the battery 1, and the gas path chamber 311 and each acid injection hole 110 are in position correspondence, the acid extraction pipe 21 is driven to move down by the lifting module 33, so that the lower end of the acid extraction pipe 21 is inserted into the grid groove 101 and lowered to a suitable position. The position mainly controls the distance between the first ultrasonic transducer 23 and the baffle 12, so as to avoid the direct contact between the first ultrasonic transducer 23 and the baffle 12, which causes the baffle 12 to be broken due to vibration.

[0069] As some embodiments, refer to the accompanying drawings Figure 3 and 7As shown, the acid extraction assembly 2 further comprises a liquid level sensor 24 and a distance measuring sensor 25, both of which are fixedly arranged on the outer wall of the acid extraction pipe 21. The liquid level sensor 24 is used to detect the liquid level at the top of the cell groove 101, and the distance measuring sensor 25 is used to detect the distance between the baffle 12 and the bottom surface of the protective sleeve 22.

[0070] Specifically, the distance measuring sensor 25 is arranged on the outer side of the bottom surface of the acid extraction pipe 21, and the liquid level sensor 24 is arranged on the outer side of the acid extraction pipe 21 above the distance measuring sensor 25. Both of them can be protected by a protective shell made of polytetrafluoroethylene. During the lowering process of the acid extraction pipe 21 in the cell groove 101, the distance measuring sensor 25 detects the distance between the protective sleeve 22 and the baffle 12 in real time. Since the distance between the distance measuring sensor 25 and the bottom surface of the protective sleeve 22 is known, the distance measuring sensor 25 can obtain the distance between the baffle 12 and the bottom surface of the protective sleeve 22 in real time during the lowering process of the acid extraction pipe 21. When the distance between the bottom surface of the protective sleeve 22 and the baffle 12 is less than 5 mm, the lifting module 33 fine-tunes the position of the acid extraction pipe 21 to keep a small distance, such as 1 mm or 2 mm, between the protective sleeve 22 and the baffle 12, thereby ensuring that the ultrasonic energy can effectively act on the baffle 12 and improving the bubble discharge efficiency of the baffle 12.

[0071] When the acid liquid is infiltrated in the baffle 12 after being pressurized, the liquid level in the cell groove 101 can be obtained by the liquid level sensor 24. The liquid level minus 1 mm-2 mm is the excess acid liquid. At this time, under the suction of the acid extraction pipe 21, the excess acid liquid is extracted. When the liquid level is 1-2 mm higher than the bottom surface of the baffle 12, it means that the acid extraction is completed. By reserving 1-2 mm of acid liquid on the top surface of the baffle 12, the phenomenon of insufficient acid liquid on the top surface of the cell groove 101, which leads to the sulfuration and dryness of the electrode plate 13, can be avoided.

[0072] Referring to FIG. 2, the acid extraction assembly 2 further comprises an ultrasonic assembly 4. Figure 8 As shown, the outer peripheral wall of the protective sleeve 22 is uniformly arranged with a plurality of connecting ribs 211, the two ends of each connecting rib 211 are fixedly connected with the outer wall of the protective sleeve 22 and the inner wall of the acid extraction pipe 21.

[0073] Since the diameter of the acid extraction pipe 21 is limited by the diameter of the acid injection hole 110, the volume of the first ultrasonic transducer 23 is limited, and its rated power cannot fully meet the requirement of discharging bubbles from the baffle 12 in a short time. Therefore, a long vibration time is needed to achieve bubble discharge, which will reduce the production efficiency of the storage battery 1 to some extent.

[0074] Therefore, the present embodiment further provides an ultrasonic assembly 4, as shown in FIG. 2. Figure 4 and 7As shown, the ultrasonic assembly 4 is symmetrically provided with two groups, respectively located on both sides of the width direction of the mounting plate 31, the ultrasonic assembly 4 includes a translation module 41 and a plurality of second ultrasonic transducers 42, a plurality of the second ultrasonic transducers 42 are arranged along the length direction of the mounting plate 31, and each second ultrasonic transducer 42 corresponds to the position of the grid slot 101 of the battery 1, the translation module 41 is horizontally fixedly arranged on the fixed frame 32, and is used for driving the second ultrasonic transducer 42 to move horizontally to contact the outer wall of the grid slot 101 of the battery 1.

[0075] By symmetrically arranging the ultrasonic assembly 4 on both sides of the mounting plate 31, it can be ensured that the vibration of the ultrasonic wave is uniformly distributed in the entire grid slot 101 area of the battery 1, the overall vibration effect of the acid extraction device is enhanced, and it can be ensured that each grid slot 101 can fully act on the ultrasonic energy, thereby effectively removing the bubbles in the grid slot 101, improving the absorption efficiency of the acid liquid.

[0076] A plurality of second ultrasonic transducers 42 are arranged along the length direction of the mounting plate 31 and correspond to the positions of the grid slots 101 of the battery 1, ensuring accurate positioning of the ultrasonic transducers. This accurate configuration makes the action range of the ultrasonic wave more accurate, effectively improving the accuracy and efficiency of the vibration, and preventing waste or uneven distribution of ultrasonic energy. By arranging a plurality of second ultrasonic transducers 42 on the outside of the battery 1, in combination with the first ultrasonic transducer 23 at the bottom of the acid extraction pipe 21, the ultrasonic vibration frequency can be greatly improved, cavitation effect can be generated through high-frequency vibration, and bubbles in the separator 12 can be effectively separated and discharged, so that the acid liquid can be more uniformly infiltrated into the separator 12, ensuring that the acid liquid absorption in each grid slot 101 of the separator 12 is consistent, thereby improving the overall performance and consistency of the battery.

[0077] In the above embodiment, the introduction of the translation module 41 enables the second ultrasonic transducer 42 to move in the horizontal direction, ensuring that the transducer can contact the outer wall of the grid slot 101 of the battery 1. When the acid extraction device is installed with the battery 1, the spacing of the second ultrasonic transducers 42 on both sides of the width direction of the fixed frame 32 can be first increased, and then the spacing of the second ultrasonic transducers 42 can be shortened after the acid extraction pipe 21 is smoothly inserted into the grid slot 101, so that the second ultrasonic transducers 42 can fully contact the outside of the grid slot 101 of the battery 1. The second ultrasonic transducers 42 on both sides of the battery 1 respectively apply vibration to the inside of the grid slot 101 in opposite directions, the vibration effect is concentrated in the middle of the separator 12, and the first ultrasonic transducer 23 is used to synchronize the vibration of the middle of the separator 12, so that the vibration can be dispersed to the entire battery grid slot 101, further improving the emptying efficiency of the bubbles in the grid slot 101 of the separator 12, avoiding the phenomenon of uneven acid liquid infiltration caused by uneven bubble emptying of the separator 12, and thereby optimizing the performance consistency of the battery.

[0078] The translation module 41 in this embodiment is a pneumatic cylinder or an oil cylinder.

[0079] As some embodiments, a negative pressure suction pipe 3119 is arranged on the first connecting pipe 3115 between the first electromagnetic valve 3113 and the air flow sensor 3116, for connecting a negative pressure source. By arranging the negative pressure suction pipe 3119, during the ultrasonic exhaust process, the inside of the grid groove 101 can be subjected to negative pressure suction by the negative pressure source, which can accelerate the bubble exhaust efficiency. Meanwhile, under the action of negative pressure, the bubbles released from the baffle 12 can float to the liquid surface and then rapidly break under the action of negative pressure, further accelerating the bubble exhaust and avoiding the bubbles from gathering on the surface of the acid liquid to affect the subsequent pressurized immersion effect and excess acid liquid extraction effect.

[0080] The application also discloses a lead-acid battery acid extraction method, which comprises the following steps:

[0081] S1, insert the acid extraction pipes 21 into the grid grooves 101 of the storage batteries 1 respectively, and place the mounting plate 31 on the top surface of the mounting plate 31 to ensure that the air path chambers 311 are in sealed connection with the acid injection holes 110 of the storage batteries 1, and adjust the depth of the acid extraction pipes 21 in the grid grooves 101.

[0082] In this step, the entire acid extraction device can be driven to move by means of a transfer mechanism or a robot hand on the production line, by being connected with the fixing frame 32 on the mounting assembly 3. The mounting plate 31 is positioned and then falls onto the top surface of the storage battery 1, so that each air path chamber 311 is arranged above the corresponding acid injection hole 110. At this time, a sealed connection is formed between the bottom surface of the mounting plate 31 and the top surface of the storage battery 1 under the pressure action of the robot hand. At this time, the acid extraction pipes 21 are driven to descend by the lifting module 33, the acid extraction pipes 21 pass through the acid injection holes 110 and extend into the grid grooves 101 of the storage batteries 1, the insertion depth of the acid extraction pipes 21 is adjusted by the lifting module 33, so that the bottom surface of the protective sleeve 22 is spaced apart from the baffle 12 by 1-3 mm, and a certain spacing is formed between the bottom surface of the first ultrasonic transducer 23 and the baffle 12. On the one hand, the ultrasonic transducer is prevented from directly acting on the baffle 12 to cause damage to the baffle 12 due to vibration. On the other hand, the ultrasonic transducer is as close as possible to the baffle 12, so that the ultrasonic energy can be precisely controlled to focus on the baffle 12, and the bubble separation efficiency in the pores of the baffle 12 is improved.

[0083] In this step, a dynamic sealing connection is adopted between the acid extraction pipes 21 and the mounting plate 31. The sealing structure can be a bearing seal, a lip seal or a packing seal. In this way, the acid extraction pipes 21 can move up and down relative to the mounting plate 31, and the connection between the acid extraction pipes 21 and the mounting plate 31 is in a sealed state, so that leakage of high-pressure gas from the connection between the acid extraction pipes 21 and the mounting plate 31 during the pressurization process can be avoided.

[0084] S2, close the negative pressure source of the acid extraction pipe 21 and the second electromagnetic valve 3114, isolate the acid extraction pipe 21, and prevent interference bubbles from being discharged. Open the first electromagnetic valve 3113, start the first ultrasonic transducer 23, separate the bubbles in the baffle 12 by using the ultrasonic cavitation effect, and make the bubbles discharge from the exhaust port 3111. The gas flow of the exhaust port 3111 is detected by the airflow sensor 3116 to determine whether the bubble separation is completed.

[0085] The ultrasonic wave can produce micro vibration, promote the separation of bubbles from the pores of the baffle 12, and effectively remove the bubbles in the baffle 12 by this way, so as to facilitate the subsequent acid liquid immersion into the baffle 12 by pressurization, and ensure the acid liquid adsorption saturation rate of the baffle 12. The introduction of the airflow sensor 3116 enables the bubble separation process to be monitored in real time. When the gas flow is lower than the set threshold and stable, it can be accurately judged that the bubble separation is completed, so as to enter the next stage.

[0086] S3, when the airflow sensor 3116 detects that the gas flow is lower than the threshold and stable, it is determined that the bubble separation is completed, the first electromagnetic valve 3113 is closed, the second electromagnetic valve 3114 is opened, and high-pressure gas is input into the grid slot 101 in stages through the pressurization port 3112, and the acid liquid is pressurized and immersed into the baffle 12 by using the high-pressure gas.

[0087] Through pressurization by high-pressure gas, the acid liquid can enter the micro pores of the baffle 12 with higher permeability and diffusivity, so that the internal pores of the baffle 12 can fully absorb the acid liquid, and the acid content in the baffle 12 is stable.

[0088] The staged pressurization matches the pore structure, avoids pressure mutation to damage the baffle 12, ensures that the acid liquid fully infiltrates the micro pores, and improves the battery capacity consistency.

[0089] S4, when the pressure sensor 3118 detects that the pressure value in the grid slot 101 is lower than the threshold and stable, the pressurization action is ended, the first electromagnetic valve 3113 is opened, and the negative pressure source is used to extract the acid liquid through the acid extraction pipe 21. When the liquid level is lowered to a predetermined value, the acid extraction is stopped.

[0090] In this step, the suction amount is feedback controlled by the liquid level sensor 24. When the liquid level is lowered to 1-2 mm above the baffle 12, the acid extraction is stopped to avoid excessive acid extraction, which causes the sulfuration and dryness of the plate 13. The negative pressure source uses a vacuum pump, and the acid extraction rate is dynamically adjusted by a PID algorithm.

[0091] The acid extraction method disclosed in the present application realizes the full penetration and absorption of the acid liquid in the pores of the separator 12 in the cell groove 101 through the ultrasonic driving bubble separation and the high-pressure gas pressurization penetration. Compared with the traditional method of realizing the bubble emptying of the separator 12 and the acid liquid absorption of the separator 12 through the static means, the present application realizes the bubble emptying of the separator 12 through the active method and realizes the absorption of the acid liquid in the separator 12 through the pressurization method, greatly reduces the time consumption caused by the static means after the formation, improves the acid extraction efficiency of the storage battery 1 after the formation, and thus improves the production efficiency of the storage battery 1. At the same time, through the real-time monitoring of the exhaust process, the pressurization process and the acid extraction process, the whole production process can have high-precision operation, and the steps can be automatically adjusted according to the real-time situation, so as to avoid the influence of the errors or improper operations in the manual operation on the battery, and at the same time, the acid liquid content in the separator 12 and the residual acid liquid content in the cell groove 101 after the acid extraction can meet the requirements, the acid amount in each cell groove 101 of the storage battery 1 can be ensured to be consistent, and the performance consistency of the storage battery 1 can be improved.

[0092] As some embodiments, step S2 further comprises: when the gas flow is lower than the preset threshold, increasing the power of the ultrasonic transducer to an enhanced power sufficient to accelerate the bubble separation, and monitoring the gas flow change rate in real time; if the gas flow change rate decreases below a preset safety threshold, closing the first electromagnetic valve 3113.

[0093] When the gas flow is low, increasing the power of the ultrasonic transducer can enhance the ultrasonic energy, thereby accelerating the separation of the bubbles, shortening the separation time, and improving the working efficiency. By monitoring the gas flow change rate in real time, the first electromagnetic valve 3113 can be closed in time when it is detected that the gas flow change rate decreases below the preset safety threshold, so as to avoid damage to the separator 12 caused by the excessively high ultrasonic power.

[0094] In the present embodiment, the power of the first ultrasonic transducer 23 and the second ultrasonic transducer 42 can be increased synchronously.

[0095] Suppose that in actual operation, the preset threshold of the gas flow is 10 L / min, and when the gas flow is detected to be lower than 10 L / min, the power of the ultrasonic transducer will be increased from the normal power (for example, 100 W) to the enhanced power (for example, 150 W). At the same time, the gas flow sensor 3116 will monitor the gas flow change rate in real time. Suppose that the preset safety threshold is 0.5 L / min / s, and when the gas flow change rate decreases below 0.5 L / min / s, the system will automatically close the first electromagnetic valve 3113 and stop the further increase of the ultrasonic power, so as to ensure the safety and effectiveness of the whole process.

[0096] As some preferred embodiments, the step S3 of the staged pressurization comprises:

[0097] In the initial pressurization phase, the gas pressure is raised to a first pressure at a first rate and maintained for a first time period, during which the gas pressure is used to fill the large-sized pores in the separator 12.

[0098] By the pressurization process, the acid liquid is first infiltrated into the larger pores in the separator 12, which are generally more easily absorbed by the acid liquid, so the first pressure and time period are set to ensure that the large pores are completely filled with acid liquid, improving the infiltration efficiency of the acid liquid.

[0099] In actual operation: assuming that in the initial pressurization phase, the first rate is 0.2 bar / min, a relatively slow pressurization rate to avoid the impact caused by too high gas pressure, the first pressure is 1.0 bar, and the first time period is 5 minutes, in this phase, the gas pressure is gradually increased from 0 to 1.0 bar, and maintained for 5 minutes to ensure that the large pores are fully filled.

[0100] In the increasing pressure phase, when the initial pressurization phase ends, if the pressure fluctuation value is detected to exceed a first preset threshold, the gas pressure is raised to a second pressure at a second rate less than the first rate, the second pressure is greater than the first pressure, and maintained for a second time period longer than the first time period, to drive the acid liquid to infiltrate into the medium-sized pores.

[0101] After filling the large pores in the first phase, the increasing pressure phase continues to raise the gas pressure at a lower rate, allowing the acid liquid to infiltrate into the medium-sized pores, thereby increasing the penetration depth of the acid liquid. The increasing pressure helps to finely adjust the pressure, allowing the acid liquid to gradually infiltrate into smaller pores without causing excessive penetration or reverse flow due to too high gas pressure. Monitoring of pressure fluctuations ensures the stability of the pressurization process and avoids potential damage to the battery separator 12 when the gas pressure is too high.

[0102] In actual operation, assuming that in the increasing pressure phase, the second rate is 0.15 bar / min, the pressurization rate is lower than the first phase to avoid too fast increase of the gas pressure. The second pressure is 1.8 bar, which is higher than the first pressure, and is used to drive the acid liquid to infiltrate into the medium-sized pores. The pressurization duration (second time period) is 10 minutes. Pressure fluctuation monitoring: set the first preset threshold to ±0.05 bar, if the pressure fluctuation exceeds this threshold, adjust the rate or end the phase. If the pressure fluctuation exceeds the threshold, the pressurization rate may need to be temporarily adjusted or additional inspection steps may be added. If the pressure fluctuation is maintained below the threshold, the current pressurization rate is maintained until 1.8 bar is reached.

[0103] In the equilibrium phase, when the pressure fluctuation value in the increasing pressure phase is less than or equal to a second preset threshold, the gas pressure is lowered to a third pressure and maintained for a third time period, the third pressure is less than the first pressure, and the pressurization is ended after the gas pressure sensor 3118 data is continuously stable for a fourth time period, to suppress the acid liquid backflow in the micropores.

[0104] In actual operation, it is assumed that during the balancing phase, the third rate is 0.1 bar / min, and the gas pressure is gradually reduced at a slower rate to avoid backflow caused by rapid pressure changes. The target pressure (third pressure) is 0.5 bar (lower than the first pressure to reduce acid backflow in the micro-pores). The duration of the pressurization (third time period) is 5 minutes. Monitoring data: second preset threshold: set to ±0.02 bar, indicating that when the pressure fluctuation is within this range, it can be considered that the pressurization process has reached equilibrium. Fourth time period: if the gas pressure is continuously stable for 5 minutes (i.e., around 0.5 bar), the pressurization phase is completed.

[0105] During this phase, the gas pressure is reduced to avoid excessive pressure on the separator 12, while preventing acid backflow in the micro-pores. By precisely controlling the pressure, it is ensured that the acid is evenly and safely distributed throughout the separator 12. By gradually reducing the gas pressure, it is avoided that the acid flows back in the micro-pores, ensuring that the acid uniformly wets every pore of the separator 12, especially those with smaller sizes. This process helps maintain the stability and consistency of the pressurization process.

[0106] By precisely controlling the rate of increase of the gas pressure and the time, it is possible to achieve acid penetration of different pore sizes at different stages. This phased pressurization effectively ensures the depth and uniformity of acid penetration, while avoiding common backflow phenomena, ensuring that the acid is uniformly penetrated in the separator 12, ensuring that the acid content in the separator 12 in each cell 101 is uniform, and finally by controlling the amount of acid drawn, ensuring that the liquid level in each cell 101 after acid drawing is consistent, it can ensure that the acid amount in all cells 101 of the battery 1 is consistent, improving the performance consistency of the battery 1.

[0107] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A lead-acid battery acid extraction device, characterized in that, include: The acid extraction assembly comprises multiple components. Each assembly includes an acid extraction tube, a protective sleeve, and a first ultrasonic transducer. One end of the acid extraction tube is connected to a negative pressure source, and the other end passes through the acid injection hole of the battery and is inserted into the battery's grid slot. The acid extraction tube and the acid injection hole are clearance-fitted. The protective sleeve is coaxially fixed to the inner side of the bottom of the acid extraction tube, and an annular channel for acid flow is formed between the protective sleeve and the acid extraction tube. The first ultrasonic transducer is disposed inside the protective sleeve and is used to transmit vibrations into the grid slot to separate air bubbles in the pores of the separator. The mounting assembly includes a mounting plate. Multiple independent gas passage chambers are spaced apart along the length of the bottom surface of the mounting plate. Each gas passage chamber is sealed and connected to the acid injection port of the battery. An acid extraction tube, with its end away from the protective sleeve, passes through the gas passage chamber and extends to the top surface of the mounting plate. The gas passage chambers are connected to the corresponding battery grid cells via the acid injection ports. Each gas passage chamber has an exhaust port and a pressurization port on its side wall. The exhaust port is equipped with a first solenoid valve to control the discharge of gas from the grid cell, and the pressurization port is equipped with a second solenoid valve to control the input of high-pressure gas into the grid cell. The high-pressure gas is used to drive acid liquid to pressurize and wet the separator.

2. The lead-acid battery acid extraction device as described in claim 1, characterized in that: A first connecting pipe is provided at the exhaust port, a first solenoid valve is provided on the first connecting pipe, and an airflow sensor is also provided on the first connecting pipe between the first solenoid valve and the exhaust port. A second connecting pipe is provided at the pressurization port, a second solenoid valve is provided on the second connecting pipe, and a pressure sensor is also provided on the second connecting pipe between the second solenoid valve and the pressurization port.

3. The lead-acid battery acid extraction device as described in claim 1, characterized in that: At least a portion of the protective sleeve extends beyond the bottom surface of the acid extraction tube. The distance between the bottom surface of the protective sleeve and the bottom surface of the acid extraction tube is 1mm to 5mm. Several connecting ribs are evenly arranged on the outer peripheral wall of the protective sleeve, and the two ends of the connecting ribs are fixedly connected to the outer wall of the protective sleeve and the inner wall of the acid extraction tube, respectively.

4. The lead-acid battery acid extraction device as described in claim 3, characterized in that: The mounting assembly also includes a fixing frame, which is fixedly mounted above the mounting plate. The upper end of the acid extraction tube moves vertically through the mounting plate and the fixing frame. The acid extraction tube and the mounting plate are dynamically sealed together. The fixing frame is equipped with a lifting module for driving the acid extraction tube to move up and down.

5. The lead-acid battery acid extraction device as described in claim 4, characterized in that: The acid extraction assembly also includes a liquid level sensor and a distance sensor. Both the liquid level sensor and the distance sensor are fixedly installed on the outer wall of the acid extraction tube. The liquid level sensor is used to detect the liquid level at the top of the battery grid, and the distance sensor is used to detect the distance from the separator to the bottom of the protective sleeve.

6. The lead-acid battery acid extraction device as described in claim 4, characterized in that: It also includes an ultrasonic component, which is symmetrically arranged in two sets, located on both sides of the width direction of the mounting plate. The ultrasonic component includes a translation module and multiple second ultrasonic transducers. The multiple second ultrasonic transducers are arranged at intervals along the length direction of the mounting plate, and each second ultrasonic transducer corresponds to the position of the battery grid. The translation module is horizontally fixed on the mounting frame and is used to drive the second ultrasonic transducers to move horizontally to contact the outer wall of the battery grid.

7. The lead-acid battery acid extraction device as described in claim 2, characterized in that: A negative pressure suction tube is also provided on the first connecting pipe between the first solenoid valve and the airflow sensor for connecting to a negative pressure source.

8. A method for removing acid from a lead-acid battery, comprising using the lead-acid battery acid removal device as described in any one of claims 2 to 7, characterized in that, The steps include the following: S1. Insert the acid extraction tubes into each cell of the battery and place the mounting plate on top of the mounting plate to ensure a sealed connection between the gas passage chamber and the battery's acid injection hole. Adjust the depth of the acid extraction tubes inside the cell. S2. Close the negative pressure source of the acid extraction tube and the second solenoid valve, open the first solenoid valve, start the first ultrasonic transducer, use ultrasonic energy to drive the bubbles in the partition to separate and be discharged from the exhaust port, and use the airflow sensor to detect the gas flow rate at the exhaust port to determine whether the bubble separation is complete. S3. When the airflow sensor detects that the gas flow rate is lower than the threshold and remains stable, it determines that the bubble separation is complete, closes the first solenoid valve, opens the second solenoid valve, and inputs high-pressure gas into the grid in stages through the pressurization port, using the high-pressure gas to drive the acid liquid to pressurize and wet the partition. S4. When the pressure sensor detects that the pressure value in the grid is lower than the threshold and remains stable, the pressurization action ends, the first solenoid valve is opened, the negative pressure source is opened to extract acid through the acid extraction tube, and the acid extraction stops when the liquid level drops to the predetermined value.

9. The lead-acid battery acid extraction method as described in claim 8, characterized in that, Step S2 further includes: when the gas flow rate is lower than a preset threshold, increasing the power of the ultrasonic transducer to an enhanced power sufficient to accelerate bubble separation, and monitoring the airflow change rate in real time; if the airflow change rate drops below a preset safety threshold, then closing the first solenoid valve.

10. The lead-acid battery acid extraction method as described in claim 8, characterized in that, The staged pressurization in step S3 includes: During the initial pressurization phase, the air pressure is increased to a first pressure at a first rate and maintained for a first time period to fill the large-sized pores in the partition. During the incremental pressurization phase, if the pressure fluctuation value exceeds the first preset threshold when the initial pressurization phase ends, the gas pressure is increased to the second pressure at a second rate less than the first rate. The second pressure is greater than the first pressure and is maintained for a second time period longer than the first time period, driving the acid to penetrate into medium-sized pores. During the balancing phase, when the pressure fluctuation value during the incremental pressurization phase is less than or equal to the second preset threshold, the air pressure is reduced to the third pressure and maintained for a third time period. The third pressure is less than the first pressure. Pressurization ends after the air pressure sensor data continuously and stably reaches the fourth time period, in order to suppress the backflow of microporous acid.

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