Recovery system of formation electrolyte in lead-acid battery

Abstract

The utility model discloses a lead -acid battery inner formation electrolyte recovery system relates to battery technical field. The utility model discloses a lead -acid battery inner formation electrolyte recovery system includes straw, sediment tank, filter bucket and supporting pump body, and the bottom end of straw is equipped with buffer contact plate, and the lateral wall is provided with side suction opening, and the supporting locating nut is equipped with built -in check valve, and filter bucket is equipped with filter screen. After electrolyte draws through the side suction opening of straw, deposits and grades in the sediment tank and filters in the filter bucket, recycling is used again. The utility model can control the depth of drawing liquid accurately, avoids battery separator breakage, and the waste liquid recycling is used, improves battery consistency, and reduces production and environmental protection cost.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a lead-acid battery internal electrolyte recovery system. Background Technology

[0002] Stationary valve-regulated lead-acid batteries are generally manufactured using an internal formation process. To fully activate the active materials on the plates and ensure formation efficiency and final battery performance, an excess of sulfuric acid electrolyte needs to be added to the battery during the production stage. After the formation process is completed, the excess free electrolyte inside the battery must be removed to maintain a standard lean electrolyte state inside the battery. This ensures unobstructed oxygen recombination circulation and meets the requirements for maintenance-free use.

[0003] The current industry practice involves using a simple suction tube paired with a diaphragm pump or vacuum pump to create a basic liquid extraction device. The suction tube is inserted into the battery's electrolyte filling port, and excess electrolyte is extracted using negative pressure. This traditional method has the following drawbacks in actual production: (1) The internal structure of the maintenance-free fixed valve-regulated lead-acid battery is made of ultra-fine glass fiber separator, which is soft, resistant to compression, and has weak suction resistance. The bottom of the traditional suction tube faces the separator directly. When suction is performed under negative pressure, the bottom of the suction tube directly squeezes and adsorbs the separator, which can easily cause the separator to tear and the fiber to fall off. The fallen glass fiber and lead paste from the plates will enter the suction tube and delivery pipeline with the electrolyte, frequently causing pipeline blockage. It is necessary to stop the machine for disassembly and cleaning, which greatly reduces the efficiency of continuous operation of the production line. Long-term suction of damaged separators can also cause micro-short circuits inside the battery, directly producing batches of defective products and increasing production loss costs.

[0004] (2) The extracted sulfuric acid electrolyte contains a large amount of impurities such as lead paste, glass fiber, and electrode fragments, and cannot be directly reused. The industry's conventional treatment method is to add sodium hydroxide for acid-base neutralization, and the neutralized wastewater is sent to a sewage treatment plant for discharge after meeting standards. This model, on the one hand, continuously consumes a large amount of sodium hydroxide and hydroelectric power, increasing the cost of battery manufacturing; on the other hand, the direct disposal of electrolyte results in the waste of raw material resources, and the wastewater treatment generates a large amount of saline wastewater, increasing the environmental protection and maintenance pressure on enterprises, which is not in line with the industrial development trend of green circular production.

[0005] In summary, existing simple electrolyte extraction devices have multiple shortcomings, such as easily damaging battery separators and the inability to recycle and reuse waste liquid. There is an urgent need for an integrated electrolyte recycling system that can avoid separator damage and allow for electrolyte recycling and reuse. Utility Model Content

[0006] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide an internal electrolyte recovery system for lead-acid batteries, which effectively avoids the problem of poor battery float charging consistency caused by uneven electrolyte treatment, solves the hidden danger of separator damage during electrolyte treatment, facilitates precise operation by workers, and improves labor efficiency.

[0007] The technical solution of this utility model is as follows: The lead-acid battery internal electrolyte recovery system includes a suction tube inserted into the battery's electrolyte inlet and connected to a sedimentation tank via a first pipe. A pump is installed on the first pipe. The sedimentation tank is connected to a filter tank via a second pipe, which contains a filter screen. A second pump is installed on the second pipe. A buffer contact plate is installed at the end of the suction tube inserted into the battery's electrolyte inlet, blocking this end of the suction tube to buffer the contact force with the battery separator and prevent the separator from breaking under stress. A side suction opening is provided on the side wall of the suction tube near the buffer contact plate, which can draw in electrolyte from all directions around the suction tube, improving the electrolyte treatment efficiency and avoiding the phenomenon of separator damage or suction tube blockage caused by drawing electrolyte from the bottom of the suction tube. A positioning nut is threaded onto the side wall of the suction tube. The position of the positioning nut can be adjusted according to the height of the air chamber inside different battery models to determine the electrolyte treatment height for different batteries, ensuring consistency in electrolyte treatment.

[0008] Preferably, the pipette is equipped with a one-way valve, which can effectively prevent electrolyte backflow when electrolyte treatment stops, thereby improving the treatment accuracy.

[0009] Preferably, the side suction opening is arc-shaped and circumferentially spaced on the side wall of the straw.

[0010] Preferably, the straw is made of a light-transmitting resin material.

[0011] Preferably, the inlet of the filter barrel is located at the top and the outlet is located at the bottom, and three layers of filter screens are arranged inside the filter barrel from top to bottom, with the pore size of the three layers of filter screens decreasing from top to bottom.

[0012] Preferably, a scale line is provided on the side wall of the straw at the connection point with the positioning nut.

[0013] Compared with the prior art, this utility model has the following advantages: 1. The positioning nut on the outer wall of the straw in this utility model allows for precise adjustment of the straw insertion depth according to the height of the gas chamber of different battery models, ensuring a uniform amount of residual electrolyte in a single batch of batteries and eliminating the problem of inconsistent suction depth caused by manual operation based on experience. Combined with the one-way valve inside the straw, electrolyte backflow is blocked after suction stops, preventing fluctuations in the electrolyte level inside the battery and fundamentally solving the problems of float charge voltage dispersion and individual cell lag caused by differences in residual electrolyte. Simultaneously, the side suction opening on the side wall of the straw provides circumferential suction, evenly drawing free electrolyte from around the battery, eliminating the risk of localized electrolyte accumulation, and significantly improving the overall performance consistency of the finished battery.

[0014] 2. This utility model features a buffer contact plate at the bottom of the straw, completely sealing the liquid suction channel at the bottom of the straw. Liquid is suctioned using negative pressure from the side suction opening on the side wall. The buffer contact plate increases the contact area with the battery separator and disperses the contact pressure, preventing the straw end from directly squeezing and adsorbing the soft separator, thus preventing separator tearing and fiber shedding from the source. This significantly reduces the amount of glass fiber and lead paste impurities entering the delivery pipeline, lowering the frequency of pipeline blockages, reducing production line downtime for cleaning, avoiding micro-short circuit defects inside the battery caused by separator damage, and reducing production material losses and scrap costs.

[0015] 3. The straw of this utility model is made of light-transmitting resin material, allowing operators to directly observe the flow of electrolyte inside the straw during operation and quickly determine the completion point of liquid extraction for a single battery; the scale lines on the tube wall are equipped with an adjustable positioning nut, which allows for quick liquid extraction height calibration when changing batteries of different specifications, eliminating the need for repeated manual comparison and calculation, and making the operation simple and easy to learn.

[0016] 4. This utility model's lead-acid battery internal formation electrolyte recovery system integrates a sedimentation tank for sedimentation and a filtration tank for filtration: the electrolyte is first sent to the sedimentation tank for settling to remove large particles of lead paste and active material impurities; then it enters the filtration tank and is filtered layer by layer from top to bottom through a filter screen with progressively smaller pore sizes to intercept fine fibers and suspended impurities. The purified electrolyte, after density adjustment, can be reused in the acid leaching and electrolyte preparation processes, realizing the resource recycling of waste electrolyte. This eliminates the need for the large amount of sodium hydroxide neutralization treatment steps in traditional processes, significantly reducing sodium hydroxide and water / electricity consumption, lowering the maintenance load of wastewater treatment plants, reducing saline wastewater discharge, alleviating the environmental pressure on enterprises, and aligning with the green circular manufacturing development requirements of the battery industry. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the internal electrolyte recovery system for lead-acid batteries according to this utility model.

[0018] Figure 2 This is a schematic diagram of the structure of the straw of this utility model.

[0019] In the diagram, 1. straw; 101. side suction opening; 102. scale line; 2. buffer contact plate; 3. positioning nut; 4. one-way valve; 5. battery; 6. pipe one; 7. sedimentation tank; 8. pump one; 9. pipe two; 10. filter barrel; 11. filter screen; 12. pump two. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model.

[0021] Example 1 like Figure 1 As shown, this embodiment provides a lead-acid battery internal formation electrolyte recovery system, including a pipette 1, which is inserted into the electrolyte inlet of the battery 5 and connected to a sedimentation tank 7 via a pipe 6. A pump 8, which is a diaphragm pump, is installed on the pipe 6. A filter tank 10 is connected to the sedimentation tank 7 via a pipe 9, and a pump 12, which is a circulation pump, is installed on the pipe 9. The inlet of the filter tank 10 is located at the top, and the outlet is located at the bottom. Three layers of filter screens 11 are arranged inside the filter tank 10 from top to bottom, and the pore size of the three layers of filter screens 11 decreases from top to bottom. The electrolyte in the battery 5 enters the sedimentation tank 7 through the electrolyte inlet via the pipette 1 for static sedimentation to remove large particulate impurities such as active substances in the electrolyte. Then it enters the filter tank 10 and is filtered through the three layers of filter screens 11 to remove small particulate impurities such as fibers and floating matter in the electrolyte. Finally, the filtered electrolyte is recycled to the acid leaching and electrolyte preparation processes.

[0022] In this embodiment, the straw 1 is made of AS resin, which is smooth and beautiful, impact-resistant and corrosion-resistant, and facilitates observation of the electrolyte treatment status during operation.

[0023] like Figure 2 As shown, a circular buffer contact plate 2 is provided at the end of the straw 1 that is inserted into the liquid filling port of the battery 5. The buffer contact plate 2 blocks this end of the straw 1. The buffer contact plate 2 can increase the contact area between the straw 1 and the separator of the battery 5, buffer the contact force with the separator, and prevent the separator from being damaged by the force.

[0024] like Figure 2 As shown, a side suction opening 101 is provided on the side wall of the straw 1 near the buffer contact plate 2. The side suction opening 101 is arc-shaped and circumferentially spaced on the side wall of the straw 1. The side suction opening 101 can draw in electrolyte from all directions around the straw 1, improving the electrolyte processing efficiency. Compared with the traditional processing method, this avoids the phenomenon of the partition being damaged or the straw 1 being blocked due to the direct intake of electrolyte from the bottom of the straw 1.

[0025] like Figure 2 As shown, a positioning nut 3 is threaded onto the side wall of the straw 1. The bottom diameter of the positioning nut 3 matches the liquid injection port of the fixed valve-regulated battery 5 cap. A scale line 102 is provided on the side wall of the straw 1 where it connects to the positioning nut 3. Since the air chamber height inside different battery models 5 is different, the electrolyte treatment height of different batteries 5 is positioned by adjusting the position of the positioning nut 3 on the straw 1, thus ensuring the consistency of electrolyte treatment.

[0026] Working principle: Taking GF-1500 battery 5 as an example, after the formation process is completed, the electrolyte inside battery 5 is treated as follows: S1: The internal air chamber height of GF-1500 battery 5 is 85mm. Adjust the positioning nut 3 to a height of 85mm, insert the straw 1 into the battery 5, and lock the positioning nut 3 into the liquid injection port to complete the positioning of the electrolyte treatment height of battery 5.

[0027] S2: Start the diaphragm pump to process the electrolyte. Observe the flow of electrolyte in the pipette 1. If no electrolyte is drawn out, proceed to the next battery 5.

[0028] S3: The electrolyte drawn from battery 5 enters sedimentation tank 7 through pipe 1 and pipe 6 and is treated for sedimentation for 48 hours.

[0029] S4: The precipitated electrolyte enters the filter tank 10 through pipeline 29 under the action of the circulation pump for filtration. The treated electrolyte is then recycled to the acid leaching and electrolyte preparation processes after the density is adjusted.

[0030] When processing electrolyte for other battery models 5, the position of the positioning nut 3 can be adjusted according to the height of the air chamber of battery 5. For example, if the height of the air chamber of GF-2500 battery 5 is 100mm, the positioning nut 3 can be adjusted to the corresponding 100mm position on the suction tube 1.

[0031] Example 2 Based on Example 1, such as Figure 2 As shown, a one-way valve 4 is installed inside the suction tube 1. After the diaphragm pump stops and stops sucking liquid, the one-way valve 4 automatically closes to seal the pipeline, preventing the electrolyte in the sedimentation tank 7 and pipeline 6 from flowing back into the battery 5, further improving the accuracy of electrolyte level control and ensuring the uniform performance of batch batteries 5.

Claims

1. A lead-acid battery internal electrolyte recovery system, characterized in that, Includes a straw (1), which is inserted into the liquid inlet of the battery (5) and connected to a sedimentation tank (7) via a first pipe (6). A first pump (8) is installed on the first pipe (6). The sedimentation tank (7) is connected to a filter bucket (10) via a second pipe (9). A filter screen (11) is installed inside the filter bucket (10). A second pump (12) is installed on the second pipe (9). A buffer contact plate (2) is provided at the end of the straw (1) inserted into the liquid inlet of the battery (5). The buffer contact plate (2) blocks the end of the straw (1). A side suction opening (101) is provided on the side wall of the straw (1) near the buffer contact plate (2), and a positioning nut (3) is threaded onto the side wall of the straw (1).

2. The lead-acid battery internal electrolyte recovery system as described in claim 1, characterized in that, The straw (1) is equipped with a one-way valve (4).

3. The lead-acid battery internal electrolyte recovery system as described in claim 1, characterized in that, The side suction opening (101) is arc-shaped and circumferentially spaced on the side wall of the straw (1).

4. The lead-acid battery internal electrolyte recovery system as described in claim 1, characterized in that, The straw (1) is made of a light-transmitting resin material.

5. The lead-acid battery internal electrolyte recovery system as described in claim 1, characterized in that, The inlet of the filter barrel (10) is located at the top and the outlet is located at the bottom. The filter barrel (10) is provided with three layers of filter screens (11) from top to bottom, and the pore size of the three layers of filter screens (11) decreases from top to bottom.

6. The lead-acid battery internal electrolyte recovery system as described in claim 1, characterized in that, The straw (1) has a scale line (102) at the connection point between its side wall and the positioning nut (3).

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