A system and method for treating battery electrolyte impurities

Abstract

The application provides a battery electrolyte impurity treatment system and method, and belongs to the technical field of batteries, comprising a recovery tank, a filtering mechanism, a temperature control system and an electrophoresis mechanism. The upper part of the side wall of the recovery tank is provided with a liquid inlet pipe, the bottom of the recovery tank is provided with a sedimentation tank, and the sedimentation tank is provided with a discharge pipe. The filtering mechanism comprises a filter box and a filter layer, the filter box is connected with the liquid inlet pipe, and the filter layer is arranged in the filter box. The temperature control system is arranged in the recovery tank and is used for improving the temperature of the electrolyte in the recovery tank. The electrophoresis mechanism comprises a positive electrode row and a negative electrode row, the positive electrode row and the negative electrode row are arranged at the top of the recovery tank, and the positive electrode row and the negative electrode row are connected with the power supply through power supply lines. The battery electrolyte impurity treatment system provided by the application can remove large-particle suspended matter, non-dissolved substances and metal ion impurities in the electrolyte, can improve the solubility of the organic matter in the negative electrode additive and the separator in the electrolyte, and can ensure the performance index of the battery.

Description

Technical Field

[0001] This invention belongs to the field of storage battery technology, and more specifically, relates to a storage battery electrolyte impurity treatment system and method. Background Technology

[0002] As automakers increase their demands for battery quality stability, battery manufacturers are strengthening process optimization and control related to battery voltage consistency. Voltage, a key quality indicator for batteries, is primarily affected by electrolyte specific gravity; differences in specific gravity after battery formation lead to significant voltage fluctuations. Process optimization involves removing the electrolyte after formation and then adding a specific gravity of recycled acid to eliminate specific gravity differences in the finished batteries, ensuring voltage consistency.

[0003] The battery reverse acid production process currently used both domestically and internationally has drawbacks: large particles of suspended matter, undissolved substances, and metal ion impurities are easily mixed into the electrolyte. In addition, the organic matter in the negative electrode additives and separators has low solubility in the electrolyte, which seriously affects the battery's performance indicators. Summary of the Invention

[0004] The purpose of this invention is to provide a battery electrolyte impurity treatment system, which aims to solve the problems of large particulate suspended matter, undissolved substances and metal ion impurities mixed in the electrolyte being difficult to remove, and the low solubility of organic matter in negative electrode additives and separators in the electrolyte, which seriously affects the performance indicators of the battery.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a battery electrolyte impurity treatment system, comprising:

[0006] A recycling tank is provided with an inlet pipe on the upper part of its side wall, a sedimentation tank is provided at the bottom of the recycling tank, and a discharge pipe is provided at the bottom of the sedimentation tank.

[0007] The filtration mechanism includes a filter box and a filter layer. The filter box is connected to the inlet end of the inlet pipe, and the filter layer is disposed inside the filter box for filtering large particulate suspensions and undissolved substances in the electrolyte.

[0008] A temperature control system is installed in the recovery tank to increase the temperature of the electrolyte in the recovery tank, thereby improving the solubility of the electrolyte in the negative electrode additives and organic matter.

[0009] An electrophoresis mechanism is provided, comprising a positive electrode array and a negative electrode array, which are respectively disposed at the top of the recovery tank. The positive electrode array and the negative electrode array are respectively connected to a power supply via power lines to form an electrophoretic effect on the electrolyte to remove metal ion impurities.

[0010] One possible implementation also includes:

[0011] A liquid collection pipe is installed on the lower part of the side wall of the recovery tank;

[0012] A liquid sampling analyzer is connected to the liquid sampling tube and is used to detect the content of metal ion impurities in the electrolyte.

[0013] In one possible implementation, the sedimentation tank slopes upward from the center outwards, and the discharge pipe is installed longitudinally in the center of the sedimentation tank.

[0014] In one possible implementation, there are multiple positive electrode rows and multiple negative electrode rows, which are arranged side by side on top of the recycling tank;

[0015] The two ends of the positive electrode array are respectively connected to the opposite inner walls of the recycling tank, and the same end of the plurality of positive electrode arrays is provided with a positive electrode mounting and positioning plate connected to the power line;

[0016] The two ends of the negative electrode array are respectively connected to the opposite inner walls of the recycling pool, and the same end of the plurality of negative electrode arrays is provided with a negative electrode mounting and positioning plate for connecting the power line.

[0017] In one possible implementation, the positive electrode array includes:

[0018] Positive electrode mounting beam, with its two ends respectively connected to the opposite inner walls of the recycling pool, and the same end of multiple positive electrode mounting beams connected to the positive electrode mounting positioning plate;

[0019] Multiple positive electrode plates are arranged sequentially along the length direction of the positive electrode mounting beam, and the end faces of the positive electrode plates are parallel to the length direction of the positive electrode mounting beam.

[0020] The negative electrode array includes:

[0021] A negative electrode mounting beam, the two ends of which are respectively connected to the opposite inner walls of the recycling pool, and the same end of multiple negative electrode mounting beams is connected to the negative electrode mounting positioning plate;

[0022] Multiple negative electrode plates are arranged sequentially along the length direction of the negative electrode mounting beam, and the end faces of the negative electrode plates are parallel to the length direction of the negative electrode mounting beam.

[0023] In one possible implementation, the positive electrode mounting positioning plate and the negative electrode mounting positioning plate are respectively disposed on opposite side walls of the recycling tank. Positive electrode observation window and negative electrode observation window are also respectively disposed on opposite side walls of the recycling tank. The positive electrode observation window is disposed opposite to the positive electrode mounting positioning plate and located between two adjacent positive electrode rows, and the negative electrode observation window is disposed opposite to the negative electrode mounting positioning plate and located between two adjacent negative electrode rows.

[0024] One possible implementation also includes:

[0025] A cleaning cover is provided at the top of the recycling tank. A water washing injection pipe is provided on the top of the cleaning cover, and a power pump is provided on the water washing injection pipe.

[0026] A diversion plate is located at the bottom of the cleaning cover, and multiple diversion holes are evenly distributed on the diversion plate.

[0027] In one possible implementation, the cross-sectional area of ​​the inner cavity of the cleaning cover gradually decreases from top to bottom.

[0028] The beneficial effects of the battery electrolyte impurity treatment system provided by this invention are as follows: Compared with the prior art, the filter box is equipped with a filter layer inside, the filter box is connected to the inlet pipe at the top of the recovery tank, the recovery tank is equipped with a temperature control system, a sedimentation tank is located at the bottom of the recovery tank, a discharge pipe is located at the bottom of the sedimentation tank, and a positive electrode array and a negative electrode array are installed at the top of the recovery tank. When using the battery electrolyte impurity treatment system provided by this invention, the electrolyte first enters the filter box, where large particulate suspended matter and undissolved substances mixed in the electrolyte are blocked by the filter layer, achieving preliminary filtration of the electrolyte. The electrolyte after preliminary filtration enters the recovery tank, and the temperature control system is turned on to bring the electrolyte in the recovery tank to a predetermined temperature, improving the solubility of the electrolyte for negative electrode additives and organic matter. When the positive electrode array and the negative electrode array are energized, an electrophoretic effect is formed in the electrolyte, and metal ion impurities in the electrolytic cell collect on the positive electrode array and the negative electrode array.

[0029] The present invention also provides a method for treating impurities in battery electrolyte, using the aforementioned battery electrolyte impurity treatment system, comprising the following steps:

[0030] S1: The electrolyte is injected into the filter box. After the large particulate suspended matter and undissolved substances in the electrolyte are removed by the filter layer, the electrolyte flows into the recovery tank through the inlet pipe.

[0031] S2: After the electrolyte fills the recovery tank, turn on the temperature control system to raise the electrolyte temperature to 40℃-50℃ and keep it constant for 30 minutes. Then, open the discharge pipe to initially discharge the impurities that have settled in the sedimentation tank and then close the discharge pipe.

[0032] S3: When the positive and negative electrode rows are energized, the positive and negative electrode rows form an electrophoretic effect, and metal ion impurities in the electrolyte adhere to the positive and negative electrode rows.

[0033] In one possible implementation, in step S3, the liquid analyzer is connected to the recovery tank through a liquid sampling pipe. The liquid analyzer samples and analyzes the electrolyte in the recovery tank at 2-hour intervals, calculates the content of metal ion impurities in the electrolyte, and compares the difference between two adjacent contents to determine the operating status of the positive electrode and the negative electrode.

[0034] The beneficial effects of the battery electrolyte impurity treatment method provided by the present invention are as follows: compared with the prior art, since the above-mentioned battery electrolyte impurity treatment system is used, it has the same beneficial effects as the battery electrolyte impurity treatment system, which will not be repeated here. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of a battery electrolyte impurity treatment system provided in an embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of the structure of a positive electrode array or a negative electrode array provided in an embodiment of the present invention;

[0038] Figure 3 This is a schematic diagram of the structure of the cleaning cover provided in an embodiment of the present invention;

[0039] Figure 4 This is a schematic diagram of the structure of the flow divider provided in an embodiment of the present invention;

[0040] Figure 5 This is a process flow diagram of a battery electrolyte impurity treatment method provided in an embodiment of the present invention.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1. Recovery tank; 2. Inlet pipe; 3. Sedimentation tank; 4. Discharge pipe; 5. Filter box; 6. Filter layer; 7. Temperature control system; 8. Positive electrode array; 9. Negative electrode array; 10. Power cord; 11. Liquid sampling pipe; 12. Liquid sampling analyzer; 13. Positive electrode mounting positioning plate; 14. Negative electrode mounting positioning plate; 15. Positive electrode mounting beam; 16. Positive electrode plate; 17. Negative electrode mounting beam; 18. Negative electrode plate; 19. Positive electrode observation window; 20. Negative electrode observation window; 21. Cleaning cover; 22. Water washing injection pipe; 23. Power pump; 24. Diverter plate; 25. Diverter hole. Detailed Implementation

[0043] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0044] Please see Figure 1 The present invention will now describe a battery electrolyte impurity treatment system. The battery electrolyte impurity treatment system includes a recovery tank 1, a filtration mechanism, a temperature control system 7, and an electrophoresis mechanism.

[0045] The upper side wall of the recovery tank 1 is provided with an inlet pipe 2, and the bottom of the recovery tank 1 is provided with a sedimentation tank 3, and the bottom of the sedimentation tank 3 is provided with a discharge pipe 4. The filtration mechanism includes a filter box 5 and a filter layer 6. The filter box 5 is connected to the inlet end of the inlet pipe 2, and the filter layer 6 is located inside the filter box 5 to filter large particulate suspensions and undissolved substances in the electrolyte. The temperature control system 7 is located in the recovery tank 1 to raise the temperature of the electrolyte in the recovery tank 1, so as to improve the solubility of the electrolyte for negative electrode additives and organic matter. The electrophoresis mechanism includes a positive electrode row 8 and a negative electrode row 9. The positive electrode row 8 and the negative electrode row 9 are respectively located at the top of the recovery tank 1. The positive electrode row 8 and the negative electrode row 9 are respectively connected to the power supply through the power line 10 to form an electrophoretic effect on the electrolyte to remove metal ion impurities.

[0046] This invention provides a battery electrolyte impurity treatment system. Compared with existing technologies, the filter box 5 has a filter layer 6 inside. The filter box 5 is connected to the inlet pipe 2 at the top of the recovery tank 1. The recovery tank 1 is equipped with a temperature control system 7. A sedimentation tank 3 is located at the bottom of the recovery tank 1, and a discharge pipe 4 is located at the bottom of the sedimentation tank 3. A positive electrode array 8 and a negative electrode array 9 are installed at the top of the recovery tank 1. When using the battery electrolyte impurity treatment system provided by this invention, the electrolyte first enters the filter box 5. Large particulate suspensions and undissolved substances mixed in the electrolyte are blocked by the filter layer 6, achieving preliminary filtration of the electrolyte. The electrolyte after preliminary filtration enters the recovery tank 1. The temperature control system 7 is turned on to make the electrolyte in the recovery tank 1 reach a predetermined temperature, improving the solubility of the electrolyte for negative electrode additives and organic matter. When the positive electrode array 8 and the negative electrode array 9 are energized, an electrophoretic effect is formed in the electrolyte, and metal ion impurities in the electrolytic cell are collected on the positive electrode array 8 and the negative electrode array 9.

[0047] The inlet pipe 2 is connected to the bottom of the filter box 5. The filter layer 6 is located in the lower part of the inner cavity of the filter box 5. The electrolyte passes through the filter pores of the filter layer 6, blocking large suspended particles and undissolved substances above the filter layer 6. After preliminary filtration, the electrolyte enters the recovery tank 1. The temperature control system 7 is a resistance heating system, with the resistance wire embedded in the side wall of the recovery tank 1. A control input terminal is embedded in the outer wall of the recovery tank 1.

[0048] In some embodiments, please refer to Figure 1 A battery electrolyte impurity treatment system also includes a liquid sampling pipe 11 and a liquid sampling analyzer 12.

[0049] The liquid sampling tube 11 is located on the lower side wall of the recovery tank 1; the liquid sampling analyzer 12 is connected to the liquid sampling tube 11 and is used to detect the content of metal ion impurities in the electrolyte.

[0050] The liquid sampling tube 11 is horizontally connected to the lower part of the side wall of the recovery tank 1. The end of the liquid sampling tube 11 away from the recovery tank 1 is connected to the liquid sampling analyzer 12. The liquid sampling analyzer 12 can analyze the content of metal ions in the electrolyte to monitor the electrophoresis effect of the electrolyte in the recovery tank 1 in real time and determine whether the electrophoresis mechanism is operating normally.

[0051] The sedimentation tank 3 slopes upward from the center to the surrounding areas, forming a cone-shaped sedimentation tank 3. The discharge pipe 4 is installed longitudinally in the center of the sedimentation tank 3, that is, at the lowest point of the sedimentation tank 3. Large particulate suspended matter and undissolved substances remaining in the electrolyte will settle and collect at the bottom of the cone-shaped sedimentation tank 3. The discharge pipe 4 can quickly discharge the above-mentioned impurities to further remove the residual particulate matter in the electrolyte.

[0052] In some embodiments, please refer to Figure 1There are multiple positive electrode rows 8 and multiple negative electrode rows 9, which are arranged side by side on the top of the recycling tank 1. The two ends of the positive electrode rows 8 are respectively connected to the opposite inner walls of the recycling tank 1, and the same end of the multiple positive electrode rows 8 is provided with a positive electrode mounting and positioning plate 13 for connecting the power cord 10. The two ends of the negative electrode rows 9 are respectively connected to the opposite inner walls of the recycling tank 1, and the same end of the multiple negative electrode rows 9 is provided with a negative electrode mounting and positioning plate 14 for connecting the power cord 10.

[0053] In this embodiment, the same end of the multiple rows of positive electrode rows 8 is fixed to the side wall of the recycling tank 1 by the positive electrode mounting and positioning plate 13, and the same end of the multiple rows of negative electrode rows 9 is fixed to the side wall of the recycling tank 1 by the negative electrode mounting and positioning plate 14.

[0054] Multiple rows of positive electrode arrays 8 are spaced apart and installed on the top of the recovery tank 1, with one end of each array connected to a positive electrode mounting and positioning plate 13. Similarly, both the positive electrode mounting and positioning plate 13 and the negative electrode mounting and positioning plate 14 are connected to power lines 10 to provide electrical energy to the positive electrode arrays 8 and 9 to perform electrophoretic reactions in the electrolyte, removing metal ion impurities.

[0055] In some embodiments, please refer to Figure 2 The positive electrode row 8 includes a positive electrode mounting beam 15 and multiple positive electrode plates 16. The two ends of the positive electrode mounting beam 15 are respectively connected to the opposite inner walls of the recycling tank 1, and the same end of the multiple positive electrode mounting beams 15 is connected to the positive electrode mounting positioning plate 13. The multiple positive electrode plates 16 are arranged sequentially along the length direction of the positive electrode mounting beam 15, and the end faces of the positive electrode plates 16 are parallel to the length direction of the positive electrode mounting beam 15. The negative electrode row 9 includes a negative electrode mounting beam 17 and multiple negative electrode plates 18. The two ends of the negative electrode mounting beam 17 are respectively connected to the opposite inner walls of the recycling tank 1, and the same end of the multiple negative electrode mounting beams 17 is connected to the negative electrode mounting positioning plate 14. The multiple negative electrode plates 18 are arranged sequentially along the length direction of the negative electrode mounting beam 17, and the end faces of the negative electrode plates 18 are parallel to the length direction of the negative electrode mounting beam 17.

[0056] Specifically, multiple positive electrode plates 16 are connected to the lower part of the positive electrode mounting beam 15 via corresponding metal rods. These positive electrode plates 16 are arranged along the length of the positive electrode mounting beam 15, thus filling the transverse space above the recovery tank 1. Similarly, multiple negative electrode plates 18 are connected to the lower part of the negative electrode mounting beam 17 via corresponding metal rods. These negative electrode plates 18 are arranged along the length of the negative electrode mounting beam 17, thus filling the transverse space above the recovery tank 1. This allows the multiple positive electrode plates 16 and the multiple negative electrode plates 18 to come into contact with the electrolyte and undergo a sufficient electrophoretic reaction.

[0057] The end faces of the positive electrode 16 and the negative electrode 18 are parallel to the length direction of the positive electrode mounting beam 15, so that the positive electrode 16 and the negative electrode 18 will not be blocked by adjacent electrodes along the length direction of the mounting beam, and can fully contact the electrolyte to ensure the electrophoresis effect.

[0058] In some embodiments, please refer to Figure 1 The positive electrode mounting positioning plate 13 and the negative electrode mounting positioning plate 14 are respectively set on the opposite side walls of the recycling tank 1. The opposite side walls of the recycling tank 1 are also respectively provided with a positive electrode observation window 19 and a negative electrode observation window 20. The positive electrode observation window 19 is set opposite to the positive electrode mounting positioning plate 13 and is located between two adjacent positive electrode rows 8. The negative electrode observation window 20 is set opposite to the negative electrode mounting positioning plate 14 and is located between two adjacent negative electrode rows 9.

[0059] On opposite sidewalls of the recovery tank 1, there are positive electrode observation windows 19 and negative electrode observation windows 20, respectively. Positive electrode observation window 19 is located between two adjacent positive electrode rows 8 and away from the positive electrode mounting plate 13, while negative electrode observation window 20 is located between two adjacent negative electrode rows 9 and away from the negative electrode mounting plate 14. Positive electrode observation windows 19 and negative electrode observation windows 20 are used to observe whether the positive electrode rows 8 and negative electrode rows 9 are fully adsorbed with a metal layer, thus facilitating timely replacement of the positive electrode rows 8 and negative electrode rows 9. The two observation windows are symmetrically arranged on both sides of the recovery tank 1 to provide convenience for observation.

[0060] Preferably, there are two rows of positive electrode rows 8, with ten positive electrode plates 16 installed on the positive electrode mounting beam 15 of each row of positive electrode rows 8, for a total of 20; there are three rows of negative electrode rows 9, with ten negative electrode plates 18 installed on the negative electrode mounting beam 17 of each row of negative electrode rows 9, for a total of 30.

[0061] A switch button is provided on the positive electrode mounting positioning plate 13 for each row of positive electrode 8, and a switch button is also provided on the negative electrode mounting positioning plate 14 for each row of negative electrode 9. By turning the corresponding switch button on and off, the positive electrode 8 and negative electrode 9 can be powered on and off at any time. The electrode 8 covered with the metal layer can be removed and the surface impurities of the electrode sheet can be removed. At the same time, the switch buttons of other electrode 8 can be turned on to power them on, thus ensuring that the electrophoresis of the electrolyte can continue to work.

[0062] Specifically, the positive electrode 16 and the negative electrode 18 are made of lead, which has low hardness. Metal impurities adhering to the surface of the electrode can be removed by using tools such as steel brushes.

[0063] In some embodiments, please refer to Figures 3 to 4 A battery electrolyte impurity treatment system also includes a cleaning cover 21 and a diverter plate 24.

[0064] The cleaning cover 21 is located at the top of the recycling tank 1. A water washing injection pipe 22 is provided on the top of the cleaning cover 21, and a power pump 23 is provided on the water washing injection pipe 22. A diversion plate 24 is located at the bottom of the cleaning cover 21, and multiple diversion holes 25 are evenly opened on the diversion plate 24.

[0065] Specifically, the cleaning cover 21 is located at the top of the recycling tank 1. After all the electrolyte is discharged from the recycling tank 1, the cleaning liquid is introduced into the water washing injection pipe 22. The power pump 23 is a pressure vacuum pump. The pressure vacuum pump provides pressure to the cleaning liquid in the water washing injection pipe 22. The cleaning liquid is sprayed onto the diversion plate 24 and sprayed into the recycling tank 1 through multiple evenly distributed diversion holes 25.

[0066] Please refer to Figure 3 The cross-sectional area of ​​the inner cavity of the cleaning cover 21 gradually decreases from top to bottom, which allows the cleaning fluid entering the cleaning cover 21 through the water washing injection pipe 22 to be distributed onto the diversion plate 24.

[0067] The present invention also provides a method for treating impurities in battery electrolyte, which uses the above-mentioned battery electrolyte impurity treatment system and includes the following steps:

[0068] After the battery formation is completed, the battery is left to stand. The electrolyte is subjected to acid removal at a temperature of 35℃±3℃, followed by electrolyte impurity treatment.

[0069] S1: The electrolyte is injected into the filter box 5. After the large particulate suspended matter and undissolved substances in the electrolyte are removed by the filter layer 6, the electrolyte flows into the recovery tank 1 through the liquid inlet pipe 2.

[0070] S2: After the electrolyte fills the recovery tank 1, turn on the temperature control system 7 to raise the electrolyte temperature to 40℃-50℃ and keep it constant for 30 minutes. Then, open the discharge pipe 4 to initially discharge the impurities that have settled in the sedimentation tank 3 and then close the discharge pipe 4.

[0071] S3: When the positive electrode 8 and negative electrode 9 are energized, the positive electrode 8 and negative electrode 9 form an electrophoretic effect, and the metal ion impurities in the electrolyte adhere to the positive electrode 8 and negative electrode 9.

[0072] The positive electrode row 8 and the negative electrode row 9 are used interchangeably. When the surface of one of the positive electrode rows 8 or one of the negative electrode rows 9 is fully coated with a metal layer or adsorbed with impurities, the other positive electrode row 8 or the other negative electrode row 9 is switched to ensure the continuous electrophoretic reaction of the electrolyte.

[0073] To enable the switching between multiple positive electrode rows 8 and multiple negative electrode rows 9, a corresponding lifting structure can be set on each electrode row. The lifting structure can be used to control the corresponding electrode row to descend so that it is fully immersed in the electrolyte, or to control the corresponding electrode row to rise so that it is removed from the surface of the electrolyte.

[0074] The liquid analyzer 12 contains a liquid analysis chamber and a control module. A solenoid valve is installed on the liquid sampling tube 11, and the solenoid valve is electrically connected to the control module of the liquid analyzer 12. The control module controls the intermittent opening and closing of the solenoid valve to achieve sampling of the electrolyte in the recovery tank 1 at 2-hour intervals. The liquid sampling tube 11 extends into the liquid analysis chamber inside the liquid analyzer 12, and a metal ion sensor is installed in the liquid analysis chamber.

[0075] During the initial sample collection, the control module opens the solenoid valve, allowing the electrolyte to enter the liquid analysis chamber through the sampling pipe 11. The solenoid valve then closes, and the metal ion sensor detects the content of metal ion impurities in the electrolyte and transmits this information to the control module. The control module receives the metal ion impurity content M1+ in the electrolyte within the analysis chamber and then empties the chamber through the drain pipe. After 2 hours, the control module reopens the solenoid valve, allowing the electrolyte to enter the liquid analysis chamber through the sampling pipe 11 again. The solenoid valve then closes, and the metal ion sensor again detects the content of metal ion impurities in the electrolyte and transmits this information to the control module. The control module receives the metal ion impurity content M2+ in the electrolyte within the analysis chamber and then empties the chamber again through the drain pipe. This sampling and testing is performed every 2 hours, sequentially yielding the metal ion impurity content M3+, M4+, ..., M... n +.

[0076] The control system executes the difference calculation program to calculate the difference ΔM+ between two adjacent content measurements, where ΔM+ is respectively ΔM (2-1) +、ΔM (3-2) The obtained ΔM+ value is compared with the standard content value in the control system to calculate the difference rate of the metal ion impurity content.

[0077] When the difference rate between the current and previous metal ion impurity content is greater than or equal to 0.008%, the control module maintains the above procedure until the detected metal ion impurity content M... n + Meets the requirements for electrolyte cleanliness. Open drain pipe 4, and the electrolyte will automatically enter the next process for preparing the secondary battery acid filling electrolyte.

[0078] When the difference rate between the current and previous test results for metal ion impurity content is less than 0.008%, the control module sends a signal to the alarm module, which then emits an audible alarm to remind the operator that there is a problem with the electrophoresis mechanism and that it needs to be checked.

[0079] A level sensor is installed at the top of the recovery tank 1, parallel to the top surface of the electrode array. When the electrolyte reaches the required level in the recovery tank 1, the level sensor sends a control signal to the solenoid valve on the inlet pipe 2 via the controller, automatically closing the solenoid valve and stopping the electrolyte injection. If the level sensor detects a level signal for more than a predetermined time or fails to detect a level signal for an extended period, it indicates that the solenoid valve on the inlet pipe 2 has not closed in time or that there is a leak in the recovery tank 1. In this case, the level sensor sends a control signal to the alarm module via the controller, and the alarm module simultaneously issues an audible and visual alarm to remind the operator to check the electrolyte intake of the inlet pipe 2 and the leakage in the recovery tank 1.

[0080] The solenoid valve on inlet pipe 2 failed to close in time, triggering the alarm system and indicating that the electrolyte was full.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A battery electrolyte impurity treatment system, characterized in that, include: A recycling tank (1) is provided with an inlet pipe (2) on the upper side wall of the recycling tank (1), a sedimentation tank (3) is provided at the bottom of the recycling tank (1), and a discharge pipe (4) is provided at the bottom of the sedimentation tank (3). The filtration mechanism includes a filter box (5) and a filter layer (6). The filter box (5) is connected to the inlet end of the liquid inlet pipe (2). The filter layer (6) is disposed inside the filter box (5) and is used to filter large particulate suspensions and undissolved substances in the electrolyte. Temperature control system (7), the temperature control system (7) is installed in the recovery tank (1) to increase the temperature of the electrolyte in the recovery tank (1) so as to improve the solubility of the electrolyte for negative electrode additives and organic matter; An electrophoresis mechanism is provided, comprising a positive electrode array (8) and a negative electrode array (9), which are respectively disposed at the top of the recovery tank (1). The positive electrode array (8) and the negative electrode array (9) are respectively connected to a power supply via a power line (10) to form an electrophoretic effect on the electrolyte to remove metal ion impurities. The number of positive electrode rows (8) and negative electrode rows (9) are both multiple, and they are arranged side by side on the top of the recycling tank (1); The two ends of the positive electrode array (8) are respectively connected to the opposite inner walls of the recycling tank (1), and the same end of the plurality of positive electrode arrays (8) is provided with a positive electrode mounting and positioning plate (13) connected to the power line (10); The two ends of the negative electrode array (9) are respectively connected to the opposite inner walls of the recycling tank (1), and the same end of the plurality of negative electrode arrays (9) is provided with a negative electrode mounting and positioning plate (14) for connecting the power line (10).

2. The battery electrolyte impurity treatment system as described in claim 1, characterized in that, Also includes: A liquid collection pipe (11) is installed on the lower part of the side wall of the recovery tank (1); A liquid sampling analyzer (12) is connected to the liquid sampling tube (11) and is used to detect the content of metal ion impurities in the electrolyte.

3. The battery electrolyte impurity treatment system as described in claim 1, characterized in that, The sedimentation tank (3) slopes upward from the center outwards, and the discharge pipe (4) is installed longitudinally in the center of the sedimentation tank (3).

4. The battery electrolyte impurity treatment system as described in claim 1, characterized in that, The positive electrode array (8) includes: Positive electrode mounting beam (15), the two ends of the positive electrode mounting beam (15) are respectively connected to the opposite inner walls of the recycling pool (1), and the same end of multiple positive electrode mounting beams (15) is connected to the positive electrode mounting positioning plate (13); Multiple positive electrode plates (16) are arranged sequentially along the length direction of the positive electrode mounting beam (15), and the end face of the positive electrode plate (16) is parallel to the length direction of the positive electrode mounting beam (15). The negative electrode array (9) includes: Negative electrode mounting beam (17), the two ends of the negative electrode mounting beam (17) are respectively connected to the opposite inner walls of the recycling pool (1), and the same end of multiple negative electrode mounting beams (17) is connected to the negative electrode mounting positioning plate (14); Multiple negative electrode plates (18) are arranged sequentially along the length direction of the negative electrode mounting beam (17), and the end face of the negative electrode plate (18) is parallel to the length direction of the negative electrode mounting beam (17).

5. The battery electrolyte impurity treatment system as described in claim 1, characterized in that, The positive electrode mounting positioning plate (13) and the negative electrode mounting positioning plate (14) are respectively disposed on the opposite side walls of the recycling tank (1). The opposite side walls of the recycling tank (1) are also respectively provided with a positive electrode observation window (19) and a negative electrode observation window (20). The positive electrode observation window (19) is disposed opposite to the positive electrode mounting positioning plate (13) and located between two adjacent positive electrode rows (8). The negative electrode observation window (20) is disposed opposite to the negative electrode mounting positioning plate (14) and located between two adjacent negative electrode rows (9).

6. A battery electrolyte impurity treatment system as described in any one of claims 1-5, characterized in that, Also includes: A cleaning cover (21) is provided at the upper end of the recycling tank (1). A water washing injection pipe (22) is provided on the top of the cleaning cover (21), and a power pump (23) is provided on the water washing injection pipe (22). Diverter plate (24) is located at the bottom of the cleaning cover (21), and multiple diverter holes (25) are evenly provided on the diverter plate (24).

7. The battery electrolyte impurity treatment system as described in claim 6, characterized in that, The cross-sectional area of ​​the inner cavity of the cleaning cover (21) gradually decreases from top to bottom.

8. A method for treating impurities in battery electrolyte, using a battery electrolyte impurity treatment system as described in any one of claims 1-7, characterized in that, Includes the following steps: S1: Inject the electrolyte into the filter box (5). After the electrolyte passes through the filter layer (6) to remove large particles of suspended matter and undissolved substances, it flows into the recovery tank (1) through the inlet pipe (2). S2: When the electrolyte fills the recovery tank (1), turn on the temperature control system (7) to raise the electrolyte temperature to 40℃-50℃ and keep it constant for 30 minutes. Then, open the discharge pipe (4) to initially discharge the impurities that have settled in the sedimentation tank (3) and then close the discharge pipe (4). S3: When the positive electrode (8) and negative electrode (9) are energized, the positive electrode (8) and negative electrode (9) form an electrophoretic effect, and metal ion impurities in the electrolyte adhere to the positive electrode (8) and negative electrode (9).

9. The method for treating impurities in battery electrolyte as described in claim 8, characterized in that, In step S3, the liquid analyzer (12) is connected to the recovery tank (1) through the liquid sampling pipe (11). The liquid analyzer (12) samples and analyzes the electrolyte in the recovery tank (1) at 2-hour intervals, calculates the content of metal ion impurities in the electrolyte, and compares the difference between two adjacent contents to determine the operating status of the positive electrode row (8) and the negative electrode row (9).

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