A lithium battery electrolyte recovery device

Abstract

The application relates to the technical field of lithium battery recycling, and particularly discloses a lithium battery electrolyte recovery device, which comprises a recovery box, an air inlet hole one is formed in the top of the recovery box, and a gas recovery assembly is fixed to the air inlet hole one through a connecting pipeline; a filter plate is fixed to the inner wall of the recovery box and located below the air inlet hole one; a mounting groove is formed in the center of the bottom of the recovery box, a blowing box is fixed in the mounting groove, the blowing box extends into the recovery box, air blowing holes are formed in the side walls of the blowing box and communicate with the inside of the recovery box, a nitrogen gas pump is fixed to the bottom of the blowing box, and the nitrogen gas pump is connected with an external nitrogen gas source through an air pipe; powder crushing assemblies are fixed to the side walls of the recovery box, the powder crushing assemblies are located between the blowing box and the filter plate, and the lithium battery electrolyte recovery device can effectively collect electrolyte gas.

Description

Technical Field

[0001] This invention relates to the field of lithium battery recycling technology, and in particular to a lithium battery electrolyte recycling device. Background Technology

[0002] With the rapid development of industries such as new energy vehicles and electronic products, the use of lithium batteries has increased dramatically. However, if lithium batteries are not properly disposed of after reaching the end of their service life, it will not only cause a huge waste of resources but also cause serious environmental pollution. The electrolyte in lithium batteries contains various organic solvents and lithium salts, which are toxic, corrosive, and flammable. If discarded carelessly or improperly disposed of, they will cause serious harm to soil, water sources, and air.

[0003] Currently, the recycling and treatment of spent lithium battery electrolytes has become a focus of industry attention. Existing recycling processes mainly include pretreatment, extraction and separation, purification, and reuse. Pretreatment encompasses disassembly, crushing, and preliminary cleaning. The crushing process involves crushing the disassembled battery components under the protection of inert gases such as nitrogen to further separate the electrolyte. However, this crushing process generates electrolyte gas, and current technologies lack effective collection and separation devices, causing the electrolyte gas to evaporate into the air. This not only wastes resources and pollutes the environment but also prevents the effective recycling of nitrogen, increasing recycling costs.

[0004] Therefore, a lithium battery electrolyte recovery device is proposed to solve the problem that existing lithium battery electrolyte recovery devices cannot effectively collect electrolyte gas. Summary of the Invention

[0005] The purpose of this invention is to provide a lithium battery electrolyte recovery device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A lithium battery electrolyte recycling device includes a recycling tank, the top of which has an air inlet, and a gas recovery component is fixed to the air inlet via a connecting pipe. A filter plate is fixed to the inner wall of the recycling bin, and the filter plate is located below the air inlet. The bottom center of the recycling bin has an installation groove, and an air blowing box is fixed in the installation groove. The air blowing box extends into the recycling bin, and air blowing holes communicating with the inside of the recycling bin are opened on the side walls. A nitrogen pump is fixed at the bottom of the air blowing box and connected to it. The nitrogen pump is connected to an external nitrogen source through an air pipe. The recycling bin has crushing components fixed to its two side walls, and the crushing components are located between the air blowing box and the filter plate. A collection box is detachably installed below the recycling bin. Several filter holes are provided at the bottom of the recycling bin, and the filter holes communicate with the top of the collection box. The side wall of the recycling bin is provided with a feed inlet, and a sealing cover is hinged to the feed inlet; The disassembled batteries are fed into the recycling bin through the inlet. The batteries fall to the crushing component and are crushed. The resulting battery waste and electrolyte liquid mixture flows into the collection box through the filter hole 1. At the same time, the nitrogen pump introduces nitrogen from an external nitrogen source into the blowing box. The nitrogen is blown evenly into the recycling bin through the blowing hole and drives the volatile electrolyte gas upward. After the mixed gas passes through the filter plate to remove solid dust, it enters the gas recovery component through the air inlet 1 and the connecting pipe. After separation by the separation membrane, the nitrogen flows back to the external nitrogen source through the return pipe for recycling, while the electrolyte gas enters the condensation and recovery process.

[0007] Preferably, the filter plate is horizontally positioned directly below the air inlet, and the end face of the filter plate is provided with a plurality of filter holes in an array, the filter holes being used to filter solid dust in the mixed gas.

[0008] Preferably, the crushing component is symmetrically fixed to the inner sidewalls on both sides of the recycling bin by a bracket, and the crushing operation area of ​​the crushing component is directly opposite the middle area inside the recycling bin.

[0009] Preferably, the gas recovery assembly includes a connecting box, multiple collecting pipes, a condenser pipe, and a gas collection box. The top of the connecting box is fixedly connected to and communicates with the connecting pipe. Multiple air inlets are provided at the end of the connecting box away from the connecting pipe. A condenser pipe is fixedly arranged obliquely upward at the end of each of the multiple air inlets away from the connecting box. The gas collection box is fixedly attached at the end of each of the multiple condenser pipes away from the air inlets. An air outlet is provided on the gas collection box. The air outlet is connected to the external nitrogen gas source through a gas pipe.

[0010] Preferably, a plurality of liquid passage pipes are vertically fixed at the bottom of the condenser along its length, and a liquid collection tank is fixed below the plurality of liquid passage pipes, with a valve provided at the bottom of the liquid collection tank.

[0011] Preferably, the valve is made of a corrosion-resistant material.

[0012] Preferably, a nitrogen purification device is connected between the vent and the external nitrogen source, and the nitrogen purification device is used to purify the returned nitrogen.

[0013] Preferably, a plurality of the filter holes are evenly distributed at the bottom of the recycling bin.

[0014] Preferably, the collection box is made of polypropylene.

[0015] Preferably, after the nitrogen pump is started, the oxygen content in the recovery tank is less than 5%.

[0016] The beneficial effects of this invention are as follows: By adding a gas recovery component to the crushing device, the mixture of electrolyte gas and nitrogen generated during the crushing process can be initially filtered to remove solid dust before smoothly entering the gas recovery component. The gas recovery component has a built-in gas separation membrane, which can achieve efficient separation of electrolyte gas and nitrogen, ensuring that the electrolyte gas is fully collected and preventing it from evaporating into the air, thus avoiding resource waste and environmental pollution. During the crushing process, a nitrogen pump introduces nitrogen from an external nitrogen source into the blowing box. The nitrogen is then evenly blown into the recovery tank through the blowing holes, creating an upward airflow. This not only causes the volatile electrolyte gas inside the recovery tank to flow upward, facilitating collection, but also creates a relatively stable inert gas environment, reducing the contact between the electrolyte and oxygen, lowering the risk of electrolyte oxidation and deterioration, and thus improving the quality of the recovered electrolyte. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the overall cross-sectional structure of an embodiment of the present invention; Figure 3 This is an embodiment of the present invention. Figure 2 A magnified diagram of region A.

[0018] In the diagram: 1. Recovery box; 101. Air inlet 1; 102. Connecting pipe; 103. Mounting slot; 104. Air blowing box; 1041. Nitrogen pump; 105. Air blowing hole; 106. Filter hole 1; 107. Filter plate; 1071. Filter hole 2; 108. Feed inlet; 109. Sealing cover; 2. Gas recovery assembly; 201. Connecting box; 202. Collection pipe; 203. Air inlet 2; 204. Condensate pipe; 2041. Liquid pipe; 2042. Liquid collection box; 2043. Valve; 205. Gas collection box; 2051. Air outlet; 3. Crushing assembly; 301. Crushing roller; 302. Drive motor; 303. Reduction mechanism; 4. Collection box. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] When it is necessary to recycle the electrolyte of waste lithium batteries, the recycling process includes pretreatment, extraction and separation, purification, and reuse. Pretreatment includes disassembly, crushing, and preliminary cleaning. The crushing process involves crushing the disassembled battery components under the protection of inert gases such as nitrogen to further separate the electrolyte. Electrolyte gas is generated during the crushing process, which needs to be collected. However, existing technologies lack effective collection and separation devices. This equipment assists in the separation and collection of electrolyte by adding a gas recovery component to the crushing device and optimizing the nitrogen circulation.

[0021] Reference Figures 1-3 A lithium battery electrolyte recovery device includes a recovery box 1, which is a hollow box structure with a closed top and an open bottom. An air inlet 101 is provided on the top of the box. The air inlet 101 is fixedly connected to a gas recovery component 2 through a sealed connecting pipe 102. Corrosion-resistant sealing gaskets are provided at the connection points between the connecting pipe 102 and the air inlet 101 and the gas recovery component 2 to prevent gas leakage.

[0022] A filter plate 107 is fixed to the inner wall of the recycling bin 1. The filter plate 107 is horizontally arranged and located directly below the air inlet 101. The filter plate 107 is detachably sealed to the inner wall of the recycling bin 1, which facilitates disassembly and cleaning later. The filter plate 107 is used to perform preliminary filtration on the rising gas and intercept solid dust mixed in the gas.

[0023] The bottom center of the recycling box 1 has an installation groove 103, which is a cylindrical groove with anti-slip texture on its inner wall. An air blowing box 104 is fixedly installed in the installation groove 103 by bolts. The air blowing box 104 is a hollow box with a closed top and an open bottom, and its upper end extends into the interior of the recycling box 1. The side walls of the air blowing box 104 inside the recycling box 1 are provided with air blowing holes 105 that communicate with the interior of the recycling box 1. The air blowing holes 105 are evenly distributed in a matrix and have a diameter of 2-5mm to ensure that nitrogen can diffuse evenly into the interior of the recycling box 1. A nitrogen pump 1041 is fixedly connected to the bottom of the air blowing box 104 by a flange. The output end of the nitrogen pump 1041 communicates with the interior of the air blowing box 104. The nitrogen pump 1041 is connected to an external nitrogen source through a high-pressure gas pipe. A flow control valve is provided on the high-pressure gas pipe to adjust the nitrogen delivery rate.

[0024] The inner walls on both sides of the recycling bin 1 are symmetrically fixed with crushing components 3. The crushing components 3 are fixedly connected to the inner wall of the recycling bin 1 through a bracket. The bracket is made of stainless steel and has good load-bearing capacity and corrosion resistance. The crushing components 3 are located above the air blowing box 104 and below the filter plate 107, and the crushing operation area of ​​the crushing components 3 is directly facing the middle area inside the recycling bin 1 to ensure that the battery fragments put in can fall accurately into the crushing area.

[0025] A collection box 4 is detachably installed below the recycling box 1. An annular positioning boss is provided on the bottom edge of the recycling box 1, and an annular positioning groove matching the positioning boss is provided on the top edge of the collection box 4. A sealing ring is provided between the positioning boss and the positioning groove to achieve a sealed connection between the collection box 4 and the recycling box 1. Several evenly distributed filter holes 106 are provided at the bottom of the recycling box 1. The diameter of the filter holes 106 is 1-3mm. Several filter holes 106 are connected to the top opening of the collection box 4 to guide the liquid in the recycling box 1 to the collection box 4. A transparent observation window is provided on the side of the collection box 4 to facilitate observation of the amount of electrolyte collected inside.

[0026] The top of the recycling bin 1 is also provided with a feed inlet 108. The size of the feed inlet 108 is adapted to the feeding requirements of common lithium battery fragments. A sealing cover 109 is hinged to the feed inlet 108. A corrosion-resistant sealing gasket is provided on the inner side of the sealing cover 109. When closed, the feed inlet 108 can be sealed. A convenient handle is provided on the outer side of the sealing cover 109 for inserting the disassembled battery into the recycling bin 1. The gas recovery component 2 has a built-in gas separation membrane and reflux pipeline, which can realize the efficient separation of electrolyte gas and nitrogen. The separation membrane is made of polyimide material and has good selective permeation performance of electrolyte gas.

[0027] Basic workflow: Open the sealing cover 109 and put the disassembled battery into the recycling box 1 through the feed inlet 108. The battery falls to the crushing component 3 under its own gravity and is crushed by the crushing component 3. The crushed battery waste and electrolyte are fully mixed to form a slurry. The slurry flows to the bottom of the recycling box 1 under gravity. After being filtered through the filter hole 106 at the bottom of the recycling box 1, some of the larger waste particles are blocked. The liquid electrolyte and fine waste particles enter the collection box 4 together to complete the initial collection. At the same time, the nitrogen pump 1041 is started, and the nitrogen delivery rate is adjusted by the flow control valve to introduce nitrogen from the external nitrogen source into the blowing box 10. 4. Nitrogen gas is evenly blown into the recovery box 1 through the blowing holes 105 on the side wall of the blowing box 104, forming a stable upward airflow, which drives the electrolyte gas volatilized in the recovery box 1 to flow upward. The rising electrolyte gas and nitrogen gas mixture is initially filtered by the filter plate 107 to remove mixed solid dust, and then enters the gas recovery component 2 through the air inlet 101 and the connecting pipe 102. The mixed gas is efficiently separated from the electrolyte gas and nitrogen gas through the separation membrane in the gas recovery component 2. The separated nitrogen gas is reintroduced into the external nitrogen gas source through the return pipe of the gas recovery component 2 to realize the recycling of nitrogen gas. The separated electrolyte gas enters the subsequent condensation and recovery unit to complete liquefaction and recovery.

[0028] In some preferred embodiments, the end face of the filter plate 107 is provided with a plurality of rows of filter holes 1071 arranged in an array. The diameter of the filter holes 1071 is 0.5-1mm, which is smaller than the diameter of the filter holes 106. The plurality of filter holes 1071 are used to precisely filter the fine waste particles after crushing carried by the rising gas, preventing them from entering the connecting pipe 102 and the gas recovery component 2, and ensuring the smoothness of the subsequent gas separation process. The filter plate 107 is made of ceramic filter material, which has good corrosion resistance and filtration stability.

[0029] In some preferred embodiments, the gas recovery assembly 2 includes a connecting box 201, which is a hollow cuboid structure with a guide plate inside to guide the uniform distribution of the mixed gas. The top of the connecting box 201 is fixedly connected to and communicates with the connecting pipe 102, and a plurality of collecting pipes 202 are fixed at the bottom of the connecting box 201. The plurality of collecting pipes 202 are evenly distributed along the length of the connecting box 201 and communicate with the interior of the connecting box 201. They are used to collect the liquid electrolyte after the gaseous electrolyte has been liquefied. The collecting pipes 202 are inclined at an angle of 15-30° to facilitate the smooth flow of the liquid electrolyte.

[0030] In some preferred embodiments, the end of the connecting box 201 away from the connecting pipe 102 is provided with multiple air inlets 203, which are staggered with the collecting pipe 202 to prevent unliquefied gas from directly entering the collecting pipe 202; a condenser pipe 204 is fixed obliquely upward at the end of the multiple air inlets 203 away from the connecting box 201. The condenser pipe 204 adopts a spiral structure to increase the condensation contact area. The condenser pipe 204 is filled with circulating coolant for efficient condensation and liquefaction of electrolyte gas; a gas collecting box 205 is fixed together at the end of the multiple condenser pipes 204 away from the air inlets 203. The gas collecting box 205 is a sealed structure and has an air outlet 2051. The air outlet 2051 is connected to the external nitrogen gas source through a return gas pipe to realize the circulation and return of nitrogen. A one-way valve is provided on the return gas pipe to prevent nitrogen backflow.

[0031] In some preferred embodiments, a plurality of liquid-passing pipes 2041 communicating with the interior of the condenser tube 204 are vertically fixed at the bottom of the condenser tube 204 along its length. A sealing structure is provided at the connection between the liquid-passing pipes 2041 and the condenser tube 204 to prevent coolant leakage. A liquid collection tank 2042 is fixed below the plurality of liquid-passing pipes 2041. The liquid collection tank 2042 is a sealed box made of corrosion-resistant material and is used to store the condensed and liquefied electrolyte. A valve 2043 is provided at the bottom of the liquid collection tank 2042. The valve 2043 is made of corrosion-resistant polytetrafluoroethylene material and is used to conveniently discharge the collected electrolyte. A hose can be connected to the discharge port to facilitate the introduction of the recovered electrolyte into a designated storage container.

[0032] In some preferred embodiments, the crushing component 3 is fixed to the inner sidewalls on both sides of the recycling bin 1 by a height-adjustable bracket, and the height of the crushing component 3 can be adjusted according to the actual crushing requirements; and the crushing component 3 is located above the air blowing box 104 and below the filter plate 107, with the crushing operation area of ​​the crushing component facing the middle area inside the recycling bin 1, ensuring that the crushed waste can be evenly scattered to the bottom of the recycling bin 1.

[0033] In some preferred embodiments, the crushing component 3 adopts a roller crusher in the prior art. The roller crusher specifically includes two symmetrically arranged crushing rollers 301, a drive motor 302, and a reduction mechanism 303. The two crushing rollers 301 are parallel and the gap is adjustable, with a gap adjustment range of 0.5-5mm, which can adapt to the crushing needs of battery fragments of different sizes. The drive motor 302 drives the two crushing rollers 301 to rotate in opposite directions through the reduction mechanism 303, and the rotation speed can be adjusted by a frequency converter. This type of crusher has the characteristics of high crushing efficiency and uniform crushed particles, which can ensure that battery waste is fully crushed and that the electrolyte can be fully separated from the waste.

[0034] In some preferred embodiments, a nitrogen purification device is connected between the vent 2051 and the external nitrogen source. The nitrogen purification device has an activated carbon filter layer and a drying layer built in. The nitrogen purification device purifies and dries the nitrogen before it flows back to the external nitrogen source, removing any trace amounts of electrolyte vapor and moisture that may remain in the nitrogen, thereby improving the quality of the nitrogen and thus improving the recycling efficiency. At the same time, it avoids residual impurities from damaging the nitrogen source equipment.

[0035] In some preferred embodiments, the collection box 4 may be made of polypropylene, which has excellent chemical corrosion resistance, impact resistance and lightweight characteristics. This ensures that while it can withstand the erosion of various chemicals such as carbonates and lithium salts that may be present in the electrolyte, it will not be easily damaged by external forces such as collisions during the operation of the equipment. The bottom of the collection box 4 is provided with an anti-slip pad to enhance the stability of the placement.

[0036] In some preferred embodiments, a liquid level sensor is provided on the side of the collection tank 2042. The liquid level sensor is electrically connected to an external control system. When the electrolyte level in the collection tank 2042 reaches a preset threshold, the control system issues a reminder signal, which facilitates the operator to open the bottom valve in time to discharge the electrolyte. The valve is made of corrosion-resistant polytetrafluoroethylene material, which has excellent sealing performance and can effectively prevent electrolyte leakage, and is used for convenient discharge of collected electrolyte.

[0037] Complete working principle: When electrolyte recovery is required for disassembled battery components, first check the sealing and connection reliability of each component of the device to ensure that the positioning boss at the bottom of the collection box 4 and the recycling box 1 are precisely aligned, the sealing ring is intact, the sealing cover 109 is tightly closed, and all pipeline connections are secure. Then, open the sealing cover 109 at the top feed inlet 108 of the recycling box 1 and uniformly put the disassembled lithium battery fragments into the recycling box 1. During the feeding process, strictly control the feeding rate and amount to avoid excessive accumulation of material that may block the feed inlet 108 or the crushing component 3, and ensure that the material can fall smoothly into the working area of ​​the crushing component 3.

[0038] After feeding is completed, immediately close the sealing cover 109 to ensure that the inside of the recovery box 1 is in a relatively sealed environment to prevent electrolyte gas leakage and the entry of external air. Then start the nitrogen pump 1041 and adjust the flow control valve on the high-pressure gas pipe to introduce nitrogen from the external nitrogen source into the air blowing box 104 at the bottom of the recovery box 1 through the gas pipe. The nitrogen is evenly blown into the inside of the recovery box 1 through the air blowing hole 105. Nitrogen is continuously introduced into the recovery box 1 to replace the air in the box, so that the oxygen content in the recovery box 1 is less than 5%, forming an inert gas protective atmosphere to prevent the electrolyte from contacting the air and causing an oxidation reaction, and at the same time to prevent the dust generated during the crushing process from causing safety hazards.

[0039] After a stable inert atmosphere is formed inside the recycling bin 1, the crushing component 3 is started. The appropriate crushing roller speed is set by the frequency converter, and the drive motor 302 drives the two crushing rollers 301 to rotate in opposite directions through the reduction mechanism 303. The falling battery fragments are crushed by compression and shearing, breaking them into fine waste particles with a particle size of less than 3mm. During the crushing process, nitrogen gas continuously flows upward, which can carry away the heat generated by crushing and prevent excessive local temperature from causing excessive evaporation of electrolyte.

[0040] The crushed battery waste particles come into full contact with and mix with the residual electrolyte liquid inside the battery to form a uniform slurry, laying the foundation for the subsequent filtration and collection of liquid electrolyte. At the same time, the upward airflow formed by the continuous introduction of nitrogen can promote the electrolyte to detach from the surface of the waste particles and volatilize, thereby improving the electrolyte recovery rate.

[0041] The slurry formed in the recovery tank 1 flows to the bottom under its own gravity and undergoes preliminary filtration through the evenly distributed filter holes 106 at the bottom of the recovery tank 1. The filter holes 106 can block larger waste particles with a particle size greater than 3mm, allowing the liquid electrolyte and fine waste particles with a particle size less than 3mm to pass through the filter holes 106 together and be guided to the detachably connected collection box 4 below, thus achieving the initial collection of liquid electrolyte. The operator can observe the amount of slurry collected inside in real time through the transparent observation window on the side of the collection box 4. When the preset collection amount is reached, the equipment operation can be stopped, and the collection box 4 can be disassembled for subsequent slurry processing (such as further filtration to separate fine waste particles and extract pure electrolyte).

[0042] While the nitrogen pump 1041 is started, nitrogen is continuously blown into the recovery tank 1 through the air blowing hole 105, forming a stable upward airflow. This airflow carries the electrolyte gas volatilized in the recovery tank 1 upward along with it. During the upward flow of the mixed gas of electrolyte gas and nitrogen, it first passes through the filter plate 107 horizontally set directly below the air inlet 101. The filter plate 107 has several arrayed filter holes 1071 (pore diameter 0.5-1mm) on its end face, which can accurately filter out the fine solid dust mixed in the gas mixture, preventing dust from entering the subsequent connecting pipe 102 and gas recovery component 2 and causing blockage or pollution, thus ensuring the smoothness of the gas recovery process.

[0043] The mixed gas, after preliminary filtration, enters the connection box 201 of the gas recovery component 2 through the air inlet 101 and the sealed connection pipe 102. The guide plate inside the connection box 201 guides the mixed gas to be evenly distributed, avoiding excessively high local gas concentrations that could affect the separation effect. The mixed gas stays briefly in the connection box 201, and some of the lower-temperature electrolyte gas is liquefied in advance. The resulting liquid electrolyte flows into the collection tank 2042 below through the collection pipe 202 at the bottom of the connection box 201.

[0044] Unliquefied mixed gas enters the spiral condenser 204, which is set at the top of the connecting box 201, through multiple air inlets 203. Coolant is circulating inside the condenser 204 (the temperature of which can be adjusted according to the condensation temperature requirement of the electrolyte). The mixed gas fully contacts the tube wall inside the spiral condenser 204, and the electrolyte gas liquefies rapidly upon cooling to form liquid electrolyte. Several liquid passages 2041, which are set along the length of the bottom of the condenser 204, quickly guide the liquefied liquid electrolyte to the collection tank 2042 below for storage, thus completing the recovery and conversion of electrolyte gas.

[0045] After being processed by the condenser tube 204, the electrolyte gas in the mixed gas has been basically completely liquefied and recovered. The remaining pure nitrogen enters the gas collection box 205 connected to the end of the condenser tube 204. The nitrogen in the gas collection box 205 enters the return gas pipe through the gas outlet 2051 on its surface. The one-way valve on the return gas pipe prevents the nitrogen from flowing back. Then the nitrogen flows through the nitrogen purification device, and the residual trace amounts of electrolyte vapor and moisture are removed by the activated carbon filter layer and the drying layer. The purified nitrogen is then reintroduced into the external nitrogen source to realize the recycling of nitrogen, which greatly reduces the operating energy consumption of the equipment and the cost of nitrogen use.

[0046] When the electrolyte in the collection tank 2042 reaches the preset level, the level sensor sends a warning signal to the external control system. The operator then shuts off the coolant circulation of the condenser 204 and the nitrogen pump 1041, opens the corrosion-resistant valve 2043 at the bottom of the collection tank 2042, and directs the recovered pure liquid electrolyte into the designated storage container through a hose. After discharge, the valve 2043 is closed, and any residual electrolyte inside the collection tank 2042 is cleaned to ensure the purity of subsequent recovery operations.

[0047] After the electrolyte in collection box 4 and collection tank 2042 has been fully recovered, all equipment power is turned off, and the filter plate 107 in the recovery box 1 is disassembled and cleaned to remove surface dust. Simultaneously, residual waste is cleaned from the surface of the crushing roller of the crushing component 3, and the wear condition of each component is checked. Damaged gaskets, filter layers, and other vulnerable parts are replaced promptly to prepare for the next recovery operation. Through this complete process, efficient and safe separation and collection of lithium battery electrolyte are achieved, improving the electrolyte recovery rate and reducing resource waste and environmental pollution.

[0048] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A lithium battery electrolyte recovery device, characterized in that, Includes a recycling bin (1), the top of which is provided with an air inlet (101), and a gas recovery assembly (2) is fixed to the air inlet (101) via a connecting pipe (102); A filter plate (107) is fixed to the inner wall of the recycling bin (1), and the filter plate (107) is located below the air inlet (101); The bottom center of the recycling box (1) is provided with an installation groove (103), and an air blowing box (104) is fixed in the installation groove (103). The air blowing box (104) extends into the recycling box (1), and air blowing holes (105) communicating with the inside of the recycling box (1) are provided on the side walls. A nitrogen pump (1041) is fixed at the bottom of the air blowing box (104) and connected to it. The nitrogen pump (1041) is connected to an external nitrogen source through a gas pipe. The recycling bin (1) has a crushing assembly (3) fixed on both side walls, and the crushing assembly (3) is located between the air blowing box (104) and the filter plate (107); A collection box (4) is detached and installed below the recycling bin (1). The bottom of the recycling bin (1) is provided with a plurality of filter holes (106), and the plurality of filter holes (106) are connected to the top of the collection box (4). The side wall of the recycling bin (1) is provided with a feed inlet (108), and a sealing cover plate (109) is hinged to the feed inlet (108). The disassembled battery is put into the recycling box (1) through the feed port (108). The battery falls to the crushing component (3) and is crushed. The battery waste and electrolyte liquid mixed slurry formed after crushing flows into the collection box (4) through the filter hole (106) for collection. At the same time, the nitrogen pump (1041) introduces nitrogen from the external nitrogen source into the blowing box (104). The nitrogen is blown evenly into the recycling box (1) through the blowing hole (105) and drives the volatile electrolyte gas to flow upward. After the mixed gas is filtered by the filter plate (107) to remove solid dust, it enters the gas recovery component (2) through the air inlet (101) and the connecting pipe (102). After separation by the separation membrane, the nitrogen flows back to the external nitrogen source through the return pipe to achieve recycling. The electrolyte gas enters the condensation recovery process.

2. The lithium battery electrolyte recovery device according to claim 1, characterized in that, The filter plate (107) is horizontally positioned directly below the air inlet (101), and the end face of the filter plate (107) is provided with a plurality of filter holes (1071) arranged in an array. The filter holes (1071) are used to filter solid dust in the mixed gas.

3. The lithium battery electrolyte recovery device according to claim 1, characterized in that, The crushing component (3) is symmetrically fixed to the inner sidewalls on both sides of the recycling box (1) by a bracket, and the crushing operation area of ​​the crushing component (3) is directly opposite the middle area inside the recycling box (1).

4. The lithium battery electrolyte recovery device according to claim 1, characterized in that, The gas recovery assembly (2) includes a connecting box (201), multiple collecting pipes (202), a condenser pipe (204), and a gas collection box (205). The top of the connecting box (201) is fixedly connected to and communicates with the connecting pipe (102). Multiple air inlets (203) are provided at one end of the connecting box (201) away from the connecting pipe (102). A condenser pipe (204) is fixedly arranged obliquely upward at one end of each of the multiple air inlets (203) away from the connecting box (201). The gas collection box (205) is fixedly connected at one end of each of the multiple condenser pipes (204) away from the air inlets (203). An air outlet (2051) is provided on the gas collection box (205). The air outlet (2051) is connected to the external nitrogen gas source through a gas pipe.

5. A lithium battery electrolyte recovery device according to claim 4, characterized in that, The bottom of the condenser tube (204) is vertically fixed with several liquid passage pipes (2041) along its length. Below the several liquid passage pipes (2041) is a liquid collection tank (2042), and a valve (2043) is provided at the bottom of the liquid collection tank (2042).

6. A lithium battery electrolyte recovery device according to claim 5, characterized in that, The valve (2043) is made of corrosion-resistant material.

7. A lithium battery electrolyte recovery device according to claim 4, characterized in that, A nitrogen purification device is connected between the air outlet (2051) and the external nitrogen source. The nitrogen purification device is used to purify the returned nitrogen.

8. A lithium battery electrolyte recovery device according to claim 1, characterized in that, Several of the filter holes (106) are evenly distributed at the bottom of the recycling bin (1).

9. A lithium battery electrolyte recovery device according to claim 1, characterized in that, The collection box (4) is made of polypropylene.

10. A lithium battery electrolyte recovery device according to claim 1, characterized in that, After the nitrogen pump (1041) is started, the oxygen content in the recovery tank (1) is less than five percent.

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