CN106941199B - Safety processing device before recycling of lithium ion battery - Google Patents
Safety processing device before recycling of lithium ion battery Download PDFInfo
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- CN106941199B CN106941199B CN201710272148.4A CN201710272148A CN106941199B CN 106941199 B CN106941199 B CN 106941199B CN 201710272148 A CN201710272148 A CN 201710272148A CN 106941199 B CN106941199 B CN 106941199B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/54—Reclaiming serviceable parts of waste accumulators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/84—Recycling of batteries or fuel cells
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Abstract
The invention relates to a lithium ion batteryA safe processing method and a device before recycling batteries, and a safe recycling method of lithium ion batteries. The security processing method comprises the following steps: 1) placing the lithium ion battery or the battery cell with the opening in a sealed cavity, and vacuumizing the sealed cavity; 2) adding an impregnation liquid into the sealed cavity for impregnation treatment, wherein the impregnation liquid is a mixed solution of water-soluble organic matters and water, and the mass ratio of the water-soluble organic matters to the water is (3-19): 1, discharging the waste impregnation liquid after soaking. The invention provides a safe treatment method, which adopts a mixed solution of water-soluble organic matters and water as a treatment solution to reduce the reaction rate of water and residual lithium in a battery cell and avoid H2The enrichment of combustible gas and heat is realized, and the safety is high; can simultaneously realize residual lithium and LiPF6Thoroughly eliminate, need not to disassemble or the breakage in protective atmosphere through battery or the electric core after handling, improved the security and the efficiency of disassembling of follow-up electric core disassembly recovery process.
Description
Technical Field
The invention belongs to the technical field of recovery of lithium ion power batteries, and particularly relates to a safety treatment method and a safety treatment device before recycling of a lithium ion battery, and a safety recovery method of the lithium ion battery.
Background
With the vigorous popularization of new energy automobiles by the government of China, particularly the encouragement and support of lithium ion power battery automobiles, a large amount of waste lithium ion power batteries can be generated in the future. Because the raw materials of the lithium ion battery contain a large amount of rare and precious metals such as nickel, cobalt, red copper, lithium and the like, and the scrapped lithium ion battery contains inflammable electrolyte and highly toxic LiPF6Therefore, improper recovery and treatment of the waste lithium ion power battery can not only cause resource waste, but also bring certain pollution problems.
Although some domestic waste batteries are directly recycled and classified by magnetic separation, gravity separation and air separation after the batteries are integrally crushed, the effective separation of various materials is difficult to realize in the separation process after the batteries are crushed in the treatment process, and particularly, a large amount of copper, aluminum, graphite and plastics are mixed in the obtained battery materials. Therefore, in order to reduce the content of a large amount of impurities in the material and reduce the post-treatment cost, a more reasonable method is to disassemble the waste lithium ion power battery cell into a positive plate, a negative plate and a diaphragm, and then realize the classified recycling of various substances through the subsequent treatment.
The patent with the publication number of CN103825064B discloses an environment-friendly recovery process method of waste power lithium iron phosphate batteries, which comprises the steps of extracting electrolyte in a battery after the battery is completely discharged, adding a certain amount of solvent or replacement liquid, standing for 30min, and then extracting liquid in the battery; and cutting the battery along the top by adopting a cold cutting method, thereby realizing the classified recovery of the shell, the PP plate accessories, the anode, the cathode and the diaphragm.
In the process of disassembling the electric core of the lithium ion battery, because irreversible lithium (residual lithium) which cannot return to a positive material due to a circulation process exists in the electric core, safety problems such as fire, explosion and the like are easily caused; meanwhile, LiPF present in the cell6Exposed in the air, easily react with vapor and produce poisonous gases such as HF, above-mentioned factor results in the process of disassembling of lithium ion battery electricity core to go on in protective atmosphere to guarantee to disassemble process safety, however this kind of processing method has influenced efficiency and flexibility ratio that the electricity core was disassembled to a great extent, also can't fundamentally eliminate potential safety hazards such as fire, poisonous harmful volatile organic compounds harm operating personnel.
Disclosure of Invention
The invention aims to provide a safety treatment method before recycling of a lithium ion battery, which can effectively remove residual lithium and lithium hexafluorophosphate, fundamentally solve the potential safety hazard and the influence on the environment when a battery core is disassembled, and the disassembly of the battery or the battery core after treatment does not need to be carried out in a protective atmosphere.
A second object of the present invention is to provide a safety disposal device before recycling of a lithium ion battery.
The third purpose of the invention is to provide a safe recovery method of the lithium ion battery.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a safety processing method before recycling of a lithium ion battery comprises the following steps:
1) placing the lithium ion battery with the opening or the battery cell with the battery shell removed in a sealed cavity, vacuumizing the sealed cavity until the vacuum degree is not higher than-0.095 MPa, and maintaining the pressure for at least 2 min;
2) adding impregnation liquid into the sealed cavity for impregnation treatment, vacuumizing the sealed cavity during the impregnation treatment, and keeping the vacuum degree not higher than-0.095 MPa; then discharging the dipping waste liquid after dipping treatment; the impregnation liquid is a mixed solution of water-soluble organic matters and water, and the mass ratio of the water-soluble organic matters to the water is (3-19): 1.
step 1) can be regarded as the preliminary evacuation to the seal chamber body, through preliminary evacuation process, can promote later stage maceration extract to get into open-ended battery or the lithium ion battery electric core after the battery shell is removed, should handle and make ready for the maceration disposal.
In the step 2), during dipping treatment, the micro-negative pressure state with the vacuum degree not higher than-0.095 MPa is kept, and hydrogen generated in the sealed cavity can be discharged in time, so that the related reaction is promoted to be rapidly carried out, the aggregation of flammable and explosive gases such as hydrogen and the like is prevented, and the safety of the production process is improved.
In the present invention, a mixed solution of a water-soluble organic substance and water, lithium, and LiPF6The reaction formula (c) is as follows, since the water-soluble organic substance greatly dilutes the concentration of water, the reaction rate is slow, and if the water-soluble organic substance is a low molecular alcohol, the reactions in (iv) and (v) occur simultaneously:
2Li+2H2O→2LiOH+H2 ①；
LiPF6+H2O→LiF+POF3+2HF ②；
POF3+3H2O→H3PO4+3HF ③；
2Li+2ROH→2ROLi+H2 ④；
ROLi+H2O→LiOH+ROH ⑤；
in the above reaction process, water and water are dissolved inThe proportion of organic matters is crucial to the elimination degree of residual lithium and lithium hexafluorophosphate, for example, the water content is too large because of the water, the lithium and the LiPF6The reaction speed is high, and the reaction speed is too high, so that heat, inflammable and explosive gases can be enriched at the same time, and the safety production is not facilitated. If the amount of the water-soluble organic substance is too large, the reaction activity is reduced, the reaction speed is slowed down, and the residual lithium and LiPF are also generated6It is difficult to completely remove.
The safe treatment method before recycling of the lithium ion battery provided by the invention adopts the mixed solution of water-soluble organic matters and water with certain concentration as the treatment solution, the reaction rate is proper, and H is avoided2The enrichment of combustible gas and heat is realized, and the safety is high; lithium and LiPF caused by too fast or too slow reaction are avoided6The incomplete elimination phenomenon of (2) can be realized, the treated battery or battery cell does not need to be disassembled in the protective atmosphere, and the safety and the disassembling efficiency of the subsequent battery cell disassembling and recovering process are improved.
In the step 2), the time of the dipping treatment is more than 0.1 h.
Preferably, the method further comprises the step 3): and vacuumizing the sealed cavity, keeping the vacuum degree not higher than-0.095 MPa, stopping vacuumizing when the impregnation waste liquid is generated in the system, and discharging the impregnation waste liquid. In the step, the vacuum degree is kept to be not higher than-0.095 MPa, so that the impregnation waste liquid in the lithium ion battery cell can be fully discharged, and the release of organic matters in the subsequent recovery process is eliminated to the greatest extent.
Further preferably, the step 3) can be repeated for 1-20 times so as to fully discharge the dipping waste liquid. The waste liquid after impregnation is purified by calcium hydroxide and then is recycled for impregnation treatment.
In the step 2) and/or the step 3), volatile substances obtained by vacuumizing are condensed, recovered and combined into the impregnation waste liquid.
The water-soluble organic matter is low molecular alcohol or acetone. The low molecular alcohol is methanol, ethanol or propanol.
The removal of fluorine can be rapidly realized through the purification treatment of calcium hydroxide suspension or hydrated lime on the impregnation liquid, and the obtained impregnation liquid can be directly recycled.
Furthermore, by adopting the safety treatment method before recycling of the lithium ion battery, the impregnation treatment is carried out in the sealed tank body, through the optimized setting of the vacuumizing and liquid discharging processes, on the basis of eliminating residual lithium and lithium hexafluorophosphate in the lithium ion battery cell, the impregnation waste liquid is fully separated, and the subsequent process of disassembling the cell into the positive plate and the negative plate does not need to be carried out in the protective atmosphere. Meanwhile, the safe treatment method reasonably treats inflammable gases such as hydrogen, ethanol and the like generated in the soaking process, and has high safety; the impregnation liquid can be recycled, which is beneficial to reducing the production cost of enterprises and realizing green production.
A safety processing device before recycling of a lithium ion battery comprises an impregnation liquid storage tank, an impregnation waste liquid storage tank, a condenser and vacuumizing equipment, wherein an outlet of the impregnation liquid storage tank is communicated with an inlet of the impregnation tank through a first connecting pipeline and is used for introducing impregnation liquid in the impregnation liquid storage tank into the impregnation tank; the impregnation tank is provided with a liquid outlet which is communicated with an inlet of the impregnation waste liquid storage tank through a second connecting pipeline and is used for discharging the impregnation waste liquid generated by impregnation in the impregnation tank into the impregnation waste liquid storage tank; the dipping tank is further provided with a gas outlet which is communicated with an inlet of a condenser, an outlet of the condenser is connected with a vacuumizing device, the condenser is further provided with a liquid discharge port for discharging condensate, and the liquid discharge port of the condenser is communicated with an inlet of the dipping waste liquid storage tank.
Preferably, the system also comprises a purification system for purifying the impregnation waste liquid, wherein the purification system is provided with an inlet and an outlet, the inlet of the purification system is communicated with the outlet of the impregnation waste liquid storage tank, and the outlet of the purification system is communicated with the inlet of the impregnation waste liquid storage tank for recovering the impregnation waste liquid after purification treatment.
The safety treatment device before recycling of the lithium ion batteries, provided by the invention, has the advantages of simple structure and reasonable design, can be used for continuously, safely and harmlessly treating the disassembly and recycling of the waste lithium ion batteries, and can be used for improving the efficiency and safety of the subsequent disassembly and recycling of the lithium ion batteries.
A safe recovery method of a lithium ion battery comprises the following steps:
a) opening the lithium ion battery or removing the battery shell to obtain a battery core;
b) placing the opened lithium ion battery or battery cell in a sealed cavity, vacuumizing the sealed cavity until the vacuum degree is not higher than-0.095 MPa, and maintaining the pressure for at least 2 min;
c) adding impregnation liquid into the sealed cavity for impregnation treatment, vacuumizing the sealed cavity during the impregnation treatment, and keeping the vacuum degree not higher than-0.095 MPa; then discharging the dipping waste liquid after dipping treatment; the impregnation liquid is a mixed solution of water-soluble organic matters and water, and the mass ratio of the water-soluble organic matters to the water is (3-19): 1;
d) vacuumizing the sealed cavity, keeping the vacuum degree not higher than-0.095 MPa, stopping vacuumizing when the system generates the impregnation waste liquid, and discharging the impregnation waste liquid;
e) and d), after the step d) is repeated for 1-20 times, taking out the lithium ion battery or the battery cell, and disassembling or crushing and sorting.
According to the safe recovery method of the lithium ion battery, residual lithium and lithium hexafluorophosphate in the battery are thoroughly eliminated, after the impregnation waste liquid is sufficiently removed, potential safety hazards and environmental influences during the disassembly of the battery cell can be fundamentally solved, the subsequent disassembly process is not required to be carried out in a protective atmosphere, and the efficiency and the flexibility of the disassembly of the battery cell are greatly improved.
Drawings
FIG. 1 is a process flow diagram of the safety treatment process of the present invention;
FIG. 2 is a schematic structural diagram of the safety treatment apparatus of the present invention, wherein 1-impregnation liquid storage tank, 2-impregnation tank, 3-impregnation waste liquid storage tank, 4-condenser, 5-vacuum pumping equipment, and 6-purification system.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Example 1
The safety processing device before recycling of the lithium ion battery in this embodiment, as shown in fig. 2, includes an immersion liquid storage tank 1, an immersion tank 2, an immersion waste liquid storage tank 3, a condenser 4, a vacuum pumping apparatus 5 and a purification system 6, wherein an outlet of the immersion liquid storage tank is communicated with an inlet of the immersion tank through a first connecting pipe, and is used for introducing the immersion liquid in the immersion liquid storage tank into the immersion tank; the impregnation tank is provided with a liquid outlet which is communicated with an inlet of the impregnation waste liquid storage tank through a second connecting pipeline and is used for discharging the impregnation waste liquid generated by impregnation in the impregnation tank into the impregnation waste liquid storage tank; the impregnation tank is also provided with an air outlet which is communicated with an inlet of a condenser, an outlet of the condenser is connected with a vacuum pumping device, the condenser is also provided with a liquid outlet for discharging condensate, and the liquid outlet of the condenser is communicated with an inlet of the impregnation waste liquid storage tank; the exit linkage of flooding waste liquid basin has clean system 6 to be used for purifying the flooding waste liquid, and clean system's export links to each other with the entry of flooding liquid basin and is used for retrieving the flooding waste liquid after the purification. The liquid outlet of the impregnation tank is controlled to be opened or closed by a liquid outlet valve; the first connecting pipeline is provided with a first liquid pump, and the second connecting pipeline is provided with a second liquid pump.
Example 2
The safety processing method before the recycling of the lithium ion battery has the technical flow chart as shown in figure 1, and the adopted safety processing device as shown in figure 2 comprises the following steps:
1) putting the battery core without the battery shell into an impregnation tank, vacuumizing the tank body to-0.08 MPa, and then adding sufficient impregnation liquid into the impregnation tank for impregnation treatment, wherein the impregnation liquid is a mixture of ethanol and water in a mass ratio of 95: 5; vacuumizing the impregnation tank, keeping the vacuum degree at-0.095 MPa, soaking for 2h, opening a liquid discharge valve of the impregnation tank, discharging the impregnation waste liquid after impregnation treatment through a second liquid pump, and closing the liquid discharge valve;
2) vacuumizing the impregnation tank, keeping the vacuum degree at-0.05 MPa, stopping vacuumizing when flowing impregnation waste liquid is generated in the system, opening a liquid discharge valve of the impregnation tank, and discharging the impregnation waste liquid through a second liquid suction pump; after the step is repeated for 4 times, the pressure release valve on the impregnation tank is opened, the cover body is opened after the pressure in the tank body is recovered to the normal pressure, the battery core is taken out, and then the battery core can be safely disassembled.
In the step 1) and the step 2), volatile substances obtained by vacuumizing are condensed, recovered and combined into the impregnation waste liquid; the waste liquid after impregnation is purified by calcium hydroxide and then is recycled for impregnation treatment.
In the safety recovery method of the lithium ion battery in this embodiment, the battery core obtained by the safety treatment method in this embodiment is disassembled and recovered subsequently, so as to obtain the positive plate, the negative plate, and the diaphragm, respectively. The recovery process does not need to be carried out under protective atmosphere, and has no fire risk and no generation of toxic and harmful gases.
Example 3
In the safety processing method before recycling of the lithium ion battery of the embodiment, a process flow diagram is shown in fig. 1, and an adopted safety processing device is shown in fig. 2, and the method comprises the following steps:
1) putting the open battery into an impregnation tank, vacuumizing the impregnation tank to enable the vacuum degree to be-0.05 MPa, and maintaining the pressure for 5 min;
2) adding sufficient impregnation liquid into an impregnation tank for impregnation treatment, wherein the impregnation liquid is a mixture of ethanol and water in a mass ratio of 75: 25; vacuumizing the impregnation tank, keeping the vacuum degree not higher than-0.09 MPa, soaking for 0.5h, and discharging impregnation waste liquid after impregnation treatment;
3) vacuumizing the impregnation tank, keeping the vacuum degree not higher than-0.09 MPa, stopping vacuumizing when flowing impregnation waste liquid is generated in the system, and discharging the impregnation waste liquid; after the step is repeated for 5 times, opening a pressure release valve on the impregnation tank, opening the cover body after the pressure in the tank body is recovered to the normal pressure, taking out the electric core, and then safely disassembling.
In the step 2) and the step 3), volatile substances obtained by vacuumizing are condensed, recovered and combined into the impregnation waste liquid; the waste liquid after impregnation is purified by calcium hydroxide and then is recycled for impregnation treatment.
The method for safely recycling the lithium ion battery in the embodiment is to perform subsequent crushing, sorting and recycling on the battery obtained by the safety treatment method in the embodiment. The recovery process does not need to be carried out under protective atmosphere, and has no fire risk and no generation of toxic and harmful gases.
Example 4
In the safety treatment method before recycling of the lithium ion battery of the embodiment, a process flow diagram is shown in fig. 1, and an adopted device is shown in fig. 2, and the method comprises the following steps:
1) putting the open battery into an impregnation tank, vacuumizing the impregnation tank to enable the vacuum degree to be-0.095 MPa, and maintaining the pressure for 2 min;
2) adding sufficient impregnation liquid into an impregnation tank for impregnation treatment, wherein the impregnation liquid is a mixture of ethanol and water in a mass ratio of 19: 1; vacuumizing the impregnation tank, keeping the vacuum degree at-0.095 MPa, soaking for 6h, and discharging impregnation waste liquid after impregnation treatment;
3) vacuumizing the impregnation tank, keeping the vacuum degree at-0.095 MPa, stopping vacuumizing when flowing impregnation waste liquid is generated in the system, and discharging the impregnation waste liquid; after the step is repeated for 5 times, opening a pressure release valve on the impregnation tank, opening the cover body after the pressure in the tank body is recovered to the normal pressure, taking out the electric core, and then safely disassembling.
In the step 2) and the step 3), volatile substances obtained by vacuumizing are condensed, recovered and combined into the impregnation waste liquid; the waste liquid after impregnation is purified by calcium hydroxide and then is recycled for impregnation treatment.
The method for safely recycling the lithium ion battery in the embodiment is to perform subsequent crushing, sorting and recycling on the battery obtained by the safety treatment method in the embodiment. The recovery process does not need to be carried out under protective atmosphere, and has no fire risk and no generation of toxic and harmful gases.
Example 5
The safety processing method before recycling of the lithium ion battery in the embodiment comprises the following steps:
1) placing the battery core without the battery shell into an impregnation tank, vacuumizing the impregnation tank to enable the vacuum degree to be-0.095 MPa, and maintaining the pressure for 5 min;
2) adding sufficient impregnation liquid into an impregnation tank for soaking treatment, wherein the impregnation liquid is a mixture of acetone and water; the mass ratio of the two is 9: 1. vacuumizing the impregnation tank, keeping the vacuum degree at-0.095 MPa, and discharging the impregnation waste liquid after the impregnation treatment after the impregnation for 1 hour;
3) vacuumizing the impregnation tank, keeping the vacuum degree at-0.075 MPa, stopping vacuumizing when a flowing impregnation waste liquid is generated in the system, and discharging the impregnation waste liquid; after the step is repeated for 5 times, opening a pressure release valve on the impregnation tank, opening a cover body after the pressure in the tank body is recovered to normal pressure, taking out the electric core, and then carrying out safe recovery.
In this embodiment, the water reacts mildly with the inside of the battery to generate hydrogen gas which is discharged in order, and the generated heat is diffused in time.
The method for safely recycling the lithium ion battery in the embodiment is to disassemble the battery core obtained by the safety treatment method in the embodiment subsequently to obtain the positive plate, the negative plate and the diaphragm respectively, and the recycling process is not required to be carried out under a protective atmosphere, so that the method has no fire risk and no toxic and harmful gas.
Comparative example 1
The safety treatment method of the lithium ion battery of the comparative example 1 before recycling adopts the following steps:
1) placing the battery core without the battery shell into an impregnation tank, vacuumizing the impregnation tank to enable the vacuum degree to reach-0.03 MPa, and maintaining the pressure for 5 min;
2) adding sufficient impregnation liquid into an impregnation tank for impregnation treatment, wherein the impregnation liquid is water; vacuumizing the impregnation tank, keeping the vacuum degree at-0.095 MPa, soaking for 1h, and discharging impregnation waste liquid after impregnation treatment;
3) vacuumizing the impregnation tank, keeping the vacuum degree at-0.09 MPa, stopping vacuumizing when flowing impregnation waste liquid is generated in the system, and discharging the impregnation waste liquid.
In comparative example 1, water rapidly reacts with the remaining lithium in the battery to generate a large amount of hydrogen gas and a large amount of heat, which is difficult to be discharged in a short time, and at this time, the impregnation tank has a large amount of hydrogen gas, which is dangerous; meanwhile, water is difficult to volatilize compared with ethanol, the water in the battery cell is difficult to be quickly discharged through vacuumizing evaporation, the step 3) needs to be repeated for at least 10 times, and the influence of the residual water on the surface of the battery cell on the post-treatment of the battery cell is small.
Comparative example 2
The safety treatment method of the lithium ion battery of the comparative example 2 before recycling comprises the following steps:
1) placing the battery core without the battery shell into an impregnation tank, vacuumizing the impregnation tank to enable the vacuum degree to reach-0.09 MPa, and maintaining the pressure for 5 min;
2) adding sufficient impregnation liquid into an impregnation tank for impregnation treatment, wherein the impregnation liquid is ethanol; vacuumizing the impregnation tank, keeping the vacuum degree at-0.01 MPa, soaking for 3h, and discharging impregnation waste liquid after impregnation treatment;
3) vacuumizing the impregnation tank, keeping the vacuum degree at-0.095 MPa, stopping vacuumizing when flowing impregnation waste liquid is generated in the system, and discharging the impregnation waste liquid; and after repeating the step for 3 times, opening a pressure release valve on the impregnation tank, opening the cover body after the pressure in the tank body is recovered to the normal pressure, and taking out the battery cell for subsequent recovery.
In comparative example 2, ethanol and residual lithium in the battery were completely eliminated, hydrogen gas generated in the process was slowly discharged, and heat generated continuously was slowly dissipated; LiPF in battery6Part of the LiPF is dissolved in ethanol immersion liquid, part of the LiPF remains in the battery cell, and the LiPF is dissolved in ethanol6And is simultaneously carried out. Due to the ethanol to LiPF6Limited solubility of (2), LiPF in the core6And the fluoride gas is not completely treated, and more environment pollutants are generated in the later-stage disassembly and recovery process.
The method of comparative example 2 is used for subsequent crushing and recycling of the battery cell, and although the subsequent crushing and recycling is not carried out in a protective atmosphere, the fire risk is avoided, but a small amount of toxic and harmful gas is generated.
Claims (2)
1. A safety processing device before recycling of a lithium ion battery is characterized by comprising an impregnation liquid storage tank, an impregnation waste liquid storage tank, a condenser and vacuumizing equipment, wherein an outlet of the impregnation liquid storage tank is communicated with an inlet of the impregnation tank through a first connecting pipeline and used for introducing impregnation liquid in the impregnation liquid storage tank into the impregnation tank; the impregnation tank is provided with a liquid outlet which is communicated with an inlet of the impregnation waste liquid storage tank through a second connecting pipeline and is used for discharging the impregnation waste liquid generated by impregnation in the impregnation tank into the impregnation waste liquid storage tank; the dipping tank is further provided with a gas outlet which is communicated with an inlet of a condenser, an outlet of the condenser is connected with a vacuumizing device, the condenser is further provided with a liquid discharge port for discharging condensate, and the liquid discharge port of the condenser is communicated with an inlet of the dipping waste liquid storage tank.
2. A safety management device according to claim 1, further comprising a purification system for purifying the spent impregnation liquid, the purification system having an inlet and an outlet, the inlet of the purification system being in communication with the outlet of the storage tank for the spent impregnation liquid, and the outlet of the purification system being in communication with the inlet of the storage tank for the spent impregnation liquid after the purification process for recovering the spent impregnation liquid.
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| CN109103527B (en) * | 2018-08-23 | 2020-06-12 | 清华四川能源互联网研究院 | Waste power battery discharging device and method |
| CN108808156B (en) * | 2018-08-24 | 2020-10-16 | 广西师范大学 | Method for recovering electrolyte in waste lithium ion battery |
| DE102019133929A1 (en) * | 2019-12-11 | 2021-06-17 | Accurec Recycling GmbH | Method for safely discharging at least one electrochemical energy storage cell arranged in an energy storage housing, and a discharge device therefor |
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