A lithium ion battery water discharging method and discharging device

Abstract

The present invention discloses a method and device for discharging lithium-ion batteries by soaking them in water, wherein the method comprises the following steps: placing the batteries in a discharge box and sealing the box cover; injecting a discharge solution into the discharge box until the liquid level covers all the batteries; collecting tail gas, dissolving the precipitated sodium chloride crystals, inhibiting the generation of aluminum hydroxide, and spraying to remove the attachments on the surface of the batteries; after the discharge is completed, the batteries are taken out of the discharge box. The discharge device is suitable for the above-mentioned discharge method, and comprises a discharge box, which is equipped with a spray device, and the discharge box is connected to a tail gas recovery device and a pH value adjustment device. The present application can collect the hydrogen generated during the discharge process, avoiding the potential safety hazards caused by the chemical discharge method. In addition, it effectively solves the precipitation problem of aluminum hydroxide and sodium chloride, reduces the impurity content of the product, improves the product quality of the battery black powder, and simplifies the difficulty of subsequent wet recovery and impurity removal operations.

Description

Technical Field

[0001] The invention belongs to the technical field of solid waste treatment, and in particular relates to a water discharging method and a discharging device for recycling retired lithium-ion batteries. Background Art

[0002] With the rise of the new energy industry, batteries are being used more and more widely. Electric vehicles, smart phones, laptops and other devices cannot do without batteries. When batteries reach the end of their service life, they need to be recycled and processed. Batteries with high remaining capacity can be used in cascades, while batteries with capacity decay too quickly need to be recycled. Battery recycling refers to the crushing and disassembly of retired batteries through chemical, physical, biological and other means, and the recovery and purification of valuable metals such as nickel, cobalt and lithium after disassembly for recycling. From the perspective of production safety, batteries entering the recycling channel need to be discharged before crushing.

[0003] There are two main methods for safe discharge of used lithium-ion batteries. One is physical discharge, which is mainly discharged through an external load, that is, the battery is connected to a resistor, and the electricity in the battery is converted into heat energy for consumption; the other is chemical discharge, which uses the positive and negative metals of the battery as the cathode and anode to consume the residual electricity in the battery through an electrolysis process in the solution.

[0004] However, the physical discharge method has two disadvantages. First, the discharge process has a high safety risk. Due to the poor self-stability of retired batteries, leakage or internal short circuit, it is very easy to cause a fire during the discharge process. Second, the cost is high. During large-scale discharge, a large number of discharge fixtures and manual loading and unloading are required to meet the discharge needs, and the equipment and labor costs are high. Therefore, physical discharge is often used in laboratories, and most existing recycling companies choose chemical discharge methods with low risks and low costs. Currently, sodium chloride solution is mainly used as the electrolyte. However, this method has the following problems during the discharge process:

[0005] 1. During the discharge process, as the reaction proceeds, the electrolyte (main component LiPF6) inside the battery will enter the water and produce hydrogen fluoride. In addition, hydrogen will be formed during the reaction. If the hydrogen concentration in the discharge box is not handled in time or reduced, an explosion is very likely to occur.

[0006] 2. In the actual production process, there will be a lot of precipitation attached to the surface of the battery. After testing, it was found that the main components of these precipitations are aluminum hydroxide and precipitated sodium chloride, etc., and this type of precipitation is difficult to be separated in the subsequent separation process, which in turn affects the product quality of battery black powder. In particular, aluminum hydroxide deposition will cause great difficulties to the back-end wet recovery and impurity removal process, increasing the battery recycling cost. Summary of the invention

[0007] The technical problem to be solved by the present invention is to overcome the deficiencies and defects mentioned in the above background technology and provide a lithium ion battery water discharging method and a discharging device.

[0008] In order to solve the above technical problems, the technical solution proposed by the present invention is:

[0009] A method for discharging a lithium-ion battery by soaking it in water comprises the following steps:

[0010] S1, place the battery into the discharge box and seal the box cover;

[0011] S2, inject the discharge solution into the discharge box until the liquid level covers all the batteries;

[0012] S3, collects tail gas, dissolves precipitated sodium chloride crystals, inhibits the generation of aluminum hydroxide, and sprays to remove attachments on the battery surface;

[0013] S4, after the discharge is completed, take the battery out of the discharge box.

[0014] Placing the battery in a sealed discharge box for discharge and collecting tail gas can prevent the reaction gas generated during the discharge process from leaking out, causing environmental pollution and safety hazards. By replenishing the liquid and dissolving the precipitated sodium chloride crystals in time, creating an environment that inhibits the production of aluminum hydroxide, the precipitate generated during the discharge process can be reduced, and the deposition of attachments on the battery surface can be reduced from the source. The spray method is used to further remove the attachments on the battery surface, which can reduce the impurity content of the product, improve the product quality of the battery black powder, and reduce the difficulty of subsequent wet recovery and impurity removal.

[0015] In the above-mentioned lithium-ion battery water discharging method, preferably, the step S1 further comprises:

[0016] S11a, if you want to increase the discharge rate, you can use a blade or other insulating materials to break the battery shell, which can increase the discharge rate of the battery;

[0017] If the battery is discharged directly without treatment, the discharge solution can only enter the battery and start discharging after the positive ear is corroded. After the battery casing or other insulating materials are broken, the discharge solution can directly enter the battery cell, and the positive and negative electrodes can quickly contact the discharge solution to start discharging, shortening the discharge time.

[0018] In the above-mentioned lithium-ion battery water discharging method, preferably, the step S3 further comprises:

[0019] S31a, observe whether white crystals are precipitated in the discharge solution;

[0020] S32a, if any, add discharge solution into the discharge box until the white crystals are dissolved.

[0021] When white crystals precipitate in the discharge box, it indicates that the sodium chloride in the discharge solution is oversaturated. Adding an appropriate amount of discharge solution to the discharge box can reduce the concentration of sodium chloride in the discharge solution, dissolve the white crystals, and prevent the precipitated sodium chloride crystals from adhering to the battery.

[0022] In the above-mentioned lithium-ion battery water discharging method, preferably, the step S3 further comprises:

[0023] S31b, monitoring the pH value of the discharge solution;

[0024] S32b, if the pH value is greater than 9, carbon dioxide or acid is added to the discharge solution until the pH value of the discharge solution is 4.5-6.5.

[0025] Monitor the pH value of the discharge solution in real time. When the pH value is alkaline, add carbon dioxide or acid into the discharge solution in time to create a weak acid environment that inhibits the production of aluminum hydroxide, reduces the precipitation of aluminum hydroxide, and reduces the attachment on the battery surface from the source.

[0026] In the above-mentioned lithium-ion battery water discharging method, preferably, the step S3 further comprises:

[0027] S31c, drain the discharge solution in the discharge box every 1 to 3 hours;

[0028] S32c, rinse the batteries through the spray device until the liquid level covers all the batteries again.

[0029] The discharge solution in the discharge box is replaced regularly, and as the discharge solution is discharged, some of the attachments on the battery surface can be taken away by the liquid flow. In addition, the spray device can deeply rinse the attachments on the battery surface while replenishing the discharge solution, increase the effective contact area between the battery and the discharge solution, reduce the accumulation of sediment on the battery surface, and simplify the subsequent powdering and impurity removal process of the battery.

[0030] In addition, the present invention also discloses a lithium-ion battery water-immersion discharge device, which is suitable for the above-mentioned lithium-ion battery water-immersion discharge method, and includes a discharge box, wherein the discharge box is equipped with a spray device for flushing the battery, and the discharge box is connected to a tail gas recovery device for absorbing and storing the reaction gas, and a pH value adjustment device for adjusting the pH value of the discharge solution. The spray device is built into the discharge box, and can flush the attachments on the battery surface while replenishing the discharge solution, thereby reducing the deposition of attachments on the battery surface; the tail gas recovery device can absorb and store the reaction gas generated during the discharge process, thereby preventing environmental pollution and safety hazards caused by direct gas discharge; the pH value adjustment device can monitor the pH value of the discharge solution in real time, and when the pH value is detected to be greater than 9, carbon dioxide or acid is added to the discharge solution in time for neutralization, thereby creating a weak acid environment that inhibits the generation of aluminum hydroxide and reduces the generation of aluminum hydroxide precipitates.

[0031] In the above-mentioned lithium-ion battery water-discharging device, preferably, the discharge box is configured as a double-layer structure, which includes an outer shell for containing a discharge solution, an inner liner detachably installed in the outer shell for containing the battery, and a box cover detachably installed on the opening of the outer shell, the inner liner is configured as a hollow structure, and a sedimentation area for precipitating precipitates is formed between the bottom plate thereof and the bottom plate of the outer shell, the box cover is sealed and connected to the outer shell, and the spray device passes through the box cover.

[0032] The inner tank is detachably installed in the outer shell, which is convenient for placing and removing the battery, and its hollow structure makes it convenient for the precipitates on the surface of the battery to be discharged into the sedimentation area for precipitation after spraying and flushing. The setting of the sedimentation area prevents the precipitates from adhering to the surface of the battery again and affecting the subsequent screening of effective metals. In addition, an observation window for observing the discharge situation can be set on the outer shell, so as to observe the height of the discharge solution in the discharge box, the accumulation of sediments and attachments on the surface of the battery at any time, and then replenish the discharge solution in the discharge box in time to dissolve the sodium chloride crystals, or adjust the replacement time of the discharge solution in the discharge box, increase the frequency of spraying and flushing the battery, and reduce the accumulation of attachments on the surface of the battery.

[0033] In the above-mentioned lithium-ion battery water-discharging device, preferably, the inner tank is provided with a plurality of layers of trays for layeredly supporting the batteries, the trays are arranged in a hollow shape, and the middle of the trays are formed with plug holes for avoiding the spray device.

[0034] The multi-layer tray for supporting batteries can be fixed (in this case, openings need to be left on the inner liner to facilitate the placement and removal of batteries) or detachably set in the inner liner. The design of the multi-layer tray not only increases the battery storage space in the discharge box, but also avoids battery accumulation, increases the contact area between the battery and the discharge solution, and improves the discharge efficiency; at the same time, it also makes it easier for the water column sprayed by the spray device to reach various parts of the battery surface, which is more conducive to the detachment of the attachments on the battery surface. The spray device is set throughout the middle of the tray to ensure that each layer of the tray is set within the coverage area of ​​the spray device, which improves the reliability of the spray system.

[0035] In the above-mentioned lithium-ion battery water-immersion discharge device, preferably, the spray device includes a liquid storage tank and a liquid spray pipe connected thereto, the liquid spray pipe is inserted in a discharge box, and the discharge box is connected to the liquid storage tank to form a closed water circuit.

[0036] The liquid spraying pipe is inserted inside the discharge box, which is beneficial to increase the coverage area of ​​the liquid spraying pipe. The discharge box and the liquid storage tank form a closed water path, which can recycle the discharge solution in the liquid storage tank, reduce the consumption of the discharge solution, and reduce the discharge cost.

[0037] In the above-mentioned lithium-ion battery water discharging device, preferably, the exhaust gas recovery device comprises an exhaust pipe connected to the discharge box, and one end of the exhaust pipe away from the discharge box is connected to an absorption tower or a gas storage tank.

[0038] The hydrogen generated during the discharge process can be stored in a gas tank and then processed centrally or the hydrogen solubility around the box can be reduced through a dissipation system, thereby avoiding the risk of explosion caused by the accumulation of hydrogen in the discharge box. The collected hydrogen generated by the reaction can also be processed in the following ways: first, before the battery is discharged, an inert gas is introduced into the discharge box to remove the oxygen in the discharge box, and then the discharge treatment is carried out to collect the hydrogen generated by the reaction; the hydrogen is used to burn and heat the discharge solution. The introduction of inert gas to exhaust the oxygen in the discharge box can prevent the mixing of oxygen and hydrogen generated by the reaction, thereby reducing the risk of explosion of hydrogen during the combustion and heating process. The hydrogen generated by the reaction is used to heat the discharge solution. On the one hand, it solves the problem of hydrogen treatment. On the other hand, as the temperature of the discharge solution increases, the migration speed of ions in the electrolyte will accelerate, which will increase the ionic conductivity of the solution, accelerate the discharge rate, and reduce the discharge time.

[0039] In the above-mentioned lithium-ion battery water discharging device, preferably, the pH value adjusting device includes a pH value detection element built into the discharge box, and a storage tank connected to the discharge box, and the pH value detection element is connected to an external reading device signal.

[0040] The pH detection element can be used to detect the pH value in the discharge solution. When the pH value of the discharge solution is detected to be greater than 9, the storage tank is opened and carbon dioxide or acid is added to the discharge solution in time until the pH value of the discharge solution is 4.5-6.5. An appropriate amount of carbon dioxide or acid can neutralize the alkaline environment that is conducive to the formation of aluminum hydroxide, thereby inhibiting the formation of aluminum hydroxide.

[0041] Compared with the prior art, the advantages of the present invention are:

[0042] 1. The lithium-ion battery water discharging method and discharging device of the present invention are provided with a tail gas recovery device for absorbing and storing reaction gas, which can collect hydrogen generated during the discharging process, thereby reducing environmental pollution and safety hazards caused by the chemical discharging method.

[0043] 2. The lithium-ion battery water discharging method and discharging device of the present invention adopts a pH value adjusting device to adjust the pH value of the discharging solution and a spraying device to replenish the discharging solution during the discharging process, which effectively solves the precipitation problem of aluminum hydroxide and sodium chloride, reduces the impurity content of the product, improves the product quality of the battery black powder, and reduces the difficulty of subsequent wet recovery and impurity removal at the back end. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 This is a schematic diagram of the structure of the lithium-ion battery water discharging device in Example 1 of the present invention;

[0046] Figure 2 It is a schematic diagram of the structure of the lithium-ion battery water discharging device in Example 2 of the present invention.

[0047] Legend

[0048] 01. Battery; 1. Discharge box; 11. Outer shell; 12. Inner liner; 121. Tray; 13. Box cover; 14. Sedimentation area; 2. Spraying device; 21. Liquid storage tank; 22. Liquid spraying pipeline; 3. Exhaust gas recovery device; 31. Exhaust pipe; 32. Absorption tower; 33. Gas storage tank; 4. pH value adjustment device; 41. pH value detection element; 42. Storage tank; 5. Inert gas storage device; 6. Combustion device. DETAILED DESCRIPTION

[0049] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively and meticulously below in conjunction with the accompanying drawings and preferred embodiments of the present invention, but the protection scope of the present invention is not limited to the following specific embodiments.

[0050] It should be noted that when an element is described as being "fixed, fixed, connected or connected to" another element, it can be directly fixed, fixed, connected or connected to the other element, or it can be indirectly fixed, fixed, connected or connected to the other element through other intermediate connectors.

[0051] Unless otherwise defined, all the professional terms used below have the same meanings as those generally understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention.

[0052] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0053] Embodiment 1:

[0054] The lithium-ion battery water discharging method of this embodiment includes the following steps:

[0055] S1, place the battery 01 into the discharge box 1 and seal the box cover. The specific steps include: opening the box cover 13 of the discharge box 1, taking out the inner liner 12 of the discharge box 1, placing the batteries 01 to be discharged on the tray 121 layer by layer, placing the inner liner 12 into the discharge box 1, and sealing the box cover 13.

[0056] S2, injecting discharge solution into the discharge box 1 until the liquid level covers all the batteries 01 and exceeds the top surface of the battery 01 at the highest layer by 10 to 20 cm. The specific steps include: turning on the spray device 2, injecting the discharge solution into the discharge box 1 through the spray pipe 22 until the liquid level covers all the batteries 01 and exceeds the top surface of the battery 01 at the highest layer by 10 to 20 cm, and stopping the injection of the discharge solution.

[0057] S3, collects tail gas, dissolves precipitated sodium chloride crystals, inhibits the generation of aluminum hydroxide, and sprays to remove attachments on the surface of battery 01.

[0058] S4, after the discharge is completed, the battery 01 is taken out from the discharge box 1. The specific steps include: opening the box cover 13 of the discharge box 1, taking out the inner container 12 of the discharge box 1, and taking out the battery 01 placed on the tray 121 layer by layer.

[0059] Among them, the discharge solution is a 5%-15% saturated concentration sodium chloride solution.

[0060] In this embodiment, step S3 further includes:

[0061] S31a, observe whether white crystals are precipitated in the discharge solution;

[0062] S32a, if any, add discharge solution into the discharge box 1 until the white crystals are dissolved.

[0063] The specific steps include: when white crystals are precipitated in the discharge box 1, the spray device 2 is opened in time to add the discharge solution into the discharge box 1 until the precipitated sodium chloride crystals are completely dissolved.

[0064] In this embodiment, step S3 further includes:

[0065] S31b, monitoring the pH value of the discharge solution;

[0066] S32b, if the pH value is greater than 9, carbon dioxide or acid is added to the discharge solution until the pH value of the discharge solution is 4.5-6.5.

[0067] The specific steps include: using the pH detection element 41 to monitor the pH value of the discharge solution in the discharge box 1, when the pH value is greater than 9, introducing carbon dioxide or acid into the discharge box 1 through the storage tank 42 to stabilize the pH value of the solution in the discharge box 1 at 4.5-6.5, thereby inhibiting the generation of aluminum hydroxide precipitates.

[0068] In this embodiment, step S3 further includes:

[0069] S31c, draining the discharge solution in the discharge box 1 every 2 hours;

[0070] S32c, flushing the batteries 01 through the spray device 2 until the liquid level covers all the batteries 01 again.

[0071] like Figure 1 As shown, the lithium-ion battery water discharging device of this embodiment is suitable for the above-mentioned lithium-ion battery water discharging method, which includes a discharge box 1, the discharge box 1 has a built-in spray device 2 for flushing the battery 01, and the discharge box 1 is connected to a tail gas recovery device 3 for absorbing and storing reaction gas, and a pH value adjusting device 4 for adjusting the pH value of the discharge solution.

[0072] In this embodiment, the discharge box 1 is configured as a double-layer structure, which includes an outer shell 11 for containing a discharge solution, an inner tank 12 detachably installed in the outer shell 11 and used to contain the battery 01, and a box cover 13 detachably covered at the opening of the outer shell 11. The inner tank 12 is configured as a hollow structure, and a sedimentation area 14 for precipitating precipitates is formed between its bottom plate and the bottom plate of the outer shell 11. The box cover 13 is sealed and connected to the outer shell 11, and the spray device 2 passes through the box cover 13.

[0073] In this embodiment, a plurality of trays 121 for supporting the batteries 01 in layers are provided in the inner liner 12 . The trays 121 are configured to be hollow, and holes for avoiding the spray device 2 are formed in the middle of the trays 121 .

[0074] In this embodiment, the spray device 2 includes a liquid storage tank 21 and a liquid spraying pipe 22 connected thereto. The liquid spraying pipe 22 is inserted into the discharge box 1, and the discharge box 1 is connected to the liquid storage tank 21 to form a closed water path.

[0075] In this embodiment, the tail gas recovery device 3 includes an exhaust pipe 31 connected to the discharge box 1 , and one end of the exhaust pipe 31 away from the discharge box 1 is connected to an absorption tower 32 or a gas storage tank 33 .

[0076] In this embodiment, the pH value adjusting device 4 includes a pH value detecting element 41 built in the discharge box 1 and a storage tank 42 connected to the discharge box 1 . The pH value detecting element 41 is connected to an external reading device signal.

[0077] In this embodiment, the discharge process is as follows: open the cover 13 of the discharge box 1, take out the inner liner 12 of the discharge box 1, place the battery 01 to be discharged on the tray 121, put the inner liner 12 into the discharge box 1, and seal the cover 13; inject the discharge solution into the discharge box 1 through the spray device 2 until the liquid level covers all the batteries 01; stop injecting the discharge solution and start discharging; synchronously start the tail gas recovery device 3 to collect the reaction gas generated during the entire discharge process; observe whether white crystals are precipitated in the discharge solution, and if so, open the spray device 2 to add an appropriate amount of water-soluble precipitated sodium chloride crystals; use the pH detection element Component 41 monitors the pH value of the discharge solution in the discharge box 1. When the pH value is greater than 9, carbon dioxide or acid is introduced into the discharge box 1 through the storage tank 42 to stabilize the pH value of the solution in the discharge box 1 at 4.5-6.5, thereby inhibiting the generation of aluminum hydroxide precipitates. Every 2 hours, the discharge solution in the discharge box 1 is drained and the batteries 01 are rinsed through the spray device 2 until the liquid level covers all the batteries 01 again. The above operation is repeated until the discharge is completed. After the discharge is completed, the spray device 2 is opened to rinse the surface of the batteries 01, the cover 13 of the discharge box 1 is opened, the inner tank 12 of the discharge box 1 is taken out, and the batteries 01 placed on the tray 121 are removed layer by layer.

[0078] Embodiment 2:

[0079] The lithium ion battery water discharge device in this embodiment is as follows Figure 2 As shown, it is basically the same as the lithium ion battery water discharging device in Example 1, except that:

[0080] A combustion device 6 for heating the liquid storage tank 21 is provided, and the combustion device 6 is connected to the gas storage tank 33; at the same time, an inert gas storage device 5 is also provided which is connected to the discharge box 1, and an exhaust valve is provided on the discharge box 1. The lithium ion battery water discharge device in this embodiment can use the hydrogen generated in the battery discharge reaction as fuel to heat the discharge solution in the liquid storage tank 21, thereby increasing the reaction rate of the battery discharge.

[0081] In this embodiment, the method for discharging the lithium-ion battery by soaking in water is basically the same as that in Embodiment 1, except that:

[0082] After step S1 and before step S2, the inert gas storage device 5 is first connected to the discharge box 1, and the oxygen in the discharge box 1 is basically discharged by using the inert gas.

[0083] Furthermore, during the battery discharge process, the hydrogen collected by the tail gas recovery device 3 is burned by the combustion device 6 to heat the discharge solution (the temperature of the discharge solution is 45-60° C.).

Claims

1. A method for discharging a lithium-ion battery by soaking it in water, characterized in that: The following steps are involved: S1, place the battery into the discharge box and seal the box cover; S2, inject the discharge solution into the discharge box until the liquid level covers all the batteries; S3, collects tail gas, dissolves precipitated sodium chloride crystals, inhibits the generation of aluminum hydroxide, and sprays to remove attachments on the battery surface; S4, after the discharge is completed, take the battery out of the discharge box; The step S3 further comprises: S31a, observe whether white crystals are precipitated in the discharge solution; S32a, if any, add discharge solution into the discharge box until the white crystals are dissolved; The step S3 further comprises: S31b, monitoring the pH value of the discharge solution; S32b, if the pH value is greater than 9, adding carbon dioxide or acid to the discharge solution until the pH value of the discharge solution is 4.5-6.5; The step S3 further comprises: S31c, drain the discharge solution in the discharge box every 1 to 3 hours; S32c, rinse the batteries through the spray device until the liquid level covers all the batteries again.

2. A lithium-ion battery water discharge device, characterized in that: The method for discharging a lithium-ion battery by soaking in water as claimed in claim 1 comprises a discharge box (1), wherein the discharge box (1) is provided with a spray device (2) for flushing the battery (01), and the discharge box (1) is connected to an exhaust gas recovery device (3) for absorbing and storing reaction gas, and a pH value adjustment device (4) for adjusting the pH value of the discharge solution.

3. The lithium-ion battery water discharging device according to claim 2, characterized in that: The discharge box (1) is configured as a double-layer structure, comprising an outer shell (11) for containing a discharge solution, an inner liner (12) detachably mounted in the outer shell (11) and for containing a battery (01), and a box cover (13) detachably mounted on an opening of the outer shell (11); the inner liner (12) is configured as a hollow structure, and a sedimentation area (14) for precipitating precipitates is formed between the bottom plate of the inner liner and the bottom plate of the outer shell (11); the box cover (13) is sealedly connected to the outer shell (11), and the spray device (2) passes through the box cover (13).

4. The lithium-ion battery water discharging device according to claim 3, characterized in that: The inner container (12) is provided with a plurality of trays (121) for supporting the batteries (01) in layers, the trays (121) are arranged in a hollow shape, and a socket for avoiding the spray device (2) is formed in the middle of the trays (121).

5. The lithium-ion battery water discharging device according to claim 2, characterized in that: The spray device (2) comprises a liquid storage tank (21) and a liquid spray pipe (22) connected thereto, the liquid spray pipe (22) is inserted into the discharge box (1), and the discharge box (1) is connected to the liquid storage tank (21) to form a closed water path.

6. The lithium-ion battery water discharging device according to claim 2, characterized in that: The tail gas recovery device (3) comprises an exhaust pipe (31) connected to the discharge box (1), and one end of the exhaust pipe (31) facing away from the discharge box (1) is connected to an absorption tower (32) or a gas storage tank (33).

7. The lithium-ion battery water discharging device according to claim 2, characterized in that: The pH value adjusting device (4) comprises a pH value detecting element (41) built into the discharge box (1), and a storage tank (42) connected to the discharge box (1); the pH value detecting element (41) is connected to an external reading device signal.

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