Discharge method of waste lithium ion battery

Abstract

The invention provides a discharge method of a waste lithium ion battery. The waste lithium ion battery is placed in a waste lithium ion battery storage area in an insulated immersion basket, sinks into a discharge soaking tank, an organic acid salt buffer solution is put into the alkali liquor in the alkali liquor storage tank communicating with the discharge immersion tank to obtain the waste lithium ion battery discharge scouring liquid, and then the scouring liquid is pumped into a discharge immersion tank to immerse the insulated immersion basket, the waste lithium ion battery is discharged, a circulating pump respectively communicating with the discharge soaking tank and the alkaline solution storage tank is controlled, so that the alkaline solution circulates to scour the waste lithium ion battery, When the remaining electric quantity is equal to or less than the preset electric quantity, the circulating pump is closed, and the discharge scouring liquid of the waste lithium ionbattery is pumped back into the alkali storage tank, and the insulation immersion basket is lifted out of the discharge immersion tank, so that the discharge is completed. Thus, that waste lithium ionbattery can be discharged more thoroughly, the safety performance of the discharge process is better, the battery can be kept intact and not corroded, and further recycling and utilization are facilitated.

Description

Technical field [0001] The present invention relates to the field of lithium ion battery recycling, in particular to a method for discharging waste lithium ion batteries. Background technique [0002] Today, most electronic devices such as smart phones, tablet computers, wearable devices, and electric cars use rechargeable lithium-ion batteries. However, when these lithium-ion batteries are used for two to three years, their functions and efficiency will deteriorate, and their life will even end. Once the electrolyte of the used lithium ion battery flows into the soil or leaks into the environment, there will be great pollution. Therefore, the recycling of the used lithium ion battery is of very important significance. [0003] The recycling of used lithium-ion batteries must first be discharged, because if they are charged for disassembly or cutting operations, it is easy to catch fire or even explode. At present, the discharge of spent lithium-ion batteries mostly uses salt wat...

AI Technical Summary

Problems solved by technology

[0003] The waste lithium-ion battery must first be discharged, because if it is charged for disassembly or cutting, it is easy to catch fire or even explode.

At present, the discharge of waste lithium-ion batteries is mostly carried out in salt water, such as sodium chloride, potassium chloride or sodium sulfate solution, but the use of salt water discharge will cause serious corrosion to the electrodes of the battery, and the electrolyte will leak, which will eventually lead to subsequent failures. Environmentally friendly and safe recycling of lithium-ion batteries; some people use solid powder conductive media, such as graphite powder and metal powder, to discharge waste lithium-ion batteries, but this method will cause the battery to overheat or even explode, and this method is not suitable for discharging. Thoroughly; some people also use the method of directly drilling the lithium-ion battery to penetrate the positive and negative electrodes, and directly short-circuit discharge. This method discharges quickly, but the safety is poor; some people also use the freezing method to put the lithium-ion battery into liquid nitrogen. Discharge, this method discharges thoroughly and is safe, but the cost is too high and it is not suitable for large-scale discharge treatment of waste lithium-ion batteries

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