A kind of safe discharge method of spent lithium-ion battery

Abstract

The invention provides a safe discharge method for waste lithium-ion batteries. The safe discharge method is to mix waste lithium-ion batteries and conductive particles in a discharge frame so that the waste lithium-ion batteries are discharged. Calculate the internal resistance of the discharge frame in real time, calculate the discharge rate based on the voltage and rated capacity of the waste lithium-ion battery, and dynamically adjust the pressurization pressure to maintain the discharge rate of the waste lithium-ion battery at 0.1-3C; at the same time, monitor the inside of the discharge frame in real time temperature, when the internal temperature is higher than the warning temperature, the pressurized pressure will drop to 40% to 80% of the original pressure; Reduce to 10% to 40% of the original pressure, re-pressurize and discharge until the discharge is completed. The safe discharge method of the invention is simple in operation, fast in discharge speed, environmentally friendly and pollution-free, and can realize industrial scale production.

Description

technical field [0001] The invention belongs to the technical field of recycling and pretreatment of waste lithium ion batteries, and in particular relates to a safe discharge method for waste lithium ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, no memory effect and excellent electrical performance, and have been widely used in electronic products, new energy vehicles, energy storage and other fields. By the end of 2019, my country had promoted a total of 3.81 million new energy vehicles. The service life of lithium-ion batteries is generally 3 to 8 years. At present, lithium-ion batteries are gradually entering the large-scale decommissioning period, and the recycling and disposal of lithium-ion batteries is imminent. [0003] At present, the recycling methods of waste lithium-ion batteries in my country are mainly dismantling, crushing, sorting, and element extraction processes to realize the recycling and ...

AI Technical Summary

Problems solved by technology

Resistive load discharge patents, such as CN108550943A, CN106207297B, although this method has a faster discharge speed and a more thorough discharge, it also has problems such as elevated temperature during the discharge process, poor compatibility of battery types, and low degree of automatic operation of load connection.

Conductive powder discharge patents, such as CN106816663A, CN109103534A, CN110176644A, all use conductive carbon powder or graphite powder as the conductive medium for discharge. The advantage of this method is that it is suitable for most battery types, does not produce three wastes during the discharge process, and is easy to operate. However, the contact between the conductive powder is poor, the contact resistance is large, and the discharge is slow. At the same time, the conductive powder is easy to raise dust and pollute the environment during the loading and unloading process. The conductive powder is also easy to adhere to the battery surface during the discharge process, polluting the battery.

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