Environment-friendly safe discharging method for waste lithium ion battery

Abstract

The invention provides a green and environment-friendly safe discharging method for a waste lithium ion battery. The method comprises the following steps: uniformly mixing graphite, a binder and an additive in proportion to prepare discharging particles; the waste lithium ion batteries and the discharge particles are placed in a net-shaped tray arranged in a cavity, the tray is connected with a vibration pressurizing device, the vibration pressurizing device drives the tray to vibrate, the waste lithium ion batteries and the discharge particles in the tray are gradually pressurized, when the set pressure value is reached, vibration is stopped, and the waste lithium ion batteries and the discharge particles are discharged. Allowing the waste lithium ion battery and the discharge particles to stand at a low temperature, releasing the pressure to discharge the discharge particles, mixing the waste lithium ion battery and the discharge particles again, vibrating, pressurizing, standing, and releasing the pressure to obtain the discharged waste lithium ion battery. According to the invention, all the waste lithium ion batteries can be tightly connected with the discharge particles, uniform and thorough discharge of all the batteries can be ensured, the temperature of the waste lithium ion batteries during discharge can be reduced, the discharge safety is ensured, and thorough discharge can be ensured by multiple standing treatment.

Description

technical field [0001] The invention belongs to the technical field of recycling of waste lithium ion batteries, and in particular relates to a method for safe discharging of waste lithium ion batteries. Background technique [0002] Since 2014, my country's new energy vehicles have developed rapidly, and the production and sales have shown a rapid growth trend. In 2019, the production and sales of new energy vehicles in my country were 1.242 million and 1.206 million. In August 2021, the installed capacity of power batteries in my country was 12.6GWh, an increase of 144.9% year-on-year and an increase of 11.2% month-on-month. Among them, the total loading of ternary batteries was 5.3GWh, a year-on-year increase of 51.9% and a month-on-month decrease of 2.1%. The total loading of lithium iron phosphate batteries was 7.2GWh, a year-on-year increase of 361.8% and a month-on-month increase of 24.4%. However, lithium-ion batteries will also gradually enter the stage of large-sc...

AI Technical Summary

Problems solved by technology

Although salt water discharge has many advantages, the mainstream process of salt water produces a large amount of harmful waste gas, waste liquid, waste residue and other three wastes. The waste gas is mainly a large amount of hydrogen, chlorine and other waste gas generated by salt water discharge. Hydrogen gas has a risk of explosion, and chlorine gas has a strong pungent smell. Highly toxic gas; salt water discharge is also easy to cause the electrolyte inside the battery to overflow, and waste liquid will be left after discharge, which is hazardous waste, difficult to handle and high cost; moreover, solid waste residue will be left after salt water discharge; at the same time, salt water discharge is easy to corrode the battery The casing, explosion-proof valve and internal pole pieces cause difficulties for subsequent physical separation and wet recovery; and the discharge efficiency of salt water is low, and the discharge cycle is 3-5 days, and the discharge effect cannot be guaranteed