Battery discharging method, circuit and system

Abstract

The invention relates to a battery discharging method, circuit and system. The method comprises the steps of respectively comparing a battery voltage with a first setting voltage and a second settingvoltage, wherein the second setting voltage is smaller than the first setting voltage; connecting the battery to a first discharging branch for discharging when the battery voltage is larger than thefirst setting voltage; connecting the battery to a second discharging branch for discharging when the battery voltage is smaller than or equal to the first setting voltage and the battery voltage is larger than the second setting voltage, wherein a discharging current of the second discharging branch is smaller than a discharging current of the first discharging branch; and simultaneously connecting the battery to the first discharging branch and the second discharging branch for discharging when the voltage of the battery is smaller than or equal to the second setting voltage. By the method,the battery voltage cannot be recovered within 40 minutes or 60 minutes, and a battery can be safely disassembled within one hour.

Description

technical field [0001] The invention relates to the field of battery recycling, in particular to a battery discharging method, circuit and system. Background technique [0002] With the country's promotion and support for new energy vehicles, electric vehicles have entered a period of rapid development, and the demand for lithium batteries for vehicles has been increasing year by year. However, the service life of lithium batteries is limited, and the number of decommissioned lithium batteries will also usher in a climax. Discarded lithium batteries will pollute the environment, and lithium batteries contain scarce metal resources in my country, so retired lithium batteries are usually recycled. [0003] Before lithium battery recycling, it is necessary to discharge the remaining power (i.e., residual power) of the lithium battery below the safe voltage, so as to avoid dangerous situations such as fire and explosion during the dismantling process of the lithium battery, and...

AI Technical Summary

Problems solved by technology

At present, lithium batteries are mainly discharged by immersing them in chemical solutions such as sodium hydroxide and sodium chloride. The whole process takes 12 to 16 hours, which takes a long time and has low efficiency.

If the remaining power of the lithium battery is directly consumed by electrical equipment, although the time-consuming is short, the voltage of the lithium battery is easy to recover, and the discharge effect cannot be guaranteed.

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