Method, circuit and system for discharging a battery

Abstract

The invention relates to a battery discharging method, circuit and system. The method includes: comparing the voltage of the battery with a first set voltage and a second set voltage respectively, the second set voltage being smaller than the first set voltage; when the battery voltage is greater than the first set voltage When the voltage is set, the battery is connected to the first discharge branch for discharge; when the voltage of the battery is less than or equal to the first set voltage, and the voltage of the battery is greater than the second set voltage voltage, connect the battery to the second discharge branch for discharge, the discharge current of the second discharge branch is less than the discharge current of the first discharge branch; when the voltage of the battery is less than or equal to the At the second set voltage, the battery is simultaneously connected to the first discharge branch and the second discharge branch for discharging. The invention can realize that the voltage of the battery will not recover within 40 minutes to 60 minutes, and the 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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