Method, circuit and system for discharging power storage battery

The invention discloses a method for discharging a power storage battery, which is applied to a power storage battery discharging circuit and comprises the steps of obtaining a current discharge current value of the power storage battery, and comparing the current discharge current value with a preset current value; if the current discharge current value is equal to the preset current value, obtaining a current discharge voltage value of the power storage battery, and comparing the current discharge voltage value with a preset cut-off voltage value; if the current discharge voltage value is equal to or less than the preset cut-off voltage value, stopping discharging the power storage battery. According to the invention, the discharging state of the power storage battery in the dischargingprocess is controlled according to the preset current value and the preset cut-off voltage value so as to achieve constant discharging of the power storage battery. Compared with the prior art, the method reduces the workload