CONTROL DEVICE AND CONTROL METHOD FOR NONAQUEOUS SECONDARY BATTERY

摘要

A control device that controls discharge of a nonaqueous secondary battery in order that discharge electric power of the nonaqueous secondary battery does not exceed an upper limit value includes a current sensor and a controller. The controller calculates an evaluation value for evaluating a first deterioration component based on a discharge state detected by using the current sensor. The first deterioration component is a component that reduces output performance of the nonaqueous secondary battery due to an imbalance of ion concentrations in an electrolytic solution caused by discharging the nonaqueous secondary battery. The controller integrates a value obtained by subtracting a correction coefficient from a first integrated value obtained by integrating the evaluation values in past, which exceed a target value, and the evaluation value at present, which exceeds the target value, to calculate a second integrated value. When the second integrated value exceeds a threshold value, the controller reduces the upper limit value.

主权项

1. A control device configured to control discharge of a nonaqueous secondary battery so that discharge electric power of the nonaqueous secondary battery does not exceed an upper limit value, the control device comprising:
a current sensor configured to detect a current value at a time of charging and discharging the nonaqueous secondary battery; and a controller configured to calculate evaluation values for evaluating a first deterioration component based on a discharge state detected by using the current sensor, and to reduce the upper limit value when a value, obtained by integrating exceeding values of the evaluation values, exceeds a threshold value, the first deterioration component reducing output performance of the nonaqueous secondary battery due to an imbalance of ion concentrations in an electrolyte caused by discharging the nonaqueous secondary battery, the exceeding values of the evaluation values exceeding a target value, wherein the controller is configured to determine whether or not a second integrated value exceeds the threshold value, the second integrated value being obtained by integrating a present evaluation value of the evaluation values and a value obtained by reducing a first integrated value with a correction coefficient, the first integrated value obtained by integrating past evaluation values of the evaluation values, the present evaluation value is a value exceeding the target value at present, and the past evaluation values are values exceeding the target value in past.