CONTROL DEVICE FOR SECONDARY BATTERY, CONTROL PROGRAM ACCORDING TO CONTROL DEVICE FOR SECONDARY BATTERY, AND CONTROL METHOD ACCORDING TO CONTROL DEVICE FOR SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To increase a charging speed of a secondary battery in a low-temperature range while preventing deterioration of the secondary battery even when the charging rate in the low-temperature range is set lower than the other temperature range.SOLUTION: A system control device 12 includes a function for setting, in a low-temperature range where a degree of deterioration of a secondary battery 20 caused by charging is greater than the other temperature range, a low-temperature range limit value that is a limit value of a charging rate, lower than a limit value in the other temperature range. The system control device 12 sets either a normal rate mode during which the limit value is defined as the low-temperature range limit value, or an over-charging rate mode during which the limit value is made higher than the low-temperature range limit value, for charging in the low-temperature range. On the basis of a parameter correlated with a deterioration state of the secondary battery 20, it is determined whether charging can be performed under the over-charging rate mode.