| 摘要 |
PROBLEM TO BE SOLVED: To provide a device and method of battery capacity calculation which can calculate battery capacity with a high degree of accuracy.SOLUTION: In the method, variation in current integration charging rate ΔSOC-i is computed based on integrated values of sensor current I during a specific current integration period in charging time period of a battery 6 charged by a charger; open circuit voltage OCV at the starting and ending of the specific current integration period is estimated based on state quantity of the battery 6; charging rates SOC-v1/SOC-v2 at the starting and ending of the specific current integration period are obtained from the estimated circuit voltage OCV; variation in open circuit voltage charging rate ΔSOC-v is computed from difference between both of the SOC-v1/SOC-v2, capacity maintenance ratio SOH, that is, ratio of the variation in current integration charging rate ΔSOC-i to the variation in open circuit voltage charging rate ΔSOC-v is computed, and then initial battery capacity Ah of the battery 6 is multiplied by the capacity maintenance ratio SOH to calculate battery capacity Ch of the battery 6. |
