Patent ID: 8779723

Claim:
A battery charge/discharge control apparatus for a vehicle capable of driving an electric motor by means of a battery, the apparatus comprising: a temperature detecting section for detecting temperature of the battery; a temperature history distribution calculating section for calculating temperature history distribution of the battery since the temperature detecting section starts to detect the temperature; a lifetime workload calculating section for calculating a lifetime workload of the battery on the basis of the temperature history distribution of the battery calculated by the temperature history distribution calculating section; a travel distance detecting section for detecting a travel distance of the vehicle; a workload increase rate permissible value calculating section for calculating a permissible value of a workload increase rate on the basis of a lifetime workload of the battery calculated by the lifetime workload calculating section and the travel distance detected by the travel distance detecting section, the permissible value indicating a workload to increase per unit distance; an actual workload increase rate calculating section for calculating an actual workload increase rate of the battery; a comparing section for comparing the permissible value of the workload increase rate calculated by the workload increase rate permissible value calculating section with the actual workload increase rate of the battery calculated by the actual workload increase rate calculating section; and a battery output restricting section for further restricting the output from the output of the battery restricted in a normal driving mode if necessary by a restricted value based upon a difference between the actual workload increase rate and the permissible value of the workload increase rate in the case where the comparing section determines that the actual workload increase rate is larger than the permissible value of the workload increase rate.