| 摘要 |
A method of operating a rechargeable battery having a nickel hydroxide positive electrode and an electrolyte comprises the steps of charging the battery, after completion of a discharge cycle, at a temperature T1 between approximately -10° C. and -30° C. which is lower than a temperature T2, in the range of approximately -15° C. to +5° C., at which discharge begins, automatically determining the total charge to be returned to the battery for establishing the ideal charge for the battery leading into the next discharge cycle, and applying charge energy to the battery having the magnitude as automatically determined. After completion of the discharge cycle, the battery is cooled to the temperature in the T1 range, then heated to stabilize the temperature to that in the T1 range. Then the battery is charged according to a nominal profile of charge power as a function of time, the accumulated charge imparted to the battery sensed as cooling proceeds, the nominal power profile adjusted according to the accumulated charge obtained, and the remainder of the nominal charge profile adjusted accordingly. More specifically, the battery is heated to maintain a nominal temperature profile as a function of time associated with an upward transition in heater power for initializing the heating operation, a plateau in heater power for maintaining the temperature setpoint and a downward transition in heater power before the battery begins to warm and the actual downward transition in heater power obtained is sensed, and the nominal power profile is adjusted according to the time of the actual downward transition sensed. This results in decreasing the duration charge returned in the event the downward transition operation sensed actually occurs prior to the nominal transition time and results in increasing the charge returned in the event the downward transition operation sensed actually occurs after the nominal transition time operation.
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