| 摘要 |
The present invention provides a method of measuring an intrinsic resistance of a battery at a low rate discharge and an apparatus of the same. A method of measuring an intrinsic resistance of a battery includes the steps of: measuring periodically a discharge current and a terminal voltage responding to the discharge current at a low rate discharge of the battery; determining a first approximate expression of the terminal voltage with respect to the increasing discharge current and a second approximate expression of the terminal voltage with respect to the decreasing discharge current based on the measured discharge current and terminal voltage; defining a range of the intrinsic resistance based on the first and second approximate expressions; assuming a resistance in the range of the intrinsic resistance as a tentative intrinsic resistance; determining a tentative maximum polarization time from the second approximate expression and the tentative intrinsic resistance; and determining the intrinsic resistance from two relational expressions including the intrinsic resistance, an intrinsic maximum polarization time and the tentative maximum polarization time.
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