| 摘要 |
PURPOSE: A cell internal resistance measuring method is provided to recognize the degradation state of a battery by measuring internal resistance. CONSTITUTION: A current and voltage of a battery cell are measured(305). It is determined whether measurement time have passed about 1 minute(310). When the measured current-voltage data satisfies a fixed electric current distribution, a resistance computation process is continued. If not, the resistance computation process is completed(315). When a battery satisfies a temperature condition, the resistance computation process is continued. If not, the resistance computation process is completed(320). The battery resistance is measured by using a least square method(325). |
