| 摘要 |
<p>A correlation between four variables - open circuit voltage or discharge voltage, internal resistance, temperature and discharge current of a secondary battery and the residual capacity of the secondary battery is recognized in advance, and a contour map representing, for example, two variables and a residual capacity is prepared. Then, at least two variables out of the above four variables of a secondary battery in use are detected and checked against the above correlation to thereby detect the residual capacity of the secondary battery.</p> |
