| 摘要 |
PROBLEM TO BE SOLVED: To provide the remaining capacity measuring method of a lithium battery for accurately measuring the remaining capacity by the use of a lithium diffusion model within an electrode of the lithium battery. SOLUTION: A regression curve (E=Eo+αI) with respect to a current I in the voltage sum (E+Vd) of a terminal voltage E and lithium ion diffusion concentration gradient Vd is determined to a plurality of currents I and voltages E within a given time in a lithium battery, and the voltage sum (E+Vd) in current I=0 is calculated, based on the regression curve as the open circuit voltage Eo. The current dependence of the electromotive force of the lithium ion battery is corrected by the diffusion concentration gradient Vd, and the open circuit voltage Eo is calculated. As a result, even if the current I is large, the calculation error of the open circuit voltage Eo is minimized. |
