| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To detect a temporary characteristics change easily and in a high precision by reflecting an internal mass transfer speed of a battery. <P>SOLUTION: A voltage rectangular wave is impressed on a secondary battery 40 and based on a responding current at the time, an electrochemical parameter which reflects an internal mass transfer speed is calculated and, for example, is compared with an electrochemical parameter or the like of the battery in a standard status when a characteristics change is not brought about, and if a comparison result is less than a predetermined threshold value, the electrochemical parameter is a numerical value reflecting a diffusion factor, and as an example, a charging load Qf, a discharging load Qr, which are able to be calculated from the responding current at a time of impressing the voltage rectangular wave, can be taken up. The electrochemical parameter reflecting the diffusion factor changes by a temporary characteristics change such as a memory effect or the like and returns to the normal value when the temporary change is over, and as a result, if the parameter is taken up, the characteristic change can be detected easily in a high precision and in a short time. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
