| 摘要 |
<p>When a battery current (Ib) is not larger than a limit current (|Ijd|) set depending on the battery temperature (Tb) and is flowing continuously for a predetermined time set depending on the battery temperature (Tb) or longer, a decision is made that a secondary battery (10) is in stable state. When the secondary battery (10) is in stabilized state, the battery voltage (Vb) is considered to be equal to the open circuit voltage (OCV) and SOC estimation is performed based on the open circuit voltage-SOC characteristics. When the product of the internal resistance of the secondary battery and the limit current (|Ijd|) is made substantially constant (constant voltage) by setting the limit current (|Ijd|) in association with temperature dependence of the internal resistance, estimation error can be kept within a predetermined range in the stabilized state even if SOC estimation is performed while the battery voltage (Vb) is assumed as the open circuit voltage (OCV). Consequently, SOC can be estimated with high precision within a predetermined error by a simple and reliable system under stabilized state.</p> |
