| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a secondary battery having a constant-voltage element for protecting the battery from overcharge. <P>SOLUTION: A breakdown voltage of the constant-voltage element is lower than the explosion or ignition voltage of the battery, so that discharge may occur before the battery is exploded or ignited even if the voltage of the secondary battery rises above an overcharge voltage. Accordingly, the battery can be protected from explosion or ignition. An amount of a leakage current at a full charge voltage of the battery is less than 0.05% of a battery capacity value, or the breakdown voltage of the constant-voltage element is higher than the full charge voltage of the secondary battery. Thus, the constant-voltage element rarely generates the leakage current even if the battery is charged up to the full charge voltage in charging. <P>COPYRIGHT: (C)2012,JPO&INPIT |
