| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of estimating in high precision the state of charge by measuring an internal pressure of the battery and the battery temperature when charging and using the measured value. SOLUTION: A battery module includes a battery laminate in which a plurality of unit batteries constituted as a secondary battery are mutually electrically connected and the interior is mutually communicated through a communicating member, a pressure measuring device to measure the internal pressure of the battery laminate, and a temperature measuring device to measure the battery temperature of the battery laminate. When the battery module is charged by a prescribed electrical charging condition, correlation characteristics of the internal pressure and battery temperature and the state of charge of the battery laminate are prepared beforehand, and by comparing the internal pressure measured-value measured by the pressure measuring device and the battery temperature measured-value measured by the temperature measuring device with the correlation characteristics, the state of charge is calculated. COPYRIGHT: (C)2010,JPO&INPIT |
