| 摘要 |
PROBLEM TO BE SOLVED: To provide a sealed secondary battery excellent in a steady-state sealing property and equipped with a safety valve capable of securing a constant sealing performance even after operation of the valve due to abnormal inner pressure. SOLUTION: In the secondary battery 10, an electrode group 25 and electrolyte solution are sealed in a battery container 20. A first safety valve 30 and a second safety valve 40 are arranged in series in correspondence with the same position of the battery container 20. The first safety valve 30 is provided as a destructive irreversible valve, and is destroyed when an inner pressure reaches beyond a given valve-opening pressure to form a pressure-releasing channel. The second safety valve 40 is provided as a non-destructive reversible valve, and opens to form a pressure-releasing channel at impression of pressure exceeding the given valve-opening pressure, on the other hand, closes when the pressure returns below the valve-opening pressure, and the sealing performance is resumed. COPYRIGHT: (C)2006,JPO&NCIPI
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