| 摘要 |
PROBLEM TO BE SOLVED: To prevent an electrolyte from leaking outside by providing an assembled sealing plate with a filter connected to one electrode through a lead plate, a sub-filter coming into surface contact with the filter, a valve body formed of a metal thin plate to be ruptured by a predetermined pressure, a valve body rupturing ring, and a flexible wiring board on which a safety circuit electrically connected to the filter is mounted. SOLUTION: A cylindrical lithium battery has a filter 48, a sub-filter 49, a valve body 47, and a valve body rupturing ring 46. Explosion-proofing slits G are formed in the valve body 47, which is welded to the filter 48. An electrolyte gasified by heat generation pushes up the valve body 47 toward a safety circuit side through holes H of the filter 48. At that time, the pressure of the gas ruptures the slits G formed in the valve body 47, and thereby, the gas is released outside through a hole E formed in the safety circuit, holes I formed in the controlled positive input and output, and holes J formed in a safety circuit-use negative electrode, so that an explosion-proof measure is accomplished. |
