| 摘要 |
<p>A thin battery in which safety is assured by cutting off the electrical connection when the internal pressure of the battery rises. An upper valve and lower valve are arranged with an electrically insulating gasket in between. Part of the upper valve is recessed and, at the same time, a small hole and a thin-wall section connected to the small hole are provided in part of the lower valve. The strength of the lower valve is made higher than that of the upper valve by welding the part of the lower value surrounded by the small hole and the thin-wall section to the bottom face of the recessed section of the upper valve.</p> |
