| 摘要 |
<p>PURPOSE:To obtain a diaphragm for battery, which has the excellent shut-down function without generating the perfect melting and the crack due to the melting at the time of shut-down, by using a laminated structure of polyolefine porous material and fluororesin porous material. CONSTITUTION:A laminated structure of a polyolefine porous material and a fluororesin porous material is used for a diaphragm for battery. In this diaphragm, in the case where the heating due to the external short circuit is generated, when the temperature arrives near the melting point of the polyolefine, polyolefine is melted to generate the blinding of an opening part of the porous material, and the current is shut down. On the other hand, since the fluororesin porous material is not melted at the melting temperature of the polyolefine porous material and works as a support material, progress of the shrinkage and the generation of crack at the time of melting of the polyolefine porous material can be restricted. Consequently, a diaphragm for battery, which has the excellent shut-down function and a high safety without generating the perfect melting and the crack due to the melting at the time of shut-down, can be obtained.</p> |
