| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a sealed battery case capable of sealing a battery stably for a long time. <P>SOLUTION: A sealed battery case has a sealing part for sealing a main body part by thermal fusion so as to store a power generation element inside, and the sealing part is made of a polyarylene sulfide-based resin with a residual ion concentration of 110 ppm or less by quantity reference. In the prior art, corrosion occurs at a juncture between the polyarylene sulfide-based resin and a metal component. Through the investigation of the cause of the corrosion, it is found that there is a problem with the action of residual ion included in the polyarylene sulfide-based resin and the problem can be solved by reducing the residual ion concentration. As a manufacturing method for the polyarylene sulfide-based resin commercially distributed, a polymerization method using sodium salt has been adopted as a practical method, and residual ion such as sodium ion is included at hundreds of ppm or more although the sodium ion is removed to some degree. <P>COPYRIGHT: (C)2012,JPO&INPIT |
