The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 20, 2004
Filed:
Feb. 22, 2001
Yasuhiro Yoshida, Tokyo, JP;
Osamu Hiroi, Tokyo, JP;
Kouji Hamano, Tokyo, JP;
Daigo Takemura, Tokyo, JP;
Sigeru Aihara, Tokyo, JP;
Hisashi Shiota, Tokyo, JP;
Jun Aragane, Tokyo, JP;
Hiroaki Urushibata, Tokyo, JP;
Michio Murai, Tokyo, JP;
Takayuki Inuzuka, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
Conventional separators had a function that their melting made minute holes inside the separator smaller, leading to cut off of ion conductivity in temperature increase due to unusual conditions such as short circuit. However, there was a problem that, at a temperature higher than a certain degree, not only the minute holes were closed but also the separator itself was melted to cause deformation of the separator such as shrink and generation of holes due to melting and insulation was broken. The present invention has been carried out in order to solve the above problems. The separator for batteries of the present invention comprises a first porous layer ( ) containing a thermoplastic resin as a main component and a second porous layer ( ) laminated on the first porous layer ( ), which has higher heat resistance than that of the first porous layer ( ).