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:
Jan. 15, 2013
Filed:
Jul. 10, 2009
Satoshi Suzuki, Toyota, JP;
Tooru Nakai, Nagoya, JP;
Satoshi Suzuki, Toyota, JP;
Tooru Nakai, Nagoya, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, Aichi-ken, JP;
Abstract
Provided is a battery capable of providing both fixing durability of a protective film during normal use and peeling easiness of the protective film during operation of a safety valve. A lithium ion secondary battery () includes a protective film () fixed to a battery case () while covering a safety valve part () including a breakable portion (). This protective film () has a first fixed portion () located around a valve-corresponding unfixed portion () and fixed to the battery case () and a second fixed portion () located more outside than the first fixed portion and fixed to the battery case () through an intermediate unfixed portion (). They are configured such that the first fixed portion () first peels off when the safety valve part () operates, prompting peeling of the second fixed portion (), thus releasing gas to the outside.