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:
Nov. 27, 2001
Filed:
Mar. 09, 1998
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A secondary battery which may be handled in a same way as conventional single cell, if the gas pressure within battery went unusually high the gas is immediately discharged outside, and bursting of the battery is prevented. Sealing portion of the secondary battery is composed by a flexible circuit board having an aperture and a safety circuit mounted thereon, a plus terminal for input/output of control provided with a gas discharge aperture and minus terminal for safety circuit provided with a gas discharge aperture which keep a surface contact with the flexible circuit board at the upper surface and are connected respectively to the safety circuit by wirings, a PTC element keeping a surface contact with the flexible circuit board at the reverse surface, a vent having a slit and is attached to the reverse surface of PTC element, the above members being united into a one-piece unit by an inner gasket, and a subfilter having an aperture and is welded to said vent at the center, which is clamped, together with the inner gasket, by the circumferential edge of an aperture-bearing filter.