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:
Mar. 12, 2002
Filed:
Aug. 18, 2000
Takashi Hasunuma, Narita, JP;
Atsushi Watanabe, Hyogo, JP;
Kazuo Osaki, Hyogo, JP;
Fumiyoshi Yoshinari, Tokushima, JP;
Other;
Abstract
A battery pack and a PTC device are provided that can be used safely under large current loads by increasing the area of the incorporated PTC layer so as to decrease its internal resistance. The battery pack has a plurality of unit cells ( ) placed side by side in parallel and the PTC device P to protect the unit cells ( ) from overcurrents. The PTC device P has a first electrode ( ) and a second electrode ( ) connected to the both surfaces of the PTC layer ( ). The PTC layer is formed to an outer shape that covers almost the entirety of the end surfaces of the two unit cells ( ) to which the first electrode ( ) and the second electrode ( ) are connected, and has through holes ( B) positioned against the end electrodes ( A) of the unit cells ( ). The first electrode ( ) and the second electrode ( ) connected to the both surfaces of the PTC layer ( ) are formed to an outer shape almost the same as the outer shape of the PTC layer ( ); and the first electrode ( ) and the second electrode ( ) are connected to the end electrodes ( A) of the unit cells ( ) at points where the through holes ( B) of the PTC layer ( ) are located.