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. 16, 2007
Filed:
Oct. 01, 2002
Norikazu Iwasaki, Kanuma, JP;
Masami Kawazu, Kanuma, JP;
Hisaya Tamura, Kanuma, JP;
Kazutaka Furuta, Kanuma, JP;
Norikazu Iwasaki, Kanuma, JP;
Masami Kawazu, Kanuma, JP;
Hisaya Tamura, Kanuma, JP;
Kazutaka Furuta, Kanuma, JP;
Sony Corp., Tokyo, JP;
Sony Chemical & Information Device Corporation, Tokyo, JP;
Abstract
A secondary battery with high safety is provided. A heater and a diode are connected in series, and a thermistor is connected in parallel with thus formed series circuit. A fuse is connected in series with thus formed parallel circuit to form a protective circuit, which is attached to an accumulator to complete a secondary battery. In the case of overcharging, the accumulator generates heat so that the thermistor heats up to increase the resistance value. As a result, the current pass through the heater, which generates heat to break the fuse. In the case of short circuit, the diode is reverse-biased and no current passes through the heater so that the fuse does not break.