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:
Jun. 28, 2011
Filed:
Apr. 04, 2006
Takao Aradachi, Hitachinaka, JP;
Nobuhiro Takano, Hitachinaka, JP;
Tomomasa Nishikawa, Hitachinaka, JP;
Hiroyuki Hanawa, Hitachinaka, JP;
Masayuki Ogura, Hitachinaka, JP;
Kazuhiko Funabashi, Hitachinaka, JP;
Takao Aradachi, Hitachinaka, JP;
Nobuhiro Takano, Hitachinaka, JP;
Tomomasa Nishikawa, Hitachinaka, JP;
Hiroyuki Hanawa, Hitachinaka, JP;
Masayuki Ogura, Hitachinaka, JP;
Kazuhiko Funabashi, Hitachinaka, JP;
Hitachi Koki Co., Ltd., Tokyo, JP;
Abstract
A compact battery pack with high handling ability and restraining degradation of battery cells. The battery pack includes an insertion portion to be inserted into a handle portion of a cordless power tool and an accommodation portion in which all battery cells are accommodatable. A protection board with a protection circuit that protects batteries against overcharge and over-discharge is installed in the insertion portion. A switching element is connected between the battery cells and a drive motor of the power tool. An air passage in communication with the battery pack is formed within the handle and a main housing of the cordless power tool. The switching element is positioned at the air passage.