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:
Jul. 07, 2015
Filed:
Sep. 27, 2012
Hiroshi Hanai, Anjo, JP;
Hisakazu Okabayashi, Anjo, JP;
Toru Yamada, Anjo, JP;
Masafumi Noda, Anjo, JP;
Takayoshi Endo, Anjo, JP;
Hiroshi Hanai, Anjo, JP;
Hisakazu Okabayashi, Anjo, JP;
Toru Yamada, Anjo, JP;
Masafumi Noda, Anjo, JP;
Takayoshi Endo, Anjo, JP;
MAKITA CORPORATION, Anjo-Shi, JP;
Abstract
A battery pack for an electric power tool includes a control device that determines the necessity of a balancing control to reduce difference in voltages of cells of a battery based upon voltages of the respective cells measured by a voltage measuring device. The control device controls a subject cell, which is subject to the balancing control to discharge via the discharging device when the balancing control is determined to be necessary. A voltage measuring device measures the voltages of the respective cells when a battery charger detecting device detects the connection of the battery charger in a state where the battery has not been connected to the battery charger for a predetermined specified period of time or more and power feeding to the electric power tool has not been performed for the specified period of time or more.