Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Masaaki Fukumoto0
Masafumi Noda0
Takuya Umemura0
Date of Patent
June 9, 2015
0Patent Application Number
132090830
Date Filed
August 12, 2011
0Patent Citations Received
Patent Primary Examiner
Patent abstract
A battery pack of an electric power tool comprises ten lithium-ion cells. The ten lithium-ion cells are connected in series. Each lithium-ion cell has a diameter equal to or less than 18 millimeters, a length equal to or less than 65 millimeters, and an internal resistance equal to or less than 30 milliohms. Because the battery pack has a high voltage in operation and is therefore able to supply large current, the battery pack is preferably configured incapable of being used in a conventional electric power tool that cannot operate under such a large current.
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