| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve the ratio of output relative to the weight and volume of an electric tool. <P>SOLUTION: A battery pack 50 of an electric tool 10 includes 10 lithium ion cells 70. The 10 lithium ion cells 70 are serially connected. Each lithium ion cell 70 has a diameter of 18 mm or less, a length of 65 mm or more, and an internal resistance of 30 mΩ or less. Since this battery pack 50 has a high operation voltage, and can supply a large current, the battery pack 50 is preferably configured so as to be unusable for a conventional electric tool 110 that cannot support a large current. <P>COPYRIGHT: (C)2012,JPO&INPIT |
