Patent ID: 9577228
Date: 2017-02-21
CPC Classifications: H01M,Y02E

Claim:
1. A battery pack for detachably mounting to a device body of an electric tool or a charger, comprising: a battery side terminal electrically connectible with a device side terminal of the device body, the device side terminal being configured to have a shape of a flat plate and having a first side surface and a second side surface opposite to each other; wherein: the battery side terminal comprises a first contact portion and a second contact portion arranged to be opposed to each other, and a third contact portion and a fourth contact portion arranged to be opposed to each other, the first contact portion and the third contact portion being configured to form an electric contact through contact with the first side surface of the device side terminal, and the second contact portion and the fourth contact portion being configured to form an electric contact through contact with the second side surface of the device side terminal; the first contact portion is configured to contact the first side surface in a first contact range having a first length; the second contact portion is configured to contact the second side surface in a second contact range having a second length that is less than the first length; the first contact portion and the second contact portion extend in a first direction, and the first length and the second length extend in a second direction that is substantially perpendicular to the first direction; the third contact portion is configured to contact the first side surface in a third contact range having a third length; the fourth contact portion is configured to contact the second side surface in a fourth contact range having a fourth length that is less than the third length; the third contact portion and the fourth contact portion extend in the first direction, and the third length and the fourth length extend in the second direction; and the first contact range and the second contact range at least partly overlap with one another along the second direction, and the third contact range and the fourth contact range at least partly overlap one another along the second direction.