Patent ID: 9543551
Date: 2017-01-10
CPC Classifications: B60R,H01M,Y02E

Claim:
1. A battery unit comprising: a battery; a storage case in which the battery is installed, the storage case including a first casing member, a second casing member, and an intermediate casing member, the first casing member defining a bottom of the storage case, the second casing member defining a top of the storage case with the battery disposed between itself and the first casing member, the second casing member being joined to the first casing member so as to create a clearance which extends along a circumference of a peripheral wall of the storage case, the intermediate casing member being disposed between the first casing member and the second casing member to form an intermediate wall that is a portion of the peripheral wall of the storage case, the intermediate casing member being lower in stiffness than the first and second casing members; and a pressing mechanism comprised of at least one coil spring, the at least one coil spring being disposed between the second casing member and a major surface of the battery, the at least one coil spring provided so as to exert mechanical pressure on a center of gravity of the battery through the major surface of the battery, and thereby retaining the battery within the storage case, wherein the intermediate casing member is fixed on the first casing member, each of the second casing member and the intermediate casing member being equipped with a fixing portion which is secured to and in contact with the first casing member in the same direction as that in which the second casing member is joined to the first casing member, and wherein one of opposed ends of the intermediate wall that faces the first casing member is placed at a given interval away from one of opposed ends of the first casing member, and the other end of the intermediate wall is placed at a given interval away from one of opposed ends of the second casing member, and wherein the second casing member has ribs formed thereon to reinforce the second casing member against a reactive force arising from a mechanical pressure on the center of gravity of the battery.