Patent ID: 9252399
Filing Date: 2016-02-02
CPC Classification: H01M,Y02E

Claim Text:
1. A battery casing having a recessed portion on a major surface of the casing, the recessed portion being substantially planar and bordering a remainder of the major surface at a ridge portion only on each of one or two sides of the recessed portion, wherein the ratio of a) the percent surface area of the recessed portion relative to the total surface area of a generally planar surface: b) the depth of the recessed portion relative to the width of the battery casing, is in a range of between about 39:1 and about 42.5:1, and wherein the recessed portion, the ridge portions, and the remainder of the major surface cooperate under an increase of gauge pressure to cause a plane defined by a boundary between the ridge portions and the remainder of the major surface to move, whereby at least a portion of the recessed portion flexes under the increase of gauge pressure to a point beyond a position of where the plane existed prior to the increase of gauge pressure, and wherein a boundary between the ridge portion and the recessed portion remains recessed relative to the plane defined by the boundary between the ridge portions and remainder of the major plane up to a gauge pressure of at least 2 kg/cm 2 .