BATTERY SHIELD AND SECONDARY BATTERY COVERING SAID BATTERY SHIELD

Abstract

The present invention relates to a battery casing with superior durability and a secondary battery comprising said battery casing, wherein the battery casing according to the present invention comprises a first polymer layer, a second polymer layer, and a gas barrier layer disposed between the first polymer layer and the second polymer layer, and comprises at least one cup portion curved in one direction, wherein the K value according to Equation (1) is 63.0 or more. Equation (1): K = P / C + 50D In Equation (1), P is the thickness value of the battery casing measured in μm, C is the depth value of the bowl section measured in mm, and D is the ratio of the thickness of the gas barrier layer to the total thickness of the first polymer layer and the second polymer layer.