A battery comprising a battery can, an electrode assembly and a swelling tape for filling a gap formed between the battery can and the electrode assembly, wherein the gap is formed by a first substrate and a second substrate spaced apart from the first substrate, wherein one of the first and second substrates is the electrode assembly and the other is the can receiving the assembly, the swelling tape comprising: a substrate layer that deforms along a longitudinal direction when coming in contact with an electrolyte, wherein the electrolyte is a carbonate-based electrolyte; a pressure-sensitive adhesive layer formed on one surface of the substrate layer in a direction parallel to a longitudinal direction of the substrate layer, wherein the substrate layer includes a thermoplastic polyurethane and has a strain of at least 10% in a longitudinal direction according to the following Equation 1: Strain in Longitudinal direction = L 2 − L 1 / L 1 × 100 wherein L 1 is an initial length of the substrate layer before the substrate layer comes in contact with the carbonate-based electrolyte; and L 2 is a length of the substrate layer, which is measured after the substrate layer comes in contact with the carbonate-based electrolyte at room temperature in a range of 20 to 30°C for 24 hours, and wherein the pressure-sensitive adhesive layer has a peel strength of 0.98 N/25 mm or more (100 gf/25 mm or more) at room temperature in a range of 20 to 30°C, which is measured at a peel rate of 5 mm/sec and a peel angle of 180° to a glass plate; wherein the swelling tape is configured to realize a 3D shape that protrudes in a vertical direction to the longitudinal direction of the substrate by swelling through contacting the swelling tape with the electrolyte in a state where the swelling tape is fixed by the pressure-sensitive adhesive layer and wherein a size of the 3D shape is from 0.001 mm to 2 mm. a substrate layer that deforms along a longitudinal direction when coming in contact with an electrolyte, wherein the electrolyte is a carbonate-based electrolyte; a pressure-sensitive adhesive layer formed on one surface of the substrate layer in a direction parallel to a longitudinal direction of the substrate layer, wherein the substrate layer includes a thermoplastic polyurethane and has a strain of at least 10% in a longitudinal direction according to the following Equation 1: Strain in Longitudinal direction = L 2 − L 1 / L 1 × 100 wherein L 1 is an initial length of the substrate layer before the substrate layer comes in contact with the carbonate-based electrolyte; and L 2 is a length of the substrate layer, which is measured after the substrate layer comes in contact with the carbonate-based electrolyte at room temperature in a range of 20 to 30°C for 24 hours, and wherein the pressure-sensitive adhesive layer has a peel strength of 0.98 N/25 mm or more (100 gf/25 mm or more) at room temperature in a range of 20 to 30°C, which is measured at a peel rate of 5 mm/sec and a peel angle of 180° to a glass plate; wherein the swelling tape is configured to realize a 3D shape that protrudes in a vertical direction to the longitudinal direction of the substrate by swelling through contacting the swelling tape with the electrolyte in a state where the swelling tape is fixed by the pressure-sensitive adhesive layer and wherein a size of the 3D shape is from 0.001 mm to 2 mm.