| CPC H01M 50/124 (2021.01) [H01M 50/119 (2021.01); H01M 50/121 (2021.01); H01M 50/178 (2021.01); H01M 50/186 (2021.01); H01M 50/55 (2021.01); H01M 50/54 (2021.01)] | 13 Claims |
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1. A battery cell, comprising:
an electrode assembly including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode, with electrode tabs protruding from at least one side of outside peripheral portions of the electrode assembly, each electrode tab being made of metal; and
a battery casing made of elongatable material including a first casing and a second casing provided with a first receiving part and a second receiving part, respectively, the first and second receiving parts respectively accommodating the electrode assembly and having different sizes or shapes, each of the first casing and the second casing being a laminate sheet including a metal layer and a resin layer,
wherein electrode lead grooves are formed at a portion of outside peripheral portions of each of the first and second casings, respectively, which correspond to one another, where electrode leads protrude, the electrode lead grooves being recessed downwardly such that the electrode leads are seated therein, and, prior to sealing the battery casing by thermal fusing, a total depth obtained by adding a depth of the electrode lead grooves formed at the first casing and a depth of the electrode lead grooves formed at the second casing is smaller than a thickness of the electrode
wherein a width of each lead groove at a top surface of the peripheral portion to a bottommost surface of the groove is constant,
wherein in a state in which the first casing is arranged to overlap the second casing and the electrode leads seated in the electrode lead grooves are connected to the electrode tabs protrude from the outside peripheral portions of the first and second casings, the battery casing is sealed by thermal fusion along the outside peripheral portions of the first and second casings,
wherein the electrode lead grooves are elongated by thermal fusion, and
wherein the electrode leads have a constant thickness and the metal of the electrode leads directly contact the resin layer of the first casing and the resin layer of the second casing.
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