| CPC H01M 10/0422 (2013.01) [H01M 10/0431 (2013.01); H01M 50/538 (2021.01); H01M 50/536 (2021.01)] | 16 Claims |
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1. A secondary battery comprising:
a can member; and
an electrode assembly having a positive electrode, a negative electrode and a separator disposed therebetween, which are wounded together in a wound state in a jelly-roll shape,
wherein the positive electrode or the negative electrode comprises:
an electrode collector;
a coating portion coated with an active material on the electrode collector; and
a non-coating portion on which the active material is not applied to the electrode collector, the non-coating portion being adjacent to the coating portion in a width direction perpendicular to a longitudinal direction of the electrode collector, the non-coating portion having a plurality of notching tabs formed therein such that each of the plurality of notching tabs extends away from the coating portion in the width direction,
wherein, when the electrode assembly is in the wound state, the plurality of notching tabs are circumferentially distributed about a central axis of the electrode assembly,
wherein the plurality of notching tabs are bent in a radial direction towards the central axis so as to form an overlapping region in which the plurality of notching tabs overlap one another in the width direction of the electrode collector,
wherein adjacent ones of the plurality of notching tabs are circumferentially spaced apart from one another in a peripheral region, the peripheral region being located farther from the central axis in the radial direction than the overlapping region, and
wherein at least some of the plurality of notching tabs are directly bonded to others of the plurality of notching tabs at the overlapping region so as to define an electrical connection between the plurality of notching tabs and the can member.
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