Secondary Battery And Method For Manufacturing The Same
An electrode for a secondary battery may include an electrode collector, a coating portion having an active material coated on the electrode collector, a first non-coating portion on which the active material is not applied to the electrode collector, and a second non-coating portion on which the active material is not applied to the electrode collector. The first non-coating portion may be adjacent to the coating portion in a width direction perpendicular to a longitudinal direction of the electrode collector, the first non-coating portion having a longitudinal dimension extending along the longitudinal direction, the first non-coating portion configured to be bent and electrically coupled to a can member of the secondary battery. The second non-coating portion may be adjacent to the coating portion in the longitudinal direction. The electrode may be stacked into a stack with a separator and a second electrode of an opposite polarity than the electrode.
1 . A secondary battery, comprising:
a can member; and
an electrode assembly having a positive electrode, a negative electrode and a separator disposed therebetween, the positive electrode, the negative electrode, and the separator being wound together about an axis into a jelly-roll shape,
wherein the positive electrode or the negative electrode comprises:
an electrode collector;
a coating portion having an active material coated on the electrode collector;
a first non-coating portion on which the active material is not applied to the electrode collector, the first non-coating portion being adjacent to the coating portion in a width direction perpendicular to a longitudinal direction of the electrode collector, the first non-coating portion having a longitudinal dimension extending along the longitudinal direction of the electrode collector, the first non-coating portion configured to be bent and electrically coupled to the can member; and
a second non-coating portion on which the active material is not applied to the electrode collector, the second non-coating portion being adjacent to the coating portion in the longitudinal direction.
2 . The secondary battery of claim 1 , wherein the second non-coating portion is located at a longitudinal end of the electrode collector.
3 . The secondary battery of claim 1 , wherein the first non-coating portion is spaced apart from the second non-coating portion.
4 . The secondary battery of claim 3 , wherein the first non-coating portion is spaced apart from the second non-coating portion along the longitudinal direction of the electrode collector.
5 . The secondary battery of claim 1 , wherein the electrode collector defines a first width in the width direction along the first non-coating portion in the longitudinal direction, and wherein the electrode collector defines a second width in the width direction along a segment of the electrode collector in the longitudinal direction that excludes the first non-coating portion, the first width being greater than the second width.
6 . The secondary battery of claim 5 , wherein the segment of the electrode collector is a remainder of the electrode collector in the longitudinal direction that excludes the first non-coating portion.
7 . The secondary battery of claim 5 , wherein the segment of the electrode collector extends along the second non-coating portion in the longitudinal direction.
8 . The secondary battery of claim 1 , wherein the first non-coating portion continuously extends across ⅓ or more of a total length of the coating portion in the longitudinal direction.
9 . The secondary battery of claim 1 , wherein the first non-coating portion continuously extends across at least two circumferential windings of the electrode collector in the longitudinal direction.
10 . The secondary battery of claim 1 , wherein the first non-coating portion is attached to the can member.
11 . The secondary battery of claim 1 , further comprising an electrode tab attached to and extending from the second non-coating portion.
12 . The secondary battery of claim 1 , wherein the first non-coating portion is configured such that an electric current in the first non-coating portion flows toward the can member in the width direction.
13 . The secondary battery of claim 1 , wherein the first non-coating portion is formed from a metal foil of the electrode collector.
14 . The secondary battery of claim 1 , wherein the can member has a cylindrical shape.