Secondary battery
An embodiment of the present invention relates to a secondary battery and addresses the technical problem of providing a secondary battery capable of improving structural stability. To this end, the present invention provides a secondary battery comprising: an electrode assembly which comprises a first electrode plate having a first electrode-uncoated portion along an upper end thereof, a second electrode plate having a second electrode-uncoated portion along a lower end thereof, and a separator interposed between the first electrode plate and the second electrode plate, wherein at least one among the first electrode-uncoated portion and the second electrode-uncoated portion includes a reinforcing portion for reinforcing verticality; a can for accommodating the electrode assembly; a cap assembly for sealing the can; a first current collector plate coupled to an upper end of the first electrode-uncoated portion and electrically connected to the cap assembly; and a second current collector plate coupled to a lower end of the second electrode-uncoated portion and electrically connected to the can.
1 . A secondary battery comprising:
an electrode assembly which comprises a first electrode plate having a first electrode-uncoated portion along an upper end thereof, a second electrode plate having a second electrode-uncoated portion along a lower end thereof, and a separator interposed between the first electrode plate and the second electrode plate, wherein at least one among the first electrode-uncoated portion or the second electrode-uncoated portion includes a first region, a second region, and a bending groove;
a can for accommodating the electrode assembly;
a cap assembly for sealing the can;
a first current collector plate coupled to at least a portion of the first electrode-uncoated portion and electrically connected to the cap assembly; and
a second current collector plate coupled to at least a portion of the second electrode-uncoated portion and electrically connected to the can,
wherein the first region is connected to at least one of the first current collector plate or the second current collector plate,
wherein the second region is adjacent to an active material portion of at least one of the first electrode plate or the second electrode plate and includes a reinforcing portion for reinforcing verticality of the second region, wherein the reinforcing portion is located within the second region and the first region connected to the at least one of the first current collector plate or the second current collector plate, is free of the reinforcing portion,
wherein the first electrode-uncoated portion or the second electrode-uncoated portion that includes the bending groove is configured to be bent about the bending groove,
wherein the reinforcing portion is an embossing portion, the embossing portion being integrally formed with the first electrode-uncoated portion or the second electrode-uncoated portion.
2 . The secondary battery of claim 1 , wherein in the embossing portion, a plurality of embossing patterns elongated in an up-down direction are formed.
3 . The secondary battery of claim 2 , wherein when the first electrode-uncoated portion has the embossing portion, the second region including the embossing portion is provided with a predetermined width along a lower portion of the first electrode-uncoated portion, and
when the second electrode-uncoated portion has the embossing portion, the second region including the embossing portion is provided with a predetermined width along an upper portion of the second electrode-uncoated portion.
4 . The secondary battery of claim 2 , wherein when the first electrode-uncoated portion has the embossing portion, the embossing portion has a depth of 30% to 70% of a thickness of the first electrode-uncoated portion, and
when the second electrode-uncoated portion has the embossing portion, the embossing portion has a depth of 30% to 70% of a thickness of the second electrode-uncoated portion.
5 . The secondary battery of claim 2 , wherein the plurality of embossing patterns is arranged with a constant height along a direction perpendicular to the up-down direction, and each has a length corresponding to a width of the embossing portion.
6 . The secondary battery of claim 2 , wherein the plurality of embossing patterns is arranged with different heights along a direction perpendicular to the up-down direction, and each has a length less than a width of the embossing portion.
7 . The secondary battery of claim 2 , wherein when the first electrode-uncoated portion has the embossing portion, the bending groove is formed above the embossing portion and extends along a direction perpendicular to the up-down direction, and
when the second electrode-uncoated portion has the embossing portion, the bending groove is formed below the embossing portion and extends along a direction perpendicular to the up-down direction.