Electrode assembly and secondary battery using the same

摘要

An electrode assembly includes first and second electrode plates respectively comprising first and second active material portions on which first and second active materials are coated and first and second non-coating portions on which the first and second active materials are not coated; a separator interposed between the first and second electrode plates; and first and second electrode tabs respectively coupled to the first and second non-coating portions. In the electrode assembly, portions of the first and second non-coating portions are opposite to each other but the first and second electrode tabs are not opposite to each other in the electrode plates. The electrode assembly is formed by winding the first and second electrode plates from the portion at which the first and second non-coating portions are opposite to each other. A secondary battery includes the electrode assembly and a case accommodating the electrode assembly therein.

主权项

1. An electrode assembly comprising:
a first electrode plate comprising a first active material portion on which a first active material is coated and a first non-coating portion that has two edges on which the first active material is not coated between the two edges of the non-coating portion; a second electrode plate comprising a second active material portion on which a second active material is coated and a second non-coating portion that has two edges on which the second active material is not coated between the two edges of the non-coating portion; a separator interposed between the first and second electrode plates wherein the first and second electrode plates are positioned so that the first edge of the first electrode plate is positioned adjacent the first edge of the second electrode plate and the second edge of the first electrode plate is positioned adjacent the second edge of the second electrode plate; and first and second electrode tabs respectively coupled to the first and second non-coating portions so that the first electrode tab extends outward from the first edge of the first non-coating portion of the first electrode plate in a first direction and so that the second electrode tab extends outward from the second edge of the second non-coating portion of the second electrode plate in a second direction that is opposite the first direction, and wherein a portion of the first and second electrode tabs at which the first or second electrode tab contacts the first or second non-coating portion is chamfered, wherein portions of the first and second non-coating portions are opposite to each other and overlap each other, the chamfered portions of the first and second electrode tabs being positioned adjacent each other and contoured so that the combined thickness of the overlapped non-coating portions having the coupled first and second electrode tabs is substantially the same from the first edge to the second edge, and the electrode assembly is formed by winding the first and second electrode plates from the portion at which the first and second non-coating portions face each other and wherein the first and second electrode tabs are arranged so that the thicknesses of the first electrode tab on the first electrode plate and the second electrode tab on the second electrode plate are substantially equal to each other between the first and second edges of the first and second electrode tabs.