Electrode assembly and secondary battery including same

An electrode assembly comprising:

• a positive electrode plate comprising a positive electrode collector and a positive electrode active material applied on the positive electrode collector, wherein, in the positive electrode collector, a positive electrode non-coated portion, to which the positive electrode active material is not applied, is formed;
• a negative electrode plate comprising a negative electrode collector and a negative electrode active material applied on the negative electrode collector, wherein, in the negative electrode collector, a negative electrode non-coated portion, to which the negative electrode active material is not applied, is formed;
• a separator interposed between the positive electrode plate and the negative electrode plate;
• a positive electrode tab electrically connected to the positive electrode collector of the positive electrode plate;
• and
• a negative electrode tab electrically connected to the negative electrode collector of the negative electrode plate,
• wherein the positive electrode plate, the negative electrode plate, and the separator are wound in a state of being sequentially stacked,
• wherein the positive electrode non-coated portion is disposed between a front end and a rear end of the positive electrode plate in a winding direction,
• wherein the positive electrode tab is attached to the positive electrode collector on the positive electrode non-coated portion,
• wherein the negative electrode non-coated portion comprises a primary negative electrode non-coated portion formed between a front end and a rear end of the negative electrode plate in the winding direction and a secondary negative electrode non-coated portion formed on the rear end of the negative electrode plate,
• wherein the negative electrode tab is disposed on the primary negative electrode non-coated portion,
• wherein the positive electrode plate comprises:
• a first positive electrode coated portion, in which the positive electrode active material is formed on both surfaces of the positive electrode collector, at the front end of the positive electrode plate;
• a second positive electrode coated portion, in which the positive electrode active material is formed on both surfaces of the positive electrode collector, at the rear end of the positive electrode plate;
• a third positive electrode coated portion, in which the positive electrode active material is formed on both side of the positive electrode collector, at a position adjacent to the positive electrode non-coated portion;
• and
• a positive electrode half coated portion, in which the positive electrode active material is formed on one surface of the positive electrode collector, at a position between the first and third positive electrode coated portions, with the positive electrode half coated portion being adjacent to the first and third positive electrode coated portion, or between the second and third positive electrode coated portions.