Stepped electrode assembly

摘要

Disclosed herein is an electrode assembly including two or more electrode plates, each of which has electrode tabs, and a separator plate disposed between the electrode plates and/or a one-unit separation sheet disposed between the electrode plates to cover side surfaces of the electrode plates, which constitute an electrode tab non-formation region, wherein the electrode plates are stacked in a height direction on the basis of a plane such that the electrode plates having opposite polarities face each other in a state in which the separator plate and/or the separation sheet is disposed between the electrode plates, a stack constituted by the electrode plates includes electrode plates having different sizes, and an absolute value of the difference in thickness between the electrode plates having different sizes facing each other is 0 to 79 μm.

主权项

1. An electrode assembly comprising:
two or more unit cells, each unit cell including:
two or more electrode plates, each of which has at least one electrode tab, anda separator plate disposed between adjacent electrode plates,wherein the electrode plates are stacked in a height direction on the basis of a plane such that the electrode plates having opposite polarities face each other in a state in which the separator plate is disposed between adjacent electrode plates, and a one-unit separation sheet disposed between adjacent unit cells to cover major and side surfaces of all of the unit cells, which constitute an electrode tab non-formation region, wherein at least two of the unit cells have different sizes, and the unit cells are stacked in the height direction, wherein the electrode plates comprise cathode plates, each of which has a cathode slurry layer formed on a cathode current collector, and anode plates, each of which has an anode slurry layer formed on an anode current collector, wherein the cathode plates comprise single-sided cathode plates, each of which has the cathode slurry layer formed on only one major surface of the cathode current collector, and double-sided cathode plates, each of which has the cathode slurry layer formed on opposite major surfaces of the cathode current collector, wherein a cathode current collector of each of the single-sided cathode plates has a larger thickness than that of each of the double-sided cathode plates.