Electrode assembly and composite electrode assembly of stair-like structure

摘要

Disclosed herein are an electrode assembly and a composite electrode assembly mounted in a battery case of a secondary battery. The electrode assembly and the composite electrode assembly have a stair-like structure. The stair-like structure is formed based on the curvature of a device to utilize a dead space of the device, thereby improving the capacity of the device per unit volume.

主权项

1. A composite electrode assembly comprising:
at least two polar bodies selected from a group consisting of:
(i) an electrode plate,(ii) a stacked and folded type electrode assembly comprising two or more electrode plates having the same size and a one-unit sheet type separation film to cover one major surface, another major surface, and side surfaces of each of the electrode plates, which constitute an electrode tab non-formation region, the electrode plates being 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 separation film is disposed between the electrode plates, and(iii) a stacked type electrode assembly comprising electrode plates having opposite polarities arc stacked in a height direction on the basis of a plane in a state in which a separator plate is disposed between the electrode plates; wherein at least two of the at least two polar bodies are different ones selected from the group consisting of (i), (ii), and (iii), wherein the at least two polar bodies being stacked in a height direction on the basis of a plane such that the electrode plates having opposite polarities are arranged in a state in which the separator plate or the sheet type separation film is disposed between the electrode plates; and wherein the composite electrode assembly further includes one or more other electrode plates having different sizes from the electrode plates of the respective electrode plate(s) of the at least two polar bodies, and a stack structure of the at least two polar bodies having different sizes forms a stair-like structure comprising one or more steps, each having a width and a height.