| abstract |
The present invention provides an electrode assembly including a positive electrode having a positive electrode active material layer, a negative electrode having a negative electrode active material layer, and a separator separating the positive electrode and the negative electrode; And an electrolyte solution, wherein the separator comprises a porous film and a polyolefin resin film formed by bonding a ceramic material and a binder, and the centerline average roughness (Ra) value of the porous film is 0.3 to 1.5 μm, and the polyolefin The porosity of the resin film is 30 to 60%, the compression ratio of the polyolefin resin film relates to an electrode assembly and a secondary battery having the same, characterized in that 4 to 10%.n n n Accordingly, the present invention can ensure the maximum battery safety in the electrode assembly and the secondary battery having the same, the battery performance is not reduced, in particular, it can provide a secondary battery excellent in low-temperature cycle characteristics. |