PURPOSE: An electrode group for secondary battery is provided to improve close adhesion while charging a secondary electrode by using an electrode roll which is expanded at a plat section of the electrode roll. CONSTITUTION: An electrode group for secondary battery includes the following steps. An anode(16) and a cathode(10) are set in between a separator(22). Both electrodes are located opposite to one another. A flat unit(S) and a curve unit(R) are set to an electrode group. A non-directional unit(19) without any revitalization material applied to the outer part is attached to an electrode group. The device enables users to expand the life span of a battery and enhance the capabilities of a battery by improving contact between cathode and anode with a separator(22) located in between the two electrodes because expansion caused by charging only occurs in the part where revitalization material were applied to.
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