A secondary battery includes an electrode assembly having a positive electrode, a negative electrode and a separator interposed between those two electrodes. The secondary battery also includes a container for receiving the electrode assembly inside thereof; a cap assembly electrically connected to the electrode assembly and fixed to the container to seal the container; collector plates electrically connected to the positive electrode and the negative electrodes, and an auxiliary collector plate disposed between at least either the positive or negative electrode and the collector plate corresponding to that electrode.