Conductive Power Rod for Electrochemical Cell

Disclosed herein is a design for an electrochemical energy-storage device. The device includes an electrode assembly with a separator that separates a positive electrode and a negative electrode. These electrodes and separator are radially coiled about a central axis to form a central void. A positive electrode current collector is in electrical contact with the positive electrode, while a negative electrode current collector is in electrical contact with the negative electrode. A conductive power rod is positioned in the central void and provides structural support to prevent the collapse of the central void. The rod is either: (a) in electrical contact with the positive electrode current collector and provides a low-resistance current path with a positive terminal; or (b) in electrical contact with the negative electrode current collector and provides a low-resistance current path with a negative terminal. Both terminals are electrically isolated from each other.