US Patent 11069488 Hybrid energy storage device

A hybrid energy storage device is provided. The energy storage device represents a combined capacitor and battery in modular form. The capacitor and the battery may be individually selected based on application needs, and then mechanically combined into a single electrical energy storage device. A method of forming a charge storage device is also provided herein. The method includes selecting a size for a capacitor, and selecting a size for a battery. A module for the capacitor having the selected size and a separate module for the battery having the selected size are then mechanically and electrically connected to form an integral energy storage device.