Patent ID: 10490843

Abstract:
A flexible and foldable lithium ion battery is disclosed having an operational bend radius of 180 degrees with no interruption in supply of electrical power. The lithium ion battery includes a high-elasticity separator sponge having a porosity of approximately 70% to approximately 90%. The separator is a polymer-based fiber mat having fibers with a submicron diameter. The separator sponge has a thickness in a range of approximately 5 to 50 microns, an air permeability of approximately 100 to approximately 300 s/100 ml, and a puncture resistance of approximately 350 to approximately 950 N. First and second electrodes are disposed on either side of the separator sponge and include active materials positioned on thin metal current collectors. A liquid electrolyte is absorbed by the separator sponge. The battery may be folded upon itself without loss of power.