Batteries aren't very flexible. If you twist them, they tend to lose their charge, and that is a major problem for embedded designers looking at wearable systems who have been restricted to button or even AAA cells. This limits how small the designs can be.
Now Panasonic has developed a new flexible battery that is just half a millimetre thick and retains its charge through 1000 twists, allowing wearables to be powered more effectively. The details, at EETimes Power, also show the weight varies from 0.7g to 1.9g, helping designers with lightweight systems.
The family of 3.8V rechargeable batteries ranges from 17 mAh to 60 mAh and can retain their characteristics even after repeatedly bent into a radius of 25mm or twisted to an angle of 25 degrees. The battery can maintain more than 99% of its initial capacity after 1,000 bends with a radius of 25mm, or after twisted 1,000 times with an angle ±25°/100mm
This comes from a newly developed laminated outer layer and newly developed internal laminate structure and stacked electrode, where Panasonic has filed 25 patents from the development.