Power storage device, battery management unit, and electronic device
A repeatedly bendable power storage device. A highly reliable power storage device. A long-life power storage device. A repeatedly bendable electronic device. A flexible electronic device. The power storage device includes a film, a positive electrode, and a negative electrode. The film includes a plurality of projections. A difference between the maximum height and the minimum height of a surface of the film is greater than or equal to 0.15 mm and less than 0.8 mm. The modulus of rigidity of the film is less than 6.5×10 9 N. The film includes a metal layer. The thickness of the metal layer is greater than or equal to 5 μm and less than or equal to 200 μm. The positive electrode and the negative electrode are surrounded by the film.
1. A power storage device comprising:
a film;
a positive electrode; and
a negative electrode,
wherein the film includes embossed projections,
wherein each of the embossed projections has a cross shape in a plan view,
wherein a difference between a maximum height and a minimum height of the embossed projections is greater than or equal to 0.15 mm and less than 0.8 mm,
wherein a modulus of rigidity of the film is less than 6 5×10 9 N/m 2 ,
wherein the film comprises a metal layer,
wherein a thickness of the metal layer is greater than or equal to 5 μm and less than or equal to 200 μm, and
wherein the positive electrode and the negative electrode are surrounded by the film.
2. The power storage device according to claim 1 ,
wherein distortion at a point of rupture of the film is greater than 0.6 and less than or equal to 2.
3. The power storage device according to claim 1 ,
wherein the metal layer comprises aluminum.
4. A battery management unit comprising the power storage device according to claim 1 .
5. An electronic device comprising the power storage device according to claim 1 .