Patent ID: 11949061
Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A secondary battery comprising:
a first film;
a second film; and
a stacked layer comprising:
a first negative electrode current collector;
a first negative electrode active material layer on the first negative electrode current collector;
a first separator on the first negative electrode active material layer;
a first positive electrode active material layer on the first separator;
a first positive electrode current collector on the first positive electrode active material layer;
a second positive electrode current collector on the first positive electrode current collector;
a second positive electrode active material layer on the second positive electrode current collector;
a second separator on the second positive electrode active material layer;
a second negative electrode active material layer on the second separator; and
a second negative electrode current collector on the second negative electrode active material layer,

wherein each of an inside surface and an outside surface of the first film has a first pattern of depressions or projections with a first pitch,
wherein each of an inside surface and an outside surface of the second film has a second pattern of depressions or projections with a second pitch,
wherein the first pitch is smaller than the second pitch,
wherein the stacked layer is positioned inside the first film and the second film, and
wherein the secondary battery is capable of deforming.