Patent ID: 11888113
Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 7:
8. A secondary battery comprising:
a plurality of sets of positive electrodes and negative electrodes, the plurality of sets of positive electrodes and negative electrodes comprising:
a first negative electrode current collector comprising a first region;
a first positive electrode current collector comprising a second region;
a second positive electrode current collector comprising a third region; and
a second negative electrode current collector comprising a fourth region,

wherein the first region, the second region, the third region and the fourth region overlap one another,
wherein the first region comprises a first surface and a second surface opposite to the first surface,
wherein the second region comprises a third surface and a fourth surface opposite to the third surface,
wherein the third region comprises a fifth surface and a sixth surface opposite to the fifth surface,
wherein the fourth region comprises a seventh surface and an eighth surface opposite to the seventh surface,
wherein the third surface of the second region faces the second surface of the first region,
wherein the fourth surface of the second region faces the fifth surface of the third region,
wherein the sixth surface of the third region faces the seventh surface of the fourth region,
wherein each of the first surface of the first region and the second surface of the first region is covered with a negative electrode active material layer,
wherein the third surface of the second region is covered with a positive electrode active material layer while the fourth surface of the second region is exposed,
wherein the sixth surface of the third region is covered with a positive electrode active material layer while the fifth surface of the third region is exposed, and
wherein each of the seventh surface of the fourth region and the eighth surface of the fourth region is covered with a negative electrode active material layer.