Electronic device
An arm-worn electronic device used while being worn on an arm is proposed. A novel device that includes a display portion having a curved surface, a secondary battery having a curved surface, and a member for being worn on a user's upper arm so that the display portion and the secondary battery are worn on the user's upper arm. Part of the display portion overlaps with the secondary battery. The novel device is useful for workers in the manufacturing industry and the distribution industry, police officers, fire fighters, health workers, care workers, sales people who work with their hands when it is worn on their arms. The novel device can also be used as military equipment or a wearable computer that assists a user who operates a vehicle or a plane, for the military's sake.
1. A flexible secondary battery comprising:
a first electrode;
a second electrode;
an envelope; and
an exterior body,
wherein the first electrode comprises a first current collector and a first active material layer,
wherein the first active material layer is positioned on a first surface of the first current collector,
wherein the second electrode comprises a second current collector and a second active material layer,
wherein the second active material layer is positioned on a first surface of the second current collector,
wherein a second surface of the first current collector and a second surface of the second current collector are positioned so as to face each other with a part of the envelope sandwiched therebetween,
wherein the second electrode is surrounded by the envelope,
wherein the first electrode comprises a first region covered with the envelope and a second region not covered with the envelope, and
wherein the exterior body includes a layered film including an aluminum film.
2. The flexible secondary battery according to claim 1 , wherein the first active material layer comprises LiFeO 2 or LiCoO 2 .
3. An electronic device comprising:
a flexible secondary battery,
wherein the flexible secondary battery comprises a first electrode, a second electrode, an envelope, and an exterior body,
wherein the first electrode comprises a first current collector and a first active material layer,
wherein the first active material layer is positioned on a first surface of the first current collector,
wherein the second electrode comprises a second current collector and a second active material layer,
wherein the second active material layer is positioned on a first surface of the second current collector,
wherein a second surface of the first current collector and a second surface of the second current collector are positioned so as to face each other with a part of the envelope sandwiched therebetween,
wherein the second electrode is surrounded by the envelope,
wherein the first electrode comprises a first region covered with the envelope and a second region not covered with the envelope, and
wherein the exterior body includes a layered film including an aluminum film.
4. The electronic device according to claim 3 , wherein the first active material layer comprises LiFeO 2 or LiCoO 2 .