Electronic device including secondary battery
In the case where a film, which has lower strength than a metal can, is used as an exterior body of a secondary battery, a current collector provided in a region surrounded by the exterior body, an active material layer provided on a surface of the current collector, or the like might be damaged when force is externally applied to the secondary battery. A secondary battery which is resistant to external force in obtained. An opening is provided in a central portion of the secondary battery, and a terminal is formed in the opening. An outer edge of the secondary battery is fixed by thermocompression bonding. In addition, the central portion of the secondary battery is fixed by thermocompression bonding, so that the amount of bending is limited even when the outer edge portion of the secondary battery is bent.
1. A secondary battery comprising:
a first current collector comprising a first tab;
a second current collector comprising a second tab, the second current collector overlapping with the first current collector;
a first lead line electrically connected to the first current collector via the first tab;
a second lead line electrically connected to the second current collector via the second tab;
an electrolyte; and
an exterior body comprising a film, the exterior body comprising a first surface and a second surface opposite to the first surface,
wherein the secondary battery further comprises an opening defined through the exterior body, the first current collector and the second current collector,
wherein the opening is enclosed by a socket,
wherein the exterior body outside an area overlapping the socket is flexible,
wherein a first connection portion between the first lead line and the first tab and a second connection portion between the second lead line and the second tab are inside the socket,
wherein an inside of the socket is filled with an insulator between the first connection portion and the second connection portion,
wherein the opening is configured to arranged so as to pass through the first current collector, the second current collector and the exterior body between the first surface and the second surface of the exterior body,
wherein each of a periphery of the exterior body and a periphery of the opening is bonded by compression bonding so that the electrolyte is sealed in the exterior body,
wherein the first tab is arranged to be protruded into the opening from an inside of the exterior body, and the second tab is arranged to be protruded into the opening from the inside of the exterior body,
wherein each of the first lead line and the second lead line is positioned in a direction crossing the first surface and the second surface of the exterior body, and
wherein the first lead line is arranged to be extending in a first direction, and the second lead line is arranged to be extending in a second direction opposite to the first direction.
2. The secondary battery according to claim 1 , further comprising a separator between the first current collector and the second current collector.
3. The secondary battery according to claim 1 , wherein the opening is provided in a central portion of the exterior body.
4. The secondary battery according to claim 3 , wherein the first current collector further comprises a plurality of first openings arranged in point-symmetric with respect to the opening.
5. The secondary battery according to claim 4 , wherein the second current collector further comprises a plurality of second openings each overlapping with one of the plurality of the first openings.