FLEXIBLE JELLY-ROLL TYPE SECONDARY BATTERY

摘要

There is provided a jelly-roll type electrode assembly. In the jelly-roll type electrode assembly including a cathode including a cathode active material coating layer and an anode including an anode active material coating layer, with a separation film interposed therebetween, and formed to be rolled, the jelly-roll type electrode assembly is characterized in that the anode and the cathode include uncoated portions, the uncoated portions are overlapped and include mirror images formed on a front surface and a rear surface, and the jelly-roll type electrode assembly is flexible in the uncoated portion. A pouch-type secondary battery, a battery pack and a device including the electrode assembly are provided. A flexible jelly-roll type secondary battery may be reversibly flexible while blocking the separation of an electrode active material from a current collector surface.

主权项

1. A jelly-roll type electrode assembly including a cathode including a cathode active material coating layer formed by coating both surfaces of a cathode current collector with a cathode active material, and an electrode tap; an anode including an anode active material coating layer formed by coating both surfaces of an anode current collector with an anode active material, and an electrode tap; and a separation film interposed between the anode and the cathode, the jelly-roll type electrode assembly being formed to be rolled,
the jelly-roll type electrode assembly characterized in that, the anode and the cathode include uncoated portions not coated with a cathode active material and an anode active material, the uncoated portions are overlapped with each other on the respective cathodes and anodes and include mirror images formed on a front surface and a rear surface thereof based on a jelly-roll formed central surface, and the jelly-roll type electrode assembly is flexible in the uncoated portion.