Flexible closure for energy storage device and energy storage device including same

摘要

The present application relates to an energy storage device. In one aspect, the energy storage device includes: an electrode unit including a first current collector and a second current collector separated by a separator; First and second terminals respectively connected to the first and second current collectors; And a case accommodating the electrode unit. In addition, the energy storage device is a flexible closure that covers the case and has first and second through-holes penetrating therethrough, and exposes the first and second terminals to an environment, the The flexible closure includes a flexible closure that contains up to about 15% by weight of SiO 2 . According to some embodiments, since the weight percentage of SiO 2is significantly reduced, the amount and degree of SiO 2 is significantly reduced, and structural deformation of the flexible closure at a fine level is minimized. Thus, the wetting phenomenon is remarkably reduced, and the life of the energy storage device is remarkably increased.