Battery Cell and Battery Device Including the Same

A battery cell comprises a cell housing having an accommodation portion accommodating an electrode assembly, a vent hole provided in a portion of the cell housing to communicate externally, and a venting device sealing the vent hole, wherein the venting device comprises a first venting portion communicating with the accommodation portion, a second venting portion spaced apart from the first venting portion and communicating externally, a side surface portion in which both open ends are connected to the first venting portion and the second venting portion to form a filtration space, and a filter portion disposed in the filtration space to filter gas.