Secondary Battery with improved Stability having Heat Expandable Tape and Method thereof

The present invention relates to a battery pack comprising a plurality of battery cells, wherein the heat generated in the charging and discharging process and the internal gas generated thereby are discharged to the outside of the battery cell by applying a thermal expansion tape. The present invention relates to a battery cell with improved safety and a method of manufacturing the same, which can improve the safety of the pouch type secondary battery pack by discharging gas generated inside the pouch type secondary battery, Because of the pressure, there is an effect of repeated gas emission through the construction of the effect and the thermo-expansive fixed unit which can operate without separate device and external power source.