Secondary battery and power device

The utility model relates to the technical field of batteries, and particularly discloses a secondary battery and a power plant, the secondary battery comprises: a housing arranged on two opposite sides of a battery cell module; the plurality of supporting parts and the plurality of detection parts are uniformly arranged between the shell and the battery cell module, and the plurality of supporting parts are arranged on the periphery of each detection part; wherein the supporting part is used for generating deformation after the battery cell module is subjected to thermal runaway, so that after the first gap and the second gap are reduced at the same time, the detection part is in contact with the battery cell module and then outputs a thermal runaway signal. According to the secondary battery disclosed by the utility model, not only is the damping performance improved, but also whether the secondary battery is subjected to thermal runaway can be detected in time when a BMS thermal runaway detection method fa