Hidden lifting mechanism for battery pack thermal diffusion safety test device

The utility model discloses a hidden lifting mechanism for a battery pack thermal diffusion safety test device. The lifting device comprises four spiral lifting mechanisms buried below the ground level, the four spiral lifting mechanisms are connected with four supporting points of a test rack of the battery pack respectively, and the four spiral lifting mechanisms drive the test rack to ascend from a water pool below the ground level or descend into the water pool below the ground level; and the four spiral lifting mechanisms are connected with one another through a set of synchronous transmission device, and are driven by the same driving motor to realize synchronous lifting, so that the test rack can be stably lifted in the lifting process. According to the utility model, the test rackis lifted through the lifting mechanism hidden below the ground level, so that the test rack can be lifted up during a battery pack thermal diffusion test, and the battery pack sinks into the water tank after the battery pack