Device for measuring expansion stress of cylindrical battery

The utility model provides a device for measuring the expansion stress of a cylindrical battery. The device for measuring the expansion stress of the cylindrical battery comprises a clamp, an adjusting part and a pressure sensor, an accommodating cavity is formed in the clamp and is used for accommodating and packaging a battery cell; the pressure sensor is arranged in the accommodating cavity, and the pressure sensor is used for detecting the expansion stress of the battery cell body in the packaged battery cell; one end of the adjusting part is arranged outside the accommodating cavity, the adjusting part pushes the pressure sensor under the action of external force, so that the pressure sensor can be tightly pressed on the packaged battery cell, and the adjusting part can provide initial pressure for the pressure sensor. The pressure sensor in the device for measuring the expansion stress of the cylindrical battery is not in direct contact with the electrolyte, so that the stability of the pressure sensor