Diaphragm accumulator and vehicle

The utility model discloses a diaphragm energy accumulator and a vehicle. The diaphragm energy accumulator comprises a shell and a diaphragm, the diaphragm is arranged in the shell in a turnover manner; the clamping ring is arranged in the shell, the diaphragm is clamped on the clamping ring, the clamping ring is provided with a first contact part, the diaphragm is provided with a second contact part matched with the first contact part, and at least one of the first contact part and the second contact part is in an arc shape. According to the diaphragm energy accumulator, at least one of the first contact part and the second contact part is configured to be arc-shaped, so that when the diaphragm is in contact with the clamping ring, the arc-shaped structure can reduce the friction force of contact between the clamping ring and the diaphragm, and the diaphragm is not easy to damage in the overturning process, so that the service life of the diaphragm can be prolonged, and the diaphragm energy accumulator can work normally.