Carbon dioxide phase change energy storage and release method and system

A carbon dioxide phase change energy storage and release system, comprising an energy storage sub-system, wherein the energy storage sub-system comprises a condensation assembly;

• wherein the condensation assembly comprises a first phase change converter, a liquid storage member and a liquid-phase carbon dioxide purification assembly, and the first phase change converter and the liquid-phase carbon dioxide purification assembly are connected to the liquid storage member individually;
• wherein the first phase change converter is configured to convert gas-phase carbon dioxide into liquid-phase carbon dioxide, the liquid storage member is configured to store the liquid-phase carbon dioxide, and the liquid-phase carbon dioxide purification assembly is configured to:
• in response to a stored liquid level of the liquid-phase carbon dioxide reaching a set liquid level, perform a liquid-phase carbon dioxide purification process to remove impurity liquid from the liquid-phase carbon dioxide;
• wherein the liquid-phase carbon dioxide purification assembly comprises an impurity liquid discharge pipeline, a liquid level sensor, a temperature sensor, a valve and a controller;
• and the temperature sensor and the valve are disposed on the impurity liquid discharge pipeline, and the liquid level sensor and the temperature sensor are signally connected to the controller;
• and
• wherein the liquid level sensor is configured to determine the stored liquid level of the liquid-phase carbon dioxide and generate liquid level determination information, the temperature sensor is configured to collect a temperature of the impurity liquid discharge pipeline in real-time, and the controller is configured to control the valve to open according to the liquid level determination information, and control the valve to keep open or control the valve to close according to the temperature.