Refrigerant amount monitoring and charging control system for electric vehicle and method thereof

A refrigerant amount monitoring and charging control system for an electric vehicle, the system comprising:

• a controller;
• a battery management module electrically connected to the controller;
• a high-speed charging gun connected to the vehicle when the vehicle is charged and configured to generate a high-speed charging signal during performing high-speed charging and to send the high-speed charging signal to the controller;
• an ambient temperature sensor electrically connected to the controller and configured to obtain an ambient temperature and to send the obtained ambient temperature to the controller;
• and
• a chiller including an electronic expansion valve and an evaporator,
• wherein the electronic expansion valve is configured to adjust an amount of a refrigerant passing through the evaporator based on a signal from a step motor of the electronic expansion valve, and the evaporator is configured to cool a battery coolant through a phase change of the refrigerant when the refrigerant passes through the evaporator,
• wherein the controller is configured to determine an opening amount of the electronic expansion valve based on the signal from the step motor of the electronic expansion valve and to determine a current refrigerant amount based on the ambient temperature and the opening amount of the electronic expansion valve, and
• wherein the controller is configured to control the battery management module to reduce charging power based on that the determined current refrigerant amount is greater than a first reference value and less than or equal to a second reference value, and to control the battery management module to terminate the high-speed charging when the determined current refrigerant amount is less than or equal to the first reference value.