TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Battery Housing Structure: The housing box comprises a main housing body and a lid body member, and where the lid body member comprises the intake duct member, the outlet port, the bypass passage, the first air flow control valve and the second air flow control valve. Preferred Temperature Control System: The controller is operable to control an air flow rate of the fan. When a temperature measured by the temperature sensor is higher than a reference temperature, the controller operates the first air flow control valve and the second air flow control valve so that air flows from the inlets to outlet port via the housing box. When a temperature measured by the temperature sensor is lower than a reference temperature, the controller operates at least one of the first air flow control valve and the second air flow control valve so that the inlet ports and the outlet port are closed. Preferred Electric Vehicle: The electric vehicle further comprises a controller for controlling operations of the first air flow control valve and the second air flow control valve based on an output received from a temperature sensor arranged in at least one of the inlet ports, the outlet port and the housing box for adjusting temperature of the battery cells. It further comprises a controller for controlling an air flow rate of the fan based on an output received from a temperature sensor arranged in at least one of the inlet ports, the outlet port and the housing box for adjusting temperature of the battery cells. It also comprises a heating element which is operable to heat air re-circulating through the housing box when a temperature measured by the temperature sensor is lower than a reference temperature. Preferred Method: Regulating a temperature of a battery in an electric vehicle further comprises regulating airflow rate of the fan based on output received from the temperature sensor. It further comprises heating air within the battery housing structure when a temperature measured by the temperature sensor is lower than the reference value.