Battery Thermal Regulating Unit

A thermal regulating unit for regulating the temperature of a pouch cell battery is provided. The thermal regulating unit is formed as a container having: one or more internal cooling channels for conveying a liquid coolant through the unit; a flexible outer covering which contains the cooling channels; and inlet and outlet ports which penetrate the covering for respectively providing liquid coolant to and removing the liquid coolant from the cooling channels. The flexible outer covering forms a substantially flat major external surface of the unit corresponding in shape to, and for pressing against, a major external surface of the pouch cell battery such that the unit and the pouch cell battery can be held in face-to-face contact. The cooling channels are arranged in the flexible outer covering such that when the provided liquid coolant is pressurized it causes the unit to expand and press against the major external surface of the pouch cell battery.