The invention includes a heating assembly, a heating device and an auxiliary cooling module for a battery. The heating assembly is connected to a battery and includes a heat-conducting element and a heating element. The heat-conducting element has at least one heat-absorbing portion and at least one heat-conducting portion. The heat-conducting portion is provided to correspond to the battery. The heating element has at least one first heating portion located to correspond to the heat-absorbing portion for heating the heat-absorbing portion. The other side of the heat-conducting element opposite to the battery is provided with a heat-insulating portion. The auxiliary cooling module is further provided with at least one cooling pipe in the heat-conducting element, thereby cooling the battery. With the heating assembly, the heating device, and the auxiliary cooling module of the present invention, the battery can be kept in a normal range of working temperature, so that the efficiency and lifetime of the battery can be increased greatly.