NOVELTY - The battery has battery housing with an opening end. A battery cover seals the opening end. An electric core received in the battery housing has a positive heat-conducting element (1) and a negative heat-conducting element that are electrically insulated from each other. Each heat-conducting element has an end penetrating through the battery cover respectively. An electrolyte is filled in a space formed by the battery housing with the battery cover. Each heat-conducting element is formed with projections on an external surface for heat dissipation.    USE - Battery for use in electrical vehicle (EV) and hybrid electrical vehicle (HEV).    ADVANTAGE - The battery core has heat-conducting element which can adjust the internal temperature of the battery core. The heat-conducting elements can transfer the internal heat in the battery core and cool the battery quickly, when the internal temperature of the battery core rises quickly or the battery is in an extreme thermal environment, so that the thermal reaction of substances in the electrodes is prevented, and the potential safety risks such as explosion caused by heat accumulation and slow heat dissipation are avoided, and the safety of the battery is enhanced. The heat-conducting element can ensure the internal temperature consistency of the battery, so that the battery always works in a superior state to enhance the cycling performance of the battery. Therefore, the temperature balance of positive and negative electrodes of the battery can be ensured. The heat-conducting element located in the battery core can function as a support and a backbone for stably holding the electric core, so that the assembling of the battery is simplified. The winding of the electric core is facilitated, so that the winding compactness of the electric core is increased, and damage to the battery or a battery pack resulting from loosening and deformation of the battery core caused by bumpiness and shake of the battery when the battery is moved, is prevented.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of electric core in battery.    Positive heat-conducting element (1)    Electrical connecting elements (8)    Connectors (71,72)