NOVELTY - A battery apparatus comprises heat absorbing body, casing (10), cell (20), and heat absorbing body (30). The casing has hollow containing space (13) disposed inside, and an anode (14) and a cathode (15) disposed outside the casing. The cell is installed in the containing space. The cell has anode and cathode handles coupled to the anode and the cathode respectively. The heat absorbing body is installed in the containing space. The heat absorbing body has an end attached onto an end surface of the cell.    USE - The battery apparatus is useful for supplying power for various different appliances.    ADVANTAGE - The battery apparatus allows operation to be maintained at permitted operating temperature and extends life of use of battery apparatus. The apparatus does not cause corrosion or electric conduction problems to the cells since the phase change material is sealed between the two soft films and selectively installed at high-heat area according at high-heat area according to the actual heat dissipating requirements of battery apparatus to achieve the best heat dissipating performance.    DETAILED DESCRIPTION - A battery apparatus comprises heat absorbing body, casing, cell, and heat absorbing body. The casing has hollow containing space disposed inside, and an anode and a cathode disposed outside the casing. The cell is installed in the containing space. The cell has anode and cathode handles coupled to the anode and the cathode respectively. The heat absorbing body is installed in the containing space. The heat absorbing body has an end attached onto an end surface of the cell. The heat absorbing body includes upper and lower soft films, and phase change material. The lower soft film is sealed with the upper soft film. The phase change material is filled between two soft films for absorbing or releasing heat produced or required by the cell. The casing includes two casing panels coupled to a side of the upper casing panel. The containing space is formed between two casing panels. The upper casing panel includes the anode and the cathode disposed at an exterior of the upper casing panel. The cell is lithium-ion battery or polymer lithium battery. The two soft films include partition bars disposed between them and non-interconnected blocks divided by the heat absorbing body. The phase change material is sodium silicate, sodium borate, sodium sulfate, and/or paraffin. The sodium sulfate mixture is made of water, sodium sulfate, bentonite clay powder or attapulgite clay. The two soft films are metal foils. The heat absorbing body includes a porous tissue sealed and fixed inside the two soft films. The porous tissue is a sponge or an unwoven cloth.    DESCRIPTION OF DRAWING(S) - The figure shows cross sectional view of battery apparatus.    Casing (10)    Casing panel (11, 12)    Hollow containing space (13)    Anode (14)    Cathode (15)    Cell (20)    Heat absorbing body (30)