NOVELTY - The pack (100) has a pack case unit covered with outer sides of multiple battery modules (102a-102d). The battery modules are fixed with multiple battery cells (104) for charging/discharging the battery cells. Heat is removed from the battery cells for cooling of the pack case unit. The battery cells are fixed with a module case unit. A cooling pin is interposed among the battery cells. A fin unit is directly contacted with the pack case unit. A thermal-conductive pad is made of silicone material and urethane material. A sealing unit (107) is combined with two case parts (110, 112).    USE - Battery pack for a vehicle e.g. electric vehicle, hybrid electric vehicle and plug-in hybrid electric vehicle, and a power storage system (all claimed).    ADVANTAGE - The battery modules are fixed with the battery cells so as to effectively charge/discharge the battery cells. The pack is effectively operated with an engine according to running condition so as to reduce fuel consumption and improve operation effectiveness. The battery cells are fixed with a cooling system that cools the battery modules so as to avoid generation of heat of a battery and improve power capacity of the battery during rechargeable procedure. The pack ensures that joint parts are fixed in a fluid path for flowing liquid coolant in a battery pack internal space so as to reduce the joint parts from being damaged. The pack ensures that a wire and a connector are fixed in the battery pack internal space so as to prevent dielectric breakdown and short circuit from being generated and improve safety about liquid coolant outflow of a refrigerant outlet. The pack is simple to manufacture, and has low management cost.    DETAILED DESCRIPTION - The pack case unit is made of high thermally conductive material i.e. metal material, that comprises thermal compound thermal grease, thermal conductance polymer and thermal conductance polymer composite. The sealing unit is made of rubber and silicone materials. The battery cell is a lithium battery.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of a battery pack.    Battery pack (100)    Battery modules (102a-102d)    Battery cells (104)    Sealing unit (107)    Case parts (110, 112)