NOVELTY - The structure has a battery module which is mounted in internal space of a battery pack. A high power isolating switch (4) isolates a battery high-current circuit in the battery module. A heat regulation unit (3) is mounted in internal space of battery pack case, which produces temperature-controlled air supplied to battery module. Switch is arranged in upper space position, in internal space of battery pack case, among the interior space of battery pack. The heat regulation unit is arranged at a position and overlaps with the switch in vertical direction of vehicle.    USE - Battery pack heat regulation structure of electric vehicle such as sedan type electric vehicle, trolley type electric vehicle and sport utility vehicle (SUV) type electric vehicle. Can also be used in propulsion motor and hybrid electric vehicle.    ADVANTAGE - The high power isolating switch and heat regulation unit can be arranged in the vertical position which overlaps the vehicle up-down direction, and positioned in the interior space of the battery pack case. The required front-back direction dimension of the battery pack case can be increased, when positioning the high power isolating switch and heat regulation unit to the interior space of the battery pack case and heat regulation unit positioned in the vehicle forward position of high power isolating switch. The required vehicle width direction dimension of the battery pack case can be increased, when the heat regulation unit is positioned in the vehicle width direction position of a high power isolating switch, when positioning the electrical component with the battery module inside battery pack case, the high power isolating switch and heat regulation unit, so that the space efficiency within the case can be improved. The increase of the front-back direction case dimension or vehicle width direction case dimension can be suppressed.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of the battery pack.    Heat regulation unit (3)    High power isolating switch (4)    Evaporator (33)    Unit duct (35)    Wide duct portion (93)