Energy storage device comprising a housing that accommodates one or more storage cells or storage cell modules, and one or more coolant lines through which a coolant flows that circulates in a coolant circuit; the one or more coolant lines (5) is/are integrated into one or more walls (3) of the housing (2) and extend in an uninterrupted manner at the level of the housing from an inlet port (14) located outside the housing (2) to an outlet port (15) also located outside the housing (2).
