Method for designing battery module

A method for designing a battery module including a cell assembly in which a plurality of battery cells are stacked and a module case having an internal space in which the cell assembly is accommodated, the method comprising:

• step a) setting a lowermost portion of the module case with respect to a direction of gravity as a design side, and setting a region between the design side and the cell assembly as a design space;
• step b) obtaining a relative permittivity & of the design space satisfying Equation 1
• εrε0A0/T0≤PCy (Equation 1),
• wherein the design space is formed of a film having an area of A0 and a thickness of T0,
• wherein the area of A0 is substantially equal to the area of the lowermost portion of the module case of the battery module,
• wherein Cy is a Y-capacitance value of the battery module and has a value of 1 to 30 nF, P is a real number less than 1, and ε0 is a permittivity of vacuum;
• and
• step c) providing the battery module including the design space having the relative permittivity & obtained in step b).