Battery pack

A battery pack comprising:

• a secondary battery;
• a casing that accommodates the secondary battery;
• a base which is a part of the casing and has a heat dissipation wall and a side wall disposed so as to transfer heat to the heat dissipation wall;
• two fixing portions disposed on the side wall in the base and configured to be fixed to a vehicle-side member, the fixing portions being configured to mount the battery pack to a vehicle having the vehicle-side member;
• two first electrical components disposed so that released heat can be transferred to the heat dissipation wall or the side wall;
• two second electrical components disposed so that released heat can be transferred to the heat dissipation wall or the side wall, the second electrical components each having a smaller heat generation density than both of the first electrical components, each of the first electrical components being disposed closer than both of the second electrical components to one of the fixing portions in planar view;
• and
• two dissipation paths through which the heat transferred from each first electrical component to the heat dissipating wall dissipates to the vehicle-side member through a respective nearest fixing portion,
• wherein neither second electrical component is disposed in one of the heat dissipation paths.