Secondary battery system, controller and control method for secondary battery system, and non-transitory computer readable medium storing program for secondary battery system controller

A controller is configured to control distribution circuits of a plurality of battery modules. A first process determines a supplied power supplied to a heating device of each of the plurality of battery modules so that when at least one of the plurality of battery modules has a higher state of charge (SOC) or a higher amount of charge than other ones, the supplied power to the heating device of the at least one battery module is higher than the other ones.