a circuit substrate module and a battery module using the circuit substrate module are disclosed . the battery module includes : a plurality of battery units , wherein each battery unit comprises a plurality of battery cells , a case for accommodating the plurality of battery cells , a plurality of electrode terminals , and a plurality of communication connectors coupled to the battery cells and protruding out of the case ; a circuit substrate module mounted on the plurality of battery units and comprising a circuit substrate , wherein a plurality of circuit substrate connectors are coupled to the plurality of communication connectors , wherein the plurality of circuit substrate connectors are coupled to a single external connector that is configured to be coupled to an external device .