A battery rod, an electronic cigarette, and a method for assembling the battery rod, the battery rod comprises a battery casing, a battery, a control module and an end cover; the control module comprises wires and an airflow sensor; the end cover comprises a cover body and a connecting sleeve which is embedded in an elastic installation base; the control module is embedded on the elastic installation base; an outer peripheral surface of the elastic installation base flexibly abuts an inner wall of the connecting sleeve, and an inner peripheral surface of the elastic installation base flexibly abuts an outer peripheral surface of the control module; the wires are flexibly pressed between the control module and the elastic installation base. The elastic installation base is used to ensure the battery rod is airtight and the air flow sensor has a high sensitivity, preventing the wires from damaging the control module.