The present disclosure relates to a battery connection module and a battery device. The battery connection module includes a carrying tray, a plurality of busbars and a flexible circuit board. The plurality of busbars are provided to the carrying tray. The flexible circuit board is provided to the carrying tray and includes a main board body and a plurality of connecting board bodies integrally connected to the main board body in a floatable manner and respectively electrically connected to the plurality of busbars, each connecting board body is provided to a side edge of the main board body, extends in a longitudinal direction and faces the corresponding busbar in a transverse direction, each connecting board body has a central portion and two cantilevered portions respectively extending from two opposite sides of the central portion in the longitudinal direction, each cantilevered portion has a proximal segment connected to the central portion, a distal segment opposite to the proximal segment and a curved segment positioned between the proximal segment and the distal segment, the curved segment extends along at least the longitudinal direction and the transverse direction, each connecting board body is connected to the main board body only by the distal segments of the two cantilevered portions, a gap is formed between the connecting board body and the main board body.