Abstract: A battery module includes a plurality of battery devices, a circuit board, a control board and a bus wire. The circuit board includes a circuit layout to which a plurality of conductive sheets of the battery devices are electrically connected.

Abstract: The present invention discloses a battery module including a casing capable of supporting a plurality of battery cells and having a circuit board holding structure, a circuit board held by the circuit board holding structure, a plurality of conducting buses disposed on the casing for electrically connecting the plurality of battery cells and the circuit board, and a plurality of battery cell sets, each of which including a battery holder and at least two battery cells, where any two of the plurality of battery cell sets are independent in structure and thereby can be affixed to the casing or detached from the casing respectively.