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.

Abstract: A combined thin battery structure comprises a metallic first plate, a plastic frame, a battery module, and a metallic second plate. The first plate has a plurality of jointing slices and first contacting slices formed upwardly from peripheral edges thereof. The frame has a plurality of jointing grooves and fitting grooves formed from peripheral edges thereof. The jointing slices respectively insert into the jointing grooves. The battery module is fixed in the frame. The second plate has a plurality of fitting slices and second contacting slices formed downwardly from peripheral edges thereof. The fitting slices insert into the fitting grooves. Each of the second contacting slices extends to form a flexible arm. Each of the flexible arms has a contacting surface. The contacting surfaces of the flexible arms contact the first contacting slice via surface contact method thus the first plate electrically contacts the second plate to enhance EMI efficiency.