Abstract: A power battery assembly includes a number of single batteries having a first end and a second end, a number of printed circuit boards, a current collecting board, an anode electrode board, and a cathode electrode board. The single batteries are arranged in a first half comprising several first groups and a second half comprising several second groups. The first end of the single battery of the first half is opposite to the first end of the single battery of the second half. Each printed circuit board is positioned between two neighbored first middle groups and two neighbored second group. The anode electrode board and the cathode electrode board and is positioned at the same side of the power battery assembly, the current collecting board is positioned opposite to the anode electrode board and the cathode electrode board and connects the first groups and the second groups in series.