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.

Abstract: A cooling and heating system includes a battery pack, a temperature sensing module, a semiconductor cooling chip, a current adjustment module, and a control module. The control module controls the current adjustment module to make a current flowed into the semiconductor cooling chip in a first direction, when a temperature of the battery pack is greater than a first reference temperature; and controls the current adjustment module to make the current flowed into the semiconductor cooling chip in a second direction opposite to the first direction, when the temperature of the battery pack is less than a second reference temperature. The battery pack is cooled by the semiconductor cooling chip, when the current flowed into the semiconductor cooling chip is in the first direction. The battery pack is heated by the semiconductor cooling chip, when the current flowed into the semiconductor cooling chip is in the second direction.