Cell balancing battery module and electrical apparatus

An electrical apparatus including a cell balancing battery module and an electrical device powered by the cell balancing battery module, the cell balancing battery module comprising:

• a cell string having N cells in series to provide N+1 terminals, N>1, each of the N cells having a port consisting of a positive end and a negative end connected with two adjacent terminals of the N+1 terminals respectively;
• a comparison unit coupled with the N+1 terminals for performing a voltage comparison procedure to find a highest voltage port number and a lowest voltage port number out of the N said ports, the voltage comparison procedure including a plurality of voltage comparison operations using at least one comparison circuit;
• and
• a switching logic and driver unit coupled with the cell string and an inductor, and being configured to select a highest voltage port out of N said ports according to the highest voltage port number to deliver energy to the inductor, and select a lowest voltage port out of N said ports according to the lowest voltage port number to receive energy released from the inductor;
• wherein the voltage comparison procedure further includes:
• finding a highest odd cell and transferring an amount of energy from the highest odd cell into a lowest even cell;
• finding a highest even cell and transferring an amount of energy from the highest even cell into a lowest odd cell;
• and
• repeating the two steps above until all cell voltages are equal.