Abstract: Embodiments of the invention provide a battery testing system. The battery testing system includes a charger, a discharging unit, and a switch board. The switch board receives a first control signal from the control unit and controls the charger according to the first control signal, receives a first monitoring signal from the charger indicating a charging status of the battery and controls the control unit according to the first monitoring signal, receives a second control signal from the control unit and controls the discharging unit according to the control signal, and receives a second monitoring signal from the discharging unit indicating a discharging status of the battery and controls the control unit according to the second monitoring signal. The control unit is electrically isolated from the discharging unit and the charger by the switch board. Different charging/discharging equipments can be employed to test the battery.

Abstract: Embodiments in accordance with the present invention provide a method for transmitting a data frame between a battery management system (BMS) and an associated device. The battery management system is coupled to an associated device via a one-wire bi-directional communication line. The method includes obtaining a control right of the one-wire bi-directional communication line and determining a target device based on a frame header by sending the frame header of a data frame by a source device; sending a specific data byte of the data frame from the source device to the target device; checking whether an acknowledge character from the target device is received by the source device within a predetermined time period; and releasing the control right of the one-wire bi-directional communication line if the acknowledge character is received within the predetermined time period by the source device or otherwise resending the data frame.