Abstract: The present invention provides a protection circuit applied to a battery module, which includes a self-control protector, a switch element and a voltage clamping loop; the self-control protector includes a fuse unit and a heater; when the switch element receives a control signal, the switch element will be turned on; when the switch element is turned on, the voltage clamping loop provides a clamp voltage to clamp a working current passing through the self-control protector within a current range where the fuse unit can be blown; and as such, the fuse unit of the self-control protector will be blown by the working current heating the heater.

Abstract: This disclosure provides a battery management system. The battery management system comprises a buck converter, a discharge loop, and a microprocessor. The microprocessor comprises a battery status monitoring circuit, a timer, and a controller. When the status of the battery is in a static state, the timer starts counting a time. If the time counted by the timer is greater than or equal to a time threshold, the controller controls that the buck converter executes a bucking to an output voltage of the battery, and then controls that the discharge loop executes a discharging to the battery. Accordingly, when the status of the battery is in a static state, the battery capacity can be discharged to a safe value moderately, so that the safety of the long-storage of the battery can be ensured, and the life of the battery can be prolonged.

Abstract: A circuit board assembly includes a substrate, a flexible printed circuit board and an electrical component. The substrate includes a first electrically connecting port. The flexible printed circuit board includes a main body and a branch body. The main body includes two second electrically connecting ports opposite to each other. One of the two second electrically connecting ports is electrically connected to the first electrically connecting port. One end of the branch body is connected to the main body. Another end of the branch body is disposed with an additional electrically connecting port. The electrical component is disposed on and electrically connected to the additional electrically connecting port. The electrical component is electrically connected to the substrate via the flexible printed circuit board.