Abstract: A battery module including a battery string and a switch is provided. The battery string includes a first battery, a second battery, a third battery, a first metal plate, and a second metal plate. The first battery includes a first positive terminal and a first negative terminal. The second battery includes a second positive terminal and a second negative terminal. The third battery includes a third positive terminal and a third negative terminal. The first metal plate is connected to the first negative terminal and the second positive terminal. The second metal plate is connected to the second negative terminal and the third positive terminal. The switch is connected to the first or second metal plate.

Abstract: An operation method for a backup power supply of an electronic system is provided. The backup power supply includes a fuse. The operation method includes: estimating a reading voltage error and a resistance of the fuse; reading a real-time battery discharging current; reading and calculating a voltage difference between two terminals of the fuse; and determining whether to send a fuse replacement message to the electronic system according to the voltage difference between the two terminals of the fuse, the reading voltage error, the resistance of the fuse and the real-time battery discharging current.

Abstract: A battery module includes a plurality of battery cores, a plurality of metal sheets, a circuit board and a solder. The metal sheets are electrically connected to the battery cores. Each of the metal sheets includes a metal bump, and the metal bump has an upper surface. The circuit board is disposed on the metal sheets and has a plurality of openings. The openings respectively expose the metal bump of each of the metal sheets. The metal bump divides each of the openings into a first cavity and a second cavity. The solder covers the upper surface of the metal bump of each of the metal sheets and each of the openings. The solder fills the first cavity, and there is an air gap in the second cavity.

Abstract: A battery module including a battery string and a switch is provided. The battery string includes a first battery, a second battery, a third battery, a first metal plate, and a second metal plate. The first battery includes a first positive terminal and a first negative terminal. The second battery includes a second positive terminal and a second negative terminal. The third battery includes a third positive terminal and a third negative terminal. The first metal plate is connected to the first negative terminal and the second positive terminal. The second metal plate is connected to the second negative terminal and the third positive terminal. The switch is connected to the first or second metal plate.

Abstract: An operation method for a backup power supply of an electronic system is provided. The backup power supply includes a fuse. The operation method includes: estimating a reading voltage error and a resistance of the fuse; reading a real-time battery discharging current; reading and calculating a voltage difference between two terminals of the fuse; and determining whether to send a fuse replacement message to the electronic system according to the voltage difference between the two terminals of the fuse, the reading voltage error, the resistance of the fuse and the real-time battery discharging current.

Abstract: A power control circuit and a power control method are provided. The power control circuit includes a battery unit, a power controller and a switch circuit. The power controller is configured to provide a control signal. The switch circuit is coupled between the battery unit and the power controller. The switch circuit includes a diode component. The diode component is configured to receive the control signal. The switch circuit is configured to cut off a power transmission path of the battery unit in response to a voltage difference between a first terminal and a second terminal of the diode component.

Abstract: A power control circuit and a power control method are provided. The power control circuit includes a battery unit, a power controller and a switch circuit. The power controller is configured to provide a control signal. The switch circuit is coupled between the battery unit and the power controller. The switch circuit includes a diode component. The diode component is configured to receive the control signal. The switch circuit is configured to cut off a power transmission path of the battery unit in response to a voltage difference between a first terminal and a second terminal of the diode component.

Abstract: A wearable device includes a touch screen, an acceleration sensor, and a processor in communication with both the touch screen and the acceleration sensor. The processor is configured to determine whether a first action event has occurred with the wearable device by monitoring an output of the acceleration sensor, after determining that the first action event has occurred, determine whether a first touch event has occurred by monitoring whether touch-sensitive areas on the touch screen have been touched in a predetermined sequence, and release a lock state of the wearable device when the first touch event has occurred.