BATTERY MODULE AND CHARGING SYSTEM

Embodiments of this application disclose a battery module and a charging system, to improve a service life and safety of the battery module. Embodiments of this application provide a battery module, where the battery module is configured to discharge to a terminal device, and the battery module includes: a detection and control unit, a buck-boost unit, and a cell pack. The detection and control unit is configured to: receive a terminal-required voltage sent by the terminal device; and control the buck-boost unit to discharge to the terminal device through the cell pack based on the terminal-required voltage. Alternatively, the detection and control unit is configured to: receive a first error reference value sent by the terminal device, where the first error reference value is obtained by the terminal device based on the terminal-required voltage and a load input voltage of the terminal device in a first period; obtain a first target output voltage based on the first error reference value and an output voltage of the buck-boost unit in the first period; and control the buck-boost unit to discharge to the terminal device based on the first target output voltage through the cell pack.