Battery power regulation circuit, regulation method, charging cable and terminal equipment

Disclosed are a battery power supply adjusting circuit and method, a charging cable and a terminal device. The circuit is configured to charge a double-cell battery (), and the circuit comprises a Buck circuit module (), a first charge pump circuit module (), a second charge pump circuit module (), a battery charging and discharging control module () and a system power supply module (); and an input of the Buck circuit module () and an input of the first charge pump circuit module () are externally connected to an AC/DC adapter () respectively, a first output of the Buck circuit module () is connected to the second charge pump circuit module (), a second output of the Buck circuit module () is connected to the system power supply module (), the battery charging and discharging control module () is connected to a controlled end of the Buck circuit module (), a controlled end of the first charge pump circuit module (), a controlled end of the second charge pump circuit module () and the double-cell battery (), the first charge pump circuit module () and the second charge pump circuit module () are respectively connected to the double-cell battery (), and the second charge pump circuit module () is also connected to the system power supply module ().