Battery pack and manual service disconnect thereof, battery protection method

A battery pack, a manual service disconnect thereof, and a battery protection method are provided. The manual service disconnect includes a base assembly and an upper cover assembly. The base assembly includes a base body, two first high-voltage terminals that are insulated and fixed on the base body, and two second high-voltage terminals that are insulated and fixed on the base body. The upper cover assembly includes an upper cover body and two third high-voltage terminals fixed on the upper cover body and corresponding to the two first high-voltage terminals, and two fourth high-voltage terminals fixed on the upper cover body and corresponding to the two second high-voltage terminals. The two third high-voltage terminals are electrically connected, and the two fourth high-voltage terminals are electrically connected.