Battery pack and manual service disconnect thereof, battery protection method

A manual service disconnect, wherein the manual service disconnect comprises a base assembly and an upper cover assembly;

• the base assembly comprises a base body, two first high-voltage terminals that are insulated and fixed on the base body, two second high-voltage terminals that are insulated and fixed on the base body, and two first interlocking terminals that are insulated and fixed on the base body;
• the upper cover assembly comprises an upper cover body, two third high-voltage terminals fixed on the upper cover body and corresponding to the two first high-voltage terminals, two fourth high-voltage terminals fixed on the upper cover body and corresponding to the two second high-voltage terminals, and two second interlocking terminals fixed on the upper cover body and corresponding to the two first interlocking terminals, the two third high-voltage terminals are electrically connected, the two fourth high-voltage terminals are electrically connected, and the two second interlocking terminals are electrically connected;
• when the upper cover assembly is engaged with the base assembly, the two first high-voltage terminals are electrically connected through the two third high-voltage terminals, the two second high-voltage terminals are electrically connected through the two fourth high-voltage terminals, and the two first interlocking terminals are electrically connected through the two second interlocking terminals.