The invention provides an FPC board of a battery pack and a battery pack. The FPC board of the battery pack comprises: a body, a first mounting part and a second mounting part, wherein the body is arranged on a module bracket in the battery pack; the first mounting part is arranged on the first end of the body; the second mounting part is disposed on the second end of the body; the first mountingpart is disposed opposite to the second mounting part; the first mounting part and the second mounting part are both provided with mounting slots; in the thickness direction of the first mounting partand the second mounting part, a connecting portion is connected between the two side walls of the mounting slots; the connecting portion is spaced apart from the bottom walls of the mounting slots, and is provided with a nickel piece. Therefore, by disposing the connecting portion in the mounting slots, the influence of the thermal expansion of the battery cell on the soldered portion of the nickel piece on the FPC board can be solved, the reliability of the FPC board can be ensured, and the safety and reliability of the battery pack can be improved. Moreover, it is also possible to reduce the manufacturing material of the FPC board, and to reduce the manufacturing cost of the FPC board.