A battery pack, comprising a fireproof component and a battery module; a fireproof component, wherein the fireproof component comprises a main body and a frame; the frame comprises a body portion, an extension portion, and an opening, an inner peripheral face of the body portion defines the opening, the extension portion is located circumferentially outside the body portion and connected to an outer peripheral face of the body portion, and the extension portion extends along a third direction and protrudes beyond the body portion; the main body covers the opening of the frame and is connected to the body portion; the frame comprises a plurality of connecting pieces, the plurality of connecting pieces are spliced together in tandem, each of the connecting pieces comprises a first plate portion and a second plate portion, and the second plate portion extends along the third direction and protrudes beyond the first plate portion; the first plate portions of all the connecting pieces constitute the body portion of the frame, and the second plate portions of all the connecting pieces constitute the extension portion of the frame; wherein the plurality of connecting pieces comprise two first connecting pieces and two second connecting pieces, the two first connecting pieces are spaced apart in a first direction, the two second connecting pieces are spaced apart in a second direction, and each of the second connecting pieces is connected to the two first connecting pieces; and wherein the main body of the fireproof component and the body portion of the frame are located above the battery module, the extension portion is located circumferentially outside the battery module, and the body portion of the frame is fixedly connected to the battery module. a fireproof component, wherein the fireproof component comprises a main body and a frame; the frame comprises a body portion, an extension portion, and an opening, an inner peripheral face of the body portion defines the opening, the extension portion is located circumferentially outside the body portion and connected to an outer peripheral face of the body portion, and the extension portion extends along a third direction and protrudes beyond the body portion; the main body covers the opening of the frame and is connected to the body portion; the frame comprises a plurality of connecting pieces, the plurality of connecting pieces are spliced together in tandem, each of the connecting pieces comprises a first plate portion and a second plate portion, and the second plate portion extends along the third direction and protrudes beyond the first plate portion; the first plate portions of all the connecting pieces constitute the body portion of the frame, and the second plate portions of all the connecting pieces constitute the extension portion of the frame; wherein the plurality of connecting pieces comprise two first connecting pieces and two second connecting pieces, the two first connecting pieces are spaced apart in a first direction, the two second connecting pieces are spaced apart in a second direction, and each of the second connecting pieces is connected to the two first connecting pieces; and wherein the main body of the fireproof component and the body portion of the frame are located above the battery module, the extension portion is located circumferentially outside the battery module, and the body portion of the frame is fixedly connected to the battery module.