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 (Z) 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 (Z) 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 (X), the two second connecting pieces are spaced apart in a second direction (Y), 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 (Z) 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 (Z) 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 (X), the two second connecting pieces are spaced apart in a second direction (Y), 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 . <EOS>