BATTERY PACK

Embodiments of the present application provide a battery pack, comprising: a housing; a built-in circuit located in the housing; a fragile component located in the housing and connected in series with the built-in circuit, the housing being provided with an opening corresponding to the fragile component; a safety switch located in the housing, on-off of the built-in circuit being controlled by means of on-off of the safety switch; and a cover provided corresponding to the opening, the cover comprising a first state and a second state, wherein in the first state, the cover covers the opening and the safety switch is closed, so that the built-in circuit is connected, and in the second state, the cover is separated from the opening and the safety switch is turned off, so that the built-in circuit is disconnected. In the embodiments, the cover covers the opening, and the battery pack is well sealed, so that the battery pack can be used normally, thereby avoiding a safety accident caused by seal failure during use