A battery pack , comprising: a housing comprising an upper housing and a lower housing assembled at a boundary surface to form an inner cavity; a cell assembly disposed in the inner cavity; a battery pack interface electrically connected to at least the cell assembly; and a circuit board electrically connected to at least the cell assembly and the battery pack interface; wherein the cell assembly comprises: a plurality of cell units ; a positive terminal of the cell assembly connected to at least a positive electrode of one of the plurality of cell units; and a negative terminal of the cell assembly connected to at least a negative electrode of one of the plurality of cell units; wherein the battery pack interface comprises: a positive terminal of the battery pack connected to the positive terminal of the cell assembly; a negative terminal of the battery pack connected to the negative terminal of the cell assembly; and a communication terminal of the battery pack; a first bracket disposed on an upper side of the lower housing and configured to fix the positive terminal of the battery pack and the negative terminal of the battery pack; and a second bracket disposed on an upper side of the circuit board and connected to the circuit board, wherein the second bracket is detachably connected to the first bracket. a housing comprising an upper housing and a lower housing assembled at a boundary surface to form an inner cavity; a cell assembly disposed in the inner cavity; a battery pack interface electrically connected to at least the cell assembly; and a circuit board electrically connected to at least the cell assembly and the battery pack interface; wherein the cell assembly comprises: a plurality of cell units ; a positive terminal of the cell assembly connected to at least a positive electrode of one of the plurality of cell units; and a negative terminal of the cell assembly connected to at least a negative electrode of one of the plurality of cell units; a plurality of cell units ; a positive terminal of the cell assembly connected to at least a positive electrode of one of the plurality of cell units; and a negative terminal of the cell assembly connected to at least a negative electrode of one of the plurality of cell units; wherein the battery pack interface comprises: a positive terminal of the battery pack connected to the positive terminal of the cell assembly; a negative terminal of the battery pack connected to the negative terminal of the cell assembly; and a communication terminal of the battery pack; a first bracket disposed on an upper side of the lower housing and configured to fix the positive terminal of the battery pack and the negative terminal of the battery pack; and a second bracket disposed on an upper side of the circuit board and connected to the circuit board, wherein the second bracket is detachably connected to the first bracket. a positive terminal of the battery pack connected to the positive terminal of the cell assembly; a negative terminal of the battery pack connected to the negative terminal of the cell assembly; and a communication terminal of the battery pack; a first bracket disposed on an upper side of the lower housing and configured to fix the positive terminal of the battery pack and the negative terminal of the battery pack; and a second bracket disposed on an upper side of the circuit board and connected to the circuit board, wherein the second bracket is detachably connected to the first bracket. <EOS>