BATTERY

A battery includes a shell, a cell module, and a circuit board. The shell includes a first housing, a second housing, and a third housing. The cell module includes a plurality of stacked cells. The circuit board is electrically connected to the cell module. The second housing and the first housing close in to form a first cavity. The first cavity is configured to accommodate the cell module. The third housing and the second housing close in to form a second cavity. The second cavity is configured to accommodate the circuit board. Along a stacking direction of the cells, the second housing isolates the cell module from the circuit board. The cell module and the circuit board are disposed in the first cavity and the second cavity respectively. The second housing isolates the circuit board from the cells in the stacking direction of the cells.