The utility model relates to a storage battery, in particular to a power battery, and solves the problem in the prior art that a power battery is complicated in wiring and assembling due to more components which need to be electrically connected. The power battery provided by the utility model adopts the structure that a placement groove for placing a circuit board is formed in a housing cover. Since most circuits of power batteries in the prior art are printed circuit boards, however, by adopting the power battery provided by the utility model, the circuit board of the power battery can be arranged in the placement groove, the power battery can be assembled so long as a battery cell is arranged in a housing, the circuit board is arranged in the placement groove in the housing cover and the housing cover is closed, so that the assembly process of the power battery is greatly improved, and the maintenance of the power battery is facilitated. The depth of the housing adapts to the placement height of the battery cell, and after the housing cover of the power battery is closed, the battery cell can be fixed through the housing cover, so that the labor intensity of assembly personnel can be lowered.