The invention discloses a control and protection circuit for a single-
lithium battery electric tool and a detection and control method for the control and protection circuit. The control and protection circuit comprises a singlechip power supply circuit, a battery charging and discharging
voltage detection circuit, a battery charging and discharging temperature detection circuit, a battery charging control management circuit, a motor switching and commutation
control circuit and a working state indication circuit. A singlechip is used as a master control
integrated circuit (IC), and is matched with simple
peripheral components to realize all functions of protecting and controlling the single-
lithium battery electric tool, so that the functions are flexibly designed,
circuit complexity is lowered, the number of electronic components is decreased, cost is lowered, and the circuit is high in safety and reliability, and is almost
power consumption-free when not working, and has the advantages of environment friendliness, energy saving, lightweight, convenience for use, high operation efficiency, long cycle life of a battery, and the like.