Patent ID: 8089247

Claim:
A power autonomous portable electric tool set, comprising: a first sub-unit generating a mechanical operation of a tool comprising an electric actuator; a portable second sub-unit forming an electric energy source of the set comprising a battery and at least one electric or electronic module located in a vicinity of the battery for at least one of controlling and managing the battery; a third charger sub-unit for electrically recharging the battery comprising at least one electric supply source, wherein the third charger sub-unit adapts a voltage and a current of the at least one electric supply source to recharge the battery; and a cutoff device structured and arranged to cutoff an electric supply of the electric actuator, wherein the first sub-unit is electrically disconnectably connectable to the second sub-unit, wherein the third sub-unit is electrically disconnectably connectable to the second sub-unit, wherein the battery comprises one of a rechargeable electrochemical lithium-ion or rechargeable electrochemical lithium polymer battery, wherein at least one of the at least one electric or electronic module and the cutoff device are operable to prevent overcharging of the battery during a charging phase, wherein the at least one of the at least one electric or electronic module and the cutoff device are operable to prevent over-discharging of the battery during operation of the tool, wherein the at least one of the at least one electric or electronic module and the cutoff device are operable to protect the battery against excess current during a discharging phase, wherein the at least one of the at least one electric or electronic module and the cutoff device are operable to interrupt the discharging phase to turn off the tool, when at least one cell of the battery reaches a threshold minimum voltage recommended by a manufacturer of the battery, and wherein the protecting against excess current protects the battery from premature aging or from overheating during a discharging of the battery during use of the tool and comprises: the at least one of the at least one electric or electronic module and the cutoff device cutting off a discharging current in a case of at least one of a very substantial pulsed overload of a maximum discharging current allowed for the battery and an excess of a maximum temperature allowed for the battery; and limiting the discharging current as a function of an energy consumed by the tool during a certain sliding time period.