Patent ID: 8488286
Filing Date: 2013-07-16
Classification: H02J

Abstract:
1. An apparatus for an electric power tool comprising: a detection unit that detects at least one physical quantity representing a load condition of a battery as a power source of the electric power tool; a determination unit that determines whether or not the battery has reached an overload state based on the result of the detection by the detection unit; a protection unit that interrupts a discharge path from the battery to thereby protect the battery when the determination unit determines that the battery has reached the overload state; a calculation unit that calculates, based on the result of the detection by the detection unit, a time-equivalent value representing a remaining time until the load condition of the battery reaches the overload state, in which the protection unit interrupts the discharge path; and a notification unit that notifies a user of the electric power tool of a remaining time until the protection unit interrupts the discharge path based on the time-equivalent value calculated by the calculation unit.