Patent ID: 9186787
Filing Date: 2015-11-17
Classification: B25F,G01K,G01R,H01M,H02J,Y02E

Abstract:
1. An internal temperature estimation unit for battery for electric power tool, which is provided in an apparatus for electric power tool and is configured to read a detected temperature from a temperature detection device that is configured to detect a temperature of a cell of a battery that is a power source of an electric power tool so as to estimate an internal temperature of the battery based on the detected temperature, the unit comprising: an initial-value setting device which is configured to read, when a discharge from the battery is started, the detected temperature from the temperature detection device and to set the detected temperature as an initial value; and a temperature increase amount calculation device which is configured to read, during the discharge from the battery, the detected temperature from the temperature detection device and to calculate a temperature increase amount of the cell of the battery based on a latest value of the read detected temperature and the initial value set by the initial-value setting device, and wherein the internal temperature estimation unit is configured to output the temperature increase amount calculated by the temperature increase amount calculation device, as an estimated value representing the internal temperature of the battery.