초록 ▼

A battery pack (1) is connected to an external equipment (9) and to a power source circuit (10) designed to supply the power to the external equipment (9). The communication of the information is made between a micro-computer (11) in the battery pack (1) and the external equipment (9) via a terminal

A battery pack (1) is connected to an external equipment (9) and to a power source circuit (10) designed to supply the power to the external equipment (9). The communication of the information is made between a micro-computer (11) in the battery pack (1) and the external equipment (9) via a terminal (8). At least the information indicating the present residual capacity of a battery main unit (4) is transmitted by such communication from the micro-computer (11) to the external equipment (9). The residual capacity is found by the calculations performed by the micro-computer (11) on the current, voltage, internal resistance and the temperature of the battery main unit (4). In this manner, the residual capacity may be accurately found on the side of the external equipment (9).

대표청구항 ▼

A battery pack connected to a power source circuit and to external equipment which may also be connected to said power source circuit, wherein said power source circuit and said external equipment may be switched on and off, said battery pack comprises a secondary battery which may be charged and di

A battery pack connected to a power source circuit and to external equipment which may also be connected to said power source circuit, wherein said power source circuit and said external equipment may be switched on and off, said battery pack comprises a secondary battery which may be charged and discharged and a control circuit for controlling the charging and discharging of said secondary battery, said control circuit comprises; means for detecting the status of the secondary battery, means for transmitting information based on the status of the secondary battery, means for detecting the status of said power source circuit and said external equipment, and means for controlling said charging and discharging of said secondary battery in response to the detected status of said power source circuit and said external equipment.