Patent ID: 9553469
Date: 2017-01-24
CPC Classifications: H02J

Claim:
1. A method of correcting an overcurrent detection voltage of a battery protection integrated circuit including a current path between a first terminal and a second terminal, one or more transistors connected in series in the current path for controlling current of a secondary battery, an overcurrent detection circuit configured to monitor a relation of magnitude between a current path voltage and an overcurrent detection voltage set for detecting overcurrent of the secondary battery, the current path voltage being a voltage between the first terminal and the second terminal during an on state of the one or more transistors, and a control circuit configured to turn off the one or more transistors upon the overcurrent detection circuit detecting that the relation of magnitude is inverted, the method comprising the steps of: measuring a resistance value between the first terminal and the second terminal while the one or more transistors are turned on at a predetermined temperature; estimating resistance values between the first terminal and the second terminal at respective temperatures based on the measured resistance value; calculating adjusting data for canceling temperature dependency of charge or discharge current of the secondary battery based on the measured resistance value and the estimated resistance values, wherein a value of the charge or discharge current varies depending on temperature; correcting the overcurrent detection voltage based on the calculated adjusting data.