REMAINING BATTERY LIFE PREDICTION DEVICE AND BATTERY PACK

摘要

Provided is a low-cost battery pack capable of predicting a remaining battery life of a rechargeable battery with more accuracy while being capable of dealing with a variation in battery characteristics. In a remaining battery life prediction device, a constant current source configured to cause a constant current to flow through a battery as a load current is provided, battery voltages before and after the constant current as the load current is caused to flow through the battery are measured at a plurality of time points, and a battery internal resistance is calculated based on a change over time of the battery voltage.

主权项

1. A remaining battery life prediction device, which is configured to measure a battery voltage of a battery to predict a remaining life of the battery, the remaining battery life prediction device comprising:
a first voltage detection unit configured to measure the battery voltage; a current sensing resistor for sensing a load current flowing through a load; a second voltage detection unit configured to measure a voltage of the current sensing resistor; a calculation control unit configured to perform predictive calculation of a remaining battery life based on the battery voltage and the voltage of the current sensing resistor; and a constant current source configured to selectively cause a constant current to flow through the battery as a load, wherein the calculation control unit is configured to measure the battery voltages before and after the constant current is caused to flow through the battery at at least three time points, and calculate a battery internal resistance based on the measured battery voltages, to thereby predict the remaining life of the battery.