KR970002338A - Battery remaining capacity measuring method and device - Google Patents

Abstract

The present invention relates to a method and apparatus for measuring a battery remaining capacity, and in a system using a secondary battery as a main power source, measuring the open circuit voltage of a battery after performing temperature compensation for an ambient temperature variation of a battery to be measured. By calculating the remaining capacity of the battery, not only can the accuracy of the calculation be improved, but also the inefficiency such as unnecessarily recharging the user unnecessarily if the remaining capacity is not known.

Description

Battery remaining capacity measuring method and device

Since this is an open matter, no full text was included.

1 is a graph showing the relationship between the open circuit voltage and the remaining capacity of the lead acid battery, 2 is a graph showing the relationship between the open circuit voltage and the temperature of the lead acid battery, and FIG. 3 is a configuration of the battery remaining capacity measuring apparatus according to the present invention Block diagram shown.

Claims (5)

A sensing step of sensing a voltage and temperature of a battery to be measured for remaining capacity and a temperature of a controller; A temperature compensation step of performing temperature compensation on the temperature of the controller detected in the sensing step; A first correction step of correcting the battery voltage and the battery temperature detected in the sensing step by the temperature of the temperature compensated controller; An analog / digital conversion step of analog-to-digital conversion of the battery voltage and the battery temperature corrected in the first correction step; A second correction step of correcting the open circuit voltage of the battery from the temperature-compensated digital battery voltage and the battery temperature converted in the analog / digital conversion step; And a remaining capacity calculating step of calculating a remaining capacity of the battery using the corrected open circuit voltage. 2. The open circuit voltage corrected in the second calibration step includes a reference between the 25-degree reference temperature and the current temperature with respect to the open-circuit voltage which decreases 0.00086V whenever the temperature decreases by 1 degree with a 25-degree reference. A method for measuring battery remaining capacity, which is obtained by multiplying 0.00086V by the difference and adding this value to the current open circuit voltage. The method according to claim 1, wherein the method is performed every time the system on which the battery remaining capacity measuring device is mounted is started for the first time to present a new current remaining capacity reference value. A first sensor sensing a voltage of a battery to calculate a remaining capacity; A second sensor for sensing a temperature of the battery; A third sensor for sensing a temperature of the controller; A temperature compensator for performing thermal compensation on the controller temperature output from the third sensor to provide thermal stability to the input processor; An input processor configured to adjust a level in a range that can be changed analog / digitally after correcting battery voltages and battery temperatures output from the first and second sensors by the temperature compensated controller; An analog / digital converter for converting a battery voltage and a battery temperature of which the level is adjusted in the input processor into a digital value; A microprocessor for calculating a battery remaining capacity from the temperature-compensated digital battery voltage and the battery temperature output from the analog / digital converter; And a display unit for displaying the battery remaining capacity value calculated by the microprocessor to the outside. The apparatus of claim 4, wherein the apparatus further comprises a nonvolatile RAM for storing a battery remaining capacity value calculated by the microprocessor. ※ Note: The disclosure is based on the initial application.