Dump energy calculating device for battery

Abstract

The apparatus to calculate remaining capacity of a battery is provided with a current detection section to detect current flow in the battery, a remaining capacity calculation section to integrate the current value detected by the current detection section and calculate remaining capacity, and a memory section to store discharge current within a specified current range. When current detected by the current detection section is in a specified range, the remaining capacity calculation section uses current values stored in the memory section, rather than values detected by the current detection section, as discharge current to calculate remaining capacity.

Description

technical field [0001] The present invention relates to a remaining capacity calculation device for calculating the remaining capacity of a battery by detecting battery current. Background technique [0002] The remaining capacity of the battery can be calculated by subtracting the discharge capacity from the charge capacity. The charging capacity is calculated by accumulating the charging current, and the discharging capacity is calculated by accumulating the discharging current. Therefore, it is necessary to detect the charging current and discharging current of the battery and perform calculations. In a conventional remaining capacity calculation device, a current detection unit detects a current, and integrates the detected current value to calculate the remaining capacity. [0003] [Patent Document 1] Japanese Unexamined Patent Publication No. 10-274670 [0004] In the conventional device that calculates the remaining capacity by integrating the current values ​​dete...

AI Technical Summary

Problems solved by technology

But the disadvantage is that the more digits of the A / D converter, the higher the cost

Assuming that a 10-bit A / D converter is used to convert the output of the current detection part into a digital value, there is also a measurement error in the current detection part itself, and this error will also cause abnormal calculation of the remaining capacity.

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