Patent ID: 9007030
Filing Date: 2015-04-14
Classification: B60L,G01R,H01M,Y02E,Y02T

Abstract:
1. A method of estimating battery remaining power in electric vehicles, comprising steps of: a first battery power measuring unit obtaining battery remaining power in electric vehicles using coulometric detection method; a second battery power measuring unit obtaining modified battery power using open voltage estimation method; a first modifying unit using said modified battery power to modify said battery remaining power when the battery rests for a certain period of time and battery power difference exists between the battery remaining power and modified battery power; and a second modifying unit utilizing open voltage estimation method to modify coulometric detection method that has accumulating errors to increase precision of coulometric detection method in dynamic measurement, wherein the open voltage estimation method is a modified open voltage method, the method comprising steps of: estimating voltage of a plurality of batteries; selecting a relatively stable sample range among the batteries; weighing, averaging the batteries in the sample range and multiplying total number of batteries; and comparing battery characteristic curves to obtain modified battery power, wherein when the battery is charged for a longer period of time, the modified open voltage method conducts dispersion degree detection, and when a detection value is larger than a preset value, a self-adjusting mechanism is activated to modify the battery power, wherein the dispersion degree detection includes steps of calculating an average power value of all batteries, obtaining the detection value by subtracting each battery power and then adding them altogether, and adjusting the modified open voltage curve when the detection value is larger than the preset value, wherein the dispersion degree detection includes steps of setting a voltage range; gathering statistics regarding batteries not in the voltage range; determining the preset value according to the statistics; and adjusting the modified open voltage curve when the detection value is larger than the preset value.