METHOD FOR DETERMINING THE RELIABILITY OF STATE OF HEALTH PARAMETER VALUES

摘要

A method is provided for determining the reliability of state of health parameter values for a battery including a plurality of battery cells, the method including the steps of receiving, for a state of health parameter, a plurality of measured parameter values for the battery, comparing the measured parameter values with at least one predetermined parameter criterion; and determining that the measured state of health parameter values are reliable if the state of health parameter values fulfil the at least one predetermined parameter criterion. A corresponding system, computer program, and computer readable medium are also provided.

主权项

1. A method for determining if a reliable state of health for a battery comprising a plurality of battery cells can be calculated, the method comprising the steps of:
calculating a state of charge value for the battery by means of a received measured voltage value and/or a received measured electric current value; comparing the received measured voltage value and/or the received measured electric current value with at least one predetermined parameter criterion for measured voltage and/or measured electrical current; determining that the calculated state of charge value is accurate if the received measured voltage value and/or the received measured electric current value fulfils the at least one predetermined parameter criterion; receiving a measured temperature value of the battery; determining that the measured temperature value is accurate if a difference between the largest temperature of a battery cell and the lowest temperature of a battery cell is within a predetermined range; determining that the measured voltage value is accurate if measured when the absolute value of the derivative function dy/dx is above a predetermined threshold limit, where:y=a measured voltage of the battery; andx=a calculated state of charge of the battery;
determining that the parameters for calculating state of health are accurate if the calculated state of charge, the measured temperature and the measured voltage value are determined accurate; and determining that a reliable state of health can be calculated if the parameters for calculating state of health are determined accurate.