METHOD AND APPARATUS OF DETECTING STATES OF BATTERY

摘要

A method and apparatus of detecting the states of a battery involve passing test-oriented charging and discharging pulse pair to a battery under test, and retrieving parameters of the battery, such as voltage, current, and temperature, which respond to the charging and discharging pulse pair, so as to estimate the battery states. The battery states include information pertaining to open-circuit voltage, internal resistance, capacitance, state of charge, and state of health of the battery. The battery state-related information is conducive to quick battery state detection and grading.

主权项

1. A method of detecting states of a battery, comprising the steps of:
setting control parameters of a charging and discharging pulse pair test, wherein the control parameters include charging pulse current, discharging pulse current, charging pulse time width, discharging pulse time width, open-circuit time width, and the number of charging and discharging pulse pairs; performing a charging and discharging pulse pair test on the battery; measuring pulse response parameters of the battery, wherein the pulse response parameters include maximum voltage of charging pulse, minimum voltage of discharging pulse, OCV of charging pulse, OCV of discharging pulse, and temperature; calculating average voltage parameters, wherein the average voltage parameters include average maximum voltage of charging pulse, average minimum voltage of discharging pulse, and average OCV; calculating average voltage differences of charging pulses and discharging pulses and state of charge (SOC); calculating charging and discharging internal resistance; calculating a charging internal resistance-related SOH index and a discharging internal resistance-related SOH index; calculating actual charging and discharging capacity, charging the battery fully when the battery is brand-new, performing a discharging and charging test in a constant current-constant voltage mode to create a charging and discharging database of the battery, followed by substituting measured average voltage differences of charging pulses and discharging pulses and a state of charge (SOC) into the charging and discharging database to figure out actual charging capacity and actual discharging capacity of the battery; calculating a charging capacity-related SOH index and a discharging capacity-related SOH index; and figuring out an overall battery health status index, wherein the overall battery health status index equals the least one of the charging internal resistance-related SOH index, discharging internal resistance-related SOH index, charging capacity-related SOH index, and discharging capacity-related SOH index.