Method and apparatus for estimating maximum power of battery by using internal resistance of the battery

Abstract

Disclosed is a method for estimating the maximum power of a battery, which can inexpensively perform an estimation of the maximum power of a battery in a relatively simple manner of using the internal resistance of the battery, which has a correlation with and a largest effect on the maximum power of the battery. The method includes the steps of: measuring an internal resistance and a temperature of the battery and estimating a state of charge, if an estimation of the maximum power of the battery is requested; and reading a value of the maximum power of the battery, which corresponds to the measured temperature, the estimated state of charge, and the measured internal resistance, from a table in which the internal resistances and the maximum powers of the battery are mapped according to the temperatures and states of charge.

Description

[0001] This application claims the benefit of the filing date of Korean Patent Application No. 2005-44862, filed on May 27, 2005, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the invention [0003] The present invention relates to a method for estimating the maximum power of a battery for a Hybrid Electric Vehicle (HEV), more particularly to an apparatus and a method for estimating the current maximum power of the battery by using the internal resistance of the battery, one of various environment parameters, which has the greatest effect on the maximum power of the battery mounted on a vehicle. [0004] 2. Description of the Prior Art [0005] Electric vehicles use electric energy stored in a battery as an energy source. Lithium-ion polymer batteries are mainly used as the batteries for the electric vehicles, and researches for the lithium-ion polymer batteries have b...

AI Technical Summary

Benefits of technology

[0011] The present invention can easily and accurately estimate the maximum power of the battery using the internal resistance of the battery as well as various parameters having an effect on the maximum power of the battery.

Problems solved by technology

However, as the maximum power of the battery is sensitively changed according to temperature, the state of charge (SOC), and the state of health (SOH), it cannot be measured directly.

Since the maximum power of the battery has too intensive a nonlinearity, it is impossible to measure the maximum power of the battery directly.

It does not disclose a method for estimating the maximum power of the battery using the internal resistance of the battery, which directly relate to the maximum power of the battery.

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