A method and device for calculating the internal resistance of a battery

Abstract

The embodiment of the present application discloses a method and device for calculating the internal resistance of a battery. During the use of the battery, the current difference and voltage difference between the first moment and the second moment of the battery can be collected first; , the voltage difference and the internal resistance value at the first moment, and calculate the current corrected internal resistance value; use the current corrected internal resistance value to correct the internal resistance value at the first moment, and obtain the internal resistance value at the second moment. In this way, there is no need to regard the internal resistance value calculated offline as the constant internal resistance value of the battery for a period of time. By accurately calculating the internal resistance value at any time during the use of the battery, the user can Understand the condition of the battery and make a better battery management strategy in order to improve the service life of the battery.

Description

technical field [0001] The present application relates to the field of battery technology, in particular to a method and device for calculating the internal resistance of a battery. Background technique [0002] As a source of energy, the performance of the battery directly affects the performance of the system (such as a car) using the battery. For a battery, the internal resistance of the battery refers to the resistance of the current flowing through the battery when the battery is working. It is an important indicator of battery performance. Therefore, it is necessary to estimate the internal resistance of the battery to know the performance of the battery. [0003] At present, the methods for estimating the internal resistance of the battery include: using the Hybrid Pulse Power Characteristic (English: HybridPulse Power Characteristic, HPPC for short) experimental method, first calculating the voltage between the steady-state voltage of the pulse charge and discharge a...

AI Technical Summary

Problems solved by technology

This method can only calculate the internal resistance of the battery when the battery is offline

Moreover, other battery internal resistance estimation methods cannot estimate the battery internal resistance in real time, and use an offline internal resistance value to represent the internal resistance value of a certain stage of the battery

[0004] However, it is not conducive to the evaluation and management of battery performance by using the estimation of the internal resistance of a certain offline battery as the constant internal resistance of the battery until the next offline estimation. Therefore, in order to allow users to better understand the battery The state of health, state of charge, etc., in order to better manage the battery and prolong the service life of the battery. The goal is to provide a method that can accurately calculate the internal resistance of the battery online.

Images