关键词: 蓄电池内阻, 在线估算, 过零点, 定积分

Abstract: The internal resistance of the battery is one of the most important characteristic parameters of the battery, and it is also an important indicator for evaluating the performance of the battery. In order to solve the problem that the existing measurement methods of battery internal resistance, which can't be measured online and require special equipment measurement, the paper proposes a calculation method for online measurement of battery internal resistance. The method is based on the current and voltage detected by the battery in the process of charge and discharge, according to the characteristic that the current have a zero-crossing in the charge and discharge process, the definite integral of the current is used to counteract the change of the internal resistance of the battery caused by the internal chemical reaction of the battery during the calculation of the internal resistance of the battery, through a series of calculations to estimate the internal resistance of the battery. The battery internal resistance estimation algorithm is written in MATLAB, and the simulation verification is realized. The results show that the calculation method can realize online estimate the internal resistance without the aid of auxiliary equipment and test equipment, it has the advantages of simple and convenient, accurate calculation and easy implementation.

Key words: internal resistance of the battery, estimation online, zero-crossing, definite integral