Method and apparatus for correcting estimated value of remaining capacity of battery

Abstract

The present invention provides a method and apparatus for correcting the estimated value of the remaining capacity of a battery and belongs to the battery management field. With the method and apparatus adopted, the problem of the inaccuracy of the estimation of the remaining capacity of a battery can be solved. The method includes the following steps that: when the battery is in a discharge state of specified operating current, the current remaining capacity estimated value and the current voltage value of the battery are obtained; a corresponding remaining capacity estimated value on a specific open-circuit voltage-remaining capacity curve is determined according to the current voltage value of the battery; the difference value of the current remaining capacity estimated value and the corresponding remaining capacity estimated value on the curve is calculated, and a correction factor is determined; a correlation value is determined according to a function relationship between the correction factor and correlation parameters; and the current remaining capacity estimated value is corrected according to a large value selected from the correlation value, the current remaining capacity estimated value and the corresponding remaining capacity estimated value on the curve. The method and apparatus provided by the embodiments of the invention are suitable for the estimation process of the remaining capacity of the battery.

Description

[0001] 【Technical field】 [0002] The invention relates to the field of battery management, in particular to a method and device for correcting an estimated value of remaining battery power. [0003] 【Background technique】 [0004] The State of Charge (SOC) is an important parameter describing the current state of the battery and plays an important role in the field of battery management. Accurate SOC estimation can ensure the normal and effective operation of the battery application system and prevent the battery from being overcharged or overdischarged, thereby ensuring the safety of the battery and ensuring the utilization rate and service life of the battery. Therefore, obtaining an accurate SOC has become one of the most important tasks of the current battery management system. [0005] At present, the commonly used method for SOC estimation is the method of combining the ampere-hour integral method and the open circuit voltage method, that is, the two methods are used at...

AI Technical Summary

Problems solved by technology

The open-circuit voltage method and the ampere-hour integration method can achieve a correct estimation of the SOC to a certain extent, but as the operating current and temperature of the battery change, in a short period of time, the SOC value obtained at this moment may be different from the The SOC value obtained at the last moment is very different, which is the so-called SOC jump, which leads to SOC estimation errors

[0006] This estimation error problem caused by SOC jump indicates that the existing SOC estimation method has certain defects, and the displayed SOC estimation value is quite different from the actual value, which loses the guiding significance and cannot effectively help users make a decision. The correct judgment of when to stop using the battery and charge it, and the wrong judgment of the battery SOC can easily lead to safety accidents

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