Current sensor calibration method and electronic equipment for electric vehicle battery management system

Abstract

The invention discloses a current sensor calibration method and electronic equipment of an electric vehicle battery management system. The method includes: using a charger to perform multiple charging calibration detections on the power battery detected by the current sensor, and obtaining the charger obtained by each charging calibration detection. The charging capacity difference between the charging capacity and the charging capacity of the management system; calculate the correction error of multiple charging capacity differences; obtain the credibility of the current sensor current adaptive correction coefficient about the correction error; use the current sensor current adaptive correction coefficient to be credible Correct the current sensor current adaptive correction coefficient; use the current sensor current adaptive correction coefficient to correct the current sensor. In the present invention, under the condition of using less BMS resources, the sampling current of the current sensor is corrected online, so as to improve the ampere-hour integral precision. In the present invention, under the condition of using less BMS resources, the sampling current of the current sensor is corrected online, so as to improve the ampere-hour integral precision.

Description

technical field [0001] The invention relates to the technical field related to electric vehicles, in particular to a current sensor calibration method and electronic equipment of a battery management system of an electric vehicle. Background technique [0002] The charging / discharging capacity is one of the key parameters of the power battery, which is calculated by the Battery Management System (BMS). Currently, the ampere-hour integration method is the main method: ΔQ=∫i*dt. The current of electric vehicles has the characteristics of severe transient changes, and it is inevitable to have errors in sampling the transient currents with current sensors, resulting in the existence and accumulation of ampere-hour integration errors. The current main methods to reduce the current sensor sampling error are: [0003] 1. Improve the accuracy level of the current sensor [0004] Principle: By increasing the sampling frequency and precision of current sensors and other hardware, a ...

AI Technical Summary

Problems solved by technology

[0009] Based on this, it is necessary to provide a current sensor calibration method and electronic equipment for the electric vehicle battery management system in view of the technical problems that the existing current sensor calibration method has low precision and is easy to accumulate errors.

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