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

Abstract

The invention discloses a current sensor calibration method for an electric vehicle battery management system and an electronic device. The method comprises: carrying out multi-times charging correction detection on a power battery detected by a current sensor by using a charging machine and acquiring a charging capacity difference value between a charging machine charging capacity obtained by charging correction detection every time and a management system charging capacity; calculating a correction error of a plurality of charging capacity difference values; acquiring current sensor currentadaptive correction coefficient reliability of the correction error; correcting a current sensor current adaptive correction coefficient by using the current sensor current adaptive correction coefficient reliability; and correcting a current sensor by using the current sensor current adaptive correction coefficient. According to the invention, on-line correction of the current sensor sampling current is realized under the condition of a few of BMS resources, so that the ampere-hour integration accuracy is improved. Therefore, the on-line correction of the current sensor sampling current is realized under the condition of a few of BMS resources, so that the ampere-hour integration accuracy is improved.

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 ...

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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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