Current calibration coefficient measurement device, measurement method, current detection device and detection method

Abstract

The invention discloses a current calibration coefficient measurement device, a measurement method, a current detection device and a detection method. The measurement device comprises an upper computer and a current source, wherein the current source is serially connected with a shunt of a to-be-calibrated current detection device. The current detection device also comprises a voltage acquisitionunit for acquiring voltage analog signals at two ends of the shunt, a voltage analog-digital conversion unit for carrying out analog-digital conversion on the voltage analog signals to obtain a voltage value and a current calculation unit for calculating a detection current value according to the voltage value and the nominal resistance of the shunt. The upper computer is used for controlling thecurrent source to output current at a specified current value, and according to the specified current value and the detection current value calculated by the current calculation unit, a current calibration coefficient is calculated and obtained. According to the measurement device disclosed in the embodiment of the invention, a brand new current detection device current calibration coefficient measurement scheme is provided, a current calibration basis is provided for current detection by the current detection device, and the current detection precision is improved.

Description

technical field [0001] The invention relates to the technical field of battery pack management, in particular to a current calibration coefficient measurement device and method, and a current detection device and method. Background technique [0002] The replacement of fuel vehicles by electric vehicles has become the development trend of the automobile industry. The mileage, service life and safety of battery packs are all very important for the use of electric vehicles. Therefore, it is necessary to configure a current detection device in the electric vehicle to detect the charging and discharging current value of the battery pack, so as to calculate the state of charge (SOC) of the battery pack, that is, the current available capacity, according to the measured current value. [0003] According to different current measurement principles, the existing power vehicle current detection devices mainly adopt three principles: Hall effect, fluxgate and shunt. Current sensors b...

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Problems solved by technology

[0004] Current measurement based on the shunt is simple to implement, but in the current detection device based on the shunt, an analog-to-digital conversion circuit is required to perform analog-to-digital conversion on the voltage analog signal collected on the shunt, and the conversion process will cause the There is an error between the final voltage value and the actual sampling value, which leads to an error in the measurement result of the current value in the current measurement battery pack, and the measurement accuracy is low. At present, there is no good current measurement device based on the shunt. How to measure and calibrate

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