Method and device for calibrating temperature collection channel in battery management system

Abstract

The invention provides a method and a device for calibrating a temperature collection channel in a battery management system in one embodiment. The method comprises the following steps: a controller transmits a temperature calibration instruction carrying the signal of a channel calibrated at present and a set resistance value corresponding to a temperature calibration point to an adapter plate; the adapter plate forwards the temperature calibration instruction to a battery management system and a temperature adjustment panel, respectively; the temperature adjustment panel realizes the set resistance value by use of a programmable resistor and transmits the set resistance value to the channel calibrated at present in the battery management system; the battery management system acquires the voltage value of the channel calibrated at present, and saves the sign of the channel calibrated at present, the set resistance value and the voltage value in a correlation manner. According to the method in the embodiment, the controller and the programmable resistor network are used for sequentially and automatically calibrating multiple branches of temperature sensors by use of software, and the process is free from manual operation; the calibration accuracy is high and greatly higher than the NTC accuracy, and the calibration requirements of the BMU temperature collection channel can be completely met.

Description

technical field [0001] The invention relates to the technical field of battery management, in particular to a method and device for calibrating a temperature acquisition channel in a battery management system. Background technique [0002] BMS (BATTERY MANAGEMENT SYSTEM, battery management system) mostly detects battery temperature through NTC (Negative Temperature Coefficient, negative temperature coefficient) thermistor, and this function is usually realized by multiple BMUs. BMUs are mostly hand-crafted in samples and small batches. At this stage, the manufacturing process is often not finalized. Due to the consistency of circuit board manufacturing process, component procurement and PCB (Printed Circuit Board, printed circuit board) placement process For reasons such as these, the deviation of each temperature acquisition channel is relatively large, which seriously affects the temperature-related fault diagnosis functions such as over-temperature protection and battery ...

AI Technical Summary

Problems solved by technology

[0010] The shortcoming of the method for calibrating the temperature acquisition channel in the above-mentioned prior art is: since a set of BMS includes multiple BMUs, one BMU has multiple temperature acquisition channels, and each channel needs to set multiple A temperature calibration point, the existing method of pure manual operation is quite a lot of work, time-consuming and laborious;

[0011] The resolution of the sliding rheostat is limited, and the change is not absolutely linear. It is difficult to adjust some resistance values, and the final output of the sliding rheostat is There is a deviation between the resistance and the desired set resistance value

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