Battery pack temperature detection circuit fault diagnosis method

Abstract

The invention belongs to the technical field of automobile parts and provides a battery pack temperature detection circuit fault diagnosis method which comprises the following steps: temperature values of all temperature sensors are collected, and temperature values that are greater than a first preset temperature value or smaller than a second preset temperature value are removed; the highest temperature value, the second highest temperature value, the lowest temperature value and the second lowest temperature value are obtained by comparing the remaining temperature values of the temperature sensors; when the difference between the highest temperature value and the second highest temperature value as well as the difference between the lowest temperature value and the second lowest temperature value are smaller than a third preset temperature value, and the temperature change rate of each temperature sensor is smaller than a preset change rate, the highest temperature value and the second highest temperature value are output. According to the battery pack temperature detection circuit fault diagnosis method, by obtaining the difference between the highest temperature value and the second highest temperature value in the temperature values of all the temperature sensors as well as the difference between the lowest temperature value and the second lowest temperature value in the temperature values of all the temperature sensors, whether the temperature sensors which are also called thermistors are micro-short-circuited when connected to the ground or a power source can be determined, and therefore the service life of a single-cell battery and the performance of a whole automobile can be maintained.

Description

technical field [0001] The invention belongs to the technical field of automobile control, and in particular relates to a fault diagnosis method for a battery pack temperature detection circuit. Background technique [0002] Electric vehicles have become the trend of future development. A core component of electric vehicles is the battery pack. In order to detect the temperature of the battery pack, the battery pack is usually connected with a battery pack temperature detection circuit, including multiple thermal sensors connected to different positions of the battery pack. Temperature sensor, if the temperature of the existing battery pack temperature detection circuit is extremely high, it is equivalent to a short circuit between the thermal temperature sensor and the power supply; if the temperature of the thermal temperature sensor is extremely low, it is equivalent to The thermal temperature sensor is shorted to ground, which requires troubleshooting. Usually collect t...

AI Technical Summary

Problems solved by technology

[0003] The existing fault diagnosis only detects the short circuit of the power supply caused by the extremely high or low temperature of the thermistor temperature sensor; however, it cannot detect the micro short circuit of the thermistor to the ground or the power supply, which will lead to thermal loss. Stability false alarms or thermal management malfunctions, which will lead to the life of the single battery attenuation and the performance of the whole vehicle

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