Method and system for detecting abnormal operation of power battery

Abstract

The invention provides a method and a system for detecting abnormal work of a power battery. The method comprises steps of an average calorific value acquisition step, calculating an average calorificvalue of the power battery from a first moment to a second moment; a calorific value limit value obtaining step, obtaining a calorific value limit value of the power battery in the life cycle; and adecision step, judging whether the calorific value limit value is greater than or equal to the average calorific value, if so, indicating that the power battery works normally, if not, indicating thatthe power battery works abnormally. The method is advantaged in that a detection dead angle problem that in the prior art, the battery is in an abnormal state, but the battery does not reach a temperature abnormal threshold due to good thermal management performance, and an alarm is not given is effectively solved.

Description

technical field [0001] The invention relates to the technical field of electric vehicle power batteries, in particular to a method and system for detecting abnormal operation of power batteries. Background technique [0002] With the development of automobile technology, the share of electric vehicles in vehicles is getting higher and higher, and electric vehicles are powered by batteries. In order to ensure that the power batteries in new energy vehicles can provide and store energy in the best state, it is necessary to The battery status information (including voltage, current, temperature and heat) in the use state is detected to determine whether the power battery is abnormal. [0003] In the prior art, the method of directly detecting the voltage, current and battery body temperature is usually used, and whether the battery is abnormal is judged according to whether the detected value exceeds a predetermined threshold. The thermal management performance of the battery ...

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Problems solved by technology

[0003] In the prior art, the method of directly detecting the voltage, current and battery body temperature is usually used, and whether the battery is abnormal is judged according to whether the detected value exceeds a predetermined threshold. The thermal management performance of the battery is good, and the battery will not show signs of overheating at this time. If the temperature is still used as the judgment condition, it is easy to miss the best time to alarm, and the power battery cannot be used efficiently and safely, and even pose a threat to the safety of the driver. threaten

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