Power battery voltage difference early warning method and system

Abstract

The invention discloses a power battery voltage difference early warning method, which comprises the following steps of: acquiring a charging voltage parameter in real time in a charging state of a power battery of an electric vehicle, and judging that the power battery has a fault when the fluctuation voltage difference of the charging voltage exceeds a set voltage difference threshold value A and the fluctuation duration exceeds a set time threshold value B. According to the invention, the early warning fault is reasonably set after the battery cell characteristics, the use characteristics, the SOC, the temperature, the power and the like of the battery pack are combined and analyzed, so that the problems can be accurately found, the effects of protecting the battery and prompting a customer to maintain the system can be achieved, and the problems of charging, endurance and other user perception problems caused by overlarge voltage difference of the battery cells are reduced.

Description

technical field [0001] The invention relates to the technical field of electric vehicle power battery safety. Background technique [0002] At present, for pure electric vehicles on the market, most of the judgment of the voltage difference between the series cells in the battery pack is to select a larger fault value for judgment, but if the judgment is made according to this set threshold, it is often When the fault comes out, the battery is already in a state that cannot be repaired and needs to be replaced, and in the early use process, the battery often causes serious problems such as less charging and short battery life. Contents of the invention [0003] The invention improves the early warning measures of the pressure difference of the automobile power battery, realizes a method for the early warning of the pressure difference of the power battery, and reduces user perception problems such as charging and battery life caused by excessive battery voltage difference....

AI Technical Summary

Problems solved by technology

[0002] At present, for pure electric vehicles on the market, most of the judgment of the voltage difference between the series cells in the battery pack is to select a larger fault value for judgment, but if the judgment is made according to this set threshold, it is often When the fault comes out, the battery is already in a state that cannot be repaired and needs to be replaced, and in the early stage of use, it often leads to serious problems such as less charging and short battery life due to this battery.

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