Method for determining real-time discharge current allowable value of power battery

Abstract

A method for determining a real-time discharge current allowable value of a power battery comprises the following steps: S1, after a battery management system is powered on, the discharge current allowable value is a 30s peak current; s2, when the actual current of the vehicle is larger than the current allowable continuous discharge current value of the power battery and lasts for 30 s, the discharge current allowable value is reduced according to the change rate of 30 A / s until the change rate is reduced to the continuous discharge current value under the current temperature of the battery core and the current charge state; if the variable quantity of the discharge current allowable value is lower than 5A, jumping is directly carried out; s3, when the vehicle speed is reduced, the actual current of the whole vehicle is smaller than 0.7 time of the current allowable continuous discharge current value of the power battery, and the continuous discharge current value lasts for 2 s, the discharge current allowable value directly jumps from the continuous discharge current value to 30 s peak current; and S4, the steps S2 and S3 are circulated until the battery management system BMS is powered off. According to the design, the over-current problem of battery discharge is solved, and the control strategy is simple.

Description

technical field [0001] The invention relates to the technical field of new energy vehicles, in particular to a method for determining the allowable real-time discharge current value of a power battery, which is mainly suitable for solving the problems of battery discharge overcurrent and cumbersome control strategies. Background technique [0002] In recent years, with the vigorous development of domestic new energy vehicles, electric vehicle power batteries have also ushered in a blowout growth. As one of the core components of electric vehicles, the safety performance of the power battery is directly related to the safety of the entire vehicle. If the actual discharge current of the power battery exceeds the allowable value for a long time, not only frequent overcurrent alarms will bring poor user experience, but also damage the battery and cause battery safety accidents. In fact, there are also a large number of battery failure accidents caused by battery discharge overcu...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects and problems of battery discharge overcurrent and cumbersome control strategies in the prior art, and provide a device that can effectively prevent battery discharge overcurrent, and the control strategy is simple to determine the allowable value of the real-time discharge current of the power battery. method

Images