A variable SOC charging system and method for electric vehicles

Abstract

The invention discloses a variable SOC charging system and method for electric vehicles, including S1: collecting user habit data to establish an SOC charging upper limit model, thereby determining the SOC charging upper limit; S2: acquiring the state of the battery when the user is waiting to be charged , so as to determine the required charging interval data; S3: Obtain the constant current charging SOC cut-off value according to the required charging interval data; S4: Obtain the charging voltage in the constant voltage charging stage. The present invention automatically meets the user's charging demand by predicting the SOC charging upper limit value, saves the user's manual setting time, and can greatly improve the user experience; obtains the SOC charging upper limit value through prediction, avoiding the full charge of the battery. The impact on the battery life can significantly prolong the battery life; through the battery matching method, it can ensure that the conditions of SOC charging calibration are met, and the accuracy of SOC estimation can be improved, so as to obtain a suitable charging constant voltage and make charging more stable and Safety.

Description

Technical field [0001] The present invention relates to the field of electric vehicle charging technology, and more particularly to a variable SOC charging system and method for electric vehicles. Background technique [0002] With the development of technology, electric vehicles are widely concerned, and their charging function is gradually improved. At present, the existing variable SOC (STATE OF CHARGE, the remaining power) is charged, and the user needs to be manually set, smart, and automation are relatively low during actual implementation, and cannot be adaptively adjusted according to user vehicle habits; And when the user manually sets the charging on the line, the charging demand is that the charging system provides a constant current current to charge the battery, but such a constant current is not conforming to the charging current curve, therefore causes the battery. The power cannot reach the upper limit of the SOC charging. That is, the charging current curve does ...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem that the variable SOC charging used for electric vehicles in the prior art cannot be adaptively adjusted, the present invention proposes a variable SOC charging system and method for electric vehicles, which can be calculated to obtain the charge required by the user during charging. SOC maximum value, and then optimize and adjust the charging current curve according to the SOC maximum value, reduce the SOC estimation error, and then obtain a constant voltage charging voltage to charge the electric vehicle to the SOC maximum value

Images