Electromobile power reduction control method and system based on battery cell open-circuit voltage

Abstract

The invention provides an electromobile power reduction control method based on a battery cell open-circuit voltage. The electromobile power reduction control method based on the battery cell open-circuit voltage includes the steps that the lowest open-circuit voltage Uocv of a battery cell in an electromobile battery pack is detected under different temperatures and different remaining capacities conditions; a power reduction value is determined according to the lowest open-circuit voltage, the remaining capacity and the power reduction value comparison table; and a vehicle controller controls a motor controller to reduce the power of the vehicle according to the determined power reduction value and. On the one hand, the power can be accurately and correspondingly matched according to the battery condition and the power reduction operation of the electromobile can be realized; and on the other hand, the service life of the electromobile battery pack and the service life of a relay can be effectively guaranteed.

Description

technical field [0001] The invention relates to the field of electric vehicles, in particular to an electric vehicle power reduction control method based on the open circuit voltage of a single battery and a control system thereof. Background technique [0002] During the use of electric vehicles, when the power of the battery pack is consumed to a certain extent, continuing to use high power will affect the service life of the battery pack, and over-discharge of the battery pack will affect the service life of the relay. Therefore, when the battery pack After the remaining power is consumed to a certain extent, power reduction is required; in the prior art, the power reduction of the battery pack is based on the overall voltage of the storage battery. This method has the following disadvantages: due to the The characteristics are inconsistent, so the discharge status of each single battery is inconsistent, and the difference in the remaining power of each single battery can...

AI Technical Summary

Problems solved by technology

[0002] During the use of electric vehicles, when the power of the battery pack is consumed to a certain extent, continuing to use high power will affect the service life of the battery pack, and over-discharge of the battery pack will affect the service life of the relay. Therefore, when the battery pack After the remaining power is consumed to a certain extent, power reduction is required; in the prior art, the power reduction of the battery pack is based on the overall voltage of the storage battery. This method has the following disadvantages: due to the The characteristics are inconsistent, so the discharge status of each single battery is inconsistent, and the difference in the remaining power of each single battery cannot be reflected by the overall battery voltage, and based on the above reasons, the relay of the battery pack will be frequently cut off. Thus affecting the service life of the relay

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