SOC compensation method for power battery

Abstract

The invention discloses an SOC (State Of Charge) compensation method for a power battery. The method comprises the following steps: after a vehicle is powered on, acquiring a power-off SOC at the previous power-off moment and using the power-off SOC as the current power-on SOC; determining whether the condition of correcting an open-circuit voltage is met; if meeting the condition of correcting the open-circuit voltage, inquiring an OCV-SOC parameter relation table, thereby acquiring a corrected SOC; using a difference of the power-on SOC and the corrected SOC as a to-be-compensated SOC; in a running process of the vehicle, calculating the current SOC according to an ampere-hour integral method and compensating for an SOC value for the current SOC on the basis of driving mileage according to the to-be-compensated SOC till completing the SOC value compensation or the power-off of the vehicle; when the vehicle is powered off, storing the current SOC as the power-off SOC at the power-off moment. According to the invention, the accuracy of the SOC value is guaranteed and the problem of inconsistency of the power-off SOC and the power-on SOC is solved, so that the SOC value jump phenomenon can be avoided and the driving experience can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of batteries for new energy vehicles, in particular to an SOC compensation method for power batteries. Background technique [0002] As the problem of environmental pollution becomes more and more serious, energy-saving and environmentally friendly new energy vehicles have gradually become popular. Generally speaking, as the main energy source of new energy vehicles, the characteristics and functions of power batteries are particularly important. The state of charge SOC (state of charge) is a key parameter of the power battery. It is usually used to indicate the remaining power of the battery. An accurate SOC value can help the vehicle system to estimate the accurate remaining mileage of the vehicle and the battery's capacity. status of use. However, unlike the remaining fuel of traditional fuel vehicles, new energy vehicles can be directly calculated more accurately through physical quantities. Auxiliary...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide an SOC compensation method for a power battery, which solves the problem of inconsistency between the power-off SOC and the power-on SOC on the premise of ensuring accurate SOC estimation

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