Method for initializing SOC acknowledging time based on OCV

Abstract

The invention discloses a method for initializing the SOC acknowledging time based on the OCV. The method includes the following steps: S1: discharging a constant current of a battery pack, performingstanding fully, recording a voltage change throughout the whole process, and determining the change rate of the voltage; S2: initializing the SOC according to the OCV when the change rate of the voltage reaches a predetermined value; S3: performing instantaneous discharge at a certain current discharge rate at a certain amount of SOC interval, performing standing for the same time as in step S1,and recording the voltage after standing; and S4: converting the recorded result in step S3 into a SOC-OCV curve, and comparing the SOC-OCV curve with a monomer OCV curve, and obtaining the relationship between the standing time and the SOC. The advantageous effects of the invention: compared with the prior art, the standing time of the SOC according to the OCV initialization is determined, and the relationship between the above-described standing time of the cells and the SOC can be determined.

Description

technical field [0001] The invention relates to the field of power batteries of electric vehicles, in particular to a method for confirming time of SOC initialization according to OCV. Background technique [0002] For the power battery of the existing electric vehicle, the SOC is estimated to be a major technical difficulty. The key to SOC estimation is the accuracy of initialization. There are many bases for SOC initialization, one of which is to determine SOC according to OCV after sufficient standing. However, this method needs to determine the standing time. If the time is too long, the flat rate of SOC initialization will be reduced. If the time is too short, the initialization result will be inaccurate, and the time may be related to the SOC itself. Contents of the invention [0003] Aiming at the problems in the related art, the present invention proposes a method for initializing the SOC confirmation time according to the OCV. [0004] For realizing above-menti...

AI Technical Summary

Problems solved by technology

However, this method needs to determine the standing time. If the time is too long, the flat rate of SOC initialization will be reduced. If the time is too short, the initialization result will be inaccurate, and the time may be related to the SOC itself.