A battery aging parameter identification method

Abstract

The invention discloses a battery aging parameter identification method, comprising the following steps: (1) establishing an OCV-Ah curve aging database of the battery; (2) collecting real vehicle data, performing parameter identification on the collected data segments, and splicing Become a complete OCV-Ah curve; (3) put the splicing OCV-Ah curve that step (2) obtains into the OCV-Ah curve aging database for comparison, which is most consistent with the splicing OCV-Ah curve in the database The battery capacity corresponding to the OCV‑Ah curve is the actual capacity of the battery when the real vehicle data is collected. The invention establishes the battery aging database in advance, and when performing battery parameter identification, it only needs to collect the current and voltage values ​​of the battery during vehicle operation, and through the on-board computer to carry out parameter identification and comparison, the battery at the time of real vehicle data collection can be obtained conveniently and quickly. The actual capacity of the battery can accurately estimate the state of charge of the battery, and then accurately calculate the mileage that the battery can support to prolong the battery life.

Description

technical field [0001] The invention relates to the field of battery parameter identification methods, in particular to a battery aging parameter identification method. Background technique [0002] Traction batteries are widely used in pure electric vehicles and hybrid vehicles, and their cost accounts for a large proportion of the cost of a complete vehicle. The performance parameters of the power battery will decline with the use of the vehicle, which is specifically reflected in: battery capacity decay, battery internal resistance increase, and changes in other parameters such as hysteresis coefficient. If the aging parameters of the battery cannot be accurately identified, it may cause excessive use of the battery, thereby reducing the battery life; on the contrary, if the aging parameters of the battery can be accurately identified, the service life of the battery can be improved. [0003] Usually, the battery pack of a hybrid electric vehicle contains dozens or even ...

AI Technical Summary

Problems solved by technology

If the battery parameters are inaccurate, the estimated mileage will be inaccurate, and the battery will be overcharged and overdischarged, which will not only deteriorate the driving experience, but also seriously shorten the battery life and cause economic losses.

[0005] At present, the identification of battery aging parameters is still an unsolved problem in the automotive industry, especially the battery capacity and OCV-SOC curve. At present, there is no effective method to accurately identify based on the data collected from real vehicles.

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