Control method and system for eliminating power battery memory effect

Abstract

The invention discloses a control method and system for eliminating the power battery memory effect. A power battery management system makes a finished automobile control device control a finished automobile to enter a memory effect eliminating work mode by sending a request that the finished automobile enters the memory effect eliminating work mode to the finished automobile controller, and the power battery management system adjusts the SOC use range sent to the finished automobile controller and the currently allowed maximum charging/discharging power of a power battery in real time through the magnitude relation between the current SOC and a first/second preset SOC of the power battery, so that the finished automobile conducts completely discharging and fully charging on the power battery, 100% use of SOC of the power battery is achieved, and thus the power battery memory effect is eliminated to the maximum degree.

Description

technical field [0001] The invention relates to the technical field of automotive electronic control, and more specifically, to a control method and system for eliminating memory effects of a power battery. Background technique [0002] With the increasingly prominent energy and environmental issues, new energy vehicles are highly valued by countries all over the world. At present, various types of new energy vehicles use different types of power batteries to provide auxiliary or main power sources for new energy vehicles. Power batteries mainly include nickel-metal hydride batteries, nickel-cadmium batteries, and lithium-ion batteries. Among them, nickel-hydrogen batteries are an important part of power batteries and have been widely used in various new energy vehicles in recent years, especially in moderate hybrid vehicles. There are many applications. [0003] During the operation of new energy vehicles, in order to prevent overcharging and overdischarging of the power ...

AI Technical Summary

Problems solved by technology

[0004] With the long-term operation of new energy vehicles, the power battery will show that the maximum capacity currently available for the power battery is the capacity of the long-term use range due to the memory effect, rather than the rated capacity of the power battery; and due to the emergence of the memory effect, resulting in The charge and discharge curve of the traction battery is inconsistent with the charge and discharge curve of the traction battery when it leaves the factory

The management system of the power battery management system for the power battery, such as SOC calculation, energy management, etc., is usually matched according to the charge and discharge curve of the power battery when it leaves the factory. If the memory effect of the power battery occurs and the battery charge and discharge curve changes, it will increase. The difficulty of power battery SOC estimation and energy management may eventually lead to battery overcharge and overdischarge due to inaccurate SOC estimation and improper energy management

Images