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Battery charging and discharging current control method for electric vehicle

A technology of charge and discharge current and charge current, which is applied in the field of electric vehicle battery management, to achieve optimal estimation and management, balance power and long life, and prevent overcharging and overdischarging effects

Inactive Publication Date: 2012-02-15
HUIZHOU EPOWER ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, the technical problem to be solved by the present invention is to provide a method for controlling the charge and discharge current of an electric vehicle battery, which solves the defect that the maximum allowable charge and discharge current of an electric vehicle battery is a fixed limit value.

Method used

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  • Battery charging and discharging current control method for electric vehicle
  • Battery charging and discharging current control method for electric vehicle
  • Battery charging and discharging current control method for electric vehicle

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Embodiment Construction

[0012] In order to facilitate the understanding of those skilled in the art, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments:

[0013] The electric vehicle battery charge and discharge current control method adopted in the embodiment of the present invention can control the charge and discharge current according to the real-time temperature of the battery and the state of charge of the battery, instead of using a fixed limit value as the maximum allowable charge and discharge current of the battery in the existing method When the battery is in a good state, the power of the battery can be fully utilized, and when the battery is in a bad state, it can prevent the battery from overcharging and over-discharging, and balance the relationship between the power of the battery and its long life.

[0014] In this embodiment, the control method includes the following steps:

[0015] a. Taking different temper...

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Abstract

The invention provides a battery charging and discharging current control method for an electric vehicle. In the invention, the maximum allowable charging and discharging current is not a unified limit value and varies with temperature and the charge state of a battery, so that control parameters of the battery are refined so as to more finely control the charging and discharging current of the battery and realize optimal estimation and management of the maximum allowable charging and discharging current of the battery. The battery charging and discharging current control method provided by the invention has the beneficial effects that the dynamic property of the battery can be fully utilized when the battery is in good condition, over-charge and over-discharge of the battery can be avoided when the battery is in bad condition, and the conflict between the use dynamic property and long service life of the battery can be solved.

Description

technical field [0001] The invention relates to the improvement of the electric vehicle battery management technical solution. Background technique [0002] Electric vehicles are the future of the automobile industry. Under the joint promotion of the government and automobile manufacturers, they have developed rapidly. However, the problems of insufficient power and short life of the battery system seriously restrict the development of electric vehicles. Now the maximum allowable charge and discharge current of the battery is set to a limit value. During the use of the vehicle, the battery management system of the electric vehicle controls the actual charge and discharge current of the battery to not exceed the limit value. However, due to the great difference in the performance of the battery at different temperatures and the state of charge (SOC) of the battery, the maximum allowable charge and discharge current can withstand The charge and discharge current of the batter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
Inventor 刘飞阮旭松文锋
Owner HUIZHOU EPOWER ELECTRONICS
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