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Charging control method for battery of electric vehicle and equipment thereof

A battery charging and electric vehicle technology, applied in electric vehicles, battery circuit devices, current collectors, etc., can solve problems such as shortening battery life, damaging charging equipment, and taking a long time to fully charge, avoiding overcharging and ensuring safety effect

Active Publication Date: 2011-05-11
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The constant voltage charging method has a large initial charging current, which may easily cause overcurrent of the battery pack with a large discharge depth and damage the charging equipment; at the end of charging, due to the increase of the electromotive force, the charging current is very small, and it takes a long time to fully charge
Constant current charging is not suitable for long time charging with high current
[0003] In addition, during the battery charging process, overcharging is prone to occur, and the battery voltage begins to drop after reaching the highest point, and the battery temperature and internal pressure rise rapidly, shortening the battery life, and even causing battery damage

Method used

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  • Charging control method for battery of electric vehicle and equipment thereof
  • Charging control method for battery of electric vehicle and equipment thereof
  • Charging control method for battery of electric vehicle and equipment thereof

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Embodiment Construction

[0045] The present invention will be described more fully below with reference to the accompanying drawings, in which exemplary embodiments of the present invention are illustrated. In the drawings, the same reference numerals indicate the same or similar components or elements.

[0046] During the charging process of the battery pack, the charging current can be simplified to the following formula:

[0047] I=(U-E) / r (1)

[0048] In formula (1), I is the charging current, U is the charging voltage, E is the electromotive force of the battery pack, and r is the internal resistance of the battery pack.

[0049] It can be seen from formula (1) that as the charging process progresses, the electromotive force E of the battery pack gradually rises, and finally approaches the rated voltage, while the charging current shows a trend of high before and low. figure 1 Shows the curve relationship between charging current, charging voltage and battery electromotive force.

[0050] According to th...

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Abstract

The invention discloses a charging control method for a battery of an electric vehicle and equipment thereof. The method comprises the following steps of: measuring the current electromotive force and charging current of the battery; determining a current charging parameter according to the current electromotive force and charging current, and an ideal charging current of the battery; and controlling the charging of the battery according to the current charging parameter. A charging station operation monitoring system can acquire available charging capacity information of a charging station from a distribution network automation system; and under the limit of the available charging capacity of the charging station, the output power of the battery is adjusted according to the charging parameter and a charging emergency degree of the battery. When the charging of a battery pack is controlled by the charging station of the electric vehicle, the charging parameter is adjusted automatically according to a current state by combining an acceptable ideal charging current curve of the battery pack, tracking a temperature of the battery pack in real time, and adopting voltage feedback compensation. Therefore, the performance and the service life of the battery pack are brought into play to the maximum.

Description

Technical field [0001] The invention relates to an electric vehicle battery charging technology, in particular to an electric vehicle battery charging control method and equipment. Background technique [0002] At present, the commonly used charging methods for electric vehicles include constant voltage charging and constant current charging. In the initial stage of constant voltage charging, the electromotive force of the battery pack is relatively low and the charging current is large. As the charging process proceeds, the electromotive force of the battery pack gradually rises and the charging current automatically decreases. The constant current charging charging current can be adjusted, and it can charge the battery packs in various states. It is especially suitable for low current charging for a long time, which is beneficial to the maintenance charging of batteries with slow capacity recovery and the initial charging of new batteries. In the constant voltage charging meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
Inventor 王相勤胡江溢贾俊国丁孝华倪峰张浩赵明宇汪映辉路致远孙广明储毅高春雷
Owner STATE GRID CORP OF CHINA
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