Method for testing net energy of electrical vehicle power battery

A technology for electric vehicles and power batteries, which is applied in the field of energy consumption testing of electric vehicles, can solve problems such as difficulty in changing the net energy of batteries, and achieve high accuracy and easy test methods

Active Publication Date: 2011-07-13
WUHAN UNIV OF TECH +1
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Because this method does not consider the influence of charge and discharge efficiency, and the accurate acquisition of voltage and current is limited by the measuring instrument, it is very difficult to accurately obtain the change value of the battery net energy

Method used

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  • Method for testing net energy of electrical vehicle power battery
  • Method for testing net energy of electrical vehicle power battery
  • Method for testing net energy of electrical vehicle power battery

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Embodiment Construction

[0029] Embodiments of the present invention will now be described with reference to the drawings, in which like reference numerals represent like elements.

[0030] The principle of the method for testing the net energy of the electric vehicle power battery of the present invention will be described in detail below in conjunction with the accompanying drawings and specific examples. The battery pack used in the electric vehicle in this embodiment is a LiFePO4 lithium-ion power battery produced by a domestic company.

[0031] Such as figure 1 As shown, the electric vehicle power battery net energy test method comprises the following steps:

[0032] Step S1, according to the national standard, the battery pack is charged at the rated current (the rated current of different types of batteries is determined by the corresponding national battery performance test specifications and the type of electric vehicle, when the test electric vehicle is a pure electric vehicle (EV), this pa...

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Abstract

The invention discloses a method for testing net energy of an electrical vehicle power battery, which comprises the following steps of: charging a battery set in a state of discharging stop voltage to the state of charging stop voltage, recording the charged energy, discharging the battery set to a pre-set SOC by the stated current, recording the energy discharged at the first time, and then performing a working situation circulation test to the electrical vehicle, discharging the battery set to the discharging stop voltage by the stated current when the test is finished, recording the energy discharged at the second time, obtaining the energy change amount of the battery in the working situation circulation test according to the average charging and discharging efficiency of the battery set, correcting the energy change amount of the battery in the working situation circulation test according to the battery charging and discharging energy efficiency models, and obtaining the energy actually stored by the battery in the working situation circulation process, namely the battery net energy. The method considers the effect to battery net energy of charging and discharging efficiencies on one hand with high testing accuracy, and only tests the charging and discharging energies of the electrical vehicle before and after the test on the other hand, which is easy to be realized.

Description

technical field [0001] The invention relates to the technical field of electric vehicle energy consumption testing, in particular to a method for testing the net energy of a power battery of an electric vehicle. Background technique [0002] Power battery is the most commonly used energy storage component in various electric vehicles, and its power performance directly affects the operating cost and service life of electric vehicles. Therefore, it is necessary to make full use of the limited energy stored in the battery pack to reduce the operating cost and prolong the service life of electric vehicles. At present, there are many studies on the energy optimization and energy management system of vehicle power battery packs, but there are few studies on the change of battery net energy, which is closely related to the energy consumption and emissions of electric vehicles. The study of the net energy of electric vehicle power batteries has significant significance: 1) It prov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 颜伏伍张佩杜常清赵奕凡康健强
Owner WUHAN UNIV OF TECH
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