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A method for detecting charging power of an electric vehicle

A technology for electric vehicles and charging power, which is applied in the direction of electric vehicles, measuring electric power, and electrical devices, etc., and can solve the problem of few modeling methods

Active Publication Date: 2016-04-20
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, domestic electric vehicle charging load modeling is mainly based on the statistical modeling method of Monte Carlo simulation, and there are few modeling methods based on the actual physical process of electric vehicle charging.

Method used

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  • A method for detecting charging power of an electric vehicle
  • A method for detecting charging power of an electric vehicle
  • A method for detecting charging power of an electric vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0046] 1. Analyze the rechargeable batteries of electric vehicles.

[0047] Known lithium-ion batteries refer to secondary batteries composed of two compounds that can reversibly intercalate and deintercalate lithium ions as positive and negative electrodes, which rely on the transfer of lithium ions between the positive and negative electrodes to complete the charge and discharge of the battery. When the battery is charged, lithium ions are extracted from the positive electrode and embedded in the negative electrode, and vice versa during discharge.

[0048] Find the concentration of lithium ions in the negative electrode of a lithium battery and how this concentration changes over time, as follows:

[0049] As shown in the table, assuming that n lithium ions are one energy element A, when charging starts, the energy element concentration of the positive electrode of the lithium-ion battery is u0. Due to diffusion, the energy element will diffuse with its movement to increase the ne...

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Abstract

The invention relates to a charging power detection method for an electric car. The charging power detection method for the electric car comprises the following steps that (1) a charging battery of the electric car is analyzed; (2) a model is built based on the diffusion theory according to the analysis result; (3) a diffusion equation is obtained according to the diffusion model; (4) the total charging power of the electric car is obtained according to the diffusion equation. The charging power detection method for the electric car takes the key factors, affecting the total charging load, such as charging power, the number of electric cars, a staring SOC, the starting charging time and the capacity of the battery all into account, and can predict the SOC state of the battery at a certain time.

Description

Technical field [0001] The invention belongs to the charging and swapping technology of electric vehicles, and particularly relates to a method for detecting the charging power of electric vehicles. Background technique [0002] The large-scale application of electric vehicles will bring new challenges to the construction of charging facilities and grid operation. The power grid basically has no storage capacity (except for some pumped storage), so power generation and transmission must try to match the fluctuations in the electricity load. With the continuous increase in R&D investment and breakthroughs in key technologies, China will enter a period of rapid development of electric vehicles, especially electric passenger vehicles. After the large-scale application of electric vehicles is formed, this will bring new improvements to the development of charging facilities and the operation of the power grid. Challenges: (1) Initiate new load growth and further increase the peak-to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R21/00
Inventor 杨芳刘志红张建伟秦俭周斌刘昭慧吕晓荣惠琪耿群锋赵翔
Owner STATE GRID CORP OF CHINA
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