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Method for charging battery of electric vehicle

A charging method and electric vehicle technology, applied to electric vehicles, secondary battery charging/discharging, battery circuit devices, etc., can solve problems affecting driving safety, high battery charging current, battery damage, etc.

Inactive Publication Date: 2014-09-24
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When electric vehicles are feeding back energy, the existing electric vehicle battery charging method is an uncontrollable charging method. In this case, it is easy to cause the charging current of the battery to be too large, and in serious cases, it will cause battery damage and affect driving safety.

Method used

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  • Method for charging battery of electric vehicle
  • Method for charging battery of electric vehicle
  • Method for charging battery of electric vehicle

Examples

Experimental program
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Embodiment

[0068] figure 1 It is a flowchart of a charging method for an electric vehicle battery of the present invention.

[0069] In this embodiment, as figure 1 As shown, an electric vehicle battery charging method of the present invention includes the following steps:

[0070] S1). Collect the current of the battery input terminal, battery charging rate and battery temperature through the sensor;

[0071] In this embodiment, the current sensor is used to collect the current at the battery input terminal and the battery charging rate, and the temperature sensor is used to collect the battery temperature;

[0072] S2). Estimate the SOC of the battery according to the adaptive SOC estimation algorithm;

[0073] SOC = SOC 0 - 1 C O ∫ 0 τ ηIdt

[0074] Among them, SOC 0 It represents the initial state of charge, SOC represents the next state of charge, η represents the charge and discharge efficiency, τ is the charge and discharge time, C I Indicates the total ...

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Abstract

The invention discloses a method for charging a battery of an electric vehicle. The method comprises the steps that when the electric vehicle conducts energy feedback, the curve of the SOC of the battery and the maximum allowable charging current of the battery is inquired by estimating the SOC of the battery, and the maximum allowable charging current of the battery is obtained; then, the braking torque of the electric vehicle is reduced with a current control method, so that the charging current existing when energy feedback is conducted is not larger than the maximum allowable charging current of the battery, and the charging safety of the battery is guaranteed. The safety of the battery is guaranteed, the output current of a motor is increased to the greatest extent at the same time, so that the output current is approximate to the maximum allowable charging current, and therefore the charging efficiency is improved.

Description

Technical field [0001] The invention belongs to the technical field of electric vehicles, and more specifically, relates to a method for charging an electric vehicle battery. Background technique [0002] Energy conservation and environmental protection have become an important issue facing the development of today's society. The large-scale use of fuel vehicles has severely restricted the environmental protection of today's society. Therefore, new energy vehicles have received more and more attention from governments. According to the "Twelfth Five-Year Plan" for the development of electric vehicle technology, from 2015 to 2020, we will continue to promote the large-scale industrialization of pure electric vehicles represented by small electric vehicles, and start the industrialization of the next generation of pure electric vehicles. At this stage, take the next-generation power battery technology route as the lead, start the industrialization of the next-generation power batte...

Claims

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Application Information

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IPC IPC(8): H02J7/00H01M10/44
CPCY02E60/10
Inventor 郑宏刘煦魏旻
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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