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Soc battery pack balance control method

A technology of balance control and battery pack, applied in the field of control, can solve problems such as affecting the consistency of batteries and affecting the effect of battery balance.

Active Publication Date: 2021-04-13
羿动新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The battery balance evaluation index is an important part of the balance control. The selection of the balance index will seriously affect the effect of battery balance and affect the evaluation of battery consistency.

Method used

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  • Soc battery pack balance control method
  • Soc battery pack balance control method
  • Soc battery pack balance control method

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Experimental program
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Effect test

Embodiment Construction

[0187] The present invention comprises the following steps:

[0188] Step 1: According to the design requirements of the battery pack equalization circuit, a bidirectional equalization circuit based on power inductors is designed based on Buck-Boost, and the working principle of the equalization circuit is analyzed. Later, in order to speed up the efficiency of battery equalization, the two-way equalization circuit based on power inductors was expanded, and a two-stage two-way equalization circuit based on power inductors was designed.

[0189] Step 2: Establish a second-order RC loop equivalent circuit model considering temperature, design experiments and identify parameters in the battery model based on experimental data, and then verify the accuracy of the battery model under variable temperature conditions.

[0190] Step 3: Based on the second-order RC loop equivalent circuit model established in step 2, estimate the battery SOC considering capacity fading, design a dual K...

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PUM

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Abstract

The invention relates to an SOC battery pack balance control method, which belongs to the technical field of control. The purpose of the present invention is based on the SOC estimation result and adopts the model predictive control algorithm to realize the battery pack balance system, improve the inconsistency between the cells in the battery pack, and effectively reduce the battery pack equalization time and energy consumption based on the SOC battery pack balance Control Method. The steps of the present invention are: designing a secondary two-way equalization circuit based on power inductance; establishing a second-order RC loop equivalent circuit model considering temperature; performing battery SOC estimation considering capacity attenuation, and designing a double Kalman estimator for battery SOC estimation; perform model-based predictive control for battery pack balance control. The invention improves battery SOC estimation accuracy on the basis of considering temperature and capacity attenuation, and provides accurate balance index for battery pack balance.

Description

technical field [0001] The invention belongs to the technical field of control, and in particular relates to a battery balancing technology of an electric vehicle. Background technique [0002] With the rapid development of science and technology and the continuous progress of society, the living standards of people all over the world have also been continuously improved, and the number of automobiles has also increased significantly, which has led to the excessive consumption of the earth's resources, especially some non-renewable energy sources, such as oil, etc. . my country is a big oil importer, and the continuous increase in car ownership has led to an increase in our country's dependence on oil imports. Therefore, the development of electric vehicles is an inevitable choice for our country. The key part of electric vehicles is the battery, and the current batteries generally include nickel-metal hydride batteries, lithium-ion batteries and fuel cells. Considering th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L58/22G06F17/11H02J7/00B60L58/12
CPCB60L58/12B60L58/22G06F17/11H02J7/0014Y02T10/70
Inventor 马彦段鹏陈虹
Owner 羿动新能源科技有限公司
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