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SOC-OCV piecewise fitting method

A SOC-OCV, piecewise fitting technology, applied in the direction of measuring devices, instruments, measuring electricity, etc., can solve problems such as failure to raise

Active Publication Date: 2020-09-08
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

They all failed to propose a method that can take into account the temperature differences of various parts during the actual operation of the battery and can effectively and accurately fit the SOC-OCV relationship curve.

Method used

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  • SOC-OCV piecewise fitting method

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Embodiment Construction

[0080] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0081] This invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, components are exaggerated for clarity.

[0082] Such as figure 1 As shown, the present invention discloses a SOC-OCV curve segment fitting method, comprising the following steps:

[0083] Step 1), comparing the battery temperature with the ambient temperature to obtain the difference;

[0084] Step 2), when the absolute value of the difference between the battery temperature and the ambient temperature is less than the preset difference threshold:

[0085] Step 2.1), collect the test data of subsection fitting, make M=5%: ...

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PUM

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Abstract

The invention discloses an SOC-OCV piecewise fitting method, which comprises the following steps: firstly, selecting a certain power battery, then performing a constant-temperature pulse charging anddischarging experiment on the power battery, and recording experiment data including a positive electrode temperature Ta of the battery before standing, a temperature Tb of the middle surface of a battery body and a negative electrode temperature Tc of the battery; secondly, determining segmentation points based on a conventional OCV-SOC model, and then performing segmentation fitting; then, performing high-magnification and long-time continuous charging and discharging at the variable environment temperature, fitting a relation model of the battery cell temperature and Ta, Tb and Tc out, andperforming SOC-OCV segmented curve fitting considering the battery cell temperature; according to the method, two segmented curve models are provided and can be used for SOC estimation under differentworking conditions, and the precision can be improved.

Description

technical field [0001] The invention relates to the technical field of automobile lithium-ion power battery management, in particular to a SOC-OCV segmental fitting method. Background technique [0002] With the rapid growth of the number of fuel vehicles in the world, energy and environmental pollution caused by fuel vehicles have become a big problem, which poses great challenges to the energy structure and natural environment of various countries. More and more countries, especially those with strong automobile industries, have increased investment and research and development of clean energy vehicles, and provided corresponding policy guidance and support. Therefore, electric vehicles have become a major option to solve this problem and have developed rapidly in recent years. Currently, lithium-ion battery technology is one of the most important technologies for electric vehicles. The strong time-varying nonlinearity of the power battery and many factors make it diffic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/388G01R31/367
CPCG01R31/367G01R31/388
Inventor 王春燕何鹏张自宇颜伸翔吴刚王一松吴子涵施帅朋冯健胡犇鲁广超王衍圣钱兴国
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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