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Mechanism modeling method for lithium ion battery

A lithium-ion battery, mechanism modeling technology, applied in secondary batteries, electrical digital data processing, circuits, etc., can solve problems such as difficult parameter identification, low accuracy of empirical models, and complex chemical model structures.

Active Publication Date: 2015-09-09
JILIN UNIV
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the disadvantages of complex electrochemical model structure, difficult identification of parameters, and low accuracy of empirical models of lithium-ion batteries. model method

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  • Mechanism modeling method for lithium ion battery
  • Mechanism modeling method for lithium ion battery
  • Mechanism modeling method for lithium ion battery

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Embodiment Construction

[0153] The present invention will be described in detail below in conjunction with the drawings:

[0154] Li-ion battery single-particle model modeling flowchart figure 1 As shown, the modeling steps of the lithium ion battery single-particle model based on the flora foraging optimization algorithm of the present invention are as follows:

[0155] 1. Establish a single-particle model of lithium-ion battery based on the working principle of lithium-ion battery.

[0156] Lithium-ion batteries are mainly composed of positive electrode, negative electrode and separator. The positive electrode active material is a mixture of lithium-rich metal oxides and corresponding gold oxides. The negative electrode active material is graphite or carbon with a similar graphite structure. The separator is a specially shaped The polymer film has a microporous structure, and lithium ions can pass freely, but electrons cannot pass. When a lithium-ion battery is charged, lithium ions are generated on the...

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Abstract

The invention belongs to the technical field of a lithium ion power battery of an electric vehicle, relates to a mechanism modeling method for the lithium ion battery and overcomes the defects that the electrochemical model of the lithium ion battery is complex in structure, parameters are difficult to identify and the experimental model precision is low. The mechanism modeling method comprises the following steps of: (1) building a single-particle model of the lithium ion battery; (2) simplifying a solid-phase diffusion equation in the single-particle model of the lithium ion battery by adopting a three-parameter parabola method; (3) identifying unknown parameters in the single-particle model of the lithium ion battery by adopting a bacteria foraging optimization algorithm; and (4) fitting an anode open-circuit voltage expression of the single-particle model of the lithium ion battery. According to the invention, by adopting the three-parameter parabola method, the structure of the single-particle model of the lithium ion battery is simplified; the unknown parameters in the single-particle model of the lithium ion battery are identified by adopting the bacteria foraging optimization algorithm, the identification speed is high, and the globally optimal solution is obtained; and the mechanism modeling method provides theoretical support for the state estimation, life prediction and characteristic analysis of the lithium ion battery.

Description

Technical field [0001] The invention belongs to the technical field of lithium-ion power batteries for electric vehicles. More specifically, the invention relates to a mechanism modeling method for lithium-ion batteries. Background technique [0002] The performance of the power battery has a great influence on the power, driving range and safety of electric vehicles. The accuracy of battery state of charge and state of health estimation, life prediction accuracy, and safe and stable operation are closely related to the modeling accuracy of power batteries. Therefore, the establishment of accurate battery models is of great significance to battery research. [0003] Currently, commonly used battery models include empirical models, multi-physics coupling models, and electrochemical models. The empirical model does not consider the principles of physical and chemical reactions. According to the collected experimental data, the characteristic curve of the lithium-ion battery is fitte...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00H01M10/0525
CPCY02E60/10
Inventor 马彦殷明月李炳思周秀文应振华茹敬佩何鹏才孙延帅王留陈虹
Owner JILIN UNIV
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