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Electrochemical Mechanism Modeling Method for Li-ion Batteries

A lithium-ion battery, mechanism modeling technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as complex models and difficult solutions

Active Publication Date: 2018-09-25
JILIN UNIV
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Problems solved by technology

The model has high precision, but the model is complex and difficult to solve

Method used

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  • Electrochemical Mechanism Modeling Method for Li-ion Batteries
  • Electrochemical Mechanism Modeling Method for Li-ion Batteries
  • Electrochemical Mechanism Modeling Method for Li-ion Batteries

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Embodiment

[0263]The operation process of the present invention will be described below with a specific example.

[0264] In this example, positive , the negative pole Taking graphite lithium-ion battery as an example, the specific implementation process is as follows

[0265] 1. According to the electrochemical reaction mechanism, the kinetic equation of the electrochemical reaction inside the battery shown in formulas (1)-(9) is obtained.

[0266] 2. According to the finite difference method, the partial differential equation of battery dynamics is transformed into a system of ordinary differential equations, and the average value of the lithium ion flow density on the solid-liquid two-phase interface at the positive and negative electrodes of the battery is calculated, and then the liquid phase potential difference between the positive and negative electrodes of the battery is solved and the positive and negative overpotential difference, the lithium-ion battery terminal voltage a...

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Abstract

The invention provides an electrochemical mechanism modeling method for a lithium-ion battery, belongs to the field of batteries, and relates to a modeling method for the lithium-ion battery. The object of the invention is to rebuild an electrochemical mechanism modeling method for the lithium-ion battery by the adoption of a difference method for building a battery average value model based on an electrochemical mechanism model of the lithium-ion battery. The method includes steps: firstly, simplifying the mechanism model of the battery and building an average value model of the lithium-ion battery; secondly, identifying model parameters; and thirdly, obtaining the electrochemical average value model of the lithium-ion battery by the integration of identification parameters and known parameters. According to the method, the model calculation amount is less, the realization of a real vehicle is easy, and the method can be used for battery charge state estimation and health management and provide reference data for the operation of the battery.

Description

technical field [0001] The invention belongs to the field of batteries and relates to a modeling method for lithium ion batteries. Background technique [0002] The electrochemical model of electric vehicle power battery is closely related to the design, mass production, vehicle optimization and control of electric vehicles. In order to accurately estimate the state of charge of the power battery, monitor the state of health of the battery, predict the life of the battery, and optimize the operation of the battery, it is necessary to establish an accurate battery model to ensure that the power battery operates in a high-efficiency area, prolong the service life of the battery, and avoid The occurrence of battery safety accidents. [0003] The battery electrochemical mechanism model based on the electrochemical principle of porous electrodes is composed of multiple partial differential equations, ordinary differential equations and algebraic equations, and the parameters hav...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 马彦周秀文应振华李炳思王留茹敬佩孙延帅赵海艳王宇雷陈虹
Owner JILIN UNIV
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