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Fitting method of open circuit potential curves of electrode materials for lithium ion batteries

A lithium-ion battery, open circuit potential technology, applied in the field of fitting, can solve the problem of not taking into account the curve characteristics and the position where the curve characteristics appear, and achieve the effect of simple fitting results of the open circuit potential curve function

Active Publication Date: 2017-02-22
SHANGHAI POWER ENERGY STORAGE BATTERY SYST ENG TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a fitting method for the open circuit potential curve of the electrode material of a lithium ion battery. The fitting method solves the problem that the existing method does not take into account the curve characteristics and the position where the curve characteristics appear, and can obtain an accurate open circuit potential curve. Fitting function, the simulation effect is more effective

Method used

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  • Fitting method of open circuit potential curves of electrode materials for lithium ion batteries
  • Fitting method of open circuit potential curves of electrode materials for lithium ion batteries
  • Fitting method of open circuit potential curves of electrode materials for lithium ion batteries

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Embodiment

[0049] The negative electrode material of lithium-ion batteries is usually graphite. Take the open circuit potential curve of graphite as an example.

[0050] The first step: select the hyperbolic tangent function y=tanh(x) and the exponential function y=exp(x) as the basic form of the mathematical function of the open circuit potential curve fitting, such as image 3 Shown is the open circuit potential curve of graphite material;

[0051] The second step: the step-by-step fitting process of the mathematical function of the open circuit potential curve, the specific fitting process is as follows:

[0052] Step 1: Determine the platform area of ​​the open circuit potential curve and the position where the transition between the two platforms occurs, such as image 3 As shown, it can be seen from the curve that there are three platform areas in the three intervals of 0.06~0.11, 0.23~0.47, and 0.53~0.95, and there are turning points at 0.055, 0.15, 0.5, and 0.96, and the entire ...

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Abstract

The invention discloses a fitting method of open circuit potential curves of electrode materials for lithium ion batteries. The fitting method of open circuit potential curves of electrode materials for lithium ion batteries includes the following steps that (1) a hyperbolic tangent function y = tanh (x) and a exponential function y = exp(x) is selected as the basic form of a open circuit potential curve fitting mathematical function; (2) the stepwise fitting process of the open circuit potential curve is started and the turning section of each platform is fitted into the form of hyperbolic tangent function and the sharp change section of each voltage is fitted into the form of exponential function; (3) the hyperbolic tangent function and the exponential function are summed up and a total fitting function and its total fitting curve are obtained, and the total fitting curve is subtracted with the target open circuit potential curve and a fitting error curve is gotten; (4) the fitting error curve is fitted again by using the hyperbolic tangent and the exponential function, so as to optimize the fitting result and reduce the fitting error until satisfying the demand of fitting precision. The fitting open circuit potential curves has the advantages of making the function more accurate and making the simulation effect more effective.

Description

technical field [0001] The invention relates to a fitting method, in particular to a fitting method for an open circuit potential curve of an electrode material of a lithium ion battery. Background technique [0002] Lithium-ion battery is the latest generation of green high-energy rechargeable battery, which has outstanding advantages such as high voltage, high energy density, good cycle performance, small self-discharge, and no memory effect. In recent years, lithium-ion batteries have developed rapidly and have been widely used in consumer electronics, new energy vehicles, satellite and space vehicle power systems, and energy storage power stations. [0003] With the goal of safe, reliable, long-life and high-efficiency operation of lithium-ion batteries, more and more attention has been paid to and applied to the electrochemical mechanism model of lithium-ion batteries in the field of cell body design and battery management system research. The electrochemical mechanism...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/367
Inventor 罗伟林吕桃林邵雷军刘辉晏莉琴罗英张熠霄解晶莹
Owner SHANGHAI POWER ENERGY STORAGE BATTERY SYST ENG TECH
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