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Quantitative estimation method of lithium ion power battery internal short-circuit degree

A power battery and internal short-circuit technology, which is applied in the direction of measuring electrical variables, measuring electricity, and measuring devices, to achieve the effects of reducing safety accidents of lithium-ion power batteries, accurate and effective internal short-circuit resistance values, and improving reliability

Active Publication Date: 2016-11-23
TSINGHUA UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

At present, there is no technical solution that can directly measure and estimate the size of the short-circuit resistance in the battery

Method used

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  • Quantitative estimation method of lithium ion power battery internal short-circuit degree
  • Quantitative estimation method of lithium ion power battery internal short-circuit degree
  • Quantitative estimation method of lithium ion power battery internal short-circuit degree

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Embodiment Construction

[0034] Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0035] See figure 1 , the present invention provides a method for quantitatively estimating the degree of short circuit in a lithium-ion power battery, specifically comprising the following steps:

[0036] S1: Select a lithium-ion power battery;

[0037] S2: Perform a performance test on the lithium-ion power battery, so as to obtain the half-cell electrochemical characteristics of the lithium-ion power battery, that is, the positive electrode material potential V p (y) and negative electrode material potential V n (x), where y and x are respectively the stoichiometric number of Li in the positive and negative electrode materials;

[0038] S3: Under the condi...

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Abstract

The invention provides a quantitative estimation method of a lithium ion power battery internal short-circuit degree, and the quantitative estimation method belongs to the technical field of batteries. The invention provides the estimation method based on a battery electrochemical model, which identifies model parameters by adopting an optimization method, and through establishing an internal short-circuit equivalent circuit model and utilizing variations of half-cell voltage along with the state of charge (SOC) and a discharge voltage curve of an internal short-circuit battery, thereby acquiring an estimated value of internal short-circuit resistance. The quantitative estimation method has good repeatability, high adaptability, can be used for evaluating the internal short-circuit degree of the battery with triggered internal short-circuit, and can complete the estimation of magnitude of the internal short-circuit resistance in different battery operating states. The quantitative estimation method provides valid internal short-circuit evaluation data for an internal short-circuit early detection algorithm, and has important practical significance.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a quantitative estimation method based on the internal short circuit degree of a lithium-ion power battery. Background technique [0002] Under the dual pressure of energy shortage and environmental pollution, the widespread application of new energy has become an irreversible trend of technological development. The electrification of automobile power system has gradually become the main trend of future automobile technology development. One of the main characteristics of the electrification of the vehicle power system is the use of electrical energy instead of chemical energy as the main source of driving energy for the vehicle. The storage of electrical energy requires a certain carrier, that is, an electrochemical energy storage system. Lithium-ion power batteries have the advantages of high energy density and long cycle life, and have become one of the main ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/3648
Inventor 郭锐冯旭宁卢兰光欧阳明高李建秋何向明
Owner TSINGHUA UNIV
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