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Lithium battery SOH estimation method

A lithium battery and estimation formula technology, which is applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problem of low accuracy of estimation results, achieve the effects of reducing errors, improving estimation accuracy, and ensuring accuracy

Active Publication Date: 2017-04-26
四川普力科技有限公司
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Problems solved by technology

[0008] In order to overcome the technical problem of low accuracy of the estimation result of the existing lithium battery SOH, the present invention provides a method for estimating the SOH of the lithium battery, which can effectively improve the estimation accuracy

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  • Lithium battery SOH estimation method

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Embodiment Construction

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and implementation examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0029] The invention provides a method for estimating lithium battery SOH, such as figure 1 shown, including:

[0030] Step S1: Test the sample lithium battery to obtain a plurality of sample lithium batteries SOH, and obtain at least two sets of test voltages and DC output impedances corresponding to the test voltages in the discharge state of each sample lithium battery, including a maximum test voltage and its Corresponding DC output impedance;

[0031] Step S2: Use the sample lithium battery SOH, the test voltage, and the DC output impedance corresponding to the test voltage ...

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Abstract

The invention relates to the technical field of a lithium battery, and specifically relates to a lithium battery SOH estimation method. The method comprises the following steps: testing a sample lithium battery to obtain a plurality of sample lithium battery SOH, and obtaining at least two groups of test voltage and DC output impedance corresponding to the test voltage of the sample lithium battery under a discharge condition; fitting an initial estimation formula and a modifier formula based on voltage expression by utilizing the sample lithium battery SOH, the test voltage and the DC output impedance corresponding to the test voltage; obtaining a lithium battery SOH estimation formula based on the initial estimation formula and the modifier formula; and obtaining SOH of a lithium battery to be tested based on the estimation formula. Through the introduction of the modifier formula, estimation accuracy can be improved effectively; and the modifier formula is expressed by voltage, that is, the real-time voltage of the lithium battery to be tested needs to be tested for calculation of the SOH of the lithium battery to be tested, the current state of the lithium battery to be tested can be expressed, and accuracy of the provided estimation method is ensured.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of lithium batteries, in particular to a method for estimating the SOH of a lithium battery. [0003] 【Background technique】 [0004] As a new type of energy technology, battery technology is developing rapidly. Among them, lithium batteries have the advantages of small size, light weight, high energy density, and low environmental pollution. Therefore, lithium batteries have been widely used. [0005] In order to ensure that lithium batteries can work efficiently and safely, an effective battery management system is needed. Among them, the research on lithium battery SOH (Section Of Health, battery health status) is an important topic in the field of lithium battery technology, and the ability to correctly predict the health status of lithium batteries is of great help to the practical application of lithium batteries. [0006] However, the aging process of lithium batteries is complex, and there a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/3648G01R31/392
Inventor 冯雪松向勇向俊杰刘家琛
Owner 四川普力科技有限公司
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