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Calculation method and system for direct-current internal resistance of lithium-ion battery

A lithium-ion battery, DC internal resistance technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of poor practicability and large test limitations, and achieve the effect of strong practicability

Inactive Publication Date: 2019-01-11
台州钱江新能源研究院有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method and system for calculating the DC internal resistance of lithium-ion batteries, so as to solve the problems of poor practicability and large test limitations of the existing battery internal resistance analysis

Method used

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  • Calculation method and system for direct-current internal resistance of lithium-ion battery
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  • Calculation method and system for direct-current internal resistance of lithium-ion battery

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Embodiment Construction

[0029] The following are specific embodiments of the present invention and in conjunction with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terminology used herein in the description of the present invention is only for the purpose of describing specific embodiments, and is not intended to limit the present invention.

[0031] The invention deduces the DC resistance value of the same type of battery under the actual use environment by establishing a model of temperature and DC internal resistance.

[0032] see figure 1 , is a flowchart of a method for calculating the DC internal resistance of a lithium-ion battery in an embodiment of the present invention.

[0033] T...

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Abstract

The invention discloses a calculation method and system for the direct-current internal resistance of a lithium-ion battery which are used for solving the problem that only several limited points of the internal resistance temperature of a battery can be tested in the prior art. The calculation method comprises the steps that the lithium-ion battery is subjected to direct-current internal resistance test at multiple experimental temperatures to obtain corresponding direct-current internal resistance; by combining with an Arrhenius equation, a model is established according to the experimentaltemperatures and the corresponding direct-current internal resistance; and the direct-current internal resistance of the same type of battery at any temperature point in the temperature interval of the experimental temperatures is calculated according to the model. By establishing the model of the temperature and the direct-current internal resistance, a direct-current internal resistance value atany temperature point can be tested, and practicability is high.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a method and system for calculating the DC internal resistance of a lithium-ion battery. Background technique [0002] With the wide application of lithium-ion battery-based energy storage systems in electric vehicles and other fields, users are paying more and more attention to the daily use experience under the premise of ensuring life and safety; the power and DC internal resistance of power batteries are lithium One of the most important parameters in ion batteries. At present, the analysis of battery internal resistance at home and abroad generally focuses on the testing and identification methods of internal resistance at room temperature, while the internal resistance characteristics of lithium batteries under different working conditions are rarely mentioned, and the existing battery internal resistance The temperature test method can only test a limited number of poin...

Claims

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Application Information

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IPC IPC(8): G01R31/367G01R31/389
Inventor 曾佳佳李正斌仇健荣闫振忠唐斌周小芳谢挺郑倩
Owner 台州钱江新能源研究院有限公司
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