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All-weather calendar life prediction method of lithium ion battery for electric vehicle

A technology for lithium-ion batteries and electric vehicles, which is applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., and can solve the problems of single test items and inaccurate prediction results.

Active Publication Date: 2020-05-29
TIANJIN ENERGIES
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Problems solved by technology

[0004] In view of this, the present invention aims to propose a method for all-climate calendar life prediction of lithium-ion batteries for electric vehicles, so as to solve the problems of single test items and inaccurate prediction results in the current lithium-ion battery calendar life prediction process.

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  • All-weather calendar life prediction method of lithium ion battery for electric vehicle

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Embodiment Construction

[0042] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0043] In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner" and "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construed as limiting the invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be understood ...

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Abstract

The invention provides an all-weather calendar life prediction method of a lithium ion battery for an electric vehicle. The method comprises the following steps: S1, establishing a lithium ion batterythermal-electrochemical coupling simulation model containing positive and negative side reaction sub-models; S2, carrying out shelving experiments on the lithium ion battery under different conditions, and inputting condition parameters into the simulation model established in the step S1; S3, measuring the performance of the battery subjected to the shelving experiment in the step S2, and adjusting and optimizing the model parameters according to the performance of the battery; S4, determining the temperature correlation of the side reaction; and S5, operating the computer simulation model to obtain performance prediction results including all-weather influences in different life stages. The all-weather calendar life prediction method of the lithium ion battery forthe electric vehicle can predict the rate charging and discharging performance, the power performance and the temperature performance of the battery in different life stages and can provide useful and necessary data for a BMS system and a thermal management system.

Description

technical field [0001] The invention belongs to the technical field of life prediction of lithium batteries, and in particular relates to a method for predicting life of a lithium ion battery for an electric vehicle in all weather calendars. Background technique [0002] The calendar life refers to the time required for the battery to reach the end of life in an open circuit state at a certain reference temperature (that is, the life of the battery in a standby state). [0003] New energy vehicles using lithium-ion batteries as energy storage components have developed rapidly around the world. As a large-scale consumer product with a large one-time investment and long durability, the automobile requires the lithium-ion power battery, which is the most power source, to have a corresponding service life. Lithium-ion battery calendar life is an important indicator of battery performance. Since the calendar life time span of lithium-ion batteries is very large, the calendar li...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/367G01R31/385G01R31/392
CPCG01R31/367G01R31/385G01R31/392
Inventor 靳尉仁从长杰王驰伟
Owner TIANJIN ENERGIES
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