A method for all-climate calendar life prediction of lithium-ion batteries for electric vehicles

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 inaccurate prediction results and single test items.

Active Publication Date: 2022-05-10
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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  • A method for all-climate calendar life prediction of lithium-ion batteries for electric vehicles

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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 a method for predicting the full-climate calendar life of a lithium-ion battery for an electric vehicle, comprising the following steps: S1, establishing a thermal-electrochemical coupling simulation model of a lithium-ion battery including a positive and negative side reaction sub-model; Lithium-ion batteries are subjected to shelving experiments under different conditions, and the condition parameters are input into the simulation model established in S1; S3, the battery performance of the shelving experiment in step S2 is measured, and the model parameters are adjusted and optimized according to the battery performance; S4, Determine the temperature dependence of the side reaction; S5. Run the computer simulation model to obtain the performance prediction results of different life stages including the impact of the whole climate. The full-climate calendar life prediction method for lithium-ion batteries for electric vehicles described in the present invention can predict the rate charge and discharge performance, power performance, and temperature performance of the battery at different life stages, and can provide useful and necessary data for the BMS system and 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...

Claims

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Application Information

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Patent Type & Authority Patents(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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