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A life prediction and evaluation method and system for a lithium battery system of an electric vehicle

A system life, lithium battery technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of not considering the disclosure of the whole vehicle, and not being able to directly obtain the battery system life prediction results

Active Publication Date: 2022-05-03
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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Problems solved by technology

This method predicts the life of a single battery cell, without considering the disclosure of the entire vehicle, and cannot directly obtain the life prediction result of the battery system

Method used

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  • A life prediction and evaluation method and system for a lithium battery system of an electric vehicle
  • A life prediction and evaluation method and system for a lithium battery system of an electric vehicle
  • A life prediction and evaluation method and system for a lithium battery system of an electric vehicle

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Embodiment Construction

[0080] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are part of the present invention Examples, not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0081] This embodiment discloses a life prediction and evaluation method for a lithium battery system of an electric vehicle, such as figure 1 As shown, the method includes three dimension parameter inputs, four hierarchical evaluation models and one indicator result output. Three-dimensional parameter input includes: system parameters (total power and cruising range), working c...

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Abstract

The invention discloses a life prediction and evaluation method for a lithium battery system of an electric vehicle. According to system parameters and working condition parameters, combined with a set working condition distribution probability model, the specific working conditions of the whole vehicle are randomly simulated, and the characteristics of each working condition are counted. distributed. The battery life parameters and statistical operating condition distribution are input into the battery life model, and the calendar life curve and cycle life curve of the system under this working condition can be obtained through a weighting algorithm. The vehicle parameters and statistical operating condition distribution are input into the cruising range correction model, and the cruising range is corrected in three aspects: energy efficiency, energy consumption of accessories and load impact. Finally, the system life iterative model integrates all parameters and data, predicts the life of the system and obtains a confidence interval. The present invention combines the life parameters of single battery cells in the life prediction of the whole vehicle, and considers the influence of the operating conditions of the whole vehicle on the life of the system. The cruising range is corrected to realize the prediction and evaluation of the service life of the lithium battery system.

Description

technical field [0001] The invention relates to the technical field of new energy vehicles, in particular to a method and system for predicting and evaluating the life of a lithium battery system of an electric vehicle. Background technique [0002] As a new generation of green energy, lithium-ion batteries are widely used in electric vehicles and energy storage systems because of their advantages such as high energy density, high working voltage, and long cycle life. As the core component of electric vehicles, the performance of the lithium battery system plays a vital role in the use of the whole vehicle. It needs to be fully studied to ensure the economic life of the battery pack and the reliability during its life. The battery system is most concerned about the degradation of battery capacity. [0003] Among them, the attenuation of lithium batteries can be divided into two parts: calendar attenuation and cycle attenuation. Calendar attenuation is affected by ambient t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/392G01R31/382G01R31/396
CPCG01R31/392G01R31/382G01R31/396
Inventor 赵长军厉运杰周祥杨思文
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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