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Lithium battery health state estimation method based on secondary difference temperature characteristics

A health state, quadratic difference technology, applied in the direction of calculation, measurement of electricity, measurement of electrical variables, etc., can solve problems such as low prediction efficiency and complex health characteristics, to increase diversity and convenience, improve simplicity and panoply. the effect of reducing measurement noise

Active Publication Date: 2022-04-08
SICHUAN UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of complex health characteristics and low prediction efficiency in the current lithium battery SOH estimation method, and propose a lithium battery health state estimation method based on the secondary differential temperature characteristics

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  • Lithium battery health state estimation method based on secondary difference temperature characteristics
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  • Lithium battery health state estimation method based on secondary difference temperature characteristics

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Embodiment Construction

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below, obviously, the described embodiments are only some of the embodiments of the present invention, not all of the embodiments.

[0031] refer to Figure 1-5 , a lithium battery state-of-health estimation method based on quadratic differential temperature features, comprising the following steps:

[0032] S1: Obtain and calculate: Obtain temperature, time, and voltage data from the lithium battery discharge process, and calculate the first-order finite difference DT of temperature with respect to time, the calculation formula is , where T is the temperature in the charging phase, k is the time corresponding to the data, L 1 is the selected sampling interval length;

[0033] S2: Data processing: The obtained first-order finite difference DT is processed by Gaussian filtering, and the formula of a one-dimensional Gaussian function with zero mean value is ,i...

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Abstract

The invention relates to the technical field of power lithium battery application, in particular to a lithium battery SOH (state of health) estimation method based on secondary difference temperature characteristics, and provides a scheme for solving the problem of low estimation accuracy of a current lithium battery SOH estimation method, which comprises the following steps: S1, obtaining and calculating, S2, processing data, S3, processing a curve, and S5, calculating the state of health of a lithium battery. The invention aims to provide the lithium battery health state estimation method based on the quadratic difference temperature characteristics, the aging trend of the lithium battery is accurately and efficiently reflected through the method of calculating the second-order finite difference for the temperature, the diversity of the health characteristics of an SOH estimation model is increased, and the estimation accuracy of the lithium battery health state is improved. And the accuracy and convenience of the SOH estimation method based on data driving are improved.

Description

technical field [0001] The invention relates to the technical field of power lithium battery applications, in particular to a method for estimating the state of health of lithium batteries based on secondary differential temperature characteristics. Background technique [0002] Power lithium batteries have the advantages of high energy, light weight, and long service life, so they are widely used in new energy vehicles, electric energy storage and other fields. However, the performance degradation caused by the aging of lithium batteries brings safety hazards to the operation of lithium battery equipment. Therefore, in terms of ensuring the safe use of battery packs and the stable operation of equipment, it is of great significance to accurately estimate the state of health (State of Health, SOH) of power lithium batteries. Among the current mainstream methods for lithium battery SOH estimation, the data-driven method has become a popular method because it does not need to...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23G06Q10/04G06Q10/06G06Q50/06G06F17/11G01R31/392G01R31/367
Inventor 曾昱升孟锦豪彭纪昌刘平
Owner SICHUAN UNIV
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