Method and system for quantifying health state of battery based on SOC section estimation

A technology of health status and quantification method, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve problems such as limitations, and achieve the effect of improving limitations, improving functions, and reducing the probability of sudden changes in battery performance

Active Publication Date: 2018-06-01
株洲广锐电气科技有限公司 +1
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Problems solved by technology

The evaluation of battery performance mainly relies on the SOC estimation of the battery management system and the measurement of the voltage of the battery pack, the battery temperature, the voltage difference between the single cells, and the temperature difference of the battery pack. The evaluation basis is relatively limited, and this This evaluation method is very dependent on the knowledge and experience level of professional and technical personnel

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  • Method and system for quantifying health state of battery based on SOC section estimation

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Embodiment 1

[0022] This embodiment discloses a method for quantifying battery health status, including:

[0023] Taking the charging rate as the core, and considering the internal resistance of the battery, remaining power and temperature factors, the health status SOH evaluation model is constructed as follows:

[0024]

[0025] Among them, λ is the charging rate correction constant, C(t) is the actual charging rate, C is the ideal charging rate, ε is the weight coefficient of the evaluation method based on the charging rate, and α is the weight coefficient of the evaluation method based on the internal resistance of the battery , β is the weight coefficient of the evaluation method based on the remaining battery power, SOC(t) is the measured capacity of the battery in the current charging state, SOC is the nominal capacity of the battery, and δ is the weight coefficient of the evaluation method based on the battery charging temperature, T 平均 is the average temperature of the battery...

Embodiment 2

[0041] Corresponding to the above method, this embodiment discloses a battery health status quantification system, including a memory, a processor, and a computer program stored in the memory and operable on the processor, wherein the processor implements the above-mentioned method steps.

[0042] To sum up, the effective evaluation method and system for the battery health state disclosed in the embodiment of the present invention, on the one hand, SOC estimation is carried out in different intervals, which improves the fine-grained SOC estimation; on the other hand, in each SOC estimation interval, the hierarchical analysis The method determines the estimation model, which makes up for the limitation of a single SOC estimation method and further improves the accuracy of SOC estimation. Moreover, the present invention comprehensively evaluates various factors affecting battery performance, can more accurately evaluate the health status of the storage battery, and also effectiv...

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Abstract

The invention relates to the technical field of battery detection, and discloses a method and system for quantifying the health state of a battery based on SOC section estimation, so as to improve thefunctions of a battery management system and to provide convenience for the battery management system to evaluate the battery state in real time. The method of the invention comprises comprehensivelyevaluating the health of the battery by using an analytic hierarchy process by using a charging rate as a core in combination with the internal resistance of the battery, and based on the remaining power based on SOC section estimation and the temperature factor. The method and the system for evaluating the battery health state comprehensively evaluate various factors that affect the battery performance, reduce a battery performance change probability during the later use of the battery, and can easily evaluate the performance state and the service life of a battery pack. In addition, the evaluation method can be integrated into the battery management system to improve the functions of the battery management system. The battery management system can conveniently perform routine maintenance detection and evaluation on the battery state in real time.

Description

technical field [0001] The invention relates to the technical field of storage battery detection, in particular to a method and system for quantifying battery health status based on SOC partition estimation. Background technique [0002] Battery state of health (SOH) assessment, as one of the key tasks of battery state assessment, has attracted more and more attention from researchers at home and abroad. [0003] At present, the common methods for evaluating the health status of vehicle power batteries are all realized by estimating and identifying the internal parameters of the battery. It is mainly divided into the following two categories: one is to evaluate the battery health status by estimating the rated capacity of the battery, and the other is to evaluate the battery health status by estimating the internal resistance of the battery. However, it is difficult to obtain the accurate rated capacity and internal resistance of the battery in practice, and it is difficult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/387G01R31/392
Inventor 王吉桥丁带劲谢飞余楚伟郑斌刘锡斌
Owner 株洲广锐电气科技有限公司
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