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Lithium battery charge state online estimating method

A state-of-charge, lithium battery technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problems of large cumulative error and difficult implementation of the ampere-hour integration method

Active Publication Date: 2016-09-21
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

It should be noted that the ampere-hour integration method has a large cumulative error and must be corrected regularly, while the open circuit voltage method can only obtain accurate results after the battery has been left to stand for a long time, that is, offline correction, which is relatively difficult in practical applications. Difficult to achieve

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  • Lithium battery charge state online estimating method
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  • Lithium battery charge state online estimating method

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Embodiment Construction

[0051] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0052] Such as figure 1 Shown is the flow chart of the lithium battery SOC online estimation method, which specifically includes:

[0053] (1) The initial value of the SOC of the lithium battery is given arbitrarily, and the estimated value of the open circuit voltage of the battery is obtained by using the composite empirical formula model

[0054] (2) Will Lithium battery current I bat ...

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Abstract

The invention discloses a lithium battery state of charge (SOC) online estimating method. The online estimating method is characterized in that based on an expanded Kalman filtering method and combined with a TS fuzzy principle, a lithium battery real-time parameter open-circuit voltage UOC is precisely estimated, and the precise estimation of the lithium battery SOC is further realized. The method comprises the steps of: establishing a lithium battery improved dual-RC equivalent circuit model, utilizing an online TS fuzzy model to precisely calculate the battery open-circuit voltage UOC, and utilizing the expanded Kalman filtering method to estimate the lithium battery SOC in real time. Based on the estimation of the lithium battery SOC, the precision of the lithium battery SOC estimation meets predetermined requirements, the application of the TS fussy model also improves the precision of the lithium battery SOC estimation, and the high speed and the timeliness of the online estimation are also ensured.

Description

technical field [0001] The invention belongs to the technical field of battery energy storage, and in particular relates to a method for estimating the state of charge (SOC) of a lithium battery. Background technique [0002] In recent decades, the research and development of electric energy storage technology has been valued by the energy, transportation, electric power, communication and other departments of various countries. Under the background of the rapid development of new energy technology, if energy storage devices can be equipped in new energy power generation equipment such as fuel cell power generation and wind power generation, on the one hand, the output curve of the unit can be adjusted through the energy storage element to solve the problem of new energy. The problem of randomness and uncontrollability of power generation itself can reduce the impact of new energy output changes on the power grid; on the other hand, it can store electric energy when the powe...

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Application Information

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IPC IPC(8): G01R31/36
CPCG01R31/387
Inventor 蒋建华陈明渊李曦洪升平许元武李箭
Owner HUAZHONG UNIV OF SCI & TECH
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