Multi-time-scale square lithium battery SOC and SOT joint estimation method

A multi-time scale, joint estimation technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problems of capturing and monitoring the thermal characteristics of unfavorable lithium batteries, and achieve reduced modeling difficulty, good robustness, and improved estimation The effect of precision

Active Publication Date: 2020-04-03
CHONGQING UNIV +1
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Problems solved by technology

However, for square lithium batteries, the assumption of uniform heat generation or concentrated heat source will introduce a large model error, which is not conducive to the capture and monitoring of the thermal characteristics of lithium batteries

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  • Multi-time-scale square lithium battery SOC and SOT joint estimation method
  • Multi-time-scale square lithium battery SOC and SOT joint estimation method
  • Multi-time-scale square lithium battery SOC and SOT joint estimation method

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[0053] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic concept of the present invention, and the following embodiments and the features in the embodiments can be combined with each other in the case of no conflict.

[0054] Wherein, the accompanying drawings are for illustrative purposes only, and represent only schematic diagrams, rather than physical drawings, and should...

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Abstract

The invention relates to a multi-time-scale square lithium battery SOC and SOT joint estimation method, and belongs to the technical field of battery management. The method is realized on the basis ofa control-oriented square lithium battery electro-thermal coupling model in combination with an advanced multi-time scale estimation algorithm. The method comprises the following steps of determiningheat production related parameters in an electric model in advance through experiments, acquiring other parameters of the electric model through online parameter identification, and then achieving SOC estimation at the current moment in combination with an observer; according to the SOC and the temperature value of the previous moment, determining the heat production rate of each discrete volumeunit of the battery, and obtaining the temperature distribution of the current moment; and then updating electric model parameters by utilizing the current temperature and the SOC value, determining the heat production rate of the discrete volume unit, and iteratively updating the SOC value and the SOT value in this way. The estimation precision and the calculation resource utilization condition can be well balanced, and strong-robustness, high-fault-tolerance, accurate and efficient lithium battery electric heating characteristic monitoring under different time scales is realized.

Description

technical field [0001] The invention belongs to the technical field of battery management, and relates to a joint estimation method of SOC and SOT of a square lithium battery with multiple time scales. Background technique [0002] At present, there have been many studies on the estimation of SOC or SOT of lithium batteries alone. Common SOC estimation methods are mainly ampere-hour integration method, open circuit voltage method, data-driven method, model-based method and some hybrid methods. Due to the ease of implementation, the ampere-hour integration method, the model-based method, and some simple hybrid methods, such as the combination of the ampere-hour integration method and the open-circuit voltage method, are widely used now. Common SOT estimation methods mainly include methods based on EIS measurements, methods based on simplified thermal models, methods based on data-driven methods, and methods combining EIS measurements and simplified thermal models. The curre...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/367
CPCG01R31/367
Inventor 胡晓松刘文学谢翌刘波李佳承
Owner CHONGQING UNIV
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