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Lithium ion battery system SOC estimation method

A lithium-ion battery and battery system technology, applied in the field of battery systems in the new energy vehicle industry, can solve the problems of insufficient battery discharge capacity factors and inaccurate calculation methods, so as to reduce terminal error corrections or inaccurate corrections, and improve estimation accuracy Effect

Active Publication Date: 2017-02-22
TIANJIN ENERGIES
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Problems solved by technology

The calculation methods of these estimation methods are not accurate enough, and the environmental factors affecting the battery discharge capacity are not comprehensive enough

Method used

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  • Lithium ion battery system SOC estimation method
  • Lithium ion battery system SOC estimation method
  • Lithium ion battery system SOC estimation method

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Embodiment Construction

[0020] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0021] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0022] Such as figure 1 As shown, this estimation method includes static SOC-OCV correction. After the battery system is powered on, it will determine whether to perform SOC-OCV correction according to the last power-on time and the static current value. When the quiescent current is 0A, the single database model that has been added in the system will be called for SOC correction. The battery management system has the function of recording the number of charge and discharge times. When the SOC is corrected, the data in the battery database model will be called according to the number of charge and discharge times of the system.

[0023] The monomer database model includes: capacity dat...

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Abstract

The invention provides a lithium ion battery system SOC estimation method. By adding battery single-body life data and different temperature and different multiplying power of charge and discharge data, a battery single-body database model is established; and the method can independently estimate any single-string SOC value of the system and has the strategy of charge and discharge terminal multi-condition joint participation of SOC correction to achieve an effect of accurately estimating the SOC value of the battery system. The method can independently estimate any single-string SOC value of the battery system; through the battery single-body database model, system SOC estimation precision is greatly improved; and through charge and discharge terminal multi-condition joint participation of SOC value correction, the cases of terminal error correction or incorrect correction are reduced effectively.

Description

technical field [0001] The invention belongs to the technical field of battery systems in the new energy automobile industry, and in particular relates to a method for estimating the SOC of a lithium-ion battery system. Background technique [0002] With the development of the global economy and the increasingly prominent issues of energy and environmental protection, the automobile industry is transforming into an energy-saving green automobile industry. Electric vehicles have become one of the main directions for the development of energy-saving and environmentally friendly automobiles due to their advantages of zero emissions and low noise. Battery management system (BMS) is one of the core components of electric vehicles, and the remaining state of charge (SOC) estimation is the key and difficult point of BMS. The accuracy of SOC estimation directly affects the cruising range of electric vehicles, battery system life, battery system safety, and battery system control str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/387
Inventor 陈超王驰伟
Owner TIANJIN ENERGIES
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