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State of health (SOH) value assessment method of battery pack

A technology for battery packs and battery cells, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as limitations, and achieve the effect of perfect functions and convenient evaluation

Active Publication Date: 2012-06-27
HUIZHOU EPOWER ELECTRONICS
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  • Abstract
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AI Technical Summary

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

Method used

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Embodiment Construction

[0017] In order to facilitate those skilled in the art to understand, the present invention will be described in further detail below in conjunction with embodiment:

[0018] The battery pack SOH value (battery pack health state) evaluation method proposed in this embodiment includes multiple steps, including a combination of battery capacity-based SOH value evaluation steps and battery internal resistance SOH value evaluation steps, or a combination of battery capacity and SOC value The combination of the SOH value evaluation step and the SOH value evaluation step based on the internal resistance of the battery;

[0019] Among them, the battery capacity-based SOH value evaluation step is to obtain the battery capacity-based SOH value of each battery cell in the battery pack, and use the minimum value of the obtained SOH values ​​as the battery capacity-based SOH value of the battery pack; expressed as : Based on the battery capacity SOH value=min{SOH[1], ...,SOH[n]}, SOH[i] i...

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Abstract

A state of health (SOH) value assessment method of a battery pack includes combination of a SOH value assessment step based on battery capacity and a SOH value assessment step based on battery inner resistance or combination of a comprehensive SOH value assessment step based on a battery capacity and a stress optical coefficient (SOC) value and the SOH value assessment step based on battery inner resistance. The invention further provides an effective assessment method for battery health status, which facilitates assessment on performance state and service life of the battery pack. Simultaneously, the assessment method can be integrated in a battery management system so as to perfect functions of the battery management system and facilitate real-time assessment on the battery status by the battery management system.

Description

technical field [0001] The invention relates to a method for evaluating the SOH value of a battery pack. Background technique [0002] As an important energy storage unit, the life of the battery will gradually decay and its performance will gradually deteriorate during continuous use; when the batteries are used in groups, the service life and performance of the battery The performance of the battery after the pack will become more complicated due to the performance of the individual cells themselves and the differences between the individual cells. [0003] The service life and performance status of the battery pack are not only related to the stability of the electrochemical system inside the battery, but also related to the use environment and working conditions of the battery pack, especially the charge and discharge rate and operating temperature. Excessive charge and discharge rate will accelerate the life of the battery pack. Under different operating temperatures,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 刘飞阮旭松文锋盛大双
Owner HUIZHOU EPOWER ELECTRONICS
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