Lithium ion power battery aging state identification and open-circuit voltage reconstruction method
An aging state, power battery technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of battery overall performance decline, prolonging the identification process of aging state, and the inability of the battery to evaluate the aging state of the battery more deeply.
Pending Publication Date: 2020-10-16
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology
The mechanism of battery aging is complex. During use, the positive and negative electrodes may be aging, which together leads to the decline of the overall performance of the battery. Only the overall capacity and internal resistance of the battery cannot be used to evaluate the aging state of the battery in depth.
In addition, the open-circuit voltage-state-of-charge curve of the battery is often used to calibrate the state-of-charge of the battery. The update of the curve under different aging states also requires long-term testing, which greatly prolongs the identification process of the aging state.
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[0025] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0026] The aging state identification and open circuit voltage reconstruction method of lithium ion power battery provided by the present invention, such as figure 1 As shown, it specifically includes two stages of offline battery test and online application;
[0027] Among them, the offline battery test phase includes the following steps:
[0028] Step 1. Select the sample lithium-ion battery to be studied, and test its battery constant current charging curve and open circuit voltage (OCV) curve under differ...
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The invention discloses a lithium ion power battery aging state identification and open-circuit voltage reconstruction method. According to the method, the important significance of rapidly obtainingan open-circuit voltage-state-of-charge curve for improving battery aging state recognition and state-of-charge estimation in a full-life interval is considered, and the characteristic that a common battery constant-current or constant-current constant-voltage charging mode can provide consistent input for a machine learning method is considered. The method focuses on two problems of battery internal aging state estimation and open-circuit voltage acquisition. A common partial charging voltage curve in the constant-current charging process is used, the relation between the partial charging voltage curve and the positive and negative electrode capacities and the initial state of charge of the battery is established offline in combination with a machine learning method, and rapid estimationof the internal aging state of the battery and accurate reconstruction of the open-circuit voltage-state of charge curve of the battery can be realized.
Description
technical field [0001] The invention relates to the technical field of power battery system management, in particular to the aging diagnosis and open-circuit voltage curve reconstruction method design of lithium-ion power batteries. Background technique [0002] During the long-term use of lithium-ion power batteries, the performance of lithium-ion power batteries generally declines gradually, which will adversely affect the performance of the power battery system. Therefore, accurate acquisition of battery aging status is of great significance to the durability and reliability management of battery systems. . The diagnosis of battery aging mechanism often requires testing the battery, such as small rate open circuit voltage test and electrochemical impedance spectroscopy test. However, this kind of test takes a long time and has high environmental requirements, so it is not suitable for actual battery application scenarios. Therefore, it is of great significance to estima...
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Login to View More IPC IPC(8): G01R31/367G01R31/378G01R31/392G01R31/388
CPCG01R31/367G01R31/378G01R31/392G01R31/388Y02E60/10
Inventor熊瑞田金鹏卢家欢
OwnerBEIJING INSTITUTE OF TECHNOLOGYGY