Lithium battery SOH estimation system and method based on self-circulation correction
A lithium battery, self-circulating technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of divergent prediction results, high time cost, and poor practicability, and achieve the goal of improving accuracy and reliability Effect
Inactive Publication Date: 2020-03-27
SICHUAN CHANGHONG ELECTRIC CO LTD
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In the prior art, there is also a scheme for modeling the battery and then predicting the SOH for the model. For example, "SOC / SOH prediction method for power battery based on big data self-learning mechanism" proposed by CN201510532492.3 adopts the modeling method , and then carry out SOH prediction, but the time cost of battery modeling is high and the practicability is not strong. At the same time, the prediction algorithm used cannot guarantee the convergence of the data, which may cause the prediction results to diverge
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[0024] The purpose of the present invention is to propose a lithium battery SOH estimation system and method based on self-circulation correction. Through the self-circulation correction of the SOH estimation value, the accuracy of lithium battery SOH estimation can be improved on the premise of ensuring the convergence of the prediction results, and the battery performance can be improved. Manage system reliability.
[0025] Such as figure 1 As shown, the lithium battery SOH estimation system based on self-circulation correction in the present invention includes a data acquisition module, an SOH value estimation module, and a self-circulation correction module, as follows:
[0026] (1) The data acquisition module is responsible for collecting data such as current, voltage, temperature, operating time, and cycle times of the battery as a basis for estimating the SOH value of the lithium battery.
[0027] (2) The SOH value estimation module is responsible for estimating the SO...
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The invention relates to the technical field of battery management, discloses a lithium battery SOH estimation system and method based on self-circulation correction, and improves the accuracy of lithium battery SOH estimation and the reliability of a battery management system through self-circulation correction of an SOH estimation value on the premise of ensuring convergence of a prediction result. The system comprises: a data acquisition module used for acquiring operation data of a lithium battery system; an SOH estimation module for performing SOH estimation by utilizing the operation data of the lithium battery system; and a self-circulation correction module which is used for comparing an error between the SOH estimated value and pre-acquired cyclic charging and discharging experimental data of the same batch of batteries through self-circulation charging and discharging data analysis, and correcting the SOH of the batteries.
Description
technical field [0001] The invention relates to the technical field of battery management, in particular to a lithium battery SOH estimation system and method based on self-circulation correction. Background technique [0002] In recent years, with the increasingly severe energy problems and environmental pollution problems, energy saving and emission reduction, and finding alternative fuels have become more and more concerned issues in various countries. New energy technology is playing an increasingly important role in the energy industry and automobile industry because of its characteristics of energy saving, environmental protection and recycling. [0003] Lithium-ion battery, as an important energy storage device, has been the focus of new energy technology research since its appearance in the 1970s due to its high energy density, low self-discharge rate, and strong stability. The battery state of health (SOH) is the ratio of the battery's current charge capacity to th...
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IPC IPC(8): G01R31/378G01R31/387
CPCG01R31/378G01R31/387
Inventor 孟令锋周迅黄勇廖红
Owner SICHUAN CHANGHONG ELECTRIC CO LTD