Joint estimation method for SOH (state of health) of lithium ion battery

A technology for lithium-ion batteries and state of health, applied in the measurement of electricity, measurement of electrical variables, instruments, etc., can solve the problems of large SOH estimation errors, large SOH limitations, complex electrochemical reactions, etc., to shorten the time and improve the estimation. Accuracy and strong engineering promotion and applicability

Active Publication Date: 2017-09-01
SHANDONG UNIV
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Problems solved by technology

Since the ohmic internal resistance itself is small, such as tens of milliohms, it is susceptible to interference such as contact resistance generated by battery cells, resulting in a large SOH estimation error
[0007] In fact, because the electrochemical reaction inside the battery is very complex, the use of a single battery characteristic parameter to judge SOH has great limitations and low estimation accuracy.

Method used

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  • Joint estimation method for SOH (state of health) of lithium ion battery
  • Joint estimation method for SOH (state of health) of lithium ion battery
  • Joint estimation method for SOH (state of health) of lithium ion battery

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[0037] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0038] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0039] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinatio...

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Abstract

The invention discloses a joint estimation method for SOH (state of health) of a lithium ion battery. Internal resistance and capacity of the battery and various external characterization quantities of a discharge curve are obtained with specific testing methods respectively, and the current SOH of the battery is judged jointly by integrating the characterization quantities. The joint estimation method for the SOH is provided on the basis of a large number of experiments and summaries in order to solve the problems that the conventional estimation method for the SOH of the battery consumes long time, has large error and the like, the SOH evaluation time can be shortened, limitations of the conventional single parameter based determination method can be avoided, the SOH estimation precision can be improved, and the joint estimation method can be popularized and applied to engineering practice and other types of batteries.

Description

technical field [0001] The invention relates to a method for jointly estimating the state of health of a lithium ion battery. Background technique [0002] Electric motor vehicles are an important way to solve the problem of environmental pollution, and have been rapidly developed and applied in our country. The battery system is the power source of electric vehicles. At present, lithium-ion power batteries are widely used due to their outstanding advantages such as high energy density, long cycle life, and no memory effect. Accurate estimation of parameters such as the state of charge (SOC) and state of health (SOH) of the power battery pack is a prerequisite for efficient, safe and reliable operation of electric vehicles. At present, the estimation method of SOC is relatively mature, but for SOH, there is no standard definition, and generally only a single parameter such as capacity, power, and impedance is used to characterize it, and the estimation accuracy is low. ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 段彬康永哲张承慧周忠凯朱瑞
Owner SHANDONG UNIV
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