Detection method of composite electrode state

A composite electrode and detection method technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of complex physical and chemical analysis methods, difficulty in realizing continuous detection of battery performance, and large amount of manual participation, so as to achieve less manual participation , Realize the effects of automatic detection, strong operability and practicality

Active Publication Date: 2017-02-15
SHANGHAI POWER ENERGY STORAGE BATTERY SYST ENG TECH
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Problems solved by technology

The physical and chemical analysis methods are complicated, and the amount of manual participation is large, so it is difficult to realize the continuous detection of battery performance

Method used

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  • Detection method of composite electrode state
  • Detection method of composite electrode state
  • Detection method of composite electrode state

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Embodiment Construction

[0038] The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, and are not intended to limit the protection scope of the present invention.

[0039] First, according to the electrochemical model of lithium-ion batteries, the relationship between the internal parameters and external characteristics of the composite electrode is simplified: the electricity released by the composite electrode is jointly borne by the active materials contained in it:

[0040] Cap = Cap 1 +Cap 2

[0041] Therefore, in the whole working range, the electricity released by the composite electrode has the following relationship:

[0042] cap a = Cap 1，a +Cap 2，a

[0043] According to the conservation of charge, the charge released by the active material is equal to the amount of lithium it deintercalates:

[0044]

[0045]

[0046]

[0047]

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Abstract

The invention discloses a detection method of a composite electrode state. The method comprises: step one, a lithium ion battery electrochemical model of a composite electrode is established and simplification is carried out to obtain a relationship, shown by two formulas, between internal parameters and external features of the composite electrode, wherein in the relationship, Cap expresses an electric quantity released during a battery testing process, Capa expresses an electricity quantity released in a battery testing zone, DOD expresses a discharging depth during the battery testing process, y1- and y2- express average lithium insertion amounts of a first active material and a second active material in the battery, y1,0- and y2,0- express initial lithium insertion amounts of the first active material and the second active material in the battery, and Dy1- and Dy2- express lithium insertion amount changing ranges of the first active material and the second active material in the battery testing zone; and step two, external features are measured and calculation is carried out based on a parameter identification method to obtain internal parameter information. According to the provided method, internal state detection of the composite electrode is realized under the circumstance that the battery is not damaged. The method that can be applied to any composite electrode system has high operability and practicality.

Description

technical field [0001] The invention relates to a detection method for the state of a composite electrode, in particular to a nondestructive detection method for the composition of the composite electrode. Background technique [0002] After long-term development, lithium-ion batteries have become a major energy storage component. With the wide application of lithium ions, people put forward higher requirements for its capacity performance, power performance, safety performance, cycle performance and cost. A single material can only meet part of the needs of the battery. It has become an important direction in the field of battery research to synthesize the advantages of various materials by preparing composite electrodes to meet the needs of all aspects of the battery. [0003] The lithium-ion battery is a packaged black box, and its working performance and its changes are caused by changes in its internal parameters. At present, there are two main methods for detecting t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/367
Inventor 吕桃林罗英罗伟林晏莉琴刘辉解晶莹
Owner SHANGHAI POWER ENERGY STORAGE BATTERY SYST ENG TECH
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