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A 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 large amount of manual participation, difficulty in realizing continuous detection of battery performance, complex physical and chemical analysis methods, etc., and achieve less manual participation , Realize the effects of automatic detection, strong operability and practicality

Active Publication Date: 2018-11-23
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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  • A detection method of composite electrode state
  • A detection method of composite electrode state
  • A detection method of composite electrode state

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Embodiment Construction

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

[0039] First, according to the electrochemical model of the lithium ion battery, the relationship between the internal parameters and external characteristics of the composite electrode is simplified: the electricity released by the composite electrode is shared by the active materials it contains:

[0040] Cap=Cap 1 +Cap 2

[0041] Therefore, in the entire 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 electricity, the electricity released by the active material is equal to the amount of lithium released:

[0044]

[0045]

[0046]

[0047]

[0048]

[0049]

[0050]

[0051]

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[0053]

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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 method for detecting the state of a composite electrode, in particular to a method for nondestructive testing of the composite electrode composition. Background technique [0002] After long-term development, lithium-ion batteries have become a major energy storage element. With the widespread application of lithium ion, people have put forward higher requirements for its capacity performance, power performance, safety performance, cycle performance, and cost. A single material can often only meet part of the needs of batteries. The preparation of composite electrodes to combine the advantages of various materials to meet the needs of all aspects of batteries has become an important direction in the field of battery research. [0003] Lithium-ion battery is a encapsulated black box, and its performance and changes are caused by changes in its internal parameters. There are currently two main methods for detecting the internal stat...

Claims

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Application Information

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Patent Type & Authority Patents(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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