Lithium ion battery charging lithium precipitation real-time detection method and system

A lithium-ion battery and detection method technology, applied in the field of lithium-ion batteries, can solve the problems of complex operation and low efficiency of detection and analysis of lithium, and achieve the effects of simple and efficient operation, improved service life and safety performance, and high detection accuracy

Pending Publication Date: 2020-09-08
TIANNENG SAFT ENERGY JOINT CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a real-time detection method and system for lithium ion battery charging and analysis, to solve the problems of complex operation and low efficiency of detecting lithium analysis in the prior art when detecting charging lithium ion battery analysis.

Method used

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  • Lithium ion battery charging lithium precipitation real-time detection method and system
  • Lithium ion battery charging lithium precipitation real-time detection method and system
  • Lithium ion battery charging lithium precipitation real-time detection method and system

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Embodiment 1

[0025] Please refer to the attached figure 1 and 2 , is a schematic flow chart of a lithium ion battery detection method provided in an embodiment of the present invention. This method is suitable for the scene of lithium ion detection at the negative electrode during lithium ion charging. The method specifically includes the following steps:

[0026] Take 8 NCM-18650 2.0Ah batteries, and conduct intermittent charging tests at different rates (0.2C, 0.5C, 1C and 2C) in a low temperature (10°C) environment. When the power increases by 1%, the SOC is disconnected for 3 seconds, and the collection is interrupted. Periodic voltage change (dV), current change (dI), calculate the resistance value (ZTR) through Ohm's law (dU / dI), draw the distribution curve of ZTR with charging capacity, and judge the lithium-ion battery according to the distribution curve of ZTR with charging capacity The internal lithium analysis state, the results are shown in Table 1 below.

Embodiment 1

[0027] Table 1 Example 1 Lithium-ion battery internal lithium analysis state

[0028]

[0029] The technical solution provided by the embodiment of the present invention can accurately detect the lithium ionization of the negative electrode of the lithium-ion battery at low temperature (10° C.) through the processing and analysis of the data, thereby avoiding the detection error caused by human subjectivity, and also avoiding the Lithium separation at the negative electrode affects the safety of the battery, improves the service life and safety performance of the lithium-ion battery, is easy and efficient to operate, and has high detection accuracy.

Embodiment 2

[0031] Take 8 NCM-18650 2.0Ah batteries, and conduct intermittent charging tests at different rates (0.2C, 0.5C, 1C and 2C) at room temperature (25°C). Every time the power increases by 1%, the SOC is disconnected for 3 seconds, and the collection is interrupted. Periodic voltage change (dV), current change (dI), calculate the resistance value (ZTR) through Ohm's law (dU / dI), draw the distribution curve of ZTR with charging capacity, and judge the lithium-ion battery according to the distribution curve of ZTR with charging capacity The internal lithium analysis state, the results are shown in Table 2 below.

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Abstract

The invention belongs to the technical field of lithium ion batteries. The invention particularly relates to a lithium ion battery charging lithium precipitation real-time detection method and system.The method comprises the following steps of: carrying out intermittent charging test on a lithium ion battery; when the electric quantity is increased by 1%, an SOC is switched off for 3s, the intermittent period voltage change (dV) and current change (dI) are collected, a resistance value (ZTR) is calculated through the ohm law (dU/dI), a distribution curve of the ZTR along with the charging capacity is drawn, and the lithium precipitation state in the lithium ion battery is judged according to the distribution curve of the ZTR along with the charging capacity. The system comprises a test acquisition module, a data processing module and a lithium precipitation judgment module. The negative electrode lithium precipitation of the lithium ion battery can be accurately detected at a low temperature (10 DEG C), detection errors caused by artificial subjectivity are avoided, the service life of the lithium ion battery is prolonged, the safety performance of the lithium ion battery is improved, operation is easy, convenient and efficient, and the detection precision is high.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a real-time detection method and system for charging and analyzing lithium of lithium-ion batteries. Background technique [0002] As a new type of green energy, lithium-ion batteries have received more and more attention in recent years. With the continuous expansion of the application range of lithium-ion batteries, the requirements for their application conditions have become more stringent, and the lithium-ion battery industry has followed What must be solved is how to improve the cycle performance and high-rate charging performance of lithium batteries at low temperatures. At present, the anode material of lithium-ion battery is mainly graphite carbon material. When charging at low temperature or at a high rate, a large polarization will be caused inside the battery, and continuous polarization will easily cause lithium precipitation in the battery,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/3842G01R31/388G01R31/378H01M10/42
CPCG01R31/378G01R31/3842G01R31/388H01M10/4285Y02E60/10
Inventor 张磊秦作路孙伟李明钧周建中
Owner TIANNENG SAFT ENERGY JOINT CO
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