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Method and system for detecting lithium metal separation of lithium ion battery

A lithium-ion battery, detection method technology, applied in the direction of measuring electricity, measuring device, measuring electrical variables, etc., can solve the problems of low efficiency of lithium precipitation, complicated operation, etc., to improve service life and safety performance, easy and efficient operation, The effect of high detection accuracy

Inactive Publication Date: 2018-11-06
JIANGSU TAFEL NEW ENERGY TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method and system for detecting lithium analysis of lithium-ion batteries, so as to solve the problems in the prior art that the operation is complicated and the efficiency of detecting lithium analysis is low when detecting the lithium analysis of rechargeable lithium-ion batteries

Method used

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  • Method and system for detecting lithium metal separation of lithium ion battery
  • Method and system for detecting lithium metal separation of lithium ion battery
  • Method and system for detecting lithium metal separation of lithium ion battery

Examples

Experimental program
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Embodiment 1

[0046] Please refer to the attached figure 1 , is a schematic flow chart of a lithium ion battery detection method provided in Embodiment 1 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 is implemented by a lithium ion battery detection system. Execution, the device can be implemented by software and / or hardware, and integrated inside the battery management platform. The method specifically includes the following steps:

[0047] S101. Perform a charging test on the lithium-ion battery, and collect voltage and capacity data of the lithium-ion battery during the charging test.

[0048] In this embodiment, the charging test of the lithium-ion battery has certain requirements on the accuracy of the equipment, for example, the voltage accuracy must be greater than or equal to 0.5‰.

[0049] It should be noted that during the charging phase of lithium-ion batteries, the pote...

Embodiment 2

[0059] Such as figure 2 As shown, the detection method for lithium ion battery analysis provided by the second embodiment of the present invention is based on the technical solution provided by the first embodiment, the step S101 "charging the lithium ion battery is tested, and the charging test process is collected Further optimization of the voltage and capacity data of lithium-ion batteries". Explanations of terms that are the same as or corresponding to the above embodiments are not repeated here. Specifically, the following steps may be included:

[0060] The lithium-ion battery is charged under different test magnification tests;

[0061] Fully charge the lithium-ion battery to the cut-off voltage according to the test rate;

[0062] Charge the lithium-ion battery to 0.05C at a constant voltage;

[0063] Collect the voltage and capacity data of the Li-ion battery during the charging test.

[0064] Based on the above optimization, such as figure 2 As shown, the de...

Embodiment 3

[0074] Such as image 3 As shown, the detection method for lithium ion battery analysis provided by the third embodiment of the present invention is based on the technical solution provided by the second embodiment, for step S204 "collecting the voltage and capacity data of the lithium ion battery during the charging test" further optimization. Explanations of terms that are the same as or corresponding to the above embodiments are not repeated here. Specifically, the following steps may be included:

[0075] According to the preset collection interval time, the voltage and capacity data of the lithium-ion battery during the charging test are collected; wherein, the preset collection interval time is less than or equal to 10s.

[0076] Based on the above optimization, such as image 3 As shown, the detection method for lithium ion battery analysis provided in this embodiment may include the following steps:

[0077] S301. Perform charging tests on the lithium-ion battery a...

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Abstract

The embodiment of the invention discloses a method and system for detecting lithium metal separation of a lithium ion battery. The method comprises: charging testing is carried out on a lithium ion battery and voltage and capacity data of the lithium ion battery during the charging testing are collected; differential processing is carried out on the voltage and capacity data to obtain a dV / dQ curve; and according to the dV / dQ curve, the lithium metal separation state inside the lithium ion battery is determined. According to the invention, the data are processed and analyzed and thus the negative lithium metal separation of the lithium ion battery is detected accurately, so that a detection error caused by the human subjectivity is avoided and the influence on safety of the battery by thenegative lithium metal separation is eliminated and thus the service life and the safety of the lithium ion battery are improved. Moreover, the method and system are operated simply, conveniently, andefficiently; and the detection precision is high.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of lithium-ion batteries, and in particular, to a detection method and system for lithium analysis of lithium-ion batteries. Background technique [0002] Lithium-ion batteries, as a new type of green energy, 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 and more stringent. Following that, the lithium-ion battery industry must Solve 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, which w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 李恺闫艳红张钊熊星权
Owner JIANGSU TAFEL NEW ENERGY TECH CO LTD
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