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Nondestructive detection method for lithium separation of lithium ion battery and application method of detection method

A lithium-ion battery, non-destructive testing technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of low detection efficiency, long time, and long time for sealing, and achieve accurate test results and detection methods Simple and easy, the effect of simple and easy method

Pending Publication Date: 2019-04-19
SHENZHEN BAK POWER BATTERY CO LTD
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  • Abstract
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Problems solved by technology

The principle of this method is relatively simple, but the sealing time is long, the detection process takes a long time, and the detection efficiency is low

Method used

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  • Nondestructive detection method for lithium separation of lithium ion battery and application method of detection method
  • Nondestructive detection method for lithium separation of lithium ion battery and application method of detection method
  • Nondestructive detection method for lithium separation of lithium ion battery and application method of detection method

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Embodiment Construction

[0044] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0045] The lithium-ion battery to be tested in this embodiment is a 2.15Ah-18650 lithium-ion battery after screening.

[0046] The use process of the lithium-ion battery to be tested can be simplified as the continuous repetition of charging, standing, and discharging. The relationship between voltage and time during use is shown in the attached figure 1 shown. The precipitation of metallic lithium occurs during battery charging during use. In this embodiment, the charging process of the lithium-ion battery to be tested is taken as the research object.

[0047] The relationship between the current and time during the constant voltage charging process of the lithium-ion battery to be tested is shown in the attached figure 2 shown. Constant voltage charging is a depolarization process. The internal polarization of the battery gradually decreases, t...

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Abstract

The invention discloses a nondestructive detection method for lithium separation of a lithium ion battery. The detection method comprises the following steps of a charging process of a to-be-detectedbattery, an electrochemistry stimulation process of the to-be-detected battery and an analyzing process of the to-be-detected battery. In the electrochemistry stimulation process, according to conditions that alternating-current impedance of the lithium ion battery changes with time, whether or not the lithium separation phenomenon occurs in the battery is judged, and when the phenomenon that thealternating-current impedance is subjected to phase step with time occurs, it can be seen that in the charging process, the to-be-detected lithium ion battery is subjected to lithium separation. The detection method belongs to nondestructive detection and can quickly acquire experiment parameters and accurately reflect the lithium separation conditions in the battery. The detection method is suitable for judging charging conditions of the lithium ion battery, determining charging parameters of the maximum charging current, the maximum charging voltage and the like, and determining the parameter range of external conditions of temperature and the like in the charging process under the circumstance that the lithium separation phenomenon does not occur. On the premise of not influencing performance of the battery, quick charging for the battery is completed through the determined charging parameters.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery testing, and in particular relates to a non-destructive testing method for lithium-ion battery analysis and an application method thereof. Background technique [0002] New energy technology is a contemporary high-tech. As an important part of the new energy field, the lithium-ion battery industry has attracted attention from all walks of life, and it is also in a period of rapid development of the industry; The ever-increasing market has put forward higher requirements for its cost, energy density, rate performance, high and low temperature performance, cycle performance, and safety performance. [0003] At present, the method to increase the energy density of single cells in the industry is mainly through the use of high-nickel positive electrode materials combined with graphite mixed with silicon-based negative electrode materials to achieve the purpose of increasing the energy density of sin...

Claims

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Application Information

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IPC IPC(8): G01R31/389G01R31/378
Inventor 曹志颖高红李维张青勇夏进阳王会锋陈辉宋华杰
Owner SHENZHEN BAK POWER BATTERY CO LTD
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