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Method for quickly detecting consistency of batteries through AC impedance test

An AC impedance and consistency technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., to achieve the effects of saving labor costs, high efficiency, and improving reliability

Inactive Publication Date: 2019-01-04
南京卡耐新能源技术发展有限公司 +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the large-scale application of lithium-ion batteries in new energy vehicles and smart grids is increasing year by year, but the inconsistency of battery parameters is the key factor affecting the service life of battery packs, although the improvement of thermal management level guarantees to some extent The safe operation of the battery pack is still an important technical factor for the large-scale use of lithium batteries to improve the consistency level of the battery

Method used

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  • Method for quickly detecting consistency of batteries through AC impedance test

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Example 1 (see figure 1 )

[0072] (1) Choose ten Panasonic 3.4Ah 18650BF cylindrical batteries with nickel-cobalt-aluminum NCA / artificial graphite MAGE, and conduct parallel sample tests. Use a charge-discharge test cabinet for charge and discharge. First, discharge the battery at a constant current under a certain current. (Except for freshly assembled button batteries), use voltage as the cut-off condition; then adjust the ambient temperature of the battery charge and discharge test. The battery will be charged with a constant current and constant voltage at a rate of 0.05C. When the voltage or capacity is reached Set the deadline for a limited time, and then let it stand for a period of time;

[0073] (2) Test the AC impedance of the battery that reaches the specified voltage or capacity: first adjust the ambient temperature of the test, and then match the appropriate battery load device according to the battery model, state, and system, and then use the electrochemical ...

Embodiment 2

[0081] The difference between Example 2 and Example 1 is that in addition to the technical solution described in Example 1, the consistency of the battery under severe working conditions is discussed, and the environment for the charge and discharge test is set to -40°C, -20°C , 45°C and 85°C, so that the battery consistency at high and low temperatures can be discussed.

Embodiment 3

[0083] The difference between Example 3 and Example 1 is that in addition to the technical solutions described in Example 1, the HPPC DC internal resistance test method is discussed to increase or decrease the continuous discharge time and different discharge rates, such as changing the high-rate continuous discharge time For 20s or 5s, the discharge current is changed to 5C, 8C, etc.

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Abstract

The invention discloses a method for quickly detecting the consistency of batteries through an AC impedance test, and the method comprises the following steps: (1), preparing ten or more batteries ofthe same type and same brand, and performing the parallel sample testing; (2), performing the AC impedance testing of the batteries which reach the specified voltage or capacity; (3), testing the DC internal resistance of the batteries through a DC discharge testing method; (4), finally performing the data processing according to the parallel sample data collection of the AC impedance of the batteries and the size calculation of the DC internal resistance, analyzing a coincidence pattern of Nyquist graphs, and performing the comprehensive evaluation of the consistency of the batteries. The method can obtain ohmic internal resistance, charge transfer internal resistance and diffusion internal resistance through the AC impedance test, wherein the ohmic internal resistance comprises the internal resistance of an electrode piece and made resistance caused by the technology. Through the comparison of the above internal resistance conditions, the method can obtain the statistical data of consistency for reference.

Description

Technical field [0001] The invention relates to the field of battery measurement, in particular to a method for quickly detecting battery consistency through an AC impedance test. Background technique [0002] Li-ion batteries are currently being used in large-scale applications such as new energy vehicles and smart grids year by year, but the current inconsistency of battery parameters is a key factor affecting the service life of battery packs, although the improvement of thermal management level guarantees to some extent The safe operation of battery packs is still an important technical influencing factor for the large-scale use of lithium batteries for improving battery consistency. Not only in new energy vehicles and energy storage systems, the consistency of other 3C products and single cells is also very important. The consistency of data is of great significance for analyzing problems, improving experiments, and improving products. [0003] Consistency is one of the manif...

Claims

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Application Information

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IPC IPC(8): G01R31/389
Inventor 黄海军张海林张勍计结胜张磊白培锋
Owner 南京卡耐新能源技术发展有限公司
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