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Retired lithium battery screening method based on infrared image hotspot feature clustering analysis

An infrared image and cluster analysis technology, applied in image analysis, material thermal analysis, material analysis, etc., can solve the problems of not fully guaranteeing the consistency of thermal characteristics, increasing the difficulty of thermal management of battery packs, etc., to achieve cascade utilization, The effect of enriching screening methods and reducing difficulty

Pending Publication Date: 2020-11-06
NANJING INST OF TECH
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Problems solved by technology

Only achieving electrical screening cannot fully guarantee the consistency of thermal characteristics, and it is likely to increase the difficulty of subsequent battery pack thermal management

Method used

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  • Retired lithium battery screening method based on infrared image hotspot feature clustering analysis
  • Retired lithium battery screening method based on infrared image hotspot feature clustering analysis
  • Retired lithium battery screening method based on infrared image hotspot feature clustering analysis

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Embodiment Construction

[0051] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0052] A method for screening decommissioned lithium batteries based on cluster analysis of infrared image hotspot features of the present invention, firstly, an active heating method for lithium batteries based on sinusoidal current signals is designed to encourage rapid changes in the surface temperature of decommissioned batteries; on this basis, using infrared Imaging technology records the dynamic change of lithium battery surface temperature during this process; directly processes the video sequence information, takes the temperature change as the step size, extracts the key frame image in the video sequence, and synthesizes it into a single infrared image; uses the threshold method to realize image segmentation, Extract the histogram information features of lithium battery hotspots in the image; through mean shift cluster analysis, filter...

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Abstract

The invention discloses a retired lithium battery screening method based on infrared image hotspot feature clustering analysis. The retired lithium battery screening method comprises steps of heatinglithium batteries and obtaining an infrared video sequence for recording surface temperature changes of the lithium batteries in a heating process; extracting a key frame image in the infrared video sequence; synthesizing the extracted key frame images into a single infrared image; extracting hot spot information of the surface of the lithium battery in the synthesized single infrared image, and calculating a normalized histogram of hot spots on the surface of the battery; and performing clustering analysis by taking the normalized histogram of the hot spots on the surface of the battery as acharacteristic to finish thermal characteristic screening of the retired power lithium battery. According to the method, the normalized histogram of the hot spots on the surface of the battery is extracted from the infrared video sequence, the retired power battery is screened by using a mean shift clustering method, the thermal characteristics of the battery can be actively analyzed and applied,the screening method of the retired power lithium battery is enriched, and difficulty of battery pack thermal management in subsequent echelon utilization is reduced.

Description

technical field [0001] The invention belongs to the technical field of cascaded utilization of decommissioned power lithium batteries, and in particular relates to a screening method for decommissioned lithium batteries based on cluster analysis of infrared image hotspot features. Background technique [0002] With the strong support of the governments of various countries, new energy vehicles are developing rapidly, and it is expected that a large-scale decommissioning of power lithium batteries is coming. Realizing the full life cycle management of lithium batteries is of great significance for improving the new energy vehicle industry chain and forming a green economic model. Generally speaking, power lithium batteries decommissioned from new energy vehicles still have cascade utilization value and can continue to play a role in low-speed vehicles and other applications that require low battery performance. The cascade utilization of decommissioned power lithium batterie...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06K9/62G01N25/00G01R31/36
CPCG06T7/0004G01N25/00G01R31/36G06T2207/10016G06T2207/10048G06T2207/30108G06F18/23Y02W30/84
Inventor 彭纪昌孟锦豪刘海涛蔡磊郝思鹏
Owner NANJING INST OF TECH
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