Online Nonintrusive Identification and Monitoring of Internal Weak Points of Electro Energy Devices Using Package Surface Temperature

电能设备（如电池）在现代社会中发挥着至关重要的作用，其广泛的应用跨越各个部门，如交通，医疗保健，通信和可再生能源发电，仅举几例。目前，评估这些设备的使用寿命是一项极具挑战性的任务。因此，在关键任务和/或情况下，这种设备存在过早失效的巨大风险，从而导致安全问题和经济损失。目前，还没有一种通用的、有效的方法来在线识别各种电能装置的内部弱点，并监测其运行过程中的老化过程和健康状况。该项目制定并演示了新的通用动态建模和系统识别方法，用于利用封装表面温度对电能器件的内部弱点进行低成本在线识别和状态监测。这些方法不会侵入设备或中断其操作。该研究结果将增强实时、预测状态感知，提高对电能器件老化和失效机制的理解，有助于设计更可靠的器件。增强状态意识和设计将大大提高安全性和可靠性，降低使用电能装置的成本和财务风险。该项目将为研究生和本科生提供跨学科的研究培训，并为K-12学校的学生提供STEM教育，重点是能源系统应用的动态系统建模和识别。该项目将创建一个新的动态建模和基于系统识别的通用数学框架，用于利用其热特征对电能设备内部弱点进行非侵入式在线识别和状态监测。该框架结合了一种新的通用解释，通过测量封装表面温度估计器件的三维电热动力学变化来解释内部薄弱点的复杂老化过程。基于这一解释，将开发一种新的数学建模方法，通过高保真度、基于物理的建模、带有可量化误差界限的自动模型降阶、降阶模型的在线参数识别和高阶模型重建，自适应地表征器件的老化相关电热动力学。所确定的参数将包含有关内部薄弱点的位置、老化过程和健康状况的信息，因此可用于电能装置的状态监测。该框架将通过计算机模拟和实验研究来验证，以识别和监测功率半导体器件的内部弱点。除了电能设备外，该研究还将为其他复杂物理系统的建模和诊断提供支持能力。

Electro-energy devices (such as batteries) play an essential role in modern society with their wide spread applications that span various sectors such as transportation, healthcare, communication and renewable energy generation to name a few. Currently, assessing the longevity of such devices while they are in operation is an extremely challenging task. As a result, there exists a huge risk of untimely failure of such devices in critical missions and/or situations leading to safety issues and financial loss. Currently, there are no general, effective approaches to online identification of internal weak points and monitoring of the aging processes and health conditions of different electro-energy devices while in operation. This project formulates and demonstrates new universal dynamic modeling and system identification methodologies for low-cost online identification and condition monitoring of internal weak points of electro energy devices using their package surface temperatures. The methodologies do not intrude upon the devices or interrupt their operation. The results of this research will enhance real-time, predictive condition awareness and improve the understanding of aging and failure mechanisms of electro energy devices, which will help in designing more reliable devices. Enhanced condition awareness and design will greatly improve safety and reliability and reduce the cost and financial risk of using electro energy devices. This project will provide interdisciplinary research training for graduate and undergraduate students and STEM education for K-12 school students focusing on dynamic system modeling and identification for energy systems applications.This project will create a new dynamic modeling and system identification-based universal mathematical framework for nonintrusive online identification and condition monitoring of internal weak points of electro energy devices using their thermal signature. The framework incorporates a new universal interpretation for the complex aging processes of internal weak points via the changes in the three-dimensional electrothermal dynamics of the devices estimated by measuring package surface temperatures. Based on this interpretation, a new mathematical modeling approach will be developed to adaptively characterize the aging-related electrothermal dynamics of the devices via high-fidelity, physics-based modeling, automated model order reduction with quantifiable error bounds, online parameter identification for the reduced-order model, and high-order model reconstruction. The identified parameters will contain information on locations, aging processes, and health conditions of the internal weak points and therefore can be used for condition monitoring of the electro energy devices. The framework will be validated by computer simulation and experimental studies to identify and monitor internal weak points of power semiconductor devices. In addition to electro energy devices, the research will provide enabling capabilities for modeling and diagnostics of other complex physical systems.