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Experimental study on thermal runaway of fully charged and overcharged lithium-ion batteries under adiabatic and side-heating test

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JOURNAL OF ENERGY STORAGE 2021年 38卷

作者： Zhao, Chunpeng Wang, Tinghua Huang, Zheng Wu, Jingyun Zhou, Hongwei Ma, Mina Xu, Jiajia Wang, Zhaoyu Li, Huang Sun, Jinhua Wang, Qingsong Univ Sci & Technol China State Key Lab Fire Sci Hefei 230026 Peoples R China State Grid Jiangsu Elect Power Design Consulting Nanjing 210008 Peoples R China State Grid Jiangsu Elect Power Co Ltd Econ Res Inst Nanjing 210008 Peoples R China

In this work, the thermal runaway (TR) hazards of a 4.5 Ah 21,700 cylindrical lithium-ion battery (LIB) are investigated at 100%, 110% and 120% stage of charge (SOC). The TR behavior of the sample at elevated temperature is characterized using an extended volume accelerating rate calorimetry and a customized battery test canister. The results show that the time interval from the LIB voltage drop to the initial of TR increases with the increase of SOC. The time interval for the LIB with 120% SOC is significantly greater than 100% and 110% SOCs, which is meaningful for the early warning of TR. In adiabatic or side-heating test, the initial temperature of TR of LIBs at different SOCs is almost the same, but the temperature at voltage drop shows a downward trend as the adding SOC. The separator thermal stability of slightly overcharged LIB is lower than fully charged LIB according to the SEM and DSC tests. Besides, the TR hazards of the LIB are recommended to be determined by multiple factors, including pressure, ambient temperature and battery surface temperature.

关键词： Lithium-ion battery safety Thermal runaway hazards Overcharge Pressure

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A method of verifying the secure communication between edge device and end device in power internet of things

A method of verifying the secure communication between edge ...

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IEEE International Conference on Civil Aviation Safety and Information Technology (ICCASIT)

作者： Bin Zhou Qingqin Fu Jia Liu Zhaoqing Liang Shengbo Qu Key Lab of Power Grid Design and Analysis State Grid Corporation of China Beijing Chip Microelectronics Technology Co.Ltd Beijing China

ISBN: (数字)9781728199481

ISBN: (纸本)9781728199498

This paper analyzes the deficiency of traditional testing method of secure communication between edge device (The device does edge computing in internet of things) and end device (The device in the end of internet of things) in power internet, and proposes a verifying method in power internet of things. This method applies to the scene that tremendous amount of end devices plugged in power internet of things and communicate securely with edge devices. Comparing to traditional method, this method is capable to verify if the security and efficiency of the communication between edge device and end device so that they can meet the requirements in power internet of things.

关键词： power industry Safety Internet of Things Security Information technology Testing Edge computing

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design and implementation of high speed encryption and decryption system based on PCIE bus

Design and implementation of high speed encryption and decry...

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IEEE International Conference on Civil Aviation Safety and Information Technology (ICCASIT)

作者： Yi Tao Qingqin Fu Jia Liu Yongxu Cui Zhaoqing Liang Rui Nie Shengbo Qu Key Lab of Power Grid Design and Analysis State Grid Corporation of China Beijing Chip Microelectronics Technology Co.Ltd Beijing China

ISBN: (数字)9781728199481

ISBN: (纸本)9781728199498

In order to adapt to the development of science and technology and the needs of society, cryptosystem is also developing towards high speed and high reliability. This paper adopts PCI-Express BUS to replace the traditional PCI BUS, because PCIE is a serial bus in the form of point-to-point, the scheme can avoid the timing out of sync problem when PCI Bus transmits data, the scheme can solve the problem of high-speed data transmission between FPGA and PC. This paper introduces the design of DMA asynchronous transmission scheme based on PCIE bus, and the effectiveness of this scheme is proved by the verification.

关键词： Encryption Safety Synchronization Reliability Data communication Information technology Field programmable gate arrays

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A non-pipelined ADC with a GM-R amplifier

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MICROELECTRONICS JOURNAL 2023年 137卷

作者： Hu, Weibo Yan, Xiang Cui, Haitao Feng, Jingbin Hu, Yi Hou, Jiali Li, Zhenguo Lu, Chao Xiao, Zhiming Ma, Wei Nankai Univ Inst Photo Elect Thin Film Devices & Technol Tianjin Peoples R China Beijing Smart Chip Microelect Technol Co Ltd State Grid Key Lab Power Ind Chip Design & Anal Te Beijing Peoples R China Southern Illinois Univ Sch Elect Comp & Biomed Engn Carbondale IL 62901 USA Nankai Univ Lab Integrated Circuits & Smart Syst Shenzhen Grad Sch Shenzhen Peoples R China

A GM-R amplifier is proposed as a residual amplifier to implement a 16-bit two-stage non-pipelined ADC in intermittent signal acquisition applications. Unlike common capacitive feedback amplifiers, residual amplifiers utilize resistor ratios to generate constant gain for small input amplitude ranges and wide temperature ranges. The input circuit of the proposed amplifier consists of two source followers and a bridge resistor, thus converting residual voltages to currents, and the transconductance is the reciprocal of the bridge resistor. The amplifier offset voltage is corrected by a one-time foreground offset calibration, and the gain error is calibrated with the capacitor weights in the first stage. Redundancy is adopted between the two stages to accommodate the residual offset voltage after calibrating the offset voltage of a comparator and the gain variation. A design prototype is implemented in 180 nm CMOS technology, occupies a 0.69 mm2 footprint, and consumes 3.0 mW from 1.8/5 V power supplies. After calibration, it achieves the SNR of 88.2 dB, SNDR of 87.6 dB, and THD of -95.6 dB at 200 kHz sampling rate. The measured differential nonlinearity (DNL) and integral nonlinearity (INL) are -0.62/ +0.74 LSB and -1.39/+1.50 LSB, respectively.

关键词： High resolution Offset calibration Residue amplifier SAR ADC

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Fault Detection of Wind Turbine Pitch System Based on Multiclass Optimal Margin Distribution Machine

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MATHEMATICAL PROBLEMS IN ENGINEERING 2020年第1期2020卷

作者： Tang, Mingzhu Kuang, Zijie Zhao, Qi Wu, Huawei Yang, Xu Changsha Univ Sci & Technol Sch Energy & Power Engn Changsha 410114 Peoples R China Hubei Univ Arts & Sci Hubei Key Lab Power Syst Design & Test Elect Vehi Xiangyang 441053 Peoples R China State Grid Beijing Integrated Energy Serv Co Ltd Beijing 100176 Peoples R China

In response to the unbalanced sample categories and complex sample distribution of the operating data of the pitch system of the wind turbine generator system, this paper proposes a method for fault detection of the pitch system of the wind turbine generator system based on the multiclass optimal margin distribution machine. In this method, the power output of the wind turbine generator system is used as the main status parameter, and the operating data history of the wind turbine generator system in the wind power supervisory control and data acquisition (SCADA) system is subject to correlation analysis with the Pearson correlation coefficient, to eliminate the features that have low correlation with the power output status parameter. Secondary analysis is performed to the remaining features, thus reducing the number and complexity of samples. Datasets are divided into the training set for training of the multiclass optimal margin distribution machine fault detection model and test set for testing. Experimental verification was carried out with the operating data of one wind farm in China. Experimental results show that, compared with other support vector machines, the proposed method has higher fault detection accuracy and precision and lower false-negative rate and false-positive rate.

关键词： Fault detection

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Effective strengthening and toughening in high entropy-alloy by combining extrusion machining and heat treatment

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SCRIPTA MATERIALIA 2022年第0期213卷 114630-114630页

作者： Pu, Zhuo Cai, Song -Lin Dai, Lan-Hong Nucl Power Inst China Sci & Technol Reactor Syst Design Technol Lab Chengdu 610200 Peoples R China Beijing Inst Technol State Key Lab Explos Sci & Technol Beijing 100081 Peoples R China Chinese Acad Sci Inst Mech State Key Lab Nonlinear Mech Beijing 100190 Peoples R China Univ Chinese Acad Sci Sch Engn Sci Beijing 100049 Peoples R China State Grid Corp China China Elect Power Res Inst Beijing 100192 Peoples R China

This study presents an effective strengthening and toughening approach to improve tensile properties of CrMnFeCoNi high entropy-alloy (HEA) by combining extrusion machining and short-time heat treatment. After such process, preliminary structural heterogeneity has been achieved in this alloy, of which the strength is significantly enhanced while good elongation is retained compared to its homogeneous conterparts. Microstructural characterization reveals varying degrees of partial recrystallization with more or less dislocation density for HEAs under different treatment. It is such structural inhomogeneity that imparts this alloy with good strain hardening ability at high flow stress levels.

关键词： High-entropy alloy Extrusion machining Heat treatment Strain hardening Recrystallization

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Technology Research on the Application of High Safety Anti-Metal RFID Tags in the Asset Management of power Equipment

Technology Research on the Application of High Safety Anti-M...

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2019 International Conference on Artificial Intelligence and Advanced Manufacturing, AIAM 2019

作者： Liu, Jia Fu, Qingqin Yuan, Yubo Fu, Jianfeng Beijing Chip Microelectronics Technology Co. Ltd. Key Lab of Power Grid Design and Analysis State Grid Corporation of China Beijing China

ISBN: (纸本)9781728146911

The power equipment assets has the characteristics of large initial investment, high operation cost, long service time. Therefore it is the basic requirement to carry out the electrical equipment life cycle management to ensure the grid assets safety running. Using security Ultra High Frequency (UHF) Radio Frequency Identification (RFID) anti metal tag as the equipment asset identification, it is useful to ensure the legitimacy of reader and tag, and the security of data storage and transmission, and the personnel authority access control. In this paper, the characteristics, working principle and working flow of high security RFID electronic tags are designed and studied. The typical solution is provided for the intelligent management of grid assets. © 2019 IEEE.

关键词： Access control

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A Blockchain-based Protocol for power Data Preservation in Ping Dingshan vs. Wang Case

A Blockchain-based Protocol for Power Data Preservation in P...

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IEEE International Conference on Electronics and Communication Engineering (ICECE)

作者： Huinan Wang Yang Feng Bin Xing Xin Zhang Zhao Wang Jiaxing Wu Xin Huang Metering Center of Shanxi Electric Power Company China State Grid Key Laboratory of Power Industrial Chip Design and Analysis Technology Smart-Chip Microelectronics Technology Co. Ltd. China Taiyuan University of Technology China

ISBN: (纸本)9781728188577

power companies, the data collected by smart meters on electricity consumption is of vital interest. In 2019, Wang had a dispute with Ping Dingshan. They came into disagreement regarding the amount of electricity consumed, which was a difference of 1334 kWh. It was not settled until 2021. To avoid the above problem, smart meters could upload power information to the blockchain. In this paper, we improved the authentication protocol key proposed by Zhang and proposed a new scheme for uploading the power information from smart electricity meters, which ensures the integrity, confidentiality and authentication of the power information. At the same time, the proposed scheme is unbalanced for the computing capability of both communication parties, and can effectively reduce the burden of the server.

关键词： Meters Protocols Conferences Authentication Companies Smart meters Real-time systems

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A New Type of key Agreement Mechanism between Electric Meters and Extended Modules

A New Type of Key Agreement Mechanism between Electric Meter...

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IEEE International Conference of Safety Produce Informatization (IICSPI)

作者： Liang Zhaoqing Wang Zhiqiang Fu Qingqin Liu Jia Qu Shengbo Zhou Jing Zhao Shijie Beijing Smartchip Microelectronics Technology Co. Ltd. Key Lab of Power Grid Design and Analysis State Grid Corporation of China Beijing China

ISBN: (数字)9781728177380

ISBN: (纸本)9781728177397

This paper analyzes the defects of key agreement mechanism between traditional electricity meters and extended modules, and proposes a new type of key agreement mechanism between them. By adding the serial number of extended modules in the command of session key agreement, this approach helps to distinguish which extended module has achieved communication and realizes the purpose of communicating with several extended modules. In addition, this paper comes up with a white list verification method. Each time when conducting the key agreement, it is necessary to judge whether the input scattering factor is included in the white list. If not, it will cease to conduct the session key agreement operation.

关键词： Meters Conferences Scattering Authentication Production Sorting

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An instruction based automatic workflow testing method for security chip 2

An instruction based automatic workflow testing method for s...

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2nd IEEE International Conference on Automation, Electronics and Electrical Engineering, AUTEEE 2019

作者： Zhou, Jing Fu, Qingqin Liu, Jia Wang, Rui Bai, Xuesong Beijing Chip Microelectronics Technology Co. Ltd. Key Lab of Power Grid Design and Analysis State Grid Corporation of China Beijing China

ISBN: (纸本)9781728150291

This paper analyzes the faults of traditional workflow testing of security chip, and proposes a new automatic workflow testing for security chip. This method is based on instruction processing and encapsulates 645 protocol, to simulate the workflow of main station, security chip and electric energy meter. Comparing to traditional method, it overcomes the disadvantages that traditional workflow has no interactive testing with real energy meter which may lead to faults when testing on the real energy meter. Meanwhile, it advances the schedule of the smoke test and realizes the workflow modularization, greatly improves the efficiency of the workflow test and regression test. © 2019 IEEE.

关键词： Smoke

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