Xueyuan Wang

Tongji University · School of Automotive Studies

State of health diagnosis and estimation of lithium-ion batteries is a key feature of an advanced battery management system. Electrochemical impedance spectroscopy is frequently used for the state of health diagnosis and estimation. In the paper, the charge transfer resistance of the battery is obtained by fitting the impedance spectroscopy with an...

Temperature affects lithium-ion battery performance, health and safety. Therefore, obtaining temperature is quite necessary for battery management system. Impedance is widely adopted and proved to be feasible to estimate temperature. In the paper, wavelet transform is applied to process the step current and the response voltage of the battery cell...

Alternating current (AC) impedance spectra facilitate lithium-ion battery management. Realizing a low-cost and low-complexity on-board impedance measuring system is a vital issue for the management based on the AC impedance. In the paper, a novel impedance measuring system combined with a high-power dual active bridge (DAB) converter and distribute...

Impedance is closely related to the internal physical and chemical processes of lithium-ion batteries. And the properties of the processes can be characterized and thus more detailed information be provided based on it. In the past decades, the impedance is frequently reported as a powerful tool used in the field of lithium-ion battery state estima...

Electrochemical impedance spectroscopy (EIS) is one of the most powerful tools for battery sorting, state estimation, and diagnosis. To obtain EIS, a conventional and time-consuming sweeping sine method is commonly used in a laboratory depending on professional equipment, which is limited for practical applications. For the first time, this paper p...

Advanced sensors based on electrochemical impedance spectroscopy (EIS) are essential for fuel cell system state estimation, fault diagnosis, and health management. However, traditional EIS methods are unsuitable for real-time state management due to high costs, large sizes, and long acquisition times, limiting their online industrial application. T...

Lithium plating may occur during charging, especially at high rates or overcharging conditions for lithium-ion batteries (LIBs), which would cause battery capacity degradation and even trigger thermal runaway. Thus, it is essential to detect lithium plating onset during the charging processes. Electrochemical impedance can reveal the dynamic electr...

Lithium plating during the fast charging process significantly decreases the health and safety of lithium-ion batteries (LIBs). Hence, detecting the onset of lithium plating is essential to realize the highly effective and low-damage fast charging. However, an online lithium plating onset detection method that can be used in constant current (CC) a...

Low temperatures seriously affect the performance of lithium-ion batteries. This study proposes a non-destructive low-temperature bidirectional pulse current (BPC) heating method. Different from existing heating approaches, this method not only optimizes heating frequency and amplitude but also considers the optimization of the charge/discharge pul...

The electrification of transportation is experiencing rapid development. Electric bicycles (e-bikes) are commonly employed as convenient modes of transportation. Thanks to the advantages of long life and high energy density, lithium-ion batteries (LIBs) are widely used in e-bikes. In certain business models, e-bikes can utilize rental LIBs, which a...

This paper proposes a novel framework for low-temperature fast charging of lithium-ion batteries (LIBs) without lithium plating. The framework includes three key components: modeling, constraints, and strategy design. In the modeling phase, a new electro-thermal coupled model is introduced, which integrates both frequency-domain and time-domain ele...

Capacity is a crucial metric for evaluating the degradation of lithium-ion batteries (LIBs), playing a vital role in their management and application throughout their lifespan. Various methods for capacity estimation have been developed, including the traditional Ampere-hour integral method, model-driven methods based on equivalent circuit models o...

The degradation of low-temperature cycle performance in lithium-ion batteries impacts the utilization of electric vehicles and energy storage systems in cold environments. To investigate the aging mechanism of battery cycle performance in low temperatures, this paper conducts aging experiments throughout the whole life cycle at −10 ℃ for lithium-io...

Most mechanism-based battery models rely on the pseudo-two-dimensional (P2D) model, which simplifies electrode particles as homogenously distributed spheres, lacking the capability to represent the intricate microstructure. To develop a modeling approach aligned with authentic electrode microstructure, a mesoscopic image dataset of a NCM523 cathode...

The poor low-temperature performance of lithium-ion batteries (LIBs) significantly impedes the widespread adoption of electric vehicles (EVs) and energy storage systems (ESSs) in cold regions. In this paper, a non-destructive bidirectional pulse current (BPC) heating framework considering different BPC parameters is proposed. To determine the lithi...

Lithium plating occurring on anodes of lithium-ion batteries severely restricts fast-charging capability and brings significant degradation when low-temperature charging. Although strict control of lithium plating provides the possibility for undamaged charging, it seriously limits the charging speed. To explore a desirable trade-off between chargi...

Electrochemical impedance spectroscopy (EIS) establishes the relationship with the internal electrode processes of the battery through the impedance of different frequencies. The EIS measurement of general impedance measurement equipment often used in the laboratory takes a long time and cannot meet the needs of practical application. This paper co...

Thermal runaway propagation (TRP) is the most challenging safety issue of lithium-ion battery systems. An early warning signal is promising for providing time to mitigate or prevent TRP and further disasters timely. This study investigates the strain characteristics of different format prismatic batteries during the TR/TRP processes, dividing the s...

Inconsistency of current density distribution in‐plane in fuel cells is a common phenomenon. This study develops a novel highly‐integrated sensor with the feature of signal in‐situ amplification for measuring in‐plane current density. First, the sensor is designed and fabricated based on the idea of in‐situ amplification of in‐plane signals before...

本书结合作者十余年科学研究和实践，以新能源汽车用锂离子电池为 对象，系统阐述了动力电池电化学阻抗技术原理、模型描述、获取方法、 测量系统及其在锂离子电池状态估计、预测和诊断中的应用研究。本书面 向电池管理技术领域，突破电化学阻抗技术的实验室应用局限性，可用于 指导电化学阻抗技术的工程应用和实践。 本书可作为化学电源管理与控制(特别是电池管理)相关领域的工程技 术人员、科研人员、研究生的参考用书，也可作为高等院校学生的专业课教 科书。

Bidirectional pulsed current (BPC) heating has proven to be an effective method for internal heating. However, current research has primarily focused on the impact of symmetrical BPC on battery heat generation, while neglecting the influence of different BPC parameters. To address this gap, this paper investigates the effects of various BPC paramet...

Research on the impact of high-temperature aging on the thermal safety of lithium-ion batteries, Journal of Energy Chemistry (2023), doi: https://doi. Abstract: Understanding the thermal safety evolution of lithium-ion batteries during high-temperature usage conditions bears significant implications for enhancing the safety management of aging batt...

Models play a crucial role in explaining internal processes, estimating states, and managing lithium-ion batteries. Electrochemical models can effectively illustrate the battery’s mechanism; however, their complexity renders them unsuitable for onboard use in electric vehicles. On the other hand, equivalent circuit models (ECMs) utilize a simple se...

汽车电动化、智能化和网联化促进了汽车电子技术变革。本书从汽车电子的学科特点和技术基础出发，介绍了汽车电子硬件、通信和软件架构发展过程和动因，总结了各个阶段的技术特征，并阐述了硬件技术发展的进程；介绍了汽车通信技术的发展过程，重点介绍了CAN、CAN FD、CAN XL以及FlexRay、MOST等传统车载网络技术，以及车载以太网技术及其关键协议；详述了汽车电子基础软件AUTOSAR CP和AUTOSAR AP相关技术及其应用方向；论述了面向服务的软件架构（SOA）的基本概念、发展过程、结构模型等，并对SOA的实现基础、设计流程和市场实践进行了简介；分析了汽车电子V模式开发、敏捷开发的理念和技术特点，重点介绍了OTA升级技术的基本概念、发展过程以及对智能汽车的重要意义。 本书可作为汽车电子与软...

Further applications of electric vehicles (EVs) and energy storage stations are limited because of the thermal sensitivity, volatility, and poor durability of lithium-ion batteries (LIBs), especially given the urgent requirements for all-climate utilization and fast charging. This study comprehensively reviews the thermal characteristics and manage...

The anode recirculation mode is increasingly being adopted in today's fuel cell systems. The recycling of hydrogen gas can effectively improve fuel utilization and the wider economy. However, using the purge strategy for the recirculation exhaust has a significant impact on the operational performance and economic efficiency of fuel cell systems.Ex...

Electrochemical impedance spectroscopy (EIS) establishes the relationship with the internal electrode processes of the battery through the impedance of different frequencies. EIS can be used to estimate and diagnose the internal state of the battery, which has attracted more and more attention. For an on-board application or offline maintenance app...

Increasingly, batteries are being exposed to elevated temperatures to promote charging capability and satisfy various requirements. A comprehension of the degradation mechanism under elevated temperature is essential for advanced battery management. Here, commercial 100 Ah prismatic graphite/LiFePO 4 batteries cycled under 45 • C are investigated....

Irreversible lithium plating, as one of the unwanted side reactions, has a high risk of accelerating degradation to destroy the electrochemical performance of lithium-ion batteries (LIBs). Presently, most of the existing irreversible lithium plating detection methods are qualitative or post-mortem quantitative, and there is still a lack of an effec...

To reveal the impact of alternating current (AC) amplitude on impedance, this study investigates the electrochemical impedance with different AC amplitudes for a lithium-ion battery (NCA vs. graphite) and half cells under different states of charge (SOCs), at room and low temperatures. To determine the relationship of different polarization proce...

Electrochemical impedance spectroscopy (EIS) is frequently reported to be used in mechanism analysis, state estimation, and fault diagnosis of lithium-ion batteries. For a long time, EIS has been measured in the laboratory using carefully designed equipment, which has the problem of long measurement time and is not convenient for field applications...

The cold-start of proton exchange membrane fuel cell (PEMFC) has been one of the leading technical challenges for fuel cell vehicle commercialization. It is essential to understand the mechanism and process of a cold start to improve the cold start ability of the PEM fuel cell. In this study, a one-dimensional cold start transient model of PEMFC wa...

Hydrogen crossover rate is a key parameter for characterizing internal gas leakage in proton exchange membrane fuel cells. Voltammetric and galvanostatic techniques are most commonly used in measuring hydrogen crossover. However, for the present, the existing methods have the drawbacks of being laborious and time-consuming. In this paper, electroch...

Battery state of health (SOH) estimation is a critical but challenging demand in advanced battery management technologies. As an essential parameter, battery impedance contains valuable electrochemical information reflecting battery SOH. This study investigates a systematic comparative study of three categories of features extracted from battery el...

Hydrogen crossover rate has emerged as a key indicator for characterizing the aging process of proton exchange membrane fuel cell. Electrochemical techniques are the most common for quantifying hydrogen crossover. However, for the present, most existing methods are only applicable to the scenario of single fuel cell. There is still a lack of effici...

Alternating current (AC) impedance is an important and promising feature for lithium‐ion battery state estimation and prediction. In this study, a new battery capacity estimation method using AC impedance with Gaussian process regression (GPR) is proposed. A bunch of high‐energy 18650‐type batteries with a nominal capacity of 3.5 Ah are cycled at 2...

The safety of the degraded lithium-ion batteries has an essential impact on second life application. This study systematically investigates the thermal safety changes of lithium-ion batteries after deep aging under the fast charge aging path and reveals the degradation mechanisms caused by fast charge cycling. Lithium plating is the primary degrada...

Lithium-ion batteries (LIBs), as the first choice for green batteries, have been widely used in energy storage, electric vehicles, 3C devices, and other related fields, and will have greater application prospects in the future. However, one of the obstacles hindering the future development of battery technology is how to accurately evaluate and mon...

High-nickel lithium-ion batteries extend the driving mileage of electric vehicles (EVs) to 600km without much cost increment. However, thermal accidents commonly occur due to their poor thermal stability, such as thermal runaway. To address the issue, a comprehensive analysis of the thermal runaway behavior of high-nickel lithium ion batteries with...

Electrochemical impedance spectrum (EIS) applied in fuel cell characterization and diagnosis facilitates its system management in the vehicular application, but the first consideration of impedance-based management is how to obtain impedance online. The traditional laboratory method based on sine sweep is unsuitable for vehicular EIS measurement as...

Lithium-ion batteries (LIBs) with a graphite anode are currently the most popular in electric vehicles. Lithium plating may occur in such LIBs due to an inappropriate charging strategy, worsening safety and cycle life. So far there is still a lack of effective online detection methods for the lithium plating onset. In the paper, the broadband imped...

Investigating and interpreting each internal polarization dynamics that occurs in the polymer electrolyte membrane fuel cell is significant. Traditional equivalent circuit model fitting by nonlinear least-squares relies on prior model assumptions and initial value selection of components. In this paper, the distribution of relaxation times methodol...

Early internal short circuit (ISC) diagnosis is critical for a battery management system (BMS) to prevent the thermal runaway of lithium-ion batteries. However, it is difficult to be diagnosed owing to few obvious electric and thermoelectric characteristics in the early stage of ISC. In this study, a novel ISC diagnosis method based on the incremen...

Fast charging is significant for the driving convenience of an electric vehicle (EV). However, this technology causes lithium (Li)-ion batteries’ massive heat generation under such severe current rates. To ensure the thermal performance and lifespan of a Li-ion battery module under fast charging, an artificial neural network (ANN) regression method...

Electrochemical impedance spectroscopy (EIS) is widely used to diagnose the state of health (SOH) of lithium-ion batteries. One of the essential steps for the diagnosis is to analyze EIS with an equivalent circuit model (ECM) to understand the changes of the internal physical and chemical processes. Due to numerous equivalent circuit elements in th...

An effective online fault diagnosis system is of great significance to improve the reliability of fuel cell vehicles. In this paper, a fault diagnosis model for proton exchange membrane fuel cells is proposed. Firstly, the tests of electrochemical impedance spectroscopy under different fault types (flooding, drying, air starvation) and fault degree...

Lithium-ion batteries (LIBs) are widely used as the energy carrier in our daily life. However, the higher energy density of LIBs results in poor safety performance. Thermal runaway (TR) is the critical problem which hinders the further application of LIBs. Clarifying the mechanism of TR evolution is beneficial to safer cell design and safety manage...

The cover image is based on the Research Article A novel dual time scale life prediction method for lithium‐ion batteries considering effects of temperature and state of charge by Xueyuan Wang et al., https://doi.org/10.1002/er.6746.

In a series module, cells with smaller capacity suffer from hard working conditions, leading to faster aging speed and finally exacerbating the deterioration of cell consistency. However, cells with large capacity in a parallel module bear a large current, thus accelerating the aging speed and automatically balancing the capacity of different cells...

A fast impedance calculation method is proposed to track the broadband impedance online. When charging at a low temperature or with a large current, the battery impedance at certain frequencies decreases. With the identification of the plateau on the relaxation terminal voltage curve, it is considered that the impedance decrease is caused by lithiu...