Battery Management Systems
( 電池管理システム )
2023年3月22 - 23日
PLENARY KEYNOTE PROGRAM
If a Lithium-ion Cell Can Operate for More Than 6 Months at 85°C How Long Can It Last at Ambient Temperature?
In a few of our recent papers, we have presented Li-ion cell designs with liquid electrolytes that give astounding lifetime at temperatures as high as 85°C. In fact, we have been testing these cells now at 100°C and they are operating well for more than one month so far. I will discuss what is required to make such awesome cells and then consider what their lifetime at ambient temperature might be. I will show that the energy density of these cells is very reasonable and that Co-free moderate-nickel designs also work equally well.
Next-Generation Batteries - An Update on Li Metal Battery and All Solid-State Battery
With the recent success in deploying lithium-ion batteries for light-duty passenger cars, it is time for researchers and scientists to work on a road map of next-generation batteries beyond lithium-ion. In this talk, I will give an update on the current status of research efforts in enabling lithium metal batteries and all solid-state batteries. A few cutting-edge scientific tools will be introduced, including X-ray CT, Cryo-EM, Titration GC, and more, all aimed at quantitative understanding of the failure mechanisms of next-gen batteries.
Refreshment Break in the Exhibit Hall with Poster Viewing4:00 pm
MODEL-BASED BATTERY MANAGEMENT SYSTEMS
Victoria Mosolgo, Conference Producer, Cambridge EnerTech
Triggering and Controlling of Thermal Runaway of Commercial Lithium-ion Batteries: Where Is the Point of No Return for a Battery Fire?
Safety tests by means of Accelerating Rate Calorimetry (ARC) have been conducted on cylindrical type 21700 cells with NCA and LFP chemistry. The temperature where thermal runaway is stoppable was found, as well as when the chain reaction can't be stopped anymore. Two modified heat-wait-seek (HWS) experiments have been conducted, one with intensive cooling of the cell and the other with environmental heat dissipation without active cooling.
Extreme Battery Testing
An NMC 811 21700 cell module is subjected to immersion cooling during fast charging and nail penetration testing. The results are compared to baseline without immersion cooling and benefits and shortcomings are analyzed.
Battery cyclers play an important role throughout the entire battery production process, especially for battery management system design. Will introduce Bitrode Digital CyclerTM (BTDCTM), the next generation of battery cyclers designed and developed based on feedback key players in the industry. We will introduce some of the unique features of this product to demonstrate how it goes beyond a simple cycler and can streamline various aspects of battery management system design.
Close of Day6:10 pm
Registration and Morning Coffee & Pastries7:25 am
Breakfast Opener - Sponsorship Opportunity Available8:00 am
Presentation to be Announced8:30 am
Safety of Micro-USB Lithium-ion Batteries under Nominal and Off-Nominal Conditions
Micro-USB Li-ion batteries (LIBs) are the latest devices in the market where lithium-ion batteries come fitted with a micro-USB port for direct charging through any USB power supply. The micro-USB batteries are fitted with a circuit board that is expected to not only provide the charge protocol but also expected to be independently fault-tolerant to all electrical off-nominal conditions. The nominal and off-nominal characteristics of micro-USB batteries from six manufacturers were studied. The results of these studies will be presented.
Challenges in battery manufacturing reliability have caused speed bumps in the shift to e-mobility and billion-dollar setbacks for automakers and battery manufacturers. EchoStat®, Liminal’s in-line cell inspection platform, enables data-driven improvements to cell safety and increases production capacity while decreasing operational costs. This presentation will describe real-world, commercial case studies of EchoStat, and how ultrasound and ML-based inspection during production detects defects, predicts performance, and accelerates quality analysis.
Coffee Break in the Exhibit Hall with Poster Viewing10:00 am
NEXT-GENERATION BATTERY MANAGEMENT SYSTEMS
Next-Generation Intelligent Battery Management System with Enhanced Safety for Transportation Electrification
With the increasing incidence of fire and catastrophic failure of electric vehicles, the necessity of an advanced battery management system and safety framework became crucial. The talk will focus on the importance of intelligent state estimation and control in lithium-ion battery management systems for transportation electrification applications. The current issues and challenges will be also discussed to highlight the scope of future research and development.
Considerations, Methods, and Tools for Advanced Battery Management System Algorithms to Improve Safety
The Battery Management System (BMS) has the crucial task of keeping a high-voltage battery pack safe. BMS relies on measured data from battery packs at different levels through different sensors. Capturing relevant data with proper interpretation is crucial for correct diagnosis. In this presentation, we will discuss the unreliability issues of battery safety and its diagnosis for different emerging sensors. We will present a diagnostic evaluation tool for uniformly testing and validating the battery safety-specific sensors, which could accelerate their implementation in advanced BMS.
Matlab/Simulink Model for Monitoring Cell State-of-Health and State-of-Charge via Impedance of Lithium-ion Battery Cells
This study introduces an electrical equivalent circuit model of lithium-ion cells developed in the MATLAB/Simulink environment. Cell SoC, SoH, temperature, and C-rate are considered for more accurate cell impedance prediction, and the simulation results are verified with the measurement results. The developed model is suitable for use in cell SoC and SoH monitoring studies by successfully outputting cell impedance through real-time prediction of cell voltage during discharge.
Enjoy Lunch on Your Own12:15 pm
Dessert Break in the Exhibit Hall - Last Chance for Poster Viewing1:05 pm
Fast Charging of Lithium-ion Batteries at All Temperatures
Range anxiety is a key reason that consumers are reluctant to embrace electric vehicles (EVs). However, none of today’s EVs allow fast charging in cold or even cool temperatures due to the risk of lithium plating, the formation of metallic lithium that drastically reduces battery life and even results in safety hazards. Here, we present an approach that enables 15-minute fast charging of Li-ion batteries at any temperature (-50 °C).
Wave Technology for Fast Charging Li-ion Batteries
A battery cell in which a liquid electrolyte is disposed and an acoustic transducer in mechanical communication with the battery cell. The acoustic transducer is configured to generate acoustic waves. The acoustic waves have a wavelength larger than a dimension of the battery cell such that the acoustic waves generate cavitation bubbles in the electrolyte.
Ionblox has developed large format pouch cells using pre-lithiated silicon monoxide anode that simultaneously delivers high specific energy, fast charge, high-power, and long cycle life. Our patented pre-lithiated silicon anode has cycled over 1500 DST cycles in large format pouch cells following USABC test protocols. Pouch cells exhibit 90% capacity recovery under the standard 15-minute charge test and over 1000 cycles at fast charge conditions of 4C charge and 1C discharge.
Overcharging - Fast Charging
A novel parametrisation testing technique is presented. It's then parametrised using this testing technique and compared to a model parametrised using current common testing techniques. This comparison is conducted using a WLTP (worldwide harmonised light vehicle test procedure) drive cycle. As part of the validation, the experiments were conducted at different temperatures and repeated using two different temperature control methods: a climate chamber and a Peltier element temperature control method.
ADVANCED BATTERY MANAGEMENT SYSTEMS
Calibrating Electrode Open-Circuit-Potential Relationships via Nondestructive Full-Cell Discharge Tests
Physics-based battery-cell models used by advanced BMS depend on knowledge of the electrodes’ OCP relationships as functions of stoichiometry. The utility of these relationships depends on how accurately they correspond to the true local absolute stoichiometry. This talk proposes a nondestructive lab test and corresponding data-processing method that can calibrate an initial relative OCP-function estimate to produce an absolute OCP-function estimate that increases the accuracy of the cell model.
State-of-Power Estimation for Lithium-ion Batteries: A Brief Tutorial
State-of-the-art BMS rely on highly accurate battery models and powerful algorithms to obtain useful estimates of available power for safe battery operation. This talk presents - in tutorial fashion - an overview of state-of-power (SOP) estimation for lithium-ion batteries. Depicted graphically in the context of the voltage-current product, the talk explains the various definitions of SOP and the variety of model-algorithm approaches used in its calculation. Examples are demonstrated via simulation.
Close of Conference4:35 pm