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Stafl Systems
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Добавлен 22 май 2020
Learn about the latest lithium-ion battery technology from our team of experts. We will discuss how lithium-ion batteries work and related technologies including battery management systems. Stafl Systems is a leader in advanced battery management systems.
Pre-Charge Circuits for Lithium-Ion Battery Packs
Pre-charge circuits are an important safety and functional feature for high voltage battery packs. Why is this, and how do these circuits work? In this video, Erik Stafl, President of Stafl Systems, describes the use of pre-charge circuits in high-voltage battery system design.
Pre-charge circuits are used because the power source connected to the battery has a high capacitance. If we did not have a pre-charge circuit, there would be a very large inrush current - upwards of thousands of amps - that can weld contactors shut. We want to avoid this inrush current.
If you are new to battery pack architecture and design, we encourage you to view our previous videos prior to watching this video. ...
Pre-charge circuits are used because the power source connected to the battery has a high capacitance. If we did not have a pre-charge circuit, there would be a very large inrush current - upwards of thousands of amps - that can weld contactors shut. We want to avoid this inrush current.
If you are new to battery pack architecture and design, we encourage you to view our previous videos prior to watching this video. ...
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Видео
Disconnect Switches for Lithium Ion Battery Packs
Просмотров 16 тыс.Год назад
Every battery pack consists of a group of cells, a battery management system (BMS) and a disconnect switch. What is the purpose of the disconnect switch? How do they work, and what types of disconnect switches are best for a given pack? Where do these go in the system? Understanding these fundamental disconnect methods are critical for battery pack safety. In this video, Erik Stafl, President o...
Lithium Ion Battery Pack Architecture
Просмотров 17 тыс.Год назад
Topics Reviewed 1. Energy Storage (Wh, kWh) 2. Voltage Range (48V, 350V and 700V are some examples) 3. Size (Physical Size) 4. Weight 5. Power Levels (C-Rate) 6. Series Cells 7. Parallel Cells In this video Erik Stafl, President of Stafl Systems, discusses the architecture of lithium-ion battery packs, starting with the primary factors to consider. He then shows examples of series and parallel ...
Lithium-Ion Battery Cell Chemistries: Understanding the Differences in Cell Selection
Просмотров 15 тыс.Год назад
Topics Covered Lithium-Ion Battery Cell Chemistries 1. NMC Battery Cells 2. NCA Battery Cells 3. LCO Battery Cells 4. LFP Battery Cells 5. LTO Battery Cells 6. Energy Density 7. Battery Safety 8. Cell Thermal Performance In this video, we discuss the different lithium-ion battery cell chemistries, including NMC, NCA, LCO (high capacity, high energy); LFP; and LTO. Erik Stafl draws a chart looki...
Lithium Ion Battery Cell Selection for Battery Packs
Просмотров 17 тыс.Год назад
Topics Covered 1. Lithium-Ion Battery Cell Types 2. Cylindrical Cells 3. Pouch Cells 4. Prismatic Cells 5. Cell Sizes - 18650 and 21700 6. Thermal Performance 7. Specific Energy, Energy Density and Power Capacity In this video, Erik Stafl, President of Stafl Systems, discusses the different lithium ion battery cell types and form factors. Three primary form factors are common in the industry to...
Careers at Stafl Systems
Просмотров 3,9 тыс.2 года назад
At Stafl Systems, our goal is to engineer our way toward a future of renewable energy that we can be proud of. We are looking to continue our unprecedented level of growth into 2022 with the brightest new talent we can find. With an environment that’s fast-paced, collaborative, and highly stimulating, working with Stafl Systems will give you the tools you need to take your career in technology ...
Safe Operating Envelope for Lithium Ion Battery Systems
Просмотров 33 тыс.3 года назад
How does a battery pack report the available maximum charge and discharge currents to a system? The Safe Operating Envelope is a BMS calculation developed by Stafl Systems. In this video, Erik Stafl from Stafl Systems explains how this calculation works and what it means when calculating the capability of a battery pack. Topics Covered Safe Operating Envelope Discharge Cycles Maximum Charge Max...
Calculating the State of Health for a Lithium Ion Battery System
Просмотров 73 тыс.3 года назад
A battery's State of Health is critical to understanding how a battery degrades as it is charged and discharged over time. This degradation is caused by the increasing impedance of the cells. This video explains how this is calculated and some easier ways to understand how a Battery Management System monitors and reports this information. Topics Covered State of Health Discharge Cycles State of...
Calculating the State of Charge of a Lithium Ion Battery System using a Battery Management System
Просмотров 187 тыс.3 года назад
The State of Charge (SOC) is like the fuel gauge in your car, telling you how much energy is left in your battery system. Calculating the State of Charge in a lithium-ion battery system requires an understanding of how the battery pack capacity and energy change. This understanding is critical before diving deeper into Coulomb counting. Topics Covered State of Charge State of Charge (Capacity) ...
Battery Management System Safety and Fault Management for Lithium Ion Batteries
Просмотров 71 тыс.3 года назад
Have you ever wanted to know how your Battery Management System (BMS) helps keep you safe and manages faults? In this video, Erik Stafl, President of Stafl Systems discusses BMS safety and fault management. This technology is used for many lithium ion battery systems, including those in drones and electric vehicles. Topics Covered: BMS safety Safe Operating Area Over Voltage Fault (OV Fault) Ov...
What is a Battery Management System?
Просмотров 223 тыс.3 года назад
Have you ever wondered how a Battery Management System works? Erik Stafl, President of Stafl Systems, walks you through the basics, starting with two primary purposes of a battery management system for a lithium-ion battery pack: providing safe and reliable operation. Topics Covered: Purpose of a BMS BMS Inputs BMS Outputs Current Sensors BMS System Diagram BMS Communication The Battery Managem...
This series of lectures are very good and clearly structured and explained. Thank you for making them.
Nice video sir
Very nice thanks for teaching great work
Excellently explained sir
what is this SOE ?
How can we get it
Super clear explanation, Thank you!
Do we have a full circle recycling system?
Спасибо бро!
It comes back to 1st of system response in control system. Interesting stuff😊
hi very interesting, but what about cooling and serviceability ?
6:00 Optoisolators are your friend for this application. Usually use a combination of 3 types of switches for HV Li battery arrays, a single use fuse for safety, a Mosfet for soft disconnect, and a heavy duty relay for enable and disable main power to subsystems. ❤
Nice video i love it brother
why is the gnd of the slave of the two integrates connected by the daisy chain connected to the last cell of the master
I appreciate it so much😀
What are the parameters of the cells/batteries you are using to derive the SOE (Safe Operating Environment)?
Nice and excellent video
Very good content and in depth coverage of the subject, you have been able to condensed so much information in just in eight minutes. I have been watching so many videos on RUclips where the creators will produce hour length videos but are unable to convey so much knowledge in so little time. Keep it up, wished this would kind of become a guideline for posting content on RUclips.
Hi Erik, I am going through all your videos, as you have produced some very good content. But there is one statement you made in this video regarding the pouch cells which is in line is what I can find generally on the internet, that this particular form factor will expand and contract that requires special attention as well as kind of disadvantage it with respect to the 2 other form factors. But does the materials in the cylindrical and prismatic cells also do not face the same constraints? How do these 2 other form factors mitigate the growth in size while charging and contraction while discharging? Wish you were posting more content on RUclips. Thanks for the great work.
Thank you. Clear my explained
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Sir, charger why not on without bms?? How to on for testing without bms??
A complex topic explained so well !
excellent explaination
OK, excellent information. Do you have a SoC code using C++?
Good explanation. How does one bypass a BMS and charge a low cell via current controlled power supply at say 20% of the Ah rating rated current.
Excellently explained
These videos are amazing
Love your engineering knowledge . Thank you !!!
It's really very good video
foxBMS PCBA, ruclips.net/video/wvT09qzAMdk/видео.html
This is a great explanation that help me understand the top level of BMS.
Thank you sir....
Lto is a different kind of anode while the rest are all cathodes.
I wish I had a teacher like him in college.!!!
Thank you
Interesting
Which architecture is the best for EV cars, In terms of BMS challenges energy density and charging time?
Thank you for your insights 😊
Sir Erik, how did you derive the 160Miles from the current max range I am a little bit confused? Can you help?
Very Nice Explanation. Lots of information. Please do more videos
What a great way to explain to a beginner. The concept is very clear with this presentation and will help understanding the next levels. Thank you Sir
Wow, that was amazing. I would request you to please upload more detailed topics like you mentioned for future videos. Thanks again for sharing the knowledge
so if u unplug the battery does ot stop the cell catching fire?
Hi, I have a left over 48 volts BMS and charger from an E-bike. And I wanna use the 58 Volt charger to charge a 24 Volt 18650 battery pack. Can I use half of the BMS to charge the smaller Battery pack???
Sir please explain about DCDC/ESC converter.
Your explanation beats what my professor has covered.
Cathode is negative side not positive
Usually master disconnect possible at negative side