Stafl Systems
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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. Some background in electrical engineering may be helpful for most audiences.
For more information about Stafl Systems and our capability to help with your project, visit staflsystems.com.
Переглядів: 31 280

Відео

Disconnect Switches for Lithium Ion Battery Packs
Переглядів 16 тис.Рік тому
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
Переглядів 18 тис.Рік тому
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
Переглядів 16 тис.Рік тому
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
Переглядів 18 тис.Рік тому
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
Переглядів 3,9 тис.2 роки тому
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
Переглядів 34 тис.3 роки тому
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
Переглядів 74 тис.4 роки тому
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
Переглядів 191 тис.4 роки тому
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
Переглядів 73 тис.4 роки тому
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?
Переглядів 229 тис.4 роки тому
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...

КОМЕНТАРІ

  • @msb9582
    @msb9582 2 дні тому

    Thanks a lot

  • @subratghosh6331
    @subratghosh6331 8 днів тому

    very well explained. Can we have more details on sizing of LFP - selection.

  • @PeaceChanel
    @PeaceChanel 9 днів тому

    Thank You for All that you are doing for our Planet Earth.... Peace.. Shalom.. Salam.. Namaste .. 🙏🏻 😊 ✌ ☮ ❤ 🕊

  • @waleedaftab4464
    @waleedaftab4464 12 днів тому

    I have a Li-ion battery say 10AH. How can i estimate its state of health. is this possible, then how?

  • @ferdm9646
    @ferdm9646 20 днів тому

    wikipedia bullshit! should summaries at the end

  • @prathamsuthar4977
    @prathamsuthar4977 25 днів тому

    perfect

  • @MuneeswaranSaravanakumar
    @MuneeswaranSaravanakumar Місяць тому

    Then where is thermal management

  • @ninav4759
    @ninav4759 Місяць тому

    This series of lectures are very good and clearly structured and explained. Thank you for making them.

  • @lukeshbramhapurikar6499
    @lukeshbramhapurikar6499 Місяць тому

    Nice video sir

  • @nishantgupta896
    @nishantgupta896 Місяць тому

    Very nice thanks for teaching great work

  • @MuhammadQasim-92
    @MuhammadQasim-92 Місяць тому

    Excellently explained sir

  • @user-qy5qv9vp1o
    @user-qy5qv9vp1o Місяць тому

    what is this SOE ?

  • @wasiuirawo1383
    @wasiuirawo1383 Місяць тому

    How can we get it

  • @_suryakiran
    @_suryakiran Місяць тому

    Super clear explanation, Thank you!

  • @potelbat
    @potelbat Місяць тому

    Do we have a full circle recycling system?

  • @sergeymarshall3173
    @sergeymarshall3173 Місяць тому

    Спасибо бро!

  • @PLC_Pursiut
    @PLC_Pursiut Місяць тому

    It comes back to 1st of system response in control system. Interesting stuff😊

  • @guillaumevincent716
    @guillaumevincent716 Місяць тому

    hi very interesting, but what about cooling and serviceability ?

  • @christopherleubner6633
    @christopherleubner6633 2 місяці тому

    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. ❤

  • @kidsontemba1641
    @kidsontemba1641 2 місяці тому

    Nice video i love it brother

  • @-4kt
    @-4kt 2 місяці тому

    why is the gnd of the slave of the two integrates connected by the daisy chain connected to the last cell of the master

  • @gunwookim9873
    @gunwookim9873 2 місяці тому

    I appreciate it so much😀

  • @u3b93
    @u3b93 2 місяці тому

    What are the parameters of the cells/batteries you are using to derive the SOE (Safe Operating Environment)?

  • @u3b93
    @u3b93 2 місяці тому

    Nice and excellent video

  • @u3b93
    @u3b93 2 місяці тому

    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 UA-cam 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 UA-cam.

  • @u3b93
    @u3b93 2 місяці тому

    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 UA-cam. Thanks for the great work.

  • @gangu11
    @gangu11 2 місяці тому

    Thank you. Clear my explained

  • @mehditarabi4709
    @mehditarabi4709 3 місяці тому

    Goos partnership with $ampx 👌

  • @electrical_engineer1
    @electrical_engineer1 3 місяці тому

    Sir, charger why not on without bms?? How to on for testing without bms??

  • @pramodsrinivas1822
    @pramodsrinivas1822 3 місяці тому

    A complex topic explained so well !

  • @pramodsrinivas1822
    @pramodsrinivas1822 3 місяці тому

    excellent explaination

  • @edsonferraz1
    @edsonferraz1 3 місяці тому

    OK, excellent information. Do you have a SoC code using C++?

  • @meisievannancy
    @meisievannancy 3 місяці тому

    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.

  • @shakarhussain3632
    @shakarhussain3632 3 місяці тому

    Excellently explained

  • @angeltalamantes4508
    @angeltalamantes4508 3 місяці тому

    These videos are amazing

  • @Glockperfection666
    @Glockperfection666 3 місяці тому

    Love your engineering knowledge . Thank you !!!

  • @Telugu_Jathi_Galam
    @Telugu_Jathi_Galam 3 місяці тому

    It's really very good video

  • @DIY_BMS
    @DIY_BMS 3 місяці тому

    foxBMS PCBA, ua-cam.com/video/wvT09qzAMdk/v-deo.html

  • @jonhclever123
    @jonhclever123 4 місяці тому

    This is a great explanation that help me understand the top level of BMS.

  • @r.sentamizhselvan3717
    @r.sentamizhselvan3717 4 місяці тому

    Thank you sir....

  • @luongmaihunggia
    @luongmaihunggia 4 місяці тому

    Lto is a different kind of anode while the rest are all cathodes.

  • @sushilgaikwad4658
    @sushilgaikwad4658 4 місяці тому

    I wish I had a teacher like him in college.!!!

  • @davidcarmendy5244
    @davidcarmendy5244 4 місяці тому

    Thank you

  • @dctech786
    @dctech786 4 місяці тому

    Interesting

  • @sjay1970
    @sjay1970 5 місяців тому

    Which architecture is the best for EV cars, In terms of BMS challenges energy density and charging time?

  • @AmitNemade-gb8sw
    @AmitNemade-gb8sw 5 місяців тому

    Thank you for your insights 😊

  • @mikkaeldunlop1291
    @mikkaeldunlop1291 5 місяців тому

    Sir Erik, how did you derive the 160Miles from the current max range I am a little bit confused? Can you help?

  • @sudheerkumarogeti7687
    @sudheerkumarogeti7687 5 місяців тому

    Very Nice Explanation. Lots of information. Please do more videos

  • @zafarakber2230
    @zafarakber2230 5 місяців тому

    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