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Electric Goddess
Registrace 23. 06. 2020
Electric Goddess is research and development laboratory and design consultancy for battery systems.
Ep. 6 Intro to Serviceability
In our sixth episode, we speak with Luke Workman about the extent to which a battery should be serviceable. He discusses failure modes associated with cell serviceable designs and how to avoid common pitfalls. We also cover servicing in relation to the implementation of second-life batteries, and when it is appropriate to service or recycle a battery.
The level of serviceability of a battery design is an important topic for safety and reliability reasons.
Thanks for tuning in!
For more information about Electric Goddess please visit our website at electricgoddess.co
The level of serviceability of a battery design is an important topic for safety and reliability reasons.
Thanks for tuning in!
For more information about Electric Goddess please visit our website at electricgoddess.co
zhlédnutí: 217
Video
Argon atmosphere glove box
zhlédnutí 482Před rokem
Electric Goddess was founded through decades of industry experience in batteries. The lessons we have learned along the way have shaped the guidance we provide. We are constantly learning and dedicate ourselves to provide continously grow. Our skills and equipment provide quantitative data that feeds directly into the design. Keep your technology performing at its best while pushing the limits ...
Ep. 5 Intro to Electrolyte
zhlédnutí 293Před rokem
In our fifth episode, we speak with Kevin Hays and Luke Workman about electrolytes in Li-ion batteries. They discuss the differences between solid-state, liquid, and gas electrolytes, the advantages and disadvantages, and their impact on cell design. The electrolyte is an important topic in cells because it can be one of the biggest factors in cell cycle life, performance, and safety. We're gra...
Ep. 4 Intro to Battery Corrosion
zhlédnutí 290Před rokem
In our fourth episode, we dive into one of the most common causes of battery failure - corrosion. Luke speaks to methods for identifying corrosion and how it occurs, why corrosion protection is important, safety considerations during the design phase, and further testing examples. The article referenced at 09:34 can be found here (medium.com/batterybits/corrosion-the-primary-threat-to-battery-p...
5 Best Practices for Accurate Electrochemical Impedance Spectroscopy (EIS) Data
zhlédnutí 977Před rokem
This video reviews the following: 01:14 - EIS experimental setup 02:28 - Winding cables together 03:04 - 2-wire versus 4-wire measurement 05:06 - Demonstration of 2-wire versus 4-wire EIS experiment 09:00 - Alligator clip placement 10:16 - Limiting EMI with a Faraday cage 11:14 - Selecting GEIS versus PEIS 11:54 - Summary and Additional Information Additional Information: For more information o...
Selecting PEIS vs. GEIS for Battery Impedance Measurements
zhlédnutí 724Před rokem
This video reviews the following: 00:46 - Differences between a Galvanostat and Potentiostat 02:34 - GEIS versus PEIS 05:44 - Selecting GEIS or PEIS 06:38 - Demo of GEIS and PEIS experiments on a battery 07:58 - Summary and additional information Additional Information: To learn more about Admiral Instruments’ Squidstat Plus electrochemical workstation visit their website here: www.admiralinstr...
Ep. 3 Intro to Cell Balancing
zhlédnutí 464Před 2 lety
In our third episode, we talk to Luke and Bryan about their experience with balancing cells in a battery pack. They speak on when to use cell balancing, how, and considerations to be made in design. When using production-grade lithium-ion cells, minimal to approaching no cell balancing is ideal. If too much cell balancing is used, cell defect issues can be masked leading to catastrophic battery...
Ep. 2 Intro to Battery System Voltage
zhlédnutí 486Před 2 lety
In our second episode, we talk to Luke about battery system voltage. After over 16 years in the battery industry, he has worked on batteries for cell development, MW data centers, power sports, aviation, and more. He shares his perspective that high voltage battery systems shouldn’t be the first place you look to, it should be the last. For a readable summary and extra notes for clarity of subj...
Ep. 1 Intro to Battery Pack Design
zhlédnutí 914Před 2 lety
In our first episode, we talk to Luke about his background in battery research, the importance of safety, and the future of batteries. For a readable summary of this video check out our website at: www.electricgoddess.co/podcast-interviews/intro-to-battery-pack-design Thanks for tuning in!
We are Electric Goddess
zhlédnutí 1,1KPřed 2 lety
Electric Goddess provides research and development, testing, and consulting services for a sustainable future. Thank you for watching! We'd love to hear your ideas to electrify our world. We offer a complimentary introductory meeting in an effort to create less waste and encourage best practices. Please visit our website for more information or connect with us on Instagram at electricgoddess.co
Bro on the left is definitely stoned
You know how to do a electrochemical noise test with the squidstat plus?
Shockingly informative!
What was the voltage and the current selected for each experiment?
Another very great video from you Luke and Erika. Thanks you! I am curious about the opinion of Luke regarding the magnetic field around charging cables at 2500Amp DC becoming potentially dangerous for pace maker or even the requirement for higher strengh cable clamping inside the car because the interrupt current of a 100V 1000Ah battery is probably way higher than a 400V 250Ah battery right?
@47:10, Are the fiberglass pack enclosure a good solution to teh corrosion problem from the casing perspective? ( for exemple the chevy Volt packs?) and also about "breathing effect" on packs, are the Gore-tex breather a good partial or full solution? to preserve pressure equilibrium but restrain humidity passage?
Very interesting subject ! It make me think of the DIY community using "fish paper" as structural or electrical insulator on top of the cylindrical cell.. It is also a kind of Battery Murderer System to me as it trap moisture and keep it for extended period and make slow short pretty close to the cells tab! What is your opinion about that product that I thnik should never be used for battery assembly?
30:00, About the recycled second life packs idea, Would it be a great idea of using very low flow of inert gas like nitrogen circulating in the used packs to continuously or periodicaly purge the pack to reduce the effect of humdity or any other ionic path inside the pack to compromize the insulation? Thanks for sharing your awsome knowledge my Luke and thanks to Erika too!
22:14 Like and Erika, What influence the monolithic encapsulation effect can be on insulation resistance values compare to non encaplulated ( potted) pack? I guess it should be higher and more stable?
Another thing when balancing is that It happen at high SOC meaning sometime the recharge will need to be extended until the lower cells meet the higher cells voltage and will require to keep the battery at high SOC voltage for more time than when it is normally well balanced.. and so over the cycling the cells that are low will require the fully charged cells to remain longer time at full charge state while being bleeded, than the one that still continu to be charged. This will make the sooner charged cells to age faster than other and it will get a kind of chain reaction as the impedense grow and ake these to hit the HVC quicker and quicker and be bleeded often and often.
What is interesting also is the location of the BMS with his bleed resistor that sometime tend to change the thermal equilibrium in the pack while balancing/charging and make some cells to warm more than other because they are closer to the bleed resistors than others.. and so their internal resistance get lower, than the rest which will contribute to unbalanced them relative to the rest of the cells. Thanks for the video Kuke, Brian and Erika.
Can we do galvanostatic charge discharge study in squitstat plus
I know some unofficial Tesla shops repair battery packs by simply disconnecting the faulty cell from the parallel cell group making it from e.g. 86p to 85p. What are the challenges you see with this approach? It naturally increases the current and heat generation in other 85 cells, but naturally the increase is not that large as the parallel cell group is so large.
Excellent video. Very well explained !
Thank you for sharing the wisdom gained from your hard won experience!
We appreciate you!
Why?
protect certain materials from atmosphere
Awesome 💜
👍
Very informative! Thank you so much for doing this, Luke and Erika!
Way to go Electric Goddess! Making the world a better place!
Thank you for sharing.
Hey Luke since the day you did a discussion on thermal runaway propagation being a topic leader on Battery Brunch - I've been a fan of yours. Thanks for an insightful podcast again. Simply enjoyed each bit. Thanks for sharing. Cheers to Bryan and Erica
Thanks Mihir!
I learned a lot! Thanks so much!
I am a fan of large batteries that use 52V because that is the highest voltage that common power back-up inverters will run (labeled a nominal 48V). When a pack is degraded enough that it only has half the range that it had when it was new, it can still work as a home power back-up to provide 120V AC during a power outage. For someone wanting 28S, you could series two 14S packs...also, a 14S pack can be made from two seriesed 7S packs...
I am very glad that the cybertruck will be having a 48V architecture instead of 12V.. this mean it will be directly compatible with my DIY powerwall ! Oh and btw I have split some ZERO 28S battery into 14s2p to get "48V" and it work fine!
Awesome to see Erika and Luke!
Great idea and super interesting! Looking forward to hearing more from you two!
Thanks Dominic!
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Hey, I’ve been there before!
Excited to listen in on conversations with folks at Electric Goddess! Great first episode, how often can I hope to hear new episodes?
Great question! We've been gathering frequently asked questions and are working to answer them in this format. Our goal is to post as often as we can to squeeze in our long list of topics.
I would love to see more episodes on specific issues with building packs. I love all the nerdy stuff and you never hear anyone talk about these kind of real issues that just isn't sensational enough to ever hear about in mainstream EV news. Maybe even hands on examples when it's possible!
🌈 🔋 Great video! I love to see and hear about the alchemic magic that the team at Electric Goddess is working on
Congrats Luke! Looks like you guys are doing amazing work!