Search found 20 matches

by SpeedRacer93
May 22 2020 9:15pm
Forum: Battery Technology
Topic: Creative Cooling Ideas?
Replies: 47
Views: 996

Re: Creative Cooling Ideas?

Your looking for a thermal pad or you could use thermal paste but would be messy. They are used in the PC industry to bridge heat to a heat sink or cooling block.
by SpeedRacer93
May 08 2020 8:48am
Forum: Battery Technology
Topic: ISO 30C to 45C rated pouch cells
Replies: 48
Views: 1323

Re: ISO 30C to 45C rated pouch cells

Sounds like a fun project. Can I ask how you estimated 90-sec. run time? Yeah it has me excited. 90 sec is a "common" average for a long course run at 250-275 mph with a constant 0.5 to 0.6 G acceleration rate. They like streamliners to do record runs on the long course so building the car with tha...
by SpeedRacer93
May 08 2020 8:02am
Forum: Battery Technology
Topic: ISO 30C to 45C rated pouch cells
Replies: 48
Views: 1323

Re: ISO high C rate cells

A couple comments here. I use these cells for my electric bike. 1. 109S4P of these cells would weigh 137lbs. Roughly. I didn't calculate the weight lost by removing all the extra wires and connectors. So, you're way under your 500lbs budget. Even add in the box, big bus bars, BMS, etc, and you're n...
by SpeedRacer93
May 07 2020 7:56pm
Forum: Battery Technology
Topic: ISO 30C to 45C rated pouch cells
Replies: 48
Views: 1323

Re: ISO 30C to 45C rated pouch cells

DD.. why dont you propose a pack using your best shot at available EV cells , targeting 400v, 1000A continuous, to estimate the weight and size. ? Not very many EV cells can pull that rate for 90 seconds. I personally have tested and use Chevy Malibu Hybrid packs on the bench. They have a higher C ...
by SpeedRacer93
May 07 2020 7:00pm
Forum: Battery Technology
Topic: ISO 30C to 45C rated pouch cells
Replies: 48
Views: 1323

Re: ISO 30C to 45C rated pouch cells

I don't understand the preoccupation with weight. It's not going airborne or the repeated accel/decel of a racing application, so I think the added weight of more battery will be useful to keep it on the ground at those speeds with no real detriment as long as you allow enough space. Quality cells ...
by SpeedRacer93
May 07 2020 2:00pm
Forum: Battery Technology
Topic: ISO 30C to 45C rated pouch cells
Replies: 48
Views: 1323

Re: ISO high C rate cells

Some of things I believe I may need to also take into account: Locked rotor phase amps effect on the max draw (ie: AMPs needed for max nM) Brushless motors won't draw max battery current at 0 rpm. It requires some rpm before you can build up to max battery current. I see it all the time with my hig...
by SpeedRacer93
May 07 2020 8:14am
Forum: Battery Technology
Topic: ISO 30C to 45C rated pouch cells
Replies: 48
Views: 1323

Re: ISO high C rate cells

(If you ask me, EV cells > Hobby grade cells. ) In many respect yes, .. ... But not much use for flying,...or racing where every extra pound is critical ! In this project every extra pound needs to be accounted for somewhere else. I would rather no compromise a couple additional tubes in the chassi...
by SpeedRacer93
May 06 2020 6:55pm
Forum: Battery Technology
Topic: ISO 30C to 45C rated pouch cells
Replies: 48
Views: 1323

Re: ISO high C rate cells

Using my spreadsheet I found that a 5 ah pouch cell with a 30C to 45C should build the lowest weight battery of 201 lbs for cells only. This is for a 320 Kw 400 Volt pack with 80% usage and 80% inverter efficiency. Found this site via the rcgroups.com forums that has some good testing results for RC...
by SpeedRacer93
May 06 2020 3:35pm
Forum: Battery Technology
Topic: ISO 30C to 45C rated pouch cells
Replies: 48
Views: 1323

Re: ISO high C rate cells

"chief shop sweeper" is a racing term for hired drivers. The saying is all you want them to do in the shop is sweep the floor. One thing I have learned over the years, is that in order to be successful as a business owner, you need to have a very strong understanding of a complex task even before yo...
by SpeedRacer93
May 06 2020 2:38pm
Forum: Battery Technology
Topic: ISO 30C to 45C rated pouch cells
Replies: 48
Views: 1323

Re: ISO high C rate cells

....or if you have the coin.. there are others... newer.. modules... $27k is about the cost of a complete ICE racing engine refresh. (ie: everything except for the block, bare heads, and maybe the crank if you are lucky) Again please post links to this newer modules or are you talking new Volt pack...
by SpeedRacer93
May 06 2020 11:42am
Forum: Battery Technology
Topic: ISO 30C to 45C rated pouch cells
Replies: 48
Views: 1323

Re: ISO high C rate cells

So...if you're tied to using USA-made cells, you may have more trouble getting cells than if you expand to world-wide manufacturing options. I am not 100% tied to USA made cells. I understand that most cell are made in AsiaPAC but if just looking for options mainly. If you're open to overseas stuff...
by SpeedRacer93
May 06 2020 11:21am
Forum: Battery Technology
Topic: ISO 30C to 45C rated pouch cells
Replies: 48
Views: 1323

Re: ISO high C rate cells

There is a myriad of better cells than the ones on that XLS list available to the American consumer, well engineered by men who build their lives around engineering... A myriad. Turnigy? maybe. Spim08? Maybe. Headways? nah lol. Some data on that xls does not have much reference to it.... and leave ...
by SpeedRacer93
May 06 2020 10:25am
Forum: Battery Technology
Topic: ISO 30C to 45C rated pouch cells
Replies: 48
Views: 1323

Re: ISO high C rate cells

Anyone putting themselves near any RC lipo while drawing 1000A at 400V will soon get a Darwin Award... Or ,.. a world record ! :shock: Remember , we are talking about extreme competition use,..not daily commuting ! Have you heard of John Metric ? I have talked with John a couple times and again his...
by SpeedRacer93
May 05 2020 12:07pm
Forum: Battery Technology
Topic: ISO 30C to 45C rated pouch cells
Replies: 48
Views: 1323

Re: ISO high C rate cells

Are you doing something similar to the BYU electric streamliner? Yes I have pulled and studied most of the papers I could find on BYU's Streamliner and Ohio State's Buckeye Bullet. My wife is an adjunct professor who has access to the academic paper search systems. That was my starting point for re...
by SpeedRacer93
May 04 2020 6:56pm
Forum: Battery Technology
Topic: ISO 30C to 45C rated pouch cells
Replies: 48
Views: 1323

Re: ISO high C rate cells

999zip999 wrote:
May 04 2020 1:37pm
Speedracer93 are you the driver ?
Yes I will be the chief shop sweeper. I am also the owner, chassis builder, and "engineer". I have friends that will be helping with body design, CFD, CNC, carbon fiber work, paint/body finish, and drink my beer/bourbon.
by SpeedRacer93
May 04 2020 9:57am
Forum: Battery Technology
Topic: ISO 30C to 45C rated pouch cells
Replies: 48
Views: 1323

Re: ISO high C rate cells

Am i reading this right, ? ...you plan to use 4wd using an i3 motor on each wheel ? We had planned on using two i3 motors inline going to a quick change "rearend" driving the front wheels only. The rear wheels would be inline has just idler wheels. Traction on the salt (specially in the last 10 yea...
by SpeedRacer93
May 04 2020 8:17am
Forum: Battery Technology
Topic: ISO 30C to 45C rated pouch cells
Replies: 48
Views: 1323

Re: ISO high C rate cells

Sounds like fun... and a very expensive hobby. Not much more to add, except with that much weight, I don't think you should be concerned about another few kilos to get a decent and "oversized" battery. Not only do better batteries tend to weigh more, (well, they have a lower energy density, so they...
by SpeedRacer93
May 04 2020 7:56am
Forum: Battery Technology
Topic: ISO 30C to 45C rated pouch cells
Replies: 48
Views: 1323

Re: ISO high C rate cells

I have no intention of critisizing your efforts and thoughts, and i am sure you have your reasons....... .....but i wonder why you are working on re=engineering a custom drive train, when those requirements are well within the capabilities of standard Tesla S components ? Weight, aero, and the amou...
by SpeedRacer93
May 03 2020 2:38pm
Forum: Battery Technology
Topic: ISO 30C to 45C rated pouch cells
Replies: 48
Views: 1323

Re: ISO high C rate cells

OK let we fill in some details. I am located in the USA and currently on semi lock down so I have doing work on a project that I have been working on the last couple years along with moving, building a new shop, life. The project is an electric land speed streamliner. It will be in the E2 class whic...
by SpeedRacer93
May 02 2020 4:15pm
Forum: Battery Technology
Topic: ISO 30C to 45C rated pouch cells
Replies: 48
Views: 1323

ISO 30C to 45C rated pouch cells

I have been working on a project and we are looking for cells that we need a high C rate. The electric motor will be running for about 90 second but be at full load (ie 1000 AMPS). Current pack design is 400 Volt 109S4P of 5 Ah pouch cells. We are still working on motor/controller development so the...