Recent content by SpeedRacer93

Well I just found a 2017-2019 thread that you started that talked all about cooling of LiPo pouch cells. Looks like you did a some testing and a lot of ideas came up, even DI, ATF, and Novec. https://endless-sphere.com/sphere/threads/the-thermal-management-of-lipo-thread.55074 I think...

3M is going to stop making Novec in 2025 so prices have been going up. In a previous life we had a DI water system and we used the DI water to wash computer equipment in a data center. We tested running a PC fully immersed in the DI water. Nothing high voltage but the dielectric constant and...

Chris, I have been researching immersion cooling of batteries and it may help you pull full amps from your pack. You would need to build a sealed battery box and add a pump, radiator, and the fluid which all adds weight. Weight vs more power.... You could use laboratory deionized water...

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.

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 that in mind. Once we complete our proving runs up to 175-200 MPH, I...

The pack is up to 109S7P taking into account a mistake in my formula, 80% usage, and 80% efficiency (yes I am using a low rating because of pushing to the limit.) With this new size it would 201 lbs cells only with individual cells and 248 lbs using new pre-made packs. There will be two...

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 rating then the Volt 48v modules but my luck with them on the used market is not been good. The Volt modules are only rated for 250 A...

I totally hope I don't get airborne. The car can weight a max of 2200 lbs with out driver. Here is a quick breakdown of the weights. Max weight 2200 Frame 350 Hubs 22 Wheels 80 Tires 56.8 Brakes 85 Gearbox 100 Motors 370.4 Controllers 100...

Yeah I need to get a better understand of the relationship of phase amps vs battery amps if there is one. The plan is for the motors to be about a 1.2:1 gear ratio to the wheels. With a 21.3" diameter LSR tire that will put us at about 4800 RPM at 250 MPH. We can use a push truck for the...

In this project every extra pound needs to be accounted for somewhere else. I would rather no compromise a couple additional tubes in the chassis because the battery pack was cheaper but 250 lbs heavier. Plus 250 lbs heavier battery needs to be supported and contained which requires a...

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...

"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...

$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 packs. The one issue with Volt batteries is the weight at over 450...

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. Based on JonesCG posting he is using the FEP1043125 cells which are in latest spreadsheet. I have also added the Kokam, A123, and just some other cells I have found...

Again the title of the thread is "ISO high C rate cells" please share links or just brands/part numbers to the myriad of cells you are talking about and I will add them to the spreadsheet. I do plan on purchasing sample cells and testing them against a load comparable to the designed load...