Recent content by SanchoSanchez

I used the Orion BMS2. It blows anything else I have used out of the water.

Agreed with Sam on this. The only thing to add in my view is a fuse on each series connection. Just to be safe against any overcurrent due to malfunction in each pack. Fuse it to the level of the highest C value of each pack, or 10-20% higher than the max current required.

Can you give some more detail on the packs? Ideally the battery type and chemistry. Is applicable number of series and parallel cells in each pack, whether there is anything between the packs to provide protection (even if it was just a fuse) I may be able to help a little more with a greater...

Can you explain a bit more about the packs....and their intended use?! Why would they be exposed to the risk of puncture for instance. The first thing i'd look at is how to better protect them. Having said that, do each pack have their own bms, or is it shared/satellite? As long as each has...

To be fair, selecting the right cell isn't too difficult. You are fairly limited in choice due to the high current (250a) requirement. Are you sure you need 250a? If so is that constant or would it be for a very short period of time. Your equipment may be capable of drawing that much but what...

This depends on the BMS, however, the general rule is that balancing won't take place again until high on the charge curve. The very slight imbalance you are seeing is perfectly normal in my experience. Be concerned if the pack is fully charged and out by more than 0.1v (again can differ for...

I sort of had that in mind when designing it. Not necessarily mass produce it, but have something of that quality. I've enjoyed the journey though and will be making more in the coming months! I've learned a lot from this forum and would like to give back so please any questions I will do my...

Hi Sam, I designed them and had them made. They are pressed and laser welded to the copper. It makes large pack making an absolute breeze, but wasn't cheap!

No, I designed these and had them made. If you are pretty capable on solidworks etc. then you could probably design your own. The copper for mine was around £500 including duty so not exactly cheap, but it barely gets warm under load which was exactly what I wanted. Shame you aren't going with...

Post some pictures. No idea if it is novel unless it can be seen.

You may want to take a look at the busbars I designed. I don't like nickel strip for high current applications and would much rather have copper. https://endless-sphere.com/forums/viewtopic.php?f=14&t=108833

Hi All, For anyone who is interested. I have attached pictures of the pack. Throughout the build and completed. Hope it helps others. :bigthumb:

Hi, Placing a fuse between your battery pack and load is your last line of defence. BMS's do a pretty good job of protecting your expensive devices but they aren't failsafe, whereas a fuse generally is. Adding a fuse is not essential but is very good practice and in my view should always be...

Hi Frank, Yes effectively correct. The nickel is only ever having to pass a single (individual) cell's energy through it, and even then for an extremely short distance. The copper is the conduit for the larger amps. The pictures above should give an idea for the flow.

Hi Frank, Apologies for the delay in responding, i've been finding it difficult to get onto the endless sphere website. The nickel inserts are spot welded onto the copper using an overhang and then spot welded onto the individual cells. The method is effective and allows for very high amps...