I am Jesus Toucedo, owner of Renovables del Sur, and also of evbatteryrebuilds.com, but now I write as one more user of the forum that has been mentioned.
I have read the last posts about the battery update and it seems that our video has caused quite a stir.
I want to start by saying that I agree on quite a few things discussed here, but there are others that I would like to qualify and answer for allusions.
First of all, I want to thank Emile for his contribution with the can bus bridge PCB, if none of this would have been possible or would have been a little more difficult than it has already been. We started testing with Raspberry and its solution has been by far much more elegant, professional and automotive grade.
Second, I want to confirm to Emile that indeed, this battery has only been a prototype, a proof of concept, and that in all probability it will never make a battery like this again. As a business I assure you that it is not profitable as Emile says, and we have only lost 90 days of our time, but you know that, it has been great, someone had to do it. Everything we have done in this battery has been agreed with its owner, who is aware of its limitations and virtues.
Having said this, I want to mention some commented points that I think are important to clarify:
Regarding the stacking of cells, I have access to the LG Chem technical manual on these cells, and the only mention it makes about the stacking is that a tightening with M6 screws and nuts greater than 10kgf x cm must be maintained. I can assure you that the cells have the correct compression, regardless of the number of them stacked.
Regarding the vibrations, well indeed it is a homemade pack, and it could never be a professional one, but we have done many tests and the car has been driven for 4000 km before being delivered. We have subjected it to all possible dynamic tests, acceleration, braking, inertia, potholes, and heavy off road, and after all the tests we have reopened the pack. As expected, absolutely nothing has moved, and has behaved in a stable way. Only time will tell how it goes. We can open this thread in 5 years and take some photos of the inside of the battery if it has not yet exploded
Regarding the space between cells, who said there should be? We all know that the Nissan leaf pack is a disaster dissipating heat, we also know that it is airtight and there is no air circulation inside it, nor is it possible to install a cooling system due to the design. Seriously, what else do you think I can do?
Regarding the temperature, someone asked where the probes have been placed, the probes are obviously between the LG cells. In no test have we gone from 51º celcius in Chademo fast charge, even with temperature days at 35º.
I don't know where you live, but in the south of Spain, 51º is reached by the battery in the first and only fast charge.
The current pack heats up equal to or less than the original, please give its owner some time to report his experience, I am sure that soon he will have a lot to say.
I suppose you have your opinion and of course I have mine, but I want to comment on these points:
"EVBatteryRebuilds has assembled a pack with no inter-cell barriers, no air gaps, no emergency vents, no cell-level fusing, no cooling, and no apparatus for applying even pressure to the cells."
LG cells already have their own emergency ventilation system, what else can I do? Put them in a can for even less refrigeration? I don't see the point.
Air Gaps? I have not read anything about that in the LG assembly manual .. in fact in its professional assemblies for other vehicles I have never seen air gaps between the cells.
Cell Level fusing? No refrigeration? Does Nissan use it? I didn't do the engineering for this battery pack! It would have been nice to put it .. I'm sure it would.
"no apparatus for applying even pressure to the cells." What do you mean? They have 22 pressure points on each side, calibrated to deliver the necessary pressure to each cell.
As I said before, I hope it is the last battery of this type that we make, but I want you to know that we are proud of it, although of course it is not a professional system, but on the other hand, it is impossible.
We have our way and we are going to follow it. We think that putting a lot of cells in the trunk is not a good idea for the safety of the occupants, or to keep the center of gravity of the car, and other problems related to insurance and authorities, but we are glad that at least their Users who for sure are aware of their limitations can once again enjoy their Leafs. I firmly believe that this is the true reason that unites us, to see all the Leafs of the planet on the road again. In the meantime, we will try to learn and improve with each step we take.