Interesting. I really like the big posts they use on all their batteries.The 100Ah "fortune" cells actually come from Jiangsu Frey.
Interesting. I really like the big posts they use on all their batteries.
https://frey.en.alibaba.com/product....icbuShop.41413.42.e4d718ccxIFmSc&filter=null
I sent a message to Jiangsu Frey for pricing on their 8 cell packs.
https://frey.en.alibaba.com/product...h_lifepo4_battery_rechargeable_batteries.html
I asked price and shipping for 1 pack and 10 packs (possible group buy).
I would for sure be interested in the 200ah version if they have the big posts and the cool tops and bottoms on them. I'm thinking about trying to 3d print those for the 280ah cells in some other posts.I sent a message to Jiangsu Frey for pricing on their 8 cell packs.
https://frey.en.alibaba.com/product...h_lifepo4_battery_rechargeable_batteries.html
I asked price and shipping for 1 pack and 10 packs (possible group buy).
Totally agree .. unless you are running 1C or higher then airflow and circulation is minimal concern .. heck at 2C as long as you have the ability to get heat to escape you are fine .. we don't use fans at all until we are talking LARGE systems and high C ratings .. anyone that has to strap cells together to keep them from bulging is totally screwed anyway ... the cells are still DESTROYED - all you have done is kept them from bulging ...
Mechanical Installation
It was once thought prismatic cells could be operated in more or less any position as they do not really contain free liquid. Nowadays manufacturers are a lot more prescriptive with installation position. In most instances, the only acceptable position is upright, vent cap and terminals on top (Sinopoly, Winston). Sometimes it may be acceptable to mount them on edge, with the terminals on the side (CALB). This may vary not only between manufacturers, but also between cell models, so seeking specific guidance is a sensible step if an odd installation position is being considered.
When questioned, Sinopoly indicated that installing the cell in any other position than upright would cause some of the plates to run dry after a while, damaging it. Installing them flat on their side is out of the question in all cases.
The cells must be installed securely in such a way that no movement is possible in relation with each other, or it will stress the terminals and link plates. Prismatic cells should also be clamped together between compression plates as the application of a modest amount of pressure helps with preventing electrode delamination, even more so in the presence of shocks and vibrations as found on marine vessels. It also helps with preventing the internals of the cells from shifting in case of violent shock, which can lead to internal cell short-circuits. Clamping is a common warranty condition from manufacturers. Strapping the cells together is simply not good enough for that matter.
The bank must also be installed in such a way that it can’t shift and nothing can come and short-circuit the cell terminals. This can involve fitting a cover over the cells.
The guy from Nordkyn design says this:
So he talks about avoiding electrode delamination by adding pressure. I recall watching a BYD dissasembly video and indeed they are tighly packed together (Altough they are designed for high C rates).
Considering all of this since if this is an issue in our systems my mounting design its terribile for lifepo4:
Checkout my design! - Vertical mounting of prismatic LIFEPO4
So my 16 x 280AH Lifepo4 cells finally arrived. Now its the time to start building the battery pack's! 24V System for an hybrid inverter LV2424 2 x Battery Pack with 8 Cell each one, connected in series. Daly 200A BMS for each pack. 100A Fuse for each pack. Both packs connected in parallel with...diysolarforum.com
- Mounting the cells by their side
- Not straping the cells together and adding pressure.
So clamping and strapping are different, and "Clamping is a common warranty condition from manufacturers.".
The quoted bit should be easy to verify.
Is clamping further defined anywhere?
Does a snug fitting plywood box(which leaves the top unclamped) suffice?
I'm thinking of a tube of toothpaste.
So not that common and basically a tempest in a teacup.<snip> ....There are some LFPs that are designed to actually need to be clamped but the only time I have sen those was in UPS's of some sort<snip>