ElectricEddy wrote:When the pack is manufactured, it is assembled and enclosed in an uncontaminated and sterile environment. Would not opening the the pack and servicing the cells not expose the remaining pack to say high humidity levels and develop into corrosion , or various other contaminants?
I guess a new module is better than no module but IMHO have reservations about it.
I can answer this as I have opened and worked on 8 packs so far.
While the pack is wheather-proof, itis *not* air tight.
In fact, if you remove the service disconnect you can look right into the pack, as the O-ring to seal the disconnect plug is in the plug itself that you pull out.
In addition, Nissan does not want to risk problems with pressure difference between inside and outside of such a big enclosure, that could easily lead to deformation, so there are 4 breather openings on the 2011/2012 packs (cost optimised to 2 on 2013+ packs), so ambient air can flow into and out of the shell and equalize pressure. In some conditions this could indeed cause some buildup of moisture from condensation, but the continuous breathing will also allow that to vaporize and dissipate over time again.
Hope this clarifies.