Killed a cell Docan lifepo4 48v home bank

[keepsake]

btw -- from the photo I wish to comment ...
In order to establish the best contact between cells, I only snug up the bolt to the studs with nothing else at that connection. All my BMS connections are a customer supplied and drilled, third, smaller stud of like 10/32, into the mid-part of the bar. Even if it impacts the shrink tubing a bit. I also use a single cell high-voltage reading on the BMS to track down any studs that need tightening. Beware of letting the BMS try to balance when the a reading is due to a poor bolt/lug tightness.

 

[keepsake]

You can also use a 'temp gun' to locate a weak/bad connection at a lug. It shows up best under high current charge or discharge times.

 

[keepsake]

Today I am looking for a thread that talks about cell expansion and bulging concerns. I presume when the battery is between 50 and 80 % under low current charging conditions that there is no way to deform a cell. Bulging is most likely caused by over-charging or excessive currents. Where is the science I still ask ?