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The following modules are ordered from the negative positive terminal to the positive negative terminal, while the module numbers are as indicated on the modulesorange wire bundles. The goal of checking this is to see if the parallel connections have any imbalances.
Module #9: 12.813V
3.2696
3.2103
3.1969
3.1861
Module #8: 13.129V
3.2562
3.2650
3.2684
3.3429
Module #7: 12.661V
3.4155
3.4123
3.4132
2.4244
12.998V
3.2720
3.2380
3.2438
3.2453
13.049V 5
3.2630
3.2647
3.2598
3.2650
12.991V 4
13.100V
13.096V
13.074V
Research:
If the heat is too intense or is applied for too long during spot welding, the cell can be damaged.
If too much pressure is applied during spot welding, the cell can be deformed, especially if its casing is thin. This can compromise the integrity of the cell.
If a fully charged cell were connected to a fully discharged cell, then the more likely scenario would be that both cells are damaged.
When such a connection is made in parallel, there will be a large current flow from the charged cell to the discharged cell in an attempt to equalize their voltages. This surge can generate excessive heat, potentially damaging both cells.
It is possible that the high current can cause only the discharged cell to overheat, which might lead to swelling or leakage (neither of which were noticed in the dead cells).
The stress from high current flow may degrade the internal chemistry of the fully charged and fully discharged cells, reducing their lifespan.
Maybe the dead cell was initially degraded and died later on when discharged?
Would be worthwhile to check if cells that are adjacent to the dead cell are performing worse than cells that are further away from the dead cell.