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The bypass removal after qualification should allow to:
This test program will show that:
No extra component than cells and their connecting.
Self-short occurs 'automatically' during Li-ion Saft cell reversal
click for larger image
CVES140 cell = 40Ah capacity when discharged at C/1,5 from 4,1V to 2,7V; 20°C
Discharge to Self-short Sequences:
Parameters influences on Self-short:
Parallel connecting: unbalanced individual current up to 100%.
Rcc is on stabilization slope after 10 cycles (C/1,5 and 20°C) and merges to the target of Rcc= f(I/C= 1/1,5)
In case of no thermal control in vacuum, the leaky cell in parallel to a healthy one overdischarges, heats, generates gasses, dries and increases its resistance to open leading to current running in the reversed good cell which pops without safety issue.
In case of thermal control, for discharge at C/1,5 to 120% DOD: Umin/95°C and correct self-short (6,4mOhm) obtained.
The plan has been established in accordance with ESA quality standards.
Bypass removal qualification within this Artès 3 program was successfully completed in May 2005.