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High Current Charging and Discharging Report for Lithium (Li

Enviado: 09 fev 2012, 21:43
por ruimegas
High Current Charging and Discharging Report for Lithium (LiFeYPO4) Cells

"The purpose of the test is to verify the life-span of the LiFeYPO4 cells in long
time run. The following questions will be answered:
1) How will the cell behave after 10 000 and more cycles
2) How will the performance of the cell be when charging
and discharging with high current (more than 1C)?
3) Will the cell overheat or have any other malfunction?
4) Will the cell age and lose its capacity?
The test is done with LFP090AH – Winston Battery LiFeYPO4 model
The cycle definition:
A) Discharge the battery with 130A current (1.5C) for 250 seconds
B) Relax for a short period (up to 250 seconds)
C) Charge the battery with 130A current (1.C) until 4.0V and then reduce
the current (up to 350 seconds)
D) Relax for a short period (up to 100 seconds) and start discharge A) again
The timing of the cycle is 950 seconds (up 16 minutes per cycle)
To make the test of 10 000 cycles, the time for testing needed is 2670 hours
(111 days). To make the test of 13 000 cycles, the time for testing needed
is 3470 hours (144 days)
The test was performed by the Czech Technical University in Prague,
Faculty of Transportation Sciences, Department of Control and
Telematics.

Conclusion of the discharge characteristics after 13 000 cycles:
There is no degradation in the performance of the cell. The cell performs the same way and no significant change
of in the discharge characteristics has been measured. "

Em: http://www.auto88.cz/_info/Tests/GWL-Po ... e-Test.pdf

Re: High Current Charging and Discharging Report for Lithium

Enviado: 09 fev 2012, 22:09
por mikexilva
Mas essa química é a mesma que é usada nas baterias do LEAF?

Re: High Current Charging and Discharging Report for Lithium

Enviado: 09 fev 2012, 22:59
por mjr
Não é a mesma química do Leaf. Além disso estes ciclos propostos são muito leves. 130A durante 250s dá 9Ah, ou 10% da capacidade da célula.