REX Series Battery Cyclic Performance

NARADA POWER SOURCE CO., LTD.
Add: Building A, No.822 Wen'er West Road, Hangzhou, Zhejiang, China. 310030
Tel:[phone] Fax:[phone]
Website: www.naradabattery.com Email: [e-mail]
BATTERY CYCLIC PERFORMANCE CALCULATION AND ESTIMATION
V1.6 21
st
Oct. 2015
1. Ideal Cyclic Performance
1.1 REX Series Cyclic Test Result
Graph 1, Cycle life vs. DOD of REX Series with Ideal Charge Model
Table 1, data of cycle number
Depth of Discharge/DOD
20%
40%
60%
80%
Cycle life
11200
4800
2700
2000
1.2 Discharge & Charge Scenario (80%DOD)
1) Cycle method: Discharge with 2I
10
for 4 hours (80% DOD), charge with 2I
10
for 3.5hour +
I
10
for 0.5hour + 0.25I
10
for 3.5hour. This is one cycle.
2) Residue Capacity determination: The batteries are discharged at 10 hour rate after every
50 cycles to test battery capacity. When residue capacity of 10 hour rate capacity is lower than
80%, test is ended.
After discharge at 10 hour rate after every 50cycles, the charge method is: charge 80% of
discharged capacity with current of 2I
10
+ charge 20% with current of I
10
+ charge 20% with
current of 0.4I
10
(i.e. charge 120% of discharged capacity)
3) Temperature: 25℃
1.3 Advantage of Upper Constant Current Charge Model
Battery can be completely recharged within 8 hours.
The end charge voltage will be higher than 2.6Vpc, which is good for active material exchange.
1.4 Disadvantage of Upper Constant Current Charge Model