VL 25500-125

Rechargeable high temperature lithium-ion battery
VL 25500-125
Cylindrical, C-sized spiral cell
Reusable up to 200 times
in demanding >100°C environments.
More than 1000 typical oil drilling surveys up to 125°C.
Saft always supplies VL cells
in assemblies or as customized
battery system constructions
Benefits
●
●
●
●
●
More than 1 month life duration
in operation: floating, pulse
discharge at 125°C
Ability to perform safely and
reliably up to 125°C with severe
vibration/shock constraints
Attractive cycle life
Easy integration within multi-cell
tubular cylindrical packs
High savings on operation costs
Key features
●
●
●
●
●
Sturdy and pressure resistant
stainless steel envelope
Hermetic and corrosion-proof
glass-to-metal sealing
Redundant safety features
Withstanding very high level of
vibrations and shocks
Non-restricted for transport/
Non-assigned to Class 9
according to the UN
Recommendations on the
transport of dangerous goods Model Regulations
Main applications
●
●
●
●
Oil drilling and all downhole high
temperature environments
Measure While Drilling (MWD)
Oil and gas well monitoring
Heat sterilizable applications
March 2009
Cell size references
R14 – C
Electrical characteristics
Nominal voltage (0.4 A rate at 125°C)
3.6 V
Nominal capacity
(under 0.4 A at + 125°C with 2.5 V cut-off. The capacity restored
by the cell varies according to current drain, temperature and cut-off)
2.0 Ah
Nominal energy
7.2 Wh
Cycle life (C/5 rate, between 2.5 and 4.1 V) - (100 % DOD)
70 % original capacity still restored after:
(Cycle life depends on the using conditions, consult Saft)
30 cycles at 125°C
45 cycles at 115°C
300 cycles at 80°C
Cycle life with partial DOD (C/5 rate, below 4 V) - (25 % DOD)
70 % original capacity still restored after:
200 cycles at 125°C
Physical characteristics (unsleeved cells)
Diameter (max)
24.34 mm (0.958 in)
Height (max)
49.2 mm (1.937 in)
Typical weight
58.9 g (2.08 oz)
Lithium equivalent content
approx. 0.6 g
Operating conditions
Charge method
Maximum charge voltage
Recommended charge voltage range at 125°C
Maximum recommended charge current
Charge temperature range
Maximum continuous discharge current
Pulse discharge current
Discharge temperature range
Consult Saft for available and customized battery packs
Constant Current/Constant Voltage
4.10 +/– 0.05 V
3.8 V to 4.0 V
0.5 A (C/4 rate) at 20°C to 125°C
0/125°C
1 A (C/2 rate)
up to 1.5 A for 2 seconds
0/125°C
VL 25500-125
Typical discharge curve under C/5 rate (400 mA)
4.5
Battery assembly
In order to operate properly, individual Li-ion cells
are mechanically and electrically integrated in battery
assemblies specific to each application. The battery
assembly incorporates electronics for performance,
thermal and safety management.
Cell voltage (V)
4.0
3.5
0°C (20°C charge)
3.0
2.5
20°C (20°C charge)
115°C (115°C charge)
80°C (80°C charge)
125°C (125°C charge)
2.0
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
90
100
Capacity (Ah)
49 ± 0.2
Restored capacities during cycling
2.5/4.1 V versus temperature
2.4
80°C
115°C
125°C
Shocks and vibrations
●
●
●
Ability to withstand in the entire operating
temperature range 750 G peak/0.5 msec repetitive
shocks on axial and radial axes
(undischarged and partially discharged cells)
Ability to withstand in the entire operating
temperature range 20 GRMS random vibrations
2 to 4 hours along X, Y and Z axis
< 30 Hz
@ ≥ 6 dB/octave
30-80 Hz
@ 3 dB/octave
80-300 Hz
@ 0 dB/octave
300-1000 Hz @ -3 dB/octave
Ability to withstand in the entire operating
temperature range 1 hour of linear sine sweep at
30 G peak, from 30 to 2000 Hz along X, Y and Z axis
Storage
●
It is recommended to maintain the storage area
clean, ventilated and preferably not exceeding 30°C
Warning
●
●
Fire, explosion and burn hazard
Do not short circuit, crush, disassemble, heat above
140°C (284°F), incinerate, or expose contents to
water
2.0
1.8
1.6
1.4
1.2
1.0
0
10
20
30
40
50
60
20 min charge at 3.95 V / 4.00 V / 4.05 V following
discharge (250 mA / 10.5 s + 1.25 A / 1.5 s) during 6 min + 250 mA during 2 min
4.0
3.8
3.6
3.4
Cycling at 3.95 V
3.2
Cycling at 4 V
Cycling at 4.05V
3.0
200
400
600
800
1000
Cycle number
Saft
Specialty Battery Group
313, Crescent Street
Valdese, NC 28690 - USA
Tel.: +1 (828) 874 41 11
Fax : +1 (828) 879 39 81
www.saftbatteries.com
80
Down-hole mission profile:
end discharge voltage versus cycle number
0
12, rue Sadi Carnot
93170 Bagnolet - France
Tel.: +33 (0)1 49 93 19 18
Fax : +33 (0)1 49 93 19 69
70
Cycle number
End discharge voltage (V)
Ø 24.23 ± 0.11
Dimensions in mm.
Capacity (Ah)
2.2
Doc. No 54060-2-0309
Information in this document is subject to change without notice
and becomes contractual only after written confirmation by Saft.
Published by the Communications Department.
Photo credit: Saft.
Société anonyme au capital de 31 944 000€
RCS Bobigny B 383 703 873
Produced by Arthur Associates Limited.
1200
1400
1600