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Operational advantages
The submerged autonomy is increased due to the high energy density of the Li-Ion technology.
The procedure of charge of a lead-acid battery does not permit to reach the total capacity at sea. The knowledge of the state
of charge of a lead acid battery is uncertain, so in practice, the discharge is stopped until the remaining capacity is below
20% of the nominal capacity. Due to these 2 factors, the capacity used in practice at sea for a lead acid battery does not
exceed 60% of the nominal capacity.
With Li-Ion Technology, it is possible to proceed full charge at sea. The capacity measurement is easier and more confident
and we can expect to use 95% of the nominal capacity at sea.
So, the improvement of the diving autonomy for a Scorpene submarine type equipped with Li-Ion battery is more than 75%
at low speed and 200% at high speed (see Figure 3: submerged autonomy gain with Li-Ion technology)
250%
i
d

a
c
d 200%

l
e
a
i
t
h
y 150%

w
a
t
t
e
r
a
r
e
d
b 100%
p
m

c
o
50%
a
i
n
G
0%
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Speed (Knots)
Figure 3: submerged autonomy gain with Li-Ion technology
The charge efficiency is greater than lead acid battery. Furthermore, maximal intensity charge is greater. Due to these 2
Feature 5
characteristics, the indiscretion ratio can be reduced (see Figure 4).
The comparison takes into account the same depth of discharge for the both technologies (100%).
providing reliable energy storage for
Decrease of indiscretion ratio (%)
essential back-up services.
The company says it believes the main
25%
advantages of Li-ion batteries are:

20%
improved autonomy

greater reliability 15%

longer sustained performance at speed
10%

small size

high capacity
5%

long life and low life-cycle costs
0%

enhanced stealth characteristics 345678
Speed (knots)
Li-ion batteries are also ideally
suited for use as buffer batteries in AIP Indiscretion ratio gain with Li-Ion technology.
Figure 4: Indiscretion ratio gain with Li-Ion technology
systems, and for power for actuators, the
In the case of arrangement describes in Figure 2, the integration of Li-Ion battery permits to increase the fuel oil capacity due
company notes.
to the fact that
and an el
the volume of batt
ectrolyte th
ery compartmen
at is a ble
ts can be reduce
nd of var
d.
ious power /energy ratios, by using
Saft’s Li-ion cell for naval applications
T
c
h
a
e
rb
inc
o
re
n
a
a
s
t
e
e
of
s
t
o
he
lv
fu
en
el
ts
oil c
+
ap
L
ac
iP
ity
F6.
and t
I
h
t
e
i
b
s
et
222mm
ter indiscre

tion
e
ra
le
te
c
p
t
e
r
r
o
m
des
its to
w
inc
it
re
h
as
dif
e dr
f
a
er
sti
en
call
t
y
t
th
hic
e au
k
to
n
n
es
om
s
y
es
of
a
th
n
e
d
is the VL45E cell. This cell, originally high with a diameter of 54mm and mass surfaces – a high-energy cell has thick but
Safe Lithium ion naval energy storage systems and application 11/13
developed for electric vehicle applications, of 1.1kg. It has a capacity of 45A
on
h
bo
@
ard S
C/3,
corpene co
s
n
h
ve
o
nt
r
io
t
na
e
l
le
su
c
bm
tr
a
o
rin
des,
e
whilst a high-power one
is also qualified for space-based energy is 160Wh @ C/3, voltage range is will be fitted with long, thin electrodes.
applications, such as in satellites, in two 2.7 to 4.0V and mean voltage is 3.6V. Although lower in power than standard
very closely related designs, the VES 140S Saft notes that Li-ion technology Saft high-power Li-ion cells, VL45E cells
and VES180. The VL45E has a graphite- enables it to manufacture a wide range are ideally suited for conditions requiring
based anode, nickel oxide-based cathode, of cells of similar mass and volume with a battery capable of tolerating abuse, such
Warship Technology January 2009 37
WT_Jan09_p36+37+38.indd 37 12/23/08 2:26:03 AM
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