Page 600 - Battery Reference Book

Nickel-cadmium secondary batteries 51/37
1.4r 1. Electrolyte supply is unnecessary and the batteries
are perfectly sealed.
2. All forms of quick charging are permitted.
3. Because the batteries are perfectly sealed they may
be placed in any position to meet specific usage
requirements.
I 4. The batteries can be used repeatedly, for as many
20 30 40 50 60 70 80 90 100 as 300-3000 times (depending on the charging and
Capacity (%I discharging conditions).
(a) ZA series
5. They possess excellent electrical characteristics and
one can obtain d.c. current of uninterrupted high
2.8r
efficiency because there is hardly any internal res-
istance.
6. The batteries are suitable for all emergency power
requirements, when the battery is left in the float-
charge state.
7. Permits overcharge and overdischarge.
20 30 40 50 60 70 80 90 100 The Yuasa button Fcell is suitable for standard dis-
(b) Z22A series Capacity (%I charge requirements while the button FZ cell is suitable
for high-rate discharge (for charge and discharge char-
1.4 r acteristics see Figure 5 1.27). The Yuasa RS-type cylin-
drical cell is for high-rate discharge applications, the
NR-11 cell for high-temperature trickle charge require-
, , T b 2 . 1’.’ Discharye current
ments and the RSF cell for quick charging.
RS cells ensure steady and stable voltage even when
’ l 20 x I,o 20 x “lo 10 x Il0 2 x I,, internal resistance diminishes and discharge current
(DAonly) (VAonly)
increases. These cells can readily be used instead of
I I I I I I I
20 30 40 50 60 70 80 90 100 dry cells.
IC) DA and VA series (%) NR-H cells maintain their rated capacity even under
high-temperature conditions and are more suitable for
Figure 51.24 Discharge curves of Carefree II sealed nickel-cad- continuous trickle charging at high temperatures. Con-
mium button cells series 2A.
sequently, these cells are recommended for emergency
lighting and indicator lamps as an emergency standby
cylindrical type with sintered plates (Tables 51.44 power source. The cells have a high charging effi-
and 51.45). These batteries permit overcharge and ciency, even at high temperatures, and have excellent
overdischarge without any deterioration in perfor- discharge characteristics. A comparison of the dis-
mance characteristics. Features claimed by Yuasa for charge performance of RC and NR-H cells is given
their batteries include the following: in Figure 51.28.

Table 51.43 Standard Ever Ready range of sintered plate cylindrical cells
Size Re$ No. IEC Nominal Max. MU. Weight
designation capacity* diameter height (approx. 1
(A h) (mm) (mm) (g)
113AA NCC 12 0.12 14.3 17.1 8
1l2AA NCC24 0.24 14.3 28.1 14
AA NCC5O KR15/51 0.50 14.3 50.0 25
Super AA NCC60 KR16/5 1 0.60 15.6 50.0 30
RR NCC 120 KR23/43 1.20 22.8 42.7 50
C NCC200 KR27/50 2.00 26.0 50.0 78
$D NCC230 2.30 34.0 38.8 100
Dm NCC350 3.50 32.5 51.5 146
D NCC400 KR35/62 4.00 34.0 61.0 170
F NCC700 KR35/92 7.00 34.0 91.0 255
- NCClOOO KR44/9 1 10.00 42.0 91.4 410
* Defined as that which will be obtained when fully charged cells are discharged at such a rate as will bring them to an end-point of 1.OV in 5 h