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8.1

Charging generalities

The block battery can be charged
by all normal methods. Generally,
batteries in parallel operation with
charger and load are charged
with constant voltage. In operations
where the battery is charged
separately from the load, charging
with constant current or declining
current is possible. High-rate charging
or overcharging will not damage the
battery, but excessive charging will
increase water consumption to some
degree.

8.2

Constant voltage charging

methods

Batteries in stationary applications
are normally charged by a constant
voltage float system and this can be
of two types: the two-rate type, where
there is an initial constant voltage
charge followed by a lower voltage
floating voltage; or a single rate
floating voltage.

The single voltage charger is
necessarily a compromise between
a voltage high enough to give an
acceptable charge time and low
enough to give a low water usage.
However it does give a simpler
charging system and accepts a
smaller voltage window than the
two-rate charger.

The two-rate charger has an initial
high voltage stage to charge the
battery followed by a lower voltage
maintenance charge. This allows the
battery to be charged quickly, and
yet, have a low water consumption
due to the low voltage maintenance
level.

The values used for the block battery
ranges for single and two-rate charge
systems are as shown in Table 5
below.

To minimize the water usage, it is
important to use a low charge voltage,
and so the minimum voltage for the
single level and the two level charge
voltage is the normally recommended
value. This also helps within a voltage
window to obtain the lowest, and most
effective, end of discharge voltage (see
Battery sizing chapter 7).

The values given as maximum are
those which are acceptable to the
battery, but would not normally be
used in practice, particularly for
the single level, because of high
water usage.

19

8.

Battery charging

single level (V) two level (V)

min max min max floating

SBH 1.43 1.50 1.45 1.70 1.40

SBM 1.43 1.50 1.45 1.70 1.40

SBL 1.43 1.50 1.47 1.70 1.42

Table 5 - Charge and float voltages for the block battery ranges

BlockBat 3/11/98 10:12 Page 24

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Содержание SBL

Страница 1: ...Nickel cadmium block battery Technical manual...

Страница 2: ...lly safe 4 2 13 Low life cycle cost 4 3 Electrochemistry of nickel cadmium batteries 5 4 Construction features of the block battery 6 4 1 Plate assembly 7 4 2 Separation 8 4 3 Electrolyte 8 4 4 Termin...

Страница 3: ...technical manuals are available which address the particular characteristics of these ranges 6 7 Cycling 14 6 8 Effect of temperature on lifetime 14 6 9 Water consumption and gas evolution 16 7 Batter...

Страница 4: ...nd operating characteristics of the Saft Nife pocket plate block battery to enable a successful battery system to be achieved A battery which while retaining all the advantages arising from nearly 100...

Страница 5: ...see section 9 2 Mechanical abuse 2 8 High resistance to electrical abuse The block battery will survive abuse which would destroy a lead acid battery for example overcharging deep discharging and high...

Страница 6: ...in the electrochemistry of the process and are naturally corroded during the life of the battery The charge discharge reaction is as follows During discharge the trivalent nickel hydroxide is reduced...

Страница 7: ...blocks of 1 10 cells depending on the cell size Plate group bus Connects the plate tabs with the terminal post Plate tabs and terminal post are projection welded to the plate group bus Separating grid...

Страница 8: ...ssembly The nickel cadmium cell consists of two groups of plates the positive containing nickel hydroxide and the negative containing cadmium hydroxide The active materials of the Saft Nife pocket pla...

Страница 9: ...n the cell plates irrespective of the charge level In most applications the electrolyte will retain its effectiveness for the life of the battery and will never need replacing However under certain co...

Страница 10: ...d 4 They can be recognized from the block dimensions as follows Block width mm Block height mm Plate module 123 194 1 123 264 2 195 349 3 195 405 4 Table 1 Correlation between block dimensions and pla...

Страница 11: ...e different discharge types The choice is related to the discharge time and the end of discharge voltage There are of course many applications where there are multiple discharges and so the optimum ra...

Страница 12: ...cations 5 3 Type H The SBH is designed for applications where there is a demand for a relatively high current over short periods usually less than 30 minutes in duration The applications can have freq...

Страница 13: ...sistance of a block battery cell depends on the performance type and at normal temperature has the values given in Table 3 in milliohms per Ah of capacity To obtain the internal resistance of a cell i...

Страница 14: ...e for operating temperatures from 30 C to 50 C Figure 1 a Temperature derating factors for H type plate 1 2 1 0 8 0 6 0 4 0 2 40 20 0 20 40 Derating factor special electrolyte required for continuous...

Страница 15: ...ncountered in stationary applications This can vary from low depth of discharges to discharges of up to 100 and the number of cycles that the product will be able to provide will depend on the depth o...

Страница 16: ...s reduced to less than 1 year if used at 50 C 15 Figure 2 Capacity loss on open circuit stand 100 90 80 70 60 50 0 50 100 150 200 250 300 350 400 Percentage of initial capacity 40 C Open circuit perio...

Страница 17: ...f discharge of the electrodes The overcharge current is a function of both voltage and temperature so both have an influence on the consumption of water Figure 5 gives typical water consumption values...

Страница 18: ...previous discharge The factors used for this will depend on the depth of discharge the rate of discharge and the charge voltage and current A requirement for a high state of charge does not justify a...

Страница 19: ...and so the minimum voltage for the single level and the two level charge voltage is the normally recommended value This also helps within a voltage window to obtain the lowest and most effective end o...

Страница 20: ...w than the two rate charger The two rate charger has an initial high voltage stage to charge the battery followed by a lower voltage maintenance charge This allows the battery to be charged quickly an...

Страница 21: ...tage 1 50 volts per cell Charge Time hours Charging Voltage 1 40 volts per cell Charging Voltage 1 45 volts per cell Charging Voltage 1 55 volts per cell Current Limit 0 2 C5A Temperature 20 25 C H ty...

Страница 22: ...harge times from a fully discharged state for the L block 130 120 110 100 90 80 70 60 50 40 30 20 10 0 0 5 10 15 20 25 30 35 Available Capacity of rated capacity Charging Voltage 1 50 volts per cell C...

Страница 23: ...A constant current first charge is preferable and this should be such as to supply 300 of the rated capacity of the cell Thus a 250 Ah cell will require 750 ampere hours input e g 50 amperes for 15 h...

Страница 24: ...cid batteries this will lead to failure of the battery and is unacceptable The block battery is designed to make recovery from this situation possible Overcharge In the case of the block battery with...

Страница 25: ...0 45 liters of hydrogen 10 Installation and storage 10 1 Batteries on arrival On receiving the battery open the cases and check for any indication of damage in transit Remove the cells and any access...

Страница 26: ...0 45 liters of hydrogen 10 Installation and storage 10 1 Batteries on arrival On receiving the battery open the cases and check for any indication of damage in transit Remove the cells and any access...

Страница 27: ...of 2 for example the air in the room will need changing 3 2 1 5 times per hour In practice a typical figure for natural room ventilation is about 2 5 air changes per hour and so in this case it would...

Страница 28: ...of 2 for example the air in the room will need changing 3 2 1 5 times per hour In practice a typical figure for natural room ventilation is about 2 5 air changes per hour and so in this case it would...

Страница 29: ...tery operations the electrolyte will retain its effectiveness for the life of the battery Thus normally it is not necessary to change the electrolyte However under certain battery operating conditions...

Страница 30: ...Saft Argentina SA Buenos Aires Tel 54 11 4 686 1994 Fax 54 11 4 686 1925 AUSTRALIA Saft Pty Ltd Seven Hills Tel 61 2 9674 0700 Fax 61 2 9620 9990 BELGIUM NV Safta SA Brussels Tel 32 2 556 44 00 Fax 3...

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