5.1. Operating temperature
Due to the electrochemical
reaction, all Ni-Cd batteries
generate heat during charge and
discharge. As STM monoblock
batteries are batteries of high
energy density, and they are
used in regular cycling, particular
attention must be paid to the
temperature of the battery.
Daily use in electric vehicles
requires the control of the
temperature and the installation
of a cooling system to prevent
the authorized maximum
operational temperature from
being exceeded.
The temperature measured inside
a central cell must always be
below + 60°C.
!
Temperature during charging
For optimum battery performance
and life, it is preferable to begin
charging at an internal battery
temperature of below + 35°C.
This means, in practice, after a
discharge, it is necessary to take
enough time to let the battery cool
down to below + 35°C before
starting the charging operation.
Charges at higher temperature
are always possible, but the
battery capacity and its useful life
will progressively be reduced.
Nevertheless, full capacity will be
restored after some full charges at
temperatures below + 35°C.
5.2. Two-level charge
5.2.1. Normal charge
In cycling applications, STM
batteries are preferably charged
at constant current between 0.15
and 0.2 C
5
A.
5.2.2. Fast charge
It is possible to recharge up to
80% with a current between 1
and 1.5 C
5
A.
The fast charge current is applied
as follows:
•
STM 5-100 MR-MRE: 150 A
•
STM 5-140 MR:
210 A
5.2.3. Maintenance charge
This is a normal charge with a
higher overcharge coefficient that
will permit increased capacity.
At its term, the battery is topped-
up with water.
5. Operation
14
Summary of Contents for STM 5-100
Page 1: ...Technical manual installation operation and maintenance for Ni Cd STM MR MRE monoblocks type ...
Page 23: ...Appendix 1 20 Monoblock STM 5 100 MR G RD equipped Positive left Filling right ...
Page 24: ...21 Appendix 2 Monoblock STM 5 100 MRE G RD equipped Positive left Filling right ...
Page 25: ...Appendix 3 22 Monoblock STM 5 140 MR G RD equipped Positive left Filling right ...
Page 26: ...Appendix 4 23 Monoblock STM 5 140 MR D RG equipped Positive right Filling left ...