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If the charging current becomes more than the charge
overcurrent protection current is limited to 10A.
Overcurrent protection:
The overcurrent protection delay is 4±1 s.
Charge overcurrent protection is released
immediately, no delay, when discharge is started.
Short-circuit protection:
The short circuit protection delay is 300 µs or
faster.
The short circuit protection state can be released by
pressing the button to reset the system. It is then
necessary to remove the load first.
Over temperature
Over temperature
Charge, Over temperature alarm
Charge, Over temperature protection
Charge, Over temperature recovery
Discharge, Over temperature alarm
Discharge, Over temperature
protection
Disharge, Over temperature recovery
If the maximum cell temperature becomes higher than cell
overtemperature protection threshold, BMS enters cell
overtemperature protection state and inhibits charging
and discharging.
If the cell temperatures return to the normal temperature
range, the temperature protection is released, then the
system restores charge and discharge respectively.
Under temperature
Under temperature
Charge, Under temperature
alarm
Charge, Under temperature
protection
Charge, Under temperature
recovery
Discharge, Under temperature
alarm
Discharge, Under temperature
protection
Discharge, Under temperature
recovery
If the minimum cell temperature becomes lower than cell
under temperature protection threshold, BMS enters cell
under temperature protection state and inhibits charging
and discharging.
System
Cell
55±2°C
55±2°C
60±2°C
60±2°C
45±2°C
45±2°C
55±2°C
55±2°C
60±2°C
60±2°C
45±2°C
45±2°C
System
Cell
5±2°C
5±2°C
0±2°C
0±2°C
8±2°C
8±2°C
5±2°C
5±2°C
-20±2°C
-20±2°C
-10±2°C
-10±2°C
If all of the cell temperatures return to the normal
temperature range, the cell temperature protection is
released, and then the system restores charge and
discharge respectively.
2.3
Capacity
The rated capacity of Battery Unit is stated in the datasheet.
The available capacity of the system will be dependent on
the battery temperature and the current, see example
below.
Available Capacity @ different temperatures
120
100
80
60
40
20
0
-35 -25 -15
-5
Temperature [°C]
2.3.1 C-Rate
In this document, charge and discharge rates are expressed
as C-rates. C-rate is the current normalized to the rated
capacity of a battery.
Example: 1C represents the current required to discharge a
battery in one (1) hour. 0.1C (which can also be written as
C/10) is the current required to discharge a battery in ten
(10) hours.
Example of available capacity in different C rates in the
below figure.
Available capacity
Discharge Rate [C]
5
15
25
35
45
55
5
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