LG Chem EM048063P3S User manual

48 V Standalone Battery Module
Service Manual

About this manual
This manual describes how to service EM048063P3S and EM048126P3S series bat-
tery modules by LG Chem. Read this manual before you attempt to service the prod-
uct. If you are uncertain about any of the requirements, recommendations, or safety
procedures described in this manual, contact LG Chem immediately for advice and
clarication.
The information included in this manual is accurate at the time of publication. How-
ever, the product specications are subject to change without prior notice. In addi-
tion, the illustrations in this manual are meant to help explain system conguration
concepts. The illustrated items may dier from the actual items at the installation
location.
NOTE
The battery modules must communicate with its higher level system using the
required communication protocol.
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Contents
1 Alerts by Status Indicators 4
1.1 Abnormalstates................................ 4
1.1.1 Fault1states.............................. 5
1.1.2 Fault2states.............................. 6
1.2 Voltageabnormality ............................. 7
1.2.1 Cellovervoltage............................ 7
1.2.2 Cellundervoltage........................... 7
1.2.3 Too low module voltage . . . . . . . . . . . . . . . . . . . . . . . 7
1.2.4 Too large voltage dierence between cells . . . . . . . . . . . . . 8
1.3 Currentabnormality ............................. 8
1.3.1 Over-charged current . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.3.2 Over-discharged current . . . . . . . . . . . . . . . . . . . . . . . 8
1.3.3 Over-charged power . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.3.4 Over-discharged power . . . . . . . . . . . . . . . . . . . . . . . 9
1.4 Temperature abnormality . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.4.1 Too high battery temperature . . . . . . . . . . . . . . . . . . . . 10
1.4.2 Too low battery temperature . . . . . . . . . . . . . . . . . . . . 10
1.4.3 Too large temperature dierence inside battery module . . . . . 10
1.5 Lostcommunication ............................. 11
1.5.1 Lost communication between battery modules . . . . . . . . . . 11
1.5.2 Lost communication with the higher level system . . . . . . . . 11
1.6 Stateofcharge................................. 12
1.6.1 ToolowSOC ............................. 12
1.6.2 ToohighSOC............................. 12
2 Replacements 13
2.1 Hot-swapping battery modules . . . . . . . . . . . . . . . . . . . . . . . 13
2.1.1 Identifying model number . . . . . . . . . . . . . . . . . . . . . . 13
2.1.2 Replacing a battery module . . . . . . . . . . . . . . . . . . . . . 13
2.2 Checkingfuse ................................. 14
2.3 ExpandingtheESS .............................. 15
2.4 ReducingtheESS ............................... 16
3 Formulas for Hot-Swapping 17
4 Block diagram of BMS 22
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Chapter 1
Alerts by Status Indicators
The status indicators on the front of a battery module show its operating state.
Normal
SOC ≥ 75%
SOC ≥ 50%
SOC ≥ 25%
SOC < 25%
Voltage imbalance
Warning
Fault 1
Fault 2
Most problems are identied by the red and blue indicators. If a battery module
seems to not work properly but its red indicator neither ashes nor comes on solid,
check the fuse of the module. See Checking fuse on page 14.
1.1 Abnormal states
NOTE
Make sure the higher level system is properly congured in accordance with the
diagnosis tables in this manual so that it can limit the amount of charge or dis-
charge current in an abnormal state to avoid failure.
There are three levels of alerts:
Warning: When a battery module is likely to become unstable, it goes into a warning
state. This state is cleared when the module recovers its normal condition.
Fault 1: When a battery module is likely to become faulty, it goes into a low level
fault state, This state may require an appropriate measure to be cleared.
Fault 2: When a battery module falls outside prescribed limits, it goes into a high
level fault state. The battery module in this state is not used anymore.
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Alerts by Status Indicators
CAUTION
Battery modules in a fault 2 state require an inspection by LG Chem. Faulty bat-
tery modules may be recovered and reused unless the cell voltage is less than
2.0 V. Unrecoverable faulty battery modules must be replaced with new ones im-
mediately. If not replaced immediately, faulty battery modules may decrease the
lifespan of the rest battery modules and cause safety problems. Contact LG Chem
or your distributor to order new battery modules for replacement.
1.1.1 Fault 1 states
When a battery module goes into a fault 1 state, the red indicator starts ashing and
the blue indicators show the fault number in binary form.
-
1The highest cell voltage is higher than the fault 1 level tolerance limit.
2The lowest cell voltage is lower than the fault 1 level tolerance limit.
3A current more than the fault 1 level tolerance limit is charged.
4A current more than the fault 1 level tolerance limit is discharged.
5A power more than the fault 1 level tolerance limit is charged.
6A power more than the fault 1 level tolerance limit is discharged.
7The battery temperature is higher than the fault 1 level tolerance limit.
8The battery temperature is lower than the fault 1 level tolerance limit.
9The dierence between the highest cell voltage and the lowest is larger than the
tolerance limit.
10 The temperature dierence inside the battery module is larger than the tolerance
limit.
11 Communication with other battery modules is lost for longer than the fault 1
level tolerance limit.
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