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Quick Link Downloads |
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| Samsung 50E Datasheet | JBDTools V1.6-20170622 | ||
| BMS Apps | BMS Settings 13s5p 48.1v | ||
| BMS Wiring |
USB Drivers | ||
13S 60A BMS WITH BLUETOOTH
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| 13S Lititium ion Smart BMS Charger (Discharge 60A Continious) | ||
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| PC Communication Tool Connected to The BMS | BMS Bluetooth Module (Please note 10v supply) | |
The black vertical lines show the capacity of each cell with a current draw of 5A at various voltage cuttoff limits. The first black line shows the capacity of each cell when a 3.1V cutoff is used. The peak cell voltage set at 4.1V you only loose 25mAh, the lower the upperlimit the greater the longevity of the battery. Using 4.1V to 3.1V would give a cell capacity of around 4050mAh - 25mAh = 4025mAh..
Click here to download the Samsung 50E datasheet
The chart below shows various BMS settings when using a 5A per cell (25A) discharge rate
| Pack Capacity | Cell Capacity | Nominal Voltage | Watt Hours |
High Pack Voltage | Low Pack Voltage | High Cell Voltage | Low Cell Voltage | Usable Capacity | |
| 1 |
18.62Ah | 3725mAh | 48.1V | 895Wh | 52.00V | 41.60V | 4.00V | 3.20V | 76.02% |
| 2 |
20.06Ah | 4012mAh | 48.1V | 964Wh | 52.00V | 40.30V | 4.00V | 3.10V | 81.18% |
| 3 |
20.25Ah | 4025mAh | 48.1V | 974Wh | 53.30V | 40.30V | 4.10V | 3.10V | 82.14% |
| 4 |
21.37Ah | 4275mAh | 48.1V | 1027Wh | 53.30V | 39.00V | 4.10V | 3.00V | 87.24% |
| 5 |
22.37Ah | 4475mAh | 48.1V | 1075Wh | 53.30V | 37.70V | 4.10V | 2.90V | 91.32% |
| 6 |
24.50Ah | 4900mAh | 48.1V | 1178Wh | 54.60V | 32.50V | 4.20V | 2.50V | 100.00% |
Below is a table used in setting the BMS up to a 48.1v Nominal - 20.25Ah (Usable) battery with a range of 4.1V to 3.1v - 53.3V - 40.3V (Number 3 in the list)
| Capacity (V) | Cell Voltage (mV) | Battery Voltage (V) |
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| 100% | 4100 | 53.3 |
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| 80% | 3900 | 50.7 |
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| 60% | 3700 | 48.1 |
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| 40% | 3500 | 45.5 |
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| 20% | 3300 | 42.9 |
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| 0% | 3100 | 40.3 |
| The % capacity in mV for each cell voltage is calculated by
(Cell maximum voltage - Cell Minimum voltage) /5 4100mV - 3100mV = 1000mV 1000mV/5 = 200mV |
From the cell minimum voltage, the 20% Capacity setting would be
3100mV + 200mV = 3300mV From the cell minimum voltage, the 40% Capacity setting would be 3100mV + 400mV = 3500mV |
This would continue to the cell maximum voltage setting to 4100mV, we do not need this value for these settings, but is a useful guide to check the math is correct.
We are charging these batteries with a 54.6V 3A charger, roughly we are charging each cell at 0.6A (3A / 5) which is well below the charge rate of 2.45A, for the Samsung 50e. When charging at 0.6A we would see an increase in capacity of charge, although not tested. We could charge at 5A for a faster charge if needed, we set the maximum charge on the BMS at 5.5A, although this would reduce the lifetime of the battery and charging capacity.
The above diagram shows the charge time for our battery charging at 3A. Time to full charge approx. 6 hours, allow an extra hour on full charge for the cells to balance, the app will show you when all cells are balanced.
BMS Android Apps
The file is a zip file with 3 versions of the app, some versions work better on different phones. Download the files on a pc or laptop, you will need to unzip the files, then transfere them to your phone to install. Some versions of the app work better on different phones and android versions. There is a cutdown version on google play store but does not have all the extended features.
Click here to download the apps
PC Software
Below are links for software for the PC data port, its USB drivers and setting up instructions
JBDTools (BMS) Detailed parameter settings
Download and unzip the above files
Click here to download the zipped BMS file
Unzip the BMS file
Install JBDTools (and USB drivers if needed)
Open JBDTools
Click on the "COM" Button and select your com port that the USB is connected to
Click on the "Start" button, if you have selcted the correct com port and the usb drivers are working you should be able to use the software
Press the Open "Eprom" button
Select the unzipped BMS file and open the file
This then will populate the fiekds in JBDTools.
If you make changes to the settings use the "Save Eprom" button to make a back up
Next click the "Write Eprom" button, this should now program your BMS
Check that your settings have been applied by selecting the "Read Eprom button", if your values change back to default setting, re wite the BMS file to the BMS
Below is a screen shot of the pc communication software set up for our rack battery, 48.1v 13s5p using Samsung 50e cells, voltage ranges from 4100mv to 3100mv (No 3 in the table above). The charge over protection current has been set to 5.5A giving us the option to use a 5A or 3A charger.
Abbreviations
| COVP | Charge Over Voltage Protection |
| CUVP | Charge Under Voltage Protection |
| POVP |
Pack Over Voltage Protection |
| PUVP | Pack Under Voltage Protection |
| CHGOT | Charge Over Temperature |
| CHGUT | Charge Under Temperature |
| DSGOT | Discharge Over Temperature |
| DSGUT | Discharge Under Temperature |
| CHGOC | Charge Over Current |
| DSGOC | Discharge Over Current |
| Design Cap | Pack capacity = Each cell (4900mah) x No if cells in parallel (5) |
| Cycle Cap | Pack Actual Capacity = Each cell (4525mAh ) x Number of cells in parallel (5) |
| Full Chg Vol | Designed full charge voltage of each cell |
| End of Dsg Vol | Designed end of discharge voltage of each cell |
| NTC 1 & NTC 2 | Temperature sensors 1 and 2 (on/off) |
| BALANCE_EN |
Enable balance during normal running |
| CHG_BALANCE |
Enable balance during charging |