- UART: UART is
Universal Asynchronous Receiver/Transmitter. It transforms the data to be
transmitted between serial communication and parallel communication. As a
chip to convert parallel input signals into serial output signals, UART is
usually integrated into other communication interfaces.
- RS485: Please
choose the model RS485. RS-485 adopts balanced transmission and
differential reception, so it can suppress common mode interference.
module: if you need this function, please choose the Bluetooth module. If
you do NOT buy it, we will NOT send it to you.
- Uses top quality
(A-level) protective integrated circuit IC, from the solution of Seiko of
Japan. IC itself has a power balancing function. The circuit is simple and
- Strong load
ability, constant discharge current 80A /150A /250A, uses high voltage
resistance, low inner resistance power Mosfet. The heat sink provides great
- Typical voltage
detection for each cell. Each battery will be prevented from over-charging
or over-discharging. Over current and short circuit protection function is
very reliable. If there is a short circuit of the load for a long time it will
not affect the PCB and the battery. Temperature protection during charging
- Extreme low
power consumption. The consumption of the whole device is less than 50uA.
- The PCB uses
high anti-corrosion, high water resistance, and high impedance ESD
Discharge Current: 200A or 400A
Current Protection: 600A or 1200A
Current: 100A or 200A
Charge Voltage: 3.75V
Charge Voltage Protection Delay: 1S
Charge Voltage Release: 3.55V
Balance Voltage: 3.5V
Release Volt: 3.5V
Current: 35mA or 200mA
Discharge Detection Voltage: 2.2V
Discharge Detection Delay: 1S
Discharge Voltage Release: 2.7V
Current Detection Delay: 1MS
Current Protection Release: Off-load
Circuit Protection: External Load Short Circuit
Detection Delay: 250uS
Circuit Detection Release: Off-load
Temperature Protection: <32F (<0C) (Can be customized)
Temperature Protection: >158F (>70C) (Can be customized)
Circuit Resistor: <20 milliohms
Working Current: 100uA
Sleepy Current (When battery is over-discharged): <20uA
Temperature Range: -40~176F (-40~80C)
Temperature Range: -40~176F (-40~80C)
BMS LCD Control
Preparation before installation
the batteries are of a good consistency, the voltage difference is no more than
0.05V, the inner resistance is no more than 5 milliohms, and the capacity
difference is lower than 30mAh. Connect the batteries in parallel first and
then in series. The better the battery consistency is, the higher the
performance of the BMS.
Please use our wires for our Simple BMS. Don’t use other factories’ wires because they
don’t match up with our BMS.
B-(blue thick wire): Connect to battery pack total negative pole –
Disconnect the wires for batteries from the BMS side.
Connect the wires to batteries. Start from the thick black wire to total
negative pole (B1-), then connect the 2nd red thin wire to the 1st battery
positive pole (B1+) B2+, B3+, B4+ … till the last red thick wire.
When you are finished connecting all the wires to each battery, don’t plug into
the BMS directly. We suggest you use a multimeter to measure the voltage of two
adjacent metal terminals (You can see the white connector with silver metal
pins on the BMS). If the voltage is 3.0~4.2V (LiNCM), 2.0~3.6V (LiFePO4),
1.5~2.75V (LTO), then the wiring is correct.
Ensure the wires are connected to the batteries correctly and the voltage is
normal. Then you can plug the wires into the BMS.
P-: Connect P-(black thick wire) to load – and charger –
ordered “common port”).
connect to C-(yellow wire) load+ connect to P-(black thick wire)
ordered “separate port”).
charger+ and load+ connect to battery+. Please use thick wire.
Measure the total voltage of the pack and the output voltage of the BMS. If the
voltage is the same, it means the wiring is correct. You can use the BMS now.
Otherwise please check the wiring again according to the tips above.
Frequently Asked Questions about the BMS/PCB:
1, Which current PCB should I use?
Take a 13S 48V pack as an example: Which PCB you should use depends on the power of your motor or the current limitation of your controller. Below 350W, you can use 16A. Below 500W, you can use 18A, Below 800W, you can use 35A, Below 1KW, you can use 60A. Above 1200W, the same. If you are not sure, please contact us.
2, Can I use a bigger size of PCB than is indicated?
Suppose you need 60A PCB but you chose 80A, that will work.
80A allows for a higher current. A bit higher price is the only drawback.
But if you choose 50A, it will be too small. So you can use a higher spec but not a lower one than it should be.
3, What kind of charger should I choose?
A Lithium Battery must be charged by a Lithium Battery Charger. You can’t charge it with a lead acid battery charger because the lead acid battery charger might damage the MOS pipe of the PCB.
4, if I have a PCB, do I need any balancers?
Yes if you add QNBBM balancers, that will be perfect.
The Main function of the PCB is to prevent batteries from over-charging over-discharging, over-heating etc.
With balancers added, the batteries lifespan will be longer and the capacity will get fully used.
5, How do I judge if my PCB is broken or not?
If you’d like to judge if the PCB is fine or not, please use a multi-meter and see if the voltage of each cell is close to one other or not. When the voltage difference is 1V, the battery will have this kind of performance: the driving distance will be short, it will be cut off when started, the charging time will be very short. Under such a situation, a battery is defective. When the PCB is broken, the battery can’t be discharged. When you measure the battery voltage, it will be normal.