| 12V 100A EV BMS (Battery Management System) For 4 Lithium
LiFePO4 Battery Packs in Series (4S)
BMS Fundamentals Explained Instructions for Paralleling Strings of Batteries
Features for the 12V 100A 4S BMS:
- Top
Quality (A-level) Protective Circuit IC
- Strong
Load Ability, Constant Discharge Current 100A, High Voltage Resistance,
Low Inner Resistance Power Mosfet
- IC
itself has power balancing function. The circuit is simple and reliable.
- 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. Long-time short-circuit of the load
won’t affect the PCB and the battery. Temperature protection during
charging and discharging.
- Extremely
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 conformal coating
Specifications for the 4S BMS:
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CONSTANT DISCHARGE CURRENT
|
100A
|
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PEAK DISCHARGE CURRENT
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220A
|
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CHARGE VOLTAGE
|
14.4V
|
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MAX CHARGE CURRENT
|
100A
|
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OVER CHARGE PROTECTION VOLTAGE
|
3.6V
|
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POWER BALANCE VOLTAGE
|
3.6V
|
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BALANCE CURRENT
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35mA
|
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OVER DISCHARGE DETECT VOLTAGE
|
2.5V
|
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OVER CURRENT PROTECTION
|
220A
|
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SHORT CIRCUIT PROTECTION
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External Load
Short Circuit
|
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MAIN CIRCUIT RESISTOR
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<10 milliohms
|
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WORKING TEMP F (C)
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-22 to 176 (-30 to 80)
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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.
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