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Protection Circuit Board
4S 120A Lithium Battery BMS PCM/PCB for 12.8V Lithium LiFePO4 Battery
4S 120A Lithium Battery BMS PCM/PCB for 12.8V Lithium LiFePO4 Battery
4S 120A Lithium Battery BMS PCM/PCB for 12.8V Lithium LiFePO4 Battery
4S 120A Lithium Battery BMS PCM/PCB for 12.8V Lithium LiFePO4 Battery
4S 120A Lithium Battery BMS PCM/PCB for 12.8V Lithium LiFePO4 Battery

4S 120A Lithium Battery BMS PCM/PCB for 12.8V Lithium LiFePO4 Battery

Regular price $89.96 Sale price $129.96 Unit price per
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Product Description :

Model: DG4S120A

Constant discharge current: 120A

Constant charge current: 120A

Charge wire and discharge wire share the same one

We can customize any PCB from 2S to 24S lithium batteries with different current.

1.Overview

DG4S120A PCB is used for 4series battery pack. We can design it for various lithium batteries like LiFepo4, LiMn2O4, and Li-polymer etc.

The main functions are: over charge protection, over discharge protection, over current protection, short-circuit protection, temperature protection etc.

 

2. Advantage

◆Use top quality (A-level) protective integrated circuit IC, from the solution of Seiko of Japan.

◆Strong load ability, constant discharge current 120A, use high voltage resistance, low inner

resistance power Mosfet. The heat sink will greatly help cooling.

◆IC itself has power balancing function. The circuit is simple and reliable.

◆Typical voltage detection for each cell. So each battery will be prevented over charged or over discharged. 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.

◆Extreme low power consumption. The consumption of the whole device is less than 50uA.

◆PCB use high anti-corrosion, high water resistance, high impedance ESD conformal Coating

3. FAQ

1 Which current of the PCB should i choose?  

Take 13S 48V pack as an example: Which PCB you should choose depends on the power of your motor or the current limitation of your controller. Below 350W ,you can choose 16A.Below 500W, you can choose 18A, Below 800W, you can choose 35A,Below 1KW, you can choose 60A. Above 1200W, the same. If you are not sure, please contact us freely.

 

2 Can I use bigger size of PCB than it should?

Suppose you need 60A PCB but you chose 80A, that is OK.

80A allows higher current.Nothing bad but a bit higher price.

But if you choose 50A, sorry it is too small. So you can choose higher spec but can’t choose lower one than it should have been.

 

3 What kind of charger should i choose?

Lithium battery must be charged by lithium battery charger. You can’t charge it with a lead acid battery charger. The lead acid battery charger might damage MOS pipe of the PCB.

 

4 If i have PCB, do i need any balancers?

Yes if you can add QNBBM balancers, that would be perfect.

The Main function of PCB is to prevent batteries from over charged or over discharged,over heated etc.

All the PCB /BMS in the world balance performance is not satisfactory.

With balancers added, the batteries lifespan will be longer and the capacity will be fully used.

 

5 How to 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 each other or not.when the volt difference is 1V, the battery will have such performance:driving distance is short, cut off when started, charging time is very short.under such situation , some battery is defective. When the PCB is broken, the battery can’t be discharged when you measured the battery volt is normal.   

  

4.Technical parameter( for 3.2V rated Lifepo4 battery

 

Content

Spec

Unit

Remarks

Discharge

constant discharge current

120

A

 

peak discharge current

530

A

 

charge

charge voltage

14.4

V

 

charge current

120(MAX)

A

 

Over charge protection

over charge volt

3.65±0.025

V

 

over charge volt protect delay

0.5

S

 

Over charge volt release

3.6±0.05

V

 

Power balancing

 

Power balance volt

3.6

V

 

balance release volt

3.6

V

 

balance current

35

mA

 

Over discharge protection

Over discharge detect  volt

2.5±0.05

V

 

Over discharge detect delay

0.5

S

 

Over discharge volt release

3.0±0.05

V

 

Over  current protection

Over current detect volt

150

mV

 

Over current detect delay

9

MS

 

Over current protection

530

A

 

Over current protect release

disconnect load

 

 

Short circuit protection

Short circuit protection

 

External load short circuit

 

 

Short circuit detect delay

250

uS

 

Short circuit detect release

Disconnect load

 

 

Temperature

protection

Temp protection

none

Can be customized

resistance

Main circuit resistor

≤10

 

Self-

consumption

Working current

≤50

uA

 

Sleepy current(when battery is over discharged )

≤12

uA

 

Working temp

 

temp range

-30/+80

 

 

5. Product Photo

 

4S2

 

6. Wiring instruction

14S-25A-35A-45A-60A-PCM-PCB-BMS-for-48V-18650-LiNCM-Li-ion-lithium-battery_

Accessory Type: Battery Accessories
Brand Name: QNBBM
Model Number: DG4S120A
Application: LiFePO4 battery
battery series: 4S
over charge protection: yes
short circuit protection: yes
over discharge voltage: yes
with heat sink: yes
with temperature monitor: yes
charge port and discharge port: share the same one
constant charge current: 120A
Peak discharge current : 530A


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