3S4S5S6S7S8S120A Smart Lithium Battery Protection Board: Redefine
high energy efficiency and safety
"Give the battery a guardian that never tires"
3S-8S 120A household lithium battery protection board | Safe and
silent for ten years
"The balcony at 3 a.m."
Father frowned beside the old electric tricycle:
"The battery can't be charged again... I have to deliver vegetables
to the market tomorrow morning."
"The next morning"
Daughter handed over a new battery box with a protection board:
"Dad, this time it will accompany you to withstand 3,000 sunrises."
—— We believe that the warmth of technology is to make important
people no longer worry
Core Value
"It is more afraid of battery damage than you are"
When overcharged, it is like a mother protecting a hot pot: "Stop!
It's full!"
When short-circuited, it is like a father repairing a fuse: "With
me here, sparks can't run wild!"
"Batteries quarrel? It will be the peacemaker"
Are the voltages of the 7 cells uneven? Quietly "cooking special
dishes" for the weak and "stepping on the brakes" for the strong
Result: The whole family goes out with all the electricity in
order, just like the slippers you put in place
"Time can't steal the youth of the battery"
Ordinary batteries decay by 30% in one year, but the batteries it
manages can still say "I can still do it!" after 5 years
(Actual test: with balancing function, cycle life ≥ 2000 times)
Family protection moment
Sending children to the emergency room on a rainy night
The electric car ran wildly in the rain, and the protection board
silently pressed the overcurrent: "Go steadily, don't cut off the
power."
Grandpa's fishing energy storage box
The sun by the lake was baked to 50℃, and the protection board
started the "cool heart" mode: "High temperature? I block it!"
The store's freezer backup power supply
The power outage on the typhoon day, the protection board gritted
its teeth and held on for 8 hours: "The ice cream didn't melt, it
must be done!"
Son's remote control racing car
The child reversed the wires and smoked, and the protection board
instantly shut down: "Don't be afraid, Dad can't fix it, I'll save
it."
"Its heart is like a Swiss watch"
120A high current = Power 10 air conditioners at the same time
without taking a breath
Seven-layer protection = 7 layers of bulletproof vests for the
battery, bullets from "overcharge" to "reverse connection" are
fully protected
20℃ cold resistance = more resistant to freezing than polar bears,
electric vehicles can be turned on in winter
User testimonials
Auto repair shop Lao Zhang:
"The board installed last year, jumping around every day to repair
cars for others, and never entered my shop!"
Teacher Sister Li:
"I used to be afraid that the battery would catch fire, but now I
dare to sleep when charging at night. It is more reassuring than an
anti-theft door."
"Old battery + protection board = 3 more years! Throw away one less
battery and reduce the burden on the earth by 10 kilograms."
Long-term commitment (tree-shaped timeline design)
"10 years of a sapling"
Year 1: accompany you to start a business and deliver goods, zero
battery maintenance
Year 3: Children use it to learn circuit knowledge, "Dad, is this
board the class teacher of the battery?"
Year 10: The retired battery box is hung in the garage, and the
protection board still has a green light: "Stand by at any time."
Technical Parameters
| | Item type | Parameters |
| 1 | Parameter Overview | Product Model | EK-BM3R8S120A |
| Product Size(mm) | L95*W68*T15 |
| Product Weight(kg) | 0.25 |
| Product Material | FR-4 / Lead-free spray tin |
| Applicable battery type | Lifepo4 | Li-ion | Lto | SIB |
| Applicable battery string | 3S-8S | 3S-8S | 3S-8S | 3S-8S |
| Rated discharge current | 120A | 120A | 120A | 120A |
| Peak starting current | 300A | 300A | 300A | 300A |
| | Item type | Trigger
(time) | Trigger
(time) | Trigger
(time) | Trigger
(time) | Trigger
(time) | Trigger
(time) | Trigger
(time) | Trigger
(time) |
| 2 | Charging protection | Overvoltage protection voltage value | 3.65V/1S | 3.50V/1S | 4.25V/1S | 4.05V/1S | 2.85V/1S | 2.75V/1S | 3.95V/1S | 3.80V/1S |
| Balanced phase difference voltage value | Trigger voltage difference 30mV / trigger time 0.5S / balance time
10S cycle |
| Balanced voltage value | 3.45V | 3.70V | 2.50V | 3.10V |
| Overcurrent value | 120A/2S, disconnect charger to recover |
| Low temperature value | Charge over-temperature protection 60℃/2S / Release 55℃/2S |
| Overtemperature value | Charging low temperature protection -5℃/2S / Release 0℃/2S |
| 3 | Discharge protection | Undervoltage protection voltage value | 2.30V/1S | 2.70V/1S | 2.75V/1S | 3.0V/1S | 1.70V/1S | 1.80V/1S | 1.50V/1S | 2.00V/1S |
| ①Overcurrent protection value | 150A/2S, disconnect load or activate charging |
| ②Overcurrent protection value | 250A/0.5S, disconnect load or activate charging |
| Short circuit protection value | 500A/128uS, disconnect load or charge activated |
| Low temperature value | Discharge over-temperature protection 65℃/2S, release 60℃/2S |
| Overtemperature value | Discharge low temperature protection -20℃/2S, release -10℃/2S |
| 4 | Others | Standby current consumption | 25uA |
| Motherboard lock voltage | / |
Size $ Packing List
Package included:
1 * BMS with heatsink
1 * NTC Terminal Cable
1 * Switch Cable
1 * Terminal Cable
6 * Terminal Lugs
6 * M5 Screws
Wire Diagram
Wiring precautions:
1. Installing the protective board requires a certain amount of
technical electronic knowledge.
2. When wiring, first connect the B- wire at the soldering pad
position to the total negative terminal of the battery (the B- wire
should be soldered to a short and thick wire) and solder the wired
terminal to the battery pack first, and then insert the protective
plate.
3. The connection between the battery terminal B- and the
protection board terminal B- should be short and thick, otherwise
it will cause the protection board to charge and discharge in
advance and malfunction.
4. You need to use thick wires when wiring P+/P-. Wires that are
too thin and too long will burn the board!
FAQ
Q1. Why did we choose you?
* We can provide you with efficient after-sales service, with more
than 10 years of strong technical support.
* Products have passed FCC, CE, ROHS and other international
standards certification.
* We can provide you with factory price, Welcome you to visit our
factory and production process.
Q2. What is your product range (type)?
*We mainly do battery management systems in the fields of power
batteries, energy storage batteries and consumer batteries.
*Mainly used for LFP, Li-ino and LTO batteries.
Q3: How do I know which kind of material & type my battery is ?
*Please look the battery body, If the normal voltage of your
battery shows 3.2V, The battery is LiFePo4.
*If the normal voltage of your battery shows 3.6V or 3.7V, the
battery is Li-ion or Lto battery.
Q4. Do you have minimum order requirements?
Can it be customized? What is the lead time for samples and
batches?
*Our minimum order quantity is 1 piece, ODM customization is
available.
* 1~3 days delivery of existing samples, 3~10 days delivery of
customized samples.
Q5: What if i can't use it?
*Regular products have instructional videos, We can also support
online video call guidance from engineers.
Q6. What are your terms of payment?
*We accept wire transfer and cash payment, all negotiable. Payment
method :visa, mastercard, T/T, PayPal, APPLE_PAY, GOOGLE_PAY,
GC_REAL_TIME_BANK_TRANSFER, RMB
Q7. How do you guarantee the quality?
* All our products are subjected to professional laboratory 100%
testing, as well as repeated aging tests.
* Obtained FCC, CE, ROHS and other international standard
certification.
* Provide 3 years after-sales warranty service. Free spare units
for replace in 3 years.
Q8. How to choose a BMS suitable for our battery?
*Depending on the voltage and current that matches your battery,
you can consult our customer service and we will provide it for you
equipped with the most suitable battery management system.
Q9. How can i contact you?
*We have 7x24 hours online service, Please leave us a message
online.
*You can also contact us by Email, WhatsApp, WeChat, etc(see
below). We are so glad to work with you.
Noted: We are source manufacturer, We have own brand for "EnerKey",We can customized product as your requirement(Voltage, Wire,Etc) .
We can provide you competitive price in the market if you have bulk
order, Please don't hesitate to contact us.
Mobile & WhatsApp & Wechat: +86 15387469240; Email: kiwi@enerkey.cn
