Lws 4s 7A PCBA PCB Battery Management System LiFePO4 BMS for Ebike

• Customization: Available
• Battery Series: 3s, 4s Available
• Max Charge: 5A
• Model NO.: LWS-4S7A-030V1(4S)
• Operating Temperature: -20~+70ºC
• Delivery Time: 7-15 Days After Payment
• Sample: Available
• Usage: Lithium Ion/LiFePO4 Battery Packs, etc
• Certificate: ISO9001/ISO14001/CE/RoHS
• Application: Solar, Toy′s Battery Pack, Power Bank, Power Tool
• Testing Service: 100%E-Testing
• Transport Package: PP Bag, Carton
• Specification: L50*W20*T5mm
• Trademark: LWS
• Origin: China
• HS Code: 8536300000
• Production Capacity: 100000PCS/Month
• Package Size: 10.00cm * 5.00cm * 2.00cm
• Package Gross Weight: 1.000kg

Product Description

1. Product Description

About your products,just tell us the relative voltage/ cells/ current A or equipment etc,
We will help to recommend the most suitable products for you. 

Product Advantages:

• ^{Supply OEM/ODM and custom service}
• ^{High quality with smart balance function}
• ^{Wholesale price}
• ^{ISO9001/ISO14001/CE/ROHS certificates}
• Fast delivery
• ^{Green product}
• ^{One year warranty}
• ^{Excellent safety performance}
•  ^{Short circuit testing passed}
• ^{Overcharge testing passed}
• ^{Over discharge testing passed}
• ^{Original imported :IC from Japan,MOS from USA,Components from Sumsang.}
•  ^{1.2m drop testing passed}
• ^{100% testing} 
• ^{Support ODM & OEM services} 

 About the battery BMS/PCB/PCM

Function^{_: Detect and protect the battery from over-charge  ,over-dicharge, over-current short-circuit ,temperature detecting protection and auotmatically voltage balance function .}

^{Build with high end electronic components (High End IC and MOSFET ) ,simple structure design will let it have more stable quality working performance , Flexible application
( it can be used for less series battery by leaving some connection pins at empty status ),full set of protection measures let it works well without any infulence from external unexpected accidents.}
If you feel that this product does not meet your requirements, you can consult our staff, you can recommend or customize the lithium battery protection board you want.

• Description of application effect 

    (Battery Management System) BMS can extend battery life and make battery work safely.

 

     This model can be used for solar, LED lights, Emergency lights, Digital Equipment, etc.electric scooter,e-bike,tourisr
sightseeing vehicle,electric tricycle,low speed ev,emergrncy ups,solar street light,RV&home energy storage......

About your products,just tell us the relative voltage/cells/current A or equipment etc,we will help to recommend the most suitable products for you. 

4S 7A Lifepo4 battery packs bms printed circuit boards

Mode	LWS-4S7A-030V1 (4S)
PCM Size	L50*W20*T5 mm
battery series	4S Available
working current	7A Available
Application	LED lights, Emergency lights, Digital Equipment, etc
Sample	available

Wiring:
1. First connect the B- of the BMS to the total negative pole of the battery pack;

2.The cable starts from the thin black one connecting B-, the second red wire connects the positive pole of the first string of batteries, and the next string is connected in turn to positive pole of the battery,B-,B1,B2......B4; then insert the cable into the BMS; (The maximum number of strings is 4 strings, the example picture is 4 strings) (Please weld the wires in order and avoid pseudo solder joints.)  
3. Connect Charger C-/Load P- with BMS C-/P- (Use larger size wires) 
4. Connect Positive Pole: Charger C+/Load P+ with Battery Pack B+ (Use larger size wires) .

Shenzhen Li-ion Battery Bodyguard Technology Co.,LTD
PCM Specifications  For 12.8V (4S) LiFePO4 Battery Packs
Model:  LWS-4S7A-030V1 (4S)
No.	Test   item		Criterion
1	Voltage	Charging voltage	DC: 14.4V  CC/CV
		Single balanced voltage	3.6V±0.025V
2	Current	Balance current for single cell	36±10mA
		Current consumption	≤20uA
		Max continuous charging current	5A
		Max continuous Discharging current	5A
3	Over charge Protection	Overcharge detection voltage	3.90±0.025V
		Over charge detection delay time	0.5S-1.5S
		Over charge release voltage for single cell	3.80±0.05V
4	Over discharge protection	Over discharge detection voltage for single cell	2.30±0.08V
		Over discharge detection delay time	0.5S-1.5S
		Over discharge release voltage for single cell	2.70±0.10V
5	Over current protection	Over current detection voltage	200±25mv
		Over current detection current	10±3A
		Detection delay time	5-20mS
		Release condition	Cut load
6	Short protection	Detection condition	Exterior short circuit
		Detection delay time	200-500us
		Release condition	Cut Load
7	Resistance	Protection  circuitry(MOSFET)	≤50mΩ
8	Temperature	Operation temperature	-20~+60ºC
		Storge temperature	-20~+85ºC
		Temperature sensor	75ºC

3.FAQ
Q: How do I judge what material my battery is ?
A: Please take a look at the battery body.if the normal voltage of your battery shows as 3.2V,the battery will be LiFePo4.If the normal voltage of your battery shows as 3.6V or 3.7V, the battery will be Li-ion or Li-polymer battery. you can also ask battery manufacturer the material of battery.

Q: Can I use this protection circuit board for my battery?
A: Can use this protection circuit board, or not?
There are 2 questions:
How much cells in series is your battery pack?
The protection circuit board you need to buy must be same cells in series as your battery pack.

Q: What material is your battery?
A:Only the LiFePo4 battery has different electric parameter from other battery, so if you need buy the protection circuit board for LiFePo4 battery , Please let us know firstly.

Q: Do we need cell balance or not?
A: The function of balance : Since battery is made of many pcs of cells in parallel and in series, the cells can't be the same as no two people in the world is the same , so can only put in group with similar performance is not without balance function

Q: Do you have Minimum Order Requirement (MOQ)?
A: No, We don't have MOQ, Different customer have different requirement ,We can provide various capacity and size as per your requirements,Also ODM / OEM is welcome.

About your products, just tell us the relative voltage/ cells/ current A or equipment etc,we will help to recommend the most suitable products for you.