Categories
Contact Us

SHENZHEN SINOLI ELECTRONIC CO., LTD.

HQ Addr.:FLAT/RM 704 7/F, BRIGHT WAY TOWER, 33 MONG KOK ROAD, MONG KO,KL, HK

Office Addr.: No. 502, FL 5th, Blog A#, LingNan Creative Valley, ShiYan Street, BaoAn Distric, Shenzhen City

Factory Addr.: B# 5Fl, Ming Jinhai Group the First Industrial Park, Tangtou Road, Shiyan Town, Baoan District, Shenzhen city, Guangdong Province, China.

Landline: +86-755-6660-5507

Fax: +86-755-6660-5507

Whatsapp/Wechat: +8618665676364

E-mail: info@sinoli-batteries.com

Website: www.sinoli-batteries.com

Service Hotline
+86-755-6660-5507

News

Home > NewsContent

7.4v Lithium-ion Battery Pack Production Method

Shenzhen Sinoli Electronic Co.,Ltd | Updated: Dec 23, 2018

7.4v lithium-ion battery production, lithium-ion battery pack production method?


1,7.4V lithium-ion batteries


7.4V is the nominal voltage, the lowest voltage is 7V, and the highest voltage is 8.4V. The interior is composed of two lithium-ion batteries. The maximum voltage of a single lithium-ion battery is 4.2V and the minimum is 3.5V. If the voltage is lower than 3.5V, the battery will be discarded and cannot be charged, otherwise it will be dangerous. Likewise, a single lithium-ion battery can not charge more than 4.2V, otherwise it will be dangerous.


Therefore, a charger should be designed to ensure that a single lithium-ion battery does not exceed 4.2V, charging input, 12V power supply.


Detailed illustration of three classical 7.4v lithium-ion battery charging circuit diagrams (7.4v lithium-ion battery charging chip)


When charging, the red indicator lights up and the green indicator lights up after filling.


2. Circuit Design


Detailed illustration of three classical 7.4v lithium-ion battery charging circuit diagrams (7.4v lithium-ion battery charging chip)


3. Main Charging Chip: TP5100


Detailed illustration of three classical 7.4v lithium-ion battery charging circuit diagrams (7.4v lithium-ion battery charging chip)


This part of the circuit is designed to output 8.4V lithium-ion batteries for charging.


TP5100 is a dual 8.4V/single 4.2V lithium-ion battery charge management chip with switching buck.



TP5100 has a 5V-18V wide input voltage. The battery charging can be divided into three stages: trickle current pre-charging, constant current and constant voltage. The trickle current pre-charging current and constant current charging current are adjusted by external resistance, and the maximum charging current reaches 2A.


Three sections are connected in series, then eight sections are connected in series and parallel, using 2600 mAh Sanyo cores, 12.6V and 20A protective boards for protective boards. No problem with 2 to 3 years. If it helps you, please accept me, thank you for your support!!


Question:


Voltage requirement 14.8V, 4 sections should be connected in parallel. Which kind of protective board to buy?


Chasing and answering


Then 4 in parallel, 6 more strings, with 16.8V, 20A protective board can be used.


7.4V lithium-ion battery pack belongs to multi-series and parallel lithium-ion battery pack. It is widely used in notebook batteries, LED flashlights, digital cameras, mining lamps, medical equipment, emergency lights and other manufacturers. It can play a very good role in protecting electrical appliances.


High energy density, high voltage, pollution-free, lithium-free metal, high cycle life, no memory effect, fast charging.



Battery Composition: ICR18650-3S1P

Nominal voltage: 11.1V

Nominal capacity: 2200 mAh

Standard continuous discharge current: 0.2C

Maximum continuous discharge current: 1C

Working Temperature: Charging: 0-45 C

Discharge: - 20 ~ 60 C

Product size: MAX19*56*70.5mm

Finished product internal resistance: <320m_

Standard weight: 0.15kg

Protection board: IC-S8254AAF+MOS-AO4409

Lead model: JST-VHR-2P reverse UL1007/20#, length 200mm


Protection parameters:

Overcharge protection voltage/4.28+0.025V per string

Over-discharge protection voltage 2.4+0.1V

Overcurrent value: 10-17A