How much voltage should be used to charge a 3.7V lithium battery?

Generally, a 3.7V lithium battery needs to have a "protection circuit board" for overcharging and overdischarging. If the battery does not have a protection circuit board, it can only be charged with a voltage of about 4.2V, because the ideal full charge voltage of a lithium battery is 4.2V. If the voltage is exceed 4.2V,  the battery may is damaged, it is necessary to monitor the condition of the battery at the same time when charging with this method.

How to charge the 3.7V lithium battery


With the protection circuit board, you can use 5V to charge (4.8V to 5.2V can be used), the USB 5V charger of the computer or the 5V charger of the mobile phone can be used.

3.7V battery, charge cut-off voltage 4.2V, discharge cut-off voltage is 3.0V. Therefore, when the open circuit voltage of the battery is lower than 3.6V, it should be able to charge. It is best to use 4.2V constant voltage charging mode, you don't need to pay attention to the charging time. Charging with 5V is prone to danger of overcharging.

The usual lithium battery cell is 3.7V, the voltage is 4.2V when fully charged, and the nominal voltage after series connection is 7.4V, 11.1V, 14.8V...The corresponding full voltage (that is, the charger is no-load The output voltage) is 8.4V, 12.6V, 16.8V...

How to charge the 3.7V lithium battery?


Lithium batteries are most afraid of overcharging and overdischarging. Its charging needs to be divided into four processes: activation charging, constant current charging, constant voltage charging and trickle charging.

Activation charging: When the voltage is too low, a smaller current is required to activate and charge the lithium battery.

Constant current charging: After the voltage rises, it can be changed to constant current fast charging.

Constant voltage charging: When the voltage rises to 4.2V, it needs to be changed to 4.2V constant voltage charging, and the charging current gradually decreases.

Trickle charge: After fully charged, change to trickle charge to maintain the full charge of the lithium battery.

 

 

 

Shenzhen HuaYou Electronic Technology Co., Ltd


lipo battery manufacturer telephonel   TEL: +86-755-84822012
lipo battery manufacturer telephonel   TEL: +86-19902919902


E-mail of lipo battery manufacturer   Email: contact@hypolymer-cell.com

E-mail of lipo battery manufacturer   Email: sales01@hypolymer-cell.com

E-mail of lipo battery manufacturer   Email: ivywang@hypoly-cell.com


skype of lipo battery manufacturer  Skype: ivy.wang1982


adresse of lipo battery manufacutrer   Office Address：Building C1, Bantian International Center, BanTian Street, Longgang area, Shenzhen City, China

adresse of lipo battery manufacutrer   Factory Address 1: Luoma Second Bridge, Tiansheng Lake Villager Group, Luoma Village, QingXi Town, DongGuan, China

adresse of lipo battery manufacutrer   Factory Address 2: Building 41, Zhongnan HighTech Rongzhi Chuangmei Industrial Valley, Siqian Town, Xinhui District, Jiangmen City, Guangdong, China

 

         Site:  www.hypolymer-cell.com/

Comments

Post a Comment

Popular posts from this blog

What is the material of lithium battery separator?

Image
Lithium-ion battery separator , in the structure of lithium battery, the separator is one of the key inner components. For the lithium battery series, since the electrolyte is an organic solvent system, a diaphragm material resistant to organic solvents is required, and a high-strength thin-film polyolefin porous film is generally used. 1. Performance of lithium-ion battery separator products Since the performance of the lithium-ion battery separator determines the key characteristics of the lithium-ion battery, such as capacity, cycle performance , and charge-discharge current density, the separator is required to have appropriate thickness, ion transmission rate, pore size and porosity, and sufficient chemical stability. performance, thermal stability and mechanical stability. Lithium-ion battery separator has a large number of zigzag through micropores, which can ensure the free passage of electrolyte ions to form a charge-discharge circuit; when the battery is overch...
Read more

How many years is the life of a ternary lithium battery?

Image
Ternary lithium battery, also known as ternary lithium polymer , refers to a lithium battery with nickel-cobalt manganate or nickel-cobalt aluminate as the positive electrode material. Ternary lithium batteries are widely used in new energy vehicles due to their smaller size, higher capacity density, and low temperature resistance. The service life of the ternary lithium battery is calculated according to the ratio of the capacity decay degree after use to a certain extent, and it will be terminated directly until the capacity life is zero. The industry algorithm is generally that the ternary lithium battery is fully charged and then discharged once, which is called the cycle life. The theoretical life of a lithium battery is 1200 times that of full charge and discharge, that is, the full cycle life . According to the frequency of use, charge and discharge once every three days, charge and discharge 120 times a year, and the service life of the ternary lithium battery reac...
Read more

Precautions for charging, maintaining and using lithium batteries of lithium electric vehicles

Image
The number of kilometers that a lithium battery electric vehicle can run on a full charge is mainly related to the capacity of the lithium battery configured, and also has something to do with the method of use and the quality of the lithium battery. Let's learn more about the lithium battery charging instructions, maintenance and use precautions of lithium electric vehicles! Lithium electric vehicle charging instructions 1. Place and recharge: the battery pack has some remaining power before leaving the factory, and it can also be used for short-distance riding after the electric bike is sold. After the first ride, the battery must be charged for the first time, and it is recommended that the first charge should take a little longer (8-12 hours). The battery pack should be charged in time after use and cannot be stored at a loss of power. If the battery has not been used for more than two months, the battery pack needs to be fully charged once. If the battery pack...
Read more