18650 battery li-ion rechargeable battery with protected board

18650 battery li-ion rechargeable battery with protected board 2200MAH guaranteed CE/ROSH

18650 battery li-ion rechargeable battery with protected board

*Item condition: original and brand new,Genuine guaranteed.*Standard Voltage: 3.6V-3.7V*Charge Voltage : 4.20+/-0.03V*Discharge Cut off Voltage: 3.0V*Height: 65.0+/-1.0mm (2.56in)*Reference Weight: 47g (1.66oz) Per cell*Length:65mm, Diameter:18mm*Standard Capacity: 2200mAh /min ~2300mAh

18650 battery introduce   

3.7V 18650 Li-ion battery is belong to rechargeable battery, the battery is put protect board and without protect board two kinds, 

We are always suppling high quality 18650 battery, new battery body, grade A quality, high capacity, long discharging time battery.

18650 li-ion rechargeable battery with protected board

genuine 2200MAH guaranteed without fake capacity

Free present --18650 charger (this is a extra free gift)

The functions of protect board

Over-charge protection

    The principle of over-charge protection IC is: In order to prevent to increasing of internal pressure caused by rise in temperature, require terminating the charging status, when an external charger to the rechargeable lithium batteries. At the same time, the IC need to test the battery voltage when voltage reaches 4.25V (assuming the battery over-charge point is 4.25V) that is activated over-charge protection, the power MOSFET to cut off by the opening and then closing charge.

    In addition, take attention to over-charge malfunction detection that due to generated by excessive noise, determined to avoid overcharge protection. Therefore, need to set the delay time and delay time can not be shorter than the duration of the noise.

 

Over-discharge protection

     In the case of over discharge, the function of battery goes deterioration caused by electrolyte decomposition, and result in reduced charge cycles. Li-ion battery protection IC can be avoided over-discharge to achieve the battery protection.

    The principle of over-discharge protection IC: In order to prevent over-discharge state, suppose lithium battery was connected to the load, when the voltage is lower than the over-discharge voltage test point (assumed it is 2.3V), IC will activate the over-discharge protection, make to the power MOSFET changed to cut off from the opening and closing discharge avoid battery over-discharge phenomenon, and will keep the battery at low quiescent current standby mode, then the current is 0.1μA.

     When the lithium battery connected to the charger, and then lithium battery voltage is higher than the over-discharge voltage, over-discharge protection be lifted. In addition, taking into account the pulse discharge conditions, over-discharge detection circuit was set with delay time in order to avoid malfunction.

 

Li-ion battery protection circuit

    Because lithium-ion battery is a kind of high energy density battery, it is difficult to ensure the safety. In the over-charge state, the energy surplus when the battery temperature raises, then the electrolyte will decompose and produce gas, so increased internal pressure cause spontaneous combustion or the risk of rupture; the contrary, in over-discharge state, the electrolyte decomposition will cause the Deterioration of characteristics and Durability of cell, thus reducing the number of charge cycles.

     Lithium-ion battery protection circuit is to ensure the security of the battery at the over-charging and over-discharging state, and to prevent characteristic deterioration. Lithium-ion battery protection circuit is constituted by protection IC and two pieces power MOSFET, in which protection IC monitors the battery voltage when there are over-charging and over-discharging state to switch to the power MOSFET with plug-in, to protect the battery. Protection IC''s functions are reflected in over-charge protection, over-discharge protection and over current / short circuit protection.

18650 battery li-ion rechargeable battery with protected board