7.4V lithium battery protection board

Charge/discharge protection module or BMS or Battery Management System modules are used to protect and control the charge and discharge of Lithium-Ion/Polymer batteries. These modules are usually classified based on the amount of current and the number of battery cells they support. This protective module is a 4-cell lithium ion and lithium polymer battery charger with the ability to charge a maximum of 20 amps. The features of the battery protection board include: overcharge protection, overdischarge protection, short circuit protection, overcurrent protection.

This protection board cannot be used for lithium iron phosphate battery, hand drill battery pack, electric car battery pack, electric bicycle battery, 775 (4a) motor, led 1w fisheye lamp.

Note: One of the features of this charger is the Overcharge and Discharge protection circuit that prevents the battery from being damaged, in addition, the MOS transistor can control the charging and discharging of the battery.

B+ is connected to the positive pole of the battery

B- Connect to the negative pole of the battery

BM is connected to the connection point between battery 1 and battery 2

P+ is connected to the positive electrode of the charge/discharge terminal (common to the charge and discharge terminals).

P- connecting to the negative electrode of the charge/discharge terminal (common in charge and discharge terminals)

Note: When assembling the battery pack, the battery voltage, capacity and internal resistance must match. The battery voltage should be around the nominal voltage of 3.7 volts. After assembling the battery pack, there is no output, so only charge with 8.4V.

Circuits sensitive to voltage level

Charge control circuits

robotic

Electronic products

LED light backup power sources

Type: Voltage regulator

Dissipation power: 50 watts

Supply voltage: 8.4 volts

Application: 18650 lithium battery

Overcharge voltage range: 4.35v - 4.25 ±0.05V

Over discharge voltage range: 3.0v - 2.5 ±0.05V

Working current: 0-5A

Working temperature: -40 ~ +50 degrees Celsius

Instantaneous current: 6-7A

Storage conditions: -40 ~ +80 degrees Celsius

Off current: less than 5uA

Effective life: more than 50,000 hours

Internal resistance: less than 300mΩ