1s BMS

What is a Battery Management System or BMS?

Battery Management System (BMS) is the battery’s safety system and is responsible for keeping battery conditions (such as voltage, current & temperature) within safe limits.

The level of protection depends on both the requirements of the battery’s chemistry and the complexity of the BMS itself. Batteries with primitive chemistries such as lead acid and nickel cadmium are resistant to overcurrent and overvoltage conditions due to their high internal resistance and high self-discharge levels. In most cases, no protection other than a fuse is needed.

However, Sealed Lead Acid (SLA) Batteries, Valve Regulated Lead Acid (VRLA) Batteries and Nickel Metal Hydride (Ni-MH) batteries are more efficient but less tolerant to overvoltage, undervoltage, overcurrent and overtemperature conditions. Therefore, it is important to monitor these batteries for the specified conditions during operation.

Battery Management System in Lithium-Ion Batteries

Lithium-based batteries are much more sensitive to operating conditions than all other batteries. Although the other batteries described can be damaged, they can often overcome short-term violations and regulate themselves. On the other hand, lithium batteries are very intolerant in terms of voltage & temperature limits. For example, even if the maximum charge voltage of an SLA, VRLA or Ni-MH cell is exceeded by 100 millivolts, the cell will discharge itself, release some heat and probably continue to operate with a small loss of capacity. If the same amount of overcharging is attempted in a lithium cell, the cell will undergo a destructive reaction, heat up and eventually break down.

The Battery Management System is generally responsible for MAINTAINING the safe conditions of the battery. Since each type of battery has different limits and tolerances, battery management systems must comply with the same limits and tolerances.

Battery Protectors

The simplest form of BMS, also known as a "Battery Protector", takes the battery cell voltages and battery current and compares them to predefined limits. Any overshoot results in the battery being disconnected. This function is usually provided by simple analog comparator integrated circuits. Disconnection can be easily achieved using a MOSFET group.

Battery Protectors are used in a wide range of applications from small household appliances and hand tools to small vehicles such as electric bicycles and electric scooters. The main function of this type of Battery Protector is to provide the basic conditions for battery protection, but they cannot provide the most critical features listed below.

Balancing cells to the same charge level
Calculating the state of charge (SOC) and state of health (SOH) of the battery
Providing battery information through a communication interface

1S 3A Lithium Battery BMS Protection Card

Suitable for 3.7V 18650 battery

Battery does not charge. For battery protection

Balance function

 

 

Features:

Overcharge voltage: 4.25 ± 0.05V

Overcharge voltage: 4.23 ± 0.05V

Overdischarge voltage: 2.54 ± 0.1V

Maximum continuous charge current: 2A

Maximum continuous discharge current: 2A

Overcurrent protection: 3A

Size: 40mm x 4mm x 3mm

1S 4A li-ion BMS Protection Board

Features:

Overcharge detection voltage: 0.05V ± 4.25V

Overcharge release voltage: 0.05V ± 4.23V

Overdischarge detection voltage: 0.1V ± 2.45V

Upper limit continuous current: 4A

Over-current detection current: 5A

Charging voltage: 4.2V

Product Size: 35*4*2.2MM

IC components: DW01+8205A*2

 

Main function: Overcharge protection, over-discharge protection, short circuit protection, over-current protection

 

 

Wiring instructions:

B+: Connected to the battery positive.

B-: Connected battery negative.

P+: For battery pack output input positive

P-: For battery pack output input negative

 

 

 

1S 5A Lithium Battery BMS Protection Board

Applicable to series 1 cell, 5A and lithium/cobalt acid lithium/lithium cobalt/lithium/lithium polymer/triple battery pack.

 

 

Suitable for 3.7V 18650 battery.

 

It acts as a balance.

 

 

 

 

Specification

 

 

 

Overcharge voltage: 0.05V ± 4.25V

Overcharge release voltage: 0.05V ± 4.23V

Overdischarge voltage: 1V ± 2.54V

Maximum continuous charge/discharge current: 5A

Maximum discharge current: 5A

Weight: 10g

 

 

1S 12A Lithium Battery BMS Balance Board

 

 

Mode: HXYP-1S-4012A

Size: 40*12*3.5mm

S 15A 3.7V BMS Protection

 

Suitable for 3.7V 18650 Li-ion battery.

Does not charge battery.

For battery protection.

FEATURES:

Charging Voltage: 4.2V (Voltage to be applied from the charger)
Overcharge voltage: 0.05V ± 4.25V

Overcharge voltage: 0.05V ± 4.23V

Overdischarge voltage: 0.1V ± 2.54V

Maximum continuous charge current: 15A
Maximum continuous discharge current: 2A
Overcurrent protection: 3A

Pin connections:

B + : Battery + connection pin
B - : Battery - connection pin
P +

29.01.2025