2S BMS Protection Circuits

 

Hello; We would compile for you the uses of 2S BMS Battery protection circuits and all the information you should pay attention to when using them. We wish you pleasant reading.

 

 

 

What is Battery Management System or BMS?

 

 

 

Battery Management System – 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 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 situations due to their high internal resistance and high self-discharge levels. Most of the time there is no need for protection other than a fuse.

 

 

 

However, while closed-type Lead Acid (SLA) Batteries, Valve Regulated Lead Acid (VRLA) Batteries and Nickel Metal Hydride (Ni-MH) batteries provide higher efficiency, they are more vulnerable to overvoltage, undervoltage, overcurrent and extreme temperature conditions. It is therefore important to monitor these batteries for 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 may be damaged, they can often overcome short-term disturbances and regulate themselves. On the other hand, lithium batteries are very intolerant in terms of voltage & temperature limits. For example, even if the maximum charging voltage of an SLA, VRLA, or Ni-MH cell is exceeded by 100 millivolts, the cell will self-discharge, release some heat, and possibly continue operating 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, heating up and eventually breaking down.

 

 

 

The Battery Management System is generally responsible for MAINTAINING the safe conditions of the battery. Since each battery type 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 Saver", takes the battery's cell voltages and battery current and compares them to predefined limits. Any exceedance results in battery disconnection. This function is usually provided by simple analog comparator integrated circuits. Disconnection It can be easily achieved using a MOSFET group.

 

 

 

Battery Protectors are used in widespread application areas, 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 Savers 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 battery's state of charge (SOC) and state of health (SOH)

Presenting battery information through a communication interface

 

 

 

2S 3A 7.4V Lithium Battery BMS Protection Board

 

 

Suitable for 7.4V 18650 battery.

The battery does not charge. It is for battery protection.

It takes on the task of balancing.

 

 

 

 

 

Lithium battery protection board features:

 

 

Model: HX-2S-02

Overcharge voltage protection range:0.05V±4.25-4.35V

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

Instantaneous current: 5A Storage conditions: -40 - + 80 ° C

Working current: 3A Working temperature: -40 - + 50 ° C

Stand by current: less than 3uA effective life: more than 50,000 hours

Internal resistance: less than 45m Short circuit protection: protection, charge recovery

Charging voltage: 8.4V-9V

Size: 36*6*2.0mm

 

 

 

 

Port description:

 

 

 

B + : connected to the positive pole of the battery;

B - : connected to the negative pole of the battery;

BM: connection point between battery 1 and battery 2

P + : charge / discharge terminal positive (combined charge / discharge terminal);

P - : charge / discharge terminal negative ( common terminal / discharge terminal)

 

 

 

 

 

 

You can click on the link to buy the product.

https://www.elektronikport.com/urun/2s-7-4v-3a-bms-koruma-karti-lityum-batarya-18650-li-ion-lipo-protection-module

 

 

 

 

 

2S 4A 7.4V Lithium Battery BMS Protection Board

 

 

 

High precision voltage detection function for each battery;

3 overcurrent detection functions;

Wide operating temperature range: -40°C ~ +85°C;

Low current consumption

Thanks to the MOS tube, it can control battery charging and discharging;

 

 

 

 

 

 

 

FEATURES:

 

1. Charging voltage: DC 9V CC/CV (MAX: 12V)

 

 

 

2. Current

Single current consumption (consumption) ≤6uA

Maximum continuous discharge current: 4A

 

 

 

3. Overcharge protection

Overcharge detection voltage: 4.29V Accuracy ≤ ± 0.025V

Overcharge detection delay time: 1s

Overcharge recovery voltage: 4.05V Accuracy ≤ ± 0.025V

 

 

 

4. Over-discharge protection

Over-discharge detection voltage: 3V Accuracy ≤ ± 0.1V

Over-discharge detection delay time: 128ms

Over-discharge recovery voltage: 3.2V Rect.

29.06.2024