3 Series 20A 18650 Lithium Battery Protection Board

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Component Description

Overview

The 3 Series 20A 18650 Lithium Battery Protection Board is a microcontroller-based lithium-ion/lithium-polymer battery protection module designed to ensure safe and reliable operation of 18650 battery packs. This protection board is designed to prevent overcharge, over-discharge, over-current, and short-circuit conditions, thereby extending the lifespan of the battery and preventing potential safety hazards.

Functionality

Overcharge Protection: Prevents the battery from being charged beyond its maximum rated voltage, thereby preventing damage to the battery and reducing the risk of explosion or fire.
Over-Discharge Protection: Prevents the battery from being discharged below its minimum rated voltage, thereby preventing damage to the battery and ensuring reliable operation.
Over-Current Protection: Limits the maximum current that can be drawn from the battery, thereby preventing excessive heat generation and reducing the risk of fire or explosion.
Short-Circuit Protection: Detects and interrupts short-circuit conditions, thereby preventing damage to the battery and other components.

The 3 Series 20A 18650 Lithium Battery Protection Board provides comprehensive protection for 18650 lithium-ion batteries by monitoring and controlling the following parameters

Key Features

High-Precision Voltage Detection: The module features high-precision voltage detection with an accuracy of 1% to ensure accurate monitoring of the battery's state of charge.
Adjustable Parameters: The module allows for adjustable overcharge and over-discharge voltage thresholds, as well as over-current limits, to accommodate different battery types and applications.
High-Speed Switching: The module features high-speed switching (less than 1s) to minimize power losses and ensure rapid response to fault conditions.
Low Quiescent Current: The module's low quiescent current (less than 5A) minimizes unnecessary power consumption and prolongs battery life.
Compact Design: The module's compact design (36.5mm x 15.5mm x 3.5mm) makes it suitable for use in a wide range of applications, including portable electronics, electric vehicles, and renewable energy systems.
Multiple Protection Modes: The module supports multiple protection modes, including overcharge, over-discharge, over-current, and short-circuit protection, to ensure comprehensive protection of the battery.
Compatible with 18650 Batteries: The module is specifically designed for use with 18650 lithium-ion batteries, making it an ideal solution for a wide range of applications.

Technical Specifications

Operating Voltage

3.0V to 4.2V

Quiescent Current

Switching Frequency

100kHz

Maximum Current

20A

Overcharge Protection Voltage

4.2V 1%

Over-Discharge Protection Voltage	2.5V 1%
Over-Current Protection Threshold	20A 1%
Short-Circuit Detection Time	1s

Operating Temperature

-40C to 85C

Applications

Portable electronics (e.g., laptops, smartphones, tablets)
Electric vehicles (e.g., e-bikes, electric scooters)
Renewable energy systems (e.g., solar-powered charging systems)
Power tools and equipment
Medical devices and equipment

The 3 Series 20A 18650 Lithium Battery Protection Board is suitable for use in a wide range of applications, including

Conclusion

The 3 Series 20A 18650 Lithium Battery Protection Board is a reliable and efficient solution for ensuring the safe and reliable operation of 18650 lithium-ion batteries. With its high-precision voltage detection, adjustable parameters, and multiple protection modes, this module is an ideal choice for a wide range of applications.

Pin Configuration

3 Series 20A 18650 Lithium Battery Protection Board Pinout Documentation
The 3 Series 20A 18650 Lithium Battery Protection Board is designed to protect lithium-ion batteries from overcharge, over-discharge, over-current, and short-circuit conditions. The board consists of 6 pins, each serving a specific purpose. Here's a detailed explanation of each pin:
Pinout Structure:
Pin 1: B- (Battery Negative)
+ Function: Connect to the negative terminal of the 18650 lithium-ion battery.
+ Description: This pin is responsible for monitoring the battery's voltage and current.
Pin 2: P- (Power Negative)
+ Function: Connect to the negative terminal of the load or device being powered.
+ Description: This pin provides a protected power path to the load.
Pin 3: P+ (Power Positive)
+ Function: Connect to the positive terminal of the load or device being powered.
+ Description: This pin provides a protected power path to the load.
Pin 4: B+ (Battery Positive)
+ Function: Connect to the positive terminal of the 18650 lithium-ion battery.
+ Description: This pin is responsible for monitoring the battery's voltage and current.
Pin 5: SMBUS/DATA (Optional)
+ Function: Connect to a microcontroller or other device for monitoring battery status and balance charging (optional).
+ Description: This pin provides a serial communication interface for monitoring and controlling the battery protection board. (Note: This pin is optional and not always used.)
Pin 6: NC (No Connection)
+ Function: Not connected internally.
+ Description: This pin is not connected to any internal circuitry and should not be used.
Connection Structure:
To connect the pins correctly, follow this structure:
1. Connect the 18650 lithium-ion battery to the protection board:
B- (Pin 1) to the battery's negative terminal.
B+ (Pin 4) to the battery's positive terminal.
2. Connect the load or device to the protection board:
P- (Pin 2) to the load's negative terminal.
P+ (Pin 3) to the load's positive terminal.
3. (Optional) Connect a microcontroller or other device for monitoring and control:
SMBUS/DATA (Pin 5) to the microcontroller's serial communication interface.
Important Notes:
Ensure correct polarity when connecting the battery and load to the protection board.
The SMBUS/DATA pin is optional and only required for advanced monitoring and control applications.
The NC pin should not be connected to any circuitry.
By following this pinout documentation, you can properly connect the 3 Series 20A 18650 Lithium Battery Protection Board to your lithium-ion battery and load, ensuring safe and protected operation.

Code Examples

3 Series 20A 18650 Lithium Battery Protection Board Documentation

Overview

The 3 Series 20A 18650 Lithium Battery Protection Board is a highly integrated circuit designed to protect 18650 lithium-ion batteries from overcharge, over-discharge, over-current, and short-circuit conditions. This board is suitable for a wide range of applications, including battery-powered devices, e-bikes, and electric vehicles.

Key Features

3-Series protection (overcharge, over-discharge, over-current)
 20A continuous discharge current
 Suitable for 1-4S 18650 lithium-ion batteries
 Integrated overcharge and over-discharge protection IC
 Built-in short-circuit protection
 Low power consumption

Pinout

VCC: Power input (3.7V-4.2V)
 B+: Battery positive terminal
 B-: Battery negative terminal
 OUT+: Output positive terminal
 OUT-: Output negative terminal
 Balancing wires (optional): For balancing multiple batteries in series

Code Examples

### Example 1: Basic Battery Protection using Arduino

In this example, we'll use the 3 Series 20A 18650 Lithium Battery Protection Board with an Arduino board to monitor the battery voltage and prevent overcharge and over-discharge conditions.
```c++
const int battVoltagePin = A0;  // Battery voltage monitoring pin
const int protectionEnablePin = 2;  // Protection enable pin (active low)

void setup() {
  pinMode(protectionEnablePin, OUTPUT);
  digitalWrite(protectionEnablePin, HIGH);  // Enable protection
  Serial.begin(9600);
}

void loop() {
  int battVoltage = analogRead(battVoltagePin);
  float voltage = battVoltage  5.0 / 1024.0;
  Serial.print("Battery Voltage: ");
  Serial.println(voltage);

if (voltage > 4.2) {
    // Overcharge protection: Disable output
    digitalWrite(protectionEnablePin, LOW);
    Serial.println("Overcharge detected! Output disabled.");
  } else if (voltage < 3.7) {
    // Over-discharge protection: Disable output
    digitalWrite(protectionEnablePin, LOW);
    Serial.println("Over-discharge detected! Output disabled.");
  } else {
    // Normal operation: Enable output
    digitalWrite(protectionEnablePin, HIGH);
  }
  delay(1000);
}
```
### Example 2: Battery Monitoring with Raspberry Pi (Python)

In this example, we'll use the 3 Series 20A 18650 Lithium Battery Protection Board with a Raspberry Pi to monitor the battery voltage and current using Python.
```python
import RPi.GPIO as GPIO
import time

# Set up GPIO pins
GPIO.setmode(GPIO.BCM)
protEnablePin = 17  # Protection enable pin (active low)
currSensePin = 23  # Current sensing pin

# Set up protection enable pin
GPIO.setup(protEnablePin, GPIO.OUT)
GPIO.output(protEnablePin, GPIO.HIGH)  # Enable protection

while True:
    # Read current sensing pin (0-3.3V)
    currSenseValue = GPIO.input(currSensePin)
    current = currSenseValue  3.3 / 1024.0

# Read battery voltage (0-3.3V)
    battVoltageValue = GPIO.input(battVoltagePin)
    voltage = battVoltageValue  3.3 / 1024.0

print("Battery Voltage: {:.2f}V, Current: {:.2f}A".format(voltage, current))

if voltage > 4.2:
        # Overcharge protection: Disable output
        GPIO.output(protEnablePin, GPIO.LOW)
        print("Overcharge detected! Output disabled.")
    elif voltage < 3.7:
        # Over-discharge protection: Disable output
        GPIO.output(protEnablePin, GPIO.LOW)
        print("Over-discharge detected! Output disabled.")
    else:
        # Normal operation: Enable output
        GPIO.output(protEnablePin, GPIO.HIGH)

time.sleep(1)
```
Please note that these examples are for illustration purposes only and may require additional circuitry and programming to accommodate specific application requirements. Always follow proper safety precautions when working with lithium-ion batteries and electrical circuits.