How to Use Type-C USB 2-3S BMS 15W: Examples, Pinouts, and Specs

The Type-C USB 2-3S BMS 15W is a compact and efficient Battery Management System (BMS) designed for managing 2-3 cell lithium battery packs. It features a Type-C USB interface for charging and data transfer, making it highly versatile and user-friendly. This component ensures safe and reliable operation of lithium battery packs by providing overcharge, over-discharge, and short-circuit protection.

• Power banks and portable chargers
• Lithium battery-powered devices
• DIY electronics projects
• Robotics and IoT applications
• Backup power systems

• Input Voltage (via Type-C USB): 5V DC
• Output Voltage (Battery Pack): 7.4V-12.6V (depending on the number of cells)
• Maximum Charging Current: 3A
• Power Rating: 15W
• Battery Configuration: 2S (7.4V) or 3S (11.1V) lithium battery packs
• Protection Features:
  • Overcharge protection
  • Over-discharge protection
  • Short-circuit protection
  • Overcurrent protection
• Operating Temperature Range: -20°C to 60°C
• Dimensions: 50mm x 20mm x 5mm (approx.)

The Type-C USB 2-3S BMS 15W has the following key connections:

1. Connect the Battery Pack:
   • For a 2S battery pack, connect the positive terminal to B+, the negative terminal to B-, and the middle connection to BM.
   • For a 3S battery pack, connect the positive terminal to B+, the negative terminal to B-, and the intermediate connections to BM as required.
2. Connect the Load:
   • Attach the load (e.g., a motor or circuit) to the P+ and P- terminals.
3. Charging:
   • Use a Type-C USB cable to connect the BMS to a 5V power source for charging.
   • The LED indicators will show the charging status.
4. Ensure Proper Ventilation:
   • Place the BMS in a well-ventilated area to prevent overheating during operation.

• Battery Compatibility: Ensure the lithium battery pack is compatible with the 2S or 3S configuration.
• Avoid Overloading: Do not exceed the 15W power rating or 3A charging current.
• Secure Connections: Use proper connectors or soldering to ensure stable and secure connections.
• Monitor Temperature: Avoid using the BMS in environments exceeding the specified temperature range.
• Polarity Check: Double-check the polarity of all connections to prevent damage to the BMS or battery pack.

If you are using the BMS to power an Arduino UNO, you can monitor the battery voltage using the following code:

// Arduino code to monitor battery voltage using an analog pin
const int batteryPin = A0; // Connect the battery's positive terminal to A0 via a voltage divider
float voltage = 0.0;

void setup() {
  Serial.begin(9600); // Initialize serial communication
  pinMode(batteryPin, INPUT); // Set the battery pin as input
}

void loop() {
  int sensorValue = analogRead(batteryPin); // Read the analog value
  voltage = sensorValue * (5.0 / 1023.0) * 3; 
  // Convert the analog value to voltage. Adjust the multiplier based on
  // the voltage divider ratio used in your circuit.
  
  Serial.print("Battery Voltage: ");
  Serial.print(voltage);
  Serial.println(" V");
  
  delay(1000); // Wait for 1 second before the next reading
}

Note: Use a voltage divider circuit to step down the battery voltage to a safe range (0-5V) for the Arduino's analog input pins.

1. BMS Not Charging the Battery:

   • Cause: Incorrect wiring or damaged battery pack.
   • Solution: Verify all connections and ensure the battery pack is functional.

2. Overheating During Operation:

   • Cause: Exceeding the power rating or poor ventilation.
   • Solution: Reduce the load or improve ventilation around the BMS.

3. LED Indicators Not Working:

   • Cause: Faulty LEDs or insufficient input power.
   • Solution: Check the input power source and inspect the LED connections.

4. Load Not Receiving Power:

   • Cause: Faulty connections or triggered protection circuit.
   • Solution: Check the P+ and P- connections and reset the BMS by disconnecting and reconnecting the battery.

• Can I use this BMS with a 1S battery pack?

  • No, this BMS is specifically designed for 2S or 3S lithium battery packs.

• What happens if I connect the battery pack with reversed polarity?

  • The BMS may be damaged. Always double-check the polarity before connecting.

• Can I use a higher voltage input for charging?

  • No, the Type-C USB input is designed for 5V DC only. Using a higher voltage may damage the BMS.

• How do I know when the battery is fully charged?

  • The LED indicator will show a "fully charged" status when the battery reaches its maximum voltage.

By following this documentation, you can safely and effectively use the Type-C USB 2-3S BMS 15W in your projects.