Circuit Documentation

Summary

This circuit is designed to manage and utilize a series of 18650 Li-ion batteries connected through a Battery Management System (BMS) to provide a stable 5V output. The BMS ensures the batteries are charged and discharged safely, while the connector provides the necessary output voltage for external devices.

Component List

1. 18650 Li-ion Battery

   • Description: Rechargeable lithium-ion battery.
   • Pins: +, -
   • Purpose: Provides power to the circuit.

2. BMS 4S 40A

   • Description: Battery Management System for 4-series Li-ion batteries.
   • Pins: 12.4 V, 0V, 4.2 V, 16.8 V, +V, -V, 8.4 V
   • Purpose: Manages charging and discharging of the batteries.

3. Connector 5V

   • Description: Connector providing 5V output.
   • Pins: GND, VCC
   • Purpose: Provides a stable 5V output for external devices.

4. Comment

   • Description: Placeholder for comments.
   • Pins: None
   • Purpose: Used for documentation and notes within the circuit design.

Wiring Details

18650 Li-ion Battery

• Battery 1

  • - connected to 0V of BMS
  • + connected to 4.2 V of BMS

• Battery 2

  • - connected to 0V of BMS
  • + connected to 4.2 V of BMS

• Battery 3

  • - connected to 0V of BMS
  • + connected to 4.2 V of BMS

• Battery 4

  • - connected to 4.2 V of BMS
  • + connected to 8.4 V of BMS

• Battery 5

  • - connected to 4.2 V of BMS
  • + connected to 8.4 V of BMS

• Battery 6

  • - connected to 8.4 V of BMS
  • + connected to 12.4 V of BMS

• Battery 7

  • - connected to 8.4 V of BMS
  • + connected to 12.4 V of BMS

• Battery 8

  • - connected to 12.4 V of BMS
  • + connected to 16.8 V of BMS

• Battery 9

  • - connected to 12.4 V of BMS
  • + connected to 16.8 V of BMS

• Battery 10

  • - connected to 16.8 V of BMS
  • + connected to 16.8 V of BMS

• Battery 11

  • - connected to 16.8 V of BMS
  • + connected to 16.8 V of BMS

• Battery 12

  • - connected to 16.8 V of BMS
  • + connected to 16.8 V of BMS

BMS 4S 40A

• 0V connected to - of Battery 1, Battery 2, and Battery 3
• 4.2 V connected to + of Battery 1, Battery 2, and Battery 3, and - of Battery 4 and Battery 5
• 8.4 V connected to + of Battery 4 and Battery 5, and - of Battery 6 and Battery 7
• 12.4 V connected to + of Battery 6 and Battery 7, and - of Battery 8 and Battery 9
• 16.8 V connected to + of Battery 8 and Battery 9, and + of Battery 10, Battery 11, and Battery 12
• -V connected to GND of Connector 5V
• +V connected to VCC of Connector 5V

Connector 5V

• GND connected to -V of BMS
• VCC connected to +V of BMS

Code

There is no microcontroller code provided for this circuit.