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Smart Lead-Acid / Li-ion Battery Charger with CC-CV Profile

Approx. component budget: Rs. 5,000 - 9,000

Objective

Charge a small battery using a proper CC-CV profile and compare charging time and heating with a simple fixed-voltage charger.

What you will build

A buck-type charger with current and voltage control, a microcontroller implementing the constant-current then constant-voltage profile, temperature sensing, a display and a protection stage.

Results you can expect

• Charge curves for both chargers
• Charging time
• Battery temperature
• Energy efficiency
• End-of-charge detection accuracy

What you will learn

Battery charging methods and protection, buck converters and microcontroller control.

Tools and notes

Arduino/ESP32, INA219, MOSFET, battery holder, Excel. Use a low-capacity battery, a fuse and a fire-safe tray, and never leave the charge unattended.

Resume points from this project

• Built and tested Smart Lead-Acid / Li-ion Battery Charger with CC-CV Profile; objective: charge a small battery using a proper CC-CV profile and compare charging time and heating with a simple fixed-voltage charger.
• Measured and analysed charge curves for both chargers and charging time; wrote the report and presented the results in a viva. Add your own numbers: [x].

Replace [x] with your own measured results. Write only what you really did.

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