EV Academy Kickoff: From Industry Insights to Battery Fundamentals

Introduction

The session opened with a warm welcome to over 900 participants. The host introduced the EV Academy’s vision, emphasizing the shift of electric vehicles (EVs) from purely mechanical machines to integrated systems of mechanical, electrical, electronic, and computer‑science components.

Program Overview

• Mentor: Mr. Punit K, a veteran with 6‑8 years in EV service and design, leads the technical tracks.
• Structure: Two weeks of daily online lectures followed by offline labs starting 16 Feb at VTU Nagari campus (with parallel facilities at VTU Bellagi). Accommodation is available for female students; male students can use nearby PGs.
• Delivery: Morning and afternoon sessions cover different topics; recordings are shared by end‑of‑day.

EV Industry Landscape

• Traditional ICE (internal combustion engine) brands (e.g., TVS, Bajaj, Mahindra, Honda, Royal Enfield) have existed for >30 years with limited competition.
• EV OEMs (Ather, Ola, TVS‑EV, Ultraviolette, Yulu, Ampere, etc.) largely emerged after 2019, creating a rapidly expanding market with many new entrants.
• Compared to ICE, EVs have far fewer core components—primarily battery, motor, controller, and charger—making design and maintenance simpler.

Battery Types Overview

Core Battery Parameters

• Nominal (platform) voltage: Typical values – Lead‑acid 2 V, Sodium 3 V, NMC 3.7 V, LFP 3.2 V.
• Full‑charge voltage: 4.2 V for NMC, 3.6‑3.7 V for LFP.
• Cut‑off (0 % SOC) voltage: ~3 V for Li‑ion cells.
• Capacity (Ah) & Energy (Wh): Ah = amp‑hours, Wh = V × Ah. Example: 3.75 V × 2.6 Ah ≈ 9.75 Wh.
• State of Charge (SOC): Calculated from cell voltage; 0 % ≈ 3 V, 50 % ≈ 3.6 V, 100 % ≈ 4.2 V.

Series & Parallel Configurations

• Parallel: Same voltage, currents add. Example: two 12 V 200 Ah batteries in parallel → 12 V 400 Ah.
• Series: Voltages add, current stays the same. Example: three 12 V 20 Ah cells in series → 36 V 20 Ah.
• Design Exercise: To obtain a 60 V 20 Ah pack using 12 V 20 Ah cells, connect five cells in series (no parallel needed).

Practical Calculations Demonstrated

1. Three‑cell series pack (4 V × 2.6 Ah each):
2. Total voltage = 12 V, total Ah = 2.6 Ah.
3. Three‑cell parallel pack (same cells):
4. Total voltage = 4 V, total Ah = 7.8 Ah.
5. SOC conversion: 0 % → 9 V (3 V per cell), 50 % → 10.8 V (3.6 V per cell), 100 % → 12.6 V (4.2 V per cell).
6. Charger selection: For the 12.6 V full‑charge pack, choose a charger rated ≥ 12.6 V.

Upcoming Hands‑On Sessions

• Evening labs will move from small‑scale packs to full‑scale EV battery packs, covering:
• Detailed series/parallel design
• Cell selection based on application (energy density, cycle life, cost)
• Integration of BMS, safety devices, and fast‑charging strategies
• Recorded sessions will be available for review.

Conclusion

The kickoff session equipped participants with a solid foundation in EV fundamentals, battery chemistry, and basic pack design principles, preparing them for deeper hands‑on work in the upcoming lab sessions.

Understanding battery chemistry, series‑parallel configurations, and SOC calculations is essential for designing reliable EV power packs; the EV Academy now provides the knowledge base and practical labs to turn this theory into real‑world solutions.