Summary of "Embedded Systems and Design & Development - Feb 11, 2026 | Morning | VisionAstraa EV Academy"

Session overview

Summary of Embedded Systems & EV Design, VisionAstraa EV Academy Date: Feb 11, 2026 (morning)

High-level takeaways:

Program introductions, career guidance and soft-skills emphasis by Yadu.
Technical battery/BMS/charger design exercise led by Punit (live design of a 50 kW HV battery pack using 100 Ah NMC cells).
Practical project structure and administrative/logistics notes (online + optional offline/project phases, short reports).

Introduction, program context and careers (speaker: Yadu)

Vishnra (Vishnavi) EV Academy: multidisciplinary EV training focused on real-world skills (electrical/electronics + mechanical).
Founder background: electronics engineer (Intel, 17 years), VLSI experience; founded the academy to bridge gaps between academic syllabus and industry needs.
Internship structure and logistics:
- Online lectures with optional offline/project phases.
- In-person support available in Bangalore and Belgavi.
- Projects are optional; recommended group size ≤ 6.
- Final project reports short (≈ 6–8 pages).
Career & placement advice:
- Many Indian EV companies hiring across disciplines (mechanical, electrical, electronics, process, sales, operations).
- CGPA is not a strict barrier; attitude and communication are very important.
Professional development recommendations:
- Update LinkedIn (show “Intern at Vishnra Academy”), connect with instructors.
- Build soft skills, create visibility (social media, field visits), and network.
Hiring qualities discussed:
- Key attributes: attitude, skill, ability, knowledge, communication, confidence, problem solving, adaptability, hard/smart work, influence.
- Emphasis on attitude:
  
  “Your attitude determines your altitude.”
Practical program notes: 10–15 experiments/projects planned; sessions include theory, hands-on, and project mentoring.

Technical battery / BMS / charger design (speaker: Punit)

Recap of previous topics: sockets, battery pack types, onboard vs offboard charging, charger and BMS selection calculations.
Live design exercise: a step-by-step design of a 50 kW high-voltage (HV) battery pack using 100 Ah NMC cells. Instructor demonstrated assumptions, calculations, and component selection.

Detailed methodology (step-by-step procedure used in the exercise)

Decide pack architecture / nominal pack voltage
- For an HV pack the course uses a 300 V nominal architecture.
Compute required pack capacity in Ah from power
- Formula: Ah_required = Power_nominal (W) / Voltage_nominal (V).
- Example: 50,000 W / 300 V = 166.67 Ah → round up to a practical configuration.
Match Ah requirement to available cell capacity (determine parallels P)
- With 100 Ah cells you must use integer parallels.
- Example: round 166.67 Ah up to 200 Ah → P = 200 Ah / 100 Ah = 2 parallels (2P).
Compute number of series cells S
- Formula: S = Pack_nominal_voltage / Cell_nominal_voltage.
- Example with cell nominal voltage 3.7 V: S = 300 / 3.7 ≈ 81 series cells.
Calculate pack extremes (full-charge/max voltage and cutoff/min voltage)
- Use cell datasheet values (NMC example: full‑charge ≈ 4.2 V, cutoff ≈ 3.0 V).
- Pack max voltage = S × cell FVC → 81 × 4.2 ≈ 340.2 V → rounded ≈ 341 V.
- Pack min voltage = S × cutoff → 81 × 3.0 = 243 V.
Select assumed C‑rates (if datasheet not available) for preliminary sizing
- Typical class assumptions: discharge ≈ 3C, charging ≈ 0.2C (onboard).
Compute maximum discharge and charge currents
- Max discharge current = C_discharge × pack_Ah (e.g., 3 × 200 Ah = 600 A).
- Max onboard charge current = C_charge × pack_Ah (e.g., 0.2 × 200 Ah = 40 A).
BMS selection criteria (what the BMS must support)
- Number of series (S) and corresponding pack nominal/full/cutoff voltages.
- Maximum continuous and peak discharge currents (e.g., 600 A).
- Maximum continuous and allowed charge currents (onboard and pulse/fast-charge).
- Support for onboard charging and offboard fast charging inputs (if applicable).
- Communication interfaces and signal thresholds to the vehicle controller.
- Thermal monitoring, balancing, cell monitoring and safety features.
Offboard (fast) charger compatibility
- If offboard charger rating is known (e.g., 60 kW), compute charging current: I = P / V_nominal → 60,000 / 300 ≈ 200 A.
- Verify BMS and pack hardware can handle this pulse/fast-charge current; check cell manufacturer’s pulse charge limits.
Onboard charger sizing and ratings (use nominal voltage for “rated” power) - Rated onboard power: P_rated = V_nominal × I_onboard. - Example: 300 V × 40 A = 12 kW (rated). At full-charge voltage the instantaneous power is slightly higher: 341 V × 40 A ≈ 13.6 kW. - Distinguish between battery pack nominal capacity (50 kW), charger rating, and charger maximum output at full-charge voltage.
Charging time estimation (to be covered in a later session) - Compute time to charge using charger power vs usable pack energy, accounting for inefficiencies (to be calculated in follow-up session).

Key numbers and assumptions used (quick reference)

Pack nominal power: 50 kW
Nominal pack voltage: 300 V
Cell type: NMC — nominal 3.7 V, full-charge 4.2 V, cutoff 3.0 V
Cell capacity: 100 Ah

Resulting pack sizing (class example):

Required Ah ≈ 166.7 Ah → rounded to 200 Ah practical → P = 2
Series S ≈ 81 cells
Pack arrangement: 81S × 2P (81 in series, 2 in parallel)
Max pack voltage (full) ≈ 341 V; min (cutoff) ≈ 243 V
Assumed C-rates: discharge 3C → max discharge current ≈ 600 A; onboard charge 0.2C → 40 A
Onboard charger rated power (nominal) = 300 V × 40 A = 12 kW (max instantaneous at full-charge V ≈ 13.6 kW)
Offboard charger example: 60 kW → charging current ≈ 200 A

Practical notes, clarifications and advice (from the session)

Use nominal values for rated power calculations and nameplate ratings; use full-charge voltages when discussing maximum instantaneous outputs.
Battery capacity and charger capacity are distinct: a 50 kW pack can be charged by different charger powers — charging time depends on charger power and usable energy.
Prefer manufacturer-specified C-rates and pulse charge limits when datasheets are available instead of assumptions.
Configure BMS to communicate limits for both onboard and offboard charging scenarios.
Typical project workflow: theory → hands-on → optional projects → short final reports (6–8 pages, similar to a short paper/abstract).

Administrative / logistics and soft-skills emphasis

Update LinkedIn with internship details (“Intern at Vishnra Academy” or similar) and connect with instructors.
Attitude and communication are critical for hiring: be humble, presentable, and able to explain fundamentals simply.
Build visibility through field visits, content creation, and networking — this helps create influence and opens opportunities.
Program delivery: online lectures continue; offline sessions and labs available as options; projects optional and supported.

Speakers / sources

Yadu (Yadu/Yedu Jatawan / Yadu Jadedan) — co‑founder / chairman, Vishnavi (Vishnra) Academy — introductions, program context, career advice and soft-skills guidance.
Punit (Punit — Instructor; referred to as Punit Gun in handover) — led the technical battery/BMS/charger design exercise and calculations.

(Other mentioned people: Nikil/Nikl — co‑founder/CEO; Vadraj/Vadra, Aayush — admin/contacts; many student commenters; several company names referenced for placements.)