We are Stier Racing, a student motorsports team from India, participating in Formula Bharat 2026 under the Formula Student Electric Vehicle (FSEV) category. Our team is designing and fabricating a high-performance electric race car from the ground up, and at the core of this car lies one of its most vital systems — the Accumulator Pack.

The accumulator is the main powerhouse of an EV, supplying electrical energy to the drivetrain via the motor controller. It is not only the heart of our electric vehicle but also one of the most critical, high-voltage components in terms of performance, safety, and reliability.

Our pack is built with the following configuration:

Module configuration: 5s15p

Total pack configuration: 20s15p

Each module consists of 75 cylindrical 21700 lithium-ion cells, precisely arranged in 5 cells in series and 15 in parallel. The cells are spot-welded using Nickel strips to ensure low-resistance, high-current interconnections, which is essential for peak performance and efficiency in an EV application.

To structurally and electrically secure these cells, we have designed custom cell holders, which are essential to:

• Prevent vibrations and mechanical stress on the cells
• Maintain correct spacing for thermal management
• Avoid short circuits due to cell movement
• Ensure safety during operation and charging

We require 2 CNC-machined holders for the production of the modules

We have chosen ABS – Flame Retardant as the material for these cell holders because of:

1. Its excellent mechanical strength and durability
2. Ease of machining and precise tolerances
3. Most importantly, its compliance with UL94 V-0 flame retardant rating, which is a requirement in Formula Student rulebooks to minimize fire hazards in high-voltage systems

We are seeking sponsorship support from PCBWay for the CNC machining of 2 cell holders. Your precision manufacturing and material capabilities will help us produce high-quality, regulation-compliant modules that meet Formula Bharat’s stringent technical standards.

In return for your support, we will proudly:

• Display PCBWay branding on our race car, pit booth, and uniforms
• Promote PCBWay on our social media handles, technical blogs, and during national-level events
• Acknowledge your contribution in our design reports and sponsor presentations

We’re excited to partner with PCBWay in pushing forward sustainable mobility innovation and building India's next generation of EV engineers!

— Team Stier Racing

• Cell Holder
• Cells
• Modules
• FSEV
• Battery