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Shem Kim

Shem Kim

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Goal

Constraints & Requirements

Safety

Thermal Safety

  • Batteries should remain within safe operating limits (No overtemp, over/under voltage, overcurrent)

  • Ensure all conducting material (current collectors, busbars) will operate within a safe temperature range

  • Mitigate likelihood of thermal run-away and thermal runaway propagation

  • Ensure driver safety in thermal runaway scenario

  • Battery system should be safe from water ingress for raining & wet conditions

  • Accidental shorts should not happen within the system

Mechanical Safety

  • Battery system should not be damaged or lead to driver harm in a crash scenario

  • Battery system should not be damaged from expected NVH (car vibration, sudden bumps)

Electrical Safety

  • Insulate and mark high voltage components to ensure operator safety during assembly and servicing

PerformanceEfficiency

Weight Reduction

  • Battery system weight should be minimized where possible through good material selection and mechanical design

  • MS16 target goal is 300kg (MS15 was 440kg), battery system should comply to help the car hit the target weight

Minimize Power Loss & Redundant Power Consumption

  • Minimize power needed for cooling

  • Minimize cell internal resistance, connections' contact resistance, and resistance from current collectors & busbars

Ensure Car Reliability by Meeting Set Timelines (Give Enough Time for Testing)Performance

  • Battery system should be meet necessary motor voltage and power requirements for cruising, overtaking, uphill driving

Vehicle Reliability

  • Battery manufacturing and assembly should be complete by early Winter 2026 so that testing can be complete by EOT. Spring 2026 is hands-off for mechanical, reserved for drive testing.

  • Entire system should be designed for DFM & DFA to minimize extra work added from hiccups and to meet timeline

Minimize Cost/Stay Within Budget

  • Keep costs down wherever we can (we got 1/2 the budget from WEEF for cells this year compared to MS15, and there are more design teams now than before)

Serviceability/Quality-of-Life

  • Reduce required serviceability time for module replacement and integration with mechanical & electrical systems.

  • Reduce possible instances where catastrophic servicing mistakes can happen. (i.e. situations where you might drop something that can damage aero, situations where you might drop something that can damage hardware boards)

  • Improve hardware accessibility for quick trouble-shooting. Aim for accessibility while operator is outside of the car.

  • Improve ergonomics related with servicing pack & battery hardware (somewhat of a nice-to-have, but keep in mind for design wherever we can)

Constraints & Requirements Relating to Other Sub-Teams

Electrical

  • Hardware constraint

    • Existing ICs may limit certain configurations

    • Certain designs will create a disproportionate amount of work for HW/FW

    • PCB Budget

Mechanical

  • Space claim constraint

  • Centre of gravity constraint

ASC Regulations

  • Will influence some of the above constraints & requirements

  • ASC regulations that don’t have much to do with what’s above:

    • Impounding regs

    • Battery security regs

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