Multi-Battery Power System





When cars are in a highly demanding state, such as accelerating or braking hardly and quickly, the battery embedded in the car needs more energy capacity to sustain the vehicle. Existing battery packs in electric vehicles use only one type of battery. These battery packs in electric vehicles reach their end of life in 8-10 years, or when they reach 70% to 80% of their original capacity, making them expensive to replace. Vehicles in fleet also need to run continuously and can’t stop for long to charge.

Electric vehicles could benefit from a dual energy source: one battery to move the car as far as possible and another to accelerate it as quickly as needed. A vehicle also needs an energy source which can recharge fast enough and whose energy capacity doesn’t degrade too much with cycle life.

A student has interest in creating a novel, 2-battery pack system that can be implemented in fleet cars to achieve these goals. It shall be a commercial product that combines 2 batteries into one product for fast charging, longer lifetime, and reliable performance in cold climates.

Problem Statement

Help analyze and design an electrical processing unit intended for battery power management. This system consists of a 2-pack battery system that can be used in the fleet industry, one high-power and one high energy, to improve capacity and power distribution while the vehicle is under heavy charge or discharge.

Simulate and advise on electrical design for a 100 Watt-Hour system to be tested with a brushless DC motor.

Envisioned Solution

The intended solution is a hybrid battery system combining Lithium Titanae Oxide (LTO) with Nickel Manganese Cobalt (NMC), keeping the capacity of the combined pack the same at 60 kWh, and can accept charging power of 150 kW. The energy management system should have an algorithm that will determine a threshold below which only the energy battery provides power while above the threshold, as both energy and power batteries provide power.

There will be a great need for power-electronics engineers and electrical engineers to help design the energy management system, which will reduce stress levels in the battery.

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Project Rules

Challenge Rules

Applicants with a background in Power-Electronics engineering are needed. Individuals who work with high currents in electronic components (such as switches, controllers, etc.) will be essential.

Project Compensation Breakdown

Challenge Prize Breakdown

Submission 1: $250

Submission 2: $100

Submission 3: $100

Submission 4: $100

Becoming a permanent member on this product team to co-innovate with fellow engineers will also be a unique offering in addition to the prize money, for those who show encouraging work.


Stage 1:

Written plan for how the solution would work by executing a rule-based algorithm or an adaptive algorithm such as model Predictive Contorl (MPC), or Machine Learning to sustain the energy control management system that should cover the following:

  • Electrical circuits
  • Testing the software to see if the results match with the program being developed in MATLAB.
  • Energy Management Circuit – determine if electronically viable and works similar to the vehicle simulation design in MATLAB.


Stage 1:

Testing of batteries complete in lab, final testing with the energy management circuit required.


Please take a moment to review this project's terms and agreement.

Engineer Types



4 Weeks




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