Background
An EV component manufacturer was developing a battery pack for a commercial vehicle application involving repeated fast-charging cycles and sustained high-load operation, conditions more demanding than the thermal management approach used in the manufacturer’s existing passenger vehicle designs.
The Challenge
Existing passive and standard active cooling designs couldn’t maintain the battery pack within safe operating temperature during the combined fast-charging and sustained-load duty cycle, and it was unclear whether any cooling architecture could meet the requirement within the vehicle’s packaging and weight constraints.
Technological Uncertainty
It was not known in advance whether a cooling system could maintain safe cell temperatures under this specific duty cycle within the available packaging space, or what combination of coolant flow architecture and thermal interface design would be required.
Experimental Development
The team systematically tested multiple coolant flow architectures, thermal interface materials, and cell-spacing configurations, measuring peak cell temperature, thermal gradient across the pack, and cooling system power draw for each configuration under simulated duty-cycle conditions.
What Failed?
An initial serpentine coolant flow design maintained acceptable average temperature but produced a thermal gradient across the pack that exceeded cell balancing tolerances, requiring the team to redesign the flow path and cell arrangement.
Technological Advancement
The team developed a modified coolant flow architecture combined with a revised thermal interface configuration that maintained safe, balanced cell temperatures across the full duty cycle within the required packaging envelope, generating new thermal design knowledge specific to this application.
Potentially Relevant SR&ED Activities
● Systematic testing of coolant flow architectures and thermal interface configurations
● Peak temperature and thermal gradient benchmarking under simulated duty-cycle conditions
● Cooling system power draw analysis across configurations
What Would Generally Not Qualify
Manufacturing battery packs using the finalized, validated thermal management design for production vehicles would be routine manufacturing and would not itself qualify.
Documentation
Thermal test data across cooling configurations, packaging and weight analysis, and engineering notes explaining why standard cooling architectures were insufficient would support this claim.
