EV Multi-Voltage Charging Controller with Thermal Feedback
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Solution Overview
Problem
Existing energy storage management systems for electric vehicles optimize charging based solely on state-of-charge and voltage, neglecting factors like device lifespan and temperature limits, which can lead to premature device failure and increased lifecycle costs.
Innovation Solution
A multiport energy management system with a controller that receives sensor feedback from high and low voltage storage devices, compares it to operating limits, determines optimal charging currents and power splits, and regulates power accordingly to balance recharge time with device longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If charging is optimized based solely on state-of-charge and voltage, then charging efficiency is improved, but device lifespan deteriorates
Solution Approach 1:
The system implements comprehensive feedback control by continuously monitoring multiple parameters including state-of-charge, voltage, temperature, and device lifespan indicators. The controller adjusts charging parameters in real-time based on feedback from all these sources, preventing overcharging and thermal runaway while optimizing charging speed, thus resolving the contradiction between charging efficiency and device lifespan
Solution Approach 2:
The charging strategy dynamically adapts based on real-time system conditions. The controller modifies charging current and voltage profiles according to changing temperature, state-of-charge, and device health status, enabling the system to optimize charging efficiency at each moment while preventing conditions that would reduce device lifespan
2Productivity
If charging current is increased to reduce recharge time, then productivity is improved, but device temperature increases leading to potential failure
Solution Approach 1:
The system employs periodic monitoring and adjustment of charging parameters. The controller periodically checks temperature sensors and adjusts charging current accordingly, enabling intensive charging when temperatures are acceptable while preventing thermal buildup, thus achieving fast charging without excessive temperature increase
Solution Approach 2:
The system takes preliminary anti-action by implementing predictive temperature management. Before temperature reaches critical levels, the controller proactively reduces charging current or activates cooling systems based on temperature trends and thermal models, preventing thermal runaway while maintaining optimal charging speed during safe operating conditions
Data Source
AI summary
An electric vehicle includes a controller configured to receive sensor feedback from a high voltage storage device and from a low voltage storage device, compare the sensor feedback to operating limits of the respective high and low voltage storage device, determine, based on the comparison a total charging current to the high voltage storage device and to the low voltage storage device and a power split factor of the total charging current to the high voltage device and to the low voltage device, and regulate the total power to the low voltage storage device and the high voltage storage device based on the determination.