Traction Battery Fast Charging Rate Control for Aging Cost Tradeoffs
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Solution Overview
Problem
Existing electric vehicle charging systems do not effectively manage the cost of charging based on varying DC fast charge rates, leading to inefficient charging practices that do not consider battery aging.
Innovation Solution
A vehicle control system that automatically selects a DC fast charge rate based on an aging parameter for the traction battery, ensuring the total cost of charging, including power, user time, and battery aging costs, remains below a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If DC fast charging is performed at higher charge rates, then charging speed is improved, but battery aging increases and cost per unit time increases
Solution Approach 1:
The system dynamically adjusts the charging rate based on real-time battery state parameters (temperature, charge level, aging threshold) rather than maintaining a fixed high charging rate. The controller monitors battery conditions and adapts the charge rate accordingly, allowing high-speed charging when conditions permit and reducing rate when aging risks increase
Solution Approach 2:
The system changes the charging parameter (charge rate) based on battery state parameters. By monitoring temperature, charge level, and aging thresholds, the system adjusts the charging rate parameter to optimize between speed and battery health, selecting from multiple available charge rates at different cost levels
2Loss of time
If DC fast charging is performed at higher charge rates, then charging time is reduced, but total cost increases
Solution Approach 1:
The system dynamically selects charging rates based on real-time conditions and cost parameters. Rather than always using the fastest (most expensive) rate, the controller adjusts the charge rate according to battery state and cost considerations, optimizing the balance between charging time and total cost
Solution Approach 2:
The system changes the charging rate parameter based on cost parameters and battery state. By selecting from multiple charge rates with different cost per unit time, the system optimizes the total cost while still meeting charging requirements within acceptable timeframes
Data Source
AI summary
A controller, responsive to a request to DC fast charge a traction battery at a charge station that offers a plurality of DC fast charge rates each with a cost per unit time that increases as the rate increases, generates output, only for each of the rates that correspond to an aging parameter for the traction battery that is less than a threshold value, indicating a cost to charge the traction battery at the rate.