Off-Board EV Battery Cooling System for Rapid Charging
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Solution Overview
Problem
Current on-board thermal management systems in electric vehicles are inadequate for rapid charging, leading to increased weight, cost, and volume due to the need for high-powered pumps and large heat exchangers, which cannot efficiently handle high heat dissipation during fast recharging.
Innovation Solution
An off-board temperature management system that provides coolant at a higher flow rate than on-board systems, using an off-board coolant source to cool the battery during recharging and circulating it at a lower rate on-board after recharging, determining the optimal coolant type and flow rate based on vehicle parameters to ensure efficient heat transfer and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If on-board thermal management systems use high-powered pumps and large heat exchangers to handle rapid charging heat dissipation, then cooling capacity is improved, but vehicle weight increases
Solution Approach 1:
The patent extracts the high-powered pump and large heat exchanger components from the vehicle's on-board system and relocates them to an off-board charging station. This allows the vehicle to receive high-capacity cooling during rapid charging without carrying the heavy equipment, thus improving cooling capacity while reducing vehicle weight.
2Temperature
If on-board thermal management systems use high-powered pumps and large heat exchangers to handle rapid charging heat dissipation, then cooling capacity is improved, but system cost increases
Solution Approach 1:
The patent extracts the expensive high-powered pump and large heat exchanger components from the vehicle's on-board system and relocates them to an off-board charging station. This allows the vehicle to receive high-capacity cooling during rapid charging without carrying the heavy equipment, thus improving cooling capacity while reducing vehicle weight.
3Temperature
If on-board thermal management systems use high-powered pumps and large heat exchangers to handle rapid charging heat dissipation, then cooling capacity is improved, but vehicle volume increases
Solution Approach 1:
The patent extracts the large heat exchanger and pump components from the vehicle's on-board system and relocates them to an off-board charging station. This allows the vehicle to receive high-capacity cooling during rapid charging without carrying the bulky equipment, thus improving cooling capacity while reducing vehicle volume.
4Productivity
If off-board coolant source provides coolant at high flow rate during recharging, then heat dissipation efficiency is improved, but on-board coolant loop flow rate must be increased
Solution Approach 1:
The patent segments the cooling system into two distinct loops: an off-board coolant source that provides high flow rate cooling during recharging, and an on-board coolant loop that operates at lower flow rate after recharging. This segmentation allows each loop to be optimized for its specific operating condition, improving overall heat dissipation efficiency without requiring the on-board system to handle excessive flow rates continuously.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables faster recharging rates without the need for heavy, costly on-board cooling systems, reducing vehicle weight and cost, while maintaining safety through efficient heat management and potential waste heat recovery.
Implementation Method 1
determining a convective heat transfer coefficient for removing the heat released by the electric battery during the recharging
Data Source
AI summary
A method of providing coolant to an electric battery for powering a drive train of an electric vehicle is provided. The method includes providing coolant from a coolant source off-board the electric vehicle at a first rate to cool the electric battery during recharging of the electric battery; and circulating coolant through a coolant loop on-board the electric vehicle at a second rate less than the first rate to cool the electric battery after the recharging of the electric battery.