EV Thermal Management with a Shared Heat Exchanger
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Solution Overview
Problem
Current electric vehicle thermal management systems are overly complex and inefficient, often requiring multiple independent heat management subsystems that increase costs and environmental impact due to fossil fuel combustion, while also failing to effectively provide on-demand heating and cooling.
Innovation Solution
A simplified thermal management system utilizing a single heat exchanger with interconnected coolant loops for the energy storage system, HVAC, and drive motor cooling subsystems, including a refrigeration subsystem with a compressor, condenser, and thermostatic expansion valve, and a power train cooling subsystem with a circulation pump and radiator, allowing for efficient heat transfer and temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple independent heat management subsystems are used, then each subsystem can be optimized for its specific function, but the overall system complexity increases and efficiency decreases
Solution Approach 1:
The patent combines multiple independent heat management subsystems (power train cooling, battery cooling, and HVAC) into a single integrated thermal management system that shares common components including the heat exchanger, coolant pump, and control unit. This merging reduces overall system complexity while maintaining the ability to independently manage thermal requirements of each subsystem through controlled coolant flow distribution.
Solution Approach 2:
The single heat exchanger serves multiple functions by simultaneously cooling the power train motor, cooling the battery pack, and providing heating or cooling to the HVAC system depending on operational conditions. The coolant loop is designed to route thermal energy to different destinations based on real-time thermal management needs, making the system universally applicable to multiple thermal control requirements.
2Adaptability or versatility
If multiple independent heat management subsystems with separate components are used, then each subsystem can operate independently, but the number of components (pumps, valves, refrigerant systems) increases
Solution Approach 1:
The patent consolidates multiple subsystem components into a shared infrastructure: a single electric coolant pump replaces multiple mechanical pumps, one heat exchanger replaces multiple separate cooling systems, and a unified control unit manages all thermal zones. This component sharing dramatically reduces the total quantity of parts while preserving independent operational capability through electronic control of coolant flow distribution.
Solution Approach 2:
The shared coolant loop and heat exchanger are designed to serve multiple subsystems simultaneously or independently based on control valve positioning and pump operation. The system can route coolant to the power train, battery, or HVAC system as needed, allowing one set of components to perform the work of what would traditionally require multiple separate systems.
3Loss of energy
If multiple heat transfer circuits sharing the same heat transfer medium are used, then thermal efficiency improves through heat exchange between circuits, but system complexity remains relatively high
Solution Approach 1:
The patent implements a single integrated coolant loop that circulates thermal energy among the power train, battery, and HVAC system through one heat exchanger and one pump, eliminating the need for multiple separate heat transfer circuits. The control system manages thermal exchange by directing coolant flow to different components based on real-time temperature and power demands, achieving thermal efficiency without the complexity of multiple independent circuits.
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
This solution provides a more efficient and cost-effective thermal management system that meets the power train and HVAC requirements of electric vehicles, reducing complexity and environmental impact by using a single heat exchanger and interconnected coolant loops to manage temperature across various subsystems.
Implementation Method 1
A refrigeration subsystem cools the heat exchanger
Implementation Method 2
A first coolant loop in thermal communication with the heat exchanger is used to cool the energy storage system
Data Source
AI summary
An efficient thermal management system (100) that utilizes a single heat exchanger (133) is provided. A refrigeration subsystem (103) cools the heat exchanger (133). A first coolant loop (139) in thermal communication with the heat exchanger (133) is used to cool the energy storage system (137). A second coolant loop (151) corresponding to the HVAC subsystem (107) is also in thermal communication with the heat exchanger (133). Preferably a third coolant loop (109) corresponding to the drive motor cooling subsystem (101) is coupleable to the HVAC coolant loop (151), thus providing an efficient means of providing heat to the HVAC subsystem (107).