EV Heat Pump Coolant-Refrigerant Layout for Lower Energy Heating
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Solution Overview
Problem
Existing thermal management systems in electric vehicles face challenges with high costs and maintenance difficulties due to multiple fluid loops, particularly the refrigerant loop, and the use of electric heaters.
Innovation Solution
A simplified thermal management system incorporating a heat pump system with a refrigerant loop and coolant loop, controlled by a central module, which utilizes ambient environment or electric drive system heat sources for heating and cooling, and includes components like compressors, water pumps, three-way valves, and electric heaters to manage thermal comfort and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multiple fluid loop design is used for the refrigerant loop, then thermal management functionality is improved, but system complexity and maintenance difficulty increase
Solution Approach 1:
The patent merges the refrigerant loop and coolant loop into an integrated thermal management system where a single refrigerant circuit performs both cooling and heating functions. The heat pump assembly combines the compressor, condenser, expansion device, and evaporator into one unified unit that can operate in different modes (cooling mode and heating mode) to serve multiple thermal management needs, thereby reducing the number of separate fluid loops while maintaining versatile functionality.
2Adaptability or versatility
If a multiple fluid loop design is used for the refrigerant loop, then thermal management functionality is improved, but maintenance difficulty increases
Solution Approach 1:
By combining multiple fluid loops into a single integrated refrigerant loop with a unified heat pump assembly, the patent reduces the number of separate systems that require maintenance. The integrated design allows technicians to service one consolidated system rather than multiple independent loops, simplifying diagnostic procedures and reducing maintenance complexity while preserving full thermal management capabilities through the heat pump's multiple operating modes.
3Ease of operation
If electric heaters are used for cabin heating, then heating functionality is provided, but energy consumption increases
Solution Approach 1:
The patent converts waste heat from the powertrain components into a useful resource for cabin heating. The heat pump system captures thermal energy that would otherwise be lost and redirects it to heat the cabin, transforming a harmful waste product into a beneficial heating source. This approach provides effective heating functionality while significantly reducing energy consumption compared to using electric heaters alone, as it utilizes already-present thermal energy in the system.
4Ease of operation
If electric heaters are used for cabin heating, then heating functionality is provided, but cost increases
Solution Approach 1:
By capturing and utilizing waste heat from powertrain components through the heat pump system, the patent reduces the need for additional heating equipment and energy consumption. This conversion of waste heat into useful cabin heating lowers operational costs and reduces the need for expensive electric heater infrastructure, thereby reducing overall system cost while maintaining effective heating functionality.
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
The system reduces energy consumption, simplifies thermal architecture, and enhances maintenance by using a centralized control module to manage refrigerant and coolant flows, providing efficient heating, cooling, and dehumidification while extending battery life and improving cabin comfort.
Implementation Method 1
a compressor (101) in refrigerant fluid communication with only the water condenser (102)
Implementation Method 2
a water condenser (102) in refrigerant fluid communication with only the compressor (101) and the expansion valve (103)
Implementation Method 3
an expansion valve (103) in refrigerant fluid communication with only the water condenser (102) and the evaporator (104)
Implementation Method 4
an evaporator (104) in refrigerant fluid communication with only the expansion valve (103)
Implementation Method 5
the heat pump system under a heat pump mode uses the ambient environment or the electric drive system as the heat source to heat the battery
Implementation Method 6
The coolant loop includes two water pumps
Data Source
AI summary
A heat pump system includes a refrigerant loop and a coolant loop. The refrigerant loop includes a compressor, a water condenser, an expansion valve, and a chiller. The coolant loop includes two water pumps, a one-way valve, six three-way valves, a cabin cooler, a cabin heater, a battery pack, and an electric drive system. An electric heater is used to generate additional heat power for cabin heating. A fan and a blower are used to control the front end and cabin airflow. The heat pump system provides a simplified thermal design for electric vehicles while providing efficient thermal management of the cabin and the powertrain system.