Integrated EV Thermal Loop for Cabin and Battery Heat Management
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Solution Overview
Problem
Electric vehicles face challenges in managing heat generated by batteries and electrical components, which affects their performance and battery life, and there is a need to improve cooling and heating systems to enhance energy efficiency and extend battery usage time.
Innovation Solution
A heat management system incorporating a refrigerant circulation line with a compressor, water-cooled and air-cooled condensers, expansion valves, and a refrigerant heat exchanger, along with a cooling line that circulates cooling water to cool batteries and electrical components, while also providing heating through a heating line, optimizing the flow and switching valves to manage different operational modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a refrigerant compressor is driven for indoor air conditioning, then cooling performance is improved, but battery power consumption increases
Solution Approach 1:
The patent combines the air conditioning cooling system and the battery thermal management system into a single integrated heat management system. The refrigerant circulation line is used for both indoor cooling and battery cooling, allowing the system to share the compressor and refrigerant flow between two functions, thereby reducing overall power consumption while maintaining both cooling performance.
Solution Approach 2:
The refrigerant circulation line is designed to serve multiple purposes: it provides indoor air conditioning cooling through the evaporator and simultaneously cools the battery through the battery cooling line. This multi-functional design allows the same refrigerant system to handle both thermal management needs, improving energy efficiency.
2Temperature
If cooling performance of heat exchanger is increased to cool driving motor, then motor temperature control is improved, but system complexity increases
Solution Approach 1:
The patent integrates the driving motor cooling function into the existing refrigerant circulation system by adding a heat exchanger that utilizes the refrigerant. This approach combines multiple cooling needs (indoor air conditioning, battery cooling, and motor cooling) into a single unified system, avoiding the complexity of separate cooling systems for each component.
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 effectively manages heat, improves cooling and heating performance, and extends battery usage time by reducing power consumption, ensuring efficient operation across various temperature ranges.
Implementation Method 1
a refrigerant heat exchanger 233 for mutually exchanging heat between refrigerant flowing into the second expansion valve 240 and refrigerant discharged from the evaporator 242
Implementation Method 2
a water-cooled condenser 220
Implementation Method 3
a water-cooled condenser 220
Implementation Method 4
an evaporator 242
Implementation Method 5
an evaporator 242
Implementation Method 6
a cooling line 302 that cools a battery 350 and an electrical component 460 by circulating air or the cooling water heat-exchanged with the refrigerant
Data Source
AI summary
A heat management system includes a refrigerant circulation line for circulating refrigerant, the refrigerant circulation line comprising a compressor, a water-cooled condenser, a first expansion valve, an air-cooled condenser, a second expansion valve, an evaporator, a refrigerant heat exchanger for causing mutual heat exchange between refrigerant introduced into the second expansion valve and refrigerant discharged from the evaporator, and a first refrigerant bypass line configured such that refrigerant that has passed through the water-cooled condenser bypasses the first expansion valve and the air-cooled condenser; a heating line for heating the indoor space by circulating cooling water that exchanges heat with the refrigerant through the water-cooled condenser; and a cooling line for cooling a battery and electronic equipment components by circulating the cooling water that exchanges heat with the refrigerant or air.