Fuel Cell Coolant Loop With PCM for Faster Cold Starts
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Solution Overview
Problem
Fuel cell systems face challenges in cold-start performance, requiring complex and heavy thermal management systems with many valves, leading to prolonged startup times and reduced stack output due to rapid coolant temperature increases.
Innovation Solution
A thermal management system for fuel cell vehicles incorporating a coolant heater, phase change material (PCM), and a radiator, with a control method that utilizes the PCM to store and distribute heat efficiently, reducing startup time and simplifying the coolant loop while minimizing valve count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex thermal management system with many valves is used to secure cold-start performance, then cold-start capability is improved, but system complexity and weight increase
Solution Approach 1:
The patent merges the cold-start heating function and coolant circulation control into a single integrated coolant loop configuration. The coolant heater works in conjunction with the pump and existing valves to provide cold-start capability without requiring separate dedicated components, thereby reducing overall system complexity while maintaining reliability
Solution Approach 2:
The system performs preliminary heating action through the coolant heater before the fuel cell stack reaches optimal operating temperature. This preliminary action ensures cold-start capability is achieved without requiring complex real-time control systems, as the heating function is activated in advance based on temperature sensor feedback
2Reliability
If a complex thermal management system with many valves is used to secure cold-start performance, then cold-start capability is improved, but system weight increases
Solution Approach 1:
The patent combines multiple functions into existing components rather than adding separate weighted components. The coolant heater integrates with the coolant loop, and control functions utilize existing valves and sensors, avoiding the need for additional heavy mechanical parts while maintaining cold-start performance
3Temperature
If coolant temperature increases rapidly, then heating efficiency is improved, but stack output is reduced due to reaching temperature limit
Solution Approach 1:
The system dynamically adjusts coolant flow rate and heater power based on real-time temperature feedback from sensors. The control unit modulates pump speed and heater output to maintain optimal temperature progression, preventing the coolant from reaching temperature limits too quickly while ensuring efficient heating during cold-start conditions
Solution Approach 2:
Temperature sensors continuously monitor coolant temperature and provide feedback to the control unit, which adjusts heating and circulation in real-time. This feedback mechanism prevents overheating and ensures the stack operates within optimal temperature ranges, maintaining productivity while achieving efficient heating
4Device complexity
If the coolant loop is simplified, then system complexity is reduced, but cold-start performance may be compromised
Solution Approach 1:
The simplified coolant loop is designed with multi-functional components that perform multiple roles. The coolant heater serves both cold-start heating and normal operation temperature maintenance, while the single pump and valve configuration handles both cold-start and steady-state circulation, eliminating the need for complex dedicated cold-start loops
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 enhances cold-start performance, delays coolant temperature limit reach, and minimizes output limitations by effectively managing heat through the PCM and radiator, reducing the complexity and weight of the thermal management system.
Implementation Method 1
a second line including a coolant heater and a phase change material (PCM) and connected to the first line to form a first loop in which the coolant pump, the stack, the coolant heater, and the PCM are arranged
Implementation Method 2
the PCM is configured to be heat-exchanged with the coolant heater and the coolant
Implementation Method 3
a first line including a coolant pump and a fuel cell stack
Implementation Method 4
a third line including a radiator and connected to the first line to form a second loop in which the coolant pump, the stack, and the radiator are arranged
Implementation Method 5
a second line including a coolant heater and a phase change material (PCM)
Data Source
AI summary
A thermal management system for a fuel cell vehicle includes a first line including a coolant pump and a fuel cell stack, a second line including a coolant heater and a phase change material (PCM) and connected to the first line to form a first loop in which the coolant pump, the stack, the coolant heater, and the PCM are arranged, a third line including a radiator and connected to the first line to form a second loop in which the coolant pump, the stack, and the radiator are arranged, and an opening and closing valve opening and closing each of the first line, the second line, and the third line to allow the coolant to circulate in at least one of the first loop and the second loop, wherein the PCM is configured to be heat-exchanged with the coolant heater and the coolant.