Fuel Cell Stack Cooling Layout for High-Output Stationary Operation
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Solution Overview
Problem
Fuel cell systems face challenges in effectively cooling the fuel cell stack when high output is required while the vehicle is stationary, leading to safety and durability issues due to insufficient air flow generated by cooling fans.
Innovation Solution
A fuel cell system with a dual cooling line configuration, including a first cooling line for the fuel cell stack and a second cooling line for power electronic parts, connected by a heat exchanger to facilitate heat exchange between the coolants, along with radiators and a cooling fan to manage temperatures effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a cooling fan is used to cool the fuel cell stack while stationary, then the fuel cell stack can be cooled without vehicle motion, but the air flow generated is insufficient to provide high output cooling
Solution Approach 1:
The patent merges the cooling functions of the fuel cell stack and power electronic parts into a single integrated cooling system. The first cooling line cools the fuel cell stack while the second cooling line cools power electronic parts, and both are connected through a common coolant circulation system with radiators, allowing efficient heat dissipation for both components even when stationary.
Solution Approach 2:
The patent segments the cooling system into separate cooling lines: a first cooling line for the fuel cell stack and a second cooling line for power electronic parts. This segmentation allows each component to be cooled independently with optimized coolant flow paths, ensuring sufficient cooling capacity for high output operation while stationary.
2Productivity
If vehicle-induced wind is used to cool the fuel cell stack, then cooling is effective during vehicle motion, but cooling is insufficient when the vehicle is stationary
Solution Approach 1:
The patent implements a dynamic cooling system that adapts to different operating conditions. The cooling system includes radiators and coolant circulation that can effectively cool the fuel cell stack both when the vehicle is moving (supplementing vehicle-induced wind) and when stationary (providing primary cooling), thus adapting to various operational scenarios.
3Power
If high output is required from the fuel cell stack while stationary, then power demand is met, but the fuel cell stack temperature increases due to insufficient cooling
Solution Approach 1:
The patent implements preliminary cooling action by circulating coolant through the first cooling line that passes through the fuel cell stack before high output operation begins or during the onset of heating. The coolant absorbs heat proactively, preventing temperature rise that would compromise safety and durability during high power stationary operation.
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 configuration ensures efficient cooling of the fuel cell stack, even when stationary, enhancing safety and reliability by maintaining optimal temperatures and improving the high-output operation of the fuel cell system.
Implementation Method 1
a heat exchanger configured to allow the first coolant and the second coolant to exchange heat
Implementation Method 2
a first radiator disposed along the first cooling line and configured to cool the first coolant; and a second radiator disposed along the second cooling line and configured to cool the second coolant
Data Source
AI summary
A fuel cell system for a vehicle includes: a first cooling line to pass through a fuel cell stack in the vehicle and to circulate a first coolant therethrough; a second cooling line to pass through a power electronic part in the vehicle and to circulate a second coolant therethrough; and a heat exchanger to allow the first coolant and the second coolant to exchange heat.