Fuel Cell Stack Bus Bar Venting for Cooling and Moisture Discharge
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Solution Overview
Problem
Fuel cell systems in vehicles face issues with durability due to high temperatures in the stack bus bar, leading to insulation resistance deterioration and potential leaks, especially during low-temperature operations, and require improved ventilation to prevent moisture accumulation and enhance safety.
Innovation Solution
A fuel cell system design that incorporates a vent port structure to directly deliver external cold air to the stack bus bar through a terminal block assembly, using a vent hose and filters to reduce temperature and improve ventilation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the stack bus bar operates at high temperature to maintain electrical performance, then the electrical conductivity is improved, but the durability deteriorates due to insulation resistance deterioration and potential leaks
Solution Approach 1:
The patent segments the cooling function from the bus bar structure by introducing a separate cooling plate that contacts the bus bar. This allows the bus bar to operate at optimal temperature for electrical conductivity while the cooling plate manages thermal dissipation, preventing durability issues from direct thermal exposure.
Solution Approach 2:
The cooling plate acts as an intermediary between the hot bus bar and the external environment. It absorbs excess heat from the bus bar and transfers it to the cooling fluid circulating through channels, thereby protecting the bus bar from thermal damage while maintaining its electrical performance.
2Object-generated harmful factors
If the ventilation structure uses negative pressure from air compressor to discharge vapor and water, then the discharge function is achieved, but the vent efficiency deteriorates at low temperature and low current conditions causing moisture accumulation
Solution Approach 1:
The patent implements preliminary heating of the air compressor intake air or the ventilation path to ensure that even at low ambient temperatures, the ventilation system maintains sufficient temperature to prevent moisture condensation and maintain effective vapor discharge across all operating conditions.
Solution Approach 2:
The system changes operational parameters by adjusting compressor run cycles, intake air temperature, or pressure differential based on ambient conditions and current load. This ensures optimal vent efficiency across the full range of operating temperatures and current levels, preventing moisture accumulation during low-power operation.
3Power
If the stack bus bar has large cross-sectional area to handle high-output current, then the current carrying capacity is improved, but the packaging space requirement increases
Solution Approach 1:
The patent employs thin-film or laminated bus bar construction that provides high current carrying capacity through optimized material composition and layered structure. This reduces the overall thickness and volume of the bus bar while maintaining the required electrical conductivity and current handling capability.
Solution Approach 2:
The bus bar utilizes composite materials combining high-conductivity metals with space-efficient structural supports. This composite construction achieves the necessary current carrying capacity with reduced cross-sectional area compared to traditional solid metal bus bars, optimizing packaging space in the fuel cell assembly.
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 design enhances the durability of the stack bus bar by reducing its temperature and improves ventilation functionality, preventing moisture accumulation and ensuring safe operation by discharging gases and water effectively.
Implementation Method 1
a vent port that delivers external cold air to the stack bus bar
Implementation Method 2
the electrochemical reaction between hydrogen and oxygen
Implementation Method 3
the hydrogen supplied thereto is split into hydrogen ions and electrons at a catalyst of an anode
Implementation Method 4
the hydrogen ions cross over to a cathode through an electrolyte membrane
Implementation Method 5
the hydrogen ions are combined with supplied oxygen and electrons introduced through external wires, with the result that electrical energy is generated while water is produced
Data Source
AI summary
An embodiment fuel cell system includes a fuel cell stack configured to generate electrical energy from electrochemical reactions and a fuel cell enclosure surrounding the fuel cell stack. A high-voltage box is disposed on the fuel cell enclosure and is configured to provide the fuel cell enclosure with a ventilation path for cooling the fuel cell stack.