Fuel Cell Bubble Detection and Pump Control
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Solution Overview
Problem
The accumulation of bubbles in the cooling water flow path of a fuel cell stack reduces cooling efficiency and power generation efficiency, with existing solutions not effectively determining the cause of bubble accumulation.
Innovation Solution
A fuel cell system that includes a control device with a bubble detection and cause determination portion to identify whether bubble accumulation is due to reactant gas leakage, featuring a removal device to discharge bubbles and a warning device for leakage detection, utilizing a pump to manage bubble removal and a specific stacking configuration to facilitate bubble discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pump rotating speed is increased to discharge bubbles from the cooling water flow path, then bubble removal efficiency is improved, but power consumption increases and system complexity increases
Solution Approach 1:
The pump rotating speed is dynamically adjusted based on bubble accumulation detection. When bubbles are detected in the cooling water flow path, the pump speed is increased to discharge bubbles; when no bubbles are present, the pump operates at normal speed or stops, reducing power consumption while maintaining effective bubble removal capability
Solution Approach 2:
A bubble detection device provides feedback on bubble accumulation in the cooling water flow path. This feedback signal controls the pump operation, creating a closed-loop system that adjusts pump speed based on actual bubble conditions, thereby optimizing both bubble removal efficiency and power consumption
2Temperature
If the pump rotating speed is frequently adjusted to remove bubbles, then cooling efficiency is maintained, but system reliability decreases due to increased wear
Solution Approach 1:
The bubble detection device provides feedback that triggers pump operation only when bubbles are actually present. This on-demand operation reduces unnecessary pump启停 cycles and speed adjustments, thereby maintaining cooling efficiency while reducing mechanical wear and improving pump reliability
Solution Approach 2:
The system uses the bubble detection feedback to automatically control pump operation without requiring external intervention. The pump serves itself by operating only when the system actually needs bubble removal, reducing unnecessary wear from frequent adjustments
3Device complexity
If bubble accumulation is not detected and addressed, then system complexity is reduced, but cooling efficiency and power generation efficiency deteriorate
Solution Approach 1:
A bubble detection device provides feedback on bubble accumulation in the cooling water flow path. This feedback triggers appropriate responses (pump speed adjustment or warning signals) to maintain cooling efficiency and power generation performance without requiring complex additional systems
Solution Approach 2:
The bubble detection device acts as an intermediary between the cooling water flow path and the pump control system. It provides the necessary information to trigger pump operation or warning signals, maintaining system efficiency without requiring direct complex interaction between all system components
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
Effectively determines the cause of bubble accumulation, enhances cooling efficiency, and maintains power generation performance by accurately addressing bubble issues and optimizing bubble discharge processes.
Implementation Method 1
the pump that discharges bubbles from the cooling water flow path by increasing and decreasing a rotating speed of the pump
Implementation Method 2
A fuel cell stack includes a stacked body including unit cells stacked. The stacked body is provided with reactant gas flow paths through which reactant gases flow
Data Source
AI summary
A fuel cell system comprising: a fuel cell stack including: a stacked body in which unit cells are stacked, the unit cells including first and second unit cells; a reactant gas flow path; and a cooling water flow path; a pump that supplies cooling water to the cooling water flow path; a supply device that supplies reactant gas to the reactant gas flow path; and a control device configured to include: a bubble detection portion configured to detect an accumulation of bubbles in the cooling water flow path; and a cause determination portion configured to determine whether or not the accumulation of bubbles is caused by leakage of the reactant gas from the reactant gas flow path, when the bubble detection portion detects the accumulation of bubbles.