Fuel Cell Stack Thermal Management via Segmented Coolant Distribution
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Solution Overview
Problem
Temperature variations within a fuel cell stack due to non-uniform coolant distribution lead to performance and durability issues, as existing thermal management systems fail to effectively control temperature gradients across the numerous unit cells.
Innovation Solution
An active thermal management system with a coolant distribution mechanism in the coolant inlet manifold, utilizing distribution plates, thermocouples, and flow control valves to dynamically adjust coolant flow based on temperature measurements, ensuring tailored coolant distribution to each set of unit cells to mitigate temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If uniform coolant distribution is used in the fuel cell stack, then the system structure is simple, but temperature variations occur across unit cells leading to performance deterioration
Solution Approach 1:
The coolant inlet manifold is divided into multiple coolant distribution spaces by distribution plates, allowing independent control of coolant flow to different unit cell groups. This segmentation enables tailored coolant distribution to address temperature variations in different regions of the fuel cell stack.
Solution Approach 2:
Flow control valves are installed in each coolant distribution space to dynamically adjust the degree of opening based on temperature measurements from thermocouples. This dynamic control allows the system to adapt coolant flow distribution in real-time to maintain uniform temperature across unit cells.
2Temperature
If coolant distribution is increased to reduce temperature variations, then temperature uniformity improves, but the system complexity and control requirements increase
Solution Approach 1:
Different coolant flow rates are supplied to different coolant distribution spaces based on the specific temperature requirements of each region. The flow control valves are adjusted individually to match the local thermal conditions of adjacent unit cells, achieving local optimization of temperature uniformity.
Solution Approach 2:
Thermocouples are installed in representative unit cells to continuously monitor temperature, and this temperature information is fed back to the control unit. The control unit adjusts the flow control valve openings based on the temperature feedback to maintain uniform temperature distribution across the fuel cell stack.
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 system achieves uniform temperature distribution across the fuel cell stack, enhancing performance and durability by addressing temperature gradients and improving cold startability through precise coolant allocation.
Implementation Method 1
a plurality of thermocouples, each disposed in a corresponding unit cell selected from the plurality of unit cells, measure the temperatures of the corresponding unit cells
Implementation Method 2
a coolant circulated by the cooling loop or heating loop is supplied to a coolant inlet manifold 14 of a fuel cell stack 10 to cool unit cells 12
Data Source
AI summary
An active thermal management system for a fuel cell stack controls the distribution of coolant flow for each unit cell of the fuel cell stack based on the temperature distribution measured at unit cells of the fuel cell stack. A coolant distribution means is capable of controlling the distribution of coolant flow for different sets of unit cells. The coolant distribution means is disposed in a coolant inlet manifold, and controls the coolant flow based on the temperature distribution measured at different unit cells of the fuel cell stack so as to reduce temperature variation in the unit cells, thus improving the performance and durability of the fuel cell stack.