Fibre-Reinforced Electrochemical Stack Assembly for High Pressure
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Solution Overview
Problem
Existing electrochemical units face limitations in pressure containment, shape restrictions, and efficiency due to the use of steel pressure vessels, which limit hydrogen output pressure and require additional compressors, increasing cost and reducing energy efficiency.
Innovation Solution
An electrochemical assembly with fibre-reinforced casings that provide longitudinal and radial compression to the stack, eliminating the need for separate components and allowing operation at higher pressures, and incorporating endcaps as fluid and electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If steel pressure vessels are used for pressure containment, then structural strength is provided, but the maximum operating pressure is limited to around 100 bar due to tensile strength limitations
Solution Approach 1:
The patent applies composite materials by wrapping the electrochemical stack with fibre-reinforced material (such as carbon fibre, glass fibre, or aramid fibre) that has been impregnated with a polymer matrix. This composite structure provides superior tensile strength compared to steel, enabling the stack to withstand higher internal pressures (potentially exceeding 100 bar) without mechanical failure. The fibre orientation can be optimized to resist the circumferential stress generated by internal pressure, directly resolving the contradiction between structural strength and maximum operating pressure.
2Stress or pressure
If additional pressure containment components are added to increase maximum pressure, then pressure containment is improved, but device complexity and cost increase
Solution Approach 1:
The patent merges the pressure containment function with the existing stack structure by integrating the fibre-reinforced wrapping directly onto the stack body. This eliminates the need for separate steel pressure vessels or additional containment components, as the fibre-reinforced material itself provides the necessary pressure containment. The wrapping serves dual purposes: structural reinforcement and pressure containment, thereby reducing device complexity while enabling higher maximum differential pressures.
3Stress or pressure
If fibre-reinforced casing is used to provide pressure containment, then maximum operating pressure is increased, but manufacturing complexity increases
Solution Approach 1:
The patent employs flexible fibre-reinforced material that can be wrapped around the stack in a manner similar to conventional piping or tank manufacturing. The fibre-reinforced material is applied in a flexible state (before full curing of the polymer matrix) and then cured in place, allowing for relatively simple manufacturing processes. This approach avoids complex forming operations required for rigid composite structures, making the manufacturing process more accessible while still achieving high-pressure containment capabilities.
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
Enables operation at higher pressures without mechanical failure, reduces the need for external compressors, enhances efficiency, and simplifies manufacturing and transportation by using lightweight, cost-effective materials.
Implementation Method 1
fibre-reinforced casings that provide longitudinal and radial compression to the stack
Implementation Method 2
Hydrogen may be produced by the electrolysis of water, where electrical energy allows water molecules to be split into hydrogen and oxygen molecules
Data Source
AI summary
An electrochemical assembly, comprising: a plurality of electrochemical cells arranged to form an electrochemical stack having a first end and a second end; a first endcap disposed at the first end of the electrochemical stack, and a second endcap disposed at the second end of the electrochemical stack, and at least one of the endcaps being arranged to provide a fluidic connection to the electrochemical stack; wherein the first and second endcaps are secured to the electrochemical stack by a fibre-reinforced casing that extends around at least a portion of the electrochemical stack and at least a portion of each endcap such that a fluidic seal is formed between the electrochemical stack and each endcap.