Series-Connected Water Electrolysis Stacks for High-Voltage Insulation
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Solution Overview
Problem
When a large-scale water electrolytic hydrogen production system is configured using a plurality of water electrolysis stacks connected in series, the increased voltage leads to insufficient insulation performance, resulting in leakage currents and deterioration of durability and reliability.
Innovation Solution
The system includes an insulation member disposed at the connecting portions of piping for fluid supply and release in each water electrolysis apparatus, ensuring sufficient insulation performance by maintaining equipotentiality within the apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple water electrolysis stacks are connected in series to increase hydrogen production capacity, then the voltage of the electrolysis portion increases, but the insulation performance becomes insufficient leading to leakage current
Solution Approach 1:
The system divides the electrolysis stacks into multiple independent apparatuses, each with its own insulation member. This segmentation allows each apparatus to handle lower voltage individually while maintaining overall system capacity through modular arrangement.
Solution Approach 2:
An insulation member is introduced as an intermediary component between the electrolysis portion and the housing. This insulation member specifically addresses the insulation deficiency by providing dedicated electrical isolation at the connection portion where leakage current is most likely to occur.
2Power
If the number of water electrolysis stacks connected in series increases, then the maximum potential difference between electrolysis portion and grounded portions increases, but general insulation cannot maintain sufficient performance
Solution Approach 1:
Instead of relying on general insulation throughout the system, the invention applies enhanced insulation specifically at the connection portion between the electrolysis portion and the housing. This localized insulation approach addresses the most critical area where high potential difference causes leakage current.
3Device complexity
If water electrolysis stacks are connected in series to simplify power supply configuration, then the power supply structure becomes smaller and simpler, but insulation performance deteriorates under high voltage conditions
Solution Approach 1:
The system segments the electrolysis stacks into multiple apparatuses with independent insulation members, allowing series connection for simplified power supply while maintaining insulation reliability through modular design.
Solution Approach 2:
The insulation member serves as an intermediary that enables the series connection configuration by providing the necessary electrical isolation, thus allowing simplified power supply architecture without sacrificing insulation performance.
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 enhances the durability and reliability of the water electrolysis stacks and the entire system by maintaining adequate insulation even under high voltage conditions.
Implementation Method 1
a water electrolysis stack configured to generate hydrogen and oxygen by electrolysis of water
Data Source
Figure 1
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AI summary
Provided is a water electrolytic hydrogen production system configured by connecting a plurality of water electrolysis stacks in series, wherein the system is capable of ensuring sufficient insulation performance of each of the water electrolysis stacks. The water electrolytic hydrogen production system includes: a plurality of water electrolysis apparatuses, wherein each of the water electrolysis apparatuses includes: a water electrolysis stack configured to generate hydrogen and oxygen by electrolysis of water; a water supply portion configured to supply water to the water electrolysis stack; a water intake portion configured to take water into the water supply portion from outside; a hydrogen release portion configured to release hydrogen generated in the water electrolysis stack to outside; and an oxygen release portion configured to release oxygen generated in the water electrolysis stack to outside, the water electrolysis stacks of the plurality of water electrolysis apparatuses are electrically connected to each other in series, and an insulation member is disposed at a connecting portion of piping for supplying or releasing a fluid with outside of the apparatus, the piping including at least the water intake portion, the hydrogen release portion, and the oxygen release portion of each of the plurality of water electrolysis apparatuses.