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Bipolar plate for water electrolyser

A water electrolysis cell and bipolar plate technology, which is applied to electrodes, electrolysis process, electrolysis components, etc., can solve problems such as inability to combine metal bipolar plates, falling off and dislocation of the electrolytic cell, affecting the performance of membrane electrodes, etc. effect, increase the pressure of hydrogen storage, and facilitate the effect of hydrogen storage

Pending Publication Date: 2022-02-11
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second is a metal plate and a non-metallic frame pasted on the outside. This type of bipolar plate cannot withstand high pressure when used in an electrolytic cell, and the organic matter contained in the glue is dissolved by water and affects the performance of the membrane electrode.
[0004] The existing bipolar plate sealing rings are all placed in the groove, which cannot be tightly combined with the metal bipolar plate, and are easy to fall off and dislocate when assembling the electrolytic cell

Method used

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  • Bipolar plate for water electrolyser
  • Bipolar plate for water electrolyser
  • Bipolar plate for water electrolyser

Examples

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Embodiment 1

[0028] An injection-molded non-metal frame bipolar plate for a water electrolyzer, the non-metal frame bipolar plate includes a metal separator 1, a non-metal frame 2 and a sealing ring 3; wherein the non-metal frame 2 is integrated on the metal separator 1 Injection molding, the sealing ring 3 is secondary injection molding in the groove of the non-metallic frame 2, and the non-metallic frame 2 and the sealing ring 3 are integrally vulcanized and formed. The metal separator is divided into an oxygen / water side and a hydrogen side, and the oxygen / water surface is a groove structure 11, which provides a circulation channel for the electrolyte. The hydrogen side is a flat plate, which cooperates with the non-metallic frame 2 as a place for generating hydrogen. A plurality of concentric protruding rings 12 are arranged on the outside of the oxygen / water side and the hydrogen side. This structure can ensure that the non-metal frame 2 will not be separated from the metal separator ...

Embodiment 2

[0031] The non-metal frame bipolar plate of the invention is injection-molded, and the flow field plate is arranged on the hydrogen side plate, and the water permeable plate is arranged on the oxygen / water side. For the electrolysis chamber. The top and bottom of the electrolysis cell group are arranged in sequence with collector plates, insulating plates, and end plates to form a hydrogen production capacity of 25Nm 3 / h electrolyzer. The stack is placed in the test system, which is constructed of plastic pipes to prevent other components from entering the ions and mixing into the electrolyte. After working for 200 hours, the concentration of metal ions in the measured water did not increase, and the conductivity was 1 μS / cm. The purity of hydrogen and oxygen produced by measurement is 99.99% and 99.9% respectively; higher than that of the metal bipolar plate of Comparative Example 1. When the working pressure of the electrolyzer is increased to 4MPa, it works normally wit...

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Abstract

The invention discloses a bipolar plate used for a water electrolyser and having a non-metal frame formed through injection molding, belonging to the technical field of water electrolysis. The bipolar plate with the non-metal frame formed through injection molding comprises a metal partition plate, the non-metal frame and a rubber sealing ring, wherein the non-metal frame is formed by injection molding and fused with the metal partition plate into a whole, and the sealing ring is vulcanized and formed in a groove of the non-metal frame. The non-metal frame and the metal partition plate are integrally formed, so the size of the bipolar plate can be guaranteed, and a structure is simplified; the non-metal frame avoids electrochemical corrosion of a water channel and a hydrogen channel, and electrolyte pollution caused by metal ions entering water is reduced; and the sealing ring and the non-metal frame are vulcanized into a whole, so the sealing ring is prevented from being staggered when the water electrolyser is assembled. The bipolar plate with the non-metal frame is particularly suitable for PEM water electrolysis occasions with high requirements on water quality.

Description

Technical field [0001] The invention belongs to the technical field of water electrolysis and hydrogen production, and specifically relates to a metal frame bipolar plate for water electrolysis cells. Background technique [0002] As the whole society pays more and more attention to environmental protection, the use of hydrogen energy has gradually attracted attention. Water electrolysis hydrogen production technology is very popular because it can obtain hydrogen safely and efficiently. The equipment for producing hydrogen through water electrolysis is an electrolyzer, which can electrolyze water into hydrogen and oxygen through electrical energy. Hydrogen and oxygen are located on both sides of the bipolar plate. As one of the core components of the electrolytic cell, the bipolar plate directly affects the performance of the entire electrolytic cell. [0003] The bipolar plates of existing water electrolyzer technology are divided into two categories. One is the integra...

Claims

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Application Information

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IPC IPC(8): C25B11/036C25B1/04
CPCC25B11/036C25B1/04Y02E60/36
Inventor 孙凯俞红梅邵志刚迟军刘凯
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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