CN-122025688-A - Electrode plate corrosion prevention structure in metal pile cavity main pipe area and pile using same

CN122025688ACN 122025688 ACN122025688 ACN 122025688ACN-122025688-A

Abstract

The invention discloses a metal pile cavity main pipe region polar plate corrosion prevention structure and an applied pile, wherein the pile comprises a plurality of groups of metal bipolar plates which are stacked, a corrosion sacrificial structure is arranged on the metal bipolar plate positioned on the high-pressure side of a fuel cell pile and is close to the liquid outlet side of a circulation cavity in an extending way along a second direction, the corrosion sacrificial structure enables the edge region of the metal bipolar plate overlapped with an insulating sealing gasket to be preferentially subjected to electrochemical corrosion, corrosion to polar plate materials in the pile is reduced, the corrosion reaction can be preferentially carried out in a designed corrosion region, the discharge area can be effectively increased on the premise of not increasing the material cost and not sacrificing the design compactness, the corrosion current is intercepted in advance, the corrosion resistance of the metal bipolar plate is effectively improved, the highest potential and the reactive region adjacent to a power generation unit are protected, and the service life of the fuel cell pile is remarkably prolonged.

Inventors

ZHANG YUHANG
ZHOU QIAN
DUAN YUTING
LIU HAITAO
MA FANGFANG
SHI YAN
BAI GUANGJIN
CAO JIDONG
ZHANG GUOQIANG

Assignees

北京亿华通科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260211

Claims (10)

1. The utility model provides a metal pile cavity house steward regional polar plate anticorrosion structure which characterized in that includes: a plurality of groups of metal bipolar plates are stacked; The metal bipolar plate positioned on the high-voltage side of the fuel cell stack is close to the liquid outlet side of the flow cavity and is provided with an etching sacrificial structure in an extending manner along the second direction; the corrosion sacrificial structure is arranged at the edge area where the metal bipolar plate and the insulating sealing gasket are overlapped, so that the corrosion sacrificial structure is preferentially corroded electrochemically.
2. The metal stack cavity manifold area polar plate corrosion prevention structure according to claim 1, wherein the metal bipolar plate is provided with a hydrogen circulation port, an air circulation port and a cooling liquid circulation port, the hydrogen circulation ports of the metal bipolar plate are stacked to form a hydrogen circulation cavity, the air circulation ports of the metal bipolar plate are stacked to form an air circulation cavity, and the cooling liquid circulation ports of the metal bipolar plate are stacked to form a cooling liquid circulation cavity.
3. The metal stack cavity manifold area plate corrosion prevention structure according to claim 1, wherein the metal bipolar plate comprises a first bipolar plate, a second bipolar plate and a third bipolar plate stacked in a first direction, a plurality of groups of the first bipolar plates are stacked, and a hydrogen gas circulation port and an air circulation port of the first bipolar plates are opened.
4. The metal stack cavity manifold area plate corrosion prevention structure according to claim 3, wherein a set of second bipolar plate stacks are disposed outside of said first bipolar plate, hydrogen gas flow ports of said second bipolar plates are plugged, and air flow ports of said second bipolar plates are open.
5. The metal stack cavity manifold area plate corrosion prevention structure according to claim 4, wherein one or more sets of third bipolar plates are stacked outside the second bipolar plates, and hydrogen gas flow ports and air flow ports of the third bipolar plates are blocked.
6. The metal stack cavity manifold area plate corrosion prevention structure of claim 1, wherein the corrosion sacrificial structure is integrally formed at an end of the second bipolar plate and the third bipolar plate adjacent to the coolant flow lumen.
7. The corrosion resistant structure of claim 1, wherein said corrosion sacrificial structure is integrally formed at ends of said second bipolar plate and third bipolar plate adjacent to a coolant flow chamber, a hydrogen flow chamber and an air flow chamber.
8. The corrosion-resistant structure of a metal stack cavity manifold area electrode plate according to claim 1, wherein the corrosion-sacrificial structure comprises a connecting portion extending along a second direction, a plurality of groups of protruding portions are arranged at the end portion, close to the circulation cavity, of the connecting portion in an extending mode along a first direction, and the protruding portions are protruded by a distance of 2.0-3.0mm.
9. The metal stack cavity manifold area polar plate corrosion prevention structure according to claim 8, wherein protruding portions are protruding to be provided with protruding point portions close to the outer side edges of the circulation cavities, and protruding heights of the protruding point portions are 0.1-0.5mm.
10. A metal stack comprising a membrane electrode frame and an anti-corrosion structure according to any one of claims 1 to 9, the membrane electrode frame being arranged between metal bipolar plates.

Description

Electrode plate corrosion prevention structure in metal pile cavity main pipe area and pile using same Technical Field The invention relates to the technical field of fuel cell stacks, in particular to an anti-corrosion structure for a polar plate in a main pipe area of a metal stack cavity and a stack using the anti-corrosion structure. Background The metal polar plate has wide application in fuel cells due to excellent air tightness, heat conductivity and processability, but the corrosion problem severely restricts the durability of the electric pile, namely, in the actual operation process of the electric pile of the fuel cell, the cooling system cooling liquid outlet position continuously absorbs heat generated by the operation of the electric pile, the phenomenon of water temperature rise can occur, so that the ion concentration and conductivity in the cooling liquid are remarkably increased, meanwhile, the stacking assembly mode of the polar plates can lead each polar plate to form a series potential difference, and the key parts such as the contact interface of the three cavity opening edge of the polar plate water cavity and an insulating sealing gasket of the electric pile correspondingly have larger potential difference, the metal polar plate is extremely easy to generate local electrochemical corrosion in the environment, and the continuous electrochemical corrosion can cause the corrosion of the polar plate reaction area of the high pressure side of the electric pile, thereby causing the separation of iron ions in polar plate base materials, further causing the pollution of a membrane electrode and other problems, and the like, and also can cause the faults such as perforation of the polar plate reaction area, leakage of the cooling liquid and the like in serious cases, and serious threat to the operation safety of the electric pile. Aiming at the leakage hidden trouble caused by local electrochemical corrosion of a metal polar plate, various solutions are proposed in the prior art, namely, the traditional low-cost austenitic stainless steel polar plate material is replaced by a titanium material with higher price, the die stamping processing is inconvenient due to low stretching expansion rate, the production cost of a galvanic pile is greatly increased, the physical vapor deposition is adopted to prepare a protective coating on the polar plate surface, noble metals such as gold are required to be used as the coating material, the cost is higher, the cost index of DOE in the industry is not met, the industrialized expansion and batch are inconvenient, the production and manufacturing cost of the galvanic pile can be obviously increased, in addition, the mass power density and the volume power density of the galvanic pile can be reduced due to the increase of the thickness of the polar plate material, and the technical index advantage (high volume power density) of the galvanic pile can not be exerted, and the corrosion reaction of a polar plate reaction area can be fundamentally relieved or prevented. Disclosure of Invention The invention aims to solve the defects in the prior art, and provides an anti-corrosion structure for a polar plate in a main pipe area of a metal pile cavity and a pile using the same. In order to achieve the above object, in a first aspect, the present invention provides an anticorrosion structure for a metal stack cavity header region plate, including: a plurality of groups of metal bipolar plates are stacked; The metal bipolar plate positioned on the high-voltage side of the fuel cell stack is close to the liquid outlet side of the flow cavity and is provided with an etching sacrificial structure in an extending manner along the second direction; the corrosion sacrificial structure is arranged at the edge area where the metal bipolar plate and the insulating sealing gasket are overlapped, so that the corrosion sacrificial structure is preferentially corroded electrochemically. In some embodiments, the metal bipolar plate is provided with a hydrogen gas flow port, an air flow port and a cooling liquid flow port, the hydrogen gas flow ports of the metal bipolar plate are stacked to form a hydrogen gas flow chamber, the air flow ports of the metal bipolar plate are stacked to form an air flow chamber, and the cooling liquid flow ports of the metal bipolar plate are stacked to form a cooling liquid flow chamber. In some of these embodiments, the metal bipolar plate includes a first bipolar plate, a second bipolar plate, and a third bipolar plate disposed in a stack along a first direction, with a plurality of sets of the first bipolar plates disposed in a stack, with the hydrogen and air flow ports of the first bipolar plates open. In some of these embodiments, a set of second bipolar plate stacks are disposed outside of the first bipolar plate, with the hydrogen flow ports of the second bipolar plates plugged and the air flow ports of the second bipolar plates open. In so