Fuel cell hydrogen path heat exchanger assembly

Abstract

The utility model relates to a fuel cell hydrogen path heat exchanger assembly which comprises a heat exchanger, a water path connected with a heat exchanger pipeline and a hydrogen path connected with a heat exchanger pipeline, pipeline joints made of insulating materials are arranged between the hydrogen path and an inlet and an outlet of the heat exchanger, and a grounding pile is further arranged in the heat exchanger. The grounding pile is connected with a grounding point on the fuel cell stack package through a grounding wire, and the grounding wire between the grounding pile and the grounding point on the fuel cell stack package is connected with a switch.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cells, in particular to a fuel cell hydrogen path heat exchanger component. Background Art

[0002] Fuel cell systems have inherent insulation problems. The main reason is that the electrodes of the fuel cell stack are connected to the cooling water circuit. Therefore, whether the cooling water circuit has an advance grounding point and the conductivity of deionized water or special coolant play a crucial role in the insulation performance of the overall system.

[0003] At present, many fuel-electric systems often connect "heat exchangers" in series in the hydrogen circuit to improve performance, and heat the hydrogen to a certain extent through heat exchange between the water circuit and the heat exchanger. However, this creates a contradiction: the pipelines of the hydrogen circuit must be grounded for safety reasons, while the water circuit cannot be grounded in advance, and the heat exchanger has both hydrogen circuit and water circuit attributes, that is, as one of the elements in the water circuit, in order to improve the insulation performance of the overall system, it should not be grounded here; and as one of the elements in the hydrogen circuit, for safety considerations, it should and must be grounded, which forms a contradiction. There is no good way to solve the insulation problem of the heat exchanger. Either choose to ignore it, give up improving the insulation performance, connect the heat exchanger to the hydrogen pipeline normally, and ground it through the hydrogen pipeline. This approach ensures the safety of the hydrogen circuit, but reduces the insulation performance of the overall system; another approach is to directly isolate the two ends of the heat exchanger and float the heat exchanger. After the electricity accumulates, it can only be released naturally, which is slow and has safety hazards such as ignition. Utility Model Content

[0004] In order to solve the above-mentioned problems in the prior art, the utility model first provides a fuel cell hydrogen circuit heat exchanger assembly, which includes a heat exchanger, a water circuit connected to the heat exchanger pipeline, and a hydrogen circuit connected to the heat exchanger pipeline, and is characterized in that: a pipe joint made of insulating material is arranged between the hydrogen circuit and the inlet and outlet of the heat exchanger, and a grounding pile is also arranged in the heat exchanger, and the grounding pile is connected to the grounding point on the fuel cell stack package through a grounding wire, wherein a switch is connected to the grounding wire between the grounding pile and the grounding point on the fuel cell stack package.

[0005] A further technical feature of the utility model is that the switch connected to the grounding wire between the grounding pile and the grounding point on the fuel cell stack package is a normally closed contactor, the grounding wire at one end of the grounding pile is electrically connected to one contact of the normally closed contactor, the grounding wire at one end of the grounding point on the fuel cell stack package is electrically connected to another contact of the normally closed contactor, the coil drive end of the normally closed contactor is electrically connected to the fuel cell controller and the DC power supply, and the attraction of the normally closed contactor is controlled by the fuel cell controller.

[0006] The beneficial effects of the utility model are:

[0007] Since a pipe joint of insulating material is provided between the inlet and outlet of the hydrogen circuit and the heat exchanger in the utility model, the heat exchanger floats up to become an island, and will not be grounded due to the grounding of the hydrogen pipeline; in addition, a grounding pile is also provided in the heat exchanger, and the grounding pile is connected to the grounding point on the fuel cell stack package through a grounding wire, wherein a switch is connected to the grounding wire between the grounding pile and the grounding point on the fuel cell stack package, and after the system is powered on, the switch is disconnected, at which time the heat exchanger grounding wire is disconnected, the heat exchanger floats up, and the water circuit will not be grounded in advance here, thereby improving the overall insulation performance of the system. However, during the operation of the system, a certain amount of electricity will accumulate on the heat exchanger; after the system is shut down, the switch is closed, the heat exchanger grounding wire is turned on, and the previously accumulated electricity is released through the grounding wire to prevent excessive accumulation of electricity from causing safety hazards. Therefore, the utility model simultaneously ensures the insulation performance of the system and the grounding safety of the hydrogen circuit, achieving the beneficial effect of having both fish and bear's paw. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The structure and further objects and advantages of the present invention will be better understood through the following description in conjunction with the accompanying drawings, in which the same reference numerals identify the same elements:

[0009] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0010] Figure 2 yes Figure 1 A schematic diagram of the structure of the normally closed contactor when it is disconnected in the illustrated embodiment. DETAILED DESCRIPTION

[0011] The specific implementation of the present utility model will be described below in conjunction with the accompanying drawings.

[0012] refer to Figure 1A fuel cell hydrogen path heat exchanger assembly comprises a heat exchanger 1, a water path 2 connected to the heat exchanger 1 by a pipeline, and a hydrogen path 3 connected to the heat exchanger 1 by a pipeline, characterized in that a pipeline joint 4 made of insulating material is arranged between the hydrogen path 3 and the inlet and outlet of the heat exchanger 1, and a grounding pile 5 is also arranged in the heat exchanger, and the grounding pile 5 is connected to a grounding point 7 on the fuel cell stack package through a grounding wire 6, wherein a switch 8 is connected to the grounding wire between the grounding pile 5 and the grounding point on the fuel cell stack package, in this embodiment, the switch 8 is a normally closed contactor, the grounding wire at one end of the grounding pile is electrically connected to a contact of the normally closed contactor, the grounding wire at one end of the grounding point on the fuel cell stack package is electrically connected to another contact of the normally closed contactor, the coil driving end of the normally closed contactor is electrically connected to a fuel cell controller 9 and a DC power supply 10, and the attraction of the normally closed contactor 8 is controlled by the fuel cell controller 9.

[0013] Since a pipe joint 4 made of insulating material is provided between the hydrogen circuit 3 and the inlet and outlet of the heat exchanger 1 in the utility model, the heat exchanger floats to become an isolated island and will not be grounded due to the grounding of the hydrogen pipeline 3; in addition, a grounding pile 5 is also provided in the heat exchanger 3, and the grounding pile 5 is connected to the grounding point 7 on the fuel cell stack package through a grounding wire 6, wherein a normally closed contactor 8 is connected to the grounding wire between the grounding pile 5 and the grounding point 7 on the fuel cell stack package, and the grounding wire at one end of the grounding pile is electrically connected to a contact of the normally closed contactor, and the grounding wire at one end of the grounding point on the fuel cell stack package is electrically connected to another contact of the normally closed contactor, and the coil driving end of the normally closed contactor is electrically connected to the fuel cell controller 9 and the DC power supply 10, and the attraction of the normally closed contactor 8 is controlled by the fuel cell controller 9. After the system is powered on, the fuel cell controller 9 drives the contactor to disconnect. Figure 2 As shown, at this time, the heat exchanger grounding wire is disconnected, heat exchanger 1 floats, and water channel 2 will not be grounded in advance, which improves the overall insulation performance of the system. However, during the operation of the system, a certain amount of electricity will accumulate on the heat exchanger; in the system shutdown process, the control power is generally cut off after the purge is completed and the stack voltage drops below 60V. At this time, the fuel cell controller releases the drive, the contactor is pulled in again, and the heat exchanger grounding wire is turned on, as shown in the figure below. Figure 1 As shown, the previously accumulated electricity is released through the ground wire to prevent excessive accumulation of electricity from causing safety hazards. Therefore, the utility model simultaneously ensures the insulation performance of the system and the grounding safety of the hydrogen circuit, achieving the beneficial effect of having both fish and bear's paw.

[0014] The technical content and technical features of the utility model have been disclosed above, but it can be understood that under the creative idea of ​​the utility model, those skilled in the art can make various changes and improvements to the above structure, including the combination of technical features disclosed or claimed separately here, and other combinations that obviously include these features. These deformations and / or combinations all fall within the technical field involved in the utility model and fall within the protection scope of the claims of the utility model.

Claims

1. A fuel cell hydrogen circuit heat exchanger assembly, comprising a heat exchanger, a water circuit connected to the heat exchanger pipeline, and a hydrogen circuit connected to the heat exchanger pipeline, characterized in that: A pipe joint made of insulating material is arranged between the hydrogen circuit and the inlet and outlet of the heat exchanger. A grounding pile is also arranged in the heat exchanger. The grounding pile is connected to a grounding point on the fuel cell stack package through a grounding wire. A switch is connected to the grounding wire between the grounding pile and the grounding point on the fuel cell stack package.

2. The fuel cell hydrogen gas path heat exchanger assembly according to claim 1, characterized in that: The switch connected to the grounding wire between the grounding pile and the grounding point on the fuel cell stack package is a normally closed contactor. The grounding wire at one end of the grounding pile is electrically connected to one contact of the normally closed contactor, and the grounding wire at one end of the grounding point on the fuel cell stack package is electrically connected to another contact of the normally closed contactor. The coil driving end of the normally closed contactor is electrically connected to the fuel cell controller and the DC power supply, and the attraction of the normally closed contactor is controlled by the fuel cell controller.

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