Cold start heat exchange device of hydrogen fuel cell

Abstract

The utility model provides a cold start heat exchange device for a hydrogen fuel cell, and belongs to the technical field of hydrogen fuel cells. The technical problem that the heat exchange rate of the hydrogen fuel cell in the cold start heating process is low is solved. Comprising a plurality of accommodating grooves for accommodating heat exchange parts in the circumferential direction of an accommodating part, when heat exchange is not needed, the plurality of heat exchange parts lean against one another to reduce the heat dissipation area so as to further reduce the heat loss, and the battery can be quickly heated when the hydrogen fuel battery is cold-started next time; when the battery is in cold start, the medium driving assembly drives the heat exchange medium in the heat exchange cavity to be filled into the expansion cavity and pushes the heat exchange part to slide out of the storage groove, the heat dissipation area is increased, and the heat exchange rate is increased.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen fuel cell technology, and in particular to a cold start heat exchange device for hydrogen fuel cells. Background Technology

[0002] Hydrogen energy is an important zero-carbon energy source, hailed as the energy source of humanity's future. Hydrogen fuel cell transportation is a crucial pillar and core carrier for the development of hydrogen energy. Hydrogen fuel cells face a cold-start challenge at low temperatures. Although purging after shutdown can partially alleviate the cold-start problem, long cold-start times still exist at low temperatures.

[0003] Existing solutions involve heating hydrogen fuel cells during cold starts, but the heat exchange rate is slow during the heating process. Utility Model Content

[0004] In view of this, the present invention aims to propose a cold start heat exchange device for hydrogen fuel cells to solve the technical problem of slow heat exchange rate during the cold start heating process of hydrogen fuel cells.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: According to one aspect of the present invention, a cold start heat exchange device for a hydrogen fuel cell is provided, comprising:

[0006] The storage section has multiple storage slots arranged circumferentially;

[0007] A heat exchange chamber is located inside the receiving part and contains a heat exchange medium.

[0008] The heat exchange section is radially slidably disposed inside the receiving groove along the receiving section, and has an expansion cavity inside that communicates with the heat exchange chamber;

[0009] The medium drive assembly is located on the receiving section to control the flow of the medium inside the heat exchange chamber into the expansion chamber.

[0010] Furthermore, a movable plug is slidably disposed inside the expansion cavity, and an elastic part is provided at the end of the movable plug away from the heat exchange medium, with the other end of the elastic part disposed on the heat exchange medium.

[0011] Furthermore, the heat exchange section is equipped with a sliding tube, and the expansion chamber is continuously connected to the heat exchange chamber through the sliding tube.

[0012] Furthermore, two sets of movable plugs are slidably arranged inside the expansion cavity. The minimum distance between the two sets of movable plugs is greater than the diameter of the sliding tube, and the two sets of movable plugs are located on both sides of the sliding tube.

[0013] Furthermore, the heat exchange section and the storage section are connected by a reset assembly.

[0014] Furthermore, the reset assembly includes a connecting bolt and a reset spring. One end of the connecting bolt is disposed on the heat exchange section, and the other end slides inside the receiving section. The reset spring is fitted onto the connecting bolt and disposed inside the receiving section.

[0015] Furthermore, the medium driving component is a movable column, which slides through one end face of the receiving part inside the heat exchange chamber.

[0016] Furthermore, the diameter of the moving column is smaller than the diameter of the heat exchange cavity orifice.

[0017] Furthermore, the sliding tube is positioned in the middle of the heat exchange section.

[0018] Furthermore, the heat exchange medium is a solid-liquid phase change material (PCM) coupled with a PTC.

[0019] Beneficial effects:

[0020] The storage section has multiple storage slots around its circumference for storing the heat exchange sections. When heat exchange is not required, the multiple heat exchange sections are close together to reduce the heat dissipation area and thus reduce heat loss. During the next cold start of the hydrogen fuel cell, the battery can be heated up quickly. During the cold start of the battery, the medium drive component drives the heat exchange medium inside the heat exchange chamber to fill the expansion chamber and pushes the heat exchange section to slide out from the storage slot, increasing the heat dissipation area and improving the heat exchange rate. Attached Figure Description

[0021] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0022] Figure 1 This is a schematic diagram of the overall structure of a hydrogen fuel cell cold start heat exchange device according to the present invention;

[0023] Figure 2 This is a cross-sectional view of a cold start heat exchange device for a hydrogen fuel cell according to the present invention.

[0024] Figure 3 for Figure 2 Enlarged view of a portion of point A in the middle;

[0025] Figure 4 This is a schematic diagram of the storage section of a hydrogen fuel cell cold start heat exchange device according to the present invention.

[0026] Storage section 1; storage tank 2; heat exchange chamber 3; heat exchange section 4; medium driving assembly 5; moving plug 6; elastic part 7; connecting bolt 8; return spring 9; sliding tube 10; adjusting device 11; expansion chamber 12. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present utility model can be combined with each other, and the described embodiments are only some embodiments of the present utility model, not all embodiments.

[0028] It should be noted that the descriptions of "left," "right," "left side," "right side," "upper part," "lower part," "top," and "bottom" in this utility model are defined based on the orientation or positional relationships shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and are not intended to indicate or imply that the described structure must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0029] In the description of this utility model, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] Referring to the accompanying drawings, this embodiment provides a cold-start heat exchange device for a hydrogen fuel cell, comprising:

[0031] The storage section 1 has multiple storage slots 2 in the circumferential direction. The storage section 1 is a hollow cylinder to reduce the heat dissipation area. The cylinder has multiple through slots in the axial direction for storing the heat exchange section 4.

[0032] The heat exchange chamber 3 is located inside the housing 1 and contains a heat exchange medium. The heat exchange chamber 3 is a cylindrical cavity, which can increase the storage volume of the medium. The heat exchange medium is a solid-liquid phase change material (PCM). The use of solid-liquid phase change material (PCM) can store a large amount of heat in a specific temperature range and release heat rapidly during the cold start of the hydrogen fuel cell. It can efficiently store energy in a limited space and reserve energy for cold start.

[0033] The heat exchange section 4 is radially slidably disposed inside the storage groove 2 along the storage section 1. The inside is provided with an expansion cavity 12 that communicates with the heat exchange chamber 3. The shape of the heat exchange section 4 corresponds to the storage groove 2, so that the heat exchange section 4 and the storage section 1 form a cylinder.

[0034] The medium driving component 5 is installed on the receiving part 1 to control the flow of the medium inside the heat exchange chamber 3 into the expansion chamber 12. The adjusting device 11 drives the medium driving component 5 to adjust the volume inside the heat exchange chamber 3 to achieve the flow of the medium.

[0035] The storage section 1 is provided with multiple storage slots 2 around the perimeter for storing the heat exchange section 4. When heat exchange is not required, the multiple heat exchange sections 4 are close together to reduce the heat dissipation area and thus reduce heat loss. During the next cold start of the hydrogen fuel cell, the battery can be heated up quickly. During the cold start of the battery, the medium drive component 5 drives the heat exchange medium inside the heat exchange chamber 3 to fill the expansion chamber 12 and pushes the heat exchange section 4 to slide out from the storage slot 2, increasing the heat dissipation area and improving the heat exchange rate.

[0036] In this embodiment, a movable plug 6 is slidably disposed inside the expansion cavity 12. The end of the movable plug 6 away from the heat exchange medium is provided with an elastic part 7. The other end of the elastic part 7 is disposed on the heat exchange section 4. The heat exchange section 4 is provided with a sliding tube 10. The expansion cavity 12 is continuously connected to the heat exchange cavity 3 through the sliding tube 10. Two sets of movable plugs 6 are slidably disposed inside the expansion cavity 12. The minimum distance between the two sets of movable plugs 6 is greater than the diameter of the sliding tube 10. The two sets of movable plugs 6 are located on both sides of the sliding tube 10. The sliding tube 10 is disposed in the middle of the heat exchange section 4. There are two movable plugs 6 inside the expansion cavity 12. Each movable plug 6 is provided with an elastic part 7 that is a spring. When the medium inside the heat exchange cavity 3 enters the expansion cavity 12, it will push the movable plug 6 to move towards both ends of the heat exchange section 4. The heat exchange section 4 is filled with medium as much as possible, thereby increasing the contact area between the medium and the inside of the battery. As the medium is filled into the expansion cavity 12, the heat exchange section 4 gradually slides from inside the receiving groove 2, further increasing the base surface for heat exchange.

[0037] In this embodiment, the heat exchange section 4 and the storage section 1 are connected by a reset assembly. The reset assembly includes a connecting bolt 8 and a reset spring 9. One end of the connecting bolt 8 is disposed on the heat exchange section 4, and the other end slides inside the storage section 1. The reset spring 9 is fitted on the connecting bolt 8 and disposed inside the storage section 1. When heat exchange stops, in order to reduce heat loss, the reset spring 9 will drive the heat exchange section 4 to move and recycle the storage tank 2 through the connecting bolt 8.

[0038] In this embodiment, the medium driving component 5 is a movable column. The movable column slides through one end face of the receiving part 1 and is placed inside the heat exchange cavity 3. The diameter of the movable column is smaller than the aperture of the heat exchange cavity 3. The adjustment device 11 is set on the receiving part 1. When heat exchange is required, the receiving part 1 drives the cylindrical medium driving component 5 to gradually slide into the heat exchange cavity 3, pushing the medium inside the heat exchange cavity 3 into the expansion cavity 12 through the sliding tube 10, and then gradually filling the expansion cavity 12.

[0039] In this embodiment, the heat exchange medium is a solid-liquid phase change material (PCM) coupled with a PTC. The PTC resistance increases with increasing temperature. At low temperatures, the PTC provides high-power heating for rapid temperature rise; as the temperature approaches a suitable level, the heating power automatically decreases to prevent overheating. The PCM provides basic heat storage, and the PTC is finely adjusted in real time to ensure that the fuel cell can start rapidly at a suitable heating rate under different low-temperature conditions, balancing start-up speed and battery life.

[0040] The sensors, controllers, and control programs mentioned above are all existing technologies and will not be elaborated upon.

[0041] The embodiments of the present invention disclosed above are merely illustrative of the present invention. The embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific implementations described. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention.

Claims

1. A cold-start heat exchange device for a hydrogen fuel cell, characterized in that, include: The storage section (1) has multiple storage slots (2) arranged around its perimeter; The heat exchange chamber (3) is located inside the receiving part (1) and contains a heat exchange medium. The heat exchange section (4) is radially slidably disposed inside the storage groove (2) along the storage section (1), and has an expansion cavity (12) communicating with the heat exchange chamber (3) inside; The medium driving assembly (5) is disposed on the receiving part (1) and is used to control the flow of the medium inside the heat exchange chamber (3) into the expansion chamber (12).

2. The cold start heat exchange device for a hydrogen fuel cell according to claim 1, characterized in that: The expansion cavity (12) is equipped with a movable plug (6), the end of the movable plug (6) away from the heat exchange medium is connected to one end of the elastic part (7), and the other end of the elastic part (7) is disposed on the heat exchange part (4).

3. The cold start heat exchange device for a hydrogen fuel cell according to claim 2, characterized in that: The heat exchange section (4) is provided with a sliding tube (10), and the expansion chamber (12) is kept in communication with the heat exchange chamber (3) through the sliding tube (10).

4. The cold start heat exchange device for a hydrogen fuel cell according to claim 3, characterized in that: Two sets of movable plugs (6) are slidably arranged inside the expansion cavity (12). The minimum distance between the two sets of movable plugs (6) is greater than the diameter of the sliding tube (10). The two sets of movable plugs (6) are located on both sides of the sliding tube (10).

5. A cold start heat exchange device for a hydrogen fuel cell according to claim 4, characterized in that: The heat exchange section (4) and the storage section (1) are connected by a reset assembly.

6. A cold start heat exchange device for a hydrogen fuel cell according to claim 5, characterized in that: The reset assembly includes a connecting bolt (8) and a reset spring (9). One end of the connecting bolt (8) is disposed on the heat exchange section (4), and the other end slides inside the storage section (1). The reset spring (9) is fitted on the connecting bolt (8) and disposed inside the storage section (1).

7. A cold start heat exchange device for a hydrogen fuel cell according to claim 6, characterized in that: The medium driving component (5) is a movable column that passes through one end face of the receiving part (1) and slides inside the heat exchange chamber (3).

8. A cold start heat exchange device for a hydrogen fuel cell according to claim 7, characterized in that: The diameter of the moving column is smaller than the aperture of the heat exchange cavity (3).

9. A cold start heat exchange device for a hydrogen fuel cell according to claim 8, characterized in that: The sliding tube (10) is located in the middle of the heat exchange section (4).

10. A cold-start heat exchange device for a hydrogen fuel cell according to any one of claims 1-9, characterized in that: The heat exchange medium is a solid-liquid phase change material (PCM) coupled with a PTC.

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