Electric leakage protection device for fuel cell stack

Abstract

The utility model discloses a fuel cell electric pile electric leakage protection device, which relates to the technical field of fuel cells and comprises an outer shell with an opening at the top, an end plate, an electric pile, a first electric leakage protection component and a second electric leakage protection component, second electric leakage protection assemblies used for separating the electric pile from the outer shell are installed on the two sides of the electric pile correspondingly, first electric leakage protection assemblies are installed at the front end and the rear end of the electric pile correspondingly, and end plates are installed at the ends of the first electric leakage protection assemblies. The first electric leakage protection assembly comprises a first polypropylene insulating plate with the same shape as the end part of the electric pile, and a polyurethane insulating sealing sheet is arranged between the first polypropylene insulating plate and the electric pile. The problems that an existing fuel cell is installed in a protection shell and is not provided with an electric leakage protection structure, electric leakage of the fuel cell is easily and directly conducted to the outside of the shell, and then potential safety hazards are caused are solved.

Description

Technical Field

[0001] This utility model relates to the field of fuel cell technology, specifically to a fuel cell stack leakage protection device. Background Technology

[0002] A fuel cell is a chemical device that directly converts the chemical energy of fuel into electrical energy; it is also known as an electrochemical generator.

[0003] For example, Chinese Utility Model Patent Publication No. CN210092228U discloses a heat dissipation protective shell for a fuel cell, including an outer shell and a fuel cell. The fuel cell is installed inside the outer shell, and air guide plates are inserted into the inner walls of two sides of the outer shell. Air ducts are provided on the surface of the air guide plates on the inner side of the outer shell, and a movable cover is fixedly installed on the other side of the air guide plates on the outer surface of the outer shell by mounting screws. A cooling fan is installed inside the movable cover, and the cooling fan is electrically connected to an external power source through a circuit. The movable cover is fixedly installed on two sides of the outer shell by screws, and the cooling fan is installed inside the movable cover. When the cooling fan is turned on, the cooling fan draws air into the outer shell through the air guide plates embedded in the outer shell. Multiple columnar air ducts are provided through the surface of the air guide plates, which can disperse the blown air, thereby causing the air to be blown evenly onto the fuel cell through multiple air ducts as air outlets, improving the range and effect of heat dissipation.

[0004] The existing fuel cells are installed inside a protective casing, which improves heat dissipation, but the casing lacks a leakage protection structure. When the fuel cell leaks current, the current can easily be directly conducted to the outside of the casing, posing a safety hazard. Therefore, it does not meet the current requirements, and a fuel cell stack leakage protection device is proposed. Utility Model Content

[0005] The purpose of this utility model is to provide a fuel cell stack leakage protection device to solve the problem mentioned in the background art that the existing fuel cells are installed in the protective shell and do not have a leakage protection structure. When the fuel cell leaks current, it can be easily conducted directly to the outside of the shell, thus causing safety hazards.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a fuel cell stack leakage protection device, comprising: a top-opening outer shell, an end plate, a fuel cell stack, a first leakage protection component, and a second leakage protection component. The fuel cell stack is installed inside the outer shell. Second leakage protection components for separating the fuel cell stack from the outer shell are installed on both sides of the fuel cell stack. First leakage protection components are installed at both the front and rear ends of the fuel cell stack. An end plate is installed at the end of the first leakage protection component.

[0007] Preferably, the first leakage protection component includes a first polypropylene insulating plate with the same shape as the end of the fuel cell stack, and a polyurethane insulating seal is disposed between the first polypropylene insulating plate and the fuel cell stack.

[0008] Preferably, the second leakage protection component includes side limiting seats installed on the inner walls of both sides of the housing, a strip-shaped second polypropylene insulating plate installed on the outer wall of the side limiting seats, and a rubber pad installed on the outer wall of the second polypropylene insulating plate.

[0009] Preferably, an aluminum nitride ceramic liquid cooling plate is installed below the fuel cell stack, a plurality of lower slots are provided at the bottom of the outer casing, a plurality of heat dissipation fins are provided on the lower surface of the aluminum nitride ceramic liquid cooling plate, the heat dissipation fins extend to the outside of the lower slots, and a sealing strip is provided between the heat dissipation fins and the lower slots.

[0010] Preferably, mounting bases are installed on both sides of the bottom of the outer casing, a plurality of second mounting ports are provided on the upper surface of the outer casing, and an upper cover plate is installed on the upper part of the outer casing by bolts. Two flip covers are installed on the outer wall of the upper cover plate, and pole assembly ports are installed inside the flip covers.

[0011] Preferably, both the outer shell and the upper cover plate have several first assembly ports at their ends, and the end plates are assembled with the first assembly ports by bolts.

[0012] Preferably, the end plate includes an outer frame body, an inner assembly plate is installed at the middle position of the outer frame body, two symmetrical air pipe assembly ports are opened on the outer wall of the inner assembly plate, a vent hole is provided above the air pipe assembly port, and a liquid pipe assembly port is provided below the air pipe assembly port of only one of the two end plates.

[0013] Preferably, the aluminum nitride ceramic liquid cooling plate has two sets of liquid inlet and outlet pipes installed on its end wall. The liquid inlet and outlet pipes pass through the first leakage protection component and extend into the liquid pipe assembly port. The fuel cell stack includes current collectors located on its outer walls at both ends. Positive and negative terminals are provided on the upper surface of the current collectors and extend into the flip cover. Gas inlet and outlet pipes are installed on the end wall of the current collectors. The gas inlet and outlet pipes pass through the first leakage protection component and extend into the gas pipe assembly port.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] (1) This utility model improves the safety against leakage current by installing a first leakage protection component between the end of the fuel cell stack and the external end plate. The first leakage protection component consists of a first polypropylene insulating board and a polyurethane insulating seal. The polyurethane insulating seal is placed close to the fuel cell stack on the inner side of the first polypropylene insulating board. Its excellent elastic deformation characteristics can effectively fill the assembly gap, forming the first insulating barrier while achieving high sealing performance. The first polypropylene insulating board, with its high-temperature structural stability, outstanding impact resistance and tear resistance, maintains structural integrity when subjected to system operating pressure load, avoiding insulation failure due to deformation. The composite insulating shield layer formed by the synergistic effect of the two creates a reliable insulating isolation space between the fuel cell stack and the outer casing, significantly reducing the possibility of leakage current risk being conducted to the outer casing. The dual protection mechanism improves the overall safety performance of the equipment.

[0016] (2) The second leakage protection component constructed on both sides of the fuel cell stack in this utility model includes a second polypropylene insulating plate and a rubber pad disposed on the outer wall of the second polypropylene insulating plate. Wherein: the rubber pad is disposed in close contact with the side of the fuel cell stack as a contact layer. Its elastic deformation characteristics can both compensate for assembly tolerances to form a flexible sealing interface and absorb mechanical impact energy through dynamic buffering. The second polypropylene insulating plate is disposed on the outside of the rubber pad as a support layer. The two work together to achieve stress dispersion and deformation compensation, significantly improving the lateral leakage protection level. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the internal structure of the outer shell of this utility model;

[0019] Figure 3 This is a front perspective view of the outer casing of this utility model;

[0020] Figure 4 This is a bottom view of the end plate of this utility model;

[0021] Figure 5 This is an overall bottom view of the present invention;

[0022] Figure 6 This is a schematic diagram of the lower slotted structure of this utility model;

[0023] Figure 7 This is a schematic diagram of the pole assembly port structure of this utility model;

[0024] In the diagram: 1. Outer shell; 101. Assembly base; 102. First assembly port; 103. Second assembly port; 104. Lower slot; 105. Sealing strip; 2. Upper cover plate; 201. Flip cover; 202. Terminal assembly port; 3. End plate; 301. Outer frame; 302. Inner assembly plate; 303. Gas pipe assembly port; 304. Liquid pipe assembly port; 305. Vent hole; 4. Fuel cell stack; 401. Current collector plate; 402. Gas inlet / outlet pipe; 403. Positive and negative terminals; 5. First leakage protection component; 501. First polypropylene insulation board; 502. Polyurethane insulation seal; 6. Second leakage protection component; 601. Side limiting seat; 602. Second polypropylene insulation board; 603. Rubber pad; 7. Aluminum nitride ceramic liquid cooling plate; 701. Heat dissipation fins; 702. Liquid inlet / outlet pipe. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] Please see Figure 1 , Figure 2 This utility model provides an embodiment of a fuel cell stack leakage protection device, comprising: a top-opening outer shell 1, an end plate 3, a fuel cell stack 4, a first leakage protection component 5, and a second leakage protection component 6. Two sets of mounting seats 101 are installed on both sides of the bottom of the outer shell 1. The fuel cell stack 4 is installed inside the outer shell 1. The second leakage protection component 6 for separating the fuel cell stack 4 from the outer shell 1 is installed on both sides of the fuel cell stack 4. The first leakage protection component 5 is installed at both the front and rear ends of the fuel cell stack 4. The end of the first leakage protection component 5 is equipped with an end plate 3. The first leakage protection component 5 includes a first polypropylene insulating plate 501 with the same shape as the end of the fuel cell stack 4. A polyurethane insulating seal 502 is provided between the first polypropylene insulating plate 501 and the fuel cell stack 4.

[0027] A first leakage current protection component 5 is installed between the end of the fuel cell stack 4 and the external end plate 3. The first leakage current protection component 5 consists of a first polypropylene insulating plate 501 and a polyurethane insulating seal 502. The polyurethane insulating seal 502 is set close to the fuel cell stack 4 on the inner side of the first polypropylene insulating plate 501. Its excellent elastic deformation characteristics can effectively fill the assembly gap, forming the first insulation barrier while achieving high sealing performance. The first polypropylene insulating plate 501, with its high-temperature structural stability, outstanding impact resistance and tear resistance, maintains structural integrity when subjected to system operating pressure loads, avoiding insulation failure due to deformation. The composite insulating shield layer formed by the synergistic effect of the two creates a reliable insulating isolation space between the fuel cell stack 4 and the outer casing 1, significantly reducing the possibility of leakage current being conducted to the outer casing 1. This dual protection mechanism improves the overall safety performance of the equipment.

[0028] Please see Figure 2 , Figure 3 The second leakage protection component 6 includes a side limiting seat 601 installed on the inner walls of both sides of the housing 1. A strip-shaped second polypropylene insulating plate 602 is installed on the outer wall of the side limiting seat 601, and a rubber pad 603 is installed on the outer wall of the second polypropylene insulating plate 602.

[0029] The rubber pad 603 is set as a contact layer in close contact with the side of the fuel cell stack 4. Its elastic deformation characteristics can not only compensate for assembly tolerances to form a flexible sealing interface, but also absorb mechanical impact energy through dynamic buffering. The second polypropylene insulation board 602 is set as a support layer on the outside of the rubber pad 603. The two work together to achieve stress dispersion and deformation compensation, significantly improving the lateral leakage protection level.

[0030] Please see Figure 3 , Figure 5 , Figure 6 An aluminum nitride ceramic liquid cooling plate 7 is installed below the fuel cell stack 4. Several lower slots 104 are provided at the bottom of the outer casing 1. Several heat dissipation fins 701 are provided on the lower surface of the aluminum nitride ceramic liquid cooling plate 7. The heat dissipation fins 701 extend to the outside of the lower slots 104. A sealing strip 105 is provided between the heat dissipation fins 701 and the lower slots 104.

[0031] The bottom of the fuel cell stack 4 uses a liquid cooling plate, which is common in the field, for heat dissipation. The liquid cooling plate is made of aluminum nitride ceramic material, which has good insulation and thermal conductivity, and can improve the insulation effect of the bottom of the fuel cell stack 4. The aluminum nitride ceramic liquid cooling plate 7 cools the fuel cell stack 4. The heat dissipation fins 701 facilitate heat dissipation at the aluminum nitride ceramic liquid cooling plate 7. The lower slot 104 facilitates the insertion of the heat dissipation fins 701 to the outside, which is convenient for heat exchange with the outside air. The sealing strip 105 is used to seal the gap between the heat dissipation fins 701 and the lower slot 104 to ensure that external impurities do not enter the interior.

[0032] Please see Figure 1 , Figure 3 , Figure 4 , Figure 7 The upper surface of the outer casing 1 is provided with several second assembly ports 103. The upper cover plate 2 is bolted to the top of the outer casing 1. Two flip covers 201 are installed on the outer wall of the upper cover plate 2. The inside of the flip cover 201 is provided with the pole assembly port 202. The ends of the outer casing 1 and the upper cover plate 2 are provided with several first assembly ports 102. The end plate 3 is assembled with the first assembly ports 102 by bolts. The first assembly ports 102 facilitate the assembly of the end plate 3 with the outer casing 1. The second assembly ports 103 facilitate the user to assemble the upper cover plate 2 with the outer casing 1. The flip covers 201 protect the pole assembly port 202.

[0033] Please see Figure 3 , Figure 4 The end plate 3 includes an outer frame 301, with an inner assembly plate 302 installed in the middle of the outer frame 301. Two symmetrical air pipe assembly ports 303 are opened on the outer wall of the inner assembly plate 302. A vent hole 305 is provided above each air pipe assembly port 303. Only one of the end plates has a liquid pipe assembly port 304 below its air pipe assembly port 303. Two sets of liquid inlet / outlet pipes 702 are installed on the end wall of the aluminum nitride ceramic liquid cooling plate 7. The liquid inlet / outlet pipes 702 penetrate the first leakage protection component 5 and extend into the liquid pipe assembly port 304. The fuel cell stack 4 includes current collector plates 401 located on its two outer walls. Positive and negative terminals 403 are provided on the upper surface of the current collector plates 401. 3. Extending into the flip cover 201, a gas inlet / outlet pipe 402 is installed on the end wall of the current collector plate 401. The gas inlet / outlet pipe 402 passes through the first leakage protection component 5 and extends into the gas pipe assembly port 303. The liquid inlet / outlet pipe 702 is used for the inlet and outlet of coolant, respectively. The current collector plate 401 is used to collect and conduct current, so that the current of the fuel cell stack 4 is transmitted to the positive and negative terminals 403 for use by external equipment. The gas inlet / outlet pipe 402 is used for the inlet and outlet of hydrogen and oxygen required by the fuel cell. Both the gas inlet / outlet pipe 402 and the liquid inlet / outlet pipe 702 are connected to the external pipeline through the gas pipe assembly port 303 and the liquid pipe assembly port 304 on the inner assembly plate 302, which facilitates the input and output of the corresponding gas and liquid.

[0034] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A fuel cell stack leakage protection device, comprising a top-opening outer shell (1), an end plate (3), a fuel cell stack (4), a first leakage protection component (5), and a second leakage protection component (6), characterized in that: The inside of the outer casing (1) is equipped with an electric stack (4). On both sides of the electric stack (4), a second leakage protection component (6) is installed to separate the electric stack (4) from the outer casing (1). A first leakage protection component (5) is installed at both the front and rear ends of the electric stack (4), and an end plate (3) is installed at the end of each of the first leakage protection components (5).

2. The fuel cell stack leakage protection device according to claim 1, characterized in that: The first leakage protection component (5) includes a first polypropylene insulating plate (501) with the same shape as the end of the stack (4), and a polyurethane insulating seal (502) is provided between the first polypropylene insulating plate (501) and the stack (4).

3. The fuel cell stack leakage protection device according to claim 1, characterized in that: The second leakage protection component (6) includes a side limiting seat (601) installed on the inner walls of both sides of the outer casing (1), a long strip of second polypropylene insulation board (602) is installed on the outer wall of the side limiting seat (601), and a rubber pad (603) is installed on the outer wall of the second polypropylene insulation board (602).

4. The fuel cell stack leakage protection device according to claim 1, characterized in that: An aluminum nitride ceramic liquid cooling plate (7) is installed below the fuel cell stack (4). Several lower slots (104) are provided at the bottom of the outer shell (1). Several heat dissipation fins (701) are provided on the lower surface of the aluminum nitride ceramic liquid cooling plate (7). The heat dissipation fins (701) extend to the outside of the lower slots (104). A sealing strip (105) is provided between the heat dissipation fins (701) and the lower slots (104).

5. The fuel cell stack leakage protection device according to claim 4, characterized in that: The outer casing (1) has mounting bases (101) installed on both sides of the bottom. The upper surface of the outer casing (1) has several second mounting ports (103). The upper cover plate (2) is installed on the upper part of the outer casing (1) by bolts. Two flip covers (201) are installed on the outer wall of the upper cover plate (2). The inside of the flip cover (201) is equipped with a pole assembly port (202).

6. The fuel cell stack leakage protection device according to claim 5, characterized in that: The outer shell (1) and the upper cover plate (2) are provided with multiple first assembly ports (102) at their ends, and the end plate (3) is assembled with the first assembly ports (102) by bolts.

7. The fuel cell stack leakage protection device according to claim 6, characterized in that: The end plate (3) includes an outer frame body (301), and an inner assembly plate (302) is installed at the middle position of the outer frame body (301). Two tracheal assembly ports (303) are symmetrically opened on the outer wall of the inner assembly plate (302). A vent hole (305) is provided above the tracheal assembly port (303). Among the two end plates, only one of the end plates has a liquid pipe assembly port (304) below the tracheal assembly port (303).

8. The fuel cell stack leakage protection device according to claim 7, characterized in that: Two sets of liquid inlet and outlet pipes (702) are installed on the end wall of the aluminum nitride ceramic liquid cooling plate (7). The liquid inlet and outlet pipes (702) penetrate the first leakage protection component (5) and extend into the liquid pipe assembly port (304). The fuel cell stack (4) includes a current collector plate (401) located on the outer wall at both ends. Positive and negative terminals (403) are provided on the upper surface of the current collector plate (401). The positive and negative terminals (403) extend into the terminal assembly port (202). A gas inlet and outlet pipe (402) is installed on the end wall of the current collector plate (401). The gas inlet and outlet pipe (402) penetrates the first leakage protection component (5) and extends into the gas pipe assembly port (303).

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