Small circulation device for cold start test of hydrogen fuel cell stack

Abstract

The utility model discloses a hydrogen fuel cell stack cold start test small circulation device. The device comprises a water supply temperature sensor and a pressure sensor which are arranged at a water supply port of a tested stack; the return water temperature sensor and the pressure sensor are arranged at a water return port of the tested galvanic pile; the large-circulation one-way valve is arranged at a water supply port of the tested pile and connected with a large-circulation water supply end; a tested stack water return port is connected with a large circulation water return end; an inert gas supply end is connected with a tested galvanic pile water supply port through a secondary refrigerant recovery air inlet valve and is connected with the top of the volume adjusting tank through an adjusting tank air inlet valve; the bottom of the volume adjusting tank is connected with a tested galvanic pile water supply port through a small circulation one-way valve; the flowmeter is arranged at the outlet of the small circulating water pump; the liquid level sensor is arranged in the volume adjusting tank; the gas path communicating valve is connected between the top of the volume adjusting tank and the top of the recovery liquid storage tank; the liquid path communicating valve is connected between the bottom of the volume adjusting tank and the bottom of the recovery liquid storage tank; and the top of the recovery liquid storage tank is also connected with a tested galvanic pile water return port and is provided with an emptying valve.

Description

Technical Field

[0001] The utility model relates to the field of testing, in particular to a small circulation device for cold start testing of a hydrogen fuel cell stack. Background Art

[0002] A hydrogen fuel cell is a power generation device that directly converts the chemical energy of hydrogen and oxygen into electrical energy. The stack is the place where hydrogen and oxygen react. A very important test item in the development of the stack is to verify the starting performance under low temperature conditions. The starting performance is related to the rate of change of water temperature in the stack heat dissipation water circuit, and the rate of change of water temperature is related to the water volume. The smaller the water volume, the easier it is to start the stack. However, to meet the heat dissipation requirements of the stack when running at full load, a larger coolant flow is required. The larger the flow, the larger the required pipeline diameter, and the corresponding pipeline water volume is also larger. Therefore, there is a contradiction between the volume requirements of the startup process and the full-load operation process. To solve this problem, a small circulation system with a smaller volume is generally configured for the cold start test. The small circulation system is used for heat dissipation at the beginning, and then switched to the large circulation system after starting to a certain extent.

[0003] In the battery stack test, the heat dissipation of battery stacks with different powers is different, so the corresponding water channel volumes are also quite different. When the test device is configured according to the heat dissipation power of the small-power battery stack, the heat dissipation is insufficient when testing the large-power battery stack. When the test device is configured according to the heat dissipation power of the large-power battery stack, the cold start test of the small-power battery stack will cause a startup failure due to the slow temperature rise. Therefore, the same set of battery stack cold start test devices in the prior art cannot take into account the testing requirements of large and small battery stacks.

[0004] In order to overcome the different requirements of cold start tests of large and small fuel cells for the volume of small circulation systems, the current conventional practice is to configure multiple sets of small circulation systems of different sizes and select different test equipment according to the requirements of the fuel cell. However, this method is costly on the one hand, and multiple sets of equipment occupy a large amount of space in the environmental chamber on the other hand, resulting in limited test space. Utility Model Content

[0005] A series of simplified concepts are introduced in the utility model content section, which are all simplifications of the prior art in the field, which will be further described in detail in the specific implementation section. The utility model content section of the utility model does not mean to attempt to define the key features and necessary technical features of the technical solution claimed for protection, nor does it mean to attempt to determine the scope of protection of the technical solution claimed for protection.

[0006] The technical problem to be solved by the utility model is to provide a small circulation device for cold start test of hydrogen fuel cell stack which can simultaneously meet the cold start and heat dissipation requirements of stacks with different powers and can recycle the coolant.

[0007] In order to solve the above technical problems, the utility model provides a small cycle device for cold start test of hydrogen fuel cell stack, comprising:

[0008] The water supply temperature sensor 1 and the water supply pressure sensor 2 are arranged at the water supply port of the tested battery stack 3;

[0009] The return water temperature sensor 4 and the return water pressure sensor 5 are arranged at the return water inlet of the tested stack 3;

[0010] A large circulation one-way valve 6 is arranged at the water supply port of the tested battery stack 3 and connected to a large circulation water supply terminal 7;

[0011] The water return port of the tested battery stack 3 is connected to the large circulation water return terminal 8;

[0012] The inert gas supply end 9 is connected to the water supply port of the tested stack 3 through the coolant recovery air intake valve 10, and is connected to the top of the volume regulating tank 12 through the regulating tank air intake valve 11;

[0013] A small circulation water pump 13 is connected to the bottom of the volume regulating tank 12, and is connected to the water supply port of the tested stack 3 through a small circulation one-way valve 14;

[0014] A flow meter 15 is provided at the outlet of the small circulating water pump 13;

[0015] A liquid level sensor 16 is disposed in the volume regulating tank 12;

[0016] The gas circuit connecting valve 17 is connected between the top of the volume regulating tank 12 and the top of the recovery liquid storage tank 19;

[0017] A liquid circuit connecting valve 18 is connected between the bottom of the volume regulating tank 12 and the bottom of the recovery liquid storage tank 19;

[0018] The top of the recovery liquid storage tank 19 is also connected to the water return port of the tested battery stack 3, and a drain valve 20 is provided on the top of the recovery liquid storage tank 19.

[0019] Preferably, the small circulation device for cold start test of hydrogen fuel cell stack is further improved, and the inert gas supply end 9 supplies nitrogen.

[0020] Preferably, the small circulation device for cold start test of hydrogen fuel cell stack is further improved, and the upper half of volume regulating tank 12 is provided with orifice plate 12.1, and the orifice plate in the upper half of volume regulating tank 12 can evenly distribute the return water of return pipe to the bottom.

[0021] Preferably, the small circulation device for cold start test of hydrogen fuel cell stack is further improved, and further comprises: a water temperature regulating valve 21 which is arranged at the large circulation water supply end 7, and which is respectively connected to the large circulation one-way valve 6 and the large circulation return water end 8.

[0022] The working principle and technical effects of the utility model are as follows:

[0023] 1. By installing a one-way valve at the inlet of the small circulation and large circulation pipeline stack respectively, the large and small circulations will not interfere with each other. When the small circulation is turned on, the medium in the large circulation pipeline will not enter the large circulation due to the obstruction of the large circulation one-way valve. After switching to the large circulation, the medium in the large circulation pipeline can directly flow into the tested stack, realizing seamless switching between the large circulation and the small circulation.

[0024] 2. In order to adjust the volume of the small circulation loop, a volume regulating tank is connected in series in the small circulation system pipeline. The regulating tank has multiple interfaces, a nitrogen inlet on the top and an interface connected to the recovery liquid storage tank. A regulating valve is installed on each interface. There is an interface at the bottom connected to the small circulation water pump, and another interface is connected to the antifreeze recovery liquid storage tank. A regulating valve is installed between the bottom of the volume regulating tank and the bottom of the recovery liquid storage tank to control the connection of the liquid paths of the two tanks.

[0025] When adjusting the volume, if the volume of the small circulation loop needs to be increased, open the gas circuit connecting valve and the liquid circuit connecting valve. Due to the pressure balance, the coolant will enter the regulating tank from the liquid storage tank. The liquid level sensor in the regulating tank detects the liquid level in the tank in real time. The volume of the coolant in the tank can be calculated by the liquid level height. Adding the volume of the small circulation pipeline and the volume of the stack can get the total volume of the small circulation system. When the total volume reaches the target volume, close the gas circuit connecting valve and the liquid circuit connecting valve. When the volume of the small circulation system needs to be reduced, the regulating tank air inlet valve, the liquid circuit connecting solenoid valve and the vent valve on the top of the recovery liquid storage tank are all opened, and the coolant in the regulating tank is squeezed into the liquid storage tank by nitrogen extrusion. When the total volume reaches the target volume, close the regulating tank air inlet valve, the liquid circuit connecting solenoid valve and the vent valve on the top of the recovery liquid storage tank.

[0026] 3. When the experiment is completed, in order to reduce the waste of coolant (ethylene glycol), all manual valves at the connection between the small loop and the large loop and the fuel cell stack can be closed, and the coolant recovery inlet valve, coolant recovery outlet valve and the drain valve on the top of the recovery tank can be opened. The coolant in the fuel cell stack and the pipeline can be recovered to the recovery tank through N2 purging, which can reduce the waste of coolant and also reduce the pollution of the coolant to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings of the present utility model are intended to illustrate the general characteristics of the methods, structures and / or materials used in specific exemplary embodiments of the present utility model, and to supplement the description in the specification. However, the drawings of the present utility model are schematic diagrams not drawn to scale, and thus may not accurately reflect the precise structure or performance characteristics of any given embodiment. The drawings of the present utility model should not be interpreted as limiting or restricting the range of values ​​or properties covered by the exemplary embodiments of the present utility model. The present utility model is further described in detail below in conjunction with the drawings and specific embodiments:

[0028] Figure 1It is a schematic structural diagram of the first embodiment of the utility model.

[0029] Figure 2 It is a schematic structural diagram of the first embodiment of the utility model.

[0030] Description of Reference Numerals

[0031] Water supply temperature sensor 1

[0032] Water supply pressure sensor 2

[0033] Tested battery stack 3

[0034] Return water temperature sensor 4

[0035] Return water pressure sensor 5

[0036] Large circulation check valve 6

[0037] Large circulation water supply end 7

[0038] Large circulation return water end 8

[0039] Inert gas supply port 9

[0040] Coolant recovery intake valve 10

[0041] Regulating tank air inlet valve 11

[0042] Volume adjustment tank 12

[0043] Small circulating water pump 13

[0044] Small circulation check valve 14

[0045] Flow meter 15,

[0046] Liquid level sensor 16

[0047] Gas line connecting valve 17

[0048] Liquid circuit connecting valve 18

[0049] Recycling tank 19

[0050] Drain valve 20

[0051] Water temperature regulating valve 21. DETAILED DESCRIPTION

[0052] The following is an explanation of the implementation of the utility model by specific specific embodiments, and those skilled in the art can fully understand the other advantages and technical effects of the utility model from the content disclosed in this specification. The utility model can also be implemented or applied through different specific embodiments, and the details in this specification can also be applied based on different viewpoints, and various modifications or changes can be made without deviating from the general design concept of the utility model. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. The following exemplary embodiments of the utility model can be implemented in a variety of different forms and should not be interpreted as being limited to the specific embodiments described here. It should be understood that these embodiments are provided to make the disclosure of the utility model thorough and complete, and to fully convey the technical solutions of these exemplary specific embodiments to those skilled in the art. It should be understood that when an element is referred to as "connected" or "coupled" to another element, the element can be directly connected or coupled to another element, or there can be an intermediate element. The difference is that when an element is referred to as "directly connected" or "directly coupled" to another element, there is no intermediate element. In all the drawings, the same reference numerals always represent the same element.

[0053] First embodiment;

[0054] refer to Figure 1 As shown, the utility model provides a small cycle device for cold start test of hydrogen fuel cell stack, comprising:

[0055] The water supply temperature sensor 1 and the water supply pressure sensor 2 are arranged at the water supply port of the tested battery stack 3;

[0056] The return water temperature sensor 4 and the return water pressure sensor 5 are arranged at the return water inlet of the tested stack 3;

[0057] A large circulation one-way valve 6 is arranged at the water supply port of the tested battery stack 3 and connected to a large circulation water supply terminal 7;

[0058] The water return port of the tested battery stack 3 is connected to the large circulation water return terminal 8;

[0059] The inert gas supply end 9 is connected to the water supply port of the tested stack 3 through the coolant recovery air intake valve 10, and is connected to the top of the volume regulating tank 12 through the regulating tank air intake valve 11;

[0060] A small circulation water pump 13 is connected to the bottom of the volume regulating tank 12, and is connected to the water supply port of the tested stack 3 through a small circulation one-way valve 14;

[0061] A flow meter 15 is provided at the outlet of the small circulating water pump 13;

[0062] A liquid level sensor 16 is disposed in the volume regulating tank 12;

[0063] The gas circuit connecting valve 17 is connected between the top of the volume regulating tank 12 and the top of the recovery liquid storage tank 19;

[0064] A liquid circuit connecting valve 18 is connected between the bottom of the volume regulating tank 12 and the bottom of the recovery liquid storage tank 19;

[0065] A recovery liquid storage tank 19, the top of which is also connected to the water return port of the tested battery stack 3, and a drain valve 20 is provided on the top;

[0066] The inert gas supply end 9 supplies nitrogen.

[0067] The first embodiment is further improved by providing an orifice plate 12 . 1 on the upper half of the volume regulating tank 12 .

[0068] In addition, it should be understood that, although the terms "first", "second", etc. can be used here to describe different elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the exemplary embodiments of the present utility model, the first element, component, region, layer or part discussed below may also be referred to as the second element, component, region, layer or part.

[0069] Second embodiment;

[0070] refer to Figure 2 As shown, the utility model provides a small cycle device for cold start test of hydrogen fuel cell stack, comprising:

[0071] The water supply temperature sensor 1 and the water supply pressure sensor 2 are arranged at the water supply port of the tested battery stack 3;

[0072] The return water temperature sensor 4 and the return water pressure sensor 5 are arranged at the return water inlet of the tested stack 3;

[0073] A large circulation one-way valve 6 is arranged at the water supply port of the tested battery stack 3 and connected to a large circulation water supply terminal 7;

[0074] The water return port of the tested battery stack 3 is connected to the large circulation water return terminal 8;

[0075] The inert gas supply end 9 is connected to the water supply port of the tested stack 3 through the coolant recovery air intake valve 10, and is connected to the top of the volume regulating tank 12 through the regulating tank air intake valve 11;

[0076] A small circulation water pump 13 is connected to the bottom of the volume regulating tank 12, and is connected to the water supply port of the tested stack 3 through a small circulation one-way valve 14;

[0077] A flow meter 15 is provided at the outlet of the small circulating water pump 13;

[0078] A liquid level sensor 16 is disposed in the volume regulating tank 12;

[0079] The gas circuit connecting valve 17 is connected between the top of the volume regulating tank 12 and the top of the recovery liquid storage tank 19;

[0080] A liquid circuit connecting valve 18 is connected between the bottom of the volume regulating tank 12 and the bottom of the recovery liquid storage tank 19;

[0081] A recovery liquid storage tank 19, the top of which is also connected to the water return port of the tested battery stack 3, and a drain valve 20 is provided on the top;

[0082] The water temperature regulating valve 21 is arranged at the large circulation water supply end 7, and is respectively connected to the large circulation check valve 6 and the large circulation water return end 8;

[0083] The inert gas supply end 9 supplies nitrogen.

[0084] The first embodiment is further improved by providing an orifice plate 12 . 1 on the upper half of the volume regulating tank 12 .

[0085] Unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. It will also be understood that, unless explicitly defined herein, terms such as those defined in general dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant field, and not interpreted in an ideal or overly formal sense.

[0086] The present invention is described in detail above through specific implementation methods and examples, but these do not constitute limitations of the present invention. Without departing from the principle of the present invention, those skilled in the art may make many modifications and improvements, which should also be considered as the protection scope of the present invention.

Claims

1. A small cycle device for cold start test of hydrogen fuel cell stack, characterized in that: include: A water supply temperature sensor (1) and a water supply pressure sensor (2) are arranged at the water supply port of the tested battery stack (3); A return water temperature sensor (4) and a return water pressure sensor (5) are arranged at the return water inlet of the tested battery stack (3); A large circulation one-way valve (6), which is arranged at the water supply port of the tested battery stack (3) and connected to the large circulation water supply end (7); The water return port of the tested battery stack (3) is connected to the large circulation water return end (8); The inert gas supply end (9) is connected to the water supply port of the tested stack (3) via the coolant recovery air intake valve (10), and is connected to the top of the volume regulating tank (12) via the regulating tank air intake valve (11); A small circulation water pump (13) is connected to the bottom of the volume regulating tank (12) and is connected to the water supply port of the tested battery stack (3) via a small circulation one-way valve (14); A flow meter (15) is arranged at the outlet of the small circulating water pump (13); A liquid level sensor (16) is arranged in the volume regulating tank (12); A gas circuit connecting valve (17) connected between the top of the volume regulating tank (12) and the top of the recovery liquid storage tank (19); A liquid circuit connecting valve (18) connected between the bottom of the volume regulating tank (12) and the bottom of the recovery liquid storage tank (19); The top of the recovery liquid storage tank (19) is also connected to the water return port of the tested battery stack (3), and a drain valve (20) is provided on the top of the recovery liquid storage tank (19).

2. The hydrogen fuel cell stack cold start test small cycle device as claimed in claim 1, characterized in that: The inert gas supply terminal (9) supplies nitrogen gas.

3. The hydrogen fuel cell stack cold start test small cycle device as claimed in claim 1, characterized in that: The upper half of the volume regulating tank (12) is provided with a perforated plate (12.1).

4. The hydrogen fuel cell stack cold start test small cycle device as claimed in claim 1, characterized in that: Also includes: The water temperature regulating valve (21) is arranged at the large circulation water supply end (7), and is respectively connected to the large circulation check valve (6) and the large circulation water return end (8).

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