A submerged fuel cell cooling device and thermal management system thereof

Abstract

The present application discloses an immersion fuel cell cooling device and a thermal management system thereof, which relate to the technical field of thermal management of power batteries, the device comprising: a first coolant is arranged in an immersion cavity formed by a cooling box, and the fuel cell is immersed in the first coolant; a self-suction component comprises a suction box and a suction piece, the suction box is arranged in the immersion cavity, and a second coolant is arranged therein, one end of the suction piece is located in the suction box, and the other end is located outside the cooling box; a cooling loop is arranged on the outer wall of the cooling box, and the cooling loop is connected with the interior of the suction box through a guide channel; the heat generated by the operation of the fuel cell will be absorbed by the first coolant, and when its temperature reaches the boiling point, steam will be generated, and the steam pressure acts on the suction piece to move it upward, so that negative pressure is formed inside the suction box, and the second coolant is sucked into the cooling loop to cool down the outer wall of the cooling box; the cooling box and the fuel cell are evenly dissipated, no power structure needs to be added, extra energy consumption is saved, and the heat dissipation effect is remarkable.

Description

Technical Field

[0001] The present application generally relates to the technical field of thermal management of power batteries, and specifically to an immersion fuel cell cooling device and a thermal management system thereof. Background Art

[0002] As one of the driving sources of new energy vehicles, the performance of proton exchange membrane fuel cells (PEMFC) is significantly affected by the operating temperature. Too high a temperature will lead to catalyst deactivation and membrane electrolyte failure, while too low a temperature will reduce the reaction rate and conductivity, reduce energy conversion efficiency, and even cause flooding. In addition, although the energy conversion efficiency of PEMFC is as high as 55%, half of the energy is still converted into heat. This heat must be removed from the inside of PEMFC through effective heat dissipation to prevent it from affecting the operation of the fuel cell. In addition, since the reaction inside PEMFC is not uniform, this will cause its heat generation area to be uneven, which increases the difficulty of precise temperature control of PEMFC.

[0003] Existing fuel cells use immersion cooling to achieve phase change and achieve a uniform temperature effect. However, an additional cooling device is required, which not only increases the volume of the cooling system but also increases energy consumption. Therefore, we propose an immersion fuel cell cooling device and its thermal management system to solve the above problems. Summary of the invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide an immersion fuel cell cooling device and a thermal management system thereof which have no additional losses, significant heat dissipation effect and simple structure.

[0005] In a first aspect, the present application provides an immersed fuel cell cooling device, comprising:

[0006] A cooling box, wherein the interior of the cooling box is hollow to form an immersion cavity, a first coolant is provided in the immersion cavity, and the fuel cell is immersed in the first coolant;

[0007] A self-suction component, the self-suction component comprising a suction box and a suction piece, the suction box being arranged in the immersion cavity, and having a second coolant therein, wherein the second coolant has a boiling point greater than that of the first coolant; the suction piece movably passes through the top of the suction box and the top of the cooling box, with one end of the suction piece being located in the suction box and the other end being located outside the cooling box;

[0008] A cooling ring pipe, the cooling ring pipe is arranged on the outer wall of the cooling box, and the cooling ring pipe is connected with the interior of the suction box through a guide channel;

[0009] The heat generated by the operation of the fuel cell will be absorbed by the first coolant. When the temperature of the first coolant reaches the boiling point, steam will be generated. The steam pressure acts on the suction member to move the suction member upward, thereby forming a negative pressure inside the suction box. The second coolant is sucked into the cooling loop to cool the outer wall of the cooling box.

[0010] According to the technical solution provided in the embodiment of the present application, the self-suction assembly further includes a guide box, which is arranged on the top of the cooling box and corresponds to the position of the suction box, and a steam suction chamber is formed in the guide box; the steam suction chamber is connected to the immersion chamber;

[0011] A coolant suction chamber is formed in the suction box, an air guide chamber is provided in the side wall of the suction box, the top of the air guide chamber is communicated with the top of the coolant suction chamber, the bottom of the air guide chamber is communicated with the bottom of the coolant suction chamber; the guide channel is communicated with the upper part of the coolant suction chamber;

[0012] One end of the suction piece is placed in the steam suction chamber, and the other end is placed in the cooling liquid suction chamber.

[0013] According to the technical solution provided in the embodiment of the present application, the suction piece includes:

[0014] A rod body, wherein a first suction plate is provided at one end of the rod body, and a second suction plate is provided at the other end of the rod body; the first suction plate is located in the steam suction chamber, and the second suction plate is located in the coolant suction chamber;

[0015] The suction member has two working states;

[0016] In a first working state, the first suction plate is located at one end of the steam suction chamber close to the cooling box, and the second suction plate is located under the guide channel;

[0017] In the second working state, the first suction plate is located at an end of the steam suction chamber away from the cooling box, and the second suction plate is located on the guide channel.

[0018] According to the technical solution provided in the embodiment of the present application, a balancing air hole is opened on the top of the suction box, and the coolant suction chamber is connected with the air guide chamber through the balancing air hole.

[0019] According to the technical solution provided in the embodiment of the present application, the liquid level of the first coolant in the immersion chamber is greater than the height of the fuel cell.

[0020] The technical solution provided in the embodiment of the present application also includes:

[0021] A one-way valve is installed at the diversion channel, and the one-way valve is used to control the opening and closing of the diversion channel.

[0022] According to the technical solution provided in the embodiment of the present application, a liquid inlet hole and a plurality of liquid outlet holes are provided on the cooling ring pipe, the liquid inlet hole is connected to the guide channel, and the liquid outlet direction of the liquid outlet hole is toward the outer wall of the cooling box.

[0023] The technical solution provided in the embodiment of the present application also includes:

[0024] A recovery tank, the recovery tank is arranged outside the cooling box and close to the bottom of the cooling box;

[0025] The side wall of the cooling box is provided with a reflux port, which is connected to the cooling liquid suction chamber and the recovery tank;

[0026] When the suction member is in the first working state, the liquid level of the second coolant in the coolant suction chamber is flush with the liquid level of the second coolant in the recovery tank;

[0027] When the suction member is in the second working state, the second coolant in the coolant suction chamber flows to the outer wall of the cooling box via the guide channel, the cooling ring pipe and the liquid outlet hole, and flows into the recovery tank.

[0028] According to the technical solution provided in the embodiment of the present application, the depth of the recovery groove is greater than the first height, and the first height is the liquid level of the second coolant in the coolant suction chamber when the suction member is in the first working state.

[0029] In a second aspect, the present application provides a thermal management system, including: the above-mentioned immersed fuel cell cooling device.

[0030] It can be seen from the above technical solution that the present application has at least the following beneficial effects:

[0031] The present application discloses an immersion fuel cell cooling device, which comprises: a cooling box, which is hollow inside to form an immersion cavity for placing and carrying the fuel cell; a self-suction component is also provided inside the immersion cavity, which comprises a suction box and a suction piece, the suction box is arranged in the immersion cavity, and a second coolant is provided therein, and the boiling point of the second coolant is greater than that of the first coolant; the suction piece movably penetrates the top of the suction box and the top of the cooling box, one end of which is located in the suction box, and the other end is located outside the cooling box; a cooling loop is arranged on the outer wall of the cooling box, and the cooling loop is connected to the inside of the suction box through a guide channel; the heat generated by the operation of the fuel cell will be absorbed by the first coolant, and when the temperature of the first coolant reaches the boiling point, steam will be generated, and the steam pressure acts on the suction piece to move the suction piece upward, thereby forming a negative pressure inside the suction box, and the second coolant is sucked into the cooling loop to cool the outer wall of the cooling box.

[0032] The present application designs a self-suction component in the immersion chamber. Since the immersion chamber is a relatively closed space, the fuel cell generates heat when it is placed in the immersion chamber and operates, so that the first coolant in the immersion chamber undergoes phase change cooling, generating steam pressure. This steam pressure is used as a suction power to push the suction member to move relative to the suction box, thereby sucking the second coolant at the bottom of the suction box to flow to the outer wall of the cooling box through the guide channel and the cooling ring pipe, thereby uniformly dissipating the heat of the cooling box and the fuel cell therein. In addition, the present solution does not require the addition of a power structure, thus saving additional energy consumption, and has a large suction volume and a significant heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Other features, objects and advantages of the present application will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings.

[0034] Figure 1 This is a schematic diagram of the overall structure of the immersed fuel cell cooling device.

[0035] Figure 2 This is a front cross-sectional view of an immersed fuel cell cooling device.

[0036] Figure 3 A side cross-sectional view of an immersed fuel cell cooling device.

[0037] Figure 4 It is a schematic diagram of the structure of the cooling ring pipe and the liquid outlet.

[0038] Figure 5 It is a schematic diagram of the structure of the suction piece.

[0039] Figure 6 This is a schematic diagram of a suction member of an immersed fuel cell cooling device in a first working state.

[0040] Figure 7This is a schematic diagram of the suction member of the immersed fuel cell cooling device in the second working state.

[0041] Numbers in the figure: 101, cooling box; 102, steam suction chamber; 103, reflux port; 104, recovery tank; 105, cooling ring; 201, suction member; 202, balance air hole; 203, cooling liquid suction chamber; 204, guide channel; 205, suction box; 206, fuel cell; 207, immersion chamber; 301, liquid outlet; 2011, rod body; 2012, first suction plate; 2013, second suction plate. DETAILED DESCRIPTION

[0042] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0043] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0044] In order to make the description of the following embodiments clear and concise, a brief introduction to the related technology is first given:

[0045] The proton exchange membrane fuel cell (PEMFC) in new energy vehicles is a highly efficient energy conversion device. The working principle of PEMFC is to separate hydrogen from oxygen through a proton exchange membrane, and the oxidation reaction of hydrogen and the reduction reaction of oxygen occur on both sides of the membrane to generate electricity. The key advantages of this battery include high energy conversion efficiency, zero emissions, and fast start-up speed. However, fuel cells generate heat during operation, and an effective cooling system is required to control the temperature to ensure the performance and life of the battery.

[0046] Studies have shown that immersion cooling can dissipate more heat than air cooling and water cooling, and can achieve higher thermal control accuracy. Among them, immersion cooling often requires phase change to achieve better temperature uniformity, but the boiling of coolant in the immersion box often produces a large pressure, so it is necessary to add additional cooling devices, such as cooling fans and fins, water pumps and cooling water drains, which will greatly increase the volume of the cooling system. At the same time, existing heat dissipation methods often require the input of additional electrical energy to power the cooling system, which will significantly increase energy consumption. Therefore, the present application designs the following solution to solve the defects of the prior art.

[0047] In order to make the submerged fuel cell cooling device provided in the embodiment of the present application clearer and easier to understand, the device is introduced below in conjunction with the accompanying drawings. Figure 1 As shown, this figure is a schematic diagram of the overall structure of the submerged fuel cell cooling device provided in an embodiment of the present application, and the device includes:

[0048] Cooling box 101, the interior of cooling box 101 is hollow to form an immersion cavity 207; a fuel cell 206 is placed in the immersion cavity 207; a first coolant is provided in the immersion cavity 207, and the fuel cell 206 is immersed in the first coolant. Among them, cooling box 101 is the main bearing structure of the device, and its interior is hollow to form an immersion cavity 207, which is used to place and accommodate the fuel cell 206. This fuel cell 206 is generally placed inside a large commercial vehicle or a base station of a distributed energy station. In actual application scenarios, this type of fuel cell 206 also has a protective shell or a special building outside to play a role in fixing and protecting.

[0049] The self-suction component includes a suction box 205 and a suction piece 201. The suction box 205 is arranged in the immersion cavity 207, and a second coolant is arranged therein, and the boiling point of the second coolant is greater than the boiling point of the first coolant. The suction piece 201 movably passes through the top of the suction box 205 and the top of the cooling box 101, and one end of the suction box 205 is located inside the suction box 205, and the other end is located outside the cooling box 101. The self-suction component is designed inside the immersion cavity 207, and the suction piece 201 can move relative to the suction box 205, thereby changing the on-off of the guide channel 204 and the suction box 205, and the second coolant between the bottom of the suction box 205 and the suction piece 201 flows through the guide channel 204 to the outer wall of the cooling box 101 to achieve the purpose of cooling. Here, the boiling point of the first coolant needs to be lower than the operating temperature of the fuel cell 206. And, if Figure 6 As shown, when the suction member 201 is in a non-suction state, the straight-line distance between the suction member 201 and the bottom of the suction box 205 is a first distance. Figure 7 As shown, when the suction piece 201 is in the suction state, the straight-line distance between the suction piece 201 and the bottom of the suction box 205 is the second distance, the first distance is smaller than the second distance and the second distance is larger than the straight-line distance between the central axis of the guide channel 204 and the bottom of the suction box 205.

[0050] Specifically, when the heat generated by the fuel cell 206 causes the first coolant in the immersion chamber 207 to boil, steam pressure is generated inside the immersion chamber 207, and the suction piece 201 is subjected to the steam pressure and moves upward, thereby sucking the second coolant between the suction piece 201 and the bottom of the suction box 205, and the second coolant flows into the cooling loop 105 through the guide channel 204, thereby cooling the outer wall of the cooling box 101; when the temperature of the cooling box 101 drops, the suction piece 201 loses the steam pressure and moves downward due to its own gravity.

[0051] The present application designs a self-suction component in the immersion chamber 207. Since the immersion chamber 207 is a relatively closed space, the fuel cell 206 generates heat when it is placed in the immersion chamber 207 and operates, so that the first coolant in the immersion chamber 207 undergoes phase change cooling, generating steam pressure. This steam pressure is used as a suction power to push the suction member 201 to move upward relative to the suction box 205, thereby sucking the second coolant at the bottom of the suction box 205 and flowing it to the outer wall of the cooling box 101 through the guide channel 204 and the cooling loop 105, thereby uniformly dissipating the heat of the cooling box 101 and the fuel cell 206 therein. In addition, the present application does not need to add a power structure, thus saving extra energy consumption, and has a large suction volume and a significant heat dissipation effect.

[0052] It should be noted that if Figure 2 and Figure 6 As shown, the self-priming component also includes:

[0053] The guide box is arranged at the top outside the cooling box 101 and corresponds to the position of the suction box 205, and a steam suction chamber 102 is formed in the guide box; the steam suction chamber 102 is connected with the immersion chamber 207; wherein, the steam suction chamber 102 can be formed by the cooling box 101 protruding outward, or a shell structure is added to the cooling box 101, and the shell structure is connected with the inside of the cooling box 101, and the shell structure is hollow inside to form the steam suction chamber 102; and, no matter which method is used to form the steam suction chamber 102, it has an opening connected to the external environment, which is convenient for the normal movement of the suction piece 201 and prevents the air between the top of the suction piece 201 and the top of the steam suction chamber 102 from forming resistance during the suction process.

[0054] A coolant suction chamber 203 is formed inside the suction box 205, and an air guide chamber is provided in the side wall of the suction box 205. The top of the air guide chamber is communicated with the top of the coolant suction chamber 203, and the bottom of the air guide chamber is communicated with the bottom of the coolant suction chamber 203. The lower end of the coolant suction chamber 203 and the bottom of the air guide chamber form a receiving space for receiving the second coolant. The coolant suction chamber 203 is communicated with the guide channel 204.

[0055] One end of the suction member 201 is placed in the steam suction chamber 102 , and the other end thereof is placed in the coolant suction chamber 203 .

[0056] Specifically, Figure 5 As shown, the suction member 201 includes:

[0057] The rod body 2011 has a first suction plate 2012 at one end and a second suction plate 2013 at the other end; the first suction plate 2012 is located in the steam suction chamber 102, and the second suction plate 2013 is located in the cooling liquid suction chamber 203; wherein, the first suction plate 2012 contacts the inner wall surface of the steam suction chamber 102, and the second suction plate 2013 contacts the inner wall surface of the cooling liquid suction chamber 203, so that the steam pressure generated when the fuel cell 206 is running can completely act on the suction member 201, and the suction member 201 can move stably, so as to achieve the purpose of autonomous suction and cooling.

[0058] The suction member 201 has two working states; Figure 6 As shown, in the first working state, the first suction plate 2012 is located at one end of the steam suction chamber 102 close to the cooling box 101, and the second suction plate 2013 is located under the guide channel 204; Figure 7 As shown, in the second working state, the first suction plate 2012 is located at one end of the steam suction chamber 102 away from the cooling box 101, and the second suction plate 2013 is located on the guide channel 204. The first working state refers to the suction member 201 being in a non-suction state, and the second working state refers to the suction member 201 being in a suction state.

[0059] Furthermore, if Figure 2 As shown, a balancing air hole 202 is opened on the top of the suction box 205, and the coolant suction chamber 203 is connected with the air guide chamber through the balancing air hole 202, so as to avoid resistance being formed between the second suction plate 2013 and the top of the coolant suction chamber 203 during the suction process, thereby affecting the normal movement of the suction member 201.

[0060] The liquid level of the first coolant in the immersion cavity 207 is greater than the height of the fuel cell 206 , ensuring that the electrodes and membranes of the fuel cell 206 are completely immersed in the first coolant in the immersion cavity 207 to ensure a cooling effect.

[0061] Furthermore, it also includes:

[0062] One-way valve, the one-way valve is installed at the guide channel 204, and the one-way valve is used to control the on-off of the guide channel 204; here, the one-way valve has a rated pressure, and the one-way valve can be opened when subjected to an external force greater than its rated pressure.

[0063] Furthermore, if Figure 1 , Figure 2 and Figure 3 As shown, it also includes:

[0064] like Figure 4As shown, the cooling ring pipe 105 is provided with a liquid inlet hole and a plurality of liquid outlet holes 301 , the liquid inlet hole is connected to the guide channel 204 , and the liquid outlet hole 301 is directed toward the outer wall of the cooling box 101 , so as to guide the second coolant in the cooling ring pipe 105 to the outer wall of the cooling box 101 .

[0065] The recovery tank 104 is arranged outside the cooling box 101 and near the bottom of the cooling box 101; wherein the depth of the recovery tank 104 is greater than the height of the second coolant level in the initial state, so as to reduce the probability of the second coolant in the recovery tank 104 spilling out in the actual application scenario. In addition, since the device and the fuel cell 206 have other protective structures in the actual application scenario, external pollutants will not enter the recovery tank 104 and will not cause blockage problems.

[0066] The reflux port 103 is provided on the side wall of the cooling box 101 and is connected to the cooling liquid suction chamber 203 and the recovery tank 104; wherein the reflux port 103 serves as a connection port between the cooling liquid suction chamber 203 and the recovery tank 104 to realize the circulation of the second cooling liquid.

[0067] When the suction member 201 is in the first working state, the liquid level of the second coolant in the coolant suction chamber 203 is flush with the liquid level of the second coolant in the recovery tank 104; when the suction member 201 is in the second working state, the second coolant in the coolant suction chamber 203 flows to the outer wall of the cooling box 101 through the guide channel 204, the cooling ring 105 and the liquid outlet hole 301, and flows into the recovery tank 104.

[0068] Among them, the depth of the recovery groove 104 is greater than the first height, and the first height is the liquid level of the second coolant in the coolant suction chamber 203 when the suction member 201 is in the first working state; that is, when the suction member 201 is in a non-suction state, the liquid level of the second coolant in the recovery groove 104 is higher than the reflux port 103, and the liquid level of the second coolant in the coolant suction chamber 203 is flush with the liquid level of the second coolant in the recovery groove 104, forming a liquid seal. When the fuel cell 206 is running and generates heat, the suction box 205 is separated from the outside world, allowing the steam pressure to act on the suction member 201 and drive the suction member 201 to move, so that the suction member 201 can stably suck the second coolant.

[0069] The specific working process of this device is as follows:

[0070] After the fuel cell 206 starts to operate, when the heat generated by the fuel cell 206 is small, the pressure inside the immersion chamber 207 is close to the external pressure. At this time, the suction member 201 remains in a non-suction state under the action of its own gravity and the pressure inside the coolant suction chamber 203; Figure 6 As shown, at this time, ;

[0071] in, is the initial pressure in the immersion chamber 207, is the environmental pressure, is the cross-sectional area of ​​the first suction plate 2012 or the second suction plate 2013 of the suction member 201, is the acceleration due to gravity, is the mass of the suction member 201 itself, is the density of the second coolant, is the initial liquid level of the second coolant in the coolant suction chamber 203 .

[0072] For example, the initial pressure and ambient pressure P e The pressure is 100 kPa, and the cross-sectional area of ​​the first suction plate 2012 or the second suction plate 2013 of the suction member 201 is 0.1 m 2 , the mass of the suction member 201 itself is 0.1 kg. Based on the above formula, it can be calculated that the initial liquid level of the second coolant in the coolant suction chamber 203 is 0 m, which is the reference liquid level.

[0073] Since the fuel cell 206 itself continuously generates heat, its temperature continuously rises and gradually exceeds the boiling point of the first coolant in the immersion chamber 207, causing the first coolant to undergo a phase change. At this time, due to the phase change characteristics of the liquid, the fuel cell 206 can obtain the best heat dissipation effect. At the same time, the pressure in the immersion chamber 207 will continue to rise, that is, steam pressure will be generated, forming a pressure difference with the outside world. In addition, the upper part of the suction member 201 (the first suction plate 2012 and part of the rod body 2011) is placed in the steam suction chamber 102, dividing the steam suction chamber 102 into two parts, the upper part is connected to the outside world, and the lower part of the suction member 201 is placed in the coolant suction chamber 203. When the highest liquid level of the second coolant in the suction box 205 is higher than the lower edge of the coolant suction chamber 203 at the lowest position of the suction box 205, a liquid seal will be formed. At this time, the steam pressure acts on the suction member 201, which will push the suction member 201 to move upward, and the suction member 201 will move upward. When the suction member 201 rises, the liquid level of the second coolant in the coolant suction chamber 203 will rise under the action of the internal and external pressure difference, and gradually become higher than the guide channel 204. When the suction member 201 rises, due to the existence of the balancing air hole 202, the lower half of the suction member 201 (the second suction plate 2013 and part of the rod body 2011) allows the air in the coolant suction chamber 203 to enter the guide chamber through the balancing air hole 202, thereby preventing the air in the lower half of the suction member 201 (the second suction plate 2013 and part of the rod body 2011) from being compressed and hindering the movement of the suction member 201.

[0074] like Figure 7As shown, at this time, ;

[0075] in, is the pressure of the first coolant in the immersion chamber 207 after boiling due to phase change, , is the liquid level of the second coolant in the coolant suction chamber 203 .

[0076] Assume that the pressure of the first cooling liquid in the immersion chamber 207 after boiling due to phase change is 110 kPa, and the cross-sectional area of ​​the first suction plate 2012 or the second suction plate 2013 of the suction member 201 is 0.1 m 2 , the mass of the suction piece 201 itself is 0.1 kg, and it can be calculated that =1m.

[0077] When the height difference pressure generated by the rising liquid level of the second coolant is greater than the rated pressure of the one-way valve, the height difference pressure can open the one-way valve, so that the guide channel 204 is in a conductive state, and the greater the height difference, the greater the height difference pressure generated, and the greater the flow rate of the second coolant, thereby achieving control of the flow rate of the second coolant. The setting is based on the height that can be met when actually applied to the vehicle, and there is no restriction here.

[0078] Furthermore, the sucked up second coolant enters the cooling loop 105, and flows to the outer wall of the cooling box 101 through each liquid outlet 301, so as to cool the outer wall of the cooling box 101 and the first coolant in the immersion cavity 207. As the temperature of the cooling box 101 and the first coolant decreases, the first coolant in the immersion cavity 207 condenses, causing the pressure in the immersion cavity 207 to decrease. At this time, the pressure is Down to , the suction member 201 descends to The second coolant flowing through the outer wall of the cooling box 101 is cooled by natural evaporation and convection. A small amount of the second coolant evaporates, and most of the second coolant flows back to the recovery tank 104 and enters the coolant suction chamber 203 through the reflux port 103. This cycle is repeated to achieve the purpose of self-suction cooling without additional driving force.

[0079] The present application also provides a thermal management system, including: the above-mentioned submerged fuel cell cooling device. This thermal management system has the functions and advantages of the submerged fuel cell cooling device, which will not be described in detail here.

[0080] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. An immersion fuel cell cooling device, characterized in that: include: A cooling box (101), the interior of the cooling box (101) being hollow to form an immersion cavity (207), a first cooling liquid being provided in the immersion cavity (207), and the fuel cell (206) being immersed in the first cooling liquid; A self-suction component, the self-suction component comprising a suction box (205) and a suction piece (201), the suction box (205) being arranged in the immersion cavity (207), and containing a second coolant, the boiling point of the second coolant being greater than the boiling point of the first coolant; the suction piece (201) movably passing through the top of the suction box (205) and the top of the cooling box (101), one end of the suction piece (201) being located in the suction box (205), and the other end being located outside the cooling box (101); A cooling ring pipe (105), the cooling ring pipe (105) being arranged on the outer wall of the cooling box (101), the cooling ring pipe (105) being connected to the interior of the suction box (205) via a guide channel (204); The cooling ring pipe (105) is provided with a liquid inlet hole and a plurality of liquid outlet holes (301), the liquid inlet hole is in communication with the flow guide channel (204), and the liquid outlet direction of the liquid outlet hole (301) is toward the outer wall of the cooling box (101); Also includes: A recovery trough (104), the recovery trough (104) being arranged outside the cooling box (101) and close to the bottom of the cooling box (101); A reflux port (103) is provided on the side wall of the cooling box (101), and the reflux port (103) is in communication with a cooling liquid suction chamber (203) formed in the suction box (205) and the recovery tank (104); When the suction member (201) is in the first working state, the liquid level of the second coolant in the coolant suction chamber (203) is flush with the liquid level of the second coolant in the recovery tank (104); When the suction member (201) is in the second working state, the second coolant in the coolant suction chamber (203) flows to the outer wall of the cooling box (101) via the guide channel (204), the cooling ring pipe (105) and the liquid outlet hole (301), and flows into the recovery tank (104); The heat generated by the operation of the fuel cell (206) will be absorbed by the first coolant. When the temperature of the first coolant reaches the boiling point, steam will be generated. The steam pressure acts on the suction member (201) to move the suction member (201) upward, thereby forming a negative pressure inside the suction box (205). The second coolant is sucked into the cooling loop (105) to cool the outer wall of the cooling box (101).

2. The submerged fuel cell cooling device according to claim 1, characterized in that: The self-suction assembly further comprises a guide box, the guide box being arranged at the top of the cooling box (101) and corresponding to the position of the suction box (205), a steam suction chamber (102) being formed in the guide box; the steam suction chamber (102) being in communication with the immersion chamber (207); A cooling liquid suction chamber (203) is formed in the suction box (205), an air guide chamber is provided in the side wall of the suction box (205), the top of the air guide chamber is communicated with the top of the cooling liquid suction chamber (203), and the bottom of the air guide chamber is communicated with the bottom of the cooling liquid suction chamber (203); the flow guide channel (204) is communicated with the upper part of the cooling liquid suction chamber (203); One end of the suction piece (201) is placed in the steam suction chamber (102), and the other end is placed in the cooling liquid suction chamber (203).

3. The submerged fuel cell cooling device according to claim 2, characterized in that: The suction piece (201) comprises: A rod body (2011), wherein a first suction plate (2012) is provided at one end of the rod body (2011), and a second suction plate (2013) is provided at the other end of the rod body (2011); the first suction plate (2012) is located in the steam suction chamber (102), and the second suction plate (2013) is located in the cooling liquid suction chamber (203); The suction member (201) has two working states; In a first working state, the first suction plate (2012) is located at one end of the steam suction chamber (102) close to the cooling box (101), and the second suction plate (2013) is located below the guide channel (204); In the second working state, the first suction plate (2012) is located at an end of the steam suction chamber (102) away from the cooling box (101), and the second suction plate (2013) is located above the guide channel (204).

4. The submerged fuel cell cooling device according to claim 3, characterized in that: A balancing air hole (202) is provided on the top of the suction box (205), and the coolant suction cavity (203) is connected to the air guide cavity through the balancing air hole (202).

5. The submerged fuel cell cooling device according to claim 2, characterized in that: The liquid level of the first cooling liquid in the immersion cavity (207) is greater than the height of the fuel cell (206).

6. The submerged fuel cell cooling device according to claim 4, characterized in that: Also includes: A one-way valve, the one-way valve being installed at the flow guiding channel (204), the one-way valve being used to control the on-off state of the flow guiding channel (204).

7. The submerged fuel cell cooling device according to claim 1, characterized in that: The depth of the recovery groove (104) is greater than the first height, wherein the first height is the liquid level of the second coolant in the coolant suction chamber (203) when the suction member (201) is in the first working state.

8. A thermal management system, characterized in that: include: An immersed fuel cell cooling device as described in any one of claims 1 to 7.

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