Fuel cell single cell anti-overflowing glue structure, single cell structure and cell stack

Abstract

The present application relates to a kind of fuel cell single cell anti-overflowing glue structure, single cell structure and cell stack, the single cell anti-overflowing glue structure includes: the anode plate, membrane electrode and cathode plate are stacked in sequence, the side of membrane electrode towards anode plate is equipped with first boss, and first anti-overflowing glue structure is arranged on first boss, the side of membrane electrode towards cathode plate is equipped with second boss, and second anti-overflowing glue structure is arranged on second boss. By setting first boss between anode plate and membrane electrode, second boss between cathode plate and membrane electrode, it can avoid forming seal between first boss and anode reaction cavity, between second boss and cathode reaction cavity in the process of glue injection, by using the first anti-overflowing glue structure proposed in the application at first boss, and the second anti-overflowing glue structure arranged at second boss, can effectively avoid the beneficial effect of sealing glue flowing into first channel or second channel to cause the problem of blockage.

Description

Technical Field

[0001] This invention relates to the field of fuel cell technology, specifically to a fuel cell single-cell anti-overflow adhesive structure, a single-cell structure, and a fuel cell stack. Background Technology

[0002] A fuel cell is a chemical device that converts the chemical energy of fuel into electrical energy. It is the fourth type of power generation technology after hydropower, thermal power, and nuclear power. Because fuel cells convert the chemical energy of fuel into electrical energy through an electrochemical reaction, they are not constrained by the Carnot cycle effect and are therefore extremely efficient.

[0003] Currently, existing single-cell batteries are formed by integrated encapsulation of multi-layer sealing elements. During the encapsulation process, the frames of the anode plate, membrane electrode assembly (MEA), and cathode plate cooperate to form an encapsulation sealing channel. The sealant forms a sealing structure within the encapsulation sealing channel, simultaneously sealing the plates and MEA to form the single cell. Because the plates are formed using a precision stamping process, the encapsulation sealing channel and the mounting grooves of the plate frame have certain rounded corners. The MEA frame and its corresponding bosses are die-cut, with right angles around the bosses. Therefore, there will be a certain gap between the cross-section of the bosses and the plate grooves. During the encapsulation process, liquid sealant may flow into the encapsulation sealing channel between the stamped plate and the die-cut MEA bosses. There is a connecting channel between the MEA frame bosses and the MEA reaction zone. This could cause liquid sealant to reach the connecting channel through the gap between the plate and the MEA frame, thus blocking the connecting channel.

[0004] Therefore, to address the aforementioned technical problems, it is necessary to propose a fuel cell single-cell anti-overflow adhesive structure to solve the problem of adhesive overflow blocking the communication channel between the membrane electrode frame protrusion and the membrane electrode reaction zone due to the gap between the mating edge of the electrode plate mounting groove and the membrane electrode protrusion. Summary of the Invention

[0005] One objective of this invention is to provide a fuel cell single-cell anti-overflow adhesive structure to solve the problem of adhesive overflow blocking the communication channel between the membrane electrode frame protrusion and the membrane electrode reaction zone due to the gap between the mating edge of the electrode plate mounting groove and the membrane electrode protrusion; another objective is to provide a fuel cell single-cell structure; and a third objective is to provide a fuel cell stack.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A fuel cell single-cell anti-overflow adhesive structure, comprising:

[0008] An anode plate, a membrane electrode assembly (MEA), and a cathode plate are stacked sequentially. A first sealing groove is provided between the anode plate and the MEA, and an anode reaction chamber is formed within the area enclosed by the first sealing groove. A second sealing groove is provided between the cathode plate and the MEA, and a cathode reaction chamber is formed within the area enclosed by the second sealing groove. The anode plate, the MEA, and the cathode plate are respectively provided with a first gas channel, a second gas channel, and a cooling water channel. A first protrusion surrounding the first gas channel is provided on the side of the MEA facing the anode plate. A first duct is provided on the side of the first protrusion near the anode reaction chamber, and the first duct connects the anode reaction chamber and the first gas channel. The first sealing groove is located around the first protrusion. The first protrusion is positioned away from the side facing the anode reaction chamber. A first anti-overflow structure is provided on the inner side of the first sealing groove between the anode plate and the membrane electrode to prevent sealant from flowing into the first duct from the first sealing groove. A second protrusion is provided on the side of the membrane electrode facing the cathode plate, surrounding the second gas channel. A second duct is provided on the side of the second protrusion near the cathode reaction chamber, and the second duct is used to connect the cathode reaction chamber and the second gas channel. The second sealing groove is located around the second protrusion and avoids the side of the second protrusion facing the cathode reaction chamber. A second anti-overflow structure is provided on the inner side of the second sealing groove between the cathode plate and the membrane electrode to prevent sealant from flowing into the second duct from the second sealing groove.

[0009] According to the above-mentioned technical means, by setting a first protrusion between the anode plate and the membrane electrode and setting a second protrusion between the cathode plate and the membrane electrode, the sealant can be avoided between the first protrusion and the anode reaction chamber and between the second protrusion and the cathode reaction chamber during the glue injection process. By adopting the first anti-overflow glue structure set at the first protrusion and the second anti-overflow glue structure set at the second protrusion proposed in this application, the beneficial effect of avoiding the sealant flowing into the first duct or the second duct and causing blockage can be effectively avoided.

[0010] Optionally, the first anti-overflow adhesive structure includes a first anode anti-overflow adhesive portion extending along the width direction of the membrane electrode from the side of the first protrusion near the anode reaction chamber, and / or a second anode anti-overflow adhesive portion extending along the length direction of the membrane electrode from the side of the first protrusion near the anode reaction chamber; the second anti-overflow adhesive structure includes a first cathode anti-overflow adhesive portion extending along the width direction of the membrane electrode from the side of the second protrusion near the cathode reaction chamber, and / or a second cathode anti-overflow adhesive portion extending along the length direction of the membrane electrode from the side of the first protrusion near the anode reaction chamber.

[0011] Based on the above technical means, the design of the first anti-overflow adhesive part of the anode, the second anti-overflow adhesive part of the anode, the first anti-overflow adhesive part of the cathode, and the second anti-overflow adhesive part of the cathode can effectively extend the overflow path of the sealant, thereby ensuring that the sealant cannot reach the first duct or the second duct within the preset time after the adhesive is injected, thus avoiding the beneficial effect of clogging the first duct or the second duct.

[0012] Optionally, the first anti-overflow adhesive portion of the anode, the second anti-overflow adhesive portion of the anode, the first anti-overflow adhesive portion of the cathode, and the second anti-overflow adhesive portion of the cathode are all provided with a labyrinth structure.

[0013] Based on the above technical means, the first anti-overflow adhesive section of the anode, the second anti-overflow adhesive section of the anode, the first anti-overflow adhesive section of the cathode, and the second anti-overflow adhesive section of the cathode all adopt a labyrinth structure, which effectively extends the overflow path of the sealant, ensuring that the sealant cannot reach the first duct and the second duct, while not affecting the reaction area of ​​the reaction zone.

[0014] Optionally, the first anti-overflow adhesive portion of the anode, the second anti-overflow adhesive portion of the anode, the first anti-overflow adhesive portion of the cathode, and the second anti-overflow adhesive portion of the cathode all protrude from the membrane electrode along the thickness direction. The anode plate is provided with a first anode labyrinth groove and a second anode labyrinth groove for cooperating with the first anode anti-overflow adhesive portion and the second anode anti-overflow adhesive portion. The cathode plate is provided with a first cathode labyrinth groove and a second cathode labyrinth groove for cooperating with the first cathode anti-overflow adhesive portion and the second cathode anti-overflow adhesive portion.

[0015] Based on the above technical means, the anode plate is provided with a first anode labyrinth groove and a second anode labyrinth groove, and the cathode plate is provided with a first cathode labyrinth groove and a second cathode labyrinth groove. This way, the anti-overflow adhesive structure can meet the anti-overflow adhesive function during the single cell glue injection and sealing process, while not affecting the volumetric power density of the single cell structure.

[0016] Optionally, the first anti-overflow adhesive part of the anode, the second anti-overflow adhesive part of the anode, the first anti-overflow adhesive part of the cathode, and the second anti-overflow adhesive part of the cathode all have similar structures, each including a strip-shaped main body and a plurality of protruding teeth connected to the side of the strip-shaped main body, the plurality of protruding teeth being spaced apart along the length direction of the strip-shaped main body.

[0017] According to the above technical means, by setting protruding teeth on the strip body, the overflow path of the sealant can be effectively extended, while reducing the setting length of the strip body, thereby avoiding affecting the area ratio of the reaction zone of the single cell.

[0018] Optionally, the first boss and its corresponding anode first anti-overflow adhesive portion and anode second anti-overflow adhesive portion are integrally formed; the second boss and its corresponding cathode first anti-overflow adhesive portion and cathode second anti-overflow adhesive portion are integrally formed, and the thickness of the first boss, the anode first anti-overflow adhesive portion, the anode second anti-overflow adhesive portion, the second boss, the cathode first anti-overflow adhesive portion and the cathode second anti-overflow adhesive portion protruding from the membrane electrode is the same.

[0019] Based on the above technical means, by designing the boss and the anti-overflow adhesive structure with the same thickness and integral molding, the processing difficulty can be effectively reduced, thereby improving the processing efficiency. It also avoids the single battery bulging and warping caused by inconsistent design thickness, thus having the beneficial effect of avoiding affecting the service life of the single battery.

[0020] Optionally, the anode plate is provided with an anode mounting groove corresponding to the first boss, and the anode mounting groove is used to cooperate in installing the first boss; the cathode plate is provided with a cathode mounting groove corresponding to the second boss, and the cathode mounting groove is used to cooperate in installing the second boss.

[0021] According to the above technical means, by setting corresponding anode mounting grooves on the anode plate for mounting the first boss and corresponding cathode mounting grooves on the cathode plate for mounting the second boss, the thickness of a single cell can be effectively reduced, thereby increasing the volumetric power density of a fuel cell. Furthermore, the cooperation between the bosses and the mounting grooves can effectively improve the tightness of the fit between the electrode plate and the membrane electrode assembly, reducing the risk of relative displacement between the electrode plate and the membrane electrode assembly, thus reducing the beneficial effect of reducing the sealing failure of the sealing structure.

[0022] Optionally, the first sealing groove is disposed on the anode plate, and the opening of the first sealing groove faces the membrane electrode. The first sealing groove includes a main anode sealing groove, a first anode sealing groove disposed around the second gas channel, and a second anode sealing groove disposed around the cooling water channel. The first anode sealing groove and the second anode sealing groove are both connected to the main anode sealing groove. The second sealing groove is disposed on the cathode plate, and the opening of the second sealing groove faces the membrane electrode. The second sealing groove includes a main cathode sealing groove, a first cathode sealing groove disposed around the first gas channel, and a second cathode sealing groove disposed around the cooling water channel. The first cathode sealing groove and the second cathode sealing groove are both connected to the main cathode sealing groove.

[0023] Based on the above technical means, the structural design of the first sealing groove and the second sealing groove avoids the formation of island seals by the sealant in the medium channel, thereby avoiding the formation of a purge blind zone inside the single cell, avoiding mutual internal leakage between the second gas, cooling water and the first gas in the anode reaction chamber, and avoiding mutual internal leakage between the first gas, cooling water and the second gas in the cathode reaction chamber.

[0024] Optionally, the first sealing groove has a plurality of anode plate reinforcement structures protruding toward the membrane electrode distributed along its extension trajectory, and the second sealing groove has a plurality of cathode plate reinforcement structures protruding toward the membrane electrode distributed along its extension trajectory. The anode plate reinforcement structures and the cathode plate reinforcement structures are arranged opposite to each other and both abut against the membrane electrode.

[0025] Based on the above technical means, the design of the anode plate reinforcement structure and the cathode plate reinforcement structure can effectively improve the structure of the electrode plates and reduce the risk of warping and deformation of the electrode plates during transportation. The anode plate reinforcement structure and the cathode plate reinforcement structure are set opposite to each other and both abut against the membrane electrode, which avoids the membrane electrode deformation and damage caused by excessive injection pressure during the single cell injection sealing process, thus preventing membrane electrode reaction failure. This effectively improves the yield rate of single cell products.

[0026] Optionally, the anode plate has a second gas channel boss surrounding the second gas channel and a cooling water channel boss surrounding the cooling water channel; the cathode plate has a first gas channel boss surrounding the first gas channel and a cooling water channel boss surrounding the cooling water channel.

[0027] According to the above technical means, the bosses of the second gas channel and the cooling water channel of the anode plate can effectively prevent the sealant from overflowing from the first sealing groove into the second gas channel and the cooling water channel of the anode plate; the bosses of the first gas channel and the cooling water channel of the cathode plate can effectively prevent the sealant from overflowing from the second sealing groove into the first gas channel and the cooling water channel of the cathode plate.

[0028] A fuel cell single-cell structure includes a fuel cell single-cell anti-overflow adhesive structure, wherein the anode plate, the membrane electrode, and the cathode plate are sealed and connected by injecting sealant into the first sealing groove and the second sealing groove to form the single-cell structure.

[0029] A fuel cell stack comprises multiple single-cell structures stacked together.

[0030] The beneficial effects of this invention are as follows: By providing a first protrusion between the anode plate and the membrane electrode, the sealant, when injected into the first sealing groove, avoids forming a circumferential seal at the first gas channel, thereby enabling the first channel on the first protrusion to communicate with the anode reaction chamber; by providing a second protrusion between the cathode plate and the membrane electrode, the sealant, when injected into the second sealing groove, avoids forming a circumferential seal at the second gas channel, thereby enabling the second channel on the second protrusion to communicate with the cathode reaction chamber; since the membrane electrode, the first protrusion, and the second protrusion are all die-cut and have right-angled edges, and the anode plate and the cathode plate are punched... In the pressing process, the mating surfaces on the anode plate and the cathode plate, which are stamped to correspond to the first boss and the second boss respectively, are both rounded. There are gaps between the rounded edges on the electrode plates and the right-angled edges on the first and second bosses. The sealant can easily flow from the gaps to the first or second duct, thus easily clogging the first or second duct. Therefore, by adopting the first anti-overflow sealant structure at the first boss and the second anti-overflow sealant structure at the second boss proposed in this application, the beneficial effect of preventing the sealant from flowing into the first or second duct and causing clogging can be effectively avoided. Attached Figure Description

[0031] Figure 1 The diagram shown is a schematic representation of the structure of the anode side of the membrane electrode according to an embodiment of this application.

[0032] Figure 2 The diagram shown is a schematic representation of the structure of the cathode side of the membrane electrode according to an embodiment of this application.

[0033] Figure 3 The diagram shown is a schematic representation of the structure of the anode plate according to an embodiment of this application.

[0034] Figure 4 The diagram shown is a schematic representation of the structure of the cathode plate according to an embodiment of this application.

[0035] Figure 5 The diagram shows a cross-sectional view of the fit between the cathode plate mounting groove and the second boss.

[0036] Part Number Explanation

[0037] Anode plate 1, First sealing groove 101, Anode main sealing groove 101a, Anode first sealing groove 101b, Anode second sealing groove 101c, Anode plate reinforcing structure 101d, Anode plate flow channel area 102, Anode plate first gas channel 103, Anode plate cooling water channel 104, Anode plate second gas channel 105, Anode first labyrinth groove 106, Anode second labyrinth groove 107, Anode mounting groove 108, Anode plate second gas channel boss 109, Anode plate cooling water channel boss 110, Membrane electrode 2, Membrane electrode reaction zone 201, Membrane electrode first gas channel 202, Membrane electrode cooling water channel 203, Membrane electrode second gas channel 204, First boss 205, First duct 205a, First anti-overflow adhesive structure 206, Anode first anti-overflow adhesive Part 206a, Anode second anti-overflow adhesive part 206b, Second boss 207, Second duct 207a, Second anti-overflow adhesive structure 208, Cathode first anti-overflow adhesive part 208a, Cathode second anti-overflow adhesive part 208b, Cathode plate 3, Second sealing groove 301, Cathode main sealing groove 301a, Cathode first sealing groove 301b, Cathode second sealing groove 301c, Cathode plate reinforcing structure 301d, Cathode plate flow channel area 302, Cathode plate first gas channel 303, Cathode plate cooling water channel 304, Cathode plate second gas channel 305, Cathode first labyrinth groove 306, Cathode second labyrinth groove 307, Cathode mounting groove 308, Cathode plate first gas channel boss 309, Cathode plate cooling water channel boss 310, Strip body 4, Protruding tooth 401, Gap 5. Detailed Implementation

[0038] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0039] Please see Figures 1 to 5It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show components relevant to the present invention and are not drawn according to the actual number, shape, and size of components in implementation. In actual implementation, the form, quantity, and proportion of each component can be arbitrarily changed, and the component layout may be more complex. The structures, proportions, and sizes shown in the accompanying drawings are only for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation conditions of the present invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effects and objectives of the present invention, should still fall within the scope of the technical content disclosed in the present invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are only for clarity of description and are not intended to limit the scope of the present invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the present invention.

[0040] Before describing the embodiments of the present invention in detail, the application environment of the present invention will be described first. The technology of the present invention is mainly applied to the field of automotive fuel cell technology. The present invention is used to solve the problem in the prior art where there is a gap between the mating edge of the electrode plate mounting groove and the membrane electrode boss, resulting in glue overflow blocking the communication channel between the membrane electrode frame boss and the membrane electrode reaction area.

[0041] Please combine Figures 1 to 5 As shown, this application proposes a fuel cell single-cell anti-overflow adhesive structure, comprising:

[0042] In an exemplary embodiment of this application, an anode plate 1, a membrane electrode 2, and a cathode plate 3 are stacked sequentially. A first sealing groove 101 is provided between the anode plate 1 and the membrane electrode 2, and an anode reaction chamber is formed within the area enclosed by the first sealing groove 101. A second sealing groove 301 is provided between the cathode plate 3 and the membrane electrode 2, and a cathode reaction chamber is formed within the area enclosed by the second sealing groove 301. The anode plate 1, the membrane electrode 2, and the cathode plate 3 are respectively provided with a first gas channel, a second gas channel, and a cooling water channel. A first protrusion 205 is provided on the side of the membrane electrode 2 facing the anode plate 1, surrounding the first gas channel. A first duct 205a is provided on the side of the first protrusion 205 near the anode reaction chamber, and the first duct 205a is used to connect the anode reaction chamber and the first gas channel. The first sealing groove 101 is located around the first protrusion 205, and... The first protrusion 205 is positioned away from the side facing the anode reaction chamber. A first anti-overflow structure 206 is provided inside the first sealing groove 101 between the anode plate 1 and the membrane electrode 2 to prevent sealant from flowing into the first duct 205a from the first sealing groove 101. A second protrusion 207 is provided on the side of the membrane electrode 2 facing the cathode plate 3, surrounding the second gas channel. A second duct 207a is provided on the side of the second protrusion 207 near the cathode reaction chamber, and the second duct 207a is used to connect the cathode reaction chamber and the second gas channel. The second sealing groove 301 is located around the second protrusion 207 and avoids the side of the second protrusion 207 facing the cathode reaction chamber. A second anti-overflow structure 208 is provided inside the second sealing groove 301 between the cathode plate 3 and the membrane electrode 2 to prevent sealant from flowing into the second duct 207a from the second sealing groove 301.

[0043] In this embodiment, the membrane electrode 2 has a membrane electrode reaction region 201 in the middle, the anode plate 1 has an anode plate flow channel region 102 corresponding to the membrane electrode reaction region 201, and the cathode plate 3 has a cathode plate flow channel region 302 corresponding to the membrane electrode reaction region 201. The anode plate flow channel region 102 and the membrane electrode reaction region 201 cooperate to form an anode reaction chamber, and the cathode plate flow channel region 302 and the membrane electrode reaction region 201 cooperate to form a cathode reaction chamber. The first gas channel includes an anode plate first gas channel 103 disposed on the anode plate 1, a membrane electrode first gas channel 202 disposed on the membrane electrode 2, and a cathode plate first gas channel 303 disposed on the cathode plate 3. The second gas channel includes an anode plate second gas channel 105 disposed on the anode plate 1. The membrane electrode second gas channel 204 is placed on the membrane electrode 2, and the cathode plate second gas channel 305 is placed on the cathode plate 3. The cooling water channels include the anode plate cooling water channel 104 placed on the anode plate 1, the membrane electrode cooling water channel 203 placed on the membrane electrode 2, and the cathode plate cooling water channel 304 placed on the cathode plate 3. By providing a first protrusion 205 between the anode plate 1 and the membrane electrode 2, the sealant, when injected into the first sealing groove 101, avoids forming a circumferential seal at the first gas channel, thereby allowing the first duct 205a on the first protrusion 205 to communicate with the anode reaction chamber. By providing a second protrusion 207 between the cathode plate 3 and the membrane electrode 2, the sealant, when injected into the second sealing groove 3, avoids forming a circumferential seal at the first gas channel. Within 01, a circumferential seal is avoided at the second gas channel, allowing the second duct 207a on the second protrusion 207 to communicate with the cathode reaction chamber. Since the membrane electrode 2, the first protrusion 205, and the second protrusion 207 are all die-cut and have right-angled edges, and the anode plate 1 and the cathode plate 3 are stamped, the mating surfaces on the anode plate 1 corresponding to the first protrusion 205 and the cathode plate 3 corresponding to the second protrusion 207, formed by stamping, both have rounded corners. There are gaps between the rounded corners on the electrode plates and the right-angled edges on the first protrusion 205 and the second protrusion 207. Sealant can easily flow from these gaps to the first duct 205a / second duct 207a, potentially clogging the first duct 205a or... Therefore, by adopting the first anti-overflow structure 206 provided in this application, located inside the first sealing groove 101 between the anode plate 1 and the membrane electrode 2 (i.e., outside the first sealing groove 101 near the membrane electrode reaction zone 201), to prevent sealant from flowing into the first duct 205a from the first sealing groove 101, and the second anti-overflow structure 208 provided in this application, located inside the second sealing groove 301 between the cathode plate 3 and the membrane electrode 2 (i.e., outside the second sealing groove 301 near the membrane electrode reaction zone 201), to prevent sealant from flowing into the second duct 207a from the second sealing groove 301, the beneficial effect of preventing sealant from flowing into the first duct 205a or the second duct 207a and causing blockage problems can be effectively avoided.

[0044] In an exemplary embodiment of this application, the first anti-overflow adhesive structure 206 includes an anode first anti-overflow adhesive portion 206a extending along the width direction of the membrane electrode 2 from the side of the first boss 205 near the anode reaction chamber, and / or an anode second anti-overflow adhesive portion 206b extending along the length direction of the membrane electrode 2 from the side of the first boss 205 near the anode reaction chamber; the second anti-overflow adhesive structure 208 includes a cathode first anti-overflow adhesive portion 208a extending along the width direction of the membrane electrode 2 from the side of the second boss 207 near the cathode reaction chamber, and / or a cathode second anti-overflow adhesive portion 208b extending along the length direction of the membrane electrode 2 from the side of the first boss 205 near the anode reaction chamber.

[0045] In this embodiment, by providing a first anti-overflow adhesive portion 206a extending along the width direction of the membrane electrode 2 and / or a second anti-overflow adhesive portion 206b extending along the length direction of the membrane electrode 2 on the side of the first boss 205 near the anode reaction chamber and located on the outer side of the first sealing groove 101 near the anode reaction chamber, the overflow path of the sealant through the gap between the first boss 205 and the mating surface of the anode plate 1 in the first sealing groove 101 is effectively extended. This ensures that the sealant cannot reach the first duct 205a within the preset time after the sealant is applied, thereby preventing the sealant from clogging the first duct 2. 05a; By providing a first anti-overflow adhesive portion 208a extending along the width direction of the membrane electrode 2 and / or a second anti-overflow adhesive portion 208b extending along the length direction of the membrane electrode 2 on the second boss 207 near the cathode reaction chamber and located on the outer side of the second sealing groove 301 near the cathode reaction chamber, the overflow path of the sealant through the gap between the second boss 207 and the mating surface of the cathode plate 3 in the second sealing groove 301 is effectively extended, thereby ensuring that the sealant cannot reach the second duct 207a within the preset time after the sealant is applied, thus avoiding the sealant from clogging the second duct 207a.

[0046] In an exemplary embodiment of this application, the anode first anti-overflow adhesive portion 206a, the anode second anti-overflow adhesive portion 206b, the cathode first anti-overflow adhesive portion 208a, and the cathode second anti-overflow adhesive portion 208b are all provided with a labyrinth structure.

[0047] In this embodiment, the first anti-overflow adhesive portion 206a of the anode, the second anti-overflow adhesive portion 206b of the anode, the first anti-overflow adhesive portion 208a of the cathode, and the second anti-overflow adhesive portion 208b of the cathode all adopt a labyrinth structure, which further extends the overflow path of the sealant and further ensures that the sealant cannot reach the first duct 205a and the second duct 207a. At the same time, the use of a labyrinth structure does not affect the reaction area of ​​the reaction zone.

[0048] In an exemplary embodiment of this application, the anode first anti-overflow adhesive portion 206a, the anode second anti-overflow adhesive portion 206b, the cathode first anti-overflow adhesive portion 208a, and the cathode second anti-overflow adhesive portion 208b all protrude from the membrane electrode 2 along the thickness direction. The anode plate 1 is provided with an anode first labyrinth groove 106 and an anode second labyrinth groove 107 for cooperating with the anode first anti-overflow adhesive portion 206a and the anode second anti-overflow adhesive portion 206b. The cathode plate 3 is provided with a cathode first labyrinth groove 306 and a cathode second labyrinth groove 307 for cooperating with the cathode first anti-overflow adhesive portion 208a and the cathode second anti-overflow adhesive portion 208b.

[0049] In this embodiment, the anode plate 1 is provided with a first anode labyrinth groove 106 and a second anode labyrinth groove 107, and the cathode plate 3 is provided with a first cathode labyrinth groove 306 and a second cathode labyrinth groove 307. This arrangement allows the anode first anti-overflow adhesive portion 206a, anode second anti-overflow adhesive portion 206b, cathode first anti-overflow adhesive portion 208a, and cathode second anti-overflow adhesive portion 208b protruding from the membrane electrode 2 to be accommodated in the anode first labyrinth groove 106 and anode second labyrinth groove 107, cathode first labyrinth groove 306, and cathode second labyrinth groove 307. This ensures that the anti-overflow adhesive structure fulfills the anti-overflow adhesive function during the single-cell glue injection and sealing process without affecting the volumetric power density of the single-cell structure.

[0050] In an exemplary embodiment of this application, the anode first anti-overflow adhesive portion 206a, the anode second anti-overflow adhesive portion 206b, the cathode first anti-overflow adhesive portion 208a, and the cathode second anti-overflow adhesive portion 208b all have similar structures, each including a strip-shaped main body 4 and a plurality of protruding teeth 401 connected to the side of the strip-shaped main body 4, the plurality of protruding teeth 401 being spaced apart along the length direction of the strip-shaped main body 4.

[0051] In this embodiment, by providing protruding teeth 401 on the strip-shaped body 4, the overflow path of the sealant can be effectively extended, while reducing the length of the strip-shaped body 4, thereby avoiding affecting the area ratio of the reaction zone of the single cell.

[0052] In an exemplary embodiment of this application, the first boss 205 and its corresponding anode first anti-overflow adhesive portion 206a and anode second anti-overflow adhesive portion 206b are integrally formed; the second boss 207 and its corresponding cathode first anti-overflow adhesive portion 208a and cathode second anti-overflow adhesive portion 208b are integrally formed, and the thickness of the first boss 205, anode first anti-overflow adhesive portion 206a, anode second anti-overflow adhesive portion 206b, second boss 207, cathode first anti-overflow adhesive portion 208a and cathode second anti-overflow adhesive portion 208b protruding from the film electrode 2 is the same.

[0053] In this embodiment, the first boss 205 and its corresponding anode first anti-overflow adhesive portion 206a and anode second anti-overflow adhesive portion 206b are integrally formed, the second boss 207 and its corresponding cathode first anti-overflow adhesive portion 208a and cathode second anti-overflow adhesive portion 208b are integrally formed, and the thickness of the protrusions facing the membrane electrode 2 is consistent, which can effectively reduce the processing difficulty, thereby improving the processing efficiency, and avoid the single cell bulging and warping caused by inconsistent design thickness, thus having the beneficial effect of avoiding affecting the service life of the single cell.

[0054] In an exemplary embodiment of this application, an anode plate 1 is provided with an anode mounting groove 108 corresponding to the first boss 205, and the anode mounting groove 108 is used to cooperate in mounting the first boss 205; a cathode plate 3 is provided with a cathode mounting groove 308 corresponding to the second boss 207, and the cathode mounting groove 308 is used to cooperate in mounting the second boss 207.

[0055] In this embodiment, an anode mounting groove 108 is provided on the anode plate 1 to accommodate the first protrusion 205, and a cathode mounting groove 308 is provided on the cathode plate 3 to accommodate the second protrusion 207. This allows the first protrusion 205 and the second protrusion 207 to be accommodated within the anode mounting groove 108 and the cathode mounting groove 308, reducing the thickness of the single cell and thus increasing the volumetric power density of the fuel cell. Furthermore, the cooperation between the protrusions and the mounting grooves effectively improves the tightness of the fit between the electrode plate and the membrane electrode 2, reducing the risk of relative displacement between the electrode plate and the membrane electrode 2, thereby reducing the beneficial effect of reducing the sealing failure of the sealing structure.

[0056] In an exemplary embodiment of this application, a first sealing groove 101 is disposed on the anode plate 1, and the opening of the first sealing groove 101 faces the membrane electrode 2. The first sealing groove 101 includes an anode main sealing groove 101a, an anode first sealing groove 101b disposed around the second gas channel, and an anode second sealing groove 101c disposed around the cooling water channel. The anode first sealing groove 101b and the anode second sealing groove 101c are both connected to the anode main sealing groove 101a. A second sealing groove 301 is disposed on the cathode plate 3, and the opening of the second sealing groove 301 faces the membrane electrode 2. The second sealing groove 301 includes a cathode main sealing groove 301a, a cathode first sealing groove 301b disposed around the first gas channel, and a cathode second sealing groove 301c disposed around the cooling water channel. The cathode first sealing groove 301b and the cathode second sealing groove 301c are both connected to the cathode main sealing groove 301a.

[0057] In this embodiment, the structural design of the first sealing groove 101 and the second sealing groove 301 allows the sealant to form an integrated sealing structure within the first sealing groove 101 and the second sealing groove 301 when sealant is injected into them. This avoids the formation of isolated seals at the medium channel, thus preventing the sealing structure from failing due to the residual reaction product (water) in the single cell and the expansion of water volume after freezing at low ambient temperatures. Furthermore, the structural design of the first sealing groove 101, including the anode main sealing groove 101a and the anode first sealing groove 101b and anode second sealing groove 101c connected to the anode main sealing groove 101a, ensures that the first sealing groove 101... 1. It can form a seal at the first boss 205, avoiding the gap between the first boss 205 and the anode reaction chamber, and can form a circumferential seal at the second gas channel and the cooling water channel, thereby avoiding internal leakage between the second gas, cooling water and the first gas; through the structural design of the second sealing groove 301 including the cathode main sealing groove 301a, and the cathode first sealing groove 301b and cathode second sealing groove 301c connected to the cathode main sealing groove 301a, the second sealing groove 301 can form a seal at the second boss 207, avoiding the gap between the second boss 207 and the cathode reaction chamber, and can form a circumferential seal at the first gas channel and the cooling water channel, thereby avoiding internal leakage between the first gas, cooling water and the second gas.

[0058] In an exemplary embodiment of this application, a plurality of anode plate reinforcing structures 101d protruding toward the membrane electrode 2 are distributed on the extension trajectory of the first sealing groove 101, and a plurality of cathode plate reinforcing structures 301d protruding toward the membrane electrode 2 are distributed on the extension trajectory of the second sealing groove 301. The anode plate reinforcing structures 101d and the cathode plate reinforcing structures 301d are disposed opposite to each other and both abut against the membrane electrode 2.

[0059] In this embodiment, the anode plate reinforcing structure 101d provided on the anode plate 1 can effectively improve the structural strength of the anode plate 1, and the cathode plate reinforcing structure 301d provided on the cathode plate 3 can effectively improve the structural strength of the cathode plate 3, thereby reducing the risk of warping and deformation of the electrode plates during transportation. During the formation of a single cell between the electrode plates and the membrane electrode 2, the anode plate reinforcing structure 101d and the cathode plate reinforcing structure 301d are arranged opposite to each other and both abut against the membrane electrode 2, thereby providing support for the membrane electrode 2. This avoids deformation and damage to the membrane electrode 2 due to excessive injection pressure during the sealing process of the single cell, thus preventing the membrane electrode 2 from failing due to reaction. This effectively improves the yield rate of single cell products.

[0060] In an exemplary embodiment of this application, the anode plate 1 is provided with an anode plate second gas channel boss 109 surrounding the second gas channel and an anode plate cooling water channel boss 110 surrounding the cooling water channel; the cathode plate 3 is provided with a cathode plate first gas channel boss 309 surrounding the first gas channel and a cathode plate cooling water channel boss 310 surrounding the cooling water channel.

[0061] In this embodiment, the anode plate second gas channel boss 109 and the anode plate cooling water channel boss 110 can effectively prevent sealant from overflowing from the first sealing groove 101 into the anode plate second gas channel 105 and the anode plate cooling water channel 104; the cathode plate first gas channel boss 309 and the cathode plate cooling water channel boss 310 can effectively prevent sealant from overflowing from the second sealing groove 301 into the cathode plate first gas channel 303 and the cathode plate cooling water channel 304.

[0062] This application also proposes a fuel cell single cell structure, including a fuel cell single cell anti-overflow adhesive structure, wherein the anode plate 1, the membrane electrode 2 and the cathode plate 3 are sealed and connected by injecting sealant into the first sealing groove 101 and the second sealing groove 301 to form the single cell structure.

[0063] This application also proposes a fuel cell stack consisting of multiple single-cell structures stacked together.

[0064] Working principle: By stacking the anode plate 1, membrane electrode 2, and cathode plate 3 in sequence, the basic framework of a single cell is formed. The membrane electrode 2 has a first protrusion 205 on the side facing the anode plate 1. When the sealant forms a sealing structure in the first sealing groove 101, the first protrusion 205 can effectively prevent the sealant from forming a seal between the first protrusion 205 and the anode reaction chamber. The first protrusion 205 has a first duct 205a for connecting the anode reaction chamber and the first gas channel. Since the membrane electrode 2 and the first protrusion 205 are die-cut... In this process, the anode plate 1 is manufactured using a stamping process. Therefore, when the first boss 205 mates with the mounting groove on the anode plate 1, there is a gap at the edge. Sealant can easily overflow from the first sealing groove 101 and flow into the first duct 205a, causing blockage. Therefore, by providing a first anti-overflow structure 206 on the first boss 205, the path of the sealant overflowing from the gap to the first duct 205a can be effectively extended, ensuring that the sealant cannot reach the first duct 205a within the preset time after injection. It has the beneficial effect of preventing the first duct 205a from becoming blocked; the membrane electrode 2 has a second protrusion 207 on the side facing the cathode plate 3. When the sealant forms a sealing structure in the second sealing groove 301, the second protrusion 207 can effectively avoid the sealant forming a seal between the second protrusion 207 and the cathode reaction chamber. The second protrusion 207 has a second duct 207a for connecting the cathode reaction chamber and the second gas channel. Since the membrane electrode 2 and the second protrusion 207 are made by die-cutting and the cathode plate 3 is made by stamping, the second protrusion 207... When 207 mates with the mounting groove of cathode plate 3 on cathode plate 3, there is a gap at the edge. The sealant can easily overflow from the second sealing groove 301 and flow into the second duct 207a, causing the second duct 207a to become blocked. Therefore, by setting a second anti-overflow sealant structure 208 on the second boss 207, the path of the sealant overflowing from the gap to the second duct 207a can be effectively extended, thereby ensuring that the sealant cannot reach the second duct 207a within the preset time after the sealant is applied, thus having the beneficial effect of preventing the second duct 207a from becoming blocked.

[0065] The above embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention.

Claims

1. A fuel cell single cell spill resistant seal structure, characterized by, The application relates to a fuel cell, which comprises: an anode plate, a membrane electrode and a cathode plate which are stacked in sequence, a first sealing groove is arranged between the anode plate and the membrane electrode, the anode plate has an anode reaction cavity formed in a region surrounded by the first sealing groove, a second sealing groove is arranged between the cathode plate and the membrane electrode, the cathode plate has a cathode reaction cavity formed in a region surrounded by the second sealing groove, the anode plate, the membrane electrode and the cathode plate are correspondingly provided with a first gas channel, a second gas channel and a cooling water channel, a first boss which surrounds the first gas channel is arranged on a side of the membrane electrode which faces the anode plate, a first channel is arranged on a side of the first boss which is close to the anode reaction cavity, the first channel is used for connecting the anode reaction cavity and the first gas channel, the first sealing groove is located at the periphery of the first boss and avoids the side of the first boss which faces the anode reaction cavity, a first sealant overflow prevention structure is arranged on the inner side of the first sealing groove between the anode plate and the membrane electrode and is used for preventing sealant from flowing into the first channel from the first sealing groove, a second boss which surrounds the second gas channel is arranged on a side of the membrane electrode which faces the cathode plate, a second channel is arranged on a side of the second boss which is close to the cathode reaction cavity, the second channel is used for connecting the cathode reaction cavity and the second gas channel, the second sealing groove is located at the periphery of the second boss and avoids the side of the second boss which faces the cathode reaction cavity, a second sealant overflow prevention structure is arranged on the inner side of the second sealing groove between the cathode plate and the membrane electrode and is used for preventing sealant from flowing into the second channel from the second sealing groove. The first sealant overflow prevention structure comprises an anode first sealant overflow prevention part which extends along the width direction of the membrane electrode from the side of the first boss which is close to the anode reaction cavity and / or an anode second sealant overflow prevention part which extends along the length direction of the membrane electrode from the side of the first boss which is close to the anode reaction cavity, the second sealant overflow prevention structure comprises a cathode first sealant overflow prevention part which extends along the width direction of the membrane electrode from the side of the second boss which is close to the cathode reaction cavity and / or a cathode second sealant overflow prevention part which extends along the length direction of the membrane electrode from the side of the first boss which is close to the anode reaction cavity. The anode first sealant overflow prevention part, the anode second sealant overflow prevention part, the cathode first sealant overflow prevention part and the cathode second sealant overflow prevention part are all provided with a labyrinth structure. The anode first sealant overflow prevention part, the anode second sealant overflow prevention part, the cathode first sealant overflow prevention part and the cathode second sealant overflow prevention part all protrude from the membrane electrode in the thickness direction, the anode plate is provided with an anode first labyrinth groove and an anode second labyrinth groove which are used for cooperating with the anode first sealant overflow prevention part and the anode second sealant overflow prevention part, and the cathode plate is provided with a cathode first labyrinth groove and a cathode second labyrinth groove which are used for cooperating with the cathode first sealant overflow prevention part and the cathode second sealant overflow prevention part.

2. The fuel cell unit spill resistant gasket structure of claim 1, wherein: ​ 3. The fuel cell unit spill resistant gasket structure of claim 2, wherein: The anode first anti-overflow glue part, the anode second anti-overflow glue part, the cathode first anti-overflow glue part and the cathode second anti-overflow glue part are similar in structure, and each includes a strip-shaped main body and a plurality of protrusions connected to the side of the strip-shaped main body, and the plurality of protrusions are distributed along the length direction of the strip-shaped main body.

4. The fuel cell unit spill resistant gasket structure of claim 3, wherein: The first protrusion and the corresponding anode first anti-overflow glue part and anode second anti-overflow glue part are integrally formed; the second protrusion and the corresponding cathode first anti-overflow glue part and cathode second anti-overflow glue part are integrally formed, and the first protrusion, the anode first anti-overflow glue part, the anode second anti-overflow glue part, the second protrusion, the cathode first anti-overflow glue part and the cathode second anti-overflow glue part protrude from the thickness of the membrane electrode.

5. The fuel cell unit spill resistant gasket structure of claim 1, wherein: An anode mounting groove corresponding to the first protrusion is arranged on the anode plate, and the anode mounting groove is used to cooperatively mount the first protrusion; a cathode mounting groove corresponding to the second protrusion is arranged on the cathode plate, and the cathode mounting groove is used to cooperatively mount the second protrusion.

6. The fuel cell unit spill resistant gasket structure of claim 1, wherein: The first sealing groove is arranged on the anode plate, and the opening of the first sealing groove faces the membrane electrode, the first sealing groove includes an anode main sealing groove, an anode first sealing groove arranged around the second gas channel, and an anode second sealing groove arranged around the cooling water channel, and the anode first sealing groove and the anode second sealing groove are in communication with the anode main sealing groove; the second sealing groove is arranged on the cathode plate, and the opening of the second sealing groove faces the membrane electrode, the second sealing groove includes a cathode main sealing groove, a cathode first sealing groove arranged around the first gas channel, and a cathode second sealing groove arranged around the cooling water channel, and the cathode first sealing groove and the cathode second sealing groove are in communication with the cathode main sealing groove.

7. The fuel cell unit spill resistant gasket structure of claim 1, wherein: A plurality of anode plate reinforcing structures protruding towards the membrane electrode are distributed on the extension track of the first sealing groove, and a plurality of cathode plate reinforcing structures protruding towards the membrane electrode are distributed on the extension track of the second sealing groove, the anode plate reinforcing structures and the cathode plate reinforcing structures are oppositely arranged, and both abut against the membrane electrode.

8. The fuel cell unit spill resistant gasket structure of claim 7, wherein: An anode plate second gas channel protrusion is arranged around the second gas channel on the anode plate, and an anode plate cooling water channel protrusion is arranged around the cooling water channel on the anode plate; a cathode plate first gas channel protrusion is arranged around the first gas channel on the cathode plate, and a cathode plate cooling water channel protrusion is arranged around the cooling water channel on the cathode plate.

9. A fuel cell cell structure comprising the fuel cell cell gasket structure according to any one of claims 1 to 8, characterized by: The anode plate, the membrane electrode and the cathode plate are sealed and connected to form the single cell structure by injecting sealing glue into the first sealing groove and the second sealing groove.

10. A fuel cell cell stack, characterized by: A plurality of single cell structures as claimed in claim 9 are stacked.

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