Unipolar plates, battery cells and fuel cells

Abstract

The present application provides a unipolar plate, a single cell, and a fuel cell. The unipolar plate includes a plate body having a first direction and a second direction intersecting each other; the plate body is constructed with a plurality of ridges and a plurality of grooves for coolant flow; the plurality of grooves are spaced apart in the first direction, with adjacent grooves separated by a ridge; at least one of the plurality of ridges is formed with a recessed pit recessed toward the second direction; and a temperature-sensitive deformable element connected to the plate body and disposed within the recessed pit; the temperature-sensitive deformable element is configured to be in a first state when the temperature difference across the ridge reaches a preset temperature difference, and in a second state when the temperature difference across the ridge is lower than the preset temperature difference; when the temperature-sensitive deformable element is in the first state, the recessed pit has a first flow cross-sectional area; when the temperature-sensitive deformable element is in the second state, the recessed pit has a second flow cross-sectional area; the first flow cross-sectional area is greater than the second flow cross-sectional area. The present application addresses the technical problem of uneven coolant flow in the prior art.

Description

Technical Field

[0001] The present application relates to the technical field of fuel cells, and in particular to a monopolar plate, a battery cell and a fuel cell. Background Art

[0002] The power generation principle of a hydrogen fuel cell is that hydrogen, under the action of an anode catalyst, generates hydrogen ions and releases electrons. The hydrogen ions pass through a proton exchange membrane to the cathode, while the electrons are collected by a current collector plate and flow to the cathode through an external circuit. The oxidizing gas (air or oxygen) is reduced by the cathode catalyst and combines with the hydrogen ions and external circuit electrons to form water. During the electrochemical reaction, hydrogen fuel cells generate heat, which adversely affects the battery's power generation efficiency. Therefore, heat dissipation is essential for the fuel cell.

[0003] In the prior art, due to the different flow resistances between the various coolant flow channels, the coolant is more likely to flow from the flow channel with large flow resistance to the flow channel with small flow resistance. In this way, less coolant flows through the flow channel with large flow resistance, which is prone to overheating; or the coolant has uneven flow, resulting in temperature unevenness of the single battery cell with localized excessive temperature, resulting in poor cooling effect. Summary of the Invention

[0004] The present application provides a monopolar plate, a battery cell and a fuel cell, aiming to solve the technical problem in the prior art of poor cooling effect caused by uneven flow of coolant or different flow resistance.

[0005] To this end, the present application provides a monopolar plate, comprising:

[0006] a plate body having a first direction and a second direction intersecting each other; the plate body being configured with a plurality of ridges and a plurality of grooves for coolant flow; the plurality of grooves being spaced apart in the first direction, with adjacent two grooves being separated by the ridges; and at least one of the plurality of ridges being formed with a recessed pit concave toward the second direction; and

[0007] A temperature-sensitive deformation member is connected to the plate body and is arranged in the pit; the temperature-sensitive deformation member is configured to be in a first state when the temperature difference between the two sides of the plate body reaches a preset temperature difference, and to be in a second state when the temperature difference between the two sides of the ridge is lower than the preset temperature difference; when the temperature-sensitive deformation member is in the first state, the pit has a first flow cross-sectional area; when the temperature-sensitive deformation member is in the second state, the pit has a second flow cross-sectional area; the first flow cross-sectional area is greater than the second flow cross-sectional area.

[0008] Optionally, the plate body has a third direction intersecting both the first direction and the second direction, and the plurality of ridges and the plurality of grooves extend in a winding manner along the third direction;

[0009] The ridge has a plurality of peaks and a plurality of valleys alternately arranged along the third direction; two adjacent peaks are connected by one valley; and the pit is formed in at least one of the plurality of valleys.

[0010] Optionally, on the same ridge, the number of the pits is N, the number of the temperature-sensitive deformation members is M, and the number of the valleys is L; wherein M≤N≤L.

[0011] Optionally, the pit is provided in one of two adjacent valleys in the third direction; and the temperature-sensing deformation member is provided in one of two adjacent pits in the third direction.

[0012] Optionally, the plurality of ridges include a first ridge and a second ridge adjacent to each other in the first direction; wherein the pit on the first ridge and the pit on the second ridge are staggered in the third direction.

[0013] Optionally, the pit has a first depth in the second direction, the groove has a second depth in the second direction, and the first depth is smaller than the second depth.

[0014] Optionally, the recess has a first side wall and a second side wall that are oppositely disposed;

[0015] One end of the temperature-sensing deformable member is connected to the first side wall, and the other end is a movable end; wherein, when the temperature difference between the two sides of the plate body reaches the preset temperature difference, the temperature-sensing deformable member bends along the first direction, so that the movable end moves away from the second side wall and breaks contact with the second side wall; when the temperature difference between the two sides of the ridge is lower than the preset temperature difference, the temperature-sensing deformable member recovers its deformation, so that the movable end contacts the second side wall.

[0016] Optionally, the temperature-sensitive deformation member is a memory alloy or a bimetallic strip.

[0017] In a second aspect, the present application further proposes a battery cell comprising a cathode plate, an anode plate, and a membrane electrode assembly disposed between the cathode plate and the anode plate; wherein the cathode plate and / or the anode plate adopts the monopolar plate as described above.

[0018] In a third aspect, the present application also proposes a fuel cell comprising the battery cell as described above.

[0019] In the technical solution of the embodiment of the present application, a pit is provided on the ridge between two adjacent grooves, and a temperature-sensitive deformable element is placed in the pit. When the temperature difference between the ridges reaches a preset temperature difference, the temperature-sensitive deformable element changes state, and the flow cross section of the pit increases. When the temperature difference between adjacent grooves is large, the flow cross section of the pit increases, and coolant is supplied from the low-temperature groove to the high-temperature groove. When the temperature difference between adjacent grooves is small, the pit cross section is very small (or the flow path is closed). In this way, even if the coolant pressure in adjacent grooves is different, the high-pressure groove will not flow into the low-pressure groove, thus preventing the high-pressure groove from overheating due to insufficient coolant. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 Schematic diagram of the structure of the monopolar plate provided in the embodiment of the present application;

[0022] Figure 2 is a schematic structural diagram of the temperature-sensitive deformation member in a first state;

[0023] Figure 3 is a schematic structural diagram of the temperature-sensitive deformation member in the second state;

[0024] Figure 4 It is a schematic diagram of the structure of the ridge.

[0025] Reference Signs List

[0026] 110 ridges 111b First side wall 120 groove 112 Tanibe 130 Temperature-sensitive deformation parts 113 Peak 111 pits 131 Activity terminal 111a Second side wall 132 Fixed end DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0029] In this application, the word "exemplary" is used to mean "serving as an example, illustration, or illustration." Any embodiment described in this application as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is given to enable any person skilled in the art to make and use the invention. In the following description, details are listed for the purpose of explanation. It should be understood that one of ordinary skill in the art will recognize that the invention can be practiced without these specific details. In other instances, well-known structures and processes are not described in detail to avoid obscuring the description of the invention with unnecessary detail. Therefore, the present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.

[0030] A fuel cell includes a plurality of stacked single cells. Each single cell includes a cathode plate, an anode plate, and a membrane electrode sandwiched between the cathode plate and the anode plate. The cathode plate of one of any two adjacent single cells is arranged close to the anode plate of the other, and defines a cooling channel for the flow of coolant. In the prior art, the cooling side of the cathode plate and / or anode plate (monopolar plate) is constructed with a plurality of grooves for the flow of coolant. However, when the flow of coolant between the grooves is uneven, the temperature difference on both sides of the ridge is unevenly distributed, and local high temperatures appear in some locations. For example, when a part of the grooves is blocked, there is a situation where there is no coolant flow downstream of this part of the grooves, resulting in uneven coolant flow, which in turn leads to local high temperatures, making it impossible for the fuel cell to dissipate heat, which directly leads to poor heat dissipation effect. For this reason, the present application proposes a monopolar plate to solve the technical problem that the blockage of the grooves causes uneven coolant flow, which in turn causes poor heat dissipation effect of the fuel cell.

[0031] Specifically, if Figure 1 and Figure 2 As shown, the embodiment of the present application provides a monopolar plate, comprising:

[0032] A plate body having a first direction and a second direction intersecting each other; the plate body is configured with a plurality of ridges 110 and a plurality of grooves 120 for coolant flow; the plurality of grooves 120 are spaced apart in the first direction, and two adjacent grooves 120 are separated by the ridges 110; at least one of the plurality of ridges 110 is formed with a pit 111 that is concave toward the second direction; and

[0033] The temperature-sensitive deformation member 130 is connected to the plate body and is disposed in the recess 111; the temperature-sensitive deformation member 130 is configured to be in a first state when the temperature difference between the two sides of the ridge 110 reaches a preset temperature difference, and to be in a second state when the temperature difference between the two sides of the ridge 110 is lower than the preset temperature difference; Figure 2 As shown, when the temperature-sensitive deformation member 130 is in the first state, the pit 111 has a first flow cross-sectional area; Figure 3 As shown, when the temperature-sensitive deformation member 130 is in the second state, the recess 111 has a second flow cross-sectional area; the first flow cross-sectional area is greater than the second flow cross-sectional area.

[0034] Taking the blockage of the groove 120 as an example, in the embodiment of the present application, when none of the multiple grooves 120 are blocked, the coolant in each groove 120 flows evenly (the term "evenly" here should be understood as approximately even, not absolutely even). In this case, the temperature on both sides of the ridge 110 is approximately even, without any local high temperature phenomenon. When the temperature-sensing deformable member 130 is in the second state, the recess 111 has a second flow cross-sectional area. If the second flow cross-sectional area is not set to 0, the coolant in the groove 120 can also flow through the recess 111 to appropriately replenish the coolant in the groove 120 that is lacking coolant. The second flow cross-sectional area can also be 0, that is, the coolant in adjacent grooves 120 cannot be replenished through the recess 111 when the temperature-sensing deformable member 130 is in the second state. When a groove 120 is blocked, the coolant cannot or only a small part of it flows into the groove 120 downstream of the groove 120, causing the temperature of the plate at the corresponding position to gradually increase due to the lack of coolant flowing through the groove 120 downstream of the groove 120; when the temperature difference on both sides of the ridge 110 is higher than the preset temperature difference, the temperature-sensing deformable part 130 begins to change from the second state to the first state. At this time, the flow cross-sectional area of ​​the pit 111 becomes larger, and the coolant can be introduced from the adjacent groove 120 of the groove 120, or the coolant in the adjacent groove 120 can flow more into the blocked groove 120, so as to achieve the purpose of making the coolant flow as uniform as possible.

[0035] In summary, the state of the temperature-sensitive deformable element 130 changes when the temperature difference between the ridge 110 reaches a preset temperature difference, and the flow cross-section of the pit 111 becomes larger. At this time, when the temperature difference between adjacent grooves 120 is large, the flow cross-section of the pit 111 becomes larger, and coolant is replenished from the low-temperature groove 120 to the high-temperature groove 120. When the temperature difference between adjacent grooves 120 is small, the cross-section of the pit 111 is very small (or the flow path is closed). In this way, even if the coolant pressure of adjacent grooves 120 is different, the high-pressure groove 120 will not flow to the low-pressure groove 120, thereby preventing the high-pressure groove 120 from overheating due to insufficient coolant.

[0036] It should be noted that the temperature-sensitive deformable member 130 has the function of producing a shape change at a specified temperature. Generally speaking, the temperature-sensitive deformable member 130 can be a memory alloy or a bimetallic strip. In the embodiment of the present application, the preset temperature difference is a parameter determined by a person skilled in the art based on the performance of the fuel cell. After training, the memory alloy or bimetallic strip will deform when the temperature reaches the preset temperature difference, thereby changing the flow cross-section of the pit 111, thereby introducing the coolant in the adjacent groove 120 into the clogged groove 120, so that the coolant flow is replenished in time downstream of the clogged groove 120, so as to achieve the coolant flowing as evenly as possible in each groove 120, thereby reducing the possibility of local high temperature, improving the power generation efficiency of the fuel cell and reducing the accident rate and failure rate of the fuel cell.

[0037] It should be noted that, generally, the second state of the memory alloy or bimetallic strip when the temperature is lower than the preset temperature difference is usually a straight state, occupying more space in the pit 111, so the second flow cross-sectional area of ​​the pit 111 is smaller; the first state of the memory alloy or bimetallic strip when the temperature is lower than the preset temperature difference is usually a bent state, occupying less space in the pit 111, so the first flow cross-sectional area of ​​the pit 111 is larger, and more coolant will be introduced into the clogged groove 120.

[0038] The above embodiment uses the blockage of the groove 120 as an example to illustrate the technical solution of the present application. There are other reasons for the uneven flow of the coolant. For example, before the coolant enters the cooling channel, the coolant first enters the coolant distribution area. Since the entrance of a part of the groove 120 is far away from the coolant inlet of the coolant distribution area, the coolant entering this part of the groove 120 is also less, and the coolant in the groove 120 close to the coolant inlet of the coolant distribution area is more; for this reason, after the coolant enters the groove 120, the coolant can pass through the pit 111 on the ridge 110 to complement each other between the grooves 120 when the temperature-sensitive deformable part 130 is deformed, so as to reduce the unevenness of the coolant flow.

[0039] To sum up, in the technical solution of the embodiment of the present application, a pit 111 is provided on the ridge 110 between two adjacent grooves 120, and a temperature-sensitive deformable part 130 is provided in the pit 111, which can change according to the temperature; the temperature-sensitive deformable part 130 changes its state when the temperature of the plate reaches a preset temperature difference, and the flow cross-section of the pit 111 becomes larger, so that the coolant between the adjacent grooves 120 can supplement each other, so as to achieve the purpose of making the coolant flow between the grooves 120 as uniform as possible, thereby avoiding the local temperature rise of the plate due to lack of coolant in a certain groove 120, and improving the heat dissipation effect.

[0040] It should be noted that, in general, the first direction is the width direction of the plate body, and the second direction is the thickness direction of the plate body. In an embodiment of the present application, the plate body has a first side surface and a second side surface that are relatively arranged in the second direction, the first side surface is used to construct a channel for the flow of coolant, and the second side surface is used to construct a channel for the flow of gas (oxidizing gas or hydrogen). The groove 120 is formed by stamping, and the stamping force acts on the first side surface along the second direction toward the second side surface; the ridge 110 is formed by stamping, and the stamping force acts on the second side surface along the first direction toward the first side surface, and a groove for gas flow is formed on the second side surface. The pit 111 is formed by stamping on the ridge 110 along the second direction toward the second side surface, and a protrusion is formed in the groove.

[0041] As an optional implementation of the above embodiment, the plate has a third direction that intersects both the first direction and the second direction, such as Figure 4 As shown, the plurality of ridges 110 and the plurality of grooves 120 all extend in a winding manner along the third direction; in the embodiment, generally speaking, the third direction is the length direction of the plate body. The plurality of ridges 110 and the plurality of grooves 120 are all arranged in a winding manner along the length direction. The winding grooves 120 can increase the flow distance of the coolant in the cooling channel, so that the coolant can fully exchange heat with the plate body to improve the heat dissipation effect. The winding ridges 110 correspond to the winding grooves for gas flow on the gas flow channel side of the plate body, which can promote the diffusion of gas toward the membrane electrode assembly during the winding flow.

[0042] In an embodiment, the ridge 110 has a plurality of peaks 113 and a plurality of valleys 112 alternately arranged along the third direction; two adjacent peaks 113 are connected by a valley 112; and at least one of the valleys 112 is formed with a pit 111. The pit 111 corresponds to a protrusion in the gully where the gas flows on the other side of the plate body, and the protrusion has the function of lifting the gas so that the gas diffuses toward the membrane electrode assembly; moreover, the protrusion is arranged in the valley 112 mainly because in a specific application process, the valley 112 is located on the lower side of the gravity direction relative to the peak 113, and the position of the gully on the gas side corresponding to the valley 112 is prone to water accumulation. Therefore, the protrusion corresponding to the pit 111 can reduce the amount of water accumulation and has the function of lifting the gas so that the gas can easily diffuse into the adjacent gully and diffuse toward the membrane electrode assembly.

[0043] As an optional implementation of the above embodiment, on the same ridge 110, the number of the pits 111 is N, the number of the temperature-sensitive deformation members 130 is M, and the number of the valleys 112 is L; wherein M≤N≤L. Under normal circumstances, the number of pits 111 is generally set to be smaller than the number of valleys 112. That is, pits 111 are only provided in a portion of the valleys 112. Providing pits 111 in the valleys 112 will form bulges in the gullies on the gas side, and the bulges will cause the gas pressure to increase at the bulges. Therefore, in order to reduce the area of ​​local excessive pressure, not all valleys 112 are generally provided with pits 111; for example, only one pit 111 is provided between adjacent valleys 112.

[0044] The number of temperature-sensitive deformable elements 130 is set to be less than the number of pits 111. That is, the temperature-sensitive deformable elements 130 are only installed in a portion of the pits 111. This is mainly due to the consideration that during the flow of coolant, due to the certain unevenness of the coolant distributed in the coolant distribution area, the coolant can flow through the pits 111 without the temperature-sensitive deformable elements 130 to the adjacent grooves 120, so that the coolant in the grooves 120 is as uniform as possible. The location of the temperature-sensitive deformable elements 130 can be specifically set based on flow field simulation experiments. Generally, the temperature-sensitive deformable elements 130 need to be installed in the area located in the center of the flow channel area.

[0045] Of course, in some embodiments, for example, the ridge 110 located in the middle of the electrochemical reaction zone generates more heat and requires the most gas. Therefore, M, N, and L may satisfy M = N = L for the ridge 110 located in the middle of the electrochemical reaction zone. For example, on the central ridge 110, each valley 112 is provided with a recess 111, and each recess 111 is provided with a temperature-sensitive deformation member 130.

[0046] As an alternative embodiment to the above embodiment, one of the two adjacent valleys 112 in the third direction is provided with the pit 111; and one of the two adjacent pits 111 in the third direction is provided with the temperature-sensitive deformation member 130. To balance manufacturing costs and facilitate standardized mold configuration, in this embodiment, one of the two adjacent valleys 112 in the third direction is provided with the pit 111. That is, the pits 111 are arranged in the following manner: valley 112 (pit 111) - valley 112 - valley 112 (pit 111) - valley 112... valley 112 (pit 111) - valley 112. In order to ensure that the coolant can replenish each other in the groove 120 during the flow of the coolant without being blocked in the groove 120, one of the two adjacent pits 111 is provided with the temperature-sensing deformation member 130, that is, the temperature-sensing deformation member 130 is arranged as follows: pit 111 (temperature-sensing deformation member 130)-pit 111-pit 111 (temperature-sensing deformation member 130)-pit 111...pit 111 (temperature-sensing deformation member 130)-pit 111.

[0047] As an alternative embodiment to the above embodiment, the plurality of ridges 110 include a first ridge 110 and a second ridge 110 adjacent to each other in the first direction. The pits 111 on the first ridge 110 and the pits 111 on the second ridge 110 are staggered in the third direction. The staggered arrangement of the pits 111 on two adjacent ridges 110, i.e., the staggered arrangement of the protrusions in two adjacent grooves, can create low-pressure areas on either side of the protrusions in the first direction. The increased gas pressure caused by the protrusions creates a pressure differential, which in turn motivates the gas to diffuse in the second direction, thereby promoting diffusion.

[0048] As an alternative embodiment to the above embodiment, the dimple 111 has a first depth in the second direction, and the groove 120 has a second depth in the second direction, wherein the first depth is less than the second depth. It should be noted that the dimple 111 corresponds to a protrusion within the groove, and the groove 120 corresponds to a ridge on the gas flow path side. When viewed from the gas flow path side, the protrusion within the groove is not higher than the protruding ridge and is completely located within the groove. This increases gas pressure without causing gas blockage, thereby achieving gas diffusion.

[0049] As an alternative embodiment to the above embodiment, the recess 111 has a first sidewall 111b and a second sidewall 111a disposed opposite each other in the longitudinal direction. The temperature-sensitive deformable member 130 has a fixed end 132 fixedly connected to the first sidewall 111b at one end and a movable end 131 at the other end. For example, the temperature-sensitive deformable member 130 may be welded to the first sidewall 111b, while the other end may be a movable end 131. This allows the position of the movable end 131 to change when the temperature-sensitive deformable member 130 changes state, thereby changing the flow cross-sectional area of ​​the recess 111. When the temperature difference across the ridge 110 reaches the predetermined temperature difference, the temperature-sensitive deformable member 130 bends along the first direction, causing the movable end 131 to move away from the second sidewall 111a and disengage from it. This reduces the space occupied by the movable end 131 in the recess 111, leaving a smaller flow cross-sectional area for coolant flow. The temperature-sensing deformable member 130 recovers its deformation when the temperature difference between the two sides of the ridge 110 is lower than the preset temperature difference, so that the movable end 131 contacts the second side wall 111a. At this time, the temperature-sensing deformable member 130 occupies the entire space of the pit 111, so that the coolant cannot flow from the pit 111 to the other groove 120.

[0050] The embodiment of the present application proposes a battery cell, comprising a cathode plate, an anode plate and a membrane electrode assembly arranged between the cathode plate and the anode plate. The cathode plate and / or the anode plate is a monopolar plate that adopts part or all of the aforementioned embodiments. In the embodiment, the membrane electrode assembly is arranged between the cathode plate and the anode plate, and the membrane electrode assembly is located on the side of the cathode plate having the gas separation area, the drainage area and the capillary groove 120. Generally speaking, the membrane electrode assembly includes a cathode catalyst layer, a proton exchange membrane and an anode catalyst layer. The cathode catalyst layer is located on the side of the proton exchange membrane facing the cathode, and the anode catalyst layer is located on the side of the proton exchange membrane facing the anode. A sealing structure is also provided between the cathode plate and the anode plate. The sealing structure is not a structure to be improved in this application and will not be described in detail here.

[0051] In the embodiment, the groove 120 , the ridge 110 and the temperature-sensitive deformation member 130 are all located on the outside of the battery cell to define a cooling channel after being assembled with another battery cell.

[0052] The embodiments of the present application also provide a fuel cell, including a battery cell. The battery cell adopts part or all of the technical solutions of the aforementioned embodiments, and thus has the technical advantages and all of the technical advantages of the aforementioned embodiments. In the embodiments, the battery cell is generally multiple, and multiple battery cells are stacked. In two adjacent battery cells, the cathode plate of one battery cell and the anode plate of the other battery cell are arranged relative to each other to form a coolant channel, wherein the cathode plate of one battery cell and / or the anode plate of the other battery cell adopt the structure of the monopolar plate in part or all of the aforementioned embodiments.

[0053] The fuel cell also includes structures such as seals, end plates and tie rods. These structures are not the focus of improvement in this application and will not be described in detail here.

[0054] The above is a detailed introduction to a monopolar plate, a single cell and a fuel cell provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A monopolar plate, characterized in that: include: A plate body having a first direction and a second direction intersecting each other; the plate body is configured with a plurality of ridges and a plurality of grooves for cooling liquid to flow; The plurality of grooves are spaced apart in the first direction, and two adjacent grooves are separated by the ridge; At least one of the plurality of ridges is formed with a pit recessed toward the second direction; as well as a temperature-sensitive deformation member connected to the plate body and disposed in the recess; the temperature-sensitive deformation member is configured to be in a first state when the temperature difference between the two sides of the ridge reaches a preset temperature difference, and to be in a second state when the temperature difference between the two sides of the ridge is lower than the preset temperature difference; when the temperature-sensitive deformation member is in the first state, the recess has a first flow cross-sectional area; when the temperature-sensitive deformation member is in the second state, the recess has a second flow cross-sectional area; the first flow cross-sectional area is greater than the second flow cross-sectional area; The recess has a first side wall and a second side wall that are oppositely disposed; One end of the temperature-sensitive deformable member is connected to the first side wall, and the other end is a movable end; wherein, when the temperature difference between the two sides of the ridge reaches the preset temperature difference, the temperature-sensitive deformable member bends along the first direction, so that the movable end moves away from the second side wall and breaks contact with the second side wall; The temperature-sensitive deformation member recovers its deformation when the temperature difference between the two sides of the ridge is lower than the preset temperature difference, so that the movable end contacts the second side wall.

2. The monopolar plate according to claim 1, wherein: The plate body has a third direction intersecting both the first direction and the second direction, and the plurality of ridges and the plurality of grooves extend along the third direction; The ridge has a plurality of peaks and a plurality of valleys alternately arranged along the third direction; two adjacent peaks are connected by one valley; and the pit is formed in at least one of the plurality of valleys.

3. The monopolar plate according to claim 2, wherein: On the same ridge, the number of the pits is N, the number of the temperature-sensitive deformation members is M, and the number of the valleys is L; wherein M≤N≤L.

4. The monopolar plate according to claim 3, wherein: The pit is provided in one of two valleys adjacent to each other in the third direction; and the temperature-sensitive deformation member is provided in one of two pits adjacent to each other in the third direction.

5. The monopolar plate according to claim 2, wherein: The plurality of ridges include a first ridge and a second ridge adjacently disposed in the first direction; Wherein, the pit on the first convex ridge and the pit on the second convex ridge are staggered in the third direction.

6. The monopolar plate according to claim 1, wherein: The pit has a first depth in the second direction, and the groove has a second depth in the second direction, the first depth being smaller than the second depth.

7. The monopolar plate according to claim 1, wherein: The temperature-sensitive deformation member is a memory alloy or a bimetallic strip.

8. A battery cell, characterized in that: The invention comprises a cathode plate, an anode plate and a membrane electrode assembly arranged between the cathode plate and the anode plate; wherein the cathode plate and / or the anode plate is a monopolar plate according to any one of claims 1 to 7.

9. A fuel cell, characterized in that: The invention comprises a plurality of battery cells according to claim 8.

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