Single cell fabrication method, fuel cell stack and fuel cell

Abstract

This application provides a method for fabricating a single cell, a fuel cell stack, and a fuel cell. The method for fabricating a single cell includes: providing a first monopole plate and a membrane electrode assembly (MEA); applying an adhesive film to the side of the MEA facing the first monopole plate; bending at least one end of the first monopole plate in a direction away from the MEA, such that the first monopole plate has a first bonding portion adjacent to the MEA and at least one first curved portion away from the MEA; bonding the first bonding portion to the corresponding part of the MEA, and placing the MEA at a predetermined angle to the horizontal plane, with at least one first curved portion of the first monopole plate located below the first bonding portion; gradually restoring the deformation of the first curved portion located below the first bonding portion, so that the first curved portion located below the first bonding portion gradually bonds to the MEA. This application can avoid the phenomenon of sealing failure caused by air bubbles at the bonding point between the metal plate and the MEA frame.

Description

Technical Field

[0001] This application relates to the field of fuel cell technology, specifically to a method for preparing a single cell, a fuel cell stack, and a fuel cell. Background Technology

[0002] Currently, in fuel cell stacks, the membrane electrode assembly (MEA) is flanked by a cathode plate and an anode plate, respectively. A hydrogen flow field is formed between the anode plate and the MEA, while an oxygen flow field is formed between the cathode plate and the MEA. During the reaction, the hydrogen gas at the MEA on the anode plate side reacts to generate protons. These protons then pass through the MEA and react with the oxygen at the cathode plate side to generate water. Maintaining a tight seal between the anode plate and the MEA, and between the cathode plate and the MEA, is crucial for ensuring the stable operation of the reaction.

[0003] Therefore, currently, a large area of ​​adhesive film needs to be bonded between the metal electrode plate and the membrane electrode frame to ensure the sealing of the reactant gas. However, due to the large bonding area between the metal electrode plate and the membrane electrode frame, air bubbles are prone to appear at the bonding point, which can easily affect the sealing between the metal electrode plate and the membrane electrode. Summary of the Invention

[0004] This application provides a method for preparing a single cell, a fuel cell stack, and a fuel cell, aiming to solve the technical problem that air bubbles easily appear at the bonding point between the metal plates and the membrane electrode frame.

[0005] In a first aspect, this application provides a method for preparing a single-cell battery, comprising:

[0006] A first monopolar plate and a membrane electrode are provided, with a film coated on one side of the membrane electrode;

[0007] The first monopolar plate is disposed on the side of the membrane electrode coated with adhesive film, and at least one end of the first monopolar plate is bent in a direction away from the membrane electrode, so that the first monopolar plate has a first bonding portion adjacent to the membrane electrode and at least one first bending portion away from the membrane electrode.

[0008] The first bonding portion is bonded to the corresponding part of the membrane electrode, and the membrane electrode is placed at a preset angle with the horizontal plane. At least one first curved portion of the first monopole plate is located below the first bonding portion. The preset angle is greater than or equal to 30° and less than or equal to 90°.

[0009] The deformation of the first curved portion located below the first bonding portion is gradually restored so that the first curved portion located below the first bonding portion gradually adheres to the membrane electrode.

[0010] In some embodiments, the step of bending at least one end of the first monopolar plate in a direction away from the membrane electrode, such that the first monopolar plate has a first bonding portion adjacent to the membrane electrode and a first bending portion away from the membrane electrode, includes:

[0011] The first monopolar plate is bent at both ends in a direction away from the membrane electrode, so that the first monopolar plate has a first bonding portion adjacent to the membrane electrode, a first sub-bending portion away from the membrane electrode, and a second sub-bending portion.

[0012] The steps of attaching the first bonding portion to the corresponding part of the membrane electrode and placing the membrane electrode at a predetermined angle to the horizontal plane, with at least one first curved portion of the first monopolar plate located below the first bonding portion, include:

[0013] The first bonding part is bonded to the corresponding part of the membrane electrode, and the membrane electrode is placed at a preset angle with the horizontal plane. The first sub-bending part is located below the first bonding part, and the second sub-bending part is located above the first bonding part. The preset angle is greater than or equal to 30° and less than or equal to 90°.

[0014] The step of gradually restoring the deformation of the first curved portion located below the first bonding portion, so that the first curved portion located below the first bonding portion gradually bonds with the membrane electrode, includes:

[0015] The deformation of the first sub-bend is gradually restored so that the first sub-bend located below the first bonding portion gradually bonds with the membrane electrode.

[0016] In some embodiments, the method further includes:

[0017] The membrane electrode and the first monopole plate are rotated and bonded together, such that the first sub-bent portion is located above the first bonding portion and the second sub-bent portion is located below the first bonding portion.

[0018] The deformation of the second sub-bend is gradually restored so that the second sub-bend located below the first bonding portion gradually bonds with the membrane electrode.

[0019] In some embodiments, it also includes:

[0020] A second monopolar plate is provided, and an adhesive film is coated on the side of the membrane electrode opposite to the first monopolar plate.

[0021] The second monopolar plate is disposed on the side of the membrane electrode away from the first monopolar plate, and at least one end of the second monopolar plate is bent in the direction away from the membrane electrode, so that the second monopolar plate has a second bonding portion adjacent to the membrane electrode and at least one second bending portion away from the membrane electrode.

[0022] The second bonding portion is bonded to the corresponding part of the membrane electrode, and the membrane electrode is placed at a preset angle with the horizontal plane, with at least one second curved portion of the second monopole plate located below the second bonding portion.

[0023] The deformation of the second curved portion located below the second bonding portion is gradually restored so that the second curved portion located below the second bonding portion gradually adheres to the membrane electrode.

[0024] In some embodiments, the step of bending at least one end of the second monopolar plate in a direction away from the membrane electrode, such that the second monopolar plate has a second bonding portion adjacent to the membrane electrode and at least one second bending portion away from the membrane electrode, includes:

[0025] The two ends of the second monopolar plate are bent in a direction away from the membrane electrode, so that the second monopolar plate has a second bonding portion adjacent to the membrane electrode, a third sub-bending portion away from the membrane electrode, and a fourth sub-bending portion.

[0026] The steps of attaching the second bonding portion to the corresponding part of the membrane electrode and placing the membrane electrode at a predetermined angle to the horizontal plane, with at least one second curved portion of the second monopolar plate located below the second bonding portion, include:

[0027] The second bonding part is bonded to the corresponding part of the membrane electrode, and the membrane electrode is placed at a preset angle with the horizontal plane. The third sub-bending part is located below the second bonding part, and the fourth sub-bending part is located above the second bonding part.

[0028] The step of gradually restoring the deformation of the second curved portion located below the second bonding portion, so that the second curved portion located below the second bonding portion gradually bonds with the membrane electrode, includes:

[0029] The deformation of the third sub-bend is gradually restored so that the third sub-bend located below the second bonding portion gradually bonds with the membrane electrode.

[0030] In some embodiments, the method further includes:

[0031] The membrane electrode and the second monopole are rotated after bonding, such that the third sub-bent portion is located above the second bonding portion and the fourth sub-bent portion is located below the second bonding portion.

[0032] The deformation of the fourth sub-bend is gradually restored so that the fourth sub-bend located below the second bonding portion gradually bonds with the membrane electrode.

[0033] In some embodiments, during the process of gradually restoring the deformation of the first curved portion located below the first bonding portion so that the first curved portion located below the first bonding portion gradually bonds with the membrane electrode, the method further includes: adjusting the angle between the membrane electrode and the horizontal plane so that the angle between the membrane electrode and the horizontal plane gradually increases.

[0034] In some embodiments, the preset included angle is equal to 90°.

[0035] Secondly, this application also provides a fuel cell stack, including multiple individual cells manufactured by the method of the first aspect, wherein the multiple individual cells are stacked.

[0036] Thirdly, this application provides a fuel cell, including the fuel cell stack as described in the second aspect.

[0037] This application involves applying an adhesive film to the side of the membrane electrode facing the first monopolar plate, firstly bringing the first bonding portion of the first monopolar plate into contact with the membrane electrode, and then gradually restoring the deformation of the first curved portion located below the first bonding portion, so that the first curved portion below the first bonding portion gradually comes into contact with the membrane electrode. Since the membrane electrode forms a preset angle with the horizontal plane, and the first curved portion is located below the first bonding portion, the adhesive liquid in the film accumulates downwards under gravity during the bonding process, making the adhesive liquid at the bonding surface thicker than in the horizontal state. When the first curved portion comes into contact with the membrane electrode, the adhesive film can better cover the bonding line, thereby ensuring that no air bubbles are generated during the bonding process, ultimately avoiding the phenomenon of seal failure due to air bubbles at the bonding point between the metal electrode plate and the membrane electrode frame. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying 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 effort.

[0039] Figure 1 This is a schematic flowchart of a single-cell battery preparation method provided in the embodiments of this application;

[0040] Figure 2 This is a schematic diagram of a single-cell battery preparation method provided in the embodiments of this application;

[0041] Figure 3 This is a schematic diagram of a process for bonding the second monopolar plate to the membrane electrode provided in an embodiment of this application;

[0042] Figure 4 This is a schematic diagram of a process for bonding the second monopolar plate to the membrane electrode provided in the embodiments of this application;

[0043] Figure 5 This is another schematic flowchart of the single-cell battery preparation method provided in the embodiments of this application;

[0044] Figure 6 This is a schematic diagram of another process of the single cell preparation method provided in the embodiments of this application;

[0045] Figure 7 This is a schematic diagram of a process for attaching the second sub-bent portion to the membrane electrode, as provided in an embodiment of this application.

[0046] Figure 8This is a schematic diagram of a process in which the second sub-bent portion is attached to the membrane electrode, as provided in an embodiment of this application.

[0047] Figure 9 This is another schematic diagram of the process of bonding the second monopolar plate and the membrane electrode provided in the embodiments of this application;

[0048] Figure 10 This is a schematic diagram of another process for bonding the second monopolar plate to the membrane electrode provided in the embodiments of this application;

[0049] Figure 11 This is a schematic diagram of a process for attaching the four-part curved portion to the membrane electrode provided in an embodiment of this application;

[0050] Figure 12 This is a schematic diagram of a process in which the four curved portions are bonded to the membrane electrode, as provided in an embodiment of this application.

[0051] Among them, 10 is the first monopolar plate, 11 is the first bonding part, 12 is the first bending part, 121 is the first sub-bending part, 122 is the second sub-bending part, 20 is the film electrode, 30 is the adhesive film, 40 is the second monopolar plate, 41 is the second bonding part, 42 is the second bending part, 421 is the third sub-bending part, 422 is the fourth sub-bending part, and 100 is the single cell. Detailed Implementation

[0052] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0054] In this application, the term "exemplary" is used to mean "serving as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use the invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the invention can be made without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the invention with unnecessary detail. Therefore, the invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0055] This application provides a method for preparing a single cell 100, a fuel cell stack, and a fuel cell, which will be described in detail below.

[0056] First, refer to Figure 1 as well as Figure 2 , Figure 1 This paper illustrates a flowchart of a method for preparing a single cell 100 according to an embodiment of this application. Figure 2 This illustration shows a process diagram of a method for preparing a single cell 100 according to an embodiment of this application, wherein the method for preparing the single cell 100 includes:

[0057] Step S101: A first monopolar plate 10 and a membrane electrode 20 are provided, and a film 30 is coated on one side of the membrane electrode 20.

[0058] Specifically, the first monopolar plate 10 can be a cathode plate or an anode plate, made of a conductive material (e.g., metal or graphite). The surface of the first monopolar plate 10 has arranged channels to facilitate conductivity while uniformly distributing the reactant gas (e.g., air or hydrogen) on both sides of the membrane electrode 20. For example, the channels of the first monopolar plate 10 can be straight, serpentine, or meandering.

[0059] The membrane electrode 20 mainly includes a proton exchange membrane, an anode catalyst, a cathode catalyst layer, an anode gas diffusion layer, and a cathode gas diffusion layer. When hydrogen gas introduced into the anode plate reaches the anode catalyst layer through the anode gas diffusion layer, the hydrogen gas undergoes a catalytic reaction to produce hydrogen ions. The hydrogen ions pass through the proton exchange membrane into one side of the cathode plate and react with oxygen on the cathode side to form water, generating electrical energy during the aforementioned redox reaction. Exemplarily, the proton exchange membrane can be a perfluorosulfonic acid membrane, a partially fluorinated polymer proton exchange membrane, a composite proton exchange membrane, or a non-fluorinated polymer proton exchange membrane.

[0060] For example, the adhesive film 30 can be a polyethylene-polyvinyl acetate copolymer, a polyimide hot melt adhesive film 30, or an epoxy adhesive film 30, etc. The adhesive film 30 can be applied to the frame of the membrane electrode 20 on the side facing the first monopolar plate 10.

[0061] Step S102: The first monopolar plate 10 is disposed on the side of the membrane electrode 20 coated with adhesive film, and at least one end of the first monopolar plate 10 is bent in a direction away from the membrane electrode 20, so that the first monopolar plate 10 has a first bonding portion 11 adjacent to the membrane electrode 20 and at least one first bending portion 12 away from the membrane electrode 20.

[0062] Since the first monopolar plate 10 is thin (less than 0.1 mm), at least one end of the first monopolar plate 10 can be bent in a direction away from the membrane electrode 20, so that the first monopolar plate 10 has a first bonding portion 11 adjacent to the membrane electrode 20 and at least one first bending portion 12 away from the membrane electrode 20.

[0063] In some embodiments of this application, the end of the first monopolar plate 10 into which the reactant gas flows can be bent in a direction away from the membrane electrode 20, so that the end of the first monopolar plate 10 into which the reactant gas flows is the first bent portion 12, and the end into which the reactant gas flows is the first bonding portion 11. In some embodiments of this application, the end of the first monopolar plate 10 into which the reactant gas flows can also be bent in a direction away from the membrane electrode 20, so that the end of the first monopolar plate 10 into which the reactant gas flows is the first bent portion 12, and the end into which the reactant gas flows is the first bonding portion 11. In some embodiments of this application, both ends of the first monopolar plate 10 can be bent to form corresponding first bent portions 12, and the middle portion of the first monopolar plate 10 serves as the first bonding portion 11.

[0064] Step S103: The first bonding part 11 is bonded to the corresponding part of the membrane electrode 20, and the membrane electrode 20 is placed at a preset angle α with the horizontal plane. At least one first bending part 12 of the first monopole plate 10 is located below the first bonding part 11. The preset angle α is greater than or equal to 30° and less than or equal to 90°.

[0065] After the first monopolar plate 10 has a first bonding portion 11 adjacent to the membrane electrode 20 and at least one first curved portion 12 away from the membrane electrode 20, the first bonding portion 11 can be bonded to the corresponding part of the membrane electrode 20 to pre-fix the first monopolar plate 10 and the membrane electrode 20. In some embodiments of this application, when the first bonding portion 11 is bonded to the corresponding part of the membrane electrode 20, the membrane electrode 20 can be placed in a horizontal state to facilitate better bonding of the first bonding portion 11. After the first bonding portion 11 is bonded to the corresponding part of the membrane electrode 20, the membrane electrode 20 can be placed at a preset angle α with the horizontal plane, with at least one first curved portion 12 of the first monopolar plate 10 located below the first bonding portion 11, wherein the preset angle α is greater than or equal to 30° and less than or equal to 90°, so that the adhesive of the adhesive film 30 can accumulate at the bonding area during the subsequent bonding process of the first curved portion 12.

[0066] It should be noted that when the membrane electrode 20 is positioned at a preset angle α less than 90° with the horizontal plane (for example, the preset angle α is 60°), the first monopolar plate 10 is located above the membrane electrode 20, thereby adhering to the first curved portion 12 of the first monopolar plate 10 above the membrane electrode 20 to prevent the adhesive film 30 from directly dripping adhesive. In some embodiments of this application, the preset angle α can also be set to 90°, that is, the membrane electrode 20 is in a vertical state.

[0067] Step S104: Gradually restore the deformation of the first curved portion 12 located below the first bonding portion 11, so that the first curved portion 12 located below the first bonding portion 11 gradually adheres to the membrane electrode 20.

[0068] After the first monopolar plate 10 is fixed to the membrane electrode 20 in advance through the first bonding part 11 and the membrane electrode 20 is placed at a preset angle α with the horizontal plane, the deformation of the first curved part 12 located below the first bonding part 11 can be gradually restored, allowing the first curved part 12 to gradually bond with the membrane electrode 20. During the bonding process of the first curved part 12, the adhesive liquid of the adhesive film 30 accumulates downward due to gravity, making the adhesive liquid of the adhesive film 30 at the bonding surface thicker than in the horizontal state. When the first curved part 12 is bonded to the membrane electrode 20, the adhesive film 30 can better cover the bonding line, thereby ensuring that no air bubbles are generated during the bonding process, and ultimately avoiding the phenomenon of sealing failure caused by air bubbles at the bonding point between the metal electrode plate and the frame of the membrane electrode 20.

[0069] In some embodiments of this application, during the process of gradually restoring the deformation of the first curved portion 12 located below the first bonding portion 11 so that the first curved portion 12 located below the first bonding portion 11 gradually bonds with the membrane electrode 20, the method further includes: adjusting the angle between the membrane electrode 20 and the horizontal plane so that the angle between the membrane electrode 20 and the horizontal plane gradually increases. Since the amount of adhesive accumulated in the adhesive film 30 gradually decreases during the bonding process of the first curved portion 12, the tilt angle of the membrane electrode 20 becomes larger and larger during the bonding process. This ensures both the amount of adhesive accumulated in the adhesive film 30 at the bonding location of the first curved portion 12 and the bonding speed between the membrane electrode 20 and the first curved portion 12, preventing the adhesive from solidifying during the bonding process.

[0070] Understandably, this bonding process, in which the membrane electrode 20 is gradually tilted, can also be used for other curved portions, such as the second curved portion 42, the first sub-curved portion 121, the second sub-curved portion 122, the third sub-curved portion 421, and the fourth sub-curved portion 422.

[0071] Furthermore, after attaching the first monopolar plate 10 to the membrane electrode 20, the second monopolar plate 40 can be attached to the membrane electrode 20 in the same manner to form a single-cell battery 100 composed of the first electrode plate, the second electrode plate, and the membrane electrode 20. (See also...) Figure 3 as well as Figure 4 , Figure 3 This illustration shows a schematic diagram of a process for bonding the second monopolar plate 40 and the membrane electrode 20 in an embodiment of this application. Figure 4 This illustration shows a schematic diagram of a process for bonding the second monopolar plate 40 to the membrane electrode 20 in an embodiment of this application. The bonding process includes:

[0072] Step S301: Provide a second monopolar plate 40 and apply an adhesive film 30 to the side of the membrane electrode 20 facing away from the first monopolar plate 10.

[0073] After the first monopolar plate 10 is bonded to the membrane electrode 20, an adhesive film 30 can be applied to the side of the membrane electrode 20 facing away from the first monopolar plate 10 to facilitate the bonding of the second monopolar plate 40. The second monopolar plate 40 can be a cathode plate or an anode plate; for example, when the first monopolar plate 10 is a cathode plate, the second monopolar plate 40 is an anode plate. The second monopolar plate 40 is made of a conductive material (e.g., metal or graphite) and has arranged channels on its surface to facilitate conductivity while uniformly distributing the reactant gas (e.g., air or hydrogen) on both sides of the membrane electrode 20. Exemplarily, the channels of the second monopolar plate 40 can be straight, serpentine, or meandering.

[0074] Step S302: The second monopolar plate 40 is disposed on the side of the membrane electrode 20 away from the first monopolar plate 10, and at least one end of the second monopolar plate 40 is bent in the direction away from the membrane electrode 20, so that the second monopolar plate 40 has a second bonding portion 41 adjacent to the membrane electrode 20 and at least one second bending portion 42 away from the membrane electrode 20.

[0075] In some embodiments of this application, the end of the second monopolar plate 40 into which the reactant gas flows can be bent in a direction away from the membrane electrode 20, so that the end of the second monopolar plate 40 into which the reactant gas flows is the second bent portion 42, and the end into which the reactant gas flows is the second bonding portion 41. In some embodiments of this application, the end of the second monopolar plate 40 into which the reactant gas flows can also be bent in a direction away from the membrane electrode 20, so that the end of the second monopolar plate 40 into which the reactant gas flows is the second bent portion 42, and the end into which the reactant gas flows is the second bonding portion 41. In some embodiments of this application, both ends of the second monopolar plate 40 can be bent to form corresponding second bent portions 42, and the middle portion of the second monopolar plate 40 serves as the second bonding portion 41.

[0076] Step S303: The second bonding part 41 is bonded to the corresponding part of the membrane electrode 20, and the membrane electrode 20 is placed at a preset angle α with the horizontal plane, and at least one second bending part 42 of the second monopole plate 40 is located below the second bonding part 41.

[0077] After the second monopolar plate 40 has a second bonding portion 41 adjacent to the membrane electrode 20 and at least one second curved portion 42 away from the membrane electrode 20, the second bonding portion 41 can be bonded to the corresponding portion of the membrane electrode 20 to pre-fix the second monopolar plate 40 and the membrane electrode 20. In some embodiments of this application, when the second bonding portion 41 is bonded to the corresponding portion of the membrane electrode 20, the membrane electrode 20 can be placed in a horizontal state to facilitate better bonding of the second bonding portion 41. After the second bonding portion 41 is bonded to the corresponding portion of the membrane electrode 20, the membrane electrode 20 can be placed at a predetermined angle α with the horizontal plane, with at least one second curved portion 42 of the second monopolar plate 40 located below the second bonding portion 41, so that the adhesive of the adhesive film 30 can accumulate at the bonding area during the subsequent bonding process of the second curved portion 42.

[0078] It should be noted that when the preset angle α between the membrane electrode 20 and the horizontal plane is less than 90° (for example, the preset angle α is 60°), the second monopolar plate 40 is located above the membrane electrode 20, so that the second curved portion 42 of the second monopolar plate 40 is attached above the membrane electrode 20 to avoid the phenomenon of adhesive film 30 dripping directly onto the adhesive.

[0079] Step S304: Gradually restore the deformation of the second curved portion 42 located below the second bonding portion 41, so that the second curved portion 42 located below the second bonding portion 41 gradually adheres to the membrane electrode 20.

[0080] After the second monopolar plate 40 is fixed to the membrane electrode 20 in advance via the second bonding part 41 and the membrane electrode 20 is placed at a preset angle α with the horizontal plane, the deformation of the second curved part 42 located below the second bonding part 41 can be gradually restored, allowing the second curved part 42 to gradually bond with the membrane electrode 20. During the bonding process, the adhesive film 30 accumulates downward due to gravity, making the adhesive film 30 at the bonding surface thicker than in the horizontal state. When the second curved part 42 bonds with the membrane electrode 20, the adhesive film 30 can better cover the bonding line, thereby ensuring that no air bubbles are generated during the bonding process of the second monopolar plate 40.

[0081] In some embodiments of this application, such as an embodiment in which both ends of the first monopolar plate 10 are simultaneously bent to form corresponding first bent portions 12, see [reference needed]. Figure 5 as well as Figure 6 , Figure 5 This paper illustrates another flowchart of the method for preparing a single cell 100 in an embodiment of this application. Figure 6 This illustration shows another process diagram of the method for preparing a single cell 100 according to an embodiment of this application, wherein the method for preparing a single cell 100 includes:

[0082] Step S501: A first monopolar plate 10 and a membrane electrode 20 are provided, and an adhesive film 30 is applied to the side of the membrane electrode 20 facing the first monopolar plate 10.

[0083] Step S502: The two ends of the first monopolar plate 10 are bent in the direction away from the membrane electrode 20, so that the first monopolar plate 10 has a first bonding portion 11 adjacent to the membrane electrode 20, a first sub-bending portion 121 away from the membrane electrode 20, and a second sub-bending portion 122.

[0084] Step S503: The first bonding part 11 is bonded to the corresponding part of the membrane electrode 20, and the membrane electrode 20 is placed at a preset angle α with the horizontal plane. The first sub-bending part 121 is located below the first bonding part 11, and the second sub-bending part 122 is located above the first bonding part 11. The preset angle α is greater than or equal to 30° and less than or equal to 90°.

[0085] Step S504: Gradually restore the deformation of the first sub-bent portion 121 so that the first sub-bent portion 121 located below the first bonding portion 11 gradually bonds with the membrane electrode 20.

[0086] It should be noted that, since the two ends of the first monopolar plate 10 are bent first and corresponding to the first sub-bent portion 121 and the second sub-bent portion 122 respectively, when fixing the first monopolar plate 10 to the membrane electrode 20, the first bonding portion 11 in the middle can be bonded to the corresponding position of the membrane electrode 20 first, and then the first monopolar plate 10 and the membrane electrode 20 can be bonded from the first sub-bent portions 121 and the second sub-bent portions 122 at both ends. Since the amount of adhesive applied to the adhesive film 30 will leave a margin after the first monopolar plate 10 and the membrane electrode 20 are fully bonded, if one end of the first monopolar plate 10 is bonded first and the other end is gradually bonded, the first bonding portion 11 of the first monopolar plate 10 will need to have a lot of adhesive. If there is too much residual adhesive, it will block the flow channel or intake manifold and other structures. Therefore, bonding the first monopolar plate 10 and the membrane electrode 20 in two steps can ensure that the amount of residual adhesive is controllable and avoid the phenomenon of adhesive blocking the gas flow channel or intake manifold.

[0087] Furthermore, the second sub-bent portion 122 can also be fitted using the same method as the first sub-bent portion 121, see reference. Figure 7 as well as Figure 8 , Figure 7 This illustration shows a process diagram of the second sub-bent portion 122 being attached to the membrane electrode 20 in an embodiment of this application. Figure 8 This illustration shows a process of bonding the second sub-bent portion 122 to the membrane electrode 20 in an embodiment of this application. The bonding process of the second sub-bent portion 122 to the membrane electrode 20 includes:

[0088] Step S701: Rotate the partially bonded membrane electrode 20 and the first monopolar plate 10 so that the bonded first sub-bent portion 121 is located above the first bonding portion 11 and the second sub-bent portion 122 is located below the first bonding portion 11.

[0089] Step S702: Gradually restore the deformation of the second sub-bent portion 122 so that the second sub-bent portion 122 located below the first bonding portion 11 gradually bonds with the membrane electrode 20.

[0090] It should be noted that after the membrane electrode 20 and the first monopolar plate 10 are joined by the rotating part, the membrane electrode 20 still forms a preset angle α with the horizontal plane. However, at this time, the first sub-bent portion 121 is located above the first joining portion 11, and the second sub-bent portion 122 is located below the first joining portion 11. During the joining process of the second sub-bent portion 122, the adhesive liquid of the adhesive film 30 can accumulate at the joining point, thereby avoiding the phenomenon of air bubbles being generated in the second sub-bent portion 122 during the joining process.

[0091] In some embodiments of this application, for example, regarding the bonding process of the second monopolar plate 40, both ends of the second monopolar plate 40 may be bent and bonded in a direction away from the membrane electrode 20. See also... Figure 9 as well as Figure 10 , Figure 9 This illustration shows another schematic diagram of the process for attaching the second monopolar plate 40 to the membrane electrode 20 in an embodiment of this application. Figure 10 This illustration shows another process for bonding the second monopolar plate 40 to the membrane electrode 20 in an embodiment of this application. The bonding process includes:

[0092] Step S901: Provide a second monopolar plate 40 and apply an adhesive film 30 to the side of the membrane electrode 20 opposite to the first monopolar plate 10.

[0093] Step S902: The two ends of the second monopolar plate 40 are bent in the direction away from the membrane electrode 20, so that the second monopolar plate 40 has a second bonding portion 41 adjacent to the membrane electrode 20, a third sub-bending portion 421 away from the membrane electrode 20, and a fourth sub-bending portion 422.

[0094] Step S903: The second bonding part 41 is bonded to the corresponding part of the membrane electrode 20, and the membrane electrode 20 is placed at a preset angle α with the horizontal plane. The third sub-bending part 421 is located below the second bonding part 41, and the fourth sub-bending part 422 is located above the second bonding part 41.

[0095] Step S904: Gradually restore the deformation of the third sub-bent bending portion 421 so that the third sub-bent bending portion 421 located below the second bonding portion 41 gradually bonds with the membrane electrode 20.

[0096] Similarly, since the two ends of the second monopolar plate 40 are bent first and correspond to the third sub-bent portion 421 and the fourth sub-bent portion 422 respectively, when fixing the second monopolar plate 40 to the membrane electrode 20, the second bonding portion 41 in the middle can be bonded to the corresponding position of the membrane electrode 20 first, and then the second monopolar plate 40 and the membrane electrode 20 can be bonded from both ends respectively. Since the amount of adhesive applied to the adhesive film 30 will leave a margin after the second monopolar plate 40 and the membrane electrode 20 are fully bonded, if one end of the first monopolar plate 10 is bonded first and the other end is gradually bonded, the second bonding portion 41 of the second monopolar plate 40 will need to have more adhesive. If there is too much residual adhesive, it will block the flow channel or intake manifold and other structures. Therefore, bonding the second monopolar plate 40 and the membrane electrode 20 in two stages can ensure that the amount of residual adhesive is controllable and avoid the phenomenon of blocking the gas flow channel or intake manifold.

[0097] Furthermore, the fourth sub-bend 422 can also be bonded using the same method as the third sub-bend 421, see reference. Figure 11 as well as Figure 12 , Figure 11 This illustration shows a process diagram of the fourth sub-bent portion 422 being attached to the membrane electrode 20 in an embodiment of this application. Figure 12This illustration shows a process of bonding the fourth sub-bent portion 422 to the membrane electrode 20 in an embodiment of this application. The bonding process of the fourth sub-bent portion 422 to the membrane electrode 20 includes:

[0098] In step S1101, rotate the partially bonded membrane electrode 20 and the second monopole plate 40 so that the bonded third sub-bent portion 421 is located above the second bonded portion 41 and the fourth sub-bent portion 422 is located below the second bonded portion 41.

[0099] Step S1102: Gradually restore the deformation of the fourth sub-bent portion 422 so that the fourth sub-bent portion 422 located below the second bonding portion 41 gradually bonds with the membrane electrode 20.

[0100] Similarly, after the membrane electrode 20 and the second monopolar plate 40 are rotated and bonded, the membrane electrode 20 still forms a preset angle α with the horizontal plane. However, at this time, the bonded third sub-bend 421 is located above the second bonding portion 41, and the fourth sub-bend 422 is located below the second bonding portion 41. During the bonding process of the fourth sub-bend 422, the adhesive liquid of the adhesive film 30 can accumulate at the bonding area, thereby avoiding the phenomenon of air bubbles being generated in the fourth sub-bend 422 during the bonding process.

[0101] It is worth noting that the above-mentioned method for preparing a single cell 100 is intended to clearly illustrate the implementation and verification process of this application. Those skilled in the art can also make equivalent modifications under the guidance of this application. For example, when bending from both sides of the first monopolar plate 10 to generate a first sub-bent portion 121 and a second sub-bent portion 122, during the bonding process of the bent portion 12 of the first monopolar plate 10, the first sub-bent portion 121 and the second sub-bent portion 122 are bonded to the membrane electrode 20 from both sides respectively.

[0102] Furthermore, to better implement the cell preparation method 100 in the embodiments of this application, based on the cell preparation method 100, this application also provides a fuel cell stack, including multiple cell 100s manufactured by the method of any of the above embodiments, with the multiple cell 100s stacked together. Since the fuel cell stack in the embodiments of this application includes the cell 100s manufactured in the above embodiments, it possesses all the beneficial effects of the cell 100s in the above embodiments, which will not be repeated here.

[0103] Furthermore, to better implement the fuel cell stack in the embodiments of this application, based on the fuel cell stack, this application also provides a fuel cell including the fuel cell stack manufactured as described in the above embodiments. Since the fuel cell stack in the embodiments of this application includes the single cell 100 manufactured in the above embodiments, it possesses all the beneficial effects of the single cell 100 in the above embodiments, which will not be repeated here.

[0104] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the detailed descriptions of other embodiments above, which will not be repeated here.

[0105] The basic concepts have been described above. Obviously, for those skilled in the art, the detailed disclosure above is merely illustrative and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application, and therefore remain within the spirit and scope of the exemplary embodiments of this application.

[0106] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0107] Similarly, it should be noted that, in order to simplify the description of the present application and thus aid in the understanding of one or more embodiments of the invention, the foregoing description of the embodiments of the present application sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of the application requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of the single embodiments disclosed above.

[0108] In some embodiments, numbers describing the quantity of components and attributes are used. It should be understood that such numbers used in the description of embodiments are modified in some examples with the terms "approximately," "approximately," or "generally." Unless otherwise stated, "approximately," "approximately," or "generally" indicates that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may be changed depending on the characteristics required by individual embodiments. In some embodiments, numerical parameters should take into account specified significant digits and employ a general method of digit reservation. Although the numerical ranges and parameters used to confirm their breadth of scope in some embodiments of this application are approximate values, in specific embodiments, such values ​​are set as precisely as feasible.

[0109] For each patent, patent application, patent application publication, and other material such as articles, books, specifications, publications, and documents referenced in this application, the entire contents of that patent application are incorporated herein by reference, except for historical application documents that are inconsistent with or conflict with the content of this application, and documents that limit the broadest scope of the claims of this application (currently or subsequently appended to this application). It should be noted that if there are any inconsistencies or conflicts between the descriptions, definitions, and / or terminology used in the supplementary materials of this application and the content of this application, the descriptions, definitions, and / or terminology used in this application shall prevail.

[0110] The foregoing has provided a detailed description of a single-cell battery preparation method, a fuel cell stack, and a fuel cell provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for preparing a single-cell battery, characterized in that, include: A first monopolar plate and a membrane electrode are provided, wherein one side of the membrane electrode is coated with an adhesive film; The first monopolar plate is disposed on the side of the membrane electrode coated with adhesive film, and at least one end of the first monopolar plate is bent in a direction away from the membrane electrode, so that the first monopolar plate has a first bonding portion adjacent to the membrane electrode and at least one first bending portion away from the membrane electrode. The first bonding portion is bonded to the corresponding part of the membrane electrode, and the membrane electrode is placed at a preset angle with the horizontal plane. At least one first curved portion of the first monoplate is located below the first bonding portion. The preset angle is greater than or equal to 30° and less than or equal to 90°, so that the adhesive liquid of the adhesive film is deposited downward under the action of gravity. The deformation of the first curved portion located below the first bonding portion is gradually restored so that the first curved portion located below the first bonding portion gradually adheres to the membrane electrode.

2. The method for preparing a single-cell battery as described in claim 1, characterized in that, The step of bending at least one end of the first monopolar plate in a direction away from the membrane electrode, such that the first monopolar plate has a first contact portion adjacent to the membrane electrode and a first bent portion away from the membrane electrode, includes: The first monopolar plate is bent at both ends in a direction away from the membrane electrode, so that the first monopolar plate has a first bonding portion adjacent to the membrane electrode, a first sub-bending portion away from the membrane electrode, and a second sub-bending portion. The step of attaching the first bonding portion to the corresponding part of the membrane electrode and placing the membrane electrode at a predetermined angle to the horizontal plane, wherein at least one first curved portion of the first monopolar plate is located below the first bonding portion, includes: The first bonding portion is bonded to the corresponding part of the membrane electrode, and the membrane electrode is placed at a preset angle with the horizontal plane. The first sub-bent portion is located below the first bonding portion, and the second sub-bent portion is located above the first bonding portion. The preset angle is greater than or equal to 30° and less than or equal to 90°. The step of gradually restoring the deformation of the first curved portion located below the first bonding portion, so that the first curved portion located below the first bonding portion gradually adheres to the membrane electrode, includes: The deformation of the first sub-bend is gradually restored so that the first sub-bend located below the first bonding portion gradually bonds with the membrane electrode.

3. The method for preparing a single-cell battery as described in claim 2, characterized in that, The method further includes: The membrane electrode and the first monopolar plate are rotated and bonded together such that the first sub-bent portion is located above the first bonding portion and the second sub-bent portion is located below the first bonding portion. The deformation of the second sub-bend is gradually restored so that the second sub-bend located below the first bonding portion gradually bonds with the membrane electrode.

4. The method for preparing a single-cell battery as described in claim 1, characterized in that, Also includes: A second monopolar plate is provided, and an adhesive film is coated on the side of the membrane electrode opposite to the first monopolar plate; The second monopolar plate is disposed on the side of the membrane electrode away from the first monopolar plate, and at least one end of the second monopolar plate is bent in a direction away from the membrane electrode, so that the second monopolar plate has a second bonding portion adjacent to the membrane electrode and at least one second bending portion away from the membrane electrode. The second bonding portion is bonded to the corresponding part of the membrane electrode, and the membrane electrode is placed at the preset angle with the horizontal plane, with at least one second curved portion of the second monopole plate located below the second bonding portion; The deformation of the second curved portion located below the second bonding portion is gradually restored so that the second curved portion located below the second bonding portion gradually adheres to the membrane electrode.

5. The method for preparing a single-cell battery as described in claim 4, characterized in that, The step of bending at least one end of the second monopolar plate in a direction away from the membrane electrode, such that the second monopolar plate has a second contact portion adjacent to the membrane electrode and at least one second bending portion away from the membrane electrode, includes: The two ends of the second monopolar plate are bent in a direction away from the membrane electrode, so that the second monopolar plate has a second bonding portion adjacent to the membrane electrode, a third sub-bending portion away from the membrane electrode, and a fourth sub-bending portion. The step of attaching the second bonding portion to the corresponding part of the membrane electrode and placing the membrane electrode at the preset angle with the horizontal plane, wherein at least one second curved portion of the second monopolar plate is located below the second bonding portion, includes: The second bonding portion is bonded to the corresponding part of the membrane electrode, and the membrane electrode is placed at the preset angle with the horizontal plane. The third sub-bending portion is located below the second bonding portion, and the fourth sub-bending portion is located above the second bonding portion. The step of gradually restoring the deformation of the second curved portion located below the second bonding portion, so that the second curved portion located below the second bonding portion gradually adheres to the membrane electrode, includes: The deformation of the third sub-bend is gradually restored so that the third sub-bend located below the second bonding portion gradually bonds with the membrane electrode.

6. The method for preparing a single-cell battery as described in claim 5, characterized in that, The method further includes: The membrane electrode and the second monopolar plate are rotated and bonded together such that the bonded third sub-bent portion is located above the second bonded portion and the fourth sub-bent portion is located below the second bonded portion; The deformation of the fourth sub-bend is gradually restored so that the fourth sub-bend located below the second bonding portion gradually bonds with the membrane electrode.

7. The method for preparing a single-cell battery as described in claim 1, characterized in that, In the process of gradually restoring the deformation of the first curved portion located below the first bonding portion so that the first curved portion located below the first bonding portion gradually bonds with the membrane electrode, the method further includes: adjusting the angle between the membrane electrode and the horizontal plane so that the angle between the membrane electrode and the horizontal plane gradually increases.

8. The method for preparing a single-cell battery as described in claim 1, characterized in that, The preset included angle is equal to 90°.

9. A fuel cell stack, characterized in that, It includes a plurality of individual cells manufactured by the method as described in any one of claims 1 to 8, wherein the plurality of individual cells are stacked.

10. A fuel cell, characterized in that, Includes the fuel cell stack as described in claim 9.

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