Cell monomer, manufacturing method thereof and fuel cell

Abstract

The invention relates to a battery monomer, a manufacturing method thereof and a fuel cell, and relates to the technical field of fuel cells. The battery monomer comprises two polar plates which are oppositely arranged along a first direction, a bonding layer clamped between the two polar plates and a membrane electrode assembly clamped between the two polar plates; the bonding layer comprises a first bonding part arranged opposite to the edge part of the first gas diffusion layer, the first bonding part is connected with the edge part of the first gas diffusion layer and defines a first clamping space, and the edge part of the proton exchange layer is clamped in the first clamping space. Therefore, the attachment between the proton exchange layer and the first gas diffusion layer is reinforced, the attachment between the proton exchange layer and the bonding part is reinforced, the risk of deformation of the proton exchange layer in the operation process of the battery monomer is reduced, and the air tightness of the battery monomer is improved.

Description

Technical Field

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

[0002] During the long-term operation of battery cells, the sealing structure fails and the sealing material ages, which leads to a decrease in sealing performance, thus causing the performance of the battery cells to decline and reducing the overall efficiency output. Therefore, how to improve the sealing performance of battery cells is an issue worthy of attention. Summary of the invention

[0003] Based on this, the present application provides a battery cell and a manufacturing method thereof, and a fuel cell to improve the sealing performance of the battery cell.

[0004] In a first aspect, an embodiment of the present application provides a battery cell, including:

[0005] Two pole plates are arranged opposite to each other along a first direction;

[0006] An adhesive layer is sandwiched between the two electrode plates and defines a packaging cavity with the two electrode plates; and

[0007] The membrane electrode assembly is sandwiched between the two electrode plates and is located in the packaging cavity; the membrane electrode assembly includes a first gas diffusion layer, a proton exchange layer and a second gas diffusion layer stacked along a first direction;

[0008] The bonding layer includes a first bonding portion arranged opposite to the edge portion of the first gas diffusion layer, the first bonding portion is connected to the edge portion of the first gas diffusion layer and defines a first clamping space, and the edge portion of the proton exchange layer is clamped in the first clamping space.

[0009] In one embodiment, the edge portion of the first gas diffusion layer includes a first portion, a second portion, and a third portion connected to the first portion and the second portion;

[0010] The first portion is connected to the first bonding portion, the second portion is connected to the proton exchange layer, and a first interval is defined between the third portion and the first bonding portion.

[0011] In one embodiment, along the first direction, the size of the first portion, the size of the second portion and the size of the third portion are the same; and / or

[0012] The compression ratio of the first part, the compression ratio of the second part and the compression ratio of the third part are the same; and / or

[0013] The compression rate of the edge portion of the first gas diffusion layer is 15% to 35%.

[0014] In one embodiment, the orthographic projections of the first bonding portion and the edge portion of the first gas diffusion layer on a reference plane have a first overlapping projection; the reference plane is a plane perpendicular to the first direction; the first overlapping projection has a first inner contour disposed near the center of the battery cell, and a first outer contour disposed at intervals from the first inner contour; the spacing between the first inner contour and the first outer contour is 0.3 mm to 30 mm; and / or

[0015] The orthographic projection of the edge portion of the first bonding portion and the proton exchange layer on the reference plane has a second overlapping projection; the reference plane is a plane perpendicular to the first direction; the second overlapping projection has a second inner contour arranged close to the center of the battery cell, and a second outer contour arranged at intervals from the second inner contour; the spacing between the second inner contour and the second outer contour is 1.5 mm to 30 mm.

[0016] In one embodiment, the edge portion of the proton exchange layer and the edge portion of the second gas diffusion layer define a second clamping space;

[0017] At least a portion of the first bonding portion is clamped in the second clamping space.

[0018] In one embodiment, the edge portion of the second gas diffusion layer includes a fourth portion, a fifth portion, and a sixth portion connected to the fourth portion and the fifth portion; the fourth portion is connected to the first bonding portion, the fifth portion is connected to the proton exchange layer, and a second interval is defined between the sixth portion and the first bonding portion; and / or

[0019] The orthographic projections of the first bonding portion and the edge portion of the second gas diffusion layer on the reference plane have a third overlapping projection; the reference plane is a plane perpendicular to the first direction; the third overlapping projection has a third inner contour disposed near the center of the battery cell, and a third outer contour disposed at intervals from the third inner contour; the spacing between the third inner contour and the third outer contour is 1.5 mm to 30 mm; and / or

[0020] The orthographic projections of the second gas diffusion layer and the proton exchange layer on a reference plane overlap with each other, and the reference plane is a plane perpendicular to the first direction.

[0021] In one embodiment, an inner contour of an orthographic projection of the bonding layer on a reference surface overlaps with an outer contour of an orthographic projection of the second gas diffusion layer on the reference surface; the reference surface is a plane perpendicular to the first direction.

[0022] In one embodiment, the material of the adhesive layer includes ethylene-vinyl acetate copolymer film; and / or

[0023] The elastic modulus of the bonding layer is 10 MPa to 500 MPa; and / or

[0024] A size of the adhesive layer along the first direction is 20 μm to 300 μm.

[0025] In a second aspect, an embodiment of the present application provides a method for manufacturing a battery cell, comprising:

[0026] Rolling and aligning the bonding layer and the proton exchange layer to form a first pressed body;

[0027] The first gas diffusion layer, the second gas diffusion layer, the two electrode plates and the first pressed body are pressed together by a flat pressing alignment process to form a second pressed body; wherein the bonding layer is sandwiched between the two electrode plates and defines a packaging cavity with the two electrode plates; the first gas diffusion layer, the proton exchange layer and the second gas diffusion layer are stacked and located in the packaging cavity; the bonding layer includes a first bonding portion arranged opposite to an edge portion of the first gas diffusion layer; an edge portion of the first gas diffusion layer in the second target layer is connected to the first bonding portion and defines a first clamping space; an edge portion of the proton exchange layer is clamped in the first clamping space;

[0028] The second pressed body is laminated by a flat pressing process to form a battery cell.

[0029] In one embodiment, the second pressed body is laminated by a flat pressing process to form a battery cell, including:

[0030] Performing a flat pressing pre-lamination process on the second pressed body to form a third pressed body;

[0031] The third pressed body is subjected to a flat pressing and laminating process to form a battery cell.

[0032] In one embodiment, during the flat pressing pre-lamination process, a first pressure is applied to the second lamination body for a first time at a first preset temperature and a first vacuum degree; wherein the first preset temperature is 50° C. to 70° C., the first vacuum degree is 0.08 MPa to 0.12 MPa, the first pressure is 0.3 MPa to 1.5 MPa, and the first time is 5 s to 30 s; and / or

[0033] During the flat pressing and laminating process, at the second preset temperature, a second pressure is applied to the third pressing body for a second time period; wherein the second preset temperature is 90°C to 120°C, the second pressure is 0.5MPa to 1.5MPa, and the second time period is 10s to 90s.

[0034] In one embodiment, the first gas diffusion layer, the second gas diffusion layer, the two plates and the first pressed body are pressed together by a flat pressing alignment process to form a second pressed body, including:

[0035] At a third preset temperature, the first gas diffusion layer and the first pressed body are processed by a flat pressing and alignment process; one of the two electrode plates and the first pressed body are processed by a flat pressing and alignment process; the second gas diffusion layer and the side of the proton exchange layer facing away from the first gas diffusion layer are processed by a flat pressing and alignment process, and the other electrode plate of the two electrode plates and the bonding layer are flat pressed and aligned to form a second pressed body, so as to form a second pressed body, wherein the third preset temperature is 50°C to 70°C.

[0036] In a third aspect, an embodiment of the present application provides a fuel cell, comprising a battery cell in any of the above embodiments; and / or, comprising a battery cell manufactured by the method for manufacturing a battery cell in any of the above embodiments.

[0037] In the above-mentioned battery cell and its manufacturing method, and fuel cell, the battery cell includes two pole plates arranged opposite to each other along a first direction, an adhesive layer sandwiched between the two pole plates, and a membrane electrode assembly sandwiched between the two pole plates. The adhesive layer and the two pole plates define a packaging cavity, the membrane electrode assembly is located in the packaging cavity, and the membrane electrode assembly includes a first gas diffusion layer, a proton exchange layer, and a second gas diffusion layer stacked along the first direction. Among them, the adhesive layer includes a first adhesive portion arranged opposite to the edge portion of the first gas diffusion layer, the first adhesive portion is connected to the edge portion of the first gas diffusion layer and defines a first clamping space, and the edge portion of the proton exchange layer is clamped in the first clamping space. In this way, the fit between the proton exchange layer and the first gas diffusion layer is strengthened, and the fit between the proton exchange layer and the adhesive portion is strengthened, the risk of deformation of the proton exchange layer during the operation of the battery cell is reduced, and the air tightness and air tightness durability of the battery cell are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic top view of a battery cell provided in some embodiments of the present application.

[0039] Figure 2 for Figure 1 Schematic diagram of the cross section of the battery cell at point aa.

[0040] Figure 3 for Figure 2 Schematic diagram of the first overlapping projection, the second overlapping projection and the third overlapping projection of the cross section on the reference plane.

[0041] Figure 4 A schematic top view of a battery cell provided in some further embodiments of the present application.

[0042] Figure 5 for Figure 4 Schematic diagram of the cross section of the battery cell at bb.

[0043] Figure 6This is a flow chart of an embodiment of a battery cell manufacturing method provided in the present application.

[0044] Figure 7 for Figure 6 A flowchart of other steps of the battery cell manufacturing method.

[0045] Figure 8 for Figure 6 A flowchart of other steps of the battery cell manufacturing method.

[0046] The reference numerals in the specific implementation manner are as follows:

[0047] 100. Battery cell, 1. Plate, 11. Anode plate, 12. Cathode plate, 2. Adhesive layer, 21. First adhesive portion, A. Packaging cavity, 3. First gas diffusion layer, 31. First portion, 32. Second portion, 33. Third portion, J1. First spacer, 4. Second gas diffusion layer, 41. Fourth portion, 42. Fifth portion, 43. Sixth portion, J2. Second spacer, 5. Proton exchange layer, B. First clamping space, C. Second clamping space,

[0048] S, reference plane, T1, first overlapping projection, N1, first inner contour, W1, first outer contour, T2, second overlapping projection, N2, second inner contour, W2, second outer contour, T3, third overlapping projection, N3, third inner contour, N3, third outer contour, F1, first direction. DETAILED DESCRIPTION

[0049] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0050] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply 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 a limitation on the present application.

[0051] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0052] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0053] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0054] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If present, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0055] See also Figure 1 and Figure 2 , Figure 1 A schematic top view of a battery cell 100 provided in some embodiments of the present application is shown in FIG. Figure 2 for Figure 1Schematic cross-sectional view of a battery cell 100 at aa in FIG. The battery cell 100 includes two electrode plates 1 arranged opposite to each other along a first direction F1, a bonding layer 2 sandwiched between the two electrode plates 1, and a membrane electrode assembly sandwiched between the two electrode plates 1. The bonding layer 2 and the two electrode plates 1 define a packaging cavity A, the membrane electrode assembly is located in the packaging cavity A, and the membrane electrode assembly includes a first gas diffusion layer 3, a proton exchange layer 5, and a second gas diffusion layer 4 stacked along the first direction F1.

[0056] The two electrode plates 1 are a cathode plate 11 and an anode plate 12 , and one of the first gas diffusion layer 3 and the second gas diffusion layer 4 is a cathode gas diffusion layer, and the other is an anode gas diffusion layer.

[0057] It can be understood that the working principle of the battery cell 100 includes: the cathode plate 11 is connected to the cathode gas diffusion layer, and the anode plate 12 is connected to the anode gas diffusion layer. Hydrogen enters the membrane electrode assembly from the anode gas diffusion layer, and under the action of the catalyst, the hydrogen molecules are decomposed into protons and electrons in the anode gas diffusion layer. Then, the protons move from the anode gas diffusion layer to the cathode gas diffusion layer through the proton exchange layer 5, and the electrons flow from the anode gas diffusion layer to the cathode gas diffusion layer through the external circuit to form an electric current. Oxygen enters the membrane electrode assembly through the cathode gas diffusion layer, and the oxygen combines with the electrons and the protons that reach the cathode gas diffusion layer through the proton exchange layer 5 to form water.

[0058] Among them, the bonding layer 2 includes a first bonding portion 21 arranged opposite to the edge portion of the first gas diffusion layer 3, the first bonding portion 21 is connected to the edge portion of the first gas diffusion layer 3 and defines a first clamping space B, and the edge portion of the proton exchange layer 5 is clamped in the first clamping space B.

[0059] In this way, the adhesion between the proton exchange layer 5 and the first gas diffusion layer 3 and the adhesion between the proton exchange layer 5 and the adhesive portion are strengthened, thereby reducing the risk of deformation of the proton exchange layer 5 during operation of the battery cell 100 .

[0060] It is understandable that in the related art, during the operation of the battery cell 100, the bonding layer 2 is connected to the proton exchange layer 5 and the plate 1. Since the rigidity of the proton exchange layer 5 is smaller than that of the plate 1, the proton exchange layer 5 will be more easily deformed, and the contact surface between the deformed proton exchange layer 5 and the bonding layer 2 will become uneven, which will cause the contact area between the bonding layer 2 and the deformed proton exchange layer 5 to be smaller, so that the force exerted by the proton exchange layer 5 on the bonding layer 2 will be greater, resulting in only a part of the bonding layer 2 being stressed, rather than being evenly distributed. This uneven stress state can easily cause the bonding layer 2 structure to deform, thereby affecting the connection stability between the bonding layer 2 and the plate 1. If the connection is unstable, the airtightness of the battery cell 100 will be affected, affecting the performance and life of the battery.

[0061] However, the present application strengthens the adhesion between the proton exchange layer 5 and the first gas diffusion layer 3 , and strengthens the adhesion between the proton exchange layer 5 and the adhesive portion, thereby suppressing the deformation of the proton exchange layer 5 and further improving the airtightness of the battery cell 100 .

[0062] In some embodiments of the present application, reference may be made to Figure 1 and Figure 2 The edge portion of the first gas diffusion layer 3 includes a first portion 31, a second portion 32, and a third portion 33 connected to the first portion 31 and the second portion 32. The first portion 31 is connected to the first bonding portion 21, the second portion 32 is connected to the proton exchange layer 5, and a first interval J1 is defined between the third portion 33 and the first bonding portion 21.

[0063] In this way, by connecting the edge portions of the first gas diffusion layer 3 to the first bonding portion 21 and the proton exchange layer 5, respectively, the proton exchange layer 5 is clamped between the first gas diffusion layer 3 and the first bonding portion 21, which makes it easier for the proton exchange layer 5 to be clamped between the first gas diffusion layer 3 and the first bonding portion 21, giving the proton exchange layer 5 a greater clamping force, making it less likely for the proton exchange layer 5 to deform during the use of the battery cell 100, and also making it simple to produce and easy to mass produce.

[0064] In some other embodiments, the bonding layer 2 can be designed to be of a special shape, so that the proton exchange layer 5, the first gas diffusion layer 3 and the bonding layer 2 are fitted together without gaps, which can further improve the sealing performance. However, compared with the above embodiments provided in this application, the processing cost is higher and it is not convenient for mass production.

[0065] In some embodiments of the present application, reference may be made to Figure 1 and Figure 2 , along the first direction F1, the size of the first part 31, the size of the second part 32 and the size of the third part 33 are the same; and / or, the compression rate of the first part 31, the compression rate of the second part 32 and the compression rate of the third part 33 are the same; and / or, the compression rate of the edge part of the first gas diffusion layer 3 is 15% to 35%. The compression rate is the ratio of the original thickness to the thickness after compression. Specifically, in the present application, the thickness of the first part 31, the second part 32 and the third part 33 are the same, and the material of the first part 31, the second part 32 and the third part 33 is the same. After the first gas diffusion layer 3 is compressed, the compression amounts of the various parts of the first gas diffusion layer, that is, the first part 31, the second part 32 and the third part 33 are also the same.

[0066] In some embodiments, including but not limited to the following:

[0067] When "along the first direction F1, the size of the first part 31, the size of the second part 32 and the size of the third part 33 are the same", it is not only easier to produce and process the gas diffusion layer, but also makes the gas diffusion layer evenly distributed in the entire battery cell 100, thereby making the gas evenly distributed in the battery cell 100.

[0068] In the case where "the compression rate of the first part 31, the compression rate of the second part 32 and the compression rate of the third part 33 are the same", the power generation performance of the battery cell 100 can be further improved. It is understandable that if the compression rate of the gas diffusion layer is different, the transmission resistance of the gas in the battery cell 100 will increase, thereby reducing the ability to discharge water, so that the power generation performance of the battery cell 100 is affected. The setting of the same compression rate of the first part 31, the second part 32 and the third part 33 of the first gas diffusion layer 3 is achieved by the flow channel design of the electrode 1 in contact with the first gas diffusion layer 3.

[0069] When the compression rate of the edge of the first gas diffusion layer 3 is 15% to 35%, the power generation performance of the battery cell 100 can be further improved. If the compression rate is too small, the contact resistance between the gas diffusion layer and the proton exchange layer 5 will increase, thereby affecting the power generation performance of the battery cell 100. If the compression rate is too large, the gas transmission rate in the battery cell 100 will be affected, thereby affecting the water discharge capacity, and further affecting the power generation performance of the battery cell 100. It is understood that the compression rate can be 15%, 20%, 30%, 35%, etc.

[0070] The above-mentioned “along the first direction F1, the size of the first part 31, the size of the second part 32 and the size of the third part 33 are the same”, “the compression rate of the first part 31, the compression rate of the second part 32 and the compression rate of the third part 33 are the same” and “the compression rate of the edge part of the first gas diffusion layer 3 is 15% to 35%” can be arbitrarily combined and set according to actual conditions.

[0071] In some embodiments of the present application, reference may be made to Figure 1 and Figure 2 , and combined with reference Figure 3 , Figure 3 for Figure 2Schematic diagram of the first overlapping projection T1, the second overlapping projection T2 and the third overlapping projection T3 of the cross section in the reference plane S. The orthographic projection of the edge portion of the first bonding portion 21 and the first gas diffusion layer 3 on the reference plane S has a first overlapping projection T1, the reference plane S is a plane perpendicular to the first direction F1, the first overlapping projection T1 has a first inner contour N1 arranged near the center of the battery cell 100, and a first outer contour W1 arranged at intervals from the first inner contour N1, and the spacing between the first inner contour N1 and the first outer contour W1 is 0.3 mm to 30 mm; and / or, the orthographic projection of the first bonding portion 21 and the edge portion of the proton exchange layer 5 on the reference plane S has a second overlapping projection T2, the reference plane S is a plane perpendicular to the first direction F1, the second overlapping projection T2 has a second inner contour N2 arranged near the center of the battery cell 100, and a second outer contour W2 arranged at intervals from the second inner contour N2, and the spacing between the second inner contour N2 and the second outer contour W2 is 1.5 mm to 30 mm.

[0072] In some embodiments, including but not limited to the following:

[0073] In the case where "the orthographic projections of the edge of the first bonding portion 21 and the first gas diffusion layer 3 on the reference plane S have a first overlapping projection T1, the reference plane S is a plane perpendicular to the first direction F1, the first overlapping projection T1 has a first inner contour N1 disposed close to the center of the battery cell 100, and a first outer contour W1 disposed at intervals from the first inner contour N1, and the spacing between the first inner contour N1 and the first outer contour W1 is 0.3 mm to 30 mm", the battery cell 100 can have both good sealing and good power generation performance. If the spacing is too small, the bonding force and durability between the first bonding portion 21 and the first gas diffusion layer 3 are affected, thereby affecting the sealing performance of the battery cell 100. If the spacing is too large, the contact area between the first gas diffusion layer 3 and the first bonding portion 21 is reduced, thereby affecting gas transmission, and affecting the power generation performance of the battery cell 100. It can be understood that the spacing between the first inner contour N1 and the first outer contour W1 can be 0.3 mm, 1 mm, 5 mm, 10 mm, 20 mm, 25 mm, 30 mm, etc.

[0074] In the case where "the orthographic projections of the edge of the first bonding portion 21 and the proton exchange layer 5 on the reference plane S have a second overlapping projection T2, the reference plane S is a plane perpendicular to the first direction F1, the second overlapping projection T2 has a second inner contour N2 disposed near the center of the battery cell 100, and a second outer contour W2 disposed at intervals from the second inner contour N2, and the spacing between the second inner contour N2 and the second outer contour W2 is 1.5 mm to 30 mm", similarly, the battery cell 100 can have both good sealing and good power generation performance. If the spacing is too small, the bonding force and durability between the first bonding portion 21 and the proton exchange layer 5 are affected, thereby affecting the sealing performance of the battery cell 100. If the spacing is too large, the contact area between the gas diffusion layer and the proton exchange layer 5 is reduced, thereby affecting gas transmission and affecting the power generation performance of the battery cell 100. It can be understood that the spacing between the second inner contour N2 and the second outer contour W2 can be 1.5 mm, 5 mm, 10 mm, 20 mm, 25 mm, 30 mm, etc.

[0075] The above-mentioned “the orthographic projection of the edge portion of the first bonding portion 21 and the first gas diffusion layer 3 on the reference plane S has a first overlapping projection T1, the reference plane S is a plane perpendicular to the first direction F1, the first overlapping projection T1 has a first inner contour N1 arranged close to the center of the battery cell 100, and a first outer contour W1 arranged spaced apart from the first inner contour N1, and the spacing between the first inner contour N1 and the first outer contour W1 is 0.3 mm to 30 mm” and “the orthographic projection of the edge portion of the first bonding portion 21 and the proton exchange layer 5 on the reference plane S has a second overlapping projection T2, the reference plane S is a plane perpendicular to the first direction F1, the second overlapping projection T2 has a second inner contour N2 arranged close to the center of the battery cell 100, and a second outer contour W2 arranged spaced apart from the second inner contour N2, and the spacing between the second inner contour N2 and the second outer contour W2 is 1.5 mm to 30 mm” can be arbitrarily combined and set according to actual conditions.

[0076] In some embodiments of the present application, reference may be made to Figure 1 and Figure 2 The edge portion of the proton exchange layer 5 and the edge portion of the second gas diffusion layer 4 define a second clamping space C, and at least a portion of the first bonding portion 21 is clamped in the second clamping space C.

[0077] In this way, the adhesion between the proton exchange layer 5 and the second gas diffusion layer 4 and the adhesion between the proton exchange layer 5 and the first bonding portion 21 are strengthened, further reducing the risk of deformation of the proton exchange layer 5 during the operation of the battery cell 100. In addition, the second gas diffusion layer 4 is directly bonded to the first bonding portion 21, and there is no need to apply glue to the second gas diffusion layer 4, saving process costs.

[0078] In some embodiments of the present application, reference may be made to Figures 1 to 3 , the edge portion of the second gas diffusion layer 4 includes a fourth portion 41, a fifth portion 42, and a sixth portion 43 connected to the fourth portion 41 and the fifth portion 42, the fourth portion 41 is connected to the first bonding portion 21, the fifth portion 42 is connected to the proton exchange layer 5, and a second interval J2 is defined between the sixth portion 43 and the first bonding portion 21; and / or, the orthographic projections of the first bonding portion 21 and the edge portion of the second gas diffusion layer 4 on the reference plane S have a third overlapping projection T3, the reference plane S is a plane perpendicular to the first direction F1, the third overlapping projection T3 has a third inner contour N3 arranged near the center of the battery cell 100, and a third outer contour W3 arranged at an interval from the third inner contour N3, and the spacing between the third inner contour N3 and the third outer contour W3 is 1.5 mm to 30 mm; and / or, the orthographic projections of the second gas diffusion layer 4 and the proton exchange layer 5 on the reference plane S overlap with each other, and the reference plane S is a plane perpendicular to the first direction F1.

[0079] In some embodiments, including but not limited to the following:

[0080] In the case where “the edge portion of the second gas diffusion layer 4 includes a fourth portion 41, a fifth portion 42, and a sixth portion 43 connected to the fourth portion 41 and the fifth portion 42, the fourth portion 41 is connected to the first bonding portion 21, the fifth portion 42 is connected to the proton exchange layer 5, and a second interval J2 is defined between the sixth portion 43 and the first bonding portion 21”, by connecting the edge portion of the second gas diffusion layer 4 to the first bonding portion 21 and the proton exchange layer 5, respectively, the first bonding portion 21 is clamped between the first gas diffusion layer 3 and the proton exchange layer 5, which is simple to produce and easy to mass produce.

[0081] In the case where "the orthographic projections of the edge of the first bonding portion 21 and the second gas diffusion layer 4 on the reference plane S have a third overlapping projection T3, the reference plane S is a plane perpendicular to the first direction F1, the third overlapping projection T3 has a third inner contour N3 arranged close to the center of the battery cell 100, and a third outer contour W3 arranged at intervals from the third inner contour N3, and the spacing between the third inner contour N3 and the third outer contour W3 is 1.5mm to 30mm", the battery cell 100 can have both good sealing and good power generation performance. If the spacing is too small, the bonding force and durability of the first bonding portion 21 and the second gas diffusion layer 4 are affected, and the sealing performance of the battery cell 100 is further affected. If the spacing is too large, the contact area between the second gas diffusion layer 4 and the first bonding portion 21 will be reduced, and the gas transmission will be affected, so that the power generation performance of the battery cell 100 is affected. It can be understood that the spacing between the third inner contour N3 and the third outer contour W3 can be 0.3mm, 1mm, 5mm, 10mm, 20mm, 25mm and 30mm, etc.

[0082] When "the orthographic projections of the second gas diffusion layer 4 and the proton exchange layer 5 on the reference plane S overlap with each other, and the reference plane S is a plane perpendicular to the first direction F1", the force exerted by the second gas diffusion layer 4 on the bonding layer 2 and the force exerted by the proton exchange layer 5 on the bonding layer 2 are more uniform. The uniform force can reduce the deformation and vibration of the bonding layer 2, thereby improving the stability of the bonding layer 2. The uniform force can reduce stress concentration, thereby improving the durability and reliability of the bonding layer 2.

[0083] The above-mentioned “the edge portion of the second gas diffusion layer 4 includes a fourth portion 41, a fifth portion 42, and a sixth portion 43 connected to the fourth portion 41 and the fifth portion 42, the fourth portion 41 is connected to the first bonding portion 21, the fifth portion 42 is connected to the proton exchange layer 5, and a second interval J2 is defined between the sixth portion 43 and the first bonding portion 21”, “the orthographic projections of the first bonding portion 21 and the edge portion of the second gas diffusion layer 4 on the reference plane S have a third overlapping projection T3, the reference plane S is a plane perpendicular to the first direction F1, the third overlapping projection T3 has a third inner contour N3 arranged near the center of the battery cell 100, and a third outer contour W3 spaced from the third inner contour N3, and the spacing between the third inner contour N3 and the third outer contour W3 is 1.5 mm to 30 mm” and “the orthographic projections of the second gas diffusion layer 4 and the proton exchange layer 5 on the reference plane S overlap with each other, and the reference plane S is a plane perpendicular to the first direction F1” can be arbitrarily combined and arranged according to actual conditions.

[0084] In some embodiments of the present application, continue to refer to Figure 1 , and combined with reference Figure 4 and Figure 5 , Figure 4 A schematic top view of a battery cell 100 provided in some embodiments of the present application is shown in FIG. Figure 5 for Figure 4 Schematic cross-sectional view of the battery cell 100 at bb in FIG. The inner contour of the orthographic projection of the bonding layer 2 on the reference plane S overlaps with the outer contour of the orthographic projection of the second gas diffusion layer 4 on the reference plane S, and the reference plane S is a plane perpendicular to the first direction F1. The bonding layer 2 is directly attached to the second gas diffusion layer 4, and there is no need to apply glue to the second gas diffusion layer 4, which saves process costs.

[0085] In some embodiments of the present application, reference may be made to Figure 1 and Figure 4 , the material of the adhesive layer 2 includes ethylene-vinyl acetate copolymer film; and / or, the elastic modulus of the adhesive layer 2 is 10 MPa to 500 MPa; and / or, the size of the adhesive layer 2 along the first direction F1 is 20 μm to 300 μm.

[0086] In some embodiments, including but not limited to the following:

[0087] In the case where "the material of the adhesive layer 2 includes an ethylene-vinyl acetate copolymer film", the cost of the film is low, which can reduce the production cost of the battery cell 100. The adhesive layer 2 can be an organic encapsulation film such as an ethylene-vinyl acetate copolymer (EVA) film, a polyethylene octene co-elastomer (POE) film or a polyethylene terephthalate (PET) film.

[0088] When the elastic modulus of the bonding layer 2 is 10 MPa to 500 MPa, the adhesion of the bonding layer 2 and the durability of the proton exchange layer 5 can be further improved. If the elastic modulus of the bonding layer 2 is too large, the bonding layer 2 has poor fluidity under hot pressing conditions, resulting in reduced adhesion of the adhesive layer. If the elastic modulus of the bonding layer 2 is too small, the external stress is not borne by the bonding layer 2 of the membrane electrode and is directly transmitted to the proton exchange layer 5, reducing the durability of the proton exchange layer 5. It is understandable that the elastic modulus of the bonding layer 2 can be 10 MPa, 20 MPa, 50 MPa, 100 MPa, 200 MPa, 400 MPa, 500 MPa, etc.

[0089] In the case where the size of the adhesive layer 2 along the first direction F1 is 20 μm to 300 μm, the adhesive layer 2 can have both good sealing and reliability. If the size of the adhesive layer 2 along the first direction F1 is too large, the adhesive layer may not be able to evenly distribute the force during the hot pressing process, causing stress concentration in the adhesive layer 2, which in turn makes the adhesive layer vulnerable to damage and reduces the service life of the adhesive layer. If the size of the adhesive layer 2 along the first direction F1 is too small, the adhesive layer may not be able to provide sufficient bonding strength, resulting in reduced sealing of the battery cell 100.

[0090] In addition, the initial viscosity of the adhesive layer 2 is 0N / cm, and the open circuit voltage insulation is 0A@1.5V, the temperature is controlled at 90°C to 120°C, the pressure is 0.5MPa to 1.5MPa, and the duration is controlled between 10s and 90s. During the bonding and sealing process using the adhesive layer 2, the amount of glue overflowing from the edge of the bonding area, that is, the size of the overflowed glue along the first direction F1 can be controlled to be 0.2mm to 0.4mm. If the amount of overflowed glue is too small, the adhesion of the adhesive layer 2 is affected. If the amount of overflowed glue is too large, the dimensional tolerance design of the battery cell 100 is affected, and then the performance and reliability of the battery cell 100 are affected.

[0091] The above-mentioned "the material of the bonding layer 2 includes ethylene-vinyl acetate copolymer film", "the elastic modulus of the bonding layer 2 is 10MPa to 500MPa" and "the size of the bonding layer 2 along the first direction F1 is 20μm to 300μm" can be arbitrarily combined and set according to actual conditions.

[0092] For ease of understanding, the present application provides multiple embodiments and multiple comparative examples in conjunction with the following Table 1, the specific details of which are as follows:

[0093] The battery cells 100 in the first embodiment, the second embodiment and the third embodiment are all based on Figure 1 Layout.

[0094] In the first embodiment, the orthographic projections of the edge portion of the first bonding portion 21 and the first gas diffusion layer 3 on the reference plane S have a first overlapping projection T1, the reference plane S is a plane perpendicular to the first direction F1, the first overlapping projection T1 has a first inner contour N1 disposed near the center of the battery cell 100, and a first outer contour W1 disposed at intervals from the first inner contour N1, and the spacing between the first inner contour N1 and the first outer contour W1 is 0.3 mm. The orthographic projections of the edge portion of the first bonding portion 21 and the second gas diffusion layer 4 on the reference plane S have a third overlapping projection T3, the reference plane S is a plane perpendicular to the first direction F1, the third overlapping projection T3 has a third inner contour N3 disposed near the center of the battery cell 100, and a third outer contour W3 disposed at intervals from the third inner contour N3, and the spacing between the third inner contour N3 and the third outer contour W3 is 1.5 mm. The orthographic projections of the first bonding portion 21 and the edge portion of the proton exchange layer 5 on the reference plane S have a second overlapping projection T2. The reference plane S is a plane perpendicular to the first direction F1. The second overlapping projection T2 has a second inner contour N2 disposed near the center of the battery cell 100 and a second outer contour W2 disposed at intervals from the second inner contour N2. The spacing between the second inner contour N2 and the second outer contour W2 is 1.5 mm. The compression rate of the first gas diffusion layer 3 and the compression rate of the second gas diffusion layer 4 are both set to 15%. The size of the bonding layer 2 in the first direction F1 is 20 μm, and the elastic modulus is set to 10 MPa.

[0095] In the second embodiment, the orthographic projections of the edge portions of the first bonding portion 21 and the second gas diffusion layer 4 on the reference plane S have a third overlapping projection T3, the reference plane S is a plane perpendicular to the first direction F1, the third overlapping projection T3 has a third inner contour N3 disposed near the center of the battery cell 100, and a third outer contour W3 disposed at intervals from the third inner contour N3, and the spacing between the third inner contour N3 and the third outer contour W3 is 2 mm. The orthographic projections of the edge portions of the first bonding portion 21 and the second gas diffusion layer 4 on the reference plane S have a third overlapping projection T3, the reference plane S is a plane perpendicular to the first direction F1, the third overlapping projection T3 has a third inner contour N3 disposed near the center of the battery cell 100, and a third outer contour W3 disposed at intervals from the third inner contour N3, and the spacing between the third inner contour N3 and the third outer contour W3 is 1 mm. The orthographic projection of the first bonding portion 21 and the edge portion of the proton exchange layer 5 on the reference plane S has a second overlapping projection T2, the reference plane S is a plane perpendicular to the first direction F1, and the second overlapping projection T2 has a second inner contour N2 arranged near the center of the battery cell 100, and a second outer contour W2 spaced apart from the second inner contour N2, and the spacing between the second inner contour N2 and the second outer contour W2 is 2mm. The compression rate of the first gas diffusion layer 3 and the compression rate of the second gas diffusion layer 4 are both set to 15%. The size of the bonding layer 2 in the first direction F1 is 200μm, and the elastic modulus is set to 16MPa.

[0096] In the third embodiment, the orthographic projections of the edge portions of the first bonding portion 21 and the second gas diffusion layer 4 on the reference plane S have a third overlapping projection T3, the reference plane S is a plane perpendicular to the first direction F1, the third overlapping projection T3 has a third inner contour N3 disposed near the center of the battery cell 100, and a third outer contour W3 disposed at intervals from the third inner contour N3, and the spacing between the third inner contour N3 and the third outer contour W3 is 30 mm. The orthographic projections of the edge portions of the first bonding portion 21 and the second gas diffusion layer 4 on the reference plane S have a third overlapping projection T3, the reference plane S is a plane perpendicular to the first direction F1, the third overlapping projection T3 has a third inner contour N3 disposed near the center of the battery cell 100, and a third outer contour W3 disposed at intervals from the third inner contour N3, and the spacing between the third inner contour N3 and the third outer contour W3 is 30 mm. The orthographic projections of the first bonding portion 21 and the edge of the proton exchange layer 5 on the reference plane S have a second overlapping projection T2, the reference plane S is a plane perpendicular to the first direction F1, and the second overlapping projection T2 has a second inner contour N2 arranged near the center of the battery cell 100, and a second outer contour W2 arranged at intervals from the second inner contour N2, and the spacing between the second inner contour N2 and the second outer contour W2 is 30 mm. The compression rate of the first gas diffusion layer 3 and the compression rate of the second gas diffusion layer 4 are both set to 35%. The size of the bonding layer 2 in the first direction F1 is 300 μm, and the elastic modulus is set to 500 MPa.

[0097] In the first comparative example, the size of the second gas diffusion layer 4 is the same as that of the proton exchange layer 5, and the rest is the same as the second embodiment. In the second comparative example, the material of the adhesive layer is replaced by the adhesive film and polyethylene naphthalate composite structure material, and the rest is the same as the second embodiment.

[0098] In the third comparative example, except that the orthographic projections of the first bonding portion 21 and the edge portion of the proton exchange layer 5 on the reference plane S have a second overlapping projection T2, the reference plane S is a plane perpendicular to the first direction F1, the second overlapping projection T2 has a second inner contour N2 arranged close to the center of the battery cell 100, and a second outer contour W2 spaced apart from the second inner contour N2, and the spacing between the second inner contour N2 and the second outer contour W2 is 40 mm, the rest is the same as the second embodiment.

[0099] In the fourth comparative example, except that the orthographic projections of the first bonding portion 21 and the edge portion of the proton exchange layer 5 on the reference plane S have a second overlapping projection T2, the reference plane S is a plane perpendicular to the first direction F1, the second overlapping projection T2 has a second inner contour N2 arranged close to the center of the battery cell 100, and a second outer contour W2 spaced apart from the second inner contour N2, and the spacing between the second inner contour N2 and the second outer contour W2 is 1 mm, the rest is the same as the second embodiment.

[0100] In the fifth comparative example, except that the elastic modulus of the adhesive layer 2 is set to 2.7 MPa, the rest is the same as the second embodiment. In the sixth comparative example, except that the elastic modulus of the adhesive layer 2 is set to 700 MPa, the rest is the same as the second embodiment.

[0101] In the seventh comparative example, except that the compression rate of the fourth portion 41 of the second gas diffusion layer 4 is 45%, the compression rate of the fifth portion 42 is 24%, the compression rate of the first portion 31 of the first gas diffusion layer 3 is 35%, the compression rate of the third portion 33 overlapping with the proton exchange layer 5 is 24%, and the compression rate of the third portion 33 overlapping with both the proton exchange layer 5 and the bonding layer 2 is 45%, the rest are the same as the second embodiment.

[0102] When the battery inlet temperature was 80°C, the cathode humidity was 60%, the anode humidity was 100%, the cathode-anode stoichiometric ratio was 1.2, and the test pressure was 100 kPa, the test results of the stack volume power density were obtained as shown in Table 1.

[0103] Clamp the battery cell 100 in a single-cell test fixture, seal the anode outlet, cathode inlet and coolant inlet and outlet of the fuel cell stack, connect a flow meter to the cathode outlet, introduce nitrogen from the anode inlet, adjust the pressure to 100 kPa, read the flow meter reading, and record the time when the leakage is greater than 1 mL / min to obtain the test results of the airtightness durability time shown in Table 1.

[0104] In Table 1, the stack volume power density refers to the power that the fuel cell can output per unit volume, and the airtightness durability time refers to the length of time that a sealing system or component can maintain its airtightness.

[0105] It can be seen from the second embodiment and the first comparative example that the first bonding portion 21 is connected to the edge portion of the first gas diffusion layer 3 and defines a first clamping space B. The design in which the edge portion of the proton exchange layer 5 is clamped in the first clamping space B can improve the airtight durability of the battery cell 100.

[0106] It can be seen from the second embodiment and the second comparative example that the material of the adhesive layer 2 is changed from a combination of hard plastic and adhesive film to adhesive film, which can reduce the material process cost.

[0107] It can be seen from the second embodiment and the third comparative example that the orthographic projections of the edge portions of the first bonding portion 21 and the proton exchange layer 5 on the reference plane S have a second overlapping projection T2, and the reference plane S is a plane perpendicular to the first direction F1. The second overlapping projection T2 has a second inner contour N2 arranged close to the center of the battery cell 100, and a second outer contour W2 spaced apart from the second inner contour N2. If the spacing between the second inner contour N2 and the second outer contour W2 is too large, the contact area between the gas diffusion layer and the proton exchange layer 5 will be reduced, thereby affecting gas transmission and affecting the power generation performance of the battery cell 100.

[0108] Table 1

[0109]

[0110] It can be seen from the second embodiment and the fourth comparative example that the orthographic projections of the edge portions of the first bonding portion 21 and the proton exchange layer 5 on the reference plane S have a second overlapping projection T2, and the reference plane S is a plane perpendicular to the first direction F1. The second overlapping projection T2 has a second inner contour N2 arranged close to the center of the battery cell 100, and a second outer contour W2 spaced apart from the second inner contour N2. If the spacing between the second inner contour N2 and the second outer contour W2 is too small, it will affect the bonding strength and durability of the first bonding portion 21 and the proton exchange layer 5, and further affect the sealing performance of the battery cell 100.

[0111] It can be seen from the second embodiment and the fifth comparative example that if the elastic modulus of the adhesive layer 2 is too small, the external stress is not borne by the adhesive layer 2 of the membrane electrode but is directly transmitted to the proton exchange layer 5 , reducing the durability of the proton exchange layer 5 .

[0112] It can be seen from the second embodiment and the sixth comparative example that if the elastic modulus of the adhesive layer 2 is too large, the adhesive layer 2 has poor fluidity under hot pressing conditions, resulting in reduced adhesion of the adhesive layer.

[0113] It can be seen from the second embodiment and the seventh comparative example that if the compression ratio of the gas diffusion layer is different, the transmission resistance of the gas in the battery cell 100 will increase, thereby reducing the ability to discharge water, and affecting the power generation performance of the battery cell 100. If the compression ratio is too small, the contact resistance between the gas diffusion layer and the proton exchange layer 5 will increase, thereby affecting the power generation performance of the battery cell 100. If the compression ratio is too large, it will affect the transmission rate of the gas in the battery cell 100, thereby affecting the ability to discharge water, and further affecting the power generation performance of the battery cell 100.

[0114] This application provides a method for manufacturing a battery cell. Figure 6 , Figure 6 This is a flow chart of an embodiment of a battery cell manufacturing method provided in the present application. The battery cell method comprises the following steps:

[0115] Step S100, rolling and aligning the bonding layer and the proton exchange layer to form a first pressed body;

[0116] Step S200, the first gas diffusion layer, the second gas diffusion layer, the two electrode plates and the first pressed body are pressed together by a flat pressing alignment process to form a second pressed body; wherein the bonding layer is sandwiched between the two electrode plates and defines a packaging cavity with the two electrode plates, the first gas diffusion layer, the proton exchange layer and the second gas diffusion layer are stacked and located in the packaging cavity, the bonding layer includes a first bonding portion arranged opposite to an edge portion of the first gas diffusion layer, an edge portion of the first gas diffusion layer in the second target layer is connected to the first bonding portion and defines a first clamping space, and an edge portion of the proton exchange layer is clamped in the first clamping space;

[0117] Step S300: performing a lamination process on the second pressed body through a flat pressing lamination process to form a battery cell.

[0118] In step S100, the adhesive layer and the proton exchange layer are rolled and aligned. "Rolling" refers to the process of applying pressure to the material through two or more rollers to compact it. "Alignment" refers to aligning the adhesive layer and the proton exchange layer. Specifically in the present application, the adhesive layer and the proton exchange layer are rolled together after being aligned. The rolling temperature can be 50°C to 70°C.

[0119] Thus, by rolling, the contact area between the adhesive layer and the proton exchange layer is increased, thereby improving the bonding strength between the two.

[0120] In step S200, the first gas diffusion layer, the second gas diffusion layer, the two electrode plates and the first pressed body are pressed together to form a second pressed body through a flat pressing and alignment process, wherein the order of pressing the first gas diffusion layer, the second gas diffusion layer, the two electrode plates and the first pressed body is not limited as long as the second pressed body can be formed.

[0121] In this way, the flat pressing alignment process can be automated and continuously produced, improving production efficiency. Among them, the "flat pressing alignment process" refers to placing two materials to be bonded horizontally on two platforms, with the initial positions of the two platforms being tangentially relative positions set according to the equipment program, and normal relative positions being parallel and maintaining a certain distance; reducing the normal relative distance between the two platforms until the two materials to be bonded are bonded to achieve flat pressing alignment.

[0122] Furthermore, through the flat pressing alignment process, the first gas diffusion layer, the second gas diffusion layer, the proton exchange layer and the electrode plate can be closely fitted in the packaging cavity, thereby improving the integrity and sealing of the battery cell packaging.

[0123] In step S300 , the second pressed body is laminated by a flat pressing process to form a battery cell.

[0124] In this way, the second pressed body is more tightly fitted, and the formed battery cell has better sealing performance.

[0125] In some embodiments, continue to refer to Figure 6 , and combined with reference Figure 7 , Figure 7 for Figure 6 Flow chart of other steps of the battery cell manufacturing method in FIG. 1 . Step S300 includes the following steps:

[0126] Step S301, performing a flat pressing pre-lamination process on the second pressed body to form a third pressed body;

[0127] Step S302: performing a flat pressing and laminating process on the third pressed body to form a battery cell.

[0128] In step S301, "flat pressing pre-lamination" refers to the preliminary positioning and fixing of multiple layered materials during the manufacturing process.

[0129] Thus, pre-lamination can reduce the positioning and adjustment time in the subsequent processing or assembly steps, thereby improving production efficiency. Pre-lamination can also ensure the precise alignment between the layers of materials, thereby improving the quality of the battery cell.

[0130] In step S302, the third pressed body is flat-pressed and bonded so that the adhesive layer can be tightly bonded to the first gas diffusion layer, the second gas diffusion layer, the proton exchange layer and the electrode plate, thereby further improving the integrity and sealing of the battery cell packaging.

[0131] In some embodiments, in step S301, during the flat-press pre-lamination process, a first pressure is applied to the second lamination body for a first time at a first preset temperature and a first vacuum degree; wherein the first preset temperature is 50° C. to 70° C., the first vacuum degree is 0.08 MPa to 0.12 MPa, the first pressure is 0.3 MPa to 1.5 MPa, and the first time is 5 s to 30 s. The applicant has found that under this condition, the flat-press pre-lamination process can achieve a better effect.

[0132] In some embodiments, in step S302, during the flat pressing and laminating process, a second pressure is applied to the third laminating body for a second time at a second preset temperature; wherein the second preset temperature is 90° C. to 120° C., the second pressure is 0.5 MPa to 1.5 MPa, and the second time is 10 s to 90 s. The inventors found that under this condition, the flat pressing and laminating process can achieve better results.

[0133] In some embodiments, continue to refer to Figure 6 , and combined with reference Figure 8 , Figure 8 for Figure 6 Flow chart of other steps of the battery cell manufacturing method in FIG. 1 . Step S200 includes the following steps:

[0134] Step S201: At a third preset temperature, the first gas diffusion layer and the first pressed body are subjected to a flat pressing and alignment process; one of the two electrode plates and the first pressed body are subjected to a flat pressing and alignment process; the second gas diffusion layer and the side of the proton exchange layer facing away from the first gas diffusion layer are subjected to a flat pressing and alignment process, and the other electrode plate of the two electrode plates and the bonding layer are subjected to a flat pressing and alignment process to form a second pressed body, wherein the third preset temperature is 50°C to 70°C.

[0135] In step S201, at the third preset temperature, the first gas diffusion layer is first aligned with the first pressed body, which can provide a stable structural basis for subsequent stacking, and then the electrode plate and the first pressed body are processed by a flat pressing alignment process, without adjusting the bonding surface of the proton exchange layer, which simplifies the process flow, and then the second gas diffusion layer and the side of the proton exchange layer away from the first gas diffusion layer are processed by a flat pressing alignment process, and the other electrode plate of the two electrodes is flat pressed and aligned with the bonding layer to form a second pressed body, which simplifies the bonding process and improves production efficiency. In addition, the applicant found that when the third preset temperature is set to 50°C to 70°C, the effect of the flat pressing bonding process can be better.

[0136] Therefore, the battery cell 100 of the present application not only has good sealing performance, but also has the advantage of low cost, that is, not only the material cost is low, but also the process cost is low.

[0137] Based on the same inventive concept, the present application provides a fuel cell, including the battery cell 100 in any of the above embodiments; and / or, including the manufacturing method of the battery cell 100 in any of the above embodiments. The advantages of the above battery cell 100 are also possessed by the fuel cell, which will not be elaborated here.

[0138] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0139] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A battery cell, characterized in that: include: Two pole plates are arranged opposite to each other along a first direction; An adhesive layer, sandwiched between the two electrode plates, and defining a packaging cavity with the two electrode plates; and A membrane electrode assembly is sandwiched between the two electrode plates and is located in the packaging cavity; the membrane electrode assembly comprises a first gas diffusion layer, a proton exchange layer and a second gas diffusion layer stacked along a first direction; The bonding layer includes a first bonding portion arranged opposite to an edge portion of the first gas diffusion layer, the first bonding portion is connected to an edge portion of the first gas diffusion layer and defines a first clamping space, and an edge portion of the proton exchange layer is clamped in the first clamping space.

2. The battery cell according to claim 1, characterized in that: The edge portion of the first gas diffusion layer includes a first portion, a second portion, and a third portion connected to the first portion and the second portion; The first portion is connected to the first bonding portion, the second portion is connected to the proton exchange layer, and a first interval is defined between the third portion and the first bonding portion.

3. The battery cell according to claim 2, characterized in that: Along the first direction, the size of the first portion, the size of the second portion and the size of the third portion are the same; and / or The compression ratio of the first part, the compression ratio of the second part and the compression ratio of the third part are the same; and / or The compression rate of the edge portion of the first gas diffusion layer is 15% to 35%.

4. The battery cell according to any one of claims 1 to 3, characterized in that: The orthographic projections of the first bonding portion and the edge portion of the first gas diffusion layer on a reference plane have a first overlapping projection; the reference plane is a plane perpendicular to the first direction; the first overlapping projection has a first inner contour disposed near the center of the battery cell, and a first outer contour disposed at a distance from the first inner contour; the spacing between the first inner contour and the first outer contour is 0.3 mm to 30 mm; and / or The orthographic projections of the first bonding portion and the edge portion of the proton exchange layer on a reference plane have a second overlapping projection; the reference plane is a plane perpendicular to the first direction; the second overlapping projection has a second inner contour arranged close to the center of the battery cell, and a second outer contour arranged at intervals from the second inner contour; the spacing between the second inner contour and the second outer contour is 1.5 mm to 30 mm.

5. The battery cell according to any one of claims 1 to 3, characterized in that: The edge portion of the proton exchange layer and the edge portion of the second gas diffusion layer define a second clamping space; At least a portion of the first bonding portion is clamped in the second clamping space.

6. The battery cell according to claim 5, characterized in that: The edge portion of the second gas diffusion layer includes a fourth portion, a fifth portion, and a sixth portion connected to the fourth portion and the fifth portion; the fourth portion is connected to the first bonding portion, the fifth portion is connected to the proton exchange layer, and a second interval is defined between the sixth portion and the first bonding portion; and / or The orthographic projections of the first bonding portion and the edge portion of the second gas diffusion layer on a reference plane have a third overlapping projection; the reference plane is a plane perpendicular to the first direction; the third overlapping projection has a third inner contour disposed near the center of the battery cell, and a third outer contour disposed at intervals from the third inner contour; the spacing between the third inner contour and the third outer contour is 1.5 mm to 30 mm; and / or Orthographic projections of the second gas diffusion layer and the proton exchange layer on a reference plane overlap with each other, and the reference plane is a plane perpendicular to the first direction.

7. The battery cell according to any one of claims 1 to 3, characterized in that: An inner contour of an orthographic projection of the bonding layer on a reference surface overlaps with an outer contour of an orthographic projection of the second gas diffusion layer on the reference surface; the reference surface is a plane perpendicular to the first direction.

8. The battery cell according to any one of claims 1 to 3, characterized in that: The material of the adhesive layer includes ethylene-vinyl acetate copolymer film; and / or The elastic modulus of the bonding layer is 10 MPa to 500 MPa; and / or The size of the adhesive layer along the first direction is 20 μm to 300 μm.

9. A method for manufacturing a battery cell, characterized in that: include: Rolling and aligning the bonding layer and the proton exchange layer to form a first pressed body; The first gas diffusion layer, the second gas diffusion layer, the two electrode plates and the first pressed body are pressed together by a flat pressing alignment process to form a second pressed body; wherein the bonding layer is sandwiched between the two electrode plates and defines a packaging cavity with the two electrode plates; the first gas diffusion layer, the proton exchange layer and the second gas diffusion layer are stacked and located in the packaging cavity; the bonding layer includes a first bonding portion arranged opposite to an edge portion of the first gas diffusion layer; an edge portion of the first gas diffusion layer in the second target layer is connected to the first bonding portion and defines a first clamping space; an edge portion of the proton exchange layer is clamped in the first clamping space; The second pressed body is laminated by a flat pressing process to form a battery cell.

10. The method for manufacturing a battery cell according to claim 9, characterized in that: The laminating process of the second pressed body by a flat pressing laminating process to form a battery cell includes: performing a flat pressing pre-lamination process on the second pressed body to form a third pressed body; The third pressed body is subjected to a flat pressing and laminating process to form the battery cell.

11. The method for manufacturing a battery cell according to claim 10, characterized in that: During the flat-press pre-lamination process, a first pressure is applied to the second lamination body for a first time at a first preset temperature and a first vacuum degree; wherein the first preset temperature is 50° C. to 70° C., the first vacuum degree is 0.08 MPa to 0.12 MPa, the first pressure is 0.3 MPa to 1.5 MPa, and the first time is 5 s to 30 s; and / or During the flat pressing and laminating process, at a second preset temperature, a second pressure is applied to the third pressing body for a second time period; wherein the second preset temperature is 90°C to 120°C, the second pressure is 0.5MPa to 1.5MPa, and the second time period is 10s to 90s.

12. The method for manufacturing a battery cell according to any one of claims 9 to 11, characterized in that: The method of forming a second pressed body by pressing the first gas diffusion layer, the second gas diffusion layer, the two polar plates and the first pressed body through a flat pressing alignment process includes: At a third preset temperature, the first gas diffusion layer and the first pressed body are processed by a flat pressing and alignment process; one of the two electrode plates and the first pressed body are processed by a flat pressing and alignment process; the second gas diffusion layer and the side of the proton exchange layer facing away from the first gas diffusion layer are processed by a flat pressing and alignment process, and the other of the two electrode plates and the bonding layer are flat pressed and aligned to form a second pressed body, so as to form a second pressed body, wherein the third preset temperature is 50°C to 70°C.

13. A fuel cell, characterized in that: A battery cell comprising a battery cell as claimed in any one of claims 1 to 8; and / or The invention comprises a battery cell manufactured by the method for manufacturing a battery cell according to any one of claims 9 to 12.

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