End plate assembly and electric pile

Abstract

The utility model provides an end plate assembly and a galvanic pile, the end plate assembly is used for being arranged on the outer side of a current collecting component of the galvanic pile and insulated from the current collecting component, the end plate assembly comprises a visual structure, at least part of the outline of the visual structure is arranged opposite to at least part of a manifold channel in the extension direction of the manifold channel of the galvanic pile, and at least part of the outline of the visual structure is arranged opposite to at least part of the manifold channel. And the water accumulation condition at the end part of the manifold channel can be observed through the visual structure. According to the scheme, the problem that a galvanic pile in the prior art does not have a condition for observing the water accumulation condition at the position, close to the end plate, of the manifold channel, so that the relationship between the water accumulation condition at the position, close to the end plate, of the manifold channel and the performance of the galvanic pile cannot be analyzed and evaluated can be solved.

Description

Technical Field

[0001] The utility model relates to the field of fuel cells, and in particular to an end plate assembly and a fuel cell stack. Background Art

[0002] As an energy conversion device, fuel cells can directly convert the chemical energy of fuel into electrical energy. They have the advantages of high energy density, high efficiency, and environmental friendliness, and have received widespread attention in recent years.

[0003] A fuel cell stack typically consists of a core and end plates, which are located outside the core's current collecting components. Manifold channels are formed within the core for fluid circulation. Water is prone to accumulation near the end plates, which can affect the stack's performance and durability.

[0004] However, the fuel cell stack in the prior art usually does not have the conditions to observe the water accumulation in the manifold channel near the end plate, and thus cannot analyze and evaluate the relationship between the water accumulation in the manifold channel near the end plate and the fuel cell stack performance. Utility Model Content

[0005] The utility model provides an end plate assembly and a fuel cell stack to solve the problem in the prior art that the fuel cell stack does not have the conditions to observe the water accumulation situation near the end plate of the manifold channel, and thus cannot analyze and evaluate the relationship between the water accumulation situation near the end plate of the manifold channel and the performance of the fuel cell stack.

[0006] According to one aspect of the present invention, an end plate assembly is provided, which is used to be arranged on the outside of the current collecting component of the battery stack and insulated from the current collecting component. The end plate assembly includes a visualization structure. In the extension direction of the manifold channel of the battery stack, at least a part of the outline of the visualization structure is arranged relative to at least a part of the manifold channel, so that the water accumulation at the end of the manifold channel can be observed through the visualization structure.

[0007] Furthermore, the end plate assembly includes a first end plate assembly, and the first end plate assembly includes: a first end plate component, which is used to be arranged on the outside of the first current collecting component of the battery stack, and a first observation port is provided on the first end plate component, and the first observation port is arranged through the first end plate component along the thickness direction, and in the extension direction of the manifold channel of the battery stack, at least part of the outline of the first observation port is arranged opposite to at least part of the manifold channel; a first insulating plate, which is arranged on the side of the first end plate component close to the first current collecting component, and the first insulating plate has a transparent area, and the projection of the first observation port is located in the transparent area along the direction from the first end plate component to the first insulating plate, and the transparent area cooperates with the first observation port to form a visual structure.

[0008] Furthermore, along the thickness direction of the first end plate component, the first observation port includes a first opening and a second opening that are interconnected, the second opening is arranged close to the first insulating plate, at least one first opening is provided, the number of second openings is greater than or equal to the number of first openings, the second openings are arranged corresponding to the manifold channel, and the outline of at least one second opening is located within the outline of a first opening.

[0009] Furthermore, the first end plate component includes: a first metal plate, a first opening is provided on the first metal plate, and the first opening passes through the first metal plate along the thickness direction of the first metal plate; a second insulating plate, a second opening is provided on the second insulating plate, and the second opening passes through the second insulating plate along the thickness direction of the second insulating plate.

[0010] Furthermore, a first sealing portion is provided on a side of the first insulating plate close to the first current collecting component, and the first sealing portion is adapted to a profile of an end portion of the manifold channel.

[0011] Furthermore, the end plate assembly also includes a second end plate assembly, which includes: a second end plate component, which is used to be arranged on the outside of the second current collecting component of the fuel cell stack, and the second end plate component is provided with a second observation port, and the second observation port is provided through the second end plate component along the thickness direction, and the second observation port is arranged opposite to and connected with the end of the manifold channel; a transparent manifold part, which is arranged on the second end plate component and blocks the second observation port, and the transparent manifold part is provided with a flow hole, which passes through the transparent manifold part, and the flow hole is used for fluid circulation and is connected with the manifold channel.

[0012] Furthermore, along the thickness direction of the second end plate component, the second observation port includes a third opening and a fourth opening that are interconnected, the third opening is arranged close to the transparent manifold portion, at least one third opening is provided, the number of fourth openings is greater than or equal to the number of third openings, the fourth openings are arranged corresponding to the manifold channel, and the outline of at least one fourth opening is located within the outline of a third opening.

[0013] Furthermore, the second end plate component includes: a second metal plate, a third opening is provided on the second metal plate, and the third opening passes through the second metal plate along the thickness direction of the second metal plate; a third insulating plate is provided on a side of the second metal plate close to the second current collecting component, and a fourth opening is provided on the third insulating plate, and the fourth opening passes through the third insulating plate along the thickness direction of the third insulating plate.

[0014] Furthermore, the transparent manifold portion includes a first section and a second section connected to each other, the cross-sectional area of ​​the first section is smaller than the cross-sectional area of ​​the second section, the flow hole passes through the first section and the second section, the first section is arranged in the third opening, and the second section is located on the side of the second end plate component away from the second collecting component.

[0015] According to another aspect of the present invention, a fuel cell stack is provided, which includes: a core having a manifold channel, which extends along the stacking direction of the core; a current collecting component, which is arranged at the end of the core in the stacking direction; the above-mentioned end plate assembly, which is arranged on the side of the current collecting component away from the core, and at least a part of the outline of the visualization structure of the end plate assembly is arranged opposite to at least a part of the manifold channel, so that the water accumulation situation of the manifold channel near the end plate assembly can be observed through the visualization structure.

[0016] By applying the technical solution of the present invention, a visualization structure can be provided on the end plate assembly, allowing workers to intuitively and promptly monitor water accumulation at the ends of the manifold channels without the need for complex disassembly or invasive inspections. Furthermore, the observed water accumulation allows workers to accurately analyze the amount of water accumulated at the ends of the manifold channels, the trends and patterns of water accumulation, and assess the specific impact of water accumulation at the ends of the manifold channels on the performance of the fuel cell stack. This provides important reference information for optimizing fuel cell stack performance and provides data support for fuel cell stack design, operation, and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 A schematic diagram of the explosion structure of a battery stack provided by an embodiment of the present utility model is shown;

[0019] Figure 2 An axonometric view of a first end plate assembly provided by an embodiment of the present utility model is shown;

[0020] Figure 3 Shows a front view of a first end plate assembly provided by an embodiment of the present utility model;

[0021] Figure 4 An axonometric view of a second end plate assembly provided by an embodiment of the present utility model is shown;

[0022] Figure 5 A front view of a second end plate assembly provided by an embodiment of the present invention is shown.

[0023] The above drawings include the following reference numerals:

[0024] 10. First end plate assembly;

[0025] 101, first observation port; 1011, first opening; 1012, second opening;

[0026] 11. First end plate component;

[0027] 111. First metal plate; 112. Second insulating plate;

[0028] 12. First insulating plate; 1201. First receiving groove;

[0029] 20. Second end plate assembly;

[0030] 201, second observation port; 2011, third opening; 2012, fourth opening;

[0031] 21. Second end plate component;

[0032] 211, second metal plate; 212, third insulating plate; 2121, second receiving groove;

[0033] 22. Transparent manifold portion; 2201. Flow hole;

[0034] 221, first paragraph; 222, second paragraph.

[0035] 01. The first current collecting component;

[0036] 02. Second current collecting component;

[0037] 03. Core; 031. Manifold channel. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] like Figure 1 As shown, an embodiment of the present invention provides an end plate assembly, which is used to be arranged on the outside of the current collecting component of the fuel cell stack and insulated from the current collecting component. The end plate assembly includes a visualization structure. In the extension direction of the manifold channel 031 of the fuel cell stack, at least a part of the outline of the visualization structure is arranged relative to at least a part of the manifold channel 031, so that the water accumulation at the end of the manifold channel 031 can be observed through the visualization structure.

[0040] By applying the technical solution of the present invention, a visualization structure can be provided on the end plate assembly, allowing workers to intuitively and promptly monitor water accumulation at the end of manifold channel 031 without the need for complex disassembly or invasive inspection. Furthermore, the observed water accumulation allows workers to accurately analyze the amount of water accumulated at the end of manifold channel 031, the trends and patterns of water accumulation, and assess the specific impact of water accumulation at the end of manifold channel 031 on the performance of the fuel cell stack. This provides important reference information for optimizing fuel cell stack performance and provides data support for fuel cell stack design, operation, and maintenance.

[0041] like Figures 1 to 3 As shown, in an embodiment of this solution, the end plate assembly includes a first end plate assembly 10, which includes a first end plate component 11 and a first insulating plate 12. The first end plate component 11 is disposed outside the first current collecting component 01 of the stack. A first observation port 101 is provided on the first end plate component 11, extending through the thickness of the first end plate component 11. In the direction of extension of the manifold channel 031 of the stack, at least a portion of the outline of the first observation port 101 is aligned with at least a portion of the manifold channel 031. A first insulating plate 12 is disposed on a side of the first end plate component 11 proximal to the first current collecting component 01. The first insulating plate 12 has a transparent region. The projection of the first observation port 101 from the first end plate component 11 to the first insulating plate 12 is located within the transparent region. The transparent region and the first observation port 101 form a visible structure. By providing the first insulating plate 12, this solution achieves effective insulation between the end plate assembly and the first current collecting component 01 of the stack, improving the safety and reliability of the stack. The provision of the first end plate component 11 enhances the structural strength of the end plate assembly, helping to withstand various mechanical stresses that the stack may experience during operation, thereby improving the stability and durability of the entire stack. A first observation port 101 penetrates the first end plate component 11 along its thickness, allowing operators or monitoring equipment to visually observe water accumulation at the end of the manifold channel 031 through the transparent area of ​​the first observation port 101, ensuring clarity and accuracy of observation.

[0042] It can be understood that the first insulating plate 12 is provided to cover the end of the fuel cell stack, so as to simultaneously achieve the effects of insulating the first current collecting component 01 and blocking the end of the manifold channel 031 .

[0043] Specifically, the first end plate assembly 10 is used to be installed at a blind end of the fuel cell stack, where the blind end of the fuel cell stack refers to an end of the manifold channel 031 that is away from the fluid inlet and / or fluid outlet.

[0044] In some embodiments of the present solution, a portion of the first insulating plate 12 corresponding to the manifold channel 031 is a transparent area, and the other portion is a non-transparent area.

[0045] In the embodiment of this solution, the first insulating plate 12 is a transparent plate-shaped structure as a whole, which can facilitate the processing of the first insulating plate 12.

[0046] Furthermore, along the thickness of the first end plate component 11, the first observation port 101 includes a first opening 1011 and a second opening 1012 that communicate with each other. The second opening 1012 is located near the first insulating plate 12. At least one first opening 1011 is provided, and the number of second openings 1012 is greater than or equal to the number of first openings 1011. The second openings 1012 are located corresponding to the manifold channels 031, and the outline of at least one second opening 1012 lies within the outline of a first opening 1011. The corresponding arrangement of the second openings 1012 with the manifold channels 031 ensures accurate observation. The outline of at least one second opening 1012 lies within the outline of a first opening 1011, which expands the observation range and enhances the level of detail.

[0047] In the embodiment of this solution, there is no limitation on the number of the first observation ports 101. There can be one or more first observation ports 101.

[0048] In the embodiment of this solution, two first observation ports 101 are provided. The shapes of the first observation ports 101 can be the same or different.

[0049] Specifically, the first insulating plate 12 is a rectangular plate-shaped structure. Two first observation ports 101 are spaced apart along the length of the first end plate component 11, and are located near the ends of the first end plate component 11 in the lengthwise direction. The first observation ports 101 extend along the width of the first end plate component 11. The two first observation ports 101 have the same shape.

[0050] In this embodiment, there is no limitation on the relationship between the number of the second openings 1012 and the number of the first openings 1011 in one first observation port 101 .

[0051] In some embodiments of this solution, the number of the second openings 1012 and the number of the first openings 1011 in each first observation port 101 are both one.

[0052] Alternatively, the number of the second openings 1012 in each first observation port 101 is greater than the number of the first openings 1011 . In this case, each first opening 1011 is connected to at least one second opening 1012 .

[0053] In the embodiment of this solution, each first observation port 101 includes a first opening 1011 and three second openings 1012 . The three second openings 1012 are spaced apart along the width direction of the first end plate component 11 .

[0054] It can be understood that in each first observation port 101, the first second opening 1012 is arranged corresponding to the manifold channel 031 for the circulation of anode gas, the second second opening 1012 is arranged corresponding to the manifold channel 031 for the supply of cathode gas, and the third second opening 1012 is arranged corresponding to the manifold channel 031 for the communication of coolant.

[0055] Furthermore, this solution does not limit the corresponding communication mode between the three second openings 1012 in each first observation port 101 and the anode gas, cathode gas or coolant, and can be determined according to the design of the fuel cell stack.

[0056] Furthermore, the first end plate component 11 includes a first metal plate 111 and a second insulating plate 112. A first opening 1011 is provided on the first metal plate 111 and extends through the first metal plate 111 along its thickness. A second opening 1012 is provided on the second insulating plate 112 and extends through the second insulating plate 112 along its thickness. This arrangement ensures both the mechanical strength of the end plate and the required insulation performance. The first opening 1011 and the second opening 1012 extend through the thickness of the first metal plate 111 and the second insulating plate 112, respectively. This through-hole design facilitates more intuitive observation while maintaining the structural integrity of the end plate component.

[0057] Furthermore, a first sealing portion is provided on the side of the first insulating plate 12 away from the first end plate component 11. The first sealing portion conforms to the contour of the end of the manifold channel 031. The design of the first sealing portion ensures a tight seal between the end of the manifold channel 031 and the first insulating plate 12, effectively preventing gas or liquid leakage and ensuring the stability and safety of the fluid within the fuel cell stack.

[0058] Specifically, a first receiving groove 1201 is provided on one side of the first insulating plate 12 near the first current collecting component 01, and the first sealing portion is installed in the first receiving groove 1201. The first receiving groove 1201 provides a precise installation position for the first sealing portion, allowing the first sealing portion to be directly embedded therein, simplifying the assembly process.

[0059] like Figure 1 、 Figure 4 and Figure 5As shown, the end plate assembly further includes a second end plate assembly 20, which includes a second end plate component 21 and a transparent manifold portion 22. The second end plate component 21 is used to be arranged on the outside of the second current collecting component 02 of the fuel cell stack. The second end plate component 21 is provided with a second observation port 201, which is provided through the second end plate component 21 along the thickness direction. The second observation port 201 is arranged opposite to and communicates with the end of the manifold channel 031; the transparent manifold portion 22 is provided on the second end plate component 21 and blocks the second observation port 201. The transparent manifold portion 22 is made of a transparent material and is provided with a flow hole 2201, which passes through the transparent manifold portion 22. The flow hole 2201 is used for fluid circulation and is communicated with the manifold channel 031.

[0060] It can be understood that the second end plate assembly 20 is used to be installed at one end of the fuel cell stack having a fluid inlet and / or a fluid outlet.

[0061] The flow hole 2201 of the transparent manifold part 22 is connected to the manifold channel 031, realizing the input or discharge of the fluid. The setting of the second observation port 201 and the cooperation of the transparent manifold part 22 enable the staff to observe one end of the fluid inlet or fluid outlet of the manifold channel 031.

[0062] Furthermore, along the thickness direction of the second end plate component 21, the second observation port 201 includes a third opening 2011 and a fourth opening 2012 that communicate with each other. The third opening 2011 is located near the transparent manifold portion 22. There is at least one third opening 2011, and the number of fourth openings 2012 is greater than or equal to the number of third openings 2011. The fourth openings 2012 are located corresponding to the manifold channel 031, and the outline of at least one fourth opening 2012 is located within the outline of one third opening 2011. The fourth openings 2012 are located corresponding to the manifold channel 031, which facilitates accurate monitoring of fluid flow and possible water accumulation within the manifold channel 031 corresponding to the fourth opening 2012.

[0063] Furthermore, the second end plate component 21 includes a second metal plate 211 and a third insulating plate 212. A third opening 2011 is provided on the second metal plate 211, extending through the second metal plate 211 along its thickness. The third insulating plate 212 is provided on a side of the second metal plate 211 adjacent to the second current collecting component 02. A fourth opening 2012 is provided on the third insulating plate 212, extending through the third insulating plate 212 along its thickness.

[0064] In some embodiments of this solution, the second end plate assembly 20 and the first end plate assembly 10 are respectively mounted at opposite ends of the fuel cell stack. In this case, the number and arrangement of the third openings 2011 on the second metal plate 211 are identical to the number and arrangement of the first openings 1011 on the first metal plate 111. That is, the projections of the third openings 2011 on the fuel cell stack coincide with the projections of the corresponding first openings 1011 on the fuel cell stack.

[0065] Furthermore, the number and arrangement of the fourth openings 2012 on the third insulating plate 212 are the same as the number and arrangement of the second openings 1012 on the second insulating plate 112. That is, the projection of the fourth openings 2012 on the stack coincides with the projection of the corresponding second openings on the stack.

[0066] Furthermore, the transparent manifold portion 22 includes a first section 221 and a second section 222 that are connected to each other. The cross-sectional area of ​​the first section 221 is smaller than that of the second section 222. The flow hole 2201 extends through the first section 221 and the second section 222. The first section 221 is disposed within the third opening 2011, and the second section 222 is located on a side of the second end plate component 21 away from the second flow collecting component 02. This configuration enables the transparent manifold portion 22 to block the second observation port 201.

[0067] Specifically, two second observation ports 201 are provided, and two transparent manifold portions 22 are provided, with one transparent manifold portion 22 being provided at each second observation port 201. Each transparent manifold portion 22 is provided with three flow holes 2201. The three flow holes 2201 on each transparent manifold portion 22 are connected to the corresponding three fourth openings 2012.

[0068] Furthermore, a second accommodating groove 2121 is provided on one side of the third insulating plate 212 close to the second metal plate 211, and an annular second accommodating groove 2121 is provided on the periphery of each fourth opening 2012. The second end plate assembly 20 also includes a second sealing portion, and a second sealing portion is provided in each second accommodating groove 2121. The second seal is provided corresponding to the end of the corresponding circulation hole 2201 to achieve sealed connection between the circulation hole 2201 and the corresponding fourth opening 2012.

[0069] like Figure 1As shown, an embodiment of the present invention further provides a fuel cell stack, which includes a core 03, the core 03 having a manifold channel 031, and the manifold channel 031 extending along the stacking direction of the core 03; a current collecting component is arranged at the end of the stacking direction of the core 03; the above-mentioned end plate assembly, the end plate assembly is arranged on the side of the current collecting component away from the core 03, and at least a part of the outline of the visual structure of the end plate assembly is arranged opposite to at least a part of the manifold channel 031, so that the water accumulation situation of the manifold channel 031 near the end plate assembly can be observed through the visual structure.

[0070] Specifically, the core 03 has a first direction X and a second direction Y that are perpendicular to each other on a horizontal plane, and a height direction Z. The core 03 includes a plurality of stacked battery cells, and the stacking direction of the battery cells is defined as the first direction.

[0071] The manifold channels 031 are arranged along the first direction of the core 03 and penetrate the core 03. There are two groups of manifold channels 031, and the two groups of manifold channels 031 are spaced apart along the second direction. Each group has three manifold channels 031, and the three manifold channels 031 in one group are spaced apart along the height direction.

[0072] Three of the manifold channels 031 are used for the inflow of anode gas, cathode gas and coolant, respectively, and the other three manifold channels 031 are used for the outflow of anode gas, cathode gas and coolant, respectively.

[0073] In some embodiments of the present solution, it can be arranged that three manifold channels 031 for supplying anode gas, cathode gas and coolant inflow are located on the same side, and another three manifold channels 031 for supplying anode gas, cathode gas and coolant outflow are located on the same side.

[0074] In other embodiments of the present scheme, it can be arranged that two manifold channels 031 for the inflow of anode gas, cathode gas and coolant and one manifold channel 031 for the outflow of anode gas, cathode gas and coolant are located on the same side; another manifold channel 031 for the inflow of anode gas, cathode gas and coolant and another two manifold channels 031 for the outflow of anode gas, cathode gas and coolant are located on the same side.

[0075] In an embodiment of this solution, the end plate assembly includes a first end plate assembly 10 and a second end plate assembly 20 , and the first end plate assembly 10 and the second end plate assembly 20 are respectively arranged at two ends of the fuel cell stack.

[0076] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0077] Unless otherwise specified, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0078] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0079] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0080] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0081] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An end plate assembly, characterized in that: The end plate assembly is used to be arranged on the outside of the current collecting component of the battery stack and is insulated from the current collecting component. The end plate assembly includes a visualization structure. In the extension direction of the manifold channel (031) of the battery stack, at least part of the outline of the visualization structure is arranged relative to at least part of the manifold channel (031), so that water accumulation at the end of the manifold channel (031) can be observed through the visualization structure.

2. The end plate assembly according to claim 1, wherein: The end plate assembly comprises a first end plate assembly (10), wherein the first end plate assembly (10) comprises: A first end plate component (11) is used to be arranged on the outside of the first current collecting component (01) of the battery stack, and a first observation port (101) is provided on the first end plate component (11). The first observation port (101) is provided through the first end plate component (11) in the thickness direction, and in the extension direction of the manifold channel (031) of the battery stack, at least a portion of the outline of the first observation port (101) is arranged opposite to at least a portion of the manifold channel (031); A first insulating plate (12) is arranged on a side of the first end plate component (11) close to the first current collecting component (01), and the first insulating plate (12) has a transparent area. Along the direction from the first end plate component (11) to the first insulating plate (12), the projection of the first observation port (101) is located within the transparent area, and the transparent area cooperates with the first observation port (101) to form the visualization structure.

3. The end plate assembly according to claim 2, wherein: Along the thickness direction of the first end plate component (11), the first observation port (101) includes a first opening (1011) and a second opening (1012) that are interconnected, the second opening (1012) is arranged close to the first insulating plate (12), at least one first opening (1011) is provided, the number of the second openings (1012) is greater than or equal to the number of the first openings (1011), the second openings (1012) are arranged corresponding to the manifold channel (031), and the outline of at least one second opening (1012) is located within the outline of one first opening (1011).

4. The end plate assembly according to claim 3, characterized in that The first end plate component (11) comprises: a first metal plate (111), wherein the first opening (1011) is provided on the first metal plate (111), and the first opening (1011) penetrates the first metal plate (111) along a thickness direction of the first metal plate (111); A second insulating plate (112), wherein the second opening (1012) is provided on the second insulating plate (112), and the second opening (1012) penetrates the second insulating plate (112) along a thickness direction of the second insulating plate (112).

5. The end plate assembly according to claim 2, wherein: A first sealing portion is provided on one side of the first insulating plate (12) close to the first current collecting component (01), and the first sealing portion is adapted to the contour of the end of the manifold channel (031).

6. The end plate assembly according to claim 1, wherein: The end plate assembly further comprises a second end plate assembly (20), wherein the second end plate assembly (20) comprises: A second end plate component (21) is used to be arranged outside the second current collecting component (02) of the battery stack, and a second observation port (201) is provided on the second end plate component (21), the second observation port (201) is provided through the second end plate component (21) in the thickness direction, and the second observation port (201) is arranged opposite to and communicates with an end of the manifold channel (031); A transparent manifold portion (22) is provided on the second end plate component (21) and blocks the second observation port (201). The transparent manifold portion (22) is made of a transparent material. A flow hole (2201) is provided on the transparent manifold portion (22). The flow hole (2201) passes through the transparent manifold portion (22). The flow hole (2201) is used for fluid circulation, and the flow hole (2201) is connected to the manifold channel (031).

7. The end plate assembly according to claim 6, wherein: Along the thickness direction of the second end plate component (21), the second observation port (201) includes a third opening (2011) and a fourth opening (2012) that are interconnected, the third opening (2011) is arranged close to the transparent manifold portion (22), at least one third opening (2011) is provided, the number of the fourth openings (2012) is greater than or equal to the number of the third openings (2011), the fourth openings (2012) are arranged corresponding to the manifold channel (031), and the outline of at least one fourth opening (2012) is located within the outline of one third opening (2011).

8. The end plate assembly according to claim 7, wherein: The second end plate component (21) comprises: a second metal plate (211), the third opening (2011) being provided on the second metal plate (211), the third opening (2011) penetrating the second metal plate (211) along a thickness direction of the second metal plate (211); A third insulating plate (212) is provided on a side of the second metal plate (211) close to the second current collecting component (02); the fourth opening (2012) is provided on the third insulating plate (212); and the fourth opening (2012) penetrates the third insulating plate (212) along a thickness direction of the third insulating plate (212).

9. The end plate assembly according to claim 7, wherein: The transparent manifold portion (22) includes a first section (221) and a second section (222) connected to each other, the cross-sectional area of ​​the first section (221) is smaller than the cross-sectional area of ​​the second section (222), the flow hole (2201) passes through the first section (221) and the second section (222), the first section (221) is arranged in the third opening (2011), and the second section (222) is located on the side of the second end plate component (21) away from the second collecting component (02).

10. A fuel cell stack, characterized in that: include: A core (03) having a manifold channel (031), wherein the manifold channel (031) extends along a stacking direction of the core (03); A current collecting component is provided at an end portion of the core (03) in the stacking direction; The end plate assembly according to any one of claims 1 to 9, wherein the end plate assembly is arranged on a side of the current collecting component away from the core (03), and at least a portion of the outline of the visualization structure of the end plate assembly is arranged opposite to at least a portion of the manifold channel (031), so that the water accumulation condition of the manifold channel (031) near the end plate assembly can be observed through the visualization structure.

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