CN210576218U

CN210576218U - Fuel cell bipolar plate and fuel cell stack packaging structure

Info

Publication number: CN210576218U
Application number: CN201920853882.4U
Authority: CN
Inventors: 程敏; 姜炜; 丁鹏; 初殿军; 韩冰峰; 邢丹敏
Original assignee: Sunrise Power Co Ltd
Current assignee: Sunrise Power Co Ltd
Priority date: 2019-06-06
Filing date: 2019-06-06
Publication date: 2020-05-19
Anticipated expiration: 2029-06-06

Abstract

The utility model provides a fuel cell bipolar plate and a packaging structure of a fuel cell stack, wherein the bipolar plate is provided with a positioning structure I formed by the edge sinking to the center of the bipolar plate; the packaging structure comprises a reactor core assembly adopting the fuel cell bipolar plate, and further comprises a packaging box body; the packaging box body comprises at least two open surfaces, and sealing structures are arranged on the open surfaces; the packaging box body also comprises a positioning structure II and a packaging plate; the number of the packaging plates is the same as that of the opening surfaces, and the packaging plates tightly press the sealing structure on the opening surfaces; the reactor core assembly is positioned inside the packaging box body; the positioning structure II is fixed on the inner side of the packaging box body and embedded into the positioning structure I positioned on the side surface of the reactor core assembly. The utility model provides a current packaging structure spare part quantity many, the galvanic pile receive vibration deformation inefficacy, sealed more or sealed face cross sealing effect poor technical problem.

Description

Fuel cell bipolar plate and fuel cell stack packaging structure

Technical Field

The utility model relates to a fuel cell encapsulation technical field particularly, especially relates to a fuel cell bipolar plate and fuel cell pile's packaging structure.

Background

The fuel cell is a clean energy technology for directly converting chemical energy into electric energy, has the advantages of high energy conversion efficiency, simple structure, low emission, low noise and the like, is commonly used for power systems of vehicles, ships and other vehicles, and can also be used as a mobile or fixed power station. A fuel cell stack, in which a plurality of bipolar plates and membrane electrodes are stacked one by a positioning tool, and the bipolar plates and the membrane electrodes are pressed to a set stack assembly force by a pressing device such as a press machine, and then fastened by a screw or a strapping tape or a pull plate, and after the positioning tool is removed, the fuel cell stack is obtained; the existing fuel cell mainly has three packaging structures:

1. the assembled electric pile and the fastening block are fastened in a packaging box body through screws to form a fuel cell module, the packaging structure has more parts and larger volume, and the fastening block is not easy to install;

2. the packaging structure is used as an assembly force bearing part of the fuel cell stack, the packaging structure becomes an integral part of the stack, and if the sealing surface is not designed reasonably, the requirement on the processing precision is high;

3. the end plates at two ends of the fuel cell stack are provided with fixing threaded holes or fixing structures for connecting with a packaging shell, namely the end plates are the end surfaces of the packaging, and the packaging structure has more parts and larger volume;

through the analysis, various problems exist in the current various electric pile packaging structures: in the process of assembling the galvanic pile, a tooling fixture needs to be positioned, and after the galvanic pile is assembled, the galvanic pile needs to be fastened with the packaging box body by an additional fastening structure, so that on one hand, the number of parts is large, the space between the box body and the galvanic pile is narrow, and the fastening structure of the galvanic pile is difficult to assemble; on the other hand, because the positioning structure of the galvanic pile is not fixedly connected with the packaging box body, the generated vibration causes the great amplitude of the positioning result of the galvanic pile in the running process of the vehicle, and the deformation and the failure of the galvanic pile are easily caused; secondly, the stack is integrally placed in a packaging box, and a manifold of the stack needs to penetrate through the packaging box, so that the sealing surface is increased, and the probability of sealing failure is increased; if adopt split type packaging structure, the space cross sealing problem that appears is indispensable.

For example, a cell stack fastening structure with external positioning function (publication No. CN106450372A, publication No. 20170222): with outer locating piece fastening at the side encapsulation board back, then fasten with the pile again, its not enough lies in: 1. the split type encapsulation can not realize sealing and can not reach the protection grade standard of the vehicle fuel cell; 2. the fastening direction of packaging plate and galvanic pile end plate is the normal direction of galvanic pile, and after the fastening, the assembly tolerance between locating piece and the galvanic pile body side is difficult to guarantee to can't realize the positioning action to the galvanic pile.

A high integration metal plate fuel cell stack (publication No. CN103633358A, publication No. 20140312): the split type electric pile packaging structure has the advantages that a side packaging plate plays a role in fastening an electric pile, and the split type electric pile packaging structure has the defects that the split type packaging structure cannot realize sealing, cannot reach the protection grade standard of an automotive fuel cell, and cannot ensure the assembly size deviation; on the other hand, the packaging structure is not provided with a positioning structure of the galvanic pile, so that the galvanic pile is easy to leak and fail due to waist collapse caused by vibration under the conditions of vehicle use or vibration.

A fuel cell module packaging and fixing structure (publication No. CN108206297A, publication No. 20180626): the utility model discloses a packaging box who holds the pile of compriseing two sets of end covers and third group side cap, its is not enough to lie in: 1. the contact surfaces between the two groups of end covers and the third group of side covers form T-shaped cross sealing surfaces, so that sealing is not easy to realize; 2. after the electric pile is assembled, the electric pile and the third side cover are fastened and assembled for the second time, so that the number of parts is increased, and the packaging volume is increased.

Patent fuel cell stack (publication No. CN104766982A, publication No. 20150708): disclosed is a stack package structure having the following sealing problems: 1. the compression rate of the sealing strip between the upper cover and the lower cover is not easy to guarantee; 2. the upper cover, the lower cover and the side cover are sealed by a ring surface, and the requirements on the dimensional accuracy of the upper cover, the lower cover and the side cover are extremely high to realize the sealing performance, so that the requirement is not preferable from the viewpoint of cost.

SUMMERY OF THE UTILITY MODEL

According to the technical problems that in the process of packaging the electric pile, the number of parts is large, the electric pile after being packaged is easy to deform and lose efficacy when being subjected to vibration, the sealing surface of the packaging structure is large or the cross sealing effect is poor in the prior art, and the fuel cell bipolar plate and the packaging structure of the fuel cell electric pile are provided. The utility model discloses mainly through making the fastening together between pile, location structure and the encapsulation box, reduced the spare part quantity of pile module, reduce pile packaging structure's volume, stable in structure is reliable, the equipment of being convenient for and the uniformity of guaranteeing the assembly.

The utility model discloses a technical means as follows:

a fuel cell bipolar plate comprises a cathode plate and an anode plate, wherein the bipolar plate is provided with a positioning structure I formed by the edge sinking towards the center of the bipolar plate.

Further, the shape of the positioning structure I is a rectangle, a triangle or an arc.

Further, the length and the width of the positioning structure I are both in the range of 0.5mm to 600 mm.

The utility model also provides a packaging structure of the fuel cell stack, which comprises a reactor core component adopting the fuel cell bipolar plate, and the packaging structure also comprises a packaging box body;

the packaging box body comprises at least two open surfaces, wherein the open surfaces are both provided with sealing structures, and at least one connecting rib or one surface of the packaging box body is arranged between the two open surfaces at intervals;

the packaging box body also comprises a positioning structure II and a packaging plate;

the number of the packaging plates is the same as that of the opening surfaces, and the packaging plates tightly press the sealing structure on the opening surfaces;

the reactor core assembly is positioned inside the packaging box body; the positioning structure II is fixed on the inner side of the packaging box body and embedded into the positioning structure I positioned on the side surface of the reactor core assembly.

further, the reactor core assembly is in a compressed state in the packaging box body, the height of the reactor core assembly is greater than that of the packaging box body when the reactor core assembly is not compressed, and the height difference is △ L;

the package plate comprises a gas port end plate;

the open surface comprises a surface opposite to a gas port on the core assembly, and the gas port end plate is tightly pressed on the open surface;

the positioning structure II comprises a fixed positioning block and a sliding positioning block;

the fixed positioning block is fixed on the inner side of the packaging box body and is opposite to the positioning structure I on the side surface of the reactor core assembly;

the fixed positioning block is provided with an embedding space for accommodating the sliding positioning block;

one end of the sliding positioning block is fixed on the air port end plate, and the other end of the sliding positioning block is embedded into the embedding space;

the sliding positioning blocks and the corresponding fixed positioning blocks are embedded in the positioning structures I on the side faces of the reactor core assembly.

Further, the packaging structure also comprises a gas port end plate positioning block used for positioning the gas port end plate in the packaging process;

the gas port end plate positioning block is fixed on the outer side of the packaging box body and is provided with a positioning space matched with the profile of the edge of the gas port end plate.

Furthermore, the gas port end plate positioning block is fixed on the outer side of the edge of the packaging box body, and the edge is an edge between any two adjacent surfaces of the packaging box body adjacent to the surface where the gas port end plate is located;

one end of the air port end plate positioning block extends out of the packaging box body along the edge, the positioning space is arranged on the extending part, and the length of the extending part is larger than △ L.

Further, the section of the protruding part is rectangular, L-shaped, triangular or circular arc-shaped.

Further, the surface profile of the fixed positioning block is matched with the shape of the positioning structure I, and the thickness of the fixed positioning block is larger than the height of the positioning structure I.

further, the surface profile of the sliding positioning block is matched with the shape of the positioning structure I, and the length of the sliding positioning block is larger than △ L.

Furthermore, the parts of the fixed positioning block and the sliding positioning block, which are in contact with the reactor core assembly, are subjected to insulation treatment.

Further, the surface of the fixed positioning block, which is in contact with the core assembly, is provided with a groove for guiding airflow to purge the surface of the core assembly.

Further, the inner surface of the packaging box body is provided with a hydrophobic coating.

Further, the seal structure is constituted by a seal groove and a seal element.

Furthermore, a drainage structure is arranged in the packaging box body, and the drainage structure comprises a drainage slope, a drainage groove and a drainage port;

an inclined drainage slope is arranged on the inner surface of the packaging box body;

the inner surface of the packaging box body is provided with the inclined drainage groove along the edge of the drainage slope;

the drain outlet is arranged on the packaging box body and opposite to the lowest point of the drain groove;

the packaging box body also comprises an air outlet.

Further, the slope of the drainage slope and the slope of the drainage groove are 0.1% -20%.

Further, the packaging structure further comprises an elastic compensation structure; the elastic compensation structure comprises an elastic element and a floating plate; one end of the elastic element is connected to the inner surface of the packaging box body, and the other end of the elastic element is connected to the floating plate; the float plate is in contact with the core stack assembly.

Compared with the prior art, the utility model has the advantages of it is following:

1. the utility model provides a fuel cell bipolar plate and fuel cell pile's packaging structure through fastening location structure II and encapsulation box, improves location structure's reliability, simultaneously, has reduced the location frock that needs when the pile equipment.

2. The utility model provides a fuel cell galvanic pile packaging structure, the packaging box body takes into account the fastening structure of the galvanic pile, on one hand, the number of parts of the fastening structure is reduced, and the module volume is reduced; on the other hand, the size precision of the packaging box body is easy to guarantee, so that the size precision of the galvanic pile is guaranteed, the assembly is convenient, and the consistency of the galvanic pile is improved.

3. The utility model provides a fuel cell bipolar plate and packaging structure of fuel cell pile through set up location structure I on the bipolar plate to set up the location structure II that can gomphosis with it, location structure II can restrict the degree of freedom of four directions of reactor core subassembly simultaneously, compares in prior art, can reduce the locating piece quantity of fixed pile to 4 and below from 6; the quantity of the positioning blocks is reduced, so that the space interference between the parts in the packaging box body is greatly reduced, and the assembly is facilitated.

4. The utility model provides a packaging structure of fuel cell bipolar plate and fuel cell pile realizes overall sealing between reactor core subassembly and the encapsulation box, reaches the protection level standard IP67 of automobile-used fuel cell pile.

5. The utility model provides a packaging structure of fuel cell pile, the drainage structural design in the packaging box makes the difficult ponding of overall structure, does benefit to and improves insulating properties.

To sum up, use the technical scheme of the utility model through make between pile, location structure and the encapsulation box fastening together, reduced the spare part quantity of pile module, reduced pile packaging structure's volume, stable in structure is reliable, the uniformity of the equipment of being convenient for and guaranteeing the assembly. Therefore, the technical scheme of the utility model solved prior art and to the pile packaging process, have that spare part quantity is more, the pile meets the vibration and easily leads to warping more or the cross seal effect subalternation technical problem of inefficacy, packaging structure's sealed face after the encapsulation.

Based on the reason, the utility model discloses can extensively promote in fields such as fuel cell encapsulation.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a schematic structural view of a bipolar plate and a positioning structure II of a fuel cell according to the present invention.

Fig. 2 is a schematic diagram of a packaging structure of a fuel cell stack according to the present invention.

Fig. 3 is an assembly diagram of the packaging structure of the fuel cell stack according to the present invention.

Fig. 4 is a schematic diagram of the packaging structure of the fuel cell stack according to the present invention after assembly.

3 fig. 35 3 is 3 a 3 sectional 3 view 3 taken 3 along 3 the 3 line 3 a 3- 3 a 3 in 3 fig. 35 3. 3

Fig. 6 is a cross-sectional view taken along the line B-B in fig. 5.

Fig. 7 is a schematic view of the drainage structure of the present invention.

Fig. 8 is a schematic view of the drainage structure of the present invention.

Fig. 9 is a schematic view of the structure of the upper cover of the present invention.

Fig. 10 is a cross-sectional view taken along the line C-C in fig. 9.

In the figure: 1. a fuel cell bipolar plate; 11. a positioning structure I; 2. a core assembly; 3. packaging the box body; 31. a positioning structure II; 32. a gas port end plate; 311. fixing a positioning block; 312. sliding a positioning block; 33. draining a water slope; 34. a water discharge tank; 35. a water outlet; 37. an upper cover; 38. a gas port end plate positioning block; 4. an elastic element; 5. and (4) floating the plate.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element in question must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and if not stated otherwise, the terms have no special meaning, and therefore, the scope of the present invention should not be construed as being limited.

Example 1

As shown in fig. 1, the present invention provides a fuel cell bipolar plate 1, which comprises a cathode plate and an anode plate, wherein the bipolar plate 1 is provided with a positioning structure I11 formed by the edge sinking towards the center of the bipolar plate.

Further, the shape of the positioning structure I11 is rectangular, triangular or circular arc.

Further, the length and the width of the positioning structure I11 range from 0.5mm to 600 mm.

Example 2

As shown in fig. 2 to 10, the present invention further provides a fuel cell stack packaging structure, including a core assembly 2 using the fuel cell bipolar 1 of embodiment 1, where the core assembly 2 further includes an MEA and a current collecting plate; the packaging structure also comprises a packaging box body 3; the packaging box body 3 comprises at least two open surfaces, wherein the open surfaces are both provided with sealing structures, and at least one connecting rib or one surface of the packaging box body 3 is arranged between the two open surfaces at intervals; the packaging box body 3 further comprises a positioning structure II31 and a packaging plate; the number of the packaging plates is the same as that of the open surfaces, and the packaging plates tightly press the sealing structure on the open surfaces, so that all surfaces of the packaging box body 3 are not crossed, a crossed sealing surface is not generated, and the whole sealing effect is better; the core assembly 2 is positioned inside the enclosure box 3; the positioning structure II31 is fixed inside the packing box 3 and embedded in the positioning structure I11 positioned on the side surface of the core assembly 2;

through set up in the encapsulation box can with the location structure II of location structure I gomphosis, location structure II can restrict the degree of freedom of reactor core subassembly in four directions in the plane simultaneously, the locating piece that uses among the prior art can only restrict an ascending degree of freedom usually, consequently packaging structure can reduce the quantity that is used for the locating piece of fixed reactor core subassembly, the reduction of locating piece quantity for space interference between the inside spare part of encapsulation box is less greatly, does benefit to the assembly.

furthermore, the reactor core component 2 is in a compressed state in the packaging box body 3, the height of the reactor core component is larger than that of the packaging box body when the reactor core component is not compressed, and the height difference is △ L, the packaging plate comprises a gas port end plate 32, the open surface comprises a surface opposite to a gas port on the reactor core component 2, and the gas port end plate 32 is tightly pressed on the open surface, the positioning structure II31 comprises a fixed positioning block 311 and a sliding positioning block 312, the fixed positioning block 311 is fixed on the inner side of the packaging box body 3 and is opposite to the positioning structure I11 on the side surface of the reactor core component 2, the fixed positioning block 311 is provided with an embedding space for accommodating the sliding positioning block 312, one end of the sliding positioning block 312 is fixed on the gas port end plate 32, and the other end of the sliding positioning block 312 is embedded in the embedding space, and the sliding positioning block 312 and the corresponding fixed positioning block 311 are both embedded in the positioning;

in the process of compressing the reactor core assembly through the gas port end plate, the sliding positioning block is used for positioning the reactor core assembly higher than the packaging box body part, and in the process, the sliding positioning block is embedded into the embedding space and also embedded into the positioning structure I, so that the reactor core assembly is further fastened.

Further, the packaging structure further includes a gas port end plate positioning block 33 for positioning the gas port end plate 32 during the packaging process; the gas port end plate positioning block 33 is fixed on the outer side of the packaging box body 3, and is provided with a positioning space matched with the edge profile of the gas port end plate 32.

furthermore, the gas port end plate positioning block 33 is fixed on the outer side of the edge of the packaging box body 3, the edge is the edge between any two adjacent surfaces of the packaging box body adjacent to the surface where the gas port end plate 32 is located, one end of the gas port end plate 32 positioning block extends out of the packaging box body 3 along the edge, the positioning space is arranged on the extending part, and the length of the extending part is greater than △ L.

The gas port end plate compresses the reactor core assembly and needs to be pressed on a corresponding open surface, and in the process, the gas port end plate fixing block is used for positioning the gas port end plate.

Further, the surface contour of the fixed positioning block 311 matches the shape of the positioning structure I11, and the thickness of the fixed positioning block 311 is greater than the height of the positioning structure I11, so as to ensure that the core assembly 2 does not contact the inner wall of the enclosure 3 except for the positioning structure II 31.

further, the surface profile of the slide positioning block 312 matches the shape of the positioning structure I11, and the length is greater than △ L.

Further, the portions of the fixed positioning block 311 and the slide positioning block 312 that are in contact with the core assembly 2 are both subjected to insulation treatment.

Further, a groove 3111 for guiding the air flow to purge the surface of the core assembly 2 is provided on the surface of the fixed positioning block 311 in contact with the core assembly 2, so that water accumulation on the surface of the core assembly 2 can be prevented.

Further, the inner surface of the packaging box body 3 is provided with a hydrophobic coating.

Further, the seal structure is constituted by a seal groove and a seal element.

Preferably, the sealing element is a sealing bead or a sealing gasket.

Furthermore, a drainage structure is arranged inside the packaging box body 3, and the drainage structure comprises a drainage slope 33, a drainage groove 34 and a drainage port 35; the inner surface of the packaging box body 3 is provided with the inclined drainage slope 33; the inner surface of the packaging box body 3 is provided with the inclined drainage groove 34 along the edge of the drainage slope 33; the drain port 35 is provided at a position opposite to the lowest point of the drain groove 34 on the package case 3; the packaging box body 3 also comprises an exhaust port; two adjacent drainage grooves 34 are communicated; water drops generated on the inner wall of the packaging box body 3 can flow into the drainage groove 34 along the drainage slope 33 and then are drained out of the packaging box body 3 through the drainage port 35, so that water is prevented from accumulating inside; by arranging the exhaust port, hydrogen with low density can be gathered in the highest point area in the package and exhausted in a purging mode.

Further, the slope i of the drainage slope 33 and the drainage groove 34 is 0.1% -20%.

Further, the packaging structure further comprises an elastic compensation structure; the elastic compensation structure comprises an elastic element 4 and a floating plate 5; one end of the elastic element 4 is connected to the inner surface of the packaging box body 3, and the other end of the elastic element is connected to the floating plate 5; the floating plate 5 is in contact with the core stack assembly 2; the elastic compensation structure is used for compensating the size difference between the package body 3 and the core assembly 2, so that the core assembly 2 can be better fastened inside the package body 3.

Adopt when packaging structure encapsulate, will assemble the reactor core subassembly warp open face on the packaging box is put into inside the packaging box, then will location structure II imbeds the reactor core subassembly side in the location structure I, will simultaneously location structure II is fixed in the packaging box is inboard, through the compression of gas port end plate the reactor core subassembly, until the gas port end plate passes through seal structure and corresponding open face fastening, compresses tightly respective end plate through seal structure on other open faces at last, accomplishes the overall seal of packaging box.

Example 3

On the basis of the embodiment 2, in the present embodiment, the positioning structures I11 on the fuel cell bipolar plate 1 in the core assembly 2 are respectively located on two long sides, and the enclosure 3 includes three open surfaces, namely two surfaces opposite to the gas ports on the core assembly 2 and a top surface;

the elastic compensation structure is arranged on a packaging plate opposite to the air port end plate 33 on the packaging box body 3, one end of the elastic element 4 is connected to the inner surface of the packaging plate, the other end of the elastic element is connected to the floating plate 5, and the floating plate 5 is in contact with the reactor core assembly 2; when the core assembly 2 is placed inside through the open face of the containment tank 3, the elastic compensation structure is also compressed when the core assembly 2 is compressed by the gas port end plate 33, so that the core assembly is better fastened inside the containment tank 3;

the top surface is a surface opposite to the positioning structure I11 on the side surface of the core assembly 2; the surface of the packaging box body 3 opposite to the top surface is a bottom surface; the top surface and the bottom surface of the packaging box body 3 are respectively provided with the positioning structures II 31; in the positioning structure II31 located on the bottom surface of the enclosure box 3, the fixed positioning block 311 is fixed on the bottom surface of the enclosure box 3 and embedded in the positioning structure I11 on one side of the core assembly 2; in the positioning structure II31 located on the top surface of the package box 3, two ends of the fixed positioning block 311 are respectively fixed to two connecting ribs on the top surface and are pressed against the inside of the core assembly 2 by the positioning structure I11 embedded in the other side of the core assembly 2.

Further, as shown in fig. 8, the drainage structures are provided on the bottom surfaces, the drainage slopes 33 provided on the bottom surfaces are inclined from the right side to the left side, the drainage grooves 34 provided on the slope bottoms of the drainage slopes 33 are longitudinal drainage grooves, and the drainage grooves 34 provided on both sides of the drainage slopes 33 are transverse drainage grooves; the drain slope 33 provided on the bottom surface avoids the position of the fixed positioning block 311, that is, the upper surface of the fixed positioning block 311 does not incline along with the drain slope 33.

Further, in the drainage structure provided on the bottom surface, the drainage grooves 34 located on the bottom of the drainage slope 33 are inclined from the middle to both ends.

Further, as shown in fig. 9 to 10, the end plate pressed against the top surface is an upper cover 39;

the inner surface of the upper cover 39 is provided with the drainage slope 33;

the drain slope 33 provided on the inner surface of the upper cover 39 is inclined toward the center along the outer edge of the inner surface of the upper cover 39 such that the thickness of the upper cover 39 is gradually reduced from the outer edge toward the center, and the outer edge of the drain slope 33 is positioned directly above the lateral drain groove provided on the bottom surface and avoids directly above the core assembly 2; so that the condensed water flows to the edge of the upper cover under the action of gravity and then falls into the drainage groove on the bottom surface;

the highest point of the inner surface of the upper cover 39 is provided with an exhaust port, so that hydrogen with lower density is gathered in the highest point area in the package and is exhausted by means of purging.

Further, the slope i of the drainage slope 33 provided on the inner surface of the upper cover 39 is 0.1% to 10%, and the slopes i of the drainage slope 33 and the drainage groove 34 provided on the bottom surface are 0.1% to 20%.

The utility model provides a fuel cell bipolar plate and fuel cell electric pile packaging structure, after utilizing location structure and packaging box body fastening connection, as the whole outer positioning frock of reactor core subassembly, realize whole sealed, the sealed face is simple reliable, reaches higher protection level; the reactor core assembly, the positioning structure and the packaging box body are fastened together, so that the number of parts of the electric pile module is reduced, the size of the electric pile packaging structure is reduced, the structure is stable and reliable, and the assembly consistency are convenient to realize.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. A fuel cell bipolar plate comprises a cathode plate and an anode plate, and is characterized in that the bipolar plate is provided with a positioning structure I formed by recessing the edge of the bipolar plate to the center of the bipolar plate.

2. The fuel cell bipolar plate of claim 1, wherein the positioning structure I has a rectangular, triangular or circular arc shape.

3. The fuel cell bipolar plate of claim 1, wherein the locating structure I has a length and a width both ranging from 0.5mm to 600 mm.

4. An encapsulation structure of a fuel cell stack comprising a core assembly using the fuel cell bipolar plate of any one of claims 1 to 3, wherein the encapsulation structure further comprises an encapsulation case;

5. The packaging structure of a fuel cell stack according to claim 4,

the reactor core assembly is in a compressed state in the packaging box body, the height of the reactor core assembly is greater than that of the packaging box body when the reactor core assembly is not compressed, and the height difference is △ L;

the package plate comprises a gas port end plate;

6. The packaging structure of a fuel cell stack according to claim 5,

the packaging structure also comprises a gas port end plate positioning block for positioning the gas port end plate in the packaging process;

7. The packaging structure of a fuel cell stack according to claim 6,

the gas port end plate positioning block is fixed on the outer side of the edge of the packaging box body, and the edge is the edge between any two adjacent surfaces of the packaging box body adjacent to the surface where the gas port end plate is located;

8. The fuel cell stack package structure according to claim 7, wherein the protruding portion has a rectangular, L-shaped, triangular, or circular arc-shaped cross section.

9. The packaging structure of fuel cell stack according to claim 5, wherein the surface profile of the fixed positioning block matches the shape of the positioning structure I, and the thickness of the fixed positioning block is greater than the height of the positioning structure I.

10. the fuel cell stack package structure of claim 5, wherein the surface profile of the sliding positioning block matches the shape of the positioning structure I and has a length greater than △ L.

11. The fuel cell stack packaging structure according to claim 5, wherein portions of the fixed positioning block and the slide positioning block, which are in contact with the core assembly, are insulated.

12. The fuel cell stack package structure of claim 5, wherein the surface of the fixed positioning block contacting the core assembly is provided with a groove for guiding the air flow to purge the surface of the core assembly.

13. The fuel cell stack encapsulation structure according to claim 4, wherein an inner surface of the encapsulation case has a hydrophobic coating.

14. The fuel cell stack package structure according to claim 4, wherein the seal structure is constituted by a seal groove and a seal member.

15. The packaging structure of a fuel cell stack according to claim 5,

a drainage structure is arranged in the packaging box body, and comprises a drainage slope, a drainage groove and a drainage outlet;

the packaging box body also comprises an air outlet.

16. The fuel cell stack package structure according to claim 15, wherein the slope of the drain slope and the drain groove is 0.1% to 20%.

17. The packaging structure of a fuel cell stack according to claim 5, characterized in that the packaging structure further comprises an elasticity compensation structure; the elastic compensation structure comprises an elastic element and a floating plate; one end of the elastic element is connected to the inner surface of the packaging box body, and the other end of the elastic element is connected to the floating plate; the float plate is in contact with the core stack assembly.