CN218867170U

CN218867170U - Electric pile packaging structure and fuel cell

Info

Publication number: CN218867170U
Application number: CN202221622882.1U
Authority: CN
Inventors: 巩建坡; 徐兴豪; 王芳芳; 任士桐; 刘勇志; 陈温国
Original assignee: Weichai Balade Hydrogen Technology Co ltd
Current assignee: Weichai Balade Hydrogen Technology Co ltd
Priority date: 2022-06-27
Filing date: 2022-06-27
Publication date: 2023-04-14
Anticipated expiration: 2032-06-27

Abstract

The utility model relates to a fuel cell technical field especially relates to a galvanic pile packaging structure and fuel cell. The electric pile packaging structure comprises an elastic connecting component and two end plates, wherein the two end plates are respectively positioned at two ends of the electric pile; the elastic connection assembly is connected with the two end plates and located on two sides of the galvanic pile, the elastic connection assembly comprises an elastic structure and a length adjustment structure, a first end of the elastic structure is connected with one of the end plates, a second end of the elastic structure is connected with a first end of the length adjustment structure, and a second end of the length adjustment structure is connected with the other end plate. Therefore, the pressure of the galvanic pile under different working conditions can be effectively ensured to be uniform and stably regulated, and the reliability and stability of the performance of the galvanic pile are ensured. The setting of length adjustment structure then can prevent that the end plate displacement from moving down and cause elastic construction can not effectual compression, through the length adjustment to the length adjustment structure, then can guarantee that the pulling force that the elastic connection subassembly of pile both sides received is even and stable.

Description

Electric pile packaging structure and fuel cell

Technical Field

The utility model relates to a fuel cell technical field especially relates to a galvanic pile packaging structure.

Background

The bipolar plate and the membrane electrode are important components in the fuel cell stack, the bipolar plate is used for distributing fuel, conducting electricity and supporting the membrane electrode, the membrane electrode is a place where electrochemical reaction occurs, and the bipolar plate and the membrane electrode are stacked and connected in series to form the fuel cell stack. In order to make the fuel cell have the contact resistance as small as possible, a certain acting force must be applied to compress the gas diffusion layer, the thermal expansion and cold contraction of each component in the fuel cell stack can be caused by large temperature difference of the fuel cell stack in the operation process, particularly the start-up and shutdown processes, and the thermal expansion and cold contraction of the material can finally change the pressing force of the stack, so that the packaging structure or the stack is influenced by stress, and the deformation can cause the air tightness and basic performance of the stack to change and influence the performance of the stack.

Therefore, a stack package structure is needed to solve the above-mentioned technical problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a galvanic pile packaging structure and fuel cell can carry out length adjustment according to the change of the packing force of galvanic pile.

To achieve the purpose, the utility model adopts the following technical proposal:

a stack packaging structure for packaging a stack of fuel cells, comprising:

the two end plates are respectively positioned at two ends of the electric pile;

elastic connection subassembly connects two the end plate, just elastic connection subassembly is located the both sides of pile, elastic connection subassembly includes elastic construction and length adjustment structure, the first end of elastic construction with one of them the end plate is connected, the second end of elastic construction with the first end of length adjustment structure is connected, the second end and the other of length adjustment structure the end plate is connected.

As an optimal technical scheme of the above-mentioned pile packaging structure, the elastic structure includes a housing and an elastic member, the housing is formed with a cavity for accommodating the elastic member, the elastic member is disposed in the cavity, a first end of the elastic member and the housing are both connected with the end plate, and a second end of the elastic member is connected with the length adjustment structure.

As a preferable technical solution of the above stack package structure, the elastic member is connected to the end plate by a first bolt.

As a preferable technical solution of the above pile package structure, the first bolt is provided with a connection hole connected with the elastic member, a part of the elastic member passes through the connection hole, and the first bolt is in threaded connection with the casing.

As a preferable technical solution of the above-mentioned stack packaging structure, the elastic member is a spring.

As a preferred technical solution of the above-mentioned electric pile packaging structure, the casing is provided with scale marks for determining the deformation length of the elastic member, and the scale marks are arranged in a row along the height direction of the electric pile.

As a preferred technical solution of the above-mentioned stack packaging structure, the length adjustment structure includes a threaded sleeve and a second bolt, a first end of the threaded sleeve is connected with the elastic structure, and a second end of the threaded sleeve is in threaded connection with the end plate through the second bolt.

As an optimal technical scheme of the above-mentioned pile packaging structure, the length adjustment structure further comprises a hook bolt, a first end of the hook bolt is connected with the elastic structure, a second end of the hook bolt is in threaded connection with a first end of the threaded sleeve, and the first end and the second end of the threaded sleeve are respectively provided with internal threads with opposite rotation directions.

As a preferred technical solution of the above-mentioned stack packaging structure, the end plate is provided with a lightening hole.

A fuel cell comprising the stack packaging structure according to any one of the above aspects.

The utility model discloses beneficial effect:

can direct action in the end plate when the inside expend with heat and contract with cold of pile, make the end plate rise or descend, the end plate is connected with elastic construction, no matter the end plate rises or descends like this, all can direct action on elastic construction, make elastic construction produce the deformation, in order to adapt to the condition that the end plate should receive the effect of pile and rise or descend, elastic construction can be effectual the pull force of assurance pile during operation in the axial direction, so can effectually guarantee the even and stable regulation of pressure of pile under different operating mode conditions, guarantee the reliable stability of pile performance. The setting of length adjustment structure then can prevent that the end plate displacement from moving down the transition and cause elastic construction can not effectual compression, through the length adjustment to the length adjustment structure, then can guarantee that the pulling force that the elastic connection subassembly of pile both sides received is even and stable.

The elastic connecting assembly is located on two sides of the electric pile, namely the elastic connecting assembly is arranged in a side-arranged mode, so that the height and the volume which are required to be increased due to the fact that the elastic structure is added above the end plate are reduced, the weight of the electric pile is reduced, the difficulty of the fuel cell engine when the electric pile is arranged is reduced, and the technical indexes such as the volume power density, the mass power density and the like of the engine are increased.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

Fig. 1 is a front view of a stack package structure provided by an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

fig. 3 is a schematic structural diagram of a stack packaging structure provided by an embodiment of the present invention.

In the figure:

1. an end plate; 11. lightening holes; 2. a housing; 21. scale marks; 3. an elastic member; 4. a first bolt; 5. a threaded sleeve; 6. a second bolt; 7. a hook bolt; 8. and (4) electric pile.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The electric pile is formed by repeatedly stacking bipolar plates and MEA (membrane electrode assembly), the end plates are contacted with the current collecting plates at the lowermost layer and the uppermost layer of the electric pile, the current collecting plates are in pressure joint with the unipolar plate without a flow channel at one side, and the electric pile and the end plates are sealed in a common flow channel area through special sealing rings.

In the operation process of the existing fuel cell, due to the fact that the temperature difference between the starting process and the stopping process is large, expansion caused by heat and contraction caused by cold of all parts in the fuel cell can be caused, the expansion caused by heat and the contraction caused by cold of materials can cause the change of the pressing force of the galvanic pile, and therefore the change of the pressing force can cause the change of the airtightness and basic performance of the galvanic pile, and the performance of the galvanic pile is influenced.

To this end, the present embodiment provides a stack packaging structure for packaging a stack of a fuel cell to solve the above-mentioned problems.

As shown in fig. 1 and 2, the stack packaging structure includes an elastic connection assembly and two end plates 1, wherein the two end plates 1 are respectively located at two ends of a stack 8; elastic connection subassembly connects two end plates 1, and elastic connection subassembly is located the both sides of pile 8, and elastic connection subassembly includes elastic construction and length adjustment structure, and the first end of elastic construction is connected with one of them end plate 1, and the second end of elastic construction is connected with the first end of length adjustment structure, and the second end of length adjustment structure is connected with another end plate 1.

Because end plate 1 plays the effect that compresses tightly and insulating, consequently have higher requirement to end plate 1 insulating properties and intensity, adopt levelness and the unanimous end plate 1 of intensity in the both sides of galvanic pile 8, can effectively guarantee that galvanic pile 8 is even in the planar atress of whole end plate 1 when the atress, can effectively prevent the drunkenness of plane direction through the locating hole of end plate 1.

Can direct action in end plate 1 when 8 inside expend with heat and contract with cold of pile, make end plate 1 rise or descend, end plate 1 is connected with elastic construction, no matter end plate 1 rises or descends like this, all can direct action on elastic construction, make elastic construction produce and warp, with the condition that adaptation end plate 1 should rise or descend by the effect of pile, elastic construction can be effectual assurance pile 8 at the ascending pulling force of axial direction of during operation, so can be effectual the even and stable regulation of pressure of assurance pile 8 under different operating mode conditions, guarantee the reliable and stable of pile 8 performance. The setting of length adjustment structure then can prevent that end plate 1 displacement from moving down the transition and cause elastic construction can not effectual compression, through the length adjustment to the length adjustment structure, then can guarantee that the tensile force that the elastic connection subassembly of 8 both sides of galvanic pile received is even and stable.

The elastic connecting components are located on two sides of the electric pile 8, namely the elastic connecting components are arranged in a side-arranged mode, so that the height and the volume which are required to be increased due to the fact that the elastic structure is added above the end plate 1 are reduced, the weight of the electric pile is reduced, the difficulty of the fuel cell engine in arranging the electric pile is reduced, and the technical indexes such as the volume power density, the mass power density and the like of the engine are increased.

Further, the elastic structure includes casing 2 and elastic component 3, and casing 2 is formed with the cavity that holds elastic component 3, and elastic component 3 sets up in the cavity, and casing 2 prevents elastic component 3 in the deformation of this elastic component 3 non-axial direction for the direction that elastic component 3 provided, so can effectively prevent that elastic component 3 from receiving great non-axial direction's power and the condition of failing takes place. The first end of elastic component 3 and casing 2 all are connected with end plate 1, and the second end and the length adjustment structure of elastic component 3 are connected. When the end plate 1 applies an outward force on the internal structure of the stack 8, the elastic member 3 can act simultaneously with the end plate 1 due to the elastic force, and is not affected.

To achieve the connection with the end plate 1, the elastic member 3 is optionally connected with the end plate 1 by a first bolt 4. First bolt 4 one end is passed end plate 1 back and is connected with elastic component 3, and the power direct action that end plate 1 received gives first bolt 4 like this, and first bolt 4 pulling elastic component 3 produces elastic deformation, compares in end plate 1 and spring lug connection, and first bolt 4 still plays the purpose of the transmission effort when realizing end plate 1 and spring coupling, and first bolt 4 also can not receive 8 internal forces of galvanic pile influence and warp.

Specifically, the first bolt 4 is provided with a connection hole connected with the elastic member 3, the elastic member 3 partially passes through the connection hole, and the first bolt 4 is threadedly connected with the housing 2. The threaded connection of the first bolt 4 to the housing 2 in effect provides support for the housing 2 so that the housing 2 does not limit the specific configuration of the resilient member 3.

When the lengths of the elastic connecting components are different after the elastic connecting components are arranged on the two sides of the electric pile 8, the tensile force applied to the end plate 1 is different. For this purpose, the lower part of the housing 2 is provided with a plurality of scale marks 21 arranged in a row and used for determining the deformation length of the elastic element 3, the position where the length adjusting structure is connected with the elastic element 3 can be regarded as the original point, the length adjusting structure is partially positioned in a cavity formed by the housing 2, and the lengths of different elastic elements 3 are adjusted according to the length adjustment of the length adjusting structure, so that the tensile force applied to the elastic connecting assembly can be the same. Set up scale mark 21 and can make the effectual regulation of length of elastic connection assembly receive the pulling force, can mark according to the technological requirement of actual assembly in advance through the pulling force device earlier, mark the confirmation that carries out on-the-spot concrete elastic component 3 tensile length through the scale mark 21 that sets up on casing 2 after accomplishing, can guarantee the tensile uniformity of length adjustment structure through the regulation of length.

Preferably, the elastic member 3 is a spring. One end of the spring is connected with the first bolt 4, and the other end of the spring is connected with the length adjusting structure. The both ends of spring are provided with coupling hook respectively, and the coupling hook that the one end of spring set up passes the connecting hole and realizes being connected of spring and first bolt 4. The connecting hook that the other end of spring set up is connected with length adjustment structure. So can be convenient for elastic component 3 respectively with first bolt 4 and length adjustment structure's connection, improve assembly efficiency.

The length adjustment structure includes swivel nut 5 and second bolt 6, and the first end and the elastic construction of swivel nut 5 are connected, and the second end and the end plate 1 of swivel nut 5 pass through second bolt 6 threaded connection. The length of the length adjustment structure can be adjusted by screwing the second bolt 6. However, screwing the second bolt 6 requires an operation at the end plate 1, and screwing the second bolt 6 becomes practically difficult when the end plate 1 is shielded.

To this end, in some embodiments, the length adjustment structure further comprises a hook bolt 7, a first end of the hook bolt 7 being connected with the resilient structure, i.e. a hook end of the hook bolt 7 is connected with the resilient structure, in particular a hook end of the hook bolt 7 is connected with the connection hook of the spring. The second end of the hook bolt 7 is in threaded connection with the first end of the threaded sleeve 5, and the first end and the second end of the threaded sleeve 5 are respectively provided with internal threads with opposite turning directions. It can be understood that the external screw thread that hook bolt 7 set up is opposite with the soon of the external screw thread that second bolt 6 set up, when needs adjust the length adjustment structure, directly revolves to twist swivel nut 5 and can realize the length adjustment's to the length adjustment structure purpose, so be convenient for adjust the length of length adjustment structure, can not drive the elastic component 3 rotatory and cause the elastic component 3 to twist reverse the inefficacy at the rotatory in-process of length adjustment structure simultaneously.

It should be noted that, the case that the elastic structure cannot be effectively compressed due to the downward movement transition of the end plate 1 actually refers to the case that the stack 8 and the end plate 1 are crushed or failed in the common flow channel area through a dedicated seal ring.

In order to improve the stability of being connected between end plate 1 and the pile 8, elastic connection assembly is the multiunit, and multiunit elastic connection assembly evenly arranges in the both sides of pile 8. For example, as shown in fig. 3, three sets of elastic connection assemblies are disposed on each side of the stack 8, the three sets of elastic connection assemblies are uniformly and alternately arranged, and corresponding to the elastic connection assemblies, six first bolts 4 are disposed on one end plate 1, and six second bolts 6 are disposed on the other end plate 1.

In order to reduce the weight of the end plate 1, the end plate 1 is provided with a plurality of lightening holes 11.

The embodiment also provides a fuel cell, including the utility model discloses an embodiment provides a galvanic pile packaging structure.

Because of including the above-mentioned galvanic pile packaging structure, the fuel cell of the embodiment of the present invention has all the advantages and benefits of the above-mentioned embodiments, and the description thereof is omitted here.

In addition, the foregoing is only the preferred embodiment of the present invention and the technical principles applied thereto. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims

1. A stack packaging structure for packaging a stack (8) of fuel cells, comprising:

the two end plates (1) are respectively positioned at two ends of the electric pile (8);

elastic connection subassembly connects two end plate (1), just elastic connection subassembly is located the both sides of pile (8), elastic connection subassembly includes elastic construction and length adjustment structure, the first end of elastic construction with one of them end plate (1) is connected, the second end of elastic construction with the first end of length adjustment structure is connected, the second end and the other one of length adjustment structure end plate (1) is connected.

2. The stack encapsulation structure according to claim 1, characterized in that the elastic structure comprises a housing (2) and an elastic member (3), the housing (2) forms a cavity for accommodating the elastic member (3), the elastic member (3) is disposed in the cavity, a first end of the elastic member (3) and the housing (2) are both connected with the end plate (1), and a second end of the elastic member (3) is connected with the length adjustment structure.

3. The stack encapsulation structure according to claim 2, characterized in that the elastic member (3) is connected to the end plate (1) by a first bolt (4).

4. The stack encapsulation structure according to claim 3, wherein the first bolt (4) is provided with a connection hole connected with the elastic member (3), the elastic member (3) partially passes through the connection hole, and the first bolt (4) is threadedly connected with the housing (2).

5. The stack encapsulation structure according to claim 2, characterized in that the elastic member (3) is a spring.

6. The stack encapsulation structure according to claim 2, characterized in that the housing (2) is provided with graduation marks (21) for determining the deformation length of the elastic member (3), and the graduation marks (21) are arranged in a column along the height direction of the stack (8).

7. The stack encapsulation structure according to claim 1, wherein the length adjustment structure comprises a threaded sleeve (5) and a second bolt (6), a first end of the threaded sleeve (5) is connected with the elastic structure, and a second end of the threaded sleeve (5) is in threaded connection with the end plate (1) through the second bolt (6).

8. The stack encapsulation structure according to claim 7, wherein the length adjustment structure further comprises a hook bolt (7), a first end of the hook bolt (7) is connected with the elastic structure, a second end of the hook bolt (7) is in threaded connection with a first end of the screw sleeve (5), and the first end and the second end of the screw sleeve (5) are respectively provided with internal threads with opposite rotation directions.

9. The stack encapsulation structure according to any one of claims 1-8, characterized in that weight-reducing holes (11) are provided on the end plates (1).

10. A fuel cell comprising the stack encapsulation structure according to any one of claims 1 to 9.