CN211743315U

CN211743315U - Fuel cell stack bundling structure

Info

Publication number: CN211743315U
Application number: CN202020540606.5U
Authority: CN
Inventors: 陈钊; 高鹏然; 赵立康; 张华农
Original assignee: Shenzhen Center Power Tech Co Ltd
Current assignee: Shenzhen Center Power Tech Co Ltd
Priority date: 2020-04-13
Filing date: 2020-04-13
Publication date: 2020-10-23
Anticipated expiration: 2030-04-13
Also published as: WO2021207998A1

Abstract

The utility model relates to a fuel cell pile binding structure belongs to fuel cell and ties up technical field. The fuel cell stack bundling structure comprises a stack body, a first end plate arranged at one end of the stack body, a second end plate arranged at the other end of the stack body and a metal ribbon, wherein the stack body comprises a first metal layer and a second metal layer, the first metal layer is arranged on the first end plate, and the second metal layer is arranged on the second end plate and the metal ribbon: a plurality of first grooves are formed in the outer side surface of the second end plate, and a plurality of slotted holes are formed in the first grooves; a spring is arranged in the slotted hole; one end of the spring is abutted against the bottom surface of the slotted hole, and the length of the spring in a natural state is greater than the depth of the slotted hole; the first groove is internally clamped with a cover plate, and the other end of the spring is abutted against the inner side surface of the cover plate. The utility model discloses a fuel cell pile ties up structure has eliminated the built-in clearance that produces of spring, has reduced the volume of pile, has alleviateed the weight of pile, has promoted the volume specific power density and the quality specific power density of pile, has wide application prospect.

Description

Fuel cell stack bundling structure

Technical Field

The utility model belongs to the technical field of fuel cell ties up, especially, relate to a fuel cell pile tying up structure.

Background

A fuel cell is a chemical device that directly converts chemical energy of fuel into electrical energy, and is also called an electrochemical generator. It is a fourth power generation technology following hydroelectric power generation, thermal power generation and atomic power generation. The fuel cell has no mechanical transmission parts, uses hydrogen and oxygen as raw materials, and therefore has no noise pollution and emits few toxic gases.

In the current development process of fuel cells, the volume specific power density and the mass specific power density of a fuel cell stack are important indexes. When most of existing fuel cell galvanic piles are bundled by using metal strips, the belleville springs and the wave springs are installed inside the galvanic piles, and although enough pressure can be guaranteed inside the galvanic piles, gaps can exist between the springs and the galvanic piles, the galvanic piles are easy to deform, the stability of the whole structure is poor, and therefore the overall performance of the fuel cells is affected.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a structure is tied up to fuel cell pile, this structure is tied up to fuel cell pile's spring sets up in the pile outside, can get rid of the built-in clearance that produces of spring and the built-in required accessory part of spring when guaranteeing pile internal pressure, improves the volume ratio power density and the quality ratio power density of pile, promotes the key parameter and the overall structure's of pile stability.

In order to achieve the above object, the utility model discloses a following technical scheme realizes:

a fuel cell stack bundling structure comprises a stack body, a first end plate arranged at one end of the stack body, a second end plate arranged at the other end of the stack body, and a metal bundling belt used for bundling and fixing the stack body, the first end plate and the second end plate;

a plurality of first grooves are formed in the outer side surface of the second end plate, and a plurality of slotted holes are formed in the first grooves; a spring is arranged in the slotted hole; one end of the spring is abutted against the bottom surface of the slotted hole, and the length of the spring in a natural state is greater than the depth of the slotted hole; the first groove is internally clamped with a cover plate, and the other end of the spring is abutted against the inner side surface of the cover plate.

Preferably, the metal bandage is arranged on the outer surface of the pile body in an annular circumferential mode.

Preferably, be provided with many second recesses that are used for fixing a position on the lateral surface of first end plate the metal ribbon set up in the second recess.

Preferably, the second groove is disposed corresponding to the first groove. The arrangement can ensure that the metal binding belt has larger pressure and stronger stability after binding the fuel cell stack.

Preferably, the metal tie fits into the second groove. Therefore, the metal cable tie can be stably fixed in the second groove and cannot move left and right.

Preferably, the metal cable tie is connected with two end faces of the cover plate in an abutting mode.

Preferably, the metal cable tie and the two end faces of the cover plate are fixedly connected through laser welding. The metal binding belt is connected with the cover plate through laser welding, so that the pressure distribution of the galvanic pile is uniform while the overall pressure of the galvanic pile is enhanced.

Preferably, the spring is fitted to the slot. The slot positions the spring so that the spring does not slide within the slot.

Preferably, the spring is a belleville spring. The belleville springs can bear great load in a small space, have good buffering and shock absorbing capacity and can effectively ensure the pressure and the stability of the galvanic pile.

The utility model provides an among the technical scheme, following beneficial effect has:

1. this application adopts split type welding apron, through inlaying spring and apron in the outside of pile, can get rid of the built-in clearance that produces of spring and the built-in required accessory part of spring when guaranteeing pile internal pressure, has reduced the volume of pile, has alleviateed the weight of pile, has also improved the volume specific power density and the quality specific power density of pile, promotes the key parameter and the overall structure's of pile stability.

2. The metal ribbon with the both ends face of apron is connected fixedly through laser welding, further strengthens the stability of galvanic pile structure, guarantees simultaneously that the pressure distribution of galvanic pile is even.

Drawings

Fig. 1 is an exploded view of a fuel cell stack bundling structure according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely 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. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as upper, lower, left, right, front, back, top and bottom … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The spring mounting structure of the existing galvanic pile mainly comprises an end plate, a spring and a stainless steel plate for arranging the spring, after the binding, a gap of 2mm-5mm is formed between the end plate and the stainless steel plate, if the thickness of the stainless steel plate is not enough, the stainless steel plate is easy to bend, and the increase of the thickness of the stainless steel plate increases the weight of the galvanic pile and consumes materials. There is only the less dish spring of structure and only uses the boss to fix a position the dish spring between the dish spring apron of some galvanic piles and the fuel cell galvanic pile, and galvanic pile overall structure's stability is relatively poor, and fuel cell takes place to collide with at the assembly or removal in-process inevitability moreover, thereby this can make the fuel cell galvanic pile take place different changes in everywhere pressure and influence fuel cell wholeness ability. Moreover, the integral welding increases the weight of the stack.

The utility model provides a fuel cell stack binding structure, which arranges the spring outside the stack, not only eliminates the gap and improves the volume ratio power density of the stack; and this application adopts split type welded cover plate, the better weight that has reduced the pile.

As shown in fig. 1, the present invention provides a fuel cell stack binding structure, which includes a stack body 10, a first end plate 20 disposed at one end of the stack body 10, a second end plate 30 disposed at the other end of the stack body 10, and a metal binding tape 40 for binding and fixing the stack body 10, the first end plate 20, and the second end plate 30;

a plurality of first grooves 31 are formed in the outer side surface of the second end plate 30, and a plurality of slotted holes 311 are formed in the first grooves 31; a spring 50 is arranged in the slotted hole 311; one end of the spring 50 abuts against the bottom surface of the slot 311, and the length of the spring 50 in a natural state is greater than the depth of the slot 311; a cover plate 60 is clamped in the first groove 31, and the other end of the spring 50 is abutted against the inner side surface of the cover plate 60.

In a preferred embodiment, the metal strapping tape 40 is disposed on the outer surface of the stack body 10 in a ring shape.

In a preferred embodiment, a plurality of second grooves 21 for positioning the metal cable ties 40 are disposed on the outer side surface of the first end plate 20, and the metal cable ties 40 are disposed in the second grooves 21.

In a preferred embodiment, the second groove 21 is disposed corresponding to the first groove 31. This arrangement ensures that the metal strap 40 has a greater pressure and greater stability after the fuel cell stack is bundled.

In a preferred embodiment, said metal band 40 is adapted to said second recess 21. This ensures that the metal cable tie 40 is stably fixed in the second recess 21 without moving left and right.

In a preferred embodiment, the metal ties 40 are connected against both end faces of the cover plate 60.

In a preferred embodiment, the metal cable tie 40 and the cover plate 60 are fixed by laser welding. The metal binding belt 40 and the cover plate 60 are firmly connected through laser welding connection, so that the pressure distribution of the pile is uniform while the integral pressure of the pile is enhanced.

In a preferred embodiment, the spring 50 is fitted into the slot 311. The slot 311 positions the spring 50 such that the spring 50 does not slide within the slot 311.

In a preferred embodiment, the spring 50 is a belleville spring. The belleville springs can bear great load in a small space, have good buffering and shock absorbing capacity and can effectively ensure the pressure and the stability of the galvanic pile.

The process flow of the embodiment is as follows: the method comprises the steps of firstly placing a first end plate at one end of a stacked electric pile, placing a second end plate at the other end, then placing a spring into a slotted hole, clamping the cover plate and a first groove after the cover plate is abutted to the exposed end of the spring, pressing the electric pile to a specified pressure by using a press, tensioning a metal binding belt by using a clamp, welding the metal binding belt and the cover plate together by using laser at the moment, and finally subtracting the part of the binding belt exceeding the upper end face of the cover plate to form the fuel cell electric pile binding structure of the embodiment.

This application adopts split type welding apron, through inlaying spring and apron in the outside of pile, can get rid of the built-in clearance that produces of spring and the built-in required accessory part of spring when guaranteeing pile internal pressure, has reduced the volume of pile, has alleviateed the weight of pile, has also improved the volume specific power density and the quality specific power density of pile, promotes the key parameter and the overall structure's of pile stability.

The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.

Claims

1. A fuel cell stack bundling structure comprises a stack body, a first end plate arranged at one end of the stack body, a second end plate arranged at the other end of the stack body and a metal bundling belt; the method is characterized in that: a plurality of first grooves are formed in the outer side surface of the second end plate, and a plurality of slotted holes are formed in the first grooves; a spring is arranged in the slotted hole; one end of the spring is abutted against the bottom surface of the slotted hole, and the length of the spring in a natural state is greater than the depth of the slotted hole; the first groove is internally clamped with a cover plate, and the other end of the spring is abutted against the inner side surface of the cover plate.

2. The fuel cell stack bundle structure according to claim 1, wherein: the metal ribbon is arranged on the outer surface of the galvanic pile body in an annular circumferential direction.

3. The fuel cell stack bundle structure according to claim 1, wherein: be provided with many on the lateral surface of first end plate and be used for the location the second recess of metal ribbon, the metal ribbon set up in the second recess.

4. The fuel cell stack bundle structure according to claim 3, wherein: the second groove is arranged corresponding to the first groove.

5. The fuel cell stack bundle structure according to claim 3, wherein: the metal binding belt is matched with the second groove.

6. The fuel cell stack bundle structure according to claim 1, wherein: the metal binding belt is connected with the two end faces of the cover plate in an abutting mode.

7. The fuel cell stack bundle structure according to claim 6, wherein: the metal binding belt and the two end faces of the cover plate are fixedly connected through laser welding.

8. The fuel cell stack bundle structure according to claim 1, wherein: the spring is matched with the slotted hole.

9. The fuel cell stack bundle structure according to claim 1, wherein: the spring is a belleville spring.