WO2021207998A1

WO2021207998A1 - Fuel cell stack bundling structure

Info

Publication number: WO2021207998A1
Application number: PCT/CN2020/085055
Authority: WO
Inventors: 陈钊; 高鹏然; 赵立康; 张华农
Original assignee: 深圳市雄韬电源科技股份有限公司
Priority date: 2020-04-13
Filing date: 2020-04-16
Publication date: 2021-10-21
Also published as: CN211743315U

Abstract

A fuel cell stack bundling structure, comprising a stack body (10), a first end plate (20) provided at one end of the stack body (10), a second end plate (30) provided at the other end of the stack body (10), and a metal bundling strip (40); wherein a plurality of first grooves (31) are provided on an outer side surface of the second end plate (30), and a plurality of groove holes (311) are provided within the first grooves (31); springs (50) are provided within in the groove holes (311), one end of each spring (50) abuts against a bottom surface of each groove hole (311), and the length of the spring (50) in a natural state is larger than the depth of the groove hole (311); and a cover plate (60) is clamped in the first groove (31), and the other end of the spring (50) abuts against an inner side surface of the cover plate (60). The fuel cell stack bundling structure eliminates gaps generated by built-in springs, reduces the volume of the stack, reduces the weight of the stack, and improves the volume specific power density and mass specific power density of the stack.

Description

Bundling structure of fuel cell stack

Technical field

The utility model belongs to the technical field of fuel cell bundling, in particular to a fuel cell stack bundling structure.

Background technique

A fuel cell is a chemical device that directly converts the chemical energy of the fuel into electrical energy, also known as an electrochemical generator. It is the fourth power generation technology after hydropower, thermal power generation and nuclear power generation. The fuel cell has no mechanical transmission parts and uses hydrogen and oxygen as raw materials, so there is no noise pollution and very few toxic gases are emitted.

In the current fuel cell development process, the volume specific power density and mass specific power density of the fuel cell stack are very important indicators. When most of the existing fuel cell stacks are bundled with metal straps, the butterfly springs and wave springs are installed inside the stack. Although sufficient pressure inside the stack can be ensured, there will be a gap between the spring and the stack. Moreover, it is easy to deform, and the stability of the overall structure is poor, which affects the overall performance of the fuel cell.

Utility model content

The purpose of the utility model is to provide a fuel cell stack bundling structure. The spring of the fuel cell stack bundling structure is arranged outside the stack, which can ensure the internal pressure of the stack while removing the gap and the spring built-in The required accessory parts can increase the volume specific power density and mass specific power density of the stack, and improve the key parameters of the stack and the stability of the overall structure.

In order to achieve the above objectives, the present invention is achieved through the following technical solutions:

A fuel cell stack bundling structure includes 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 A metal cable tie for binding and fixing the stack body, the first end plate and the second end plate;

A plurality of first grooves are arranged on the outer surface of the second end plate, and a plurality of slot holes are arranged in the first groove; a spring is arranged in the slot hole; one end of the spring is connected to the The bottom surface of the slot abuts, the length of the spring in a natural state is greater than the depth of the slot; a cover plate is clamped in the first groove, and the other end of the spring is in contact with the inner part of the cover plate. The sides abut against each other.

Preferably, the metal strap is circumferentially arranged on the outer surface of the stack body.

Preferably, a plurality of second grooves for positioning the metal cable tie are provided on the outer surface of the first end plate, and the metal cable tie is arranged in the second groove.

Preferably, the second groove is arranged corresponding to the first groove. This arrangement can ensure that the metal cable tie has greater pressure and greater stability after bundling the fuel cell stack.

Preferably, the metal cable tie is adapted to the second groove. In this way, it can be ensured that the metal cable tie is stably fixed in the second groove and will not move left or right.

Preferably, the metal cable tie is abuttingly connected to the two end surfaces of the cover plate.

Preferably, the metal strap and the two end surfaces of the cover plate are connected and fixed by laser welding. The laser welding connection makes the connection between the metal strap and the cover plate firm, which enhances the overall pressure of the stack while ensuring the uniform pressure distribution of the stack.

Preferably, the spring is matched with the slot hole. The slot hole positions the spring so that the spring does not slide in the slot hole.

Preferably, the spring is a butterfly spring. The butterfly spring can bear a great load in a small space, has a good cushioning and shock absorption capacity, and can effectively ensure the pressure and stability of the stack.

The technical scheme proposed by the utility model has the following beneficial effects:

1. This application uses a split welded cover plate. By inserting the spring and cover plate on the outside of the stack, the internal pressure of the stack can be ensured, while the gap generated by the built-in spring and the auxiliary parts required for the built-in spring can be removed, thereby reducing The volume of the stack is reduced, the weight of the stack is reduced, the volume specific power density and the mass specific power density of the stack are also improved, and the key parameters of the stack and the stability of the overall structure are improved.

2. The two ends of the metal cable tie and the cover plate are connected and fixed by laser welding, which further enhances the stability of the stack structure and at the same time ensures the uniform pressure distribution of the stack.

Description of the drawings

FIG. 1 is an exploded view of the structure of the fuel cell stack binding structure according to an embodiment of the utility model.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of them. Examples. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the scope of protection of the present utility model.

It should be noted that if there are directional indications (such as up, down, left, right, front, back, top, bottom...) in the embodiments of the present utility model, the directional indications are only used to explain in a specific posture (As shown in the drawings), if the relative positional relationship, movement, etc. of the components below, if the specific posture changes, the directional indication will also change accordingly.

In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , Or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, it can be the internal connection of two components or the interaction relationship between two components, unless otherwise specified The limit. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in this application can be understood according to specific circumstances.

It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or a central element may also be present. When an element is considered to be "connected" to another element, it can be directly connected to the other element or an intermediate element may be present at the same time.

In addition, if there are descriptions related to "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes, and cannot be understood as instructions or Imply its relative importance or implicitly indicate the number of technical features indicated. Therefore, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on what can be achieved by a person of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be achieved, it should be considered that such a combination of technical solutions does not exist. , Is not within the scope of protection required by the utility model.

The spring installation structure of the existing stack mainly includes the end plate, the spring and the stainless steel plate for the spring. After bundling, there will be a gap of 2mm-5mm between the end plate and the stainless steel plate. If the thickness of the stainless steel plate is not enough, it is easy to bend and increase The thickness of the stainless steel plate increases the weight of the stack and consumes materials. There are also disc springs with small structures between the disc spring cover plate of some stacks and the fuel cell stack, and only the bosses are used to locate the disc springs. The stability of the overall structure of the stack is poor, and the fuel cell is being assembled. Or bumps will inevitably occur during the movement, which will cause different changes in the pressure of the fuel cell stack at various places, which will affect the overall performance of the fuel cell. Moreover, the integral welding increases the weight of the stack.

The utility model proposes a fuel cell stack bundling structure. The spring is placed outside the stack, which not only eliminates gaps and increases the specific power density of the stack; moreover, the application adopts a split welded cover plate, which better reduces power consumption. The weight of the pile.

As shown in Figure 1, the present invention provides a fuel cell stack bundling structure, which includes a stack body 10, a first end plate 20 arranged at one end of the stack body 10, and another A second end plate 30 at one end, and a metal tie 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 arranged on the outer surface of the second end plate 30, and a plurality of slots 311 are arranged in the first grooves 31; a spring 50 is arranged in the slot holes 311; One end of the spring 50 abuts against the bottom surface of the slot 311, the length of the spring 50 in the natural state is greater than the depth of the slot 311; the first groove 31 is provided with a cover plate 60, so The other end of the spring 50 abuts against the inner surface of the cover plate 60.

As a preferred embodiment, the metal cable tie 40 is circumferentially arranged on the outer surface of the stack body 10 in an annular shape.

As a preferred embodiment, the outer surface of the first end plate 20 is provided with a plurality of second grooves 21 for positioning the metal tie 40, and the metal tie 40 is disposed in the second recess.槽21。 In the slot 21.

As a preferred embodiment, the second groove 21 is arranged corresponding to the first groove 31. This arrangement can ensure that the metal tie 40 has greater pressure and greater stability after bundling the fuel cell stack.

As a preferred embodiment, the metal cable tie 40 is adapted to the second groove 21. In this way, it can be ensured that the metal strap 40 is stably fixed in the second groove 21 and will not move left or right.

As a preferred embodiment, the metal cable tie 40 is abuttingly connected to the two end surfaces of the cover plate 60.

As a preferred embodiment, the metal strap 40 and the two end surfaces of the cover plate 60 are connected and fixed by laser welding. The laser welding connection makes the connection between the metal strap 40 and the cover plate 60 firm, which enhances the overall pressure of the stack while ensuring the uniform pressure distribution of the stack.

As a preferred embodiment, the spring 50 is adapted to the slot 311. The slot 311 positions the spring 50 so that the spring 50 does not slide in the slot 311.

As a preferred embodiment, the spring 50 is a butterfly spring. The butterfly spring can bear a great load in a small space, has a good cushioning and shock absorption capacity, and can effectively ensure the pressure and stability of the stack.

The process flow of this embodiment is as follows: first place the first end plate on one end of the stacked stack, place the second end plate on the other end, then put the spring into the slot, and then expose the cover plate and the end of the spring After abutting, the cover plate is clamped with the first groove, the stack is pressed to a specified pressure with a press, and then the metal tie is tensioned with a clamp. At this time, the metal tie and the cover are welded to the At the same time, the part of the cable tie that exceeds the end surface of the cover plate is finally subtracted to form the fuel cell stack binding structure of this embodiment.

This application uses a split welded cover plate. By inserting the spring and the cover plate on the outside of the stack, the internal pressure of the stack can be ensured, while the gap generated by the built-in spring and the auxiliary parts required for the built-in spring can be removed, thereby reducing the electricity. The volume of the stack reduces the weight of the stack, increases the volume specific power density and mass specific power density of the stack, and improves the key parameters of the stack and the stability of the overall structure.

The above are only the preferred embodiments of the present utility model, and do not limit the scope of the present utility model's patents. Any equivalent structural transformation made by using the content of the utility model specification and drawings under the utility model concept of the present utility model, Or direct/indirect application in other related technical fields are included in the scope of patent protection of this utility model.

Claims

A fuel cell stack binding structure includes 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 tie; In the following, a plurality of first grooves are arranged on the outer surface of the second end plate, and a plurality of slot holes are arranged in the first groove; a spring is arranged in the slot hole; one end of the spring is connected with The bottom surface of the slot abuts, the length of the spring in a natural state is greater than the depth of the slot; a cover plate is clamped in the first groove, and the other end of the spring is connected to the cover plate The inner side of the abutting.
The fuel cell stack binding structure according to claim 1, wherein the metal cable tie is circumferentially arranged on the outer surface of the stack body in a ring-shaped circumferential direction.
The fuel cell stack tying structure according to claim 1, wherein a plurality of second grooves for positioning the metal cable tie are provided on the outer surface of the first end plate, and the metal tie The belt is arranged in the second groove.
The fuel cell stack binding structure according to claim 3, wherein the second groove is arranged corresponding to the first groove.
The fuel cell stack binding structure according to claim 3, wherein the metal cable tie is adapted to the second groove.
The fuel cell stack binding structure according to claim 1, wherein the metal cable tie is abuttingly connected to the two end surfaces of the cover plate.
7. The fuel cell stack bundling structure according to claim 6, wherein the metal cable tie and the two ends of the cover plate are connected and fixed by laser welding.
The fuel cell stack binding structure according to claim 1, wherein the spring is matched with the slot hole.
The fuel cell stack binding structure according to claim 1, wherein the spring is a butterfly spring.