CN216818405U - Fuel cell stack - Google Patents

Abstract

The utility model discloses a fuel cell stack, comprising: the reactor comprises a reactor core, a packaging shell and a plurality of ejector rods; the reactor core comprises: a stack end plate; the reactor core is arranged in the packaging shell, and the reactor end plate is arranged at the first end of the reactor core; the ejector rods are arranged between the electric pile end plate and the packaging shell, one ends of the ejector rods are connected with the packaging shell, and the ejector rods are symmetrically arranged along the symmetrical center of the electric pile end plate; the length of the top rod is gradually reduced from the symmetrical center of the stack end plate to the edge of the stack end plate; the ejector rod with the longest length is abutted to the end plate of the galvanic pile. So set up, the ejector pin is big to the force of the symmetric center of the electric pile end plate, and is little to the edge application of force of electric pile end plate, and is corresponding to the application of force of electric pile end plate in the reactor core when with the reactor core thermal expansion, has reduced the deformation of electric pile end plate.

Description

Fuel cell stack

Technical Field

The utility model relates to the field of energy batteries, in particular to a fuel cell stack.

Background

The fuel cell stack is fastened mainly by a bolt fastening type and a binding band bundling type. The bolt-up formula is the mode of adopting earlier, and the assembly is simple, and the design main points are the order of the size of bolt quantity, distribution, pretightning force and bolt pretightning force. The banding type of the binding band has the advantages of compact structure, capability of realizing relatively high power density, and design points including the material of the binding band, the width and the thickness of the binding band, the distribution quantity and the position of the binding band, and the fixing mode of the binding band. No matter be bolt-on formula or bandage tie up formula, when the pile work expends with heat and contracts with cold, the end plate of pile all can take place to warp, leads to the subassembly contact inhomogeneous in the pile, and the pile performance reduces.

In order to adapt to the change of the working state of the stack, a certain number of springs or disc-shaped laminated sheets are arranged between the packaging shell and the stack by technicians to relieve the stress deformation problem of the stack end plate, but the springs or the disc-shaped laminated sheets only play a relieving role, and the stack end plate still deforms.

Therefore, it is desirable to develop a fuel cell stack structure capable of preventing deformation of stack end plates.

SUMMERY OF THE UTILITY MODEL

The present invention has been made to solve the above problems, and an object of the present invention is to provide a fuel cell stack capable of reducing deformation of an end plate of the stack.

In order to achieve the above object, the present invention provides a fuel cell stack comprising: the reactor comprises a reactor core of the electric pile, a packaging shell and a plurality of ejector rods; the reactor core includes: a stack end plate; the reactor core is arranged in the packaging shell, and the reactor end plate is arranged at the first end of the reactor core; the ejector rods are arranged between the electric pile end plate and the packaging shell, one ends of the ejector rods are detachably connected with the packaging shell and symmetrically arranged along the symmetrical center of the electric pile end plate; the length of the top rod is gradually reduced from the symmetrical center of the stack end plate to the edge of the stack end plate; the ejector rod with the longest length is abutted to the end plate of the pile.

Optionally, a spring is arranged between the ejector rod and the electric pile end plate.

Optionally, a spring connecting piece is arranged between the ejector rod and the spring.

Optionally, the package housing includes: a first shell end plate and a second shell end plate; the first end of the reactor core is fixed with the first shell end plate through the ejector rod, and the second end of the reactor core is directly fixed with the second shell end plate.

Optionally, the number of the top rods is 4-14.

Optionally, the number of the ejector pins is 14, wherein 10 ejector pins are uniformly distributed along the edge of the stack end plate, and 4 ejector pins are abutted against the middle part of the stack end plate.

Optionally, the fuel cell stack further comprises: a tie bar connecting the first housing end plate and the second housing end plate.

Optionally, the distance between the pull rod and the reactor core is 0.5-5 mm.

Optionally, the package housing is provided with a plurality of raised reinforcing ribs.

Compared with the prior art, the utility model has the beneficial effects that:

(1) according to the utility model, the ejector rods with different lengths are arranged between the stack end plate and the packaging shell, the ejector rod close to the symmetric center of the stack end plate is long, and the ejector rod far from the symmetric center of the stack end plate is short.

(2) Compared with a spring, the ejector rod provided by the utility model is not easy to deform when the reactor core is thermally expanded, and can abut against the end plate of the reactor, so that the deformation of the end plate of the reactor is reduced.

(3) The pull rod is connected with the first end plate and the second end plate of the packaging shell and is arranged close to the reactor core, so that the acting torque of the pull rod is reduced, and the deformation of the first end plate and the second end plate is reduced.

Drawings

Fig. 1 is a schematic cross-sectional view of a conventional fuel cell stack. Fig. 1 a is a schematic cross-sectional view of a conventional fuel cell stack after assembly, and fig. 1B is a schematic cross-sectional view of the conventional fuel cell stack in a use state.

Fig. 2 is a schematic cross-sectional view of a fuel cell stack of the present invention.

Fig. 3 is a schematic structural view of a fuel cell stack of the present invention.

FIG. 4 is a schematic view of the connection of the spring and spring connector of the present invention.

Fig. 5 is a schematic structural diagram of the housing of the present invention.

In the figure: the reactor comprises a shell 1, a first shell end plate 2, a second shell end plate 3, a reactor core 4, a reactor end plate 5, a spring 6, a reinforcing rib 7, a pull rod 8, a push rod 9 and a spring connecting piece 10.

Detailed Description

The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.

As shown in fig. 1, most of the conventional fuel cells are packaged and fastened between the stack end plate 5 and the package casing by using connectors having the same length, and the connectors apply the same force to each part of the stack end plate 5. With the arrangement, after the assembly of the electric pile is finished, the electric pile end plate 5 can deform in different degrees, and the stress of the single cells at the front end and the rear end is different from that of other positions of the reactor core, so that an end plate effect is caused; meanwhile, when the reactor core 4 is in thermal expansion during working, due to the limitation of components such as fastening screws, deformation close to the middle part is far larger than edge deformation, so that the deformation of the reactor end plate 5 is more serious.

As shown in fig. 2 and 3, the present invention provides a fuel cell stack including: the reactor comprises a reactor core 4, a packaging shell and a plurality of ejector rods 9; the reactor core 4 includes: a stack end plate 5; the package housing includes: a first housing end plate 2, a second housing end plate 3; the reactor core 4 is arranged in the packaging shell, and the reactor end plate 5 is arranged at the first end of the reactor core 4; the ejector rods 9 are in threaded connection with the packaging shell and are symmetrically arranged along the symmetrical center of the pile end plate 5; after the electric pile is assembled, the deformation of the symmetrical center (middle part) of the electric pile end plate 5 is larger, and the deformation of the edge of the electric pile end plate 5 is smaller. The ejector rod 9 is detachably connected with the packaging shell, and in the assembling and fastening process, the length of different ejector rods 9 penetrating into the packaging shell can be adjusted to apply force to the pile end plate 5, so that the deformation of the pile end plate 5 is reduced or not deformed.

With this arrangement, since the first shell end plate 2 deforms near the middle, the length of the ejector rod 9 extending into the interior of the housing gradually becomes longer, which is determined by the deformation of the first housing end plate 2.

In order to further reduce the deformation of the stack end plate 5, for a number of commonly-used sizes of the stack cores 4, a person skilled in the art can perform limited experiments to design parameters such as the number, the length, the cross-sectional area and the installation position of the ejector rods 9, so as to realize the non-deformation of the stack end plate 5.

Preferably, the cross-sectional area of the lift pins 9 near the center of symmetry of the stack end plate 5 is large, and the cross-sectional area of the lift pins 9 far from the center of symmetry of the stack end plate 5 is small.

In some embodiments, in order to maintain the stress of the reactor core unchanged during the operation or standing of the reactor, a spring 6 is arranged between the mandril 9 and the end plate 5 of the reactor. As shown in fig. 4, since the spring 6 is directly connected to the rod 9, the connection area between the spring 6 and the rod 9 is small, and the structural stability is poor. Therefore, in some embodiments, a spring connecting piece 10 is further arranged between the spring 6 and the ejector rod 9 so as to increase the connecting area of the ejector rod 9 and enhance the structural stability.

Examples

The present embodiment provides a fuel cell stack including: the reactor comprises a reactor core 4, a packaging shell and a plurality of ejector rods 9; the reactor core 4 includes: a stack end plate 5; the package housing further includes: a case 1 connecting a first case end plate 2 and a second case end plate 3; as shown in fig. 5, the housing 1 is provided with a plurality of protruding reinforcing ribs 11 to reinforce the strength and rigidity of the housing 1 and prevent the housing 1 from deforming.

In this embodiment, the first end of the reactor core 4 is fastened with the first shell end plate 2 through the ejector rod 9, the second end of the reactor core 4 is directly fixed with the second shell end plate 3, so the reactor core 4 and the packaging shell are integrally designed, the overall compactness of the reactor is improved, and the batch production of the reactor is convenient.

In this embodiment, the lift pins 9 are provided at the first end of the reactor core 4, and may be 4 to 14. Preferably, the number of the push rods 9 is 14, 10 push rods 9 are uniformly distributed along the edge of the stack end plate 5, and 4 push rods 9 are abutted against the middle part of the stack end plate 5.

The fuel cell stack of this embodiment still is equipped with pull rod 8, pull rod 8 is connected first shell end plate 2 with second shell end plate 3, and hug closely galvanic pile core 4 and set up, has reduced pull rod 8's effect moment, reduces the deformation of first end plate and second end plate.

Due to insulation problems, the tie rod 8 cannot be too close to the core, preferably 0.5-5 mm.

In this embodiment, the top rod 9 is detachably connected with the first housing end plate 2. Specifically, the surface of the ejector rod 9 is provided with threads, and the first shell end plate 2 is provided with a plurality of screw holes, so that the ejector rod 9 is in threaded connection with the first shell end plate 2.

The mounting method of the fuel cell stack of the present embodiment is as follows:

(1) the number, length, cross-sectional area and installation position of the ejector rods 9 are designed according to the size of the reactor core 4, and the first shell end plate 2 is designed and manufactured.

(2) The pre-fastening of the second containment end plate 3 and the stack core 4 is completed using screws, and then the housing 1 and the first containment end plate 2 are installed.

(3) And the mandril 9 is connected with the first shell end plate 2 in a threaded manner to tightly press the reactor core 4 of the electric pile.

In summary, according to the utility model, the ejector rods with different lengths are arranged between the stack end plate and the packaging shell, the ejector rod which is close to the symmetric center of the stack end plate is long, and the ejector rod which is far from the symmetric center of the stack end plate is short.

While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the utility model. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the utility model should be determined from the following claims.

Claims (9)

1. A fuel cell stack, comprising: the reactor comprises a reactor core of the electric pile, a packaging shell and a plurality of ejector rods;

the reactor core includes: a stack end plate; the reactor core is arranged in the packaging shell, and the reactor end plate is arranged at the first end of the reactor core;

the ejector rods are arranged between the electric pile end plate and the packaging shell, one ends of the ejector rods are detachably connected with the packaging shell and symmetrically arranged along the symmetrical center of the electric pile end plate; the length of the top rod is gradually reduced from the symmetrical center of the stack end plate to the edge of the stack end plate; the ejector rod with the longest length is abutted to the end plate of the pile.

2. The fuel cell stack of claim 1, wherein a spring is disposed between the lift pin and the stack end plate.

3. The fuel cell stack of claim 2 wherein a spring connection is provided between the lift pin and the spring.

4. The fuel cell stack of claim 1, wherein the enclosure comprises: a first shell end plate and a second shell end plate;

the first end of the reactor core is fixed with the first shell end plate through the ejector rod, and the second end of the reactor core is directly fixed with the second shell end plate.

5. The fuel cell stack of claim 4 wherein the number of lift pins is 4-14.

6. The fuel cell stack of claim 5, wherein the number of the lift pins is 14, 10 of the lift pins are uniformly distributed along the edge of the stack end plate, and 4 of the lift pins are abutted against the middle of the stack end plate.

7. The fuel cell stack of claim 4, further comprising: a tie bar connecting the first housing end plate and the second housing end plate.

8. The fuel cell stack of claim 7 wherein the tie rod is spaced from the stack core by a distance of 0.5-5 mm.

9. The fuel cell stack of claim 1 wherein said enclosure has a plurality of raised ribs.

Images