阅读说明：本技术 一种燃料电池电堆、燃料电池以及车辆 (Fuel cell stack, fuel cell and vehicle ) 是由 张迪 蒋文彬 于 2021-07-30 设计创作，主要内容包括：本发明公开了一种燃料电池电堆、燃料电池和车辆,该燃料电池电堆包括至少4个拉杆以及与拉杆数量相同的绝缘杆,至少4个拉杆分布在燃料电池电堆的4个侧面上,拉杆包括拉杆本体以及位于拉杆本体两端的连接部,拉杆通过连接部分别与燃料电池电堆的进气端板的侧面以及盲端封板的侧面连接,进气端板和盲端封板的侧面上均设置有用于容纳连接部的沉槽,连接部与沉槽连接；绝缘杆设置在燃料电池电堆的堆芯与拉杆主体之间,且绝缘杆的两端分别与燃料电池电堆的进气端绝缘板和盲端绝缘板接触。燃料电池电堆通过侧面连接以及设置沉槽,使得燃料电池电堆的绝缘以及封装方向的紧固均不需要扩大端板的面积,且有效缩小体积,有利于提高体积功率密度。(The invention discloses a fuel cell stack, a fuel cell and a vehicle, wherein the fuel cell stack comprises at least 4 pull rods and insulating rods with the same quantity as the pull rods, the at least 4 pull rods are distributed on 4 side surfaces of the fuel cell stack, each pull rod comprises a pull rod body and connecting parts positioned at two ends of the pull rod body, the pull rods are respectively connected with the side surface of an air inlet end plate and the side surface of a blind end sealing plate of the fuel cell stack through the connecting parts, the side surfaces of the air inlet end plate and the blind end sealing plate are respectively provided with a sinking groove for accommodating the connecting parts, and the connecting parts are connected with the sinking grooves; the insulating rod is arranged between the reactor core of the fuel cell stack and the pull rod main body, and two ends of the insulating rod are respectively contacted with the air inlet end insulating plate and the blind end insulating plate of the fuel cell stack. The fuel cell stack is connected and set up heavy groove through the side for the area of end plate need not be enlarged in the fastening of the insulating of fuel cell stack and encapsulation direction, and effectively reduces the volume, is favorable to improving volume power density.)

1. A fuel cell stack is characterized by comprising at least 4 pull rods and insulating rods, wherein the number of the insulating rods is the same as that of the pull rods, the at least 4 pull rods are distributed on 4 side faces of the fuel cell stack, each pull rod comprises a pull rod body and connecting parts located at two ends of the pull rod body, the pull rods are respectively connected with the side face of an air inlet end plate and the side face of a blind end sealing plate of the fuel cell stack through the connecting parts, sunken grooves used for accommodating the connecting parts are formed in the side faces of the air inlet end plate and the blind end sealing plate, and the connecting parts are connected with the sunken grooves; the insulating rod is arranged between the reactor core of the fuel cell stack and the pull rod main body, and two ends of the insulating rod are respectively contacted with the air inlet end insulating plate and the blind end insulating plate of the fuel cell stack.

2. The fuel cell stack according to claim 1, wherein a limiting structure for limiting the relative position of the tie rod and the insulating rod is provided on the tie rod and/or the insulating rod.

3. The fuel cell stack of claim 2 wherein the retaining structure comprises cooperating bosses disposed on the tie rods and detents disposed on the insulating rods.

4. The fuel cell stack of claim 3 wherein the tie rod further comprises a bent portion between the body and the connecting portion to form a space between the tie rod body and the core for mounting the insulating rod.

5. The fuel cell stack according to claim 1, wherein a stopper for limiting the axial movement of the insulating rod is provided on a side surface of the inlet end insulating plate and/or the dead end insulating plate.

6. The fuel cell stack according to any one of claims 1-5, wherein the insulating rod is channel-shaped, the insulating rod is fitted over the tie rod, and the insulating rod is in contact with the core and the tie rod, respectively.

7. The fuel cell stack according to any one of claims 1-5, wherein the tie rods are polygonal in cross-section.

8. The fuel cell stack of any of claims 1-5 wherein the axes of the at least 4 tie rods are all perpendicular to both the inlet end plate and the blind end plate.

9. A fuel cell comprising a housing and the fuel cell stack of any one of claims 1-8 disposed within the housing.

10. A vehicle characterized by comprising the fuel cell according to claim 9.

Technical Field

The invention relates to the technical field of fuel cells, in particular to a fuel cell stack, a fuel cell and a vehicle.

Background

A Proton Exchange Membrane Fuel Cell (PEMFC) is a power generation device that directly converts chemical energy of fuel into electric energy, and has the advantages of low working temperature, fast start, high specific power, simple structure, convenient operation, etc., so the fuel cell is widely applied to the industries of automobile industry, energy generation, ship industry, aerospace, household power supply, etc.

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 increase the output of the whole fuel cell, a plurality of single cells are stacked in series to form a fuel cell stack. In order to make the contact resistance of the fuel cell as small as possible, a certain force must be applied so that the gas diffusion layer is compressed, and thus, it is necessary to provide a fastener outside the stack.

In the prior art, a fuel cell stack is fixed by a plurality of screws, and on one hand, it is difficult to ensure that the tightening force of two opposite screws on the fuel cell stack is consistent, so that the anode end plate and the cathode end plate are easily bent due to uneven stress, so that the pressure on a membrane electrode and a bipolar plate of the fuel cell stack is uneven, and the performance of the fuel cell stack is further influenced. And the screw rod is fixed on the end plate through the nut, and the nut and the head of the screw rod occupy larger volume, so that the power density of the whole stack volume is reduced. On the other hand, in consideration of insulativity, the area of the end plate is larger than that of the end face of the electric pile, so that a certain safety gap is formed between the screw and the electric pile, air insulation is realized, and the volume power density of the whole pile is further reduced.

In summary, the screw fixing scheme in the prior art is not favorable for improving the volume power density, and has a certain influence on the performance of the fuel cell stack.

Disclosure of Invention

In order to solve the technical problems, the invention provides a fuel cell stack, a fuel cell and a vehicle, which obviously improve the power density of the fuel cell stack.

The technical scheme adopted for achieving the purpose of the invention is that the fuel cell stack comprises at least 4 pull rods and insulating rods, the number of the insulating rods is the same as that of the pull rods, the at least 4 pull rods are distributed on 4 side surfaces of the fuel cell stack, each pull rod comprises a pull rod body and connecting parts located at two ends of the pull rod body, the pull rods are respectively connected with the side surface of an air inlet end plate of the fuel cell stack and the side surface of a blind end seal plate through the connecting parts, sunken grooves used for accommodating the connecting parts are formed in the side surfaces of the air inlet end plate and the blind end seal plate, and the connecting parts are connected with the sunken grooves; the insulating rod is arranged between the reactor core of the fuel cell stack and the pull rod main body, and two ends of the insulating rod are respectively contacted with the air inlet end insulating plate and the blind end insulating plate of the fuel cell stack.

Furthermore, a limiting structure used for limiting the relative position of the pull rod and the insulating rod is arranged on the pull rod and/or the insulating rod.

Further, limit structure includes matched with boss and constant head tank, the boss sets up on the pull rod, the constant head tank sets up on the insulator spindle.

Further, the rod further includes a bent portion between the body and the connection portion to form a space for installing the insulation rod between the rod body and the core.

Furthermore, a limiting block used for limiting the axial movement of the insulating rod is arranged on the side surface of the air inlet end insulating plate and/or the blind end insulating plate.

Further, the insulator spindle is the cell type, the insulator spindle suit is in on the pull rod, just the insulator spindle respectively with the reactor core with the pull rod contact.

Further, the cross section of the pull rod is polygonal.

Further, the axes of the at least 4 pull rods are all perpendicular to the air inlet end plate and the blind end sealing plate at the same time.

Based on the same inventive concept, the invention also provides a fuel cell, which comprises a shell and the fuel cell stack, wherein the fuel cell stack is arranged in the shell.

Based on the same inventive concept, the invention also provides a vehicle comprising the fuel cell.

According to the technical scheme, the fuel cell stack provided by the invention comprises at least 4 pull rods and insulating rods, wherein the number of the insulating rods is the same as that of the pull rods; wherein: at least 4 pull rods are distributed on 4 sides of the fuel cell stack, each pull rod comprises a pull rod body and connecting parts located at two ends of each pull rod body, each pull rod is connected with the side face of an air inlet end plate of the fuel cell stack and the side face of a blind end sealing plate through the corresponding connecting part, the air inlet end plates and the blind end sealing plates are fixed and limited in the packaging direction, sunken grooves used for containing the connecting parts are formed in the side faces of the air inlet end plates and the blind end sealing plates, the connecting parts are connected with the sunken grooves, the pull rods are connected with the side faces of the end plates, the area of the end plates does not need to be enlarged, the occupied space of the pull rods is small, the size of the whole stack is reduced, and the volume power density of the fuel cell stack can be effectively improved. The insulator spindle sets up between the reactor core of fuel cell pile and pull rod main part, and the both ends of insulator spindle contact with the inlet end insulation board and the blind end insulation board of fuel cell pile respectively, directly prevents the direct contact of reactor core and pull rod main part, realizes the insulation between reactor core and the pull rod, effectively separates the electricity transmission between reactor core and the pull rod. According to the fuel cell stack provided by the invention, through the side connection and the arrangement of the sink groove, the insulation of the fuel cell stack and the fastening in the packaging direction do not need to enlarge the area of the end plate, the volume is effectively reduced, and the volume power density is favorably improved.

In the prior art, when the screw is used for fastening the air inlet end plate and the blind end sealing plate, the area of the end plate needs to be expanded inevitably in order to ensure that a gap is reserved between the screw and the reactor core, so that the area of the air inlet end plate and the area of the blind end sealing plate are larger than the area of the end surface of the reactor core, the axial volume of the screw is large, the screw protrudes out of the surface of the fuel cell stack axially, and the volume power density of the fuel cell stack is reduced. Compared with the prior art, the invention arranges the sinking grooves for accommodating the connecting parts of the pull rods on the side surfaces of the air inlet end plate and the blind end sealing plate, thereby not occupying extra space, ensuring that the pull rods are flush with the surface of the end plate after being installed, and not increasing the area of the end plate, thereby achieving the technical effects of reducing the whole volume and improving the volume power density.

The fuel cell and the vehicle provided by the invention adopt the fuel cell stack to naturally have all the beneficial effects.

Drawings

Fig. 1 is an overall schematic view of a fuel cell stack provided in embodiment 1 of the present invention;

FIG. 2 is an exploded schematic view of the fuel cell stack of FIG. 1;

FIG. 3 is a schematic structural view of the tie rod of FIG. 2;

FIG. 4 is a schematic top view of the drawbar of FIG. 3;

FIG. 5 is a schematic view of a partial connection between the pull rod and the disc spring support plate of FIG. 3;

fig. 6 is a schematic view of a second structure of a tie bar of a fuel cell stack according to embodiment 1 of the present invention;

fig. 7 is a schematic view of the overall structure of a fuel cell stack including the tie rods of fig. 6.

Description of the drawings: 1-a pull rod, 11-a pull rod main body, 12-a connecting part, 13-a bending part and 14-a boss; 2-insulating rod, 21-groove, 22-locating slot; 3-an air inlet end plate; 4-blind end closing plate, 41-blind end plate, 42-disc spring support plate; 5-sinking the tank; 6, a reactor core; 7-an inlet end insulating plate; 8-an air inlet end collector plate; 9-a blind end collector plate; 10-dead end insulation board.

Detailed Description

In order to make the present application more clearly understood by those skilled in the art to which the present application pertains, the following detailed description of the present application is made with reference to the accompanying drawings by way of specific embodiments.

In order to solve the technical problems that the volume of a pile fastener is large, a safety gap is needed, and the power density of the whole pile is small in the prior art, the invention provides a fuel cell pile, a fuel cell and a vehicle, and the power density of the fuel cell pile is obviously improved. The invention is described in detail below by means of 3 examples:

example 1

As shown in fig. 1 to 7, the fuel cell stack provided by the present invention includes at least 4 tie rods 1 and the same number of insulating rods 2 as the tie rods 1; wherein: at least 4 pull rods 1 are distributed on 4 side faces of the fuel cell stack, each pull rod 1 comprises a pull rod 1 body and connecting portions 12 located at two ends of each pull rod 1 body, each pull rod 1 is connected with the side face of an air inlet end plate 3 of the fuel cell stack and the side face of a blind end sealing plate 4 through the connecting portions 12, and fixing and limiting of the air inlet end plate 3 and the blind end sealing plates 4 in the packaging direction are achieved, namely the pull rods 1 are arranged on other 4 side faces where the air inlet end plates 3 and the blind end sealing plates 4 are not arranged in the embodiment. And all be provided with the heavy groove 5 that is used for holding connecting portion 12 on the side of inlet end plate 3 and blind end shrouding 4, connecting portion 12 is connected with heavy groove 5, because pull rod 1 is connected with the side of end plate, so need not enlarge the area of end plate, and pull rod 1 occupation space is little, reduce whole heap volume, can effectively improve the volume power density of fuel cell pile. The insulating rod 2 is arranged between the reactor core 6 of the fuel cell stack and the pull rod main body 11, two ends of the insulating rod 2 are respectively contacted with the air inlet end insulating plate 7 and the blind end insulating plate 10 of the fuel cell stack, the reactor core 6 is directly prevented from being directly contacted with the pull rod 1, the insulation between the reactor core 6 and the pull rod 1 is realized, and the electric transmission between the reactor core 6 and the pull rod 1 is effectively isolated. According to the fuel cell stack provided by the invention, the side surfaces are connected and the sink groove 5 is arranged, so that the insulation of the fuel cell stack and the fastening in the packaging direction do not need to enlarge the area of the end plate, the volume is effectively reduced, and the volume power density is favorably improved.

The connection mode between the pull rod 1 and the end plate is not particularly limited, and the pull rod can be connected with the end plate through screws, rivets or welding. In order to guarantee under the prerequisite of joint strength and rigidity, reduce the quality of pull rod 1 volume as far as possible simultaneously, in this embodiment, the broadband of connecting portion 12 of pull rod 1 is greater than the width of pull rod main part 11, through connecting portion 12 increase with the area of contact of inlet end plate 3 and blind end shrouding 4, in this embodiment, set up threaded hole on connecting portion 12, the quantity of threaded hole can be add, in order to guarantee the fastening effect of pull rod 1, and owing to be connected with the side of end plate, so the screw is on a parallel with the length or the width direction of end plate, the screw rod among the prior art is the thickness of end plate with the actual contact length of end plate, so joint strength between pull rod 1 and the end plate in this embodiment is far greater than joint strength among the prior art.

In order to guarantee the fastening effect, in this embodiment, the pull rod 1 is parallel with the side at its place respectively, and each pull rod 1 is parallel to each other, and the axis of pull rod 1 is perpendicular to air inlet end plate 3 and blind end shrouding 4 simultaneously, and the axial of pull rod 1 is the same with the encapsulation direction promptly, avoids because there is the shearing force that the contained angle leads to between the direction of fastening force and the encapsulation direction of compressing tightly.

In the prior art, the core 6 (membrane electrode + bipolar plate) is only pressed and fixed in the packaging direction, and the periphery is released without fixation. This makes the laying of pile have specific requirement, can only follow specific orientation installation, otherwise the duplication can receive external service environment (gravity, vibration, impact etc.) influence to lead to the position to change, influences pile performance and security, and this results in the pile to receive great restriction when the vehicle is used.

Because the fuel cell pile can receive external service environment (gravity, vibration, impact, etc.) to influence and lead to the position to change, influence pile performance and security, so need fix a position the restriction to insulator spindle 2, because insulator spindle 2 sets up between pull rod 1 and reactor core 6, natural pull rod 1 plays Y to spacing effect to insulator spindle 2, in order to carry out X to spacing through pull rod 1 to insulator spindle 2, in this embodiment, insulator spindle 2 is the cell type, insulator spindle 2 suit is on pull rod 1, insulator spindle 2 contacts with reactor core 6 and pull rod 1 respectively. Meanwhile, the insulating rod 2 is in contact with the stack duplicate, the peripheries of the bipolar plate and the membrane electrode can be fixed, and the packaging direction, namely the axial fixation of the pull rod 1, enables the stack duplicate to be restrained in six directions, the duplicate to be effectively fixed, and the position of the duplicate cannot be influenced by the external use environment (gravity, vibration, impact and the like).

The structure of the insulating rod 2 is not particularly limited, and in order to save materials and effectively control the quality of the assembled fuel cell stack, in the embodiment, the groove 21 is formed in one side, away from the reactor core 6, of the insulating rod 2, the pull rod 1 is arranged in the groove 21, the insulating rod 2 is prevented from moving by combining the boss 14 with the groove 21, and compared with the insulating rod 2 with the sleeve rod structure, the groove 21 is formed in only one side of the insulating rod 2, so that the protruding thickness of the insulating rod 2 on the side surface of the reactor core 6 can be reduced.

The length of the insulating rod 2 is not limited, and when the length of the insulating rod 2 is enough to meet the requirements of the air inlet end insulating plate 7 and the blind end insulating plate 10 respectively under any condition, an additional structure for limiting the Z direction of the insulating rod 2 does not need to be designed. When insulation can not be guaranteed all the time, a positioning structure needs to be designed. As an alternative, the pull rod 1 and/or the insulating rod 2 are/is provided with a limiting structure for limiting the relative position of the pull rod 1 and the insulating rod 2. The limit structure has various embodiments, for example, a structure with a high friction coefficient is fixedly arranged on at least one of the pull rod main body 11 and the insulating rod 2, for example, a colloid with high viscosity or the like, and the relative movement is limited by friction force, or the limit structure is a friction tooth which is embedded and matched. In this embodiment, the limiting structure includes a boss 14 and a positioning groove 22, which are matched with each other, and one of the pull rod 1 and the insulating rod 2 is provided with the boss 14, and the other is provided with the positioning groove 22. Because the pull rod 1 itself needs to bear the axial force as the fastener, preferably, set up boss 14 on the pull rod 1 at the interval, set up the constant head tank 22 that corresponds with boss 14 on the insulator spindle 2 to guarantee spacing intensity, avoid the condition that the railing that leads to because of stress etc. breaks off, prolong the life of pull rod 1, as shown in fig. 3 and fig. 4.

In order to increase the volume of the fuel cell stack, and to increase the volume of the end plate, limit the volume and increase the volumetric power density without increasing the area of the end plate, the tie rod 1 further includes a bent portion 13 between the body and the connecting portion 12 to form a space for installing the insulation rod 2 between the body of the tie rod 1 and the core 6, as shown in fig. 3, when the limit structure of the boss 14 and the positioning groove 22 is adopted, the thickness of the insulation rod 2 needs to be increased to bear shearing force and the like, and in this case, the volume of the fuel cell stack is increased.

As another optional scheme for limiting the Z-direction of the insulating rod 2, a limiting block for limiting the axial movement of the insulating rod 2 is arranged on the side surface of the air inlet end insulating plate 7 and/or the dead end insulating plate 10, the Z-direction movement distance of the insulating rod 2 is limited within a certain range, the insulating rod 2 is tightly attached to the stack repeating unit (the reactor core 6), and the insulating rod 2 isolates the electrical transmission between the stack repeating unit and the pull rod main body 11. At this time, the structure of the drawbar 1 may be optionally provided with a bending portion 13 between the connecting portion 12 and the drawbar main body 11 according to specific conditions, or the connecting portion 12 and the drawbar main body 11 are directly connected, and the whole is in a straight bar shape, which is not specifically limited in this embodiment, as shown in fig. 6.

The cross section shapes of the pull rod 1 and the insulating rod 2 are not particularly limited, and in order to reduce the volume, reduce the occupied space, increase the connection limiting strength and improve the insulating effect of the insulating rod 2, the cross sections of the pull rod 1 and the insulating rod 2 are preferably polygonal. In this embodiment, the pull rod 1 and the insulating rod 2 are both rod members with rectangular cross sections.

The invention does not limit the concrete components and structure of the side of the gas inlet end plate 3 of the fuel cell stack, and the prior art can be referred to, in the embodiment, the gas inlet end plate 3, the gas inlet end insulating plate 7, the gas inlet end current collecting plate 8 and the carbon paper are sequentially arranged from the outer side to the inner side of the gas inlet end plate 3 of the fuel cell stack.

Similarly, the invention does not limit the specific components and structure of the blind end side of the fuel cell stack, and can refer to the prior art, that is, the invention at least comprises a blind end current collecting plate 9, a blind end insulating plate 10 and a blind end plate 41 which are sequentially arranged from the inside to the outside of the fuel cell stack, at this time, the blind end plate 41 is used as a blind end sealing plate 4, two ends of the tie rod 1 are respectively connected and fixed with the side surface of the air inlet end plate 3 and the side surface of the blind end plate 41, and the side surface of the air inlet end plate 3 and the side surface of the blind end sealing plate 4 are correspondingly provided with the sinking grooves 5 for accommodating the connecting parts 12 of the tie rod 1.

Because the working temperature span of the fuel cell stack is large, for example, -20 ℃ to 90 ℃, the temperature changes can cause thermal expansion and cold contraction of each component at different moments, in order to ensure the compression ratio between the membrane electrode and the bipolar plate and reduce the influence of the thermal expansion and cold contraction on the performance of the fuel cell stack, and the thickness of the blind end plate 41 is smaller than that of the air inlet end plate 3 under general conditions, in order to ensure the connection strength, in the embodiment, the outer side of the blind end plate 41 is also provided with the disc spring support plate 42, disc spring mounting holes are arranged on the disc spring support plate 42 at intervals, disc springs are correspondingly arranged between the blind end plate 41 and the disc spring support plate 42, and the self-adaptive adjustment can be realized within a certain range. At this time, the disc spring support plate 42 serves as the blind end seal plate 4, and the air inlet end plate 3 and the disc spring support plate 42 are distributed at two ends of the fuel cell stack in the packaging direction, so in this embodiment, two ends of the pull rod 1 are respectively connected and fixed with the air inlet end plate 3 and the disc spring support plate 42 to apply a fastening force, and the side surface of the air inlet end plate 3 and the side surface of the disc spring support plate 42 are correspondingly provided with the sinking grooves 5 for accommodating the connecting portions 12 of the pull rod 1.

According to the fuel cell stack provided by the invention, the whole stack volume is reduced by adopting the pull rod 1 type fastener, the counter bores are arranged on the side edges of the end plates, the surface of the end plates is flush after the pull rods 1 are installed, namely the pull rods 1 do not protrude out of the surfaces of the end plates, the whole volume is reduced, and the volume power density is improved. Meanwhile, the insulating rod 2 is additionally arranged between the pull rod 1 and the reactor core 6, so that the insulating effect is improved, the area of the end plate is reduced, and the volume power density is further improved. The insulating rod 2 is spacing in X to, Y to and Z to all by, and contact with the laminating of pile duplication under the effect of pull rod 1, can fix around bipolar plate and membrane electrode, in addition the fixed of encapsulation direction for pile duplication receives the restraint in six directions, and the duplication receives effective fixed, and external service environment (gravity, vibration, impact etc.) can not influence the duplication position.

Example 2

Based on the same inventive concept, the invention also provides a fuel cell, which comprises a shell and the fuel cell stack provided by the embodiment 1, wherein the fuel cell stack is arranged in the shell. The type and type of the fuel cell are not particularly limited, and may be any fuel cell in the prior art, such as a proton exchange membrane fuel cell, and other structures of the fuel cell, which are not described in detail in the related art, are disclosed in the related art and will not be described herein.

Example 3

Based on the same inventive concept, the invention also provides a vehicle, which comprises the fuel cell provided by the embodiment 2, namely, the fuel cell stack of the vehicle adopts the structure of the fuel cell stack provided by the embodiment 1, and is fixedly connected through the pull rod 1 and the insulating rod 2. The present invention is not limited to the kind and type of the vehicle, and may be any vehicle in the prior art, such as a household trolley, a passenger car, a truck, etc., and other structures of the vehicle, which are not described in detail in the prior art, may refer to the related disclosure of the prior art, and will not be described herein.

Through the embodiment, the invention has the following beneficial effects or advantages:

1) according to the fuel cell stack provided by the invention, the whole stack volume is reduced by adopting the pull rod type fastener, the counter bore is arranged on the side edge of the end plate, the surface of the end plate is flush after the pull rod is installed, namely the pull rod does not protrude out of the surface of the end plate, the whole volume is reduced, the volume power density is improved, and meanwhile, the insulating rod is additionally arranged between the pull rod and the reactor core, so that the insulating effect is improved, the area of the end plate is reduced, and the volume power density is further improved. And because the connecting rod is connected with the side surface of the end plate, the threaded part is parallel to the length or width direction of the end plate, the actual contact length of the screw rod and the end plate in the prior art is the thickness of the end plate, and the connecting strength between the pull rod and the end plate in the embodiment is far greater than that in the prior art.

2) According to the fuel cell stack provided by the invention, the insulating rod is limited in the X direction, the Y direction and the Z direction, and is in contact with the stack repeating piece under the action of the pull rod, so that the peripheries of the bipolar plate and the membrane electrode can be fixed, and the packaging direction is fixed, so that the stack repeating piece is restrained in six directions, the repeating piece is effectively fixed, and the position of the repeating piece cannot be influenced by the external use environment (gravity, vibration, impact and the like).

While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.