阅读说明：本技术 一种端板受力可调节的燃料电池电堆 (Fuel cell stack with adjustable end plate stress ) 是由 刘建飞 徐黎明 许康 于 2020-09-07 设计创作，主要内容包括：本发明公开了一种端板受力可调节的燃料电池电堆,涉及燃料电池技术领域,包括电堆机构,电堆机构的两端分别设有固定端板和调节端板机构,调节端板机构包括调节端板和与调节端板配合的调节组件,调节组件位于调节端板和电堆机构之间,调节组件包括弹簧端板,弹簧端板的一侧与电堆机构固定连接,调节端板机构向电堆机构提供由弹簧端板的中心向四周逐渐减小的压力。本发明通过调节组件工作使电堆内部各点受力大小相同,更加完善燃料电池的电堆结构设计,既能够避免极板与MEA间初始装配间隙过大,也能够防止电堆密封效果较差和反应气体泄漏,引起更加严重的后果,提高了燃料电池的性能、质量以及使用寿命,降低了燃料电池使用时的安全隐患。(The invention discloses a fuel cell stack with an adjustable end plate stress, which relates to the technical field of fuel cells and comprises a stack mechanism, wherein a fixed end plate and an adjusting end plate mechanism are respectively arranged at two ends of the stack mechanism, the adjusting end plate mechanism comprises an adjusting end plate and an adjusting assembly matched with the adjusting end plate, the adjusting assembly is positioned between the adjusting end plate and the stack mechanism, the adjusting assembly comprises a spring end plate, one side of the spring end plate is fixedly connected with the stack mechanism, and the adjusting end plate mechanism provides the stack mechanism with pressure gradually reduced from the center of the spring end plate to the periphery. The invention enables the stress of each point in the galvanic pile to be the same through the work of the adjusting component, thereby perfecting the structural design of the galvanic pile of the fuel cell, not only avoiding the overlarge initial assembly gap between the polar plate and the MEA, but also preventing the worse sealing effect of the galvanic pile and the leakage of reaction gas from causing more serious consequences, improving the performance, the quality and the service life of the fuel cell and reducing the potential safety hazard when the fuel cell is used.)

1. A fuel cell stack with adjustable end plate stress comprises a stack mechanism (1) and is characterized in that: the electric pile mechanism comprises a pile mechanism body (1) and is characterized in that two ends of the pile mechanism body (1) are respectively provided with a fixed end plate (2) and an adjusting end plate mechanism (3), the adjusting end plate mechanism (3) comprises an adjusting end plate (31) and an adjusting assembly (32) matched with the adjusting end plate (31), the adjusting assembly (32) is positioned between the adjusting end plate (31) and the pile mechanism body (1), a plurality of fixing rods (4) used for connecting the fixed end plate (2) and the adjusting end plate (31) are arranged between the fixed end plate (2) and the adjusting end plate (31), and two ends of each fixing rod (4) are respectively connected with the fixed end plate (2) and the; the adjusting component (32) comprises a spring end plate (321), one side of the spring end plate (321) is fixedly connected with the pile mechanism (1), and the adjusting end plate mechanism (3) is used for providing pressure which is gradually reduced from the center of the spring end plate (321) to the periphery to the pile mechanism (1).

2. The fuel cell stack with adjustable end plate stress of claim 1, wherein: the adjusting assembly (32) further comprises a plurality of springs (322) and a plurality of positioning grooves (323), one ends of the springs (322) are fixedly connected with the other side of the spring end plate (321), the positioning grooves (323) are distributed on the adjusting end plate (31) in an array mode, the springs (322) correspond to the positioning grooves (323) one to one, and the other ends of the springs (322) are all inserted into the corresponding positioning grooves (323).

3. The fuel cell stack with adjustable end plate stress of claim 2, wherein: the depth of the positioning groove (323) is gradually increased from the center of the adjusting end plate (31) to the periphery.

4. The fuel cell stack with adjustable end plate stress of claim 1, wherein: the adjusting component (32) also comprises a plurality of springs (322) and a plurality of positioning grooves (323), one end of each spring (322) is fixedly connected with the other side of the spring end plate (321), the positioning grooves (323) are distributed on the adjusting end plate (31) in an array, the springs (322) are in one-to-one correspondence with the positioning grooves (323), the other end of each spring (322) is inserted into the corresponding positioning groove (323), an adjusting block (324) in sliding fit with each positioning groove (323) is arranged in each positioning groove (323), adjust and all be equipped with one rather than the regulation screw hole that communicates corresponding every constant head tank (323) on end plate (31), every one side of regulating block (324) all is equipped with adjusting threaded rod (325) of being connected with the regulation screw hole, adjusting threaded rod (325) with adjusting threaded hole screw-thread fit.

5. The fuel cell stack with adjustable end plate force as claimed in claim 4, wherein: the end part of each adjusting threaded rod (325) is provided with a knob (5).

6. The fuel cell stack with adjustable end plate force according to any one of claims 2-5, wherein: and the elastic coefficient of the spring (322) on the adjusting end plate (31) is gradually reduced from the center to the periphery.

7. The fuel cell stack with adjustable end plate stress of claim 1, wherein: the adjusting assembly (32) further comprises a plurality of adjusting grooves (326) and a plurality of adjusting pistons (327), the plurality of adjusting grooves (326) are distributed on one side of the adjusting end plate (31) in an array mode, the plurality of adjusting pistons (327) correspond to the plurality of adjusting grooves (326) in a one-to-one mode and are in sliding fit, one end of each adjusting piston (327) is connected with the spring end plate (321), and a hydraulic pipe (328) used for communicating the adjusting grooves (326) with each other is arranged on one side of each adjusting groove (327).

8. The fuel cell stack with adjustable end plate force of claim 7, wherein: every the notch department of adjusting groove (326) all is equipped with spacing ring (6), every the front end of adjusting piston (327) all is equipped with and carries out spacing step (7) with spacing ring (6) cooperation to adjusting piston (327).

Technical Field

The invention relates to the technical field of fuel cells, in particular to a fuel cell stack with an adjustable end plate stress.

Background

The fuel cell stack is formed by serially assembling a plurality of same single cells and mainly comprises assemblies such as end plates, bipolar plates, membrane electrodes, sealing gaskets and the like, wherein each single cell receives assembly pressure under the action of fastening bolts of the end plates, and the bipolar plates are statically indeterminate between the MEA's. Dry frequency et al, in the "distribution law of contact pressure of a metal plate fuel cell stack", indicate that the transfer mechanism of the internal assembly pressure of the stack is as follows: after the torque is applied, the end plate generates assembly force on the metal polar plate, and the metal polar plate compresses the sealing gasket under the action of the assembly force to reduce the thickness of the sealing gasket so as to be contacted with the MEA. Therefore, the assembly force generated by the bolt assembly torque after the assembly of the stack is completed is shared by the sealing gasket and the MEA. Typically, the seal gasket is thicker than the MEA, thus allowing an initial fit gap between the plate and MEA. If the seal gasket is too thick, it can result in too large an initial assembly gap between the plate and MEA. At this time, if the bolt assembling torque is insufficient, the contact between the electrode plate and the MEA is insufficient and the contact pressure of the MEA is small, so that the contact resistance is increased to degrade the performance of the PEMFC, and vice versa. If the thickness of the sealing gasket is too small, the excessive contact between the electrode plate and the MEA and the excessive contact pressure on the MEA can be caused, and the MEA is damaged; even the poor sealing effect of the galvanic pile and the leakage of reaction gas are caused due to the insufficient thickness of the sealing washer, so that more serious results are caused.

In addition, in the actual assembly process, four corners of the end plate are fixed through bolts, so that the assembly displacement is large, the middle displacement is small, and a small amount of uneven deformation exists. This is because bolt-fitting torque is applied to the four corners and the center of the four sides of the end plate, resulting in less warpage of the end plate, thereby causing uneven contact between the components in the stack. The metal electrode plate is also displaced more at the four corners and less at the central area. These problems further amplify the above-mentioned consequences and can have a serious impact on the performance, quality and service life of the fuel cell, even when used, causing safety hazards.

Further, prior art fuel cell stacks, once assembled, can further exacerbate the effects of unbalanced assembly forces on fuel cell life over a period of time. However, there is no fuel cell stack in the prior art that can adjust the internal assembly force of the fuel cell after a period of use to avoid accelerated degradation of the fuel cell.

Disclosure of Invention

The invention aims to provide a fuel cell stack with an adjustable end plate stress, which aims to solve the technical problems that the stress of each point between bipolar plates in a fuel cell is unequal in size and the internal assembly force of the fuel cell cannot be adjusted in the using process in the prior art.

The invention provides a fuel cell pile with an adjustable end plate stress, which comprises a pile mechanism, wherein a fixed end plate and an adjusting end plate mechanism are respectively arranged at two ends of the pile mechanism; the adjusting component comprises a spring end plate, one side of the spring end plate is fixedly connected with the pile mechanism, and the adjusting end plate mechanism is used for providing pressure which is gradually reduced from the center of the spring end plate to the periphery of the pile mechanism.

Furthermore, the adjusting part still includes a plurality of spring and a plurality of constant head tank, all the one end of spring all with the opposite side fixed connection of spring end plate, all the constant head tank is the array distribution on adjusting the end plate, a plurality of spring and a plurality of constant head tank one-to-one and the other end of every spring all pegs graft in the constant head tank that corresponds.

Furthermore, the depth of the positioning groove is gradually increased from the center of the adjusting end plate to the periphery.

Further, the elastic coefficient of the spring on the adjusting end plate is gradually reduced from the center to the periphery.

Furthermore, the adjusting part still includes a plurality of spring and a plurality of constant head tank, all the one end of spring all with the opposite side fixed connection of spring end plate, all the constant head tank is the array distribution on adjusting the end plate, and a plurality of spring and the other end of a plurality of constant head tank one-to-one and every spring all peg graft in the constant head tank that corresponds, every all be equipped with in the constant head tank rather than sliding fit's regulating block, it all is equipped with an adjusting screw hole rather than the intercommunication to correspond every constant head tank on adjusting the end plate, every one side of regulating block all is equipped with the adjusting screw rod of being connected with adjusting screw hole, adjusting screw rod with adjusting screw hole screw-thread fit.

Further, the end part of each adjusting threaded rod is provided with a knob.

Further, the elastic coefficient of the spring on the adjusting end plate is gradually reduced from the center to the periphery.

Further, the adjusting part still includes a plurality of adjustment tank and a plurality of adjusting piston, and a plurality of adjustment tank is the array and distributes in one side of adjusting the end plate, and a plurality of adjusting piston and a plurality of adjustment tank one-to-one and sliding fit and the one end of every adjusting piston all are connected with the spring end plate, and one side of every adjustment tank all is equipped with the hydraulic pressure pipe that is used for its and adjustment tank intercommunication.

Furthermore, every the notch department of adjustment tank all is equipped with the spacing ring, every the front end of adjusting piston all is equipped with and carries out spacing step with the spacing ring cooperation to adjusting piston.

Compared with the prior art, the invention has the beneficial effects that:

(1) when the fuel cell stack with the adjustable stress of the end plate works, the adjusting assembly extrudes the spring end plate to change the pressure to each stress point of the spring end plate, so that all stress points of the spring end plate are not deformed, the stress of each point in the stack tends to be the same, the stack structural design of the fuel cell is more perfect, the overlarge initial assembly gap between a polar plate and an MEA (membrane electrode assembly) can be avoided, the poor sealing effect of the stack and the leakage of reaction gas can be prevented, more serious consequences can be caused, the performance, the quality and the service life of the fuel cell are improved, and the potential safety hazard when the fuel cell is used is reduced.

(2) The fuel cell stack with the adjustable stress of the end plate can still manually and actively carry out dynamic adjustment on the assembly force after the fuel cell stack is used for a period of time, so that the service life of the fuel cell is effectively prolonged, and more serious results caused by unbalanced assembly force in the use process of the fuel cell are avoided.

Drawings

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

FIG. 1 is a schematic perspective view of a first embodiment;

FIG. 2 is a top view of the first embodiment;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is a schematic perspective view of the second embodiment;

FIG. 5 is a sectional view of the second embodiment;

FIG. 6 is an enlarged view at B in FIG. 5;

FIG. 7 is a schematic perspective view of a third embodiment;

FIG. 8 is a sectional view of a third embodiment;

fig. 9 is an enlarged view at C in fig. 8.

Reference numerals:

the device comprises a pile mechanism 1, a fixed end plate 2, an adjusting end plate mechanism 3, an adjusting end plate 31, an adjusting assembly 32, a spring end plate 321, a spring 322, a positioning groove 323, an adjusting block 324, an adjusting threaded rod 325, an adjusting groove 326, an adjusting piston 327, a hydraulic pipeline 328, a fixing rod 4, a knob 5, a limiting ring 6 and a limiting step 7.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention.

The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.

All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being 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," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.