Fuel cell stack integrated connection structure

Abstract

The utility model discloses an integrated connection structure of a fuel cell stack, which comprises an upper end plate, a lower end plate and a locking bolt arranged between the upper end plate and the lower end plate in a penetrating manner, and the bottom of the upper end plate is provided with a first positioning groove used for clamping the top end of a cell stack main body; the top of the lower end plate is provided with a second positioning groove for clamping the bottom end of the cell stack main body, and the elastic jacking assembly is fixedly arranged on the top surface of the first positioning groove and is used for jacking the upper end surface of the cell stack main body; and the lateral elastic extrusion parts are fixedly arranged on the side walls of the first positioning groove and the second positioning groove and are used for jacking and pressing the parts, clamped into the first positioning groove and the second positioning groove, of the cell stack main body. According to the utility model, the cell stack main body between the upper end plate and the lower end plate is locked by using the locking bolt, and the elastic jacking assembly is arranged on the upper end plate, so that the distance between the upper end plate and the lower end plate is not changed while size compensation is provided.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cells, and in particular to an integrated connection structure of a fuel cell stack. Background Art

[0002] A fuel cell stack is an integral structure composed of multiple individual fuel cells, and its function is to realize the functions of a fuel cell system. A fuel cell stack can obtain the required voltage and power output by connecting multiple individual fuel cells in series. The commonly used integrated connection structure of fuel cells is mainly to set end plates at both ends of the fuel cell stack, and use multiple screws to lock the two end plates to compress the fuel cell stack in the middle to ensure its integrity and stability. However, due to the high operating temperature of the fuel cell, a large temperature difference will be generated during use. Under the influence of the thermal expansion and contraction effect, the locking force at both ends of the fuel cell stack will change suddenly, affecting its working performance.

[0003] According to the solution proposed in the "Fuel Cell Stack Packaging Structure" (authorization announcement number: CN 219677298) disclosed on the patent website, an elastic connector is provided between the two end plates to replace the screws to lock the end plates. The elastic connector compensates for the dimensional change of the fuel cell stack during thermal expansion and contraction, enhances its performance stability, and can better solve the above-mentioned problem. However, another problem is that when the elastic connector is performing dimensional compensation, the distance between the two end plates also changes, and the overall size of the fuel cell stack changes. After assembly and commissioning, the change in size may squeeze the surrounding components, causing damage to the fuel cell stack itself or other surrounding components, which is not conducive to use.

[0004] To this end, the present application proposes a fuel cell stack integrated connection structure to solve the above technical problems. Utility Model Content

[0005] The main purpose of the utility model is to solve the above-mentioned deficiencies and provide an integrated connection structure for a fuel cell stack, which provides size compensation for the fuel cell stack while ensuring that the size of the whole formed by the fuel cell stack and the connection structure does not change.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A fuel cell stack integrated connection structure comprises an upper end plate, a lower end plate and a locking bolt passing through the upper end plate and the lower end plate, wherein the bottom of the upper end plate is provided with a first positioning groove for clamping the top end of the battery stack body, and the top of the lower end plate is provided with a second positioning groove for clamping the bottom end of the battery stack body, and further comprises: an elastic pressing component fixedly arranged on the top surface of the first positioning groove, for pressing the upper end surface of the battery stack body; a lateral elastic extrusion piece fixedly arranged on the side walls of the first positioning groove and the second positioning groove, for pressing the part of the battery stack body clamped into the first positioning groove and the second positioning groove.

[0008] Furthermore, the elastic pressing assembly includes a first elastic member fixedly arranged at the four corners of the top surface of the first positioning groove and a pressing plate fixedly arranged at the bottom of the first elastic member.

[0009] Furthermore, the first elastic member includes an upper plug column and a lower plug column that are movably connected to each other and a spring that is sleeved on the outside of the upper plug column and the lower plug column. The end plates of the upper plug column and the lower plug column are both provided with annular grooves, and both ends of the spring are clamped in the annular grooves.

[0010] Furthermore, the lateral elastic extrusion member includes a first extrusion component arranged on the same side groove wall of the first positioning groove and the second positioning groove, and a second extrusion component arranged on the groove wall adjacent to the first extrusion component, the first extrusion component includes a second elastic member fixedly arranged on the groove wall and an extrusion plate fixedly arranged at the telescopic end of the second elastic member, and the second extrusion component has the same structure as the first extrusion component.

[0011] Furthermore, the second elastic member includes a spring pin penetrating through the groove wall and a connecting block fixedly arranged at the end of the spring pin head, and the connecting block is fixedly connected to the extrusion plate.

[0012] The beneficial effects of the utility model are embodied in:

[0013] 1. The utility model realizes the integrated connection of the fuel cell by locking the battery stack body between the upper end plate and the lower end plate through the use of locking bolts, and arranges an elastic top pressure component in the first positioning groove of the upper end plate to provide dimensional compensation for the thermal expansion and contraction of the battery stack body in the vertical direction, thereby ensuring its compressive stability. While realizing dimensional compensation, the distance between the upper end plate and the lower end plate remains unchanged. Therefore, after the battery stack body using this connection structure is assembled and put into use, the surrounding parts will not be squeezed due to temperature changes.

[0014] 2. The utility model provides dimensional compensation in the horizontal direction for the battery stack body by arranging lateral elastic extrusion parts on the side walls of the first positioning groove and the second positioning groove, thereby preventing the battery stack body from being pressed against the side walls of the first positioning groove and the second positioning groove due to heat, thereby causing damage to the battery stack body. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0016] Figure 1 This is a schematic diagram of the installation and use status of an embodiment of the utility model;

[0017] Figure 2 This is a schematic diagram of the disassembly of an embodiment of the utility model;

[0018] Figure 3 This is a schematic diagram of the bottom structure of the upper end plate of an embodiment of the utility model;

[0019] Figure 4 This is a schematic diagram of the structure of an elastic top pressing component according to an embodiment of the utility model;

[0020] Figure 5 This is a schematic structural diagram of a first extrusion assembly according to an embodiment of the utility model;

[0021] Figure 6 This is a schematic diagram of the structure of a first elastic member according to an embodiment of the utility model;

[0022] Figure 7 This is a schematic diagram of the internal structure of the lower end plate of an embodiment of the utility model;

[0023] Figure 8 It is a half-section schematic diagram of the installation and use status of one embodiment of the utility model.

[0024] In the figure: 1. upper end plate; 2. lower end plate; 3. locking bolt; 4. battery stack body; 5. first positioning groove; 6. second positioning groove; 7. elastic top pressure assembly; 71. first elastic member; 711. upper plug column; 712. lower plug column; 713. spring; 72. top pressure plate; 8. lateral elastic extrusion member; 81. first extrusion assembly; 811. second elastic member; 8111. spring pin; 8112. connecting block; 812. extrusion plate; 82. second extrusion assembly; 9. annular groove. DETAILED DESCRIPTION

[0025] The following will be combined with the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0026] like Figure 1-8 As shown, the utility model provides an integrated connection structure of a fuel cell stack, comprising: an upper end plate 1, a lower end plate 2 and a locking bolt 3 passing through the upper end plate 1 and the lower end plate 2, a first positioning groove 5 for clamping the top of a battery stack body 4 is opened at the bottom of the upper end plate 1, a second positioning groove 6 for clamping the bottom of the battery stack body 4 is opened at the top of the lower end plate 2, and further comprising:

[0027] An elastic pressing component 7 is fixedly arranged on the top surface of the first positioning groove 5 and is used to press the upper end surface of the battery stack body 4;

[0028] The lateral elastic extrusion member 8 is fixedly disposed on the side walls of the first positioning groove 5 and the second positioning groove 6 , and is used to press the portion of the battery stack body 4 that is inserted into the first positioning groove 5 and the second positioning groove 6 .

[0029] When in use, the two ends of the battery stack body 4 are respectively clamped in the first positioning groove 5 and the second positioning groove 6, and the locking bolt 3 is locked to connect the battery stack body 4 to form a stable whole. At this time, the top of the battery stack body 4 abuts the elastic top pressing component 7, and the part inserted into the first positioning groove 5 and the second positioning groove 6 abuts the lateral elastic extrusion piece 8. When the battery stack body 4 expands due to the high temperature, the elastic top pressing component 7 and the lateral elastic extrusion piece 8 are further pressed to cause the elastic elements in the elastic top pressing component 7 and the lateral elastic extrusion piece 8 to contract, thereby securing the battery stack body 4. The size change of the body 4 provides size compensation, so that the change of the locking force received by the battery stack main body 4 is small, ensuring its performance stability. When the battery stack main body 4 shrinks after cooling, the principle is the same. At the same time, since the locking bolts 3 have locked the distance between the upper end plate 1 and the lower end plate 2, the overall size of the battery stack main body 4 and the upper end plate 1 and the lower end plate 2 will no longer change during the thermal expansion and contraction of the battery stack main body 4. Therefore, after the battery stack main body 4 using this connection structure is assembled and put into use, it will not squeeze the surrounding components due to temperature changes.

[0030] In one embodiment, the elastic top pressure assembly 7 includes a first elastic member 71 fixedly arranged at the four corners of the top surface of the first positioning groove 5 and a top pressure plate 72 fixedly arranged at the bottom of the first elastic member 71. With this design, the top pressure plate 72 abuts against the top surface of the battery stack body 4. When the battery stack body 4 expands due to heat, the top pressure plate 72 is pushed upward, and the top pressure plate 72 applies pressure to the first elastic member 71 to elastically contract, thereby achieving dimensional compensation for the battery stack body 4. Under the locking action of the locking bolt 3, the spacing between the upper end plate 1 and the lower end plate 2 does not change; when the battery stack body 4 cools and contracts, the principle is the same.

[0031] In one embodiment, the first elastic member 71 includes an upper plug post 711 and a lower plug post 712 that are movably plugged into each other, and a spring 713 that is sleeved on the outer sides of the upper plug post 711 and the lower plug post 712. The end plates of the upper plug post 711 and the lower plug post 712 are provided with an annular groove 9, and both ends of the spring 713 are clamped in the annular groove 9. With this design, the entirety formed by the plugging of the upper plug post 711 and the lower plug post 712 limits the deformation direction and amplitude of the spring 713, ensuring the stability of the spring 713 during telescopic deformation, and clamping both ends of the spring 713 in the annular groove 9 can prevent it from sliding during the telescopic deformation process.

[0032] In one embodiment, the lateral elastic extrusion member 8 includes a first extrusion assembly 81 disposed on the same side groove wall of the first positioning groove 5 and the second positioning groove 6 and a second extrusion assembly 82 disposed on the groove wall adjacent to the first extrusion assembly 81. The first extrusion assembly 81 includes a second elastic member 811 fixedly disposed on the groove wall and an extrusion plate 812 fixedly disposed at the telescopic end of the second elastic member 811. The second extrusion assembly 82 has the same structure as the first extrusion assembly 81. With this design, when the battery stack body 4 is heated and expanded, the first extrusion assembly 81 and the second extrusion assembly 82 are pushed to cause the elastic elements in the first extrusion assembly 81 and the second extrusion assembly 82 to contract, thereby achieving dimensional compensation for the battery stack body 4 in the horizontal direction, and preventing the battery stack body 4 from directly pressing against the side walls of the first positioning groove 5 and the second positioning groove 6, thereby causing damage to the battery stack body 4.

[0033] In one embodiment, the second elastic member 811 includes a spring pin 8111 penetrating the groove wall and a connection block 8112 fixedly disposed at the end of the pin head of the spring pin 8111, and the connection block 8112 is fixedly connected to the extrusion plate 812. With this design, the spring pin 8111 is connected to the extrusion plate 812 through the connection block 8112, so that the connection between the two is more stable. Since the pin head of the spring pin 8111 can be elastically retracted, the extrusion plate 812 connected to the pin head can move with the extension and retraction of the pin head, thereby providing size compensation for the battery stack body 4.

[0034] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

[0035] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0036] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or schemes that satisfy both A and B. In addition, "multiple" refers to more than two. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

Claims

1. A fuel cell stack integrated connection structure, comprising an upper end plate (1), a lower end plate (2) and a locking bolt (3) inserted between the upper end plate (1) and the lower end plate (2), wherein the bottom of the upper end plate (1) is provided with a first positioning groove (5) for clamping the top end of the battery stack body (4), and the top of the lower end plate (2) is provided with a second positioning groove (6) for clamping the bottom end of the battery stack body (4), characterized in that: Also includes: An elastic pressing component (7) is fixedly arranged on the top surface of the first positioning groove (5) and is used to press the upper end surface of the battery stack body (4); A lateral elastic extrusion member (8) is fixedly arranged on the side walls of the first positioning groove (5) and the second positioning groove (6), and is used to press the portion of the battery stack body (4) that is inserted into the first positioning groove (5) and the second positioning groove (6).

2. A fuel cell stack integrated connection structure as claimed in claim 1, characterized in that: The elastic pressing assembly (7) comprises a first elastic member (71) fixedly arranged at the four corners of the top surface of the first positioning groove (5) and a pressing plate (72) fixedly arranged at the bottom of the first elastic member (71).

3. A fuel cell stack integrated connection structure as claimed in claim 2, characterized in that: The first elastic member (71) comprises an upper plug post (711) and a lower plug post (712) which are movably plugged into each other, and a spring (713) which is sleeved on the outside of the upper plug post (711) and the lower plug post (712), and an annular groove (9) is provided on the end plates of the upper plug post (711) and the lower plug post (712), and both ends of the spring (713) are clamped in the annular groove (9).

4. A fuel cell stack integrated connection structure as claimed in claim 3, characterized in that: The lateral elastic extrusion member (8) comprises a first extrusion component (81) arranged on the same side groove wall of the first positioning groove (5) and the second positioning groove (6) and a second extrusion component (82) arranged on the groove wall adjacent to the first extrusion component (81); the first extrusion component (81) comprises a second elastic member (811) fixedly arranged on the groove wall and an extrusion plate (812) fixedly arranged at the telescopic end of the second elastic member (811); the second extrusion component (82) has the same structure as the first extrusion component (81).

5. A fuel cell stack integrated connection structure as claimed in claim 4, characterized in that: The second elastic member (811) comprises a spring pin (8111) penetrating the groove wall and a connecting block (8112) fixedly arranged at the pin head end of the spring pin (8111), and the connecting block (8112) is fixedly connected to the extrusion plate (812).

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