Stack assembly of fuel cell

Abstract

The invention discloses a cell stack assembly of a fuel cell. The cell stack assembly comprises a cell stack main body; the first pressing plate and the second pressing plate are opposite in the first direction and are spaced. The pull rod assembly comprises a fixing base, an elastic piece and a pull rod, the fixing base is located between the first pressing plate and the second pressing plate, one end of the pull rod is fixedly arranged on the second pressing plate, the other end of the pull rod extends into the fixing base, and the elastic piece is compressed between the fixing base and the pull rod to drive the pull rod to move towards the first pressing plate in the first direction. Through cooperation of the first pressing plate, the second pressing plate and the pull rod assembly, the elastic force of the elastic member in the pull rod assembly can drive the pull rod to drive the second pressing plate to move towards the first pressing plate, thereby facilitating proper compression of the cell stack main body, and automatically compensating compression loss caused by aging of the cell stack main body. And the compression load and rigidity of the cell stack main body are kept in a reasonable range, so that the sealing property and conductivity of the fuel cell are improved.

Description

Technical Field

[0001] The present invention relates to the field of electrochemical batteries, and in particular to a battery stack assembly. Background Art

[0002] In the related art, a compression assembly is used to compress a fuel cell stack. The fuel cell stack needs to maintain reasonable compression during its service life. The fuel cell stack will have compression loss due to aging of components, resulting in a reduction in the length of the stack, which leads to insufficient pressure on the stack. The method of using an existing compression assembly to compress the stack requires regular inspection and tightening of the compression assembly. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a fuel cell stack assembly that automatically compensates for the compression loss of the main body of the stack due to aging, so that the compression load and stiffness of the main body of the stack are maintained within a reasonable range.

[0004] According to an embodiment of the present invention, a battery stack assembly includes: a battery stack body; a first pressure plate and a second pressure plate, the first pressure plate and the second pressure plate are opposite and spaced apart along a first direction, and the battery stack body is arranged between the first pressure plate and the second pressure plate; a tie rod assembly, the tie rod assembly includes a fixed seat, an elastic member and a tie rod, the fixed seat is located between the first pressure plate and the second pressure plate and is fixed to the first pressure plate, one end of the tie rod is fixed to the second pressure plate, and the other end of the tie rod extends into the fixed seat, the elastic member is arranged in the fixed seat, and the elastic member is configured to be compressed between the fixed seat and the tie rod so as to be suitable for driving the tie rod to move along the first direction toward the first pressure plate.

[0005] According to the battery stack assembly of the embodiment of the present invention, through the cooperation of the first pressure plate, the second pressure plate and the pull rod assembly, the elastic force of the elastic member in the pull rod assembly can drive the pull rod to drive the second pressure plate to move toward the first pressure plate, which is beneficial for the battery stack body to maintain appropriate compression, automatically compensate for the compression loss of the battery stack body caused by aging, and keep the compression load and stiffness of the battery stack body within a reasonable range, thereby improving the sealing and conductivity of the fuel cell.

[0006] In some embodiments of the present invention, the fixed seat is annular to define an installation space, the pull rod includes a pull rod body and a limit plate, one end of the pull rod body is fixed to the second pressure plate, the limit plate is fixed to the other end of the pull rod body and is located in the installation space, the fixed seat has a first end wall along the first direction, the first end wall is located on the side of the limit plate close to the second pressure plate, and the elastic member is arranged between the limit plate and the first end wall.

[0007] In some embodiments of the present invention, the pull rod body passes through the first end wall.

[0008] In some embodiments of the present invention, the fixing seat along the first direction also has a second end wall, the second end wall is located on the side of the limiting plate close to the first pressure plate, and a guide rod is connected between the first end wall and the second end wall, and the guide rod extends along the first direction and passes through the limiting plate.

[0009] In some embodiments of the present invention, there are multiple guide rods, and the multiple guide rods are all penetrated by the limiting plate.

[0010] In some embodiments of the present invention, the elastic member is sleeved on the guide rod.

[0011] In some embodiments of the present invention, the fixing seat also has a connecting side wall, which is connected between the first end wall and the second end wall. The inner side wall of the connecting side wall has a limiting boss. The limiting boss is located on the side of the limiting plate close to the second pressure plate along the first direction, and the limiting boss is suitable for abutting against the limiting plate for limiting.

[0012] In some embodiments of the present invention, the fixing seat is connected to a fixing rod, and the fixing rod is fixed to the first pressing plate.

[0013] In some embodiments of the present invention, there are multiple tie rod assemblies, and the multiple tie rod assemblies are arranged around the battery stack body.

[0014] In some embodiments of the present invention, there are multiple elastic members, and the multiple elastic members are all compressed between the fixing seat and the pull rod.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 is a schematic structural diagram of a battery stack assembly according to an embodiment of the present invention;

[0018] Figure 2 2 is a schematic diagram of the structure of a tie rod assembly according to an embodiment of the present invention.

[0019] Reference numerals:

[0020] A battery stack assembly 100;

[0021] Battery stack body 1;

[0022] First pressing plate 2; second pressing plate 3;

[0023] Tie rod assembly 4

[0024] Fixed seat 41;

[0025] Installation space 411; first end wall 412; second end wall 413;

[0026] Connecting side wall 414; limiting boss 415;

[0027] Elastic member 42;

[0028] Tie rod 43;

[0029] Pull rod body 431; limit plate 432;

[0030] Guide rod 44;

[0031] Fixing rod 5. DETAILED DESCRIPTION

[0032] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0033] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Reference below Figure 1-Figure 2 A battery stack assembly 100 according to an embodiment of the present invention is described.

[0037] like Figure 1 and Figure 2 As shown, the battery stack assembly 100 according to an embodiment of the present invention includes: a battery stack body 1; a first pressure plate 2 and a second pressure plate 3, the first pressure plate 2 and the second pressure plate 3 are opposite and spaced apart along a first direction, and the battery stack body 1 is arranged between the first pressure plate 2 and the second pressure plate 3; a tie rod assembly 4, the tie rod assembly 4 includes a fixed seat 41, an elastic member 42 and a tie rod 43, the fixed seat 41 is located between the first pressure plate 2 and the second pressure plate 3 and is fixed to the first pressure plate 2, one end of the tie rod 43 is fixed to the second pressure plate 3, and the other end of the tie rod 43 extends into the fixed seat 41, the elastic member 42 is arranged in the fixed seat 41, and the elastic member 42 is configured to be compressed between the fixed seat 41 and the tie rod 43 so as to be suitable for driving the tie rod 43 to move toward the first pressure plate 2 along the first direction.

[0038] The battery stack assembly 100 includes a battery stack body 1, a first pressure plate 2, and a second pressure plate 3. The battery stack body 1 converts chemical energy into electrical energy and is the main part of the fuel cell. The first pressure plate 2 and the second pressure plate 3 are arranged relative to each other along a first direction. Figure 1 In the X direction, the first pressure plate 2 and the second pressure plate 3 are spaced apart along the first direction to form an assembly space between the first pressure plate 2 and the second pressure plate 3, and the battery stack body 1 is arranged in the assembly space between the first pressure plate 2 and the second pressure plate 3, and the first pressure plate 2 and the second pressure plate 3 are clamped at both ends of the battery stack body 1 along the first direction to achieve the effect that the first pressure plate 2 and the second pressure plate 3 can compress the battery stack body 1.

[0039] The battery stack assembly 100 may also include a tie rod assembly 4, which further includes a fixing seat 41, an elastic member 42 and a tie rod 43. The fixing seat 41 is located between the first pressing plate 2 and the second pressing plate 3, and the fixing seat 41 is fixedly connected to the first pressing plate 2. For example, the fixing seat 41 may be fixedly connected to the first pressing plate 2 by welding, or the fixing seat 41 may be fixedly connected to the first pressing plate 2 by screwing, but the present invention is not limited thereto. The fixing seat 41 may also be fixedly connected to the first pressing plate 2 by other means, as long as the fixing seat 41 is fixedly connected to the first pressing plate 2. One end of the tie rod 43 is fixedly arranged on the second pressing plate 3. For example, one end of the tie rod 43 may be fixedly connected to the second pressing plate 3 by welding, or one end of the tie rod 43 may be fixedly connected to the second pressing plate 3 by screwing, but the present invention is not limited thereto. One end of the tie rod 43 may also be fixedly connected to the second pressing plate 3 by other means, as long as one end of the tie rod 43 is fixedly connected to the second pressing plate 3. The other end of the pull rod 43 extends into the fixing seat 41, and the elastic member 42 is arranged in the fixing seat 41. The elastic member 42 is compressed between the fixing seat 41 and the pull rod 43. The elastic force of the elastic member 42 can drive the pull rod 43 to drive the second pressure plate 3 to move toward the first pressure plate 2 along the first direction, so that the distance between the first pressure plate 2 and the second pressure plate 3 is reduced to compress the battery stack body 1. The first pressure plate 2 and the second pressure plate 3 provide a compression load to the battery stack body 1, so that the compression load and stiffness of the battery stack body 1 are kept within a reasonable range. The elastic force of the elastic member 42 automatically compensates for the compression loss of the battery stack body 1 caused by aging, which is conducive to the battery stack body 1 to continue to maintain a suitable compression and stack length, thereby improving the sealing and conductivity of the fuel cell.

[0040] Specifically, the battery stack body 1 includes a plurality of fuel cells. Along the first direction, the battery stack body 1 is sandwiched between the first pressing plate 2 and the second pressing plate 3, the fixing seat 41 is fixed to the first pressing plate 2, one end of the pull rod 43 is fixed to the second pressing plate 3, the other end of the pull rod 43 extends into the fixing seat 41 and the elastic member 42 is compressed between the fixing seat 41 and the pull rod 43, when the battery stack body 1 causes compression loss due to aging of components, the length of the battery stack body 1 is reduced, the elastic force of the elastic member 42 is greater than the supporting force of the battery stack body 1 on the first pressing plate 2 and the second pressing plate 3, so that the elastic force of the elastic member 42 can drive the pull rod 43 to drive the second pressing plate 3 to move toward the first pressing plate 2 along the first direction, the distance between the first pressing plate 2 and the second pressing plate 3 is reduced, and the battery stack body 1 is compressed, and the compression load of the first pressing plate 2 and the second pressing plate 3 on the battery stack body 1 automatically compensates for the compression loss of the battery stack body 1 caused by aging, which is conducive to the battery stack body 1 continuously maintaining a suitable compression and stack length, thereby improving the sealing and conductivity of the fuel cell.

[0041] Therefore, through the cooperation of the first pressure plate 2, the second pressure plate 3 and the pull rod assembly 4, the elastic force of the elastic part 42 in the pull rod assembly 4 can drive the pull rod 43 to drive the second pressure plate 3 to move toward the first pressure plate 2, which is beneficial for the battery stack body 1 to maintain appropriate compression, automatically compensate for the compression loss of the battery stack body 1 caused by aging, and keep the compression load and stiffness of the battery stack body 1 within a reasonable range, thereby improving the sealing and conductivity of the fuel cell.

[0042] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the fixed seat 41 is annular to define an installation space 411, the pull rod 43 includes a pull rod body 431 and a limit plate 432, one end of the pull rod body 431 is fixed to the second pressure plate 3, the limit plate 432 is fixed to the other end of the pull rod body 431 and is located in the installation space 411, and the fixed seat 41 has a first end wall 412 along the first direction, the first end wall 412 is located on the side of the limit plate 432 close to the second pressure plate 3, and the elastic member 42 is arranged between the limit plate 432 and the first end wall 412.

[0043] The fixing seat 41 is annular, and the annular fixing seat 41 can define an installation space 411. One end of the pull rod 43 extends into the installation space 411 of the fixing seat 41, and the elastic member 42 is assembled in the installation space 411, and the elastic member 42 is compressed between the fixing seat 41 and the pull rod 43. The pull rod 43 may include a pull rod body 431 and a limit plate 432. One end of the pull rod body 431 is fixedly arranged on the second pressing plate 3. For example, one end of the pull rod body 431 can be fixedly connected to the second pressing plate 3 by welding, and one end of the pull rod body 431 can also be fixedly connected to the second pressing plate 3 by screwing, but the present invention is not limited thereto. One end of the pull rod body 431 can also be fixedly connected to the second pressing plate 3 by other means, as long as one end of the pull rod body 431 is fixedly connected to the second pressing plate 3. The limiting plate 432 is fixedly arranged at the other end of the pull rod body 431. For example, the limiting plate 432 can be fixedly connected to the other end of the pull rod body 431 by welding, or the limiting plate 432 can be fixedly connected to the other end of the pull rod body 431 by screwing, but the present invention is not limited thereto. The limiting plate 432 can also be fixedly connected to the other end of the pull rod body 431 by other means, as long as the limiting plate 432 is fixedly connected to the other end of the pull rod body 431. The limiting plate 432 is located in the installation space 411 of the fixing seat 41. The fixing seat 41 has a first end wall 412 along the first direction. The first end wall 412 is located on the side of the limiting plate 432 close to the second pressing plate 3. The elastic member 42 is compressed and arranged between the limiting plate 432 and the first end wall 412 to achieve the effect that the elastic member 42 drives the limiting plate 432 to drive the second pressing plate 3 to move toward the first pressing plate 2, thereby facilitating the battery stack body 1 to maintain a suitable compression and stack length, and improving the sealing and conductivity of the fuel cell.

[0044] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the pull rod body 431 passes through the first end wall 412 .

[0045] Among them, the first end wall 412 can be provided with a through hole, and the pull rod body 431 can be inserted into the through hole. The cross-sectional shape of the pull rod body 431 can be circular, and the shape of the through hole is set to be circular accordingly, but the present invention is not limited to this. As long as the shape of the through hole is compatible with the pull rod body 431, the pull rod body 431 is inserted into the first end wall 412, which is conducive to the limit plate 432 driving the pull rod body 431 to move along the first direction in the through hole of the first end wall 412, and then driving the second pressure plate 3 to move along the first direction toward the first pressure plate 2, thereby reducing the distance between the first pressure plate 2 and the second pressure plate 3, compensating for the compression loss of the battery stack body 1 caused by aging, and keeping the compression load and stiffness of the battery stack body 1 within a reasonable range.

[0046] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the fixing seat 41 along the first direction also has a second end wall 413, and the second end wall 413 is located on the side of the limiting plate 432 close to the first pressure plate 2. A guide rod 44 is connected between the first end wall 412 and the second end wall 413, and the guide rod 44 extends along the first direction and passes through the limiting plate 432.

[0047] The fixing seat 41 in the first direction also has a second end wall 413, which is located on the side of the limiting plate 432 close to the first pressing plate 2. The first end wall 412 and the second end wall 413 are arranged opposite to each other and are respectively located on both sides of the fixing seat 41 in the first direction. A guide rod 44 is fixedly connected between the first end wall 412 and the second end wall 413. The guide rod 44 extends in the first direction and is inserted through the limiting plate 432. The guide rod 44 has a guiding function. In the installation space 411, the guide rod 44 mainly guides the limiting plate 432. When the elastic member 42 drives the limiting plate 432 to move toward the first pressing plate 2, the limiting plate 432 can move relatively accurately in the first direction under the guiding function of the guide rod 44, thereby reducing the risk of the second pressing plate 3 being offset due to the angular offset of the limiting plate 432. This reduces the risk of poor conductivity caused by uneven compression load on the battery stack body 1, which is beneficial to the working reliability of the battery stack body 1.

[0048] In some embodiments of the present invention, Figure 2 As shown, there are multiple guide rods 44 , and the multiple guide rods 44 are all penetrated by the limiting plate 432 .

[0049] Among them, the guide rod 44 can be set to be multiple, and the guide rod 44 can be set to be 2, 3, 4 or more. The present application takes the guide rod 44 being set to 4 as an example for explanation. Multiple guide rods 44 are all penetrated through the limit plate 432. When one of the guide rods 44 breaks, the other guide rods 44 can continue to play a guiding role, which is conducive to the guide rod 44 to reliably play a guiding role. Moreover, the four guide rods 44 are symmetrically arranged on both sides of the pull rod body 431, which can improve the working stability of the limit plate 432, thereby reducing the risk of angle deviation of the limit plate 432.

[0050] In some embodiments of the present invention, Figure 2 As shown, the elastic member 42 is sleeved on the guide rod 44 .

[0051] Among them, the elastic member 42 is sleeved on the guide rod 44, and the guide rod 44 can play a supporting role for the elastic member 42 to a certain extent, so that the elastic force of the elastic member 42 is always maintained in the first direction, reducing the risk of bending of the elastic member 42 due to compression, avoiding interference between multiple elastic members 42, thereby reducing the risk of elastic failure of the elastic member 42 due to lack of support, which is beneficial to the working reliability of the elastic member 42, and can continuously drive the limit plate 432 to drive the second pressure plate 3 to move toward the first pressure plate 2, compensate for the compression loss of the battery stack main body 1 caused by aging, keep the compression load and stiffness within a reasonable range, and improve the sealing and conductivity of the fuel cell.

[0052] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the fixing seat 41 also has a connecting side wall 414, which is connected between the first end wall 412 and the second end wall 413. The inner side wall of the connecting side wall 414 has a limiting boss 415. The limiting boss 415 is located on the side of the limiting plate 432 close to the second pressure plate 3 along the first direction. The limiting boss 415 is suitable for abutting against the limiting plate 432 for limiting.

[0053] The fixing seat 41 further comprises a connecting side wall 414, which can be provided with two connecting side walls 414, which are arranged opposite to each other and spaced apart, and which are connected between the first end wall 412 and the second end wall 413. The two connecting side walls 414, the first end wall 412 and the second end wall 413 together form an annular fixing seat 41. The inner side wall of the connecting side wall 414 comprises a limiting boss 415, and along the first direction, the limiting boss 415 is located on the side of the limiting plate 432 close to the second pressing plate 3, and the limiting boss 415 is abutted against the limiting plate 432 to limit the position, which can reduce the risk of the limiting plate 432 over-compressing the elastic member 42 toward the second pressing plate 3, thereby reducing the risk of failure of the elastic member 42, and further facilitating the working reliability of the elastic member 42.

[0054] In some embodiments of the present invention, Figure 2 As shown, the fixing seat 41 is connected to a fixing rod 5 , and the fixing rod 5 is fixed to the first pressing plate 2 .

[0055] Among them, the fixing seat 41 is connected with a fixing rod 5, and the fixing rod 5 is fixedly arranged between the second end wall 413 of the fixing seat 41 and the first pressing plate 2. The fixing rod 5 can be fixedly connected between the second end wall 413 and the first pressing plate 2 by welding, or fixedly connected between the second end wall 413 and the first pressing plate 2 by screwing, but the present application is not limited thereto, and the fixing rod 5 can also be fixedly connected between the second end wall 413 and the first pressing plate 2 by other means, as long as the fixing rod 5 is fixedly arranged between the second end wall 413 and the first pressing plate 2. Such a setting is conducive to stably fixing the fixing seat 41 on the first pressing plate 2 through the fixing rod 5, reducing the risk of damage to components in the installation space 411 caused by displacement of the fixing seat 41, improving the working reliability of the tie rod assembly 4, and thus facilitating the normal operation of the fuel cell.

[0056] In some embodiments of the present invention, Figure 1 As shown, there are multiple tie rod assemblies 4 , and the multiple tie rod assemblies 4 are arranged around the battery stack body 1 .

[0057] Among them, there are multiple tie rod assemblies 4, and the tie rod assemblies 4 can be set to 2, 3, 4, 6, 8 or more. The present application takes the example of 8 tie rod assemblies 4. Multiple tie rod assemblies 4 are evenly arranged around the battery stack body 1. When one of the tie rod assemblies 4 fails, the other tie rod assemblies 4 can continue to drive the tie rod 43 to drive the second pressure plate 3 to move toward the first pressure plate 2, automatically compensating for the compression loss of the battery stack body 1 caused by aging, so that the compression load and stiffness are maintained within a reasonable range, thereby improving the reliability of the tie rod assembly 4 and ensuring the normal operation of the fuel cell.

[0058] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, there may be a plurality of elastic members 42 , and the plurality of elastic members 42 are all compressed between the fixing seat 41 and the pull rod 43 .

[0059] Among them, there can be multiple elastic members 42, and multiple elastic members 42 are compressed between the fixing seat 41 and the pull rod 43. The elastic members 42 can be set to 2, 4 or 6. This application takes the elastic members 42 set to 4 as an example for explanation. When one of the elastic members 42 fails, the other elastic members 42 can continue to play a driving role, which is conducive to the elastic member 42 to reliably play a driving role. In addition, the four elastic members 42 are symmetrically arranged on both sides of the pull rod body 431, which can improve the working stability of the limit plate 432, thereby reducing the risk of angular deviation of the limit plate 432. The elastic force of multiple elastic members 42 automatically compensates for the compression loss of the battery stack body 1 due to aging, which is conducive to the battery stack body 1 to continue to maintain a suitable compression and stack length, thereby further improving the sealing and conductivity of the fuel cell.

[0060] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0061] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A fuel cell stack assembly, characterized in that: include: Battery stack body; a first pressing plate and a second pressing plate, the first pressing plate and the second pressing plate being opposite to each other and spaced apart along a first direction, and the battery stack body being disposed between the first pressing plate and the second pressing plate; A pull rod assembly, the pull rod assembly comprising a fixed seat, an elastic member and a pull rod, the fixed seat is located between the first pressure plate and the second pressure plate and is fixed to the first pressure plate, one end of the pull rod is fixed to the second pressure plate, and the other end of the pull rod extends into the fixed seat, the elastic member is arranged in the fixed seat, and the elastic member is configured to be compressed between the fixed seat and the pull rod so as to drive the pull rod to move along the first direction toward the first pressure plate.

2. The fuel cell stack assembly of claim 1, wherein: The fixing seat is annular to define an installation space, the pull rod includes a pull rod body and a limit plate, one end of the pull rod body is fixed to the second pressure plate, the limit plate is fixed to the other end of the pull rod body and is located in the installation space, the fixing seat has a first end wall along the first direction, the first end wall is located on the side of the limit plate close to the second pressure plate, and the elastic member is arranged between the limit plate and the first end wall.

3. The fuel cell stack assembly of claim 2, wherein: The pull rod body is disposed through the first end wall.

4. The fuel cell stack assembly of claim 2, characterized in that: The fixing seat also has a second end wall along the first direction, the second end wall is located on the side of the limiting plate close to the first pressure plate, a guide rod is connected between the first end wall and the second end wall, and the guide rod extends along the first direction and passes through the limiting plate.

5. The fuel cell stack assembly of claim 4, characterized in that: There are multiple guide rods, and the multiple guide rods are all penetrated through the limiting plate.

6. The fuel cell stack assembly of claim 4, characterized in that: The elastic member is sleeved on the guide rod.

7. The fuel cell stack assembly of claim 4, characterized in that: The fixing seat also has a connecting side wall, which is connected between the first end wall and the second end wall. The inner side wall of the connecting side wall has a limiting boss. Along the first direction, the limiting boss is located on the side of the limiting plate close to the second pressure plate. The limiting boss is suitable for abutting against the limiting plate for limiting.

8. The fuel cell stack assembly of claim 1, characterized in that: The fixing seat is connected with a fixing rod, and the fixing rod is fixed to the first pressing plate.

9. The fuel cell stack assembly of any one of claims 1 to 8, characterized in that: There are a plurality of tie rod assemblies, and the plurality of tie rod assemblies are arranged around the battery stack body.

10. The fuel cell stack assembly of any one of claims 1 to 8, characterized in that: There are multiple elastic members, and all of the multiple elastic members are compressed between the fixing seat and the pull rod.

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