Connecting piece, electric pile fixing assembly and fuel cell pile

Abstract

The utility model provides a connecting piece, stack fixing subassembly and fuel cell stack, connecting piece includes first pole body, second pole body and elastic piece, first pole body and second pole body are coaxial setting, first pole body one end facing the second pole body is equipped with first connecting portion, second pole body one end facing the first pole body is equipped with second connecting portion, the elastic piece is equipped with second connecting portion. A first abutting part is arranged at the end, away from the first rod body, of the first connecting part, a second abutting part is arranged at the end, away from the second rod body, of the second connecting part, the first connecting part penetrates through the second abutting part, the elastic piece is clamped between the first abutting part and the second abutting part, and the first rod body and the second rod body can slide away from each other and compress the elastic piece. According to the connecting piece, stored energy is released through the elastic piece to drive the first rod body and the second rod body to drive the two components to slide in the direction close to each other, the distance between the two components can be adjusted easily, and therefore the clamping and fixing effect of the two components on parts between the two components can be improved easily.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cells, and in particular to a connector. At the same time, the utility model also relates to a fuel cell stack fixing assembly provided with the connector, and a fuel cell stack. Background Art

[0002] The stack shell and the core are assembled together by tie rods and screws to form a fuel cell stack. Since the hydrogen fuel cell industry is still in the development stage, the safety of the fuel cell stack is particularly important. It is particularly necessary to avoid the core misalignment of the fuel cell stack during vehicle operation and reduce the risk of sealing failure.

[0003] The core is formed by pressing the bipolar plates and membrane electrodes, and the tie rods are only fixedly connected to the end plates on both sides of the core. However, the sealing structure between the bipolar plates and the membrane electrodes in the core will be at risk of aging, so that when the thickness of the core is reduced, the distance between the two end plates cannot adapt to the thickness of the core, making the core prone to deformation when stimulated by external loads.

[0004] In addition, two spaced components are connected by conventional screws. When the thickness of the component between the two components decreases, the nut on the screw needs to be manually screwed to ensure the clamping effect of the two components on the component between them. The nut needs to be tightened manually at regular intervals, which is inconvenient to operate and has low adjustment efficiency. Utility Model Content

[0005] In view of this, the utility model aims to provide a connecting piece to facilitate adjusting the distance between two components and to improve the clamping effect of the parts between the two components.

[0006] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0007] A connecting member comprises a first rod body, a second rod body and an elastic member, wherein the first rod body and the second rod body are coaxially arranged, a first connecting portion is arranged at one end of the first rod body facing the second rod body, a second connecting portion is arranged at one end of the second rod body facing the first rod body, a first abutting portion is arranged at one end of the first connecting portion facing away from the first rod body, a second abutting portion is arranged at one end of the second connecting portion facing away from the second rod body, the first connecting portion passes through the second abutting portion, the elastic member is clamped between the first abutting portion and the second abutting portion, and the first rod body and the second rod body can slide away from each other and compress the elastic member.

[0008] Furthermore, the first connecting portion includes a connecting column extending along the axial direction of the first rod body;

[0009] The first abutment portion includes a blocking block provided at one end of the connecting column;

[0010] The second connecting portion includes a connecting block extending along the axial direction of the second rod body, the connecting block penetrates the blocking block and is slidably connected to the blocking block, the second abutting portion includes a protrusion protruding outwardly from the connecting block along the radial direction of the second rod body, and the elastic member is sandwiched between the blocking block and the protrusion. Further, the first connecting portion includes a connecting column extending along the axial direction of the first rod body; the first abutting portion includes a blocking block provided at one end of the connecting column;

[0011] The second connecting portion includes a sliding cavity extending axially along the second rod body, the second abutting portion includes an abutting block provided in the sliding cavity slot and extending radially, and the elastic member is sleeved on the connecting column and clamped between the blocking block and the abutting block.

[0012] Further, the elastic member is sleeved on the connecting column or the connecting block, and two ends of the elastic member are respectively abutted between the blocking block and the protrusion; and / or,

[0013] The connecting columns are multiple and are arranged at intervals along the circumference of the first rod body, and each of the connecting columns is connected to the blocking block.

[0014] Furthermore, the connecting block is detachably connected to the second rod body; and / or,

[0015] The two ends of the connecting column are provided with thread segments with opposite thread directions, and the connecting column is respectively threadedly connected to the first rod body and the blocking block through the thread segments at the two ends.

[0016] Furthermore, an insulating layer is provided on the outer surface of the first rod body and / or the second rod body.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] The connecting piece described in the utility model is provided with a first connecting portion on the first rod body passing through the second abutting portion on the second rod body, and the elastic member is clamped between the first abutting portion on the first rod body and the second abutting portion on the second rod body, and the first rod body and the second rod body can slide away from each other and compress the elastic member, which is beneficial to improving the clamping and fixing effect of the two components on the parts between them, and when the thickness of the parts between the two components becomes smaller, the compressed elastic member releases the stored energy and drives the first rod body and the second rod body to slide in the direction of approaching each other, which is beneficial to adjusting the distance between the two components and improving the clamping and fixing effect of the two components on the parts between them.

[0019] In addition, another object of the utility model is to provide a battery stack fixing assembly, comprising two end plates arranged at intervals, the two end plates being connected by the connecting piece as described above, and a placement space for placing the battery stack unit is formed between the two end plates.

[0020] The battery stack fixing assembly described in the present invention enables the connecting piece as described above to be connected between the two end plates, and forms a placement space for placing the battery stack unit between the two end plates, which is beneficial to improving the fixing effect of the battery stack unit.

[0021] In addition, the utility model also proposes a fuel cell stack, including the fuel cell stack fixing assembly as described above, and a fuel cell stack unit arranged between the two end plates.

[0022] The fuel cell stack described in the present invention helps to improve the fixing effect of the stack unit between the two end plates by arranging the above-mentioned connecting piece between the two end plates, thereby helping to improve the performance of the fuel cell stack. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative 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 accompanying drawings:

[0024] Figure 1 This is a schematic structural diagram of the connecting piece described in Embodiment 1 of the present utility model;

[0025] Figure 2 This is a partial structural schematic diagram of the connecting piece described in Embodiment 1 of the utility model;

[0026] Figure 3 This is a schematic structural diagram of the first rod body according to the first embodiment of the present utility model;

[0027] Figure 4 This is a schematic structural diagram of the second rod body according to the first embodiment of the present utility model;

[0028] Figure 5 This is a schematic diagram of the structure of the connecting column and the blocking block according to the first embodiment of the utility model;

[0029] Figure 6 This is a structural schematic diagram of the connection block according to the first embodiment of the utility model;

[0030] Figure 7 This is a schematic diagram of the structure of the protrusion and the sliding cavity described in the first embodiment of the utility model;

[0031] Figure 8 This is a schematic structural diagram of the end plate and the connecting member in a connected state according to the second embodiment of the present utility model;

[0032] Fig. 9 This is a schematic diagram of the structure of the bipolar plate described in Example 2 of the present utility model.

[0033] Description of reference numerals:

[0034] 1. First rod body; 2. Second rod body; 3. Elastic member; 4. First end plate; 5. Second end plate; 6. Side plate; 7. Bipolar plate;

[0035] 100, connecting member; 101, first connecting portion; 102, first abutting portion;

[0036] 201, second connecting portion; 202, second abutting portion; 203, sliding cavity; 204, abutting block; 205, connecting hole;

[0037] 701. Through hole. DETAILED DESCRIPTION

[0038] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0039] In the description of the present invention, it should be noted that if there are terms indicating orientation or positional relationship such as "upper", "lower", "inner", "back", etc., they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first", "second", etc., they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0040] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0041] Embodiment 1

[0042] The present embodiment relates to a connecting member 100, comprising a first rod body 1, a second rod body 2 and an elastic member 3. The first rod body 1 and the second rod body 2 are coaxially arranged, a first connecting portion 101 is arranged at one end of the first rod body 1 facing the second rod body 2, and a second connecting portion 201 is arranged at one end of the second rod body 2 facing the first rod body 1.

[0043] A first abutting portion 102 is provided at one end of the first connecting portion 101 away from the first rod body 1, and a second abutting portion 202 is provided at one end of the second connecting portion 201 away from the second rod body 2. The first connecting portion 101 passes through the second abutting portion 202, and the elastic member 3 is clamped between the first abutting portion 102 and the second abutting portion 202. The first rod body 1 and the second rod body 2 can slide away from each other and compress the elastic member 3.

[0044] The connecting member 100 described in this embodiment is provided with a first connecting portion 101 on the first rod body 1 passing through the second abutting portion 202 on the second rod body 2, and the elastic member 3 is clamped between the first abutting portion 102 and the second abutting portion 202, and the first rod body 1 and the second rod body 2 can slide away from each other and compress the elastic member 3, which is beneficial to improve the clamping and fixing effect of the two components on the components between them, and when the thickness of the components between the two components becomes smaller, the compressed elastic member 3 releases the stored energy and drives the first rod body 1 and the second rod body 2 to slide in a direction close to each other, which is beneficial to adjust the distance between the two components and improve the clamping and fixing effect of the two components on the components between them.

[0045] Based on the above overall introduction, an exemplary structure of the connecting member 100 described in this embodiment is as follows: Figure 1 and Figure 2 As shown in . The first rod body 1 and the second rod body 2 are coaxially arranged, and one end of the second rod body 2 is slidably arranged at the corresponding end of the first rod body 1. The two components in this embodiment can be, for example, end plates located at both ends of the battery stack unit, and the component between the two end plates can be the battery stack unit. The two end plates are connected by a connector 100, so that the battery stack unit is fixed between the two end plates.

[0046] When the thickness of the battery stack unit becomes smaller due to aging, the elastic member 3 drives the first rod body 1 and the second rod body 2 to slide towards each other, which can drive the two end plates to have a tendency to approach each other, so that the two end plates always apply a clamping force to the battery stack unit, thereby maintaining the clamping and fixing effect of the battery stack unit between the two end plates.

[0047] Therefore, compared with the traditional solution where the nut needs to be manually screwed on the screw, the connecting piece in this embodiment can automatically adjust the distance between the two end plates under the cooperation of the first rod body 1, the second rod body 2 and the elastic member 3, thereby maintaining the clamping effect on the battery stack unit.

[0048] Of course, the components and parts can also be other products that meet the use requirements. For the convenience of the following description, the ends of the first rod body 1 and the second rod body 2 connected to each other are called the inner ends of the two, and the ends of the first rod body 1 and the second rod body 2 connected to the components are called the outer ends of the two.

[0049] In some embodiments, Figure 2 and Figure 3As shown in the figure, the first connecting part 101 includes a connecting column extending along the axial direction of the first rod body 1, and the first abutting part 102 includes a blocking block provided at the other end of the connecting column. The second connecting part 201 includes a connecting block extending along the axial direction of the second rod body 2, the connecting block penetrates the blocking block and is slidably connected to the blocking block. The second abutting part 202 includes a protrusion provided along the radial direction of the second rod body 2 and protruding from the connecting block, and the elastic member 3 is sandwiched between the blocking block and the protrusion.

[0050] Here, the connecting column is arranged at the inner end of the first rod body 1, and the connecting block is arranged at the inner end of the second rod body 2. The connecting column, the connecting block and the blocking block have simple structures and are easy to arrange and implement. The elastic member 3 is sandwiched between the blocking block and the protrusion, which not only facilitates the arrangement of the elastic member 3, but also helps to improve the stability of the elastic member 3 during use.

[0051] like Figure 3 and Figure 5 As shown in the figure, the connection posts in this embodiment are arranged at intervals along the circumference of the first rod body 1, and each connection post is connected to the blocking block. The connection block includes a rod body inserted in the blocking block, and a protrusion protruding radially outward from the rod body, and the connection block is slidably connected to each connection post through the protrusion. Here, by setting multiple connection posts through the protrusion, it is beneficial to further improve the stability of the first rod body 1 and the second rod body 2 in relative sliding.

[0052] Among them, Figure 4 and Figure 6 As shown in , the protrusion is provided with a connection hole 205 for each connection column to pass through. The annular blocking block is not only conducive to the connection on multiple connection columns, but also can form a space for the rod body to pass through, so that it can cooperate with the rod body to guide the sliding of the second rod body 2.

[0053] Here, the protrusions are slidably arranged on the plurality of connecting posts, which is also beneficial to preventing the second rod body 2 from rotating relative to the first rod body 1, and further beneficial to improving the stability of the connecting member 100 during use. In this embodiment, the blocking block is annular, and the arrangement of the rod body and the protrusion in the connecting block has the advantages of being easy to process and shape, and having good use effect.

[0054] In order to further improve the use effect of the elastic member 3, as Figure 5 As shown in , each connecting column is sleeved with an elastic member 3. Specifically, the elastic member 3 is a spring sleeved on the connecting column and sandwiched between the blocking block and the protrusion. The product is mature, the structure is simple, the arrangement is convenient, and it is helpful to adjust the distance between the two components. Of course, the elastic member 3 can also be sleeved on the rod body and sandwiched between the blocking block and the protrusion.

[0055] In order to facilitate replacement and maintenance of the connection block, the connection block in this embodiment is detachably connected to the second rod body 2. Specifically, the free end of the rod body is provided with a first threaded section, and the end surface of the inner end of the second rod body 2 is provided with a first threaded hole that is threadedly matched with the first threaded section. Here, the connection block is threadedly connected to the second rod body 2, which has the advantage of being easy to install and disassemble. Of course, in addition to being connected to the inner end of the second rod body 2 by threading, the connection block can also be connected to the second rod body 2 by other methods, as long as the connection requirements are met.

[0056] As a preferred embodiment, the two ends of the connecting column are provided with threaded sections with opposite thread directions, and the connecting column is respectively connected to the first rod body 1 and the blocking block by threading through the threaded sections at the two ends. For ease of description, the threaded section connected to the inner end of the first rod body 1 is referred to as the second threaded section, and the threaded section connected to the blocking block is referred to as the third threaded section. The inner end of the first rod body 1 is provided with a second threaded hole threadedly connected to the second threaded section, and the blocking block is provided with a third threaded hole threadedly connected to the third threaded section.

[0057] In addition, the connection column is detachably connected to the blocking block and the first rod body 1, which also facilitates the sliding setting of the protrusion on the connecting block on the connection column, so that the protrusion is located between the blocking block and the inner end of the first rod body 1.

[0058] It should be noted that, in this embodiment, the elastic member 3 is not only located between the blocking block and the protrusion of the connecting block, but also can be located between the blocking block and the second rod 2, or between the protrusion of the connecting block and the first rod 1. In this way, the spacing between the two components can be adjusted by the cooperation between the elastic member 3 and the first rod 1 and the second rod 2, and the two components can have a better connection effect.

[0059] In other embodiments, Figure 7 As shown in the figure, the first connecting part 101 still includes a connecting column extending along the axial direction of the first rod body 1. The first abutting part 102 includes a blocking block provided at one end of the connecting column. The second connecting part 201 includes a sliding cavity 203 extending along the axial direction of the second rod body 2, and the second abutting part 202 includes an abutting block 204 provided in the notch of the sliding cavity 203 and extending in the radial direction. The elastic member 3 is sleeved on the connecting column and sandwiched between the blocking block and the abutting block 204.

[0060] The elastic member 3 is sleeved on the connecting column and sandwiched between the blocking block and the abutment block 204, which is conducive to improving the use stability of the elastic member 3. The abutment block 204 can abut against the blocking block, thereby ensuring the insertion and sliding effect between the first rod body 1 and the second rod body 2, and preventing the first rod body 1 and the second rod body 2 from separating.

[0061] To ensure the stability of the second rod body 2 during sliding, the cross-sections of the sliding cavity 203 and the protrusion can also be non-circular, for example, the cross-sections of both are square or rectangular, etc. This helps prevent the second rod body 2 from rotating relative to the first rod body 1, and has a simple structure and is easy to process and form.

[0062] In order to facilitate the connection of the connector 100 with the two components, as a preferred connection method, the first rod body 1 and the second rod body 2 are both provided with a connecting portion, and the connecting portion is used to be screwed and connected to the component. Here, the connecting portion is screwed and connected to the component, which has the advantage of convenient loading and unloading operations. Specifically, the connecting portion on the first rod body 1 is a fourth threaded segment provided at the outer end of the first rod body 1, and the connecting portion on the second rod body 2 is a fifth threaded segment provided at the outer end of the second rod body 2.

[0063] During specific installation, a fourth threaded hole can be provided on one component, and a mounting hole for the fifth threaded segment to pass through can be provided on the other component. The fourth threaded segment on the first rod body 1 is screwed to the fourth threaded hole to realize the connection with the corresponding component, and the fifth threaded segment on the second rod body 2 can be connected to the nut after passing through the mounting hole, thereby realizing the connection between the two components.

[0064] In addition, an insulating layer is provided on the outer surface of the first rod body 1 and the second rod body 2. The insulating layer here may include an electrophoretic layer formed on the first rod body 1 and the second rod body 2 by electrophoresis. Further, in order to prevent the electrophoretic layer treated by electrophoresis from being damaged, the insulating layer in this embodiment also includes a rubber layer wrapped outside the electrophoretic layer. Of course, the insulating layer can also be directly wrapped outside the first rod body 1 and the second rod body 2 without providing an electrophoretic layer, and in this case, a good insulating effect is also achieved.

[0065] It should be noted that the solution of only providing an insulating layer on the first rod body 1 or the second rod body 2 is also feasible. When it is implemented specifically, it can be determined according to the use requirements. In this embodiment, each elastic member 3 is in a maximum compression state in the initial connection state. When the distance between the two components becomes smaller, the elastic member 3 stretches and pushes the first rod body 1 and the second rod body 2 to slide in a direction close to each other, which can drive the two components to slide in a direction close to each other, so that the two components can clamp and fix the components located between them, so that the distance between the two components and the thickness of the components are adapted, and it is beneficial to ensure the connection effect between the two components.

[0066] Embodiment 2

[0067] The present embodiment relates to a battery stack fixing assembly, comprising two end plates arranged at intervals, the two end plates being connected via the connector 100 described in the first embodiment, and a placement space for placing the battery stack unit is formed between the two end plates.

[0068] Benru Figure 8 For the convenience of distinguishing the description, Figure 7 The end plate on the right side is called the first end plate 4, and the end plate on the left side is called the second end plate 5. Preferably, the connecting piece 100 is arranged in a plurality along the circumference of the battery stack unit, which is conducive to improving the fixing effect between the first end plate 4 and the second end plate 5 of the battery stack unit. In terms of specific structure, the fourth threaded hole is arranged on the first end plate 4, and the mounting hole is arranged on the second end plate 5. Among them, the joint surface between the nut and the second end plate 5 is provided with sealant, which is conducive to improving the sealing effect of the connection and meeting the sealing requirements.

[0069] The battery stack fixing assembly of this embodiment connects the connecting piece 100 as described above between the two end plates, and forms a placement space for placing the battery stack unit between the two end plates, which is beneficial to improving the fixing effect of the battery stack unit.

[0070] In addition, the present embodiment also relates to a fuel cell stack, including the fuel cell stack fixing assembly as described above, and a fuel cell stack unit disposed between two end plates.

[0071] The stack unit includes a plurality of bipolar plates 7 and membrane electrodes which are alternately stacked. Fig. 9 As shown in , each bipolar plate 7 is provided with a through hole 701 for the connector 100 to pass through. In this way, the connector 100 is simultaneously subjected to the gravity of the bipolar plate 7 and the membrane electrode, etc. When the bipolar plate 7 and the membrane electrode are subjected to external loads, they are subjected to the friction between the connector 100 and the bipolar plate 7, which is beneficial to reduce the deformation of the battery stack unit and play the effect of protecting the battery stack unit.

[0072] Preferably, a buffer layer may be provided between the battery stack unit and at least one of its end plates, and the buffer layer here may also protect the battery stack unit. Considering that the first end plate 4 is arranged downward to support the battery stack unit, the buffer layer may be provided between the first end plate 4 and the battery stack unit. Of course, it is also feasible to provide a buffer layer between the second end plate 5 and the battery stack unit. In specific implementation, the buffer layer may also be made of products with a buffering effect such as rubber.

[0073] After the connector 100 in this embodiment connects the first end plate 4, the second end plate 5 and the stack unit, side plates 6 can be respectively arranged around the first end plate 4 and the second end plate 5, so that the stack unit is in a closed space through the cooperation of the end plate and the side plates 6. The side plates 6 are bonded to each end plate to meet the sealing requirements.

[0074] When the sealing structure in the battery stack unit ages and the thickness of the battery stack unit becomes smaller, the elastic member 3 releases the stored energy to push the second rod body 2 and the first rod body 1 to slide toward each other, thereby shortening the distance between the two connecting parts and bringing the two end plates closer to each other, thereby maintaining the clamping effect on the battery stack unit and preventing the battery stack unit from deformation.

[0075] The fuel cell stack in this embodiment is advantageously prevented from deformation of the stack unit by disposing the above-mentioned connecting member 100 between the two end plates, thereby advantageously ensuring the performance and safety of the fuel cell stack.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A connector, characterized in that: The invention comprises a first rod body (1), a second rod body (2) and an elastic member (3); the first rod body (1) and the second rod body (2) are coaxially arranged; a first connecting portion (101) is arranged at one end of the first rod body (1) facing the second rod body (2); a second connecting portion (201) is arranged at one end of the second rod body (2) facing the first rod body (1); a first abutting portion (102) is arranged at one end of the first connecting portion (101) facing away from the first rod body (1); a second abutting portion (202) is arranged at one end of the second connecting portion (201) facing away from the second rod body (2); the first connecting portion (101) is inserted into the second abutting portion (202); the elastic member (3) is sandwiched between the first abutting portion (102) and the second abutting portion (202); the first rod body (1) and the second rod body (2) can slide away from each other and compress the elastic member (3).

2. The connector according to claim 1, characterized in that: The first connecting portion (101) comprises a connecting column extending axially along the first rod body (1); The first abutment portion (102) comprises a blocking block provided at one end of the connecting column; The second connecting portion (201) comprises a connecting block extending axially along the second rod body (2), the connecting block passing through the blocking block and being slidably connected to the blocking block, the second abutting portion (202) comprises a protrusion protruding radially outward from the connecting block along the second rod body (2), and the elastic member (3) is sandwiched between the blocking block and the protrusion.

3. The connector according to claim 1, characterized in that: The first connecting portion (101) comprises a connecting column extending axially along the first rod body (1); the first abutting portion (102) comprises a blocking block provided at one end of the connecting column; The second connecting portion (201) comprises a sliding cavity (203) extending axially along the second rod body (2); the second abutting portion (202) comprises an abutting block (204) provided in a notch of the sliding cavity (203) and extending radially; the elastic member (3) is sleeved on the connecting column and clamped between the blocking block and the abutting block (204).

4. The connector according to claim 2, characterized in that: The elastic member (3) is sleeved on the connecting column or the connecting block, and two ends of the elastic member (3) are respectively abutted between the blocking block and the protrusion; and / or, The connecting columns are multiple and are arranged at intervals along the circumference of the first rod body (1), and each of the connecting columns is connected to the blocking block.

5. The connector according to claim 2, characterized in that: The connecting block is detachably connected to the second rod body; and / or, The two ends of the connecting column are provided with thread segments with opposite thread directions, and the connecting column is respectively threadedly connected to the first rod body (1) and the blocking block through the thread segments at the two ends.

6. The connecting piece according to any one of claims 1 to 5, characterized in that: An insulating layer is provided on the outer surface of the first rod body (1) and / or the second rod body (2).

7. A battery stack fixing assembly, characterized in that: It comprises two end plates arranged at an interval, the two end plates are connected by a connecting piece (100) as claimed in any one of claims 1 to 6, and a placement space for placing a battery stack unit is formed between the two end plates.

8. A fuel cell stack, characterized in that: It comprises the battery stack fixing assembly as claimed in claim 7, and a battery stack unit arranged between the two end plates.

9. The fuel cell stack according to claim 8, characterized in that: The stack unit comprises a plurality of bipolar plates (7) and membrane electrodes that are alternately stacked, and each of the bipolar plates (7) is provided with a through hole (701) for the connecting member (100) to pass through.

10. The fuel cell stack according to claim 8, characterized in that: A buffer layer is provided between the battery stack unit and at least one of the end plates.

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