Cell

Abstract

The utility model provides a unit battery, the unit battery includes: a first electrode plate and a second electrode plate, the first electrode plate and the second electrode plate are arranged at a relative interval; a membrane electrode assembly is arranged between the first electrode plate and the second electrode plate, the membrane electrode assembly abuts the first electrode plate and the second electrode plate; a limit assembly, one side of the limit assembly is detachably connected to the outer side of the first electrode plate, and the other side of the limit assembly is detachably connected to the outer side of the second electrode plate, and the limit assembly can limit the first electrode plate and the second electrode plate. The technical solution provided by the present application can solve the problem that the sealing assembly and carbon paper in the prior art are prone to overpressure.

Description

Technical Field

[0001] The utility model relates to the technical field of unit batteries, and in particular to a unit battery. Background Art

[0002] The fuel cell is equipped with a unit cell, which is mainly composed of a plate, a membrane electrode, a sealing component and other integrated components. Since the reactants of the fuel cell are all gas, the sealing component can prevent gas leakage, so the role of the sealing component in the fuel cell stack is particularly important.

[0003] The membrane electrode is arranged between two plates, and the sealing assembly is located between the plates and the frame of the membrane electrode. The sealing assembly can prevent the gas and coolant from leaking outward and cross-flowing. The membrane electrode has carbon paper loaded with catalyst. After assembly, the carbon paper and the sealing assembly are compressed at the same time, and jointly bear the pressing force.

[0004] However, since both the sealing component and the carbon paper are viscoelastic materials, as the fuel cell is used, both will experience stress relaxation, that is, the force they can withstand under the designed compression rate will decrease and cannot match the initial pressing force. At this time, further compression will occur. After a certain period of use, the carbon paper will be over-pressurized, causing the fuel cell performance to deteriorate, and the sealing component will be over-pressurized, causing the sealing gasket to undergo large permanent deformation, surface cracks and other defects, thereby reducing the sealing performance and fuel cell performance. Utility Model Content

[0005] The utility model provides a unit battery to solve the problem that the sealing component and carbon paper in the prior art are prone to overpressure.

[0006] The utility model provides a unit battery, which comprises: a first electrode plate and a second electrode plate, which are arranged with a relative interval; a membrane electrode assembly, which is arranged between the first electrode plate and the second electrode plate, and the membrane electrode assembly abuts against the first electrode plate and the second electrode plate; a limiting assembly, one side of the limiting assembly is detachably connected to the outer side of the first electrode plate, and the other side of the limiting assembly is detachably connected to the outer side of the second electrode plate, and the limiting assembly can limit the first electrode plate and the second electrode plate.

[0007] Furthermore, the two sides of the limiting assembly respectively have a first clamping part and a second clamping part, the first clamping part can clamp the first electrode plate, the first clamping part is detachably connected to the first electrode plate, and the second clamping part can clamp the second electrode plate, and the second clamping part is detachably connected to the second electrode plate.

[0008] Furthermore, the limiting assembly also includes a thickness adjustment structure to adjust the distance between the first clamping portion and the second clamping portion, and the thickness adjustment structure adjusts the distance between the first electrode plate and the second electrode plate through the first clamping portion and the second clamping portion.

[0009] Furthermore, the limiting assembly includes: a first clamping plate, the first clamping plate abuts against the first electrode plate, and the first clamping plate is detachably connected to the outer side of the first electrode plate; a second clamping plate abuts against the second electrode plate, and the second clamping plate is detachably connected to the outer side of the second electrode plate; a connecting member, arranged between the first clamping plate and the second clamping plate, and a first extension plate and a second extension plate are arranged on the connecting member, the first extension plate extends between the first electrode plate and the membrane electrode assembly, the second extension plate extends between the second electrode plate and the membrane electrode assembly, the first clamping plate and the first extension plate cooperate to form a first clamping portion, and the second clamping plate and the second extension plate cooperate to form a second clamping portion.

[0010] Furthermore, a first limiting structure is provided between the first clamping plate and the first electrode plate to limit the relative position between the first clamping plate and the first electrode plate; a second limiting structure is provided between the second clamping plate and the second electrode plate to limit the relative position between the second clamping plate and the second electrode plate.

[0011] Furthermore, a first groove is provided on the first clamping plate, a first protrusion is provided on the first pole plate, the first protrusion is provided in the first groove, and the first groove and the first protrusion cooperate to form a first limiting structure; a second groove is provided on the second clamping plate, a second protrusion is provided on the second pole plate, the second protrusion is provided in the second groove, and the second groove and the second protrusion cooperate to form a second limiting structure.

[0012] Furthermore, a first connecting groove and a second connecting groove are provided on the connecting member, a first connecting protrusion is provided on the first clamping plate, and a second connecting protrusion is provided on the second clamping plate. The first connecting protrusion is provided corresponding to the first connecting groove, and the first connecting protrusion is provided in the first connecting groove so that its height can be adjusted. The second connecting protrusion is provided corresponding to the second connecting groove, and the second connecting protrusion is provided in the second connecting groove so that its height can be adjusted. The first connecting protrusion, the first connecting groove, the second connecting protrusion and the second connecting groove cooperate to form a thickness adjustment structure.

[0013] Furthermore, the first connecting protrusion is interference fit with the first connecting groove, and the second connecting protrusion is interference fit with the second connecting groove.

[0014] Furthermore, the diameter of the first connecting protrusion gradually decreases in the direction approaching the connecting member, and the diameter of the first connecting groove gradually increases in the direction approaching the first clamping plate, and the structure of the first connecting protrusion is adapted to the first connecting groove; the diameter of the second connecting protrusion gradually decreases in the direction approaching the connecting member, and the diameter of the second connecting groove gradually increases in the direction approaching the second clamping plate, and the second connecting protrusion is adapted to the structure of the second connecting groove.

[0015] Furthermore, the unit battery includes a plurality of limiting components, and the plurality of limiting components are symmetrically distributed along the center of the first electrode plate and the second electrode plate.

[0016] By applying the technical solution of the utility model, the membrane electrode assembly is arranged between the first electrode plate and the second electrode plate, carbon paper is arranged on the membrane electrode structure, and a sealing gasket is provided between the first electrode plate and the membrane electrode structure and between the second electrode plate and the membrane electrode structure. One side of the limiting assembly is detachably connected to the outer side of the first electrode plate, and the other side of the limiting assembly is detachably connected to the outer side of the second electrode plate. With such arrangement, the limiting assembly can limit the first electrode plate and the second electrode plate, so that the limiting assembly can limit the interval between the first electrode plate and the second electrode plate, and avoid the phenomenon of overpressure on the carbon paper and the sealing gasket. The above structure can avoid deformation of the carbon paper and affect the performance of the fuel cell, and can also avoid permanent deformation of the sealing gasket, and can also avoid defects such as cracks on the surface of the sealing gasket. Thereby, the sealing performance of the sealing gasket and the performance of the fuel cell are guaranteed, and the fuel cell can be guaranteed to work normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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:

[0018] Figure 1 The schematic diagram of the structure of the unit battery provided by the utility model is shown;

[0019] Figure 2 The schematic diagram of the structure of the first clamping plate provided by the utility model is shown.

[0020] The above drawings include the following reference numerals:

[0021] 10. The first plate;

[0022] 20. Second electrode plate;

[0023] 30. Membrane electrode assembly;

[0024] 31. membrane electrode structure; 32. frame;

[0025] 40. Limiting assembly;

[0026] 41. first clamping plate; 411. first groove; 412. first connecting protrusion;

[0027] 42. Second clamping plate;

[0028] 43. Connectors;

[0029] 50. Sealing gasket. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in 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. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] like Figure 1 As shown, an embodiment of the present application provides a unit cell, the unit cell includes a first electrode plate 10, a second electrode plate 20, a membrane electrode assembly 30 and a limiting assembly 40. The first electrode plate 10 and the second electrode plate 20 are arranged at a relative interval. The membrane electrode assembly 30 is arranged between the first electrode plate 10 and the second electrode plate 20, and the membrane electrode assembly 30 abuts against the first electrode plate 10 and the second electrode plate 20. One side of the limiting assembly 40 is detachably connected to the outer side of the first electrode plate 10, and the other side of the limiting assembly 40 is detachably connected to the outer side of the second electrode plate 20, and the limiting assembly 40 can limit the first electrode plate 10 and the second electrode plate 20. Among them, the membrane electrode assembly 30 includes a membrane electrode structure 31 and a frame 32, and the frame 32 is arranged around the periphery of the membrane electrode structure 31. The unit cell also includes two sealing gaskets 50, one of which is arranged between the first electrode plate 10 and the frame 32, and the other is arranged between the second electrode plate 20 and the frame 32.

[0032] By applying the technical solution of the present application, the membrane electrode assembly 30 is arranged between the first electrode plate 10 and the second electrode plate 20, the carbon paper is arranged on the membrane electrode structure 31, and the sealing gasket 50 is arranged between the first electrode plate 10 and the membrane electrode structure 31 and between the second electrode plate 20 and the membrane electrode structure 31. One side of the limiting assembly 40 is detachably connected to the outer side of the first electrode plate 10, and the other side of the limiting assembly 40 is detachably connected to the outer side of the second electrode plate 20. In this way, the limiting assembly 40 can limit the first electrode plate 10 and the second electrode plate 20, so that the limiting assembly 40 can limit the interval between the first electrode plate 10 and the second electrode plate 20, and avoid the phenomenon of overpressure of the carbon paper and the sealing gasket 50. The above structure can avoid deformation of the carbon paper and affect the performance of the fuel cell, and can also avoid permanent deformation of the sealing gasket 50, and can also avoid defects such as cracks on the surface of the sealing gasket 50. Thereby ensuring the sealing performance of the sealing gasket 50 and the performance of the fuel cell, and ensuring that the fuel cell can work normally.

[0033] Among them, the two sides of the limiting assembly 40 are respectively provided with a first clamping part and a second clamping part. The first clamping part can clamp the first pole plate 10, and the first clamping part is detachably connected to the first pole plate 10. The second clamping part can clamp the second pole plate 20, and the second clamping part is detachably connected to the second pole plate 20. Such a configuration is convenient for fixing the first pole plate 10 and the second pole plate 20, and at the same time can ensure the effect of limiting the first pole plate 10 and the second pole plate 20, avoid excessive squeezing of the first pole plate 10 and the second pole plate 20 on the carbon paper and the sealing gasket 50, and ensure the normal operation of the carbon paper and the sealing gasket 50.

[0034] Specifically, the limit assembly 40 also includes a thickness adjustment structure to adjust the distance between the first clamping portion and the second clamping portion, and the thickness adjustment structure adjusts the distance between the first electrode plate 10 and the second electrode plate 20 through the first clamping portion and the second clamping portion. In this way, the distance between the first electrode plate 10 and the second electrode plate 20 can be adjusted by the thickness adjustment structure, so that the pressure on the sealing gasket 50 and the membrane electrode assembly 30 can be adjusted to avoid overpressure on the sealing gasket 50 and the membrane electrode assembly 30, and at the same time, it can also avoid that the pressure on the sealing gasket 50 and the membrane electrode assembly 30 is too small to affect the sealing effect and the catalytic effect. The staff can adjust the thickness adjustment structure according to the needs. In addition, in this way, the limit assembly 40 can be installed on different models of first electrode plates 10 and second electrode plates 20, so as to improve the versatility of the limit assembly 40 and reduce the processing cost of the unit battery.

[0035] Further, the limiting assembly 40 includes a first clamping plate 41, a second clamping plate 42 and a connecting member 43. The first clamping plate 41 abuts against the first electrode plate 10, and the first clamping plate 41 is detachably connected to the outer side of the first electrode plate 10. The second clamping plate 42 abuts against the second electrode plate 20, and the second clamping plate 42 is detachably connected to the outer side of the second electrode plate 20. The connecting member 43 is arranged between the first clamping plate 41 and the second clamping plate 42, and a first extension plate and a second extension plate are arranged on the connecting member 43, the first extension plate extends between the first electrode plate 10 and the membrane electrode assembly 30, and the second extension plate extends between the second electrode plate 20 and the membrane electrode assembly 30, the first clamping plate 41 cooperates with the first extension plate to form a first clamping portion, and the second clamping plate 42 cooperates with the second extension plate to form a second clamping portion. With such arrangement, during installation, the second clamping plate 42 can be connected to the second electrode plate 20 first, and then the connecting member 43 can be placed on the second clamping plate 42 so that the second extension plate abuts against the second electrode plate 20. The membrane electrode assembly 30 is arranged between the first extension plate and the second extension plate, and then the first electrode plate 10 is placed on the membrane electrode assembly 30 so that the first electrode plate 10 abuts against the first extension plate. With such arrangement, it is convenient to assemble the stopper assembly 40 with the first electrode plate 10, the second electrode plate 20 and the membrane electrode assembly 30, and the structure is simple and the operation is convenient.

[0036] Among them, there is a first limiting structure between the first clamping plate 41 and the first electrode plate 10 to limit the relative position between the first clamping plate 41 and the first electrode plate 10. There is a second limiting structure between the second clamping plate 42 and the second electrode plate 20 to limit the relative position between the second clamping plate 42 and the second electrode plate 20. In this way, the first limiting structure can limit the position of the first electrode plate 10 relative to the first clamping plate 41 along the length direction and along the width direction, and the second limiting structure can limit the position of the second electrode plate 20 relative to the second clamping plate 42 along the length direction and along the width direction. In this way, the stability of the connection between the first clamping plate 41 and the first electrode plate 10 and the connection between the second clamping plate 42 and the second electrode plate 20 can be ensured, and the misalignment of the first clamping plate 41 and the second clamping plate 42 can be avoided, so as to ensure the limiting effect of the limiting assembly 40 on the first electrode plate 10 and the second electrode plate 20.

[0037] Specifically, a first groove 411 is provided on the first clamping plate 41, and a first protrusion is provided on the first pole plate 10, the first protrusion is provided in the first groove 411, and the first groove 411 cooperates with the first protrusion to form a first limiting structure. Such a configuration facilitates the processing of the first pole plate 10 and the first clamping plate 41, and the structure is simple and easy to operate. Among them, in the present application, the first protrusion is adapted to the structure of the first groove 411. Optionally, the first groove 411 can be a square structure, a circular structure, or a combination of a square structure and a circular structure. Optionally, the first groove 411 can be set to run through one side of the first clamping plate 41, and the first groove 411 can also be spaced apart from the side of the first clamping plate 41.

[0038] A second groove is provided on the second clamping plate 42, and a second protrusion is provided on the second pole plate 20. The second protrusion is provided in the second groove, and the second groove and the second protrusion cooperate to form a second limiting structure. Such a configuration facilitates the processing of the second pole plate 20 and the second clamping plate 42, and the structure is simple and the operation is convenient. Among them, in the present application, the structure of the second protrusion is adapted to the structure of the second groove. Optionally, the second groove can be a square structure, a circular structure, or a combination of a square structure and a circular structure. Optionally, the second groove can be set to run through one side of the second clamping plate 42, and the second groove can also be spaced apart from the side of the second clamping plate 42.

[0039] Optionally, the first electrode plate 10 and the second electrode plate 20 may be formed by stamping.

[0040] like Figure 2As shown, the connecting member 43 is provided with a first connecting groove and a second connecting groove, the first clamping plate 41 is provided with a first connecting protrusion 412, and the second clamping plate 42 is provided with a second connecting protrusion. The first connecting protrusion 412 is provided corresponding to the first connecting groove, and the first connecting protrusion 412 is provided in the first connecting groove with adjustable height. The second connecting protrusion is provided corresponding to the second connecting groove, and the second connecting protrusion is provided in the second connecting groove with adjustable height. The first connecting protrusion 412, the first connecting groove, the second connecting protrusion and the second connecting groove cooperate to form a thickness adjustment structure. Such a configuration is convenient for processing the connecting member 43, the first clamping plate 41 and the second clamping plate 42, and at the same time, it is convenient for assembling the limit assembly 40. And the thickness adjustment structure can adjust the distance between the first clamping plate 41 and the second clamping plate 42 while connecting the connecting member 43 with the first clamping plate 41 and the second clamping plate 42, and then can adjust the distance between the first electrode plate 10 and the second electrode plate 20, thereby improving the versatility of the limit assembly 40. Such an arrangement can simplify the structure of the limit assembly 40 and facilitate the processing of the limit assembly 40 .

[0041] The connector 43 may be made of materials such as PPS resin and rubber, and the strength of the connector 43 is higher than that of the sealing gasket 50 and the membrane electrode structure 31 .

[0042] Furthermore, the first connection protrusion 412 is interference fit with the first connection groove, and the second connection protrusion is interference fit with the second connection groove. This arrangement facilitates the connection of the first clamping plate 41 and the second clamping plate 42 with the connecting member 43, and the operation is simple.

[0043] Specifically, the diameter of the first connecting protrusion 412 gradually decreases along the direction close to the connecting member 43, the diameter of the first connecting groove gradually increases along the direction close to the first clamping plate 41, and the structure of the first connecting protrusion 412 is adapted to the structure of the first connecting groove. That is, the first connecting protrusion 412 and the first connecting groove are conical structures, which is arranged so that the first connecting protrusion 412 and the first connecting groove are connected, the difficulty of connecting the first connecting protrusion 412 and the first connecting groove is reduced, and it is convenient for the staff to assemble. The diameter of the second connecting protrusion gradually decreases along the direction close to the connecting member 43, the diameter of the second connecting groove gradually increases along the direction close to the second clamping plate 42, and the structure of the second connecting protrusion is adapted to the structure of the second connecting groove. That is, the second connecting protrusion and the second connecting groove are conical structures, which is arranged so that the second connecting protrusion and the second connecting groove are connected, the difficulty of connecting the second connecting protrusion and the second connecting groove is reduced, and it is convenient for the staff to assemble.

[0044] Furthermore, the unit cell includes a plurality of stopper assemblies 40, and the plurality of stopper assemblies 40 are symmetrically distributed along the center of the first electrode plate 10 and the second electrode plate 20. Such an arrangement can ensure the uniformity of the distance between the first electrode plate 10 and the second electrode plate 20, prevent the first electrode plate 10 from tilting to one side, and further ensure the uniformity of the force on the membrane electrode structure 31 and the sealing gasket 50, thereby ensuring the performance of the fuel cell.

[0045] Therefore, by applying the above scheme, the membrane electrode assembly 30 is arranged between the first electrode plate 10 and the second electrode plate 20, the carbon paper is arranged on the membrane electrode structure 31, and the sealing gasket 50 is arranged between the first electrode plate 10 and the membrane electrode structure 31 and between the second electrode plate 20 and the membrane electrode structure 31. One side of the limiting assembly 40 is detachably connected to the outer side of the first electrode plate 10, and the other side of the limiting assembly 40 is detachably connected to the outer side of the second electrode plate 20. In this way, the limiting assembly 40 can limit the first electrode plate 10 and the second electrode plate 20, so that the limiting assembly 40 can limit the interval between the first electrode plate 10 and the second electrode plate 20, and avoid the phenomenon of overpressure of the carbon paper and the sealing gasket 50. By adopting the above structure, the deformation of the carbon paper can be avoided to affect the performance of the fuel cell, and the permanent deformation of the sealing gasket 50 can be avoided, and the defects such as cracks on the surface of the sealing gasket 50 can be avoided. Thereby, the sealing performance of the sealing gasket 50 and the performance of the fuel cell are guaranteed, and the fuel cell can be guaranteed to work normally.

[0046] Furthermore, the first limiting structure can limit the position of the first electrode plate 10 relative to the first clamping plate 41 along the length direction and along the width direction, and the second limiting structure can limit the position of the second electrode plate 20 relative to the second clamping plate 42 along the length direction and along the width direction. In this way, the stability of the connection between the first clamping plate 41 and the first electrode plate 10 and the connection between the second clamping plate 42 and the second electrode plate 20 can be ensured, and the misalignment of the first clamping plate 41 and the second clamping plate 42 can be avoided, thereby ensuring the limiting effect of the limiting assembly 40 on the first electrode plate 10 and the second electrode plate 20.

[0047] At the same time, the thickness adjustment structure can adjust the distance between the first clamping plate 41 and the second clamping plate 42 while connecting the connecting member 43 with the first clamping plate 41 and the second clamping plate 42, and further adjust the distance between the first electrode plate 10 and the second electrode plate 20. Such a configuration can simplify the structure of the limit assembly 40 and facilitate the processing of the limit assembly 40.

[0048] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0049] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0050] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0051] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0052] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0053] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A unit cell, characterized in that: The unit cell comprises: A first electrode plate (10) and a second electrode plate (20), wherein the first electrode plate (10) and the second electrode plate (20) are arranged relatively spaced apart; A membrane electrode assembly (30) is disposed between the first electrode plate (10) and the second electrode plate (20), and the membrane electrode assembly (30) abuts against the first electrode plate (10) and the second electrode plate (20); A limiting assembly (40), one side of the limiting assembly (40) being detachably connected to the outer side of the first pole plate (10), and the other side of the limiting assembly (40) being detachably connected to the outer side of the second pole plate (20), the limiting assembly (40) being capable of limiting the first pole plate (10) and the second pole plate (20).

2. The unit cell according to claim 1, characterized in that: The limiting assembly (40) has a first clamping portion and a second clamping portion on both sides, respectively; the first clamping portion is capable of clamping the first electrode plate (10), and the first clamping portion is detachably connected to the first electrode plate (10); the second clamping portion is capable of clamping the second electrode plate (20), and the second clamping portion is detachably connected to the second electrode plate (20).

3. The unit cell according to claim 2, characterized in that: The limiting assembly (40) further comprises a thickness adjustment structure for adjusting the distance between the first clamping portion and the second clamping portion, wherein the thickness adjustment structure adjusts the distance between the first electrode plate (10) and the second electrode plate (20) through the first clamping portion and the second clamping portion.

4. The unit cell according to claim 3, characterized in that: The limiting component (40) comprises: A first clamping plate (41), the first clamping plate (41) abutting against the first electrode plate (10), and the first clamping plate (41) is detachably connected to the outer side of the first electrode plate (10); A second clamping plate (42), the second clamping plate (42) abutting against the second electrode plate (20), and the second clamping plate (42) is detachably connected to the outer side of the second electrode plate (20); A connecting member (43) is arranged between the first clamping plate (41) and the second clamping plate (42), and a first extension plate and a second extension plate are arranged on the connecting member (43), the first extension plate extends between the first electrode plate (10) and the membrane electrode assembly (30), and the second extension plate extends between the second electrode plate (20) and the membrane electrode assembly (30), the first clamping plate (41) cooperates with the first extension plate to form the first clamping portion, and the second clamping plate (42) cooperates with the second extension plate to form the second clamping portion.

5. The unit cell according to claim 4, characterized in that: A first limiting structure is provided between the first clamping plate (41) and the first pole plate (10) to limit the relative position between the first clamping plate (41) and the first pole plate (10); and a second limiting structure is provided between the second clamping plate (42) and the second pole plate (20) to limit the relative position between the second clamping plate (42) and the second pole plate (20).

6. The unit cell according to claim 5, characterized in that: The first clamping plate (41) is provided with a first groove (411), the first electrode plate (10) is provided with a first protrusion, the first protrusion is arranged in the first groove (411), and the first groove (411) cooperates with the first protrusion to form the first limiting structure; The second clamping plate (42) is provided with a second groove, the second pole plate (20) is provided with a second protrusion, the second protrusion is arranged in the second groove, and the second groove cooperates with the second protrusion to form the second limiting structure.

7. The unit cell according to claim 4, characterized in that: The connecting member (43) is provided with a first connecting groove and a second connecting groove, the first clamping plate (41) is provided with a first connecting protrusion (412), and the second clamping plate (42) is provided with a second connecting protrusion, the first connecting protrusion (412) is provided corresponding to the first connecting groove, the first connecting protrusion (412) is arranged in the first connecting groove in a height-adjustable manner, the second connecting protrusion is arranged corresponding to the second connecting groove, the second connecting protrusion is arranged in the second connecting groove in a height-adjustable manner, and the first connecting protrusion (412), the first connecting groove, the second connecting protrusion and the second connecting groove cooperate to form the thickness adjustment structure.

8. The unit cell according to claim 7, characterized in that: The first connecting protrusion (412) is interference fit with the first connecting groove, and the second connecting protrusion is interference fit with the second connecting groove.

9. The unit cell according to claim 7, characterized in that: The diameter of the first connecting protrusion (412) gradually decreases in the direction approaching the connecting member (43), and the diameter of the first connecting groove gradually increases in the direction approaching the first clamping plate (41), and the structure of the first connecting protrusion (412) is adapted to the structure of the first connecting groove; the diameter of the second connecting protrusion gradually decreases in the direction approaching the connecting member (43), and the diameter of the second connecting groove gradually increases in the direction approaching the second clamping plate (42), and the structure of the second connecting protrusion is adapted to the structure of the second connecting groove.

10. The unit cell according to claim 1, characterized in that: The unit battery comprises a plurality of the limiting components (40), and the plurality of the limiting components (40) are symmetrically distributed along the center of the first electrode plate (10) and the second electrode plate (20).

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