Cell structure and fuel cell system
By eliminating the membrane electrode frame in the fuel cell and using seals and insulators to seal and support the active area, the problems of contact resistance and calculation errors caused by the overlap of the membrane electrode frame are solved, achieving more efficient electrochemical reaction and insulation effect.
Patent Information
- Application Number
- CN202520028436.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-02
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2035-01-02
AI Technical Summary
In existing fuel cells, the overlap between the membrane electrode frame and the membrane electrode assembly leads to increased contact resistance, affecting the accuracy of gas diffusion layer compressibility calculation and potentially causing bipolar plate short circuits.
By using sealing and insulating components arranged around the active region of the proton exchange membrane, the sealing frame in the traditional membrane electrode structure is eliminated. The active region is sealed and supported by the sealing and insulating components. The insulating components are sandwiched between the bipolar plates, and the positioning part ensures the precise positioning of the proton exchange membrane.
It reduces the contact resistance between the membrane electrode and the bipolar plate, improves the accuracy of the gas diffusion layer compressibility calculation, ensures insulation, prevents short circuits, and enhances the smoothness of the electrochemical reaction and battery performance.
Smart Images
Figure CN223884413U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to electrochemical cell technical field, especially single cell structure, the utility model discloses further relates to a fuel cell system with the single cell structure. BACKGROUND
[0002] The membrane electrode frame (MEA Frame) in the fuel cell is an important component of the fuel cell stack, and its design and performance have a direct impact on the efficiency, cost and service life of the fuel cell. The main function of the membrane electrode frame is to support and fix the membrane electrode assembly, and to provide distribution and discharge channels for fuel and oxidant (usually hydrogen and air), as well as heat and water management. The membrane electrode frame is usually made of PTFE (Polytetrafluoroethylene) material to form an insulating frame, which realizes the insulation between the bipolar plates and also plays a sealing role.
[0003] In the actual research and development test of the fuel cell, since the membrane electrode frame forms a lap area with the active material in the membrane electrode after being set, it will cause the contact resistance between the membrane electrode and the bipolar plate to increase, and the lap between the frame boundary and the gas diffusion layer boundary area will also affect the accuracy of the calculation result when calculating the compression rate of the gas diffusion layer. SUMMARY
[0004] Therefore, the utility model aims at providing a single cell structure which can cancel the sealing frame in the traditional membrane electrode structure.
[0005] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:
[0006] A single cell structure, comprising oppositely arranged bipolar plates and a membrane electrode assembly located between the two bipolar plates;
[0007] The membrane electrode assembly has a proton exchange membrane and an active area on the proton exchange membrane, and the single cell structure has a sealing member surrounding the outside of the active area and an insulating member located outside the sealing member;
[0008] The sealing member is used to form a seal for the active area, and the insulating member is clamped between the two bipolar plates.
[0009] Further, the active area has catalyst layers separately arranged on both sides of the proton exchange membrane, and gas diffusion layers arranged on the catalyst layers on each side; the outer edges of each side of the gas diffusion layer and the catalyst layer are flush.
[0010] Further, the proton exchange membrane has an inner part in the active area and an outer part outside the active area; the seal and the insulation are both two parts arranged on both sides of the outer part.
[0011] Further, at least one of the seals comprises a sealant line arranged around the active area.
[0012] Further, each of the seals is connected with the proton exchange membrane and the gas diffusion layer on the same side.
[0013] Further, at least one of the insulations comprises an insulation plate connected to the bipolar plate on the same side.
[0014] Further, at least one of the insulations comprises an insulation coating arranged on the bipolar plate on the same side.
[0015] Further, a positioning part is arranged between the outer part and at least one of the bipolar plates; the positioning part is used for positioning the proton exchange membrane between the bipolar plates.
[0016] Further, the positioning part comprises a positioning hole arranged on the outer part and a positioning protrusion arranged on at least one of the bipolar plates, the positioning protrusion is inserted into the positioning hole.
[0017] Compared with the prior art, the utility model has the following advantages:
[0018] The single cell structure has the following advantages: the seal arranged around the active area outside the proton exchange membrane seals the active area, and the insulation arranged outside the seal supports and fixes the membrane electrode assembly, so that the frame structure in the traditional membrane electrode structure can be cancelled, the overlap between the edge of the frame structure and the active area in the traditional structure can be avoided, the contact resistance between the membrane electrode and the bipolar plate can be reduced, the accuracy of the gas diffusion layer compression rate calculation result can be improved, the insulation between the bipolar plates can be better guaranteed by the insulation arranged outside the seal, the short circuit between the bipolar plates can be prevented, and the membrane electrode assembly can be protected to a certain extent.
[0019] In addition, the gas diffusion layer is arranged flush with the outer edge of the catalyst layer, which facilitates efficient transport of the reactants and reaction, and makes the electrochemical reaction more smoothly. The proton exchange membrane has an outer portion outside the active area, which on the one hand, by virtue of the insulating properties of the outer portion, can avoid gas leakage caused by the boundary of the active area, reduce the internal loss of the membrane electrode, and also facilitate the sealing and insulation effect of the active area, and on the other hand, can facilitate the accuracy of the position of the proton exchange membrane in the single cell structure. Furthermore, the sealing member and the insulating member are arranged in the outer portion, which can better seal the active area on both sides of the proton exchange membrane, and also better ensure the insulation between the two bipolar plates.
[0020] Secondly, by making each side sealing member and each side insulating member directly contact the outer portion and the corresponding side bipolar plate, the sealing member and the insulating member completely replace the membrane electrode frame structure in the traditional structure, thereby achieving the purpose of canceling the membrane electrode frame structure. The sealing member on both sides adopts a sealing glue line arranged around the active area, which has a simple structure and can form a reliable sealing barrier for the active area by virtue of good sealing performance. The sealing member on each side is connected with the proton exchange membrane and the gas diffusion layer on the same side, which can further improve the sealing effect of the active area and effectively prevent gas leakage and other factors that may affect the performance of the battery.
[0021] Furthermore, the insulating member on both sides adopts an insulating plate connected to the bipolar plate on the same side, which has a simple structure and is easy to form and prepare, and the insulating plate can provide stable and reliable insulation performance. The insulating member on both sides adopts an insulating coating arranged on the bipolar plate on the same side, which also has the characteristics of simple structure and easy preparation, and can also provide stable and reliable insulation performance.
[0022] In addition, the positioning portion is arranged between the outer portion of the proton exchange membrane and the two bipolar plates, which facilitates the positioning of the proton exchange membrane between the two bipolar plates, ensures the accurate position of the proton exchange membrane in the single cell structure, thereby improving the accuracy and efficiency of the assembly of the single cell structure, and also facilitates the improvement of the performance of the single cell. The positioning portion adopts a positioning hole and a positioning protrusion, and the positioning protrusion is inserted into the positioning hole, which has a simple structure and is easy to process and prepare, and can achieve accurate positioning of the proton exchange membrane.
[0023] Another purpose of the present application is to provide a fuel cell system, wherein the single cell structure as described above is arranged in the fuel cell system.
[0024] The fuel cell system of the utility model, through above-mentioned single cell structure, can cancel the frame structure on traditional membrane electrode, is favorable for reducing the contact resistance between membrane electrode and bipolar plate, improves the accuracy of gas diffusion layer compression rate calculation result, can also guarantee the insulation between two bipolar plates, thereby is favorable for improving the performance of fuel cell system. BRIEF DESCRIPTION OF DRAWINGS
[0025] The drawings constituting a part of the utility model provide further understanding of the utility model, the illustrative embodiment of the utility model and its explanation are used to explain the utility model, and do not constitute improper limitation to the utility model.In the drawings:
[0026] Figure 1 The single cell structure of the utility model embodiment is described for the sectional view;
[0027] Figure 2 The membrane electrode assembly of the utility model embodiment is described for the plan view;
[0028] Mark explanation:
[0029] 1, proton exchange membrane;2, bipolar plate;3, sealing element;4, insulating element;10, positioning hole;11, catalyst layer;12, gas diffusion layer;101, anode catalyst layer;102, cathode catalyst layer;103, anode gas diffusion layer;104, cathode gas diffusion layer. DETAILED DESCRIPTION
[0030] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.
[0031] In the description of the utility model, it should be noted that if the terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or position relationship appear, they are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation to the utility model.In addition, if the terms such as "first", "second" appear, they are also used for the purpose of description, and cannot be understood as indicating or implying relative importance.
[0032] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model in light of the specific circumstances.
[0033] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0034] Example 1
[0035] This embodiment relates to a single-cell structure that eliminates the sealing frame in traditional membrane electrode structures, and while ensuring sealing and insulation, it also helps to reduce the contact resistance between the membrane electrode and the bipolar plate.
[0036] In terms of overall structure, such as Figure 1 As shown, the single-cell structure of this embodiment includes bipolar plates 2 arranged opposite each other, and a membrane electrode assembly located between the two bipolar plates 2. The membrane electrode assembly has a proton exchange membrane 1 and an active region located on the proton exchange membrane 1. The single-cell structure has a seal 3 surrounding the active region and an insulator 4 located outside the seal 3. The seal 3 forms a seal to the active region, and the insulator 4 is sandwiched between the two bipolar plates 2.
[0037] In this structure, the active region is sealed by a sealing element 3 surrounding the active region on the proton exchange membrane 1. This, combined with an insulating element 4 located outside the sealing element 3, supports and fixes the membrane electrode assembly. This not only eliminates the need for a frame structure in traditional membrane electrode structures but also avoids the overlap between the edge of the frame structure and the active region, thus reducing the contact resistance between the membrane electrode and the bipolar plates and improving the accuracy of the gas diffusion layer 12 compressibility calculation. Simultaneously, the insulating element located outside the sealing element better ensures insulation between the two bipolar plates 2, preventing short circuits and providing some protection for the membrane electrode assembly.
[0038] It should be noted that in the single-cell structure of this embodiment, a structure based on the sealing member 3 arranged around the active region on the proton exchange membrane 1 and the insulating member 4 disposed outside the sealing member 3, and then providing membrane electrode frames on both sides of the proton exchange membrane 1, is also possible. That is to say, in the single-cell structure of this embodiment, membrane electrode frames can be provided or omitted, wherein omitting the membrane electrode frames is the preferred embodiment.
[0039] Based on the above overall introduction, in detail, still referring to Figure 1 The single cell structure of the embodiment shown includes two oppositely arranged bipolar plates 2, a membrane electrode assembly, a sealing member 3 and an insulation member 4. Among them, the two oppositely arranged bipolar plates 2 are also the anode plate and the cathode plate arranged oppositely, and the membrane electrode assembly is located between the anode plate and the cathode plate.
[0040] In terms of specific structure, as a preferred embodiment, the membrane electrode assembly has a proton exchange membrane 1, the active area has catalyst layers 11 arranged on both sides of the proton exchange membrane 1, and gas diffusion layers 12 arranged on each side of the catalyst layer 11. The outer edges of each side of the gas diffusion layer 12 and the catalyst layer 11 are flush.
[0041] Continuing to refer to Figure 1 The catalyst layer 11 includes an anode catalyst layer 101 and a cathode catalyst layer 102, and the gas diffusion layer 12 includes an anode gas diffusion layer 103 and a cathode gas diffusion layer 104. The anode gas diffusion layer 103 is located on the side of the proton exchange membrane 1 with the anode catalyst layer 101, and the cathode gas diffusion layer 104 is located on the side of the proton exchange membrane 1 with the cathode catalyst layer 102. Moreover, the outer edge of the anode gas diffusion layer 103 is flush with the outer edge of the anode catalyst layer 101, and the outer edge of the cathode gas diffusion layer 104 is flush with the outer edge of the cathode catalyst layer 102. At this time, this arrangement is conducive to the efficient transmission and reaction of reactants between layers, making the electrochemical reaction more smoothly.
[0042] On the basis that the sealing member 3 surrounds the outside of the active area and forms a seal to the active area, and the outer edges of each side of the gas diffusion layer 12 are flush with the outer edges of the catalyst layer 11, in the embodiment, the proton exchange membrane 1 has Figure 1 In combination with Figure 2 The proton exchange membrane 1 has an inner side portion located in the active area and an outer side portion located outside the active area. Moreover, as a preferred, the outer side portion is provided with a sealing member 3 and an insulation member 4 on both sides.
[0043] Among them, the outer side portion can be connected with the two side insulation members 4 by overlapping, so that the insulation performance of the outer side portion and the cooperation with the two side insulation members 4 can avoid gas leakage caused by the boundary of the active area, reduce the internal loss of the membrane electrode, and improve the sealing and insulation effect of the active area, and also help to ensure the accuracy of the position of the proton exchange membrane 1 in the single cell structure.
[0044] Meanwhile, the seal 3 and the insulation 4 are arranged on both sides of the outer portion, so that the seal 3 on both sides can seal the active area on both sides of the proton exchange membrane, and the insulation 4 on both sides can ensure the insulation between the anode plate and the cathode plate, and can also protect the membrane electrode assembly to some extent. The combination of the seal 3 and the insulation 4 can take into account the sealing and insulation, and can also support and fix the membrane electrode assembly, and can also reduce the contact impedance of the membrane electrode, which is conducive to improving the performance of the single cell.
[0045] It is worth mentioning here that in the cross section of the membrane electrode assembly, the outer edge of the outer portion of the proton exchange membrane 1 can be located between the outer edge and the inner edge of the insulation 4, or the outer edge of the outer portion of the proton exchange membrane 1 can be flush with the outer edge of the insulation 4. In this embodiment, as a preferred, the outer edge of the outer portion of the proton exchange membrane 1 is flush with the outer edge of the insulation 4, which can better ensure the sealing and insulation effect of the membrane electrode.
[0046] In this embodiment, as a preferred, as shown in Figure 1 , each side seal 3 and each side insulation 4 are in direct contact with the outer portion of the proton exchange membrane 1, and each side seal 3 and each side insulation 4 are also in direct contact with the corresponding side bipolar plate 2. In this way, the seal 3 and the insulation 4 can completely replace the frame structure in the traditional membrane electrode structure, thereby achieving the purpose of canceling the frame structure of the membrane electrode, and avoiding the lap joint of the frame structure edge and the active area in the traditional structure, thereby reducing the contact resistance between the membrane electrode and the bipolar plate 2, improving the accuracy of the gas diffusion layer compression rate calculation result, and better ensuring the insulation between the two bipolar plates 2 by using the insulation.
[0047] As a more preferred embodiment, at least one side seal 3 includes a sealant line arranged around the active area. The seal 3 arranged on both sides of the outer portion adopts a sealant line, which has a simple structure and makes the sealant line in direct contact with the outer portion of the proton exchange membrane 1, which is convenient for setting on the proton exchange membrane 1, and can form a reliable sealing barrier for the active area by virtue of the good sealing performance of the sealant line.
[0048] It is worth mentioning that the sealant line can be a sealing strip formed by dispensing, and for the active area being rectangular or circular, it can also use a rectangular sealing ring or an O-shaped sealing ring in the prior art. In specific implementation, for example, when the dispensing method is used, the dispensing is performed along the circumferential outer side of the active area, that is, along the position where the outer circumferential surface of the gas diffusion layer on each side intersects with the surface of the proton exchange membrane to form an annular area, and the annular area is as shown in Figure 2 .
[0049] It is worth noting that in the dispensing process, the width of the sealant line can be controlled according to the actual needs, by controlling the amount and speed of dispensing, to ensure that the formed strip is only around the outside of the gas diffusion layer, avoiding the overlap of the sealant line and the active area, and ensuring that the strip is sealed and connected to the surface of the proton exchange membrane 1 and the outer circumferential surface of each side gas diffusion layer 12.
[0050] When the sealant line adopts a sealing ring structure, the sealing ring can be tightly clamped on the outer circumferential surface of the gas diffusion layer 12, and to ensure the sealing connection of the sealing ring to the surface of the proton exchange membrane 1, the end surface of the sealing ring close to the proton exchange membrane 1 can be sealed and connected to the proton exchange membrane by adhesion, which can also avoid the overlap of the sealant line and the active area.
[0051] Also as a preferred embodiment, each side seal 3 is connected together with the proton exchange membrane 1 and the gas diffusion layer 12 on the same side. Specifically, the seal 3 on the anode side is connected together with the outer side of the proton exchange membrane 1 and the anode gas diffusion layer 103, and the seal 3 on the cathode side is connected together with the outer side of the proton exchange membrane 1 and the cathode gas diffusion layer 104. This arrangement is conducive to the arrangement of the seal 3 and can further improve the sealing effect on the active area, effectively preventing gas leakage and other factors that may affect the performance of the battery.
[0052] In specific implementation, the sealant line on the anode side is sealed and connected together with the proton exchange membrane 1 and the anode diffusion layer 103, and the sealant line on the cathode side is sealed and connected together with the proton exchange membrane 1 and the cathode diffusion layer 104, thereby achieving sealing of the active area on the proton exchange membrane 1.
[0053] It is worth mentioning here that in this embodiment, the seal 3 can be provided on the bipolar plate 2 on both sides, so that the seal 3 can be arranged outside the active area without overlapping the active area, and the sealing performance of the active area can be ensured.
[0054] In this embodiment, the insulating member 4 is preferably provided on the bipolar plate 2. Specifically, as one of the preferred embodiments, at least one side insulating member 4 includes an insulating plate connected to the bipolar plate 2 on the same side. Here, the structure of the insulating plate is simple, easy to form and manufacture, and can provide stable and reliable insulation performance.
[0055] In specific implementation, still referring to Figure 1, the insulation piece 4 on the anode side comprises a first insulation plate adhesively connected to the anode plate, and the insulation piece 4 on the cathode side comprises a second insulation plate adhesively connected to the cathode plate. Both the first insulation plate and the second insulation plate are in a structure of a back-shaped structure. The first insulation plate is located outside the sealing rubber line on the anode side, the second insulation plate is located outside the sealing rubber line on the cathode side, and the inner side edges of the first insulation plate and the second insulation plate preferably abut the sealing rubber line on the same side, respectively.
[0056] At the same time, the insulation piece 4 on the anode side and the insulation piece 4 on the cathode side, i.e. the first insulation plate and the second insulation plate, are in direct contact with the outer part of the proton exchange membrane 1 and the bipolar plate 2 on the corresponding side. At this time, in combination with the fact that each sealing piece 3 is in direct contact with the outer part of the proton exchange membrane 1 and the bipolar plate 2 on the corresponding side, the frame structure in the traditional membrane electrode structure can be completely replaced.
[0057] As another preferred embodiment, at least one side insulation piece 4 comprises an insulation coating arranged on the bipolar plate 2 on the same side. At this time, the insulation pieces on both sides are arranged as insulation coatings on the bipolar plates on the same side, which also has the characteristics of simple structure and easy preparation, and can also provide stable and reliable insulation performance.
[0058] It is worth noting that in the present embodiment, the insulation piece 4 can also be arranged on the membrane electrode in addition to being arranged on the bipolar plate 2, which is also possible. In addition, it is also worth noting that the material of the insulation plate and the insulation coating is an insulation material with high temperature resistance and high stability, such as PEN-polyethylene naphthalate, PI-polyimide, PPS-polyphenylene sulfide or PEEK-polyether ether ketone. It is also worth noting that the insulation piece 4 arranged on the bipolar plate 2 on both sides can also be arranged in the following structure, i.e. an insulation plate is adhesively connected to the bipolar plate 2 on one side, and an insulation coating is arranged on the bipolar plate 2 on the other side, which is also feasible.
[0059] In addition, in some feasible embodiments, in combination with the fact that Figure 1 and Figure 2 As shown, in order to ensure the positional accuracy of the proton exchange membrane 1 in the single cell structure, in the present embodiment, a positioning part is arranged between the outer part of the proton exchange membrane 1 and at least one side of the bipolar plate 2, which is used to position the proton exchange membrane 1 between the bipolar plates 2 on both sides.
[0060] Specifically, as a more preferred embodiment, the positioning part comprises a positioning hole 10 arranged on the outer part of the proton exchange membrane 1, and a positioning protrusion arranged on at least one side of the bipolar plate 2, the positioning protrusion being inserted into the positioning hole 10. In this way, through the insertion cooperation of the positioning protrusion and the positioning hole 10, not only is the structure simple and easy to process and manufacture, but also the precise positioning of the proton exchange membrane can be achieved, thereby ensuring the stable and efficient operation of the single cell.
[0061] In the implementation, the positioning holes 10 are two holes formed on the outer side of the proton exchange membrane and arranged at intervals, and the two positioning holes 10 are arranged diagonally. In addition, corresponding to the two positioning holes 10, positioning protrusions can be arranged on the anode plate, or the positioning protrusions can be arranged on the cathode plate, or the positioning protrusions can be arranged on both the anode plate and the cathode plate. Through the insertion and cooperation of the positioning protrusions and the positioning holes 10, the proton exchange membrane can be well positioned between the anode plate and the cathode plate, that is, between the two bipolar plates 2.
[0062] The single cell structure of the embodiment can seal the active area by arranging the sealing member 3 around the outer side of the active area, and support and fix the membrane electrode assembly by cooperating with the insulating member 4 arranged on the outer side of the sealing member 3. Therefore, the frame structure in the traditional membrane electrode structure can be cancelled, and the lap joint between the edge of the frame structure and the active area can be avoided, which is beneficial to reduce the contact resistance between the membrane electrode and the bipolar plate, improve the accuracy of the calculation result of the gas diffusion layer compression rate, and better ensure the insulation between the two bipolar plates 2 to prevent short circuit between the two bipolar plates 2. In addition, the membrane electrode assembly can also be protected to a certain extent.
[0063] Embodiment two
[0064] The embodiment relates to a fuel cell system provided with the single cell structure of the embodiment one.
[0065] The fuel cell system of the embodiment can cancel the frame structure on the traditional membrane electrode, avoid the lap joint between the edge of the frame structure and the active area in the traditional structure, reduce the contact resistance between the membrane electrode and the bipolar plate, improve the accuracy of the calculation result of the gas diffusion layer compression rate, and ensure the insulation between the two bipolar plates 2, so as to improve the performance of the fuel cell system.
[0066] The above is only a preferred embodiment of the utility model, and is not used to limit the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.
Claims
1. A single cell structure, characterized in that: comprising oppositely arranged bipolar plates (2), and a membrane electrode assembly located between the bipolar plates (2) on both sides; the membrane electrode assembly has a proton exchange membrane (1), and an active area located on the proton exchange membrane (1), and the single cell structure has a seal (3) surrounding the outside of the active area, and an insulating member (4) located outside the seal (3); the seal (3) is used to form a seal to the active area, and the insulating member (4) is clamped between the bipolar plates (2) on both sides.
2. The single cell structure according to claim 1, characterized in that: the active area has a catalyst layer (11) arranged on both sides of the proton exchange membrane (1), and a gas diffusion layer (12) arranged on each side of the catalyst layer (11); the outer edges of each side of the gas diffusion layer (12) and the catalyst layer (11) are arranged flush.
3. The single cell structure according to claim 2, characterized in that: the proton exchange membrane (1) has an inside portion located in the active area, and an outside portion located outside the active area; the seal (3) and the insulating member (4) are both two arranged on both sides of the outside portion.
4. The single cell structure according to claim 3, characterized in that: each side of the seal (3) and each side of the insulating member (4) are in direct contact with the outside portion and the corresponding side of the bipolar plate (2).
5. The single cell structure according to claim 3, characterized in that: at least one side of the seal (3) comprises a sealant line arranged around the active area.
6. The single cell structure according to claim 3, characterized in that: each side of the seal (3) is connected together with the proton exchange membrane (1) and the gas diffusion layer (12) on the same side.
7. The single cell structure according to claim 3, characterized in that: at least one side of the insulating member (4) comprises an insulating plate connected to the bipolar plate (2) on the same side; and / or, at least one side of the insulating member (4) comprises an insulating coating arranged on the bipolar plate (2) on the same side.
8. The single cell structure according to any one of claims 3 to 7, characterized in that: a positioning portion is arranged between the outside portion and at least one side of the bipolar plate (2); the positioning portion is used to position the proton exchange membrane (1) between the bipolar plates (2) on both sides.
9. The single cell structure according to claim 8, characterized in that: the positioning portion comprises a positioning hole (10) arranged on the outside portion, and a positioning protrusion arranged on at least one side of the bipolar plate (2), the positioning protrusion is inserted into the positioning hole (10).
10. A fuel cell system, characterized in that: the fuel cell system is provided with the single cell structure according to any one of claims 1 to 9.