Polar plate, single cell and electric pile

Abstract

The utility model provides a pole plate, a monocell and a galvanic pile, the pole plate is provided with an edge part arranged along the circumferential direction of the pole plate, the edge part is provided with a positioning hole, the positioning hole is used for positioning the pole plate when a pile core of the galvanic pile is stacked, the edge part is provided with a protruding part protruding towards the positioning hole, and the protruding part is used for positioning the pole plate when the pile core of the galvanic pile is stacked. The thickness of the protruding part is smaller than that of the edge part. According to the polar plate disclosed by the utility model, the positioning of the polar plate is facilitated by arranging the positioning hole on the edge part, so that the assembling efficiency of the polar plate can be improved, and the convex part protruding towards the positioning hole is arranged on the edge part, and the thickness of the convex part is smaller than that of the edge part, so that the polar plate is not easy to fall off when the polar plate and a membrane electrode are stacked. The positioning holes are formed between the two electrode plates, so that a gap is formed between the two electrode plates at the positioning holes, the distance between the two adjacent electrode plates at the positioning holes can be increased, short circuit of the adjacent electrode plates is not easily caused after conductive impurities and water drops enter the positioning holes, and the safety of the fuel cell is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to fuel cell technical field, especially relates to a polar plate, and simultaneously, the utility model discloses a single cell with the polar plate and a stack with the single cell. BACKGROUND

[0002] At present, in the fuel cell assembly process, the insulation between adjacent bipolar plates usually utilizes the frame of membrane electrode between the two. To ensure the insulation effect, the frame size of the membrane electrode is slightly larger than the graphite bipolar plate. This process fine-tuning makes the frame of the membrane electrode effectively isolate the adjacent bipolar plate during the stacking process, thereby achieving the necessary insulation performance.

[0003] The bipolar plate includes a cathode plate and an anode plate. In the fuel cell assembly process, to improve the alignment and positioning effect of the bipolar plate and the membrane electrode, a corresponding positioning hole is usually provided on the frame of the polar plate and the membrane electrode. The polar plate and the membrane electrode are positioned on the positioning tool through the positioning hole, thereby realizing the positioning of multiple polar plates and membrane electrodes, and improving the stacking efficiency. However, after the fuel cell assembly is completed, conductive impurities and water droplets can easily enter the positioning hole, thereby causing short circuit between adjacent polar plates, which is not conducive to the safety of the fuel cell. SUMMARY

[0004] Therefore, the utility model aims at providing a polar plate to improve the safety of the fuel cell.

[0005] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0006] A polar plate has an edge portion arranged along the circumferential direction of the polar plate. A positioning hole is arranged on the edge portion. The positioning hole is used to position the polar plate when the core of the stack is stacked. A protruding portion is arranged on the edge portion and protrudes towards the positioning hole. The thickness of the protruding portion is less than the thickness of the edge portion.

[0007] Further, in the thickness direction of the polar plate, both surfaces of the protruding portion are recessed relative to the edge portion.

[0008] Further, the ratio M of the thickness d of the protruding portion to the thickness D of the edge portion satisfies 0.1≤M≤0.6.

[0009] Further, the thickness d of the protruding portion satisfies 0.2mm≤d≤1.2mm.

[0010] Further, the polar plate is rectangular. The positioning hole is arranged on the length direction and the width direction of the edge portion.

[0011] Further, the edge portion comprises two long edge portions arranged on two sides of the width direction of the polar plate, and two short edge portions respectively connected between the same ends of the two long edge portions;

[0012] The positioning hole comprises a first positioning hole arranged in the middle of one of the long edge portions, and a second positioning hole arranged on one of the short edge portions, and the second positioning hole is arranged close to the other long edge portion.

[0013] Further, the positioning hole is in the shape of "U", the protruding portion is in the shape of rectangle, and is connected with the bottom wall and two side walls of the positioning hole; the protruding portion and the two side walls of the positioning hole define a positioning space.

[0014] Further, the polar plate is made of graphite; and / or, the protruding portion is integrally formed with the polar plate.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] The polar plate has the positioning hole arranged on the edge portion, which is beneficial to the positioning of the polar plate, thereby improving the assembly efficiency of the polar plate, and the protruding portion protruding towards the positioning hole is arranged on the edge portion, and the thickness of the protruding portion is smaller than the thickness of the edge portion, when the polar plate and the membrane electrode are stacked, a gap is formed between the two at the position of the positioning hole, and the distance between the two adjacent polar plates at the position of the positioning hole is increased, and the conductive impurities and water drops entering the positioning hole are not easy to cause short circuit of the adjacent polar plates, thereby improving the safety of the fuel cell.

[0017] In addition, the two surfaces of the protruding portion are arranged to be recessed relative to the edge portion, so that the distance between the polar plate and the polar plates located on both sides of the polar plate in the positioning hole is increased from the thickness of the membrane electrode frame to the distance between the two adjacent protruding portions, and the conductive impurities or water drops are not easy to contact the adjacent polar plates at the same time, thereby greatly reducing the risk of short circuit of the polar plate, and further improving the safety of the fuel cell. The ratio M of the thickness d of the protruding portion to the thickness D of the edge portion is arranged in a range, which is beneficial to ensuring the strength of the protruding portion, and at the same time, the rationality of the distance between the two adjacent protruding portions is considered. The thickness range of the protruding portion can ensure that it has certain strength and stability during positioning, and is not easy to be damaged during installation or use due to being too thin, thereby ensuring the effective realization of the positioning function.

[0018] In addition, the edge portion is provided with positioning holes in the length direction and the width direction, which is beneficial to the positioning accuracy and stability of the polar plate. The position design of the first positioning hole and the second positioning hole can further improve the efficiency and accuracy of the polar plate in positioning. The protruding portion is in a rectangular shape, which is beneficial to increasing the area of the protruding portion. The protruding portion is connected with the bottom wall and the two side walls of the positioning hole, which is beneficial to improving the connecting strength between the protruding portion and the polar plate, thereby improving the structural stability of the protruding portion. Meanwhile, the positioning space is defined between the protruding portion and the two side walls of the positioning hole, which is also beneficial to ensuring the positioning effect of the positioning hole. The polar plate is made of graphite, which is beneficial to the processing and forming of the protruding portion. The protruding portion is integrally formed with the polar plate, which is beneficial to improving the processing efficiency and the connecting strength between the protruding portion and the polar plate.

[0019] In addition, another purpose of the utility model is to provide a single battery, including anode plate, cathode plate and membrane electrode arranged between the anode plate and the cathode plate, and the anode plate and the cathode plate are the polar plate as described above, and the frame of the membrane electrode is provided with the through hole corresponding to the positioning hole.

[0020] The single battery, by setting multiple polar plates as described above, is beneficial to reducing the risk of short circuit of the polar plate, and improving the safety of the fuel cell.

[0021] In addition, the utility model also provides a kind of electric pile, including the single battery as described above.

[0022] The electric pile, by setting the single battery as described above, is beneficial to improving the safety and stability of the electric pile. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings constituting a part of the utility model are used to provide further understanding of the utility model, and the illustrative embodiment of the utility model and its explanation are used to explain the utility model, and do not constitute undue limitation on the utility model. In the drawings:

[0024] Figure 1 The structural schematic diagram of the polar plate in one view according to the utility model embodiment one is shown;

[0025] Figure 2 The structural schematic diagram of the polar plate in another view according to the utility model embodiment one is shown;

[0026] Figure 3 The structural schematic diagram of the polar plate and membrane electrode in stacking state according to the utility model embodiment one is shown.

[0027] Mark explanation:

[0028] 1, polar plate;2, membrane electrode;

[0029] 101, first positioning hole; 102, second positioning hole; 103, protruding portion; 104, edge portion; 1041, long edge portion; 1042, short edge portion;

[0030] 201, frame; 2011, first through hole. DETAILED DESCRIPTION

[0031] 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.

[0032] In the description of the utility model, it should be noted that if the terms such as 'upper', 'lower', 'inner', 'back' and the like indicating the orientation or positional relationship appear, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model to having a specific orientation, being constructed and operated in a specific orientation, and therefore cannot be understood as limiting the utility model. In addition, if the terms such as 'first','second' and the like appear, they are also only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0033] The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0034] Embodiment one

[0035] The embodiment relates to a polar plate 1, which has an edge portion 104 arranged along the self circumferential direction as a whole, the edge portion 104 is provided with a positioning hole, the positioning hole is used for positioning the polar plate 1 when the core of the electric pile is stacked, the edge portion 104 is provided with a protruding portion 103 protruding to the positioning hole, and the thickness of the protruding portion 103 is smaller than the thickness of the edge portion 104.

[0036] The polar plate 1 described in the embodiment is beneficial to the positioning of the polar plate 1 by arranging the positioning hole on the edge portion 104, so that the assembly efficiency of the polar plate 1 can be improved, and the protruding portion 103 protruding to the positioning hole is arranged on the edge portion 104, the thickness of the protruding portion 103 is smaller than the thickness of the edge portion 104, when the polar plate 1 and the membrane electrode 2 are stacked, a gap is formed between the two at the position of the positioning hole, and the spacing between the adjacent two polar plates 1 at the positioning hole can be increased, and after the conductive impurities and water droplets enter the positioning hole, the adjacent polar plates 1 are not easy to short circuit, thereby improving the safety of the fuel cell.

[0037] Based on the overall introduction above, an exemplary structure of the polar plate 1 in the embodiment is shown in Figure 1 and Figure 2 The polar plate 1 can be specifically an anode plate or a cathode plate on a bipolar plate, wherein, Figure 3The diagram illustrates a structural example of two electrode plates 1 and a membrane electrode 2 stacked between them. In the stacked state, the frame 201 of the membrane electrode 2 is located between the edge portions 104 of the two adjacent electrode plates 1.

[0038] In a preferred embodiment, both surfaces of the protruding portion 103 are recessed relative to the edge portion 104 in the thickness direction of the electrode plate 1. That is, a gap is formed between both surfaces of the protruding portion 103 and the surface of the edge portion 104 on the same side in the thickness direction of the electrode plate 1.

[0039] like Figure 3 As shown, in the stacked state, the distance between two adjacent electrode plates 1 in the positioning holes is specifically the distance between two adjacent protrusions 103. This distance is obviously greater than the thickness of the frame 201 of the membrane electrode 2. Therefore, the protrusions 103 increase the distance between two adjacent electrode plates 1 in the positioning holes. Due to the presence of the protrusions 103, conductive impurities or water droplets are less likely to simultaneously contact adjacent electrode plates 1, thereby greatly reducing the risk of short circuits in the electrode plates 1 and further improving the safety of the fuel cell. In this embodiment, the protrusions 103 are preferably located in the middle of the thickness direction of the edge portion 104, which helps to further improve the structural stability of the protrusions 103.

[0040] In addition, the protruding portion 103 also helps to strengthen the structural strength at the positioning hole, thereby improving the overall structural stability of the electrode plate 1. Of course, it is also possible to make only one side surface of the protruding portion 103 recessed relative to the edge portion 104, or to make the protruding portion 103 close to the side of the edge portion 104, which also helps to improve the problem of short circuit of the electrode plate 1.

[0041] An exemplary structure of the positioning hole in this embodiment is as follows: Figure 1 As shown, the positioning hole is U-shaped, and the protruding portion 103 is rectangular, connected to the bottom wall and side walls of the positioning hole. A positioning space is defined between the protruding portion 103 and the side walls of the positioning hole. Here, the U-shaped positioning hole has the advantages of simple structure, easy molding, and good positioning effect. The rectangular shape of the protruding portion 103 helps to increase its area. The connection between the protruding portion 103 and the bottom wall and side walls of the positioning hole helps to improve the connection strength between the protruding portion 103 and the electrode plate 1, thereby improving the structural stability of the protruding portion 103. Simultaneously, the positioning space defined between the outer side of the protruding portion 103 and the side walls of the positioning hole, and the positioning space, through which the positioning post is inserted, helps to ensure the positioning effect of the positioning hole.

[0042] As a preferred implementation method, such as Figure 1As shown in the figure, the polar plate 1 is rectangular, and the edge portion 104 is provided with positioning holes in the length direction and the width direction. In specific implementation, the positioning holes can be matched with positioning columns on a positioning tool, and the positioning columns and the positioning holes are inserted and matched to improve the alignment effect of the polar plate 1 in the stack.

[0043] In the embodiment, the positioning effect of the polar plate 1 on the plane can be achieved by providing the positioning holes in the length direction and the width direction of the edge portion 104, and the polar plate 1 can be more accurately positioned at the required position in the stacking process of the polar plate 1, thereby improving the precision and stability of the polar plate 1 assembly.

[0044] Specifically, as shown in the figure, Figure 1 As shown in the figure, the edge portion 104 includes two long edge portions 1041 oppositely arranged on both sides of the polar plate 1 in the width direction, and two short edge portions 1042 respectively connected between the same ends of the two long edge portions 1041. The positioning holes include a first positioning hole 101 arranged in the middle of one long edge portion 1041, and a second positioning hole 102 arranged on one short edge portion 1042, and the second positioning hole 102 is arranged close to the other long edge portion 1041.

[0045] The first positioning hole 101 is located in the middle of the long edge portion 1041, which can provide a stable positioning point in the length direction and ensure the position accuracy of the polar plate 1 in the length direction. The second positioning hole 102 is arranged on the short edge portion 1042 close to the other long edge portion 1041, and the second positioning hole 102 is matched with the first positioning hole 101 to further improve the positioning efficiency and accuracy of the polar plate 1. Of course, in specific implementation, the positions and quantities of the first positioning hole 101 and the second positioning hole 102 can also be adaptively adjusted according to the use requirements.

[0046] As shown in the figure, Figure 2 In the embodiment, the ratio M of the thickness d of the protruding portion 103 to the thickness D of the edge portion 104 satisfies 0.1≤M≤0.6. In this way, the strength of the protruding portion 103 can be ensured, and the rationality of the distance between the adjacent two protruding portions 103 is also considered, which will not cause insufficient strength due to the too thin protruding portion 103, and will not affect the distance and safety between the adjacent polar plates 1 due to the too thick protruding portion 103.

[0047] When the ratio M is less than 0.1, the thickness of the protruding portion 103 is too thin and is easily damaged. When the ratio M is greater than 0.6, the thickness of the protruding portion 103 is too large, and the distance between the adjacent protruding portions 103 is too small, which is not conducive to solving the problem of short circuit of the polar plate 1. In specific implementation, the ratio M of the embodiment may, for example, be 0.1, 0.2, 0.3, 0.4, 0.5, or 0.6.

[0048] In addition, in the embodiment, the thickness d of the protruding portion 103 satisfies 0.2mm≤d≤1.2mm. In this way, the strength and stability of the protruding portion 103 during positioning can be ensured. Setting the lower limit of the thickness d of the protruding portion 103 to 0.2mm is conducive to avoiding that the protruding portion 103 is too thin and is damaged during installation or use. Setting the upper limit of the thickness to 1.2mm can avoid that the protruding portion 103 is too thick and affects the distance between the protruding portions 103 on the adjacent polar plate 1, and prevent the short circuit risk caused by the too small distance. In specific implementation, the thickness d of the protruding portion 103 may, for example, be 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1mm, or 1.2mm. In addition, in the embodiment, the width of the protruding portion 103 is less than the width of the positioning hole, which is conducive to ensuring the positioning effect of the positioning hole.

[0049] As a preferred embodiment, the polar plate 1 of the embodiment is made of graphite, which is conducive to the processing and molding of the protruding portion 103. In addition, graphite has good electrical conductivity, which helps to improve the current conduction efficiency of the polar plate 1 in the fuel cell, reduce the resistance loss, and thus improve the performance of the fuel cell. Graphite has good corrosion resistance to chemical substances in the fuel cell and can operate stably for a long time in a harsh working environment.

[0050] In the embodiment, the protruding portion 103 is integrally formed with the polar plate 1. The integrally formed manufacturing method can reduce the production steps, reduce the production cost, improve the production efficiency, and also improve the connection strength between the protruding portion 103 and the polar plate 1. In addition, the integrally formed protruding portion 103 and the polar plate 1 make the connection between the protruding portion 103 and the polar plate 1 more firm, can withstand greater external force and pressure, and are conducive to improving the overall structural strength of the polar plate 1.

[0051] In addition, in order to detect the short circuit condition of the polar plate 1, a voltage inspection method can be used. In specific operation, the open circuit voltage of each single cell is measured by a multimeter when the fuel cell is not working. If the voltage is abnormally low or zero, it indicates that the polar plate 1 has a short circuit condition.

[0052] In this embodiment, the electrode plate 1 has a protrusion 103 within the positioning hole, which increases the distance between adjacent electrode plates 1 to the distance between adjacent protrusions 103. This protrusion 103 cooperates with the frame 201 of the membrane electrode 2, which helps ensure the insulation between the electrode plates 1 during the assembly of the fuel cell stack. This reduces the risk of short circuits in the electrode plates 1 and improves the safety of the fuel cell. Simultaneously, the protrusion 103 does not affect the positioning performance of the electrode plates 1, thus ensuring the assembly efficiency of the electrode plates 1 in the fuel cell.

[0053] Example 2

[0054] This embodiment relates to a single cell, including an anode plate, a cathode plate, and a membrane electrode disposed between the anode plate and the cathode plate. The anode plate and the cathode plate are the electrode plates described in Embodiment 1, and the frame 201 of the membrane electrode 2 is provided with through holes corresponding to the positioning holes.

[0055] Specifically, such as Figure 3 As shown, the through holes include a first through hole 2011 disposed on the frame 201 of the membrane electrode 2 and corresponding to the first positioning hole 101, and a second through hole corresponding to the second through hole. The first through hole 2011 and the second through hole are also U-shaped. The membrane electrode 2 is inserted and fitted with the positioning post through the first through hole 2011 and the second through hole, thereby being positioned during the stacking process and having high positioning accuracy, which helps to improve the stacking effect of the membrane electrode 2. In specific stacking, the electrode plate 1 and the membrane electrode 2 are positioned alternately by the positioning post and stacked together.

[0056] The single cell described in this embodiment, by setting multiple electrode plates 1 as described above, helps to reduce the risk of short circuit of electrode plates 1, thereby improving the safety of the fuel cell.

[0057] Furthermore, this embodiment also relates to a fuel cell stack, including the single cell described above.

[0058] The fuel cell stack described in this embodiment, by incorporating the aforementioned single cell, helps to improve the safety and stability of the fuel cell stack.

[0059] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1.A plate, characterized in that: the plate (1) has an edge portion (104) arranged along the circumferential direction of the plate (1), the edge portion (104) is provided with a positioning hole for positioning the plate (1) when the core of the stack is stacked, the edge portion (104) is provided with a protruding portion (103) protruding towards the positioning hole, and the thickness of the protruding portion (103) is less than the thickness of the edge portion (104). 2.The plate according to claim 1, characterized in that: in the thickness direction of the plate (1), both surfaces of the protruding portion (103) are recessed relative to the edge portion (104). 3.The plate according to claim 1, characterized in that: the ratio M of the thickness d of the protruding portion (103) to the thickness D of the edge portion (104) satisfies: 0.1≤M≤0.6。 4.The plate according to claim 1, characterized in that: the thickness d of the protruding portion (103) satisfies: 0.2mm≤d≤1.2mm. 5.The plate according to claim 1, characterized in that: the plate (1) is rectangular; the positioning hole is arranged in the length direction and the width direction of the edge portion (104). 6.The plate according to claim 5, characterized in that: the edge portion (104) includes two long edge portions (1041) arranged on opposite sides of the plate (1) in the width direction, and two short edge portions (1042) connected between the same ends of the two long edge portions (1041), respectively; the positioning hole includes a first positioning hole (101) arranged in the middle of one of the long edge portions (1041), and a second positioning hole (102) arranged on one of the short edge portions (1042), and the second positioning hole (102) is arranged close to the other long edge portion (1041). 7.The plate according to claim 1, characterized in that: the positioning hole is "U"-shaped, the protruding portion (103) is rectangular, and is connected with the bottom wall and the two side walls of the positioning hole; the protruding portion (103) and the two side walls of the positioning hole define a positioning space. 8.The plate according to any one of claims 1 to 7, characterized in that: the plate (1) is made of graphite; and / or, the protruding portion (103) is integrally formed with the plate (1). 9.A single cell, characterized in that: it comprises an anode plate, a cathode plate, and a membrane electrode arranged between the anode plate and the cathode plate, and the anode plate and the cathode plate are the plate according to any one of claims 1 to 8, and the frame (201) of the membrane electrode (2) is provided with a through hole corresponding to the positioning hole. 10.A stack, characterized in that: it comprises the single cell according to claim 9.

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