Polar plate, bipolar plate and fuel cell

Abstract

The invention discloses a polar plate, a bipolar plate and a fuel cell, the polar plate comprises a polar plate body, the side surface of the polar plate body is provided with an annular sealing sinking groove, and the polar plate body is provided with annular support bulges on the two sides of the sealing sinking groove respectively; the two supporting protrusions and the sealing sinking groove jointly define an injection molding channel, and supporting planes are formed at the ends of the supporting protrusions. According to the polar plate disclosed by the embodiment of the invention, the injection molding mold can be supported by arranging the first supporting surface, so that deformation or damage caused by direct contact between the sealing sinking groove and the injection molding mold can be avoided, the sealing effect of the injection molding channel can be improved, and the clamping force borne by the polar plate body can be reduced; the probability of deformation of the pole plate body is reduced, the yield of the pole plate is improved, and the practicability of the pole plate is improved.

Description

Technical Field

[0001] The present invention relates to the field of electrochemical cells, and in particular to a polar plate, a bipolar plate and a fuel cell. Background Art

[0002] In the related art, when the electrode plate is sealed using the liquid injection molding (LIM) process, the electrode plate needs to be pressed during the processing to avoid leakage in the injection molding channel. If the flow field surface of the electrode plate is not parallel, a higher clamping force is required, which may cause local cracking and leakage, resulting in permanent damage to the electrode plate. There is room for improvement. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to provide a plate that can avoid deformation or damage caused by direct contact between the sealing sink and the injection molding mold, and is conducive to reducing the probability of deformation of the plate body and improving the yield rate of the plate.

[0004] According to an embodiment of the present invention, the electrode plate includes: a electrode body, a side of the electrode body is provided with an annular sealing groove, and the electrode body is respectively formed with annular supporting protrusions on both sides of the sealing groove, the two supporting protrusions and the sealing groove together define an injection molding channel, and the ends of the supporting protrusions are formed as supporting planes.

[0005] According to the electrode plate of the embodiment of the present invention, the injection molding mold can be supported by setting the first supporting surface, which can avoid deformation or damage caused by direct contact between the sealing groove and the injection molding mold, and can improve the sealing effect of the injection molding channel, which is beneficial to reduce the clamping force on the electrode plate body, reduce the probability of deformation of the electrode plate body, improve the yield rate of the electrode plate, and enhance the practicality of the electrode plate.

[0006] According to some embodiments of the electrode plates of the present invention, the protrusion height of the supporting protrusion is 8 μm-10 μm.

[0007] According to some embodiments of the electrode plates of the present invention, the distance between the two supporting protrusions is greater than the width of the sealing groove.

[0008] According to some embodiments of the electrode plates of the present invention, the distances between the two supporting protrusions and the sealing recess are equal.

[0009] According to the electrode plates of some embodiments of the present invention, the side walls of the two supporting protrusions facing each other are smoothly connected to the inner side wall of the sealing groove.

[0010] According to some embodiments of the polar plates of the present invention, at least one of the two supporting protrusions is inclined in a direction away from the polar plate body toward a direction approaching each other.

[0011] The invention also provides a bipolar plate.

[0012] A bipolar plate according to an embodiment of the present invention includes: a polar plate according to any of the above embodiments.

[0013] The present invention further provides a fuel cell.

[0014] A fuel cell according to an embodiment of the present invention includes: a polar plate according to any one of the above embodiments; or a bipolar plate according to any one of the above embodiments.

[0015] The advantages of the bipolar plate, the fuel cell and the polar plate compared with the prior art are the same and will not be described in detail here.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 is a schematic diagram of a plate according to an embodiment of the present invention;

[0019] Figure 2 is a cross-sectional view of a plate according to an embodiment of the present invention;

[0020] Figure 3 It is a schematic diagram of the cooperation between the electrode plate and the injection molding mold according to another embodiment of the present invention.

[0021] Reference numerals:

[0022] Plate 100, injection molding mold 200,

[0023] The plate body 1 , the supporting protrusion 11 , the supporting plane 111 , the sealing groove 12 , the deepening space 13 , and the injection molding channel 2 . DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0025] Hereinafter, a plate 100 according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0026] like Figure 1-Figure 3 As shown, the electrode plate 100 according to the embodiment of the present invention includes: a electrode plate body 1, a side of the electrode plate body 1 is provided with an annular sealing groove 12, and the electrode plate body 1 is formed with annular supporting protrusions 11 on both sides of the sealing groove 12, the two supporting protrusions 11 and the sealing groove 12 together define an injection molding channel 2, and the end of the supporting protrusion 11 is formed as a supporting plane 111.

[0027] In this way, the sealing groove 12 can be prevented from directly contacting the injection molding mold 200 and causing deformation or damage, and the sealing effect of the injection molding channel 2 can be improved, which is beneficial to reducing the clamping force on the plate body 1 and reducing the probability of deformation of the plate body 1.

[0028] For example, refer to Figure 1-Figure 3 As shown, the plate 100 can be a monopolar plate or one of the bipolar plates, such as an anode plate or a cathode plate. The plate 100 includes a plate body 1, a side of the plate body 1 is formed with a downwardly recessed sealing groove 12, the sealing groove 12 is annular, and the sealing groove 12 is arranged to extend circumferentially around the plate body 1, and a protruding support protrusion 11 is also provided on the same side of the plate body 1, and two support protrusions 11 are provided, and the two support protrusions 11 are respectively arranged on the inner and outer sides of the sealing groove 12, and the support protrusion 11 is annular, and the support protrusion 11 is arranged to extend circumferentially around the plate body 1, and a deepening space 13 is defined between the two support protrusions 11, and the deepening space 13 and the sealing groove 12 together define an injection molding channel 2.

[0029] At the same time, the end of the support protrusion 1 can be set to form a support plane 111, and the support plane 111 is parallel to the side of the plate body 1. During the injection molding process, when the injection molding mold 200 is covered to the plate body 1, the injection molding mold 200 can be supported on the support plane 111 to close the injection molding channel 2. At this time, liquid silicone rubber can be injected into the injection molding channel 2 to process a sealing ring, which is used to cooperate with other components (such as another one in the bipolar plate) to seal the reaction area located in the middle of the plate body 100 along the circumferential direction.

[0030] In this way, direct contact between the injection molding mold 200 and the sealing groove 1 can be avoided to prevent deformation or damage of the sealing groove 12, thereby improving the processing quality of the sealing ring, and avoiding large-area contact between the injection molding mold 200 and the electrode 100, which can improve the sealing performance of the injection molding channel 2, so that the clamping force required between the injection molding mold 200 and the electrode body 1 is smaller, thereby reducing the probability of permanent deformation or damage of the electrode body 1.

[0031] According to the electrode plate 100 of the embodiment of the present invention, the injection molding mold 200 can be supported by setting the first supporting surface 111, which can avoid deformation or damage caused by direct contact between the sealing groove 12 and the injection molding mold 200, and can improve the sealing effect of the injection molding channel 2, which is beneficial to reduce the clamping force on the electrode plate body 1, reduce the probability of deformation of the electrode plate body 1, improve the yield rate of the electrode plate 100, and enhance the practicality of the electrode plate 100.

[0032] In some embodiments of the present invention, the protrusion height of the support protrusion 11 is 8μm-10μm. For example, the height of the support protrusion 11 protruding from the side of the plate body 1 can be 8.5μm; or, the height of the support protrusion 11 protruding from the side of the plate body 1 can be 9μm; or, the height of the support protrusion 11 protruding from the side of the plate body 1 can be 9.5μm, and the present application does not impose any restrictions on this. Through the above-mentioned settings, it is possible to avoid the support protrusion 11 from causing adverse effects on the installation of the plate 100, thereby improving the reliability of the plate 100.

[0033] In some embodiments of the present invention, the distance between the two support protrusions 11 is greater than the width of the sealing groove 12. Figure 2 As shown, the two support protrusions 11 can be arranged to maintain a certain distance from the edge of the corresponding side of the sealing groove 12; or, one of the two support protrusions 11 can be arranged to maintain a certain distance from the edge of the corresponding side of the sealing groove 12. In this way, the distance between the two support protrusions 11 can be greater than the width of the sealing groove 12, so that the width of the portion of the sealing ring located between the two support protrusions 11 is larger, and the contact area between the sealing ring and the plate body 1 can be increased. In this way, the installation stability of the sealing ring can be improved, and it is conducive to realizing the diversified arrangement of the plate 100.

[0034] In some embodiments of the present invention, the distances between the two support protrusions 11 and the sealing recess 12 are equal. Figure 2 As shown, the two support protrusions 11 can be arranged to maintain a certain distance from the edge of the corresponding side of the sealing groove 12, and the distances between the two support protrusions 11 and the sealing groove 12 are equal, so that the structure of the plate body 1 is uniform, and the overall structural strength of the plate body 1 is improved. Therefore, the reliability of the plate 100 is improved.

[0035] In some embodiments of the present invention, the side walls of the two support protrusions 11 facing each other are smoothly connected to the inner side wall of the sealing groove 12. Figure 3As shown, two support protrusions 11 can be respectively arranged at the two side edges of the sealing groove 12, and the side walls of the two support protrusions 11 facing each other are smoothly connected to the inner side wall of the sealing groove 12, so that the sealing groove 12 is smoothly connected to the deepened space 13, thereby configuring the inner wall of the injection molding channel 2 to be a smooth plane, which can avoid the flow dead angle in the injection molding channel 2. In this way, the processing quality of the sealing ring can be improved, which is conducive to improving the reliability of the electrode 100.

[0036] In some embodiments of the present invention, at least one of the two support protrusions 11 is inclined in a direction away from the plate body 1 toward a direction close to each other. Figure 3 As shown, one of the two support protrusions 11 can be arranged to extend obliquely in the direction away from the plate body 1 toward the direction close to each other, or one of the two support protrusions 11 can be arranged to extend obliquely in the direction away from the plate body 1 toward the direction close to each other, so that the width of the injection molding channel 2 gradually decreases in the direction away from the plate body 1, so that the support protrusion 11 can limit the sealing ring, improve the installation stability of the sealing ring, and improve the processing quality of the sealing ring. In this way, the reliability of the plate 100 is improved.

[0037] The invention also provides a bipolar plate.

[0038] The bipolar plate according to an embodiment of the present invention comprises: the electrode plate 100 according to any of the above embodiments. The electrode plate 100 may be one of a positive electrode plate and a negative electrode plate, and the sealing ring on the electrode plate 100 is used to seal with the other of the positive electrode plate and the negative electrode plate.

[0039] According to the bipolar plate of the embodiment of the present invention, the injection molding mold 200 can be supported by setting the first supporting surface 111, which can avoid deformation or damage caused by direct contact between the sealing groove 12 and the injection molding mold 200, and can improve the sealing effect of the injection molding channel 2, which is beneficial to reduce the clamping force on the plate body 1, reduce the probability of deformation of the plate body 1, improve the yield rate of the plate 100, improve the practicality of the plate 100, and improve the reliability of the bipolar plate.

[0040] The present invention further provides a fuel cell.

[0041] A fuel cell according to an embodiment of the present invention includes: a polar plate according to any one of the above embodiments; or a bipolar plate according to any one of the above embodiments.

[0042] The fuel cell according to the embodiment of the present invention has good performance and high reliability.

[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0044] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0045] In the description of the present invention, "plurality" means two or more.

[0046] In the description of the present invention, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0047] In the description of the present invention, “on”, “over” and “above” a first feature from a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0048] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0049] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A polar plate (100), characterized in that: include: A plate body (1), wherein a side surface of the plate body (1) is provided with an annular sealing recess (12), and the plate body (1) is respectively provided with annular supporting protrusions (11) on both sides of the sealing recess (12), the two supporting protrusions (11) and the sealing recess (12) jointly define an injection molding channel (2), and the ends of the supporting protrusions (11) are formed as supporting planes (111).

2. The electrode plate (100) according to claim 1, characterized in that: The protrusion height of the supporting protrusion (11) is 8 μm-10 μm.

3. The electrode plate (100) according to claim 1, characterized in that: The distance between the two supporting protrusions (11) is greater than the width of the sealing groove (12).

4. The electrode plate (100) according to claim 1, characterized in that: The distances between the two supporting protrusions (11) and the sealing recess (12) are equal.

5. The electrode plate (100) according to claim 1, characterized in that: The side walls of the two supporting protrusions (11) facing each other are smoothly connected to the inner side wall of the sealing groove (12).

6. The electrode plate (100) according to claim 5, characterized in that: At least one of the two supporting protrusions (11) is inclined in a direction away from the polar plate body (1) towards a direction approaching each other.

7. A bipolar plate, characterized in that: include: The electrode plate (100) according to any one of claims 1 to 6.

8. A fuel cell, characterized in that: include: The polar plate (100) according to any one of claims 1 to 6; or the bipolar plate according to claim 7.

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