Bipolar plate and fuel cell stack with same

Abstract

The bipolar plate comprises a first polar plate and a second polar plate, the first polar plate and the second polar plate are distributed in a stacked mode, a detection slot which is open outwards is defined between the first polar plate and the second polar plate, and the detection slot is used for being connected with a detection element in an inserted mode. A support reinforcing part is arranged between the first polar plate and the second polar plate and / or between the first polar plate and the second polar plate; and the support reinforcing part is distributed in an area corresponding to the detection slot. By constructing the support reinforcing part on the bipolar plate, the local strength of the position of the detection slot on the bipolar plate is increased, the rupture of the bipolar plate or the separation of the first polar plate and the second polar plate caused by overlarge internal stress of the detection slot is avoided, the internal leakage of the battery is further prevented, and the safety performance of the bipolar plate is improved; and the service life of the bipolar plate is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of electrochemical cell manufacturing, and in particular to a bipolar plate and a fuel cell stack having the same. Background Art

[0002] In the related art, the detection element is installed in the detection slot of the bipolar plate. The detection slot and the connecting line between the bipolar plate and the detection element provide support for the detection element. At the same time, the spring wire on the detection element and the contact position of the bipolar plate will generate stress. When the stress is too large, it will cause the glue of the bipolar plate to break, and then cause the cathode plate and the anode plate to separate or delaminate, and cracks in the bipolar plate. Furthermore, the cracks or separation of the bipolar plate will cause internal leakage of the battery, affecting the performance and durability of the fuel cell. Summary of the invention

[0003] In view of this, the present invention aims to propose a bipolar plate, which increases the local strength of the detection slot on the bipolar plate, avoids damage to the bipolar plate caused by excessive internal stress at the detection slot, prevents internal leakage of the battery, and improves the safety performance of the bipolar plate.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] A bipolar plate comprises: a first polar plate and a second polar plate, wherein the first polar plate and the second polar plate are stacked and arranged, and an outwardly open detection slot is defined between the first polar plate and the second polar plate, and the detection slot is used to plug in a detection element, and a support reinforcement portion is provided between the first polar plate, the second polar plate and / or the first polar plate and the second polar plate, and the support reinforcement portion is distributed in an area corresponding to the detection slot.

[0006] According to the bipolar plate of the present invention, by constructing a support reinforcement portion on the bipolar plate, the local strength of the bipolar plate at the location of the detection slot is increased, thereby avoiding excessive internal stress in the detection slot that causes the bipolar plate to rupture, thereby preventing internal leakage of the battery and improving the safety performance of the bipolar plate.

[0007] In addition, the bipolar plate according to the above embodiment of the present invention may also have the following additional technical features:

[0008] According to some embodiments of the present invention, the support reinforcement portion is configured as a reinforcement protrusion provided on the first pole plate and / or the second pole plate.

[0009] According to some embodiments of the present invention, the reinforcing protrusion is protrudingly provided on the surface of the first pole plate and / or the second pole plate.

[0010] According to some embodiments of the present invention, the first electrode plate is provided with the reinforcing protrusion on a surface on a side facing away from the second electrode plate; or the second electrode plate is provided with the reinforcing protrusion on a surface on a side facing away from the first electrode plate.

[0011] According to some embodiments of the present invention, there are at least two reinforcing protrusions, and the at least two reinforcing protrusions are spaced apart and distributed in areas corresponding to two side edges of the detection slot.

[0012] According to some embodiments of the present invention, there are two reinforcing protrusions, and both of the two reinforcing protrusions are arranged on the side of the first electrode plate away from the second electrode plate, and the two reinforcing protrusions are respectively located in areas corresponding to two side edges of the detection slot.

[0013] According to some embodiments of the present invention, a fuel port is further provided between the first electrode plate and the second electrode plate, and a sealing member is provided at the fuel port, and the sealing member is suitable for applying an elastic supporting force to the side wall of the detection slot.

[0014] According to some embodiments of the present invention, the support reinforcement portion includes two reinforcement flanges, and the two reinforcement flanges respectively apply elastic support forces to two opposite side walls of the detection slot.

[0015] According to some embodiments of the present invention, the support reinforcement portion is located outside the detection slot.

[0016] Another object of the present invention is to provide a fuel cell stack.

[0017] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0018] A fuel cell stack comprises the above-mentioned bipolar plate. The advantages of the fuel cell stack compared with the prior art are the same and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings constituting a part of the present invention 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 of the present invention. In the accompanying drawings:

[0020] Figure 1 FIG. 1 is a top view of a bipolar plate according to Embodiment 1 of the present invention.

[0021] Figure 2 4 is a front view of a bipolar plate according to Embodiment 1 of the present invention.

[0022] Figure 3 is a top view of a bipolar plate according to the second embodiment of the present invention.

[0023] Reference numerals:

[0024] 100, bipolar plate; 10a, detection slot; 10b, fuel port;

[0025] 101. Support reinforcement portion; 102. Sealing element. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0027] The following will refer to Figure 1-Figure 3 The present invention is described in detail with reference to embodiments.

[0028] like Figure 1-Figure 3 As shown, the bipolar plate 100 according to the present invention includes: a first pole plate and a second pole plate, the first pole plate and the second pole plate are stacked and distributed, and an outwardly open detection slot 10a is defined between the first pole plate and the second pole plate, the detection slot 10a is used to plug in the detection element, and a support reinforcement part 101 is provided between the first pole plate, the second pole plate and / or the first pole plate and the second pole plate, and the support reinforcement part 101 is distributed in the area corresponding to the detection slot 10a.

[0029] Specifically, one of the first electrode plate and the second electrode plate is an anode plate, and the other is a cathode plate. The cathode plate and the anode plate are stacked and bonded together to form a bipolar plate 100. A detection slot 10a (such as Figure 1 , Figure 2 , Figure 3 The dotted line shown is a schematic diagram of the detection slot 10a located in the bipolar plate 100), and a support reinforcement portion 101 is constructed at a position close to the detection slot 10a on one end surface of the bipolar plate 100, and the support reinforcement portion 101 can strengthen the local strength of the bipolar plate 100 at the position of the detection slot 10a.

[0030] According to the bipolar plate 100 of the present invention, by constructing a support reinforcement portion 101 on the bipolar plate 100, the local strength of the position where the detection slot 10a is located on the bipolar plate 100 is increased, thereby avoiding excessive internal stress of the detection slot 10a causing the bipolar plate 100 to rupture, thereby preventing internal leakage of the battery, and improving the safety performance of the bipolar plate 100.

[0031] In the related art, when the detection element is inserted into the detection slot 10a, stress will be generated at the contact position between the spring wire provided on the detection element and the bipolar plate 100. When the stress is too large, the glue of the bipolar plate 100 will break, and then the first and second polar plates will separate or delaminate, and cracks will be generated in the bipolar plate 100. Furthermore, the cracks or separation of the bipolar plate 100 will cause internal leakage of the battery, affecting the performance and durability of the fuel cell. The bipolar plate 100 according to the embodiment of the present invention enhances the local strength of the bipolar plate 100 by constructing a support reinforcement on the bipolar plate 100, thereby avoiding the rupture of the bipolar plate 100 caused by excessive stress.

[0032] like Figure 1 , Figure 2 As shown, in some embodiments of the present invention, the support reinforcement portion 101 is configured as a reinforcement protrusion provided on the first electrode plate and / or the second electrode plate. By providing the reinforcement protrusion, the local strength of the position of the bipolar plate 100 close to the detection slot 10a can be improved, so that the detection slot 10a of the bipolar plate 100 does not break when subjected to a large stress, thereby improving the safety of the bipolar plate 100.

[0033] like Figure 1 , Figure 2 As shown, in some embodiments of the present invention, the reinforcing protrusion is protrudingly arranged on the surface of the first electrode plate and / or the second electrode plate. That is, the reinforcing protrusion is integrally formed with the bipolar plate 100 and protrudingly arranged on the surface of the first electrode plate and / or the second electrode plate, thereby increasing the local strength of the surface of the bipolar plate 100.

[0034] like Figure 1 , Figure 2 As shown, in some embodiments of the present invention, the reinforcing protrusion can be set as an arched protrusion with an arc-shaped outer contour. Specifically, the reinforcing protrusion can also be set as a hemispherical protrusion, or the reinforcing protrusion can also be set as a reinforcing protrusion of other shapes with high strength, which will not be repeated here.

[0035] like Figure 1 , Figure 2 As shown, in some embodiments of the present invention, the first electrode plate is provided with a reinforcing protrusion on a surface of a side away from the second electrode plate; or, the second electrode plate is provided with a reinforcing protrusion on a surface of a side away from the first electrode plate.

[0036] Specifically, the reinforcing protrusion can be constructed on the side surface of the first polar plate facing away from the second polar plate, thereby strengthening the local strength of the bipolar plate 100; the reinforcing protrusion can also be constructed on the side surface of the second polar plate facing away from the first polar plate, thereby strengthening the local strength of the bipolar plate 100; the reinforcing protrusion can also be constructed on the first polar plate and the second polar plate, that is, the reinforcing protrusion is constructed on the opposite end surfaces of the bipolar plate 100 and is arranged close to the test slot, thereby strengthening the local strength of the bipolar plate 100, so that the bipolar plate 100 can withstand greater stress when the detection element is inserted into the test slot.

[0037] In some embodiments of the present invention, there are at least two reinforcing protrusions, and the at least two reinforcing protrusions are spaced apart and distributed in the areas corresponding to the two sides of the detection slot 10a. By providing at least two reinforcing protrusions, the strength of the local position of the bipolar plate 100 can be greatly increased, wherein the more the number of reinforcing protrusions, the greater the strength improvement of the local area of ​​the bipolar plate 100 by the reinforcing protrusions.

[0038] Specifically, the number of reinforcing protrusions can be set to 2, 3, 4, 5 or more. For example, when the number of reinforcing protrusions is set to 2, the 2 reinforcing protrusions are spaced apart and distributed in the areas corresponding to the two sides of the detection slot 10a; when the number of reinforcing protrusions is set to 4, the 4 reinforcing protrusions are spaced apart and distributed in the areas corresponding to the two sides of the detection slot 10a, and the 4 reinforcing protrusions are arranged along the insertion direction of the detection slot 10a and distributed in the areas corresponding to the two sides of the detection slot 10a. The specific number of reinforcing protrusions constructed on the bipolar plate 100 is set according to actual production requirements, and will not be repeated here.

[0039] In some embodiments of the present invention, there are two reinforcing protrusions, and both reinforcing protrusions are arranged on the side of the first electrode plate away from the second electrode plate, and the two reinforcing protrusions are respectively located in the areas corresponding to the two side edges of the detection slot 10a. By arranging reinforcing protrusions on the two side edges of the detection slot 10a to enhance the local strength of the detection slot 10a of the bipolar plate 100, the strength of the areas corresponding to the two side edges of the detection slot 10a of the bipolar plate 100 is made the same, thereby avoiding the uneven strength of the two side edges of the detection slot 10a, thereby avoiding stress concentration on the low-strength side edges and causing the bipolar plate 100 to rupture. That is, arranging reinforcing protrusions on the two side edges of the detection slot 10a enhances the strength of the bipolar plate 100 and also improves the stability of the bipolar plate 100, thereby improving the safety performance of the bipolar plate 100.

[0040] like Figure 3As shown, in some embodiments of the present invention, a fuel port 10b is further provided between the first electrode plate and the second electrode plate, and a sealing member 102 is provided at the fuel port 10b, and the sealing member 102 is suitable for applying an elastic supporting force to the side wall of the detection slot 10a. That is to say, by constructing the sealing member 102 around the fuel port 10b, extending the sealing member 102 along the plugging direction of the detection slot 10a, and constructing the supporting reinforcement portion 101 near the detection slot 10a, the strength inside the detection slot 10a is greatly enhanced, and the bipolar plate 100 is prevented from being broken due to excessive stress generated between the detection element and the detection slot 10a when plugged, thereby reducing the scrap rate of the bipolar plate 100 and further reducing the production cost of the bipolar plate 100.

[0041] In some embodiments of the present invention, the support reinforcement portion 101 includes two reinforcement flanges, and the two reinforcement flanges respectively apply elastic support forces to the two opposite side walls of the detection slot 10a. By constructing a reinforcement flange near the detection slot 10a, the strength of the detection slot 10a is enhanced, and the excessive stress generated between the detection element and the detection slot 10a when plugged in is avoided, which causes the bipolar plate 100 to rupture. At the same time, when the reinforcement flange is constructed at the connection position of the first and second plates in the detection slot 10a, the reinforcement flange can also enhance the connection strength between the first and second plates, and avoid the excessive stress generated between the detection element and the detection slot 10a when plugged in, which causes the first and second plates to separate or delaminate, thereby extending the service life of the bipolar plate 100.

[0042] In some embodiments of the present invention, the support reinforcement part 101 is located outside the detection slot 10a. Specifically, the support reinforcement part 101 can be a reinforcement protrusion convexly arranged on the surface of the bipolar plate 100 to increase the strength of the local position of the bipolar plate 100; the strength of the detection slot 10a position of the bipolar plate 100 is secondary strengthened by reinforcing the protrusion and reinforcing the flange, so that the detection slot 10a can withstand greater stress, avoid the bipolar plate 100 from breaking at the detection slot 10a position, or avoid the first and second polar plates from being separated due to stress, thereby improving the safety performance of the bipolar plate 100 and extending the service life of the bipolar plate 100.

[0043] In some embodiments of the present invention, the support reinforcement portion 101 may also be a reinforcement flange constructed in the detection slot 10a to increase the strength of the bipolar plate 100 at the detection slot 10a position; the support reinforcement portion 101 may also be a reinforcement protrusion protruding from the surface of the bipolar plate 100 and a reinforcement flange constructed in the detection slot 10a.

[0044] The fuel cell stack according to the present invention includes the bipolar plate 100 described above.

[0045] According to the fuel cell stack of the present invention, by providing a support reinforcement portion 101 on the bipolar plate 100, the bipolar plate 100 can withstand greater internal stress, thereby avoiding rupture of the bipolar plate 100 or separation of the first polar plate and the second polar plate, thereby avoiding internal leakage of the fuel cell stack, improving the safety performance of the fuel cell stack, and extending the service life of the fuel cell stack.

[0046] In some embodiments of the present invention, the fuel cell stack further includes a membrane electrode assembly, which is alternately stacked between the bipolar plates, and a seal is constructed on the membrane electrode assembly. By constructing the seal on the membrane electrode assembly, the strength inside the detection slot 10a is greatly enhanced, and the bipolar plate 100 is prevented from being broken due to excessive stress between the detection element and the detection slot 10a when it is plugged in, thereby reducing the scrap rate of the fuel cell stack and further reducing the production cost of the fuel cell stack.

[0047] Specifically, the membrane electrode assembly is configured with a fuel port 10b corresponding to the bipolar plate, and the seal is configured near the fuel port 10b of the membrane electrode assembly. The seal 102 extends along the plugging direction of the detection slot 10a, so that a support reinforcement portion 101 is configured near the detection slot 10a to further enhance the local strength of the fuel cell.

[0048] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A bipolar plate, characterized in that: include: A first electrode plate and a second electrode plate, the first electrode plate and the second electrode plate are stacked and arranged, and a detection slot (10a) open outward is defined between the first electrode plate and the second electrode plate, the detection slot (10a) is used to plug in a detection element, and a support reinforcement portion (101) is provided between the first electrode plate, the second electrode plate and / or the first electrode plate and the second electrode plate, and the support reinforcement portion (101) is distributed in an area corresponding to the detection slot (10a).

2. The bipolar plate according to claim 1, characterized in that: The support reinforcement portion (101) is configured as a reinforcement protrusion provided on the first electrode plate and / or the second electrode plate.

3. The bipolar plate according to claim 2, characterized in that: The reinforcing protrusion is protrudingly arranged on the surface of the first electrode plate and / or the second electrode plate.

4. The bipolar plate according to claim 2, characterized in that: The first electrode plate is provided with the reinforcing protrusion on a surface of a side away from the second electrode plate; Alternatively, the second electrode plate is provided with the reinforcing protrusion on a surface of a side away from the first electrode plate.

5. The bipolar plate according to claim 2, characterized in that: There are at least two reinforcement protrusions, and the at least two reinforcement protrusions are spaced apart and distributed in areas corresponding to two side edges of the detection slot (10a).

6. The bipolar plate according to claim 2, characterized in that: There are two reinforcing protrusions, and both of the two reinforcing protrusions are arranged on the side of the first electrode plate away from the second electrode plate, and the two reinforcing protrusions are respectively located in areas corresponding to the two side edges of the detection slot (10a).

7. The bipolar plate according to claim 1, characterized in that: A fuel port (10b) is also provided between the first electrode plate and the second electrode plate, and a sealing member (102) is provided at the fuel port (10b). The sealing member (102) is suitable for applying an elastic supporting force to the side wall of the detection slot (10a).

8. The bipolar plate according to claim 7, characterized in that: The support reinforcement portion (101) comprises two reinforcement flanges, and the two reinforcement flanges respectively apply elastic support forces to two opposite side walls of the detection slot (10a).

9. The bipolar plate according to claim 1, characterized in that: The support reinforcement portion (101) is located outside the detection slot (10a).

10. A fuel cell stack, characterized in that: A bipolar plate (100) according to any one of claims 1 to 9 is provided.

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