Bipolar plate air tightness detection device

Abstract

A bipolar plate air tightness detection device comprises an upper end plate and a lower end plate, the top surface of the lower end plate is provided with a lower abutting part used for supporting the bottom surface of a bipolar plate, the lower abutting part is used for blocking the bottom of a functional hole, the bottom surface of the upper end plate is provided with an upper abutting part used for pressing the top surface of the bipolar plate, and the upper abutting part is used for blocking the top of the functional hole. The upper end plate is arranged above the lower end plate, the upper end plate is connected to the lower end plate, and a detection hole penetrating to the lower abutting part is formed in the side face of the lower end plate; according to the utility model, the medium is conveyed into the detection hole, the leakage condition of the medium is observed after the functional hole and the detection hole are filled with the medium for a period of time, and if no leaked medium exists, the gas tightness of the bipolar plate is better, the dislocation quantity between the polar plates is less, and the performance of a battery manufactured by using the bipolar plate is normal; and if the medium leaks, the air tightness of the bipolar plate is poor, and the performance of the battery manufactured by using the bipolar plate does not reach the standard.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cells, in particular to a bipolar plate air tightness detection device. Background Art

[0002] A fuel cell stack is formed by stacking multiple cells, wherein a single cell includes a bipolar plate formed by bonding two polar plates, the bipolar plate having three chambers, namely a hydrogen chamber, an oxygen chamber and a coolant chamber. The three chambers are required to have good airtightness to prevent medium leakage during use. During the process of bonding the two polar plates, the polar plates may be misaligned, resulting in a decrease in the airtightness of the bipolar plate, causing the performance of the battery manufactured using the bipolar plate to fail to meet the standards. Utility Model Content

[0003] The utility model aims to provide a bipolar plate air tightness detection device to solve the technical problem that the battery performance does not meet the standard due to the bipolar plates with misaligned polar plates used in the manufacture of the battery.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a bipolar plate air tightness detection device, wherein the bipolar plate is provided with a functional hole extending from its top surface to its bottom surface; the detection device comprises an upper end plate and a lower end plate, the top surface of the lower end plate is provided with a lower abutment portion for supporting the bottom surface of the bipolar plate, the lower abutment portion is used to seal the bottom of the functional hole, the bottom surface of the upper end plate is provided with an upper abutment portion for pressing on the top surface of the bipolar plate, the upper abutment portion is used to seal the top of the functional hole, the upper end plate is arranged above the lower end plate, the upper end plate is connected to the lower end plate, and the side surface of the lower end plate is provided with a detection hole extending through the lower abutment portion.

[0005] Optionally, it also includes an upper sealing ring and a lower sealing ring;

[0006] The bottom surface of the bipolar plate is provided with a lower boss along the edge of the functional hole, the lower abutment portion is used to support the lower boss, the bottom surface of the bipolar plate is provided with a first lower sealing groove around the lower boss, the top surface of the lower end plate is provided with a second lower sealing groove corresponding to the first lower sealing groove, and the lower sealing ring is provided in the first lower sealing groove and / or the second lower sealing groove to block the gap between the lower boss and the lower abutment portion;

[0007] An upper boss is provided on the top surface of the bipolar plate along the edge of the functional hole, and the lower abutment portion is used to press on the upper boss. A first upper sealing groove is provided on the top surface of the bipolar plate around the upper boss, and a second upper sealing groove is provided on the bottom surface of the upper end plate corresponding to the first upper sealing groove. The upper sealing ring is provided in the first upper sealing groove and / or the second upper sealing groove to seal the gap between the upper boss and the upper abutment portion.

[0008] Optionally, it also includes a guide column, which is arranged on one of the bottom surface of the upper abutting part and the top surface of the lower abutting part, and the other is provided with a guide hole matching the guide column, and the guide column is inserted into the guide hole.

[0009] Optionally, the functional holes include hydrogen holes, coolant holes and oxygen holes, the top surface of the lower end plate is provided with a plurality of lower abutment portions, the upper end plate is provided with a plurality of upper abutment portions, each of the upper abutment portions corresponds one-to-one to the hydrogen holes, the coolant holes and the oxygen holes, each of the lower abutment portions corresponds one-to-one to the hydrogen holes, the coolant holes and the oxygen holes, and the side surface of the lower end plate is provided with a plurality of detection holes, the detection holes respectively penetrate to the corresponding lower abutment portions that block the hydrogen holes, the coolant holes and the oxygen holes.

[0010] Optionally, the bipolar plate is provided with two groups of functional holes opposite to each other along the first direction, and the two groups of functional holes are respectively defined as a first group of holes and a second group of holes, the hydrogen holes, coolant holes and oxygen holes in the functional holes are arranged in sequence along the second direction, and the arrangement order of the first group of holes and the second group of holes along the second direction is opposite, the detection holes include hydrogen detection holes, liquid detection holes and oxygen detection holes, the liquid detection holes penetrate to the lower abutment part of the coolant holes corresponding to the first group of holes that block the first group of holes, the hydrogen detection holes penetrate to the lower abutment part of the hydrogen holes corresponding to the second group of holes that block the second group of holes, and the oxygen detection holes penetrate to the lower abutment part of the oxygen holes corresponding to the second group of holes that block the second group of holes.

[0011] Optionally, the trajectory of the detection hole along the length direction is L-shaped.

[0012] Optionally, it also includes an upper fixing plate and a lower fixing plate, the upper fixing plate is arranged above the upper end plate, the upper fixing plate is connected to the upper end plate, the lower fixing plate is arranged below the lower end plate, the lower fixing plate is connected to the lower end plate, the upper fixing plate is provided with an upper fixing hole, the lower fixing plate is provided with a lower fixing hole, and fasteners pass through the upper fixing hole and the lower fixing hole to connect the upper fixing plate and the lower fixing plate.

[0013] Optionally, a plurality of upper long grooves are provided on the bottom surface of the upper end plate, two of the upper long grooves extending along the first direction are provided along two opposite sides of the first direction, and two of the upper long grooves extending along the second direction are provided along two opposite sides of the second direction;

[0014] The bottom surface of the upper fixing plate is provided with a plurality of upper positioning holes corresponding to the upper long grooves one by one, the bottom surface of the upper fixing plate is provided with an upper plate groove at a position corresponding to the upper positioning holes, and the groove bottom of the upper plate groove is provided with an upper connecting hole;

[0015] The detection device also includes a plurality of upper screws and a plurality of upper positioning blocks corresponding to the upper long slots one by one, the upper positioning block including an upper positioning column, an upper plate block and an upper positioning protrusion arranged in sequence from top to bottom, the upper positioning column matches the upper positioning hole, the upper positioning column is inserted into the upper positioning hole, the upper plate block is provided with an upper plate hole that runs from its bottom surface to its top surface, the bottom surface of the upper plate block is provided with an upper groove at a position corresponding to the upper plate hole, the upper screw passes through the upper plate hole and the upper connecting hole in sequence to connect the upper positioning block and the upper fixing plate, the nail head of the upper screw is hidden in the upper groove, the upper positioning protrusion matches the upper long slot, and the upper positioning protrusion is inserted into the upper long slot;

[0016] The connection structure between the lower fixing plate and the lower end plate is the same as the connection structure between the upper fixing plate and the upper end plate.

[0017] Optionally, a pole plate placement area is provided on the top surface of the lower end plate, and a plurality of material extraction troughs are provided on opposite sides of the top surface of the lower end plate along the second direction, the material extraction troughs on both sides are symmetrically arranged along the center plane of the lower end plate perpendicular to the second direction, and each of the material extraction troughs extends to the pole plate placement area.

[0018] Optionally, the diameter of the detection hole is 4 mm to 6 mm.

[0019] Compared with the prior art, the bipolar plate air tightness detection device of the utility model has the following beneficial effects:

[0020] In the utility model, the upper end plate and the lower end plate sandwich the bipolar plate in the middle, wherein the upper abutment of the bottom surface of the upper end plate is pressed against the top surface of the bipolar plate and blocks the top of the functional hole of the bipolar plate, and the lower abutment of the top surface of the lower end plate is supported on the bottom surface of the bipolar plate and blocks the bottom of the functional hole of the bipolar plate to close the functional hole. Furthermore, a detection hole penetrating through the lower abutment is provided on the side of the lower end plate, so that the detection hole can be connected to the functional hole, and a medium is transported into the detection hole so that the medium fills the functional hole and the detection hole and is maintained for a period of time, and the leakage of the medium is observed. If there is no leakage of the medium, the air tightness of the bipolar plate is good, the misalignment between the plates is small, and the performance of the battery manufactured with the bipolar plate is normal; if there is leakage of the medium, the air tightness of the bipolar plate is poor, the misalignment between the plates is large, and the performance of the battery manufactured with the bipolar plate does not meet the standard, and the bipolar plate is repaired or scrapped. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the utility model.

[0022] Figure 2 It is a cross-sectional view of the utility model.

[0023] Figure 3 for Figure 2 A partial enlarged view of part A in the middle.

[0024] Figure 4 The explosion of the utility model Figure 1 .

[0025] Figure 5 for Figure 4 A partial enlarged view of part B in the middle.

[0026] Figure 6 for Figure 4 A partial enlarged view of part C in the middle.

[0027] Figure 7 for Figure 4 A partial enlarged view of part D in the middle.

[0028] Figure 8 The explosion of the utility model Figure 2 .

[0029] Fig. 9 for Figure 8 A partial enlarged view of part E in the middle.

[0030] 1. Upper fixing plate; 11. Upper fixing hole; 12. Upper positioning hole; 13. Upper disk groove; 2. Lower fixing plate; 21. Lower fixing hole; 3. Upper end plate; 31. Upper abutment portion; 32. Second upper sealing groove; 33. Upper long groove; 4. Lower end plate; 41. Lower abutment portion; 42. Detection hole; 43. Second lower sealing groove; 44. Material extraction trough; 5. Bipolar plate; 51. Functional hole; 52. Upper boss; 53. Lower boss; 54. First upper sealing groove; 55. First lower sealing groove; 6. Upper sealing ring; 7. Lower sealing ring; 8. Guide column; 9. Guide hole; 10. Upper positioning block; 101. Upper positioning column; 102. Upper disk block; 103. Upper positioning protrusion. DETAILED DESCRIPTION

[0031] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0032] In the description of the present invention, it should be understood that the terms "top", "bottom", "inside", "outside", "circumferential", etc. 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, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] like Figures 1 to 9 As shown, a bipolar plate 5 airtightness detection device of the utility model is provided, and the bipolar plate 5 is provided with a functional hole 51 extending from its top surface to the bottom surface; the detection device comprises an upper end plate 3 and a lower end plate 4, the top surface of the lower end plate 4 is provided with a lower abutment portion 41 for supporting the bottom surface of the bipolar plate 5, and the lower abutment portion 41 is used to block the bottom of the functional hole 51, the bottom surface of the upper end plate 3 is provided with an upper abutment portion 31 for pressing on the top surface of the bipolar plate 5, and the upper abutment portion 31 is used to block the top of the functional hole 51, the upper end plate 3 is provided above the lower end plate 4, the upper end plate 3 is connected to the lower end plate 4, and the side surface of the lower end plate 4 is provided with a detection hole 42 extending through the lower abutment portion 41.

[0035] In the above technical solution, the upper end plate 3 and the lower end plate 4 sandwich the bipolar plate 5 in the middle, wherein the upper abutment portion 31 of the bottom surface of the upper end plate 3 is pressed on the top surface of the bipolar plate 5 and blocks the top of the functional hole 51 of the bipolar plate 5, and the lower abutment portion 41 of the top surface of the lower end plate 4 is supported on the bottom surface of the bipolar plate 5 and blocks the bottom of the functional hole 51 of the bipolar plate 5 to close the functional hole 51. Furthermore, the side surface of the lower end plate 4 is provided with a detection hole 42 that penetrates to the lower abutment portion 41, so that the detection hole 42 can be connected to The functional hole 51 is used to transport the medium into the detection hole 42. After the medium fills the functional hole 51 and the detection hole 42 for a period of time, the leakage of the medium is observed. If there is no leakage of the medium, the air tightness of the bipolar plate 5 is good, the misalignment between the plates is small, and the performance of the battery manufactured with the bipolar plate 5 is normal; if there is leakage of the medium, the air tightness of the bipolar plate 5 is poor, the misalignment between the plates is large, and the performance of the battery manufactured with the bipolar plate 5 does not meet the standards, and the bipolar plate 5 is repaired or scrapped.

[0036] Furthermore, it also includes an upper sealing ring 6 and a lower sealing ring 7;

[0037] The bottom surface of the bipolar plate 5 is provided with a lower boss 53 along the edge of the functional hole 51, the lower abutment portion 41 is used to support the lower boss 53, the bottom surface of the bipolar plate 5 is provided with a first lower sealing groove 55 around the lower boss 53, the top surface of the lower end plate 4 is provided with a second lower sealing groove 43 corresponding to the first lower sealing groove 55, and the lower sealing ring 7 is provided in the first lower sealing groove 55 and / or the second lower sealing groove 43 to block the gap between the lower boss 53 and the lower abutment portion 41;

[0038] An upper boss 52 is provided on the top surface of the bipolar plate 5 along the edge of the functional hole 51, and the lower abutment portion 41 is used to press on the upper boss 52. A first upper sealing groove 54 is provided on the top surface of the bipolar plate 5 around the upper boss 52, and a second upper sealing groove 32 is provided on the bottom surface of the upper end plate 3 corresponding to the first upper sealing groove 54. The upper sealing ring 6 is provided in the first upper sealing groove 54 and / or the second upper sealing groove 32 to seal the gap between the upper boss 52 and the upper abutment portion 31; wherein the upper sealing ring 6 and the lower sealing ring 7 are respectively used to enhance the sealing between the lower boss 53 and the lower abutment portion 41 and the sealing between the upper boss 52 and the upper abutment portion 31, so as to prevent the medium from leaking from between the lower boss 53 and the lower abutment portion 41 and between the upper boss 52 and the upper abutment portion 31.

[0039] Furthermore, it also includes a guide column 8, which is arranged on one of the bottom surface of the upper abutment portion 31 and the top surface of the lower abutment portion 41, and the other is provided with a guide hole 9 matching the guide column 8, and the guide column 8 is inserted into the guide hole 9 to facilitate the alignment between the upper end plate 3 and the lower end plate 4, wherein the guide column 8 and the guide hole 9 can be a clearance fit relationship.

[0040] Furthermore, the functional holes 51 include hydrogen holes, coolant holes and oxygen holes, the top surface of the lower end plate 4 is provided with a plurality of lower abutment portions 41, the upper end plate 3 is provided with a plurality of upper abutment portions 31, each of the upper abutment portions 31 corresponds to the hydrogen holes, the coolant holes and the oxygen holes one by one, each of the lower abutment portions 41 corresponds to the hydrogen holes, the coolant holes and the oxygen holes one by one, and the side of the lower end plate 4 is provided with a plurality of detection holes 42, the detection holes 42 respectively penetrate to the corresponding lower abutment portions 41 that block the hydrogen holes, the coolant holes and the oxygen holes, and the lower end plate 4 is provided with at least three detection holes 42, so that the detection holes 42 can detect the hydrogen holes, the coolant holes and the oxygen holes respectively.

[0041] Further, the bipolar plate 5 is provided with two groups of functional holes 51 opposite to each other along the first direction, and the two groups of functional holes 51 are respectively defined as a first group of holes and a second group of holes. The hydrogen holes, coolant holes and oxygen holes in the functional holes 51 are sequentially arranged at intervals along the second direction, and the arrangement order of the first group of holes and the second group of holes along the second direction is opposite. The detection holes 42 include hydrogen detection holes, liquid detection holes and oxygen detection holes. The liquid detection holes penetrate to the lower abutment portion 41 of the coolant holes corresponding to the first group of holes that block the first group of holes, the hydrogen detection holes penetrate to the lower abutment portion 41 of the hydrogen holes corresponding to the second group of holes that block the second group of holes, and the oxygen detection holes penetrate to the lower abutment portion 41 of the oxygen holes corresponding to the second group of holes that block the second group of holes, so that the coolant holes of the first group of holes, the oxygen holes and the hydrogen holes of the second group of holes can be detected in one detection. After the first detection is completed, the bipolar plate 5 is rotated to detect the positions of the other three holes.

[0042] Furthermore, the detection hole 42 has an L-shaped trajectory along the length direction, which facilitates the processing of the detection hole 42 on the lower end plate 4 .

[0043] Furthermore, it also includes an upper fixing plate 1 and a lower fixing plate 2, the upper fixing plate 1 is arranged above the upper end plate 3, the upper fixing plate 1 is connected to the upper end plate 3, the lower fixing plate 2 is arranged below the lower end plate 4, the lower fixing plate 2 is connected to the lower end plate 4, the upper fixing plate 1 is provided with an upper fixing hole 11, the lower fixing plate 2 is provided with a lower fixing hole 21, and fasteners pass through the upper fixing hole 11 and the lower fixing hole 21 to connect the upper fixing plate 1 and the lower fixing plate 2; wherein the upper end plate 3 and the lower end plate 4 are connected by the upper fixing plate 1 and the lower fixing plate 2 to compress the bipolar plate 5.

[0044] Furthermore, the bottom surface of the upper end plate 3 is provided with a plurality of upper long grooves 33, two of the upper long grooves 33 extending in the first direction are arranged on two sides opposite to each other in the first direction, and two of the upper long grooves 33 extending in the second direction are arranged on two sides opposite to each other in the second direction; the bottom surface of the upper fixing plate 1 is provided with a plurality of upper positioning holes 12 corresponding to the upper long grooves 33 one by one, and the bottom surface of the upper fixing plate 1 is provided with an upper plate groove 13 at a position corresponding to the upper positioning hole 12, and the bottom of the upper plate groove 13 is provided with an upper connecting hole; the detection device also includes a plurality of upper screws and a plurality of upper positioning blocks 10 corresponding to the upper long grooves 33 one by one, the upper positioning block 10 includes an upper positioning column 101, an upper plate block 102 and an upper positioning protrusion 103 which are arranged in sequence from top to bottom, and the upper positioning column 101 and the upper positioning protrusion 103 The upper positioning hole 12 matches the positioning hole 12, the upper positioning column 101 is inserted into the upper positioning hole 12, the upper plate block 102 is provided with an upper plate hole extending from its bottom surface to its top surface, and the bottom surface of the upper plate block 102 is provided with an upper groove corresponding to the position of the upper plate hole, the upper screw passes through the upper plate hole and the upper connecting hole in sequence to connect the upper positioning block 10 and the upper fixing plate 1, the nail head of the upper screw is hidden in the upper groove, the upper positioning protrusion 103 matches the upper long groove 33, the upper positioning protrusion 103 is inserted into the upper long groove 33, so that the upper fixing plate 1 fixes the position of the upper end plate 3 in the horizontal direction through the upper positioning block 10; further, the connection structure between the lower fixing plate 2 and the lower end plate 4 is the same as the connection structure between the upper fixing plate 1 and the upper end plate 3.

[0045] Furthermore, a pole plate placement area is provided on the top surface of the lower end plate 4, and a plurality of material extraction grooves 44 are provided on opposite sides of the top surface of the lower end plate 4 along the second direction, and the material extraction grooves 44 on both sides are symmetrically arranged along the center plane of the lower end plate 4 perpendicular to the second direction, and each of the material extraction grooves 44 extends to the pole plate placement area; wherein, when the bipolar plate 5 is located between the upper end plate 3 and the lower end plate 4, the bipolar plate 5 and the pole plate placement area are completely fitted, and when the detection is completed, the bipolar plate 5 can be separated from the upper end plate 3 by applying an upward force to the bipolar plate 5 at the material extraction groove 44.

[0046] Furthermore, the diameter of the detection hole 42 is 4 mm to 6 mm, preferably 5 mm, to ensure that the medium can be smoothly injected into the detection hole 42 .

[0047] Furthermore, the specific connection methods of fixed setting and fixed connection refer to the relative position relationship of two components that can be fixedly connected, including fixing by connecting parts, fixing by welding, fixing by adhesives, fixing by integral molding, and fixing by snap connections.

[0048] Furthermore, the connecting parts include fasteners, straps, ties, pneumatic connecting elements, hydraulic connecting elements, flange plates, Velcro, and buttons.

[0049] In summary, the embodiment of the utility model provides a device for detecting the air tightness of a bipolar plate 5, and its technical effects are:

[0050] In the present invention, the upper end plate 3 and the lower end plate 4 sandwich the bipolar plate 5 in the middle, wherein the upper abutment portion 31 of the bottom surface of the upper end plate 3 is pressed on the top surface of the bipolar plate 5 and blocks the top of the functional hole 51 of the bipolar plate 5, and the lower abutment portion 41 of the top surface of the lower end plate 4 is supported on the bottom surface of the bipolar plate 5 and blocks the bottom of the functional hole 51 of the bipolar plate 5 to close the functional hole 51. Furthermore, the side surface of the lower end plate 4 is provided with a detection hole 42 penetrating to the lower abutment portion 41, so that the detection hole 42 can be connected to the functional hole 51. The functional hole 51 is used to transport the medium into the detection hole 42, so that the medium fills the functional hole 51 and the detection hole 42 and is kept for a period of time, and the leakage of the medium is observed. If there is no leakage of the medium, the air tightness of the bipolar plate 5 is good, the misalignment between the plates is small, and the performance of the battery manufactured with the bipolar plate 5 is normal; if there is leakage of the medium, the air tightness of the bipolar plate 5 is poor, the misalignment between the plates is large, and the performance of the battery manufactured with the bipolar plate 5 is not up to standard, and the bipolar plate 5 is repaired or scrapped.

[0051] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A bipolar plate air tightness detection device, wherein the bipolar plate (5) is provided with a functional hole (51) extending from the top surface to the bottom surface thereof; It is characterized in that The invention comprises an upper end plate (3) and a lower end plate (4), wherein the top surface of the lower end plate (4) is provided with a lower abutting portion (41) for supporting the bottom surface of the bipolar plate (5), and the lower abutting portion (41) is used to block the bottom of the functional hole (51); the bottom surface of the upper end plate (3) is provided with an upper abutting portion (31) for pressing on the top surface of the bipolar plate (5), and the upper abutting portion (31) is used to block the top of the functional hole (51); the upper end plate (3) is arranged above the lower end plate (4), the upper end plate (3) is connected to the lower end plate (4), and the side surface of the lower end plate (4) is provided with a detection hole (42) penetrating to the lower abutting portion (41).

2. The bipolar plate air tightness detection device according to claim 1, characterized in that: It also includes an upper sealing ring (6) and a lower sealing ring (7); The bottom surface of the bipolar plate (5) is provided with a lower boss (53) along the edge of the functional hole (51); the lower abutment portion (41) is used to support the lower boss (53); the bottom surface of the bipolar plate (5) is provided with a first lower sealing groove (55) around the lower boss (53); the top surface of the lower end plate (4) is provided with a second lower sealing groove (43) corresponding to the first lower sealing groove (55); the lower sealing ring (7) is provided in the first lower sealing groove (55) and / or the second lower sealing groove (43) to seal the gap between the lower boss (53) and the lower abutment portion (41); The top surface of the bipolar plate (5) is provided with an upper boss (52) along the edge of the functional hole (51); the lower abutment portion (41) is used to press on the upper boss (52); the top surface of the bipolar plate (5) is provided with a first upper sealing groove (54) around the upper boss (52); the bottom surface of the upper end plate (3) is provided with a second upper sealing groove (32) corresponding to the first upper sealing groove (54); the upper sealing ring (6) is provided in the first upper sealing groove (54) and / or the second upper sealing groove (32) to seal the gap between the upper boss (52) and the upper abutment portion (31).

3. The bipolar plate air tightness detection device according to claim 1, characterized in that: It also includes a guide column (8), wherein the guide column (8) is arranged on one of the bottom surface of the upper abutting portion (31) and the top surface of the lower abutting portion (41), and the other is provided with a guide hole (9) matching the guide column (8), and the guide column (8) is inserted into the guide hole (9).

4. The bipolar plate air tightness detection device according to claim 1, characterized in that: The functional holes (51) include hydrogen holes, coolant holes and oxygen holes. The top surface of the lower end plate (4) is provided with a plurality of lower abutment portions (41). The upper end plate (3) is provided with a plurality of upper abutment portions (31). Each of the upper abutment portions (31) corresponds to the hydrogen holes, the coolant holes and the oxygen holes one by one. Each of the lower abutment portions (41) corresponds to the hydrogen holes, the coolant holes and the oxygen holes one by one. The side surface of the lower end plate (4) is provided with a plurality of detection holes (42). The detection holes (42) respectively penetrate to the corresponding lower abutment portions (41) that block the hydrogen holes, the coolant holes and the oxygen holes.

5. The bipolar plate air tightness detection device according to claim 4, characterized in that: The bipolar plate (5) is provided with two groups of functional holes (51) that are opposite to each other along a first direction. The two groups of functional holes (51) are defined as a first group of holes and a second group of holes, respectively. The hydrogen holes, coolant holes and oxygen holes in the functional holes (51) are sequentially arranged at intervals along a second direction. The arrangement order of the first group of holes and the second group of holes along the second direction is opposite. The detection holes (42) include hydrogen detection holes, liquid detection holes and oxygen detection holes. The liquid detection holes penetrate to the lower abutment portion (41) of the coolant holes that block the first group of holes. The hydrogen detection holes penetrate to the lower abutment portion (41) of the hydrogen holes that block the second group of holes. The oxygen detection holes penetrate to the lower abutment portion (41) of the oxygen holes that block the second group of holes.

6. The bipolar plate air tightness detection device according to claim 1, characterized in that: The detection hole (42) has an L-shaped track along the length direction.

7. The bipolar plate air tightness detection device according to claim 1, characterized in that: It also includes an upper fixing plate (1) and a lower fixing plate (2), wherein the upper fixing plate (1) is arranged above the upper end plate (3), and the upper fixing plate (1) is connected to the upper end plate (3), and the lower fixing plate (2) is arranged below the lower end plate (4), and the lower fixing plate (2) is connected to the lower end plate (4), the upper fixing plate (1) is provided with an upper fixing hole (11), and the lower fixing plate (2) is provided with a lower fixing hole (21), and a fastener passes through the upper fixing hole (11) and the lower fixing hole (21) to connect the upper fixing plate (1) and the lower fixing plate (2).

8. The bipolar plate air tightness detection device according to claim 7, characterized in that: The bottom surface of the upper end plate (3) is provided with a plurality of upper long grooves (33), two of the upper long grooves (33) extending in a first direction are arranged on two opposite sides of the first direction, and two of the upper long grooves (33) extending in a second direction are arranged on two opposite sides of the second direction; The bottom surface of the upper fixing plate (1) is provided with a plurality of upper positioning holes (12) corresponding one to one to the upper long grooves (33); the bottom surface of the upper fixing plate (1) is provided with an upper plate groove (13) at a position corresponding to the upper positioning holes (12); and the bottom of the upper plate groove (13) is provided with an upper connecting hole; The detection device further comprises a plurality of upper screws and a plurality of upper positioning blocks (10) corresponding to the upper long grooves (33) one by one, the upper positioning block (10) comprising an upper positioning column (101), an upper plate block (102) and an upper positioning protrusion (103) arranged in sequence from top to bottom, the upper positioning column (101) matches the upper positioning hole (12), the upper positioning column (101) is inserted into the upper positioning hole (12), the upper plate block (102) is provided with an upper plate hole extending from its bottom surface to its top surface, the bottom surface of the upper plate block (102) is provided with an upper groove at a position corresponding to the upper plate hole, the upper screw passes through the upper plate hole and the upper connecting hole in sequence to connect the upper positioning block (10) and the upper fixing plate (1), the nail head of the upper screw is hidden in the upper groove, the upper positioning protrusion (103) matches the upper long groove (33), and the upper positioning protrusion (103) is inserted into the upper long groove (33); The connection structure between the lower fixing plate (2) and the lower end plate (4) is the same as the connection structure between the upper fixing plate (1) and the upper end plate (3).

9. The bipolar plate air tightness detection device according to claim 1, characterized in that: The top surface of the lower end plate (4) is provided with a pole plate placement area, and the top surface of the lower end plate (4) is provided with a plurality of material taking grooves (44) on two opposite sides along the second direction, the material taking grooves (44) on both sides are symmetrically arranged along the center plane of the lower end plate (4) perpendicular to the second direction, and each of the material taking grooves (44) extends to the pole plate placement area.

10. The bipolar plate air tightness detection device according to claim 1, characterized in that: The diameter of the detection hole (42) is 4 mm to 6 mm.

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