Fuel cell bipolar plate seal structure

Abstract

The utility model relates to fuel cell bipolar plate technical field, concretely is a kind of fuel cell bipolar plate sealing structure, including two groups of symmetrical sealing element, sealing element includes the side plate of substrate and substrate corresponding plug-in, and one substrate rear end surface is close to the edge of two sides and is provided with positioning slot, another substrate rear end surface is provided with positioning block in the corresponding place of positioning slot, and the substrate with positioning slot is provided with perforation in the corresponding place of second screw hole, and the mounting groove between substrate and side plate is provided with polar plate main body;The fuel cell bipolar plate sealing structure is sealed by being provided with two sealing elements, respectively to two clamping plate main body is sealed cooperation, and the sealing strip on substrate is matched with the sealing groove plug-in cooperation on side plate, and plug-in cooperation is inserted in column and slot, and flat head screw is screwed through counterbore and the first screw hole thread connection on plug-in column, realize that substrate and side plate are sealed to the polar plate main body clamping groove below, and cooperate first rubber pad and second rubber pad increase the sealing property of being adhered to polar plate main body.

Description

Technical Field

[0001] This utility model relates to the field of fuel cell bipolar plate technology, specifically a fuel cell bipolar plate sealing structure. Background Technology

[0002] In hydrogen fuel cells, bipolar plates are separated by an electrolyte conductive membrane. The function of the bipolar plates is to provide gas flow channels, prevent hydrogen and oxygen in the cell chamber from crossing each other, and establish a current path between the series-connected anode and cathode. The bipolar plate sealing structure of the fuel cell is the core technology to ensure the performance and safety of the stack. Therefore, the bipolar plates need to have good sealing performance.

[0003] The utility model CN218939736U discloses a bipolar plate sealing structure for a fuel cell, including a main board. The main board has a flow groove, and both ends of the flow groove have an inlet and an outlet, respectively. The main board also has a sealing groove, and the bottom of the sealing groove has equal-spaced limiting protrusions. A sealing plate is provided at the bottom of the main board relative to the sealing groove. The sealing plate can be embedded into the sealing groove, and a third groove is provided on the sealing plate relative to the limiting protrusions.

[0004] The above technical solution includes a sealing plate, limiting protrusions, and sealant. During installation, sealant is dripped into the sealing groove, and then the sealing plate is embedded into the sealing groove. The sealant is then squeezed to fill the entire sealing groove. Through the double sealing of the sealing plate and sealant, the problem of insufficient sealing during bipolar plate installation is solved. However, after long-term use, the bipolar plate needs to be disassembled and replaced. The seals are replaced along with the bipolar plate, resulting in material waste. Furthermore, loose assembly between the bipolar plate and the seals can affect the cross-contamination of hydrogen, air, and coolant, thus affecting the independent operation of each chamber. Utility Model Content

[0005] The purpose of this invention is to provide a fuel cell bipolar plate sealing structure to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A bipolar plate sealing structure for a fuel cell includes two sets of symmetrical sealing elements. Each sealing element includes a base plate and a side plate that are inserted into the base plate. One base plate has a positioning groove near its two side edges on its rear end face. The other base plate has a positioning block on its rear end face corresponding to the positioning groove. The positioning block has symmetrical second screw holes. The base plate with the positioning groove has a through hole corresponding to the second screw hole. A fixing bolt is provided in the through hole. The front end face of the base plate has an installation groove in the middle. A sealing strip is provided on the front end face of the base plate near the installation groove. A sealing groove is provided on the side plate corresponding to the sealing strip. The electrode plate body is provided in the installation groove between the base plate and the side plate.

[0008] The electrode plate body has slots on both sides near the top.

[0009] Furthermore, a first rubber pad is provided at the top of the mounting groove of the substrate corresponding to the card slot, and a second rubber pad is provided at the top of the mounting groove of the side plate corresponding to the card slot. The width of the outer wall of the first rubber pad and the second rubber pad is adapted to the width of the inner wall of the card slot.

[0010] In this invention, the first rubber pad and the second rubber pad work together to fit into the corresponding slot, increasing the sealing performance when the electrode body is fitted and inserted with the substrate and side plate.

[0011] Specifically, the sealing strip is U-shaped, and it is bonded and fixed to the substrate. The width of the outer wall of the sealing strip is adapted to the width of the inner wall of the sealing groove.

[0012] In this invention, the sealing strip and the sealing groove are interlocked to increase the stability of the substrate and side plate assembly and to improve airtightness.

[0013] It should be noted that the front end face of the substrate is provided with a post near the four corners, and the top of the post is provided with a first screw hole.

[0014] In this invention, the insertion post facilitates quick and easy assembly of the base plate and side plate.

[0015] Furthermore, each side plate has a insertion hole corresponding to the insertion post, and each front end of the side plate has a countersunk hole corresponding to the insertion hole. Each countersunk hole has a flat-head screw, and the end of the flat-head screw passes through the countersunk hole and is threadedly connected to the first screw hole.

[0016] In this invention, the top of the flat-head screw is flush with the top of the countersunk hole, which increases the overall aesthetics. The flat-head screw is threaded to the first screw hole, which enables the side plate and the insert to be tightly inserted and fixed, thereby achieving stable installation of the side plate and the base plate.

[0017] It is worth noting that the positioning block and one of the base plates are integrally formed, the width of the outer wall of the positioning block is adapted to the width of the inner wall of the positioning groove, and the fixing bolt passes through the through hole and extends from the positioning groove to the second screw hole for threaded connection.

[0018] In this invention, the positioning block and the positioning groove are inserted and installed to achieve a tight fit between the two sets of sealing elements, and with the cooperation of the fixing bolt, the two sets of sealing elements are fixedly connected.

[0019] In addition, the width of the outer wall of the electrode plate body is adapted to the width of the inner wall of the mounting groove between the substrate and the side plate.

[0020] In this invention, the electrode plate body is inserted into the corresponding mounting slot, and the combination of the base plate and the side plate seals and protects the electrode plate body located below the slot, reducing the mutual mixing of internal hydrogen, air and coolant, and preventing the independent operation of each chamber.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] 1. This utility model provides two sealing elements to seal the two clamping plate bodies respectively. The sealing strip on the base plate is inserted into the sealing groove on the side plate, and the insertion post is inserted into the slot. The flat-head screw passes through the countersunk hole and is threaded into the first screw hole on the insertion post. This achieves the clamping and sealing of the base plate and the side plate under the base plate body slot. The first rubber pad and the second rubber pad are used to increase the sealing performance of the base plate body.

[0023] 2. This utility model achieves the combination and fixation of two sets of sealing components by setting a positioning block and positioning groove to be inserted and matched, and with the cooperation of a fixing bolt, the fixing bolt passes through the through hole on one base plate and is threadedly connected to the first screw hole on the positioning block on another base plate. The first rubber pad and the second rubber pad initially seal the connection port between the base plate, the side plate and the electrode plate body. The sealing strip and the sealing groove are inserted and matched to further seal the electrode plate body between the base plate and the side plate. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall assembly structure of this utility model;

[0025] Figure 2 This is a schematic diagram of the sealing component separation structure of this utility model;

[0026] Figure 3 This is a schematic diagram of the exploded structure of the sealing element of this utility model;

[0027] Figure 4 This is a schematic diagram of the main structure of the electrode plate of this utility model;

[0028] Figure 5This is a schematic diagram of the side plate structure of this utility model;

[0029] Figure 6 This is a schematic diagram of the substrate structure of this utility model;

[0030] Figure 7 This is a side view of the substrate of this utility model.

[0031] The meanings of the labels in the diagram are as follows:

[0032] 1. Sealing element; 10. Base plate; 100. Perforation; 101. Sealing strip; 102. Insert post; 103. First screw hole; 104. First rubber gasket; 105. Positioning groove; 11. Side plate; 110. Countersunk hole; 111. Flat head screw; 112. Insertion hole; 113. Sealing groove; 114. Second rubber gasket;

[0033] 2. Electrode body; 20. Card slot;

[0034] 3. Fixed bolt;

[0035] 4. Positioning block; 40. Second screw hole. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] Please see Figures 1-7 This embodiment provides a technical solution:

[0038] A fuel cell bipolar plate sealing structure includes two sets of symmetrical sealing elements 1. Each sealing element 1 includes a base plate 10 and a side plate 11 that is inserted into the base plate 10. Each of the four corners on the front end face of the base plate 10 is provided with a post 102, and each post 102 is provided with a first screw hole 103 at the top.

[0039] In this invention, the insertion post 102 facilitates the quick and easy assembly of the base plate 10 and the side plate 11.

[0040] Furthermore, each side plate 11 has a socket 112 corresponding to the insertion post 102, and each front end face of the side plate 11 has a countersunk hole 110 corresponding to the socket 112. Each countersunk hole 110 has a flat-head screw 111, and the end of the flat-head screw 111 passes through the countersunk hole 110 and is threadedly connected to the first screw hole 103.

[0041] In this utility model, the top of the flat-head screw 111 is flush with the top of the countersunk hole 110, which increases the overall aesthetics. The flat-head screw 111 is threadedly connected to the first screw hole 103, so as to achieve tight insertion and fixation between the side plate 11 and the insertion post 102, thereby achieving stable installation of the side plate 11 and the base plate 10.

[0042] Specifically, one of the substrates 10 has a positioning groove 105 near the two side edges on the rear end face, and another substrate 10 has a positioning block 4 corresponding to the positioning groove 105 on the rear end face. The positioning block 4 has symmetrical second screw holes 40. The substrate 10 with the positioning groove 105 has a through hole 100 corresponding to the second screw hole 40. A fixing bolt 3 is provided in the through hole 100. The positioning block 4 and one of the substrates 10 are integrally formed. The width of the outer wall of the positioning block 4 is adapted to the width of the inner wall of the positioning groove 105. The fixing bolt 3 passes through the through hole 100 and extends from the positioning groove 105 to the second screw hole 40 for threaded connection.

[0043] In this utility model, the positioning block 4 is inserted into the positioning groove 105 to achieve a tight fit between the two sets of sealing elements 1, and with the cooperation of the fixing bolt 3, the two sets of sealing elements 1 are fixedly connected.

[0044] It should be noted that a mounting groove is provided in the middle of the front end face of the substrate 10, and a sealing strip 101 is provided near the mounting groove on the front end face of the substrate 10. A sealing groove 113 is provided on the side plate 11 at the position corresponding to the sealing strip 101. The sealing strip 101 is U-shaped and is bonded and fixed to the substrate 10. The width of the outer wall of the sealing strip 101 is adapted to the width of the inner wall of the sealing groove 113.

[0045] In this invention, the sealing strip 101 and the sealing groove 113 are inserted into each other to increase the stability of the combination of the base plate 10 and the side plate 11 and to increase the airtightness.

[0046] Furthermore, an electrode body 2 is provided in the mounting groove between the substrate 10 and the side plate 11;

[0047] Secondly, slots 20 are provided on both sides of the electrode body 2 near the top.

[0048] It is worth noting that a first rubber pad 104 is provided at the top of the mounting groove of the substrate 10 corresponding to the slot 20, and a second rubber pad 114 is provided at the top of the mounting groove of the side plate 11 corresponding to the slot 20. The width of the outer wall of the first rubber pad 104 and the second rubber pad 114 is adapted to the width of the inner wall of the slot 20.

[0049] In this invention, the first rubber pad 104 and the second rubber pad 114 work together to insert into the corresponding slot 20, thereby increasing the sealing performance when the electrode body 2 is attached to the substrate 10 and the side plate 11.

[0050] Furthermore, the width of the outer wall of the electrode body 2 is adapted to the width of the inner wall of the mounting groove between the substrate 10 and the side plate 11.

[0051] In this invention, the electrode plate body 2 is inserted into the corresponding mounting groove, and the base plate 10 and the side plate 11 are combined to seal and protect the electrode plate body 2 located below the slot 20, thereby reducing the mutual flow of internal hydrogen, air and coolant and affecting the independent operation of each chamber.

[0052] In this embodiment of the fuel cell bipolar plate sealing structure, when in use, the corresponding electrode plate body 2 is first inserted into the mounting groove on the substrate 10, and then the corresponding side plate 11 is inserted into the insertion hole 112 on the substrate 10 through the insertion post 102. The first rubber pad 104 and the second rubber pad 114 are inserted into the corresponding slot 20. The flat head screw 111 is inserted into the countersunk hole 110 and threadedly connected to the first screw hole 103 on the corresponding insertion post 102 to realize the combination and fixation of the side plate 11 and the substrate 10.

[0053] Two electrode plate bodies 2, one a cathode plate and the other an anode plate, form a bipolar plate and are inserted and installed with corresponding seals 1. The two seals 1 are inserted and engaged with the positioning grooves 105 through positioning blocks 4. The fixing bolts 3 pass through the through holes 100 and are threadedly connected to the second screw holes 40 to achieve stable combination and fixation between the two seals 1. When the internal electrode plate body 2 needs to be replaced after long-term use, or when the seals 1 need to be disassembled and replaced, the fixing bolts 3 are taken out from the second screw holes 40 and the flat-head screws 111 are taken out from the first screw holes 103 to achieve disassembly and replacement of the electrode plate body 2 or the corresponding seals 1, reducing material waste.

Claims

1. A fuel cell bipolar plate sealing structure, comprising two sets of symmetrical seals, characterized in that: The sealing element includes a base plate and a side plate that are inserted into the base plate. One of the base plates has a positioning groove near the two side edges on its rear end face. The other base plate has a positioning block corresponding to the positioning groove on its rear end face. The positioning block has a second screw hole symmetrically provided. The base plate with the positioning groove has a through hole corresponding to the second screw hole. A fixing bolt is provided in the through hole. The front end face of the base plate has an installation groove in the middle. The front end face of the base plate has a sealing strip near the installation groove. The side plate has a sealing groove corresponding to the sealing strip. The mounting groove between the base plate and the side plate has an electrode plate body. The electrode plate body has slots on both sides near the top.

2. The fuel cell bipolar plate sealing structure according to claim 1, characterized in that: A first rubber pad is provided at the top of the mounting groove of the substrate, corresponding to the slot, and a second rubber pad is provided at the top of the mounting groove of the side plate, corresponding to the slot. The width of the outer wall of the first rubber pad and the second rubber pad is adapted to the width of the inner wall of the slot.

3. The fuel cell bipolar plate sealing structure according to claim 1, characterized in that: The sealing strip is U-shaped and is bonded and fixed to the substrate. The width of the outer wall of the sealing strip is adapted to the width of the inner wall of the sealing groove.

4. The fuel cell bipolar plate sealing structure according to claim 1, characterized in that: The substrate has four insertion posts near the four corners on its front end surface, and each insertion post has a first screw hole at its top.

5. The fuel cell bipolar plate sealing structure according to claim 1, characterized in that: Each side plate has a insertion hole corresponding to the insertion post, and a countersunk hole is provided on the front end face of the side plate corresponding to the insertion hole. Each countersunk hole is provided with a flat-head screw, and the end of the flat-head screw passes through the countersunk hole and is threadedly connected to the first screw hole.

6. The fuel cell bipolar plate sealing structure according to claim 1, characterized in that: The positioning block and one of the base plates are integrally formed. The width of the outer wall of the positioning block is adapted to the width of the inner wall of the positioning groove. The fixing bolt passes through the through hole and extends from the positioning groove to the second screw hole for threaded connection.

7. The fuel cell bipolar plate sealing structure according to claim 1, characterized in that: The width of the outer wall of the electrode plate body is adapted to the width of the inner wall of the mounting groove between the substrate and the side plate.

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