Battery

Abstract

The utility model discloses a battery which comprises a bipolar plate and a membrane electrode assembly, a sealing washer is arranged between the bipolar plate and the membrane electrode assembly, a plurality of glue injection holes are formed in the sealing washer, and glue is injected into the glue injection holes, so that the sealing washer is integrally connected with the bipolar plate and the membrane electrode assembly. The battery provided by the utility model effectively solves the problems of displacement of the sealing gasket and poor sealing effect in the sealing method of the battery in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery. Background Art

[0002] Proton exchange membrane fuel cell is a clean energy conversion device with many advantages such as cleanliness and pollution-free, high energy conversion efficiency, fast start-up at low temperature, high specific power and specific energy. Therefore, it can be used as one of the ideal candidate power sources for electric vehicles.

[0003] Proton exchange membrane fuel cells are mainly composed of multiple single cells connected in series. Each single cell is mainly composed of a membrane electrode, a sealing material and a bipolar plate. The sealing material is located between the membrane electrode and the bipolar plate to prevent leakage of reaction gases and liquids inside the cell. The quality of the bonding performance between the sealing material and the bipolar plate significantly affects the stability and life of the single cell.

[0004] Existing sealing structures typically use silicone rubber, fluororubber, or polyolefin rubber as the sealing material. A sealing gasket is molded into the desired shape and then assembled onto the bipolar plate, achieving a seal using the assembly pressure between the cells. Traditional sealing methods commonly suffer from gasket displacement, which compromises the sealing effect. This problem is primarily due to the relatively low surface energy of commonly used sealing materials. Without special treatment, it is generally difficult to achieve a high bond strength with the bipolar plate.

[0005] Currently, one technology involves providing multiple slots within the bipolar plate sealing groove and / or on the frame of the membrane electrode assembly (MEA). Glue is injected into the slots to form an integrated connection with the sealing gaskets located within the bipolar plate sealing groove and / or on the upper, lower, or both sides of the MEA frame. This method can effectively and reliably reduce the problem of gasket displacement. However, providing multiple slots within the bipolar plate sealing groove and / or on the MEA frame significantly increases the difficulty of manufacturing the bipolar plate / MEA frame. Furthermore, the slots on the bipolar plate are difficult to precisely control, increasing the likelihood of uneven force on the bipolar plate, resulting in lower usability.

[0006] In summary, the battery sealing method in the prior art has the problems of displacement of the sealing gasket and poor sealing effect. Utility Model Content

[0007] The present invention provides a battery in an embodiment to solve the problems of displacement of sealing gaskets and poor sealing effect in the prior art battery sealing method.

[0008] To achieve the above-mentioned purpose, the present invention provides a battery, comprising a bipolar plate and a membrane electrode assembly, wherein a sealing gasket is arranged between the bipolar plate and the membrane electrode assembly, and a plurality of glue injection holes are provided on the sealing gasket, and glue is injected into the glue injection holes to integrally connect the sealing gasket with the bipolar plate and the membrane electrode assembly.

[0009] Furthermore, the hardness of the sealing gasket ranges from 25HA to 50HA, which is Shore A hardness.

[0010] Furthermore, the hardness of the sealing gasket is 40HA.

[0011] Furthermore, the number of the bipolar plates is two, the membrane electrode assembly is located between the two bipolar plates, and the sealing gasket is provided between the membrane electrode assembly and each of the bipolar plates.

[0012] Furthermore, the glue injection hole is provided on the side of the sealing gasket facing the bipolar plate, and the glue injection hole is a blind hole.

[0013] Furthermore, the glue injection hole is a through hole, and the glue injected in the glue injection hole connects the bipolar plate and the sealing gasket.

[0014] Furthermore, the glue injection holes are evenly arranged on the sealing gasket.

[0015] Furthermore, the number of the glue injection holes is an even number, and all the glue injection holes are symmetrically arranged along the center of the sealing gasket.

[0016] Furthermore, the sealing gasket is a polygonal gasket structure, and the glue injection holes are provided at the corners of the polygon.

[0017] Furthermore, the battery is a proton exchange membrane fuel cell.

[0018] The utility model uses a sealing gasket for sealing. A glue injection hole is directly opened in the sealing gasket, and adhesive is directly injected into the injection hole using a glue injection machine. This allows the sealing gasket and bipolar plate to be solidified into one piece and not shift under external forces. This effectively ensures the seal between the bipolar plate and the membrane electrode assembly, prevents gas leakage or cross-talk between the cathode and anode, and effectively improves the safety of the fuel cell. By opening a glue injection hole in the sealing gasket and using adhesive injection to integrally connect the bipolar plate, membrane electrode assembly, and sealing gasket, a good sealing effect is achieved between the bipolar plate and membrane electrode assembly, effectively avoiding the problem of sealing gasket displacement, improving the bonding strength, and enhancing the sealing effect of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a battery according to an embodiment of the present utility model;

[0020] Figure 2 It is a structural schematic diagram of a sealing gasket of a battery according to an embodiment of the present utility model. DETAILED DESCRIPTION

[0021] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments, but this does not limit the present invention.

[0022] See also Figure 1 and Figure 2 As shown, according to an embodiment of the present invention, a battery is provided, which includes a bipolar plate 1 and a membrane electrode assembly 2, a sealing gasket 3 is arranged between the bipolar plate 1 and the membrane electrode assembly 2, and a plurality of glue injection holes 4 are provided on the sealing gasket 3. Glue is injected into the glue injection holes 4 to integrate the sealing gasket 3 with the bipolar plate 1 and the membrane electrode assembly 2.

[0023] The utility model uses a sealing gasket for sealing. A glue injection hole is directly opened in the sealing gasket, and adhesive is directly injected into the injection hole using a glue injection machine. This allows the sealing gasket and bipolar plate to be solidified into one piece and not shift under external forces. This effectively ensures the seal between the bipolar plate and the membrane electrode assembly, prevents gas leakage or cross-talk between the cathode and anode, and effectively improves the safety of the fuel cell. By opening a glue injection hole in the sealing gasket and using adhesive injection to integrally connect the bipolar plate, membrane electrode assembly, and sealing gasket, a good sealing effect is achieved between the bipolar plate and membrane electrode assembly, effectively avoiding the problem of sealing gasket displacement, improving the bonding strength, and enhancing the sealing effect of the battery.

[0024] Preferably, the hardness of the sealing gasket 3 is in the range of 25HA to 50HA, which is Shore A. The hardness requirement of the sealing gasket is to ensure that the sealing gasket can withstand a certain compressive stress when the upper and lower bipolar plates are pressed together for assembly.

[0025] In this embodiment, the most preferred embodiment is that the hardness of the sealing gasket 3 is 40HA. When the hardness of the sealing gasket is the above value, it can ensure that it can withstand the compressive stress and also have a certain degree of elasticity and softness.

[0026] There are two bipolar plates 1 , the membrane electrode assembly 2 is located between the two bipolar plates 1 , and a sealing gasket 3 is provided between the membrane electrode assembly 2 and each bipolar plate 1 .

[0027] The two sealing gaskets are symmetrically arranged up and down, and the sealing gaskets can integrate the bipolar plate and the membrane electrode assembly to achieve a better sealing effect.

[0028] In this embodiment, the glue injection hole 4 is a through hole, and the glue injected in the glue injection hole 4 connects the bipolar plate 1 and the sealing gasket 3 .

[0029] The adhesive can be a single / two-component room temperature curing silicone, synthetic rubber, etc., which can be directly injected and molded by a CNC injection machine, and the sealing gasket is integrally connected to the bipolar plate through the injection hole.

[0030] The injection holes 4 are evenly arranged on the sealing gasket 3. The number of the injection holes 4 is preferably 2-20, and they are evenly distributed on the sealing gasket. The evenly arranged injection holes are conducive to improving the sealing effect and increasing the overall safety.

[0031] Preferably, the number of the glue injection holes 4 is an even number, and all the glue injection holes 4 are symmetrically arranged along the center of the sealing gasket 3. The number of glue injection holes 4 can be 8, 12, or 16, and they are located in equal numbers at the upper and lower corners of the sealing gasket. The symmetrical arrangement of the glue injection holes can prevent the sealing gasket from shifting, which helps to improve the overall sealing performance.

[0032] The sealing gasket 3 is a polygonal gasket structure, with the glue injection holes 4 provided at the corners of the polygon. In this embodiment, the sealing gasket is a rectangular gasket, and preferably has four glue injection holes, located at the four corners of the sealing gasket. This allows for more uniform and symmetrical glue injection and connection, improving the sealing effect.

[0033] In this embodiment, the battery is a proton exchange membrane fuel cell. This embodiment provides a simple and efficient proton exchange membrane fuel cell, and the sealing structure of the battery can effectively avoid the problem of sealing gasket displacement and improve the sealing effect of the proton exchange membrane fuel cell.

[0034] The glue injection hole should be neither too small nor too large. If it is too small, adhesive can easily overflow from the gasket when it is compressed, blocking the fuel cell's internal flow path. If it is too large, it can easily cause the gasket to rupture during long-term operation. Therefore, the gasket dimensions are 10mm-15mm long and 1mm-3mm wide, preferably 10mm long and 2mm wide. When the glue injection hole is located within the sealing groove, it is preferably a through-hole, allowing the glue injection to penetrate the bipolar plate and form an integrated connection with the two sealing gaskets on either side.

[0035] The material of the adhesive injected into the glue injection hole is similar to that of the sealing gasket. The adhesive is room temperature curing, heat curing or UV curing adhesive, and is preferably room temperature curing organic silicone.

[0036] The injection holes in the sealing gasket can also have other shapes, such as semicircular, elliptical, square, or arched. The injection holes can also vary in size, depending on actual production needs. The thickness of the sealing gasket 1 needs to match the pre-defined flow channels on the bipolar plates, preferably 0.8 mm, to ensure a tight fit between the bipolar plates and ensure overall sealing.

[0037] The present utility model also provides another embodiment, the battery structure of this embodiment is basically the same as the battery of the above embodiment, the only difference is the specific structure of the glue injection hole. In this embodiment, the glue injection hole 4 is provided on the side of the sealing gasket 3 facing the bipolar plate 1, and the glue injection hole 4 is a blind hole.

[0038] When the glue injection hole is in a non-sealing groove position, a blind hole is preferably used. One end of the glue injection hole is connected to the sealing groove, and the glue injection extends from the groove hole to the sealing gasket in the sealing groove, so that the sealing gasket is integrated with the bipolar plate.

[0039] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0040] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0041] Of course, the above are preferred embodiments of the present invention. It should be noted that, for those skilled in the art, without departing from the basic principles of the present invention, several improvements and modifications can be made, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A battery comprising a bipolar plate (1) and a membrane electrode assembly (2), characterized in that: A sealing gasket (3) is provided between the bipolar plate (1) and the membrane electrode assembly (2), and a plurality of glue injection holes (4) are provided on the sealing gasket (3). Glue is injected into the glue injection holes (4) so ​​that the sealing gasket (3) is integrally connected to the bipolar plate (1) and the membrane electrode assembly (2).

2. The battery according to claim 1, characterized in that The hardness of the sealing gasket (3) ranges from 25HA to 50HA, which is Shore A hardness.

3. The battery according to claim 2, characterized in that The hardness of the sealing gasket (3) is 40HA.

4. The battery according to claim 1, characterized in that The number of the bipolar plates (1) is two, the membrane electrode assembly (2) is located between the two bipolar plates (1), and the sealing gasket (3) is provided between the membrane electrode assembly (2) and each bipolar plate (1).

5. The battery according to claim 4, characterized in that The sealing gasket (3) is provided with the glue injection hole (4) on the side facing the bipolar plate (1), and the glue injection hole (4) is a blind hole.

6. The battery according to claim 4, characterized in that The glue injection hole (4) is a through hole, and the glue injected in the glue injection hole (4) connects the bipolar plate (1) and the sealing gasket (3).

7. The battery according to claim 1, characterized in that The glue injection holes (4) are evenly arranged on the sealing gasket (3).

8. The battery according to claim 7, characterized in that The number of the glue injection holes (4) is an even number, and all the glue injection holes (4) are symmetrically arranged along the center of the sealing gasket (3).

9. The battery according to claim 1, characterized in that The sealing gasket (3) is a polygonal gasket structure, and the glue injection holes (4) are provided at the corners of the polygon.

10. The battery according to claim 1, characterized in that The battery is a proton exchange membrane fuel cell.

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