CN220341262U - Exhaust structure for single cell glue injection process - Google Patents

Abstract

The utility model relates to an exhaust structure for a single cell glue injection process, wherein a single cell comprises a single cell body, and the single cell body comprises an anode plate, a membrane electrode and a cathode plate which are sequentially stacked together; the single cell body is provided with a plurality of glue injection inlet channels, and sealing glue is injected into a cavity formed by the anode plate and the membrane electrode and a cavity formed by the cathode plate and the membrane electrode through the glue injection inlet channels to form a sealing structure; the exhaust structure includes: at least one first exhaust hole arranged on at least one of the anode plate and the cathode plate, and a second exhaust hole which is arranged on the membrane electrode and corresponds to the first exhaust hole; the first exhaust hole is positioned at one side of the cavity and is communicated with the cavity at the corresponding position through the second exhaust hole. In the glue injection process, the gas in each cavity can be removed, so cavitation is not generated.

Description

Exhaust structure for single cell glue injection process

Technical field

The utility model relates to the technical field of single cell glue injection process, and specifically relates to an exhaust structure used in the single cell glue injection process.

Background technique

A fuel cell is a chemical device that converts the chemical energy of fuel into electrical energy. It is the fourth power generation technology after hydropower, thermal power and atomic power. Because fuel cells convert the chemical energy of fuel into electrical energy through electrochemical reactions and are not subject to the Carnot cycle effect, they are extremely efficient.

The single cell in the fuel cell structural unit is mainly composed of a membrane electrode assembly, a cathode plate and an anode plate. The membrane electrode assembly is composed of a proton exchange membrane, a catalyst and a gas diffusion layer, and is the place where chemical reactions occur; cathode plates and anode plates It is a metal plate with flow channels. Its main function is to transport reaction gases, collect and conduct current, and discharge water and heat generated by the reaction.

However, in the process of single cell sealing and glue injection, the flowing sealing glue is diverted forward due to various obstacles in the plastic part structure or mold design, and meets at a certain position, causing the gas to be trapped in the mold cavity. If it is not Eliminate it in time, or the gas continues to be generated, causing the trapped gas area to be unable to be filled, and air pockets will appear. Therefore, during the production and manufacturing process, it is necessary to consider how to ensure that the sealant flows evenly in each cavity of the single cell without generating gas. hole problem.

For example, patent document CN112701315A discloses a sealing structure and sealing method for a non-welded metal plate single cell, which proposes a single cell solution that forms a sealing ring through integral glue injection. This method uses glue injection instead of welding, which improves production efficiency. However, the design of this method did not consider the design of glue injection vents on the electrode plates. This may cause excessive local pressure in the glue injection area after a certain period of time when bubbles appear during the glue injection process, exceeding the upper limit of the glue injection pressure. phenomenon, resulting in local failure to successfully inject glue, thus affecting the sealing of the single cell.

To sum up, the existing single cells using the glue injection process mainly have the following problems:

1. Cavitation is prone to occur during the injection of sealant into single cells, and the sealing effect of single cells cannot be guaranteed;

2. Failure to exhaust air in time during the process of injecting sealant into single cells will cause higher pressure in the entire injection process, longer process filling time, higher required clamping force, and higher equipment and process costs;

3. During the process of injecting sealant into single cells, the gas cannot be eliminated in time to generate bubbles, which will lead to insufficient mechanical strength of the injection-molded sealant strip.

Therefore, it is necessary to develop an exhaust structure for the single cell glue injection process.

Utility model content

The purpose of this utility model is to provide an exhaust structure used in the glue injection process of a single cell. During the glue injection process, the gas in each chamber can be eliminated to avoid cavitation.

The utility model describes an exhaust structure for a single cell glue injection process, wherein the single cell includes a single cell body, and the single cell body includes an anode plate, a membrane electrode and a cathode plate that are stacked together in sequence; A plurality of glue injection inlet channels are provided on the single cell body, and sealant is injected into the chamber formed by the anode plate and the membrane electrode, and the chamber formed by the cathode plate and the membrane electrode through the glue injection inlet channel to form a sealing structure; Gas structures include:

At least one first exhaust hole provided on at least one of the anode plate and the cathode plate, and a second exhaust hole opened on the membrane electrode and corresponding to the first exhaust hole;

The first exhaust hole is located on one side of the chamber, and the first exhaust hole is connected with the chamber at a corresponding position through the second exhaust hole.

Optionally, a first exhaust hole is provided between any two adjacent glue injection inlet channels to provide a way for air to be discharged during the glue injection process.

Optionally, the chamber formed by the anode plate and the membrane electrode and the chamber formed by the cathode plate and the membrane electrode are arranged in a vertical alignment; this facilitates glue injection.

Optionally, the anode plate is provided with a sealing groove that protrudes in a direction away from the membrane electrode; the anode plate and the membrane electrode form the chamber through the sealing groove on the anode plate; by providing the sealing groove, the number of the anode plate and the membrane electrode can be increased The contact area of the glue improves the sealing and rigidity of the single cell.

Optionally, the cathode plate is provided with a sealing groove that protrudes in a direction away from the membrane electrode; the cathode plate and the membrane electrode form the chamber through the sealing groove on the cathode plate; by providing the sealing groove, the distance between the cathode plate and the membrane electrode can be increased The contact area of the glue improves the sealing and rigidity of the single cell.

Optionally, the glue injection inlet channel includes:

The first hole opened on the cathode plate;

a second hole opened on the membrane electrode;

and a third hole opened on the anode plate;

The first hole, the second hole and the third hole are arranged in an upward and downward alignment, which facilitates glue injection and ensures that the sealing structure is an integrated structure.

Optionally, the glue injection inlet channel includes:

The first hole opened on the cathode plate;

And a second hole opened on the membrane electrode;

The first hole and the second hole are aligned up and down, which facilitates glue injection and ensures that the sealing structure is an integrated structure.

Optionally, the glue injection inlet channel includes:

a second hole opened on the membrane electrode;

and a third hole opened on the anode plate;

The second hole and the third hole are aligned up and down, which facilitates glue injection and ensures that the sealing structure is an integrated structure.

Optionally, one end of the second exhaust hole extends into the chamber, and the other end of the second exhaust hole extends below the first exhaust hole; this facilitates the exhaustion of all gas in each chamber. .

Optionally, the first exhaust hole is opened on the cathode plate to facilitate gas removal.

Beneficial effects of this utility model:

1. The traditional glue injection process uses upper and lower exhaust. The upper and lower exhaust will cause glue overflow. Post-processing of the glue after passing through the exhaust port area will affect the yield rate of the single cell. The utility model arranges the exhaust structure on the side, exhausts air through the side, and cuts off the excess rubber strip after the sealing strip is formed, which will not affect the battery sealing effect, has low process cost and high realizability.

2. The exhaust structure of the utility model (including the first exhaust hole and the second exhaust hole) is conducive to the communication of each chamber. When the glue injection starts, the three-layer chamber (including the chamber between the anode plate and the membrane electrode , the cavity between the cathode plate and the membrane electrode, and the cavity between the cathode plate and the injection mold) are filled with glue at the same time. The gas in the three cavities is gathered together by the second exhaust hole on the membrane electrode and passes through the third cavity at the same time. One exhaust hole is eliminated, so cavitation will not occur, which greatly improves the injection quality and mechanical strength of the entire sealant strip.

Description of the drawings

Figure 1 is a partial cross-sectional view of the exhaust structure in this embodiment;

Figure 2 is one of the partial cross-sectional views of the glue injection inlet channel in this embodiment (without glue injection);

Figure 3 is the second partial cross-sectional view of the glue injection inlet channel in this embodiment (without glue injection);

Figure 4 is the third partial cross-sectional view of the glue injection inlet channel in this embodiment (without glue injection);

Figure 5 is a schematic diagram of Figure 2 after glue injection;

Figure 6 is a schematic structural diagram of the single cell body in this embodiment;

In the picture: 1. Cathode plate, 2. Membrane electrode, 3. Anode plate, 4. First exhaust hole, 5. Second exhaust hole, 6. Sealing groove, 7. Chamber, 8. Single cell body, 9. The first hole, 10. The second hole, 11. The third hole, 12. Sealing structure;

The arrows in Figure 1 indicate the direction of gas removal.

Detailed ways

The implementation of the technical solution of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations. Various details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and are not intended to limit the protection scope of the present invention.

As shown in Figures 1 to 6, in this embodiment, an exhaust structure is used for a single cell glue injection process, in which the single cell includes a single cell body 8, and the single cell body 8 includes two parts stacked together in sequence. The anode plate 3, the membrane electrode 2 and the cathode plate 1; the single cell body 8 is provided with a plurality of glue injection inlet channels, and the sealant is injected into the chamber formed by the anode plate 3 and the membrane electrode 2 through the glue injection inlet channels. 7. A sealing structure 12 is formed in the cavity 7 formed by the cathode plate 1 and the membrane electrode 2 (during the glue injection process, the cavity between the cathode plate 1 and the glue injection mold is injected with glue at the same time as the two chambers 7, That is, an integrated sealing structure including a water chamber sealing ring, a cathode surface sealing ring, an anode surface sealing ring and multiple sealing connection structures is formed). The exhaust structure includes: provided on at least one of the anode plate 3 and the cathode plate 1 (including the first exhaust hole 4 being provided only on the anode plate 3, or the first exhaust hole 4 being provided only on the cathode plate 1, or the first exhaust hole 4 being provided only on the cathode plate 1, or An exhaust hole 4 is provided on both the anode plate 3 and the cathode plate 1 (in these three cases) at least one first exhaust hole 4 is provided on the membrane electrode 2 and corresponds to the first exhaust hole. Exhaust hole 5; the first exhaust hole is located on one side of the chamber 7, and the first exhaust hole is connected with the chamber 7 at the corresponding position through the second exhaust hole 5.

As shown in Figure 1, in this embodiment, the first exhaust hole 4 is arranged on the side to exhaust air through the side. This exhaust structure (including the first exhaust hole 4 and the second exhaust hole 5) is beneficial to each The chambers are connected. When the glue injection starts, the three chambers (including the chamber between the anode plate and the membrane electrode, the chamber between the cathode plate and the membrane electrode, and the chamber between the cathode plate and the injection mold) are processed simultaneously. Glue, the three-cavity gases are gathered together by the membrane electrode outlet channel and eliminated simultaneously, so cavitation will not occur, which greatly improves the glue injection quality and mechanical strength of the entire sealing strip. In addition, since the first exhaust hole 4 is provided on the side, the excess rubber strip can be cut off after the sealing strip is formed, which will not affect the battery sealing effect, and the process cost is low and the realizability is high.

In this embodiment, a first exhaust hole 4 is provided between any two adjacent glue injection inlet channels to provide a way for air to be discharged during the glue injection process.

As shown in Figures 1 to 5, in this embodiment, the chamber 7 formed by the anode plate 3 and the membrane electrode 2 and the chamber 7 formed by the cathode plate and the membrane electrode 2 are aligned up and down; it is convenient for glue injection. .

As shown in Figures 1 to 5, in this embodiment, the anode plate 3 is provided with a sealing groove 6 protruding in a direction away from the membrane electrode 2; the anode plate 3 communicates with the membrane electrode through the sealing groove 6 on the anode plate 3. 2 to form the chamber 7; by setting the sealing groove 6, the contact area between the anode plate 3 and the glue can be increased, thereby improving the sealing performance and rigidity of the single cell.

As shown in Figures 1 to 5, in this embodiment, the cathode plate 1 is provided with a sealing groove 6 protruding in a direction away from the membrane electrode 2; the cathode plate 1 communicates with the membrane electrode through the sealing groove 6 on the cathode plate 1 2 to form the chamber 7; by setting the sealing groove 6, the contact area between the cathode plate 1 and the glue can be increased, thereby improving the sealing performance and rigidity of the single cell.

As shown in Figures 2 and 5, in one example, the glue injection inlet channel includes a first hole 9 opened on the cathode plate 1; a second hole 10 opened on the membrane electrode 2; and a first hole 9 opened on the anode plate 3 The third hole 11 on the top; the first hole 9, the second hole 10 and the third hole 11 are aligned up and down; it is convenient for glue injection and can ensure that the sealing structure is an integrated structure.

As shown in Figure 4, in one example, the glue injection inlet channel includes a first hole 9 opened on the cathode plate 3; and a second hole 10 opened on the membrane electrode 2; the first hole 9 and the second hole 10 are opened on the membrane electrode 2; The two holes 10 are aligned up and down, which facilitates glue injection and ensures that the sealing structure is an integrated structure.

As shown in Figure 3, in one example, the glue injection inlet channel includes a second hole 10 opened on the membrane electrode 2; and a third hole 11 opened on the anode plate 3; the second hole 10 and the third hole 11 are opened on the anode plate 3; The three holes 11 are aligned up and down, which facilitates glue injection and ensures that the sealing structure is an integrated structure.

As shown in FIG. 1 , in this embodiment, one end of the second exhaust hole 5 extends into the chamber, and the other end of the second exhaust hole 5 extends below the first exhaust hole 4 ; Ensure the connectivity of each chamber so that gas can be smoothly discharged out of the single cell.

As shown in Figure 1, in this embodiment, the first exhaust hole 4 is opened on the cathode plate 1 to facilitate gas removal.

The above-mentioned embodiments are preferred embodiments of the present utility model, but the implementation of the present utility model is not limited by the above-mentioned embodiments. Any other changes, modifications, modifications, etc. may be made without departing from the spirit and principle of the present utility model. Substitution, combination, and simplification should all be equivalent replacement methods, and are all included in the protection scope of the present utility model.

Claims (10)

1. An exhaust structure for a single cell glue injection process, wherein a single cell comprises a single cell body (8), and the single cell body (8) comprises an anode plate (3), a membrane electrode (2) and a cathode plate (1) which are sequentially stacked together; a plurality of glue injection inlet channels are formed in the single cell body (8), and sealing glue is injected into a cavity (7) formed by the anode plate (3) and the membrane electrode (2) and a cavity (7) formed by the cathode plate and the membrane electrode (2) through the glue injection inlet channels to form a sealing structure (12); the exhaust structure is characterized by comprising:

at least one first exhaust hole (4) arranged on at least one of the anode plate (3) and the cathode plate (1), and a second exhaust hole (5) which is arranged on the membrane electrode (2) and corresponds to the first exhaust hole (4);

the first exhaust hole (4) is positioned at one side of the cavity (7), and the first exhaust hole (4) is communicated with the cavity (7) at the corresponding position through the second exhaust hole (5).

2. The exhaust structure for a cell glue injection process according to claim 1, wherein: a first exhaust hole (4) is arranged between any two adjacent glue injection inlet channels.

3. The exhaust structure for a cell glue injection process according to claim 1, wherein: the cavity (7) formed by the anode plate (3) and the membrane electrode (2) is aligned with the cavity (7) formed by the cathode plate and the membrane electrode (2) up and down.

4. A vent structure for a cell glue injection process according to claim 3, wherein: a sealing groove (6) protruding towards the direction far away from the membrane electrode (2) is arranged on the anode plate (3); the anode plate (3) and the membrane electrode (2) form the cavity (7) through a sealing groove (6) on the anode plate.

5. The exhaust structure for a cell glue injection process according to claim 4, wherein: a sealing groove (6) protruding towards the direction far away from the membrane electrode (2) is arranged on the cathode plate (1); the cathode plate (1) and the membrane electrode (2) form the cavity (7) through a sealing groove (6) on the cathode plate.

6. The exhaust structure for a cell glue injection process according to claim 5, wherein: the glue injection inlet passage includes:

a first hole (9) formed in the cathode plate (1);

a second hole (10) formed in the membrane electrode (2);

and a third hole (11) formed in the anode plate (3);

the first hole (9), the second hole (10) and the third hole (11) are arranged in an up-down alignment mode.

7. The exhaust structure for a cell glue injection process according to claim 5, wherein: the glue injection inlet passage includes:

a first hole (9) formed in the cathode plate (1);

and a second hole (10) provided in the membrane electrode (2);

the first hole (9) and the second hole (10) are arranged in an up-down alignment.

8. The exhaust structure for a cell glue injection process according to claim 5, wherein: the glue injection inlet passage includes:

a second hole (10) formed in the membrane electrode (2);

and a third hole (11) formed in the anode plate (3);

the second hole (10) and the third hole (11) are arranged in an up-down alignment.

9. The exhaust structure for a cell glue injection process according to claim 5, wherein: one end of the second exhaust hole (5) extends into the cavity (7), and the other end of the second exhaust hole (5) extends to the lower part of the first exhaust hole (4).

10. The exhaust structure for a cell glue injection process according to claim 1, wherein: the first exhaust hole (4) is formed in the cathode plate (1).