阅读说明：本技术 一种氢燃料电池石墨板的点胶方法 (Dispensing method of graphite plate of hydrogen fuel cell ) 是由 吴威元 蔡奇志 于 2019-10-01 设计创作，主要内容包括：本发明属于氢燃料电池技术领域,尤其涉及一种氢燃料电池石墨板的点胶方法。其包括石墨板的制作、点胶前的吸附固定、点胶过程设定、自动化点胶、烘烤、防胶条变形以及点胶后的气密性检测等操作步骤,氢光板及石墨板在点胶过程中,均采用吸附的固定方式,解决了石墨材料容易碎裂的问题。并且,本发明的点胶密封方式,相对于现有的注胶的方式,密封性较好,相比于设置密封圈的方式,自动化程度高,有利于大批量的生产,提高了生产效率。(The invention belongs to the technical field of hydrogen fuel cells, and particularly relates to a dispensing method for a graphite plate of a hydrogen fuel cell. The method comprises the operation steps of manufacturing a graphite plate, adsorbing and fixing before dispensing, dispensing process setting, automatic dispensing, baking, preventing deformation of an adhesive tape, detecting air tightness after dispensing and the like. Compared with the existing glue injection mode, the glue dispensing sealing mode has the advantages that the sealing performance is better, the automation degree is high, the mass production is facilitated, and the production efficiency is improved.)

1. A dispensing method for a graphite plate of a hydrogen fuel cell is characterized by at least comprising the following steps:

s1, engraving by using an engraving machine to manufacture a hydrogen plate and an air plate;

s2, placing the hydrogen light plate on an adsorption jig, starting the adsorption jig and adsorbing the hydrogen light plate, then moving the adsorption jig and the hydrogen light plate on the adsorption jig to the lower part of the automatic dispenser, and starting the automatic dispenser to dispense the hydrogen light plate according to a sealing track;

s3, providing a tooling jig which comprises a trough and a pressing plate capable of being in threaded connection with the top of the trough, placing an air plate into the trough, attaching the air plate to the glued hydrogen optical plate, and repeatedly attaching and stacking the air plate and the hydrogen optical plate according to the number of required graphite plates to obtain a graphite plate;

s4, placing a pressing plate on the graphite plate, pressing the graphite plate tightly, locking the graphite plate by screws, and placing the graphite plate into an oven for baking;

s5, placing the graphite plate on an adsorption jig, enabling the A surface of the graphite plate to face upwards, starting the adsorption jig to adsorb the graphite plate, then moving the adsorption jig and the graphite plate on the adsorption jig to the lower side of an automatic dispenser, and starting the automatic dispenser to dispense glue on the A surface of the graphite plate according to a sealing track;

s6, putting the graphite plate into an oven for baking; before baking, the graphite plate is supported by a supporting piece, so that the rubber strip is not extruded, and the original shape is kept;

s7, placing the graphite plate on the adsorption jig again, enabling the B surface of the graphite plate to face upwards, sucking the graphite plate by using the adsorption jig, moving the adsorption jig and the graphite plate on the adsorption jig to the position below the automatic dispenser, and starting the automatic dispenser to dispense glue on the B surface of the graphite plate according to a sealing track;

s8, putting the graphite plate into an oven for baking; before baking, the graphite plate is supported by a supporting piece, so that the rubber strip is not extruded, and the original shape is kept;

and S9, detecting the tightness, and measuring the tightness of the three circuits, namely the oxygen channel, the hydrogen channel and the cooling channel under 100KP α.

2. The dispensing method of graphite plates for hydrogen fuel cells according to claim 1, wherein the adsorption jig comprises a working platform, at least one adsorption device for generating suction force by using venturi effect, and a plurality of support strips, the adsorption device and the support strips are mounted on the working platform, and the suction force direction of the adsorption device is vertically downward; the plurality of bearing strips are arranged around the adsorption device.

3. The method for dispensing the graphite plate for the hydrogen fuel cell according to claim 2, wherein the plurality of supporting strips are arranged in a rectangular shape, and the top surfaces of the plurality of supporting strips are flush with the top surface of the adsorption device; at least one of the two opposite bearing strips is detachably arranged on the working platform, and the materials with different sizes are met by adjusting the distance between the two opposite bearing strips.

4. The method for dispensing the graphite plate of the hydrogen fuel cell according to claim 3, wherein at least one of the two opposite support strips is fixed on the working platform by screws or magnetic attraction.

5. The dispensing method of graphite plates for hydrogen fuel cells according to any one of claims 2 to 4, wherein the adsorption jig further comprises a moving module, the working platform is mounted on the moving module, and the moving module can drive the working platform to reciprocate in a linear direction.

6. The dispensing method of graphite plates for hydrogen fuel cells according to claim 1, wherein the automatic dispenser uses a high precision screw valve for dispensing and a precision needle.

7. The method for dispensing glue on graphite plates of hydrogen fuel cells according to claim 1, wherein the glue used for dispensing is polyisobutylene, the storage temperature is-5 ℃ to +10 ℃, the direct irradiation of sunlight is avoided, sealing is needed before and after use, and the glue can be applied after being unfrozen to normal temperature before being taken out.

8. The dispensing method of graphite plates for hydrogen fuel cells according to claim 1, wherein the baking time in the oven is 90 minutes and the temperature is 130 ° in the steps S3, S5 and S7.

9. The method for dispensing graphite plates for hydrogen fuel cells according to claim 1, wherein the steps S1, S4 and S6 further include dispensing path setting, height setting and speed setting; the dispensing path is divided into a starting point-straight line 1-straight line 2-straight line 3-straight line 4, and a position is set on a long straight line; wherein, the length from the starting point to the straight line 1 is set to be 5mm, the length from the straight line 1 to the straight line 2 is set to be 8mm, the length from the straight line 2 to the straight line 3 is set to be 8mm, and the length from the straight line 3 to the straight line 4 is set to be 8 mm; the height of the starting point is set to be 0.2mm from the needle to the bottom surface of the graphite plate groove, and the dispensing height of the straight line 1 is set to be 0.8mm from the needle to the bottom surface of the groove; and respectively writing the glue dispensing speed in each interval from the starting point to the straight line 4, dispensing at an increasing speed, and determining the size of the adhesive tape by controlling the glue dispensing speed.

10. The method for dispensing graphite plates for hydrogen fuel cells according to claim 9, wherein the steps S1, S4, S6 further include ending the dispensing setting, the line of line 2 from the last being coincident with the start point coordinate setting at the same point, the line of line 1 from the last being 20mm in length with the line of line 2 from the last, and the distance for closing the dispensing in advance being 20 mm.

Technical Field

The invention belongs to the technical field of hydrogen fuel cells, and particularly relates to a dispensing method for a graphite plate of a hydrogen fuel cell.

Background

The fuel cell is a new power supply with development prospect, and generally takes hydrogen, carbon, methanol, borohydride, coal gas or natural gas as fuel, as a cathode, and takes oxygen in the air as an anode. It is mainly different from a general battery in that an active material of the general battery is previously put inside the battery, and thus the battery capacity depends on the amount of the active material stored; the active materials (fuel and oxidant) of the fuel cell are continuously supplied while reacting, and therefore, such a cell is actually only an energy conversion device. The battery has the advantages of high conversion efficiency, large capacity, high specific energy, wide power range, no need of charging and the like.

The electrode plate of the fuel cell is an electrochemical reaction site where the fuel undergoes an oxidation reaction and the oxidant undergoes a reduction reaction, and the key to the performance of the electrode plate is the performance of the catalyst, the material of the electrode, the manufacturing process of the electrode, and the like.

The region of the electrode plate near the center is usually a reaction region, and mainly includes a flow field for flowing and reacting air, hydrogen and coolant, and an inlet and an outlet for each fluid to enter and exit the flow field. Because of the need to maintain the tightness of the reaction region, grooves are usually formed in both the anode plate and the cathode plate to surround the reaction region.

Disclosure of Invention

The invention aims to solve the technical problem of providing a dispensing method of a graphite plate of a hydrogen fuel cell, and aims to solve the problems of poor sealing performance or inconvenience in realizing automatic production in a sealing mode of an electrode plate in the prior art.

The invention is realized in this way, a dispensing method of graphite plates of hydrogen fuel cells, which at least comprises the following steps:

s1, engraving by using an engraving machine to manufacture a hydrogen plate and an air plate;

s2, placing the hydrogen light plate on an adsorption jig, starting the adsorption jig and adsorbing the hydrogen light plate, then moving the adsorption jig and the hydrogen light plate on the adsorption jig to the lower part of the automatic dispenser, and starting the automatic dispenser to dispense the hydrogen light plate according to a sealing track;

s3, providing a tooling jig which comprises a trough and a pressing plate capable of being in threaded connection with the top of the trough, placing an air plate into the trough, attaching the air plate to the glued hydrogen optical plate, and repeatedly attaching and stacking the air plate and the hydrogen optical plate according to the number of required graphite plates to obtain a graphite plate;

s4, placing a pressing plate on the graphite plate, pressing the graphite plate tightly, locking the graphite plate by screws, and placing the graphite plate into an oven for baking;

s5, placing the graphite plate on an adsorption jig, enabling the A surface of the graphite plate to face upwards, starting the adsorption jig to adsorb the graphite plate, then moving the adsorption jig and the graphite plate on the adsorption jig to the lower side of an automatic dispenser, and starting the automatic dispenser to dispense glue on the A surface of the graphite plate according to a sealing track;

s6, putting the graphite plate into an oven for baking; before baking, the graphite plate is supported by a supporting piece, so that the rubber strip is not extruded, and the original shape is kept;

s7, placing the graphite plate on the adsorption jig again, enabling the B surface of the graphite plate to face upwards, sucking the graphite plate by using the adsorption jig, moving the adsorption jig and the graphite plate on the adsorption jig to the position below the automatic dispenser, and starting the automatic dispenser to dispense glue on the B surface of the graphite plate according to a sealing track;

s8, putting the graphite plate into an oven for baking; before baking, the graphite plate is supported by a supporting piece, so that the rubber strip is not extruded, and the original shape is kept;

and S9, detecting the tightness, and measuring the tightness of the three circuits, namely the oxygen channel, the hydrogen channel and the cooling channel under 100KP α.

Furthermore, the adsorption jig comprises a working platform, at least one adsorption device for generating suction by utilizing the Venturi effect and a plurality of supporting strips, wherein the adsorption device and the supporting strips are arranged on the working platform, and the suction direction of the adsorption device is vertical to the downward direction; the plurality of bearing strips are arranged around the adsorption device.

Furthermore, the plurality of bearing strips are enclosed into a rectangle, and the top surfaces of the plurality of bearing strips are flush with the top surface of the adsorption device; at least one of the two opposite bearing strips is detachably arranged on the working platform, and the materials with different sizes are met by adjusting the distance between the two opposite bearing strips.

Furthermore, at least one of the two opposite supporting strips is fixed on the working platform in a screw or magnetic attraction mode.

Furthermore, the adsorption jig further comprises a moving module, the working platform is mounted on the moving module, and the moving module can drive the working platform to reciprocate along the linear direction.

Further, the automatic glue dispenser adopts a high-precision screw valve for dispensing and a precision needle head.

Furthermore, the glue for dispensing is polyisobutylene, the storage temperature is-5 ℃ to +10 ℃, direct sunlight is avoided, sealing is required before and after use, and the glue can be applied only after being unfrozen to normal temperature before being taken out.

Further, in the steps S3, S5, and S7, the baking time in the oven is 90 minutes, and the temperature is 130 °.

Further, the steps S1, S4, and S6 further include dispensing path setting, height setting, and speed setting; the dispensing path is divided into a starting point-straight line 1-straight line 2-straight line 3-straight line 4, and a position is set on a long straight line; wherein, the length from the starting point to the straight line 1 is set to be 5mm, the length from the straight line 1 to the straight line 2 is set to be 8mm, the length from the straight line 2 to the straight line 3 is set to be 8mm, and the length from the straight line 3 to the straight line 4 is set to be 8 mm; the height of the starting point is set to be 0.2mm from the needle to the bottom surface of the graphite plate groove, and the dispensing height of the straight line 1 is set to be 0.8mm from the needle to the bottom surface of the groove; and respectively writing the glue dispensing speed in each interval from the starting point to the straight line 4, dispensing at an increasing speed, and determining the size of the adhesive tape by controlling the glue dispensing speed.

Further, the steps S1, S4, and S6 further include ending the dispensing setting, where the line of line 2 from the last is the same as the starting point coordinate setting and is overlapped at the same point, the length of the line of line 1 from the last and the line of line 2 from the last is set to 20mm, and the advanced glue closing distance is 20 mm.

Compared with the prior art, the invention has the beneficial effects that:

the invention provides a set of sealing method sealing modes convenient for automatic production aiming at a graphite plate, which comprises the operation steps of manufacturing the graphite plate, adsorbing and fixing before dispensing, dispensing process setting, automatic dispensing, baking, preventing deformation of an adhesive tape, detecting airtightness after dispensing and the like. Compared with the existing glue injection mode, the glue dispensing sealing mode has the advantages that the sealing performance is better, the automation degree is high, the mass production is facilitated, and the production efficiency is improved.

Drawings

Fig. 1 is a flowchart of a dispensing method for graphite plates of a hydrogen fuel cell according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a tooling fixture for manufacturing a graphite plate according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of an adsorption jig for fixing a graphite plate according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a linear dispensing path dispensing setting according to an embodiment of the present invention;

fig. 5 is a schematic diagram of a T-shaped dispensing path dispensing setting according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1, a dispensing method for graphite plates of a hydrogen fuel cell according to an embodiment of the present invention is shown, which includes the following steps:

s1, engraving by using an engraving machine to manufacture a hydrogen plate and an air plate;

s2, placing the hydrogen light plate on an adsorption jig, starting the adsorption jig and adsorbing the hydrogen light plate, then moving the adsorption jig and the hydrogen light plate on the adsorption jig to the lower part of the automatic dispenser, and starting the automatic dispenser to dispense the hydrogen light plate according to a sealing track;

s3, providing a tooling jig, referring to fig. 2, which comprises a trough 11 and a pressing plate 12 capable of being in threaded connection with the top of the trough 11, placing an air plate into the trough 11, attaching the air plate to a hydrogen optical plate with glue, and repeatedly attaching and stacking the air plate and the hydrogen optical plate according to the number of required graphite plate layers to obtain a graphite plate;

s4, placing the pressing plate 12 on the graphite plate, pressing the graphite plate tightly, locking the graphite plate by screws, and placing the graphite plate into an oven for baking;

s5, placing the graphite plate on an adsorption jig, enabling the A surface of the graphite plate to face upwards, starting the adsorption jig to adsorb the graphite plate, then moving the adsorption jig and the graphite plate on the adsorption jig to the lower side of an automatic dispenser, and starting the automatic dispenser to dispense glue on the A surface of the graphite plate according to a sealing track; the automatic dispenser adopts a high-precision screw valve for dispensing and a precision needle head; the glue for dispensing is polyisobutylene, the storage temperature is-5 ℃ to +10 ℃, direct sunlight is avoided, sealing is needed before and after use, and the glue can be applied after being unfrozen to normal temperature before being taken out.

S6, placing the graphite plate into an oven to be baked for 90 minutes at the temperature of 130 degrees; before baking, the graphite plate is supported by the supporting piece, so that the rubber strip is not extruded, and the original shape is kept.

S7, placing the graphite plate on the adsorption jig again, enabling the B surface of the graphite plate to face upwards, then moving the adsorption jig and the graphite plate on the adsorption jig to the lower side of the automatic dispenser, and starting the automatic dispenser to dispense glue on the B surface of the graphite plate according to the sealing track.

S8, placing the graphite plate into an oven for baking for 90 minutes at the temperature of 130 degrees; before baking, the graphite plate is supported by the supporting piece, so that the rubber strip is not extruded, and the original shape is kept.

And S9, detecting the tightness, and measuring the tightness of the three circuits, namely the oxygen channel, the hydrogen channel and the cooling channel under 100KP α.

The specific structure of the adsorption jig is not limited, and any structure that fixes the graphite plate by the adsorption force can be used as the adsorption jig of the present invention.

Optionally, in the present embodiment, a specially manufactured adsorption jig 2 is adopted, please refer to fig. 3, where the adsorption jig 2 includes a working platform 21, at least one adsorption device 22 for generating a suction force by using a venturi effect, a plurality of supporting bars 23, and a moving module 24.

The adsorption device 22 and the supporting strip 23 are installed on the working platform 21, and the suction direction of the adsorption device 22 is vertically downward. The plurality of supporting strips 23 are arranged around the adsorption device 22 and form a rectangle. The top surfaces of the bearing strips 23 are flush with the top surface of the adsorption device 22, so that the flatness of the graphite plate is ensured.

Specifically, at least one of the two opposite support strips 23 is detachably mounted on the working platform 21, and the materials with different sizes are satisfied by adjusting the distance between the two opposite support strips 23. In practical operation, one of the two opposite support strips 23, 23 is fixed on the working platform 21 by means of screws or magnetic attraction.

The working platform 21 is installed on the moving module 24, and the moving module 24 can drive the working platform 21 to reciprocate along a linear direction.

Further, the steps S1, S4, and S6 further include dispensing path setting, length setting, height setting, speed setting, and end point setting. The following will be described in detail with reference to two different dispensing paths:

for the straight dispensing path, please refer to fig. 4, the dispensing path is divided into a starting point-straight line 1-straight line 2-straight line 3-straight line 4. Wherein, the length from the starting point to the straight line 1 is set to be 5mm, the length from the straight line 1 to the straight line 2 is set to be 8mm, the length from the straight line 2 to the straight line 3 is set to be 8mm, and the length from the straight line 3 to the straight line 4 is set to be 8 mm; the height of the starting point is set to be 0.2mm from the needle to the bottom surface of the graphite plate groove, and the dispensing height of the straight line 1 is set to be 0.8mm from the needle to the bottom surface of the groove; and respectively writing the glue dispensing speed in each interval from the starting point to the straight line 4, dispensing at an increasing speed, and determining the size of the adhesive tape by controlling the glue dispensing speed. End point setting: the line of the 2 nd from last line is the same as the coordinate of the starting point, and is superposed at the same point, the length of the line of the 1 st from last line and the line of the 2 nd from last line is set to be 20mm, and the distance of closing glue in advance is about 20 mm.

For the dispensing path of the T-shape, please refer to fig. 5, the dispensing path is divided into: starting point-straight line 1-straight line 2-straight line 3-straight line 4. The height of the starting point is set to be 0.8mm from the needle head to the bottom surface of the groove, and the position is set on a long straight line. The length of starting point to 1 straight line sets up to 3mm, and straight line 1 to 2 straight line length sets up to 5mm, and straight line 2 to 3 straight lines set up to 5mm, and straight line 3 to 4 straight lines set up to 5mm, and the length of starting point to 4 each sections of straight line needs to be set for according to whole line length, and speed sets up: the starting point-the straight line 4 is written into the dispensing speed in each row respectively, dispensing is carried out at the increasing speed, and the size of the adhesive tape is determined by controlling the dispensing speed. End point setting: the starting point and the last 1 linear coordinate coincide with the central line of the corresponding lapping wire strip, and the dispensing needle head is set to start to rapidly pull back.

The embodiment provides a set of sealing method sealing modes convenient for automatic production for a graphite plate, and the sealing method comprises the operation steps of manufacturing the graphite plate, adsorbing and fixing before dispensing, dispensing process setting, automatic dispensing, baking, preventing deformation of an adhesive tape, detecting airtightness after dispensing and the like. Moreover, the glue dispensing sealing mode of the embodiment is better in sealing performance compared with the existing glue injecting mode, is high in automation degree compared with the mode of arranging the sealing ring, is beneficial to large-batch production, and improves production efficiency.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.