CN110783599B - Dispensing method of graphite plate of hydrogen fuel cell - Google Patents
Dispensing method of graphite plate of hydrogen fuel cell Download PDFInfo
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- CN110783599B CN110783599B CN201910945965.0A CN201910945965A CN110783599B CN 110783599 B CN110783599 B CN 110783599B CN 201910945965 A CN201910945965 A CN 201910945965A CN 110783599 B CN110783599 B CN 110783599B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
- H01M8/0276—Sealing means characterised by their form
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
- H01M8/0286—Processes for forming seals
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
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.
Description
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.
In the prior art, a glue injection mode or a sealing ring mode is generally adopted to seal a reaction area. However, the injection method has poor sealing performance, and the method of providing the sealing ring means that, when assembling the fuel cell, the sealing ring is first installed in the corresponding groove, for example, the sealing ring is manually applied in the groove, and then a membrane electrode is placed between the two electrode plates with the sealing ring installed thereon, so that the electrode plates with the grooves, the sealing ring and the membrane electrode jointly seal the reaction region. Although the sealing performance is better in the mode of arranging the sealing ring, the automatic equipment is inconvenient to adopt for mass production.
The electrode plates are mainly divided into three types, namely metal plates, composite plates and graphite plates according to materials, wherein the graphite plates have the advantages of high conductivity, good conductivity and strong corrosion resistance, but have the defects of brittleness and difficulty in subsequent processing due to the fact that the thickness is not suitable to be thin.
Therefore, it is necessary to develop a sealing method for graphite plates, which is convenient for automatic production and can avoid material breakage.
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 of the oxygen channel, the hydrogen channel and the cooling channel under 100KP alpha.
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 of the oxygen channel, the hydrogen channel and the cooling channel under 100KP alpha.
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.
Claims (7)
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;
s9, detecting the tightness, namely measuring the air tightness of three loops of an oxygen air channel, a hydrogen air channel and a cooling channel under 100KP alpha;
the adsorption jig comprises a working platform, at least one adsorption device for generating suction by utilizing the Venturi effect and a plurality of bearing strips, wherein the adsorption device and the bearing strips are arranged on the working platform, and the suction direction of the adsorption device is vertical and downward; the plurality of bearing strips are arranged around the adsorption device;
the supporting strips are enclosed into a rectangle, and the top surfaces of the 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;
the steps S1, S4, and S6 further include dispensing path setting, height setting, and speed setting; the system comprises a straight dispensing path and a T-shaped dispensing path;
for the straight dispensing path, 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 the long straight line; wherein 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; 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; the steps S1, S4 and S6 further comprise ending glue dispensing setting, wherein the line of the 2 nd line from the last is the same as the coordinate setting of the starting point and is superposed at the same point, the length of the line of the 1 st line from the last and the line of the 2 nd line from the last is set to be 20mm, and the distance of glue closing in advance is 20 mm;
for a T-shaped dispensing path, the dispensing path is divided into a 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 a needle head to the bottom surface of a groove, a set position on a long straight line is selected, the length of each interval from the starting point to the straight line 4 needs to be set according to the length of the whole line, the dispensing speed is written into each interval from the starting point to the straight line 4 respectively, dispensing is carried out at an increasing speed, the size of an adhesive tape is determined by controlling the dispensing speed, the coordinates of the starting point and the last 1 straight line coincide with the central line of the corresponding overlapping line, and the dispensing needle head is set to start rapid pullback.
2. The method for dispensing the graphite plate of the hydrogen fuel cell according to claim 1, wherein at least one of the two opposite support strips is fixed on the working platform by screws or magnetic attraction.
3. The dispensing method of graphite plates for hydrogen fuel cells according to any one of claims 1 to 2, 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.
4. 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.
5. The method for dispensing glue on the graphite plate of the hydrogen fuel cell according to claim 1, wherein the glue used 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.
6. 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.
7. The method for dispensing graphite plates for hydrogen fuel cells according to claim 1, wherein for a straight dispensing path, the length from the starting point to the straight line 1 is set to 5mm, the length from the straight line 1 to the straight line 2 is set to 8mm, the length from the straight line 2 to the straight line 3 is set to 8mm, and the length from the straight line 3 to the straight line 4 is set to 8 mm.
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| CN109888327A (en) * | 2019-01-15 | 2019-06-14 | 安徽明天氢能科技股份有限公司 | A kind of fuel cell pile packaging technology |
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