CN112002920A - Electrode continuous material belt, electric pile and preparation method thereof - Google Patents
Electrode continuous material belt, electric pile and preparation method thereof Download PDFInfo
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- CN112002920A CN112002920A CN202010783361.3A CN202010783361A CN112002920A CN 112002920 A CN112002920 A CN 112002920A CN 202010783361 A CN202010783361 A CN 202010783361A CN 112002920 A CN112002920 A CN 112002920A
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- 238000009792 diffusion process Methods 0.000 claims abstract description 43
- 238000000034 method Methods 0.000 claims abstract description 29
- 239000007772 electrode material Substances 0.000 claims abstract description 21
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Classifications
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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
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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
- H01M8/0273—Sealing or supporting means around electrodes, matrices or membranes with sealing or supporting means in the form of a frame
-
- 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
-
- 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
Abstract
The invention relates to an electrode continuous material belt, a galvanic pile and a preparation method thereof. Under the supporting and bearing action of the frame material belt, the electrode continuous material belt is also in a continuous material belt form. When the electric pile is stacked, a plurality of battery units can be stacked in a mode of being sequentially folded to obtain the electric pile, so that the preparation process of the electric pile can be effectively simplified, and material circulation is reduced. In the folding process, the fuel cell chip is clamped between the gas diffusion layers positioned at two sides, so that the fuel cell chip can be better protected and prevented from being damaged in the stacking process. In addition, the frame material belt inherent in the continuous electrode material belt is used as a carrier in the folding process, and other auxiliary materials are not required to be introduced, so that the step of removing the auxiliary materials is not required after the folding is finished, the working procedure is further simplified, and materials are saved. Therefore, the production efficiency of the fuel cell can be improved and the cost can be reduced.
Description
Technical Field
The invention relates to the technical field of fuel cell processing, in particular to an electrode continuous material belt, a galvanic pile and a preparation method thereof.
Background
One of the most central steps in the fabrication of fuel cells is the preparation of the stack. The materials used for preparing the electric pile mainly comprise MEA (membrane Electrode assemblies) membrane electrodes and bipolar plates. At present, the common production method is to use single MEA membrane electrodes and bipolar plates stacked alternately to produce the stack. However, this method has many processes and complicated material circulation, resulting in low production efficiency of the fuel cell.
Disclosure of Invention
Therefore, it is necessary to provide an electrode continuous material belt, a galvanic pile and a preparation method thereof, which can improve the production efficiency, aiming at the problem of low production efficiency of the fuel cell.
An electrode continuous strip of material comprising:
a frame material belt;
the fuel cell chips are attached to one side of the frame material belt and are arranged at intervals along the extending direction of the frame material belt; and
and the gas diffusion layers are positioned on two opposite sides of each fuel cell chip, and each fuel cell chip and the gas diffusion layers on two sides form a cell unit.
In one embodiment, the frame material strip is formed with a crease line in a region between two adjacent fuel cell chips, and the crease line is perpendicular to the extending direction of the frame material strip.
In one embodiment, the fuel cell module further comprises a second frame covering one side of the fuel cell chip, which faces away from the frame material belt.
In one embodiment, the second frame is in a belt shape and is consistent with the extending direction of the frame material belt; or
The second frames are in a sheet shape, and the second frames are respectively covered on the surfaces of the fuel cell chips.
The continuous electrode material belt is also in a continuous material belt form under the supporting and bearing effects of the frame material belt. In stacking the stack, a plurality of battery cells may be stacked in a sequentially folded manner to obtain a stack. Therefore, when the electrode continuous material belt is applied to the preparation of the electric pile, the MEA membrane electrode which is in a sheet shape is not required to be cut in advance, so that the preparation process of the electric pile can be effectively simplified, the material circulation is reduced, and the production efficiency is improved.
A stack, comprising:
the continuous strip of electrode material as in any one of the above preferred embodiments, wherein the continuous strip of electrode material is folded to stack a plurality of the battery cells;
the bipolar plate is clamped between two adjacent battery units; and
and the end cover assembly is covered at two opposite ends of the electrode continuous material belt.
In one embodiment, the end cap assembly includes an end plate, an insulating plate, and a unipolar plate, which are stacked in sequence, and the unipolar plate is located on a side of the end cap assembly facing the electrode continuous material strip.
The electric pile is formed by folding continuous electrode continuous material belts. Wherein a plurality of battery cells are stacked. The plurality of fuel cell chips are arranged on the frame material belt at intervals and form a cell unit together with the gas diffusion layer. That is, the folded region in the stack does not have a fuel cell chip and a gas diffusion layer. Therefore, the galvanic pile obviously reduces the waste of raw materials and has lower cost.
A method for preparing a galvanic pile comprises the following steps:
providing or preparing a continuous strip of electrode material as described in any one of the above preferred embodiments;
and folding the electrode continuous material belt so as to enable two adjacent battery units to be sequentially stacked, and inserting a bipolar plate between the two adjacent battery units.
In one embodiment, the step of preparing the continuous strip of electrodes comprises:
applying a plurality of fuel cell chips at intervals along the extending direction of the frame material belt;
the gas diffusion layers are disposed on opposite sides of each of the fuel cell chips.
In one embodiment, before the step of disposing the gas diffusion layers on opposite sides of each of the fuel cell chips, the step of preparing the continuous strip of electrode material further comprises: and a second frame is pasted on one side of the fuel cell chip, which is back to the frame material belt.
In one embodiment, the method further includes, before the step of folding the continuous strip of electrodes, a step of stacking a first end plate, a first insulating plate, and a first unipolar plate in sequence, where the step of folding the continuous strip of electrodes includes folding the continuous strip of electrodes on a surface of the first unipolar plate;
after the step of folding the continuous strip of electrodes, the method further comprises the step of sequentially stacking a second unipolar plate, a second insulating plate and a second end plate at one end of the continuous strip of electrodes.
According to the preparation method of the electric pile, the electrode continuous material belt is folded according to the Z-shaped path, and is not required to be pre-cut into sheets, so that the preparation process of the electric pile can be effectively simplified, and material circulation is reduced. In the folding process, the fuel cell chip is clamped between the gas diffusion layers positioned at two sides, so that the fuel cell chip can be better protected and prevented from being damaged in the stacking process. In addition, the frame material belt inherent in the continuous electrode material belt is used as a carrier in the folding process, and other auxiliary materials are not required to be introduced, so that the step of removing the auxiliary materials is not required after the folding is finished, the working procedure is further simplified, and materials are saved. Therefore, the preparation method of the electric pile can improve the production efficiency and reduce the cost.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram illustrating a partial lamination structure of an electrode continuous material tape according to a preferred embodiment of the present invention;
fig. 2 is a schematic structural view of a frame tape in the electrode continuous tape shown in fig. 1;
fig. 3 is a schematic view of a partial laminated structure of an electrode continuous material tape according to another embodiment of the present invention;
FIG. 4 is a schematic view of a partial lamination structure of a continuous strip of electrode material according to yet another embodiment of the present invention;
FIG. 5 is a schematic diagram of a stack structure according to a preferred embodiment of the present invention;
FIG. 6 is a schematic view showing a stacked structure of the cell stack shown in FIG. 5;
FIG. 7 is a schematic flow chart of a method for preparing a galvanic pile according to a preferred embodiment of the present invention;
fig. 8 is a schematic flow chart of preparing the electrode continuous material belt in the preparation method of the pile shown in fig. 7.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
The invention provides an electrode continuous material belt, a galvanic pile and a preparation method of the galvanic pile.
Referring to fig. 1, an electrode continuous tape 100 according to a preferred embodiment of the present invention includes a frame tape 110, a fuel cell chip 120, and a gas diffusion layer 130.
The frame strip 110 serves as a support and can be rolled into a roll. The frame tape 110 may be a strip tape structure formed by a PI (Polyimide) film. Along the extending direction of the frame material tape 110, a plurality of openings are generally disposed at intervals. The surface of the frame tape 110 facing the fuel cell chips 120 is typically coated with a thermosetting or pressure sensitive adhesive.
The fuel cell chip 120 is a ccm (catalyst Coated membrane) module. The number of the fuel cell chips 120 is multiple, and the multiple fuel cell chips 120 are attached to one side of the frame tape 110 and are arranged at intervals along the extending direction of the frame tape 110. Specifically, the fuel cell chips 120 may be attached to the frame tape 110 by hot pressing, cold pressing, or the like, and the plurality of fuel cell chips 120 correspond to the plurality of openings on the frame tape 110, respectively.
The fuel cell chips 120 may be cut into sheet materials from a roll stock in advance. The fuel cell chip 120 includes a proton membrane and catalyst layers formed on both sides of the proton membrane, the catalyst layers are formed by curing catalyst slurry coated on both sides of the proton membrane, and the catalyst slurry forms a cathode catalyst layer (hereinafter, referred to as a cathode) and an anode catalyst layer (hereinafter, referred to as an anode) on both sides of the proton membrane, respectively. The components of the catalyst slurry for the anode coating and the cathode coating may be the same or different. When there is a difference in the components of the cathode and anode catalyst slurry, the plurality of fuel cell chips 120 are alternately disposed on the frame tape 110. That is, the adjacent two fuel cell chips 120 face oppositely, and if the anode of the previous fuel cell chip 120 faces upward, the anode of the next fuel cell chip 120 needs to face downward.
Gas diffusion layers 130 are located on opposite sides of each fuel cell chip 120. The gas diffusion layer 130 may be a carbon paper, which is porous and loose inside and is in gas diffusion communication. Gas diffusion layer 130 may have the same or substantially the same contour as fuel cell chip 120, or may be larger than fuel cell chip 120, and may completely cover fuel cell chip 120. The gas diffusion layer 130 may be directly attached to the surface of the fuel cell chip 120, or may be connected to the fuel cell chip 120 through an intermediate element.
In this embodiment, the electrode continuous tape 100 further includes a second frame 140 covering the side of the fuel cell chip 120 facing away from the frame tape 110.
The second frame 140 may be made of the same material as the frame tape 110, and may be attached to the fuel cell chip 120 by hot pressing or cold pressing. Moreover, the second frame 140 also has openings and flow channels for supporting and guiding the flow. At this time, the gas diffusion layers 130 on both sides of each fuel cell chip 120 may be respectively attached to the frame tape 110 and the surface of the second frame 140 facing away from the fuel cell chip 120.
It should be noted that in other embodiments, the second frame 140 may be omitted for the single-frame structure of the electrode continuous material tape 100. As shown in fig. 4, the lower gas diffusion layer 130 is attached to the surface of the frame tape 110 facing away from the fuel cell chip 120, and the upper gas diffusion layer 130 is directly attached to the surface of the fuel cell chip 120.
The second frame 140 may be a sheet-like structure cut into a single piece or may be a continuous frame strip. As shown in fig. 1, in the present embodiment, the second frame 140 is sheet-shaped, and the plurality of second frames 140 respectively cover the surfaces of the plurality of fuel cell chips 120. In this case, the outline of the second frame 140 is substantially the same as that of the fuel cell chip 120, and material can be saved.
In another embodiment, as shown in fig. 3, the second frame 140 is in the form of a band and extends in the same direction as the frame tape 110. At this time, the second frame 140 and the frame tape 110 have the same structure and are in the form of a continuous tape. When the second frame 140 is attached, pre-slicing is not needed, so that the processing is more convenient, the efficiency can be improved, and the cost can be saved.
Further, each fuel cell chip 120 and the gas diffusion layers 130 on both sides constitute one cell unit 11. The portions of the electrode continuous strip 100 shown in fig. 1 to 4 each contain two battery cells 11. The unit cell 11 functionally corresponds to an MEA membrane electrode, which is a basic unit of electrochemical reaction of the fuel cell, and a plurality of unit cells 11 are stacked on each other, and a bipolar plate is disposed between two adjacent unit cells 11, thereby fabricating a stack of the fuel cell.
The continuous strip of electrodes 100 is also in the form of a continuous strip of material under the supporting and supporting action of the frame strip 110. When the electrode continuous material belt 100 is used for producing a pile, a Z-shaped lamination mode can be adopted. The general flow is as follows:
laying a first battery unit 11, and then stacking a bipolar plate on the first battery unit 11; folding the continuous strip of electrode material 100 so that the second cell 11 is stacked with the first cell 11 and a next bipolar plate is stacked on the surface of the second cell 11; and so on until the last cell 11 is completely stacked. Since the electrode continuous material tape 100 is formed in a zigzag shape and the tracks of the electrode continuous material tape are formed in a zigzag shape, the method is called a zigzag lamination method.
The stack of Z-shaped laminations is shown in fig. 5, with a bipolar plate sandwiched between two adjacent cells 11. Therefore, when the electrode continuous material belt 100 is applied to the preparation of the electric pile, the electrode continuous material belt does not need to be pre-cut into sheets, so that the preparation process of the electric pile can be effectively simplified, the material circulation is reduced, and the production efficiency is improved.
Referring to fig. 2, in the present embodiment, a crease line 111 is formed in a region of the frame material tape 110 between two adjacent fuel cell chips 120, and the crease line 111 is perpendicular to an extending direction of the frame material tape 110.
Specifically, the frame material tape 110 may be formed with a crease line 111 by means of dashed line blanking, hot-pressing a folding line, and the crease line 111 may ensure that the frame material tape 111 is folded along a predetermined direction. Therefore, when the electrode continuous material belt 10 is further processed in a Z-type lamination manner, the alignment degree of each battery unit 11 stack can be ensured without CCD positioning, thereby saving positioning time and contributing to further improving production efficiency.
After the application of the gas diffusion layer 130 is completed, the electrode continuous strip 100 is punched to form channels for gas and liquid to flow through. At the same time, the folding lines 111 between the fuel cell chips 120 may be formed by a dotted line punching or a hot pressing.
Referring to fig. 5 and 6, a stack 200 in accordance with a preferred embodiment of the present invention includes a continuous strip of electrode material 100, bipolar plates 210, and end cap assemblies 220.
The structure of the electrode continuous material tape 100 may be as shown in fig. 1, 3, and 4, and in this embodiment, the electrode continuous material tape 100 shown in fig. 1 is selected. By folding, a plurality of battery cells 11 are stacked in the electrode continuous material tape 100. Specifically, the continuous strip of electrode material 100 is laminated in a Z-lamination manner as described above. While stacking, bipolar plates 210 are inserted between adjacent two cells 11. Thus, in the formed stack 200, the bipolar plate 210 may be sandwiched between the adjacent two unit cells 11.
As shown in fig. 5 and 6, the formed cell stack 200 has a flat region 101 and a bent region 102. The flat region 101 is located at the middle, is formed by the battery cells 11 stacked on each other, and is a region where electrochemical reaction of the stack 200 occurs; the bending regions 102 are located at two sides and are formed by the regions of the frame tape 110 of the primary electrode continuous tape 100 located between two adjacent fuel cell chips 120, where no electrochemical reaction occurs.
It can be seen that the bending region 102 does not include materials such as proton membrane and carbon paper, and only includes the frame material tape 110. Compared with proton membrane, the frame material tape 110 is cheaper and lower in cost. That is, the region of the stack 200 where electrochemical reaction does not occur does not include expensive materials such as proton membrane and carbon paper. Therefore, the above-described stack 200 significantly reduces the waste of raw materials, with a lower cost.
The bipolar plates 210 may be flexible graphite plates or composite graphite plates, and the bipolar plates 210 on both sides of the same cell 11 may be used as an anode plate and a cathode plate of the cell 11, respectively. When electrochemical reaction occurs in the stack 200, hydrogen reaches the anode through the gas flow field on the anode plate, reaches the anode catalyst layer through the gas diffusion layer 130, and is adsorbed on the anode catalyst layer; the hydrogen is decomposed into 2 hydrogen ions, namely protons H under the catalytic action of catalyst platinum+And 2 electrons are released.
Oxygen or air reaches the cathode through a gas flow field on the cathode plate, reaches the cathode catalytic layer through the gas diffusion layer 130 and is adsorbed on the cathode catalytic layer; meanwhile, the hydrogen ions pass through the proton membrane to reach the cathode, and the electrons also reach the cathode through an external circuit. Under the action of the cathode catalyst, oxygen reacts with hydrogen ions and electrons to generate water. The electrons form current under the connection of an external circuit, and then electric energy can be output. The same electrochemical reaction process occurs in the plurality of battery cells 11 in the stack 200, and the generated electric energy is converged and output.
The end cap assembly 220 covers opposite ends of the electrode continuous strip 100. The end cap assemblies 220 at the two ends may have the same structure, and the end cap assemblies 220 may clamp the folded electrode continuous material tape 100 and may lead out the battery pins.
In this embodiment, the end cap assembly 220 includes an end plate 221, an insulating plate 223, and a unipolar plate 225, which are stacked in this order, and the unipolar plate 225 is located on a side of the end cap assembly 220 facing the electrode continuous material tape 100. The end plate 221 may be a metal plate on which pins may be disposed to lead out the positive and negative electrodes of the battery. The unipolar plate 225 may have the same structure as the bipolar plate 210, or may be a metal plate.
Referring to fig. 7, the method for fabricating a stack according to the preferred embodiment of the present invention includes steps S310 to S320:
step S310: the electrode continuous strip 100 is provided or prepared.
The structure of the electrode continuous material tape 100 may be as shown in fig. 1, fig. 3 or fig. 4, in this embodiment, the electrode continuous material tape 100 shown in fig. 1 is used, and the electric pile 200 shown in fig. 5 and fig. 6 may be manufactured. The electrode continuous tape 100 includes a frame tape 110, a fuel cell chip 120, and a gas diffusion layer 130. When the galvanic pile is prepared, the prepared electrode continuous material belt 100 can be directly selected, or the electrode continuous material belt 100 can be prepared first.
Referring to fig. 6, in the present embodiment, the step of preparing the electrode continuous material tape 100 includes steps S410 to S420:
in step S410, a plurality of fuel cell chips 120 are attached at intervals along the extending direction of the frame tape 110.
The frame strip 110 serves as a support and can be rolled into a roll. The specific structure, material and function of the above-mentioned materials are described in detail, and thus are not described herein again. The openings and flow channels of the frame material strip 110 may be pre-formed, or may be processed after the electrode continuous material strip 100 is prepared.
The plurality of fuel cell chips 120 may be cut from a roll stock in advance to obtain a sheet stock. The fuel cell chips 120 may be attached to the frame material tape 110 by a thermal compression method or a gluing method, and the plurality of fuel cell chips 120 correspond to the plurality of openings on the frame material tape 110, respectively. The specific structure, material and function of the fuel cell chip 120 are described in detail above, and therefore will not be described herein again.
Step S420, gas diffusion layers 130 are disposed on two opposite sides of each fuel cell chip 120, wherein one gas diffusion layer 130 is attached to one side of the frame tape 110 facing away from the fuel cell chip 120.
The gas diffusion layer 130 may be a carbon paper, which is porous and loose inside and is in gas diffusion communication. The carbon paper may be cut prior to preparing the electrode continuous web 100 to obtain a sheet of carbon paper having the same or substantially the same profile as the fuel cell chips 120. The gas diffusion layer 130 may be directly attached to the surface of the fuel cell chip 120 or the surface of the frame tape 110 by thermal compression or gluing.
Further, in this embodiment, before the step S420, the step of preparing the electrode continuous material tape 100 further includes: a second frame 140 is attached to the side of the fuel cell chip 120 facing away from the frame tape 110, and another gas diffusion layer 130 of each cell unit 11 is attached to the side of the second frame 140 facing away from the fuel cell chip 120.
The second frame 140 may be made of the same material as the frame material tape 110, or may be attached to the fuel cell chip 120 by thermal compression or gluing. Moreover, the second frame 140 also has openings and flow channels for supporting and guiding the flow. At this time, when the gas diffusion layers 130 are disposed on both sides of each fuel cell chip 120, the gas diffusion layers 130 on both sides are respectively attached to the surfaces of the frame tape 110 and the second frame 140 facing away from the fuel cell chip 120.
The detailed structure, material and function of the second frame 140 have been described in detail above, and therefore are not described herein again.
It should be noted that in other embodiments, the second frame 140 may be omitted for the single-frame structure of the electrode continuous material tape 100. At this time, when the gas diffusion layers 130 are disposed on two sides of each fuel cell chip 120, one gas diffusion layer 130 may be directly attached to the surface of the fuel cell chip 120, and the other gas diffusion layer 130 may be attached to the surface of the frame tape 110 facing the fuel cell chip 120.
Step S320: the continuous strip of electrode material 100 is folded in a zigzag path so that a plurality of cells 11 are stacked in sequence with bipolar plates 210 interposed between two adjacent cells 11.
Specifically, the process of folding the electrode continuous material tape 100 is roughly as follows:
laying a first battery unit 11, and then stacking a bipolar plate on the surface of the first battery unit 11; folding the continuous strip of electrode material 100 so that the second cell 11 is stacked with the first cell 11, and stacking a next bipolar plate on the surface of the second cell 11; and so on, completing the third and fourth, and till the last battery unit 11 is stacked. Since the electrode continuous material tape 100 is formed in a zigzag shape and the tracks of the electrode continuous material tape are formed in a zigzag shape, the lamination is called zigzag lamination.
The specific structure, material and function of the bipolar plate 210 are described in detail above, and therefore will not be described in detail herein.
When the electric pile is prepared, the continuous electrode continuous material belt 100 is adopted for folding, and the electric pile is not required to be cut into sheets in advance, so that the preparation process of the electric pile can be effectively simplified. Moreover, the electrode continuous material belt 100 can realize continuous circulation, and material circulation links can be reduced. During the folding process, the fuel cell chip 120 is sandwiched between the gas diffusion layers 130 on both sides, so that the fuel cell chip 120 can be well protected. The fuel cell chip 120 is thin (typically below 0.03 mm) and protected from damage during stacking by the gas diffusion layer 130.
In addition, the frame material belt 110 inherent to the electrode continuous material belt 100 is used as a carrier in the folding process, and other auxiliary materials are not required to be introduced, so that a step of removing the auxiliary materials is not required after the folding is completed, and the process is further simplified and materials are saved. Moreover, the frame material belt 110 has high toughness, so that the frame material belt is not easily scratched in a circulation station, and is not easily deformed and broken due to tension change, so that the reliability of the processing process can be improved.
In this embodiment, the step S320 includes:
stacking a first end plate, a first insulating plate and a first unipolar plate in sequence; laying a first battery unit 11 on the surface of the first unipolar plate, and folding the electrode continuous material 100 strip until the last battery unit 11 is completely laminated; a second unipolar plate, a second insulating plate, and a second end plate are sequentially stacked on the surface of the last battery cell 11.
The second single-pole plate, the second insulating plate and the second end plate can be respectively the same as the first single pole, the first insulating plate and the first end plate in structure and material. After the stack is formed, the first end plate, the first insulating plate, and the first unipolar plate constitute the end cap assembly 220 at the bottom of the stack 200 shown in fig. 5, and the second unipolar plate, the second insulating plate, and the second end plate constitute the end cap assembly 220 at the top of the stack 200 shown in fig. 5.
When the electrode continuous material 100 is folded, a first battery unit 11 is laid on the first unipolar plate, and then a bipolar plate is stacked on the surface of the first battery unit 11; folding the continuous strip of electrode material 100 so that the second cell 11 is stacked with the first cell 11, and stacking a next bipolar plate on the surface of the second cell 11; and so on, completing the third and fourth, and till the last battery unit 11 is stacked.
That is, in the process of preparing the electric pile 200, the electrode continuous material belt 100 is first stacked on the bottom end cover assembly 220; after the electrode continuous material strip 100 is folded, the second unipolar plate, the second insulating plate, and the second end plate are stacked, so that the end cap assembly 220 at the top is directly formed at the end of the electrode continuous material strip 100. Accordingly, there is no need to move and turn over the folded electrode continuous strip 100 in order to arrange the end cap assembly 220, which is advantageous for maintaining the stability of the folded electrode continuous strip 100.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An electrode continuous strip of material, comprising:
a frame material belt;
the fuel cell chips are attached to one side of the frame material belt and are arranged at intervals along the extending direction of the frame material belt; and
the gas diffusion layers are positioned on two opposite sides of each fuel cell chip, and each fuel cell chip and the gas diffusion layers on the two sides form a cell unit;
and one gas diffusion layer of each battery unit is attached to one side, back to the fuel cell chip, of the frame material belt.
2. The electrode continuous strip of material as claimed in claim 1, wherein the border strip of material is formed with a crease line in a region between two adjacent fuel cell chips, and the crease line is perpendicular to an extending direction of the border strip of material.
3. The electrode continuous tape of claim 1, further comprising a second frame covering a side of the fuel cell chip facing away from the frame tape, wherein another gas diffusion layer of each of the cell units is attached to a side of the second frame facing away from the fuel cell chip.
4. The electrode continuous tape of claim 3, wherein the second frame is in a tape shape and has a direction that is consistent with the extending direction of the frame tape; or
The second frames are in a sheet shape, and the second frames are respectively covered on the surfaces of the fuel cell chips.
5. An electrical stack, comprising:
the continuous strip of electrode material as claimed in any one of claims 1 to 4, wherein the continuous strip of electrode material is folded to stack a plurality of said battery cells;
the bipolar plate is clamped between two adjacent battery units; and
and the end cover assembly is covered at two opposite ends of the electrode continuous material belt.
6. The electric pile of claim 5 wherein the end cap assembly comprises an end plate, an insulating plate and a unipolar plate stacked in sequence, the unipolar plate being located on a side of the end cap assembly facing the continuous strip of electrodes.
7. A method for preparing a galvanic pile is characterized by comprising the following steps:
providing or preparing a continuous strip of electrode material according to any one of claims 1 to 4;
and folding the continuous electrode material belt according to a Z-shaped path so as to enable a plurality of battery units to be sequentially stacked, and inserting a bipolar plate between two adjacent battery units.
8. The method for preparing a galvanic pile according to claim 7, wherein the step of preparing the continuous strip of electrode material comprises:
applying a plurality of fuel cell chips at intervals along the extending direction of the frame material belt;
the gas diffusion layers are arranged on two opposite sides of each fuel cell chip, and one of the gas diffusion layers is attached to one side, back to the fuel cell chip, of the frame material belt.
9. The method of making a stack according to claim 8, wherein prior to the step of disposing the gas diffusion layers on opposite sides of each of the fuel cell chips, the step of preparing the continuous strip of electrode material further comprises: and a second frame is attached to one side, back to the frame material belt, of the fuel cell chip, and the other gas diffusion layer of each cell unit is attached to one side, back to the fuel cell chip, of the second frame.
10. The method of claim 7, wherein the step of folding the continuous strip of electrode material in a zigzag path to stack a plurality of the battery cells in sequence and interposing a bipolar plate between two adjacent battery cells comprises:
stacking a first end plate, a first insulating plate and a first unipolar plate in sequence;
laying a first battery unit on the surface of the first unipolar plate, and folding the electrode continuous material belt until the last battery unit is completely laminated;
and sequentially stacking a second unipolar plate, a second insulating plate and a second end plate on the surface of the last battery cell.
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| CN202010783361.3A CN112002920A (en) | 2020-08-06 | 2020-08-06 | Electrode continuous material belt, electric pile and preparation method thereof |
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| CN202010783361.3A CN112002920A (en) | 2020-08-06 | 2020-08-06 | Electrode continuous material belt, electric pile and preparation method thereof |
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Effective date of registration: 20220129 Address after: 21412 North Hubin Road, Wuxi City, Jiangsu Province Applicant after: Jiangsu hydrogen guide intelligent equipment Co.,Ltd. Address before: No.20 Xinxi Road, national high tech Industrial Development Zone, Wuxi City, Jiangsu Province Applicant before: WUXI LEAD INTELLIGENT EQUIPMENT Co.,Ltd. |
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Application publication date: 20201127 |