CN110176618B - Electric pile packaging process and electric pile assembly - Google Patents

Electric pile packaging process and electric pile assembly Download PDF

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Publication number
CN110176618B
CN110176618B CN201910453365.2A CN201910453365A CN110176618B CN 110176618 B CN110176618 B CN 110176618B CN 201910453365 A CN201910453365 A CN 201910453365A CN 110176618 B CN110176618 B CN 110176618B
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stack
sealing plate
plate
assembly
laser
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CN110176618A (en
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陈继军
唐升智
张庶
伍林
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Leshan Weilide Energy Co ltd
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Leshan Weilide Energy Co ltd
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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
    • H01M8/18—Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells
    • H01M8/184—Regeneration by electrochemical means
    • H01M8/188—Regeneration by electrochemical means by recharging of redox couples containing fluids; Redox flow type batteries
    • 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
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • H01M8/2404—Processes or apparatus for grouping fuel cells
    • 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
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • H01M8/2465—Details of groupings of fuel cells
    • H01M8/247—Arrangements for tightening a stack, for accommodation of a stack in a tank or for assembling different tanks
    • H01M8/2475—Enclosures, casings or containers of fuel cell stacks
    • 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

Abstract

The application discloses a galvanic pile packaging process and a galvanic pile assembly. According to the process, the sealing plate is directly fused and coupled on the peripheral surface of the electric pile element through the laser transmission sealing plate, the side surface of each single cell of the electric pile element is fused and sealed, the sealing performance of the single electrode element of the flow battery is improved, the thickness and the gap among the assembly elements are kept consistent through the fused and coupled relation, the uniformity among the elements is good, and the service life of the electric pile is further prolonged.

Description

Electric pile packaging process and electric pile assembly
Technical Field
The invention relates to the field of full flow batteries, in particular to a galvanic pile packaging process, by which a galvanic pile assembly with good sealing performance and long service life can be obtained.
Background
Flow batteries are a type of secondary battery technology that utilizes a liquid electrolyte to generate an electrochemical reaction. The positive and negative active substances with different valence states are stored in the electrolyte and flow through the electric pile under the drive of the circulating pump, so that the active substances circulate in different liquid storage tanks and closed loops of the half batteries. The ionic membrane is used as a diaphragm between the anode and the cathode of the battery, and the electrolyte flows through the surface of the electrode to generate electrochemical reaction, so that the mutual conversion of electric energy and chemical energy is realized, and the storage and the release of the electric energy are realized.
When the flow battery is operated, the electrolyte realizes the circulation flow from the electric pile to the liquid storage tank under the action of the pump. In the prior art, a package housing of a stack assembly structure is generally pressed on a stack element through a fastener, and a labyrinth seal structure is arranged on the package housing or sealing is realized between package seal plates through a seal ring. However, since the electrolyte has a certain pressure in the operation process of the battery and is easy to corrode the sealing ring, when the sealing ring is aged, leakage is easy to occur, long-time effective sealing of the galvanic pile cannot be guaranteed, and the service life of the galvanic pile is short.
Disclosure of Invention
In view of this, the present application provides a stack packaging process and a stack assembly, and the sealing performance of the stack assembly obtained by the process is improved, and the service life of the stack is prolonged.
In order to solve the above technical problems, the present invention provides a method for packaging a stack, including:
sealing plates are arranged on the peripheral surfaces parallel to the stacking direction of the layered assemblies in the electric pile elements;
under a first condition, laser is transmitted through the sealing plate and absorbed by the contact surface of the sealing plate and the galvanic pile element, so that the sealing plate and the circumferential surface of the galvanic pile element are directly subjected to melt coupling to obtain a galvanic pile assembly;
at least in a first condition, the electric pile element is subjected to a first pre-tightening force along the stacking direction of the layered assembly and is kept tightly attached.
Preferably, the first condition includes:
the wavelength of the laser is 1800nm-2200 nm;
the linear energy density of the laser is 2-5.8J/mm.
Preferably, in the first condition, a second pre-tightening force perpendicular to the sealing plate is applied to the sealing plate, and under the action of the second pre-tightening force, the sealing plate is attached to the stack element, so that the sealing plate is coupled to the peripheral surface of the stack element under the action of laser;
under the second pretightening force, the clearance between the sealing plate and the stack element is not more than 0.15 mm.
Preferably, the closing plate is a polymer material having an absorption rate of the laser light of not less than 20%.
Preferably, the surface of the sealing plate facing to the side of the stack element is a non-smooth surface; or the periphery of the pile element facing the sealing plate is a non-smooth surface.
Preferably, the galvanic pile element comprises an ion exchange membrane, carbon felts, a flow guide frame and an electrode assembly are symmetrically arranged on two sides of the ion exchange membrane, and the flow guide frame is arranged on the side surface of the electrode assembly;
the bipolar plate is connected with the adjacent flow guide frame through fusion coupling;
the end face of the electrode assembly and the facing side of the sealing plate are both coupled to the sealing plate by laser melting under a first condition.
Preferably, the bipolar plate includes:
a bipolar plate;
the bipolar plate is connected with the adjacent polymer frame body through fusion coupling, the polymer frame body is used for clamping and fixing the bipolar plate, and the polymer frame body is used for isolating the bipolar plate from a flow channel on the flow guide frame.
A stack assembly comprising stack elements and cover plates coupled to a circumferential surface parallel to a stacking direction of layered assemblies in the stack elements, the stack assembly being obtained by the above-described stack packaging process.
Preferably, the galvanic pile element comprises an ion exchange membrane, and carbon felts, a flow guide frame and an electrode assembly are symmetrically arranged on two sides of the ion exchange membrane; the electrode assembly comprises a bipolar plate and polymer frame bodies arranged on two sides of the bipolar plate, the polymer frame bodies on two sides of the bipolar plate are clamped and fixed on the bipolar plate through fusion coupling, the bipolar plate is connected with the adjacent flow guide frames through fusion coupling, and the end face of the bipolar plate and the end face of the flow guide frame are made of materials which have compatibility with the sealing plate under the action of heat.
Preferably, the end face of the electrode assembly and the facing side of the sealing plate are both coupled to the sealing plate by laser melting under the first condition.
Compared with the prior art, the detailed description of the application is as follows:
the application discloses a galvanic pile packaging process and a galvanic pile assembly. And the laser transmission sealing plate enables the contact surface between the sealing plate and the stack element to be directly fused and coupled. The electric pile element is formed by connecting a plurality of single cells in series, electrolyte is introduced into each single cell, and when the sealing plate is in melt coupling on the peripheral surface of the electric pile element, the side surfaces of the electrode assembly and the guide frame in each single cell are in melt coupling with the sealing plate, so that the sealing performance of the flow battery electric pile is improved.
The electric pile element comprises a bipolar plate, a flow guide frame, a carbon felt and an ion exchange membrane; the adjacent flow guide frames fix the electrode assembly through fusion coupling, and when a first pretightening force is applied to the bipolar plate, the flow guide frames are tightly attached to the electrode assembly, so that the electric pile element forms a stable structure. The flow guide frame is in melt coupling with the seal plate on the premise that the flow guide frame is in melt coupling with the electrode assembly to ensure close fitting, so that the sealing performance of each assembly in the galvanic pile is further improved, and the service life of the galvanic pile is prolonged.
Because the periphery of the pile element is completely coupled with the sealing plates under the condition that the pile element is compressed by the first pretightening force, each assembly in the pile element receives the same first pretightening force, the electrode assembly and the flow guide frame keep higher flatness when being coupled with the sealing plates during packaging, the distribution of gaps between adjacent assemblies is uniform, and the consistency of gap distance is higher. Thereby improving the consistency of the single electrode elements in the electric pile. Because the consistency of the single electrode element is high, after the operation is tried for a certain time, the decrement of the coulomb efficiency of the pile is not less than 5%, and in addition, the energy efficiency and the attenuation of the platform voltage are little, thereby improving the service life of the pile.
Drawings
FIG. 1 is an exploded view of a stack assembly prepared by the process disclosed herein;
FIG. 2 is a schematic illustration of a package for making a stack assembly by the process disclosed herein;
fig. 3 is a schematic view showing a stacked state of components in the cell stack.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
As shown in the drawings, the single cell in the present application refers to a cell unit in a flow battery, and includes an ion exchange membrane, carbon felts symmetrically disposed on both sides of the ion exchange membrane, a flow guide plate, and an electrode formed by a current collector on one side of an electrode assembly; because the bipolar plate in the flow battery is usually in a prefabricated layered structure and plays a role of connecting the positive electrode and the negative electrode of the battery unit in series, the bipolar plate is not easy to split under a general condition, the single battery in the application is divided based on an electrochemical angle rather than the split structure.
Transparent as used herein means having good transmission of visible light, but not necessarily transparent at other wavelengths.
As shown, the present application discloses a stack packaging process, under a first condition, a laser transmits a sealing plate, and the sealing plate is melt-coupled on the surface of a stack element, so as to obtain a stack assembly with good sealing performance and long service life; and by applying a first pretightening force along the stacking direction of the bipolar plate on the galvanic pile element in the coupling process, each assembly inside the galvanic pile element is kept in a compressed state after the coupling is finished, the uniformity of the galvanic pile assembly is improved, and the service life of the galvanic pile assembly is further improved.
The electric pile packaging process disclosed by the application comprises the following steps:
a sealing plate 3 is provided on the circumferential surface parallel to the stacking direction of the electrode assemblies in the stack element 1;
under a first condition, laser is transmitted from the surface of one side of the sealing plate 3, the contact part of the sealing plate 3 and the galvanic pile element 1 is fused, the galvanic pile element 1 and the sealing plate 3 are directly coupled to obtain a galvanic pile assembly, and in the galvanic pile assembly, the side edges of a plurality of layered assemblies such as an electrode assembly and a guide plate are fused and coupled with the sealing plate 3 through the laser, so that the galvanic pile of the flow battery is sealed.
Specifically, the first condition includes:
the wavelength of the laser is 1800nm-2200 nm;
the linear energy density of the laser is 2-5.8J/mm.
Under the condition, a second pretightening force is applied to the sealing plate 3 perpendicular to the sealing plate 3, so that the sealing plate 3 and the stack element 1 are tightly attached; applying a first pre-tightening force to the stack element 1 along the bipolar plate stacking direction; and (3) fusing and coupling the contact surface between the sealing plate 3 and the electric pile element 1 under laser irradiation to obtain the electric pile assembly.
In the first condition, the contact surface between the cover plate 3 and the stack element 1 receives the energy of the laser beam and converts it into heat energy. When the coupling is completed, the gap between the cover plate 3 and the stack element 1 is filled with the molten material, and an area that is not easily distinguished by naked eyes is formed along the thickness direction of the cover plate 3.
Because under the first condition, the sealing plate 3 is locally melted in the direction of the plane in which it is located, and then cooled and solidified. The direction of the second pre-tightening force is perpendicular to the plane of the sealing plate 3, and the magnitude of the second pre-tightening force is 200-600N, and more preferably 350-600N. Under the second pretightening force, the clearance between the sealing plate 3 and the stack element 1 is not more than 0.15 mm. When the second pre-tightening force is always applied to the melting part, the thermal stress generated by the thermal expansion of the polymer melt can be effectively eliminated, and further the warping or deformation caused by the thermal expansion of the polymer melt can be effectively avoided. In addition, due to the existence of the second pre-tightening force, the internal stress generated in the solidification process of the polymer melt can be effectively eliminated by combining the local melting packaging process, the flatness of the lower sealing plate under coupling is further improved, and the sealing plate is prevented from warping.
The second pre-tightening force can be provided by an independent clamp for fixing the closing plate 3, or can be directly provided by laser welding equipment without separately arranging the clamp. The second pretightning force can make 3 laminating of shrouding at pile element 1 global, can be at the polymer melting layer that shrouding 3 and pile element 1 laminating surface formed when laser 3 passes shrouding one side, this polymer melting layer polymer molecule re-crosslinking combination under the effect of second pretightning force, the coupling layer that forms has rearranged chemical bond, because polymer molecule is re-crosslinked under pressure and laser action, the increase of the crosslinking layer chain entanglement density of formation, run through each other gradually and entangle again through the thermal diffusion effect, the tight degree of piling up of molecular chain has been increased, and chemical activity between the electrolyte is lower, when improving the mechanical properties of shrouding coupling, can improve the weatherability of shrouding 3. When the second pre-tightening force is provided by an independent clamp, the clamp is preferably a flat plate type clamp with higher flatness, the clamp is preferably a flat plate made of a material with heat conduction performance superior to that of the sealing plate 3, heat of the sealing plate can be transferred to dissipate heat in time, uniform pre-tightening force can be provided for the sealing plate 3, and therefore the sealing plate 3 can be welded under the condition of higher flatness; when the second pretightening force is directly provided by the welding equipment, the second pretightening force applies external force to the polymer melt layer to eliminate thermal stress generated by thermal expansion of the polymer melt, and on the premise that other parts of the sealing plate 3 are in full contact with the surface of the galvanic pile element 1, higher flatness can be ensured in the welding process of the sealing plate 3, so that the electrochemical performance of each component in the galvanic pile element 1 is ensured. When the part is welded, the other parts to be welded of the sealing plates 3 under the second pretightening force are fully contacted with the peripheral surface of the galvanic pile element, even if the heat expansion of the polymer melt still can ensure the flatness of the sealing plates 3 after coupling, correspondingly, the internal stress generated by the solidification of the polymer melt cannot influence the integral flatness of the sealing plates, and further the uniformity of gaps among all components in the galvanic pile element 1 is improved.
In addition, because the polymer layer has high viscosity and much poorer flowability than the metal material, the second pre-tightening force applied perpendicular to the sealing plate 3 can further form a stable cross-linked coupling layer.
In the present application, as shown in the figure, the stack element includes an ion exchange membrane 21, a carbon felt 22, a flow guiding frame 23 and an electrode assembly, the carbon felt 22, the flow guiding frame 23 and the electrode assembly are sequentially and symmetrically disposed on two sides of the ion exchange membrane 21, wherein the flow guiding frame 23 and the adjacent electrode assembly are coupled by laser melting around. The peripheral region of the lead frame 23 and the peripheral region of the electrode assembly are made of materials compatible with each other under the action of heat. The electrode assembly includes a bipolar plate 25 and a polymer frame 24 disposed at both sides of the bipolar plate 25, and the bipolar plate 25 is mixed with conductive graphite, so that the bipolar plate 25 itself has a good laser absorption performance. In the present application, the laser penetrates the frame 23 and is absorbed by the material of the bipolar plate 25, and the laser is converted into heat energy to realize coupling. The bipolar plate 25 is provided with polymer frames 24 on both sides, and the polymer frames 24 clamp the bipolar plate 25 and form an electrode assembly through laser fusion coupling. The outer edge of the polymer frame body 24 is flush with the diversion frame 23, so that the polymer frame body 24 of the present application can cover the runner area on the diversion frame 23; when electrolyte is introduced into the flow guide frame 23, the electrolyte in the flow guide frame 23 in the flow channel part is not in direct contact with the bipolar plate 25, so that the problem of carbon loss caused by oxygen corrosion of the electrolyte on the edge of the bipolar plate 25 in the flow channel can be effectively solved, the resistance rise of the bipolar plate 25 is reduced, the bipolar plate 25 on the anode side of the single cell 2 is swelled, the increase of the resistivity of the bipolar plate 25 caused by the loss of the conductive material is reduced, and the service life of the stack is prolonged.
Since the polymer frame body 24 and the lead frame 23 in the electrode assembly are fusion-coupled by laser transmission, the sealing performance in the cell is more excellent.
In addition, since the end surfaces of the bipolar plate 25 and the flow guide frame 23 are made of a material compatible with the sealing plate 3 by heat, the peripheral surface of the stack element 1 formed by stacking the unit cells 2 in this application is also compatible with the sealing plate 3 by heat.
The polymer used for the sealing plate 3, the end face of the bipolar plate 25, the end face of the flow guide frame 23 and the polymer frame body 24 can be one polymer resin or a mixture of a plurality of polymer resins. The one or more polymeric resins are preferably thermoplastic polymers. The polymer resin includes, but is not limited to, polyesters (including aromatic, semi-aromatic, and aliphatic polyesters); the liquid crystal polymer comprises a liquid crystal polyester; polyamides include aromatic, semi-aromatic, aliphatic polyamides; a polycarbonate; polyformaldehyde; a polyimide; a polybenzimidazole; polyketone; polyether ether ketone; a polyether ketone; polyether sulfone; a phenoxy resin; polystyrene; polyvinyl chloride, polyolefins (e.g., polyethylene, polypropylene, ethylene/propylene copolymers, etc.); ABS; PVDF and the like.
The polymer may also be supplemented with other additives such as glass fibers to enhance structural strength, or with additives such as antioxidants, pigments, dyes, heat stabilizers, UV light stabilizers, weathering stabilizers, mold release agents, lubricants, nucleating agents, plasticizers, antistatic agents, flame retardants, and the like. For example, to mitigate corrosion of the bipolar plate 25 by the electrolyte, the bipolar plate 25 may be supplemented with an antioxidant or the like, and the specific additional components may be selected according to the actual desired properties of the stack assembly.
The polymer material of the sealing plate 3 should have a good laser transmittance to laser, and is not limited to this embodiment, and the good laser transmittance means that the transmittance of the sealing plate 3 to a certain laser that can be used for welding is greater than or equal to 20% no matter whether the sealing plate 3 is colored, transparent or has a diffuse reflection surface, and in this application, the laser is preferably a laser with a wavelength of 1800-2200 nm. For the purposes of this application, the laser light may be transmitted through the cover plate 3 relatively optimally and absorbed at the surface in contact with the stack elements.
When a second pre-tightening force is applied to the sealing plate 3, the polymer melt generates irreversible deformation, so that coupling is realized. Therefore, in the present application, the color and transparency of the sealing plate 3 are not used as a limitation to the laser welding effect of the present application, and are not necessary factors for achieving coupling.
The first pre-tightening force is parallel to the stacking direction of elements in the galvanic pile elements, a pressure not less than 10kN is applied to the galvanic pile elements, and the first pre-tightening force is more preferably 12-20 kN. The periphery of the stack element 1 is completely coupled to the sealing plate 3 under the condition of being pressed by the first pre-tightening force, and when the first pre-tightening force is removed, the sealing plate 3 can apply a force for preventing each element in the stack element 1 from deforming and displacing. Therefore, the distribution of the gaps between the adjacent elements (such as the electrode assemblies and the adjacent flow guide frames, the ion exchange membrane and the adjacent carbon felts) is uniform, the consistency of the gap distance is high, and the gaps between the assemblies cannot be changed due to the liquid pressure of the electrolyte even when the electric pile runs with the electrolyte. For flow batteries, this small displacement is sufficient to affect the uniformity of the individual electrode elements in the stack. Therefore, after the electric pile assembly disclosed by the application is continuously operated for one year, the bipolar plate is not easy to expand and deform and is not easy to leak, the coulomb efficiency, the energy efficiency and the platform voltage attenuation of the electric pile are less than 5%, and the service life of the electric pile is further prolonged.
The application also protects a galvanic pile processed by the process in example 1, and the galvanic pile comprises galvanic pile elements 1 and sealing plates 3 arranged outside the galvanic pile elements 1, which are combined with fig. 1, fig. 2 and fig. 3. The cell stack element 1 includes an electrode assembly, a flow guide plate 23, a carbon felt 22, an ion exchange membrane 21, a carbon felt 22, and a flow guide plate 23, which are stacked in this order. The peripheral surfaces of the stack elements 1 parallel to the stacking direction of the electrode assemblies are provided with seal plates 3, and the seal plates 3 are connected end to cover the peripheral surfaces of the stack elements 1 in the stacking direction. The sealing plate 3 is configured to couple each of the electrode assemblies stacked on the circumferential surface of the stack element 1 and the side edges of the flow guide plate to the sealing plate 3 in the first condition.
In this stack embodiment, stack element 1 is coupled to cover plate 3 under a first pretension, and since cover plate 3 covers the periphery of stack element 1, stack element 1 is still stressed by cover plate 3 and the coupling area when the first pretension is removed.
The stack assembly encapsulated by the above method was tested using a VOSO containing 1.15 mol/L4At 10mA/cm2When the arithmetic mean of the voltage efficiency is 90% and the arithmetic mean of the energy efficiency is 86%, VOSO containing 1.15 mol/L is used4The electrolyte of (2) was tested under the conditions of a charge cut-off voltage of 1.5V and a discharge cut-off voltage of 0.7V, and the electric pile was tested after a certain period of continuous operation, and the following data were obtained:
Figure GDA0002501779640000091
Figure GDA0002501779640000101
conventional stack assemblies, among other things, are not provided with a seal plate or are otherwise formed into polymer melt coupling under laser conditions, and therefore do not have seal plate tensile strength test parameters. As can be seen from the above table, the encapsulation process disclosed in the present application can effectively reduce the increase in resistivity at the end faces of the bipolar plate.
After operation for a certain time, the variance of the voltage of the single cell is not more than 6mV, the variation of the coulombic efficiency is not more than 5.4%, the variation of the energy efficiency is not more than 1.8%, and compared with the traditional galvanic pile structure, the dispersion degree of the voltage of the single cell is small, which shows that the uniformity of the single cell is obviously increased, and the variation of the coulombic efficiency and the energy efficiency is far less than that of the traditional galvanic pile structure, thereby prolonging the service life of the galvanic pile.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.

Claims (8)

1. A process for packaging a stack, comprising:
sealing plates are arranged on the peripheral surfaces parallel to the stacking direction of the layered assemblies in the electric pile elements;
under a first condition, laser is transmitted through the sealing plate and absorbed by the contact surface of the sealing plate and the galvanic pile element, so that the sealing plate and the circumferential surface of the galvanic pile element are directly subjected to melt coupling to obtain a galvanic pile assembly;
at least under a first condition, the electric pile element is subjected to a first pre-tightening force along the stacking direction of the layered assembly and is kept tightly attached;
the first condition includes:
the wavelength of the laser is 1800nm-2200 nm;
the linear energy density of the laser is 2-5.8J/mm;
in the first condition, applying a second pretightening force perpendicular to the sealing plate, and under the action of the second pretightening force, attaching the sealing plate to the galvanic pile element to enable the sealing plate to be coupled to the peripheral surface of the galvanic pile element under the action of laser;
under the second pretightening force, the clearance between the sealing plate and the stack element is not more than 0.15 mm.
2. The electrical stack packaging process of claim 1, wherein the cover plate is a polymer material having an absorptivity of not less than 20% with respect to the laser light.
3. The process for encapsulating a stack according to claim 1, wherein the surface of the sealing plate facing the stack element is a non-smooth surface; or the periphery of the pile element facing the sealing plate is a non-smooth surface.
4. The electric pile packaging process according to claim 1, wherein the electric pile element comprises an ion exchange membrane, carbon felts, a flow guide frame and an electrode assembly are symmetrically arranged on two sides of the ion exchange membrane, and the flow guide frame is arranged on the side surface of the electrode assembly;
the electrode assembly is connected with the adjacent flow guide frame through fusion coupling;
the end face of the electrode assembly and the facing side of the sealing plate are both coupled to the sealing plate by laser melting under a first condition.
5. The process of claim 4, wherein the electrode assembly comprises:
a bipolar plate;
the bipolar plate is connected with the adjacent polymer frame body through fusion coupling, the polymer frame body is used for clamping and fixing the bipolar plate, and the polymer frame body is used for isolating the bipolar plate from a flow channel on the flow guide frame.
6. A stack assembly comprising stack elements and cover plates coupled to a circumferential surface parallel to a stacking direction of the stack elements, wherein the stack assembly is obtained by the stack encapsulation process according to any one of claims 1 to 5.
7. The stack assembly according to claim 6, wherein the stack element comprises an ion exchange membrane, and carbon felts, flow guide frames and electrode assemblies are symmetrically arranged on two sides of the ion exchange membrane; the electrode assembly comprises a bipolar plate and polymer frame bodies arranged on two sides of the bipolar plate, the polymer frame bodies on two sides of the bipolar plate are clamped and fixed on the bipolar plate through fusion coupling, the electrode assembly is connected with the adjacent flow guide frames through fusion coupling, and the end face of the bipolar plate and the end face of the flow guide frame are made of materials which have compatibility with the sealing plate under the action of heat.
8. The stack assembly of claim 7 wherein the electrode assembly end face and the plate facing side are each coupled to the plate by laser melting in the first condition.
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