CN118173814A - Flow battery and electric pile - Google Patents
Flow battery and electric pile Download PDFInfo
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- CN118173814A CN118173814A CN202211573807.5A CN202211573807A CN118173814A CN 118173814 A CN118173814 A CN 118173814A CN 202211573807 A CN202211573807 A CN 202211573807A CN 118173814 A CN118173814 A CN 118173814A
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- VVNATJLDMWFTTM-UHFFFAOYSA-N ethane-1,2-diamine;triethoxy(propyl)silane Chemical compound NCCN.CCC[Si](OCC)(OCC)OCC VVNATJLDMWFTTM-UHFFFAOYSA-N 0.000 claims description 2
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical compound CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 claims description 2
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- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
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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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Abstract
The invention relates to the field of liquid flow energy storage batteries in chemical energy storage technologies, in particular to an all-vanadium liquid flow energy storage battery. The invention provides a flow battery, which comprises 2 bipolar plate electrode frame integrated components A separated by a diaphragm, wherein the bipolar plate electrode frame integrated components A comprise a bipolar plate and an electrode frame with a middle through hole for placing an electrode, the bipolar plate is arranged in the middle through hole of the electrode frame and is close to an opening end of the through hole, the axis of the middle through hole is vertical to the surface of the bipolar plate, the peripheral edge of the bipolar plate is fixed with the inner wall surface of the through hole in a sealing way through laser welding, and the opening end of the through hole is sealed through the bipolar plate, and the flow battery is characterized in that: at least one lug is arranged along or in the direction parallel to the surface of the bipolar plate, the edge of the bipolar plate is far away from the bipolar plate, a through hole C or a groove is formed between the middle through hole of the electrode frame and the peripheral edge of the outer side of the electrode frame, and the lug extends to the outside of the electrode frame through the through hole C or the groove.
Description
Technical Field
The invention relates to the field of liquid flow energy storage batteries in chemical energy storage technologies, in particular to an all-vanadium liquid flow energy storage battery.
Background
The vanadium redox flow battery has the advantages that the output power and the capacity are mutually independent, and the system design is flexible; the energy efficiency is high, the service life is long, the running stability and reliability are high, and the self-discharge is low; the method has the advantages of large site selection freedom, no pollution, simple maintenance, low operation cost, high safety and the like, has wide development prospect in the aspect of large-scale energy storage, is considered to be an effective method for solving the random and intermittent unsteady characteristics of the renewable energy power generation system such as solar energy, wind energy and the like, and has great demands in renewable energy power generation and smart grid construction.
The conventional all-vanadium redox flow battery single cell structure generally comprises a battery end plate, a current collector, a bipolar plate, sealing gaskets, an electrode frame, an electrode and a diaphragm, wherein the battery 1 needs four sealing gaskets to prevent leakage of the battery, and the problem of high sealing cost is caused. Moreover, the flexibility of the gasket makes it necessary to carefully align it with the electrode frame during assembly, which is complicated and inefficient. In addition, the thickness of the sealing gasket is usually more than 0.8mm, so that the thickness of the electrode is too thick, the problem of larger internal resistance of the battery is caused, and the improvement of the power density of the battery is influenced.
In order to solve the problem, CN201911258234.5 develops an integrated electrode frame with a bipolar plate and an all-vanadium redox flow battery comprising the same, and the bipolar plate and the positive and negative electrode frames are made into a whole by laser welding, wherein one of the positive electrode frame and the negative electrode frame is a transparent electrode frame, and the other is a non-transparent electrode frame. The structure can improve the sealing reliability of the galvanic pile, reduce the use of half of sealing elements, reduce half of sealing cost, reduce the thickness of the battery, reduce the volume of the battery, improve the power density of the battery, and improve the assembly efficiency of the galvanic pile.
Despite such many advantages, the method also causes that the bipolar plate is completely wrapped by the electrode frame, and the voltage of a single cell cannot be detected from the outside, so that when a fault occurs in a pile, the fault of the pile cannot be judged, and the fault diagnosis of the pile is not facilitated.
Disclosure of Invention
Technical problem to be solved by the invention (object of the invention)
In order to solve the problem that a weldable galvanic pile detects the voltage of a single battery, the invention provides a flow battery and a galvanic pile, which can detect the voltage of the single battery in real time, facilitate qualification evaluation of the galvanic pile when leaving a factory, facilitate control of the battery during operation and timely find out abnormality of the battery, and avoid occurrence of large battery faults.
The complete technical proposal provided by the invention is that,
The invention provides a flow battery, which comprises 2 bipolar plate electrode frame integrated components A separated by a diaphragm, wherein the bipolar plate electrode frame integrated components A comprise a bipolar plate and an electrode frame with a middle through hole for placing an electrode, the bipolar plate is arranged in the middle through hole of the electrode frame and is close to an opening end of the through hole, the axis of the middle through hole is vertical to the surface of the bipolar plate, the peripheral edge of the bipolar plate is fixed with the inner wall surface of the through hole in a sealing way through laser welding, and the opening end of the through hole is sealed through the bipolar plate, and the flow battery is characterized in that: at least one lug is arranged along or in the direction parallel to the surface of the bipolar plate, the edge of the bipolar plate is far away from the bipolar plate, a through hole C or a groove is formed between the middle through hole of the electrode frame and the peripheral edge of the outer side of the electrode frame, and the lug extends to the outside of the electrode frame through the through hole C or the groove.
In the case of the battery cell in which the battery cell is formed,
The electrode is placed in the middle through hole of the electrode frame of the bipolar plate and electrode frame integrated assembly A.
The tabs of two bipolar plates in adjacent bipolar plate electrode frame integrated assembly a, separated by a membrane, leave a gap between projections on a plane parallel to the bipolar plate surfaces.
The bipolar plate is a square flat plate, the electrode frame is a square annular flat plate with a through hole in the middle, and fluid distribution flow passages are arranged on two opposite sides of the flat plate, which are far away from one side surface of the bipolar plate; the through holes C or the grooves are arranged on two opposite sides of the electrode frame without the fluid distribution flow channel.
The length of the electrode lug of the bipolar plate exposed out of the outer edge of the electrode frame is 5-15mm, and the width of the electrode lug of the bipolar plate is 5-20mm.
The tabs of adjacent bipolar plates are staggered when viewed in a direction perpendicular to the surface of the bipolar plates.
A sheet-shaped bulge is also arranged at the intersection of the outer edge of the electrode frame and the electrode lug in the bipolar plate and electrode frame integrated assembly A, the surfaces of the sheet-shaped bulge are parallel to the surface of the electrode lug part exposing the outer edge of the electrode frame, the surfaces of the sheet-shaped bulge are parallel to the surface of the electrode frame, the length and the width of the sheet-shaped bulge are the same as those of the electrode lug part exposing the outer edge of the electrode frame, the contact short circuit of the bipolar plate electrode lug of the adjacent single cell can be prevented, and the installation of a voltage acquisition line can be facilitated.
The invention also provides a flow battery pile which comprises 2 bipolar plate electrode frame integrated assemblies A and B which are respectively positioned at the left end and the right end and are sequentially stacked, wherein a diaphragm is arranged between each two adjacent bipolar plate electrode frame integrated assemblies A and B and between each two adjacent bipolar plate electrode frame integrated assemblies B.
Wherein,
The bipolar plate electrode frame integrated assembly A comprises a bipolar plate and an electrode frame with a middle through hole for placing an electrode, wherein the bipolar plate is placed in the middle through hole of the electrode frame and is close to an opening end of the through hole, the axis of the middle through hole is perpendicular to the surface of the bipolar plate, the peripheral edge of the bipolar plate is sealed and fixed with the inner wall surface of the through hole through laser welding, and the opening end of the through hole is sealed through the bipolar plate, and the bipolar plate electrode frame integrated assembly A is characterized in that: at least one lug is arranged along or in parallel with the surface of the bipolar plate in a direction of being far away from the bipolar plate, a through hole C or a groove is formed between the middle through hole of the electrode frame and the peripheral edge of the outer side of the electrode frame, and the lug penetrates through the through hole C or the groove and extends out of the electrode frame;
The bipolar plate and electrode frame integrated assembly B comprises a bipolar plate and electrode frame integrated assembly A and an electrode frame D with a middle through hole for placing an electrode, after the bipolar plate and electrode frame integrated assembly A and the electrode frame D with the middle through hole are laminated, the peripheral edges of the bipolar plate and electrode frame integrated assembly A and the electrode frame D with the middle through hole are welded and fixed into a whole through laser welding, and the electrode frame B is arranged close to the surface of one side of the electrode frame of the bipolar plate and electrode frame integrated assembly A, which is provided with a bipolar plate;
An electrode is placed in a through hole in the middle of an electrode frame of the bipolar plate and electrode frame integrated assembly A; an electrode is placed in the middle through hole of the electrode frame D;
Adjacent bipolar plate electrode frame integrated assemblies a and B separated by a diaphragm, and the tabs of two bipolar plates in adjacent bipolar plate electrode frame integrated assemblies B, leave a gap between projections on a plane parallel to the bipolar plate surfaces.
The projections of the middle through hole on the electrode frame and the projection of the electrode frame D on a plane parallel to the surface of the electrode frame of the bipolar plate and electrode frame integrated assembly A are mutually overlapped, namely, the through holes are coaxial, and the shapes and the sizes of the through holes are the same.
The bipolar plate is a square flat plate, the electrode frame is a square annular flat plate with a through hole in the middle, and fluid distribution flow passages are arranged on two opposite sides of the flat plate, which are far away from one side surface of the bipolar plate; the through holes C or the grooves are arranged on two opposite sides of the electrode frame without the fluid distribution flow channel.
The length of the electrode lug of the bipolar plate exposed out of the outer edge of the electrode frame is 5-15mm, and the width of the electrode lug of the bipolar plate is 5-20mm;
the tabs of adjacent bipolar plates are staggered when viewed in a direction perpendicular to the surface of the bipolar plates.
A sheet-shaped bulge is also arranged at the intersection of the outer edge of the electrode frame and the electrode lug in the bipolar plate and electrode frame integrated assembly A, the surfaces of the sheet-shaped bulge are parallel to the surface of the electrode lug part exposing the outer edge of the electrode frame, the surfaces of the sheet-shaped bulge are parallel to the surface of the electrode frame, the length and the width of the sheet-shaped bulge are the same as those of the electrode lug part exposing the outer edge of the electrode frame, the contact short circuit of the bipolar plate electrode lug of the adjacent single cell can be prevented, and the installation of a voltage acquisition line can be facilitated.
The electrode frame is made of transparent material and is a flat plate made of one or more than two of polyethylene, polypropylene or polyvinylidene fluoride; the laser light transmittance is 20% or more, preferably 40% or more; the thickness of the electrode frame is 1-3mm;
The conductivity of the bipolar plate is not lower than 10S/cm, the thickness is 0.3-1mm, the air permeability is lower than 1.0 x10 -4cm3/cm2 min, and the laser light transmittance is lower than 1%;
The bipolar plate is a plate made of non-transparent materials and is a carbon-plastic composite plate consisting of one or more than two of polyethylene, polypropylene or polyvinylidene fluoride, conductive carbon powder, a coupling agent and a lubricant; wherein the conductive carbon powder is one or more than two of graphite powder, expanded graphite powder, carbon black, carbon fiber powder and graphene, and the content of the conductive carbon powder is 60-75% of the mass of the bipolar plate. Preferably 65-75%;
the coupling agent is one or more than two of aminopropyl triethoxysilane, glycidol-mazoxypropyl trimethoxysilane, vinyl triethoxysilane, mercaptopropyl trimethyl (ethylene) oxysilane, ethylenediamine propyl triethoxysilane, ethylenediamine propyl methyl dimethoxy silane, titanate, aluminate, zirconate and borate, and the content of the coupling agent is 0.5-2% of the mass of the bipolar plate;
The lubricant is one or more than two of polyethylene wax, stearic acid, calcium stearate, zinc stearate, paraffin wax and vinyl bis-stearamide, and the content of the lubricant is 0.5-2% of the mass of the bipolar plate.
The technical proposal of the invention has the beneficial effects that
(1) By adopting the flow battery, as the bipolar plate and electrode frame integrated assembly is used, a sealing gasket is omitted, the thickness of an electrode can be reduced, the volume of the battery is reduced, and the volume and the weight power density of the battery are improved.
(2) By adopting the flow battery, the bipolar plate and electrode frame integrated assembly is used, so that the consumption of a sealing gasket and a bipolar plate is saved, and the cost of the battery is reduced.
(3) Compared with the prior art, the flow battery provided by the invention has the advantages that the number of assembled workpieces is reduced, the assembly process flow is simplified, and the assembly efficiency of a galvanic pile is improved due to the fact that the bipolar plate and electrode frame integrated assembly is used.
(4) Compared with the prior art, the flow battery provided by the invention has the advantages that the bipolar plate electrode frame integrated component is used, so that the voltage monitoring of a single battery of a weldable electric pile can be realized, the qualification detection of the electric pile when leaving a factory is facilitated, the voltage monitoring and the battery management when the battery operates are facilitated, the problem can be found as early as possible when the battery fails, and the solution is facilitated.
(5) Compared with the prior art, the flow battery provided by the invention has the advantages that even if the thickness of the electrode frame is reduced to be less than 2mm, the contact short circuit of the bipolar plate lugs can not occur.
Drawings
Figure 1 is a schematic diagram of a flow battery cell structure,
Wherein: a battery end plate; 2a current collector; 3, a bipolar plate electrode frame integrated assembly A;4 electrodes; 5, sealing gaskets; a separator;
Figure 2 is a schematic diagram of a flow battery stack,
Wherein: a battery end plate; 2a current collector; 3, a bipolar plate electrode frame integrated assembly A;4 electrodes; 5, sealing gaskets; a separator; 7, a bipolar plate electrode frame integrated assembly B;
Figure 3 is a schematic structural view of a bipolar plate electrode frame integrated assembly a,
Wherein: a bipolar plate C; d, an electrode frame with a groove;
Figure 4 is a schematic structural view of a bipolar plate electrode frame integrated assembly B,
Wherein: a bipolar plate C; d, an electrode frame with a groove; e electrode frame.
Detailed Description
The invention will now be described in more detail with reference to the accompanying drawings by means of specific examples.
Single cell
As shown in fig. 1, the all-vanadium redox flow battery comprises a 1 battery end plate, a 2 current collector, a 3 bipolar plate electrode frame integrated assembly a, 4 electrodes, a 5 sealing gasket and a 6 diaphragm. The bipolar plate and electrode frame integrated assembly A is formed by welding a bipolar plate C and a transparent electrode frame D through laser, and is used for connecting current collectors and electrodes at two ends of the all-vanadium redox flow battery.
The conductivity of the bipolar plate C body is 15S/cm, and the bipolar plate C body is a carbon-plastic composite plate composed of polypropylene, graphite powder, carbon black, a coupling agent and a lubricant, is made of a non-transparent material, and is cut into the shape shown in figure 3, and has the length of 85mm, the width of 65mm, the length of a lug of 20mm and the width of 10mm.
The transparent electrode frame D is made of a transparent material of polypropylene, and the light transmittance is 20%; the length, width and thickness of the transparent electrode frame are respectively 10cm, 8cm and 3mm, and the length and width of the through hole in the middle of the electrode frame are respectively 8cm and 6cm. The peripheral edges of the through holes in the middle of the transparent electrode frame are etched with annular steps with the width of 5mm, and the thickness is 0.9mm; the edge of the non-runner is provided with a groove with the width of 10mm and the depth of 0.9 mm.
As shown in fig. 3, a non-transparent bipolar plate C is placed on an annular step of a transparent electrode frame D; the peripheral edge of one side surface of the bipolar plate is attached to the annular step surface (the step surface parallel to the bipolar plate surface) and the side wall surface of the peripheral edge of the bipolar plate is attached to the side wall surface of the annular step (the step wall surface perpendicular to the bipolar plate surface); sealing and welding the peripheral edge of one side surface of the bipolar plate C and the etched annular step surface at the peripheral edge of the through hole in the middle of the electrode frame D by adopting a laser welding method, wherein the welding power is 60W, and the welding speed is 5mm/s; and (3) manufacturing the bipolar plate and electrode frame integrated assembly A consisting of a bipolar plate and an electrode frame with a through hole in the middle.
And then according to the structure shown in fig. 1, the full vanadium redox flow battery is assembled by sequentially superposing a 1 battery end plate, a 2 current collector, a 3 bipolar plate electrode frame integrated component A, a 4 electrode, a5 sealing gasket, a 6 diaphragm, a5 sealing gasket, a 4 electrode and a 3 bipolar plate electrode frame integrated component A, a 2 current collector and a 1 battery end plate. Wherein the current collector is a copper plate with the thickness of 1mm; the sealing gasket is made of fluororubber and has the thickness of 0.8mm; the electrode is made of carbon felt, and the thickness is 4.2mm; the membrane was a cation exchange membrane with a thickness of 50 μm.
And (3) carrying out charge and discharge performance test on the assembled all-vanadium redox flow battery under the condition of constant current of 120mA/cm 2, wherein the positive electrode electrolyte is 60mL of 3M H 2SO4 solution of 1.5M VO 2+, and the negative electrode electrolyte is 60mL of 3M H 2SO4 solution of 1.5M V 3+. The coulomb efficiency of the battery is 96.7%, the voltage efficiency is 90.2%, and the energy efficiency is 87.2%.
Electric pile
As shown in fig. 2, the all-vanadium redox flow battery of the invention comprises a1 battery end plate, a 2 current collector, a 3 bipolar plate electrode frame integrated component a, a 4 electrode, a 5 sealing gasket, a 6 diaphragm and a 7 bipolar plate electrode frame integrated component B. The bipolar plate and electrode frame integrated assembly A is formed by welding a bipolar plate C and a transparent electrode frame D through laser, and is used for connecting current collectors and electrodes at two ends of an all-vanadium redox flow battery stack; the bipolar plate and electrode frame integrated assembly B is formed by welding two transparent electrode frames D and a bipolar plate C clamped between the two transparent electrode frames D and the bipolar plate C through laser, and is used for connecting positive and negative electrodes inside a galvanic pile.
The bipolar plate body has conductivity of 15S/cm, is a carbon-plastic composite plate composed of polypropylene, graphite powder, carbon black, a coupling agent and a lubricant, is made of a non-transparent material, and is cut into the shape shown in figure 3, and has a length of 330mm, a width of 240mm, a lug length of 40mm and a width of 10mm.
The transparent material electrode frame D is made of a transparent material of polypropylene, and the light transmittance is 20%; the length, width and thickness of the transparent electrode frame are respectively 40cm, 30cm and 3mm, and the length and width of the through hole in the middle of the electrode frame are respectively 32.5cm and 23.5cm. The peripheral edges of the through holes in the middle of the transparent electrode frame are etched with annular steps with the width of 5mm, and the thickness is 0.8mm; the edge of the non-runner is provided with a groove with the width of 10mm and the depth of 0.9 mm.
As shown in fig. 4, the non-transparent bipolar plate C is placed on the annular step of the transparent electrode frame D; the peripheral edge of one side surface of the bipolar plate is attached to the annular step surface (the step surface parallel to the bipolar plate surface) and the side wall surface of the peripheral edge of the bipolar plate is attached to the side wall surface of the annular step (the step wall surface perpendicular to the bipolar plate surface); sealing and welding the peripheral edge of one side surface of the bipolar plate C and the etched annular step surface at the peripheral edge of the through hole in the middle of the electrode frame D by adopting a laser welding method, wherein the welding power is 60W, and the welding speed is 5mm/s; manufacturing a bipolar plate and electrode frame integrated assembly A; then, the machined integrated assembly A and another transparent electrode frame E are correspondingly overlapped, the peripheral edge of one side surface of the bipolar plate C and the etched annular step surface at the peripheral edge of the through hole in the middle of the electrode frame E are welded in a sealing mode by adopting a laser welding method, so that the positive electrode frame, the bipolar plate and the negative electrode frame are combined into a whole in a welding mode, the welding power is 60W, and the welding speed is 5mm/s; a bipolar plate and electrode frame integrated assembly B is manufactured by stacking one bipolar plate and two electrode frames with through holes in the middle.
According to the method, 2 groups of bipolar plate electrode frame integrated assemblies A and 8 groups of bipolar plate electrode frame integrated assemblies B are sequentially welded, and then according to the structure shown in fig. 2, 10 sections of all-vanadium redox flow battery are assembled by sequentially stacking 1 battery end plate, 2 current collector, 3 bipolar plate electrode frame integrated assemblies A, 4 electrodes, 5 sealing gaskets, 6 diaphragms, 5 sealing gaskets, 4 electrodes, 7 bipolar plate electrode frame integrated assemblies B, 5 sealing gaskets, 4 electrodes, 6 diaphragms, 5 sealing gaskets, 4 electrodes, 7 bipolar plate electrode frame integrated assemblies B, … … sealing gaskets, 4 electrodes, 6 diaphragms, 5 sealing gaskets, 4 electrodes, 3 bipolar plate electrode frame integrated assemblies A, 2 current collector and 1 battery end plate. Wherein the current collector is a copper plate with the thickness of 1mm; the sealing gasket is made of fluororubber and has the thickness of 0.8mm; the electrode is made of carbon felt, and the thickness is 4.2mm; the membrane was a cation exchange membrane with a thickness of 50 μm.
And (3) carrying out leakage detection on the assembled 10 all-vanadium redox flow battery packs, namely the electric pile, wherein the maximum detection pressure is 0.2MPa, and no leakage phenomenon exists. Pile performance test was performed under a constant current of 100mA/cm 2, with a positive electrolyte of 30L of 3M H 2SO4 solution of 1.5M VO 2+ and a negative electrolyte of 30L of 3MH 2SO4 solution of 1.5M V 3+. The coulomb efficiency of the electric pile is 96.7%, the voltage efficiency is 89.6%, and the energy efficiency is 86.6%. The voltage of each single cell is monitored by a voltage inspection instrument, and the difference is not more than 10mV, which indicates that the uniformity is good.
Claims (10)
1. A flow battery, characterized by: including constitute by 2 bipolar plate electrode frame integration subassemblies A of diaphragm interval, bipolar plate electrode frame integration subassembly A, including a bipolar plate C and an electrode frame D that has the middle part through-hole that is used for placing the electrode, the bipolar plate is arranged in the middle part through-hole of electrode frame, be close to an opening end department of through-hole, the axis of middle part through-hole is mutually perpendicular with the surface of bipolar plate, seal through laser welding between the edge all around of bipolar plate and the through-hole internal face is fixed, seal an opening end of through-hole through bipolar plate, its characterized in that: at least one tab is extended or arranged along the direction of the edge of the bipolar plate far away from the bipolar plate and parallel to the surface of the bipolar plate, a groove is formed between the middle through hole of the electrode frame D and the peripheral edge of the outer side of the electrode frame, and the tab extends to the outer part of the electrode frame through the groove;
An electrode is placed in a through hole in the middle of an electrode frame D of the bipolar plate and electrode frame integrated assembly A;
The tabs of two bipolar plates C in adjacent bipolar plate electrode frame integrated assembly a, separated by a membrane, leave a gap between projections on a plane parallel to the bipolar plate surfaces.
2. The flow battery of claim 1, wherein:
the bipolar plate C is a square flat plate, the electrode frame D is a square annular flat plate with a through hole in the middle, and fluid distribution flow passages are arranged on two opposite sides of the flat plate, which are far away from one side surface of the bipolar plate; the grooves are arranged on two opposite sides of the electrode frame without the fluid distribution flow channel.
3. The flow battery of claim 1, wherein:
The length of the electrode lug of the bipolar plate C exposed out of the outer edge of the electrode frame is 5-15mm, and the width of the electrode lug of the bipolar plate is 5-20mm;
the tabs of adjacent bipolar plates are staggered when viewed in a direction perpendicular to the surface of the bipolar plates.
4. The flow battery of claim 1, wherein:
A sheet-shaped bulge is also arranged at the intersection of the outer edge of the electrode frame D and the electrode lug in the bipolar plate and electrode frame integrated assembly A, the surfaces of the sheet-shaped bulge are parallel to the surface of the electrode lug part exposing the outer edge of the electrode frame, the surfaces of the sheet-shaped bulge are parallel to the surface of the electrode frame, the length and the width of the sheet-shaped bulge are the same as those of the electrode lug part exposing the outer edge of the electrode frame, the contact short circuit of the bipolar plate electrode lug of the adjacent single cell can be prevented, and the installation of a voltage acquisition line can be facilitated.
5. A flow battery stack, characterized by:
The bipolar plate electrode frame integrated assembly comprises 2 bipolar plate electrode frame integrated assemblies A and bipolar plate electrode frame integrated assemblies B which are respectively positioned at the left end and the right end and are sequentially stacked, wherein a diaphragm is arranged between each adjacent bipolar plate electrode frame integrated assembly A and each adjacent bipolar plate electrode frame integrated assembly B and between each adjacent bipolar plate electrode frame integrated assembly B;
The bipolar plate electrode frame integrated assembly A comprises a bipolar plate and an electrode frame with a middle through hole for placing an electrode, wherein the bipolar plate is placed in the middle through hole of the electrode frame and is close to an opening end of the through hole, the axis of the middle through hole is perpendicular to the surface of the bipolar plate, the peripheral edge of the bipolar plate is sealed and fixed with the inner wall surface of the through hole through laser welding, and the opening end of the through hole is sealed through the bipolar plate, and the bipolar plate electrode frame integrated assembly A is characterized in that: at least one tab is extended or arranged along the direction of the bipolar plate edge far away from the bipolar plate and parallel to the surface of the bipolar plate, a groove is formed between the middle through hole of the electrode frame and the peripheral edge of the outer side of the electrode frame, and the tab extends to the outer part of the electrode frame through the groove;
The bipolar plate and electrode frame integrated assembly B comprises a bipolar plate and electrode frame integrated assembly A and an electrode frame E with a middle through hole for placing an electrode, after the bipolar plate and electrode frame integrated assembly A and the electrode frame E with the middle through hole are laminated, the peripheral edges of the bipolar plate and electrode frame integrated assembly A and the electrode frame E with the middle through hole are welded and fixed into a whole through laser welding, and the electrode frame E is arranged close to the surface of one side of the electrode frame of the bipolar plate and electrode frame integrated assembly A, which is provided with a bipolar plate;
An electrode is placed in a through hole in the middle of an electrode frame D of the bipolar plate and electrode frame integrated assembly A; an electrode is placed in the middle through hole of the electrode frame E;
Adjacent bipolar plate electrode frame integrated assemblies a and B separated by a diaphragm, and the tabs of two bipolar plates in adjacent bipolar plate electrode frame integrated assemblies B, leave a gap between projections on a plane parallel to the bipolar plate surfaces.
6. The flow battery stack of claim 5, wherein:
The projections of the middle through hole on the electrode frame and the electrode frame E on a plane parallel to the surface of the electrode frame of the bipolar plate electrode frame integrated assembly A are mutually overlapped, namely, the through holes are coaxial, and the shapes and the sizes of the through holes are the same.
7. The flow battery stack of claim 5, wherein:
The bipolar plate C is a square flat plate, the electrode frames D and E are square annular flat plates with through holes in the middle, and fluid distribution flow passages are arranged on two opposite sides of one side surface of the flat plate, which is far away from the bipolar plate; the grooves are arranged on two opposite sides of the electrode frame D without the fluid distribution flow channel.
8. The flow battery stack of claim 5, wherein:
the length of the electrode lug of the bipolar plate exposed out of the outer edge of the electrode frame is 5-15mm, and the width of the electrode lug of the bipolar plate is 5-20mm;
the tabs of adjacent bipolar plates are staggered when viewed in a direction perpendicular to the surface of the bipolar plates.
9. The flow battery stack of claim 5, wherein:
a sheet-shaped bulge is also arranged at the intersection of the outer edge of the electrode frame and the electrode lug in the bipolar plate and electrode frame integrated assembly A, the surfaces of the sheet-shaped bulge are parallel to the surface of the electrode lug part exposing the outer edge of the electrode frame, the surfaces of the sheet-shaped bulge are parallel to the surface of the electrode frame, the length and the width of the sheet-shaped bulge are the same as those of the electrode lug part exposing the outer edge of the electrode frame, the contact short circuit of the bipolar plate electrode lug of the adjacent single cell can be prevented, and the installation of a voltage acquisition line can be facilitated.
10. The flow battery stack of claim 1 or 5, wherein: the conductivity of the bipolar plate is not lower than 10S/cm, the thickness is 0.3-1mm, and the air permeability is lower than
1.0 X10 -4cm3/cm2 min, laser light transmittance lower than 1%;
The electrode frame is made of transparent material and is a flat plate made of one or more than two of polyethylene, polypropylene or polyvinylidene fluoride; the laser light transmittance is 20% or more, preferably 40% or more; the thickness of the electrode frame is 1-3mm;
The bipolar plate is a plate made of non-transparent materials and is a carbon-plastic composite plate consisting of one or more than two of polyethylene, polypropylene or polyvinylidene fluoride, conductive carbon powder, a coupling agent and a lubricant; wherein the conductive carbon powder is one or more than two of graphite powder, expanded graphite powder, carbon black, carbon fiber powder and graphene, and the content of the conductive carbon powder is 60-75% of the mass of the bipolar plate. Preferably 65-75%;
the coupling agent is one or more than two of aminopropyl triethoxysilane, glycidol-mazoxypropyl trimethoxysilane, vinyl triethoxysilane, mercaptopropyl trimethyl (ethylene) oxysilane, ethylenediamine propyl triethoxysilane, ethylenediamine propyl methyl dimethoxy silane, titanate, aluminate, zirconate and borate, and the content of the coupling agent is 0.5-2% of the mass of the bipolar plate;
The lubricant is one or more than two of polyethylene wax, stearic acid, calcium stearate, zinc stearate, paraffin wax and vinyl bis-stearamide, and the content of the lubricant is 0.5-2% of the mass of the bipolar plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211573807.5A CN118173814A (en) | 2022-12-08 | 2022-12-08 | Flow battery and electric pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211573807.5A CN118173814A (en) | 2022-12-08 | 2022-12-08 | Flow battery and electric pile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118173814A true CN118173814A (en) | 2024-06-11 |
Family
ID=91357278
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211573807.5A Pending CN118173814A (en) | 2022-12-08 | 2022-12-08 | Flow battery and electric pile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118173814A (en) |
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2022
- 2022-12-08 CN CN202211573807.5A patent/CN118173814A/en active Pending
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