CN217086629U - Integrated electrode frame and bipolar plate structure for all-vanadium redox flow battery - Google Patents
Integrated electrode frame and bipolar plate structure for all-vanadium redox flow battery Download PDFInfo
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- CN217086629U CN217086629U CN202123117177.4U CN202123117177U CN217086629U CN 217086629 U CN217086629 U CN 217086629U CN 202123117177 U CN202123117177 U CN 202123117177U CN 217086629 U CN217086629 U CN 217086629U
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Abstract
The utility model discloses an electrode frame and bipolar plate structure of full vanadium redox flow battery with integration specifically is: and sealing the electrode frame and the bipolar plate by adopting a welding method to form an integrated battery frame structure. The electrode frame is made of transparent materials; the bipolar plate is a non-transparent conductive composite plate. The utility model discloses a structure can be with all vanadium redox flow battery's key parts such as electrode frame, bipolar plate constitute a whole, and a great deal of advantage can be brought to this integrated battery structure original paper: can guarantee a great deal of advantages of integrated battery structure: the galvanic pile can be assembled as an independent integrated unit, the assembly efficiency of the galvanic pile is greatly improved, the sealing reliability of the galvanic pile is greatly improved, the sealing cost is greatly reduced, the thickness of the battery is reduced, the volume of the battery is greatly reduced, and the volume energy density of the all-vanadium redox flow battery is further improved; meanwhile, the defect that the electric pile assembled by the early integrated battery structure cannot measure the voltage of a single battery can be overcome.
Description
Technical Field
The utility model relates to an all vanadium redox flow battery technical field, in particular to all vanadium redox flow battery uses integrated battery structure and preparation method.
Background
The inherent characteristics of randomness, intermittence, fluctuation, direct grid connection difficulty and the like of renewable energy sources such as wind energy, solar energy and the like limit the development and utilization of the renewable energy sources to a certain extent. Therefore, the development of energy storage technology used in cooperation with the method becomes a key.
Energy storage techniques include two broad categories, physical and chemical. The physical energy storage comprises water pumping energy storage, compressed air energy storage, flywheel energy storage and the like. The chemical energy storage mainly comprises a lead-acid battery, a sodium-sulfur battery, a flow battery, a lithium ion battery and the like. However, various energy storage technologies have suitable application fields, and chemical energy storage technologies suitable for large-scale energy storage mainly comprise flow batteries, sodium-sulfur batteries, lead-acid batteries and lithium ion batteries.
The all-vanadium redox flow battery has the advantages that the output power and the energy storage capacity can be independently designed, only one vanadium ion is contained in electrolyte ions, so that the all-vanadium redox flow battery has no phase change which is common in other batteries during charging and discharging, the battery has long service life, good charging and discharging performances, deep discharging without damaging the battery, low self-discharging, large freedom of site selection of the vanadium battery, full-automatic closed operation of a system, no pollution, simple maintenance, low operation cost, no potential explosion or fire danger of the battery system, high safety, cheap carbon materials and engineering plastics which are used as battery components, abundant material sources, easy recovery, no need of noble metal as an electrode catalyst, high energy efficiency which can reach 75-80%, high starting speed and the like, and is more concerned.
The traditional all-vanadium redox flow battery pile structure sequentially comprises a current collecting plate, a bipolar plate, a sealing gasket, an electrode frame, a sealing gasket, an electrode, a diaphragm, an electrode, a sealing gasket, an electrode frame, a sealing gasket, a bipolar plate and a current collecting plate. The diaphragm plays the roles of separating the positive electrode and the negative electrode and preventing the leakage in the battery, the sealing gasket between the components plays the role of preventing the leakage of the battery, the volume of the galvanic pile is increased by using a large amount of sealing gaskets, the volumetric specific energy of the galvanic pile is reduced, the assembly process of the galvanic pile and the risk of the leakage of the galvanic pile are increased, and the cost of the galvanic pile is increased.
The galvanic pile assembled by the early integrated structural design has the defect that the voltage of a single cell cannot be measured after the galvanic pile is assembled, and the voltage value can visually reflect the uniformity of each cell of the galvanic pile, so that the method has important significance.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model discloses guaranteeing to improve full vanadium redox flow battery sealing reliability, the volume of battery is dwindled to the thickness of attenuate battery, and then on improving full vanadium redox flow battery's volume energy density's basis, has redesigned the electrode frame and the bipolar plate structure of a new integration.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an integrated electrode frame and bipolar plate structure for an all-vanadium redox flow battery is disclosed, wherein the electrode frame is a flat plate with a through hole in the middle;
the electrode frame is made of transparent materials; the bipolar plate is a flat plate made of non-transparent materials;
a protrusion which is used as a tab extends from the edge of the bipolar plate to a direction which is far away from the bipolar plate and is parallel to the surface of the bipolar plate; an annular step is etched on the surface of one side of the electrode frame and at the peripheral edge of the opening end face of the middle through hole in the direction far away from the through hole, and a through hole A parallel to the surface of the flat plate is formed in the flat plate body between the annular step and the peripheral edge of the electrode frame; the peripheral edge of the bipolar plate is arranged on the annular step of the electrode frame, the peripheral edge of one side surface of the bipolar plate is attached to the annular step, and the tab penetrates through the through hole A and extends out of the electrode frame.
The thickness of the lug in the direction vertical to the surface of the bipolar plate is the same as that of the bipolar plate, and the material of the lug is the same as that of the bipolar plate;
the thickness of the tab is the same as or equal to the thickness of the through hole A in the direction vertical to the surface of the electrode frame, the extending direction of the edge of the bipolar plate where the tab is parallel to is the width of the tab, and the width of the tab is the same as or equal to the width of the through hole A (the direction parallel to the opening end face of the through hole).
The through hole A corresponds to the position of a polar lug of the bipolar plate, so that the polar lug of the bipolar plate can pass through the through hole A of the electrode frame when the bipolar plate is placed in the through hole of the electrode frame, and the length of the polar lug exposed out of the edge of the electrode frame is not less than 2mm, preferably 5mm-20 mm; the minimum value of the width of the bipolar plate electrode lug is 2mm, and the optimal value is 5mm-50 mm.
The composition materials at the sealed joint of the bipolar plate and the electrode frame at least contain the same substance; at least one of the same substances includes one or more of PP, PE, PS, PC, ABS, PMMA, and PET.
The opposite two sides of one side surface of the flat plate of the electrode frame are provided with fluid distribution flow channels near the edges; the other side is a plane without flow channels.
The peripheral edge of the bipolar plate is positioned on the annular step of the electrode frame, and the peripheral edge of one side surface of the bipolar plate is overlapped with the annular step.
The laser transmittance of the transparent electrode frame is more than 20%, preferably more than 40%;
the laser transmittance difference between the transparent material electrode frame and the non-transparent material bipolar plate is 15-100%, preferably 35-100%;
the non-transparent material is a combination of one or more than two of PP, PE, PS, PC, ABS, PMMA and PET and a toner, and the toner is one or more than two of black, yellow, brown and dark blue;
the transparent material is one or more than two of PP, PE, PS, PC, ABS, PMMA and PET;
the composition materials of the bipolar plate and the electrode frame at least contain the same substance, and the mass content of the same substance in the composition materials is respectively more than or equal to 10% of the respective mass, preferably more than or equal to 40% of the respective mass;
the bipolar plate is a carbon-plastic composite plate consisting of conductive carbon black and/or graphite.
The technology is prepared by the following steps:
a protrusion which is used as a tab extends from the edge of the bipolar plate to a direction which is far away from the bipolar plate and is parallel to the surface of the bipolar plate; an annular step is etched on the surface of one side of the electrode frame and at the peripheral edge of the opening end face of the middle through hole in the direction away from the through hole, and a through hole A parallel to the surface of the flat plate is formed between the annular step and the peripheral edge of the electrode frame; the peripheral edge of the bipolar plate is arranged on the annular step of the electrode frame, the peripheral edge of one side surface of the bipolar plate is attached to the annular step, and the tab passes through the through hole A and extends out of the electrode frame;
the peripheral edges of the bipolar plate are hermetically and fixedly connected to the annular steps of the electrode frame by adopting a welding method, and meanwhile, the lugs are hermetically and fixedly connected into the through holes A of the electrode frame by adopting a welding method again at the front and back surfaces of the transverse electrode frame at the through holes A of the electrode frame, so that the bipolar plate and the electrode frame are combined into a whole.
The welding mode is laser welding, and the welding power between the electrode frame and the bipolar plate is preferably 10-250W; the welding speed is 0.2-50 mm/s.
The battery frame structure is applied to an all-vanadium redox flow battery pile, and the pile is formed by connecting one or more than two monocells in series. The power of the galvanic pile is 0.5-100 kW.
The utility model has the advantages that:
1. the utility model realizes the direct welding and sealing of the bipolar plate and the electrode frame by optimizing the structure and the material of the electrode frame and the bipolar plate, and forms a two-in-one integrated battery component, and the integrated battery structure obviously improves the sealing reliability of the all-vanadium redox flow battery; the reliability of the high-power flow battery stack particularly suitable for large-scale energy storage technology is obviously improved.
2. Through the re-optimization to electrode frame and bipolar plate structure, realize using the electric pile that the integral structure assembled can the real-time measurement single battery voltage, the homogeneity of control electric pile operation guarantees the high-efficient operation of electric pile.
3. The utility model reduces the use of the sealing gasket, reduces the thickness of the battery and improves the volumetric specific energy of the battery;
4. the utilization rate of the bipolar plate is improved.
Drawings
FIGS. 1 and 2 are schematic views of a transparent material electrode frame, 1-the transparent material electrode frame; 2-step; 3-Via, 4-Via A
FIG. 3 is a schematic view of a bipolar plate, 5-bipolar plate, of non-transparent material; 6-pole ear
FIG. 4 is a structural diagram of an integrated electrode frame and bipolar plate
Detailed Description
The following examples are further illustrative of the present invention and are not intended to limit the scope of the present invention.
Example 1
The electrode frame is made of a polyethylene material with the mass content of 100 wt% and the light transmittance of 95%; the bipolar plate is a carbon-plastic composite plate with the mass content of 30-50 percent (50 percent) of polyethylene and 70-50 percent (50 percent) of graphite powder, and the light transmittance is 0.8 percent. The length, width and thickness of the electrode frame are respectively 40cm, 50cm and 4.4mm, the length, width and thickness of the bipolar plate are respectively 37cm, 46cm and 0.8mm, a lug with the width of 2cm and the length of 2.5cm is arranged at a position 22-24cm in the width direction of the bipolar plate, the thickness is 0.8mm, and the length and width of a through hole in the middle of the electrode frame are both 36cm and 45 cm. The edge all around of the through hole in the middle of the electrode frame is etched to the direction far away from the through hole to form an annular step with the width of 5mm and the thickness of 1 mm. A through hole A with the width of 2cm is etched at the position 21.5-23.5cm along the width direction of the through hole of the electrode frame, and the height (namely the thickness, which is vertical to the surface direction of the electrode frame) of the through hole is 0.8 mm. The hole takes the annular step as a plane, and the distance between the through hole A and the edges of the two sides in the thickness direction of the electrode frame is 1mm and 2.6mm respectively.
The bipolar plate is placed at the through hole of the electrode frame, the polar ear of the bipolar plate is inserted into the through hole A of the electrode frame, the welding method is adopted, the bipolar plate is welded on the annular step with the width of 5mm etched at the peripheral edge of the through hole in the middle of the electrode frame, then the polar ear of the bipolar plate is welded in the through hole A of the electrode frame, the welding power is 50W, and the welding speed is 11 mm/s; form the 'two-in-one' component of the bipolar plate electrode frame. According to the method, 10 groups of two-in-one components are welded in sequence and assembled with other battery materials (diaphragms, electrodes and the like) to form a 10-section 2-kW all-vanadium redox flow battery pile.
And (3) carrying out external leakage detection on the assembled 10-section all-vanadium redox flow battery pile, wherein the maximum internal leakage detection pressure is 0.03MPa, the external leakage detection pressure is 0.26MPa, and no gas leakage phenomenon exists. The thickness of the galvanic pile was 95mm, measured with a graduated scale. At a constant current of 100mA/cm 2 The battery performance test is carried out under the condition, the coulomb efficiency of the battery is 98.5%, the voltage efficiency is 87.9%, and the energy efficiency is 86.6%. Meanwhile, in the running process of the battery, the voltage of a single battery at a certain moment can be measured by using the externally-leaked tab, and the voltage is respectively 1.451V, 1.449V, 1.448V, 1.449V, 1.449V, 1.450V, 1.448V, 1.449V, 1.448V and 1.450V.
Example 2
The electrode frame is made of 100 wt% of polyethylene material, and the light transmittance is 90%; the bipolar plate is a carbon-plastic composite plate with the mass content of 30-50 percent (50 percent) of polyethylene and 70-50 percent (50 percent) of graphite powder, and the light transmittance is 0.5 percent. The length, width and thickness of the electrode frame are respectively 40cm, 30cm and 4.4mm, the length, width and thickness of the bipolar plate are respectively 37cm, 26cm and 0.8mm, tabs with the width of 4cm and the length of 3cm are arranged at the positions 16.5-20.5cm in the length direction of the bipolar plate, the thickness is 0.8mm, and the length and width of through holes in the middle of the electrode frame are both 36cm and 25 cm. The edge all around of the through hole in the middle of the electrode frame is etched to the direction far away from the through hole to form an annular step with the width of 5mm and the thickness of 1 mm. A through hole A with the width of 4cm is etched at the position 16-20cm along the length direction of the through hole of the electrode frame, and the height (namely the thickness, which is vertical to the surface direction of the electrode frame) of the through hole is 0.8 mm. The hole takes the annular step as a plane, and the distance between the through hole A and the edges of the two sides in the thickness direction of the electrode frame is 1mm and 2.6mm respectively.
The bipolar plate is placed at the through hole of the electrode frame, the polar ear of the bipolar plate is inserted into the through hole A of the electrode frame, the welding method is adopted, the bipolar plate is welded on the annular step with the width of 5mm etched at the peripheral edge of the through hole in the middle of the electrode frame, then the polar ear of the bipolar plate is welded in the through hole A of the electrode frame, the welding power is 50W, and the welding speed is 11 mm/s; form the 'two-in-one' component of the bipolar plate electrode frame. According to the method, 10 groups of two-in-one components are welded in sequence and assembled with other battery materials (diaphragms, electrodes and the like) to form a 10-section 2-kW all-vanadium redox flow battery pile.
And (3) carrying out external leakage detection on the assembled 10-section all-vanadium redox flow battery pile, wherein the maximum internal leakage detection pressure is 0.03MPa, the external leakage detection pressure is 0.26MPa, and no gas leakage phenomenon exists. The thickness of the galvanic pile was 95mm, measured with a graduated scale. At a constant current of 100mA/cm 2 The battery performance test is carried out under the condition, the coulomb efficiency of the battery is 98.8%, the voltage efficiency is 87.4%, and the energy efficiency is 86.4%. Meanwhile, in the running process of the battery, the voltages of the single batteries at a certain moment can be measured by using the externally-leaked tabs and are respectively 1.333V, 1.329V, 1.331V, 1.329V, 1.328V, 1.330V, 1.329V, 1.329V, 1.330V and 1.331V.
Comparative example 1
The electrode frame is made of a polyethylene material with the mass content of 100 wt% and the light transmittance of 95%; the bipolar plate is a carbon-plastic composite plate with the mass content of 30-50 percent (50 percent) of polyethylene and 70-50 percent (50 percent) of graphite powder, and the light transmittance is 0.8 percent. The length, width and thickness of the electrode frame are respectively 40cm, 50cm and 4.4mm, the length, width and thickness of the bipolar plate are respectively 37cm, 46cm and 0.8mm, the length and width of the through hole of the electrode frame are both 36cm and 45cm, annular steps with the width of 5mm are etched on the peripheral edge of the through hole in the middle of the electrode frame in the direction far away from the through hole, and the thickness of the annular steps is 1 mm.
The bipolar plate is placed at the through hole of the electrode frame, and is welded on an annular step with the width of 5mm etched at the peripheral edge of the through hole in the middle of the electrode frame by adopting a welding method, the welding power is 50W, and the welding speed is 11 mm/s; form the 'two-in-one' component of the bipolar plate electrode frame. According to the method, 10 groups of two-in-one components are welded in sequence and assembled with other battery materials (diaphragms, electrodes and the like) to form a 10-section 2-kW all-vanadium redox flow battery pile.
And (3) carrying out external leakage detection on the assembled 10-section all-vanadium redox flow battery pile, wherein the maximum internal leakage detection pressure is 0.03MPa, the external leakage detection pressure is 0.26MPa, and no gas leakage phenomenon exists. The thickness of the galvanic pile was 95mm, measured with a graduated scale. At a constant current of 100mA/cm 2 The battery performance test is carried out under the condition, and the batteryThe coulombic efficiency is 98.4%, the voltage efficiency is 87.9%, and the energy efficiency is 86.5%.
It can be seen from example 1 and comparative example 1 that the electric pile with the external leakage tabs arranged on the bipolar plate can realize real-time monitoring of single-section voltage under the same conditions, and has no influence on the tightness of the battery.
Claims (7)
1. An integrated electrode frame and bipolar plate structure for an all-vanadium redox flow battery is characterized in that the electrode frame is a flat plate with a through hole in the middle;
the electrode frame is made of transparent materials; the bipolar plate is a flat plate made of non-transparent materials;
a protrusion which is used as a tab extends from the edge of the bipolar plate to a direction which is far away from the bipolar plate and is parallel to the surface of the bipolar plate; an annular step is etched on the surface of one side of the electrode frame and at the peripheral edge of the opening end face of the middle through hole in the direction far away from the through hole, and a through hole A parallel to the surface of the flat plate is formed in the flat plate body between the annular step and the peripheral edge of the electrode frame; the peripheral edge of the bipolar plate is arranged on the annular step of the electrode frame, the peripheral edge of one side surface of the bipolar plate is attached to the annular step, and the tab penetrates through the through hole A and extends out of the electrode frame.
2. The integrated electrode frame and bipolar plate structure for the all-vanadium flow battery according to claim 1, wherein:
the thickness of the lug in the direction vertical to the surface of the bipolar plate is the same as that of the bipolar plate, and the material of the lug is the same as that of the bipolar plate;
the thickness of the pole ear is the same as the thickness of the through hole A in the direction vertical to the surface of the electrode frame, the direction of the pole ear extending parallel to the edge of the bipolar plate where the pole ear is located is the width of the pole ear, and the width of the pole ear is the same as the width of the through hole A in the direction parallel to the opening end face of the through hole.
3. The integrated electrode frame and bipolar plate structure for the all-vanadium flow battery according to claim 1, wherein:
the through hole A corresponds to the position of a polar lug of the bipolar plate, so that the polar lug of the bipolar plate can pass through the through hole A of the electrode frame when the bipolar plate is placed in the through hole of the electrode frame, and the length of the polar lug exposed out of the edge of the electrode frame is not less than 2 mm; the minimum value of the width of the bipolar plate tab is 2 mm.
4. The integrated electrode frame and bipolar plate structure for all-vanadium flow batteries according to claim 1, wherein the opposite sides of one side surface of the flat plate of the electrode frame are provided with fluid distribution flow channels near the edges; the other side is a plane without flow channels.
5. The integrated electrode frame and bipolar plate structure for all-vanadium flow batteries according to claim 1, wherein the peripheral edge of the bipolar plate is positioned on the annular step of the electrode frame, and the peripheral edge of one side surface of the bipolar plate is overlapped with the annular step.
6. The integrated electrode frame and bipolar plate structure for the all-vanadium flow battery according to claim 1, wherein:
the laser light transmittance of the transparent electrode frame is more than 20%;
the difference of the laser transmittances of the transparent material electrode frame and the non-transparent material bipolar plate is 15-100%.
7. The integrated electrode frame and bipolar plate structure for the all-vanadium flow battery according to claim 1, wherein:
the through hole A corresponds to the position of the polar ear of the bipolar plate, when the bipolar plate is placed in the through hole of the electrode frame, the polar ear of the bipolar plate can pass through the through hole A of the electrode frame, and the length of the polar ear exposed out of the edge of the electrode frame at the moment is ensured to be 5mm-20 mm; the width of the bipolar plate tab is 5mm-50 mm;
the laser light transmittance of the transparent electrode frame is more than 40%;
the laser transmittance difference between the transparent electrode frame and the non-transparent bipolar plate is 35-100%.
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| CN202123117177.4U CN217086629U (en) | 2021-12-07 | 2021-12-07 | Integrated electrode frame and bipolar plate structure for all-vanadium redox flow battery |
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