Electric pile device for electrolyte production

Abstract

The utility model belongs to the technical field of all-vanadium redox flow batteries, and particularly relates to an electric pile device for electrolyte production, which is characterized by comprising end clamping plates and membrane reaction units, and a plurality of groups of membrane reaction units are stacked and arranged between the two end clamping plates and are fixedly connected through bolts. The membrane reaction unit comprises a bidirectional current collecting electrode plate, a positive electrode plate, a negative electrode plate and a diaphragm, a pressure balance hole is formed in the center in an electrode area, and a pressure bearing table is arranged on the periphery of the pressure balance hole; liquid flow guide tables are arranged on the liquid flow holes respectively, through holes are formed in the side edges of the liquid flow guide tables, and the through holes are communicated with the guide groove grooves in the electrode area; and at least any two of a positive electrode liquid inlet pipe, a positive electrode liquid outlet pipe, a negative electrode liquid inlet pipe and a negative electrode liquid outlet pipe are arranged at the positions, corresponding to the liquid flow holes, on one end clamping plate. The laminated plate has the advantages that the size of the laminated plate is effectively reduced, the manufacturing cost of the product is obviously reduced, and the production efficiency of the electrolyte of the all-vanadium redox flow battery is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the all vanadium liquid flow battery technical field especially relates to a kind of stack device for electrolyte production. BACKGROUND

[0002] Vanadium redox flow battery (referred to as vanadium battery, VRB), a new type of high-efficiency large-capacity energy storage battery, long service life, high safety, has been successfully demonstrated in wind farm power smoothing output, future in the vast new energy field, such as wind power, photovoltaic power generation, smart grid, etc., have a broad application space.In the electrolyte production of all vanadium liquid flow battery, the stack unit is the bearing device of electrolyte circulating flow in the battery.It plays a role in sealing and standardizing the flow mode of electrolyte in the battery body, and has an important influence on the charging performance of electrolyte.

[0003] In the actual application of all vanadium liquid flow battery, during the charging and discharging process of the battery, the positive and negative reactions will be accompanied by side reactions such as hydrogen evolution and oxygen evolution, which will cause the imbalance of electrolyte valence state and concentration, leading to continuous capacity attenuation of the battery, seriously affecting the normal operation of the energy storage system.The all vanadium liquid flow battery is a kind of redox battery with vanadium as active substance in circulating flow liquid state.The initial electrolyte of the battery is a sulfuric acid aqueous solution containing 3-valence and 4-valence vanadium ions (3-valence and 4-valence vanadium ion concentration is close) or a sulfuric acid aqueous solution containing 3-valence and 4-valence vanadium ions as the initial electrolyte of the negative and positive chambers respectively.

[0004] See Figure 6 The design of electrolytic stack is a pressure filter type multi-group series structure design electrolytic stack, which is assembled by clamping plate (1), liquid inlet end plate (2), gasket (3), current collector plate (4), gasket (5), electrode (6), liquid flow frame (7), diaphragm (8), high-strength bolt (9) and other materials and components in design order, working current density 0~100mA / cm2, single stack rated power ≥40kW, working current 0~660A.The structure of clamping plate (1), liquid inlet end plate (2), gasket (3) and liquid flow frame (7) makes the structure of electrolytic stack complex, and the stacking length size is too large, so the electrolysis efficiency is low under the same electrolytic stack volume, and optimization is urgently needed. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of stack device for electrolyte production, overcome the deficiency of prior art, by the clamping plate, liquid inlet end plate, gasket and liquid flow frame are integrated to end clamping plate and two-way current collector electrode plate, two-way current collector electrode plate and positive plate, negative plate, diaphragm combination becomes a membrane reaction unit, reduce the size after the sheet stacking, so that in the same electrolytic stack volume, the electrolysis effect area of diaphragm is larger, and greater current density can be obtained.

[0006] In order to achieve the above object, the utility model discloses the following technical scheme realizes:

[0007] A kind of stack device for electrolyte production, including end clamping plate and membrane reaction unit, multiple groups of membrane reaction units are arranged in stack between two end clamping plates and are fixed by multiple groups of bolts connection, the membrane reaction unit includes two-way current collecting electrode plate, positive plate, negative plate and diaphragm, one electrode area for placing electrode is arranged at the two side surfaces of two-way current collecting electrode plate, each of four corners of plate body is equipped with one liquid flow hole, flow guide groove is equipped in the electrode area, positive plate is equipped on one side of two-way current collecting electrode plate, and negative plate is equipped on the other side, diaphragm is equipped on the outer side of positive plate and / or negative plate, sealing gasket is equipped between two-way current collecting electrode plate and diaphragm;Pressure balance hole is centrally equipped in the electrode area of two-way current collecting electrode plate, pressure bearing platform is equipped around the pressure balance hole, and annular sealing groove is equipped on pressure bearing platform;Liquid flow guide platform is respectively equipped on the liquid flow hole, the structure of two liquid flow guide platforms of opposite diagonal positions on the same side surface is same, through hole is equipped on the side of liquid flow guide platform, and through hole is communicated with flow guide groove in electrode area, and annular groove is equipped on the surface of liquid flow guide platform;Any two of positive liquid flow inlet pipe, positive liquid flow outlet pipe, negative liquid flow inlet pipe and negative liquid flow outlet pipe are equipped at the position corresponding to liquid flow hole on one end clamping plate.

[0008] Further, the positive plate and the negative plate are carbon felt or graphite felt.

[0009] Further, the diaphragm is a perfluorosulfonic acid type ion exchange membrane of Dupont Company.

[0010] Further, the positive liquid flow inlet pipe, the positive liquid flow outlet pipe, the negative liquid flow inlet pipe and the negative liquid flow outlet pipe are simultaneously provided on the position corresponding to the liquid flow hole of any one of the end clamping plates.

[0011] Further, the flow guide groove includes two parallel total guide grooves and a branch guide groove connecting the two total guide grooves, and the periphery of the two-way current collecting electrode plate outside the liquid flow hole is provided with at least two rings of sealing groove belts.

[0012] Further, the diaphragm is a perfluorosulfonic acid type ion exchange membrane of Dupont Company.

[0013] Further, the sealing groove on the pressure bearing platform, the sealing groove belt on the surface of the plate body and the annular groove on the surface of the liquid flow guide platform are all located on the two sides of the two-way current collecting electrode plate.

[0014] Compared with the prior art, the utility model has the beneficial effects that:

[0015] 1) by the end of the clamping plate, liquid inlet end plate, gasket and liquid flow frame function integrated into the end of the clamping plate and two-way current collector electrode plate, two-way current collector electrode plate and positive plate, negative plate, diaphragm combination into a membrane reaction unit, very effectively reduce the size of the plate after the stack, the product manufacturing cost is significantly reduced, the product has more market competitiveness;

[0016] 2) to achieve the same electrolysis of the electrolysis of the volume, the working area of the diaphragm is larger, thereby obtaining the larger working current density of the electrolysis of the electrolysis of the product, significantly improve the efficiency of the vanadium redox flow battery electrolyte production. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is an embodiment structure schematic diagram of the electrolyte production stack device of the utility model;

[0018] Figure 2 is an embodiment of the utility model three-dimensional schematic diagram of the electrolyte production stack device;

[0019] Figure 3 is the explosion structure schematic diagram of the membrane reaction unit in the embodiment of the utility model;

[0020] Figure 4 is the structure schematic diagram of the two-way current collector electrode plate in the embodiment of the utility model;

[0021] Figure 5 is Figure 4 along the A-A line section view in the embodiment of the utility model;

[0022] Figure 6 is the structure schematic diagram of the electrolysis of the electrolysis of the prior art;

[0023] In the drawing: 1-end clamping plate, 2-liquid inlet end plate, 3-gasket, 4-current collector plate, 5-gasket, 6-electrode, 7-liquid flow frame, 8-diaphragm, 9-high strength bolt, 10-sealing gasket, 11-two-way current collector electrode plate, 12-positive plate, 13-negative plate, 14-diaphragm, 15-liquid flow hole, 16-pressure balance hole, 17-total guide groove, 18-branch guide groove, 19-sealing groove belt, 20-pressure bearing platform, 21-sealing groove, 22-liquid flow guide platform, 23-penetration hole, 24-ring groove, 25-end clamping plate, 26-membrane reaction unit, 27-bolt, 28-positive liquid flow inlet pipe, 29-positive liquid flow outlet pipe, 30-negative liquid flow inlet pipe, 31-negative liquid flow outlet pipe. DETAILED DESCRIPTION

[0024] The technical scheme of the utility model will be described below in conjunction with specific embodiments, obviously, the described embodiments are a part of the embodiments of the utility model, rather than all the embodiments.

[0025] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, specific examples required to be used in the description of the specific embodiments or the prior art will be briefly introduced as follows. Obviously, the specific examples described in the following description are some embodiments of the present application, and other embodiments can also be obtained by those skilled in the art without creative labor on the basis of these specific examples.

[0026] The components of the embodiments of the present application described and shown in the specific embodiments herein can be arranged and designed in countless different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the specific embodiments is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application.

[0027] See Figures 1-2 It is an embodiment schematic diagram of the electrolyte production stack device of the present application, comprising end clamping plates 25 and membrane reaction units 26. Multiple groups of membrane reaction units 26 are arranged in a stacked manner between the two end clamping plates 25 and are connected and fixed into one by multiple groups of bolts 27. The positive electrode liquid inflow pipe 28, the positive electrode liquid outflow pipe 29, the negative electrode liquid inflow pipe 30 and the negative electrode liquid outflow pipe 31 are all located on the same end clamping plate 25. The positive electrode liquid inflow pipe 28 and the negative electrode liquid inflow pipe 30 both enter from the lower part, and the positive electrode liquid outflow pipe 29 and the negative electrode liquid outflow pipe 31 both exit from the higher part, which can maximize the air in the flow channel and improve the uniformity of the electrolysis reaction.

[0028] See Figures 3-5 The membrane reaction unit comprises a bidirectional current collecting electrode plate 11, a positive electrode plate 12, a negative electrode plate 13 and a diaphragm 14. The positive electrode plate 12 is arranged on one side of the bidirectional current collecting electrode plate 11, and the negative electrode plate 13 is arranged on the other side. The diaphragm 14 is arranged on the outer side of the positive electrode plate 12 and the outer side of the negative electrode plate 13. The bidirectional current collecting electrode plate 11 and the diaphragm 14 are provided with a sealing gasket 10. Each side surface of the bidirectional current collecting electrode plate 11 is provided with an electrode area for placing an electrode. Each corner of the plate body is provided with a liquid flow hole 15. The liquid flow hole 15 is respectively provided with a liquid flow guide table 22. The two liquid flow guide tables 22 at the opposite diagonal positions of the same side surface are of the same structure. The side edge of the liquid flow guide table is provided with a through hole 23. The through hole 23 is connected with a total guide groove 17 in the electrode area. The surface of the liquid flow guide table 22 is provided with a ring groove 24. The electrode area is provided with a flow guide groove. The flow guide groove comprises two parallel total guide grooves 17 and a branch guide groove 18 connected with the two total guide grooves 17. The surface of the plate body outside the liquid flow hole 15 is provided with at least two sealing groove bands 19.

[0029] The electrode area of the bidirectional current collecting electrode plate 11 is centrally provided with a pressure balance hole 16, and the periphery of the pressure balance hole 16 is provided with a pressure bearing table 20, and the pressure bearing table 20 is provided with an annular sealing groove 21. The sealing groove 21 on the pressure bearing table 20, the sealing groove belt 19 on the surface of the plate body and the annular groove 24 on the surface of the liquid flow guide table all correspond to the two sides of the bidirectional current collecting electrode plate 11, and a plurality of membrane reaction units are stacked in sequence, and the two ends are closed by end clamping plates and connected by long bolts to form a full vanadium flow battery or an electrolysis cell in the production of electrolyte. After the long bolt is clamped, the sealing gasket 10 is compressed and deformed to fill the sealing groove belt 19, the sealing groove 21 and the annular groove 24, so as to realize sealing. A bolt is also installed in the pressure balance hole 16 to balance the deformation caused by the tightening of other bolts, so that the overall structure of the cell device remains stable, and the balanced clamping effect is conducive to improving the uniformity of the liquid flow in the membrane reaction unit.

[0030] The positive plate 12 and the negative plate 13 are both carbon felt or graphite felt, which have good electrical conductivity and chemical stability and can withstand the chemical reactions generated during the charging and discharging process of the battery. The porous structure of the carbon felt and the graphite felt is conducive to the penetration of the electrolyte and the diffusion of ions, thereby improving the energy conversion efficiency of the battery. In addition, these materials also have a high specific surface area, which provides more active sites for electrochemical reactions.

[0031] The separator 14 is a Nafion ion exchange membrane of DuPont Company, which is a strong acid type ion exchange membrane with good hydrophilicity. The membrane has a high water content and low membrane resistance. Due to the low concentration of fixed ions in the membrane, the repulsive force of hydrogen and oxygen ions is small, and in an acidic solution, the chemical stability is good during electrolysis. Nafion membrane is its representative product. The separator 14 is provided with openings corresponding to the liquid flow holes 15 and the pressure balance holes 16, which do not affect the sealing when connecting adjacent membrane reaction units.

[0032] The embodiment simultaneously provides the positive liquid inflow pipe 28, the positive liquid outflow pipe 29, the negative liquid inflow pipe 30 and the negative liquid outflow pipe 31 on the position corresponding to the liquid flow hole 15 on one end clamping plate 25, so that the positive electrolyte and the negative electrolyte flow under the minimum liquid resistance. At least any two of the positive liquid inflow pipe, the positive liquid outflow pipe, the negative liquid inflow pipe and the negative liquid outflow pipe can be provided on one end clamping plate 25, and the other two can be provided on the other end clamping plate 25, which can also ensure the normal flow of the electrolyte.

[0033] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A fuel cell stack device for electrolyte production, characterized in that, The device includes end clamps and membrane reaction units. Multiple membrane reaction units are stacked between two end clamps and fixed by multiple sets of bolts. Each membrane reaction unit includes a bidirectional current collector plate, a positive electrode plate, a negative electrode plate, and a diaphragm. Each side surface of the bidirectional current collector plate has an electrode area for placing an electrode. A liquid flow hole is provided at each of the four corners of the plate. A flow guiding groove is provided within the electrode area. A positive electrode plate is located on one side of the bidirectional current collector plate, and a negative electrode plate is located on the other side. A diaphragm is located outside the positive electrode plate and / or outside the negative electrode plate. A sealing gasket is provided between the bidirectional current collector plate and the diaphragm. A pressure balance hole is centrally located within the electrode area of ​​the current collector plate. A pressure bearing platform is provided around the pressure balance hole, and an annular sealing groove is provided on the pressure bearing platform. Liquid flow guide platforms are provided on the liquid flow holes respectively. Two liquid flow guide platforms at diagonal positions on the same side surface have the same structure. A through hole is provided on the side of the liquid flow guide platform, and the through hole is connected to the guide groove in the electrode area. An annular groove is provided on the surface of the liquid flow guide platform. At least two of the following are provided on one of the end clamps at the position corresponding to the liquid flow hole: positive liquid flow inlet pipe, positive liquid flow outlet pipe, negative liquid flow inlet pipe, and negative liquid flow outlet pipe.

2. The electrolyte production fuel cell stack device according to claim 1, characterized in that, Both the positive and negative electrode plates are made of carbon felt or graphite felt.

3. The electrolyte production fuel cell stack device according to claim 1, characterized in that, The diaphragm is a perfluorosulfonic acid ion exchange membrane from DuPont.

4. The electrolyte production fuel cell stack device according to claim 1, characterized in that, Each of the end clamps is provided with a positive electrode liquid inlet pipe, a positive electrode liquid outlet pipe, a negative electrode liquid inlet pipe, and a negative electrode liquid outlet pipe at the position corresponding to the liquid flow hole.

5. The electrolyte production fuel cell stack device according to claim 1, characterized in that, The flow guiding groove includes two parallel main guide grooves and a branch guide groove connecting the two main guide grooves; the bidirectional flow collecting electrode plate outside the flow hole is provided with at least two sealing grooves around its perimeter.

6. The electrolyte production fuel cell stack device according to claim 1, characterized in that, The diaphragm has openings at positions corresponding to the liquid flow holes and pressure balance holes, respectively.

7. The electrolyte production fuel cell stack device according to claim 5, characterized in that, The sealing grooves on the pressure bearing platform, the sealing grooves on the plate surface, and the annular grooves on the surface of the liquid flow guide platform are all located on both sides of the bidirectional current collecting electrode plate.

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