Membrane reaction unit of electrolysis electrocone
By integrating the clamping plate and bidirectional current collector electrode plate into the membrane reaction unit design, the problem of electrolyte imbalance in vanadium redox flow batteries is solved, achieving a higher operating current density and a lower cost electrolytic stack.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-26
- Publication Date
- 2026-03-24
AI Technical Summary
During the charging and discharging process, hydrogen evolution and oxygen evolution side reactions in vanadium redox flow batteries cause an imbalance in the valence state and concentration of the electrolyte, which affects the battery capacity. Existing electrolytic stacks have complex structures and low efficiency.
The functions of the clamping plate, liquid inlet end plate, pad plate and liquid flow frame are integrated into the end clamping plate and bidirectional current collecting electrode plate. Combined with the positive electrode plate, negative electrode plate and diaphragm to form a membrane reaction unit, the plate stacking size is reduced and the working area and current density of the diaphragm are increased.
Significantly reduces costs, improves electrolyte production efficiency, increases operating current density, and optimizes battery performance within the same electrolytic cell stack volume.
Smart Images
Figure CN224036367U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the all vanadium liquid flow battery technical field especially relates to a membrane reaction unit of electrolytic electric cone. BACKGROUND
[0002] Vanadium redox flow battery (referred to as vanadium battery, VRB) is a new type of high efficiency large capacity energy storage battery, long service life, high safety, has been successfully demonstrated to be applied to the power smoothing output of wind farm, future in the vast new energy field, such as wind power, photovoltaic power generation, smart grid and so on, have wide 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 the role of 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, in the process of battery charging and discharging, the positive and negative reactions will be accompanied by hydrogen evolution and oxygen evolution and other side reactions, which will lead to the imbalance of electrolyte valence state and concentration, resulting in continuous capacity attenuation of the battery, and 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 material in the form of circulating flow liquid. The initial electrolyte of the battery is sulfuric acid aqueous solution containing 3 valence and 4 valence vanadium ions (3 valence and 4 valence vanadium ion concentration is close), or sulfuric acid aqueous solution containing 3 valence and 4 valence vanadium ions as the initial electrolyte of negative electrode chamber and positive electrode chamber respectively.
[0004] See Figure 5 , 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, the working current density is 0-100mA / cm2, the single stack rated power is greater than or equal to 40kW, and the working current is 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 that the electrolysis efficiency is low under the same stack volume, and optimization is urgently needed. UTILITY MODEL CONTENTS
[0005] The utility model aims at providing a kind of membrane reaction unit of electrolytic electric cone, overcome the deficiency of prior art, by the function integration of clamping plate, liquid inlet end plate, gasket and liquid flow frame to end clamping plate and two-way current collector electrode plate, two-way current collector electrode plate and positive plate, negative plate, diaphragm combination become a membrane reaction unit, reduce the size after the sheet stacking, so that the working area of diaphragm is larger under the same electrolytic stack volume, can obtain greater working current density.
[0006] To achieve the above object, the utility model discloses the following technical scheme realizes:
[0007] A membrane reaction unit of electrolytic cell, comprising a bidirectional current collecting electrode plate, a positive plate, a negative plate and a diaphragm, the positive plate is arranged on one side of the bidirectional current collecting electrode plate, and the negative plate is arranged on the other side, the diaphragm is arranged on the outer side of the positive plate and / or the outer side of the negative plate, one electrode area for placing the electrode plate is arranged on each side surface of the bidirectional current collecting electrode plate, one liquid flow hole is arranged on each corner of the plate body, and one pressure balance hole is arranged in the electrode area of the bidirectional current collecting electrode 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, a pressure bearing table is arranged around the pressure balance hole, and an annular sealing groove is arranged on the pressure bearing table.
[0011] Further, a liquid flow guide table is arranged on the liquid flow hole, the structures of two liquid flow guide tables at the opposite diagonal positions of the same side surface are same, a through hole is arranged on the side edge of the liquid flow guide table, the through hole is communicated with the total guide groove in the electrode area, and a concentric ring groove is arranged on the surface of the liquid flow guide table.
[0012] Further, the diaphragm is arranged with an opening corresponding to the position of the liquid flow hole and the pressure balance hole.
[0013] Further, the sealing groove on the pressure bearing table, the sealing groove belt on the surface of the plate body and the concentric ring groove on the surface of the liquid flow guide table are all arranged on the two sides of the bidirectional current collecting electrode plate.
[0014] Compared with the prior art, the utility model has the beneficial effects that:
[0015] 1) by integrating the end clamp plate, the liquid inlet end plate, the pad and the liquid flow frame into the end clamp plate and the bidirectional current collecting electrode plate, the bidirectional current collecting electrode plate, the positive plate, the negative plate and the diaphragm are combined to form a membrane reaction unit, which effectively reduces the size of the stacked plates, significantly reduces the manufacturing cost of the product, and makes the product more competitive in the market.
[0016] 2) the working area of the diaphragm is larger under the same electrolytic cell volume, so that the electrolytic cell product with larger working current density is obtained, and the efficiency of the vanadium redox flow battery electrolyte production is obviously improved. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1is an embodiment of the utility model explosive structure schematic diagram;
[0018] Figure 2 is two groups of film reaction unit of embodiment of the utility model is stacked distribution schematic diagram;
[0019] Figure 3 is bidirectional current collecting electrode plate structure schematic diagram of embodiment of the utility model;
[0020] Figure 4 is Figure 3 middle along A-A line section view;
[0021] Figure 5 is prior art electrolytic pile structure schematic diagram;
[0022] In the drawing: 1-end clamping plate, 2-liquid inlet end plate, 3-pad plate, 4-current collecting plate, 5-gasket, 6-electrode, 7-liquid flow frame, 8-diaphragm, 9-high-strength bolt, 10-sealing gasket, 11-bidirectional current collecting 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-concentric ring groove. DETAILED DESCRIPTION
[0023] The technical scheme of the utility model will be described clearly and completely in combination with specific embodiments, and obviously, the described embodiments are some embodiments of the utility model, rather than all the embodiments.
[0024] In order to more clearly illustrate the specific embodiments of the utility model or the technical scheme in prior art, the specific embodiments needed to be used in the description of the specific embodiments or prior art will be simply introduced, and obviously, the specific embodiments in the following description are some embodiments of the utility model, and for those skilled in the art, other specific embodiments can also be obtained without creative labor.
[0025] The components of the embodiments of the utility model described and shown in the specific embodiments can be arranged and designed in numerous different configurations. Therefore, the following detailed description of the embodiments of the utility model provided in the specific embodiments is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model.
[0026] See Figures 1-4is an embodiment schematic diagram of a membrane reaction unit of the electrolytic cell, comprising a bidirectional current collecting electrode plate 11, a positive plate 12, a negative plate 13 and a diaphragm 14, the positive plate 12 is arranged on one side of the bidirectional current collecting electrode plate 11, and the negative plate 13 is arranged on the other side, the diaphragm 14 is arranged on the outer side of the positive plate 12 and / or the outer side of the negative plate 13, and the sealing gasket 10 is arranged between the bidirectional current collecting electrode plate 11 and the diaphragm 14; each of the two side surfaces of the bidirectional current collecting electrode plate 11 is provided with an electrode area for placing an electrode plate, each of the four corners 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 positions of the same side surface are of the same structure, which is equivalent to a symmetrical 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, and the surface of the liquid flow guide table 22 is provided with a concentric ring groove 24, so as to realize the sealing of the electrode area on the side by means of the sealing gasket 10.
[0027] The electrode area of the bidirectional current collecting electrode plate 11 is provided with a pressure balance hole 16, the pressure balance hole 16 is provided with a pressure bearing table 20 around the periphery, 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 concentric ring groove 24 on the surface of the liquid flow guide table are all located at the opposite positions of the two side surfaces of the bidirectional current collecting electrode plate 11, a plurality of membrane reaction units are sequentially stacked, and the two ends are closed by end clamping plates and connected by long bolts, so as to become a full vanadium flow battery or an electrolytic cell in the production of electrolyte.
[0028] 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, and the surface of the plate body outside the liquid flow hole 15 is provided with two sealing groove belts 19.
[0029] The positive plate 12 and the negative plate 13 are both carbon felt or graphite felt, these materials 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 beneficial to the penetration of the electrolyte and the diffusion of the ions, so as to improve 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.
[0030] The diaphragm 14 is a perfluorosulfonic acid type ion exchange membrane of the Dupont Company, which is a strong acid type ion exchange membrane, has good hydrophilicity, high membrane water content and low membrane resistance. Because the fixed ion concentration in the membrane is low, 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 a representative product of the company. The diaphragm 14 is provided with openings corresponding to the positions of the liquid flow holes 15 and the pressure balance holes 16, which does not affect the electrolyte flow when the adjacent membrane reaction units are connected.
[0031] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A membrane reaction unit of an electrolysis cell, characterized by, The application relates to a bidirectional current collecting electrode plate, a positive plate, a negative plate and a diaphragm, wherein the positive plate is arranged on one side of the bidirectional current collecting electrode plate, the negative plate is arranged on the other side of the bidirectional current collecting electrode plate, the diaphragm is arranged on the outer side of the positive plate and / or the outer side of the negative plate; one electrode area for placing the electrode plate is arranged on each side surface of the bidirectional current collecting electrode plate, one liquid flow hole is arranged at each corner of the plate body, and one pressure balance hole is arranged in the electrode area of the bidirectional current collecting electrode plate; a flow guide groove is arranged in the electrode area, the flow guide groove comprises two parallel total guide grooves and a branch guide groove connected with the two total guide grooves, and two sealing groove bands are arranged on the plate body surface outside the liquid flow hole.
2. A membrane reaction cell of an electrolysis cell according to claim 1, characterized in that The positive plate and the negative plate are carbon felt or graphite felt.
3. A membrane reaction cell of an electrolysis cell according to claim 1, characterized in that The diaphragm is a perfluorosulfonic acid type ion exchange membrane of the Dupont Company.
4. A membrane reaction cell of an electrolysis cell according to claim 1, characterized in that A pressure bearing table is arranged around the pressure balance hole, and an annular sealing groove is arranged on the pressure bearing table.
5. A membrane reaction cell of an electrolysis cell according to claim 4, characterized in that Liquid flow guide tables are respectively arranged on the liquid flow holes, the structures of two liquid flow guide tables at opposite positions on the same side surface are the same, through holes are arranged on the side edges of the liquid flow guide tables, the through holes are connected with the total guide grooves in the electrode area, and concentric ring grooves are arranged on the surfaces of the liquid flow guide tables.
6. A membrane reaction cell of an electrolysis cell according to claim 1, characterized in that Openings are respectively arranged on the diaphragm at positions corresponding to the liquid flow holes and the pressure balance hole.
7. A membrane reaction cell for an electrolysis cell according to claim 5, wherein The sealing grooves on the pressure bearing table, the sealing groove bands on the plate body surface and the concentric ring grooves on the surfaces of the liquid flow guide tables are all oppositely arranged on the two side surfaces of the bidirectional current collecting electrode plate.