Flow battery guide plate for reducing electrolyte concentration difference

Abstract

The utility model discloses a flow battery guide plate for reducing electrolyte concentration difference, which comprises a body, the body is in a rectangular plate shape, and a positive electrode liquid inlet hole and a negative electrode liquid inlet hole which are used for feeding liquid and a positive electrode liquid outlet hole and a negative electrode liquid outlet hole which are used for discharging liquid are respectively arranged on two sides of a long edge of the body; a reaction chamber is arranged in the middle of the body, and two sides of the reaction chamber are respectively communicated with the positive electrode liquid outlet hole and the positive electrode liquid inlet hole through two diversion trenches; the diversion trench is communicated with the liquid storage tank, bosses are arranged between the liquid storage tank and the reaction chamber, and a permeation channel capable of allowing electrolyte to circulate is reserved between every two adjacent bosses; a flow guide block is arranged in the flow guide groove. The guide plate is provided with the liquid storage tank and the boss, so that the electrolyte can enter the reaction chamber from a plurality of parts at the same time, and the distance between the liquid inlet and the liquid outlet is reduced, so that the problems that the concentration difference of the electrolyte is increased and the local temperature of the battery is too high are avoided, and the service life of the battery is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid flow batteries, in particular to a liquid flow battery guide plate for reducing electrolyte concentration differences. Background Art

[0002] Liquid flow battery is a new type of electrochemical energy storage system that can be used for charging and discharging of wind power generation and photovoltaic power generation. It has broad application prospects in power grid peak shaving and valley filling, smart grid construction, etc. Liquid flow battery consists of positive electrode storage tank, negative electrode storage tank, electric pump, porous electrode and guide plate. Positive and negative electrolytes are stored in the positive and negative electrode storage tanks respectively. The electrolyte flows into the corresponding flow channel through the pressurization of the pump. The hydrogen ions pass through the ion exchange membrane and undergo redox reaction in the frame, and finally flow back to the corresponding storage tank to complete a charging and discharging process. The guide plate is the only way for the electrolyte to be introduced from the storage tank to the porous electrode. The quality of the guide plate directly affects the efficiency of charging and discharging and the service life of the battery.

[0003] The liquid inlet and outlet of the existing guide plate are far apart, and during the charging and discharging process, the electrolyte ion concentration difference in each part becomes larger, thereby increasing the polarization resistance, causing local overtemperature and even burning. Secondly, the long distance between the liquid inlet and outlet causes the ions to produce greater flow resistance, affecting the flow rate of the electrolyte in the battery stack, causing different degrees of concentration polarization, and shortening the battery life. Utility Model Content

[0004] Based on the above problems, the utility model provides a flow battery guide plate for reducing electrolyte concentration differences.

[0005] A flow battery guide plate for reducing electrolyte concentration difference, comprising a main body, the main body is in the shape of a rectangular plate, and the two sides of the long side of the main body are respectively provided with a positive electrode liquid inlet hole and a negative electrode liquid inlet hole for liquid inlet and a positive electrode liquid outlet hole and a negative electrode liquid outlet hole for liquid discharge;

[0006] The middle part of the body is a reaction chamber, and the two sides of the reaction chamber are connected to the positive electrode liquid outlet and the positive electrode liquid inlet respectively through two guide grooves;

[0007] The guide groove is connected to the liquid storage tank, a boss is arranged between the liquid storage tank and the reaction chamber, and a permeation channel through which electrolyte can flow is reserved between adjacent bosses;

[0008] A guide block is arranged in the guide groove.

[0009] The beneficial effects of adopting the above technical solution are as follows: the guide plate of the utility model is provided with a liquid storage tank and a boss outside the reaction chamber, and an infiltration channel for electrolyte flow is formed between the bosses. The electrolyte can enter the reaction chamber from different infiltration channels at the same time, avoiding the problem of a large difference in electrolyte ion concentration in different parts of the reaction chamber, while also reducing the migration distance of ions and improving the reaction efficiency; in addition, a guide block is provided in the guide groove, and the electrolyte can be quickly and evenly filled in the liquid storage tank through the guide block, thereby achieving a good guide effect.

[0010] Furthermore, the main body is provided with an installation mark for indicating the assembly direction, and the installation mark is a convex dot.

[0011] The beneficial effect of adopting the above technical solution is that by setting the installation mark, it is possible to avoid installing the guide plate upside down when assembling and packaging the battery.

[0012] Furthermore, the guide groove is connected to the middle part of the liquid storage tank.

[0013] The beneficial effect of adopting the above technical solution is that the guide groove is arranged in the middle of the liquid storage tank, so that the electrolyte can be delivered to both ends of the liquid storage tank at the same time, thereby reducing the overflow time of the electrolyte.

[0014] Furthermore, the guide blocks in the guide groove include a plurality of guide blocks for evenly distributing the electrolyte to both sides of the liquid storage tank.

[0015] Furthermore, the cross-sectional shape of the guide groove is any one of rectangular, semicircular and U-shaped.

[0016] Furthermore, the width of the above-mentioned permeation channel is not greater than 10 mm.

[0017] The utility model has the following beneficial effects: the guide plate of the utility model is provided with a liquid storage tank and a boss, so that the electrolyte can enter the reaction chamber at multiple locations at the same time, and the distance between the liquid inlet and the liquid outlet is reduced, thereby avoiding a large difference in electrolyte concentration and avoiding the problem of excessively high local temperature of the battery, and is also beneficial to increasing the service life of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a top view of the guide plate of the utility model;

[0019] Figure 2 It is a three-dimensional diagram of the guide plate of the utility model;

[0020] Figure 3 for Figure 1 A partial enlarged view of the middle part;

[0021] Figure 4 for Figure 1 A partial enlarged view of point B in the middle;

[0022] Figure 5 This is a schematic diagram of the guide plate structure of the second embodiment of the utility model.

[0023] In the figure: 10-main body; 101-reaction chamber; 102-guiding groove; 103-guiding block; 104-liquid storage tank; 105-boss; 106-positive electrode liquid inlet hole; 107-positive electrode liquid outlet hole; 108-negative electrode liquid inlet hole; 109-negative electrode liquid outlet hole; 201-installation mark. DETAILED DESCRIPTION

[0024] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0025] Embodiment 1

[0026] refer to Figure 1 and Figure 2 The utility model provides a flow battery guide plate for reducing electrolyte concentration difference, including a guide plate body 10, wherein the body 10 is a rectangular plate structure, and a positive electrode liquid inlet hole 106 and a negative electrode liquid inlet hole 108 for liquid inlet and a positive electrode liquid outlet hole 107 and a negative electrode liquid outlet hole 109 for liquid discharge are respectively arranged on both sides of its long sides, the positive electrode liquid inlet hole 106 is opposite to the positive electrode liquid outlet hole 107, and the negative electrode liquid inlet hole 108 is opposite to the negative electrode liquid outlet hole 109.

[0027] The middle of the body 10 is a rectangular groove, which serves as a reaction chamber 101 for the positive and negative electrolytes. The depth of the groove is the same everywhere, and the bottom of the groove is flat and smooth. The two sides of the reaction chamber 101 are connected to the positive electrode liquid outlet 107 and the positive electrode liquid inlet 106 respectively through two guide grooves 102.

[0028] The guide groove 102 is connected to the liquid storage tank 104 . The guide groove 102 is connected to the middle of the liquid storage tank 104 . The liquid storage tank 104 is arranged along the long side of the reaction chamber 101 .

[0029] Arranged bosses 105 are arranged on the outside of both sides of the long side of the reaction chamber 101. Adjacent bosses 105 are arranged intermittently, and the gaps between them constitute an infiltration channel. The electrolyte can flow into the reaction chamber 101 through the infiltration channel. The width of the infiltration channel is generally not more than 10 mm; the height of the infiltration channel is higher than the bottom wall of the liquid storage tank 104 and lower than the top of the boss 105, and the height of the infiltration channel is consistent. When the electrolyte is injected into the reaction chamber 101 through the guide groove 102, the electrolyte is first stored in the liquid storage tank 104 to a certain height, and only when the liquid level is higher than the infiltration channel will it enter the reaction chamber 101, ensuring that the electrolyte at different infiltration channels enters the reaction chamber 101 at the same time, preventing the electrolyte ion concentration from being uneven at different parts of the reaction chamber 101. At the same time, the setting of multiple infiltration channels can enable the electrolyte to enter different parts of the reaction chamber 101 at the same time to react, avoiding the problem of large electrolyte flow resistance and increased polarization resistance caused by the long distance between the inlet and outlet.

[0030] A guide block 103 is provided in the guide groove 102 for diverting the injected or discharged electrolyte so that the electrolyte can be quickly and evenly distributed throughout the liquid storage tank 104. The cross-sectional shape of the guide groove 102 is any one of a rectangular, semicircular, and U-shaped.

[0031] The guide block 103 in the guide groove 102 includes a plurality of strips for evenly distributing the electrolyte to the two sides of the liquid storage tank 104 .

[0032] An installation mark 201 is provided on the body 10 of the guide plate to indicate the assembly direction and avoid reverse assembly during assembly. The installation mark 201 is a hemispherical outward convex point.

[0033] The following is an explanation using a guide plate with actual parameters:

[0034] refer to Figure 3 and Figure 4 The body 10 of the guide plate is 513mm wide and 2.85mm thick. The upper and lower surfaces of the body 10 are smooth and oil-free. The flatness of the upper and lower surfaces is within 0.05mm. There should be no impurities and air bubbles inside the body 10, and there should be no burrs or scratches on the edges. There should be no bending as a whole, the size should remain stable, and the finished product should eliminate residual stress.

[0035] The apertures of the positive electrode liquid inlet hole 106, the positive electrode liquid outlet hole 107, the negative electrode liquid inlet hole 108, and the negative electrode liquid outlet hole 109 are all 40 mm; the center distance between the positive electrode liquid inlet hole 106 and the positive electrode liquid outlet hole 107 is 438 mm, and the center distance between the negative electrode liquid inlet hole 108 and the positive electrode liquid inlet hole 106 is 608 mm.

[0036] The depth of the guide groove 102 is 1.85 mm, the distance from the outer wall of the guide groove 102 to the edge of the body 10 is 17.5 mm, the width of the straight section of the guide groove 102 is 30 mm, and three guide blocks 103 are arranged inside. The guide block on the outer side of the liquid inlet side is curved at the intersection with the liquid storage tank 104, and the arc radius is 14.5 mm, the arc radius near the outer arc is 22 mm, the arc radius of the innermost guide block at the bend is 6 mm, and the arc radius of the guide block in the middle is 18 mm and 22.5 mm.

[0037] The distance from the inner wall of the boss 105 to the edge of the main body 10 is 81.5 mm, wherein the width of the boss 105 is 5 mm, and the distance from the outer wall of the boss 105 to the outer wall of the liquid storage tank 104 is 12 mm; the width of the permeation channel between adjacent bosses 105 is 10 mm; the distance between the inner walls of the boss 105 on the liquid inlet side and the liquid outlet side is 350 mm.

[0038] The length of the boss 105 in the middle of the liquid inlet side is 62.7 mm, the length of the boss 105 close to the guide block 103 is 61.4 mm, the length of the boss 105 close to the outermost edge is 60.2 mm, and the distance between the boss 105 and the inner wall of the reaction chamber 101 is 7.5 mm; the length of the boss 105 in the middle of the liquid outlet side is 62.7 mm, and the length of the boss 105 close to the guide block 103 is 60.2 mm.

[0039] The installation mark 201 is a semi-spherical convex point protruding outward, with a spherical radius of 3 mm and a distance of 37.5 mm from the outer edge.

[0040] It should be noted that when the positive electrode liquid inlet hole 106 is used to inject the positive electrolyte, the negative electrode liquid inlet hole 108 is used to inject the negative electrolyte.

[0041] Embodiment 2

[0042] refer to Figure 5 In order to increase the flow of liquid inlet and outlet, the length of the guide groove 102 is lengthened, and the other parameters are the same as those in the first embodiment.

[0043] The guide plate of the utility model can be applied to all-vanadium liquid flow batteries, zinc-bromine liquid flow batteries and other liquid flow batteries.

[0044] The above is only a preferred embodiment of the utility model, which does not represent all possible forms of the utility model, and the protection scope of the utility model is not limited to such special statements and embodiments. According to the technical inspirations disclosed by the utility model, various other modifications and improvements that do not deviate from the essence of the utility model are made, and these modifications and improvements are still within the protection scope of the utility model.

Claims

1. A flow battery guide plate for reducing electrolyte concentration difference, comprising a body (10), characterized in that: The body (10) is in the shape of a rectangular plate, and is provided with a positive electrode liquid inlet hole (106) and a negative electrode liquid inlet hole (108) for liquid inlet, and a positive electrode liquid outlet hole (107) and a negative electrode liquid outlet hole (109) for liquid discharge, respectively, on both sides of its long sides; The middle part of the body (10) is a reaction chamber (101), and two sides of the reaction chamber (101) are respectively connected to the positive electrode liquid outlet (107) and the positive electrode liquid inlet (106) through two guide grooves (102); The guide groove (102) is connected to the liquid storage tank (104), a boss (105) is arranged between the liquid storage tank (104) and the reaction chamber (101), and a permeation channel through which electrolyte can flow is reserved between adjacent bosses (105); A guide block (103) is provided in the guide groove (102).

2. The flow battery guide plate for reducing electrolyte concentration difference according to claim 1, characterized in that: The main body (10) is provided with an installation mark (201) for indicating the assembly direction, and the installation mark (201) is a convex point.

3. The flow battery guide plate for reducing electrolyte concentration difference according to claim 1, characterized in that: The guide groove (102) is connected to the middle part of the liquid storage tank (104).

4. The flow battery guide plate for reducing electrolyte concentration difference according to claim 1, characterized in that: The guide block (103) in the guide groove (102) comprises a plurality of strips, and is used to evenly distribute the electrolyte to both sides of the liquid storage tank (104).

5. The flow battery guide plate for reducing electrolyte concentration difference according to claim 1, characterized in that: The cross-sectional shape of the guide groove (102) is any one of a rectangular shape, a semicircular shape and a U shape.

6. The flow battery guide plate for reducing electrolyte concentration difference according to any one of claims 1 to 5, characterized in that: The width of the permeation channel is no more than 10 mm.

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