Flow battery stack liquid path partitioning system

Abstract

The utility model relates to the field of vanadium redox flow batteries, in particular to a redox flow battery galvanic pile liquid path partitioning system which comprises a pipeline system, the pipeline system comprises a plurality of gaskets and a plurality of liquid conveying pipes penetrating through the gaskets, liquid conveying holes communicated with galvanic pile partitions are formed in the liquid conveying pipes, and each liquid conveying pipe penetrates through all the gaskets. The distance between the liquid inlet of the infusion tube and the infusion hole is larger than the distance between the two farthest gaskets. By adopting the technical scheme, electrolyte enters the liquid conveying pipe through the liquid inlet of the liquid conveying pipe, enters the galvanic pile through the liquid conveying hole, reacts in the galvanic pile and then flows back to the liquid storage tank through the liquid conveying hole of the other liquid conveying pipe to complete circulation, the length of a circulation path of the electrolyte is lengthened through the liquid conveying pipe, the resistance of the circulation system is increased, and the circulation efficiency is improved. And the leakage current is reduced.

Description

Technical Field

[0001] The present application relates to the field of vanadium liquid flow batteries, and in particular to a liquid flow battery stack liquid path partitioning system. Background Art

[0002] All-vanadium liquid flow battery is a redox battery with vanadium as active material in a circulating liquid state. The electric energy of vanadium battery is stored in the form of chemical energy in sulfuric acid electrolyte of vanadium ions of different valence states. The electrolyte is pressed into the battery stack by an external pump. Under the action of mechanical power, it circulates in the closed loop of different liquid storage tanks and half-cells. Proton exchange membrane is used as the separator of the battery pack. The electrolyte solution flows parallel to the electrode surface and electrochemical reaction occurs. The current is collected and conducted through the double electrode plates, so that the chemical energy stored in the solution is converted into electrical energy.

[0003] The invention patent with publication number CN115051011B discloses a liquid flow battery stack liquid path partitioning system, which includes a stack, and the stack includes at least one stack partition and end plates on both sides. The four corners of the sub-stack and the end plate are respectively provided with four main inlets and outlets, and an equalizing pipe is provided in the main inlet and outlet, and a plurality of sub-cavities are provided inside the equalizing pipe. Each sub-cavity is provided with an opening connected to the sub-stack, so as to supply liquid to the sub-stack.

[0004] With respect to the above-mentioned related technologies, the circulation paths between the battery cells in each partition of the battery stack are short, the resistance is small, and the leakage current in the battery stack is large, resulting in low efficiency of the battery stack. Utility Model Content

[0005] In order to reduce leakage current and loss, the present application provides a liquid flow battery stack liquid path partitioning system, which adopts the following technical solutions:

[0006] A liquid flow battery stack liquid path partitioning system includes a stack, the stack includes at least one stack partition and end plates on both sides of the stack, four main inlets and outlets are respectively provided at the four corners of the stack and the end plates, the liquid flow directions of the four main inlets and outlets are respectively positive electrode out, negative electrode out, positive electrode in, and negative electrode in clockwise, and it is characterized in that: a pipeline system is provided in the main inlets and outlets, the pipeline system includes a plurality of gaskets, and a plurality of infusion tubes passing through the gaskets, the infusion tubes are provided with infusion holes connected to the stack partitions, each infusion tube is passed through all gaskets, and the distance from the liquid inlet of the infusion tube to the infusion hole is greater than the distance between the two farthest gaskets.

[0007] By adopting the above technical solution, the electrolyte enters the infusion tube through the inlet of the infusion tube, enters the fuel cell stack through the infusion hole for reaction, and then flows back to the storage tank through the infusion hole of another infusion tube to complete the cycle. The infusion tube lengthens the circulation path length of the electrolyte, reduces leakage current, reduces losses, and improves the efficiency of the fuel cell stack.

[0008] Optionally, the same infusion tube passes through the same gasket at least twice.

[0009] By adopting the above technical solution, the length of the electrolyte circulation path can be effectively increased.

[0010] Optionally, the gasket is circular, and the intersection of the infusion tube and the gasket is far away from the center of the gasket.

[0011] By adopting the above technical solution, the length of the infusion tube at the turning point becomes longer, which can effectively increase the length of the electrolyte circulation path.

[0012] Optionally, the distance from the intersection of the infusion tube and the gasket to the center of the circle is greater than two-thirds of the radius of the gasket.

[0013] By adopting the above technical solution, the length of the infusion tube at the turning point becomes longer, which can effectively increase the length of the electrolyte circulation path.

[0014] Optionally, at least two avoidance holes for passing an infusion tube are formed on the gasket, and the avoidance holes are evenly distributed in the circumferential direction of the gasket.

[0015] By adopting the above technical solution and in a uniformly distributed manner, the length of the infusion tube at the bend becomes longer, which can effectively increase the length of the electrolyte circulation path.

[0016] Optionally, the same infusion tube located between the two gaskets is parallel to each other.

[0017] By adopting the above technical solution, it is relatively simple and convenient to assemble the infusion tube onto the gasket.

[0018] Optionally, the same infusion tube located between two gaskets crosses each other.

[0019] By adopting the above technical solution, the length of the infusion tube can be effectively increased, and the length of the electrolyte circulation path can be effectively increased.

[0020] Optionally, a sealing ring is provided in the avoidance hole.

[0021] By adopting the above technical solution, relative sliding occurs between the infusion tube and the gasket, resulting in displacement of the position of the infusion hole.

[0022] Optionally, the sealing ring is annular, an annular protrusion is arranged on the outer side of the sealing ring, and a limiting groove for embedding the protrusion is opened on the inner wall of the avoidance hole.

[0023] By adopting the above technical solution, the sealing ring is prevented from falling off from the avoidance hole.

[0024] Optionally, the infusion hole is located at the end of the infusion tube.

[0025] By adopting the above technical solution, the flow distance of the electrolyte in the infusion tube is effectively increased when the length of the infusion tube remains the same.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. The electrolyte enters the infusion tube through the inlet of the infusion tube, enters the battery stack through the infusion hole for reaction, and then flows back to the storage tank through the infusion hole of another infusion tube to complete the cycle. The infusion tube lengthens the circulation path length of the electrolyte, reduces leakage current, reduces losses, and improves the efficiency of the battery stack;

[0028] 2. A sealing ring is provided in the avoidance hole to prevent the infusion hole from shifting;

[0029] 3. An annular protrusion is arranged on the outer side of the sealing ring, and the annular protrusion is embedded in the limiting groove to prevent the sealing ring from falling off from the avoidance hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the pipeline system of Example 1 of the present application.

[0031] Figure 2 It is a partial structural schematic diagram of the pipeline system of Example 1 of the present application.

[0032] Figure 3 It is a schematic diagram of the overall structure of the gasket of Example 1 of the present application.

[0033] Figure 4 yes Figure 3 A partial enlarged view of part A.

[0034] Figure 5 It is a schematic diagram of the overall structure of the pipeline system of Example 2 of the present application.

[0035] Figure 6 It is a schematic diagram of the overall structure of the pipeline system of Example 3 of the present application.

[0036] Explanation of the reference numerals: 1. gasket; 11. avoidance hole; 111. limiting groove; 2. infusion tube; 21. infusion hole; 3. sealing ring; 31. protrusion. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1-6 This application is described in further detail.

[0038] Embodiments 1-3 of the present application disclose a liquid flow battery stack liquid path partitioning system. Example 1

[0039] A liquid flow battery stack liquid path partitioning system includes a stack, which includes 5 stack partitions and end plates on both sides of the stack. Four main inlets and outlets are respectively provided at the four corners of the stack end plates. The liquid flow directions of the four main inlets and outlets are positive electrode out, negative electrode out, positive electrode in, and negative electrode in, respectively, in a clockwise direction.

[0040] refer to Figure 1 , Figure 2 The four main inlets and outlets are provided with a pipeline system, which includes five gaskets 1 and four infusion tubes 2 passing through the gaskets 1 (in order to facilitate the demonstration of the principle, only one infusion tube 2 is shown in the figure). Each infusion tube 2 is provided with an infusion hole 21 connected to the battery stack partition, and each infusion tube 2 is passed through five gaskets 1.

[0041] refer to Figure 3 The gasket 1 is an elastic rubber disc, and two circular avoidance holes 11 are opened on the gasket 1. The line connecting the centers of the two avoidance holes 11 coincides with the diameter of the gasket 1. The two avoidance holes 11 are symmetrical about the center of the gasket 1, and the distance between the avoidance holes 11 and the center is greater than two-thirds of the radius of the gasket 1.

[0042] refer to Figure 3 , Figure 4 The inner wall of the avoidance hole 11 is provided with an annular limiting groove 111, and the center of the limiting groove 111 coincides with the center of the avoiding hole 11. An annular sealing ring 3 is sleeved on the infusion tube 2, and the sealing ring 3 is made of elastic rubber material. An annular protrusion 31 is provided on the side wall of the sealing ring 3 away from the infusion tube 2, and the center of the annular protrusion 31 coincides with the center of the sealing ring 3. The protrusion 31 is embedded in the limiting groove 111 and has an interference fit with the limiting groove 111.

[0043] refer to Figure 1 , the flow direction of the electrolyte is shown by the arrow. The end of the infusion tube 2 where the electrolyte starts to flow is the inlet. The infusion tube 2 first passes through the avoidance hole 11 and passes through five gaskets 1 in sequence. Then the infusion tube 2 turns back in a serpentine shape and passes through another avoidance hole 11 of the gasket 1 away from the inlet. The end of the infusion tube 2 away from the inlet is the end of the infusion tube 2, and the end of the infusion tube 2 is in a closed state. The infusion hole 21 is opened at the end of the infusion tube 2. After the infusion tube 2 is bent once, the two horizontal sections are parallel to each other except the bent part. Example 2

[0044] refer to Figure 5The difference between Example 2 and Example 1 is that the length of the infusion tube 2 is longer than that of the infusion tube 2 in Example 1, and four avoidance holes 11 are opened on each gasket 1. The four avoidance holes 11 are distributed on concentric circles coinciding with the center of the gasket 1, and two avoidance holes 11 symmetrical about the center of the gasket 1 form a group. The two avoidance holes 11 in the same group are distributed on the diameter of the gasket 1, and the distance between the two avoidance holes 11 in each group is greater than two-thirds of the diameter.

[0045] refer to Figure 5 The flow path of the electrolyte is shown by the arrow in the figure. Compared with Example 1, the gasket 1 on the right is removed in Example 2, and the infusion tube 2 snakes through the four avoidance holes 11 in the other four gaskets 1. The infusion tubes 2 between two adjacent gaskets 1 are parallel to each other. Example 3

[0046] refer to Figure 6 The difference between Example 3 and Example 1 is that the infusion tube 2 in Example 3 is longer, and the way the infusion tube 2 is inserted into the gasket is different. The flow pattern of the electrolyte is shown in the direction of the arrow in the figure. Between two adjacent gaskets 1, the two sections of the infusion tube 2 that transport the electrolyte in opposite directions cross each other in space but do not interfere with each other.

[0047] In order to lengthen the infusion tube, the infusion tube between two adjacent gaskets in Examples 1-3 may be rolled up, wound up, etc. in addition to being stretched.

[0048] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A liquid flow battery stack liquid path partitioning system, characterized in that: The invention comprises a battery stack, wherein the battery stack comprises at least one battery stack partition and end plates on both sides of the battery stack, wherein four main inlets and outlets are respectively provided at four corners of the battery stack and the end plates, and the liquid flow directions of the four main inlets and outlets are respectively positive electrode outlet, negative electrode outlet, positive electrode inlet and negative electrode inlet in clockwise order, and the invention is characterized in that: a pipeline system is provided in the main inlets and outlets, wherein the pipeline system comprises a plurality of gaskets (1) and a plurality of infusion pipes (2) passing through the gaskets (1), wherein an infusion hole (21) connected to the battery stack partition is provided on the infusion pipe (2), and each infusion pipe (2) passes through all gaskets (1), and the distance from the liquid inlet of the infusion pipe (2) to the infusion hole (21) is greater than the distance between the two farthest gaskets (1).

2. The liquid flow battery stack liquid path partitioning system according to claim 1, characterized in that: The same infusion tube (2) passes through the same gasket (1) at least twice.

3. The liquid flow battery stack liquid path partitioning system according to claim 2, characterized in that: The gasket (1) is circular, and the intersection point between the infusion tube (2) and the gasket (1) is far away from the center of the gasket (1).

4. The liquid flow battery stack liquid path partitioning system according to claim 3, characterized in that: The distance from the intersection of the infusion tube (2) and the gasket (1) to the center of the circle is greater than two-thirds of the radius of the gasket (1).

5. The liquid flow battery stack liquid path partitioning system according to claim 4, characterized in that: At least two avoidance holes (11) for passing the infusion tube (2) are provided on the gasket (1), and the avoidance holes (11) are evenly distributed in the circumferential direction of the gasket (1).

6. The liquid flow battery stack liquid path partitioning system according to claim 5, characterized in that: The same infusion tube (2) located between the two gaskets (1) is parallel to each other.

7. The liquid flow battery stack liquid path partitioning system according to claim 5, characterized in that: The same infusion tube (2) located between the two gaskets (1) crosses each other.

8. The liquid flow battery stack liquid path partitioning system according to any one of claims 5 to 7, characterized in that: A sealing ring (3) is arranged in the avoidance hole (11).

9. The liquid flow battery stack liquid path partitioning system according to claim 8, characterized in that: The sealing ring (3) is annular, an annular protrusion is arranged on the outside of the sealing ring (3), and a limiting groove (111) for embedding the protrusion (31) is opened on the inner wall of the avoidance hole (11).

10. The liquid flow battery stack liquid path partitioning system according to claim 9, characterized in that: The infusion hole (21) is located at the end of the infusion tube (2).

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