Electrolyte separation device of vanadium battery energy storage system

Abstract

The invention discloses an electrolyte separation device of a vanadium battery energy storage system, and relates to the technical field of optimization of all-vanadium battery energy storage systems. The device comprises a box body, a liquid separation cavity is formed in the inner bottom side of the box body, a plurality of liquid conveying flow channels are formed in the box body and surround the liquid separation cavity, the liquid conveying flow channels extend upwards, penetrate through the upper side of the box body and are communicated with liquid conveying pipes, and a liquid inlet pipe communicated with the liquid separation cavity is arranged on the bottom face of the box body; therefore, when the electrolyte enters the branch pipes from the main material conveying pipe, the branch pipes can be isobaric.

Description

Technical Field

[0001] The invention relates to the technical field of all-vanadium battery energy storage system optimization, in particular to an electrolyte separation device for a vanadium battery energy storage 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] In order to ensure that the electrolyte can be better discharged or charged when entering the fuel cell stack, the electrolyte generally enters the fuel cell stack at a certain pressure. At present, the electrolyte is generally transported by pipeline. Before entering the fuel cell stack, the electrolyte is diverted to different branch pipes through the main feed pipe and flows into the corresponding fuel cell stack through the branch pipe. However, the existing branch pipes are generally arranged along the axial direction of the main feed pipe. This causes the hydraulic pressure in the main pipe to change due to the continuous outflow of electrolyte from the branch pipe along the flow direction of the electrolyte, resulting in different hydraulic pressures flowing into the fuel cell stack in different branch pipes, affecting the uniformity of charging and discharging. Summary of the invention

[0004] The object of the present invention is to provide an electrolyte separation device for a vanadium battery energy storage system, so as to achieve the purpose of isobaric pressure in each branch pipe when the electrolyte enters the branch pipe from the main feed pipe.

[0005] In order to achieve the above object, the present invention adopts the following technical means: A vanadium battery energy storage system electrolyte liquid separation device comprises a box body, a liquid separation cavity is constructed on the bottom side of the box body, a plurality of liquid infusion channels are constructed around the liquid separation cavity in the box body, the liquid infusion channels extend upward, pass through the upper side of the box body and are connected to a liquid infusion tube, and a liquid inlet tube connected to the liquid separation cavity is provided on the bottom surface of the box body.

[0006] Preferably, the liquid separation cavity is an ellipsoidal liquid separation cavity, and the infusion channel is connected to the side of the liquid separation cavity.

[0007] Furthermore, the infusion channel includes a first horizontal channel connected to the liquid separation cavity, the liquid outlet end of the first horizontal channel is connected to a lifting channel extending upward, the end of the lifting channel is connected to a second horizontal channel, and the second horizontal channel extends out of the box and is connected to the infusion tube.

[0008] Furthermore, the lifting flow channel is a spiral flow channel, and the lifting flow channel spirally extends upward around the vertical center axis of the liquid separation chamber, and the two ends of the lifting flow channel are respectively connected to the first horizontal flow channel and the second horizontal flow channel through arc flow channels.

[0009] Furthermore, a drainage pipe is also constructed in the box body, the drainage pipe is communicated with the top end of the liquid separation chamber, and the drainage pipe extends vertically upward and is communicated with the drainage pipe on the top surface of the box body.

[0010] Furthermore, an on-off valve is installed on the drain pipe.

[0011] Furthermore, the box body is filled with heat-insulating material, and the heat-insulating material covers the outer walls of the liquid separation cavity and the infusion channel.

[0012] During use, the present invention has the following beneficial effects: The electrolyte flows out from the electrolyte storage tank under the guidance of the main feed pipe. Before entering the branch pipe, the electrolyte first flows into the liquid separation cavity from bottom to top through the liquid inlet pipe. Then, after the electrolyte fills the liquid separation cavity, it can be continuously pressed into the infusion channel by the action of the hydraulic pressure in the liquid separation cavity during the continuous filling process. Finally, it is pressed into the infusion pipe from the infusion channel, and then enters the battery stack from the infusion pipe through the branch pipe. In this way, the setting of the liquid separation cavity is utilized, and the infusion flow channel is arranged around the liquid separation cavity, and the connecting port of the infusion flow channel and the liquid separation cavity is set on the same horizontal plane. In this way, through the setting of the liquid separation cavity, when the electrolyte is in different infusion flow channels, it is in an isobaric state. In this way, when the electrolyte passing through the infusion flow channel enters the battery stack through each branch pipe, it can be ensured that the electrolyte enters the battery stack at the same pressure. At the same time, the infusion flow channel can not only avoid cavity gas caused by slow flow rate by extending upward, but also increase the flow distance of the electrolyte due to the setting of the flow channel, thereby reducing the bypass current of the electrolyte. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a perspective structural schematic diagram of the present invention.

[0014] Figure 2 It is a schematic diagram of the perspective structure of the present invention.

[0015] Figure 3 It is a schematic diagram of the first cross-sectional structure of the present invention.

[0016] Figure 4 It is a schematic diagram of the horizontal cross-sectional structure of the liquid separation chamber of the present invention.

[0017] Among them, 1-box, 2-liquid separation cavity, 3-infusion channel, 4-infusion pipe, 5-liquid inlet pipe, 6-first horizontal flow channel, 7-lifting flow channel, 8-second horizontal flow channel, 9-drainage pipe, 10-drainage pipe. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0021] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0022] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use, or the positions or positional relationships commonly understood by those skilled in the art, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] Please refer to Figures 1 to 4 As shown, an electrolyte separation device for a vanadium battery energy storage system includes a box body 1, a separation cavity 2 is constructed on the bottom side of the box body 1, a plurality of infusion channels 3 are constructed around the separation cavity 2 in the box body 1, the infusion channels 3 extend upward, pass through the upper side of the box body 1 and are connected to an infusion tube 4, and a liquid inlet tube 5 connected to the separation cavity 2 is provided on the bottom surface of the box body 1.

[0025] In this way, the electrolyte flows out from the electrolyte storage tank under the guidance of the main feeding pipe. Before entering the branch pipe, the electrolyte first flows into the liquid separation chamber 2 from bottom to top through the liquid inlet pipe 5, and then after the electrolyte fills the liquid separation chamber 2, it can be continuously pressed into the infusion channel 3 by the effect of the hydraulic pressure in the liquid separation chamber 2 during the continuous drum liquid process, and finally pressed into the infusion pipe 4 from the infusion channel 3, and then enter the battery stack from the infusion pipe 4 through the branch pipe. In this way, the setting of the liquid separation chamber 2 is utilized, and the infusion channel 3 is arranged around the liquid separation chamber 2, and the connecting port of the infusion channel 3 and the liquid separation chamber 2 is set on the same horizontal plane. In this way, through the setting of the liquid separation chamber 2, when the electrolyte is angry at different infusion channels 3, it is in an isobaric state, so that when the electrolyte passing through the infusion channel 3 enters the battery stack through each branch pipe, it can be ensured that the electrolyte enters the battery stack at the same pressure. At the same time, the infusion channel 3 can not only avoid cavity gas caused by slow flow rate by extending upward, but also increase the flow distance of the electrolyte due to the setting of the channel, thereby reducing the bypass current of the electrolyte.

[0026] Furthermore, in order to allow the electrolyte in the liquid separation chamber 2 to better enter the infusion channel 3 from the liquid separation chamber 2 under the action of hydraulic pressure, the liquid separation chamber 2 is an ellipsoidal liquid separation chamber 2, and the infusion channel 3 is connected to the side of the liquid separation chamber 2.

[0027] In this way, when the liquid separation chamber 2 is filled, the elliptical inner wall of the liquid separation chamber 2 can facilitate the flow of liquid when the electrolyte is squeezed against the inner wall of the liquid separation chamber 2, so that the electrolyte in the liquid separation chamber 2 can flow out of the infusion channel 3 better and more conveniently.

[0028] At the same time, in order to allow the electrolyte to enter the infusion channel 3 more accurately and flow well, the infusion channel 3 includes a first horizontal channel 6 connected to the liquid separation chamber 2, the liquid outlet end of the first horizontal channel 6 is connected to an upwardly extending lifting channel 7, the end of the lifting channel 7 is connected to a second horizontal channel 8, and the second horizontal channel 8 extends out of the box 1 and is connected to the infusion tube 4.

[0029] In this way, the first horizontal flow channel 6 and the second horizontal flow channel 8 are respectively used to buffer the electrolyte flowing from the liquid separation chamber 2 into the infusion channel 3 and the electrolyte flowing from the infusion channel 3 into the infusion tube 4, thereby avoiding obstruction when the electrolyte directly enters the lifting channel 7 from the liquid separation chamber 2.

[0030] Furthermore, the lifting channel 7 is a spiral channel, and the lifting channel 7 spirally extends upward around the vertical center axis of the liquid separation chamber 2, and the two ends of the lifting channel 7 are respectively connected to the first horizontal channel 6 and the second horizontal channel 8 through arc channels.

[0031] In this way, the lifting flow channel 7 is arranged to be a spirally extended upward layout, which can further increase the flow distance of the electrolyte in the liquid separation device, thereby further reducing the bypass circuit of the electrolyte.

[0032] Furthermore, a drainage pipe 9 is constructed in the box body 1 , and the drainage pipe 9 is communicated with the top end of the liquid separation chamber 2 . The drainage pipe 9 extends vertically upward and is communicated with the drainage pipe 10 on the top surface of the box body 1 .

[0033] In this way, at the initial stage of operation of the equipment, that is, when the liquid separation chamber 2 is in a hollow state, after the electrode liquid enters the liquid separation chamber 2 and the liquid level is above the connecting port between the liquid separation chamber 2 and the infusion channel 3, the residual gas above the liquid level in the liquid separation chamber 2 can be discharged from the drain pipe 9, and as the electrolyte in the liquid separation chamber 2 increases, the excess electrolyte can move upward from the drain pipe 9 until the air in the drain pipe 9 is emptied.

[0034] Furthermore, in order to avoid affecting the pressure-maintaining state in the liquid separation chamber 2 after the discharge pipe 9 is provided, an on-off valve is installed on the discharge pipe 10 .

[0035] In this way, when the air in the discharge pipe 9 is exhausted, the on-off valve is closed, which can avoid the pressure relief in the liquid separation chamber 2 caused by the setting of the discharge pipe 9.

[0036] Furthermore, the box body 1 is filled with a heat-insulating material, and the heat-insulating material covers the outer walls of the liquid separation cavity 2 and the infusion channel 3 .

[0037] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An electrolyte separation device for a vanadium battery energy storage system, characterized in that: The invention comprises a box body (1), wherein a liquid separation cavity (2) is constructed on the bottom side of the box body (1), and a plurality of infusion channels (3) are constructed in the box body (1) and surround the liquid separation cavity (2). The infusion channels (3) extend upward, pass through the upper side of the box body (1) and are connected to an infusion tube (4), and a liquid inlet tube (5) connected to the liquid separation cavity (2) is provided on the bottom surface of the box body (1).

2. The electrolyte separation device of a vanadium battery energy storage system according to claim 1, characterized in that: The liquid separation cavity (2) is an ellipsoidal liquid separation cavity (2), and the infusion channel (3) is connected to the side of the liquid separation cavity (2).

3. The electrolyte separation device of a vanadium battery energy storage system according to claim 1, characterized in that: The infusion channel (3) comprises a first horizontal channel (6) connected to the liquid separation chamber (2); the liquid outlet end of the first horizontal channel (6) is connected to a lifting channel (7) extending upward; the end of the lifting channel (7) is connected to a second horizontal channel (8); the second horizontal channel (8) extends out of the box (1) and is connected to the infusion tube (4).

4. The electrolyte separation device of a vanadium battery energy storage system according to claim 3 is characterized in that: The lifting flow channel (7) is a spiral flow channel, and the lifting flow channel (7) spirally extends upward around the vertical center axis of the liquid separation chamber (2), and the two ends of the lifting flow channel (7) are respectively connected to the first horizontal flow channel (6) and the second horizontal flow channel (8) through arc flow channels.

5. The electrolyte separation device of a vanadium battery energy storage system according to claim 1, characterized in that: A drainage pipe (9) is also constructed in the box body (1), and the drainage pipe (9) is connected to the top end of the liquid separation chamber (2). The drainage pipe (9) extends vertically upward and is connected to the drainage pipe (10) on the top surface of the box body (1).

6. The electrolyte separation device of a vanadium battery energy storage system according to claim 5, characterized in that: An on-off valve is installed on the drain pipe (10).

7. The electrolyte separation device of a vanadium battery energy storage system according to claim 1, characterized in that: The box body (1) is filled with a heat-insulating material, and the heat-insulating material covers the outer walls of the liquid separation cavity (2) and the infusion channel (3).

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