Tank body for vanadium redox flow battery liquid storage and vanadium redox flow battery

Abstract

The utility model discloses a vanadium redox battery liquid storage tank and a vanadium redox flow battery, the vanadium redox battery liquid storage tank comprises a tank body, a top liquid pipe and a bottom liquid pipe, the tank body is a vertically arranged column, and the inner side wall of the tank body is a smooth cambered surface; the liquid jacking pipe is arranged on the side wall of the upper part of the tank body, and the inner end of the liquid jacking pipe is communicated with the tank body and is tangent to the arc surface of the inner side wall of the tank body; the bottom liquid pipe is arranged on the side wall of the lower portion of the tank body, the inner end of the bottom liquid pipe is communicated with the tank body and tangent to the arc face of the inner side wall of the tank body, and the lowest position of the inner end of the bottom liquid pipe is flush with the inner bottom wall of the tank body. The problem that turbulence and a dead zone are prone to being generated in an existing vanadium battery tank can be solved, the resistance of vanadium battery electrolyte entering and exiting the tank is reduced, and the energy consumption level of a pump is further reduced. And meanwhile, all the electrolyte participates in the oxidation-reduction reaction in the galvanic pile, so that the vanadium ion utilization rate of the all-vanadium redox flow battery is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to vanadium cell technical field, concretely relates to a kind of tank for vanadium cell liquid storage and vanadium flow battery. BACKGROUND

[0002] Vanadium flow battery is the most widely researched and applied liquid flow battery, and its main advantages are as follows: (1) it can conveniently realize large-scale energy storage: the energy of vanadium battery is stored in electrolyte, and the capacity of vanadium battery is determined by the volume of tank and the concentration of electrolyte, and the electrolyte has good consistency, so it can achieve large-scale energy storage of GWh (1 million degrees of electricity); (2) long service life: vanadium battery can be deeply discharged without damaging the battery, and the service life of the battery is long, and the charge-discharge cycle life exceeds 20,000 times; (3) good safety: vanadium battery has no explosion or fire hazard, and even if the positive and negative electrolytes are mixed, there is no danger, only the temperature of the electrolyte is slightly increased, and it is a battery that never explodes. In addition, vanadium battery has the advantages of fast response speed, large power, high efficiency and no memory effect, and is considered as a "perfect battery" for large-scale energy storage.

[0003] The basic principle of vanadium battery is that vanadium ion solutions with different valence states are stored in positive and negative electrolyte storage tanks respectively, and positive and negative electrolytes are provided to the battery stack through an external pump, and after the oxidation-reduction reaction occurs in the battery, the electrolytes return to the storage tank respectively, and the electrolytes in the storage tank are capacity units during the entire oxidation-reduction reaction process, which determines the length of time of battery charging and discharging, and the stack is a power unit, which determines the power of the battery.

[0004] The existing vanadium battery tank generally has the following problems: (1) vortex (turbulence) may occur when the liquid enters and exits the pipeline, which increases the energy consumption of the input and output electrolyte of the circulating pump and the equipment wear; (2) there may be a dead zone in the tank, and the liquid cannot participate in the electrochemical reaction. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a tank for vanadium battery liquid storage, which can solve the problem of turbulence and dead zone in the existing vanadium battery tank, reduce the resistance of vanadium battery electrolyte entering and exiting the tank, and further reduce the energy consumption level of the pump. The tank can make all the electrolyte participate in the internal oxidation-reduction reaction of the stack, and further improve the utilization rate of vanadium ions in the all-vanadium flow battery.

[0006] The utility model is realized by the following technical solutions:

[0007] A kind of vanadium battery liquid storage tank, including tank, the tank is vertically arranged column, the inner side wall of the tank is smooth cambered surface;Top liquid pipe and bottom liquid pipe, the top liquid pipe is arranged in the upper lateral wall of the tank, the inner end of the top liquid pipe is communicated with the tank, and it is tangent with the cambered surface of the inner side wall of the tank;The bottom liquid pipe is arranged in the lower lateral wall of the tank, the inner end of the bottom liquid pipe is communicated with the tank, and it is tangent with the cambered surface of the inner side wall of the tank, the inner end of the bottom liquid pipe is flush with the inner bottom wall of the tank at the lowest.

[0008] Optionally, the tank is cylindrical or elliptical cylindrical;The lateral wall of the tank is equal thickness;The top liquid pipe and the bottom liquid pipe are horizontally arranged.

[0009] Optionally, the top liquid pipe and the bottom liquid pipe can be communicated with the same spiral flow channel, and the spiral flow channel spirally rises or spirally descends around the inner lateral wall of the tank.

[0010] Optionally, the top liquid pipe and the bottom liquid pipe are arranged in parallel and towards the same side of the tank;When the tank is cylindrical, the top liquid pipe and the bottom liquid pipe are respectively located at both ends of any diameter of the tank;When the tank is elliptical cylindrical, the top liquid pipe and the bottom liquid pipe are respectively located at both ends of the major axis of the tank, or at both ends of the minor axis of the tank.

[0011] Optionally, the inner bottom wall of the tank is inclined plane, and the inner end of the bottom liquid pipe is flush with the lowest part of the inner bottom wall of the tank at the lowest.

[0012] Optionally, the inclination angle of the inner bottom wall of the tank is 0.1°-30°.

[0013] Optionally, the bottom of the tank is connected with a stabilizing disc, and the diameter of the stabilizing disc is greater than the outer diameter of the tank.

[0014] Optionally, the bottom of the tank is hollowed out to form a maintenance cavity between the inner bottom wall of the tank and the stabilizing disc;The bottom lateral wall of the tank is provided with a maintenance hole, and the inner end of the maintenance hole is communicated with the maintenance cavity, and the outer end is communicated with the external environment.

[0015] Optionally, the bottom of the tank is hollowed out to form a maintenance cavity between the inner bottom wall of the tank and the stabilizing disc;The bottom lateral wall of the tank is provided with a maintenance hole, and the inner end of the maintenance hole is communicated with the maintenance cavity, and the outer end is communicated with the external environment.

[0016] A kind of vanadium flow battery, comprising: power stack, as the power unit of vanadium flow battery, containing: ion exchange membrane and electrode, electrode is electrically connected with ion exchange membrane, the electrode is equipped with output end, and the output end is used to output electric current;Full vanadium one vanadium battery liquid storage tank, the top liquid pipe and the bottom liquid pipe of two the tank are connected with the power stack by circulating pump respectively, form closed system of liquid flow, the system is filled with vanadium electrolyte, and the energy (time length) unit of vanadium flow battery is formed.

[0017] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0018] The utility model provides a kind of vanadium battery liquid storage tank, by setting up tank body is vertical column, and set its inner side wall is smooth camber, and set top liquid pipe and bottom liquid pipe, make the upper portion and lower portion of two tank body, the inner end of two is communicated with tank body interior respectively, and tangent with the camber of inner wall, liquid is passed into regardless of top liquid pipe or bottom liquid pipe, all will flow along the inner side wall of tank body to form cyclone (vortex is to refer to circulation flow), to form vortex in tank body, vortex makes liquid centrifugal force, centrifugal force makes liquid move outward along the tangent direction of the inner wall of tank body, liquid in tank body is all along tangent direction when entering and exiting top liquid pipe and bottom liquid pipe, therefore will not produce turbulent flow, to reduce energy loss and equipment wear and tear;On this basis, by setting the inner end of bottom liquid pipe lowest is flush with the inner bottom wall of tank body, liquid in tank body will flow under the action of gravity, it is favorable to improve the fluidity of liquid, simultaneously, liquid in tank body can all flow from the bottom, avoid to produce the "dead zone" of local non-flowing liquid in tank body, let all vanadium battery electrolyte participate in the oxidation-reduction electrochemical reaction carried out in power stack, can effectively improve the utilization rate of vanadium ion;By the mutual cooperation of above-mentioned each feature, the vanadium battery liquid storage tank can effectively solve the problem that the existing vanadium battery tank body is prone to turbulent flow and dead zone.Tank inlet and outlet pipe extend along the tangent direction of inner wall, vortex flow formed, can effectively reduce the resistance of liquid and tank, pipeline contact surface, to reduce the power consumption of circulating pump.The tank can let all electrolyte participate in the oxidation-reduction reaction inside power stack, further vanadium flow battery vanadium ion utilization rate. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings described herein are used to provide further understanding of the embodiments of the utility model, constitute a part of this application, and do not constitute the limitation to the embodiments of the utility model.In the drawings:

[0020] Figure 1 The vanadium battery liquid storage tank provided in the embodiments of the utility model is the schematic diagram of cylindrical shape;

[0021] Figure 2 The vanadium battery liquid storage tank provided in the embodiments of the utility model is the front view schematic diagram of cylindrical shape.

[0022] Figure 3 The top view schematic diagram of the cylindrical vanadium battery liquid storage tank provided by the embodiment of the present application is shown in the figure;

[0023] Figure 4 The schematic diagram of the elliptical cylindrical vanadium battery liquid storage tank provided by the embodiment of the present application is shown in the figure;

[0024] Figure 5 The schematic diagram of the vanadium liquid flow battery provided by the embodiment of the present application is shown in the figure.

[0025] The marks in the figure and the corresponding component names are as follows:

[0026] 1-ion exchange membrane; 2-electrode; 3-circulating pump; 4-electric pile; 10-tank; 20-top liquid pipe; 21-bottom liquid pipe; 30-stabilizing disc; 31-maintenance cavity; 32-maintenance hole; 40-sampling pipe. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the present application more clear and apparent, the present application will be further described in detail below with examples and figures, the schematic embodiment and the description thereof are only used to explain the present application, and do not limit the present application.

[0028] EMBODIMENT

[0029] Please refer to Figures 1 to 4 The embodiment provides a vanadium battery liquid storage tank, which comprises a tank 10, the tank 10 is vertically arranged in a columnar shape, the inner side wall of the tank 10 is a smooth arc surface; a second tank comprises a top liquid pipe 20 and a bottom liquid pipe 21, the top liquid pipe 20 is arranged on the upper side wall of the tank 10, the inner end of the top liquid pipe 20 is communicated with the tank 10, and is tangent to the arc surface of the inner side wall of the tank 10; the bottom liquid pipe 21 is arranged on the lower side wall of the tank 10, the inner end of the bottom liquid pipe 21 is communicated with the tank 10, and is tangent to the arc surface of the inner side wall of the tank 10, and the lowest position of the inner end of the bottom liquid pipe 21 is flush with the inner bottom wall of the tank 10.

[0030] The tank 10 for vanadium battery liquid storage provided by the embodiment is vertically columnar, the inner side wall is smooth arc, the top liquid pipe 20 and the bottom liquid pipe 21 are arranged at the upper and lower parts of the tank 10, the inner ends of the two pipes are respectively communicated with the inside of the tank 10 and tangent to the arc of the inner wall, no matter the liquid is introduced through the top liquid pipe 20 or the bottom liquid pipe 21, the liquid will flow along the inner side wall of the tank 10 to form a spiral flow, thus forming a vortex in the tank 10, the vortex generates a centrifugal force on the liquid, the centrifugal force makes the liquid move outward along the tangent direction of the inner wall of the tank 10, the liquid in the tank 10 enters and exits the top liquid pipe 20 and the bottom liquid pipe 21 along the tangent direction, thus no turbulent flow is generated, so that the energy loss and equipment wear are reduced; on this basis, the inner end of the bottom liquid pipe 21 is flush with the inner bottom wall of the tank 10, the liquid in the tank 10 flows naturally under the action of gravity, which is beneficial to improve the flowability of the liquid, at the same time, the liquid in the tank 10 can flow out from the bottom, avoiding the generation of a "dead zone" in which the liquid in the tank 10 does not flow, so that all vanadium battery electrolyte participates in the oxidation-reduction electrochemical reaction in the stack, which can effectively improve the utilization rate of vanadium ions; the tank 10 for vanadium battery liquid storage can effectively solve the problems of turbulent flow and dead zone in the existing vanadium battery tank 10 through the cooperation of the above features.

[0031] In order to further optimize the shape of the tank 10, the tank 10 is a cylinder or an elliptical cylinder; the side wall of the tank 10 is equal in thickness; the top liquid pipe 20 and the bottom liquid pipe 21 are both arranged horizontally. Preferably, the tank 10 is a cylinder.

[0032] In order to ensure the smooth flow of the spiral flow, the top liquid pipe 20 and the bottom liquid pipe 21 can be communicated with the same spiral line flow channel, and the spiral line flow channel spirally rises or spirally descends around the inner side wall of the tank 10.

[0033] In order to further explain the specific arrangement of the top liquid pipe 20 and the bottom liquid pipe 21, the top liquid pipe 20 and the bottom liquid pipe 21 are arranged in parallel and towards the same side of the tank 10; when the tank 10 is a cylinder, the top liquid pipe 20 and the bottom liquid pipe 21 are respectively located at the two ends of any diameter of the tank 10; when the tank 10 is an elliptical cylinder, the top liquid pipe 20 and the bottom liquid pipe 21 are respectively located at the two ends of the major axis of the tank 10 or at the two ends of the minor axis of the tank 10.

[0034] In order to further avoid the accumulation of liquid at the inner bottom of the tank 10, the inner bottom wall of the tank 10 is an inclined plane, and the inner end of the bottom liquid pipe 21 is flush with the lowest part of the inner bottom wall of the tank 10.

[0035] Preferably, the inclination angle of the inner bottom wall of the tank body 10 is 0.1°-30°.

[0036] To prevent the tank 10 from tipping over unnecessarily, a stabilizing plate 30 is connected to the bottom of the tank 10, and the diameter of the stabilizing plate 30 is larger than the outer diameter of the tank 10.

[0037] To facilitate maintenance and prevent water leakage from the inner bottom wall of the tank 10, the bottom of the tank 10 is hollowed out to form a maintenance cavity 31 between the inner bottom wall of the tank 10 and the stabilizing plate 30; a maintenance hole 32 is opened through the bottom side wall of the tank 10, the inner end of the maintenance hole 32 is connected to the maintenance cavity 31, and the outer end is connected to the external environment.

[0038] To facilitate monitoring of the parameters of the liquid inside the tank 10, a sampling tube 40 is connected to the side wall of the tank 10. The sampling tube 40 is located above the inner bottom wall of the tank 10 and is equipped with a sampling valve.

[0039] It should be noted that a thermometer and a level gauge are installed inside the tank 10.

[0040] Please Figures 1 to 4 Based on reference Figure 5 This embodiment also provides a vanadium redox flow battery, including: a stack 4, which is the power unit of the vanadium redox flow battery, containing: an ion exchange membrane 1 and an electrode 2, the electrode 2 being electrically connected to the ion exchange membrane 1, the electrode 2 being provided with an output terminal, the output terminal being used to output current; a vanadium battery storage tank 10, the top liquid pipe 20 and the bottom liquid pipe 21 of the two tanks 10 being respectively connected to the stack 4 through a circulation pump 3, forming a closed system for liquid flow, the system being filled with vanadium electrolyte, forming the energy (duration) unit of the vanadium redox flow battery.

[0041] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A tank for vanadium cell electrolyte, characterized by, The application relates to a tank body (10) for vanadium battery liquid storage. The tank body (10) is vertically arranged in a column shape, and the inner side wall of the tank body (10) is smooth and arc-shaped. A top liquid pipe (20) is arranged on the upper side wall of the tank body (10), the inner end of the top liquid pipe (20) is communicated with the tank body (10), and the inner end of the top liquid pipe (20) is tangent to the arc-shaped inner side wall of the tank body (10); a bottom liquid pipe (21) is arranged on the lower side wall of the tank body (10), the inner end of the bottom liquid pipe (21) is communicated with the tank body (10), and the inner end of the bottom liquid pipe (21) is tangent to the arc-shaped inner side wall of the tank body (10); the lowest position of the inner end of the bottom liquid pipe (21) is flush with the inner bottom wall of the tank body (10).

2. The vanadium cell storage tank according to claim 1, characterized by The tank body (10) is a cylinder or an elliptical cylinder. The side wall of the tank body (10) is equal in thickness. The top liquid pipe (20) and the bottom liquid pipe (21) are horizontally arranged.

3. The vanadium cell storage tank according to claim 2, characterized by The top liquid pipe (20) and the bottom liquid pipe (21) can be communicated with the same spiral flow channel which spirally ascends or spirally descends around the inner side wall of the tank body (10).

4. The vanadium cell storage tank according to claim 3, characterized by The top liquid pipe (20) and the bottom liquid pipe (21) are arranged in parallel and are directed to the same side of the tank body (10). When the tank body (10) is a cylinder, the top liquid pipe (20) and the bottom liquid pipe (21) are respectively arranged at the two ends of any diameter of the tank body (10). When the tank body (10) is an elliptical cylinder, the top liquid pipe (20) and the bottom liquid pipe (21) are respectively arranged at the two ends of the major axis of the tank body (10) or at the two ends of the minor axis of the tank body (10).

5. The tank for vanadium cell storage according to any one of claims 1 to 4, characterized in that, The inner bottom wall of the tank body (10) is an inclined plane, and the lowest position of the inner end of the bottom liquid pipe (21) is flush with the lowest position of the inner bottom wall of the tank body (10).

6. The vanadium cell storage tank of claim 5, wherein The inclination angle of the inner bottom wall of the tank body (10) is 0.1-30 degrees.

7. The vanadium cell storage tank of claim 5, wherein A stabilizing disc (30) is connected to the bottom of the tank body (10), and the diameter of the stabilizing disc (30) is larger than the outer diameter of the tank body (10).

8. The vanadium cell storage tank of claim 7, wherein The bottom of the tank body (10) is hollow, and a maintenance cavity (31) is formed between the inner bottom wall of the tank body (10) and the stabilizing disc (30). A maintenance hole (32) is formed in the bottom side wall of the tank body (10), the inner end of the maintenance hole (32) is communicated with the maintenance cavity (31), and the outer end of the maintenance hole (32) is communicated with the external environment.

9. The vanadium cell storage tank of claim 8, wherein A sampling pipe (40) is arranged in the side wall of the tank body (10) and is arranged above the inner bottom wall of the tank body (10), and the sampling pipe (40) is provided with a sampling valve.

10. A vanadium flow battery characterised in that, Two tank bodies (10) for vanadium battery liquid storage are arranged, and the top liquid pipes (20) and the bottom liquid pipes (21) of the two tank bodies (10) are respectively connected with an electric pile system (1) through a circulating pump (3).

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