Static pipeline mixer for zinc-bromine flow battery electrolyte

Abstract

The utility model relates to a static pipeline mixer for zinc-bromine flow battery electrolyte, and belongs to the technical field of zinc-bromine flow battery operation. According to the technical scheme, the bottom of a positive electrolyte storage tank (1) is provided with a lower liquid outlet (4) of the positive electrolyte storage tank and is connected with one end of a first positive pipeline (5), and the upper part of the positive electrolyte storage tank is provided with an upper liquid outlet (3) of the positive electrolyte storage tank and is connected with one end of a second positive pipeline (6); the other end of the positive pipeline I and the other end of the positive pipeline II are connected together and then are connected with one end of a positive pipeline III (7); the other end of the positive pipeline III is connected with the battery stack; a stirring screw and a stirring rod are arranged in the third positive electrode pipeline and are jointly arranged on a stirrer shaft. According to the utility model, the upper layer and the lower layer of circulating electrolyte are fully mixed, so that the electrolyte mixing efficiency is improved, the electrolyte can fully react, and the charge-discharge efficiency, the energy efficiency and the coulombic efficiency of the zinc-bromine flow battery are further improved.

Description

Technical Field

[0001] The utility model relates to a static pipeline mixer for zinc-bromine liquid flow battery electrolyte, belonging to the technical field of zinc-bromine liquid flow battery operation. Background Art

[0002] Liquid flow batteries achieve the mutual conversion of electrical energy and chemical energy through reversible redox reactions (i.e., reversible changes in valence states) of active substances in the positive and negative electrolyte solutions. Zinc-bromine liquid flow batteries are a type of liquid flow battery. The positive and negative electrolytes of zinc-bromine liquid flow batteries are both ZnBr2 aqueous solutions, and the electrolyte is circulated through the positive and negative electrode surfaces by pumps. During charging, zinc is deposited on the negative electrode. During discharge, the zinc on the surface of the negative electrode dissolves, and at the same time, the complex bromine is pumped back into the circulation loop and broken up, converted into bromide ions, and the electrolyte returns to the state of zinc bromide. The reaction is completely reversible. However, after multiple cycles of the electrolyte of the zinc-bromine liquid flow battery, the bromine complex generated at the positive electrode will cause the solution in the positive electrolyte storage tank to be divided into two layers, the upper layer is the supernatant, and the upper and lower layers of liquid cannot be fully mixed, affecting the charging and discharging efficiency of the zinc-bromine liquid flow battery. Utility Model Content

[0003] The utility model aims to provide a static pipeline mixer for zinc-bromine flow battery electrolyte, which can fully mix the upper and lower layers of circulating electrolyte, improve the battery charging and discharging efficiency, and solve the above problems existing in the background technology.

[0004] The technical solution of the utility model is:

[0005] A static pipeline mixer for zinc-bromine liquid flow battery electrolyte comprises a positive electrode electrolyte storage tank, a battery stack, an upper liquid outlet of the positive electrode storage tank, a lower liquid outlet of the positive electrode storage tank, a positive electrode pipeline 1, a positive electrode pipeline 2, a positive electrode pipeline 3, a stirring spiral, a stirring rod and a stirrer shaft. The bottom of the positive electrode electrolyte storage tank is provided with a lower liquid outlet of the positive electrode storage tank and is connected to one end of the positive electrode pipeline 1. The upper part of the positive electrode electrolyte storage tank is provided with an upper liquid outlet of the positive electrode storage tank and is connected to one end of the positive electrode pipeline 2. The other end of the positive electrode pipeline 1 and the other end of the positive electrode pipeline 2 are connected together and then connected to one end of the positive electrode pipeline 3. The other end of the positive electrode pipeline 3 is connected to the battery stack. A stirring spiral and a stirring rod are provided in the positive electrode pipeline 3. The stirring spiral and the stirring rod are jointly arranged on the stirrer shaft. The stirring rod is arranged perpendicular to the stirrer shaft. The stirrer shaft and the positive electrode pipeline 3 are arranged coaxially.

[0006] The number of the stirring spirals and stirring rods are both multiple, and the stirring spirals and stirring rods are arranged at intervals on the stirrer shaft.

[0007] The liquid outlet on the positive electrode liquid storage tank is located at a position of 1 / 3-1 / 2 of the height of the positive electrode electrolyte liquid storage tank.

[0008] The battery stack is provided with a battery positive electrode liquid inlet, and the other end of the positive electrode pipeline three is connected to the battery positive electrode liquid inlet.

[0009] By adopting the utility model, the supernatant liquid in the positive electrode electrolyte storage tank flows out through the upper liquid outlet of the positive electrode storage tank and the positive electrode pipeline 2, and the sediment liquid at the bottom of the positive electrode electrolyte storage tank flows out through the lower liquid outlet of the positive electrode storage tank and the positive electrode pipeline 1. They are first mixed at the inlet of the positive electrode pipeline 3, and then fully stirred and mixed by the stirring spiral and the stirring rod, so that the electrolyte can fully react, thereby improving the charging and discharging efficiency of the zinc-bromine liquid flow battery.

[0010] The stirring screw and stirring rod can be driven by the pressure of the electrolyte flowing forward in the pipeline, and no additional power is required to fully mix the upper and lower layers of the zinc-bromine flow battery electrolyte. The stirring screw and stirring rod can also be driven by external power.

[0011] The utility model has the beneficial effects of fully mixing the upper and lower layers of circulating electrolyte, improving the electrolyte mixing efficiency, enabling the electrolyte to fully react, thereby improving the charge and discharge efficiency, energy efficiency and coulomb efficiency of the zinc-bromine flow battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the structure of an embodiment of the utility model;

[0013] In the figure: positive electrode electrolyte storage tank 1, battery stack 2, upper liquid outlet of positive electrode storage tank 3, lower liquid outlet of positive electrode storage tank 4, positive electrode pipeline 1 5, positive electrode pipeline 2 6, positive electrode pipeline 3 7, stirring spiral 8, stirring rod 9, battery positive electrode liquid inlet 10, and stirrer shaft 11. DETAILED DESCRIPTION

[0014] The present invention will be further described below through embodiments in conjunction with the accompanying drawings.

[0015] A static pipeline mixer for zinc-bromine flow battery electrolyte, comprising a positive electrode electrolyte storage tank 1, a battery stack 2, an upper liquid outlet 3 of the positive electrode storage tank, a lower liquid outlet 4 of the positive electrode storage tank, a positive electrode pipeline 1 5, a positive electrode pipeline 2 6, a positive electrode pipeline 3 7, a stirring screw 8, a stirring rod 9 and a stirring shaft 11, wherein the bottom of the positive electrode electrolyte storage tank 1 is provided with a positive electrode storage tank lower liquid outlet 4 and connected to one end of the positive electrode pipeline 1 5, and the upper part of the positive electrode electrolyte storage tank 1 is provided with a positive electrode storage tank The upper liquid outlet 3 is connected to one end of the positive electrode pipeline 2 6, the other end of the positive electrode pipeline 1 5 and the other end of the positive electrode pipeline 2 6 are connected together and then connected to one end of the positive electrode pipeline 3 7, and the other end of the positive electrode pipeline 3 7 is connected to the battery stack 2; the positive electrode pipeline 3 7 is provided with a stirring screw 8 and a stirring rod 9, the stirring screw 8 and the stirring rod 9 are jointly arranged on the stirring shaft 11, the stirring rod 9 is arranged perpendicular to the stirring shaft 11, and the stirring shaft 11 is arranged coaxially with the positive electrode pipeline 3 7.

[0016] The stirring screws 8 and the stirring rods 9 are both multiple in number, and the stirring screws 8 and the stirring rods 9 are arranged at intervals on the stirrer shaft 11 .

[0017] The liquid outlet 3 on the positive electrode liquid storage tank is located at a position of 1 / 3-1 / 2 of the height of the positive electrode electrolyte storage tank 1 .

[0018] The battery stack 2 is provided with a battery positive electrode liquid inlet 10, and the other end of the positive electrode pipeline 3 7 is connected to the battery positive electrode liquid inlet 10.

[0019] According to the utility model, the supernatant in the positive electrode electrolyte storage tank 1 flows out through the upper liquid outlet 3 of the positive electrode storage tank and the positive electrode pipeline 2 6, and the sediment liquid at the bottom of the positive electrode electrolyte storage tank 1 flows out through the lower liquid outlet 4 of the positive electrode storage tank and the positive electrode pipeline 1 5. They are first mixed at the entrance of the positive electrode pipeline 3 7, and then fully stirred and mixed by the stirring screw 8 and the stirring rod 9, so that the electrolyte can fully react, thereby improving the charging and discharging efficiency of the zinc-bromine liquid flow battery.

[0020] The stirring screw 8 and the stirring rod 9 are driven by the pressure of the electrolyte flowing forward in the pipeline, and do not require additional power to fully mix the upper and lower layers of the zinc-bromine flow battery electrolyte.

[0021] In the embodiment, the stirring spiral 8 and the stirring rod 9 are arranged at intervals, and the distance between two adjacent stirring rods 9 is 10 cm. The material of the stirring spiral 8 and the stirring rod 9 is UPVC or PP material that is resistant to bromide ion corrosion. The liquid outlet 3 on the positive electrode storage tank is located at 1 / 3 of the height of the positive electrode electrolyte storage tank 1.

[0022] The utility model was used to start circulating the zinc-bromine liquid flow battery. After 30 minutes, 60 minutes, 90 minutes, and 120 minutes of bromine complexation, the color of the electrolyte flowing out from 1 / 3 of the height and the bottom of the positive electrolyte storage tank 1 was observed respectively, and the color change of the electrolyte after the electrolyte passed through the positive electrode pipeline 37 and circulated back to the positive electrode electrolyte storage tank 1 was observed. 50mL of positive electrode electrolyte was taken at different times, and the change of bromide ion concentration in the electrolyte was detected by a spectrophotometer at a wavelength of 592. Finally, it was calculated that the mixing efficiency of bromide ions in the electrolyte reached 86%. Compared with the zinc-bromine liquid flow battery system without the utility model, the charging and discharging efficiency of the zinc-bromine liquid flow battery was increased by 6.5%, and the energy efficiency was increased by 8.0%.

Claims

1. A static pipeline mixer for zinc-bromine flow battery electrolyte, characterized in that: The invention comprises a positive electrode electrolyte storage tank (1), a battery stack (2), an upper liquid outlet (3) of the positive electrode storage tank, a lower liquid outlet (4) of the positive electrode storage tank, a first positive electrode pipeline (5), a second positive electrode pipeline (6), a third positive electrode pipeline (7), a stirring screw (8), a stirring rod (9) and a stirring shaft (11), wherein the bottom of the positive electrode electrolyte storage tank (1) is provided with a lower liquid outlet (4) of the positive electrode storage tank and is connected to one end of the first positive electrode pipeline (5), and the upper part of the positive electrode electrolyte storage tank (1) is provided with an upper liquid outlet (3) of the positive electrode storage tank and is connected to the second positive electrode pipeline The positive electrode pipeline (6) is connected to one end of the positive electrode pipeline (5), the other end of the positive electrode pipeline (5) and the other end of the positive electrode pipeline (6) are connected together and then connected to one end of the positive electrode pipeline (7), and the other end of the positive electrode pipeline (7) is connected to the battery stack (2); a stirring screw (8) and a stirring rod (9) are arranged in the positive electrode pipeline (7), the stirring screw (8) and the stirring rod (9) are arranged on the stirring shaft (11), the stirring rod (9) is arranged perpendicular to the stirring shaft (11), and the stirring shaft (11) and the positive electrode pipeline (7) are arranged coaxially.

2. A static pipeline mixer for zinc-bromine flow battery electrolyte according to claim 1, characterized in that: The stirring screws (8) and stirring rods (9) are both provided in plural numbers, and the stirring screws (8) and stirring rods (9) are arranged at intervals on the stirrer shaft (11).

3. A static pipeline mixer for zinc-bromine flow battery electrolyte according to claim 1, characterized in that: The liquid outlet (3) on the positive electrode liquid storage tank is located at a position 1 / 3-1 / 2 of the height of the positive electrode electrolyte liquid storage tank (1).

4. A static pipeline mixer for zinc-bromine flow battery electrolyte according to claim 1, characterized in that: The battery stack (2) is provided with a battery positive electrode liquid inlet (10), and the other end of the positive electrode pipeline three (7) is connected to the battery positive electrode liquid inlet (10).

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