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A zinc-bromine single-flow stack and battery

A zinc-bromine mono- and liquid-current technology, which is used in fuel cells, regenerative fuel cells, fuel cell additives, etc., can solve the problems of insufficient operation stability of the stack, poor uniformity of battery electrolyte distribution, and large pressure difference. , to achieve the effect of uniform electrolyte distribution, high operation stability and extended process

Active Publication Date: 2022-04-19
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a zinc-bromine single-flow electric stack and battery, which solves the problem of the existing zinc-bromine single-flow electric stack, where the electrolyte flows through the electrolyte inlet and outlet of the two battery cells close to the stack support. The pressure at the time is quite different from the pressure at the inlet and outlet of the electrolyte flowing through the rest of the battery cells in the middle, resulting in poor electrolyte distribution uniformity and insufficient stack operation stability.

Method used

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  • A zinc-bromine single-flow stack and battery
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Embodiment 1

[0059] Assemble the zinc-bromine single flow battery of the structure of the present invention, the electrode area is 800cm 2 , the thickness of the positive electrode frame and the negative electrode frame is 4 mm, the thickness of the first bluff body and the second bluff body are both 4 mm, and the number of the first bluff body and the second bluff body is 2 respectively. Charge and discharge current is 40mA / cm 2 , charging time is 60 minutes. 20 battery cells were connected in series using bipolar plates to form a battery pack. The electrolyte of the battery pack is composed of 2mol / l zinc bromide, 0.8mol / l complexing agent and 3mol / l potassium chloride solution, and the volume of the electrolyte is 50L.

Embodiment 2

[0061] Assemble the zinc-bromine single flow battery of the structure of the present invention, the electrode area is 800cm 2 , the thickness of the positive electrode frame and the negative electrode frame is 4 mm, the thickness of the first bluff body and the second bluff body are both 4 mm, and the number of the first bluff body and the second bluff body is 5 respectively. Charge and discharge current is 40mA / cm 2 , charging time is 60 minutes. 20 battery cells were connected in series using bipolar plates to form a battery pack. The electrolyte of the battery pack is composed of 2mol / l zinc bromide, 0.8mol / l complexing agent and 3mol / l potassium chloride solution, and the volume of the electrolyte is 50L.

Embodiment 3

[0063] Assemble the zinc-bromine single flow battery of the structure of the present invention, the electrode area is 800cm 2 , the thickness of the positive electrode frame and the negative electrode frame is 4 mm, the thickness of the first bluff body and the second bluff body is 4 mm, and the number of the first bluff body and the second bluff body is 10 respectively. Charge and discharge current is 40mA / cm 2 , charging time is 60 minutes. 20 battery cells were connected in series using bipolar plates to form a battery pack. The electrolyte of the battery pack is composed of 2mol / l zinc bromide, 0.8mol / l complexing agent and 3mol / l potassium chloride solution, and the volume of the electrolyte is 50L.

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Abstract

The invention discloses a zinc-bromine single liquid flow stack and a battery. The stack includes a battery unit, a stack support body and a bluff body; the stack support body includes a first stack support body and a second stack support body, and the first stack support body and the second stack support body are respectively located on The two opposite sides of the battery unit are used to support and fasten the battery unit; the bluff body includes a first bluff body and a second bluff body, and the first bluff body and the second bluff body are respectively located on the first stack support body and the second stack support body. Between the stack support and the battery unit, it is used to prolong the flow of electrolyte flowing in or out of the battery unit. The invention avoids the first battery unit and the last battery unit of the battery stack at the end of the common flow channel by adding a baffle body between the stack support body and the battery unit, and balances the pressure difference between the inlet and outlet of the electrolyte flowing through each battery unit , so that the electrolyte distribution of the stack is more uniform, and the stability of the stack operation is higher.

Description

technical field [0001] The invention belongs to the technical field of liquid flow battery energy storage, and in particular relates to a zinc-bromine single flow electric stack and a battery. Background technique [0002] Zinc-bromine flow battery is a low-cost, high-efficiency, and environment-friendly flow energy storage battery. It has the advantages of high energy density and current efficiency, simple and easy operation of the device, long service life, and low cost. It is mainly used in power grids Peak shaving, wind energy and solar energy and other renewable energy power generation, electric vehicles and other fields. The traditional zinc-bromine flow battery adopts a double-pump and double-pipe design. During the charging and discharging process, the circulating pump is used to drive the electrolyte to circulate in the battery. However, since zinc-bromine flow batteries require electrolyte circulation systems such as circulating pumps and liquid storage tanks, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/18H01M8/04276
CPCH01M8/188H01M8/04276Y02E60/50
Inventor 苑辰光李先锋郑琼张华民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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