WO2020029370A1

WO2020029370A1 - Rechargeable zinc-air flow cell device

Info

Publication number: WO2020029370A1
Application number: PCT/CN2018/105609
Authority: WO
Inventors: 陈忠伟
Original assignee: 苏州沃泰丰能电池科技有限公司
Priority date: 2018-08-06
Filing date: 2018-09-14
Publication date: 2020-02-13
Also published as: CN208690391U

Abstract

A rechargeable zinc-air flow cell device, comprising: a water storage tank (1), an electrolytic solution storage tank (2), a battery pack (3) and a liquid storage tank (4); the water storage tank (1) communicates with the electrolytic solution storage tank (2) through a tube (5), the electrolytic solution storage tank (2) communicates with the battery pack (3) through the tube (5), and the battery pack (3) communicates with the liquid storage tank (4) through the tube (5); the battery pack (3) comprises at least two battery cells (31), the battery cells (31) comprising a zinc anode layer (311), an electrolytic solution layer (312) and an air cathode layer (313), the electrolytic solution layer (312) being located between the zinc anode layer (311) and the air cathode layer (313); the battery cells (31) are connected in series, and the electrolytic solution layers (312) in the battery cells (31) communicate with each other; and said device further comprises an anti-corrosion pump (6) for driving water or electrolytic solution to circulate between the electrolytic solution storage tank (2), the tube (5), the electrolytic solution layers (312) of the battery pack and the liquid storage tank (4). The flow cell device manufactured by means of the method above uses oxygen in the air as an active material in the positive electrode, uses zinc as the negative electrode and uses an alkaline solution as the electrolyte, which does not contain any material that easily causes combustion or explosion, thereby having high safety and great popularization and utilization values.

Description

Rechargeable zinc air-liquid flow battery device

Technical field

The invention relates to the technical field of battery energy storage, in particular to a rechargeable zinc air-liquid flow battery device.

Background technique

For a long time, human production and life have always depended on fossil energy such as oil and coal. China is the second largest oil consumer in the world. However, more than half of the oil depends on imports. Among them, crude oil imports in 2013 were 282 million tons. Reaching 58.5%, this value has exceeded the internationally defined "safety alert line" (50%). Therefore, China faces severe oil security challenges. Global climate change has had an important impact on the international energy situation. Coupled with the large-scale haze problem in recent years, it has become even more important for China to accelerate the implementation of the transformation of its energy strategy. In this context, it is an inevitable choice to develop and use new energy sources and take the path of green and sustainable development. Renewable energy in new energy is the top priority. High efficiency, cleanness and low carbon have become the mainstream of new energy development in the world. However, the intermittent and uncontrollable nature of wind and solar power are the limiting factors affecting the development of renewable energy. In 2014, with the rapid development of new energy, especially photovoltaic power generation technology and applications, in order to solve the stability and friendliness of new energy high-penetration grid access, the necessity of energy storage technology applications has been widely recognized in the industry. The future development trend of energy interconnection and energy complementation has provided a broad application space for energy storage technology. Energy storage has become the key in the development of renewable and clean energy.

The energy storage market includes large-scale energy storage, home energy storage, and backup power storage. In the prior art, the price-performance ratio of lead-carbon batteries and lithium batteries in the field of back-up power storage has been significantly improved. The fields of back-up power and home energy storage are more suitable for the two battery applications at this stage. Rechargeable zinc-air batteries have many advantages and are a branch of the energy storage industry. Zinc-air batteries use oxygen from air that originates from the atmosphere. It has no cost and is inexhaustible, eliminating the need to store fuel sources in the battery. In addition, the use of catalysts to reduce oxygen electrochemically in zinc-air batteries has not been used in practice after a charge-discharge cycle, which makes it theoretically possible to work indefinitely. In addition, zinc air batteries use oxygen and zinc as active materials. Zinc has large reserves and high energy density. In general, zinc-air batteries have been vigorously developed because of their low material cost and high performance, safety and environmental friendliness. .

Summary of the invention

The technical problem mainly solved by the invention is to provide a rechargeable zinc air-liquid flow battery device, which does not contain any materials that are likely to cause combustion or explosion, improves the safety of battery use, and has the ability to be charged multiple times and has a large capacity density. And low cost.

In order to achieve the above objective, the technical solution adopted by the present invention to solve its technical problems is:

A rechargeable zinc air-fluid battery device includes: a water storage tank, an electrolyte storage tank, a battery pack, a liquid storage tank, an air pump, and a corrosion-resistant pump;

The water storage tank communicates with the electrolyte storage tank through a pipeline, the electrolyte storage tank communicates with a battery pack through a pipeline, the battery pack communicates with a liquid storage tank through a pipeline, and the liquid storage tank communicates with an electrolyte storage tank through a pipeline The pipeline is connected; the air pump is arranged on a pipeline connecting the electrolyte storage tank and the battery pack;

The battery pack includes at least two single cells, and the single cells include a zinc anode layer, an electrolyte layer, and an air cathode layer, and the electrolyte layer is located between the zinc anode layer and the air cathode layer; The single cells are connected in series, and the electrolyte layers in the single cells are connected;

The corrosion-resistant pump includes a motor, a fixed shaft is provided at the bottom of the motor, an output shaft of the motor is fixedly connected to the fixed shaft, a main shaft is provided at the bottom of the fixed shaft, and a protection device is provided at the bottom of the main shaft, the protection The bottom of the device is provided with a fixed rod, and an impeller is provided on the outside of the fixed rod, the impeller is arranged inside the casing, a liquid inlet is provided on one side of the casing, and a liquid outlet is provided on the other side of the casing.

Preferably, the zinc anode layer includes an electrolyte-permeable metal mesh and / or a metal foam.

Preferably, the electrolytic solution in the electrolytic solution layer is an alkaline electrolytic solution.

Preferably, the alkaline electrolyte is one of potassium hydroxide, sodium hydroxide or lithium hydroxide.

Preferably, the electrolytic solution in the electrolytic solution layer includes a dissolved and saturated zinc salt.

Preferably, the zinc salt is one or more of ZnO, Zn (OH) ₂ , K ₂ Zn (OH) ₄ , and Na ₂ Zn (OH) ₄ .

Preferably, the number of the electrolyte storage tanks is at least two.

Preferably, the protective device includes a protective cover, a bearing is provided inside the protective cover, a protective rod is provided inside the bearing, and the main shaft and the fixed rod are both fixedly connected to the protective rod.

Preferably, the impeller includes a rotating drum, the rotating drum is fixedly connected with a fixed rod, a leaf plate is provided on the outer side of the drum, a slide groove is provided on the surface of the leaf plate, and a leaf column is provided on the top of the leaf plate.

Due to the application of the above technical solutions, the present invention has the following beneficial effects compared with the prior art:

Provided is a rechargeable zinc air-flow battery device that uses oxygen in the air as a positive electrode active material, uses zinc as a negative electrode, and uses an alkaline solution as an electrolyte, and does not contain any materials that easily cause combustion or explosion, and has high safety. , Has great promotion and utilization value.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a rechargeable zinc air-flow battery device according to a preferred embodiment of the present invention.

2 is a schematic diagram of a single battery in a rechargeable zinc air-flow battery device according to the present invention.

3 is a schematic diagram of a corrosion-resistant pump in a rechargeable zinc air-flow battery device according to the present invention.

4 is a schematic diagram of a protective device in a rechargeable zinc air-flow battery device according to the present invention.

FIG. 5 is a partially enlarged view at A in FIG. 4.

Description of the drawings: 1 water storage tank, 2 electrolyte storage tank, 3 battery pack, 31 single cell, 311 zinc anode layer, 312 electrolyte layer, 313 air cathode layer, 4 liquid storage tank, 5 pipeline, 6 corrosion resistance Pump, 61 motor, 62 fixed shaft, 63 main shaft, 64 protective device, 641 protective cover, 642 bearing, 643 protective rod, 644 vane, 645 chute, 65 fixed rod, 66 impeller, 67 housing, 68 liquid inlet, 69 outlet, 7 bracket, 8 air pump.

detailed description

The following describes the preferred embodiments of the present invention in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the protection scope of the present invention is more clearly defined.

Referring to the drawings, a rechargeable zinc air-flow battery device includes a water storage tank 1, an electrolyte storage tank 2, a battery pack 3, a liquid storage tank 4, and an air pump 8. A water storage tank 1, an electrolyte storage tank 2, a battery pack 3, and a liquid storage tank 4 are mounted on the bracket 7. The water storage tank 1 communicates with the electrolyte storage tank 2 through a pipe 5; the electrolyte storage tank 2 communicates with the battery pack 3 through a pipe 5; the battery pack 3 communicates with the liquid storage tank 4 through a pipe 5; the liquid storage tank 4 communicates with the electrolyte storage The tank 2 communicates through a pipe 5. The air pump 8 is provided on a pipeline connecting the electrolyte storage tank 2 and the battery pack 3 to provide oxygen required for the electrode reaction. The number of the electrolytic solution storage tanks 2 is at least two, which fully guarantees the supply of the electrolytic solution and improves the working efficiency.

The battery pack 3 includes at least two unit cells 31. The unit cell 31 includes a zinc anode layer 311, an electrolyte layer 312, and an air cathode layer 313. The electrolyte layer 312 is located between the zinc anode layer 311 and the air cathode layer 313. The zinc anode layer 311 includes an electrolyte permeable and alkali-resistant metal mesh and / or the electrolyte in the metal foam electrolyte layer 312 is an alkaline electrolyte. The alkaline electrolyte is one of potassium hydroxide, sodium hydroxide, or lithium hydroxide. The electrolytic solution in the electrolytic solution layer 312 includes a dissolved and saturated zinc salt. The zinc salt is one or more of ZnO, Zn (OH) ₂ , K ₂ Zn (OH) ₄ , and Na ₂ Zn (OH) ₄ . The battery cells 31 are connected in series, and the electrolyte layer 312 in the battery cells 31 communicate with each other. The electrolyte layers 312 of the first and last battery cells communicate with the electrolyte storage tank 2 through the pipeline 5.

The battery pack 3 is composed of a plurality of single cells 31. Each of the single cells 31 has a cathode for gas diffusion and a metal anode, and has a certain amount of an alkaline electrolyte, that is, the ones in the present invention respectively. The air cathode layer 313, the zinc anode layer 311, and the electrolyte layer 312. When the single cell 31 is operating, an electromotive force is generated between the cathode and the anode. By embedding a current collector on the cathode and the anode, the electric energy can be polymerized and derived.

Zinc air batteries contain a high concentration of electrolyte inside, which is highly alkaline and corrosive, such as potassium hydroxide. Once leakage occurs, it will corrode parts near the battery, and this corrosion may be irreparable and fatal. The zinc-air battery device further includes a corrosion-resistant pump 6 for driving water or electrolyte to circulate between the electrolyte storage tank 2, the pipeline 5, the electrolyte layer 312 of the battery pack 3, and the liquid storage tank 4. The corrosion-resistant pump 6 can be arranged on a pipeline between the liquid storage tank 4 and the electrolyte storage tank 2, and is mainly used to drive the electrolyte from the liquid storage tank 4 to flow back into the electrolyte storage tank 2.

The anti-corrosion pump 6 includes a motor 61. A fixed shaft 62 is provided at the bottom of the motor 61. The output shaft of the motor 61 is fixedly connected to the fixed shaft 62. The bottom of the fixed shaft 62 is provided with a main shaft 63. The bottom of the main shaft 63 is provided with a protective device 64. A fixed rod 65 is provided at the bottom, and an impeller 66 is provided on the outside of the fixed rod 65. The impeller 66 is provided inside the housing 67. A liquid inlet 68 is provided on one side of the housing 67, and a liquid outlet 69 is provided on the other side of the housing 67. By providing the impeller 66, it is beneficial to improve the conveying efficiency.

The protective device 64 includes a protective cover 641. A bearing 642 is provided inside the protective cover 641, and a protective rod 643 is provided inside the bearing 642. Both the main shaft 63 and the fixed rod 65 are fixedly connected to the protective rod 643. The protective device 64 is beneficial for protecting the protective rod 643 from being corroded by the corrosive chemical medium, and at the same time, the bearing 642 plays a role of fixing the protective rod 643, so that the impeller 66 is more stable during the rotation.

The impeller 66 includes a rotating drum, and the rotating drum is fixedly connected to the fixed rod 65. A leaf plate 644 is provided on the outer side of the drum, and a sliding groove 645 is provided on the surface of the leaf plate 644. The sliding groove 645 can effectively reduce the adhesion of corrosive chemical media. After the impeller 66 stops rotating, an inclined angle is generated, and the water droplets of the corrosive chemical medium converge in sequence through the chute 645, and then fall along the chute 645, thereby reducing the corrosion of the impeller 66 by the corrosive chemical medium. The top of the leaf plate 644 is provided with a leaf column, which can increase the transmission efficiency and the amount of the corrosive chemical medium, and at the same time increase the tightness between the leaf plate 644 and the leaf plate 644.

When the battery pack 3 starts to work, the electrolyte is first introduced into the electrolyte layer 312 of the single cell 31 from the outside of the battery pack 3 by the gravity from the electrolyte storage tank 2 through the pipeline 5. The electrolyte first fills the electrolyte layer 312 of each single cell 31 in the battery pack 3, and then with the increase of the introduced electrolyte, the battery pack 3 starts to work for use, and the air electrode is pumped through the air pump 8 to start Electrochemical reaction. After completion, the electrolytic solution in the electrolytic solution layer 312 of the single cell 31 is introduced into the liquid storage tank 4 from the pipe 5. Driven by the corrosion-resistant pump 6, the electrolyte is pumped back into the electrolyte tank through the liquid storage tank 4 for the next charge and discharge cycle. When not in use for a long time, the electrolyte storage tank 2, the battery pack 3 and the liquid storage tank 4 are cleaned from the water storage tank 1 through the pipeline 5 into the electrolyte storage tank 2, the battery pack 3 and the liquid storage tank 4 in order to ensure that Battery safety.

The above are only embodiments of the present invention, and thus do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the description and drawings of the present invention, or directly or indirectly used in other related technical fields, All the same are included in the patent protection scope of the present invention.

Claims

A rechargeable zinc air-liquid flow battery device, comprising: a water storage tank, an electrolyte storage tank, a battery pack, a liquid storage tank, an air pump, and a corrosion-resistant pump;

The water storage tank communicates with the electrolyte storage tank through a pipeline, the electrolyte storage tank communicates with a battery pack through a pipeline, the battery pack communicates with a liquid storage tank through a pipeline, and the liquid storage tank communicates with an electrolyte storage tank through a pipeline The pipeline is connected; the air pump is arranged on a pipeline connecting the electrolyte storage tank and the battery pack;

The battery pack includes at least two single cells, and the single cells include a zinc anode layer, an electrolyte layer, and an air cathode layer, and the electrolyte layer is located between the zinc anode layer and the air cathode layer; The single cells are connected in series, and the electrolyte layers in the single cells are connected;

The corrosion-resistant pump includes a motor, a fixed shaft is provided at the bottom of the motor, an output shaft of the motor is fixedly connected to the fixed shaft, a main shaft is provided at the bottom of the fixed shaft, and a protection device is provided at the bottom of the main shaft, the protection The bottom of the device is provided with a fixed rod, and an impeller is provided on the outside of the fixed rod, the impeller is arranged inside the casing, a liquid inlet is provided on one side of the casing, and a liquid outlet is provided on the other side of the casing.
The rechargeable zinc air-flow battery device according to claim 1, wherein the zinc anode layer comprises a metal mesh and / or metal foam that is permeable to electrolyte.
The rechargeable zinc air-flow battery device according to claim 1, wherein the electrolytic solution in the electrolytic solution layer is an alkaline electrolytic solution.
The rechargeable zinc air-flow battery device according to claim 3, wherein the alkaline electrolyte is one of potassium hydroxide, sodium hydroxide, or lithium hydroxide.
The rechargeable zinc air-flow battery device according to claim 1, wherein the electrolytic solution in the electrolytic solution layer comprises a dissolved and saturated zinc salt.
The rechargeable zinc air-flow battery device according to claim 5, wherein the zinc salt is ZnO, Zn (OH) 2 , K 2 Zn (OH) 4 , Na 2 Zn (OH) 4 One or more of them.
The rechargeable zinc air-flow battery device according to claim 1, wherein the number of the electrolyte storage tanks is at least two.
The rechargeable zinc air-flow battery device according to claim 1, wherein the protective device comprises a protective cover, a bearing is provided inside the protective cover, a protective rod is provided inside the bearing, and Both the main shaft and the fixed rod are fixedly connected with the protective rod.
The rechargeable zinc air-flow battery device according to claim 1, wherein the impeller includes a rotating drum, the rotating drum is fixedly connected to a fixed rod, and a leaf plate is provided on the outer side of the rotating drum, so that The surface of the leaf plate is provided with a chute, and the top of the leaf plate is provided with a leaf column.