High-power underground chamber flow battery system

Abstract

A high-power underground chamber flow battery system disclosed by the present invention comprises a liquid storage unit, a conveying unit and an electric pile unit, and the conveying unit comprises a first conveying pipe, a second conveying pipe, a third conveying pipe, a fourth conveying pipe, a first conveying pump, a second conveying pump, a third conveying pump and a fourth conveying pump. The electric pile unit comprises a reaction container, an ion exchange membrane, a positive plate and a negative plate; the storage tank has the beneficial effects that the underground chamber is used as the storage tank of the flow battery, so that the storage tank has the characteristics of low cost, large capacity and economical occupied area, and is of great significance for realizing large-scale application of the flow battery based on the underground chamber; and meanwhile, oxides generated at the positive electrode or reduzates generated at the negative electrode during charging can be stored together in a centralized manner, and high-concentration collection is realized, so that an efficient oxidation-reduction reaction can be carried out in the discharging process, higher energy density is obtained, and the voltage stability in the discharging process is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid flow battery systems, and in particular to a high-power underground chamber liquid flow battery system. Background Art

[0002] Liquid flow battery is an electrochemical energy storage technology proposed by Thaller in 1974. It is a new type of battery. Liquid flow battery consists of a battery stack unit, electrolyte, electrolyte storage and supply unit, and management control unit. It is a high-performance battery that separates the positive and negative electrolytes and circulates them separately. It has the characteristics of high capacity, wide application field, and long cycle life. It is a new energy product.

[0003] The positive and negative electrolytes of the battery are respectively contained in two storage tanks, and the electrolytes are circulated through the battery by a liquid delivery pump. Inside the battery stack, the positive and negative electrolytes are separated by an ion exchange membrane (or ion diaphragm), and the battery is externally connected to a load and a power source. As a new type of large-scale and efficient electrochemical energy storage (electricity) technology, liquid flow battery technology realizes the mutual conversion and energy storage of electrical energy and chemical energy through the valence change of reactive substances. In liquid flow batteries, active substances are stored in electrolytes and have fluidity, which can realize the spatial separation of the electrochemical reaction site (electrode) and the energy storage active substance. The battery power and capacity design are relatively independent, which is suitable for large-scale power storage needs. Unlike ordinary secondary batteries, the energy storage active materials and electrodes of liquid flow batteries are completely separated, and the power and capacity designs are independent of each other, which makes it easy to combine modules and place the battery structure; the electrolyte is stored in a tank and will not self-discharge; the battery stack only provides a place for electrochemical reactions and does not undergo redox reactions itself; the active materials are dissolved in the electrolyte, and the risk of electrode dendrite growth piercing the diaphragm is greatly reduced in liquid flow batteries; at the same time, the flowing electrolyte can take away the heat generated by the battery charging / discharging process, avoiding damage to the battery structure or even combustion due to battery heating.

[0004] The storage tanks of flow batteries are usually arranged on the ground. Taking the Dalian 100-megawatt flow battery energy storage peak-shaving power station as an example, the power station has 716 large storage tanks and 358 containers, covering an area of ​​about 14,000 square meters. Such huge land and storage device costs limit the benefits and development of flow battery systems.

[0005] At the same time, when the volume of the storage tank is large, the concentration of the oxides and reduced products generated during charging will be low and extremely unevenly distributed in the storage tank, resulting in the current density and energy density of the flow battery being too small or the voltage generated being unstable, which cannot meet the needs of the electricity user, making it difficult to achieve large-scale promotion and application. Summary of the invention

[0006] The purpose of the present invention is to overcome the above-mentioned technical deficiencies and propose a high-power underground chamber liquid flow battery system to solve the technical problems in the prior art that the storage tank of the liquid flow battery system occupies a large area, and the current density and energy density generated by the liquid flow battery system are too small or the voltage generated is unstable.

[0007] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0008] The present invention provides a high-power underground chamber flow battery system, comprising:

[0009] A liquid storage unit, the liquid storage unit comprising a positive electrode low-valent electrolyte chamber, a positive electrode high-valent electrolyte chamber, a negative electrode high-valent electrolyte chamber and a negative electrode low-valent electrolyte chamber arranged underground;

[0010] A delivery unit, the delivery unit includes a first delivery pipe, a second delivery pipe, a third delivery pipe, a fourth delivery pipe, a first delivery pump, a second delivery pump, a third delivery pump and a fourth delivery pump, one end of the first delivery pipe is connected to the positive electrode low-valent electrolyte chamber, one end of the second delivery pipe is connected to the positive electrode high-valent electrolyte chamber, one end of the third delivery pipe is connected to the negative electrode low-valent electrolyte chamber, one end of the fourth delivery pipe is connected to the negative electrode high-valent electrolyte chamber, and the inlet of the first delivery pump is connected to the positive electrode low-valent electrolyte chamber. The first delivery pump is connected to the positive electrode high-valent electrolyte chamber, the outlet of the first delivery pump is connected to one end of the first delivery pipe, the inlet of the second delivery pump is connected to the positive electrode high-valent electrolyte chamber, the outlet of the second delivery pump is connected to one end of the second delivery pipe, the inlet of the third delivery pump is connected to the negative electrode low-valent electrolyte chamber, the outlet of the third delivery pump is connected to one end of the third delivery pipe, the inlet of the fourth delivery pump is connected to the negative electrode high-valent electrolyte chamber, the outlet of the fourth delivery pump is connected to one end of the fourth delivery pipe, and,

[0011] A stack unit, the stack unit comprising a reaction container, an ion exchange membrane, a positive electrode plate and a negative electrode plate, the ion exchange membrane being arranged in the reaction container and dividing the inner cavity of the reaction container into a positive electrode reaction chamber and a negative electrode reaction chamber, one end of the positive electrode reaction chamber being connected to the other end of the first delivery tube, the other end of the positive electrode reaction chamber being connected to the other end of the second delivery tube, one end of the negative electrode reaction chamber being connected to the other end of the third delivery tube, the other end of the negative electrode reaction chamber being connected to the other end of the fourth delivery tube, the positive electrode plate being in contact with the positive electrode reaction chamber, the positive electrode plate being used to be electrically connected to the positive electrode on the power supply side or the power consumption side, the negative electrode plate being in contact with the negative electrode reaction chamber, the negative electrode plate being used to be electrically connected to the negative electrode on the power supply side or the power consumption side.

[0012] In some embodiments, a first temperature detection element, a first heating element and a first cooling element are provided in the positive electrode low-valent electrolyte chamber, wherein the first heating element is used to heat the electrolyte in the positive electrode low-valent electrolyte chamber, and the first cooling element is used to cool the electrolyte in the positive electrode low-valent electrolyte chamber;

[0013] The positive electrode high-valent electrolyte chamber is provided with a second temperature detection element, a second heating element and a second cooling element, wherein the second heating element is used to heat the electrolyte in the positive electrode high-valent electrolyte chamber, and the second cooling element is used to cool the electrolyte in the positive electrode high-valent electrolyte chamber;

[0014] The negative electrode low-valent electrolyte chamber is provided with a third temperature detection element, a third heating element and a third cooling element, wherein the third heating element is used to heat the electrolyte in the negative electrode low-valent electrolyte chamber, and the third cooling element is used to cool the electrolyte in the negative electrode low-valent electrolyte chamber;

[0015] A fourth temperature detecting element, a fourth heating element and a fourth cooling element are provided in the negative electrode high-valent electrolyte chamber. The fourth heating element is used to heat the electrolyte in the negative electrode high-valent electrolyte chamber, and the fourth cooling element is used to cool the electrolyte in the negative electrode high-valent electrolyte chamber.

[0016] In some embodiments, a first liquid level detection component is arranged on the inner top surface of the positive electrode low-valent electrolyte chamber, and the first liquid level detection component is used to detect the liquid level of the electrolyte in the positive electrode low-valent electrolyte chamber; a second liquid level detection component is arranged on the inner top surface of the positive electrode high-valent electrolyte chamber, and the second liquid level detection component is used to detect the liquid level of the electrolyte in the positive electrode high-valent electrolyte chamber; a third liquid level detection component is arranged on the inner top surface of the negative electrode low-valent electrolyte chamber, and the third liquid level detection component is used to detect the liquid level of the electrolyte in the negative electrode low-valent electrolyte chamber; a fourth liquid level detection component is arranged on the inner top surface of the negative electrode high-valent electrolyte chamber, and the fourth liquid level detection component is used to detect the liquid level of the electrolyte in the negative electrode high-valent electrolyte chamber.

[0017] In some embodiments, the first delivery pipe is also connected to a first bypass pipe, the first bypass pipe is communicated with the positive electrode low-valent electrolyte chamber, and the first bypass pipe is provided with a first bypass valve; the second delivery pipe is also connected to a second bypass pipe, the second bypass pipe is communicated with the positive electrode high-valent electrolyte chamber, and the second bypass pipe is provided with a second bypass valve; the third delivery pipe is also connected to a third bypass pipe, the third bypass pipe is communicated with the negative electrode low-valent electrolyte chamber, and the third bypass pipe is provided with a third bypass valve; the fourth delivery pipe is also connected to a fourth bypass pipe, the fourth bypass pipe is communicated with the negative electrode high-valent electrolyte chamber, and the fourth bypass pipe is provided with a fourth bypass valve.

[0018] In some embodiments, the first delivery pipe is provided with a first in-tube temperature detection member and a first temperature adjustment member, the first in-tube temperature detection member is used to detect the temperature of the electrolyte in the first delivery pipe, and the first temperature adjustment member is used to adjust the temperature of the electrolyte in the first delivery pipe; the second delivery pipe is provided with a second in-tube temperature detection member and a second temperature adjustment member, the second in-tube temperature detection member is used to detect the temperature of the electrolyte in the second delivery pipe, and the second temperature adjustment member is used to adjust the temperature of the electrolyte in the second delivery pipe; the third delivery pipe is provided with a third in-tube temperature detection member and a third temperature adjustment member, the third in-tube temperature detection member is used to detect the temperature of the electrolyte in the third delivery pipe, and the third temperature adjustment member is used to adjust the temperature of the electrolyte in the third delivery pipe; the fourth delivery pipe is provided with a fourth in-tube temperature detection member and a fourth temperature adjustment member, the fourth in-tube temperature detection member is used to detect the temperature of the electrolyte in the fourth delivery pipe, and the fourth temperature adjustment member is used to adjust the temperature of the electrolyte in the fourth delivery pipe.

[0019] In some embodiments, the stack unit further includes a positive terminal plate and a negative terminal plate, wherein the positive terminal plate is fixed to one side of the reaction container, and the negative terminal plate is fixed to the other side of the reaction container.

[0020] In some embodiments, the battery stack unit also includes a positive current collector and a negative current collector, the positive current collector is fixed to the positive terminal plate and electrically connected to the positive plate, the positive current collector is used to be electrically connected to the positive electrode on the power supply side or the power consumption side, the negative current collector is fixed to the negative terminal plate and electrically connected to the negative plate, the negative current collector is used to be electrically connected to the negative electrode on the power supply side or the power consumption side.

[0021] In some embodiments, the positive current collector is electrically connected to the positive electrode plate via a positive electrode connection conductor, and the negative current collector is electrically connected to the negative electrode plate via the negative electrode connection conductor.

[0022] In some embodiments, the positive electrode current collector is electrically connected to the positive electrode on the power supply side or the power consumption side via the power grid, and the negative electrode current collector is electrically connected to the negative electrode on the power supply side or the power consumption side via the power grid.

[0023] In some embodiments, the positive current collector is electrically connected to one conductor of the power grid via a positive conductor, and the negative current collector is electrically connected to another conductor of the power grid via a negative conductor.

[0024] Compared with the prior art, the high-power underground chamber liquid flow battery system provided by the present invention has the following beneficial effects: by using the underground chamber as a storage tank for the liquid flow battery, it has the characteristics of low cost, large capacity and economical land use, which is of great significance for realizing large-scale application of liquid flow batteries based on underground chambers; at the same time, the oxides generated at the positive electrode or the reduced products generated at the negative electrode during charging can be stored together, achieving high-concentration collection, so that efficient redox reactions can be carried out during the discharge process, obtaining a higher energy density and improving the voltage stability during the discharge process. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of a high-power underground chamber flow battery system provided by an embodiment of the present invention;

[0026] Figure 2 yes Figure 1 A schematic diagram of the structure of the positive electrode low-valent electrolyte chamber;

[0027] Figure 3 yes Figure 1 Schematic diagram of the structure of the positive electrode high-valent electrolyte chamber;

[0028] Figure 4 yes Figure 1 A schematic diagram of the structure of the negative electrode low-valent electrolyte chamber;

[0029] Figure 5 yes Figure 1 A schematic diagram of the structure of the negative electrode high-valent electrolyte chamber;

[0030] Figure 6 yes Figure 1 A schematic diagram of the structure of the battery stack unit, power supply side, power consumption side and power grid;

[0031] Figure 7 yes Figure 6 A schematic diagram of the structure of the battery stack unit;

[0032] Description of the accompanying drawings: 1-liquid storage unit, 11-positive low-valent electrolyte chamber, 111-first temperature detection element, 112-first heating element, 113-first cooling element, 114-first liquid level detection element, 12-positive high-valent electrolyte chamber, 121-second temperature detection element, 122-second heating element, 123-second cooling element, 124-second liquid level detection element, 13-negative low-valent electrolyte chamber, 131-third temperature detection element, 132-third heating element Component, 133-third cooling component, 134-third liquid level detection component, 14-negative high-valent electrolyte chamber, 141-fourth temperature detection component, 142-fourth heating component, 143-fourth cooling component, 144-fourth liquid level detection component, 2-transport unit, 21-first transport pipe, 211-first bypass pipe, 212-first bypass valve, 213-first pipe temperature detection component, 214-first temperature adjustment component, 22-second transport pipe, 221-second bypass pipe, 22 2-second bypass valve, 223-second pipe temperature detector, 224-second temperature adjustment member, 23-third delivery pipe, 231-third bypass pipe, 232-third bypass valve, 233-third pipe temperature detector, 234-third temperature adjustment member, 24-fourth delivery pipe, 241-fourth bypass pipe, 242-fourth bypass valve, 243-fourth pipe temperature detector, 244-fourth temperature adjustment member, 25-first delivery pump, 26-second delivery pump, 27 -third delivery pump, 28-fourth delivery pump, 3-fuel cell unit, 31-reaction container, 311-positive electrode reaction chamber, 312-negative electrode reaction chamber, 32-ion exchange membrane, 33-positive electrode plate, 34-negative electrode plate, 35-positive electrode end plate, 36-negative electrode end plate, 37-positive electrode collector, 371-positive electrode connecting conductor, 372-positive electrode wire, 38-negative electrode collector, 381-negative electrode connecting conductor, 382-negative electrode wire, 4-power supply side, 5-power consumption side, 6-power grid. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0034] See also Figure 1 , Figure 1 It is a schematic structural diagram of a high-power underground chamber liquid flow battery system in one embodiment of the present invention. The high-power underground chamber liquid flow battery system includes a liquid storage unit 1, a transport unit 2 and a battery stack unit 3.

[0035] The liquid storage unit 1 includes a positive electrode low-valent electrolyte chamber 11, a positive electrode high-valent electrolyte chamber 12, a negative electrode low-valent electrolyte chamber 13, and a negative electrode high-valent electrolyte chamber 14 arranged underground. The positive electrode low-valent electrolyte chamber 11, the positive electrode high-valent electrolyte chamber 12, the negative electrode low-valent electrolyte chamber 13, and the negative electrode high-valent electrolyte chamber 14 in the present invention are located in a rock hill. It should be noted that the rock hill should be understood as any rock that meets the needs of the project, rather than a specific rock, and is not limited here. In order to ensure that the rock hill has good sealing and stability, it is necessary to first carry out targeted grouting and spraying protection in places where leakage may exist, so that it has good sealing. Then, after the grouting solidifies, an anti-corrosion layer is laid on the inner wall of the chamber. The purpose of laying the anti-corrosion layer is to prevent the positive or negative electrolyte from reacting with the inner wall of the positive low-valent electrolyte chamber 11, the positive high-valent electrolyte chamber 12, the negative low-valent electrolyte chamber 13 and the negative high-valent electrolyte chamber 14 to contaminate the positive or negative electrolyte. At the same time, it can also prevent the instability of the positive low-valent electrolyte chamber 11, the positive high-valent electrolyte chamber 12, the negative low-valent electrolyte chamber 13 and the negative high-valent electrolyte chamber 14. Therefore, in order to avoid these problems, it is necessary to first perform grouting spraying and lay an anti-corrosion layer. It should be further explained that all chambers in the present invention need to undergo the above-mentioned grouting spraying and laying of the anti-corrosion layer. Since the grouting spraying and laying of the anti-corrosion layer technology is now a mature technology, it will not be repeated here.

[0036] The delivery unit 2 includes a first delivery pipe 21, a second delivery pipe 22, a third delivery pipe 23, a fourth delivery pipe 24, a first delivery pump 25, a second delivery pump 26, a third delivery pump 27 and a fourth delivery pump 28. One end of the first delivery pipe 21 is connected to the positive electrode low-valent electrolyte chamber 11, one end of the second delivery pipe 22 is connected to the positive electrode high-valent electrolyte chamber 12, one end of the third delivery pipe 23 is connected to the negative electrode low-valent electrolyte chamber 13, one end of the fourth delivery pipe 24 is connected to the negative electrode high-valent electrolyte chamber 14, and the inlet of the first delivery pump 25 is connected to the positive electrode low-valent electrolyte chamber 11. The first delivery pump 25 is connected to the positive electrode high-valent electrolyte chamber 11, the outlet of the first delivery pump 25 is connected to one end of the first delivery pipe 21, the inlet of the second delivery pump 26 is connected to the positive electrode high-valent electrolyte chamber 12, the outlet of the second delivery pump 26 is connected to one end of the second delivery pipe 22, the inlet of the third delivery pump 27 is connected to the negative electrode low-valent electrolyte chamber 13, the outlet of the third delivery pump 27 is connected to one end of the third delivery pipe 23, the inlet of the fourth delivery pump 28 is connected to the negative electrode high-valent electrolyte chamber 14, and the outlet of the fourth delivery pump 28 is connected to one end of the fourth delivery pipe 24.

[0037] The stack unit 3 includes a reaction container 31, an ion exchange membrane 32, a positive electrode plate 33 and a negative electrode plate 34. The ion exchange membrane 32 is disposed in the reaction container 31 and divides the inner cavity of the reaction container 31 into a positive electrode reaction chamber 311 and a negative electrode reaction chamber 312. One end of the positive electrode reaction chamber 311 is connected to the other end of the first delivery pipe 21, and the other end of the positive electrode reaction chamber 311 is connected to the other end of the second delivery pipe 22. One end of the negative electrode reaction chamber 312 is connected to the other end of the third delivery pipe 23, and the other end of the negative electrode reaction chamber 312 is connected to the other end of the fourth delivery pipe 24. The positive electrode plate 33 contacts the positive electrode reaction chamber 311, and the positive electrode plate 33 is used to be electrically connected to the positive electrode of the power supply side 4 or the power consumption side 5. The negative electrode plate 34 contacts the negative electrode reaction chamber 312, and the negative electrode plate 34 is used to be electrically connected to the negative electrode of the power supply side 4 or the power consumption side 5.

[0038] When charging, the positive plate 33 is electrically connected to the positive electrode of the power supply side 4, and the negative plate 34 is electrically connected to the negative electrode of the power supply side 4. At this time, the liquid flow battery system is in a charging state. When the power supply side 4 outputs electric energy, the electric energy is transmitted to the positive plate 33 and the negative plate 34. At this time, the first delivery pump 25 is started, and the positive low-valent electrolyte stored in the positive low-valent electrolyte chamber 11 is delivered to the positive electrode reaction chamber 311. The positive low-valent electrolyte loses electrons and undergoes an oxidation reaction to generate a positive high-valent electrolyte. The positive high-valent electrolyte is then delivered to the positive high-valent electrolyte chamber 12 through the second delivery pipe 22 for storage. At the same time, at the negative end of the liquid flow battery when charging, the fourth delivery pump 28 delivers the negative electrode high-valent electrolyte stored in the negative electrode high-valent electrolyte chamber 14 to the negative electrode reaction chamber 312 through the fourth delivery pipe 24, and the negative electrode high-valent electrolyte obtains electrons in the negative electrode reaction chamber 312, undergoes a reduction reaction, and generates a negative electrode low-valent electrolyte, and then the negative electrode low-valent electrolyte is delivered to the negative electrode low-valent electrolyte chamber 13 through the third delivery pipe 23 for storage. These reactions result in the conversion of electrical energy into chemical energy and storage in the electrolyte. At the same time, ions flow between the two electrolytes inside the battery and are transmitted through the ion exchange membrane 32.

[0039] When the liquid flow battery system completes the charging state, it changes to the discharging state, the positive plate 33 is electrically connected to the positive electrode of the power consumption side 5, and the negative plate 34 is electrically connected to the negative electrode of the power consumption side 5. In the discharging state, the flow direction of the positive and negative electrolytes is opposite to that in the charging state. In the discharging state, the positive terminal is the second delivery pump 26, which delivers the positive high-valent electrolyte collected in the positive high-valent electrolyte chamber 12 in the charging state to the positive electrode reaction chamber 311 through the second delivery pipe 22, obtains electrons in the positive electrode reaction chamber 311, undergoes a reduction reaction, and generates a positive low-valent electrolyte, which is then delivered to the positive low-valent electrolyte chamber 11 through the first delivery pipe 21; at the same time, the negative terminal is the third delivery pump 27, which delivers the positive low-valent electrolyte collected in the negative low-valent electrolyte chamber 13 in the charging state. The negative electrode low-valent electrolyte is transported to the negative electrode reaction chamber 312 through the third delivery pipe 23, where it loses electrons and undergoes an oxidation reaction to generate a negative electrode high-valent electrolyte. The lost electrons are transferred to the negative electrode plate 34 and the power-consuming side 5, thereby forming an electric current. The negative electrode high-valent electrolyte is then transported to the negative electrode high-valent electrolyte chamber 14 through the fourth delivery pipe 24. These reactions cause the chemical energy stored in the electrolyte to be converted into electrical energy, which is released to the positive electrode plate 33 and the negative electrode plate 34, thereby continuously supplying power to the power-consuming side 5.

[0040] The technical solution provided by the present invention, by using the underground chamber as a storage tank for the liquid flow battery, has the characteristics of low cost, large capacity and economical land use, which is of great significance for realizing large-scale application of liquid flow batteries based on underground chambers; at the same time, the oxides generated at the positive electrode or the reduced products generated at the negative electrode during charging can be stored together, realizing high-concentration collection, so that efficient redox reactions can be carried out during the discharge process, obtaining higher energy density and improving the voltage stability during the discharge process.

[0041] In one embodiment, see Figure 1 and Figure 2 The positive electrode low-valent electrolyte chamber 11 is provided with a first temperature detecting element 111, a first heating element 112 and a first cooling element 113. The first heating element 112 is used to heat the electrolyte in the positive electrode low-valent electrolyte chamber 11, and the first cooling element 113 is used to cool the electrolyte in the positive electrode low-valent electrolyte chamber 11, so that the temperature of the electrolyte in the positive electrode low-valent electrolyte chamber 11 can be controlled to prevent the electrolyte temperature from being too high or too low, which affects the normal operation of the battery system.

[0042] In one embodiment, see Figure 1 and Figure 3The positive electrode high-valent electrolyte chamber 12 is provided with a second temperature detection component 121, a second heating component 122 and a second cooling component 123. The second heating component 122 is used to heat the electrolyte in the positive electrode high-valent electrolyte chamber 12, and the second cooling component 123 is used to cool the electrolyte in the positive electrode high-valent electrolyte chamber 12, so that the temperature of the electrolyte in the positive electrode high-valent electrolyte chamber 12 can be controlled to prevent the electrolyte temperature from being too high or too low, which affects the normal operation of the battery system.

[0043] In one embodiment, see Figure 1 and Figure 4 The negative electrode low-valent electrolyte chamber 13 is provided with a third temperature detecting element 131, a third heating element 132 and a third cooling element 133. The third heating element 132 is used to heat the electrolyte in the negative electrode low-valent electrolyte chamber 13, and the third cooling element 133 is used to cool the electrolyte in the negative electrode low-valent electrolyte chamber 13, so that the temperature of the electrolyte in the negative electrode low-valent electrolyte chamber 13 can be controlled to prevent the electrolyte temperature from being too high or too low, which affects the normal operation of the battery system.

[0044] In one embodiment, see Figure 1 and Figure 5 The negative electrode high-valent electrolyte chamber 14 is provided with a fourth temperature detecting element 141, a fourth heating element 142 and a fourth cooling element 143. The fourth heating element 142 is used to heat the electrolyte in the negative electrode high-valent electrolyte chamber 14, and the fourth cooling element 143 is used to cool the electrolyte in the negative electrode high-valent electrolyte chamber 14, so that the temperature of the electrolyte in the negative electrode high-valent electrolyte chamber 14 can be controlled to prevent the electrolyte temperature from being too high or too low, which affects the normal operation of the battery system.

[0045] In one embodiment, see Figure 1-Figure 5A first liquid level detection member 114 is provided on the inner top surface of the positive electrode low-valent electrolyte chamber 11, and the first liquid level detection member 114 is used to detect the liquid level of the electrolyte in the positive electrode low-valent electrolyte chamber 11; a second liquid level detection member 124 is provided on the inner top surface of the positive electrode high-valent electrolyte chamber 12, and the second liquid level detection member 124 is used to detect the liquid level of the electrolyte in the positive electrode high-valent electrolyte chamber 12. ; A third liquid level detection component 134 is arranged on the inner top surface of the negative electrode low-valent electrolyte chamber 13, and the third liquid level detection component 134 is used to detect the liquid level height of the electrolyte in the negative electrode low-valent electrolyte chamber 13; A fourth liquid level detection component 144 is arranged on the inner top surface of the negative electrode high-valent electrolyte chamber 14, and the fourth liquid level detection component 144 is used to detect the liquid level height of the electrolyte in the negative electrode high-valent electrolyte chamber 14.

[0046] It should be understood that the above-mentioned liquid level detection component can adopt an ultrasonic liquid level sensor, which can detect the liquid level height of the electrolyte in each chamber in real time, so as to promptly detect the leakage of the chamber. At the same time, during normal use, when the liquid level in a chamber is lower than the warning level, the extraction of electrolyte in the chamber will be stopped, thereby avoiding the idling of the pump body and ensuring the normal operation of the liquid flow battery system.

[0047] In one embodiment, see Figure 1-Figure 5 The first delivery pipe 21 is also connected to a first bypass pipe 211, the first bypass pipe 211 is communicated with the positive electrode low-valent electrolyte chamber 11, and a first bypass valve 212 is provided on the first bypass pipe 211; the second delivery pipe 22 is also connected to a second bypass pipe 221, the second bypass pipe 221 is communicated with the positive electrode high-valent electrolyte chamber 12, and a second bypass valve 222 is provided on the second bypass pipe 221. The third delivery pipe 23 is also connected to a third bypass pipe 231, the third bypass pipe 231 is communicated with the negative electrode low-valent electrolyte chamber 13, and a third bypass valve 232 is provided on the third bypass pipe 231; the fourth delivery pipe 24 is also connected to a fourth bypass pipe 241, the fourth bypass pipe 241 is communicated with the negative electrode high-valent electrolyte chamber 14, and a fourth bypass valve 242 is provided on the fourth bypass pipe 241.

[0048] When in use, when it is necessary to input electrolyte into a certain chamber, the corresponding bypass valve is opened, and the electrolyte enters the corresponding bypass pipe through the corresponding delivery pipe, and then is discharged from the corresponding bypass valve into the corresponding chamber; when it is necessary to extract electrolyte from a certain chamber, the corresponding bypass valve is closed, and the corresponding delivery pump is opened, and the delivery pump pumps the electrolyte into the reaction container 31. By setting the bypass valve, it is convenient to input electrolyte into the chamber.

[0049] In one embodiment, see Figure 1 and Figure 6 The first delivery pipe 21 is provided with a first in-tube temperature detection member 213 and a first temperature adjustment member 214, wherein the first in-tube temperature detection member 213 is used to detect the temperature of the electrolyte in the first delivery pipe 21, and the first temperature adjustment member 214 is used to adjust the temperature of the electrolyte in the first delivery pipe 21; the second delivery pipe 22 is provided with a second in-tube temperature detection member 223 and a second temperature adjustment member 224, wherein the second in-tube temperature detection member 223 is used to detect the temperature of the electrolyte in the second delivery pipe 22, and the second temperature adjustment member 224 is used to adjust the temperature of the electrolyte in the second delivery pipe 22 The third delivery pipe 23 is provided with a third in-tube temperature detecting member 233 and a third temperature regulating member 234, the third in-tube temperature detecting member 233 is used to detect the temperature of the electrolyte in the third delivery pipe 23, and the third temperature regulating member 234 is used to regulate the temperature of the electrolyte in the third delivery pipe 23; the fourth delivery pipe 24 is provided with a fourth in-tube temperature detecting member 243 and a fourth temperature regulating member 244, the fourth in-tube temperature detecting member 243 is used to detect the temperature of the electrolyte in the fourth delivery pipe 24, and the fourth temperature regulating member 244 is used to regulate the temperature of the electrolyte in the fourth delivery pipe 24.

[0050] When in use, the temperature detection component in the tube can detect the temperature of the electrolyte in the corresponding delivery tube, and the temperature adjustment component can heat or cool the electrolyte in the corresponding delivery tube, so that the temperature of the electrolyte entering the reaction container 31 can be kept stable, thereby ensuring the normal operation of the liquid flow battery system.

[0051] In one embodiment, see Figure 1 , Figure 6 and Figure 7 The stack unit 3 further includes a positive terminal plate 35 and a negative terminal plate 36 . The positive terminal plate 35 is fixed to one side of the reaction container 31 , and the negative terminal plate 36 is fixed to the other side of the reaction container 31 .

[0052] In one embodiment, see Figure 1 , Figure 6 and Figure 7 The battery stack unit 3 also includes a positive current collector 37 and a negative current collector 38. The positive current collector 37 is fixed to the positive terminal plate 35 and is electrically connected to the positive plate 33. The positive current collector 37 is used to be electrically connected to the positive electrode of the power supply side 4 or the power consumption side 5. The negative current collector 38 is fixed to the negative terminal plate 36 and is electrically connected to the negative plate 34. The negative current collector 38 is used to be electrically connected to the negative electrode of the power supply side 4 or the power consumption side 5.

[0053] In one embodiment, see Figure 1 , Figure 6 and Figure 7 The positive electrode current collector 37 is electrically connected to the positive electrode plate 33 via the positive electrode connection conductor 371 , and the negative electrode current collector 38 is electrically connected to the negative electrode plate 34 via the negative electrode connection conductor 381 .

[0054] In one embodiment, see Figure 1 , Figure 6 and Figure 7 The positive electrode collector 37 is electrically connected to the positive electrode of the power supply side 4 or the power consumption side 5 via the power grid 6, and the negative electrode collector 38 is electrically connected to the negative electrode of the power supply side 4 or the power consumption side 5 via the power grid 6. When in use, the power supply side 4 outputs electric energy, and the electric energy reaches the positive electrode collector 37 and the negative electrode collector 38 through the voltage regulation and distribution of the power grid 6, and the positive electrode collector 37 and the negative electrode collector 38 then transmit the current to the positive electrode plate 33 and the negative electrode plate 34.

[0055] In one embodiment, see Figure 1 , Figure 6 and Figure 7 The positive electrode current collector 37 is electrically connected to one wire of the power grid 6 via the positive electrode wire 372 , and the negative electrode current collector 38 is electrically connected to another wire of the power grid 6 via the negative electrode wire 382 .

[0056] In addition, in this embodiment, the chamber is connected to the ground by drilling a vertical well into the target chamber, so that the target chamber is connected to the ground, and then connected to the transmission pipeline on the ground to form a complete connection state.

[0057] Furthermore, in the present invention, two chambers are designed at each end of the positive electrode and the negative electrode to store electrolytes of different valence states in the liquid flow battery. It is worth noting that the number of chambers here can also be determined according to actual engineering needs, such as 3 or 4 or other numbers, which are not limited here.

[0058] Furthermore, the above-mentioned chamber does not specifically refer to a newly built artificial chamber, but may also refer to the utilization of abandoned underground space resources, such as underground space left over after mining.

[0059] The technical solution provided by the present invention, by using the underground chamber as a storage tank for the liquid flow battery, has the characteristics of low cost, large capacity and economical land use, which is of great significance for realizing large-scale application of liquid flow batteries based on underground chambers; at the same time, the oxides generated at the positive electrode or the reduced products generated at the negative electrode during charging can be stored together, realizing high-concentration collection, so that efficient redox reactions can be carried out during the discharge process, obtaining higher energy density and improving the voltage stability during the discharge process.

[0060] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A high-power underground chamber flow battery system, characterized in that: include: A liquid storage unit, the liquid storage unit comprising a positive electrode low-valent electrolyte chamber, a positive electrode high-valent electrolyte chamber, a negative electrode high-valent electrolyte chamber and a negative electrode low-valent electrolyte chamber arranged underground; A delivery unit, the delivery unit includes a first delivery pipe, a second delivery pipe, a third delivery pipe, a fourth delivery pipe, a first delivery pump, a second delivery pump, a third delivery pump and a fourth delivery pump, one end of the first delivery pipe is connected to the positive electrode low-valent electrolyte chamber, one end of the second delivery pipe is connected to the positive electrode high-valent electrolyte chamber, one end of the third delivery pipe is connected to the negative electrode low-valent electrolyte chamber, one end of the fourth delivery pipe is connected to the negative electrode high-valent electrolyte chamber, and the inlet of the first delivery pump is connected to the positive electrode low-valent electrolyte chamber. The first delivery pump is connected to the positive electrode high-valent electrolyte chamber, the outlet of the first delivery pump is connected to one end of the first delivery pipe, the inlet of the second delivery pump is connected to the positive electrode high-valent electrolyte chamber, the outlet of the second delivery pump is connected to one end of the second delivery pipe, the inlet of the third delivery pump is connected to the negative electrode low-valent electrolyte chamber, the outlet of the third delivery pump is connected to one end of the third delivery pipe, the inlet of the fourth delivery pump is connected to the negative electrode high-valent electrolyte chamber, the outlet of the fourth delivery pump is connected to one end of the fourth delivery pipe, and, A stack unit, the stack unit comprising a reaction container, an ion exchange membrane, a positive electrode plate and a negative electrode plate, the ion exchange membrane being arranged in the reaction container and dividing the inner cavity of the reaction container into a positive electrode reaction chamber and a negative electrode reaction chamber, one end of the positive electrode reaction chamber being connected to the other end of the first delivery tube, the other end of the positive electrode reaction chamber being connected to the other end of the second delivery tube, one end of the negative electrode reaction chamber being connected to the other end of the third delivery tube, the other end of the negative electrode reaction chamber being connected to the other end of the fourth delivery tube, the positive electrode plate being in contact with the positive electrode reaction chamber, the positive electrode plate being used to be electrically connected to the positive electrode on the power supply side or the power consumption side, the negative electrode plate being in contact with the negative electrode reaction chamber, the negative electrode plate being used to be electrically connected to the negative electrode on the power supply side or the power consumption side.

2. The high-power underground chamber flow battery system according to claim 1, characterized in that: The positive electrode low-valent electrolyte chamber is provided with a first temperature detection element, a first heating element and a first cooling element, wherein the first heating element is used to heat the electrolyte in the positive electrode low-valent electrolyte chamber, and the first cooling element is used to cool the electrolyte in the positive electrode low-valent electrolyte chamber; The positive electrode high-valent electrolyte chamber is provided with a second temperature detection element, a second heating element and a second cooling element, wherein the second heating element is used to heat the electrolyte in the positive electrode high-valent electrolyte chamber, and the second cooling element is used to cool the electrolyte in the positive electrode high-valent electrolyte chamber; The negative electrode low-valent electrolyte chamber is provided with a third temperature detection element, a third heating element and a third cooling element, wherein the third heating element is used to heat the electrolyte in the negative electrode low-valent electrolyte chamber, and the third cooling element is used to cool the electrolyte in the negative electrode low-valent electrolyte chamber; A fourth temperature detecting element, a fourth heating element and a fourth cooling element are provided in the negative electrode high-valent electrolyte chamber. The fourth heating element is used to heat the electrolyte in the negative electrode high-valent electrolyte chamber, and the fourth cooling element is used to cool the electrolyte in the negative electrode high-valent electrolyte chamber.

3. The high-power underground chamber flow battery system according to claim 1, characterized in that: A first liquid level detection component is arranged on the inner top surface of the positive electrode low-valent electrolyte chamber, and the first liquid level detection component is used to detect the liquid level of the electrolyte in the positive electrode low-valent electrolyte chamber; a second liquid level detection component is arranged on the inner top surface of the positive electrode high-valent electrolyte chamber, and the second liquid level detection component is used to detect the liquid level of the electrolyte in the positive electrode high-valent electrolyte chamber; a third liquid level detection component is arranged on the inner top surface of the negative electrode low-valent electrolyte chamber, and the third liquid level detection component is used to detect the liquid level of the electrolyte in the negative electrode low-valent electrolyte chamber; a fourth liquid level detection component is arranged on the inner top surface of the negative electrode high-valent electrolyte chamber, and the fourth liquid level detection component is used to detect the liquid level of the electrolyte in the negative electrode high-valent electrolyte chamber.

4. The high-power underground chamber flow battery system according to claim 1, characterized in that: The first delivery pipe is also connected to a first bypass pipe, which is in communication with the positive electrode low-valent electrolyte chamber, and a first bypass valve is provided on the first bypass pipe; the second delivery pipe is also connected to a second bypass pipe, which is in communication with the positive electrode high-valent electrolyte chamber, and a second bypass valve is provided on the second bypass pipe; the third delivery pipe is also connected to a third bypass pipe, which is in communication with the negative electrode low-valent electrolyte chamber, and a third bypass valve is provided on the third bypass pipe; the fourth delivery pipe is also connected to a fourth bypass pipe, which is in communication with the negative electrode high-valent electrolyte chamber, and a fourth bypass valve is provided on the fourth bypass pipe.

5. The high-power underground chamber flow battery system according to claim 1, characterized in that: The first delivery pipe is provided with a first in-tube temperature detection member and a first temperature adjustment member, wherein the first in-tube temperature detection member is used to detect the temperature of the electrolyte in the first delivery pipe, and the first temperature adjustment member is used to adjust the temperature of the electrolyte in the first delivery pipe; The second delivery pipe is provided with a second in-tube temperature detection member and a second temperature adjustment member, the second in-tube temperature detection member is used to detect the temperature of the electrolyte in the second delivery pipe, and the second temperature adjustment member is used to adjust the temperature of the electrolyte in the second delivery pipe; the third delivery pipe is provided with a third in-tube temperature detection member and a third temperature adjustment member, the third in-tube temperature detection member is used to detect the temperature of the electrolyte in the third delivery pipe, and the third temperature adjustment member is used to adjust the temperature of the electrolyte in the third delivery pipe; the fourth delivery pipe is provided with a fourth in-tube temperature detection member and a fourth temperature adjustment member, the fourth in-tube temperature detection member is used to detect the temperature of the electrolyte in the fourth delivery pipe, and the fourth temperature adjustment member is used to adjust the temperature of the electrolyte in the fourth delivery pipe.

6. The high-power underground chamber flow battery system according to claim 1, characterized in that: The stack unit further includes a positive terminal plate and a negative terminal plate. The positive terminal plate is fixed to one side of the reaction container, and the negative terminal plate is fixed to the other side of the reaction container.

7. The high-power underground chamber flow battery system according to claim 6, characterized in that: The battery stack unit also includes a positive current collector and a negative current collector. The positive current collector is fixed to the positive terminal plate and electrically connected to the positive plate. The positive current collector is used to be electrically connected to the positive electrode on the power supply side or the power consumption side. The negative current collector is fixed to the negative terminal plate and electrically connected to the negative plate. The negative current collector is used to be electrically connected to the negative electrode on the power supply side or the power consumption side.

8. The high-power underground chamber flow battery system according to claim 7, characterized in that: The positive electrode current collector is electrically connected to the positive electrode plate via a positive electrode connection conductor, and the negative electrode current collector is electrically connected to the negative electrode plate via the negative electrode connection conductor.

9. The high-power underground chamber flow battery system according to claim 7, characterized in that: The positive electrode current collector is electrically connected to the positive electrode on the power supply side or the power consumption side via the power grid, and the negative electrode current collector is electrically connected to the negative electrode on the power supply side or the power consumption side via the power grid.

10. The high-power underground chamber flow battery system according to claim 1, characterized in that: The positive electrode current collector is electrically connected to one wire of the power grid via a positive electrode wire, and the negative electrode current collector is electrically connected to another wire of the power grid via a negative electrode wire.

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