High-performance and stable thermal regeneration electrochemical cycle battery adopting double-membrane structure

Abstract

The invention belongs to the technical field of thermal-electrochemical conversion, and particularly relates to a high-performance and stable thermal regeneration electrochemical cycle battery adopting a double-membrane structure. An intermediate electrolyte layer is arranged between the positive electrolyte and the negative electrolyte, an anion ion exchange membrane and a cation ion exchange membrane are adopted to separate the intermediate electrolyte from the positive electrolyte and the negative electrolyte respectively, and a solvent of the positive electrolyte, the negative electrolyte and the intermediate electrolyte is acetonitrile, water or a mixture of acetonitrile and water. According to the invention, stable pairing between the positive electrolyte and the negative electrolyte with different pH stable ranges and active substance charge symbols and high thermoelectric potential can be ensured, the thermoelectric potential, the power and the efficiency of the TREC battery can be effectively improved, the battery capacity is maintained, and the charge-discharge cycle life of the battery is prolonged. The technical route provided by the invention has universality, and can be applied to static batteries and also can be used for constructing flow batteries, so that the power and efficiency of TREC batteries are further improved, and effective recycling of low-grade heat is realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of thermal-electrochemical conversion, and in particular relates to a high-performance, stable thermal regeneration electrochemical cycle battery with a double-membrane structure. Background Art

[0002] Due to the thermodynamic irreversibility of energy conversion, about 1.2PWh of the primary energy consumed globally each year is released into the atmosphere in the form of heat, accounting for 72% of the total energy consumption. Of this, about 63% is low-grade waste heat (<100°C). Industrial waste heat, geothermal energy, solar energy, building heating, human body heat dissipation, and electronic equipment are all important sources of abundant low-grade heat. Converting low-grade thermal energy into electrical energy is an ideal path to address the global energy crisis and environmental challenges. However, such heat sources lack cost-effectiveness due to their low energy density and dispersed distribution. For example, many studies in the past have focused on semiconductor thermoelectric devices based on the Seebeck effect, but their application is limited by high cost and the use of rare elements. In addition, semiconductor materials can usually only generate a thermoelectric potential of about 0.1mV / K, which makes it difficult to generate enough voltage and power for effective energy harvesting under the limited temperature difference between the low-grade heat source and the environment.

[0003] In recent years, electrochemical thermoelectric conversion devices with high ion thermoelectric potential, such as thermal diffusion ion capacitors, thermal batteries, and thermal regeneration electrochemical cycles (TRECs), have provided new ideas for recovering low-grade thermal energy. Among them, TREC batteries have received extensive research attention because they can usually achieve a high Carnot relative efficiency of more than 10%. TREC batteries are isothermal devices that simultaneously utilize the temperature dependence of the anode and cathode electrodes in their working principle. Their open circuit voltage V oc The change with temperature is defined as the battery thermoelectric potential α cell :

[0004]

[0005] Among them, E + and E- are the potentials of the positive and negative electrode reaction pairs respectively; α + and α - The thermoelectric potentials of the positive and negative electrode reactions are respectively. Therefore, the TREC battery can convert the temperature difference into electrical work output by performing charge and discharge cycles at different temperatures. Obviously, the use of positive and negative electrode reaction pairs with opposite thermoelectric potentials to improve the battery α cell The absolute value of is the key to increasing battery voltage and output power.

[0006] However, the current challenge is that it is difficult to obtain high α while ensuring electrolyte stability. cellAccording to the Born solvation model, the electron pair with a higher positive thermoelectric potential is usually a transition metal cation, such as V 3+ / V 2+ and Fe 3+ / Fe 2+ , but these pairs are stable in acidic environments; the pairs with negative thermoelectric potential are anions, such as Fe(CN)6 3- / Fe(CN)6 4- , this anion pair is stable in a neutral or alkaline environment. This mismatch in pH stability range leads to the poor cycling stability of TREC batteries. In addition to the pH matching problem, it is also feasible for the positive and negative active materials to have the same charge sign. For example, the positive and negative electrode pairs are I3 - / I - and Fe(CN)6 3- / Fe(CN)6 4- However, the thermoelectric potential of the combined TREC battery is only 1.9 mV / K, which leads to low efficiency of the battery. 2+ / Cu(NH3) 2+ and Fe(CN)6 3- / Fe(CN)6 4- TRECFB has a higher thermoelectric potential |α cell |=2.9mV / K, however, the different charge signs between active ion pairs make it difficult to find the best ion exchange membrane to prevent ion cross-reaction.

[0007] Patent CN117747896A discloses a non-chargeable thermal regeneration electrochemical battery based on a double membrane structure and a method of use. By changing the ratio of Prussian blue analog metal materials, electrolyte concentration and embedded ions, the positive electrode potential and thermoelectric potential are regulated, and the double membrane structure is used to effectively block the negative electrode Fe 2+ / Fe 3+ and ClO 4- The effect on the positive electrode ion insertion and extraction process can achieve long-term stable cycling. However, the thermoelectric potential of this scheme is -2.5~-3mV / K, which needs to be further improved. Summary of the invention

[0008] The purpose of the present invention is to provide a high-performance, stable thermal regeneration electrochemical cycle battery with a double membrane structure, which significantly improves the battery thermoelectric potential by optimizing the battery structure and electrolyte composition to achieve efficient recovery and utilization of low-grade thermal energy.

[0009] To achieve the above-mentioned object, the present invention provides a thermal regeneration electrochemical cycle battery with a double membrane structure, comprising a positive electrode, a positive electrode electrolyte, an intermediate layer electrolyte, a negative electrode electrolyte, a negative electrode, an anion exchange membrane and a cation exchange membrane; the positive electrode electrolyte and the negative electrode electrolyte are two different redox pairs with opposite thermoelectric potential signs; the cations of the intermediate layer electrolyte are selected from the cations of the positive electrode electrolyte, and the anions are selected from the anions of the negative electrode electrolyte, or the cations of the intermediate layer electrolyte are selected from the cations of the negative electrode electrolyte, and the anions are selected from the anions of the positive electrode electrolyte;

[0010] When the cations of the intermediate layer electrolyte are the same as the cations of the positive electrode electrolyte, the intermediate layer electrolyte and the positive electrode electrolyte are separated by a cation exchange membrane, and the intermediate layer electrolyte and the negative electrode electrolyte are separated by an anion exchange membrane;

[0011] When the anions of the intermediate layer electrolyte and the anions of the positive electrode electrolyte are the same, the intermediate layer electrolyte and the positive electrode electrolyte are separated by an anion exchange membrane, and the intermediate layer electrolyte and the negative electrode electrolyte are separated by a cation exchange membrane;

[0012] The solvents of the positive electrode electrolyte, the intermediate layer electrolyte, and the negative electrode electrolyte are independently selected from acetonitrile, water, or a mixture of acetonitrile and water. Preferably, the solvents of the positive electrode electrolyte, the intermediate layer electrolyte, and the negative electrode electrolyte are the same. The present invention has found that when a solvent containing acetonitrile is used, the thermoelectric potential is significantly improved.

[0013] The intermediate layer electrolyte is separated from the positive and negative electrode electrolytes by ion exchange membranes to prevent the charge and discharge cycle life of the high thermoelectric potential positive and negative electrode electrolytes from being attenuated due to pH mismatch or redox ion crossover.

[0014] Furthermore, the mass fraction of acetonitrile in the mixture of acetonitrile and water is 0% to 100%, preferably 60% to 100%.

[0015] Furthermore, the redox couple OR(+)||OR(-) in the positive electrode electrolyte and the negative electrode electrolyte is selected from one of the following combinations: Fe 3+ / Fe 2+ (+)||Fe(CN)6 3- / Fe(CN)6 4- (-),Fe(CN)6 3- / Fe(CN)6 4- (+)||Zn / Zn 2+ (-), V 3+ / V 2+ (+)||Fe(CN)6 3- / Fe(CN)64- (-); wherein OR(+) is the redox couple of the positive electrode electrolyte, and OR(-) is the redox couple of the negative electrode electrolyte.

[0016] Furthermore, when the solvent is acetonitrile or a mixture of acetonitrile and water, the electrolyte of the positive electrode electrolyte is a mixed solution of Fe(ClO4)3 and Fe(ClO4)2; the electrolyte of the negative electrode electrolyte is a mixed solution of Li4Fe(CN)6 and Li4Fe(CN)6; and the electrolyte of the intermediate layer electrolyte is LiClO4. This electrolyte combination and the acetonitrile solvent can further increase the thermoelectric potential to 3.2-4.7mV / K.

[0017] Further, the concentration range of the positive electrode electrolyte is 0.1-1M, preferably 0.1-0.4M, the concentration range of the negative electrode electrolyte is 0.1-1M, preferably 0.1-0.4M; the concentration range of the intermediate layer electrolyte is 0.1-3M, preferably 1-3M. The concentration range of the redox couple in the positive and negative electrode electrolytes of the present invention can be determined by considering the electrolyte concentration and solubility at the same time, and is determined according to the relationship between the electrolyte concentration and the battery capacity, the electrolyte concentration and the battery thermoelectric potential, etc.

[0018] Furthermore, the concentration, storage volume or flow rate of the positive and negative electrode electrolytes and the intermediate layer electrolyte can be adjusted to optimize the energy conversion efficiency.

[0019] Furthermore, the electrolyte of the intermediate layer electrolyte is an alkali metal salt. In a preferred embodiment of the present invention, the alkali metal salt includes one of potassium chloride, sodium chloride, sodium sulfate, lithium chloride, lithium perchlorate, lithium sulfate, ammonium chloride and ammonium sulfate.

[0020] Furthermore, the positive and negative electrodes are selected from one of platinum sheets, graphite felt, carbon paper, carbon cloth materials, and carbon nanotubes.

[0021] Furthermore, the positive electrode electrolyte and the negative electrode electrolyte also include a co-solvent and / or a supporting electrolyte;

[0022] The co-solvent is an acidic co-solvent or an alkaline co-solvent, and the supporting electrolyte is a salt.

[0023] Furthermore, the acidic co-solvent includes hydrochloric acid, sulfuric acid and perchloric acid; the alkaline co-solvent includes one of potassium hydroxide, sodium hydroxide and lithium hydroxide; the supporting electrolyte includes one of potassium chloride, sodium chloride, sodium sulfate, lithium chloride, lithium sulfate and lithium perchlorate.

[0024] Furthermore, in the ion exchange membrane, when the carrier of the positive electrode electrolyte is a cation, a cation exchange membrane is used between the positive electrode electrolyte and the intermediate layer, otherwise an anion exchange membrane is used; similarly, when the carrier of the negative electrode electrolyte is a cation, a cation exchange membrane is used between the negative electrode electrolyte and the intermediate layer, otherwise an anion exchange membrane is used. In a preferred embodiment of the present invention, the cation exchange membrane includes but is not limited to the selection of Nafion series, Fumasep series and Selemion series and their treatment types, and the anion exchange membrane includes but is not limited to the selection of Fumasep series and Selemion series and their pre-treatment types. Preferably, both the anion and cation exchange membranes are soaked in the intermediate layer electrolyte for 1-48 hours before use.

[0025] Furthermore, the thermal regeneration electrochemical cycle battery is a static battery or a liquid flow battery; when the thermal regeneration electrochemical cycle battery is a liquid flow battery, the positive and negative electrodes of the battery are respectively provided with electrolyte flow channels to ensure efficient flow of the electrolyte.

[0026] Furthermore, the electrolyte flow channel is a serpentine flow channel, a comb-shaped flow channel or a spiral flow channel; the positive electrode electrolyte, the intermediate layer electrolyte, and the negative electrode electrolyte are respectively connected to the electrolyte storage tank to form an electrolyte circulation loop, and the flow rate of the electrolyte is controlled by a flow pump.

[0027] When using a liquid flow battery, the flow range of the positive and negative electrolytes in the present invention can be determined based on parameters such as the current density of the charge and discharge process, the concentration of the redox couple, and the consumed pump power. The electrolyte flow rate is usually selected to meet the maximum power density or efficiency of the battery.

[0028] The design method of the thermal regeneration electrochemical cycle battery of the present invention is:

[0029] Select matching positive and negative electrolytes, intermediate layer electrolytes, anion and cation exchange membranes, and set the parameters of the electrolytes. According to the sign of the battery thermoelectric potential and the set high and low temperatures, the battery is charged or discharged in sequence, and then the charge and discharge cycle is performed with the periodic change of the set battery temperature. Specifically, taking the static battery case where the battery thermoelectric potential is greater than 0 as an example, the battery is discharged at high temperature and charged at low temperature. The portion of electrical energy that is higher in high-temperature discharge than in low-temperature charging during the entire cycle is the total electrical work output by the battery. For flow batteries, a flow pump is used to facilitate the transfer of electrolyte between the battery and the storage tank.

[0030] In general, the above technical solution conceived by the present invention has the following technical advantages compared with the prior art:

[0031] 1. The double membrane structure proposed in the present invention can ensure the stable pairing between the positive and negative electrolytes with high thermoelectric potentials of different pH stability ranges and active material charge symbols, which can effectively improve the thermoelectric potential, power and efficiency of the TREC battery, maintain the battery capacity, and improve the battery's charge and discharge cycle life. It can solve the problem that the high thermoelectric potential and cycle stability of the TREC battery are difficult to achieve, so as to achieve high-performance stable operation of the TREC battery. At the same time, the present invention significantly improves the thermoelectric potential of the system by optimizing the composition of the electrolyte, thereby improving the energy collection and utilization effect.

[0032] 2. The present invention preferably uses a solvent containing acetonitrile to prepare the electrolyte. Studies have shown that this solvent can significantly increase the thermoelectric potential. When the positive electrode electrolyte is a mixed solution of Fe(ClO4)3 and Fe(ClO4)2, and the negative electrode electrolyte is a mixed solution of Li4Fe(CN)6 and Li4Fe(CN)6, the thermoelectric potential can reach a maximum of 4.7mV / K.

[0033] 3. The technical route of the present invention is universal. In addition to being applied to static batteries, it can also be used to construct flow batteries, thereby further improving the power and efficiency of TREC batteries and achieving effective recovery and utilization of low-grade heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the structure of the TREC static battery provided by the present invention.

[0035] Figure 2 It is a schematic diagram of the structure of the TREC flow battery provided by the present invention.

[0036] Throughout the drawings, the same reference numerals are used to denote the same elements or structures, wherein:

[0037] 1-current collector; 2-electrode; 3-negative electrode electrolyte or storage tank; 4-positive electrode electrolyte or storage tank; 5-intermediate layer electrolyte or storage tank; 6-anion exchange membrane; 7-cation exchange membrane; 8-load or power supply; 9-flow pump. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the 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. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] The present invention provides a thermal regeneration electrochemical cycle battery with a double membrane structure, the battery is composed of positive and negative electrodes 2 and a current collector 1, a positive electrolyte, a negative electrolyte, an intermediate layer electrolyte, an anion exchange membrane 6 and a cation exchange membrane 7. The positive and negative electrolytes contain two different redox pairs with opposite thermoelectric potentials; the intermediate layer electrolyte is composed of anion or cation carriers in the positive and negative electrolytes, and is located between the positive and negative electrolytes, and the intermediate layer electrolyte is separated from the positive and negative electrolytes by ion exchange membranes to prevent the positive and negative electrolytes with high thermoelectric potential from attenuating the charge and discharge cycle life due to pH mismatch or redox ion crossover. The solvents of the positive electrolyte, the intermediate layer electrolyte, and the negative electrolyte are acetonitrile, water, or a mixture of acetonitrile and water.

[0040] The thermal regeneration electrochemical cycle battery of the present invention can be a static battery or a flow battery, such as Figure 1 The schematic diagram of the TREC static battery structure. Figure 2 The schematic diagram of the structure of the liquid flow battery is shown in FIG. 1. When the liquid flow battery is used, it also includes an electrolyte storage tank and a flow pump 9 to form an electrolyte circulation loop, and the flow rate of the electrolyte is controlled by the flow pump.

[0041] Example 1: High thermoelectric potential organic all-iron TREC battery

[0042] The solvent of the electrolyte is pure acetonitrile, the positive electrode electrolyte is a mixed solution containing 0.1M Fe(ClO4)3 / Fe(ClO4)2, the negative electrode electrolyte is 0.1M Li3Fe(CN)6 / Li4Fe(CN)6, the middle layer electrolyte is 2M LiClO4, the anion exchange membrane Fumasep FAA-70 is used between the positive electrode electrolyte and the middle layer electrolyte, and the proton exchange membrane Nafion 115 is used between the negative electrode electrolyte and the middle layer electrolyte. The anion and cation exchange membranes are soaked in 1M LiClO4 solution for 24 hours before use, and the electrodes are graphite felt electrodes. The thermoelectric potential of the all-iron TREC battery constructed in this embodiment is 4.7mV / K.

[0043] Example 2: High thermoelectric potential organic all-iron TREC battery

[0044] The difference from Example 1 is that the solvent of the electrolyte is a mixture of acetonitrile and water, wherein the mass fraction of acetonitrile is 80%, and the rest is the same as Example 1, which will not be described again. The thermoelectric potential of the all-iron TREC battery constructed in this example is 4.2 mV / K.

[0045] Example 3: High thermoelectric potential organic all-iron TREC battery

[0046] The difference from Example 2 is that the positive electrode electrolyte uses a mixed solution containing 0.4M Fe(ClO4)3 / Fe(ClO4)2, and the negative electrode electrolyte uses 0.4M Li3Fe(CN)6 / Li4Fe(CN)6. The rest is the same as Example 2 and will not be repeated here. The thermoelectric potential range of the all-iron TREC battery constructed in this example is 3.5mV / K.

[0047] Example 4: High thermoelectric potential all-iron TREC battery

[0048] The difference from Example 1 is that the solvent of the electrolyte is water, and the rest is the same as Example 1, which will not be repeated here. The thermoelectric potential of the all-iron TREC battery constructed in this example is 3.1 mV / K.

[0049] Example 5: High thermoelectric potential, high capacity all-iron TREC battery

[0050] The solvent of the electrolyte is water, the positive electrode electrolyte uses a mixed solution containing 2.3M Fe(ClO4)3 / 1M HClO4, the negative electrode electrolyte uses 2.3M Li4Fe(CN)6, the middle layer electrolyte uses 3M LiClO4, the anion exchange membrane Fumasep FAA-70 is used between the positive electrode electrolyte and the middle layer electrolyte, and the proton exchange membrane Nafion 115 is used between the negative electrode electrolyte and the middle layer electrolyte. The anion and cation exchange membranes are soaked in 1M LiClO4 solution for 24 hours before use, and the electrodes use graphite felt electrodes. The thermoelectric potential of the all-iron TREC battery constructed in this embodiment is 3.2mV / K, and the theoretical capacity is as high as 61.6Ah / L.

[0051] Example 6: High Thermoelectric Potential Iron-Vanadium TREC Cell

[0052] The solvent of the electrolyte is water, the positive electrode electrolyte uses 0.4M K3Fe(CN)6 / K4Fe(CN)6, the negative electrode electrolyte uses a mixed solution containing 0.4M V2Cl3 / VCl2 / 2M H2SO4, the middle layer electrolyte uses 3M KCl, the proton exchange membrane Nafion 115 is used between the positive electrode electrolyte and the middle layer electrolyte, and the anion exchange membrane Selemion AMV is used between the negative electrode electrolyte and the middle layer electrolyte. The anion and cation exchange membranes are soaked in 1M KCl solution for 24 hours before use, and the electrodes are graphite felt electrodes. The thermoelectric potential of the all-iron TREC battery constructed in this embodiment is -3.1mV / K.

[0053] Example 7: Low-cost zinc-iron TREC battery

[0054] The solvent of the electrolyte is water, the positive electrode electrolyte uses 0.4M K3Fe(CN)6 / K4Fe(CN)6, the negative electrode electrolyte uses a mixed solution containing 0.4M ZnCl / 1M KCl, the middle layer electrolyte uses 3M KCl, the proton exchange membrane Nafion 115 is used between the positive electrode electrolyte and the middle layer electrolyte, and the anion exchange membrane Selemion AMV is used between the negative electrode electrolyte and the middle layer electrolyte. The anion and cation exchange membranes are soaked in 1M KCl solution for 24 hours before use, and the electrodes are graphite felt electrodes. The thermoelectric potential of the all-iron TREC battery constructed in this embodiment is -2.1mV / K.

[0055] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A thermal regeneration electrochemical cycle battery using a double membrane structure, characterized in that: It comprises a positive electrode, a positive electrode electrolyte, an intermediate layer electrolyte, a negative electrode electrolyte, a negative electrode, an anion exchange membrane and a cation exchange membrane; the positive electrode electrolyte and the negative electrode electrolyte are two different redox pairs with opposite thermoelectric potential signs; the cations of the intermediate layer electrolyte are selected from the cations of the positive electrode electrolyte, and the anions are selected from the anions of the negative electrode electrolyte, or the cations of the intermediate layer electrolyte are selected from the cations of the negative electrode electrolyte, and the anions are selected from the anions of the positive electrode electrolyte; When the cations of the intermediate layer electrolyte are the same as the cations of the positive electrode electrolyte, the intermediate layer electrolyte and the positive electrode electrolyte are separated by a cation exchange membrane, and the intermediate layer electrolyte and the negative electrode electrolyte are separated by an anion exchange membrane; When the anions of the intermediate layer electrolyte and the anions of the positive electrode electrolyte are the same, the intermediate layer electrolyte and the positive electrode electrolyte are separated by an anion exchange membrane, and the intermediate layer electrolyte and the negative electrode electrolyte are separated by a cation exchange membrane; The solvents of the positive electrode electrolyte, the intermediate layer electrolyte, and the negative electrode electrolyte are each independently selected from acetonitrile, water, or a mixture of acetonitrile and water.

2. The thermal regeneration electrochemical cycle battery according to claim 1, characterized in that: The redox couple OR(+)||OR(-) in the positive electrolyte and the negative electrolyte is selected from one of the following combinations: Fe 3+ / Fe 2+ (+)||Fe(CN)6 3- / Fe(CN)6 4- (-),Fe(CN)6 3- / Fe(CN)6 4- (+)||Zn / Zn 2+ (-), V 3+ / V 2+ (+)||Fe(CN)6 3- / Fe(CN)6 4- (-); wherein OR(+) is the redox couple of the positive electrode electrolyte, and OR(-) is the redox couple of the negative electrode electrolyte.

3. The thermal regeneration electrochemical cycle battery according to claim 2, characterized in that: When the solvent is acetonitrile or a mixture of acetonitrile and water, the positive electrode electrolyte is a mixed solution of Fe(ClO4)3 and Fe(ClO4)2; the negative electrode electrolyte is a mixed solution of Li3Fe(CN)6 and Li4Fe(CN)6; and the electrolyte of the intermediate layer electrolyte is LiClO4.

4. The thermal regeneration electrochemical cycle battery according to claim 3, characterized in that: The concentration range of the positive electrode electrolyte is 0.1-1M, the concentration range of the negative electrode electrolyte is 0.1-1M; and / or the concentration range of the intermediate layer electrolyte is 0.1-3M.

5. The thermal regeneration electrochemical cycle battery according to claim 1, characterized in that: The positive electrode electrolyte and the negative electrode electrolyte further include a co-solvent and / or a supporting electrolyte; The co-solvent is an acidic co-solvent or an alkaline co-solvent, and the supporting electrolyte is a salt.

6. The thermal regeneration electrochemical cycle battery according to claim 5, characterized in that: The acidic co-solvent includes one of hydrochloric acid, sulfuric acid, and perchloric acid; the alkaline co-solvent includes one of potassium hydroxide, sodium hydroxide, and lithium hydroxide; and the supporting electrolyte includes one of potassium chloride, sodium chloride, sodium sulfate, lithium chloride, lithium sulfate, and lithium perchlorate.

7. The thermal regeneration electrochemical cycle battery according to any one of claims 1 to 6, characterized in that: The thermal regeneration electrochemical cycle battery is a static battery or a liquid flow battery; when the thermal regeneration electrochemical cycle battery is a liquid flow battery, the positive electrode and the negative electrode of the battery are respectively provided with electrolyte flow channels.

8. The thermal regeneration electrochemical cycle battery according to claim 7, characterized in that: The electrolyte flow channel is a serpentine flow channel, a comb-shaped flow channel or a spiral flow channel; the positive electrode electrolyte, the intermediate layer electrolyte and the negative electrode electrolyte are respectively connected to the electrolyte storage tank to form an electrolyte circulation loop.

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