A thermoelectric chemical battery device and control method with integrated thermal storage function

Abstract

This invention discloses a thermoelectric chemical battery device and control method integrating thermal energy storage, belonging to the field of thermal energy storage and thermoelectric power generation technology. The thermoelectric chemical battery of this invention includes a heat-absorbing material, a phase change thermal energy storage device, a battery anode, a battery cavity, and a battery cathode; the battery anode acts as the hot electrode to drive the thermoelectric chemical reaction, and the battery cathode acts as the cold electrode of the thermoelectric chemical battery. This device combines the advantages of phase change thermal energy storage and, through a designed strategy, achieves a thermoelectric chemical battery device capable of efficiently recovering and utilizing various types of fluctuating waste heat. The battery's Seebeck coefficient can reach more than 10 times that of semiconductor thermoelectric materials. The thermoelectric chemical battery can generate high voltage under small temperature differences and has the advantage of a flexible structure. Through flexible design of the encapsulation structure and electrodes, it can adapt to waste heat sources with different surface shapes, and can utilize small temperature differences to extract heat from the environment, thus having a wide range of applications.

Description

Technical Field

[0001] This invention relates to a low-temperature waste heat power generation technology, specifically to a thermoelectric chemical battery device and control method with integrated heat storage function, belonging to the field of thermal energy storage and thermoelectric power generation technology. Background Technology

[0002] Currently, a large amount of energy is dissipated into the environment as low-grade waste heat. To achieve the goals of energy conservation and emission reduction, utilizing low-grade heat sources is crucial. At present, the utilization of low-grade heat sources is still mainly concentrated in domestic hot water, and it is relatively difficult to convert low-grade heat sources into a more universal energy form—electricity.

[0003] Utilizing low-grade waste heat to generate a temperature difference in thermoelectric cells can effectively convert this waste heat into electricity. Under different temperature conditions, the chemical equilibrium state of a reversible reaction varies. Therefore, the temperature difference in the electrolyte under open-circuit conditions leads to a difference in the equilibrium electrode potentials of the two electrodes, thus creating a potential difference. Taking the reversible reaction of ferricyanide and ferrous cyanide as an example, the higher the temperature, the lower the electrode potential. When a thermoelectric cell is connected to a load, a current is generated under the drive of the thermoelectric potential. Redox reactions occur at the electrodes of a thermoelectric cell; the products of the anode reaction are the reactants at the cathode, and vice versa. Therefore, as long as the temperature difference persists, the thermoelectric cell can continuously convert thermal energy into electrical energy. Efficiently converting industrial waste heat into electricity using the basic principles of thermoelectric cells is crucial. Summary of the Invention

[0004] To address the aforementioned issues, this invention proposes a geothermal chemical battery with integrated thermal storage function and a control method. This system utilizes phase change thermal storage to effectively mitigate the impact of industrial waste heat fluctuations on the operating state of the thermoelectric chemical battery. It efficiently converts industrial waste heat into electricity through methods such as controlling the thermal storage operation and transferring the overall device, eliminating the need for an external power source. The device is flexible, portable, and has a wide range of applications.

[0005] This invention first discloses a thermoelectric chemical battery device with integrated heat storage function, which includes heat-absorbing material, phase change heat storage device, battery anode, battery cavity, battery cathode, heat dissipation device and heat preservation device;

[0006] The heat-absorbing material is attached to one side of the phase change thermal storage device to collect external heat and transfer it to the phase change material inside the device. The phase change thermal storage device contains the phase change material and a heat exchange channel. The heat exchange channel can be circulated with a fluid containing waste heat to allow the phase change material to recover the waste heat from the fluid. The battery anode is bonded to the phase change thermal storage device with thermally conductive silicone. The heat stored in the phase change material can be transferred to the battery anode, allowing it to act as the hot electrode to drive the thermoelectric reaction. The battery cavity is filled with electrolyte. The battery anode and battery cathode are respectively located on opposite sides of the battery cavity and are both in contact with the electrolyte. The battery cathode serves as the cold electrode of the thermoelectric battery. The heat dissipation device is connected to the battery cathode to cool it. An overall insulation device serves as the outer shell of the thermoelectric battery device, enclosing it.

[0007] The overall insulation device has at least two controllable openings. One controllable opening is located at the heat-absorbing material to absorb external heat, and the second controllable opening is located at the heat dissipation device to dissipate heat from the battery's cold electrode.

[0008] If necessary, a third controllable opening can be provided at the phase change thermal storage device as an inlet for the fluid containing waste heat to enter the phase change thermal storage device.

[0009] As a preferred embodiment of the present invention, the controllable opening can be a window opened on the heat preservation device, which has a removable cover.

[0010] As a preferred embodiment of the present invention, the selection of electrode materials takes into account both cost and performance, and both the battery cathode and the battery anode are selected as porous graphite electrodes; the electrolyte is usually selected from those with a large temperature coefficient in the electrochemical reaction process, and potassium ferrocyanide / potassium ferricyanide redox solution is preferred.

[0011] In a preferred embodiment of the present invention, the electrolyte uses water or an ionic liquid as the solvent. The selection of the phase change material depends on the characteristics of the electrolyte. When water is used as the electrolyte, the melting point of the phase change material should not exceed 100°C, and materials with melting points not exceeding 100°C, such as sodium acetate trihydrate, palmitic acid, and paraffin, can be selected. When an ionic liquid is used as the solvent, the melting point of the phase change material can exceed 100°C, and organic phase change materials such as erythritol and mannitol, or inorganic phase change materials such as sodium nitrate and potassium nitrate, can be selected based on the boiling point of the ionic liquid. Considering the solution characteristics of potassium ferrocyanide / potassium ferrocyanide, paraffin is preferred as the phase change material in this device.

[0012] In a preferred embodiment of the present invention, the heat-absorbing material is a photovoltaic panel or a heat-collecting plate for collecting solar heat; the heat exchange channel is arranged in a curved manner within the phase change heat storage device to increase the heat exchange area with the phase change material; thermocouple measuring points are provided within the phase change heat storage device to monitor the internal temperature state of the phase change material, thereby enabling further control of the heat source and the thermoelectric cell. This heat storage device can overcome the problem of industrial waste heat fluctuations, achieve a stable supply of heat to the thermoelectric cell, and overcome the mismatch between the amount of heat and the power generation, storing excess heat to extend the power generation time.

[0013] In a preferred embodiment of the present invention, the battery anode and cathode are respectively connected to wires, which extend out of the heat preservation device; the wires leading out from the battery anode and cathode serve as the positive and negative terminals of the battery, respectively. When operation is required, simply connect the positive and negative terminals to an external load or an external power supply circuit to convert low-grade waste heat into electrical output. When the heat source quality decreases or electrical energy is not needed, disconnecting the external load or circuit and closing the controllable opening of the heat preservation device will put the entire system into heat preservation and dormancy.

[0014] As a preferred embodiment of the present invention, one side of the battery anode is in contact with the electrolyte, and the other side is tightly attached to the phase change heat storage device by thermally conductive adhesive; one side of the battery cathode is in contact with the electrolyte, and the other side is tightly attached to the heat dissipation device by thermally conductive adhesive.

[0015] As a preferred embodiment of the present invention, the battery anode and battery cathode are in the form of thin sheets; the battery cavity is a square cavity, the electrolyte fills the battery cavity, the battery anode and battery cathode are respectively located on opposite sides of the square cavity, and the two are arranged in parallel to each other, and the electrolyte is sealed by the wall of the battery cavity, the battery anode and the battery cathode.

[0016] As a preferred embodiment of the present invention, provided that the battery anode and battery cathode are parallel to each other and directly opposite each other, the battery anode and battery cathode can be arranged vertically relative to the horizontal plane, or horizontally relative to the horizontal plane, or inclined relative to the horizontal plane at any angle within 0-90°. That is, during operation, the entire thermoelectric chemical battery device can be rotated to the desired arrangement or angle.

[0017] This invention discovers that arranging the thermoelectric battery device in a specific manner or rotating the device to a certain angle can improve the battery's performance. Preferably, the battery anode and cathode are arranged perpendicular to the horizontal plane, or horizontally with the cathode at a higher position, or tilted relative to the horizontal plane with the cathode at a higher position. The tilt angle can be any angle between 0-90°, with 45° being the preferred angle. Experimental results show that placing the cathode at a higher position or tilting the electrode device to a certain extent can improve the Seebeck coefficient, power generation efficiency, and power of the thermoelectric battery. Therefore, when conditions permit, the device can be tilted and / or the cathode can be placed at a higher position to obtain better waste heat power generation.

[0018] The present invention also provides a control method for the aforementioned thermoelectric chemical cell, comprising the following steps:

[0019] Heat recovery is regulated according to the characteristics of the heat source. For contact heat sources or radiative heat sources, controllable openings are opened at the heat-absorbing material to allow the heat-absorbing material to come into close contact with the heat source or to absorb heat from the radiative heat source. The heat-absorbing material then transfers the absorbed heat to the phase change material. For fluid heat sources, the fluid is introduced into the heat exchange channel, and heat exchange with the phase change material is achieved through the heat exchange channel of the phase change heat storage device.

[0020] When the heat source is below 90°C, the temperature of the phase change material is measured in real time. After the temperature of the phase change material is completely stable, the battery anode and battery cathode are connected to the external circuit through wires to start continuous power supply.

[0021] When faced with a high-grade heat source with a temperature exceeding 90°C, intermittent operation is adopted. That is, when the temperature of the phase change material reaches about 90°C, the input of the heat source is stopped. At this time, the battery anode and cathode are connected to an external circuit through wires to start power supply. The heat is converted into electricity and the temperature of the phase change material is reduced. When the temperature of the phase change material drops to about 60°C, the heat source is reconnected. This intermittent operation achieves stable and efficient power production.

[0022] The advantages of this invention are:

[0023] (1) Through the thermo-electrochemical conversion process, low-grade waste heat can be converted into more universal electrical energy, which broadens the application prospects of low-grade waste heat recovery and utilization.

[0024] (2) Combining phase change thermal storage device and corresponding control method, the applicability of this device is broadened. It has good adaptability to various types of fluctuating / constant heat sources, and enhances the universality of thermoelectric chemical device application.

[0025] (3) Compared with conventional semiconductor thermoelectric materials, thermoelectric cells have a higher Seebeck coefficient, can generate electricity more efficiently, and have a flexible structure that can be used in a variety of situations.

[0026] (4) The tilted arrangement method described in this invention can further improve the performance of thermoelectric chemical cells and accelerate their application. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the basic structure of a thermoelectric chemical cell.

[0028] Figure 2 This is a schematic diagram of the internal structure of a phase change thermal energy storage device.

[0029] Figure 3 A schematic diagram illustrating the performance gains achievable with a transposition thermoelectrochemical cell;

[0030] Figure 4 This is a basic structural diagram of a thermoelectric chemical cell (tilted, with the cold electrode on top).

[0031] Figure 5 This is a schematic diagram of the basic structure of a thermoelectric chemical cell (90°).

[0032] In the figure, 1 is the heat-absorbing material; 2 is the phase change heat storage device; 3 is the anode; 4 is the battery cavity; 5 is the reducing agent; 6 is the oxidizing agent; 7 is the electrolyte; 8 is the cathode; 9 is the heat dissipation device; 10 is the battery circuit; 11 is the overall heat preservation device; 12 is the controllable opening of the heat preservation device; 13 is the controllable opening; 14 is the phase change material; 15 is the heat exchange channel; 16 is the pipe inlet; 17 is the pipe outlet; and 18 is the thermocouple measuring point. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0034] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0035] Furthermore, in this invention, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly defined.

[0036] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] As attached Figure 1 , 4 As shown in Figure 5, this invention proposes a thermoelectric chemical battery device and control method with integrated heat storage function. The device includes a heat-absorbing material 1; a phase change heat storage device 2; an anode 3; a battery cavity 4; a cathode 8; a heat dissipation device 9; and an overall heat preservation device 11. This device utilizes the phase change heat storage device 2 to effectively mitigate the impact of industrial waste heat fluctuations on the working state of the thermoelectric chemical battery. It can efficiently convert industrial waste heat into electricity through methods such as controlling the heat storage working mode and repositioning the overall device, eliminating the need for an external power source. The device is flexible, portable, and has a wide range of applications.

[0038] Specifically, in this device, the heat-absorbing material 1 is closely attached to one side of the phase change heat storage device 2, and the two can be connected by thermally conductive adhesive. Heat from the waste heat source can be transferred to the phase change material for storage through the wall surface, and the properties of the phase change material overcome fluctuations in industrial waste heat during this process. The phase change heat storage device 2 contains a phase change material 14 and a heat exchange channel 15. The phase change material 14 is used to store heat and regulate heat output; the heat exchange channel 15 is used to collect waste heat from the fluid; the fluid carrying waste heat enters from the pipe inlet 16 and flows out from the pipe outlet 17. Thermocouple measuring points 18 help monitor the internal temperature state of the phase change material, thereby enabling further control of the heat source and thermoelectric cell. This heat storage device can overcome the problem of industrial waste heat fluctuations, achieving a stable supply of heat to the thermoelectric cell, and can also overcome the mismatch between the amount of heat and the power generation, storing excess heat to extend the power generation time.

[0039] The phase change thermal storage device 2 is attached to the anode 3 of the battery. This allows the heat from the phase change material to be transferred to the battery anode, i.e., the hot electrode of the thermoelectric cell. With the help of residual heat, a temperature difference is formed between the hot and cold electrodes. In the open-circuit state, this temperature difference in the electrolyte leads to a difference in the equilibrium electrode potentials of the two electrodes, thus generating a potential difference. Taking the reversible reaction of ferricyanide and ferrous cyanide as an example:

[0040]

[0041] Potassium ferrocyanide (reducing agent 5) is oxidized at the anode (thermal electrode) to form potassium ferrocyanide; potassium ferrocyanide (oxidizing agent 6) moves to the cathode (cold electrode) in the electrolyte via mass transfer, where it is reduced to potassium ferrocyanide. Potassium ferrocyanide then moves to the anode via mass transfer in the electrolyte. It should be noted that this invention preferably uses the interconversion of ferricyanide and ferrocyanide as a method for power generation (as shown in the appendix). Figure 3 (As shown), other similar reaction options should be within the scope of protection of this invention. Regarding the interconversion of ferricyanide and ferrousyanide, the higher the temperature, the lower the electrode potential. When a thermoelectric cell is connected to a load, a thermoelectric potential is generated between the hot and cold electrodes. Driven by this potential difference, a current is generated in the external circuit. This process is based on... Figure 1 The battery is constructed using a cavity, a hot electrode, and a cold electrode. The cold electrode is in contact with the electrolyte, and a heat dissipation device is located below it to maintain the cold electrode at a relatively low temperature. This ensures a temperature difference between the hot and cold electrodes, driving the thermoelectrochemical conversion process more efficiently.

[0042] Furthermore, the battery anode 3 and battery cathode 8 are respectively connected by wires, which pass through the insulation device; the wires leading out from the battery anode 3 and battery cathode 8 serve as the positive and negative terminals of the battery, respectively. Energy can be output through an external circuit when needed. When the heat source quality is low or the quantity is insufficient for power generation, the external circuit can be disconnected to prevent the thermoelectric chemical battery from outputting energy, thus keeping the entire device in a state of insulation and heating. The circuit can be re-closed at the appropriate time to resume energy output. Simultaneously, the device has an external insulation device to ensure that energy is not wasted during heat collection and to control overall energy loss when the circuit is disconnected. Rotation can improve the performance of the device. Figure 1 The diagram also shows the device after rotation, illustrating the gain effect resulting from different rotation angles. Figure 3 It is displayed in the middle.

[0043] This invention discloses the contents of the phase change thermal storage device, as shown in the appendix. Figure 2As shown, phase change material (PCM) is filled in a PCM thermal storage device to absorb heat from various types of industrial waste heat. A serpentine flow path is arranged within the PCM thermal storage device to recover heat contained in fluids such as industrial exhaust gases. Simultaneously, a series of thermocouple measuring points are arranged within the PCM thermal storage device to monitor the internal temperature of the PCM. Based on the energy storage status reflected by the internal temperature of the PCM, the operation of the thermoelectric cell can be controlled, and the input of the heat source can be adjusted.

[0044] In this embodiment, both the battery cathode and the battery anode are made of porous graphite electrodes, and the battery anode and the battery cathode are in the form of thin sheets. The battery cavity is a square cavity, and the electrolyte fills the battery cavity. The battery anode and the battery cathode are located on opposite sides of the square cavity, and are arranged in parallel to each other. The electrolyte is sealed by the wall of the battery cavity, the battery anode and the battery cathode.

[0045] Furthermore, this invention provides a more preferred battery arrangement. Based on experimental results, this invention proposes that by adjusting the entire rotating device to a suitable angle, a larger Seebeck coefficient and higher conversion efficiency can be obtained, resulting in better thermoelectric conversion performance. This method is derived through a comprehensive analysis of relevant experimental results. To clarify the description of the rotating device, [the following is omitted as it is not part of the main text]. Figure 1 The state shown, with the hot electrode facing upwards and the cold electrode facing downwards, is defined as 0°. For example... Figure 3 As shown in the bar graph, after rotating the entire device counterclockwise to a suitable angle, the changes in the Seebeck coefficient and power density of the thermoelectric cell are illustrated. When rotated counterclockwise by 45°, 90°, 135°, and 180°, the Seebeck coefficient and maximum power of the cell compared to... Figure 1 All increased significantly. Especially when rotated counterclockwise by 90°, 135°, and 180°, the Seebeck coefficient and maximum power of the battery increased significantly. Specifically, a 90° counterclockwise rotation corresponds to a state where the battery anode and cathode are vertically positioned relative to the horizontal plane, as shown in the schematic diagram below. Figure 5 As shown. A 135° counterclockwise rotation corresponds to the battery anode and cathode being arranged at a 45° angle relative to the horizontal plane, with the cathode at a higher position. A schematic diagram of this structure is shown below. Figure 4 As shown, rotating counterclockwise by 180° corresponds to the battery anode and cathode being arranged horizontally relative to the horizontal plane, with the battery cathode in a higher position.

[0046] When the device is rotated counterclockwise 135° to achieve Figure 4 In the state shown (where the cold electrode is on top and the hot electrode is on the bottom, and the acute angles between the cold and hot electrodes and the horizontal plane are both 45°), the Seebeck coefficient S of the battery is... eThe power of the thermochemical device increased from 1.46 mV / K to 1.73 mV / K. In addition, the maximum power P of the thermochemical device... max From 0.025W / m 2 Increased to 0.211W / m 2 This represents an improvement of nearly tenfold. This means that, under suitable conditions, adjusting the device's rotational settings could further enhance the performance of the thermochemical conversion.

[0047] Regarding heat conversion, this invention regulates heat recovery based on the characteristics of the heat source. For fluid-type heat sources, such as industrial waste heat, heat exchange can be achieved through the flow channels of the phase change heat storage device 2. For contact-type waste heat sources, such as waste heat generated by photovoltaic power generation, the heat-absorbing material 1 can be bonded to the heat source and then transferred to the phase change material. Furthermore, when dealing with relatively low-grade heat sources (e.g., photovoltaic waste heat of 40-60 degrees Celsius), based on the temperature monitoring results of the thermocouple measuring points in the phase change heat storage device, the external circuit is closed and operation begins after the temperature of the phase change material has completely stabilized. When the temperature of the heat source used is high (such as industrial exhaust gas at 100-200 degrees Celsius), intermittent operation measures can be taken. When the phase change material reaches about 90 degrees Celsius, the input of the waste heat source is stopped, and the external circuit starts to work, converting heat into electricity and reducing the temperature of the phase change material, thereby preventing the electrolyte from overheating and evaporating. When the temperature of the phase change material drops to about 60 degrees Celsius, the heat source is reconnected. This intermittent operation achieves stable and efficient power production.

[0048] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A thermoelectric chemical battery device with integrated heat storage function, characterized in that, It includes heat-absorbing material (1), phase change heat storage device (2), battery anode (3), battery cavity (4), battery cathode (8), heat dissipation device (9) and heat preservation device (11). The heat-absorbing material (1) is attached to one side of the phase change heat storage device (2) to collect external heat and transfer it to the phase change material inside the phase change heat storage device. The phase change heat storage device is equipped with a phase change material and a heat exchange channel. The heat exchange channel can be circulated with a fluid with residual heat to realize the recovery of the fluid's residual heat by the phase change material. The battery anode is bonded to the phase change heat storage device through thermally conductive silicone. The heat stored in the phase change material can be transferred to the battery anode to drive the thermoelectrochemical reaction as a hot electrode. The battery cavity is filled with electrolyte. The battery anode and battery cathode are respectively arranged on opposite sides of the battery cavity and are in contact with the electrolyte. The battery cathode serves as the cold electrode of the thermoelectrochemical battery. The heat dissipation device is connected to the battery cathode to cool the battery cathode. The overall insulation device serves as the outer shell of the thermoelectric chemical battery device, enclosing the thermoelectric chemical battery device. At least two controllable openings are arranged on the overall heat insulation device. One controllable opening is opened at the heat-absorbing material (1) for the heat-absorbing material (1) to absorb external heat. The second controllable opening is set at the heat dissipation device (9) for the heat dissipation device (9) to dissipate the heat of the battery cold electrode. The battery anode (3) and battery cathode (8) are respectively connected to wires, and the wires pass through the overall heat preservation device; The wires leading out from the battery anode (3) and the battery cathode (8) serve as the positive and negative terminals of the battery, respectively. The battery anode and cathode are arranged horizontally relative to the horizontal plane with the cathode at a higher position, or the battery anode and cathode are arranged at an angle relative to the horizontal plane with the cathode at a higher position, and the angle of inclination is any angle within 0-90°.

2. The thermoelectric chemical battery device with integrated thermal storage function according to claim 1, characterized in that, Both the cathode and anode of the battery are made of porous graphite electrodes; the electrolyte is a potassium ferrocyanide / potassium ferricyanide redox solution.

3. The thermoelectric chemical battery device with integrated thermal storage function according to claim 2, characterized in that, The electrolyte is made of water or an ionic liquid. When the electrolyte is made of water, the melting point of the phase change material does not exceed 100°C. When the electrolyte is made of an ionic liquid, the melting point of the phase change material exceeds 100°C.

4. The thermoelectric chemical battery device with integrated thermal storage function according to claim 1, characterized in that... The heat-absorbing material (1) is a photovoltaic panel or a heat-collecting plate for collecting solar heat; the heat exchange channel is arranged in a curved manner in the phase change heat storage device to increase the heat exchange area with the phase change material; thermocouple measuring points are set in the phase change heat storage device to monitor the internal temperature state of the phase change material.

5. The thermoelectric chemical battery device with integrated thermal storage function according to claim 1, characterized in that, The battery anode (3) is in contact with the electrolyte on one side and is tightly attached to the phase change heat storage device (2) on the other side by thermally conductive adhesive; the battery cathode (8) is in contact with the electrolyte on one side and is tightly attached to the heat dissipation device (9) on the other side by thermally conductive adhesive.

6. The thermoelectric chemical battery device with integrated thermal storage function according to claim 1, characterized in that, The battery anode (3) and battery cathode (8) are in the form of sheets; the battery cavity (4) is a square cavity, and the electrolyte fills the battery cavity. The battery anode (3) and battery cathode (8) cover the opposite sides of the square cavity respectively, and the two are arranged in parallel to each other. The electrolyte is sealed by the wall of the battery cavity, the battery anode (3) and the battery cathode (8).

7. A control method for a thermoelectric chemical cell according to any one of claims 1-6, characterized in that... Includes the following steps: Heat recovery is regulated according to the characteristics of the heat source. For contact heat sources or radiative heat sources, controllable openings are opened at the heat-absorbing material to allow the heat-absorbing material to come into close contact with the heat source or to absorb heat from the radiative heat source. The heat-absorbing material then transfers the absorbed heat to the phase change material. For fluid heat sources, the fluid is introduced into the heat exchange channel, and heat exchange with the phase change material is achieved through the heat exchange channel of the phase change heat storage device. When the heat source is below 90°C, the temperature of the phase change material is measured in real time. After the temperature of the phase change material is completely stable, the battery anode (3) and battery cathode (8) are connected to the external circuit through wires to start continuous power supply. When faced with a high-grade heat source with a temperature higher than 90°C, intermittent operation is adopted. That is, when the temperature of the phase change material reaches 90°C, the input of the heat source is stopped. At this time, the battery anode (3) and the battery cathode (8) are connected to the external circuit through wires to start power supply. The heat is converted into electricity and the temperature of the phase change material is reduced. When the temperature of the phase change material drops to 60°C, the heat source is reconnected. Such intermittent operation achieves stable and efficient power production.

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