A method of fabricating a thermoelectric battery integrated device

Abstract

The application discloses a kind of preparation thermoelectric battery integrated device, specifically includes the following steps: S1, preparation thermoelectric material;S2, thermoelectric material and the assembly in battery interior;S3, the packaging of thermoelectric battery integrated device;The application relates to the field of energy conversion technology.The preparation thermoelectric battery integrated device method, through the setting of thermoelectric battery integrated device, the heat generated in the battery working process can be converted into new electric energy to supply battery reuse, improve battery service life, while saving energy, green environmental protection, and in the process of conversion, thermoelectric material can absorb excess waste heat, effectively prevent the occurrence of explosion danger, the heat generated in the battery working process is converted into electric energy by thermoelectric material, and the battery is powered again through the connection of wire, improve the energy utilization rate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy conversion, in particular to a method for preparing a thermoelectric battery integrated device. BACKGROUND

[0002] Thermoelectric devices convert heat energy and electric energy through the movement of charge carriers, which can efficiently convert the temperature difference of a living body or a device surface into electric energy, and can also achieve temperature control through electric energy. Thermoelectric devices have outstanding characteristics such as energy saving and environmental protection, stable performance, sustainable output, and are one of the technologies that can solve energy shortages. Batteries, as traditional energy storage devices, generate a large amount of waste heat during discharge, which often leads to the occurrence of battery side reactions, resulting in battery failure. The heat accumulated in the battery cannot be discharged, which may cause explosion.

[0003] Based on the search of the above-mentioned materials, it can be seen that the existing technology does not effectively utilize the waste heat generated during the discharge of the battery, and there is a risk of explosion. Based on this, a method for preparing a thermoelectric battery integrated device is proposed. The current collector prepared from thermoelectric material is combined with the battery to assemble a thermoelectric battery device, which has the characteristics of environmental protection, high safety, and long service life, and can stably and continuously power small electronic devices. SUMMARY

[0004] (I) Technical problems solved

[0005] In view of the deficiencies of the prior art, the present application provides a method for preparing a thermoelectric battery integrated device, which solves the problem that the waste heat generated during the discharge of the battery is not effectively utilized in the prior art, and there is a risk of explosion.

[0006] (II) Technical solutions

[0007] To achieve the above purpose, the present application is realized by the following technical solutions: a method for preparing a thermoelectric battery integrated device, specifically comprising the following steps:

[0008] S1, preparing a thermoelectric material;

[0009] S2, assembling the thermoelectric material with the battery: cutting the thermoelectric material into two regular rectangular strips, connecting the rectangular strips through two insulating layers to form a thermoelectric device current collector;

[0010] S3, the packaging of the thermoelectric battery integrated device: placing the positive and negative electrodes inside the thermoelectric device current collector, separating the positive and negative electrodes from the thermoelectric device current collector with a polyethylene film, then placing the battery electrolyte inside the thermoelectric device current collector, leading a wire from the positive and negative electrodes to the load for power supply, the end of the thermoelectric device current collector in contact with the outside world as the cold end, and the end in contact with the positive and negative electrodes as the hot end, leading a wire from the outer surface of the thermoelectric device current collector and another wire inside the battery at the hot end to the two ends of the capacitor, adding a bidirectional switch between the load and the capacitor, and obtaining the thermoelectric battery integrated device;

[0011] When the bidirectional switch is connected to the load, the thermoelectric battery integrated device is charging the capacitor, that is, the discharging process of the thermoelectric battery integrated device;

[0012] When the bidirectional switch is connected to the capacitor, the capacitor is charging the thermoelectric battery integrated device.

[0013] The application further provides that the thermoelectric material is one of an organic thermoelectric hydrogel and an inorganic thermoelectric film.

[0014] The application further provides that the organic thermoelectric hydrogel comprises a polymer added with a metal ion solution.

[0015] The metal ion solution is one of potassium ferricyanide / potassium ferrocyanide, a sulfate, a sulfite, sodium chloride and sodium hydroxide.

[0016] The polymer is one or more of sodium alginate, polyacrylamide, polyethylene glycol and polyvinyl alcohol.

[0017] The application further provides that the preparation method of the organic thermoelectric hydrogel comprises:

[0018] The polymer is dissolved by using a water bath heating method, the metal ion solution is then added, the mold is poured, and a freeze-thaw thawing technique is used for processing, repeated three times, to obtain the organic thermoelectric hydrogel.

[0019] The temperature of the freeze-thaw freezing method is -150 ℃-10 ℃, and the time is 1-30 h.

[0020] The application further provides that the preparation material of the inorganic thermoelectric film comprises a sulfur compound and a carbon material.

[0021] The sulfur compound is one of bismuth telluride, silver selenide and bismuth selenide.

[0022] The carbon material is one of carbon nanotubes and graphene.

[0023] The application further provides that the preparation method of the inorganic thermoelectric film comprises:

[0024] The sulfide compound nanostructure is synthesized by a hydrothermal method, the sulfide compound nanostructure and carbon material are fully mixed in proportion to obtain a composite nano material powder, the composite nano material powder is inverted to a mold, and cold pressing or hot pressing is performed to form, and after annealing treatment, a sulfide compound thermoelectric film is obtained.

[0025] The application is further provided as follows: the hydrothermal synthesis temperature is 100-800 DEG C, the hot pressing temperature is 50-1000 DEG C, the pressure is 1-150 MPa, and the time is 5-600 min.

[0026] The application is further provided as follows: the cold pressing temperature is room temperature, and the pressure is 1-50 MPa.

[0027] The annealing treatment temperature is 100-1000 DEG C, and the time is 30-600 min.

[0028] The application is further provided as follows: the size of the organic thermoelectric hydrogel and the inorganic thermoelectric film in S2 is cut to 2-10 cm in length and 2-10 cm in width.

[0029] The application is further provided as follows: the insulation layer is one or more of polyethylene, silicone rubber and mica.

[0030] (Three) beneficial effects

[0031] The application provides a method for preparing a thermoelectric battery integrated device.

[0032] (1) The application can convert the heat generated in the battery working process into new electric energy to supply the battery for reuse, improve the battery service life, save energy, and be green and environmentally friendly, and the thermoelectric material can absorb the excess waste heat in the conversion process, effectively preventing the occurrence of explosion hazards.

[0033] (2) The application converts the heat generated in the battery working process into electric energy through the thermoelectric material, and supplies the battery with power through the connection of the lead, thereby improving the energy utilization rate. DETAILED DESCRIPTION

[0034] Figure 1 The figure is a preparation flowchart of the application;

[0035] Figure 2 The figure is a structure diagram of the thermoelectric battery integrated device of the application;

[0036] In the figure, A is an insulation layer; B is a hot end; C is a positive and negative electrode; D is a thermoelectric material; E is a cold end; F is a battery electrolyte; G is a load; H is a capacitor; and I is a polyethylene film.

[0037] Figure 3 Figure 1 is a schematic diagram of the performance of inorganic thermoelectric materials in the embodiment of the present application;

[0038] Figure 4 Figure 3 is a schematic diagram of the performance of organic thermoelectric materials in the embodiment of the present application;

[0039] Figure 5 Figure 4 is the cycle performance of the thermoelectric battery integrated device at a current of 5 mA in the embodiment of the present application. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.

[0041] Please refer to Figures 1-5 The technical solutions provided by the embodiments of the present application are as follows:

[0042] Embodiment one,

[0043] A method for preparing a thermoelectric battery integrated device, specifically comprising the following steps:

[0044] Step 1: Synthesizing silver selenide nanostructures by using a hydrothermal method, the reaction temperature of the hydrothermal method is 100 ℃, and the time length is 200 min, the product is cleaned by using deionized water and anhydrous ethanol alternately for 20 times, the centrifugal speed is 10000 rpm, and the time is 2 min, and the obtained product is dispersed in anhydrous ethanol again;

[0045] Step 2: Dispersing carbon nanotubes in the above solution, stirring at 40 ℃, the stirring speed is 500 rpm, the time is 4 h, the molar mass ratio of silver selenide to carbon nanotubes is 4:1, and a composite product silver selenide / carbon nanotube is obtained;

[0046] Step 3: Homogenizing the composite product silver selenide / carbon nanotube by ultrasonic treatment for 2 hours, then vacuum filtering the composite product silver selenide / carbon nanotube on a nylon porous filter membrane, drying the prepared thermoelectric film in a vacuum oven at 80 ℃ for 12 h, then performing cold pressing annealing treatment on the inorganic thermoelectric film, cold pressing for 10 min at 20 MPa, and finally annealing at 200 ℃ for 30 min in an argon atmosphere;

[0047] Step 4: Cutting the silver selenide thermoelectric film into two strips with a length of 5 cm and a width of 5 cm, connecting the two thermoelectric films by using an insulating layer material to form a thermoelectric device current collector;

[0048] Step 5: Placing the positive and negative electrodes of the battery inside the thermoelectric device current collector, separating the positive and negative electrodes of the battery from the thermoelectric device current collector by using a polyethylene film, and placing the required battery electrolyte therein;

[0049] Step 6: Lead wires are drawn from the positive and negative electrodes to the load for power supply, and the end of the thermoelectric device current collector in contact with the outside world is the cold end, and the end in contact with the positive and negative electrodes of the battery is the hot end. A lead wire is drawn from the outer surface of the thermoelectric device current collector with silver paste and another lead wire is drawn inside the battery as the hot end, which are connected together to the two ends of the capacitor. A bidirectional switch is added between the load and the capacitor to obtain a thermoelectric battery integrated device. When the bidirectional switch is connected to the load, the thermoelectric battery integrated device is charging the capacitor, i.e. the discharging process of the thermoelectric battery integrated device. When the bidirectional switch is connected to the capacitor, the capacitor is charging the thermoelectric battery integrated device.

[0050] Example Two,

[0051] A method for preparing a thermoelectric battery integrated device, specifically comprising the following steps:

[0052] Step 1: Dissolve 10 wt % polyvinyl alcohol using a water bath heating method, water bath heating reaction temperature: 80 ℃, time: 120 min, then add sodium hydroxide solution for reaction, reaction temperature: 100 ℃, reaction time: 12 h, molar ratio of polyvinyl alcohol: sodium hydroxide 1:0.9, to obtain a polyvinyl alcohol-sodium hydroxide solution;

[0053] Step 2: Put the polyvinyl alcohol-sodium hydroxide solution into an ultrasonic instrument to eliminate bubbles by ultrasonic, ultrasonic time: 10 min, repeat 2-3 times, then pour the solution into a square mold with a length of 10 cm and a width of 10 cm;

[0054] Step 3: Freeze the mold at -20 ℃ for 24 h and thaw at room temperature for 2 h, repeat three times to prepare a freeze-thawed polyvinyl alcohol-sodium hydroxide hydrogel;

[0055] Step 4: Further dry annealing treatment of the freeze-thawed polyvinyl alcohol-sodium hydroxide hydrogel, reaction temperature: 100 ℃, controlled time: 10 min, finally, cool the dry annealed polyvinyl alcohol-sodium hydroxide hydrogel at room temperature, then immerse it in water for 30 min to reach its equilibrium swelling;

[0056] Step 5: Cut the polyvinyl alcohol-sodium hydroxide hydrogel into two strips with a length of 5 cm and a width of 5 cm, connect the two organic organic thermoelectric hydrogels with an insulating layer material to form a thermoelectric device current collector;

[0057] Step 6: Place the positive and negative electrodes of the battery inside the thermoelectric device current collector, and separate the positive and negative electrodes of the battery from the thermoelectric device current collector with a polyethylene film, and put the required battery electrolyte into it;

[0058] Step 7: Lead wires are drawn from the positive and negative electrodes to the load for power supply, and the end of the thermoelectric device current collector in contact with the outside world is used as the cold end, and the end in contact with the positive and negative electrodes of the battery is used as the hot end. A lead wire is drawn from the outer surface of the thermoelectric device current collector with silver paste, and another lead wire is drawn inside the battery as the hot end, which are connected together to the two ends of the capacitor. A bidirectional switch is added between the load and the capacitor to obtain a thermoelectric battery integrated device. When the bidirectional switch is connected to the load, the thermoelectric battery integrated device is charging the capacitor, i.e., the discharging process of the thermoelectric battery integrated device. When the bidirectional switch is connected to the capacitor, the capacitor is charging the thermoelectric battery integrated device.

[0059] Example Three,

[0060] A method for preparing a thermoelectric battery integrated device, specifically comprising the following steps:

[0061] Step 1: Dissolve 10 wt % polyvinyl alcohol (PVA) using a water bath heating method, with a solvent of 3 wt % polystyrene sulfonic acid aqueous solution, a reaction temperature of 80 ℃, and a reaction time of 120 min. Stir at 95 ℃ for 2 h at a stirring speed of 180 rpm to obtain solution 1.

[0062] Step 2: Dissolve the sulfate and sulfite solutions in a stoichiometric ratio of 1:1 in deionized water at a concentration of 0.1 mol / L. After adding a solvent of 7% dimethyl sulfoxide aqueous solution, stir thoroughly to obtain solution 2.

[0063] Step 3: Mix solution 1 with solution 2 and stir at a temperature of 90 ℃ for 60 min to obtain solution 3. Pour solution 3 into a square mold with a length of 10 cm and a width of 10 cm.

[0064] Step 4: Place the mold in a -20 ℃ environment for gelation for 24 h, and then crystallize and thaw at room temperature for 4 h. After polymerization, repeat the freeze / thaw cycle treatment of the hydrogel three times to form PVA-SO 4 / 3 2- Hydrogel;

[0065] Step 5: Cut the PVA-SO 4 / 3 2- Hydrogel into two strips with a length of 5 cm and a width of 5 cm, and connect the two organic thermoelectric films with an insulating layer material to form a thermoelectric device current collector.

[0066] Step 6: Place the positive and negative electrodes of the battery inside the thermoelectric device current collector, and separate the positive and negative electrodes of the battery from the thermoelectric device current collector with a polyethylene film. The required battery electrolyte is placed inside.

[0067] Step 7: from the positive and negative lead to the load power supply, and the thermoelectric device current collector with the outside contact as the cold end, and the positive and negative contact of the battery as the hot end, from the outer surface of the thermoelectric device current collector with silver paste to lead out a wire and another wire inside the battery as the hot end to connect to the two ends of the capacitor, a bidirectional switch is added between the load and the capacitor, and a thermoelectric battery integrated device is obtained. When the bidirectional switch is connected to the load, the thermoelectric battery integrated device is charged by the capacitor, that is, the discharging process of the thermoelectric battery integrated device. When the bidirectional switch is connected to the capacitor, the capacitor is charged to the thermoelectric battery integrated device.

Claims

1. A method of making a thermoelectric battery integrated device, characterized by: Specifically comprising the following steps: S1, preparing thermoelectric material; S2, assembling thermoelectric material with battery: cutting the thermoelectric material into two regular rectangular strips, connecting the two strips through two insulating layers to form a thermoelectric device current collector; S3, packaging of thermoelectric battery integrated device: placing the positive and negative electrodes inside the thermoelectric device current collector, separating the positive and negative electrodes from the thermoelectric device current collector with polyethylene film, then putting the battery electrolyte into the thermoelectric device current collector, leading a wire from the positive and negative electrodes to the load for power supply, the end of the thermoelectric device current collector contacting the outside world as the cold end, and the end contacting the positive and negative electrodes as the hot end, leading a wire from the outer surface of the thermoelectric device current collector and another wire from the battery inside the hot end to the two ends of the capacitor, adding a bidirectional switch between the load and the capacitor, and obtaining the thermoelectric battery integrated device; When the bidirectional switch connects the load, it is the charging process of the thermoelectric battery integrated device, i.e. the discharging process of the thermoelectric battery integrated device; When the bidirectional switch connects the capacitor, it is the charging process of the thermoelectric battery integrated device; The thermoelectric material is one of organic thermoelectric hydrogel and inorganic thermoelectric film; The organic thermoelectric hydrogel comprises a polymer added with a metal ion solution; The metal ion solution is one of potassium ferricyanide / potassium ferrocyanide, sulfate, sulfite, sodium chloride and sodium hydroxide; The polymer is one or more of sodium alginate, polyacrylamide, polyethylene glycol and polyvinyl alcohol; The preparation material of the inorganic thermoelectric film comprises a chalcogenide and a carbon material; The chalcogenide is one of bismuth telluride, silver selenide and bismuth selenide; The carbon material is one of carbon nanotube and graphene.

2. The method of claim 1, wherein: The preparation method of the organic thermoelectric hydrogel comprises: Dissolving the polymer by water bath heating method, then adding the metal ion solution, pouring the mold, and then treating by freeze-thaw thawing technology for three times to obtain the organic thermoelectric hydrogel; The temperature of the freeze-thaw freezing method is-150 ℃-10 ℃, and the time is 1-30 h.

3. The method of claim 1, wherein: The preparation method of the inorganic thermoelectric film comprises: Synthesizing chalcogenide nanostructure by hydrothermal method, fully mixing the chalcogenide nanostructure and the carbon material according to the proportion to obtain composite nanometer material powder, pouring the mold after the composite nanometer material powder, and then cold pressing or hot pressing to form, annealing treatment to obtain chalcogenide thermoelectric film.

4. A method of fabricating a thermoelectric battery integrated device according to claim 3, wherein: The temperature of the hydrothermal method is 100-800 ℃, the hot pressing temperature is 50-1000 ℃, the pressure is 1-150 MPa, and the time is 5-600 min.

5. The method of claim 3, wherein: The temperature of the cold pressing is room temperature, and the pressure is 1-50 MPa; The annealing treatment temperature is 100-1000 ℃, and the time is 30-600 min.

6. The method of claim 1, wherein: The size of the thermoelectric material cut in S2 is: 2-10 cm long and 2-10 cm wide.

7. The method of claim 1, wherein: The insulating layer is one or more of polyethylene, silicone rubber and mica.

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