A reflective and concentrating high-performance isotope thermophotovoltaic cell and its preparation method

Abstract

The present invention discloses a reflective focusing high-performance isotope thermal photovoltaic cell and a preparation method thereof, which belongs to the field of isotope batteries and solves the problem of low energy conversion efficiency of existing photovoltaic cells. The present invention comprises an outer shell, in which an isotope heat source assembly, a heat radiator, a photon filter and a photoelectric assembly are arranged, a crossbeam reflection baffle surrounds the inner wall of the outer shell and is installed in the middle of the outer shell, and the end surface reflection baffles are respectively installed on the inner sides of the upper end plate and the lower end plate, and the V-shaped reflection baffles are evenly arranged in a divergent shape around the circumference of the isotope heat source assembly. Preparation method: making an outer shell; installing a reflective baffle focusing array structure; installing a photoelectric transducer structure and a heat exchange assembly; installing an isotope heat source; equipment routing and vacuum sealing. The present invention constrains the light irradiation area through a focusing array composed of multiple reflective baffles, and re-focuses the photons that cannot be used by the photovoltaic cells in the photoelectric assembly onto the photovoltaic cells, thereby improving the energy conversion efficiency of the battery.

Description

Technical Field

[0001] The invention belongs to the field of isotope batteries, and in particular relates to a reflective concentrating high-performance isotope thermophotovoltaic battery and a preparation method thereof. Background Art

[0002] Isotopes whose atomic nucleus composition (or energy state) spontaneously changes and emits radiation are called radioactive isotopes. Radioactive isotope batteries, or isotope batteries for short, directly utilize the electrical energy of radiation released by radioactive isotope decay or use transducers to convert the energy of radiation released by radioactive isotope decay into electrical energy and output the electrical energy to achieve the purpose of power supply. Because isotope batteries have the advantages of long service life, strong environmental adaptability, good working stability, no maintenance, and miniaturization, they have been widely used in important fields such as military defense, aerospace navigation, polar exploration, biomedicine, and electronics industry.

[0003] Isotope batteries were first proposed by British physicist Henry Mosley in 1913. Among them, static thermoelectric (direct collection, thermoelectric / thermoelectric, thermionic emission, thermophotovoltaic, alkali metal thermoelectric conversion, magnetohydrodynamic power generation) have been widely studied due to their high energy conversion efficiency and simple and reliable structure. Isotope thermophotovoltaic cells are a type of static thermoelectric cell that uses the heat of isotopes for thermal radiation and uses photoelectric components to convert the radiation photon energy into electrical energy. Since the wavelength of the infrared photons radiated is relatively long and the band gap width of the photoelectric semiconductor is poorly matched, a photon filter is often set between the photoelectric component and the thermal radiator to reflect the long-wave photons that the photoelectric component cannot use back to the thermal radiator. The research results on static thermophotovoltaic isotope cells show that the factors affecting the photoelectric conversion efficiency of photovoltaic components include: component frame loss, battery space whiteboard loss, and solder ribbon shadowing. These losses are because the photons incident on the photovoltaic component are not all used by the photovoltaic cell. On the other hand, the energy absorbed by the photovoltaic components but not used by the photovoltaic cells is deposited in the photovoltaic components in the form of heat energy, causing the operating temperature of the photovoltaic cells to increase and reducing the energy conversion efficiency of the photovoltaic cells. Summary of the invention

[0004] The purpose of the present invention is to provide a reflective concentrating high-performance isotope thermal photovoltaic cell to solve the problem of low energy conversion efficiency of existing photovoltaic cells.

[0005] Another object of the present invention is to provide a method for preparing a reflective and concentrating high-performance isotope thermophotovoltaic cell.

[0006] The technical solution of the present invention is: a reflective concentrating high-performance isotope thermophotovoltaic cell, comprising an outer shell, an isotope heat source assembly, a thermal radiator, a photon filter and a photoelectric assembly are arranged in the outer shell, an upper end plate and a lower end plate are respectively arranged at the top and bottom of the outer shell, the upper end plate is provided with a battery output module, and also comprises a cross-beam reflection baffle, a plurality of end surface reflection baffles and a plurality of V-shaped reflection baffles, the cross-beam reflection baffle is installed in the middle of the outer shell around the inner wall of the outer shell, a plurality of end surface reflection baffles are respectively installed on the inner sides of the upper end plate and the lower end plate, the cross section of the V-shaped reflection baffle is V-shaped, the V-shaped reflection baffle is arranged along the length direction of the outer shell, a plurality of V-shaped reflection baffles are evenly arranged in a divergent shape around the circumference of the isotope heat source assembly, the tips of the plurality of V-shaped reflection baffles face the center of the isotope heat source assembly, and the opening ends of the plurality of V-shaped reflection baffles face the outer shell.

[0007] As a further improvement of the present invention, the outer wall of the heat radiator is provided with a plurality of tip slots for installing V-shaped reflective baffles, and the tip of each V-shaped reflective baffle is installed in each tip slot in a one-to-one correspondence.

[0008] As a further improvement of the present invention, a plurality of groups of V-shaped slots for installing V-shaped reflective baffles are respectively provided on the inner sides of the upper end plate and the lower end plate, and the ends of each V-shaped reflective baffle are installed in each V-shaped slot one by one.

[0009] As a further improvement of the present invention, the end face reflection baffle is arranged at intervals from the V-shaped slot.

[0010] As a further improvement of the present invention, the outer shell is in the shape of a regular prism, and a V-shaped reflective baffle is correspondingly arranged at each edge of the outer shell.

[0011] As a further improvement of the present invention, the cross-section of the beam reflective baffle is V-shaped, a beam is provided in the middle of the inner wall of the outer shell, the open end of the beam reflective baffle is installed on the beam, and the two surfaces of the beam reflective baffle face the two ends of the outer shell respectively.

[0012] As a further improvement of the present invention, the cavity of the V-shaped reflective baffle is filled with a heat insulating filler.

[0013] As a further improvement of the present invention, it also includes a heat exchange component, which includes a heat pipe and heat dissipation fins. The heat pipe is close to the photoelectric component, and the heat dissipation fins are installed on the outer side wall of the outer shell. The end of the heat pipe passes through the side wall of the outer shell and is connected to the heat dissipation fins.

[0014] A method for preparing a reflective concentrating high-performance isotope thermophotovoltaic cell comprises the following steps:

[0015] A. Making the outer shell: cutting out fixing brackets on the inner side of the edges of the outer shell, forming snap grooves for installing the optoelectronic components between adjacent fixing brackets, cutting out a crossbeam in the middle of the inner side wall of the outer shell, and opening a heat pipe lead-out hole; making an upper end plate and a lower end plate that match the outer shell, cutting out baffle grooves for installing the end face reflection baffle, a heat source groove for installing the isotope heat source component, and a V-shaped slot on the inner side of the upper end plate and the lower end plate;

[0016] B. Install the reflective baffle focusing array structure: install heat insulation materials on the inner sides of the upper end plate and the lower end plate, and then install the end reflective baffle; fix the crossbeam reflective baffle on the crossbeam of the outer shell; connect the outer shell and the lower end plate together; cut the heat insulation filler according to the shape of the V-shaped reflective baffle, embed the heat insulation filler in the V-shaped slot of the lower end plate and fix it, and fix the heat insulation filler to the fixing bracket; insert the V-shaped reflective baffle into the V-shaped slot of the lower end plate;

[0017] C. Install the photoelectric energy conversion structure and heat exchange components: plate a photon filter on the packaging surface of the photoelectric component, weld a wire to the electrical output end of the photoelectric component and lead the other end of the wire through the wire hole reserved on the lower end plate to the outside of the battery; install the heat pipe in the buckle groove, lead the heat pipe out through the heat pipe lead-out hole reserved on the outer shell, connect the heat dissipation fins to the heat pipe and fix them on the outer shell; install the photoelectric component in the buckle groove;

[0018] D. Install the isotope heat source: place the isotope heat source assembly on the heat source groove of the lower end plate, and set the heat radiator on the outer layer of the isotope heat source assembly so that the tip slot of the heat radiator is engaged with the tip of the V-shaped reflective baffle;

[0019] E. Equipment routing and vacuum sealing: Open air vents and wire holes on the upper end plate, install a sealing valve on the air vent, install the voltage-stabilizing energy storage circuit chip in the battery output module, lead the electrodes of the photoelectric component from the wire holes through wires and connect them to the voltage-stabilizing energy storage circuit chip, install the upper end plate on the outer shell, evacuate the inside of the battery through the sealing valve, connect the voltage-stabilizing energy storage circuit chip to the power output port of the battery output module with wires, and fix the battery output module on the upper end plate.

[0020] Furthermore, the crossbeam reflection baffle, the end surface reflection baffle and the V-shaped reflection baffle are made of tempered glass plates, and the tempered glass plates are plated with a matrix metal layer.

[0021] The principles underlying the present invention are as follows: (1) isotope decay energy is first converted into thermal energy, which is then converted into light energy of radiated photons through thermal radiation, and then the light energy is converted into electrical energy through photoelectric conversion of radiated photons; (2) a focusing array composed of various reflective baffles (crossbeam reflective baffles, end reflective baffles, and V-shaped reflective baffles) is used to constrain the light irradiation area, and photons that were originally unusable by photovoltaic cells in the photovoltaic components are re-focused on the photovoltaic cells, thereby increasing the light intensity in the photovoltaic cell area and improving the overall photoelectric conversion efficiency of photons, thereby improving the energy conversion efficiency of isotope thermal photovoltaic cells.

[0022] The process of realizing electric energy output by the reflective concentrating high-performance isotope thermophotovoltaic cell of the present invention is as follows: the energy released when the radioactive isotope decays is transferred to the thermal radiator in the form of heat energy, the thermal radiator converts the heat energy into radiation photons, and each reflection baffle (crossbeam reflection baffle, end face reflection baffle, V-shaped reflection baffle) effectively converges the radiation photons to the photon filter area, and then the photovoltaic cell converts the light energy into electrical energy.

[0023] The reflective concentrating high-performance isotope thermophotovoltaic cell of the present invention adopts a reflective concentrating structure to converge photons irradiated to the weld, battery packaging frame, support structure and other positions to the photoelectric component area, reducing heat loss and heat accumulation in the non-energy conversion component area. The reflective concentrating high-performance isotope thermophotovoltaic cell of the present invention can be applied to military defense, deep space and deep sea, polar exploration, biomedicine, electronics industry and other fields, providing long-term stable and reliable energy supply.

[0024] Compared with the prior art, the main beneficial effects of the present invention are as follows: the present invention uses a focusing array composed of multiple reflective baffles (crossbeam reflective baffles, end face reflective baffles, and V-shaped reflective baffles) to perform optical convergence, and re-converges photons that cannot be used by photovoltaic cells in the original photovoltaic assembly to the photovoltaic cell area, so that the light intensity that can be used by the photovoltaic cell is increased, thereby improving the conversion efficiency of the photoelectric transducer device. In addition, the heat generated by the radiation photons irradiating outside the battery assembly is reduced, and the heat dissipation of the isotope thermal photovoltaic cell is reduced, thereby improving the overall energy conversion efficiency. The preparation method of the present invention is simple, easy to implement, and has great promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a radial cross-sectional view of the reflective concentrating high-performance isotope thermophotovoltaic cell of the present invention;

[0026] Figure 2 It is a three-dimensional diagram of the reflective concentrating high-performance isotope thermophotovoltaic cell of the present invention;

[0027] Figure 3 It is a schematic diagram of the structure of the outer shell in the present invention;

[0028] Figure 4 A schematic diagram of the structure of the lower end plate in the present invention;

[0029] Figure 5 is a schematic diagram of the arrangement of the end face reflection baffles in the present invention;

[0030] Figure 6 It is a structural schematic diagram of the upper end plate in the present invention;

[0031] Figure 7 It is a structural schematic diagram of the battery output module in the present invention;

[0032] Figure 8 It is a schematic diagram of the structure of the isotope heat source assembly in the present invention.

[0033] In the figure: 1-V-shaped reflective baffle; 2-insulating layer; 3-radiator; 4-isotope fuel pellet; 5-heat-conducting cladding; 6-photon filter; 7-photoelectric component; 8-heat-conducting pipe; 9-shell cladding; 10-heat-dissipating fin; 11-end reflective baffle; 12-crossbeam reflective baffle; 13-isotope heat source component; 14-clip groove; 15-fixing bracket; 16-heat-conducting pipe lead-out hole; 17-first bolt hole ; 18-sealing gasket groove; 19-baffle groove; 20-heat source groove; 21-lower end plate; 22-upper end plate; 24-V-shaped slot; 25-fuel cladding; 26-buffer material; 28-battery output module; 29-sealing valve; 31-wire hole; 32-voltage-stabilizing energy storage circuit chip; 33-electricity output port; 34-tip slot; 35-thermal insulation filler; 36-crossbeam; 37-second bolt hole. DETAILED DESCRIPTION

[0034] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] like Figure 1-Figure 8As shown, a reflective concentrating high-performance isotope thermophotovoltaic cell comprises an outer shell 9, in which an isotope heat source assembly 13, a heat radiator 3, a photon filter 6 and a photoelectric assembly 7 are arranged, the isotope heat source assembly 13 is located in the center of the outer shell 9, the heat radiator 3 is located at the periphery of the isotope heat source assembly, the photoelectric assembly 7 is installed on the inner side of the outer shell 9, the photon filter 6 is located between the photoelectric assembly 7 and the heat radiator 3, the top and bottom of the outer shell 9 are respectively provided with an upper end plate 22 and a lower end plate 21, the upper end plate 22 is provided with a battery output module 28, and also includes a cross beam reflection block Plate 12, multiple end face reflection baffles 11 and multiple V-shaped reflection baffles 1, the crossbeam reflection baffle 12 is installed around the inner wall of the outer shell cladding 9 in the middle of the outer shell cladding 9, and multiple end face reflection baffles 11 are respectively installed on the inner sides of the upper end plate 22 and the lower end plate 21. The cross section of the V-shaped reflection baffle 1 is V-shaped, and the V-shaped reflection baffle 1 is arranged along the length of the outer shell cladding 9. Multiple V-shaped reflection baffles 1 are evenly arranged in a divergent shape around the circumference of the isotope heat source assembly 13, and the tips of the multiple V-shaped reflection baffles 1 are facing the center of the isotope heat source assembly 13, and the open ends of the multiple V-shaped reflection baffles 1 are facing the outer shell cladding 9.

[0036] The outer wall of the heat radiator 3 is provided with a plurality of tip slots 34 for installing the V-shaped reflective baffles 1, and the tips of the V-shaped reflective baffles 1 are installed in the tip slots 34 one by one. The inner sides of the upper end plate 22 and the lower end plate 21 are respectively provided with a plurality of groups of V-shaped slots 24 for installing the V-shaped reflective baffles 1, and the ends of the V-shaped reflective baffles 1 are installed in the V-shaped slots 24 one by one. The end surface reflective baffles 11 are arranged at intervals from the V-shaped slots 24.

[0037] The outer shell 9 is in the shape of a regular prism, and a V-shaped reflective baffle 1 is correspondingly arranged at each edge of the outer shell 9 .

[0038] The cross section of the beam reflection baffle 12 is V-shaped. A beam 36 is provided in the middle of the inner wall of the outer shell 9. The open end of the beam reflection baffle 12 is installed on the beam 36. The two surfaces of the beam reflection baffle 12 face the two ends of the outer shell 9 respectively.

[0039] The cavity of the V-shaped reflective baffle 1 is filled with a heat insulating filler 35 .

[0040] It also includes a heat exchange component, which includes a heat pipe 8 and a heat dissipation fin 10. The heat pipe 8 is close to the photoelectric component 7, and the heat dissipation fin 10 is installed on the outer wall of the outer shell 9. The end of the heat pipe 8 passes through the side wall of the outer shell 9 and is connected to the heat dissipation fin 10. The length and number of the heat dissipation fin 10 are related to the design power of the battery.

[0041] The isotope heat source assembly 13 comprises an isotope fuel pellet 4, a fuel cladding 25, a buffer material 26 and a heat-conducting cladding 5 which are arranged in sequence from the inside to the outside, and a heat-insulating layer 2 is provided at both ends of the buffer material 26.

[0042] A method for preparing a reflective concentrating high-performance isotope thermophotovoltaic cell comprises the following steps:

[0043] A. Making the outer shell 9: using a press machine to curl the aluminum alloy plate into a regular prism-shaped outer shell 9, and welding the seams; using a cutting machine to cut out a fixing bracket 15 on the inner side of the edge of the outer shell 9, forming a snap groove 14 for installing the optoelectronic component 7 between adjacent fixing brackets 15, cutting out a crossbeam 36 in the middle of the inner side wall of the outer shell 9, and opening a heat pipe lead-out hole 16; using a cutting machine to open a first bolt hole 17 at the edges of both ends of the outer shell 9, and cutting out a sealing gasket groove 18 for installing a vacuum sealing gasket; using an aluminum alloy plate to make an upper end plate 22 and a lower end plate 21 that match the outer shell 9, using a cutting machine to cut out a baffle groove 19 for installing an end face reflection baffle 11, a heat source groove 20 for installing an isotope heat source assembly 13, and a V-shaped slot 24 on the inner side of the upper end plate 22 and the lower end plate 21, and opening a second bolt hole 37, the second bolt hole 37 corresponding to the first bolt hole 17;

[0044] B. Install the reflective baffle focusing array structure: install heat insulation material on the inner side of the upper end plate 22 and the lower end plate 21, and then install the end face reflective baffle 11; the end face reflective baffle 11 is fixed to the baffle groove 19 on the inner side of the upper end plate 22 and the lower end plate 21 by snaps; fix the crossbeam reflective baffle 12 to the crossbeam 36 of the outer shell by screws; use bolts to connect the outer shell 9 and the lower end plate 21 together; cut the heat insulation filler 35 according to the shape of the V-shaped reflective baffle 1, embed the heat insulation filler 35 in the V-shaped slot 24 of the lower end plate 21 and fix it with adhesive, and fix the heat insulation filler 35 and the fixing bracket 15 with adhesive; insert the V-shaped reflective baffle 1 into the V-shaped slot 24 of the lower end plate 21;

[0045] C. Install the photoelectric energy conversion structure and heat exchange component: plate the photon filter 6 on the packaging surface of the photoelectric component 7, weld a wire on the electrical output end of the photoelectric component 7 and lead the other end of the wire through the wire hole reserved on the lower end plate 21 to the outside of the battery; install the heat pipe 8 on the buckle groove 14, lead the heat pipe 8 through the heat pipe lead-out hole 16 reserved on the outer shell 9, use a sealing ring on the heat pipe lead-out hole 16, connect the heat dissipation fin 10 with the heat pipe 8 and fix it on the outer shell 9 by screws; install the photoelectric component 7 in the buckle groove 14; the position of the heat pipe 8 corresponds to the photovoltaic cell in the photoelectric component 7, and fill the gap between the photoelectric component 7 and the heat pipe 8 with thermal conductive material; the photon filter 6 is fixed above the receiving surface of the photoelectric component 7 by a light-transmitting adhesive material (which can be EVA or silicone);

[0046] D. Installing the isotope heat source: Wrap the isotope fuel pellet 4 with the fuel cladding 25, then wrap the fuel cladding 25 with the buffer material 26, set the heat insulation layer 2 at both ends of the buffer material 26, and then wrap the entire structure with the heat conductive cladding 5 to make the isotope heat source assembly 13; place the isotope heat source assembly 13 on the heat source groove 20 of the lower end plate 21, and set the heat radiator 3 on the outer layer of the isotope heat source assembly 13, so that the tip slot 34 of the heat radiator 3 is engaged with the tip of the V-shaped reflective baffle 1;

[0047] E. Equipment routing and vacuum sealing: An air outlet and a wire hole 31 are provided on the upper end plate 22, a sealing valve 29 is installed on the air outlet, a voltage-stabilizing energy storage circuit chip 32 is installed in the battery output module 28, the electrodes of the photoelectric component 7 are led out from the wire hole 31 through a wire and connected to the voltage-stabilizing energy storage circuit chip 32, the upper end plate 22 is installed on the outer shell 9, and the corresponding installation method of the heat source groove 20 and the V-shaped slot 24 on the upper end plate 22 is the same as that of the lower end plate 21, the interior of the battery is evacuated through the sealing valve 29, the voltage-stabilizing energy storage circuit chip 32 is connected to the power output port 33 of the battery output module 28 with a wire, and the battery output module 28 is welded and fixed to the upper end plate 22.

[0048] The cross beam reflection baffle 12, the end face reflection baffle 11 and the V-shaped reflection baffle 1 are made of tempered glass plates, and the tempered glass plates are plated with matrix metal. The tempered glass plate material (which can be fused quartz, calcium fluoride, or magnesium fluoride) is hot-bent to form a V-shape, and the matrix metal coating material (which can be aluminum, silver, gold, or mercury) is applied on the inner side to complete the production of the V-shaped reflection baffle 1. The cross beam reflection baffle 12 is produced in the same way. The tempered glass is cut according to the shape of the end face reflection baffle 11, and the matrix metal coating is applied on the back side, and a snap connector is welded on the matrix metal to facilitate connection with the upper end plate 22 and the lower end plate 21.

[0049] There is a vacuum cavity between the heat radiator 3 and the photoelectric assembly 7. The upper end plate 22, the lower end plate 21 and the outer shell cladding 9 adopt a flange connection structure, which is convenient for replacing fuel and maintenance.

[0050] According to actual heat dissipation needs, the working medium in the heat pipe 8 can also be a coolant driven by a water pump. According to the activity and size of the radiation source, the radius of the heat radiator 3 and the angle of the V-shaped reflective baffle 1 can be adjusted according to actual needs.

[0051] The radiation source can be an alpha radiation source: 210 Po, Gd 210 Po, 210 Po(RE), 210 Po(RE) 3 , 235 U. 238 Pu, 238 PcO 2Microspheres, 238 PcO 2 -Mo Ceramics, 238 PcO 2 Fuel Balls, 238 PcO 2 ceramics, 238 Pu-Zr alloy, 238 Pu-Ga alloy, 238 Pu-Pt alloy, 238 Pu-Sc alloy, 238 PuN, 238 PuC, 241 Am, 242 Cm, 242 Cm 2 O 3 , 244 Cm or 244 Cm 2 O 3 , or a beta-radiation source: 3 H. 14 C. 35 S. 63 You, 90 Sr. 90 Sr / 90 Y. 90 SrTiO 3 , 106 Such as 137 Cs, 137 CsCl, 144 Ce, 144 CeO 2 , 147 Pm, 147 Pm 2 O 3 or 151 The fuel cladding 25 can be made of tantalum alloy, lead, rhodium, or nano-lead composite material. The buffer material 26 can be a three-dimensional carbon-carbon composite material. The heat-conducting cladding 5 can be made of copper or stainless steel. The photoelectric component 7 can be made of Si, Ge, or Nd. 2 O 3 , GaSb, InGaAsSb, InGaAs or InPAsSb. The thermal conductive medium may be silicone grease, silica gel, or graphite. The photon filter 6 material may be Si / SiO 2 , ITO, TCOs. The heat pipe 8 can be made of copper or aluminum. The heat sink 10 can be made of aluminum, copper, or carbon fiber composite material. The heat insulation material can be glass fiber wool or glass wool. The outer shell 9, the lower end plate 21, and the upper end plate 22 can be made of light alloy materials such as aluminum alloy, titanium alloy, and magnesium alloy.

[0052] The reflective concentrating high-performance isotope thermophotovoltaic cell of the present invention can increase the intensity of light incident on the surface of the photovoltaic cell and reduce the heat generated by the photovoltaic component, so that the photovoltaic component has higher energy conversion efficiency and greater electrical output power.

Claims

1. A reflective concentrating high-performance isotope thermophotovoltaic cell, comprising an outer shell (9), wherein an isotope heat source component (13), a heat radiator (3), a photon filter (6) and a photoelectric component (7) are arranged inside the outer shell (9), an upper end plate (22) and a lower end plate (21) are arranged at the top and bottom of the outer shell (9), and a cell output module (28) is arranged on the upper end plate (22). Features: It also comprises a cross-beam reflection baffle (12), a plurality of end-face reflection baffles (11) and a plurality of V-shaped reflection baffles (1), wherein the cross-beam reflection baffle (12) surrounds the inner wall of the outer shell (9) and is installed in the middle of the outer shell (9), and the plurality of end-face reflection baffles (11) are respectively installed on the inner sides of the upper end plate (22) and the lower end plate (21), wherein the cross section of the V-shaped reflection baffle (1) is V-shaped, the V-shaped reflection baffle (1) is arranged along the length direction of the outer shell (9), and the plurality of V-shaped reflection baffles (1) are evenly arranged in a divergent manner around the circumference of the isotope heat source assembly (13), the tips of the plurality of V-shaped reflection baffles (1) face the center of the isotope heat source assembly (13), and the open ends of the plurality of V-shaped reflection baffles (1) face the outer shell (9); The cross-section of the cross-beam reflection baffle (12) is V-shaped, a cross-beam (36) is provided in the middle of the inner side wall of the outer shell (9), the open end of the cross-beam reflection baffle (12) is mounted on the cross-beam (36), and two surfaces of the cross-beam reflection baffle (12) face the two ends of the outer shell (9) respectively; The outer shell (9) is in the shape of a regular prism, and a V-shaped reflection baffle (1) is correspondingly arranged at each edge of the outer shell (9).

2. A reflective concentrating high-performance isotope thermophotovoltaic cell according to claim 1, Features: The outer wall of the heat radiator (3) is provided with a plurality of tip slots (34) for mounting the V-shaped reflective baffles (1), and the tips of the V-shaped reflective baffles (1) are mounted in the tip slots (34) in a one-to-one correspondence.

3. A reflective concentrating high-performance isotope thermophotovoltaic cell according to claim 1 or 2, Features: The upper end plate (22) and the lower end plate (21) are respectively provided with a plurality of groups of V-shaped slots (24) for mounting the V-shaped reflective baffles (1), and the ends of the V-shaped reflective baffles (1) are mounted in the V-shaped slots (24) in a one-to-one correspondence.

4. A reflective concentrating high-performance isotope thermophotovoltaic cell according to claim 3, Features: The end surface reflection baffle (11) and the V-shaped slot (24) are arranged at intervals.

5. A reflective concentrating high-performance isotope thermophotovoltaic cell according to claim 4, Features: The cavity of the V-shaped reflective baffle (1) is filled with a heat-insulating filler (35).

6. A reflective concentrating high-performance isotope thermophotovoltaic cell according to claim 5, Features: It also includes a heat exchange component, which includes a heat pipe (8) and a heat dissipation fin (10), the heat pipe (8) is closely attached to the photoelectric component (7), the heat dissipation fin (10) is installed on the outer side wall of the outer shell (9), and the end of the heat pipe (8) passes through the side wall of the outer shell (9) and is connected to the heat dissipation fin (10).

7. A method for preparing a reflective and concentrating high-performance isotope thermophotovoltaic cell. Features The following steps are involved: A. Manufacturing an outer shell (9): cutting out a fixing bracket (15) on the inner side of the edge of the outer shell (9), forming a snap groove (14) for mounting the photoelectric component (7) between adjacent fixing brackets (15), cutting out a crossbeam (36) in the middle of the inner side wall of the outer shell (9), and providing a heat pipe lead-out hole (16); manufacturing an upper end plate (22) and a lower end plate (21) adapted to the outer shell (9), and cutting out a baffle groove (19) for mounting an end face reflection baffle (11), a heat source groove (20) for mounting an isotope heat source component (13), and a V-shaped slot (24) on the inner side of the upper end plate (22) and the lower end plate (21); B. Installing the reflective baffle focusing array structure: installing heat insulation materials on the inner sides of the upper end plate (22) and the lower end plate (21), and then installing the end face reflective baffle (11); fixing the crossbeam reflective baffle (12) on the crossbeam (36) of the outer shell; connecting the outer shell (9) and the lower end plate (21); cutting the heat insulation filler (35) according to the shape of the V-shaped reflective baffle (1), embedding the heat insulation filler (35) in the V-shaped slot (24) of the lower end plate (21) and fixing it, and fixing the heat insulation filler (35) to the fixing bracket (15); inserting the V-shaped reflective baffle (1) into the V-shaped slot (24) of the lower end plate (21); C. Installing the photoelectric energy conversion structure and the heat exchange component: coating the packaging surface of the photoelectric component (7) with a photon filter (6), welding a wire to the electrical output end of the photoelectric component (7), and leading the other end of the wire through a wire hole reserved on the lower end plate (21) to the outside of the battery; installing the heat pipe (8) in the buckle groove (14), leading the heat pipe (8) through the heat pipe lead-out hole (16) reserved on the outer shell (9), connecting the heat dissipation fin (10) to the heat pipe (8) and fixing them on the outer shell (9); installing the photoelectric component (7) in the buckle groove (14); D. Installing the isotope heat source: placing the isotope heat source assembly (13) on the heat source groove (20) of the lower end plate (21), and fitting the heat radiator (3) on the outer layer of the isotope heat source assembly (13) so that the tip slot (34) of the heat radiator (3) engages with the tip of the V-shaped reflective baffle (1); E. Equipment wiring and vacuum sealing: An air outlet and a wire hole (31) are provided on the upper end plate (22), a sealing valve (29) is installed on the air outlet, a voltage-stabilizing energy storage circuit chip (32) is installed in the battery output module (28), electrodes of the photoelectric component (7) are led out from the wire hole (31) through a wire and connected to the voltage-stabilizing energy storage circuit chip (32), the upper end plate (22) is installed on the outer shell (9), the interior of the battery is evacuated through the sealing valve (29), the voltage-stabilizing energy storage circuit chip (32) is connected to the power output port (33) of the battery output module (28) through a wire, and the battery output module (28) is fixed on the upper end plate (22).

8. A method for preparing a reflective concentrating high-performance isotope thermophotovoltaic cell according to claim 7, Features: The crossbeam reflection baffle (12), the end surface reflection baffle (11) and the V-shaped reflection baffle (1) are made of a tempered glass plate, and the tempered glass plate is plated with a matrix metal layer.

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