Electrochemical energy storage unmanned aerial vehicle container and preparation method thereof

Abstract

The invention discloses an electrochemical energy storage unmanned aerial vehicle container and a preparation method thereof, and relates to the technical field of unmanned aerial vehicle containers. The electrochemical energy storage composite board comprises a first panel, an electrochemical energy storage layer and a second panel which are sequentially arranged in a stacked mode. The first panel and the second panel each comprise a fiber resin composite material layer, and the fiber resin composite material layers are obtained after fiber fabric is impregnated with resin and cured. The electrochemical energy storage layer comprises a honeycomb core plate and a plurality of battery units which are embedded in the honeycomb core plate and are arranged in an array. The electrochemical energy storage container is light in weight and high in strength and rigidity, has a storage function and an electrochemical energy storage function, can bear large-weight loads, can supply power to the unmanned aerial vehicle and can also be used as a standby power source of the freight unmanned aerial vehicle. The electrochemical energy storage container is an effective scheme for solving the problems of short flight radius, short endurance mileage and short endurance time of the freight unmanned aerial vehicle.

Description

Technical Field

[0001] The present invention relates to the technical field of drone cargo boxes, and in particular to an electrochemical energy storage drone cargo box and a preparation method thereof. Background Art

[0002] The continuous iteration of drone technology and its accessories has provided drones with a wider range of applications. Multi-rotor drone technology makes low-altitude transportation possible, especially in areas with complex terrain and inconvenient transportation, thereby promoting the growth of the low-altitude economy and shortening the time for transporting goods and other items. The endurance of drones is a key factor restricting low-altitude transportation. At this stage, major drone companies mainly improve endurance in two ways: one is to break through battery technology and increase the specific capacity of batteries, but the iteration speed of battery technology has slowed down, especially the development of high-performance small-volume batteries has reached a bottleneck; the second is to use lightweight materials to reduce the weight of the fuselage to increase the battery carrying capacity and increase the mileage.

[0003] In addition, the current delivery methods of cargo drones are divided into two types: cargo box type and air-lift type. The air-lift type has relatively high performance requirements for the drone itself. It needs to maintain the stability and balance of the load during flight and avoid cargo swinging due to wind or flight attitude changes. It requires precise flight power compensation and control systems. Since the drone and the cargo box are closely combined, the control system requirements of cargo box drones are lower than those of air-lift drones. However, the load of the shelf cargo box will increase the load of the drone, thereby further reducing the load capacity and flight time of the cargo drone.

[0004] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0005] Based on the above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide an electrochemical energy storage UAV cargo box and a preparation method thereof, aiming to solve the problem that the existing UAVs have a low cruising range and the addition of a cargo box will increase the load of the UAV, thereby further reducing the load capacity and cruising time of the cargo UAV.

[0006] The technical solution of the present invention is as follows:

[0007] A first aspect of the present invention provides an electrochemical energy storage drone cargo box, wherein the electrochemical energy storage drone cargo box is enclosed by an electrochemical energy storage composite plate, and the electrochemical energy storage composite plate includes a first panel, an electrochemical energy storage layer, and a second panel stacked in sequence:

[0008] The first panel and the second panel both include a fiber resin composite material layer, wherein the fiber resin composite material layer is obtained by impregnating fiber fabric with resin and curing it;

[0009] The electrochemical energy storage layer includes a honeycomb core plate and a plurality of battery cells arranged in an array and embedded in the honeycomb core plate.

[0010] Optionally, the plurality of array-arranged battery cells are arranged in a first array arrangement;

[0011] Each of the plurality of battery cells arranged in an array comprises a plurality of battery cells arranged in a second array arrangement, wherein the plurality of battery cells are electrically connected in parallel first and then in series, and the two wires extending from the series connection are respectively connected to fuses;

[0012] The honeycomb core plate is provided with holes arranged in a first array and a second array, and the plurality of battery cells are embedded in the holes.

[0013] Optionally, the distance between two adjacent battery cells is greater than the distance between two adjacent battery cells in each battery cell.

[0014] Optionally, one or two honeycombs on the edges of the holes on the honeycomb core plate arranged in the first array and the second array are filled with honeycomb cement.

[0015] Optionally, the honeycomb core panel is made of one of aramid paper honeycomb, aluminum honeycomb with an insulating layer coated on the surface, and glass cloth honeycomb.

[0016] Optionally, the electrochemical energy storage layer further comprises a heat dissipation silicone layer, which is located on the surface of the battery cell embedded in the hole, and the total thickness of the heat dissipation silicone layer and the battery cell is equal to the thickness of the honeycomb core board.

[0017] Optionally, the first panel and the second panel each independently include a plurality of stacked fiber-resin composite material layers, and the fiber fabrics in the plurality of stacked fiber-resin composite material layers are each independently selected from one of carbon fiber fabric, glass fiber fabric, Kevlar fiber fabric, aramid fiber fabric and polyamide fiber fabric;

[0018] The resin in the plurality of stacked fiber-resin composite material layers is a thermosetting resin, and the thermosetting resin includes one of epoxy resin, phenolic resin, polyester resin, vinyl ester resin, bismaleimide resin and polyimide resin.

[0019] A second aspect of the present invention provides a method for preparing an electrochemical energy storage UAV cargo box, which comprises the following steps:

[0020] Providing an electrochemical energy storage layer, the electrochemical energy storage layer comprising a honeycomb core plate and a plurality of battery cells arranged in an array and embedded in the honeycomb core plate;

[0021] After impregnating the fiber fabric with resin, the fiber fabric is placed on both sides of the electrochemical energy storage layer respectively, and after curing, an electrochemical energy storage composite plate including a first panel, an electrochemical energy storage layer and a second panel stacked in sequence is formed;

[0022] The electrochemical energy storage composite panels are assembled to form an electrochemical energy storage UAV cargo box.

[0023] Optionally, the method for preparing the electrochemical energy storage layer comprises the following steps:

[0024] Holes are opened on the honeycomb core plate according to the size of the battery cells and the first array arrangement and the second array arrangement, and the electrically connected battery cells are placed in the holes to form a plurality of battery units arranged in the first array arrangement, each battery unit containing a plurality of battery cells arranged in the second array arrangement, thereby obtaining an electrochemical energy storage layer.

[0025] Optionally, the fiber fabric is impregnated with resin and then placed on both sides of the electrochemical energy storage layer respectively. After curing, the steps of forming an electrochemical energy storage composite plate including a first panel, an electrochemical energy storage layer and a second panel stacked in sequence specifically include:

[0026] Step A, placing the fiber fabric impregnated with resin, the electrochemical energy storage layer, the demoulding cloth, the air-permeable felt and the wooden board stacked in sequence from bottom to top on a bottom plate, covering the wooden board with a vacuum bag and sealing it with the bottom plate, evacuating the vacuum bag, curing the board, and demoulding the board to obtain a first panel with the electrochemical energy storage layer bonded on the surface;

[0027] Step B, placing a first panel with an electrochemical energy storage layer bonded on the surface thereof on a bottom plate, the first panel being arranged in contact with the bottom plate, placing a fiber fabric impregnated with resin, a demoulding cloth, a breathable felt and a wooden board stacked in sequence from bottom to top on the electrochemical energy storage layer, covering the wooden board with a vacuum bag and sealing it with the bottom plate, evacuating the vacuum bag, and curing the board, after demoulding, bonding a second panel to the upper surface of the electrochemical energy storage layer, thereby forming an electrochemical energy storage composite board including the first panel, the electrochemical energy storage layer and the second panel stacked in sequence; or placing a fiber fabric impregnated with resin, The material is placed on a base plate, and then a first panel with an electrochemical energy storage layer bonded on the surface is placed on the fiber fabric impregnated with resin, the electrochemical energy storage layer is arranged on the fiber fabric impregnated with resin, and then a demoulding cloth, a breathable felt and a wooden board are stacked in sequence from bottom to top on the first panel, a vacuum bag is covered on the wooden board and sealed with the base plate, vacuuming is performed, and curing is performed. After demoulding, a second panel is bonded to the lower surface of the electrochemical energy storage layer, so as to form an electrochemical energy storage composite plate including the first panel, the electrochemical energy storage layer and the second panel stacked in sequence.

[0028] Beneficial effects: The electrochemical energy storage cargo box provided by the present invention is lightweight, has high strength and rigidity, can protect the cargo well, and contains battery cells in the box to supply power. The electrochemical energy storage cargo box has both storage and electrochemical energy storage functions, and can not only bear large weight loads, but also supply power to drones. It can also be used as a backup power source for cargo drones to increase power. The electrochemical energy storage cargo box in the present invention reduces the total weight on the basis of realizing the storage and energy storage functions, and realizes the lightweight of the entire cargo drone. It is an effective solution to solve the problems of short flight radius, short cruising range and time of cargo drones. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the structure of the electrochemical energy storage drone cargo box.

[0030] Figure 2 Schematic diagram of the decomposed structure of the electrochemical energy storage layer.

[0031] Figure 3 The schematic diagram is a planar structure of a honeycomb core panel and a plurality of array-arranged battery units and battery cells embedded in the honeycomb core panel.

[0032] Figure 4 Schematic diagram of the electrical connection method of battery cells in a single cell unit.

[0033] Figure 5 It is a schematic diagram of the structure of a honeycomb core panel with holes and a schematic diagram of the filling position of the honeycomb cement.

[0034] Figure 6 Schematic diagram of the preparation of electrochemical energy storage composite plates.

[0035] Figure 7 Schematic diagram of the assembly of the electrochemical energy storage composite plate.

[0036] Figure Number:

[0037] 1. Electrochemical energy storage composite plate; 11. First panel; 11', fiber fabric impregnated with resin; 12. Electrochemical energy storage layer; 120, honeycomb core plate; 121, single cell unit; 122, battery cell; 123, heat dissipation silicone layer; 124, holes; 125, honeycomb clay; 13, second panel; 2. Bottom plate; 3. Release cloth; 4. Breathable felt; 5. Wooden board; 6. Vacuum bag; 7. Sealing tape; 8. Vacuum valve; 9. Right-angle connector. DETAILED DESCRIPTION

[0038] The present invention provides an electrochemical energy storage drone cargo box and a preparation method thereof. To make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0039] Unless otherwise defined, all technical terms and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0040] An embodiment of the present invention provides an electrochemical energy storage drone cargo box, wherein, Figures 1 to 3 As shown ( Figure 1 In the electrochemical energy storage drone cargo box, there is an electrochemical energy storage composite plate on one side that is not shown), the electrochemical energy storage drone cargo box is enclosed by an electrochemical energy storage composite plate 1, and the electrochemical energy storage composite plate 1 includes a first panel 11, an electrochemical energy storage layer 12, and a second panel 13 that are stacked in sequence:

[0041] The first panel and the second panel both include a fiber resin composite material layer, wherein the fiber resin composite material layer is obtained by impregnating fiber fabric with resin and curing it;

[0042] The electrochemical energy storage layer 12 includes a honeycomb core plate (with the characteristics of light weight and high strength) 120 and a plurality of array-arranged battery cells 121 embedded in the honeycomb core plate 120 .

[0043] The electrochemical energy storage cargo box provided by the present invention is light in weight (the first panel and the second panel are prepared by fiber resin composite materials, and the electrochemical energy storage layer is prepared by honeycomb core board, so it is light in weight), can reduce the weight of the whole machine, and has high strength and rigidity, can well protect the goods, and its box contains battery cells, which can supply power. The electrochemical energy storage cargo box has both storage function and electrochemical energy storage function, which can not only bear large weight load, but also power the drone, and it can also be used as a backup power supply for the cargo drone to increase the power. The electrochemical energy storage cargo box in the present invention reduces the total weight on the basis of realizing the storage and energy storage functions, realizes the lightweight of the cargo drone, and is an effective solution to solve the short flight radius, short cruising range and time of the cargo drone. In addition, compared with the case of external hanging batteries, the present invention adopts the electrochemical energy storage layer as described above (the battery cell is embedded in the honeycomb core board) to save the internal space of the cargo box, and the harm caused by the drone in the event of an accident is smaller. The present invention cleverly embeds the battery cell in the honeycomb core board of the box body, which has a lighter weight while realizing the drone cargo transportation and increasing the cruising range of the drone.

[0044] In this embodiment, six rectangular electrochemical energy storage composite plates can be used to enclose a square electrochemical energy storage drone cargo box. The electrochemical energy storage composite plate is a sandwich structure, with a first panel and a second panel on both sides, and the middle sandwich is an electrochemical energy storage layer. Specifically, each electrochemical energy storage composite plate is detachably connected (such as riveted) to assemble into an electrochemical energy storage drone cargo box.

[0045] In some embodiments, the plurality of array-arranged (or uniformly arranged) battery cells are electrically connected in parallel first and then in series, and the two wires extending from the series connection are respectively connected to fuses.

[0046] In some embodiments, the plurality of battery cells are connected by wires with an insulating layer (such as copper wires), and a reinforcing strip is used to protect the wire welding points. After a battery cell fails, this part can be cut and replaced with a battery cell of the same structure. The reinforcing strip can protect the wire and facilitate the connection of the new battery cell to the circuit.

[0047] In some embodiments, Figure 3 As shown, the plurality of array-arranged battery cells 121 are arranged in a first array arrangement. Among the plurality of array-arranged battery cells, each battery cell 121 includes a plurality of battery cells 122 arranged in a second array arrangement (or, uniformly arranged in a second array arrangement). And the distance d1 between two adjacent battery cells is greater than the distance d2 between two adjacent battery cells 122 in each battery cell. In other words, the battery cells inside the battery cell are densely arranged, and the battery cells are dispersed (compared with the concentrated arrangement of the battery cells, the arrangement of the present invention has better mechanical properties). The arrangement of battery cells and single-cell monomers has a great influence on the mechanical properties of the electrochemical energy storage composite plate and battery safety. Such an arrangement can minimize the damage of the battery to the honeycomb core plate, enhance the strength and rigidity of the entire electrochemical energy storage layer, and disperse the heat generated during the operation of the battery cells to ensure temperature uniformity, avoid heat concentration that may lead to battery cell failure, ensure the electrochemical performance of the battery cells during operation and the safety of the electrochemical energy storage layer, and also reserve space for the laying of fuses.

[0048] For example, Figure 3 As shown, the first array arrangement is an equally spaced square array arrangement. The second array arrangement is an equally spaced square array arrangement, and the spacing of the first array arrangement is greater than the spacing of the second array arrangement. Of course, the present invention is not limited to this arrangement, and the first array arrangement and the second array arrangement may also be equally spaced triangular array arrangements, or unequally spaced arrangements, etc.

[0049] Specifically, the honeycomb core plate is provided with holes arranged in a first array and a second array, and the plurality of battery cells are embedded in the holes.

[0050] In the present invention, the battery cell may be a soft-pack square battery or a special-shaped battery, and the shape of the hole is determined according to the shape of the battery cell.

[0051] In some embodiments, the plurality of battery cells are electrically connected in parallel first and then in series, and the two wires extending from the series connection are respectively connected to fuses. When a single battery cell fails, the fuse blows without affecting the operation of other battery cells. In this way, the safety of the entire circuit can be ensured, and the overall impact when a single battery cell fails can be minimized. Specifically, Figure 4 As shown, the battery cells in each column are first connected in parallel, and then the batteries in all the columns connected in parallel are connected in series (ie, they are connected in series in columns).

[0052] In some embodiments, one or two honeycombs at the edges of the holes on the honeycomb core panel that are arranged in a first array and a second array are filled with honeycomb putty (e.g., lightweight filling and reinforcing putty 6100F-22 specifically for honeycomb cores, purchased from Shenzhen Langbowan Advanced Materials Co., Ltd.). Because the honeycomb core panel structure is the lightest structure under the same volume, embedding battery cells on the honeycomb core panel will destroy the rigidity and strength of the structure to a certain extent. In this embodiment, filling the honeycombs at the edges of the holes with honeycomb putty not only has the function of fixing the battery cells, but also can restore the rigidity and strength, and enhance the overall mechanical properties. In specific implementation, if the honeycomb at the edge of the hole is incomplete (i.e., less than a whole grid), this incomplete honeycomb is filled with honeycomb putty but is not counted, and one or two honeycombs outside this incomplete honeycomb are filled with honeycomb putty. Figure 5 As shown, a honeycomb glue 125 is filled in a honeycomb at the edge of the hole 124. In addition, the honeycomb glue is low-density (0.35-0.8g / cm 3 ), materials with bonding effect, therefore, it can also bond panels and honeycomb core panels.

[0053] In some embodiments, the honeycomb core plate is made of one of aramid paper honeycomb, aluminum honeycomb with an insulating layer coated on the surface, and glass cloth honeycomb, but is not limited thereto. The honeycomb core plate can be prepared by 3D printing, but is not limited thereto.

[0054] In some embodiments, Figure 2As shown, the electrochemical energy storage layer 12 also includes a heat dissipation silicone layer 123, and the heat dissipation silicone layer 123 is located on the surface of the battery cell 122 embedded in the hole, and the total thickness of the heat dissipation silicone layer and the battery cell is equal to the thickness of the honeycomb core panel. The provision of the heat dissipation silicone layer can accelerate heat conduction and ensure the stability of the temperature distribution of the entire electrochemical energy storage composite plate. Specifically, a heat dissipation silicone layer can be provided on the surface of the battery cell close to the first panel side; a heat dissipation silicone layer can also be provided on the surface of the battery cell close to the first panel side; of course, as Figure 2 As shown, a heat dissipation silicone layer 123 can also be provided on the surface of the battery cell 122 near the first panel 11 and the second panel 13. In some specific embodiments, the thickness of the honeycomb core panel is 1-2 mm thicker than the thickness of the battery cell, so that the total thickness of the heat dissipation silicone layer is 1-2 mm.

[0055] The present invention provides a heat dissipation silicone layer on the surface of the battery cells arranged in an array, ensures temperature uniformity through structural and material designs, avoids local excessive temperature, solves the problem of heat bulging caused by the battery cells during high-current discharge, and improves the safety of the cargo drone during flight.

[0056] In some embodiments, the first panel and the second panel each independently include a plurality of stacked fiber-resin composite material layers, and the fiber fabrics in the plurality of stacked fiber-resin composite material layers are each independently selected from one of carbon fiber fabric, glass fiber fabric, Kevlar fiber fabric, aramid fiber fabric and polyamide fiber fabric, but are not limited thereto. The resins in the plurality of stacked fiber-resin composite material layers are each independently a thermosetting resin, and the thermosetting resin includes one of epoxy resin, phenolic resin, polyester resin, vinyl ester resin, bismaleimide resin and polyimide resin, but are not limited thereto.

[0057] In this embodiment, the fiber resin composite material layers in the first panel and the second panel can be the same or different, the materials of each fiber resin composite material layer in the first panel can be the same or different, and the materials of each fiber resin composite material layer in the second panel can be the same or different.

[0058] The embodiment of the present invention also provides a method for preparing an electrochemical energy storage UAV cargo box, which comprises the following steps:

[0059] S1. Provide an electrochemical energy storage layer, wherein the electrochemical energy storage layer comprises a honeycomb core plate and a plurality of array-arranged battery cells embedded in the honeycomb core plate.

[0060] Specifically, the preparation method of the electrochemical energy storage layer comprises the following steps:

[0061] The required number of battery cells is obtained according to the voltage and endurance requirements of the UAV, and a honeycomb core plate (the honeycomb core plate is 1 to 2 mm thicker than the battery cell) is selected according to the size of the battery cell and the first array arrangement and the second array arrangement, and holes are opened on the honeycomb core plate. The electrically connected battery cells are placed in the holes to form a plurality of battery units arranged in the first array arrangement, and each battery unit contains a plurality of battery cells arranged in the second array arrangement, thereby obtaining an electrochemical energy storage layer.

[0062] When designing the circuit, a certain number of batteries are connected in parallel and then in series (as a battery unit). Copper wires with an insulating layer are used to connect the battery cells. The wires are first welded in groups according to the arranged array, and fuses are added to the wires extending from each group of battery cells (i.e., single-cell units). At the same time, the single-cell units are also connected in parallel first and then in series. The welded battery group (i.e., the battery cells with electrical connections completed) is then placed in the honeycomb core board with holes dug, and the wires are located on the surface of the honeycomb core board.

[0063] In addition, a heat dissipation silicone layer can be provided on both sides of the battery cell to ensure that the total thickness of the heat dissipation silicone layer and the single cell cell is equal to the thickness of the honeycomb core plate.

[0064] S2. After impregnating the fiber fabric with resin, place it on both sides of the electrochemical energy storage layer respectively, and after curing, form an electrochemical energy storage composite plate including a first panel, an electrochemical energy storage layer and a second panel stacked in sequence.

[0065] Specifically, step S2 includes the following steps:

[0066] S21, placing the fiber fabric impregnated with resin, the electrochemical energy storage layer, the demoulding cloth, the air-permeable felt and the wooden board stacked in sequence from bottom to top on the bottom plate, covering the wooden board with a vacuum bag and sealing it with the bottom plate, evacuating the vacuum bag, curing the board, and demoulding the board to obtain a first panel with the electrochemical energy storage layer bonded on the surface;

[0067] S22, placing a first panel with an electrochemical energy storage layer bonded on the surface on the bottom plate, the first panel is arranged in contact with the bottom plate, and a fiber fabric impregnated with resin, a demoulding cloth, a breathable felt and a wooden board stacked in sequence from bottom to top are placed on the electrochemical energy storage layer, a vacuum bag is covered on the wooden board and sealed with the bottom plate, vacuuming, and curing (during the curing process, the resin on the surface of the fiber fabric impregnated with resin makes the electrochemical storage layer adhere to the first panel), after demoulding, bonding a second panel to the upper surface of the electrochemical energy storage layer, thereby forming an electrochemical energy storage composite plate including the first panel, the electrochemical energy storage layer and the second panel stacked in sequence; or, The material is placed on a base plate, and then a first panel with an electrochemical energy storage layer bonded on the surface is placed on the fiber fabric impregnated with resin, the electrochemical energy storage layer is arranged on the fiber fabric impregnated with resin, and then a demoulding cloth, a breathable felt and a wooden board are stacked in sequence from bottom to top on the first panel, a vacuum bag is covered on the wooden board and sealed with the base plate, vacuuming is performed, and curing is performed (during the curing process, the resin on the surface of the fiber fabric impregnated with resin makes the second panel adhere to the electrochemical energy storage layer), and after demoulding, a second panel is bonded to the lower surface of the electrochemical energy storage layer, thereby forming an electrochemical energy storage composite plate including the first panel, the electrochemical energy storage layer and the second panel stacked in sequence.

[0068] In this step, specifically, Figure 6 As shown (the direction of the arrow is the direction of gas flow), the resin-impregnated fiber fabric 11' is placed on the base plate 2, the electrochemical energy storage layer 12 is placed on the resin-impregnated fiber fabric 11', the demoulding cloth 3 is placed on the electrochemical energy storage layer 12, the breathable felt 4 is placed on the demoulding cloth 3, the wooden board 5 is placed on the breathable felt 4, the vacuum bag 6 is covered on the wooden board 5, and the vacuum valve 8 is placed on the base plate 2. One end of the vacuum valve 8 passes through the vacuum bag 6 to communicate with the outside world, and a circle of sealing tape 7 is attached to the edge of the vacuum bag 6 that contacts the base plate 2 to achieve the sealing of the vacuum bag 6 and the base plate 2. The vacuum is evacuated and kept at room temperature for 24 hours for curing (during the curing process, the resin on the surface of the resin-impregnated fiber fabric makes the electrochemical storage layer bonded to the first panel), and after demoulding (the vacuum bag is removed, and the demoulding cloth, the breathable felt and the wooden board are separated from the first panel and the electrochemical energy storage layer as a whole), a first panel with an electrochemical energy storage layer bonded on the surface is obtained. The steps for preparing the bonded second panel on the other side of the electrochemical energy storage layer refer to the steps for preparing the first panel.

[0069] If the first panel and the second panel contain multiple layers of fiber resin composite material, multiple layers of fiber fabrics 11' impregnated with resin are stacked on the bottom plate 2, and then the above steps are referred to to obtain the first panel with the electrochemical energy storage layer bonded on the surface. At the same time, multiple layers of fiber fabrics impregnated with resin are placed on the bottom plate, or multiple layers of fiber fabrics impregnated with resin are placed on the electrochemical energy storage layer (the first panel is bonded to the lower surface of the electrochemical energy storage layer, and the first panel with the electrochemical energy storage layer bonded on the surface grid is placed on the bottom plate, and the first panel is placed on the bottom plate), and then the above steps are referred to to prepare the bonded second panel on the other side of the electrochemical energy storage layer.

[0070] The method for preparing the resin-impregnated fiber fabric comprises the following steps:

[0071] Degassing a resin (such as epoxy resin) in a vacuum chamber for 15 minutes to remove air bubbles, and then mixing the resin with a curing agent to obtain a mixture;

[0072] Pour the mixture immediately onto the fiber fabric on the polyethylene film (because the high viscosity of the cured resin will affect the impregnation of the fiber fabric, the mixture needs to be poured onto the fiber fabric immediately), and spread the mixture with a scraper to fully soak the fiber fabric. After full soaking, use a scraper to scrape off the excess mixture on the surface of the fiber fabric to prevent the mixture from dripping into the honeycomb. If the area of ​​the fiber fabric impregnated with resin is large, it can be cut according to the size of the electrochemical energy storage drone cargo box.

[0073] S3. Assemble the electrochemical energy storage composite panels to form an electrochemical energy storage UAV cargo box.

[0074] Specifically, the electrochemical energy storage composite plates can be assembled by a detachable connection method (such as riveting). Therefore, when an electrochemical energy storage composite plate fails, it can be replaced in time, and compared with one-piece manufacturing, it has a longer service life.

[0075] More specifically, Figure 7 As shown, two adjacent electrochemical energy storage composite plates 1 in the cargo box of the electrochemical energy storage UAV are fixed by a right-angle connector 9, that is, the two electrochemical energy storage composite plates are respectively against the two right-angle plates of the right-angle connector, and then connected by riveting.

[0076] The preparation method provided by the present invention has a simple process. Specifically, the electrochemical energy storage layer is prepared using a honeycomb core plate. Compared with the commonly used materials, it has a lighter weight and can reduce the weight of the whole machine; then the strength and rigidity of the honeycomb core plate after being damaged are restored by designing the arrangement of the battery cells and filling the honeycomb clay; then a heat dissipation silica gel layer is set on the surface of the battery cells arranged in the array, and the local temperature is avoided from being too high through the structure and material, and the problem of heating and bulging generated by the battery cells during the large current discharge process is solved, and the safety of the cargo drone during flight is improved. The electrochemical energy storage cargo box prepared by the above method is light in weight, has high strength and rigidity, and can protect the cargo well. The electrochemical energy storage cargo box has both storage function and electrochemical energy storage function, which can not only bear a large weight load, but also power the drone. It can also be used as a backup power supply for the cargo drone to increase the power. The electrochemical energy storage cargo box in the present invention reduces the total weight on the basis of realizing the storage and energy storage functions, realizes the lightweight of the cargo drone, and is an effective solution to solve the short flight radius, short cruising range and time of the cargo drone.

[0077] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. An electrochemical energy storage drone cargo box, characterized in that: The electrochemical energy storage UAV cargo box is enclosed by an electrochemical energy storage composite plate, and the electrochemical energy storage composite plate includes a first panel, an electrochemical energy storage layer, and a second panel stacked in sequence: The first panel and the second panel both include a fiber resin composite material layer, wherein the fiber resin composite material layer is obtained by impregnating fiber fabric with resin and curing it; The electrochemical energy storage layer includes a honeycomb core plate and a plurality of battery cells arranged in an array and embedded in the honeycomb core plate.

2. The electrochemical energy storage UAV cargo box according to claim 1 is characterized in that: The plurality of array-arranged battery cells are arranged in a first array arrangement; Each of the plurality of battery cells arranged in an array comprises a plurality of battery cells arranged in a second array arrangement, wherein the plurality of battery cells are electrically connected in parallel first and then in series, and the two wires extending from the series connection are respectively connected to fuses; The honeycomb core plate is provided with holes arranged in a first array and a second array, and the plurality of battery cells are embedded in the holes.

3. The electrochemical energy storage UAV cargo box according to claim 2 is characterized in that: The distance between two adjacent battery units is greater than the distance between two adjacent battery cells in each battery unit.

4. The electrochemical energy storage UAV cargo box according to claim 2 is characterized in that: One or two honeycombs at the edges of the holes on the honeycomb core plate arranged in the first array and the second array are filled with honeycomb cement.

5. The electrochemical energy storage UAV cargo box according to claim 1 is characterized in that: The material of the honeycomb core plate is one of aramid paper honeycomb, aluminum honeycomb with an insulating layer coated on the surface, and glass cloth honeycomb.

6. The electrochemical energy storage UAV cargo box according to claim 2 is characterized in that: The electrochemical energy storage layer also includes a heat dissipation silicone layer, which is located on the surface of the battery cell embedded in the hole, and the total thickness of the heat dissipation silicone layer and the battery cell is equal to the thickness of the honeycomb core plate.

7. The electrochemical energy storage UAV cargo box according to claim 1 is characterized in that: The first panel and the second panel each independently include a plurality of stacked fiber resin composite material layers, and the fiber fabrics in the plurality of stacked fiber resin composite material layers are each independently selected from one of carbon fiber fabric, glass fiber fabric, Kevlar fiber fabric, aramid fiber fabric and polyamide fiber fabric; The resin in the plurality of stacked fiber-resin composite material layers is a thermosetting resin, and the thermosetting resin includes one of epoxy resin, phenolic resin, polyester resin, vinyl ester resin, bismaleimide resin and polyimide resin.

8. A method for preparing an electrochemical energy storage drone cargo box, characterized in that: The steps include: Providing an electrochemical energy storage layer, the electrochemical energy storage layer comprising a honeycomb core plate and a plurality of battery cells arranged in an array and embedded in the honeycomb core plate; After impregnating the fiber fabric with resin, the fiber fabric is placed on both sides of the electrochemical energy storage layer respectively, and after curing, an electrochemical energy storage composite plate including a first panel, an electrochemical energy storage layer and a second panel stacked in sequence is formed; The electrochemical energy storage composite panels are assembled to form an electrochemical energy storage UAV cargo box.

9. The preparation method according to claim 8, characterized in that: The preparation method of the electrochemical energy storage layer comprises the following steps: Holes are opened on the honeycomb core plate according to the size of the battery cells and the first array arrangement and the second array arrangement, and the electrically connected battery cells are placed in the holes to form a plurality of battery units arranged in the first array arrangement, each battery unit containing a plurality of battery cells arranged in the second array arrangement, thereby obtaining an electrochemical energy storage layer.

10. The preparation method according to claim 8, characterized in that: After the fiber fabric is impregnated with resin, it is placed on both sides of the electrochemical energy storage layer respectively, and after curing, the steps of forming an electrochemical energy storage composite plate including a first panel, an electrochemical energy storage layer and a second panel stacked in sequence specifically include: Step A, placing the fiber fabric impregnated with resin, the electrochemical energy storage layer, the demoulding cloth, the air-permeable felt and the wooden board stacked in sequence from bottom to top on a bottom plate, covering the wooden board with a vacuum bag and sealing it with the bottom plate, evacuating the vacuum bag, curing the board, and demoulding the board to obtain a first panel with the electrochemical energy storage layer bonded on the surface; Step B, placing a first panel with an electrochemical energy storage layer bonded on the surface thereof on a bottom plate, the first panel being arranged in contact with the bottom plate, placing a fiber fabric impregnated with resin, a demoulding cloth, a breathable felt and a wooden board stacked in sequence from bottom to top on the electrochemical energy storage layer, covering the wooden board with a vacuum bag and sealing it with the bottom plate, evacuating the vacuum bag, and curing the board, after demoulding, bonding a second panel to the upper surface of the electrochemical energy storage layer, thereby forming an electrochemical energy storage composite board including the first panel, the electrochemical energy storage layer and the second panel stacked in sequence; or placing a fiber fabric impregnated with resin, The material is placed on a base plate, and then a first panel with an electrochemical energy storage layer bonded on the surface is placed on the fiber fabric impregnated with resin, the electrochemical energy storage layer is arranged on the fiber fabric impregnated with resin, and then a demoulding cloth, a breathable felt and a wooden board are stacked in sequence from bottom to top on the first panel, a vacuum bag is covered on the wooden board and sealed with the base plate, vacuuming is performed, and curing is performed. After demoulding, a second panel is bonded to the lower surface of the electrochemical energy storage layer, so as to form an electrochemical energy storage composite plate including the first panel, the electrochemical energy storage layer and the second panel stacked in sequence.

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