High-power-supply microminiature power supply for micro aircraft

Abstract

The invention discloses a high-power-supply microminiature power supply for a micro aircraft, the volume of the power supply is less than or equal to 5cm < 3 >, and the power supply comprises a miniature high-characteristic energy storage battery, a power supply control chip and a packaging shell; the micro energy storage battery is used for providing energy, the surface density of the positive electrode is 30-45mg / cm < 2 >, and the thickness of the negative electrode is 15-200mu m; the power supply control chip is connected with the positive electrode and the negative electrode of the micro energy storage battery to control power supply to the load, and the packaging shell is used for protecting the micro energy storage battery. According to the invention, the design thought of a multiplying power positive electrode and a large-current-resistant light lithium composite metal negative electrode is utilized, and the micro high-characteristic energy storage battery in a limited range is developed by utilizing the synergistic effect between the multiplying power positive electrode and the large-current-resistant light lithium composite metal negative electrode. Through the power supply control chip and the light-weight packaging shell, the output performance of the micro power supply can be maximized under the limited range condition, and the power supply capacity of the micro aircraft is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of micro power supplies, and in particular relates to a high-power micro power supply for micro aircraft. Background Art

[0002] At present, the energy supply system of micro-aircraft mainly comes from lithium batteries, hydrogen fuel, solar energy, etc. Lithium batteries have high energy density and light weight, and are currently the most commonly used energy source in micro-aircraft.

[0003] How to achieve efficient integration of various functional payloads of the aircraft and improve the endurance of the aircraft under the condition of limited power supply carried by the micro-aircraft is one of the key links in practical application. To solve this problem, on the one hand, the overall energy consumption level of the aircraft can be reduced and the energy utilization efficiency can be improved through the efficient design of the aircraft transmission system and lift system to ensure that the power system works efficiently as much as possible under its rated state; on the other hand, it is more effective to improve the power supply capacity of the micro-aircraft onboard power supply to achieve long-term operation of the flight system, and high power supply energy needs to be achieved by developing a micro power supply with high specific characteristics.

[0004] According to different sizes or weights, micro power supplies, as the name implies, are small-sized power supplies. Through heterogeneous integration technology, a micro power supply consisting of a micro high-performance energy storage unit, a power control chip and a packaging shell has been developed. It has the advantages of small size and high power output capacity to meet the higher demand for micro-aircraft in the future.

[0005] Currently, the power source provided to micro-aircraft on the market is mainly lithium-ion batteries. Lithium-ion batteries use high-voltage cobalt-lithium as the positive electrode and graphite as the negative electrode. Their energy density is low and they can only support the micro-aircraft's flight time for 3-5 minutes. It is difficult to provide high output capacity and cannot guarantee the long-term flight time of the micro-aircraft.

[0006] However, the micro power supplies for micro-aircraft prepared by the prior art have poor electrical performance when compared under the same volume or weight conditions, and cannot guarantee the multifunctional application of low-altitude unmanned equipment. The patent "A micro lithium battery structure" (CN218769669U) mainly improves the external structure of the micro cylindrical battery, improves the installation efficiency, and does not improve the electrical performance of the micro battery. The patent "Shell for micro battery and micro battery with it" (CN211320176U) is aimed at the effective insulation between the shell body and the bottom plate of the shell of the micro battery through injection molding, reducing the thickness of the shell, which does not solve the problem of poor performance of existing micro power supplies. Summary of the invention

[0007] The problem to be solved by the present invention is to provide a high-power micro power supply for micro-aircraft, which effectively solves the problem that the existing micro power supply has insufficient energy supply capacity under limited conditions (within a limited size), resulting in a short flight time of the micro-aircraft and inability to ensure equipment application.

[0008] The technical solution adopted by the present invention is: a high-power micro power supply for micro-aircraft, with a volume of ≤5cm 3 , including micro high-performance energy storage batteries, power control chips and packaging shells; micro energy storage batteries are used to provide energy, and the surface density of the positive electrode is 30-45mg / cm 2 , the thickness of the negative electrode is 15-200um; the power control chip is connected to the positive and negative electrodes of the micro energy storage battery to control the power supply to the load, and the packaging module is used to protect the micro energy storage battery;

[0009] Preparation method of the micro high-performance energy storage battery:

[0010] The rate positive electrode is prepared by mixing ternary positive electrode material, conductive agent SP and binder PVDF according to the mass ratio of (8-9.5): (1-0.3): (1-0.2) at a speed of 500-1500r / min for 1-6h and coating method. The surface density of the positive electrode is 30-45mg / cm 2 ;

[0011] The lightweight and high-current-resistant composite metal lithium negative electrode uses a lightweight, ultra-thin, highly conductive foil as a high-current current collector with a thickness of 5um-100um, and a metal lithium foil with a thickness of 10um-100um. The mixture is prepared by rolling at a pressure of 0.1-10MPa, and the thickness of the negative electrode is 15-200um.

[0012] The positive electrode and the negative electrode are laminated or wound to prepare a cell of a micro high-efficiency energy storage battery;

[0013] The positive and negative terminals of the power control chip are respectively connected to the positive and negative terminals of the micro energy storage battery by soldering, and are used to match the load, with an efficiency of 80-95%;

[0014] The packaging shell is made of lightweight thermoplastic material and printed at 150-300°C to have a thickness of 0.1-1mm. It is used as the shell of a micro energy storage battery and a power control chip. The chip and the shell are packaged by adding an appropriate amount of 1uL-10uL of ultraviolet glue at room temperature and irradiating with ultraviolet light for 10s-10min to achieve lightweight structural integration.

[0015] Furthermore, the ternary positive electrode material adopts one of the 9-series high-nickel ternary materials and the 8-series ternary materials, or a combination of two of them.

[0016] Furthermore, the lightweight, ultra-thin, highly conductive foil material is made of at least one of copper foil, copper mesh, and carbon foil.

[0017] Furthermore, the lightweight thermoplastic material is one or more of polylactic acid (PLA), nylon, photosensitive resin, and acrylonitrile-styrene-butadiene copolymer (ABS resin).

[0018] Compared with the prior art, the present invention has the advantages and positive effects of

[0019] 1. The present invention utilizes the design concept of a rate positive electrode and a high-current-resistant lightweight lithium composite metal negative electrode, and utilizes the synergistic effect between them to develop a micro high-performance energy storage battery within a confined area.

[0020] 2. Through the power control chip and lightweight packaging shell, the output performance of the micro power supply can be maximized under limited conditions, thereby improving the power supply capacity of the micro-aircraft. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of a high-power micro power supply for micro-aerial vehicles according to the present invention.

[0022] Figure 2 The discharge capacity and discharge energy curve of the rated capacity (1Ah) of the high-power micro power supply for micro-aircraft provided by the embodiment of the present invention.

[0023] Figure 3 A high-rate (5C) discharge time curve of a high-power micro power supply for micro-aircraft provided in an embodiment of the present invention.

[0024] Figure 4 Discharge curves of different rates (5C, 4C and 3C) of a high-power micro power supply for micro-aircraft provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to further understand the purpose, content and features of the present invention, the present invention is further described in detail in conjunction with the following embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] like Figure 1 As shown, the high-power micro power supply for micro-aircraft of the present invention has a volume of ≤5cm 3 , including a micro high-performance energy storage battery 1, a power control chip 2 and a packaging shell 3; the micro energy storage battery 1 is used to provide energy, and the surface density of the positive electrode is 30-45mg / cm 2, the thickness of the negative electrode is 15-200um; the power control chip 2 is connected to the positive and negative electrodes of the micro energy storage battery 1 to control the power supply to the load, and the packaging shell 3 is used to protect the micro energy storage battery 1;

[0027] Preparation method of the micro high-performance energy storage battery 1:

[0028] The rate positive electrode is prepared by mixing ternary positive electrode material, conductive agent SP and binder PVDF in a mass ratio of 8-9.5: (1-0.3): (1-0.2) at a speed of 500-1500r / min for 1-6h and coating. The surface density of the positive electrode is 30-45mg / cm 2 ;

[0029] The lightweight and high-current-resistant composite metal lithium negative electrode uses a lightweight, ultra-thin, highly conductive foil as a high-current current collector with a thickness of 5um-100um, and a metal lithium foil with a thickness of 10um-100um. The mixture is prepared by rolling at a pressure of 0.1-10MPa, and the thickness of the negative electrode is 15-200um.

[0030] Prepare a micro energy storage battery cell by laminating or winding the positive electrode and the negative electrode;

[0031] The positive and negative terminals of the power control chip 2 are respectively connected to the positive and negative terminals of the micro energy storage battery 1 by soldering, and are used to match the load, with an efficiency of 80-95%;

[0032] The packaging shell 3 is made of lightweight thermoplastic material and printed at 150-300°C to have a thickness of 0.1-1mm, which serves as the shell of the micro energy storage battery 1 and the power control chip 2. The chip and the shell are packaged by adding an appropriate amount of 1uL-10uL of ultraviolet glue at room temperature and irradiating with ultraviolet rays for 10s-10min to achieve lightweight structural integration.

[0033] Preferably, the ternary positive electrode material is one of 9 series high nickel ternary materials and 8 series ternary materials, or a combination of two of them.

[0034] Preferably, the lightweight, ultra-thin, highly conductive foil material is at least one of copper foil, copper mesh, and carbon foil.

[0035] Preferably, the lightweight thermoplastic material is one or more of polylactic acid, nylon, photosensitive resin, and acrylonitrile-styrene-butadiene copolymer.

[0036] Example 1

[0037] A high-power micro power supply for micro-aircraft, the preparation process is as follows:

[0038] (1) First, the 9-series high-nickel positive electrode material, the conductive agent SP and the binder PVDF were mixed and homogenized at a ratio of 8:1:1 at a speed of 800 r / min for 1 h, and the prepared positive electrode was prepared by a coating method. The surface density of the prepared positive electrode was 30 mg / cm 2 .

[0039] (2) rolling the 10 μm thick copper mesh and the 5 μm thick metal lithium foil at a pressure of 0.1 MPa to obtain a 15 μm thick composite metal lithium negative electrode;

[0040] (3) The positive electrode and the negative electrode are stacked to obtain a battery cell. The positive electrode and the negative electrode of the battery cell are then connected to the positive electrode and the negative electrode of the power control chip by soldering;

[0041] (4) Finally, a lightweight thermoplastic material such as nylon is used to print a 0.2 mm thick shell at 260°C as the shell of the battery and chip. Then, 1 uL of ultraviolet glue is added between the chip and the shell at room temperature and irradiated with ultraviolet light for 10 seconds. After packaging, a high-power micro power supply for micro-aircraft is obtained, with a volume of 4.5 cm 3 .

[0042] Example 2

[0043] A high-power micro power supply for micro-aircraft, the preparation process is as follows:

[0044] (1) First, 8 series high nickel cathode material, conductive agent SP and binder PVDF were mixed and homogenized at a ratio of 9.2:0.6:0.2 at a speed of 1000 r / min for 4 h, and prepared by coating method. The surface density of the prepared cathode was 35 mg / cm 2 ;

[0045] (2) rolling a 10 μm thick copper mesh and a 50 μm thick metal lithium foil at a pressure of 0.5 MPa to obtain a 60 μm thick composite metal lithium negative electrode;

[0046] (3) The positive electrode and the negative electrode are stacked to obtain a battery cell. The positive electrode and the negative electrode of the battery cell are then connected to the positive electrode and the negative electrode of the power management chip by soldering;

[0047] (4) Finally, a lightweight thermoplastic material such as ABS was used to print a 0.8 mm thick shell at 290 °C as the shell of the battery and chip. Then, 4 uL of ultraviolet glue was added between the chip and the shell at room temperature and irradiated with ultraviolet light for 1 min. After packaging, a high-power micro power supply for micro-aircraft was obtained, with a volume of 3 cm 3 .

[0048] Example 3

[0049] A high-power micro power supply for micro-aircraft, the preparation process is as follows:

[0050] (1) First, 9-series and 8-series high-nickel cathode materials, conductive agent SP and binder PVDF were mixed and homogenized at a ratio of 5.5:4:0.25:0.25 at a speed of 1200 r / min for 3 h, and the cathode was prepared by coating. The surface density of the prepared cathode was 30 mg / cm 2 ,

[0051] (2) rolling the 8 μm thick copper mesh and the 10 μm thick metal lithium foil at a pressure of 0.2 MPa to obtain a 18 μm thick composite metal lithium negative electrode;

[0052] (3) The positive electrode and the negative electrode are stacked to obtain a battery cell. The positive electrode and the negative electrode of the battery cell are then connected to the positive electrode and the negative electrode of the power management chip by soldering;

[0053] (4) Finally, a 1 mm thick shell is printed at 280 °C using a lightweight thermoplastic material such as a photosensitive resin as the shell of the battery and chip. Then, 10 uL of ultraviolet glue is added between the chip and the outer frame at room temperature and irradiated with ultraviolet light for 5 min. After packaging, a high-power micro power supply for micro-aircraft is obtained, with a volume of 3.5 cm 3 .

[0054] Example 4

[0055] A high-power micro power supply for micro-aircraft, the preparation process is as follows:

[0056] (1) First, 9-series and 8-series high-nickel cathode materials, conductive agent SP and binder PVDF were mixed and homogenized at a ratio of 2:7:0.8:0.2 at a speed of 1500 r / min for 6 h, and the cathode was prepared by coating. The surface density of the prepared cathode was 30 mg / cm 2 ,

[0057] (2) rolling the 6 μm thick copper mesh and the 80 μm thick metal lithium foil at a pressure of 1 MPa to obtain a 86 μm thick composite metal lithium negative electrode;

[0058] (3) The positive electrode and the negative electrode are stacked to obtain a battery cell. The positive electrode and the negative electrode of the battery cell are then connected to the positive electrode and the negative electrode of the power management chip by soldering;

[0059] (4) Finally, a lightweight thermoplastic material such as PLA is used to print a 0.3 mm thick frame at 300 °C as the shell of the battery and chip. Then, an appropriate amount of 6 uL of ultraviolet glue is added between the chip and the shell at room temperature, and ultraviolet light is irradiated for 60 seconds. After packaging, a micro power supply for high power supply of micro-aircraft is obtained, with a volume of 4 cm 3 .

[0060] The high specific characteristic compact positive electrode and the composite metal lithium negative electrode are both operated in a dry room with a dew point humidity lower than 1%.

[0061] The high power supply micro power supply developed by the embodiment is discharged at a current of 0.2C rate (0.2A) and the discharge capacity is 1Ah. Figure 1 As shown. The discharge energy density is 420Wh / kg, as Figure 2 As shown. Discharge at a high rate of 5C (5A) and a discharge time of 720s (12min). Figure 3 As shown. The capacity retention rates of the discharge at different rates of 5C, 4C and 3C are 93%, 96% and 98% respectively. From these test data, it can be seen that the high-power micro-power supply prepared by this patent can be discharged at a high rate, and the capacity retention rate of high-rate discharge is very high, which can support the long-term endurance of micro-aircraft equipment.

[0062] The present invention innovatively proposes a high-performance positive electrode with a multiple-rate performance, a composite metal lithium negative electrode that can withstand large currents, and a lightweight structure integrated package, etc., which solves the problem that the performance of tiny power sources within a limited area is difficult to fully exert, and realizes the application of long-endurance micro-aircraft.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-power micro power supply for micro-aircraft, with a volume of ≤5cm 3 , characterized in that, The micro energy storage battery (1) comprises a micro high-performance energy storage battery (1), a power control chip (2) and a packaging shell (3); the micro energy storage battery (1) is used to provide energy, and the surface density of the positive electrode is 30-45 mg / cm 2 , the thickness of the negative electrode is 15-200 um; the power control chip (2) is connected to the positive electrode and the negative electrode of the micro energy storage battery (1) to control the power supply to the load, and the packaging shell (3) is used to protect the micro energy storage battery (1); The preparation method of the micro high-performance energy storage battery (1): The rate positive electrode is prepared by mixing ternary positive electrode material, conductive agent SP and binder PVDF according to the mass ratio of (8-9.5): (1-0.3): (1-0.2) at a speed of 500-1500r / min for 1-6h and coating method. The surface density of the positive electrode is 30-45mg / cm 2 ; The lightweight and high-current-resistant composite metal lithium negative electrode uses a lightweight, ultra-thin, highly conductive foil as a high-current current collector with a thickness of 5um-100um, and a metal lithium foil with a thickness of 10um-100um. The mixture is prepared by rolling at a pressure of 0.1-10MPa, and the thickness of the negative electrode is 15-200um. Prepare a micro energy storage battery cell by laminating or winding the positive electrode and the negative electrode; The positive electrode and negative electrode of the power control chip (2) are respectively connected to the positive electrode and negative electrode of the micro energy storage battery (1) by soldering, and are used for matching with the load, with an efficiency of 80-95%; The packaging shell (3) is made of lightweight thermoplastic material and printed at 150-300° C. to form a shell with a thickness of 0.1-1 mm, which serves as the shell of the micro energy storage battery (1) and the power control chip (2). The chip and the shell are packaged by adding an appropriate amount of 1uL-10uL of ultraviolet glue at room temperature and irradiating with ultraviolet rays for 10s-10min to achieve lightweight structural integration.

2. The high-power micro power supply for micro-aircraft according to claim 1, characterized in that: The ternary positive electrode material is one of 9 series high nickel ternary materials and 8 series ternary materials, or a combination of two of them.

3. The high-power micro power supply for micro-aircraft according to claim 1, characterized in that: The lightweight, ultra-thin, highly conductive foil material is at least one of copper foil, copper mesh, and carbon foil.

4. The high-power micro power supply for micro-aircraft according to claim 1, characterized in that: The lightweight thermoplastic material is one or more of polylactic acid, nylon, photosensitive resin, and acrylonitrile-styrene-butadiene copolymer.

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