Unmanned aerial vehicle lithium battery aluminized packaging film and packaging structure

Abstract

The utility model discloses an aluminum-plated packaging film and packaging structure for a lithium battery of an unmanned aerial vehicle. The aluminum-plated packaging film comprises three layers of composite packaging films and a modular frame, the packaging film is composed of an outer plasma activated nylon film, a middle aluminum graphene composite barrier layer and an inner nano-silica modified polypropylene film which are compounded through a microwave anchoring technology, and has excellent water and oxygen barrier property, puncture resistance and electrolyte corrosion resistance. According to the packaging structure, a first packaging frame and a plurality of second packaging frames are combined, primary fixing is achieved through hanging buckle connection of clamping plates and clamping grooves, and then an inserting rod is pushed through a bolt to penetrate through the adjacent frames to complete rigid connection. The design ensures that heat dissipation gaps are reserved among the batteries, bumps are prevented from being extruded, and single batteries are convenient to replace. And the inserting rod is provided with a shifting block and a pressure spring and can be manually reset in the sliding hole. The lithium battery pack has the advantages of high protection performance, heat dissipation performance and modular assembly, and is particularly suitable for the lithium battery pack of the unmanned aerial vehicle.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery packaging technology, and in particular to an aluminum-plated packaging film and packaging structure for drone lithium batteries. Background Technology

[0002] With the rapid development of drone technology, the safety and reliability of lithium batteries, as their core power source, are becoming increasingly prominent issues. Currently, the packaging of lithium batteries for drones faces several key technical challenges.

[0003] 1. Battery Interaction Issues: Current drone battery packs generally employ a tightly packed assembly method, with individual battery cells in direct contact. This structure has a significant drawback: when a single battery cell bulges due to overcharging, over-discharging, or high temperature, it will directly compress adjacent batteries, triggering a chain reaction that leads to a decline in the performance of the entire battery pack or even thermal runaway. This risk is particularly pronounced in high-altitude operating environments.

[0004] 2. Insufficient heat dissipation: Traditional battery pack structures lack effective heat dissipation channels, making it difficult to quickly dissipate the heat generated during battery operation. Studies have shown that for lithium batteries operating in temperatures above 45°C, the cycle life decreases by 50% for every 10°C increase. Furthermore, in high-temperature environments during summer or under high-power output conditions, the internal temperature of the battery pack in drones can easily exceed the safety threshold.

[0005] 3. Limitations in Protective Performance: Existing battery packaging films mostly use ordinary aluminum-plastic composite film structures, whose water and oxygen barrier properties (typically oxygen permeability > 0.5 cm³ / m²·day) are insufficient to meet the long-term use requirements of drones in high-humidity environments. At the same time, traditional packaging films have insufficient puncture resistance (generally < 30N), making them susceptible to external damage during transportation or use, leading to electrolyte leakage.

[0006] 4. Poor maintenance convenience: Most existing battery packs are designed as a single encapsulated unit. When a single battery fails, the entire battery pack often needs to be replaced, resulting in wasted resources and increased maintenance costs. In addition, the traditional frame structure is difficult to disassemble, which is not conducive to the regular inspection and maintenance of batteries.

[0007] Against this backdrop, this invention effectively solves the aforementioned technical challenges through an innovative three-layer composite packaging film design and modular frame structure, providing a safer and more reliable packaging solution for drone lithium batteries. Utility Model Content

[0008] The purpose of this invention is to address the shortcomings of existing technologies that easily cause damage by squeezing adjacent batteries, and to propose an aluminum-coated packaging film and packaging structure for drone lithium batteries.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] An aluminized packaging film for a drone lithium battery, the packaging film being wrapped around the outside of the lithium battery, the packaging film including an outer protective film, which is a nylon film;

[0011] The intermediate barrier layer is an aluminum-graphene composite layer formed by vacuum evaporation.

[0012] The inner heat-sealing film is a nano-silica modified cast polypropylene film;

[0013] The outer protective film, the middle barrier layer, and the inner heat-sealing film are sequentially composited.

[0014] After the packaging film is wrapped around the lithium battery, it is sealed using a heat sealing machine. The packaging film fits the lithium battery perfectly, and there is an opening on the outside of the packaging film to easily expose the electrodes of the lithium battery.

[0015] In one possible design, the layers are bonded together using microwave anchoring technology.

[0016] In one possible design, the surface of the outer protective film is activated.

[0017] A lithium battery packaging structure for drones includes the aforementioned aluminized packaging film, as well as a first packaging frame and multiple second packaging frames.

[0018] The middle frame bars on one side of both the No. 1 and No. 2 packaging frame are provided with slots, and the middle frame bars on the opposite side of the No. 2 packaging frame are fixedly provided with plates. The top frame bars on one side of both the No. 1 and No. 2 packaging frame are provided with clearance slots.

[0019] The second packaging frame is equipped with a spring-loaded insert rod, the two ends of which penetrate the side wall of the frame. A threaded hole is opened on one side of the second packaging frame, and a slot is opened on one side of the first packaging frame.

[0020] In one possible design, a compression spring is fitted onto the outer wall of the insertion rod, with both ends of the compression spring abutting against the spring seat of the insertion rod and the inner wall of the frame, respectively.

[0021] In one possible design, the side wall of the second packaging frame has a sliding hole that connects to the inner cavity, and a lever is fixed to the outer wall of the insert rod, with the lever extending to the outside through the sliding hole.

[0022] In one possible design, the second packaging frame has a recessed surface, and the lever is confined within the recessed surface and does not protrude from the outer surface of the frame.

[0023] In this application, during actual use, after a single battery is initially packaged with a packaging film using a heat-sealing process, it is further packaged by inserting it into the first and second packaging frames through the top. Then, the bottom side of the second packaging frame is attached to the top side of the first packaging frame, and then moved from top to bottom, so that the card plate passes through the clearance groove and hooks into the inside of the slot, achieving initial connection. The remaining second packaging frames are connected to the side walls of adjacent second packaging frames using hooks. Then, the bolt is screwed into the threaded hole of the outermost second packaging frame. One end of the bolt will abut against the insertion rod, causing the insertion rod to move and insert into the inner cavity of the adjacent second packaging frame. This insertion rod will push the insertion rod in the inner cavity of the other adjacent second packaging frame to move until the insertion rod in the last second packaging frame is inserted into the slot of the first packaging frame, achieving overall connection and fixation, thereby achieving the final assembly and packaging of the battery.

[0024] In this invention, the aluminum-coated packaging film for drone lithium batteries utilizes a three-layer composite structure to synergistically enhance battery protection performance: the outer layer employs a plasma-activated biaxially oriented nylon film to provide high-strength mechanical protection and weather resistance; the middle aluminum-graphene composite barrier layer is vacuum-deposited to form a dense barrier with high oxygen permeability and electromagnetic shielding and thermal conductivity; the inner layer is a nano-silica-modified polypropylene heat-sealing film that effectively resists electrolyte corrosion and achieves a low-temperature, high-strength seal. This structure results in high overall water vapor permeability and high puncture resistance, while the nylon and polypropylene materials can be separated and recycled. This triple-protection design ensures high battery stability under impact, large temperature differences, and electromagnetic interference, while also suppressing the risk of thermal runaway through graphene thermal conductivity and nano-SiO2 buffering, making it particularly suitable for the stringent requirements of drone batteries regarding weight, safety, and environmental adaptability.

[0025] In this utility model, the aluminum-coated packaging film and packaging structure for drone lithium batteries can be connected and assembled with a first packaging frame and multiple second packaging frames through insert rods and card plates, thereby achieving the stability of the entire packaging structure.

[0026] In this utility model, the aluminum-plated packaging film and packaging structure for a drone lithium battery, through the second packaging frame and sliding hole, can achieve the following: when the plug rod is reset, even if it cannot be reset to its original position by the compression spring, it can still be reset by manually moving the exposed toggle block, thereby ensuring its practicality.

[0027] In this invention, the frame structure combined with the improved packaging film achieves the original effect while ensuring the gap between battery packs to prevent mutual interference, ensuring heat dissipation, and facilitating subsequent disassembly and replacement. Attached Figure Description

[0028] Figure 1This is a schematic diagram of the planar structure of an aluminum-coated packaging film for a drone lithium battery proposed in this utility model;

[0029] Figure 2 This is a schematic diagram of the cross-sectional structure of an aluminum-coated packaging film for a drone lithium battery proposed in this utility model.

[0030] Figure 3 This is a schematic diagram of the main structure of a lithium battery packaging structure for unmanned aerial vehicles (UAVs) proposed in this utility model.

[0031] Figure 4 This is a right-side exploded view of the lithium battery packaging structure for a drone proposed in this utility model.

[0032] Figure 5 This is a schematic diagram of the exploded left view of a lithium battery packaging structure for a drone proposed in this utility model;

[0033] Figure 6 This is a schematic diagram of the No. 2 packaging frame structure of a lithium battery packaging structure for drones proposed in this utility model;

[0034] Figure 7 This utility model Figure 6 Enlarged view of the structure of part A in the middle.

[0035] In the diagram: 1. Outer protective film; 2. Middle barrier layer; 3. Inner heat-sealing film; 4. Packaging frame 1; 5. Packaging frame 2; 6. Relief groove; 7. Slot; 8. Bolt; 9. Clamping plate; 10. Sliding hole; 11. Threaded hole; 12. Insert rod; 13. Toggle block; 14. Compression spring; 15. Slot; 16. Recessed surface. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0037] In one embodiment: Reference Figure 1-2 An aluminized packaging film for a drone lithium battery, the packaging film wrapping around the lithium battery, the packaging film comprising:

[0038] Outer protective film 1: Biaxially oriented nylon film is selected as the substrate, and its surface is activated by a plasma surface treatment machine.

[0039] Intermediate barrier layer 2 forming: An aluminum-graphene composite layer is deposited on the surface of the nylon film using a vacuum evaporation process.

[0040] Inner heat-sealing film 3: is a nano-silica modified cast polypropylene film.

[0041] Interlayer lamination: The three-layer film is laminated by pulse heating using a microwave solventless laminator with microwave anchoring technology.

[0042] The aluminum-coated packaging film for drone lithium batteries utilizes a three-layer composite structure to synergistically enhance battery protection performance: the outer layer employs a plasma-activated biaxially oriented nylon film to provide high-strength mechanical protection and weather resistance; the middle aluminum-graphene composite barrier layer, formed through vacuum evaporation, creates a dense barrier with high oxygen permeability and also provides electromagnetic shielding and thermal conductivity; the inner layer, a nano-silica-modified polypropylene heat-sealing film, effectively resists electrolyte corrosion and achieves a high-strength seal at low temperatures. This structure results in high overall water vapor permeability and high puncture resistance, while the nylon and polypropylene materials can be separated and recycled. This triple-protection design ensures high battery stability under impact, large temperature differences, and electromagnetic interference, while also suppressing the risk of thermal runaway through graphene thermal conductivity and nano-SiO2 buffering, making it particularly suitable for the stringent requirements of drone batteries in terms of weight, safety, and environmental adaptability.

[0043] refer to Figure 3-5 An assembly of a lithium battery packaging structure for drones includes: heat-sealing the aforementioned film material, and using a heat-sealing machine to three-dimensionally wrap the lithium battery cells with the aluminized packaging film to form a sealed package; the assembly also includes:

[0044] The first packaging frame 4 is located at the end, with its slot 7 opening facing upwards. Align the card plate 9 of the second packaging frame 5 with the clearance slot 6 and insert it vertically. Press it down until the card plate 9 is fully embedded in the slot 7 to achieve the connection of the first layer of frames.

[0045] Then repeat the above steps to stack multiple No. 2 packaging frame 5 to form a three-dimensional array structure.

[0046] Further reference Figure 6-7 The second packaging frame 5 has an inner cavity in the side of the frame bar, and an insert rod 12 is slidably installed inside the inner cavity. Both ends of the insert rod 12 slide through to the outside. The second packaging frame 5 has a threaded hole 11 connected to the inner cavity on one side, and the first packaging frame 4 has a slot 15 on one side.

[0047] Then, rotate the bolt 8 of the outermost second packaging frame 5 so that its end pushes the insertion rod 12 to slide along the inner cavity, so that the end of the insertion rod 12 passes through the inner cavity of the adjacent frame in turn. Then, the insertion rod 12 in the second packaging frame 5 is inserted into the slot 15 of the first packaging frame 4, thereby completing the rigid connection of all frames. Finally, multiple single batteries can be assembled in series.

[0048] By adopting a modular frame design for the packaging structure, it is possible to ensure that there are gaps between the batteries in the battery pack and that they can be stably placed, which is conducive to heat dissipation in actual use. Furthermore, because there are gaps between each battery, when a battery bulges, it can effectively reduce the compression of surrounding batteries, thereby reducing overall damage. At the same time, due to the individual design, it is easy to replace individual batteries.

[0049] This application can be used in the field of unmanned aerial vehicles (UAVs) or in other fields applicable to this application.

[0050] In another embodiment: Reference Figure 7 A lithium battery packaging structure for drones is disclosed. The second packaging frame 5 has a sliding hole 10 on the side wall of its inner cavity, which is connected to the inner cavity. A lever 13 is fixedly installed on the outer wall of the insertion rod 12, extending outward through the sliding hole 10. This allows the insertion rod 12 to be manually moved to its original position even if it cannot be reset by the compression spring 14, ensuring its practicality. Furthermore, the side wall of the second packaging frame 5 with the sliding hole 10 has a recessed surface 16, allowing the lever 13 to be exposed for easy manual control without protruding from the side of the overall frame, thus facilitating space allocation in practice.

[0051] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0052] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An aluminized packaging film for a lithium battery used in unmanned aerial vehicles (UAVs), the packaging film wrapping around the outside of the lithium battery, characterized in that, The packaging film includes: The outer protective film (1) is a nylon film; The intermediate barrier layer (2) is an aluminum-graphene composite layer formed by vacuum evaporation. The inner heat-sealing film (3) is a nano-silica modified cast polypropylene film; The outer protective film (1), the middle barrier layer (2), and the inner heat-sealing film (3) are sequentially composited. After the packaging film is wrapped around the lithium battery, it is sealed using a heat sealing machine. The packaging film fits the lithium battery perfectly, and there is an opening on the outside of the packaging film to easily expose the electrodes of the lithium battery.

2. The aluminum-coated packaging film for drone lithium batteries according to claim 1, characterized in that, The layers are bonded together using microwave anchoring technology.

3. The aluminum-coated packaging film for drone lithium batteries according to claim 2, characterized in that, The outer protective film (1) is activated on its surface.

4. A lithium battery packaging structure for drones, comprising an aluminized packaging film for drone lithium batteries as described in any one of claims 1-3, characterized in that, Also includes: Packaging frame No. 1 (4) and multiple packaging frames No. 2 (5); The middle racks on one side of the No. 1 packaging frame (4) and the No. 2 packaging frame (5) are provided with slots (7), and the middle racks on the opposite side of the No. 2 packaging frame (5) are fixedly provided with plates (9). The top racks on one side of the No. 1 packaging frame (4) and the No. 2 packaging frame (5) are provided with clearance slots (6). The second packaging frame (5) is provided with a plug rod (12) with a compression spring (14). The two ends of the plug rod (12) penetrate through the side wall of the frame. A threaded hole (11) is opened on one side of the second packaging frame (5), and a slot (15) is opened on one side of the first packaging frame (4).

5. The unmanned aerial vehicle (UAV) lithium battery packaging structure according to claim 4, characterized in that, A compression spring (14) is fitted on the outer wall of the insertion rod (12), and the two ends of the compression spring (14) abut against the spring seat of the insertion rod (12) and the inner wall of the frame, respectively.

6. The lithium battery packaging structure for unmanned aerial vehicles according to claim 5, characterized in that, The second packaging frame (5) has a sliding hole (10) on its side wall that connects to the inner cavity. The outer wall of the insert rod (12) is fixed with a lever (13), which extends to the outside through the sliding hole (10).

7. The unmanned aerial vehicle (UAV) lithium battery packaging structure according to claim 6, characterized in that, The second packaging frame (5) has a recessed surface (16), and the push block (13) is limited to the recessed surface (16) and does not protrude from the outer surface of the frame.

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