EVTOL battery pack mounting structure

Abstract

The utility model discloses an eVTOL battery pack installation structure which comprises a motor arm, and a battery pack is installed in the motor arm. The motor arm comprises a skin, longitudinal beams are arranged in the skin, the number of the longitudinal beams is two, the upper portion and the lower portion of each longitudinal beam are connected with the skin, a battery pack opening is formed in the bottom of the skin, an opening cover is installed on the battery pack opening, and the battery pack is installed on the longitudinal beams. The battery pack installation structure is good in maintainability, the battery pack is connected through few connecting pieces at the bottom, disassembly is easy, the positioning pin and the positioning block can be separated through vertical movement of the battery pack, meanwhile, the battery pack can be conveniently installed and disassembled through the lower opening cover, and the maintainability is good.

Description

Technical Field

[0001] The utility model relates to the technical field of aviation equipment, and in particular to an eVTOL battery pack installation structure. Background Art

[0002] The development of eVTOL (Electric Vertical Takeoff and Landing) electric vertical takeoff and landing aircraft has attracted widespread attention from aerospace companies, the automotive industry, the transportation industry, the government, the military, and academia. Aircraft that rely on electric motors rather than internal combustion engines use electric propulsion systems instead of internal combustion engine power, thereby gaining many advantages and unique qualities. The most prominent advantages are energy saving and environmental protection, high efficiency and low energy consumption, while achieving near-zero emissions, very low noise and vibration levels, and good ride comfort. It is a truly environmentally friendly aircraft. In addition, it is safe and reliable (no explosion and fuel leakage), simple structure, easy operation and use, good maintainability / low cost, and good economy. There are also many advantages in design: the overall layout is flexible, the optimal layout and unconventional / innovative layout can be adopted; aircraft with extraordinary performance can be designed to meet special purpose needs, etc.

[0003] The battery pack provides energy for the eVTOL aircraft and is heavy, so it needs to be securely installed on the electric aircraft. At the same time, the battery pack needs to be maintained frequently and also needs to be easily maintained after installation. The eVTOL aircraft is loaded with heavy batteries, and other structures need to be reduced in weight to meet the lightweight requirements. The existing battery pack is basically installed inside the fuselage, which is convenient for the removal and installation of the battery pack, but it occupies space inside the fuselage and reduces the volume of the aircraft for passengers or cargo. Although the battery pack of some models is placed inside the wing, it is not convenient to remove it, which increases the difficulty of maintenance. Utility Model Content

[0004] The purpose of the utility model is to provide an eVTOL battery pack installation structure to solve the problems mentioned in the background technology. To achieve the above purpose, the utility model provides the following technical solutions: an eVTOL battery pack installation structure, including a motor arm, a battery pack is installed inside the motor arm; the motor arm includes a skin, a longitudinal beam is provided inside the skin, two longitudinal beams are provided, the upper and lower parts of the longitudinal beams are connected to the skin, a battery pack opening is opened at the bottom of the skin, a cover is installed on the battery pack opening, and the battery pack is installed on the longitudinal beam.

[0005] Preferably, bosses and positioning blocks are respectively installed at the upper and lower ends of the longitudinal beam, and positioning pins and connecting angle pieces are respectively installed at the upper and lower ends of the battery pack, the positioning pins are installed on the positioning blocks, and the connecting angle pieces are installed on the bosses through connecting pieces.

[0006] Preferably, the end of the positioning pin is a conical structure, and the direction of the hole on the connecting angle piece is different from the direction of the positioning pin.

[0007] Preferably, tool holes are provided on both sides of the bottom of the skin.

[0008] Preferably, the boss is designed with threads on the outside, a ferrule is threadedly connected to the boss, and the ferrule cooperates with a connector to fix the angle piece.

[0009] Preferably, the connecting member comprises a bolt and a nut.

[0010] The technical effects and advantages of the utility model: the battery pack installation structure has good maintainability: the battery pack is connected by fewer connectors at the bottom, and is easy to disassemble. The positioning pin and the positioning block can be disengaged by the up and down movement of the battery pack. At the same time, the lower cover facilitates the installation and disassembly of the battery pack, and has good maintainability;

[0011] High connection strength: The battery pack is fixed on both sides by the longitudinal beam. Considering the convenience of disassembly and assembly, it is necessary to leave an installation gap. The battery pack is matched with the thread inside the clamp and the thread outside the longitudinal beam boss. When removing the battery pack, the clamp is screwed inward to leave a gap. After the battery pack is installed, the clamp is screwed outward to press the end face and the battery pack connection angle piece tightly to eliminate the gap and prevent the bolt from hanging in the air, and the connection strength is high;

[0012] Good stress form: The locating pins and connectors are connected in different directions and are arranged outside the battery pack at a long distance. They can effectively withstand the load of the battery pack in all directions, and can also withstand the bending moment of the center of gravity of the battery pack on each connection point. The stress form is good;

[0013] High installation accuracy: The positioning pins of the battery pack and the positioning blocks of the longitudinal beam have the function of self-alignment and positioning. When the battery pack is pushed up to the top, the inclined platform of the positioning pin and the positioning block of the longitudinal beam guide and position, ensuring the installation accuracy of the battery pack, so that the holes on the battery pack connecting angle pieces are aligned with the holes on the bosses on the longitudinal beam, ensuring the passability of the bolts through the holes;

[0014] Light weight and low cost: The battery pack is arranged inside the motor arm, close to the motor, effectively saving the length of the power harness and reducing the weight and cost of the power harness. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an axonometric drawing of the utility model;

[0016] Figure 2 It is an exploded view of the utility model;

[0017] Figure 3 It is an axonometric view of the skin of the utility model;

[0018] Figure 4 It is an axonometric drawing of the longitudinal beam of the utility model;

[0019] Figure 5 It is an axonometric view of the battery pack of the utility model;

[0020] Figure 6 It is a cross-sectional view of the battery pack and the longitudinal beam of the utility model at the locating pin;

[0021] Figure 7 This is a cross-sectional view of the battery pack and the longitudinal beam of the utility model at the connection corner piece;

[0022] Figure 8 This is an axonometric view of the utility model installed on an eVTOL aircraft.

[0023] In the figure, 1. battery pack installation structure; 11. motor arm; 111. skin; 1111. tool hole; 1112. battery pack opening; 112. longitudinal beam; 1121. boss; 1122. positioning block; 113. cover; 114. connector; 1141. bolt; 1142. ferrule; 1143. nut; 12. battery pack; 121. positioning pin; 122. connecting angle piece; 2. eVTOL aircraft. DETAILED DESCRIPTION

[0024] In order to make the technical means for realizing the utility model, creative features, objectives and effects easy to understand, the utility model is further explained below in conjunction with specific diagrams. In the description of the utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, an integral connection or a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two components.

[0025] Example

[0026] like Figure 8 As shown, the battery pack mounting structure 1 is mounted on the wing of the eVTOL aircraft 2, close to the motor, making it convenient to directly power the motor.

[0027] like Figure 1 and Figure 2As shown, the battery pack installation structure 1 includes a motor arm 11 and a battery pack 12. The motor arm 11 wraps the battery pack 12 to provide protection and bearing for the battery pack 12, ensuring that the battery pack 12 is securely installed. The battery pack 12 serves as the energy system of the eVTOL aircraft and is responsible for supplying power to the motor. The motor arm 11 includes a skin 111, a longitudinal beam 112, a cover 113, and a connector 114. The skin 111 is the shape of the motor arm 11 of the eVTOL aircraft 2, maintains the aerodynamic shape of the eVTOL aircraft 2, and participates in the force of the motor arm 11, and bears the shear force of the motor arm 11. The upper part of the skin 111 bears the compression load of the motor arm 11, and the lower part of the skin 111 bears the tensile load of the motor arm 11. The skin 111 can be made of aluminum alloy or carbon fiber composite material. This example uses carbon fiber composite material. The longitudinal beam 112 bears the main load of the motor arm 11, is symmetrically distributed on the left and right, provides the installation structure of the battery pack 12, bears the load of the battery pack 12 in all directions during the flight of the eVTOL, and participates in the main force transmission of the motor arm 11. The upper and lower parts of the longitudinal beam 112 are connected to the skin 111, and support each other with the skin 111 to prevent buckling. The longitudinal beam 112 is made of metal material, which can be made of steel, titanium alloy, and aluminum alloy. In this example, aluminum alloy material is used. The cover 113 maintains the integrity of the shape of the motor arm 11, blocks the battery pack opening 1112 at the bottom of the skin 111, and is a detachable structure. When the cover 113 is removed, the battery pack 12 can be installed or detached from the inside of the motor arm 11 through the battery pack opening 1112 on the skin 111. The cover 113 is made of carbon fiber composite material. The connector 114 connects the battery pack 12 to the longitudinal beam 112, fixes the battery pack 12, and transmits the force of the battery pack 12 to ensure the safety of the connection.

[0028] like Figure 3 As shown, the battery pack opening 1112 at the bottom of the skin 111 provides a passage for the battery pack 12 to enter and exit the motor arm 11. In order to ensure that the battery pack 12 does not damage the skin 111 when entering and exiting the motor arm 11, a certain safety gap needs to be left. The size of the battery pack opening 1112 is larger than the cross section of the battery pack 12, and a minimum single-side gap of 10mm is left. A tool hole 1111 is designed at the position corresponding to the connector 114 on the side of the skin 111. When disassembling or installing the connector 114, a sleeve tool is inserted through the tool hole 1111 to disassemble or install the connector 114.

[0029] like Figure 4As shown, a boss 1121 and a positioning block 1122 are designed on the longitudinal beam 112. The positioning block 1122 provides guidance and positioning for the battery pack 12 during installation. At the same time, when the battery pack 12 is installed, the positioning block 1122 cooperates with the positioning pin 121 on the battery pack 12 to bear loads in non-up and down directions, thereby reducing the bending moment of the connecting angle piece 122 at the bottom of the battery pack 12 when the battery pack 12 is subjected to force. When the battery pack 12 is installed, a safety gap of at least 10 mm is required with the structure. The connector 114 uses a bolt 1141 and a nut 1143. In this way, there will be a gap between the bolt 1141 of the connector 114 and the connecting angle piece 122 of the battery pack 12. The bolt 1141 will have a suspended section and will be subject to additional bending moment. The outer portion of the boss 1121 is designed with a thread to cooperate with the ferrule 1142. By twisting the ferrule 1142, the ferrule 1142 and the nut 1143 of the connector 114 clamp the connecting angle piece 122 of the battery pack 12 to prevent the bolt 1141 from being suspended in the air, thereby improving the safety of the connection.

[0030] like Figure 5 As shown, the positioning pin 121 designed on the upper part of the battery pack 12 is used in conjunction with the positioning block 1122 on the longitudinal beam 112 to position the battery pack 12 when installing the battery pack 12. The connecting angle piece 122 designed on the bottom of the battery pack 12 is connected to the boss 1121 on the longitudinal beam 112 through the connecting piece 114. The direction of the hole on the connecting angle piece 122 is different from the direction of the positioning pin 121, which meets the force requirements of the battery pack 12 in different directions.

[0031] like Figure 6 As shown, the end of the positioning pin 121 on the battery pack 12 is a conical structure. When installed in the motor arm 11, the end of the positioning pin 121 is relatively small. Even if there is a small position error, the end can be inserted into the hole of the positioning block 1122 and guided to accurately position the battery pack 12 and ensure that the hole on the connecting angle piece 122 at the bottom of the battery pack 12 is in the correct position.

[0032] like Figure 7As shown, the hole on the connecting angle piece 122 of the battery pack 12 is aligned with the hole inside the boss 1121 of the longitudinal beam 122, and the bolt 1141 of the connecting member 114 is inserted into the hole and cooperates with the nut 1143 on the other side. The nut 1143 is a self-locking nut to prevent the nut 1143 from loosening due to vibration or other reasons after the battery pack 12 is installed, resulting in connection failure. Since a gap for installation needs to be left between the battery pack 12 and the boss 1121 of the longitudinal beam 122, the internal thread of the ferrule 1142 is designed to cooperate with the external thread of the boss 1121. The ferrule 1142 can be rotated to achieve the movement of the ferrule 1142 on the boss 1121, so that the ferrule 1142 and the nut 1143 are clamped to connect the angle piece 122 to prevent the bolt 1141 from being suspended in the air. The outside of the ferrule 1142 is designed with a straight edge to facilitate the tool to clamp the straight edge of the ferrule 1142 for rotation. The materials of the ferrule 1142, bolt 1141 and nut 1143 are all steel.

[0033] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An eVTOL battery pack mounting structure, comprising a motor arm, characterized in that: A battery pack is installed inside the motor arm; the motor arm includes a skin, a longitudinal beam is provided inside the skin, two longitudinal beams are provided, the upper and lower parts of the longitudinal beams are connected to the skin, a battery pack opening is opened at the bottom of the skin, a cover is installed on the battery pack opening, and the battery pack is installed on the longitudinal beam.

2. The eVTOL battery pack installation structure according to claim 1, characterized in that: The upper and lower ends of the longitudinal beam are respectively installed with a boss and a positioning block, and the upper and lower ends of the battery pack are respectively installed with a positioning pin and a connecting angle piece, the positioning pin is installed on the positioning block, and the connecting angle piece is installed on the boss through a connecting piece.

3. The eVTOL battery pack installation structure according to claim 2, characterized in that: The end of the positioning pin is a conical structure, and the direction of the hole on the connecting angle piece is different from the direction of the positioning pin.

4. The eVTOL battery pack installation structure according to claim 1, characterized in that: Tool holes are arranged on both sides of the bottom of the skin.

5. The eVTOL battery pack installation structure according to claim 2, characterized in that: The boss is designed with threads on the outside, a ferrule is threadedly connected to the boss, and the ferrule cooperates with a connector to fix the angle piece.

6. The eVTOL battery pack installation structure according to claim 2, characterized in that: The connecting piece includes a bolt and a nut.

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