A heat dissipation structure of an energy storage battery pack on a UAV

Abstract

The utility model relates to an unmanned aerial vehicle upper energy storage battery pack heat radiation structure belongs to aerospace vehicle thermal management system field. Including energy storage battery pack air duct, airflow import, airflow export, the multiple holes are opened on every baffle in energy storage battery pack inside, form energy storage battery pack air duct, the hole is opened on the nose fairing, serves as airflow import, the hole is opened on the fuselage cabin section, serves as airflow export, the airflow enters the body inside from the nose fairing hole, flows through energy storage battery pack air duct, then flows out from the fuselage cabin section hole, forms complete air flow channel. The utility model can effectively radiate to high heat flux density energy storage battery pack, is applicable to the aerial vehicle under different flight height. Especially suitable for the flight environment of low air pressure high flight speed under near space height.

Description

TECHNICAL FIELD

[0001] The utility model belongs to aerospace thermal management system field relates to a kind of unmanned aerial vehicle high specific energy energy storage battery pack heat dissipation structure. BACKGROUND

[0002] The atmosphere is thin at near space height, and part of unmanned aerial vehicle flying at this height uses energy storage battery pack to provide flight power. The current development of energy storage battery pack is mainly towards light weight, miniaturization and high specific energy, so as to realize the purpose of prolonging flight time, reducing weight and saving space. On the other hand, it will also bring the problem of large heat dissipation of high specific energy energy storage battery pack and difficult heat dissipation. Because the structure of unmanned aerial vehicle is compact, it is very sensitive to energy and weight, so it is difficult to use conventional fan cooling and water cooling method, therefore, it is necessary to combine the characteristics of unmanned aerial vehicle flight and the low temperature characteristics of external environment to design the heat dissipation of battery pack structure and fuselage structure, and fully utilize the external environment for convective heat transfer. At present, the research on heat dissipation of energy storage battery pack in China mainly focuses on the heat dissipation of power battery pack of electric vehicle and the heat dissipation of small energy storage battery pack of civil micro rotor electric unmanned aerial vehicle, and the research on the heat dissipation of high specific energy high heat flux battery pack used in unmanned aerial vehicle is still very few. CONTENT OF UTILITY MODEL

[0003] The utility model solves the technical problem that the prior art is overcome, and a kind of energy storage battery pack heat dissipation structure on unmanned aerial vehicle is presented.

[0004] The technical solution of the utility model is as follows:

[0005] An energy storage battery pack heat dissipation structure on unmanned aerial vehicle includes energy storage battery pack air duct, incoming flow inlet, incoming flow outlet;

[0006] A plurality of holes are opened on the front and rear end plates of energy storage battery pack, and the internal cells are fixed by the partition plates, the interstices formed between the partition plates correspond to the end plate openings, and the energy storage battery pack air duct is formed;

[0007] Holes are opened on the nose fairing as incoming flow inlet, and holes are opened on the fuselage cabin section as incoming flow outlet;

[0008] The incoming flow enters the body interior from the hole opening of the nose fairing, enters the energy storage battery pack air duct from each hole opening of the energy storage battery pack end plate close to the nose, and then flows out from the energy storage battery pack end plate away from the nose, and then enters the atmosphere from the hole opening of the fuselage cabin section, to form a complete air flow channel.

[0009] Preferably, when the holes are opened on the front and rear end plates of energy storage battery pack, the hole size closer to the geometric center of the energy storage battery pack end plate is larger.

[0010] Preferably, a plurality of partition plates are arranged side by side in the energy storage battery pack, a plurality of cells are mounted on each partition plate, and the interstices between the partition plates form an air duct.

[0011] Preferably, the energy storage battery pack temperature changes from high in the middle to low at the four sides in the direction of the end plate.

[0012] Preferably, the energy storage battery pack end plate is arranged with a number of openings according to the internal partition gap.

[0013] Preferably, the front and rear end plates of the heat dissipation structure are consistent in the number, shape and position of openings.

[0014] The utility model has the beneficial effects compared with the prior art:

[0015] The utility model discloses a heat dissipation structure of an energy storage battery pack on an unmanned aerial vehicle based on the external environment characteristics of near space height, the flight characteristics and structural characteristics of the unmanned aerial vehicle, and can effectively dissipate heat for the high heat flux density energy storage battery pack, and is suitable for aerial vehicles at different flight heights, especially for the flight environment of low air pressure and high flight speed at near space height. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is an energy storage battery pack heat dissipation structure schematic diagram;

[0017] Figure 2 It is a fuselage heat dissipation structure schematic diagram;

[0018] Figure 3 It is an electric core temperature change curve with time. DETAILED DESCRIPTION

[0019] The utility model will be further described below in combination with examples.

[0020] The utility model discloses a heat dissipation structure of an energy storage battery pack on an unmanned aerial vehicle based on the external environment characteristics of near space height, the flight characteristics and structural characteristics of the unmanned aerial vehicle, and can effectively dissipate heat for the high heat flux density energy storage battery pack, and is suitable for aerial vehicles at different flight heights, especially for the flight environment of low air pressure and high flight speed at near space height.

[0021] This utility model discloses a heat dissipation structure for an energy storage battery pack on a drone, including an energy storage battery pack air duct, an inlet, and an outlet. Multiple partitions are arranged side-by-side inside the energy storage battery pack, with multiple battery cells mounted on each partition. Multiple holes are formed in each partition inside the energy storage battery pack, creating an air duct. An opening is made on the nose fairing 3 as an inlet 4; an opening is made on the fuselage section 5 as an outlet 6. Air enters the drone through the openings in the nose fairing, flows through the energy storage battery pack air duct, and then exits through the openings in the fuselage section, forming a complete airflow channel. When creating openings on each partition inside the energy storage battery pack, the diameter of the opening is larger closer to the center of the energy storage battery pack structure.

[0022] 1. Energy storage battery pack air duct design

[0023] Because the internal cells of energy storage battery packs have low thermal conductivity and anisotropic thermal conductivity, based on previous simulations and experiments, the cell temperature exhibits a gradient of high temperature in the center and low temperature around the edges. Therefore, heat dissipation airflow structures are designed focusing on the high-temperature cell locations, such as... Figure 1 As shown, multiple holes 2 are opened on the front and rear end plates 1 of the energy storage battery pack. The internal battery cells are fixed by partitions, and the gaps formed between the partitions correspond to the openings on the end plates, forming the air duct of the energy storage battery pack. The opening design is combined with the fuselage to allow the low-temperature, high-speed airflow during flight to flow through the internal air duct of the energy storage battery pack, thereby achieving forced convection heat transfer.

[0024] When creating openings on the front and rear end plates of an energy storage battery pack, the opening size is larger the closer it is to the geometric center of the end plate. Multiple separators are arranged side-by-side inside the energy storage battery pack, with multiple battery cells mounted on each separator. The gaps between the separators form airflow channels. The number of openings on the end plates of the energy storage battery pack depends on the arrangement of the internal separators; there are multiple openings, and each opening on the end plate corresponds one-to-one with the gaps formed between the separators. The openings on the front and rear end plates of the heat dissipation structure are consistent. That is, the number, shape, and position of the openings on the front and rear end plates of the heat dissipation structure are identical.

[0025] 2. Heat dissipation design of the chassis structure

[0026] To ensure that the low-temperature, high-speed airflow during flight can pass through the internal cooling ducts of the energy storage battery pack, perforations were designed into the nose fairing and some fuselage sections, such as... Figure 2 As shown. After the opening is made, the incoming air will enter the fuselage through the opening of the nose fairing 3, flow through the energy storage battery pack air duct, and then flow out through the opening of the fuselage section 5, forming a complete airflow channel.

[0027] The transient thermal simulation calculation is carried out on the energy storage battery pack with the heat dissipation structure and the energy storage battery pack without any heat dissipation design respectively, the external environment parameters are same under two kinds of working conditions, and the cell arrangement mode, the heating power and the initial temperature of the energy storage battery pack are same. Figure 3 .

[0028] From Figure 3 It can be seen that the maximum temperature of the cell with the heat dissipation structure is lower than that of the cell without the heat dissipation structure at each time point, and the temperature difference between the two gradually increases with the extension of time, and the temperature difference between the two reaches about 12 DEG C at the 60th minute, which shows that the heat dissipation structure design is feasible and effective.

[0029] The contents not described in detail in the utility model specification belong to the known technology of the person skilled in the art.

Claims

1. A heat dissipation structure for an energy storage battery pack on a drone, characterized in that: This includes the air duct of the energy storage battery pack, the inlet flow, and the outlet flow; Multiple holes are opened on the front and rear end plates of the energy storage battery pack. The internal cells are fixed by partitions. The gaps formed between the partitions correspond to the openings on the end plates, forming the air duct of the energy storage battery pack. An opening is made in the nose fairing as an inlet; an opening is made in the fuselage section as an outlet. The incoming airflow enters the fuselage through the openings in the nose fairing, enters the energy storage battery pack duct through the openings on the end plate near the nose, flows out from the end plate away from the nose, and then enters the atmosphere through the openings in the fuselage section, forming a complete airflow channel.

2. The heat dissipation structure for an energy storage battery pack on a drone according to claim 1, characterized in that: When making openings on the front and rear end plates of an energy storage battery pack, the opening size should be larger the closer it is to the geometric center of the end plate.

3. The heat dissipation structure for an energy storage battery pack on a drone according to claim 1, characterized in that: The energy storage battery pack has multiple partitions arranged in parallel inside, and multiple battery cells are installed on each partition. The gaps between the partitions form air ducts.

4. The heat dissipation structure for an energy storage battery pack on a drone according to claim 1, characterized in that: The temperature of the energy storage battery pack exhibits a gradient from the endplate direction, with a higher temperature in the middle and a lower temperature around the edges.

5. The heat dissipation structure for an energy storage battery pack on a drone according to claim 1, characterized in that: The number of openings on the end plate of the energy storage battery pack is arranged according to the gaps between the internal partitions.

6. The heat dissipation structure for an energy storage battery pack on a drone according to claim 1, characterized in that: The number, shape, and position of the openings on the front and rear end plates of the heat dissipation structure are consistent.

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