Battery box body and battery pack for hovercar

Abstract

The invention discloses a battery box body and a battery pack for an aerocar, and relates to the technical field of new energy automobiles, the battery box body comprises an upper box body, and further comprises a lower box body matched with the upper box body and used for integrally protecting the battery pack, and an internal bearing assembly used for protecting the battery pack in the box body. The structure and the sealing function of the battery box body in the power battery pack of the aircraft are reconstructed according to the use scene, the expansive force, the gravity and the maneuvering overload force of the power battery core group are directly transmitted to the bearing framework based on the independent battery pack, and then the bearing structure is simplified through the bearing of the mounting point of the aircraft; and the upper box body and the lower box body which are made of lightweight materials are combined to realize a sealing function, redundant parts of the battery pack are omitted, the connection between the lower box body and the bearing framework is further lightened, and meanwhile, the internal structure is further improved to improve the heat management capability.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and in particular to a battery box body and a battery pack for a flying vehicle. Background Art

[0002] With the development of the low-altitude economy, the application of power batteries in flying vehicles is becoming more and more extensive. Flying vehicles also belong to a category of new energy vehicles.

[0003] Due to the increase in the load of flying vehicles, power battery cell groups with larger power are being applied to flying vehicles. The original form of installing soft-pack battery cell groups or cylindrical battery cells in plastic cases used in small drones cannot meet the requirements of the battery box body for flying vehicles with increasing power demand because the plastic frame has insufficient load-bearing capacity. As described in patents CN116487806A, CN 204614830U, and CN 107004919B, they are all battery box body structures based on small-power batteries, with small load-bearing capacity and unable to meet the load-bearing requirements of large-power flying vehicle power batteries. For example, the application requirements for a power battery cell group with an energy of ≥5 kWh and a cell group weight of 10 kg - 1000 kg.

[0004] Another current technical route for the power battery box body of flying vehicles is to follow the structure form of automotive power batteries. As described in CN117525716A, the advantage of this patent is that it saves some battery structural parts by using wing ribs while following the structure of automotive power batteries. There are many preconditions for using wing ribs as part of the power battery box body in this patent, which cannot be actually promoted, and battery replacement and maintenance are difficult. The application scenarios and related standard requirements of automotive power battery box bodies are quite different from those of flying vehicles. For example, automobiles have safety requirements for collision, low-frequency vibration, extrusion, and bottom bumping scenarios, while flying vehicles have safety requirements for high-frequency vibration, crash impact, etc. and ultra-lightweight requirements. The weight ratio of the structural parts of the battery box body in the battery pack of this technical route is still relatively large, about 15 - 30%. For flying vehicles, the weight of redundant structural parts will seriously affect the endurance and load capacity of flying vehicles.

[0005] Another patent CN 219226479 uses a three-layer composite material as the power battery box body, but does not solve the problem of battery cell grouping and the fixing and load-bearing force methods in the box body. The power battery cells used in flying vehicles usually expand to a certain extent along the lamination direction of the battery cells during the charge and discharge process and the service life cycle. The common expansion force of battery cells is about 50 kPa - 300 kPa (related to the specific specifications and models of the battery cells). It is necessary to appropriately restrain the expansion of the battery cells through module or box body structural parts to ensure the normal operation of the battery cells. This patent does not solve the problem of power battery cell expansion, which will lead to a reduction in the cycle life of the battery cells and an increased risk of thermal runaway.

[0006] And during use, the thermal management effect of the power battery is relatively poor. Summary of the Invention

[0007] The technical solution of the present invention aims at the technical problem that the existing technical solutions are too single, and provides a solution significantly different from the existing technologies. Embodiments of the present invention provide a battery box body and a battery pack for a flying car to solve the problems that the existing power battery pack for a flying car and its attached box body can meet the usage requirements of high endurance, high safety, and convenient maintenance for the power battery of a large-capacity flying car during use.

[0008] Embodiments of the present invention adopt the following technical solutions: A battery box body and a battery pack for a flying car, including an upper box body, and further including a lower box body used in cooperation with the upper box body to protect the battery pack as a whole, an internal bearing assembly used to protect the battery pack inside the box body, and a side wall protection mechanism used to cooperate with the internal bearing assembly to strengthen the protection of the battery pack.

[0009] Further, the internal bearing assembly includes a bottom plate, expansion beams, and longitudinal beams. The longitudinal beams are arranged between two groups of battery packs, and the expansion beams are respectively located at the front and rear ends of the battery packs, and the expansion beams are of a hollow structure.

[0010] Further, the front expansion beam is connected to the bottom plate, the front expansion beam is connected to the longitudinal beam, the rear expansion beam is connected to the bottom plate, and the rear expansion beam is connected to the longitudinal beam. The connection is by welding, riveting, screwing, or other composite connection methods.

[0011] The expansion beam assembly is provided with several thermal management components for improving the battery thermal management ability. The expansion beam assembly is divided into integrally formed and semi-integrally formed according to different usage requirements. The inner wall of the expansion beam assembly is provided with several guiding installation grooves, which are divided into transverse sliding grooves and vertical installation sliding grooves. The expansion beam assembly contacts the relatively larger end face of the battery cell, and the opening direction of the expansion beam assembly is the advancing direction of the flying car. When the thermal management component needs to be installed, the expansion beam assembly is semi-integrally formed at this time. The side wall of the expansion beam assembly in contact with the battery cell is connected to the frame by plug-in connection, and the connection part is made of elastic sealing material. The thermal management component includes a guiding plate and a supporting plate. The guiding plate and the supporting plate are connected by a rotating shaft, and the guiding plate and the supporting plate are connected to the transverse sliding groove of the guiding installation groove by a plurality of rotating connection blocks, and the guiding plate and the supporting plate are rotatably connected to the corresponding rotating connection blocks. An installation slider is arranged outside the rotating connection block connected to the guiding plate. The installation slider and the nickel-titanium alloy memory spring are provided. An angle limiting block is installed in the vertical installation sliding groove in the guiding installation groove. A moving limiting groove is opened in the angle limiting block, and a matching block for controlling the opening angle of the guiding plate is arranged in the moving limiting groove. A limiting block for controlling the installation position of the supporting block is arranged on the angle limiting block.

[0012] A partition plate is arranged between the side wall of the expansion beam assembly and the frame. An insertion block that abuts against the angle limiting block is arranged at the end of the partition plate, and the insertion block is conical.

[0013] Furthermore, the power battery assembly includes a power battery cell group, a low-voltage acquisition assembly, a high-voltage component assembly, a battery management system, and high-low voltage plugs. The power battery cell group is connected to the battery management system through the low-voltage acquisition assembly and the high-voltage component. The battery management system is connected to the vehicle body through the high-low voltage plugs. The distribution and arrangement direction of the battery cells inside the power battery cell group is not a fixed direction.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: On the premise of ensuring the normal functions of each part of the battery pack in the application scenario of the flying car, the weight of the battery box structure is greatly reduced. A large number of lightweight materials and hollow designs are adopted to achieve further lightweighting and improve the load capacity and endurance of the aircraft.

[0015] In the scenario of the flying car crashing, even if the battery pack is severely impacted and deformed, because the inner wall of the battery box is an insulating structure, the positive and negative electrodes of the battery cells and other high-voltage connection components are not likely to short-circuit and catch fire, reducing the risk of thermal runaway.

[0016] The battery pack is an independent structure and is not integrated with the aircraft body structure, which is convenient for replacement and maintenance.

[0017] Since this battery power pack is designed for flying cars, the gas flow rate is relatively fast during flight. Using a through-type expansion beam assembly, gas will pass through the expansion beam assembly. This gas flow can remove additional heat from the battery, thereby improving the heat dissipation effect. During use, the guide plate and support plate cooperate to form a raised channel on the inner wall of the expansion beam assembly. When the channel is provided with a raised channel, the heat dissipation effect is improved. (Smooth surfaces easily form laminar boundary layers with low turbulence intensity and low heat transfer efficiency. The raised structure disturbs the airflow, turning laminar flow into turbulent flow, enhancing mixing between the fluid and the solid surface, thereby improving heat transfer efficiency.) The higher the raised channel, the stronger the disturbance effect. Therefore, the height of the raised channel in this expansion beam assembly can be adjusted according to actual conditions. At the same time, when the raised channel height can be adjusted, compared with existing fixed raised channels, which are prone to dust accumulation and affect the heat dissipation effect over time, when enhanced heat dissipation is not required, the inner wall of the channel is actually relatively flat, making it difficult for dust to adhere. And because the expansion coefficient of the battery changes with the service life, the existing beam can limit the battery. However, since the battery cell will expand, if the shell cannot release the expansion of the battery cell, the shell will cause excessive squeezing force on the battery cell, which will also affect the life of the battery cell. For this reason, the hollow and state-changeable expansion beam assembly in the present invention can avoid the battery cell expansion causing excessive stress between the battery cell and the expansion beam assembly, which affects the life of the battery cell. In addition, as the battery cell is charged and discharged many times, the expansion coefficient of the battery cell will change, and the upper temperature limit of the battery cell will also change during use, so that the upper limit of the protrusion angle in the expansion beam assembly is also related to the upper temperature limit of the battery cell.

[0018] In summary, the present invention reconstructs the structure and sealing function of the battery box in the flying car power battery pack based on the usage scenario. Based on the independent battery pack, the expansion force, gravity, and maneuvering overload force of the power cell group are directly transmitted to the load-bearing frame, and then to the aircraft mounting point to simplify the load-bearing structure. The sealing function is achieved by assembling the upper and lower boxes made of lightweight materials, eliminating redundant components in the battery pack, and further lightweighting the connection between the lower box and the load-bearing frame. In summary, by optimizing the battery box structure, the battery box is made to fit the flying car better and achieve lightweight. At the same time, the structure of the expansion beam of the load-bearing frame integrates the battery cell thermal management function, thereby improving the service life of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 Schematic diagram of the main structure of the present invention; Figure 2 Schematic diagram of the structure of the lower box body and the power battery assembly of the present invention; Figure 3 Schematic diagram of the exploded structure of the main body of the present invention; Figure 4 Schematic diagram of the position distribution structure of the battery cell and the expansion beam of the present invention; Figure 5 For the present invention Figure 4 Schematic diagram of the sectional structure at A-A in; Figure 6 Schematic diagram of the comparison of the weight of the box body of the present invention and the box body of the battery cells with the same energy; Figure 7 Schematic diagram of the analysis of the restraint of the expansion force of the battery cells of the present invention; Figure 8 Schematic diagram of the connection structure between the expansion beam assembly and the lower box body of the present invention; Figure 9 Schematic diagram of the side sectional structure of the expansion beam assembly of the present invention; Figure 10 Schematic diagram of the internal structure of the expansion beam of the present invention; Figure 11 Schematic diagram of the connection structure between the guide plate and the support plate of the present invention; Figure 12 Schematic diagram of the main frame structure of the expansion beam assembly of the present invention; Figure 13 Schematic diagram of the connection structure between the angle limiting block and the mating block of the present invention; Figure 14 Schematic diagram of the connection structure between the expansion beam assembly and the thermal management assembly of the present invention. [[ID=I]]

[0021] Reference numerals: 1. Upper box body; 2. Power battery assembly; 21. Power cell group; 22. Low-voltage acquisition assembly; 23. High-voltage component assembly; 24. Battery management system; 25. High and low voltage plug-in; 3. Internal bearing assembly; 31. Bottom plate; 32. Longitudinal beam; 33. Expansion beam assembly; 4. Lower box body; 5. Thermal management assembly; 51. Guide installation groove; 52. Partition board; 53. Rotating connection block; 54. Guide plate; 55. Matching block; 56. Support plate; 57. Limit block; 58. Insert block; 59. Angle limit block; 510. Nitinol memory spring; 511. Installation slider. Detailed implementation mode

[0022] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments.

[0023] The components of the embodiments of the present invention usually described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the present invention claimed, but merely represents the selected embodiments of the present invention.

[0024] All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. Embodiment

[0027] The following combination Figures 1 to 7As shown in the figure, an embodiment of the present invention provides a battery box body and a battery pack for a flying car, including an upper box body 1, a lower box body 4 used in cooperation with the upper box body 1 for overall protection of the battery pack, and an internal bearing assembly 3 for protecting the battery pack inside the box body.

[0028] During operation, the protection performance of the box body needs to be considered. For this reason, the main bodies of the upper box body 1 and the lower box body 4 are made of metal materials, and an insulating coating is attached to the inner wall, such as spraying an epoxy resin insulating layer, etc. The insulating coating on the inner wall can ensure that in the case of an aircraft crash or a battery pack impact, there will be no risk of thermal runaway caused by short - circuit of the battery cells or high - voltage components.

[0029] Or the main bodies of the upper box body 1 and the lower box body 4 are formed by fiber - resin composite materials, such as glass fiber + resin (e.g., RTM or PCM forming), carbon fiber reinforced plastics and other technologies known to those skilled in the engineering field. For the box body formed by fiber - resin composite materials, because the material itself is insulating, it can also ensure that in the case of an aircraft crash or a battery pack impact, there will be no risk of thermal runaway caused by short - circuit of the battery cells or high - voltage components.

[0030] Or the main bodies of the upper box body 1 and the lower box body 4 are formed by a 1.1 - mm - thick glass fiber + resin prepreg compression molding process (i.e., PCM forming). It has a high degree of lightweight, high stiffness, simple forming, and relatively low cost. Moreover, the material is intrinsically insulating, which can ensure that in the case of a flying car crash or a battery pack impact, there will be no risk of thermal runaway caused by short - circuit of the battery cells or high - voltage components.

[0031] Specifically, the internal bearing assembly 3 includes a bottom plate 31, an expansion beam assembly 33, and a longitudinal beam 32. The longitudinal beam 32 is arranged between two groups of battery packs. The expansion beam assemblies 33 are respectively located at the front and rear ends of the battery packs, and the expansion beam assembly 33 is of a hollow structure. Since the expansion beam assembly 33 is arranged at the front and rear ends, that is, at the larger end face of the battery cells, it shows that there are at least 2 expansion beam assemblies 33.

[0032] The flying car belongs to the application scenario of medium maneuvering overload and large - weight battery packs. The bottom plate 31, the front expansion beam assembly 33, the rear expansion beam assembly 33, and the battery pack fixing brackets are all formed by extrusion of 6061 aluminum alloy. The longitudinal beam 32 is formed by stamping 2 - mm - thick 5083 aluminum alloy, meeting the requirements of lightweight, high load - bearing, high stiffness, and low cost.

[0033] Specifically, the front expansion beam assembly 33 is connected to the bottom plate 31, the front expansion beam assembly 33 is connected to the longitudinal beam 32, the rear expansion beam assembly 33 is connected to the bottom plate 31, and the rear expansion beam assembly 33 is connected to the longitudinal beam 32. The connection is by welding, riveting, screwing, or other composite connection methods. At this time, the partition plates 52 in the expansion beam assembly 33 are distributed at an oblique angle.

[0034] The load-bearing framework is the main load-bearing part of the battery pack, which bears the pre-tightening pressure of the battery cells, the expansion force of the battery cells during operation, the weight of the battery cells and the dynamic overload, the weight of other components of the battery pack and the dynamic overload, and is directly connected to the mounting point of the battery pack and the flying car.

[0035] The load-bearing framework is mainly composed of a bottom plate 31, longitudinal beams 32, a front expansion beam, a rear expansion beam, and battery pack fixing brackets.

[0036] Part or all of the load-bearing framework can be made of aluminum alloy, magnesium alloy, carbon fiber reinforced plastic, steel, titanium alloy or other metal materials to meet the requirements of lightweight, high load-bearing and high stiffness.

[0037] During operation, several battery pack fixing brackets are integrally formed or welded to the front expansion beam assembly 33 and the rear expansion beam assembly 33 respectively.

[0038] Both the front expansion beam assembly 33 and the rear expansion beam assembly 33 are in large-area contact with the battery cells, bearing the pre-tightening pressure of the battery cells and the expansion force of the battery cells during operation.

[0039] The longitudinal beam 32 connects the front expansion beam assembly 33 and the rear expansion beam assembly 33, bearing the pre-tightening pressure of the battery cells and the expansion force of the battery cells during operation.

[0040] The bottom plate 31 is located below the power battery cell group 21, bearing the weight of the battery cells and the dynamic overload.

[0041] Part of the overlapping area between the lower box body 4 and the bottom plate 31 is hollowed out. As Figure 5 shown, the square area is the hollowed-out area of the lower box body 4, and the return frame area is the bonding and sealing area between the lower box body 4 and the bottom plate 31 to achieve further lightweight and facilitate heat dissipation of the battery cells.

[0042] The expansion of the power battery cell group 21 during operation is restricted by the connection of the front expansion beam assembly 33, the rear expansion beam assembly 33 and the longitudinal beam 32 of the load-bearing framework.

[0043] The weight and dynamic overload of the battery pack are transmitted from each component of the load-bearing framework to the battery pack fixing brackets and then to the aircraft.

[0044] The low-voltage acquisition assembly 22 is mainly responsible for acquiring information such as voltage and temperature inside the battery pack, and transmitting it to the battery management system 24 to realize the low-voltage acquisition function of the battery pack. It is a part of the battery pack and belongs to the known technology of those skilled in the art.

[0045] The high-voltage component assembly 23 forms a high-voltage circuit by connecting the battery cells and other high-voltage devices inside the battery pack in series and parallel to realize the high-voltage function of the battery pack. It is a part of the battery pack and belongs to the known technology of those skilled in the art.

[0046] The battery management system 24 realizes the battery management function and the input / output energy function of the battery pack. It is a part of the battery pack and belongs to the known technology of those skilled in the art.

[0047] The high- and low-voltage plug-in 25 realizes the functions of input / output energy of the battery pack, transmitting control signals, and transmitting acquisition signals. It is a part of the battery pack and belongs to the known technical working principle of those skilled in the art. Embodiment

[0048] The following is combined with Figures 8 to 13 as shown; A plurality of thermal management components 5 for improving the battery thermal management ability are arranged in the expansion beam assembly 33. The expansion beam assembly 33 is divided into an integrally formed type and a semi-integrally formed type according to different usage requirements. A plurality of guiding installation grooves 51 are formed in the inner wall of the expansion beam assembly 33. The guiding installation grooves 51 are divided into transverse sliding grooves and vertical installation sliding grooves. The expansion beam assembly 33 contacts the relatively larger end face of the battery cell, and the opening direction of the expansion beam assembly 33 is the advancing direction of the flying car. When the thermal management component 5 needs to be installed, the expansion beam assembly 33 is in a semi-integrally formed state at this time. A plug-in connection is adopted between the side wall of the expansion beam assembly 33 in contact with the battery cell and the frame, and the connection part is made of an elastic sealing material. The thermal management component 5 includes a guiding plate 54 and a supporting plate 56. The guiding plate 54 and the supporting plate 56 are connected by a rotating shaft, and the guiding plate 54 and the supporting plate 56 are connected to the transverse sliding groove of the guiding installation groove 51 through a plurality of rotating connection blocks 53. The guiding plate 54 and the supporting plate 56 are rotatably connected to the rotating connection blocks 53 to which they are connected. An installation slider 511 is arranged on the outside of the rotating connection block 53 connected to the guiding plate 54. The installation slider 511 and the nickel-titanium alloy memory spring 510 are provided. An angle limiting block 59 is installed in the vertical installation sliding groove in the guiding installation groove 51. A moving limiting groove is formed in the angle limiting block 59. A matching block 55 for controlling the opening angle of the guiding plate 54 is arranged in the moving limiting groove. A limiting block 57 for controlling the installation position of the supporting block is arranged on the angle limiting block 59. The limiting block 57 and the moving limiting groove can be locked through a fastening bolt.

[0049] In summary, compared with the expansion beam assembly 33 in Embodiment 1, the expansion beam assembly 33 in Embodiment 1 is integrally formed and is for a flying car with a relatively small load and low heat generation. The expansion beam assembly 33 in Embodiment 2 is made in a split type and is for a flying car with a large load, a high battery heat generation amount, and a large deformation amount.

[0050] The nickel-titanium alloy memory spring 510 described above uses an industrial-grade memory alloy. The nickel-titanium alloy memory spring 510 combines the mechanical properties of a traditional spring and the unique functions of a shape memory alloy.

[0051] A partition plate 52 is provided between the side wall of the expansion beam assembly 33 and the frame. An insert block 58 is provided at the end of the partition plate 52, which contacts the angle limiting block 59. The insert block 58 is tapered. Since the angle limiting block 59 moves up and down, it is necessary to ensure the limiting function of the stop block 57. Therefore, a T-shaped slot is used to connect the angle limiting block 59 and the stop block 57 for sliding connection. This ensures that the movement of the angle limiting block 59 does not cause the stop block 57 to move synchronously, but can still provide a longitudinal limit engagement for the stop block 57. Alternatively, the angle limiting block 59 and the stop block 57 are fixedly connected. In this case, the height of the stop block needs to be controlled so that when the angle limiting block 59 drives the stop block 57 to slide, it still contacts the rotating connection block 53.

[0052] During use, the directions of the expansion beam assembly 33 and the large end faces of the battery cells will be adjusted according to the maneuvering overload and the upper limit of the load. For example, in the process where a stronger thermal management effect is required, a semi-integrated molding can be selected. The main frame of the expansion beam assembly 33 is integrally molded, that is, a U-shaped frame with a guide mounting groove 51, and the side walls in contact with the large end faces of the battery cells are spliced with the main frame. The splicing between the main frame and the side walls is snap-fit splicing, and the contact parts are made of elastic sealing material. Due to the use of elastic sealing material (the role of the elastic sealing material at this time is to ensure the sealing and prevent water from entering the box body, and the second role is that when the side wall is impacted by the expansion of the battery cell end face, the side wall will squeeze the elastic sealing material, so that the side wall has a certain displacement ability, thereby avoiding a rigid connection between the side wall and the main frame. When the battery cell expands significantly, the stress between the battery cell and the side wall is too large, thereby affecting the service life of the battery cell); At the same time, when the expansion beam assembly 33 is distributed, if the heat distribution of the battery cell assembly is relatively uneven (because expansion beam assemblies 33 for gas circulation are provided on both sides of the battery cell, the heat dissipation effect at both ends is relatively stronger, making the middle hot and the two sides cold), a through channel can be opened at the bottom of the lower shell, and the gas can enter the through channel, and an additional group of expansion beam assemblies 33 is provided in the middle position of the power battery cell group 21, and the middle group of expansion beam assemblies 33 is connected to the bottom through channel. When the gas passes through the bottom through channel, part of the heat can be taken away by gas circulation, thereby reducing the uneven heat phenomenon. When the sidewall expansion beam assembly 33 is in use, the thermal management assembly 5 provided therein can intervene in the operation. When operating relatively smoothly, as the energy of the battery cells is continuously output, the battery cells will gradually release heat. Since the flight speed is relatively low, the gas flow rate entering the channels in the expansion beam assembly 33 will also be relatively slow, causing the temperature in the expansion beam assembly 33 to gradually rise. At this time, the nickel-titanium alloy memory spring 510 will reset due to the temperature effect, thereby pushing the guide plate 54 to move inward. Since the guide plate 54 is rotatably connected to the support plate 56, and the end position of the support plate 56 is restricted by the limit block 57, when the guide plate 54 is pushed, since the support plate 56 cannot move, the guide plate 54 will fold along the rotational connection, so that the guide plate 54 and the support plate 56 form a convex state. When the convex state is formed, during gas flow, the heat dissipation effect can be improved. At the same time, the higher the temperature, the more obvious the inclined state of the support plate 56 of the guide plate 54 (i.e., the higher the convexity), and the better the heat dissipation effect. When the temperature drops, the nickel-titanium alloy memory spring 510 will reset, thereby driving the guide plate 54 and the support plate 56 to reset. At this time, the convex angle is small and its surface is relatively flat, thus avoiding dust accumulation caused by an overly large and constant convex state and affecting heat dissipation; When the battery cells expand, they will squeeze the sidewall at this time. The sidewall squeezes the connected elastic sealing material, and at the same time, the sidewall will be in a displaced state. When the sidewall is displaced, it drives the partition plate 52 connected thereto to move synchronously. The movement of the partition plate 52 drives the insertion block 58 connected thereto to move. The movement of the insertion block 58 drives the angle limiting block 59 slidably connected above it to move upward. At this time, the gap between the angle limiting block 59 and the mating block 55 increases. When the guide plate 54 inclines, it will drive the mating block 55 to incline at the same time. By controlling the gap between the angle limiting block 59 and the mating block 55, the tilt angle of the guide plate 54 can be controlled. Therefore, the expansion of the battery cells will also cause the gap between the angle limiting block 59 and the mating block 55 to change, thereby realizing the tilt angle of the guide plate 54 using the expansion of the battery cells.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery box for a flying car, comprising an upper box body (1), characterized in that; It also includes a lower box body (4) used in cooperation with the upper box body (1) to provide overall protection for the battery pack, and an internal bearing component (3) used to protect the battery pack inside the box body.

2. The battery box for a flying car power battery pack according to claim 1, characterized in that; The upper box body (1) and the lower box body (4) form the outer shell sealing structure of the battery pack.

3. The battery box for a flying car power battery pack according to claim 1, characterized in that; The internal bearing component (3) includes a bottom plate (31), an expansion beam component (33) and a longitudinal beam (32). The longitudinal beam (32) is arranged between two groups of battery packs. The expansion beam components 33 are respectively located at the front and rear ends of the battery pack, and the expansion beam component (33) has a hollow structure.

4. The battery box for a flying car power battery pack according to claim 3, characterized in that; The front expansion beam component (33) is connected to the bottom plate (31), the front expansion beam component (33) is connected to the longitudinal beam (32), the rear expansion beam component (33) is connected to the bottom plate (31), and the rear expansion beam component (33) is connected to the longitudinal beam (32). The connection is by welding, riveting, screwing or other methods such as composite connection.

5. The battery box for a flying car power battery pack according to claim 3, characterized in that; A number of thermal management components (5) for improving the battery thermal management ability are arranged in the expansion beam component (33). The expansion beam component (33) is divided into an integrally formed type and a semi-integrally formed type according to different usage requirements. A number of guiding installation grooves (51) are opened on the inner wall of the expansion beam component (33). The guiding installation grooves (51) are divided into transverse sliding grooves and vertical installation sliding grooves. The expansion beam component (33) contacts the relatively larger end face of the battery cell, and the opening direction of the expansion beam component (33) is the advancing direction of the flying car. When the thermal management component (5) needs to be installed, at this time the expansion beam component (33) is in a semi-integrally formed state. The side wall of the expansion beam component (33) in contact with the battery cell is connected to the frame by plug-in connection, and the connection part is made of an elastic sealing material. The thermal management component (5) includes a guiding plate (54) and a supporting plate (56). The guiding plate (54) and the supporting plate (56) are connected by a rotating shaft, and the guiding plate (54) and the supporting plate (56) are connected to the transverse sliding groove of the guiding installation groove (51) by a plurality of rotating connection blocks (53). The guiding plate (54) and the supporting plate (56) are rotatably connected to the corresponding rotating connection blocks (53). An installation slider (511) is arranged on the outside of the rotating connection block (53) connected to the guiding plate (54). A nickel-titanium alloy memory spring (510) is arranged between the installation slider (511) and the rotating connection block (53). An angle limiting block (59) is installed in the vertical installation sliding groove in the guiding installation groove (51). A moving limiting groove is opened in the angle limiting block (59), and a matching block (55) for controlling the opening angle of the guiding plate (54) is arranged in the moving limiting groove. A limiting block (57) for controlling the installation position of the supporting plate (56) is arranged on the angle limiting block (59).

6. The battery box for a flying car power battery pack according to claim 5, characterized in that; A partition plate 52 is arranged between the side wall of the expansion beam component (33) and the frame. An insertion block (58) that abuts against the angle limiting block (59) is arranged at the end of the partition plate 52, and the insertion block (58) is in a conical shape.

7. A power battery pack for a flying car, characterized in that; Power battery assembly (2), the power battery assembly (2) includes a power cell group (21), a low-voltage acquisition assembly (22), a high-voltage component assembly (23), a battery management system (24), and a high-low voltage plug-in (25). The power cell group (21) is connected to the battery management system (24) through the low-voltage acquisition assembly (22) and the high-voltage component assembly (23). The battery management system (24) is connected to the vehicle body through the high-low voltage plug-in (25). The arrangement direction of the internal cells in the power cell group (21) is not a fixed direction.

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