A battery box and a battery pack for an air car

Abstract

The application discloses a battery box and a battery pack for a flying car, and relates to the technical field of new energy vehicles, which comprises an upper box body, a lower box body used in cooperation with the upper box body for overall protection of the battery pack, and an internal bearing assembly for protection of the battery pack in the box body. The application reconstructs the structure and sealing function of the battery box in the power battery pack of the flying vehicle according to the use scene, directly transmits the expansion force, gravity and motor overload force of the power battery pack to the bearing framework, and then to the bearing of the mounting point of the flying vehicle, so as to simplify the bearing structure, realize the sealing function by assembling the upper and lower box bodies made of light materials, reduce the redundant components of the battery pack, further lighten the connection between the lower box body and the bearing framework, and further improve the heat management capacity by improving the internal structure.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of new energy vehicles, and in particular to a battery box for a flying vehicle and a battery pack. BACKGROUND

[0002] With the development of low-altitude economy, power batteries are increasingly widely applied to flying vehicles, and flying vehicles also belong to a type of new energy vehicles.

[0003] Due to the increase in the load of flying vehicles, power battery groups with larger and larger electric capacity are applied to flying vehicles. The original power battery formed by installing soft-pack battery groups or cylindrical battery groups in a plastic shell used on small unmanned aerial vehicles cannot meet the demand of the battery box of a flying vehicle with a larger and larger demand for electric capacity, because the plastic frame cannot bear enough load. As described in patents CN116487806A, CN204614830U and CN107004919B, all of which are battery box structures based on small-capacity batteries, the load is small, and the battery box cannot meet the bearing demand of the power battery of a flying vehicle with a large electric capacity, for example, the application demand of a power battery with an energy of greater than or equal to 5kwh and a battery group weight of 10kg-1000kg.

[0004] Now, another latest technology route of a flying vehicle power battery box is to use the structure of a vehicle power battery. As described in CN117525716A, the advantage of this patent is that the structure of a vehicle power battery is used while the wing rib plate is used to save part of the battery structure. The patent uses the wing rib plate as part of the power battery box, which has many prerequisites and cannot be practically popularized. In addition, the battery replacement and maintenance are difficult. The application scenarios and related standard requirements of a vehicle power battery box are quite different from those of a flying vehicle. For example, a vehicle has collision, low-frequency vibration, extrusion and bottom collision scenarios, and a flying vehicle has high-frequency vibration, crash impact and other scenario safety requirements and ultra-lightweight requirements. The weight proportion of the battery box structure in the battery pack of this technology route is still large, about 15-30%. For a flying vehicle, the weight of the structure of the redundant design seriously affects the endurance and load capacity of the flying vehicle.

[0005] Another patent CN219226479 uses a three-layer composite material as a power battery box, but does not solve the problem of the grouping and fixing and bearing stress mode of the battery cells in the box. The power battery cells used in a flying vehicle will expand to a certain extent along the direction of the laminated sheets of the battery cells during the charging and discharging process and in the service life, and the common expansion force of the battery cells is about 50kPa-300kPa (related to the specific model of the battery cells). The expansion of the battery cells must be properly constrained by the module or the box structure to ensure the normal operation of the battery cells. The patent does not solve the problem of the expansion of the power battery cells, which will reduce the cycle life of the battery cells and easily cause the risk of thermal runaway.

[0006] And in the process of use, the thermal management effect of the power battery is relatively poor. SUMMARY

[0007] The technical scheme of the present application aims at the technical problem that the prior art solution is too single, and provides a solution significantly different from the prior art. The present application provides a battery box and battery pack for a flying car to solve the problem that the existing power battery pack and its attached box for a flying car cannot meet the use requirements of high endurance, high safety and convenient maintenance of the power battery for a large-capacity flying car.

[0008] The present application adopts the following technical scheme: a battery box and battery pack for a flying car, comprising an upper box, further comprising a lower box used in cooperation with the upper box to protect the battery pack as a whole, an internal bearing assembly for protecting the battery pack inside the box, and a side wall protection mechanism for cooperating with the internal bearing assembly to provide enhanced protection for the battery pack.

[0009] Further, the internal bearing assembly comprises a bottom plate, an expansion beam and a longitudinal beam, the longitudinal beam is arranged between the two groups of battery packs, the expansion beam is respectively located at the front and rear ends of the battery pack, and the expansion beam is in a hollow structure.

[0010] Further, the front expansion beam is connected with the bottom plate, the front expansion beam is connected with the longitudinal beam, the rear expansion beam is connected with the bottom plate, and the rear expansion beam is connected with the longitudinal beam, the connection being welding, riveting, screwing or other modes such as composite connection.

[0011] The expansion beam assembly is provided with several heat management components for improving the heat management capability of the battery, and the expansion beam assembly is integrally formed or semi-integrally formed according to different use requirements, the inner wall of the expansion beam assembly is provided with several guide installation grooves, the guide installation grooves are divided into horizontal sliding grooves and vertical installation sliding grooves, the expansion beam assembly is in contact with the relatively large end face of the battery cell, and the opening of the expansion beam assembly faces the forward direction of the flying car, when the heat 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 and the frame are connected through plug-in connection, and the connection part is made of elastic sealing material, the heat management component comprises a guide plate and a support plate, the guide plate and the support plate are connected through a rotating shaft, the guide plate and the support plate are connected with the horizontal sliding grooves of the guide installation grooves through a plurality of rotating connecting blocks, and the guide plate and the support plate are rotatably connected with the rotating connecting blocks connected thereto, the rotating connecting blocks connected with the guide plate are provided with installation sliding blocks outside, the installation sliding blocks and the nickel-titanium alloy memory spring, the vertical installation sliding grooves in the guide installation grooves are provided with angle limiting blocks, the angle limiting blocks are provided with movement limiting grooves, the movement limiting grooves are provided with matching blocks for controlling the opening angle of the guide plate, and the angle limiting blocks are provided with limiting blocks for controlling the installation position of the support block.

[0012] The side wall of the expansion beam assembly and the frame are provided with a partition plate, the end of the partition plate is provided with an insertion block abutting against the angle limiting block, and the insertion block is conical.

[0013] Further, the power battery assembly comprises a power battery cell group, a low-voltage collection assembly, a high-voltage component assembly, a battery management system and a high-low voltage plug-in component, the power battery cell group is connected with the battery management system through the low-voltage collection assembly and the high-voltage component, the battery management system is connected with the vehicle body through the high-low voltage plug-in component, and the internal battery cells of the power battery cell group are distributed and placed in a non-fixed direction.

[0014] Compared with the prior art, the beneficial effects of the present application are as follows:

[0015] Under the condition that the functions of the battery pack in the application scenario of the flying car are normal, the weight of the battery box structure is greatly reduced, a large amount of light material and a hollow design are used to achieve further light weight, and the load capacity and endurance of the flying vehicle are improved.

[0016] In the flying car crash scenario, 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 poles of the battery cell and other high-voltage connection components are not easy to short circuit and catch fire, and the risk of thermal runaway is reduced.

[0017] The battery pack is an independent structure and is not integrated with the flying vehicle body structure, and is convenient to replace and maintain.

[0018] Since the battery power package is used for the flying car, when the flying car is flying, the gas flow is fast, the through expansion beam assembly is used, the gas passes through the expansion beam assembly, the gas flow can additionally take away the heat of the battery, thereby improving the heat dissipation effect, and in the process of use, the cooperation of the guide plate and the supporting plate makes the inner wall channel of the expansion beam assembly form a convex state, when the channel is provided with a convex state, the heat dissipation effect will be better, (the smooth surface is easy to form a laminar boundary layer, the low turbulence intensity, and the heat transfer efficiency is low. The convex structure can disturb the airflow, change the laminar flow into turbulent flow, enhance the mixing of fluid and solid surface, and improve the heat transfer efficiency. The higher the convexity, the stronger the disturbance effect. Therefore, the convex height in the expansion beam assembly can be changed according to the actual situation, and when the convex height can be changed, compared with the existing fixed convex, the existing fixed convex is easy to attach dust, and after a long time, the heat dissipation effect is affected. When the heat dissipation is not needed to be strengthened, the inner wall of the pipeline is relatively flat, so the dust is difficult to adhere;

[0019] And since the expansion coefficient of the battery changes with the service life, the existing beam can limit the battery, but since the battery cell will expand, if the shell cannot release the expansion of the battery cell, the shell will cause excessive extrusion force on the battery cell, thereby affecting the service life of the battery cell, therefore, the hollow and state-changeable expansion beam assembly in the application can avoid the stress between the battery cell and the expansion beam assembly caused by the expansion of the battery cell affecting the service life of the battery cell, and the expansion coefficient of the battery cell changes with the number of charging and discharging of the battery cell, and the upper limit of the temperature of the battery cell changes in the process of use, so that the upper limit of the convex angle of the expansion beam assembly is related to the upper limit of the temperature of the battery cell.

[0020] In summary, the application reconstructs the structure and sealing function of the battery box in the flying car power battery pack according to the use scene, and directly transmits the expansion force, gravity and motor overload force of the power battery cell group to the bearing skeleton, and then to the bearing of the aircraft mounting point to simplify the bearing structure, and realizes the sealing function by assembling the upper and lower boxes with light materials, reduces the redundant parts of the battery pack, and further lightens the connection between the lower box and the bearing skeleton.

[0021] In summary, by optimizing the structure of the battery box, the battery box is more suitable for the flying car, and the light weight is achieved, and the structure of the expansion beam of the bearing skeleton integrates the battery cell heat management function, and the service life of the battery pack is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the lower housing and power battery assembly structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the main exploded structure of the present invention;

[0026] Figure 4 This is a schematic diagram of the cell and expansion beam position distribution structure of the present invention;

[0027] Figure 5 For the present invention Figure 4 Schematic diagram of the cross-sectional structure at point AA;

[0028] Figure 6 This is a schematic diagram comparing the weight of the housing of the present invention with the weight of the housing of a battery cell of the same energy level;

[0029] Figure 7 This is a schematic diagram illustrating the constraint analysis of the cell expansion force in this invention;

[0030] Figure 8 This is a schematic diagram of the connection structure between the expansion beam assembly and the lower box body of the present invention;

[0031] Figure 9 This is a side sectional view of the expansion beam assembly of the present invention;

[0032] Figure 10 This is a schematic diagram of the internal structure of the expansion beam of the present invention;

[0033] Figure 11 This is a schematic diagram of the connection structure between the guide plate and the support plate of the present invention;

[0034] Figure 12 This is a schematic diagram of the main frame structure of the expansion beam assembly of the present invention;

[0035] Figure 13 This is a schematic diagram of the connection structure between the angle limiting block and the mating block of the present invention;

[0036] Figure 14 This is a schematic diagram of the connection structure between the expansion beam assembly and the thermal management assembly of the present invention.

[0037] Figure label:

[0038] 1, upper box; 2, power battery assembly; 21, power battery core group; 22, low-voltage acquisition assembly; 23, high-voltage assembly; 24, battery management system; 25, high-low voltage plug-in; 3, internal bearing assembly; 31, bottom plate; 32, longitudinal beam; 33, expansion beam assembly; 4, lower box; 5, thermal management assembly; 51, guide mounting groove; 52, partition plate; 53, rotating connecting block; 54, guide plate; 55, matching block; 56, support plate; 57, limiting block; 58, insertion block; 59, angle limiting block; 510, nickel-titanium alloy memory spring; 511, mounting sliding block. DETAILED DESCRIPTION

[0039] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments.

[0040] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application.

[0041] Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0042] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0043] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. EMBODIMENT

[0044] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments.Figures 1 to 7 As shown, the embodiment of the present application provides a battery box for flying car and a battery pack, which comprises an upper box 1, further comprises a lower box 4 used in cooperation with the upper box 1 for overall protection of the battery pack, and an internal bearing assembly 3 for protection of the battery pack inside the box.

[0045] During operation, the protection performance of the box needs to be considered, for this reason, the upper box 1 and the lower box 4 are made of metal material, and the inner wall is attached with an insulating coating, such as an epoxy resin insulating layer, etc., which can ensure that the aircraft crashes or the battery pack is impacted under the working condition, and the thermal runaway danger caused by short circuit of the battery cell or high-voltage assembly.

[0046] Or the upper box 1 and the lower box 4 are made of fiber resin composite material, such as glass fiber + resin (for example, RTM or PCM forming), carbon fiber reinforced plastic, etc., which is known to those skilled in the engineering field. The box made of fiber resin composite material is also insulated by itself, which can ensure that the aircraft crashes or the battery pack is impacted under the working condition, and the thermal runaway danger caused by short circuit of the battery cell or high-voltage assembly.

[0047] Or the upper box 1 and the lower box 4 are made of 1.1mm thick glass fiber + resin prepreg molding process (i.e. PCM forming). It has high degree of lightweight, high stiffness, simple forming and relatively low cost. Moreover, the material is inherently insulating, which can ensure that the flying car crashes or the battery pack is impacted under the working condition, and the thermal runaway danger caused by short circuit of the battery cell or high-voltage assembly.

[0048] Specifically, the internal bearing assembly 3 comprises 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 assembly 33 is arranged at the front and rear ends of the battery pack respectively, and the expansion beam assembly 33 is in a hollow structure. Since the expansion beam assembly 33 is arranged at the front and rear ends, i.e. at the larger end surface of the battery cell, it is indicated that the expansion beam assembly 33 has at least two.

[0049] The flying car belongs to the application scenario of medium maneuvering overload and large weight battery pack, the bottom plate 31, the front and rear expansion beam assemblies 33 and the battery pack fixing bracket are all made of 6061 aluminum alloy extrusion forming, and the longitudinal beam 32 is made of 2mm 5083 aluminum alloy stamping forming, which meets the requirements of lightweight, high bearing, high stiffness and low cost.

[0050] Specifically, the front expansion beam assembly 33 is connected with the bottom plate 31, the front expansion beam assembly 33 is connected with the longitudinal beam 32, the rear expansion beam assembly 33 is connected with the bottom plate 31, and the rear expansion beam assembly 33 is connected with the longitudinal beam 32, which is connected by welding, riveting, screwing or other ways, at this time, the inner partition plate 52 of the expansion beam assembly 33 is distributed at an oblique angle.

[0051] The bearing framework is the main bearing part of the battery pack, bearing the pre-tightening pressure of the battery cell, the expansion force of the battery cell during work, the weight of the battery cell and the motor overload, the weight of other components of the battery pack and the motor overload, and directly connecting the mounting point of the battery pack and the flying car.

[0052] The bearing framework is mainly composed of a bottom plate 31, a longitudinal beam 32, a front expansion beam, a rear expansion beam, and a battery pack fixing bracket.

[0053] Part or all of the 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 bearing and high rigidity.

[0054] During work, several battery pack fixing brackets are integrally formed or welded with the front expansion beam assembly 33 and the rear expansion beam assembly 33.

[0055] The front expansion beam assembly 33 and the rear expansion beam assembly 33 are in contact with the large surface of the battery cell, bearing the pre-tightening pressure of the battery cell and the expansion force of the battery cell during work.

[0056] 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 cell and the expansion force of the battery cell during work.

[0057] The bottom plate 31 is located below the power battery cell group 21, bearing the weight of the battery cell and the motor overload.

[0058] The lower box body 4 and the bottom plate 31 overlap region is partially hollowed out. As shown in Figure 5 The square area is the hollowed-out area of the lower box body 4, and the back-shaped frame area is the bonding and sealing area of the lower box body 4 and the bottom plate 31, to realize further lightweight and facilitate heat dissipation of the battery cell.

[0059] The expansion of the power battery cell group 21 during work is constrained by the connection of the front expansion beam assembly 33, the rear expansion beam assembly 33 and the longitudinal beam 32 of the bearing framework.

[0060] The weight and motor overload of the battery pack are transmitted to the battery pack fixing bracket by each component of the bearing framework, and then to the aircraft.

[0061] The low-voltage acquisition assembly 22 is mainly responsible for collecting voltage, temperature and other information in 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 part of the battery pack and belongs to the known technology of engineering and technical personnel in the field.

[0062] The high-voltage assembly 23 forms a high-voltage loop by connecting the battery cells and other high-voltage devices in the battery pack in series and parallel to realize the high-voltage function of the battery pack. It is part of the battery pack and belongs to the known technology of engineering and technical personnel in the field.

[0063] The battery management system 24 implements the battery pack battery management function and input and output energy function, is part of the battery pack, and belongs to the technology known to the engineering technicians in the art.

[0064] The high and low voltage plug-in 25 implements the battery pack input and output energy, transmits control signals, and transmits collection signals, is part of the battery pack, and belongs to the working principle of the technology known to the engineering technicians in the art. Embodiment

[0065] The following will be described in conjunction with Figures 8 to 13 as shown;

[0066] The expansion beam assembly 33 is provided with a plurality of thermal management assemblies 5 for improving the thermal management capability of the battery. The expansion beam assembly 33 is divided into integral molding and semi-integral molding according to different use requirements. A plurality of guide installation grooves 51 are formed in the inner wall of the expansion beam assembly 33. The guide installation grooves 51 are divided into horizontal sliding grooves and vertical installation sliding grooves. The expansion beam assembly 33 is in contact with the relatively large end face of the battery cell, and the opening of the expansion beam assembly 33 faces the forward direction of the flying car. When the thermal management assembly 5 needs to be installed, the expansion beam assembly 33 is semi-integrally molded at this time. The side wall of the expansion beam assembly 33 in contact with the battery cell is connected to the frame by plug-in connection, and the connection is made of elastic sealing material. The thermal management assembly 5 includes a guide plate 54 and a support plate 56. The guide plate 54 and the support plate 56 are connected by a rotating shaft. The guide plate 54 and the support plate 56 are connected to the rotating connecting blocks 53 by a plurality of rotating connecting blocks 53 between the horizontal sliding grooves of the guide installation grooves 51. The rotating connecting blocks 53 connected to the guide plate 54 are provided with installation sliding blocks 511 on the outer side. The installation sliding blocks 511 and the nickel-titanium alloy memory springs 510 are installed in the vertical installation sliding grooves in the guide installation grooves 51. An angle limiting block 59 is installed in the vertical installation sliding grooves. A moving limiting groove is formed in the angle limiting block 59. A matching block 55 for controlling the opening angle of the guide plate 54 is arranged in the moving limiting groove. A limiting block 57 for controlling the installation position of the support block is arranged on the angle limiting block 59. The limiting block 57 and the moving limiting groove can be locked by a fastening bolt.

[0067] In summary, the expansion beam assembly 33 in embodiment 1 is integrally molded, and is suitable for a flying car with relatively small load and low heat generation. The expansion beam assembly 33 in embodiment 2 is manufactured in a split type, and is suitable for a flying car with large load, high heat generation and large deformation.

[0068] The nickel-titanium alloy memory spring 510 described in the above is made of industrial memory alloy, and the nickel-titanium alloy memory spring 510 has the mechanical properties of a traditional spring and the unique function of a shape memory alloy.

[0069] The partition plate 52 is arranged between the side wall of the expansion beam assembly 33 and the frame, and the end of the partition plate 52 is provided with an insertion block 58 abutting against the angle limiting block 59, and the insertion block 58 is tapered. At the same time, since the angle limiting block 59 moves up and down, the limiting effect of the limiting block 57 needs to be ensured, and for this purpose, the connection between the angle limiting block 59 and the limiting block 57 is slidingly connected by a T-shaped sliding groove, so that the movement of the angle limiting block 59 does not drive the limiting block 57 to move synchronously, but can longitudinally limit and engage the limiting block 57, or the angle limiting block 59 and the limiting block 57 are fixedly connected, and at this time, the height of the limiting block needs to be controlled, so that when the limiting block 57 slides with the angle limiting block 59, it still contacts the rotating connecting block 53.

[0070] In use, the end surface of the expansion beam assembly 33 and the battery cell is adjusted adaptively with the motor overload and the upper limit of the load, and in the process of requiring strong thermal management effect, the expansion beam assembly 33 is made of semi-integral molding, the main frame of the expansion beam assembly 33 is integrally formed into a U-shaped frame with a guide installation groove 51, and the side wall in contact with the large end surface of the battery cell is connected by splicing between the main frame and the side wall. The splicing between the main frame and the side wall is spliced by clamping, and the abutting portion is made of elastic sealing material. Since the elastic sealing material is used (at this time, the elastic sealing material has two functions: one is to ensure the sealing property to prevent water from entering the box, and the other is that when the side wall is abutted by the expansion of the end surface of the battery cell, the side wall will extrude the elastic sealing material, so that the side wall has a certain displacement ability, thereby avoiding the hard connection between the side wall and the main frame. When the battery cell expands greatly, the stress between the battery cell and the side wall is too large, thereby affecting the service life of the battery cell);

[0071] At the same time, if the heat distribution of the battery cell assembly is uneven (since the expansion beam assembly 33 for gas circulation is arranged on both sides of the battery cell, the heat dissipation effect of the two ends is relatively stronger, so that the middle is hot and the two sides are cold), a through channel can be formed in the bottom of the lower shell, and a group of expansion beam assemblies 33 are additionally arranged at the middle position of the power battery assembly 21. The expansion beam assembly 33 at the middle position is connected between the through channel at the bottom, and when the gas passes through the through channel at the bottom, the gas circulation can carry away part of the heat, thereby reducing the phenomenon of uneven heat distribution.

[0072] When the sidewall expansion beam assembly 33 is in use, the heat management assembly 5 arranged therein can intervene at this time. When the operation is relatively stable, the battery cell gradually releases heat as the energy of the battery cell is continuously output. Due to the low flight speed, the gas flow rate in the channel of the expansion beam assembly 33 is relatively slow, causing the temperature in the expansion beam assembly 33 to gradually rise. The nickel-titanium alloy memory spring 510 is affected by the temperature and resets, thereby pushing the guide plate 54 to move inward. Since the guide plate 54 and the support plate 56 are rotationally connected, the end point position of the support plate 56 is limited by the limiting block 57. When the guide plate 54 is pushed, the support plate 56 cannot move, so the guide plate 54 folds along the rotationally connected portion, thereby forming a convex state of the guide plate 54 and the support plate 56. When the convex state is formed, the heat dissipation effect can be improved when the gas flows. The higher the temperature, the more obvious the inclination 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 decreases, the nickel-titanium alloy memory spring 510 resets, thereby resetting the guide plate 54 and the support plate 56. At this time, the convexity angle is small, and the surface is relatively flat, thereby avoiding excessive and constant convexity that causes dust accumulation and affects heat dissipation.

[0073] When the battery cell expands, the sidewall is squeezed, the elastic sealing material connected to the sidewall is squeezed, and the sidewall has a displacement state. When the sidewall is displaced, the partition plate 52 connected thereto is synchronously moved. The partition plate 52 moves to move the insertion block 58 connected thereto. The movement of the insertion block 58 moves the angular limiting block 59 connected thereto upward. At this time, the gap between the angular limiting block 59 and the matching block 55 increases. When the guide plate 54 is inclined, the matching block 55 is also inclined. The inclination angle of the guide plate 54 can be controlled by controlling the gap between the angular limiting block 59 and the matching block 55. Therefore, the inclination angle of the guide plate 54 can be controlled by the expansion of the battery cell, thereby changing the gap between the angular limiting block 59 and the matching block 55.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions described in the foregoing embodiments can be modified, or some or all of the technical features can be replaced by equivalents. The modification or replacement does not change the essence of the corresponding technical solution beyond the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery case for an air mobile, comprising an upper case (1), characterized in that; Also include and the upper box (1) is used for the whole protection of the battery pack lower box (4), for the internal battery pack protection of the internal bearing assembly (3); The internal bearing assembly (3) comprises 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, and the expansion beam assembly (33) is respectively located at the front and rear ends of the battery pack, and the expansion beam assembly (33) is in a hollow structure. The expansion beam assembly (33) is provided with a plurality of heat management assemblies (5) for improving the battery thermal management capability, the expansion beam assembly (33) is semi-integrally formed, a plurality of guide installation grooves (51) are formed in the inner wall of the expansion beam assembly (33), the guide installation grooves (51) are divided into horizontal sliding grooves and vertical installation sliding grooves, the expansion beam assembly (33) is in contact with the relatively large end face of the battery cell, and the opening direction of the expansion beam assembly (33) is the forward direction of the flying car, the side wall of the expansion beam assembly (33) in contact with the battery cell is connected with the frame by plug-in connection, and the connection is made of elastic sealing material, the heat management assembly (5) comprises a guide plate (54) and a support plate (56), the guide plate (54) and the support plate (56) are connected through a rotating shaft, a plurality of rotating connecting blocks (53) are connected between the guide plate (54), the support plate (56) and the horizontal sliding grooves of the guide installation groove (51), the guide plate (54) and the support plate (56) are rotatably connected with the rotating connecting blocks (53) connected thereto, the rotating connecting blocks (53) connected with the guide plate (54) are provided with installation sliding blocks (511) outside, a nickel-titanium alloy memory spring (510) is arranged between the installation sliding block (511) and the rotating connecting block (53), an angle limiting block (59) is arranged in the vertical installation sliding groove in the guide 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 guide plate (54) is arranged in the moving limiting groove, a limiting block (57) for controlling the installation position of the support plate (56) is arranged on the angle limiting block (59); The expansion beam assembly (33) is provided with a partition plate (52) between the side wall and the frame, the partition plate (52) is provided with an insertion block (58) abutting against the angle limiting block (59), and the insertion block (58) is in a tapered shape.

2. The battery case for an air mobile according to claim 1, wherein The upper box (1) and the lower box (4) constitute a shell sealing structure of the battery pack.

3. The battery case for an air mobile according to claim 1, wherein The expansion beam assembly (33) is connected with the bottom plate (31), the expansion beam assembly (33) is connected with the longitudinal beam (32), the expansion beam assembly (33) is connected with the bottom plate (31), the expansion beam assembly (33) is connected with the longitudinal beam (32), and the connection is welding, riveting, screwing or other modes such as composite connection.

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