Loudspeaker module, vehicle body structure and electric vehicle

Abstract

The utility model provides a loudspeaker module, a vehicle body structure and an electric vehicle, the loudspeaker module comprises a shell, the shell comprises an inner shell and an outer shell, a sound outlet is formed in the inner shell, and the outer shell is arranged on the outer side of the inner shell and avoids the sound outlet; the sound production single body is connected to the inner shell and can produce sound outwards through the sound outlet; a cavity is formed between at least one side of the outer shell and the inner shell, and the cavity is used for weakening part of sound production of the sound production single body, reducing noise generated by the loudspeaker module in the area outside the sound outlet, and guaranteeing quietness of a vehicle.

Description

Technical Field

[0001] The utility model belongs to the technical field of acoustics, and specifically relates to a speaker module, a vehicle body structure and an electric vehicle. Background Art

[0002] With the popularity of electric vehicles, in order to ensure the safety of pedestrians, the Acoustic Vehicle Alerting System (AVAS) speaker has become a standard feature of electric vehicles. However, the current AVAS speaker is installed between the guard plate and the radiator at the front of the vehicle body and emits sound toward the front of the vehicle.

[0003] However, due to the obstruction of the guard plate and radiator at the installation position, the AVAS speaker has a single sound directionality and cannot provide sound alarms in multiple directions of the vehicle. Moreover, the sound of the AVAS speaker is easily transmitted into the vehicle, affecting the quietness of the vehicle. Utility Model Content

[0004] One object of the utility model is to provide a new technical solution for a speaker module, a vehicle body structure and an electric vehicle.

[0005] According to a first aspect of the present invention, a speaker module is provided for simulating the engine sound of a vehicle, comprising:

[0006] A shell, the shell comprising an inner shell and an outer shell, the inner shell is formed with a sound outlet, and the outer shell is arranged outside the inner shell and avoids the sound outlet;

[0007] A sound-emitting unit, the sound-emitting unit being connected to the inner shell and capable of emitting sound outward through the sound outlet;

[0008] A cavity is formed between at least one side of the outer shell and the inner shell, and the cavity is used to reduce the sound of the sound-emitting unit in an area outside the sound outlet.

[0009] Optionally, the sound outlet is provided with a sound guide structure, and the sound guide structure is used to conduct the engine sound toward the traveling direction of the vehicle.

[0010] Optionally, the sound outlet is located on the first side of the housing;

[0011] The first side of the shell is used to be connected to the vehicle body structure, and the sound emission direction of the sound-emitting unit is along the direction from the roof to the bottom of the vehicle.

[0012] Optionally, the inner shell includes a first annular side wall, and the outer shell includes a second annular side wall, wherein the second annular side wall is arranged on the outside of the first annular side wall and has a first cavity between the second annular side wall and the first cavity forms at least part of the cavity.

[0013] Optionally, the inner shell includes a first rear cover, one end of the first annular side wall has the sound outlet, and the first rear cover is connected to the other end of the first annular side wall.

[0014] Optionally, the outer shell includes a second back cover, one end of the second annular side wall is connected to one end of the first annular side wall, the second back cover is connected to the other end of the second annular side wall and a second cavity is formed between the second back cover and the first back cover;

[0015] The first cavity is communicated with the second cavity to form the cavity.

[0016] Optionally, the cavity is a vacuum cavity.

[0017] Optionally, a sound insulation member is further included, and the sound insulation member is arranged in the cavity.

[0018] Optionally, the sound insulation member includes a sound insulation board or sound insulation cotton.

[0019] Optionally, the sound unit includes a basin frame and a magnetic circuit assembly, the basin frame is integrally formed with the shell, and the magnetic circuit assembly is connected to the basin frame.

[0020] According to a second aspect of the present invention, a vehicle body structure is provided, comprising the speaker module described in the first aspect.

[0021] Optionally, a bottom guard plate is further included, wherein the inner side of the bottom guard plate has a mounting area, and the first side of the housing is connected to the mounting area;

[0022] The installation area has a plurality of sound-transmitting holes.

[0023] Optionally, a gasket is also included, which is clamped between the shell and the bottom guard plate.

[0024] According to a third aspect of the present utility model, there is provided an electric vehicle, comprising the vehicle body structure according to the second aspect; or,

[0025] Includes the speaker module described in the first aspect.

[0026] A technical effect of the utility model is:

[0027] An embodiment of the present application provides a speaker module, which includes a shell, the shell includes an inner shell and an outer shell, a sound outlet is formed on the inner shell, and the outer shell is arranged on the outside of the inner shell and avoids the sound outlet; a sound-emitting unit, which is connected to the inner shell and can emit sound outward through the sound outlet; a cavity is formed between at least one side of the outer shell and the inner shell, and the cavity is used to weaken part of the sound of the sound-emitting unit, reduce the noise generated by the speaker module in the area outside the sound outlet, and ensure the quietness of the vehicle.

[0028] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0030] Figure 1 A cross-sectional view of a speaker module provided in accordance with an embodiment of the present invention.

[0031] Wherein: 1. Shell; 11. Sound outlet; 12. Inner shell; 121. First annular side wall; 122. First back cover; 13. Outer shell; 131. Second annular side wall; 132. Second back cover; 14. Cavity; 2. Sounding unit; 21. Basin; 22. Magnetic circuit assembly; 3. Dust screen;

[0032] 100, bottom guard plate; 101, sound hole; 200, gasket. DETAILED DESCRIPTION

[0033] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0034] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be understood as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0035] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this application, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0036] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0037] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0039] The speaker module provided in the embodiment of the present application can be a speaker of the Acoustic Vehicle Alerting System (AVAS), which is used to simulate the engine sound of the vehicle to alert pedestrians and vehicles. Moreover, the sound-emitting unit in the speaker module can emit sound downward, which not only avoids the obstruction of the sound by components such as the guard plate and radiator inside the vehicle, but also enables the sound of the sound-emitting unit in the speaker module to be directed to the surroundings of the vehicle after hitting the ground or being guided by the sound guide structure, thereby improving the multi-directionality of the sound of the speaker module, so that the vehicle can generate sound alarms in multiple directions; and after the speaker module emits sound downward, it can reduce the noise transmitted to the vehicle, ensuring the quietness of the vehicle.

[0040] Reference Figure 1The present application provides a speaker module for being arranged on a vehicle and emitting sound outside the vehicle. For example, the speaker module can be used to simulate the engine sound of the vehicle. The speaker module includes:

[0041] The housing 1 comprises an inner housing 12 and an outer housing 13. The inner housing 12 is formed with a sound outlet 11. The outer housing 13 is arranged outside the inner housing 12 and avoids the sound outlet 11.

[0042] A sound-emitting unit 2, wherein the sound-emitting unit 2 is connected to the inner shell 12 and can emit sound outward through the sound outlet 11;

[0043] A cavity 14 is formed between at least one side of the outer shell 13 and the inner shell 12, and the cavity 14 is used to weaken the sound of the sound unit 2 in the area outside the sound outlet 11, thereby reducing the noise generated by the speaker module in the area outside the sound outlet.

[0044] In this embodiment, the shell 1 serves as a mounting and protection structure for the speaker module, and can facilitate the placement of structures such as the sound-emitting unit in the shell 1 and form protection through the shell 1.

[0045] The sound unit 2 can serve as the sound unit of the speaker module. The sound unit 2 includes a magnetic circuit assembly and a vibration assembly. The voice coil in the vibration assembly extends into the magnetic gap of the magnetic circuit assembly and can vibrate relative to the magnetic circuit assembly when the voice coil is energized. Then the voice coil drives the diaphragm to vibrate to realize the sound of the speaker module. The sound of the sound unit 2 can be transmitted to the outside of the speaker module through the sound outlet 11. The sound of the sound unit 2 can simulate the engine sound of a vehicle to achieve the effect that the speaker module can emit the engine sound.

[0046] In one embodiment, the area outside the sound outlet includes the vehicle's passenger compartment. The sound outlet 11 can be set at the bottom of the shell 1. The direction of the sound-emitting unit 2 toward the vehicle's passenger compartment can pass through the side or top of the shell 1, through the inner shell 12 and the outer shell 13 extending to the side and top of the shell 1, and a cavity 14 is formed between the inner shell 12 and the outer shell 13. The cavity 14 can reduce the energy transfer of sound waves in the area outside the sound outlet 11, thereby weakening the sound of the sound-emitting unit 2 toward the vehicle's passenger compartment and reducing noise pollution in the vehicle's passenger compartment.

[0047] The outer shell 13 avoids the sound outlet 11, which means that the cavity 14 avoids the sound outlet 11, so that the sound-emitting unit 2 can directly emit sound through the sound outlet 11, ensuring the reminder effect of the speaker module emitting the engine sound.

[0048] The speaker module provided in the embodiment of the present application includes a shell 1, which includes an inner shell 12 and an outer shell 13, wherein a sound outlet 11 is formed on the inner shell 12, and the outer shell 13 is arranged on the outer side of the inner shell 12 and avoids the sound outlet 11; a sound unit 2, wherein the sound unit 2 is connected to the inner shell 12 and can emit sound outward through the sound outlet 11; a cavity 14 is formed between at least one side of the outer shell 13 and the inner shell 12, and the cavity 14 is used to weaken the sound of the sound unit 2 in the area outside the sound outlet 11, reduce the noise generated by the speaker module in the area outside the sound outlet, and ensure the quietness of the vehicle.

[0049] In one embodiment, the sound outlet 11 is provided with a sound guide structure for conducting the engine sound toward the direction of travel of the vehicle to increase the engine sound intensity of the vehicle in the direction of travel and ensure that the speaker module achieves a reminder effect by emitting the engine sound.

[0050] In one embodiment, the sound guide structure includes a first sound guide channel facing the front of the vehicle and a second sound guide channel facing the rear of the vehicle, one end of the first sound guide channel is connected to the sound outlet 11, and the other end of the first sound guide channel faces the front of the vehicle, one end of the second sound guide channel is connected to the sound outlet 11, and the other end of the second sound guide channel faces the rear of the vehicle.

[0051] In this embodiment, when the vehicle moves forward, the sound of the sound unit 2 can be transmitted to the first sound guide channel through the sound outlet 11, and the engine sound is emitted toward the front of the vehicle through the first sound guide channel; when the vehicle moves backward, the sound of the sound unit 2 can be transmitted to the second sound guide channel through the sound outlet 11, and the engine sound is emitted toward the rear of the vehicle through the second sound guide channel.

[0052] In one embodiment, the sound guide structure includes a rotatable sound guide channel, and the sound guide channel can switch between a direction toward the front of the vehicle and a direction toward the rear of the vehicle; when the vehicle moves forward, the sound guide channel rotates to a position toward the front of the vehicle, and the sound of the sound unit 2 can be transmitted to the sound guide channel through the sound outlet 11, and the engine sound is emitted toward the front of the vehicle through the sound guide channel; when the vehicle moves backward, the sound guide channel rotates to a position toward the rear of the vehicle, and the sound of the sound unit 2 can be transmitted to the sound guide channel through the sound outlet 11, and the engine sound is emitted toward the rear of the vehicle through the sound guide channel.

[0053] In one embodiment, see Figure 1 , the sound outlet 11 is located at the first side of the housing 1;

[0054] The first side of the housing 1 is used to be connected to a vehicle body structure, and the sound emission direction of the sound-emitting unit 2 is along the direction from the roof to the bottom of the vehicle.

[0055] In this embodiment, if Figure 1 As shown, the first side of the shell 1 can be the lower side of the shell 1, that is, the sound outlet 11 is located on the lower side of the shell 1, and the lower side of the shell 1 is connected to the vehicle body structure. The sound unit 2 can emit sound downward through the sound outlet 11 at the bottom of the shell 1, so that the sound direction of the sound unit 2 is along the direction from the roof to the bottom of the vehicle and towards the ground. The sound of the sound unit 2 will diverge around the vehicle after being reflected by the ground, so that the vehicle can generate an engine sound alarm in multiple directions, which increases the warning range of the vehicle engine sound, and the sound unit 2 emitting sound downward can weaken the sound transmitted to the interior of the vehicle, thereby ensuring the quietness of the vehicle.

[0056] In this embodiment, the sound of the speaker module is directed from the roof to the bottom of the vehicle and toward the ground, thereby avoiding obstruction of the sound by internal components of the vehicle. The power of the speaker module can be reduced while ensuring the sound intensity of the speaker module, thereby reducing the energy consumption of the speaker module.

[0057] In this embodiment, the downward installation of the speaker module can avoid the use of a bracket to connect and fix the speaker module. For example, the speaker module can be directly fixed on the bottom guard plate. By utilizing the space above the bottom guard plate, the internal space of the speaker module can be made larger, which is beneficial to the low-frequency sound of the speaker module.

[0058] In one embodiment, see Figure 1 The inner shell 12 includes a first annular side wall 121, and the outer shell 13 includes a second annular side wall 131. The second annular side wall 131 is arranged on the outer side of the first annular side wall 121 and has a first cavity between the second annular side wall 131 and the first cavity forms at least part of the cavity 14.

[0059] The area outside the sound outlet 11 may be an area on the shell 1 where no sound outlet is set. For example, the shell 1 includes a bottom surface, a side surface and a top surface. The sound outlet 11 is set in at least a part of the bottom surface of the shell 1. The side surface and / or the top surface of the shell 1 can be provided with a cavity 14, or even a part of the cavity 14 can be set in the area of ​​the bottom surface of the shell 1 where no sound outlet 11 is set, so as to weaken the sound transmission of the sound-emitting unit 2 on the side and top surfaces, thereby reducing the noise generated by the speaker module on the side and top surfaces.

[0060] In this embodiment, on the side of the shell 1 adjacent to the side where the sound outlet 11 is set, there is a first cavity between the second annular side wall 131 and the first annular side wall 121. The first cavity can weaken the sound transmission of the sound unit 2 on the side of the shell 1 and reduce the noise generated by the speaker module on the side.

[0061] In one embodiment, see Figure 1The inner shell 12 includes a first rear cover 122 , one end of the first annular side wall 121 has a sound outlet 11 , and the first rear cover 122 is connected to the other end of the first annular side wall 121 .

[0062] In this embodiment, the bottom of the first annular side wall 121 may have a sound outlet 11, and the top of the first annular side wall 121 may form a first mounting port, through which the sound unit 2 is connected to the inner shell 12 and can emit sound downward through the sound outlet 11; after the sound unit 2 is connected to the inner shell 12, the first back cover 122 may be connected to the first mounting port and the first mounting port may be closed to ensure the sound effect of the speaker module while facilitating the assembly of the speaker module.

[0063] In one embodiment, see Figure 1 The sound outlet 11 is provided with a dustproof net 3, and the dustproof net 3 and the shell 1 cooperate with each other to surround the sound unit 2, thereby preventing external impurities from entering the interior of the speaker module through the sound outlet 11, and ensuring the cleanliness of the internal space of the speaker module.

[0064] In one embodiment, see Figure 1 The outer shell 13 includes a second back cover 132, one end of the second annular side wall 131 is connected to one end of the first annular side wall 121, and the second back cover 132 is connected to the other end of the second annular side wall 131 and has a second cavity between the first back cover 122;

[0065] The first cavity is communicated with the second cavity to form a cavity 14 .

[0066] In this embodiment, the bottom of the second annular side wall 131 can be connected to the bottom of the first annular side wall 121, and the top of the second annular side wall 131 can form a second mounting port, a first cavity is formed between the first annular side wall 121 and the second annular side wall 131, and the second back cover 132 is connected to the second mounting port and forms a second cavity between the first back cover 122. After the first cavity and the second cavity are connected, a closed cavity 14 is formed to weaken the sound transmission of the sound unit 2 through the area outside the sound outlet 11 through the cavity 14, so as to reduce the noise generated by the speaker module while ensuring the sound effect of the speaker module.

[0067] In one embodiment, the chamber 14 is a vacuum chamber.

[0068] In this embodiment, the shell 1 surrounds the sound unit 2, and except for the position where the sound outlet 11 is set on the shell 1, other positions on the shell 1 can form a cavity 14 through the interlayer between the inner shell 12 and the outer shell 13. The cavity 14 can attenuate the sound emitted by the sound unit 2 and reduce the noise transmitted from the sound unit 2 to the interior of the vehicle, while retaining the engine warning sound transmitted from the sound unit 2 to the outside of the vehicle through the sound outlet 11, thereby improving the riding comfort of the passenger compartment in the vehicle.

[0069] Specifically, the interlayer between the inner shell 12 and the outer shell 13 can be evacuated to obtain a vacuum cavity 14, which can effectively hinder the energy transfer of sound waves; when the air pressure changes due to the vibration of the diaphragm of the sound-emitting unit 2 in the shell 1, the inner shell 12 will vibrate due to the change in air pressure, or the inner shell 12 will emit medium and high frequency noise, but due to the barrier of the vacuum cavity between the inner shell 12 and the outer shell 13, the vibration or noise of the inner shell 12 will not be transmitted to the outer shell 13, and the sound emitted by the sound-emitting unit 2 inside the shell 1 will also be blocked by the vacuum cavity, thereby reducing the noise transmitted from the sound-emitting unit 2 to the vehicle.

[0070] In one embodiment, the vacuum degree of the cavity 14 is less than -10 Kpa, for example, the vacuum degree of the cavity 14 is set to -100 Kpa, -50 Kpa or -30 Kpa, so as to ensure the effect of the vacuum cavity in isolating vibration and noise.

[0071] In one embodiment, a sound insulating member is further included and is disposed in the cavity 14 .

[0072] In this embodiment, when the sound emitted by the sound-emitting unit 2 is transmitted to the passenger compartment through the cavity 14, the sound waves will be buffered and absorbed by the porous structure in the sound insulation component when encountering the sound insulation component, thereby utilizing the sound insulation component to achieve a sound insulation effect and reduce the noise in the passenger compartment.

[0073] In one embodiment, the cavity 14 is a vacuum cavity, and a sound insulation piece is disposed in the vacuum cavity, so that the sound insulation effect of the housing 1 is further increased through the cooperation of the vacuum cavity and the sound insulation piece.

[0074] In one embodiment, the sound insulation element includes a sound insulation board or sound insulation cotton.

[0075] In this embodiment, the concave-convex structure or porous surface on the sound insulation board can scatter the noise at different angles, dispersing the energy of the noise, thereby reducing the intensity of sound transmission; the sound insulation cotton is provided with sound-absorbing structures such as porous fibers inside, which can absorb the energy of the noise and convert it into heat energy or other forms of energy, thereby reducing the transmission of noise.

[0076] In one embodiment, see Figure 1The sound unit 2 includes a basin frame 21 and a magnetic circuit component 22 . The basin frame 21 is integrally formed with the shell 1 , and the magnetic circuit component 22 is connected to the basin frame 21 .

[0077] In this embodiment, the shell 1 and the basin frame 21 are designed as an integrated whole, which can ensure the stability of the basin frame 21. A mounting position is provided on the basin frame 21, and the mounting position is opposite to the sound outlet 11. The magnetic circuit assembly 22 can be directly bonded to the mounting position of the basin frame 21 to ensure that the magnetic circuit assembly 22 is directly opposite to the sound outlet 11, thereby ensuring the sound effect of the speaker module.

[0078] In one embodiment, a vehicle equipped with the speaker module is subjected to a simulated engine sound test in an anechoic chamber, and the engine sound test points include a first test point, a second test point, and a third test point. The test points are provided with microphones and the measurement is performed for 10 seconds. The first test point is located in the passenger compartment of the vehicle. When the vehicle is moving forward at a speed of 5km / h-20km / h in pure electric mode, the second test point is selected at 2m on both sides of the front of the vehicle and 1.2m above the ground. When the vehicle is reversing in pure electric mode, the third test point is selected at 2m on both sides of the rear of the vehicle and 1.2m above the ground.

[0079] When the vehicle is moving forward or backward, the pink noise inside the vehicle at the first test point can be reduced to below 33dB, the wind noise inside the vehicle can be reduced to below 36dB, and the engine sound alarm sound at the second and third test points can reach 58dB, meeting national regulations.

[0080] An embodiment of the present application provides a vehicle body structure, which includes the above-mentioned speaker module.

[0081] In this embodiment, the sound unit 2 of the speaker module can emit sound along the direction from the roof to the bottom of the vehicle, so that the speaker module can emit sound downward, increasing the warning range of the vehicle engine sound, and the sound unit 2 emitting sound downward can weaken the sound transmitted to the interior of the vehicle, ensuring the quietness of the vehicle.

[0082] In one embodiment, see Figure 1 The vehicle body structure further includes a bottom guard plate 100, the inner side of the bottom guard plate 100 has a mounting area, and the first side of the housing 1 is connected to the mounting area;

[0083] The installation area has a plurality of sound-transmitting holes 101 .

[0084] In this embodiment, the bottom guard plate 100 is the bottom protective component of the vehicle body structure. The bottom guard plate 100 can be parallel to the ground, so that the sound unit 2 can emit sound downward and disperse to the surroundings of the vehicle after being reflected by the ground, so that the vehicle can generate engine sound alarms in multiple directions; and the sound-transmitting hole 101 on the installation area can be opposite to the sound outlet 11, ensuring the smoothness of the sound transmission of the sound unit 2.

[0085] In one embodiment, see Figure 1 The vehicle body structure further includes a gasket 200 , which is sandwiched between the shell 1 and the bottom guard plate 100 .

[0086] In this embodiment, the gasket 200 may have a certain elasticity. When the shell 1 is connected to the bottom guard plate 100 through a locking member, the gasket 200 may be clamped between the shell 1 and the bottom guard plate 100. The gap between the shell 1 and the bottom guard plate 100 is sealed by the compression deformation of the gasket 200. In addition, the gasket 200 in the compressed state can buffer the shaking of the shell 1 relative to the bottom guard plate 100, thereby ensuring the stability of the installation of the speaker module.

[0087] The embodiment of the present application provides an electric vehicle, the vehicle comprising the above-mentioned vehicle body structure; or,

[0088] Includes the above-mentioned speaker module.

[0089] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A speaker module, used to be installed on a vehicle and emit sound outside the vehicle, characterized in that: include: A shell (1), the shell (1) comprising an inner shell (12) and an outer shell (13), a sound outlet (11) being formed on the inner shell (12), and the outer shell (13) being arranged outside the inner shell (12) and avoiding the sound outlet (11); A sound-emitting unit (2), the sound-emitting unit (2) being connected to the inner shell (12) and capable of emitting sound outward through the sound outlet (11); A cavity (14) is formed between at least one side of the outer shell (13) and the inner shell (12), and the cavity (14) is used to reduce the sound of the sound-emitting unit (2) in an area outside the sound outlet (11).

2. The speaker module according to claim 1, characterized in that: The sound outlet (11) is provided with a sound guide structure, and the sound guide structure is used to conduct the engine sound toward the traveling direction of the vehicle.

3. The speaker module according to claim 1, characterized in that: The sound outlet (11) is located on a first side of the housing (1); The first side of the shell (1) is used to be connected to the vehicle body structure, and the sound emission direction of the sound-emitting unit (2) is along the direction from the roof to the bottom of the vehicle.

4. The speaker module according to claim 3, characterized in that: The inner shell (12) comprises a first annular side wall (121), and the outer shell (13) comprises a second annular side wall (131), wherein the second annular side wall (131) is arranged on the outer side of the first annular side wall (121) and has a first cavity between the second annular side wall (131) and the first cavity forms at least a part of the cavity (14).

5. The speaker module according to claim 4, characterized in that: The inner shell (12) comprises a first rear cover (122), one end of the first annular side wall (121) is provided with the sound outlet (11), and the first rear cover (122) is connected to the other end of the first annular side wall (121).

6. The speaker module according to claim 5, characterized in that: The outer shell (13) comprises a second rear cover (132), one end of the second annular side wall (131) is connected to one end of the first annular side wall (121), the second rear cover (132) is connected to the other end of the second annular side wall (131) and a second cavity is formed between the second rear cover (132) and the first rear cover (122); The first cavity is communicated with the second cavity to form the cavity (14).

7. The speaker module according to claim 1, characterized in that: The cavity (14) is a vacuum cavity.

8. The speaker module according to claim 1, characterized in that: It also includes a sound insulation piece, which is arranged in the cavity (14).

9. The speaker module according to claim 8, characterized in that: The sound insulation member includes a sound insulation board or sound insulation cotton.

10. The speaker module according to claim 1, characterized in that: The sound-generating unit (2) comprises a basin frame (21) and a magnetic circuit component (22); the basin frame (21) is integrally formed with the housing (1); and the magnetic circuit component (22) is connected to the basin frame (21).

11. A vehicle body structure, characterized in that: A speaker module comprising any one of claims 1-10.

12. The vehicle body structure according to claim 11, characterized in that: It also includes a bottom guard plate (100), the inner side of the bottom guard plate (100) has a mounting area, and the first side of the shell (1) is connected to the mounting area; The installation area has a plurality of sound-transmitting holes (101).

13. The vehicle body structure according to claim 12, characterized in that: It also includes a gasket (200), wherein the gasket (200) is sandwiched between the shell (1) and the bottom guard plate (100).

14. An electric vehicle, characterized in that: A vehicle body structure comprising any one of claims 11 to 13; or A speaker module comprising any one of claims 1-10.

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