Motor vehicle and method for monitoring

Abstract

The present invention relates to a motor vehicle (1), in particular a motor vehicle (1) that is at least partially electrically driven, which has a battery device (5) with at least one battery cell (7), wherein the battery device (5) is arranged in the floor area (8) of the motor vehicle (1); the motor vehicle also has a protection device (9) for protecting the battery device (5) from mechanical influences, wherein the protection device (9) has a protection plate (10), and the protection plate is arranged such that it at least partially covers the battery device (5), so that possible mechanical influences are absorbed by the protection plate (10), and an acoustic monitoring device (11) is provided, which acoustically monitors the protection plate (10) and is capable of outputting a signal when a typical noise indicating mechanical damage to the protection plate (10) is detected. A method for monitoring the protection device (9) is also the subject of the present invention.

Description

Technical Field

[0001] The present invention relates to a motor vehicle having a protection device and a method for monitoring the protection device, in particular a motor vehicle having a battery device and a protection device for protecting the battery device, and a method for monitoring the protection device of the battery device. Background Art

[0002] A motor vehicle with an electric motor as the drive motor, i.e., an electric vehicle or a hybrid vehicle (i.e., a motor vehicle with an electric drive or a partial electric drive), has an electric motor and a battery device. Electrical energy is stored in the battery device, which can be charged, for example, by an electrical connection to a charging network and / or by re-storing kinetic energy, for example, during braking or downhill driving. The stored electrical energy can be used for the driving of the motor vehicle by means of the electric motor.

[0003] In such a motor vehicle, the battery device is increasingly commonly arranged in a floor assembly located in or under the floor, such that the battery device is partially directly integrated into the vehicle floor, forms the vehicle floor, or is arranged under the vehicle floor.

[0004] DE 10 2016 103 411 A1 discloses a motor vehicle having a battery device, the battery device having battery modules arranged in a receiving device, which is covered from below by a plate for protecting the battery device against collision damage from below. Here, when parked on a roadway or other object, etc., the plate serves as a protection device against thrown stones or other objects, so that a possible mechanical impact on the motor vehicle from below does not act on the battery device, but on the plate arranged to protect the battery device.

[0005] Here, during vehicle operation, it is not possible to evaluate whether the mechanical impact on the plate is not so severe, whether and how the plate is damaged, or whether the battery device covered by the plate is affected and damaged. The plate is usually also installed low on the motor vehicle, so that the driver of the motor vehicle cannot see the plate during driving operation and can only hardly inspect it even when stationary. Therefore, it is very likely that damage to the plate is not detected and thus, when further mechanical damage occurs subsequently, the requirements for protecting the battery device will no longer be met and the battery device will also be damaged as a result. In case of severe mechanical damage, in addition to damage to the plate, the battery device may also be damaged, which may not be detected at first until a defect (such as an electrical defect or a thermal effect caused by the damage) occurs in the battery device itself. However, in this case, damage to the battery device may already have led to corresponding losses or undesirable results. Summary of the Invention

[0006] Accordingly, an object of the present invention is to provide a motor vehicle having a protection device and a method for monitoring the protection device, which can immediately identify possible damage to the protection device, on the one hand, so as to be able to inspect the protection device in a timely manner, and on the other hand, so as to prevent damage to the battery device in the event of secondary mechanical damage when the protection device has been damaged.

[0007] The object regarding the motor vehicle is achieved by the features described below.

[0008] An embodiment of the present invention relates to a motor vehicle, especially at least partially electrically driven, which has a battery device with at least one battery cell, wherein the battery device is especially arranged in the floor area of the motor vehicle; the motor vehicle also has a protection device for protecting the battery device from mechanical influences, wherein the protection device has a protection plate, which is arranged such that it at least partially covers the battery device, so that possible mechanical influences are absorbed by the protection plate, and an acoustic monitoring device is provided, which acoustically monitors the protection plate and can output a signal when detecting typical noises of mechanical damage to the protection plate. Thus, the protection plate is acoustically monitored, and the noises generated when mechanical influences occur (such as contact or impact on the protection plate, etc.) are monitored. If such an influence is severe enough to generate typical noises of the protection plate, a signal indicating the occurrence of a correspondingly stronger mechanical influence causing such typical noises is output. If this is desired, subsequent actions can be initiated accordingly.

[0009] In an advantageous embodiment, it is convenient that the driver warning and / or fault storage input and / or workshop notification and / or fire brigade notification and / or emergency call and / or warning signal to surrounding traffic participants and / or disconnection of the high-voltage connection and / or activation of the hazard warning system can all be automatically performed based on the signal. Accordingly, it can be indicated that the protection plate and / or the battery device are damaged or further measures can be taken and / or prepared.

[0010] In another equally advantageous embodiment, the acoustic monitoring device includes at least one sound sensor and / or acoustic sensor and / or microphone for monitoring the protection plate. Thus, typical noises can be directly measured, for example, by means of structure-borne sound or airborne sound, etc. A plurality of such sensors or microphones can also be provided, which can be arranged at different positions in order to be able to better monitor more distant protection plate areas or protection plate sections if necessary.

[0011] Equally conveniently, the acoustic monitoring device is arranged near the protective plate, on the protective plate and / or arranged at a defined distance from the protective plate and / or integrated into the protective plate. For example, in particular, at least one sound sensor and / or acoustic sensor and / or microphone is arranged near the protective plate, on the protective plate and / or arranged at a defined distance from the protective plate and / or integrated into the protective plate. Thereby, the typical noise of the protective plate can be detected better.

[0012] Furthermore conveniently, the protective plate is a multi-layer board having at least three layers abutting against each other, that is, the multi-layer board has two outer layers and at least one inner layer arranged between the two outer layers, wherein the at least one inner layer is designed to be compressible and generate typical noise that can be monitored when compressed. Thereby, it is possible to monitor whether the inner layer of the protective plate that generates typical noise is compressed or damaged. Due to the number of inner layers and the matching of their materials, more than one type of typical noise can also be generated depending on which inner layer is damaged.

[0013] Particularly advantageously, the two outer layers are formed of a substantially incompressible material, while the at least one inner layer is formed of a compressible material, or a plurality of inner layers are provided, and the plurality of inner layers are formed of compressible materials, especially different compressible materials. Accordingly, a material can be selected for the inner layer such that a typical noise is generated when mechanical damage occurs, or different materials can be selected for the selected inner layers such that corresponding different typical noises are generated according to the damaged layer.

[0014] Also conveniently, the two outer layers are formed of a fiber-reinforced material as an incompressible material, while the at least one inner layer is formed of a foam material as a compressible material or the plurality of inner layers are each formed of different foam materials as compressible materials. The outer layer or layers can also be made of thin metal or other plastic materials, which in particular do not have fiber reinforcement or have other reinforcements.

[0015] The object regarding the method is achieved by the following features.

[0016] An embodiment of the present invention relates to a method for monitoring a protection device of a battery device of a motor vehicle, in particular an at least partially electrically driven motor vehicle, wherein the battery device has at least one battery cell, and a protection device is provided for protecting the battery device from mechanical influences, and the protection device has a protection plate which is arranged such that it at least partially covers the battery device, so that possible mechanical influences are absorbed by the protection plate, and an acoustic monitoring device is provided, and the monitoring device acoustically monitors the protection plate, and when the protection plate is mechanically damaged, the monitoring device detects such mechanical damage and outputs a signal based on the typical noise for the protection plate. Thereby, monitoring of the protection plate can be achieved, so that relevant damage can be indicated and / or further actions can be prepared or initiated.

[0017] Advantageously, a driver warning and / or a fault memory entry and / or a workshop notification and / or a fire brigade notification and / or an emergency call and / or a warning signal for surrounding traffic participants and / or a disconnection of the high-voltage connection and / or an activation of the hazard warning system are automatically carried out based on the signal. Thus, measures can be taken in particular for checking the protection device and / or the battery device or other warning and / or auxiliary measures can be taken.

[0018] Advantageously, the acoustic monitoring device includes at least one sound sensor and / or acoustic sensor and / or microphone which acoustically monitors the protection plate, and the signals of the monitoring device are evaluated to identify typical noises. Thereby, the typical noises expected to be generated can be immediately monitored.

[0019] Generally, the present invention discloses the following technical solutions of 1 and 8 herein, and the following 2-7 and 9-10 are preferred technical solutions:

[0020] 1. A motor vehicle (1), in particular an at least partially electrically driven motor vehicle (1), having a battery device (5) with at least one battery cell (7), wherein the battery device (5) is arranged in the floor area (8) of the motor vehicle (1); the motor vehicle further has a protection device (9) for protecting the battery device (5) from mechanical influences, wherein the protection device (9) has a protection plate (10) which is arranged such that it at least partially covers the battery device (5), so that possible mechanical influences are absorbed by the protection plate (10), and an acoustic monitoring device (11) is provided, and the acoustic monitoring device acoustically monitors the protection plate (10) and is capable of outputting a signal when a typical noise of mechanical damage to the protection plate (10) is detected.

[0021] 2. The motor vehicle (1) according to item 1 above, characterized in that the driver warning and / or fault storage input and / or workshop notice and / or fire brigade notice and / or emergency call and / or warning signal for surrounding traffic participants and / or disconnection of the high-voltage connection and / or activation of the hazard warning system can all be automatically executed based on said signal.

[0022] 3. The motor vehicle (1) according to item 1 or 2 above, characterized in that the acoustic monitoring device (11) includes at least one sound sensor and / or acoustic sensor and / or microphone for monitoring the protective plate (10).

[0023] 4. The motor vehicle (1) according to item 1, 2 or 3 above, characterized in that the acoustic monitoring device (11) is arranged near the protective plate (10), on the protective plate (10) and / or arranged at a defined distance from the protective plate (10) and / or integrated into the protective plate (10), for example, in particular, at least one sound sensor and / or acoustic sensor and / or microphone is arranged near the protective plate (10), on the protective plate (10) and / or arranged at a defined distance from the protective plate (10) and / or integrated into the protective plate (10).

[0024] 5. The motor vehicle (1) according to item 1, 2, 3 or 4 above, characterized in that the protective plate (10) is a multilayer plate (13) having at least three layers (14, 15, 16) that are in contact with each other, that is, the multilayer plate has two outer layers (14, 15) and at least one inner layer (16) arranged between the two outer layers (14, 15), wherein the at least one inner layer (16) is designed such that it is compressible and generates a typical noise that can be monitored when compressed.

[0025] 6. The motor vehicle (1) according to item 5 above, characterized in that the two outer layers (14, 15) are formed of a substantially incompressible material, while the at least one inner layer (16) is formed of a compressible material, or there are provided a plurality of inner layers (16, 16', 16''), and the plurality of inner layers are formed of compressible materials, especially different compressible materials.

[0026] 7. The motor vehicle (1) according to item 5 or 6 above, characterized in that the two outer layers (14, 15) are formed of a fiber-reinforced plastic as an incompressible material, while the at least one inner layer (16) is formed of a foam material as a compressible material, or the plurality of inner layers (16, 16', 16'') are respectively formed of different foam materials as compressible materials.

[0027] 8. A method for monitoring a protection device (9) of a battery device (5) of a motor vehicle (1), in particular an at least partially electrically driven motor vehicle (1), wherein the battery device (5) has at least one battery cell (7), and a protection device (9) is provided for protecting the battery device (5) against mechanical influences, wherein the protection device (9) has a protection plate (10) which is arranged such that it at least partially covers the battery device (5), so that possible mechanical influences are absorbed by the protection plate (10), and an acoustic monitoring device (11) is provided, wherein the monitoring device (11) acoustically monitors the protection plate (10), and when the protection plate (10) is mechanically damaged, the monitoring device (11) detects the mechanical damage and outputs a signal based on a typical noise for the protection plate (10).

[0028] 9. The method according to the preceding 8, characterized in that a driver warning and / or a fault memory entry and / or a workshop notification and / or a fire brigade notification and / or an emergency call and / or a warning signal for surrounding traffic participants and / or a disconnection of the high-voltage connection and / or an activation of a hazard warning system are automatically carried out based on the signal.

[0029] 10. The method according to the preceding 8 or 9, characterized in that the acoustic monitoring device (11) includes at least one sound sensor and / or acoustic sensor and / or microphone which acoustically monitors the protection plate (10), and the signal of the monitoring device (11) is evaluated in order to identify a typical noise. Description of the Drawings

[0030] The present invention will be described in detail below with reference to the embodiments and the accompanying drawings. In the drawings:

[0031] Figure 1 A schematic view of a motor vehicle with a battery device, a protection device and a monitoring device is shown,

[0032] Figure 2 A schematic cross-sectional view of the battery device and the protection device is shown,

[0033] Figure 3 Another schematic cross-sectional view of the battery device with the protection device is shown, and

[0034] Figure 4 A schematic cross-sectional view of the protection plate is shown. Detailed Description of the Embodiments

[0035] Figure 1A motor vehicle 1 is schematically illustrated. The motor vehicle 1 is, for example, at least partially electrically driven (such as an electric vehicle or a hybrid vehicle, a plug-in hybrid vehicle, etc.), and the motor vehicle has an electric motor 2 as a drive motor and another motor, such as an internal combustion engine, as a drive motor. In Figure 1 In an embodiment, the motor vehicle 1 is provided with two electric motors 2 as drive electric motors, wherein one electric motor 2 is arranged as a drive device on the front axle 3 and the other electric motor 2 is arranged as a drive device on the rear axle 4. Of course, it is also possible to provide only one electric motor 2, which drives the wheels of the front axle 3 and / or the rear axle 4.

[0036] The motor vehicle is further provided with a battery device 5, which has at least one battery cell 7 or at least one battery module 6 having at least one battery cell 7. In the illustrated embodiment, a plurality of battery modules 6 each having a plurality of battery cells 7 are schematically and symbolically shown.

[0037] The battery device 5 is preferably arranged in the floor area 8 of the motor vehicle 1, and thus the battery device is subject to external mechanical influences when the motor vehicle 1 is parked on the ground or due to, for example, a stone impact.

[0038] In order to protect the battery device 5 from mechanical influences, a protection device 9 is provided. The protection device 9 has at least one protection plate 10. The protection plate 10 is arranged such that it at least partially covers the battery device 5, so that possible mechanical influences can be absorbed by the protection plate 10. Figure 1 It is shown that the protection plate 10 is arranged in the floor area 8 of the motor vehicle 1 and extends below the battery device 5 and completely covers the battery device on the lower side of the battery device 5. Thus, it is possible to achieve that mechanical influences from below are absorbed by the protection plate 10. It is also possible that the protection plate 10 is additionally or alternatively arranged on at least one side of the battery device 5 and / or above the battery device 5, depending on from which direction the expected typical mechanical influences come and also depending on the arrangement of the battery device 5 in the motor vehicle 1.

[0039] Furthermore, an acoustic monitoring device 11 for acoustically monitoring the protection plate 10 is provided. The acoustic monitoring device 11 has at least one sound sensor and / or acoustic sensor and / or microphone for monitoring the at least one protection plate 10. In addition, the monitoring device 11 is designed to be connected or integrated with a control unit 12, which processes the signals received by the monitoring device 11 and thereby derives and initiates measures.

[0040] Here, the protection plate 10 is designed such that: when the damage exceeds a predetermined degree and the protection plate 10 is, for example, mechanically damaged during this process, the protection plate can generate typical noises in the case of mechanical damage.

[0041] The protection plate 10 is, for example, a flat plate or a three-dimensionally modeled plate, which has a defined structure, but more precisely a two-dimensionally extended structure, the surface dimensions of which are significantly larger than the dimensions in the direction perpendicular thereto. The protection plate 10 can also be a three-dimensional structure, such as a housing cover or a housing, etc.

[0042] If the acoustic monitoring device 11 detects a typical noise predefined as mechanical damage, it outputs a corresponding signal, which can be further processed in order to initiate predefined measures. In order to identify the typical noise, the acoustic monitoring device 11 preferably permanently or continuously receives the noise, optionally also processes these measured values and compares these measured values with predefined data of the typical noise in order to determine whether a typical noise has occurred. Here, the processing and identification can optionally be carried out in the monitoring device 11 or the control unit 12.

[0043] When a typical noise is identified, the control unit 12 can automatically process, execute or initiate driver warnings and / or fault storage inputs and / or workshop notifications and / or fire brigade notifications and / or emergency calls and / or warning signals for surrounding traffic participants and / or disconnection of the high-voltage connection and / or activation of the hazard warning system based on the signal thus generated. For this purpose, the control unit 12 can be connected to and / or integrated into other electronic units of the motor vehicle.

[0044] Thus, it is possible to, for example, inspect the protection plate 10 and replace the protection plate in the event of damage being identified. For example, in the case where the battery device 5 is also damaged and there is a concern about battery fire, etc., warnings or other measures can also be taken.

[0045] In order to monitor the protection plate 10, the acoustic monitoring device 11 can be installed or arranged near the protection plate 10, on the protection plate 10 and / or arranged at a defined distance from the protection plate 10 and / or integrated into the protection plate 10. Here, in particular, at least one sound sensor and / or acoustic sensor and / or one microphone or a plurality of microphones are respectively installed or arranged near the protection plate 10, on the protection plate 10 and / or arranged at a defined distance from the protection plate 10 and / or integrated into the protection plate 10.

[0046] Figure 2 A schematic example of the battery device 5 and the protection device 9 with the protection plate 10 is shown. The monitoring device 11 is integrated into the protection plate 10.

[0047] The protection board 10 is designed as a multilayer board 13 having at least three layers 14, 15, 16 that are in contact with each other. The multilayer board 13 is designed with two outer layers 14, 15 and at least one inner layer 16 arranged between these two outer layers 14, 15. Here, instead of one inner layer 16, multiple inner layers 16, 16', 16", etc. can also be provided (see Figure 4 ).

[0048] The at least one inner layer 16, 16', 16" is designed such that it is compressible and generates a typical noise that can be monitored when compressed.

[0049] The two outer layers 14, 15 are formed, for example, from a substantially incompressible material, while the at least one inner layer 16 is formed, for example, from a compressible material or the multiple inner layers 16, 16', 16" are formed from respective different compressible materials. Thus, one inner layer 16 can generate a typical noise or multiple inner layers 16, 16', 16" can generate their respective typical noises, which can be monitored and detected.

[0050] Particularly preferably, the two outer layers 14, 15 are formed, for example, from a fiber-reinforced plastic as an incompressible material. Additionally particularly preferably, the at least one inner layer 16 is formed from a foam material as a compressible material or the multiple inner layers 16, 16', 16" are respectively formed from different foam materials as compressible materials.

[0051] Figure 3 The battery device 5 is shown schematically, but this battery device only has the housing 18 of the battery module 6 and no battery cells 7 that still need to be inserted into the housing 18. A cooling plate 17 is arranged between the protection board 10 and the housing 18, and this cooling plate is intended to cool the battery module 6. The protection board 10 is arranged below the cooling plate 17 and covers the cooling plate. Advantageously, the housing 18 can be connected, for example, screwed to the body of the motor vehicle 1.

[0052] The method according to the invention provides acoustic monitoring of the protection board 10 by means of a monitoring device 11, wherein in the case of mechanical damage to the protection board 10, the monitoring device 11 detects this mechanical damage based on the typical noise of the protection board 10 and outputs a signal.

[0053] Therefore, based on this signal, driver warning and / or fault storage input and / or workshop notification and / or fire brigade notification and / or emergency call and / or warning signal for surrounding traffic participants and / or disconnection of the high-voltage connection and / or activation of the hazard warning system are automatically carried out.

[0054] Advantageously, the battery device 5 is a high-voltage battery device for voltages greater than 60V, especially in the range of 400V to 800V or higher.

[0055] Based on the typical noise, the type and degree of mechanical damage can be evaluated. Therefore, it is also possible to evaluate whether the protection plate 10 has impacted on the battery device 5 and / or the cooling plate 17 and the force or intensity of the impact. Here, the deformation noise of one inner layer 16 or multiple inner layers 16, 16', 16'' can also vary according to the speed and / or area, which can be taken into account.

[0056] One cooling plate 17 or multiple cooling plates 17 are preferably arranged between the battery device 5 and the protection plate 10.

[0057] If different inner layers 16, 16', 16'' are used, it is preferred that the stiffness of each inner layer 16, 16', 16'' is different and each inner layer 16, 16', 16'' generates different typical noises. Thus, the degree or force of mechanical damage to the protection plate 10, the cooling plate 17 and / or the battery device 5 can be inferred particularly advantageously.

[0058] It is also particularly advantageous that the protection plate 10 is designed as a sealed body as a whole, so that the internal area is sealed by these two outer layers 14, 15 against dust and water. Thus, the monitoring device 11 and / or the sensor and / or the microphone can be arranged in a protected manner, especially against dirt and / or water.

[0059] It is also preferred that the protection plate 10 locally abuts against the battery device 5 and is arranged at a distance from the battery device 5 in other areas. The protection plate 10 can also completely abut against the battery device 5 or be arranged at a complete distance from the battery device. Here, the spacing is preferably advantageous when the battery device 5 has a vertical structure (see Figure 3 the vertical wall 19 in

[0060] If typical noise is detected, the monitoring device 11 and / or the control unit 12 can output different information and / or instructions, where these information and / or instructions can be output according to the degree of damage in a graded manner, for example:

[0061] Level 1: Check and / or replace the protection plate 10 during the next maintenance, for example, in the case of damage to the protection plate 10;

[0062] Level 2: Go to the repair shop, for example, in the case of damage to the cooling system;

[0063] Level 3: Park the motor vehicle, for example, in the case of damage to the battery device;

[0064] Level 4: Stop immediately and get out of the motor vehicle, for example, in the case of serious damage to the battery device.

[0065] Likewise advantageously, the stiffnesses of the battery device 5 and / or the cooling plate 17 and / or the protection plate 10 are matched to one another such that different damages in levels 1 to 4 can be well distinguished from one another.

[0066] List of reference numerals

[0067] 1 Motor vehicle

[0068] 2 Electric motor

[0069] 3 Front axle

[0070] 4 Rear axle

[0071] 5 Battery device

[0072] 6 Battery module

[0073] 7 Battery cell

[0074] 8 Floor area

[0075] 9 Protection device

[0076] 10 Protection plate

[0077] 11 Monitoring device

[0078] 12 Control unit

[0079] 13 Multilayer board

[0080] 14 Outer layer

[0081] 15 Outer layer

[0082] 16 Inner layer

[0083] 16' Inner layer

[0084] 16” Inner layer

[0085] 17 Cooling plate

[0086] 18 Housing

[0087] 19 Wall

Claims

1. An at least partially electrically driven motor vehicle (1), having a battery device (5) with at least one battery cell (7), wherein the battery device (5) is arranged in the floor area (8) of the motor vehicle (1); the motor vehicle further has a protection device (9) for protecting the battery device (5) from mechanical influences, wherein the protection device (9) has a protection plate (10) which is arranged such that it at least partially covers the battery device (5), so that possible mechanical influences are absorbed by the protection plate (10), and wherein an acoustic monitoring device (11) is provided which acoustically monitors the protection plate (10) and is able to output a signal when a typical noise indicating mechanical damage to the protection plate (10) is detected; wherein the protection plate (10) is a multi-layer plate (13) having at least three layers (14, 15, 16) abutting one another, i.e., the multi-layer plate has two outer layers (14, 15) and at least one inner layer (16) arranged between the two outer layers (14, 15), and wherein the at least one inner layer (16) is designed such that it is compressible and generates a typical noise that can be monitored when compressed.

2. The motor vehicle (1) according to claim 1, characterized in that, Driver warning and / or fault storage input and / or workshop notification and / or fire brigade notification and / or emergency call and / or warning signal to surrounding traffic participants and / or disconnection of the high-voltage connection and / or activation of the hazard warning system can all be automatically performed based on the signal.

3. The motor vehicle (1) according to claim 1 or 2, characterized in that, The acoustic monitoring device (11) includes at least one sound sensor and / or acoustic sensor and / or microphone for monitoring the protection plate (10).

4. The motor vehicle (1) according to claim 1 or 2, characterized in that, The acoustic monitoring device (11) is arranged near the protection plate (10), on the protection plate (10) and / or is arranged at a defined distance from the protection plate (10) and / or is integrated into the protection plate (10).

5. The motor vehicle (1) according to claim 1 or 2, characterized in that, At least one sound sensor and / or acoustic sensor and / or microphone is arranged near the protection plate (10), on the protection plate (10) and / or is arranged at a defined distance from the protection plate (10) and / or is integrated into the protection plate (10).

6. The motor vehicle (1) according to claim 5, characterized in that, The two outer layers (14, 15) are formed of a substantially non-compressible material, while the at least one inner layer (16) is formed of a compressible material, or a plurality of inner layers (16, 16', 16”) are provided, the plurality of inner layers being formed of a compressible material.

7. The motor vehicle (1) according to claim 5, characterized in that, The two outer layers (14, 15) are formed of a fiber-reinforced plastic as the non-compressible material, while the at least one inner layer (16) is formed of a foam material as the compressible material, or the plurality of inner layers (16, 16', 16”) are each formed of a different foam material as the compressible material.

8. The motor vehicle (1) according to claim 5, characterized in that, The two outer layers (14, 15) are formed of a substantially incompressible material, while the at least one inner layer (16) is formed of a compressible material or is provided with a plurality of inner layers (16, 16', 16") which are formed of different compressible materials.

9. A method for monitoring a protection device (9) of a battery device (5) of at least partially electrically driven motor vehicle (1), wherein the battery device (5) has at least one battery cell (7), wherein a protection device (9) is provided for protecting the battery device (5) against mechanical influences, wherein the protection device (9) has a protection plate (10) which is arranged such that it at least partially covers the battery device (5) so that possible mechanical influences are absorbed by the protection plate (10), wherein an acoustic monitoring device (11) is provided, wherein the monitoring device (11) acoustically monitors the protection plate (10), and when the protection plate (10) is mechanically damaged, the monitoring device (11) detects the mechanical damage and outputs a signal based on a typical noise for the protection plate (10); wherein the protection plate (10) is a multilayer plate (13) having at least three layers (14, 15, 16) which are adjacent to one another, i.e. the multilayer plate has two outer layers (14, 15) and at least one inner layer (16) arranged between the two outer layers (14, 15), and wherein the at least one inner layer (16) is designed such that it is compressible and generates a typical noise which can be monitored when compressed.

10. The method according to claim 9, wherein Based on the signal, driver warning and / or fault memory entry and / or workshop notification and / or fire brigade notification and / or emergency call and / or warning signal for surrounding traffic participants and / or disconnection of the high voltage connection and / or activation of the hazard warning system are automatically carried out.

11. The method according to claim 9 or 10, characterized in that, The acoustic monitoring device (11) includes at least one sound sensor and / or acoustic sensor and / or microphone which acoustically monitors the protection plate (10), wherein the signals of the monitoring device (11) are evaluated in order to identify a typical noise.

Images