WO2023246793A1

WO2023246793A1 - Damage detection apparatus for battery bottom protection plate, battery protection structure, and vehicle

Info

Publication number: WO2023246793A1
Application number: PCT/CN2023/101442
Authority: WO
Inventors: 谭志佳; 万龙; 彭青波; 杨圣琳; 鲁鹏
Original assignee: 比亚迪股份有限公司
Priority date: 2022-06-21
Filing date: 2023-06-20
Publication date: 2023-12-28
Also published as: CN217786408U

Abstract

A damage detection apparatus (300) for a battery bottom protection plate. The damage detection apparatus (300) for a battery bottom plate comprises: sampling units (100) and a processing unit (10). Each sampling unit (100) comprises a magnetic core (110) and a coil (120). The magnetic cores (110) are suitable for being mounted on the battery bottom protection plate and forming a magnetic field, and the coils (120) are suitable for being mounted on the battery bottom protection plate and are located in the magnetic field. When the battery bottom protection plate is subjected to an energy shock, the magnetic cores (110) and the coils (120) move relative to each other, and the coils (120) cut the magnetic induction line of the magnetic field to generate a current. The processing unit (10) is connected to the coils (120) and is used for detecting the current generated by the coils. By means of the present solution, the stress condition of the battery bottom protection plate can be accurately detected, and the solution has the advantages of a high detection accuracy, a simple structure, etc. Also provided are a battery protection structure and a vehicle.

Description

Battery bottom shield damage detection device, battery protection structure and vehicle

Cross-references to related applications

This application claims priority for the Chinese patent application number "202221563992.5" titled "Battery Bottom Guard Damage Detection Device, Battery Protection Structure and Vehicle" submitted by BYD Co., Ltd. on June 21, 2022. All its contents are approved This reference is incorporated into this application.

Technical field

The present disclosure relates to the field of vehicle technology, and in particular, to a battery bottom guard panel damage detection device, a battery protection structure and a vehicle.

Background technique

In the related art, a pressure sensor is usually arranged between the battery bottom guard and the battery pack. The pressure sensor is used to detect the stress of the battery bottom guard to determine whether the battery bottom guard is damaged and thus determine the degree of harm to the battery pack caused by a collision.

However, the pressure sensor can only detect the stress on the battery bottom guard when it is subject to stress and strain. When the force-bearing position of the battery bottom guard is far away from the pressure sensor, the pressure sensor may only follow the vibration of the battery bottom guard and cannot accurately reflect the stress of the battery bottom guard, resulting in the pressure sensor not being able to accurately Check whether the battery bottom shield is damaged.

public content

The present disclosure aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present disclosure is to provide a battery bottom guard plate damage detection device that can accurately detect the stress of the battery bottom guard plate and has high detection accuracy and structure. Advantages such as simplicity.

According to the present disclosure, a battery protection structure having the above-mentioned battery bottom guard plate damage detection device is also proposed.

According to the present disclosure, a vehicle having the above battery protection structure is also proposed.

In order to achieve the above object, according to the first embodiment of the present disclosure, a battery bottom guard plate damage detection device is proposed, including: a sampling unit, the sampling unit includes a magnetic core and a coil, the magnetic core is suitable for installation on The battery bottom shield forms a magnetic field, and the coil is suitable for being installed on the battery bottom shield and located within the magnetic field. When the battery bottom shield is impacted by energy, the magnetic core and the coil move relative to each other. , the magnetic induction of the coil cutting the magnetic field a wire to generate current; and a processing unit connected to the coil for detecting the current generated by the coil.

According to the battery bottom guard plate damage detection device according to the embodiment of the present disclosure, the battery bottom guard plate damage detection device can accurately detect the stress condition of the battery bottom guard plate, and has the advantages of high detection accuracy and simple structure.

According to some examples of the present disclosure, the mass of the magnetic core and the mass of the coil are different, so that the magnetic core and the coil move relative to each other when the battery bottom shield is impacted by energy.

According to some examples of the present disclosure, the sampling unit further includes: a housing, the magnetic core and the coil are movably installed in the housing, and the coil has a first lead out of the housing. The processing unit is located outside the housing and connected to the first lead wire and the second lead wire.

According to some examples of the present disclosure, the sampling unit further includes: a buffer filled in the housing, and both the magnetic core and the coil are movably installed in the housing through the buffer. body.

According to some examples of the present disclosure, the housing is a non-metallic piece.

According to some examples of the present disclosure, the housing is a metal piece.

According to the second embodiment of the present disclosure, a battery protection structure is proposed, including: a battery bottom guard; and a battery bottom guard damage detection device according to the first embodiment of the present disclosure.

According to the battery protection structure according to the second embodiment of the present disclosure, by using the damage detection device of the battery bottom guard according to the first embodiment of the present disclosure, the stress condition of the battery bottom guard can be accurately detected, and has the ability to detect It has the advantages of high accuracy and simple structure.

According to some examples of the present disclosure, the battery bottom guard is provided with an installation groove, and the sampling unit is detachably embedded in the installation groove.

According to some examples of the present disclosure, the battery bottom protection plate includes: a buffer layer, the sampling unit is installed on the buffer layer; a first wear-resistant layer and a second wear-resistant layer, the first wear-resistant layer and the The second wear-resistant layer is disposed on both sides of the buffer layer in the thickness direction and covers the sampling unit.

According to some examples of the present disclosure, the sampling unit and the buffer layer are an integrally formed part.

According to some examples of the present disclosure, there are multiple sampling units, and the processing unit is connected to the coils of multiple sampling units; or there are multiple sampling units and processing units, and multiple processing units The units are respectively connected to the coils of multiple sampling units.

According to some examples of the present disclosure, a plurality of the sampling units are arranged at intervals along the length direction of the battery bottom guard; and/or, a plurality of the sampling units are arranged at intervals along the width direction of the battery bottom guard. .

According to some examples of the present disclosure, the axial direction of the coil is disposed along the thickness direction of the battery bottom shield.

According to a third embodiment of the present disclosure, a vehicle is provided, including: a vehicle body; a battery pack installed on the vehicle body; and a battery protection structure according to a second embodiment of the present disclosure, the battery The bottom guard is installed on at least one of the vehicle body and the battery pack, and the battery bottom guard is located below the battery pack.

The vehicle according to the third embodiment of the present disclosure can accurately detect the stress of the battery bottom guard plate by utilizing the battery protection structure according to the second embodiment of the present disclosure, and has the advantages of high detection accuracy and simple structure. advantage.

According to some examples of the present disclosure, the sampling unit is provided on a side of the battery bottom guard facing the battery pack.

Additional aspects and advantages of the disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosure.

Description of the drawings

The above and/or additional aspects and advantages of the present disclosure will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

Figure 1 is a schematic structural diagram of a sampling unit according to an embodiment of the present disclosure.

Figure 2 is an exploded view of a battery protection structure according to an embodiment of the present disclosure.

Figure 3 is an exploded view of a battery protection structure according to another embodiment of the present disclosure.

Figure 4 is a schematic diagram of the arrangement of sampling units on a battery protection structure according to an embodiment of the present disclosure.

Figure 5 is a schematic diagram of a vehicle according to an embodiment of the present disclosure.

Reference signs:
1. Battery protection structure; 2. Vehicle; 21. Body; 22. Battery pack;
100. Sampling unit; 110. Magnetic core; 120. Coil; 121. First lead wire; 122. Second lead wire;
130. Shell; 140. Buffer;
10. Processing unit;
200. Battery bottom protection plate; 210. Installation groove; 220. Buffer layer; 230. First wear-resistant layer; 240. Second wear-resistant layer;
300. Battery bottom guard plate damage detection device.

Detailed ways

The embodiments of the present disclosure are described in detail below. The embodiments described with reference to the drawings are exemplary. The detailed description below Embodiments of the present disclosure.

In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axis" The orientation or positional relationship indicated by "radial direction", "circumferential direction", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying the device or device to which it is referred. Elements must have a specific orientation, be constructed and operate in a specific orientation and therefore are not to be construed as limitations on the disclosure.

In the description of the present disclosure, "first feature" and "second feature" may include one or more of the features.

In the description of the present disclosure, "plurality" means two or more.

The battery bottom guard plate damage detection device 300 according to an embodiment of the present disclosure is described below with reference to the accompanying drawings.

As shown in FIGS. 1 to 4 , a battery bottom guard damage detection device 300 according to an embodiment of the present disclosure includes a sampling unit 100 and a processing unit 10 .

Specifically, the sampling unit 100 includes a magnetic core 110 and a coil 120 . The magnetic core 110 is suitable for being installed on the battery bottom shield 200 and forming a magnetic field, and the coil 120 is suitable for being installed on the battery bottom shield 200 and located within the magnetic field. When the battery bottom shield 200 is impacted by energy, the magnetic core 110 and the coil 120 move relative to each other, and the coil 120 cuts the magnetic flux lines of the magnetic field to generate current. The processing unit 10 is connected to the coil 120 and is used for detecting the current generated by the coil 120 .

For example, the processing unit 10 may be provided with a preset current value. When it is detected that the current generated by the coil 120 reaches the preset value, the processing unit 10 will determine that the battery bottom guard 200 may be damaged, so that the vehicle can be 2 Ignore the tiny vibrations produced when driving on ordinary ground. The coil 120 may be made of conductive metal such as copper wire or aluminum wire.

According to the battery bottom plate damage detection device 300 according to the embodiment of the present disclosure, the magnetic core 110 is installed on the battery bottom protective plate 200 and forms a magnetic field, and the coil 120 is installed on the battery bottom protective plate 200 and located within the magnetic field. That is to say, the magnetic core 110 and the coil 120 are respectively connected to the battery bottom shield 200 . When the battery bottom guard 200 does not collide or the collision force is small, and the vibration of the battery bottom guard 200 is small, the relative position of the coil 120 and the battery bottom guard 200 can remain relatively stable, and the magnetic core 110 can remain relatively stable relative to the battery bottom guard. The relative position of the plate 200 can remain relatively stable. In this way, the positions of the magnetic core 110 and the coil 120 are relatively fixed, the current generated by the sampling unit 100 is small or no current is generated, and the collision energy suffered by the battery bottom shield 200 is small and can be ignored. Therefore, the sampling unit 100 is prevented from being too sensitive to vibration, and the detection accuracy of the battery bottom guard plate damage detection device 300 is ensured.

In addition, when the battery bottom shield 200 is impacted by energy, the magnetic core 110 and the coil 120 move relative to each other, and the coil 120 cuts the magnetic flux lines of the magnetic field to generate current. The processing unit 10 is connected to the coil 120 and is used to detect the coil 120 the current generated. Specifically, when the battery bottom guard 200 is impacted by energy, that is, when it is hit by a collision, the battery bottom guard 200 will vibrate, and the magnetic core 110 will move relative to the battery bottom guard 200 due to the vibration of the battery bottom guard 200 . . At the same time, the coil 120 will also move relative to the battery bottom guard 200 due to the vibration of the battery bottom guard 200 , and the movement speed of the coil 120 relative to the battery bottom guard 200 is the same as the movement speed of the magnetic core 110 relative to the battery bottom guard 200 . The moving speeds are different, so that the magnetic core 110 and the coil 120 move relative to each other, and the magnetic core 110 undergoes reciprocating motion to generate eddy currents.

Moreover, the battery bottom guard 200 receives different energy impacts, and the relative movement speed and amplitude of the magnetic core 110 and the coil 120 are different. The greater the energy impact that the battery bottom shield 200 receives, the greater the current generated by the coil 120 . Therefore, the processing unit 10 can detect the current of the coil 120 to determine the magnitude of the energy impact received by the battery bottom guard 200 . Moreover, the battery bottom guard plate damage detection device 300 in the embodiment of the present disclosure does not need to be squeezed, and the vibration of the battery bottom guard plate 200 will almost always be transmitted to the battery bottom guard plate damage detection device 300 . The battery bottom guard plate damage detection device 300 can determine the magnitude of the energy impact received by the battery bottom guard plate 200 based on the vibration amplitude of the battery bottom guard plate 200, making the detection more accurate.

In this way, according to the battery bottom guard plate damage detection device 300 according to the embodiment of the present disclosure, the battery bottom guard plate damage detection device 300 can ignore the influence of small vibrations and accurately detect the stress of the battery bottom guard plate 200, and has the detection ability It has the advantages of high accuracy and simple structure.

In some specific embodiments of the present disclosure, the mass of the magnetic core 110 and the mass of the coil 120 are different, so that the two move relative to each other when the battery bottom shield 200 is impacted by energy.

For example, if the mass of the magnetic core 110 is greater than the mass of the coil 120 and the inertia of the magnetic core 110 is greater than the inertia of the coil 120, then the coil 120 will be less affected by the vibration of the battery bottom shield 200. That is to say, when the battery bottom guard 200 vibrates, the vibration frequency and vibration amplitude of the coil 120 relative to the battery bottom guard 200 are smaller, while the inertia of the magnetic core 110 is greater. The vibration frequency and vibration amplitude of the plate 200 are relatively large. As a result, relative motion occurs between the coil 120 and the magnetic core 110 , and the greater the energy impact that the battery bottom shield 200 receives, the greater the speed and amplitude of the relative motion between the magnetic core 110 and the coil 120 , thus The coil 120 can generate different currents according to the energy impact received by the battery bottom shield 200 . In addition, controllable relative position movement can also be formed based on the different fixing methods of the magnetic core 110 and the coil 120 to detect the damaged state. For example, the coil 120 is encapsulated with resin (such as epoxy, acrylic, polyurethane, etc.) to form a ring structure, and the magnetic core 110 can be made of damping materials (such as silicone rubber, nitrile rubber, foam materials and other highly elastic materials) Limit the position of magnetic core 110. Only when encountering an impact, the inertia of the magnetic core 110 can be relied upon to compress the highly elastic material to generate a signal.

In some specific embodiments of the present disclosure, as shown in FIG. 1 , the sampling unit 100 further includes a housing 130 .

Both the magnetic core 110 and the coil 120 are movably installed in the housing 130 . The coil 120 has a first lead wire 121 and a second lead wire 122 extending out of the housing 130 . The processing unit 10 is located outside the housing 130 and connected to the first lead wire 121 and the second lead wire 122 .

With this arrangement, the housing 130 can be used to fix the magnetic core 110 and the coil 120 and prevent the magnetic core 110 and the coil 120 from interfering with other components, so that the housing 130 can protect the magnetic core 110 and the coil 120 . Moreover, the magnetic core 110 and the coil 120 can move relative to the housing 130, so that relative movement can occur between the magnetic core 110 and the coil 120, and the coil 120 can cut the magnetic flux lines of the magnetic field to generate current.

In addition, by extending the first lead-out wire 121 and the second lead-out wire 122 out of the housing 130, the electrical connection between the processing unit 10 and the coil 120 can be facilitated. The coil 120 forms a loop with the processing unit 10 through the first lead wire 121 and the second lead wire 122 . The current generated by the coil 120 can flow to the processing unit 10 through the first lead wire 121 and the second lead wire 122 . The processing unit 10 can determine the magnitude of the energy impact suffered by the battery bottom shield 200 through the magnitude of the current generated by the coil 120 .

In some embodiments of the present disclosure, the housing 130 is a non-metallic piece. For example, the housing 130 may be a non-metallic component such as ceramic or engineering plastic. The non-metallic housing 130 will not affect the magnetic field of the coil 120 cutting the magnetic core 110, further improving the sampling unit 100's detection accuracy of the energy impact on the battery bottom guard 200, and making the measurement more accurate.

It can be understood that in some embodiments of the present disclosure, the housing 130 is a metal piece. For example, the housing 130 may be made of metal such as iron or aluminum. By using the housing 130 as a metal piece, the electromagnetic interference of the external magnetic field on the sampling unit 100 can be reduced, thereby ensuring the accuracy of the initial value of the current. Alternatively, when external electromagnetic interference is severe, by configuring the housing 130 as a metal piece, the housing 130 can shield the electromagnetic interference of the external magnetic field on the sampling unit 100, thereby improving the detection accuracy of the sampling unit 100.

In some specific embodiments of the present disclosure, as shown in FIG. 1 , the sampling unit 100 further includes a buffer 140 . Among them, the buffer member 140 can be made of low-modal silicone or foam material EPDM (Ethylene Propylene Diene Monomer).

Specifically, the buffer member 140 is filled in the housing 130 . Both the magnetic core 110 and the coil 120 are movably installed on the housing 130 through the buffer member 140 . With this arrangement, the buffer member 140 can not only fix the coil 120 and the magnetic core 110 , but also better transmit the vibration of the battery bottom shield 200 to the magnetic core 110 and the coil 120 . In addition, the buffer member 140 may be deformed. When the vibration ability of the battery bottom shield 200 is transmitted to the magnetic core 110 and the coil 120, the magnetic core 110 and the coil 120 can squeeze the buffer member 140 and move. The buffer member 140 will not completely block the magnetic core 110 and the coil. 120 moves, and the resistance of the buffer 140 to the coil 120 is greater, the vibration amplitude of the coil 120 relative to the battery bottom guard 200 is smaller, so that relative movement between the magnetic core 110 and the coil 120 is possible, and the coil 120 can move according to the battery The vibration energy of the bottom guard 200 generates currents of different sizes. In addition, the magnetic core 110 can be fixed by a hard material (usually a plastic part), so that the coil 120 moves independently under the restriction of the damping material. Alternatively, the coil 120 is encapsulated with resin to form a hard structure and then fixed, allowing the magnetic core 110 to move in a damped state.

In addition, the buffer member 140 can attenuate the vibration of the battery bottom guard 200 . For example, when the vehicle 2 is bumped while driving but the battery bottom guard 200 is not hit, the vibration energy of the battery bottom guard 200 is attenuated by the buffer 140 and the energy transferred to the magnetic core 110 and the coil 120 is reduced. Therefore, the current generated by the sampling unit 100 is smaller, and false alarms can be avoided.

The battery protection structure 1 according to the embodiment of the present disclosure is described below with reference to FIGS. 2 and 3 . The battery protection structure 1 includes a battery bottom guard 200 and a battery bottom guard damage detection device 300 according to the above embodiment of the present disclosure.

According to the battery protection structure 1 of the embodiment of the present disclosure, by using the battery bottom guard plate damage detection device 300 according to the above embodiment of the present disclosure, the influence of small vibrations can be ignored, and the force of the battery bottom guard plate 200 can be accurately detected. It has the advantages of high detection accuracy and simple structure.

In some specific embodiments of the present disclosure, as shown in FIGS. 2 and 3 , the battery bottom guard 200 is provided with a mounting groove 210 . The sampling unit 100 is detachably embedded in the installation groove 210 . Therefore, the installation groove 210 of the battery bottom guard 200 can pre-position the sampling unit 100 to facilitate the assembly of the sampling unit 100 . Moreover, the connection between the sampling unit 100 and the battery bottom guard 200 can be made more reliable, and the vibration of the battery bottom guard 200 can be better transmitted to the sampling unit 100, further improving the performance of the battery bottom guard damage detection device 300. Detection accuracy.

In addition, the sampling unit 100 can be detachably installed on the battery bottom guard 200 through the installation groove 210 . The battery bottom guard 200 is detachably installed on the battery pack 22 . With this arrangement, the battery bottom guard 200 can be replaced separately without the need to disassemble and replace the battery pack 22 and the sampling unit 100, thereby saving costs. When installing or repairing the sampling unit 100, only the battery bottom guard needs to be removed. The board 200 can be disassembled alone, and there is no need to disassemble the battery pack 22, making the operation more convenient.

In some specific embodiments of the present disclosure, as shown in FIGS. 2 and 3 , the battery bottom protection plate 200 includes a buffer layer 220 , a first wear-resistant layer 230 and a second wear-resistant layer 240 .

Specifically, the sampling unit 100 is installed on the buffer layer 220 . The first wear-resistant layer 230 and the second wear-resistant layer 240 are provided on both sides of the buffer layer 220 in the thickness direction and cover the sampling unit 100 .

For example, the mounting groove 210 may be provided on the buffer layer 220 . The sampling unit 100 is installed in the installation groove 210 of the buffer layer 220, and after the buffer layer 220, the first wear-resistant layer 230 and the second wear-resistant layer 240 are combined, the Hot pressing composite integral molding. Therefore, the first wear-resistant layer 230 and the second wear-resistant layer 240 can improve the structural strength of the battery bottom guard 200 , thereby improving the protective effect of the battery bottom guard 200 on the battery pack 22 . At the same time, the first wear-resistant layer 230 and the second wear-resistant layer 240 can protect the buffer layer 220 and the sampling unit 100 to avoid damage to the sampling unit 100, further improving the detection accuracy of the sampling unit 100.

Moreover, by disposing the sampling unit 100 on the buffer layer 220, the buffer layer 220 plays a certain buffering role. When the energy impact of the battery bottom guard 200 is small, the buffer layer 220 can buffer the vibration of the battery bottom guard 200, thereby reducing the impact of small vibrations on the sampling unit 100, so that the battery bottom guard damage detection device 300 can Filtering small collisions of the battery bottom guard 200 or small vibrations when the vehicle 2 is driving prevents the sampling unit 100 from being overly sensitive, further improving the detection accuracy of the battery bottom guard damage detection device 300 .

Further, as shown in FIG. 2 , the sampling unit 100 and the buffer layer 220 are integrally formed parts. As a result, not only can the structures of the sampling unit 100 and the buffer layer 220 be simplified to facilitate assembly, but the connection strength between the sampling unit 100 and the buffer layer 220 is higher, and relative movement between the buffer layer 220 and the sampling unit 100 is less likely to occur. The buffer layer 220 The buffering effect is better, and is conducive to improving the detection accuracy of the battery bottom guard plate damage detection device 300.

In some specific embodiments of the present disclosure, as shown in Figures 2-4, there are multiple sampling units 100. The processing unit 10 is connected to the coils 120 of a plurality of sampling units 100 . That is to say, one processing unit 10 receives electrical signals from multiple sampling units 100 at the same time. This arrangement is beneficial to reducing the number of parts of the battery bottom guard plate damage detection device 300, and the processing unit 10 has a higher integration level and is easier to arrange. Moreover, the detection of each area of the battery bottom guard 200 is more accurate, and the location where the battery bottom guard 200 is impacted can be accurately located. In addition, the damage condition of the battery bottom guard 200 can also be determined based on the different currents of each sampling unit 100, which facilitates the processing unit 10 to perform different processing and has greater applicability.

In other specific embodiments of the present disclosure, there are multiple processing units 10 . The processing unit 10 is respectively connected to the coils 120 of the plurality of sampling units 100. That is to say, multiple processing units 10 and multiple sampling units 100 correspond one to one. Each processing unit 10 is only responsible for receiving and processing the electrical signal of one sampling unit 100 . Therefore, mutual interference of electrical signals of multiple sampling units 100 can be avoided, the processing unit 10 has higher accuracy, and the detection effect is also more accurate.

In some specific embodiments of the present disclosure, multiple sampling units 100 are arranged at intervals along the length direction of the battery bottom guard 200 . And/or, the plurality of sampling units 100 are arranged at intervals along the width direction of the battery bottom shield 200 . Therefore, the plurality of sampling units 100 can be arranged in multiple rows and columns along the length direction and width direction of the battery bottom guard 200 .

It can be understood that when the current generated by the sampling unit 100 is large, it may be that the battery bottom guard 200 has been impacted, or it may be that when the vehicle 2 is driving in poor road conditions, the overall vibration of the vehicle 2 is large, and the battery Bottom guard The vibration of 200 is also larger, resulting in a larger current generated by the sampling unit 100 . However, the battery bottom guard 200 was not seriously damaged at this time.

Therefore, when the vehicle 2 vibrates, the vibration state of the single-row sampling unit 100 or the single-row sampling unit 100 will be the same. By arranging the plurality of sampling units 100 in this way, when the current of the single row sampling unit 100 or the single column sampling unit 100 is large, the processing unit 10 can determine that the vehicle 2 is driving on a road with bad road conditions, thereby not judging the battery bottom protection. Board 200 was damaged.

However, when the battery bottom shield 200 is damaged by a collision, the difference in the collision area will cause the currents generated by the multiple sampling units 100 to be different. The currents generated by the single-row sampling unit 100 and the multiple sampling units 100 in the single-row sampling unit 100 are different. At this time, the processing unit 10 can detect that the current of some sampling units 100 is larger, and can determine based on the magnitude of the current. Because the corresponding part of the sampling unit 100 is damaged, the detection accuracy is higher.

In some specific embodiments of the present disclosure, as shown in FIGS. 2-4 , the axial direction of the coil 120 is disposed along the thickness direction of the battery bottom shield 200 .

For example, the magnetic core 110 may be cylindrical, the coil 120 surrounds the magnetic core 110 along its circumferential direction, and the axial direction of the magnetic core 110 is also disposed along the thickness direction of the battery bottom shield 200 . But not limited to this.

It can be understood that when the battery bottom guard 200 vibrates, the amplitude along the thickness direction of the battery bottom guard 200 will be larger. By arranging the axial direction of the coil 120 and the axial direction of the magnetic core 110 along the thickness direction of the battery bottom guard 200 , the vibration of the battery bottom guard 200 can be better transmitted to the coil 120 , so that the coil 120 can follow the battery bottom guard. 200 vibrations. At the same time, the coil 120 can move relative to the magnetic core 110, which is conducive to more accurately converting the energy impact on the battery bottom guard 200 into the current of the coil 120, further improving the detection of the battery bottom guard damage detection device 300. accuracy.

The following describes a vehicle 2 according to an embodiment of the present disclosure with reference to FIG. 5 . The vehicle 2 includes a body 21 , a battery pack 22 and a battery protection structure 1 according to the above embodiment of the present disclosure.

Specifically, the battery pack 22 is installed on the vehicle body 21 . The battery bottom guard 200 is installed on at least one of the vehicle body 21 and the battery pack 22 and is located below the battery pack 22 . Therefore, the battery bottom guard 200 can protect the bottom of the battery pack 22 to prevent stones or road bumps from directly causing damage to the bottom of the battery pack 22 . Moreover, the battery bottom guard 200 can be replaced separately. When disassembling the battery bottom guard 200, there is no need to disassemble the battery pack 22, making disassembly and assembly more convenient.

According to the vehicle 2 according to the embodiment of the present disclosure, by using the battery protection structure 1 according to the above embodiment of the present disclosure, the influence of small vibrations can be ignored and the stress condition of the battery bottom guard 200 can be accurately detected, which has the advantages of high detection accuracy and simple structure. Etc.

In some specific embodiments of the present disclosure, as shown in FIG. 3 , the sampling unit 100 is provided on the side of the battery bottom guard 200 facing the battery pack 22 .

With this arrangement, the side of the battery bottom guard 200 facing away from the battery pack 22 can block the sampling unit 100 , thereby protecting the sampling unit 100 and preventing damage to the sampling unit 100 , thus ensuring the detection accuracy of the sampling unit 100 . Moreover, the sampling unit 100 can be exposed on the side of the battery bottom guard 200 facing the battery pack 22 , so that the sampling unit 100 is easier to install on the battery bottom guard 200 and can be disassembled more simply, further simplifying the operation of the sampling unit 100 and the battery pack 22 . The connection structure of the battery bottom shield 200.

Other components and operations of the battery bottom guard panel damage detection device 300 , the battery protection structure 1 and the vehicle 2 according to the embodiment of the present disclosure are all known to those of ordinary skill in the art and will not be described in detail here.

In the description of this specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" or the like is intended to be incorporated into the description of the implementation. An example or example describes a specific feature, structure, material, or characteristic that is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example.

Although the embodiments of the present disclosure have been shown and described, those of ordinary skill in the art will appreciate that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and purposes of the disclosure. The scope of the disclosure is defined by the claims and their equivalents.

Claims

A battery bottom guard plate damage detection device (300), which is characterized by including:

Sampling unit (100). The sampling unit (100) includes a magnetic core (110) and a coil (120). The magnetic core (110) is suitable for being installed on the battery bottom shield (200) and forming a magnetic field. The coil (120) is suitable for being installed on the battery bottom shield (200) and located within the magnetic field. When the battery bottom shield (200) is impacted by energy, the magnetic core (110) and the coil (120) ) undergoes relative motion, and the coil (120) cuts the magnetic field lines of the magnetic field to generate current; and

A processing unit (10). The processing unit (10) is connected to the coil (120) and is used to detect the current generated by the coil (120).
The battery bottom shield damage detection device (300) according to claim 1, characterized in that the mass of the magnetic core (110) and the mass of the coil (120) are different, so that the magnetic core (110) has a different mass than the coil (120). 110) and the coil (120) move relative to each other when the battery bottom guard (200) is impacted by energy.
The battery bottom guard damage detection device (300) according to claim 1 or 2, characterized in that the sampling unit (100) further includes:

The housing (130), the magnetic core (110) and the coil (120) are all movably installed in the housing (130), and the coil (120) has a structure extending out of the housing (130). ), the processing unit (10) is located outside the housing (130) and connected to the first lead wire (121) and the second lead wire (122). The lead wires (122) are connected.
The battery bottom guard damage detection device (300) according to claim 3, characterized in that the sampling unit (100) further includes:

Buffer (140), the buffer (140) is filled in the housing (130), and the magnetic core (110) and the coil (120) are movably passed through the buffer (140) Installed on the housing (130).
The battery bottom guard plate damage detection device (300) according to claim 3 or 4, characterized in that the housing (130) is a non-metallic part.
The battery bottom guard plate damage detection device (300) according to claim 3 or 4, characterized in that the housing (130) is a metal piece.
A battery protection structure (1), characterized by including:

Battery bottom guard (200); and

The battery bottom guard plate damage detection device (300) according to any one of claims 1-6.
The battery protection structure (1) according to claim 7, characterized in that the battery bottom protection plate (200) A mounting slot (210) is provided, and the sampling unit (100) is detachably embedded in the mounting slot (210).
The battery protection structure (1) according to claim 7 or 8, characterized in that the battery bottom protection plate (200) includes:

Buffer layer (220), the sampling unit (100) is installed on the buffer layer (220);

A first wear-resistant layer (230) and a second wear-resistant layer (240). The first wear-resistant layer (230) and the second wear-resistant layer (24) are respectively arranged at the thickness of the buffer layer (220). direction and covers the sampling unit (100).
The battery protection structure (1) according to claim 9, characterized in that the sampling unit (100) and the buffer layer (220) are integrally formed parts.
The battery protection structure (1) according to any one of claims 7-10, characterized in that there are multiple sampling units (100), and the processing unit (10) and the plurality of sampling units (100) are The coil (120) of 100) is connected; or

There are multiple sampling units (100) and multiple processing units (10), and multiple processing units (10) are respectively connected to coils (120) of multiple sampling units (100).
The battery protection structure (1) according to claim 11, characterized in that a plurality of the sampling units (100) are arranged at intervals along the length direction of the battery bottom protection plate (200); and/or

A plurality of the sampling units (100) are arranged at intervals along the width direction of the battery bottom guard (200).
The battery protection structure (1) according to any one of claims 7-12, characterized in that the axial direction of the coil (120) is arranged along the thickness direction of the battery bottom protection plate (200).
A vehicle (2), characterized in that it includes:

body(21);

A battery pack (22), the battery pack (22) is installed on the vehicle body (21); and

The battery protection structure (1) according to any one of claims 7-13, the battery bottom guard (200) is installed on at least one of the vehicle body (21) and the battery pack (22), And the battery bottom protective plate (200) is located below the battery pack (22).
The vehicle (2) according to claim 14, characterized in that the sampling unit (100) is provided on a side of the battery bottom guard (200) facing the battery pack (22).