Bottom protection plate, battery pack and electric equipment

Abstract

The utility model relates to the technical field of battery packs, in particular to a bottom protection plate, a battery pack and electric equipment. The bottom protection plate comprises a reinforcing layer, the repairing layer covers at least part of the reinforcing layer, a closed containing cavity is formed in the repairing layer, the containing cavity is filled with a repairing agent, and when the repairing layer cracks, the repairing agent in the containing cavity leaks to block cracks of the repairing layer. According to the technical scheme, the problem that the service life of the bottom protection plate is short in the prior art can be effectively solved.

Description

Technical Field

[0001] This application relates to the technical field of battery packs, and in particular, to a bottom guard plate, a battery pack, and an electrical device. Background Art

[0002] In recent years, new energy devices have received increasing attention and favor from the public due to their environmental friendliness and economy. As the power source of new energy devices, the improvement of the stability and impact resistance of battery packs has become one of the difficult points that need to be overcome in the new energy field.

[0003] In the battery pack protection design of related technologies, a bottom guard plate is added at the bottom of the battery pack to play a protective role. The bottom guard plate generally includes a strengthening layer, a protective layer, and a foaming layer. The foaming layer mainly plays a role in buffering energy absorption and heat insulation. The strengthening layer is the main component to resist external mechanical impacts, and its mechanical strength directly determines the impact resistance of the guard plate. The protective layer mainly plays a role in protecting the strengthening layer.

[0004] However, the protective layer is prone to cracks after being impacted, and external oxygen, water vapor, etc. are likely to contact the strengthening layer along the cracks, increasing the corrosion rate of the metal plate and affecting the service life of the bottom guard plate. Summary of the Utility Model

[0005] This application provides a bottom guard plate, a battery pack, and an electrical device, aiming to solve the problem of the low service life of the bottom guard plate in related technologies.

[0006] On the one hand, this application provides a bottom guard plate, including: a strengthening layer; a repair layer covering at least part of the strengthening layer, a closed receiving cavity is provided in the repair layer, and a repair agent is filled in the receiving cavity. When the repair layer is broken, the repair agent in the receiving cavity leaks out to block the cracks in the repair layer.

[0007] In some embodiments of this application, the repair layer includes a repair plate and a flexible wrapping body provided in the repair plate. The inner cavity of the flexible wrapping body forms the receiving cavity. When the repair plate is broken, the flexible wrapping body follows the repair plate to break, and the repair agent in the flexible wrapping body leaks out to block the cracks in the repair plate.

[0008] In some embodiments of this application, the flexible wrapping body includes a capsule structure, the capsule structures are dispersedly arranged in the repair plate, the inner cavity of the capsule structure forms the receiving cavity, and the repair agent is encapsulated in the capsule structure.

[0009] In some embodiments of this application, the flexible wrapping body includes a flexible tube body, the inner part of the flexible tube body forms the receiving cavity, and the repair agent is filled in the flexible tube body.

[0010] In some embodiments of this application, at least one port of the flexible tube body penetrates through the edge of the repair plate and communicates with the outside.

[0011] In some embodiments of the present application, the flexible pipe body includes a plurality of flexible pipe bodies, and the plurality of flexible pipe bodies are interconnected.

[0012] In some embodiments of the present application, a catalyst is further provided in the repair layer. When the repair agent leaks out, the repair agent and the catalyst react in contact to form a plugging material to plug the cracks in the repair layer.

[0013] In some embodiments of the present application, the repair layer is wrapped around the outside of the reinforcement layer.

[0014] In some embodiments of the present application, the repair layer includes a first repair layer and a second repair layer, the reinforcement layer includes a first surface and a second surface arranged opposite to each other along the thickness direction, and the first repair layer and the second repair layer are arranged on both sides of the reinforcement layer along the thickness direction of the reinforcement layer;

[0015] The orthographic projection of the first repair layer on the surface where the first surface is located covers the first surface; and / or the orthographic projection of the second repair layer on the surface where the second surface is located covers the second surface.

[0016] In some embodiments of the present application, the bottom guard plate further includes a foaming layer, and the foaming layer is arranged on a side of the repair layer away from the reinforcing layer.

[0017] In some embodiments of the present application, the bottom guard plate further includes a protective layer, which covers the surface of the repair layer facing away from the reinforcement layer.

[0018] In some embodiments of the present application, the material of the protective layer is glass fiber; and / or the reinforcing layer is metal.

[0019] In a second aspect, the present application provides a battery pack, comprising the above-mentioned bottom guard plate.

[0020] In a third aspect, the present application provides an electrical device including the above-mentioned battery pack.

[0021] In the bottom guard plate, battery pack and electrical equipment provided by the present application, the bottom guard plate includes a reinforcement layer and a repair layer. In view of the covering relationship between the repair layer and the reinforcement layer, the repair layer can shield the reinforcement layer, thereby protecting the reinforcement layer. When cracks appear in the repair layer, the accommodating cavity ruptures along with the repair layer. At this time, the repair agent in the accommodating cavity can leak out, thereby blocking the cracks in the repair layer, blocking the channel for water vapor and oxygen to contact the reinforcement layer, reducing the probability of corrosion of the reinforcement layer, and enabling the reinforcement layer to ensure sufficient strength, thereby extending the service life of the reinforcement layer and the service life of the bottom guard plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0023] Figure 1 It is a schematic structural diagram of the bottom guard plate of the battery pack provided in the related art;

[0024] Figure 2 It is a schematic structural diagram of the bottom guard plate of the battery pack provided in an embodiment of the present application;

[0025] Figure 3 It is a schematic structural diagram of the bottom guard plate of the battery pack provided in another embodiment of the present application;

[0026] Figure 4 It is an enlarged schematic structural diagram of the repair layer of the battery pack provided in the embodiment of the present application, where Figure 4 the capsule structure is shown;

[0027] Figure 5 It is an enlarged schematic structural diagram of the repair layer of the battery pack provided in the embodiment of the present application, where Figure 5 the flexible tube body is shown.

[0028] Explanation of reference numerals:

[0029] 10. Bottom guard plate;

[0030] 100. Reinforcement layer;

[0031] 200. Repair layer; 201. Accommodation cavity; 210. First repair layer; 211. Repair plate; 212. Capsule structure; 213. Flexible tube body; 220. Second repair layer;

[0032] 300. Foaming layer;

[0033] 400. Protective layer; 410. First protective layer; 420. Second protective layer. Detailed implementation manners

[0034] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0035] In recent years, new energy devices have received increasing attention and favor from the public due to their environmental protection and economy. As the power source of new energy devices, the improvement of the stability and impact resistance of the battery pack has become one of the difficult points that need to be overcome urgently in the new energy field.

[0036] Taking an automobile as an example, during actual driving, the battery pack located at the bottom of the automobile is extremely likely to cause damage to the internal components of the pack due to the impact or extrusion of stones or metal sharp objects on the road surface, and even cause a high-voltage short circuit, resulting in a safety accident. Therefore, how to effectively improve the impact resistance of the battery pack and ensure the integrity of the internal components of the pack has become one of the difficult points that new energy vehicle enterprises urgently need to overcome.

[0037] In the battery pack protection design of related technologies, a bottom guard plate is usually added at the bottom of the battery pack to play a protective role. As Figure 1 shown, the current bottom guard plate generally includes a strengthening layer 100, a protective layer 400, and a foaming layer 300. The foaming layer 300 can play a role in shock absorption, buffering, energy absorption, and heat insulation. The strengthening layer 100 is generally a metal structure and is the main component to resist external mechanical impacts. Its mechanical strength directly determines the impact resistance of the guard plate. The material of the protective layer 400 is fiberglass, and the protective layer 400 can be wrapped outside the strengthening layer 100 to extend the service life of the strengthening layer 100.

[0038] After research, the inventor found that the protective layer 400 is prone to generating cracks after being impacted, and external oxygen, water vapor, etc. are easily in contact with the strengthening layer along the cracks. Since the strengthening layer is made of metal, the contact between oxygen, water vapor and the metal increases the corrosion rate of the strengthening layer and affects the service life of the bottom guard plate.

[0039] In view of this, the present application provides a bottom guard plate, a battery pack, and an electrical device. The bottom guard plate includes a strengthening layer and a repair layer. The repair layer can cover the strengthening layer, and a repair agent is provided in the repair layer. When the repair layer is impacted and generates cracks, the repair agent can leak out to the cracks to block the cracks, thereby blocking the channels for water vapor and oxygen to contact the strengthening layer, so as to reduce the probability of the strengthening layer being corroded.

[0040] The structure of the bottom guard plate will be described below with reference to the drawings.

[0041] Figure 2 is a schematic structural diagram of the bottom guard plate of the battery pack provided by an embodiment of the present application; Figure 4 is an enlarged structural diagram of the repair layer of the battery pack provided by an embodiment of the present application, where Figure 4 shows the capsule structure; Figure 5 is an enlarged structural diagram of the repair layer of the battery pack provided by an embodiment of the present application, where Figure 5 shows the flexible tube body.

[0042] Referring to Figure 2 、 Figure 4 and Figure 5 shown, the present application provides a bottom guard plate 10 including: a strengthening layer 100 and a repair layer 200.

[0043] Among them, the repair layer 200 covers at least a part of the reinforcement layer 100. A closed accommodation cavity 201 is arranged in the repair layer 200, and the accommodation cavity 201 is filled with a repair agent. When the repair layer 200 is broken, the repair agent in the accommodation cavity 201 leaks out to block the crack of the repair layer 200.

[0044] Applying the bottom guard plate of this embodiment includes the reinforcement layer 100 and the repair layer 200. In view of the covering relationship between the repair layer 200 and the reinforcement layer 100, the repair layer 200 can form an occlusion for the reinforcement layer 100, thereby playing a role in protecting the reinforcement layer 100. When cracks occur in the repair layer, the accommodation cavity 201 follows the repair layer 200 and breaks. At this time, the repair agent in the accommodation cavity 201 can leak out, thereby blocking the crack of the repair layer 200, blocking the channels for water vapor and oxygen to contact the reinforcement layer, reducing the probability of the reinforcement layer 100 being corroded, enabling the reinforcement layer 100 to ensure a sufficient large strength, extending the service life of the reinforcement layer 100, and also extending the service life of the bottom guard plate 10.

[0045] In addition, the bottom guard plate of this embodiment can automatically repair according to the damage condition of the repair layer 200 and actively repair the cracks, pinholes and other defects existing in the repair layer 200 in a timely manner, ensuring the corrosion resistance of the reinforcement layer 100, that is, realizing the "self-repair" function of the repair layer 200.

[0046] In view of the self-repair method of the bottom guard plate 10, the bottom guard plate 10 can be repaired in situ in a timely manner, greatly saving the labor cost and maintenance cost during the maintenance process, and reducing the maintenance cost of the bottom guard plate during operation;

[0047] Exemplarily, the reinforcement layer 100 can be made of a metal material. The metal material has a large strength and a strong ability to resist external mechanical impacts, which helps to improve the strength of the bottom guard plate 10 and plays a role in protecting the battery pack. The thickness of the reinforcement layer 100 can be between 0.5 mm and 2 mm.

[0048] In order to improve the protection effect of the repair layer 200 on the reinforcement layer 100, in some embodiments, the repair layer 200 can be wrapped outside the reinforcement layer 100, so as to achieve close protection of the reinforcement layer 100.

[0049] Specifically, Figure 3 is a schematic structural diagram of the bottom guard plate of the battery pack provided in another embodiment of the present application. As Figure 3 shown, the repair layer 200 includes a first repair layer 210 and a second repair layer 220. The reinforcement layer 100 includes a first surface and a second surface oppositely arranged along the thickness direction. The first repair layer 210 and the second repair layer 220 are respectively arranged on both sides of the reinforcement layer 100 along the thickness direction of the reinforcement layer 100, so as to protect the reinforcement layer 100.

[0050] Further, the positive projection of the first repair layer 210 on the plane where the first surface is located covers the first surface, thereby playing a protective role for the first surface. The positive projection of the second repair layer 220 on the plane where the second surface is located covers the second surface, thereby playing a protective role for the second surface.

[0051] Of course, the first repair layer 210 and the second repair layer 220 can also cover the edges of the reinforcing layer 100, thereby playing a protective role for the edges of the reinforcing layer 100.

[0052] Based on the above settings of the first repair layer 210 and the second repair layer 220, the first surface and the second surface of the reinforcing layer 100 can be shielded and protected. When the bottom protection plate is damaged, the first repair layer 210 or the second repair layer 220 is damaged prior to the reinforcing layer 100. Once the first repair layer 210 or the second repair layer 220 is damaged, the repair agent can leak out from the accommodation cavity 201 to repair the first repair layer 210 or the second repair layer 220. While ensuring the strength of the first repair layer 210 and the second repair layer 220, it can also play a role in blocking the contact of water vapor, oxygen, etc. with the reinforcing layer 100, ensuring the service life of the reinforcing layer 100.

[0053] Further, as Figure 4 and Figure 5 shown, in some embodiments, the repair layer 200 includes a repair plate 211 and a flexible wrapper disposed within the repair plate 211. The inner cavity of the flexible wrapper forms an accommodation cavity 201. When the repair plate 211 ruptures, the flexible wrapper can rupture along with the repair plate 211, so that the repair agent within the flexible wrapper leaks out to seal the crack of the repair plate 211.

[0054] It should be noted that, in some embodiments, the repair agent can seal the crack by physical means.

[0055] Specifically, in the case where the repair agent seals the crack by physical means, the repair agent can be powder, particulate matter or paste. When the repair layer 200 is not damaged, the repair agent can be encapsulated inside the flexible wrapper. When the repair layer 200 is damaged, the flexible wrapper ruptures along with the damage of the repair layer 200, and the repair agent can leak out from the rupture of the flexible wrapper, thereby sealing the crack of the repair layer 200. Exemplarily, in the case where the repair agent is powder, particulate matter or paste, the repair agent can be filled into the crack to seal the crack.

[0056] In some other embodiments, the repair agent can also seal the crack by chemical means.

[0057] Specifically, a catalyst may also be provided in the repair layer 200. When the repair agent leaks out, the repair agent reacts with the catalyst to form a plugging material to plug the cracks in the repair layer 200.

[0058] The specific structure of the flexible inclusion will be described below with reference to the accompanying drawings.

[0059] As Figure 4 shown, in some embodiments, the flexible inclusion includes a capsule structure 212, which is dispersedly arranged in the repair plate 211. The inner cavity of the capsule structure 212 forms a receiving cavity 201, and the repair agent is encapsulated in the capsule structure 212.

[0060] The capsule structure 212 is a microcapsule structure. After the repair agent is encapsulated in the capsule structure 212, during the processing of the repair layer 200, the capsule structure 212 encapsulating the repair agent is embedded into the interior of the repair plate 211.

[0061] In the case of plugging the cracks by chemical means, a catalyst needs to be added during the processing of the repair plate 211. When the repair plate 211 is cracked under the pressure applied from the outside, the capsule structure 212 at the crack in the interior of the repair plate 211 will be damaged and broken, causing the internal repair agent to leak out. When the internal repair agent encounters the catalyst inside the repair plate 211, a chemical reaction will occur, thereby achieving the purpose of repairing the crack damage at the damaged part.

[0062] As Figure 5 shown, in some embodiments, the flexible inclusion further includes a flexible tube 213. The interior of the flexible tube 213 forms a receiving cavity 201, and the repair agent is filled in the flexible tube 213.

[0063] Specifically, the flexible tube 213 is a microvascular structure like capillaries embedded in the repair plate 211. The interior of the flexible tube 213 is filled with the repair agent. When the repair plate 211 is damaged such as cracked, the repair agent in the damaged part of the flexible tube 213 will be released to repair the damaged part. Due to the connection of the internal network of the flexible tube 213, the repair agent in other parts can also reach the damaged part through the network, thereby realizing the self - repair of the damaged material.

[0064] To achieve multiple self - repairs of the repair layer 200, at least one port of the flexible tube 213 penetrates through the edge of the repair plate 211 and communicates with the outside. The port of the flexible tube 213 described above can form an addition port for the repair agent. When the repair agent in the network is exhausted, manual addition can be carried out, thereby further enhancing the service life of the self - repair bottom guard plate.

[0065] Exemplarily, the flexible tube body 213 may include one or more tubes. The flexible tube body 213 may be disposed in the repair plate 211 in a coiled, bent, or other manner, or may be distributed in the repair plate 211 in a wound and staggered manner.

[0066] In the case where the flexible pipe body 213 includes multiple pieces, the multiple flexible pipe bodies 213 are interconnected, and each flexible pipe body 213 has a port penetrating the edge of the repair plate 211 to facilitate timely addition of the repair agent.

[0067] It should also be noted that the diameter of the capsule structure 212 can be between 10 nm and 1000 μm, the inner diameter of the flexible tube 213 can be between 1 μm and 1 mm; and the thickness of the repair layer 200 can be between 1 mm and 3 mm.

[0068] Of course, in other embodiments, the flexible inclusions and the repair agents may not be provided in the repair layer 200, and the repair layer 200 may use intrinsic self-healing materials, that is, no additional repair agents, catalysts, etc. are needed. When the repair layer 200 is damaged by a certain degree of external force, the self-healing of the composite material is achieved in the absence of external energy or force through the inherent reversibility of chemical bonds and the physical interaction between damaged interfaces (mainly including self-healing polymer materials with reversible covalent bonds such as acylhydra bonds, disulfide bonds, DA reactions, NO bonds, etc., and reversible non-covalent bonds such as hydrogen bonds, metal coordination bonds, ionic interactions, superhydrophobic effects, etc.).

[0069] Furthermore, if Figure 2 and Figure 3 As shown, in some embodiments, the bottom guard plate 10 further includes a foaming layer 300, which is disposed on the side of the repair layer 200 away from the reinforcing layer 100. The foaming layer 300 can play the role of shock absorption, buffering, energy absorption and heat insulation to enhance the strength of the bottom guard plate 10.

[0070] It should also be noted that if Figure 3 As shown, in some embodiments, the bottom guard plate may further include a protective layer 400 , and the protective layer 400 covers the surface of the repair layer 200 facing away from the reinforcement layer 100 .

[0071] Specifically, the protective layer 400 may include a first protective layer 410 and a second protective layer 420 . The first protective layer 410 covers the first surface of the repair layer 200 , and the second protective layer 420 covers the second surface of the repair layer 200 , thereby protecting the repair layer 200 .

[0072] Exemplarily, the material of the protection layer 400 may be glass fiber material, which has the characteristics of light weight and high mechanical strength, and thus can play a protective role for the repair layer 200 .

[0073] It should be noted that the reinforcement layer 100 and the repair layer 200 can be fixed by fasteners. The repair layer 200 and the protection layer 400 can be fixed by adhesion, or the reinforcement layer 100, the repair layer 200 and the protection layer 400 can be fixed together by fasteners. The foam layer 300 can be fixed to the protection layer 400 by adhesion, or the foam layer 300, the protection layer 400, the repair layer 200 and the reinforcement layer 100 can be fixed together by fasteners.

[0074] The embodiment of the present application also provides a battery pack, including the above bottom guard plate. In view of the fact that in this embodiment, the battery pack includes the bottom guard plate of any of the above embodiments, the battery pack with the bottom guard plate also has the beneficial effects of the above bottom guard plate, and will not be elaborated herein again.

[0075] The embodiment of the present application also provides an electrical device, including the battery pack described in any of the above embodiments, and the battery pack is used to provide electrical energy for the electrical device.

[0076] The electrical device in the embodiment of the present application can be a vehicle. For example, the vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. Correspondingly, the electrical device can be a driving mechanism of the vehicle or a control system of the vehicle.

[0077] In addition, the electrical device can also be other energy storage devices, such as portable devices, laptop computers, electric toys, electric tools, ships and spacecrafts, etc. Among them, the spacecraft can include airplanes, rockets, space shuttles or spaceships.

[0078] In view of the fact that the electrical device in this embodiment includes the battery pack described in any of the above embodiments, therefore, the electrical device includes the battery pack structure and beneficial effects, and will not be elaborated herein again.

[0079] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, or an indirect connection through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0080] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0081] The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0082] In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A bottom guard plate, characterized in that, include: A reinforcement layer (100); A repair layer (200) covers at least a portion of the reinforcing layer (100), wherein a closed accommodating cavity (201) is provided in the repair layer (200), wherein the accommodating cavity (201) is filled with a repair agent, and when the repair layer (200) is broken, the repair agent in the accommodating cavity (201) leaks out to seal the cracks in the repair layer (200).

2. The bottom guard plate according to claim 1, wherein The repair layer (200) comprises a repair plate (211) and a flexible enclosure arranged in the repair plate (211); the inner cavity of the flexible enclosure forms the accommodating cavity (201); when the repair plate (211) ruptures, the flexible enclosure ruptures along with the repair plate (211), and the repair agent in the flexible enclosure leaks out to seal the cracks in the repair plate (211).

3. The bottom guard plate according to claim 2, characterized in that, The flexible enclosure includes a capsule structure (212), the capsule structure (212) is dispersedly arranged in the repair plate (211), the inner cavity of the capsule structure (212) forms the accommodating cavity (201), and the repair agent is encapsulated in the capsule structure (212).

4. The bottom guard plate according to claim 2, characterized in that, The flexible enclosure comprises a flexible tube body (213), the accommodating cavity (201) is formed inside the flexible tube body (213), and the repair agent is filled in the flexible tube body (213).

5. The bottom guard plate according to claim 4, wherein At least one port of the flexible pipe body (213) is disposed through the edge of the repair plate (211) and is in communication with the outside.

6. The bottom guard plate according to claim 5, characterized in that, The flexible pipe body (213) comprises a plurality of flexible pipe bodies (213), and the plurality of flexible pipe bodies (213) are interconnected.

7. The bottom guard plate according to any one of claims 1 to 6, characterized in that, A catalyst is also provided in the repair layer (200); when the repair agent leaks out, the repair agent reacts with the catalyst to form a plugging material, thereby plugging the cracks in the repair layer (200).

8. The bottom guard plate according to any one of claims 1 to 6, characterized in that The repair layer (200) is wrapped around the outer side of the reinforcement layer (100).

9. The bottom guard plate according to claim 8, characterized in that, The repair layer (200) comprises a first repair layer (210) and a second repair layer (220); the reinforcing layer (100) comprises a first surface and a second surface arranged opposite to each other in a thickness direction; the first repair layer (210) and the second repair layer (220) are arranged on both sides of the reinforcing layer (100) in the thickness direction of the reinforcing layer (100); The orthographic projection of the first repair layer (210) on the surface where the first surface is located covers the first surface; and / or the orthographic projection of the second repair layer (220) on the surface where the second surface is located covers the second surface.

10. The bottom guard plate according to claim 8, characterized in that, The bottom guard plate further comprises a foaming layer (300), wherein the foaming layer (300) is arranged on a side of the repair layer (200) facing away from the reinforcing layer (100).

11. The bottom guard plate according to claim 10, wherein, The bottom guard plate further comprises a protective layer (400), wherein the protective layer (400) covers the surface of the repair layer (200) which faces away from the reinforcement layer (100).

12. The underbody panel according to claim 11, wherein, The material of the protective layer (400) is glass fiber; And / or, the reinforcement layer (100) is made of metal.

13. A battery pack, characterized in that, Comprising the bottom guard plate described in any one of claims 1 to 12.

14. An electrical device, characterized in that, Including the battery pack as claimed in claim 13.

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