Battery pack bottom protection plate, battery pack and electric equipment

Abstract

The utility model provides a battery pack bottom protection plate, a battery pack and electric equipment, and particularly relates to the technical field of batteries. The battery pack bottom protection plate comprises a first protection layer, a second protection layer, a metal honeycomb layer and a first coating layer. Wherein the first protective layer is provided with a first face and a second face which are opposite, the second protective layer is located on one side of the first face of the first protective layer, the metal honeycomb layer is located between the first protective layer and the second protective layer, and the first coating layer is arranged on the second face of the first protective layer. The first coating layer comprises one or more of a polyvinyl chloride coating and a polyurea coating. Thus, the first coating layer is arranged to improve the impact resistance and protection performance of the battery pack bottom protection plate, and the integrated sandwich structure formed by the first protection layer, the second protection layer and the metal honeycomb layer can increase the wave impedance ratio and reduce the transmissivity of stress waves at different interfaces, so that the deformation degree of the battery pack is reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery pack bottom protection plate, a battery pack, and an electrical device. Background Technology

[0002] To prevent damage to the battery pack from external forces, a protective plate is usually installed at the bottom of the battery to protect it.

[0003] Existing battery packs employ several protective plate structures, including fiberglass layer-plastic honeycomb layer-steel plate-fiberglass layer, thermoplastic composite layer-steel plate-thermoplastic composite layer, and fiber layer-foam core layer = fiber layer. All of these structures can prevent battery damage from external forces. However, the core layer of current protective plates typically uses cushioning materials such as plastic honeycomb and foam. The core layer has relatively low compressive strength and stiffness, resulting in lower volumetric and mass-to-energy absorption. Therefore, the energy absorption effect of the protective plate still needs improvement, failing to achieve high-energy protection. Furthermore, if the steel plate is too thin, the protective plate has low strength and poor cushioning effect; if the steel plate is too thick, the overall weight of the protective plate is large. Additionally, the protective capabilities of each layer in the protective plate are limited, making it unable to withstand impact loads at different strain rates. Utility Model Content

[0004] This application provides a battery pack bottom protector, a battery pack, and an electrical device. The battery pack bottom protector includes a first protective layer, a second protective layer, a metal honeycomb layer, and a first coating layer. This four-layer structure provides excellent impact resistance, superior high-energy protection, and adaptability to impact loads at different strain rates.

[0005] In a first aspect, embodiments of this application provide a battery pack bottom protection plate, comprising:

[0006] The first protective layer has a first side and a second side;

[0007] The second protective layer is located on one side of the first surface of the first protective layer;

[0008] A metal honeycomb layer is located between the first protective layer and the second protective layer.

[0009] The first coating layer is disposed on the second side of the first protective layer;

[0010] The first coating layer includes one or more of polyvinyl chloride coating and polyurea coating.

[0011] The battery pack bottom protector provided in this embodiment includes a first protective layer, a second protective layer, a metal honeycomb layer, and a first coating layer. The first protective layer has opposing first and second surfaces. The second protective layer is located on one side of the first surface of the first protective layer. The metal honeycomb layer is located between the first and second protective layers. The first coating layer is disposed on the second surface of the first protective layer and includes one or more of polyvinyl chloride coating and polyurea coating. Thus, the first coating layer improves the impact resistance of the battery pack bottom protector. The integrated sandwich structure formed by the first protective layer, the second protective layer, and the metal honeycomb layer increases the wave impedance ratio, reduces the transmittance of stress waves at different interfaces, and thereby reduces the deformation of the battery pack.

[0012] In one possible implementation, the second protective layer protrudes from the first surface of the first protective layer, and at least a portion of the first surface of the second protective layer and the first protective layer form a receiving cavity, in which the metal honeycomb layer is located.

[0013] In one possible implementation, the first side of the first protective layer includes a first region and a second region surrounding the periphery of the first region;

[0014] The second protective layer and the first region of the first protective layer form a receiving cavity.

[0015] In one possible implementation, a second coating layer is also included, which is disposed on the outer surface of the second protective layer.

[0016] In one possible implementation, the orthogonal projection of the first coating layer toward the first protective layer completely covers the second side of the first protective layer.

[0017] In one possible implementation, the second coating layer includes one or more of a polyvinyl chloride coating and a polyurea coating.

[0018] In one possible implementation, the elastic modulus of the first coating layer is in the range of 100-200 MPa;

[0019] And / or, the thickness of the first coating layer ranges from 0.2 to 1.0 mm;

[0020] And / or, the elastic modulus of the second coating layer is in the range of 100-200 MPa.

[0021] And / or, the thickness of the second coating layer ranges from 0.2 to 1.0 mm.

[0022] In one possible implementation, both the first protective layer and the second protective layer comprise one or more of glass fiber and carbon fiber reinforced composite materials.

[0023] In one possible implementation, the thickness of the first protective layer is 1.0-1.2 mm;

[0024] And / or, the thickness of the second protective layer is 1.0-1.2 mm.

[0025] In one possible implementation, the metal honeycomb layer is one or more of aluminum honeycomb layers and magnesium alloy honeycomb layers.

[0026] In one possible implementation, the strength of the metal honeycomb layer ranges from 7 to 13 MPa.

[0027] And / or, the thickness of the metal honeycomb layer is 5-12 mm.

[0028] Secondly, embodiments of this application provide a battery pack, comprising:

[0029] tray,

[0030] A sealing cap, which is connected to the tray to form a cavity;

[0031] The battery module is located inside the cavity;

[0032] And the aforementioned battery pack bottom protector, which is located on the side of the tray facing away from the sealing cover.

[0033] In one possible implementation, a plurality of through holes are provided on the outer periphery of the first surface of the first protective layer of the battery pack bottom cover plate, and the tray is fixedly connected to the battery pack bottom cover plate by fasteners passing through the through holes.

[0034] In one possible implementation, the tray and the battery pack bottom protector are fitted together, and the first coating layer of the battery pack bottom protector is located on the second surface of the first protective layer of the battery pack bottom protector.

[0035] In one possible implementation, there is a gap between the tray and the battery pack bottom protector, and the second coating layer of the battery pack bottom protector is located on the outer surface of the second protective layer of the battery pack bottom protector.

[0036] Thirdly, embodiments of this application provide an electrical device including the aforementioned battery pack.

[0037] It should be understood that the second and third aspects of this application correspond to the technical solutions of the first aspect of this application, and the beneficial effects achieved by each aspect and the corresponding feasible implementation are similar, so they will not be described again.

[0038] In addition to the technical problems solved by this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions as described above, other technical problems solved by the battery pack bottom protection plate, battery pack, and electrical equipment provided by this application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific embodiments. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments of this application or the prior art will be briefly introduced below. Obviously, the drawings described below are only a part of the embodiments of this application. These drawings and text descriptions are not intended to limit the scope of the concept of this application in any way, but to illustrate the concept of this application to those skilled in the art by referring to specific embodiments. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of the structure of the battery pack bottom guard plate provided in the embodiments of this application;

[0041] Figure 2 A cross-sectional view of the bottom protective plate of the battery pack provided in an embodiment of this application;

[0042] Figure 3 A cross-sectional view of the bottom protective plate of the battery pack provided in another embodiment of this application;

[0043] Figure 4 This is a schematic diagram of the battery pack provided in an embodiment of this application.

[0044] Explanation of reference numerals in the attached figures:

[0045] 100-Battery pack bottom protection plate;

[0046] 110 - First protective layer; 111 - First surface; 1111 - First region; 1112 - Second region; 1113 - Through hole; 112 - Second surface;

[0047] 120 - Second protective layer;

[0048] 130 - Metal honeycomb layer;

[0049] 140 - First coating layer;

[0050] 150 - Reception cavity;

[0051] 160 - Second coating layer;

[0052] 200-battery pack;

[0053] 210 - Pallet;

[0054] 220 - Sealing cap;

[0055] 230-Battery Module;

[0056] 240-Cavity. Detailed Implementation

[0057] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0058] First, let me explain the terms used in this application:

[0059] Material wave impedance: One of the important parameters characterizing the mechanical properties of solid materials under dynamic loads. It has the meaning of resistance. Essentially, it is the ratio of the pressure exerted on a certain area when a stress wave propagates in a material medium to the flow rate of particles perpendicularly passing through this area per unit time. Numerically, it is equal to the product of density and wave velocity.

[0060] Plateau stress: Under compressive stress, the stroke of a honeycomb material is relatively long, and there is a long plateau segment on the macroscopic stress-strain curve. The stress value corresponding to this plateau segment is the plateau stress. Plateau stress has a significant impact on the energy absorption capacity of honeycomb materials.

[0061] Stress waves refer to the propagation forms of strain and stress disturbances. When stress and strain have a linear relationship, elastic waves propagate in the medium; when the relationship is nonlinear, they are plastic waves and shock waves.

[0062] Strain rate effect: refers to the rate at which the strain of a material changes with time. The strain rate effect has an important influence on the stress-strain response, strain hardening and energy absorption properties of materials under high load conditions.

[0063] This application provides an electrical device, which includes an electrical component and a battery pack, the battery pack providing electrical energy to the electrical component. For example, the electrical device can be a vehicle or an energy storage device. When the electrical device is a vehicle, the vehicle can be a new energy vehicle, such as a pure electric vehicle (PEV / BEV), a range-extended electric vehicle (REEV), a hybrid electric vehicle (HEV), or a fuel cell electric vehicle. The vehicle can also be any vehicle equipped with a battery.

[0064] Electrical devices can also be electric motors, control systems, lighting systems, etc. When the electrical device is an energy storage device, it can be an inverter, controller, etc. A battery pack can include multiple batteries. In one possible implementation, the batteries can be cylindrical, prismatic, or have several cells inside. Multiple batteries are connected in a specific way and controlled by a control system to store and output electrical energy. The battery pack or individual batteries can provide the electrical energy to the electrical device to meet its normal operation.

[0065] As described in the background section, existing battery pack designs employ several structures for the protective plate, including glass fiber layer-plastic honeycomb layer-steel plate-glass fiber layer, thermoplastic composite layer-steel plate-thermoplastic composite layer, and fiber layer-foam core layer = fiber layer. All of these structures can prevent damage to the battery from external forces. However, the core layer of current protective plates typically uses cushioning materials such as plastic honeycomb and foam. The core layer has relatively low compressive strength and stiffness, resulting in lower volumetric and mass-to-energy absorption. Consequently, the energy absorption effect of the protective plate still needs improvement, failing to achieve high-energy protection. Furthermore, if the steel plate is too thin, the protective plate has low strength and poor cushioning effect; if the steel plate is too thick, the overall weight of the protective plate is large. Moreover, the protective capabilities of each layer in the protective plate are limited, making it unable to withstand impact loads at different strain rates.

[0066] To address the aforementioned technical problems, this application provides a battery pack bottom protector, a battery pack, and an electrical device. The battery pack bottom protector includes a first protective layer, a second protective layer, a metal honeycomb layer, and a first coating layer. The first protective layer has opposing first and second surfaces. The second protective layer is located on one side of the first surface of the first protective layer. The metal honeycomb layer is located between the first and second protective layers. The first coating layer is disposed on the second surface of the first protective layer and includes one or more of polyvinyl chloride coating and polyurea coating. This first coating layer improves the impact resistance of the battery pack bottom protector. The integrated sandwich structure formed by the first protective layer, the second protective layer, and the metal honeycomb layer increases the wave impedance ratio, reduces the transmittance of stress waves at different interfaces, and thus reduces the deformation of the battery pack. The battery pack includes a tray, a sealing cover, a battery module, and the aforementioned battery pack bottom protector. The sealing cover is connected to the tray to form a cavity, the battery module is located within the cavity, and the battery pack bottom protector is located on the side of the tray facing away from the sealing cover. The electrical device includes the aforementioned battery pack.

[0067] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0068] This application provides a battery pack bottom protector, a battery pack, and an electrical device. The battery pack bottom protector consists of four layers, providing excellent impact resistance and high-energy protection, and can withstand impact loads at different strain rates. The specific structures of the battery pack bottom protector, battery pack, and electrical device provided in this application embodiment are described below with reference to the accompanying drawings.

[0069] refer to Figure 1 The first aspect of this application provides a battery pack bottom protector 100. The battery pack bottom protector 100 includes a first protective layer 110, a second protective layer 120, a metal honeycomb layer 130, and a first coating layer 140. In one possible implementation, such as... Figure 2As shown, the first protective layer 110 may have a first surface 111 and a second surface 112, wherein the first surface 111 and the second surface 112 are disposed opposite to each other. It is understood that the second protective layer 120 may be located on one side of the first surface 111 of the first protective layer 110, while the metal honeycomb layer 130 may be located between the first protective layer 110 and the second protective layer 120. Correspondingly, the first coating layer 140 may be disposed on the second surface 112 of the first protective layer 110. The first coating layer 140 has ultra-tough properties, and the first coating layer 140 can be directly sprayed onto the second surface 112 of the first protective layer 110. Exemplarily, the first coating layer 140 may include one or more of polyvinyl chloride coating and polyurea coating; this embodiment of the application is not limited thereto.

[0070] Understandably, the first coating layer 140 possesses superior toughness, which also makes it highly sensitive to strain rates. Thus, at lower strain rates, the first coating layer 140 exhibits high ductility and superelasticity, while at higher strain rates, it transforms into a harder state, significantly increasing its yield strength and tensile strength. Under impact loads, the first coating layer 140 can absorb and release energy through the breaking and recombination of its internal chemical bonds, thereby giving the battery pack 200 protective plate with the first coating layer 140 excellent impact resistance.

[0071] Alternatively, in one possible implementation, the first protective layer 110, the second protective layer 120, and the metal honeycomb layer 130 can form an integrated sandwich structure, thereby constructing a hard-soft combined protective structure. The first and second protective layers 110 and 120 are made of high-strength and lightweight composite materials, forming a hard protective structure. The metal honeycomb layer 130 is made of a material with high compressive strength and strong energy absorption performance, forming a soft protective structure. Thus, the overall structure combining the first protective layer 110, the second protective layer 120, and the metal honeycomb layer 130 can increase the wave impedance ratio, reduce the transmittance of stress waves at different interfaces, and thereby reduce the deformation of the battery pack 200. It is understood that when stress waves travel from a material with high wave impedance (harder material) to a material with low wave impedance (softer material), a larger wave impedance ratio results in lower transmittance, lower transmitted wave intensity, greater impact energy attenuation, and better protection.

[0072] It is understandable that the first protective layer 110, the second protective layer 120 and the metal honeycomb layer 130 can be bonded together by molding to form an integrated sandwich structure, thereby building a protective barrier for the battery pack 200.

[0073] Continue to refer to Figure 2Based on the above embodiments, the second protective layer 120 may protrude from the first surface 111 of the first protective layer 110, and at least a portion of the first surface 111 of the first protective layer 110 may form a receiving cavity 150, thereby allowing the metal honeycomb layer 130 to be located within the receiving cavity 150. In one possible implementation, the protruding portion of the second protective layer 120 may be located at the center of the first surface 111 of the first protective layer 110, thereby allowing the metal honeycomb layer 130 to also be located in the middle.

[0074] Continue to refer to Figure 2 Based on the above embodiments, the first surface 111 of the first protective layer 110 may further include a first region 1111 and a second region 1112. The second region 1112 may surround the outer periphery of the first region 1111. In this embodiment, the second protective layer 120 may form a receiving cavity 150 with the first region 1111 of the first protective layer 110. Thus, the first region 1111 of the first protective layer 110 is located inside the second protective layer 120. The second protective layer 120 may be attached to the second region 1112 of the first protective layer 110 and the outer periphery of the metal honeycomb layer 130, thereby enabling the second protective layer 120 to form a stepped structure. It is understood that the stepped structure facilitates the installation of the battery pack bottom cover 100.

[0075] Continue to refer to Figure 2 Based on the above embodiments, the orthographic projection of the first coating layer 140 toward the first protective layer 110 can completely cover the second surface 112 of the first protective layer 110. By setting the first coating layer 140 to be completely sprayed onto the second surface 112 of the first protective layer 110, the impact resistance of the battery pack bottom guard plate 100 is improved.

[0076] refer to Figure 3 In another possible implementation, the battery pack bottom protector 100 may further include a second coating layer 160. The second coating layer 160 may be disposed on the outer surface of the second protective layer 120. Thus, the second coating layer 160 can be sprayed along the stepped structure formed by the second protective layer 120, thereby achieving protection for the entire battery pack bottom protector 100.

[0077] It is understood that, based on the above embodiments, the second coating layer 160 may, by way of example, include one or more of polyvinyl chloride coating and polyurea coating. This application does not limit the scope of the embodiments described herein.

[0078] Based on the above embodiments, the elastic modulus of the first coating layer 140 can be in the range of 100-200 MPa, and / or the thickness of the first coating layer 140 can be in the range of 0.2-1.0 mm. Correspondingly, and / or, the elastic modulus of the second coating layer 160 can also be in the range of 100-200 MPa, and / or the thickness of the second coating layer 160 can also be in the range of 0.2-1.0 mm. It is understood that if the elastic modulus of the coating layer is too high, the deformation of the coating layer will be significantly reduced, failing to dissipate impact energy, and may even be directly transmitted to the battery pack 200, which is detrimental to the coating layer's protective effect. If the elastic modulus of the coating layer is low, the deformation of the coating layer will increase, and the load-bearing capacity will generally be low, making it unsuitable for structures resisting impact loads. Therefore, under a certain external impact velocity, the performance of the first coating layer 140 and / or the second coating layer 160 with an elastic modulus of 100-200 MPa is superior.

[0079] Understandably, for the battery pack 200, if the coating layer is too thick, the indentation value of the battery pack bottom protector 100 under impact load will be smaller. Furthermore, a thicker coating layer would sacrifice the height space of the battery pack 200, which is detrimental to the overall design. If the coating layer is too thin, its impact resistance will be insufficient, failing to meet the requirements of the battery pack bottom protector 100. Therefore, under a certain external impact velocity, the performance is superior when the thickness of the first coating layer 140 and / or the second coating layer 160 is in the range of 0.2-1.0 mm.

[0080] Based on the above embodiments, the first protective layer 110 and the second protective layer 120 can be made of high-strength, high-impact-toughness composite materials, thereby further absorbing impact energy through the deformation of the first protective layer 110 and the second protective layer 120. Exemplarily, both the first protective layer 110 and the second protective layer 120 can include one or more of glass fiber and carbon fiber reinforced composite materials, and this application embodiment does not impose any limitations.

[0081] Based on the above embodiments, the thickness of the first protective layer 110 can be 1.0-1.2 mm, and / or the thickness of the second protective layer 120 can also be 1.0-1.2 mm. It is understood that since the weight and cost of the first protective layer 110 and the second protective layer 120 account for a relatively high proportion of the overall battery pack bottom cover plate 100, considering both cost and weight, selecting a thickness range of 1.0-1.2 mm for the first protective layer 110 and the second protective layer 120 provides superior performance.

[0082] Based on the above embodiments, the metal honeycomb layer 130 can, by way of example, be one or more of aluminum honeycomb layers and magnesium alloy honeycomb layers. In this embodiment, the metal honeycomb layer 130 is exemplified as an aluminum honeycomb layer. Compared with plastic honeycomb and foam materials in related technologies, aluminum honeycomb layers have technical advantages such as high compressive strength, large plateau stress, and large volumetric energy absorption, which can further improve the protective performance of the battery pack bottom protection plate 100. In addition, compared with steel plate materials in related technologies, aluminum honeycomb layers are usually porous structures with more pores. Therefore, the relative density of aluminum honeycomb layers is low, and the internal pore space is conducive to slowing down heat conduction, which also has certain advantages in terms of heat insulation.

[0083] Based on the above embodiments, the strength range of the metal honeycomb layer 130 can be 7-13 MPa, and / or the thickness range of the metal honeycomb layer 130 can be 5-12 mm. It is understood that the strength of the metal honeycomb layer 130 has a significant impact on the protective effect of the battery pack bottom protector 100. Specifically, increasing the strength of the metal honeycomb layer 130 increases the energy absorption ratio of the honeycomb layer and also increases the impact reaction force of the battery pack bottom protector 100. Therefore, the strength of the metal honeycomb layer 130 needs to be controlled within a reasonable range. In this embodiment, when the strength of the metal honeycomb layer 130 is within the range of 7 MPa-13 MPa, the deformation of the battery pack 200 decreases significantly; excessively high honeycomb strength actually reduces the protective effect of the battery pack 200. Thus, the performance of the metal honeycomb layer 130 with a strength in the range of 7 MPa-13 MPa is superior.

[0084] Understandably, the thickness of the metal honeycomb layer 130 is crucial for improving the protective effect of the battery pack bottom guard plate 100. When the thickness of the protective layer and the coating layer are constant, a larger thickness of the metal honeycomb layer 130 increases its energy absorption ratio, leading to a greater impact reaction force on the battery pack bottom guard plate 100 and a significant reduction in the deformation of the battery pack 200, with a very strong decreasing trend. Therefore, the thickness of the metal honeycomb layer 130 needs to be controlled within a reasonable range. In this embodiment, when the thickness of the metal honeycomb layer 130 is in the range of 5-12 mm, the deformation of the battery pack 200 decreases significantly. A larger thickness of the metal honeycomb layer would sacrifice the space of the battery pack 200 in the height direction, which is detrimental to the overall design of the battery pack 200. Thus, a thickness of 5-12 mm for the metal honeycomb layer 130 provides superior performance.

[0085] refer to Figure 4A second aspect of this application provides a battery pack 200. The battery pack 200 may include a tray 210, a sealing cover 220, a battery module 230, and the aforementioned battery pack bottom protector 100. In one possible embodiment, the sealing cover 220 is fixedly connected to the tray 210, and the sealing cover 220 and the tray 210 can form a cavity 240, within which the battery module 230 can be located. In this embodiment, the battery pack bottom protector 100 can be located on the side of the tray 210 facing away from the sealing cover 220. Thus, the battery pack bottom protector 100 can be located at the bottom of the entire battery pack 200, allowing it to support the battery pack 200 and providing good support and protection.

[0086] Continue to refer to Figure 4 Based on the above embodiments, combined with Figure 2 As can be seen, a through hole 1113 may be formed on the outer periphery of the first surface 111 of the first protective layer 110 of the battery pack bottom cover plate 100, that is, the through hole 1113 is formed on the second region 1112 of the first protective layer 110. In one possible implementation, the number of through holes 1113 can be several, and this application embodiment does not limit it. In this application embodiment, the tray 210 can be fixedly connected to the battery pack bottom cover plate 100 by fasteners passing through the through holes 1113.

[0087] Based on the above embodiments, if the tray 210 and the battery pack bottom cover 100 are fitted together, there is a support between the tray 210 and the battery pack bottom cover 100, thereby allowing the tray 210 and the battery pack bottom cover 100 to come into contact. (See reference...) Figure 2 At this time, the first coating layer 140 of the battery pack bottom protector 100 can be located on the second surface 112 of the first protective layer 110 of the battery pack bottom protector 100. In this way, when there is a support between the tray 210 and the battery pack bottom protector 100, the first coating layer 140 sprayed on the second surface 112 of the first protective layer 110 can have higher compressive deformation and absorb higher elastic deformation energy, and the impact resistance is also better.

[0088] Based on the above embodiments, if there is a gap between the tray 210 and the battery pack bottom cover 100, then there is no support between the tray 210 and the battery pack bottom cover 100, thus creating a gap between the tray 210 and the battery pack bottom cover 100. (See reference...) Figure 3At this time, the second coating layer 160 of the battery pack bottom protector 100 can be located on the outer surface of the second protective layer 120 of the battery pack bottom protector 100. In this way, when there is no support between the tray 210 and the battery pack bottom protector 100, the second coating layer 160 sprayed on the outer surface of the second protective layer 120 of the battery pack bottom protector 100 can have higher compressive deformation and absorb higher elastic deformation energy, and the impact resistance is also better.

[0089] A third aspect of this application provides an electrical device (not shown in the figures). This electrical device may include the battery pack 200 described above.

[0090] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0091] It should be noted that phrases such as "in specific implementations," "in some embodiments," "in this embodiment," and "exemplarily" in the specification indicate that the described embodiments may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0092] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0093] It should be readily understood that “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest manner, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0094] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0095] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A battery pack bottom protective plate (100), characterized in that, include: The first protective layer (110) has a first surface (111) and a second surface (112) opposite to each other. The second protective layer (120) is located on one side of the first surface (111) of the first protective layer (110); A metal honeycomb layer (130) is located between the first protective layer (110) and the second protective layer (120); The first coating layer (140) is disposed on the second side (112) of the first protective layer (110). The first coating layer (140) includes one or more of polyvinyl chloride coating and polyurea coating.

2. The battery pack bottom protective plate (100) according to claim 1, characterized in that, The second protective layer (120) protrudes from the first surface (111) of the first protective layer (110), and at least a portion of the first surface (111) of the second protective layer (120) and the first protective layer (110) form a cavity (150), in which the metal honeycomb layer (130) is located.

3. The battery pack bottom protective plate (100) according to claim 2, characterized in that, The first surface (111) of the first protective layer (110) includes a first region (1111) and a second region (1112) surrounding the first region (1111). The second protective layer (120) and the first region (1111) of the first protective layer (110) form the receiving cavity (150).

4. The battery pack bottom protective plate (100) according to claim 3, characterized in that, It also includes a second coating layer (160) disposed on the outer surface of the second protective layer (120).

5. The battery pack bottom protective plate (100) according to claim 3, characterized in that, The orthographic projection of the first coating layer (140) toward the first protective layer (110) completely covers the second surface (112) of the first protective layer (110).

6. The battery pack bottom protective plate (100) according to claim 4, characterized in that, The second coating layer (160) includes one or more of polyvinyl chloride coating and polyurea coating.

7. The battery pack bottom protective plate (100) according to claim 4, characterized in that, The elastic modulus of the first coating layer (140) is in the range of 100-200 MPa; And / or, the thickness of the first coating layer (140) ranges from 0.2 to 1.0 mm; And / or, the elastic modulus of the second coating layer (160) is in the range of 100-200 MPa. And / or, the thickness of the second coating layer (160) ranges from 0.2 to 1.0 mm.

8. The battery pack bottom cover plate (100) according to any one of claims 1-5, characterized in that, Both the first protective layer (110) and the second protective layer (120) include one or more of glass fiber and carbon fiber reinforced composite materials.

9. The battery pack bottom cover plate (100) according to any one of claims 1-5, characterized in that, The thickness of the first protective layer (110) is 1.0-1.2 mm; And / or, the thickness of the second protective layer (120) is 1.0-1.2 mm.

10. The battery pack bottom protection plate (100) according to any one of claims 1-5, characterized in that, The metal honeycomb layer (130) is one or more of aluminum honeycomb layer and magnesium alloy honeycomb layer.

11. The battery pack bottom cover plate (100) according to any one of claims 1-5, characterized in that, The strength range of the metal honeycomb layer (130) is 7-13 MPa. And / or, the thickness of the metal honeycomb layer (130) is 5-12 mm.

12. A battery pack (200), characterized in that, include: Tray (210) A sealing cap (220) is connected to the tray (210) to form a cavity (240). A battery module (230) is located within the cavity (240); And the battery pack bottom protector (100) according to any one of claims 1-11, the battery pack bottom protector (100) being located on the side of the tray (210) facing away from the sealing cover (220).

13. The battery pack (200) according to claim 12, characterized in that, The battery pack bottom guard plate (100) has a plurality of through holes (1113) on the outer periphery of the first surface (111) of the first protective layer (110). The tray (210) is fixedly connected to the battery pack bottom guard plate (100) by fasteners passing through the through holes (1113).

14. The battery pack (200) according to claim 13, characterized in that, The tray (210) and the battery pack bottom protector (100) are fitted together, and the first coating layer (140) of the battery pack bottom protector (100) is located on the second side (112) of the first protective layer (110) of the battery pack bottom protector (100).

15. The battery pack (200) according to claim 13, characterized in that, There is a gap between the tray (210) and the battery pack bottom protector (100), and the second coating layer (160) of the battery pack bottom protector (100) is located on the outer surface of the second protective layer (120) of the battery pack bottom protector (100).

16. An electrical appliance, characterized in that, The battery pack (200) includes any one of claims 12-15 above.

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