Protective plate, battery pack shell, battery pack and electric equipment

Abstract

The utility model relates to the technical field of batteries, in particular to a protection plate, a battery pack shell, a battery pack and electric equipment. The protection plate comprises a plastic energy absorption layer; and the brittle energy absorption layer is connected with the plastic energy absorption layer. Due to the influence that force is diffused to the periphery after the fragile energy absorption layer is broken, the transmission range of the force in the fragile energy absorption layer is wider, the energy absorption participation range of the plastic energy absorption layer connected with the fragile energy absorption layer is wider, and therefore the overall anti-impact protection capacity and the overall anti-impact protection capacity of the protection plate are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of protection, in particular to a protection plate, a battery pack shell, a battery pack and an electric equipment. BACKGROUND

[0002] As the main power source of electric vehicles, the requirement for the battery pack in the electric vehicle is also increasing with the continuous development of electric vehicles. The battery pack bottom protection plate, as the bottom of the battery pack, is crucial to the safety and durability of the battery pack and the whole vehicle. For the design of the battery pack bottom protection plate of the electric vehicle, a single flat metal plate is currently used, which uses plastic deformation of the metal structure to absorb energy, and the range of actual energy absorption is small, and the impact protection effect of the bottom protection plate is limited. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the present application provides a protection plate, a battery pack shell, a battery pack and an electric equipment, which can at least expand the range of energy absorption in the protection plate and improve the overall impact protection capability of the protection plate.

[0004] In a first aspect, the present application provides a protection plate, comprising:

[0005] a plastic energy absorption layer; and

[0006] a brittle energy absorption layer, the brittle energy absorption layer being connected with the plastic energy absorption layer.

[0007] In a possible implementation, the brittle energy absorption layer comprises a pre-stressed structure and a brittle energy absorption piece, and the brittle energy absorption piece is connected with the pre-stressed structure.

[0008] In a possible implementation, the pre-stressed structure is a net structure.

[0009] In a possible implementation, the pre-stressed structure is formed by connecting pre-stressed pieces.

[0010] In a possible implementation, the pre-stressed piece is a pre-stressed steel structural piece and / or a pre-stressed steel strand.

[0011] In a possible implementation, the pre-stressed structure is formed by splicing and / or weaving the pre-stressed pieces.

[0012] In a possible implementation, the pre-stressed structure is integrally formed.

[0013] In a possible implementation, the brittle energy absorption piece is filled in the net structure of the pre-stressed structure.

[0014] In a possible implementation, the brittle energy absorption piece is arranged in the gap and / or surface of the pre-stressed structure.

[0015] In a possible implementation, the brittle energy-absorbing member is a toughened glass member and / or a ceramic particle member.

[0016] In a possible implementation, the protective plate further includes a first connecting layer, one side of the first connecting layer being connected to the brittle energy-absorbing layer, and the other side of the first connecting layer being connected to the plastic energy-absorbing layer.

[0017] In a possible implementation, the first connecting layer is a glue layer.

[0018] In a possible implementation, the protective plate further includes a protective fixing layer, the protective fixing layer being connected to the brittle energy-absorbing layer.

[0019] In a possible implementation, the protective fixing layer is connected to the side of the brittle energy-absorbing layer that is away from the plastic energy-absorbing layer.

[0020] In a possible implementation, the material of the protective fixing layer is at least one of PET, PP, and PVC.

[0021] In a possible implementation, the protective plate further includes a second connecting layer, one side of the second connecting layer being connected to the brittle energy-absorbing layer, and the other side of the second connecting layer being connected to the protective fixing layer.

[0022] In a possible implementation, the protective plate further includes a coating layer, the coating layer being arranged on the side of the protective fixing layer that is away from the brittle energy-absorbing layer.

[0023] In a possible implementation, the coating layer is a material layer formed of at least one of a scratch-resistant material, a wear-resistant material, a corrosion-resistant material, and a water-resistance material.

[0024] In a possible implementation, the plastic energy-absorbing layer is made of metal.

[0025] In a possible implementation, the plastic energy-absorbing layer is provided with a reinforcing member.

[0026] In a second aspect, the present application provides a battery pack shell including the protective plate.

[0027] In a third aspect, the present application provides a battery pack including the battery pack shell.

[0028] In a fourth aspect, the present application provides a power consumption device including the battery pack.

[0029] The protective plate, the battery pack shell, the battery pack, and the power consumption device provided in the present application increase a brittle energy-absorbing layer on the basis of a plastic energy-absorbing layer. Due to the influence of the brittle energy-absorbing layer on spreading the force to the periphery after being broken, the range of force transmission in the brittle energy-absorbing layer is wider, and the range of the plastic energy-absorbing layer connected thereto participating in energy absorption is wider, thereby improving the overall energy-absorbing capacity and impact protection capacity of the protective plate. Attached Figure Description

[0030] 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 or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of a protective plate provided in an embodiment of this application;

[0032] Figure 2 for Figure 1 The diagram shows the exploded structure of a protective plate.

[0033] Figure 3 for Figure 2 The diagram shows a structural schematic of the plastic energy-absorbing layer of a protective plate.

[0034] Figure 4 for Figure 2 The diagram shows a structural schematic of a brittle energy-absorbing layer in a protective plate.

[0035] Figure 5 for Figure 4 The diagram shows a partially enlarged structural schematic of part A of a brittle energy-absorbing layer.

[0036] Figure 6 for Figure 2 The diagram shows a structural schematic of the first connecting layer of a protective plate.

[0037] Figure 7 for Figure 2 The diagram shows a structural schematic of the protective fixing layer of a protective plate.

[0038] Figure 8 for Figure 2 The diagram shows a structural schematic of the coating layer of a protective plate.

[0039] Explanation of reference numerals in the attached figures:

[0040] 100-Protective plate; 101-Connecting hole; 102-Fixing hole; 10-Plastic energy-absorbing layer; 20-Brittle energy-absorbing layer; 21-Prestressed structure; 211-Prestressed component; 22-Brittle energy-absorbing component; 30-First connecting layer; 40-Protective fixing layer; 50-Coating layer. Detailed Implementation

[0041] In order to make the objects, technical solutions and advantages of the present application clearer, the following will be combined with the accompanying drawings for the preferred embodiments of the present application to make the technical solutions in the embodiments of the present application more clearly and in more detail. In the drawings, the same or similar notations represent the same or similar components or components with the same or similar functions throughout. The described embodiments are part of the embodiments of the present application, not all the embodiments. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work under the premise of the present application, all belong to the scope of protection of the present application. The embodiments of the present application will be described in detail below with reference to the drawings.

[0042] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixed connection, or indirect connection through an intermediate medium, or internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0044] The terms "first", "second", "third" (if any) in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.

[0045] In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or display including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or displays.

[0046] Battery pack as the main power source of electric vehicles, with the continuous development of electric vehicles, the requirements of battery pack in electric vehicles are also increasing. The battery pack bottom guard plate as the bottom of the battery pack is very important to the safety and durability of the battery pack and the whole vehicle. For the design of the bottom guard plate of the battery pack of the electric vehicle, the current commonly used is a single flat metal plate, which uses plastic deformation of the metal structure to absorb energy, and the range of actual energy absorption is small, and the impact protection effect of the bottom guard plate is limited.

[0047] Therefore, the application provides a protection plate 100, which comprises:

[0048] a plastic energy absorption layer 10;

[0049] a brittle energy absorption layer 20, which is connected with the plastic energy absorption layer 10.

[0050] By adding a brittle energy absorption layer 20 on the basis of the plastic energy absorption layer 10, the brittle energy absorption layer 20 is easy to break after bearing a large external load and needs to absorb a large amount of energy when breaking. Since the brittle energy absorption layer 20 spreads the force to the periphery after breaking, the force is transmitted in a wider range in the brittle energy absorption layer 20, and the plastic energy absorption layer 10 connected therewith also participates in a wider range of energy absorption, thereby improving the energy absorption capacity and impact protection capacity of the overall structure of the protection plate 100.

[0051] The content of the application will be described in detail below with reference to the drawings, so that those skilled in the art can more clearly and detailedly understand the content of the application.

[0052] Figure 1 A structural schematic diagram of a protection plate provided by an embodiment of the application is shown. Figure 2 A Figure 1 An exploded structural schematic diagram of a protection plate is shown. Figure 3 A Figure 2 A structural schematic diagram of a plastic energy absorption layer of a protection plate is shown. Figure 4 A Figure 2 A structural schematic diagram of a brittle energy absorption layer of a protection plate is shown. Figure 5 A Figure 4 A partial enlarged structural schematic diagram of part A of a brittle energy absorption layer is shown. Figure 6 A Figure 2 A structural schematic diagram of a first connecting layer of a protection plate is shown. Figure 7 A Figure 2 A structural schematic diagram of a protection fixing layer of a protection plate is shown. Figure 8 A Figure 2 A structural schematic diagram of a coating layer of a protection plate is shown.

[0053] As Figure 1 and Figure 2As shown in the illustration, an embodiment of this application provides a protective plate 100 for use in a battery pack. It is particularly suitable for use as a bottom protective plate for electric vehicle battery packs.

[0054] The protective plate 100 includes a plastic energy-absorbing layer 10 and a brittle energy-absorbing layer 20. The brittle energy-absorbing layer 20 is connected to the plastic energy-absorbing layer 10. The plastic energy-absorbing layer 10 absorbs energy by undergoing plastic deformation upon impact, thus providing protection. The brittle energy-absorbing layer 20 increases the structural strength and expands the range of energy absorption by the brittle energy-absorbing layer 20 itself and the connected plastic energy-absorbing layer 10, thereby improving the overall energy absorption effect.

[0055] like Figure 3 As shown, the plastic energy-absorbing layer 10 is the bottom layer of the entire structure. Its main function is to absorb the impact force when the impact force is large and other structures in the protective plate 100 (specifically, the brittle energy-absorbing layer 20 and other protective layers set above the plastic energy-absorbing layer 10) cannot completely absorb the impact force. It serves as the last link in the protective plate 100 to absorb the impact force.

[0056] When the impact force transmitted to the plastic energy-absorbing layer 10 is small, that is, when other structures in the protective plate 100 have absorbed most of the impact force, the plastic energy-absorbing layer 10 absorbs the small impact force transmitted by undergoing small plastic deformation.

[0057] When the impact force transmitted to the plastic energy-absorbing layer 10 is large, that is, when other structures in the protective plate 100 cannot absorb most of the impact force, the plastic energy-absorbing layer 10 absorbs the large impact force by undergoing large plastic deformation.

[0058] In one possible implementation, the plastic energy-absorbing layer 10 is made of metal.

[0059] Specifically, there are no restrictions on the material selection for the plastic energy-absorbing layer 10. It can be made of traditional metals or composite materials with high strength and good plasticity, such as AL6061 (6061 aluminum plate), DP590 (high-strength duplex steel), DP780 (high-strength automotive steel material), etc.

[0060] In one possible implementation, the plastic energy-absorbing layer 10 is provided with a reinforcing member. The reinforcing member is used to improve the structural strength of the plastic energy-absorbing layer 10.

[0061] In a possible implementation, the reinforcing member can be integrally formed with the plastic energy-absorbing layer 10, such as by a stamping process, a forging process, or a powder metallurgy process, etc.; or the reinforcing member can be separately assembled with the plastic energy-absorbing layer 10, such as by welding, crimping, etc. to connect the reinforcing member to the plastic energy-absorbing layer 10. The reinforcing member can be arranged on at least one end surface of the plastic energy-absorbing layer 10; and the shape of the reinforcing member can include, but is not limited to, a strip shape or other shaped protrusions, and a combination of different shaped protrusions.

[0062] In a possible implementation, the plastic energy-absorbing layer 10 can have a solid plate structure with or without reinforcing ribs, or a light-weight porous sandwich structure with or without reinforcing ribs (such as a honeycomb sandwich structure, a lattice sandwich structure), and similar composite structures, etc. As long as the plastic energy-absorbing layer 10 has a relatively high strength, and can absorb a relatively large amount of impact force by undergoing a relatively large plastic deformation after being impacted by a relatively large load, the plastic energy-absorbing layer 10 can be used.

[0063] As shown in FIGS. 1, 2, and 3, the brittle energy-absorbing layer 20 can be arranged on the plastic energy-absorbing layer 10. The brittle energy-absorbing layer 20 can be arranged on one or both end surfaces of the plastic energy-absorbing layer 10. Figure 4 and Figure 5 As shown in FIGS. 1, 2, and 3, the brittle energy-absorbing layer 20 can be arranged on the plastic energy-absorbing layer 10. The brittle energy-absorbing layer 20 can be arranged on one or both end surfaces of the plastic energy-absorbing layer 10.

[0064] In a possible implementation, the brittle energy-absorbing layer 20 includes a pre-stressed structure 21 and a brittle energy-absorbing member 22. The brittle energy-absorbing member 22 is connected to the pre-stressed structure 21. The pre-stressed structure 21 is used to provide a higher strength to the overall structure. The brittle energy-absorbing member 22 is used to break after absorbing energy, thereby spreading the force to the periphery and expanding the range of energy absorption.

[0065] In a possible implementation, the pre-stressed structure 21 is a net-like structure. The brittle energy-absorbing member 22 can be arranged in the net-like structure of the pre-stressed structure 21 by filling, etc., such as covering the gaps of the net-like structure, and / or covering the surface of the net-like structure.

[0066] The net-like pre-stressed structure 21 can provide support to the brittle energy-absorbing member 22, making the protective plate 100 more stable as a whole; and on the other hand, the net-like pre-stressed structure 21 can also absorb energy and improve the impact resistance of the structure.

[0067] In other possible implementations, the pre-stressed structure 21 can also be a plate-like structure, with the brittle energy-absorbing member 22 attached to the surface of the plate-like structure, or with holes and slots formed on the plate-like structure, and the brittle energy-absorbing member 22 filled in the openings.

[0068] In other possible implementations, the prestressed structure 21 can also be formed by combining a plate structure and a net structure.

[0069] In one possible implementation, the prestressed structure 21 is formed by connecting prestressed members 211.

[0070] When subjected to external loads, the prestressed members 211 forming the prestressed structure 21 can absorb a certain amount of energy through their internal tension, and can provide higher strength to the overall structure.

[0071] In other possible implementations, the prestressed structure 21 can also be integrally formed.

[0072] Integrally forming means that the initial plate material of the prestressed member 211 or the prestressed structure 21 is directly formed into a whole without additional assembly through a specific manufacturing process, such as plastic injection molding, metal casting, 3D printing, etc.

[0073] Integrally forming can reduce assembly steps, thereby reducing production costs and time. Moreover, since the integrally formed prestressed structure 21 has no joints or connection points, the overall structural strength and durability of the prestressed structure 21 can be improved. At the same time, under certain processes, such as 3D printing, integrally forming allows the prestressed structure 21 to be designed with complex structures, facilitating processing and manufacturing according to requirements.

[0074] In one possible implementation, the prestressed member 211 has a certain tension inside through heat treatment.

[0075] In one possible implementation, the brittle energy-absorbing member 22 is filled in the net structure of the prestressed structure 21.

[0076] In one possible implementation, the brittle energy-absorbing member 22 is filled and covers the gaps and / or surfaces of the prestressed structure 21.

[0077] The brittle energy-absorbing member 22 distributed at the gaps of the prestressed structure 21 can diffuse the force to the periphery after breaking, so that the brittle energy-absorbing layer 20 and the plastic energy-absorbing layer 10 connected thereto participate in a wider range of energy absorption, thereby improving the overall energy-absorbing capacity of the protective plate 100.

[0078] In one possible implementation, the prestressed member 211 is a prestressed steel structure member and / or a prestressed steel strand.

[0079] In one possible implementation, the prestressed structure 21 is formed by splicing and / or weaving the prestressed members 211. The brittle energy-absorbing member 22 covers the gaps and surfaces of the structure.

[0080] Specifically, if the prestressed member 211 is a prestressed steel structural member, the prestressed member 211 can be formed by splicing the prestressed steel structural members. The splicing of the prestressed steel structural members can be performed by welding, bolting, riveting, inserting, sleeving, or gluing, so that the prestressed steel structural members are connected into one body to form the prestressed structure 21.

[0081] If the prestressed member 211 is a prestressed steel strand, the prestressed member 211 can be formed by weaving the prestressed steel strands. The weaving of the prestressed steel strands can be performed by plain weave, twill weave, or mat weave, so that the prestressed steel strands are connected into a mesh structure with holes to form the prestressed structure 21.

[0082] If the prestressed member 211 includes both the prestressed steel structural member and the prestressed steel strand, the prestressed member 211 can be formed by mixing the prestressed steel structural member and the prestressed steel strand. For example, the prestressed structure 21 can be formed by using the prestressed steel structural member on the outside and the prestressed steel strand on the inside, or by using the prestressed steel structural member or the prestressed steel strand in different regions and connecting the prestressed steel structural member and the prestressed steel strand by welding, riveting, or weaving between the different regions. The prestressed member 211 can be formed into a square mesh structure or a circular mesh structure according to the process cost and protection requirements, or can be formed into other mesh structures.

[0083] For example, according to the protection requirements, different sizes of mesh holes can be provided in different regions to provide different degrees of protection.

[0084] According to the protection requirements, the prestressed member 211 with different thicknesses or different materials can be used in different regions of the prestressed structure 21.

[0085] In other possible implementations, the prestressed structure 21 can be formed into a mesh structure or a plate structure by laser cutting, 3D printing, chemical etching, stamping, injection molding, or electroplating deposition.

[0086] In other possible implementations, the prestressed member 211 can be made of synthetic metal, synthetic fiber, or other materials with high structural strength.

[0087] In one possible implementation, the brittle energy-absorbing member 22 is a tempered glass member and / or a ceramic particle member.

[0088] Specifically, the material of the brittle energy-absorbing member 22 is not limited, and the brittle energy-absorbing member 22 can be made of tempered glass or ceramic particles. It is only required that the brittle energy-absorbing member 22 can absorb part of the energy and fully transmit the force, so that more regions of the protection structure are involved in actual energy absorption.

[0089] In one possible implementation, the brittle energy-absorbing member 22 is filled in the gap and surface of the pre-stressed structure 21 through heat treatment.

[0090] Specifically, the filling method of the brittle energy-absorbing member 22 is not limited, and the brittle energy-absorbing member 22 can be in a slurry state with good fluidity and plasticity through high-temperature or heat treatment process, and can be solidified and have uniform stress distribution in the interior through heat treatment or molding process after being filled in the pre-stressed structure 21. As long as the material can meet the above functional requirements, it can be selected as the object.

[0091] By adding a brittle energy-absorbing layer 20 on the basis of the conventional plastic energy-absorbing layer 10, the brittle energy-absorbing layer 20 includes a pre-stressed structure 21 made of a pre-stressed member 211 and a brittle energy-absorbing member 22 filled in the pre-stressed structure 21. The pre-stressed structure 21 made of the pre-stressed member 211 can enhance the strength and stability of the entire structure, and the internal tension of the pre-stressed member 211 can offset part of the stress caused by external load when the structure is subjected to a large impact load. The multi-node connection and multi-directional support of the net structure provide additional rigidity and enhance the overall stability. The net structure can better adapt to thermal expansion and contraction, reducing the influence of thermal stress on the structural integrity.

[0092] The brittle energy-absorbing member 22 distributed in the pre-stressed structure 21 is prone to breakage after bearing a large external load and needs to absorb a large amount of energy when breaking. By using the above characteristics of the brittle energy-absorbing member 22, the brittle energy-absorbing layer 20 itself and the plastic energy-absorbing layer 10 connected thereto can participate in a wider range of energy absorption.

[0093] Due to the influence of the pre-stress in the pre-stressed member 211 and the force diffusion to the periphery after the brittle energy-absorbing member 22 breaks, the force is transmitted in a wider range in the brittle energy-absorbing layer 20, and the plastic energy-absorbing layer 10 connected thereto also participates in a wider range of energy absorption, thereby improving the overall energy-absorbing capacity and impact protection capacity of the structure.

[0094] In the prior art, only the plastic energy-absorbing layer 10 bears the impact, and since the plastic energy-absorbing layer 10 itself cannot effectively diffuse the impact force, most of the impact force is concentrated at the impact point, and therefore the thickness requirement of the plastic energy-absorbing layer 10 is high. By combining the brittle energy-absorbing layer 20 with the plastic energy-absorbing layer 10, the range of the protective plate 100 structure participating in energy absorption is widened, and therefore the energy-absorbing capacity can be improved, thereby reducing the thickness of the plastic energy-absorbing layer 10 under the same protection level.

[0095] And, different functional coatings can be added to meet different protection requirements, so that the battery pack bottom protection structure has strong energy absorption capacity, can fully utilize the energy absorption potential, has multiple different protection functions, and has an advantage in thickness. For example, an anti-corrosion coating, a fireproof coating, an antibacterial coating, an electromagnetic shielding coating, a wear-resistant coating, an insulating coating, etc.

[0096] As shown in Figure 6 In one possible implementation, the protection plate 100 further includes a first connecting layer 30, one side of the first connecting layer 30 being connected with the brittle energy absorption layer 20, and the other side of the first connecting layer 30 being connected with the plastic energy absorption layer 10.

[0097] The first connecting layer 30 is used to connect the brittle energy absorption layer 20 and the plastic energy absorption layer 10.

[0098] When the connection between the plastic energy absorption layer 10 and the brittle energy absorption layer 20 is not tight and falls off, the range of the plastic energy absorption layer 10 participating in energy absorption will be small, and the protection and energy absorption capacity of the structure will decrease sharply. Therefore, the first connecting layer 30 is used to improve the adhesion performance of the brittle energy absorption layer 20 and the plastic energy absorption layer 10, thereby improving the stability of the overall performance of the structure.

[0099] In one possible implementation, the first connecting layer 30 is a glue layer. For example, the first connecting layer 30 can be made of DC201 (two-component epoxy resin glue), 8018 glue (silicone potting glue), etc.

[0100] Specifically, the material of the first connecting layer 30 is not limited, as long as it can bond the brittle energy absorption layer 20 and the plastic energy absorption layer 10, is not easy to fall off, and has certain high and low temperature resistance.

[0101] In one possible implementation, a material that is easy to disassemble under certain conditions can be used to connect the plastic energy absorption layer 10 and other protection layers in the protection plate 100, so that the plastic energy absorption layer 10 and other protection layers can be disassembled. The other protection layers can include, but are not limited to, the brittle energy absorption layer 20, the protection fixing layer 40, and the coating layer 50.

[0102] When the vehicle or other device using the protection plate 100 is subjected to a corresponding impact, the damage is not transmitted to the plastic energy absorption layer 10. Therefore, only the other protection layers with relatively low prices need to be replaced after disassembly by the disassembling material, and the protection plate 100 can continue to be used normally. The relatively expensive plastic energy absorption layer 10 does not need to be replaced, thereby better solving the problem of high maintenance and replacement cost of the protection plate 100.

[0103] As shown in Figure 7 In one possible implementation, the protection plate 100 further includes a protection fixing layer 40, the protection fixing layer 40 being connected with the brittle energy absorption layer 20 or the plastic energy absorption layer 10.

[0104] In a possible implementation, the protective fixing layer 40 is connected to the brittle energy-absorbing layer 20 away from the plastic energy-absorbing layer 10.

[0105] The protective fixing layer 40 is used to connect and fix the brittle energy-absorbing layer 20.

[0106] When the brittle energy-absorbing layer 20 that is more likely to break breaks, small particles and debris formed thereby can fly everywhere, causing safety hazards to people around the vehicle, and being difficult to clean up afterwards. By adding a protective fixing layer 40 on the brittle energy-absorbing layer 20, the brittle energy-absorbing layer 20 can be covered, and the particles or debris formed after the brittle energy-absorbing layer 20 breaks are blocked by the protective fixing layer 40, so that the problem of flying does not occur, thereby reducing unnecessary damage or threats to people or objects around.

[0107] In a possible implementation, the material of the protective fixing layer 40 is at least one of PET (polyethylene terephthalate), PP (polypropylene), and PVC (polyvinyl chloride).

[0108] Specifically, the material of the protective fixing layer 40 is not limited, as long as it has certain toughness and strength, and can connect and fix the brittle energy-absorbing layer 20.

[0109] In a possible implementation, a second connecting layer can also be arranged between the protective fixing layer 40 and the brittle energy-absorbing layer 20, one side of the second connecting layer is connected to the brittle energy-absorbing layer 20, and the other side of the second connecting layer is connected to the protective fixing layer 40.

[0110] When the protective fixing layer 40 itself can play a bonding role, the protective fixing layer 40 has good bonding performance, can adsorb and fix the broken brittle material, the protective fixing layer 40 is directly connected to the brittle energy-absorbing layer 20, and a separate connecting layer does not need to be arranged between the two; when the protective fixing layer 40 itself cannot play a bonding role, a second connecting layer needs to be arranged between the protective fixing layer 40 and the brittle energy-absorbing layer 20 to connect and fix.

[0111] When the protective fixing layer 40 is a PET layer or a PP layer, it cannot play a bonding role itself, and thus a second connecting layer needs to be arranged to connect the protective fixing layer 40 to the brittle energy-absorbing layer 20.

[0112] When the protective fixing layer 40 is a PVC layer, a plasticizer and an adhesive can be added to make the protective fixing layer 40 play a bonding role itself, and thus a separate connecting layer does not need to be arranged between the protective fixing layer 40 and the brittle energy-absorbing layer 20 to connect them.

[0113] In one possible implementation, the protective fixing layer 40 may also be disposed between the brittle energy-absorbing layer 20 and the plastic energy-absorbing layer 10.

[0114] The protective fixing layer 40, located near the plastic energy-absorbing layer 10, prevents particles or debris from flying onto the surface of the plastic energy-absorbing layer 10 after the brittle energy-absorbing layer 20 breaks, thus preventing minor scratches and damage. Simultaneously, the protective fixing layer 40 between the plastic energy-absorbing layer 10 and the brittle energy-absorbing layer 20 also absorbs the impact force diffused from the brittle energy-absorbing layer 20. By connecting the brittle energy-absorbing layer 20 and the plastic energy-absorbing layer 10 with the protective fixing layer 40, the range of energy absorption by the plastic energy-absorbing layer 10 is the same as the range of impact force diffused by the brittle energy-absorbing layer 20, but the impact force received by the plastic energy-absorbing layer 10 is reduced, which helps to improve the energy absorption capacity and impact resistance of the protective plate 100.

[0115] The protective fixing layer 40 can prevent the brittle energy-absorbing layer 20 from cracking when it undergoes a small degree of bending. If it cracks due to a large degree of bending or a large impact, the brittle energy-absorbing layer 20 is fixed in place to prevent the debris generated after the cracking from flying out, so as to prevent the flying debris from affecting the performance of other components of the battery pack or endangering the life and property safety of people around the vehicle.

[0116] like Figure 8 As shown, in one possible implementation, the protective plate further includes a coating layer 50, which is disposed on the side of the protective fixing layer 40 away from the brittle energy-absorbing layer 20.

[0117] Depending on different protection requirements, different materials can be selected for the coating layer 50 to enhance the protective capability of the protective plate 100 in different ways. For example, to improve the corrosion resistance of the protective fixing layer 40, a coating layer 50 with better corrosion resistance can be used; to improve the scratch resistance of the protective fixing layer 40, a coating layer 50 with better scratch resistance can be used. Multiple different materials can also be selected and mixed to form the coating layer 50, thus giving a single coating layer 50 multiple protective properties.

[0118] In one possible implementation, the coating layer 50 has at least one of the following properties: scratch resistance, abrasion resistance, corrosion resistance, and water immersion resistance.

[0119] Specifically, there are no restrictions on the material of the coating layer 50. Appropriate materials can be selected as the coating layer 50 according to different protection requirements, so that it has properties such as wear resistance, corrosion resistance, minor scratch resistance, heat insulation, and heat resistance.

[0120] In a possible implementation, the material of the coating layer 50 can be PVC (polyvinyl chloride), epoxy resin, polyurethane, etc. By using the excellent wear resistance and scratch resistance of these materials, the protective plate 100 can have the functions of scratch resistance, wear resistance, corrosion resistance, and water resistance.

[0121] In a possible implementation, the coating layer 50 can also be multi-layered, thereby playing a more protective role.

[0122] As can be seen on the surface of the protective fixed layer 40, according to requirements, a heat insulation coating layer 50, a heat-resistant coating layer 50, a scratch-resistant coating layer 50, a corrosion-resistant coating layer 50, or a wear-resistant coating layer 50 can be stacked.

[0123] In a possible implementation, the connecting layer can also be multi-layered, and each connecting layer connects two adjacent protective layers.

[0124] As can be seen, in addition to the first connecting layer 30, the protective plate 100 has a plastic energy-absorbing layer 10, a protective fixed layer 40, a brittle energy-absorbing layer 20, a protective fixed layer 40, and a multi-layer coating layer 50 stacked in sequence. The connecting layer can be arranged between any two adjacent layers according to the bonding conditions of different layers, thereby improving the connection strength between the two adjacent layers.

[0125] In a possible implementation, whether a connecting layer is needed between the protective fixed layer 40 and the coating layer 50 needs to be selected according to the material and properties of the coating layer 50 and the coating process. If the coating layer 50 is convenient to directly coat on the protective fixed layer 40, no connecting layer is needed. If the coating layer 50 is not convenient to directly coat on the protective fixed layer 40, a connecting adhesive layer needs to be added between the protective fixed layer 40 and the coating layer 50 to connect and fix.

[0126] In a possible implementation, the protective plate 100 is provided with a connecting hole 101, the connecting hole 101 is arranged around the outer periphery of the protective plate 100, and the connecting hole 101 penetrates the coating layer 50, the protective fixed layer 40, the brittle energy-absorbing layer 20, the first connecting layer 30, and the plastic energy-absorbing layer 10 of the protective plate 100.

[0127] The arrangement of the connecting hole 101 facilitates the connection of the protective plate 100 and the battery pack shell by fasteners such as bolts.

[0128] At the same time, the connecting hole 101 arranged around the protective plate 100 can increase the number of connecting points of the protective plate 100 and the battery pack shell, thereby improving the stability of the connection of the protective plate 100 and the battery pack shell, and in combination with the use of sealing members such as sealing rings, the sealing between the protective plate 100 and the battery pack shell is realized.

[0129] In a possible implementation, the sealing piece is press-fitted between the protective plate 100 and the battery pack shell, thereby improving the sealing performance of the battery pack.

[0130] In a possible implementation, the protective plate 100 is provided with a fixing hole 102. The fixing hole 102 penetrates the coating layer 50, the protective fixing layer 40, the brittle energy-absorbing layer 20, the first connecting layer 30, and the plastic energy-absorbing layer 10 of the protective plate 100.

[0131] The fixing hole 102 is arranged to further improve the stability of the connection between the protective plate 100 and the shell.

[0132] When the protective plate 100 is subjected to slight scratches, the coating layer 50 alone plays a protective role against slight scratches, and the effects of other protective layers are not affected. When the protective plate 100 is subjected to a load that exceeds the load that can be borne by the coating layer 50 alone, the protective fixing layer 40 also plays a protective role against scratches and abrasion together with the coating layer 50. When the protective plate 100 is subjected to a larger load, the brittle energy-absorbing layer 20 also plays a protective role together with the first two protective layers, absorbs more energy by breaking in a larger area, and the protective fixing layer 40 also prevents the fragments formed by the brittle energy-absorbing layer 20 from flying away. When the protective plate 100 is subjected to a larger load, the coating layer 50, the protective fixing layer 40, the brittle energy-absorbing layer 20, the first connecting layer 30, and the plastic energy-absorbing layer 10 jointly play a protective role. At this time, the energy-absorbing effects of the coating layer 50 and the protective fixing layer 40 are weak, and the impact force is mainly absorbed and diffused by the pre-stressed structure 21 and the brittle energy-absorbing piece 22 of the brittle energy-absorbing layer 20, and the plastic energy-absorbing layer 10, thereby making the protective plate 100 have excellent anti-bottom impact and anti-protruding foreign object bumping performance.

[0133] The protective plate 100 in the application has strong energy-absorbing capacity and good comprehensive protection effect. When the coating layer 50, the protective fixing layer 40, and the brittle energy-absorbing layer 20 are sufficient to protect most scratches and bumps of conventional road protruding foreign objects during vehicle driving, only the corresponding protective layer needs to be repaired and replaced after the vehicle is subjected to the corresponding bump, and the vehicle can continue to be used normally, such as only the appearance scratch and the damage of the coating layer 50 and the protective fixing layer 40, the coating layer 50 and the protective fixing layer 40 can be removed and replaced.

[0134] Compared with the plastic energy-absorbing layer 10, the price is relatively low, and the battery pack can continue to have good protection effect without replacing the relatively expensive plastic energy-absorbing layer 10, thereby reducing the maintenance and replacement cost of the bottom guard plate. In addition, with the improvement of the energy-absorbing capacity of each protective layer in the protective plate 100, the thickness of the structure can be designed to be lower than the thickness of the prior art, which will help to improve the ground clearance of the whole vehicle and reduce the problem of thermal runaway caused by the bottom scratching of foreign matters on the road of the electric vehicle.

[0135] The application provides a protective plate 100 including a plastic energy-absorbing layer 10, a brittle energy-absorbing layer 20, a first connecting layer 30, a protective fixing layer 40, and a coating layer 50. The brittle energy-absorbing layer 20 is connected with the plastic energy-absorbing layer 10, and the brittle energy-absorbing layer 20 includes a pre-stressed structure 21 and a brittle energy-absorbing piece 22. The brittle energy-absorbing piece 22 is connected with the pre-stressed structure 21. The first connecting layer 30 is connected with the brittle energy-absorbing layer 20 on one side and connected with the plastic energy-absorbing layer 10 on the other side. The protective fixing layer 40 is connected with the side of the brittle energy-absorbing layer 20 away from the plastic energy-absorbing layer 10. The coating layer 50 is connected with the side of the protective fixing layer 40 away from the brittle energy-absorbing layer 20.

[0136] By adding a brittle energy-absorbing layer 20 on the basis of the plastic energy-absorbing layer 10, the brittle energy-absorbing layer 20 includes a pre-stressed structure 21 and a brittle energy-absorbing piece 22. The pre-stressed structure 21 can enhance the strength and stability of the structure of the brittle energy-absorbing layer 20. The brittle energy-absorbing piece 22 distributed in the pre-stressed structure 21 is easy to break after bearing a large external load and needs to absorb a large amount of energy when breaking. Since the brittle energy-absorbing piece 22 spreads the force to the periphery after breaking, the force is transmitted in a wider range in the brittle energy-absorbing layer 20, and the plastic energy-absorbing layer 10 connected therewith also participates in a wider range of energy absorption, thereby improving the overall energy-absorbing capacity and impact protection capacity of the structure of the protective plate 100. By arranging the first connecting layer 30 between the plastic energy-absorbing layer 10 and the brittle energy-absorbing layer 20, the connection stability between the plastic energy-absorbing layer 10 and the brittle energy-absorbing layer 20 is improved, so that the impact force transmitted in a wider range in the brittle energy-absorbing layer 20 can be transmitted to the plastic energy-absorbing layer 10. At the same time, by adding a protective fixing layer 40 on the brittle energy-absorbing layer 20, the safety hazards caused by small particles and debris formed after the brittle energy-absorbing piece 22 in the brittle energy-absorbing layer 20 breaks can be effectively prevented. Finally, the coating layer 50 arranged on the outermost side of the protective plate 100 can be provided with different functions according to different use scenarios, thereby providing targeted protection.

[0137] In addition, the application also provides a battery pack shell including the protective plate 100.

[0138] The specific structure, working principle and function of the protective plate 100 have been described in detail in the foregoing embodiments, and will not be repeated here.

[0139] The protection plate 100 can be a bottom protection plate of a battery pack shell, and can also be applied to an upper cover, a tray and the like of the battery pack shell.

[0140] For example, a plurality of protection plates 100 are connected to each other to form a battery pack shell; or the protection plate 100 is used as an upper cover of the battery pack shell, and the protection plate 100 is arranged on an opening of a battery pack shell; or the protection plate 100 is directly used as a bottom plate of the battery pack shell, and other parts of the battery pack shell are connected to the protection plate 100, and the like.

[0141] In addition, the application further provides a battery pack comprising the battery pack shell and the battery module.

[0142] In addition, the application further provides a power consumption device comprising the power consumption device and the battery pack described in any of the embodiments, and the battery pack is used to provide electric energy for the power consumption device.

[0143] The specific structure, working principle and function of the battery pack have been described in detail in the foregoing embodiments, and will not be described here.

[0144] The power consumption device in the embodiments of the application can be a vehicle, for example: the vehicle can be 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 power consumption device can include but is not limited to a driving mechanism of the vehicle and a control system of the vehicle.

[0145] In addition, the power consumption device can also be other devices, such as a mobile phone, a portable device, a notebook computer, an electric toy, an electric tool, a ship and a spacecraft, etc., wherein the spacecraft can include an airplane, a rocket, a space shuttle or a spaceship.

[0146] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, and not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application.

Claims

1. A shield plate characterized by, The protective plate (100) comprises: a plastic energy-absorbing layer (10); and a brittle energy-absorbing layer (20) connected with the plastic energy-absorbing layer (10).

2. The guard plate of claim 1, wherein The brittle energy-absorbing layer (20) comprises a pre-stressed structure (21) and a brittle energy-absorbing piece (22) connected with the pre-stressed structure (21).

3. The guard plate of claim 2, wherein The pre-stressed structure (21) is a net structure.

4. The guard plate of claim 2, wherein The pre-stressed structure (21) is formed by connecting pre-stressed pieces (211).

5. The shield of claim 4, wherein, The pre-stressed pieces (211) are pre-stressed steel structural pieces and / or pre-stressed steel strands.

6. The guard plate of claim 4, wherein The pre-stressed structure (21) is formed by splicing and / or weaving the pre-stressed pieces (211).

7. The guard plate of claim 2, wherein The pre-stressed structure (21) is integrally formed.

8. The guard plate of claim 3, wherein The brittle energy-absorbing piece (22) is filled in the net structure of the pre-stressed structure (21).

9. A shield according to any one of claims 2 to 7, wherein, The brittle energy-absorbing piece (22) is arranged in the voids and / or surfaces of the pre-stressed structure (21).

10. A shield according to any one of claims 2 to 7, wherein, The brittle energy-absorbing piece (22) is a tempered glass piece and / or a ceramic particle piece.

11. A shield according to any one of claims 1-7, characterized in that The protective plate (100) further comprises a first connecting layer (30), one side of the first connecting layer (30) being connected with the brittle energy-absorbing layer (20), and the other side of the first connecting layer (30) being connected with the plastic energy-absorbing layer (10).

12. The guard plate of claim 11, wherein, The first connecting layer (30) is a glue layer.

13. The shield of any one of claims 1-7, wherein, The protective plate (100) further comprises a protective fixing layer (40) connected with the brittle energy-absorbing layer (20).

14. The shield of claim 13, wherein, The protective fixing layer (40) is connected to the side of the brittle energy-absorbing layer (20) away from the plastic energy-absorbing layer (10).

15. The shield of claim 13, wherein, The material of the protective fixing layer (40) is at least one of PET, PP, and PVC.

16. The shield of claim 14, wherein, The protective plate (100) further comprises a second connecting layer, one side of the second connecting layer being connected with the brittle energy-absorbing layer (20), and the other side of the second connecting layer being connected with the protective fixing layer (40).

17. The shield of claim 14, wherein, The protective plate (100) further comprises a coating layer (50) arranged on the side of the protective fixing layer (40) away from the brittle energy-absorbing layer (20).

18. The shield of claim 17, wherein, The coating layer (50) is a material layer formed by at least one of scratch-resistant, wear-resistant, corrosion-resistant, and water-resistant materials.

19. The shield of any one of claims 1-7, wherein, The plastic energy-absorbing layer (10) is made of metal.

20. The shield of any one of claims 1-7, wherein, The plastic energy-absorbing layer (10) is provided with a reinforcing piece.

21. A battery pack housing, characterized by, The protective plate (100) comprises any one of claims 1-20.

22. A battery pack, characterized by The battery pack shell comprises claim 21.

23. An electrical device, comprising: The battery pack comprises claim 22.

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