A bottom protection plate, battery pack and vehicle

Abstract

The utility model relates to battery technical field discloses a bottom guard board, battery package and vehicle, bottom guard board includes buffer layer, composite layer and metal layer, the composite layer includes base material layer and fibre layer, the base material layer is stacked in one side of buffer layer, the fibre layer is embedded in the base material layer, the metal layer is located in the base material layer. The bottom guard board provided in the application has higher structural strength, can buffer the impact of foreign matter, has better protection effect, and can realize the lightweight design of bottom guard board.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a bottom protection plate, a battery pack, and a vehicle. Background Technology

[0002] With the increasing popularity of new energy vehicles, their safety has become a major challenge for the industry, especially battery safety. The battery pack is typically installed at the bottom of the vehicle, and during driving, it is easily damaged by impacts from road debris, severely affecting vehicle safety.

[0003] To address this, some vehicles now use underbody protection plates installed beneath the battery pack to prevent road debris from directly impacting and damaging it. However, existing underbody protection plates are typically designed with a single structure and a single material, primarily metal. As a result, these plates have low structural strength, are heavy, and only provide limited protection by preventing direct impact from debris, offering only poor protection for the battery pack. Utility Model Content

[0004] This utility model discloses a bottom guard plate, a battery pack, and a vehicle. The bottom guard plate has high structural strength, can buffer the impact of foreign objects, and has a good protective effect. At the same time, it can achieve a lightweight design of the bottom guard plate.

[0005] In a first aspect, this utility model discloses a bottom protection plate, including a buffer layer, a composite layer and a metal layer. The composite layer includes a substrate layer and a fiber layer. The substrate layer is stacked on one side of the buffer layer, the fiber layer is embedded in the substrate layer, and the metal layer is connected to the substrate layer.

[0006] As an optional implementation, in this embodiment of the invention, the metal layer is stacked on the side of the substrate layer opposite to the buffer layer;

[0007] Alternatively, the metal layer is stacked between the substrate layer and the buffer layer;

[0008] Alternatively, the metal layer may be embedded within the substrate layer.

[0009] As an optional implementation, in this embodiment of the present invention, the elongation at break of the metal layer is greater than the elongation at break of the composite layer, and the metal layer is stacked on the side of the substrate layer away from the buffer layer.

[0010] As an optional implementation, in this embodiment of the present invention, the bottom protective plate further includes a reinforcing coating, wherein the reinforcing coating is formed on the surface of the substrate layer, and / or, the reinforcing coating is formed on the surface of the metal layer.

[0011] As an optional implementation, in this embodiment of the present invention, the metal layer is stacked on the side of the substrate layer opposite to the buffer layer, and the bottom protective plate further includes a reinforcing coating;

[0012] The reinforcing coating is formed on the side of the metal layer opposite to the substrate layer;

[0013] And / or, the reinforcing coating is formed on the side of the substrate layer facing the metal layer;

[0014] And / or, the reinforcing coating is formed on the side of the substrate layer facing the buffer layer.

[0015] As an optional implementation, in this embodiment of the present invention, the thickness of the reinforcing coating is d1, where 0.2mm≤d1≤5mm.

[0016] As an optional implementation, in this embodiment of the present invention, the buffer layer includes one of a foam layer and a honeycomb layer, wherein the honeycomb layer has a hollow honeycomb structure.

[0017] As an optional implementation, in this embodiment of the present invention, the buffer layer includes a foam layer and a honeycomb layer. The honeycomb layer has a hollow honeycomb structure and is stacked on one side of the foam layer. The substrate layer is stacked on the side of the honeycomb layer opposite to the foam layer.

[0018] As an optional implementation, in this embodiment of the present invention, the buffer layer includes two foam layers, namely a first foam layer and a second foam layer, wherein the hardness of the second foam layer is less than that of the first foam layer, the second foam layer is stacked on one side of the first foam layer, and the honeycomb layer is stacked on the side of the second foam layer opposite to the first foam layer.

[0019] As an optional implementation, in this embodiment of the present invention, when the buffer layer includes the honeycomb layer, the thickness of the honeycomb layer is d2, where 1mm≤d2≤18mm.

[0020] As an optional implementation, in this embodiment of the present invention, the thickness of the buffer layer is d3, where 1.5mm≤d3≤20mm.

[0021] As an optional implementation, in this embodiment of the present invention, the area of ​​the metal layer is S1, the metal layer is provided with a plurality of weight-reducing holes, the sum of the cross-sectional areas of the plurality of weight-reducing holes is S2, and 0.3S1≤S2≤0.9S1.

[0022] As an optional implementation, in this embodiment of the present invention, the thickness of the metal layer is d4, where 0.5mm≤d4≤5mm.

[0023] Secondly, this utility model discloses a battery pack, including a bottom protective plate as described in the first aspect, wherein the bottom protective plate is disposed at the bottom of the battery pack.

[0024] Thirdly, this utility model discloses a vehicle including the battery pack of the second aspect.

[0025] Compared with the prior art, the embodiments of this utility model have at least the following beneficial effects:

[0026] In this embodiment of the invention, by adding a composite layer on top of the metal layer, with the fiber layer of the composite layer embedded within the substrate layer, the composite layer possesses high structural strength while having a lower density and lighter weight than the metal layer. This improves the structural strength of the bottom protector while achieving a lightweight design. Furthermore, by stacking the substrate layer on one side of the buffer layer, the buffer layer can cushion impacts from foreign objects, reducing the impact force. Therefore, when this bottom protector is applied to a battery pack for protection, it exhibits high structural strength, effectively buffers impacts from foreign objects, provides excellent protection, and achieves a lightweight design. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of a bottom protective plate disclosed in Embodiment 1 of this utility model;

[0029] Figure 2 This is a schematic diagram of the structure of a composite layer disclosed in Embodiment 1 of this utility model;

[0030] Figure 3 This is a schematic diagram of another bottom protective plate disclosed in Embodiment 1 of this utility model;

[0031] Figure 4 This is a schematic diagram of the structure of another bottom protective plate disclosed in Embodiment 1 of this utility model;

[0032] Figure 5 This is a schematic diagram of the structure of a metal layer disclosed in Embodiment 1 of this utility model;

[0033] Figure 6 This is a schematic diagram of the structure of a bottom protective plate with a reinforced coating disclosed in Embodiment 1 of this utility model;

[0034] Figure 7 This is a schematic diagram of the structure of a bottom protective plate (the buffer layer is a foam layer) disclosed in Embodiment 1 of this utility model;

[0035] Figure 8 This is a schematic diagram of the structure of a bottom protective plate (the buffer layer is a honeycomb layer) disclosed in Embodiment 1 of this utility model;

[0036] Figure 9 This is a schematic diagram of the structure of a bottom protective plate (the buffer layer includes a foam layer and a honeycomb layer) disclosed in Embodiment 1 of this utility model;

[0037] Figure 10 This is a schematic diagram of the structure of a bottom protective plate (the buffer layer includes a first foam layer, a second foam layer and a honeycomb layer) disclosed in Embodiment 1 of this utility model;

[0038] Figure 11 This is a schematic diagram of the structure of a battery pack disclosed in Embodiment 2 of this utility model;

[0039] Figure 12 This is a structural schematic diagram of a vehicle disclosed in Embodiment 3 of this utility model;

[0040] Figure 13 This is a simplified structural diagram of a vehicle disclosed in Embodiment 3 of this utility model.

[0041] Explanation of main figure symbols

[0042] 100. Bottom protection plate; 10. Buffer layer; 101. Foam layer; 101a. First foam layer; 101b. Second foam layer; 102. Honeycomb layer; 11. Composite layer; 111. Substrate layer; 112. Fiber layer; 12. Metal layer; 12a. Weight reduction holes; 13. Reinforcing coating; 200. Battery pack; 300. Vehicle. Detailed Implementation

[0043] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0044] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0045] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0046] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0047] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0048] This utility model discloses a bottom guard plate, a battery pack, and a vehicle. The bottom guard plate has high structural strength, can buffer the impact of foreign objects, and has a good protective effect. At the same time, it can achieve a lightweight design of the bottom guard plate.

[0049] Example 1

[0050] Please see Figure 1 and Figure 2 This is a schematic diagram of the structure of a bottom guard plate 100 provided in Embodiment 1 of the present utility model. The bottom guard plate 100 includes a buffer layer 10, a composite layer 11 and a metal layer 12. The composite layer 11 includes a substrate layer 111 and a fiber layer 112. The substrate layer 111 is stacked on one side of the buffer layer 10, the fiber layer 112 is embedded in the substrate layer 111, and the metal layer 12 is connected to the substrate layer 111.

[0051] This embodiment adds a composite layer 11 to the metal layer 12, with the fiber layer 112 of the composite layer 11 embedded within the substrate layer 111. This gives the composite layer 11 higher structural strength while having a lower density and lighter weight than the metal layer 12. This improves the structural strength of the bottom protector 100 while achieving a lightweight design. Furthermore, by stacking the substrate layer 111 on one side of the buffer layer 10, the buffer layer 10 can cushion the impact of foreign objects, reducing the impact force. Therefore, when this bottom protector 100 is applied to a battery pack for protection, it exhibits high structural strength, effectively buffers impacts from foreign objects, provides excellent protection, and achieves a lightweight design.

[0052] When the bottom guard plate 100 is applied to the battery pack to protect the battery pack, the side of the bottom guard plate 100 containing the buffer layer 10 is positioned against the battery pack.

[0053] Optionally, the material of the substrate layer 111 includes one or more of resin, polyurethane, and plastic. Thus, by providing a variety of different materials for the substrate layer 111, the bottom cover 100 can select the material of the substrate layer 111 according to actual needs, thereby meeting different usage requirements.

[0054] Optionally, the material of the fiber layer 112 includes one or more of glass fiber, carbon fiber, and Kevlar fiber. Thus, by providing a variety of different materials for the fiber layer 112, the bottom cover 100 can select the material of the fiber layer 112 according to actual conditions, thereby meeting different usage requirements.

[0055] The composite layer 11 and the metal layer 12 can be bonded together by structural adhesive, or when the substrate layer 111 of the composite layer 11 is made of materials such as resin or polyurethane, it can be bonded to the metal layer 12 by utilizing the adhesive properties of the material itself.

[0056] As an optional implementation, please refer to Figure 1 and Figure 2 The metal layer 12 is stacked on the side of the substrate layer 111 away from the buffer layer 10.

[0057] For example, the elongation at break of the metal layer 12 is greater than that of the composite layer 11. Thus, by stacking the metal layer 12 with a larger elongation at break on the side of the substrate layer 111 away from the buffer layer 10, when the bottom protector 100 is applied to the battery pack to protect the battery pack, the metal layer 12 is located on the outermost layer (farthest from the battery pack). The metal layer 12 has a lower risk of breaking due to direct impact from foreign objects, and the bottom protector 100 has stronger impact resistance.

[0058] As another alternative implementation, please refer to Figure 2 and Figure 3 The metal layer 12 is stacked between the substrate layer 111 and the buffer layer 10.

[0059] As another alternative implementation, please refer to Figure 4 The metal layer 12 is embedded in the substrate layer 111.

[0060] Thus, by providing a variety of different placement positions for the metal layer 12, different positions can be selected to place the metal layer 12 according to the actual situation. This embodiment does not make specific limitations in this regard.

[0061] In some embodiments, please refer to Figure 5 The area of ​​the metal layer 12 is S1. The metal layer 12 is provided with multiple weight reduction holes 12a. The total cross-sectional area of ​​the multiple weight reduction holes 12a is S2, and 0.3S1≤S2≤0.9S2.

[0062] If the total cross-sectional area S2 of the multiple weight-reducing holes 12a is less than the area of ​​the metal layer 12 (0.3S1), then the proportion of the total cross-sectional area S2 of the multiple weight-reducing holes 12a is small, the weight-reduction effect of the weight-reducing holes 12a is poor, and the overall weight of the metal layer 12 is large. If the total cross-sectional area S2 of the multiple weight-reducing holes 12a is greater than the area of ​​the metal layer 12 (0.9S1), then the proportion of the total cross-sectional area S2 of the multiple weight-reducing holes 12a is large, and the overall structural strength of the metal layer 12 is low even though the weight reduction requirement of the metal layer 12 has been met. Therefore, the total cross-sectional area S2 of the multiple weight-reducing holes 12a can be 0.3S1≤S2≤0.9S2. The weight-reduction effect of the weight-reducing holes 12a is better, which can meet the weight reduction requirement of the design, the overall weight of the metal layer 12 is smaller, and the overall structural strength of the metal layer 12 is stronger. This can improve the structural strength of the bottom protective plate 100 while achieving a lightweight design, resulting in better protection.

[0063] Furthermore, the total cross-sectional area S2 of the multiple weight-reducing holes 12a can be 0.3S1, 0.4S1, 0.5S1, 0.6S1, 0.7S1, 0.8S1, 0.9S1, etc., and this embodiment does not make specific limitations on this.

[0064] In some other embodiments, the metal layer 12 can adopt a mesh structure to achieve weight reduction. Different weight reduction methods can be selected according to the actual situation, and this embodiment does not make specific limitations on this.

[0065] For example, please refer again Figure 1 As shown, the thickness of metal layer 12 is d4, 0.5mm≤d4≤5mm.

[0066] If the thickness d4 of the metal layer 12 is less than 0.5 mm, the overall structural strength of the bottom protective plate 100 is low, resulting in poor protective performance. If the thickness d4 of the metal layer 12 is greater than 5 mm, the thickness d4 is large, leading to a heavier metal layer 12 even if the bottom protective plate 100 already meets the design strength requirements, which is detrimental to achieving a lightweight design. Therefore, the thickness d4 of the metal layer 12 can be 0.5 mm ≤ d4 ≤ 5 mm, which satisfies the strength requirements of the bottom protective plate 100 design, resulting in higher structural strength and better protective performance, while simultaneously reducing the weight of the metal layer 12 and achieving a lightweight design for the bottom protective plate 100.

[0067] Furthermore, the thickness d4 of the metal layer 12 can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc., and this embodiment does not make a specific limitation on it.

[0068] Optionally, the material of the metal layer 12 may include one or more of steel, steel alloy, aluminum, and titanium alloy. Thus, by providing a variety of different materials for the metal layer 12, the bottom cover 100 can select the material of the metal layer 12 according to actual conditions, thereby meeting different usage requirements.

[0069] In some embodiments, the bottom protective plate 100 further includes a reinforcing coating 13, which is formed on the surface of the substrate layer 111 and / or on the surface of the metal layer 12. Thus, by forming the reinforcing coating 13, the structural strength of the composite layer 11 and / or the metal layer 12 can be improved, resulting in higher structural strength and better protective effect for the bottom protective plate 100.

[0070] Optionally, the material of the reinforcing coating 13 includes one or more of PVC (Polyvinyl Chloride) and polyurea coating. Thus, by providing a variety of different materials for the reinforcing coating 13, the bottom guard plate 100 can select the material of the reinforcing coating 13 according to actual conditions, thereby meeting different usage requirements.

[0071] It can be understood that this embodiment provides multiple placement positions for the metal layer 12. Depending on the placement position of the metal layer 12, the relative position of the metal layer 12 and the composite layer 11 will be different, and the reinforcing coating 13 will have multiple formation positions. This embodiment does not make specific limitations on this.

[0072] In some embodiments, please refer to Figure 6 The following example illustrates the situation with metal layer 12 stacked on the side of composite layer 11 away from buffer layer 10.

[0073] Optionally, a reinforcing coating 13 is formed on the side of the metal layer 12 facing away from the substrate layer 111. In this way, the reinforcing coating 13 can improve the strength of the metal layer 12.

[0074] Optionally, a reinforcing coating 13 is formed on the side of the substrate layer 111 facing the metal layer 12. In this way, the reinforcing coating 13 can improve the strength of the composite layer 11.

[0075] Optionally, a reinforcing coating 13 is formed on the side of the substrate layer 111 facing the buffer layer 10. In this way, the reinforcing coating 13 can improve the strength of the composite layer 11.

[0076] Thus, the reinforcing coating 13 has three different formation locations, and one or more of these locations can be selected according to the actual situation to meet different application requirements.

[0077] For example, the thickness of the reinforcing coating 13 is d1, where 0.2 mm ≤ d1 ≤ 5 mm.

[0078] If the thickness d1 of the reinforcing coating 13 is less than 0.2 mm, the thickness d1 is relatively small, resulting in a poor improvement in the structural strength of the reinforcing coating 13, lower overall structural strength of the bottom protective plate 100, and poor protective effect. If the thickness d1 of the reinforcing coating 13 is greater than 5 mm, the thickness d1 is relatively large. Given that the bottom protective plate 100 already meets the design strength requirements, the weight of the reinforcing coating 13 is relatively large, which is not conducive to achieving a lightweight design for the bottom protective plate 100. Therefore, the thickness d1 of the reinforcing coating 13 can be 0.2 mm ≤ d1 ≤ 5 mm. This satisfies the strength requirements of the bottom protective plate 100 design, resulting in higher structural strength and better protective effect, while simultaneously reducing the weight of the reinforcing coating 13, thus achieving a lightweight design for the bottom protective plate 100.

[0079] Furthermore, the thickness d1 of the reinforcing coating 13 can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc., and this embodiment does not make specific limitations on it.

[0080] In some embodiments, the buffer layer 10 includes one of a foam layer 101 and a honeycomb layer 102, wherein the honeycomb layer 102 has a hollow honeycomb structure. See also... Figure 7 The buffer layer 10 is designed with a foam layer 101, which utilizes the high elasticity and flexibility of the foam layer 101 material to provide a buffering effect against external forces. Please refer to [link / reference]. Figure 8 The buffer layer 10 adopts a honeycomb layer 102 design, which uses the hollow honeycomb structure to disperse and weaken external forces, so that the buffer layer 10 has the effect of buffering external forces.

[0081] Optionally, the material of the foam layer 101 includes one or more of MPP (Microcellular Polypropylene Foam), EPP (Expanded Polypropylene), EPE (Expanded Polyethylene), and silicone foam. In this way, by providing a variety of different materials for the foam layer 101, the bottom cover 100 can select the material of the foam layer 101 according to actual conditions, thereby meeting different usage requirements.

[0082] Among them, honeycomb structure refers to a porous structure composed of multiple hexagonal, quadrilateral or other shaped pores arranged and combined.

[0083] Optionally, the material of the honeycomb layer 102 includes one or more of metal and plastic materials. In this way, by providing a variety of different materials for the honeycomb layer 102, the bottom cover plate 100 can select the material of the honeycomb layer 102 according to the actual situation, thereby meeting different usage requirements.

[0084] In some embodiments, please refer to Figure 9 The buffer layer 10 includes a foam layer 101 and a honeycomb layer 102. The honeycomb layer 102 is stacked on one side of the foam layer 101, and the substrate layer 111 is stacked on the side of the honeycomb layer 102 opposite to the foam layer 101. In this way, on the one hand, by stacking the foam layer 101 and the honeycomb layer 102, when the buffer layer 10 is subjected to external force, it can provide double buffering, improving the buffering effect of the buffer layer 10. On the other hand, by stacking the substrate layer 111 on the side of the honeycomb layer 102 opposite to the foam layer 101, when the bottom protector 100 is applied to a battery pack to protect it, the softer foam layer 101 can be placed against the battery pack, instead of the harder honeycomb layer 102. This avoids the situation where, when the bottom protector 100 is impacted by foreign objects, the force is transmitted to the honeycomb layer 102, causing hard contact between the honeycomb layer 102 and the battery pack, resulting in abnormal noise.

[0085] In some embodiments, please refer to Figure 10The buffer layer 10 includes two foam layers 101, namely a first foam layer 101a and a second foam layer 101b. The hardness of the second foam layer 101b is less than that of the first foam layer 101a. The second foam layer 101b is stacked on one side of the first foam layer 101a, and the honeycomb layer 102 is stacked on the side of the second foam layer 101b away from the first foam layer 101a. In this way, by stacking the first foam layer 101a, the second foam layer 101b, and the honeycomb layer 102, the buffer layer 10 can provide multiple buffering effects when subjected to external forces, thereby improving the buffering effect of the buffer layer 10. On the other hand, by stacking the second foam layer 101b between the first foam layer 101a and the honeycomb layer 102, the softer second foam layer 101b abuts against the honeycomb layer 102, thereby preventing the bottom guard plate 100 from being impacted by foreign objects, and thus avoiding the situation where the force is transmitted to the honeycomb layer 102, causing hard contact between the honeycomb layer 102 and the foam layer 101, resulting in abnormal noise.

[0086] For example, please refer again Figure 9 When the buffer layer 10 includes the honeycomb layer 102, the thickness of the honeycomb layer 102 is d2, 1mm≤d2≤18mm.

[0087] If the thickness d2 of the honeycomb layer 102 is less than 1 mm, then the thickness d2 of the honeycomb layer 102 is relatively small, resulting in poor overall cushioning effect of the buffer layer 10 and poor protective effect of the bottom protective plate 100. If the thickness d2 of the honeycomb layer 102 is greater than 18 mm, then the thickness d2 of the honeycomb layer 102 is relatively large. Given that the buffer layer 10 already meets the design requirements for cushioning effect, a larger thickness of the buffer layer 10 is not conducive to achieving a thinner and lighter design for the bottom protective plate 100. Therefore, the thickness d2 of the honeycomb layer 102 can be 1 mm ≤ d2 ≤ 18 mm, which can meet the design requirements for the buffer layer 10, resulting in better protective effect of the bottom protective plate 100, while simultaneously reducing the thickness of the buffer layer 10 and achieving a thinner and lighter design for the bottom protective plate 100.

[0088] Furthermore, the thickness d2 of the honeycomb layer 102 can be 1mm, 3mm, 5mm, 7mm, 9mm, 11mm, 13mm, 15mm, 17mm, 18mm, etc., and this embodiment does not make specific limitations on it.

[0089] For example, the thickness of the buffer layer 10 is d3, where 1.5mm ≤ d3 ≤ 20mm.

[0090] If the thickness d3 of the buffer layer 10 is less than 1.5 mm, then the overall buffering effect of the buffer layer 10 is poor, and the protective effect of the bottom protective plate 100 is also poor. If the thickness d3 of the buffer layer 10 is greater than 20 mm, then the thickness d3 of the buffer layer 10 is large. Given that the buffer layer 10 already meets the design requirements for buffering effect, a large thickness of the buffer layer 10 is not conducive to achieving a thinner and lighter design for the bottom protective plate 100. Therefore, the thickness d3 of the buffer layer 10 can be 1.5 mm ≤ d3 ≤ 20 mm, which can meet the design requirements for the buffer layer 10, resulting in better protection for the bottom protective plate 100, while simultaneously reducing the thickness of the buffer layer 10 and achieving a thinner and lighter design for the bottom protective plate 100.

[0091] Furthermore, the thickness d3 of the buffer layer 10 can be 1.5mm, 2mm, 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, etc., and this embodiment does not make specific limitations on it.

[0092] This utility model provides a bottom protection plate 100. By adding a composite layer 11 to the metal layer 12, with the fiber layer 112 of the composite layer 11 embedded within the substrate layer 111, the composite layer 11 has higher structural strength and a lower density than the metal layer 12, resulting in a lighter weight. This improves the structural strength of the bottom protection plate 100 while achieving a lightweight design. Furthermore, by stacking the substrate layer 111 on one side of the buffer layer 10, the buffer layer 10 can cushion the impact of foreign objects, reducing the impact force. Therefore, when this bottom protection plate 100 is applied to a battery pack for protection, it exhibits high structural strength, effectively buffers impacts from foreign objects, provides excellent protection, and achieves a lightweight design.

[0093] Example 2

[0094] Please see Figure 11 This is a schematic diagram of the structure of a battery pack 200 provided in Embodiment 2 of the present utility model. The battery pack 200 includes a bottom protective plate 100 of Embodiment 1, which is disposed at the bottom of the battery pack 200.

[0095] Embodiment 2 of this utility model provides a battery pack 200, which is protected by a bottom protective plate 100 with high structural strength, to prevent foreign objects from directly impacting and bumping the battery pack 200, and can buffer the impact of foreign objects, with better protection effect. At the same time, the lightweight design of the bottom protective plate 100 can reduce the overall weight of the battery pack 200.

[0096] Example 3

[0097] Please see Figure 12and Figure 13 This is a structural schematic diagram of a vehicle 300 provided in Embodiment 3 of the present utility model. The vehicle 300 includes the battery pack 200 of Embodiment 2.

[0098] Embodiment 3 of this utility model provides a vehicle 300, which has better safety.

[0099] The foregoing has provided a detailed description of a bottom guard plate, battery pack, and vehicle disclosed in the embodiments of this utility model. This article uses specific examples to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the bottom guard plate, battery pack, and vehicle of this utility model and its core ideas. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A bottom protective plate, characterized in that, include: Buffer layer; A composite layer comprising a substrate layer and a fiber layer, wherein the substrate layer is stacked on one side of the buffer layer and the fiber layer is embedded within the substrate layer; as well as A metal layer is connected to the substrate layer, the metal layer has a breaking elongation greater than that of the composite layer, the metal layer is stacked on the side of the substrate layer away from the buffer layer, or the metal layer is embedded in the substrate layer.

2. The bottom protective plate according to claim 1, characterized in that, The bottom protective plate also includes a reinforcing coating, wherein the reinforcing coating is formed on the surface of the substrate layer, and / or, the reinforcing coating is formed on the surface of the metal layer.

3. The bottom protective plate according to claim 1, characterized in that, The metal layer is stacked on the side of the substrate layer away from the buffer layer, and the bottom protective plate also includes a reinforcing coating; The reinforcing coating is formed on the side of the metal layer opposite to the substrate layer; And / or, the reinforcing coating is formed on the side of the substrate layer facing the metal layer; And / or, the reinforcing coating is formed on the side of the substrate layer facing the buffer layer.

4. The bottom protective plate according to claim 2 or 3, characterized in that, The thickness of the reinforcing coating is d1, where 0.2mm ≤ d1 ≤ 5mm.

5. The bottom protective plate according to claim 1, characterized in that, The buffer layer includes one of a foam layer and a honeycomb layer, wherein the honeycomb layer has a hollow honeycomb structure.

6. The bottom protective plate according to claim 1, characterized in that, The buffer layer includes a foam layer and a honeycomb layer. The honeycomb layer has a hollow honeycomb structure and is stacked on one side of the foam layer. The substrate layer is stacked on the side of the honeycomb layer opposite to the foam layer.

7. The bottom protective plate according to claim 6, characterized in that, The buffer layer includes two foam layers, namely a first foam layer and a second foam layer. The hardness of the second foam layer is less than that of the first foam layer. The second foam layer is stacked on one side of the first foam layer, and the honeycomb layer is stacked on the side of the second foam layer opposite to the first foam layer.

8. The bottom protective plate according to any one of claims 5 to 7, characterized in that, When the buffer layer includes the honeycomb layer, the thickness of the honeycomb layer is d2, where 1mm ≤ d2 ≤ 18mm.

9. The bottom protective plate according to any one of claims 1 to 3, characterized in that, The thickness of the buffer layer is d3, where 1.5mm ≤ d3 ≤ 20mm.

10. The bottom protective plate according to any one of claims 1 to 3, characterized in that, The area of ​​the metal layer is S1, and the metal layer is provided with a plurality of weight-reducing holes. The total cross-sectional area of ​​the plurality of weight-reducing holes is S2, and 0.3S1≤S2≤0.9S1.

11. The bottom protective plate according to claim 1, characterized in that, The thickness of the metal layer is d4, where 0.5mm ≤ d4 ≤ 5mm.

12. A battery pack, characterized in that, Includes a bottom protective plate as described in any one of claims 1 to 11, wherein the bottom protective plate is disposed at the bottom of the battery pack.

13. A vehicle, characterized in that, Includes the battery pack as described in claim 12.

Images