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, the battery pack bottom protection plate comprises at least one metal plate, the metal plate is provided with a plurality of lightening holes, and at least one side of the metal plate is provided with a plurality of convex ribs. According to the battery pack bottom protection plate, the weight of the metal plate is reduced by forming the lightening holes in the metal plate, so that the overall weight of the battery pack bottom protection plate is reduced; by arranging a plurality of convex ribs, the strength of the metal plate is improved, the strength of the metal plate is prevented from being reduced after the metal plate is perforated, and the protection effect of the battery pack bottom protection plate is ensured.

Description

Technical Field

[0001] The present application relates to vehicle manufacturing technology, and in particular to a battery pack bottom guard plate, a battery pack and electrical equipment. Background Art

[0002] The battery pack bottom guard plate is installed at the bottom of the battery pack (i.e. the side of the battery pack facing the ground). It mainly protects the bottom of the battery pack from external impact and damage, prevents damage to the internal structure of the battery pack, and improves the safety of the battery pack.

[0003] In related art solutions, the battery pack bottom guard plate is lined with a metal plate (e.g., steel plate) to improve its structural strength. However, the metal plate makes the overall weight of the battery pack bottom guard plate heavier, thereby reducing the energy density of the battery pack. Utility Model Content

[0004] In order to overcome the above-mentioned defects in the related art, the purpose of this application is to provide a battery pack bottom guard plate, a battery pack and an electrical equipment. This application can reduce the weight of the battery pack bottom guard plate, thereby improving the energy density of the battery pack.

[0005] On the one hand, the present application provides a battery pack bottom guard plate, comprising at least one metal plate, wherein the metal plate is provided with a plurality of weight-reducing holes, and at least one side of the metal plate is provided with a plurality of ribs.

[0006] In a possible implementation, the plurality of convex ribs correspond one-to-one to the plurality of weight-reducing holes, and the convex ribs are arranged around the corresponding weight-reducing holes.

[0007] In a possible implementation, the plurality of ribs are integrally formed with the metal plate.

[0008] In a possible implementation, the diameter of the weight-reducing holes is 16-18 mm, and the distance between two adjacent weight-reducing holes is 25-35 mm.

[0009] In a possible implementation, the thickness of the metal plate is 1-2 mm; the height of the rib is 1-2 mm.

[0010] In a possible implementation, the metal plate includes a steel plate or an aluminum alloy plate, and the metal plate is punched to form the weight-reducing holes and the ribs.

[0011] In a possible implementation, the device further includes a first insulating layer, a buffer layer, and a second insulating layer. The metal plate is embedded in the buffer layer. The first insulating layer and the second insulating layer are respectively located on opposite sides of the buffer layer.

[0012] In a possible implementation, the first insulating layer includes a glass fiber composite material layer, the buffer layer includes a composite layer formed by honeycomb aluminum, polyester fiber and polyurethane foam material, and the second insulating layer includes a glass fiber composite material layer.

[0013] On the other hand, the present application provides a battery pack, including a tray, the bottom surface of which is provided with any of the battery pack bottom guard plates described above.

[0014] On the other hand, the present application provides an electric device, including an electric device and the battery pack as described above, wherein the battery pack is used to supply power to the electric device.

[0015] The present application provides a battery pack bottom guard plate, a battery pack, and an electrical device. The battery pack bottom guard plate comprises at least one metal plate having multiple weight-reducing holes and multiple ribs on at least one side of the metal plate. The present application reduces the weight of the metal plate by providing multiple weight-reducing holes, thereby reducing the overall weight of the battery pack bottom guard plate. Furthermore, the multiple ribs improve the strength of the metal plate, preventing strength loss after the holes are opened, thereby ensuring the protective effect of the battery pack bottom guard plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following is a brief introduction to the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 A simplified structural diagram of a battery pack bottom guard plate provided in one embodiment of the present application;

[0018] Figure 2 An exploded view of a battery pack bottom guard plate provided in one embodiment of the present application;

[0019] Figure 3 A simplified structural diagram of a metal plate provided in one embodiment of the present application;

[0020] Figure 4 for Figure 3 Middle AA section view;

[0021] Figure 5 for Figure 1 Middle BB cross-section view.

[0022] Reference numerals:

[0023] 10-battery pack bottom guard plate; 11-fixing hole;

[0024] 100-metal plate; 110-weight-reducing hole; 120-convex rib;

[0025] 200-first insulating layer;

[0026] 300-buffer layer;

[0027] 400-Second insulation layer. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0029] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0030] As described in the background, the battery pack bottom guard plate in related art solutions is heavy, which affects the energy density of the battery pack. This problem is caused by the heavy metal plate within the battery pack bottom guard plate, which primarily serves as a protective element and thus affects the overall weight of the battery pack bottom guard plate.

[0031] In view of this, the embodiments of the present application aim to provide a battery pack bottom guard plate, a battery pack, and an electrical device. Without changing the volume of the battery pack bottom guard plate, the weight of the metal plate is reduced by providing multiple weight-reducing holes in the metal plate, thereby reducing the overall weight of the battery pack bottom guard plate. Furthermore, by providing multiple ribs, the strength of the metal plate is increased, preventing strength reduction after the holes are opened, thereby ensuring the protective effect of the battery pack bottom guard plate.

[0032] The contents of the embodiments of the present application will be described in detail below with reference to the accompanying drawings so that those skilled in the art can understand the contents of the present application in more detail.

[0033] Please refer to Figure 1-Figure 5 This embodiment provides a battery pack bottom guard plate 10, including at least one metal plate 100. The specific number of metal plates 100 (two metal plates 100 are shown in the figure) can be determined according to the number of battery modules in the battery pack. The metal plates 100 can be only arranged under the battery modules to provide protection for the battery modules.

[0034] The metal plate 100 is provided with a plurality of weight-reducing holes 110. For example, the weight-reducing holes 110 may be through holes extending through the metal plate 100, or they may be recessed holes formed by removing portions of the metal plate 100. The specific structure of the weight-reducing holes 110 may be configured according to actual needs. In this embodiment, a through-hole structure may be selected to reduce processing difficulty. The shape of the weight-reducing holes 110 is not limited in this embodiment. The weight-reducing holes 110 may be circular, square, or triangular, and may be configured as required. It is understood that by providing the weight-reducing holes 110, portions of the metal plate 100 may be removed, thereby reducing the weight of the metal plate 100 and making the entire battery pack bottom guard plate 10 lighter. Furthermore, when an external object impacts the weight-reducing hole 110, the impact stress may diffuse to the metal plate 100 on both sides of the weight-reducing hole 110, thereby enhancing the propagation efficiency of the stress wave and improving the protective capability of the battery pack bottom guard plate 10.

[0035] In this embodiment, at least one side of the metal plate 100 is further provided with a plurality of ribs 120. The ribs 120 can be provided on the side of the metal plate 100 facing the ground or on the side facing the electrical equipment, and can be provided as needed. For example, the ribs 120 can be a convex structure provided on the metal plate 100; or, the ribs 120 can extend a certain length along the surface of the metal plate 100 to form a strip structure; the specific structure of the ribs 120 can also be provided according to actual needs. In this embodiment, a convex structure can be selected. It is understood that by providing the ribs 120, the strength of the metal plate 100 can be increased, thereby avoiding a reduction in strength after the metal plate 100 is opened, and ensuring the protective effect of the battery pack bottom guard plate 10.

[0036] From the above description, it can be seen that this embodiment can reduce the weight of the metal plate 100 by providing a plurality of weight-reducing holes 110 on the metal plate 100 without changing the volume of the battery pack bottom guard plate 10, thereby reducing the overall weight of the battery pack bottom guard plate 10; and by providing a plurality of ribs 120, the strength of the metal plate 100 is improved to avoid the reduction in strength after the metal plate 100 is opened with holes, thereby ensuring the protective effect of the battery pack bottom guard plate 10.

[0037] Please continue to refer to Figure 2-Figure 4 In one possible embodiment, the plurality of ribs 120 of this embodiment correspond one-to-one with the plurality of weight-reducing holes 110, and the ribs 120 are disposed around the corresponding weight-reducing holes 110. Specifically, after the weight-reducing holes 110 are disposed on the metal plate 100, the strength of the metal plate 100 surrounding the weight-reducing holes 110 is significantly reduced. Providing the ribs 120 around the corresponding weight-reducing holes 110 can improve the strength of the metal plate 100 surrounding the weight-reducing holes 110, thereby compensating for the lack of strength around the weight-reducing holes 110 after the holes are opened.

[0038] Furthermore, the plurality of ribs 120 and the metal plate 100 in this embodiment can be processed in an integrally formed manner, thereby improving the production efficiency of the battery pack bottom guard plate 10 .

[0039] Optionally, the metal plate 100 of this embodiment can be a steel plate or an aluminum alloy plate, and the metal plate 100 is stamped to form the weight-reducing holes 110 and the ribs 120. Specifically, during preparation, a depression can be first stamped into the metal plate 100, and then the bottom of the depression can be partially cut away using a milling machine or other equipment, thereby integrally forming the weight-reducing holes 110 and the ribs 120, thereby improving the production efficiency of the battery pack bottom guard plate 10.

[0040] Please continue to refer to Figure 3 and Figure 4 , the aperture R of the weight-reducing hole 110 of this embodiment is 16-18mm. The aperture R of the weight-reducing hole 110 can be obtained based on the ball impact test of the battery pack bottom guard plate industry (a steel ball with a diameter of 25mm, a weight of 10kg, and an impact speed of 5m / s impacts the battery pack bottom guard plate 10, and the deformation of the battery pack bottom guard plate 10 in the vertical direction must be less than or equal to 4mm). Through experiments, it was found that when the aperture of the weight-reducing hole 110 is less than 16mm, the degree of weight reduction of the metal plate 100 is relatively weak, and the contribution to the lightweighting of the battery pack bottom guard plate 10 is relatively low. When the aperture of the weight-reducing hole 110 is greater than 18mm, it may cause the deformation of the battery pack bottom guard plate 10 in the vertical direction to be greater than 4mm, thereby failing to meet industry standards.

[0041] In this embodiment, the spacing L between two adjacent weight-reducing holes 110 is 25-35 mm. By limiting the spacing between two adjacent weight-reducing holes 110, the density of openings on the metal plate 100 can be ensured to be within a reasonable range, thereby avoiding excessive openings affecting the strength of the metal plate 100 itself.

[0042] Furthermore, in this embodiment, the thickness D of the metal plate 100 is 1-2 mm, and the height H of the rib 120 is 1-2 mm, that is, the height of the rib 120 after stamping and cutting is substantially the same as the thickness of the metal plate 100 itself.

[0043] Table 1 Specific data of different metal plates

[0044]

[0045] In Table 1, “unoptimized” means that there are no weight-reducing holes and ribs on the metal plate; the unit stiffness refers to the stiffness perpendicular to the direction of the metal plate.

[0046] Table 1 shows that when only weight-reducing holes are provided on the metal plate, the weight of the metal plate decreases as the hole diameter increases, and the lightweighting ratio increases. However, the unit stiffness of the metal plate decreases, failing to meet the protection requirements of the battery pack bottom guard plate. However, when both weight-reducing holes and ribs are provided on the metal plate, the weight of the metal plate decreases as the hole diameter increases, and the lightweighting ratio increases. The unit stiffness of the metal plate also significantly increases compared to the unoptimized control, meeting the protection requirements of the battery pack bottom guard plate.

[0047] According to Table 1, when the lightweight ratio of the metal plate is greater than 30% and the unit stiffness of the metal plate is 5 times greater than that of the non-optimized metal plate, the diameter of the weight-reducing hole is 16-18 mm.

[0048] Please continue to refer to Figure 1 、 Figure 2 and Figure 5 The battery pack bottom guard plate 10 of this embodiment also includes a first insulating layer 200, a buffer layer 300 and a second insulating layer 400. The metal plate 100 is embedded in the buffer layer 300, and the first insulating layer 200 and the second insulating layer 400 are respectively located on opposite sides of the buffer layer 300.

[0049] Specifically, the first insulating layer 200 includes a glass fiber composite material layer. The buffer layer 300 includes a composite layer formed by honeycomb aluminum, polyester fiber and polyurethane foam material. The second insulating layer 400 includes a glass fiber composite material layer. The first insulating layer 200, the buffer layer 300, the second insulating layer 400 and the metal plate 100 can be processed into one piece by a press process. For example, the first insulating layer 200, the buffer layer 300, the metal plate 100 and the second insulating layer 400 can be stacked in sequence, and then a layer of glue is provided on the surface of the first insulating layer 200 facing the buffer layer 300 and the surface of the second insulating layer 400 facing the buffer layer 300. Finally, the first insulating layer 200, the buffer layer 300, the metal plate 100 and the second insulating layer 400 are pressed together into one piece by a hot pressing process, and the metal plate 100 is embedded in the buffer layer 300.

[0050] In addition, this embodiment further improves the protection capability of the battery pack bottom guard plate 10 by providing a rib 120 and positioning it in the buffer layer 300 .

[0051] In this embodiment, the first insulating layer 200, the buffer layer 300, the metal plate 100 and the second insulating layer 400 form a "sandwich structure" to further improve the absorption energy of the battery pack bottom guard plate 10 against impact stress. Specifically, the outermost strong first insulating layer 200 and the second insulating layer 400 can reduce the lateral propagation of the impact stress wave. The internal metal plate 100 can limit the vertical propagation of the impact stress wave. Since the buffer layer 300 adopts materials such as honeycomb aluminum, it has a strong deformation ability. When the impact stress wave propagates to the buffer layer 300, the buffer layer 300 is deformed by the propagation of the impact stress wave, absorbs the energy of the impact stress wave, and thus improves the propagation attenuation of the shock stress wave.

[0052] This embodiment further provides a battery pack, including a tray, the bottom surface of which is provided with the battery pack bottom guard plate 10 .

[0053] Specifically, a plurality of mounting grooves for mounting battery modules can be formed on the bottom surface of the tray of this embodiment, and the battery pack bottom guard plate 10 can be installed on the side of the bottom surface of the tray away from the mounting grooves. The number of metal plates 100 in the battery pack bottom guard plate 10 is the same as the number of mounting grooves, and the metal plates 100 correspond to the mounting grooves one by one. The battery pack bottom guard plate 10 can be fixedly connected to the tray by fasteners. For example, a plurality of fixing holes 11 can be provided on the battery pack bottom guard plate 10, and the fasteners are fixedly connected to the tray after passing through the fixing holes 11. The fasteners can be, for example, screws, rivets, etc. Alternatively, the battery pack bottom guard plate 10 can also be connected to the tray by bonding.

[0054] Since the battery pack of this embodiment adopts the above-mentioned battery pack bottom protective plate 10, the overall weight of the battery pack is reduced and the energy density of the battery pack is improved while the battery pack bottom protective plate 10 has a good protective effect.

[0055] This embodiment further provides an electric device, including an electric device and the above-mentioned battery pack, where the battery pack is used to supply power to the electric device.

[0056] Specifically, the electric device may be a new energy vehicle or an energy storage device. Since the electric device uses the above-mentioned battery pack, the overall weight of the electric device can be reduced, which is beneficial to improving the endurance or energy storage capacity of the electric device.

[0057] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying 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 specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0058] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to direct connection or indirect connection through an intermediate medium; they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0059] It should be noted that, in the description of this application, the terms "first" and "second" are used solely to facilitate the description of different components and should not be understood to indicate or imply a sequential relationship, relative importance, or implicitly specify the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one of such features.

[0060] The various embodiments or implementation methods in this application are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0061] In the description of this application, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of this application. In this application, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack bottom guard plate (10), characterized in that: Comprising at least one metal plate (100), the metal plate (100) is provided with a plurality of weight-reducing holes (110), and at least one side of the metal plate (100) is provided with a plurality of ribs (120); The plurality of convex ribs (120) correspond one-to-one to the plurality of weight-reducing holes (110), and the convex ribs (120) are arranged around the corresponding weight-reducing holes (110).

2. The battery pack bottom guard plate (10) according to claim 1, characterized in that: The plurality of convex ribs (120) are integrally formed with the metal plate (100).

3. The battery pack bottom guard plate (10) according to claim 1 or 2, characterized in that: The diameter of the weight-reducing holes (110) is 16-18 mm, and / or the distance between two adjacent weight-reducing holes (110) is 25-35 mm.

4. The battery pack bottom guard plate (10) according to claim 1 or 2, characterized in that: The thickness of the metal plate (100) is 1-2 mm; and / or the height of the rib (120) is 1-2 mm.

5. The battery pack bottom guard plate (10) according to claim 1 or 2, characterized in that: The metal plate (100) comprises a steel plate or an aluminum alloy plate, and the metal plate (100) is punched to form the weight-reducing holes (110) and the convex ribs (120).

6. The battery pack bottom guard plate (10) according to claim 1 or 2, characterized in that: It also includes a first insulating layer (200), a buffer layer (300) and a second insulating layer (400), wherein the metal plate (100) is embedded in the buffer layer (300), and the first insulating layer (200) and the second insulating layer (400) are respectively located on opposite sides of the buffer layer (300).

7. The battery pack bottom guard plate (10) according to claim 6, characterized in that: The first insulating layer (200) comprises a glass fiber composite material layer, the buffer layer (300) comprises a composite layer formed by honeycomb aluminum, polyester fiber and polyurethane foam material, and the second insulating layer (400) comprises a glass fiber composite material layer.

8. A battery pack, characterized in that: It comprises a tray, the bottom surface of which is provided with a battery pack bottom guard plate (10) as claimed in any one of claims 1 to 7.

9. An electrical device, characterized in that: The device comprises an electric device and the battery pack as claimed in claim 8, wherein the battery pack is used to supply power to the electric device.

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