Bottom protection plate, battery pack and vehicle

Abstract

The embodiment of the invention provides a bottom protective plate, a battery pack and a vehicle, and relates to the technical field of battery packs, the bottom protective plate comprises a metal layer and a protective layer, and at least one surface of the metal layer is provided with the protective layer. The protective layer comprises a honeycomb core group and a first shear thickening body, one side of the honeycomb core group is connected with the surface of one side of the metal layer, and the honeycomb core group is filled with the first shear thickening body. According to the bottom protection plate provided by the embodiment of the invention, the shear thickening material and the honeycomb structure are combined to form the composite protection layer, and the shear thickening material can be rapidly hardened under the impact action of external force, so that the impact resistance can be enhanced, and after the external force is eliminated, the shear thickening material recovers the original characteristics, and the service life of the bottom protection plate is prolonged. The continuous damage to the battery pack is reduced, the integrity of the battery pack can be kept under extreme conditions, and battery leakage or short circuit caused by structural deformation or damage is prevented.

Description

Technical Field

[0001] The present application relates to the technical field of battery packs, and in particular to an underbody guard plate, a battery pack and a vehicle. Background Art

[0002] At present, new energy vehicles are powered by battery packs at the bottom of the vehicle body. During driving, stones or sharp objects on the road can easily hit or squeeze the battery pack, damaging it and even causing safety accidents. Therefore, how to effectively improve the impact resistance of the battery pack has become one of the difficulties that new energy vehicle companies need to solve urgently.

[0003] In the related art, a protective plate is usually added to the bottom of the battery pack to avoid or reduce the impact or extrusion caused to the battery pack, so as to improve the impact resistance of the battery pack.

[0004] However, the impact resistance of the existing guard plate structure is still insufficient, and after being hit or squeezed and deformed, the damage to the battery pack is still considerable. Summary of the invention

[0005] Based on this, the present application provides a bottom guard plate, a battery pack and a vehicle to solve the problem that the guard plate at the bottom of the existing vehicle battery pack has insufficient impact resistance and the damage to the battery pack is still significant after being impacted or squeezed and deformed.

[0006] In a first aspect, the present application provides a bottom guard plate for being arranged at the bottom of a battery pack, the bottom guard plate comprising a metal layer and a protective layer, and the protective layer is arranged on at least one surface of the metal layer;

[0007] The protective layer comprises a honeycomb core group and a first shear thickening body, one side of the honeycomb core group is connected to the surface of one side of the metal layer, and the first shear thickening body is filled in the honeycomb core group.

[0008] In a possible implementation, the honeycomb core group includes at least a first honeycomb core and a second honeycomb core, and the first honeycomb core and the second honeycomb core are stacked along a first direction intersecting the metal layer;

[0009] The side of the second honeycomb core facing away from the first honeycomb core is connected to the metal layer. The first honeycomb core and the second honeycomb core both have a plurality of first receiving holes, and the first shear thickening body is filled in each of the first receiving holes.

[0010] In a possible implementation, the diameter of each first receiving hole on the first honeycomb core is larger or smaller than the diameter of each first receiving hole on the second honeycomb core.

[0011] In a possible implementation, the protective layer further includes a first sealing member, which is connected to the first honeycomb core on a side facing away from the metal layer and seals each first receiving hole.

[0012] In a possible implementation, the protection layer is divided into a first protection segment and at least one second protection segment along a second direction parallel to the metal layer;

[0013] The second protection segment is located at one side of the first protection segment, and the thickness of the first protection segment is smaller than the thickness of the second protection segment.

[0014] In a possible implementation manner, a diameter of each first accommodating hole in the first protection segment is smaller than a diameter of each first accommodating hole in the second protection segment.

[0015] In a possible implementation manner, the second protection layer further has a transition section along the second direction, and the transition section connects the first protection section and the second protection section.

[0016] In a possible implementation, the transition section includes a corrugated core group and a second shear thickening body, and one side of the corrugated core group is connected to a portion of the surface of the honeycomb core group in the first protection section facing away from the metal layer;

[0017] The other side of the corrugated core group is connected to the side of the honeycomb core group in the second protection segment facing the first protection segment, and the second shear thickening body is filled in the corrugated core group.

[0018] In a possible implementation, the corrugated core group includes at least a first corrugated core and a second corrugated core, and the first corrugated core and the second corrugated core are stacked along a first direction;

[0019] The first corrugated core and the second corrugated core are each provided with a plurality of second accommodating holes, and the second shear thickening body is filled in each of the second accommodating holes.

[0020] In a possible implementation manner, an extension direction of the first corrugated core is consistent with or intersects with an extension direction of the second corrugated core.

[0021] In a possible implementation, the transition section further includes a second sealing member, which is connected to the corrugated core group on the side away from the metal layer and the second protective section and seals the second receiving hole.

[0022] In a possible implementation, the second sealing member smoothly transitions with the first protection segment and the second protection segment respectively.

[0023] In a second aspect, the present application also provides a battery pack, comprising any bottom guard plate provided in the first aspect.

[0024] In a third aspect, the present application also provides a vehicle, comprising the battery pack provided in the second aspect.

[0025] In the bottom guard plate, battery pack and vehicle provided by the present application, the bottom guard plate is used to be arranged at the bottom of the battery pack, and includes a metal layer and a protective layer. The protective layer is arranged on at least one surface of the metal layer to enhance protection, wherein the protective layer includes a honeycomb core group and a first shear thickening body, and the first shear thickening body is filled in the honeycomb core group by connecting one side of the honeycomb core group to the surface of one side of the metal layer. Therefore, the bottom guard plate provided by the present application forms a composite protective layer by combining a shear thickening material with a honeycomb structure, and the shear thickening material can quickly harden when subjected to external impact, thereby enhancing the impact resistance. After the external force is eliminated, the shear thickening material restores its original properties, reducing the continuous damage to the battery pack, maintaining the integrity of the battery pack under extreme conditions, and preventing battery leakage or short circuit caused by structural deformation or damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 paying creative labor.

[0027] Figure 1 An exploded view of the first bottom guard plate provided in an embodiment of the present application;

[0028] Figure 2 A cross-sectional view of the connection relationship between the first bottom guard plate and the battery tray provided in an embodiment of the present application;

[0029] Figure 3 An exploded view of a second bottom guard plate provided in an embodiment of the present application;

[0030] Figure 4 for Figure 3 A partial enlarged view of the middle A;

[0031] Figure 5 A cross-sectional view of a second bottom guard plate provided in an embodiment of the present application;

[0032] Figure 6 for Figure 5 A partial enlarged view of point B in the middle.

[0033] Reference numerals:

[0034] 10: Battery tray;

[0035] 100: metal layer;

[0036] 200: protective layer;

[0037] 210: honeycomb core group;

[0038] 2101: first receiving hole;

[0039] 211: first honeycomb core;

[0040] 212: second honeycomb core;

[0041] 220: first sealing member;

[0042] 230: first protection stage;

[0043] 240: second protection stage;

[0044] 250: Transition section;

[0045] 2501: second receiving hole;

[0046] 251: corrugated core group;

[0047] 2511: first corrugated core;

[0048] 2512: second corrugated core;

[0049] 252: Second sealing member. DETAILED DESCRIPTION

[0050] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of methods and devices consistent with some aspects of the present application as detailed in the appended claims.

[0051] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0052] As mentioned in the background technology section, the existing protective plate structure used for battery packs includes a foam layer, a metal layer and a glass fiber layer, among which the foam layer mainly plays the role of buffering energy absorption and heat insulation, the metal plate is the main component to resist external mechanical impact, and the glass fiber layer mainly plays a packaging role. Although the foam layer and the steel plate have certain strength and toughness, the impact resistance of this structure is still insufficient. Moreover, after the protective plate is impacted or squeezed and deformed, the damage to the battery pack is still relatively large, which is easy to cause continuous damage to the batteries inside the battery pack, and easily cause the batteries to leak or short-circuit, affecting the integrity of the battery pack.

[0053] In view of the above problems existing in the prior art, the present application provides an underbody guard plate, a battery pack and a vehicle. The underbody guard plate provided by the present application includes a metal layer and a protective layer. The protective layer is provided on at least one surface of the metal layer to enhance the protection, wherein the protective layer includes a honeycomb core group and a first shear thickening body. The first shear thickening body is filled in the honeycomb core group by connecting one side of the honeycomb core group to the surface of one side of the metal layer, that is, by combining the shear thickening material with the honeycomb structure to form a composite protective layer. The shear thickening material can harden rapidly when subjected to external impact, thereby enhancing the impact resistance. After the external force is eliminated, the shear thickening material restores its original properties, reducing the continuous damage to the battery pack, maintaining the integrity of the battery pack under extreme conditions, and preventing battery leakage or short circuit caused by structural deformation or damage.

[0054] The technical solution of the present application is described in detail with specific embodiments below. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0055] First, please refer to Figure 1-Figure 2 As shown, an embodiment of the present application provides a bottom guard plate for being arranged at the bottom of a battery pack. The bottom guard plate includes a metal layer 100 and a protective layer 200 , and the protective layer 200 is arranged on at least one surface of the metal layer 100 .

[0056] The protective layer 200 includes a honeycomb core group 210 and a first shear thickening body. One side of the honeycomb core group 210 is connected to the surface of one side of the metal layer 100 , and the first shear thickening body is filled in the honeycomb core group 210 .

[0057] The metal layer 100 in this embodiment is used to play a basic role in resisting external mechanical impacts. It can be a plate-like structure made of metal such as steel and aluminum alloy. The thickness of the metal layer 100 can be 0.5 mm to 2.5 mm.

[0058] The protective layer 200 is used to be combined with the metal layer 100 to enhance the impact resistance and other capabilities. The protective layer 200 and the metal layer 100 can be connected together by lamination or bonding. The protective layer 200 can be arranged on one side surface of the metal layer 100 or on both side surfaces of the metal layer 100. The thickness of the protective layer 200 can be 3 mm to 10 mm.

[0059] The honeycomb core group 210 may be a single-layer structure or a multi-layer composite structure, and has a plurality of densely arranged honeycomb holes therein, and the shape of the honeycomb holes may be a triangle, a quadrilateral, a hexagon or a polygon.

[0060] The first shear thickening body can be a shear thickening fluid (full name shear thickening fluid, abbreviated as STF) or a shear thickening gel (full name shear thickening gel, abbreviated as STG), wherein the shear thickening fluid is a thixotropic sol composed of dispersed phase particles and a liquid dispersion medium, and there is an obvious hydrogen bond between the dispersed phase particles and the liquid dispersion medium. When the fluid is subjected to high-speed shear, its viscosity will suddenly increase sharply, and even change from liquid to solid or solid-like substance. When the external force is removed, it quickly returns to liquid, showing reversible non-Newtonian fluid behavior.

[0061] Shear thickening glue is a solid organic borosiloxane polymer. Under normal conditions, it is a soft macromolecular viscoelastic solid. Once it is hit quickly by the outside world, its storage modulus and strength increase several times instantly, showing a hard solid state. When the external force disappears, it returns to its original soft state.

[0062] Specifically, if Figure 1 As shown, one side of the honeycomb core group 210 is connected to the metal layer 100, and the first shear thickening body is filled in each honeycomb hole of the honeycomb core group 210. One side of the honeycomb hole opening in the honeycomb core group 210 can be connected and sealed with the metal layer 100, or the honeycomb holes on the side of the honeycomb core group 210 away from the metal layer 100 can also be sealed by other components, and protective layers 200 can be respectively provided on both surfaces of the metal layer 100 to form a composite protective layer, which can be connected to the tray at the bottom of the battery pack.

[0063] It can be understood that, compared with the guard plate structure composed of a foam layer, a metal layer and a glass fiber layer in the prior art, the application of the bottom guard plate in the embodiment of the present application forms a composite protective layer by combining a shear thickening material with a honeycomb structure. The shear thickening material can quickly harden when subjected to external impact, thereby enhancing the impact resistance. After the external force is eliminated, the shear thickening material restores its original properties, reducing the continuous damage to the battery pack, maintaining the integrity of the battery pack under extreme conditions, and preventing battery leakage or short circuit caused by structural deformation or damage.

[0064] Therefore, the bottom guard plate provided in the embodiment of the present application includes a metal layer 100 and a protective layer 200. The protective layer 200 is provided on at least one surface of the metal layer 100 to enhance protection, wherein the protective layer 200 includes a honeycomb core group 210 and a first shear thickening body. One side of the honeycomb core group 210 is connected to the surface of one side of the metal layer 100, and the first shear thickening body is filled in the honeycomb core group 210, that is, a composite protective layer is formed by combining a shear thickening material with a honeycomb structure. The shear thickening material can quickly harden when subjected to external impact, thereby enhancing the impact resistance. After the external force is eliminated, the shear thickening material restores its original properties, reduces the continuous damage to the battery pack, maintains the integrity of the battery pack under extreme conditions, and prevents battery leakage or short circuit caused by structural deformation or damage.

[0065] In a possible design, the honeycomb core group 210 includes at least a first honeycomb core 211 and a second honeycomb core 212 , and the first honeycomb core 211 and the second honeycomb core 212 are stacked along a first direction intersecting the metal layer 100 .

[0066] The side of the second honeycomb core 212 facing away from the first honeycomb core 211 is connected to the metal layer 100 . The first honeycomb core 211 and the second honeycomb core 212 both have a plurality of first receiving holes 2101 , and the first shear thickening body is filled in each of the first receiving holes 2101 .

[0067] Specifically, Figure 1 As shown, the first honeycomb core 211 and the second honeycomb core 212 are stacked perpendicular to the direction of the metal layer 100, such as along Figure 1 As shown in the Y-axis direction, the first direction is the direction perpendicular to the metal layer 100. The first honeycomb core 211 and the second honeycomb core 212 both have a plurality of first receiving holes 2101, i.e., honeycomb holes. The first shear thickening body is filled in each of the first receiving holes 2101. The first receiving holes 2101 between the first honeycomb core 211 and the second honeycomb core 212 may be connected or blocked. The first honeycomb core 211 on the side away from the metal layer 100 may be self-sealed, i.e., the first receiving holes 2101 in the first honeycomb core 211 may be open on one side, and the opening faces downward. Of course, the first receiving holes 2101 on the first honeycomb core 211 on the side away from the metal layer 100 may also be sealed by other components.

[0068] In this way, a multi-layer honeycomb core is introduced into the honeycomb structure, each layer of the honeycomb core has a first receiving hole 2101, and the apertures of the first receiving holes 2101 in each layer of the honeycomb core can be different, and the first receiving holes 2101 in each layer of the honeycomb core are filled with the first shear thickening body, so that each layer of the honeycomb core can exhibit different stiffness and strength characteristics.

[0069] Of course, the honeycomb core group 210 can also be arranged in a multi-layer structure. In addition, the first receiving holes 2101 in each layer of honeycomb core can have different shapes (such as triangles, quadrilaterals, hexagons, etc.), sizes and arrangements, and the thickness of each layer of honeycomb core can also be different. In this regard, there are no excessive restrictions in this embodiment.

[0070] Furthermore, in this embodiment, the aperture of each first receiving hole 2101 on the first honeycomb core 211 is larger or smaller than the aperture of each first receiving hole 2101 on the second honeycomb core 212 .

[0071] In one example, the diameter of the first receiving hole 2101 gradually decreases along the first direction (ie, the direction from the external environment to the internal battery tray 10). Figure 1 The middle and upper honeycomb core group 210 is along Figure 1 The positive direction of the Y axis is shown. This composite protective layer structure can provide a gradual dispersion of impact force when subjected to external impact. That is, the larger aperture on the outside can first absorb and disperse part of the impact force, and then as the impact force penetrates deeper, the smaller aperture on the inside can provide denser support to further resist the impact. This design can increase the overall toughness of the bottom guard plate, so that it can better absorb and disperse impact energy when subjected to impact.

[0072] In another example, the aperture of the first receiving hole 2101 gradually increases along the first direction (i.e., the direction from the external environment to the internal battery tray 10), which is not shown in the figure. This composite protective layer structure can have stronger local strength when subjected to external impact. That is, the smaller aperture on the outside can provide a stronger initial resistance, while the gradually increasing aperture on the inside can allow the structure to have a certain deformation space, thereby absorbing more impact energy. This design is more suitable for resisting sharp or locally concentrated impacts.

[0073] Therefore, the arrangement of the first receiving holes 2101 on each honeycomb core in the honeycomb core group 210 can be adjusted according to actual needs, so that each layer can produce the best resistance effect to impact in a specific direction.

[0074] Furthermore, in this embodiment, the protective layer 200 further includes a first sealing member 220 . The first sealing member 220 is connected to the first honeycomb core 211 on the side away from the metal layer 100 , and blocks each of the first receiving holes 2101 .

[0075] In this way, if Figure 1As shown, after each first receiving hole 2101 is filled with the first shear thickening body, it is connected to the first honeycomb core 211 on the side away from the metal layer 100 through the first sealing member 220, and each first receiving hole 2101 is blocked, which is convenient for production and processing. The first sealing member 220 is used to seal the first receiving hole 2101, and it can be a plate-shaped, sheet-shaped structure made of glass fiber material.

[0076] In some embodiments, the protection layer 200 is divided into a first protection segment 230 and at least one second protection segment 240 along a second direction parallel to the metal layer 100 .

[0077] The second protection segment 240 is located at one side of the first protection segment 230 , and the thickness of the first protection segment 230 is smaller than the thickness of the second protection segment 240 .

[0078] In this way, if Figure 3 , Figure 5 As shown, the specific parts are thickened to strengthen the protection of the key parts of the vehicle. For example, the protective layer 200 has a first protective section 230 and two second protective sections 240, the two second protective sections 240 are respectively connected to the two sides of the first protective section 230, the two second protective sections 240 are thickened, or only one layer of corrugated core is retained in the first protective section 230, and the second direction is the length direction of the vehicle, such as along Figure 1 As shown in the middle X-axis direction, therefore, the two second protection sections 240 can respectively provide enhanced protection for the bottom of the front and rear of the vehicle to improve the impact resistance of the easily-collision-prone areas, and the first protection section 230 can protect the middle bottom of the vehicle to reduce weight.

[0079] The specific length, thickness, etc. of the first protection segment 230 and the second protection segment 240 can be determined according to actual needs and are not specifically limited in this embodiment.

[0080] Furthermore, in this embodiment, the aperture of each first receiving hole 2101 in the first protection segment 230 is smaller than the aperture of each first receiving hole 2101 in the second protection segment 240 .

[0081] In this way, the aperture of each first receiving hole 2101 of the first protective segment 230 is reduced. (Not shown in the figure) The number of first receiving holes 2101 increases, and the first receiving holes 2101 are distributed more densely, that is, the honeycomb holes in the first protective segment 230 are encrypted, which can provide denser support and increase overall toughness.

[0082] Furthermore, in this embodiment, the protection layer 200 further has a transition section 250 along the second direction, and the transition section 250 connects the first protection section 230 and the second protection section 240 .

[0083] Such settings, such as Figure 4 As shown, the first protection segment 230 and the second protection segment 240 are connected by the transition segment 250, so that the stiffness or strength of the first protection segment 230 and the second protection segment 240 can be smoothly transitioned and are not easily broken or damaged.

[0084] For example, in this embodiment, the transition section 250 includes a corrugated core group 251 and a second shear thickening body, and one side of the corrugated core group 251 is connected to a portion of the surface of the honeycomb core group 210 in the first protection section 230 away from the metal layer 100 .

[0085] The other side of the corrugated core group 251 is connected to the side of the honeycomb core group 210 in the second protection segment 240 facing the first protection segment 230 , and the second shear thickening body is filled in the corrugated core group 251 .

[0086] Specifically, Figure 3 , Figure 4 As shown, the shape of each second receiving hole 2501 on the corrugated core group 251 can be a triangle, a trapezoid, a rhombus, etc., and the second shear thickening body can also be the above-mentioned shear thickening fluid or shear thickening glue.

[0087] In this way, by combining a corrugated structure that is insensitive to curved surface structures with a composite transition layer formed by a shear thickening material, a gradual transition is performed on the connection between the first protection segment 230 and the second protection segment 240 , which can better adapt to complex load environments.

[0088] Furthermore, in this embodiment, the corrugated core group 251 includes at least a first corrugated core 2511 and a second corrugated core 2512 , and the first corrugated core 2511 and the second corrugated core 2512 are stacked along a first direction.

[0089] The first corrugated core 2511 and the second corrugated core 2512 each have a plurality of second accommodating holes 2501 , and the second shear thickening body is filled in each of the second accommodating holes 2501 .

[0090] Specifically, the first corrugated core 2511 and the second corrugated core 2512 can be arranged vertically, crosswise or in parallel, and the bending resistance thereof is improved by stacking the first corrugated core 2511 and the second corrugated core 2512. The surface of the first corrugated core 2511 away from the second corrugated core 2512 is connected to a part of the surface of the honeycomb core group 210 in the first protection section 230 away from the metal layer 100, and the end surfaces of the first corrugated core 2511 and the second corrugated core 2512 are connected together to the side of the honeycomb core group 210 in the second protection section 240 facing the first protection section 230.

[0091] Of course, a larger number of corrugated cores may be provided in the corrugated core group 251. Moreover, the second receiving holes 2501 in each layer of the corrugated core may be provided in different shapes, sizes and arrangements, and the thickness of each layer of the corrugated core may also be different. This embodiment does not impose too many restrictions on this.

[0092] Furthermore, in this embodiment, the extension direction of the first corrugated core 2511 is consistent with or intersects with the extension direction of the second corrugated core 2512 .

[0093] Specifically, the extension direction of the first corrugated core 2511 is perpendicular to the extension direction of the second corrugated core 2512. By stacking the first corrugated core 2511 and the second corrugated core 2512 perpendicularly, the bending resistance is further improved and it is not easy to break. Of course, the extension direction of the first corrugated core 2511 and the extension direction of the second corrugated core 2512 can also be consistent, such as Figure 4 As shown, all along Figure 4 Extends in the X-axis direction.

[0094] In some embodiments, the transition section 250 further includes a second seal 252 , which is connected to the corrugated core group 251 on the side away from the metal layer 100 and the second protection section 240 , and blocks the second receiving hole 2501 .

[0095] Specifically, the second sealing member 252 may also be a plate-shaped, sheet-shaped or other structure made of the above-mentioned glass fiber material. After each second receiving hole 2501 is filled with the second shear thickening agent, the corrugated core group 251 on the side facing away from the metal layer 100 and the second protective section 240 is sealed by the second sealing member 252 to facilitate production and processing.

[0096] Furthermore, in this embodiment, the second sealing member 252 smoothly transitions with the first protection segment 230 and the second protection segment 240 , respectively.

[0097] For example, Figure 6 As shown, the surface of the transition section 250 facing away from the metal layer 100 and the second protection section 240 is inclined from the first protection section 230 to the second protection section 240. In this way, the connection performance is ensured while the processing is facilitated.

[0098] Of course, the surface of the transition section 250 facing away from the metal layer 100 from the first protective section 230 to the second protective section 240 can also be a concave arc surface, and the second seal 252 and the first seal 220 can be integrally formed, and any shape that can achieve a uniform transition is acceptable. In this regard, no excessive restrictions are made in this embodiment.

[0099] In a second aspect, an embodiment of the present application further provides a battery pack, comprising a bottom guard plate provided in any of the above embodiments. For example, the bottom guard plate can be arranged at the bottom of the battery pack.

[0100] Among them, the structure of the bottom guard plate has been described in detail in the above embodiments, and will not be repeated here.

[0101] Specifically, the bottom guard plate can be connected to the bottom of the battery tray 10 by bonding, pressing, etc., and multiple battery modules can be arranged side by side on the battery tray 10 and packaged into a battery pack through a cover. In addition, multiple mounting holes can be set on the circumference of the bottom guard plate, and fasteners such as bolts can be passed through the mounting holes to connect to the bottom of the vehicle body.

[0102] The battery pack provided in the embodiment of the present application is configured with a bottom guard plate, which includes a metal layer 100 and a protective layer 200. The protective layer 200 is provided on at least one surface of the metal layer 100 to enhance protection, wherein the protective layer 200 includes a honeycomb core group 210 and a first shear thickening body. One side of the honeycomb core group 210 is connected to the surface of one side of the metal layer 100, and the first shear thickening body is filled in the honeycomb core group 210, that is, a composite protective layer is formed by combining a shear thickening material with a honeycomb structure. The shear thickening material can quickly harden when subjected to external impact, thereby enhancing the impact resistance. After the external force is eliminated, the shear thickening material restores its original properties, reducing the continuous damage to the battery pack, maintaining the integrity of the battery pack under extreme conditions, and preventing battery leakage or short circuit caused by structural deformation or damage.

[0103] In a third aspect, an embodiment of the present application further provides a vehicle, comprising a battery pack provided by any of the above embodiments. The vehicle may be a new energy vehicle. The vehicle may include a vehicle body, and the battery pack may be installed at the bottom of the vehicle body.

[0104] It can be understood that the vehicle provided in the embodiment of the present application is configured with the above-mentioned battery pack, wherein the battery includes a bottom guard plate, and the bottom guard plate includes a metal layer 100 and a protective layer 200. The protective layer 200 is provided on at least one surface of the metal layer 100 to enhance protection, wherein the protective layer 200 includes a honeycomb core group 210 and a first shear thickening body. The honeycomb core group 210 is connected to one side of the metal layer 100, and the first shear thickening body is filled in the honeycomb core group 210, that is, a composite protective layer is formed by combining a shear thickening material with a honeycomb structure. The shear thickening material can quickly harden when subjected to external impact, thereby enhancing the impact resistance. After the external force is eliminated, the shear thickening material restores its original properties, reduces the continuous damage to the battery pack, maintains the integrity of the battery pack under extreme conditions, and prevents battery leakage or short circuit caused by structural deformation or damage.

[0105] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the application disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the claims.

[0106] It should be understood that the present application is not limited to the precise structures described above and shown in the appended drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A bottom guard plate, used to be arranged at the bottom of a battery pack, characterized in that: The bottom guard plate comprises a metal layer (100) and a protective layer (200), and the protective layer (200) is provided on at least one surface of the metal layer (100); The protective layer (200) comprises a honeycomb core group (210) and a first shear thickening body, one side of the honeycomb core group (210) is connected to the surface of one side of the metal layer (100), and the first shear thickening body is filled in the honeycomb core group (210).

2. The bottom guard plate according to claim 1, characterized in that: The honeycomb core group (210) comprises at least a first honeycomb core (211) and a second honeycomb core (212), wherein the first honeycomb core (211) and the second honeycomb core (212) are stacked along a first direction intersecting the metal layer (100); The side of the second honeycomb core (212) facing away from the first honeycomb core (211) is connected to the metal layer (100), and the first honeycomb core (211) and the second honeycomb core (212) both have a plurality of first receiving holes (2101), and the first shear thickening body is filled in each of the first receiving holes (2101).

3. The bottom guard plate according to claim 2, characterized in that: The aperture of each of the first accommodating holes (2101) on the first honeycomb core (211) is larger or smaller than the aperture of each of the first accommodating holes (2101) on the second honeycomb core (212).

4. The bottom guard plate according to claim 2, characterized in that: The protective layer (200) further comprises a first sealing member (220), wherein the first sealing member (220) is connected to the first honeycomb core (211) on a side facing away from the metal layer (100) and seals each of the first receiving holes (2101).

5. The bottom guard plate according to claim 2, characterized in that: The protective layer (200) is divided into a first protective segment (230) and at least one second protective segment (240) along a second direction parallel to the metal layer (100); The second protection segment (240) is located on one side of the first protection segment (230), and the thickness of the first protection segment (230) is smaller than the thickness of the second protection segment (240).

6. The bottom guard plate according to claim 5, characterized in that: The aperture of each of the first accommodating holes (2101) in the first protection segment (230) is smaller than the aperture of each of the first accommodating holes (2101) in the second protection segment (240).

7. The bottom guard plate according to claim 5, characterized in that: The protective layer (200) further comprises a transition section (250) along the second direction, wherein the transition section (250) connects the first protective section (230) and the second protective section (240).

8. The bottom guard plate according to claim 7, characterized in that: The transition section (250) comprises a corrugated core group (251) and a second shear thickening body, and one side of the corrugated core group (251) is connected to a portion of the surface of the honeycomb core group (210) in the first protection section (230) that is away from the metal layer (100); The other side of the corrugated core group (251) is connected to the side of the honeycomb core group (210) in the second protection segment (240) facing the first protection segment (230), and the second shear thickening body is filled in the corrugated core group (251).

9. The bottom guard plate according to claim 8, characterized in that: The corrugated core group (251) comprises at least a first corrugated core (2511) and a second corrugated core (2512), wherein the first corrugated core (2511) and the second corrugated core (2512) are stacked along the first direction; The first corrugated core (2511) and the second corrugated core (2512) are each provided with a plurality of second receiving holes (2501), and the second shear thickening body is filled in each of the second receiving holes (2501).

10. The bottom guard plate according to claim 9, characterized in that: An extension direction of the first corrugated core (2511) is consistent with or intersects with an extension direction of the second corrugated core (2512).

11. The bottom guard plate according to claim 9, characterized in that: The transition section (250) further comprises the second sealing member (252), the second sealing member (252) being connected to the corrugated core group (251) on the side facing away from the metal layer (100) and the second protective section (240), and sealing the second receiving hole (2501).

12. The bottom guard plate according to claim 11, characterized in that: The second sealing member (252) smoothly transitions with the first protection segment (230) and the second protection segment (240), respectively.

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

14. A vehicle, characterized in that: Comprising the battery pack as claimed in claim 13.

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