Bottom protection structure, preparation method, battery pack and electric equipment

Abstract

The embodiment of the invention provides a bottom protection structure, a preparation method, a battery pack and electric equipment, and relates to the technical field of battery packs. The foaming material layer is arranged on the bottom protection plate; the energy absorption framework is at least partially embedded in the foaming material layer, the rigidity of the energy absorption framework is greater than that of the foaming material layer, and the energy absorption framework is configured to absorb energy through deformation when being extruded, so that the protection effect of the bottom protection structure on the battery can be effectively improved under the condition that the volume of the bottom protection structure is not excessively increased.

Description

Technical Field

[0001] The present application relates to the technical field of battery packs, and in particular to a bottom protection structure, a preparation method, a battery pack and electrical equipment. Background Art

[0002] As people pay more and more attention to environmental protection and low carbon, the pace of development of new energy vehicles has also accelerated significantly. The integration of automobiles with related technologies in the fields of energy, transportation, information and communications has accelerated, and electrification, networking and intelligence have become the development trend of the automobile industry. New technologies for new energy vehicles have sprung up, for example: The following two patents both describe hybrid technologies that are mainly electric, with multiple advantages such as fast, economical, quiet, smooth and green: The application number is CN202410658157.7, the publication number is CN118238797B, and the invention name is New Energy Vehicle Energy Intelligent Management System, Control Method and Related Equipment; The application number is CN202410672579.X, the publication number is CN118597091A, and the invention name is "New Energy Vehicle Energy Intelligent Management Method, System and Related Equipment"; The following three patents all describe a new energy power system with four wheel-side motors independently driven as the core, which greatly improves the safety and power of new energy vehicles: The application number is CN202211678720.4, the publication number is CN117382629B, and the invention name is vehicle power control method, device, medium, vehicle controller and vehicle; The application number is CN202311164098.X, the publication number is CN116890770B, and the invention name is vehicle control system, method and vehicle; The application number is CN202311170393.6, the publication number is CN117533292B, and the name of the invention is vehicle control system, control method, controller and vehicle.

[0003] Among them, the battery pack is an indispensable and important component in new energy vehicles that mainly use electricity. A bottom guard plate and thermal insulation cotton are generally set at the bottom of the battery pack. The bottom guard plate and thermal insulation cotton can improve the low-temperature performance of the battery pack on the one hand, and reduce the impact of obstacles on the bottom of the battery on the other hand.

[0004] However, the bottom guard plate and thermal insulation cotton can absorb little impact energy when colliding with an obstacle. If the obstacle exerts a large impact force on the battery pack, the protective effect of the bottom guard plate and thermal insulation cotton on the internal battery will be relatively limited. Summary of the invention

[0005] The embodiments of the present application provide a bottom protection structure, a preparation method, a battery pack and an electrical device to enhance the protection effect on the battery.

[0006] In a first aspect, an embodiment of the present application provides a bottom protection structure, comprising: Bottom guard plate; A foam material layer is provided on the bottom guard plate; The energy absorbing skeleton is at least partially embedded in the foam material layer. The rigidity of the energy absorbing skeleton is greater than the rigidity of the foam material layer. The energy absorbing skeleton is configured to absorb energy by deformation when being squeezed.

[0007] In a possible implementation manner, the energy absorbing skeleton is entirely embedded in the foam material layer.

[0008] In a possible implementation, the energy absorbing frame includes at least one main body portion, and at least one energy absorbing protrusion is provided on the main body portion.

[0009] In a possible implementation manner, the main body and / or the energy absorbing protrusion are provided with through holes for the foaming material of the foaming material layer to pass through.

[0010] In a possible implementation, the main body includes two connecting plates arranged opposite to each other, at least one of the two connecting plates is provided with a plurality of the energy absorbing protrusions, and the energy absorbing protrusions are configured to form energy absorbing holes by correspondingly cooperating with the other connecting plate or the energy absorbing protrusions on the other connecting plate when the two connecting plates are connected; Wherein, at least one of the energy absorbing protrusions forming the energy absorbing hole is provided with the through hole, so that the foaming material of the foaming material layer enters into the energy absorbing hole through the through hole.

[0011] In a possible implementation manner, at least two main body parts are stacked and arranged, and the energy absorption holes on adjacent main body parts are arranged in one-to-one correspondence and are connected.

[0012] In a possible implementation manner, the energy absorbing protrusion is an arc-shaped protrusion, and / or the energy absorbing hole is a spherical hole.

[0013] In a possible implementation manner, the energy absorbing protrusion is a convex strip.

[0014] In a possible implementation, the foaming material used in the foaming material layer is a closed-cell foaming material.

[0015] In a second aspect, an embodiment of the present application provides a method for preparing a bottom protection structure, comprising: Provide bottom guard plate; providing a foam material layer; Providing an energy absorbing skeleton, wherein the energy absorbing skeleton is at least partially embedded in the foam material layer; The foam material layer is fixed on the bottom guard plate.

[0016] In a possible implementation manner, providing an energy absorbing skeleton further comprises: Providing a main body, on which a plurality of energy-absorbing protrusions are arranged, and through holes are opened on the main body and / or the energy-absorbing protrusions; Providing the foaming material layer comprises: Placing the main body in a foaming mold, and ensuring that there is a gap between the main body and each inner surface of the foaming mold; The foaming material is placed in the foaming mold for foaming, so that part of the foaming material enters the through hole and the energy absorbing protrusion, and part of the foaming material is covered outside the main body, thereby obtaining the foaming material layer.

[0017] In a third aspect, an embodiment of the present application provides a battery pack, comprising a box body, and a bottom protective structure as described in any one of the first aspects, or a bottom protective structure prepared by the preparation method of the bottom protective structure as described in any one of the second aspects, wherein the bottom protective structure is connected to the box body.

[0018] In a fourth aspect, an embodiment of the present application provides an electrical device, comprising a device body and the battery pack described in the third aspect, wherein the battery pack is used to supply power to the device body.

[0019] In the bottom protection structure, preparation method, battery pack and electrical equipment provided in the embodiments of the present application, the bottom protection structure includes a bottom protection plate, a foam material layer and an energy absorbing frame. The energy absorbing frame is at least partially embedded in the foam material layer, and the foam material layer is connected to the bottom protection plate. During the use of the battery pack, the foam material layer can have a good thermal insulation effect. At the same time, since the rigidity of the energy absorbing frame is greater than the rigidity of the foam material layer, the external collision energy can be absorbed by the deformation of the energy absorbing frame, thereby improving the protection effect on the battery. In addition, the energy absorbing frame is at least partially embedded in the foam material layer. Compared with the separate arrangement of the foam material layer and the energy absorbing frame, the space can be fully utilized to meet the battery pack's requirements for installation space. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0021] Figure 1 A schematic diagram of the exploded structure of a battery pack provided in an embodiment of the present application; Figure 2 A schematic diagram of the structure of the bottom protection structure provided in an embodiment of the present application; Figure 3 A schematic diagram of the structure of the foam material layer of the bottom protection structure provided in an embodiment of the present application; Figure 4 A schematic structural diagram of a first implementation of an energy-absorbing skeleton of a bottom protection structure provided in an embodiment of the present application; Figure 5 for Figure 4 A schematic structural diagram of the energy-absorbing skeleton from another perspective; Figure 6 A schematic structural diagram of a second implementation of the energy-absorbing skeleton of the bottom protection structure provided in an embodiment of the present application; Figure 7 for Figure 6 A schematic structural diagram of the energy-absorbing skeleton from another perspective; Figure 8 for Figure 7 AA section view in.

[0022] Reference numerals: 110-bottom guard plate; 120-foam material layer; 130-energy absorbing skeleton; 131-main body; 1311-connecting plate; 132-energy absorbing protrusion; 133-through hole; 134-energy absorbing hole; 200-cabinet.

[0023] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0024] 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 devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0025] A battery pack usually refers to a combination of multiple battery cells that are used to provide power to various devices or systems. Battery packs can be used in many fields, including but not limited to various electrical devices such as electric vehicles, consumer electronics, energy storage systems, and industrial equipment.

[0026] The battery pack is easily bumped in some usage scenarios. For example, when used in new energy vehicles, road obstacles can easily bump into the battery pack at the bottom of the vehicle, causing damage to the internal batteries.

[0027] At present, the bottom protection structure of the battery pack generally includes thermal insulation cotton and a bottom protection plate. The thermal insulation cotton is generally made of foamed polyurethane, polyethylene, etc. These materials have good thermal insulation properties and are easy to be compressed. This also makes it difficult for the thermal insulation cotton to effectively absorb the energy that is harmful to the internal battery caused by external bumps, thereby making the protective effect of the bottom protection structure on the battery pack relatively limited.

[0028] In this regard, the embodiments of the present application provide a bottom protective structure, a preparation method, a battery pack and an electrical device. The bottom protective structure can save the space occupied by the bottom protective structure while enabling the bottom protective structure to have both thermal insulation and anti-collision capabilities, by at least partially embedding the energy-absorbing skeleton in the foam material layer, thereby effectively improving the protection effect of the batteries in the battery pack, thereby improving the stability and safety of electricity use by the electrical equipment.

[0029] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0030] In some embodiments of this application, see Figure 1 As shown, the battery pack includes a box body 200 and a bottom protective structure. The box body 200 is fixed on the bottom protective structure. The battery is located between the box body 200 and the bottom protective structure and is protected by the bottom protective structure and the box body 200.

[0031] It is understandable that the box 200 is usually made of a light and strong material, such as aluminum alloy, steel or composite material, which has good mechanical strength, corrosion resistance and thermal management performance, and can protect the internal battery. In this embodiment, the battery is used to store and release electrical energy, which may include a plurality of battery cells, which are connected in parallel or in series to meet the specific voltage and capacity requirements of the electrical equipment. The battery cell may be a lithium-ion battery cell, a nickel-metal hydride battery cell, a lead-acid battery cell, etc., which is not limited in this embodiment.

[0032] In some embodiments of this application, see Figure 2 , Figure 3 and Figure 4 As shown, the bottom protection structure includes a bottom protection plate 110 , a foam material layer 120 and an energy absorbing skeleton 130 .

[0033] The bottom guard plate 110 is used to connect with the box body 200 of the battery pack. The bottom guard plate 110 is usually made of a strong material, such as metal (aluminum alloy, steel, etc.) or high-strength plastic, to provide sufficient protection and will not easily deform significantly. The foam material layer 120 is arranged on the bottom guard plate 110, which can play a good thermal insulation effect to meet the use requirements of the battery. The energy absorbing frame 130 is at least partially embedded in the foam material layer 120.

[0034] The rigidity of the energy-absorbing skeleton 130 is greater than that of the foam material layer 120 . When squeezed, the energy-absorbing skeleton 130 absorbs energy by deformation and destruction, thereby reducing the damage to the internal battery caused by the external strong collision and providing better protection for the battery.

[0035] Specifically, the energy-absorbing skeleton 130 may be supported by composite materials, metals, etc. having a certain rigidity, and may be structurally designed, such as reducing the volume occupied by the solid part, so that the impact energy may be attenuated by deformation under a certain impact force, which is not limited in this embodiment.

[0036] Embedding at least part of the energy absorbing skeleton 130 into the foam material layer 120 helps to reduce the space occupied by the energy absorbing skeleton 130 and the volume of the bottom protective structure, so that the bottom protective structure can adapt to the volume requirements of the battery pack.

[0037] Exemplarily, the energy-absorbing skeleton 130 can be completely embedded in the foam material layer 120. At this time, the energy-absorbing skeleton 130 will not directly contact other structures such as the bottom guard plate 110 and the battery pack box 200, which can prevent the energy-absorbing skeleton 130 from having rigid contact with other components and emitting abnormal friction noise. At the same time, the energy-absorbing skeleton 130 can be protected by the foam material layer 120 to prevent the energy-absorbing skeleton 130 from being eroded, so that it always maintains good energy absorption capacity. In addition, the energy-absorbing skeleton 130 is completely embedded in the foam material layer 120, which can also prevent the energy-absorbing skeleton 130 from contacting other components for heat conduction, so that the energy-absorbing skeleton 130 will not affect the thermal insulation performance of the bottom guard structure.

[0038] It is understandable that the energy absorbing skeleton 130 may be a whole structure or a combination of multiple separate structures, which is not limited in this embodiment.

[0039] In some embodiments of the present application, the energy absorbing skeleton 130 includes a main body 131, on which is disposed at least one energy absorbing protrusion 132, and the protruding portion of the energy absorbing protrusion 132 is a non-solid portion, so that the energy absorbing protrusion 132 can be deformed or destroyed due to squeezing when subjected to a strong external impact, thereby attenuating the impact energy.

[0040] Furthermore, in order to further improve the thermal insulation performance and anti-collision energy absorption protection capability of the bottom protection structure, through holes 133 are provided on the main body 131 and / or the energy absorption protrusions 132 for the foaming material of the foaming material layer 120 to pass through.

[0041] The foaming material of the foaming material layer 120 flows between the energy absorbing skeleton 130 through the through hole 133 and can be filled in the energy absorbing protrusion 132, which can not only block the convection of cold and hot air in the non-solid part of the energy absorbing skeleton 130, thereby improving the overall thermal insulation performance of the bottom protection structure, but also enhance the compressive performance of the energy absorbing skeleton 130, thereby increasing the pressure required for the same deformation and improving its energy absorption performance.

[0042] In some embodiments of this application, see Figure 4 and Figure 5 As shown, the energy-absorbing protrusion 132 is a convex strip, and the extension direction of the convex strip is the same as the extension direction of the main body 131. A plurality of convex strips can be provided, and the convex strips are arranged at intervals. The through hole 133 can be provided on the energy-absorbing protrusion 132, or at other positions of the main body 131, or partially located on the energy-absorbing protrusion 132 and partially located at the position of the main body 131 for connecting the energy-absorbing protrusion 132.

[0043] Among them, the main body 131 can be a metal plate, which can be directly bent to form a plurality of convex strips arranged side by side during processing, or the metal material can be directly die-cast to form the main body 131 of the above structure. This embodiment only illustrates the processing method, but does not limit it.

[0044] For example, see Figure 6 As shown, the energy absorbing protrusion 132 may also be an arc-shaped protrusion or a protrusion of other shapes, as long as the portion protruding outside the main body 131 is a non-solid structure and can generate deformation and sound absorption energy when subjected to a certain pressure.

[0045] In some embodiments of this application, see Figure 6 , Figure 7 and Figure 8 As shown, the main body 131 includes two connecting plates 1311 arranged opposite to each other, and at least one of the two connecting plates 1311 is provided with a plurality of energy absorption protrusions 132. When the two connecting plates 1311 are connected, the energy absorption protrusions 132 arranged on one connecting plate 1311 correspond to and cooperate with the other connecting plate 1311 or the energy absorption protrusions 132 on the other connecting plate 1311 to form energy absorption holes 134.

[0046] At least one of the energy absorbing protrusions 132 forming the energy absorbing hole 134 is provided with a through hole 133 , so that the foaming material of the foaming material layer 120 enters the energy absorbing hole 134 through the through hole 133 to fill the energy absorbing hole 134 .

[0047] It is understandable that a through hole 133 may also be provided corresponding to the non-energy-absorbing protrusion 132 of the connecting plate 1311, so that the foaming material can pass through the through hole 133 and move on both sides of the connecting plate 1311, or can be filled inside the through hole 133, thereby facilitating the flow of the foaming material when connecting the foaming material layer 120 and the energy-absorbing skeleton 130.

[0048] Exemplarily, the energy absorbing protrusions 132 on the two connecting plates 1311 are arranged in one-to-one correspondence, and the energy absorbing protrusions 132 on the two connecting plates 1311 are both arranged to be hemispherical, so that the energy absorbing hole 134 is a spherical hole. Such a structure helps to improve the convenience of processing.

[0049] Specifically, the two connecting plates 1311 can be processed using the same mold or processing equipment, which can effectively reduce the processing difficulty and processing cost. After the two connecting plates 1311 are overlapped and connected, there are corresponding energy-absorbing protrusions 132 on both sides, which is also convenient for absorbing energy.

[0050] Exemplarily, one connecting plate 1311 is provided with an energy absorbing protrusion 132, while the other connecting plate 1311 is not provided with an energy absorbing protrusion 132. When the two are connected to each other and overlap, the open end of the energy absorbing protrusion 132 is closed by the other connecting plate 1311 to form an energy absorbing hole 134 in a hemispherical or cubic shape, wherein the specific shape of the energy absorbing hole 134 is determined by the shape of the energy absorbing protrusion 132.

[0051] Exemplarily, the energy absorbing protrusions 132 on the two connecting plates 1311 are arranged in a staggered manner. When the two connecting plates 1311 are connected, the energy absorbing protrusions 132 on each connecting plate 1311 can cooperate with the other connecting plate 1311 to form an energy absorbing hole 134 .

[0052] It should be understood that the above examples are only for illustration and not for limitation.

[0053] In some embodiments of the present application, at least two main bodies 131 are stacked and arranged, and the energy absorbing holes 134 on adjacent main bodies 131 are arranged in one-to-one correspondence and are connected.

[0054] In this way, when the main body 131 is provided with multiple layers, it can be ensured that each energy absorbing hole 134 has at least one node connected to the outside, so that the foaming material can enter the energy absorbing hole 134 through the node.

[0055] In actual applications, it is preferable that the energy absorption hole 134 has at least two nodes connected to the outside world. In this way, when the foam material is filled, the internal gas can be discharged through different nodes, so that the foam material can be better filled in the energy absorption hole 134, thereby improving the thermal insulation capacity and the carrying capacity of the energy absorption skeleton 130.

[0056] Therefore, each energy absorbing hole 134 may have at least two through holes 133 .

[0057] Exemplarily, when the energy absorbing hole 134 is formed by the corresponding cooperation of the energy absorbing protrusions 132 on the two connecting plates 1311 , the through holes 133 may be provided on both of the two energy absorbing protrusions 132 .

[0058] Exemplarily, when the energy absorbing hole 134 is formed by the energy absorbing protrusion 132 on one connecting plate 1311 and another connecting plate 1311 , through holes 133 may be provided at corresponding positions of the energy absorbing hole 134 and the corresponding connecting plate 1311 .

[0059] It is understandable that this is just an example of making the energy absorption hole 134 have at least two nodes connected to the outside world. Through holes 133 can also be opened at other positions, or the number of energy absorption holes 134 and through holes 133 on the connecting plate 1311 can be increased to increase the number of nodes connecting the energy absorption hole 134 with the outside world. This embodiment does not limit this.

[0060] In some embodiments of the present application, the foaming material used in the foaming material layer 120 is a closed-cell foaming material.

[0061] Specifically, the pores of the closed-cell foam material are not interconnected, which can block the contact between the energy-absorbing skeleton 130 and the outside air or muddy water, making the energy-absorbing skeleton 130 less susceptible to corrosion or aging, especially for the energy-absorbing skeleton 130 made of metal materials, which has an excellent protective effect. At the same time, the closed-cell foam material can also prevent the gas from flowing in the foam material layer 120, which can avoid the gas from conducting heat, thereby improving the thermal insulation performance.

[0062] It is understandable that the foam material layer 120 can also be made of open-cell foam material. When using open-cell foam material, it is only necessary to perform closed-cell treatment on the surface of the foam material layer 120 to prevent gas from entering the interior of the foam material layer 120.

[0063] The closed-cell treatment may be performed by coating the surface with a sealing material, such as polyurethane, polyethylene or silicone coating, or by conventional treatment methods such as chemical impregnation treatment and plasma treatment, which are well known to those skilled in the art and will not be described in detail in this embodiment.

[0064] The present application also provides a method for preparing the bottom protection structure in the above embodiment, comprising: A bottom guard plate 110 is provided, and the bottom guard plate 110 is used to be connected to the box body 200, so a mounting portion connected to the box body 200 is provided; Providing a foaming material layer 120, the foaming material layer 120 is made of a heat-insulating material and is mainly used for heat preservation; An energy absorbing skeleton 130 is provided, wherein the energy absorbing skeleton 130 is at least partially embedded in the foam material layer 120 , that is, the energy absorbing skeleton 130 can at least share a portion of the space with the foam material layer 120 .

[0065] Optionally, the energy-absorbing skeleton 130 is completely embedded in the foam material layer 120. In this case, the energy-absorbing skeleton 130 will not come into direct contact with other structures such as the bottom guard plate 110 and the battery pack box 200, thereby preventing the energy-absorbing skeleton 130 from having rigid contact with other components and emitting abnormal friction noise. At the same time, the energy-absorbing skeleton 130 can be protected by the foam material layer 120 to prevent the energy-absorbing skeleton 130 from being corroded, so that it always maintains good energy absorption capacity. In addition, making the energy-absorbing skeleton 130 completely embedded in the foam material layer 120 can also prevent the energy-absorbing skeleton 130 from contacting other components for heat conduction, thereby preventing the energy-absorbing skeleton 130 from affecting the thermal insulation performance of the bottom guard structure.

[0066] The foam material layer 120 is fixed on the bottom protection plate 110, and the preparation of the bottom protection structure is completed.

[0067] After the bottom guard plate 110 is connected to the box body 200 , the bottom guard structure can effectively improve the energy absorption effect without increasing the occupied space too much, thereby providing better protection for the batteries in the box body 200 .

[0068] In some embodiments of the present application, the method for preparing the bottom protection structure includes: Providing a bottom guard plate 110; Providing energy absorbing frame 130: At least one main body 131 is provided. The main body 131 may be a metal plate or two stacked metal plates. Of course, it may not be a metal plate, but a plate made of other composite materials that can meet the use requirements. A plurality of energy-absorbing protrusions 132 are provided on the main body 131, and a plurality of through holes 133 are opened on the main body 131 and / or the energy-absorbing protrusions 132.

[0069] Optionally, the main body 131 is a metal plate on which a plurality of convex strips arranged side by side are arranged, and a plurality of through holes 133 are arranged in the convex strips and / or in the non-convex strip portions of the metal plate.

[0070] Optionally, the main body 131 is composed of two stacked connecting plates 1311, and an energy absorbing protrusion 132 is provided on at least one of the two connecting plates 1311. After the two connecting plates 1311 overlap, the energy absorbing protrusion 132 can cooperate with the other connecting plate 1311 or the energy absorbing protrusion 132 on the other connecting plate 1311 to form an energy absorbing hole 134. At least one of the energy absorbing protrusions 132 that form the energy absorbing hole 134 is provided with a through hole 133, and the through hole 133 may or may not be provided on the connecting plate 1311.

[0071] Optionally, when two or more main body parts 131 are provided, the plurality of main body parts 131 are stacked in sequence, and the through holes 133 on adjacent main body parts 131 are at least partially connected to each other.

[0072] Providing a foaming material layer 120: The main body 131 is placed in a foaming mold, and a gap is provided between the main body 131 and each inner surface of the foaming mold; The foaming material is placed in a foaming mold for foaming, so that part of the foaming material enters the through hole 133 and the energy absorbing protrusion 132 and part of the foaming material is wrapped around the outside of the main body 131 to obtain a foaming material layer 120 .

[0073] Specifically, the energy absorbing skeleton 130 is suspended in the foaming mold. After the foaming material enters the foaming mold, the foaming material can flow through the through holes 133 during foaming to fill all the pores on the energy absorbing skeleton 130, such as the energy absorbing protrusions 132, the through holes 133, the energy absorbing holes 134, etc., and there is a gap between the energy absorbing skeleton 130 and the various inner surfaces of the foaming mold. During foaming, the foaming material can completely cover the outside of the energy absorbing skeleton 130, so that the final energy absorbing skeleton 130 is completely embedded in the foaming material layer 120 and is tightly connected to the foaming material layer 120, that is, the length, width and height of the energy absorbing skeleton 130 are correspondingly smaller than the length, width and height of the foaming material layer 120, so that it is completely wrapped in the foaming material.

[0074] This means that the bottom protection structure does not need to increase the height of the foam material layer 120 compared to the traditional combination of the bottom protection plate 110 and the thermal insulation cotton, that is, it does not need to occupy additional space in the height direction of the battery pack. It can effectively improve the energy absorption effect without affecting the thermal insulation capacity, and ultimately effectively improve the safety of the battery pack.

[0075] It is understandable that the foaming material used here can be a closed-cell foaming material, such as polyurethane, polypropylene or polyethylene, or an open-cell foaming material. However, when using an open-cell foaming material, it is advisable to perform a closed-cell treatment on the surface of the foaming material layer 120 after foaming.

[0076] An embodiment of the present application also provides an electrical device, including a device body and a battery pack using the bottom protection structure of the above embodiment, wherein the battery pack is used to supply power to the device body.

[0077] It can be understood that the electrical equipment in this embodiment includes, but is not limited to, various equipment such as electric vehicles, consumer electronic products, energy storage systems, and industrial equipment.

[0078] Finally, it should be noted that those skilled in the art will readily conceive of other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary technical means in the art not disclosed by the present invention, are not limited to the precise structure described above and shown in the drawings, and may be modified and changed in various ways without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A bottom protection structure, characterized in that: include: Bottom guard plate (110); A foam material layer (120) is provided on the bottom guard plate (110); The energy absorbing skeleton (130) is at least partially embedded in the foam material layer (120); the rigidity of the energy absorbing skeleton (130) is greater than the rigidity of the foam material layer (120); and the energy absorbing skeleton (130) is configured to absorb energy by deformation when being squeezed.

2. The bottom protection structure according to claim 1, characterized in that: The energy absorbing skeleton (130) is entirely embedded in the foaming material layer (120).

3. The bottom protection structure according to claim 2, characterized in that: The energy absorbing skeleton (130) comprises at least one main body portion (131), and at least one energy absorbing protrusion (132) is provided on the main body portion (131).

4. The bottom protection structure according to claim 3, characterized in that: The main body (131) and / or the energy absorbing protrusion (132) are provided with through holes (133) for the foaming material of the foaming material layer (120) to pass through.

5. The bottom protection structure according to claim 4, characterized in that: The main body (131) comprises two connecting plates (1311) arranged opposite to each other, at least one of the two connecting plates (1311) is provided with a plurality of energy absorbing protrusions (132), and the energy absorbing protrusions (132) are configured to form energy absorbing holes (134) by correspondingly cooperating with the other connecting plate (1311) or the energy absorbing protrusions (132) on the other connecting plate (1311) when the two connecting plates (1311) are connected; Wherein, at least one of the energy absorbing protrusions (132) forming the energy absorbing hole (134) is provided with the through hole (133), so that the foaming material of the foaming material layer (120) can enter the energy absorbing hole (134) through the through hole (133).

6. The bottom protection structure according to claim 5, characterized in that: At least two main body parts (131) are stacked and arranged, and the energy absorbing holes (134) on adjacent main body parts (131) are arranged in one-to-one correspondence and are connected.

7. The bottom protection structure according to claim 5, characterized in that: The energy absorbing protrusion (132) is an arc-shaped protrusion, and / or the energy absorbing hole (134) is a spherical hole.

8. The bottom protection structure according to claim 4, characterized in that: The energy absorbing protrusion (132) is a convex strip.

9. The bottom protection structure according to any one of claims 1 to 8, characterized in that: The foaming material used in the foaming material layer (120) is a closed-cell foaming material.

10. A method for preparing a bottom protection structure, characterized in that: include: Providing a bottom guard plate (110); Providing a foam material layer (120); Providing an energy absorbing skeleton (130), wherein the energy absorbing skeleton (130) is at least partially embedded in the foaming material layer (120); The foam material layer (120) is fixed on the bottom guard plate (110).

11. The method for preparing the bottom protection structure according to claim 10, characterized in that: The providing of the energy absorbing skeleton (130) further comprises: A main body (131) is provided, wherein a plurality of energy absorbing protrusions (132) are arranged on the main body (131), and through holes (133) are arranged on the main body (131) and / or the energy absorbing protrusions (132); Providing the foaming material layer (120) includes: Placing the main body (131) in a foaming mold, and ensuring that there is a gap between the main body (131) and each inner surface of the foaming mold; The foaming material is placed in the foaming mold for foaming, so that part of the foaming material enters the through hole (133) and the energy absorbing protrusion (132), and part of the foaming material is wrapped around the outside of the main body (131), thereby obtaining the foaming material layer (120).

12. A battery pack, characterized in that: It comprises a box body (200), and a bottom protective structure according to any one of claims 1 to 9 or a bottom protective structure prepared by the method for preparing a bottom protective structure according to claim 10 or 11, wherein the bottom protective structure is connected to the box body (200).

13. An electrical equipment, characterized in that: It comprises a device body and the battery pack according to claim 12, wherein the battery pack is used to supply power to the device body.

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