Bottom protection structure of power battery and vehicle

Abstract

The utility model discloses a bottom protection structure of power battery and vehicle, this bottom protection structure is equipped with the bottom of battery box, include: bottom guard board and foam layer, bottom guard board interval setting in the below of the cooling plate of battery box, and the foam layer is clamped between cooling plate and bottom guard board, wherein, the foam layer includes rigid foam and soft foam, rigid foam with soft foam is along the height direction laminated setting, and soft foam is equipped with the above of rigid foam. The utility model discloses through setting rigid foam and soft foam between bottom guard board and cooling plate, utilize the rigidity of rigid foam and promote the anti -impact ability of bottom guard board, and the deformation of bottom guard board is alleviated, simultaneously, the higher flatness of rigid foam can guarantee and soft foam effective connection, and utilize soft foam as buffer layer, can effectively absorb the impact energy, and have structural protection and dynamic buffering effect, and then effectively improve the bottom protection ability of power battery.

Description

Technical Field

[0001] This utility model relates to the field of vehicle battery structure technology, specifically to a bottom protection structure for a power battery and a vehicle thereof. Background Technology

[0002] With the rapid development of electric vehicles, the safety, reliability, and maintainability of power batteries, as the core energy source of vehicles, have received widespread attention. Existing power batteries are typically installed at the bottom of the vehicle, making them susceptible to impacts from road debris (such as stones and metal fragments), potholes, and curbs, which can damage the battery casing and cooling plates.

[0003] To address this, relevant technologies incorporate a bottom protective plate at the bottom of the power battery. This plate is typically made of high-strength steel, possessing sufficient structural strength and rigidity to provide load-bearing and protection. However, this type of bottom protective plate cannot provide cushioning when impacted, allowing the impact energy to be transferred to the battery's interior. This can easily damage the battery cells, affecting normal battery operation and posing safety hazards. Utility Model Content

[0004] In view of the above problems, this utility model provides a bottom protection structure for a power battery and a vehicle, which can effectively improve the bottom protection capability of the power battery.

[0005] According to one aspect of the present invention, a bottom protection structure for a power battery is provided, disposed at the bottom of the battery housing, comprising: a bottom protective plate, spaced apart below the cooling plate of the battery housing; and a foam layer sandwiched between the cooling plate and the bottom protective plate, comprising rigid foam and soft foam, the rigid foam and soft foam being stacked along the height direction, and the soft foam being disposed above the rigid foam.

[0006] In one exemplary embodiment of this utility model, the soft foam and the cooling plate are interference-fitted.

[0007] In an exemplary embodiment of the present invention, the bottom protective plate includes: a first protective plate connected to the battery box and adapted to support the foam layer; and a second protective plate connected to the battery box and spaced apart below the first protective plate to form a buffer space between the first protective plate and the second protective plate.

[0008] In an exemplary embodiment of the present invention, a buffer pad is provided in the buffer space, and the upper and lower surfaces of the buffer pad are respectively attached to the lower surface of the first guard plate and the upper surface of the second guard plate.

[0009] In an exemplary embodiment of this utility model, both the first protective plate and the second protective plate are detachably connected to the battery box.

[0010] In an exemplary embodiment of the present invention, the surface of the first guard plate and / or the second guard plate is further provided with a plurality of reinforcing ribs, including cross-connected transverse reinforcing ribs, longitudinal reinforcing ribs and diagonal reinforcing ribs.

[0011] In an exemplary embodiment of the present invention, the second protective plate is provided with a plurality of leakage holes, which are disposed along the height direction through the surface of the second protective plate.

[0012] In an exemplary embodiment of this utility model, the first protective plate is a steel plate and the second protective plate is an aluminum alloy plate.

[0013] In an exemplary embodiment of the present invention, the lower surface of at least one of the cooling plate, rigid foam, first protective plate, and second protective plate is coated with a puncture-resistant coating.

[0014] According to a second aspect of the present invention, a vehicle is also provided, including the bottom protective structure of a power battery as described above.

[0015] This invention incorporates rigid and soft foam between the bottom protective plate and the cooling plate. The rigid foam enhances the impact resistance of the bottom protective plate and reduces its deformation due to its rigidity. Simultaneously, the high flatness of the rigid foam ensures effective connection with the soft foam. The soft foam, acting as a buffer layer, effectively absorbs impact energy, providing both structural protection and dynamic cushioning, thereby significantly improving the bottom protection capability of the power battery.

[0016] The above description is merely an overview of the technical solutions of the present utility model embodiments. In order to better understand the technical means of the present utility model embodiments and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the present utility model embodiments more obvious and understandable, specific embodiments of the present utility model are described below. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the bottom protective structure of this embodiment is shown;

[0019] Figure 2 A schematic diagram of the structure of the second protective plate in this embodiment is shown;

[0020] Figure 3The image shows a bottom view of the second protective plate installed after the battery box in this embodiment.

[0021] Explanation of icon numbers:

[0022] 1-Battery housing, 11-Cooling plate,

[0023] 2-Bottom guard plate, 21-First guard plate, 22-Second guard plate, 221-Limiting groove, 222-Leakage hole, 23-Buffer pad, 24-First connecting bolt, 25-Second connecting bolt

[0024] 3-Foam layer, 31-Rigid foam, 32-Soft foam.

[0025] 4-Strengthening rib, 41-Transverse strengthening rib, 42-Longitudinal strengthening rib, 43-Diagonal strengthening rib,

[0026] z-height direction.

[0027] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0028] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0029] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a full understanding of embodiments of the present invention. However, those skilled in the art will recognize that the technical solutions of the present invention can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., may be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of the present invention.

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0031] Furthermore, the orientations or positional relationships indicated by terms such as "front," "rear," "left," "right," "up," and "down" mentioned in the embodiments of this utility model are based on the orientations or positional relationships shown in the accompanying drawings. The terms "inner" and "outer" mentioned in the embodiments of this application are defined based on the outline of the corresponding component. It is understood that the above-mentioned terms indicating orientations or positional relationships are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0032] like Figure 1 As shown, this embodiment provides a bottom protection structure for a power battery. This bottom protection structure is located at the bottom of the battery housing 1 and includes a bottom protective plate 2 and a foam layer 3. The bottom protective plate 2 is spaced below the cooling plate 11 of the battery housing 1 and connected to the battery housing 1. After connection, a space is formed between the bottom protective plate 2 and the cooling plate 11 to accommodate the foam layer 3. The foam layer 3 is sandwiched within the space formed between the cooling plate 11 and the bottom protective plate 2. The foam layer 3 includes rigid foam 31 and soft foam 32, which are stacked along the height direction z, with the soft foam 32 positioned above the rigid foam 31. Thus, the rigid foam 31's rigidity enhances the impact resistance of the bottom protective plate 2 and reduces its deformation; the soft foam 32, acting as a buffer layer, effectively absorbs impact energy, providing both structural protection and dynamic buffering effects, thereby effectively improving the bottom protection capability of the power battery.

[0033] Specifically, in this embodiment, the rigid foam 31 can be made of high-density PU foam or other materials with certain hardness, chemical resistance, wear resistance, and aging resistance, and can be fixed to the upper surface of the bottom protective plate 2 by double-sided adhesive. The soft foam 32 can be made of EVA / EPP foam or other materials with certain waterproof and moisture-proof properties and a soft and lightweight texture, and can also be fixed to the upper surface of the rigid foam 31 by double-sided adhesive. Due to the high flatness of the rigid foam 31, the adhesive fixing method can ensure the effective connection between the rigid foam 31 and the bottom protective plate 2, as well as between the rigid foam 31 and the soft foam 32, and also ensure the ease of installation of the rigid foam 31 and the soft foam 32, facilitating subsequent maintenance and replacement. Subsequently, the bottom protective plate 2 is fixed to the bottom frame of the battery box 1 by bolt connection, which clamps and fixes the soft foam 32 and the rigid foam 31 between the cooling plate 11 and the bottom protective plate 2, completing the installation of the bottom protection structure at the bottom of the battery box 1.

[0034] It is understood that the materials and connection methods used for the rigid foam 31 and soft foam 32 in the above embodiments are merely exemplary descriptions intended to explain the advantages of the relevant materials and configuration methods, and should not be construed as limiting this application. In other embodiments, the rigid foam 31 and soft foam 32 may be selected from other materials and other connection methods as needed, which are not limited here and will not be elaborated further.

[0035] In some embodiments, such as Figure 1 As shown, the soft foam 32 is interference-fitted with the cooling plate 11. Specifically, the thickness of the soft foam 32 can be designed to be slightly larger than the distance between the rigid foam 31 and the cooling plate 11 when the bottom cover 2 is connected to the battery box 1. In this way, after the bottom cover 2 is connected to the battery box 1, the upper surface of the soft foam 32 can be tightly attached to the lower surface of the cooling plate 11. Normally, the bottom of the cooling plate 11 has an uneven shape based on the cooling channel arrangement. Through the above-mentioned interference fit, the soft foam 32 can fill or partially fill the concave area of ​​the bottom of the cooling plate 11 and fit tightly with the convex area of ​​the bottom of the cooling plate 11 to ensure the continuity of the force transmission path, thereby improving the strength and energy absorption effect of the bottom cover 2.

[0036] In some embodiments, such as Figure 1 As shown, the bottom protective plate 2 includes a first protective plate 21 and a second protective plate 22. The first protective plate 21 is connected to the battery housing 1 to support the foam layer 3, and its connection to the battery housing 1 includes, but is not limited to, bolt connections. The second protective plate 22 is also connected to the battery housing 1, and its connection includes, but is not limited to, bolt connections. Simultaneously, the second protective plate 22 is spaced below the first protective plate 21 to form a buffer space between the first protective plate 21 and the second protective plate 22. Thus, the bottom protective plate 2 presents a double-layer design, and the buffer space between the first protective plate 21 and the second protective plate 22 can be used as a deformation energy-absorbing area for the bottom protective plate 2, effectively absorbing impact energy and reducing impact damage to the inside of the battery housing 1.

[0037] In some embodiments, such as Figure 1As shown, a buffer pad 23 is also provided between the first protective plate 21 and the second protective plate 22 in the buffer space, and the upper and lower surfaces of the buffer pad 23 are respectively attached to the lower surface of the first protective plate 21 and the upper surface of the second protective plate 22. Specifically, the buffer pad 23 can be made of elastic material with a certain rebound capacity, such as rubber pads. In this embodiment, there are several buffer pads 23, which are evenly arranged in the buffer space in the horizontal direction. The size, specific number, and arrangement of the buffer pads 23 can be selectively arranged according to design requirements, and are not limited here. By setting the buffer pad 23, the continuous force transmission path between the first protective plate 21 and the second protective plate 22 can be ensured while achieving shock absorption and energy dissipation, so that the first protective plate 21 and the second protective plate 22 can be subjected to force as a whole, thereby improving the shock absorption and energy dissipation effect of the bottom protective plate 2.

[0038] It is understandable that the installation method of the buffer pad 23 between the first protective plate 21 and the second protective plate 22 can be that the thickness of the buffer pad 23 is designed to be slightly larger than the distance between the first protective plate 21 and the second protective plate 22 when the first protective plate 21 and the second protective plate 22 are connected to the battery box 1. In this way, after the first protective plate 21 and the second protective plate 22 are connected to the battery box 1, the buffer pad 23 can be clamped between the first protective plate 21 and the second protective plate 22, thereby fixing the buffer pad 23.

[0039] Furthermore, such as Figure 1 and Figure 2 As shown, a limiting groove 221 can also be arranged on the first guard plate 21 and / or the second guard plate 22. The size of the limiting groove 221 is adapted to the size of the buffer pad 23. The buffer pad 23 is arranged in the limiting groove 221. The limiting groove 221 can circumferentially limit the buffer pad 23, thereby further fixing the buffer pad 23 and preventing the buffer pad 23 from moving in the horizontal direction.

[0040] In some embodiments, both the first protective plate 21 and the second protective plate 22 are detachably connected to the battery housing 1. Specifically, as shown in the figure... Figure 1 As shown, in this embodiment, the first protective plate 21 is fixedly connected to the bottom frame of the battery box 1 via the first connecting bolt 24 in the circumferential direction, and the second protective plate 22 is fixedly connected to the bottom frame of the battery box 1 via the second connecting bolt 25 in the circumferential direction. In this way, the first protective plate 21 and the second protective plate 22 are detachable from the battery box 1, and the buffer pad 23 located between the first protective plate 21 and the second protective plate 22, as well as the foam layer 3 located on the first protective plate 21, can be disassembled and replaced as replaceable parts. This not only makes operation and maintenance convenient but also avoids resource waste and saves maintenance costs.

[0041] Furthermore, the bolt connection points of the first protective plate 21 on the battery box 1 are different from those of the second protective plate 22. This can avoid stress concentration and ensure that both protective plates are firmly connected to the battery box 1. On the other hand, the first protective plate 21 and the second protective plate 22 can be disassembled separately from the battery box 1 for easy maintenance and replacement.

[0042] In some embodiments, such as Figures 1 to 3 As shown, the surface of the first guard plate 21 and / or the second guard plate 22 is also provided with a number of reinforcing ribs 4. The reinforcing ribs 4 include cross-connected transverse reinforcing ribs 41, longitudinal reinforcing ribs 42 and diagonal reinforcing ribs 43. The transverse reinforcing ribs 41 are perpendicularly connected to the longitudinal reinforcing ribs 42, and the diagonal reinforcing ribs 43 are connected at an incline at the connection between the transverse reinforcing ribs 41 and the longitudinal reinforcing ribs 42. Through the cross-connection of the three, the strength of the reinforcing ribs 4 is improved. At the same time, the cross-layout of the reinforcing ribs 4 forms a support system similar to a "frame", which can effectively improve the load-bearing capacity and deformation resistance of the bottom guard plate 2.

[0043] Specifically, taking the reinforcing ribs arranged on the second guard plate 22 as an example, such as Figure 2 and Figure 3 As shown, in this embodiment, the reinforcing ribs 4 can be stamped from the upper surface of the second guard plate 22 to the lower surface of the second guard plate 22. This not only simplifies the manufacturing process and improves production efficiency, but also saves material costs and increases material utilization. Meanwhile, in this embodiment, the transverse reinforcing ribs 41 and the longitudinal reinforcing ribs 42 are connected horizontally and vertically to form multiple annularly spaced and concentrically arranged "grid structures," while the diagonal reinforcing ribs 43 are intersecting along the diagonals of the bottom guard plate 2 to further connect the multiple "grid structures" into one unit. In this way, the reinforcing ribs 4 can divide the bottom guard plate 2 into multiple grid areas, allowing the bottom guard plate 2 to distribute the load to each reinforcing rib and each grid area when under stress, avoiding localized stress concentration.

[0044] Furthermore, it is understood that when the second guard plate 22 is equipped with the aforementioned reinforcing rib 4, the grid area of ​​the second guard plate 22 is closer to the first guard plate 21 in the height direction z than the reinforcing rib 4. In this case, the buffer pad 23 should be arranged in the grid area of ​​the second guard plate 22. At the same time, the limiting groove 221 for fixing the buffer pad 23 arranged on the second guard plate 22 is also arranged in the grid area of ​​the second guard plate 22, thereby fixing the buffer pad 23 firmly and effectively between the first guard plate 21 and the second guard plate 22, and ensuring that the buffer pad 23 can play the aforementioned shock absorption and energy absorption function.

[0045] In some embodiments, such as Figure 2 and Figure 3As shown, the surface of the second guard plate 22 is provided with a number of drainage holes 222 that are arranged through the height direction z. In this way, the liquid accumulated in the bottom guard plate 2 under rain or water conditions can be discharged through the drainage holes 222.

[0046] Specifically, such as Figure 2 and Figure 3 As shown, the shape of the leakage hole 222 can be strip-shaped or circular. The strip-shaped leakage hole 222 can be arranged in the grid area of ​​the second protective plate 22, and the circular leakage hole 222 can be arranged in the area where the reinforcing rib 4 of the second protective plate 22 is located. The specific number and arrangement can be selectively arranged according to design requirements, and there are no restrictions here.

[0047] Furthermore, such as Figure 2 and Figure 3 As shown, the drainage holes 222 arranged in the area where the reinforcing ribs 4 are located can be set at the intersections of the transverse reinforcing ribs 41 and the longitudinal reinforcing ribs 42, or at the intersections of the transverse reinforcing ribs 41, the longitudinal reinforcing ribs 42, and the diagonal reinforcing ribs 43. On the one hand, the structural strength at the intersections is relatively high, and the above arrangement can reduce the impact of the drainage holes 222 on the structural strength of the second guard plate 22; on the other hand, the intersecting reinforcing ribs 4 can act as flow channels, and arranging the drainage holes 222 at the intersections of the flow channels is conducive to the drainage of liquids in rainwater or wading conditions.

[0048] In some embodiments, the first protective plate 21 is a steel plate and the second protective plate 22 is an aluminum alloy plate. This ensures that the bottom protective plate 2 has sufficient structural strength and rigidity to meet the functions of load bearing and protection, and achieves effective shock absorption by deforming and absorbing energy when the bottom is impacted. At the same time, it can also reduce the overall weight of the bottom protective plate 2, achieving lightweighting to a certain extent.

[0049] In some embodiments, the lower surface of at least one of the cooling plate 11, rigid foam 31, first protective plate 21, and second protective plate 22 is coated with a puncture-resistant coating (not shown). The puncture-resistant coating absorbs and disperses impact energy, achieving tear and puncture resistance, thereby further enhancing the protective capability and safety margin of the bottom protective structure.

[0050] It is understandable that puncture-resistant coatings can be made of polyurea, epoxy resin, or nanocomposite coatings. The specific coating type and the object to be coated can be selectively arranged according to the needs of the vehicle model. No restrictions are imposed here and will not be elaborated further.

[0051] Furthermore, in another embodiment, a vehicle is proposed, including the bottom protection structure of the power battery described in the above embodiments. For other structures and working principles of the bottom protection structure of the power battery, please refer to the above description of the embodiments of the bottom protection structure of the power battery; for other structures of the vehicle, please refer to the prior art; since the bottom protection structure of the power battery has the above-mentioned technical effects, the vehicle having this bottom protection structure should also have corresponding technical effects, which will not be elaborated here.

[0052] It is understood that, in this utility model, unless otherwise explicitly specified and limited, the terms "assembly," "connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0053] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. "A plurality of" means two or more, unless otherwise explicitly specified. The terms "some embodiments," "exemplarily," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model.

[0054] The illustrative expressions of the terms used above do not necessarily refer to the same embodiments or examples. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, those skilled in the art can combine and integrate the different embodiments or examples described herein, as well as the features of those different embodiments or examples, without contradiction.

[0055] Although embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, substitutions and variations to the above embodiments within the scope of the present invention. Therefore, any changes or modifications made in accordance with the claims and description of the present invention should fall within the scope of the patent coverage of the present invention.

Claims

1. A bottom protective structure for a power battery, disposed at the bottom of the battery casing, characterized in that, include: A bottom protective plate is spaced apart below the cooling plate of the battery box; and The foam layer, sandwiched between the cooling plate and the bottom protective plate, includes rigid foam and soft foam. The rigid foam and the soft foam are stacked along the height direction, and the soft foam is located on top of the rigid foam.

2. The bottom protective structure of the power battery according to claim 1, characterized in that, The soft foam is interference-fitted with the cooling plate.

3. The bottom protective structure of the power battery according to claim 1 or 2, characterized in that, The bottom protective plate includes: A first protective plate, connected to the battery housing, is adapted to support the foam layer; and The second protective plate is connected to the battery box and is spaced below the first protective plate to form a buffer space between the first protective plate and the second protective plate.

4. The bottom protective structure of the power battery according to claim 3, characterized in that, The buffer space is provided with a buffer pad, and the upper and lower surfaces of the buffer pad are respectively attached to the lower surface of the first protective plate and the upper surface of the second protective plate.

5. The bottom protective structure of the power battery according to claim 3, characterized in that, Both the first protective plate and the second protective plate are detachably connected to the battery box.

6. The bottom protective structure of the power battery according to claim 3, characterized in that, The surface of the first guard plate and / or the second guard plate is further provided with a number of reinforcing ribs, including cross-connected transverse reinforcing ribs, longitudinal reinforcing ribs and diagonal reinforcing ribs.

7. The bottom protective structure of the power battery according to claim 3, characterized in that, The second protective plate is provided with a plurality of leakage holes, which are arranged through the surface of the second protective plate along the height direction.

8. The bottom protective structure of the power battery according to claim 3, characterized in that, The first protective plate is a steel plate, and the second protective plate is an aluminum alloy plate.

9. The bottom protective structure of the power battery according to claim 3, characterized in that, The lower surface of at least one of the cooling plate, rigid foam, first protective plate, and second protective plate is coated with a puncture-resistant coating.

10. A vehicle, characterized in that, Includes a bottom protective structure for a power battery as described in any one of claims 1-9.

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