Bottom plate structure, battery box and battery pack

Abstract

The utility model discloses a bottom plate structure, battery box and battery pack, the bottom plate structure includes: buffer layer structure and support plate, buffer layer structure includes base plate and a plurality of reinforcing rib, the plurality of reinforcing rib is provided on one side face of base plate in the vertical direction, the support plate and buffer layer structure are laminated along the vertical direction, and the support plate and buffer layer structure are laminated along the vertical direction. The ends, away from the base plate, of the reinforcing ribs abut against the supporting plate, a buffer layer structure is arranged on at least one side of the supporting plate in the vertical direction, and the hardness of the supporting plate is larger than that of the buffer layer structure. According to the bottom plate structure disclosed by the utility model, the structural strength of the base plate can be better improved through the plurality of reinforcing ribs so as to improve the anti-deformation strength of the buffer layer structure, and the support plate has higher anti-deformation strength so as to reduce the amplitude of the bottom plate structure invading into the mounting space of the battery module upwards; the sealing failure of the battery pack caused by puncturing the supporting plate after the reinforcing ribs deform can be avoided, so that the protection and sealing effects of the bottom plate structure on the battery module can be improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a base plate structure, a battery box, and a battery pack. Background Technology

[0002] With the rapid development and iteration of the automotive industry, traditional gasoline-powered vehicles are gradually being replaced by new energy vehicles, among which pure electric vehicles are emerging as a type of new energy vehicle. To improve the battery pack's ability to withstand various operating conditions, it is essential to enhance its structural strength. The design of the battery pack structure directly affects its overall safety performance. Specifically, during vehicle operation, when obstacles are present on the road, impacts to the battery pack's base plate can easily cause it to perforate, leading to a failure of the battery pack's sealing performance. Therefore, designing a base plate structure that can prevent perforation has become an urgent problem to be solved. Utility Model Content

[0003] The first aspect of this utility model proposes a base plate structure, which has the advantage of being able to withstand impacts and prevent being punctured.

[0004] According to a first aspect of the present invention, the base plate structure includes: a buffer layer structure, the buffer layer structure including a substrate and a plurality of reinforcing ribs, the plurality of reinforcing ribs being disposed on one side of the substrate in the vertical direction; a support plate, the support plate and the buffer layer structure being stacked in the vertical direction, the end of the reinforcing rib facing away from the substrate abutting against the support plate, the buffer layer structure being disposed on at least one side of the support plate in the vertical direction, and the hardness of the support plate being greater than the hardness of the buffer layer structure.

[0005] According to the base plate structure of the first aspect of this utility model, the structural strength of the substrate can be improved by multiple reinforcing ribs, thereby improving the deformation resistance of the buffer layer structure. The hardness of the support plate is greater than that of the reinforcing ribs, and the support plate has higher deformation resistance, thereby reducing the extent to which the base plate structure intrudes upward into the battery module installation space. At the same time, it can prevent the reinforcing ribs from puncturing the support plate after deformation, which would lead to battery pack sealing failure. This can improve the protection and sealing effect of the base plate structure for the battery module.

[0006] According to some embodiments of this utility model, the support plate is made of steel and the buffer layer structure is made of aluminum.

[0007] According to some embodiments of this utility model, the thickness of the support plate ranges from 1.5 to 2 mm.

[0008] According to some embodiments of the present invention, the reinforcing ribs extend along the width direction of the substrate, and multiple reinforcing ribs are arranged in parallel at intervals along the length direction of the substrate.

[0009] According to some embodiments of the present invention, the ratio of the thickness of the reinforcing rib to the thickness of the substrate is in the range of 1 to 2.

[0010] According to some embodiments of the present invention, the ratio of the thickness of the reinforcing rib to the height of the reinforcing rib is in the range of 1 to 1.5; and / or, the ratio of the spacing between two adjacent reinforcing ribs to the thickness of the reinforcing rib is in the range of 4 to 6.

[0011] According to some embodiments of the present invention, the buffer layer structure is provided on both the upper and lower sides of the support plate.

[0012] The second aspect of this utility model proposes a battery box.

[0013] The battery box according to a second aspect of the present invention includes: the aforementioned base plate structure.

[0014] According to the battery box of the second aspect of the present invention, the structural strength of the substrate can be improved by multiple reinforcing ribs, thereby improving the deformation resistance of the buffer layer structure. The hardness of the support plate is greater than that of the reinforcing ribs, and the support plate has higher deformation resistance, thereby reducing the extent to which the bottom plate structure intrudes upward into the battery module installation space. At the same time, it can prevent the reinforcing ribs from puncturing the support plate after deformation, which would lead to battery pack sealing failure. This can improve the protection and sealing effect of the bottom plate structure for the battery module.

[0015] According to some embodiments of this utility model, the height H of the battery box and the thickness h of the base plate structure satisfy: h=0.1*(1±0.3)*H.

[0016] The third aspect of this utility model proposes a battery pack.

[0017] The battery pack according to a third aspect of the present invention includes: the aforementioned battery box.

[0018] According to the battery pack of the third aspect embodiment of the present invention, the structural strength of the substrate can be improved by multiple reinforcing ribs, thereby improving the deformation resistance of the buffer layer structure. The hardness of the support plate is greater than that of the reinforcing ribs, and the support plate has higher deformation resistance, thereby reducing the extent to which the bottom plate structure intrudes upward into the battery module installation space. At the same time, it can prevent the reinforcing ribs from puncturing the support plate after deformation, which would cause the battery pack to fail to seal. This can improve the protection and sealing effect of the bottom plate structure for the battery module.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] Figure 1This is a schematic diagram of the base plate structure according to an embodiment of the present utility model;

[0021] Figure 2 This is a front view of the base plate structure according to an embodiment of the present utility model;

[0022] Figure 3 yes Figure 2 Enlarged view of region A in the middle;

[0023] Figure 4 This is an exploded view of the battery pack according to an embodiment of the present utility model.

[0024] Figure label:

[0025] 1000, battery pack;

[0026] 100. Battery box; 200. Battery module;

[0027] 10. Base plate structure; 1. Buffer layer structure; 11. Base plate; 12. Reinforcing rib; 2. Support plate; 20. Top cover; 30. Lower box body. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0029] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0030] The base plate structure 10 according to a first aspect embodiment of the present invention is described below with reference to the accompanying drawings.

[0031] like Figures 1 to 3As shown, the base plate structure 10 according to the first aspect embodiment of the present invention includes: a buffer layer structure 1 and a support plate 2. The buffer layer structure 1 includes a base plate 11 and a plurality of reinforcing ribs 12. The plurality of reinforcing ribs 12 are disposed on one side of the base plate 11 in the vertical direction. The support plate 2 and the buffer layer structure 1 are stacked in the vertical direction. The end of the reinforcing rib 12 facing away from the base plate 11 abuts against the support plate 2. The support plate 2 has the buffer layer structure 1 on at least one side in the vertical direction. The hardness of the support plate 2 is greater than the hardness of the buffer layer structure 1.

[0032] In other words, the reinforcing ribs 12 are provided on the side of the substrate 11 facing the support plate 2. Multiple reinforcing ribs 12 can effectively improve the structural strength of the substrate 11, thereby enhancing the deformation resistance of the buffer layer structure 1. Specifically, the buffer layer structure 1 can be provided only on the lower side of the support plate 2, with the lower side of the support plate 2 abutting against the upper end of the reinforcing rib 12 of the lower buffer layer structure 1; or the buffer layer structure 1 can be provided only on the upper side of the support plate 2, with the upper side of the support plate 2 abutting against the lower end of the reinforcing rib 12 of the upper buffer layer structure 1; or the buffer layer structure 1 can be provided on both the upper and lower sides of the support plate 2, with the lower side of the support plate 2 abutting against the upper end of the reinforcing rib 12 of the lower buffer layer structure 1, and the upper side of the support plate 2 abutting against the lower end of the reinforcing rib 12 of the upper buffer layer structure 1.

[0033] Furthermore, it is understood that the battery module 200 of the battery pack 1000 is located on the upper side of the base plate structure 10. Therefore, during vehicle operation, when the base plate structure 10 is impacted, the impact force, in the process of being transmitted to the battery module 200, must pass through at least the support plate 2 and a buffer layer structure 1. Both the buffer layer structure 1 and the support plate 2 can absorb and disperse a portion of the impact force, thereby reducing the transmission of the impact force to the battery module 200. In addition, the hardness of the support plate 2 is greater than that of the reinforcing rib 12, and the support plate 2 has higher resistance to deformation, thereby reducing the extent to which the base plate structure 10 intrudes upward into the installation space of the battery module 200. At the same time, it can prevent the reinforcing rib 12 from deforming and puncturing the support plate 2, causing the battery pack 1000 to fail to seal, thus improving the protection and sealing effect of the base plate structure 10 on the battery module 200.

[0034] According to the first aspect embodiment of the present invention, the base plate structure 10 can effectively improve the structural strength of the substrate 11 through multiple reinforcing ribs 12, thereby improving the deformation resistance of the buffer layer structure 1. The hardness of the support plate 2 is greater than that of the reinforcing ribs 12, and the support plate 2 has higher deformation resistance, thereby reducing the extent to which the base plate structure 10 intrudes upward into the battery module 200 installation space. At the same time, it can prevent the reinforcing ribs 12 from puncturing the support plate 2 after deformation, which would cause the battery pack 1000 to fail to seal. Thus, the protection and sealing effect of the base plate structure 10 on the battery module 200 can be improved.

[0035] According to some embodiments of this utility model, the support plate 2 is made of steel, and the buffer layer structure 1 is made of aluminum. Steel has high hardness and is not easily deformed, which can improve the structural strength and deformation resistance of the support plate 2; aluminum has excellent structural strength while being lightweight, thus reducing the weight of the buffer layer structure 1. Therefore, the weight of the bottom structure can be reduced while improving the base plate structure 10, thereby improving the protective effect of the battery box 100 on the battery module 200 and the lightweight level of the battery pack 1000.

[0036] According to some embodiments of this utility model, the thickness of the support plate 2 ranges from 1.5 to 2 mm. That is, the vertical dimension of the support plate 2 is controlled within the range of 1.5 mm to 2 mm. It is understood that the thicker the support plate 2, the higher its structural strength, but the heavier and more expensive it becomes; conversely, the thinner the support plate 2, the lighter and cheaper it is, but the lower its structural strength. Therefore, by controlling the thickness of the support plate 2 within the range of 1.5 mm to 2 mm, it is possible to avoid the support plate 2 being too thick, increasing its weight and production cost, while also avoiding the support plate 2 being too thin, resulting in insufficient structural strength. Thus, it is possible to control the weight and cost of the support plate 2 while ensuring its structural strength. The thickness of the support plate 2 can be 1.5mm, 1.55mm, 1.6mm, 1.65mm, 1.7mm, 1.75mm, 1.8mm, 1.85mm, 1.9mm, 1.95mm, 2mm, etc., and no specific restrictions are imposed here.

[0037] According to some embodiments of this utility model, the reinforcing ribs 12 extend along the width direction of the substrate 11, and multiple reinforcing ribs 12 are arranged parallel and spaced apart along the length direction of the substrate 11. It is understood that when the battery pack 1000 is installed on a vehicle body, its length direction is typically arranged in a front-to-back direction. During vehicle movement, obstacles typically impact the base plate structure 10 from front to back. Therefore, when the buffer layer structure 1 located below the support plate 2 experiences a rearward impact, the reinforcing ribs 12 extending along the width direction of the substrate 11 can bend and deform rearward relative to the substrate 11 to absorb the impact force. This prevents the reinforcing ribs 12 from bending upward and impacting the support plate 2, thereby reducing the risk of the reinforcing ribs 12 puncturing the support plate 2 and improving the sealing and protective performance of the battery box 100.

[0038] According to some embodiments of this utility model, the ratio of the thickness of the reinforcing rib 12 to the thickness of the substrate 11 ranges from 1 to 2. That is, the thickness of the reinforcing rib 12 is controlled within a range that is not less than the thickness of the substrate 11 and does not exceed twice the thickness of the substrate 11. It should be noted that the thickness direction of the reinforcing rib 12 is perpendicular to the vertical direction and perpendicular to the length direction of the reinforcing rib 12, and the thickness direction of the substrate 11 is perpendicular to the vertical direction. It can be understood that, based on a fixed thickness of the substrate 11, the smaller the thickness ratio of the reinforcing rib 12 to the substrate 11, the smaller the thickness of the reinforcing rib 12, the lower the weight and processing cost of the reinforcing rib 12, but the fewer the connection points between the reinforcing rib 12 and the substrate 11, and the worse the reinforcing effect of the reinforcing rib 12 on the substrate 11; conversely, the larger the thickness ratio of the reinforcing rib 12 to the substrate 11, the larger the thickness of the reinforcing rib 12, the more connection points between the reinforcing rib 12 and the substrate 11, and the stronger the reinforcing effect of the reinforcing rib 12 on the substrate 11, but the lower the weight and processing cost of the reinforcing rib 12.

[0039] Therefore, by controlling the thickness ratio of the reinforcing rib 12 to the substrate 11 within the range of 1 to 2, it is possible to avoid the reinforcing effect of the reinforcing rib 12 on the structural strength of the substrate 11 being too weak if the thickness of the reinforcing rib 12 is too small. At the same time, it is possible to avoid the reinforcing rib 12 being too strong, which would increase its weight and processing cost. Thus, the strength of the buffer layer structure 1 can be guaranteed while controlling its weight and processing cost. The thickness ratio of the reinforcing rib 12 to the substrate 11 can be 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, etc., and no specific limitation is made here.

[0040] According to some embodiments of this utility model, the ratio of the thickness to the height of the reinforcing rib 12 ranges from 1 to 1.5. It should be noted that the thickness direction of the reinforcing rib 12 is perpendicular to the vertical direction and the length direction, while the height direction is vertical, i.e., the height by which the reinforcing rib 12 protrudes from the substrate 11. It can be understood that, based on a fixed height of the reinforcing rib 12, a smaller ratio of the thickness to the height of the reinforcing rib 12 results in a thinner reinforcing rib 12, lower weight and processing cost, but fewer connection points between the reinforcing rib 12 and the substrate 11, leading to a weaker reinforcing effect. Conversely, a larger ratio of the thickness to the height of the reinforcing rib 12 results in a thicker reinforcing rib 12, more connection points between the reinforcing rib 12 and the substrate 11, stronger reinforcing effect, but lower weight and processing cost.

[0041] Therefore, by controlling the ratio of the thickness to the height of the reinforcing rib 12 within the range of 1 to 1.5, it is possible to avoid the reinforcing rib 12 being too thin, which would weaken its strengthening effect on the structural strength of the substrate 11. At the same time, it is possible to avoid the reinforcing rib 12 being too thick, which would increase its weight and processing cost. Thus, while ensuring the strength of the buffer layer structure 1, the weight and processing cost of the buffer layer structure 1 can be controlled. The thickness ratio of the reinforcing rib 12 to the substrate 11 can be 1, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, 1.5, etc., and no specific limitation is imposed here.

[0042] According to some embodiments of this utility model, the spacing between two adjacent reinforcing ribs 12 (e.g.) Figure 3 The dimensions of a) and the thickness of the reinforcing rib 12 (as mentioned in the text) Figure 3 The ratio of t3 shown is in the range of 4 to 6. It should be noted that the spacing between two adjacent reinforcing ribs 12 refers to the distance between the centers of two adjacent reinforcing ribs 12 in the thickness direction. It can be understood that the ratio of the spacing between two adjacent reinforcing ribs 12 to the thickness of the reinforcing rib 12 indicates the sparseness of the reinforcing ribs 12. Specifically, the larger the ratio, the greater the distance between two connected reinforcing ribs 12, the sparser the arrangement of multiple reinforcing ribs 12, the lower the weight and processing cost of the reinforcing ribs 12, but the weaker the strengthening effect of multiple reinforcing ribs 12 on the structural strength of the substrate 11. Conversely, the smaller the ratio, the closer the distance between two connected reinforcing ribs 12, the denser the arrangement of multiple reinforcing ribs 12, the stronger the strengthening effect of multiple reinforcing ribs 12 on the structural strength of the substrate 11, but the lower the weight and processing cost of the reinforcing ribs 12.

[0043] Therefore, by controlling the ratio of the spacing between two adjacent reinforcing ribs 12 to the thickness of the reinforcing rib 12 within the range of 4 to 6, it is possible to avoid the reinforcing effect on the structural strength of the substrate 11 being too sparse, while avoiding the increase in weight and processing cost due to excessively dense reinforcing ribs 12. This allows for the control of the weight and cost of the buffer layer structure 1 while improving its strength. The ratio of the spacing between two adjacent reinforcing ribs 12 to the thickness of the reinforcing rib 12 can be 4, 4.2, 4.5, 4.8, 5, 5.2, 5.5, 5.8, 6, etc., and no specific limitation is imposed here.

[0044] According to some embodiments of this utility model, buffer layer structures 1 are provided on both the upper and lower sides of the support plate 2. That is, the lower surface of the support plate 2 abuts against the upper end of the reinforcing rib 12 of the lower buffer layer structure 1, and the upper surface of the support surface abuts against the lower end of the reinforcing rib 12 of the upper buffer layer structure 1. It can be understood that the battery module 200 is placed on the upper side of the upper buffer layer structure 1. When the lower buffer layer structure 1 is impacted, it can absorb part of the impact force through deformation of the lower buffer layer structure 1, thereby reducing the transmission of the impact force to the support plate 2. Since the support plate 2 has high hardness, the deformation range of the support plate 2 can be reduced, thereby reducing the impact force of the support plate 2 acting on the upper buffer layer structure 1. Furthermore, the buffer layer structure 1 can further absorb the impact force, thereby reducing the transmission of the impact force to the battery module 200. Therefore, through the cooperation of the two buffer layer structures 1 and the support plate 2, the protective effect of the base plate structure 10 on the battery module 200 can be improved.

[0045] In a specific example, the buffer layer structure 1 located on the upper and lower sides is symmetrically arranged relative to the support plate 2, so that the reinforcing ribs 12 on the upper and lower sides can be arranged opposite each other in the vertical direction, forming a continuous force transmission path, so as to avoid the force from concentrating at the contact position between the support plate 2 and the reinforcing ribs 12, thereby avoiding stress concentration from puncturing the support plate 2 and improving the sealing performance of the base plate structure 10.

[0046] The battery box 100 according to a second aspect embodiment of the present invention is described below with reference to the accompanying drawings.

[0047] According to a second aspect of the present invention, a battery box 100 includes a base plate structure 10.

[0048] According to the battery box 100 of the second aspect of the present invention, the structural strength of the substrate 11 can be improved by multiple reinforcing ribs 12, thereby improving the deformation resistance of the buffer layer structure 1. The hardness of the support plate 2 is greater than that of the reinforcing ribs 12, and the support plate 2 has higher deformation resistance, thereby reducing the extent to which the bottom plate structure 10 intrudes upward into the battery module 200 installation space. At the same time, it can prevent the reinforcing ribs 12 from puncturing the support plate 2 after deformation, which would cause the battery pack 1000 to fail to seal. This can improve the protection and sealing effect of the bottom plate structure 10 on the battery module 200.

[0049] like Figure 4 As shown, in a specific example, the battery box 100 also includes an upper cover 20 and a lower box 30. The upper cover 20 and the bottom plate structure 10 are respectively disposed at the upper and lower ends of the lower box 30, so that the upper cover 20, the lower box 30 and the bottom plate structure 10 can jointly define a sealed space for accommodating the battery module 200.

[0050] According to some embodiments of this utility model, the height H of the battery box 100 and the thickness h of the base plate structure 10 satisfy: h = 0.1*(1±0.3)*H. That is, the ratio of the thickness of the base plate structure 10 to the height of the battery box 100 is controlled between 0.07 and 0.13. With the height of the battery box 100 fixed, the smaller the ratio of the thickness of the base plate structure 10 to the height of the battery box 100, the larger the thickness of the base plate structure 10, resulting in higher structural strength, but also more space occupied, heavier weight, and higher cost; conversely, the larger the ratio of the thickness of the base plate structure 10 to the height of the battery box 100, the more space the base plate structure 10 occupies, the heavier weight, and the higher cost, but the lower the structural strength. Therefore, by controlling the ratio of the thickness of the base plate structure 10 to the height of the battery box 100 between 0.07 and 0.13, it is possible to avoid the overall thickness of the base plate structure 10 being too small, which would affect its structural strength, while also avoiding the overall thickness of the base plate structure 10 being too large, which would increase the space occupied, weight, and production costs. The ratio of the thickness of the base plate structure 10 to the height of the battery box 100 can be 0.07, 0.08, 0.09, 0.1, 0.11, 0.12, 0.13, etc., and no specific limitation is imposed here.

[0051] The battery pack 1000 according to a third aspect embodiment of the present invention is described below with reference to the accompanying drawings.

[0052] According to a third aspect embodiment of the present invention, a battery pack 1000 includes a battery case 100. The battery case 100 can effectively accommodate the battery module 200 and liquid cooling plates of the battery pack 1000. The battery case 100 has good structural strength and sealing performance, thereby improving the protection of the battery module 200.

[0053] According to the battery pack 1000 of the third aspect embodiment of the present invention, the structural strength of the substrate 11 can be improved by multiple reinforcing ribs 12, thereby improving the deformation resistance of the buffer layer structure 1. The hardness of the support plate 2 is greater than that of the reinforcing ribs 12, and the support plate 2 has higher deformation resistance, thereby reducing the extent to which the bottom plate structure 10 intrudes upward into the battery module 200 installation space. At the same time, it can prevent the reinforcing ribs 12 from puncturing the support plate 2 after deformation, which would cause the battery pack 1000 to fail to seal. This can improve the protection and sealing effect of the bottom plate structure 10 on the battery module 200.

[0054] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," 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 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. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0055] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," 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 the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0056] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A base plate structure for a battery box, characterized in that, include: A buffer layer structure, the buffer layer structure including a substrate and a plurality of reinforcing ribs, the plurality of reinforcing ribs being disposed on one side of the substrate in the vertical direction; A support plate is provided, wherein the support plate and the buffer layer structure are stacked in the vertical direction, and the end of the reinforcing rib facing away from the substrate abuts against the support plate. The buffer layer structure is provided on at least one side of the support plate in the vertical direction, and the hardness of the support plate is greater than the hardness of the buffer layer structure.

2. The base plate structure according to claim 1, characterized in that, The support plate is made of steel, and the buffer layer structure is made of aluminum.

3. The base plate structure according to claim 1, characterized in that, The thickness of the support plate ranges from 1.5 to 2 mm.

4. The base plate structure according to claim 1, characterized in that, The reinforcing ribs extend along the width direction of the substrate, and multiple reinforcing ribs are arranged in parallel at intervals along the length direction of the substrate.

5. The base plate structure according to claim 1, characterized in that, The ratio of the thickness of the reinforcing rib to the thickness of the substrate is in the range of 1 to 2.

6. The base plate structure according to claim 1, characterized in that, The ratio of the thickness of the reinforcing rib to the height of the reinforcing rib is in the range of 1 to 1.5; and / or, the ratio of the spacing between two adjacent reinforcing ribs to the thickness of the reinforcing rib is in the range of 4 to 6.

7. The base plate structure according to claim 1, characterized in that, The buffer layer structure is provided on both the upper and lower sides of the support plate.

8. A battery box, characterized in that, include: The base plate structure according to any one of claims 1-7.

9. The battery box according to claim 8, characterized in that, The height H of the battery box and the thickness h of the base plate structure satisfy: h=0.1*(1±0.3)*H.

10. A battery pack, characterized in that, include: The battery box according to claim 8 or 9.

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