Bottom protection plate and battery pack

Abstract

The utility model discloses a bottom guard plate and a battery pack, the bottom guard plate is used for the battery pack, the bottom guard plate comprises a bottom guard plate body and a support rib, a cavity is formed in the bottom guard plate body, and the bottom guard plate body comprises a first plate body and a second plate body which are mutually overlapped along a first direction; the first plate body and the second plate body are spaced in the first direction to form a cavity; the multiple supporting ribs are elastically supported in the cavity, the two ends, in the first direction, of each supporting rib are fixedly connected with the first plate body and the second plate body correspondingly, the multiple supporting ribs are arranged in the second direction at intervals, and the first direction is perpendicular to the second direction. According to the bottom protection plate disclosed by the utility model, the plurality of supporting ribs are arranged between the first plate body and the second plate body, so that the bottom protection plate body is effectively prevented from being deformed, and the battery pack can be better supported and protected; and the plurality of supporting ribs can also absorb and buffer the impact force on the bottom protection plate, so that the direct impact of external force on the battery pack is reduced, and the safety of the battery pack is improved.

Description

Technical Field

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

[0002] In related technologies, the impact resistance of the bottom protective plate of the battery pack directly affects crucial parameters such as the battery pack's lifespan and thermal management safety. The bottom of the battery pack is sealed with a single-layer protective plate, which lacks sufficient impact resistance. To improve the impact resistance, the thickness of the bottom protective plate is increased. While these methods can improve the impact resistance to some extent, they also lead to increased battery pack cost and weight. Utility Model Content

[0003] This utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this utility model is to provide a bottom protective plate, in which multiple supporting ribs are provided between the first plate and the second plate, effectively preventing deformation of the bottom protective plate body, thereby better supporting and protecting the battery pack, while also reducing the weight and cost of the bottom protective plate.

[0004] This utility model also proposes a battery pack having the aforementioned bottom protective plate.

[0005] According to a first aspect of the present invention, a bottom protective plate is used for a battery pack. The bottom protective plate includes: a bottom protective plate body, a cavity formed within the bottom protective plate body, the bottom protective plate body including a first plate and a second plate stacked together along a first direction, and the first plate and the second plate being spaced apart along the first direction to form the cavity; and a plurality of support ribs, the plurality of support ribs being elastically supported within the cavity, and each support rib having its two ends along the first direction fixedly connected to the first plate and the second plate respectively, the plurality of support ribs being spaced apart along a second direction, the first direction being perpendicular to the second direction.

[0006] According to the embodiment of the present invention, the bottom protective plate has multiple supporting ribs in its cavity. These supporting ribs are elastically supported between the first plate and the second plate, which makes the connection between the first plate and the second plate more stable and effectively prevents the bottom protective plate from deforming. This allows for better support and protection of the battery pack, while also reducing the weight and cost of the bottom protective plate. The multiple supporting ribs can absorb and buffer the impact force on the bottom protective plate, reducing the direct impact of external forces on the battery pack and improving the safety of the battery pack.

[0007] According to some embodiments of the present invention, a plurality of the supporting ribs extend along a third direction and penetrate the cavity, wherein the first direction, the second direction, and the third direction are perpendicular to each other.

[0008] According to some embodiments of the present invention, the shape constructed by the projection of the supporting rib onto the third direction is at least one of a polygon or an arc.

[0009] According to some embodiments of the present invention, the thickness of the battery pack in the first direction is H, and the thickness of the bottom protective plate body in the first direction is h, satisfying: 0.07H≤h≤0.13H; the thickness of the first plate and the second plate in the first direction is t, satisfying: 1.5mm≤t≤2mm.

[0010] According to some embodiments of this utility model, the supporting rib is a hollow cylinder, the radius of the outer wall of the hollow cylinder is R1, satisfying: R1=(h-2*t) / 2, the radius of the inner wall of the hollow cylinder is r1, the wall thickness of the hollow cylinder is t1, satisfying: t1=R1-r1, 1.5mm≤t1≤2mm; the distance between two adjacent hollow cylinders is a1, satisfying: 4R1≤a1≤6R1.

[0011] According to some embodiments of the present invention, the supporting rib is constructed as an arc-shaped plate arranged around the straight line containing the third direction, and the central angle of the arc-shaped plate is 180°.

[0012] According to some embodiments of the present invention, both ends of the arc-shaped plate abut against the first plate or the second plate.

[0013] According to some embodiments of the present invention, the openings of the plurality of arc-shaped plates are all oriented toward the first plate body and / or the second plate body.

[0014] According to some embodiments of this utility model, the radius of the outer side wall of the arc-shaped plate is R2, satisfying: R2=h-2*t; the radius of the inner side wall of the arc-shaped plate is r2; the wall thickness of the arc-shaped plate is t2, satisfying: t2=R2-r2, 1.5mm≤t2≤2mm; the distance between two adjacent arc-shaped plates is a2, satisfying: 4R2≤a2≤6R2.

[0015] A battery pack according to a second aspect of the present invention includes: a bottom protective plate according to the first aspect of the present invention described above.

[0016] According to the embodiments of the present invention, the battery pack, by setting the bottom protective plate, effectively prevents the bottom protective plate body from deforming, thereby better supporting and protecting the battery pack; multiple support ribs can absorb and buffer the impact force received by the bottom protective plate, reduce the direct impact of external forces on the battery pack, and improve the safety of the battery pack.

[0017] 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

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic diagram of a battery pack according to some embodiments of the present invention;

[0020] Figure 2 This is a schematic diagram of the bottom protective plate according to the first aspect embodiment of the present utility model;

[0021] Figure 3 yes Figure 2 Cross-sectional view of the midsole support plate;

[0022] Figure 4 yes Figure 3 Enlarged view of point A in the middle;

[0023] Figure 5 This is a schematic diagram of the bottom protective plate according to the second aspect embodiment of the present utility model;

[0024] Figure 6 yes Figure 5 Cross-sectional view of the midsole support plate;

[0025] Figure 7 yes Figure 6 Enlarged view of point B in the middle.

[0026] Figure label:

[0027] 100. Battery pack;

[0028] 11. Housing; 12. Battery module; 13. Top cover;

[0029] 20. Bottom protective plate; 2. Bottom protective plate body; 21. First plate; 22. Second plate; 23. Third plate; 24. Fourth plate; 25. Cavity;

[0030] 3. Supporting ribs; 31. Hollow cylinder; 32. Curved plate. Detailed Implementation

[0031] 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 are only used to explain this utility model, and should not be construed as limiting this utility model.

[0032] In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for 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. 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. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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.

[0034] The following is for reference. Figures 1-7 Description of the bottom protective plate 20 according to an embodiment of the present utility model.

[0035] According to the first aspect of the present invention, the bottom protective plate 20 is used for the battery pack 100. The battery pack 100 includes a housing 11, a battery module 12 is provided inside the housing 11, and the battery pack 100 also includes a top cover 13, which covers the opening of the housing 11 and is used to close the housing 11. The bottom protective plate 20 is also provided below the housing 11. The bottom protective plate 20 is used to protect the housing 11 and ensure the battery pack 100's ability to withstand ball impacts, scraping, and sealing.

[0036] The bottom guard plate 20 includes a bottom guard plate body 2 and a supporting rib 3. A cavity 25 is formed inside the bottom guard plate body 2. The bottom guard plate body 2 includes a cavity along a first direction (e.g., see attached diagram). Figure 3 The first plate 21 and the second plate 22 are stacked on each other in the e1 direction (equivalent to the vertical direction of the battery pack 100), and the first plate 21 and the second plate 22 are spaced apart along the first direction to form a cavity 25.

[0037] For example, the bottom guard plate body 2 also includes a third plate 23 and a fourth plate 24, which are respectively connected to the first plate 21 and the second plate 22 along the second direction (see attached figure). Figure 2 At both ends of the e2 direction, the bottom guard plate 20 is an integrally formed part, and the first plate 21, the second plate 22, the third plate 23 and the fourth plate 24 surround the cavity 25.

[0038] Multiple support ribs 3 are provided, and the multiple support ribs 3 are elastically supported in the cavity 25. Each support rib 3 is fixedly connected to the first plate 21 and the second plate 22 at both ends along the first direction. The multiple support ribs 3 are arranged at intervals along the second direction, and the first direction is perpendicular to the second direction. The multiple support ribs 3 can support the first plate 21 and the second plate 22, and can also make the connection between the first plate 21 and the second plate 22 more stable, effectively preventing the bottom protective plate body 2 from deforming, thereby better supporting and protecting the battery pack 100.

[0039] Multiple support ribs 3 are elastically supported in the cavity 25. When the bottom of the battery pack 100 is hit by a ball or scraped, the support ribs 3 in the bottom guard plate 20 can undergo elastic deformation in the cavity 25 to absorb and buffer the impact force on the bottom guard plate 20, reduce the direct impact of external forces on the battery pack 100, and improve the safety of the battery pack 100.

[0040] According to the embodiment of the present invention, the bottom protective plate 20 has a plurality of supporting ribs 3 in the cavity 25 of the bottom protective plate body 2. The plurality of supporting ribs 3 are elastically supported between the first plate 21 and the second plate 22, which can make the connection between the first plate 21 and the second plate 22 more stable, effectively prevent the bottom protective plate body 2 from deforming, thereby better supporting and protecting the battery pack 100, and at the same time reducing the weight and cost of the bottom protective plate 20. The plurality of supporting ribs 3 can absorb and buffer the impact force received by the bottom protective plate 20, reduce the direct impact of external forces on the battery pack 100, and improve the safety of the battery pack 100.

[0041] According to some embodiments of this utility model, refer to Figures 1-2 , Figure 5 Multiple supporting ribs 3 are all along a third direction (for example, refer to Appendix). Figure 3 The support ribs 3 extend in the e3 direction and penetrate the cavity 25. Multiple support ribs 3 can penetrate the entire cavity 25 in the third direction, further enhancing the buffering and support capabilities of the support ribs 3.

[0042] The first direction, the second direction, and the third direction are perpendicular to each other.

[0043] The first direction is the vertical direction of the bottom guard plate 20, the second direction is the width direction of the bottom guard plate 20, and the third direction is the length direction of the bottom guard plate 20.

[0044] According to some embodiments of this utility model, refer to Figures 1-3 , Figures 5-6 The shape constructed by the projection of the support rib 3 in the third direction is at least one of a polygon or an arc. Both the polygon and the arc are hollow structures and can have compression space in the first direction. When the bottom guard plate 20 is subjected to external impact, it can absorb the impact force through the deformation of the polygon and arc structures.

[0045] Optionally, the shape constructed by the projection of the support rib 3 in the third direction can be a polygon, which can be a quadrilateral, pentagon or regular hexagon, etc. The sides of the polygon can be connected to the first plate 21 and the second plate 22 respectively, which can increase the connection area between the support rib 3 and the first plate 21 and the second plate 22, thereby increasing the connection strength between the support rib 3 and the first plate 21 and the second plate 22.

[0046] Optionally, the shape constructed by the projection of the support rib 3 in the third direction can be an arc, which can be a circle or an arc segment, etc.

[0047] Optionally, the shape constructed by the projection of the support rib 3 in the third direction can be a polygon or an arc, or the polygon and arc can be arranged alternately.

[0048] According to some embodiments of this utility model, refer to Figure 1 , Figure 4 and Figure 7 The thickness of the battery pack 100 in the first direction is H, and the thickness of the bottom protective plate body 2 in the first direction is h, satisfying: 0.07H≤h≤0.13H. The thickness h of the bottom protective plate body 2 is positively correlated with the thickness H of the battery pack 100 in the first direction. The greater the thickness of the battery pack 100 in the first direction, the greater the thickness of the bottom protective plate body 2 in the first direction. The thickness h of the bottom protective plate body 2 in the first direction satisfies the above relationship, which can ensure the structural strength of the bottom protective plate body 2 in supporting the battery pack 100 without occupying too much internal space of the battery pack 100.

[0049] For example, the thickness H of the battery pack 100 in the first direction can be between 150mm and 300mm. When the thickness of the battery pack 100 in the first direction is 150mm, the thickness h of the bottom protective plate body 2 in the first direction can be between 10.5mm and 19.5mm. Specifically, the thickness h of the bottom protective plate body 2 in the first direction can be 11mm, 13mm, 15mm, or 19mm, etc. When the thickness H of the battery pack 100 in the first direction is 300mm, the thickness h of the bottom protective plate body 2 in the first direction can be between 21mm and 39mm. Specifically, the thickness h of the bottom protective plate body 2 in the first direction can be 22mm, 25mm, 30mm, or 38mm, etc.

[0050] The thickness of both the first plate 21 and the second plate 22 in the first direction is t, satisfying 1.5mm≤t≤2mm. This reduces costs while maintaining the structural strength of the bottom protective plate body 2. For example, the thickness t of both the first plate 21 and the second plate 22 in the first direction can be 1.5mm, 1.7mm, 1.9mm, or 2mm, etc.

[0051] According to some embodiments of this utility model, refer to Figures 2-4 The support rib 3 is a hollow cylinder 31, which allows the support rib 3 to have compression space in the first direction. When the bottom guard plate 20 is subjected to external impact, the impact force is absorbed by the deformation of the hollow cylinder 31, reducing the direct impact of external force on the battery pack 100.

[0052] The radius of the outer wall of the hollow cylinder 31 is R1, which satisfies: R1=(h-2*t) / 2. The thickness of the bottom protective plate body 2 in the first direction is h. The thickness of the first plate 21 and the second plate 22 in the first direction is t. The radius of the outer wall of the hollow cylinder 31 is R1, which satisfies: R1=(h-2*t) / 2. That is, the two sides of the hollow cylinder 31 along the first direction respectively abut against the side of the first plate 21 and the second plate 22 facing the cavity 25, so that the hollow cylinder 31 can be supported between the first plate 21 and the second plate 22.

[0053] For example, when the thickness H of the battery pack 100 in the first direction is 150 mm, the thickness h of the bottom protective plate body 2 in the first direction is between 10.5 mm and 19.5 mm, the thickness t of the first plate 21 and the second plate 22 in the first direction is 1.5 mm, and the radius R1 of the outer wall of the hollow cylinder 31 is between 3.75 mm and 8.25 mm. Specifically, the radius R1 of the outer wall of the hollow cylinder 31 can be 4 mm, 6 mm, or 8 mm, etc.

[0054] For example, when the thickness H of the battery pack 100 in the first direction is 300mm, the thickness h of the bottom protective plate body 2 in the first direction is between 21mm and 39mm, the thickness t of the first plate 21 and the second plate 22 in the first direction is 2.0mm, and the radius R1 of the outer wall of the hollow cylinder 31 is between 8.5mm and 17.5mm. Specifically, the radius R1 of the outer wall of the hollow cylinder 31 can be 9mm, 15mm, or 17mm, etc.

[0055] The radius of the inner wall of the hollow cylinder 31 is r1, and the wall thickness of the hollow cylinder 31 is t1, satisfying: t1=R1-r1, 1.5mm≤t1≤2mm. The wall thickness of the hollow cylinder 31 is between 1.5mm and 2mm. The wall thickness of the hollow cylinder 31 is neither too thin nor too thick, so that the hollow cylinder 31 can be supported between the first plate 21 and the second plate 22, and also allows the hollow cylinder 31 to have compression space.

[0056] For example, when the radius R1 of the outer wall of the hollow cylinder 31 is between 3.75 mm and 8.25 mm, and the wall thickness t1 of the hollow cylinder 31 is 1.5 mm, the radius r1 of the inner wall of the hollow cylinder 31 can be between 2.25 mm and 6.75 mm. Specifically, the radius r1 of the inner wall of the hollow cylinder 31 can be 3 mm, 5 mm, or 6 mm, etc. When the radius R1 of the outer wall of the hollow cylinder 31 is between 8.5 mm and 17.5 mm, and the wall thickness t2 of the hollow cylinder 31 is 2.0 mm, the radius r1 of the inner wall of the hollow cylinder 31 can be between 6.5 mm and 15.5 mm. Specifically, the radius r1 of the inner wall of the hollow cylinder 31 can be 7 mm, 10 mm, or 15 mm, etc.

[0057] The distance between two adjacent hollow cylinders 31 is a1, which satisfies: 4a1≤R1≤6a1. This satisfies the requirement of both cost-effectiveness and structural strength. For example, when the radius R1 of the outer wall of the hollow cylinder 31 is 3.75mm, the distance a1 between two adjacent hollow cylinders 31 can be between 15mm and 22.5mm. Specifically, the distance a1 between two adjacent hollow cylinders 31 can be 15mm, 20mm, or 22mm, etc. When the radius R1 of the outer wall of the hollow cylinder 31 is 17.5mm, the distance a1 between two adjacent hollow cylinders 31 can be between 70mm and 105mm. Specifically, the distance a1 between two adjacent hollow cylinders 31 can be 70mm, 80mm, or 100mm, etc.

[0058] According to some embodiments of this utility model, refer to Figure 5-Figure 7The supporting rib 3 is constructed as an arc-shaped plate 32 arranged around the straight line in the third direction. The central angle of the arc-shaped plate 32 is 180°, and the arc-shaped plate 32 also has elastic contraction space in the first direction.

[0059] According to some embodiments of this utility model, refer to Figure 5-Figure 7 Both ends of the curved plate 32 abut against either the first plate 21 or the second plate 22. When both ends of the curved plate 32 abut against the first plate 21, the connection area between the curved plate 32 and the first plate 21 is increased, thereby increasing the connection strength between the curved plate 32 and the first and second plate 22. When both ends of the curved plate 32 abut against the second plate 22, the connection area between the curved plate 32 and the second plate 22 is increased, thereby increasing the connection strength between the curved plate 32 and the first and second plate 21.

[0060] According to some embodiments of this utility model, refer to Figure 5-Figure 7 The openings of the multiple arc-shaped plates 32 all face the first plate 21 and / or the second plate 22. The openings of the multiple arc-shaped plates 32 all face the first plate 21, or the openings of the multiple arc-shaped plates 32 all face the second plate 22, or some of the arc-shaped plates 32 have openings facing the first plate 21 and the remaining arc-shaped plates 32 have openings facing the second plate 22. This can increase the connection strength between the multiple arc-shaped plates 32 and the first plate 21 or the second plate 22.

[0061] According to some embodiments of this utility model, refer to Figure 5-Figure 7 The radius of the outer wall of the arc plate 32 is R2, which satisfies: R2 = h - 2 * t. The thickness of the bottom protective plate body 2 in the first direction is h. The thickness of the first plate 21 and the second plate 22 in the first direction is t. The radius of the outer wall of the arc plate 32 is R2, which satisfies: R2 = h - 2 * t. That is, the two sides of the arc plate 32 along the first direction respectively abut against the side of the first plate 21 and the second plate 22 facing the cavity 25, so that the arc plate 32 can be supported between the first plate 21 and the second plate 22.

[0062] For example, when the thickness H of the battery pack 100 in the first direction is 150 mm, the thickness h of the bottom protective plate body 2 in the first direction can be between 10.5 mm and 19.5 mm, the thickness t of the first plate 21 and the second plate 22 in the first direction is 1.5 mm, and the radius R2 of the outer wall of the arc plate 32 is between 7.5 mm and 16.5 mm. Specifically, the radius R2 of the outer wall of the hollow cylinder 31 can be 8 mm, 12 mm or 16 mm, etc.

[0063] For example, when the thickness H of the battery pack 100 in the first direction is 300mm, the thickness h of the bottom protective plate body 2 in the first direction can be between 21mm and 39mm, the thickness t of the first plate 21 and the second plate 22 in the first direction is 2.0mm, and the radius R2 of the outer wall of the arc plate 32 is between 17mm and 35mm. Specifically, the radius R1 of the outer wall of the hollow cylinder 31 can be 18mm, 25mm or 30mm, etc.

[0064] The radius of the inner wall of the arc plate 32 is r2, and the wall thickness of the arc plate 32 is t2, satisfying t2=R2-r2, 1.5mm≤t2≤2mm. The wall thickness of the arc plate 32 is between 1.5mm and 2mm. The wall thickness of the arc plate 32 is neither too thin nor too thick, so that the arc plate 32 can be supported between the first plate 21 and the second plate 22, and also allows the arc plate 32 to have compression space.

[0065] For example, when the radius R2 of the outer wall of the arc plate 32 is between 7.5mm and 16.5mm, and the wall thickness t2 of the arc plate 32 is 1.5mm, the radius r2 of the inner wall of the arc plate 32 can be between 6mm and 15mm. Specifically, the radius r2 of the inner wall of the arc plate 32 can be 6mm, 10mm, or 15mm, etc. When the radius R2 of the outer wall of the arc plate 32 is between 17mm and 35mm, and the wall thickness t2 of the arc plate 32 is 2.0mm, the radius r2 of the inner wall of the arc plate 32 can be between 15mm and 33mm. Specifically, the radius r2 of the inner wall of the arc plate 32 can be 17mm, 25mm, or 30mm, etc.

[0066] The spacing between two adjacent curved plates 32 is a2, satisfying: 4a2≤R2≤6a2, which can save costs while meeting the support strength of the hollow cylinder 31. When the radius R2 of the outer wall of the curved plate 32 is 7.5mm, the spacing a2 between two adjacent curved plates 32 can be between 30mm and 45mm. Specifically, the spacing a2 between two adjacent curved plates 32 can be 30mm, 40mm, or 45mm, etc. When the radius R2 of the outer wall of the curved plate 32 is 35mm, the spacing a2 between two adjacent curved plates 32 can be between 140mm and 210mm. Specifically, the spacing a2 between two adjacent curved plates 32 can be 140mm, 180mm, or 210mm, etc.

[0067] The battery pack 100 according to a second aspect embodiment of the present invention includes: a bottom protective plate 20 according to the first aspect embodiment of the present invention.

[0068] According to the embodiment of the present utility model, the battery pack 100, by setting the bottom guard plate 20, effectively prevents the bottom guard plate body 2 from deforming, thereby better supporting and protecting the battery pack 100; the multiple support ribs 3 can absorb and buffer the impact force received by the bottom guard plate 20, reduce the direct impact of external forces on the battery pack 100, and improve the safety of the battery pack 100.

[0069] In the description of this specification, references to terms such as "some embodiments," "optionally," "furthermore," 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.

[0070] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A bottom protective plate, characterized in that, For use with a battery pack, the bottom protective plate includes: The bottom protective plate body has a cavity formed inside it. The bottom protective plate body includes a first plate and a second plate that are stacked on each other along a first direction, and the first plate and the second plate are spaced apart along the first direction to form the cavity. The support ribs are provided in multiple ways. The multiple support ribs are elastically supported in the cavity, and each support rib is fixedly connected to the first plate and the second plate at both ends along the first direction. The multiple support ribs are arranged at intervals along the second direction, and the first direction is perpendicular to the second direction.

2. The bottom protective plate according to claim 1, characterized in that, The multiple supporting ribs extend along a third direction and penetrate the cavity, with the first direction, the second direction, and the third direction being perpendicular to each other.

3. The bottom protective plate according to claim 2, characterized in that, The shape constructed by the projection of the supporting rib onto the third direction is at least one of a polygon or an arc.

4. The bottom protective plate according to claim 3, characterized in that, The thickness of the battery pack in the first direction is H, and the thickness of the bottom protective plate body in the first direction is h, satisfying: 0.07H≤h≤0.13H; the thickness of the first plate and the second plate body in the first direction is t, satisfying: 1.5mm≤t≤2mm.

5. The bottom protective plate according to claim 4, characterized in that, The supporting rib is a hollow cylinder. The radius of the outer wall of the hollow cylinder is R1, which satisfies: R1=(h-2*t) / 2. The radius of the inner wall of the hollow cylinder is r1. The wall thickness of the hollow cylinder is t1, which satisfies: t1=R1-r1, 1.5mm≤t1≤2mm. The distance between two adjacent hollow cylinders is a1, which satisfies: 4R1≤a1≤6R1.

6. The bottom protective plate according to claim 4, characterized in that, The supporting rib is constructed as an arc-shaped plate arranged around the straight line of the third direction, and the central angle of the arc-shaped plate is 180°.

7. The bottom protective plate according to claim 6, characterized in that, Both ends of the arc-shaped plate abut against the first plate or the second plate.

8. The bottom protective plate according to claim 7, characterized in that, The openings of the plurality of arc-shaped plates all face the first plate and / or the second plate.

9. The bottom protective plate according to claim 6, characterized in that, The radius of the outer side wall of the arc-shaped plate is R2, satisfying: R2=h-2*t; the radius of the inner side wall of the arc-shaped plate is r2; the wall thickness of the arc-shaped plate is t2, satisfying: t2=R2-r2, 1.5mm≤t2≤2.0mm; the distance between two adjacent arc-shaped plates is a2, satisfying: 4R2≤a2≤6R2.

10. A battery pack, characterized in that, include: The bottom protective plate according to any one of claims 1-9.

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