Battery pack bottom protection assembly and battery pack

Abstract

This utility model relates to the field of power battery technology, and provides a battery pack bottom protection assembly and a battery pack, including: a bottom protective plate; a support plate located above the bottom protective plate, including a plate body and multiple reinforcing parts, the reinforcing parts protruding from the side of the plate body facing the bottom protective plate and extending along a first direction, the multiple reinforcing parts being spaced apart along a second direction, and an exhaust channel forming between adjacent reinforcing parts; and a buffer member, wherein each reinforcing part and the bottom protective plate are pressed together, the buffer member and the reinforcing part engaging in a concave-convex fit in the thickness direction of the plate body. This battery pack bottom protection assembly, while meeting the same impact resistance performance, can reduce the thickness of the support plate and the bottom protective plate, thereby reducing the weight of the battery pack bottom protection assembly and lowering its cost.

Description

Technical Field

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

[0002] The safety design indicators of power batteries involve electrical safety, structural safety, and thermal safety. Structural safety includes the battery pack's resistance to impacts from pillars, bottom protection, and sealing. During electric vehicle operation, bottom-side conditions such as dragging or impacts directly affect the battery pack's bottom safety. In related technologies, to ensure the safety of the battery pack's bottom protection structure, a double-layer plate structure is typically used. However, this structure is relatively heavy, hindering lightweight battery pack design. Utility Model Content

[0003] This invention provides a bottom protection component for a battery pack and a battery pack, to solve the problem of the heavy weight of the bottom protection component for a battery pack in the prior art.

[0004] This utility model provides a bottom protection component for a battery pack, including:

[0005] Bottom guard plate;

[0006] A support plate, located above the bottom protective plate, includes a plate body and multiple reinforcing parts. The reinforcing parts protrude from the side of the plate body facing the bottom protective plate and extend along a first direction. The multiple reinforcing parts are spaced apart along a second direction, and an exhaust channel is formed between two adjacent reinforcing parts.

[0007] A buffer is provided between each of the reinforcing parts and the bottom protective plate, and the buffer and the reinforcing parts are in a concave-convex fit in the thickness direction of the plate.

[0008] According to the present invention, a bottom protection component for a battery pack includes a reinforcing part comprising a plurality of reinforcing ribs, the reinforcing ribs extending along a first direction and the plurality of reinforcing ribs spaced apart along a second direction.

[0009] According to the present invention, a bottom protection component for a battery pack includes a buffer part comprising a body part and a protrusion part. The body part is pressed between the reinforcing rib and the bottom protective plate, and the protrusion part protrudes from the side of the body part facing the reinforcing rib. The protrusion part is located between two adjacent reinforcing ribs and is pressed between the plate and the bottom protective plate.

[0010] According to the present invention, a bottom protection component for a battery pack is provided, wherein the plate body is provided with a plurality of through holes corresponding to the position of the exhaust channel, the plurality of through holes are arranged at intervals along the first direction, the width of the reinforcing part in the second direction is W1, the size of the through hole in the second direction is W2, the spacing between two adjacent reinforcing ribs in the second direction is Y, W1≥1.2W2, W2≥2Y.

[0011] According to the present invention, a bottom protection assembly for a battery pack includes a plate body comprising a plurality of first plate portions and a plurality of second plate portions, wherein the plurality of first plate portions and the plurality of second plate portions are connected alternately in a second direction, the reinforcing portion protrudes from the first plate portion, and the exhaust channel is defined between the second plate portion and the bottom protective plate, wherein the thickness of the first plate portion is less than the thickness of the second plate portion.

[0012] According to the present invention, the thickness of the second plate is T, 4mm≤T≤6mm; the height of the reinforcing part relative to the plate is H1; and the dimension of the bottom protection component of the battery pack in the thickness direction of the plate is H2, where H1=(1 / 3~1 / 2)H2.

[0013] According to the present invention, a battery pack bottom protection component is provided, and a plurality of buffer members are provided corresponding to the position of each of the reinforcing parts, and the plurality of buffer members are arranged at intervals along the first direction.

[0014] According to the present invention, a bottom protection assembly for a battery pack is provided, wherein the bottom protection plate includes a substrate and a polymer coating, and the polymer coating is applied to the side of the substrate away from the support plate;

[0015] And / or, the bottom protection assembly of the battery pack further includes mica paper, and the mica paper is disposed on the bottom protection plate in the area corresponding to the exhaust channel; one end of the mica paper in the second direction is pressed between the buffer member and the bottom protection plate, and the other end of the mica paper in the second direction is pressed between another buffer member and the bottom protection plate.

[0016] According to the present invention, the thickness of the polymer coating is a, and the thickness of the substrate is b; wherein, 0.5mm≤a≤2mm, and / or 0.7mm≤b≤1.5mm.

[0017] This utility model also provides a battery pack, including: a frame, a battery module, and any one of the above-mentioned battery pack bottom protection components, wherein the battery module is housed in the frame, and the battery pack bottom protection component is installed on the bottom of the frame.

[0018] The battery pack bottom protection assembly and battery pack provided by this utility model, by setting a buffer between a support plate and a bottom protection plate, wherein a plurality of reinforcing parts extending in a first direction are protruding on the side of the support plate facing the bottom protection plate, the plurality of reinforcing parts are arranged in a second direction, and an exhaust channel is formed between adjacent reinforcing parts, the buffer is pressed between the reinforcing parts and the bottom protection plate, and the buffer and the reinforcing parts are in concave-convex fit, thereby within a limited design space, not only is the structure of the support plate reinforced by the reinforcing parts, but the impact energy received by the bottom of the battery pack can also be effectively absorbed by the buffer. Therefore, while meeting the same impact resistance performance, the thickness of the support plate and the bottom protection plate can be reduced, thereby reducing the weight of the battery pack bottom protection assembly and reducing the cost of the battery pack bottom protection assembly. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is an exploded structural diagram of the battery pack provided by this utility model.

[0021] Figure 2 This is a schematic diagram of the frame structure of the battery pack provided by this utility model.

[0022] Figure 3 yes Figure 2 Partial sectional view at point AA.

[0023] Figure 4 yes Figure 2 Partial sectional view at point BB.

[0024] Figure label:

[0025] 100. Battery pack bottom protection assembly; 10. Vent channel; 11. Bottom protective plate; 111. Base plate; 112. Polymer coating; 12. Support plate; 120. Through hole; 121. Plate body; 1211. First plate section; 1212. Second plate section; 122. Reinforcing section; 1221. Reinforcing rib; 13. Buffer component; 131. Main body section; 132. Protrusion; 14. Mica paper; 200. Frame body; 21. Frame edge; 22. Bottom plate; 221. Clearance hole; 300. Battery module; 31. Battery cell. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] In the description of the embodiments of this utility model, it should be noted that, unless otherwise expressly specified and limited, the terms "first" and "second" are numbered for the purpose of clearly identifying product components and do not represent any substantial difference. The terms "installed," "connected," and "linked" 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 direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model according to the specific circumstances. Furthermore, "multiple" means two or more. In the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0028] The following is combined with Figures 1-4 This invention describes the bottom protection component of the battery pack and the battery pack.

[0029] like Figure 1 As shown, the battery pack bottom protection assembly 100 provided in this embodiment of the present invention includes a bottom protection plate 11, a support plate 12, and a buffer member 13. The support plate 12 is located above the bottom protection plate 11 and includes a plate body 121 and a plurality of reinforcing parts 122. The reinforcing parts 122 protrude from the side of the plate body 121 facing the bottom protection plate 11 and extend along a first direction. The plurality of reinforcing parts 122 are spaced apart along a second direction, and an exhaust channel 10 is formed between two adjacent reinforcing parts 122. A buffer member 13 is pressed between each reinforcing part 122 and the bottom protection plate 11, and the buffer member 13 and the reinforcing part 122 are in a concave-convex fit in the thickness direction of the plate body 121.

[0030] This embodiment of the invention also provides a battery pack, including a frame 200, a battery module 300, and a bottom protection component 100. The battery module 300 is housed within the frame 200. The bottom protection component 100 is mounted on the bottom of the frame 200. The bottom protection component 100 is used to withstand impacts to the bottom of the battery pack.

[0031] The battery module 300 includes multiple battery cells 31 arranged in multiple rows and / or columns. Optionally, see [link to relevant documentation]. Figure 2The first direction corresponds to the column direction of the battery cell 31 arrangement, and the second direction corresponds to the row direction of the battery cell 31 arrangement. The support plate 12 has multiple through holes 120 communicating with the exhaust channel 10. These through holes 120 are spaced apart along the first direction and are positioned opposite to the explosion-proof valves of the multiple battery cells 31, facilitating communication between the explosion-proof valves and the exhaust channel 10. When a battery cell 31 experiences thermal runaway, the internal gas pressure of the battery cell 31 reaches the pressure relief threshold of the explosion-proof valve. The gas can then be discharged from the battery pack through the exhaust channel 10 without flowing into the electrical compartment of the battery pack, achieving thermal-electric separation and ensuring the safety of the battery pack.

[0032] Optionally, the frame 200 has an open-bottom frame structure, and the battery pack bottom protection component 100 is installed at the bottom of the frame 200 with the support plate 12 facing upward, forming an accommodating cavity with the frame 200. The battery module 300 is supported on the support plate 12. Alternatively, the frame 200 includes a side frame 21 and a bottom plate 22. The side frame 21 surrounds the battery module 300 and, together with the bottom plate 22, forms an accommodating cavity. The battery module 300 is supported on the bottom plate 22, and the bottom plate 22 has a plurality of clearance holes 221 that correspond one-to-one with the plurality of through holes 120 on the support plate 12.

[0033] Optionally, the support plate 12 is welded to the frame 200, and the bottom protective plate 11 is connected and fixed to the bottom of the frame 200 via threaded connectors. The bottom protective plate 11 can be a steel plate to ensure its structural strength; alternatively, the bottom protective plate 11 includes a substrate 111 and a polymer coating 112, with the polymer coating 112 applied to the side of the substrate 111 away from the support plate 12. The substrate 111 can be a steel plate to ensure its structural strength, and the polymer coating 112 is used to improve the corrosion resistance, wear resistance, and impact resistance of the outer surface of the bottom protective plate 11. The support plate 12 can be an aluminum plate to reduce the weight of the component and lower its cost.

[0034] The buffer 13 is pressed between the reinforcing portion 122 of the support plate 12 and the bottom protective plate 11, flexibly connecting the reinforcing portion 122 and the bottom protective plate 11. Since the reinforcing portion 122 and the buffer 13 are supported between the plate body 121 of the support plate 12 and the bottom protective plate 11, a gap exists between the plate body 121 and the bottom protective plate 11. The gap between two adjacent reinforcing portions 122 forms an exhaust channel 10, which communicates with the outside of the battery pack. Because the reinforcing portion 122 extends along a first direction, an exhaust channel 10 extending along the first direction is formed.

[0035] The buffer 13 is a structural component with a certain degree of elasticity that can absorb impact. When the bottom protective plate 11 is impacted, the buffer 13 can undergo elastic deformation to buffer and absorb energy, thereby protecting the battery cell 31, reducing the risk of damage to the explosion-proof valve caused by the deformation of the support plate 12 under impact, and improving the safety performance of the battery pack.

[0036] In this design, the buffer 13 and the reinforcing part 122 are in a concave-convex fit. This can be understood as the buffer 13 having concave and convex portions relative to the reinforcing part 122, and the reinforcing part 122 also having concave and convex portions relative to the buffer 13. The convex portion of the reinforcing part 122 fits with the concave portion of the buffer 13, and the concave portion of the reinforcing part fits with the convex portion of the buffer 13, forming an interlocking structure between the reinforcing part 122 and the buffer part in the thickness direction of the plate 121. Thus, the structural strength of the support plate 12 is enhanced by the presence of the reinforcing part 122; the thickness of the local area between the buffers is also increased, ensuring the buffering effect of the buffer 13 and improving the impact resistance of the battery pack bottom protection assembly 100; the concave-convex fit between the reinforcing part 122 and the buffer 13 also serves to limit the movement of the buffer 13.

[0037] The buffer element 13 can be made of soft PP (polypropylene) or microporous PP (such as EPP45, EPP60, EPP90, 5x MPP or 140x MPP), where EPP is foamed polypropylene and MPP is microporous foamed polypropylene. The buffer element 13 can be constructed as MPP square microporous foam or MPP honeycomb foam to further improve the buffering and energy absorption effect of the buffer element 13.

[0038] The battery pack bottom protection assembly 100 provided in this embodiment of the utility model provides a buffer 13 between a support plate 12 and a bottom protection plate 11. The support plate 12 has a plurality of reinforcing parts 122 protruding on the side facing the bottom protection plate 11 and extending in a first direction. The plurality of reinforcing parts 122 are arranged in a second direction, and an exhaust channel 10 is formed between adjacent reinforcing parts 122. The buffer 13 is pressed between the reinforcing parts 122 and the bottom protection plate 11, and the buffer 13 and the reinforcing parts 122 are in concave-convex fit. Thus, within a limited design space, not only is the structure of the support plate 12 reinforced by the reinforcing parts 122, but the impact energy received by the bottom of the battery pack can also be effectively absorbed by the buffer 13. Therefore, while meeting the same impact resistance performance, the thickness of the support plate 12 and the bottom protection plate 11 can be reduced, thereby reducing the weight of the battery pack bottom protection assembly 100 and reducing the cost of the battery pack bottom protection assembly 100.

[0039] like Figure 3 As shown, in some embodiments of this utility model, the reinforcing part 122 includes a plurality of reinforcing ribs 1221, which extend along a first direction and are spaced apart along a second direction. Specifically, the reinforcing ribs 1221 extend from one end of the support plate 12 to the other end, and the exhaust channel 10 is located between two adjacent reinforcing ribs 1221 of two adjacent reinforcing parts 122. The buffer member 13 is pressed between the reinforcing ribs 1221 and the bottom guard plate 11 to achieve flexible contact between the reinforcing ribs 1221 and the bottom guard plate 11.

[0040] It should be noted that the structure of the reinforcing part 122 in this embodiment is not limited to the structure of the multiple reinforcing ribs 1221 extending along the first direction described in the above embodiment. In practical applications, other structural forms of the reinforcing part 122 can be provided as needed. For example, the reinforcing part 122 can also be a grid-like protrusion.

[0041] like Figure 3 As shown, in some embodiments of this utility model, the buffer member 13 includes a body portion 131 and a protrusion portion 132. The body portion 131 is pressed between the reinforcing rib 1221 and the bottom protective plate 11, and the protrusion portion 132 protrudes from the side of the body portion 131 facing the reinforcing rib 1221. The protrusion portion 132 is located between two adjacent reinforcing ribs 1221 and is pressed tightly between the plate 121 and the bottom protective plate 11.

[0042] The protrusion 132 forms the convex portion of the buffer 13, while the area of ​​the body portion 131 without the protrusion 132 forms the concave portion of the buffer 13. The reinforcing rib 1221 forms the convex portion of the reinforcing portion 122, and the position between two reinforcing ribs 1221 forms the convex portion of the reinforcing portion 122. The body portion 131 and the protrusion 132 are integrally formed.

[0043] Specifically, the side of the main body 131 away from the support plate 12 is flat, designed to fit against the bottom protective plate 11. The main body 131 is pressed between the reinforcing rib 1221 and the bottom protective plate 11, allowing for flexible contact between the reinforcing rib 1221 and the bottom protective plate 11. A protrusion 132 protrudes from the side of the main body 131 facing the support plate 12. Each protrusion 132 is located between two adjacent reinforcing ribs 1221 and is pressed between the plate 121 and the bottom protective plate 11, allowing for flexible contact between the plate 121 and the bottom protective plate 11. In this way, the impact energy received by the bottom protective plate 11 can be effectively absorbed by the buffer 13, reducing the risk of deformation of the support plate 12 or minimizing the intrusion of deformation of the support plate 12 into the explosion-proof valve.

[0044] like Figure 4 As shown, in some embodiments of this utility model, the plate 121 is provided with a plurality of through holes 120 corresponding to the position of the exhaust channel 10, and the plurality of through holes 120 are arranged at intervals along the first direction. The width of the reinforcing part 122 in the second direction is W1, the size of the through hole 120 in the second direction is W2, and the distance between two adjacent reinforcing ribs 1221 in the second direction is Y, where W1≥1.2W2 and W1≥2Y.

[0045] The size W2 of the through hole 120 corresponds to the explosion-proof valve of the battery cell 31. The larger the size of the explosion-proof valve in the second direction, the larger the size W2 of the through hole 120. Consequently, the size of the reinforcing part 122 in the second direction is also larger. The size W1 of the reinforcing part 122 in the second direction is the distance between the two outermost reinforcing ribs 1221 in the second direction that are facing away from each other.

[0046] The ratio of the dimension W1 of the reinforcing part 122 in the second direction to the dimension W2 of the through hole 120 in the second direction is at least 1.2, which helps to ensure the overall structural strength of the support plate 12 and the contact range between the support plate 12 and the buffer 13. Furthermore, the ratio of the dimension W1 of the reinforcing part 122 in the second direction to the distance Y between two adjacent reinforcing ribs 1221 in the second direction is at least 2, which effectively limits the minimum number of reinforcing ribs 1221 included in the reinforcing part 122, thus ensuring the structural strength of the first plate part 1211 and the buffering performance of the buffer 13. The dimension Y can be 3 to 5 times the width of the reinforcing rib 1221 in the second direction. Through the dimensional settings in this embodiment, the bottom protection assembly 100 of the battery pack exhibits good impact resistance in the bottom ball impact test.

[0047] See Figure 3 In some embodiments of this utility model, the plate body 121 includes a plurality of first plate portions 1211 and a plurality of second plate portions 1212. The plurality of first plate portions 1211 and the plurality of second plate portions 1212 are connected in an alternating manner in a second direction. A reinforcing portion 122 protrudes from the first plate portion 1211, and an exhaust channel 10 is defined between the second plate portion 1212 and the bottom protective plate 11. The thickness of the first plate portion 1211 is less than the thickness of the second plate portion 1212.

[0048] It is understood that the first plate portion 1211 and the second plate portion 1212 extend along the first direction, and the plurality of first plate portions 1211 and the plurality of second plate portions 1212 are connected in an alternating manner in the second direction. The buffer member 13 is located between the first plate portion 1211 and the bottom guard plate 11, and an exhaust channel 10 is formed between the second plate portion 1212 and the bottom guard plate 11.

[0049] Since the strength of the first plate portion 1211 is enhanced by the reinforcing portion 122, the thickness of the first plate portion 1211 can be appropriately reduced to increase the distance between the first plate portion 1211 and the body of the buffer member 13, thereby increasing the space available for accommodating the protrusion 132 of the buffer member 13. In this way, a relatively high protrusion 132 can be provided, which is beneficial to improving the buffering performance of the buffer member 13 and enhancing the impact resistance of the battery pack bottom protection assembly 100.

[0050] See Figure 4In some embodiments of this utility model, the thickness of the second plate 1212 is T, where 4mm ≤ T ≤ 6mm. The height of the reinforcing part 122 relative to the plate 121 is H1, and the dimension of the bottom protective component 100 of the battery pack in the thickness direction of the plate 121 is H2, where H1 = (1 / 3~1 / 2)H2.

[0051] It is understandable that the height H1 of the reinforcing part 122 relative to the plate 121 is the height at which the reinforcing rib 1221 protrudes from the plate 121. The dimension H2 of the bottom protection component 100 of the battery pack in the thickness direction of the plate 121 is the distance between the side of the support plate 12 and the bottom protective plate 11 that are far apart from each other, which is the design space of the bottom protection component 100 of the battery pack in the height direction.

[0052] The bottom mounting space reserved for the battery pack in an electric vehicle determines the size of the design space. In this embodiment, by setting H1=(1 / 3~1 / 2)H2, it is beneficial to better allocate the dimensions of the support plate 12, the reinforcing part 122, the buffer 13 and the bottom guard plate 11 in the height direction within the limited design space, so as to obtain a battery pack bottom protection assembly 100 with high impact resistance.

[0053] In this embodiment of the invention, a plurality of buffer members 13 are provided corresponding to the position of each reinforcing part 122, and the plurality of buffer members 13 are arranged at intervals along the first direction. That is, a connecting channel is formed between two adjacent buffer spaces in the first direction, and the connecting channel can connect the two exhaust channels 10 located on both sides of the reinforcing part 122, which is beneficial to improving the exhaust efficiency of the battery pack.

[0054] In this embodiment of the invention, when the bottom protective plate 11 includes a substrate 111 and a polymer coating 112, the thickness of the polymer coating 112 is 'a', and the thickness of the substrate 111 is 'b'. Wherein, 0.5mm ≤ a ≤ 2mm, and / or, 0.7mm ≤ b ≤ 1.5mm. Optionally, 'a' can be 1mm or 1.5mm, and 'b' can be 1mm or 1.2mm.

[0055] In ball impact tests conducted on a large number of battery packs equipped with the battery pack bottom protection component 100 provided in this embodiment of the invention, the dimension H2 of the battery pack bottom protection component 100 in the thickness direction of the plate 121 was 11 mm, and the following parameters were set: W1≥1.2W2, W1≥2Y, H1=(1 / 3~1 / 2)H2, 4mm≤T≤6mm, 0.5mm≤a≤2mm, and 0.7mm≤b≤1.5mm. A ball (made of #45 steel) with a mass of 10 kg and a diameter of 25 mm was used to impact the bottom of the battery pack at a speed of 14 m / s (equivalent to 1000 J of energy). The results showed that the intrusion of the component into the explosion-proof valve of the cell 31 was 0. This indicates that this structural design effectively protects the cell 31 under an impact energy of 1000 J, effectively improving the safety performance of the bottom of the battery pack.

[0056] The battery pack bottom protection assembly 100 provided in this embodiment of the present invention also includes mica paper 14. Mica paper 14 is disposed on the bottom protective plate 11 in the area corresponding to the exhaust channel 10. One end of the mica paper 14 in the second direction is pressed between the buffer member 13 and the bottom protective plate 11, and the other end of the mica paper 14 in the second direction is pressed between another buffer member 13 and the bottom protective plate 11. The mica paper 14 has excellent high-temperature resistance, electrical insulation, and mechanical properties, and can serve as a protective heat insulation layer to protect the bottom protective plate 11, thereby improving the safety of the battery pack.

[0057] Specifically, the mica paper 14 extends along the first direction and covers the entire channel area of ​​the exhaust channel 10. The mica paper 14 can be glued and fixed to the bottom guard plate 11. The two ends of the mica paper 14 in the second direction are respectively pressed between the buffer member 13 and the bottom guard plate 11 to prevent displacement and ensure its effective coverage area.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A bottom protection assembly for a battery pack, characterized in that, include: Bottom guard plate; A support plate, located above the bottom protective plate, includes a plate body and multiple reinforcing parts. The reinforcing parts protrude from the side of the plate body facing the bottom protective plate and extend along a first direction. The multiple reinforcing parts are spaced apart along a second direction, and an exhaust channel is formed between two adjacent reinforcing parts. A buffer is provided between each of the reinforcing parts and the bottom protective plate, and the buffer and the reinforcing parts are in a concave-convex fit in the thickness direction of the plate.

2. The battery pack bottom protection assembly according to claim 1, characterized in that, The reinforcing part includes a plurality of reinforcing ribs, which extend along the first direction and are spaced apart along the second direction.

3. The battery pack bottom protection assembly according to claim 2, characterized in that, The buffer includes a body and a protrusion. The body is pressed between the reinforcing rib and the bottom protective plate, and the protrusion protrudes from the side of the body facing the reinforcing rib. The protrusion is located between two adjacent reinforcing ribs and is pressed between the plate and the bottom protective plate.

4. The battery pack bottom protection assembly according to claim 3, characterized in that, The plate body has multiple through holes corresponding to the position of the exhaust channel. The multiple through holes are arranged at intervals along the first direction. The width of the reinforcing part in the second direction is W1, the size of the through hole in the second direction is W2, and the distance between two adjacent reinforcing ribs in the second direction is Y. W1≥1.2W2, W1≥2Y.

5. The battery pack bottom protection assembly according to any one of claims 1 to 4, characterized in that, The plate body includes a plurality of first plate portions and a plurality of second plate portions, which are connected in an alternating manner in a second direction. The reinforcing portion protrudes from the first plate portion, and the exhaust channel is defined between the second plate portion and the bottom protective plate. The thickness of the first plate portion is less than the thickness of the second plate portion.

6. The battery pack bottom protection assembly according to claim 5, characterized in that, The thickness of the second plate is T, 4mm≤T≤6mm; the height of the reinforcing part relative to the plate is H1; the dimension of the bottom protective assembly of the battery pack in the thickness direction of the plate is H2, H1=(1 / 3~1 / 2)H2.

7. The battery pack bottom protection assembly according to claim 1, characterized in that, A plurality of buffer members are provided corresponding to the position of each of the reinforcing parts, and the plurality of buffer members are arranged at intervals along the first direction.

8. The battery pack bottom protection assembly according to any one of claims 1 to 4, characterized in that, The bottom protective plate includes a substrate and a polymer coating, wherein the polymer coating is applied to the side of the substrate away from the support plate; And / or, the bottom protection assembly of the battery pack further includes: mica paper, wherein the mica paper is disposed on the bottom protective plate in the area corresponding to the exhaust channel; one end of the mica paper in the second direction is pressed between the buffer member and the bottom protective plate, and the other end of the mica paper in the second direction is pressed between another buffer member and the bottom protective plate.

9. The battery pack bottom protection assembly according to claim 8, characterized in that, The thickness of the polymer coating is a, and the thickness of the substrate is b; wherein, 0.5mm≤a≤2mm, and / or 0.7mm≤b≤1.5mm.

10. A battery pack, characterized in that, include: The battery module is housed within the frame, and the battery pack bottom protection assembly is mounted on the bottom of the frame, according to any one of claims 1 to 9.

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