Protective floor and battery pack

Abstract

The utility model discloses a protection bottom plate, protection bottom plate is integrated moulding, including the first layer board, second layer board, third layer board along vertical direction distribution, be connected through a plurality of vertical ribs between first layer board and second layer board, and second layer board and third layer board are connected through a plurality of vertical ribs, third layer board includes a plurality of arc plate, and a plurality of arc plate is wave -like structure, and arc plate is protruding to the direction of away from second layer board. The utility model discloses still including battery package. The utility model has the advantages that: protection bottom plate can realize energy absorption while enhancing rigidity, and can realize multiple sealing structure with the box, improve sealing effect.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more particularly to a protective base plate. Background Technology

[0002] As competition in the electric vehicle market intensifies, bottom protection of battery packs is receiving increasing attention from customers and OEMs. Currently, most battery pack bottom plates on the market are single-layer plates, which have poor rigidity and are unlikely to provide adequate bottom protection. Furthermore, the stringent standards for ensuring airtightness and preventing failure under open bottom protection conditions make it difficult for single-layer sealed battery pack enclosures to meet the requirements.

[0003] Currently, some are protective base plates, but double-layer plates are mostly flat structures, and their base plate rigidity and bottom protection space are still limited, as are the protection directions.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] The technical problem to be solved by this utility model is: how to solve the problem that the current base plate has limited rigidity and cannot meet the requirements of multi-angle protection.

[0006] This utility model solves the above-mentioned technical problems through the following technical means:

[0007] The protective base plate is integrally formed and includes a first layer plate, a second layer plate, and a third layer plate distributed in a vertical direction. The first layer plate and the second layer plate are connected by multiple vertical ribs, and the second layer plate and the third layer plate are connected by multiple vertical ribs. The third layer plate includes multiple arc-shaped plates with a wavy structure, and the arc-shaped plates bulge away from the second layer plate.

[0008] The protective base plate of this utility model is an integrally formed aluminum profile with a compact structure and no complicated processing steps, which can achieve mass production. After the utility model is used, the overall rigidity is significantly increased compared with the single-layer base plate. At the same time, the protective and energy absorption space of the protective base plate is increased. The arc-shaped plate can protect against bottom ball impacts from various angles due to the arc shape of its lower surface. Meanwhile, the vertical ribs further improve the rigidity of the protective base plate.

[0009] Preferably, adjacent arc-shaped plates are connected to the same vertical rib, and the ends of the arc-shaped plates on both sides of the third layer plate are directly connected to the second layer plate, forming a buffer cavity between the arc-shaped plates and the second layer plate.

[0010] The buffer chamber can absorb impacts from all directions, reducing damage to the battery pack.

[0011] Preferably, both the first and second layers are square or rectangular.

[0012] Preferably, a plurality of connection holes are included along the edge of the second layer plate.

[0013] The connection holes are used to connect the protective base plate to the enclosure.

[0014] Preferably, the widths of the multiple vertical ribs are the same or different.

[0015] Preferably, multiple vertical ribs are arranged in parallel or intersecting directions.

[0016] Preferably, the vertical ribs are vertically or obliquely connected to the first layer plate and the second layer plate.

[0017] The vertical ribs further improve the rigidity of the protective base plate and can make the bottom stress more even.

[0018] Preferably, the vertical ribs between the first and second layers are aligned vertically or staggered with the vertical ribs between the second and third layers.

[0019] Preferably, the second layer is larger than the first layer, and the projection of the first layer onto the second layer is located in the middle of the second layer.

[0020] This utility model also discloses a battery pack, including the aforementioned protective base plate and housing. The second layer of the protective base plate is larger than the first layer plate, and the second layer plate and the first layer plate form a stepped structure. The bottom inner side of the housing includes a stepped structure. The stepped structure of the protective base plate fits into the stepped structure of the housing, and a sealing material is connected to the fitting surface.

[0021] The stepped structure of the protective base plate matches the stepped structure of the enclosure, and through arbitrary connections and combinations such as FDS, screws, rivets, welding, sealant, and sealing foam, a multi-layer sealing effect is formed at the bottom of the battery pack.

[0022] The advantages of this utility model are:

[0023] The protective base plate of this utility model is an integrally formed aluminum profile with a compact structure and no complicated processing steps, which can achieve mass production. After the utility model is used, the overall rigidity is significantly increased compared with the single-layer base plate. At the same time, the protective and energy absorption space of the protective base plate is increased. The arc-shaped plate can protect against bottom ball impacts from various angles due to the arc shape of its lower surface. Meanwhile, the vertical ribs further improve the rigidity of the protective base plate.

[0024] The stepped structure of the protective base plate matches the stepped structure of the enclosure, and through arbitrary connections and combinations such as FDS, screws, rivets, welding, sealant, and sealing foam, a multi-layer sealing effect is formed at the bottom of the battery pack. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the protective base plate according to an embodiment of this utility model;

[0026] Figure 2 This is a schematic diagram of the structure of the protective base plate according to an embodiment of this utility model;

[0027] Figure 3 This is a schematic diagram of the connection between the protective base plate and the box body in an embodiment of this utility model;

[0028] Figure 4 This is a partial structural schematic diagram of the box body according to an embodiment of the present utility model;

[0029] Figure 5 This is a side view of the housing according to an embodiment of the present utility model;

[0030] Figure 6 This is a schematic diagram of the installation of the liquid cooling plate in an embodiment of this utility model;

[0031] Figure 7 These are simulation diagrams of the first-order bending mode and the first-order torsional mode of this utility model embodiment;

[0032] Figure 8 This is a simulation diagram of the bottom impact of an embodiment of this utility model;

[0033] Numbering on the map:

[0034] 1. Housing; 11. First sealing surface; 12. Second sealing surface; 13. Third sealing surface; 14. Lifting lug;

[0035] 2. Protective base plate; 21. First layer plate; 22. Second layer plate; 23. Third layer plate; 24. Vertical reinforcement;

[0036] 3. Sealing components; 4. Liquid cooling plate. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. 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.

[0038] Example 1:

[0039] like Figure 1 As shown, the protective base plate 2 includes a first layer plate 21, a second layer plate 22, and a third layer plate 23 distributed vertically. The first layer plate 21 and the second layer plate 22 are connected by multiple vertical ribs 24, and the second layer plate 22 and the third layer plate 23 are also connected by multiple vertical ribs 24. The third layer plate 23 includes multiple arc-shaped plates 231, which have a wave-like structure. Adjacent arc-shaped plates 231 are connected to the same vertical rib 24. The ends of the arc-shaped plates 231 on both sides of the third layer plate 23 are directly connected to the second layer plate 22, and a buffer cavity 25 is formed between the arc-shaped plates 231 and the second layer plate 22.

[0040] In this embodiment, the first layer plate 21 is a flat plate, and the first layer plate 21 is a square or rectangular plate.

[0041] The second layer plate 22 is also a flat plate, and it can be square or rectangular. A ring of connecting holes is included at the edge of the second layer plate 22 for screwing into the housing 1. In this embodiment, screwing refers to connecting two components using bolts, screws, studs, etc.

[0042] like Figure 2 As shown, the third layer plate 23 includes multiple arc-shaped plates 231. The two ends of the arc-shaped plate 231 located in the middle are connected to two vertical ribs 24 respectively. One end of the arc-shaped plates 231 located on both sides is connected to the vertical ribs 24, and the other end extends towards the second layer plate 22 until it is connected to the second layer plate 22. In this embodiment, the arc-shaped plates 231, the second layer plate 22, and the vertical ribs 24 form a buffer cavity 25. The arc-shaped plates 231 protrude away from the second layer plate 22. Due to the arc shape of their surface, the arc-shaped plates 231 can protect against bottom ball impacts from various angles.

[0043] Due to the different weight distribution of the batteries inside the housing 1, the radius of curvature of the arc plate 231 and the length of the arc plate 231 can be set as needed.

[0044] In this embodiment, the buffer cavity formed between the arc-shaped plate 231 and the second layer plate 22 improves the rigidity of the entire protective base plate 2, while also increasing the protection and energy absorption space of the protective base plate 2. In particular, the third layer plate 23 can be arbitrarily chosen to be horizontally or vertically oriented when the protective base plate 2 is installed with the housing 1, depending on the rigidity requirements of the battery pack in different directions.

[0045] In this embodiment, there are multiple vertical ribs 24. Each vertical rib 24 can be a single long strip structure. The length of the vertical rib 24 is set according to the length of the first layer plate 21. Preferably, the length of the vertical rib 24 is equal to or differs from the length of the first layer plate 21 or the third layer plate 23 by no more than 10 mm. Each vertical rib 24 can also be composed of multiple short plates, which are distributed at intervals along a straight line to form the vertical rib 24. Whether it is a single long strip structure or a vertical rib 24 composed of multiple short plates, the multiple vertical ribs 24 are preferably evenly distributed along the width direction.

[0046] The vertical rib 24 can form a vertical or inclined connection with the first layer plate 21 or the second layer plate.

[0047] The vertical ribs 24 between the first layer slab 21 and the second layer slab 22, and the vertical ribs 24 between the second layer slab 22 and the third layer slab 23 can be arranged in a vertically corresponding relationship or in a staggered arrangement.

[0048] like Figure 2 As shown, the thickness of the multiple vertical ribs 24 can be equal, unequal, or of equal thickness. Different widths of vertical ribs 24 can also be selected and used in combination according to the actual rigidity requirements of the base plate. In this embodiment, the vertical ribs 24 further improve the rigidity of the protective base plate 2.

[0049] In this embodiment, the first layer plate 21, the second layer plate 22, and the third layer plate 23 can be integrally formed aluminum profiles.

[0050] In this embodiment, the protective base plate 2 is a one-piece molded aluminum profile with a compact structure and no complex processing steps, enabling mass production. After use, the overall rigidity of this embodiment is significantly increased compared to a single-layer base plate. It also increases the protective and energy-absorbing space of the protective base plate 2, and the curved plate's lower surface arc shape can protect against bottom ball impacts from various angles. The vertical ribs 24 further enhance the rigidity of the protective base plate.

[0051] like Figure 7 The figure shows a simulation comparison of the first-order bending mode and the first-order torsional mode of a single-layer base plate, a double-layer base plate, and the protective base plate in this embodiment.

[0052] Modal analysis is an important method in structural dynamics used to study the inherent vibration characteristics of a structure. Its core purpose is to determine the structure's natural frequencies, mode shapes, and damping ratios, which are collectively referred to as the structure's modal parameters.

[0053] The natural frequency is an inherent property of the structure and is unrelated to external excitation. The natural frequency is only affected by stiffness and mass, and an increase in stiffness necessarily leads to an increase in the natural frequency. Therefore, the magnitude of the bending and torsional stiffness of different structures can be determined by calculating the first-order bending and torsional modes.

[0054] from Figure 7 It can be seen that the first-order bending mode and the first-order torsional mode of the corrugated plate are both greater than those of the double-layer plate and the single-layer plate. Therefore, it can be concluded that the bending stiffness and torsional stiffness of the corrugated plate are stronger than those of the double-layer plate and the single-layer plate. That is, the corrugated plate in this embodiment has better resistance to bending deformation and torsional deformation than the double-layer plate and single-layer plate commonly used in the market.

[0055] Figure 8 As shown, the "GB38031-2025 Safety Requirements for Power Batteries for Electric Vehicles," formulated by the Ministry of Industry and Information Technology and approved and issued by the State Administration for Market Regulation and the Standardization Administration of China, has added a 150J bottom impact test. The test uses a 30mm diameter hemisphere, weighing 10kg, made of 45# steel, to impact the bottom of the battery pack with 150J of energy in the +Z direction. The requirements are: no leakage, casing rupture, fire, or explosion, and compliance with insulation resistance requirements.

[0056] Based on the above requirements, a 150J bottom impact simulation was conducted on the corrugated plate of this embodiment and commonly used double-layer flat plates and single-layer flat plates on the market, and the simulation results were compared. The simulation results show that the deformation of the corrugated plate is much smaller than that of the double-layer flat plates and single-layer flat plates. This indicates that when subjected to a 150J bottom impact (or even a higher energy standard), the corrugated plate can effectively protect the cells above the bottom guard plate, greatly reducing the amount of cell intrusion inside the battery pack.

[0057] Example 2:

[0058] like Figure 1 , Figure 2 , Figure 3 As shown, in this embodiment, the size of the second layer plate 22 is larger than that of the first layer plate 21, and the projection of the first layer plate 21 on the second layer plate 22 is located in the middle of the second layer plate 22. Where the projection is not located, a connection hole is opened on the second layer plate 22 for bolt connection with the housing 1.

[0059] Due to the dimensional difference between the first layer plate 21 and the second layer plate 22, the first layer plate 21 and the second layer plate 22 form a stepped structure, which matches the stepped structure on the bottom side of the box 1.

[0060] Specifically, such as Figure 3 , Figure 4 , Figure 5 As shown, the right top surface of the first layer plate 21 is sealed to the second sealing surface 12 of the left bottom surface of the housing 1 by a sealing element 3, and the right top surface of the second layer plate 22 is sealed to the third sealing surface 13 of the bottom surface of the housing 1 by a sealing element 3. In addition, sealing foam or other sealing materials can also be filled between the top surface of the first layer plate 21 and the first sealing surface 11 of the bottom surface of the housing 1. Thus, three seals are achieved.

[0061] It should be noted that, Figure 3 The diagram only shows one side of the box 1 with the protective base plate 2. In the actual product, the box 1 is a frame structure, and the circumference of the protective base plate 2 and the bottom of the box 1 form a ring like... Figure 3 The connection method shown.

[0062] Lifting lugs 14 can be installed on one side of the outer side of the housing 1. The lifting lugs 14 and the entire housing 1 can be integrally formed, resulting in a simple, compact structure that is easy to process.

[0063] In this embodiment, the first sealing surface 11, the second sealing surface 12, and the third sealing surface 13 are connected by a sealing element 3 (the sealing element 3 can be any combination of FDS, screw connection, riveting, welding, sealant, sealing foam, etc.) to achieve a three-layer sealing effect at the bottom of the battery pack; the height difference between the first sealing surface 11, the second sealing surface 12, and the third sealing surface 13 of the housing 1 provides a good bottom protection space.

[0064] Example 3:

[0065] like Figure 6 As shown, the gap between the first sealing surface 11 and the top surface of the protective base plate 2 can be used to insert the liquid cooling plate 4. The liquid cooling plate 4 can be connected to the housing 1 by bolts or other means, and a sealing element 3 is filled between the liquid cooling plate 4 and the first sealing surface 11 or / and the protective base plate 2.

[0066] This embodiment is applicable to situations where a liquid cooling plate 4 needs to be installed when the cell temperature requirement is high. The liquid cooling plate 4 is used to regulate the internal temperature of the cell.

[0067] In both Embodiment 2 and Embodiment 3, the housing 1 can be of the same specification. In Embodiment 2, the first sealing surface 11 is filled with sealing foam, while in Embodiment 3, it is used to fix the liquid cooling plate 3, thereby improving the application adaptability of the housing 1.

[0068] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended 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 guard bed, characterized in that The protective base plate is integrally formed and includes a first plate, a second plate, and a third plate distributed in the vertical direction. The first plate and the second plate are connected by multiple vertical ribs, and the second plate and the third plate are connected by multiple vertical ribs. The third plate includes multiple arc-shaped plates with a wave-like structure, and the arc-shaped plates bulge away from the second plate.

2. The protective base plate according to claim 1, characterized in that, Adjacent curved plates are connected to the same vertical rib, and the ends of the curved plates on both sides of the third layer plate are directly connected to the second layer plate, forming a buffer cavity between the curved plates and the second layer plate.

3. The protective base plate according to claim 1, characterized in that, Both the first and second layers are square or rectangular.

4. The protective base plate according to claim 1, characterized in that, A ring of multiple connection holes is included along the edge of the second layer plate.

5. The protective base plate according to claim 1, characterized in that, Multiple vertical ribs may have the same or different widths.

6. The protective base plate according to claim 1, characterized in that, Multiple vertical ribs are arranged in parallel or intersecting directions.

7. The protective base plate according to claim 1, characterized in that, The vertical reinforcement bars form a vertical or inclined connection with the first layer of slab, and with the second layer of slab.

8. The protective base plate according to claim 1, characterized in that, The vertical ribs between the first and second slabs are aligned vertically or staggered with the vertical ribs between the second and third slabs.

9. The protective base plate according to claim 1, characterized in that, The second layer is larger than the first layer, and the projection of the first layer onto the second layer is located in the middle of the second layer.

10. A battery pack, characterized in that, The protective base plate and the housing are included in any one of claims 1-9. The second layer of the protective base plate is larger than the first layer, and the second layer and the first layer form a stepped structure. The bottom inner side of the housing includes a stepped structure. The stepped structure of the protective base plate fits into the stepped structure of the housing, and a sealing material is connected to the fitting surface.

Images