Bottom shell assembly, battery pack and vehicle

Abstract

The utility model relates to the field of batteries, and discloses a bottom shell assembly, a battery pack and a vehicle. The bottom shell assembly comprises a shell, the shell comprises a supporting plate and a surrounding plate, the surrounding plate extends along the edge of the supporting plate and is connected with the supporting plate to form a containing cavity, and convex ribs are arranged on the surface, facing the containing cavity, of the supporting plate; the composite layer structure is arranged in the containing cavity, the composite layer structure is connected with the supporting plate, avoiding grooves are formed in the positions, opposite to the convex ribs, of the composite layer structure, and the avoiding grooves are used for avoiding the convex ribs. The composite layer structure can improve the strength and impact resistance of the supporting plate. And the composite layer structure can absorb and buffer the load transmitted to the battery by the supporting plate, so that the impact on the battery is reduced. According to the technical scheme, the avoiding grooves are formed in the composite layer structure to avoid the convex ribs, interference between the composite layer structure and the convex ribs can be avoided, the composite layer structure can make better contact with the positions, not provided with the convex ribs, of the supporting plate, and therefore the impact resistance of the positions, not provided with the convex ribs, of the supporting plate is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to bottom shell subassembly, battery pack and vehicle. BACKGROUND

[0002] In the field of new energy vehicles such as electric vehicles and hybrid electric vehicles, the battery pack is a crucial component, which not only needs to have sufficient energy density and power output, but also needs to ensure safety and reliability under various working conditions. The structural design of the battery pack directly affects its performance and safety, especially the design of the bottom shell is crucial for protecting the battery from external impact.

[0003] In the related art, the battery pack bottom shell is provided with a stamping structure. Although the stamping structure has advantages in production efficiency and cost control, its structural strength is relatively weak. In particular, the bottom wall of the bottom shell often cannot withstand a large external impact, which may cause damage to the internal components of the battery pack, and even cause safety accidents.

[0004] In order to improve the protection effect of the battery pack, it is usually necessary to add a rib on the bottom wall of the bottom shell. Although the addition of the rib can increase the rigidity of the bottom shell to a certain extent, the impact resistance of the position on the bottom shell where no rib is provided is still poor. SUMMARY

[0005] Therefore, the utility model provides a bottom shell assembly, a battery pack and a vehicle to solve or improve the problem of poor impact resistance of the bottom shell.

[0006] In a first aspect, the utility model provides a bottom shell assembly, comprising:

[0007] A shell body comprising a support plate and a surrounding plate, the surrounding plate extending along the edge of the support plate and being connected with the support plate to form a containing cavity, and the surface of the support plate facing the containing cavity being provided with a rib;

[0008] A composite layer structure provided in the containing cavity and connected with the support plate, the composite layer structure being provided with a relief groove at a position opposite to the rib, and the relief groove being used for avoiding the rib.

[0009] Beneficial effects: By providing a relief groove on the composite layer structure, the rib is avoided, which can avoid interference between the composite layer structure and the rib, so that the composite layer structure can better contact the position of the support plate where no rib is provided, thereby improving the impact resistance of the position of the support plate where no rib is provided.

[0010] In an optional embodiment, the composite layer structure comprises a buffer layer and a tensile layer connected with each other.

[0011] The buffer layer and the tensile-resistant layer are arranged on the support plate in a direction of approaching or moving away from the support plate, and at least one of the buffer layer and the tensile-resistant layer close to the support plate is provided with the avoiding slot.

[0012] In an alternative embodiment, the number of at least one of the buffer layer and the tensile-resistant layer is at least two, and the buffer layer and the tensile-resistant layer are arranged alternately in the direction of approaching or moving away from the support plate.

[0013] In an alternative embodiment, the buffer layer is arranged as a polypropylene honeycomb core, an aluminum alloy honeycomb core, a foam layer, a rubber layer or a foamed material layer.

[0014] And / or, the tensile-resistant layer is arranged as a steel plate or a glass fiber plate.

[0015] And / or, the shell is arranged as a steel shell, an aluminum shell or a glass fiber shell.

[0016] And / or, the shell is arranged as a stamping integrated structure.

[0017] In an alternative embodiment, the number of the convex ribs is at least two, the at least two convex ribs are arranged in sequence and at intervals, and the arrangement direction of the convex ribs intersects with the extension direction of the convex ribs.

[0018] In an alternative embodiment, the edge of the surrounding plate away from the support plate is provided with a flange, the flange is folded to the side of the surrounding plate away from the containing cavity, and the flange is provided with a through connecting hole.

[0019] In a second aspect, the utility model also provides a battery pack, comprising:

[0020] The bottom shell assembly as described above;

[0021] The cover plate is connected to the end of the surrounding plate away from the support plate and closes the containing cavity.

[0022] The battery is arranged in the containing cavity and connected to the surface of the composite layer structure away from the support plate.

[0023] In an alternative embodiment, the battery pack further comprises a cooling plate, the cooling plate is arranged in the containing cavity, one end of the cooling plate is connected to the convex rib, the other end of the cooling plate is connected to the cover plate, and the side wall of the cooling plate abuts against the battery.

[0024] In an alternative embodiment, at least one of the cooling plate, the cover plate and the convex rib is detachably connected.

[0025] In a third aspect, the utility model also provides a vehicle, including bottom shell subassembly as described above or battery pack as described above.

[0026] The battery pack and the vehicle provided by the utility model contain the bottom shell subassembly provided by the utility model, therefore contain all advantages of the bottom shell subassembly, and therefore will not be repeated. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in the prior art, the drawings needed in the specific embodiment or the prior art description will be briefly introduced as follows, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0028] Figure 1 The structural explosion view of the bottom shell subassembly provided by the embodiment of the utility model is shown in the figure.

[0029] Figure 2 The structural schematic diagram of the bottom shell subassembly provided by the embodiment of the utility model is shown in the figure.

[0030] Figure 3 The structural schematic diagram of another bottom shell subassembly provided by the embodiment of the utility model is shown in the figure.

[0031] Figure 4 The structural schematic diagram of another bottom shell subassembly provided by the embodiment of the utility model is shown in the figure.

[0032] Figure 5 The structural schematic diagram of another bottom shell subassembly provided by the embodiment of the utility model is shown in the figure.

[0033] Figure 6 The structural schematic diagram of the battery and the composite layer structure connection provided by the embodiment of the utility model is shown in the figure.

[0034] BRIEF DESCRIPTION OF DRAWINGS

[0035] 1, shell; 101, support plate; 102, coaming; 103, flanging; 104, containing cavity; 105, convex rib; 2, composite layer structure; 201, buffer layer; 202, tensile layer; 203, avoiding groove; 3, battery; 4, cooling plate; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0037] The bottom shell of the battery pack in the related art is provided as a stamping structure. The stamping structure has advantages in production efficiency and cost control, but its structural strength is relatively weak. In particular, the bottom wall of the bottom shell often cannot withstand a large external impact, which can cause damage to the internal elements of the battery pack when impacted, and even cause a safety accident.

[0038] Therefore, in order to improve the protection effect of the battery pack, it is usually necessary to add a rib on the bottom wall of the bottom shell. However, although the addition of the rib can increase the rigidity of the bottom shell to some extent, the impact resistance of the position on the bottom shell where no rib is provided is still poor.

[0039] In order to solve or improve the problem of poor impact resistance of the bottom shell, the embodiments of the utility model provide a bottom shell assembly, a battery pack and a vehicle.

[0040] The embodiments of the utility model will be described below in combination with Figures 1 to 6 The bottom shell assembly provided in the embodiments of the utility model.

[0041] Specifically, the bottom shell assembly comprises a shell 1 and a composite layer structure 2.

[0042] The shell 1 comprises a support plate 101 and a surrounding plate 102. The surrounding plate 102 extends along the edge of the support plate 101 and is connected with the support plate 101 to form a containing cavity 104, that is, the surrounding plate 102 forms a cylindrical structure with both ends open, and the support plate 101 is connected to one end of the cylindrical structure and enclosed with the cylindrical structure to form the containing cavity 104. The surface of the support plate 101 facing the containing cavity 104 is provided with a rib 105, that is, the rib 105 protrudes from the surface of the support plate 101 inside the containing cavity 104.

[0043] The composite layer structure 2 is arranged in the containing cavity 104, and the composite layer structure 2 is connected with the support plate 101, that is, the composite layer structure 2 is connected with the surface of the support plate 101 facing the containing cavity 104. The position opposite to the rib 105 of the composite layer structure 2 is provided with an avoiding groove 203, and the avoiding groove 203 is used for avoiding the rib 105, that is, the rib 105 is arranged in the avoiding groove 203.

[0044] In this embodiment, the support plate 101 of the housing 1 can be used to support and protect the battery 3, and the enclosure plate 102 of the housing 1 can be connected to the cover plate of the battery pack so that the housing 1 and the cover plate form a receiving chamber for accommodating the battery 3.

[0045] By providing ribs 105 on the support plate 101, the load applied to the support plate 101 can be effectively distributed, thereby reducing the deformation of the support plate 101, enabling the support plate 101 to better withstand pressure and impact, maintain its stability, and avoid excessive local stress leading to cracking or damage.

[0046] By making the rib 105 protrude from the surface of the support plate 101 facing the receiving cavity 104, the space inside the receiving cavity 104 can be fully utilized, the overall compactness of the battery pack can be improved, and the rib 105 protruding from the outer surface of the housing 1 can be prevented from interfering with other parts or items.

[0047] By providing a composite layer structure 2 on the surface of the support plate 101 facing the receiving cavity 104, the strength and impact resistance of the support plate 101 can be improved.

[0048] Specifically, the support plate 101 deforms when subjected to impact. For example, when the support plate 101 is impacted, it usually bends or bulges in the direction of the receiving cavity 104. The composite layer structure 2 can resist tensile stress and prevent the support plate 101 from undergoing excessive plastic deformation, thereby suppressing the bending or bulging of the support plate 101 and giving the support plate 101 better impact resistance.

[0049] At the same time, the composite layer structure 2 can also disperse the stress on the support plate 101, avoid local stress concentration on the support plate 101, and reduce the risk of local damage.

[0050] On the other hand, the composite layer structure 2 can play a buffering and energy absorption role. That is, when the support plate 101 is impacted, the composite layer structure 2 can absorb and buffer the load transmitted from the support plate 101 to the battery 3, thereby reducing the impact on the battery 3.

[0051] By placing the composite layer structure 2 inside the receiving cavity 104, the space inside the receiving cavity 104 can be fully utilized, the overall compactness of the battery pack can be improved, and interference from the composite layer structure 2 on the outer surface of the housing 1 with other parts or items can be avoided.

[0052] By setting a clearance groove 203 on the composite layer structure 2 to avoid the protruding rib 105, interference between the composite layer structure 2 and the protruding rib 105 can be avoided, so that the composite layer structure 2 can make better contact with the position of the support plate 101 where the protruding rib 105 is not set, thereby improving the impact resistance of the position of the support plate 101 where the protruding rib 105 is not set.

[0053] refer to Figures 1 to 6 As shown, in some embodiments provided by this utility model, the composite layer structure 2 includes a buffer layer 201 and a tensile layer 202 connected to each other.

[0054] In this configuration, the buffer layer 201 and the tensile layer 202 are stacked on the support plate 101 in the direction of approaching or moving away from the support plate 101. Furthermore, at least one of the buffer layer 201 and the tensile layer 202, which is closer to the support plate 101, is provided with a clearance groove 203. That is, at least the buffer layer 201 or the tensile layer 202 connected to the support plate 101 is provided with a clearance groove 203.

[0055] In this embodiment, the strength and impact resistance of the support plate 101 can be improved by providing the tensile layer 202. Specifically, the support plate 101 deforms when subjected to impact; for example, it typically bends or bulges in the direction of the receiving cavity 104. The tensile layer 202 can resist tensile stress and prevent excessive plastic deformation of the support plate 101, thereby suppressing bending or bulging of the support plate 101 and giving it better impact resistance.

[0056] At the same time, the tensile layer 202 can also disperse the stress on the support plate 101, avoid local stress concentration on the support plate 101, and reduce the risk of local damage.

[0057] By setting the buffer layer 201, the energy absorption effect can be achieved. That is, when the support plate 101 is impacted, the buffer layer 201 can absorb and buffer the load transmitted from the support plate 101 to the battery 3, thereby reducing the impact on the battery 3.

[0058] refer to Figure 1 As shown, optionally, the bottom shell assembly includes a first direction X, a second direction Y, and a third direction Z that intersect each other. For example, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The support plate 101 extends along the first direction X in the length direction and along the second direction Y in the width direction. The buffer layer 201 and the tensile layer 202 are stacked on the support plate 101 along the third direction Z.

[0059] refer to Figure 1 As shown, optionally, the through groove penetrates the buffer layer 201 or the tensile layer 202 along the third direction Z, and also penetrates the buffer layer 201 or the tensile layer 202 along the first direction X. That is, the through groove divides the buffer layer 201 or the tensile layer 202 into at least two independent assembly blocks, and the at least two assembly blocks are spaced apart along the second direction Y, with the space between two adjacent assembly blocks forming the through groove.

[0060] refer to Figure 4 and Figure 5As shown, optionally, the buffer layer 201 and the tensile layer 202 are stacked on the support plate 101, and at least one of the buffer layer 201 and the tensile layer 202 near the support plate 101 is provided with a relief groove 203, including:

[0061] The buffer layer 201 is connected to the support plate 101, and the tensile layer 202 is connected to the side of the buffer layer 201 away from the support plate 101, and at least the buffer layer 201 is provided with a relief groove 203. That is, the tensile layer 202 may not be provided with a relief groove 203 to improve the overall performance of the tensile layer 202, or the tensile layer 202 may be provided with a relief groove 203 to divide the tensile layer 202 into multiple independent assembly blocks, thereby reducing the processing difficulty of the tensile layer 202.

[0062] Alternatively, in other embodiments provided by this utility model, the buffer layer 201 and the tensile layer 202 are stacked on the support plate 101, and at least one of the buffer layer 201 and the tensile layer 202 near the support plate 101 is provided with a relief groove 203, including:

[0063] The tensile layer 202 is connected to the support plate 101, and the buffer layer 201 is connected to the side of the tensile layer 202 away from the support plate 101, and at least one clearance groove 203 is provided on the tensile layer 202. That is, the buffer layer 201 may not have a clearance groove 203 to improve the overall performance of the buffer layer 201, or the buffer layer 201 may have a clearance groove 203 to divide the buffer layer 201 into multiple independent assembly blocks, reducing the processing difficulty of the buffer layer 201.

[0064] Optionally, the buffer layer 201 and the tensile layer 202 are bonded together, and the buffer layer 201 or the tensile layer 202 is bonded together with the support plate 101.

[0065] In this embodiment, the adhesive is used to firmly connect the layers of material together, which can significantly improve the interfacial bonding force, ensure that the layers will not be relatively displaced during the transmission of external force, and improve the stability and reliability of the overall structure.

[0066] In addition, adhesive bonding can ensure that stress is evenly distributed between layers, avoiding local stress concentration, thereby improving the tensile and impact resistance of the overall structure.

[0067] Of course, the connection between the buffer layer 201 and the tensile layer 202, and between the buffer layer 201 or the tensile layer 202 and the support plate 101, is not limited to adhesive bonding. For example, the connection between the buffer layer 201 and the tensile layer 202, and between the buffer layer 201 or the tensile layer 202 and the support plate 101, can also be achieved by hot pressing, welding, or threaded fasteners.

[0068] refer to Figure 1 andFigure 2 As shown, in some embodiments provided by this utility model, at least one of the buffer layer 201 and the tensile layer 202 is at least two layers, and the buffer layer 201 and the tensile layer 202 are arranged alternately along the direction close to or away from the support plate 101.

[0069] In this embodiment, the buffer layer 201 and the tensile layer 202 are arranged alternately to form a sandwich structure, which has good mechanical stability. The buffer layer 201 can absorb and disperse the impact force, while the tensile layer 202 can enhance the overall tensile strength. The two work together to make the whole structure more stable when subjected to external forces.

[0070] In addition, the bonding interface in the sandwich structure can provide more energy dissipation paths, reduce the propagation rate of fatigue cracks, and improve the fatigue life of the overall structure.

[0071] Optionally, in the alternating arrangement of buffer layer 201 and tensile layer 202, at least the buffer layer 201 or tensile layer 202 connected to the support plate 101 is provided with the clearance groove 203.

[0072] refer to Figure 1 and Figure 2 As shown, in some embodiments of this utility model, the tensile layer 202 is configured as two layers, and the buffer layer 201 is disposed between the two tensile layers 202. One of the two tensile layers 202 is connected to the support plate 101, and the other is used to connect to the battery 3. For example, the buffer layer 201 is bonded between the two tensile layers 202, one of the two tensile layers 202 is bonded to the support plate 101, and the other is used to bond to the battery 3.

[0073] In this embodiment, the two tensile layers 202 can provide stronger tensile properties. Each tensile layer 202 can independently withstand tensile stress, and their combined effect can significantly improve the tensile strength of the overall structure.

[0074] The buffer layer 201 is located between the two tensile layers 202. It can effectively absorb and disperse impact energy and reduce the transmission of stress between the tensile layers 202, thereby helping to protect the tensile layers 202 and prevent them from being damaged by excessive stress.

[0075] Specifically, during the stress process, the support plate 101 transmits the impact to the first tensile layer 202, and then the energy is absorbed and dispersed by the buffer layer 201 to form a gradual stress gradient, so that the stress is gradually transmitted from the outer layer to the inner layer to avoid abrupt changes. Finally, the inner tensile layer 202 provides further support. The multi-layer protection mechanism can effectively reduce the deformation of the support plate 101 and improve the impact resistance.

[0076] In some embodiments provided by this utility model, the buffer layer 201 is configured as two layers, and the tensile layer 202 is disposed between the two buffer layers 201. One of the two buffer layers 201 is connected to the support plate 101, and the other is used to connect to the battery 3. For example, the tensile layer 202 is bonded between the two buffer layers 201, one of the two buffer layers 201 is bonded to the support plate 101, and the other is used to bond to the battery 3.

[0077] In this embodiment, after the support plate 101 is impacted, the outer buffer layer 201 first contacts the impact, absorbing and dispersing some of the energy; the middle tensile layer 202 provides high strength and high modulus to resist tensile stress; the inner buffer layer 201 further absorbs the remaining energy, protecting the battery 3. This multi-layer protection mechanism can effectively reduce the impact energy transmitted to the support plate 101 and improve the impact resistance of the overall structure.

[0078] In some embodiments provided by this utility model, the buffer layer 201 is configured as a polypropylene honeycomb core or an aluminum alloy honeycomb core.

[0079] In this embodiment, both the polypropylene honeycomb core and the aluminum alloy honeycomb core possess high strength and stiffness, providing excellent support and resisting external impacts and pressure. Both also exhibit excellent energy absorption characteristics, capable of absorbing and dispersing significant amounts of energy upon impact, reducing the transmission of impact force. Furthermore, the low density of both the polypropylene and aluminum alloy honeycomb cores contributes to the lightweight design of the base shell.

[0080] Of course, the buffer layer 201 can also be a foam layer. Foam material has excellent energy absorption properties and can absorb and disperse a large amount of energy when subjected to impact, reducing the impact force transmitted to the support plate 101.

[0081] Alternatively, the buffer layer 201 can also be a rubber layer, which can absorb and disperse a large amount of energy when subjected to impact, reducing the impact force transmitted from the support plate 101 to the battery 3. In addition, the rubber layer has high elasticity and can quickly return to its original shape after deformation without permanent deformation, so that the rubber layer can still maintain a good buffering effect after long-term use.

[0082] Alternatively, the buffer layer 201 can also be a foam material layer, such as foam or expanded foam. Foam materials have excellent energy absorption properties, capable of absorbing and dispersing a large amount of energy upon impact. In addition, the low density of foam materials makes the overall structure lighter.

[0083] In some embodiments of this invention, the tensile layer 202 is a steel plate. In this embodiment, the steel has high strength and can withstand large tensile and compressive forces, providing reliable support and protection for the battery 3. In addition to high strength, the steel also has good toughness and is not prone to brittle fracture when subjected to external forces.

[0084] Of course, the tensile layer 202 is not limited to steel plates. For example, in other embodiments, the tensile layer 202 is a fiberglass board. Fiberglass has high strength and toughness, and can withstand large tensile and compressive forces. When the battery 3 is subjected to external impact or compression, the fiberglass board can effectively resist deformation and protect the internal structure of the battery 3 from damage. The fiberglass board has a low density, and using a fiberglass board as the tensile layer 202 can reduce the overall weight of the battery 3.

[0085] In some embodiments of this invention, the housing 1 is a steel housing. In this embodiment, steel has high strength and can withstand greater tensile and compressive forces, providing reliable support and protection for the battery 3. In addition to high strength, steel also has good toughness and is not prone to brittle fracture when subjected to external forces.

[0086] Of course, the casing 1 can also be made of aluminum. Aluminum has a low density, and making the casing 1 of aluminum can reduce the overall weight of the battery 3.

[0087] Alternatively, the casing 1 can also be made of fiberglass. Fiberglass has high strength and toughness, and can withstand greater tensile and compressive forces. When the battery 3 is subjected to external impact or compression, the fiberglass can effectively resist deformation and protect the internal structure of the battery 3 from damage. Fiberglass has a low density, and using a fiberglass sheet as a tensile layer 202 can reduce the overall weight of the battery 3.

[0088] In some embodiments of this utility model, the housing 1 is configured as a stamped integral structure. By configuring the housing 1 as a stamped integral structure, a large number of bottom shells of the same shape and size can be produced in a short time, meeting the efficiency requirements of large-scale production. During the stamping process, through reasonable arrangement and optimized design of materials, the generation of waste can be reduced and the utilization rate of materials can be improved, thereby reducing the cost of the housing 1.

[0089] refer to Figure 1 As shown, in some embodiments provided by this utility model, the number of ribs 105 is set to at least two.

[0090] At least two raised ribs 105 are arranged alternately, and the arrangement direction of the raised ribs 105 intersects the extension direction of the raised ribs 105. For example, the raised ribs 105 extend along a first direction X, and at least two raised ribs 105 are arranged along a second direction Y.

[0091] In this embodiment, by providing at least two ribs 105, the load applied to the support plate 101 can be further dispersed, thereby reducing the deformation of the support plate 101, enabling the support plate 101 to better withstand pressure and impact, maintain its stability, and avoid excessive local stress leading to cracking or damage.

[0092] Optionally, the rib 105 can be a stamped rib. The stamping process enables high-precision forming of the rib, ensuring consistent dimensions and shape of the rib 105, thus improving product quality and reliability. In mass production, the stamped rib 105 maintains high consistency, reducing errors and improving production efficiency and product quality.

[0093] Optionally, the ribs 105 are used to mount the cooling plate, and the battery is disposed between two adjacent ribs 105, or between the ribs 105 and the surrounding plate. Specifically, one end of the cooling plate 4 is connected to the ribs 105, the other end of the cooling plate 4 is connected to the cover plate of the battery pack, and the side wall of the cooling plate abuts against the battery.

[0094] In this embodiment, the cooling plate 4 is connected between the rib 105 and the cover plate, which can strengthen the beam and significantly improve the rigidity of the support plate 101, preventing excessive deformation of the support plate 101 when subjected to impact or load. During the impact process, the support plate 101 can transfer the impact to the cooling plate 4, which can then offset or bear the impact, or the cooling plate 4 can transfer the impact to the cover plate, where it is offset or beard by the battery pack frame, thereby reducing the impact on the battery 3 inside the battery pack.

[0095] refer to Figure 1 As shown, in some embodiments provided by this utility model, the edge of the enclosure 102 away from the support plate 101 is provided with a flange 103, the flange 103 is folded toward the side of the enclosure 102 away from the receiving cavity 104, and the flange 103 is provided with a through connecting hole.

[0096] In this embodiment, a flange 103 is provided to facilitate mating with the cover plate of the battery pack. A connecting hole is provided to allow threaded fasteners to pass through the connecting hole and connect the cover plate and the flange 103.

[0097] refer to Figures 1 to 6 As shown, this utility model embodiment also provides a battery pack.

[0098] Specifically, the battery pack includes battery 3, cover plate and bottom shell assembly as described above.

[0099] The cover plate is connected to the end of the enclosure 102 away from the support plate 101, and the cover plate closes the receiving cavity 104. Optionally, the cover plate is connected to the flange 103 of the enclosure 102. Specifically, a threaded fastener passes through the connecting hole of the flange 103 and the cover plate, and connects the flange 103 and the cover plate.

[0100] The battery 3 is disposed in the receiving cavity 104 and connected to the surface of the composite layer structure 2 away from the support plate 101. For example, the battery 3 can be bonded to the composite layer structure 2.

[0101] In this embodiment, the battery pack includes a bottom housing assembly, which also includes all the advantages of the bottom housing assembly mentioned above, so it will not be described in detail here.

[0102] In some embodiments provided by this utility model, the battery pack further includes a cooling plate 4. Optionally, the cooling plate 4 is configured as a direct cooling plate or a liquid cooling plate.

[0103] The cooling plate 4 is located in the receiving cavity 104, with one end of the cooling plate 4 connected to the protruding rib 105 and the other end of the cooling plate 4 connected to the cover plate. The side wall of the cooling plate 4 abuts against the battery 3.

[0104] In this embodiment, a cooling plate 4 is provided, which can be used to regulate the temperature of the battery 3 to prevent the temperature of the battery 3 from being too high or too low, thereby ensuring the charging and discharging performance of the battery 3.

[0105] The cooling plate 4 is connected between the rib 105 and the cover plate, which can strengthen the beam and thus significantly improve the rigidity of the support plate 101, preventing the support plate 101 from deforming excessively when subjected to impact or load.

[0106] In addition, during the impact process of the support plate 101, the support plate 101 can transfer the impact to the cooling plate 4, which can offset or bear the impact, or the cooling plate 4 can transfer the impact to the cover plate, which can be offset or bear the impact by the battery pack frame, thereby reducing the impact on the battery 3 inside the battery pack.

[0107] Optionally, the sidewall of the cooling plate 4 can be bonded to the battery 3 to provide positioning and support for the battery 3, preventing the battery 3 from shaking or shifting within the battery pack, thereby improving the stability of the battery 3 inside the battery pack.

[0108] Optionally, refer to Figure 4 As shown, with both the buffer layer 201 and the tensile layer 202 in the composite layer structure 2 having clearance grooves 203, the cooling plate 4 can pass through the clearance grooves 203 and connect with the rib 105. It can be understood that the clearance grooves 203 in both the buffer layer 201 and the tensile layer 202 in the composite layer structure 2 mean that the clearance grooves 203 penetrate the composite layer structure 2 in the third direction Z.

[0109] Optionally, refer to Figure 5 As shown, in the composite layer structure 2, with only a portion of the buffer layer 201 or tensile layer 202 having clearance grooves 203, the cooling plate 4 is positioned opposite to the rib 105, and the cooling plate 4 is connected to the surface of the composite layer structure 2 away from the support plate 101, meaning the cooling plate 4 is connected to the rib 105 through the composite layer structure 2. It can be understood that the clearance grooves 203 in the composite layer structure 2, where only a portion of the buffer layer 201 or tensile layer 202 has clearance grooves 203, mean that the clearance grooves 203 do not penetrate the composite layer structure 2 in the third direction Z.

[0110] In some embodiments provided by this utility model, the cooling plate 4 and the cover plate are detachably connected by at least one of the ribs 105. For example, one end of the cooling plate 4 is detachably connected to the rib 105, and the other end of the cooling plate 4 is detachably connected to the cover plate.

[0111] In this embodiment, the reinforcing beam is connected to the rib 105 to form an integrated reinforcing system, which can better disperse and transmit external forces and improve the overall structural strength. Similarly, the connection between the reinforcing beam and the cover plate can also form an integrated reinforcing system, which can better disperse and transmit external forces and improve the overall structural strength.

[0112] In addition, the cooling plate 4 can be easily disassembled or replaced.

[0113] Optionally, the cooling plate 4 is detachably connected to the rib 105 by a threaded fastener. Specifically, the threaded fastener passes through the cooling plate 4 and the composite layer structure 2 and is connected to the rib 105, or the threaded fastener passes through the rib 105 and the composite layer structure 2 and is connected to the cooling plate 4.

[0114] Optionally, the cooling plate 4 is detachably connected to the cover plate by threaded fasteners. Specifically, the threaded fasteners pass through the cooling plate 4 and are connected to the cover plate, or the threaded fasteners pass through the cover plate and are connected to the cooling plate 4.

[0115] This utility model also provides a vehicle in its embodiments.

[0116] Specifically, the vehicle includes the aforementioned underbody assembly or the aforementioned battery pack.

[0117] It should be noted that the vehicle includes the underbody assembly or battery pack, which also includes the corresponding advantages, so this will not be elaborated further.

[0118] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A bottom shell assembly, characterized in that, include: The housing (1) includes a support plate (101) and a surrounding plate (102). The surrounding plate (102) extends along the edge of the support plate (101) and is connected to the support plate (101) to form a receiving cavity (104). The surface of the support plate (101) facing the receiving cavity (104) is provided with a rib (105). A composite layer structure (2) is provided in the receiving cavity (104) and is connected to the support plate (101). A relief groove (203) is provided at the position opposite to the rib (105) of the composite layer structure (2), and the relief groove (203) is used to avoid the rib (105).

2. The bottom shell assembly according to claim 1, characterized in that, The composite layer structure (2) includes a buffer layer (201) and a tensile layer (202) connected to each other; In the direction of approaching or away from the support plate (101), the buffer layer (201) and the tensile layer (202) are stacked on the support plate (101), and at least one of the buffer layer (201) and the tensile layer (202) near the support plate (101) is provided with the clearance groove (203).

3. The bottom shell assembly according to claim 2, characterized in that, The number of at least one of the buffer layer (201) and the tensile layer (202) is at least two, and the buffer layer (201) and the tensile layer (202) are alternately distributed along the direction close to or away from the support plate (101).

4. The bottom shell assembly according to claim 2, characterized in that, The buffer layer (201) is configured as a polypropylene honeycomb core, an aluminum alloy honeycomb core, a foam layer, a rubber layer, or a foamed material layer; And / or, the tensile layer (202) is made of steel plate or fiberglass board; And / or, the housing (1) is configured as a steel housing, an aluminum housing or a fiberglass housing; And / or, the housing (1) is configured as a stamped integral structure.

5. The bottom shell assembly according to any one of claims 1-4, characterized in that, The number of the ribs (105) is set to at least two, and the at least two ribs (105) are arranged alternately, and the arrangement direction of the ribs (105) intersects the extension direction of the ribs (105).

6. The bottom shell assembly according to any one of claims 1-4, characterized in that, The edge of the enclosure (102) away from the support plate (101) is provided with a flange (103), the flange (103) is folded towards the side of the enclosure (102) away from the receiving cavity (104), and the flange (103) is provided with a through connecting hole.

7. A battery pack, characterized in that, include: The bottom shell assembly as described in any one of claims 1-6; A cover plate is connected to the end of the enclosure plate (102) away from the support plate (101) and closes the receiving cavity (104); The battery (3) is disposed in the receiving cavity (104) and connected to the surface of the composite layer structure (2) opposite to the support plate (101).

8. The battery pack according to claim 7, characterized in that, The battery pack also includes a cooling plate (4), which is disposed in the receiving cavity (104). One end of the cooling plate (4) is connected to the rib (105), and the other end of the cooling plate (4) is connected to the cover plate. The side wall of the cooling plate (4) abuts against the battery (3).

9. The battery pack according to claim 8, characterized in that, The cooling plate (4) is detachably connected to at least one of the cover plate and the rib (105).

10. A vehicle, characterized in that, Includes the base assembly as described in any one of claims 1-6 or the battery pack as described in any one of claims 7-9.

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