Battery pack and vehicle

Abstract

The embodiment of the application provides a battery pack and a vehicle, and relates to the technical field of batteries. The battery pack comprises a tray, a battery cell, a bottom plate and a buffer. The bottom plate is arranged at the bottom of the tray; the bottom plate comprises a first bottom plate section and a second bottom plate section; the first bottom plate section and the second bottom plate section are oppositely arranged along the height direction of the battery pack; the first bottom plate section is arranged close to the accommodating cavity relative to the second bottom plate section; the surface of the first bottom plate section is provided with the battery cell; the installation area is formed between the first bottom plate section and the second bottom plate section; and the buffer is located in the installation area. The battery pack provided by the embodiment of the application can maintain the installation support stability of the battery cell, the second bottom plate section can bear the impact from the external environment, and the buffer establishes an elastic transition and energy attenuation path between the two, so that the bearing, protection and buffering functions are hierarchically configured in the structure, the external impact is prevented from being directly transmitted to the battery cell by the single-layer bottom plate, and the impact resistance of the bottom plate is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery pack and a vehicle. Background Technology

[0002] New energy vehicles must withstand external impacts, vibrations, and environmental erosion under complex road conditions (such as bumpy roads, water crossings, and high-speed driving).

[0003] In related technologies, a battery pack includes a tray, a base plate, and battery cells. The tray and the base plate together form a receiving cavity, in which the battery cells are located. The base plate is a metal plate.

[0004] However, the existing base plate has insufficient impact resistance. Summary of the Invention

[0005] This application provides a battery pack and vehicle that improves the impact resistance of the battery pack base plate.

[0006] In a first aspect, embodiments of this application provide a battery pack, comprising:

[0007] Tray, the tray has a receiving cavity;

[0008] The battery cell is located within the housing cavity;

[0009] A base plate is disposed at the bottom of the tray; the base plate includes a first base plate segment and a second base plate segment; the first base plate segment and the second base plate segment are disposed opposite each other along the height direction of the battery pack; the first base plate segment is disposed close to the receiving cavity relative to the second base plate segment; a battery cell is disposed on the surface of the first base plate segment; an installation area is formed between the first base plate segment and the second base plate segment;

[0010] The buffer is located in the installation area.

[0011] In one possible implementation, an elastic layer is provided on the surface of the second base plate segment facing away from the first base plate segment.

[0012] In one possible implementation, the second base plate segment is provided with a plurality of recesses; the recesses are recessed inward relative to the second base plate segment toward the side closer to the first base plate segment.

[0013] Multiple recesses are arranged in an array on the second bottom plate section.

[0014] In one possible implementation, an insulating layer is provided on the surface of the first base plate segment.

[0015] In one possible implementation, the surface of the first base plate segment is provided with an anti-corrosion layer.

[0016] In one possible implementation, the pallet includes a pallet body and a first beam; the pallet body forms a receiving cavity; the first beam is located in the receiving cavity.

[0017] The first beam extends along a first direction intersecting the height of the battery pack; both ends of the first beam are connected to the tray body respectively.

[0018] The battery pack also includes a second beam located in the receiving cavity, the second beam extending along a second direction intersecting the height of the battery pack; the second beam is connected to the first beam; and there is a gap between the second beam and the battery cell.

[0019] The first and second directions intersect.

[0020] In one possible implementation, the battery pack further includes a heat-conducting element, a portion of which is disposed between the battery cell and the first base plate segment.

[0021] The heat-conducting part is located in the gap.

[0022] Along the height direction of the battery pack, the extension length of the second beam is not less than the extension length of the heat-conducting component.

[0023] In one possible implementation, the battery pack further includes a first fastener, a second fastener, and a sealing connector.

[0024] The first fastener connects the second beam and the first base plate segment, and a sealing connector is provided at the connection between the first fastener and the second beam and the base plate segment.

[0025] The second fastener connects the first beam and the first base plate segment and the second base plate segment; a sealing connector is provided at the connection between the second fastener and the first beam and the base plate.

[0026] The base plate and the pallet body are sealed together by a sealing connector.

[0027] In one possible implementation, the thickness of the first base plate segment is W, where W satisfies: 0.8mm ≤ W ≤ 2.0mm.

[0028] In one possible implementation, the thermal conductivity of the heat-conducting element is k, which satisfies: k≥1.5W / (m·K).

[0029] In one possible implementation, the first base plate segment includes at least one of a steel plate and an aluminum plate.

[0030] In one possible implementation, the elastic layer includes at least one of a polyvinyl chloride anti-stone chip coating, a polyurethane elastomer coating, and a polyurea elastomer coating.

[0031] In one possible implementation, the thermally conductive component includes at least one of thermally conductive gel and thermally conductive structural adhesive.

[0032] The cushioning component includes at least one of foam, foamed rubber, and elastomer gasket.

[0033] Secondly, embodiments of this application provide a vehicle including the aforementioned battery pack.

[0034] This application provides a battery pack and a vehicle. The battery pack includes a tray, battery cells, a base plate, and a buffer. The tray has a receiving cavity; the battery cells are located in the receiving cavity; the base plate is disposed at the bottom of the tray; the base plate includes a first base plate segment and a second base plate segment; the first base plate segment and the second base plate segment are disposed opposite each other along the height direction of the battery pack; the first base plate segment is disposed close to the receiving cavity relative to the second base plate segment; the battery cells are disposed on the surface of the first base plate segment; an installation area is formed between the first base plate segment and the second base plate segment; the buffer is located in the installation area.

[0035] The battery pack provided in this application embodiment sets the base plate as a first base plate segment and a second base plate segment arranged opposite to each other along the height direction of the battery pack, and forms an installation area for arranging buffer components between the two. This allows the first base plate segment located inside the battery pack to maintain the stability of the battery cell installation support, while the second base plate segment located outside the battery pack can preferentially withstand the impact from the external environment. The buffer component in the installation area establishes an elastic transition and energy attenuation path between the two, thereby structurally configuring the load-bearing, protection and buffering functions in layers, avoiding the direct transmission of external impact to the battery cell by a single base plate, and improving the impact resistance of the base plate.

[0036] In this embodiment, when the vehicle is in motion, the battery cell is fixedly installed in the receiving cavity of the tray. The first bottom plate section serves as the supporting foundation for the battery cell, maintaining the stability of the battery cell's posture. The bottom plate and the tray together form a closed bottom boundary. When the vehicle passes over potholes, speed bumps, gravel roads, or is subjected to bottoming impact, the outer second bottom plate section first bears the external force and undergoes limited elastic deformation. The buffer in the installation area is compressed accordingly. The impact energy is dispersed and attenuated by the elastic recovery of the buffer material itself and the internal friction energy dissipation, thereby reducing the peak value of the load transmitted to the first bottom plate section and keeping the supporting surface of the inner first bottom plate section as stable as possible under stress.

[0037] Since the first base plate segment and the second base plate segment are spatially opposite and isolated by a buffer, external local impacts are less likely to form a direct and continuous rigid transmission path on the base plate surface. Therefore, the amplification effect of local deformation of the base plate to the cell mounting interface can be reduced, which helps to maintain the consistency of the cell mounting reference and reduce the risk of structural mismatch caused by vibration fatigue or residual stress. Attached Figure Description

[0038] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0039] Figure 1A schematic diagram of the battery pack structure provided in the embodiments of this application. Figure 1 ;

[0040] Figure 2 A schematic diagram of the battery pack structure provided in the embodiments of this application. Figure 2 ;

[0041] Figure 3 for Figure 2 A magnified view of a portion of region P.

[0042] Explanation of reference numerals in the attached figures:

[0043] 100, Pallet; 110, Pallet body; 120, First beam; 200, Battery cell; 300, Base plate; 310, First base plate section; 320, Second base plate section; 400, Buffer; 500, Second beam; 510, Gap; 600, Heat-conducting component; 700, First fastener; 800, Second fastener; 900, Sealing connector.

[0044] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0045] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0046] As the core of the vehicle's power system, the structural design of the power battery box in new energy vehicles directly affects the vehicle's safety, energy efficiency, and range.

[0047] As battery technology advances towards higher energy density, Cell to Pack (CTP) technology is gradually becoming mainstream. This technology eliminates the need for traditional module structures, integrating the cells directly into the battery pack, thereby significantly improving the space utilization and energy density of the battery pack.

[0048] Currently, CTP battery packs using natural cooling methods typically employ a single-layer welded base plate as both a load-bearing and sealing component. The battery cells are directly placed within the housing space above the base plate, which is then welded or circumferentially connected to a tray to form an integral structure.

[0049] However, in practical use, this solution has revealed significant shortcomings. When a vehicle travels over potholes, speed bumps, gravel roads, or bottoms out, localized areas of the single-layer floor plate are susceptible to concentrated impact, leading to substantial deformation of the plate surface. In severe cases, the impact load can be directly transmitted to the internal battery cells, affecting not only their positioning stability but also potentially causing pressure buildup, short circuits, or even thermal runaway, thereby weakening the overall structural safety and reliability of the package.

[0050] In summary, the existing base plate structure of battery packs has poor performance in terms of impact resistance and cell protection, and there is an urgent need to optimize its structure.

[0051] In view of this, embodiments of this application provide a battery pack and a vehicle, the battery pack including a tray, battery cells, a base plate, and a buffer. The tray has a receiving cavity; the battery cells are located in the receiving cavity; the base plate is disposed at the bottom of the tray; the base plate includes a first base plate segment and a second base plate segment; the first base plate segment and the second base plate segment are disposed opposite to each other along the height direction of the battery pack; the first base plate segment is disposed close to the receiving cavity relative to the second base plate segment; the battery cells are disposed on the surface of the first base plate segment; an installation area is formed between the first base plate segment and the second base plate segment; the buffer is located in the installation area.

[0052] The battery pack provided in this application embodiment sets the base plate as a first base plate segment and a second base plate segment arranged opposite to each other along the height direction of the battery pack, and forms an installation area for arranging buffer components between the two. This allows the first base plate segment located inside the battery pack to maintain the stability of the battery cell installation support, while the second base plate segment located outside the battery pack can preferentially withstand the impact from the external environment. The buffer component in the installation area establishes an elastic transition and energy attenuation path between the two, thereby structurally configuring the load-bearing, protection and buffering functions in layers, avoiding the direct transmission of external impact to the battery cell by a single base plate, and improving the impact resistance of the base plate.

[0053] When the vehicle is in motion, the battery cells are fixedly installed within the tray's cavity. The first base plate section serves as the supporting foundation for the battery cells, maintaining their stable posture. The base plate and the tray together form a closed bottom boundary. When the vehicle passes over potholes, speed bumps, gravel roads, or experiences a bottoming impact, the outer second base plate section first bears the external force and undergoes limited elastic deformation. The buffer within the installation area is then compressed. The impact energy is dispersed and attenuated through the elastic recovery of the buffer material itself and the energy dissipation from internal friction, thereby reducing the peak load transmitted to the first base plate section and keeping the support surface of the inner first base plate section as stable as possible.

[0054] Since the first base plate segment and the second base plate segment are spatially opposite and isolated by a buffer, external local impacts are less likely to form a direct and continuous rigid transmission path on the base plate surface. Therefore, the amplification effect of local deformation of the base plate to the cell mounting interface can be reduced, which helps to maintain the consistency of the cell mounting reference and reduce the risk of structural mismatch caused by vibration fatigue or residual stress.

[0055] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0056] Firstly, referring to Figures 1 to 3 As shown, this application embodiment provides a battery pack, including:

[0057] Tray 100, tray 100 has a receiving cavity;

[0058] Battery cell 200 is located in the receiving cavity;

[0059] A base plate 300 is disposed at the bottom of the tray 100; the base plate 300 includes a first base plate segment 310 and a second base plate segment 320; the first base plate segment 310 and the second base plate segment 320 are disposed opposite each other along the height direction of the battery pack; the first base plate segment 310 is disposed close to the receiving cavity relative to the second base plate segment 320; a battery cell 200 is disposed on the surface of the first base plate segment 310; an installation area is formed between the first base plate segment 310 and the second base plate segment 320;

[0060] Buffer 400 is located in the installation area.

[0061] For example, tray 100 is a carrier housing for the battery pack, and tray 100 has a receiving cavity for accommodating the battery cell 200 and its associated components. The function of tray 100 is to provide the battery pack with an overall mounting boundary, load-bearing support, and external isolation.

[0062] The battery cell 200 is disposed in the receiving cavity and is a functional unit for storing and releasing electrical energy.

[0063] The base plate 300 is located at the bottom of the tray 100. As the bottom load-bearing and protective structure of the battery pack, the base plate 300 is mainly used to withstand road stone impacts, bottom collisions, splash impacts, and long-term vibration loads, and works with the tray 100 to form a bottom seal of the receiving cavity.

[0064] The base plate 300 includes a first base plate segment 310 and a second base plate segment 320. Along the height direction of the battery pack, the first base plate segment 310 and the second base plate segment 320 are arranged opposite to each other, wherein the first base plate segment 310 forms a support surface for supporting the battery cell 200 on the side facing the receiving cavity.

[0065] The first base plate section 310 is positioned closer to the receiving cavity than the second base plate section 320. This allows the first base plate section 310 to primarily serve as the mounting reference and internal support for the battery cell 200, while the second base plate section 320 primarily serves as external impact protection and environmental isolation.

[0066] An installation area is formed between the first base plate segment 310 and the second base plate segment 320. The installation area is used to accommodate the buffer 400. The formation of the installation area allows the base plate 300 to have limited elastic deformation conditions in the overall thickness direction.

[0067] The buffer 400 is located in the mounting area. The buffer 400 provides elastic support, vibration absorption, and impact energy attenuation when external impacts, vibrations, or bottom loads are transmitted to the base plate 300, thereby reducing the degree to which the load is directly transmitted to the inner first base plate section 310 and the battery cell 200. At the same time, the buffer 400 can reduce abnormal noise.

[0068] The battery pack provided in this application embodiment sets the base plate 300 into a first base plate segment 310 and a second base plate segment 320 arranged opposite to each other along the height direction of the battery pack, and forms an installation area for arranging the buffer 400 between the two. This allows the first base plate segment 310 located inside the battery pack to maintain the installation support stability of the battery cell 200, while the second base plate segment 320 located outside the battery pack can preferentially withstand the impact from the external environment. The buffer 400 in the installation area establishes an elastic transition and energy attenuation path between the two, thereby structurally configuring the load-bearing, protection and buffering functions in layers, avoiding the direct transmission of external impact to the battery cell 200 by a single base plate 300.

[0069] In this embodiment, when the vehicle is in motion, the battery cell 200 is fixedly installed in the receiving cavity of the tray 100. The first base plate section 310 serves as the supporting foundation for the battery cell 200, maintaining the stability of the battery cell 200's posture. The base plate 300 and the tray 100 together form a closed bottom boundary. When the vehicle passes over potholes, speed bumps, gravel roads, or is subjected to bottoming impact, the outer second base plate section 320 first bears the external force and undergoes limited elastic deformation. The buffer 400 in the installation area is compressed accordingly. The impact energy is dispersed and attenuated by the elastic recovery of the buffer 400 material itself and the internal friction energy dissipation, thereby reducing the peak value of the load transmitted to the first base plate section 310 and keeping the supporting surface of the inner first base plate section 310 as stable as possible under stress.

[0070] Since the first base plate segment 310 and the second base plate segment 320 are spatially opposite to each other and isolated by the buffer 400, external local impacts are less likely to form a direct and continuous rigid transmission path on the surface of the base plate 300. Therefore, the amplification effect of local deformation of the base plate 300 to the battery cell 200 mounting interface can be reduced, which helps to maintain the consistency of the battery cell 200 mounting reference and reduce the risk of structural mismatch caused by vibration fatigue or residual stress.

[0071] Meanwhile, after the base plate 300 adopts a layered structure, the first base plate section 310 and the second base plate section 320 can be designed according to functional requirements in terms of material thickness, reinforcement arrangement and forming method. This makes the structure of the second base plate section 320 focus on impact resistance and wear protection, while the structure of the first base plate section 310 focuses on flatness maintenance and support stability. In this way, assembly accuracy, bottom protection and overall package reliability can be taken into account without significantly increasing the structural complexity.

[0072] As one possible implementation, the buffer 400 includes at least one of foam, foamed rubber, and elastomer pads.

[0073] The foam can be made of EVA (Ethylene Vinyl Acetate), PU (Polyurethane) or EPDM (Ethylene Propylene Diene Monomer), which have good compressibility and resilience.

[0074] Foamed rubber can be made of rubber foam sheets to balance aging resistance and cushioning performance.

[0075] Elastomer gaskets can be made of silicone, rubber, or other highly elastic polymers to form pre-tightened supports within the installation area.

[0076] The buffer 400 is usually set locally or entirely along the installation area. It can cooperate with the gap between the first base plate section 310 and the second base plate section 320 to form an elastic support relationship that rebounds after being compressed. In this way, when the base plate 300 is subjected to a downward impact, it absorbs part of the load and weakens the transmission of the impact to the cell 200.

[0077] The buffer element 400 can be in the form of a block, strip, sheet, or segmented arrangement, or it can be set in a ring, rectangle, or multi-point distribution form according to the geometry of the installation area.

[0078] During operation, after the battery cell 200 is assembled into the receiving cavity of the tray 100, the first bottom plate section 310 serves as a supporting interface and cooperates with the bottom of the battery cell 200. The heat-conducting component 600 fills the interface and gap 510 area between the battery cell 200 and the first bottom plate section 310, so that when the battery cell 200 generates heat during charging and discharging, it can be quickly transferred to the first bottom plate section 310 through the heat-conducting component 600 and diffused outward. At the same time, the buffer component 400 in the installation area is compressed and deformed when the vehicle vibrates or the bottom is impacted, absorbing and dissipating some mechanical energy in advance, and avoiding the load from being directly concentrated on the battery cell 200 and the heat-conducting interface.

[0079] The second bottom plate section 320 is located on the side away from the receiving cavity. Its outer surface elastic layer provides elastic buffering and maintains the integrity of the outer surface when it is hit by gravel, scraped at the bottom, or corroded by the environment, thereby reducing the risk of plate wear and corrosion.

[0080] Based on the above-mentioned synergistic relationship, the base plate 300 structure in this application can take into account heat transfer, bottom protection and impact buffering under natural cooling conditions, making the cell 200 mounting reference more stable, the heat diffusion path more continuous, and the impact of external disturbances on the internal cell 200 less, thereby improving the overall reliability, service life and service safety of the battery pack.

[0081] As one feasible implementation, an elastic layer is provided on the surface of the second base plate segment 320 facing away from the first base plate segment 310.

[0082] For example, the elastic layer is a functional surface layer disposed on the outer surface of the second base plate segment 320.

[0083] The elastic layer is made of a material with a certain elastic modulus, impact resistance and wear resistance.

[0084] The elastic layer is used to absorb some of the impact energy when the battery pack is subjected to external impacts such as stone blows, gravel impacts, road surface scraping, or bottom contact, thereby reducing the direct effect of external loads on the second bottom plate section 320 substrate.

[0085] The elastic layer is disposed on the side of the second floor section 320 away from the first floor section 310, which faces the external environment under the vehicle. Therefore, the coating forms a direct contact interface with road debris, foreign objects and ground obstacles, and is fixed to the surface of the second floor section 320 by adhesion to form a continuous protective layer.

[0086] During operation, when the vehicle travels on uneven roads, speed bumps, gravel roads, or when it bottoms out, the second base plate section 320 located on the outer side of the bottom of the battery pack is first subjected to impact, friction, or compression from the outside. The elastic layer on the outer surface of the second base plate section 320 then undergoes elastic compression, local deformation, or surface micro-energy-dissipating deformation, converting part of the impact load into deformation energy and heat energy inside the coating, thereby reducing the peak of load transmission to the substrate and internal structure of the second base plate section 320.

[0087] At the same time, because the elastic layer has a certain resilience, it can restore its original shape after the external force is removed, thus avoiding continuous dents or exposed damage at the impact point.

[0088] As a result, the stone impact resistance, wear resistance and bottoming resistance of the outer surface of the second base plate section 320 are improved, the surface integrity and structural stability of the base plate 300 substrate are maintained, which further helps to maintain the overall sealing state of the base plate 300 and the fitting accuracy between it and the tray 100 and the buffer 400, and reduces the cumulative effect of external impact on fatigue damage to the bottom structure.

[0089] Based on the above analysis, it can be seen that setting an elastic layer can improve the bottom protection capability and service reliability of the battery pack without significantly increasing the structural complexity of the base plate 300, and play a positive role in the long-term safety of the naturally cooled battery pack under complex road conditions.

[0090] As one possible implementation, the elastic layer includes at least one of a polyvinyl chloride anti-stone chip coating, a polyurethane elastomer coating, and a polyurea elastomer coating.

[0091] Polyvinyl chloride anti-stone impact coating, polyurethane elastomer coating, and polyurea elastomer coating are all external protective materials with good elastic recovery and wear resistance.

[0092] Among them, polyvinyl chloride (PVC) anti-stone chip coatings can be applied by spraying, scraping, or lamination to form a continuous protective layer. Polyurethane elastomer coatings can be applied using two-component curing or prepolymer spraying methods. Polyurea elastomer coatings can be applied by rapid curing spraying to form a dense, elastic surface.

[0093] After the elastic layer forms a covering layer on the surface of the second bottom plate section 320, it can absorb some of the impact energy through its own elastic deformation when the vehicle is hit by gravel, scraped by bottom debris, or slightly scraped during driving, and reduce the probability of direct damage to the metal substrate.

[0094] As one possible implementation, the second base plate segment 320 is provided with a plurality of recesses; the recesses are recessed inward relative to the second base plate segment 320 toward the side closer to the first base plate segment 310.

[0095] Multiple recesses are arranged in an array on the second bottom plate section 320.

[0096] For example, by providing multiple recesses that are concave towards one side of the first base plate segment 310 on the second base plate segment 320 and arranging them in an array, a three-dimensional undulating structure is formed in the thickness direction of the second base plate segment 320. This structure effectively increases the moment of inertia of the section of the second base plate segment 320 and improves the bending stiffness of the second base plate segment 320 in the vertical direction.

[0097] When the bottom of the battery pack is subjected to concentrated impacts from road surface gravel, speed bumps, or bottoming out, the recessed structure can transform the local point contact impact into a common load-bearing structure across multiple surfaces, significantly reducing the local deformation of the bottom plate 300 in the impact area. This reduces the direct transmission of impact loads to the internal cells 200, thereby improving the overall safety and reliability of the pack.

[0098] Flat thin plates are prone to overall or local buckling under compression or bending conditions. In this application, the array of recesses is equivalent to setting multiple discrete constraint points on the second base plate segment 320, dividing the large area of ​​the second base plate segment 320 into multiple independent small regions. The critical buckling stress of each region is significantly increased, thereby effectively delaying or inhibiting the occurrence of plate buckling.

[0099] Meanwhile, when extreme loads cause plastic deformation of the base plate 300, the recessed structure can guide the deformation to be concentrated at the bottom or edge of the recess rather than in the contact area of ​​the battery cell 200, further protecting the battery cell 200 from the risk of compression or puncture.

[0100] Compared to increasing the thickness of the base plate by 300mm or adding additional reinforcing beams, the array-type concave recesses used in this application can be directly formed on the original sheet material through a stamping process, with almost no increase in material usage or overall weight.

[0101] Under the same plate thickness, this recessed structure can significantly improve the local stiffness and impact resistance of the second bottom plate section 320, and has the advantage of high stiffness / weight ratio, making it particularly suitable for CTP battery pack structures with high energy density requirements.

[0102] Because the recessed structure makes the actual surface area of ​​the second base plate section 320 larger than its projected area, it can improve the heat exchange efficiency between the base plate 300 and the external environment to a certain extent in natural cooling or bottom auxiliary heat dissipation schemes, and improve the temperature distribution at the bottom of the cell 200.

[0103] In addition, under conditions of overall torsion or bending of the battery pack (such as torsion during vehicle operation), the recessed structure can serve as a local flexible deformation area to absorb some strain energy, alleviate fatigue stress at the connection between the base plate 300 and the housing (such as at welded or bolted connections), and improve the overall structural durability.

[0104] The depression includes at least one of the following: circular depression, rectangular or waist-shaped depression, elliptical depression, and regular polygonal depression.

[0105] The second base plate segment 320 can be formed by stamping, deep drawing or molding to obtain multiple recesses.

[0106] As one feasible implementation, an insulating layer is provided on the surface of the first base plate segment 310. The insulating layer is an electrical isolation functional layer provided on the surface of the first base plate segment 310. The insulating layer is used to reduce the risk of electrical coupling between the first base plate segment 310 and the battery cell 200, and between the first base plate segment 310 and external conductive components.

[0107] In one possible embodiment, the insulating layer is located on the side of the first base plate segment 310 close to the receiving cavity and directly adjacent to the cell 200. Therefore, the insulating layer on the surface of the first base plate segment 310 can improve the insulation safety margin of the bottom area of ​​the cell 200 and reduce the possibility of creepage, short circuit or partial discharge under humid, condensation or impurity adhesion conditions.

[0108] The insulation layer can be either a spray-applied insulating varnish film or an insulating ceramic coating.

[0109] As one feasible implementation, the surface of the first base plate segment 310 is provided with an anti-corrosion layer.

[0110] The anti-corrosion layer is an environmentally resistant protective layer applied to the surface of the first base plate section 310 to prevent water vapor, salt spray, acid and alkali media and other corrosive media from eroding the substrate of the first base plate section 310.

[0111] The anti-corrosion layer enables the first base plate section 310 to maintain structural integrity and surface stability when subjected to environmental humidity, salt spray and condensation inside the battery pack for a long time.

[0112] The anti-corrosion layer can be an anti-corrosion paint layer.

[0113] Specifically, during operation, the first base plate segment 310 is located below the battery cell 200 and continuously bears the loads from the battery cell 200, the tray 100, and the external environment. The insulation layer, by stably adhering to the surface of the first base plate segment 310, maintains electrical isolation between conductive components, thereby reducing the probability of electrical failure in the bottom area. The anti-corrosion layer forms a barrier when water vapor, salt spray, and chemical media come into contact with the surface of the base plate 300, inhibiting the occurrence of substrate oxidation, rust, or electrochemical corrosion. Since both are functional thin layers adhering to the surface, they can maintain good adhesion stability under temperature cycling, vehicle vibration, and long-term service conditions. Therefore, the environmental adaptability and service reliability of the first base plate segment 310 can be improved without significantly increasing structural complexity, and the long-term stable operation of the base plate segment 300 below the battery cell 200 can be further protected, reducing the risk of sealing degradation, structural weakening, and safety risks caused by insulation failure or corrosion deterioration.

[0114] As one feasible implementation, the thickness of the first base plate segment 310 is W, where W satisfies: 0.8mm≤W≤2.0mm.

[0115] The thickness W of the first base plate section 310 is a structural parameter used to limit the load-bearing capacity, forming stability and heat transfer capacity of the base plate 300. The first base plate section 310 is used as the supporting foundation of the battery cell 200. Its thickness directly affects the bending stiffness and local anti-dentation ability of the base plate 300 under pressure, vibration and impact conditions, and also affects the overall package weight and material usage.

[0116] In this application, the thickness of the first base plate segment 310 is W, and W satisfies: 0.8mm≤W≤2.0mm.

[0117] As a large sheet metal component in the battery pack, the weight of the first base plate segment 310 varies with its thickness. Setting the thickness of the first base plate segment 310 between 0.8mm and 2.0mm can minimize structural weight while meeting basic mechanical requirements, which is beneficial for improving the overall vehicle range.

[0118] The thermal resistance of the first base plate segment 310 is directly proportional to its thickness. The smaller the thickness, the lower the thermal resistance, and the easier it is for the heat from the bottom of the cell 200 to be conducted to the lower surface of the base plate 300 and dissipated outwards. When the thickness of the first base plate segment 310 is between 0.8mm and 2.0mm, the thermal resistance is at a relatively low level.

[0119] Conversely, when the thickness of the first base plate section 310 is less than 0.8mm, the base plate 300 is prone to overall flexural deformation under the weight of the battery cell 200 and vibration load.

[0120] When the thickness of the first base plate segment 310 exceeds 2.0mm, the excessive thickness significantly increases the mass of the base plate 300. For CTP battery packs, any increase in the mass of inactive materials directly reduces the overall energy density (energy storage capacity per unit mass / volume), thereby shortening the vehicle's driving range. An excessively thick base plate 300 violates the core design principle of lightweight battery packs.

[0121] In natural cooling or air cooling solutions that primarily rely on bottom heat dissipation, the first base plate segment 310 is the main path for heat conduction from the battery cell 200 to the external environment. The greater the thickness of the base plate 300, the higher its inherent thermal resistance (thermal resistance is proportional to thickness). The heat generated by the battery cell 200 is difficult to dissipate in time, causing the operating temperature of the battery cell 200 to rise, accelerating the aging of the battery cell 200, and increasing the risk of thermal runaway.

[0122] Therefore, in this application, the thickness W of the first base plate segment 310 satisfies: 0.8mm≤W≤2.0mm.

[0123] As one possible implementation, the first base plate segment 310 includes at least one of a steel plate and an aluminum plate. The first base plate segment 310 is used to form the main load-bearing structure at the bottom of the battery pack, and the first base plate segment 310 can be made of a steel plate or an aluminum plate.

[0124] The steel plates can be low-carbon steel plates, galvanized steel plates, or high-strength steel plates to obtain higher impact resistance and better structural rigidity.

[0125] Aluminum alloy plates or aluminum-magnesium alloy plates can be used for the aluminum plates to reduce the overall weight of the package while ensuring load-bearing capacity.

[0126] The first base plate section 310 can be made of a single-layer steel plate, a single-layer aluminum plate, or a steel-aluminum composite plate.

[0127] In one possible implementation, the tray 100 includes a tray body 110 and a first beam 120; the tray body 110 forms a receiving cavity; and the first beam 120 is located in the receiving cavity.

[0128] The first beam 120 extends along a first direction intersecting the height of the battery pack; both ends of the first beam 120 are connected to the tray body 110 respectively.

[0129] The battery pack also includes a second beam 500 located in the receiving cavity and extending along a second direction intersecting the height of the battery pack; the second beam 500 is connected to the first beam 120; and there is a gap 510 between the second beam 500 and the battery cell 200.

[0130] The first and second directions intersect. The first direction is referenced... Figure 1 The direction shown is Y. The second direction is referenced. Figure 1 The direction indicated by X in the middle.

[0131] In this application, the first beam 120 and the second beam 500 constitute a cross-support skeleton disposed inside the pallet body 110. The first beam 120 can be understood as a load-bearing beam arranged in one direction along the plane of the pallet 100, and the second beam 500 can be understood as a connecting beam that crosses and cooperates with the first beam 120.

[0132] After the two ends of the first beam 120 are connected to the pallet body 110, the constraint force from the boundary of the pallet 100 can be introduced into the internal support area, thereby reducing the flexural deformation of the pallet body 110 under local pressure, vibration or impact. After the second beam 500 is connected to the first beam 120, it further forms a force flow transmission channel in different directions, so that the load can be distributed to multiple support positions of the pallet body 110 along the cross beams.

[0133] The first direction and the second direction intersect each other, preferably perpendicular to each other. The second beam 500 is connected to the first beam 120, together forming a cross-support skeleton set inside the pallet body 110.

[0134] It should be noted that the second beam 500 is constructed as an overflow beam, that is, when structural adhesive or thermally conductive adhesive is applied between the battery cell 200 and the tray body 110 or between the battery cell 200 and the second beam 500, excess adhesive can be contained and overflowed by specific structures (such as slots, pores or recesses) on the second beam 500, avoiding excessive accumulation of adhesive or overflow into unintended areas.

[0135] In addition, a predetermined gap 510 is maintained between the second beam 500 and the battery cell 200. This gap 510 can accommodate excess adhesive and also serve as a space reserved for the expansion of the battery cell 200, while avoiding rigid contact or interference between the battery cell 200 and the second beam 500.

[0136] In some embodiments, there are multiple second beams 500 to improve the structural strength of the battery pack. Along a first direction, the multiple second beams 500 are spaced apart. Battery cells are located between adjacent second beams 500.

[0137] As one possible implementation, the battery pack also includes a heat-conducting element 600, a portion of which is disposed between the battery cell 200 and the first base plate segment 310.

[0138] A portion of the heat-conducting component 600 is located in the gap 510.

[0139] Along the height direction of the battery pack, the extension length of the second beam 500 is not less than the extension length of the heat-conducting component 600.

[0140] In one possible embodiment, the heat-conducting component 600 is a functional component for transferring heat between the battery cell 200 and the first base plate segment 310. Its function is to establish a heat conduction channel between the heat-generating area of ​​the battery cell 200 and the heat dissipation path of the base plate 300, so that the heat generated by the battery cell 200 during charging and discharging can be diffused more quickly to the first base plate segment 310 and the tray 100 structure connected thereto, thereby reducing local temperature rise and improving the temperature uniformity inside the entire package.

[0141] The heat-conducting component 600 is disposed between the battery cell 200 and the first base plate section 310, and is usually arranged along the bottom or side heat source corresponding area of ​​the battery cell 200. It extends at least partially into the gap 510 formed between the second beam 500 and the battery cell 200, so that the heat conduction path can cross the spatial interruption area formed by the beam and cooperate with the beam structure to dissipate heat.

[0142] A portion of the heat-conducting component 600 is disposed between the battery cell 200 and the first base plate section 310, and is used to conduct the heat generated by the battery cell 200 during operation to the first base plate section 310, and then dissipate heat to the outside through the base plate 300.

[0143] During the assembly process, the heat-conducting component 600 is placed in a liquid state on the upper surface of the first base plate section 310, and then solidified to form a solid heat-conducting component 600.

[0144] Liquid thermally conductive structural adhesive is applied to the upper surface of the first base plate segment 310 in a preset pattern (such as dots, stripes, or covering the entire surface). The amount applied is slightly larger than the amount required by the design to allow for a compensation margin.

[0145] Before the liquid colloid solidifies, the battery cell 200 is placed into the receiving cavity and a predetermined pressure is applied, so that the bottom surface of the battery cell 200 is pressed onto the liquid colloid, and the colloid spreads to the surrounding area under the pressure.

[0146] The squeezed excess liquid thermally conductive structural adhesive flows along the interface between the battery cell 200 and the first base plate segment 310, and enters the gap 510 between the second beam 500 and the battery cell 200. This gap 510 serves as a pre-designed overflow channel, accommodating and restricting the flow range of the excess adhesive.

[0147] The liquid colloid is cured at room temperature or under heating conditions to form a solid thermally conductive component 600. After curing, the portion located between the first base plate section 310 and the battery cell 200 constitutes the main thermal layer, and the portion located within the gap 510 between the second beam 500 and the battery cell 200 constitutes the auxiliary filling portion.

[0148] During the pressing process of cell 200, the liquid thermally conductive structural adhesive will inevitably flow after being squeezed. If a controlled overflow channel is not provided, the excess adhesive may overflow upwards along the side of cell 200, covering the insulating film, tabs, or top cover area of ​​cell 200; or overflow outwards, contaminating the side wall of tray 100, connectors, or sampling harness.

[0149] By setting the gap 510 between the second beam 500 and the battery cell 200 as a preset overflow channel, the liquid adhesive preferentially flows into the gap 510 under pressure.

[0150] Meanwhile, the top height of the second beam 500 is set to be no less than the height of the upper surface of the heat-conducting component 600 after curing, thereby forming a barrier in the height direction to prevent the adhesive from overflowing upwards beyond the top of the second beam 500.

[0151] As one feasible implementation, the thermal conductivity of the heat-conducting element 600 is k, which satisfies: k≥1.5W / (m·K).

[0152] The heat-conducting component 600 is a heat transfer component disposed between the battery cell 200 and the first base plate segment 310. Its thermal conductivity k is used to characterize its ability to conduct the heat generated by the battery cell 200 into the first base plate segment 310 and its connected structure. Under natural cooling conditions, a higher thermal conductivity helps to reduce the temperature difference between the battery cell 200 and the base plate 300 and improve the uniformity of heat diffusion.

[0153] When k≥1.5W / (m·K), the heat-conducting component 600 effectively reduces the temperature drop in the heat transfer path, allowing the heat at the bottom of the battery cell 200 to be quickly dissipated, thus reducing the operating temperature of the battery cell 200. At the same time, it eliminates local hot spots, improves the temperature uniformity of the battery cell 200, and extends the cycle life of the battery cell 200.

[0154] Conversely, when k < 1.5 W / (m·K), heat accumulation leads to an increase in the operating temperature of cell 200 and a decrease in the cycle life of cell 200; the heat diffusion capacity within the plane of the heat-conducting component 600 is insufficient, and local hot spots are easily formed in the concentrated heat area, increasing the risk of thermal runaway.

[0155] Therefore, in this application, the thermal conductivity k of the heat-conducting element 600 satisfies: k≥1.5W / (m·K).

[0156] As one possible implementation, the thermally conductive component 600 includes at least one of thermally conductive gel and thermally conductive structural adhesive.

[0157] The thermally conductive gel is suitable for filling the tiny gap 510 between the battery cell 200 and the first base plate segment 310, and for maintaining compliant contact under assembly errors or thermal expansion and contraction conditions.

[0158] The thermally conductive structural adhesive combines bonding and heat transfer functions, establishing a stable heat conduction channel while fixing the relative positions of the battery cells 200. The heat-conducting components 600 can be distributed locally or continuously along the bottom surface of the battery cells 200, or they can be arranged in point, strip, or surface patterns in multiple contact areas between the battery cells 200 and the first base plate segment 310, to adapt to different battery cell 200 arrangements and base plate 300 structures. Their function is to reduce the thermal resistance between the bottom of the battery cells 200 and the base plate 300, allowing the heat generated by the battery cells 200 during charging and discharging to be transferred more evenly to the first base plate segment 310, and then diffused to the external environment using the larger heat dissipation area of ​​the base plate 300.

[0159] As one possible implementation, the battery pack also includes a first fastener 700, a second fastener 800, and a sealing connector 900.

[0160] The first fastener 700 connects the second beam 500 and the first base plate segment 310. A sealing connector 900 is provided at the connection between the first fastener 700 and the second beam 500 and the base plate segment 300.

[0161] The second fastener 800 connects the first beam 120 and the first base plate segment 310 and the second base plate segment 320; a sealing connector 900 is provided at the connection between the second fastener 800 and the first beam 120 and the base plate 300.

[0162] The base plate 300 and the pallet body 110 are sealed together by a sealing connector 900.

[0163] In one possible embodiment, the first fastener 700 and the second fastener 800 are respectively connecting members used to achieve the fixed assembly of the beam and the base plate 300. The sealing connector 900 is a sealing medium or sealing component arranged at the connection interface, which combines the mechanical connection and sealing function between the beam, the base plate 300 and the pallet body 110, thereby forming a continuous waterproof, dustproof and noise-proof barrier while providing structural fixation, load transfer and assembly positioning.

[0164] The first fastener 700 is located at the corresponding connection position between the second beam 500 and the first base plate section 310. It can be locked by bolts, screws, rivets, rivets or quick-release fasteners. A sealing connector 900 is provided around the hole of the first fastener 700, at the flange mating surface or the pressing surface to compensate for the changes in the gap 510 caused by manufacturing tolerances and thermal expansion and contraction.

[0165] The second fastener 800 is provided in the connection area between the first beam 120 and the first base plate segment 310 and the second base plate segment 320, so that the first beam 120 can form a stable constraint with the base plate 300 at the same time. A sealing connector 900 is provided at the contact interface between the second fastener 800 and the first beam 120 and the base plate 300 to prevent water vapor, dust and road splashes from entering along the fastening channel.

[0166] The base plate 300 and the pallet body 110 are sealed together by a sealing connector 900. The sealing connector 900 can be continuously arranged along the circumference of the pallet 100, or it can form a partially closed sealing path at the splicing edge, folding edge or overlapping edge, so as to maintain a stable sealed contact between the base plate 300 and the pallet body 110.

[0167] In this application, the first fastener 700 can be understood as a mechanical connector used to press or fix the second beam 500 and the first base plate segment 310 together. Its function is to reliably transfer the structural load transmitted from the second beam 500 to the first base plate segment 310 and maintain connection stability under battery pack vibration, impact and thermal cycling conditions. The second fastener 800 can be understood as a composite connector used to simultaneously constrain the first beam 120, the first base plate segment 310 and the second base plate segment 320. Its function is to make the first beam 120 and the two base plate segments 300 form an integrated force relationship, reducing the displacement and warping of the beam relative to the base plate 300.

[0168] In traditional solutions, the base plate 300 undergoes thermal expansion and contraction during welding at high temperatures, resulting in welding deformation (such as warping, wavy deformation, or angular deformation). This affects the flatness of the base plate 300, which in turn affects the installation accuracy of the battery cell 200 and the uniformity of the thickness of the bottom thermal conductive adhesive. The residual welding stress is gradually released during subsequent use, which may cause creep or stress relaxation in the base plate 300, changing the contact state between the battery cell 200 and the base plate 300.

[0169] In this application, the first beam 120, the second beam 500 and the base plate 300, as well as the base plate 300 and the pallet body 110 are fixed by a combination of mechanical connection and sealing, rather than the welding connection in the traditional solution.

[0170] Since there is no need to heat the base plate 300 at high temperatures, it maintains its original flatness throughout the assembly process. There is no welding heat affecting the connection between the first base plate segment 310 and the second base plate segment 320, or between the base plate 300 and the tray body 110, thus avoiding warping, wavy deformation, or localized unevenness caused by welding in traditional solutions. This provides a good foundation for the stable placement of the battery cell 200 and the uniform application of the thermally conductive adhesive.

[0171] The fastener connection is a mechanical cold connection, which does not introduce residual thermal stress. During battery pack use, even under temperature cycling or vibration loads, the sealing connector 900 at the connection interface can absorb part of the relative displacement through elastic deformation, without causing stress accumulation or creep deformation as in welded structures. The dimensional stability of the base plate 300 is significantly improved.

[0172] In some embodiments, the first fastener 700 is an M5 large flange rivet nut. The second fastener 800 is a bolt.

[0173] Among them, the M5 large flange rivet nut is a fastener designed specifically for thin plate or thin-walled workpieces. It provides a stable and reliable connection by riveting from one side to form a strong bearing surface on the back of the workpiece.

[0174] Secondly, embodiments of this application provide a vehicle including the aforementioned battery pack.

[0175] In this embodiment, after the vehicle is equipped with the above-mentioned battery pack, the tray 100, the double bottom plate 300 section and the installation area buffer 400 of the battery pack can be used to form a stable bottom support and protection system, so that when the battery pack is installed as a power energy unit in vehicles and other equipment, it can better adapt to road impact, vibration and long-term load.

[0176] Because the battery pack itself takes into account the requirements of load bearing, buffering and heat transfer, the vehicle can still maintain good cell 200 installation stability and heat dissipation capability under natural cooling conditions, thereby reducing the adverse effects of impact on the internal cells 200 after the bottom is impacted. Therefore, it helps to improve the overall reliability, safety and continuous working performance under complex conditions.

[0177] Specifically, in the battery pack manufacturing process, the tray body 110 and the first beam 120 are first welded together; then, a polyvinyl chloride (PVC) anti-stone-impact coating is sprayed onto the surface of the second base plate section 320, and after completion, it is put into storage for assembly.

[0178] Then, an insulating and anti-corrosion coating is applied to the surface of the first base plate section 310 by phosphating / spraying, and structural sealant is applied to the outer ring and overlap of the first base plate section 310 to form an external seal. M5 large flange rivet nuts are installed around the perimeter and at key connection positions.

[0179] Subsequently, thermally conductive structural adhesive was applied to the second beam 500 and the first base plate section 310, and the adhesive thickness was controlled; the battery cell 200 was then placed, pressed, and cured according to the curing specifications.

[0180] Subsequently, intermediate support foam is arranged between the first base plate section 310 and the second base plate section 320.

[0181] Finally, align the second base plate section 320 with the above structure and tighten it around the perimeter with bolts / M5 rivet nuts to form a closed loop of sealing and force path; complete the leak detection, flatness and NVH tests.

[0182] NVH testing is a comprehensive testing system specifically designed to evaluate the combined performance of a vehicle or other mechanical equipment during driving or operation, including noise, vibration, and harshness. Its core objective is to ensure driving comfort and product quality.

[0183] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A battery pack, characterized in that, include: A tray (100) having a receiving cavity; A battery cell (200) is located in the receiving cavity; A base plate (300) is disposed at the bottom of the tray (100); the base plate (300) includes a first base plate segment (310) and a second base plate segment (320); the first base plate segment (310) and the second base plate segment (320) are disposed opposite to each other along the height direction of the battery pack; the first base plate segment (310) is disposed close to the receiving cavity relative to the second base plate segment (320); the battery cell (200) is disposed on the surface of the first base plate segment (310); an installation area is formed between the first base plate segment (310) and the second base plate segment (320); A buffer (400) is located in the mounting area.

2. The battery pack according to claim 1, characterized in that, The second base plate segment (320) has an elastic layer on its surface opposite to the first base plate segment (310).

3. The battery pack according to claim 2, characterized in that, The second base plate segment (320) is provided with a plurality of recesses; the recesses are recessed inward relative to the second base plate segment (320) toward the side closer to the first base plate segment (310); The multiple recesses are arranged in an array on the second base plate segment (320).

4. The battery pack according to claim 2, characterized in that, An insulating layer is provided on the surface of the first base plate segment (310); And / or, the surface of the first base plate segment (310) is provided with an anti-corrosion layer.

5. The battery pack according to any one of claims 2-4, characterized in that, The tray (100) includes a tray body (110) and a first beam (120); the tray body (110) forms the receiving cavity; the first beam (120) is located in the receiving cavity; The first beam (120) extends along a first direction intersecting the height of the battery pack; both ends of the first beam (120) are respectively connected to the tray body (110); The battery pack further includes a second beam (500) located in the receiving cavity, the second beam (500) extending along a second direction intersecting the height of the battery pack; the second beam (500) is connected to the first beam (120); a gap (510) exists between the second beam (500) and the battery cell (200). The first direction and the second direction intersect.

6. The battery pack according to claim 5, characterized in that, It also includes a heat-conducting component (600), a portion of which is disposed between the battery cell (200) and the first base plate segment (310); A portion of the heat-conducting element (600) is located in the gap (510); Along the height direction of the battery pack, the extension length of the second beam (500) is not less than the extension length of the heat-conducting element (600).

7. The battery pack according to claim 5, characterized in that, It also includes a first fastener (700), a second fastener (800), and a sealing connector (900); The first fastener (700) connects the second beam (500) and the first base plate segment (310), and the sealing connector (900) is provided at the connection between the first fastener (700) and the second beam (500) and the base plate (300) segment. The second fastener (800) connects the first beam (120) and the first bottom plate segment (310) and the second bottom plate segment (320); the sealing connector (900) is provided at the connection between the second fastener (800) and the first beam (120) and the bottom plate (300). The base plate (300) and the pallet body (110) are sealed together by the sealing connector (900).

8. The battery pack according to claim 6, characterized in that, The thickness of the first base plate segment (310) is W, wherein W satisfies: 0.8mm≤W≤2.0mm; And / or, the thermal conductivity of the heat-conducting element (600) is k, which satisfies: k≥1.5W / (m·K).

9. The battery pack according to claim 6, characterized in that, At least one of the following conditions must be met: The first base plate segment (310) includes at least one of steel plate and aluminum plate; The elastic layer includes at least one of polyvinyl chloride anti-stone chip coating, polyurethane elastomer coating, and polyurea elastomer coating; The thermally conductive component (600) includes at least one of thermally conductive gel and thermally conductive structural adhesive; The buffer (400) includes at least one of foam, foamed rubber, and elastomer gasket.

10. A vehicle, characterized in that, The battery pack includes any one of claims 1-9.

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