Floor assembly of vehicle, lower vehicle body and vehicle

Abstract

The utility model discloses a floor assembly of a vehicle, a lower vehicle body and the vehicle, the floor assembly comprises a floor, a battery pack and a cross beam, the battery pack comprises a plurality of single batteries which are sequentially arranged in the first direction, each single battery is directly and fixedly connected to the thickness side of the floor, and the cross beam extends in the second direction and is used for installing a seat of the vehicle; the cross beam comprises at least one first connecting part, the first connecting part is directly and fixedly connected to the other side of the thickness of the floor, in the first direction, the first connecting part spans a gap between two adjacent battery monomers of the battery pack, and the size of the first connecting part in the first direction is smaller than that of the two adjacent battery monomers in the first direction. According to the floor assembly, the utilization rate of the mounting space of the battery monomers can be increased, the stress concentration of the battery monomers at the mounting position can be improved, and the floor assembly has good use reliability.

Description

Technical Field

[0001] The present application relates to the technical field of vehicles, and in particular to a floor assembly, an undercarriage and a vehicle of a vehicle. Background Art

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, batteries, as the power source of electric vehicles, play an irreplaceable and important role. However, the battery installation method has a low utilization rate of the space provided for installing batteries in the vehicle, and will affect the performance of the battery to a certain extent. Utility Model Content

[0003] The present application proposes a vehicle floor assembly, an undercarriage and a vehicle. The floor assembly can improve the utilization rate of the installation space of the battery cells and can improve the stress concentration of the battery cells at the installation position, and has good reliability in use.

[0004] In a first aspect, an embodiment of the present application proposes a floor assembly of a vehicle, comprising: a floor; a battery pack, the battery pack comprising a plurality of battery cells arranged in sequence along a first direction, each battery cell being directly fixedly connected to one side of the thickness of the floor; a crossbeam, the crossbeam extending along a second direction and being used to mount a seat of the vehicle, the crossbeam comprising at least one first connection portion, the first connection portion being directly fixedly connected to the other side of the thickness of the floor, in the first direction, the first connection portion spans a gap between two adjacent battery cells of the battery pack, and a dimension of the first connection portion in the first direction is smaller than a dimension of two adjacent battery cells in the first direction, the second direction intersects with the first direction, and the second direction and the first direction are respectively perpendicular to the thickness direction of the floor

[0005] In the above technical solution, by setting the first connecting portion of the crossbeam to span the gap between two adjacent battery cells of the battery pack in the first direction, and the size of the first connecting portion in the first direction is smaller than the size of the two adjacent battery cells in the first direction, a part of the first connecting portion is opposite to one of the two adjacent battery cells in the floor thickness direction, and another part of the first connecting portion is opposite to the other of the two adjacent battery cells in the floor thickness direction. Under the action of external force, it is convenient to realize that the corresponding two adjacent battery cells share the stress through the first connecting portion, so as to improve the stress concentration of the battery cell at the position corresponding to the first connecting portion, which is beneficial to improving the material utilization rate and the reliability of the floor assembly.

[0006] In some embodiments, the battery cell is bonded and fixed to the floor; and / or the first connection portion is spot-welded and fixed to the floor.

[0007] In the above technical solution, it is easy to realize reliable connection between the battery cell and the floor, and to realize reliable connection between the first connecting part and the floor.

[0008] In some embodiments, the beam includes a plurality of first connection portions spaced apart along the first direction, the first connection portion is located at one end of the beam in the first direction, or the first connection portion and both ends of the beam in the first direction are spaced apart respectively.

[0009] In the above technical solution, by setting the crossbeam to include multiple first connecting parts, it is convenient to improve the stress concentration of more battery cells through a single crossbeam, facilitate effective utilization of the crossbeam, and help save materials and reduce costs to a certain extent.

[0010] In some embodiments, the two ends of the beam in the first direction respectively have a first connection portion, the two first connection portions respectively correspond to the two ends of one of the battery cells of the battery pack in the first direction, and the portion of the beam located between the two first connection portions protrudes in the direction away from the battery pack so that the beam and the floor define a first cavity between the two first connection portions.

[0011] In the above technical solution, by arranging the first connecting parts at both ends of the crossbeam in the first direction, it is convenient to use less material to achieve reliable arrangement of the crossbeam and to improve the stress distribution of the battery cell corresponding to the crossbeam which is prone to stress concentration.

[0012] In some embodiments, the cross beam further includes a second connection portion, which is spaced apart from the first connection portion along the first direction, and the second connection portion is directly fixedly connected to the other side of the thickness of the floor, and in the first direction, the second connection portion corresponds to a battery cell of the battery pack.

[0013] In the above technical solution, by setting a second connection part spaced apart from the first connection part along the first direction, the second connection part is also directly fixedly connected to the floor. In the first direction, the second connection part corresponds to a battery cell of the battery pack, so that the gap between the second connection part and two adjacent battery cells is staggered in the first direction, which is beneficial to improving the reliability of the crossbeam installation.

[0014] In some embodiments, a portion of the cross beam located between the first connection portion and the second connection portion protrudes in a direction away from the battery pack, so that the cross beam and the floor define a second cavity between the first connection portion and the second connection portion.

[0015] In the above technical solution, by setting the portion of the cross beam located between the first connection part and the second connection part to protrude in the direction away from the battery pack, the cross beam and the floor define a second cavity between the first connection part and the second connection part, which is convenient for simplifying the structure of the cross beam while meeting the strength, rigidity and installation requirements, and is beneficial to reducing the overall weight of the floor assembly and saving costs; when the cross beam is subjected to a certain impact force, the cross beam can be deformed based on itself to absorb part of the impact force, which is beneficial to reducing the impact force transmitted to the floor, reducing the influence of the impact force on the floor, and reducing the risk of the floor squeezing the battery cells.

[0016] In some embodiments, the two ends of the beam in the first direction respectively have first connection parts, the two first connection parts respectively correspond to the two ends of one of the battery cells in the battery pack in the first direction, and the second connection part is located between the two first connection parts and corresponds to one of the battery cells.

[0017] In the above technical solution, by providing a second connection portion between the two first connection portions, it is beneficial to improve the structural strength and installation reliability of the beam itself.

[0018] In some embodiments, the first connection portion extends along the second direction, there are multiple battery groups and the battery groups are arranged sequentially along the second direction, and in the first direction, the first connection portion spans a gap between two adjacent battery cells in each battery group.

[0019] In the above technical solution, the first connecting portion is arranged to span the gap between two adjacent battery cells of each battery group in the first direction so that the force applied by the first connecting portion to more battery cells can be improved accordingly, thereby reducing the stress concentration of the battery cell shell, which is beneficial to improving the overall reliability of the floor assembly.

[0020] In a second aspect, an embodiment of the present application proposes an undercarriage, comprising a frame and the above-mentioned floor assembly, wherein the frame is fixed to the floor and defines a receiving cavity with the floor on one side of the thickness of the floor, and a battery pack is disposed in the receiving cavity.

[0021] In the above technical solution, since the lower vehicle body adopts the above floor assembly, the stress concentration of the shell of the battery cell can be improved, which is beneficial to improving the reliability of the lower vehicle body.

[0022] In a third aspect, an embodiment of the present application provides a vehicle, comprising the above-mentioned floor assembly or the above-mentioned underbody.

[0023] In the above technical solution, since the vehicle adopts the above-mentioned floor assembly or lower body, it is beneficial to improve the reliability of vehicle use and can realize the integrated assembly of battery cells and the lower body. The battery cells can be directly installed on the floor of the lower body, which is beneficial to reduce the number of parts of the vehicle, thereby better saving costs and assembly time.

[0024] In some embodiments, a vehicle includes a lower vehicle body according to the claims, and further includes an upper vehicle body, the upper vehicle body being detachably connected to the lower vehicle body.

[0025] In the above technical solution, by detachably connecting the upper body to the lower body, the lower body has a high degree of integration, which can reduce R&D costs and shorten the R&D cycle; the upper body can be replaced according to demand, in other words, the lower body can be adapted to a variety of vehicle models. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0027] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0028] Figure 2 An exploded diagram of a battery structure provided by a battery cell according to some embodiments of the present application;

[0029] Figure 3 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0030] Figure 4 A schematic diagram of the structure of a floor assembly provided in some embodiments of the present application;

[0031] Figure 5 For along Figure 4 Sectional view along line AA;

[0032] Figure 6 It is a structural schematic diagram of Scheme 1 and Scheme 2;

[0033] Figure 7 It is the stress distribution diagram of the battery cell under random vibration in scheme 1;

[0034] Figure 8 This is the stress distribution diagram of the battery cell in Scheme 2 under random vibration.

[0035] Reference numerals:

[0036] Vehicle 1000, floor assembly 100, battery 200, box 101, controller 300, motor 400,

[0037] The floor 1 , the battery pack 2 , the battery cell 21 , the cross beam 3 , the second cavity 3 a , the first cavity 3 b , the first connecting portion 31 , the second connecting portion 32 , and the adhesive member 4 . DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0040] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0041] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0042] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0043] The term "plurality" used in the present application refers to two or more (including two).

[0044] In the present application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., and the embodiments of the present application do not limit this. Battery cells may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application do not limit this.

[0045] The battery mentioned in the embodiments of the present application refers to a single physical module including multiple battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may be a battery pack or a battery package. A battery pack generally includes multiple battery cells. The battery generally includes a box for encapsulating multiple battery cells or multiple battery modules, and the box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells; of course, the battery may not include a box.

[0046] Exemplarily, a battery cell may generally include a shell, a battery cell assembly and an electrolyte, wherein the shell is used to contain the battery cell assembly and the electrolyte, and the shell is provided with at least one positive electrode column and at least one negative electrode column. The battery cell assembly includes one or more electrode assemblies, and the electrode assembly is formed by stacking or winding a positive electrode sheet, a negative electrode sheet and a separator. Optionally, the shell is an aluminum shell, but is not limited thereto.

[0047] Among them, the positive electrode sheet can generally include a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is directly or indirectly coated on the positive electrode current collector, the positive electrode current collector not coated with the positive electrode active material layer protrudes from the positive electrode current collector coated with the positive electrode active material layer, the positive electrode current collector not coated with the positive electrode active material layer serves as a positive electrode tab sheet, and a plurality of positive electrode tab sheets are stacked together and electrically connected to the positive electrode column. Exemplarily, the plurality of stacked positive electrode tab sheets can be directly welded to the positive electrode column to form an electrical connection; or, the battery cell assembly can also include a positive electrode adapter sheet, the plurality of stacked positive electrode tab sheets are welded to one end of the positive electrode adapter sheet, and the other end of the positive electrode adapter sheet is welded to the positive electrode column, so that the positive electrode tab sheet is electrically connected to the positive electrode column.

[0048] The negative electrode sheet can generally include a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is directly or indirectly coated on the negative electrode current collector, the negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer, the negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab sheet, and a plurality of negative electrode tab sheets are stacked together and electrically connected to the negative electrode column. Exemplarily, a plurality of negative electrode tab sheets stacked together can be directly welded to the negative electrode column to form an electrical connection; or, the battery cell assembly can also include a negative electrode adapter sheet, a plurality of negative electrode tab sheets stacked together are welded to one end of the negative electrode adapter sheet, and the other end of the negative electrode adapter sheet is welded to the negative electrode column, so that the negative electrode tab sheet is electrically connected to the negative electrode column. The material of the separator is not limited, for example, it can be polypropylene or polyethylene.

[0049] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, batteries, as the power source of electric vehicles, play an irreplaceable and important role.

[0050] For the existing models on the market, the traditional CTB scheme body and battery pack are designed and developed independently. There is no interactive interface between the arrangement of the battery cells inside the battery pack and the body, so it is difficult to find a suitable relative position between the battery cell and the body seat crossbeam. In some technologies, when the battery cell is applied to the body, it is necessary to first install the battery cell into a battery box to form a sealed battery pack, and then install the battery pack on the floor. The battery box and the floor are independent entities, and there is a redundant structure between the two entities, which is not conducive to lightweight and reduces the overall space utilization of the lower body.

[0051] Based on the above considerations, a floor assembly of a vehicle is proposed, the floor assembly includes a floor, a battery pack and a cross beam, the battery pack includes a plurality of battery cells arranged in sequence along a first direction, each battery cell is directly fixedly connected to one side of the thickness of the floor, the cross beam extends along a second direction and is used to install a seat of the vehicle, the cross beam includes at least one first connection portion, the first connection portion is directly fixedly connected to the other side of the thickness of the floor, in the first direction, the first connection portion spans the gap between two adjacent battery cells of the battery pack, and the size of the first connection portion in the first direction is smaller than the size of the two adjacent battery cells in the first direction.

[0052] In the above technical solution, the battery cells are directly installed on the floor so as to realize the integrated assembly of the floor and the battery cells, so that at least part of the floor is constructed as a part of the battery box, saving the use of the battery box, so that the floor can integrate the upper box function and the floor function of the battery. When the floor assembly is applied to the lower vehicle body, it can not only play a certain protective role for the battery cells, but also meet the assembly needs of parts such as wiring harnesses and seats, which is conducive to reducing the number of parts of the lower vehicle body, thereby better saving costs and assembly time, and can also improve the utilization rate of the lower vehicle body power distribution space, which is conducive to the miniaturization and lightweight of the lower vehicle body; and by setting the first connecting portion of the cross beam at The first connection portion spans a gap between two adjacent battery cells of the battery pack in the first direction, and the size of the first connection portion in the first direction is smaller than the size of the two adjacent battery cells in the first direction, so that a portion of the first connection portion is opposite to one of the two adjacent battery cells in the direction of floor thickness, and another portion of the first connection portion is opposite to the other of the two adjacent battery cells in the direction of floor thickness. Under the action of external force, the first connection portion is convenient for the corresponding two adjacent battery cells to share stress together, so as to improve the stress concentration of the battery cell at the position corresponding to the first connection portion, which is beneficial to improving the material utilization rate and reliability of the floor assembly.

[0053] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. The vehicle 1000 is provided with a battery 200, and the battery 200 may be arranged at the bottom, head or tail of the vehicle 1000. The battery 200 may be used to power the vehicle 1000, for example, the battery 200 may be used as an operating power source for the vehicle. The vehicle 1000 may also include a controller 300 and a motor 400, and the controller 300 is used to control the battery 200 to power the motor 400, for example, for the starting, navigation and driving power requirements of the vehicle 1000. In some embodiments of the present application, the battery 200 may be used not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0054] Please refer to Figure 2 , Figure 2The battery cells 21 provided in some embodiments of the present application are used in the structural explosion diagram of the battery 200. The battery 200 includes a case 101 and a plurality of battery cells 21, and the battery cells 21 are accommodated in the case 101. Among them, the case 101 is used to provide an assembly space for the battery cells 21, and the case 101 can adopt a variety of structures. In some embodiments, the case 101 may include a first case 101a and a second case 101b, and the first case 101a and the second case 101b cover each other, and the first case 101a and the second case 101b jointly define a receiving cavity for accommodating the battery cells. The second case 101b may be a hollow structure with one end open, and the first case 101a may be a plate-like structure, and the first case 101a covers the open side of the second case 101b, so that the first case 101a and the second case 101b jointly define a receiving cavity; or, the first case 101a and the second case 101b may also be hollow structures with one side open (for example Figure 2 As shown in FIG. 1 , the open side of the first box body 101a covers the open side of the second box body 101b. Of course, the box body 101 formed by the first box body 101a and the second box body 101b can be in various shapes, such as a cylinder or a cuboid.

[0055] Optionally, at least a portion of the floor panel 1 is configured as a first box 101 a .

[0056] In the battery 200, multiple battery cells 21 can be connected in series, in parallel or in a mixed connection. A mixed connection means that multiple battery cells 21 are connected in series and in parallel. Multiple battery cells 21 can be directly connected in series, in parallel or in a mixed connection, and then the whole formed by multiple battery cells 21 is accommodated in the box 101; or, the battery 200 can also be a battery pack 2 in the form of multiple battery cells 21 connected in series, in parallel or in a mixed connection, and then multiple battery packs 2 are connected in series, in parallel or in a mixed connection to form a whole, and accommodated in the box 101. The battery 200 may also include other structures, for example, the battery 200 may also include a busbar for realizing electrical connection between multiple battery cells 21.

[0057] Please refer to Figure 3 , Figure 3 The schematic diagram of the structure of the battery cell 21 provided in some embodiments of the present application. The battery cell is a rectangular parallelepiped, and the height direction of the battery cell 21 is the up-down direction, the length direction of the battery cell 21 is the first direction BB', and the thickness direction of the battery cell 21 is the second direction CC'. The first direction, the second direction and the up-down direction are perpendicular to each other; but not limited to this, in other embodiments of the present application, the battery cell 21 can also be a polygonal prism, a flat body or other shapes.

[0058] Please refer to Figure 4 and Figure 5 , Figure 4This is a schematic diagram of the structure of a floor assembly 100 provided in some embodiments of the present application. Figure 5 For along Figure 4 In the cross-sectional view taken along line AA, in the embodiment of the present application, a floor assembly 100 of a vehicle 1000 includes a floor 1 , a battery pack 2 , and a cross beam 3 .

[0059] The battery pack 2 includes a plurality of battery cells 21 arranged in sequence along a first direction, each battery cell 21 is directly fixedly connected to one side of the thickness of the floor 1, the cross beam 3 extends along a second direction, and the cross beam 3 is used to install the seat of the vehicle 1000, and the cross beam 3 includes at least one first connection portion 31, and the first connection portion 31 is directly fixedly connected to the other side of the thickness of the floor 1; the second direction intersects with the first direction, and the second direction and the first direction are respectively perpendicular to the thickness direction of the floor 1. It can be seen that the battery pack 2 and the cross beam 3 are respectively arranged on both sides of the thickness of the floor 1.

[0060] The floor 1 is the main component of the floor assembly 100 and also serves as the main load-bearing component. The floor 1 can have a variety of shapes, regular shapes such as a cuboid, a cube, a trapezoid, etc., or other irregular shapes. The shape of the floor 1 should not affect the installation of the battery cell 21. When the floor assembly 100 is applied to the lower vehicle body, the floor assembly 100 can cover the opening of the frame. In an embodiment of the present application, the floor 1 can also be made of a variety of materials, such as steel, aluminum alloy, or other composite materials, etc. Optionally, one material is a carbon fiber composite material, which has the advantages of light weight, high strength, and strong impact resistance.

[0061] The cross beam 3 is formed as a seat mounting cross beam, and the cross beam 3 is a component connecting the floor 1 to the seat, and its material can be aluminum alloy, carbon steel, stainless steel, etc.

[0062] It can be seen that in the above scheme of the present application, the battery cell 21 is directly installed on the floor 1 so as to realize the integrated assembly of the floor 1 and the battery cell 21, so that at least part of the floor 1 is constructed as a part of the battery box, saving the use of the battery box, so that the floor 1 can integrate the upper box function and the floor function of the battery. When the floor assembly 100 is applied to the lower vehicle body, it can not only play a certain protective role for the battery cell 21, but also meet the assembly needs of parts such as wiring harnesses and seats, which is conducive to reducing the number of parts of the lower vehicle body, thereby better saving costs and assembly time, and can also improve the utilization rate of the lower vehicle body power distribution space, which is conducive to the miniaturization and lightweight of the lower vehicle body.

[0063] Among them, in the first direction, the first connecting portion 31 spans the gap between two adjacent battery cells 21 of the battery pack 2, and the dimension L1 of the first connecting portion 31 in the first direction is smaller than the dimension L2 of the two adjacent battery cells 21 in the first direction, and the dimension L1 of the first connecting portion 31 in the first direction is larger than the gap between the two adjacent battery cells 21. It can be seen that a part of the first connecting portion 31 is opposite to one of the two adjacent battery cells 21 along the thickness direction of the floor 1, and another part of the first connecting portion 31 is opposite to the other of the two adjacent battery cells 21 along the thickness direction of the floor 1. In other words, along the thickness direction of the floor 1, the projection of the first connecting portion 31 partially overlaps with the projection of the two adjacent battery cells 21, respectively, and the first connecting portion 31 is fixed to the floor 1. Under the action of external force (such as up and down vibration, random vibration, etc.), it is convenient to realize that the corresponding two adjacent battery cells 21 share stress together through the first connecting portion 31, so as to improve the stress concentration of the battery cell 21 at the position corresponding to the first connecting portion 31.

[0064] It is understandable that in some technologies, the battery cells are fixed to the lower box, and an upper box is separately provided between the battery cells and the floor so that the battery cells are accommodated between the upper box and the lower box, and adjacent battery cells are connected and fixed. At the same time, there is a certain gap between the battery cells and the floor. At this time, under the action of external force, there is stress between adjacent battery cells, and it is easy to cause stress concentration in the shell of the battery cell, resulting in excessive stress in the shell of the battery cell; and in the above-mentioned arrangement of the present application, the two adjacent battery cells 21 can share stress with each other through the first connecting portion 31 at the position opposite to the first connecting portion 31, so as to improve the stress concentration of each of the above-mentioned two adjacent battery cells 21, which is beneficial to reduce the stress of the shell of the battery cell 21, thereby improving the reliability of the floor assembly 100 to a certain extent.

[0065] In the above technical solution, by arranging the first connection portion 31 of the cross beam 3 to span the gap between two adjacent battery cells 21 of the battery pack 2 in the first direction, and the size of the first connection portion 31 in the first direction is smaller than the size of the two adjacent battery cells 21 in the first direction, a part of the first connection portion 31 is opposite to one of the two adjacent battery cells 21 along the thickness direction of the floor 1, and another part of the first connection portion 31 is opposite to the other of the two adjacent battery cells 21 along the thickness direction of the floor 1. Under the action of external force, it is convenient to realize that the corresponding two adjacent battery cells 21 share the stress through the first connection portion 31, so as to improve the stress concentration of the battery cell 21 at the position corresponding to the first connection portion 31, which is beneficial to improving the material utilization rate and the reliability of the floor assembly 100, and at the same time, it is beneficial for the battery cell 21 to give full play to its performance.

[0066] It can be understood that, in the embodiment of the present application, the number of the beams 3 can be one or more; when there are multiple beams 3, the multiple beams 3 can be arranged at intervals along the first direction.

[0067] In some embodiments, please refer to Figure 5 The battery cell 21 is bonded and fixed to the floor 1, and the battery cell 21 and the floor 1 are bonded and fixed by the adhesive 4, which is convenient for realizing a reliable connection between the battery cell 21 and the floor 1; and / or, the first connecting portion 31 is spot-welded and fixed to the floor 1, which is convenient for improving the installation convenience and efficiency of the crossbeam 3 while realizing a reliable connection between the first connecting portion 31 and the floor 1.

[0068] Of course, the connection method between the battery cell 21 and the floor 1 is not limited to this, for example, the battery cell 21 and the floor 1 are welded, clamped, riveted, or threaded; similarly, the connection method between the first connection part 31 and the floor 1 is not limited to this, for example, the first connection part 31 and the floor 1 are riveted or threaded, and the first connection part 31 and the floor 1 can be detachably connected or non-detachably connected.

[0069] Exemplarily, the pole of the battery cell 21 is located on the side of the battery cell 21 facing away from the floor 1 , so as to realize the inverted arrangement of the battery cell 21 , which is convenient for fixing the battery cell 21 to the floor 1 .

[0070] In some embodiments, please refer to Figure 5 The crossbeam 3 includes a plurality of first connection portions 31 spaced apart along the first direction, which is conducive to improving the stress concentration problem of the plurality of battery cells 21 at the positions corresponding to the first connection portions 31. It can be understood that, as shown in the figure, two adjacent first connection portions 31 can correspond to three adjacent battery cells 21 of the battery pack 2; or, one of the two adjacent first connection portions 31 corresponds to two adjacent battery cells 21 of the battery pack 2 (hereinafter referred to as battery cells a), and the other corresponds to two adjacent battery cells 21 of the battery pack 2 (hereinafter referred to as battery cells b), and the battery cells a and the battery cells b can be arranged adjacently, that is, no other battery cells 21 are arranged between the two, or at least one other battery cell 21 is arranged between the battery cells a and the battery cells b.

[0071] Among them, for a single first connection part 31, the first connection part 31 is located at one end of the beam 3 in the first direction, or the first connection part 31 and the two ends of the beam 3 in the first direction are respectively spaced apart, then the setting position of the first connection part 31 has a certain flexibility, which is convenient for adapting to different actual scenarios.

[0072] In the above technical solution, by setting the crossbeam 3 to include multiple first connecting parts 31, it is convenient to improve the stress concentration of more battery cells 21 through a single crossbeam 3, and it is convenient to achieve effective utilization of the crossbeam 3, which is beneficial to saving materials and reducing costs to a certain extent.

[0073] It can be understood that when the first connection portion 31 is located at one end of the crossbeam 3 in the first direction, the first connection portion 31 can be formed as a flange at the end of the crossbeam 3 .

[0074] In some embodiments, please refer to Figure 5 The two ends of the crossbeam 3 in the first direction respectively have first connecting parts 31, and the two first connecting parts 31 respectively correspond to the two ends of one of the battery cells 21 (hereinafter referred to as battery cell P1) of the battery group 2 in the first direction. At this time, the crossbeam 3 and the battery cell P1 are arranged relative to each other in the thickness direction of the floor 1, and one of the first connecting parts 31 spans the gap between the battery cell P1 and the battery cell P2 which belongs to the same battery group 2 and is adjacent to it, and the size of the first connecting part 31 in the first direction is smaller than the size occupied by the battery cell P1 and the battery cell P2 in the first direction, and the other first connecting part 31 spans the gap between the battery cell P1 and the battery cell P3 which belongs to the same battery group 2 and is adjacent to it, and the size of the first connecting part 31 in the first direction is smaller than the size occupied by the battery cell P1 and the battery cell P3 in the first direction; wherein the battery cell P2 and the battery cell P3 are respectively arranged on both sides of the battery cell P1 in the first direction.

[0075] The portion of the cross beam 3 located between the two first connection portions 31 protrudes in a direction away from the battery pack 2 , so that the cross beam 3 and the floor 1 define a first cavity 3 b between the two first connection portions 31 .

[0076] In the above technical solution, by arranging the cross beam 3 to have the first connecting parts 31 at both ends in the first direction, it is convenient to use less material to realize the reliable arrangement of the cross beam 3, and it is convenient to realize the improvement of the stress distribution of the battery cell 21 corresponding to the cross beam 3 which is prone to stress concentration; in addition, it is convenient to meet the strength and rigidity requirements, and the structure of the cross beam 3 can be simplified, which is beneficial to reduce the overall weight of the floor assembly 100. When the cross beam 3 is subjected to a certain impact force, the cross beam 3 can be deformed based on itself to absorb part of the impact force, which is beneficial to reduce the impact force transmitted to the floor 1, reduce the influence of the impact force on the floor 1, and help reduce the risk of the floor 1 squeezing the battery cell 21.

[0077] Exemplarily, as shown in the figure, the size of the crossbeam 3 in the first direction is substantially consistent with the size of one of the battery cells 21 in the first direction, and the difference is not large, which is beneficial to further reduce the material consumption of the crossbeam 3 .

[0078] In some embodiments, please refer to Figure 5 The cross beam 3 also includes a second connection portion 32, which is spaced apart from the first connection portion 31 along the first direction, and is directly fixedly connected to the other side of the thickness of the floor 1, that is, the first connection portion 31 and the second connection portion 32 are located on the same side of the thickness of the floor 1. In the first direction, the second connection portion 32 corresponds to a battery cell 21 of the battery pack 2, and along the thickness direction of the floor 1, the projection of the second connection portion 32 in the first direction does not extend out of the two ends of the projection of the corresponding battery cell 21 in the first direction.

[0079] In the above technical solution, by setting a second connection part 32 spaced apart from the first connection part 31 along the first direction, the second connection part 32 is also directly fixedly connected to the floor 1. In the first direction, the second connection part 32 corresponds to a battery cell 21 of the battery pack 2, so that the gap between the second connection part 32 and two adjacent battery cells 21 is staggered in the first direction, which is beneficial to improving the installation reliability of the crossbeam 3.

[0080] In some embodiments, please refer to Figure 5 The portion of the cross beam 3 located between the first connection portion 31 and the second connection portion 32 protrudes in a direction away from the battery pack 2, so that the cross beam 3 and the floor 1 define a second cavity 3a between the first connection portion 31 and the second connection portion 32, and the portion of the cross beam 3 corresponding to the portion between the first connection portion 31 and the second connection portion 32 can be formed into a hollow structure.

[0081] In the above technical solution, the portion of the cross beam 3 located between the first connection portion 31 and the second connection portion 32 is arranged to protrude in the direction away from the battery pack 2, so that the cross beam 3 and the floor 1 define a second cavity 3a between the first connection portion 31 and the second connection portion 32, which is convenient for simplifying the structure of the cross beam 3 while meeting the strength, rigidity and installation requirements, and is beneficial to reducing the overall weight of the floor assembly 100 and saving costs; when the cross beam 3 is subjected to a certain impact force, the cross beam 3 can be deformed based on itself to absorb part of the impact force, which is beneficial to reducing the impact force transmitted to the floor 1, reducing the influence of the impact force on the floor 1, and reducing the risk of the floor 1 squeezing the battery cell 21.

[0082] For example, Figure 5 As shown, the two ends of the beam 3 in the first direction respectively have a first connection portion 31, a second connection portion 32 is disposed between the two first connection portions 31, and a second cavity 3a is formed between each of the two first connection portions 31 and the second connection portion 32. Thus, the cross-sectional shape of the beam 3 is substantially M-shaped.

[0083] Of course, in other embodiments of the present application, the beam 3 may not include the second connecting portion 32 .

[0084] In some embodiments, please refer to Figure 5 The beam 3 has first connecting portions 31 at both ends in the first direction, and the two first connecting portions 31 correspond to the two ends of one of the battery cells 21 of the battery pack 2 in the first direction, respectively. The second connecting portion 32 is located between the two first connecting portions 31 and corresponds to one of the battery cells 21.

[0085] In the above technical solution, by providing the second connection part 32 between the two first connection parts 31 , it is beneficial to improve the structural strength and installation reliability of the beam 3 itself.

[0086] In some embodiments, please refer to Figure 8 The first connecting portion 31 extends along the second direction. There are multiple battery packs 2 and the multiple battery packs 2 are arranged in sequence along the second direction. In the first direction, the first connecting portion 31 spans the gap between two adjacent battery cells 21 of each battery pack 2. The first connecting portion 31 can improve the force applied to two adjacent battery cells 21 of each battery pack 2.

[0087] In the above technical solution, the first connecting portion 31 is arranged to span the gap between two adjacent battery cells 21 of each battery group 2 in the first direction, so that the force applied by the first connecting portion 31 to more battery cells 21 can be improved accordingly, thereby reducing the stress concentration of the shell of the battery cell 21, which is beneficial to improving the overall reliability of the floor assembly 100.

[0088] For example, Figure 8 As shown, the second direction is perpendicular to the first direction, and the size of the first connecting portion 31 in the second direction is greater than or equal to the size of the plurality of battery packs 2 in the second direction.

[0089] Optionally, the floor 1 is a flat plate with a certain thickness. The straight shape can make the force on the floor 1 uniform, which is beneficial to protecting the battery cells 21 and also beneficial to the installation of the battery cells 21. Applying the floor assembly 100 to the lower vehicle body is beneficial to the cooperation between the floor 1 and the frame to improve the air tightness of the lower vehicle body. The flat plate-shaped floor 1 design can reduce the impact of the concave and convex structure formed by the structure of the floor 1 itself, such as an arc or a wave, on the installation space of the battery cells 21, thereby helping to improve the energy density of the battery cells 21.

[0090] In a second aspect, an embodiment of the present application provides an undercarriage, including a frame and the above-mentioned floor assembly 100, wherein the frame is fixed to the floor 1 and the frame and the floor 1 define a receiving cavity on one side of the thickness of the floor 1, and the battery pack 2 is disposed in the receiving cavity.

[0091] In the above technical solution, since the lower vehicle body adopts the above floor assembly 100 and the stress concentration of the shell of the battery cell 21 can be improved, it is beneficial to improve the reliability of the lower vehicle body.

[0092] In addition, the battery cells 21 and the lower body are assembled in an integrated manner. There is no need to pre-assemble the battery cells 21 into a battery pack containing a box, and there is no need to transport the battery pack to the lower body for assembly, thereby effectively reducing transportation costs and secondary assembly links; the battery cells 21 are accommodated in the accommodating cavity and connected to the floor 1, and the lower body can provide certain protection for the battery cells 21.

[0093] It is understandable that the shape, size and position of the accommodating cavity can be specifically set according to actual needs. For example, the accommodating cavity can be a circular cavity, a rectangular cavity, etc.

[0094] In a third aspect, an embodiment of the present application provides a vehicle 1000, including the above-mentioned floor assembly 100 or the above-mentioned lower vehicle body, and a battery pack 2 is used to provide electrical energy.

[0095] In the above technical solution, since the vehicle 1000 adopts the above-mentioned floor assembly 100 or lower vehicle body, it is beneficial to improve the reliability of the vehicle 1000, and can realize the integrated assembly of the battery cell 21 and the lower vehicle body. The battery cell 21 can be directly installed on the floor 1 of the lower vehicle body, which is beneficial to reduce the number of parts of the vehicle 1000, thereby better saving costs and assembly time.

[0096] In some embodiments, the vehicle 1000 includes the above-mentioned lower vehicle body, and the vehicle 1000 also includes an upper vehicle body, and the upper vehicle body is detachably connected to the lower vehicle body.

[0097] In the above technical solution, by detachably connecting the upper body to the lower body, it is convenient to realize the decoupling design of the upper body and the lower body. The lower body has a high degree of integration, which can reduce R&D costs and shorten the R&D cycle. The upper body can be replaced according to demand. In other words, the lower body can be adapted to a variety of vehicle models.

[0098] Please refer again Figure 4 and Figure 5 , describing a floor assembly 100 according to a specific embodiment of the present application.

[0099] In an embodiment of the present application, a floor assembly 100 includes a floor 1, multiple battery packs 2, and multiple cross beams 3. The multiple battery packs 2 are arranged in sequence along the second direction, and each battery pack 2 includes multiple battery cells 21 arranged in sequence along the first direction, and each battery cell 21 is adhesively fixed to the lower surface of the floor 1; multiple cross beams 3 are arranged at intervals along the first direction, and each cross beam 3 extends along the second direction. The cross beams 3 are fixed to the upper surface of the floor 1 and are used to install seats. The structures of the multiple cross beams 3 are the same or different.

[0100] One of the cross beams 3 includes two first connection parts 31 and one second connection part 32. The two first connection parts 31 are respectively located at the two ends of the cross beam 3 in the first direction and are respectively configured as flanges. The second connection part 32 is arranged between the two first connection parts 31 at intervals. The portion of the cross beam 3 located between the second connection part 32 and each first connection part 31 protrudes in a direction away from the battery pack 2, so that the cross beam 3 and the floor 1 define a second cavity 3a between the second connection part 32 and each first connection part 31.

[0101] Among them, the first connecting portion 31 is spot-welded and fixed to the floor 1, and the two first connecting portions 31 respectively correspond to the two ends of one of the battery cells 21 of each battery group 2 in the first direction, and each first connecting portion 31 spans the gap between one of the above-mentioned battery cells 21 in the battery group 2 and the corresponding adjacent battery cell 21 in the first direction, so that the crossbeam 3 corresponds to three adjacent battery cells 21; the second connecting portion 32 is spot-welded and fixed to the floor 1, and in the first direction, the second connecting portion 32 corresponds to the battery cell 21 in the middle of the above-mentioned three adjacent battery cells 21 in each battery group 2.

[0102] In the above technical solution, it is convenient to realize the reliable installation of the cross beam 3. At the same time, under the action of external force, it is convenient to realize the common stress sharing of the corresponding two adjacent battery cells 21 through the first connecting portion 31, so as to improve the stress concentration of the battery cell 21 at the position corresponding to the first connecting portion 31, which is beneficial to improving the material utilization and reliability of the floor assembly 100.

[0103] The present application conducts vibration analysis on two schemes respectively below. In scheme 1, the battery cell is fixed to the lower box, and an upper box is separately provided between the battery cell and the floor, so that the battery cell is accommodated between the upper box and the lower box, and adjacent battery cells are connected and fixed. At the same time, there is a certain gap between the battery cell and the floor. There are three crossbeams, which are respectively the first crossbeam, the second crossbeam and the third crossbeam from left to right. The cross-sectional shape of each crossbeam is roughly formed into a "J" shape. Each crossbeam has a first connecting portion at both ends in the first direction. Each first connecting portion of the second crossbeam and the gap between any two adjacent battery cells are staggered in the first direction. Similarly, each first connecting portion of the third crossbeam and the gap between any two adjacent battery cells are staggered in the first direction. Scheme 2 is different from scheme 1 in that: the battery cell is directly fixed to the bottom plate, and the battery cell is accommodated between the bottom plate and the lower box. Each first connecting portion of the second crossbeam spans the gap between two adjacent battery cells 21 of each battery group 2 in the first direction, and each first connecting portion of the third crossbeam spans the gap between two adjacent battery cells 21 of each battery group 2 in the first direction.

[0104] Under the same other conditions, vibration analysis is performed on Scheme 1 and Scheme 2 respectively. The stress diagram of the battery cell in Scheme 1 is as follows: Figure 7 As shown, the stress diagram of the battery cell in Scheme 2 is as follows Figure 8 As shown, it can be seen that the maximum stress of the battery cell corresponding to the first beam (19.4 MPa), the maximum stress of the battery cell corresponding to the second beam (34.8 MPa), and the maximum stress of the battery cell corresponding to the third beam (20.2 MPa) are all reduced.

[0105] It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The above are only preferred embodiments of this application and are not intended to limit this application. For those skilled in the art, this application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application should be included in the protection scope of this application.

Claims

1. A floor assembly for a vehicle, characterized in that: include: floor; A battery pack, the battery pack comprising a plurality of battery cells arranged in sequence along a first direction, each of the battery cells being directly fixedly connected to one side of the thickness of the floor; A crossbeam extending along a second direction and used for mounting a seat of the vehicle, the crossbeam comprising at least one first connecting portion, the first connecting portion being directly fixedly connected to the other side of the thickness of the floor, the first connecting portion spanning a gap between two adjacent battery cells of the battery pack in the first direction, and a size of the first connecting portion in the first direction being smaller than a size of the two adjacent battery cells in the first direction, the second direction intersecting with the first direction, and the second direction and the first direction being perpendicular to the thickness direction of the floor respectively.

2. The vehicle floor assembly according to claim 1, characterized in that: The battery cell is bonded and fixed to the floor; and / or, The first connection portion is fixed to the floor panel by spot welding.

3. The vehicle floor assembly according to claim 1, characterized in that: The cross beam includes a plurality of first connection portions spaced apart along the first direction. The first connection portion is located at one end of the cross beam in the first direction, or the first connection portion and two ends of the cross beam in the first direction are spaced apart from each other.

4. The vehicle floor assembly according to claim 3, characterized in that: The two ends of the crossbeam in the first direction respectively have the first connecting parts, and the two first connecting parts respectively correspond to the two ends of one of the battery cells in the battery pack in the first direction, and the part of the crossbeam located between the two first connecting parts protrudes in the direction away from the battery pack, so that the crossbeam and the floor define a first cavity between the two first connecting parts.

5. The vehicle floor assembly according to claim 1, characterized in that: The cross beam also includes a second connection portion, which is spaced apart from the first connection portion along the first direction, and the second connection portion is directly fixedly connected to the other side of the thickness of the floor. In the first direction, the second connection portion corresponds to one of the battery cells of the battery pack.

6. The vehicle floor assembly according to claim 5, characterized in that: A portion of the cross beam located between the first connection portion and the second connection portion protrudes in a direction away from the battery pack, so that the cross beam and the floor define a second cavity between the first connection portion and the second connection portion.

7. The vehicle floor assembly according to claim 6, characterized in that: The two ends of the crossbeam in the first direction respectively have the first connection parts, the two first connection parts respectively correspond to the two ends of one of the battery cells in the battery pack in the first direction, and the second connection part is located between the two first connection parts and corresponds to one of the battery cells.

8. The vehicle floor assembly according to any one of claims 1 to 7, characterized in that: The first connection portion extends along the second direction. There are multiple battery groups and the battery groups are arranged in sequence along the second direction. In the first direction, the first connection portion spans a gap between two adjacent battery cells in each battery group.

9. An undercarriage, characterized in that: The invention comprises a frame and a floor assembly of a vehicle according to any one of claims 1 to 8, wherein the frame is fixed to the floor and defines a receiving cavity with the floor on the thickness side of the floor, and the battery pack is arranged in the receiving cavity.

10. A vehicle, characterized in that: A vehicle floor assembly comprising any one of claims 1 to 8 or an undercarriage according to claim 9.

11. The vehicle according to claim 10, characterized in that The vehicle includes the lower vehicle body according to claim 10, and further includes an upper vehicle body detachably connected to the lower vehicle body.

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