Vehicle and design method thereof

Abstract

The invention discloses a vehicle and a design method thereof, and relates to the technical field of vehicles. The vehicle comprises two chassis girders, an assembly frame and a battery pack, the assembly frame comprises two first middle longitudinal beam sets and first middle cross beams, each first middle longitudinal beam set comprises at least one first middle longitudinal beam, the battery pack comprises a battery pack frame, and the battery pack frame comprises a second middle cross beam, two second side cross beam sets and two second side longitudinal beam sets. The second side cross beam sets comprise at least one second side cross beam, the two second side cross beam sets are arranged on the two sides of the second middle cross beam respectively and connected with the second middle cross beam, and the two second side longitudinal beam sets are connected with the two second side cross beam sets in a one-to-one correspondence mode and arranged on the outer sides of the corresponding second side cross beam sets. By fixedly connecting the battery pack to the assembly frame, the battery pack can be fixedly arranged below the two chassis girders, and the battery pack, the assembly frame and the chassis girders are sequentially connected, so that the mounting stability of the battery pack can be improved, the structure is reasonable, the structural strength is high, the force bearing effect is good, and the assembly is convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and more particularly to a vehicle and a design method thereof. Background Art

[0002] In related technologies, some vehicles on the market adopt an under-hung battery pack assembly structure. However, this vehicle design is unreasonable, not only with insufficient structural strength but also difficult to assemble. Therefore, there is an urgent need to optimize the structural design of vehicles with an under-hung battery pack assembly structure. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, an object of the present invention is to provide a vehicle that can improve the installation stability of the battery pack, has a reasonable structure, high structural strength, good load-bearing effect, and is convenient to assemble.

[0004] The present invention further provides a design method for the above-mentioned vehicle.

[0005] The vehicle according to an embodiment of the present invention includes: two chassis girders, the two chassis girders are opposite and spaced apart along the width direction of the vehicle, and the two chassis girders extend along the length direction of the vehicle; an assembly frame, the assembly frame includes: two groups of first middle longitudinal beam groups and a first middle cross beam, the first middle cross beam is connected between the two chassis girders, the two groups of first middle longitudinal beam groups are connected to the two chassis girders in one-to-one correspondence, and the first middle longitudinal beam group includes at least one first middle longitudinal beam; a battery pack, the battery pack includes: a battery pack frame, the battery pack frame includes: a second middle cross beam, two groups of second side cross beam groups, two groups of second side longitudinal beam groups, the second side cross beam group includes: at least one second side cross beam, the second side longitudinal beam group includes: at least one second side longitudinal beam, along the width direction of the vehicle, the two groups of second side cross beam groups are disposed on both sides of the second middle cross beam and are both connected to the second middle cross beam, and the two groups of second side longitudinal beam groups are connected to the two groups of second side cross beam groups in one-to-one correspondence and are disposed outside the corresponding second side cross beam groups; along the height direction of the vehicle, the battery pack frame is located below the assembly frame and is fixedly connected to the assembly frame.

[0006] For the vehicle according to an embodiment of the present invention, by fixedly connecting the battery pack to the assembly frame, the battery pack can be fixed below the two chassis girders and the battery pack, the assembly frame, and the chassis girders are connected in sequence, which can improve the installation stability of the battery pack, has a reasonable structure, high structural strength, good load-bearing effect, and is convenient to assemble.

[0007] In some embodiments of the present invention, the assembly frame further includes: two groups of first side crossbeam groups and two groups of first side longitudinal beam groups. Each first side crossbeam group includes at least one first side crossbeam, and each first side longitudinal beam group includes at least one first side longitudinal beam. Along the width direction of the vehicle, the two groups of first side crossbeam groups are arranged corresponding to the two chassis girders one by one and are located outside the corresponding chassis girders, and the two groups of first side longitudinal beam groups are connected to the two groups of first side crossbeam groups one by one and are arranged outside the corresponding first side crossbeam groups.

[0008] In some embodiments of the present invention, the number of first side crossbeams in one group of the first side crossbeam groups is A, the weight of the battery pack is M tons. When M > 2, the relational expression is satisfied: M / 2 ≤ A ≤ 2M; when M ≤ 2, the relational expression is satisfied: 0 ≤ A ≤ 2; and along the length direction of the vehicle, the length of the battery pack is L meters, and the relational expression is satisfied: 0.8L ≤ A ≤ 2L, where A is a positive integer; the number of first middle longitudinal beams in one group of the first middle longitudinal beam groups is B, and the relational expression is satisfied: A - 1 ≤ B ≤ 6, where B is a positive integer; the number of the first middle crossbeams is C, and the relational expression is satisfied: C ≥ A, where C is a positive integer.

[0009] In some embodiments of the present invention, the number of second side crossbeams in one group of the second side crossbeam groups is D, the number of the second middle crossbeams is E, and the number of second side longitudinal beams in one group of the second side longitudinal beam groups is F, and the relational expressions are satisfied: D ≥ 2, E ≥ 2, F ≥ 1, where D, E, and F are all positive integers.

[0010] In some embodiments of the present invention, the battery pack further includes: two groups of second middle longitudinal beam groups. Along the width direction of the vehicle, the two groups of second middle longitudinal beam groups are arranged at intervals and are located between the two groups of second side longitudinal beam groups, and the second middle longitudinal beam groups are connected to both the second side crossbeam groups and the second middle crossbeams. Each second middle longitudinal beam group includes at least one second middle longitudinal beam.

[0011] In some embodiments of the present invention, the number of second side crossbeams in one group of the second side crossbeam groups is D, the number of second middle longitudinal beams in one group of the second middle longitudinal beam groups is G, and the relational expression is satisfied: 0 ≤ G ≤ D - 1, where D is a positive integer and G is a non - negative integer; the number of the second middle crossbeams is E, and the relational expression is satisfied: D ≥ E, where E is a positive integer; the number of first side crossbeams in one group of the first side crossbeam groups is A, and the relational expression is satisfied: D ≥ A, where A is a positive integer.

[0012] In some embodiments of the present invention, there are multiple second middle crossbeams, the second middle longitudinal beam group includes multiple second middle longitudinal beams, the second side crossbeam group includes multiple second side crossbeams, and the second side longitudinal beam group includes multiple second side longitudinal beams. Along the length direction of the vehicle, the multiple second middle crossbeams, the multiple second middle longitudinal beams, the multiple second side crossbeams, and the multiple second side longitudinal beams are arranged in sequence; and along the length direction of the vehicle, the second middle crossbeams at both ends, the second side crossbeams at both ends and the second side longitudinal beams are connected end to end in sequence to form a second main frame, and the second main frame surrounds the outer sides of the remaining second middle crossbeams, the remaining second side crossbeams, and the second middle longitudinal beams.

[0013] In some embodiments of the present invention, the vehicle further includes: multiple fasteners. The first middle longitudinal beam has multiple first mounting portions, and the battery pack frame has multiple second mounting portions. The multiple first mounting portions, the multiple second mounting portions, and the multiple fasteners correspond to each other and are assembled in cooperation. The number of the first mounting portions of a group of the first middle longitudinal beam groups is H, the weight of the battery pack is S kilograms, the torque of the fasteners is T Newton meters, and the nominal diameter of the threads of the fasteners is d meters, and the relational expression is satisfied: wherein, g is the acceleration due to gravity, and the unit is meter per second -2 。

[0014] The design method of the vehicle according to the embodiments of the present invention includes: determining the number of the first side crossbeams of a group of the first side crossbeam groups of the assembly frame, wherein the weight of the battery pack is M tons, and the number of the first side crossbeams of a group of the first side crossbeam groups is A. When M > 2, the relational expression is satisfied: M / 2 ≤ A ≤ 2M; when M ≤ 2, the relational expression is satisfied: 0 ≤ A ≤ 2, and along the length direction of the vehicle, the length of the battery pack is L meters, and the relational expression is satisfied: 0.8L ≤ A ≤ 2L; determining the number B of the first middle longitudinal beams of a group of the first middle longitudinal beam groups of the assembly frame according to the formula: A - 1 ≤ B ≤ 6; determining the number C of the first middle crossbeams of the assembly frame according to the formula: C ≥ A; determining the number D of the second side crossbeams, the number E of the second middle crossbeams, and the number F of the second side longitudinal beams of a group of the second side longitudinal beam groups of the battery pack frame according to the formulas: D ≥ 2, E ≥ 2, F ≥ 1, D ≥ E, D ≥ A; determining the number G of the second middle longitudinal beams of a group of the second middle longitudinal beam groups of the battery pack frame according to the formula: 0 ≤ G ≤ D - 1.

[0015] In some embodiments of the present invention, the design method of the vehicle includes: according to the formula Determine the number H of the first mounting parts of a set of the first middle longitudinal beam groups, the weight of the battery pack is S kilograms, the torque of the fastener is T Newton meters, the nominal diameter of the thread of the fastener is d meters, the battery pack frame has a plurality of second mounting parts, and the plurality of first mounting parts and the plurality of second mounting parts correspond one by one, and the corresponding first mounting parts and second mounting parts are cooperatively assembled through the fasteners.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of embodiments in conjunction with the accompanying drawings, in which:

[0018] Figure 1 is a schematic diagram of a chassis girder, an assembly frame and a battery pack frame according to an embodiment of the present invention Figure 1 ;

[0019] Figure 2 is a schematic diagram of a chassis girder, an assembly frame and a battery pack frame according to an embodiment of the present invention Figure 2 ;

[0020] Figure 3 is a schematic diagram of a chassis girder, an assembly frame and a battery pack frame according to an embodiment of the present invention Figure 3 ;

[0021] Figure 4 is a schematic diagram of a chassis girder, an assembly frame and a battery pack frame according to an embodiment of the present invention Figure 4 ;

[0022] Figure 5 is a schematic diagram of a chassis girder, a first middle longitudinal beam and a battery pack frame according to an embodiment of the present invention;

[0023] Figure 6 is a schematic diagram of a chassis girder, an assembly frame and a battery pack frame according to an embodiment of the present invention Figure 5 ;

[0024] Figure 7 is a schematic diagram of a chassis girder, an assembly frame and a battery pack frame according to an embodiment of the present invention Figure 6 ;

[0025] Figure 8 is a schematic diagram of a chassis girder, an assembly frame and a battery pack frame according to an embodiment of the present invention Figure 7 ;

[0026] Figure 9Schematic diagram of a chassis girder, an assembly frame, and a battery pack frame according to an embodiment of the present invention Figure 8 ;

[0027] Figure 10 Schematic diagram of a chassis girder, an assembly frame, and a battery pack frame according to an embodiment of the present invention Figure 9 ;

[0028] Figure 11 Schematic diagram of a chassis girder, an assembly frame, and a battery pack frame according to an embodiment of the present invention Figure 10 ;

[0029] Figure 12 Schematic diagram of a chassis girder, an assembly frame, and a battery pack frame according to an embodiment of the present invention Figure 10 One;

[0030] Figure 13 Flowchart of a vehicle design method according to an embodiment of the present invention;

[0031] Figure 14 Flowchart of a specific embodiment of a vehicle design method according to an embodiment of the present invention.

[0032] Reference numerals:

[0033] Chassis girder 1;

[0034] Assembly frame 2; First middle crossbeam 21; First middle longitudinal beam group 22; First middle longitudinal beam 221; Fixed part 2211; Installation part 2212; First side crossbeam group 23; First side crossbeam 231; First side longitudinal beam group 24; First side longitudinal beam 241;

[0035] Battery pack frame 3; Second middle crossbeam 31; Second middle longitudinal beam group 32; Second middle longitudinal beam 321; Second side crossbeam group 33; Second side crossbeam 331; Second side longitudinal beam group 34; Second side longitudinal beam 341;

[0036] First main frame 41; Second main frame 42;

[0037] Fastener 5;

[0038] First installation part 61; Second installation part 62. Detailed description of the specific implementation

[0039] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as limiting the present invention.

[0040] The following reference is made to Figures 1 - 14Describe a vehicle and its design method according to an embodiment of the present invention.

[0041] As Figures 1 - 4 shown, a vehicle according to an embodiment of the present invention includes: two chassis girders 1, an assembly frame 2, and a battery pack. The two chassis girders 1 are opposite and spaced apart along the width direction of the vehicle, and both chassis girders 1 extend along the length direction of the vehicle. The assembly frame 2 includes: two sets of first middle longitudinal beam groups 22 and a first middle cross beam 21. The first middle cross beam 21 is connected between the two chassis girders 1. The two sets of first middle longitudinal beam groups 22 are connected to the two chassis girders 1 in a one-to-one correspondence. Each first middle longitudinal beam group 22 includes at least one first middle longitudinal beam 221. The battery pack includes: a battery pack frame 3. The battery pack frame 3 includes: a second middle cross beam 31, two sets of second side cross beam groups 33, and two sets of second side longitudinal beam groups 34. Each second side cross beam group 33 includes: at least one second side cross beam 331. Each second side longitudinal beam group 34 includes: at least one second side longitudinal beam 341. Along the width direction of the vehicle, the two sets of second side cross beam groups 33 are disposed on both sides of the second middle cross beam 31 and are both connected to the second middle cross beam 31. The two sets of second side longitudinal beam groups 34 are connected to the two sets of second side cross beam groups 33 in a one-to-one correspondence and are disposed outside the corresponding second side cross beam groups 33. Along a third direction, the battery pack frame 3 is located below the assembly frame 2 and is fixedly connected to the assembly frame 2.

[0042] As some embodiments of the present application, the two chassis girders 1 are used to support and connect assemblies such as the vehicle body and the engine of the vehicle. The two chassis girders 1 both extend along a first direction (the length direction of the vehicle), the two chassis girders 1 are opposite and spaced apart along a second direction (the width direction of the vehicle). Further, the two chassis girders 1 are arranged in parallel along the first direction. The assembly frame 2 can be connected to the chassis girders 1, and the battery pack is connected to the lower part of the chassis girders 1 through the assembly frame 2. Such a setting can improve the space utilization rate of the vehicle.

[0043] The assembly frame 2 includes two sets of first middle longitudinal beam groups 22 and a first middle cross beam 21. The two sets of first middle longitudinal beam groups 22 are connected to the two chassis girders 1 in a one-to-one correspondence. Each set of first middle longitudinal beam groups 22 includes at least one first middle longitudinal beam 221. The number of first middle longitudinal beams 221 in a set of first middle longitudinal beam groups 22 can be one, two, three, etc. When a set of first middle longitudinal beam groups 22 includes multiple first middle longitudinal beams 221, the multiple first middle longitudinal beams 221 in a set of first middle longitudinal beam groups 22 are all arranged along the length direction of the vehicle, and the multiple first middle longitudinal beams 221 in a set of first middle longitudinal beam groups 22 are spaced apart along the first direction. As some embodiments of the present invention, the two sets of first middle longitudinal beam groups 22 can be fixedly connected to the two chassis girders 1 in a one-to-one correspondence.

[0044] The battery pack may include a plurality of battery cells, and each of the plurality of battery cells can supply electrical energy to the vehicle. The plurality of battery cells are all disposed in the battery pack frame 3. Along the third direction (the height direction of the vehicle), the battery pack frame 3 is located below the assembly frame 2 and is welded or bolted to the assembly frame 2, etc. The battery pack frame 3 is used to carry the battery cells. Along the second direction, two sets of second side crossbeam groups 33 are respectively disposed on both sides of the second middle crossbeam 31 and are both connected to the second middle crossbeam 31. The number of the second middle crossbeams 31 can be one, two, three, etc. The second side crossbeam group 33 includes at least one second side crossbeam 331. The number of the second side crossbeams 331 in the second side crossbeam group 33 can be one, two, three, etc. As some embodiments of the present application, the number of the second side crossbeams 331 in one set of the second side crossbeam groups 33 is the same as the number of the second middle crossbeams 31 and they are connected in one-to-one correspondence. The second side crossbeam 331 can be bolted or welded to the second middle crossbeam 31, etc.

[0045] The second side longitudinal beam group 34 includes at least one second side longitudinal beam 341. The number of the second side longitudinal beams 341 in one set of the second side longitudinal beam groups 34 can be one, two, three, etc. When one set of the second side longitudinal beam groups 34 includes a plurality of second side longitudinal beams 341, the plurality of second side longitudinal beams 341 in one set of the second side longitudinal beam groups 34 are all arranged along the first direction. The two sets of second side longitudinal beam groups 34 are connected to the two sets of second side crossbeam groups 33 in one-to-one correspondence and are disposed outside the corresponding second side crossbeam groups 33. As some embodiments of the present application, along the length direction of the vehicle, the second side longitudinal beam 341 located at the end in each set of the second side longitudinal beam groups 34 is connected to one end of the corresponding second side crossbeam 331 away from the second middle crossbeam 31. Such a setting can make the battery pack frame 3 form a closed frame structure, so that the battery pack frame 3 can form a whole, which is convenient for transportation and assembly, convenient for being fixedly connected to the assembly frame 2, and can reliably protect the battery cells disposed in the battery pack frame 3.

[0046] In the above embodiments, by fixedly connecting the battery pack to the assembly frame 2, the battery pack can be fixedly disposed below the two chassis girders 1 and the battery pack, the assembly frame 2, and the chassis girders 1 are connected in sequence, which can improve the installation stability of the battery pack, has a reasonable structure, high structural strength, good load-bearing effect, and is convenient for assembly.

[0047] In some embodiments of the present invention, as Figure 2 shown, the assembly frame 2 further includes: two sets of first side crossbeam groups 23 and two sets of first side longitudinal beam groups 24. The first side crossbeam group 23 includes: at least one first side crossbeam 231. The first side longitudinal beam group 24 includes: at least one first side longitudinal beam 241. Along the width direction of the vehicle, the two sets of first side crossbeam groups 23 are arranged in one-to-one correspondence with the two chassis girders 1 and are located outside the corresponding chassis girders 1. The two sets of first side longitudinal beam groups 24 are connected to the two sets of first side crossbeam groups 23 in one-to-one correspondence and are disposed outside the corresponding first side crossbeam groups 23.

[0048] Among them, a set of first side crossbeam groups 23 may include at least one first side crossbeam 231. The first side crossbeam 231 extends along the second direction. The number of first side crossbeams 231 in a set of first side crossbeam groups 23 may be one, two, three, etc. When a set of first side crossbeam groups 23 includes multiple first side crossbeams 231, the multiple first side crossbeams 231 are arranged at intervals along the first direction. Along the second direction, two sets of first side crossbeam groups 23 may be arranged in one-to-one correspondence with two chassis girders 1 and are located outside the corresponding chassis girders 1.

[0049] A set of first side longitudinal beam groups 24 may include at least one first side longitudinal beam 241. The first side longitudinal beam 241 extends along the first direction. The number of first side longitudinal beams 241 in a set of first side longitudinal beam groups 24 may be one, two, three, etc. When a set of first side longitudinal beam groups 24 includes multiple first side longitudinal beams 241, the multiple first side longitudinal beams 241 are arranged in sequence along the first direction. Along the second direction, two sets of first side longitudinal beam groups 24 may be connected to two sets of first side crossbeam groups 23 in one-to-one correspondence and are arranged outside the corresponding first side crossbeam groups 23.

[0050] In the above embodiment, by arranging two sets of first side crossbeam groups 23 and two sets of first side longitudinal beam groups 24 in the assembly frame 2, the structural strength of the assembly frame 2 can be further improved, and the load-bearing capacity of the assembly frame 2 can be improved, so that the vehicle can carry a battery pack with a greater weight, thereby enhancing the capacitance of the battery pack, which is beneficial to increasing the cruising range of the vehicle.

[0051] As some embodiments of the present invention, at least one of the first side crossbeam 231, the first side longitudinal beam 241, the first middle crossbeam 21, and the first middle longitudinal beam 221 may be configured as a cast part with a hollow structure or a welded sheet metal structure, and an appropriate connection method can be reasonably selected according to requirements such as processing and manufacturing convenience, transportation economy, and dimensional tolerance.

[0052] In some embodiments of the present invention, the number of first side crossbeams 231 in a set of first side crossbeam groups 23 is A, and the weight of the battery pack is M tons. When M > 2, the relational expression is satisfied: M / 2 ≤ A ≤ 2M. When M ≤ 2, the relational expression is satisfied: 0 ≤ A ≤ 2. And along the length direction of the vehicle, the length of the battery pack is L meters, and the relational expression is satisfied: 0.8L ≤ A ≤ 2L, where A is a positive integer.

[0053] Specifically, the number of the first side cross beams 231 in a set of first side cross beam groups 23 can be reasonably set according to the weight and length of the battery pack. The number of the first side cross beams 231 in a set of first side cross beam groups 23 is A, where A is a positive integer, and the weight of the battery pack is M tons. When M > 2, that is, when the weight of the battery pack is greater than two tons, A and M satisfy relationship one: M / 2 ≤ A ≤ 2M. When M ≤ 2, that is, when the weight of the battery pack is less than or equal to two tons, A and M satisfy relationship two: 0 ≤ A ≤ 2. At the same time, the length dimension of the battery pack in the first direction is L meters, and L satisfies relationship three: 0.8L ≤ A ≤ 2L. According to the weight of the battery pack, select relationship one or relationship two to calculate the first value range of A, and then according to the length of the battery pack in the first direction, use relationship three to calculate the second value range of A. Take the intersection of the first value range and the second value range, and since A is a positive integer, the value of A can be calculated. It can be understood that A can obtain multiple positive integer values according to the calculation results, and the value of A can be reasonably selected according to the actual needs of the vehicle.

[0054] In the above embodiment, through relationship one, relationship two, relationship three, the weight of the battery pack, and the length of the battery pack in the first direction, the number of the first side cross beams 231 in a set of first side cross beam groups 23 can be calculated, so as to reasonably design the number of the first side cross beams 231 in a set of first side cross beam groups 23 according to the actual weight situation of the battery pack, so that the first side cross beam group 23 has sufficient load-bearing capacity, improve the structural strength of the assembly frame 2, and can also reduce the redundancy of the first side cross beams 231, reduce the weight of the assembly frame 2, achieve the effect of lightweight design, and save manufacturing costs.

[0055] In some embodiments of the present invention, the number of the first middle longitudinal beams 221 in a set of first middle longitudinal beam groups 22 is B, satisfying the relationship: A - 1 ≤ B ≤ 6, where B is a positive integer.

[0056] Specifically, compared with the first side cross beam 231, the first side longitudinal beam 241, and the first middle cross beam 21, the first middle longitudinal beam 221 has better stiffness. Generally speaking, the first middle longitudinal beam 221 is used as the main load-bearing structure. It can be understood that if the number of the first middle longitudinal beams 221 in a set of first middle longitudinal beam groups 22 is small, the length of each first middle longitudinal beam 221 is large, which will lead to a large degree of manufacturing deformation and poor flatness. If the number of the first middle longitudinal beams 221 in a set of first middle longitudinal beam groups 22 is large, each first middle longitudinal beam 221 is relatively independent, and the integrity of the first middle longitudinal beam group 22 is poor, and the assembly position is difficult to control.

[0057] The number of the first middle longitudinal beams 221 in a set of first middle longitudinal beam sets 22 is B, and A and B satisfy relationship four: A - 1 ≤ B ≤ 6. After calculating the number of the first side cross beams 231 in a set of first side cross beam sets 23 by using relationship one, relationship two, and relationship three, the value of B can be calculated through relationship four, and B is a positive integer. The value of B can be selected according to the manufacturing process, flatness requirements, and assembly difficulty to determine the number of the first middle longitudinal beams 221 in a set of first middle longitudinal beam sets 22, so that the first side cross beam sets 23 and the first middle longitudinal beams 221 have sufficient load-bearing capacity, improve the structural strength of the assembly frame 2, and can also reduce the redundancy of the first side cross beams 231 and the first middle longitudinal beams 221, reduce the weight of the assembly frame 2, achieve the effect of lightweight design, and save manufacturing costs.

[0058] In some embodiments of the present invention, the number of the first middle cross beams 21 is C, satisfying the relationship: C ≥ A, where C is a positive integer.

[0059] Specifically, the number of the first middle cross beams 21 is C, and C and A satisfy relationship five: C ≥ A, that is to say, the number of the first middle cross beams 21 is greater than or equal to the number of the first side cross beams 231 in a set of first side cross beam sets 23. After calculating the number of the first side cross beams 231 in a set of first side cross beam sets 23 by using relationship one, relationship two, and relationship three, the value of C can be calculated through relationship five, and C is a positive integer, so as to determine the number of the first middle cross beams 21, make the number of the first middle cross beams 21 reasonable, reduce the risk of the chassis girder 1 being pulled and inclined and deformed by the first side cross beams 231, and improve the structural stability and safety of the vehicle.

[0060] In some embodiments of the present invention, as Figure 1 and Figure 2 shown, along the length direction of the vehicle, at least two adjacent first middle cross beams 21 are provided with first middle longitudinal beams 221 therebetween.

[0061] Among them, along the first direction, at least two adjacent first middle cross beams 21 may be provided with first middle longitudinal beams 221 therebetween, so that the number of the first middle longitudinal beams 221 and the arrangement form of the first middle cross beams 21 and the first middle longitudinal beams 221 are reasonable, so that two adjacent first middle cross beams 21 and the corresponding first middle longitudinal beams 221 therebetween form a "C"-shaped structure, make the relative positions of the first middle cross beams 21 and the first middle longitudinal beams 221 reasonable, make the structure of the assembly frame 2 reasonable, and improve the structural strength of the assembly frame 2.

[0062] In some embodiments of the present invention, as Figure 1 shown, along the width direction of the vehicle, the orthographic projection of each first side cross beam 231 has an overlapping area with the orthographic projection of the first middle cross beam 21.

[0063] Among them, along the second direction, the orthographic projection of each first side crossbeam 231 has an overlapping area with the orthographic projection of the first middle crossbeam 21. That is to say, along the width direction of the vehicle, there is a corresponding first middle crossbeam 21 inside each first side crossbeam 231, so that the structure of the assembly frame 2 is more reasonable, reducing the risk of the chassis girder 1 being pulled and tilted and deformed by the first side crossbeam 231, and improving the structural stability and safety of the vehicle.

[0064] In some embodiments of the present invention, as Figure 1 and Figure 2 shown, there are multiple first middle crossbeams 21, the first middle longitudinal beam group 22 includes multiple first middle longitudinal beams 221, the first side crossbeam group 23 includes multiple first side crossbeams 231, and the first side longitudinal beam group 24 includes multiple first side longitudinal beams 241. Along the length direction of the vehicle, the multiple first middle crossbeams 21, the multiple first middle longitudinal beams 221, the multiple first side crossbeams 231, and the multiple first side longitudinal beams 241 are arranged in sequence. And along the length direction of the vehicle, the first side crossbeams 231 at both ends are respectively connected to the corresponding first side longitudinal beams 241, and the first side crossbeams 231 at both ends, the first middle crossbeams 21 at both ends, and the first side longitudinal beams 241 form a first main frame 41, and the first main frame 41 surrounds the outside of the remaining first middle crossbeams 21, the remaining first side crossbeams 231, and the first middle longitudinal beams 221.

[0065] Among them, there can be multiple first middle crossbeams 21, and the number of the first middle crossbeams 21 can be two, three, four, etc. Each first middle longitudinal beam group 22 can include multiple first middle longitudinal beams 221, and the number of the first middle longitudinal beams 221 in each first middle longitudinal beam group 22 can be two, three, four, etc. The first side crossbeam group 23 can include multiple first side crossbeams 231, and the number of the first side crossbeams 231 in each first side crossbeam group 23 can be two, three, four, etc. Each first side longitudinal beam group 24 includes multiple first side longitudinal beams 241, and the number of the first side longitudinal beams 241 in each first side longitudinal beam group 24 can be two, three, four, etc. Along the first direction, the multiple first middle crossbeams 21, the multiple first middle longitudinal beams 221, the multiple first side crossbeams 231, and the multiple first side longitudinal beams 241 are arranged in sequence.

[0066] And, along the first direction, the first side crossbeams 231 at both ends can be respectively connected to the corresponding first side longitudinal beams 241, and the first side crossbeams 231 at both ends, the first middle crossbeams 21 at both ends, and the first side longitudinal beams 241 form a first main frame 41. The first main frame 41 can be constructed into a structure similar to a "mouth" shape, and the first main frame 41 can surround the outside of the remaining first middle crossbeams 21, the remaining first side crossbeams 231, and the first middle longitudinal beams 221. Such a setting can enhance the structural strength of the assembly frame 2, so that the battery pack can be stably assembled on the assembly frame 2. At the same time, the self-weight of the assembly frame 2 can be reduced to achieve the effect of lightweight design and save costs.

[0067] In some embodiments of the present invention, the two first middle longitudinal beam groups 22 are both arranged on the inner side of the corresponding chassis beam 1 or are both arranged on the outer side of the corresponding chassis beam 1 .

[0068] Among them, the side of one of the two chassis beams 1 facing the other of the two chassis beams 1 is the inner side of the chassis beam 1, and the side of one of the two chassis beams 1 away from the other of the two chassis beams 1 is the outer side of the chassis beam 1. The two groups of first middle longitudinal beam groups 22 can be both arranged on the inner side of the corresponding chassis beam 1, or the two groups of first middle longitudinal beam groups 22 can be both arranged on the outer side of the corresponding chassis beam 1. The layout positions of the two groups of first middle longitudinal beam groups 22 can be selected according to actual needs to make the structural design more flexible to adapt to different application scenarios.

[0069] In some embodiments of the present invention, Figure 3 As shown, the first middle longitudinal beam 221 includes: a fixing portion 2211 and a mounting portion 2212, the fixing portion 2211 and the mounting portion 2212 are fixedly connected, the fixing portion 2211 is fixedly connected to the corresponding chassis beam 1, the mounting portion 2212 is used to install the battery pack, the mounting portion 2212 extends along a horizontal plane, the fixing portion 2211 extends along the height direction of the vehicle and one end of the fixing portion 2211 is connected to one end of the mounting portion 2212 or between both ends of the mounting portion 2212.

[0070] The fixing portion 2211 and the mounting portion 2212 may be fixedly connected. In some embodiments of the present invention, the fixing portion 2211 and the mounting portion 2212 may be integrally formed to improve the structural strength of the fixing portion 2211 and the mounting portion 2212 and reduce the number of parts. In other embodiments of the present invention, the fixing portion 2211 and the mounting portion 2212 may be separate parts, and the fixing portion 2211 and the mounting portion 2212 may be welded or bolted.

[0071] The fixing portion 2211 can be welded or bolted to the corresponding chassis beam 1, and the mounting portion 2212 can be welded or bolted to the battery pack frame 3, for mounting the battery pack. The cross section of the fixing portion 2211 can extend along a third direction, and the mounting portion 2212 can extend along a horizontal plane. One end of the fixing portion 2211 is connected to one end of the mounting portion 2212 or both ends of the mounting portion 2212, so that the cross section of the first middle longitudinal beam 221 can be constructed as an "L"-shaped or "T"-shaped structure, so that the first middle longitudinal beam 221 can be used as an intermediate structure connecting the chassis beam 1 and the battery pack frame 3, and the structure of the first middle longitudinal beam 221 can be simplified to reduce the weight of the first middle longitudinal beam 221 to achieve a lightweight design effect. In addition, the first middle longitudinal beam 221 can also have excellent structural strength to improve connection stability.

[0072] In some embodiments of the present invention, the number of the second side crossbeams 331 in a set of second side crossbeam groups 33 is D, the number of the second middle crossbeams 31 is E, and the number of the second side longitudinal beams 341 in a set of second side longitudinal beam groups 34 is F, satisfying the relational expression: D≥2, E≥2, F≥1, where D, E, and F are all positive integers.

[0073] Specifically, the number of the second side crossbeams 331 in a set of second side crossbeam groups 33 can be D, the number of the second middle crossbeams 31 can be E, and the number of the second side longitudinal beams 341 in a set of second side longitudinal beam groups 34 can be F. D, E, and F satisfy relational expression six: D≥2, E≥2, F≥1, and D, E, and F are all positive integers. That is to say, a set of second side crossbeam groups 33 has at least two second side crossbeams 331, a set of second side longitudinal beam groups 34 has at least one second side longitudinal beam 341, and the second middle crossbeams 31 have at least two. This can make the number of the second side crossbeams 331 in a set of second side crossbeam groups 33, the number of the second middle crossbeams 31, and the number of the second side longitudinal beams 341 in a set of second side longitudinal beam groups 34 reasonable, so as to improve the structural strength of the battery pack frame 3 while reducing the weight of the battery pack frame 3.

[0074] In some embodiments of the present invention, as Figure 1 shown, the battery pack further includes: two sets of second middle longitudinal beam groups 32. Along the width direction of the vehicle, the two sets of second middle longitudinal beam groups 32 are spaced apart and located between the two sets of second side longitudinal beam groups 34, and the second middle longitudinal beam groups 32 are connected to both the second side crossbeam groups 33 and the second middle crossbeams 31. The second middle longitudinal beam groups 32 include: at least one second middle longitudinal beam 321.

[0075] Wherein, along the second direction, the two sets of second middle longitudinal beam groups 32 can be spaced apart, both the two sets of second middle longitudinal beam groups 32 can be located between the two sets of second side longitudinal beam groups 34, a set of second middle longitudinal beam groups 32 includes at least one second middle longitudinal beam 321, and the second middle longitudinal beam 321 can extend along the first direction. When a set of second middle longitudinal beam groups 32 includes multiple second middle longitudinal beams 321, the multiple second middle longitudinal beams 321 in a set of second middle longitudinal beam groups 32 are arranged in sequence along the first direction. Moreover, the second middle longitudinal beam groups 32 are connected to both the second side crossbeam groups 33 and the second middle crossbeams 31 to improve the connection strength between various parts of the battery pack frame 3, thereby improving the structural strength of the battery pack frame 3, so that the battery pack frame 3 has better structural stability and use reliability.

[0076] In some embodiments of the present invention, the number of the second side crossbeams 331 in a set of second side crossbeam groups 33 is D, and the number of the second middle longitudinal beams 321 in a set of second middle longitudinal beam groups 32 is G, satisfying the relational expression: 0≤G≤D - 1, where D is a positive integer and G is a non - negative integer.

[0077] Specifically, the number of the second side crossbeams 331 in a set of second side crossbeam groups 33 can be D, and the number of the second middle longitudinal beams 321 in a set of second middle longitudinal beam groups 32 can be G. D and G satisfy relationship seven: 0 ≤ G ≤ D - 1, where D is a positive integer and G is a non - negative integer. That is to say, the number of the second middle longitudinal beams 321 in a set of second middle longitudinal beam groups 32 is at least one less than the number of the second side crossbeams 331 in a set of second side crossbeam groups 33, and G can be 0. That is to say, the battery pack frame 3 may not be provided with the second middle longitudinal beam 321. As some embodiments of the present invention, when the number of the second side crossbeams 331 in a set of second side crossbeam groups 33 is 2, G can be 0 or 1. When G = 1, the fixing point can be located on the second middle longitudinal beam 321, so that the assembly frame 2 and the battery pack are fixedly connected through the second middle longitudinal beam 321 and the corresponding fixing points on the assembly frame 2 (such as the corresponding fixing points on the first middle longitudinal beam 221). When G = 0, the fixing point can be located on the second side crossbeam 331, so that the assembly frame 2 and the battery pack are fixedly connected through the second side crossbeam 331 and the corresponding fixing points on the first side crossbeam 231. By relationship six and relationship seven, and reasonably setting the number of the second side crossbeams 331 in a set of second side crossbeam groups 33 and the number of the second middle longitudinal beams 321 in a set of second middle longitudinal beam groups 32 according to the actual situation, the assembly frame 2 and the battery pack frame 3 can meet the load - bearing requirements, and the weight of the battery pack frame 3 can be reduced as much as possible, so as to achieve the effect of lightweight design and is beneficial to cost saving.

[0078] In some embodiments of the present invention, the number of the second middle crossbeams 31 is E, which satisfies the relationship: D ≥ E, where E is a positive integer.

[0079] Specifically, the number of the second middle crossbeams 31 can be E. D and E can satisfy relationship eight: D ≥ E, where both D and E are positive integers. That is to say, the number of the second side crossbeams 331 in a set of second side crossbeam groups 33 is greater than or equal to the number of the second middle crossbeams 31. The second side crossbeams 331 can be used as the cantilever beams of the battery pack frame 3, and the structural strength of the second side crossbeams 331 is weaker than that of the second middle crossbeams 31. By making the number of the second side crossbeams 331 in a set of second side crossbeam groups 33 greater than or equal to the number of the second middle crossbeams 31, the number of the second side crossbeams 331 can be reasonable, and the structural strength of the battery pack frame 3 can be improved to enhance the connection stability between the battery pack and the assembly frame 2.

[0080] In some embodiments of the present invention, the number of the first side crossbeams 231 in a set of first side crossbeam groups 23 is A, which satisfies the relationship: D ≥ A, where A is a positive integer.

[0081] Specifically, the number of the first side crossbeams 231 in a set of the first side crossbeam sets 23 may be A, and A and D satisfy the relationship: D≥A, where A is a positive integer. That is to say, the number of the second side crossbeams 331 in a set of the second side crossbeam sets 33 is greater than or equal to the number of the first side crossbeams 231 in a set of the first side crossbeam sets 23. As some embodiments of the present invention, when the number of the second side crossbeams 331 in a set of the second side crossbeam sets 33 is equal to the number of the first side crossbeams 231 in a set of the first side crossbeam sets 23, the first side crossbeams 231 and the corresponding second side crossbeams 331 are fixedly connected in one-to-one correspondence. As other embodiments of the present invention, when the number of the second side crossbeams 331 in a set of the second side crossbeam sets 33 is greater than the number of the first side crossbeams 231 in a set of the first side crossbeam sets 23, the first side crossbeams 231 and the corresponding second side crossbeams 331 are fixedly connected in correspondence, and the remaining second side crossbeams 331 not fixedly connected to the first side crossbeams 231 can be used to enhance the structural strength and stiffness of the battery pack frame 3 so as to improve the structural stability of the battery pack frame 3.

[0082] In some embodiments of the present invention, as Figure 1 shown, there are multiple second middle crossbeams 31, the second middle longitudinal beam group 32 includes multiple second middle longitudinal beams 321, the second side crossbeam group 33 includes multiple second side crossbeams 331, and the second side longitudinal beam group 34 includes multiple second side longitudinal beams 341. Along the length direction of the vehicle, the multiple second middle crossbeams 31, the multiple second middle longitudinal beams 321, the multiple second side crossbeams 331, and the multiple second side longitudinal beams 341 are arranged in sequence, and along the length direction of the vehicle, the second middle crossbeams 31 at both ends, the second side crossbeams 331 at both ends and the second side longitudinal beams 341 are connected end to end in sequence to form a second main frame 42, and the second main frame 42 surrounds the outside of the remaining second middle crossbeams 31, the remaining second side crossbeams 331, and the second middle longitudinal beams 321.

[0083] Among them, there may be multiple second middle crossbeams 31, and the number of the second middle crossbeams 31 may be two, three, four, etc. A set of the second middle longitudinal beam group 32 may include multiple second middle longitudinal beams 321, and the number of the second middle longitudinal beams 321 in a set of the second middle longitudinal beam group 32 may be two, three, four, etc. The second side crossbeam group 33 may include multiple second side crossbeams 331, and the number of the second side crossbeams 331 in a set of the second side crossbeam group 33 may be two, three, four, etc. A set of the second side longitudinal beam group 34 all includes multiple second side longitudinal beams 341, and the number of the second side longitudinal beams 341 in a set of the second side longitudinal beam group 34 may be two, three, four, etc. Along the first direction, the multiple second middle crossbeams 31, the multiple second middle longitudinal beams 321, the multiple second side crossbeams 331, and the multiple second side longitudinal beams 341 are arranged in sequence.

[0084] Moreover, along the first direction, the second side crossbeams 331 at both ends can be respectively connected to the corresponding second side longitudinal beams 341, and the second middle crossbeams 31 at both ends are connected to the two adjacent second side crossbeams 331. Specifically, along the length direction of the vehicle, the second middle crossbeams 31 at both ends, the second side crossbeams 331 at both ends, and the second side longitudinal beams 341 are connected end to end in sequence to form the second main frame 42. And the second side crossbeams 331 at both ends, the second middle crossbeams 31 at both ends, and the second side longitudinal beams 341 are connected end to end in sequence to form the second main frame 42. The second main frame 42 can be constructed into a structure similar to a "mouth" shape. The second main frame 42 can surround the outside of the remaining second middle crossbeams 31, the remaining second side crossbeams 331, and the second middle longitudinal beam 321. Such a setting can enhance the structural strength of the battery pack frame 3, so that the battery pack can be stably assembled to the assembly frame 2. At the same time, the self-weight of the battery pack frame 3 can be reduced to achieve the effect of lightweight design and save costs.

[0085] In some embodiments of the present invention, the assembly frame 2 and the battery pack frame 3 are both symmetric about the length direction of the vehicle.

[0086] Among them, the assembly frame 2 and the battery pack frame 3 can both be symmetric about the central axis along the length direction of the vehicle. After the battery pack is assembled under the chassis girder 1 through the assembly frame 2 and the battery pack frame 3, the center of gravity of the battery pack can be located (or approximately located) on the central axis in the length direction of the vehicle, so that the weight of the battery pack can be evenly distributed on both sides of the central axis in the length direction of the vehicle, reducing the risk of vehicle rollover caused by uneven weight distribution of the battery pack on the vehicle during vehicle driving and turning, and ensuring the safety of the vehicle.

[0087] In some embodiments of the present invention, as Figures 3 - 5 shown, the vehicle further includes a plurality of fasteners. The first middle longitudinal beam 221 has a plurality of first mounting parts 61, and the battery pack frame 3 has a plurality of second mounting parts 62. The plurality of first mounting parts 61, the plurality of second mounting parts 62, and the plurality of fasteners correspond to each other and are assembled in cooperation. The number of first mounting parts 61 of a group of first middle longitudinal beam groups 22 is H, the weight of the battery pack is S kg, the torque of the fastener is T N·m, and the nominal diameter of the thread of the fastener is d m, satisfying the relational expression: Among them, g is the acceleration due to gravity, and the unit is m·s -2 .

[0088] Specifically, the number of first mounting parts 61 of a group of first middle longitudinal beam groups 22 can be H, H is a positive integer, the weight of the battery pack can be S kg, the torque of the fastener can be T N·m, and the nominal diameter of the thread of the fastener can be d m. H, S, T, and d satisfy relational expression nine: Among them, g is the acceleration due to gravity, and the unit is m·s -2, according to Relationship Nine, H can be calculated to determine the number of the first mounting parts 61, so as to facilitate manufacturing appropriate numbers of the first mounting parts 61 and the second mounting parts 62 on the first middle longitudinal beam 221 and the battery pack frame 3 respectively, so that the first middle longitudinal beam 221 and the battery pack frame 3 have sufficient connection strength, thereby improving the use reliability and safety of the assembly frame 2 and the battery pack frame 3.

[0089] In some embodiments of the present invention, as Figure 1 shown, the battery pack further includes: two groups of second middle longitudinal beam groups 32. Along the width direction of the vehicle, the two groups of second middle longitudinal beam groups 32 are arranged at intervals and are located between the two groups of second side longitudinal beam groups 34. The second middle longitudinal beam groups 32 are connected to both the second side cross beam group 33 and the second middle cross beam 31. The second middle longitudinal beam group 32 includes: at least one second middle longitudinal beam 321. Each first middle longitudinal beam 221 has a first mounting part 61, and each second middle longitudinal beam 321 has a second mounting part 62. The first mounting parts 61 and the second mounting parts 62 correspond to each other one by one and are assembled in cooperation.

[0090] Wherein, along the second direction, the two groups of second middle longitudinal beam groups 32 can be arranged at intervals, the two groups of second middle longitudinal beam groups 32 can both be located between the two groups of second side longitudinal beam groups 34, one group of second middle longitudinal beam groups 32 includes at least one second middle longitudinal beam 321, and the second middle longitudinal beam 321 can extend along the first direction. When one group of second middle longitudinal beam groups 32 includes multiple second middle longitudinal beams 321, the multiple second middle longitudinal beams 321 of one group of second middle longitudinal beam groups 32 are arranged in sequence along the first direction. Each first middle longitudinal beam 221 can have a first mounting part 61, the first mounting part 61 can be configured as a mounting hole, the number of the first mounting parts 61 of each first middle longitudinal beam 221 can be one, two, three, etc., each second middle longitudinal beam 321 has a second mounting part 62, the second mounting part 62 can be configured as a mounting hole, the second mounting part 62 of each second middle longitudinal beam 321 can be one, two, three, etc., the first mounting parts 61 and the second mounting parts 62 can correspond to each other one by one and can be assembled in cooperation through fasteners. The fasteners can be configured as bolts, screws, etc., so as to fixedly connect the first middle longitudinal beam 221 and the second middle longitudinal beam 321 through the first mounting part 61, the corresponding second mounting part 62, and the corresponding fasteners, so that the battery pack is fixedly connected to the assembly frame 2.

[0091] In some embodiments of the present invention, as Figure 2 shown, each first middle longitudinal beam 221 and each first side cross beam 231 have a first mounting part 61, and each second side cross beam 331 has a second mounting part 62. The first mounting parts 61 and the second mounting parts 62 correspond to each other one by one and are assembled in cooperation.

[0092] Among them, each first middle longitudinal beam 221 and each first side cross beam 231 may each have a first mounting portion 61. The first mounting portion 61 may be configured as a mounting hole. The number of the first mounting portions 61 of each first middle longitudinal beam 221 may be one, two, three, etc., and the number of the first mounting portions 61 of each first side cross beam 231 may be one, two, three, etc. Each second side cross beam 331 may have a second mounting portion 62. The second mounting portion 62 may be configured as a mounting hole. The number of the second mounting portions 62 of each second side cross beam 331 may be one, two, three, etc. The first mounting portion 61 and the second mounting portion 62 may correspond to each other one by one and may be assembled in cooperation with a fastener. The fastener may be configured as a bolt, a screw, etc., so that the first middle longitudinal beam 221, the first side cross beam 231 and the corresponding second side cross beam 331 are fixedly connected through the first mounting portion 61, the corresponding second mounting portion 62 and the corresponding fastener, so that the battery pack is fixedly connected to the assembly frame 2.

[0093] In some embodiments of the present invention, as Figures 6 - 10 shown, each first middle longitudinal beam 221 and each first side cross beam 231 each have a first, and each second middle longitudinal beam 321 and each second side cross beam 331 each have a second mounting portion 62. The first mounting portion 61 of the first middle longitudinal beam 221 corresponds to and is assembled in cooperation with the second mounting portion 62 of the second middle longitudinal beam 321 one by one, and the first mounting portion 61 of the first side cross beam 231 corresponds to and is assembled in cooperation with the second mounting portion 62 of the second side cross beam 331 one by one.

[0094] Among them, each first middle longitudinal beam 221 and each first side cross beam 231 may have a first mounting portion 61. The first mounting portion 61 may be configured as a mounting hole. The number of the first mounting portions 61 of each first middle longitudinal beam 221 may be one, two, three, etc., and the number of the first mounting portions 61 of each first side cross beam 231 may be one, two, three, etc. Each second middle longitudinal beam 321 and each second side cross beam 331 have a second mounting portion 62. The second mounting portion 62 may be configured as a mounting hole. The number of the second mounting portions 62 of each second middle longitudinal beam 321 may be one, two, three, etc., and the number of the second mounting portions 62 of each second side cross beam 331 may be one, two, three, etc. The first mounting portion 61 of the first middle longitudinal beam 221 and the second mounting portion 62 of the second middle longitudinal beam 321 may correspond one by one and may be assembled in cooperation with fasteners. The fasteners may be configured as bolts, screws, etc., so as to fixedly connect the first middle longitudinal beam 221 and the corresponding second middle longitudinal beam 321 through the first mounting portion 61, the corresponding second mounting portion 62, and the corresponding fasteners. Moreover, the first mounting portion 61 of the first side cross beam 231 and the second mounting portion 62 of the second side cross beam 331 may correspond one by one and may be assembled in cooperation with fasteners. The fasteners may be configured as bolts, screws, etc., so as to fixedly connect the first side cross beam 231 and the corresponding second side cross beam 331 through the first mounting portion 61, the corresponding second mounting portion 62, and the corresponding fasteners, thereby fixedly connecting the battery pack to the assembly frame 2 to further improve the connection strength between the battery pack and the assembly frame 2.

[0095] It can be understood that the number of the first mounting portions 61 of each first middle longitudinal beam 221 and each first side cross beam 231 may be reasonably set according to actual situations. The present invention is not limited thereto, as long as the connection strength between the battery pack and the assembly frame 2 meets the actual use requirements.

[0096] It should be noted that there is no first mounting portion 61 on some structures of the assembly frame 2. That is to say, this part of the structure is not fixedly connected to the corresponding part of the battery pack frame 3. This part of the structure can be used to enhance the structural strength and stiffness of the assembly frame 2 to improve the structural stability of the assembly frame 2. Similarly, there is no second mounting portion 62 on some structures of the battery pack frame 3. This part of the structure is not fixedly connected to the corresponding part of the assembly frame 2. This part of the structure can be used to seal the battery pack frame 3 and can enhance the structural strength and stiffness of the battery pack frame 3 to improve the structural stability of the battery pack frame 3.

[0097] In some embodiments of the present invention, as Figure 11 shown, each first middle cross beam 21 has a first mounting portion 61, and each second middle cross beam 31 has a second mounting portion 62. The first mounting portion 61 of the first middle cross beam 21 and the second mounting portion 62 of the second middle cross beam 31 correspond one by one and are assembled in cooperation.

[0098] Among them, each first middle longitudinal beam 221 and each first side cross beam 231 can each have a first mounting portion 61. The first mounting portion 61 can be configured as a mounting hole. The number of the first mounting portions 61 of each first middle longitudinal beam 221 can be one, two, three, etc., and the number of the first mounting portions 61 of each first side cross beam 231 can be one, two, three, etc. Each second middle longitudinal beam 321 and each second side cross beam 331 each have a second mounting portion 62. The second mounting portion 62 can be configured as a mounting hole. The number of the second mounting portions 62 of each second middle longitudinal beam 321 can be one, two, three, etc., and the number of the second mounting portions 62 of each second side cross beam 331 can be one, two, three, etc. The first mounting portion 61 of the first middle longitudinal beam 221 and the second mounting portion 62 of the second middle longitudinal beam 321 can be in one-to-one correspondence and can be assembled in cooperation with fasteners. The fasteners can be configured as bolts, screws, etc., so as to fixedly connect the first middle longitudinal beam 221 and the corresponding second middle longitudinal beam 321 through the first mounting portion 61, the corresponding second mounting portion 62, and the corresponding fasteners. And, the first mounting portion 61 of the first side cross beam 231 and the second mounting portion 62 of the second side cross beam 331 can be in one-to-one correspondence and can be assembled in cooperation with fasteners. The fasteners can be configured as bolts, screws, etc., so as to fixedly connect the first side cross beam 231 and the corresponding second side cross beam 331 through the first mounting portion 61, the corresponding second mounting portion 62, and the corresponding fasteners, thereby fixedly connecting the battery pack to the assembly frame 2 to further improve the connection strength between the battery pack and the assembly frame 2.

[0099] Each first middle cross beam 21 can each have a first mounting portion 61. The first mounting portion 61 can be configured as a mounting hole. The number of the first mounting portions 61 of each first middle cross beam 21 can be one, two, three, etc. Each second middle cross beam 31 can each have a second mounting portion 62. The second mounting portion 62 can be configured as a mounting hole. The number of the second mounting portions 62 of each second middle cross beam 31 can be one, two, three, etc. The first mounting portion 61 and the second mounting portion 62 can be in one-to-one correspondence and can be assembled in cooperation with fasteners. The fasteners can be configured as bolts, screws, etc., so as to fixedly connect the first middle cross beam 21 and the first middle cross beam 21 through the first mounting portion 61 of the first middle cross beam 21, the corresponding second mounting portion 62 of the second middle cross beam 31, and the corresponding fasteners, so as to fixedly connect the battery pack to the assembly frame 2 to further improve the connection strength between the battery pack and the assembly frame 2.

[0100] In some embodiments of the present invention, as Figure 12 shown, each first side longitudinal beam 241 has a first mounting portion 61, and each second side longitudinal beam 341 has a second mounting portion 62. The first mounting portion 61 of the first side longitudinal beam 241 and the second mounting portion 62 of the second side longitudinal beam 341 are in one-to-one correspondence and are assembled in cooperation.

[0101] Among them, each first middle longitudinal beam 221 and each first side cross beam 231 can each have a first mounting portion 61. The first mounting portion 61 can be configured as a mounting hole. The number of the first mounting portions 61 of each first middle longitudinal beam 221 can be one, two, three, etc., and the number of the first mounting portions 61 of each first side cross beam 231 can be one, two, three, etc. Each second middle longitudinal beam 321 and each second side cross beam 331 each have a second mounting portion 62. The second mounting portion 62 can be configured as a mounting hole. The number of the second mounting portions 62 of each second middle longitudinal beam 321 can be one, two, three, etc., and the number of the second mounting portions 62 of each second side cross beam 331 can be one, two, three, etc. The first mounting portion 61 of the first middle longitudinal beam 221 and the second mounting portion 62 of the second middle longitudinal beam 321 can be in one-to-one correspondence and can be assembled in cooperation with fasteners. The fasteners can be configured as bolts, screws, etc., so as to fixedly connect the first middle longitudinal beam 221 and the corresponding second middle longitudinal beam 321 through the first mounting portion 61, the corresponding second mounting portion 62, and the corresponding fasteners. Moreover, the first mounting portion 61 of the first side cross beam 231 and the second mounting portion 62 of the second side cross beam 331 can be in one-to-one correspondence and can be assembled in cooperation with fasteners. The fasteners can be configured as bolts, screws, etc., so as to fixedly connect the first side cross beam 231 and the corresponding second side cross beam 331 through the first mounting portion 61, the corresponding second mounting portion 62, and the corresponding fasteners, thereby fixedly connecting the battery pack to the assembly frame 2 to further improve the connection strength between the battery pack and the assembly frame 2.

[0102] Moreover, each first middle cross beam 21 can each have a first mounting portion 61. The first mounting portion 61 can be configured as a mounting hole. The number of the first mounting portions 61 of each first middle cross beam 21 can be one, two, three, etc., and each second middle cross beam 31 can each have a second mounting portion 62. The second mounting portion 62 can be configured as a mounting hole. The number of the second mounting portions 62 of each second middle cross beam 31 can be one, two, three, etc. The first mounting portion 61 and the second mounting portion 62 can be in one-to-one correspondence and can be assembled in cooperation with fasteners. The fasteners can be configured as bolts, screws, etc., so as to fixedly connect the first middle cross beam 21 and the second middle cross beam 31 through the first mounting portion 61 of the first middle cross beam 21, the corresponding second mounting portion 62 of the second middle cross beam 31, and the corresponding fasteners, so as to fixedly connect the battery pack to the assembly frame 2 to further improve the connection strength between the battery pack and the assembly frame 2.

[0103] In addition, each first side longitudinal beam 241 may have a first mounting portion 61, and the first mounting portion 61 may be configured as a mounting hole. The number of the first mounting portions 61 of each first side longitudinal beam 241 may be one, two, three, etc. Each second middle longitudinal beam 321 has a second mounting portion 62, and the second mounting portion 62 may be configured as a mounting hole. The number of the second mounting portions 62 of each second side longitudinal beam 341 may be one, two, three, etc. The first mounting portion 61 and the second mounting portion 62 may correspond to each other one by one and may be assembled by fastening members. The fastening members may be configured as bolts, screws, etc., so that the first side longitudinal beam 241 and the second side longitudinal beam 341 are fixedly connected through the first mounting portion 61, the corresponding second mounting portion 62, and the corresponding fastening members, so that the battery pack is fixedly connected to the assembly frame 2.

[0104] Figure 13 FIG. 4 is a flowchart of a design method for a vehicle according to an embodiment of the present invention. The vehicle of the above embodiment may be designed according to the flowchart of the design method for the vehicle.

[0105] As Figure 13 shown, the design method for the vehicle includes the following steps:

[0106] S1. Determine the number of first side cross beams in a group of first side cross beam groups of the assembly frame. Wherein, the weight of the battery pack is M tons, and the number of first side cross beams in a group of first side cross beam groups is A. When M>2, the relational expression is satisfied: M / 2≤A≤2M; when M≤2, the relational expression is satisfied: 0≤A≤2, and along the length direction of the vehicle, the length of the battery pack is L meters, and the relational expression is satisfied: 0.8L≤A≤2L.

[0107] Wherein, the number of first side cross beams in a group of first side cross beam groups is A, and A is a positive integer. When M>2, that is, when the weight of the battery pack is greater than two tons, A and M satisfy relational expression one: M / 2≤A≤2M. When M≤2, that is, when the weight of the battery pack is less than or equal to two tons, A and M satisfy relational expression two: 0≤A≤2. At the same time, the length dimension of the battery pack in the first direction is L meters, and L satisfies relational expression three: 0.8L≤A≤2L.

[0108] According to the weight of the battery pack, select relational expression one or relational expression two to calculate the first value range of A, and then according to the length of the battery pack in the first direction, use relational expression three to calculate the second value range of A. Take the intersection of the first value range and the second value range, and since A is a positive integer, the value of A can be calculated. It can be understood that A can obtain multiple positive integer values according to the calculation result, and the value of A can be reasonably selected according to the actual needs of the vehicle.

[0109] Thus, through Relationship One, Relationship Two, Relationship Three, the weight of the battery pack, and the length of the battery pack in the first direction, the number of first side crossbeams in a set of first side crossbeam groups can be calculated, so as to reasonably design the number of first side crossbeams in a set of first side crossbeam groups according to the actual weight of the battery pack, so that the first side crossbeam group has sufficient load-bearing capacity, improve the structural strength of the assembly frame, reduce the redundancy of the first side crossbeams, reduce the weight of the assembly frame, achieve the effect of lightweight design, and save manufacturing costs.

[0110] S2. Determine the number B of first middle longitudinal beams in a set of first middle longitudinal beam groups of the assembly frame according to the formula: A - 1 ≤ B ≤ 6.

[0111] Wherein, the number of first middle longitudinal beams in a set of first middle longitudinal beam groups is B, and A and B satisfy Relationship Four: A - 1 ≤ B ≤ 6. After calculating the number of first side crossbeams in a set of first side crossbeam groups by using Relationship One, Relationship Two, and Relationship Three, the value of B can be calculated through Relationship Four, and B is a positive integer.

[0112] Thus, the value of B can be calculated according to Relationship Four to determine the number of first middle longitudinal beams in a set of first middle longitudinal beam groups, so that the first side crossbeam group and the first middle longitudinal beams have sufficient load-bearing capacity, improve the structural strength of the assembly frame, reduce the redundancy of the first side crossbeams and the first middle longitudinal beams, reduce the weight of the assembly frame, achieve the effect of lightweight design, and save manufacturing costs.

[0113] S3. Determine the number C of first middle crossbeams of the assembly frame according to the formula: C ≥ A.

[0114] Wherein, the number of first middle crossbeams is C, and C and A satisfy Relationship Five: C ≥ A. That is to say, the number of first middle crossbeams is greater than or equal to the number of first side crossbeams in a set of first side crossbeam groups. After calculating the number of first side crossbeams in a set of first side crossbeam groups by using Relationship One, Relationship Two, and Relationship Three, the value of C can be calculated through Relationship Five, and C is a positive integer.

[0115] Thus, the value of C can be calculated according to Relationship Five to determine the number of first middle crossbeams, so that the number of first middle crossbeams is reasonable, reduce the risk of the chassis girder being pulled and tilted and deformed by the first side crossbeams, and improve the structural stability and safety of the vehicle.

[0116] In some embodiments of the present invention, the vehicle design method further includes: determining the number D of second side crossbeams, the number E of second middle crossbeams, and the number F of second side longitudinal beams in a set of second side longitudinal beam groups of the battery pack frame according to the formulas: D ≥ 2, E ≥ 2, F ≥ 1, D ≥ E, D ≥ A; determining the number G of second middle longitudinal beams in a set of second middle longitudinal beam groups of the battery pack frame according to the formula: 0 ≤ G ≤ D - 1.

[0117] Among them, the number of the second side cross beams in a group of second side cross beam groups can be D, the number of the second middle cross beams can be E, the number of the second side longitudinal beams in a group of second side longitudinal beam groups can be F, and D, E, and F satisfy the relationship six: D≥2, E≥2, F≥1, and D, E, and F are all positive integers. The number of the second middle cross beams can be E, and D and E can satisfy the relationship eight: D≥E, and D and E are both positive integers. The number of the first side cross beams in a group of first side cross beam groups can be A, and A and D satisfy the relationship: D≥A, and A is a positive integer.

[0118] Thus, the values of D, E, and F can be calculated to determine the number of the second side cross beams, the number of the second middle cross beams, and the number of the second side longitudinal beams in a group of second side longitudinal beam groups, so that the number of the second side cross beams, the number of the second middle cross beams, and the number of the second side longitudinal beams are reasonable, so that the battery pack frame has reliable structural strength and improves the structural stability of the battery pack frame.

[0119] The number of the second middle longitudinal beams in a group of second middle longitudinal beam groups can be G, and D and G satisfy the relationship seven: 0≤G≤D - 1, D is a positive integer, and G is a non - negative integer. That is to say, the number of the second middle longitudinal beams in a group of second middle longitudinal beam groups is at least one less than the number of the second side cross beams in a group of second side cross beam groups, and G can be 0. That is to say, the battery pack frame may not be provided with the second middle longitudinal beam. As some embodiments of the present invention, when the number of the second side cross beams in a group of second side cross beam groups is 2, G can be 0 or 1. When G = 1, the installation point can be located on the second middle longitudinal beam to fixedly connect the assembly frame and the battery pack through the second middle longitudinal beam and the corresponding fixed point of the assembly frame (such as the corresponding fixed point on the first middle longitudinal beam). When G = 0, the fixed point can be located on the second side cross beam to fixedly connect the assembly frame and the battery pack through the second side cross beam and the corresponding fixed point on the first side cross beam.

[0120] Thus, through the relationship six and the relationship seven, and reasonably setting the number of the second side cross beams in a group of second side cross beam groups and the number of the second middle longitudinal beams in a group of second middle longitudinal beam groups according to the actual situation, the assembly frame and the battery pack frame can meet the load - bearing requirements, and the weight of the battery pack frame can be reduced as much as possible to achieve the effect of lightweight design and is beneficial to cost savings.

[0121] In some embodiments of the present invention, the design method of the vehicle includes: According to the formula Determine the number H of the first mounting parts of a set of first middle longitudinal beams. The weight of the battery pack is S kilograms, the torque of the fastener is T Newton - meters, the nominal diameter of the thread of the fastener is d meters, g is the acceleration due to gravity, the battery pack frame has a plurality of second mounting parts, and the plurality of first mounting parts and the plurality of second mounting parts correspond one - to - one. The corresponding first mounting part and second mounting part are cooperatively assembled through the fastener.

[0122] Among them, the number of the first mounting parts of a set of first middle longitudinal beams can be H, H is a positive integer, the weight of the battery pack can be S kilograms, the torque of the fastener can be T Newton - meters, the nominal diameter of the thread of the fastener can be d meters, and H, S, T, d satisfy relation nine: where g is the acceleration due to gravity, and the unit is meter·second -2 According to relation nine, H can be calculated.

[0123] The battery pack frame has a plurality of second mounting parts, and the plurality of first mounting parts and the plurality of second mounting parts correspond one - to - one. The corresponding first mounting part and second mounting part are cooperatively assembled through the fastener. As some embodiments of the present application, each first middle longitudinal beam can have a first mounting part, each second middle longitudinal beam has a second mounting part, and the first middle longitudinal beam and the second middle longitudinal beam are fixedly connected through the first mounting part, the corresponding second mounting part, and the corresponding fastener.

[0124] As some embodiments of the present application, each first middle longitudinal beam and each first side cross - beam can have a first mounting part, each second side cross - beam can have a second mounting part, and the first middle longitudinal beam, the first side cross - beam and the corresponding second side cross - beam are fixedly connected through the first mounting part, the corresponding second mounting part, and the corresponding fastener.

[0125] As some embodiments of the present application, each first middle longitudinal beam and each first side cross - beam can have a first mounting part, each second middle longitudinal beam and each second side cross - beam have a second mounting part. The first side cross - beam is fixedly connected to the corresponding second side cross - beam through the first mounting part, the corresponding second mounting part, and the corresponding fastener. The first middle longitudinal beam is fixedly connected to the corresponding second middle longitudinal beam through the first mounting part, the corresponding second mounting part, and the corresponding fastener.

[0126] As some embodiments of the present application, each first middle cross - beam can have a first mounting part, each second middle cross - beam can have a second mounting part. The first middle cross - beam is fixedly connected to the second middle cross - beam through the first mounting part of the first middle cross - beam, the corresponding second mounting part of the second middle cross - beam, and the corresponding fastener. The first side cross - beam is fixedly connected to the corresponding second side cross - beam through the first mounting part, the corresponding second mounting part, and the corresponding fastener. The first middle longitudinal beam is fixedly connected to the corresponding second middle longitudinal beam through the first mounting part, the corresponding second mounting part, and the corresponding fastener.

[0127] As some embodiments of the present application, each first side longitudinal beam may have a first mounting portion, and each second side longitudinal beam has a second mounting portion. The first side longitudinal beam and the second side longitudinal beam are fixedly connected through the first mounting portion, the corresponding second mounting portion, and the corresponding fasteners. The first side cross beam and the corresponding second side cross beam are fixedly connected through the first mounting portion, the corresponding second mounting portion, and the corresponding fasteners. The first middle longitudinal beam and the corresponding second middle longitudinal beam are fixedly connected through the first mounting portion, the corresponding second mounting portion, and the corresponding fasteners.

[0128] Thus, the value of H can be calculated through Equation (9) to determine the number of first mounting portions of a set of first middle longitudinal beams, so as to facilitate manufacturing appropriate numbers of first mounting portions and second mounting portions on the first middle longitudinal beam and the battery pack frame respectively, so that the first middle longitudinal beam and the battery pack frame have sufficient connection strength, thereby improving the use reliability and safety of the assembly frame and the battery pack frame.

[0129] As Figure 14 shown, as a specific embodiment of the present invention, the above vehicle design method may include the following steps:

[0130] S01. Determine the number of first side cross beams of a set of first side cross beam groups of the assembly frame. Wherein, the weight of the battery pack is M tons, and the number of first side cross beams of a set of first side cross beam groups is A. When M > 2, the relationship is satisfied: M / 2 ≤ A ≤ 2M; when M ≤ 2, the relationship is satisfied: 0 ≤ A ≤ 2, and along the length direction of the vehicle, the length of the battery pack is L meters, and the relationship is satisfied: 0.8L ≤ A ≤ 2L;

[0131] S02. Determine the number B of first middle longitudinal beams of a set of first middle longitudinal beam groups of the assembly frame according to the formula: A - 1 ≤ B ≤ 6;

[0132] S03. Determine the number C of first middle cross beams of the assembly frame according to the formula: C ≥ A;

[0133] S04. Determine the number D of second side cross beams, the number E of second middle cross beams, and the number F of second side longitudinal beams of a set of second side longitudinal beam groups of the battery pack frame according to the formulas: D ≥ 2, E ≥ 2, F ≥ 1, D ≥ E, D ≥ A;

[0134] S05. Determine the number G of second middle longitudinal beams of a set of second middle longitudinal beam groups of the battery pack frame according to 0 ≤ G ≤ D - 1;

[0135] S06. According to the formula Determine the number H of the first mounting parts of a set of first middle longitudinal beams. The weight of the battery pack is S kilograms, the torque of the fastener is T Newton - meters, the nominal diameter of the thread of the fastener is d meters, g is the acceleration due to gravity. The battery pack frame has a plurality of second mounting parts. The plurality of first mounting parts and the plurality of second mounting parts correspond one by one, and the corresponding first mounting parts and second mounting parts are assembled by fasteners.

[0136] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0137] In the description of the present invention, the "first feature" and "second feature" may include one or more of such features.

[0138] In the description of the present invention, the meaning of "a plurality of" is two or more.

[0139] In the description of the present invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween.

[0140] In the description of the present invention, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature.

[0141] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above - mentioned terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0142] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A vehicle, characterized in that: include: Two chassis beams (1), the two chassis beams (1) are opposite to each other and spaced apart in the width direction of the vehicle, and the two chassis beams (1) extend in the length direction of the vehicle; An assembly frame (2), the assembly frame (2) comprising: two groups of first middle longitudinal beam groups (22) and a first middle cross beam (21), the first middle cross beam (21) being connected between the two chassis beams (1), the two groups of the first middle longitudinal beam groups (22) being connected and arranged in a one-to-one correspondence with the two chassis beams (1), the first middle longitudinal beam groups (22) comprising at least one first middle longitudinal beam (221); A battery pack, the battery pack comprising: a battery pack frame (3), the battery pack frame (3) comprising: a second middle cross beam (31), two groups of second side cross beam groups (33), and two groups of second side longitudinal beam groups (34), the second side cross beam group (33) comprising: at least one second side cross beam (331), the second side longitudinal beam group (34) comprising: at least one second side longitudinal beam (341), along the width direction of the vehicle, the two groups of the second side cross beam groups (33) are arranged on both sides of the second middle cross beam (31) and are both connected to the second middle cross beam (31), the two groups of the second side longitudinal beam groups (34) are connected to the two groups of the second side cross beam groups (33) in a one-to-one correspondence and are arranged on the outer sides of the corresponding second side cross beam groups (33); Along the height direction of the vehicle, the battery pack frame (3) is located below the assembly frame (2) and is fixedly connected to the assembly frame (2).

2. The vehicle according to claim 1, characterized in that The assembly frame (2) further comprises: two groups of first side cross beam groups (23) and two groups of first side longitudinal beam groups (24); the first side cross beam groups (23) comprise: at least one first side cross beam (231); the first side longitudinal beam groups (24) comprise: at least one first side longitudinal beam (241); along the width direction of the vehicle, the two groups of the first side cross beam groups (23) are arranged in one-to-one correspondence with the two chassis beams (1) and are located on the outside of the corresponding chassis beams (1); the two groups of the first side longitudinal beam groups (24) are connected to the two groups of the first side cross beam groups (23) in one-to-one correspondence and are arranged on the outside of the corresponding first side cross beam groups (23).

3. The vehicle according to claim 2, characterized in that The number of the first side beams (231) in a group of the first side beam groups (23) is A, the weight of the battery pack is M tons, and when M>2, the relationship is satisfied: M / 2≤A≤2M; when M≤2, the relationship is satisfied: 0≤A≤2; And along the length direction of the vehicle, the length of the battery pack is L meters, satisfying the relationship: 0.8L≤A≤2L, where A is a positive integer; the number of the first middle longitudinal beams (221) in a group of the first middle longitudinal beams (22) is B, satisfying the relationship: A-1≤B≤6, where B is a positive integer; The number of the first middle cross beams (21) is C, satisfying the relationship: C≥A, wherein C is a positive integer.

4. The vehicle according to claim 1, characterized in that The number of the second side cross beams (331) in a group of the second side cross beam groups (33) is D, the number of the second middle cross beams (31) is E, and the number of the second side longitudinal beams (341) in a group of the second side longitudinal beam groups (34) is F, satisfying the relationship: D≥2, E≥2, F≥1, wherein D, E, and F are all positive integers.

5. The vehicle according to claim 2, characterized in that The battery pack further comprises: two groups of second middle longitudinal beam groups (32); along the width direction of the vehicle, the two groups of second middle longitudinal beam groups (32) are arranged at intervals and are located between the two groups of second side longitudinal beam groups (34); the second middle longitudinal beam group (32) is connected to the second side cross beam group (33) and the second middle cross beam (31); the second middle longitudinal beam group (32) comprises: at least one second middle longitudinal beam (321).

6. The vehicle according to claim 5, characterized in that The number of the second side cross beams (331) of a group of the second side cross beam groups (33) is D, and the number of the second middle longitudinal beams (321) of a group of the second middle longitudinal beam groups (32) is G, satisfying the relationship: 0≤G≤D-1, wherein D is a positive integer and G is a non-negative integer; The number of the second middle cross beams (31) is E, satisfying the relationship: D≥E, where E is a positive integer; The number of the first side cross beams (231) in a group of the first side cross beams (23) is A, satisfying the relationship: D≥A, wherein A is a positive integer.

7. The vehicle according to claim 5, characterized in that There are a plurality of the second middle cross beams (31), the second middle longitudinal beam group (32) includes a plurality of the second middle longitudinal beams (321), the second side cross beam group (33) includes a plurality of the second side cross beams (331), and the second side longitudinal beam group (34) includes a plurality of the second side longitudinal beams (341), and along the length direction of the vehicle, the plurality of the second middle cross beams (31), the plurality of the second middle longitudinal beams (321), the plurality of the second side cross beams (331), and the plurality of the second side longitudinal beams (341) are sequentially arranged; Furthermore, along the length direction of the vehicle, the second middle cross beams (31) at both ends, the second side cross beams (331) at both ends, and the second side longitudinal beams (341) are connected end to end in sequence to form a second main frame (42), and the second main frame (42) surrounds the outside of the remaining second middle cross beams (31), the remaining second side cross beams (331), and the second middle longitudinal beam (321).

8. The vehicle according to any one of claims 1 to 7, characterized in that: Also includes: A plurality of fasteners, the first middle longitudinal beam (221) has a plurality of first mounting portions (61), the battery pack frame (3) has a plurality of second mounting portions (62), the plurality of first mounting portions (61), the plurality of second mounting portions (62), and the plurality of fasteners correspond to each other and are assembled in coordination, the number of the first mounting portions (61) of a group of the first middle longitudinal beams (22) is H, the weight of the battery pack is S kilograms, the torque of the fastener is T Newton meters, the nominal thread diameter of the fastener is d meters, and the relationship is satisfied: Where g is the acceleration due to gravity, in meters per second -2 .

9. A vehicle design method, characterized in that: include: Determine the number of first side beams of a first side beam group of the assembly frame, wherein the weight of the battery pack is M tons, the number of the first side beams of a first side beam group is A, and when M>2, the relationship is satisfied: M / 2≤A≤2M; when M≤2, the relationship is satisfied: 0≤A≤2, and along the length direction of the vehicle, the length of the battery pack is L meters, satisfying the relationship: 0.8L≤A≤2L; Determine the number B of the first middle longitudinal beams of a group of first middle longitudinal beams of the assembly frame according to the formula: A-1≤B≤6; Determine the number C of the first middle beams of the assembly frame according to the formula: C≥A; According to the formula: D≥2, E≥2, F≥1, D≥E, D≥A, determine the number D of the second side beams of a second side beam group, the number E of the second middle beams, and the number F of the second side longitudinal beams of a second side longitudinal beam group of the battery pack frame; The number G of the second middle longitudinal beams of a group of second middle longitudinal beams of the battery pack frame is determined according to the formula: 0≤G≤D-1.

10. The vehicle design method according to claim 9, characterized in that: include: According to the formula Determine the number H of first mounting parts of a group of the first middle longitudinal beams, the weight of the battery pack is S kilograms, the torque of the fastener is T Newton meters, the nominal thread diameter of the fastener is d meters, the battery pack frame has multiple second mounting parts, the multiple first mounting parts and the multiple second mounting parts correspond one to one, and the corresponding first mounting parts and the second mounting parts are assembled together through the fasteners.

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