CN117227566A

CN117227566A - Electric vehicle and power conversion method

Info

Publication number: CN117227566A
Application number: CN202211736649.0A
Authority: CN
Inventors: 张建平; 于新瑞; 褚佳玮
Original assignee: Aulton New Energy Automotive Technology Co Ltd
Current assignee: Aulton New Energy Automotive Technology Co Ltd
Priority date: 2022-12-01
Filing date: 2022-12-30
Publication date: 2023-12-15
Also published as: CN219312727U; CN220180550U; CN116653574A; CN219769680U; CN219106430U; CN117227568A; CN118124535A; CN118124528A; CN117774639A; CN219658866U; CN118124529A; CN219096674U; CN220076109U; CN117227668A; WO2024114727A1; CN116653873A; CN118124445A; CN219096675U; CN117227565A; CN118124446A

Abstract

The application discloses an electric vehicle and a power conversion method, comprising a plurality of sections of vehicle beams which are sequentially arranged along the length direction of the vehicle, wherein battery packs are arranged on at least two sections of the vehicle beams, and at least one battery pack is a power conversion battery pack which is detachably connected with the vehicle beams. According to the application, at least two sections of vehicle beams are provided with battery packs, wherein at least one battery pack is a battery pack for battery replacement, so that the battery packs for battery replacement can be conveniently installed according to requirements, a power source can be rapidly provided for a vehicle from the outside, the characteristics of the vehicle with multiple sections of vehicle beams are fully utilized to finish the scattered installation of the battery packs, the problem that the battery packs are difficult to replace due to overlarge volume and weight of the single battery pack can be avoided, the load-bearing requirement on a locking piece is reduced, the battery packs which are scattered and installed at the vehicle beams can better balance the load of the vehicle beams, the influence on the stability of the vehicle is reduced, the space utilization ratio space of the battery packs is improved, and when one battery pack is damaged, the existence of other battery packs ensures the normal operation of the electric vehicle.

Description

Electric vehicle and power conversion method

The present application claims priority from chinese patent application CN2022115318647, whose filing date is 2022, 12, 1. The present application incorporates the entirety of the above-mentioned chinese patent application.

Technical Field

The invention relates to the technical field of power conversion, in particular to a related device applied to power conversion equipment and a power conversion vehicle and a working method thereof.

Background

Currently, electric utility vehicles, such as electric trucks, are increasingly emerging in many application scenarios for these vehicles. Because commercial vehicles such as electric trucks and the like have larger capacity demands on battery packs, the charging time of the battery packs is overlong, the capacity and the service life of the battery packs can be greatly reduced no matter what type of battery packs are charged by quick charging at present, even the battery packs are charged quickly, the battery packs need to be charged for nearly half an hour, the charging cost can be greatly increased in the peak period of electricity consumption, and the service efficiency of the electric heavy truck vehicle is affected.

Based on the reasons, the power conversion mode is operated, so that a great amount of time can be saved when the power conversion is firstly performed, the power can be avoided from the peak of power consumption for charging when the power conversion is performed, and the space occupied by the power conversion is small when the power conversion is performed again.

Currently, in the related art, the entire battery pack is generally disposed on a body girder. However, the problem that the battery pack is heavy and the mounting position is too concentrated causes a large load on the vehicle beam, which easily affects the structural strength of the vehicle beam and the stability of the vehicle during running is generally existed.

Disclosure of Invention

The invention aims to solve the technical problem that in the prior art, the vehicle beams of the electric vehicle are all single and integrally arranged, and the battery packs are arranged at the bottom of the electric vehicle in a mode of arranging a plurality of vehicle beams and a plurality of battery packs.

The invention solves the technical problems by the following technical scheme:

the utility model provides an electric vehicle, includes the multistage roof beam that arranges in proper order along vehicle length direction, install the battery package on two sections at least roof beams in the multistage roof beam, and wherein at least one battery package be with car roof beam detachable connection's battery package that trades.

In the scheme, the battery packs are arranged on at least two sections of vehicle beams, wherein at least one battery pack is a battery pack for replacing electricity, so that the battery pack for replacing electricity can be conveniently arranged according to the requirement, a power source can be rapidly provided for a vehicle from the outside, and the characteristics of the vehicle with multiple sections of vehicle beams can be fully utilized to finish the scattered installation of the battery packs; can avoid the volume weight of single battery package too big to lead to trading the electric difficulty, reduce the bearing requirement to the locking piece to the battery package of dispersion installation department in the roof beam can balance the load of roof beam better, reduces the influence to vehicle stability, improves the space utilization space of battery package installation, and when one of them battery package damages, the normal operating of electric vehicle has been guaranteed to the existence of other battery packages.

Preferably, one or more battery packs are mounted on a section of the vehicle beam, and the plurality of battery packs are arranged along the width direction and/or the length direction of the electric vehicle.

When a plurality of battery packs are arranged at the vehicle beam in the scheme, the battery packs are distributed along the width and/or length direction of the vehicle, so that the effect of sub-packaging the battery packs at the single vehicle beam can be achieved, and the volume and the weight of the single battery pack are reduced under the condition that the required battery pack capacity and the battery density at the single vehicle beam cannot be changed, so that the manufacturing difficulty of the battery pack is reduced; when the battery pack is a battery pack for replacing electricity, the burden of the battery replacement equipment can be effectively reduced.

Preferably, the battery pack is disposed at a side portion and/or a lower portion of the vehicle beam.

In the scheme, the battery pack is arranged at the side part and/or the lower part of the vehicle beam, so that the mounting position of the battery pack can be conveniently set according to the shape and the size of the vehicle beam and the height of the vehicle beam; when the battery pack is mounted on the side part of the vehicle beam, the limit of the structure of the vehicle beam on the mounting height of the battery pack can be avoided; when the battery package is installed in the lower part of roof beam, can effectively utilize the space of roof beam below, the load that the roof beam bore simultaneously is vertical down, is difficult for causing the upset of vehicle. When the battery packs are mounted at the side and lower portions of the vehicle beam, respectively, the maximization of the vehicle beam space utilization can be achieved.

Preferably, the heights of the plurality of sections of vehicle beams are different, and the heights of the bottom surfaces of the battery packs arranged on the plurality of sections of vehicle beams are the same or different.

In the scheme, the heights of the multiple sections of vehicle beams are different, so that vehicles with the multiple sections of vehicle beams such as a trailer or a trailer can be conveniently formed in a matched mode; in this kind of setting mode, the two sections car roof beams of difference in height can overlap joint each other in vertical, and then accomplish the connection of multistage roof beam body. In the scheme, when the heights of the multi-section vehicle beams are different, if the mounting modes of the battery packs and the vehicle beams and the heights of the body of the battery packs are the same, the condition that the heights of the bottom surfaces of the battery packs are different can occur, and then the adaptation difficulty of the battery replacement equipment is increased when the battery replacement of the electric vehicle is disassembled and replaced; in this scheme, when multistage roof beam highly is different, still keep the bottom surface height of battery package the same, can effectively avoid the inconsistent problem that produces of battery package bottom surface height.

Preferably, the body heights of the battery packs arranged on the multi-section vehicle beam are different.

Under the condition of different heights of the vehicle beams, the battery packs with different heights of the body are installed at the vehicle beams with different heights, and the influence of the heights of the vehicle beams on the heights of the bottom surfaces of the battery packs is compensated by utilizing the heights of the battery packs.

Or, the body heights of the battery packs installed on the multi-section vehicle beam are the same, and at least one battery pack is installed on the vehicle beam through the installation support, so that the installation heights of the battery packs on the multi-section vehicle beam are the same.

In this scheme, at multistage roof beam difference in height, and under the circumstances that the battery package body is high the same, compensate the installation height of battery package through the installing support, and then compensate the influence of roof beam height to battery package bottom surface height.

Or, the battery pack is arranged at the bottom of the vehicle beam with higher height in the multi-section vehicle beam, and the battery pack is arranged at the side part of the vehicle beam with lower height in the multi-section vehicle beam.

In the scheme, part of battery packs are arranged at the bottom of a higher vehicle beam at different heights of a plurality of sections of vehicle beams, and the other part of battery packs are arranged at the side part of a vehicle with lower height, so that the arrangement mode utilizes the limit effect of the thickness of the vehicle beam on the installation position of the battery packs; the bottom surface height of the battery pack at the position of the higher vehicle beam is reduced in space, the bottom surface height of the battery pack at the position of the lower vehicle beam is improved, the effect that the ground heights of the battery packs at the positions of the beam bodies with different heights are the same in multiple sections is achieved, and the influence of the difference of the heights of the vehicle beams on the bottom surface height of the battery pack is avoided.

Preferably, a first mounting bracket is arranged on a vehicle beam with higher height in the multi-section vehicle beam, and the first mounting bracket extends downwards relative to the vehicle beam;

and/or a second mounting bracket is arranged on the vehicle beam with lower height in the multi-section vehicle beam, and the second mounting bracket extends upwards relative to the vehicle beam.

In the scheme, a first mounting bracket extending downwards is arranged at a vehicle beam with a higher height, and a second mounting bracket facing upwards vertically is arranged at a vehicle beam with a lower height; the first bracket and the second bracket are utilized to make up the condition that the heights of the multi-section vehicle beams are different along the vertical extension; the first mounting bracket and the second mounting bracket are selectively used, so that the battery pack directly mounted at the vehicle beam in the scheme can be hung at a relatively low height position or can be mounted at a relatively high position; the limit on the installation position of the battery pack is reduced; when the height of the battery pack body and the height values of the multi-section beam body are unchanged, the mode can be used for conveniently adjusting the bottom surface height of the battery pack.

Preferably, in the width direction of the electric vehicle, the widths of the plurality of segments of vehicle beams are different, and the widths of the outer sides of the battery packs mounted on the plurality of segments of vehicle beams are the same or different.

In the scheme, the widths of the multiple sections of vehicle beams are different, so that vehicles with multiple sections of different vehicle beams such as a trailer or a trailer can be conveniently formed in a matched mode; in the arrangement mode, each section of the vehicle beam with different widths is convenient to adapt to the chassis or the carriage part of the current vehicle so as to meet different bearing requirements.

In the scheme, when the widths of the multi-section vehicle beams are different, if the installation modes of the battery packs and the vehicle beams and the widths of the body of the battery packs are the same, the situation that the distances between the outer side surfaces of the battery packs and the center of the vehicle beams are different can occur, and then the adapting difficulty of the battery replacing equipment is increased when the battery replacing equipment of the electric vehicle is disassembled and replaced; in this scheme, when multistage roof beam highly is different, still keep the outside width of battery package the same, when utilizing one set of battery replacement equipment to accomplish the battery package of different roof beam departments in proper order and trade the electricity, can improve the suitability of battery replacement equipment.

Preferably, the body widths of the battery packs mounted on the multi-section vehicle beam are different. According to the scheme, under the condition that the widths of the vehicle beams are different, the battery packs with different widths are arranged at the vehicle beams with different widths, and the influence of the vehicle beam widths on the positions of the outer side faces of the battery packs and the positions of the centers of the battery packs is compensated by utilizing the widths of the battery pack bodies; so as to reduce the adapting difficulty of the power exchanging equipment.

Or the body widths of the battery packs mounted on the multi-section vehicle beam are the same, and at least one battery pack is mounted to the vehicle beam through a mounting bracket, so that the mounting positions of the battery packs on the multi-section vehicle beam in the width direction of the electric vehicle are the same; in this scheme, at multistage roof beam width difference, and under the same circumstances of battery package body width, compensate the lateral surface position deviation and the battery package central point deviation after the installation of battery package through the installing support, and then compensatied the influence of roof beam width difference to battery package central point and put, reduced the adaptation degree of difficulty of trading electric equipment.

Or, the battery pack is arranged at the bottom of the vehicle beam with larger width in the multi-section vehicle beam, and the battery pack is arranged at the side part of the vehicle beam with smaller width in the multi-section vehicle beam. In the scheme, at different widths of the multi-section vehicle beams, part of battery packs are arranged at the bottom of the vehicle beam with higher middle width, and the other part of battery packs are arranged at the side part of the vehicle beam with smaller width in the multi-section vehicle beam, and the arrangement mode utilizes the limit effect of the vehicle beam width on the installation position of the battery packs; the numerical value of the outer side face of the battery pack at the position of the wider vehicle beam from the center of the vehicle is reduced in space, the distance between the outer side face of the battery pack at the position of the smaller vehicle beam and the center of the vehicle is increased, the deviation of the distance between the outer side face of the battery pack at the position of the different vehicle beams and the center of the vehicle and the deviation of the position of the center point of the battery pack are made up, and the difficulty of battery pack adaptation of the battery exchange equipment at the position of the different vehicle beams is reduced.

Preferably, a first mounting bracket is arranged on the vehicle beam with a larger width in the multi-section vehicle beam, and the first mounting bracket extends inwards relative to the vehicle beam.

And/or a second mounting bracket is arranged on the vehicle beam with smaller width in the multi-section vehicle beam, and the second mounting bracket extends outwards relative to the vehicle beam.

In the scheme, a first mounting bracket extending inwards is arranged at a vehicle beam with a larger width, and a second mounting bracket extending outwards is arranged at a vehicle beam with a smaller width, wherein in the arrangement mode; the first bracket and the second bracket are utilized to extend along the width direction to make up the situation that the widths of the plurality of sections of vehicle beams are different; the first mounting bracket and the second mounting bracket are selectively used, so that the position of the battery pack directly mounted at the vehicle beam in the scheme can be adjusted; the limit on the installation position of the battery pack is reduced; when the width of the battery pack body and the width of the multi-section beam body are unchanged, the mode can be used for conveniently adjusting the position of the outer side face and the center of the battery pack.

Preferably, the mounting bracket comprises a bracket body and a fixing piece; the support body is through mounting with roof beam fixed connection, the battery package install in on the support body, multistage roof beam is last to be connected the support body is the same.

In the scheme, the mounting bracket comprises a bracket body and a fixing piece, wherein the bracket body is used for mounting a battery pack, and the fixing piece is used for connecting the bracket body and the vehicle beam; under the condition that the structure of the bracket body is unchanged, the position of the bracket body relative to the center of the vehicle can be adjusted by changing the size of the fixing piece, so that the installation position of the battery pack can be adjusted; under the condition of improving the suitability of the mounting bracket, the universality of the mounting bracket can be improved as much as possible, and the design and manufacturing difficulty of the mounting bracket can be reduced.

Preferably, the fixing piece is a C-shaped beam or an I-shaped beam; the fixing piece is fixed with the vehicle beam through bolts or welding.

In the scheme, the fixing piece adopts a common C-shaped beam or an I-shaped beam, and is fixed with the vehicle beam by bolts or welding; the design and manufacturing difficulty of the fixing piece can be reduced while the structural strength of the fixing piece is ensured.

Preferably, the body height of the battery pack is determined by the installation height of the battery pack and the range of the ground clearance.

Preferably, each section of the vehicle beam comprises two longitudinal beams which are arranged at intervals along the width direction of the electric vehicle, and the two longitudinal beams are connected through a cross beam.

Preferably, a first locking mechanism is arranged on the vehicle beam, the battery pack is provided with a second locking mechanism matched with the first locking mechanism, the battery pack is moved between a locking position and an unlocking position along the horizontal direction and/or the vertical direction, and when the battery pack is located at the locking position, the first locking mechanism is matched with the second locking mechanism so as to lock the battery pack on the vehicle beam. In the scheme, a first locking mechanism is arranged on a vehicle beam, a second locking mechanism is arranged on a battery pack, and unlocking or locking is performed by utilizing the movement of a battery pack in a horizontal or vertical direction; in the arrangement mode, the position conversion of unlocking and locking of the battery pack is completed in the horizontal direction, and compared with the mode of locking in the vertical direction, the requirement of the two locking mechanisms on the vertical height can be reduced.

Preferably, the vehicle beam comprises a beam body and a mounting bracket, the mounting bracket is fixedly connected with the beam body, the first locking mechanism is arranged on the mounting bracket, and the battery pack is detachably mounted on the mounting bracket.

In the scheme, the second locking mechanism is arranged on the mounting bracket, and the mounting bracket is fixed with the beam body; the second locking mechanisms which are horizontally arranged in rows or vertically arranged in columns can be arranged on the mounting bracket in the mode, and the structural strength of the vehicle beam cannot be influenced due to the fact that the number of the second locking mechanisms is too large.

Preferably, the first locking mechanism and the second locking mechanism are matched through at least one of a hanging locking mode, a bolt locking mode, an expanding bead locking mode and a T-shaped rotary locking mode. In this scheme, the structural style of first locking mechanism and second locking mechanism can adopt one or more among the multiple mechanism forms, and the roof beam is high, width and the different circumstances of size in the different models of adaptation of being convenient for improves the suitability of locking mechanism.

Preferably, the first locking mechanism comprises a locking piece, and the second locking mechanism comprises a lock seat; or, the first locking mechanism comprises a lock seat, and the second locking mechanism comprises a locking piece.

Preferably, the lock seat is provided with a lock groove extending along the moving direction of the battery pack, and the lock seat further comprises a lock tongue which can movably extend into the lock groove; the second locking mechanism is a locking shaft; when the battery pack is located at the locking position, the lock tongue locks the lock shaft in the lock groove. In this scheme, first locking mechanism adopts the lock seat, and the second locking mechanism adopts the lock axle structure to the lock seat includes the locked groove and can remove the spring bolt that stretches into the locked groove, utilizes the cooperation of spring bolt and locked groove to be convenient for realize locking or unblock of lock axle and lock seat.

Preferably, a first connector is arranged at the top or the side part of the battery pack, and a second connector matched with the first connector is arranged on the electric vehicle; the first connector is connected with the second connector to achieve electrical connection and/or liquid-cooled connection between the battery pack and the electric vehicle. In this scheme, set up first connector at the top or the lateral part of battery package, set up the second connector on the vehicle, be convenient for realize the electricity between battery package and the electric vehicle and be connected with the liquid way. When the first connector is provided at the side of the battery pack, it is convenient to synchronize the process of moving the battery pack in the width or length direction of the vehicle to lock or unlock the battery pack.

Preferably, the electric vehicle includes a tractor and a trailer connected, the tractor having a first beam and the trailer having a second beam.

The invention also provides a power conversion method of the electric vehicle, which is applied to the electric vehicle and comprises the following steps:

controlling the power conversion equipment to move to a preset position;

controlling the battery replacement equipment to detach a battery replacement pack on the vehicle beam;

and/or controlling the power exchanging device to mount a power exchanging battery pack to the vehicle beam.

In the scheme, when the electric vehicle is subjected to power conversion, the power conversion equipment is controlled to move to a preset position corresponding to a battery pack to be converted on a plurality of sections of vehicle beams of the electric vehicle, and then corresponding power conversion operation is performed, so that power conversion control of the electric vehicle with the plurality of sections of vehicle beams and the scattered installation of the battery packs is realized.

Preferably, at least two sections of the multi-section vehicle beams of the electric vehicle are provided with a battery replacing pack, and before the step of controlling the battery replacing device to move to the preset position, the method further comprises:

controlling the power conversion equipment to move to a vehicle beam where a power conversion battery pack to be subjected to power conversion is installed;

or waiting for the electric vehicle to move to a power conversion position, so that the power conversion equipment is positioned at a vehicle beam where a power conversion battery pack to be subjected to power conversion is installed.

According to the scheme, the battery pack can be aligned with the battery pack to be replaced by controlling the movement of the battery replacing equipment or the movement of the electric vehicle, so that the disassembly and replacement efficiency of the battery pack to be replaced is improved.

Preferably, the number of the battery replacing devices is multiple, and the step of controlling the battery replacing devices to move to the preset position includes:

and controlling the plurality of battery replacement devices to move to preset positions corresponding to the multi-section vehicle beams respectively.

Through adopting a plurality of battery replacement equipment in this scheme, can operate the battery package that trades of different roof beams departments simultaneously, effectively improve electric vehicle's the efficiency of trading.

The invention has the positive progress effects that:

according to the invention, the battery packs are arranged on at least two sections of vehicle beams, wherein at least one battery pack is a battery pack for battery replacement, so that the battery pack for battery replacement can be conveniently arranged according to the requirement, a power source can be rapidly provided for a vehicle from the outside, and the characteristics of the vehicle with multiple sections of vehicle beams can be fully utilized to finish the scattered installation of the battery packs; can avoid the volume weight of single battery package too big to lead to trading the electric difficulty, reduce the bearing requirement to the locking piece to the battery package of dispersion installation department in the roof beam can balance the load of roof beam better, reduces the influence to vehicle stability, improves the space utilization space of battery package installation, and when one of them battery package damages, the normal operating of electric vehicle has been guaranteed to the existence of other battery packages.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:

fig. 1 is a perspective view illustrating a case where a plurality of battery packs are arranged in a vehicle width direction in an embodiment of the present invention.

Fig. 2 is a plan view illustrating a plurality of battery packs arranged in a vehicle width direction according to an embodiment of the present invention.

Fig. 3 is a front view illustrating a case where a plurality of battery packs are arranged in the vehicle width direction in the embodiment of the invention.

Fig. 4 is a schematic view of the view B-B of fig. 3.

Fig. 5 is a schematic perspective view of the mounting bracket of fig. 1.

Fig. 6 is a front view illustrating a case where a plurality of battery packs are arranged in the longitudinal direction of the vehicle in the embodiment of the present invention.

Fig. 7 is a perspective view illustrating a case where a plurality of battery packs are arranged in the longitudinal direction of a vehicle in accordance with an embodiment of the present invention.

Fig. 8 is a plan view illustrating a plurality of battery packs arranged in the vehicle width direction in the embodiment of the invention.

Fig. 9 is a schematic view in the direction A-A of fig. 6.

FIG. 10 is an enlarged schematic view of the portion C of FIG. 7;

FIG. 11 is a schematic view of a lock base according to an embodiment of the present invention;

fig. 12 is a schematic workflow diagram of a power conversion method according to an embodiment of the invention.

Reference numerals illustrate: 1. a headstock; 2. a first battery pack; 3. a first vehicle beam; 4. a trailer hitch assembly; 5. a second vehicle beam; 6. a second fixing member; 601. a connecting plate; 7. a first fixing member; 701. a third fixing member; 8. a second battery pack; 9. a first bracket body; 12. a stiffening beam; 13. a first cross beam; 14. a second cross beam; 15. a lock base; 151. a bolt; 152. a locking groove; 16. a fourth fixing member; 17. a second bracket body; 1701. diagonal bracing; 1702. a horizontal bracket.

Detailed Description

In order to more clearly illustrate the general inventive concept, a detailed description is given below by way of example with reference to the accompanying drawings.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited to the specific embodiments disclosed below.

In addition, in the description of the present application, it should be understood that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Example 1

As shown in fig. 1-3 and fig. 6-8, the embodiment discloses an electric vehicle, which comprises a plurality of sections of vehicle beams sequentially arranged along the length direction of the vehicle, wherein at least two sections of vehicle beams in the plurality of sections of vehicle beams are provided with battery packs, and at least one battery pack is a battery replacement pack detachably connected with the vehicle beams.

Referring to fig. 3 or 6, the present embodiment provides an electric vehicle having two sections of vehicle beams, in which a first vehicle beam 3 is mounted at a vehicle head 1 of the electric vehicle, a second vehicle beam 5 is mounted at a vehicle body that is driven by a hitch at the rear of the vehicle head 1, and battery packs are detachably mounted on each section of vehicle beam. In other configurations, the electric vehicle may have other numbers of beams, such as three or four beams along the length of the vehicle, and may be configured according to the desired operating conditions of the electric vehicle. In an actual use scenario, for example, a tractor and a trailer have two sections of separated beams; there is also a beam arranged separately between the trailer head 1 and the trailer.

It should be noted that the above-mentioned vehicle beams are arranged in the longitudinal direction, and the vehicle beams are understood to be integral structures formed by combining longitudinal beams and cross beams at the chassis of the vehicle. The multi-section vehicle beams are understood to mean that the vehicle beams are distributed and arranged, are not integrally manufactured and formed, and are not fixedly connected in space to form an integral structure.

The multi-section vehicle beams are arranged along the length direction of the vehicle, so that different improvements are conveniently made on the shape, the size and the height of the vehicle beams according to actual use working conditions and requirements, and further the support requirements of different sections in the electric vehicle are met; meanwhile, the plurality of car beams which are arranged in a segmented mode can be manufactured respectively, and manufacturing difficulty of the car beams is reduced conveniently.

It is known that, when the multi-section beams are separately arranged and manufactured, in order to meet the form requirement of the electric vehicle, as shown in fig. 1, the two sections of beams are connected with each other through the trailer connection assembly 4, for example, a trailer seat and a trailer axle are respectively installed on the tractor and the trailer, and the specific connection manner thereof belongs to the prior art and is not repeated.

When the battery pack is intensively installed at a certain beam position of the electric vehicle, if the battery pack is of a whole pack structure, the single weight level of the battery pack is larger, and the stress of the beam is larger. Even if a sub-packaged battery pack is installed at a single vehicle beam, the problem of overweight of the battery pack cannot be solved; and a single location of the battery pack or a single battery pack being damaged may cause the entire battery pack portion to power the electric vehicle.

In the scheme, the battery packs are arranged on at least two sections of vehicle beams, so that the characteristics of the vehicle with multiple sections of vehicle beams can be fully utilized, and the scattered installation of the battery packs can be completed; on one hand, the load distribution of the battery packs born by the chassis of the vehicle is uniform, and on the other hand, the battery packs are respectively arranged at the vehicle beams of different sections, so that the risk of simultaneous faults of a plurality of battery packs can be reduced, and the probability of influencing other battery packs due to faults of a single battery pack is reduced. In addition, at least one battery pack in the scheme is a battery pack for replacing electricity, so that the battery pack for replacing electricity can be conveniently installed according to the requirement, and a power source is rapidly provided for a vehicle from the outside.

As a preferred embodiment, one or more battery packs are mounted on a section of the vehicle beam, and the plurality of battery packs are arranged along the width direction and/or the length direction of the electric vehicle. As shown in fig. 1 to 3, schematic diagrams of a plurality of battery packs arranged in the width direction of the vehicle beam are given; as shown in fig. 6-8, schematic diagrams of a plurality of battery packs arranged along the length of the vehicle beam are provided. For convenience of description, the battery packs at the different sections of the vehicle beam are distinguished by the first and second, etc., for example, when the battery packs are arranged in the vehicle width direction, the battery pack close to the vehicle head 1 is the first battery pack 22, and the battery pack far from the vehicle head 1 is the second battery pack 8.

As a preferred embodiment, the battery pack is provided at the side and/or lower portion of the vehicle beam. In the scheme, the battery pack is arranged at the side part and/or the lower part of the vehicle beam, so that the mounting position of the battery pack can be conveniently set according to the shape and the size of the vehicle beam and the height of the vehicle beam; when the battery pack is mounted on the side part of the vehicle beam, the limit of the structure of the vehicle beam on the mounting height of the battery pack can be avoided; when the battery package is installed in the lower part of roof beam, can effectively utilize the space of roof beam below, the load that the roof beam bore simultaneously is vertical down, is difficult for causing the upset of vehicle. When the battery packs are mounted at the side and lower portions of the vehicle beam, respectively, the maximization of the vehicle beam space utilization can be achieved.

As a preferred embodiment, the heights of the plurality of sections of the vehicle beams are different, and the heights of the bottom surfaces of the battery packs mounted on the plurality of sections of the vehicle beams are the same or different. In the scheme, when the heights of the plurality of sections of vehicle beams are different, vehicles with the plurality of sections of vehicle beams such as a trailer or a trailer are conveniently formed in a matched mode; in this kind of setting mode, the two sections car roof beams of difference in height can overlap joint each other in vertical, and then accomplish the connection of multistage roof beam body. In the scheme, when the heights of the multi-section vehicle beams are different, if the mounting modes of the battery packs and the vehicle beams and the heights of the body of the battery packs are the same, the condition that the heights of the bottom surfaces of the battery packs are different can occur, and then the adaptation difficulty of the battery replacement equipment is increased when the battery replacement of the electric vehicle is disassembled and replaced; in this scheme, when multistage roof beam highly is different, still keep the bottom surface height of battery package the same, can effectively avoid the inconsistent problem that produces of battery package bottom surface height.

As a preferred embodiment, in order to keep the heights of the bottom surfaces of the battery packs mounted on the multi-section vehicle beams identical when the heights of the multi-section vehicle beams are different, the heights of the bodies of the battery packs mounted on the multi-section vehicle beams are different; under the condition of different heights of the vehicle beams, the battery packs with different heights of the body are installed at the vehicle beams with different heights, and the influence of the heights of the vehicle beams on the heights of the bottom surfaces of the battery packs is compensated by utilizing the heights of the battery packs.

As another preferred embodiment, in order to keep the heights of the bottom surfaces of the battery packs mounted on the multi-section vehicle beams identical when the heights of the multi-section vehicle beams are different, the heights of the bodies of the battery packs mounted on the multi-section vehicle beams are identical, and at least one battery pack is mounted to the vehicle beams through a mounting bracket so that the mounting heights of the battery packs on the multi-section vehicle beams are identical; in this scheme, at multistage roof beam difference in height, and under the circumstances that the battery package body is high the same, compensate the installation height of battery package through the installing support, and then compensate the influence of roof beam height to battery package bottom surface height.

Specifically, when the mounting brackets are adopted to keep the heights of the bottom surfaces of the battery packs mounted on the multi-section vehicle beams to be the same when the heights of the multi-section vehicle beams are different, a first mounting bracket is arranged on the vehicle beam with higher height in the multi-section vehicle beam, and the first mounting bracket extends downwards relative to the vehicle beam; and/or a second mounting bracket is arranged on the vehicle beam with lower height in the multi-section vehicle beam, and the second mounting bracket extends upwards relative to the vehicle beam. The arrangement mode makes up the situation that the heights of the multi-section vehicle beams are different by utilizing the vertical extension of the first bracket and the second bracket; the first mounting bracket and the second mounting bracket are selectively used, so that the battery pack directly mounted at the vehicle beam in the scheme can be hung at a relatively low height position or can be mounted at a relatively high position; the limit on the installation position of the battery pack is reduced; when the height of the battery pack body and the height values of the multi-section beam body are unchanged, the mode can be used for conveniently adjusting the bottom surface height of the battery pack. Specifically, the "first" and "second" in the first mounting bracket and the second mounting bracket herein are only used to distinguish the positions where the mounting brackets are located, and are not limited to the same or different sizes and structures of the first mounting bracket and the second mounting bracket.

As another preferred embodiment, in order to keep the heights of the bottom surfaces of the battery packs mounted on the multi-section vehicle beams identical when the heights of the multi-section vehicle beams are different, the battery packs are mounted at the bottoms of the vehicle beams with higher heights in the multi-section vehicle beams, and the battery packs are mounted at the side parts of the vehicle beams with lower heights in the multi-section vehicle beams. In the scheme, part of battery packs are arranged at the bottom of a higher vehicle beam at different heights of a plurality of sections of vehicle beams, and the other part of battery packs are arranged at the side part of a vehicle with lower height, so that the arrangement mode utilizes the limit effect of the thickness of the vehicle beam on the installation position of the battery packs; the bottom surface height of the battery pack at the position of the higher vehicle beam is reduced in space, the bottom surface height of the battery pack at the position of the lower vehicle beam is improved, the effect that the ground heights of the battery packs at the positions of the beam bodies with different heights are the same in multiple sections is achieved, and the influence of the difference of the heights of the vehicle beams on the bottom surface height of the battery pack is avoided.

In this embodiment, the body height of the battery pack is determined by the installation height of the battery pack and the range of the ground clearance.

In this embodiment, each section of the vehicle beam includes two longitudinal beams arranged at intervals along the width direction of the electric vehicle, and the two longitudinal beams are connected through a cross beam. As shown in fig. 4, the two longitudinal beams are connected through the first cross beam 13 and the second cross beam 14, and the thickness of the cross beam in the vertical direction is smaller than that of the longitudinal beam; the first 13 and the second 14 cross members, which are at different heights in the vertical direction, facilitate a stable connection of the two stringers.

As a preferred embodiment, the electric vehicle comprises a tractor and a trailer connected, the tractor having a first beam 3 and the trailer having a second beam 5.

Example 2

Compared with embodiment 1, this embodiment also discloses an electric vehicle, the same structure of which is provided as:

the electric vehicle comprises a plurality of sections of vehicle beams which are sequentially arranged along the length direction of the vehicle, wherein battery packs are arranged on at least two sections of vehicle beams in the plurality of sections of vehicle beams, and at least one battery pack is a battery replacement pack which is detachably connected with the vehicle beams. As a preferred embodiment, one or more battery packs are mounted on a section of the vehicle beam, and the plurality of battery packs are arranged along the width direction and/or the length direction of the electric vehicle. As a preferred embodiment, the battery pack is provided at the side and/or lower portion of the vehicle beam.

Regarding the same parts of embodiment 1 and embodiment 2, the present embodiment is not analyzed, and the first embodiment is referred to.

The difference is that: in this embodiment, the widths of the plurality of pieces of vehicle beams are different in the width direction of the electric vehicle, and the outer widths of the battery packs mounted on the plurality of pieces of vehicle beams are the same or different. In the scheme, the widths of the multiple sections of vehicle beams are different, so that vehicles with multiple sections of different vehicle beams such as a trailer or a trailer can be conveniently formed in a matched mode; in the arrangement mode, each section of the vehicle beam with different widths is convenient to adapt to the chassis or the carriage part of the current vehicle so as to meet different bearing requirements. In the scheme, when the widths of the multi-section vehicle beams are different, if the installation modes of the battery packs and the vehicle beams and the widths of the body of the battery packs are the same, the situation that the distances between the outer side surfaces of the battery packs and the center of the vehicle beams are different can occur, and then the adapting difficulty of the battery replacing equipment is increased when the battery replacing equipment of the electric vehicle is disassembled and replaced; in this scheme, when multistage roof beam highly is different, still keep the outside width of battery package the same, when utilizing one set of battery replacement equipment to accomplish the battery package of different roof beam departments in proper order and trade the electricity, can improve the suitability of battery replacement equipment.

In one specific construction, as shown in fig. 8, the electric vehicle has two beams, the beam at the left tractor being the first beam and the beam at the right trailer being the second beam, the width of the first beam being less than the width of the second beam, but the outside width of the battery pack remains the same when depicted in the orientation shown in fig. 8.

As a preferred embodiment, in the present solution, under the condition that the widths of the vehicle beams are different, the widths of the body of the battery packs mounted on the multi-section vehicle beam are different; the influence of the width of the vehicle beam on the position of the outer side surface of the battery pack and the position of the center of the battery pack is compensated by utilizing the width of the battery pack body; so as to reduce the adapting difficulty of the power exchanging equipment.

As another preferred embodiment, in this aspect, under the condition that the widths of the vehicle beams are different, the widths of the body of the battery packs mounted on the multi-section vehicle beam are the same, and at least one battery pack is mounted to the vehicle beam through the mounting bracket, so that the mounting positions of the battery packs on the multi-section vehicle beam in the width direction of the electric vehicle are the same. The mounting bracket is used for compensating the position deviation of the outer side face of the battery pack after the battery pack is mounted and the position deviation of the center of the battery pack, so that the influence of different widths of the vehicle beam on the center position of the battery pack is compensated, and the adaptation difficulty of the battery replacement equipment is reduced.

Specifically, when the mounting bracket is adopted to compensate the influence of the width of the vehicle beam on the mounting position of the battery pack, a first mounting bracket is arranged on the vehicle beam with larger width in the multi-section vehicle beam, and the first mounting bracket extends inwards relative to the vehicle beam; and/or a second mounting bracket is arranged on the vehicle beam with smaller width in the multi-section vehicle beam, and the second mounting bracket extends outwards relative to the vehicle beam. In this arrangement; the first bracket and the second bracket are utilized to extend along the width direction to make up the situation that the widths of the plurality of sections of vehicle beams are different; the first mounting bracket and the second mounting bracket are selectively used, so that the position of the battery pack directly mounted at the vehicle beam in the scheme can be adjusted; the limit on the installation position of the battery pack is reduced; when the width of the battery pack body and the width of the multi-section beam body are unchanged, the mode can be used for conveniently adjusting the position of the outer side face and the center of the battery pack. The terms "first" and "second" in the first mounting bracket and the second mounting bracket herein are used only to distinguish the positions where the mounting brackets are located, and do not limit that the first mounting bracket and the second mounting bracket are the same or different in size and structure.

As another preferred embodiment, in this embodiment, in the case where the width of the vehicle beam is different, the battery pack is mounted on the bottom of the vehicle beam having a larger width in the multi-stage vehicle beam, and the battery pack is mounted on the side of the vehicle beam having a smaller width in the multi-stage vehicle beam. The arrangement mode utilizes the limit effect of the width of the vehicle beam on the mounting position of the battery pack; the numerical value of the outer side face of the battery pack at the position of the wider vehicle beam from the center of the vehicle is reduced in space, the distance between the outer side face of the battery pack at the position of the smaller vehicle beam and the center of the vehicle is increased, the deviation of the distance between the outer side face of the battery pack at the position of the different vehicle beams and the center of the vehicle and the deviation of the position of the center point of the battery pack are made up, and the difficulty of battery pack adaptation of the battery exchange equipment at the position of the different vehicle beams is reduced.

Example 3

The present embodiment aims to provide an electric vehicle having a mounting bracket therein, which can be selectively applied to embodiments 1, 2 and 3, and which can be either a first mounting bracket or a second mounting bracket in embodiment 1 or 2.

Specifically, the mounting bracket comprises a bracket body and a fixing piece; the support body passes through mounting and roof beam fixed connection, and the battery package is installed on the support body, and the support body of connecting on the multistage roof beam is the same. Under the condition that the structure of the bracket body is unchanged, the position of the bracket body relative to the center of the vehicle can be adjusted by changing the size of the fixing piece, so that the installation position of the battery pack can be adjusted; under the condition of improving the suitability of the mounting bracket, the universality of the mounting bracket can be improved as much as possible, and the design and manufacturing difficulty of the mounting bracket can be reduced.

As a preferred embodiment, the fixing member is a C-beam or an i-beam; the fixing piece is fixed with the vehicle beam through bolts or welding. In the scheme, the fixing piece adopts a common C-shaped beam or an I-shaped beam, and is fixed with the vehicle beam by bolts or welding; the design and manufacturing difficulty of the fixing piece can be reduced while the structural strength of the fixing piece is ensured.

As shown in fig. 4 and 5, there is provided an arrangement of the mounting brackets when the battery pack is hung on the vehicle Liang Cebu in the vehicle width direction. Specifically, the fixing pieces comprise a first fixing piece 7 and a second fixing piece 6, the first fixing piece 7 is a vertical beam, the vertical beam is fixed on the inner side surface of a longitudinal beam in the vehicle beam, the second fixing piece 6 is connected to the lower part of the first fixing piece 7, the second fixing piece 6 is a vertical plate, and the upper end of the vertical plate is attached and fixed with the lower end of the vertical beam; the upper end and the lower end of the vertical plate are also provided with bent horizontal wing parts, and the horizontal wing parts at the upper end can be attached to the lower surface of the longitudinal beam in the vehicle beam. When the longitudinal beam of the car beam is an I-shaped beam, in order to increase the connection strength of the vertical beam and the I-shaped beam, a third fixing piece 701 is arranged between the I-shaped beam and the vertical beam, and the third fixing piece 701 is respectively fixed with the I-shaped beam and the vertical beam. In order to further strengthen the mounting bracket, a reinforcing beam 12 is fixed between opposite sides of the two vertical plates, specifically, connecting plates 601 are fixedly arranged at opposite sides of the two vertical plates respectively, and ends of the reinforcing beam 12 are fixed with the connecting plates 601. For convenience of distinction, in fig. 4 and 5, the bracket body is a first bracket body 9, where the first bracket body 9 includes a horizontal portion and a vertical portion, the horizontal portion and the vertical portion form a right angle structure, and a corresponding first battery pack 22 or second battery pack 8 is installed at the first bracket body 9.

As shown in fig. 7, 9 and 10, there is provided an arrangement of the mounting brackets when the battery pack is hung on the lower portion of the vehicle beam in the longitudinal direction of the vehicle beam. Specifically, the fixing member is a fourth fixing member 16 shown in fig. 9, and it can be seen that the fourth fixing member 16 herein has a C-shaped beam structure. The upper part of the fourth fixing member 16 is fixed to the side member in the vehicle beam, the lower part of the first fixing member 7 extends downward a distance with respect to the vehicle beam, and the lower part of the fourth fixing member 16 is fixed to the second bracket body 17. The second bracket body here includes a diagonal brace 1701, where the diagonal brace 1701 has a vertical outer side surface, and the outer side surface is fixed by being attached to the outer side surface of the first fixing member 7, and the bottom surface of the diagonal brace 1701 is fixed to the horizontal bracket 1702, and a corresponding battery pack is hung below the horizontal bracket 1702.

Example 4

The present embodiment aims to provide an electric vehicle having a first locking mechanism provided on a vehicle body and a second locking mechanism provided on a battery pack, which can be applied to any one of embodiments 1, 1 or 3.

Specifically, be equipped with first locking mechanism on the roof beam, the battery package be equipped with first locking mechanism complex second locking mechanism, change electric battery package and follow horizontal direction and/or vertical direction and remove between locking position and unblock position, when changing electric battery package and being located locking position, first locking mechanism cooperatees with the second locking mechanism in order to lock the battery package of changing electric on the roof beam. In the scheme, a first locking mechanism is arranged on a vehicle beam, a second locking mechanism is arranged on a battery pack, and unlocking or locking is performed by utilizing the movement of a battery pack in a horizontal or vertical direction; in the arrangement mode, the position conversion of unlocking and locking of the battery pack is completed in the horizontal direction, and compared with the mode of locking in the vertical direction, the requirement of the two locking mechanisms on the vertical height can be reduced.

As a preferred embodiment, the vehicle beam comprises a beam body and a mounting bracket, wherein the mounting bracket is fixedly connected with the beam body, the first locking mechanism is arranged on the mounting bracket, and the battery pack for replacing the battery pack is detachably arranged on the mounting bracket. The mounting bracket herein may be any of the mounting brackets of embodiments 1, 2 or 3.

In the scheme, a first locking mechanism is arranged on a mounting bracket, and the mounting bracket is fixed with a beam body; the second locking mechanisms which are horizontally arranged in rows or vertically arranged in columns can be arranged on the mounting bracket in the mode, and the structural strength of the vehicle beam cannot be influenced due to the fact that the number of the second locking mechanisms is too large.

Specifically, the first locking mechanism and the second locking mechanism are matched through at least one of a hanging locking mode, a bolt locking mode, an expanding bead locking mode and a T-shaped rotary locking mode. The structural forms of the first locking mechanism and the second locking mechanism can adopt one or more of various mechanism forms, so that the adaptation of the conditions of different heights, widths and sizes of the beams in different models is facilitated, and the suitability of the locking mechanism is improved.

As a preferred embodiment, the first locking mechanism includes a locking member, and the second locking mechanism includes a lock base; or the first locking mechanism comprises a lock seat and the second locking mechanism comprises a locking piece.

When the battery pack in the vehicle is hung on the vehicle Liang Cebu in the width direction of the vehicle, as shown in fig. 5, the lock seat 15 at this time is installed at the outer side surface of the vertical plate, and the lock shaft is installed at the side surface of the first bracket body 9 close to the vertical plate; in other structural forms, the lock shaft can be arranged at the outer side surface of the vertical plate, and the lock seat 15 is arranged at the side surface of the first bracket body 9, which is close to the vertical plate.

Preferably, the lock base 15 is provided with a lock groove 152 extending along the moving direction of the battery pack (i.e. along the length direction or the width direction of the electric vehicle), and the lock base further comprises a lock tongue 151 which can movably extend into the lock groove; the second locking mechanism is a locking shaft arranged on the battery pack; when the battery pack is in the locking position, the lock tongue 151 locks the lock shaft in the lock groove 152. In this scheme, first locking mechanism adopts the lock seat, and the second locking mechanism adopts the lock axle structure to the lock seat includes the locked groove and can remove the spring bolt that stretches into the locked groove, utilizes the cooperation of spring bolt and locked groove to be convenient for realize locking or unblock of lock axle and lock seat.

Preferably, the top or the side part of the battery pack is provided with a first connector, and the electric vehicle is provided with a second connector matched with the first connector; the first connector is connected with the second connector to realize electric connection and/or liquid cooling connection between the battery pack and the electric vehicle. In this scheme, set up first connector at the top or the lateral part of battery package, set up the second connector on the vehicle, be convenient for realize the electricity between battery package and the electric vehicle and be connected with the liquid way. When the first connector is provided at the side of the battery pack, it is convenient to synchronize the process of moving the battery pack in the width or length direction of the vehicle to lock or unlock the battery pack.

Example 5

As shown in fig. 12, the present embodiment also provides a power conversion method for an electric vehicle, which is applied to the electric vehicle of any one or more of the above embodiments 1 to 4, and includes:

controlling the power conversion equipment to move to a preset position;

the battery replacement device is controlled to detach the battery replacement pack on the vehicle beam;

and/or controlling the power exchanging device to mount the power exchanging battery pack to the vehicle beam.

Preferably, at least two sections of vehicle beams of the multi-section vehicle are provided with battery packs for replacing electricity, and before the step of controlling the battery replacement equipment to move to the preset position, the method further comprises the following steps:

or waiting for the electric vehicle to move to the power change position, so that the power change equipment is positioned at the vehicle beam where the power change battery pack to be subjected to power change is installed.

In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see a section of the description of method embodiments.

The foregoing is merely exemplary of the present invention and is not intended to limit the present invention. Various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are to be included in the scope of the claims of the present invention.

Claims

1. The electric vehicle is characterized by comprising a plurality of sections of vehicle beams which are sequentially arranged along the length direction of the vehicle, wherein battery packs are arranged on at least two sections of vehicle beams in the plurality of sections of vehicle beams, and at least one battery pack is a battery replacement pack which is detachably connected with the vehicle beams.

2. The electric vehicle of claim 1, characterized in that one or more battery packs are mounted on a length of the vehicle beam, the plurality of battery packs being arranged along the width and/or length of the electric vehicle.

3. The electric vehicle of claim 1, characterized in that the battery pack is provided at a side portion and/or a lower portion of the vehicle body.

4. The electric vehicle of claim 1, characterized in that the heights of the plurality of segments are different, and the heights of the bottom surfaces of the battery packs mounted on the plurality of segments are the same or different.

5. The electric vehicle of claim 4, characterized in that the body heights of the battery packs mounted on the multi-segment vehicle beam are different;

or the body heights of the battery packs mounted on the multi-section vehicle beam are the same, and at least one battery pack is mounted to the vehicle beam through a mounting bracket, so that the mounting heights of the battery packs on the multi-section vehicle beam are the same;

6. The electric vehicle of claim 5, characterized in that a higher one of the plurality of vehicle beams is provided with a first mounting bracket extending downwardly relative to the vehicle beam;

7. The electric vehicle of claim 1, characterized in that the widths of the plurality of segments of the vehicle beam are different in the width direction of the electric vehicle, and the outer side widths of the battery packs mounted on the plurality of segments of the vehicle beam are the same or different.

8. The electric vehicle of claim 7, characterized in that the body widths of the battery packs mounted on the multi-segment roof rail are different;

or the body widths of the battery packs mounted on the multi-section vehicle beam are the same, and at least one battery pack is mounted to the vehicle beam through a mounting bracket, so that the mounting positions of the battery packs on the multi-section vehicle beam in the width direction of the electric vehicle are the same;

or, the battery pack is arranged at the bottom of the vehicle beam with larger width in the multi-section vehicle beam, and the battery pack is arranged at the side part of the vehicle beam with smaller width in the multi-section vehicle beam.

9. The electric vehicle of claim 8, characterized in that a first mounting bracket is provided on a wider one of the plurality of vehicle beams, the first mounting bracket extending inwardly relative to the vehicle beam;

10. The electric vehicle of any of claims 4-9, characterized in that the mounting bracket includes a bracket body and a mount; the support body is through mounting with roof beam fixed connection, the battery package install in on the support body, multistage roof beam is last to be connected the support body is the same.

11. The electric vehicle of claim 10, characterized in that the mount is a C-beam or an i-beam; the fixing piece is fixed with the vehicle beam through bolts or welding.

12. The electric vehicle of claim 1, characterized in that the body height of the battery pack is determined by the mounting height of the battery pack and the ground clearance range.

13. The electric vehicle of claim 1, wherein each of the vehicle beams includes two longitudinal beams disposed at intervals in the width direction of the electric vehicle, the two longitudinal beams being connected by a cross member.

14. The electric vehicle of claim 1, characterized in that the vehicle beam is provided with a first locking mechanism, the battery pack is provided with a second locking mechanism matched with the first locking mechanism, the battery pack is moved between a locking position and an unlocking position along the horizontal direction and/or the vertical direction, and when the battery pack is located at the locking position, the first locking mechanism is matched with the second locking mechanism to lock the battery pack on the vehicle beam.

15. The electric vehicle of claim 14, characterized in that the vehicle beam includes a beam body and a mounting bracket fixedly connected to the beam body, the first locking mechanism is disposed on the mounting bracket, and the battery pack is detachably mounted to the mounting bracket.

16. The electric vehicle of claim 14, characterized in that the first locking mechanism and the second locking mechanism cooperate by at least one of a hitch lock, a bolt lock, a bead lock, and a T-turn lock.

17. The electric vehicle of claim 14, characterized in that the first locking mechanism includes a locking member and the second locking mechanism includes a lock base;

or, the first locking mechanism comprises a lock seat, and the second locking mechanism comprises a locking piece.

18. The electric vehicle of claim 17, characterized in that: the lock seat is provided with a lock groove extending along the moving direction of the battery pack, and the lock seat also comprises a lock tongue which can movably extend into the lock groove; the second locking mechanism is a locking shaft; when the battery pack is located at the locking position, the lock tongue locks the lock shaft in the lock groove.

19. An electric vehicle as claimed in claim 1, characterized in that: a first connector is arranged at the top or the side part of the battery pack, and a second connector matched with the first connector is arranged on the electric vehicle; the first connector is connected with the second connector to achieve electrical connection and/or liquid-cooled connection between the battery pack and the electric vehicle.

20. The electric vehicle of claim 1, characterized in that the electric vehicle comprises a tractor and a trailer connected, the tractor having a first beam at the tractor and a second beam at the trailer.

21. A power conversion method of an electric vehicle, applied to the electric vehicle according to any one of claims 1 to 20, characterized by comprising:

controlling the power conversion equipment to move to a preset position;

22. The power conversion method of claim 21, wherein at least two of the plurality of segments of the electric vehicle are provided with a battery pack for converting power, and wherein prior to the step of controlling the power conversion apparatus to move to the predetermined position, the method further comprises:

23. The power conversion method according to claim 22, wherein the number of the power conversion devices is plural, and the step of controlling the power conversion devices to move to the preset positions includes: