A battery box assembly based on a non-foundation chassis battery replacement and a commercial vehicle

Abstract

The present application relates to the technical field of vehicle battery replacement, in particular to a battery box assembly based on pit-free chassis battery replacement and a commercial vehicle. The battery box assembly comprises a frame assembly, a plurality of first support beams and a plurality of second support beams are distributed in a grid shape; the first support beams and the second support beams are perpendicular to each other and detachably connected; two bottom support beams are parallel and spaced apart; the bottom support beams are parallel to the second support beams; the two sides of the bottom support beams are detachably connected with the second support beams and the girder assembly of the vehicle respectively. In the first battery assembly, the first battery boxes are staggered with the first support beams. In the second battery assembly, the second battery boxes are staggered with the second support beams; the second battery boxes are located above the first battery boxes; the second battery boxes are spaced apart to form a passing channel; the bottom support beams and the girder assembly are located in the corresponding passing channels. In this way, the problem of how to realize the chassis battery replacement of new energy vehicles in a pit-free battery replacement station is solved.

Description

Technical Field

[0001] This invention relates to the field of vehicle battery swapping technology, and more specifically, to a battery pack assembly based on a pitless chassis for battery swapping and a commercial vehicle. Background Technology

[0002] Currently, new energy vehicles primarily rely on electric power, and their energy replenishment methods generally include battery swapping and charging. Battery swapping allows for separation of the vehicle and battery, solving the problem of excessively long charging times. At present, the main battery swapping methods on the market are chassis swapping, front / rear battery swapping, and side-mounted battery swapping. Chassis swapping involves removing the old battery pack from under the chassis and replacing it with a new one. Since battery swapping vehicles require frequent swapping operations, a locking mechanism driven by the swapping equipment locks or separates the battery pack from the chassis during the swapping process. Compared to the other two methods, chassis swapping is easier to implement, has a shorter battery replacement time, a high degree of automation, does not occupy vehicle space, and does not affect the overall vehicle design, making it a highly feasible solution at present.

[0003] However, the height space between the vehicle chassis and the flat ground for battery swapping is limited. Existing chassis-based battery swapping methods involve expanding the height space between the vehicle chassis and the ground by using portable ramps, tire jacks, or digging a pit at the battery swapping location at the station, and then using a battery swapping cart to swap batteries under the vehicle. These methods increase the construction cost of battery swapping stations and limit the availability of swapping sites, making it difficult to meet the needs of car owners for quick and efficient battery swapping anytime, anywhere. Summary of the Invention

[0004] To address the challenge of enabling new energy vehicles to perform chassis-based battery swapping at pitless battery swapping stations, this invention provides a battery pack assembly and a commercial vehicle based on pitless chassis-based battery swapping.

[0005] In a first aspect, the present invention provides a battery pack assembly based on a pitless chassis for battery swapping, the battery pack assembly based on a pitless chassis for battery swapping comprising:

[0006] A frame assembly includes multiple first support beams, multiple second support beams, and two bottom support beams; the multiple first support beams are parallel to each other and spaced apart; the multiple second support beams are parallel to each other and spaced apart; the first support beams and the second support beams are perpendicular to each other; the first support beams and the second support beams are detachably connected; the two bottom support beams are parallel to each other and spaced apart; the bottom support beams are parallel to the second support beams; the bottom support beams are detachably connected to the second support beams; the bottom support beams are used for detachable connection to the vehicle's main frame assembly.

[0007] A first battery assembly includes a plurality of first battery boxes; the first battery boxes are detachably connected to the frame assembly; the length direction of the first battery boxes is parallel to the first support beam; the plurality of first battery boxes and the plurality of first support beams are arranged alternately; the height direction of the first battery boxes is perpendicular to both the first support beam and the second support beam.

[0008] The second battery assembly includes multiple second battery boxes; the second battery boxes are detachably connected to the frame assembly; the length direction of the second battery boxes is parallel to the second support beam; the multiple second battery boxes and the multiple second support beams are arranged alternately; the second battery boxes are located in the height direction of the first battery box; two clearance channels are provided at intervals between the multiple second battery boxes; the clearance channels are parallel to the bottom support beam; the bottom support beam corresponds to the clearance channel; the bottom support beam is located in the corresponding clearance channel; the clearance channel is also used to accommodate the main beam assembly of the vehicle.

[0009] In some embodiments, the battery pack assembly based on a pitless chassis for battery swapping further includes an extension assembly; the extension assembly includes an extension frame and an extension element; the extension frame is detachably connected to the second support beam; a portion of the second battery pack is located within the extension frame; the two clearance channels are located on the same side of the extension frame; the extension element is detachably connected to the extension frame; the extension element is located on the side of the second battery pack away from the first battery pack.

[0010] In some embodiments, the expansion element includes at least one of a high-voltage box, a low-voltage box, a water-cooled unit, and a third battery box.

[0011] In some embodiments, the dimension of the extension element along the length direction of the second support beam is smaller than the length of the second battery box.

[0012] In some embodiments, the center of gravity of the first battery assembly is located on the side of the second battery assembly away from the center of gravity of the extension assembly.

[0013] In some embodiments, the end of the first battery assembly away from the extension assembly is flush with the end face of the frame assembly away from the extension assembly; a first receiving space is provided between the end of the first battery assembly near the extension assembly and the end face of the frame assembly near the extension assembly.

[0014] In some embodiments, the first battery assembly further includes a plurality of first wiring harnesses; the first wiring harnesses are electrically connected to the first battery box in a one-to-one correspondence; the first wiring harnesses are disposed in the first accommodating space.

[0015] In some embodiments, the length of the second battery box is greater than the length of the first battery assembly along the direction of the second support beam; one end of the second battery box is a power supply end and the other end is a fixed end; one end of the first battery assembly is flush with the fixed end, and the other end has a second accommodating space between it and the power supply end.

[0016] In some embodiments, the first accommodating space is connected to the second accommodating space; the second battery assembly further includes a plurality of second wiring harnesses; the second wiring harnesses are electrically connected to the second battery box in a one-to-one correspondence; the second wiring harnesses are inserted into the second accommodating space; and the first wiring harness is electrically connected to the second wiring harnesses.

[0017] Secondly, the present invention provides a commercial vehicle; the commercial vehicle includes the battery pack assembly based on a pitless chassis for battery swapping as described in any of the above embodiments; the commercial vehicle further includes:

[0018] The main beam assembly includes two supporting beams; each supporting beam corresponds to one of the two clearance channels in the battery box assembly; the supporting beam is located within the corresponding clearance channel; each supporting beam corresponds to one of the bottom support beams of the battery box assembly; the supporting beams and the corresponding bottom support beams are detachably connected; the first battery assembly is located below the second battery assembly.

[0019] To address the challenge of enabling battery swapping of new energy vehicles at pitless battery swapping stations, this invention offers the following advantages:

[0020] The frame assembly includes at least two layers of battery boxes, namely a first battery pack and a second battery pack. When the vehicle is loaded with the battery box assembly, the second battery pack and the vehicle's main beam assembly are at the same horizontal level. The main beam assembly is located in the gap area between the two second battery packs of the second battery pack, thereby increasing the ground clearance of the battery box assembly. Furthermore, when the battery boxes are placed, the length direction of the first battery pack is perpendicular to the length direction of the second battery pack. This allows the frame assembly to add a first support beam between adjacent first battery packs of the first battery pack. This eliminates the need to weld an additional crossbeam structure perpendicular to the vehicle's main beam assembly onto the bottom support beam to support the second battery pack. While ensuring the structural strength of the frame assembly, the bottom support beam only needs a structure parallel to the vehicle's main beam assembly, simplifying the bottom support structure, reducing the height of the frame assembly in the vehicle's height direction, and further increasing the ground clearance of the battery box assembly. This saves the height space required for installing the battery pack assembly on the vehicle. When swapping batteries, the battery pack assembly can be installed or removed simply by ensuring that the top of the second battery component is lower than the main beam assembly. The battery swapping vehicle does not need to occupy too much height space, thus avoiding the need to dig a pit for the battery swapping station and saving on the construction cost of the battery swapping station. Attached Figure Description

[0021] Figure 1 A simplified structural diagram of a commercial vehicle based on a pitless chassis battery swapping system is shown in one embodiment, wherein the protective frame of the commercial vehicle is in a locked state;

[0022] Figure 2 It shows Figure 1 The diagram shows the structure of the protective frame in the commercial vehicle in the open state.

[0023] Figure 3 A schematic diagram showing the fit between the battery box assembly and the beam assembly in an embodiment of a pitless chassis battery swapping system is provided.

[0024] Figure 4 A schematic diagram of the structure of a battery box assembly based on a pitless chassis for battery swapping is shown in one embodiment.

[0025] Figure 5 It shows Figure 4 The diagram shown is a structural schematic of the battery pack assembly without the second battery module.

[0026] Figure 6 A schematic diagram of the frame assembly of a battery box assembly based on a pitless chassis for battery swapping is shown in one embodiment.

[0027] Figure 7 It shows Figure 4 The diagram shows a side view of the battery pack assembly.

[0028] Figure label:

[0029] 10 Frame assembly; 11 First support beam; 12 Second support beam; 13 Bottom support beam; 14 First receiving space; 15 Second receiving space; 20 First battery assembly; 21 First battery box; 30 Second battery assembly; 31 Second battery box; 40 Extension assembly; 41 Extension frame; 42 Extension element; 50 Main beam assembly; 51 Supporting main beam; 60 Wheel; 70 Protective frame. Detailed Implementation

[0030] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, and are not intended to imply any limitation on the scope of the disclosure.

[0031] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments and are not intended to limit the indicated devices, elements, or components to having a specific orientation or being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientations or positional relationships; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances. In addition, the terms "installed", "set up", "equipped with", "connected", and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," etc., are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0032] In this embodiment, to reduce the height space requirements for battery swapping during the chassis battery swapping process of new energy vehicles and reduce the construction cost of battery swapping stations, this embodiment discloses a battery box assembly based on pitless chassis battery swapping. For example... Figure 1 As shown, the battery pack assembly based on a pitless chassis for battery swapping may include a frame assembly 10, a first battery assembly 20, and a second battery assembly 30. For example... Figure 6 As shown, the frame assembly 10 includes multiple first support beams 11, multiple second support beams 12, and two bottom support beams 13. The multiple first support beams 11 are parallel to each other and spaced apart. The multiple second support beams 12 are parallel to each other and spaced apart. The first support beams 11 and second support beams 12 are perpendicular to each other. The grid-like structure allows the frame assembly 10 to provide sufficient support and protection for the first battery assembly 20 and the second battery assembly 30. The first support beams 11 and second support beams 12 are detachably connected. Figure 1 As shown, two bottom support beams 13 are arranged parallel to each other and spaced apart. The bottom support beams 13 are parallel to the second support beam 12. The bottom support beams 13 and the second support beam 12 are detachably connected. The bottom support beams 13 are used for detachable connection with the vehicle's main beam. This ensures the reliability of the frame assembly 10 when it is loaded into the vehicle.

[0033] like Figure 5 As shown, the first battery assembly 20 includes a plurality of first battery boxes 21. The first battery boxes 21 are detachably connected to the frame assembly 10. The length direction of the first battery boxes 21 is parallel to the first support beams 11, that is, the length direction of the first battery boxes 21 is perpendicular to the vehicle's direction of travel. The plurality of first battery boxes 21 and the plurality of first support beams 11 are arranged in an alternating pattern, that is, the first support beams 11 are located in the interval area between two adjacent first battery boxes 21, so that the first support beams 11 can extend along the height direction of the frame assembly 10 to provide support for the second battery assembly 30. The height direction of the first battery boxes 21 is perpendicular to both the first support beams 11 and the second support beams 12.

[0034] like Figure 1 , Figure 4 As shown, the second battery assembly 30 includes multiple second battery boxes 31. The second battery boxes 31 are detachably connected to the frame assembly 10. The length direction of the second battery boxes 31 is parallel to the second support beam 12, that is, the length direction of the second battery boxes 31 is parallel to the vehicle's driving direction. The multiple second battery boxes 31 and the multiple second support beams 12 are arranged alternately. The second battery boxes 31 are located at the height of the first battery box 21, that is, the second battery boxes 31 are placed above the first battery box 21, and the side of the second battery box 31 closest to the first battery box 21 can be detachably connected to the first support beam 11, thereby providing support for the second battery box 31 through the first support beam 11. Two clearance channels are provided at intervals between the multiple second battery boxes 31. The clearance channels are parallel to the bottom support beam 13. The bottom support beam 13 corresponds to one clearance channel. The bottom support beam 13 is located within the corresponding clearance channel. The clearance channels also serve to accommodate the vehicle's main beam assembly 50. By creating a clearance passage, after the battery pack assembly is loaded into the vehicle, the second battery pack 31 is at the same horizontal level as the vehicle's main beam assembly 50, thereby increasing the ground clearance of the battery pack assembly.

[0035] With the above configuration, when the battery pack assembly is loaded, the axis of the first battery component 20 is perpendicular to the axis of the second battery component 30. This allows the frame assembly 10 to add a first support beam 11 between adjacent first battery boxes 21 of the first battery component 20. This eliminates the need to weld an additional crossbeam structure perpendicular to the vehicle's main beam assembly 50 onto the bottom support beam 13 to support the second battery component 30. While ensuring the structural strength of the frame assembly 10, the bottom support beam 13 only needs a structure parallel to the vehicle's main beam assembly 50, simplifying the bottom support structure, reducing the height of the frame assembly 10 in the vehicle's height direction, and further increasing the ground clearance of the battery pack assembly. This saves the height space required for the battery pack assembly to be installed on the vehicle, improving space utilization. During battery swapping, the battery pack assembly can be installed or removed simply by ensuring the top height of the second battery component 30 is lower than the main beam assembly 50. The battery swapping vehicle does not require a large height space, thus avoiding the need for digging a pit for the battery swapping station and saving on construction costs.

[0036] The above-mentioned detachable connection method is not limited and can be threaded connection, rivet connection, snap connection, etc., which facilitates assembly, disassembly and replacement.

[0037] In this embodiment, as Figure 1 , Figure 3 As shown, the battery pack assembly based on a pitless chassis for battery swapping may further include an extension assembly 40. The extension assembly 40 includes an extension frame 41 and an extension element 42. The extension frame 41 is detachably connected to the second support beam 12. A portion of the second battery pack 31 is located within the extension frame 41. Two clearance channels are located on the same side of the extension frame 41. The extension element 42 is detachably connected to the extension frame 41. The extension frame 41 can provide support for the extension element 42. The extension element 42 is located on the side of the second battery pack 30 away from the first battery pack 20.

[0038] Since the extension component 40 does not need to be moved under the vehicle's main beam assembly 50 during battery swapping, the top of the extension component 40 can be higher than the main beam assembly 50, thus making full use of the space on the side of the main beam assembly 50 facing the battery swapping vehicle, and will not obstruct the loading of the battery box assembly. This facilitates the addition of other structural components to the battery box assembly and improves space utilization.

[0039] In this embodiment, as Figure 3 , Figure 4 As shown, the expansion element 42 may include at least one of a high-voltage box, a low-voltage box, a water-cooled unit, and a third battery box. Functional components such as the high-voltage box, low-voltage box, and water-cooled unit can be integrated on the expansion frame 41, thereby rationally arranging the vehicle's structural components and improving space utilization. The third battery box can expand the capacity of the battery pack assembly, increasing the maximum capacity of the battery pack assembly.

[0040] In this embodiment, as Figure 2 As shown, the dimension of the extension element 42 along the length of the second support beam 12 is smaller than the length of the second battery box 31. That is, the length of the extension element 42 along the driving direction of the vehicle is smaller than the length of the second battery assembly 30 along the driving direction of the vehicle, thereby leaving installation space for the vehicle's protective frame 70.

[0041] In other embodiments, such as Figure 2 As shown, one end of the vehicle's protective frame 70 is detachably connected to the vehicle's main frame assembly 50, and the other end extends away from the main frame assembly 50. The protective frame 70 is used to protect the first battery assembly 20 and the second battery assembly 30.

[0042] In this embodiment, as Figure 4 , Figure 5 As shown, the center of gravity of the first battery pack 20 is located on the side of the second battery pack 30 away from the center of gravity of the extension component 40. By offsetting the center of gravity of the first battery pack 20 from that of the second battery pack 30, the battery pack assembly can achieve a balanced state when the extension component 40 is added to one side of the second battery pack 30. This prevents the battery pack assembly from affecting the vehicle's balance after being loaded into the vehicle, thereby ensuring vehicle driving safety.

[0043] In this embodiment, as Figure 5 As shown, the end of the first battery assembly 20 furthest from the extension assembly 40 is flush with the end face of the frame assembly 10 furthest from the extension assembly 40. A first receiving space 14 exists between the end of the first battery assembly 20 closest to the extension assembly 40 and the end face of the frame assembly 10 closest to the extension assembly 40. Thus, through a reasonable size design and placement, the center of gravity of the first battery assembly 20 is shifted to one side of the frame assembly 10, thereby balancing the weight of the extension assembly 40 and ensuring the vehicle's body balance.

[0044] In this embodiment, the first battery assembly 20 further includes a plurality of first wire harnesses. Each first wire harness is electrically connected to a corresponding first battery box 21. The first wire harnesses are threaded through the first receiving space 14. By utilizing the first receiving space 14 formed by the offset of the center of gravity of the first battery assembly 20 within the frame assembly 10 to house the first wire harnesses, the regularity of the wire harness arrangement in the first battery box 21 can be effectively improved, the space utilization rate can be increased, and the wiring can be arranged more conveniently.

[0045] In this embodiment, as Figure 4 , Figure 5As shown, the length of the second battery box 31 is greater than the length of the first battery assembly 20 along the direction of the second support beam 12, thereby increasing the battery capacity of the battery box assembly. One end of the second battery box 31 is the power supply end, and the other end is the fixed end. One end of the first battery assembly 20 is flush with the fixed end, and there is a second accommodating space 15 between the other end and the power supply end. Through the above arrangement, the influence of the offset of the center of gravity of the first battery assembly 20 is balanced by the length design of the second battery box 31 and the weight of the extension assembly 40. At the same time, the second accommodating space 15 can be used to accommodate the wiring harness arrangement of the second battery box 31, thereby improving the space utilization rate.

[0046] In this embodiment, as Figure 5 As shown, the first receiving space 14 and the second receiving space 15 are connected, facilitating wiring layout. The second battery assembly 30 also includes multiple second wiring harnesses. Each second wiring harness is electrically connected to the second battery box 31. The second wiring harnesses pass through the second receiving space 15. The first wiring harness is electrically connected to the second wiring harness. Utilizing the first receiving space 14 and the second receiving space 15 for the arrangement of the first and second wiring harnesses further improves the rationality of the wiring harness layout. Simultaneously, other expansion components 42 meeting vehicle requirements can also be arranged within the first receiving space 14 and the second receiving space 15.

[0047] In this embodiment, a commercial vehicle is disclosed, which may include the battery pack assembly based on a pitless chassis for battery swapping as described in any of the above embodiments. The commercial vehicle may also include a frame assembly 50. Figure 1 As shown, the main beam assembly 50 includes two supporting beams 51. Each supporting beam 51 corresponds one-to-one with one of the two clearance channels in the battery box assembly. The supporting beam 51 is located within its corresponding clearance channel. Each supporting beam 51 also corresponds one-to-one with the bottom support beam 13 of the battery box assembly. The supporting beam 51 and its corresponding bottom support beam 13 are detachably connected. The first battery assembly 20 is located below the second battery assembly 30. This configuration allows the battery box assembly to be securely mounted on the commercial vehicle.

[0048] In other embodiments, such as Figure 1 As shown, the commercial vehicle may also include wheels 60 and a protective frame 70. The wheels 60 are distributed on both sides of the frame assembly 50 along the direction of travel of the commercial vehicle. At least one protective frame 70 is located on the side of the battery box assembly extension 40 away from the frame assembly 50. One end of the protective frame 70 is detachably connected to the supporting frame 51. Figure 2 As shown, when the battery pack assembly needs to be loaded onto or removed from a commercial vehicle, the end of the protective frame 70 away from the support beam 51 can be controlled to flip away from the ground, so that the battery swapping vehicle can perform battery swapping according to the set program.

[0049] It should be understood that the "this embodiment" mentioned in this invention refers to the technical points described below, and multiple "this embodiments" may refer to the same embodiment or different embodiments.

[0050] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes can be made in form and detail without departing from the scope of this disclosure.

Claims

1. A battery box assembly based on a non-foundation chassis battery replacement, characterized in that, The battery box assembly based on the non-foundation chassis battery swap comprises: a frame assembly comprising a plurality of first support beams, a plurality of second support beams and two bottom support beams; the plurality of first support beams are parallel and spaced apart; the plurality of second support beams are parallel and spaced apart; the first support beams are perpendicular to the second support beams; the first support beams and the second support beams are detachably connected; the two bottom support beams are parallel and spaced apart; the bottom support beams are parallel to the second support beams; the bottom support beams and the second support beams are detachably connected; the bottom support beams are used for detachable connection with the girder assembly of the vehicle; a first battery assembly comprising a plurality of first battery boxes; the first battery boxes are detachably connected with the frame assembly; the length direction of the first battery boxes is parallel to the first support beams; the plurality of first battery boxes and the plurality of first support beams are staggered one by one; the height direction of the first battery boxes is perpendicular to the first support beams and the second support beams at the same time; a second battery assembly comprising a plurality of second battery boxes; the second battery boxes are detachably connected with the frame assembly; the length direction of the second battery boxes is parallel to the second support beams; the plurality of second battery boxes and the plurality of second support beams are staggered one by one; the second battery boxes are located in the height direction of the first battery boxes; two accommodation channels are provided between the plurality of second battery boxes; the accommodation channels are parallel to the bottom support beams; the bottom support beams correspond to the accommodation channels one by one; the bottom support beams are located in the corresponding accommodation channels; the accommodation channels are also used for accommodating the girder assembly of the vehicle; an expansion assembly comprising an expansion frame and an expansion element; the expansion frame is detachably connected with the second support beams; part of the second battery boxes are located in the expansion frame; the two accommodation channels are located on the same side of the expansion frame; the expansion element is detachably connected with the expansion frame; the expansion element is located on the side of the second battery assembly away from the first battery assembly; when the vehicle is swapped, the top of the expansion assembly is higher than the girder assembly of the vehicle, and the battery box assembly moves from the end away from the expansion assembly to below the girder assembly of the vehicle for battery swap.

2. The battery box assembly based on the non-foundation chassis battery swap of claim 1, wherein the expansion element comprises at least one of a high-voltage box, a low-voltage box, a water cooling unit and a third battery box.

3. The battery box assembly based on the non-foundation chassis battery swap of claim 1, wherein the size of the expansion element along the length direction of the second support beam is smaller than the length of the second battery box.

4. The battery box assembly based on the non-foundation chassis battery swap of claim 1, wherein the center of gravity of the first battery assembly is located on the side of the center of gravity of the second battery assembly away from the expansion assembly.

5. The battery box assembly based on the non-foundation chassis battery swap of claim 1, wherein The first battery assembly is flush with the end surface of the frame assembly away from the expansion assembly; the first battery assembly has a first accommodating space between the end surface of the frame assembly close to the expansion assembly.

6. The battery box assembly based on the pit-free base plate battery replacement according to claim 5, characterized in that, The first battery assembly further comprises a plurality of first wire harnesses; the first wire harnesses are electrically connected one by one with the first battery box; and the first wire harnesses are arranged in the first accommodating space.

7. The battery box assembly based on the pit-free base plate battery replacement according to claim 6, characterized in that, The length of the second battery box is greater than the size of the first battery assembly along the direction of the second support beam; one end of the second battery box is a power supply end, and the other end is a fixed end; one end of the first battery assembly is flush with the fixed end, and the other end has a second accommodating space to the power supply end.

8. The battery box assembly based on the pit-free base plate battery replacement according to claim 7, characterized in that, The first accommodating space and the second accommodating space are in communication; the second battery assembly further comprises a plurality of second wire harnesses; the second wire harnesses are electrically connected one by one with the second battery box; the second wire harnesses are arranged in the second accommodating space; and the first wire harnesses are electrically connected with the second wire harnesses.

9. A commercial vehicle, characterized in that, The commercial vehicle comprises: The battery box assembly based on the pit-free base plate battery replacement according to any one of claims 1-8; A girder assembly comprising two support girders; the support girders correspond to the two notching channels in the battery box assembly one by one; the support girders are located in the corresponding notching channels; the support girders correspond to the bottom support beams of the battery box assembly one by one; the support girders are detachably connected with the corresponding bottom support beams; the first battery assembly is located below the second battery assembly; and the top of the expansion assembly is higher than the girder assembly.

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