Battery box assembly based on non-foundation-pit chassis battery replacement and commercial vehicle

Abstract

The invention relates to the technical field of vehicle battery replacement, in particular to a battery box assembly based on foundation-pit-free chassis battery replacement and a commercial vehicle. According to the battery box assembly, in a frame assembly, a plurality of first supporting beams and a plurality of second supporting beams are distributed in a grid shape; the first supporting beam and the second supporting beam are perpendicular to each other and detachably connected. The two bottom joists are arranged in parallel at an interval; the bottom supporting beam is parallel to the second supporting beam; the two sides of the bottom joist are detachably connected with the second supporting beam and a girder assembly of the vehicle correspondingly. In the first battery assembly, the first battery boxes and the first supporting beams are arranged in a staggered mode. In the second battery assembly, second battery boxes and second supporting beams are arranged in a staggered manner; the second battery box is positioned above the first battery box; avoiding channels are arranged between the second battery boxes at intervals; the bottom joist and the girder assembly are both located in the corresponding receding channels. Therefore, the problem of how to realize chassis battery replacement of the new energy vehicle in the battery replacement station without the foundation pit is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle battery replacement, and in particular to a battery box assembly and a commercial vehicle based on pit-free chassis battery replacement. Background Art

[0002] At present, new energy vehicles are mainly powered by electricity, and the energy replenishment methods of new energy vehicles generally include battery replacement mode and charging mode. The battery replacement mode can realize the separation of vehicle and battery, which can solve the problem of long charging time. At this stage, the main battery replacement methods on the market are chassis battery replacement, front cabin / rear battery replacement and side panel battery replacement. Among them, chassis battery replacement refers to the method of removing the original battery pack from the lower part of the chassis and replacing it with a new battery pack. Since battery replacement vehicles need to perform battery replacement frequently, in the battery replacement process, the battery pack is locked or separated from the chassis by driving the locking mechanism through the battery replacement equipment. Compared with the other two methods, chassis battery replacement is easier to implement, takes less time to replace the battery, has a high degree of automation, does not occupy the vehicle's use space, and does not affect the overall vehicle shape. It is currently a more feasible solution.

[0003] However, the height space between the vehicle chassis and the flat ground is limited. The existing chassis battery replacement method is to expand the height space between the vehicle chassis and the ground through a portable ramp or tire jack or dig a foundation pit at the battery replacement location of the battery replacement station, and then use a battery replacement vehicle to replace the battery at the bottom of the vehicle body. The above method increases the construction cost of the battery replacement station, and there are restrictions on the battery replacement site, which makes it difficult to meet the needs of car owners for fast and efficient battery replacement anytime, anywhere. Summary of the invention

[0004] In order to solve the problem of how to realize chassis battery replacement of new energy vehicles at a battery replacement station without a pit, the present invention provides a battery box assembly and a commercial vehicle based on chassis battery replacement without a pit.

[0005] In a first aspect, the present invention provides a battery box assembly based on a pit-free chassis battery replacement, and the battery box assembly based on a pit-free chassis battery replacement includes: A frame assembly, the 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 to each other and spaced apart; the plurality of second support beams are parallel to each other and spaced apart; the first support beam and the second support beam are perpendicular to each other; the first support beam and the second support beam are detachably connected; the two bottom support beams are parallel to each other and spaced apart; the bottom support beam is parallel to the second support beam; the bottom support beam and the second support beam are detachably connected; the bottom support beam is used to be detachably connected to the vehicle's beam assembly; A first battery assembly, wherein the first battery assembly comprises a plurality of first battery boxes; the first battery boxes are detachably connected to the frame assembly; the length direction of the first battery box is parallel to the first support beam; the plurality of first battery boxes are arranged alternately with the plurality of first support beams; the height direction of the first battery box is perpendicular to both the first support beam and the second support beam; The second battery assembly comprises a plurality of 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 plurality of second battery boxes and the plurality of second support beams are arranged alternately one by one; the second battery boxes are located in the height direction of the first battery box; two make way channels are arranged between the plurality of second battery boxes; the make way channels are parallel to the bottom supporting beam; the bottom supporting beam corresponds to the make way channels one by one; the bottom supporting beam is located in the corresponding make way channel; the make way channel is also used to accommodate the beam assembly of the vehicle.

[0006] In some embodiments, the battery box assembly based on pit-free chassis battery replacement also includes an expansion component; the expansion component includes an expansion rack and an expansion element; the expansion rack is detachably connected to the second support beam; part of the second battery box is located in the expansion rack; the two make way channels are located on the same side of the expansion rack; the extension element is detachably connected to the expansion rack; the extension element is located on the side of the second battery assembly away from the first battery assembly.

[0007] In some embodiments, the extension element includes at least one of a high voltage box, a low voltage box, a water cooling unit, and a third battery box.

[0008] In some embodiments, a dimension of the extension element along a length direction of the second support beam is smaller than a length of the second battery box.

[0009] In some embodiments, the center of gravity of the first battery assembly is located on a side of the center of gravity of the second battery assembly away from the expansion assembly.

[0010] In some embodiments, an end of the first battery assembly away from the expansion assembly is flush with an end face of the frame assembly away from the expansion assembly; a first accommodating space is provided between an end of the first battery assembly close to the expansion assembly and an end face of the frame assembly close to the expansion assembly.

[0011] 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 boxes in a one-to-one correspondence; and the first wiring harnesses are arranged in the first accommodating space.

[0012] In some embodiments, the length dimension of the second battery box is greater than the dimension of the first battery assembly along the second support beam direction; 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 there is a second accommodating space between the other end and the power supply end.

[0013] In some embodiments, the first accommodating space is connected to the second accommodating space; the second battery assembly also includes multiple second wiring harnesses; the second wiring harnesses are electrically connected to the second battery boxes one by one; the second wiring harnesses are passed through the second accommodating space; the first wiring harness is electrically connected to the second wiring harness.

[0014] In a second aspect, the present invention provides a commercial vehicle; the commercial vehicle comprises a battery box assembly based on chassis battery replacement without a foundation pit as described in any one of the above embodiments; the commercial vehicle further comprises: The beam assembly includes two supporting beams; the supporting beams correspond one-to-one to the two clearance channels in the battery box assembly; the supporting beams are located in the corresponding clearance channels; the supporting beams correspond one-to-one to the bottom supporting beams of the battery box assembly; the supporting beams are detachably connected to the corresponding bottom supporting beams; the first battery assembly is located below the second battery assembly.

[0015] In order to solve the problem of how to realize chassis battery replacement of new energy vehicles at a battery replacement station without a foundation pit, the present invention has the following advantages: At least two layers of battery boxes are arranged in the frame assembly, which are the first battery assembly and the second battery assembly. When the vehicle is loaded with the battery box assembly, the second battery assembly and the vehicle's beam assembly are located at the same level, and the beam assembly is located in the interval area between the two second battery boxes of the second battery assembly, thereby raising the ground clearance of the battery box assembly. And when the battery boxes are placed, the length direction of the first battery assembly is perpendicular to the length direction of the second battery assembly, so that the frame assembly can add a first support beam between the adjacent first battery boxes of the first battery assembly, so that the bottom support beam does not need to be additionally welded with a crossbeam structure perpendicular to the vehicle's beam assembly to support the second battery assembly. While ensuring the structural strength of the frame assembly, the bottom support beam only needs to have a structure parallel to the vehicle's beam assembly, thereby achieving the purpose of simplifying the bottom support structure, reducing the height of the frame assembly in the height direction of the vehicle, and further increasing the ground clearance of the battery box assembly. This can save the height space required for installing the battery box assembly on the vehicle as a whole, so that when the vehicle is changing batteries, it is only necessary to control the top height of the second battery module of the battery box assembly to be lower than the frame assembly to install or remove the battery box assembly. The battery-changing cart does not need to occupy too much height space, thereby avoiding the need to dig a foundation pit for the battery swap station and saving the construction cost of the battery swap station. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A simplified structural schematic diagram of a commercial vehicle based on a pitless chassis battery replacement according to an embodiment is shown, wherein the protective frame of the commercial vehicle is in a locked state; Figure 2 Shows Figure 1 A schematic diagram of the structure of the protective frame in the commercial vehicle in the open state shown; Figure 3 A schematic diagram showing the coordination relationship between a battery box assembly and a beam assembly based on a pit-free chassis battery replacement in one embodiment is shown; Figure 4 A schematic structural diagram of a battery box assembly based on a pit-free chassis battery replacement according to an embodiment is shown; Figure 5 Shows Figure 4 The battery box assembly shown is a schematic diagram of the structure after omitting the second battery assembly; Figure 6 A schematic structural diagram of a frame assembly of a battery box assembly based on a pit-free chassis battery replacement according to an embodiment is shown; Figure 7 Shows Figure 4 A schematic side view of the battery box assembly is shown.

[0017] Reference numerals: 10 frame assembly; 11 first support beam; 12 second support beam; 13 bottom support beam; 14 first accommodating space; 15 second accommodating 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 beam assembly; 51 supporting beam; 60 wheel; 70 protective frame. DETAILED DESCRIPTION

[0018] 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, rather than implying any limitation on the scope of the present disclosure.

[0019] As used herein, the term "including" and its variants are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "based at least in part 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 orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like is based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate an orientation or position relationship, some of the above terms may also be used to indicate other meanings, such as the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances. In addition, the terms "install", "set", "provided with", "connected" and "connected" should be understood in a broad sense. 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 directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, 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 and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0020] In this embodiment, in order to reduce the height space requirements for battery replacement during chassis battery replacement for new energy vehicles and reduce the construction cost of battery replacement stations, this embodiment discloses a battery box assembly based on chassis battery replacement without a foundation pit. Figure 1 As shown, the battery box assembly based on the pitless chassis battery replacement may include a frame assembly 10, a first battery assembly 20, and a second battery assembly 30. Figure 6 As shown, the frame assembly 10 includes a plurality of first support beams 11, a plurality of second support beams 12 and two bottom support beams 13. The plurality of first support beams 11 are parallel to each other and spaced apart. The plurality of second support beams 12 are parallel to each other and spaced apart. The first support beams 11 and the 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 beam 11 and the second support beam 12 are detachably connected. Figure 1 As shown, two bottom support beams 13 are arranged in parallel and at intervals. The bottom support beam 13 is parallel to the second support beam 12. The bottom support beam 13 is detachably connected to the second support beam 12. The bottom support beam 13 is used to be detachably connected to the vehicle's beam, thereby ensuring the reliability of the frame assembly 10 when it is loaded into the vehicle.

[0021] like Figure 5 As shown, the first battery assembly 20 includes a plurality of first battery boxes 21. The first battery box 21 is detachably connected to the frame assembly 10. The length direction of the first battery box 21 is parallel to the first support beam 11, that is, the length direction of the first battery box 21 is perpendicular to the driving direction of the vehicle. The plurality of first battery boxes 21 and the plurality of first support beams 11 are arranged one by one in an alternating manner, that is, the first support beam 11 is arranged in the interval area between two adjacent first battery boxes 21, so that the first support beam 11 can extend along the height direction of the frame assembly 10 to provide support force for the second battery assembly 30. The height direction of the first battery box 21 is perpendicular to both the first support beam 11 and the second support beam 12.

[0022] like Figure 1 , Figure 4 As shown, the second battery assembly 30 includes a plurality of second battery boxes 31. The second battery box 31 is detachably connected to the frame assembly 10. The length direction of the second battery box 31 is parallel to the second support beam 12, that is, the length direction of the second battery box 31 is parallel to the driving direction of the vehicle. The plurality of second battery boxes 31 are staggered one by one with the plurality of second support beams 12. The second battery box 31 is located in the height direction of the first battery box 21, that is, the second battery box 31 is placed above the first battery box 21, and the side of the second battery box 31 close to the first battery box 21 can be detachably connected to the first support beam 11, so as to provide support force for the second battery box 31 through the first support beam 11. Two clearance channels are arranged between the plurality of second battery boxes 31. The clearance channels are parallel to the bottom support beam 13. The bottom support beam 13 corresponds to the clearance channels one by one. The bottom support beam 13 is located in the corresponding clearance channel. The clearance channel is also used to accommodate the vehicle's beam assembly 50. After the battery box assembly is loaded onto the vehicle through the clearance channel, the second battery box 31 and the vehicle's beam assembly 50 are at the same level, thereby increasing the ground clearance of the battery box assembly.

[0023] Through the above arrangement, when the battery box assembly is loaded, the axis of the first battery assembly 20 is perpendicular to the axis of the second battery assembly 30, so that the frame assembly 10 can add a first support beam 11 between the adjacent first battery boxes 21 of the first battery assembly 20, so that the bottom support beam 13 does not need to be additionally welded with a crossbeam structure perpendicular to the vehicle beam assembly 50 to support the second battery assembly 30. While ensuring the structural strength of the frame assembly 10, the bottom support beam 13 only needs to have a structure parallel to the vehicle beam assembly 50, thereby achieving the purpose of simplifying the bottom support structure, reducing the height of the frame assembly 10 in the height direction of the vehicle, and further increasing the ground clearance of the battery box assembly. In this way, the height space required for the battery box assembly to be installed on the vehicle can be saved as a whole, and the space utilization rate can be improved, so that when the vehicle is replaced, it is only necessary to control the top height of the second battery assembly 30 of the battery box assembly to be lower than the beam assembly 50 to install or remove the battery box assembly, and the battery replacement vehicle does not need to occupy too much height space, thereby avoiding the excavation of foundation pits for the battery replacement station and saving the construction cost of the battery replacement station.

[0024] The above-mentioned detachable connection method is not limited, and can be a threaded connection, a rivet connection, a snap connection, etc., which is convenient for assembly, disassembly and replacement.

[0025] In this embodiment, if Figure 1 , Figure 3 As shown, the battery box assembly based on the pitless chassis battery replacement can also include an extension component 40. The extension component 40 includes an extension frame 41 and an extension element 42. The extension frame 41 is detachably connected to the second support beam 12. Part of the second battery box 31 is located in the extension frame 41. The two make way 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 assembly 30 away from the first battery assembly 20.

[0026] Since the extension component 40 does not need to be moved under the vehicle's frame assembly 50 when the vehicle is changing batteries, the top of the extension component 40 can be higher than the frame assembly 50, thereby making full use of the space on the side of the frame assembly 50 facing the battery-changing vehicle, and will not hinder the loading of the battery box assembly, thereby facilitating the addition of other structural components to the battery box assembly and improving space utilization.

[0027] In this embodiment, if 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-cooling unit, and a third battery box. Functional components such as the high-voltage box, the low-voltage box, and the water-cooling unit may be integrated on the expansion frame 41, so as to reasonably arrange the structural parts of the vehicle and improve space utilization. The third battery box may expand the capacity of the battery box assembly and increase the upper limit of the power of the battery box assembly.

[0028] In this embodiment, if Figure 2 As shown, the dimension of the extension element 42 along the length direction 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.

[0029] In other embodiments, Figure 2 As shown, one end of the protection frame 70 of the vehicle is detachably connected to the beam assembly 50 of the vehicle, and the other end extends in a direction away from the beam assembly 50. The protection frame 70 is used to protect the first battery assembly 20 and the second battery assembly 30.

[0030] In this embodiment, if Figure 4 , Figure 5 As shown, the center of gravity of the first battery assembly 20 is located on the side of the center of gravity of the second battery assembly 30 away from the extension assembly 40. By offsetting the center of gravity of the first battery assembly 20 and the center of gravity of the second battery assembly 30, the battery box assembly can achieve a state of center of gravity balance when the extension assembly 40 is added to one side of the second battery assembly 30, thereby avoiding affecting the balance of the vehicle after the battery box assembly is loaded into the vehicle, thereby ensuring the driving safety of the vehicle.

[0031] In this embodiment, if Figure 5 As shown, one end of the first battery assembly 20 away from the extension assembly 40 is flush with the end face of the frame assembly 10 away from the extension assembly 40. A first accommodation space 14 is provided between one end of the first battery assembly 20 close to the extension assembly 40 and the end face of the frame assembly 10 close to the extension assembly 40. Thus, through 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 balance of the vehicle body.

[0032] In this embodiment, the first battery assembly 20 further includes a plurality of first wiring harnesses. The first wiring harnesses are electrically connected to the first battery box 21 in a one-to-one correspondence. The first wiring harnesses are arranged in the first accommodation space 14. The first wiring harnesses are arranged in the first accommodation space 14 formed by the center of gravity offset of the first battery assembly 20 in the frame assembly 10, which can effectively improve the regularity of the wiring harness arrangement of the first battery box 21, improve the space utilization rate, and facilitate the line arrangement.

[0033] In this embodiment, if Figure 4 , Figure 5As shown, the length dimension of the second battery box 31 is greater than the dimension of the first battery assembly 20 along 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 center of gravity offset of the first battery assembly 20 is balanced by the length dimension design of the second battery box 31 and the weight of the expansion 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 space utilization.

[0034] In this embodiment, if Figure 5 As shown, the first accommodating space 14 is connected to the second accommodating space 15, which is convenient for line arrangement. The second battery assembly 30 also includes a plurality of second wire harnesses. The second wire harnesses are electrically connected to the second battery box 31 in a one-to-one correspondence. The second wire harness is passed through the second accommodating space 15. The first wire harness is electrically connected to the second wire harness. The first and second wire harnesses are arranged using the first and second accommodating spaces 14 and 15, further improving the rationality of the layout of the wire harnesses. At the same time, other extension elements 42 that meet the needs of the vehicle can also be arranged in the first and second accommodating spaces 14 and 15.

[0035] In this embodiment, a commercial vehicle is disclosed. The commercial vehicle may include a battery box assembly based on a non-pit chassis battery replacement according to any of the above embodiments. The commercial vehicle may also include a beam assembly 50. Figure 1 As shown, the beam assembly 50 includes two supporting beams 51. The supporting beams 51 correspond one-to-one to the two clearance channels in the battery box assembly. The supporting beams 51 are located in the corresponding clearance channels. The supporting beams 51 correspond one-to-one to the bottom support beams 13 of the battery box assembly. The supporting beams 51 are detachably connected to the corresponding bottom support beams 13. The first battery assembly 20 is located below the second battery assembly 30. Through the above arrangement, the battery box assembly can be stably loaded on the commercial vehicle.

[0036] In other embodiments, Figure 1 As shown, the commercial vehicle may further include wheels 60 and protective frames 70. The wheels 60 are distributed on both sides of the beam assembly 50 along the driving direction of the commercial vehicle. At least one protective frame 70 is located on the side of the extension component 40 of the battery box assembly away from the beam assembly 50. One end of the protective frame 70 is detachably connected to the support beam 51. Figure 2 As shown, when the battery box assembly needs to be loaded onto or removed from a commercial vehicle, the protective frame 70 can be controlled to flip in a direction away from the ground at one end away from the supporting beam 51, so that the battery-exchanging vehicle can perform battery-exchanging according to the set procedure.

[0037] It should be understood that the “present embodiment” mentioned in the present invention is based on the technical points currently described, and multiple “present embodiments” may be the same embodiment or different embodiments.

[0038] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and in actual applications, various changes may be made thereto in form and detail without departing from the scope of the present disclosure.

Claims

1. A battery box assembly based on chassis power replacement without foundation pit, characterized in that: The battery box assembly based on the non-pit chassis battery replacement includes: A frame assembly, the 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 to each other and spaced apart; the plurality of second support beams are parallel to each other and spaced apart; the first support beam and the second support beam are perpendicular to each other; the first support beam and the second support beam are detachably connected; the two bottom support beams are parallel to each other and spaced apart; the bottom support beam is parallel to the second support beam; the bottom support beam and the second support beam are detachably connected; the bottom support beam is used to be detachably connected to the vehicle's beam assembly; A first battery assembly, wherein the first battery assembly comprises a plurality of first battery boxes; the first battery boxes are detachably connected to the frame assembly; the length direction of the first battery box is parallel to the first support beam; the plurality of first battery boxes are arranged alternately with the plurality of first support beams; the height direction of the first battery box is perpendicular to both the first support beam and the second support beam; The second battery assembly comprises a plurality of 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 plurality of second battery boxes and the plurality of second support beams are arranged alternately one by one; the second battery boxes are located in the height direction of the first battery box; two make way channels are arranged between the plurality of second battery boxes; the make way channels are parallel to the bottom supporting beam; the bottom supporting beam corresponds to the make way channels one by one; the bottom supporting beam is located in the corresponding make way channel; the make way channel is also used to accommodate the beam assembly of the vehicle.

2. The battery box assembly based on the pitless chassis battery replacement according to claim 1 is characterized in that: The battery box assembly based on pit-free chassis battery replacement also includes an extension component; the extension component includes an extension frame and an extension element; the extension frame is detachably connected to the second support beam; part of the second battery box is located in the extension frame; the two make way 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 assembly away from the first battery assembly.

3. The battery box assembly based on the pitless chassis battery replacement according to claim 2 is characterized in that: The extension element includes at least one of a high voltage box, a low voltage box, a water cooling unit, and a third battery box.

4. The battery box assembly based on pit-free chassis battery replacement according to claim 2 is characterized in that: A dimension of the extension element along a length direction of the second support beam is smaller than a length of the second battery box.

5. The battery box assembly based on the pitless chassis battery replacement according to claim 4 is characterized in that: The center of gravity of the first battery assembly is located on a side of the center of gravity of the second battery assembly away from the extension assembly.

6. The battery box assembly based on the pitless chassis battery replacement according to claim 5 is characterized in that: One 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 accommodating space is provided between one end of the first battery assembly close to the extension assembly and the end face of the frame assembly close to the extension assembly.

7. The battery box assembly based on the pitless chassis battery replacement according to claim 6 is characterized in that: The first battery assembly also includes a plurality of first wiring harnesses; the first wiring harnesses are electrically connected to the first battery boxes in a one-to-one correspondence; and the first wiring harnesses are passed through the first accommodating space.

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

9. The battery box assembly based on pit-free chassis battery replacement according to claim 8 is characterized in that: The first accommodating space is communicated with the second accommodating space; the second battery assembly also 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 passed through the second accommodating space; the first wiring harnesses are electrically connected to the second wiring harnesses.

10. A commercial vehicle, characterized in that: The commercial vehicle includes: A battery box assembly based on pit-free chassis battery replacement as described in any one of claims 1 to 9; The beam assembly includes two supporting beams; the supporting beams correspond one-to-one to the two clearance channels in the battery box assembly; the supporting beams are located in the corresponding clearance channels; the supporting beams correspond one-to-one to the bottom supporting beams of the battery box assembly; the supporting beams are detachably connected to the corresponding bottom supporting beams; the first battery assembly is located below the second battery assembly.

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