Power battery assembly integrated with bottom support and commercial vehicle

Abstract

The invention relates to the technical field of vehicle battery replacement, in particular to a power battery assembly integrated with a bottom support and a commercial vehicle. The power battery assembly comprises a frame assembly, a battery assembly, a beam assembly and a locking assembly. The battery assembly comprises a first battery module and a second battery module; the first battery module and the second battery module are sequentially stacked in the height direction of the frame assembly; three second battery modules are arranged in parallel; the three second battery modules are sequentially arranged at intervals; a mounting channel is formed between every two adjacent second battery modules; the mounting channel is perpendicular to the height direction of the frame assembly; the mounting channel is used for accommodating a longitudinal beam of the vehicle; the beam assembly comprises a bottom joist which is parallel to the mounting channel; the bottom joist is positioned in the mounting channel; the frame assembly is detachably connected with the bottom joist through a locking assembly; the locking assembly is located in the mounting channel. Therefore, the problem that the requirement for the height space of the battery box is high during chassis battery replacement is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle battery swapping, and in particular, to a power battery assembly integrated with a bottom bracket and a commercial vehicle. Background Art

[0002] In recent years, the new energy vehicle field has developed rapidly, and the chassis battery swapping technology has attracted much attention because it can achieve rapid energy replenishment. Due to the limitation of the space at the bottom of the vehicle, the traditional chassis battery swapping scheme usually relies on a foundation pit structure. By lifting the vehicle or driving it into the pit, the battery swapping mechanism can disassemble and assemble the battery from below the chassis.

[0003] However, this method has significant defects: the construction of the foundation pit requires deep excavation of the site, with high construction costs and a long cycle. Especially in areas with soft soil, high water levels, or complex underground pipe networks, the reinforcement and waterproof treatment of the foundation pit further increase the construction costs. Summary of the Invention

[0004] To solve the problem that the chassis battery swapping has high requirements for the height space of the battery box, the present invention provides a power battery assembly integrated with a bottom bracket and a commercial vehicle.

[0005] In a first aspect, the present invention provides a power battery assembly integrated with a bottom bracket, and the power battery assembly integrated with the bottom bracket includes: A frame assembly; A battery assembly, the battery assembly including a first battery module and a second battery module; the first battery module is detachably connected to the frame assembly; the second battery module is detachably connected to the frame assembly; the first battery module and the second battery module are stacked in sequence along the height direction of the frame assembly; there are three second battery modules arranged in parallel; the three second battery modules are arranged at intervals in sequence; an installation channel is formed between every two adjacent second battery modules; the installation channel is perpendicular to the height direction of the frame assembly; the installation channel is used to accommodate the longitudinal beam of the vehicle; A beam assembly, the beam assembly including a bottom bracket beam, the bottom bracket beam being parallel to the installation channel; the bottom bracket beam is located in the installation channel; the bottom bracket beam is used to be detachably connected to the longitudinal beam; A locking assembly, the frame assembly and the bottom bracket beam are detachably connected through the locking assembly; the locking assembly is located in the installation channel.

[0006] In some embodiments, the locking assembly includes a positioning pin and a locking tongue; the positioning pin is detachably connected to the frame assembly; the positioning pin is parallel to the height direction of the frame assembly; a positioning hole is formed on the bottom bracket beam; the positioning pin is inserted and matched with the positioning hole; the locking tongue is slidably connected to the bottom bracket beam; a locking hole is formed on the positioning pin; the locking tongue is inserted and matched with the locking hole.

[0007] In some embodiments, the bolt has a first wedge surface; the lock hole has a second wedge surface; When the bolt is inserted into the lock hole, the first wedge surface abuts against the second wedge surface; the orientation of the first wedge surface is away from the first battery module; the second wedge surface faces the first battery module.

[0008] In some embodiments, multiple sets of locking assemblies are provided; the first wedge surfaces of some of the bolts are inclined in a first direction of the frame assembly, and the first wedge surfaces of the other bolts are inclined in a second direction of the frame assembly; the first direction is opposite to the second direction; both the first direction and the second direction are perpendicular to the height direction of the frame assembly.

[0009] In some embodiments, the included angle between the first wedge surface and the surface of the first battery module facing the second battery module is less than or equal to the sliding friction angle of the bolt.

[0010] In some embodiments, multiple sets of locking assemblies are provided; The power battery assembly of the integrated bottom bracket further includes a driving assembly; the driving assembly includes a sliding driving part and a connecting rod; the sliding driving part is detachably connected to the bottom bracket beam; the connecting rod is slidably connected to the bottom bracket beam; the connecting rod is parallel to the bottom bracket beam; the sliding driving part is detachably connected to the connecting rod; the sliding driving part drives the connecting rod to translate along the length direction of the installation channel; the bolts of multiple sets of the locking assemblies are all detachably connected to the connecting rod.

[0011] In a second aspect, the present invention provides a commercial vehicle, including: The power battery assembly of the integrated bottom bracket as described in any one of the first aspects; A frame assembly, the frame assembly includes two longitudinal beams and several cross beams; the two longitudinal beams are parallel to each other; the longitudinal beams are parallel to the driving direction of the commercial vehicle; the cross beams are perpendicular to the longitudinal beams; each cross beam is detachably connected to the two longitudinal beams respectively; the longitudinal beams correspond to the bottom bracket beams of the power battery assembly one by one; the longitudinal beams correspond to the installation channels of the power battery assembly one by one; the longitudinal beams are parallel to the bottom bracket beams; the longitudinal beams are located in the corresponding installation channels; the longitudinal beams are detachably connected to the bottom bracket beams.

[0012] In some embodiments, the locking assembly includes a positioning pin and a locking tongue; the positioning pin is detachably connected to the frame assembly; the positioning pin is parallel to the height direction of the frame assembly; a positioning hole is formed in the bottom support beam; the positioning pin is inserted and matched with the positioning hole; the locking tongue is slidably connected to the bottom support beam; a locking hole is formed in the positioning pin; the locking tongue is inserted and matched with the locking hole; The locking tongue has a first wedge surface; the locking hole has a second wedge surface; When the locking tongue is inserted into the locking hole, the first wedge surface abuts against the second wedge surface; the orientation of the first wedge surface is away from the first battery module; the second wedge surface faces the first battery module; The first wedge surface is inclined towards the head direction of the commercial vehicle.

[0013] In some embodiments, the locking assembly includes a positioning pin and a locking tongue; the positioning pin is detachably connected to the frame assembly; the positioning pin is parallel to the height direction of the frame assembly; a positioning hole is formed in the bottom support beam; the positioning pin is inserted and matched with the positioning hole; the locking tongue is slidably connected to the bottom support beam; a locking hole is formed in the positioning pin; the locking tongue is inserted and matched with the locking hole; The locking tongue has a first wedge surface; the locking hole has a second wedge surface; When the locking tongue is inserted into the locking hole, the first wedge surface abuts against the second wedge surface; the orientation of the first wedge surface is away from the first battery module; the second wedge surface faces the first battery module; A plurality of groups of the locking assemblies are provided; the first wedge surfaces of some of the locking tongues are inclined towards the head direction of the commercial vehicle, and the first wedge surfaces of the other part of the locking tongues are inclined towards the tail direction of the commercial vehicle.

[0014] In some embodiments, the length of the locking tongue with the first wedge surface inclined towards the head direction from the head of the commercial vehicle is a first distance; the length of the locking tongue with the first wedge surface inclined towards the tail direction from the head of the commercial vehicle is a second distance; the first distance is greater than the second distance.

[0015] To solve the problem that the chassis battery swapping has relatively high requirements for the height space of the battery box, the present invention has the following advantages: The locking component is built into the space of the installation channel to impose a rigid constraint on the frame component. At the same time, by embedding the bottom support beam into the space of the installation channel, the additional occupation of the bottom space of the power battery assembly by the traditional externally mounted bottom support beam is effectively avoided, so that the height stacking space of the power battery assembly can be compressed. Then the locking component completes the fixing and locking of the battery component inside the installation channel, which not only ensures the connection stability and anti-impact performance, but also avoids the redundancy of the protection structure caused by the exposure of the locking component, thereby increasing the ground clearance of the power battery assembly and facilitating the realization of battery swapping without a pit chassis. Description of the Drawings

[0016] Figure 1 Shows a schematic diagram of the assembly of an integrated bottom support power battery assembly and a commercial vehicle in an embodiment; Figure 2 Shows a front view of the assembly of an integrated bottom support power battery assembly and a commercial vehicle in an embodiment; Figure 3 Shows a schematic diagram of an integrated bottom support power battery assembly in an embodiment; Figure 4 Shows a schematic diagram of the beam assembly of an integrated bottom support power battery assembly in an embodiment; Figure 5 Shows a schematic diagram of the locking component of an integrated bottom support power battery assembly in an embodiment; Figure 6 Shows a cross-sectional view of the locking component of an integrated bottom support power battery assembly in an embodiment; Figure 7 Shows a schematic diagram of the locking component of an integrated bottom support power battery assembly in another embodiment; Figure 8 Shows a cross-sectional view of the locking component of an integrated bottom support power battery assembly in another embodiment; Figure 9 Shows a schematic diagram of the positioning pin and locking tongue of an integrated bottom support power battery assembly in an embodiment.

[0017] Reference Numerals: Frame Component 10; Battery Component 20; First Battery Module 21; Second Battery Module 22; Installation Channel 23; Beam Component 30; Bottom Support Beam 31; Bolt Locking Unit 32; Positioning Hole 33; Locking Component 40; Positioning Pin 41; Locking Tongue 42; Locking Hole 43; First Wedge Surface 44; Second Wedge Surface 45; Driving Component 50; Sliding Driving Portion 51; Connecting Rod 52; Main Beam Assembly 60; Longitudinal Beam 61; Cross Beam 62; Wheel 70. Detailed Description of the Embodiment

[0018] The present disclosure will now be described with reference to several exemplary embodiments. It should be understood that these embodiments are described only to enable those of ordinary skill in the art to better understand and thus implement the present disclosure, rather than to imply any limitation on the scope of the present disclosure.

[0019] As used herein, the term "comprising" and its variants are to be construed as open-ended terms meaning "including but not limited to". The term "based on" is to be construed as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be construed as "at least one embodiment". The term "another embodiment" is to be construed as "at least one other embodiment". The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit that the indicated device, element or component must have a specific orientation, or be constructed and operated in a specific orientation. Also, some of the above terms may be used to represent other meanings in addition to the orientation or positional relationship. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present application can be understood according to the specific circumstances. In addition, the terms "mounted", "arranged", "provided with", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral structure; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, or there may be internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present 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 device, element or component. Unless otherwise specified, the meaning of "a plurality" is two or more.

[0020] In this embodiment, the traditional chassis battery swapping scheme usually relies on a pit structure. By lifting the vehicle or driving it into the pit, the battery swapping mechanism disassembles and assembles the battery from below the chassis. However, this method has significant drawbacks: the construction of the pit requires deep excavation of the site, with high construction costs and a long cycle; the chassis battery swapping has strict requirements for the height space of the battery box. The existing battery assembly needs to reserve space for the bottom bracket installation to adapt to the battery swapping mechanism, resulting in an oversized height dimension of the battery box, occupying the chassis layout space of the vehicle and affecting the ground clearance or battery capacity of the whole vehicle. Therefore, to solve the above problems, the present invention provides a power battery assembly integrated with a bottom bracket, asFigure 1 As shown, the power battery assembly with an integrated bottom bracket may include a frame assembly 10, a battery assembly 20, a beam assembly 30, and a locking assembly 40.

[0021] As Figure 3 、 Figure 4 shown, the battery assembly 20 may include a first battery module 21 and a second battery module 22. The first battery module 21 is detachably connected to the frame assembly 10, and the second battery module 22 is detachably connected to the frame assembly 10. The frame assembly 10 supports, fixes, and protects the battery assembly 20. The first battery module 21 and the second battery module 22 are stacked in sequence along the height direction of the frame assembly 10. There may be three second battery modules 22 arranged in parallel, and the three second battery modules 22 may be arranged at intervals in sequence. An installation channel 23 may be formed between every two adjacent second battery modules 22. The installation channel 23 may be perpendicular to the height direction of the frame assembly 10, and the installation channel 23 may be used to accommodate the longitudinal beam 61 of the vehicle. In this way, through the layout design of embedding the longitudinal beam 61 in the installation channel 23, it not only ensures the structural strength requirements of the power battery assembly but also reduces the space occupied by the power battery assembly in the height direction, thus facilitating the battery swapping of the power battery assembly.

[0022] The beam assembly 30 may include a bottom bracket beam 31. The bottom bracket beam 31 may be parallel to the installation channel 23, the bottom bracket beam 31 may be located in the installation channel 23, and the bottom bracket beam 31 may be used to be detachably connected to the longitudinal beam 61. The frame assembly 10 and the bottom bracket beam 31 may be detachably connected through the locking assembly 40. The locking assembly 40 may be located in the installation channel 23. By placing the locking assembly 40 in the space of the installation channel 23, a rigid constraint is imposed on the frame assembly 10. At the same time, by embedding the bottom bracket beam 31 in the space of the installation channel 23, the additional occupation of the bottom space of the power battery assembly by the traditional externally mounted bottom bracket beam 31 is effectively avoided, so that the height stacking space of the power battery assembly is compressed. Then the locking assembly 40 completes the fixing and locking of the battery assembly 20 inside the installation channel 23, which not only ensures the connection stability and anti-impact performance but also avoids the redundancy of the protection structure caused by the exposure of the locking assembly 40, thereby increasing the ground clearance of the power battery assembly and facilitating the realization of pitless chassis battery swapping.

[0023] In this embodiment, as Figure 4 、 Figure 9As shown, the locking assembly 40 may include a locating pin 41 and a locking tongue 42. The locating pin 41 may be detachably connected to the frame assembly 10, and the locating pin 41 may be parallel to the height direction of the frame assembly 10, and the locating pin 41 may ensure the rationality of the force transmission path. A locating hole 33 may be provided on the bottom support beam 31, and the locating pin 41 may be plugged in and matched with the locating hole 33. The locating hole 33 and the locating pin 41 form a plug-in fitting relationship through the precisely machined geometric profile, which can provide an initial positioning reference for the locating pin 41 and effectively limit the radial displacement of the locating pin 41. The locking tongue 42 may be slidably connected to the bottom support beam 31, and a locking hole 43 may be provided on the locating pin 41, and the locking tongue 42 may be plugged in and matched with the locking hole 43. The locking hole 43 and the end of the locking tongue 42 close to the locating pin 41 form a complementary interlocking structure, and when the locking tongue 42 completes the displacement stroke along the preset direction, a bidirectional self-locking effect may be generated, such as Figure 5 , Figure 7 As shown, the preset direction can be the direction in which the locking tongue 42 approaches the positioning pin 41. The axial positioning of the positioning pin 41 and the lateral locking of the locking tongue 42 can maintain the independent detachable characteristics of the locking tongue 42 and the positioning pin 41, while significantly improving the structural stability and anti-separation reliability of the assembly of the positioning pin 41 and the locking tongue 42 under complex working conditions.

[0024] In this embodiment, if Figure 6 As shown, the locking tongue 42 may have a first wedge-shaped surface 44 , and the locking hole 43 may have a second wedge-shaped surface 45 .

[0025] When the lock tongue 42 is inserted into the lock hole 43, the first wedge surface 44 abuts against the second wedge surface 45. The first wedge surface 44 may be oriented in a direction away from the first battery module 21. The second wedge surface 45 may be disposed toward the first battery module 21. When the power battery assembly is mounted on the vehicle, the first wedge surface 44 is tilted upward, and the second wedge surface 45 is tilted downward. Thus, when the lock tongue 42 locks the positioning pin 41, the lock tongue 42 exerts an upward preload force on the positioning pin 41, so that the power battery assembly can be tightly suspended on the chassis of the vehicle. At the same time, a mechanical tolerance of a vertical dimension can be provided, so that when the power battery assembly rises during the assembly process, a certain mechanical error is allowed in the height of each positioning pin 41, so that each positioning pin 41 can form a tight fit with the lock tongue 42. Thus, the power battery assembly will not fall off accidentally, and the reliability of the locking assembly 40 on the power battery assembly under the dynamic working conditions of the vehicle can be ensured.

[0026] In this embodiment, if Figure 8As shown, multiple sets of locking components 40 can be provided. The first wedge surfaces 44 of some locking tongues 42 are inclined in the first direction of the frame component 10, and the first wedge surfaces 44 of the other locking tongues 42 are inclined in the second direction of the frame component 10. The first direction and the second direction are opposite to each other, and both the first direction and the second direction are perpendicular to the height direction of the frame component 10. In the state where the power battery assembly is installed on the vehicle, the first direction and the second direction can be the head direction and the tail direction of the vehicle respectively. Through the symmetric layout of the two-way first wedge surfaces 44 of the locking tongues 42, when each locking tongue 42 performs the plugging and locking action, the contact pressure formed by the first wedge surface 44 of the locking tongue 42 and the second wedge surface 45 of the locking hole 43 can be applied synchronously in opposite directions, thereby establishing a two-way constraint mechanism. In this way, when the power battery assembly encounters shaking or vibration in different directions, it will not be easily displaced and loosened, thus further improving the reliability of the power battery assembly.

[0027] In this embodiment, as Figure 5 , Figure 7 shown, the included angle between the first wedge surface 44 and the surface of the first battery module 21 facing the second battery module 22 is less than or equal to the sliding friction angle of the locking tongue 42. When the locking tongue 42 performs the plugging and locking action, the normal pressure component of the first wedge surface 44 and the frictional resistance of the second wedge surface 45 form a vector balance relationship. In this way, even if an external load attempts to cause a displacement trend of the locking tongue 42 along the disengaging direction, the frictional resistance moment of the contact surface between the first wedge surface 44 and the second wedge surface 45 will also increase synchronously and form a reverse moment compensation, thereby triggering a self-locking effect based on angle matching to ensure that the locking component 40 maintains the stability of the power battery assembly under the dynamic conditions of commercial vehicles.

[0028] In this embodiment, as Figure 6 , Figure 7As shown, multiple sets of locking components 40 can be provided. The power battery assembly with an integrated base can further include a driving component 50. The driving component 50 can include a sliding driving part 51 and a connecting rod 52. The sliding driving part 51 can be detachably connected to the base beam 31. The connecting rod 52 can be slidably connected to the base beam 31. The connecting rod 52 can be parallel to the base beam 31. The sliding driving part 51 can be detachably connected to the connecting rod 52. The sliding driving part 51 can drive the connecting rod 52 to translate along the length direction of the installation channel 23. The locking tongues 42 of multiple sets of locking components 40 are all detachably connected to the connecting rod 52. The sliding driving part 51 maintains a power transmission relationship through the connecting rod 52 arranged axially parallel to the base beam 31. The connecting rod 52 makes a directional translation movement along the preset installation channel 23 of the base beam 31. The displacement track of the connecting rod 52 is precisely controlled through the constraint of the guiding mechanism. The locking tongues 42 of multiple sets of locking components 40 are all mechanically linked to the connecting rod 52. When the sliding driving part 51 outputs a linear driving force, the connecting rod 52 will synchronously drive all the locking tongues 42 to generate a coordinated displacement along the axis of the installation channel 23. In this way, the coordinated action of multiple sets of locking components 40 is realized through a single driving source, which not only ensures the uniform distribution of the contact pressure of the first wedge-shaped surfaces 44 of the locking tongues 42, but also maintains the consistency of the locking action through the connecting rod 52, thereby improving the operation efficiency of locking or disassembling the power battery assembly.

[0029] In this embodiment, as Figure 1 、 Figure 2 shown, a commercial vehicle can include the power battery assembly with an integrated base and the frame assembly 60 in any of the above embodiments.

[0030] The frame assembly 60 can include two longitudinal beams 61 and several cross beams 62. The two longitudinal beams 61 are parallel to each other. The longitudinal beams 61 serve as main load-bearing components and are parallel to the driving direction of the commercial vehicle. The cross beams 62 are perpendicular to the longitudinal beams 61. The cross beams 62 serve as strengthening and fixing components. Each cross beam 62 is detachably connected to the two longitudinal beams 61 respectively. The longitudinal beams 61 correspond to the base beams 31 of the power battery assembly one by one. The longitudinal beams 61 correspond to the installation channels 23 of the power battery assembly one by one. The longitudinal beams 61 are parallel to the base beams 31. The longitudinal beams 61 are located in the corresponding installation channels 23. The longitudinal beams 61 are detachably connected to the base beams 31, so that the longitudinal beams 61 can be accurately axially constrained inside the installation channels 23. The parallel positioning design and detachable connection mechanism of the longitudinal beams 61 and the base beams 31 ensure that the power battery assembly obtains a stable load transfer path in the driving direction of the commercial vehicle. The frame assembly 60 forms a load-bearing capacity in multiple directions through the longitudinal beams 61 and the cross beams 62, and at the same time relies on the connection with the base beam 31 to realize the stable connection between the power battery assembly and the commercial vehicle.

[0031] In this embodiment, as Figure 4 、 Figure 8As shown, the locking assembly 40 may include a positioning pin 41 and a locking tongue 42. The positioning pin 41 may be detachably connected to the frame assembly 10, and the positioning pin 41 may be parallel to the height direction of the frame assembly 10. A positioning hole 33 may be formed in the bottom support beam 31, and the positioning pin 41 may be inserted into and cooperate with the positioning hole 33. The positioning hole 33 and the positioning pin 41 form an insertion and cooperation relationship through geometric profiles with precision machining, which can not only provide an initial positioning reference for the positioning pin 41 but also effectively limit the radial offset of the positioning pin 41. The locking tongue 42 is slidably connected to the bottom support beam 31. A locking hole 43 may be formed in the positioning pin 41, and the locking tongue 42 may be inserted into and cooperate with the locking hole 43.

[0032] The locking tongue 42 may have a first wedge surface 44, and the locking hole 43 may have a second wedge surface 45. When the locking tongue 42 is inserted into the locking hole 43, the first wedge surface 44 abuts against the second wedge surface 45. The orientation of the first wedge surface 44 is in the direction away from the first battery module 21, and the second wedge surface 45 is arranged facing the first battery module 21. The locking hole 43 of the positioning pin 41 and the end of the locking tongue 42 close to the positioning pin 41 form a complementary insertion structure. When the positioning pin 41 and the locking tongue 42 are in an assembled state, the first wedge surface 44 abuts against the second wedge surface 45 on the inner wall of the locking hole 43, thereby locking the power battery assembly to ensure the stability of the power battery assembly when the commercial vehicle is driving. The first wedge surface 44 is inclined towards the front of the commercial vehicle. In this way, through the vector decomposition of the contact force of the first wedge surface 44, when the locking tongue 42 bears the impact force brought by vehicle braking, the self-locking effect of the locking assembly 40 on the battery box assembly can be enhanced.

[0033] In this embodiment, as Figure 7 、 Figure 9 As shown, the locking assembly 40 may include a positioning pin 41 and a locking tongue 42. The positioning pin 41 is detachably connected to the frame assembly 10, and the positioning pin 41 may be parallel to the height direction of the frame assembly 10. A positioning hole 33 is formed in the bottom support beam 31, and the positioning pin 41 may be inserted into and cooperate with the positioning hole 33. The positioning hole 33 and the positioning pin 41 form an insertion and cooperation relationship through geometric profiles with precision machining, which can not only provide an initial positioning reference for the positioning pin 41 but also effectively limit the radial offset of the positioning pin 41. The locking tongue 42 is slidably connected to the bottom support beam 31. A locking hole 43 is formed in the positioning pin 41, and the locking tongue 42 is inserted into and cooperate with the locking hole 43.

[0034] The locking tongue 42 has a first wedge surface 44, and the locking hole 43 has a second wedge surface 45. When the locking tongue 42 is inserted into the locking hole 43, the first wedge surface 44 abuts against the second wedge surface 45. The orientation of the first wedge surface 44 is in the direction away from the first battery module 21. The second wedge surface 45 is arranged facing the first battery module 21.

[0035] There are multiple sets of locking components 40. The first wedge surfaces 44 of some locking tongues 42 are inclined towards the front of the commercial vehicle, and the first wedge surfaces 44 of the other part of the locking tongues 42 are inclined towards the rear of the commercial vehicle. Such a two-way configuration of the first wedge surfaces 44 enables the locking components 40 to generate self-locking effects respectively under the vehicle acceleration and braking conditions. The locking components 40 with the first wedge surfaces 44 inclined towards the front are mainly to reduce the inertial impact on the locking tongues 42 during vehicle braking, thereby extending the service life of the locking tongues. Through the vector decomposition of the normal force of the contact surfaces of the first wedge surfaces 44 and the second wedge surfaces 45, the coordinated action of the two sets of locking tongues 42 forms a two-way load transfer path, which not only ensures longitudinal dynamic stability but also achieves moment balance in the horizontal plane through spatial symmetric distribution, effectively improving the multi-directional impact resistance of the battery assembly 20.

[0036] In this embodiment, as Figure 7 shown, the length of the locking tongue 42 with the first wedge surface 44 inclined towards the front from the front of the commercial vehicle is the first distance. The length of the locking tongue 42 with the first wedge surface 44 inclined towards the rear from the front of the commercial vehicle is the second distance. The first distance is greater than the second distance.

[0037] For the locking tongue 42 with the first wedge surface 44 inclined towards the rear, when the commercial vehicle brakes, the power battery assembly impacts towards the front direction by inertia, so that the second wedge surface 45 of the positioning pin 41 impacts the first wedge surface 44 of the locking tongue 42. The part far from the front is hindered by the part close to the front of itself, and the inertial impact of the power battery assembly close to the front is often greater than the inertial impact of itself far from the rear. Therefore, in the present invention, the first distance is set to be greater than the second distance, so that the locking tongue 42 that bears the inertial impact during vehicle braking, that is, the locking tongue 42 with the first wedge surface 44 inclined towards the rear, is arranged at a position far from the front, thereby reducing the inertial impact borne by the locking tongue 42 and improving the service life of the locking tongue 42.

[0038] Similarly, the locking tongue 42 that bears the inertial impact when the vehicle starts or accelerates, that is, the locking tongue 42 with the first wedge surface 44 facing the front direction, is arranged at a position close to the front. While ensuring locking, there is a tendency for the positioning pin 41 and the locking tongue 42 to gradually separate, reducing the inertial impact borne by the locking tongue 42, thereby improving the service life of the locking tongue 42.

[0039] In some other embodiments, the commercial vehicle may further include multiple wheels 70. The wheels 70 may be movably connected to the longitudinal beams 61. The wheels 70 may be distributed in the four corner regions of the commercial vehicle. Two wheels 70 are symmetrically distributed on both sides of the front end in the length direction of the frame assembly 10, and the other two wheels 70 are symmetrically distributed on both sides of the rear end in the length direction of the frame assembly 10. The beam assembly 30 may further include a bolt locking unit 32. The bottom support beam 31 may be detachably connected to the longitudinal beam 61 through the bolt locking unit 32.

[0040] like Figure 7 As shown, it is preferred that the first wedge-shaped surfaces 44 of the lock tongue 42 tilted toward the front of the vehicle are two, and the first wedge-shaped surfaces 44 tilted toward the rear of the vehicle can be three, so that when the vehicle is in emergency braking, the part away from the front of the vehicle is hindered by the part close to the front of the vehicle, and the inertial impact of the power battery assembly close to the front of the vehicle is often greater than the inertial impact of the power battery assembly away from the rear of the vehicle. The lock tongue 42 that is subjected to inertial impact when the vehicle brakes, that is, the lock tongue 42 with the first wedge-shaped surface 44 tilted toward the rear of the vehicle, is arranged at a position away from the front of the vehicle, thereby reducing the inertial impact borne by the lock tongue 42 and improving the service life of the lock tongue 42. Similarly, the lock tongue 42 with the first wedge-shaped surface 44 facing the front of the vehicle is arranged at a position close to the front of the vehicle. While ensuring locking, the positioning pin 41 and the lock tongue 42 will have a tendency to gradually separate, reducing the inertial impact borne by the lock tongue 42, thereby improving the service life of the lock tongue 42. In this way, while ensuring that the locking assembly 40 locks the battery assembly 20, the inertial impact on the lock tongue 42 can be reduced, thereby extending the service life of the lock tongue 42.

[0041] In other embodiments, when the battery-swapping vehicle enters the battery-swapping platform, the visual positioning system and the guide rail are coordinated to achieve millimeter-level precise alignment to ensure that the power battery assembly and the chassis bracket axis of the vehicle are completely coincident. The battery-swapping device sends an unlocking command to the locking assembly 40, and the driving connecting rod 52 links multiple sets of lock tongues 42 to synchronously exit the lock hole 43 of the positioning pin 41, thereby releasing the self-locking constraint of the two-way wedge surface between the power battery assembly and the frame. Then the power battery assembly with integrated bottom bracket is vertically lifted out of the commercial vehicle by the jacking mechanism, and the battery-swapping robot grabs the battery assembly 20 and translates it along the preset path to the charging compartment, maintaining the parallel posture of the bottom support beam 31 and the longitudinal beam 61 throughout the process. The battery-swapping robot then embeds the fully charged battery assembly 20 into the commercial vehicle, and the positioning pin 41 is automatically inserted into the guide hole of the bottom support beam 31 to complete the initial positioning. The lock tongue 42 is self-locked along the two-way inclined wedge surface under the action of the driving assembly 50, thereby completing the battery-swapping action for the commercial vehicle.

[0042] 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.

[0043] 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 power battery assembly with an integrated bottom bracket, characterized in that: The power battery assembly with integrated bottom bracket includes: Frame components; A battery assembly, the battery assembly comprising a first battery module and a second battery module; the first battery module is detachably connected to the frame assembly; the second battery module is detachably connected to the frame assembly; the first battery module and the second battery module are stacked in sequence along the height direction of the frame assembly; three second battery modules are arranged in parallel; the three second battery modules are arranged in sequence at intervals; an installation channel is formed between each two adjacent second battery modules; the installation channel is perpendicular to the height direction of the frame assembly; the installation channel is used to accommodate the longitudinal beam of the vehicle; A beam assembly, the beam assembly comprising a bottom support beam, the bottom support beam being parallel to the installation channel; the bottom support beam being located in the installation channel; the bottom support beam being used for being detachably connected to the longitudinal beam; A locking assembly, wherein the frame assembly and the bottom support beam are detachably connected via the locking assembly; the locking assembly is located in the installation channel.

2. The power battery assembly with integrated bottom support according to claim 1, characterized in that: The locking assembly includes a positioning pin and a locking tongue; the positioning pin is detachably connected to the frame assembly; the positioning pin is parallel to the height direction of the frame assembly; a positioning hole is provided on the bottom support beam; the positioning pin is plug-fitted into the positioning hole; the locking tongue is slidably connected to the bottom support beam; a locking hole is provided on the positioning pin; the locking tongue is plug-fitted into the locking hole.

3. The power battery assembly with integrated bottom support according to claim 2, characterized in that: The lock tongue has a first wedge-shaped surface; the lock hole has a second wedge-shaped surface; When the lock tongue is inserted into the lock hole, the first wedge surface abuts against the second wedge surface; the first wedge surface is oriented away from the first battery module; and the second wedge surface is disposed toward the first battery module.

4. The power battery assembly with integrated bottom support according to claim 3, characterized in that: The locking assembly is provided with multiple groups; the first wedge surfaces of some of the locking tongues are inclined toward the first direction of the frame assembly, and the first wedge surfaces of other parts of the locking tongues are inclined toward the second direction of the frame assembly; the first direction is opposite to the second direction; the first direction and the second direction are both perpendicular to the height direction of the frame assembly.

5. The power battery assembly with integrated bottom support according to claim 3, characterized in that: An angle between the first wedge-shaped surface and a surface of the first battery module facing the second battery module is less than or equal to a sliding friction angle of the locking tongue.

6. The power battery assembly with integrated bottom support according to claim 2, characterized in that: The locking assembly is provided in multiple groups; The power battery assembly with integrated bottom support also includes a driving component; the driving component includes a sliding driving unit and a connecting rod; the sliding driving unit is detachably connected to the bottom support beam; the connecting rod is slidably connected to the bottom support beam; the connecting rod is parallel to the bottom support beam; the sliding driving unit is detachably connected to the connecting rod; the sliding driving unit drives the connecting rod to translate along the length direction of the installation channel; the locking tongues of multiple groups of the locking assemblies are detachably connected to the connecting rod.

7. A commercial vehicle, characterized in that: The commercial vehicle includes: A power battery assembly with an integrated base as claimed in any one of claims 1 to 6; A beam assembly, the beam assembly comprising two longitudinal beams and a plurality of cross beams; the two longitudinal beams are parallel to each other; the longitudinal beam is parallel to the driving direction of the commercial vehicle; the cross beam is perpendicular to the longitudinal beam; each cross beam is detachably connected to the two longitudinal beams; the longitudinal beams correspond one-to-one with the bottom support beams of the power battery assembly; the longitudinal beams correspond one-to-one with the installation channels of the power battery assembly; the longitudinal beams are parallel to the bottom support beams; the longitudinal beams are located in the corresponding installation channels; the longitudinal beams are detachably connected to the bottom support beams.

8. A commercial vehicle according to claim 7, characterized in that: The locking assembly comprises a positioning pin and a locking tongue; the positioning pin is detachably connected to the frame assembly; the positioning pin is parallel to the height direction of the frame assembly; a positioning hole is provided on the bottom support beam; the positioning pin is plugged into the positioning hole; the locking tongue is slidably connected to the bottom support beam; a locking hole is provided on the positioning pin; the locking tongue is plugged into the locking hole; The lock tongue has a first wedge-shaped surface; the lock hole has a second wedge-shaped surface; When the lock tongue is inserted into the lock hole, the first wedge surface abuts against the second wedge surface; the first wedge surface is oriented away from the first battery module; and the second wedge surface is disposed toward the first battery module; The first wedge-shaped surface is inclined toward the front direction of the commercial vehicle.

9. A commercial vehicle according to claim 7, characterized in that: The locking assembly comprises a positioning pin and a locking tongue; the positioning pin is detachably connected to the frame assembly; the positioning pin is parallel to the height direction of the frame assembly; a positioning hole is provided on the bottom support beam; the positioning pin is plugged into the positioning hole; the locking tongue is slidably connected to the bottom support beam; a locking hole is provided on the positioning pin; the locking tongue is plugged into the locking hole; The lock tongue has a first wedge-shaped surface; the lock hole has a second wedge-shaped surface; When the lock tongue is inserted into the lock hole, the first wedge surface abuts against the second wedge surface; the first wedge surface is oriented away from the first battery module; and the second wedge surface is disposed toward the first battery module; The locking assembly is provided in multiple groups; the first wedge-shaped surfaces of some of the locking tongues are inclined toward the front direction of the commercial vehicle, and the first wedge-shaped surfaces of another part of the locking tongues are inclined toward the rear direction of the commercial vehicle.

10. A commercial vehicle according to claim 9, characterized in that: The length of the locking tongue with the first wedge-shaped surface inclined toward the front of the vehicle from the front of the commercial vehicle is a first distance; the length of the locking tongue with the first wedge-shaped surface inclined toward the rear of the vehicle from the front of the commercial vehicle is a second distance; the first distance is greater than the second distance.

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