CN213057224U

CN213057224U - Car B post lower clutch structure and electric automobile

Info

Publication number: CN213057224U
Application number: CN202021171085.7U
Authority: CN
Inventors: 唐志坚
Original assignee: Guangzhou Automobile Group Co Ltd
Current assignee: Guangzhou Automobile Group Co Ltd
Priority date: 2020-06-22
Filing date: 2020-06-22
Publication date: 2021-04-27
Anticipated expiration: 2030-06-22

Abstract

The utility model relates to the field of automotive technology, a car B post lower clutch structure is disclosed, it includes threshold inner panel, B post inner panel, floor crossbeam and last connecting piece, the threshold inner panel includes in the past to the threshold body that extends after to and locates the top of threshold body upwards extends and is higher than the extension of floor crossbeam upper surface, the lower extreme of B post inner panel with the extension overlap joint, the one end of floor crossbeam with this body coupling of threshold, go up the one end of connecting piece with the extension is connected, the other end of going up the connecting piece with the top of floor crossbeam is connected, just it is close to from going up the connecting piece the one end of extension to the downward sloping setting gradually of the other end. The utility model provides a car B post lower clutch structure and electric automobile, its structural strength is big, can guarantee battery collision security effectively.

Description

Car B post lower clutch structure and electric automobile

Technical Field

The utility model relates to the field of automotive technology, especially, relate to a car B post lower clutch structure and electric automobile.

Background

Along with the continuous increase of the demand of the automobile consumption market for the endurance mileage of the pure electric vehicle, the capacity and the volume of the power battery are continuously increased, so that the difficulty of meeting the requirement of the collision performance of the side column of the pure electric vehicle is continuously increased. The side column collision performance refers to the structural integrity of the battery when the side part of the vehicle body is collided by a column-shaped hard object.

In the early stage of pure electric vehicle development, in order to reduce the matching cost and the matching period of the whole vehicle, a manufacturer adopts a method of developing and modifying based on the existing fuel vehicle type. The advantage of this is that the chassis and body structure has been long verified and relatively mature, and the disadvantage is that the battery has to be developed in the light of existing other structures and systems, as shown in fig. 1 below, the shape of the battery 5 is irregular and the capacity is relatively small. As shown in fig. 2, the main frame structure of the front floor is formed by overlapping a rocker inner panel 1 and a cross member 4 disposed in the lateral direction. The inner sill plate 1 and the cross beam 4 are overlapped in the vertical direction, the cross beam 4 is tightly propped against the inner sill plate 1, and meanwhile, the distance between the inner sill plate 1 and the longitudinal beam 3 is large. The area between the inner sill plate 1 and the longitudinal beam 3 is a structural buffer area in column collision, and the larger the width of the area is, the more the longitudinal beam 3 can be prevented from being extruded towards the battery 5, so that the damage of the battery 5 due to external force collision can be prevented.

With market development, pure electric vehicle types are continuously increased, the reasonable design of the battery is more studied during development, the battery needs to be universal in different vehicle types, the shape of the battery is designed as regular as possible, and the size is continuously increased. As shown in fig. 3, the total width and the total height of the battery 5 become large. The increase of the volume of the power battery 5 not only occupies more vehicle body space, but also changes the overlapping structure of the floor structure. As shown in fig. 4, the battery 5 is arranged below the floor panel 2. The battery 5 is arranged on one side of the longitudinal beam 3, and the longitudinal beam 3 is connected with the sill inner plate 1 through the lower connecting piece 6. After the volume of the battery 5 is increased, the floor panel 2 is lifted to the upper part of the sill inner panel 1, and the end part of the cross beam 4 is obliquely arranged downwards towards the outer side to be connected with the sill inner panel 1. The inner plate 1 of the threshold and the cross beam 4 only have small part of the overlapping structure and are connected only by three or four welding points, and the connection is weak. Even the inner plate 1 of the threshold and the cross beam 4 are staggered in the vertical direction, so that the whole front floor bearing frame structure is not connected, and the strength is weakened. During the side pillar collision, the beam 4 is subjected to an upward external force L1, and an obliquely upward force L2 transmitted from the lower link 6 is applied. The directions of the external forces L1 and L2 are inclined upwards, so that the cross beam 4 is easy to bend, and the longitudinal beam 3 moves towards the inside of the vehicle and is extruded on the surface of the battery 5, thereby endangering the structural integrity of the battery 5.

SUMMERY OF THE UTILITY MODEL

The utility model aims at: the utility model provides a car B post lower clutch structure and electric automobile, its structural strength is big, can guarantee battery collision security effectively.

In order to achieve the aim, the utility model provides an automobile B-pillar lower joint structure, which comprises a doorsill inner plate, a B-pillar inner plate, a floor beam and an upper connecting piece,

the doorsill inner plate comprises a doorsill body extending from front to back and an extending part which is arranged at the top of the doorsill body and extends upwards, the lower end of the B-pillar inner plate is in lap joint with the extending part, the floor beam is arranged on the inner side of the doorsill inner plate, one end of the floor beam is connected with the doorsill body, and the extending part is higher than the upper surface of the floor beam; the upper connecting piece is located above the floor beam, one end of the upper connecting piece is connected with the extending portion, the other end of the upper connecting piece is connected with the top of the floor beam, and the upper connecting piece is gradually inclined downwards from one end close to the extending portion to the other end.

Preferably, the width of the upper connector is gradually reduced from one end near the extension portion to the other end.

Preferably, the upper connecting piece comprises a connecting piece body, a first flanging arranged at one end of the connecting piece body and two second flanging arranged at two sides of the bottom of the connecting piece body respectively, the first flanging is connected with the extending part, and the connecting piece body and the second flanging are connected with the floor beam.

Preferably, the connecting piece body is provided with a welding through hole, and the central axis of the welding through hole is perpendicular to the connecting surface of the floor beam and the threshold body.

Preferably, the floor beam comprises a beam body and a first connecting part, one end of the first connecting part is connected with the beam body, the other end of the first connecting part is connected with the extending part, the other end of the upper connecting part is connected with the top of the beam body, and the first connecting part is gradually inclined upwards from one end close to the extending part to the other end.

Preferably, the width of the first connection portion increases from one end near the extension portion to the other end.

Preferably, one end of the first connecting portion, which is close to the extending portion, is provided with a lapping portion, the lapping portion is gradually inclined upwards from the end close to the first connecting portion to the other end, and the first connecting portion is connected with the doorsill body through the lapping portion.

Preferably, the floor further comprises a floor arranged below the floor cross beam, the floor comprises a floor body and a second connecting portion arranged at one end of the floor body, the top side of the floor body is connected with the bottom side of the cross beam body, one end, close to the extending portion, of the second connecting portion is connected with the doorsill body, the top side of the second connecting portion is connected with the bottom side of the first connecting portion, and the second connecting portion gradually inclines upwards from one end, close to the extending portion, to the other end.

Preferably, the floor further comprises a longitudinal beam extending in the front-rear direction, the longitudinal beam is arranged at a position of the floor body close to the second connecting portion, and the top side of the longitudinal beam is connected with the bottom side of the floor body.

Preferably, the doorsill further comprises a lower connecting piece, one end of the lower connecting piece is connected with the bottom of the doorsill body, the other end of the lower connecting piece is connected with the bottom side of the longitudinal beam, and the lower connecting piece is gradually and obliquely arranged upwards from one end close to the extending portion to the other end.

In order to solve the same technical problem, this application still provides an electric automobile, its include the battery and as above-mentioned any technical scheme car B post lower clutch structure, the battery sets up car B post lower clutch structure's below.

The utility model provides a pair of car B post lower clutch structure and electric automobile compare with prior art, its beneficial effect lies in: the threshold body upwards extends to have an extension, and the threshold inner panel passes through extension and B post inner panel overlap joint. The arrangement of the extension part increases the inner plate of the threshold, which is beneficial to the connection of the upper connecting piece and the inner plate of the threshold. The floor beam is connected with the extension part through an upper connecting piece, and the upper connecting piece can strengthen the connecting structure between the floor beam and the sill inner plate. When collision occurs, the upper connecting piece can effectively absorb and transmit energy transmitted from the outside during collision. Because the upper connecting piece is gradually inclined upwards from the inner side to the outer side of the automobile, the force transmission path of the B-column lower joint structure is changed, and the force received by the B-column lower joint structure can be converged to the floor beam when collision occurs. The floor beam is simultaneously acted by an upper external force and a lower external force, the two forces can form a resultant force along the direction of the floor beam, so that the floor beam can be crushed rather than bent and deformed, the energy can be absorbed to the maximum extent, the degree of inward invasion of the structure is reduced, and the safety of the battery is ensured.

Drawings

FIG. 1 is a perspective view of a battery of a pure electric vehicle at an early stage of development;

FIG. 2 is a main frame structure view of a front floor at an early development stage;

FIG. 3 is a perspective view of a battery of a prior art electric vehicle;

FIG. 4 is a main frame structure view of a front floor in the prior art;

FIG. 5 is a schematic structural view of a sill inner panel and a B-pillar inner panel of the prior art;

fig. 6 is a schematic structural view of a rocker inner panel and a B-pillar inner panel according to an embodiment of the present invention;

fig. 7 is a front left side perspective view of a lower joint structure of a B-pillar of an automobile according to an embodiment of the present invention;

FIG. 8 is a cross-sectional view taken along line A-A of FIG. 7;

fig. 9 is a perspective view of a lower joint structure of a B-pillar of an automobile according to an embodiment of the present invention in a side direction;

fig. 10 is a perspective view of a lower joint structure of a B-pillar of an automobile according to an embodiment of the present invention in a top view direction;

fig. 11 is a perspective view of the lower joint structure 9 (upper joint is omitted) of the B-pillar of the vehicle according to the embodiment of the present invention.

In fig. 1 to 5, 1, a sill inner panel; 2. a floor panel; 3. a stringer; 4. a cross beam; 5. a battery; 6. a lower connecting piece;

in fig. 5 to 11, 7, a rocker inner panel; 71. a threshold body; 72. an extension portion; 8. b column inner plates; 9. a cross beam; 91. a beam body; 92. a first connection portion; 93. a lap joint section; 10. an upper connecting piece; 101. a connector body; 102. a first flanging; 103. second flanging; 11. a stringer; 12. welding the through hole; 13. a battery; 14. a floor; 141. a floor body; 142. a second connecting portion; 15. a void; 16. a reinforcing plate; 17. and a lower connecting piece.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description of the present invention, it should be understood that the terms used in the present invention are used in the description of the present invention, and it should be understood that the terms "upper", "lower", "front", "rear", "vertical", "top", "bottom", "inner", "outer", and the like used in the present invention are used in the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplification of the description, but not for indication or suggestion that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present invention.

It should be noted that in the present disclosure, "upper", "lower", "front", "rear", "left", "right" refer to directions relative to the vehicle, and "inner" and "outer" refer to directions toward or away from, respectively, the geometric center of the vehicle.

Note that, the "central axis of the welded via hole" in the present invention refers to a central line Z (shown in fig. 8) perpendicular to the reference plane and passing through the welded via hole, with the upper surface of the connector body being the reference plane.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 6 to 11, the utility model discloses a car B post lower clutch structure of preferred embodiment, it includes threshold inner panel 7, B post inner panel 8, floor beam 9 and upper connector 10, threshold inner panel 7 includes threshold body 71 that extends and locate the top of threshold body 71 and the extension 72 that upwards extends from the past to the back, the lower extreme and the extension 72 overlap joint of B post inner panel 8, floor beam 9 locates the inboard of threshold inner panel 7, and the one end and the threshold body 71 of floor beam 9 are connected, extension 72 is higher than floor beam 9 upper surface. The upper connecting piece 10 is located above the floor cross beam 9, one end of the upper connecting piece 10 is connected with the extending portion 72, the other end of the upper connecting piece 10 is connected with the top of the floor cross beam 9, and the upper connecting piece 10 is gradually inclined downwards from one end close to the extending portion 72 to the other end, that is, the upper connecting piece 10 is gradually inclined upwards from the inner side to the outer side of the automobile.

Based on the technical scheme, the threshold inner plate 7 and the B-pillar inner plate 8 are indispensable parts of the vehicle body, and compared with the conventional design, the threshold body 71 extends upwards to form the extension part 72, and the extension part 72 is lapped with the lower part of the B-pillar inner plate 8 to form an important joint between the upper vehicle body and the lower vehicle body. The height of the extension 72 is extended above the top surface of the floor cross member 9 so that the upper connecting member 10 connects the floor cross member 9 with the extension 72 of the rocker inner 7. The upper connecting piece 10 is a newly added part, one end of the upper connecting piece 10 close to the inner side of the automobile is welded on the top surface and/or the side surface of the beam body 91, and the other end is lapped on the extension part 72 to support the extension part 72. During production, the floor beam 9 and the upper connecting piece 10 are welded into an assembly, and then the upper connecting piece 10 and the extension part 72 are welded. The upper connecting piece 10 is used as an extension section of the floor beam 9, and the strength of the floor beam 9 and the threshold inner plate 7 at the lap joint is ensured not to be reduced. Due to the addition of the upper connecting elements 10 at both ends of the floor cross member 9, this corresponds to a divergent effective extension of the floor cross member 9 at the ends. The upper connector 10 and the extension 72 are butted. Moreover, the upper connecting piece 10 is gradually inclined downwards from the outer side to the inner side of the automobile to form a new force transmission path L1', the existing force transmission path L1 which is inclined upwards from the outer side to the inner side is changed, and the impact force applied to the B-pillar lower joint structure can be converged to the floor cross beam 9. The floor beam 9 is simultaneously acted by an upper external force and a lower external force, the two forces can form a resultant force along the direction of the floor beam 9, so that the floor beam 9 can crush instead of bend deformation, the energy can be absorbed to the maximum extent, the degree of inward invasion of the structure is reduced, and the safety of the battery 13 is ensured.

As shown in fig. 5, the conventional door opening sealing surfaces are provided on the B-pillar inner panel 8. In the present embodiment, as shown in fig. 6, since the rocker inner panel 7 extends upward, part of the door opening sealing surface moves from the B-pillar inner panel 8 onto the extension 72. And the width of the bottom end of the B-pillar inner panel 8 can be reduced accordingly.

The floor cross beam 9 includes a cross beam body 91 and a first connecting portion 92 disposed at one end of the cross beam body 91, one end of the first connecting portion 92 is connected to the cross beam body 91, and the other end of the first connecting portion 92 is connected to the extending portion 72. The other end of the upper link 10 is located above the first connecting portion 92 and connected to the top of the cross beam body 91. In order to connect the floor cross member 9 and the rocker body 71 to form a stable structure, the first connecting portion 92 is disposed to be gradually inclined upward from one end close to the extending portion 72 to the other end, that is, to be gradually inclined downward from the inner side to the outer side of the automobile, so that one end of the first connecting portion 92 away from the cross member body 91 can be connected to the rocker body 71 with a lower height, and the first connecting portion 92 is welded to the rocker inner panel 7. As shown in fig. 11, the width of the first connecting portion 92 in the present embodiment gradually increases from one end near the extending portion 72 to the other end, so that the floor cross member 9 forms a beam structure having a small width at both ends and a large width in the middle.

In addition, the overlapping portion 93 is provided at one end of the first connecting portion 92 close to the extending portion 72, the overlapping portion 93 is gradually inclined upward from the end close to the first connecting portion 92 to the other end, and the first connecting portion 92 is connected to the rocker body 71 through the overlapping portion 93. The lap portion 93 is gradually inclined downward from the inside toward the outside of the automobile so that the first connecting portion 92 of the floor cross member 9 can be firmly connected with the rocker body 71. Since the height of the upper joint member 10 is higher than that of the floor cross member 9, the joint of the lap portion 93 and the rocker body 71 is located below the joint of the upper joint member 10 and the rocker body 71.

The floor cross member 9 is low in height due to the footrest of the rear passenger, resulting in a small cross-sectional bending resistance of the cross member body 91. In order to avoid the structural reinforcement of the first connecting portion 92 and the weakening of the structural strength of the cross beam body 91, so that the middle portion of the cross beam body 91 is easily bent during collision, as shown in fig. 8, at least one reinforcing plate 16 is arranged in the cross beam body 91, and the reinforcing plate 16 is connected to the inner wall of the floor cross beam 9, so that the cavity cross-sectional structure of the cross beam body 91 is complicated, and the bending resistance of the cross beam body 91 is improved.

In addition, the lower joint structure of the B-pillar of the automobile further includes a floor 14 disposed below the floor beam 9, and the floor 14 includes a floor body 141 and a second connecting portion 142 disposed at one end of the floor body 141. The top side of the floor body 141 is connected to the bottom side of the cross member body 91, one end of the second connecting portion 142 adjacent to the extension portion 72 is connected to the sill body 71, the top side of the second connecting portion 142 is connected to the bottom side of the first connecting portion 92, and the second connecting portion 142 is gradually inclined upward from one end adjacent to the extension portion 72 to the other end to make a sufficient space for installing the battery 13. In this embodiment, a gap 15 is left between the top side of the first connecting portion 92 and the top side of the second connecting portion 142 and the bottom side of the upper connecting member 10, and the gap 15 forms a process operation opening so that the worker can apply the sealant on the boundary of the floor 14.

Specifically, the lower joint structure of the B-pillar of the automobile further includes a longitudinal beam 11 extending in the front-rear direction, the longitudinal beam 11 is disposed perpendicular to the floor cross member 9, the longitudinal beam 11 is disposed at a position of the floor body 141 close to the second connecting portion 142, and the top side of the longitudinal beam 11 is connected with the bottom side of the floor 14, so that the overall structural strength of the automobile can be enhanced. More specifically, the automobile B-pillar lower joint structure further includes a lower joint member 17, one end of the lower joint member 17 being connected to the bottom of the rocker body 71, and the other end of the lower joint member 17 being connected to the bottom side of the side member 11. The lower link 17 forms a force transmission path L2 for transmitting the impact energy of the external force to the side member 11. The lower connecting piece 17 is arranged to be gradually upward from one end to the other end of the extending portion 72, namely, to be gradually inclined downward from inside to outside, and corresponds to the upper connecting piece 10 which is arranged to be inclined upward from inside to outside, when a side collision occurs to the automobile, the upper connecting piece 10 and the lower connecting piece 17 form two force transmission paths L1 'and L2 which are finally converged at the cross beam body 91, and because the inclination directions of the upper connecting piece 10 and the lower connecting piece 17 are opposite, the cross beam body 91 is simultaneously subjected to the inclined upward L2 and the inclined downward L1', the two forces have an offsetting tendency in the vertical direction, and a resultant force approximately along the direction of the floor cross beam 9 is formed, so that the floor cross beam 9 cannot be bent, and the longitudinal beam 11 cannot be used for overturning the floor cross beam. The upper connecting piece, the lower connecting piece, the end part of the floor beam 9 and the longitudinal beam 11 can absorb most of the impact energy, and the longitudinal beam 11 is prevented from pressing the surface of the battery 13 inwards.

Preferably, the width of the upper link 10 is gradually reduced from the outside to the inside of the automobile, that is, the width of the upper link 10 is gradually reduced from one end near the extension 72 to the other end. The cross section of the upper connecting piece 10 is in a horn shape, so that external force can be conveniently transmitted to the beam body 91 with smaller width from the wide inner sill plate 7. The upper connecting piece 10 comprises a connecting piece body 101, a first flanging 102 arranged at one end of the connecting piece body 101 and two second flanging 103 respectively arranged at two sides of the bottom of the connecting piece body 101, the first flanging 102 is connected with the extending part 72, and the connecting piece body 101 and the second flanging 103 are connected with the floor beam 9. The number of the first flanges 102 in this embodiment may be three, and the three first flanges 102 all extend upward, two of the first flanges 102 are disposed on two sides of the outer end of the connector body 101, and the other flange 102 is disposed in the middle of the outer end of the connector body 101. The second turned-over edge 103 extends forwards and backwards along the front, back and side of the beam body 91 respectively, and specifically includes: the second flange 103 located on the front side of the cross member body 91 extends in the direction of the front side of the automobile, and the second flange 103 located on the rear side of the cross member body 91 extends in the direction of the rear side of the automobile. The second flange 103 is used to reinforce the connection between the connector body 101 and the cross member body 91. The both sides of the bottom of crossbeam body 91 also are equipped with the turn-ups, go up connecting piece 10 and weld on the turn-ups of crossbeam body 91 through second turn-ups 103, and the top side at crossbeam body 91 is connected to the bottom side of connecting piece body 101, realizes going up connecting piece 10 and floor crossbeam 9's firm being connected. The second flanges 103 on both sides and the connector body 101 form a structure with a vertical cross section in a shape of a Chinese character 'ji'. The upper connecting piece 10 is provided with a welding through hole 12, and the central axis of the welding through hole 12 is vertical to the connecting surface of the floor beam 9 and the threshold body 71. During assembly, a worker can weld the first connecting portion 92 of the floor cross member 9 and the threshold body 71 in a standard manner through the welding through hole 12. The shape of the welding through hole 12 is oblong, so that enough operation space can be provided for welding work. And the welding via hole 12 is not provided with sharp corners, so that the scraping of workers or other automobile accessories is prevented.

In order to solve the same technical problem, the present application further provides an electric vehicle, which includes a battery 13 and a lower joint structure of a B-pillar of an automobile in any one of the above technical solutions. As shown in fig. 8, the battery 13 is mounted below the side member 11 in the lower joint structure of the B-pillar of the automobile via a battery bracket. This electric motor car bumps the in-process at the side pillar through increasing connecting piece 10 at floor crossbeam 9 both ends, can strengthen the joint strength between floor crossbeam 9 and the threshold inner panel 7, is favorable to the post to bump the middle structure buffers and absorbs most collision energy, has guaranteed battery 13 collision security effectively. In addition, the lower joint structure of the B column of the automobile has small changes to the positions and the shapes of parts such as the inner doorsill plate 7, the floor beam 9, the longitudinal beam 11 and the like, and the newly added upper connecting piece 10 is positioned near a lower fixed point of the front row safety belt and is a position which can not be used by passengers generally. The upper connecting member 10 performs a crushing deformation function without using a thermal forming material, so that the cost increase of the upper connecting member 10 is relatively small. The electric automobile has the advantages of small overall change, low modification cost and high process feasibility. If the floor cross member 9 is increased in size or the like to provide the connecting structural strength, the foot space of the occupant is reduced, the material grade of the parts is increased, and the weight and cost of the electric vehicle are significantly increased.

The utility model discloses a working process does: when the automobile is subjected to side collision, external force is transmitted to the upper connecting piece 10 and the lower connecting piece 17 from the B column inner plate 8 and the doorsill inner plate 7. The upper connecting member 10 is connected to the cross member body 91, the lower connecting member 17 is connected to the longitudinal member 11, and the cross member body 91 and the longitudinal member 11 are connected by the floor 14. The external force is transmitted to the floor cross member 9 and the longitudinal member 11 from the upper and lower connecting members. Because the upper connecting piece 10 is obliquely and upwards arranged from inside to outside and the lower connecting piece 17 is obliquely and downwards arranged from inside to outside, the upper connecting piece 10 and the lower connecting piece 17 form force transmission paths L1' and L2 in two different directions, the two forces can form a resultant force along the direction of the floor cross beam 9, so that the floor cross beam 9 can crush without bending deformation, the energy can be absorbed to the maximum extent, the inward invasion degree of the structure is reduced, the longitudinal beam 11 is ensured not to extrude the surface of the battery 13 inwards, and the safety of the battery 13 is ensured.

To sum up, the embodiment of the utility model provides a car B post lower clutch structure and electric automobile, its threshold body upwards extends has the extension, and the threshold inner panel passes through extension and B post inner panel overlap joint. The arrangement of the extension part increases the inner plate of the threshold, which is beneficial to the connection of the upper connecting piece and the inner plate of the threshold. The floor beam is connected with the extension part through an upper connecting piece, and the upper connecting piece can strengthen the connecting structure between the floor beam and the sill inner plate. When collision occurs, the upper connecting piece can effectively absorb and transmit energy transmitted from the outside during collision. Because the upper connecting piece is gradually inclined upwards from the inner side to the outer side of the automobile, the force transmission path of the B-column lower joint structure is changed, and the force received by the B-column lower joint structure can be converged to the floor beam when collision occurs. The floor beam is simultaneously acted by an upper external force and a lower external force, the two forces can form a resultant force along the direction of the floor beam, so that the floor beam can be crushed rather than bent and deformed, the energy can be absorbed to the maximum extent, the degree of inward invasion of the structure is reduced, and the safety of the battery is ensured.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.

Claims

1. A lower joint structure of a B column of an automobile is characterized by comprising a doorsill inner plate, a B column inner plate, a floor beam and an upper connecting piece,

the doorsill inner plate comprises a doorsill body extending from front to back and an extending part which is arranged at the top of the doorsill body and extends upwards, the lower end of the B-pillar inner plate is in lap joint with the extending part, the floor beam is arranged on the inner side of the doorsill inner plate, one end of the floor beam is connected with the doorsill body, and the extending part is higher than the upper surface of the floor beam;

the upper connecting piece is located above the floor beam, one end of the upper connecting piece is connected with the extending portion, the other end of the upper connecting piece is connected with the top of the floor beam, and the upper connecting piece is gradually inclined downwards from one end close to the extending portion to the other end.

2. The automobile B-pillar lower joint structure of claim 1, wherein a width of the upper joint member is gradually reduced from one end near the extension portion to the other end.

3. The lower joint structure of the B-pillar of claim 1, wherein the upper connecting member comprises a connecting member body, a first flange disposed at one end of the connecting member body, and two second flanges disposed at two sides of the bottom of the connecting member body, respectively, the first flange is connected to the extension portion, and the connecting member body and the second flange are both connected to the floor beam.

4. The automobile B-pillar lower joint structure of claim 3, wherein a welded via hole is formed in the connecting piece body, and a central axis of the welded via hole is perpendicular to a connecting surface of the floor cross member and the threshold body.

5. The automobile B-pillar lower joint structure according to claim 1, wherein the floor cross member includes a cross member body and a first connecting portion, one end of the first connecting portion is connected to the cross member body, the other end of the first connecting portion is connected to the extending portion, the other end of the upper connecting portion is connected to the top of the cross member body, and the first connecting portion is gradually inclined upward from one end close to the extending portion to the other end.

6. The automobile B-pillar lower joint structure according to claim 5, wherein a width of the first connecting portion gradually increases from one end near the extending portion to the other end.

7. The lower joint structure of a B-pillar of an automobile according to claim 6, wherein an overlapping portion is provided at an end of the first connecting portion adjacent to the extending portion, the overlapping portion being inclined gradually upward from the end adjacent to the first connecting portion to the other end, the first connecting portion being connected to the rocker body through the overlapping portion.

8. The lower joint structure of a B-pillar of a vehicle according to claim 5, further comprising a floor panel provided under the floor cross member, the floor panel including a floor body and a second connecting portion provided at one end of the floor body, a top side of the floor body being connected to a bottom side of the cross member body, one end of the second connecting portion near the extending portion being connected to the rocker body, a top side of the second connecting portion being connected to a bottom side of the first connecting portion, and the second connecting portion being gradually inclined upward from one end near the extending portion to the other end.

9. The vehicle B-pillar lower joint structure according to claim 8, further comprising a longitudinal beam extending in the front-rear direction, the longitudinal beam being provided at a position of the floor body near the second joint portion, and a top side of the longitudinal beam being connected to a bottom side of the floor body.

10. The lower joint structure of a B-pillar of an automobile according to claim 9, further comprising a lower link, one end of which is connected to the bottom of the rocker body and the other end of which is connected to the bottom side of the side member, the lower link being disposed to be gradually inclined upward from the end near the extension portion to the other end.

11. An electric vehicle, characterized by comprising a battery and the vehicle B-pillar lower-joint structure according to any one of claims 1 to 10, the battery being disposed below the vehicle B-pillar lower-joint structure.