DE102018214109A1 - Body structure for an electrically powered vehicle - Google Patents

Abstract

The invention relates to a body structure for an electrically operated vehicle with an assembly space (29) for a traction battery (9; 35), wherein in a first vehicle variant (I) a first traction battery (9) with a large battery housing (17) in the assembly space (29) is arranged and is connected on the body side, the large battery housing (17) acting as a stiffening element which stiffens the body structure during normal driving and / or in the event of a crash. According to the invention, in a second vehicle variant (II), a second traction battery (35) with a battery housing (37) that is small compared to the first traction battery (9) is arranged in the assembly space (29) and connected on the body side, to be precise not forming a small battery housing (37 ) occupied space (39). An additional stiffening element (43) is installed in the empty space (39), by means of which the body rigidity is increased during normal driving and / or in the event of a crash.

Description

The invention relates to a body structure for an electrically operated vehicle according to the preamble of claim 1 and a method for producing vehicle variants with different ranges.

In an electrically operated, two-lane vehicle, a traction battery can be installed in the vehicle floor and extend in the transverse direction of the vehicle between the side sills of the vehicle, which limit the side door openings of the vehicle body on the floor side.

A generic body structure has an assembly space in which the traction battery is arranged and connected on the body side. In this case, the battery housing acts as a stiffening element that stiffens the body structure during normal driving and / or in the event of a crash.

To implement electrically operated vehicle variants with different ranges, either a more powerful traction battery (with a larger battery cell packing density) or a less powerful traction battery (with a reduced battery cell packing density) can be installed in the body structure. In the prior art, both the more powerful traction battery and the less powerful traction battery each have identical battery housings. In this way, traction batteries of different power levels can be installed in identical body structures. Therefore, in the state of the art, a common body structure for both the more powerful traction battery and the less powerful traction battery can easily be provided in terms of production technology.

In the above procedure, the less powerful traction battery therefore has a battery housing that is actually designed (and therefore oversized) for the more powerful traction battery. Such an oversized battery housing is associated with an increased component weight and increased manufacturing costs.

From the DE 10 2011 100 323 A1 a vehicle body with a support structure is known. From the DE 10 2015 213 860 A1 a battery arrangement in an electrically operated vehicle is known.

The object of the invention is to provide a body structure for an electrically operated vehicle, in which a more powerful battery can be installed for a first vehicle variant and a less powerful traction battery for a second vehicle variant, with a reduced component weight compared to the prior art as well as reduced manufacturing costs ,

The object is solved by the features of claim 1. Preferred developments of the invention are disclosed in the subclaims.

In the body structure according to the invention, in a first vehicle variant, a first, more powerful traction battery with a large battery housing can be arranged in the assembly space and connected on the body side. Alternatively, for a second vehicle variant, a second, less powerful traction battery can be arranged in the assembly room and connected on the body side. The second, less powerful traction battery has a small battery housing compared to the first traction battery. In the assembled state of the second vehicle variant, this leaves an empty space not occupied by the small battery housing in the body-side assembly space. According to the invention, an additional stiffening element is installed in the empty space that remains free in the second vehicle variant. The additional stiffening element increases the body rigidity of the second vehicle variant in normal driving and / or in the event of a crash.

In a technical implementation, the small battery housing with the additional stiffening element can be extended, by bridging the empty space between the small battery housing and a connection point on the body side. The additional stiffening element can either be made of the same material and / or be formed in one piece on the small battery housing. Alternatively, the additional stiffening element can also be mounted as a separate component on the small battery housing.

In view of an increased body rigidity both in normal driving and in the event of a crash, it is preferred if the additional stiffening element is a flat thrust plate part. The additional stiffening element can be constructed from a number of truss-like struts. As an alternative to this, the additional stiffening element can also be exactly a flat thrust plate part which covers the empty space in a horizontal plane in a closed area.

To provide the largest possible assembly space, it is preferred if it is formed in the vehicle floor. In this case, the mounting space on the floor side can be limited in the vehicle longitudinal direction to the front and to the rear by a front cross member and by a rear cross member. In the In the transverse direction of the vehicle, the floor-side assembly space can be delimited by side sills, which each limit the side door openings on the floor side. In the vehicle vertical direction upwards, the assembly space can be delimited by a large floor panel part. In this case, the traction battery is inserted in a sequence of assembly from the bottom of the vehicle into the floor-side assembly space, which is open to the bottom of the vehicle. The traction battery is then attached to the body structure, preferably via screw connections.

In the second vehicle variant, instead of the more powerful traction battery with a large battery housing, the less powerful second traction battery with a small battery housing is installed in the body structure. It is preferred if, in the second vehicle variant, the empty space is limited in the vehicle longitudinal direction between the small battery housing and the rear cross member and in the vehicle transverse direction between the two side sills. In this case, the center of gravity (compared to the first vehicle variant) shifts to the front of the vehicle. Such a center of gravity shifted to the front of the vehicle is advantageous with regard to the driving properties of the vehicle.

To further increase the body rigidity of the second vehicle variant, it is preferred if the additional stiffening element is arranged in the vehicle vertical direction by a free height offset below the floor panel part. In this way, a closed, component-stiff hollow profile can be formed between the rear of the small battery housing, the base plate part, the rear cross member and the two sills.

In the first vehicle variant, the more powerful first traction battery with a correspondingly large battery housing is installed in the body structure. In this case, the large battery housing is connected to a plurality of body-side connection points, which are each formed on the front and rear cross members and on the sills. In the second vehicle variant, on the other hand, the small battery housing is not connected to all body-side connection points, but only to a first part of it. In contrast, the additional stiffening element is connected to the remaining second part of the body-side connection points.

With the above-mentioned installation of the traction battery in the vehicle floor, the profile floors of the front and rear cross members and the sills each form a screw-on base for connecting the battery housing. The respective battery housing can have a housing flange with screw holes that preferably runs in a horizontal plane. In the assembled position, these are each aligned with a corresponding profile base screw hole and penetrated by a screw bolt. The battery housing is clamped to the respective profile base with the respective screw bolt.

The screw holes of the large battery housing used for connection to the vehicle body are positioned in a first hole pattern. In contrast, the screw holes of the small battery housing and of the additional stiffening element used for connection to the vehicle body are positioned in a second hole pattern. For a simplified assembly of the first and second vehicle variants, it is preferred if the first and second hole patterns are designed identically.

An exemplary embodiment of the invention is described below with reference to the attached figures.

• 1 in einer perspektivischen Teilraumansicht eine Karosseriestruktur eines Kraftfahrzeugs;
• 2 eine Teilschnittdarstellung entlang einer Schnittebene yz aus der 1;
• 3 in einer Ansicht von unten die Karosseriestruktur gemäß einer ersten Fahrzeugvariante, in der eine leistungsstärkere Traktionsbatterie mit großem Batteriegehäuse verbaut ist;
• 4 eine perspektivische Teilraumansicht der ersten Fahrzeugvariante entlang einer Schnittebene xz aus der 3;
• 5 und 6 jeweils Ansichten entsprechend der 3 und 4 einer zweiten Fahrzeugvariante.

Show it:

• 1 in a perspective partial space view of a body structure of a motor vehicle;
• 2 a partial sectional view along a section plane yz from the 1 ;
• 3 in a view from below the body structure according to a first vehicle variant, in which a more powerful traction battery with a large battery housing is installed;
• 4 a perspective partial view of the first vehicle variant along a section plane xz from the 3 ;
• 5 and 6 views corresponding to the 3 and 4 a second vehicle variant.

In the 1 A body structure of a two-lane motor vehicle is shown, which is described below insofar as is necessary for an understanding of the invention. As a result, the body structure has a bottom side sill 1 on, which is in the vehicle longitudinal direction x between a front A-pillar 3 and a rear C-pillar 5 extends and side door openings 7 limited on the bottom. There is a crash-sensitive traction battery in the vehicle floor of the body structure 9 installed. This is below a floor panel part 10 positioned and extending in the vehicle transverse direction y between the two sills 1 as it is in the 3 is shown. The traction battery extends in the longitudinal direction of the vehicle 9 between a front cross member 11 and a rear cross member 13 ,

In the 2 is the sill 1 formed as a hollow beam, with a sill inner part in the vehicle transverse direction y 12 and a sill outer part in the vehicle transverse direction y 14 , These limit a sill cavity. Inside is a deformation element designed as an extruded aluminum profile, for example 24 arranged. The sill 1 has a profile floor 15 on, together with other profile floors 15 the front and rear cross members 11 . 13 a screw-on base for the traction battery 9 forms. As a result, is a battery case 17 the traction battery with one in a horizontal plane x . y circumferential housing flange 19 trained who in the 2 a screw hole 21 having. In the, in the 2 Assembly position shown is the housing flange screw hole 21 in line with a corresponding profile bottom screw hole 23 arranged. The two screw holes 21 . 23 are from a bolt 25 interspersed with one on the profile floor 15 welded weld nut 27 is screwed. During an assembly process, the traction battery is first 9 in a joining direction from the vehicle below into an assembly room 29 used by the front and rear cross members 11 . 13 , the side sills 1 and the floor panel part 10 is defined. Then the housing flange 19 the traction battery 9 on the profile bases of the cross beams 11 . 13 as well as the sill 1 screwed. The sweat nut 27 forms together with the profile base screw hole 23 a body-side connection point A ( 2 ).

In the 3 is a view of the body structure according to a first vehicle variant I shown from below, by means of which a large range can be provided. The battery housing is corresponding 17 large size to accommodate a large number of high density battery cells to provide increased performance. The large battery case 17 the traction battery 9 fills the floor mounting space 29 the body structure almost completely.

Accordingly, in the 4 the battery case 17 with its back 31 right up to a front profile flank 33 of the rear cross member 13 introduced. The battery case is the same 17 with its front, not shown, right up to a rear profile flank of the front cross member 15 introduced. The housing flange 19 of the large battery case 17 under the profile floor 15 of the rear cross member 13 and is at its body-side connection points A tightened.

The difference is in the 5 a second vehicle variant II shown, whose body structure is identical to the body structure of the first vehicle variant I is. In contrast to the first vehicle variant I is in the 5 a less powerful traction battery 35 with a smaller battery case 37 in the assembly room 29 installed. Because of the large battery case compared to the 17 reduced space requirement of the smaller battery housing 37 does not result from the small battery case 37 occupied space 39 ( 6 ). The white space 39 is in the 6 between the back 41 of the small battery case 37 and the front profile flank 33 of the rear cross member 13 limited in the vehicle longitudinal direction x. In the vehicle transverse direction y is the empty space 39 between the two sills 1 limited and by the floor panel part to the top of the vehicle 10 limited.

According to the 5 or 6 is in the white space 39 as an additional stiffening element, a flat thrust plate part 43 assembled. The thrust plate part 43 extends in a horizontal plane xy and covers the empty space 39 closed area. In addition, the thrust plate part 43 by a free height offset Δz ( 6 ) below the floor panel part 10 arranged, which creates a rigid, closed hollow profile between the battery housing rear 41 , the floor panel part 10 , the rear cross member 13 as well as the two sills 1 results.

The flat thrust plate part 43 is designed as a separate component that is attached to screw points 45 on the circumferential housing flange 19 of the small battery case 37 is mounted.

The screw holes 21 of the large battery case 17 ( 3 ) are in a first hole pattern L1 positioned and all with corresponding body-side connection points A screwed. In the same way form in the 5 that for connection to the body-side profile floors 15 used screw holes 21 of the small battery case 37 and the thrust plate part 43 a second hole pattern L2 , The two hole patterns L1 . L2 are identical to each other to facilitate an assembly process.

According to the 5 is the push plate part 43 both on the small battery case 37 , on the two sills 1 as well as on the rear cross member 13 via screw points 45 as well as via body-side connection points A attached. In this way, the body stiffness is increased both in normal driving and in the event of a side crash.

LIST OF REFERENCE NUMBERS

1

sill

3

A column

5

C-pillar

7

Side door opening

9

more powerful traction battery

10

Bottom plate part

11

front cross member

12

Rocker inner part

13

rear cross member

14

Rocker outer part

15

Duct floor

17

large battery case

19

housing flange

21

Mounting Ring Screw Hole

23

Profile base screw hole

24

deformation element

25

bolts

27

weld nut

29

mounting space

31

Battery case back

33

front profile flank of the rear cross member 13

35

less powerful traction battery

37

smaller battery case

39

whitespace

41

Battery case back

43

Thrust sheet metal part

45

screw locations

A

Body-side connection points

I

first vehicle variant

II

second vehicle variant

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102011100323 A1 [0006]
• DE 102015213860 A1 [0006]

Claims (10)

Body structure for an electrically operated vehicle with a mounting space (29) for a traction battery (9; 35), a first traction battery (9) with a large battery housing (17) being arranged in the mounting space (29) and on the body side in a first vehicle variant (I) is connected, the large battery housing (17) acting as a stiffening element that stiffens the body structure during normal driving and / or in the event of a crash, characterized in that in a second vehicle variant (II) a second traction battery (35) is used in comparison to the first Traction battery (9) small battery housing (37) is arranged in the assembly space (29) and connected on the body side, namely to form an empty space (39) not occupied by the small battery housing (37), and that an additional stiffening element (39) 43) is installed, by means of which the body rigidity is increased during normal driving and / or in the event of a crash. Body structure after Claim 1 , characterized in that the small battery housing (37) with the additional stiffening element (43) is extended, namely by bridging the empty space (39) between the small battery housing (37) and a body-side connection point (A), and / or that the additional stiffening element (43) is made of the same material and / or in one piece with the small battery housing (37), or that the additional stiffening element (43) can be mounted as a separate component on the small battery housing (37). Body structure after Claim 1 or 2 , characterized in that the additional stiffening element (43) is a flat thrust plate part which covers the empty space (39) in a horizontal plane (xy) over the entire surface. Body structure according to one of the Claims 1 . 2 or 3 , characterized in that the assembly space (29) is formed in the vehicle floor, and / or in that the assembly space (29) in the vehicle longitudinal direction (x) bounded forwards and backwards by a front cross member (13) and a rear cross member (15) is delimited on both sides in the vehicle transverse direction (y) by sills (1) which delimit the side door openings (7) on the floor side, and is delimited in the vehicle vertical direction (z) upwards by a floor panel part (10). Body structure after Claim 4 , characterized in that in the second vehicle variant (II) the empty space (39) in the vehicle longitudinal direction (x) between the small battery housing (37) and the rear cross member (13) is limited, and in the vehicle transverse direction (y) the empty space ( 39) between the two sills (1) is limited. Body structure according to one of the Claims 4 or 5 , characterized in that the additional stiffening element (43) is arranged in the vehicle vertical direction (z) by a free height offset (Δz) below the floor panel part (10), in particular with the formation of a closed hollow profile between the small battery housing (37), the floor panel part (10), the rear cross member (13) and the sills (1). Body structure according to one of the preceding claims, characterized in that in the first vehicle variant (I) the large battery housing (17) is connected to body-side connection points (A), and in the second vehicle variant (II) the small battery housing (37) is connected to one the first part of the body-side connection points (A) is connected and the additional stiffening element (43) is connected to a second part of the body-side connection points (A). Body structure according to one of the Claims 4 to 7 , characterized in that the front and rear cross members (11, 13) and the sills (1) each have vehicle bottoms (15) below, which form a screw-on base for connecting the respective battery housing (17, 35). Body structure after Claim 8 , characterized in that the battery housing (17, 37) has a housing flange (19) with screw holes (21) which, when assembled, are each aligned with a corresponding profile base screw hole (23) and are penetrated with a screw bolt (25) , with which the battery housing (17, 37) is clamped to the profile base (15). Body structure after Claim 9 , characterized in that the screw holes (21) of the large battery housing (17) are positioned in a first hole pattern (L1), and that the screw holes (21) of the small battery housing (27) and the Additional stiffening element (43) are positioned in a second hole pattern (L2), and that the first and second hole patterns (L1, L2) are identical.

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