WO2017012850A1

WO2017012850A1 - Battery arrangement in an electrically operated vehicle

Info

Publication number: WO2017012850A1
Application number: PCT/EP2016/065748
Authority: WO
Inventors: Bernd Dörrige; Kevin TORNER
Original assignee: Volkswagen Aktiengesellschaft
Priority date: 2015-07-22
Filing date: 2016-07-05
Publication date: 2017-01-26
Also published as: DE102015213860B4; DE102015213860A1

Abstract

The invention relates to a battery arrangement in an electrically operated vehicle, with a traction battery (23) which is inserted in a battery compartment which is bounded by a vehicle underbody (1), is open on the bottom side and is divided into a battery main compartment (7), which is bounded by a centre tunnel (5) integrated in the underbody (1), and into at least one battery subcompartment (9) protruding laterally from said centre tunnel in the transverse direction (y) of the vehicle, wherein a battery main segment (33) and a battery subsegment (35), which enclose at least one internal corner region (37), are arranged, in each case in a contour-matching manner, in the battery main compartment and battery subcompartment (7, 9). According to the invention, in order to increase a side impact strength of the traction battery (23) in a side crash, at least one reinforcing element (39) is provided which connects the battery main segment and/or subsegment (33, 35) to each other in a force-transmitting manner by bridging the internal corner region (37).

Description

description

Battery assembly in an electrically powered vehicle

The invention relates to a battery arrangement in an electrically operated, two-lane vehicle according to the preamble of patent claim 1.

The traction battery of an electrically operated vehicle can be arranged space-saving in a vehicle shell, originally for combustion-specific

Components of a conventional drive is designed.

From DE 10 201 1 1 15 763 A1, such a vehicle shell is known in which a generic battery assembly is installed. Accordingly, the traction battery is used in a, limited by a vehicle underbody and bottom open battery compartment. This is divided into a battery main room, which is bounded by an integrated in the subfloor, lying in a vehicle longitudinal center plane center tunnel, and in it in the vehicle transverse direction laterally projecting battery subspaces. In the battery main and subspaces each contour-matched battery main and -teilsegmente are used. Overall, the traction battery is approximately double-T-shaped, with a central, extending in the vehicle longitudinal direction battery main segment, of the four, on both sides in the vehicle transverse direction projecting battery part segments are formed in the corresponding battery subspaces below

Vehicle seats and / or a rear seat of the vehicle are arranged.

In DE 10 201 1 1 15 763 A1, the laterally projecting battery-part segments in the vehicle transverse direction do not extend directly to the laterally outer Bodenschweiler.

Rather, the battery pack segments are spaced therefrom for protection from a side impact crash, forming a deformation clearance. In the case of a side collision, for example a pile side crash, the lateral rocker is thus initially deformed into the deformation clearance, with the breakdown of crash energy, without damaging the laterally protruding battery sub-segments. However, this is accompanied by a reduction in the traction battery size, which runs counter to the range requirements of the electrically powered vehicle. The object of the invention is to provide a battery assembly in an electrically powered vehicle, which is enlarged compared to the prior art and easily ensures reliable protection against a side impact.

The object is solved by the features of claim 1. preferred

Further developments of the invention are disclosed in the subclaims.

The invention is based on the fact that in the above prior art, due to the special traction battery geometry (ie the double T-shape) in the pile side crash, buckling / bending of the traction battery may occur about a vertical axis, resulting in battery damage. Damage leads. Against this background, according to the characterizing part of claim 1 to increase the side impact resistance of the traction battery, at least one stiffening element is provided, which force-transmitting the battery main and / or sub-segments while bridging an intermediate Inneneckbereiches

connects with each other. The stiffening element provides an additional force path in the side collision case, can be introduced via the impact forces and transferred to the crash-facing vehicle side, thereby increasing the side impact resistance of the traction battery.

Due to the increased side impact strength can - in comparison to the above-mentioned prior art - to dispense with the provision of a deformation clearance between the laterally projecting battery part segments and the lateral outer vehicle floor sills. The battery sub-segments of the traction battery can therefore - be brought up to the immediate side of the floor - in contrast to the above prior art. In this way, the traction battery size is increased, resulting in a larger vehicle range compared to the prior art, and also meets current crash requirements.

In a technical implementation, the stiffening element can exemplify a

Have stiffening strut, which connects the battery main and / or partial segments like a truss. Alternatively or additionally, the stiffening element may comprise a flat shear field element, which bridges the inner corner region of the traction battery substantially closed area. With regard to a good introduction of force in the side collision case, it is preferred if the stiffening element is constructed both with the stiffening strut and with the sliding field element. The shear field element may thus be preferred extend over the entire surface between the stiffening strut and the battery main and / or part segments.

Taking advantage of the installation space conditions in the vehicle shell, the traction battery can have a total of four battery subsegments in addition to the battery main segment elongated along the vehicle central longitudinal axis. These protrude mirror-inverted on both sides from the central battery main segment. The battery sub-segments can be arranged space-wise below vehicle seats and / or a rear seat, resulting in a top view of a double-T shape of the traction battery.

The traction battery may include a battery case in which battery cell packs are disposed. The battery housing can in turn be composed of a bottom-side lower shell and a top-side upper shell. For further stiffening, the battery housing may have frame-shaped circumferential support profile parts, which are attached to the outside of the lower shell, for example. Preferably, both the support profile parts and the stiffening struts are part of the above-mentioned framework structure. In the truss structure, the support profile parts and the stiffening struts can converge force-transmitting at corresponding junctions. To further increase the

Side impact resistance can be clearances between the supporting profile parts and the

Be stiffening struts bridged closed area by means of the shear field elements.

The at least one stiffening element can be a separate attachment which can be mounted on the traction battery and can be retrofitted if necessary. Alternatively, the stiffening element may be a unitary and / or integral part of the

Battery housing, ie be integrated on its lower shell or its upper shell.

As mentioned above, the battery main and subspaces are limited by the vehicle floor panel. By way of example, the at least one battery subspace can be replaced by one in the

Vehicle floor panel formed, downwardly open receiving tray be limited. The receiving tray can connect laterally outward directly to the center tunnel. On the upper shell bottom of the receiving tray, a vehicle seat / a rear seat is supported.

The upper tray bottom of the receiving tray can pass in the vehicle longitudinal direction at a Fußraumbegrenzungswand stepwise into a vertically downwardly offset footwell floor. Taking advantage of this bottom plate geometry, the height of the in Battereileil- or -hauptraum arranged support profile parts or stiffening elements are greater than the height of the outside of Batterieteil- or -hauptraumes arranged

Support profile parts or stiffening elements, which run below the Fußraumbodens.

This is under efficient use of the given space conditions the

Side impact resistance of the traction battery increased. The stiffening element can also run with a clearance spaced below the vehicle floor panel, that is functionally independent of the floor panel.

The advantageous embodiments and / or further developments of the invention explained above and / or reproduced in the subclaims can be used individually or in any combination with one another, except, for example, in cases of unequivocal dependence or incompatible alternatives.

The invention and its advantageous embodiments and / or developments and their advantages are explained below with reference to drawings.

Show it:

Figure 1 is a top view of an overview sketch on a vehicle floor panel with dashed lines indicated outer contour of a two-lane, electrically powered vehicle.

2 to 4 are each partial sectional views along the sectional planes l-l, II-II and III-III of FIG. 1;

Fig. 5 is a perspective view of a traction battery in isolation.

In Fig. 1, a vehicle floor panel 1 of an electrically driven, two-lane motor vehicle is shown from above, while the outer contour of the vehicle is indicated only by dashed lines. The floor panel 1 is shown greatly simplified with a view to a simple understanding of the invention. Thus, the bottom plate 2 in the vehicle transverse direction y laterally opposite Bodenschweiler 3 and in the vertical direction z downwardly open center tunnel 5, which extends centrally in the vehicle longitudinal direction x. Of the

Center tunnel 5 defines an elongated battery main space 7 in the vehicle longitudinal direction x (FIG. 2), which is laterally widened on both sides with battery subspaces 9 in the vehicle transverse direction y. 2, the battery compartment 9 is limited by a formed in the vehicle floor panel 1, downwardly open front receiving tray 1 1. On the upper shell bottom 13 (FIGS. 2 to 4), a vehicle seat 15 indicated in FIG. 3 can be positioned. The indicated in Fig. 3 vehicle seat 15 is above seat rails 17 on the bottom of the tray 13 of

Shelf 1 1 supported. On the rear in the vehicle longitudinal x

Receiving tray 1 1 can contrast be positioned a rear seat, not shown. As is apparent from Fig. 3, the upper tray bottom 13 of the receiving tray 1 1 in the vehicle longitudinal direction x forward and backward at an approximately vertical

Fußraumbegrenzungswand 19 extended with a footwell 21, which is offset from the upper tray bottom 13 vertically downwards.

In the battery main and -teilräumen 7, 9, a traction battery 23 is used, which is shown in FIG. 5 alone. Accordingly, the traction battery 23 on an outside battery case 25, which consists of a lower shell 27 and an upper shell 29th

is composed. In the battery case 25 are in a conventional manner

Battery cell packs 31 stacked.

As is apparent from Fig. 5, the basic shape of the traction battery 23 in a view from above viewed in approximately a double-T-shape, with a central elongate battery main segment 33, which is positioned in the installed position in the corresponding battery main compartment 7, and in four mirror images of each on both sides

Batterieteiisegmenten 35 are formed, which are positioned in the battery subspaces 9. Due to the above-mentioned double-T-shape of the traction battery 23, inner corner areas 37 (FIG. 5) emerge between the battery part and main segments 33, 35, respectively. These are each bridged in FIG. 5 by stiffening elements 39 in order to increase the side impact resistance. The stiffening elements 43 are spaced in the assembly position via a clearance f (Fig. 3 or 4) from the vehicle floor panel.

According to FIG. 5, the battery housing 25 is additionally stiffened on its lower shell 27 by frame-shaped circumferential support profile parts 41. The support profile parts 41 follow in Fig. 5 substantially the double-T shape of the traction battery 23rd

As is further apparent from Fig. 5, the stiffening elements 39 are each made

Stiffening struts 43 and shear field elements 45 constructed. The stiffening struts 43 and the housing-side support profile parts 41 run at junctions K to form a Truss structure force-transmitting together. In contrast, the shear field elements 45 extend closed surface and force transmitting between the support profile parts 41 and the stiffening struts 43rd

2 to 5 forms the lower shell 27 of the traction battery 23 together with the circumferential support profile parts 41 and the sliding field elements 45 and the

Stiffening struts 43 a one-piece unit. Instead, the

Reinforcement elements 39 may also be separate attachments, which may optionally be retrofitted to an already installed traction battery 23. The traction battery 23 is mounted on connection points, not shown, on the underside of the vehicle floor panel 1.

In Fig. 3 vary the heights hi, h _{2 of} the supporting profile parts 41 and the reinforcing struts 43. Thus, taking advantage of the space conditions, the height hi of the battery compartment or - main room 7, 9 arranged support profile parts 41 or stiffening elements 39 is greater than the height h ₂ of the battery rooms 7, 9, that is, for example, below the footwell 21 extending support profile parts 41 or stiffening elements 43.

By the means of the stiffening elements 39 increased side impact strength of

Traction battery 23, the laterally projecting battery subspaces 9 can be brought up directly to a vehicle longitudinal member 47 (Fig. 2) and the Bodenschweiler 3, without the interposition of an additional deformation clearance, as is the case in DE 10 201 1 1 15 763 A1 , In this way, the battery subspaces 9 in the

Vehicle transverse direction can be viewed enlarged, whereby the battery size increases. In one, in the Fig. 1 indicated pile side crash are by means of the additional

Stiffening elements 39 additional power paths provided with the help of the

Side impact forces largely without damaging the traction battery 23 for

Crash-facing side of the traction battery 23 can be transferred.

Claims

claims

1 . Battery assembly in an electrically powered vehicle, with a traction battery (23) which is inserted in a, from a vehicle underbody (1) limited, bottom open battery compartment in a battery main compartment (7) of a in the

Subfloor (1) integrated central tunnel (5) is limited, and in at least one of them in the vehicle transverse direction (y) laterally projecting battery part space (9) is divided, wherein in the battery main and -teilräumen (7, 9) each contour-matched

Battery main segment (33) and a battery part segment (35) are arranged, which include at least one Inneneckbereich (37), characterized in that to increase a side impact resistance of the traction battery (23) in a side crash at least one stiffening element (39) is provided, the battery main - And / or - partial segments (33, 35) bridging the Inneneckbereiches (37) force-transmitting interconnects.

2. Battery arrangement according to claim 1, characterized in that the

Stiffening element (39) has a stiffening strut (43) which connects the battery main and / or sub-segments (33, 35) with each other like a truss.

3. Battery arrangement according to claim 1 or 2, characterized in that the

Stiffening element (39) has a shear field element (45) which bridges the Inneneckbereich (37) of the traction battery (23) substantially closed area, and in particular the thrust field element (45) over the entire surface between the stiffening strut (43) and the Batteriehaupt- and / or Partial segments (33, 35) extends.

4. Battery arrangement according to claim 1, 2 or 3, characterized in that the

Traction battery (23) has a total of four on both sides in the vehicle transverse direction (y) of the battery main segment (33) projecting battery part segments (35), which are arranged in corresponding battery subspaces (7, 9) below vehicle seats (15) and / or a rear seat.

5. Battery arrangement according to one of the preceding claims, characterized

in that the traction battery (23) has a battery housing (25) in which battery cell composites (31) are arranged, and in that the battery housing (25) has a bottom-side lower shell (27Q and a top-side upper shell (29), and in particular that the stiffening element (39) is integrated in the lower shell (27) or upper shell (29) in the same material and / or in one piece.

6. Battery arrangement according to one of the preceding claims, characterized

characterized in that the stiffening element (39) is a separate attachment which can be mounted on the traction battery (23).

7. Battery arrangement according to one of the preceding claims 5 or 6, characterized

characterized in that for reinforcing the traction battery (23), the battery housing (25) has frame-shaped encircling support profile parts (41), and in particular that the support profile parts (41) and the stiffening strut (43) merge force-transmitting at nodes (K), and / or that the thrust field element (45) force-transmitting between the support profile part (41) and the stiffening strut (43).

8. Battery arrangement according to one of the preceding claims, characterized

in that the battery part space (9) is delimited by a shell (11) formed in the vehicle floor panel (1) whose upper shell bottom (13) is stepped in a vertical manner in the vehicle longitudinal direction (x) on a foot space boundary wall (19) downwardly displaced footwell floor (21) merges, and that taking advantage of the installation space, the height (hi) of the Battereileil- or - main room (7, 9) arranged support profile parts (41) or stiffening elements (39) is greater than the overall height (h ₂ ) arranged below the footwell (21), that is, outside the Batterieteil- or -hauptraumes (7, 9), arranged supporting profile parts (41) or

Stiffening elements (39).

9. Battery arrangement according to one of the preceding claims, characterized

characterized in that the stiffening element (39) with a clearance (f) spaced below the vehicle floor panel part (1) is arranged.