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Title:
BATTERY STRUCTURE AND PROTECTOR
Document Type and Number:
WIPO Patent Application WO/2018/149762
Kind Code:
A1
Abstract:
The invention relates to a battery structure (1) for an electric vehicle. The battery structure (1) comprises a battery case (2) for at least one battery module (3 ) and a protector (4) comprising a top belt (5 ), a bottom belt (6) and a core (7) arranged between and interconnecting the top belt (5) and the bottom belt (6). The top belt (5) has a wavelike cross section.

Inventors:
SPIELVOGEL, Bernhard (Grubedt 11, 5271 Moosbach, 5271, AT)
SCHMITZ, Sebastian (Schiffmanngasse 15, 5020 Salzburg, 5020, AT)
INSAM, Guido (Wagnitzerstrasse 26, 8401 Kalsdorf, 8401, AT)
DORFINGER, Herbert (Gassen 11, 4893 Zell am Moos, 4893, AT)
Application Number:
EP2018/053354
Publication Date:
August 23, 2018
Filing Date:
February 09, 2018
Export Citation:
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Assignee:
MUBEA CARBO TECH GMBH (Eugen-Müller-Strasse 16, 5020 Salzburg, 5020, AT)
International Classes:
B60K1/04; B60K1/00; B60L11/18; H01M10/613
Domestic Patent References:
WO2015077000A12015-05-28
Foreign References:
CN103730616A2014-04-16
EP2910394A12015-08-26
EP2623353A12013-08-07
DE102012017879A12014-03-27
US20150135940A12015-05-21
DE102010024320A12011-12-22
DE102015101096A12016-07-28
FR2977554A12013-01-11
Attorney, Agent or Firm:
RENTSCH PARTNER AG (Bellerivestrasse 203, Postfach, 8034 Zürich, 8034, CH)
Download PDF:
Claims:
PATENT CLAIMS

1. Battery structure ( 1 ) for an electric vehicle comprising a. a battery case (2) for at least one battery module (3 ) and b. a protector (4) comprising i. a top belt (5) ii. a bottom belt (6) and iii. a core (7) arranged between and interconnecting the top belt (5) and the bottom belt (6), wherein c. the top belt (5) has a wavelike cross section.

The battery structure ( 1 ) according to claim 1 , wherein the wavelike cross- section of the top belt ( 5) extends in longitudinal (x) and/or transversal (y) direction of the electric vehicle.

3. The battery structure ( 1 ) according to one of the previous claims, wherein the top belt (5) is interconnected to at least longitudinal and/or at least one transversal beam (8, 9) of the battery case (2).

4. The battery structure ( 1 ) according to one of the previous claims, wherein the top belt (5) is interconnected to a frame ( 1 0) of the battery case (2 ).

5. The battery structure ( 1 ) according to claim 3 or 4, wherein the top belt (5) is interconnected to at least longitudinal and/or at least one transversal beam (8, 9) and/or the frame ( 1 0) of the battery case (2) across a lower sled wall ( 1 5 ) of the battery case ( 2 ) .

6. The battery structure ( 1 ) according to one of the previous claims, wherein the top belt ( 5) comprises elevations ( 1 1 ) and thereto alternating depressions ( 1 2).

7. The battery structure ( 1 ) according to claim 6, wherein the top belt (5) in the area of at least one depression ( 1 2) is directly interconnected to the bottom belt (6).

8. The battery structure ( 1 ) according to claim 7, wherein the top belt (5) in the area of at least one depression ( 1 2) is directly connected to the bottom belt (6).

9. The battery structure ( 1 ) according to claim 7 or 8, wherein the top belt (5) in the area of at least one depression ( 1 2) is indirectly connected to the bottom belt (6) via the core (7).

10. The battery structure ( 1 ) according to one of the previous claims, wherein the core (7 ) is a honeycomb and/or a foam.

1 1. The battery structure ( 1 ) according to one of the previous claims, wherein the core (7) is made from an isolating material. 12. The battery structure ( 1 ) according to one of the previous claims, wherein at least one of the depressions ( 1 2 ) is used for conveying of a fluid for cooling and/or heating of the at least one battery module.

13. Protector for a battery structure according to one of the previous claims.

Description:
BATTERY STRUCTURE AND PROTECTOR

FIELD OF THE INVENTION

The present invention relates to a battery structure for an electric vehicle and a protector for a battery pack.

BACKGROUND OF THE INVENTION

DE10201 5101096A1 was first published in July 201 6 in the name of Porsche AG. It relates to a battery structure. The battery facilities includes an underbody battery between a bottom plate and a floor. At least one deformation zone is foreseen to avoid unwanted damage to a battery of the underbody. The deformation zone so is below the battery facilities. The bottom plate can deform upwards.

W01 5077000A1 was first published in May 201 5 in the name of Atieva Inc. It relates to a battery pack protection system for use with an electric vehicle in which the battery pack is mounted under the car. The system utilizes a plurality of deform- able cooling conduits located between the lower surface of each of the batteries and the lower battery pack enclosure panel. A thermal insulator is interposed between the conduits and the lower enclosure panel. A layer of thermally conductive material may be included which is interposed between the cooling conduits and the thermal insulator and in contact with a lower surface of each of the cooling conduits. The cooling conduits are configured to deform and absorb impact energy when an object, such as road debris, strikes the lower surface of the lower battery pack enclosure panel. Further protection may be achieved by positioning a ballistic shield, alone or with a layer of compressible material, under the bottom surface of the battery pack.

FR2977554A was first published in January 201 3 in the name of Fior Concept. It relates to a vehicle having a frame which comprises a honeycomb shaped structure that forms a plate. A surface of an upper plate is rigidly connected to an upper surface of the plate. A surface of a bottom plate is rigidly connected to a lower surface of the plate. Resistant structures are protruded above a wheel notch and attached with the notch by a complete and rigid connection. An external resistant belt is attached with an external circumference of the plate by the complete and rigid connection and placed partially between the structures of passages of the wheels.

SUMMARY OF THE INVENTION

From the prior art parts for the protection of in the vehicle floor arranged battery packs are known which often absorb the occurring energy by plastic deformation over a relatively large deformation path. The protectors known from the prior art are either made from metal or composite material and are not appropriate for absorbing high punctual impact loads. One disadvantage of the systems known from the prior art is that a significant amount of space between the underride protection and the parts to be protected is consumed as the structure used to fulfill the requirements, i.e. depleting of the introduced energy without significant introduction of forces into the parts to be protected. Depending on the type of vehicle this can have a significant impact on at least one of the following parameters: Ground clearance, access height, head clearance, vehicle height, cross-sectional area.

Therefore, it is an object of the invention to provide an improved protector for a battery structure which offers better performance for protecting of a battery structure in an underfloor of an electric vehicle, namely high local stress, e.g. due to impact by an immersible traffic bollard. It is a further object to provide a protector which is lighter and needs less space in height direction to deplete the occurring energy by elastic and/or plastic deformation.

The protector according to the invention helps to prevent damage of at least one battery module arranged in an underfloor of an electric car. The protector normally comprises a top belt and a bottom belt and a there between arranged core interconnecting the top belt and the bottom belt. The top belt preferably has a waveform in at least one direction. Depending on the field of application, the waveform may extend in two directions arching from one beam to another beam effectively receiving and distributing high local load as described hereinafter in more detail. The protector according to the invention offers optimized distribution of the occur- ring energy into the structure by a combination of elastic and/or plastic deformation. The top belt and the bottom belt, as well as the there-between arranged core, are preferably made from at least one out of the following group of materials: Aluminum, steel, fiber reinforced composite material, thermoplastic material. In a preferred variation the top belt is made from aluminum and/or steel and/or thermoplastic material comprising short fibers, while the bottom belt is preferably made from fiber reinforced composite material comprising continuous fibers. The core is preferably made from honeycomb and/or foam. Depending on the field of application, other combinations can be used. A preferred selection of parameters to optimize the structure are: Shape of the cross-section of the wave, shape (curvature) of the wave, core material, chamber height, wall thickness, belt material.

In a preferred variation the battery structure for an electric vehicle comprises a battery case encompassing at least one battery module and a protector. The protector comprises a top belt and a bottom belt and a core arranged between and interconnecting the top belt and the bottom belt. The top belt preferably has a wavelike cross section extending in at least one direction. The wavelike cross-section of the top belt may extend in longitudinal and/or transversal direction of the electric vehicle resulting in a wavelike top belt, wherein the waves extend in one and /or two directions simultaneously. The waves can be regular or irregular. The waves of the top belt can extend in two directions if appropriate. The protector is preferably interconnected to at least longitudinal and/or at least one transversal beam of the battery case. In a variation the longitudinal and the transversal beams are arranged grid-like. The top belt can be interconnected to a frame of the battery case. The protector is preferably arranged below a lower sled wall of the battery case housing the at least one battery module inside. One aim is that the risk that an impacting object can reach the lower sled wall is significantly reduced.

The top belt comprises, with respect to the core, elevations (thicker areas of core) and thereto alternating depressions (thinner area of core) arranged in a wavelike structure. The depressions and elevations span across the beams, respectively the frame of the battery case, in an arch-like manner resulting in a very efficient structure especially in the case of punctual loads occurring from the outside (opposite side of the protector). The top belt in the area of at least one depression can be directly interconnected to the bottom belt. The top belt in the area of at least one depression can be directly connected to the bottom belt. Alternatively or in addition the top belt can be in the area of at least one depression indirectly connected to the bottom belt, e.g. via a section of the same or a different core. Good results can be achieved if the core is a honeycomb, e.g. made from aluminum, steel or injection molded thermoplastic material, and/or a foam. The bottom belt preferably has a primarily flat structure, especially in the case that it provides the outer layer of the underfloor. Stiffening corrugations may be applied if necessary as part of the structure and/or as separate elements. The core can be made from an isolating material. If appropriate at least one of the depressions can be used for conveying of a fluid for cooling and/or heating of the at least one battery module.

It is to be understood that both the foregoing general description and the following detailed description present embodiments, and are intended to provide an overview or framework for understanding the nature and character of the disclosure. The accompanying drawings are included to pro-vide a further understanding, and are incorporated into and constitute a part of this specification. The drawings illustrate various embodiments, and together with the description serve to explain the principles and operation of the concepts disclosed.

BRIEF DESCRIPTION OF THE DRAWINGS

The herein described invention will be more fully understood from the detailed description given herein below and the accompanying drawings which should not be considered limiting to the invention described in the appended claims. The drawings are showing:

Fig. 1 a battery structure according to the invention;

Fig. 2 a longitudinal and a transversal section view across a battery case according to the invention;

Fig. 3 a first and a second embodiment of a protector in a first and in a second section view; Fig. 4 a third embodiment of a protector.

DESCRIPTION OF THE EMBODIMENTS

Reference will now be made in detail to certain embodiments, examples of which are illustrated in the accompanying drawings, in which some, but not all features are shown. Indeed, embodiments disclosed herein may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements. Whenever possible, like reference numbers will be used to refer to like components or parts.

Figure 1 shows a battery structure 1 in an exploded view from below. Figure 2a and 2b schematically show an impact of an object 1 4 into a battery structure 1 from below. Figure 3a through 3d are showing cross-section views of a first and a second variation of a protector 4 from the side an along section line A-A. Figure 4 is showing a third variation of a protector 4 in a perspective view.

As visible in Figure 1 the battery structure 1 comprises a battery case 2 for at least one battery module 3 and a protector 4. The elements are shown in a disassembled, exploded manner. Assembly is schematically indicated by dotted lines. As e.g. visible in Figures 2a and Figure 3 the protector 4 comprises a top belt 5 and a bottom belt 6 and a core 7 arranged between and interconnecting the top belt 5 and the bottom belt 6 at least in certain areas. In the shown variation the core is a honeycomb, wherein the cells of the honeycomb extend in vertical direction (z-direction). As schematically indicated in Figure 1 the protector 4, namely the top belt 5, can be interconnected to a frame 1 0 of the battery case 2.

As visible in Figure 2a the top belt 5 of the shown variation has a wavelike cross- section. The top belts 5 are interconnected to longitudinal beams 8 of the battery case 2. The top belt 5 comprises elevations 1 1 and thereto alternating depressions 1 2 forming waves 1 3, which are arranged in a regular manner. The waves 1 3 are here extending in x-direction only. Other arrangements are possible.

In the variation as shown in Figure 2a, respectively the section view according to Figure 3a, the top belt 5 in the area of the depressions 1 2 is directly interconnected to the bottom belt 6, which has an in principle flat design. As visible in the section view according to Figure 3c the top belt 5 can be alternatively or in addition in the area the depressions 1 2 indirectly connected to the bottom belt 6 via the core 7.

Figure 3b is showing a section view along section line A-A according to Figure 3a and Figure 3d is showing a section view along section line A-A according to Figure 3c

For better temperature control of the at least one battery module the core 7 can be made from an isolating material such as foam. If appropriate at least one of the depressions 1 2 is used for conveying of a fluid for cooling and/or heating of the at least one battery module

Figure 4 shows a further variation of a protector 4 in a perspective view from above. The top belt 5 has a wave-structure extending in two directions (x, y) simultane- 5 ously. The bottom belt 6 (not visible in detail) is having a flat design. Depending on the field of application other possibilities exist. In an area where the longitudinal and the transversal beams 8, 9 connect (indicated by dashed lines) the top belt 5 is having a flat design. Compared to the prior art the dome-like depressions 1 2 offer very high stiffness and energy consumption capability especially in the case of i o punctual impact loads from below 8 (z-direction).

Rather, the words used in the specification are words of description rather than limitation, and it is understood that various changes may be made without departing from the Spirit and scope of the invention.

LIST OF DESIGNATIONS

1 Battery structure

2 Battery case

3 Battery module 4 Protector

5 Top belt

6 Bottom belt

7 Core

8 Longitudinal beam 9 Transversal beam

1 0 Frame (battery case)

1 1 Elevation (top belt)

1 2 Depression (top belt)

1 3 Wave

1 4 Impacting object

1 5 Sled wall (battery case)

1 6 Cover (battery case)




 
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