DE102018110519B4 - battery box - Google Patents

Abstract

Battery box (1) for arrangement below a passenger compartment of an electric vehicle or hybrid vehicle, the battery box (1) having struts (3 - 6) which run diagonally to the vehicle longitudinal axis (LA) and to the vehicle transverse axis in order to stiffen the lower region of the passenger cell, in each case two struts (3, 4; 5, 6) run from a front and a rear frame wall (11) of the battery box (1) to a left and right frame wall (12, 13), characterized in that the struts (3, 4; 5, 6) from the center areas (14, 22) of the front and rear frame wall (10, 11) of the battery box (1) to the center areas (16, 17) of a left and right frame wall (12, 13), so that the Struts (3 - 6) are arranged in the form of a rhombus, the struts (3 - 6) being arranged on an underside (2) and / or an upper side of the battery case (1), with internal struts (23 , 24) are arranged, which are in Fahrz Extend longitudinal and / or transverse direction (LA, QA), to limit individual battery modules to be accommodated and for longitudinal and / or transverse reinforcement of an interior of the battery box (1), the frame walls (10 - 13) being L-shaped in cross section an outwardly directed horizontal leg (25) and an upwardly directed vertical leg (26), the horizontal leg (25) having stiffening impressions (18) which are arranged at least where no inner struts (23, 24) are arranged and wherein the Frame walls (10-13), the struts (3-6) and the inner struts (23, 24) are thermoformed and press-hardened or cold-formed from UHSS and / or roll-formed from UHSS.

Description

The invention relates to a battery box with the features in the preamble of claim 1.

It is known from the prior art to arrange the traction batteries for driving an electric vehicle or hybrid vehicle in battery boxes, which are arranged below the passenger compartment. These battery boxes are also called battery carriers or battery trays. The battery boxes are mostly made of metallic materials such. B. as deep-drawn components. They should be light and have a high rigidity, but at the same time cause lower production costs and also be fluid-tight in order to prevent battery fluid from leaking in the event of a crash.

In the case of a frontal impact, in conventional vehicle structure concepts, the load is transmitted solely via the sills or via a type of tunnel above the battery box. The forces are laterally transferred to the sills via the side members. This is unfavorable due to the geometric conditions, because the side members are between the wheels and the sills are further out. The side members must bend outwards and downwards in the transition area to the battery box. Bending forces act in the kink area. The side members must be designed accordingly massive. As a rule, this entails weight gain. If the forces were introduced into the center of the vehicle, the tunnel would have to absorb higher forces. However, tunnels take up a lot of space in the passenger compartment. That is undesirable.

The JP 2006 182 295 A1 discloses a battery box with an H-shaped inner support and an X-strut cross under the battery case in the load path between the front and rear side members of a car. The H-shaped longitudinal and transverse struts within the battery case created by a base plate and a cover take up a relatively large amount of installation space, so that less space is available for the battery modules.

From the GB 2 108 443 A a chassis for an electrically operated bus is known, the chassis having left and right regions. In the areas on the left and right in the direction of travel, diagonal braces are arranged above the battery box, so that a triangular bracing results.

The DE 10 2007 023 392 A1 discloses a protective housing for a vehicle battery, in which the battery is accommodated in a battery receiving space at a distance from the longitudinal beams of the motor vehicle. The protective housing arranged there is attached to the side members. In order to reduce the risk of damage to the battery in the event of a crash, at least one diagonal strut can be provided to stiffen the border. The diagonal struts extend to a front transverse wall, so that triangular stiffening areas are formed as a result.

The US 5,639,571 A discloses a battery box made by injection molding. The injection molding process enables the production of filigree structures. Glass fiber reinforced propylene is regarded as the preferred material so that the battery box is given the highest possible rigidity with a low weight.

The DE 10 2012 213 308 A1 discloses another battery box in plastic composite construction. Long fibers, continuous fibers or a mixture of long fibers and continuous fibers are to be used in particular as reinforcing fibers in the plastic matrix.

Proceeding from this, the object of the invention is to show a battery box for arrangement below a passenger compartment of an electric vehicle or hybrid vehicle, which has improved crash behavior and at the same time limits the area to be used for battery modules as little as possible.

This object is achieved in a battery box with the features of claim 1.

The subclaims relate to advantageous developments of the invention.

The battery box according to the invention for arrangement below a passenger compartment of an electric vehicle or hybrid vehicle has struts on its underside and / or on its upper side which run diagonally to the vehicle longitudinal axis and vehicle transverse axis in order to stiffen the lower region of the passenger cell of the electric vehicle or hybrid vehicle. Two struts each extend from the center areas of a front and a rear frame wall of the battery box to the center areas of a left and right frame wall of the battery box. As a result, the four struts form a diamond on the underside or on the top. This diamond-shaped arrangement of the struts is located outside the interior of the battery box. The battery box is not limited in terms of loadability with battery modules.

In addition, the diamond-shaped arrangement creates a new load path, which is cheaper than an X-shaped stiffener Battery box. The reason for this is that the frame of the battery box has left and right frame walls, over which very large forces can be transmitted in the longitudinal direction. In the event of a frontal crash, the right and left frame walls relieve the sills arranged on them. Collision forces therefore no longer have to be transmitted exclusively via the sills, but can be transmitted via the frame walls and, in combination with the frame walls, via the diamond-shaped struts.

The struts transfer the forces acting in the event of a frontal crash from the front frame wall into the central region of the side frame walls. From there, the forces are introduced into the rear frame wall both via the side frame walls and via the two further struts.

According to the invention, the battery box is a self-sufficient, self-supporting unit. Side members can be joined at the front and rear ends of the battery box. The battery box can in particular be integrally joined with the side members to form a load-bearing vehicle structure. The particular advantage of the battery box according to the invention is that the diamond-shaped struts enable better protection of the battery modules in various crash scenarios and that at the same time the available installation space is better used in the vertical direction of the vehicle. In addition, the stiffness properties of the battery box also improve the stiffness properties of the entire electric vehicle. This also improves the driving dynamics properties. Depending on the design, the use of the battery box in the configuration according to the invention as part of the vehicle structure can even lead to a reduction in the overall weight of the body.

The battery box has a surrounding, closed frame, which is formed by frame walls. The battery box is particularly rectangular. When viewed in the direction of travel, the two front corners of the battery case can be chamfered, for example in adaptation to a wheel case or in adaptation to the wheel lock or the installation space for wheels of the motor vehicle.

In an advantageous development, the battery case according to the invention has a strut which runs transversely to the longitudinal axis of the vehicle and extends from the central region of the left frame wall to the central region of the right frame wall. Together with the four other, diamond-shaped struts, this results in a double V-shaped strut. For optimal load transfer, all of the struts mentioned are on one level, i. H. below and / or above the ground. The strut, which runs transversely to the vehicle's longitudinal axis, is used for transverse bracing. It absorbs forces that act in a side crash. The forces are introduced into the front and rear frame wall via the double V-shaped strut, as well as directly into the opposite longitudinal frame wall via the strut running transversely to the vehicle's longitudinal axis. Since this opposite frame wall is, as it were, pushed outwards, the diagonal struts of the rhombus connected to this frame wall are subjected to tension against the front and rear frame walls of the battery box. At the same time, the other two diametrically opposed struts on the rhombus also press against the front and rear frame walls. The result is a very rigid bond due to the double V-shaped strut, which results from the essentially rectangular structure of the surrounding frame of the battery box, in combination with the cross strut and the diagonally extending struts. Since the area below the floor is usually used for an underrun protection (bollard), the reinforcement of the battery box according to the invention can also be used for this purpose. This means that the installation space in the vehicle's vertical direction is better utilized.

Construction methods based on bionic algorithms have shown that the struts facing the front of the vehicle do not have to be of constant width. The thickness of the struts can increase somewhat in the direction of the longitudinal frame walls. In addition, additional connection points to the left and right frame walls can be provided. Furthermore, additional stiffening may be expedient to increase the buckling stiffness of the diagonally extending struts, so that the V-shaped arrangement is supplemented by a further strut running transversely to the vehicle longitudinal axis. In this case, the V-shape can also be referred to as the A-shape.

Furthermore, it is advantageous if the forces introduced into the frame of the battery box by front longitudinal beams are not only introduced into the outer corner area of the battery box, but also into the central area of the front frame wall. In this case, the forces coming from the side members are introduced directly into the V-shaped struts via the center wall and from here into the side frame walls.

The crash-relevant forces are largely transmitted via the struts and the frame structure of the battery box. The bottom of the battery box has the primary function of carrying the batteries. It is joined to the frame walls, in particular, it is cohesively joined. To a certain extent, forces can also be transmitted via the floor, but it does not have the bending stiffness like a hollow profile. The floor is therefore preferably additionally braced.

There are internal struts above the floor. They can extend in the vehicle longitudinal direction and / or additionally in the vehicle transverse direction. They serve for the transverse and / or longitudinal stiffening of the interior of the battery box. In addition, they serve to limit individual battery modules to be accommodated. The inner struts therefore have several functions. With regard to the load-bearing functions, the inner struts support the V-shaped struts or the cross struts. Since the inner struts and the other struts are located on both sides of the floor, the floor as a whole is relatively narrow-meshed and strongly stiffened. The result is a truss network which, as such, is suitable for transmitting high forces with considerable rigidity.

The rigidity of the frame walls is also achieved in that they are essentially L-shaped in cross section. They have an outward horizontal leg. This means that the leg is directed away from the vehicle's longitudinal axis. The other leg is an upward vertical leg. A sill can be attached to the horizontal leg. The horizontal leg and thus the frame wall in the longitudinal direction of the vehicle are considerably strengthened via the sill, the forces acting in the event of a frontal crash being to a large extent to be transmitted via the battery box. The bending stiffness of the horizontal leg can be increased by stiffening impressions. These impressions can be arranged in groups or continuously over the entire outer circumference of the battery box or the vertical leg. They should at least be located where there are no internal struts. Areas in which no inner struts are connected to the frame wall are naturally somewhat weaker in terms of bending stiffness than those areas in which the frame walls are additionally supported on inner struts. The embossments are therefore preferably at regular intervals from two adjacent inner struts. The impressions are preferably located on the top of the horizontal leg and extend from the top over the outer edge side to the bottom of the horizontal leg. In particular, there may be several corrugated beads, which due to their function can also be referred to as anti-indentation beads.

Additional embossments can be formed on the horizontal legs in the connection area of the diagonally extending struts. If the diagonally extending struts are located below the battery box, the additional embossments are also arranged in the connection area of the diagonally running struts, preferably in the lower region of the horizontal leg.

The struts and / or the inner struts are U-shaped or hat-shaped in cross section. The struts and the inner struts are components that are joined to the floor or with a lid. The respective struts or inner struts thereby delimit cavities together with the base or cover.

These hollow structures result in rigid cross sections that can absorb high bending moments. This also reinforces the battery box. An additional load path is created through the battery box, the higher the loads that can be transmitted, the more intensive the bracing of the battery box with struts or inner struts is.

It is considered particularly effective if the cavities in the struts and / or the inner struts are part of a cooling system. Cooling systems are partly required for electric vehicles or hybrid vehicles because the batteries would age prematurely if certain operating temperatures are exceeded. The cavities can be designed for the passage of a coolant. The coolant can be a liquid or gaseous coolant or also air. Suitable cooling elements can be arranged in the cavities. The cavities themselves can be the wall of a coolant channel. It is also possible to accommodate lines in the cavities through which a coolant is passed. In this way, the inner struts and possibly also the struts help to minimize the space requirement of a cooling system. This allows larger or more battery modules to be accommodated. This leads to an increased range of the motor vehicle.

In a first embodiment, the outer walls and the bottom form a trough. The tub should be tight. For this, it is joined with a lid. The lid can be a flat, slightly profiled plate.

In a second embodiment, the outer walls enclose a separate tub, in particular in the form of a folding tub or a deep-drawing tub. In particular, it is held on the upper sides of the vertical leg. On the underside, the tub is supported by the diagonal struts. This tub is in turn sealed with a lid. The outer walls must be in this The case should not be joined tightly with the tub or with each other.

The frame walls, the struts and the inner struts are thermoformed and press-hardened with a tensile strength of at least in sections between 1300 and 2100 MPa. Alternatively, they can be cold-formed from ultra-high-strength steel and / or roll-formed with a tensile strength of at least in sections between 1300 and 1500 MPa. These steels meet the requirements of modern vehicles with regard to improved crash behavior and low vehicle weight. As an alternative to steel alloys, high-strength or high-strength aluminum alloys can also be used as frame walls, struts or inner struts, especially from the group of 6000 or 7000 (EN573-3: 2013-12) alloys. For the outer walls in particular, several chambers can thus be formed to optimize rigidity and energy absorption.

• 1 einen Batteriekasten in einer Ansicht von unten;
• 2 den Batteriekasten der 1 in einer Draufsicht von schräg oben ohne Deckel;
• 3 eine Längsschnittansicht durch den Batteriekasten der 1;
• 4 in vergrößerter perspektivischer Darstellung eine Längsschnittansicht eines Rahmenbereiches des Batterieträgers;
• 5 den Batteriekasten der 1 in einer Draufsicht ohne Deckel in Verbindung mit Längsträgern und mit geändertem Verlauf der Frontcrash-Lasteinleitung und vorderen Rahmenwand;
• 6 eine Seitenansicht des Batteriekastens gemäß 5 ohne Fahrzeugschweller;
• 7 eine Seitenansicht des Batteriekastens der 5 mit Fahrzeugschweller;
• 8 eine Ansicht von unten auf eine weitere Ausführungsform eines Batteriekastens mit bionischer V-Verstrebung und
• 9 eine Doppel-V-Verstrebung mit integrierter Querverstrebung als bionisch geformtes Pressteil zur Verbindung mit einem Batteriekasten.

The invention is explained in more detail below on the basis of exemplary embodiments illustrated in schematic drawings. It shows:

• 1 a battery box in a view from below;
• 2 the battery box of the 1 in a top view obliquely from above without a lid;
• 3 a longitudinal sectional view through the battery box of the 1 ;
• 4 an enlarged perspective view of a longitudinal sectional view of a frame region of the battery holder;
• 5 the battery box of the 1 in a plan view without a lid in connection with side members and with a modified course of the front crash load introduction and front frame wall;
• 6 a side view of the battery box according to 5 without vehicle sills;
• 7 a side view of the battery box of the 5 with vehicle sill;
• 8th a bottom view of another embodiment of a battery case with bionic V-strut and
• 9 a double V strut with integrated cross strut as a bionically shaped press part for connection to a battery box.

The 1 shows a battery box 1 for arrangement below a passenger compartment, not shown. 1 shows the battery box 1 from underneath. The battery box is used in electric vehicles or hybrid vehicles to store energy, in particular in the form of batteries or accumulators, within the battery box 1 take.

These are traction batteries for propelling the electric vehicle or hybrid vehicle. The battery box 1 owns on its illustrated bottom 2 pursuit 3 - 6 that are diagonal to the vehicle's longitudinal axis LA run as well as transverse to a vehicle transverse axis QA which are at a 90 ° angle to the vehicle's longitudinal axis LA stands. The direction of travel FR of the electric vehicle, not shown, points in the image plane in the direction of the arrow. The direction of travel FR can also be recognized by the bevelled corners 7 . 8th of the battery box 1 to make space for a wheel lock here.

The struts are used in the battery box according to the invention 3 - 6 to form a new load path, on the underside 2 of the battery box 1 , In the event of a frontal crash, a force acts in the direction of the arrow F on the frame 9 of the battery box 1 , The frame 9 is made up of several frame walls 10-13 educated. The battery box 1 is rectangular in its basic form with the said beveled corners 7 . 8th , From a front frame wall 10 becomes the force F a frontal impact both over the corners 7 . 8th in the left and right frame wall 12 . 13 initiated and from there into the rear frame wall 11 , In addition, the force F additionally centrally via the diagonal struts 3 . 4 forwarded from a central area 14 the front frame wall 10 , Here are the two struts 3 . 4 on. They include a transverse to the vehicle's longitudinal axis LA trending strut 15 to central areas 16 . 17 the left and right side walls 12 . 13 , The arrows P1 . P2 illustrate the course of force.

The cross strut 5 serves forces in the direction of the vehicle's transverse axis QA attack and by the arrow F1 are marked by a frame wall 12 to the other frame wall 13 transferred to. The arrows P3 and P4 illustrate this load case. In the figurative sense, the opposite directions of action for a side impact result from the other long side of the motor vehicle or in the case of a rear impact.

The double V-shaped bracing, in combination with the essentially rectangular frame 9 a framework-like combination of high rigidity. It can be seen that the framework 9 stiffening impressions distributed over its circumference at essentially even intervals 18 having. In this embodiment, there are left and right frame walls 12 . 13 four groups each of these impressions 18 , the imprint 18 in the middle areas 16 . 17 not all over the bottom 2 of the battery box 1 extends. There are additional embossments 19 in the connection area of the transverse strut 15 positioned. This can cause transverse forces in the direction of the arrow F1 better in the transverse strut 15 be transmitted. The impressions 18 are in this view on the longitudinal frame walls 12 . 13 directly opposite each other. They are also located where in the area of the floor 20 reinforcing beads 21 are arranged. The reinforcing beads 21 each run in the transverse direction, that is to say they run parallel to the substantially larger transverse strut 15 between the two central areas 16 . 17 of the longitudinal frame walls 12 . 13 , The term midrange 16 . 17 in this context does not mean that this is necessarily the exact center of the side frame wall 12 . 13 must act. In this embodiment, the front V in the direction of travel is that of the two struts 3 . 4 is formed slightly shorter than the rear V, which is formed by the struts 5 . 6 is formed, ie the central areas 15 . 16 are slightly shifted forward in the direction of travel, but they are at a distance from the front and rear frame walls 10 . 11 or at a distance from the central areas there 14 . 22 , The location of the central area 14 along the length of the frame wall 12 . 13 and 22 can be adapted in particular to vehicle crash test conditions such as to the impact position of a pile in the pile impact test.

According to the representation 2 is the battery box 1 seen from diagonally above. It can be seen that is inside the battery box 1 further inner struts 23 . 24 are located, which extend in the longitudinal direction or transverse direction. The transverse struts 24 are equidistant from the neighboring reinforcing beads 21 in the ground 20 arranged. This means that the transverse inner struts 24 the frame 9 of the battery box 1 stiffen where there are no impressions 18 are located. Due to the alternating offset of the impressions 18 in combination with the reinforcement beads on the bottom 21 , the transverse inner struts 24 and the indicated diagonal struts 3 - 6 as well as the cross strut 15 the result is a very rigid bond that can absorb high lateral forces.

From the representation of the 2 it is also clear that the frame walls 10-13 are configured essentially L-shaped. They each have an outward horizontal leg 25 and the interior of the battery box 1 limiting vertical leg 26 ,

The sectional view of the 3 shows the battery box 1 in longitudinal section. The L-shaped frame walls extend over a large part of the height of the battery box 1 , Overall, the battery box 1 very flat. On a bottom 2 the struts of the battery box run 4 . 6 . 15 and support the floor 20 , They form a new load path in combination with the floor 20 and with the frame 9 of the battery box 1 , Inside the battery box 1 are the inner struts projecting upwards, ie in the Z direction 24 to see that run in the transverse direction. These have a lower height than the longitudinal struts 23 , The reinforcing beads 21 have much smaller dimensions than the other inner struts 23 . 24 or as the struts 4 . 6 . 15 that cover the entire battery box 1 stiffen.

The perspective view of the 4 shows in longitudinal section details of the L-shaped frame walls. In this example, the cut runs through the middle area 14 the front frame wall 10 , On the one hand it is the impression 18 recognizable as an arrangement of four parallel, parallel beads. These impressions 18 extend over a top 27 of the horizontal leg 25 , sit over its outward-facing edge 28 to the bottom 30 continued as it did in 1 is shown. In addition there is an infiltration in the cross section 29 on a bottom 30 of the horizontal leg. The infiltration 29 has a height measured in the Z direction, ie in the vertical direction, which essentially corresponds to the height of the diagonally extending strut measured in the Z direction 3 at the bottom of the battery box 1 equivalent. The location of the infiltration 29 is adapted to the connection points of the strut 3 , also recognizable in 8th , It can also be seen that the battery box 1 a tub 31 has. The tub 31 can be produced using the deep-drawing process or by folding. In this embodiment, it lies on an upper side of the vertical leg 26 and is underneath by the diagonal strut 3 as well as the other striving mentioned. All struts on the underside 3-6 . 15 are particularly with the floor 20 together.

The frame 9 who have favourited Struts 3 - 6 . 15 and also the inner struts 23 . 24 are made of steel. In particular, they consist of hot-formed and press-hardened steels. The frame 9 is configured as a hollow profile. The horizontal leg 25 also has several screw holes 32 for fastening a sill, not shown.

5 shows the battery box 1 the 1 - 4 in the installation situation. The battery box is in this position 1 along the left and right frame wall 12 . 13 screwed. There are also side members 34 . 35 to recognize that is in the front end of a vehicle body extend. The side members 34 . 35 are straight in the area of the wheel bulges, not shown, and run parallel to the longitudinal axis of the motor vehicle. Because the battery box 1 is wider than the two side members 34 . 35 there is a curved transition area 36 . 37 of each side member. In this transition area 36 . 37 leads the respective side member 34 to the outside past the wheel not shown in detail. At the ends of the transition area 36 is the respective side member 34 . 35 in a manner not shown with the battery box 1 connected. In addition there are on each side member 34 diagonal struts directed towards the center of the vehicle 38 . 39 trained up to a mid-range 14 of the battery box. In a manner not shown, the diagonal struts 38 . 39 in the event of a frontal crash, forces directly into the middle area 14 and from here on the struts not shown 3 . 4 in the area of the bottom of the battery box 1 into the longitudinal frame walls 12 . 13 be transmitted.

6 shows the installation situation according to 5 in a side view without mounted sills. It can be seen that the diagonal strut 39 extends further downward than the transition region bent downwards 37 of the side member 35 , The transition area 37 is therefore not only curved outwards, but also downwards.

7 shows in comparison the installation situation with mounted sill 33 , Now it becomes clear that the cranked transition area 37 of the side member 35 on the sill 33 that supports in the area of the bottom 2 of the battery box 1 runs.

In a development of the invention is in 8th a bionic V-bracing with integrated cross bracing. A conventional V-strut is shown in the image plane on the right. This bionic V-strut can be provided as a single V-arrangement in such a battery box. A double V strut can also be provided, as shown in detail 9 is shown. It can be seen that, taking bionic computing algorithms into account, additional struts result. It is striking that in the central connection area to the side frame walls additional support struts 40 are formed, which are essentially at right angles to the diagonally extending struts 3 - 6 run. In this embodiment ( 8th and 9 ) the previously introduced reference symbols have been retained for essentially the same components.

It is also striking that the central, transverse strut 15 is comparatively large. It has a width that is greater than the width of the other struts 3 - 6 , In addition, it should be noted that another strut 41 parallel to the central, transverse strut 15 is formed in the embodiment of 9 running in the transverse direction and at a distance from the central transverse strut 15 , As a result, the double V strut is a double A strut with a central cross strut 15 , It can also be seen that a node area 42 , which is for connection to a left and right frame wall 12 . 13 serves, is relatively large. A central transmission range for the forces is provided here both in a frontal crash and in a side crash.

LIST OF REFERENCE NUMBERS

1 -

battery box

2 -

bottom

3 -

strut

4 -

strut

5 -

strut

6 -

strut

7 -

corner

8th -

corner

9 -

frame

10 -

Front frame wall

11 -

Rear frame wall

12 -

Left frame wall

13 -

Right frame wall

14 -

Middle range of 10

15 -

Cross strut

16 -

Middle range of 12

17 -

Middle range of 13

18 -

impressing

19 -

Versickung

20 -

ground

21 -

Reinforcing bead in 20

22 -

Middle range of 11

23 -

internal brace

24 -

internal brace

25 -

horizontal leg

26 -

vertical leg

27 -

Top of 25

28 -

Edge of 25

29 -

Infiltration of 14

30 -

screw

31 -

tub

32 -

screw

33 -

sill

34 -

longitudinal beams

35 -

longitudinal beams

36 -

Transition area of 34

37 -

Transition area of 35

38 -

diagonal strut

39 -

diagonal strut

40 -

support strut

41 -

crossmember

42 -

node region

KF -

Force in frontal crash

F1 -

Force in side crash

FR -

direction of travel

LA -

vehicle longitudinal axis

B1 -

direction of force

P2 -

direction of force

P3 -

direction of force

P4 -

direction of force

QA -

Vehicle transverse axis

Claims (10)

Battery box (1) for arrangement below a passenger compartment of an electric vehicle or hybrid vehicle, the battery box (1) having struts (3 - 6) which run diagonally to the vehicle longitudinal axis (LA) and to the vehicle transverse axis in order to stiffen the lower region of the passenger cell, in each case two struts (3, 4; 5, 6) run from a front and a rear frame wall (11) of the battery box (1) to a left and right frame wall (12, 13), characterized in that the struts (3, 4; 5, 6) from the central areas (14, 22) of the front and rear frame wall (10, 11) of the battery box (1) to the central areas (16, 17) of a left and right frame wall (12, 13), so that the Struts (3 - 6) are arranged in the form of a rhombus, the struts (3 - 6) being arranged on an underside (2) and / or an upper side of the battery box (1), with internal struts (23 , 24) are arranged, which are in driving extend longitudinal and / or transverse direction (LA, QA), for limiting individual battery modules to be accommodated and for longitudinally and / or transversely stiffening an interior of the battery box (1), the frame walls (10 - 13) being L-shaped in cross section an outwardly directed horizontal leg (25) and an upwardly directed vertical leg (26), the horizontal leg (25) having stiffening impressions (18) which are arranged at least where no inner struts (23, 24) are arranged and wherein the Frame walls (10-13), the struts (3-6) and the inner struts (23, 24) are hot-formed and press-hardened or cold-formed from UHSS and / or roll-formed from UHSS. Battery box after Claim 1 , characterized in that the battery box (1) is joined at its front end and / or at its rear end with side members. Battery box after Claim 1 or 2 , characterized in that a strut (15) extending transversely to the vehicle longitudinal axis (LA) runs from the central region (16) of the left frame wall (12) to the central region (17) of the right frame wall (13). Battery box according to one of the Claims 1 to 3 , characterized in that struts (3 - 6) extending on the top side of the battery box (1) are integrated in a cover which is fastened to the frame walls (10-13). Battery box according to one of the Claims 1 to 4 , characterized in that all the struts (3 - 6, 15) on the underside run in a plane below the base (20). Battery box according to one of the Claims 1 to 5 , characterized in that the bottom (20) of the battery box (1) is joined to the frame walls (10 - 13). Battery box after Claim 6 , characterized in that the bottom (20) is tightly joined to the frame walls (10 - 13). Battery box according to one of the Claims 1 to 7 , characterized in that in a connection point of a strut (3 - 6) on one of the frame walls (10 - 13) at least one infiltration (29) is formed in the frame wall (10 - 13). Battery box according to one of the Claims 1 to 8th , characterized in that in the struts (3 - 6, 15) and / or the inner struts (23, 24) there are cavities which are components of a cooling system, the cavities through which a coolant can flow. Battery box according to one of the Claims 1 to 9 , characterized in that a lid of the Battery box (1) is tightly joined to the frame walls (10 - 13).

Images