KR20220126134A - Battery case for vehicle - Google Patents

Abstract

The present invention includes: a lower panel that supports the lower side of a plurality of battery modules and has a side wall bent upward; a side member formed to surround and support the side wall of the lower panel and to protect side surfaces of the battery modules; and a plurality of reinforcing members coupled so that both ends thereof can be supported on the side wall across between the mounted battery modules.

Description

Vehicle battery case {BATTERY CASE FOR VEHICLE}

The present invention relates to a structure for mounting a battery in a hybrid vehicle or an electric vehicle.

The market demand for eco-friendly vehicles such as hybrid vehicles and electric vehicles is increasing, and in order to meet various demands for such eco-friendly vehicles, it is essential to increase the energy capacity of batteries installed in vehicles.

Therefore, there is a need for a technology capable of ensuring sufficient durability and safety while mounting a battery to a level capable of providing as large an energy capacity as possible in a limited space of a vehicle.

The matters described as the background technology of the present invention are only for improving the understanding of the background of the present invention, and should not be taken as acknowledging that they correspond to prior art already known to those of ordinary skill in the art. will be

KR 1020140045778 A

The present invention secures a space for mounting a battery in a vehicle as large as possible to provide the energy capacity required for an eco-friendly vehicle, and secures sufficient safety and durability from a vehicle crash accident, etc. It is an object of the present invention to provide a vehicle battery case that can improve the

The battery case of the present invention vehicle for achieving the above object,

a lower panel supporting the lower side of the plurality of battery modules and having a sidewall bent upward;

a side member formed to connect and support the side wall and the outer surface of the lower panel to protect the side surfaces of the battery modules;

A plurality of reinforcing materials coupled to cross between the mounted battery modules so that both ends are supported by the sidewall;

It is characterized in that it comprises a.

The sidewall of the lower panel may have an angle α bent upward from the bottom surface of the lower panel within a range of 90°<α<92°.

The side member may be integrally formed with a protruding end protruding to the outside in at least a portion of the section.

The side member

a vertical closed cross-section forming a vertical wall coupled to a sidewall of the lower panel;

a horizontal closed cross-section forming the protruding end below the vertical closed cross-section;

an intermediate closed section connecting the vertical closed section and the horizontal closed section;

It may be composed of

The side member

a first panel bent to form one closed curve forming the vertical closed cross-section and the horizontal closed cross-section;

a second panel having both ends coupled to the first panel to form the intermediate closed cross-section;

can be made with

The side member may be configured to include a lower reinforcement panel that extends from the protruding end toward the lower side of the lower panel and is coupled to the lower side of the lower panel.

The lower reinforcing panel may be coupled with the protruding end of the side member and the lower panel to form a lower closed cross-section below the protruding end.

As the lower reinforcement panel extends to the lower panel,

a horizontal portion extending in a direction parallel to the lower panel;

an inclined portion inclined with respect to the lower panel;

It may be composed of

The lower reinforcement panel is

a gap forming part provided to extend downwardly from the end of the protruding end;

a first horizontal portion extending from the gap forming portion in a direction parallel to the lower panel;

an inclined portion inclined downward from the first horizontal portion;

a second horizontal portion extending from the inclined portion in a direction parallel to the lower panel and coupled to the lower panel;

It may be composed of

The inclined portion may be formed such that an angle β between the first horizontal portion and the second horizontal portion, respectively, is in the range of 1° < β < 3°.

The reinforcement is

a base member having a base closed cross-section by itself;

an additional member coupled to the base member by two overlapping surfaces and forming another additional closed cross-section together with the base member;

can be composed of

the base member includes two vertical surfaces defining the base closed cross-section;

the overlapping surfaces of the additional member are respectively overlapped and coupled to the two vertical surfaces of the base member;

The lower surface of the base member has a toe portion protruding laterally from the two vertical surfaces corresponding to the thickness of the overlapping surface of the additional member;

It may be composed of

The present invention secures a space for mounting a battery in a vehicle as large as possible to provide the energy capacity required for an eco-friendly vehicle, and secures sufficient safety and durability from a vehicle crash accident, etc. to be able to improve

1 is an exploded perspective view showing a battery case of a vehicle according to the present invention;
2 is a cross-sectional view taken along line II-II of FIG. 1;
3 to 5 are graphs showing strength test results according to the bending angle of the sidewall of the lower panel, respectively;
6 is a cross-sectional view taken along the line VI-VI of FIG. 1;
7 is a view for explaining a state in which the lower panel is coupled in the cross-sectional view of FIG. 6;
8 is a graph showing a comparison of strength test results according to the angle between the inclination parts of the lower reinforcement panel;
9 is a cross-sectional view taken along line IX-IX of FIG. 1 .

Specific structural or functional descriptions of the embodiments of the present invention disclosed in this specification or application are only exemplified for the purpose of describing the embodiments according to the present invention, and the embodiments according to the present invention may be implemented in various forms. and should not be construed as being limited to the embodiments described in the present specification or application.

Since the embodiment according to the present invention can have various changes and can have various forms, specific embodiments are illustrated in the drawings and described in detail in the present specification or application. However, this is not intended to limit the embodiment according to the concept of the present invention with respect to a specific disclosed form, and should be understood to include all changes, equivalents or substitutes included in the spirit and scope of the present invention.

Terms such as first and/or second may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one element from another element, for example, without departing from the scope of the present invention, a first element may be called a second element, and similarly The second component may also be referred to as the first component.

When a component is referred to as being “connected” or “connected” to another component, it may be directly connected or connected to the other component, but it is understood that other components may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that the other element does not exist in the middle. Other expressions describing the relationship between elements, such as "between" and "immediately between" or "neighboring to" and "directly adjacent to", etc., should be interpreted similarly.

The terms used herein are used only to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present specification, terms such as “comprise” or “have” are intended to designate that the described feature, number, step, operation, component, part, or combination thereof exists, and includes one or more other features or numbers. , it should be understood that it does not preclude the existence or addition of steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as meanings consistent with the context of the related art, and unless explicitly defined in the present specification, they are not to be interpreted in an ideal or excessively formal meaning. .

Hereinafter, the present invention will be described in detail by describing preferred embodiments of the present invention with reference to the accompanying drawings. Like reference numerals in each figure indicate like elements.

1 to 9 , the battery case of the vehicle of the present invention includes a lower panel 5 supporting the lower side of a plurality of battery modules 1 and having a sidewall 3 bent upward; a side member (7) formed to surround and support the side wall (3) of the lower panel (5) to protect the side surfaces of the battery modules (1); It crosses between the mounted battery modules (1) and is configured to include a plurality of reinforcing materials (9) coupled so that both ends are supported on the sidewall (3).

That is, in the battery case of the present invention, the lower side of the plurality of battery modules 1 to be mounted on the vehicle is supported by the lower panel 5, the side surface is supported by the side member 7, and the battery module 1 ), the plurality of reinforcing materials 9 are installed between the two to ensure sufficient strength while sufficiently securing a mounting space for the battery modules 1 .

For reference, after a separate cover (not shown) is coupled to the upper side of the battery case, it may be mounted on the vehicle.

The lower panel 5 forms the sidewall 3 by bending the outer portion upward as shown, and the sidewall 3 is formed upward from the bottom surface 11 of the lower panel 5 . It is preferable that the bent angle α is set within the range of 90°<α<92°.

This can be made clear from the comparison of the strength test results of the lower panel 5 shown in FIGS. 3 to 5 .

3 to 5 show the results of testing in a manner that a force is applied from the side while the front and rear ends of the lower panel 5 are fixedly supported, respectively, and as time elapses from the time when the force is applied, the lower panel ( It can be seen that the magnitude of the reaction force supported by 5) has two peak values of the first and second orders.

Among the first and second peak values, the first peak value that can be viewed in a state in which substantial deformation of the lower panel 5 does not occur is important, and when comparing these first peak values, the first peak value of FIG. It shows 186.95 kN, the primary peak value of FIG. 4 shows 131.36 kN, and the primary peak value of FIG. 5 shows 161.57 kN, so it can be seen that the case of FIG. 3 is the most preferable.

In the case of FIG. 3, since α=91°, in FIG. 4 α=90°, and in FIG. 5 α=92°, the sidewall 3 is the bottom of the lower panel 5 as described above. The angle α bent upward from the surface 11 is preferably set within the range of 90°<α<92°.

For reference, the lower panel 5 may be formed of an aluminum plate having a thickness of 2 mm.

On the other hand, the side member 7 has a configuration in which the protruding end 13 protruding to the outside is integrally formed in at least some sections.

Among the side members 7 in this embodiment, the portion where the protruding end 13 is formed is a portion in both lateral directions shown in FIG. 1 , and when the battery case is substantially mounted on the vehicle body, the protruding end 13 ) formed portion is mounted to face the lateral direction of the vehicle body, so that, in the event of an accident such as a lateral collision of the vehicle, it is possible to effectively prevent an external shock from being transmitted to the battery module 1 inside the battery case.

6 and 7 , a cross-section of a portion of the side member 7 where the protruding end 13 is formed forms a vertical wall coupled to the side wall 3 of the lower panel 5 . between the closed vertical cross-section 15 and the horizontal closed cross-section 17 forming the protruding end 13 from the lower side of the vertical closed cross-section 15, and the vertical closed cross-section 15 and the horizontal closed cross-section 17 It is configured to include an intermediate closed cross-section (19) connecting the.

That is, to protect the sides of the mounted battery modules 1 while forming a sufficient coupling surface with the lower panel 5 by the vertical closed cross-section 15, and to be formed by the horizontal closed cross-section 17 By securing greater rigidity with the protruding end 13, the protection ability of the battery modules 1 is maximized, and the vertical closed cross-section 15 and the horizontal closed cross-section 17 are separated by the intermediate closed end surface 19. By composing a solid multi-closed cross-sectional structure together, it is sufficient to secure the rigidity of the battery case itself.

In this embodiment, the side member 7 includes a first panel 18 bent to form a single closed curve forming the vertical closed section 15 and the horizontal closed section 17; and a second panel 20 having both ends coupled to the first panel to form the intermediate closed cross-section.

That is, the first panel 18 is bent as shown in the cross section of FIG. 6 , and the second panel 20 is joined by welding or the like to constitute the side member 7 . is a structure in which the number of parts used is small, manufacturing is easy, and forming a large number of closed cross-sections advantageous for rigidity.

For reference, the vertical closed section 15 and the sidewall 3 of the lower panel 5 may be configured to be coupled by a plurality of welding points as shown in FIG. 7 .

In addition, in this embodiment, the side member 7 extends from the protruding end 13 toward the lower side of the lower panel 5, and is coupled to the lower side of the lower panel 5, the lower reinforcement panel ( 21) is included.

The lower reinforcing panel 21 is coupled with the protruding end 13 of the side member 7 and the lower panel 5 to form a lower closed end face 31 below the protruding end 13 .

That is, the lower reinforcing panel 21 forms a more complex multi-closed cross-sectional structure together with the lower panel 5 in addition to the multi-closed cross-sectional structure of the side member 7 itself. This is to more effectively protect the mounted battery module 1 against an impact.

The lower reinforcement panel 21 extends to the lower panel 5, and includes a horizontal portion extending in a direction parallel to the lower panel 5; It may be configured to include an inclined portion inclined with respect to the lower panel (5).

In this embodiment, the lower reinforcing panel 21 includes a gap forming part 23 provided to extend downwardly from the end of the protruding end 13; a first horizontal portion (25) extending from the gap forming portion (23) in a direction parallel to the lower panel (5); an inclined portion 27 inclined downward from the first horizontal portion 25; and a second horizontal portion 29 extending from the inclined portion 27 in a direction parallel to the lower panel 5 and coupled to the lower panel 5 .

That is, the lower reinforcement panel 21 has a configuration in which the first horizontal portion 25 and the second horizontal portion 29 spaced apart from the lower side of the protruding end 13 include the inclined portion 27 therebetween. The lower closed end face 31 is formed between the protruding end 13 and the lower panel 5 .

It is preferable that the inclined portion 27 has an angle β formed with the first horizontal portion 25 and the second horizontal portion 29 in the range of 1° < β < 3°.

FIG. 8 is a test result in which a force is applied from the side in a state in which both ends of the side member 7 having the cross-sectional structure as shown in FIG. 6 are fixedly supported. When β=0°, β=2°. In the case of , the case of β = 3° is compared together, and when β = 2°, the maximum force of 36.3 kN can be endured, so the inclined portion 27 is the first horizontal portion 25 and the second The angle β between the two horizontal portions 29 and each of them is preferably formed in the range of 1° < β < 3°.

For reference, the cross-sectional structure shown in FIG. 6 may be formed by roll forming of an aluminum plate having a thickness of 2.5 mm.

On the other hand, the reinforcing material 9, as shown in Fig. 9, the base member 35 having its own closed base end face 33; It is preferable to include an additional member 41 that is coupled to the base member 35 by two overlapping surfaces 37 and forms another additional closed cross-section 39 together with the base member 35 .

Since the base member 35 has the base closed end face 33 by itself, it is preferably made of aluminum extruded material, etc., and the additional member 41 is formed by aluminum roll forming and coupled to each other by welding. It is preferable to do

the base member (35) comprises two vertical surfaces (43) forming the base closed section (33); the overlapping surface 37 of the additional member 41 overlaps and is coupled to the two vertical surfaces 43 of the base member 35, respectively; The lower surface of the base member 35 is configured to include a toe portion 45 protruding laterally from the two vertical surfaces 43 to correspond to the thickness of the overlapping surface 37 of the additional member 41 .

That is, the overlapping surface 37 and the vertical surface 43 are coupled by welding or the like to form a solid coupling state between the base member 35 and the additional member 41, and the tow portion 45 is the reinforcing material. The weight increase of (9) serves to greatly increase the section modulus while minimizing the weight increase, and ultimately, it is possible to secure excellent rigidity of the battery case by the reinforcing material (9).

Although the present invention has been shown and described with respect to specific embodiments, it is within the art that the present invention can be variously improved and changed without departing from the spirit of the present invention provided by the following claims. It will be obvious to those of ordinary skill in the art.

One; battery module
3; side wall
5; lower panel
7; side member
9; reinforcement
11; bottom surface
13; protrusion
15; vertical closed section
17; Horizontal closed section
19; middle closed section
21; lower reinforcement panel
31; lower closed section
23; gap forming part
25; 1st horizontal part
27; slope
29; 2nd horizontal part
33; Base closed section
35; base member
37; overlapping face
39; additional closed section
41; additional member
43; vertical plane
45; Tobu

Claims (12)

a lower panel supporting the lower side of the plurality of battery modules and having a sidewall bent upward;
a side member formed to connect and support the side wall and the outer surface of the lower panel to protect the side surfaces of the battery modules;
A plurality of reinforcing materials coupled to cross between the mounted battery modules so that both ends are supported by the sidewall;
A vehicle battery case comprising a. The method according to claim 1,
The sidewall of the lower panel, the angle α bent upward from the bottom surface of the lower panel is within the range of 90 ° < α < 92 °
A vehicle battery case, characterized in that. The method according to claim 1,
The side member is integrally formed with a protruding end protruding to the outside in at least some sections
A vehicle battery case, characterized in that. 4. The method according to claim 3,
The side member
a vertical closed cross-section forming a vertical wall coupled to a sidewall of the lower panel;
a horizontal closed cross-section forming the protruding end below the vertical closed cross-section;
an intermediate closed section connecting the vertical closed section and the horizontal closed section;
consisting of
A vehicle battery case, characterized in that. 5. The method according to claim 4,
The side member
a first panel bent to form one closed curve forming the vertical closed cross-section and the horizontal closed cross-section;
a second panel having both ends coupled to the first panel to form the intermediate closed cross-section;
A vehicle battery case, characterized in that consisting of. 4. The method according to claim 3,
The side member is configured to include a lower reinforcement panel that extends from the protruding end toward the lower side of the lower panel and is coupled to the lower side of the lower panel.
A vehicle battery case, characterized in that. 7. The method of claim 6,
The lower reinforcing panel is coupled with the protruding end of the side member and the lower panel to form a lower closed cross-section below the protruding end
A vehicle battery case, characterized in that. 7. The method of claim 6,
As the lower reinforcement panel extends to the lower panel,
a horizontal portion extending in a direction parallel to the lower panel;
an inclined portion inclined with respect to the lower panel;
A vehicle battery case comprising a. 7. The method of claim 6,
The lower reinforcement panel is
a gap forming part provided to extend downwardly from the end of the protruding end;
a first horizontal portion extending from the gap forming portion in a direction parallel to the lower panel;
an inclined portion inclined downward from the first horizontal portion;
a second horizontal portion extending from the inclined portion in a direction parallel to the lower panel and coupled to the lower panel;
A vehicle battery case comprising a. 10. The method of claim 9,
The inclined portion is formed in a range of 1° < β < 3° between the first horizontal portion and the second horizontal portion and an angle β formed respectively
A vehicle battery case, characterized in that. The method according to claim 1,
The reinforcement is
a base member having a base closed cross-section by itself;
an additional member coupled to the base member by two overlapping surfaces and forming another additional closed cross-section together with the base member;
A vehicle battery case, characterized in that consisting of. 12. The method of claim 11,
the base member includes two vertical surfaces defining the base closed cross-section;
the overlapping surfaces of the additional member are respectively overlapped and coupled to the two vertical surfaces of the base member;
The lower surface of the base member has a toe portion protruding laterally from the two vertical surfaces corresponding to the thickness of the overlapping surface of the additional member;
A vehicle battery case comprising a.

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