KR20220135608A - Battery case for plug in hybrid vehicle - Google Patents

Abstract

The present invention provides a lightweight battery case for electric and hybrid vehicles. The disclosed lightweight battery case for electric and hybrid vehicles includes: a lower case in which a lower assembling plate is formed to be bent along an upper-end edge portion and a battery module and a control module are mounted, and which is formed of a metal material; and an upper case in which an upper assembling plate is formed to be bent along an edge and a friction-reducing part for reducing frictional force during press molding is provided, wherein the upper assembling plate is press-formed by an aluminum material so as to cover the lower case and is assembled to the lower assembling plate. Therefore, the present invention can prevent an adhesion phenomenon, in which the upper case is adhered to molds during press molding by forming the upper case, press-molded from an aluminum material, to be divided, and can reduce weight.

Description

Lightweight battery case for electric and hybrid vehicles {BATTERY CASE FOR PLUG IN HYBRID VEHICLE}

The present invention relates to a lightweight battery case for electric and hybrid vehicles, and more particularly, the upper case, which is pressed and molded by an aluminum material, is dividedly formed, so that it is possible to prevent the seizure phenomenon from sticking to the mold during pressing molding, and the weight (lightening) ) to a lightweight battery case for electric and hybrid vehicles.

Recently, interest in environmental vehicles has increased due to environmental problems, high oil prices, and the like, and electric vehicles and hybrid vehicles that use electric energy to drive the vehicle are being developed in various ways.

Accordingly, in recent years, the development and distribution of electric vehicles (EVs) and fuel cell vehicles (FCEVs), which exclude the use of fossil fuels, and hybrid vehicles (HEVs) that combine the characteristics of internal combustion engines and electric vehicles have rapidly spread and increased. there is a trend

In the case of such an electric vehicle, since electric driving using only batteries accounts for a large proportion, high efficiency must be ensured even in electric driving.

Accordingly, as a battery module used in electric vehicles and hybrid vehicles, a pouch-type battery cell unit accommodating one battery cell in a pouch is widely used. Here, a plurality of battery cell units are stacked and accommodated in one battery pack case, and the number of battery cell units is determined according to a required power level.

In particular, in recent years, in order to reduce the weight of the battery module, a battery case for protecting the battery pack has been manufactured using various lightweight materials, and in general, aluminum material is mainly used. And in order to increase productivity, most battery cases are generally press-processed using molds.

However, in the case of the battery case of the prior art as described above, when aluminum (Al) material is used for weight reduction, the aluminum material sticks to the mold during the forging process using a mold due to the nature of the press molding of the aluminum material. There is a problem that productivity is lowered as well as the defect rate increases during the molding process.

Therefore, there is a need to improve it.

On the other hand, domestic Patent Registration No. 10-1279416 (registration date: 2013.06.21) discloses "a battery case for a plug-in hybrid vehicle", and in Patent Publication No. 10-2018-0068379 (published on December 13, 2016), "electricity A battery case of an automobile" is disclosed.

The present invention was created by the above necessity, and since the upper case to be pressed molded by the aluminum material is divided and formed, it is possible to prevent the seizure phenomenon in which the aluminum material, which is the material of the upper case, sticks to the mold during pressing molding. In addition, an object of the present invention is to provide a lightweight battery case for electric and hybrid vehicles capable of reducing weight by reducing weight.

In order to achieve the above object, in a lightweight battery case for electric and hybrid vehicles according to an aspect of the present invention, a lower assembly plate is bent along an upper edge portion, a battery module and a control module are mounted therein, and is formed of a metal material. and a lower case, which is formed by bending an upper assembly plate assembled to the lower assembly plate along the edge, and an upper case press-molded by an aluminum material to cover the lower case.

In addition, in the present invention, the upper case is characterized in that it is provided with a friction reducing unit for reducing the friction force during press molding.

In the present invention, the lightweight battery case for electric and hybrid vehicles further includes a case sealing part positioned between the lower assembly plate and the upper assembly plate to seal the lower case and the upper case.

In addition, in the present invention, the upper case is divided and formed based on the central portion in order to reduce frictional force with the press during press molding, and is press-molded.

In addition, in the present invention, the upper case includes a first case molded cover part coupled to the lower case, a second case molded cover part coupled to the first case molded cover part to form the upper case, and the second case In order to join the one-case molded cover part and the second case molded cover part, the case-forming joint part is formed to extend from one of the first case molded cover part and the second case molded cover part, and the other end is overlapped and welded. It is characterized in that it includes.

In addition, in the present invention, the case forming joint part includes a joint rib bent downward from the end of the first case molded cover part, and the joint rib to support the end part of the second case molded cover part seated on the joint rib. It is characterized in that it comprises a bonding support reinforcement plate formed to extend.

As described above, in the lightweight battery case for electric and hybrid vehicles according to an aspect of the present invention, unlike the prior art, by forming a friction reducing part for reducing friction with the mold in the upper case press-molded by an aluminum material, the aluminum material is It has the effect of reducing the seizure phenomenon that sticks to the mold.

In addition, since the lightweight battery case for electric and hybrid vehicles according to the present invention is formed as the upper case is divided and joined to each other after press molding is completed, the aluminum material, which is a material, is prevented from sticking to the mold, thereby improving productivity. It can improve, and has the effect which can reduce the defect rate.

In addition, the lightweight battery case for electric and hybrid vehicles according to the present invention has an effect of reducing the weight since the upper case is formed of an aluminum material.

1 is a perspective view illustrating a lightweight battery case for electric and hybrid vehicles according to an embodiment of the present invention.
2 is an exploded perspective view illustrating an upper case according to an embodiment of the present invention.
3 is a cross-sectional view for explaining an upper case according to an embodiment of the present invention.
4 is a perspective view illustrating a case sealing unit according to an embodiment of the present invention.
5 is an enlarged cross-sectional view illustrating a case sealing part according to an embodiment of the present invention.

Hereinafter, preferred embodiments of a lightweight battery case for electric and hybrid vehicles according to the present invention will be described with reference to the accompanying drawings. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to intentions or customs of users and operators. Therefore, definitions of these terms should be made based on the content throughout this specification.

1 is a perspective view for explaining a lightweight battery case for electric and hybrid vehicles according to an embodiment of the present invention, FIG. 2 is an exploded perspective view for explaining an upper case according to an embodiment of the present invention, and FIG. 3 is this view It is a cross-sectional view for explaining an upper case according to an embodiment of the present invention.

In addition, FIG. 4 is a perspective view illustrating a case sealing unit according to an embodiment of the present invention, and FIG. 5 is an enlarged cross-sectional view illustrating a main part of the case sealing unit according to an embodiment of the present invention.

1 to 5 , the lightweight battery case 100 for electric and hybrid vehicles according to an embodiment of the present invention is installed in the body of an electric vehicle and a hybrid vehicle to operate a motor for driving the vehicle. electricity is charged

In addition, the lightweight battery case 100 for electric and hybrid vehicles according to this embodiment can be lightweight while improving durability, and is manufactured by press-molding various materials and then bonding them together. It can prevent the material from sticking to the mold.

To this end, the lightweight battery case 100 for electric and hybrid vehicles according to the present embodiment includes a lower case 110 press-formed by a metal material, an upper case 120 press-formed by an aluminum material, and a lower part assembled with each other. and a case sealing unit 130 for sealing the case 110 and the upper case 120 .

In the lightweight battery case 100 for electric and hybrid vehicles according to this embodiment, the lower case 110, which requires rigidity, is formed of a metal material, and the upper case 120 for sealing is formed through an aluminum material, The assembly durability of the vehicle body is improved and the weight can be reduced.

The lower case 110 is press-formed by a high-tensile steel plate of 440 MPa class or SPRC440, and a battery module, a control module, and the like are mounted therein. The lower case 110 is fixed to the vehicle body by bolts and nuts, and the open upper side is covered and sealed by the upper case 120 .

In addition, the lower case 110 has a rigid reinforcing plate attached therein so as to reinforce the rigidity and fix the battery module, various types of fixing brackets for mounting the control module are joined, and wiring of the wire harness on the side and lower surfaces. A wiring hole is formed for

In particular, in the lower case 110 , the lower assembly plate 111 is bent outwardly along the upper edge of the lower case 110 to be coupled to the upper case 120 through a bolt and a nut, and a case sealing part is provided on the lower assembly plate 111 . After the 130 is seated, the upper case 120 is assembled.

The lower case 110 according to the present embodiment may be formed while processing a high-tensile steel sheet of 440 MPa class or SPRC440 through pressing at least three times or more.

The lower assembly plate 111 has an end bent in a round shape to prevent damage and deformation due to collision to form a reinforcing round portion, and a lower assembly hole 113 for bolt assembly is formed.

This lower case 110 is made of a high-strength steel plate of 440 MPa class or SPRC440 to stably and firmly fix the vehicle body of the lightweight battery case 100 for electric and hybrid vehicles, and to have impact resistance due to impact.

The upper case 120 according to this embodiment is coupled to the lower assembly plate 111 of the lower case 110 through bolts and nuts to cover and seal the lower case 110, and a lightweight battery case for electric and hybrid vehicles ( In order to reduce the overall weight of 100), it is press-molded by an aluminum material, which is a material different from that of the lower case 110 .

This, the upper case 120 is formed by dividing the amount of dripping into two or more so as to reduce frictional force with the mold when press-molded by an aluminum material, and then joined to each other through welding, and has a friction reducing part 120a do.

In addition, in the upper case 120 , the upper assembly plate 121 seated and fixed on the lower assembly plate 111 is bent at the edge portion, and an upper assembly hole portion for insertion of a bolt into the upper assembly plate 121 ( 121a) is formed. The upper assembly plate 111 is seated on the lower assembly plate 111 , and a case sealing part 130 is provided between the upper assembly plate 121 and the lower assembly plate 111 . A portion of the upper assembly plate 111 is cut or opened to form the friction reducing portion 120a.

In particular, the upper case 120 is coated with the outer ear due to the nature of the aluminum material, which is difficult to press-molding, and undergoes various heat treatment processes, which causes a seizure phenomenon that sticks to the mold during press molding.

In order to prevent such a seizure phenomenon, the upper case 120 includes a first case molded cover part 123 and a second case molded cover part 125 that are dividedly formed, and the first case molded cover part 123 . and the second case-formed cover part 125 are bonded to each other by the case-formed joint part 127 .

In addition, in the upper case 120 , the first case-molded cover part 123 and the second case-molded cover part 125 are dividedly formed based on a central portion, and the first case-molded cover part 123 and the second case-molded cover part 123 . The case-molded cover part 125 is molded through press working, respectively.

The ends of the first case molded cover part 123 and the second case molded cover part 125 are welded to each other by the case forming joint part 127 .

At this time, the case forming joint portion 127 is formed to extend from the first case forming cover unit 123 and the second case forming cover unit 123 , for example, from the first case forming cover unit 123 to form the second case. It is joined to the molded cover part 125 by friction welding. Here, the case-formed joint portion 127 and the second case-formed cover portion 125 may be joined through a MIG welding method.

In particular, the case forming joint portion 127 includes a bonding rib 127a bent downward from the end of the first case forming cover portion 123 and a second case forming cover portion 125 seated on the bonding rib 127a. and a bonding support reinforcing plate 127b formed extending from the bonding rib 127a to support the end of the .

For example, the case forming joint portion 127 is in contact with the lower surface of the second case forming cover unit 125 on its upper surface, and the first case forming cover unit 123 and the second case forming cover unit 123 are formed by a friction welding (PSW) method. The part 125 is joined. At this time, since the case forming joint portion 127 is bent downward of the first case forming cover unit 123 , the outer surfaces of the first case forming cover unit 123 and the second case forming cover unit 125 are flattened.

In addition, the case forming joint portion 127 is formed so that the joint support reinforcing plate 127b is at least three times wider and longer than the length of the joint rib 127a, so that the first case forming cover portion 123 and the second case forming cover portion are formed. The bonding strength of (125) can be further improved.

The case sealing part 130 according to the present embodiment is located between the lower assembly plate 111 of the lower case 110 and the upper assembly plate 121 of the upper case 120 and the lower case 110 coupled to each other. and the upper case 120 is sealed.

The case sealing part 130 has a hole sealing part 131 for sealing the lower assembly hole part 113 and the upper assembly hole part 121a of the lower case 110 and the upper case 120 is expanded, The assembly communication hole part 133 communicating with the lower assembly hole part 113 and the upper assembly hole part 121a is formed in the hole sealing part 131 .

In addition, the case sealing part 130, the plate sealing ribs 135 are formed to protrude on the upper surface and the lower surface to improve the sealing effect. At this time, the plate sealing ribs 135 are formed to be spaced apart from each other to further improve the sealing effect.

The lightweight battery case 100 for electric and hybrid vehicles according to the present invention configured as described above improves durability through the upper case 120 formed by pressing of an aluminum material and the lower case 110 formed by a metal material. Lightweight is possible.

In addition, in the lightweight battery case 100 for electric and hybrid vehicles according to the present invention, the upper case 120 molded of an aluminum material is formed by the first case molded cover part 123 and the second case molded cover part 125 . Since it is divided into two parts, it is possible to reduce the friction force between the aluminum material and the mold during press molding, thereby preventing the aluminum material from sticking to the mold. Through this, not only productivity can be increased, but also the rate of defects occurring in the production process can be reduced.

In addition, in the lightweight battery case 100 for electric and hybrid vehicles according to the present invention, the first case-molded cover part 123 and the second case-molded cover part 125 that are press-molded, respectively, are formed using the case forming joint part 127 . Therefore, since it can be closely joined, it is possible to prevent deterioration of durability and deterioration of sealing.

Although the present invention has been described with reference to the embodiment shown in the drawings, this is merely exemplary, and those of ordinary skill in the art to which various modifications and equivalent other embodiments are possible. will understand

Accordingly, the true technical protection scope of the present invention should be defined by the claims.

100: lightweight battery case 110: lower case
111: lower assembly plate 113: lower assembly hole part
120: upper case 120a: friction reducing part
121: upper assembly plate 121a: upper assembly hole part
123: first case molded cover part 125: second case molded cover part
127: case forming joint 127a: joint rib
127b: joint support reinforcement plate
130: case sealing part 131: hole sealing part
133: assembly communication hole 135: plate sealing rib

Claims (4)

a lower case in which a lower assembly plate is bent along an upper edge portion, a battery module and a control module are mounted therein, and is formed of a metal material; and
an upper case press-molded by an aluminum material to cover the lower case and formed by bending an upper assembly plate assembled to the lower assembly plate along an edge portion, and having a friction reducing unit for reducing friction during press molding;
Lightweight battery case for electric and hybrid vehicles comprising a.
The method of claim 1,
It further includes; a case sealing part positioned between the lower assembly plate and the upper assembly plate to seal the lower case and the upper case,
The upper case is a lightweight battery case for electric and hybrid vehicles, characterized in that the upper case is dividedly formed based on the central portion to reduce frictional force with the press during press molding and press-molded, respectively.
3. The method of claim 2,
The upper case may include a first case-molded cover unit coupled to the lower case;
a second case molded cover part coupled to the first case molded cover part to form the upper case; and
In order to join the first case molded cover part and the second case molded cover part, it is formed extending from one of the first case molded cover part and the second case molded cover part, and the other end is overlapped and welded. forming joint;
Lightweight battery case for electric and hybrid vehicles comprising a.
4. The method of claim 3,
The case forming joint portion may include: a joint rib bent downward from an end of the first case forming cover portion; and
a bonding support reinforcing plate extending from the bonding rib to support the end of the second case-molded cover portion seated on the bonding rib;
Lightweight battery case for electric and hybrid vehicles comprising a.

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