Battery case for electric vehicle

Abstract

The present invention discloses a case cover for a battery case of an eco-friendly vehicle. The disclosed case cover for a battery case of an eco-friendly vehicle is positioned on the upper part of a lower case to cover an upper opening of the lower case, and comprises an embossed reinforcement part for thermal insulation and rigidity reinforcement, and a flat coupling flange part that extends along the edge of the embossed reinforcement part and is coupled to the upper edge of the lower case. The embossed reinforcement part and the flat coupling flange part are formed through a press forming process of an aluminum embossed plate, characterized in that the embossed reinforcement part protrudes from the flat coupling flange part. Accordingly, the present invention can improve thermal insulation effect and durability and improve workability through the flat coupling flange part and the embossed reinforcement part.

Description

Technology Field

[0001] The present invention relates to a case cover for a battery case of an eco-friendly vehicle, and more specifically, to a case cover for a battery case of an eco-friendly vehicle in which a flat connecting flange portion, which is joined to a lower case, is formed in a flat shape by press forming an embossed aluminum plate, and the embossing of the embossing reinforcement portion is maintained as is, thereby enhancing durability while increasing the heat insulation effect through the embossing reinforcement portion, and enabling close and easy joining to the lower case using the flat connecting flange portion. Background Technology

[0003] Recently, interest in eco-friendly vehicles has been rising due to factors such as environmental issues and high oil prices, and various electric and hybrid vehicles that use electric energy to drive are being developed.

[0004] Accordingly, there has recently been a rapidly expanding and increasing trend in the development and adoption of electric vehicles (EVs) and fuel cell vehicles (FCEVs) that exclude the use of fossil fuels, as well as hybrid vehicles (HEVs) that combine the characteristics of internal combustion engines and electric vehicles.

[0005] In the case of such electric vehicles, since electric propulsion using only batteries accounts for a large proportion, high efficiency must be guaranteed for electric driving as well.

[0006] Accordingly, pouch-type battery cell units, in which a single battery cell is housed within a pouch, are widely used in battery modules for electric and hybrid vehicles. Here, multiple battery cell units are stacked and housed within a single battery pack case, and the number of battery cell units is determined according to the required power size.

[0007] In particular, recently, to reduce the weight of battery modules, battery cases protecting the battery pack are being manufactured using various lightweight materials, with aluminum being the most commonly used material. Furthermore, to increase productivity, battery cases are generally produced using a press forming method utilizing molds.

[0008] However, when using aluminum (Al) material for lightweighting, the battery case of the conventional technology described above is not only highly vulnerable to external impacts, but also frequently suffers from problems such as deformation and breakage during the molding process. Furthermore, due to the characteristics of batteries where temperature maintenance is critical, it easily heats up and cools down, leading to a decrease in battery efficiency.

[0009] Therefore, there is a need to improve this.

[0010] Meanwhile, Korean registered patent No. 10-1279416 (registration date: June 21, 2013) discloses a "battery case for a plug-in hybrid vehicle," and published patent No. 10-2018-0068379 (publication date: December 13, 2016) discloses a "battery case for an electric vehicle." The problem to be solved

[0012] The present invention was created out of the above-mentioned necessity, and aims to provide a case cover for a battery case of an eco-friendly vehicle that allows for easy and tight connection when combined with a lower case by forming a flat connecting flange portion that is joined to a lower case through press forming of an embossed aluminum plate, thereby maintaining the embossing of the embossing reinforcement portion, and thereby increasing the heat insulation effect of the battery case through the embossing reinforcement portion and improving durability, and by using the flat connecting flange portion to allow for easy and tight connection. means of solving the problem

[0014] To achieve the above-mentioned purpose, a case cover for a battery case of a vehicle according to one aspect of the present invention is characterized by comprising an embossed reinforcing member for heat insulation and rigidity reinforcement, which is positioned on the upper part of the lower case to cover the upper opening of the lower case, and a flat coupling flange member that is formed to extend along the edge of the embossed reinforcing member and coupled to the upper edge of the lower case.

[0015] In addition, in the present invention, the embossing reinforcement part and the flat coupling flange part are formed through a press forming process of an aluminum embossing plate, and the embossing reinforcement part is characterized by protruding from the flat coupling flange part.

[0016] In addition, the embossing reinforcement in the present invention is characterized by having a height of 1.4 mm.

[0017] In addition, the aluminum embossing plate in the present invention is characterized by passing through an embossing roller to form an embossing of a certain pattern. Effects of the invention

[0019] As explained above, unlike the prior art, the case cover for a battery case of an eco-friendly vehicle according to one aspect of the present invention forms a flat coupling flange portion that is coupled to a lower case through press forming of an embossed aluminum plate in a flat shape, and allows the embossing of the embossing reinforcement portion to be maintained as is. Therefore, it is possible to increase the heat insulation effect of the battery case through the embossing reinforcement portion and simultaneously improve durability, and also to easily and tightly connect it to the lower case using the flat coupling flange portion, thereby improving the workability of the assembly process. Brief explanation of the drawing

[0021] FIG. 1 is a perspective view illustrating a case cover for a battery case of an eco-friendly vehicle according to one embodiment of the present invention. FIG. 2 is a cross-sectional view illustrating a case cover for a battery case of an eco-friendly vehicle according to one embodiment of the present invention. FIG. 3 is an enlarged view of a key part to explain a case cover for a battery case of an eco-friendly vehicle according to one embodiment of the present invention. Specific details for implementing the invention

[0022] Hereinafter, a preferred embodiment of a case cover for a battery case of an eco-friendly vehicle according to the present invention will be described with reference to the attached drawings. In this process, the thickness of lines or the size of components shown in the drawings may be exaggerated for clarity and convenience of explanation.

[0023] Furthermore, the terms described below are defined in consideration of their functions in the present invention, and these may vary depending on the intent or practice of the user or operator. Therefore, the definitions of these terms should be based on the content throughout this specification.

[0025] FIG. 1 is a perspective view for explaining a case cover for a battery case of an eco-friendly vehicle according to one embodiment of the present invention, FIG. 2 is a cross-sectional view for explaining a case cover for a battery case of an eco-friendly vehicle according to one embodiment of the present invention, and FIG. 3 is an enlarged view of a key part for explaining a case cover for a battery case of an eco-friendly vehicle according to one embodiment of the present invention.

[0027] As illustrated in FIGS. 1 to 3, a case cover (100) for a battery case of an eco-friendly vehicle according to one embodiment of the present invention is coupled to a lower case (200) through bolts and nuts to seal the lower case (200) in which a battery is housed.

[0028] Here, the lower case (200) has an open top surface for installing a battery, and a lower flange portion (210) is formed by bending it outward so that a case cover (100) can be attached to the upper edge portion. A fastening hole for fastening a bolt is formed in the lower flange portion (210).

[0029] Additionally, the lower case (200) can be press-formed from a high-strength steel plate of 440 MPa grade or SPRC440 so as to have sufficient durability while being lightweight.

[0030] Meanwhile, the case cover (100) for a battery case of an eco-friendly vehicle according to the present embodiment includes a large embossed reinforcement part (110) and a flat connecting flange part (120) formed on the edge of the embossed reinforcement part (110) so as to reduce the overall weight of the battery case, improve the heat insulation effect, and improve assembly.

[0031] At this time, the case cover (100) for the battery case of an eco-friendly vehicle has its durability reinforced by the embossing reinforcement part (110) and its heat insulation effect improved, and can be closely and easily connected with the lower flange part (210) through the flat connecting flange part (120).

[0032] The case cover (100) for the battery case of such an eco-friendly vehicle is designed to seal the lower case (200), and since it is formed using an aluminum material, the entire battery case can be made lighter.

[0033] The embossing reinforcement (110) according to the present embodiment covers the upper opening of the lower case (200), and an embossing (111) having concave and convex portions is formed in a uniform pattern. This can increase the heat insulation effect and improve durability against external impacts or loads.

[0034] Additionally, the embossing reinforcement (110) is formed such that the shape of the embossing (111) is semicircular, the radius (R) of the embossing (111) is 1.4 mm, and the distance (L) between the vertices of the concave and convex parts is 4.5 mm.

[0035] Additionally, the embossing reinforcement (110) can be formed with a total height (H) of 1.7 mm for the concave and convex portions.

[0036] According to the present embodiment, the flat coupling flange portion (120) is formed to extend along the edge of the embossing reinforcement portion (110) and comes into contact with the lower flange portion (210) of the lower case (200). At this time, the contact surface of the flat coupling flange portion (120) is formed flat so as to make close contact with the lower flange portion (210), and is firmly coupled to the lower case (200) through the fastening of a bolt and nut.

[0037] Such a flat joint flange portion (120) is formed through a press molding process of a case cover (100) for a vehicle battery case. For example, as the flat joint flange portion (120) is press molded more strongly than the embossing reinforcement portion (110), the embossing is removed and the surface is flattened.

[0038] In addition, a fastening hole for fastening a bolt is formed in the flat joint flange portion (120).

[0039] At this time, the case cover (100) for the vehicle's battery case is formed such that the embossed reinforcement (110) protrudes from the flat lower flange (210) through a press forming process of an aluminum plate. This allows for further improvement of overall durability and secures more internal space for the battery case.

[0040] A case cover (100) for a battery case of an eco-friendly vehicle according to the present invention can be manufactured through a first step of forming an embossing on an aluminum plate by passing the aluminum plate through an embossing roller, a second step of cutting the embossed aluminum plate to a specific length, and a third step of inserting the cut embossed aluminum plate into a press to form an embossing reinforcement part (110) and a flat connecting flange part (120).

[0041] At this time, the third step may involve at least two press processes to reduce defects when forming the embossing reinforcement part (110) and the flat joint flange part (120).

[0042] The case cover (100) for a battery case of an eco-friendly vehicle according to the present invention, configured as described above, forms an embossed reinforcing part (110) and a flat connecting flange part (120) by press-forming an embossed aluminum plate, thereby improving the heat insulation effect of the battery case and enhancing durability through the embossed reinforcing part (110).

[0043] In addition, the case cover (100) for a battery case of an eco-friendly vehicle according to the present invention has a flat coupling flange portion (120) that is coupled to a lower case (200) formed in a flat shape, so it can be easily assembled to the lower flange portion (210) of the lower case (200) and also allows for a tight coupling. Through this, the workability of the assembly process can be improved.

[0044] Although the present invention has been described with reference to the embodiments illustrated in the drawings, this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible therefrom.

[0045] Therefore, the true technical scope of protection of the present invention should be determined by the patent claims. Explanation of the symbols

[0047] 100 : Battery cover 110 : Embossed reinforcement 111 : Embossing 120 : Flat joint flange section 200 : Lower case 210 : Lower flange section

Claims

Claim 1 A case cover for a battery case of an eco-friendly vehicle, comprising: an embossed reinforcing member positioned on the upper part of the lower case to cover the upper opening of the lower case and for reinforcing heat insulation and rigidity; and a flat connecting flange member formed extending along the edge of the embossed reinforcing member and coupled to the upper edge of the lower case; wherein the embossed reinforcing member and the flat connecting flange member are formed through a press forming process of an aluminum embossed plate, and the embossed reinforcing member protrudes from the flat connecting flange member. Claim 2 A case cover for a battery case of an eco-friendly vehicle, characterized in that, in claim 1, the embossed reinforcing portion has a height of 1.7 mm. Claim 3 A case cover for a battery case of an eco-friendly vehicle, characterized in that, in claim 1 or 2, the aluminum embossing plate is passed through an embossing roller to form an embossing of a certain pattern.

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