KR-20260062666-A - MANUFACTURING METHOD OF ALUMINUM UPPER COVER FOR BATTERY CASE

Abstract

The present invention discloses a method for manufacturing an aluminum upper cover for a battery case that can improve the rigidity of the upper cover by forming an embossed portion on an aluminum plate and then forming the upper cover by a hot forming method. The disclosed method for manufacturing an aluminum upper cover for a battery case comprises: a supply step of supplying an aluminum plate in the longitudinal direction; a processing step of forming an embossing portion in which concave and convex portions are alternately formed in the thickness direction on the aluminum plate supplied from the supply step; a heating step of receiving the aluminum plate from the processing step and heating it; a forming step of forming an upper cover from the aluminum plate heated by the heating step; and a separation cooling step of reforming the upper cover from the aluminum plate so as to be restrikeable and cooling the upper cover so as to be separated from the aluminum plate.

Inventors

• 서승구

Assignees

• (주) 영진

Dates

Publication Date

20260507

Application Date

20241029

Claims (4)

1. A supply step for supplying aluminum plates in the longitudinal direction; A processing step for forming an embossing portion in which concave and convex shapes are alternately formed in the thickness direction on the aluminum plate supplied from the above supply step; A heating step of receiving the aluminum plate from the above processing step and heating it; A forming step of forming an upper cover from the aluminum plate heated by the above heating step; and A separation cooling step of restrapping the upper cover from the aluminum plate to enable restrapping and cooling the upper cover from the aluminum plate so as to enable separation; A method for manufacturing an aluminum upper cover for a battery case, characterized by including
2. In paragraph 1, A method for manufacturing an aluminum upper cover for a battery case, characterized in that the above aluminum plate is made of an aluminum 6000 series alloy with magnesium and silicon added.
3. In paragraph 2, The above heating step is, A first heating step of heating the aluminum plate supplied from the above supply step using a high-frequency induction heating method; and A second heating step of heating the aluminum plate heated in the first heating step while transporting it in the longitudinal direction in a heating furnace; A method for manufacturing an aluminum upper cover for a battery case, characterized by including
4. In paragraph 2, The above forming step forms the upper cover from the aluminum plate through die drawing processing of a forming press machine using a die and a punch, and A method for manufacturing an aluminum upper cover for a battery case, characterized in that the above-mentioned separate cooling step involves reshaping the upper cover in the same manner as the method processed by the die drawing of the above-mentioned forming step using a cooling press machine utilizing a die and a punch, and trimming the upper cover to a set specification while cooling it using cooling water during the reshaping step.

Description

Manufacturing Method of Aluminum Upper Cover for Battery Case The present invention relates to a method for manufacturing an aluminum upper cover for a battery case, and more specifically, to a method for manufacturing an aluminum upper cover for a battery case that can improve the rigidity of the upper cover by forming the upper cover by a hot forming method after forming an embossed portion on an aluminum plate. Generally, an electric vehicle is a vehicle that uses an electric motor to drive the vehicle, and it is essential to be equipped with a high-voltage battery pack that provides driving power to the electric motor. Such high-voltage battery packs are configured to supply the necessary power by repeatedly charging and discharging during vehicle operation, and typically comprise a battery case, multiple battery modules mounted within the battery case, and a Battery Management System (BMS) that detects the voltage, current, and temperature of each unit cell constituting the battery module and controls its operation. In this case, battery cases are typically made of steel or aluminum. While steel battery cases have the advantages of being cheaper and providing high strength compared to aluminum, they have the disadvantages of being heavy and negatively impacting fuel efficiency. Consequently, the use of battery cases made of aluminum alloys has recently been increasing, as they offer good thermal conductivity and allow for weight reduction to achieve lightweight design and improved fuel efficiency. In this way, when manufacturing battery cases using high-strength aluminum alloy materials, they are produced through cold forming using a standard press. However, when manufacturing battery cases from aluminum alloy materials using conventional cold forming methods, while battery cases with simple shapes can be easily formed, battery cases with complex shapes are not only very difficult to form, but also suffer from the problem of springback occurring after forming is completed. Therefore, there is a need to improve this. A related background technology is Korean Registered Patent Publication No. 10-2412925 (Registered June 21, 2022, Title: Aluminum Case). FIG. 1 is a block diagram illustrating the sequence of a method for manufacturing an aluminum upper cover for a battery case according to the present invention. FIG. 2 is a conceptual diagram illustrating a method for manufacturing an aluminum upper cover for a battery case according to the present invention. FIG. 3 is a perspective view illustrating an upper cover formed by the method for manufacturing an aluminum upper cover for a battery case according to the present invention. Hereinafter, an embodiment of the method for manufacturing an aluminum upper cover for a battery case according to the present invention will be described with reference to the attached 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. 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. FIG. 1 is a block diagram illustrating the sequence of a method for manufacturing an aluminum upper cover for a battery case according to the present invention, FIG. 2 is a conceptual diagram illustrating a method for manufacturing an aluminum upper cover for a battery case according to the present invention, and FIG. 3 is a perspective view illustrating an upper cover formed by a method for manufacturing an aluminum upper cover for a battery case according to the present invention. As illustrated in FIGS. 1 to 3, a method for manufacturing an aluminum upper cover for a battery case according to one embodiment of the present invention includes a supply step (S10), a processing step (S20), a heating step (S30), a molding step (S40), and a separation cooling step (S50). The supply step (S10) is a step of supplying an aluminum plate (10) in the longitudinal direction. Here, it is preferable that the aluminum plate (10) be made of an aluminum 6000 series alloy with added magnesium and silicon, which can secure appropriate strength through subsequent heat treatment (artificial aging) after hot forming. At this time, the supply step (S10) uses a feeder (100) to unwind an aluminum plate (10) wound in a roll shape, supplies it to a set length, and then repeats the operation of temporarily stopping. And, the processing step (S20) is a step of forming an embossing portion (11) in which concave and convex shapes are alternately formed in the thickness direction on the aluminum plate (10) supplied from the supply step (S10). Of course, although the embossing portion (10) is shown as a circle in the drawing, it is not limited thereto and can be modified