KR-20260062410-A - BATTERY CELL COVER FOR ELECTRIC VEHICLE AND MANUFACTURING METHOD THEREOF

Abstract

The present invention relates to a method for manufacturing a cover for an electric vehicle battery cell, comprising the steps of: pre-cutting to fit the size of the cover; forming a first receiving portion; forming a second receiving portion to form a step between the first receiving portion and the second receiving portion; forming a protrusion on one side of the edge of the cover; forming a plurality of fastening holes; and cutting along the edge to fit the shape of the cover. By enabling the shape of the electric vehicle battery cell to be manufactured through multiple processes, the accuracy of the product shape or dimensions can be increased.

Inventors

• 신창열
• 김태엽
• 김재환

Assignees

• (주)케이테크

Dates

Publication Date

20260507

Application Date

20241029

Claims (2)

1. In a method for manufacturing a cover for an electric vehicle battery cell, A step of pre-cutting to fit the size of the cover, and A step of forming the first receiving portion, and A step of forming a second receiving portion to form a step difference between the first receiving portion and the second receiving portion, and A step of forming a protrusion on one side of the edge of the cover, and A method for manufacturing a cover for an electric vehicle battery cell, characterized by comprising the steps of forming a plurality of fastening holes and cutting along the edges to match the shape of the cover.
2. A cover for an electric vehicle battery cell manufactured by the manufacturing method of claim 1.

Description

Battery cell cover for electric vehicle and manufacturing method thereof The present invention relates to a cover for a battery cell for an electric vehicle and a method for manufacturing the same. An electric vehicle (EV) refers to a vehicle that obtains power by driving an AC or DC motor primarily using power from a battery, and the battery, which serves as the power source, is indispensable for such electric vehicles. Generally, batteries used in electric vehicles are modularized and consist of a storage battery equipped with an electrolyte, containing a positive plate, a negative plate, and a separator installed inside a battery cell case. It undergoes a repeated electrochemical process of being charged to its rated capacity by a generator and discharging as electricity consumption increases. As such, since the battery is a core component of an electric vehicle, it can be sealed with a cover to protect it from external shocks, heat, and vibrations. To manufacture these battery cells, an aluminum sheet is fixed to a mold and formed into a rectangular shape through a drawing process in which it is pressed with a punch. Subsequently, a restriking process can be performed to re-press the drawn portion to ensure the product's shape and dimensions are accurate. Afterward, the battery cell cover can be manufactured through processes such as trimming, forming, and flanging. However, in these conventional battery cell manufacturing methods, deformation of the sheet metal during the drawing process is concentrated near the corners, resulting in localized slight thickness changes and residual stress distribution. This non-uniform stress distribution, concentrated only at the corners of a wide rectangular battery cell shape, can cause warping and spring-back after forming the final product. In particular, as the thickness of the sheet metal decreases or the aspect ratio (length-to-width ratio) increases, deformation and stress distribution at the corners increase. Recently, as the demand for vehicle lightweighting has increased, the thickness of the raw materials used has become even thinner, leading to a problem where warping or springback phenomena in battery cell components have become more severe. FIG. 1 is a diagram showing the configuration of a cover for an electric vehicle battery cell according to an embodiment of the present invention. FIG. 2 is a flowchart of a method for manufacturing a cover for an electric vehicle battery cell according to an embodiment of the present invention, FIGS. 3 to 7 are drawings illustrating the process sequence according to the method for manufacturing a cover for an electric vehicle battery cell according to an embodiment of the present invention. Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. FIG. 1 is a diagram showing the configuration of a cover for an electric vehicle battery cell according to an embodiment of the present invention. The battery cell for an electric vehicle according to the present invention may be composed of first and second receiving portions (20)(30), a step (40), a fastening hole (50), a protrusion (60), and a cutting portion (70). The first and second receiving portions (20)(30) may be formed concavely so that a battery cell can be received, and a step (40) may be formed between the first and second receiving portions (20)(30) to fit the receiving structure of the internal battery cell. A plurality of fastening holes (50) for fastening the cover (100) are formed along the edges of the first and second receiving portions (20) (30), a protrusion (60) is formed on one side of the edge, and a cutting portion (70) is formed along the outer edge along the fastening holes (50) to be cut to fit the shape of the cover (100). FIG. 2 is a flowchart of a method for manufacturing a cover for an electric vehicle battery cell according to an embodiment of the present invention. The cover of the battery cell for an electric vehicle according to the present invention is manufactured by the steps of: pre-cutting to fit the size of the cover (100); forming a first receiving portion (20); forming a second receiving portion (30) so that a step (40) is formed between the first receiving portion (20) and the second receiving portion (30); forming a protrusion (60) on one side of the edge of the cover (100); forming a plurality of fastening holes (50); and cutting along the edge to fit the shape of the cover (100). In the above preliminary cutting step, as shown in FIG. 3, the metal plate (10) is cut to prepare for molding in order to manufacture the cover (100), and the metal plate (10) is transferred to the next process. The pre-cut metal plate (10) is formed in a rectangular shape consisting of a pair of short sides and a pair of long sides, and the long side formed on the pair of long side sides can be fixed. As an example, the above-mentioned pre-cut metal plate (10) may be a thin sheet of al