IP Library › Granted Patent US 12661730
Granted Patent B2
US 12661730 · App. 17/855,084 · Granted Jun 23, 2026

Method of manufacturing welded structure, welded structure, and battery case

Inventors: Wook Han Choi (Yongin-si, KR); Lee Seung Park (Yongin-si, KR)
Assignee: Hyundai Mobis Co., Ltd.
B23K9/0026B23K9/025B23K9/16B23K20/122B23K35/38B23K2101/36B23K2103/10
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Quick Facts
Patent No.
US 12661730
App. No.
17/855,084
Granted
Jun 23, 2026
Kind
B2
Abstract

A method of manufacturing a welded structure includes a preparation operation of arranging a first member to overlap a second member; a first welding operation of forming a first welding line on a first surface of the first member by welding a portion at which the first member overlaps the second member, the first surface of the first member being a surface of the first member facing the second member; a second welding operation of forming a second welding line on a second surface of the first member by welding the portion at which the first member overlaps the second member, the second surface of the first member being a surface opposite to the first surface; and connecting the first welding line to the second welding line.

Claims (24)

1 . A method of manufacturing a welded structure, the method comprising:

a preparation operation of arranging a first member to overlap a second member;

a first welding operation of forming a first welding line on a first surface of the first member by welding a portion at which the first member overlaps the second member, the first surface of the first member being a surface of the first member facing the second member, the first welding operation including forming a welding hole passing through the first member;

a second welding operation of forming a second welding line on a second surface of the first member by welding the portion at which the first member overlaps the second member, the second surface of the first member being a surface opposite to the first surface, the second welding operation including filling the welding hole,

wherein the second welding operation connects the first welding line to the second welding line such that a start point and an end point of the first welding line are connected to the second welding line and a start point and an end point of the second welding line are connected to the first welding line, so that the first welding line and the second welding line are connected to each other to form a closed-loop shape along a circumferential region of the first member.

2 . The method of claim 1 , wherein the first welding line includes a plurality of first welding lines spaced apart from each other, and

the second welding line includes plurality of second welding lines, and each of the second welding lines is connected to an adjacent first welding line.

3 . The method of claim 1 , wherein the first welding operation and the second welding operation are performed by different welding methods.

4 . The method of claim 1 , wherein, in the first welding operation, the first welding line is formed on the first surface using a first welding machine, and

in the second welding operation, the second welding line is formed on the second surface using a second welding machine that is a component separate from the first welding machine.

5 . The method of claim 1 , wherein the first welding operation is performed by arc welding, and

the second welding operation is performed by friction stir welding (FSW).

6 . The method of claim 5 , wherein the first welding operation is performed by any one of metal inert gas (MIG) welding and tungsten inert gas (TIG) welding.

7 . The method of claim 1 , wherein the first member and the second member are made of aluminum or aluminum alloy.

8 . A welded structure comprising:

a first member including a first surface and a second surface opposite to the first surface; and

a second member joined to the first surface of the first member,

wherein the first member and the second member are joined to each other by a first welding line formed on the first surface of the first member and a second welding line formed on the second surface of the first member after the first welding line is formed, and

wherein the first welding line and the second welding line are connected to each other by completion of the second welding line being formed such that a start point and an end point of the first welding line are connected to the second welding line and a start point and an end point of the second welding line are connected to the first welding line, so that the first welding line and the second welding line are connected to each other to form a closed-loop shape along a circumferential region of the first member.

9 . A battery case comprising:

a support panel including a first surface and a second surface opposite to the first surface; and

a frame joined to the first surface of the support panel and disposed along a circumferential region of the support panel,

wherein the support panel is joined to the frame by a first welding line formed on the first surface and a second welding line formed on the second surface after the first welding line is formed, and

wherein the first welding line and the second welding line are connected to each other by completion of the second welding line being formed such that a start point and an end point of the first welding line are connected to the second welding line and a start point and an end point of the second welding line are connected to the first welding line, so that the first welding line and the second welding line are connected to each other to form a closed-loop shape along a circumferential region of the line and the second welding line form a closed loop along the circumferential region of the support.