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KR-20260067167-A - Tensile test machine for welding busbar and Tensile test method using the same

KR20260067167AKR 20260067167 AKR20260067167 AKR 20260067167AKR-20260067167-A

Abstract

A busbar tensile force testing device is disclosed, characterized by comprising: a bottom frame; a busbar clamp part installed on the bottom frame and clamping a busbar; a specimen clamp part located above the busbar clamp part and clamping a specimen welded to the busbar; a tensile driving part for tensile driving the specimen clamp part; and a horizontal position adjustment part capable of adjusting the horizontal position of the busbar clamp part with respect to the bottom frame. Accordingly, there is an advantage that not only can tensile tests and peel tests be implemented separately, but tensile tests and peel tests can also be performed sequentially on multiple specimens with simple operation.

Inventors

  • 최황순
  • 윤상훈

Assignees

  • 주식회사 유라코퍼레이션

Dates

Publication Date
20260512
Application Date
20241105

Claims (11)

  1. Floor frame (1100); A busbar clamp part (1200) installed on the floor frame (1100) and clamping the busbar (10); A specimen clamp part (1300) located above the busbar clamp part (1200) and clamping a specimen (20) welded to the busbar (10); A tension drive unit (1400) for tensioning the specimen clamp unit (1300); and A horizontal position adjustment unit (1500) capable of adjusting the horizontal position of the busbar clamp unit (1200) with respect to the floor frame (1100); A busbar tensile strength testing device characterized by including
  2. In Article 1, The above horizontal position adjustment unit (1500) is, A lateral position adjustment unit (1510) that allows the busbar clamp unit (1200) to be moved left and right relative to the floor frame (1100) based on the front of the busbar clamp unit (1200); A busbar tensile strength testing device characterized by including
  3. In Article 1, The above horizontal position adjustment unit (1500) is, A front-rear position adjustment unit (1550) that allows the busbar clamp unit (1200) to be moved back and forth relative to the floor frame (1100) based on the front of the busbar clamp unit (1200); A busbar tensile strength testing device characterized by including
  4. In Article 2, The above horizontal position adjustment unit (1500) is, A front-rear position adjustment unit (1550) that allows the busbar clamp unit (1200) to be moved back and forth relative to the floor frame (1100) based on the front of the busbar clamp unit (1200); A busbar tensile strength testing device characterized by further including
  5. In Article 4, The above lateral position adjustment unit (1510) is, A left and right moving rail (1511) installed on the upper surface of the floor frame (1100); An intermediate frame (1512) installed to be positioned above the left-right movement rail (1511) and capable of moving left and right; and A left-right movement bearing (1513) installed on the above intermediate frame (1512) and in contact with the above left-right movement rail (1511); Includes, The above front and rear position adjustment unit (1550) is, A rail (1551) for forward and backward movement installed in the forward and backward direction on the upper surface of the intermediate frame (1512); and A forward-backward movement bearing (1552) installed on the lower surface of the busbar clamp part (1200) and in contact with the forward-backward movement rail (1551); A busbar tensile strength testing device characterized by including
  6. In Article 1, The above specimen clamp part (1300) is, A fixing projection (1310) formed to be inserted into a fixing hole (21) for tensile testing formed in the specimen (20); A busbar tensile strength testing device characterized by including
  7. In Article 1, The above busbar clamp part (1200) is, A corner fixing slot (1210) formed by being recessed so that the corner of the bus bar (10) can be inserted so as to fix the bus bar (10) in the width direction; A busbar tensile strength testing device characterized by further including
  8. In a busbar tensile strength testing method using a busbar tensile strength testing device according to any one of claims 1 to 7, Step (S1100) of preparing a busbar in which a plurality of specimens (20) are welded in the longitudinal direction of the busbar (10); A first busbar fixing step (S1200) of fixing the above busbar (10) to the busbar clamp part (1200) in the thickness direction; A horizontal position adjustment step (S1300) in which one of the plurality of specimens (20) is positioned at the bottom of the specimen clamp part (1300) by driving the horizontal position adjustment part (1500); A specimen fixing step (S1400) of fixing the specimen (20) to the specimen clamp part (1300); and A tensile test step (S1500) in which the above tensile drive unit (1400) is driven to apply force until the specimen (20) is separated from the bus bar (10); A busbar tensile strength test method characterized by including
  9. In Article 8, After the above tensile test step (S1500), A busbar tensile strength test method characterized by repeating the horizontal position adjustment step (S1300), the specimen fixing step (S1400), and the tensile test step (S1500) for as many times as the number of specimens (20) fixed to the busbar (10).
  10. In a busbar tensile strength testing method using a busbar tensile strength testing device according to any one of claims 1 to 7, Step (S1100) of preparing a busbar in which a plurality of specimens (20) are welded in the longitudinal direction of the busbar (10); A second busbar fixing step (S1600) of fixing the above busbar (10) to the busbar clamp part (1200) in the longitudinal direction; A horizontal position adjustment step (S1300) in which one of the plurality of specimens (20) is positioned at the bottom of the specimen clamp part (1300) by driving the horizontal position adjustment part (1500); A specimen fixing step (S1400) of fixing the specimen (20) to the specimen clamp part (1300); and A tensile test step (S1500) in which the above tensile drive unit (1400) is driven to apply force until the specimen (20) is separated from the bus bar (10); A busbar tensile strength test method characterized by including
  11. In Article 10, After the above tensile test step (S1500), A busbar tensile strength test method characterized by repeating the horizontal position adjustment step (S1300), the specimen fixing step (S1400), and the tensile test step (S1500) for as many times as the number of specimens (20) fixed to the busbar (10).

Description

Busbar Tensile Test Machine and Busbar Tensile Test Method Using the Same The present invention relates to a busbar tensile strength testing device, and more specifically, to a busbar tensile strength testing device necessary for testing the welding quality of a busbar, which is a component of a battery pack used in electric vehicles, and a terminal welded thereto, and a busbar tensile strength testing method using the same. Unless otherwise indicated in this specification, the contents described in this identification item are not prior art for the claims of this application, and are not recognized as prior art simply because they are described in this identification item. An electric vehicle battery pack contains multiple battery cells, and efficiently connecting these cells is essential. The electrical connection between battery cells plays a crucial role in maintaining the battery pack's performance and ensuring smooth current flow. Busbars are used for this purpose, and they are electrically connected by welding them to the electrode terminals of each battery cell. Previously, connections between battery cells and busbars were made using flat welding. However, this method lacks sufficient welding strength, which can lead to poor electrical contact and consequently result in reliability issues. This problem is particularly pronounced in battery packs requiring high output and long lifespan, such as those found in electric vehicles. Accordingly, US Patent 12,066,503 (Patent Document 1) presents a technology that improves existing planar welding methods by introducing a welding protrusion having a non-planar joining surface to increase welding strength and ensure joining reliability. However, despite improvements such as those described in Patent Document 1, welding defects may occur, and in order to prevent such problems in advance, tensile tests are performed periodically to verify the reliability of the welding between the busbar and the terminal. There is a problem in that every time such tensile tests are performed, not only the terminals but also the busbars and the injection-molded parts to which the busbars are attached are wasted for testing. Moreover, there is a disadvantage in that the process of attaching the injection molded part with the bus bar to the tensile testing machine during testing is very cumbersome. FIG. 1 is a planar photograph of a busbar welding jig according to an embodiment of the present invention. FIG. 2 is a planar photograph of FIG. 1 with the pressurizing part located in the separated position. Figure 3 is a plan view of the mounting block. FIG. 4 is a right side view of the busbar welding jig of FIG. 1. FIG. 5 is a front view of the busbar welding jig of FIG. 1. FIG. 6 is a plan view of the fixing jig of FIG. 1. FIG. 7 is a plan view of the mounting block of FIG. 1. FIG. 8 is a plan view of the pressurizing part of FIG. 2. FIG. 9 is a flowchart sequentially illustrating a method for fabricating a busbar welding specimen according to an embodiment of the present invention. FIG. 10 is a perspective view of the completed busbar and specimen combined when the busbar welding specimen fabrication method of FIG. 9 is performed sequentially. FIG. 11 is a front view of a busbar tensile force testing device according to an embodiment of the present invention. FIG. 12 is a side view illustrating a part of FIG. 11. FIG. 13 is a side view of the specimen clamp of FIG. 11 in a locked state. FIG. 14 is a side view of the specimen clamp of FIG. 13 in an open state. FIG. 15 is a perspective view of a busbar fixed to a busbar tensile force testing device for a tensile test of the busbar. FIG. 16 is a perspective view of a busbar fixed to a busbar tensile strength testing device for a busbar peel test. FIG. 17 is a flowchart sequentially illustrating a busbar tensile strength test method for a busbar tensile test. FIG. 18 is a flowchart sequentially illustrating a busbar tensile strength test method for a busbar peel test. Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view of a busbar welding jig according to an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1 in which the pressing part is located at a separated position, FIG. 3 is a plan view of a seating block, FIG. 4 is a right side view of the busbar welding jig of FIG. 1, FIG. 5 is a front view of the busbar welding jig of FIG. 1, FIG. 6 is a plan view of the fixing jig of FIG. 1, FIG. 7 is a plan view of the seating block of FIG. 1, and FIG. 8 is a plan view of the pressing part of FIG. 2. First, before describing the busbar welding jig, the shape of the busbar (10) and specimen (20) used in the busbar welding jig will be described. As shown in FIG. 3, the busbar (10) is formed as a flat plate in the shape of a square ring, and a busbar fixing groove (11) is formed through the upper and lower sides so that a protrusion of th