Lg Energy Solution, Ltd.

Lg Chem, Ltd

Joo Young Chung

Su Taek Jung

Sang Ho Bae

Dong-Myung Kim

Cha Hun Ku

Hyung Ku Yun

Byeong Kyu Lee

Jae Han Jung

Won Pill Hwang

Young Seok Baek

Yong Jun Lee

Chang Min Han

In Gu An

Tae Jong Kim

Jin Yong Lee

Jae Hwa Choi

Hun Bum Jung

Ji Hun Hwang

Jin Gon Kim

An electrode assembly manufacturing apparatus includes an electrode sheet supply unit for supplying an electrode sheet on which electrode mixture coating and non-coating portions are formed, a cutting unit at the rear of the supply unit for forming an electrode tab at the electrode sheet, and a lamination unit at the rear of the supply unit and configured to laminate positive and negative electrodes stacked with a separator between them. A cutting unit die supports the electrode sheet and an ultrasonic cutter spaced from the die forms the tab. A cutting line of a cutting edge of the cutter corresponds to a periphery of a unit electrode in a tab forming direction. The cutting and lamination units are on the same line in a continuous process to reduce a necessary space for electrode assembly manufacture and prevent electrode sheet foil deformation and electrode mixture layer damage in the cut section.

Electrode assembly manufacturing apparatus including ultrasonic cutter and method using the same

The present technology relates to a method of inspecting a welding defect. The method includes: manufacturing an electrode assembly sample by welding an electrode lead on an electrode tab formed on an electrode assembly; measuring a tensile strength, a torsional strength and a peeling strength of a welded portion between the electrode tab and the electrode lead for the electrode assembly sample; deriving correlation between whether there is a welding defect and each of the tensile strength, the torsional strength, and the peeling strength; and deriving a reference value for determining whether there is a welding defect for the tensile strength, the torsional strength, and the peeling strength, respectively.

Welding defect inspection method

The present invention provides a sealing process for a secondary battery of the present invention, which thermally fuses and seals a sealing portion that extends along an edge surface of a battery case, the sealing process comprising: an arrangement operation of disposing the sealing portion of the battery case between an anvil and a horn; a first region-fixing operation of pressing and fixing a first region of the sealing portion through the anvil and the horn; and a first region-primary sealing operation of applying an ultrasonic wave to the first region of the sealing portion through the horn at a set frequency and a set amplitude for a set time, thereby thermally fusing the first region of the sealing portion.

Secondary battery sealing process and secondary battery manufacturing method comprising the same

Disclosed is a case for secondary batteries including a laminate sheet composed of multiple layers, the laminate sheet including an insulating layer having an elongation percentage of 10% or more.

Case including insulating layer for secondary batteries and lithium secondary battery including the same

A secondary battery is provided. The secondary battery includes an electrode assembly that is sealed in a receiving portion of a pouch-type battery case together with an electrolyte. The pouch-type battery case is formed from a laminate sheet having an exterior coating layer, a metal layer and an interior adhesive layer. Additionally, electrolyte holding portion for replenishing an electrolyte that is depleted during the manufacturing process or the use of the secondary battery is disposed in the laminate sheet, without contacting the electrolyte disposed in the receiving portion of the pouch-type battery case.

Pouch-type secondary battery containing electrolyte holding part

Growing community of inventors

Daejeon, South Korea

Joo Young Chung