Lg Energy Solution, Ltd.

Lg Chem, Ltd

Sang Hyun Koo

Seok Jin Kim

Cha Hun Ku

Jung Hoon Lee

Su Taek Jung

Ji Hoon Lee

Dong Hyun Kim

Sung Min Hwang

Sung Jong Kim

Jung Kwan Pyo

Soo Ryoung Kim

Kyung Taek Kim

The present invention provides an apparatus for inspecting a welding state in a welded portion for an electronic or mechanical coupling in a lithium secondary battery, the apparatus including: a measuring unit configured to obtain data for deriving a resistance value of the welded portion by allowing a resistance measuring probe to contact the welded portion; and a controller configured to communicate with the measuring unit, determine the resistance value of the welded portion by receiving the data obtained from the measuring unit, and determine whether a weak welding was performed by comparing the determined resistance value with a threshold resistance value, in which the measuring unit is configured to allow the resistance measuring probe to contact one end and the other end of the welded portion.

Welding quality inspection device

A method for inspecting a welding defect of the present invention includes: a threshold resistance setting step (S) of measuring a resistance of a welded portion of a sample group and deriving a threshold resistance value which becomes an evaluation standard of a weak welding; a resistance measuring step (S) of measuring a resistance value of a welded portion to be inspected; and a step (S) of determining as a weak welding if the resistance value measured in the resistance measuring step exceeds the threshold resistance value, wherein the threshold resistance setting step (S) and the resistance measuring step (S) include measuring a resistance using a microresistance measuring instrument having a resolution of nanoohm to microohm units. The welding defect inspection method of the present invention shows excellent detection power for the welding defect by a weak welding.

Welding failure inspection method

An eddy current sensor for deriving an eddy current and sensing the derived eddy current in order to detect a crack in a battery cell, the eddy current sensor comprises: a core unit in which a coil is wound around a magnetic member; and a case for accommodating the core unit of which there are at least two, which are arranged so that the central axis of the coil is oriented in the thickness direction of the battery cell.

Eddy current sensor having improved crack detection capability, and eddy current inspection device including same

A device for detecting a crack in a battery cell, comprising: an inspection unit comprising a first sensor inducing an eddy current and a second sensor sensing a signal of the eddy current induced by the first sensor, and performing an inspection of the battery by using the eddy current while the battery cell is driven; a transfer unit for sequentially transferring a plurality of battery cells from a point where the battery cells are introduced to a point where the battery cells are taken out; and a control unit which is electrically connected to the inspection unit and receives, evaluates, and controls the eddy current signal sensed by the inspection unit.

Inspection method for crack in battery cell by using eddy current, and inspection device

The present invention relates to an electrolyte removing device. The electrolyte removing device comprises: a jig assembly configured to receive in a seated position a pouch comprising an accommodation part in which an electrode assembly is accommodated, a gas pocket part, and a connection part connecting the accommodation part to the gas pocket part; and an electrolyte removing assembly configured to push an electrolyte remaining on the connection part to the gas pocket part to remove the electrolyte from the connection part.

Electrolyte removing device, apparatus and method for manufacturing secondary battery comprising the same, and secondary battery

A jig device for inspecting quality of a secondary battery, which fixes the secondary battery and inspects quality of the secondary battery, is provided in which the jig device includes a jig base having a seating hole, a fixed module mounted on the jig base at one side of the seating hole, a first gliding module mounted on the jig base at a side opposite to the fixed module and glidable toward the fixed module, and a support part extending across the seating hole. A masking block is mounted on one or more portions of the fixed module and the first gliding module, which comes into contact with an edge of the secondary battery to fix the secondary battery. The first gliding module is detachable from the jig base, and the support part is separable from the fixed module and the first gliding module.

Jig device for inspecting quality of secondary battery

A non-destructive inspection judgment system for inspecting a non-destructive inspection subject using ultrasonic waves, including an ultrasonic wave generator transmitting and receiving ultrasonic signals by generating ultrasonic waves to the non-destructive inspection subject placed on an inspection table, an interface transmitting an ultrasonic signal received from the ultrasonic wave generator to an ultrasonic wave generation data controller, the ultrasonic wave generation data controller processing ultrasonic wave data received from the interface, a sealing defect presence judger determining, using the processed ultrasonic wave data, whether a sealing defect is present, and a display displaying a result of the judgment on a monitor to detect an unsealed portion of an aluminum pouch.

System for non-destructively inspecting and determining sealing of aluminum pouch by using ultrasonic waves

The present invention relates to an electrode assembly and a method for manufacturing the same, and more particularly, to an electrode assembly which is capable of improving an alignment of a secondary battery, realizing a high-capacity battery, and simplifying manufacturing processes of the secondary battery, and a method for manufacturing the same. The electrode assembly includes an electrode stack in which a plurality of first electrodes spaced apart from each other are disposed between two separators and second electrodes attached to both outer surfaces of the electrode stack at alternate positions of a plurality of positions on which the first electrodes are disposed, wherein, in the electrode stack, an area between the first electrode and the adjacent first electrode is folded.

Electrode assembly and method for manufacturing the same

A lamination device of the present invention includes a pattern roller part embodying a pattern on an electrode assembly, wherein the pattern roller part includes a rotation roller disposed on a surface of the electrode assembly to emit heat and a pattern cover wound around an outer circumferential surface of the rotation roller and partially pressing the surface of the electrode assembly together with the heat transferred from the rotation roller to embody a pattern, and the pattern cover includes a pattern film wound around the outer circumferential surface of the rotation roller and a deformation member disposed on an inner surface of the pattern film to wind the pattern film around the outer circumferential surface of the rotation roller while being deformed by the heat transferred from the rotation roller.

Growing community of inventors

Daejeon, South Korea

Sang Hyun Koo