Lg Chem, Ltd

Hojin Jeon

Jin Kyu Lee

Dal Mo Kang

BumHyun Lee

Jongmoon Yoon

Hee Soo Yoon

Jeeho Kim

Hanho Lee

Hey Woong Park

Sung Joon Park

Dong-Su Kim

Jonghwan Kim

Changjoo Han

Dal Moh Kang

Daesik Choi

Disclosed herein is a high-power, large-capacity battery module including a plurality of battery cells or unit modules connected in series to each other such that the battery cells or the unit modules are stacked while being in tight contact with each other or being adjacent to each other, wherein the battery module is fixed such that the stacked state of the battery cells or the unit modules is maintained even when the volume of the battery cells or the unit modules changes at the time of charging and discharging the battery cells or the unit modules, and a portion of an electrode terminal connection region between the battery cells or between the unit modules is weak with respect to the volume expansion of the battery cells or the unit modules such that an expansion stress caused by the swelling of the battery cells is concentrated on the electrode terminal connection region, whereby the electrode terminal connection region is broken, and therefore, an electrical cut-off occurs at the electrode terminal connection region, when the swelling exceeds a predetermined value.

Battery module of improved safety and middle or large-sized battery pack containing the same

Disclosed is a secondary battery comprising a lithium transition metal oxide as a cathode active material, wherein an organic ammonium compound is added to a cathode and/or is coated on a separator. Therefore, the secondary battery according to the present invention can achieve improvements in residual capacity and recovery capacity even after high-temperature storage of the battery, simultaneously with improved power retention of the battery at low and high temperatures.

Lithium secondary battery of improved performance

Growing community of inventors

Seoul, South Korea

Hojin Jeon