Lg Chem, Ltd

Su-Hyun Kim

Jae-Hyun Lee

Su-Rim Lee

Song-Taek Oh

Ji-Hyun Kim

Du-Seong Yoon

Hye-Won Jeong

The present disclosure relates to a cathode including a cathode active material and poly(amic acid). When the lithium secondary battery including the cathode is in an abnormal operation range of 160&#xb0; C. or higher, condensation reaction of poly(amic acid) occurs to form polyimide. The polyimide surrounds cathode active material particles in the form of a coating film and prevents transport of lithium ions and electrons to interrupt current flow, and inhibits abnormal heat emission and thermal runaway or combustion caused by additional reactions.

Cathode having improved safety and lithium secondary battery including the same

Disclosed is a battery cell having an electrode assembly configured as a structure in which a cathode, an anode, and a separator interposed between the cathode and the anode, wherein a surface or both surfaces of respective electrode current collectors of the cathode and the anode are coated with an electrode mixture including an electrode active material, the cathode and the anode are provided with a first cathode terminal and a first anode terminal respectively serving as external input/output terminals of the battery cell, and at least one of the cathode and the anode is provided with a resistance measurement terminal at a position opposite to the external input/output terminal, for measuring a resistance of an electrode current collector.

Battery cell capable of measuring inner temperature thereof

Provided are a device and method for measuring the thickness of a secondary battery cell. The device comprises: a mounting stand on which a secondary battery cell is positioned; a pressurizing plate which is installed so as to be variable in distance from the mounting stand; a pressurizing device which pushes or pulls the pressurizing plate; a measurement device for measuring the pressurization force applied to the pressurizing plate; and a controller which is configured to control charging, discharging or temperature of the secondary battery cell according to measurement conditions, receive a pressurization force measurement value and a thickness measurement value from the measurement device to thereby determine the magnitude of the pressurization force applied to the pressurizing plate and the thickness of the secondary battery cell, and vary, or maintain the pressurization force applied to the pressurizing plate to be constant.

Growing community of inventors

Daejeon, South Korea

Su-Hyun Kim