This technology features a structure where a gasket with integrated channels is placed at the housing interface of a liquid metal battery unit, connecting the interior of the battery unit to the chamber space. A single gas line outside the chamber removes internal air and injects inert gas to prevent explosion risks, while reducing gas bottlenecks and connection resistance during series connection.
Liquid metal batteries, where both electrodes and electrolytes are in a liquid state, pose an explosion risk if external air enters. Furthermore, when cells are connected in series for high-capacity applications, bottlenecks occur during gas injection and discharge, and electrical connection resistance between multiple cells increases.
This technology is configured to control gas exchange by providing channels in the gasket that connect the first and second internal spaces and connecting a gas line to the chamber. By setting different gasket channel directions for each series-connected battery unit and electrically connecting each housing to different points in the chamber, current flow overlap is reduced. It can be applied to large-capacity grid-connected ESS and long-duration storage facilities for renewable energy plants, ensuring that gas purging and wiring structures do not become complex even as the number of cells increases.
This invention was developed with support from the Ministry of Trade, Industry and Energy for the cost reduction and component development of liquid metal secondary batteries for ESS.
WO2019-031646A1
