Electrochemical device with alternative separator system
AssigneeLG Chem, Ltd.
InventorsJe Young Kim, Pil Kyu Park, Soonho Ahn
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Abstract
Provided is an electrochemical device comprising multi-stacked unit cells of full cells or bicells and a separation film disposed therebetween, whereby the separation film and separators are alternately stacked between electrode layers with an opposite polarity. Herein, as the separation film is formed of a material having a higher thermal shrinkage rate than that of the separator, the thermal stability of the device can be secured by stable induction of shutdown via thermal behavior of the separation film, without causing short-circuiting due to thermal shrinkage of the separator even when a temperature of a battery suddenly rises by internal or external factors.
Claims12
A stacked and folded electrochemical device comprising:
- multi-stacked unit cells of full cells or bicells;
- a separation film interposed between the stacked unit cells, and wrapping the stacked unit cells in a folding direction;
- and
- separators comprising a ceramic material or an engineering plastic, each having a melting point of more than 200° C. the ceramic material coated on a supporting material in each unit cell, the supporting material made of porous non-woven films or a polyolefin separator,
- wherein the separators of the unit cells are formed of a porous material,
- wherein the ceramic material or the engineering plastic has a low-thermal shrinkage rate, so that the separator exhibits no thermal shrinkage until at least 150° C.,
- wherein the separation film is formed of a porous material having a relatively high-thermal shrinkage rate, the separation film made of a polyolefin resin, or a copolymer or blend thereof, and
- wherein the separation film exerts shutdown functions by thermal behavior thereof at a temperature of 100 to 150° C.
Dependencies are inferred from the claim text.