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AssigneeLG Chem, Ltd.
InventorsJe Young Kim, Pil Kyu Park, Soonho Ahn, Sang-Young Lee, SeokKoo Kim, Young Tae Lee
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Provided is an electrochemical device comprising two types of separators having different energy to break, wherein the outermost electrode layer of the electrode assembly includes an active material non-coated cathode, an active material non-coated anode, and a separator (second separator) disposed between the cathode and anode and having relatively low energy to break compared to that of separators (first separator) in other electrode layers. Therefore, it is possible to remarkably improve safety of the battery by inducing primary short-circuiting in the outermost electrode layer of a battery, thus facilitating heat dissipation of the battery, upon application of external impact.
An electrochemical device comprising an electrode assembly including a cathode, an anode and a separator disposed between the cathode and the anode, wherein the outermost electrode layer of the electrode assembly includes an active material non-coated cathode, an active material non-coated anode and a second separator disposed between the cathode and anode and having a relatively low energy to break compared to that of a first separator in other electrode layers, wherein the electrode layer including the second separator is positioned at both uppermost and lowermost electrode layers of the electrode assembly.
Dependencies are inferred from the claim text.