Electrochemical element for inducing internal short circuit, and method for evaluating safety using same
AssigneeLG Energy Solution, Ltd.
InventorsTae Jong Kim, Seo Young Yoon
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Abstract
The present technology relates to: an electrochemical element which comprises a separator having through-holes formed therein, a through-hole cover material, and a spacer; and a method for using the electrochemical element to evaluate the safety of an energy storage device by means of an internal short circuit. An energy storage device including the electrochemical element according to the present invention is characterized in that: the energy storage device can be restored, after an internal short circuit evaluation test, to a state in which a short circuit has not occurred; and a repeat test and evaluation can be carried out without disassembly and reassembly.
Claims11
An electrochemical device comprising a positive electrode, a separator and a negative electrode, which are sequentially stacked,
- wherein the separator has at least one through hole communicating between the positive electrode and the negative electrode,
- wherein at least one interface between the positive electrode and the separator or between the negative electrode and the separator includes a spacer placed at a position not overlapping with the through hole, and
- wherein the interface on which the spacer is placed includes a through-hole cover material containing a magnetic material.
A method for evaluating a safety according to an internal short circuit of a battery, comprising:
- manufacturing an electrochemical device including a positive electrode, a negative electrode, a separator having a through hole, a spacer disposed on at least one interface between the positive electrode and the separator or between the negative electrode and the separator, and a through-hole cover material covering the through hole;
- applying a magnetic field to the through-hole cover material at a position spaced apart from the electrochemical device;
- and
- exposing the through hole by removing the through-hole cover material from the through hole.
Dependencies are inferred from the claim text.