Battery cell comprising separator having magnetic body formed therein and method for evaluating battery cell safety against internal short circuit by using same
AssigneeLG Energy Solution, Ltd.
InventorsSeo Young Yoon, Tae Jong Kim
Life of this patent
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Abstract
The present invention relates to a battery cell comprising a separator in which a perforated line and magnetic bodies adjacent to the perforated line are formed, and a method for evaluating battery cell safety by using same, wherein the battery cell can induce an internal short circuit without physical deformation of the cell structure, and can be effectively applied to evaluation of battery cell safety against an internal short circuit.
Claims10
A secondary battery having a structure in which an electrode assembly including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode is housed in a battery case,
- wherein the separator includes:
- a perforated line which forms a two-dimensional closed shape on a surface of the separator;
- and
- a magnetic body formed in an area adjacent to, but spaced apart from, the perforated line, so as not to overlap the perforated line, wherein the magnetic body comprises a plurality of distinct magnetic body portions which are arranged continuously or discontinuously along the perforated line.
A method of evaluating a safety of a battery cell according to an internal short circuit, comprising:
- inducing a short circuit inside the battery cell,
- wherein the battery cell has a structure in which an electrode assembly including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode is housed in a battery case,
- wherein the separator includes:
- a perforated line which forms a two-dimensional closed shape on a surface of the separator;
- and a magnetic body which is formed in a region adjacent to, but spaced apart from, the perforated line, so as not to overlap the perforated line, wherein the magnetic body comprises a plurality of distinct magnetic body portions which are arranged continuously or discontinuously along the perforated line, and
- wherein, in the inducing the short circuit inside the battery cell, the magnet is rotated while the magnet is adjacent to or in contact with an outer peripheral surface of the battery cell, and the perforated line of the separator is partially or completely broken in response to the rotational motion of the magnet.
Dependencies are inferred from the claim text.