Separator and electrochemical device

摘要

The present disclosure provides a separator and an electrochemical device, the separator is provided with a folded structure unit across a widthwise direction of the separator, and an overlapping part of the folded structure unit is filled with an adhesive. When the separator is applied into a production of the electrochemical device, a winding process can be performed as usual. After an electrolyte injection or high temperature aging of the electrochemical device, the adhesive filled in the folded structure unit of the separator may be dissolved into the electrolyte, the folded structure unit can be unfolded to a flat position again, so as to effectively eliminate deformation of the electrochemical device, which may be caused by thermal contraction of the separator, over stress in the separator wound in a cell, or the separator's binding on expansion of negative and positive electrodes, during operation and production of the electrochemical device.

主权项

1. A separator comprising a folded structure unit across a widthwise direction (W) of the separator, an overlapping part of the folded structure unit being filled with an adhesive, wherein the folded structure unit is positioned between two opposite ends of the separator and the two opposite ends of the separator are in a lengthwise direction of the separator, wherein after the adhesive filled in the overlapping part of the folded structure unit is cured, a bearable tensile force of the folded structure unit along a lengthwise direction (L) of the separator is 1.0˜10.0 N/mm2.