BAG-SHAPED SEPARATOR FOR ELECTRIC STORAGE DEVICE, THERMAL BONDING METHOD AND THERMAL BONDING DEVICE THEREFOR, AND ELECTRIC STORAGE DEVICE
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United States of America Patent
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Issued Date -
Mar 25, 2021
app pub date -
May 29, 2018
filing date -
Jul 14, 2017
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Abstract
The present invention provides a bag-shaped separator made of a separator material containing a material having the softening or melting point with a thermally bonded portion less susceptible to breakage, a thermal bonding method and a thermal bonding device therefor, and an electric storage device. The bag-shaped separator is formed with two sheets of a separator material with piled or a one sheet of the separator material with folded and piled. The separator material includes a polymer material having a melting or softening point and has one or more thermal bonding regions 30 at the edge of piled separator materials. The thermal bonding region 30 includes a fused region 31 where the separator material solidifies again after melting or softening, and a region 32 where the fusion rate of the polymer material decreases continuously from the fused region 31 toward a region 34 adjacent to the thermal bonding region 30.
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