Electric storage device, and vehicle mounted electric storage system

摘要

Provided is an electric storage device provided with: a positive electrode including a positive electrode substrate and a positive electrode mixture layer, the positive electrode mixture layer being formed on the positive electrode substrate and containing a positive electrode active material; a negative electrode including a negative electrode substrate and a negative electrode mixture layer, the negative electrode mixture layer being formed on the negative electrode substrate and containing a negative electrode active material; and a separator disposed between the positive electrode and the negative electrode. In the electric storage device, the separator yields a triple value of standard deviation of local air resistance, as measured within a 5-mm diameter circle, of at least 20 seconds/10 cc but not more than 350 seconds/10 cc.

主权项

1. An electric storage device comprising:
a positive electrode including a positive electrode substrate and a positive electrode mixture layer, the positive electrode mixture layer being formed on the positive electrode substrate and containing a positive electrode active material; a negative electrode including a negative electrode substrate and a negative electrode mixture layer, the negative electrode mixture layer being formed on the negative electrode substrate and containing a negative electrode active material; and a separator disposed between the positive electrode and the negative electrode, wherein the separator yields a triple value of standard deviation of local air resistance of at least 20 seconds/10 cc but not more than 350 seconds/10 cc, the triple value of standard deviation of the local air resistance being calculated from measured values of a time period required for a 10 cc air to pass through an air orifice having a diameter of 5 mm at 16 sampling points in accordance with JIS P8117 with a Gurley-type densometer, the sampling points spaced at 15 mm or more from one another in a MD direction in which a raw material of the separator is conveyed to be formed into a sheet, the sampling points further being equally spaced 4 points in a TD direction perpendicular to the MD direction along a surface of the sheet wherein an air resistance is the time required for a gas with specific volume to permeate an object measured in units second/cc.