3results about How to "Dimensional stability" patented technology

The application discloses an ultra-thin woven pile electronic package material fabric and a preparation method thereof. The fabric is interwoven by warp yarn, weft yarn and terry yarn through satin weave, the thickness of the fabric is 0.20-0.25 mm, the fabric surface has pile formed by the terry yarn after sanding, the height of the pile is 0.05-0.10 mm, and the pile height H and the fabric thickness T satisfy H / T<=0.5. The warp yarn and the weft yarn are high-shrinkage polyester, the terry yarn is low-shrinkage polyester, and the root of the terry yarn is clamped and fixed by the warp yarn and the weft yarn in the shrinkage state. The application realizes accurate control and firm anchoring of the pile under the thickness of 0.20-0.25 mm through the cooperation of the satin weave and the high-shrinkage warp yarn and weft yarn, so that the woven pile fabric has the performances of ultra-thin, soft, size stability and non-falling of the cut edge, and the problems of the existing ultra-thin pile fabric, i.e. the pile penetrating the fabric or easily falling off, are solved.

The invention discloses a composite membrane of a special highly enhanced fluorine-containing proton or ion exchange membrane, a composite membrane electrode, a special highly enhanced fluorine-containing chlor-alkali battery membrane, a special release membrane and a preparation method thereof. The composite membrane of the special highly enhanced fluorine-containing proton or ion exchange membrane comprises at least two layers of microporous reinforced membranes, wherein both sides of each layer of microporous reinforced membranes are filled with a fluorine-containing proton or ion exchange resin, the biaxial tensile strength of the composite membrane is greater than 40MPa, the room temperature ionic conductivity is greater than 0.007S / cm, the air permeability is extremely low, and the time required for 100 ml of air to pass through the composite membrane measured by Gurley densometer is more than 5 minutes.

This invention discloses a high-expansion battery pack with an ultra-light piston structure, comprising a piston battery module, a cylinder, and a battery pack casing. The piston battery module and the cylinder are disposed inside the battery pack casing. The piston battery module includes an array of individual battery cells and a piston. A first end of the individual battery cell array is fixedly connected to the piston, and a second end of the individual battery cell array is fixedly connected to the battery pack casing. The cylinder is fixedly connected to the battery pack casing. The cylinder has a cavity for accommodating the piston. The expansion and contraction of the individual battery cell array drives the piston to reciprocate within the cavity. The cavity limits the piston, ensuring that the reciprocating motion of the piston is a linear motion along the expansion and contraction direction of the individual battery cell array. This invention achieves the technical effect of stable external dimensions during the charging and discharging process of the battery pack, effectively avoiding damage to the casing caused by the expansion and contraction of the battery module.