40results about How to "Improve shutdown characteristics" patented technology

A battery separator which is a laminated polyolefin microporous membrane, comprising a polyolefin microporous membrane, and a modifying porous layer comprising a water-soluble resin or water-dispersible resin, and fine particles, the modifying porous layer being laminated on at least one surface of the polyolefin microporous membrane, wherein the polyolefin microporous membrane comprises a polyethylene resin and has (a) a shutdown temperature (a temperature at which an air resistance measured while heating the polyolefin microporous membrane at a temperature rise rate of 5°C / min reaches 1 × 10 5 sec / 100 cc) of 135°C or lower, (b) a rate of air resistance change (a gradient of a curve representing dependency of the air resistance on temperature at an air resistance of 1 × 10 4 sec / 100 cc) of 1 × 10 4 sec / 100 cc / °C or more, (c) a transverse shrinkage rate at 130°C (measured by thermomechanical analysis under a load of 2 gf at a temperature rise rate of 5°C / min) of 20% or less, and a thickness of 16 µm or less, the shutdown temperature difference between the polyolefin microporous membrane and the laminated polyolefin microporous membrane being 4.0°C or less. A method of producing the same. Provided is a battery separator with excellent adhesion and shutdown properties comprising a modifying porous layer and a polyolefin microporous membrane.

The polyethylene multilayer microporous film of the present invention has: (a) a first porous layer made of polyethylene resin; (b) a second porous layer containing polyethylene resin and melting point or glass A heat-resistant resin having a transformation temperature of 170° C. or higher, and the heat-resistant resin is dispersed in the form of fine particles in the polyethylene-based resin, and fibrils composed of the polyethylene-based resin have the heat-resistant The fine particles of the permanent resin are fine pores with core cracks, and the polyethylene multilayer microporous membrane has shut-off properties, ablation properties, permeability, mechanical strength, heat shrinkage resistance, and compression resistance in an excellent harmony.

A closing hinge for the pivotable articulation of a first part, in particular a door leaf, on a second part, in particular a door frame, includes a center longitudinal axis, a rotating receiver unit that can be rotated about the center longitudinal axis for fastening to the first part, which can be rotated, in particular, about the center longitudinal axis, and a freely rotating closing unit, which is connected to the rotating receiver unit in a torque-transmitting manner, for fastening to the second part, which is fixed, in particular, with respect to the center longitudinal axis, the closing hinge being displaceable between a closing arrangement and a freely rotating arrangement, the rotating receiver unit being freely rotatable, in particular in a torque-free manner, about the center longitudinal axis relative to the freely rotating closing unit in the closing arrangement.

A laminated polyolefin microporous membrane is disclosed. The laminated polyolefin microporous membrane includes a first polyolefin microporous membrane, and a second polyolefin microporous membrane. A shutdown temperature of the laminated polyolefin microporous membrane is from 128° C. to 135° C., an air permeation resistance increase rate from 30° C. to 105° C. per 20 μm of thickness of the laminated polyolefin microporous membrane is less than 1.5 sec / 100 cc Air / ° C., and a variation range in an F25 value of the laminated polyolefin microporous membrane in a longitudinal direction is not greater than 1 MPa. The F25 value represents a value determined by dividing the load at 25% elongation of a sample of the laminated polyolefin microporous membrane as measured with a tensile tester by the cross-sectional area of the sample polyolefin microporous membrane.

The invention discloses a polyethylene composition for manufacturing a lithium battery diaphragm. The composition is prepared by blending a polyethylene material and a diluent. Polyethylene resins of different molecular weights are taken as polyethylene materials for manufacturing a lithium battery diaphragm, and are uniformly mixed and blended with a diluent to form a polyethylene composition, so that the lithium battery diaphragm is prepared. The polyethylene material used in the invention is an ordinary super-high-molecular-weight polyethylene resin, a super-high-molecular-weight polyethylene resin or a high-density polyethylene resin. The battery diaphragm prepared from the polyethylene composition has low requirement on the accuracy of manufacturing equipment and high production efficiency, has high tearing strength, high piercing resistance and smaller thickness while keeping the high porosity, high insulating property and high shutoff property of an ordinary polyethylene lithium battery, and is suitable for manufacturing a smaller lithium battery.

The present invention provides a polyolefin microporous membrane having a small pore size, excellent shutdown characteristics, and suitable for a separator for a non-aqueous electrolyte secondary battery. The invention provides a polyolefin microporous membrane, which is characterized in that the difference between the shutdown initiation temperature in the MD direction and the maximum shrinkage temperature in the MD direction is above 8.6°C, and the maximum pore diameter is less than 0.036 μm. In addition, the present invention also provides a method for producing a polyolefin microporous membrane, which is characterized in that polyolefin resin containing ultra-high molecular weight polyolefin and a plasticizer are melt-kneaded, formed into a sheet, and the obtained sheet is After stretching in the MD direction and simultaneous biaxial stretching, the stretched sheet is dried.

The present invention provides, as a porous layer that can be used for a member for a nonaqueous secondary battery having excellent shutdown characteristics, a porous layer including a polyvinylidene fluoride-based resin, wherein, assuming that a sum of individual amounts of crystal form α and crystal form β contained in the polyvinylidene fluoride-based resin is 100 mol %, the amount of crystal form α contained in the polyvinylidene fluoride-based resin is not less than 10 mol % and not more than 65 mol %.

The invention relates to an IGBT with a terminal deep-level impurity layer, which belongs to the technical field of semiconductor power devices. Based on the traditional Planar FS-IGBT, the invention injects a deep energy level impurity layer (15) into the terminal drift region (14). In the deep-level impurity layer (15), as the temperature of the device increases, the ionization degree of the deep-level impurities increases, and the impurity concentration increases significantly. When the IGBT is turned off, the increased carrier concentration in the terminal drift region is effectively reduced. The hole emission efficiency of the P+ collector region in the small terminal region reduces the parasitic PNP transistor αPNP, thereby effectively reducing the high-temperature leakage current of the device; the increased electron concentration in the drift region and the accelerated recombination of holes injected into the P+ collector region, and deep energy The level impurity itself is a recombination center, further accelerating the recombination of electrons and holes, effectively improving the turn-off characteristics and improving the reliability of the IGBT.