Abstract: A separator includes a base film and an organic coating disposed on one surface of the base film. The organic coating contains a first polymer and a second polymer. A melting point T of the first polymer satisfies 60° C.?T?100° C., and a swelling degree D of the second polymer during placement in an electrolyte solution at 60° C. for 24 h satisfies D?30%.

Abstract: A battery includes an electrode assembly and a packaging bag. The electrode assembly includes an electrode plate and a separator. The separator includes a porous substrate. A first coating layer is disposed on at least one surface of the porous substrate. The first coating layer includes a first polymer and a second polymer that melt at different melting points. The battery satisfies: 0.077?(3.0?D2/D1)/T?0.118, thereby endowing the battery with superior electrochemical performance, a relatively wide hot-oven window, and a relatively high hot-oven test pass rate.

Abstract: A separator includes a substrate layer, an inorganic coating, and a bonding layer, where the inorganic coating is disposed between the substrate layer and the bonding layer, and the bonding layer contains a plurality of bonded particles, a surface of each bonded particle containing a plurality of protrusions, an average diameter of the protrusions ranges from 20 nm to 100 nm. The separator provided by this application is conducive to improving the cycle performance, low-temperature performance and rate performance of the electrochemical apparatus.

Abstract: A separator includes a substrate layer, an inorganic coating and a bonding layer. The inorganic coating is disposed between the substrate layer and the bonding layer and includes inorganic particles, the bonding layer includes polymer particles, and at least part of the polymer particles are embedded in pores of the inorganic coating; and in a scanning electron microscope image of a cross section of the separator at a magnification of 2000, within an area of 11.6 ?m×7.6 ?m, the number of polymer particles embedded in the inorganic coating at a depth greater than or equal to 100 nm is C, and the total number of polymer particles in the cross section is D, where 0.5?C/D<0.94.

Abstract: An electrochemical apparatus includes a positive electrode plate, a negative electrode plate, a separator, and an electrolyte. The separator is disposed between the positive electrode plate and the negative electrode plate, the separator includes a porous substrate, and the porous substrate includes a first polyethylene resin material and a second polyethylene resin material; where a melting enthalpy of the first polyethylene resin material is 110 J/g to 160 J/g, a melting enthalpy of the second polyethylene resin material is 170 J/g to 205 J/g, and a shutdown rate of the separator is 10 k?/min to 80 k?/min; based on the mass of the porous substrate, a mass percentage of the first polyethylene resin material is 10% to 40%, and a mass percentage of the second polyethylene resin material is 45% to 88%.

Abstract: A separator includes a separator substrate, a first coating layer, and a second coating layer. The separator substrate includes a first surface and a second surface disposed opposite to each other. The first surface faces a positive electrode, and the second surface faces a negative electrode. The first coating layer is disposed on the first surface, and the second coating layer is disposed on the second surface. The first coating layer is a dense solid filler coating. A porosity of the first coating layer is denoted as D1, satisfying: 10%?D1<30%. The second coating layer is a high-porosity solid filler coating. A porosity of the second coating layer is denoted as D2, satisfying: 30%?D2?60%.

Abstract: A separator includes a base film and a first coating disposed on a surface of the base film to face one side of a positive electrode. The first coating includes an organic cyanide with a first functional group. The first functional group includes at least one of a cyano group, an isocyano group, an isocyanate group, or a melamine compound. The first functional group of the first coating has a molar concentration of M fmol/?m3, where 0.1?M?30. The secondary battery provided by this application has a high energy density and also has good thermal safety, high-temperature cycle performance and high-temperature storage performance.

Abstract: A secondary battery includes a positive electrode plate, a negative electrode plate, and a separator, the separator is provided with a first organic coating on a surface facing the positive electrode plate, and the separator is provided with a second organic coating on a surface facing the negative electrode plate, where the first organic coating includes a polymer, and a melting point of the polymer is in a range of 60° C. to 100° C. The secondary battery provided by this application satisfies the above characteristics, widening a hot-box window and enhancing safety performance without affecting cycling performance of the secondary battery.

Abstract: A separator includes a substrate, an inorganic coating layer, and an adhesive layer, where the inorganic coating layer and the adhesive layer are disposed on a first surface of the substrate. The inorganic coating layer is disposed between the substrate and the adhesive layer. The adhesive layer is disposed on a second surface of the substrate. The inorganic coating layer includes filler particles. The adhesive layer includes polymer particles. The separator includes a first surface provided with the inorganic coating layer and the adhesive layer. In a region with an area of 100 ?m2 on the first surface, a quantity of the polymer particles is A, where 10?A?100. An average particle size of the filler particles is Dv50?1 ?m, and an average particle size of the polymer particles is Dv50?2 ?M, WHERE Dv50?1 AND Dv50?2 SATISFY 0.2?Dv50?1/Dv50?2?2.5 AND 0.2?Dv50?1?1.

Abstract: A separator includes a porous substrate, and a porous layer arranged on a surface of the porous substrate. The porous layer comprises inorganic particles and a binder, and a ratio of Dv90 of the inorganic particles to the thickness of the porous layer is in a range from 0.3 to 3.0. Excellent adhesion exists between the separator and the electrode according to the present application, which ensures that the energy storage device has good safety performance. Moreover, the rate performance and cycle performance of the energy storage device can be greatly improved due to the existence of inorganic particles in the separator.

Abstract: An energy storage device includes a separator, the separator includes a porous substrate, and a porous layer arranged on a surface of the porous substrate. The porous layer includes inorganic particles and a binder, and a ratio of Dv90 of the inorganic particles to the thickness of the porous layer is in a range from 0.3 to 3.0. Excellent adhesion exists between the separator and the electrode, which ensures that the energy storage device has good safety performance. Moreover, the rate performance and cycle performance of the energy storage device can be greatly improved due to the existence of inorganic particles in the separator.

Abstract: An energy storage device includes a separator, the separator includes a porous substrate, and a porous layer arranged on a surface of the porous substrate. The porous layer comprises inorganic particles and a binder, and a ratio of Dv90 of the inorganic particles to the thickness of the porous layer is in a range from 0.3 to 3.0. Excellent adhesion exists between the separator and the electrode according to the present application, which ensures that the energy storage device has good safety performance. Moreover, the rate performance and cycle performance of the energy storage device can be greatly improved due to the existence of inorganic particles in the separator.

Abstract: An electrochemical apparatus includes an electrolyte, a positive electrode plate, a negative electrode plate, and a separator, where the separator is disposed between the positive electrode plate and the negative electrode plate; a width W of the electrochemical apparatus and a thickness T of the electrochemical apparatus satisfy: 80 mm?W?120 mm, and 2.3?W/T?4; and an adhesion force F between the separator and the positive electrode plate is 5 N/m to 15 N/m. With the adhesion force of the separator being regulated within the foregoing ranges, the separator has high adhesive performance. The application of the separator to a wide and thin electrochemical apparatus with a width and W/T value within the foregoing ranges can mitigate the deformation problem of the wide and thin electrochemical apparatus during cycling while taking the rate performance of the wide and thin electrochemical apparatus into account.

Abstract: An electrochemical apparatus includes an electrolyte, a positive electrode plate, a negative electrode plate, and a separator. The separator is disposed between the positive electrode plate and the negative electrode plate. The separator includes a substrate and a first coating provided on both surfaces of the substrate. The first coating includes polymer particles. In an 11.5 ?m×7.5 ?m region of a surface of the first coating, a quantity Q of the polymer particles is 10 to 90. The electrolyte includes substituted or unsubstituted C3-C8 linear carboxylate, and in a case of substitution, a substituent group is selected from halogen atoms. A mass percentage B of the linear carboxylate is 5% to 50% based on a mass of the electrolyte.

Abstract: A secondary battery includes a positive electrode plate, a negative electrode plate, an electrolyte, and a separator. The separator includes a base film, where a pore size distribution of the base film is a bimodal distribution. A pore size on a side of the base film facing the negative electrode plate is larger than a pore size on a side of the base film facing the positive electrode plate. The pore size on the side of the base film facing the negative electrode plate is 60 nm to 500 nm, and the pore size on the side of the base film facing the positive electrode plate is 5 nm to 55 nm. This can improve the fast charging performance of the secondary battery and alleviate lithium precipitation.

Abstract: A separator includes a porous substrate and a porous coating. The porous coating is disposed on at least one surface of the porous substrate. The porous coating includes inorganic particles and a binder. The binder includes a first binder. The first binder includes a metal element. The separator of this application is excellent in thermal safety stability and mechanical stability, mainly manifested in that, when a rupture hole is generated on the separator by thermally puncturing the separator by using a round needle with a diameter of R heated to 500° C., a maximum value of a distance between any two points on an edge of the rupture hole is r in a case that the two points are connected to form a line and the distance between the two points is calculated, satisfying: 400 ?m?R?1000 ?m, and 0.9?r/R?5.

Abstract: A separator includes a porous substrate and a porous coating. The porous coating is disposed on at least one surface of the porous substrate. The porous coating includes inorganic particles and a binder. The separator of this application exhibits excellent thermal safety stability and mechanical stability, mainly manifested in that the Modulus of the separator at temperature T is P, satisfying: 100° C.?T?180° C., and 108 Pa?P?109 Pa.

Abstract: A secondary battery, including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode. The positive electrode, the separator, and the negative electrode are sequentially stacked and wound to form a winding structure including a bent portion and a straight portion. The separator includes a substrate, wherein the substrate has a first surface and a second surface opposite to the first surface. A first coating is disposed on the first surface of the substrate, and a second coating is disposed on the second surface of the substrate, wherein, in the bent portion of the winding structure, a first distance between adjacent positive and negative electrodes is d1, and in the straight portion of the winding structure, a second distance between the adjacent positive and negative electrodes is d2, wherein 1<d1/d2<10, and d1 and d2 are measured in a same unit.

Abstract: A separator includes a porous substrate and a porous coating disposed on at least one surface of the porous substrate, where the porous coating includes a polymer and a thickness covariance value of the separator is 0.01 to 0.02. The separator provided has good thickness consistency, which is conducive to improving the packaging performance of the electrochemical device, and the resulting electronic device has a longer service life and good usage performance.

Abstract: A separator includes a porous substrate and a porous coating disposed on at least one surface of the porous substrate, the porous coating includes a polymer, and the polymer includes polymer particles. In a 130 ?m×100 ?m region on a surface of the porous coating, the number of the polymer particles with a maximum diameter in a range of 5 ?m to 14 ?m is 100 to 180. The separator has large-particle size polymer that can increase the interface gap at the corners of the electrochemical device. Thus, for the electrochemical device, the electrolyte at the corner interfaces can achieve good infiltration during the charge-discharge cycling process, effectively alleviating the corner purple/black spot problem of the electrochemical device.