An electrochemical apparatus includes an electrode assembly, a first adhesive member, and a second adhesive member. The electrode assembly includes electrode plates and a separator, the electrode plates and the separator are stacked sequentially and wound to form the electrode assembly, the electrode plate includes a current collector, and the electrode assembly includes a first straight section and a first bending section. Along a winding direction, a terminating end of the separator exceeds a terminating end of the current collector by 1 to 5 turns, the first adhesive member is disposed on an outer surface of the first straight section, and the second adhesive member is disposed on an outer surface of the first bending section or an outer surface of the outermost current collector at the first bending section.

Provided is a composition for a non-aqueous secondary battery functional layer with which it is possible to form a functional layer that has excellent heat shrinkage resistance and can cause a non-aqueous secondary battery to display excellent cycle characteristics. The composition for a non-aqueous secondary battery functional layer contains organic particles and a solvent. The organic particles include a polyfunctional ethylenically unsaturated monomer unit in a proportion of not less than 55 mass % and not more than 90 mass %, and have a volume-average particle diameter of not less than 50 nm and not more than 370 nm.

Provided is a composition for a non-aqueous secondary battery functional layer with which it is possible to form a functional layer that has excellent heat shrinkage resistance and can cause a non-aqueous secondary battery to display excellent cycle characteristics. The composition for a non-aqueous secondary battery functional layer contains organic particles and a solvent. The organic particles include a polyfunctional ethylenically unsaturated monomer unit in a proportion of not less than 55 mass % and not more than 90 mass %, and have a volume-average particle diameter of not less than 50 nm and not more than 370 nm.

A one-step molded lithium ion battery separator and preparation method and application thereof are provided. The battery separator comprises a support layer and a filler layer. The support layer comprises at least two of superfine main fiber, thermoplastic bonded fiber and first nanofiber, and the filler layer comprises at least one of inorganic fillers and third nanofiber. The lithium ion battery separator has a thickness of 19-31 μm, a maximum pore diameter of no more than 1 μm, and a heat shrinkage rate of less than 3% after treatment at 300° C. for 1 hour, and the separator still has a certain strength at a high temperature, ensuring stability and isolation of the rigid structure of the filler layer at a high temperature, satisfying requirements of the separator in terms of heat resistance, pore size and strength, having excellent comprehensive performance.

A one-step molded lithium ion battery separator and preparation method and application thereof are provided. The battery separator comprises a support layer and a filler layer. The support layer comprises at least two of superfine main fiber, thermoplastic bonded fiber and first nanofiber, and the filler layer comprises at least one of inorganic fillers and third nanofiber. The lithium ion battery separator has a thickness of 19-31 μm, a maximum pore diameter of no more than 1 μm, and a heat shrinkage rate of less than 3% after treatment at 300° C. for 1 hour, and the separator still has a certain strength at a high temperature, ensuring stability and isolation of the rigid structure of the filler layer at a high temperature, satisfying requirements of the separator in terms of heat resistance, pore size and strength, having excellent comprehensive performance.

The present application relates to a separator, comprising a substrate and a coating formed on at least one surface of the substrate; wherein the coating comprises inorganic particles and organic particles, the organic particles comprise first organic particles and second organic particles; the first organic particles and the second organic particles are embedded in the inorganic particles and form protrusions on the surface of the coating; the first organic particles have a number-average particle size of >10 μm, and the second organic particles have a number-average particle size of 2 μm-10 μm. The present application also relates to a secondary battery comprising the separator, a device comprising the secondary battery and a method for preparing the separator.

The present application relates to a separator, comprising a substrate and a coating formed on at least one surface of the substrate; wherein the coating comprises inorganic particles and organic particles, the organic particles comprise first organic particles and second organic particles; the first organic particles and the second organic particles are embedded in the inorganic particles and form protrusions on the surface of the coating; the first organic particles have a number-average particle size of >10 μm, and the second organic particles have a number-average particle size of 2 μm-10 μm. The present application also relates to a secondary battery comprising the separator, a device comprising the secondary battery and a method for preparing the separator.

Disclosed herein are a multilayer separator for a lithium secondary battery capable of preventing an internal short-circuit due to growth of lithium dendrite, and a method of manufacturing the same.

A multilayer porous membrane with two exterior layers and at least one interior layer. The average pore size of the interior layer is greater than that of either of the two exterior layers. The multilayer porous membrane may be used, for example, as or as part of a battery separator. Compared to prior multilayer porous membranes for battery separators, the multilayer porous membrane herein may exhibit at least one of improved thermal properties, improved anti-metal contamination properties, improved ease of manufacture, and combinations thereof.

A multilayer porous membrane with two exterior layers and at least one interior layer. The average pore size of the interior layer is greater than that of either of the two exterior layers. The multilayer porous membrane may be used, for example, as or as part of a battery separator. Compared to prior multilayer porous membranes for battery separators, the multilayer porous membrane herein may exhibit at least one of improved thermal properties, improved anti-metal contamination properties, improved ease of manufacture, and combinations thereof.