4results about How to "Prevent self-discharge" patented technology

The application relates to a diaphragm and an electrochemical device and an electronic device comprising the same, and belongs to the technical field of electrochemical energy storage. The diaphragm comprises a porous substrate and a porous coating on at least one side surface of the porous substrate, and the porous coating comprises fibrous fillers; the fibrous fillers comprise a core layer and a shell layer on the surface of the core layer, the core layer comprises at least one of Mxene and an oxide thereof, MOFs and an oxide thereof, black phosphorus and an oxide thereof, and carbon; the shell layer comprises at least one of silicon dioxide and a lithiumophilic metal oxide; the mass ratio of the shell layer to the core layer of the fibrous fillers is M; the thermal conductivity of the diaphragm is lambda W / (m.K), the specific heat capacity is Cp J / (g.K), and the density is rho g / cm 3 ; the following relationships are satisfied: 0.010 <= (M*lambda) / (2Cp) <= 0.017 and 0.4 <= lambda / (rho*Cp) <= 1.0. The diaphragm can improve the safety performance, cycle life and rate performance of a battery.

The utility model discloses a bipolar current collector, a bipolar electrode and a battery, the bipolar current collector comprises a polymer film-based material belt, and the polymer film-based material belt is provided with a positive active region and a negative active region which are arranged in a row; wherein the positive active regions and the negative active regions are alternately arranged at intervals; a blank base film region is arranged between the adjacent positive active region and negative active region; the end part of the positive active region is a positive tab region, and the end part of the negative active region is a negative tab region. According to the utility model, the production process can be simplified, the production efficiency can be improved, metal burrs can be reduced, the battery self-discharge and short circuit phenomena caused by the metal burrs can be avoided, and the safety advantage can be realized.