5results about How to "Increase infiltration speed" patented technology

The application discloses a kind of marine carbon fiber warp knits and its preparation method application, carbon fiber reinforced resin composite material, belong to carbon fiber composite material technical field, solve the problem of existing technology in the forming of ship large curved surface workpiece Fabric is easy to shrink, resin infiltration efficiency is low.The marine carbon fiber warp knits includes at least two carbon fiber yarn sheets, the carbon fiber yarn sheet is formed by carbon fiber yarn spread yarn flat cross section;At least two carbon fiber yarn sheets are stacked along the thickness direction, and the lay angle of adjacent carbon fiber yarn sheet constitutes asymmetric lay structure;The carbon fiber yarn sheet is stitched by warp knitting thread, and the stitching density of the warp knitting thread is 8-14 roots / inch.The marine carbon fiber warp knits can realize width variation <5mm, resin rapid and uniform infiltration, improve the forming quality and efficiency of ship large curved surface workpiece.

The utility model relates to the technical field of batteries, and discloses a cylindrical lithium ion battery collector plate which comprises a main body mechanism, the main body mechanism comprises a battery collector plate body, and a collector plate shell welding area is fixedly arranged in the middle of the upper end of the battery collector plate body. A collector plate limiting ring area is fixedly arranged at the outer end of the upper end of the battery collector plate body, the collector plate limiting ring area is located on the outer side of the collector plate shell welding area, and a collector plate tab welding area is fixedly arranged at the upper end of the battery collector plate body. According to the cylindrical lithium ion battery collector plate, the collector plate shell welding area is in a boss design, close contact with the shell is facilitated, contact internal resistance and gaps are reduced, the collector plate shell welding area is in a boss embossing design, close contact with the shell is further facilitated, the contact internal resistance and gaps are reduced, and the welding stability is improved; and the liquid guide groove hole area of the collector plate is hollowed out, so that the electrolyte injection efficiency is improved, and the electrolyte infiltration speed is increased.

The application discloses a pole piece, an electrochemical device and an electronic device. The pole piece comprises a current collector and an active material layer. The active material layer is arranged on one surface of the current collector. The active material layer is provided with a first groove, a second groove and a third groove. The first groove extends along the length direction of the current collector. One end of the second groove is communicated with the first groove. The other end of the second groove is extended and arranged. A first included angle is formed between the extension direction of the second groove and the extension direction of the first groove. One end of the third groove is communicated with the second groove. The other end of the third groove is extended and arranged. A second included angle is formed between the extension direction of the third groove and the extension direction of the second groove. The pole piece aims to improve the transverse infiltration speed of the electrolyte in the battery and improve local lithium precipitation.

This application provides a positive electrode additive and its preparation method, a positive electrode sheet, a secondary battery, and a battery pack, wherein the positive electrode additive includes a fluorohydrazone compound represented by Formula I or Formula II. In Formula I, R1, R2, and R3 are each independently selected from -H or -F, and R1, R2, and R3 are not simultaneously -H; R4 is selected from substituted or unsubstituted alkyl, halogen, or nitro groups. In Formula II, R5, R6, and R7 are each independently selected from -H or -F, and R5, R6, and R7 are not simultaneously -H; R8 is selected from substituted or unsubstituted alkyl, halogen, or nitro groups.

This application discloses a dispersant for lithium-ion battery negative electrode slurry and its application. The dispersant comprises water and an active ingredient, with the mass ratio of the active ingredient to water being 1:(0.7-6). The active ingredient comprises a first component, a second component, and a third component, with the mass ratio of the first, second, and third components being (0.1-4):(0.1-3):(0.1-4). The first component is polystyrene sulfonic acid or lithium polystyrene sulfonate; the second component is a comb-type copolymer polycarboxylic acid or a comb-type copolymer lithium carboxylic acid; and the third component is an acrylic acid-maleic anhydride copolymer or an acrylic acid-maleic anhydride copolymer lithium salt. The dispersant for lithium-ion battery negative electrode slurry provided in this application can solve the problem of difficult dispersion of carbon black and graphite in slurry.