5results about How to "Prevent internal short circuit" patented technology

Electrode assembly and secondary battery including the same. The present invention relates to an electrode assembly in which a first electrode, a separator, and a second electrode are stacked and wound, the first electrode including a current collector and an electrode active material layer provided on the current collector, an edge portion of the current collector provided on a side of an end portion of a winding axis of the electrode assembly including a coating-free portion having no electrode active material layer, and the coating-free portion of the first electrode being bent one or more times in a direction from a winding center of the electrode assembly to an outer contour of the electrode assembly.

The invention relates to a sulfonyl-containing gel polymer electrolyte and a preparation method and application thereof, a sulfonyl-containing compound is used as a polymerizable monomer, an electrolyte precursor solution is prepared, and the sulfonyl-containing gel polymer electrolyte is formed after polymerization; the gel polymer electrolyte can be used for a lithium ion battery, a lithium metal battery or a lithium secondary battery, is particularly suitable for a high-nickel lithium battery, and can improve the cycling stability and safety of the lithium battery under high voltage; the sulfonyl-containing polymerizable monomer is simple in synthesis process, low in cost and relatively high in yield; and the method is highly matched with the preparation process of the current battery and is very suitable for large-scale production.

The present invention relates to an electrode assembly and a secondary battery. The electrode assembly includes a first electrode, a separator, and a second electrode stacked and wound around a winding axis. The first electrode has a first surface facing the winding axis and a second surface opposite the first surface. In an inner core portion of the electrode assembly or a portion thereof, a flat portion ratio is greater than 3% and less than or equal to 13.5%, the flat portion ratio being a ratio of a region of the first electrode in which a curvature is less than or equal to 1. The core portion is a portion of a region of the electrode assembly within 3 windings from an inner end portion of the first electrode. The design of this electrode assembly can solve core deformation.

This invention relates to the field of battery technology, specifically to a composite separator and a lithium-ion battery. The composite separator comprises a porous polymer layer; a heat-resistant polymer layer disposed on the surface of the porous polymer layer; and an interfacial bonding layer disposed between the porous polymer layer and the heat-resistant polymer layer. The composite separator has an air permeability of 80s / 100mL to 350s / 100mL, a puncture strength ≥350gf, and a tensile strength ≥1400kgf / cm². 2 Compared with the prior art, the present invention utilizes an interfacial bonding layer to tightly bond the porous polymer layer and the heat-resistant polymer layer, so that the composite membrane can maintain dimensional stability at high temperatures and prevent electrode short circuits by relying on the skeleton support of the heat-resistant polymer layer, while maintaining an effective lithium-ion transport channel, thereby taking into account a safe membrane breakage temperature, low thermal shrinkage rate and high ionic conductivity.

This invention provides a single-cell battery and a battery pack. The single-cell battery includes a housing, a motor assembly, and an insulating component. The housing includes an end wall with a pressure-sensitive weak point. An electrode assembly is sealed and housed within the housing. The insulating component is fixedly connected to the side of the end wall facing the electrode assembly to achieve insulation between the end wall and the electrode assembly. The insulating component includes a first insulating portion and a second insulating portion. The melting point of the first insulating portion is lower than that of the second insulating portion. The orthographic projection of the first insulating portion at least partially covers the pressure-sensitive weak point. The first insulating portion is configured to melt due to high temperature when the pressure-sensitive weak point ruptures, allowing it to be ejected from the rupture point to the outside of the housing under the internal pressure. The second insulating portion is configured not to melt when the pressure-sensitive weak point ruptures, maintaining a fixed connection with the end wall. This invention improves the problem that when the pressure-sensitive weak point ruptures and releases pressure, the insulating component easily obstructs the exhaust channel, affecting normal pressure release.