A secondary battery includes: an electrode assembly including a first electrode plate, a second electrode plate, and a separator between the first electrode plate and the second electrode plate; a case accommodating the electrode assembly; and a shock absorbing portion on at least one side of the electrode assembly to absorb shock. According to embodiments of the present disclosure, a bonding force between separators is strengthened by the shock absorbing portion, and, thus, the separators are not separated even by an external shock. In addition, even if the alignment of electrode plates is poor during heat treatment of side surfaces of the electrode assembly, an amount of shrinkage of the separators can be constantly adjusted.

A manufacturing method includes a cleaning step of irradiating by laser light a joining site of a first separator to which a second separator is to be joined, without joining the first separator and the second separator. In the cleaning step, at least a part of a joining site is irradiated by the laser light such that a plurality of irradiation marks created by the laser light make up a separated irradiation mark pattern in which the irradiation marks are disposed separated from each other.

An electrode assembly includes a plurality of electrodes and a connection component. The electrodes are arranged in a stack along a stacking dimension with a respective separator portion positioned between each of the electrodes. Each of the electrodes has an outer perimeter within a plane extending transverse to the stacking dimension, and the separator portions each have a respective overhanging portion protruding outwardly in a lateral dimension beyond the outer perimeters of adjacent ones of the electrodes, where the lateral dimension is oriented transverse to the stacking dimension. The connection component extends between and connects at least two adjacent overhanging portions of the separator portions. The connection component comprises a network of strands of material, a plurality of which cross over other strands so as to define respective crossing locations. A region of the connection component includes multiple crossing locations spaced apart from one another in the stacking dimension.

An electrochemical cell includes a positive electrode including a first current collector, one or more first tabs, and a first active material. A negative electrode includes a second current collector, one or more second tabs, and a second active material. A separator is disposed between the positive electrode and the negative electrode. A resistive coating is configured to at least partially coat one or both of the first current collector, the second current collector, the one or more first tabs, and the one or more second tabs.

A separator which includes: a porous polymer substrate having a plurality of pores; a separator base including a porous coating layer formed on at least one surface of the porous polymer substrate; and an adhesive layer formed on at least one surface of the separator base, said adhesive layer comprising a plurality of second inorganic particles and adhesive resin particles, wherein the weight ratio of the second inorganic particles to the adhesive resin particles is 5:95-60:40, and the diameter of the adhesive resin particles is 1.1-3.5 times the diameter of the second inorganic particles. An electrochemical device including the separator is also disclosed. The separator shows improved adhesion between an electrode and the separator, maintains the pores of the adhesive layer even after a process of electrode lamination, and improves the resistance of an electrochemical device.

A battery component is described that has at least one ceramic layer that includes ceramic particles and a binder. The ceramic particles may include α-alumina or γ-alumina. The ceramic layer may be characterized by a porosity of greater than or about 40 vol %. In additional embodiments, the one or more ceramic layers may have a weight ratio of ceramic particles to binder is greater than or about 90:10. The battery component may be a battery separator that is characterized by a MacMullin number of less than or about 40 and a thermal shrinkage of less than or about 1 vol. % after 1 hour at 140° C.

The present invention relates to a composite separator for a lithium secondary battery, and an aqueous manufacturing method therefor, the composite separator comprising: a porous polymer substrate; a heat-resistant coating layer containing inorganic material formed on the surface of the porous polymer substrate; and a composite binder in which an organic-inorganic composite sol and an organic polymer are mixed, or an modified organic polymer binder, which bonds the porous polymer substrate and the heat-resistant coating layer, and a nonionic surfactant. Composite separators disclosed. in the present invention exhibits high air permeability, low thermal shrinkage, and excellent electrochemical characteristics.

An electrochemical apparatus includes an electrode assembly, a packaging bag and a first connecting layer. The electrode assembly includes an adhesive layer. An outermost current collector of the electrode assembly includes a first bending portion, a second bending portion opposite to the first bending portion and a flat portion connected between the first bending portion and the second bending portion. The adhesive layer is pasted to a surface of the flat portion facing toward a winding center of the electrode assembly. The packaging, bag is configured to accommodate at least a part of the electrode assembly. The first connecting layer is pasted to the first bending portion and to a part of an outer surface of the flat portion. A projection of the second connecting, layer and a projection of the adhesive layer in a direction perpendicular to an outer surface of the flat portion have an overlapping zone.

The present disclosure provides a battery cell structure of a button battery and a manufacturing method thereof, and a button battery, where the battery cell structure of the button battery includes a winding core which is formed by winding a laminated structure and is provided with a hollow inner hole, the laminated structure includes at least one positive electrode sheet, at least one negative plate, and a separator which separates the at least one positive electrode sheet from the at least one negative electrode sheet, at least two ends of the winding core are provided with a separator bonding layer wrapping the winding core, and the separator bonding layer is used for fixing the positive electrode sheet and the negative electrode sheet.

A lithium battery includes a wound core and tabs, in which the wound core is formed by stacking and winding an inner separator, a first electrode sheet, an outer separator, and a second electrode sheet, and the first electrode sheet and the second electrode sheet have opposite polarity; each of the inner separator and the outer separator has a clamping section, a first straight section and a tail laminating section; where, the first straight section is located in front of the first electrode sheet, the tail laminating section is a separator end, and the clamping section, the first straight section and the tail laminating section of the inner separator are respectively laminated with the clamping section, the first straight section and the tail laminating section of the outer separator; and the first straight section of the inner separator has a surface friction coefficient of 0.1-0.4.