Abstract: The present application provides a separator and a lithium ion battery, the separator comprises a first porous substrate, a second porous substrate and a third porous substrate, wherein the second porous substrate is arranged between the first porous substrate and the third porous substrate, and a tensile strength of the separator in amachine direction is greater than a tensile strength of the separator in a transverse direction. The use of the separator of the present application can improve the thermal stability and safety performance of the lithium ion battery.

Abstract: Embodiments of the present application disclose a battery to reduce the volume of the battery, improve the energy density of the battery, and further improve the bottom molding effect of the battery, as well as the safety performance and service life of the battery. The battery comprises an electrode assembly and a package film for packaging the electrode assembly, the package film including a folding portion, the folding portion including a first segment attached to the end face of the electrode assembly and a second segment connected to the first segment. The first segment is arranged between the second segment and the electrode assembly, and the second segment includes a multilayer package films.

Abstract: A secondary battery is provided, comprising a first adapter piece and an electrode assembly, comprising a first and second electrode plates, a plurality of first electrode tabs, a second electrode tab, a direction parallel to the first electrode plate being L, two end points in a thickness direction being T1 and T3, a position of one of the first electrode tabs farthest from T1 or T3 is T2; all the first electrode tabs are stacked to form a first multi-tab structure and connected to the first adapter piece, it further comprises a first adapter member comprising the first multi-tab structure and the first adapter piece; in the L direction, there is at most one layer of the first adapter member. The present application may reduce the existing waste of the top space caused by bending electrode tabs, and is more stable for the bending effect, improving the ED of battery.

Abstract: The present application provides an electrode tab structure and a battery, the electrode tab structure includes: an electrode tab substrate; a current collector connected with the electrode tab substrate, a largest thickness after the electrode tab substrate being welded with the current collector is less than or equal to 1.5 times of a sum of a thickness of the electrode tab substrate and a thickness of the current collector. In the present application, the thickness of the electrode tab structure is suitably limited with respect to the sum of the thickness of the electrode tab substrate and the current collector, which avoids defect of too large welding resistance caused by too large thickness of the electrode tab structure, so as to improve internal symmetry of the cell, increase the reliability of the electrode tab structure, and avoid from deforming, which thereby improving the overall performance of the battery.

Abstract: The present application provides a positive active material, a positive electrode and a lithium-ion battery. The positive active material comprising a first particle and a second particle, wherein the first particle has a chemical formula of LieCogM1-gO2-i, and the second particle has a chemical formula of LifCohN1-hO2-j, the element M is at least two selected from a group consisting of Ni, Mn, Al, Mg, Ti, La, Y and Zr, the element N is at least one selected from a group consisting of Ni, Mn, Al, Mg, Ti, La, Y and Zr, and 0.8?e?1.2, 0<g<1, ?0.1?i?0.2, 0.8?f?1.2, 0<h<1, ?0.1?j?0.2, the number of types of the element M in the first particle is greater than the number of types of the element N in the second particles. The positive active material of the present application has a good stability and can improve the capacity retention rate of the lithium-ion battery.

Abstract: A secondary battery comprises a cell. The cell includes a positive electrode plate having a positive current collector and a negative electrode plate having a negative current collector. The secondary battery further includes: a first positive electrode tab and a second positive electrode tab, one end of the first positive electrode tab is fixed on and electrically connects with the positive current collector, the other end of the first positive electrode tab extends to the outside of the cell; and/or, a first negative electrode tab and a second negative electrode tab, one end of the first negative electrode tab is fixed on and electrically connects with the negative current collector, the other end of the first negative electrode tab extends to the outside of the cell, one end of the second negative electrode tab is fixed on and electrically connects with the other end of the first negative electrode tab.

Abstract: The present application provides a lithium ion battery and a negative electrode thereof. The negative electrode comprises: a negative electrode active material layer and an additive comprising a metal sulfide, wherein the additive is distributed in the negative electrode active material layer, distributed on the surface of the negative electrode active material layer, or both in the negative electrode active material layer and on the surface of the negative electrode active material layer. The negative electrode of the present application may effectively improve the performance of the lithium ion battery, and greatly improve the capacity and cycle performance of the lithium ion battery.

Abstract: The present disclosure provides a wound-type cell which includes: a first electrode plate; a second electrode plate; a separator disposed between the first electrode plate and the second electrode plate; a first electrode tab electrically connected to the first electrode plate; and a second electrode tab electrically connected to the second electrode plate; in which a third winding start end of the separator is positioned at an outer side of a second winding start end of the second electrode plate in a length direction; the third winding start end extends along a direction away from a second end of the second winding start end and the third winding start end is not folded back.

Abstract: A wound-type cell includes a first electrode plate; a second electrode plate; a separator, disposed between the first electrode plate and the second electrode plate; a first electrode tab electrically connected to the first electrode plate; and a second electrode tab electrically connected to the second electrode plate, in which the separator includes a third winding start end, the third winding start end is folded back to an inner side in a thickness direction and is disposed between the first electrode tab and the second electrode tab in a length direction.

Abstract: Provided is a wound cell, formed by winding of a first and second separator, a first and second electrode plate from start ends thereof, outermost circle of second electrode plate includes second single-side coated area, surface of which facing center of the wound cell is second blank current collector area not coated with second active material, portion of first electrode plate opposite to second blank current collector area includes first single-side coated area, surface of which away from the center of the wound cell is first blank current collector area not coated with first active material; tail end of first electrode plate contains first blank foil area, portion of second electrode plate opposite to first blank foil area contains second blank foil area; start ends of first and second single-side coated area are located at two opposite sides in thickness direction of the cell.

Abstract: The present application provides an electrode tab structure and a battery, the electrode tab structure includes: an electrode tab substrate; a current collector connected with the electrode tab substrate, a largest thickness after the electrode tab substrate being welded with the current collector is less than or equal to 1.5 times of a sum of a thickness of the electrode tab substrate and a thickness of the current collector. In the present application, the thickness of the electrode tab structure is suitably limited with respect to the sum of the thickness of the electrode tab substrate and the current collector, which avoids defect of too large welding resistance caused by too large thickness of the electrode tab structure, so as to improve internal symmetry of the cell, increase the reliability of the electrode tab structure, and avoid from deforming, which thereby improving the overall performance of the battery.

Abstract: Provided is a wound cell, formed by successively stacking and winding of first separator, first electrode plate, second separator and second electrode plate from head ends thereof, the first separator is located at innermost side of the flat-shaped cell; a first and second electrode tab is electrically connected with the first and second electrode plate, respectively; the first and second electrode tabs are located on a flat plane of the flat-shaped cell along a length direction thereof and do not overlap each other in a thickness direction thereof; a distance from the first or second electrode tab to a tail end of the first or second current collector is no larger than ? of total length of the first or second current collector, a sum of number of layers of the first separator and the second separator at the innermost side of the cell is no more than two.

Abstract: The present disclosure provides a wound-type cell which comprises: a first electrode plate having a first current collector and a first active material layer coated on a surface of the first current collector; a second electrode plate having a second current collector and a second active material layer coated on a surface of the second current collector, and a second winding start end of the second electrode plate is positioned at an inner side of a first winding start end of the first electrode plate in a thickness direction; a separator; a first electrode tab; and a second electrode tab. A third winding start end of the separator is positioned at an outer side of the second winding start end of the second electrode plate in a length direction, extends along a direction away from a second end of the second winding start end and is not folded back.

Abstract: The present disclosure provides a wound-type cell and a winding mandrel. The wound-type cell comprises: a first electrode plate having a blank first current collector which is positioned at a first winding start end and is not coated with the first active material layer; a second electrode plate having a blank second current collector which is positioned at a second winding start end and is not coated with the second active material layer, and the blank second current collector is positioned at an inner side of the blank first current collector; a separator; a first electrode tab; and a second electrode tab. A first end of the blank first current collector is beyond a second end of the blank second current collector in a length direction, and a position of the first electrode tab is beyond the second end of the blank second current collector in the length direction.

Abstract: A secondary battery comprises a cell. The cell includes a positive electrode plate having a positive current collector and a negative electrode plate having a negative current collector. The secondary battery further includes: a first positive electrode tab and a second positive electrode tab, one end of the first positive electrode tab is fixed on and electrically connects with the positive current collector, the other end of the first positive electrode tab extends to the outside of the cell; and/or, a first negative electrode tab and a second negative electrode tab, one end of the first negative electrode tab is fixed on and electrically connects with the negative current collector, the other end of the first negative electrode tab extends to the outside of the cell, one end of the second negative electrode tab is fixed on and electrically connects with the other end of the first negative electrode tab.

Abstract: The present invention belongs to the technical field of batteries, and more particularly, relates to a flexible battery pack, comprising a packaging film, an electrolyte filled in the packaging film, and at least two electrically-connected cells encapsulated in the packaging film, wherein at least one of the cells is a flexible cell. Compared with the prior art, the flexible battery pack in the present invention is provided with a flexible cell that serves as the flexible part, so that cell bends at the flexible part so as to avoid the effect of stress on the performances of the cells, improve the stability of the cells and improve the bendability of the battery pack. Furthermore, the flexible battery pack in the present invention is further capable of reducing the phenomenon of irregular bending, lowering the bending pressure of the packaging film and prolonging the service life of the battery pack.