Stolmár & Partner Patentanwälte PartG mbB

A battery cell is disclosed. In some implementations, the battery cell includes: an electrode assembly; a cell case; a cap plate; an electrode terminal including a coupling hole; and a current collector, wherein the current collector includes a current collecting plate and a current collecting pin connected to the current collecting plate and inserted into the coupling hole, the current collecting pin includes a first portion disposed at an outer side spaced apart from the current collecting plate, a third portion connected to the current collecting plate, and a second portion disposed between the first portion and the third portion, and at least one of an outer diameter of the second portion or a maximum outer diameter of the third portion is greater than an outer diameter of the first portion.

A battery cell is disclosed. In some implementations, the battery cell includes: an electrode assembly including a cathode, an anode, and a separator; a cell case accommodating the electrode assembly; a cap plate connected to the cell case; an electrode terminal disposed in the cap plate and including a coupling hole; and a current collector electrically connecting the electrode assembly and the electrode terminal, wherein the current collector includes a current collecting plate electrically connected to the electrode assembly and a current collecting pin connected to the current collecting plate and welded to the electrode terminal in a state of being fitted into the coupling hole, and the current collecting pin includes a hollow portion recessed toward the current collecting plate at a first end spaced apart from the current collecting plate.

A battery cell includes an electrode assembly including a first electrode, a second electrode having a polarity opposite to that of the first electrode, and a separator configured to separate the first electrode from the second electrode, a case configured to accommodate the electrode assembly, a through-hole passing through one side of both sides of the case, a terminal part of which a portion is inserted into the through-hole and which is electrically connected to one of the first electrode and the second electrode, and a cover member that is in contact with one surface of the case and configured to surround the terminal part.

A battery cell according to an embodiment of the present disclosure includes an electrode assembly; a case including at least one opening and including an accommodation portion accommodating the electrode assembly; and a cap assembly coupled to the case, wherein the cap assembly includes a cap plate coupled to the opening; and a cap insulator disposed between the cap plate and the electrode assembly to insulate the cap plate from the electrode assembly, and wherein the cap insulator includes a first insulator formed of a first material, and a second insulator formed of a second material, different from the first material.

An anode for a lithium secondary battery includes an anode current collector, and an anode active material layer formed on the anode current collector and including an anode active material, a binder and a nitrate. A concentration gradient of the binder in a thickness direction from a top surface of the anode current collector to a top surface of the anode active material layer is 0.1 wt%/µm or less. The concentration gradient of the binder is calculated from contents of a dye adsorbed to the binder measured at multiple points along a line in the thickness direction on a cross-section of the anode active material layer through an SEM-EDS and a thickness of the anode active material layer.

The present disclosure relates to a cathode for a lithium secondary battery including a cathode current collector; and a cathode composite layer formed on the cathode current collector, wherein the cathode composite layer includes a first cathode composite layer on a side of the cathode current collector, and a second cathode composite layer on a surface side of the cathode composite layer, wherein the first cathode composite layer includes a first cathode active material of lithium transition metal composite oxide particles in forms of secondary particles in which primary particles are aggregated, and a binder, wherein the second cathode composite layer includes a second cathode active material of lithium transition metal composite oxide particles in forms of single particles, and a binder.

A cathode active material including: an active material 1 comprising secondary particles; and an active material 2 comprising single particles, wherein the active material 1 and the active material 2 have a bimodal particle diameter distribution, respectively, the active material 1 has an average particle diameter (D50) of 9 µm to 17 µm, and the active material 2 has an average particle diameter (D50) of 2.5 µm to 4 µm, is disclosed.In some implementations, a cathode active material having high packing density may be provided.

The present disclosure relates to a battery assembly. The battery assembly may comprise: a plurality of battery cells arranged along a stacking direction; and a housing case containing the plurality of battery cells and including at least one end plate; wherein the end plate has a length dimension that extends parallel to the stacking direction and forms a first side of the housing case. The at least one end plate has one or more first type of venting holes penetrating it. The battery assembly possesses improved thermal stability, extended battery life and improved structural stability.

The present disclosure relates to an electrode current collector comprising an electrode sheet including an electrically conductive material, a first pattern portion protruding or recessed in a stacking region provided on at least one surface of the electrode sheet, and a second pattern portion protruding or recessed from the first pattern portion, and to an electrode including the same, wherein an average surface roughness of the electrode sheet in the stacking region is greater than 0.2 µm.

A separator for a secondary battery according to the present disclosure includes a substrate and a coating layer on a surface of the substrate, the coating layer including inorganic particles. The substrate orientation degree, which is calculated from a puncture strength of the separator and a weight per unit area of the substrate, may be within a predetermined range. A secondary battery according to the present disclosure includes an electrode assembly including a cathode, an anode, and the separator for a secondary battery according to the present disclosure. The thermal stability of the separator and the secondary battery may be improved.