Stolmár & Partner Patentanwälte PartG mbB

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.

A cathode active material for a secondary battery includes a plurality of a lithium metal oxide particle. A molar ratio of manganese based on total moles of all metal elements excluding lithium in the lithium metal oxide particle is in a range from 0.15 to 0.3, and a molar ratio of cobalt based on total moles of all metal elements excluding lithium in the lithium metal oxide particle is 0.05 or less. An R-factor of the lithium metal oxide particle is in a range from 0.45 to 0.57.

A cathode active material for a secondary battery includes a lithium metal oxide particle which contains nickel and cobalt and has a single particle structure. A content of cobalt increases in a direction from a particle center to a particle surface in at least a portion of a region between the particle center and the particle surface. The content of cobalt is in a range from 3 mol% to 20 mol%, and a content of nickel is in a range from 60 mol% to 90 mol% among elements of the lithium metal oxide particle excluding lithium and oxygen.

The present disclosure relates to a separator, a method for manufacturing the same, and an electrode assembly including the same. The separator according to one aspect comprises: a substrate; and a coating layer formed on at least one surface of the substrate, wherein the coating layer comprises an inorganic material and a first binder, a glass transition temperature of the first binder is 100 °C or less, and the following Equation 1 can be satisfied: 1.2≤DB1/TC≤2.0In Equation 1, D_B1 is a particle diameter (D50) at a volume fraction of 50% in a cumulative particle size distribution of the first binder, and T_c is a thickness of the coating layer.

The present disclosure relates to a battery assembly and a method for reducing risk of thermal runaway therein. A battery assembly according to one embodiment of the present disclosure comprises at least two battery cells; and a barrier disposed between the two battery cells, wherein the barrier comprises a sheet-shaped blocking layer, a surface pressure layer stacked on at least one surface of the blocking layer, the surface pressure layer comprises a first region in contact with the blocking layer and a second region which is a region other than the first region, and a protective layer may be stacked on at least a portion of the second region.

Provided are a secondary battery and a method of manufacturing the same. According to one aspect of the present disclosure, a secondary battery may be provided, which includes an electrode assembly provided with an electrode tab, a can that accommodates the electrode assembly and has a coupling hole provided in an outer part of one surface facing the electrode tab, and a terminal inserted into the coupling hole and electrically connected to the electrode tab.

Proposed is an electrode assembly including a positive electrode plate, a separator, and a negative electrode plate sequentially stacked, wherein the positive electrode plate may include a first side region provided with a positive electrode external-connection non-coated part for electrical connection to an external terminal or lead, a non-coated part in a predetermined portion of a second side region, opposite to the first side region, where an active material layer is not formed, a coated part between the first and second side regions, where an active material layer is formed except for the non-coated part, and a positive electrode insulation coating part formed in the first side region of the positive electrode plate, extending from a boundary between the non-coated part and the coated part toward an end of the first side region of the positive electrode plate.

A cathode active material for a secondary battery according to one embodiment of the present disclosure includes a lithium metal oxide and has a C-axis lattice retention ratio (R<CL>) of 95% to 97%, as defined by Equation 1 below. R CL = C min / C max × 100 <img class="EMIRef" id="51ee46e0-3fd6-40b8-ad8e-5f161359beda-ia01" /> in Equation 1, R<CL> denotes the C-axis lattice retention ratio, and C<min> and C<max> respectively denote the minimum and maximum values of the C-axis lattice constant of the cathode active material, as observed by X-ray diffraction (XRD) analysis while the charge voltage is increased to a terminal voltage.

A battery pack is disclosed. According to the present disclosure, there is provided a battery pack including one or more battery modules, wherein the battery module includes: a plurality of battery cells disposed between a first cover and a second cover; and an inner column extending in a third direction between adjacent battery cells to dissipate heat transferred from side surfaces of the battery cells to at least one of the first cover and the second cover.