SK On Patente

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Pouch folding methods and devices are disclosed. In some embodiments, a pouch folding method includes applying heat to a wing of a cell pouch to obtain a heated wing, and folding the heated wing of the cell pouch.

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The battery assembly of the present disclosure comprises a case, a plurality of battery cells accommodated in an inner space of the case, a barrier member disposed between the plurality of battery cells, and a sealing member surrounding an upper end, a left end, and a right end of the barrier member, thereby improving thermal stability and delaying heat propagation to adjacent battery cells.

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A positive electrode for a lithium secondary battery according to embodiments of the present disclosure comprises a positive electrode active material layer containing a positive electrode active material and having a density of 3 g/cm<3> or more, wherein the positive electrode active material includes lithium metal oxide particles containing cobalt, the content of cobalt being 0 mol% (exclusive) to 15 mol% (inclusive) relative to the total number of moles of elements excluding lithium and oxygen. The difference between the charge/discharge efficiency and the charge/discharge efficiency after 10 additional charge/discharge cycles in a half-cell comprising the positive electrode for a lithium secondary battery is less than 1%.

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The battery module of the present disclosure includes a main body portion that supplies or stores electrical energy and tab portions that protrude from one side of the main body portion, and comprises: a plurality of battery cells stacked in a preset first direction; 8 a module case accommodating the plurality of battery cells; a plurality of first bus bars, which are coupled to any one of first surfaces of the tab portions formed in a second direction in which the tab portions protrude within the module case and in a third direction perpendicular to the first direction and the second direction, and are provided in a number as many as that of the tab portions; and a second bus bar which extends in the first direction inside the module case and is coupled to at least some of the plurality of first bus bars to electrically connect the plurality of battery cells to the outside.

A positive active material for a rechargeable lithium battery according to embodiments of the present disclosure comprises lithium metal phosphate particles containing manganese and iron, the proportion of manganese being in a predetermined range.

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A bus bar and a battery module are disclosed. According to one embodiment of the present disclosure, a bus bar comprises a front coupler; a bridge extending rearward from the front coupler; and a rear coupler extending rearward from the bridge. The bridge may comprise a front hump extending rearward from the front coupler and convex upward; a valley extending rearward from the front hump and convex downward; and a rear hump extending rearward from the valley, connected to the rear coupler, and convex upward.

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The present disclosure relates a battery module and a method for manufacturing the battery module, the method including an application process of applying an adhesive material to at least one surface of a battery cell unit, wherein a plurality of battery cells are stacked in the battery cell unit, and the battery cells comprise a cell assembly and a tab protruding from the cell assembly, and wherein in the application process, the adhesive material is applied to one side of the at least one battery cell from which the tab does not protrude.

A composite membrane for an electrolyte according to an embodiment disclosed herein comprises an ionic conductive polymer and inorganic particles, wherein the ionic conductive polymer includes a polyurethane-based compound, and the composite membrane for an electrolyte has an elongation at break of 50% or more.

A battery cell manufacturing method of the present disclosure comprises: an insertion step of inserting a cap part into an opening; and a connection step of irradiating a laser at the cap part and a body part so as to connect the cap part to the body part, wherein, a welding bead for connecting the cap part to the body part is formed in the connection step, and the welding bead can satisfy formula 1. (Formula 1) T ≤ D (In formula 1, D is the thickness of a welding bead with respect to the cross-section of a battery cell in the thickness direction of a cap part, and T is the thickness of the cap part.)

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According to embodiments of the present disclosure, the electrode for a lithium secondary battery may comprise: an electrode current collector; a surface modification layer disposed on the electrode current collector; and a porous layer disposed on the surface modification layer. The lithium secondary battery may include an electrode for a lithium secondary battery and a counter electrode. Stability and electrochemical characteristics of the lithium secondary battery can be improved.

An electrolyte for a rechargeable lithium battery, according to embodiments of the present disclosure, comprises: a lithium salt; an organic solvent; and a fluorine-based additive of a specific chemical formula. The rechargeable lithium battery comprises: an electrode assembly which comprises a positive electrode comprising a lithium-transition metal oxide having a lithium molar ratio of 1.1 or more, and a negative electrode facing the positive electrode; and an electrolyte which is impregnated in the electrode assembly and comprises a fluorine-based additive of a specific chemical formula. Through the fluorine-based additive, electrolyte side reactions can be prevented, and the high-voltage charging stability and high-temperature lifespan characteristics of a positive electrode active material can be improved.

This disclosure relates to a primer solution for manufacturing an electrode, the primer solution for manufacturing an electrode comprising a binder and an antifoaming agent, wherein a content of the antifoaming agent is 0.00001 wt% to 3.2 wt% based on a total weight of the primer solution for manufacturing an electrode.

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