Samsung Sdi Co., Inc.

Hyun Ki Jeong

Jung Hyun Park

June Hyoung Park

Nobuyuki Oyagi

Won Ik Lee

Seung Young Park

Sung Soo Park

Gun Gue Park

Young Chang Kim

Jae Gyun Doo

Dong Jin An

Ho Jae Lee

Sang Mi Lee

Min Yeol Choi

Ye Ji Cha

An electrode assembly and a secondary battery are provided. In an exemplary embodiment, an electrode assembly includes: a first electrode plate having a first electrode tab attached thereto; a second electrode plate having at least one second electrode tab attached thereto; and a separator between the first electrode plate and the second electrode plate, the electrode assembly wound in a state in which the first electrode plate, the separator, and the second electrode plate are stacked, and the first electrode plate includes coating portions formed by coating an active material on first and second surfaces thereof, and a half-coating portion formed by coating the active material on only one of the first and second surfaces at a region corresponding to a leading edge, on the basis of a winding direction, where an active material of the second electrode plate begins.

Electrode assembly and secondary battery comprising the same

The present invention relates to an electrode assembly and a secondary battery comprising same, wherein by adjusting at least one of a loading level of a positive electrode coating layer and a loading level of a negative electrode coating layer, the negative electrode coating layer can be prevented from unnecessarily increasing in capacity, and a minimum capacity ratio of a positive electrode versus a negative electrode can be maintained in order to minimize lithium precipitation according to the number of winding turns of an electrode assembly.

Electrode assembly and secondary battery comprising same

The present invention relates to a secondary battery in which an electrode assembly and a current collection plate may be easily welded and safety may be improved. As an embodiment, disclosed is a secondary battery comprising: an electrode assembly which is formed by winding a first electrode plate having a first electrode uncoated part, a separator, and a second electrode plate having a second electrode uncoated part, the first electrode uncoated part protruding upwards, and the second electrode uncoated part protruding downwards; and a first current collection plate which is electrically connected to the first electrode uncoated part and has a concave-convex part protruding downwards, wherein the width of the concave-convex part becomes wider from the center of the first current collection plate toward the outer periphery thereof.

Secondary battery

Disclosed is a secondary battery, which has a reinforced strength and can simplify the manufacturing process thereof. For example, one embodiment provides a secondary battery which comprises: an electrode assembly including a first electrode plate and a second electrode plate, wherein one of the first electrode plate and the second electrode plate includes a plurality of first tabs formed to protrude in one direction; a first current collection tab coupled to the first tabs; a case housing the electrode assembly; and a cap assembly coupled to the upper part of the case, wherein the first current collection tab is coupled to one of the cap assembly and the bottom surface of the case.

Secondary battery and manufacturing method therefor

An embodiment of the present invention relates to a secondary battery, and with respect to a technical problem to be resolved, provided is a secondary battery which has an electrode tab provided by forming a notch on a non-coated part of an electrode plate of an electrode assembly, and which can enable a current collecting plate to come into surface contact with the electrode tab. To this end, disclosed is a secondary battery comprising: an electrode assembly which comprises a first electrode plate coated with a first electrode active material and having a first non-coated part formed along an upper end thereof, a second electrode plate coated with a second electrode active material and having a second non-coated part formed along a lower end thereof, and a separator interposed between the first electrode plate and the second electrode plate, and which is wound in a jelly roll shape; a can for accommodating the electrode assembly; a cap assembly for sealing the can; a first current collecting plate electrically connected to the cap assembly by coming into contact with the first non-coated part; and a second current collecting plate electrically connected to the can by coming into contact with the second non-coated part, wherein the first non-coated part and/or the second non-coated part has a structure in which a plurality of isosceles trapezoidal electrode tabs are arranged to be adjacent to one another with notches formed at a specific angle (α) and at predetermined intervals from a start point thereof that is closest to a winding axis, and thus the first non-coated part and/or the second non-coated part are bent toward the winding axis.

The present invention provides an electrode assembly, which can reduce resistance and improve a process property, a secondary battery including same, and a method for manufacturing same. For example, disclosed is an electrode assembly comprising: a first electrode plate having a first electrode tab attached thereto: a plurality of second electrode plates having second electrode tabs attached thereto, respectively, and a separator interposed between the first electrode plate and the plurality of second electrode plates, wherein the first electrode plate, the separator, and the plurality of second electrode plates are wound in a state of being stacked on one another, and the second electrode tabs are formed to be symmetrical to each other on the basis of a winding center thereof.

Growing community of inventors

Yongin-si, South Korea

Hyun Ki Jeong