Lg Energy Solution, Ltd.

Mi Jung Yoo

Woo Yong Lee

Min Jung Kim

Byung Heon Shin

Young Hoon Lee

A method for manufacturing a secondary battery includes an electrode assembly preparation step of preparing an electrode assembly on which flat top and bottom surfaces are formed, a first pressing step of pressing the top and bottom surfaces of the electrode assembly by using a first pressing device, on which a curved surface is formed, to form a curved surface, which has a shape corresponding to that of the curved surface formed on the first pressing device, on each of the top and bottom surfaces of the electrode assembly, an accommodation step of accommodating the electrode assembly in a pouch type exterior in which a cup having a concave shape is formed, and a second pressing step of pressing the curved surfaces of the top and bottom surfaces of the electrode assembly and an outer surface of the pouch type exterior by using a second pressing device.

Secondary battery and method for manufacturing the same

A secondary battery, a method for manufacturing the secondary battery, and a battery pack including the secondary battery is provided. The secondary battery has a curved surface that is manufactured without a separate pressing process for forming the curved surface.

Secondary battery, method for manufacturing the secondary battery, and battery pack comprising the secondary battery

A method for manufacturing the electrode assembly includes: a first step of preparing a plurality of radical units, each of which is manufactured by alternately stacking an electrode and a separator; a second step of stacking the plurality of radical units to manufacture an electrode stack; and a third step of pressing an outer surface of the electrode stack to manufacture an electrode assembly on which a curved surface having a curvature radius is formed on the electrode stack, wherein, when the sum of bonding force remaining after the third step among bonding force between the electrode and the separator as bonding force generated before the third step is defined as F1, the sum of force by which the electrode and the separator are spread again so that shapes of the electrode and the separator return to shapes before the electrode stack is pressed in the third step is defined as R, and the sum of bonding force additionally generated between the electrode and the separator within the electrode assembly by the third step is defined as F2, expression: F1+R&#x2264;F2 is satisfied.

Method for manufacturing electrode assembly

An electrode assembly including an electrode stack including a plurality of radical units including an electrode and a separator and having a structure in which the plurality of radical units are sequentially stacked, wherein at least a portion of a circumference of the electrode stack is surrounded by the separator, a curved surface having a curvature radius is formed on a top or bottom surface of the electrode stack, and the separator surrounding at least the portion of the circumference of the electrode stack surrounds the curved surface formed on the electrode stack to maintain a relative distance between the radical units adjacent to each other is provided. A method of forming the electrode assembly is also provided.

Growing community of inventors

Daejeon, South Korea

Mi Jung Yoo