Secondary battery including electrode lead exposed within the sealing part and method for manufacturing the same
Disclosed are a secondary battery and a method for manufacturing the same. According to the present invention, since an external protrusion protruding from the outside of an exterior constituting a body of the secondary battery as a component through which a secondary battery according to a related art is electrically connected to external electric equipment is removed, the secondary battery may be reduced in volume under the same capacity.
1. A method for manufacturing a secondary battery, the method comprising:
a step of preparing an electrode assembly comprising an electrode and a separator and an exterior accommodating the electrode assembly, the exterior including an exterior body and a sealing part sealing an inner space defined by the exterior body;
a step of accommodating the electrode assembly in the exterior;
an insulation step of surrounding an electrode lead connected to the electrode assembly by using the exterior to form an insulation part formed by the exterior on the electrode lead; and
a notching step of removing a portion of the insulation part to form an exposure part, which is an area of the electrode lead that is exposed to an outside of the exterior, the electrode lead having a connection part connecting the electrode assembly with the exposure part and disposed inside the insulation part, the connection part extending in a first direction from the electrode assembly into the sealing part, the exposure part extending in a second direction from the connection part to the area that is exposed to the outside of the exterior, the second direction being perpendicular to the first direction,
wherein, during the notching step, at least a portion of the exposure part is formed inside the insulation part, and
wherein the insulation part surrounds an entirety of a periphery of the exposure part and the connection part.
2. The method of claim 1 , wherein the connection part is formed in an inner space formed by the exterior, the method further comprising a connection step of connecting the connection part to the electrode assembly.
3. The method of claim 1 , wherein, in the notching step, the exposure part is disposed within the outermost edge of the exterior.
4. The method of claim 1 , wherein an insulation member is disposed between the electrode lead and the exterior, and in the notching step, each of the exterior and the insulation member has through-holes in positions corresponding to a position of the exposure part.
5. The method of claim 1 , wherein the electrode lead is disposed between the sealing parts, and the method further comprising a folding step of folding the sealing part by using a folding part, which is a boundary between the exterior body and the sealing part, as a folding axis about which an entirety of the sealing part is rotated relative to the exterior body, such that a plane of the exposure part is oriented transverse to a plane of the electrode assembly.
6. The method of claim 1 , wherein, in the connection step, the connection part and the electrode assembly are connected to each other through welding.