Cap assembly, secondary battery and method for manufacturing the same, and battery pack
AssigneeLG Energy Solution, Ltd.
InventorAn Soo Jeong
Life of this patent
Estimating the term…
Abstract
The present invention relates to a secondary battery. The secondary battery includes a can configured to accommodate an electrode assembly; and a cap assembly bonded to an opening of the can. The cap assembly includes an upper cap provided in the opening and connected to an electrode tab of the electrode assembly and a lower cap configured to bond the upper cap to the opening. The lower cap includes a first bonding part bonded to a bottom surface of the upper cap to support the upper cap and a second bonding part formed on an outer circumferential surface of the first bonding part to fix the upper cap while being bonded to the upper cap.
Claims15
A secondary battery comprising:
- a can configured to accommodate an electrode assembly, the can having an opening and a beading part;
- and
- a cap assembly supported by a top surface of the beading part,
- wherein the cap assembly comprises:
- an upper cap provided in the opening and connected to an electrode tab of the electrode assembly;
- and
- a lower cap configured to bond the upper cap to the can within the opening,
- wherein the lower cap comprises:
- a first bonding part bonded to the top surface of the beading part, the first bonding part supporting a bottom surface of the upper cap;
- and
- a second bonding part formed on an outer circumferential surface of the first bonding part to fix the upper cap while being bonded to the upper cap.
A method for manufacturing a secondary battery, the method comprising:
- a cap assembly manufacturing step comprising an upper cap manufacturing process of manufacturing an upper cap and a lower cap manufacturing process of manufacturing a lower cap, which is provided with a first bonding part supporting a bottom surface of the upper cap and a second bonding part formed on an outer circumferential surface of the first bonding part to surround an outer circumferential surface of the upper cap;
- an electrode assembly accommodation step in which an electrode tab of an electrode assembly is connected to the upper cap by passing the electrode tab through the lower cap of the cap assembly to accommodate the electrode assembly in a can;
- a cap assembly insertion step of inserting the cap assembly into an opening of the can such that the first bonding part of the lower cap engages a top surface of a beading part of the can;
- and
- a cap assembly bonding step comprising a primary bonding process in which an outer circumferential surface of the opening of the can is heated to melt the first bonding part of the lower cap to the top surface of the beading part, and to melt the second bonding part of the lower cap to bond the cap assembly to the opening.
Dependencies are inferred from the claim text.