Patent ID: 8450006

Claim:
A secondary battery, comprising: a plurality of electrode assemblies disposed in a same direction, each electrode assembly of the plurality of electrode assemblies including a first electrode plate with a first electrode non-coating portion, a second electrode plate with a second electrode non-coating portion, and a separator between the first electrode plate and the second electrode plate; a first collector plate contacting the first electrode non-coating portions of the plurality of electrode assemblies, the first collector plate electrically connecting the first electrode non-coating portions to each other in a parallel connection; and a case configured to contain the plurality of electrode assemblies and the first collector plate, wherein the first collector plate includes: a first welding portion protruding from a base portion toward the plurality of electrode assemblies, the base portion having a plate facing each of the first electrode non-coating portions of the plurality of electrode assemblies, and the first welding portion overlapping the plate of each of the first electrode non-coating portion, and a first sidewall extending from an edge of the base portion toward the plurality of electrode assemblies to surround the first electrode non-coating portions of the plurality of electrode assemblies.