Secondary battery
View Patent ↗A secondary battery including a case providing an inner space; at least one electrode assembly, the at least one electrode assembly including a stacked and wound positive electrode plate, negative electrode plate, and separator between the positive electrode plate and the negative electrode plate, and being disposed within the case and including a non-coating portion on an end thereof; a collector plate including alternately arranged crests and troughs, the non-coating portion of the electrode assembly being disposed on the crests and the crests being welded to the non-coating portion; a collector terminal coupled to one end of the collector plate, the collector terminal protruding upwardly from the case; and a cap plate on an upper portion of the case, the cap plate sealing the case.
1. A secondary battery, comprising:
a case providing an inner space;
at least one electrode assembly, the at least one electrode assembly:
including a stacked and wound positive electrode plate, negative electrode plate, and separator between the positive electrode plate and the negative electrode plate, and
being disposed within the case and including a non-coating portion on an end thereof;
a collector plate including alternately arranged crests and troughs, the non-coating portion of the electrode assembly directly contacting the crests at a lower portion of an inflection point of the crests, and the crests being welded to the non-coating portion, wherein the troughs extend into the non-coating portion of the electrode assembly and electrically connect adjacent crests;
a collector terminal coupled to one end of the collector plate, the collector terminal protruding upwardly from the case; and
a cap plate on an upper portion of the case, the cap plate sealing the case.
2. The secondary battery as claimed in claim 1 , wherein the non-coating portion is concentrated adjacent to a lower portion of each of the crests and welded thereto.
3. The secondary battery as claimed in claim 1 , wherein the collector plate includes:
a through-hole therethrough in a central portion of the crests, the non-coating portion being exposed through the through-hole, or
a welding groove, the welding groove reducing a thickness of the crest.
4. The secondary battery as claimed in claim 3 , wherein the non-coating portion is concentrated adjacent to the through-hole or the welding groove of the collector plate and welded.
5. The secondary battery as claimed in claim 4 , wherein the non-coating portion is congregated adjacent to the through-hole or the welding groove along a lower portion of each of the troughs.
6. The secondary battery as claimed in claim 3 , wherein the through-hole of the collector plate is defined along a curved shape of the crest.
7. The secondary battery as claimed in claim 1 , wherein the collector plate has a welding groove defined therein and the collector plate and welding groove have a width less than that of the non-coating portion.
8. The secondary battery as claimed in claim 1 , wherein the collector plate is coupled to the non-coating portion by a butt welding process.
9. The secondary battery as claimed in claim 1 , wherein the collector plate has a pair of ends and the collector terminal is welded and coupled to both ends of the collector plate in a width direction of the collector plate.
10. The secondary battery as claimed in claim 1 , wherein the collector plate is compressed in a width direction of the non-coating portion and welded to the non-coating portion.
11. The secondary battery as claimed in claim 10 , wherein the collector plate is welded to the non-coating portion in the width direction of the non-coating portion without a gap between the collector plate and the non-coating portion.
12. The secondary battery as claimed in claim 1 , wherein the collector plate has a wave shape in cross section, the wave shape being formed by the alternately arranged crests and troughs.