A battery comprises: a battery cell; and tabs configured as one pair of an anode tab and a cathode tab and included in the battery cell. At least one of the anode tab and the cathode tab is configured in such a way that a welding region exposed outside the battery cell and a reaction region positioned in the battery cell are formed of different metals and are joined to each other.
1. A battery comprising:
a battery cell;
a first tab extending from inside the battery cell to outside the battery cell and including a first reaction region and a first welding region,
a second tab extending from inside the battery cell to outside the battery cell and including a second reaction region and a second welding region;
wherein the first reaction region extends from the battery cell in a first direction,
wherein the first welding region extends from the first reacting region to outside the battery cell in the first direction,
wherein the first reaction region and the first welding region are arranged side by side in the first direction and do not overlap each other,
wherein the second reaction region extends from the battery cell in a second direction,
wherein the second welding region extends from the second reacting region to outside the battery cell in the second direction,
wherein the second reaction region and the second welding region are arranged side by side in the second direction and do not overlap each other,
wherein the first welding region is formed of the same material as the second welding region, and
wherein first reaction region is formed of different material from the second reaction region.
2. The battery of claim 1 ,
wherein the first welding region is formed of a single layer, and
wherein the second welding region is formed of a single layer.
3. The battery of claim 1 ,
wherein the second direction is the same as the first direction, and
wherein the first tab and the second tab extend in parallel to each other.
4. The battery of claim 1 ,
wherein the first reaction region includes a first metal,
wherein each of the first welding region, the second reaction region, and the second welding region includes a second metal, and
wherein the second metal is different from the first metal.
5. The battery of claim 1 ,
wherein the second reaction region includes a first metal,
wherein each of the second welding region, the first reaction region, and the first welding region includes a second metal, and
wherein the second metal is different from the first metal.
6. The battery of claim 1 ,
wherein the first reaction region is not exposed to outside the battery, and
wherein the second reaction region is not exposed to outside the battery.
7. The battery of claim 1 ,
wherein the first welding region and the second welding region are welded to each other.
8. The battery of claim 1 , further comprising:
a sealant provided along a fringe of the battery cell and sealing the battery cell,
wherein the sealant further extends (i) between the first reaction region and the first welding region, (ii) between the second reaction region and the second welding region, or (iii) both.
9. The battery of claim 1 ,
wherein the battery is a secondary lithium battery,
wherein the first reaction region includes Cu, and
wherein each of the first welding region, the second reaction region, and the second welding region includes Al.
10. The battery of claim 1 ,
wherein the battery is a secondary lithium battery,
wherein the second reaction region includes Al, and
wherein each of the second welding region, the first reaction region, and the first welding region includes Cu.