Battery sub-packing unit

1. A battery sub-packing unit comprising:

at least one battery cell comprising an electrode tab; and

a case comprising:

a surrounding cover accommodating the at least one battery cell in an internal space; and

an end panel comprising:

an edge portion face coupled to the surrounding cover and formed of a metal material;

a central portion completely surrounded by the edge portion face and formed of an insulating material;

a slit opening formed on the central portion through which the electrode tab extends out of the case; and

a sub-vent hole formed on the edge portion face and communicating between the internal space and a pace external to the

wherein the surrounding cover surrounds the at least one battery cell in a circumferential direction of the end panel.

2. The battery sub-packing unit of claim 1 ,

wherein the end panel includes a front end panel and a rear end panel, and

wherein the front and rear end panels are respectively coupled to front and rear end portions of the surrounding cover of the case.

3. The battery sub-packing unit of claim 2 , wherein the end panel comprises a sub-guide tube disposed around the sub-vent hole, communicating with the sub-vent hole, and extending in an outward direction.

4. The battery sub-packing unit of claim 2 , wherein the edge portion face of the end panel is coupled by welding to the front end portion and the rear end portion of the surrounding cover, respectively.

5. The battery sub-packing unit of claim 2 , wherein the surrounding cover comprises at least one of aluminum, stainless steel, or a metal having a melting point of 1000° C. or higher.

6. The battery sub-packing unit of claim 2 , wherein the surrounding cover comprises:

an accommodating can having the front and rear end portions to which the front and rear end panels are respectively coupled, the accommodating can surrounding a lower surface portion and a side surface portion of the at least one battery cell; and

an upper panel coupled to an upper end portion of the accommodating can and surrounding an upper surface portion of the at least one battery cell.

7. The battery sub-packing unit of claim 6 , wherein the accommodating can comprises a coupling tongue protruding into the external space at the upper end portion of the accommodating can, and

wherein the upper panel comprises an extended flange portion including a coupling groove coupled to the coupling tongue.

8. The battery sub-packing unit of claim 2 , wherein the surrounding cover comprises:

an accommodating can having the front and rear end portions to which the front and rear end panels are respectively coupled, and surrounding a lower surface portion and a side surface portion of the at least one battery cell; and

a pair of upper fastening portions extending in opposite directions from both side walls of the accommodating can, and fastened to each other to surround the upper surface portion of the at least one battery cell.

9. The battery sub-packing unit of claim 8 , wherein each of the pair of upper fastening portions comprises:

a first fastening portion extending from one side wall of the accommodating can, having a hook protruding toward the one side wall of the accommodating can; and

a second fastening portion extending from another side wall of the accommodating can and having an accommodation groove into which the hook is accommodated.

10. The battery sub-packing unit of claim 1 , further comprising an inner pad disposed in the internal space of the case, contacting the at least one battery cell accommodated in the case, and

wherein the inner pad is configured to generate at least one of carbon dioxide or nitrogen during oxidation for filling the internal space of the case to block inflow of external oxygen.

11. The battery sub-packing unit of claim 10 , wherein the inner pad is formed of a melamine material.

12. The battery sub-packing unit of claim 10 , wherein the inner pad is disposed in at least one of between a side surface of the at least one battery cell and an inner surface of the case and between an upper surface of the at least one battery cell and the inner surface of the case.

13. The battery sub-packing unit of claim 10 , wherein the at least one battery cell is provided as a plurality of battery cells, and the inner pad is disposed between battery cells adjacent to each other among the plurality of battery cells.

14. The battery sub-packing unit of claim 13 , wherein the inner pad comprises a pad flange portion extending from both ends of the inner pad toward the electrode tab of the at least one battery cell adjacent to the inner pad.

15. A battery sub-packing unit comprising:

at least two battery cells each comprising an electrode tab;

an inner pad separating the at least two battery cells; and

a case enclosing the at least two battery cells and the inner pad;

wherein the case comprises an accommodating can, front and rear end panels coupled to front and rear end portions of the accommodating can, and a pair of upper fastening portions extending in opposite directions from opposite side walls of the accommodating can, and

wherein the pair of upper fastening portions are coupled to each other to secure the case around the at least two battery cells,

wherein each of the front and rear end panels includes:

an edge portion face coupled to the accommodating can and formed of a metal material;

a central portion completely surrounded by the edge portion face, and formed of an insulating material;

at least two slit openings formed on the central portion through which the electrode tab extends out of the case; and

at least one sub-vent formed on the edge portion face for allowing fluid communication between an interior of the case and an outside of the case,

wherein the accommodating can surrounds at least a portion of the at least two battery cells in a circumferential direction of the front and rear end panels.

16. The battery sub-packing unit of claim 15 , wherein the coupling of the first and second fastening portions includes latching a plurality of hooks of the first fastening portion with a corresponding plurality of accommodation grooves of the second fastening portion.

17. The battery sub-packing of claim 15 , wherein the inner pad is in direct contact with the at least two battery cells and is configured to generate at least one of carbon dioxide or nitrogen during oxidation to block inflow of external oxygen inside the case.

18. The battery sub-packing unit of claim 15 , wherein the inner pad is formed of a melamine material.