A battery pack including a plurality of battery units with improved insulating and cooling properties between the battery units is provided. In one embodiment, a battery unit includes a battery cell and an insulating wall including a plurality of protrusions contacting the battery cell. The protrusions extend at least partly between opposite edges of the insulating wall and define space between the battery cell and regions between the protrusions.
1. A battery unit comprising:
a battery cell having a surface extending continuously between two opposite lateral edges, and comprising at least one electrode terminal extending vertically from a top or bottom of the battery cell; and
a cover body comprising a first insulating wall, a second insulating wall, and a third insulating wall, the first insulating wall comprising a plurality of protrusions contacting the surface of the battery cell, the protrusions each extending substantially vertically over the substantially entire length between opposite top and bottom edges of the first insulating wall and defining space between the battery cell and regions between the protrusions, a surface of at least one of the protrusions contacting the surface of the battery cell along an entire width of the protrusion and extending in the vertical direction,
wherein the second insulating wall protrudes from the bottom edge of the first insulating wall in a same direction as the protrusions, and the third insulating wall protrudes from the top edge of the first insulating wall in a same direction as the protrusions,
wherein the cover body has openings, each opening having four walls defined by the first insulating wall and the second insulating wall, and extending between the first insulating wall and the second insulating wall along the bottom edge of the first insulating wall, and aligned with the regions between the protrusions,
wherein the cover body has other openings, each of the other openings having four walls defined by the first insulating wall and the third insulating wall, and extending between the first insulating wall and the third insulating wall along the top edge of the first insulating wall, and aligned with the regions between the protrusions,
wherein the first insulating wall has a plurality of second openings at the regions between the openings and the other openings, and
wherein each of the protrusions further extends from the bottom edge of the first insulating wall to a bottom inner surface of the second insulating wall and from the top edge of the first insulating wall to a top inner surface of the third insulating wall.
2. The battery unit of claim 1 , wherein the third insulating wall further comprises at least one supporting member protruding from an edge thereof for holding the battery cell against the protrusions.
3. The battery unit of claim 1 , wherein the second insulating wall comprises at least one supporting member protruding from an edge thereof for holding the battery cell against the protrusions.
4. The battery unit of claim 1 , wherein the openings and the other openings are aligned with each other.
5. The battery unit of claim 1 , wherein the plurality of protrusions are parallel to each other.
6. The battery unit of claim 1 , wherein the plurality of second openings comprises a plurality of elongated openings aligned with the openings and extending at least partly between the opposite top and bottom edges of the first insulating wall.
7. The battery unit of claim 1 , wherein the plurality of second openings comprises a plurality of holes aligned with the openings and spaced apart from each other between the opposite top and bottom edges of the first insulating wall.
8. The battery unit of claim 1 ,
wherein the third insulating wall has an opening aligned with a vent member of the battery cell.
9. The battery unit of claim 1 , further comprising a radiation sheet on a side of at least one of the first insulating wall or the second insulating wall opposite the side on which the protrusions are located.
10. The battery unit of claim 1 , wherein an area at which the first insulating wall and the second insulating wall meet has a gradual curve.