Impact resistant battery pack
A battery pack including a cell having a surface including a coupling groove, a circuit board electrically connected to the cell, a coupling member coupled to the cell, having one end coupled to the circuit board and another end having a coupling hole corresponding to the one coupling groove, a cover surrounding the circuit board, mounted on one surface of the cell, and having a through-hole, a screw coupled to the coupling groove through the through-hole, and an elastic supporting member disposed between a head part of the screw and the coupling member.
1. A battery pack, comprising:
a cell having a surface including a coupling groove;
a circuit board electrically connected to the cell;
a coupling member, the coupling member having one end coupled to the circuit board, the coupling member having another end contacting the surface of the cell and having a coupling hole therein, the coupling hole corresponding to the coupling groove;
a cover surrounding the circuit board, the cover contacting the surface of the cell adjacent to the coupling groove, the cover having a mounting groove and a through-hole corresponding to the coupling groove, the mounting groove surrounding the through-hole;
a screw coupled to the coupling groove through the coupling hole and the through-hole, the screw having a head part and a body part extending from the head part, an underside of the head part contacting a bottom surface of the mounting groove; and
an elastic supporting member contacting the underside of the head part of the screw and an upper side of the coupling member, at least a part of the elastic supporting member being inside the through-hole, the elastic supporting member being in a compressed state and exerting a restoring force against the upper side of the coupling member to bias the coupling member against the surface of the cell.
2. The battery pack as claimed in claim 1 , wherein the through-hole passes through a center of the mounting groove.
3. The battery pack as claimed in claim 2 , wherein the elastic supporting member is in the shape of a cylinder-type washer, and a sidewall of the washer has a height that is greater than its thickness.
4. The battery pack as claimed in claim 2 , wherein one end of the elastic supporting member is flush with a contact part of the mounting groove.
5. The battery pack as claimed in claim 2 , wherein the elastic supporting member has a cylinder shape, a sidewall of the elastic supporting member has a height that is greater than a thickness of the elastic supporting member, and the sidewall of the elastic supporting member includes a bending part that protrudes outward at an outer circumferential surface of the elastic supporting member.
6. The battery pack as claimed in claim 2 , wherein a diameter of the coupling groove in the cell is inversely proportional to a depth of the coupling groove.
7. The battery pack as claimed in claim 2 , wherein the coupling groove includes a burr prevention space adjacent to the coupling member, the burr prevention space having a diameter d 2 , and a main coupling groove area, the main coupling groove area having a diameter d 1 , and the diameter of the burr prevention space d 2 is greater than the diameter of the main coupling groove area d 1 .
8. The battery pack as claimed in claim 7 , wherein the diameter d 2 of the burr prevention space is about 10 to about 30% greater than the diameter d 1 of the main coupling groove area.
9. The battery pack as claimed in claim 2 , wherein the cover is coupled to the coupling member and the coupling member is in contact with the cell.
10. The battery pack as claimed in claim 1 , wherein the coupling member includes:
a first region soldered to the circuit board;
a second region bent substantially perpendicular to the first region; and
a third region including the coupling hole, and bent to be substantially perpendicular to the second region in a direction away from the first region.
11. The battery pack as claimed in claim 1 , wherein the elastic supporting member is in the shape of a cylinder-type washer, and a sidewall of the washer has a height that is greater than its thickness.
12. The battery pack as claimed in claim 1 , wherein the elastic supporting member is coupled to the through-hole through at least one of thermally inserting, tightly inserting, bonding, and screw coupling.
13. The battery pack as claimed in claim 1 , wherein the elastic supporting member includes:
a combining part having a center hole in a center of the elastic supporting member; and
a hoop part connected to the combining part, protruding from a circumferential surface of the combining part, and having a diameter greater than a diameter of the combining part,
wherein the combining part is coupled to the coupling hole, and the hoop part is coupled to the coupling member.
14. The battery pack as claimed in claim 1 , wherein a diameter of the coupling groove is inversely proportional to a depth of the coupling groove.
15. The battery pack as claimed in claim 1 , wherein the coupling groove includes a burr prevention space adjacent to the coupling member and having a diameter d 2 , and a main coupling groove area having a diameter d 1 , and the diameter of the burr prevention space d 2 is greater than the diameter of the main coupling groove area d 1 .
16. The battery pack as claimed in claim 15 , wherein the diameter d 2 of the burr prevention space is about 10 to about 30% greater than the diameter d 1 of the main coupling groove area.
17. The battery pack as claimed in claim 1 , wherein the cover is coupled to the coupling member and the coupling member is in contact with the cell.