Battery connecting unit and battery pack including the same

A battery pack, comprising:

• a lower housing including at least one battery connecting unit;
• a battery laminate accommodated in the lower housing and electrically connected to the battery connecting unit;
• and
• an upper housing made of plastic and configured to cover the lower housing and the battery laminate,
• wherein the battery connecting unit includes a metal terminal and a plastic member partially surrounding the metal terminal,
• wherein the metal terminal is provided through the upper housing, and the plastic member is fixed to the upper housing at a lower portion of the upper housing,
• wherein the plastic member extends into the upper housing through an upper surface of the upper housing,
• wherein the metal terminal is made of a circular pillar and includes an annular protrusion and a gear-shaped protrusion pattern, formed at a sidewall of the circular pillar, in the lower portion of the metal terminal, and the circular pillar of the metal terminal serves as a plug contact at the upper portion of the metal terminal,
• wherein the plastic member includes a lower buffer and an upper buffer which are positioned in order and formed integrally,
• wherein the lower buffer has a cylindrical shape to surround the annular protrusion, and
• wherein the upper buffer has a cylindrical shape with a greater outer diameter than the lower buffer to surround the gear-shaped protrusion pattern.

A battery pack, comprising:

• a lower housing including at least one battery connecting unit;
• a battery laminate accommodated in the lower housing and electrically connected to the battery connecting unit;
• and
• an upper housing made of plastic and configured to cover the lower housing and the battery laminate,
• wherein the battery connecting unit includes a metal terminal and a plastic member partially surrounding the metal terminal,
• wherein the metal terminal is provided through the upper housing, and the plastic member is fixed to the upper housing at a lower portion of the upper housing,
• wherein the plastic member extends into the upper housing through an upper surface of the upper housing, and
• wherein the upper housing has a concave portion formed at one side in contact with the plastic member to accommodate the plastic member and a convex portion formed at the other side to correspond to the concave portion.