Battery pack for power surgical hand piece with heat dissipating means

A battery powered surgical handpiece system comprising:

• a surgical instrument including a housing containing a motor and a motor controller portion, and
• a battery pack configured for detachably coupling to the surgical instrument, the battery pack including a thermoelectric cooler,
• wherein, when the battery pack is operatively coupled to the surgical instrument, the thermoelectric cooler is thermally coupled between the motor controller portion and a thermally conductive element supported by the battery pack, the thermally conductive element being movable between a first position where the thermally conductive element is spaced apart from an internal housing of the battery pack and a second position where the thermally conductive element is thermally coupled to and between an external housing of the battery pack and the internal housing of the battery pack, and
• wherein the battery pack further includes a microcontroller-controlled actuator configured for selectively actuating the thermally conductive element between the first position and the second position.