To effectively dissipate heat of respective batteries to the outside of an outer package case with simple heat dissipation structure.
The battery pack houses a battery assembly 9, which is formed by connecting end part electrodes 1A of the plurality of batteries 1 by a lead plate 3, in the outer package case 2. The outer package case 2 houses the respective batteries 1 in positions in which the end part electrodes 1A face an inner surface of a heat dissipation case part 10 arranged on at least one surface of facing surfaces. In the battery pack, the lead plate 3 connected to the end part electrodes A of the batteries 1 is thermally bonded to the inner surface of the heat dissipation case part 10. The outer package case 2 is formed of plastic, and includes an inner surface protrusion 12 thermally bonded to the lead plate 3 in a surface-contacting state by protruding from an inner surface of the heat dissipation case part 10. The heat dissipation case part 10 includes a recessed part 13 on an outer side of the inner surface protrusion 12, and heat of the battery 1 is thermally conducted to the inner surface protrusion 12 of the heat dissipation case part 10 from the lead plate 3, and the heat is dissipated from the outer package case 2 to the outside.
COPYRIGHT: (C)2010,JPO&INPIT
Hiroshi Fukukawa
Maki Haino
Shingo Yoneyama
Junji Terada
Toshiro Kondo
YAMAHA HATSUDOKI KABUSHIKI KAISHA
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