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1. (EP1118132) BATTERY PACK AND POWER TOOL USING THE SAME
Nota: O texto foi obtido por processos automáticos de reconhecimento ótico de caracteres.
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Claims

1. A battery pack comprising:

a plurality of batteries (1) having a plurality of layers stacked up in three stages or more,

a case (2) having a first face and a second face opposite said first face, the case enclosing said plurality of batteries (1),

a heat collector (5) disposed around a first battery position at an inner side of said plurality of layers,

a heat radiator (3) placed on an outer side of the first face of said case (2), said heat radiator (3) being connected with said heat collector (5),

a heat transfer plate (4) placed at the second face of said case (2), and

a second heat transfer unit (7) placed between said heat collector (5) and said heat transfer plate (4), said second heat transfer unit connecting said heat collector (5) to said heat transfer plate (4).


  2. The battery pack of claim 1, wherein said plurality of batteries (1) is a plurality of secondary batteries.
  3. The battery pack of claim 1, further comprising:

a first heat transfer unit (6) disposed between said heat collector (5) and said heat radiator (3).


  4. The battery pack of any one of the preceding claims, wherein said heat radiator (3) has at least one function of (i) a function of heat transfer plate for transferring the heat collected in said heat collector (5) to other position, and (ii) a function of cooling plate for releasing the heat collected in said heat collector (5) to the outside.
  5. The battery pack of any one of the preceding claims, wherein each battery of said plurality of batteries (1) has a cylindrical shape.
  6. The battery pack of any one of the preceding claims, wherein each battery of said plurality of batteries (1) is connected at least one of in series and in parallel.
  7. The battery pack of any one of the preceding claims wherein said heat collector (5) is made of at least one material selected from the group consisting of aluminium, copper, and heat conductive high polymer.
  8. The battery pack of any one of the preceding claims, wherein said first heat transfer unit (6) has a heat pipe, and/or said second heat transfer unit (7) has a heat pipe.
  9. The battery pack of any one of the preceding claims wherein said heat radiator (3) has a heat sink.
  10. The battery pack of claim 9, wherein said heat sink is made of at least one material selected from the group consisting of aluminium, copper, and heat conductive high polymer.
  11. The battery pack of any one of the preceding claims, wherein each battery of said plurality of batteries (1) has a cylindrical shape, and
said plurality of batteries (1) is disposed at least at the upper and lower position of the middle of the batteries (1) placed adjacently to each other.
  12. The battery pack of any one of the preceding claims, wherein said heat radiator (3) has a fin-type shape.