| 摘要 |
PURPOSE: Provided is a secondary battery pack, which reduces volume or increases charge capacity of a secondary battery by increasing size of the secondary battery as much as the volume is reduced. CONSTITUTION: The secondary battery pack contains the secondary battery(10), a protection circuit part formed on a circuit board(50), a secondary safety device(30), a cell phone connecting terminal, and a housing containing the protection circuit part, the secondary battery(10), and the secondary safety device(30), wherein the secondary safety device(30) is attached to the circuit board(50) or is printed on the circuit board or is formed on one layer of the circuit board comprising a plurality of layers.
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