NOVELTY - The protective circuit module comprises: a first printed circuit board having a first surface and a second surface, where the first surface is arranged opposite to the second surface; a second printed circuit board; an electronic device comprising an integrated circuit chip (IC) mounted on the first surface; electronic components electrically connected to the integrated circuit chip; and a pattern part mounted on the second surface. The pattern part comprises a ground pattern for grounding. The electronic components are connected to the pattern part through a conductive via.    USE - The protective circuit module is useful in a battery pack (claimed), where the battery such as lithium based secondary battery including lithium ion or lithium polymer secondary battery is useful as a power supply source for portable electronic device such as smartphone, mobile phone, notebook computer and electronic tool.    ADVANTAGE - The protective circuit module can protect the battery from over-charge, over-discharge or over-current, prevent battery performance from being lowered and minimize influences of externally induced electromagnetic waves and static electricity.    DETAILED DESCRIPTION - The protective circuit module comprises: a first printed circuit board having a first surface and a second surface, where the first surface is arranged opposite to the second surface; a second printed circuit board; an electronic device comprising an integrated circuit chip (IC) mounted on the first surface; electronic components electrically connected to the integrated circuit chip; and a pattern part mounted on the second surface. The pattern part comprises a ground pattern for grounding. The electronic components: are connected to the pattern part through a conductive via; and comprise a first capacitor connected between a power supply terminal of the integrated circuit chip and the pattern part. The electronic device further comprises: a connector including electrode pads to be connected to an external charging device; a second capacitor electrically connected between one of the electrode pads of the connector and the pattern part; and the electronic components. The electrode pads include positive or negative electrode pads. The first printed circuit board includes the integrated circuit chip. The second printed circuit board is arranged to be spaced apart from the first printed circuit board, and has the pattern part electrically connected to the electronic components. The integrated circuit chip and the electronic devices are arranged on the first surface. The electrode pads are arranged on the second surface. An INDEPENDENT CLAIM is included for a battery pack.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a circuit diagram of a protective circuit module.    Integrated circuit chip (IC)    First resistor (R1)    Second resistor (R2)    Discharge control switch (SW1)    Charge control switch. (SW2)