| 摘要 |
It is shown a method and an arrangement for determining a temperature of a battery pack (100) connected via a single communication line (107) to an electric device (101). The battery pack (100) and electric device (101) both comprise control and signaling means (105, 108) capable of exchanging digita l signal sequences. The battery pack (100) comprises an impedance unit (112) having a temperature dependent impedance value. The method comprises steps o f signaling between the battery pack (100) and the device (101). This is followed by a sequence of steps where the control and signaling means (105) of the battery pack (100) is disconnected from the communication line (107) and the temperature dependent impedance unit (112) is connected to the communication line (107). Electric current is supplied to the impedance unit (112) via the communication line (107) and a voltage level is measured on th e communication line (107). Then an impedance value is calculated based on the supplied current level and the measured voltage level. An interpretation of the calculated impedance value as a temperature of the battery pack (100) is then performed, followed by disconnecting the temperature dependent impedanc e unit (112), and reconnecting the control and signaling means (105) of the battery pack, to the communication line (107). |
