Patent ID: 8294426
Filing Date: 2012-10-23
Classification: B60L,G01R,Y02T

Abstract:
1. A secondary battery device comprising: a first assembled battery including a plurality of secondary battery cells; a second assembled battery including a plurality of secondary battery cells and connected in series to a low-potential terminal of the first assembled battery; a disconnecting module capable of mechanically switching connection between the first assembled battery and the second assembled battery; a voltage measurement circuit configured to measure voltages of said plurality of secondary battery cells of the second assembled battery; a first wiring connected between a high-potential terminal of the second assembled battery and the voltage measurement circuit; a second wiring connected between a low-potential terminal of the second assembled battery and the voltage measurement circuit; and a filter connected between the first wiring and the second wiring and including a first filter and a second filter connected in parallel between the voltage measurement circuit and the second assembled battery, wherein the second filter is configured to attenuate a signal of frequencies greater than a cutoff frequency, the cutoff frequency is set to be smaller than a peak frequency of the secondary battery cells, and an impedance of the secondary battery cell takes on a maximum value when the frequency is the peak frequency.