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Protection device for assembled cell providing equal consumption current for each battery module, and battery pack unit

  • US 8,212,523 B2
  • Filed: 03/18/2008
  • Issued: 07/03/2012
  • Est. Priority Date: 03/28/2007
  • Status: Expired due to Fees
First Claim
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1. A protection device for an assembled cell including a plurality of battery modules connected in series, each of which includes a plurality of secondary batteries connected in series, the protection device comprising:

  • a plurality of protection units provided corresponding one-to-one to a respective one of the battery modules, each of which is connected to a corresponding one of the battery modules through a power supply line including a current detection resistor so as to be fed with a supply current from the corresponding one of the battery modules, wherein each of the protection units is driven by the supply current; and

    a management unit connected to the protection units in common, wherein each protection unit includes;

    a voltage measurement unit configured to measure a voltage of the corresponding one of the battery modules;

    a consumption current measuring unit configured to measure the supply current passing through the detection resistor, wherein the supply current is measured as a consumption current consumed in the corresponding one of the battery modules to obtain measurement data;

    a communication unit which transmits the measurement data to the management unit and receives setting data from the management unit;

    a discharging unit which discharges the corresponding battery module to produce a discharge current flowing through the discharge unit; and

    a control unit configured to control the discharging unit to adjust the discharge current based on the measurement data and the setting data such that a sum total of the consumption current and the discharge current in the protection unit is substantially same as that in the other of the protection units.

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