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Secondary battery control circuit

  • US 7,502,700 B2
  • Filed: 02/10/2004
  • Issued: 03/10/2009
  • Est. Priority Date: 03/16/1999
  • Status: Expired due to Fees
First Claim
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1. A secondary battery control unit, comprising:

  • a liquid detection section for continuously detecting infiltration or generation of a liquid inside a secondary battery or inside a battery pack in which the secondary battery is installed; and

    a control section for interrupting charging/discharging of the secondary battery in a case where a liquid is detected by the liquid detection section,wherein the liquid detection section controls the control section based on an impedance or resistance value detected between two electrically separated terminals, and wherein an amount of an electrical current flowing through each of the terminals approaches zero, unless the liquid is detected by the liquid detection section, andwherein the liquid detection section includes a comparator having a first input connected to a constant current source and one of the terminals, and a second input connected to a reference voltage source.

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