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BATTERY MONITORING APPARATUS

  • US 20160061909A1
  • Filed: 09/01/2015
  • Published: 03/03/2016
  • Est. Priority Date: 09/01/2014
  • Status: Active Grant
First Claim
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1. A battery monitoring apparatus for a battery pack including a plurality of unit cells connected in series, comprising:

  • a plurality of wire sections each of which is connected to a node between a corresponding adjacent two of the unit cells at one end thereof, and branched into a first branch section and a second branch section at another end thereof, each of the first and second branch sections being constituted of a positive part connected to a positive electrode of a corresponding one of the unit cells and a negative part connected to a negative electrode of the corresponding one of the unit cells,for each of the wire sections, the positive part of the second branch section and the negative part of the first branch section constitute a first wire pair, and the positive part of the first branch section and the negative part of the second branch section constitute a second wire pair;

    an equalizing switch provided between each of the first wire pairs to short-circuit the first wire pair when being turned on;

    a first voltage detector provided in parallel to each of the equalizing switches to detect a voltage between a corresponding one of the first wire pair;

    an equalizing section which performs an equalizing process to equalize a terminal voltage of each unit cell by turning on a corresponding one of the equalizing switches depending on a result of voltage detection by the first voltage detector; and

    a second voltage detector provided between each of the second wire pairs for detecting the terminal voltage of a corresponding one of the unit cells when the equalizing switch is on and when the equalizing switch is off.

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