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Power storage system and cell protection method which protects the cell by both cutting from the cell pack and the cell pack from the system

  • US 9,831,691 B2
  • Filed: 08/07/2013
  • Issued: 11/28/2017
  • Est. Priority Date: 09/18/2012
  • Status: Active Grant
First Claim
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1. A power storage system provided with a secondary cell pack and further including a system protection unit having a system protection function that cuts the electrical connection between said secondary cell pack and the outside of said power storage system;

  • wherein;

    said secondary cell pack comprises a secondary cell and a cell protection unit having a cell protection function that cuts the electrical connection between said secondary cell and the outside of said secondary cell pack;

    said cell protection unit monitors a state value that indicates the state of said secondary cell and controls execution of said system protection function and said cell protection function based on said state value;

    said cell protection unit executes said system protection function or said cell protection function based on said state value when said state value diverges from a normal range that has been determined in advance;

    when said state value diverges from said normal range, said cell protection unit executes said system protection function or said cell protection function based on change of said state value when said state value is within a warning range that is adjacent to said normal range, and executes said cell protection function when said state value is within a cell halt range that is adjacent to said warning range and is not within said normal range; and

    when said state value is within said warning range, said cell protection unit predicts a halt postponement time that extends until protection of said secondary cell becomes necessary based on change of said state value, executes said system protection function when said halt postponement time is longer than a system halt delay time that was determined in advance, and executes said cell protection function when said halt postponement time is equal to or less than said system halt delay time.

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