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Method and apparatus for determining a constant current limit value

  • US 10,067,193 B2
  • Filed: 07/26/2016
  • Issued: 09/04/2018
  • Est. Priority Date: 07/27/2015
  • Status: Active Grant
First Claim
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1. A method for determining a constant current limit value (GIB) by means of which a first current (IB0) which flows through a battery cell is limited, wherein the constant current limit value (GIB) is determined on the basis of a first function which specifies a first profile of the first current (IB0), which first profile is calculated depending on a plurality of parameters, wherein the plurality of parameters include a first voltage (UB1) which is applied between two terminals (3, 4) of the battery cell, a second voltage (UB2) which specifies a no-load voltage (UB2) of the battery cell, and a time variable which specifies a variable prediction period, the method comprising:

  • measuring, with a current sensor, a current value (IB01) of the first current (IB0),measuring, with a voltage sensor, a voltage value of the first voltage (UB1),determining, with a controller that receives the current value (IB01) from the sensor, an actual correction voltage value depending on the measured current value (IB01) of the first current (IB0) and on the measured voltage value of the first voltage (UB1),determining, with the controller, the constant current limit value (GIB) by means of a predefined function (IB) which is given by replacing the second voltage (UB2) with a correction voltage, which is dependent on the second voltage (UB2) and the actual correction voltage value, in the first function,limiting, by the controller, the first current (IB0) according to the constant current limit value (GIB)determining a changed preliminary correction voltage value (KUB21), andsetting, with the controller, the actual correction voltage value equal to the changed preliminary correction voltage value (KUB21).

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