BATTERY MONITORING IN ELECTRIC VEHICLES, HYBRID ELECTRIC VEHICLES AND OTHER APPLICATIONS
First Claim
1. A method of monitoring the condition of at least one cell of a battery connected to a power converter to supply electrical power to an electrical load, the method includingthe steps of:
- a) controlling the power converter to vary the input impedance of the power converter so as to draw a varying current from the at least one cell;
b) sensing the voltage across the at least one cell and the current drawn therefrom in response to varying the impedance of the power converter;
c) calculating from the sensed voltage and current the complex impedance of the at least one cell; and
d) comparing the calculated complex impedance with information indicative of a correlation between (i) the complex impedance and (ii) information indicative of the condition of the at least one cell, to give an indication of the condition of the at least one cell.
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Accused Products
Abstract
A method for monitoring the condition of at least one cell of a battery, used in an electric or hybrid electric vehicle. The battery is connected to a power converter to supply electrical power to an electrical load. The method includes the steps of: controlling the power converter to vary the input impedance of the power converter to draw a varying current from the cell; sensing the voltage across the cell and the current drawn in response to varying the impedance of the power converter; calculating from the sensed voltage and current the complex impedance of the cell; and comparing the calculated complex impedance with information indicative of a correlation between (i) the complex impedance and (ii) information indicative of the condition of the cell, to give an indication of the condition of the cell. The varying current may be actively varied or passively varied.
59 Citations
22 Claims
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1. A method of monitoring the condition of at least one cell of a battery connected to a power converter to supply electrical power to an electrical load, the method including
the steps of: -
a) controlling the power converter to vary the input impedance of the power converter so as to draw a varying current from the at least one cell; b) sensing the voltage across the at least one cell and the current drawn therefrom in response to varying the impedance of the power converter; c) calculating from the sensed voltage and current the complex impedance of the at least one cell; and d) comparing the calculated complex impedance with information indicative of a correlation between (i) the complex impedance and (ii) information indicative of the condition of the at least one cell, to give an indication of the condition of the at least one cell. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification