CIRCUIT AND METHOD FOR EVALUATING CELLS IN A BATTERY
First Claim
1. A circuit, comprising:
- a balancing circuit, configured to inductively transfer charges between cells in a battery using current pulses, anda control unit configured to control the balancing circuit to provide the current pulses,wherein an average value of the current pulses oscillates over time.
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Abstract
In various embodiments, a method for evaluating a cell of a battery is provided. The method may include: balancing a voltage of at least one cell of the battery using charge pulses, wherein the charge pulses are modulated with an oscillating test signal; measuring a current flow through the cell and measuring a voltage across the cell; demodulating the measured current and the measured voltage; and determining an impedance based on the demodulated current and the demodulated voltage.
Further, in various embodiments, a circuit is provided, including a balancing circuit configured to inductively transfer charges between cells in a battery using current pulses, and a control unit configured to control the balancing circuit to provide the current pulses, wherein an average value of the current pulses oscillates over time.
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Citations
28 Claims
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1. A circuit, comprising:
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a balancing circuit, configured to inductively transfer charges between cells in a battery using current pulses, and a control unit configured to control the balancing circuit to provide the current pulses, wherein an average value of the current pulses oscillates over time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for evaluating cells of a battery, comprising:
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balancing a voltage of a cell using charge pulses, wherein the charge pulses are modulated with an oscillating test signal; measuring a current through the cell and measuring a voltage across the cell; demodulating the measured current and the measured voltage; and determining an impedance based on the demodulated current and the demodulated voltage. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A circuit, comprising:
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an active balancing circuit, configured to balance voltages of cells of a battery by inductively transferring charges between a respective cell and the battery using current pulses; a pulse generating unit, configured to generate the current pulses, wherein the current pulses are modulated with a given frequency; a measuring unit, configured to measure a voltage across the cell and a current flow through the cell; a demodulation unit, configured to determine a voltage and a current at the given frequency from the measured voltage across the cell and current flow through the cell; and a calculation unit, configured to calculate an impedance of the cell from the voltage and the current determined at the given frequency.
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Specification