Device for Improving the Charging or Discharging Process of a Battery
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Abstract
A device for balancing a plurality of at least two batteries or cells of a multicell battery comprises a multicell battery and a battery management system with a balancing circuit. Thereby all individual battery cells are connected to the battery monitoring system, wherein the battery monitoring system measures single cell voltage as well as the battery temperature and the current. The battery monitoring system is able to discern the lowest cell voltage and to discern a number of cells having a voltage higher than a determined maximum allowable voltage, which will be balanced until the charge imbalance decreases to an acceptable amount. The battery management system is active during charging and discharging of the multicell battery and the thresholds vary with the state of the battery.
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Citations
19 Claims
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1-8. -8. (canceled)
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9. :
- A device for balancing a plurality of at least two cells of a multicell battery comprising;
a battery monitoring system having a balancing circuit; and a multicell battery having individual battery cells, wherein all individual battery cells are connected to the battery monitoring system, wherein the battery monitoring system measures every single cell voltage and discerns at least one cell having one of a lowest cell voltage and a voltage below a determined lower threshold voltage and discerns a number of cells having a voltage higher than a determined maximum allowable voltage, and wherein the battery monitoring system generates a control signal for the balancing circuit to allow balancing of the cells if a voltage difference between the cell having the lowest cell voltage and the cells having a voltage higher than the determined maximum allowable voltage is greater than a predetermined threshold. - View Dependent Claims (10, 11, 12, 13, 14, 15)
- A device for balancing a plurality of at least two cells of a multicell battery comprising;
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16. :
- A device for balancing a plurality of at least three cells of a multicell battery comprising;
a multicell battery; a battery monitoring system; and an internal resistance measurement unit for providing an internal resistance measurement comprising two units for difference calculation, a unit for resistance calculation and a unit for a small signal compensation, wherein the two units for difference calculation create a difference signal of voltage and current, respectively, wherein the two units for difference calculation are connected to the unit for resistance calculation, the output of the unit for resistance calculation is provided to the unit for signal compensation discarding results that were received from the unit for resistance calculation at small currents, and wherein the internal resistance measurement is conducted during operation time of the multicell battery. - View Dependent Claims (17, 18, 19)
- A device for balancing a plurality of at least three cells of a multicell battery comprising;
Specification