Method and device for monitoring and for dynamically balancing a storage battery pack
First Claim
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1. A method of monitoring the state of all individual batteries in a battery pack made up of a plurality of said individual batteries connected in series, said method comprising the steps of:
- monitoring voltage at terminals of each of said batteries and monitoring the temperature of each of said batteries;
tapping off at least a portion of charging current of individual ones of said batteries and dissipating said at least part of the charging current outside said ones of said batteries when at least one of a voltage at terminals of said ones of said batteries and the temperature of said ones of said batteries indicate a state of overcharge;
monitoring, during a charging and discharging mode, the rate of change of voltage at terminals of each of said batteries and monitoring the temperature of each of said batteries in order to detect imbalance between said plurality of batteries in said pack; and
when an imbalance is detected, providing at least one of a recording of said imbalance and a triggering of an alarm.
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Abstract
A method and device for monitoring and balancing individual batteries in a pack. The terminals of each battery, which are connected in series, is connected to an electronic monitoring and balancing device. Each of these electronic devices are ballasted for tapping off and dissipating part of the current of the corresponding battery if the characteristics of the battery are out of balance with respect to the others.
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Citations
17 Claims
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1. A method of monitoring the state of all individual batteries in a battery pack made up of a plurality of said individual batteries connected in series, said method comprising the steps of:
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monitoring voltage at terminals of each of said batteries and monitoring the temperature of each of said batteries; tapping off at least a portion of charging current of individual ones of said batteries and dissipating said at least part of the charging current outside said ones of said batteries when at least one of a voltage at terminals of said ones of said batteries and the temperature of said ones of said batteries indicate a state of overcharge; monitoring, during a charging and discharging mode, the rate of change of voltage at terminals of each of said batteries and monitoring the temperature of each of said batteries in order to detect imbalance between said plurality of batteries in said pack; and when an imbalance is detected, providing at least one of a recording of said imbalance and a triggering of an alarm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A device for monitoring the state of individual batteries in a battery pack containing a plurality of said individual batteries connected in series, said device comprising:
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a current sensor connected to the terminals of each one of said plurality of batteries, said current sensor being in series with an energy-dissipating ballast; a comparator having an input receiving a set voltage, said comparator being connected to said sensor and the output of said comparator controlling said ballast; a voltage measurement device for measuring the rate of change of voltage of each of said batteries; and a control device responding to an output of said voltage measurement device to determine a rate of change of voltage of each of said batteries and to output said set of voltage to said comparator wherein said set voltage is a function of said rate of change of voltage of said individual batteries. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification