METHOD FOR CORRECTING VOLTAGE SENSOR INCLUDED IN BATTERY RACK
First Claim
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1. An energy storage device comprising:
- first to Nth battery racks, each including a plurality of secondary battery cells electrically connected in series, the first to Nth battery racks being electrically connected to each other in parallel;
first to Nth relay switches electrically connected in series to a high potential terminal or a low potential terminal of each battery rack, and designed to turn on or off in response to a control signal;
first to Nth rack voltage sensors electrically connected to each battery rack and each relay switch in parallel, and configured to output a measured voltage value as a signal; and
a rack control unit configured to output a signal to control the turn-on or turn-off of the first to Nth relay switches, and to receive the signals for the voltage values of the first to Nth battery racks from the first to Nth rack voltage sensors,wherein the rack control unit outputs a control signal to turn on only a relay switch electrically connected to any one battery rack (hereinafter referred to as a target rack) among the first to Nth battery racks, and calibrates a signal for a voltage value outputted from a voltage sensor electrically connected to the target rack based on a sum of voltage values of secondary battery cells included in the target rack.
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Abstract
The present invention discloses a method for correcting a voltage sensor. Because a plurality of battery racks are electrically connected to a power storage apparatus in parallel, a voltage sensor connected to each of the battery racks can be influenced by the voltage of other adjacent battery racks when measuring the voltage of each of the battery racks. Therefore, after electrically connecting only one battery rack to the voltage sensor, the voltage value measured by the corresponding voltage sensor is corrected.
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Citations
10 Claims
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1. An energy storage device comprising:
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first to Nth battery racks, each including a plurality of secondary battery cells electrically connected in series, the first to Nth battery racks being electrically connected to each other in parallel; first to Nth relay switches electrically connected in series to a high potential terminal or a low potential terminal of each battery rack, and designed to turn on or off in response to a control signal; first to Nth rack voltage sensors electrically connected to each battery rack and each relay switch in parallel, and configured to output a measured voltage value as a signal; and a rack control unit configured to output a signal to control the turn-on or turn-off of the first to Nth relay switches, and to receive the signals for the voltage values of the first to Nth battery racks from the first to Nth rack voltage sensors, wherein the rack control unit outputs a control signal to turn on only a relay switch electrically connected to any one battery rack (hereinafter referred to as a target rack) among the first to Nth battery racks, and calibrates a signal for a voltage value outputted from a voltage sensor electrically connected to the target rack based on a sum of voltage values of secondary battery cells included in the target rack. - View Dependent Claims (2, 3, 4, 5)
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6. A method for calibrating a rack voltage sensor of an energy storage device, the energy storage device comprising first to Nth battery racks including a plurality of secondary battery cells electrically connected in series, first to Nth relay switches electrically connected in series to a high potential terminal or a low potential terminal of each battery rack, and designed to turn on or off in response to a control signal, first to Nth rack voltage sensors electrically connected to each battery rack and each relay switch in parallel, and configured to output a measured voltage value as a signal, and a rack control unit configured to output a signal to control the turn-on or turn-off of the first to Nth relay switches, and to receive the signals for the voltage values of the first to Nth battery racks from the first to Nth rack voltage sensors,
the method comprising: -
(a) outputting, by the rack control unit, a control signal to turn on only a relay switch electrically connected to any one battery rack (hereinafter referred to as a target rack) among the first to Nth battery racks; and (b) calibrating, by the rack control unit, a signal for a voltage value outputted from a voltage sensor electrically connected to the target rack based on a sum of voltage values of secondary battery cells included in the target rack. - View Dependent Claims (7, 8, 9, 10)
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Specification