Battery Rack Voltage Sensor Calibration via Relay Segmentation
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Solution Overview
Problem
Voltage sensors in battery racks connected in parallel experience inaccuracies due to influence from adjacent racks, necessitating a method to calibrate them accurately without interference.
Innovation Solution
An energy storage device with relay switches and a rack control unit that sequentially isolates each battery rack, allowing the voltage sensor to calibrate based on the sum of voltage values from secondary battery cells connected in series, ensuring accurate measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage sensors in battery racks connected in parallel measure voltage simultaneously, then measurement can be performed continuously, but measurement accuracy deteriorates due to interference from adjacent racks
Solution Approach 1:
The patent divides the parallel battery rack system into individually isolated measurement segments. By sequentially isolating each battery rack during calibration using relay switches, the system ensures that voltage measurements for each rack are performed independently without interference from adjacent racks, thereby improving measurement accuracy.
Solution Approach 2:
The patent performs preliminary isolation of the target battery rack from parallel-connected racks before conducting voltage calibration. The control unit activates relay switches to disconnect the target rack from other racks in advance, creating an isolated measurement environment that eliminates interference effects before the actual voltage sensing and calibration process begins.
2Quantity of substance
If battery racks are connected in parallel to increase capacity, then energy storage capacity increases, but voltage sensor calibration accuracy decreases due to mutual influence between racks
Solution Approach 1:
The patent maintains the parallel connection of battery racks for increased energy storage capacity while implementing segmented calibration procedures. During calibration, the system temporarily isolates individual racks using relay switches, allowing accurate voltage sensor calibration for each rack without mutual interference, while preserving the overall parallel configuration for high capacity operation.
Solution Approach 2:
The control unit performs preliminary isolation of the target battery rack from parallel-connected racks before conducting voltage calibration. By activating relay switches to disconnect the target rack in advance, the system enables accurate calibration of voltage sensors while maintaining the parallel architecture for high energy storage capacity.
Data Source
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AI summary
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.