Parallel Battery Recalibration Without Power Interruption
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Solution Overview
Problem
Existing recalibration methods for large-capacity storage battery groups require complete discharge, which is time-consuming and impractical, especially during power outages or when power is being consumed, as they necessitate a prolonged period to correct capacity values, disrupting power supply.
Innovation Solution
A power storage unit with multiple storage batteries connected in parallel via a charge and discharge path and controlled by switches, allowing selective connection and disconnection of batteries for recalibration, enabling partial discharge and charge to correct capacity values without interrupting power supply to other batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complete discharge is performed for recalibration of large-capacity storage battery groups, then capacity values can be corrected accurately, but the time required for recalibration becomes excessively long and power supply is interrupted
Solution Approach 1:
The storage battery group is divided into multiple individual storage batteries, and recalibration is performed on a subset of batteries rather than the entire group. The control unit selectively discharges only the necessary portion of batteries to the discharge termination voltage, allowing capacity correction while maintaining power supply from other batteries in the group.
2Measurement precision
If complete discharge is performed for recalibration, then capacity values can be corrected, but power supply to the load is interrupted during the process
Solution Approach 1:
The storage battery group is segmented into multiple batteries with individual switches. During recalibration, only the necessary subset of batteries is discharged to correction voltage while other batteries remain connected to the load, ensuring continuous power supply. The control unit manages switch states to maintain load connectivity throughout the recalibration process.
3Quantity of substance
If large-capacity storage battery groups are used to store power for renewable energy and nighttime use, then power storage capacity is sufficient, but recalibration becomes impractical when power is being consumed
Solution Approach 1:
The large-capacity storage battery group is divided into multiple smaller battery units that can be independently controlled. The control unit identifies and discharges only the necessary subset of batteries for recalibration while maintaining operation of the remaining batteries. This segmentation enables recalibration to proceed during normal power consumption without requiring complete system shutdown or extended downtime.
Data Source
AI summary
A power storage unit is provided which is able to facilitate recalibration and which is able to supply power even while recalibration is being performed. A method for correcting the capacity values of storage batteries, and a power storage system are also provided. In the power storage unit, a control unit turns ON a portion of the switches to connect a portion of the storage batteries to the charge and discharge path for correction, and corrects the capacity value of the portion of storage batteries by charging and discharging the portion while the other switches are turned OFF to disconnect the other storage batteries from the charge and discharge path.