Battery Voltage Correction via Cross-Unit Sensor Feedback
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Solution Overview
Problem
Conventional storage battery systems fail to properly control the charge and discharge of battery packs when voltage sensors fail or experience high detection errors due to aging, leading to uneven distribution of charge and discharge, which can shorten battery life.
Innovation Solution
The system includes electric storage units connected in parallel with voltage conversion units equipped with voltage sensors, communication units, and control units that communicate with other voltage conversion units to detect and correct voltage values, ensuring proper charge and discharge control by approximating detected voltage values to a target value when differences exceed predetermined thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage sensors are used to detect voltage values for controlling charge and discharge, then charge and discharge control can be implemented, but the system becomes vulnerable to sensor failures and detection errors
Solution Approach 1:
The system implements feedback by having each voltage conversion unit obtain voltage values from other units via communication units. The control unit compares the detected voltage value with obtained voltage values and adjusts accordingly, creating a closed-loop feedback mechanism that compensates for sensor errors and failures
Solution Approach 2:
The communication unit acts as an intermediary, allowing voltage conversion units to share voltage measurement data. This intermediary mechanism enables cross-validation of voltage readings and provides alternative data sources when primary sensors fail or produce erroneous readings
2Duration of action of stationary object
If voltage values are not properly controlled when sensors fail, then the system structure remains simple, but uneven charge and discharge distribution occurs shortening battery life
Solution Approach 1:
Each voltage conversion unit independently performs voltage value verification and correction using data from other units. The system is self-regulating, with each unit capable of detecting and correcting its own voltage measurement issues without external intervention, thereby extending battery life through autonomous error correction
Solution Approach 2:
The system merges voltage detection functions across multiple units, where each unit not only detects its own voltage but also obtains and utilizes voltage data from other units. This combined approach distributes the measurement burden and provides redundancy, protecting battery life without requiring a completely separate monitoring system
Data Source
AI summary
A storage battery system includes: electric storage units; and DC-DC converters each provided between one of the electric storage units and a DC bus. Each of the DC-DC converters includes: a voltage sensor for detecting a voltage value at a connection point between the DC bus and the DC-DC converter; a second obtainment unit which obtains voltage values detected by the voltage sensors of the other DC-DC converters; and a control unit which, when a difference value between a statistic of the voltage values obtained by the second obtainment unit and the voltage value detected by the voltage sensor is not less than a predetermined threshold value, changes the voltage value detected by the voltage sensor, and controls an amount of charge in and an amount of discharge from a corresponding one of the electric storage units to approximate the changed voltage value to a predetermined target value.