Battery Balance Correction Apparatus Voltage Equalization
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Solution Overview
Problem
Existing balance correction circuits for electric storage systems struggle to effectively equalize voltages between electric storage cells in series, leading to inefficient use of capacity and unnecessary electric charge transfers due to variations in State Of Charge (SOC) and voltage differences, which increases costs and power consumption.
Innovation Solution
A balance correction apparatus comprising multiple balance correction sections and a control section that generates control signals based on precise voltage and SOC measurements to equalize voltages and manage operations, ensuring efficient charge transfer and reducing unnecessary equalization operations by comparing averaged SOC values across the cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple balance correction circuits are used to equalize voltages between electric storage cells, then voltage equalization effectiveness is improved, but device complexity and cost increase
Solution Approach 1:
The balance correction apparatus is divided into multiple independent balance correction sections (first balance correction section, second balance correction section, etc.), each responsible for equalizing voltages between specific electric storage cells. This segmentation allows the system to effectively handle voltage variations across multiple cells while keeping each individual section relatively simple in structure.
Solution Approach 2:
Each balance correction section is designed with universal functionality to equalize voltages between any two electric storage cells connected in series. The control section generates control signals that can be applied to different balance correction sections based on real-time voltage measurements, making the system adaptable to various voltage imbalance scenarios without requiring entirely different circuit designs.
2Reliability
If balance correction circuits operate continuously to equalize voltages, then voltage equalization is maintained, but power consumption increases
Solution Approach 1:
The control section periodically measures the voltages of electric storage cells and generates control signals only when voltage differences exceed a predetermined threshold. This periodic measurement and conditional activation approach ensures that balance correction operations are performed only when necessary, maintaining voltage equalization while minimizing unnecessary power consumption from continuous operations.
Solution Approach 2:
The control section continuously monitors voltage levels of electric storage cells and uses this feedback information to generate appropriate control signals for the balance correction sections. When voltage differences are within acceptable ranges, no correction is applied; when differences exceed thresholds, targeted correction is initiated. This feedback mechanism ensures efficient power usage by activating balance correction only when voltage imbalance is detected.
3Measurement precision
If balance correction operations are performed based on voltage measurements alone, then voltage equalization is achieved, but measurement precision and SOC-based control are compromised
Solution Approach 1:
The control section applies different control strategies to different balance correction sections based on local conditions of specific electric storage cells. By measuring voltages of individual cells and comparing them against predetermined thresholds, the system generates targeted control signals for specific cell pairs that require equalization, rather than applying uniform control across all cells. This localized approach improves measurement effectiveness while managing system complexity.
Data Source
AI summary
It is preferable to measure a voltage difference between two electric storage cells with a higher precision while suppressing costs of a balance correction circuit. A balance correction apparatus comprises a first balance correction section which equalizes voltages of two electric storage cells among a plurality of electric storage cells connected in series, a second balance correction section which equalizes voltages of two electric storage cells among the plurality of electric storage cells and a control section which controls operations of the first balance correction section and the second balance correction section. The control section generates a first control signal which controls operations of the first balance correction section and a second control signal which controls operations of the second balance correction section based on a measurement result of each voltage of the plurality of electric storage cells.