DC-DC Converter Control for Battery Cell Balancing
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Solution Overview
Problem
Existing battery management systems fail to efficiently regulate charging and discharging currents across lithium-ion battery cells due to manufacturing tolerances, leading to suboptimal performance, energy wastage, and reduced capacity utilization.
Innovation Solution
A control system comprising DC-DC converters and a processor-based cell balancing module that adjusts charging and discharging currents and duty cycles for each battery cell, using sensors to determine State of Charge and State of Power, enabling precise control and balancing through a switch matrix interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a battery balancing system is implemented to compensate for manufacturing differences in battery cells, then homogeneity of State of Charge across cells is improved, but energy efficiency deteriorates due to unregulated charging/discharging currents causing energy waste and capacity loss
Solution Approach 1:
The system dynamically adjusts charging and discharging current parameters for each battery cell based on real-time State of Charge measurements and cell-specific characteristics. The DC-to-DC converter modifies current magnitude and flow direction to achieve uniform SoC while maximizing energy utilization, preventing both overcharging energy waste and underutilization of battery capacity.
2Speed
If unregulated charging current is applied to battery cells with manufacturing tolerances, then charging speed is improved, but manufacturing precision deterioration leads to non-uniform State of Charge and reduced overall battery performance
Solution Approach 1:
The system applies localized control to each battery cell by individually measuring its State of Charge and adjusting the charging current specifically for that cell. The DC-to-DC converter delivers tailored current levels to each cell based on its unique characteristics and current charge state, ensuring uniform SoC distribution while maintaining high charging speed through parallel operation of multiple cells.
3Power
If unregulated discharging current is extracted from battery cells, then power output is improved, but capacity utilization deteriorates due to non-uniform discharge rates causing premature cell voltage imbalance
Solution Approach 1:
The system dynamically adjusts discharging current levels for each battery cell based on real-time voltage and charge state monitoring. The DC-to-DC converter continuously modifies discharge rates to maintain uniform cell performance, allowing the battery pack to deliver maximum power output while fully utilizing the capacity of all cells by preventing premature voltage imbalance during discharge.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution ensures optimal energy management and balancing of battery cells, enhancing efficiency, extending runtime, and increasing energy extraction capabilities compared to conventional systems.
Implementation Method 1
A first direct-current to direct-current (DC-to-DC) converter is configured to convert an input direct-current voltage to an output direct-current voltage with a regulated charging current
Data Source
AI summary
A first direct-current to direct-current (DC-to-DC) converter is configured to convert an input direct-current voltage to an output direct-current voltage with a regulated charging current consistent with a target charging current limit or range established by the current estimator for the charging mode and respective cell identifier(s) determined by a cell balancing module for the charging mode for the time interval. A first controller is capable of controlling the charging, individually or collectively, of each of the battery cells by adjusting/controlling the regulated charging current outputted by the first DC-DC converter and/or the duty cycle of switches of the first DC-to-DC converter based on the target charging current limit or range for the time interval.