Battery Charging Control for Balanced Parallel Switching
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Solution Overview
Problem
In battery systems where multiple batteries are connected in series and parallel, voltage differences during charging can lead to circulating currents when switching between charging and discharging modes, causing issues with parallel operation and potential damage to components.
Innovation Solution
A charging control device that individually charges each storage battery system to a common total voltage and uniform remaining charge capacity, using system switches and bypass switches to manage the charging process, ensuring equal total voltages and capacities before collective charging, thereby minimizing circulating currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If batteries are bypassed during charging progress, then charging flexibility is improved, but total voltage decreases causing circulating current
Solution Approach 1:
The control device performs preliminary balancing of remaining charge capacities across all batteries before charging begins. By pre-adjusting the state of charge of each battery to be substantially equal, the system eliminates voltage differences that would otherwise cause circulating currents when batteries are bypassed during charging.
2Measurement precision
If individual charging is performed for each storage battery system, then charging control precision is improved, but voltage difference occurs between systems
Solution Approach 1:
The control device continuously monitors the remaining charge capacity of each battery and adjusts charging current in real-time. By implementing feedback control that equalizes the state of charge across all batteries during individual charging, the system maintains voltage consistency between parallel-connected storage battery systems and prevents circulating currents.
3Power
If parallel operation is performed with different total voltages, then system output is improved, but circulating current flows between systems
Solution Approach 1:
The control device ensures that all batteries in parallel-connected storage battery systems are maintained at substantially the same remaining charge capacity and voltage level. By creating equipotential conditions across all systems before and during parallel operation, the invention eliminates potential differences that would otherwise drive harmful circulating currents while allowing the systems to deliver combined power output.
Data Source
AI summary
A charging control device is to charge a battery device including a battery group including storage battery systems, in which batteries are connected in series, connected in parallel, system switches and bypass switches. The charging control device includes a control device to control the system switches and the bypass switches to control charging of the battery device. The control device determines an individual charging completion total voltage, obtains system remaining charge predetermined capacities for each of total voltages of the storage battery systems to reach the individual charging completion total voltage, charge the battery systems individually such that each of the total voltages of the first and second storage battery systems reaches the individual charging completion total voltage while making remaining charge capacities of batteries uniform to be the system remaining charge predetermined capacities and perform collective charging of the storage battery systems after individually charging storage battery systems.