Parallel Battery Pack Charging Control for Voltage Imbalance
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Solution Overview
Problem
Parallel battery packs face unrecoverable faults and excessive current impacts due to small internal resistance and voltage differences during charging, leading to unstable operation and potential component damage.
Innovation Solution
A management method for parallel battery packs that involves real-time data collection and sequential control of charging and disconnection based on voltage levels, maintaining safe charging currents, and limiting power output to prevent faults and balance voltage differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple parallel battery packs are charged in parallel, then the charging speed and current output are improved, but unrecoverable faults and component damage may occur due to small internal resistance
Solution Approach 1:
The system performs preliminary detection of voltage differences between parallel battery packs before charging begins. If the voltage difference exceeds a preset threshold, the system pre-adjusts by controlling the charging current distribution or disconnecting problematic packs, preventing faults before they occur during the charging process
Solution Approach 2:
The system continuously monitors voltage, current, and temperature parameters of each parallel battery pack during charging. Based on real-time feedback, the control unit dynamically adjusts charging strategies for individual packs, reducing circulating currents and preventing component damage while maintaining high charging speed
2Quantity of substance
If parallel battery packs with voltage differences are connected, then the system capacity is improved, but excessive circulating current is generated between the battery packs
Solution Approach 1:
The system applies different charging control strategies to different battery packs based on their individual voltage levels and states. Each pack receives customized current control rather than uniform treatment, allowing the system to accommodate voltage differences while minimizing harmful circulating currents between packs
Solution Approach 2:
The system dynamically changes charging parameters (current magnitude, voltage thresholds) based on the voltage differences detected between parallel packs. By adjusting these parameters in real-time, the system maintains high overall capacity while controlling circulating current within safe limits
Data Source
AI summary
A management method for a battery system having parallel battery packs includes a charging control operation of sequentially closing battery packs having a low voltage value level and completing a charging of the battery packs. The purpose of the present invention is to provide a management method for a battery system having parallel battery packs which is applicable to multiple parallel battery packs being charged in parallel, to solve the technical problems that a safe and stable operation of the entire battery packs cannot be ensured caused by the failure of the battery packs, and excessive current impact may be generated due to an excessive voltage difference among the battery packs.