Battery Cell Balancing Capacity Update for Faster Voltage Equalization
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Solution Overview
Problem
Conventional cell balancing methods in battery modules are limited by short balancing times, slow speeds, and erroneous balancing, leading to rapid capacity fading, increased internal resistance, and reduced power utilization due to inconsistent cell voltages.
Innovation Solution
A cell balancing device and method that determines balancing capacity based on charge capacity during charging, using a processing unit to identify target cells and update balancing capacities, allowing balancing beyond the end of charging stages, and performing balancing operations in various states (charging, discharging, or static standing) to improve consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If conventional cell balancing is activated only at the end of charging stage or static standing stage, then the balancing operation can be performed, but the balancing time is limited and balancing speed is slow
Solution Approach 1:
The patent makes the balancing operation dynamic by enabling it during charging, discharging, and static standing stages rather than restricting it to static conditions. The balancing activation condition is dynamically evaluated based on real-time voltage differences between cells, allowing the system to adaptively perform balancing operations across different operational states, thereby extending balancing time and improving balancing speed simultaneously
Solution Approach 2:
The patent implements continuous balancing capability across multiple operational stages (charging, discharging, static standing). By evaluating balancing conditions continuously and performing balancing operations during active charging/discharging phases when voltage differences exceed thresholds, the system eliminates idle balancing time and maintains continuous useful balancing action, thereby extending overall balancing time and improving effective balancing speed
2Device complexity
If instantaneous voltage difference is used as the basis for determining balancing activation, then the control is simple, but erroneous balancing occurs and balancing accuracy is reduced
Solution Approach 1:
The patent implements feedback mechanisms by continuously monitoring cell voltages during charging, discharging, and static standing stages. The balancing activation decision is based on feedback from real-time voltage difference measurements between maximum and minimum voltage cells. This feedback loop ensures that balancing is activated only when genuinely needed (when voltage inconsistency exceeds threshold) and deactivated when cells are sufficiently balanced, thereby eliminating erroneous balancing while maintaining practical control complexity
Solution Approach 2:
The patent performs preliminary evaluation of balancing conditions before activating balancing operations. By checking whether voltage differences between cells exceed predefined thresholds during charging, discharging, or static standing stages, the system determines in advance whether balancing is truly required. This preliminary action prevents erroneous balancing activation while maintaining simple control logic, thereby improving balancing accuracy without significantly increasing control complexity
3Device complexity
If balancing is performed based on voltage difference threshold at end of charging or static standing stage, then the control logic is simple, but balancing speed is slow and capacity utilization is reduced
Solution Approach 1:
The patent dynamically adapts the balancing control logic to different operational stages (charging, discharging, static standing). Instead of using a single static control approach, the system evaluates balancing conditions differently for each stage, activating balancing during charging when voltage differences are significant and when it would be wasteful to stop charging. This dynamic control logic remains relatively simple while dramatically improving capacity utilization by enabling balancing during productive charging phases
Solution Approach 2:
The patent changes the control parameters based on operational stage. Different voltage difference thresholds and activation conditions are applied during charging, discharging, and static standing stages. This parameter adaptation allows the system to optimize balancing performance for each operational context, improving overall capacity utilization while maintaining manageable control logic complexity through stage-specific parameter sets
Data Source
AI summary
A cell balancing device and method includes: obtaining a first minimum cell voltage value and a first maximum cell voltage value of a to-be-balanced battery module in a latest full-charging operation; determining a first charge capacity of a first target cell in the battery module in a corresponding first time period in response to a first charging operation by the battery module; and updating a balancing capacity of the first target cell based on the first charge capacity. The first target cell has a voltage value greater than or equal to the first minimum cell voltage value. The first time period corresponding to the first target cell is a period of time that begins when the voltage value of the first target cell reaches the first minimum cell voltage value for a first time and that ends when the first charging operation of the battery module is ended.