Battery Balancing Module Adaptive Threshold Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Battery balancers face challenges in accurately detecting and correcting unbalanced conditions in battery cells due to flat voltage regions during charging, where cell voltages do not accurately reflect capacity variations, leading to inaccurate balancing operations.
Innovation Solution
A battery system with a balancing module that specifies voltage thresholds based on the charging current, initiating a balance check when cell voltages exceed or fall below these thresholds, ensuring accurate balancing by operating outside the flat voltage region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If battery balancing is performed during flat voltage region, then balancing operation can be executed, but voltage monitoring cannot accurately detect capacity variations leading to inaccurate balancing control
Solution Approach 1:
The patent applies dynamics by making the balancing control strategy adaptive to the charging state. The system dynamically switches between voltage-based control (when dV/dt > threshold) and time-based control (when dV/dt ≤ threshold), allowing the balancing operation to execute during flat voltage regions while maintaining accuracy through appropriate method selection.
Solution Approach 2:
The patent changes the control parameter from voltage-only to a combination of voltage and time parameters. During flat voltage regions where voltage monitoring becomes unreliable, the system transitions to using time as the primary control parameter, thereby maintaining balancing accuracy despite voltage plateau conditions.
2Ease of operation
If voltage threshold is used for balance check, then balancing control can be implemented, but control accuracy deteriorates in flat voltage region where voltage does not reflect capacity variation
Solution Approach 1:
The system dynamically adjusts the control methodology based on the real-time charging state. When the voltage changes rapidly (dV/dt > threshold), voltage-based control is used for ease of operation. When voltage plateaus (dV/dt ≤ threshold), the system switches to time-based control, maintaining both ease of operation and accuracy adaptively.
Solution Approach 2:
The patent introduces the derivative dV/dt as an intermediary parameter to determine the appropriate control method. This intermediary enables the system to select between voltage-based and time-based control strategies, ensuring accurate capacity detection while maintaining ease of operation across different charging conditions.
3Speed
If constant current charging is applied, then charging speed is maintained, but voltage plateau region causes loss of capacity information for balancing detection
Solution Approach 1:
The system maintains constant current charging for speed while dynamically switching control methods to preserve capacity information. During flat voltage regions, the system transitions from voltage-based to time-based control, allowing continuous accurate balancing detection without reducing charging speed.
Solution Approach 2:
The patent changes the detection parameter from voltage to time during flat voltage regions. This parameter substitution allows the system to continue monitoring capacity variations accurately even when voltage information is lost due to the plateau effect during constant current charging.
Data Source
AI summary
A battery system includes multiple battery cells having multiple cell voltages, and a balancing module. The battery module coupled to multiple battery cells and configured to specify a first voltage threshold according to an amount of a charging current supplied to the battery cells in constant current charging mode, and to initiate a balance check of the battery cells if the first voltage threshold is not satisfied by a cell voltage of the plurality of cell voltages.