Dynamic Charge Control for Battery Cell Voltage Balancing
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Solution Overview
Problem
Series-connected battery cells often become unbalanced due to differences in power capacity and maximum voltage, leading to inefficient charging, where cells with higher voltage risk overcharging while those with lower voltage do not become fully charged, reducing the overall runtime of devices.
Innovation Solution
A charging device with conductive lines, a charge control circuit, and switches to balance voltages among battery cells, which determines cell voltages and suspends charging to ensure all cells reach a balanced state, preventing overcharging and ensuring full charge capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If battery cells are charged in series without voltage balancing, then charging speed is improved, but voltage imbalance causes overcharging of high-voltage cells and undercharging of low-voltage cells
Solution Approach 1:
The charge control circuit dynamically adjusts charging parameters based on real-time voltage measurements of individual cells. The system transitions between different charging stages (first stage with continuous charging and voltage determination, second stage with charging suspension and voltage determination) to maintain cell voltage balance while optimizing charging speed and preventing overcharging
Solution Approach 2:
The system implements feedback control by continuously measuring cell voltages during charging and using this information to control the charging process. The charge control circuit determines voltages of battery cells and uses this feedback to suspend or resume charging, ensuring all cells reach balanced voltage states without overcharging
2Stability of the object's composition
If voltage balancing is implemented by suspending charging to determine cell voltages, then cell voltage balance is improved, but charging time increases
Solution Approach 1:
The charging process is divided into periodic stages: a first stage where charging continues while voltages are determined, and a second stage where charging is suspended for voltage determination. This periodic alternation allows the system to achieve voltage balance while minimizing interruptions to the overall charging process
Data Source
AI summary
A device for charging battery cells has conductive lines to be coupled to the battery cells, a charge control circuit coupled to the conductive lines to charge the battery cells, and to determine voltages of the battery cells, and switches to balance the voltages among the battery cells. In operation, the charge control circuit charges the battery cells while determining the voltages of the battery cells, and suspends from charging the battery cells before determining the voltages of the battery cells in a second stage.