Battery Cell Priority Switching for Charge-Discharge Balancing
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Solution Overview
Problem
Existing battery systems face challenges in maintaining optimal cell operation by balancing voltage, current, and temperature differences, especially when set points change rapidly, which can disrupt the priority classification of cells and affect cell selection for connection/disconnection.
Innovation Solution
A method is introduced where a battery control circuit determines two priority tables, one for charge and one for discharge modes, using chained lists to manage cell connection/disconnection based on dynamic priority classifications, ensuring cells operate within optimal ranges and account for potential failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single priority table is used for cell selection, then the system is simple to manage, but it cannot adapt to different operating modes (charge/discharge) and rapid set point changes
Solution Approach 1:
The single priority table is segmented into two separate priority tables: one for charge mode and one for discharge mode. Each table is optimized for its specific operating mode, allowing the system to adapt to different charge/discharge requirements and rapid set point changes without managing a complex single table for all scenarios.
Solution Approach 2:
The system dynamically switches between different priority tables based on the operating mode (charge or discharge). This dynamic adaptation allows the battery management system to respond appropriately to rapid set point changes by selecting the pre-optimized priority table corresponding to the current operating mode.
2Speed
If cells are frequently connected/disconnected to follow rapid set point changes, then the system responds quickly to set point variations, but this disrupts the priority classification and affects cell balancing
Solution Approach 1:
Two priority tables are predetermined and prepared in advance, one for charge mode and one for discharge mode. When a set point change occurs, the system switches to the appropriate pre-prepared table rather than recalculating priorities in real-time, maintaining both rapid response and stable priority classification.
Solution Approach 2:
The system continuously monitors the operating mode and set point conditions, providing feedback to select the appropriate priority table. This feedback mechanism ensures that the system maintains stable priority classification by always using the table designed for the current operating conditions, even during rapid set point changes.
Data Source
AI summary
A method of controlling a battery including a first control circuit and a plurality of modules arranged in series between first and second terminals, each module including, between third and fourth terminals, electric cells and switches and a second switch control circuit. The method includes the determination by the first control circuit of a first priority table associated with a battery charge operation and of a second priority table associated with a battery discharge operation, the first priority table including a first classification of the priorities of the electric cells for the charge operation and the second priority table comprising a second classification of the priorities of the electric cells for the discharge operation.