Battery Management System with Dual Voltage Range Control
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Solution Overview
Problem
Conventional battery management systems for secondary battery modules in hybrid electric vehicles face issues with incomplete charge and over-discharge due to varying energy levels among unit batteries, leading to battery reversal and damage, as the cut-off voltage range is not sufficient for stable recovery.
Innovation Solution
A battery management system with a sensor, comparator, and controller that measures and compares voltages of unit batteries to both a cut-off and recovery voltage range, cutting off or coupling the battery module based on these ranges to prevent frequent relay activation and ensure stable recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the cut-off voltage range is set to enable quick relay activation, then the response speed improves, but the battery module cannot recover to stable voltage and suffers incomplete charge/over-discharge
Solution Approach 1:
The system performs preliminary voltage recovery action by maintaining the relay in the on-state and allowing charge/discharge operations to continue until the battery voltage naturally recovers to the stable range (2.8-4.3V). This preliminary recovery process prevents incomplete charge and over-discharge before normal operation resumes.
Solution Approach 2:
The system dynamically adjusts the cut-off voltage threshold based on the battery's current state. When voltage drops below 2.8V or rises above 4.3V, the relay activates to cut off current. However, the system allows dynamic recovery operations to occur first, temporarily relaxing the strict voltage threshold to enable stable voltage restoration before resuming normal cut-off operations.
2Reliability
If the cut-off voltage range is set to ensure stable recovery, then battery reliability improves, but relay activation becomes frequent causing operational instability
Solution Approach 1:
The system performs preliminary voltage recovery action by maintaining the relay in the on-state and allowing charge/discharge operations to continue until the battery voltage naturally recovers to the stable range (2.8-4.3V). This preliminary recovery process prevents incomplete charge and over-discharge before normal operation resumes.
Solution Approach 2:
The system dynamically adjusts the cut-off voltage threshold based on the battery's current state. When voltage drops below 2.8V or rises above 4.3V, the relay activates to cut off current. However, the system allows dynamic recovery operations to occur first, temporarily relaxing the strict voltage threshold to enable stable voltage restoration before resuming normal cut-off operations.
3Reliability
If the relay is activated frequently to prevent battery damage, then battery protection improves, but operational continuity deteriorates
Solution Approach 1:
The system performs preliminary voltage recovery action by maintaining the relay in the on-state and allowing charge/discharge operations to continue until the battery voltage naturally recovers to the stable range (2.8-4.3V). This preliminary recovery process prevents incomplete charge and over-discharge before normal operation resumes.
Solution Approach 2:
The system continuously monitors battery voltage and provides feedback to the relay control mechanism. When voltage approaches dangerous thresholds (below 2.8V or above 4.3V), the feedback triggers relay activation. The system uses this feedback to determine when recovery is complete and when to resume normal operations, optimizing the balance between protection and continuity.
Data Source
AI summary
A battery management system for controlling a secondary battery module which includes a plurality of unit batteries includes a sensor, a comparator and a controller. The sensor sequentially measures respective voltages of the unit batteries. The comparator compares the respective voltages of the unit batteries to a cut-off voltage range and a recovery voltage range to determine if the voltages are within the cut-off voltage range and the recovery voltage range. The controller receives comparison results from the comparator, cuts off the secondary battery module from an external device when there is at least one unit battery within the cutoff voltage range, and couples the secondary battery module to the external device when all of the unit batteries are within the recovery voltage range.