Battery Discharge Termination Control for Mixed-Anode Degradation
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Solution Overview
Problem
Batteries with mixed negative electrode active materials face rapid degradation due to differing charge/discharge efficiencies and reaction voltage ranges, leading to reduced lifespan and performance efficiency.
Innovation Solution
A battery management apparatus and method that adjusts the discharge termination voltage based on measured voltage deviations and cycle regions, using a controller to calculate and adjust the voltage threshold deviations, thereby optimizing battery performance and lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed discharge termination voltage is used, then the battery management system is simple to operate, but the battery lifespan and performance efficiency deteriorate due to rapid degradation of mixed active materials
Solution Approach 1:
The discharge termination voltage is changed from a fixed value to a dynamically adjustable parameter. The controller automatically adjusts the discharge termination voltage based on real-time voltage measurements and pre-set threshold deviations, allowing the system to adapt to battery degradation while maintaining operational simplicity for the user.
Solution Approach 2:
The system implements a feedback mechanism where the controller continuously monitors the battery voltage after discharge termination and compares it against reference values. Based on the voltage deviation feedback, the controller automatically adjusts the discharge termination voltage for subsequent cycles, creating a closed-loop control system that extends battery lifespan.
2Reliability
If the discharge termination voltage is increased, then the capacity retention rate improves, but the voltage deviation from preset thresholds increases
Solution Approach 1:
The system systematically changes the discharge termination voltage parameter based on measured voltage deviations. By adjusting this parameter within controlled ranges and comparing against pre-set threshold deviations, the system optimizes capacity retention while maintaining compliance with voltage specifications.
3Productivity
If voltage measurement and adjustment are performed continuously, then the battery performance is optimized, but the energy consumption and operational complexity increase
Solution Approach 1:
The voltage measurement and adjustment process is implemented periodically at the beginning of each charge/discharge cycle rather than continuously. The controller measures the battery voltage after discharge termination and adjusts the discharge termination voltage for the next cycle, reducing energy consumption while maintaining performance optimization.
Data Source
AI summary
A battery management apparatus includes a measuring unit configured to measure a voltage of a battery after discharge of the battery is terminated to a preset discharge termination voltage in every cycle, and a control unit configured to receive voltage information of the battery from the measuring unit in every cycle, calculate a first voltage deviation of the battery based on a preset first criterion voltage and the voltage of the battery, calculate a second voltage deviation between the first voltage deviation and a preset second criterion voltage in each cycle, and adjust the discharge termination voltage based on a criterion deviation set to correspond to a current cycle and the second voltage deviation calculated in the current cycle.