Passive Battery Cell Discharge for Rapid Post-Charging Balancing
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Solution Overview
Problem
Existing battery cell balancing methods require extensive charging and discharging cycles, leading to prolonged charging times and machine downtime, as they do not efficiently balance cell states post-charging operation.
Innovation Solution
A battery management system that determines the state of charge of each cell post-charging, identifies imbalances, and uses bleed resistors to passively discharge energy from higher-charged cells to balance them with lower-charged cells within a threshold range, allowing for quicker machine operation and reduced downtime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cell balancing is performed during charging using traditional methods, then cell state of charge balance is improved, but charging time is extended and machine downtime increases
Solution Approach 1:
The system performs cell balancing by discharging energy from overcharged cells before the charging operation completes, using recorded state of charge data from the charging process. This preliminary balancing action allows the machine to be reconnected to the charger without waiting for traditional post-charging balancing to complete, thereby reducing machine downtime while maintaining cell balance.
2Adaptability or versatility
If cell balancing is performed after charging operation ends, then machine operational flexibility is improved, but accuracy in determining state of charge decreases
Solution Approach 1:
The system records state of charge information for each cell during the charging operation when the battery is in a steady state and measurements are most accurate. This preliminary data capture ensures high measurement precision, and the system later uses this recorded data to perform balancing operations after charging ends, thereby maintaining both accuracy and operational flexibility.
3Reliability
If traditional balancing circuits are used to balance cell states, then cell energy distribution is improved, but the system requires extensive charging and discharging cycles
Solution Approach 1:
The system extracts and removes energy from cells that have reached maximum state of charge during the charging operation, using bleed resistors to discharge the excess energy. This selective energy removal prevents the need for extensive charging and discharging cycles required by traditional balancing circuits, thereby improving charging efficiency while maintaining proper cell energy distribution.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables rapid balancing of battery cells after charging, reducing downtime and extending the battery's operational life by minimizing unnecessary charging and discharging cycles, thus maintaining balanced cell states efficiently and effectively.
Implementation Method 1
discharge a determined amount of energy from a identified battery cell... activating a bleed resistor associated with the identified battery cell
Data Source
AI summary
A battery management component for passive battery cell discharge is disclosed. The battery management component may determine that a charging operation associated with a battery has ended. The battery management component may identify, based on the charging operation ending, that a first cell of the battery has a first state of charge. The battery management component may determine that a second cell of the battery has a second state of charge that is outside of a threshold range of the first state of charge. The battery management component may determine, based on the first and second states of charge, an amount of energy to be removed from the first cell to enable the first state of charge to be within the threshold range of the second state of charge. The battery management component may discharge energy from the first cell based on the determined amount of energy.