Battery Charging Power Limit Control Using Real-Time Cell Voltage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for setting the maximum output limit of a battery pack rely on pre-stored tables of temperature and voltage, which are inefficient and require additional storage, and do not allow for real-time adjustments.
Innovation Solution
A method that sets the maximum output limit of a battery pack in real-time by monitoring the maximum and minimum voltages of battery cells connected in series or parallel, without the need for additional tables, by reducing the charging or discharging power limit when specific voltage thresholds are exceeded or maintained for predetermined periods, and restoring the limits based on counted values or state changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the maximum output limit is set using pre-stored tables of temperature and voltage, then the battery pack output limit can be determined, but additional storage is required and real-time adjustments are not possible
Solution Approach 1:
The patent extracts the temperature and voltage data from the pre-stored tables and processes only the necessary real-time voltage data from battery cells. By taking out only the essential real-time measurements needed for power limit calculation, the system eliminates the need for storing large lookup tables while maintaining accurate output limit determination.
Solution Approach 2:
The system transitions from static pre-stored tables to dynamic real-time calculation. The maximum output limit is continuously adjusted based on real-time voltage measurements of battery cells, allowing the power limit to adapt dynamically to changing battery states without requiring additional storage infrastructure.
2Reliability
If the maximum output limit is set using pre-stored tables of temperature and voltage, then the battery pack output limit can be determined, but real-time adjustments cannot be made
Solution Approach 1:
The system implements continuous feedback by monitoring real-time voltage of individual battery cells and immediately adjusting the maximum output limit based on current battery state. This feedback mechanism enables real-time adjustments to the power limit, allowing the system to respond dynamically to changing battery conditions without relying on static pre-stored tables.
Solution Approach 2:
The patent transforms the static table lookup approach into a dynamic real-time calculation system. The maximum output limit is continuously recalculated based on real-time voltage measurements, enabling the system to adapt instantly to changing battery states and provide real-time adjustments to power delivery.
3Productivity
If voltage of battery cells is monitored in real-time to set power limits, then real-time adjustment is possible, but measurement and control complexity increases
Solution Approach 1:
The patent segments the battery pack into individual battery cells for monitoring. By measuring the voltage of each cell separately and identifying the maximum and minimum voltages, the system can determine the state of charge and set appropriate power limits. This segmentation approach simplifies the measurement process by focusing on extreme values rather than requiring complex analysis of all cell interactions.
Solution Approach 2:
The system changes the measurement parameter from monitoring all battery cell voltages individually to focusing on the maximum and minimum voltage values. This parameter change simplifies the control logic and reduces measurement complexity while still providing sufficient information to accurately determine the battery pack's state of charge and set appropriate power limits.
Data Source
AI summary
A method for setting a charging power limit of a battery when charging the battery, according to an embodiment of the present invention, may include a reference charging power limit setting step in which a referential predetermined charging power limit is set, a real-time charging power limit calculation step in which a real-time charging power limit is calculated in real time according to a current voltage of the battery, a real-time charging power limit setting step in which a charging power limit of the battery is set to the real-time charging power limit calculated in the real-time charging power limit calculation step, and a charging power limit restoring step in which the real-time charging power limit set in the real-time charging power limit setting step is restored to the referential predetermined charging power limit.