Dynamic Load Resistor Adjustment for Battery Internal Resistance Measurement
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Solution Overview
Problem
Existing discharge devices for electricity storage devices face challenges in measuring internal resistance and equalizing battery capacities due to limitations in load resistor values, which affect the optimization of discharging conditions and lead to insufficient polarization and capacity equalization.
Innovation Solution
A discharge device with a controller that adjusts the resistance value of the load resistor based on measured voltage and current, allowing for dynamic adjustment of discharge current to match changing internal resistance and battery conditions, ensuring optimal discharging and equalization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a predetermined load resistor value is installed in the electricity storage device, then the discharge device can perform basic discharging operations, but the measurement precision of internal resistance and the equalization effect of battery capacities deteriorate due to inability to optimize discharging conditions
Solution Approach 1:
The load resistor is divided into multiple resistors that can be selectively connected in parallel or series to create different equivalent resistance values. This segmentation allows the discharge device to adapt to different battery conditions while maintaining measurement precision for internal resistance.
Solution Approach 2:
The discharge device dynamically switches between different load resistor configurations based on real-time battery voltage and current measurements. The controller adjusts the equivalent resistance value during discharging operations to optimize polarization effects and improve internal resistance measurement precision.
2Stability of the object's composition
If the load resistor value is fixed, then the device structure remains simple, but the equalization of battery capacities deteriorates due to insufficient polarization under varying battery conditions
Solution Approach 1:
The discharge device employs dynamic resistance adjustment during discharging operations to maintain optimal polarization conditions across varying battery states. The controller modifies the equivalent resistance value based on real-time voltage and current measurements, ensuring stable capacity equalization without requiring complex mechanical adjustment mechanisms.
Solution Approach 2:
The system changes the electrical resistance parameter during discharging operations to optimize polarization effects. By adjusting the equivalent resistance value according to battery voltage and current levels, the device achieves stable capacity equalization while maintaining a relatively simple overall structure.
3Adaptability or versatility
If a predetermined load resistor value is used, then the initial manufacturing cost is lower, but the adaptability to changing internal resistance and battery conditions deteriorates
Solution Approach 1:
The discharge device dynamically adjusts the equivalent resistance value during discharging operations to adapt to changing battery conditions including internal resistance variations, temperature changes, and state of charge levels. This dynamic adaptation is achieved through controller-based switching between pre-configured resistor combinations rather than complex real-time mechanical adjustments.
Solution Approach 2:
The same set of load resistors serves multiple functions: they provide different resistance values for adapting to various battery conditions, they enable optimized polarization for measurement accuracy, and they facilitate capacity equalization across multiple battery cells. This multi-functionality reduces the need for separate components for each function.
4Measurement precision
If the load resistor value cannot be adjusted, then the control system remains simple, but the measurement accuracy of battery conditions deteriorates under varying temperature and usage conditions
Solution Approach 1:
The discharge device incorporates feedback control where the controller continuously monitors battery voltage and current during discharging operations. Based on this feedback information, the controller automatically adjusts the equivalent resistance value by switching between different load resistor configurations, thereby maintaining optimal measurement conditions across varying temperature and usage scenarios.
Solution Approach 2:
The discharge device performs self-adjustment of the load resistor configuration based on real-time battery condition measurements. The controller automatically determines the appropriate resistance value and switches the corresponding resistor combination without requiring external intervention, enabling the system to maintain measurement accuracy autonomously under varying conditions.
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
Enables stable measurement of battery conditions and equalization of capacities by adapting the load resistor values to changes in internal resistance, ensuring accurate monitoring and equalization of State of Charge (SOC) and internal impedance, even under varying temperature and usage conditions.
Implementation Method 1
A discharge device with a controller that adjusts the resistance value of the load resistor based on measured voltage and current
Data Source
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AI summary
A battery-condition monitoring device (100) that monitors a condition of the battery (10) through discharge thereof includes a discharger (15) and a discharge control device (3). The discharger (15) includes a discharge circuit having a load resistor (1) and a switching element (2) connected in series between a positive electrode of the battery (10) and a negative electrode thereof. The discharge control device (3) controls an open/close operation of the switching element (2). The discharge control device (3) adjusts the resistance value of the load resistor (1) in the discharger (15), thereby enabling an adjustment of a discharge current.