Battery Cell Charging Control for Path Impedance Voltage Drop
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Solution Overview
Problem
Conventional battery charging methods fail to account for voltage drops due to path impedance, resulting in battery cell voltage remaining below maximum potential and reduced output current, leading to longer charging times.
Innovation Solution
A semiconductor device with a controller that generates a voltage command value for the charger to set the upper limit of the output voltage higher than the battery's maximum chargeable voltage, accounting for voltage drops and maintaining a larger potential difference to increase charging current and shorten charging time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the output voltage of the charger is set to MaxV during constant voltage charging, then the battery cell voltage does not exceed safe limits, but the battery cell voltage remains below MaxV due to path impedance voltage drop, resulting in reduced output current and longer charging time
Solution Approach 1:
The controller performs preliminary calculation of the voltage drop caused by path impedance before charging, and pre-adjusts the charger's output voltage command value to compensate for this drop. By anticipating the voltage loss and compensating in advance, the system ensures the battery cell receives the correct voltage without exceeding safety limits while maintaining optimal charging current throughout the charging process.
2Reliability
If the output voltage of the charger is set to MaxV, then battery cell voltage safety is ensured, but the potential difference between charger output and battery cell is reduced, leading to lower output current
Solution Approach 1:
The controller dynamically adjusts the charger's output voltage parameter by calculating and compensating for the path impedance voltage drop. Instead of using a fixed MaxV setting, the system modifies the voltage command value to account for the voltage loss in the charging path, thereby maintaining an optimal potential difference that ensures both safety and maximum charging current.
3Reliability
If constant voltage charging is performed with output voltage set to MaxV, then overvoltage is prevented, but the battery cell voltage does not reach maximum potential due to voltage drop, reducing charging efficiency
Solution Approach 1:
The controller implements a feedback mechanism where it continuously monitors the charging state and calculates the actual voltage drop across the path impedance. Based on this feedback information, the controller adjusts the charger's output voltage command to compensate for the voltage loss, ensuring the battery cell reaches its maximum potential while maintaining overvoltage protection and optimizing charging efficiency.
Data Source
AI summary
Semiconductor device includes a controller for controlling a charging of a battery cell. When the battery cell is charged, the controller generates a voltage command value which instructs to a charger so that an upper limit value of an output voltage output from the charger is higher than a predetermined voltage which is a maximum potential voltage that the battery cell can be charged maximally.