Battery Charging Current Control Using Static Voltage and DC Resistance
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Solution Overview
Problem
Existing battery charging methods face challenges in maintaining high charging speed while preventing overvoltage protection, which can damage battery cells, by either reducing current increase speed or lowering charging voltage, thereby compromising charging efficiency.
Innovation Solution
A battery charging method that acquires real-time static voltage and DC resistance to determine the maximum charging current matching with the current static voltage, ensuring that the charging process avoids overvoltage protection without reducing charging speed by using pre-determined relationships between DC resistance, static voltage, and maximum charging current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the current increase speed is reduced or charging voltage is lowered to prevent overvoltage protection, then battery safety is improved, but charging speed deteriorates
Solution Approach 1:
The patent implements dynamic adjustment of charging current based on real-time battery state monitoring. The charging current is not fixed but continuously adapted according to the battery's instantaneous voltage and resistance characteristics, allowing the system to maintain maximum safe charging speed at each moment rather than using a conservative fixed current limit throughout the charging process.
Solution Approach 2:
The patent employs a feedback mechanism where the charging system continuously monitors the battery's voltage and resistance in real-time, compares these values against safety thresholds, and automatically adjusts the charging current accordingly. This closed-loop control ensures the charging current remains within safe boundaries while maximizing charging speed, resolving the contradiction between safety and productivity.
2Productivity
If maximum charging current is used to maintain high charging speed, then charging efficiency is improved, but overvoltage protection is triggered which damages battery cells
Solution Approach 1:
The patent performs preliminary calculations to determine the maximum safe charging current before actually applying it to the battery. By pre-calculating the safe current limit based on real-time battery parameters and storing a correspondence relationship between voltage, resistance, and safe current values, the system ensures that the charging current never exceeds safe boundaries while still maintaining maximum possible charging efficiency.
Solution Approach 2:
The patent changes the charging current parameter dynamically based on battery state parameters (voltage and resistance). Instead of using a fixed charging current, the system continuously adjusts the current parameter according to the battery's instantaneous characteristics, allowing maximum efficient charging without triggering overvoltage protection. The system also pre-establishes a correspondence relationship among voltage, resistance, and safe current values to guide this parameter adjustment.
3Reliability
If real-time monitoring and dynamic adjustment of charging current is implemented, then charging safety and efficiency are improved, but system complexity increases
Solution Approach 1:
The patent implements a self-service charging system where the battery effectively monitors and regulates its own charging process. The battery's voltage and resistance serve as feedback signals that automatically determine the appropriate charging current without requiring complex external control systems. The correspondence relationship between voltage, resistance, and safe current values enables the system to self-adjust, reducing the need for complex control logic while maintaining high safety and efficiency.
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 method ensures safe and efficient battery charging by maintaining high charging speed while preventing overvoltage protection, allowing the battery to be charged with the maximum current in each stage without triggering protection mechanisms.
Implementation Method 1
determining the maximum charging current matching with the current static voltage according to a real-time static voltage and a real-time DC resistance of the battery
Data Source
AI summary
A battery charging method includes: acquiring a current static voltage of a battery in a current charging stage, and determining the maximum charging current matching with the current static voltage, during staged charging of the battery; and charging the battery according to the maximum charging current. The charging speed can be guaranteed, and the overvoltage protection cannot be triggered during each charging stage, thereby preventing damages to battery cells.