Battery Charging Control Device Voltage Difference Threshold
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Solution Overview
Problem
Rechargeable batteries, particularly laminated Li-ion batteries, suffer from degradation that leads to premature recognition of full charge due to increased resistance, resulting in incomplete charging and energy loss, as existing control systems cannot effectively differentiate between degradation-induced voltage increases and actual full charge states.
Innovation Solution
A control device that monitors battery voltage during charging, stops when the upper limit is reached, and resumes charging if the voltage difference after stopping exceeds a predetermined threshold, incrementally adjusting the upper voltage limit to ensure complete charging without overcharging, using sensors to determine the state of charge and degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If battery voltage is monitored to detect full charge state, then charging control reliability is improved, but measurement precision deteriorates due to degradation-induced voltage increases
Solution Approach 1:
The control device performs preliminary actions by stopping charging temporarily when voltage reaches the upper limit, then measuring the voltage difference after charging resumes. This preliminary voltage difference measurement helps distinguish between degradation-induced voltage increases and actual full charge states, improving detection precision without compromising charging control reliability.
Solution Approach 2:
The system implements feedback by continuously monitoring battery voltage during charging, comparing it against the upper voltage limit, and adjusting charging status based on the voltage difference measured after temporary charging stops. This feedback mechanism enables the control device to adapt to battery degradation while maintaining accurate full charge detection.
2Reliability
If charging is stopped when voltage exceeds upper limit, then overcharging prevention is improved, but productivity deteriorates due to premature charging termination
Solution Approach 1:
The control device uses feedback by temporarily stopping charging when voltage reaches the upper limit, then resuming charging and measuring the voltage difference. If the voltage difference exceeds a threshold, charging continues; otherwise, charging is terminated. This feedback-based approach prevents premature charging termination while ensuring overcharging prevention, thereby maintaining both reliability and productivity.
Solution Approach 2:
The system performs a preliminary charging stop and voltage difference measurement before making the final decision to terminate charging. This preliminary action allows the control device to distinguish between temporary voltage spikes due to degradation and actual full charge conditions, preventing premature charging termination and maintaining charging efficiency.
3Duration of action of stationary object
If voltage threshold is set to accommodate degradation, then battery lifetime is extended, but loss of energy increases due to incomplete charging
Solution Approach 1:
The control device dynamically adjusts charging control based on real-time voltage difference measurements rather than using a fixed voltage threshold. By temporarily stopping charging and measuring the voltage difference after resumption, the system adapts to battery degradation conditions, enabling complete charging while extending battery lifetime through appropriate charging control.
Solution Approach 2:
The system uses feedback by measuring voltage difference after temporary charging stops and using this information to decide whether to continue or terminate charging. This feedback mechanism prevents energy loss from incomplete charging while accommodating battery degradation, as the control device only terminates charging when the voltage difference confirms actual full charge state.
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 approach allows for reliable and efficient charging of rechargeable batteries by distinguishing between degradation-induced voltage increases and full charge states, ensuring complete energy extraction while preventing overcharging, applicable to various battery types including solid-state and liquid batteries.
Implementation Method 1
One important aspect of charge control is to assure that any overcharging and/or over-discharging of the battery is avoided. For this purpose the battery voltage may be monitored, which is increasing during charging.
Implementation Method 2
The degradation leads to increased resistance which in turn increases the measured voltage of the battery during charging.
Data Source
AI summary
A control device for controlling charging of a rechargeable battery, the control device being configured to: determine the voltage of the battery during charging of the battery, stop charging, when the determined voltage exceeds a predetermined upper voltage limit, determine the voltage of the battery after stopping charging, determine the voltage difference between the predetermined upper voltage limit and the determined voltage of the battery after stopping charging, and continue charging, when the determined voltage difference exceeds a predetermined threshold. A corresponding method controls charging of a rechargeable battery.