Charge Control Circuit Dynamic Current Adjustment Battery
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Solution Overview
Problem
Conventional CCCV charging schemes lead to rechargeable battery deterioration due to incomplete charging and overcharging, especially at low and high temperatures, as the terminal voltage may not accurately reflect the full charge state, causing uneven current flow and potential damage.
Innovation Solution
A charge control circuit that dynamically adjusts charging current and voltage based on detected terminal voltage thresholds and temperature, switching from constant current to constant voltage charging when the battery approaches full charge, and reducing current values outside optimal temperature ranges to prevent overcharging and deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If constant current charging is carried out at a large current value to shorten charging time, then charging speed is improved, but battery deterioration increases due to incomplete charging and overcharging
Solution Approach 1:
The patent applies dynamics by transitioning from static constant current charging to dynamic charging that adjusts current based on real-time terminal voltage feedback. The charging current is automatically reduced when terminal voltage approaches full charge voltage, preventing overcharging while maintaining high initial charging current for speed.
Solution Approach 2:
The patent implements feedback control by continuously monitoring terminal voltage and using it to adjust charging current. When terminal voltage reaches a predetermined threshold near full charge voltage, the charging current is automatically reduced, creating a closed-loop control system that prevents overcharging while maintaining charging efficiency.
2Manufacturing precision
If constant current charging is performed until terminal voltage reaches full charge voltage, then charging completeness is improved, but overcharging occurs causing battery deterioration
Solution Approach 1:
The patent applies preliminary anti-action by proactively reducing charging current before the battery actually reaches full charge. By detecting when terminal voltage approaches full charge voltage and preemptively lowering current, the system prevents the harmful effects of overcharging while ensuring complete charging.
Solution Approach 2:
The patent uses feedback control to continuously monitor terminal voltage and adjust charging current accordingly. When terminal voltage reaches a threshold indicating near-full charge, the system automatically reduces current, creating a self-regulating mechanism that prevents overcharging while ensuring complete charging.
3Productivity
If charging is performed at high SOC states with high current, then charging efficiency is improved, but battery deterioration increases due to increased charge current effects
Solution Approach 1:
The patent applies dynamics by making charging current variable rather than constant. The system maintains high current for charging efficiency at lower SOC states, then automatically reduces current when terminal voltage indicates high SOC, dynamically adapting to battery state to prevent deterioration.
Solution Approach 2:
The patent changes the charging current parameter based on terminal voltage feedback. When terminal voltage approaches full charge voltage, the current parameter is automatically reduced, transforming the charging process from high-current throughout to high-current initially then low-current near completion, preventing battery deterioration.
Data Source
AI summary
A charge control circuit includes a charge control unit that controls an operation of a charging unit that charges a rechargeable battery; and a voltage detection unit that detects a terminal voltage of the rechargeable battery, wherein when a terminal voltage of the rechargeable battery as detected by the voltage detection unit is lower than a predetermined first threshold-value voltage, being lower than a full-charge voltage which is a terminal voltage of the rechargeable battery in full charge, the charge control unit causes a constant current charging to the rechargeable battery by requesting the charging unit to supply a charging current of a predetermined first current value, causing the charging unit to supply a charging current of the first current value to the rechargeable battery, when the terminal voltage of the rechargeable battery as detected by the voltage detection unit exceeds the first threshold-value voltage but is less than the full charge voltage, the charge control unit causes the constant current charging to the rechargeable battery by requesting the charging unit to supply a charging current of a second current value that is smaller than the first current value, causing the charging unit to supply a charging current of the second current value to the rechargeable battery, and when the terminal voltage of the rechargeable battery as detected by the voltage detection unit is equal to or greater than the full charge voltage, the charge control unit causes a constant voltage charging to be carried out by causing the charging unit to supply the full charge voltage to the rechargeable battery, as a charge voltage.