Adaptive Lithium-Ion Battery Charging Control for Low-Temperature Protection
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Solution Overview
Problem
Conventional charging apparatuses for lithium-ion batteries, when used in low-temperature environments, experience reduced battery capacity and lifespan due to high current, high voltage quick charging, and lack a method to adapt charging control based on temperature.
Innovation Solution
A charging apparatus that includes a battery pack with a temperature sensor and a charger with a charging control circuit, which monitors internal temperature and adjusts the charging mode by switching from constant current to constant voltage charging based on temperature thresholds, using different current and voltage values depending on whether the temperature is above or below a certain threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high current, high voltage quick charging control is performed, then charging speed is improved, but battery capacity and lifespan are reduced in low-temperature environments
Solution Approach 1:
The charging control circuit dynamically adjusts charging parameters based on real-time temperature feedback from the temperature sensor. When temperature is above threshold, high current/high voltage quick charging is applied; when temperature drops to threshold or below, the circuit automatically switches to low current charging mode, making the charging system adaptive to temperature conditions and preventing battery damage
Solution Approach 2:
The invention changes the charging current and voltage parameters based on temperature conditions. At temperatures above the threshold, high current and high voltage are used for fast charging. When temperature reaches or falls below the threshold, the system switches to low current charging, thereby adapting charging parameters to environmental conditions and protecting the battery
2Reliability
If temperature monitoring and adaptive charging control are implemented, then battery protection is improved, but device complexity increases
Solution Approach 1:
The charging control circuit continuously monitors temperature through the temperature sensor and uses this feedback to automatically adjust charging current. When temperature is above threshold, high current charging is maintained; when temperature drops to threshold or below, the circuit automatically reduces current. This closed-loop feedback mechanism provides intelligent protection without requiring complex external control systems
Solution Approach 2:
The charging system performs self-protection by using its own temperature sensor and control circuit to monitor and adjust charging parameters. The control circuit automatically detects temperature conditions and switches between charging modes without external intervention, making the system self-regulating and reducing the need for additional protective devices
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 solution allows for adaptive charging control that protects lithium-ion batteries in low-temperature environments by reducing high current and voltage exposure, thereby extending battery life and ensuring efficient charging.
Implementation Method 1
a temperature sensor for detecting a temperature of the battery pack
Implementation Method 2
a power supply circuit for charging the battery cells of the battery pack
Data Source
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AI summary
A charging apparatus includes a battery pack, which includes a cell voltage detection unit outputting a signal if a detected cell voltage is not smaller than V1, and a temperature sensor detecting a temperature of the battery pack; and a charger, which includes a charging control circuit and a pack voltage detection unit detecting a voltage across two terminals of the battery pack. If the detected temperature from the temperature sensor exceeds 0°C, the charging control circuit switches to a constant voltage charging when the signal from the cell voltage detection unit is received; and if otherwise, the charging control unit switches to the constant voltage charging when receiving the signal or the detected pack voltage exceeds V2, whichever occurs first.