Adaptive Battery Charging Control for Thermal Management
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Solution Overview
Problem
Conventional battery charging methods often lead to premature battery decay due to high temperatures and non-uniform temperature distribution, as they do not consider the state of battery degradation, using high preset currents to charge batteries quickly.
Innovation Solution
A method that adaptively adjusts charging modes based on monitored deterioration indices such as temperature, voltage, internal resistance, and state of charge, switching between constant current, constant power, pulse, and constant voltage modes to optimize charging and prevent overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high preset current is used in constant-current mode to charge battery quickly, then charging speed is improved, but battery temperature rises and temperature distribution becomes non-uniform, leading to premature battery decay
Solution Approach 1:
The patent dynamically adjusts charging parameters based on real-time monitoring of battery temperature, voltage, and current. The charging mode transitions from constant-current to constant-power or pulse charging when temperature thresholds are exceeded, and the duty cycle is dynamically adjusted to maintain optimal temperature while continuing charging.
Solution Approach 2:
The patent changes charging parameters (current, power, duty cycle) based on battery state. When temperature rises above thresholds, the system switches from high-current constant-current mode to lower-power modes, adjusting the duty cycle to reduce thermal stress while maintaining charging progress.
2Loss of time
If high preset current is used in constant-current mode, then charging time is reduced, but battery lifespan is deteriorated due to high temperature effects
Solution Approach 1:
The patent employs pulse charging mode with adjustable duty cycles when temperature thresholds are exceeded. This periodic charging approach allows the battery to cool between pulses while maintaining charging progress, reducing thermal stress and extending battery lifespan compared to continuous high-current charging.
Solution Approach 2:
The patent maintains continuous charging operation by switching between different charging modes (constant-current, constant-power, pulse charging) based on temperature conditions. This ensures the charging process continues without interruption while adapting to thermal conditions to protect battery lifespan.
3Device complexity
If conventional charging method is used without considering battery degradation, then charging process is simple, but battery performances and functions are deteriorated
Solution Approach 1:
The patent implements a feedback control system that continuously monitors battery temperature, voltage, and current, and adjusts charging parameters accordingly. The BMS receives real-time data and dynamically switches between charging modes to optimize both battery performance and charging efficiency.
Solution Approach 2:
The patent creates a universal charging method that adapts to different battery states and conditions. The same charging system can operate in constant-current mode for healthy batteries, switch to constant-power mode for moderate temperature conditions, and use pulse charging for high-temperature scenarios, making it applicable to various battery conditions without requiring different hardware systems.
Data Source
AI summary
A method of diagnosing a battery and adaptively adjusting charging modes of the battery includes the steps of initially charging the battery using a constant current mode, wherein the battery is charged by a fix current in the constant current mode; monitoring a deterioration index by a battery management system (BMS), the deterioration index including a highest temperature (Tempmax), an instantaneous temperature difference (ΔTemp), an instantaneous voltage difference (ΔV), an instantaneous internal resistance (IRmax), and a state of charge (SoC) of the battery; when Temp exceeds a predetermined temperature threshold, pausing charging the battery; charging the battery by a constant power charging mode when Tempmax becomes smaller than 90% of the predetermined temperature threshold, wherein the battery is charged by a fix electric power in the constant power mode; charging the battery by the constant current charging mode when Tempmax becomes smaller than 50% of the predetermined temperature thresh old.