Battery Equalization Circuit Thermal Management
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Solution Overview
Problem
In power supply systems using multiple secondary batteries, variations in accumulated charge amounts lead to accelerated degradation, reducing battery capacity and lifespan, and existing equalization circuits increase ambient temperature, potentially exceeding safe limits for electronic components.
Innovation Solution
An equalization circuit with discharge sections, a temperature detector, and an equalization controller that selectively discharges batteries and adjusts discharge current based on temperature to balance charge amounts while preventing excessive heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the discharge current is increased to reduce equalization time, then productivity is improved, but the ambient temperature rises exceeding safe limits for electronic components
Solution Approach 1:
The equalization controller dynamically adjusts the discharge current based on real-time temperature feedback from the temperature detector. When temperature exceeds a predetermined threshold, the controller reduces the discharge current to prevent overheating, while allowing higher current when temperature is within safe limits, thus optimizing both equalization speed and thermal safety
Solution Approach 2:
The temperature detector continuously monitors the ambient temperature and provides feedback to the equalization controller. This closed-loop feedback mechanism enables the controller to adaptively control the discharge current, ensuring temperature remains within safe operating ranges while maintaining efficient equalization processing
2Temperature
If the discharge current is reduced to maintain safe ambient temperature, then temperature is controlled, but the time required for equalization processing increases
Solution Approach 1:
The system dynamically adjusts the discharge current based on temperature conditions rather than using a fixed low current. When temperature is within safe limits, higher current is applied to minimize equalization time; when temperature approaches thresholds, current is reduced to maintain safety, optimizing the trade-off between speed and thermal management
Solution Approach 2:
The equalization controller changes the discharge current parameter in response to temperature variations. By adjusting this critical parameter based on real-time temperature data, the system achieves efficient equalization processing while preventing excessive heat generation that would extend processing time
3Use of energy by moving object
If secondary batteries are charged with variations in accumulated charge amount, then charge capacity is improved, but degradation is accelerated reducing reliability
Solution Approach 1:
The equalization circuit equalizes the accumulated charge amounts across all secondary batteries by selectively discharging batteries with higher charge levels. This creates equipotential conditions where all batteries operate at similar charge states, preventing overcharge/overdischarge cycles that would accelerate degradation and reduce reliability
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 reduces the time required for equalization processing while maintaining ambient temperature within safe limits, thereby extending battery lifespan and ensuring reliable operation.
Implementation Method 1
discharge sections which are provided correspondingly to secondary batteries respectively, and discharge the corresponding secondary batteries to convert energy resulting from the discharge into heat
Data Source
AI summary
An equalization circuit includes: discharge sections which are provided correspondingly to secondary batteries respectively, and discharge the corresponding secondary batteries to convert energy resulting from the discharge into heat; a temperature detector which detects a temperature under the converted heat; and an equalization controller which selects a discharge section as a selection discharge section, the selection discharge section corresponding to a secondary battery of the secondary batteries to be discharged, the equalization controller causing the selection discharge section to discharge the corresponding secondary battery, and equalizing electric quantities accumulated in the secondary batteries, wherein if the secondary battery is discharged by the selection discharge section and if the temperature detected by the temperature detector is higher than a predetermined reference temperature, the equalization controller reduces a discharge current to a value lower than a value when the temperature is lower than the reference temperature.