Secondary Battery AC Heating Circuit Using High-Frequency Resonance
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Solution Overview
Problem
Existing temperature raising devices for secondary batteries are inefficient in raising the temperature of secondary batteries.
Innovation Solution
A temperature raising device that employs an AC generation circuit connected to the secondary battery, utilizing a high frequency band beyond the frequency at which the resistance component of the battery's impedance is minimized, and incorporating a capacitor element to resonate with the inductance element, thereby circulating an alternating current to efficiently raise the battery's temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If an alternating current at the frequency where resistance component is minimized is used, then energy loss is reduced, but temperature raising efficiency is insufficient
Solution Approach 1:
The invention changes the frequency parameter of the alternating current from the minimum resistance frequency to a higher frequency band. This parameter change exploits the skin effect and proximity effect that occur at high frequencies, where the resistance component increases due to non-uniform current distribution, thereby converting electrical energy more efficiently into heat energy for temperature raising.
2Temperature
If a high frequency alternating current is used to raise temperature efficiently, then temperature raising efficiency is improved, but energy loss increases due to increased resistance
Solution Approach 1:
The invention converts the harmful effect of increased resistance at high frequencies (which would normally cause energy loss) into a beneficial effect. By operating in the high frequency band where resistance is elevated due to skin effect and proximity effect, the device intentionally increases resistive heating to improve temperature raising efficiency, thereby turning what is typically considered a disadvantage into an advantage.
3Power
If resonance between inductance element and capacitor element is utilized, then alternating current is amplified, but device complexity increases
Solution Approach 1:
The invention utilizes the inherent inductance element already present in the secondary battery and combines it with a capacitor element to create a resonant circuit. The system leverages the natural electrical characteristics of the battery without requiring additional inductance components, allowing the circuit to self-resonate and amplify the alternating current while minimizing additional device complexity.
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
The device effectively increases the temperature of the secondary battery by optimizing the frequency and circuit configuration, resulting in a more efficient heat generation quantity compared to conventional methods.
Implementation Method 1
The AC generation circuit raises the temperature of the secondary battery by circulating an alternating current, which is amplified by resonating an inductance element of the secondary battery and the capacitor element with each other in a high frequency band
Implementation Method 2
raise the temperature of the secondary battery by circulating an alternating current... resulting in a more efficient heat generation quantity
Data Source
AI summary
The present invention includes an AC generation circuit which is configured to be connected to a secondary battery having characteristics in which a resistance component of an impedance of the secondary battery decreases as a frequency of an alternating current flowing in the secondary battery rises from a low frequency and the resistance component increases as the frequency moves to a high frequency side from a frequency at which the resistance component is minimized and to raise the temperature of the secondary battery by circulating an alternating current at a frequency in a high frequency band higher than the frequency at which the resistance component is minimized in the secondary battery.