Resonant AC Generation Circuit for Battery Temperature Raising
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Solution Overview
Problem
Conventional temperature raising devices for secondary batteries, such as those used in electric vehicles, face inefficiencies in raising the temperature of lithium-ion batteries, which affects their charging and discharging performance.
Innovation Solution
An AC generation circuit and temperature raising device that adjusts the inductance and capacitance of capacitors and inductors to generate an AC current, using a resonant operation to efficiently raise the battery temperature by switching energy between magnetic and electrostatic energy, with a controller managing the series and parallel connections of capacitors to optimize frequency and waveform.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional ripple current generation method is used, then the temperature of secondary battery can be raised, but the energy efficiency is insufficient
Solution Approach 1:
The patent adjusts the resonant frequency of the AC generation circuit to match the frequency at which the absolute value of impedance is relatively decreased in the secondary battery. By changing the frequency parameter and using resonant operation between the inductance component and capacitor, the circuit achieves more efficient energy transfer and reduces energy loss while raising battery temperature.
2Temperature
If ripple current is generated at frequency where impedance is decreased, then temperature raising effect is achieved, but the current waveform contains harmonics causing voltage fluctuations
Solution Approach 1:
The patent utilizes resonant vibration between the inductance component and capacitor to generate a sinusoidal AC current waveform. This resonant oscillation produces a clean sine wave with minimal harmonics, ensuring voltage stability while maintaining the temperature-raising effect through controlled frequency matching with the battery's impedance characteristics.
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 improves energy efficiency and effectively raises the battery temperature, enhancing the performance and longevity of secondary batteries by ensuring a sinusoidal AC current waveform, thereby reducing voltage fluctuations and harmonic components.
Implementation Method 1
a resonant operation between an inductance component and a capacitor to generate an AC current
Implementation Method 2
switching energy between magnetic energy stored in the inductance component and electrostatic energy stored in the capacitor
Data Source
AI summary
An alternating current (AC) generation circuit includes a first capacitor having a first end connected to a positive electrode side of a power storage having an inductance component, a second capacitor having a second end connected to a negative electrode side of the power storage, a parallel switch unit configured to connect the first capacitor and the second capacitor in parallel to the power storage, a series switch unit configured to connect the first capacitor and the second capacitor in series with the power storage, a first inductor connected between the positive electrode side of the power storage and the first end of the first capacitor, a second inductor connected between the second end of the second capacitor and the negative electrode side of the power storage, a third capacitor connected between the second end of the first capacitor and the negative electrode side of the power storage, and a fourth capacitor connected between the positive electrode side of the power storage and the first end of the second capacitor.