Contactless Rechargeable Battery with Sheet Coil Resonance
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Solution Overview
Problem
Conventional contactless power transmission techniques for rechargeable secondary batteries interchangeable with dry batteries face issues of convenience and safety, particularly with electromagnetic induction methods, which require precise positional alignment and can cause induction heating, and lack a practical implementation for alkaline secondary batteries that meet size and capacity standards.
Innovation Solution
A contactless rechargeable secondary battery design utilizing a power receiver coil shaped like a sheet, installed along the inner or outer surface of a cylindrical casing, enables efficient magnetic field resonance power transmission over a longer distance with reduced efficiency loss, allowing for casual orientation and positioning during charging, and incorporates features like magnetic and insulating layers to enhance power reception and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If electromagnetic induction method is used for contactless power transmission, then power can be transmitted without physical contact, but power transmission efficiency drops significantly with positional shifts and requires precise alignment
Solution Approach 1:
The patent changes the fundamental parameter of power transmission from electromagnetic induction to magnetic field resonance. This parameter change allows the system to operate at resonance frequency, enabling efficient power transmission over longer distances without requiring precise positional alignment between transmitter and receiver coils.
Solution Approach 2:
The patent utilizes magnetic field resonance, which involves oscillating magnetic fields at specific frequencies. By tuning the receiver coil to resonate at the same frequency as the transmitter coil, the system achieves efficient energy transfer without requiring precise mechanical alignment, thereby resolving the contradiction between ease of operation and energy loss.
2Ease of operation
If electromagnetic induction method is used for contactless power transmission, then contactless charging is achieved, but induction heating occurs causing safety issues
Solution Approach 1:
The patent changes the power transmission parameter from electromagnetic induction to magnetic field resonance. This parameter change fundamentally alters how energy is transferred, using resonant coupling instead of induction, thereby eliminating the harmful induction heating effect while maintaining contactless charging capability.
Solution Approach 2:
The patent converts the potential harmful effect of electromagnetic interaction into a beneficial resonance phenomenon. By utilizing magnetic field resonance instead of induction, the system achieves efficient power transfer without the harmful heating effects, effectively converting a potentially harmful electromagnetic interaction into a controlled and beneficial resonant coupling.
3Volume of moving object
If coil is wound around the axis of the secondary battery for mounting efficiency, then space utilization is improved, but the number of coil turns must be increased to achieve practical power transmission
Solution Approach 1:
The patent changes the power transmission method from electromagnetic induction to magnetic field resonance. This parameter change allows for practical power transmission with a reduced number of coil turns, as resonance coupling is more efficient at longer distances and requires fewer turns to achieve the same power transfer level, thereby reducing the space required for coil winding.
4Loss of energy
If magnetic field resonance method is used, then power can be transmitted over longer distance with less efficiency loss, but the system complexity increases
Solution Approach 1:
The patent implements a universal magnetic field resonance system that can charge multiple types of batteries simultaneously. The receiver coil and resonance capacitor configuration creates a multi-functional system that can operate with different battery types and orientations, reducing the need for multiple specialized charging systems and thereby managing complexity through universality.
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 solution provides a more convenient and efficient contactless charging system that maintains high power transmission efficiency and battery capacity within standard size constraints, enabling simultaneous charging of multiple batteries without precise alignment and minimizing safety risks.
Implementation Method 1
uses magnetic field resonance whereby oscillation of a magnetic field generated when an electric current flows through a power transmitter-side coil is transmitted to a receiver-side resonance circuit oscillating at the same frequency
Implementation Method 2
a rectifier circuit adapted to rectify the AC power received by the power receiver circuit
Data Source
AI summary
A contactless rechargeable alkaline secondary battery includes an alkaline secondary battery; a power receiver circuit having receiver coils and a resonance capacitor and adapted to receive AC power via magnetic field resonance, the resonance capacitor connected with the receiver coils L1 to L4; a rectifier circuit adapted to rectify the AC power; a current limiter circuit adapted to limit a charging current flowing from the rectifier circuit to the alkaline secondary battery; and an outer casing configured to be cylindrical in shape, adapted to house the alkaline secondary battery, and provided with a positive terminal and a negative terminal, the positive terminal being connected with a positive pole of the alkaline secondary battery and the negative terminal being connected with a negative pole of the alkaline secondary battery, wherein the power receiver coils are shaped like a sheet of an electric wire wound along a plane.