Helical Wireless Charging Coil for Rechargeable Battery
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Solution Overview
Problem
The magnetic field resonance mode for wireless charging faces limitations in positional flexibility between the power transmitting and receiving coils, leading to inefficiencies and potential failure in charging due to induced currents canceling each other out, especially when the battery is laid horizontally.
Innovation Solution
A rechargeable battery design with a power receiving coil helically wound around a cylindrical outer peripheral side surface, exposing the surface and forming closed regions to maximize interlinkage magnetic flux, while reducing the number of turns and layers to minimize resistance and maintain high efficiency, and incorporating a magnetic sheet to prevent eddy currents, thereby stabilizing the roll angle and enhancing charging convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power receiving coil is wound in multiple layers to increase the number of turns, then the induced electromotive force increases, but the resistance increases and power transfer efficiency decreases
Solution Approach 1:
The patent transitions from planar coil winding to three-dimensional helical winding around the cylindrical battery surface. This spatial transformation allows the coil to achieve sufficient induced electromotive force through optimized geometric configuration rather than simply increasing the number of turns, thereby maintaining lower resistance and higher power transfer efficiency
2Reliability
If the power receiving coil is tightly wound around the battery surface, then the coupling coefficient increases, but the battery surface cannot be exposed and heat dissipation is reduced
Solution Approach 1:
The helical winding configuration creates localized regions of close coupling between adjacent turns while maintaining overall exposure of the battery surface. This local quality approach ensures sufficient magnetic coupling in critical areas while preserving heat dissipation pathways through the exposed battery surface
3Ease of operation
If the battery is laid horizontally for charging, then charging convenience increases, but induced currents cancel each other out and charging efficiency decreases
Solution Approach 1:
The helical winding around the cylindrical surface creates a three-dimensional magnetic flux distribution that remains effective regardless of the battery's orientation. This spatial configuration ensures that magnetic flux lines penetrate the coil structure effectively whether the battery is vertical or horizontal, eliminating the cancellation effect that occurs with planar coil designs
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 design significantly reduces the dead angle range for efficient charging, increases positional flexibility, and improves power transfer efficiency, ensuring reliable charging even when the battery is laid horizontally, while reducing heat generation and safety risks.
Implementation Method 1
a magnetic field is generated by supplying electric power from a power supply to a power transmitting coil, and the magnetic field causes a power receiving coil to generate an induced electromotive force
Implementation Method 2
incorporating a magnetic sheet to prevent eddy currents
Data Source
AI summary
A rechargeable battery includes: a battery body including a cylindrical outer peripheral side surface; and a power receiving coil wound in at most a single layer around the outer peripheral side surface, and electrically connected to the battery body. The power receiving coil is helically wound around the outer peripheral side surface while forming a space from which the outer peripheral side surface is exposed.