Battery Pack Magnetic Field Reduction via Asymmetric Cell Orientation
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Solution Overview
Problem
Battery packs with electrochemical cells generate significant magnetic field emissions during discharge, which can be problematic in applications such as mobile phone usage, especially when current is pulsed, leading to increased noise and interference.
Innovation Solution
The battery pack design incorporates asymmetrical internal electrode constructions and strategic orientations of cells and electrical conductor routing to mitigate magnetic field emissions by causing currents flowing through the cells and conductors to be out of phase, thereby reducing overall magnetic field emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional battery pack construction is used, then energy delivery is achieved, but magnetic field emissions are significant
Solution Approach 1:
The patent applies asymmetry by orienting cells with asymmetrical internal electrode constructions at specific angles (0, 60, 120, 180, 240, or 300 degrees) relative to each other. This asymmetric arrangement causes the magnetic field vectors from individual cells to cancel each other out, reducing overall magnetic field emissions while maintaining energy delivery capability
Solution Approach 2:
The patent converts the harmful magnetic field emissions into a beneficial cancellation effect. By strategically positioning cells with asymmetrical electrode constructions, the magnetic fields that would normally be harmful are made to overlap and substantially compensate each other, transforming the problem into a solution that reduces emissions while preserving power output
2Object-affected harmful factors
If cells are arranged to reduce magnetic field emissions, then magnetic field emissions are reduced, but device complexity increases
Solution Approach 1:
The patent achieves universality by designing a modular cell arrangement system where identical cells with asymmetrical internal electrode constructions can be positioned at multiple standard angles (0, 60, 120, 180, 240, 300 degrees). This universal approach allows the same cell design to achieve magnetic field cancellation in various configurations, simplifying manufacturing while maintaining the emission reduction benefit
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 configuration effectively reduces magnetic field emissions during both discharge and charge cycles, minimizing noise and interference in electronic devices powered by the battery pack.
Implementation Method 1
magnetic field emissions associated with a battery pack are generally not a design consideration
Implementation Method 2
magnetic fields generated by moving electric charges in the tags overlap and substantially compensate each other
Data Source
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AI summary
A battery pack with reduced magnetic field emissions includes a plurality of cells (1301,1302) coupled electrically together by a first electrical conductor (1307) and a second electrical conductor (1308). The first electrical conductor (1307) couples positive terminals (1305,1306) to a terminal block (1311), while the second electrical conductor (1308) couples the negative terminals (1303,1304) to the terminal block (1311). Each cell (1301,1302) contains an asymmetrical internal electrode construction (1313,1314) having electrical tabs (502,503) coupled to a cathode and anode. The cells (1301,1302) can be arranged with their corresponding asymmetrical internal electrode constructions (1313,1314) oriented in different directions to reduce magnetic field emissions. The first electrical conductor (1307) and second electrical conductor (1308) can be routed such that magnetic fields generated by discharge currents tend to reduce other magnetic fields produced by other components within the battery pack.