Rectangular Battery Tab Layout for Magnetic Field Cancellation
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Solution Overview
Problem
Nonaqueous electrolyte secondary batteries generate magnetic fields that interfere with hearing aids and other devices, and existing solutions struggle to balance electrical currents effectively to reduce these fields while avoiding internal short circuits.
Innovation Solution
The battery design positions the positive and negative electrode tabs at the winding starting end and maintains them 2 mm to 12 mm apart, with the positive electrode tab welded between the outer housing and sealing plate, and the negative electrode tab connected to a terminal on the sealing plate, allowing opposite electrical current directions to cancel out magnetic fields and reduce the risk of short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the positive and negative electrode tabs are positioned close together to simplify the battery structure, then the device complexity is reduced, but the risk of internal short circuit increases
Solution Approach 1:
An insulating member is introduced as an intermediary component between the positive and negative electrode tabs. This insulating member prevents direct contact and potential short circuits while allowing the tabs to remain in close proximity, thus maintaining structural simplicity without compromising safety.
2Object-generated harmful factors
If the electrode tabs are arranged to cancel magnetic fields through opposite current directions, then the magnetic field interference is reduced, but the positioning precision and arrangement complexity increase
Solution Approach 1:
The insulating member enables the electrode tabs to be positioned at equivalent locations on opposite sides of the battery, creating symmetrical current paths. This symmetrical arrangement allows magnetic fields to cancel each other out while maintaining manufacturing feasibility through standardized positioning.
3Object-generated harmful factors
If the electrode tabs are positioned at the winding starting end to enable opposite current directions, then the magnetic field cancellation is achieved, but the manufacturing complexity increases
Solution Approach 1:
The insulating member is divided into multiple portions that can be independently positioned and attached. This segmentation allows for flexible integration into the existing manufacturing process, enabling magnetic field cancellation through strategic placement without requiring complete process redesign.
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 effectively suppresses magnetic field leakage, reduces noise effects on hearing aids, and enhances battery reliability by minimizing the risk of internal short circuits, while simplifying the manufacturing process and improving yield.
Implementation Method 1
the positive electrode tab and the negative electrode tab are arranged to extend in opposite directions in the width direction of the battery... opposite electrical current directions to cancel out magnetic fields
Data Source
AI summary
[Problem] To provide a rectangular nonaqueous electrolyte secondary battery for which the generation of a magnetic field due to current during use is suppressed and the danger of internal shorts between the positive electrode tab and negative electrode tab is reduced. [Solution] The positive electrode tab and negative electrode tab are both disposed at the beginning side of a winding for wound electrodes. An outer housing and sealing plate are welded in a state with the positive electrode tab sandwiched at a mating part of the outer housing and sealing plate. The negative electrode tab is electrically connected to a negative electrode terminal provided on the sealing plate. The positive electrode tab and negative electrode tab are divided by a space of 2-12 mm in the direction of battery width.