Flexible Printed Circuit Board Noise Shielding via Voltage Line Overlap
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Solution Overview
Problem
Existing battery packs face challenges in suppressing electromagnetic noise interference on temperature detection lines, which can lead to detection errors and thermistor damage, often requiring additional shield layers that increase costs.
Innovation Solution
A flexible printed circuit board configuration where voltage detection lines are arranged to overlap and sandwich temperature detection lines, functioning as a shield without the need for dedicated shielding layers, thereby reducing noise interference effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a dedicated shield layer is added to suppress noise on temperature detection lines, then noise suppression is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The voltage detection lines are designed to serve dual functions: detecting voltage signals and providing electromagnetic shielding for temperature detection lines. By making the voltage detection lines function as a shield, the patent eliminates the need for dedicated shield layers, thereby reducing device complexity while maintaining noise suppression effectiveness
Solution Approach 2:
The patent merges the shielding function with the voltage detection lines by arranging them to overlap and sandwich the temperature detection lines. This combination integrates two functions (voltage detection and noise shielding) into a single structural element, avoiding the need for separate shield components
2Object-affected harmful factors
If voltage detection lines are arranged to overlap and sandwich temperature detection lines, then noise suppression is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent utilizes the vertical dimension by arranging voltage detection lines on one surface and temperature detection lines on another surface of the flexible printed circuit board, with overlapping projections. This three-dimensional arrangement achieves effective shielding while allowing for standard manufacturing tolerances, as the overlap in the vertical dimension provides noise suppression without requiring extremely precise lateral alignment
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 suppresses electromagnetic noise on temperature detection lines, reducing the risk of detection errors and thermistor damage while maintaining a simple and cost-effective manufacturing process.
Implementation Method 1
the voltage detection lines function as a shield, noise superimposed on the temperature detection lines can be suppressed
Implementation Method 2
a thermistor which detects the temperature of the assembled battery
Data Source
AI summary
A battery pack comprises a battery and a flexible printed circuit board (FPC) utilized to detect a voltage and a temperature of the battery. The FPC comprises a substrate having a front surface and a back surface, a thermistor which detects a temperature of the battery, temperature detection lines and voltage detection lines. The temperature detection lines are electrically connected to a thermistor and arranged between the back surface and the battery. The voltage detection lines are arranged on the front surface so as to overlap the temperature detection lines in a case that the FPC is observed in a plane view in a transmissive manner from a back surface to a front surface.