Battery Pack Shielding Pattern for EMI Reduction
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Solution Overview
Problem
Secondary batteries used as power sources in electronic devices face interference issues due to electromagnetic waves generated by protection circuit modules, which can deteriorate the performance of antenna transceiving units, and impedance in the current flow path can hinder smooth operation.
Innovation Solution
A battery pack design incorporating a protection circuit module with multiple circuit layers, including shielding patterns to minimize electromagnetic interference and reduce current path resistance, ensuring efficient operation and minimizing the impact on antenna transceiving units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protection circuit module is added to monitor and control battery charging and discharging, then battery safety and control functionality are improved, but electromagnetic waves generated by the protection device interfere with antenna transceiving units
Solution Approach 1:
A shielding pattern is introduced as an intermediary element between the protection device and the antenna transceiving unit. The shielding pattern, formed by conductive material on the circuit board, acts as a mediator that blocks electromagnetic waves generated by the protection device from reaching the antenna, thereby eliminating interference while preserving the protective function
Solution Approach 2:
The circuit board is divided into functionally distinct regions: a protection device mounting area, an antenna transceiving area, and a shielding pattern region. This segmentation separates the electromagnetic wave source from the sensitive antenna component, allowing each element to perform its function without interfering with others
2Object-affected harmful factors
If circuit layers are designed with shielding patterns to block electromagnetic waves, then electromagnetic interference is reduced, but current flow path impedance may increase
Solution Approach 1:
The shielding pattern is applied locally only in the region where electromagnetic shielding is necessary, rather than covering the entire circuit board. The pattern consists of conductive traces positioned strategically between the protection device and antenna, providing targeted shielding while maintaining low impedance paths for current flow in other areas
Solution Approach 2:
The shielding function is implemented in the planar dimension of the circuit board through conductive patterns, rather than adding vertical thickness through separate shielding layers. This approach provides effective electromagnetic shielding while maintaining thin circuit board design and preserving current flow characteristics
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 shielding patterns effectively reduce electromagnetic interference and smooth current flow, enhancing the performance of the battery pack and preventing performance deterioration of antenna transceiving units, allowing for seamless integration with electronic devices without location restrictions.
Implementation Method 1
At least one of the circuit patterns is a shielding pattern that shields at least a portion of electromagnetic waves generated by the protection circuit module
Data Source
AI summary
A battery pack providing power to a portable electronic device is disclosed which inhibits electromagnetic waves generated by the battery pack from interfering with the portable electronic device. The portable electronic device may include a radiofrequency (RF) circuit including a transceiver. The battery pack may include a battery cell and a protection circuit module (PCM) which operates to prevent the battery cell from overcharge/overdischarge and overheating. The PCM may include a substrate and a protection device mounted to the substrate. Electromagnetic waves generated when the protection device operates are shielded from the portable electronic device by a shielding layer formed on the substrate of the PCM. The substrate may include a plurality of circuit layers, each including a circuit layer, with the circuit layers in electrical communication with one another. A shielding pattern is formed on at least one of the circuit layers.