Vehicle Battery Shielding Member for Electromagnetic Wave Cancellation
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Solution Overview
Problem
Current battery mounting structures using aluminum or resin cases have poor shielding performance against electromagnetic waves in the range of a few kHz to 10 kHz, leading to increased costs and weight due to the need for additional shielding measures at the vehicle body.
Innovation Solution
A battery mounting structure with a shielding member formed as an electrical loop, routed to overlap with cables connecting battery cells, effectively cancels out electromagnetic waves by generating counter electromotive force, reducing leakage and requiring minimal additional weight or cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a battery case is fabricated of aluminium or resin to reduce vehicle weight, then weight is reduced, but shielding performance against electromagnetic waves in the range of a few kHz to 10 kHz deteriorates
Solution Approach 1:
The shielding function is segmented from the battery case structure itself and implemented as a separate shielding member (conductive sheet or mesh) that is selectively applied only where electromagnetic wave leakage occurs, specifically at the cable penetration portions of the upper case
Solution Approach 2:
A shielding member acting as an intermediary component is introduced between the cable and the external environment to block electromagnetic waves. This intermediary element provides the necessary shielding function without requiring the entire battery case to be made of heavy shielding material
2Reliability
If shielding measures are employed at the vehicle body side to compensate for poor battery case shielding, then shielding performance is improved, but costs and weight increase
Solution Approach 1:
The shielding action is performed preliminarily at the source (battery case upper cable penetration portions) rather than at the destination (vehicle body). By preventing electromagnetic wave leakage at its origin point, the need for additional shielding measures elsewhere in the vehicle is eliminated
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 solution effectively suppresses electromagnetic wave leakage from battery cell groups, reducing the need for external shielding measures and minimizing weight and cost increments, while maintaining efficient electromagnetic interference cancellation.
Implementation Method 1
counter electromotive force is generated in the shielding member by noise currents flowing in the cable, and electromagnetic waves caused by the noise currents are canceled out by electromagnetic waves caused by the counter electromotive force
Data Source
AI summary
A battery mounting structure of a vehicle includes a battery case, a cable and a shielding member. The battery case includes a lower case and an upper case. In each of plural battery cell groups, plural battery cells are arrayed in a first direction. The battery cell groups are accommodated in the battery case in a state in which the battery cell groups are arrayed along a second direction, which is orthogonal to the first direction in plan view. The cable is routed at an upper face side of the battery cell groups so as to connect the battery cells in series. The shielding member is configured by a conductor so as to form an electrical loop, and is provided at the upper case so as to be overlapped with at least a portion of the cable in plan view.