EMI-Shielded EV Battery Pack Layout for Compact EMC
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Solution Overview
Problem
Electric vehicles face challenges in achieving electromagnetic compatibility (EMC) due to compact electrical systems that are susceptible to both internally and externally generated electromagnetic interference (EMI), which can disrupt electronic components and compromise vehicle function.
Innovation Solution
A battery pack configuration with EMI shielding features, including metallic and carbon-based materials, layered circuit boards, and casing with EMI shields, designed to mitigate both internally and externally generated EMI, enhancing EMC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If electrical systems are made compact to reduce vehicle footprint, then space utilization is improved, but electromagnetic interference increases due to closer proximity of components
Solution Approach 1:
The battery pack is divided into distinct functional zones: a power electronics section containing the DC-DC converter, and a battery cell section. These segments are spatially separated and each enclosed in its own housing, reducing EMI coupling while maintaining compact overall dimensions.
Solution Approach 2:
EMI shielding materials are introduced as intermediary elements between the power electronics and battery cells. The shielding includes conductive barriers and grounded screens that block electromagnetic fields, allowing compact component placement without excessive EMI exposure.
2Quantity of substance
If power electronics components are placed close to battery cells, then energy density is improved, but electromagnetic compatibility deteriorates
Solution Approach 1:
The power electronics are nested within the battery pack housing in a compact arrangement, with the DC-DC converter positioned adjacent to battery cells. EMI shielding structures are integrated into the housing walls between these components, enabling high energy density while maintaining EMC through nested protective barriers.
Solution Approach 2:
The housing structure utilizes composite construction combining conductive EMI shielding materials with insulating and structurally supportive materials. This composite approach allows the housing to provide both mechanical support for high energy density and electromagnetic protection for reliability.
3Reliability
If EMI shielding is added to protect electronic components, then electromagnetic compatibility is improved, but device complexity increases
Solution Approach 1:
The battery pack housing serves multiple functions simultaneously: structural support, thermal management pathway, and EMI shielding barrier. This multi-functionality reduces overall device complexity by eliminating the need for separate dedicated EMI shielding structures.
Solution Approach 2:
The EMI shielding features are merged with the existing battery pack housing and component enclosures rather than being added as separate elements. The housing walls themselves are configured to provide shielding, and the electronics assembly casing integrates shielding surfaces, simplifying the overall structure.
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 reduces EMI interference, ensuring stable operation of electronic components and compliance with EMC standards, even in compact electric vehicle designs.
Implementation Method 1
at least one of the electronics assembly and battery pack housing includes an EMI shield to enable EMC
Implementation Method 2
The EMI shield comprises at least one of a metallic screen, metallic wires, a metallic tape, a metallic sheet, a metallic coating, paramagnetic materials, carbon based materials and metallic and/or carbon particle-infused composites
Data Source
AI summary
A battery pack with electromagnetic compatibility (EMC) for an electric vehicle is presented that includes a battery pack housing, at least one battery module enclosed within the battery pack housing, and an electronics assembly enclosed within the battery pack housing, in which the electronics assembly comprises a DC-DC converter and an electronics assembly casing, wherein at least one of the electronics assembly and battery pack housing includes an electromagnetic interference (EMI) shield to enable EMC. The electronics assembly includes a battery management system (BMS) circuit board and a DC-DC converter control circuit board and a DC-DC converter power electronics board. The electronics assembly is of substantially a same dimension of a battery module, in which the EMI shield comprises at least one of a metallic screen, metallic wires, a metallic tape, a metallic sheet, a metallic coating, paramagnetic materials, carbon based materials and metallic and/or carbon particle-infused composites.