THERMAL MANAGEMENT
signal lines to suppress high-frequency noise; use EMI fi lters to attenuate emissions
4. Electromagnetic shielding of sensitive components: Shield sensitive components like communication lines, sensors and BMS using shielded cables or small shields to protect from radiated EMI.
Mitigation techniques for Conducted Emissions (CE)
Conducted Emissions are electromagnetic energy traveling through power or signal lines, potentially interfering with systems on the same network or power grid. The following techniques can help reduce conducted emissions in BESS. 1.
Grounding and shielding: Implement proper grounding and use shielded cables for power and signal lines to reduce noise interference
2. Twisted pair wires: Use twisted-pair wires for signal transmission to cancel induced EMI, improving noise immunity and reducing interference between conductors
3. PCB design: Proper PCB layout minimises noise; use separate ground planes for analogue, digital and power circuits to prevent coupling
4. Reducing switching noise: Use snubber circuits and soft-switching techniques in power supplies to reduce high- frequency noise during switching
5. Use of EMI-rated connectors and cables: Use connectors and cables with built-in shielding and grounding, ensuring they are rated for the relevant frequency range to minimise EMI
6. Power line fi ltering: Install power line fi lters, like pi-fi lters or LC fi lters, on input and output lines to block high-frequency noise using inductors and capacitors for wide-frequency attenuation.
Fig.2: EMI & EMC Effects on Battery Storage Devices
EMI Filters for BESS: EMI fi lters are essential for ensuring Electromagnetic Compatibility (EMC) and regulatory compliance in BESS. Selecting the right EMI fi lters for BESS is a key aspect of ensuring reliable, safe and compliant operation. By considering factors like frequency range, current and voltage ratings, noise source identifi cation, environmental conditions and compliance
with EMC standards, you can choose fi lters that protect your system from interference, enhance performance and extend component longevity.
EMI Filter Placement in BESS: •
The EMI fi lter should be placed as close as possible to the interference source or affected circuit to minimise EMI path length and improve effectiveness. Typically, fi lters are installed on power input lines (AC/DC) to fi lter conducted and radiated interference. Correct installation minimises loop areas, preventing EMI radiation from large loops.
• Fig.3: Impact of Using EMI Filter in Battery Energy Storage Systems
By ensuring good isolation between the input and output of the EMI fi lter, you can achieve effective EMI suppression, protect sensitive equipment and maintain system performance. By strategically placing EMI fi lters in the mentioned key locations within a BESS, the system can operate effi ciently, complying with EMC regulations and avoiding interference with sensitive electronics.
FEBRUARY 2026 | ELECTRONICS FOR ENGINEERS 19
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