C h a p t e r 3 | C e l l B a l a n c i n g
Key Points
• In large-format battery packs like those in EVs, the
performance of the entire pack is limited by the
SOC of the weakest cell, necessitating effective
management strategies.
• Cell balancing, essential for optimizing battery
pack performance, equalizes the SOC of each cell
or cell group, overcoming limitations imposed by
weaker cells.
• Passive cell balancing, a simple and cost-effective
method, uses power resistors and MOSFETs to
bypass cells with higher SOCs; however, passive
balancing is inefficient due to energy waste and
reduced battery life.
• Active cell balancing transfers energy between
cells using capacitors or inductors for more
efficient SOC equalization, albeit at a higher
complexity and cost.
• Vishay provides components for both active and
passive cell balancing, focusing on balancing
power density, size, efficiency, and cost—crucial
for applications like EVs.
IHLP
®
Power
Inductors
SQ Automotive Power
MOSFETs
RCL Series Thick Film Chip
Resistors
MMx Professional Series MELF
Resistors
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17
8 Industry Experts Discuss Battery Management Solutions
