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When using rechargeable lithium-ion cells in large batteries, such as those in an electric vehicle, unique problems can be encountered.
Bus voltages greater than 100V preclude the use of a standard IC for overcharge and overdischarge protection. In addition, because many cells connect in series, small differences in cells’ self-discharge rates eventually lead to unequal levels of charge.
This design idea for electrical engineers provides one solution for protecting and balancing large, high-voltage batteries.
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