Intersil protects and controls Li-ion batteries for scooters

Intersil has announced a battery pack monitor/protector for 3-8 cell Li-ion cells, which also works with other battery chemistries.

Inteded for medium-power applications – mobility scooters, wheelchairs, e-bikes, hand tools, and vacuum cleaners; ISL94203 includes cell-by-cell control of external mosfet-resistor pairs for active cell balancing, as well as pack protection against short circuit and cell voltage shorts.

Unusual features include an open wire check to ensure the IC is securely connected to the battery pack, and a protection feature that blows a polyfuse to render the battery pack inoperable in the event of a catastrophic failure. And it can withstand battery pack hot plugging.

It operates with a microcontroller, or stand-alone with an internal state machine that has five pre-programmed cell handling stages to extend battery operating life.

Power rail switching is on the positive side, using n-fets and a charge pump, to allow customers to ground reference the battery.

Suitable for Li-ion CoO2, Li-ion Mn2O4, Li-ion phosphate and more.

There is an evaluation kit, ISL94203EVKIT1Z, which includes a device board, an interface board with USB to I2C interface, and a software GUI for stand-alone or microcontroller operation.

 

 

steve bush

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