Difficulties Of Short - Circuit Protection For Lithium Iron Phosphate Batteries

- Jan 23, 2017 -

(1) short-circuit current: In electric vehicles, lithium iron phosphate battery voltage is generally 36V or 48V, short circuit current with the battery capacity, internal resistance, parasitic inductance of the circuit, short-circuit contact resistance changes, Hundreds or even thousands of amps.

(2) short-circuit protection time can not be too short: in the application process, in order to prevent transient overload of the short circuit protection circuit malfunction, therefore, short circuit protection circuit has a certain delay. This requires the MOS tube in the high-power short-circuit current, in the safe operation of time, which greatly improve the system design difficulty.

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