The difference between the lithium battery MOSFET and the relay mainly includes the following aspects :
Working Principle
MOSFET : MOSFET is an electronic switch that regulates the electrical conductivity of a channel by controlling the gate voltage. When the gate voltage is high enough, the MOSFET is in the on-state. The MOSFET is off when the gate voltage is below a certain threshold.
Relay : Relay is an electromagnetic switch that uses electromagnetic force to make or break a circuit from a mechanical contact. When the control current or control voltage through the relay changes, the contact status changes accordingly .
Response Speed
MOSFET : MOSFET response speed is very fast, usually in the nanosecond level, can achieve high frequency switching operation, generate PWM wave.
Relay : Because of the mechanical structure of the relay, its response speed is slow, usually in the millisecond level.
Durability
MOSFET : MOSFETs have no mechanical parts, so there are no wear problems, and generally last longer than relays.
Relay : relays use mechanical contacts, frequent switching operation for a long time may lead to contact wear and poor contact, thus affecting its life and reliability.
Control current/voltage
MOSFET : The control current or voltage of MOSFET is relatively small, usually only requires microampere level current or a few volts to achieve switching operation 1.
Relays : relays usually require a large control current or voltage to activate the electromagnetic coil to enable the contact to switch operation.
Application scenario
MOSFET : Because of its fast response, low power consumption and reliability, widely used in digital circuit, power amplifier, integrated circuit and other fields.
Relay : Because of its mechanical contact characteristics, suitable for some high current and high voltage requirements of high application scenarios, such as power system, high power equipment.
In summary, the choice of MOSFETs and relays in lithium battery applications mainly depends on the specific needs. If you need fast response and high-frequency switching operation, MOSFET is a better choice. If you need to control high currents and high voltages, relays are more suitable.
