Kia Soul EV: High Voltage Battery Control System / Main Relay Description and Operation

Kia Soul EV (PS EV) 2015-2020 Service Manual / EV Battery System / High Voltage Battery Control System / Main Relay Description and Operation

Description
Main Relay is installed in the Power Relay Assembly (PRA) and it controls the high voltage line.
It connects the power between the high voltage battery pack and the high voltage joint box by the BMS ECU control signal.
But when the battery cell is swollen by overcharging, main relay and pre charge relay (PRA) are not operated by RAD.
The RAD is installed on each battery module and will not operate when the battery is normal.
[With High Voltage Battey Heater System]

1. Main Relay (+)
2. Main Relay (-)
3. Pre Charge Relay
4. Pre Charge Resistor
5. Battery Current Sensor
6. High Voltage Battery Heater Relay
7. High Voltage Battery Heater Fuse

[Without High Voltage Battery Heater System]

1. Main Relay (+)
2. Main Relay (-)
3. Pre Charge Relay
4. Pre Charge Resistor
5. Battery Current Sensor


Operation

Main Relay Specifications
Specification ItemSpecificationONRated Voltage (V)450Rated Ampere (A)200Voltage Drop (V)Less than 0.1 (200A)CoilOperation Voltage (V)12Resistance (?)21.6 ~ 26.4 (20°C) ItemSpecificationNo ...

Main Relay Schematic Diagrams
System Circuit Diagram With High Voltage Battery Heater System Without High Voltage Battery Heater System Circuit Diagram Without High Voltage Battery Heater System With High Voltage Batt ...

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