Application of DC relay in new energy automobile industry

Dc Relays achieve circuit on-off through electromagnetic drive, which needs to meet the following requirements in new energy vehicles:
✅ High voltage load: The working voltage range is extended to 400V-800V
✅ High current control: continuous current carrying capacity exceeds 250A
✅ Fast response: the operation time is reduced to less than 15ms

Four core application scenarios of new energy vehicles

1. Battery Management System (BMS) protection

Pre-charge loop control: Prevent capacitance surges through time-current curve management (typical parameters: 10Ω pre-charge resistance +50ms delay)
Overcurrent/short circuit protection: Response speed ≤20ms, faster than the fuse 100ms threshold (according to GB/T 31485 standard)

2. Dc fast charge system
Charging gun connection confirmation: Charging handshake protocol via CC/CP signal relay (according to CHAdeMO/CCS standard)
Bidirectional charge and discharge control: Relays that support V2L/V2G must have bidirectional current carrying capacity

3. Electric drive system protection
IGBT module protection: Cut off the circuit within 3ms when the motor is blocked (prevent exceeding the junction temperature limit of 150℃)
Multi-channel parallel design: For example, Tesla Model 3 adopts 4-channel parallel relay, and the total carrying current reaches 1200A

4. High Voltage Distribution Unit (PDU)
Intelligent power distribution management: Integrated CAN bus communication (baud rate 500kbps) to achieve real-time status monitoring
Lightweight design: Aluminum substrate replaces copper, reducing weight by 35%