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Automotive pre-charge resistors are electrical components specifically designed for automotive electronic systems, primarily used in the pre-charging process of battery management systems (BMS) and power circuits. They prevent circuit damage caused by excessive instantaneous current by gradually providing current during battery or capacitor charging. Pre-charge resistors feature high power handling capacity, high temperature resistance, and shock resistance, effectively protecting the vehicle's battery system from current surges. Their high durability and reliability allow for stable operation even under prolonged, high-load conditions, making them particularly suitable for battery management systems in electric and hybrid vehicles.
Horizontal terminal
II. Product Dimensions
Item
Dimensions
Product Type
Pre-charge Resistor (Automotive)
Body Size
90mm (length) x 18mm (width) x 20mm (height)
Span
70mm ±1mm
Terminal Height ( standard terminals )
9mm ± 0.5mm
Terminal Height ( horizontal terminals )
12mm±1mm
Terminal Height ( short terminals )
5.5mm±0.5mm
III. Performance Characteristics
High Power Load and Heat Dissipation Capacity This resistor features a ceramic housing design, providing excellent heat dissipation. It can handle high power loads for short periods, ensuring a gradual increase in current during charging and preventing instantaneous overload on the battery or circuitry.
High Temperature Resistance and Long Lifespan With a wide operating temperature range, up to 200°C, it exhibits excellent high-temperature resistance, adapting to the high-temperature operating environments of vehicle batteries and charging equipment. Simultaneously, it possesses good long-term stability and high durability, providing long-term reliable protection.
Customized Design Resistance values, power ratings, and terminal types can be customized according to customer needs to meet the specific requirements of different vehicle systems, such as battery charging current control and system voltage protection.
Short terminal
IV. Application Areas
Electric Vehicles and Hybrid Vehicles Pre-charge resistors are widely used in the battery management systems of electric vehicles and hybrid vehicles to ensure a smooth current transition during battery charging, preventing damage to the battery pack from instantaneous current surges.
On-board Charging Systems In on-board charging equipment, pre-charge resistors play a role in current limiting and protection, ensuring safety during the charging process and preventing damage to the equipment due to excessive current.
High-Power Battery Management Used in Battery Management Systems (BMS) to perform gradual current control during battery charging, ensuring the stability and long-term reliability of the battery system.
On-board Power Systems In on-board power equipment (such as inverters and chargers), pre-charge resistors are used for overload protection and voltage control, ensuring stable system operation.
High-End Automotive Electronic Equipment In high-end automotive electronic equipment, such as car audio systems and navigation systems, pre-charge resistors prevent damage to the circuitry from instantaneous voltage fluctuations.
