Multi-in-One Electric Drive

The multi-in-one electric drive system is a pivotal technological pathway in the new energy vehicle (NEV) powertrain sector. Through a highly integrated modular architecture, this technology deeply consolidates core powertrain hardware such as the drive motor, motor control unit (MCU), and reduction gearbox, alongside power electronics including the on-board charger (OBC), DC-DC converter, power distribution unit (PDU), vehicle control unit (VCU), and even the battery management system (BMS), into a single, highly compact powertrain assembly.

Core Working Principle and Technical Characteristics

The essence of the multi-in-one electric drive lies in "hardware sharing, software integration, and optimal packaging efficiency": 

Deep integration of high-voltage and powertrain domains: Conventional electric drive layouts feature standalone, dispersed modules that depend on extensive high-voltage wiring harnesses and connectors for signal and power transmission. By sharing housings, eliminating redundant wiring, and adopting shared-substrate designs, the multi-in-one electric drive integrates high-power electronic units like inverters and on-board chargers directly with the motor and reduction gearbox, substantially cutting internal energy transmission losses. 

Lightweight build and high power density: By adopting advanced hairpin flat-wire windings, lightweight alloy casings (such as aluminium or magnesium alloys), and combined oil-and-water cooling technology, the multi-in-one electric drive drastically reduces physical dimensions and weight while enhancing overall heat dissipation and operational efficiency across driving cycles.

Application Scenarios and Market Value

Multi-in-one electric drive systems are widely utilised in mainstream battery electric vehicles (such as A-segment and B-segment sedans and SUVs) as well as various electrified passenger vehicles.

In an intensely competitive NEV market, the multi-in-one electric drive has become an essential tool for carmakers aiming to reduce costs and boost efficiency. Beyond lowering vehicle bill of materials (BOM) costs and streamlining supply chain and assembly line processes, it reduces front-bay weight and frees up extra cabin or front trunk (frunk) space, directly improving driving range and interior packaging efficiency.

Safety Specifications and Physical Limitations 

It is strictly prohibited to operate the vehicle under heavy load or high power output if the electric drive cooling lines are damaged, leaking, or if the coolant circulation pump has failed:

Because the multi-in-one electric drive houses multiple high-heat-generating components (such as the motor controller, inverter, and on-board charger) within a tight enclosure, a cooling failure can trigger rapid localised heat build-up. This can cause power semiconductors (such as IGBT or SiC modules) to suffer thermal breakdown from overheating, potentially leading to catastrophic electrical faults. 

Unauthorised personnel or technicians without high-voltage (HV) certification are strictly prohibited from dismantling or removing the high-voltage junction cover plates on the multi-in-one electric drive:

The multi-in-one assembly integrates the vehicle's highest-voltage busbar system and holds significant electrical energy. Without strictly following high-voltage isolation protocols, voltage-free verification, and proper discharge procedures, unauthorised contact with internal circuits carries an extreme risk of fatal electrocution.