A shared power supply system for pure electric vehicles

Abstract

The invention relates to a shared power supply system for pure electric vehicles. The first battery box and the second battery box of two relatively independent battery packs are comprehensively processed through the high-voltage power distribution system PDU, and the high-voltage power supply is converted by DC / DC inverter mode. A low-voltage power supply is used to supply power for low-voltage equipment, and the separate power supply for low-voltage power supply (such as 12 / 24V lead-acid battery) is removed. The static power supply of capacitors is installed in the PDU of the vehicle controller, and DC / DC is driven by pulse signals to control DC / DC. The on-state and power of the DC can accurately supply power for high-voltage or low-voltage equipment. After the DC / DC is powered on, it can drive the vehicle-mounted low-voltage power distribution system, BMS, and high-voltage power distribution system until the vehicle is driven by the CAN network signal of the vehicle controller. Work, the comprehensive treatment of two relatively independent battery packs in the whole vehicle, remove the separate power supply (such as 12 / 24V lead-acid battery) for low-voltage power supply, and use DC / DC inverter to power low-voltage equipment, which can reduce a set of low-voltage power supply The power supply provides benefits for the lightweight of the whole vehicle and the integration of equipment.

Description

technical field [0001] The invention relates to the field of electric vehicles, in particular to a power supply for electric vehicles, in particular to a shared power supply system for pure electric vehicles. Background technique [0002] The high-voltage power supply system and low-voltage auxiliary system of pure electric vehicles currently on the market and newly developed are processed separately, that is, the high-voltage system (such as a 450V lithium battery pack) is powered by a separate battery pack, and the low-voltage battery pack is a separate power supply (such as 12 / 24V lead-acid battery) power supply processing. Pure electric vehicles have many low-voltage control and execution accessories. After the vehicle is powered off, many devices are in a dormant state. When the vehicle equipment is processing the dormant state, such as vehicle terminals, BMS, HVU, etc., continue to work and generate static current. Generally, a pure electric vehicle After a period of ...

AI Technical Summary

Problems solved by technology

Pure electric vehicles have many low-voltage control and execution accessories. After the vehicle is powered off, many devices are in a dormant state. When the vehicle equipment is in a dormant state, such as vehicle terminals, BMS, HVU, etc., continue to work and generate static current. Generally, a pure electric vehicle After a period of time, it will not start (the low-voltage power supply is exhausted)

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