Vehicle battery current and voltage detection equipment based on isolated coupler

Abstract

The invention relates to vehicle battery current and voltage detection equipment based on an isolated coupler. A voltage detection unit collects battery voltage signals of electric cars and sends thebattery voltage signals to a controlling and data processing unit; a current detection unit collects battery current signals of the electric cars and sends the battery current signals to the controlling and data processing unit. Signal and power source isolation of a high-low voltage isolating unit is realized through a high-isolation DC-DC converter and the high-isolation digital coupler. The controlling and data processing unit processes the current and voltage signals, controls all the units to operate and transmits data to a high-speed CAN bus. The vehicle battery current and voltage detection equipment has the advantages that the voltage detection unit and the current detection unit are independent from each other, so that detection distance is shortened, influences of external interference on signal detection are reduced, and detection accuracy and BMS reliability are improved; the vehicle battery current and voltage detection equipment is transferred to a high-voltage power distribution unit at a high-low voltage junction and is integrated with hardware resources of a high-voltage power distribution system, and accordingly, cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of a battery management system (BMS), and relates to a vehicle battery current and voltage detection device based on an isolation coupling device. Background technique [0002] In recent years, with the increasing popularity of electric vehicles, the length of battery life determines the long-term development of electric vehicles in the future. Efficient and accurate battery current and voltage detection can effectively optimize battery use, thereby effectively extending battery life. The optimization of the battery can also greatly improve the safety factor of the vehicle, so the current and voltage detection of the electric vehicle battery is particularly important. [0003] At present, the BMS of many electric vehicles on the market integrates all current and voltage detection within the BMS, such as the EV1 battery management system developed by General Motors of the United States, the BATTMAN battery ma...

AI Technical Summary

Problems solved by technology

BMS is the core module of electric vehicles, and has high requirements for isolation. Some abnormal phenomena in the high-voltage detection unit of the BMS, such as overcharge and high-voltage discharge, are likely to cause damage to the BMS. In the BMS, the signal detection path is relatively long, and it is susceptible to electromagnetic interference in the complex electromagnetic environment of the car body

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