Battery management system of vehicle-mounted lithium power battery

Abstract

The invention discloses a battery management system of a vehicle-mounted lithium power battery. The system includes a master control unit and slave control units. The master control unit is in communication connection with the multiple slave control units through a data bus. The master control unit is in connection with battery groups, the total voltage and total current of which are acquired. The master control unit is also connected to a DC power supply, and is in connection with a charger through an external CAN bus. The master control unit mainly includes: a master microcontroller module, a total voltage detection module, a total current detection module, a battery system insulation detection module, a battery operating environment temperature detection module, a relay driving module, a data storage module, a bus communication module, an isolated power supply module, and a physical interface module of power supplies, data, signals, etc. The system provided in the invention has the advantages of simple structure, strong expansibility, and adaptability to different numbers of batteries. Being fully functional, the system has the functions of temperature control, equalization processing, battery performance evaluation, and battery self-protection, etc.

Description

technical field [0001] The invention belongs to the field of power battery management systems, in particular to a battery management system for a vehicle-mounted lithium power battery. technical background [0002] With the increasingly prominent energy problems of economic development and the gradual enhancement of people's awareness of environmental protection, the development of new energy vehicles, especially electric vehicles, has become the consensus of the people and is the main development direction in the future. As the most important energy source of the power battery, it is very important that it can be used safely, stably and for a long time. However, in the process of use, the collective management includes the detection of a series of parameters such as the charging and discharging current, voltage, temperature of the battery in actual use and the equalization among batteries is a worldwide technical problem. Therefore, a battery management system adopting a m...

AI Technical Summary

Problems solved by technology

However, in the process of use, the collective management includes the detection of a series of parameters such as the charging and discharging current, voltage, temperature of the battery in actual use and the balancing process between the batteries is a worldwide technical problem

Therefore, a battery management system adopts a master-slave type, which can be adapted to a small-scale application of a small number of batteries, and can also be expanded to a battery management system for a large number of power batteries.

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