Power battery management system of electric car

Abstract

The invention discloses a power battery management system of an electric car.The power battery management system comprises a power battery pack, a center power management system (CBMS) and a plurality of sub battery management systems (SBMSs).The sub battery management systems (SBMSs) comprise unit voltage detecting circuits, temperature detecting circuits and balance circuits connected with battery cells respectively.The sub battery management systems (SBMSs) exchange information through CAN communication circuits, and the information is reported to the center power management system (CBMS) through the CAN communication circuits.The power battery pack is connected with a main current detecting circuit, a main voltage detecting circuit and an insulation detecting circuit.Each battery cell is provided with one independent sub battery management system (SBMS), the whole battery system is provided with the center power management system (CBMS), one CBMS and an arbitrary number of random SBMSs form one battery management system, the CBMS can automatically adapt to the new battery number, capacity, battery states and the like by increasing or reducing or replacing the SBMSs, and unique advantages are achieved on a battery system in an alternating current mode.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to an electric vehicle power battery management system. Background technique [0002] With its many advantages, such as high energy density, high voltage platform, and no heavy metal pollutants, lithium-ion batteries have become the main force of mobile power and power batteries. However, lithium-ion batteries are also quite delicate, and their chemical characteristics determine that their operating voltage has strict upper and lower limits, and the charging and discharging power characteristics have a great correlation with temperature and state of charge. When applied to electric vehicles, various overcharge and overdischarge, overheating, collision extrusion, puncture, etc. will not only lead to rapid damage to the battery, but may also cause safety accidents. Therefore, it is necessary to develop a good battery management system to protect the battery. indispensable. ...

AI Technical Summary

Problems solved by technology

The above-mentioned management system will lose its function due to a single point of failure, and it is difficult to guarantee the functional safety. Moreover, if a part of the battery managed by a slave is replaced, it is difficult to effectively manage the charge and discharge.

Especially the battery system in battery swapping mode, this kind of management system cannot be used at all

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