Electric car modularization power system based on parallel connection of batteries and control method

Abstract

The invention discloses an electric car modularization power system based on parallel connection of batteries and a control method. The electric car modularization power system comprises a battery system and a motor control system, wherein the battery system comprises a power supply battery pack and a battery management system, the motor control system comprises an inverter and an inverting control module, the battery management system is used for managing, sampling and controlling the power supply battery pack, the power supply battery pack is connected to the inverter through a conducting wire, the inverter is used for inverting direct currents into three-phase electric power with adjustable voltage and frequency, which is supplied to a traction motor, and the inverting control module is used for controlling the inverter and is in communication with the battery management system through a bus; power supply batteries are connected in parallel, the power supply battery pack is divided into n groups, the n groups of batteries are respectively used for supplying power to the traction motor by adopting inverter circuits, and the motor control system is combined with the battery management system, and thus the standardization and the modularization of the power system are facilitated, and the management and the replacement of the batteries are convenient.

Description

Technical field [0001] The invention relates to an electric vehicle modular power system and a control method based on battery parallel connection. Background technique [0002] Existing electric vehicle power batteries generally use multiple batteries in series, and the traction motor uses a single inverter unit to perform control. [0003] In order to increase the voltage, a series of multiple batteries is generally used. Due to capacity limitations, a battery system with a series of power supply batteries needs to be a battery pack composed of a large number of cells in parallel and then connected in series. Although this method is relatively easy to implement, it does not require the management system. High, low cost, but more troublesome to maintain, and higher requirements for the performance consistency of each series battery pack, otherwise, the capacity of multiple batteries in series should be calculated according to the minimum capacity of the battery. Therefore, the cu...

AI Technical Summary

Problems solved by technology

[0008] The real battery management system (BMS) generally detects the single voltage, total voltage, total current, temperature and other parameters of the battery pack in real time, and protects and controls the battery pack from overvoltage, overcurrent, undervoltage, overtemperature and short circuit. , but the basic data measurement is limited to the system's own measurement and monitoring, and the protection control is mostly limited to the corresponding protection measures of the battery management system

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