Battery management system for electric automobile

Abstract

The present invention discloses a battery managing system for electromotive vehicle, which includes: a plurality of the monitors. Each monitor takes the sample for the voltage and temperature of a single battery or a plurality of the single batteries; a main controller which is used for receiving the voltage and temperature data emitted by the sub-monitor, and analyzing the data to realize the balance controlling for the battery, and simultaneously finish the communication with the whole vehicle controller. The main controller and a plurality of the sub-monitors are connected with each other in parallel by the plastic fiber, to form a loop circuit structure. Using the battery managing system with the structure, the main controller and the sub-monitor are connected with each other in parallel by the plastic fiber, to completely eliminate the potential safety hazard and the electromagnetic interference caused by the communication wires are distributed in the high voltage net of the pilewith a large area.

Description

technical field [0001] The invention relates to a battery management system, in particular to a power battery management system of an electric vehicle with a high-power battery pack as a power source. Background technique [0002] As human beings pay more attention to the environment, electric vehicles, as a non-polluting means of transportation, have attracted more and more attention and have a good development prospect. The power battery is the core component of electric vehicles, which directly affects the performance and safety of electric vehicles. The power battery includes two aspects: a high-power battery pack and a battery management system. A high-power battery pack refers to a battery pack with an output voltage greater than 50V and a capacity greater than 400Wh. Lead-acid batteries, nickel metal hydride batteries and lithium-ion batteries can all be used in electric vehicles. Among them, lithium-ion batteries are widely used in electric vehicles because of the...

AI Technical Summary

Problems solved by technology

Since the electric vehicle uses a high-power battery pack, the output voltage is greater than 50V, so there are two defects in the communication line connected by wires: 1. The battery management system is easily interfered by the high-voltage signal of the battery pack

2. The wires of the communication line are distributed in a large area in the high-voltage network of the entire battery pack, and there are electromagnetic interference and high-voltage hidden dangers

When used in series, the uneven performance of single cells will affect the performance and life of the entire battery pack: during the charging process, when a single cell reaches the upper limit voltage, the charging circuit will be cut off, so that other single cells cannot be charged. Fully charged; during the discharge process, when a single battery reaches the lower limit voltage, the discharge circuit will be cut off, so that the energy of the entire battery pack cannot be fully utilized

At the same time, the performance difference between single cells will increase as the number of times the battery pack is used increases, shortening the service life of the battery pack

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