Equalizing device and method of battery management system

Abstract

The invention relates to an equalizing device of a battery management system, which comprises a bypass unit, wherein the bypass unit comprises a plurality of bypass devices, at least one part of the bypass devices are energy storage and energy conversion devices, preferably, the energy storage and energy conversion devices can be fans, super capacitors or quadratic chemical power sources, the bypass devices are used in an individual, parallel connection or parallel and series connection way, and the bypass unit also comprises a bypass indicating unit, a switch matrix unit, a battery unit, a data information acquisition unit and a central control unit. The invention also provides an equalizing method of the battery management system; through the invention, the equalizing efficiency is greatly improved under an equal condition, thereby not only shortening the equalizing time, but also satisfying the requirement for automatic and full heat dispersion of a power resistor. The invention enables the heat dispersion and the equalization of the system to be automatically realized without individually providing radiating device, can fully reduce the temperature of an equalizing system, and enables the case and bag design of a battery pack to be simpler and easier to operate and the productionization and the practicalization of a battery system to be further improved.

Description

technical field [0001] The invention relates to the technical field of energy storage power battery systems, in particular to the technical field of equalization of energy storage power battery systems, and specifically refers to a battery management system equalization device and method. Background technique [0002] Facing the huge pressure of energy and environment, people in the 21st century are constantly looking for clean alternative fuels to improve the deteriorating status of traffic emissions. Energy conservation and emission reduction has become a topic of common concern all over the world. Electric vehicles are the key to energy conservation and emission reduction An important means has gradually become the focus of governments and automakers. Therefore, various countries and large automobile manufacturers also regard electric vehicles as the focus of research. According to the national conditions of our country, in order to alleviate the pressure of urban traffi...

AI Technical Summary

Problems solved by technology

[0003] At present, as one of the core components of electric vehicles, the battery system is not very mature compared with the motor and motor control technology, and there are still many practical problems: such as the low volume and mass specific capacity of the power battery, which makes the electric vehicle The driving range is short; the specific power of the power battery is low, which leads to poor power performance of the car; the charging time of the power battery is long, and even if the fast charging technology is used, it is impossible to complete it in a few minutes like refueling an internal combustion engine vehicle, which also makes the vehicle The promotion of electric vehicles has been severely challenged; it is particularly worth mentioning that due to the inconsistency of the performance of each single battery in the battery system, the performance index of the power battery pack on the electric vehicle is far from the original level of the single battery. The service life is shortened several times or even ten times. This result seriously affects the performance of electric vehicles and the cost of batteries, which largely determines the cost performance, marketing mode, development process and market of electric vehicles. progress

Non-energy equalization is divided into bidirectional flyback, coaxial transformer, and bidirectional DC-DC equalization, etc., but due to the difficulty and cost constraints of the manufacturing process, although technical personnel in this field have done a lot of research and exploration, so far it has not been possible to realize its true Productization and practicalization of

Images