Cascaded battery management system

Abstract

The invention relates to a cascaded battery management system. The cascaded battery management system comprises a cascaded signal acquisition balanced protection circuit, a voltage and temperature processing circuit, a current acquisition circuit and a data processing and communication circuit, wherein the cascaded signal acquisition balanced protection circuit is used for respectively acquiring a voltage signal of each battery of a battery pack to the voltage and temperature processing circuit, the data processing and communication circuit is used for respectively acquiring a voltage / temperature signal, processed by the voltage and temperature processing circuit, of each monomer battery and current information, acquired by the current acquisition circuit, of a battery loop during charging and discharging so as to achieve charge state estimation of the battery, voltage balance of each monomer battery and protection on overtempeature, low temperature, undervoltage, overvoltage, overcharging, over-discharging and the like, and meanwhile, the battery information is interacted with a vehicle-mounted center control system through the data processing and communication circuit.

Description

technical field [0001] The invention relates to a cascaded battery management system, belonging to the technical field of power battery applications. Background technique [0002] Today, with the increasing shortage of energy resources and the intensification of environmental pollution, the global automotive industry is facing the huge challenge of product retention and technological innovation. At this stage, with the improvement of the overall living standard, more and more vehicle exhaust emissions undoubtedly aggravate the global air pollution and the more and more frequent smog weather to a certain extent. The use of efficient and clean energy to replace traditional power sources will become the main aspect of vehicle power reform. Therefore, accelerating the electrification of vehicle power systems has become a top priority for all countries to alleviate energy and environmental problems. As a traditional energy storage power supply equipment, the use of batteries has...

AI Technical Summary

Problems solved by technology

Traditional battery management systems are mostly centralized battery management systems with relatively low cost, but there are many connections, signal acquisition is seriously disturbed, the reliability of the management system is greatly reduced, and different numbers of battery packs need to be designed separately. The scalability is extremely poor; at the same time, the battery management system measures the temperature of each battery in the battery pack by detecting the temperature of the battery pack or the temperature of certain single cells, which has a large error and cannot perform over-temperature protection for each single cell , the improvement method is to adopt a distributed acquisition scheme. The temperature acquisition of each battery adopts a bottom control board, which is connected to the main controller through the CAN bus. This method avoids the phenomenon that the single battery temperature detection error is large, but The cost is too high and the underlying control board is underutilized

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