A decentralized logic battery management system and its energy management method

Abstract

The invention discloses a distributed logic type battery management system and an energy management method thereof and belongs to the technical field of power batteries of electric automobiles. The distributed logic type battery management system comprises a battery control unit (BCU), M battery management units (BMU), a CAN network inside the battery management system (BMS) and an auxiliary electricity high-voltage bus. The battery management system is used for managing a power battery pack; the power battery pack comprises M battery modules; each battery module is formed by series connectionof N single batteries; each BMU comprises a controller, a first-stage equalization module and a second-state equalization module; the BCU corresponds to the power battery pack; in the M BMUs, the BMUs are in one-to-one correspondence with the battery modules, and devices in each BMU are directly electrified by the corresponding battery module; and each second-state equalization module comprises abidirectional convertor, and the output ends of the bidirectional convertors are electrically connected with the auxiliary electricity high-voltage bus. The distributed logic type battery managementsystem is easy to extend and high in safety, a traditional accumulator-assisted power source is omitted through function reusing of the bidirectional convertors in the second-state equalization modules, and accordingly the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle power batteries, and more specifically relates to a decentralized logic battery management system and an energy management method thereof. Background technique [0002] Traditional fuel vehicles have seriously affected energy security, and their exhaust gas and noise have also caused serious pollution to the urban environment, posing a serious threat to the ecological environment. In order to save resources, protect the environment, and meet the needs of social sustainable development strategies, new energy vehicles have become the focus of attention all over the world. Among them, pure electric vehicles have become the development focus of major automobile companies in the world, and there are still many problems to be solved urgently in the development of pure electric vehicles. [0003] From the perspective of power batteries, the inconsistency of battery packs is a difficult problem ...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above defects or improvement needs of the prior art, the present invention provides a decentralized logic battery management system and its energy management method, thereby solving the problem of high transfer cost of existing systems in the prior art, difficulty in expansion, and inability to transfer power Technical issues of battery pack reuse

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