Lithium battery system for multi-path parallel connection and control method thereof

Abstract

The invention provides a lithium battery system for multi-path parallel connection and a control method thereof. The voltages among multiple paths can be kept consistent, the problems of circular current or large current impact and the like can be solved, and the service life of a battery can be prolonged. The lithium battery system comprises a BMS and a plurality of branch modules, and the branchmodules are connected in parallel. Each branch module comprises a lithium battery module formed by connecting single battery cells in series. The lithium battery system further comprises an equalization module, a charging module and a discharging module which are connected in parallel and are then connected with the BMS. The total positive end of the branch modules after parallel connection is connected with the BMS and one end of a node formed by parallel connection of the equalization module, the discharging module and the charging module, and the total negative end of the branch modules after parallel connection is connected with the BMS and the other end of the node formed by parallel connection of the equalization module, the discharging module and the charging module. Each branch module further comprises a fuse, a branch current sensor and a branch relay, wherein the fuse, the lithium battery module, the branch current sensor and the branch relay are sequentially connected in series, and the branch current sensor and the branch relay are both connected with the BMS.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium battery system for multi-channel parallel connection and a control method thereof. Background technique [0002] With the development of science and technology, lithium batteries have become the mainstream now. Lithium battery packs as an energy storage device usually include single cells or modules, electronic components, battery boxes and interfaces with other external systems; in practical applications Among them, the entire lithium battery pack is usually composed of several lithium battery modules. The lithium battery module is the smallest grouping of single batteries connected on the physical structure and circuit to form a battery pack or system, which can be replaced as a unit. [0003] However, with the increase of power demand, there are limitations in the increase of the capacity of single cells, so it is often necessary to connect multiple cells i...

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Problems solved by technology

[0004] In view of the above problems, the present invention provides a lithium battery system and its control method for multi-channel parallel connection, which can keep the voltage between multiple channels consistent, solve the problems of circulating current or large current impact, and prolong the service life of the battery

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