Rechargeable distributed control battery system and working method thereof

Abstract

The invention belongs to the technical field of battery packs, and discloses a rechargeable distributed control battery system, which comprises a battery management system main control unit, a charging and discharging integral interface, a plurality of battery clusters and a plurality of DC-DC bidirectional converter modules, each battery cluster is formed by connecting a plurality of battery modules in series, each battery module is connected with a battery management system slave control unit, each battery module is provided with a DC-DC module, clustering management is carried out by adding the DC-DC module to a single battery module, and the DC-DC bidirectional converter module is externally arranged in a vehicle or a charging station. Meanwhile, the battery pack is provided with a battery management system main control unit, the states of batteries in the battery modules are monitored and predicted in real time, the battery management system main control unit is used for controlling on and off of the DC-DC modules, switching independent control over the single battery modules is achieved, the purpose of higher-granularity fine management is achieved, the availability rate of the batteries is increased, and the influence of battery inconsistency on the operation process is reduced.

Description

technical field [0001] The invention belongs to the technical field of battery packs, and in particular relates to a rechargeable distributed control battery system and a working method thereof. Background technique [0002] The difference between electric mining trucks and ordinary passenger cars is that they have relatively large power, generally about 500kWh, which is similar to the single energy storage scale of fixed power stations. After connecting in parallel, but this approach often brings many disadvantages, such as the inconsistency between battery clusters leads to short board effect of the battery, resulting in a decrease in available power and a smaller actual charge and discharge capacity. At the same time, it is easy to cause serious inaccuracy in SOC estimation and cause battery life anxiety. [0003] Patent CN201721423210.7 discloses a series-parallel battery pack system with a limp function, in which multiple sets of battery packs are connected in parallel...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a rechargeable decentralized control battery system and its working method, which solves the problem that when a single battery module fails, the entire battery cluster in series needs to be withdrawn, resulting in a large capacity loss; the battery cluster is inconsistent due to voltage Cause problems such as short plate effect or battery circulation

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