A multi-cluster parallel battery system and its safety management method

Abstract

The invention relates to a multi-cluster parallel battery system and a safety management method thereof. For the multi-cluster parallel battery system, by optimizing the multi-cluster parallel battery system architecture and configuring an in-situ layered battery management system according to the multi-cluster parallel battery array, Combining the protection characteristics of cluster relays and DC circuit breakers with electric operating mechanisms, multi-level battery safety protection can be realized to avoid battery safety problems caused by external environment or failure of partial equipment control. For the management method, in order to make up for the shortcomings of single-dimensional judgment of battery failure, a multi-dimensional fault judgment method is designed to comprehensively evaluate the safety status of the battery and implement different safety management strategies.

Description

technical field [0001] The invention relates to the technical field of battery energy systems, in particular to a multi-cluster parallel battery system and a safety management method thereof. Background technique [0002] With the improvement of lithium-ion battery performance and the reduction of cost, lithium-ion batteries have been widely used in electric aviation, electric energy storage, electric vehicles and other fields. A single lithium-ion battery is difficult to use alone in a large-scale battery system due to low voltage platform and limited energy. In general, thousands of single batteries are connected in series, parallel or mixed. to meet different application requirements. The multi-cluster parallel battery system can easily meet the design requirements of a large-capacity battery system and meet the requirements of higher safety redundancy. It has been widely used in scenarios such as electric energy storage, electric aviation, and electric buses. [0003] ...

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Problems solved by technology

[0005] In addition, the current judging method for battery safety uses a single parameter or real-time information of parameters to judge, such as determining thermal runaway by judging the temperature exceeding the limit, and judging overcharging by judging the voltage of the single cell exceeding the upper limit, but the characteristics of the battery cell are very complicated. It is difficult to accurately describe the safety state of the battery by relying on only one dimension. It is necessary to comprehensively consider different battery parameters, historical information of battery parameters, and parameter change information to ensure the effectiveness of fault discrimination.

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