Energy storage system and current sharing method thereof

A technology of energy storage system and balancing current, applied in charge balancing circuits, secondary battery repair/maintenance, electrochemical generators, etc. Effect

Active Publication Date: 2021-11-02
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the above two methods, the relay needs to be switched multiple times, and each time is a load operation, which greatly affects the life of the relay, and at the same time, it is easy to cause safety accidents due to relay adhesion.

Method used

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  • Energy storage system and current sharing method thereof
  • Energy storage system and current sharing method thereof
  • Energy storage system and current sharing method thereof

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Embodiment Construction

[0053] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0054] In this application, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes none. other elements specifically listed, or also include elements inher...

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Abstract

The present invention provides an energy storage system and a current sharing method thereof. The energy storage system includes: X current sharing units and X battery clusters, wherein: in each current sharing unit, the first end of the uppermost DC / DC converter It is connected to the DC bus bar of the corresponding battery cluster, the second terminals of the Y lowest-level DC / DC converters are respectively connected to the corresponding battery packs of the corresponding battery clusters, and the second terminals of the highest-level DC / DC converters are connected to the lowest-level DC / DC converters. The first ends of the DC converters are directly connected or connected through other DC / DC converters; therefore, the corresponding battery clusters are charged / discharged through DC / DC converters at all levels to achieve the SOC of each battery cluster Balanced, avoiding multiple switching of the relay, the SOC change rate of each battery cluster is consistent throughout the whole process, which can enable each battery cluster to achieve current sharing and improve the safety of the energy storage system.

Description

technical field [0001] The invention belongs to the technical field of energy storage batteries, and more specifically relates to an energy storage system and a current sharing method thereof. Background technique [0002] In traditional energy storage systems, individual battery clusters are connected in parallel. Since the internal resistance of each battery cluster is different, the current during the charging and discharging process is different, and the SOC change rate of different battery clusters is different. Therefore, each battery cluster in the energy storage system has a fixed SOC difference and cannot be fully charged. Unleash the maximum performance of the system. [0003] In the prior art, current sharing is realized by controlling the switching of each battery cluster. Among them, the dynamic method is: during the charging process of the energy storage system, if the charging current of the energy storage system is less than the preset value, each battery c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00H01M10/44
CPCH01M10/441H02J7/0014Y02E60/10
Inventor 牟建陶磊邵俊伟陶文玉崔德凯
Owner SUNGROW POWER SUPPLY CO LTD
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