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Energy storage system and flow equalizing method thereof

An energy storage system and balanced current technology, which can be used in charge balancing circuits, secondary battery charging/discharging, electric vehicles, etc., can solve problems affecting the life of relays, avoid multiple switching, and improve safety.

Active Publication Date: 2020-03-24
SUNGROW POWER SUPPLY CO LTD
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  • 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 flow equalizing method thereof
  • Energy storage system and flow equalizing method thereof
  • Energy storage system and flow equalizing 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 invention provides an energy storage system and a current equalizing method thereof. The energy storage system comprises X current equalizing units and X battery clusters, wherein in each currentequalizing unit, the first end of the DC / DC converter at the uppermost stage is connected with the direct-current bus of the corresponding battery cluster; the second ends of the Y lowest-stage DC / DCconverters are respectively connected with the corresponding battery packs of the corresponding battery clusters, and the second end of the uppermost-stage DC / DC converter is directly connected with the first end of each lowest-stage DC / DC converter or is connected with the first end of each lowest-stage DC / DC converter through other stages of DC / DC converters; therefore, the corresponding batteryclusters are charged / discharged through each stage of DC / DC converter, so that SOC equalization of each battery cluster is realized, repeated switching of a relay is avoided, the SOC change rate of each battery cluster in the whole process is kept consistent, current equalization of each battery cluster can be realized, and the safety of an energy storage system is improved.

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 Applications(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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