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Energy storage system

An energy storage system and battery module technology, applied in the field of energy storage systems, can solve the problems of low cost, small size and weight

Active Publication Date: 2021-06-18
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, an object of the present invention is to propose an energy storage system, which can effectively solve the problem of parallel battery circulation, and has low cost, small volume and weight

Method used

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Embodiment Construction

[0041] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0042] In the description of the present invention, "plurality" means two or more.

[0043] The present invention is based on the discovery and recognition of the inventors of the present application to the following facts and problems:

[0044] In the related art, in order to solve the circulation problem of the energy storage system in which the battery modules are connected in parallel, two schemes are usually adopted, hereinafter referred to as the existing scheme 1 and the existing scheme 2.

[0045] Existing scheme 1: if figure ...

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Abstract

The invention discloses an energy storage system. The energy storage system comprises a bus; a plurality of battery modules which are connected to the bus in parallel, wherein the number of the battery modules is n; at least one power conversion module, wherein the number of the power conversion modules is n or n-1, and each power conversion module is connected with one battery module in series; and a controller which is used for controlling the power conversion modules according to the battery voltage and the battery current of the battery modules and the bus voltage of the bus, so that the sum of the voltages after the battery modules and the power conversion modules are connected in series is consistent with the bus voltage of the bus. The energy storage system according to the embodiment of the invention can effectively solve the problem of circulating current of the parallel batteries, and is low in cost, small in size and light in weight.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an energy storage system. Background technique [0002] With the rapid development of lithium battery and lithium battery energy storage technology, more and more lithium battery energy storage applications have emerged. Lithium battery modules (Pack) are generally implemented by connecting batteries in series and parallel. Lithium battery modules used in energy storage systems are generally implemented by connecting lithium battery modules in series or in parallel in order to obtain greater capacity. [0003] For the energy storage system 1' with battery modules connected in parallel, such as figure 1 As shown, as the working time of the energy storage system 1' prolongs, the parallel battery modules 10' will gradually show differences, and the addition or replacement of the battery modules 10' will be caused by the voltage difference of the battery modules 10'. The internal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H02J15/00H02J7/00
CPCH01M10/4207H01M10/425H02J15/00H02J7/0014H01M2010/4271Y02E60/10
Inventor 孙嘉品王营辉尹雪芹曹虎广红燕
Owner BYD CO LTD
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