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Energy storage system and control method for voltage difference among battery clusters

An energy storage battery and energy storage system technology, applied in battery circuit devices, arrangement of multiple synchronous batteries, charge equalization circuits, etc., can solve problems such as inability to operate battery clusters in parallel

Active Publication Date: 2018-07-27
BEIJING HYPERSTRONG TECH
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Problems solved by technology

[0005] The invention provides an energy storage system and a method for controlling the voltage difference between battery clusters, which solves the existing problem that the parallel operation of the battery clusters cannot be performed when the voltage difference between the battery clusters is large

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  • Energy storage system and control method for voltage difference among battery clusters
  • Energy storage system and control method for voltage difference among battery clusters
  • Energy storage system and control method for voltage difference among battery clusters

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Embodiment Construction

[0022] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatuses and methods consistent with aspects of the present disclosure as recited in the appended claims.

[0023] The terms "first", "second" and the like in the description and claims of the present invention and the drawings are used to distinguish different objects, rather than to describe a specific order. Furthermore, the terms "include" and "have", as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or de...

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Abstract

The invention provides an energy storage system and a control method for voltage difference among battery clusters. By the control method, the parallel process of the battery clusters can be rapidly and safely completed. The energy storage system comprises at least one battery cluster, a DC bus and a control unit, wherein each battery cluster comprises an energy storage battery and a high-voltagebox, the high-voltage box comprises a battery management system (BMS), a main positive contactor, a main negative contactor, a pre-charging contactor and a pre-charging resistor, and the control unitis connected with the BMS and is used for controlling the voltage difference so as to achieve parallel running of each battery cluster if the voltage difference between the battery cluster with highest voltage and the battery cluster with lowest voltage in the enabled battery clusters in the battery clusters is larger than a preset first threshold. In the energy storage system provided by the embodiment of the invention, different voltage differences among the battery clusters are classified and divided, the voltage difference of each battery cluster with relatively large voltage difference iscontrolled to actively balance the voltage difference among the battery clusters, so that parallel running of each battery cluster of the energy storage system is achieved as much as possible.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an energy storage system and a method for controlling the voltage difference between battery clusters. Background technique [0002] Lithium-ion batteries have the advantages of high cell voltage, large specific energy, and long cycle life. Therefore, lithium-ion batteries are gradually becoming the development trend of energy storage systems. The battery cluster is composed of multiple lithium-ion batteries connected in series and parallel. The purpose of series connection is to increase the battery terminal voltage, and the purpose of parallel connection is to increase the battery capacity. As a key component for storing and releasing electric energy, the battery cluster is the key equipment of the energy storage system, which directly affects the safe and stable operation of the energy storage system. [0003] Affected by the characteristics of lithium-ion batteries and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
CPCH02J7/0016
Inventor 刘骁卢久增陈冠儒高峰
Owner BEIJING HYPERSTRONG TECH
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